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| author | (no author) <(no author)@138bc75d-0d04-0410-961f-82ee72b054a4> | 2000-04-19 02:29:16 +0000 |
|---|---|---|
| committer | (no author) <(no author)@138bc75d-0d04-0410-961f-82ee72b054a4> | 2000-04-19 02:29:16 +0000 |
| commit | 534a54dbc5b92206c4d874726e0566d736e24137 (patch) | |
| tree | 0ed60dfb46b894ef4abf8133d0971c2b8b35d12b | |
| parent | 4b6b3b3b1bad96c79817fa99d89b1f9b3551f181 (diff) | |
This commit was manufactured by cvs2svn to create tagGC_5_0_ALPHA_6
'GC_5_0_ALPHA_6'.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/tags/GC_5_0_ALPHA_6@33246 138bc75d-0d04-0410-961f-82ee72b054a4
53 files changed, 12301 insertions, 3487 deletions
diff --git a/boehm-gc/Makefile.am b/boehm-gc/Makefile.am deleted file mode 100644 index fba2c1f4745..00000000000 --- a/boehm-gc/Makefile.am +++ /dev/null @@ -1,128 +0,0 @@ -## Process this file with automake to produce Makefile.in. - -## FIXME: `make dist' in this directory will not currently work. 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Boehm, Alan J. Demers +Copyright (c) 1991-1996 by Xerox Corporation. All rights reserved. +Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved. +Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved. + +THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED +OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + +Permission is hereby granted to use or copy this program +for any purpose, provided the above notices are retained on all copies. +Permission to modify the code and to distribute modified code is granted, +provided the above notices are retained, and a notice that the code was +modified is included with the above copyright notice. + +This is version 5.0alpha6 of a conservative garbage collector for C and C++. + +You might find a more recent version of this at + +http://www.hpl.hp.com/personal/Hans_Boehm/gc + +HISTORY - + + Early versions of this collector were developed as a part of research +projects supported in part by the National Science Foundation +and the Defense Advance Research Projects Agency. +Much of the code was rewritten by Hans-J. Boehm (boehm@acm.org) at Xerox PARC +and at SGI. + +Some other contributors: + +More recent contributors are mentioned in the modification history at the +end of this file. My apologies for any omissions. + +The SPARC specific code was contributed by Mark Weiser +(weiser@parc.xerox.com). The Encore Multimax modifications were supplied by +Kevin Kenny (kenny@m.cs.uiuc.edu). The adaptation to the RT is largely due +to Vernon Lee (scorpion@rice.edu), on machines made available by IBM. +Much of the HP specific code and a number of good suggestions for improving the +generic code are due to Walter Underwood (wunder@hp-ses.sde.hp.com). +Robert Brazile (brazile@diamond.bbn.com) originally supplied the ULTRIX code. +Al Dosser (dosser@src.dec.com) and Regis Cridlig (Regis.Cridlig@cl.cam.ac.uk) +subsequently provided updates and information on variation between ULTRIX +systems. Parag Patel (parag@netcom.com) supplied the A/UX code. +Jesper Peterson(jep@mtiame.mtia.oz.au), Michel Schinz, and +Martin Tauchmann (martintauchmann@bigfoot.com) supplied the Amiga port. +Thomas Funke (thf@zelator.in-berlin.de(?)) and +Brian D.Carlstrom (bdc@clark.lcs.mit.edu) supplied the NeXT ports. +Douglas Steel (doug@wg.icl.co.uk) provided ICL DRS6000 code. +Bill Janssen (janssen@parc.xerox.com) supplied the SunOS dynamic loader +specific code. Manuel Serrano (serrano@cornas.inria.fr) supplied linux and +Sony News specific code. Al Dosser provided Alpha/OSF/1 code. He and +Dave Detlefs(detlefs@src.dec.com) also provided several generic bug fixes. +Alistair G. Crooks(agc@uts.amdahl.com) supplied the NetBSD and 386BSD ports. +Jeffrey Hsu (hsu@soda.berkeley.edu) provided the FreeBSD port. +Brent Benson (brent@jade.ssd.csd.harris.com) ported the collector to +a Motorola 88K processor running CX/UX (Harris NightHawk). +Ari Huttunen (Ari.Huttunen@hut.fi) generalized the OS/2 port to +nonIBM development environments (a nontrivial task). +Patrick Beard (beard@cs.ucdavis.edu) provided the initial MacOS port. +David Chase, then at Olivetti Research, suggested several improvements. +Scott Schwartz (schwartz@groucho.cse.psu.edu) supplied some of the +code to save and print call stacks for leak detection on a SPARC. +Jesse Hull and John Ellis supplied the C++ interface code. +Zhong Shao performed much of the experimentation that led to the +current typed allocation facility. (His dynamic type inference code hasn't +made it into the released version of the collector, yet.) +(Blame for misinstallation of these modifications goes to the first author, +however.) + +OVERVIEW + + This is intended to be a general purpose, garbage collecting storage +allocator. The algorithms used are described in: + +Boehm, H., and M. Weiser, "Garbage Collection in an Uncooperative Environment", +Software Practice & Experience, September 1988, pp. 807-820. + +Boehm, H., A. Demers, and S. Shenker, "Mostly Parallel Garbage Collection", +Proceedings of the ACM SIGPLAN '91 Conference on Programming Language Design +and Implementation, SIGPLAN Notices 26, 6 (June 1991), pp. 157-164. + +Boehm, H., "Space Efficient Conservative Garbage Collection", Proceedings +of the ACM SIGPLAN '91 Conference on Programming Language Design and +Implementation, SIGPLAN Notices 28, 6 (June 1993), pp. 197-206. + + Possible interactions between the collector and optimizing compilers are +discussed in + +Boehm, H., and D. Chase, "A Proposal for GC-safe C Compilation", +The Journal of C Language Translation 4, 2 (December 1992). + +and + +Boehm H., "Simple GC-safe Compilation", Proceedings +of the ACM SIGPLAN '96 Conference on Programming Language Design and +Implementation. + +(Both are also available from +http://reality.sgi.com/boehm/papers/, among other places.) + + Unlike the collector described in the second reference, this collector +operates either with the mutator stopped during the entire collection +(default) or incrementally during allocations. (The latter is supported +on only a few machines.) It does not rely on threads, but is intended +to be thread-safe. + + Some of the ideas underlying the collector have previously been explored +by others. (Doug McIlroy wrote a vaguely similar collector that is part of +version 8 UNIX (tm).) However none of this work appears to have been widely +disseminated. + + Rudimentary tools for use of the collector as a leak detector are included, as +is a fairly sophisticated string package "cord" that makes use of the collector. +(See cord/README.) + + +GENERAL DESCRIPTION + + This is a garbage collecting storage allocator that is intended to be +used as a plug-in replacement for C's malloc. + + Since the collector does not require pointers to be tagged, it does not +attempt to ensure that all inaccessible storage is reclaimed. However, +in our experience, it is typically more successful at reclaiming unused +memory than most C programs using explicit deallocation. Unlike manually +introduced leaks, the amount of unreclaimed memory typically stays +bounded. + + In the following, an "object" is defined to be a region of memory allocated +by the routines described below. + + Any objects not intended to be collected must be pointed to either +from other such accessible objects, or from the registers, +stack, data, or statically allocated bss segments. Pointers from +the stack or registers may point to anywhere inside an object. +The same is true for heap pointers if the collector is compiled with + ALL_INTERIOR_POINTERS defined, as is now the default. + +Compiling without ALL_INTERIOR_POINTERS may reduce accidental retention +of garbage objects, by requiring pointers from the heap to to the beginning +of an object. But this no longer appears to be a significant +issue for most programs. + +There are a number of routines which modify the pointer recognition +algorithm. GC_register_displacement allows certain interior pointers +to be recognized even if ALL_INTERIOR_POINTERS is nor defined. +GC_malloc_ignore_off_page allows some pointers into the middle of large objects +to be disregarded, greatly reducing the probablility of accidental +retention of large objects. For most purposes it seems best to compile +with ALL_INTERIOR_POINTERS and to use GC_malloc_ignore_off_page if +you get collector warnings from allocations of very large objects. +See README.debugging for details. + + Note that pointers inside memory allocated by the standard "malloc" are not +seen by the garbage collector. Thus objects pointed to only from such a +region may be prematurely deallocated. It is thus suggested that the +standard "malloc" be used only for memory regions, such as I/O buffers, that +are guaranteed not to contain pointers to garbage collectable memory. +Pointers in C language automatic, static, or register variables, +are correctly recognized. (Note that GC_malloc_uncollectable has semantics +similar to standard malloc, but allocates objects that are traced by the +collector.) + + The collector does not always know how to find pointers in data +areas that are associated with dynamic libraries. This is easy to +remedy IF you know how to find those data areas on your operating +system (see GC_add_roots). Code for doing this under SunOS, IRIX 5.X and 6.X, +HP/UX, Alpha OSF/1, Linux, and win32 is included and used by default. (See +README.win32 for win32 details.) On other systems pointers from dynamic +library data areas may not be considered by the collector. + + Note that the garbage collector does not need to be informed of shared +read-only data. However if the shared library mechanism can introduce +discontiguous data areas that may contain pointers, then the collector does +need to be informed. + + Signal processing for most signals may be deferred during collection, +and during uninterruptible parts of the allocation process. Unlike +standard ANSI C mallocs, it can be safe to invoke malloc +from a signal handler while another malloc is in progress, provided +the original malloc is not restarted. (Empirically, many UNIX +applications already assume this.) To obtain this level of signal +safety, remove the definition of -DNO_SIGNALS in Makefile. This incurs +a minor performance penalty, and hence is no longer the default. + + The allocator/collector can also be configured for thread-safe operation. +(Full signal safety can also be achieved, but only at the cost of two system +calls per malloc, which is usually unacceptable.) + +INSTALLATION AND PORTABILITY + + As distributed, the macro SILENT is defined in Makefile. +In the event of problems, this can be removed to obtain a moderate +amount of descriptive output for each collection. +(The given statistics exhibit a few peculiarities. +Things don't appear to add up for a variety of reasons, most notably +fragmentation losses. These are probably much more significant for the +contrived program "test.c" than for your application.) + + Note that typing "make test" will automatically build the collector +and then run setjmp_test and gctest. Setjmp_test will give you information +about configuring the collector, which is useful primarily if you have +a machine that's not already supported. Gctest is a somewhat superficial +test of collector functionality. Failure is indicated by a core dump or +a message to the effect that the collector is broken. Gctest takes about +35 seconds to run on a SPARCstation 2. On a slower machine, +expect it to take a while. It may use up to 8 MB of memory. (The +multi-threaded version will use more.) "Make test" will also, as +its last step, attempt to build and test the "cord" string library. +This will fail without an ANSI C compiler. + + The Makefile will generate a library gc.a which you should link against. +Typing "make cords" will add the cord library to gc.a. +Note that this requires an ANSI C compiler. + + It is suggested that if you need to replace a piece of the collector +(e.g. GC_mark_rts.c) you simply list your version ahead of gc.a on the + work.) +ld command line, rather than replacing the one in gc.a. (This will +generate numerous warnings under some versions of AIX, but it still +works.) + + All include files that need to be used by clients will be put in the +include subdirectory. (Normally this is just gc.h. "Make cords" adds +"cord.h" and "ec.h".) + + The collector currently is designed to run essentially unmodified on +machines that use a flat 32-bit or 64-bit address space. +That includes the vast majority of Workstations and X86 (X >= 3) PCs. +(The list here was deleted because it was getting too long and constantly +out of date.) + It does NOT run under plain 16-bit DOS or Windows 3.X. There are however +various packages (e.g. win32s, djgpp) that allow flat 32-bit address +applications to run under those systemsif the have at least an 80386 processor, +and several of those are compatible with the collector. + + In a few cases (Amiga, OS/2, Win32, MacOS) a separate makefile +or equivalent is supplied. Many of these have separate README.system +files. + + Dynamic libraries are completely supported only under SunOS +(and even that support is not functional on the last Sun 3 release), +IRIX 5&6, HP-PA, Win32 (not Win32S) and OSF/1 on DEC AXP machines. +On other machines we recommend that you do one of the following: + + 1) Add dynamic library support (and send us the code). + 2) Use static versions of the libraries. + 3) Arrange for dynamic libraries to use the standard malloc. + This is still dangerous if the library stores a pointer to a + garbage collected object. But nearly all standard interfaces + prohibit this, because they deal correctly with pointers + to stack allocated objects. (Strtok is an exception. Don't + use it.) + + In all cases we assume that pointer alignment is consistent with that +enforced by the standard C compilers. If you use a nonstandard compiler +you may have to adjust the alignment parameters defined in gc_priv.h. + + A port to a machine that is not byte addressed, or does not use 32 bit +or 64 bit addresses will require a major effort. A port to plain MSDOS +or win16 is hard. + + For machines not already mentioned, or for nonstandard compilers, the +following are likely to require change: + +1. The parameters in gcconfig.h. + The parameters that will usually require adjustment are + STACKBOTTOM, ALIGNMENT and DATASTART. Setjmp_test + prints its guesses of the first two. + DATASTART should be an expression for computing the + address of the beginning of the data segment. This can often be + &etext. But some memory management units require that there be + some unmapped space between the text and the data segment. Thus + it may be more complicated. On UNIX systems, this is rarely + documented. But the adb "$m" command may be helpful. (Note + that DATASTART will usually be a function of &etext. Thus a + single experiment is usually insufficient.) + STACKBOTTOM is used to initialize GC_stackbottom, which + should be a sufficient approximation to the coldest stack address. + On some machines, it is difficult to obtain such a value that is + valid across a variety of MMUs, OS releases, etc. A number of + alternatives exist for using the collector in spite of this. See the + discussion in gcconfig.h immediately preceding the various + definitions of STACKBOTTOM. + +2. mach_dep.c. + The most important routine here is one to mark from registers. + The distributed file includes a generic hack (based on setjmp) that + happens to work on many machines, and may work on yours. Try + compiling and running setjmp_t.c to see whether it has a chance of + working. (This is not correct C, so don't blame your compiler if it + doesn't work. Based on limited experience, register window machines + are likely to cause trouble. If your version of setjmp claims that + all accessible variables, including registers, have the value they + had at the time of the longjmp, it also will not work. Vanilla 4.2 BSD + on Vaxen makes such a claim. SunOS does not.) + If your compiler does not allow in-line assembly code, or if you prefer + not to use such a facility, mach_dep.c may be replaced by a .s file + (as we did for the MIPS machine and the PC/RT). + At this point enough architectures are supported by mach_dep.c + that you will rarely need to do more than adjust for assembler + syntax. + +3. os_dep.c (and gc_priv.h). + Several kinds of operating system dependent routines reside here. + Many are optional. Several are invoked only through corresponding + macros in gc_priv.h, which may also be redefined as appropriate. + The routine GC_register_data_segments is crucial. It registers static + data areas that must be traversed by the collector. (User calls to + GC_add_roots may sometimes be used for similar effect.) + Routines to obtain memory from the OS also reside here. + Alternatively this can be done entirely by the macro GET_MEM + defined in gc_priv.h. Routines to disable and reenable signals + also reside here if they are need by the macros DISABLE_SIGNALS + and ENABLE_SIGNALS defined in gc_priv.h. + In a multithreaded environment, the macros LOCK and UNLOCK + in gc_priv.h will need to be suitably redefined. + The incremental collector requires page dirty information, which + is acquired through routines defined in os_dep.c. Unless directed + otherwise by gcconfig.h, these are implemented as stubs that simply + treat all pages as dirty. (This of course makes the incremental + collector much less useful.) + +4. dyn_load.c + This provides a routine that allows the collector to scan data + segments associated with dynamic libraries. Often it is not + necessary to provide this routine unless user-written dynamic + libraries are used. + + For a different version of UN*X or different machines using the +Motorola 68000, Vax, SPARC, 80386, NS 32000, PC/RT, or MIPS architecture, +it should frequently suffice to change definitions in gcconfig.h. + + +THE C INTERFACE TO THE ALLOCATOR + + The following routines are intended to be directly called by the user. +Note that usually only GC_malloc is necessary. GC_clear_roots and GC_add_roots +calls may be required if the collector has to trace from nonstandard places +(e.g. from dynamic library data areas on a machine on which the +collector doesn't already understand them.) On some machines, it may +be desirable to set GC_stacktop to a good approximation of the stack base. +(This enhances code portability on HP PA machines, since there is no +good way for the collector to compute this value.) Client code may include +"gc.h", which defines all of the following, plus many others. + +1) GC_malloc(nbytes) + - allocate an object of size nbytes. Unlike malloc, the object is + cleared before being returned to the user. Gc_malloc will + invoke the garbage collector when it determines this to be appropriate. + GC_malloc may return 0 if it is unable to acquire sufficient + space from the operating system. This is the most probable + consequence of running out of space. Other possible consequences + are that a function call will fail due to lack of stack space, + or that the collector will fail in other ways because it cannot + maintain its internal data structures, or that a crucial system + process will fail and take down the machine. Most of these + possibilities are independent of the malloc implementation. + +2) GC_malloc_atomic(nbytes) + - allocate an object of size nbytes that is guaranteed not to contain any + pointers. The returned object is not guaranteed to be cleared. + (Can always be replaced by GC_malloc, but results in faster collection + times. The collector will probably run faster if large character + arrays, etc. are allocated with GC_malloc_atomic than if they are + statically allocated.) + +3) GC_realloc(object, new_size) + - change the size of object to be new_size. Returns a pointer to the + new object, which may, or may not, be the same as the pointer to + the old object. The new object is taken to be atomic iff the old one + was. If the new object is composite and larger than the original object, + then the newly added bytes are cleared (we hope). This is very likely + to allocate a new object, unless MERGE_SIZES is defined in gc_priv.h. + Even then, it is likely to recycle the old object only if the object + is grown in small additive increments (which, we claim, is generally bad + coding practice.) + +4) GC_free(object) + - explicitly deallocate an object returned by GC_malloc or + GC_malloc_atomic. Not necessary, but can be used to minimize + collections if performance is critical. Probably a performance + loss for very small objects (<= 8 bytes). + +5) GC_expand_hp(bytes) + - Explicitly increase the heap size. (This is normally done automatically + if a garbage collection failed to GC_reclaim enough memory. Explicit + calls to GC_expand_hp may prevent unnecessarily frequent collections at + program startup.) + +6) GC_malloc_ignore_off_page(bytes) + - identical to GC_malloc, but the client promises to keep a pointer to + the somewhere within the first 256 bytes of the object while it is + live. (This pointer should nortmally be declared volatile to prevent + interference from compiler optimizations.) This is the recommended + way to allocate anything that is likely to be larger than 100Kbytes + or so. (GC_malloc may result in failure to reclaim such objects.) + +7) GC_set_warn_proc(proc) + - Can be used to redirect warnings from the collector. Such warnings + should be rare, and should not be ignored during code development. + +8) GC_enable_incremental() + - Enables generational and incremental collection. Useful for large + heaps on machines that provide access to page dirty information. + Some dirty bit implementations may interfere with debugging + (by catching address faults) and place restrictions on heap arguments + to system calls (since write faults inside a system call may not be + handled well). + +9) Several routines to allow for registration of finalization code. + User supplied finalization code may be invoked when an object becomes + unreachable. To call (*f)(obj, x) when obj becomes inaccessible, use + GC_register_finalizer(obj, f, x, 0, 0); + For more sophisticated uses, and for finalization ordering issues, + see gc.h. + + The global variable GC_free_space_divisor may be adjusted up from its +default value of 4 to use less space and more collection time, or down for +the opposite effect. Setting it to 1 or 0 will effectively disable collections +and cause all allocations to simply grow the heap. + + The variable GC_non_gc_bytes, which is normally 0, may be changed to reflect +the amount of memory allocated by the above routines that should not be +considered as a candidate for collection. Careless use may, of course, result +in excessive memory consumption. + + Some additional tuning is possible through the parameters defined +near the top of gc_priv.h. + + If only GC_malloc is intended to be used, it might be appropriate to define: + +#define malloc(n) GC_malloc(n) +#define calloc(m,n) GC_malloc((m)*(n)) + + For small pieces of VERY allocation intensive code, gc_inl.h +includes some allocation macros that may be used in place of GC_malloc +and friends. + + All externally visible names in the garbage collector start with "GC_". +To avoid name conflicts, client code should avoid this prefix, except when +accessing garbage collector routines or variables. + + There are provisions for allocation with explicit type information. +This is rarely necessary. Details can be found in gc_typed.h. + +THE C++ INTERFACE TO THE ALLOCATOR: + + The Ellis-Hull C++ interface to the collector is included in +the collector distribution. If you intend to use this, type +"make c++" after the initial build of the collector is complete. +See gc_cpp.h for the definition of the interface. This interface +tries to approximate the Ellis-Detlefs C++ garbage collection +proposal without compiler changes. + +Cautions: +1. Arrays allocated without new placement syntax are +allocated as uncollectable objects. They are traced by the +collector, but will not be reclaimed. + +2. Failure to use "make c++" in combination with (1) will +result in arrays allocated using the default new operator. +This is likely to result in disaster without linker warnings. + +3. If your compiler supports an overloaded new[] operator, +then gc_cpp.cc and gc_cpp.h should be suitably modified. + +4. Many current C++ compilers have deficiencies that +break some of the functionality. See the comments in gc_cpp.h +for suggested workarounds. + +USE AS LEAK DETECTOR: + + The collector may be used to track down leaks in C programs that are +intended to run with malloc/free (e.g. code with extreme real-time or +portability constraints). To do so define FIND_LEAK in Makefile +This will cause the collector to invoke the report_leak +routine defined near the top of reclaim.c whenever an inaccessible +object is found that has not been explicitly freed. The collector will +no longer reclaim inaccessible memory; in this form it is purely a +debugging tool. + Productive use of this facility normally involves redefining report_leak +to do something more intelligent. This typically requires annotating +objects with additional information (e.g. creation time stack trace) that +identifies their origin. Such code is typically not very portable, and is +not included here, except on SPARC machines. + If all objects are allocated with GC_DEBUG_MALLOC (see next section), +then the default version of report_leak will report the source file +and line number at which the leaked object was allocated. This may +sometimes be sufficient. (On SPARC/SUNOS4 machines, it will also report +a cryptic stack trace. This can often be turned into a sympolic stack +trace by invoking program "foo" with "callprocs foo". Callprocs is +a short shell script that invokes adb to expand program counter values +to symbolic addresses. It was largely supplied by Scott Schwartz.) + Note that the debugging facilities described in the next section can +sometimes be slightly LESS effective in leak finding mode, since in +leak finding mode, GC_debug_free actually results in reuse of the object. +(Otherwise the object is simply marked invalid.) Also note that the test +program is not designed to run meaningfully in FIND_LEAK mode. +Use "make gc.a" to build the collector. + +DEBUGGING FACILITIES: + + The routines GC_debug_malloc, GC_debug_malloc_atomic, GC_debug_realloc, +and GC_debug_free provide an alternate interface to the collector, which +provides some help with memory overwrite errors, and the like. +Objects allocated in this way are annotated with additional +information. Some of this information is checked during garbage +collections, and detected inconsistencies are reported to stderr. + + Simple cases of writing past the end of an allocated object should +be caught if the object is explicitly deallocated, or if the +collector is invoked while the object is live. The first deallocation +of an object will clear the debugging info associated with an +object, so accidentally repeated calls to GC_debug_free will report the +deallocation of an object without debugging information. Out of +memory errors will be reported to stderr, in addition to returning +NIL. + + GC_debug_malloc checking during garbage collection is enabled +with the first call to GC_debug_malloc. This will result in some +slowdown during collections. If frequent heap checks are desired, +this can be achieved by explicitly invoking GC_gcollect, e.g. from +the debugger. + + GC_debug_malloc allocated objects should not be passed to GC_realloc +or GC_free, and conversely. It is however acceptable to allocate only +some objects with GC_debug_malloc, and to use GC_malloc for other objects, +provided the two pools are kept distinct. In this case, there is a very +low probablility that GC_malloc allocated objects may be misidentified as +having been overwritten. This should happen with probability at most +one in 2**32. This probability is zero if GC_debug_malloc is never called. + + GC_debug_malloc, GC_malloc_atomic, and GC_debug_realloc take two +additional trailing arguments, a string and an integer. These are not +interpreted by the allocator. They are stored in the object (the string is +not copied). If an error involving the object is detected, they are printed. + + The macros GC_MALLOC, GC_MALLOC_ATOMIC, GC_REALLOC, GC_FREE, and +GC_REGISTER_FINALIZER are also provided. These require the same arguments +as the corresponding (nondebugging) routines. If gc.h is included +with GC_DEBUG defined, they call the debugging versions of these +functions, passing the current file name and line number as the two +extra arguments, where appropriate. If gc.h is included without GC_DEBUG +defined, then all these macros will instead be defined to their nondebugging +equivalents. (GC_REGISTER_FINALIZER is necessary, since pointers to +objects with debugging information are really pointers to a displacement +of 16 bytes form the object beginning, and some translation is necessary +when finalization routines are invoked. For details, about what's stored +in the header, see the definition of the type oh in debug_malloc.c) + +INCREMENTAL/GENERATIONAL COLLECTION: + +The collector normally interrupts client code for the duration of +a garbage collection mark phase. This may be unacceptable if interactive +response is needed for programs with large heaps. The collector +can also run in a "generational" mode, in which it usually attempts to +collect only objects allocated since the last garbage collection. +Furthermore, in this mode, garbage collections run mostly incrementally, +with a small amount of work performed in response to each of a large number of +GC_malloc requests. + +This mode is enabled by a call to GC_enable_incremental(). + +Incremental and generational collection is effective in reducing +pause times only if the collector has some way to tell which objects +or pages have been recently modified. The collector uses two sources +of information: + +1. Information provided by the VM system. This may be provided in +one of several forms. Under Solaris 2.X (and potentially under other +similar systems) information on dirty pages can be read from the +/proc file system. Under other systems (currently SunOS4.X) it is +possible to write-protect the heap, and catch the resulting faults. +On these systems we require that system calls writing to the heap +(other than read) be handled specially by client code. +See os_dep.c for details. + +2. Information supplied by the programmer. We define "stubborn" +objects to be objects that are rarely changed. Such an object +can be allocated (and enabled for writing) with GC_malloc_stubborn. +Once it has been initialized, the collector should be informed with +a call to GC_end_stubborn_change. Subsequent writes that store +pointers into the object must be preceded by a call to +GC_change_stubborn. + +This mechanism performs best for objects that are written only for +initialization, and such that only one stubborn object is writable +at once. It is typically not worth using for short-lived +objects. Stubborn objects are treated less efficiently than pointerfree +(atomic) objects. + +A rough rule of thumb is that, in the absence of VM information, garbage +collection pauses are proportional to the amount of pointerful storage +plus the amount of modified "stubborn" storage that is reachable during +the collection. + +Initial allocation of stubborn objects takes longer than allocation +of other objects, since other data structures need to be maintained. + +We recommend against random use of stubborn objects in client +code, since bugs caused by inappropriate writes to stubborn objects +are likely to be very infrequently observed and hard to trace. +However, their use may be appropriate in a few carefully written +library routines that do not make the objects themselves available +for writing by client code. + + +BUGS: + + Any memory that does not have a recognizable pointer to it will be +reclaimed. Exclusive-or'ing forward and backward links in a list +doesn't cut it. + Some C optimizers may lose the last undisguised pointer to a memory +object as a consequence of clever optimizations. This has almost +never been observed in practice. Send mail to boehm@acm.org +for suggestions on how to fix your compiler. + This is not a real-time collector. In the standard configuration, +percentage of time required for collection should be constant across +heap sizes. But collection pauses will increase for larger heaps. +(On SPARCstation 2s collection times will be on the order of 300 msecs +per MB of accessible memory that needs to be scanned. Your mileage +may vary.) The incremental/generational collection facility helps, +but is portable only if "stubborn" allocation is used. + Please address bug reports to boehm@acm.org. If you are +contemplating a major addition, you might also send mail to ask whether +it's already been done (or whether we tried and discarded it). + +RECENT VERSIONS: + + Version 1.3 and immediately preceding versions contained spurious +assembly language assignments to TMP_SP. Only the assignment in the PC/RT +code is necessary. On other machines, with certain compiler options, +the assignments can lead to an unsaved register being overwritten. +Known to cause problems under SunOS 3.5 WITHOUT the -O option. (With +-O the compiler recognizes it as dead code. It probably shouldn't, +but that's another story.) + + Version 1.4 and earlier versions used compile time determined values +for the stack base. This no longer works on Sun 3s, since Sun 3/80s use +a different stack base. We now use a straightforward heuristic on all +machines on which it is known to work (incl. Sun 3s) and compile-time +determined values for the rest. There should really be library calls +to determine such values. + + Version 1.5 and earlier did not ensure 8 byte alignment for objects +allocated on a sparc based machine. + + Version 1.8 added ULTRIX support in gc_private.h. + + Version 1.9 fixed a major bug in gc_realloc. + + Version 2.0 introduced a consistent naming convention for collector +routines and added support for registering dynamic library data segments +in the standard mark_roots.c. Most of the data structures were revamped. +The treatment of interior pointers was completely changed. Finalization +was added. Support for locking was added. Object kinds were added. +We added a black listing facility to avoid allocating at addresses known +to occur as integers somewhere in the address space. Much of this +was accomplished by adapting ideas and code from the PCR collector. +The test program was changed and expanded. + + Version 2.1 was the first stable version since 1.9, and added support +for PPCR. + + Version 2.2 added debugging allocation, and fixed various bugs. Among them: +- GC_realloc could fail to extend the size of the object for certain large object sizes. +- A blatant subscript range error in GC_printf, which unfortunately + wasn't exercised on machines with sufficient stack alignment constraints. +- GC_register_displacement did the wrong thing if it was called after + any allocation had taken place. +- The leak finding code would eventually break after 2048 byte + byte objects leaked. +- interface.c didn't compile. +- The heap size remained much too small for large stacks. +- The stack clearing code behaved badly for large stacks, and perhaps + on HP/PA machines. + + Version 2.3 added ALL_INTERIOR_POINTERS and fixed the following bugs: +- Missing declaration of etext in the A/UX version. +- Some PCR root-finding problems. +- Blacklisting was not 100% effective, because the plausible future + heap bounds were being miscalculated. +- GC_realloc didn't handle out-of-memory correctly. +- GC_base could return a nonzero value for addresses inside free blocks. +- test.c wasn't really thread safe, and could erroneously report failure + in a multithreaded environment. (The locking primitives need to be + replaced for other threads packages.) +- GC_CONS was thoroughly broken. +- On a SPARC with dynamic linking, signals stayed diabled while the + client code was running. + (Thanks to Manuel Serrano at INRIA for reporting the last two.) + + Version 2.4 added GC_free_space_divisor as a tuning knob, added + support for OS/2 and linux, and fixed the following bugs: +- On machines with unaligned pointers (e.g. Sun 3), every 128th word could + fail to be considered for marking. +- Dynamic_load.c erroneously added 4 bytes to the length of the data and + bss sections of the dynamic library. This could result in a bad memory + reference if the actual length was a multiple of a page. (Observed on + Sun 3. Can probably also happen on a Sun 4.) + (Thanks to Robert Brazile for pointing out that the Sun 3 version + was broken. Dynamic library handling is still broken on Sun 3s + under 4.1.1U1, but apparently not 4.1.1. If you have such a machine, + use -Bstatic.) + + Version 2.5 fixed the following bugs: +- Removed an explicit call to exit(1) +- Fixed calls to GC_printf and GC_err_printf, so the correct number of + arguments are always supplied. The OS/2 C compiler gets confused if + the number of actuals and the number of formals differ. (ANSI C + doesn't require this to work. The ANSI sanctioned way of doing things + causes too many compatibility problems.) + + Version 3.0 added generational/incremental collection and stubborn + objects. + + Version 3.1 added the following features: +- A workaround for a SunOS 4.X SPARC C compiler + misfeature that caused problems when the collector was turned into + a dynamic library. +- A fix for a bug in GC_base that could result in a memory fault. +- A fix for a performance bug (and several other misfeatures) pointed + out by Dave Detlefs and Al Dosser. +- Use of dirty bit information for static data under Solaris 2.X. +- DEC Alpha/OSF1 support (thanks to Al Dosser). +- Incremental collection on more platforms. +- A more refined heap expansion policy. Less space usage by default. +- Various minor enhancements to reduce space usage, and to reduce + the amount of memory scanned by the collector. +- Uncollectable allocation without per object overhead. +- More conscientious handling of out-of-memory conditions. +- Fixed a bug in debugging stubborn allocation. +- Fixed a bug that resulted in occasional erroneous reporting of smashed + objects with debugging allocation. +- Fixed bogus leak reports of size 4096 blocks with FIND_LEAK. + + Version 3.2 fixed a serious and not entirely repeatable bug in + the incremental collector. It appeared only when dirty bit info + on the roots was available, which is normally only under Solaris. + It also added GC_general_register_disappearing_link, and some + testing code. Interface.c disappeared. + + Version 3.3 fixes several bugs and adds new ports: +- PCR-specific bugs. +- Missing locking in GC_free, redundant FASTUNLOCK + in GC_malloc_stubborn, and 2 bugs in + GC_unregister_disappearing_link. + All of the above were pointed out by Neil Sharman + (neil@cs.mu.oz.au). +- Common symbols allocated by the SunOS4.X dynamic loader + were not included in the root set. +- Bug in GC_finalize (reported by Brian Beuning and Al Dosser) +- Merged Amiga port from Jesper Peterson (untested) +- Merged NeXT port from Thomas Funke (significantly + modified and untested) + + Version 3.4: +- Fixed a performance bug in GC_realloc. +- Updated the amiga port. +- Added NetBSD and 386BSD ports. +- Added cord library. +- Added trivial performance enhancement for + ALL_INTERIOR_POINTERS. (Don't scan last word.) + + Version 3.5 +- Minor collections now mark from roots only once, if that + doesn't cause an excessive pause. +- The stack clearing heuristic was refined to prevent anomalies + with very heavily recursive programs and sparse stacks. +- Fixed a bug that prevented mark stack growth in some cases. + GC_objects_are_marked should be set to TRUE after a call + to GC_push_roots and as part of GC_push_marked, since + both can now set mark bits. I think this is only a performance + bug, but I wouldn't bet on it. It's certainly very hard to argue + that the old version was correct. +- Fixed an incremental collection bug that prevented it from + working at all when HBLKSIZE != getpagesize() +- Changed dynamic_loading.c to include gc_priv.h before testing + DYNAMIC_LOADING. SunOS dynamic library scanning + must have been broken in 3.4. +- Object size rounding now adapts to program behavior. +- Added a workaround (provided by Manuel Serrano and + colleagues) to a long-standing SunOS 4.X (and 3.X?) ld bug + that I had incorrectly assumed to have been squished. + The collector was broken if the text segment size was within + 32 bytes of a multiple of 8K bytes, and if the beginning of + the data segment contained interesting roots. The workaround + assumes a demand-loadable executable. The original may have + have "worked" in some other cases. +- Added dynamic library support under IRIX5. +- Added support for EMX under OS/2 (thanks to Ari Huttunen). + +Version 3.6: +- fixed a bug in the mark stack growth code that was introduced + in 3.4. +- fixed Makefile to work around DEC AXP compiler tail recursion + bug. + +Version 3.7: +- Added a workaround for an HP/UX compiler bug. +- Fixed another stack clearing performance bug. Reworked + that code once more. + +Version 4.0: +- Added support for Solaris threads (which was possible + only by reimplementing some fraction of Solaris threads, + since Sun doesn't currently make the thread debugging + interface available). +- Added non-threads win32 and win32S support. +- (Grudgingly, with suitable muttering of obscenities) renamed + files so that the collector distribution could live on a FAT + file system. Files that are guaranteed to be useless on + a PC still have long names. Gc_inline.h and gc_private.h + still exist, but now just include gc_inl.h and gc_priv.h. +- Fixed a really obscure bug in finalization that could cause + undetected mark stack overflows. (I would be surprised if + any real code ever tickled this one.) +- Changed finalization code to dynamically resize the hash + tables it maintains. (This probably does not matter for well- + -written code. It no doubt does for C++ code that overuses + destructors.) +- Added typed allocation primitives. Rewrote the marker to + accommodate them with more reasonable efficiency. This + change should also speed up marking for GC_malloc allocated + objects a little. See gc_typed.h for new primitives. +- Improved debugging facilities slightly. Allocation time + stack traces are now kept by default on SPARC/SUNOS4. + (Thanks to Scott Schwartz.) +- Added better support for small heap applications. +- Significantly extended cord package. Fixed a bug in the + implementation of lazily read files. Printf and friends now + have cord variants. Cord traversals are a bit faster. +- Made ALL_INTERIOR_POINTERS recognition the default. +- Fixed de so that it can run in constant space, independent + of file size. Added simple string searching to cords and de. +- Added the Hull-Ellis C++ interface. +- Added dynamic library support for OSF/1. + (Thanks to Al Dosser and Tim Bingham at DEC.) +- Changed argument to GC_expand_hp to be expressed + in units of bytes instead of heap blocks. (Necessary + since the heap block size now varies depending on + configuration. The old version was never very clean.) +- Added GC_get_heap_size(). The previous "equivalent" + was broken. +- Restructured the Makefile a bit. + +Since version 4.0: +- Changed finalization implementation to guarantee that + finalization procedures are called outside of the allocation + lock, making direct use of the interface a little less dangerous. + MAY BREAK EXISTING CLIENTS that assume finalizers + are protected by a lock. Since there seem to be few multithreaded + clients that use finalization, this is hopefully not much of + a problem. +- Fixed a gross bug in CORD_prev. +- Fixed a bug in blacklst.c that could result in unbounded + heap growth during startup on machines that do not clear + memory obtained from the OS (e.g. win32S). +- Ported de editor to win32/win32S. (This is now the only + version with a mouse-sensitive UI.) +- Added GC_malloc_ignore_off_page to allocate large arrays + in the presence of ALL_INTERIOR_POINTERS. +- Changed GC_call_with_alloc_lock to not disable signals in + the single-threaded case. +- Reduced retry count in GC_collect_or_expand for garbage + collecting when out of memory. +- Made uncollectable allocations bypass black-listing, as they + should. +- Fixed a bug in typed_test in test.c that could cause (legitimate) + GC crashes. +- Fixed some potential synchronization problems in finalize.c +- Fixed a real locking problem in typd_mlc.c. +- Worked around an AIX 3.2 compiler feature that results in + out of bounds memory references. +- Partially worked around an IRIX5.2 beta problem (which may + or may not persist to the final release). +- Fixed a bug in the heap integrity checking code that could + result in explicitly deallocated objects being identified as + smashed. Fixed a bug in the dbg_mlc stack saving code + that caused old argument pointers to be considered live. +- Fixed a bug in CORD_ncmp (and hence CORD_str). +- Repaired the OS2 port, which had suffered from bit rot + in 4.0. Worked around what appears to be CSet/2 V1.0 + optimizer bug. +- Fixed a Makefile bug for target "c++". + +Since version 4.1: +- Multiple bug fixes/workarounds in the Solaris threads version. + (It occasionally failed to locate some register contents for + marking. It also turns out that thr_suspend and friends are + unreliable in Solaris 2.3. Dirty bit reads appear + to be unreliable under some weird + circumstances. My stack marking code + contained a serious performance bug. The new code is + extremely defensive, and has not failed in several cpu + hours of testing. But no guarantees ...) +- Added MacOS support (thanks to Patrick Beard.) +- Fixed several syntactic bugs in gc_c++.h and friends. (These + didn't bother g++, but did bother most other compilers.) + Fixed gc_c++.h finalization interface. (It didn't.) +- 64 bit alignment for allocated objects was not guaranteed in a + few cases in which it should have been. +- Added GC_malloc_atomic_ignore_off_page. +- Added GC_collect_a_little. +- Added some prototypes to gc.h. +- Some other minor bug fixes (notably in Makefile). +- Fixed OS/2 / EMX port (thanks to Ari Huttunen). +- Fixed AmigaDOS port. (thanks to Michel Schinz). +- Fixed the DATASTART definition under Solaris. There + was a 1 in 16K chance of the collector missing the first + 64K of static data (and thus crashing). +- Fixed some blatant anachronisms in the README file. +- Fixed PCR-Makefile for upcoming PPCR release. + +Since version 4.2: +- Fixed SPARC alignment problem with GC_DEBUG. +- Fixed Solaris threads /proc workaround. The real + problem was an interaction with mprotect. +- Incorporated fix from Patrick Beard for gc_c++.h (now gc_cpp.h). +- Slightly improved allocator space utilization by + fixing the GC_size_map mechanism. +- Integrated some Sony News and MIPS RISCos 4.51 + patches. (Thanks to Nobuyuki Hikichi of + Software Research Associates, Inc. Japan) +- Fixed HP_PA alignment problem. (Thanks to + xjam@cork.cs.berkeley.edu.) +- Added GC_same_obj and friends. Changed GC_base + to return 0 for pointers past the end of large objects. + Improved GC_base performance with ALL_INTERIOR_POINTERS + on machines with a slow integer mod operation. + Added GC_PTR_ADD, GC_PTR_STORE, etc. to prepare + for preprocessor. +- changed the default on most UNIX machines to be that + signals are not disabled during critical GC operations. + This is still ANSI-conforming, though somewhat dangerous + in the presence of signal handlers. But the performance + cost of the alternative is sometimes problematic. + Can be changed back with a minor Makefile edit. +- renamed IS_STRING in gc.h, to CORD_IS_STRING, thus + following my own naming convention. Added the function + CORD_to_const_char_star. +- Fixed a gross bug in GC_finalize. Symptom: occasional + address faults in that function. (Thanks to Anselm + Baird-Smith (Anselm.BairdSmith@inria.fr) +- Added port to ICL DRS6000 running DRS/NX. Restructured + things a bit to factor out common code, and remove obsolete + code. Collector should now run under SUNOS5 with either + mprotect or /proc dirty bits. (Thanks to Douglas Steel + (doug@wg.icl.co.uk)). +- More bug fixes and workarounds for Solaris 2.X. (These were + mostly related to putting the collector in a dynamic library, + which didn't really work before. Also SOLARIS_THREADS + didn't interact well with dl_open.) Thanks to btlewis@eng.sun.com. +- Fixed a serious performance bug on the DEC Alpha. The text + segment was getting registered as part of the root set. + (Amazingly, the result was still fast enough that the bug + was not conspicuous.) The fix works on OSF/1, version 1.3. + Hopefully it also works on other versions of OSF/1 ... +- Fixed a bug in GC_clear_roots. +- Fixed a bug in GC_generic_malloc_words_small that broke + gc_inl.h. (Reported by Antoine de Maricourt. I broke it + in trying to tweak the Mac port.) +- Fixed some problems with cord/de under Linux. +- Fixed some cord problems, notably with CORD_riter4. +- Added DG/UX port. + Thanks to Ben A. Mesander (ben@piglet.cr.usgs.gov) +- Added finalization registration routines with weaker ordering + constraints. (This is necessary for C++ finalization with + multiple inheritance, since the compiler often adds self-cycles.) +- Filled the holes in the SCO port. (Thanks to Michael Arnoldus + <chime@proinf.dk>.) +- John Ellis' additions to the C++ support: From John: + +* I completely rewrote the documentation in the interface gc_c++.h +(later renamed gc_cpp.h). I've tried to make it both clearer and more +precise. + +* The definition of accessibility now ignores pointers from an +finalizable object (an object with a clean-up function) to itself. +This allows objects with virtual base classes to be finalizable by the +collector. Compilers typically implement virtual base classes using +pointers from an object to itself, which under the old definition of +accessibility prevented objects with virtual base classes from ever +being collected or finalized. + +* gc_cleanup now includes gc as a virtual base. This was enabled by +the change in the definition of accessibility. + +* I added support for operator new[]. Since most (all?) compilers +don't yet support operator new[], it is conditionalized on +-DOPERATOR_NEW_ARRAY. The code is untested, but its trivial and looks +correct. + +* The test program test_gc_c++ (later renamed test_cpp.cc) +tries to test for the C++-specific functionality not tested by the +other programs. +- Added <unistd.h> include to misc.c. (Needed for ppcr.) +- Added PowerMac port. (Thanks to Patrick Beard again.) +- Fixed "srcdir"-related Makefile problems. Changed things so + that all externally visible include files always appear in the + include subdirectory of the source. Made gc.h directly + includable from C++ code. (These were at Per + Bothner's suggestion.) +- Changed Intel code to also mark from ebp (Kevin Warne's + suggestion). +- Renamed C++ related files so they could live in a FAT + file system. (Charles Fiterman's suggestion.) +- Changed Windows NT Makefile to include C++ support in + gc.lib. Added C++ test as Makefile target. + +Since version 4.3: + - ASM_CLEAR_CODE was erroneously defined for HP + PA machines, resulting in a compile error. + - Fixed OS/2 Makefile to create a library. (Thanks to + Mark Boulter (mboulter@vnet.ibm.com)). + - Gc_cleanup objects didn't work if they were created on + the stack. Fixed. + - One copy of Gc_cpp.h in the distribution was out of + synch, and failed to document some known compiler + problems with explicit destructor invocation. Partially + fixed. There are probably other compilers on which + gc_cleanup is miscompiled. + - Fixed Makefile to pass C compiler flags to C++ compiler. + - Added Mac fixes. + - Fixed os_dep.c to work around what appears to be + a new and different VirtualQuery bug under newer + versions of win32S. + - GC_non_gc_bytes was not correctly maintained by + GC_free. Fixed. Thanks to James Clark (jjc@jclark.com). + - Added GC_set_max_heap_size. + - Changed allocation code to ignore blacklisting if it is preventing + use of a very large block of memory. This has the advantage + that naive code allocating very large objects is much more + likely to work. The downside is you might no + longer find out that such code should really use + GC_malloc_ignore_off_page. + - Changed GC_printf under win32 to close and reopen the file + between calls. FAT file systems otherwise make the log file + useless for debugging. + - Added GC_try_to_collect and GC_get_bytes_since_gc. These + allow starting an abortable collection during idle times. + This facility does not require special OS support. (Thanks to + Michael Spertus of Geodesic Systems for suggesting this. It was + actually an easy addition. Kumar Srikantan previously added a similar + facility to a now ancient version of the collector. At the time + this was much harder, and the result was less convincing.) + - Added some support for the Borland development environment. (Thanks + to John Ellis and Michael Spertus.) + - Removed a misfeature from checksums.c that caused unexpected + heap growth. (Thanks to Scott Schwartz.) + - Changed finalize.c to call WARN if it encounters a finalization cycle. + WARN is defined in gc_priv.h to write a message, usually to stdout. + In many environments, this may be inappropriate. + - Renamed NO_PARAMS in gc.h to GC_NO_PARAMS, thus adhering to my own + naming convention. + - Added GC_set_warn_proc to intercept warnings. + - Fixed Amiga port. (Thanks to Michel Schinz (schinz@alphanet.ch).) + - Fixed a bug in mark.c that could result in an access to unmapped + memory from GC_mark_from_mark_stack on machines with unaligned + pointers. + - Fixed a win32 specific performance bug that could result in scanning of + objects allocated with the system malloc. + - Added REDIRECT_MALLOC. + +Since version 4.4: + - Fixed many minor and one major README bugs. (Thanks to Franklin Chen + (chen@adi.com) for pointing out many of them.) + - Fixed ALPHA/OSF/1 dynamic library support. (Thanks to Jonathan Bachrach + (jonathan@harlequin.com)). + - Added incremental GC support (MPROTECT_VDB) for Linux (with some + help from Bruno Haible). + - Altered SPARC recognition tests in gc.h and config.h (mostly as + suggested by Fergus Henderson). + - Added basic incremental GC support for win32, as implemented by + Windows NT and Windows 95. GC_enable_incremental is a noop + under win32s, which doesn't implement enough of the VM interface. + - Added -DLARGE_CONFIG. + - Fixed GC_..._ignore_off_page to also function without + -DALL_INTERIOR_POINTERS. + - (Hopefully) fixed RS/6000 port. (Only the test was broken.) + - Fixed a performance bug in the nonincremental collector running + on machines supporting incremental collection with MPROTECT_VDB + (e.g. SunOS 4, DEC AXP). This turned into a correctness bug under + win32s with win32 incremental collection. (Not all memory protection + was disabled.) + - Fixed some ppcr related bit rot. + - Caused dynamic libraries to be unregistered before reregistering. + The old way turned out to be a performance bug on some machines. + - GC_root_size was not properly maintained under MSWIN32. + - Added -DNO_DEBUGGING and GC_dump. + - Fixed a couple of bugs arising with SOLARIS_THREADS + + REDIRECT_MALLOC. + - Added NetBSD/M68K port. (Thanks to Peter Seebach + <seebs@taniemarie.solon.com>.) + - Fixed a serious realloc bug. For certain object sizes, the collector + wouldn't scan the expanded part of the object. (Thanks to Clay Spence + (cds@peanut.sarnoff.com) for noticing the problem, and helping me to + track it down.) + +Since version 4.5: + - Added Linux ELF support. (Thanks to Arrigo Triulzi <arrigo@ic.ac.uk>.) + - GC_base crashed if it was called before any other GC_ routines. + This could happen if a gc_cleanup object was allocated outside the heap + before any heap allocation. + - The heap expansion heuristic was not stable if all objects had finalization + enabled. Fixed finalize.c to count memory in finalization queue and + avoid explicit deallocation. Changed alloc.c to also consider this count. + (This is still not recommended. It's expensive if nothing else.) Thanks + to John Ellis for pointing this out. + - GC_malloc_uncollectable(0) was broken. Thanks to Phong Vo for pointing + this out. + - The collector didn't compile under Linux 1.3.X. (Thanks to Fred Gilham for + pointing this out.) The current workaround is ugly, but expected to be + temporary. + - Fixed a formatting problem for SPARC stack traces. + - Fixed some '=='s in os_dep.c that should have been assignments. + Fortunately these were in code that should never be executed anyway. + (Thanks to Fergus Henderson.) + - Fixed the heap block allocator to only drop blacklisted blocks in small + chunks. Made BL_LIMIT self adjusting. (Both of these were in response + to heap growth observed by Paul Graham.) + - Fixed the Metrowerks/68K Mac code to also mark from a6. (Thanks + to Patrick Beard.) + - Significantly updated README.debugging. + - Fixed some problems with longjmps out of signal handlers, especially under + Solaris. Added a workaround for the fact that siglongjmp doesn't appear to + do the right thing with -lthread under Solaris. + - Added MSDOS/djgpp port. (Thanks to Mitch Harris (maharri@uiuc.edu).) + - Added "make reserved_namespace" and "make user_namespace". The + first renames ALL "GC_xxx" identifiers as "_GC_xxx". The second is the + inverse transformation. Note that doing this is guaranteed to break all + clients written for the other names. + - descriptor field for kind NORMAL in GC_obj_kinds with ADD_BYTE_AT_END + defined should be -ALIGNMENT not WORDS_TO_BYTES(-1). This is + a serious bug on machines with pointer alignment of less than a word. + - GC_ignore_self_finalize_mark_proc didn't handle pointers to very near the + end of the object correctly. Caused failures of the C++ test on a DEC Alpha + with g++. + - gc_inl.h still had problems. Partially fixed. Added warnings at the + beginning to hopefully specify the remaining dangers. + - Added DATAEND definition to config.h. + - Fixed some of the .h file organization. Fixed "make floppy". + +Since version 4.6: + - Fixed some compilation problems with -DCHECKSUMS (thanks to Ian Searle) + - Updated some Mac specific files to synchronize with Patrick Beard. + - Fixed a serious bug for machines with non-word-aligned pointers. + (Thanks to Patrick Beard for pointing out the problem. The collector + should fail almost any conceivable test immediately on such machines.) + +Since version 4.7: + - Changed a "comment" in a MacOS specific part of mach-dep.c that caused + gcc to fail on other platforms. + +Since version 4.8 + - More README.debugging fixes. + - Objects ready for finalization, but not finalized in the same GC + cycle, could be prematurely collected. This occasionally happened + in test_cpp. + - Too little memory was obtained from the system for very large + objects. That could cause a heap explosion if these objects were + not contiguous (e.g. under PCR), and too much of them was blacklisted. + - Due to an improper initialization, the collector was too hesitant to + allocate blacklisted objects immediately after system startup. + - Moved GC_arrays from the data into the bss segment by not explicitly + initializing it to zero. This significantly + reduces the size of executables, and probably avoids some disk accesses + on program startup. It's conceivable that it might break a port that I + didn't test. + - Fixed EMX_MAKEFILE to reflect the gc_c++.h to gc_cpp.h renaming which + occurred a while ago. + +Since 4.9: + - Fixed a typo around a call to GC_collect_or_expand in alloc.c. It broke + handling of out of memory. (Thanks to Patrick Beard for noticing.) + +Since 4.10: + - Rationalized (hopefully) GC_try_to_collect in an incremental collection + environment. It appeared to not handle a call while a collection was in + progress, and was otherwise too conservative. + - Merged GC_reclaim_or_delete_all into GC_reclaim_all to get rid of some + code. + - Added Patrick Beard's Mac fixes, with substantial completely untested + modifications. + - Fixed the MPROTECT_VDB code to deal with large pages and imprecise + fault addresses (as on an UltraSPARC running Solaris 2.5). Note that this + was not a problem in the default configuration, which uses PROC_VDB. + - The DEC Alpha assembly code needed to restore $gp between calls. + Thanks to Fergus Henderson for tracking this down and supplying a + patch. + - The write command for "de" was completely broken for large files. + I used the easiest portable fix, which involved changing the semantics + so that f.new is written instead of overwriting f. That's safer anyway. + - Added README.solaris2 with a discussion of the possible problems of + mixing the collector's sbrk allocation with malloc/realloc. + - Changed the data segment starting address for SGI machines. The + old code failed under IRIX6. + - Required double word alignment for MIPS. + - Various minor fixes to remove warnings. + - Attempted to fix some Solaris threads problems reported by Zhiying Chen. + In particular, the collector could try to fork a thread with the + world stopped as part of GC_thr_init. It also failed to deal with + the case in which the original thread terminated before the whole + process did. + - Added -DNO_EXECUTE_PERMISSION. This has a major performance impact + on the incremental collector under Irix, and perhaps under other + operating systems. + - Added some code to support allocating the heap with mmap. This may + be preferable under some circumstances. + - Integrated dynamic library support for HP. + (Thanks to Knut Tvedten <knuttv@ifi.uio.no>.) + - Integrated James Clark's win32 threads support, and made a number + of changes to it, many of which were suggested by Pontus Rydin. + This is still not 100% solid. + - Integrated Alistair Crooks' support for UTS4 running on an Amdahl + 370-class machine. + - Fixed a serious bug in explicitly typed allocation. Objects requiring + large descriptors where handled in a way that usually resulted in + a segmentation fault in the marker. (Thanks to Jeremy Fitzhardinge + for helping to track this down.) + - Added partial support for GNU win32 development. (Thanks to Fergus + Henderson.) + - Added optional support for Java-style finalization semantics. (Thanks + to Patrick Bridges.) This is recommended only for Java implementations. + - GC_malloc_uncollectable faulted instead of returning 0 when out of + memory. (Thanks to dan@math.uiuc.edu for noticing.) + - Calls to GC_base before the collector was initialized failed on a + DEC Alpha. (Thanks to Matthew Flatt.) + - Added base pointer checking to GC_REGISTER_FINALIZER in debugging + mode, at the suggestion of Jeremy Fitzhardinge. + - GC_debug_realloc failed for uncollectable objects. (Thanks to + Jeremy Fitzhardinge.) + - Explicitly typed allocation could crash if it ran out of memory. + (Thanks to Jeremy Fitzhardinge.) + - Added minimal support for a DEC Alpha running Linux. + - Fixed a problem with allocation of objects whose size overflowed + ptrdiff_t. (This now fails unconditionally, as it should.) + - Added the beginning of Irix pthread support. + - Integrated Xiaokun Zhu's fixes for djgpp 2.01. + - Added SGI-style STL allocator support (gc_alloc.h). + - Fixed a serious bug in README.solaris2. Multithreaded programs must include + gc.h with SOLARIS_THREADS defined. + - Changed GC_free so it actually deallocates uncollectable objects. + (Thanks to Peter Chubb for pointing out the problem.) + - Added Linux ELF support for dynamic libararies. (Thanks again to + Patrick Bridges.) + - Changed the Borland cc configuration so that the assembler is not + required. + - Fixed a bug in the C++ test that caused it to fail in 64-bit + environments. + +Since 4.11: + - Fixed ElfW definition in dyn_load.c. (Thanks to Fergus Henderson.) + This prevented the dynamic library support from compiling on some + older ELF Linux systems. + - Fixed UTS4 port (which I apparently mangled during the integration) + (Thanks to again to Alistair Crooks.) + - "Make C++" failed on Suns with SC4.0, due to a problem with "bool". + Fixed in gc_priv.h. + - Added more pieces for GNU win32. (Thanks to Timothy N. Newsham.) + The current state of things should suffice for at least some + applications. + - Changed the out of memory retry count handling as suggested by + Kenjiro Taura. (This matters only if GC_max_retries > 0, which + is no longer the default.) + - If a /proc read failed repeatedly, GC_written_pages was not updated + correctly. (Thanks to Peter Chubb for diagnosing this.) + - Under unlikely circumstances, the allocator could infinite loop in + an out of memory situation. (Thanks again to Kenjiro Taura for + identifying the problem and supplying a fix.) + - Fixed a syntactic error in the DJGPP code. (Thanks to Fergus + Henderson for finding this by inspection.) Also fixed a test program + problem with DJGPP (Thanks to Peter Monks.) + - Atomic uncollectable objects were not treated correctly by the + incremental collector. This resulted in weird log statistics and + occasional performance problems. (Thanks to Peter Chubb for pointing + this out.) + - Fixed some problems resulting from compilers that dont define + __STDC__. In this case void * and char * were used inconsistently + in some cases. (Void * should not have been used at all. If + you have an ANSI superset compiler that does not define __STDC__, + please compile with -D__STDC__=0. Thanks to Manuel Serrano and others + for pointing out the problem.) + - Fixed a compilation problem on Irix with -n32 and -DIRIX_THREADS. + Also fixed some other IRIX_THREADS problems which may or may not have + had observable symptoms. + - Fixed an HP PA compilation problem in dyn_load.c. (Thanks to + Philippe Queinnec.) + - SEGV fault handlers sometimes did not get reset correctly. (Thanks + to David Pickens.) + - Added a fix for SOLARIS_THREADS on Intel. (Thanks again to David + Pickens.) This probably needs more work to become functional. + - Fixed struct sigcontext_struct in os_dep.c for compilation under + Linux 2.1.X. (Thanks to Fergus Henderson.) + - Changed the DJGPP STACKBOTTOM and DATASTART values to those suggested + by Kristian Kristensen. These may still not be right, but it is + it is likely to work more often than what was there before. They may + even be exactly right. + - Added a #include <string.h> to test_cpp.cc. This appears to help + with HP/UX and gcc. (Thanks to assar@sics.se.) + - Version 4.11 failed to run in incremental mode on recent 64-bit Irix + kernels. This was a problem related to page unaligned heap segments. + Changed the code to page align heap sections on all platforms. + (I had mistakenly identified this as a kernel problem earlier. + It was not.) + - Version 4.11 did not make allocated storage executable, except on + one or two platforms, due to a bug in a #if test. (Thanks to Dave + Grove for pointing this out.) + - Added sparc_sunos4_mach_dep.s to support Sun's compilers under SunOS4. + - Added GC_exclude_static_roots. + - Fixed the object size mapping algorithm. This shouldn't matter, + but the old code was ugly. + - Heap checking code could die if one of the allocated objects was + larger than its base address. (Unsigned underflow problem. Thanks + to Clay Spence for isolating the problem.) + - Added RS6000 (AIX) dynamic library support and fixed STACK_BOTTOM. + (Thanks to Fred Stearns.) + - Added Fergus Henderson's patches for improved robustness with large + heaps and lots of blacklisting. + - Added Peter Chubb's changes to support Solaris Pthreads, to support + MMAP allocation in Solaris, to allow Solaris to find dynamic libraries + through /proc, to add malloc_typed_ignore_off_page, and a few other + minor features and bug fixes. + - The Solaris 2 port should not use sbrk. I received confirmation from + Sun that the use of sbrk and malloc in the same program is not + supported. The collector now defines USE_MMAP by default on Solaris. + - Replaced the djgpp makefile with Gary Leavens' version. + - Fixed MSWIN32 detection test. + - Added Fergus Henderson's patches to allow putting the collector into + a DLL under GNU win32. + - Added Ivan V. Demakov's port to Watcom C on X86. + - Added Ian Piumarta's Linux/PowerPC port. + - On Brian Burton's suggestion added PointerFreeGC to the placement + options in gc_cpp.h. This is of course unsafe, and may be controversial. + On the other hand, it seems to be needed often enough that it's worth + adding as a standard facility. + +Since 4.12: + - Fixed a crucial bug in the Watcom port. There was a redundant decl + of GC_push_one in gc_priv.h. + - Added FINALIZE_ON_DEMAND. + - Fixed some pre-ANSI cc problems in test.c. + - Removed getpagesize() use for Solaris. It seems to be missing in one + or two versions. + - Fixed bool handling for SPARCCompiler version 4.2. + - Fixed some files in include that had gotten unlinked from the main + copy. + - Some RS/6000 fixes (missing casts). Thanks to Toralf Foerster. + - Fixed several problems in GC_debug_realloc, affecting mostly the + FIND_LEAK case. + - GC_exclude_static_roots contained a buggy unsigned comparison to + terminate a loop. (Thanks to Wilson Ho.) + - CORD_str failed if the substring occurred at the last possible position. + (Only affects cord users.) + - Fixed Linux code to deal with RedHat 5.0 and integrated Peter Bigot's + os_dep.c code for dealing with various Linux versions. + - Added workaround for Irix pthreads sigaction bug and possible signal + misdirection problems. +Since alpha1: + - Changed RS6000 STACKBOTTOM. + - Integrated Patrick Beard's Mac changes. + - Alpha1 didn't compile on Irix m.n, m < 6. + - Replaced Makefile.dj with a new one from Gary Leavens. + - Added Andrew Stitcher's changes to support SCO OpenServer. + - Added PRINT_BLACK_LIST, to allow debugging of high densities of false + pointers. + - Added code to debug allocator to keep track of return address + in GC_malloc caller, thus giving a bit more context. + - Changed default behavior of large block allocator to more + aggressively avoid fragmentation. This is likely to slow down the + collector when it succeeds at reducing space cost. + - Integrated Fergus Henderson's CYGWIN32 changes. They are untested, + but needed for newer versions. + - USE_MMAP had some serious bugs. This caused the collector to fail + consistently on Solaris with -DSMALL_CONFIG. + - Added Linux threads support, thanks largely to Fergus Henderson. +Since alpha2: + - Fixed more Linux threads problems. + - Changed default GC_free_space_divisor to 3 with new large block allocation. + (Thanks to Matthew Flatt for some measurements that suggest the old + value sometimes favors space too much over time.) + - More CYGWIN32 fixes. + - Integrated Tyson-Dowd's Linux-M68K port. + - Minor HP PA and DEC UNIX fixes from Fergus Henderson. + - Integrated Christoffe Raffali's Linux-SPARC changes. + - Allowed for one more GC fixup iteration after a full GC in incremental + mode. Some quick measurements suggested that this significantly + reduces pause times even with smaller GC_RATE values. + - Moved some more GC data structures into GC_arrays. This decreases + pause times and GC overhead, but makes debugging slightly less convenient. + - Fixed namespace pollution problem ("excl_table"). + - Made GC_incremental a constant for -DSMALL_CONFIG, hopefully shrinking + that slightly. + - Added some win32 threads fixes. + - Integrated Ivan Demakov and David Stes' Watcom fixes. + - Various other minor fixes contributed by many people. + - Renamed config.h to gcconfig.h, since config.h tends to be used for + many other things. + - Integrated Matthew Flatt's support for 68K MacOS "far globals". + - Fixed up some of the dynamic library Makefile targets for consistency + across platforms. + - Fixed a USE_MMAP typo that caused out-of-memory handling to fail + on Solaris. + - Added code to test.c to test thread creation a bit more. + - Integrated GC_win32_free_heap, as suggested by Ivan Demakov. + - Fixed Solaris 2.7 stack base finding problem. (This may actually + have been done in an earlier alpha release.) +Since alpha3: + - Fixed MSWIN32 recognition test, which interfered with cygwin. + - Removed unnecessary gc_watcom.asm from distribution. Removed + some obsolete README.win32 text. + - Added Alpha Linux incremental GC support. (Thanks to Philipp Tomsich + for code for retrieving the fault address in a signal handler.) + Changed Linux signal handler context argument to be a pointer. + - Took care of some new warnings generated by the 7.3 SGI compiler. + - Integrated Phillip Musumeci's FreeBSD/ELF fixes. + - -DIRIX_THREADS was broken with the -o32 ABI (typo in gc_priv.h> + +Since 4.13: + - Fixed GC_print_source_ptr to not use a prototype. + - generalized CYGWIN test. + - gc::new did the wrong thing with PointerFreeGC placement. + (Thanks to Rauli Ruohonen.) + - In the ALL_INTERIOR_POINTERS (default) case, some callee-save register + values could fail to be scanned if the register was saved and + reused in a GC frame. This showed up in verbose mode with gctest + compiled with an unreleased SGI compiler. I vaguely recall an old + bug report that may have been related. The bug was probably quite old. + (The problem was that the stack scanning could be deferred until + after the relevant frame was overwritten, and the new save location + might be outside the scanned area. Fixed by more eager stack scanning.) + - PRINT_BLACK_LIST had some problems. A few source addresses were garbage. + - Replaced Makefile.dj and added -I flags to cord make targets. + (Thanks to Gary Leavens.) + - GC_try_to_collect was broken with the nonincremental collector. + - gc_cleanup destructors could pass the wrong address to + GC_register_finalizer_ignore_self in the presence of multiple + inheritance. (Thanks to Darrell Schiebel.) + - Changed PowerPC Linux stack finding code. + +Since 4.14alpha1 + - -DSMALL_CONFIG did not work reliably with large (> 4K) pages. + Recycling the mark stack during expansion could result in a size + zero heap segment, which confused things. (This was probably also an + issue with the normal config and huge pages.) + - Did more work to make sure that callee-save registers were scanned + completely, even with the setjmp-based code. Added USE_GENERIC_PUSH_REGS + macro to facilitate testing on machines I have access to. + - Added code to explicitly push register contents for win32 threads. + This seems to be necessary. (Thanks to Pierre de Rop.) + +Since 4.14alpha2 + - changed STACKBOTTOM for DJGPP (Thanks to Salvador Eduardo Tropea). + +Since 4.14 + - Reworked large block allocator. Now uses multiple doubly linked free + lists to approximate best fit. + - Changed heap expansion heuristic. Entirely free blocks are no longer + counted towards the heap size. This seems to have a major impact on + heap size stability; the old version could expand the heap way too + much in the presence of large block fragmentation. + - added -DGC_ASSERTIONS and some simple assertions inside the collector. + This is mainlyt for collector debugging. + - added -DUSE_MUNMAP to allow the heap to shrink. Suupported on only + a few UNIX-like platforms for now. + - added GC_dump_regions() for debugging of fragmentation issues. + - Changed PowerPC pointer alignment under Linux to 4. (This needs + checking by someone who has one. The suggestions came to me via a + rather circuitous path.) + - Changed the Linux/Alpha port to walk the data segment backwards until + it encounters a SIGSEGV. The old way to find the start of the data + segment broke with a recent release. + - cordxtra.c needed to call GC_REGISTER_FINALIZER instead of + GC_register_finalizer, so that it would continue to work with GC_DEBUG. + - allochblk sometimes cleared the wrong block for debugging purposes + when it dropped blacklisted blocks. This could result in spurious + error reports with GC_DEBUG. + - added MACOS X Server support. (Thanks to Andrew Stone.) + - Changed the Solaris threads code to ignore stack limits > 8 MB with + a warning. Empirically, it is not safe to access arbitrary pages + in such large stacks. And the dirty bit implementation does not + guarantee that none of them will be accessed. + - Integrated Martin Tauchmann's Amiga changes. + - Integrated James Dominy's OpenBSD/SPARC port. + +Since 5.0alpha1 + - Fixed bugs introduced in alpha1 (OpenBSD & large block initialization). + - Added -DKEEP_BACK_PTRS and backptr.h interface. (The implementation + idea came from Al Demers.) + +Since 5.0alpha2 + - Added some highly incomplete code to support a copied young generation. + Comments on nursery.h are appreciated. + - Changed -DFIND_LEAK, -DJAVA_FINALIZATION, and -DFINALIZE_ON_DEMAND, + so the same effect could be obtained with a runtime switch. This is + a step towards standardizing on a single dynamic GC library. + - Significantly changed the way leak detection is handled, as a consequence + of the above. + +Since 5.0 alpha3 + - Added protection fault handling patch for Linux/M68K from Fergus + Henderson and Roman Hodek. + - Removed the tests for SGI_SOURCE in new_gc_alloc.h. This was causing that + interface to fail on nonSGI platforms. + - Changed the Linux stack finding code to use /proc, after changing it + to use HEURISTIC1. (Thanks to David Mossberger for pointing out the + /proc hook.) + - Added HP/UX incremental GC support and HP/UX 11 thread support. + Thread support is currently still flakey. + - Added basic Linux/IA64 support. + - Integrated Anthony Green's PicoJava support. + - Integrated Scott Ananian's StrongARM/NetBSD support. + - Fixed some fairly serious performance bugs in the incremental + collector. These have probably been there essentially forever. + (Mark bits were sometimes set before scanning dirty pages. + The reclaim phase unnecessarily dirtied full small object pages.) + - Changed the reclaim phase to ignore nearly full pages to avoid + touching them. + - Limited GC_black_list_spacing to roughly the heap growth increment. + - Changed full collection triggering heuristic to decrease full GC + frequency by default, but to explicitly trigger full GCs during + heap growth. This doesn't always improve things, but on average it's + probably a win. + - GC_debug_free(0, ...) failed. Thanks to Fergus Henderson for the + bug report and fix. + +Since 5.0 alpha4 + - GC_malloc_explicitly_typed and friends sometimes failed to + initialize first word. + - Added allocation routines and support in the marker for mark descriptors + in a type structure referenced by the first word of an object. This was + introduced to support gcj, but hopefully in a way that makes it + generically useful. + - Added GC_requested_heapsize, and inhibited collections in nonincremental + mode if the actual used heap size is less than what was explicitly + requested. + - The Solaris pthreads version of GC_pthread_create didn't handle a NULL + attribute pointer. Solaris thread support used the wrong default thread + stack size. (Thanks to Melissa O'Neill for the patch.) + - Changed PUSH_CONTENTS macro to no longer modify first parameter. + This usually doesn't matter, but it was certainly an accident waiting + to happen ... + - Added GC_register_finalizer_no_order and friends to gc.h. They're + needed by Java implementations. + - Integrated a fix for a win32 deadlock resulting from clock() calling + malloc. (Thanks to Chris Dodd.) + - Integrated Hiroshi Kawashima's port to Linux/MIPS. This was designed + for a handheld platform, and may or may not be sufficient for other + machines. + - Fixed a va_arg problem with the %c specifier in cordprnt.c. It appears + that this was always broken, but recent versions of gcc are the first to + report the (statically detectable) bug. + - Added an attempt at a more general solution to dlopen races/deadlocks. + GC_dlopen now temporarily disables collection. Still not ideal, but ... + - Added -DUSE_I686_PREFETCH, -DUSE_3DNOW_PREFETCH, and support for IA64 + prefetch instructions. May improve performance measurably, but I'm not + sure the code will run correctly on processors that don't support the + instruction. Won't build except with very recent gcc. + - Added caching for header lookups in the marker. This seems to result + in a barely measurable performance gain. Added support for interleaved + lookups of two pointers, but unconfigured that since the performance + gain is currently near zero, and it adds to code size. + - Changed Linux DATA_START definition to check both data_start and + __data_start, since nothing else seems to be portable. + - Added -DUSE_LD_WRAP to optionally take advantage of the GNU ld function + wrapping mechanism. Probably currently useful only on Linux. + - Moved some variables for the scratch allocator into GC_arrays, on + Martin Hirzel's suggestion. + - Fixed a win32 threads bug that caused the collector to not look for + interior pointers from one of the thread stacks without + ALL_INTERIOR_POINTERS. (Thanks to Jeff Sturm.) + - Added Mingw32 support. (Thanks again to Jeff Sturm for the patch.) + - Changed the alpha port to use the generic register scanning code instead + of alpha_mach_dep.s. Alpha_mach_dep.s doesn't look for pointers in fp + registers, but gcc sometimes spills pointers there. (Thanks to Manuel Serrano + for helping me debug this by email.) Changed the IA64 code to do something + similar for similar reasons. + +To do: + - Very large root set sizes (> 16 MB or so) could cause the collector + to abort with an unexpected mark stack overflow. (Thanks again to + Peter Chubb.) NOT YET FIXED. Workaround is to increase the initial + size. + - The SGI version of the collector marks from mmapped pages, even + if they are not part of dynamic library static data areas. This + causes performance problems with some SGI libraries that use mmap + as a bitmap allocator. NOT YET FIXED. It may be possible to turn + off DYNAMIC_LOADING in the collector as a workaround. It may also + be possible to conditionally intercept mmap and use GC_exclude_static_roots. + The real fix is to walk rld data structures, which looks possible. + - Integrate MIT and DEC pthreads ports. + - Incremental collector should handle large objects better. Currently, + it looks like the whole object is treated as dirty if any part of it + is. + - Cord/cordprnt.c doesn't build on a few platforms (notably PowerPC), since + we make some unwarranted assumptions about how varargs are handled. This + currently makes the cord-aware versions of printf unusable on some platforms. + Fixing this is unfortunately not trivial. diff --git a/boehm-gc/README.Mac b/boehm-gc/README.Mac new file mode 100644 index 00000000000..04f468251a1 --- /dev/null +++ b/boehm-gc/README.Mac @@ -0,0 +1,385 @@ +Patrick Beard's Notes for building GC v4.12 with CodeWarrior Pro 2: +---------------------------------------------------------------------------- +The current build environment for the collector is CodeWarrior Pro 2. +Projects for CodeWarrior Pro 2 (and for quite a few older versions) +are distributed in the file Mac_projects.sit.hqx. The project file +:Mac_projects:gc.prj builds static library versions of the collector. +:Mac_projects:gctest.prj builds the GC test suite. + +Configuring the collector is still done by editing the files +:Mac_files:MacOS_config.h and :Mac_files:MacOS_Test_config.h. + +Lars Farm's suggestions on building the collector: +---------------------------------------------------------------------------- +Garbage Collection on MacOS - a manual 'MakeFile' +------------------------------------------------- + +Project files and IDE's are great on the Macintosh, but they do have +problems when used as distribution media. This note tries to provide +porting instructions in pure TEXT form to avoid those problems. A manual +'makefile' if you like. + + GC version: 4.12a2 + Codewarrior: CWPro1 + date: 18 July 1997 + +The notes may or may not apply to earlier or later versions of the +GC/CWPro. Actually, they do apply to earlier versions of both except that +until recently a project could only build one target so each target was a +separate project. The notes will most likely apply to future versions too. +Possibly with minor tweaks. + +This is just to record my experiences. These notes do not mean I now +provide a supported port of the GC to MacOS. It works for me. If it works +for you, great. If it doesn't, sorry, try again...;-) Still, if you find +errors, please let me know. + + mailto: lars.farm@ite.mh.se + + address: Lars Farm + Krönvägen 33b + 856 44 Sundsvall + Sweden + +Porting to MacOS is a bit more complex than it first seems. Which MacOS? +68K/PowerPC? Which compiler? Each supports both 68K and PowerPC and offer a +large number of (unique to each environment) compiler settings. Each +combination of compiler/68K/PPC/settings require a unique combination of +standard libraries. And the IDE's does not select them for you. They don't +even check that the library is built with compatible setting and this is +the major source of problems when porting the GC (and otherwise too). + +You will have to make choices when you configure the GC. I've made some +choices here, but there are other combinations of settings and #defines +that work too. + +As for target settings the major obstacles may be: +- 68K Processor: check "4-byte Ints". +- PPC Processor: uncheck "Store Static Data in TOC". + +What you need to do: +=================== + +1) Build the GC as a library +2) Test that the library works with 'test.c'. +3) Test that the C++ interface 'gc_cpp.cc/h' works with 'test_cpp.cc'. + +1) The Libraries: +================= +I made one project with four targets (68K/PPC tempmem or appheap). One target +will suffice if you're able to decide which one you want. I wasn't... + +Codewarrior allows a large number of compiler/linker settings. I used these: + +Settings shared by all targets: +------------------------------ +o Access Paths: + - User Paths: the GC folder + - System Paths: {Compiler}:Metrowerks Standard Library: + {Compiler}:MacOS Support:Headers: + {Compiler}:MacOS Support:MacHeaders: +o C/C++ language: + - inlining: normal + - direct to SOM: off + - enable/check: exceptions, RTTI, bool (and if you like pool strings) + +PowerPC target settings +----------------------- +o Target Settings: + - name of target + - MacOS PPC Linker +o PPC Target + - name of library +o C/C++ language + - prefix file as described below +o PPC Processor + - Struct Alignment: PowerPC + - uncheck "Store Static Data in TOC" -- important! + I don't think the others matter, I use full optimization and its ok +o PPC Linker + - Factory Settings (SYM file with full paths, faster linking, dead-strip + static init, Main: __start) + + +68K target settings +------------------- +o Target Settings: + - name of target + - MacOS 68K Linker +o 68K Target + - name of library + - A5 relative data +o C/C++ language + - prefix file as described below +o 68K Processor + - Code model: smart + - Struct alignment: 68K + - FP: SANE + - enable 4-Byte Ints -- important! + I don't think the others matter. I selected... + - enable: 68020 + - enable: global register allocation +o IR Optimizer + - enable: Optimize Space, Optimize Speed + I suppose the others would work too, but haven't tried... +o 68K Linker + - Factory Settings (New Style MacsBug,SYM file with full paths, + A6 Frames, fast link, Merge compiler glue into segment 1, + dead-strip static init) + +Prefix Files to configure the GC sources +---------------------------------------- +The Codewarrior equivalent of commandline compilers -DNAME=X is to use +prefix-files. A TEXT file that is automatically #included before the first byte +of every source file. I used these: + +---- ( cut here ) ---- gc_prefix_tempmem.h -- 68K and PPC ----- + #include "gc_prefix_common.h" + #undef USE_TEMPORARY_MEMORY + #define USE_TEMPORARY_MEMORY +---- ( cut here ) ---- gc_prefix_appmem.h -- 68K and PPC ----- + #include "gc_prefix_common.h" + #undef USE_TEMPORARY_MEMORY +// #define USE_TEMPORARY_MEMORY + +---- ( cut here ) ---- gc_prefix_common.h -------------------- +// gc_prefix_common.h +// ------------------ +// Codewarrior prefix file to configure the GC libraries +// +// prefix files are the Codewarrior equivalent of the +// command line option -Dname=x frequently seen in makefiles + +#if !__MWERKS__ + #error only tried this with Codewarrior +#endif + +#if macintosh + #define MSL_USE_PRECOMPILED_HEADERS 0 + #include <ansi_prefix.mac.h> + #ifndef __STDC__ + #define __STDC__ 0 + #endif + + // See list of #defines to configure the library in: 'MakeFile' + // see also README + + #define SILENT // no collection messages. In case + // of trouble you might want this off + #define ALL_INTERIOR_POINTERS // follows interior pointers. +//#define DONT_ADD_BYTE_AT_END // disables the padding if defined. +//#define SMALL_CONFIG // whether to use a smaller heap. + #define NO_SIGNALS // signals aren't real on the Macintosh. + #define ATOMIC_UNCOLLECTABLE // GC_malloc_atomic_uncollectable() + + // define either or none as per personal preference + // used in malloc.c + #define REDIRECT_MALLOC GC_malloc +//#define REDIRECT_MALLOC GC_malloc_uncollectable + // if REDIRECT_MALLOC is #defined make sure that the GC library + // is listed before the ANSI/ISO libs in the Codewarrior + // 'Link order' panel +//#define IGNORE_FREE + + // mac specific configs +//#define USE_TEMPORARY_MEMORY // use Macintosh temporary memory. +//#define SHARED_LIBRARY_BUILD // build for use in a shared library. + +#else + // could build Win32 here too, or in the future + // Rhapsody PPC-mach, Rhapsody PPC-MacOS, + // Rhapsody Intel-mach, Rhapsody Intel-Win32,... + // ... ugh this will get messy ... +#endif + +// make sure ints are at least 32-bit +// ( could be set to 16-bit by compiler settings (68K) ) + +struct gc_private_assert_intsize_{ char x[ sizeof(int)>=4 ? 1 : 0 ]; }; + +#if __powerc + #if __option(toc_data) + #error turn off "store static data in TOC" when using GC + // ... or find a way to add TOC to the root set...(?) + #endif +#endif +---- ( cut here ) ---- end of gc_prefix_common.h ----------------- + +Files to build the GC libraries: +-------------------------------- + allchblk.c + alloc.c + blacklst.c + checksums.c + dbg_mlc.c + finalize.c + headers.c + mach_dep.c + MacOS.c -- contains MacOS code + malloc.c + mallocx.c + mark.c + mark_rts.c + misc.c + new_hblk.c + obj_map.c + os_dep.c -- contains MacOS code + ptr_chck.c + reclaim.c + stubborn.c + typd_mlc.c + gc++.cc -- this is 'gc_cpp.cc' with less 'inline' and + -- throw std::bad_alloc when out of memory + -- gc_cpp.cc works just fine too + +2) Test that the library works with 'test.c'. +============================================= + +The test app is just an ordinary ANSI-C console app. Make sure settings +match the library you're testing. + +Files +----- + test.c + the GC library to test -- link order before ANSI libs + suitable Mac+ANSI libraries + +prefix: +------ +---- ( cut here ) ---- gc_prefix_testlib.h -- all libs ----- +#define MSL_USE_PRECOMPILED_HEADERS 0 +#include <ansi_prefix.mac.h> +#undef NDEBUG + +#define ALL_INTERIOR_POINTERS /* for GC_priv.h */ +---- ( cut here ) ---- + +3) Test that the C++ interface 'gc_cpp.cc/h' works with 'test_cpp.cc'. + +The test app is just an ordinary ANSI-C console app. Make sure settings match +the library you're testing. + +Files +----- + test_cpp.cc + the GC library to test -- link order before ANSI libs + suitable Mac+ANSI libraries + +prefix: +------ +same as for test.c + +For convenience I used one test-project with several targets so that all +test apps are build at once. Two for each library to test: test.c and +gc_app.cc. When I was satisfied that the libraries were ok. I put the +libraries + gc.h + the c++ interface-file in a folder that I then put into +the MSL hierarchy so that I don't have to alter access-paths in projects +that use the GC. + +After that, just add the proper GC library to your project and the GC is in +action! malloc will call GC_malloc and free GC_free, new/delete too. You +don't have to call free or delete. You may have to be a bit cautious about +delete if you're freeing other resources than RAM. See gc_cpp.h. You can +also keep coding as always with delete/free. That works too. If you want, +"include <gc.h> and tweak it's use a bit. + +Symantec SPM +============ +It has been a while since I tried the GC in SPM, but I think that the above +instructions should be sufficient to guide you through in SPM too. SPM +needs to know where the global data is. Use the files 'datastart.c' and +'dataend.c'. Put 'datastart.c' at the top of your project and 'dataend.c' +at the bottom of your project so that all data is surrounded. This is not +needed in Codewarrior because it provides intrinsic variables +__datastart__, __data_end__ that wraps all globals. + +Source Changes (GC 4.12a2) +========================== +Very few. Just one tiny in the GC, not strictly needed. +- MacOS.c line 131 in routine GC_MacFreeTemporaryMemory() + change # if !defined(SHARED_LIBRARY_BUILD) + to # if !defined(SILENT) && !defined(SHARED_LIBRARY_BUILD) + To turn off a message when the application quits (actually, I faked + this change by #defining SHARED_LIBRARY_BUILD in a statically linked + library for more than a year without ill effects but perhaps this is + better). + +- test_cpp.cc + made the first lines of main() look like this: + ------------ + int main( int argc, char* argv[] ) { + #endif + #if macintosh // MacOS + char* argv_[] = {"test_cpp","10"}; // doesn't + argv=argv_; // have a + argc = sizeof(argv_)/sizeof(argv_[0]); // commandline + #endif // + + int i, iters, n; + # ifndef __GNUC__ + alloc dummy_to_fool_the_compiler_into_doing_things_it_currently_cant_handle; + ------------ + +- config.h [now gcconfig.h] + __MWERKS__ does not have to mean MACOS. You can use Codewarrior to + build a Win32 or BeOS library and soon a Rhapsody library. You may + have to change that #if... + + + + It worked for me, hope it works for you. + + Lars Farm + 18 July 1997 +---------------------------------------------------------------------------- + + +Patrick Beard's instructions (may be dated): + +v4.3 of the collector now runs under Symantec C++/THINK C v7.0.4, and +Metrowerks C/C++ v4.5 both 68K and PowerPC. Project files are provided +to build and test the collector under both development systems. + +Configuration +------------- + +To configure the collector, under both development systems, a prefix file +is used to set preprocessor directives. This file is called "MacOS_config.h". +Also to test the collector, "MacOS_Test_config.h" is provided. + +Testing +------- + +To test the collector (always a good idea), build one of the gctest projects, +gctest.¹ (Symantec C++/THINK C), mw/gctest.68K.¹, or mw/gctest.PPC.¹. The +test will ask you how many times to run; 1 should be sufficient. + +Building +-------- + +For your convenience project files for the major Macintosh development +systems are provided. + +For Symantec C++/THINK C, you must build the two projects gclib-1.¹ and +gclib-2.¹. It has to be split up because the collector has more than 32k +of static data and no library can have more than this in the Symantec +environment. (Future versions will probably fix this.) + +For Metrowerks C/C++ 4.5 you build gc.68K.¹/gc.PPC.¹ and the result will +be a library called gc.68K.lib/gc.PPC.lib. + +Using +----- + +Under Symantec C++/THINK C, you can just add the gclib-1.¹ and gclib-2.¹ +projects to your own project. Under Metrowerks, you add gc.68K.lib or +gc.PPC.lib and two additional files. You add the files called datastart.c +and dataend.c to your project, bracketing all files that use the collector. +See mw/gctest.¹ for an example. + +Include the projects/libraries you built above into your own project, +#include "gc.h", and call GC_malloc. You don't have to call GC_free. + + +Patrick C. Beard +January 4, 1995 diff --git a/boehm-gc/README.OS2 b/boehm-gc/README.OS2 new file mode 100644 index 00000000000..5345bbd0f65 --- /dev/null +++ b/boehm-gc/README.OS2 @@ -0,0 +1,6 @@ +The code assumes static linking, and a single thread. The editor de has +not been ported. The cord test program has. The supplied OS2_MAKEFILE +assumes the IBM C Set/2 environment, but the code shouldn't. + +Since we haven't figured out hoe to do perform partial links or to build static +libraries, clients currently need to link against a long list of executables. diff --git a/boehm-gc/README.alpha b/boehm-gc/README.alpha new file mode 100644 index 00000000000..213a13e3fef --- /dev/null +++ b/boehm-gc/README.alpha @@ -0,0 +1,22 @@ +Should work under OSF/1 and Linux. Currently no VMS or NT support, though +the latter shouldn't be hard. + +Incremental gc not yet supported under Linux because signal handler +for SIGSEGV can't get a hold of fault address. Dynamic library support +is also missing from Linux/alpha, probably for no good reason. + +Currently there is no thread support in the standard distribution. There +exists a separate port to DEC Unix pthreads. It should be possible to +port the X86 Linux threads support to Alpha without much trouble. + +If you get asssembler errors, be sure to read the first few lines of the +Makefile. + +From Philippe Queinnec: + +System: DEC/Alpha OSF1 v3.2, vendor cc +Problem: can't link if libgc has been compiled with "cc -std1". + It works if the library has been compiled with either gcc or "cc" + alone. The problem is because the variable "end" is not defined if + compiling in std1 mode (see man ld). +Proposed fix: none. Don't use cc -std1 ! diff --git a/boehm-gc/README.amiga b/boehm-gc/README.amiga new file mode 100644 index 00000000000..47b15884354 --- /dev/null +++ b/boehm-gc/README.amiga @@ -0,0 +1,180 @@ +=========================================================================== + Martin Tauchmann's notes (1-Apr-99) +=========================================================================== + +Works now, also with the GNU-C compiler V2.7.2.1. <ftp://ftp.unina.it/pub/amiga/geekgadgets/amiga/m68k/snapshots/971125/amiga-bin/> +Modify the `Makefile` +CC=cc $(ABI_FLAG) +to +CC=gcc $(ABI_FLAG) + +TECHNICAL NOTES + +- `GC_get_stack_base()`, `GC_register_data_segments()` works now with every + C compiler; also Workbench. + +- Removed AMIGA_SKIP_SEG, but the Code-Segment must not be scanned by GC. + + +PROBLEMS +- When the Linker, does`t merge all Code-Segments to an single one. LD of GCC + do it always. + +- With ixemul.library V47.3, when an GC program launched from another program + (example: `Make` or `if_mach M68K AMIGA gctest`), `GC_register_data_segments()` + found the Segment-List of the caller program. + Can be fixed, if the run-time initialization code (for C programs, usually *crt0*) + support `__data` and `__bss`. + +- PowerPC Amiga currently not supported. + +- Dynamic libraries (dyn_load.c) not supported. + + +TESTED WITH SOFTWARE + +`Optimized Oberon 2 C` (oo2c) <http://cognac.informatik.uni-kl.de/download/index.html> + + +TESTED WITH HARDWARE + +MC68030 + + +CONTACT + +Please, contact me at <martintauchmann@bigfoot.com>, when you change the +Amiga port. <http://martintauchmann.home.pages.de> + +=========================================================================== + Michel Schinz's notes +=========================================================================== +WHO DID WHAT + +The original Amiga port was made by Jesper Peterson. I (Michel Schinz) +modified it slightly to reflect the changes made in the new official +distributions, and to take advantage of the new SAS/C 6.x features. I also +created a makefile to compile the "cord" package (see the cord +subdirectory). + +TECHNICAL NOTES + +In addition to Jesper's notes, I have the following to say: + +- Starting with version 4.3, gctest checks to see if the code segment is + added to the root set or not, and complains if it is. Previous versions + of this Amiga port added the code segment to the root set, so I tried to + fix that. The only problem is that, as far as I know, it is impossible to + know which segments are code segments and which are data segments (there + are indeed solutions to this problem, like scanning the program on disk + or patch the LoadSeg functions, but they are rather complicated). The + solution I have chosen (see os_dep.c) is to test whether the program + counter is in the segment we are about to add to the root set, and if it + is, to skip the segment. The problems are that this solution is rather + awkward and that it works only for one code segment. This means that if + your program has more than one code segment, all of them but one will be + added to the root set. This isn't a big problem in fact, since the + collector will continue to work correctly, but it may be slower. + + Anyway, the code which decides whether to skip a segment or not can be + removed simply by not defining AMIGA_SKIP_SEG. But notice that if you do + so, gctest will complain (it will say that "GC_is_visible produced wrong + failure indication"). However, it may be useful if you happen to have + pointers stored in a code segment (you really shouldn't). + + If anyone has a good solution to the problem of finding, when a program + is loaded in memory, whether a segment is a code or a data segment, + please let me know. + +PROBLEMS + +If you have any problem with this version, please contact me at +schinz@alphanet.ch (but do *not* send long files, since we pay for +every mail!). + +=========================================================================== + Jesper Peterson's notes +=========================================================================== + +ADDITIONAL NOTES FOR AMIGA PORT + +These notes assume some familiarity with Amiga internals. + +WHY I PORTED TO THE AMIGA + +The sole reason why I made this port was as a first step in getting +the Sather(*) language on the Amiga. A port of this language will +be done as soon as the Sather 1.0 sources are made available to me. +Given this motivation, the garbage collection (GC) port is rather +minimal. + +(*) For information on Sather read the comp.lang.sather newsgroup. + +LIMITATIONS + +This port assumes that the startup code linked with target programs +is that supplied with SAS/C versions 6.0 or later. This allows +assumptions to be made about where to find the stack base pointer +and data segments when programs are run from WorkBench, as opposed +to running from the CLI. The compiler dependent code is all in the +GC_get_stack_base() and GC_register_data_segments() functions, but +may spread as I add Amiga specific features. + +Given that SAS/C was assumed, the port is set up to be built with +"smake" using the "SMakefile". Compiler options in "SCoptions" can +be set with "scopts" program. Both "smake" and "scopts" are part of +the SAS/C commercial development system. + +In keeping with the porting philosophy outlined above, this port +will not behave well with Amiga specific code. Especially not inter- +process comms via messages, and setting up public structures like +Intuition objects or anything else in the system lists. For the +time being the use of this library is limited to single threaded +ANSI/POSIX compliant or near-complient code. (ie. Stick to stdio +for now). Given this limitation there is currently no mechanism for +allocating "CHIP" or "PUBLIC" memory under the garbage collector. +I'll add this after giving it considerable thought. The major +problem is the entire physical address space may have to me scanned, +since there is no telling who we may have passed memory to. + +If you allocate your own stack in client code, you will have to +assign the pointer plus stack size to GC_stackbottom. + +The initial stack size of the target program can be compiled in by +setting the __stack symbol (see SAS documentaion). It can be over- +ridden from the CLI by running the AmigaDOS "stack" program, or from +the WorkBench by setting the stack size in the tool types window. + +SAS/C COMPILER OPTIONS (SCoptions) + +You may wish to check the "CPU" code option is appropriate for your +intended target system. + +Under no circumstances set the "StackExtend" code option in either +compiling the library or *ANY* client code. + +All benign compiler warnings have been suppressed. These mainly +involve lack of prototypes in the code, and dead assignments +detected by the optimizer. + +THE GOOD NEWS + +The library as it stands is compatible with the GigaMem commercial +virtual memory software, and probably similar PD software. + +The performance of "gctest" on an Amiga 2630 (68030 @ 25Mhz) +compares favourably with an HP9000 with similar architecture (a 325 +with a 68030 I think). + +----------------------------------------------------------------------- + +The Amiga port has been brought to you by: + +Jesper Peterson. + +jep@mtiame.mtia.oz.au (preferred, but 1 week turnaround) +jep@orca1.vic.design.telecom.au (that's orca<one>, 1 day turnaround) + +At least one of these addresses should be around for a while, even +though I don't work for either of the companies involved. + diff --git a/boehm-gc/README.debugging b/boehm-gc/README.debugging new file mode 100644 index 00000000000..f4dd65676aa --- /dev/null +++ b/boehm-gc/README.debugging @@ -0,0 +1,68 @@ +Debugging suggestions: + +****If you get a segmentation fault or bus error while debugging with a debugger: +If the fault occurred in GC_find_limit, or with incremental collection enabled, this is probably normal. The collector installs handlers to take care of these. You will not see these unless you are using a debugger. Your debugger should allow you to continue. It's preferable to tell the debugger to ignore SIGBUS and SIGSEGV ("handle" in gdb, "ignore" in most versions of dbx) and set a breakpoint in abort. The collector will call abort if the signal had another cause, and there was not other handler previously installed. I recommend debugging without incremental collection if possible. (This applies directly to UNIX systems. Debugging with incremental collection under win32 is worse. See README.win32.) + +****If you get warning messages informing you that the collector needed to allocate blacklisted blocks: + +0) Ignore these warnings while you are using GC_DEBUG. Some of the routines mentioned below don't have debugging equivalents. (Alternatively, write the missing routines and send them to me.) + +1) Replace allocator calls that request large blocks with calls to GC_malloc_ignore_off_page or GC_malloc_atomic_ignore_off_page. You may want to set a breakpoint in GC_default_warn_proc to help you identify such calls. Make sure that a pointer to somewhere near the beginning of the resulting block is maintained in a (preferably volatile) variable as long as the block is needed. + +2) If the large blocks are allocated with realloc, I suggest instead allocating them with something like the following. Note that the realloc size increment should be fairly large (e.g. a factor of 3/2) for this to exhibit reasonable performance. But we all know we should do that anyway. + +void * big_realloc(void *p, size_t new_size) +{ + size_t old_size = GC_size(p); + void * result; + + if (new_size <= 10000) return(GC_realloc(p, new_size)); + if (new_size <= old_size) return(p); + result = GC_malloc_ignore_off_page(new_size); + if (result == 0) return(0); + memcpy(result,p,old_size); + GC_free(p); + return(result); +} + +3) In the unlikely case that even relatively small object (<20KB) allocations are triggering these warnings, then your address space contains lots of "bogus pointers", i.e. values that appear to be pointers but aren't. Usually this can be solved by using GC_malloc_atomic or the routines in gc_typed.h to allocate large pointerfree regions of bitmaps, etc. Sometimes the problem can be solved with trivial changes of encoding in certain values. It is possible, though not pleasant, to identify the source of the bogus pointers by setting a breakpoint in GC_add_to_black_list_stack, and looking at the value of current_p in the GC_mark_from_mark_stack frame. Current_p contains the address of the bogus pointer. + +4) If you get only a fixed number of these warnings, you are probably only introducing a bounded leak by ignoring them. If the data structures being allocated are intended to be permanent, then it is also safe to ignore them. The warnings can be turned off by calling GC_set_warn_proc with a procedure that ignores these warnings (e.g. by doing absolutely nothing). + + +****If the collector dies in GC_malloc while trying to remove a free list element: + +1) With > 99% probability, you wrote past the end of an allocated object. Try setting GC_DEBUG and using the debugging facilities in gc.h. + + +****If the heap grows too much: + +1) Consider using GC_malloc_atomic for objects containing nonpointers. This is especially important for large arrays containg compressed data, pseudo-random numbers, and the like. (This isn't all that likely to solve your problem, but it's a useful and easy optimization anyway, and this is a good time to try it.) If you allocate large objects containg only one or two pointers at the beginning, either try the typed allocation primitives is gc.h, or separate out the pointerfree component. +2) If you are using the collector in its default mode, with interior pointer recognition enabled, consider using GC_malloc_ignore_off_page to allocate large objects. (See gc.h and above for details. Large means > 100K in most environments.) +3) GC_print_block_list() will print a list of all currently allocated heap blocks and what size objects they contain. GC_print_hblkfreelist() will print a list of free heap blocks, and whether they are blacklisted. GC_dump calls both of these, and also prints information about heap sections, and root segments. +4) Build the collector with -DKEEP_BACK_PTRS, and use the backptr.h +interface to determine why objects are being retained. + + +****If the collector appears to be losing objects: + +1) Replace all calls to GC_malloc_atomic and typed allocation by GC_malloc calls. If this fixes the problem, gradually reinsert your optimizations. +2) You may also want to try the safe(r) pointer manipulation primitives in gc.h. But those are hard to use until the preprocessor becomes available. +3) Try using the GC_DEBUG facilities. This is less likely to be successful here than if the collector crashes. +[The rest of these are primarily for wizards. You shouldn't need them unless you're doing something really strange, or debugging a collector port.] +4) Don't turn on incremental collection. If that fixes the problem, suspect a bug in the dirty bit implementation. Try compiling with -DCHECKSUMS to check for modified, but supposedly clean, pages. +5) On a SPARC, in a single-threaded environment, GC_print_callers(GC_arrays._last_stack) prints a cryptic stack trace as of the time of the last collection. (You will need a debugger to decipher the result.) The question to ask then is "why should this object have been accessible at the time of the last collection? Where was a pointer to it stored?". This facility should be easy to add for some other collector ports (namely if it's easy to traverse stack frames), but will be hard for others. +6) "print *GC_find_header(p)" in dbx or gdb will print the garbage collector block header information associated with the object p (e.g. object size, etc.) +7) GC_is_marked(p) determines whether p is the base address of a marked object. Note that objects allocated since the last collection should not be marked, and that unmarked objects are reclaimed incrementally. It's usually most interesting to set a breakpoint in GC_finish_collection and then to determine how much of the damaged data structure is marked at that point. +8) Look at the tracing facility in mark.c. (Ignore this suggestion unless you are very familiar with collector internals.) +9) [From Melissa O'Neill:] +If you're using multiple threads, double check that all thread +creation goes through the GC_ wrapper functions rather than +calling the thread-creation functions themselves (e.g., +GC_pthread_create rather than pthread_create). The gc.h header +file includes suitable preprocessor definitions to accomplish +this mapping transparently -- the question is: are you including +it in all the modules that create threads? + + + diff --git a/boehm-gc/README.dj b/boehm-gc/README.dj new file mode 100644 index 00000000000..613bc423cb1 --- /dev/null +++ b/boehm-gc/README.dj @@ -0,0 +1,12 @@ +[Original version supplied by Xiaokun Zhu <xiaokun@aero.gla.ac.uk>] +[This version came mostly from Gary Leavens. ] + +Look first at Makefile.dj, and possibly change the definitions of +RM and MV if you don't have rm and mv installed. +Then use Makefile.dj to compile the garbage collector. +For example, you can do: + + make -f Makefile.dj test + +All the tests should work fine. + diff --git a/boehm-gc/README.hp b/boehm-gc/README.hp new file mode 100644 index 00000000000..072ba5386ac --- /dev/null +++ b/boehm-gc/README.hp @@ -0,0 +1,16 @@ +Dynamic loading support requires that executables be linked with -ldld. +The alternative is to build the collector without defining DYNAMIC_LOADING +in gcconfig.h and ensuring that all garbage collectable objects are +accessible without considering statically allocated variables in dynamic +libraries. + +The collector should compile with either plain cc or cc -Ae. CC -Aa +fails to define _HPUX_SOURCE and thus will not configure the collector +correctly. + +Incremental collection support was reccently added, and should now work. + +Thread support for HP/UX 11 Pthreads was also recently added. It is still +flakey in this release. (It has only been tested on a uniprocessor. Even +there some fraction of thread creation calls fail with a not-yet-understood +error return from sem_wait.) diff --git a/boehm-gc/README.linux b/boehm-gc/README.linux new file mode 100644 index 00000000000..e35e712ef95 --- /dev/null +++ b/boehm-gc/README.linux @@ -0,0 +1,68 @@ +See README.alpha for Linux on DEC AXP info. + +This file applies mostly to Linux/Intel IA32. Ports to Linux on an M68K +and PowerPC are also integrated. They should behave similarly, except that +the PowerPC port lacks incremental GC support, and it is unknown to what +extent the Linux threads code is functional. + +Incremental GC is supported on Intel IA32 and M68K. + +Dynamic libraries are supported on an ELF system. A static executable +should be linked with the gcc option "-Wl,-defsym,_DYNAMIC=0". + +The collector appears to work with Linux threads. We have seen +intermittent hangs in sem_wait. So far we have been unable to reproduce +these unless the process was being debugged or traced. Thus it's +possible that the only real issue is that the debugger loses +signals on rare occasions. + +The garbage collector uses SIGPWR and SIGXCPU if it is used with +Linux threads. These should not be touched by the client program. + +To use threads, you need to abide by the following requirements: + +1) You need to use LinuxThreads (which are included in libc6). + + The collector relies on some implementation details of the LinuxThreads + package. It is unlikely that this code will work on other + pthread implementations (in particular it will *not* work with + MIT pthreads). + +2) You must compile the collector with -DLINUX_THREADS and -D_REENTRANT + specified in the Makefile. + +3a) Every file that makes thread calls should define LINUX_THREADS and + _REENTRANT and then include gc.h. Gc.h redefines some of the + pthread primitives as macros which also provide the collector with + information it requires. + +3b) A new alternative to (3a) is to build the collector with + -DUSE_LD_WRAP, and to link the final program with + + (for ld) --wrap read --wrap dlopen --wrap pthread_create \ + --wrap pthread_join --wrap pthread_sigmask + + (for gcc) -Wl,--wrap -Wl,read -Wl,--wrap -Wl,dlopen -Wl,--wrap \ + -Wl,pthread_create -Wl,--wrap -Wl,pthread_join -Wl,--wrap \ + -Wl,pthread_sigmask + + In any case, _REENTRANT should be defined during compilation. + +4) Dlopen() disables collection during its execution. (It can't run + concurrently with the collector, since the collector looks at its + data structures. It can't acquire the allocator lock, since arbitrary + user startup code may run as part of dlopen().) Under unusual + conditions, this may cause unexpected heap growth. + +5) The combination of LINUX_THREADS, REDIRECT_MALLOC, and incremental + collection fails in seemingly random places. This hasn't been tracked + down yet, but is perhaps not completely astonishing. The thread package + uses malloc, and thus can presumably get SIGSEGVs while inside the + package. There is no real guarantee that signals are handled properly + at that point. + +6) Thread local storage may not be viewed as part of the root set by the + collector. This probably depends on the linuxthreads version. For the + time being, any collectable memory referenced by thread local storage should + also be referenced from elsewhere, or be allocated as uncollectable. + (This is really a bug that should be fixed somehow.) diff --git a/boehm-gc/README.rs6000 b/boehm-gc/README.rs6000 new file mode 100644 index 00000000000..f5630b20a32 --- /dev/null +++ b/boehm-gc/README.rs6000 @@ -0,0 +1,9 @@ +We have so far failed to find a good way to determine the stack base. +It is highly recommended that GC_stackbottom be set explicitly on program +startup. The supplied value sometimes causes failure under AIX 4.1, though +it appears to work under 3.X. HEURISTIC2 seems to work under 4.1, but +involves a substantial performance penalty, and will fail if there is +no limit on stack size. + +There is no thread support. (I assume recent versions of AIX provide +pthreads? I no longer have access to a machine ...) diff --git a/boehm-gc/README.sgi b/boehm-gc/README.sgi new file mode 100644 index 00000000000..e67124b5544 --- /dev/null +++ b/boehm-gc/README.sgi @@ -0,0 +1,41 @@ +Performance of the incremental collector can be greatly enhanced with +-DNO_EXECUTE_PERMISSION. + +The collector should run with all of the -32, -n32 and -64 ABIs. Remember to +define the AS macro in the Makefile to be "as -64", or "as -n32". + +If you use -DREDIRECT_MALLOC=GC_malloc with C++ code, your code should make +at least one explicit call to malloc instead of new to ensure that the proper +version of malloc is linked in. + +Sproc threads are not supported in this version, though there may exist other +ports. + +Pthreads support is provided. This requires that: + +1) You compile the collector with -DIRIX_THREADS specified in the Makefile. + +2) You have the latest pthreads patches installed. + +(Though the collector makes only documented pthread calls, +it relies on signal/threads interactions working just right in ways +that are not required by the standard. It is unlikely that this code +will run on other pthreads platforms. But please tell me if it does.) + +3) Every file that makes thread calls should define IRIX_THREADS and then +include gc.h. Gc.h redefines some of the pthread primitives as macros which +also provide the collector with information it requires. + +4) pthread_cond_wait and pthread_cond_timed_wait should be prepared for +premature wakeups. (I believe the pthreads and realted standards require this +anyway. Irix pthreads often terminate a wait if a signal arrives. +The garbage collector uses signals to stop threads.) + +5) It is expensive to stop a thread waiting in IO at the time the request is +initiated. Applications with many such threads may not exhibit acceptable +performance with the collector. (Increasing the heap size may help.) + +6) The collector should not be compiled with -DREDIRECT_MALLOC. This +confuses some library calls made by the pthreads implementation, which +expect the standard malloc. + diff --git a/boehm-gc/README.solaris2 b/boehm-gc/README.solaris2 new file mode 100644 index 00000000000..cb15e30a19c --- /dev/null +++ b/boehm-gc/README.solaris2 @@ -0,0 +1,62 @@ +The collector supports both incremental collection and threads under +Solaris 2. The incremental collector normally retrieves page dirty information +through the appropriate /proc calls. But it can also be configured +(by defining MPROTECT_VDB instead of PROC_VDB in gcconfig.h) to use mprotect +and signals. This may result in shorter pause times, but it is no longer +safe to issue arbitrary system calls that write to the heap. + +Under other UNIX versions, +the collector normally obtains memory through sbrk. There is some reason +to expect that this is not safe if the client program also calls the system +malloc, or especially realloc. The sbrk man page strongly suggests this is +not safe: "Many library routines use malloc() internally, so use brk() +and sbrk() only when you know that malloc() definitely will not be used by +any library routine." This doesn't make a lot of sense to me, since there +seems to be no documentation as to which routines can transitively call malloc. +Nonetheless, under Solaris2, the collector now (since 4.12) allocates +memory using mmap by default. (It defines USE_MMAP in gcconfig.h.) +You may want to reverse this decisions if you use -DREDIRECT_MALLOC=... + + +SOLARIS THREADS: + +The collector must be compiled with -DSOLARIS_THREADS to be thread safe. +It is also essential that gc.h be included in files that call thr_create, +thr_join, thr_suspend, thr_continue, or dlopen. Gc.h macro defines +these to also do GC bookkeeping, etc. Gc.h must be included with +SOLARIS_THREADS defined, otherwise these replacements are not visible. +A collector built in this way way only be used by programs that are +linked with the threads library. + +If you are using the Pthreads interface, also define _SOLARIS_PTHREADS. + +In this mode, the collector contains various workarounds for older Solaris +bugs. Mostly, these should not be noticeable unless you look at system +call traces. However, it cannot protect a guard page at the end of +a thread stack. If you know that you will only be running Solaris2.5 +or later, it should be possible to fix this by compiling the collector +with -DSOLARIS23_MPROTECT_BUG_FIXED. + +Since 5.0 alpha5, dlopen disables collection temporarily, +unless USE_PROC_FOR_LIBRARIES is defined. In some unlikely cases, this +can result in unpleasant heap growth. But it seems better than the +race/deadlock issues we had before. + +If solaris_threads are used on an X86 processor with malloc redirected to +GC_malloc, it is necessary to call GC_thr_init explicitly before forking the +first thread. (This avoids a deadlock arising from calling GC_thr_init +with the allocation lock held.) + +It appears that there is a problem in using gc_cpp.h in conjunction with +Solaris threads and Sun's C++ runtime. Apparently the overloaded new operator +is invoked by some iostream initialization code before threads are correctly +initialized. As a result, call to thr_self() in garbage collector +initialization segfaults. Currently the only known workaround is to not +invoke the garbage collector from a user defined global operator new, or to +have it invoke the garbage-collector's allocators only after main has started. +(Note that the latter requires a moderately expensive test in operator +delete.) + +Hans-J. Boehm +(The above contains my personal opinions, which are probably not shared +by anyone else.) diff --git a/boehm-gc/README.uts b/boehm-gc/README.uts new file mode 100644 index 00000000000..6be49667d7b --- /dev/null +++ b/boehm-gc/README.uts @@ -0,0 +1,2 @@ +Alistair Crooks supplied the port. He used Lexa C version 2.1.3 with +-Xa to compile. diff --git a/boehm-gc/README.win32 b/boehm-gc/README.win32 new file mode 100644 index 00000000000..d78816b555d --- /dev/null +++ b/boehm-gc/README.win32 @@ -0,0 +1,149 @@ +The collector has only been compiled under Windows NT, with the +original Microsoft SDK, with Visual C++ 2.0 and later, with +the GNU win32 environment, with Borland 4.5, and recently with +Watcom C. + +It runs under both win32s and win32, but with different semantics. +Under win32, all writable pages outside of the heaps and stack are +scanned for roots. Thus the collector sees pointers in DLL data +segments. Under win32s, only the main data segment is scanned. +(The main data segment should always be scanned. Under some +versions of win32s, other regions may also be scanned.) +Thus all accessible objects should be accessible from local variables +or variables in the main data segment. Alternatively, other data +segments (e.g. in DLLs) may be registered with the collector by +calling GC_init() and then GC_register_root_section(a), where +a is the address of some variable inside the data segment. (Duplicate +registrations are ignored, but not terribly quickly.) + +(There are two reasons for this. We didn't want to see many 16:16 +pointers. And the VirtualQuery call has different semantics under +the two systems, and under different versions of win32s.) + +The collector test program "gctest" is linked as a GUI application, +but does not open any windows. Its output appears in the file +"gc.log". It may be started from the file manager. The hour glass +cursor will appear as long as it's running. If it is started from the +command line, it will usually run in the background. Wait a few +minutes (a few seconds on a modern machine) before you check the output. +You should see either a failure indication or a "Collector appears to +work" message. + +The cord test program has not been ported (but should port +easily). A toy editor (cord/de.exe) based on cords (heavyweight +strings represented as trees) has been ported and is included. +It runs fine under either win32 or win32S. It serves as an example +of a true Windows application, except that it was written by a +nonexpert Windows programmer. (There are some peculiarities +in the way files are displayed. The <cr> is displayed explicitly +for standard DOS text files. As in the UNIX version, control +characters are displayed explicitly, but in this case as red text. +This may be suboptimal for some tastes and/or sets of default +window colors.) + +For Microsoft development tools, rename NT_MAKEFILE as +MAKEFILE. (Make sure that the CPU environment variable is defined +to be i386.) + +For GNU-win32, use the regular makefile, possibly after uncommenting +the line "include Makefile.DLLs". The latter should be necessary only +if you want to package the collector as a DLL. The GNU-win32 port is +believed to work only for b18, not b19, probably dues to linker changes +in b19. This is probably fixable with a different definition of +DATASTART and DATAEND in gcconfig.h. + +For Borland tools, use BCC_MAKEFILE. Note that +Borland's compiler defaults to 1 byte alignment in structures (-a1), +whereas Visual C++ appears to default to 8 byte alignment (/Zp8). +The garbage collector in its default configuration EXPECTS AT +LEAST 4 BYTE ALIGNMENT. Thus the BORLAND DEFAULT MUST +BE OVERRIDDEN. (In my opinion, it should usually be anyway. +I expect that -a1 introduces major performance penalties on a +486 or Pentium.) Note that this changes structure layouts. (As a last +resort, gcconfig.h can be changed to allow 1 byte alignment. But +this has significant negative performance implications.) +The Makefile is set up to assume Borland 4.5. If you have another +version, change the line near the top. By default, it does not +require the assembler. If you do have the assembler, I recommend +removing the -DUSE_GENERIC. + +Incremental collection support was recently added. This is +currently pretty simpleminded. Pages are protected. Protection +faults are caught by a handler installed at the bottom of the handler +stack. This is both slow and interacts poorly with a debugger. +Whenever possible, I recommend adding a call to +GC_enable_incremental at the last possible moment, after most +debugging is complete. Unlike the UNIX versions, no system +calls are wrapped by the collector itself. It may be necessary +to wrap ReadFile calls that use a buffer in the heap, so that the +call does not encounter a protection fault while it's running. +(As usual, none of this is an issue unless GC_enable_incremental +is called.) + +Note that incremental collection is disabled with -DSMALL_CONFIG, +which is the default for win32. If you need incremental collection, +undefine SMALL_CONFIG. + +Incremental collection is not supported under win32s, and it may not +be possible to do so. However, win32 applications that attempt to use +incremental collection should continue to run, since the +collector detects if it's running under win32s and turns calls to +GC_enable_incremental() into noops. + +James Clark has contributed the necessary code to support win32 threads. +This code is known to exhibit some problems with incremental collection +enabled. Use NT_THREADS_MAKEFILE (a.k.a gc.mak) instead of NT_MAKEFILE +to build this version. Note that this requires some files whose names +are more than 8 + 3 characters long. Thus you should unpack the tar file +so that long file names are preserved. To build the garbage collector +test with VC++ from the command line, use + +nmake /F ".\gc.mak" CFG="gctest - Win32 Release" + +This requires that the subdirectory gctest\Release exist. +The test program and DLL will reside in the Release directory. + +This version relies on the collector residing in a dll. + +This version currently supports incremental collection only if it is +enabled before any additional threads are created. +Version 4.13 attempts to fix some of the earlier problems, but there +may be other issues. If you need solid support for win32 threads, you +might check with Geodesic Systems. Their collector must be licensed, +but they have invested far more time in win32-specific issues. + +Hans + +Ivan V. Demakov's README for the Watcom port: + +The collector has been compiled with Watcom C 10.6 and 11.0. +It runs under win32, win32s, and even under msdos with dos4gw +dos-extender. It should also run under OS/2, though this isn't +tested. Under win32 the collector can be built either as dll +or as static library. + +Note that all compilations were done under Windows 95 or NT. +For unknown reason compiling under Windows 3.11 for NT (one +attempt has been made) leads to broken executables. + +Incremental collection is not supported. + +cord is not ported. + +Before compiling you may need to edit WCC_MAKEFILE to set target +platform, library type (dynamic or static), calling conventions, and +optimization options. + +To compile the collector and testing programs use the command: + wmake -f WCC_MAKEFILE + +All programs using gc should be compiled with 4-byte alignment. +For further explanations on this see comments about Borland. + +If gc compiled as dll, the macro ``GC_DLL'' should be defined before +including "gc.h" (for example, with -DGC_DLL compiler option). It's +important, otherwise resulting programs will not run. + +Ivan Demakov (email: ivan@tgrad.nsk.su) + + diff --git a/boehm-gc/SCoptions.amiga b/boehm-gc/SCoptions.amiga new file mode 100644 index 00000000000..a61e0cb1f04 --- /dev/null +++ b/boehm-gc/SCoptions.amiga @@ -0,0 +1,16 @@ +CPU=68030 +NOSTACKCHECK +OPTIMIZE +VERBOSE +MAPHUNK +NOVERSION +NOICONS +OPTIMIZERTIME +DEFINE SILENT +DEFINE AMIGA_SKIP_SEG +IGNORE=85 +IGNORE=154 +IGNORE=161 +IGNORE=100 +OPTIMIZERCOMPLEXITY=4 +OPTIMIZERDEPTH=3 diff --git a/boehm-gc/acinclude.m4 b/boehm-gc/acinclude.m4 deleted file mode 100644 index 55e649b3a24..00000000000 --- a/boehm-gc/acinclude.m4 +++ /dev/null @@ -1,153 +0,0 @@ -# FIXME: We temporarily define our own version of AC_PROG_CC. This is -# copied from autoconf 2.12, but does not call AC_PROG_CC_WORKS. We -# are probably using a cross compiler, which will not be able to fully -# link an executable. 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Usually the client will first force + * a full collection and then gather information, preferably + * before much intervening allocation. + * + * The implementation of the interface is only about 99.9999% + * correct. It is intended to be good enough for profiling, + * but is not intended to be used with production code. + * + * Results are likely to be much more useful if all allocation is + * accomplished through the debugging allocators. + * + * The implementation idea is due to A. Demers. + */ + +/* Store information about the object referencing dest in *base_p */ +/* and *offset_p. */ +/* If multiple objects or roots point to dest, the one reported */ +/* will be the last on used by the garbage collector to trace the */ +/* object. */ +/* source is root ==> *base_p = address, *offset_p = 0 */ +/* source is heap object ==> *base_p != 0, *offset_p = offset */ +/* Returns 1 on success, 0 if source couldn't be determined. */ +/* Dest can be any address within a heap object. */ +typedef enum { GC_UNREFERENCED, /* No reference info available. */ + GC_NO_SPACE, /* Dest not allocated with debug alloc */ + GC_REFD_FROM_ROOT, /* Referenced directly by root *base_p */ + GC_REFD_FROM_REG, /* Referenced from a register, i.e. */ + /* a root without an address. */ + GC_REFD_FROM_HEAP, /* Referenced from another heap obj. */ + GC_FINALIZER_REFD /* Finalizable and hence accessible. */ +} GC_ref_kind; + +GC_ref_kind GC_get_back_ptr_info(void *dest, void **base_p, size_t *offset_p); + +/* Generate a random heap address. */ +/* The resulting address is in the heap, but */ +/* not necessarily inside a valid object. */ +void * GC_generate_random_heap_address(void); + +/* Generate a random address inside a valid marked heap object. */ +void * GC_generate_random_valid_address(void); + +/* Force a garbage collection and generate a backtrace from a */ +/* random heap address. */ +/* This uses the GC logging mechanism (GC_printf) to produce */ +/* output. It can often be called from a debugger. The */ +/* source in dbg_mlc.c also serves as a sample client. */ +void GC_generate_random_backtrace(void); + +/* Print a backtrace from a specific address. Used by the */ +/* above. The client should call GC_gcollect() immediately */ +/* before invocation. */ +void GC_print_backtrace(void *); + + diff --git a/boehm-gc/barrett_diagram b/boehm-gc/barrett_diagram new file mode 100644 index 00000000000..27e80dc15cd --- /dev/null +++ b/boehm-gc/barrett_diagram @@ -0,0 +1,106 @@ +This is an ASCII diagram of the data structure used to check pointer +validity. It was provided by Dave Barrett <barrett@asgard.cs.colorado.edu>, +and should be of use to others attempting to understand the code. +The data structure in GC4.X is essentially the same. -HB + + + + + Data Structure used by GC_base in gc3.7: + 21-Apr-94 + + + + + 63 LOG_TOP_SZ[11] LOG_BOTTOM_SZ[10] LOG_HBLKSIZE[13] + +------------------+----------------+------------------+------------------+ + p:| | TL_HASH(hi) | | HBLKDISPL(p) | + +------------------+----------------+------------------+------------------+ + \-----------------------HBLKPTR(p)-------------------/ + \------------hi-------------------/ + \______ ________/ \________ _______/ \________ _______/ + V V V + | | | + GC_top_index[] | | | + --- +--------------+ | | | + ^ | | | | | + | | | | | | + TOP +--------------+<--+ | | + _SZ +-<| [] | * | | +(items)| +--------------+ if 0 < bi< HBLKSIZE | | + | | | | then large object | | + | | | | starts at the bi'th | | + v | | | HBLK before p. | i | + --- | +--------------+ | (word- | + v | aligned) | + bi= |GET_BI(p){->hash_link}->key==hi | | + v | | + | (bottom_index) \ scratch_alloc'd | | + | ( struct bi ) / by get_index() | | + --- +->+--------------+ | | + ^ | | | | + ^ | | | | + BOTTOM | | ha=GET_HDR_ADDR(p) | | +_SZ(items)+--------------+<----------------------+ +-------+ + | +--<| index[] | | + | | +--------------+ GC_obj_map: v + | | | | from / +-+-+-----+-+-+-+-+ --- + v | | | GC_add < 0| | | | | | | | ^ + --- | +--------------+ _map_entry \ +-+-+-----+-+-+-+-+ | + | | asc_link | +-+-+-----+-+-+-+-+ MAXOBJSZ + | +--------------+ +-->| | | j | | | | | +1 + | | key | | +-+-+-----+-+-+-+-+ | + | +--------------+ | +-+-+-----+-+-+-+-+ | + | | hash_link | | | | | | | | | | v + | +--------------+ | +-+-+-----+-+-+-+-+ --- + | | |<--MAX_OFFSET--->| + | | (bytes) +HDR(p)| GC_find_header(p) | |<--MAP_ENTRIES-->| + | \ from | =HBLKSIZE/WORDSZ + | (hdr) (struct hblkhdr) / alloc_hdr() | (1024 on Alpha) + +-->+----------------------+ | (8/16 bits each) +GET_HDR(p)| word hb_sz (words) | | + +----------------------+ | + | struct hblk *hb_next | | + +----------------------+ | + |mark_proc hb_mark_proc| | + +----------------------+ | + | char * hb_map |>-------------+ + +----------------------+ + | ushort hb_obj_kind | + +----------------------+ + | hb_last_reclaimed | + --- +----------------------+ + ^ | | + MARK_BITS| hb_marks[] | *if hdr is free, hb_sz + DISCARD_WORDS +_SZ(words)| | is the size of a heap chunk (struct hblk) + v | | of at least MININCR*HBLKSIZE bytes (below), + --- +----------------------+ otherwise, size of each object in chunk. + +Dynamic data structures above are interleaved throughout the heap in blocks of +size MININCR * HBLKSIZE bytes as done by gc_scratch_alloc which cannot be +freed; free lists are used (e.g. alloc_hdr). HBLKs's below are collected. + + (struct hblk) + --- +----------------------+ < HBLKSIZE --- --- DISCARD_ + ^ |garbage[DISCARD_WORDS]| aligned ^ ^ HDR_BYTES WORDS + | | | | v (bytes) (words) + | +-----hb_body----------+ < WORDSZ | --- --- + | | | aligned | ^ ^ + | | Object 0 | | hb_sz | + | | | i |(word- (words)| + | | | (bytes)|aligned) v | + | + - - - - - - - - - - -+ --- | --- | + | | | ^ | ^ | + n * | | j (words) | hb_sz BODY_SZ + HBLKSIZE | Object 1 | v v | (words) + (bytes) | |--------------- v MAX_OFFSET + | + - - - - - - - - - - -+ --- (bytes) + | | | !All_INTERIOR_PTRS ^ | + | | | sets j only for hb_sz | + | | Object N | valid object offsets. | | + v | | All objects WORDSZ v v + --- +----------------------+ aligned. --- --- + +DISCARD_WORDS is normally zero. Indeed the collector has not been tested +with another value in ages. diff --git a/boehm-gc/configure b/boehm-gc/configure deleted file mode 100755 index cbbc4d236d5..00000000000 --- a/boehm-gc/configure +++ /dev/null @@ -1,2189 +0,0 @@ -#! /bin/sh - -# Guess values for system-dependent variables and create Makefiles. -# Generated automatically using autoconf version 2.13 -# Copyright (C) 1992, 93, 94, 95, 96 Free Software Foundation, Inc. -# -# This configure script is free software; the Free Software Foundation -# gives unlimited permission to copy, distribute and modify it. - -# Defaults: -ac_help= -ac_default_prefix=/usr/local -# Any additions from configure.in: -ac_help="$ac_help - --enable-multilib build many library versions (default)" -ac_help="$ac_help - --enable-maintainer-mode enable make rules and dependencies not useful - (and sometimes confusing) to the casual installer" -ac_help="$ac_help - --with-target-subdir=SUBDIR Configuring with a cross compiler" -ac_help="$ac_help - --with-cross-host=HOST Configuring with a cross compiler" -ac_help="$ac_help - --enable-maintainer-mode enable make rules and dependencies not useful - (and sometimes confusing) to the casual installer" -ac_help="$ac_help - --enable-threads=TYPE choose threading package" -ac_help="$ac_help - --enable-java-gc=TYPE choose garbage collector [boehm]" -ac_help="$ac_help - --with-ecos Enable runtime eCos target support." - -# Initialize some variables set by options. -# The variables have the same names as the options, with -# dashes changed to underlines. -build=NONE -cache_file=./config.cache -exec_prefix=NONE -host=NONE -no_create= -nonopt=NONE -no_recursion= -prefix=NONE -program_prefix=NONE -program_suffix=NONE -program_transform_name=s,x,x, -silent= -site= -srcdir= -target=NONE -verbose= -x_includes=NONE -x_libraries=NONE -bindir='${exec_prefix}/bin' -sbindir='${exec_prefix}/sbin' -libexecdir='${exec_prefix}/libexec' -datadir='${prefix}/share' -sysconfdir='${prefix}/etc' -sharedstatedir='${prefix}/com' -localstatedir='${prefix}/var' -libdir='${exec_prefix}/lib' -includedir='${prefix}/include' -oldincludedir='/usr/include' -infodir='${prefix}/info' -mandir='${prefix}/man' - -# Initialize some other variables. -subdirs= -MFLAGS= MAKEFLAGS= -SHELL=${CONFIG_SHELL-/bin/sh} -# Maximum number of lines to put in a shell here document. -ac_max_here_lines=12 - -ac_prev= -for ac_option -do - - # If the previous option needs an argument, assign it. - if test -n "$ac_prev"; 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So we fool automake here. -if test "x" = "y"; then - AC_EXEEXT -fi - -AC_MSG_CHECKING([for threads package to use]) -AC_ARG_ENABLE(threads, [ --enable-threads=TYPE choose threading package], - THREADS=$enableval, - dnl FIXME: figure out native threads to use here. - THREADS=no) - -if test "$THREADS" = yes; then - case "$host" in - *-*-vxworks*) - THREADS=vxworks - ;; - *-*-linux*) - # FIXME: this isn't correct in all cases. - THREADS=posix - ;; - *-*-win*) - THREADS=win32 - ;; - *-*-irix*) - THREADS=irix - ;; - *-*-solaris*) - # FIXME: for now, choose POSIX, because we implement that. - # Later, choose solaris threads. - THREADS=posix - ;; - *) - # For now. - THREADS=none - ;; - esac -fi - -INCLUDES= -case "$THREADS" in - no | none | single) - THREADS=none - ;; - posix | pthreads) - THREADS=posix - case "$host" in - *-*-linux*) - AC_DEFINE(LINUX_THREADS) - AC_DEFINE(_REENTRANT) - ;; - *-*-solaris*) - AC_DEFINE(SOLARIS_THREADS) - AC_DEFINE(_SOLARIS_PTHREADS) - ;; - esac - ;; - qt) - AC_DEFINE(QUICK_THREADS) - INCLUDES="-I${boehm_gc_basedir}/../qthreads" - ;; - decosf1 | irix | mach | os2 | solaris | win32 | dce | vxworks) - AC_MSG_ERROR(thread package $THREADS not yet supported) - ;; - *) - AC_MSG_ERROR($THREADS is an unknown thread package) - ;; -esac -AC_MSG_RESULT($THREADS) - -AC_ARG_ENABLE(java-gc, -changequote(<<,>>)dnl -<< --enable-java-gc=TYPE choose garbage collector [boehm]>>, -changequote([,]) - GC=$enableval, - GC=boehm) -target_all= -if test "$GC" = "boehm"; then - target_all=libgcjgc.a -fi -AC_SUBST(target_all) - -dnl If the target is an eCos system, use the appropriate eCos -dnl I/O routines. -dnl FIXME: this should not be a local option but a global target -dnl system; at present there is no eCos target. -TARGET_ECOS="no" -AC_ARG_WITH(ecos, -[ --with-ecos Enable runtime eCos target support.], -TARGET_ECOS="$with_ecos" -) - -addobjs= -CXXINCLUDES= -case "$TARGET_ECOS" in - no) - ;; - *) - AC_DEFINE(ECOS) - CXXINCLUDES="-I${TARGET_ECOS}/include" - addobjs="$addobjs ecos.o" - ;; -esac -AC_SUBST(CXX) - -AC_SUBST(INCLUDES) -AC_SUBST(CXXINCLUDES) - -machdep= -case "$host" in - mipstx39-*-elf*) - machdep="mips_ultrix_mach_dep.o" - AC_DEFINE(STACKBASE, __stackbase) - AC_DEFINE(DATASTART_IS_ETEXT) - ;; - sparc-sun-solaris2.3*) - AC_DEFINE(SUNOS53_SHARED_LIB) - ;; -esac -if test x"$machdep" = x; then - machdep="mach_dep.o" -fi -addobjs="$addobjs $machdep" -AC_SUBST(addobjs) - -dnl As of 4.13a2, the collector will not properly work on Solaris when -dnl built with gcc and -O. So we remove -O in the appropriate case. -case "$host" in - sparc-sun-solaris2*) - if test "$GCC" = yes; then - new_CFLAGS= - for i in $CFLAGS; do - case "$i" in - -O*) - ;; - *) - new_CFLAGS="$new_CFLAGS $i" - ;; - esac - done - CFLAGS="$new_CFLAGS" - fi - ;; -esac - -dnl We need to override the top-level CFLAGS. This is how we do it. -MY_CFLAGS="$CFLAGS" -AC_SUBST(MY_CFLAGS) - -dnl Define a few things to retarget the library towards -dnl embedded Java. -AC_DEFINE(SILENT) -AC_DEFINE(NO_SIGNALS) -AC_DEFINE(NO_DEBUGGING) -AC_DEFINE(JAVA_FINALIZATION) - -dnl Create boehm-config.h so that libjava can find it. -dnl It is required to use gc_priv.h, which is required to write -dnl a new marking function. So config.h in this package is -dnl poorly named. -AC_LINK_FILES(config.h, boehm-config.h) - -dnl This is something of a hack. When cross-compiling we turn off -dnl some functionality. We also enable the "small" configuration. -dnl These is only correct when targetting an embedded system. FIXME. -if test -n "${with_cross_host}"; then - AC_DEFINE(NO_SIGSET) - AC_DEFINE(NO_CLOCK) - AC_DEFINE(SMALL_CONFIG) -fi - -if test "${multilib}" = "yes"; then - multilib_arg="--enable-multilib" -else - multilib_arg= -fi - -AC_OUTPUT(Makefile, -[ -dnl Put all the -D options in a file. These are required before -dnl boehm-config.h can be included. This is a huge hack brought -dnl about by overall poor structuring of this entire library. -echo "$DEFS" > boehm-cflags - -if test -n "$CONFIG_FILES"; then - ac_file=Makefile . ${boehm_gc_basedir}/../config-ml.in -fi], -srcdir=${srcdir} -host=${host} -target=${target} -with_multisubdir=${with_multisubdir} -ac_configure_args="${multilib_arg} ${ac_configure_args}" -CONFIG_SHELL=${CONFIG_SHELL-/bin/sh} -boehm_gc_basedir=${boehm_gc_basedir} -CC="${CC}" -DEFS="$DEFS" -) diff --git a/boehm-gc/cord/README b/boehm-gc/cord/README new file mode 100644 index 00000000000..62101452313 --- /dev/null +++ b/boehm-gc/cord/README @@ -0,0 +1,31 @@ +Copyright (c) 1993-1994 by Xerox Corporation. All rights reserved. + +THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED +OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + +Permission is hereby granted to use or copy this program +for any purpose, provided the above notices are retained on all copies. +Permission to modify the code and to distribute modified code is granted, +provided the above notices are retained, and a notice that the code was +modified is included with the above copyright notice. + +Please send bug reports to Hans-J. Boehm (boehm@sgi.com). + +This is a string packages that uses a tree-based representation. +See cord.h for a description of the functions provided. Ec.h describes +"extensible cords", which are essentially output streams that write +to a cord. These allow for efficient construction of cords without +requiring a bound on the size of a cord. + +de.c is a very dumb text editor that illustrates the use of cords. +It maintains a list of file versions. Each version is simply a +cord representing the file contents. Nonetheless, standard +editing operations are efficient, even on very large files. +(Its 3 line "user manual" can be obtained by invoking it without +arguments. Note that ^R^N and ^R^P move the cursor by +almost a screen. It does not understand tabs, which will show +up as highlighred "I"s. Use the UNIX "expand" program first.) +To build the editor, type "make cord/de" in the gc directory. + +This package assumes an ANSI C compiler such as gcc. It will +not compile with an old-style K&R compiler. diff --git a/boehm-gc/cord/SCOPTIONS.amiga b/boehm-gc/cord/SCOPTIONS.amiga new file mode 100644 index 00000000000..2a091970b8b --- /dev/null +++ b/boehm-gc/cord/SCOPTIONS.amiga @@ -0,0 +1,14 @@ +MATH=STANDARD +CPU=68030 +NOSTACKCHECK +OPTIMIZE +VERBOSE +NOVERSION +NOICONS +OPTIMIZERTIME +INCLUDEDIR=/ +DEFINE AMIGA +LIBRARY=cord.lib +LIBRARY=/gc.lib +IGNORE=100 +IGNORE=161 diff --git a/boehm-gc/cord/SMakefile.amiga b/boehm-gc/cord/SMakefile.amiga new file mode 100644 index 00000000000..5aef131e606 --- /dev/null +++ b/boehm-gc/cord/SMakefile.amiga @@ -0,0 +1,20 @@ +# Makefile for cord.lib +# Michel Schinz 1994/07/20 + +OBJS = cordbscs.o cordprnt.o cordxtra.o + +all: cord.lib cordtest + +cordbscs.o: cordbscs.c +cordprnt.o: cordprnt.c +cordxtra.o: cordxtra.c +cordtest.o: cordtest.c + +cord.lib: $(OBJS) + oml cord.lib r $(OBJS) + +cordtest: cordtest.o cord.lib + sc cordtest.o link + +clean: + delete cord.lib cordtest \#?.o \#?.lnk diff --git a/boehm-gc/cord/cord.h b/boehm-gc/cord/cord.h new file mode 100644 index 00000000000..926089e86fb --- /dev/null +++ b/boehm-gc/cord/cord.h @@ -0,0 +1,327 @@ +/* + * Copyright (c) 1993-1994 by Xerox Corporation. All rights reserved. + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + * + * Author: Hans-J. Boehm (boehm@parc.xerox.com) + */ +/* Boehm, October 5, 1995 4:20 pm PDT */ + +/* + * Cords are immutable character strings. A number of operations + * on long cords are much more efficient than their strings.h counterpart. + * In particular, concatenation takes constant time independent of the length + * of the arguments. (Cords are represented as trees, with internal + * nodes representing concatenation and leaves consisting of either C + * strings or a functional description of the string.) + * + * The following are reasonable applications of cords. They would perform + * unacceptably if C strings were used: + * - A compiler that produces assembly language output by repeatedly + * concatenating instructions onto a cord representing the output file. + * - A text editor that converts the input file to a cord, and then + * performs editing operations by producing a new cord representing + * the file after echa character change (and keeping the old ones in an + * edit history) + * + * For optimal performance, cords should be built by + * concatenating short sections. + * This interface is designed for maximum compatibility with C strings. + * ASCII NUL characters may be embedded in cords using CORD_from_fn. + * This is handled correctly, but CORD_to_char_star will produce a string + * with embedded NULs when given such a cord. + * + * This interface is fairly big, largely for performance reasons. + * The most basic constants and functions: + * + * CORD - the type of a cord; + * CORD_EMPTY - empty cord; + * CORD_len(cord) - length of a cord; + * CORD_cat(cord1,cord2) - concatenation of two cords; + * CORD_substr(cord, start, len) - substring (or subcord); + * CORD_pos i; CORD_FOR(i, cord) { ... CORD_pos_fetch(i) ... } - + * examine each character in a cord. CORD_pos_fetch(i) is the char. + * CORD_fetch(int i) - Retrieve i'th character (slowly). + * CORD_cmp(cord1, cord2) - compare two cords. + * CORD_from_file(FILE * f) - turn a read-only file into a cord. + * CORD_to_char_star(cord) - convert to C string. + * (Non-NULL C constant strings are cords.) + * CORD_printf (etc.) - cord version of printf. Use %r for cords. + */ +# ifndef CORD_H + +# define CORD_H +# include <stddef.h> +# include <stdio.h> +/* Cords have type const char *. This is cheating quite a bit, and not */ +/* 100% portable. But it means that nonempty character string */ +/* constants may be used as cords directly, provided the string is */ +/* never modified in place. The empty cord is represented by, and */ +/* can be written as, 0. */ + +typedef const char * CORD; + +/* An empty cord is always represented as nil */ +# define CORD_EMPTY 0 + +/* Is a nonempty cord represented as a C string? */ +#define CORD_IS_STRING(s) (*(s) != '\0') + +/* Concatenate two cords. If the arguments are C strings, they may */ +/* not be subsequently altered. */ +CORD CORD_cat(CORD x, CORD y); + +/* Concatenate a cord and a C string with known length. Except for the */ +/* empty string case, this is a special case of CORD_cat. Since the */ +/* length is known, it can be faster. */ +/* The string y is shared with the resulting CORD. Hence it should */ +/* not be altered by the caller. */ +CORD CORD_cat_char_star(CORD x, const char * y, size_t leny); + +/* Compute the length of a cord */ +size_t CORD_len(CORD x); + +/* Cords may be represented by functions defining the ith character */ +typedef char (* CORD_fn)(size_t i, void * client_data); + +/* Turn a functional description into a cord. */ +CORD CORD_from_fn(CORD_fn fn, void * client_data, size_t len); + +/* Return the substring (subcord really) of x with length at most n, */ +/* starting at position i. (The initial character has position 0.) */ +CORD CORD_substr(CORD x, size_t i, size_t n); + +/* Return the argument, but rebalanced to allow more efficient */ +/* character retrieval, substring operations, and comparisons. */ +/* This is useful only for cords that were built using repeated */ +/* concatenation. Guarantees log time access to the result, unless */ +/* x was obtained through a large number of repeated substring ops */ +/* or the embedded functional descriptions take longer to evaluate. */ +/* May reallocate significant parts of the cord. The argument is not */ +/* modified; only the result is balanced. */ +CORD CORD_balance(CORD x); + +/* The following traverse a cord by applying a function to each */ +/* character. This is occasionally appropriate, especially where */ +/* speed is crucial. But, since C doesn't have nested functions, */ +/* clients of this sort of traversal are clumsy to write. Consider */ +/* the functions that operate on cord positions instead. */ + +/* Function to iteratively apply to individual characters in cord. */ +typedef int (* CORD_iter_fn)(char c, void * client_data); + +/* Function to apply to substrings of a cord. Each substring is a */ +/* a C character string, not a general cord. */ +typedef int (* CORD_batched_iter_fn)(const char * s, void * client_data); +# define CORD_NO_FN ((CORD_batched_iter_fn)0) + +/* Apply f1 to each character in the cord, in ascending order, */ +/* starting at position i. If */ +/* f2 is not CORD_NO_FN, then multiple calls to f1 may be replaced by */ +/* a single call to f2. The parameter f2 is provided only to allow */ +/* some optimization by the client. This terminates when the right */ +/* end of this string is reached, or when f1 or f2 return != 0. In the */ +/* latter case CORD_iter returns != 0. Otherwise it returns 0. */ +/* The specified value of i must be < CORD_len(x). */ +int CORD_iter5(CORD x, size_t i, CORD_iter_fn f1, + CORD_batched_iter_fn f2, void * client_data); + +/* A simpler version that starts at 0, and without f2: */ +int CORD_iter(CORD x, CORD_iter_fn f1, void * client_data); +# define CORD_iter(x, f1, cd) CORD_iter5(x, 0, f1, CORD_NO_FN, cd) + +/* Similar to CORD_iter5, but end-to-beginning. No provisions for */ +/* CORD_batched_iter_fn. */ +int CORD_riter4(CORD x, size_t i, CORD_iter_fn f1, void * client_data); + +/* A simpler version that starts at the end: */ +int CORD_riter(CORD x, CORD_iter_fn f1, void * client_data); + +/* Functions that operate on cord positions. The easy way to traverse */ +/* cords. A cord position is logically a pair consisting of a cord */ +/* and an index into that cord. But it is much faster to retrieve a */ +/* charcter based on a position than on an index. Unfortunately, */ +/* positions are big (order of a few 100 bytes), so allocate them with */ +/* caution. */ +/* Things in cord_pos.h should be treated as opaque, except as */ +/* described below. Also note that */ +/* CORD_pos_fetch, CORD_next and CORD_prev have both macro and function */ +/* definitions. The former may evaluate their argument more than once. */ +# include "private/cord_pos.h" + +/* + Visible definitions from above: + + typedef <OPAQUE but fairly big> CORD_pos[1]; + + * Extract the cord from a position: + CORD CORD_pos_to_cord(CORD_pos p); + + * Extract the current index from a position: + size_t CORD_pos_to_index(CORD_pos p); + + * Fetch the character located at the given position: + char CORD_pos_fetch(CORD_pos p); + + * Initialize the position to refer to the given cord and index. + * Note that this is the most expensive function on positions: + void CORD_set_pos(CORD_pos p, CORD x, size_t i); + + * Advance the position to the next character. + * P must be initialized and valid. + * Invalidates p if past end: + void CORD_next(CORD_pos p); + + * Move the position to the preceding character. + * P must be initialized and valid. + * Invalidates p if past beginning: + void CORD_prev(CORD_pos p); + + * Is the position valid, i.e. inside the cord? + int CORD_pos_valid(CORD_pos p); +*/ +# define CORD_FOR(pos, cord) \ + for (CORD_set_pos(pos, cord, 0); CORD_pos_valid(pos); CORD_next(pos)) + + +/* An out of memory handler to call. May be supplied by client. */ +/* Must not return. */ +extern void (* CORD_oom_fn)(void); + +/* Dump the representation of x to stdout in an implementation defined */ +/* manner. Intended for debugging only. */ +void CORD_dump(CORD x); + +/* The following could easily be implemented by the client. They are */ +/* provided in cordxtra.c for convenience. */ + +/* Concatenate a character to the end of a cord. */ +CORD CORD_cat_char(CORD x, char c); + +/* Concatenate n cords. */ +CORD CORD_catn(int n, /* CORD */ ...); + +/* Return the character in CORD_substr(x, i, 1) */ +char CORD_fetch(CORD x, size_t i); + +/* Return < 0, 0, or > 0, depending on whether x < y, x = y, x > y */ +int CORD_cmp(CORD x, CORD y); + +/* A generalization that takes both starting positions for the */ +/* comparison, and a limit on the number of characters to be compared. */ +int CORD_ncmp(CORD x, size_t x_start, CORD y, size_t y_start, size_t len); + +/* Find the first occurrence of s in x at position start or later. */ +/* Return the position of the first character of s in x, or */ +/* CORD_NOT_FOUND if there is none. */ +size_t CORD_str(CORD x, size_t start, CORD s); + +/* Return a cord consisting of i copies of (possibly NUL) c. Dangerous */ +/* in conjunction with CORD_to_char_star. */ +/* The resulting representation takes constant space, independent of i. */ +CORD CORD_chars(char c, size_t i); +# define CORD_nul(i) CORD_chars('\0', (i)) + +/* Turn a file into cord. The file must be seekable. Its contents */ +/* must remain constant. The file may be accessed as an immediate */ +/* result of this call and/or as a result of subsequent accesses to */ +/* the cord. Short files are likely to be immediately read, but */ +/* long files are likely to be read on demand, possibly relying on */ +/* stdio for buffering. */ +/* We must have exclusive access to the descriptor f, i.e. we may */ +/* read it at any time, and expect the file pointer to be */ +/* where we left it. Normally this should be invoked as */ +/* CORD_from_file(fopen(...)) */ +/* CORD_from_file arranges to close the file descriptor when it is no */ +/* longer needed (e.g. when the result becomes inaccessible). */ +/* The file f must be such that ftell reflects the actual character */ +/* position in the file, i.e. the number of characters that can be */ +/* or were read with fread. On UNIX systems this is always true. On */ +/* MS Windows systems, f must be opened in binary mode. */ +CORD CORD_from_file(FILE * f); + +/* Equivalent to the above, except that the entire file will be read */ +/* and the file pointer will be closed immediately. */ +/* The binary mode restriction from above does not apply. */ +CORD CORD_from_file_eager(FILE * f); + +/* Equivalent to the above, except that the file will be read on demand.*/ +/* The binary mode restriction applies. */ +CORD CORD_from_file_lazy(FILE * f); + +/* Turn a cord into a C string. The result shares no structure with */ +/* x, and is thus modifiable. */ +char * CORD_to_char_star(CORD x); + +/* Turn a C string into a CORD. The C string is copied, and so may */ +/* subsequently be modified. */ +CORD CORD_from_char_star(const char *s); + +/* Identical to the above, but the result may share structure with */ +/* the argument and is thus not modifiable. */ +const char * CORD_to_const_char_star(CORD x); + +/* Write a cord to a file, starting at the current position. No */ +/* trailing NULs are newlines are added. */ +/* Returns EOF if a write error occurs, 1 otherwise. */ +int CORD_put(CORD x, FILE * f); + +/* "Not found" result for the following two functions. */ +# define CORD_NOT_FOUND ((size_t)(-1)) + +/* A vague analog of strchr. Returns the position (an integer, not */ +/* a pointer) of the first occurrence of (char) c inside x at position */ +/* i or later. The value i must be < CORD_len(x). */ +size_t CORD_chr(CORD x, size_t i, int c); + +/* A vague analog of strrchr. Returns index of the last occurrence */ +/* of (char) c inside x at position i or earlier. The value i */ +/* must be < CORD_len(x). */ +size_t CORD_rchr(CORD x, size_t i, int c); + + +/* The following are also not primitive, but are implemented in */ +/* cordprnt.c. They provide functionality similar to the ANSI C */ +/* functions with corresponding names, but with the following */ +/* additions and changes: */ +/* 1. A %r conversion specification specifies a CORD argument. Field */ +/* width, precision, etc. have the same semantics as for %s. */ +/* (Note that %c,%C, and %S were already taken.) */ +/* 2. The format string is represented as a CORD. */ +/* 3. CORD_sprintf and CORD_vsprintf assign the result through the 1st */ /* argument. Unlike their ANSI C versions, there is no need to guess */ +/* the correct buffer size. */ +/* 4. Most of the conversions are implement through the native */ +/* vsprintf. Hence they are usually no faster, and */ +/* idiosyncracies of the native printf are preserved. However, */ +/* CORD arguments to CORD_sprintf and CORD_vsprintf are NOT copied; */ +/* the result shares the original structure. This may make them */ +/* very efficient in some unusual applications. */ +/* The format string is copied. */ +/* All functions return the number of characters generated or -1 on */ +/* error. This complies with the ANSI standard, but is inconsistent */ +/* with some older implementations of sprintf. */ + +/* The implementation of these is probably less portable than the rest */ +/* of this package. */ + +#ifndef CORD_NO_IO + +#include <stdarg.h> + +int CORD_sprintf(CORD * out, CORD format, ...); +int CORD_vsprintf(CORD * out, CORD format, va_list args); +int CORD_fprintf(FILE * f, CORD format, ...); +int CORD_vfprintf(FILE * f, CORD format, va_list args); +int CORD_printf(CORD format, ...); +int CORD_vprintf(CORD format, va_list args); + +#endif /* CORD_NO_IO */ + +# endif /* CORD_H */ diff --git a/boehm-gc/cord/ec.h b/boehm-gc/cord/ec.h new file mode 100644 index 00000000000..c829b83ad11 --- /dev/null +++ b/boehm-gc/cord/ec.h @@ -0,0 +1,70 @@ +# ifndef EC_H +# define EC_H + +# ifndef CORD_H +# include "cord.h" +# endif + +/* Extensible cords are strings that may be destructively appended to. */ +/* They allow fast construction of cords from characters that are */ +/* being read from a stream. */ +/* + * A client might look like: + * + * { + * CORD_ec x; + * CORD result; + * char c; + * FILE *f; + * + * ... + * CORD_ec_init(x); + * while(...) { + * c = getc(f); + * ... + * CORD_ec_append(x, c); + * } + * result = CORD_balance(CORD_ec_to_cord(x)); + * + * If a C string is desired as the final result, the call to CORD_balance + * may be replaced by a call to CORD_to_char_star. + */ + +# ifndef CORD_BUFSZ +# define CORD_BUFSZ 128 +# endif + +typedef struct CORD_ec_struct { + CORD ec_cord; + char * ec_bufptr; + char ec_buf[CORD_BUFSZ+1]; +} CORD_ec[1]; + +/* This structure represents the concatenation of ec_cord with */ +/* ec_buf[0 ... (ec_bufptr-ec_buf-1)] */ + +/* Flush the buffer part of the extended chord into ec_cord. */ +/* Note that this is almost the only real function, and it is */ +/* implemented in 6 lines in cordxtra.c */ +void CORD_ec_flush_buf(CORD_ec x); + +/* Convert an extensible cord to a cord. */ +# define CORD_ec_to_cord(x) (CORD_ec_flush_buf(x), (x)[0].ec_cord) + +/* Initialize an extensible cord. */ +# define CORD_ec_init(x) ((x)[0].ec_cord = 0, (x)[0].ec_bufptr = (x)[0].ec_buf) + +/* Append a character to an extensible cord. */ +# define CORD_ec_append(x, c) \ + { \ + if ((x)[0].ec_bufptr == (x)[0].ec_buf + CORD_BUFSZ) { \ + CORD_ec_flush_buf(x); \ + } \ + *((x)[0].ec_bufptr)++ = (c); \ + } + +/* Append a cord to an extensible cord. Structure remains shared with */ +/* original. */ +void CORD_ec_append_cord(CORD_ec x, CORD s); + +# endif /* EC_H */ diff --git a/boehm-gc/cord/gc.h b/boehm-gc/cord/gc.h new file mode 100644 index 00000000000..3ac0d4403df --- /dev/null +++ b/boehm-gc/cord/gc.h @@ -0,0 +1,767 @@ +/* + * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers + * Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved. + * Copyright 1996-1999 by Silicon Graphics. All rights reserved. + * Copyright 1999 by Hewlett-Packard Company. All rights reserved. + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + */ + +/* + * Note that this defines a large number of tuning hooks, which can + * safely be ignored in nearly all cases. For normal use it suffices + * to call only GC_MALLOC and perhaps GC_REALLOC. + * For better performance, also look at GC_MALLOC_ATOMIC, and + * GC_enable_incremental. If you need an action to be performed + * immediately before an object is collected, look at GC_register_finalizer. + * If you are using Solaris threads, look at the end of this file. + * Everything else is best ignored unless you encounter performance + * problems. + */ + +#ifndef _GC_H + +# define _GC_H +# define __GC +# include <stddef.h> + +#if defined(__CYGWIN32__) && defined(GC_USE_DLL) +#include "libgc_globals.h" +#endif + +#if defined(_MSC_VER) && defined(_DLL) +# ifdef GC_BUILD +# define GC_API __declspec(dllexport) +# else +# define GC_API __declspec(dllimport) +# endif +#endif + +#if defined(__WATCOMC__) && defined(GC_DLL) +# ifdef GC_BUILD +# define GC_API extern __declspec(dllexport) +# else +# define GC_API extern __declspec(dllimport) +# endif +#endif + +#ifndef GC_API +#define GC_API extern +#endif + +# if defined(__STDC__) || defined(__cplusplus) +# define GC_PROTO(args) args + typedef void * GC_PTR; +# define GC_CONST const +# else +# define GC_PROTO(args) () + typedef char * GC_PTR; +# define GC_CONST +# endif + +# ifdef __cplusplus + extern "C" { +# endif + + +/* Define word and signed_word to be unsigned and signed types of the */ +/* size as char * or void *. There seems to be no way to do this */ +/* even semi-portably. The following is probably no better/worse */ +/* than almost anything else. */ +/* The ANSI standard suggests that size_t and ptr_diff_t might be */ +/* better choices. But those appear to have incorrect definitions */ +/* on may systems. Notably "typedef int size_t" seems to be both */ +/* frequent and WRONG. */ +typedef unsigned long GC_word; +typedef long GC_signed_word; + +/* Public read-only variables */ + +GC_API GC_word GC_gc_no;/* Counter incremented per collection. */ + /* Includes empty GCs at startup. */ + + +/* Public R/W variables */ + +GC_API GC_PTR (*GC_oom_fn) GC_PROTO((size_t bytes_requested)); + /* When there is insufficient memory to satisfy */ + /* an allocation request, we return */ + /* (*GC_oom_fn)(). By default this just */ + /* returns 0. */ + /* If it returns, it must return 0 or a valid */ + /* pointer to a previously allocated heap */ + /* object. */ + +GC_API int GC_find_leak; + /* Do not actually garbage collect, but simply */ + /* report inaccessible memory that was not */ + /* deallocated with GC_free. Initial value */ + /* is determined by FIND_LEAK macro. */ + +GC_API int GC_quiet; /* Disable statistics output. Only matters if */ + /* collector has been compiled with statistics */ + /* enabled. This involves a performance cost, */ + /* and is thus not the default. */ + +GC_API int GC_finalize_on_demand; + /* If nonzero, finalizers will only be run in */ + /* response to an eplit GC_invoke_finalizers */ + /* call. The default is determined by whether */ + /* the FINALIZE_ON_DEMAND macro is defined */ + /* when the collector is built. */ + +GC_API int GC_java_finalization; + /* Mark objects reachable from finalizable */ + /* objects in a separate postpass. This makes */ + /* it a bit safer to use non-topologically- */ + /* ordered finalization. Default value is */ + /* determined by JAVA_FINALIZATION macro. */ + +GC_API int GC_dont_gc; /* Dont collect unless explicitly requested, e.g. */ + /* because it's not safe. */ + +GC_API int GC_dont_expand; + /* Dont expand heap unless explicitly requested */ + /* or forced to. */ + +GC_API int GC_full_freq; /* Number of partial collections between */ + /* full collections. Matters only if */ + /* GC_incremental is set. */ + /* Full collections are also triggered if */ + /* the collector detects a substantial */ + /* increase in the number of in-use heap */ + /* blocks. Values in the tens are now */ + /* perfectly reasonable, unlike for */ + /* earlier GC versions. */ + +GC_API GC_word GC_non_gc_bytes; + /* Bytes not considered candidates for collection. */ + /* Used only to control scheduling of collections. */ + +GC_API GC_word GC_free_space_divisor; + /* We try to make sure that we allocate at */ + /* least N/GC_free_space_divisor bytes between */ + /* collections, where N is the heap size plus */ + /* a rough estimate of the root set size. */ + /* Initially, GC_free_space_divisor = 4. */ + /* Increasing its value will use less space */ + /* but more collection time. Decreasing it */ + /* will appreciably decrease collection time */ + /* at the expense of space. */ + /* GC_free_space_divisor = 1 will effectively */ + /* disable collections. */ + +GC_API GC_word GC_max_retries; + /* The maximum number of GCs attempted before */ + /* reporting out of memory after heap */ + /* expansion fails. Initially 0. */ + + +GC_API char *GC_stackbottom; /* Cool end of user stack. */ + /* May be set in the client prior to */ + /* calling any GC_ routines. This */ + /* avoids some overhead, and */ + /* potentially some signals that can */ + /* confuse debuggers. Otherwise the */ + /* collector attempts to set it */ + /* automatically. */ + /* For multithreaded code, this is the */ + /* cold end of the stack for the */ + /* primordial thread. */ + +/* Public procedures */ +/* + * general purpose allocation routines, with roughly malloc calling conv. + * The atomic versions promise that no relevant pointers are contained + * in the object. The nonatomic versions guarantee that the new object + * is cleared. GC_malloc_stubborn promises that no changes to the object + * will occur after GC_end_stubborn_change has been called on the + * result of GC_malloc_stubborn. GC_malloc_uncollectable allocates an object + * that is scanned for pointers to collectable objects, but is not itself + * collectable. GC_malloc_uncollectable and GC_free called on the resulting + * object implicitly update GC_non_gc_bytes appropriately. + */ +GC_API GC_PTR GC_malloc GC_PROTO((size_t size_in_bytes)); +GC_API GC_PTR GC_malloc_atomic GC_PROTO((size_t size_in_bytes)); +GC_API GC_PTR GC_malloc_uncollectable GC_PROTO((size_t size_in_bytes)); +GC_API GC_PTR GC_malloc_stubborn GC_PROTO((size_t size_in_bytes)); + +/* The following is only defined if the library has been suitably */ +/* compiled: */ +GC_API GC_PTR GC_malloc_atomic_uncollectable GC_PROTO((size_t size_in_bytes)); + +/* Explicitly deallocate an object. Dangerous if used incorrectly. */ +/* Requires a pointer to the base of an object. */ +/* If the argument is stubborn, it should not be changeable when freed. */ +/* An object should not be enable for finalization when it is */ +/* explicitly deallocated. */ +/* GC_free(0) is a no-op, as required by ANSI C for free. */ +GC_API void GC_free GC_PROTO((GC_PTR object_addr)); + +/* + * Stubborn objects may be changed only if the collector is explicitly informed. + * The collector is implicitly informed of coming change when such + * an object is first allocated. The following routines inform the + * collector that an object will no longer be changed, or that it will + * once again be changed. Only nonNIL pointer stores into the object + * are considered to be changes. The argument to GC_end_stubborn_change + * must be exacly the value returned by GC_malloc_stubborn or passed to + * GC_change_stubborn. (In the second case it may be an interior pointer + * within 512 bytes of the beginning of the objects.) + * There is a performance penalty for allowing more than + * one stubborn object to be changed at once, but it is acceptable to + * do so. The same applies to dropping stubborn objects that are still + * changeable. + */ +GC_API void GC_change_stubborn GC_PROTO((GC_PTR)); +GC_API void GC_end_stubborn_change GC_PROTO((GC_PTR)); + +/* Return a pointer to the base (lowest address) of an object given */ +/* a pointer to a location within the object. */ +/* Return 0 if displaced_pointer doesn't point to within a valid */ +/* object. */ +GC_API GC_PTR GC_base GC_PROTO((GC_PTR displaced_pointer)); + +/* Given a pointer to the base of an object, return its size in bytes. */ +/* The returned size may be slightly larger than what was originally */ +/* requested. */ +GC_API size_t GC_size GC_PROTO((GC_PTR object_addr)); + +/* For compatibility with C library. This is occasionally faster than */ +/* a malloc followed by a bcopy. But if you rely on that, either here */ +/* or with the standard C library, your code is broken. In my */ +/* opinion, it shouldn't have been invented, but now we're stuck. -HB */ +/* The resulting object has the same kind as the original. */ +/* If the argument is stubborn, the result will have changes enabled. */ +/* It is an error to have changes enabled for the original object. */ +/* Follows ANSI comventions for NULL old_object. */ +GC_API GC_PTR GC_realloc + GC_PROTO((GC_PTR old_object, size_t new_size_in_bytes)); + +/* Explicitly increase the heap size. */ +/* Returns 0 on failure, 1 on success. */ +GC_API int GC_expand_hp GC_PROTO((size_t number_of_bytes)); + +/* Limit the heap size to n bytes. Useful when you're debugging, */ +/* especially on systems that don't handle running out of memory well. */ +/* n == 0 ==> unbounded. This is the default. */ +GC_API void GC_set_max_heap_size GC_PROTO((GC_word n)); + +/* Inform the collector that a certain section of statically allocated */ +/* memory contains no pointers to garbage collected memory. Thus it */ +/* need not be scanned. This is sometimes important if the application */ +/* maps large read/write files into the address space, which could be */ +/* mistaken for dynamic library data segments on some systems. */ +GC_API void GC_exclude_static_roots GC_PROTO((GC_PTR start, GC_PTR finish)); + +/* Clear the set of root segments. Wizards only. */ +GC_API void GC_clear_roots GC_PROTO((void)); + +/* Add a root segment. Wizards only. */ +GC_API void GC_add_roots GC_PROTO((char * low_address, + char * high_address_plus_1)); + +/* Add a displacement to the set of those considered valid by the */ +/* collector. GC_register_displacement(n) means that if p was returned */ +/* by GC_malloc, then (char *)p + n will be considered to be a valid */ +/* pointer to n. N must be small and less than the size of p. */ +/* (All pointers to the interior of objects from the stack are */ +/* considered valid in any case. This applies to heap objects and */ +/* static data.) */ +/* Preferably, this should be called before any other GC procedures. */ +/* Calling it later adds to the probability of excess memory */ +/* retention. */ +/* This is a no-op if the collector was compiled with recognition of */ +/* arbitrary interior pointers enabled, which is now the default. */ +GC_API void GC_register_displacement GC_PROTO((GC_word n)); + +/* The following version should be used if any debugging allocation is */ +/* being done. */ +GC_API void GC_debug_register_displacement GC_PROTO((GC_word n)); + +/* Explicitly trigger a full, world-stop collection. */ +GC_API void GC_gcollect GC_PROTO((void)); + +/* Trigger a full world-stopped collection. Abort the collection if */ +/* and when stop_func returns a nonzero value. Stop_func will be */ +/* called frequently, and should be reasonably fast. This works even */ +/* if virtual dirty bits, and hence incremental collection is not */ +/* available for this architecture. Collections can be aborted faster */ +/* than normal pause times for incremental collection. However, */ +/* aborted collections do no useful work; the next collection needs */ +/* to start from the beginning. */ +/* Return 0 if the collection was aborted, 1 if it succeeded. */ +typedef int (* GC_stop_func) GC_PROTO((void)); +GC_API int GC_try_to_collect GC_PROTO((GC_stop_func stop_func)); + +/* Return the number of bytes in the heap. Excludes collector private */ +/* data structures. Includes empty blocks and fragmentation loss. */ +/* Includes some pages that were allocated but never written. */ +GC_API size_t GC_get_heap_size GC_PROTO((void)); + +/* Return a lower bound on the number of free bytes in the heap. */ +GC_API size_t GC_get_free_bytes GC_PROTO((void)); + +/* Return the number of bytes allocated since the last collection. */ +GC_API size_t GC_get_bytes_since_gc GC_PROTO((void)); + +/* Enable incremental/generational collection. */ +/* Not advisable unless dirty bits are */ +/* available or most heap objects are */ +/* pointerfree(atomic) or immutable. */ +/* Don't use in leak finding mode. */ +/* Ignored if GC_dont_gc is true. */ +GC_API void GC_enable_incremental GC_PROTO((void)); + +/* Perform some garbage collection work, if appropriate. */ +/* Return 0 if there is no more work to be done. */ +/* Typically performs an amount of work corresponding roughly */ +/* to marking from one page. May do more work if further */ +/* progress requires it, e.g. if incremental collection is */ +/* disabled. It is reasonable to call this in a wait loop */ +/* until it returns 0. */ +GC_API int GC_collect_a_little GC_PROTO((void)); + +/* Allocate an object of size lb bytes. The client guarantees that */ +/* as long as the object is live, it will be referenced by a pointer */ +/* that points to somewhere within the first 256 bytes of the object. */ +/* (This should normally be declared volatile to prevent the compiler */ +/* from invalidating this assertion.) This routine is only useful */ +/* if a large array is being allocated. It reduces the chance of */ +/* accidentally retaining such an array as a result of scanning an */ +/* integer that happens to be an address inside the array. (Actually, */ +/* it reduces the chance of the allocator not finding space for such */ +/* an array, since it will try hard to avoid introducing such a false */ +/* reference.) On a SunOS 4.X or MS Windows system this is recommended */ +/* for arrays likely to be larger than 100K or so. For other systems, */ +/* or if the collector is not configured to recognize all interior */ +/* pointers, the threshold is normally much higher. */ +GC_API GC_PTR GC_malloc_ignore_off_page GC_PROTO((size_t lb)); +GC_API GC_PTR GC_malloc_atomic_ignore_off_page GC_PROTO((size_t lb)); + +#if defined(__sgi) && !defined(__GNUC__) && _COMPILER_VERSION >= 720 +# define GC_ADD_CALLER +# define GC_RETURN_ADDR (GC_word)__return_address +#endif + +#ifdef GC_ADD_CALLER +# define GC_EXTRAS GC_RETURN_ADDR, __FILE__, __LINE__ +# define GC_EXTRA_PARAMS GC_word ra, GC_CONST char * s, + int i +#else +# define GC_EXTRAS __FILE__, __LINE__ +# define GC_EXTRA_PARAMS GC_CONST char * s, int i +#endif + +/* Debugging (annotated) allocation. GC_gcollect will check */ +/* objects allocated in this way for overwrites, etc. */ +GC_API GC_PTR GC_debug_malloc + GC_PROTO((size_t size_in_bytes, GC_EXTRA_PARAMS)); +GC_API GC_PTR GC_debug_malloc_atomic + GC_PROTO((size_t size_in_bytes, GC_EXTRA_PARAMS)); +GC_API GC_PTR GC_debug_malloc_uncollectable + GC_PROTO((size_t size_in_bytes, GC_EXTRA_PARAMS)); +GC_API GC_PTR GC_debug_malloc_stubborn + GC_PROTO((size_t size_in_bytes, GC_EXTRA_PARAMS)); +GC_API void GC_debug_free GC_PROTO((GC_PTR object_addr)); +GC_API GC_PTR GC_debug_realloc + GC_PROTO((GC_PTR old_object, size_t new_size_in_bytes, + GC_EXTRA_PARAMS)); + +GC_API void GC_debug_change_stubborn GC_PROTO((GC_PTR)); +GC_API void GC_debug_end_stubborn_change GC_PROTO((GC_PTR)); +# ifdef GC_DEBUG +# define GC_MALLOC(sz) GC_debug_malloc(sz, GC_EXTRAS) +# define GC_MALLOC_ATOMIC(sz) GC_debug_malloc_atomic(sz, GC_EXTRAS) +# define GC_MALLOC_UNCOLLECTABLE(sz) GC_debug_malloc_uncollectable(sz, \ + GC_EXTRAS) +# define GC_REALLOC(old, sz) GC_debug_realloc(old, sz, GC_EXTRAS) +# define GC_FREE(p) GC_debug_free(p) +# define GC_REGISTER_FINALIZER(p, f, d, of, od) \ + GC_debug_register_finalizer(p, f, d, of, od) +# define GC_REGISTER_FINALIZER_IGNORE_SELF(p, f, d, of, od) \ + GC_debug_register_finalizer_ignore_self(p, f, d, of, od) +# define GC_MALLOC_STUBBORN(sz) GC_debug_malloc_stubborn(sz, GC_EXTRAS); +# define GC_CHANGE_STUBBORN(p) GC_debug_change_stubborn(p) +# define GC_END_STUBBORN_CHANGE(p) GC_debug_end_stubborn_change(p) +# define GC_GENERAL_REGISTER_DISAPPEARING_LINK(link, obj) \ + GC_general_register_disappearing_link(link, GC_base(obj)) +# define GC_REGISTER_DISPLACEMENT(n) GC_debug_register_displacement(n) +# else +# define GC_MALLOC(sz) GC_malloc(sz) +# define GC_MALLOC_ATOMIC(sz) GC_malloc_atomic(sz) +# define GC_MALLOC_UNCOLLECTABLE(sz) GC_malloc_uncollectable(sz) +# define GC_REALLOC(old, sz) GC_realloc(old, sz) +# define GC_FREE(p) GC_free(p) +# define GC_REGISTER_FINALIZER(p, f, d, of, od) \ + GC_register_finalizer(p, f, d, of, od) +# define GC_REGISTER_FINALIZER_IGNORE_SELF(p, f, d, of, od) \ + GC_register_finalizer_ignore_self(p, f, d, of, od) +# define GC_MALLOC_STUBBORN(sz) GC_malloc_stubborn(sz) +# define GC_CHANGE_STUBBORN(p) GC_change_stubborn(p) +# define GC_END_STUBBORN_CHANGE(p) GC_end_stubborn_change(p) +# define GC_GENERAL_REGISTER_DISAPPEARING_LINK(link, obj) \ + GC_general_register_disappearing_link(link, obj) +# define GC_REGISTER_DISPLACEMENT(n) GC_register_displacement(n) +# endif +/* The following are included because they are often convenient, and */ +/* reduce the chance for a misspecifed size argument. But calls may */ +/* expand to something syntactically incorrect if t is a complicated */ +/* type expression. */ +# define GC_NEW(t) (t *)GC_MALLOC(sizeof (t)) +# define GC_NEW_ATOMIC(t) (t *)GC_MALLOC_ATOMIC(sizeof (t)) +# define GC_NEW_STUBBORN(t) (t *)GC_MALLOC_STUBBORN(sizeof (t)) +# define GC_NEW_UNCOLLECTABLE(t) (t *)GC_MALLOC_UNCOLLECTABLE(sizeof (t)) + +/* Finalization. Some of these primitives are grossly unsafe. */ +/* The idea is to make them both cheap, and sufficient to build */ +/* a safer layer, closer to PCedar finalization. */ +/* The interface represents my conclusions from a long discussion */ +/* with Alan Demers, Dan Greene, Carl Hauser, Barry Hayes, */ +/* Christian Jacobi, and Russ Atkinson. It's not perfect, and */ +/* probably nobody else agrees with it. Hans-J. Boehm 3/13/92 */ +typedef void (*GC_finalization_proc) + GC_PROTO((GC_PTR obj, GC_PTR client_data)); + +GC_API void GC_register_finalizer + GC_PROTO((GC_PTR obj, GC_finalization_proc fn, GC_PTR cd, + GC_finalization_proc *ofn, GC_PTR *ocd)); +GC_API void GC_debug_register_finalizer + GC_PROTO((GC_PTR obj, GC_finalization_proc fn, GC_PTR cd, + GC_finalization_proc *ofn, GC_PTR *ocd)); + /* When obj is no longer accessible, invoke */ + /* (*fn)(obj, cd). If a and b are inaccessible, and */ + /* a points to b (after disappearing links have been */ + /* made to disappear), then only a will be */ + /* finalized. (If this does not create any new */ + /* pointers to b, then b will be finalized after the */ + /* next collection.) Any finalizable object that */ + /* is reachable from itself by following one or more */ + /* pointers will not be finalized (or collected). */ + /* Thus cycles involving finalizable objects should */ + /* be avoided, or broken by disappearing links. */ + /* All but the last finalizer registered for an object */ + /* is ignored. */ + /* Finalization may be removed by passing 0 as fn. */ + /* Finalizers are implicitly unregistered just before */ + /* they are invoked. */ + /* The old finalizer and client data are stored in */ + /* *ofn and *ocd. */ + /* Fn is never invoked on an accessible object, */ + /* provided hidden pointers are converted to real */ + /* pointers only if the allocation lock is held, and */ + /* such conversions are not performed by finalization */ + /* routines. */ + /* If GC_register_finalizer is aborted as a result of */ + /* a signal, the object may be left with no */ + /* finalization, even if neither the old nor new */ + /* finalizer were NULL. */ + /* Obj should be the nonNULL starting address of an */ + /* object allocated by GC_malloc or friends. */ + /* Note that any garbage collectable object referenced */ + /* by cd will be considered accessible until the */ + /* finalizer is invoked. */ + +/* Another versions of the above follow. It ignores */ +/* self-cycles, i.e. pointers from a finalizable object to */ +/* itself. There is a stylistic argument that this is wrong, */ +/* but it's unavoidable for C++, since the compiler may */ +/* silently introduce these. It's also benign in that specific */ +/* case. */ +GC_API void GC_register_finalizer_ignore_self + GC_PROTO((GC_PTR obj, GC_finalization_proc fn, GC_PTR cd, + GC_finalization_proc *ofn, GC_PTR *ocd)); +GC_API void GC_debug_register_finalizer_ignore_self + GC_PROTO((GC_PTR obj, GC_finalization_proc fn, GC_PTR cd, + GC_finalization_proc *ofn, GC_PTR *ocd)); + +/* The following routine may be used to break cycles between */ +/* finalizable objects, thus causing cyclic finalizable */ +/* objects to be finalized in the correct order. Standard */ +/* use involves calling GC_register_disappearing_link(&p), */ +/* where p is a pointer that is not followed by finalization */ +/* code, and should not be considered in determining */ +/* finalization order. */ +GC_API int GC_register_disappearing_link GC_PROTO((GC_PTR * /* link */)); + /* Link should point to a field of a heap allocated */ + /* object obj. *link will be cleared when obj is */ + /* found to be inaccessible. This happens BEFORE any */ + /* finalization code is invoked, and BEFORE any */ + /* decisions about finalization order are made. */ + /* This is useful in telling the finalizer that */ + /* some pointers are not essential for proper */ + /* finalization. This may avoid finalization cycles. */ + /* Note that obj may be resurrected by another */ + /* finalizer, and thus the clearing of *link may */ + /* be visible to non-finalization code. */ + /* There's an argument that an arbitrary action should */ + /* be allowed here, instead of just clearing a pointer. */ + /* But this causes problems if that action alters, or */ + /* examines connectivity. */ + /* Returns 1 if link was already registered, 0 */ + /* otherwise. */ + /* Only exists for backward compatibility. See below: */ + +GC_API int GC_general_register_disappearing_link + GC_PROTO((GC_PTR * /* link */, GC_PTR obj)); + /* A slight generalization of the above. *link is */ + /* cleared when obj first becomes inaccessible. This */ + /* can be used to implement weak pointers easily and */ + /* safely. Typically link will point to a location */ + /* holding a disguised pointer to obj. (A pointer */ + /* inside an "atomic" object is effectively */ + /* disguised.) In this way soft */ + /* pointers are broken before any object */ + /* reachable from them are finalized. Each link */ + /* May be registered only once, i.e. with one obj */ + /* value. This was added after a long email discussion */ + /* with John Ellis. */ + /* Obj must be a pointer to the first word of an object */ + /* we allocated. It is unsafe to explicitly deallocate */ + /* the object containing link. Explicitly deallocating */ + /* obj may or may not cause link to eventually be */ + /* cleared. */ +GC_API int GC_unregister_disappearing_link GC_PROTO((GC_PTR * /* link */)); + /* Returns 0 if link was not actually registered. */ + /* Undoes a registration by either of the above two */ + /* routines. */ + +/* Auxiliary fns to make finalization work correctly with displaced */ +/* pointers introduced by the debugging allocators. */ +GC_API GC_PTR GC_make_closure GC_PROTO((GC_finalization_proc fn, GC_PTR data)); +GC_API void GC_debug_invoke_finalizer GC_PROTO((GC_PTR obj, GC_PTR data)); + +GC_API int GC_invoke_finalizers GC_PROTO((void)); + /* Run finalizers for all objects that are ready to */ + /* be finalized. Return the number of finalizers */ + /* that were run. Normally this is also called */ + /* implicitly during some allocations. If */ + /* GC-finalize_on_demand is nonzero, it must be called */ + /* explicitly. */ + +/* GC_set_warn_proc can be used to redirect or filter warning messages. */ +/* p may not be a NULL pointer. */ +typedef void (*GC_warn_proc) GC_PROTO((char *msg, GC_word arg)); +GC_API GC_warn_proc GC_set_warn_proc GC_PROTO((GC_warn_proc p)); + /* Returns old warning procedure. */ + +/* The following is intended to be used by a higher level */ +/* (e.g. cedar-like) finalization facility. It is expected */ +/* that finalization code will arrange for hidden pointers to */ +/* disappear. Otherwise objects can be accessed after they */ +/* have been collected. */ +/* Note that putting pointers in atomic objects or in */ +/* nonpointer slots of "typed" objects is equivalent to */ +/* disguising them in this way, and may have other advantages. */ +# if defined(I_HIDE_POINTERS) || defined(GC_I_HIDE_POINTERS) + typedef GC_word GC_hidden_pointer; +# define HIDE_POINTER(p) (~(GC_hidden_pointer)(p)) +# define REVEAL_POINTER(p) ((GC_PTR)(HIDE_POINTER(p))) + /* Converting a hidden pointer to a real pointer requires verifying */ + /* that the object still exists. This involves acquiring the */ + /* allocator lock to avoid a race with the collector. */ +# endif /* I_HIDE_POINTERS */ + +typedef GC_PTR (*GC_fn_type) GC_PROTO((GC_PTR client_data)); +GC_API GC_PTR GC_call_with_alloc_lock + GC_PROTO((GC_fn_type fn, GC_PTR client_data)); + +/* Check that p and q point to the same object. */ +/* Fail conspicuously if they don't. */ +/* Returns the first argument. */ +/* Succeeds if neither p nor q points to the heap. */ +/* May succeed if both p and q point to between heap objects. */ +GC_API GC_PTR GC_same_obj GC_PROTO((GC_PTR p, GC_PTR q)); + +/* Checked pointer pre- and post- increment operations. Note that */ +/* the second argument is in units of bytes, not multiples of the */ +/* object size. This should either be invoked from a macro, or the */ +/* call should be automatically generated. */ +GC_API GC_PTR GC_pre_incr GC_PROTO((GC_PTR *p, size_t how_much)); +GC_API GC_PTR GC_post_incr GC_PROTO((GC_PTR *p, size_t how_much)); + +/* Check that p is visible */ +/* to the collector as a possibly pointer containing location. */ +/* If it isn't fail conspicuously. */ +/* Returns the argument in all cases. May erroneously succeed */ +/* in hard cases. (This is intended for debugging use with */ +/* untyped allocations. The idea is that it should be possible, though */ +/* slow, to add such a call to all indirect pointer stores.) */ +/* Currently useless for multithreaded worlds. */ +GC_API GC_PTR GC_is_visible GC_PROTO((GC_PTR p)); + +/* Check that if p is a pointer to a heap page, then it points to */ +/* a valid displacement within a heap object. */ +/* Fail conspicuously if this property does not hold. */ +/* Uninteresting with ALL_INTERIOR_POINTERS. */ +/* Always returns its argument. */ +GC_API GC_PTR GC_is_valid_displacement GC_PROTO((GC_PTR p)); + +/* Safer, but slow, pointer addition. Probably useful mainly with */ +/* a preprocessor. Useful only for heap pointers. */ +#ifdef GC_DEBUG +# define GC_PTR_ADD3(x, n, type_of_result) \ + ((type_of_result)GC_same_obj((x)+(n), (x))) +# define GC_PRE_INCR3(x, n, type_of_result) \ + ((type_of_result)GC_pre_incr(&(x), (n)*sizeof(*x)) +# define GC_POST_INCR2(x, type_of_result) \ + ((type_of_result)GC_post_incr(&(x), sizeof(*x)) +# ifdef __GNUC__ +# define GC_PTR_ADD(x, n) \ + GC_PTR_ADD3(x, n, typeof(x)) +# define GC_PRE_INCR(x, n) \ + GC_PRE_INCR3(x, n, typeof(x)) +# define GC_POST_INCR(x, n) \ + GC_POST_INCR3(x, typeof(x)) +# else + /* We can't do this right without typeof, which ANSI */ + /* decided was not sufficiently useful. Repeatedly */ + /* mentioning the arguments seems too dangerous to be */ + /* useful. So does not casting the result. */ +# define GC_PTR_ADD(x, n) ((x)+(n)) +# endif +#else /* !GC_DEBUG */ +# define GC_PTR_ADD3(x, n, type_of_result) ((x)+(n)) +# define GC_PTR_ADD(x, n) ((x)+(n)) +# define GC_PRE_INCR3(x, n, type_of_result) ((x) += (n)) +# define GC_PRE_INCR(x, n) ((x) += (n)) +# define GC_POST_INCR2(x, n, type_of_result) ((x)++) +# define GC_POST_INCR(x, n) ((x)++) +#endif + +/* Safer assignment of a pointer to a nonstack location. */ +#ifdef GC_DEBUG +# ifdef __STDC__ +# define GC_PTR_STORE(p, q) \ + (*(void **)GC_is_visible(p) = GC_is_valid_displacement(q)) +# else +# define GC_PTR_STORE(p, q) \ + (*(char **)GC_is_visible(p) = GC_is_valid_displacement(q)) +# endif +#else /* !GC_DEBUG */ +# define GC_PTR_STORE(p, q) *((p) = (q)) +#endif + +/* Fynctions called to report pointer checking errors */ +GC_API void (*GC_same_obj_print_proc) GC_PROTO((GC_PTR p, GC_PTR q)); + +GC_API void (*GC_is_valid_displacement_print_proc) + GC_PROTO((GC_PTR p)); + +GC_API void (*GC_is_visible_print_proc) + GC_PROTO((GC_PTR p)); + +#if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS) +# define SOLARIS_THREADS +#endif + +#ifdef SOLARIS_THREADS +/* We need to intercept calls to many of the threads primitives, so */ +/* that we can locate thread stacks and stop the world. */ +/* Note also that the collector cannot see thread specific data. */ +/* Thread specific data should generally consist of pointers to */ +/* uncollectable objects, which are deallocated using the destructor */ +/* facility in thr_keycreate. */ +# include <thread.h> +# include <signal.h> + int GC_thr_create(void *stack_base, size_t stack_size, + void *(*start_routine)(void *), void *arg, long flags, + thread_t *new_thread); + int GC_thr_join(thread_t wait_for, thread_t *departed, void **status); + int GC_thr_suspend(thread_t target_thread); + int GC_thr_continue(thread_t target_thread); + void * GC_dlopen(const char *path, int mode); + +# ifdef _SOLARIS_PTHREADS +# include <pthread.h> + extern int GC_pthread_create(pthread_t *new_thread, + const pthread_attr_t *attr, + void * (*thread_execp)(void *), void *arg); + extern int GC_pthread_join(pthread_t wait_for, void **status); + +# undef thread_t + +# define pthread_join GC_pthread_join +# define pthread_create GC_pthread_create +#endif + +# define thr_create GC_thr_create +# define thr_join GC_thr_join +# define thr_suspend GC_thr_suspend +# define thr_continue GC_thr_continue +# define dlopen GC_dlopen + +# endif /* SOLARIS_THREADS */ + + +#if defined(IRIX_THREADS) || defined(LINUX_THREADS) || defined(HPUX_THREADS) +/* We treat these similarly. */ +# include <pthread.h> +# include <signal.h> + + int GC_pthread_create(pthread_t *new_thread, + const pthread_attr_t *attr, + void *(*start_routine)(void *), void *arg); + int GC_pthread_sigmask(int how, const sigset_t *set, sigset_t *oset); + int GC_pthread_join(pthread_t thread, void **retval); + +# define pthread_create GC_pthread_create +# define pthread_sigmask GC_pthread_sigmask +# define pthread_join GC_pthread_join + +#endif /* IRIX_THREADS || LINUX_THREADS */ + +# if defined(PCR) || defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \ + defined(IRIX_THREADS) || defined(LINUX_THREADS) || \ + defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS) + /* Any flavor of threads except SRC_M3. */ +/* This returns a list of objects, linked through their first */ +/* word. Its use can greatly reduce lock contention problems, since */ +/* the allocation lock can be acquired and released many fewer times. */ +/* lb must be large enough to hold the pointer field. */ +GC_PTR GC_malloc_many(size_t lb); +#define GC_NEXT(p) (*(GC_PTR *)(p)) /* Retrieve the next element */ + /* in returned list. */ +extern void GC_thr_init(); /* Needed for Solaris/X86 */ + +#endif /* THREADS && !SRC_M3 */ + +/* + * If you are planning on putting + * the collector in a SunOS 5 dynamic library, you need to call GC_INIT() + * from the statically loaded program section. + * This circumvents a Solaris 2.X (X<=4) linker bug. + */ +#if defined(sparc) || defined(__sparc) +# define GC_INIT() { extern end, etext; \ + GC_noop(&end, &etext); } +#else +# if defined(__CYGWIN32__) && defined(GC_USE_DLL) + /* + * Similarly gnu-win32 DLLs need explicit initialization + */ +# define GC_INIT() { GC_add_roots(DATASTART, DATAEND); } +# else +# define GC_INIT() +# endif +#endif + +#if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \ + || defined(_WIN32) + /* win32S may not free all resources on process exit. */ + /* This explicitly deallocates the heap. */ + GC_API void GC_win32_free_heap (); +#endif + +#ifdef __cplusplus + } /* end of extern "C" */ +#endif + +#endif /* _GC_H */ diff --git a/boehm-gc/cord/private/cord_pos.h b/boehm-gc/cord/private/cord_pos.h new file mode 100644 index 00000000000..d2b24bb8ab6 --- /dev/null +++ b/boehm-gc/cord/private/cord_pos.h @@ -0,0 +1,118 @@ +/* + * Copyright (c) 1993-1994 by Xerox Corporation. All rights reserved. + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + */ +/* Boehm, May 19, 1994 2:23 pm PDT */ +# ifndef CORD_POSITION_H + +/* The representation of CORD_position. This is private to the */ +/* implementation, but the size is known to clients. Also */ +/* the implementation of some exported macros relies on it. */ +/* Don't use anything defined here and not in cord.h. */ + +# define MAX_DEPTH 48 + /* The maximum depth of a balanced cord + 1. */ + /* We don't let cords get deeper than MAX_DEPTH. */ + +struct CORD_pe { + CORD pe_cord; + size_t pe_start_pos; +}; + +/* A structure describing an entry on the path from the root */ +/* to current position. */ +typedef struct CORD_Pos { + size_t cur_pos; + int path_len; +# define CORD_POS_INVALID (0x55555555) + /* path_len == INVALID <==> position invalid */ + const char *cur_leaf; /* Current leaf, if it is a string. */ + /* If the current leaf is a function, */ + /* then this may point to function_buf */ + /* containing the next few characters. */ + /* Always points to a valid string */ + /* containing the current character */ + /* unless cur_end is 0. */ + size_t cur_start; /* Start position of cur_leaf */ + size_t cur_end; /* Ending position of cur_leaf */ + /* 0 if cur_leaf is invalid. */ + struct CORD_pe path[MAX_DEPTH + 1]; + /* path[path_len] is the leaf corresponding to cur_pos */ + /* path[0].pe_cord is the cord we point to. */ +# define FUNCTION_BUF_SZ 8 + char function_buf[FUNCTION_BUF_SZ]; /* Space for next few chars */ + /* from function node. */ +} CORD_pos[1]; + +/* Extract the cord from a position: */ +CORD CORD_pos_to_cord(CORD_pos p); + +/* Extract the current index from a position: */ +size_t CORD_pos_to_index(CORD_pos p); + +/* Fetch the character located at the given position: */ +char CORD_pos_fetch(CORD_pos p); + +/* Initialize the position to refer to the give cord and index. */ +/* Note that this is the most expensive function on positions: */ +void CORD_set_pos(CORD_pos p, CORD x, size_t i); + +/* Advance the position to the next character. */ +/* P must be initialized and valid. */ +/* Invalidates p if past end: */ +void CORD_next(CORD_pos p); + +/* Move the position to the preceding character. */ +/* P must be initialized and valid. */ +/* Invalidates p if past beginning: */ +void CORD_prev(CORD_pos p); + +/* Is the position valid, i.e. inside the cord? */ +int CORD_pos_valid(CORD_pos p); + +char CORD__pos_fetch(CORD_pos); +void CORD__next(CORD_pos); +void CORD__prev(CORD_pos); + +#define CORD_pos_fetch(p) \ + (((p)[0].cur_end != 0)? \ + (p)[0].cur_leaf[(p)[0].cur_pos - (p)[0].cur_start] \ + : CORD__pos_fetch(p)) + +#define CORD_next(p) \ + (((p)[0].cur_pos + 1 < (p)[0].cur_end)? \ + (p)[0].cur_pos++ \ + : (CORD__next(p), 0)) + +#define CORD_prev(p) \ + (((p)[0].cur_end != 0 && (p)[0].cur_pos > (p)[0].cur_start)? \ + (p)[0].cur_pos-- \ + : (CORD__prev(p), 0)) + +#define CORD_pos_to_index(p) ((p)[0].cur_pos) + +#define CORD_pos_to_cord(p) ((p)[0].path[0].pe_cord) + +#define CORD_pos_valid(p) ((p)[0].path_len != CORD_POS_INVALID) + +/* Some grubby stuff for performance-critical friends: */ +#define CORD_pos_chars_left(p) ((long)((p)[0].cur_end) - (long)((p)[0].cur_pos)) + /* Number of characters in cache. <= 0 ==> none */ + +#define CORD_pos_advance(p,n) ((p)[0].cur_pos += (n) - 1, CORD_next(p)) + /* Advance position by n characters */ + /* 0 < n < CORD_pos_chars_left(p) */ + +#define CORD_pos_cur_char_addr(p) \ + (p)[0].cur_leaf + ((p)[0].cur_pos - (p)[0].cur_start) + /* address of current character in cache. */ + +#endif diff --git a/boehm-gc/dbg_mlc.h b/boehm-gc/dbg_mlc.h new file mode 100644 index 00000000000..6abeda8a611 --- /dev/null +++ b/boehm-gc/dbg_mlc.h @@ -0,0 +1,102 @@ +/* + * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers + * Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved. + * Copyright (c) 1997 by Silicon Graphics. All rights reserved. + * Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved. + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + */ + +/* + * This is mostly an internal header file. Typical clients should + * not use it. Clients that define their own object kinds with + * debugging allocators will probably want to include this, however. + * No attempt is made to keep the namespace clean. This should not be + * included from header filrd that are frequently included by clients. + */ + +#ifndef _DBG_MLC_H + +#define _DBG_MLC_H + +# define I_HIDE_POINTERS +# include "gc_priv.h" +# ifdef KEEP_BACK_PTRS +# include "backptr.h" +# endif + +# define START_FLAG ((word)0xfedcedcb) +# define END_FLAG ((word)0xbcdecdef) + /* Stored both one past the end of user object, and one before */ + /* the end of the object as seen by the allocator. */ + + +/* Object header */ +typedef struct { +# ifdef KEEP_BACK_PTRS + ptr_t oh_back_ptr; +# define MARKED_FOR_FINALIZATION (ptr_t)(-1) + /* Object was marked because it is finalizable. */ +# define MARKED_FROM_REGISTER (ptr_t)(-2) + /* Object was marked from a rgister. Hence the */ + /* source of the reference doesn't have an address. */ +# ifdef ALIGN_DOUBLE + word oh_dummy; +# endif +# endif + char * oh_string; /* object descriptor string */ + word oh_int; /* object descriptor integers */ +# ifdef NEED_CALLINFO + struct callinfo oh_ci[NFRAMES]; +# endif + word oh_sz; /* Original malloc arg. */ + word oh_sf; /* start flag */ +} oh; +/* The size of the above structure is assumed not to dealign things, */ +/* and to be a multiple of the word length. */ + +#define DEBUG_BYTES (sizeof (oh) + sizeof (word)) +#define USR_PTR_FROM_BASE(p) ((ptr_t)(p) + sizeof(oh)) + +/* There is no reason to ever add a byte at the end explicitly, since we */ +/* already add a guard word. */ +#undef ROUNDED_UP_WORDS +#define ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + WORDS_TO_BYTES(1) - 1) + +#ifdef SAVE_CALL_CHAIN +# define ADD_CALL_CHAIN(base, ra) GC_save_callers(((oh *)(base)) -> oh_ci) +# define PRINT_CALL_CHAIN(base) GC_print_callers(((oh *)(base)) -> oh_ci) +#else +# ifdef GC_ADD_CALLER +# define ADD_CALL_CHAIN(base, ra) ((oh *)(base)) -> oh_ci[0].ci_pc = (ra) +# define PRINT_CALL_CHAIN(base) GC_print_callers(((oh *)(base)) -> oh_ci) +# else +# define ADD_CALL_CHAIN(base, ra) +# define PRINT_CALL_CHAIN(base) +# endif +#endif + +# ifdef GC_ADD_CALLER +# define OPT_RA ra, +# else +# define OPT_RA +# endif + + +/* Check whether object with base pointer p has debugging info */ +/* p is assumed to point to a legitimate object in our part */ +/* of the heap. */ +GC_bool GC_has_debug_info(/* p */); + +/* Store debugging info into p. Return displaced pointer. */ +/* Assumes we don't hold allocation lock. */ +ptr_t GC_store_debug_info(/* p, sz, string, integer */); + +#endif /* _DBG_MLC_H */ diff --git a/boehm-gc/gc.h b/boehm-gc/gc.h new file mode 100644 index 00000000000..e35f54f7d3f --- /dev/null +++ b/boehm-gc/gc.h @@ -0,0 +1,805 @@ +/* + * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers + * Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved. + * Copyright 1996-1999 by Silicon Graphics. All rights reserved. + * Copyright 1999 by Hewlett-Packard Company. All rights reserved. + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + */ + +/* + * Note that this defines a large number of tuning hooks, which can + * safely be ignored in nearly all cases. For normal use it suffices + * to call only GC_MALLOC and perhaps GC_REALLOC. + * For better performance, also look at GC_MALLOC_ATOMIC, and + * GC_enable_incremental. If you need an action to be performed + * immediately before an object is collected, look at GC_register_finalizer. + * If you are using Solaris threads, look at the end of this file. + * Everything else is best ignored unless you encounter performance + * problems. + */ + +#ifndef _GC_H + +# define _GC_H +# define __GC +# include <stddef.h> + +#if defined(__CYGWIN32__) && defined(GC_USE_DLL) +#include "libgc_globals.h" +#endif + +#if defined(__MINGW32__) && defined(WIN32_THREADS) +# ifdef GC_BUILD +# define GC_API __declspec(dllexport) +# else +# define GC_API __declspec(dllimport) +# endif +#endif + +#if defined(_MSC_VER) && defined(_DLL) +# ifdef GC_BUILD +# define GC_API __declspec(dllexport) +# else +# define GC_API __declspec(dllimport) +# endif +#endif + +#if defined(__WATCOMC__) && defined(GC_DLL) +# ifdef GC_BUILD +# define GC_API extern __declspec(dllexport) +# else +# define GC_API extern __declspec(dllimport) +# endif +#endif + +#ifndef GC_API +#define GC_API extern +#endif + +# if defined(__STDC__) || defined(__cplusplus) +# define GC_PROTO(args) args + typedef void * GC_PTR; +# define GC_CONST const +# else +# define GC_PROTO(args) () + typedef char * GC_PTR; +# define GC_CONST +# endif + +# ifdef __cplusplus + extern "C" { +# endif + + +/* Define word and signed_word to be unsigned and signed types of the */ +/* size as char * or void *. There seems to be no way to do this */ +/* even semi-portably. The following is probably no better/worse */ +/* than almost anything else. */ +/* The ANSI standard suggests that size_t and ptr_diff_t might be */ +/* better choices. But those appear to have incorrect definitions */ +/* on may systems. Notably "typedef int size_t" seems to be both */ +/* frequent and WRONG. */ +typedef unsigned long GC_word; +typedef long GC_signed_word; + +/* Public read-only variables */ + +GC_API GC_word GC_gc_no;/* Counter incremented per collection. */ + /* Includes empty GCs at startup. */ + + +/* Public R/W variables */ + +GC_API GC_PTR (*GC_oom_fn) GC_PROTO((size_t bytes_requested)); + /* When there is insufficient memory to satisfy */ + /* an allocation request, we return */ + /* (*GC_oom_fn)(). By default this just */ + /* returns 0. */ + /* If it returns, it must return 0 or a valid */ + /* pointer to a previously allocated heap */ + /* object. */ + +GC_API int GC_find_leak; + /* Do not actually garbage collect, but simply */ + /* report inaccessible memory that was not */ + /* deallocated with GC_free. Initial value */ + /* is determined by FIND_LEAK macro. */ + +GC_API int GC_quiet; /* Disable statistics output. Only matters if */ + /* collector has been compiled with statistics */ + /* enabled. This involves a performance cost, */ + /* and is thus not the default. */ + +GC_API int GC_finalize_on_demand; + /* If nonzero, finalizers will only be run in */ + /* response to an eplit GC_invoke_finalizers */ + /* call. The default is determined by whether */ + /* the FINALIZE_ON_DEMAND macro is defined */ + /* when the collector is built. */ + +GC_API int GC_java_finalization; + /* Mark objects reachable from finalizable */ + /* objects in a separate postpass. This makes */ + /* it a bit safer to use non-topologically- */ + /* ordered finalization. Default value is */ + /* determined by JAVA_FINALIZATION macro. */ + +GC_API int GC_dont_gc; /* Dont collect unless explicitly requested, e.g. */ + /* because it's not safe. */ + +GC_API int GC_dont_expand; + /* Dont expand heap unless explicitly requested */ + /* or forced to. */ + +GC_API int GC_use_entire_heap; + /* Causes the nonincremental collector to use the */ + /* entire heap before collecting. This was the only */ + /* option for GC versions < 5.0. This sometimes */ + /* results in more large block fragmentation, since */ + /* very larg blocks will tend to get broken up */ + /* during each GC cycle. It is likely to result in a */ + /* larger working set, but lower collection */ + /* frequencies, and hence fewer instructions executed */ + /* in the collector. */ + +GC_API int GC_full_freq; /* Number of partial collections between */ + /* full collections. Matters only if */ + /* GC_incremental is set. */ + /* Full collections are also triggered if */ + /* the collector detects a substantial */ + /* increase in the number of in-use heap */ + /* blocks. Values in the tens are now */ + /* perfectly reasonable, unlike for */ + /* earlier GC versions. */ + +GC_API GC_word GC_non_gc_bytes; + /* Bytes not considered candidates for collection. */ + /* Used only to control scheduling of collections. */ + +GC_API GC_word GC_free_space_divisor; + /* We try to make sure that we allocate at */ + /* least N/GC_free_space_divisor bytes between */ + /* collections, where N is the heap size plus */ + /* a rough estimate of the root set size. */ + /* Initially, GC_free_space_divisor = 4. */ + /* Increasing its value will use less space */ + /* but more collection time. Decreasing it */ + /* will appreciably decrease collection time */ + /* at the expense of space. */ + /* GC_free_space_divisor = 1 will effectively */ + /* disable collections. */ + +GC_API GC_word GC_max_retries; + /* The maximum number of GCs attempted before */ + /* reporting out of memory after heap */ + /* expansion fails. Initially 0. */ + + +GC_API char *GC_stackbottom; /* Cool end of user stack. */ + /* May be set in the client prior to */ + /* calling any GC_ routines. This */ + /* avoids some overhead, and */ + /* potentially some signals that can */ + /* confuse debuggers. Otherwise the */ + /* collector attempts to set it */ + /* automatically. */ + /* For multithreaded code, this is the */ + /* cold end of the stack for the */ + /* primordial thread. */ + +/* Public procedures */ +/* + * general purpose allocation routines, with roughly malloc calling conv. + * The atomic versions promise that no relevant pointers are contained + * in the object. The nonatomic versions guarantee that the new object + * is cleared. GC_malloc_stubborn promises that no changes to the object + * will occur after GC_end_stubborn_change has been called on the + * result of GC_malloc_stubborn. GC_malloc_uncollectable allocates an object + * that is scanned for pointers to collectable objects, but is not itself + * collectable. GC_malloc_uncollectable and GC_free called on the resulting + * object implicitly update GC_non_gc_bytes appropriately. + */ +GC_API GC_PTR GC_malloc GC_PROTO((size_t size_in_bytes)); +GC_API GC_PTR GC_malloc_atomic GC_PROTO((size_t size_in_bytes)); +GC_API GC_PTR GC_malloc_uncollectable GC_PROTO((size_t size_in_bytes)); +GC_API GC_PTR GC_malloc_stubborn GC_PROTO((size_t size_in_bytes)); + +/* The following is only defined if the library has been suitably */ +/* compiled: */ +GC_API GC_PTR GC_malloc_atomic_uncollectable GC_PROTO((size_t size_in_bytes)); + +/* Explicitly deallocate an object. Dangerous if used incorrectly. */ +/* Requires a pointer to the base of an object. */ +/* If the argument is stubborn, it should not be changeable when freed. */ +/* An object should not be enable for finalization when it is */ +/* explicitly deallocated. */ +/* GC_free(0) is a no-op, as required by ANSI C for free. */ +GC_API void GC_free GC_PROTO((GC_PTR object_addr)); + +/* + * Stubborn objects may be changed only if the collector is explicitly informed. + * The collector is implicitly informed of coming change when such + * an object is first allocated. The following routines inform the + * collector that an object will no longer be changed, or that it will + * once again be changed. Only nonNIL pointer stores into the object + * are considered to be changes. The argument to GC_end_stubborn_change + * must be exacly the value returned by GC_malloc_stubborn or passed to + * GC_change_stubborn. (In the second case it may be an interior pointer + * within 512 bytes of the beginning of the objects.) + * There is a performance penalty for allowing more than + * one stubborn object to be changed at once, but it is acceptable to + * do so. The same applies to dropping stubborn objects that are still + * changeable. + */ +GC_API void GC_change_stubborn GC_PROTO((GC_PTR)); +GC_API void GC_end_stubborn_change GC_PROTO((GC_PTR)); + +/* Return a pointer to the base (lowest address) of an object given */ +/* a pointer to a location within the object. */ +/* Return 0 if displaced_pointer doesn't point to within a valid */ +/* object. */ +GC_API GC_PTR GC_base GC_PROTO((GC_PTR displaced_pointer)); + +/* Given a pointer to the base of an object, return its size in bytes. */ +/* The returned size may be slightly larger than what was originally */ +/* requested. */ +GC_API size_t GC_size GC_PROTO((GC_PTR object_addr)); + +/* For compatibility with C library. This is occasionally faster than */ +/* a malloc followed by a bcopy. But if you rely on that, either here */ +/* or with the standard C library, your code is broken. In my */ +/* opinion, it shouldn't have been invented, but now we're stuck. -HB */ +/* The resulting object has the same kind as the original. */ +/* If the argument is stubborn, the result will have changes enabled. */ +/* It is an error to have changes enabled for the original object. */ +/* Follows ANSI comventions for NULL old_object. */ +GC_API GC_PTR GC_realloc + GC_PROTO((GC_PTR old_object, size_t new_size_in_bytes)); + +/* Explicitly increase the heap size. */ +/* Returns 0 on failure, 1 on success. */ +GC_API int GC_expand_hp GC_PROTO((size_t number_of_bytes)); + +/* Limit the heap size to n bytes. Useful when you're debugging, */ +/* especially on systems that don't handle running out of memory well. */ +/* n == 0 ==> unbounded. This is the default. */ +GC_API void GC_set_max_heap_size GC_PROTO((GC_word n)); + +/* Inform the collector that a certain section of statically allocated */ +/* memory contains no pointers to garbage collected memory. Thus it */ +/* need not be scanned. This is sometimes important if the application */ +/* maps large read/write files into the address space, which could be */ +/* mistaken for dynamic library data segments on some systems. */ +GC_API void GC_exclude_static_roots GC_PROTO((GC_PTR start, GC_PTR finish)); + +/* Clear the set of root segments. Wizards only. */ +GC_API void GC_clear_roots GC_PROTO((void)); + +/* Add a root segment. Wizards only. */ +GC_API void GC_add_roots GC_PROTO((char * low_address, + char * high_address_plus_1)); + +/* Add a displacement to the set of those considered valid by the */ +/* collector. GC_register_displacement(n) means that if p was returned */ +/* by GC_malloc, then (char *)p + n will be considered to be a valid */ +/* pointer to n. N must be small and less than the size of p. */ +/* (All pointers to the interior of objects from the stack are */ +/* considered valid in any case. This applies to heap objects and */ +/* static data.) */ +/* Preferably, this should be called before any other GC procedures. */ +/* Calling it later adds to the probability of excess memory */ +/* retention. */ +/* This is a no-op if the collector was compiled with recognition of */ +/* arbitrary interior pointers enabled, which is now the default. */ +GC_API void GC_register_displacement GC_PROTO((GC_word n)); + +/* The following version should be used if any debugging allocation is */ +/* being done. */ +GC_API void GC_debug_register_displacement GC_PROTO((GC_word n)); + +/* Explicitly trigger a full, world-stop collection. */ +GC_API void GC_gcollect GC_PROTO((void)); + +/* Trigger a full world-stopped collection. Abort the collection if */ +/* and when stop_func returns a nonzero value. Stop_func will be */ +/* called frequently, and should be reasonably fast. This works even */ +/* if virtual dirty bits, and hence incremental collection is not */ +/* available for this architecture. Collections can be aborted faster */ +/* than normal pause times for incremental collection. However, */ +/* aborted collections do no useful work; the next collection needs */ +/* to start from the beginning. */ +/* Return 0 if the collection was aborted, 1 if it succeeded. */ +typedef int (* GC_stop_func) GC_PROTO((void)); +GC_API int GC_try_to_collect GC_PROTO((GC_stop_func stop_func)); + +/* Return the number of bytes in the heap. Excludes collector private */ +/* data structures. Includes empty blocks and fragmentation loss. */ +/* Includes some pages that were allocated but never written. */ +GC_API size_t GC_get_heap_size GC_PROTO((void)); + +/* Return a lower bound on the number of free bytes in the heap. */ +GC_API size_t GC_get_free_bytes GC_PROTO((void)); + +/* Return the number of bytes allocated since the last collection. */ +GC_API size_t GC_get_bytes_since_gc GC_PROTO((void)); + +/* Enable incremental/generational collection. */ +/* Not advisable unless dirty bits are */ +/* available or most heap objects are */ +/* pointerfree(atomic) or immutable. */ +/* Don't use in leak finding mode. */ +/* Ignored if GC_dont_gc is true. */ +GC_API void GC_enable_incremental GC_PROTO((void)); + +/* Perform some garbage collection work, if appropriate. */ +/* Return 0 if there is no more work to be done. */ +/* Typically performs an amount of work corresponding roughly */ +/* to marking from one page. May do more work if further */ +/* progress requires it, e.g. if incremental collection is */ +/* disabled. It is reasonable to call this in a wait loop */ +/* until it returns 0. */ +GC_API int GC_collect_a_little GC_PROTO((void)); + +/* Allocate an object of size lb bytes. The client guarantees that */ +/* as long as the object is live, it will be referenced by a pointer */ +/* that points to somewhere within the first 256 bytes of the object. */ +/* (This should normally be declared volatile to prevent the compiler */ +/* from invalidating this assertion.) This routine is only useful */ +/* if a large array is being allocated. It reduces the chance of */ +/* accidentally retaining such an array as a result of scanning an */ +/* integer that happens to be an address inside the array. (Actually, */ +/* it reduces the chance of the allocator not finding space for such */ +/* an array, since it will try hard to avoid introducing such a false */ +/* reference.) On a SunOS 4.X or MS Windows system this is recommended */ +/* for arrays likely to be larger than 100K or so. For other systems, */ +/* or if the collector is not configured to recognize all interior */ +/* pointers, the threshold is normally much higher. */ +GC_API GC_PTR GC_malloc_ignore_off_page GC_PROTO((size_t lb)); +GC_API GC_PTR GC_malloc_atomic_ignore_off_page GC_PROTO((size_t lb)); + +#if defined(__sgi) && !defined(__GNUC__) && _COMPILER_VERSION >= 720 +# define GC_ADD_CALLER +# define GC_RETURN_ADDR (GC_word)__return_address +#endif + +#ifdef GC_ADD_CALLER +# define GC_EXTRAS GC_RETURN_ADDR, __FILE__, __LINE__ +# define GC_EXTRA_PARAMS GC_word ra, GC_CONST char * s, + int i +#else +# define GC_EXTRAS __FILE__, __LINE__ +# define GC_EXTRA_PARAMS GC_CONST char * s, int i +#endif + +/* Debugging (annotated) allocation. GC_gcollect will check */ +/* objects allocated in this way for overwrites, etc. */ +GC_API GC_PTR GC_debug_malloc + GC_PROTO((size_t size_in_bytes, GC_EXTRA_PARAMS)); +GC_API GC_PTR GC_debug_malloc_atomic + GC_PROTO((size_t size_in_bytes, GC_EXTRA_PARAMS)); +GC_API GC_PTR GC_debug_malloc_uncollectable + GC_PROTO((size_t size_in_bytes, GC_EXTRA_PARAMS)); +GC_API GC_PTR GC_debug_malloc_stubborn + GC_PROTO((size_t size_in_bytes, GC_EXTRA_PARAMS)); +GC_API void GC_debug_free GC_PROTO((GC_PTR object_addr)); +GC_API GC_PTR GC_debug_realloc + GC_PROTO((GC_PTR old_object, size_t new_size_in_bytes, + GC_EXTRA_PARAMS)); + +GC_API void GC_debug_change_stubborn GC_PROTO((GC_PTR)); +GC_API void GC_debug_end_stubborn_change GC_PROTO((GC_PTR)); +# ifdef GC_DEBUG +# define GC_MALLOC(sz) GC_debug_malloc(sz, GC_EXTRAS) +# define GC_MALLOC_ATOMIC(sz) GC_debug_malloc_atomic(sz, GC_EXTRAS) +# define GC_MALLOC_UNCOLLECTABLE(sz) GC_debug_malloc_uncollectable(sz, \ + GC_EXTRAS) +# define GC_REALLOC(old, sz) GC_debug_realloc(old, sz, GC_EXTRAS) +# define GC_FREE(p) GC_debug_free(p) +# define GC_REGISTER_FINALIZER(p, f, d, of, od) \ + GC_debug_register_finalizer(p, f, d, of, od) +# define GC_REGISTER_FINALIZER_IGNORE_SELF(p, f, d, of, od) \ + GC_debug_register_finalizer_ignore_self(p, f, d, of, od) +# define GC_REGISTER_FINALIZER_NO_ORDER(p, f, d, of, od) \ + GC_debug_register_finalizer_no_order(p, f, d, of, od) +# define GC_MALLOC_STUBBORN(sz) GC_debug_malloc_stubborn(sz, GC_EXTRAS); +# define GC_CHANGE_STUBBORN(p) GC_debug_change_stubborn(p) +# define GC_END_STUBBORN_CHANGE(p) GC_debug_end_stubborn_change(p) +# define GC_GENERAL_REGISTER_DISAPPEARING_LINK(link, obj) \ + GC_general_register_disappearing_link(link, GC_base(obj)) +# define GC_REGISTER_DISPLACEMENT(n) GC_debug_register_displacement(n) +# else +# define GC_MALLOC(sz) GC_malloc(sz) +# define GC_MALLOC_ATOMIC(sz) GC_malloc_atomic(sz) +# define GC_MALLOC_UNCOLLECTABLE(sz) GC_malloc_uncollectable(sz) +# define GC_REALLOC(old, sz) GC_realloc(old, sz) +# define GC_FREE(p) GC_free(p) +# define GC_REGISTER_FINALIZER(p, f, d, of, od) \ + GC_register_finalizer(p, f, d, of, od) +# define GC_REGISTER_FINALIZER_IGNORE_SELF(p, f, d, of, od) \ + GC_register_finalizer_ignore_self(p, f, d, of, od) +# define GC_REGISTER_FINALIZER_NO_ORDER(p, f, d, of, od) \ + GC_register_finalizer_no_order(p, f, d, of, od) +# define GC_MALLOC_STUBBORN(sz) GC_malloc_stubborn(sz) +# define GC_CHANGE_STUBBORN(p) GC_change_stubborn(p) +# define GC_END_STUBBORN_CHANGE(p) GC_end_stubborn_change(p) +# define GC_GENERAL_REGISTER_DISAPPEARING_LINK(link, obj) \ + GC_general_register_disappearing_link(link, obj) +# define GC_REGISTER_DISPLACEMENT(n) GC_register_displacement(n) +# endif +/* The following are included because they are often convenient, and */ +/* reduce the chance for a misspecifed size argument. But calls may */ +/* expand to something syntactically incorrect if t is a complicated */ +/* type expression. */ +# define GC_NEW(t) (t *)GC_MALLOC(sizeof (t)) +# define GC_NEW_ATOMIC(t) (t *)GC_MALLOC_ATOMIC(sizeof (t)) +# define GC_NEW_STUBBORN(t) (t *)GC_MALLOC_STUBBORN(sizeof (t)) +# define GC_NEW_UNCOLLECTABLE(t) (t *)GC_MALLOC_UNCOLLECTABLE(sizeof (t)) + +/* Finalization. Some of these primitives are grossly unsafe. */ +/* The idea is to make them both cheap, and sufficient to build */ +/* a safer layer, closer to PCedar finalization. */ +/* The interface represents my conclusions from a long discussion */ +/* with Alan Demers, Dan Greene, Carl Hauser, Barry Hayes, */ +/* Christian Jacobi, and Russ Atkinson. It's not perfect, and */ +/* probably nobody else agrees with it. Hans-J. Boehm 3/13/92 */ +typedef void (*GC_finalization_proc) + GC_PROTO((GC_PTR obj, GC_PTR client_data)); + +GC_API void GC_register_finalizer + GC_PROTO((GC_PTR obj, GC_finalization_proc fn, GC_PTR cd, + GC_finalization_proc *ofn, GC_PTR *ocd)); +GC_API void GC_debug_register_finalizer + GC_PROTO((GC_PTR obj, GC_finalization_proc fn, GC_PTR cd, + GC_finalization_proc *ofn, GC_PTR *ocd)); + /* When obj is no longer accessible, invoke */ + /* (*fn)(obj, cd). If a and b are inaccessible, and */ + /* a points to b (after disappearing links have been */ + /* made to disappear), then only a will be */ + /* finalized. (If this does not create any new */ + /* pointers to b, then b will be finalized after the */ + /* next collection.) Any finalizable object that */ + /* is reachable from itself by following one or more */ + /* pointers will not be finalized (or collected). */ + /* Thus cycles involving finalizable objects should */ + /* be avoided, or broken by disappearing links. */ + /* All but the last finalizer registered for an object */ + /* is ignored. */ + /* Finalization may be removed by passing 0 as fn. */ + /* Finalizers are implicitly unregistered just before */ + /* they are invoked. */ + /* The old finalizer and client data are stored in */ + /* *ofn and *ocd. */ + /* Fn is never invoked on an accessible object, */ + /* provided hidden pointers are converted to real */ + /* pointers only if the allocation lock is held, and */ + /* such conversions are not performed by finalization */ + /* routines. */ + /* If GC_register_finalizer is aborted as a result of */ + /* a signal, the object may be left with no */ + /* finalization, even if neither the old nor new */ + /* finalizer were NULL. */ + /* Obj should be the nonNULL starting address of an */ + /* object allocated by GC_malloc or friends. */ + /* Note that any garbage collectable object referenced */ + /* by cd will be considered accessible until the */ + /* finalizer is invoked. */ + +/* Another versions of the above follow. It ignores */ +/* self-cycles, i.e. pointers from a finalizable object to */ +/* itself. There is a stylistic argument that this is wrong, */ +/* but it's unavoidable for C++, since the compiler may */ +/* silently introduce these. It's also benign in that specific */ +/* case. */ +GC_API void GC_register_finalizer_ignore_self + GC_PROTO((GC_PTR obj, GC_finalization_proc fn, GC_PTR cd, + GC_finalization_proc *ofn, GC_PTR *ocd)); +GC_API void GC_debug_register_finalizer_ignore_self + GC_PROTO((GC_PTR obj, GC_finalization_proc fn, GC_PTR cd, + GC_finalization_proc *ofn, GC_PTR *ocd)); + +/* Another version of the above. It ignores all cycles. */ +/* It should probably only be used by Java implementations. */ +GC_API void GC_register_finalizer_no_order + GC_PROTO((GC_PTR obj, GC_finalization_proc fn, GC_PTR cd, + GC_finalization_proc *ofn, GC_PTR *ocd)); +GC_API void GC_debug_register_finalizer_no_order + GC_PROTO((GC_PTR obj, GC_finalization_proc fn, GC_PTR cd, + GC_finalization_proc *ofn, GC_PTR *ocd)); + + +/* The following routine may be used to break cycles between */ +/* finalizable objects, thus causing cyclic finalizable */ +/* objects to be finalized in the correct order. Standard */ +/* use involves calling GC_register_disappearing_link(&p), */ +/* where p is a pointer that is not followed by finalization */ +/* code, and should not be considered in determining */ +/* finalization order. */ +GC_API int GC_register_disappearing_link GC_PROTO((GC_PTR * /* link */)); + /* Link should point to a field of a heap allocated */ + /* object obj. *link will be cleared when obj is */ + /* found to be inaccessible. This happens BEFORE any */ + /* finalization code is invoked, and BEFORE any */ + /* decisions about finalization order are made. */ + /* This is useful in telling the finalizer that */ + /* some pointers are not essential for proper */ + /* finalization. This may avoid finalization cycles. */ + /* Note that obj may be resurrected by another */ + /* finalizer, and thus the clearing of *link may */ + /* be visible to non-finalization code. */ + /* There's an argument that an arbitrary action should */ + /* be allowed here, instead of just clearing a pointer. */ + /* But this causes problems if that action alters, or */ + /* examines connectivity. */ + /* Returns 1 if link was already registered, 0 */ + /* otherwise. */ + /* Only exists for backward compatibility. See below: */ + +GC_API int GC_general_register_disappearing_link + GC_PROTO((GC_PTR * /* link */, GC_PTR obj)); + /* A slight generalization of the above. *link is */ + /* cleared when obj first becomes inaccessible. This */ + /* can be used to implement weak pointers easily and */ + /* safely. Typically link will point to a location */ + /* holding a disguised pointer to obj. (A pointer */ + /* inside an "atomic" object is effectively */ + /* disguised.) In this way soft */ + /* pointers are broken before any object */ + /* reachable from them are finalized. Each link */ + /* May be registered only once, i.e. with one obj */ + /* value. This was added after a long email discussion */ + /* with John Ellis. */ + /* Obj must be a pointer to the first word of an object */ + /* we allocated. It is unsafe to explicitly deallocate */ + /* the object containing link. Explicitly deallocating */ + /* obj may or may not cause link to eventually be */ + /* cleared. */ +GC_API int GC_unregister_disappearing_link GC_PROTO((GC_PTR * /* link */)); + /* Returns 0 if link was not actually registered. */ + /* Undoes a registration by either of the above two */ + /* routines. */ + +/* Auxiliary fns to make finalization work correctly with displaced */ +/* pointers introduced by the debugging allocators. */ +GC_API GC_PTR GC_make_closure GC_PROTO((GC_finalization_proc fn, GC_PTR data)); +GC_API void GC_debug_invoke_finalizer GC_PROTO((GC_PTR obj, GC_PTR data)); + +/* Returns !=0 if GC_invoke_finalizers has something to do. */ +GC_API int GC_should_invoke_finalizers GC_PROTO((void)); + +GC_API int GC_invoke_finalizers GC_PROTO((void)); + /* Run finalizers for all objects that are ready to */ + /* be finalized. Return the number of finalizers */ + /* that were run. Normally this is also called */ + /* implicitly during some allocations. If */ + /* GC-finalize_on_demand is nonzero, it must be called */ + /* explicitly. */ + +/* GC_set_warn_proc can be used to redirect or filter warning messages. */ +/* p may not be a NULL pointer. */ +typedef void (*GC_warn_proc) GC_PROTO((char *msg, GC_word arg)); +GC_API GC_warn_proc GC_set_warn_proc GC_PROTO((GC_warn_proc p)); + /* Returns old warning procedure. */ + +/* The following is intended to be used by a higher level */ +/* (e.g. cedar-like) finalization facility. It is expected */ +/* that finalization code will arrange for hidden pointers to */ +/* disappear. Otherwise objects can be accessed after they */ +/* have been collected. */ +/* Note that putting pointers in atomic objects or in */ +/* nonpointer slots of "typed" objects is equivalent to */ +/* disguising them in this way, and may have other advantages. */ +# if defined(I_HIDE_POINTERS) || defined(GC_I_HIDE_POINTERS) + typedef GC_word GC_hidden_pointer; +# define HIDE_POINTER(p) (~(GC_hidden_pointer)(p)) +# define REVEAL_POINTER(p) ((GC_PTR)(HIDE_POINTER(p))) + /* Converting a hidden pointer to a real pointer requires verifying */ + /* that the object still exists. This involves acquiring the */ + /* allocator lock to avoid a race with the collector. */ +# endif /* I_HIDE_POINTERS */ + +typedef GC_PTR (*GC_fn_type) GC_PROTO((GC_PTR client_data)); +GC_API GC_PTR GC_call_with_alloc_lock + GC_PROTO((GC_fn_type fn, GC_PTR client_data)); + +/* Check that p and q point to the same object. */ +/* Fail conspicuously if they don't. */ +/* Returns the first argument. */ +/* Succeeds if neither p nor q points to the heap. */ +/* May succeed if both p and q point to between heap objects. */ +GC_API GC_PTR GC_same_obj GC_PROTO((GC_PTR p, GC_PTR q)); + +/* Checked pointer pre- and post- increment operations. Note that */ +/* the second argument is in units of bytes, not multiples of the */ +/* object size. This should either be invoked from a macro, or the */ +/* call should be automatically generated. */ +GC_API GC_PTR GC_pre_incr GC_PROTO((GC_PTR *p, size_t how_much)); +GC_API GC_PTR GC_post_incr GC_PROTO((GC_PTR *p, size_t how_much)); + +/* Check that p is visible */ +/* to the collector as a possibly pointer containing location. */ +/* If it isn't fail conspicuously. */ +/* Returns the argument in all cases. May erroneously succeed */ +/* in hard cases. (This is intended for debugging use with */ +/* untyped allocations. The idea is that it should be possible, though */ +/* slow, to add such a call to all indirect pointer stores.) */ +/* Currently useless for multithreaded worlds. */ +GC_API GC_PTR GC_is_visible GC_PROTO((GC_PTR p)); + +/* Check that if p is a pointer to a heap page, then it points to */ +/* a valid displacement within a heap object. */ +/* Fail conspicuously if this property does not hold. */ +/* Uninteresting with ALL_INTERIOR_POINTERS. */ +/* Always returns its argument. */ +GC_API GC_PTR GC_is_valid_displacement GC_PROTO((GC_PTR p)); + +/* Safer, but slow, pointer addition. Probably useful mainly with */ +/* a preprocessor. Useful only for heap pointers. */ +#ifdef GC_DEBUG +# define GC_PTR_ADD3(x, n, type_of_result) \ + ((type_of_result)GC_same_obj((x)+(n), (x))) +# define GC_PRE_INCR3(x, n, type_of_result) \ + ((type_of_result)GC_pre_incr(&(x), (n)*sizeof(*x)) +# define GC_POST_INCR2(x, type_of_result) \ + ((type_of_result)GC_post_incr(&(x), sizeof(*x)) +# ifdef __GNUC__ +# define GC_PTR_ADD(x, n) \ + GC_PTR_ADD3(x, n, typeof(x)) +# define GC_PRE_INCR(x, n) \ + GC_PRE_INCR3(x, n, typeof(x)) +# define GC_POST_INCR(x, n) \ + GC_POST_INCR3(x, typeof(x)) +# else + /* We can't do this right without typeof, which ANSI */ + /* decided was not sufficiently useful. Repeatedly */ + /* mentioning the arguments seems too dangerous to be */ + /* useful. So does not casting the result. */ +# define GC_PTR_ADD(x, n) ((x)+(n)) +# endif +#else /* !GC_DEBUG */ +# define GC_PTR_ADD3(x, n, type_of_result) ((x)+(n)) +# define GC_PTR_ADD(x, n) ((x)+(n)) +# define GC_PRE_INCR3(x, n, type_of_result) ((x) += (n)) +# define GC_PRE_INCR(x, n) ((x) += (n)) +# define GC_POST_INCR2(x, n, type_of_result) ((x)++) +# define GC_POST_INCR(x, n) ((x)++) +#endif + +/* Safer assignment of a pointer to a nonstack location. */ +#ifdef GC_DEBUG +# ifdef __STDC__ +# define GC_PTR_STORE(p, q) \ + (*(void **)GC_is_visible(p) = GC_is_valid_displacement(q)) +# else +# define GC_PTR_STORE(p, q) \ + (*(char **)GC_is_visible(p) = GC_is_valid_displacement(q)) +# endif +#else /* !GC_DEBUG */ +# define GC_PTR_STORE(p, q) *((p) = (q)) +#endif + +/* Fynctions called to report pointer checking errors */ +GC_API void (*GC_same_obj_print_proc) GC_PROTO((GC_PTR p, GC_PTR q)); + +GC_API void (*GC_is_valid_displacement_print_proc) + GC_PROTO((GC_PTR p)); + +GC_API void (*GC_is_visible_print_proc) + GC_PROTO((GC_PTR p)); + +#if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS) +# define SOLARIS_THREADS +#endif + +#ifdef SOLARIS_THREADS +/* We need to intercept calls to many of the threads primitives, so */ +/* that we can locate thread stacks and stop the world. */ +/* Note also that the collector cannot see thread specific data. */ +/* Thread specific data should generally consist of pointers to */ +/* uncollectable objects, which are deallocated using the destructor */ +/* facility in thr_keycreate. */ +# include <thread.h> +# include <signal.h> + int GC_thr_create(void *stack_base, size_t stack_size, + void *(*start_routine)(void *), void *arg, long flags, + thread_t *new_thread); + int GC_thr_join(thread_t wait_for, thread_t *departed, void **status); + int GC_thr_suspend(thread_t target_thread); + int GC_thr_continue(thread_t target_thread); + void * GC_dlopen(const char *path, int mode); + +# ifdef _SOLARIS_PTHREADS +# include <pthread.h> + extern int GC_pthread_create(pthread_t *new_thread, + const pthread_attr_t *attr, + void * (*thread_execp)(void *), void *arg); + extern int GC_pthread_join(pthread_t wait_for, void **status); + +# undef thread_t + +# define pthread_join GC_pthread_join +# define pthread_create GC_pthread_create +#endif + +# define thr_create GC_thr_create +# define thr_join GC_thr_join +# define thr_suspend GC_thr_suspend +# define thr_continue GC_thr_continue +# define dlopen GC_dlopen + +# endif /* SOLARIS_THREADS */ + + +#if !defined(USE_LD_WRAP) && \ + (defined(IRIX_THREADS) || defined(LINUX_THREADS) || defined(HPUX_THREADS)) +/* We treat these similarly. */ +# include <pthread.h> +# include <signal.h> + + int GC_pthread_create(pthread_t *new_thread, + const pthread_attr_t *attr, + void *(*start_routine)(void *), void *arg); + int GC_pthread_sigmask(int how, const sigset_t *set, sigset_t *oset); + int GC_pthread_join(pthread_t thread, void **retval); + +# define pthread_create GC_pthread_create +# define pthread_sigmask GC_pthread_sigmask +# define pthread_join GC_pthread_join +# define dlopen GC_dlopen + +#endif /* xxxxx_THREADS */ + +# if defined(PCR) || defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \ + defined(IRIX_THREADS) || defined(LINUX_THREADS) || \ + defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS) + /* Any flavor of threads except SRC_M3. */ +/* This returns a list of objects, linked through their first */ +/* word. Its use can greatly reduce lock contention problems, since */ +/* the allocation lock can be acquired and released many fewer times. */ +/* lb must be large enough to hold the pointer field. */ +GC_PTR GC_malloc_many(size_t lb); +#define GC_NEXT(p) (*(GC_PTR *)(p)) /* Retrieve the next element */ + /* in returned list. */ +extern void GC_thr_init(); /* Needed for Solaris/X86 */ + +#endif /* THREADS && !SRC_M3 */ + +/* + * If you are planning on putting + * the collector in a SunOS 5 dynamic library, you need to call GC_INIT() + * from the statically loaded program section. + * This circumvents a Solaris 2.X (X<=4) linker bug. + */ +#if defined(sparc) || defined(__sparc) +# define GC_INIT() { extern end, etext; \ + GC_noop(&end, &etext); } +#else +# if defined(__CYGWIN32__) && defined(GC_USE_DLL) + /* + * Similarly gnu-win32 DLLs need explicit initialization + */ +# define GC_INIT() { GC_add_roots(DATASTART, DATAEND); } +# else +# define GC_INIT() +# endif +#endif + +#if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \ + || defined(_WIN32) + /* win32S may not free all resources on process exit. */ + /* This explicitly deallocates the heap. */ + GC_API void GC_win32_free_heap (); +#endif + +#ifdef __cplusplus + } /* end of extern "C" */ +#endif + +#endif /* _GC_H */ diff --git a/boehm-gc/gc.man b/boehm-gc/gc.man new file mode 100644 index 00000000000..5409e706550 --- /dev/null +++ b/boehm-gc/gc.man @@ -0,0 +1,80 @@ +.TH GC_MALLOC 1L "12 February 1996" +.SH NAME +GC_malloc, GC_malloc_atomic, GC_free, GC_realloc, GC_enable_incremental, GC_register_finalizer, GC_malloc_ignore_off_page, GC_malloc_atomic_ignore_off_page, GC_set_warn_proc \- Garbage collecting malloc replacement +.SH SYNOPSIS +#include "gc.h" +.br +# define malloc(n) GC_malloc(n) +.br +... malloc(...) ... +.br +.sp +cc ... gc.a +.LP +.SH DESCRIPTION +.I GC_malloc +and +.I GC_free +are plug-in replacements for standard malloc and free. However, +.I +GC_malloc +will attempt to reclaim inaccessible space automatically by invoking a conservative garbage collector at appropriate points. The collector traverses all data structures accessible by following pointers from the machines registers, stack(s), data, and bss segments. Inaccessible structures will be reclaimed. A machine word is considered to be a valid pointer if it is an address inside an object allocated by +.I +GC_malloc +or friends. +.LP +See the documentation in the include file gc_cpp.h for an alternate, C++ specific interface to the garbage collector. +.LP +Unlike the standard implementations of malloc, +.I +GC_malloc +clears the newly allocated storage. +.I +GC_malloc_atomic +does not. Furthermore, it informs the collector that the resulting object will never contain any pointers, and should therefore not be scanned by the collector. +.LP +.I +GC_free +can be used to deallocate objects, but its use is optional, and generally discouraged. +.I +GC_realloc +has the standard realloc semantics. It preserves pointer-free-ness. +.I +GC_register_finalizer +allows for registration of functions that are invoked when an object becomes inaccessible. +.LP +The garbage collector tries to avoid allocating memory at locations that already appear to be referenced before allocation. (Such apparent ``pointers'' are usually large integers and the like that just happen to look like an address.) This may make it hard to allocate very large objects. An attempt to do so may generate a warning. +.LP +.I +GC_malloc_ignore_off_page +and +.I +GC_malloc_atomic_ignore_off_page +inform the collector that the client code will always maintain a pointer to near the beginning of the object (within the first 512 bytes), and that pointers beyond that can be ignored by the collector. This makes it much easier for the collector to place large objects. These are recommended for large object allocation. (Objects expected to be larger than about 100KBytes should be allocated this way.) +.LP +It is also possible to use the collector to find storage leaks in programs destined to be run with standard malloc/free. The collector can be compiled for thread-safe operation. Unlike standard malloc, it is safe to call malloc after a previous malloc call was interrupted by a signal, provided the original malloc call is not resumed. +.LP +The collector may, on rare occasion produce warning messages. On UNIX machines these appear on stderr. Warning messages can be filtered, redirected, or ignored with +.I +GC_set_warn_proc. +This is recommended for production code. See gc.h for details. +.LP +Debugging versions of many of the above routines are provided as macros. Their names are identical to the above, but consist of all capital letters. If GC_DEBUG is defined before gc.h is included, these routines do additional checking, and allow the leak detecting version of the collector to produce slightly more useful output. Without GC_DEBUG defined, they behave exactly like the lower-case versions. +.LP +On some machines, collection will be performed incrementally after a call to +.I +GC_enable_incremental. +This may temporarily write protect pages in the heap. See the README file for more information on how this interacts with system calls that write to the heap. +.LP +Other facilities not discussed here include limited facilities to support incremental collection on machines without appropriate VM support, provisions for providing more explicit object layout information to the garbage collector, more direct support for ``weak'' pointers, support for ``abortable'' garbage collections during idle time, etc. +.LP +.SH "SEE ALSO" +The README and gc.h files in the distribution. More detailed definitions of the functions exported by the collector are given there. (The above list is not complete.) +.LP +Boehm, H., and M. Weiser, "Garbage Collection in an Uncooperative Environment", +\fISoftware Practice & Experience\fP, September 1988, pp. 807-820. +.LP +The malloc(3) man page. +.LP +.SH AUTHOR +Hans-J. Boehm (boehm@parc.xerox.com). Some of the code was written by others, most notably Alan Demers. diff --git a/boehm-gc/gc_alloc.h b/boehm-gc/gc_alloc.h new file mode 100644 index 00000000000..1f1d54aff95 --- /dev/null +++ b/boehm-gc/gc_alloc.h @@ -0,0 +1,380 @@ +/* + * Copyright (c) 1996-1998 by Silicon Graphics. All rights reserved. + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + */ + +// +// This is a C++ header file that is intended to replace the SGI STL +// alloc.h. This assumes SGI STL version < 3.0. +// +// This assumes the collector has been compiled with -DATOMIC_UNCOLLECTABLE +// and -DALL_INTERIOR_POINTERS. We also recommend +// -DREDIRECT_MALLOC=GC_uncollectable_malloc. +// +// Some of this could be faster in the explicit deallocation case. In particular, +// we spend too much time clearing objects on the free lists. That could be avoided. +// +// This uses template classes with static members, and hence does not work +// with g++ 2.7.2 and earlier. +// + +#include "gc.h" + +#ifndef GC_ALLOC_H + +#define GC_ALLOC_H +#define __ALLOC_H // Prevent inclusion of the default version. Ugly. +#define __SGI_STL_ALLOC_H +#define __SGI_STL_INTERNAL_ALLOC_H + +#ifndef __ALLOC +# define __ALLOC alloc +#endif + +#include <stddef.h> +#include <string.h> + +// The following is just replicated from the conventional SGI alloc.h: + +template<class T, class alloc> +class simple_alloc { + +public: + static T *allocate(size_t n) + { return 0 == n? 0 : (T*) alloc::allocate(n * sizeof (T)); } + static T *allocate(void) + { return (T*) alloc::allocate(sizeof (T)); } + static void deallocate(T *p, size_t n) + { if (0 != n) alloc::deallocate(p, n * sizeof (T)); } + static void deallocate(T *p) + { alloc::deallocate(p, sizeof (T)); } +}; + +#include "gc.h" + +// The following need to match collector data structures. +// We can't include gc_priv.h, since that pulls in way too much stuff. +// This should eventually be factored out into another include file. + +extern "C" { + extern void ** const GC_objfreelist_ptr; + extern void ** const GC_aobjfreelist_ptr; + extern void ** const GC_uobjfreelist_ptr; + extern void ** const GC_auobjfreelist_ptr; + + extern void GC_incr_words_allocd(size_t words); + extern void GC_incr_mem_freed(size_t words); + + extern char * GC_generic_malloc_words_small(size_t word, int kind); +} + +// Object kinds; must match PTRFREE, NORMAL, UNCOLLECTABLE, and +// AUNCOLLECTABLE in gc_priv.h. + +enum { GC_PTRFREE = 0, GC_NORMAL = 1, GC_UNCOLLECTABLE = 2, + GC_AUNCOLLECTABLE = 3 }; + +enum { GC_max_fast_bytes = 255 }; + +enum { GC_bytes_per_word = sizeof(char *) }; + +enum { GC_byte_alignment = 8 }; + +enum { GC_word_alignment = GC_byte_alignment/GC_bytes_per_word }; + +inline void * &GC_obj_link(void * p) +{ return *(void **)p; } + +// Compute a number of words >= n+1 bytes. +// The +1 allows for pointers one past the end. +inline size_t GC_round_up(size_t n) +{ + return ((n + GC_byte_alignment)/GC_byte_alignment)*GC_word_alignment; +} + +// The same but don't allow for extra byte. +inline size_t GC_round_up_uncollectable(size_t n) +{ + return ((n + GC_byte_alignment - 1)/GC_byte_alignment)*GC_word_alignment; +} + +template <int dummy> +class GC_aux_template { +public: + // File local count of allocated words. Occasionally this is + // added into the global count. A separate count is necessary since the + // real one must be updated with a procedure call. + static size_t GC_words_recently_allocd; + + // Same for uncollectable mmory. Not yet reflected in either + // GC_words_recently_allocd or GC_non_gc_bytes. + static size_t GC_uncollectable_words_recently_allocd; + + // Similar counter for explicitly deallocated memory. + static size_t GC_mem_recently_freed; + + // Again for uncollectable memory. + static size_t GC_uncollectable_mem_recently_freed; + + static void * GC_out_of_line_malloc(size_t nwords, int kind); +}; + +template <int dummy> +size_t GC_aux_template<dummy>::GC_words_recently_allocd = 0; + +template <int dummy> +size_t GC_aux_template<dummy>::GC_uncollectable_words_recently_allocd = 0; + +template <int dummy> +size_t GC_aux_template<dummy>::GC_mem_recently_freed = 0; + +template <int dummy> +size_t GC_aux_template<dummy>::GC_uncollectable_mem_recently_freed = 0; + +template <int dummy> +void * GC_aux_template<dummy>::GC_out_of_line_malloc(size_t nwords, int kind) +{ + GC_words_recently_allocd += GC_uncollectable_words_recently_allocd; + GC_non_gc_bytes += + GC_bytes_per_word * GC_uncollectable_words_recently_allocd; + GC_uncollectable_words_recently_allocd = 0; + + GC_mem_recently_freed += GC_uncollectable_mem_recently_freed; + GC_non_gc_bytes -= + GC_bytes_per_word * GC_uncollectable_mem_recently_freed; + GC_uncollectable_mem_recently_freed = 0; + + GC_incr_words_allocd(GC_words_recently_allocd); + GC_words_recently_allocd = 0; + + GC_incr_mem_freed(GC_mem_recently_freed); + GC_mem_recently_freed = 0; + + return GC_generic_malloc_words_small(nwords, kind); +} + +typedef GC_aux_template<0> GC_aux; + +// A fast, single-threaded, garbage-collected allocator +// We assume the first word will be immediately overwritten. +// In this version, deallocation is not a noop, and explicit +// deallocation is likely to help performance. +template <int dummy> +class single_client_gc_alloc_template { + public: + static void * allocate(size_t n) + { + size_t nwords = GC_round_up(n); + void ** flh; + void * op; + + if (n > GC_max_fast_bytes) return GC_malloc(n); + flh = GC_objfreelist_ptr + nwords; + if (0 == (op = *flh)) { + return GC_aux::GC_out_of_line_malloc(nwords, GC_NORMAL); + } + *flh = GC_obj_link(op); + GC_aux::GC_words_recently_allocd += nwords; + return op; + } + static void * ptr_free_allocate(size_t n) + { + size_t nwords = GC_round_up(n); + void ** flh; + void * op; + + if (n > GC_max_fast_bytes) return GC_malloc_atomic(n); + flh = GC_aobjfreelist_ptr + nwords; + if (0 == (op = *flh)) { + return GC_aux::GC_out_of_line_malloc(nwords, GC_PTRFREE); + } + *flh = GC_obj_link(op); + GC_aux::GC_words_recently_allocd += nwords; + return op; + } + static void deallocate(void *p, size_t n) + { + size_t nwords = GC_round_up(n); + void ** flh; + + if (n > GC_max_fast_bytes) { + GC_free(p); + } else { + flh = GC_objfreelist_ptr + nwords; + GC_obj_link(p) = *flh; + memset((char *)p + GC_bytes_per_word, 0, + GC_bytes_per_word * (nwords - 1)); + *flh = p; + GC_aux::GC_mem_recently_freed += nwords; + } + } + static void ptr_free_deallocate(void *p, size_t n) + { + size_t nwords = GC_round_up(n); + void ** flh; + + if (n > GC_max_fast_bytes) { + GC_free(p); + } else { + flh = GC_aobjfreelist_ptr + nwords; + GC_obj_link(p) = *flh; + *flh = p; + GC_aux::GC_mem_recently_freed += nwords; + } + } +}; + +typedef single_client_gc_alloc_template<0> single_client_gc_alloc; + +// Once more, for uncollectable objects. +template <int dummy> +class single_client_alloc_template { + public: + static void * allocate(size_t n) + { + size_t nwords = GC_round_up_uncollectable(n); + void ** flh; + void * op; + + if (n > GC_max_fast_bytes) return GC_malloc_uncollectable(n); + flh = GC_uobjfreelist_ptr + nwords; + if (0 == (op = *flh)) { + return GC_aux::GC_out_of_line_malloc(nwords, GC_UNCOLLECTABLE); + } + *flh = GC_obj_link(op); + GC_aux::GC_uncollectable_words_recently_allocd += nwords; + return op; + } + static void * ptr_free_allocate(size_t n) + { + size_t nwords = GC_round_up_uncollectable(n); + void ** flh; + void * op; + + if (n > GC_max_fast_bytes) return GC_malloc_atomic_uncollectable(n); + flh = GC_auobjfreelist_ptr + nwords; + if (0 == (op = *flh)) { + return GC_aux::GC_out_of_line_malloc(nwords, GC_AUNCOLLECTABLE); + } + *flh = GC_obj_link(op); + GC_aux::GC_uncollectable_words_recently_allocd += nwords; + return op; + } + static void deallocate(void *p, size_t n) + { + size_t nwords = GC_round_up_uncollectable(n); + void ** flh; + + if (n > GC_max_fast_bytes) { + GC_free(p); + } else { + flh = GC_uobjfreelist_ptr + nwords; + GC_obj_link(p) = *flh; + *flh = p; + GC_aux::GC_uncollectable_mem_recently_freed += nwords; + } + } + static void ptr_free_deallocate(void *p, size_t n) + { + size_t nwords = GC_round_up_uncollectable(n); + void ** flh; + + if (n > GC_max_fast_bytes) { + GC_free(p); + } else { + flh = GC_auobjfreelist_ptr + nwords; + GC_obj_link(p) = *flh; + *flh = p; + GC_aux::GC_uncollectable_mem_recently_freed += nwords; + } + } +}; + +typedef single_client_alloc_template<0> single_client_alloc; + +template < int dummy > +class gc_alloc_template { + public: + static void * allocate(size_t n) { return GC_malloc(n); } + static void * ptr_free_allocate(size_t n) + { return GC_malloc_atomic(n); } + static void deallocate(void *, size_t) { } + static void ptr_free_deallocate(void *, size_t) { } +}; + +typedef gc_alloc_template < 0 > gc_alloc; + +template < int dummy > +class alloc_template { + public: + static void * allocate(size_t n) { return GC_malloc_uncollectable(n); } + static void * ptr_free_allocate(size_t n) + { return GC_malloc_atomic_uncollectable(n); } + static void deallocate(void *p, size_t) { GC_free(p); } + static void ptr_free_deallocate(void *p, size_t) { GC_free(p); } +}; + +typedef alloc_template < 0 > alloc; + +#ifdef _SGI_SOURCE + +// We want to specialize simple_alloc so that it does the right thing +// for all pointerfree types. At the moment there is no portable way to +// even approximate that. The following approximation should work for +// SGI compilers, and perhaps some others. + +# define __GC_SPECIALIZE(T,alloc) \ +class simple_alloc<T, alloc> { \ +public: \ + static T *allocate(size_t n) \ + { return 0 == n? 0 : \ + (T*) alloc::ptr_free_allocate(n * sizeof (T)); } \ + static T *allocate(void) \ + { return (T*) alloc::ptr_free_allocate(sizeof (T)); } \ + static void deallocate(T *p, size_t n) \ + { if (0 != n) alloc::ptr_free_deallocate(p, n * sizeof (T)); } \ + static void deallocate(T *p) \ + { alloc::ptr_free_deallocate(p, sizeof (T)); } \ +}; + +__GC_SPECIALIZE(char, gc_alloc) +__GC_SPECIALIZE(int, gc_alloc) +__GC_SPECIALIZE(unsigned, gc_alloc) +__GC_SPECIALIZE(float, gc_alloc) +__GC_SPECIALIZE(double, gc_alloc) + +__GC_SPECIALIZE(char, alloc) +__GC_SPECIALIZE(int, alloc) +__GC_SPECIALIZE(unsigned, alloc) +__GC_SPECIALIZE(float, alloc) +__GC_SPECIALIZE(double, alloc) + +__GC_SPECIALIZE(char, single_client_gc_alloc) +__GC_SPECIALIZE(int, single_client_gc_alloc) +__GC_SPECIALIZE(unsigned, single_client_gc_alloc) +__GC_SPECIALIZE(float, single_client_gc_alloc) +__GC_SPECIALIZE(double, single_client_gc_alloc) + +__GC_SPECIALIZE(char, single_client_alloc) +__GC_SPECIALIZE(int, single_client_alloc) +__GC_SPECIALIZE(unsigned, single_client_alloc) +__GC_SPECIALIZE(float, single_client_alloc) +__GC_SPECIALIZE(double, single_client_alloc) + +#ifdef __STL_USE_STD_ALLOCATORS + +???copy stuff from stl_alloc.h or remove it to a different file ??? + +#endif /* __STL_USE_STD_ALLOCATORS */ + +#endif /* _SGI_SOURCE */ + +#endif /* GC_ALLOC_H */ diff --git a/boehm-gc/gc_cpp.h b/boehm-gc/gc_cpp.h new file mode 100644 index 00000000000..36013e135b9 --- /dev/null +++ b/boehm-gc/gc_cpp.h @@ -0,0 +1,299 @@ +#ifndef GC_CPP_H +#define GC_CPP_H +/**************************************************************************** +Copyright (c) 1994 by Xerox Corporation. All rights reserved. + +THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED +OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + +Permission is hereby granted to use or copy this program for any +purpose, provided the above notices are retained on all copies. +Permission to modify the code and to distribute modified code is +granted, provided the above notices are retained, and a notice that +the code was modified is included with the above copyright notice. +**************************************************************************** + +C++ Interface to the Boehm Collector + + John R. Ellis and Jesse Hull + +This interface provides access to the Boehm collector. It provides +basic facilities similar to those described in "Safe, Efficient +Garbage Collection for C++", by John R. Elis and David L. Detlefs +(ftp://ftp.parc.xerox.com/pub/ellis/gc). + +All heap-allocated objects are either "collectable" or +"uncollectable". Programs must explicitly delete uncollectable +objects, whereas the garbage collector will automatically delete +collectable objects when it discovers them to be inaccessible. +Collectable objects may freely point at uncollectable objects and vice +versa. + +Objects allocated with the built-in "::operator new" are uncollectable. + +Objects derived from class "gc" are collectable. For example: + + class A: public gc {...}; + A* a = new A; // a is collectable. + +Collectable instances of non-class types can be allocated using the GC +(or UseGC) placement: + + typedef int A[ 10 ]; + A* a = new (GC) A; + +Uncollectable instances of classes derived from "gc" can be allocated +using the NoGC placement: + + class A: public gc {...}; + A* a = new (NoGC) A; // a is uncollectable. + +Both uncollectable and collectable objects can be explicitly deleted +with "delete", which invokes an object's destructors and frees its +storage immediately. + +A collectable object may have a clean-up function, which will be +invoked when the collector discovers the object to be inaccessible. +An object derived from "gc_cleanup" or containing a member derived +from "gc_cleanup" has a default clean-up function that invokes the +object's destructors. Explicit clean-up functions may be specified as +an additional placement argument: + + A* a = ::new (GC, MyCleanup) A; + +An object is considered "accessible" by the collector if it can be +reached by a path of pointers from static variables, automatic +variables of active functions, or from some object with clean-up +enabled; pointers from an object to itself are ignored. + +Thus, if objects A and B both have clean-up functions, and A points at +B, B is considered accessible. After A's clean-up is invoked and its +storage released, B will then become inaccessible and will have its +clean-up invoked. If A points at B and B points to A, forming a +cycle, then that's considered a storage leak, and neither will be +collectable. See the interface gc.h for low-level facilities for +handling such cycles of objects with clean-up. + +The collector cannot guarrantee that it will find all inaccessible +objects. In practice, it finds almost all of them. + + +Cautions: + +1. Be sure the collector has been augmented with "make c++". + +2. If your compiler supports the new "operator new[]" syntax, then +add -DOPERATOR_NEW_ARRAY to the Makefile. + +If your compiler doesn't support "operator new[]", beware that an +array of type T, where T is derived from "gc", may or may not be +allocated as a collectable object (it depends on the compiler). Use +the explicit GC placement to make the array collectable. For example: + + class A: public gc {...}; + A* a1 = new A[ 10 ]; // collectable or uncollectable? + A* a2 = new (GC) A[ 10 ]; // collectable + +3. The destructors of collectable arrays of objects derived from +"gc_cleanup" will not be invoked properly. For example: + + class A: public gc_cleanup {...}; + A* a = new (GC) A[ 10 ]; // destructors not invoked correctly + +Typically, only the destructor for the first element of the array will +be invoked when the array is garbage-collected. To get all the +destructors of any array executed, you must supply an explicit +clean-up function: + + A* a = new (GC, MyCleanUp) A[ 10 ]; + +(Implementing clean-up of arrays correctly, portably, and in a way +that preserves the correct exception semantics requires a language +extension, e.g. the "gc" keyword.) + +4. Compiler bugs: + +* Solaris 2's CC (SC3.0) doesn't implement t->~T() correctly, so the +destructors of classes derived from gc_cleanup won't be invoked. +You'll have to explicitly register a clean-up function with +new-placement syntax. + +* Evidently cfront 3.0 does not allow destructors to be explicitly +invoked using the ANSI-conforming syntax t->~T(). If you're using +cfront 3.0, you'll have to comment out the class gc_cleanup, which +uses explicit invocation. + +5. GC name conflicts: + +Many other systems seem to use the identifier "GC" as an abbreviation +for "Graphics Context". Since version 5.0, GC placement has been replaced +by UseGC. GC is an alias for UseGC, unless GC_NAME_CONFLICT is defined. + +****************************************************************************/ + +#include "gc.h" + +#ifndef THINK_CPLUS +#define _cdecl +#endif + +#if ! defined( OPERATOR_NEW_ARRAY ) \ + && (__BORLANDC__ >= 0x450 || (__GNUC__ >= 2 && __GNUC_MINOR__ >= 6) \ + || __WATCOMC__ >= 1050) +# define OPERATOR_NEW_ARRAY +#endif + +enum GCPlacement {UseGC, +#ifndef GC_NAME_CONFLICT + GC=UseGC, +#endif + NoGC, PointerFreeGC}; + +class gc {public: + inline void* operator new( size_t size ); + inline void* operator new( size_t size, GCPlacement gcp ); + inline void operator delete( void* obj ); + +#ifdef OPERATOR_NEW_ARRAY + inline void* operator new[]( size_t size ); + inline void* operator new[]( size_t size, GCPlacement gcp ); + inline void operator delete[]( void* obj ); +#endif /* OPERATOR_NEW_ARRAY */ + }; + /* + Instances of classes derived from "gc" will be allocated in the + collected heap by default, unless an explicit NoGC placement is + specified. */ + +class gc_cleanup: virtual public gc {public: + inline gc_cleanup(); + inline virtual ~gc_cleanup(); +private: + inline static void _cdecl cleanup( void* obj, void* clientData );}; + /* + Instances of classes derived from "gc_cleanup" will be allocated + in the collected heap by default. When the collector discovers an + inaccessible object derived from "gc_cleanup" or containing a + member derived from "gc_cleanup", its destructors will be + invoked. */ + +extern "C" {typedef void (*GCCleanUpFunc)( void* obj, void* clientData );} + +inline void* operator new( + size_t size, + GCPlacement gcp, + GCCleanUpFunc cleanup = 0, + void* clientData = 0 ); + /* + Allocates a collectable or uncollected object, according to the + value of "gcp". + + For collectable objects, if "cleanup" is non-null, then when the + allocated object "obj" becomes inaccessible, the collector will + invoke the function "cleanup( obj, clientData )" but will not + invoke the object's destructors. It is an error to explicitly + delete an object allocated with a non-null "cleanup". + + It is an error to specify a non-null "cleanup" with NoGC or for + classes derived from "gc_cleanup" or containing members derived + from "gc_cleanup". */ + +#ifdef OPERATOR_NEW_ARRAY + +inline void* operator new[]( + size_t size, + GCPlacement gcp, + GCCleanUpFunc cleanup = 0, + void* clientData = 0 ); + /* + The operator new for arrays, identical to the above. */ + +#endif /* OPERATOR_NEW_ARRAY */ + +/**************************************************************************** + +Inline implementation + +****************************************************************************/ + +inline void* gc::operator new( size_t size ) { + return GC_MALLOC( size );} + +inline void* gc::operator new( size_t size, GCPlacement gcp ) { + if (gcp == UseGC) + return GC_MALLOC( size ); + else if (gcp == PointerFreeGC) + return GC_MALLOC_ATOMIC( size ); + else + return GC_MALLOC_UNCOLLECTABLE( size );} + +inline void gc::operator delete( void* obj ) { + GC_FREE( obj );} + + +#ifdef OPERATOR_NEW_ARRAY + +inline void* gc::operator new[]( size_t size ) { + return gc::operator new( size );} + +inline void* gc::operator new[]( size_t size, GCPlacement gcp ) { + return gc::operator new( size, gcp );} + +inline void gc::operator delete[]( void* obj ) { + gc::operator delete( obj );} + +#endif /* OPERATOR_NEW_ARRAY */ + + +inline gc_cleanup::~gc_cleanup() { + GC_REGISTER_FINALIZER_IGNORE_SELF( GC_base(this), 0, 0, 0, 0 );} + +inline void gc_cleanup::cleanup( void* obj, void* displ ) { + ((gc_cleanup*) ((char*) obj + (ptrdiff_t) displ))->~gc_cleanup();} + +inline gc_cleanup::gc_cleanup() { + GC_finalization_proc oldProc; + void* oldData; + void* base = GC_base( (void *) this ); + if (0 == base) return; + GC_REGISTER_FINALIZER_IGNORE_SELF( + base, cleanup, (void*) ((char*) this - (char*) base), + &oldProc, &oldData ); + if (0 != oldProc) { + GC_REGISTER_FINALIZER_IGNORE_SELF( base, oldProc, oldData, 0, 0 );}} + +inline void* operator new( + size_t size, + GCPlacement gcp, + GCCleanUpFunc cleanup, + void* clientData ) +{ + void* obj; + + if (gcp == UseGC) { + obj = GC_MALLOC( size ); + if (cleanup != 0) + GC_REGISTER_FINALIZER_IGNORE_SELF( + obj, cleanup, clientData, 0, 0 );} + else if (gcp == PointerFreeGC) { + obj = GC_MALLOC_ATOMIC( size );} + else { + obj = GC_MALLOC_UNCOLLECTABLE( size );}; + return obj;} + + +#ifdef OPERATOR_NEW_ARRAY + +inline void* operator new[]( + size_t size, + GCPlacement gcp, + GCCleanUpFunc cleanup, + void* clientData ) +{ + return ::operator new( size, gcp, cleanup, clientData );} + +#endif /* OPERATOR_NEW_ARRAY */ + + +#endif /* GC_CPP_H */ + diff --git a/boehm-gc/gc_hdrs.h b/boehm-gc/gc_hdrs.h new file mode 100644 index 00000000000..6966a9a1a87 --- /dev/null +++ b/boehm-gc/gc_hdrs.h @@ -0,0 +1,303 @@ +/* + * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers + * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved. + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + */ +/* Boehm, July 11, 1995 11:54 am PDT */ +# ifndef GC_HEADERS_H +# define GC_HEADERS_H +typedef struct hblkhdr hdr; + +# if CPP_WORDSZ != 32 && CPP_WORDSZ < 36 + --> Get a real machine. +# endif + +/* + * The 2 level tree data structure that is used to find block headers. + * If there are more than 32 bits in a pointer, the top level is a hash + * table. + * + * This defines HDR, GET_HDR, and SET_HDR, the main macros used to + * retrieve and set object headers. We also define some variants to + * retrieve 2 unrelated headers in interleaved fashion. This + * slightly improves scheduling. + * + * Since 5.0 alpha 5, we can also take advantage of a header lookup + * cache. This is a locally declared direct mapped cache, used inside + * the marker. The HC_GET_HDR and HC_GET_HDR2 macros use and maintain this + * cache. Assuming we get reasonable hit rates, this shaves a few + * memory references from each pointer validation. + */ + +# if CPP_WORDSZ > 32 +# define HASH_TL +# endif + +/* Define appropriate out-degrees for each of the two tree levels */ +# ifdef SMALL_CONFIG +# define LOG_BOTTOM_SZ 11 + /* Keep top index size reasonable with smaller blocks. */ +# else +# define LOG_BOTTOM_SZ 10 +# endif +# ifndef HASH_TL +# define LOG_TOP_SZ (WORDSZ - LOG_BOTTOM_SZ - LOG_HBLKSIZE) +# else +# define LOG_TOP_SZ 11 +# endif +# define TOP_SZ (1 << LOG_TOP_SZ) +# define BOTTOM_SZ (1 << LOG_BOTTOM_SZ) + +#ifndef SMALL_CONFIG +# define USE_HDR_CACHE +#endif + +/* #define COUNT_HDR_CACHE_HITS */ + +extern hdr * GC_invalid_header; /* header for an imaginary block */ + /* containing no objects. */ + + +/* Check whether p and corresponding hhdr point to long or invalid */ +/* object. If so, advance them to */ +/* beginning of block, or set hhdr to GC_invalid_header. */ +#define ADVANCE(p, hhdr, source) \ + if (IS_FORWARDING_ADDR_OR_NIL(hhdr)) { \ + p = GC_FIND_START(p, hhdr, (word)source); \ + if (p == 0) { \ + hhdr = GC_invalid_header; \ + } else { \ + hhdr = GC_find_header(p); \ + } \ + } + +#ifdef USE_HDR_CACHE + +# ifdef COUNT_HDR_CACHE_HITS + extern word GC_hdr_cache_hits; + extern word GC_hdr_cache_misses; +# define HC_HIT() ++GC_hdr_cache_hits +# define HC_MISS() ++GC_hdr_cache_misses +# else +# define HC_HIT() +# define HC_MISS() +# endif + + typedef struct hce { + word block_addr; /* right shifted by LOG_HBLKSIZE */ + hdr * hce_hdr; + } hdr_cache_entry; + +# define HDR_CACHE_SIZE 8 /* power of 2 */ + +# define DECLARE_HDR_CACHE \ + hdr_cache_entry hdr_cache[HDR_CACHE_SIZE] + +# define INIT_HDR_CACHE BZERO(hdr_cache, sizeof(hdr_cache)); + +# define HCE(h) hdr_cache + (((word)(h) >> LOG_HBLKSIZE) & (HDR_CACHE_SIZE-1)) + +# define HCE_VALID_FOR(hce,h) ((hce) -> block_addr == \ + ((word)(h) >> LOG_HBLKSIZE)) + +# define HCE_HDR(h) ((hce) -> hce_hdr) + + +/* Analogous to GET_HDR, except that in the case of large objects, it */ +/* Returns the header for the object beginning, and updates p. */ +/* Returns &GC_bad_header instead of 0. All of this saves a branch */ +/* in the fast path. */ +# define HC_GET_HDR(p, hhdr, source) \ + { \ + hdr_cache_entry * hce = HCE(p); \ + if (HCE_VALID_FOR(hce, p)) { \ + HC_HIT(); \ + hhdr = hce -> hce_hdr; \ + } else { \ + HC_MISS(); \ + GET_HDR(p, hhdr); \ + ADVANCE(p, hhdr, source); \ + hce -> block_addr = (word)(p) >> LOG_HBLKSIZE; \ + hce -> hce_hdr = hhdr; \ + } \ + } + +# define HC_GET_HDR2(p1, hhdr1, source1, p2, hhdr2, source2) \ + { \ + hdr_cache_entry * hce1 = HCE(p1); \ + hdr_cache_entry * hce2 = HCE(p2); \ + if (HCE_VALID_FOR(hce1, p1)) { \ + HC_HIT(); \ + hhdr1 = hce1 -> hce_hdr; \ + } else { \ + HC_MISS(); \ + GET_HDR(p1, hhdr1); \ + ADVANCE(p1, hhdr1, source1); \ + hce1 -> block_addr = (word)(p1) >> LOG_HBLKSIZE; \ + hce1 -> hce_hdr = hhdr1; \ + } \ + if (HCE_VALID_FOR(hce2, p2)) { \ + HC_HIT(); \ + hhdr2 = hce2 -> hce_hdr; \ + } else { \ + HC_MISS(); \ + GET_HDR(p2, hhdr2); \ + ADVANCE(p2, hhdr2, source2); \ + hce2 -> block_addr = (word)(p2) >> LOG_HBLKSIZE; \ + hce2 -> hce_hdr = hhdr2; \ + } \ + } + +#else /* !USE_HDR_CACHE */ + +# define DECLARE_HDR_CACHE + +# define INIT_HDR_CACHE + +# define HC_GET_HDR(p, hhdr, source) \ + { \ + GET_HDR(p, hhdr); \ + ADVANCE(p, hhdr, source); \ + } + +# define HC_GET_HDR2(p1, hhdr1, source1, p2, hhdr2, source2) \ + { \ + GET_HDR2(p1, hhdr1, p2, hhdr2); \ + ADVANCE(p1, hhdr1, source1); \ + ADVANCE(p2, hhdr2, source2); \ + } + +#endif + +typedef struct bi { + hdr * index[BOTTOM_SZ]; + /* + * The bottom level index contains one of three kinds of values: + * 0 means we're not responsible for this block, + * or this is a block other than the first one in a free block. + * 1 < (long)X <= MAX_JUMP means the block starts at least + * X * HBLKSIZE bytes before the current address. + * A valid pointer points to a hdr structure. (The above can't be + * valid pointers due to the GET_MEM return convention.) + */ + struct bi * asc_link; /* All indices are linked in */ + /* ascending order... */ + struct bi * desc_link; /* ... and in descending order. */ + word key; /* high order address bits. */ +# ifdef HASH_TL + struct bi * hash_link; /* Hash chain link. */ +# endif +} bottom_index; + +/* extern bottom_index GC_all_nils; - really part of GC_arrays */ + +/* extern bottom_index * GC_top_index []; - really part of GC_arrays */ + /* Each entry points to a bottom_index. */ + /* On a 32 bit machine, it points to */ + /* the index for a set of high order */ + /* bits equal to the index. For longer */ + /* addresses, we hash the high order */ + /* bits to compute the index in */ + /* GC_top_index, and each entry points */ + /* to a hash chain. */ + /* The last entry in each chain is */ + /* GC_all_nils. */ + + +# define MAX_JUMP (HBLKSIZE - 1) + +# define HDR_FROM_BI(bi, p) \ + ((bi)->index[((word)(p) >> LOG_HBLKSIZE) & (BOTTOM_SZ - 1)]) +# ifndef HASH_TL +# define BI(p) (GC_top_index \ + [(word)(p) >> (LOG_BOTTOM_SZ + LOG_HBLKSIZE)]) +# define HDR_INNER(p) HDR_FROM_BI(BI(p),p) +# ifdef SMALL_CONFIG +# define HDR(p) GC_find_header((ptr_t)(p)) +# else +# define HDR(p) HDR_INNER(p) +# endif +# define GET_BI(p, bottom_indx) (bottom_indx) = BI(p) +# define GET_HDR(p, hhdr) (hhdr) = HDR(p) +# define SET_HDR(p, hhdr) HDR_INNER(p) = (hhdr) +# define GET_HDR_ADDR(p, ha) (ha) = &(HDR_INNER(p)) +# define GET_HDR2(p1, hhdr1, p2, hhdr2) \ + { GET_HDR(p1, hhdr1); GET_HDR(p2, hhdr2); } +# else /* hash */ +/* Hash function for tree top level */ +# define TL_HASH(hi) ((hi) & (TOP_SZ - 1)) +/* Set bottom_indx to point to the bottom index for address p */ +# define GET_BI(p, bottom_indx) \ + { \ + register word hi = \ + (word)(p) >> (LOG_BOTTOM_SZ + LOG_HBLKSIZE); \ + register bottom_index * _bi = GC_top_index[TL_HASH(hi)]; \ + \ + while (_bi -> key != hi && _bi != GC_all_nils) \ + _bi = _bi -> hash_link; \ + (bottom_indx) = _bi; \ + } +# define GET_HDR_ADDR(p, ha) \ + { \ + register bottom_index * bi; \ + \ + GET_BI(p, bi); \ + (ha) = &(HDR_FROM_BI(bi, p)); \ + } +# define GET_HDR(p, hhdr) { register hdr ** _ha; GET_HDR_ADDR(p, _ha); \ + (hhdr) = *_ha; } +# define SET_HDR(p, hhdr) { register hdr ** _ha; GET_HDR_ADDR(p, _ha); \ + *_ha = (hhdr); } +# define HDR(p) GC_find_header((ptr_t)(p)) + /* And some interleaved versions for two pointers at once. */ + /* This hopefully helps scheduling on processors like IA64. */ +# define GET_BI2(p1, bottom_indx1, p2, bottom_indx2) \ + { \ + register word hi1 = \ + (word)(p1) >> (LOG_BOTTOM_SZ + LOG_HBLKSIZE); \ + register word hi2 = \ + (word)(p2) >> (LOG_BOTTOM_SZ + LOG_HBLKSIZE); \ + register bottom_index * _bi1 = GC_top_index[TL_HASH(hi1)]; \ + register bottom_index * _bi2 = GC_top_index[TL_HASH(hi2)]; \ + \ + while (_bi1 -> key != hi1 && _bi1 != GC_all_nils) \ + _bi1 = _bi1 -> hash_link; \ + while (_bi2 -> key != hi2 && _bi2 != GC_all_nils) \ + _bi2 = _bi2 -> hash_link; \ + (bottom_indx1) = _bi1; \ + (bottom_indx2) = _bi2; \ + } +# define GET_HDR_ADDR2(p1, ha1, p2, ha2) \ + { \ + register bottom_index * bi1; \ + register bottom_index * bi2; \ + \ + GET_BI2(p1, bi1, p2, bi2); \ + (ha1) = &(HDR_FROM_BI(bi1, p1)); \ + (ha2) = &(HDR_FROM_BI(bi2, p2)); \ + } +# define GET_HDR2(p1, hhdr1, p2, hhdr2) \ + { register hdr ** _ha1; \ + register hdr ** _ha2; \ + GET_HDR_ADDR2(p1, _ha1, p2, _ha2); \ + (hhdr1) = *_ha1; \ + (hhdr2) = *_ha2; \ + } +# endif + +/* Is the result a forwarding address to someplace closer to the */ +/* beginning of the block or NIL? */ +# define IS_FORWARDING_ADDR_OR_NIL(hhdr) ((unsigned long) (hhdr) <= MAX_JUMP) + +/* Get an HBLKSIZE aligned address closer to the beginning of the block */ +/* h. Assumes hhdr == HDR(h) and IS_FORWARDING_ADDR(hhdr). */ +# define FORWARDED_ADDR(h, hhdr) ((struct hblk *)(h) - (unsigned long)(hhdr)) +# endif /* GC_HEADERS_H */ diff --git a/boehm-gc/gc_mark.h b/boehm-gc/gc_mark.h new file mode 100644 index 00000000000..3a4908fb908 --- /dev/null +++ b/boehm-gc/gc_mark.h @@ -0,0 +1,342 @@ +/* + * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved. + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + * + */ +/* Boehm, November 7, 1994 4:56 pm PST */ + +/* + * Declarations of mark stack. Needed by marker and client supplied mark + * routines. To be included after gc_priv.h. + */ +#ifndef GC_MARK_H +# define GC_MARK_H + +# ifdef KEEP_BACK_PTRS +# include "dbg_mlc.h" +# endif + +/* A client supplied mark procedure. Returns new mark stack pointer. */ +/* Primary effect should be to push new entries on the mark stack. */ +/* Mark stack pointer values are passed and returned explicitly. */ +/* Global variables decribing mark stack are not necessarily valid. */ +/* (This usually saves a few cycles by keeping things in registers.) */ +/* Assumed to scan about PROC_BYTES on average. If it needs to do */ +/* much more work than that, it should do it in smaller pieces by */ +/* pushing itself back on the mark stack. */ +/* Note that it should always do some work (defined as marking some */ +/* objects) before pushing more than one entry on the mark stack. */ +/* This is required to ensure termination in the event of mark stack */ +/* overflows. */ +/* This procedure is always called with at least one empty entry on the */ +/* mark stack. */ +/* Currently we require that mark procedures look for pointers in a */ +/* subset of the places the conservative marker would. It must be safe */ +/* to invoke the normal mark procedure instead. */ +# define PROC_BYTES 100 +/* The real declarations of the following are in gc_priv.h, so that */ +/* we can avoid scanning the following table. */ +/* +typedef struct ms_entry * (*mark_proc)( word * addr, + struct ms_entry *mark_stack_ptr, + struct ms_entry *mark_stack_limit, + word env ); + +# define LOG_MAX_MARK_PROCS 6 +# define MAX_MARK_PROCS (1 << LOG_MAX_MARK_PROCS) +extern mark_proc GC_mark_procs[MAX_MARK_PROCS]; +*/ + +extern word GC_n_mark_procs; + +/* In a few cases it's necessary to assign statically known indices to */ +/* certain mark procs. Thus we reserve a few for well known clients. */ +/* (This is necessary if mark descriptors are compiler generated.) */ +#define GC_RESERVED_MARK_PROCS 8 +# define GCJ_RESERVED_MARK_PROC_INDEX 0 + +/* Object descriptors on mark stack or in objects. Low order two */ +/* bits are tags distinguishing among the following 4 possibilities */ +/* for the high order 30 bits. */ +#define DS_TAG_BITS 2 +#define DS_TAGS ((1 << DS_TAG_BITS) - 1) +#define DS_LENGTH 0 /* The entire word is a length in bytes that */ + /* must be a multiple of 4. */ +#define DS_BITMAP 1 /* 30 bits are a bitmap describing pointer */ + /* fields. The msb is 1 iff the first word */ + /* is a pointer. */ + /* (This unconventional ordering sometimes */ + /* makes the marker slightly faster.) */ + /* Zeroes indicate definite nonpointers. Ones */ + /* indicate possible pointers. */ + /* Only usable if pointers are word aligned. */ +# define BITMAP_BITS (WORDSZ - DS_TAG_BITS) +#define DS_PROC 2 + /* The objects referenced by this object can be */ + /* pushed on the mark stack by invoking */ + /* PROC(descr). ENV(descr) is passed as the */ + /* last argument. */ +# define PROC(descr) \ + (GC_mark_procs[((descr) >> DS_TAG_BITS) & (MAX_MARK_PROCS-1)]) +# define ENV(descr) \ + ((descr) >> (DS_TAG_BITS + LOG_MAX_MARK_PROCS)) +# define MAX_ENV \ + (((word)1 << (WORDSZ - DS_TAG_BITS - LOG_MAX_MARK_PROCS)) - 1) +# define MAKE_PROC(proc_index, env) \ + (((((env) << LOG_MAX_MARK_PROCS) | (proc_index)) << DS_TAG_BITS) \ + | DS_PROC) +#define DS_PER_OBJECT 3 /* The real descriptor is at the */ + /* byte displacement from the beginning of the */ + /* object given by descr & ~DS_TAGS */ + /* If the descriptor is negative, the real */ + /* descriptor is at (*<object_start>) - */ + /* (descr & ~DS_TAGS) - INDIR_PER_OBJ_BIAS */ + /* The latter alternative can be used if each */ + /* object contains a type descriptor in the */ + /* first word. */ +#define INDIR_PER_OBJ_BIAS 0x10 + +typedef struct ms_entry { + word * mse_start; /* First word of object */ + word mse_descr; /* Descriptor; low order two bits are tags, */ + /* identifying the upper 30 bits as one of the */ + /* following: */ +} mse; + +extern word GC_mark_stack_size; + +extern mse * GC_mark_stack_top; + +extern mse * GC_mark_stack; + +ptr_t GC_find_start(); + +mse * GC_signal_mark_stack_overflow(); + +# ifdef GATHERSTATS +# define ADD_TO_ATOMIC(sz) GC_atomic_in_use += (sz) +# define ADD_TO_COMPOSITE(sz) GC_composite_in_use += (sz) +# else +# define ADD_TO_ATOMIC(sz) +# define ADD_TO_COMPOSITE(sz) +# endif + +/* Push the object obj with corresponding heap block header hhdr onto */ +/* the mark stack. */ +# define PUSH_OBJ(obj, hhdr, mark_stack_top, mark_stack_limit) \ +{ \ + register word _descr = (hhdr) -> hb_descr; \ + \ + if (_descr == 0) { \ + ADD_TO_ATOMIC((hhdr) -> hb_sz); \ + } else { \ + ADD_TO_COMPOSITE((hhdr) -> hb_sz); \ + mark_stack_top++; \ + if (mark_stack_top >= mark_stack_limit) { \ + mark_stack_top = GC_signal_mark_stack_overflow(mark_stack_top); \ + } \ + mark_stack_top -> mse_start = (obj); \ + mark_stack_top -> mse_descr = _descr; \ + } \ +} + +#ifdef PRINT_BLACK_LIST +# define GC_FIND_START(current, hhdr, source) \ + GC_find_start(current, hhdr, source) +#else +# define GC_FIND_START(current, hhdr, source) \ + GC_find_start(current, hhdr) +#endif + +/* Push the contents of current onto the mark stack if it is a valid */ +/* ptr to a currently unmarked object. Mark it. */ +/* If we assumed a standard-conforming compiler, we could probably */ +/* generate the exit_label transparently. */ +# define PUSH_CONTENTS(current, mark_stack_top, mark_stack_limit, \ + source, exit_label) \ +{ \ + hdr * my_hhdr; \ + ptr_t my_current = current; \ + \ + GET_HDR(my_current, my_hhdr); \ + if (IS_FORWARDING_ADDR_OR_NIL(my_hhdr)) { \ + my_current = GC_FIND_START(my_current, my_hhdr, (word)source); \ + if (my_current == 0) goto exit_label; \ + my_hhdr = GC_find_header(my_current); \ + } \ + PUSH_CONTENTS_HDR(my_current, mark_stack_top, mark_stack_limit, \ + source, exit_label, my_hhdr); \ +exit_label: ; \ +} + +/* As above, but use header cache for header lookup. */ +# define HC_PUSH_CONTENTS(current, mark_stack_top, mark_stack_limit, \ + source, exit_label) \ +{ \ + hdr * my_hhdr; \ + ptr_t my_current = current; \ + \ + HC_GET_HDR(my_current, my_hhdr, source); \ + PUSH_CONTENTS_HDR(my_current, mark_stack_top, mark_stack_limit, \ + source, exit_label, my_hhdr); \ +exit_label: ; \ +} + +/* As above, but deal with two pointers in interleaved fashion. */ +# define HC_PUSH_CONTENTS2(current1, current2, mark_stack_top, \ + mark_stack_limit, \ + source1, source2, exit_label1, exit_label2) \ +{ \ + hdr * hhdr1; \ + ptr_t my_current1 = current1; \ + hdr * hhdr2; \ + ptr_t my_current2 = current2; \ + \ + HC_GET_HDR2(my_current1, hhdr1, source1, my_current2, hhdr2, source2); \ + PUSH_CONTENTS_HDR(my_current1, mark_stack_top, mark_stack_limit, \ + source1, exit_label1, hhdr1); \ +exit_label1: ; \ + if (0 != hhdr2) { \ + PUSH_CONTENTS_HDR(my_current2, mark_stack_top, mark_stack_limit, \ + source2, exit_label2, hhdr2); \ + } \ +exit_label2: ; \ +} + +# define PUSH_CONTENTS_HDR(current, mark_stack_top, mark_stack_limit, \ + source, exit_label, hhdr) \ +{ \ + int displ; /* Displacement in block; first bytes, then words */ \ + map_entry_type map_entry; \ + \ + displ = HBLKDISPL(current); \ + map_entry = MAP_ENTRY((hhdr -> hb_map), displ); \ + if (map_entry == OBJ_INVALID) { \ + GC_ADD_TO_BLACK_LIST_NORMAL(current, source); goto exit_label; \ + } \ + displ = BYTES_TO_WORDS(displ); \ + displ -= map_entry; \ + \ + { \ + register word * mark_word_addr = hhdr -> hb_marks + divWORDSZ(displ); \ + register word mark_word = *mark_word_addr; \ + register word mark_bit = (word)1 << modWORDSZ(displ); \ + \ + if (mark_word & mark_bit) { \ + /* Mark bit is already set */ \ + goto exit_label; \ + } \ + GC_STORE_BACK_PTR((ptr_t)source, (ptr_t)HBLKPTR(current) \ + + WORDS_TO_BYTES(displ)); \ + *mark_word_addr = mark_word | mark_bit; \ + } \ + PUSH_OBJ(((word *)(HBLKPTR(current)) + displ), hhdr, \ + mark_stack_top, mark_stack_limit) \ +} + +#if defined(PRINT_BLACK_LIST) || defined(KEEP_BACK_PTRS) +# define PUSH_ONE_CHECKED(p, ip, source) \ + GC_push_one_checked(p, ip, (ptr_t)(source)) +#else +# define PUSH_ONE_CHECKED(p, ip, source) \ + GC_push_one_checked(p, ip) +#endif + +/* + * Push a single value onto mark stack. Mark from the object pointed to by p. + * P is considered valid even if it is an interior pointer. + * Previously marked objects are not pushed. Hence we make progress even + * if the mark stack overflows. + */ +# define GC_PUSH_ONE_STACK(p, source) \ + if ((ptr_t)(p) >= GC_least_plausible_heap_addr \ + && (ptr_t)(p) < GC_greatest_plausible_heap_addr) { \ + PUSH_ONE_CHECKED(p, TRUE, source); \ + } + +/* + * As above, but interior pointer recognition as for + * normal for heap pointers. + */ +# ifdef ALL_INTERIOR_POINTERS +# define AIP TRUE +# else +# define AIP FALSE +# endif +# define GC_PUSH_ONE_HEAP(p,source) \ + if ((ptr_t)(p) >= GC_least_plausible_heap_addr \ + && (ptr_t)(p) < GC_greatest_plausible_heap_addr) { \ + PUSH_ONE_CHECKED(p,AIP,source); \ + } + +/* + * Mark from one finalizable object using the specified + * mark proc. May not mark the object pointed to by + * real_ptr. That is the job of the caller, if appropriate + */ +# define GC_MARK_FO(real_ptr, mark_proc) \ +{ \ + (*(mark_proc))(real_ptr); \ + while (!GC_mark_stack_empty()) GC_mark_from_mark_stack(); \ + if (GC_mark_state != MS_NONE) { \ + GC_set_mark_bit(real_ptr); \ + while (!GC_mark_some((ptr_t)0)); \ + } \ +} + +extern GC_bool GC_mark_stack_too_small; + /* We need a larger mark stack. May be */ + /* set by client supplied mark routines.*/ + +typedef int mark_state_t; /* Current state of marking, as follows:*/ + /* Used to remember where we are during */ + /* concurrent marking. */ + + /* We say something is dirty if it was */ + /* written since the last time we */ + /* retrieved dirty bits. We say it's */ + /* grungy if it was marked dirty in the */ + /* last set of bits we retrieved. */ + + /* Invariant I: all roots and marked */ + /* objects p are either dirty, or point */ + /* to objects q that are either marked */ + /* or a pointer to q appears in a range */ + /* on the mark stack. */ + +# define MS_NONE 0 /* No marking in progress. I holds. */ + /* Mark stack is empty. */ + +# define MS_PUSH_RESCUERS 1 /* Rescuing objects are currently */ + /* being pushed. I holds, except */ + /* that grungy roots may point to */ + /* unmarked objects, as may marked */ + /* grungy objects above scan_ptr. */ + +# define MS_PUSH_UNCOLLECTABLE 2 + /* I holds, except that marked */ + /* uncollectable objects above scan_ptr */ + /* may point to unmarked objects. */ + /* Roots may point to unmarked objects */ + +# define MS_ROOTS_PUSHED 3 /* I holds, mark stack may be nonempty */ + +# define MS_PARTIALLY_INVALID 4 /* I may not hold, e.g. because of M.S. */ + /* overflow. However marked heap */ + /* objects below scan_ptr point to */ + /* marked or stacked objects. */ + +# define MS_INVALID 5 /* I may not hold. */ + +extern mark_state_t GC_mark_state; + +#endif /* GC_MARK_H */ + diff --git a/boehm-gc/gc_priv.h b/boehm-gc/gc_priv.h new file mode 100644 index 00000000000..eabb85f0c20 --- /dev/null +++ b/boehm-gc/gc_priv.h @@ -0,0 +1,1884 @@ +/* + * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers + * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved. + * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved. + * Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved. + * + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + */ +/* Boehm, February 16, 1996 2:30 pm PST */ + + +# ifndef GC_PRIVATE_H +# define GC_PRIVATE_H + +#if defined(mips) && defined(SYSTYPE_BSD) && defined(sony_news) + /* sony RISC NEWS, NEWSOS 4 */ +# define BSD_TIME +/* typedef long ptrdiff_t; -- necessary on some really old systems */ +#endif + +#if defined(mips) && defined(SYSTYPE_BSD43) + /* MIPS RISCOS 4 */ +# define BSD_TIME +#endif + +#ifdef BSD_TIME +# include <sys/types.h> +# include <sys/time.h> +# include <sys/resource.h> +#endif /* BSD_TIME */ + +# ifndef GC_H +# include "gc.h" +# endif + +typedef GC_word word; +typedef GC_signed_word signed_word; + +# ifndef GCCONFIG_H +# include "gcconfig.h" +# endif + +# ifndef HEADERS_H +# include "gc_hdrs.h" +# endif + +typedef int GC_bool; +# define TRUE 1 +# define FALSE 0 + +typedef char * ptr_t; /* A generic pointer to which we can add */ + /* byte displacements. */ + /* Preferably identical to caddr_t, if it */ + /* exists. */ + +#if defined(__STDC__) +# include <stdlib.h> +# if !(defined( sony_news ) ) +# include <stddef.h> +# endif +# define VOLATILE volatile +#else +# ifdef MSWIN32 +# include <stdlib.h> +# endif +# define VOLATILE +#endif + +#define CONST GC_CONST + +#if 0 /* was once defined for AMIGA */ +# define GC_FAR __far +#else +# define GC_FAR +#endif + + +/*********************************/ +/* */ +/* Definitions for conservative */ +/* collector */ +/* */ +/*********************************/ + +/*********************************/ +/* */ +/* Easily changeable parameters */ +/* */ +/*********************************/ + +#define STUBBORN_ALLOC /* Define stubborn allocation primitives */ +#if defined(SRC_M3) || defined(SMALL_CONFIG) +# undef STUBBORN_ALLOC +#endif + + +/* #define ALL_INTERIOR_POINTERS */ + /* Forces all pointers into the interior of an */ + /* object to be considered valid. Also causes the */ + /* sizes of all objects to be inflated by at least */ + /* one byte. This should suffice to guarantee */ + /* that in the presence of a compiler that does */ + /* not perform garbage-collector-unsafe */ + /* optimizations, all portable, strictly ANSI */ + /* conforming C programs should be safely usable */ + /* with malloc replaced by GC_malloc and free */ + /* calls removed. There are several disadvantages: */ + /* 1. There are probably no interesting, portable, */ + /* strictly ANSI conforming C programs. */ + /* 2. This option makes it hard for the collector */ + /* to allocate space that is not ``pointed to'' */ + /* by integers, etc. Under SunOS 4.X with a */ + /* statically linked libc, we empiricaly */ + /* observed that it would be difficult to */ + /* allocate individual objects larger than 100K. */ + /* Even if only smaller objects are allocated, */ + /* more swap space is likely to be needed. */ + /* Fortunately, much of this will never be */ + /* touched. */ + /* If you can easily avoid using this option, do. */ + /* If not, try to keep individual objects small. */ + +#define PRINTSTATS /* Print garbage collection statistics */ + /* For less verbose output, undefine in reclaim.c */ + +#define PRINTTIMES /* Print the amount of time consumed by each garbage */ + /* collection. */ + +#define PRINTBLOCKS /* Print object sizes associated with heap blocks, */ + /* whether the objects are atomic or composite, and */ + /* whether or not the block was found to be empty */ + /* during the reclaim phase. Typically generates */ + /* about one screenful per garbage collection. */ +#undef PRINTBLOCKS + +#ifdef SILENT +# ifdef PRINTSTATS +# undef PRINTSTATS +# endif +# ifdef PRINTTIMES +# undef PRINTTIMES +# endif +# ifdef PRINTNBLOCKS +# undef PRINTNBLOCKS +# endif +#endif + +#if defined(PRINTSTATS) && !defined(GATHERSTATS) +# define GATHERSTATS +#endif + +#ifdef FINALIZE_ON_DEMAND +# define GC_INVOKE_FINALIZERS() +#else +# define GC_INVOKE_FINALIZERS() (void)GC_invoke_finalizers() +#endif + +#define MERGE_SIZES /* Round up some object sizes, so that fewer distinct */ + /* free lists are actually maintained. This applies */ + /* only to the top level routines in misc.c, not to */ + /* user generated code that calls GC_allocobj and */ + /* GC_allocaobj directly. */ + /* Slows down average programs slightly. May however */ + /* substantially reduce fragmentation if allocation */ + /* request sizes are widely scattered. */ + /* May save significant amounts of space for obj_map */ + /* entries. */ + +/* ALIGN_DOUBLE requires MERGE_SIZES at present. */ +# if defined(ALIGN_DOUBLE) && !defined(MERGE_SIZES) +# define MERGE_SIZES +# endif + +#if defined(ALL_INTERIOR_POINTERS) && !defined(DONT_ADD_BYTE_AT_END) +# define ADD_BYTE_AT_END +#endif + + +# ifndef LARGE_CONFIG +# define MINHINCR 16 /* Minimum heap increment, in blocks of HBLKSIZE */ + /* Must be multiple of largest page size. */ +# define MAXHINCR 512 /* Maximum heap increment, in blocks */ +# else +# define MINHINCR 64 +# define MAXHINCR 4096 +# endif + +# define TIME_LIMIT 50 /* We try to keep pause times from exceeding */ + /* this by much. In milliseconds. */ + +# define BL_LIMIT GC_black_list_spacing + /* If we need a block of N bytes, and we have */ + /* a block of N + BL_LIMIT bytes available, */ + /* and N > BL_LIMIT, */ + /* but all possible positions in it are */ + /* blacklisted, we just use it anyway (and */ + /* print a warning, if warnings are enabled). */ + /* This risks subsequently leaking the block */ + /* due to a false reference. But not using */ + /* the block risks unreasonable immediate */ + /* heap growth. */ + +/*********************************/ +/* */ +/* Stack saving for debugging */ +/* */ +/*********************************/ + +#ifdef SAVE_CALL_CHAIN + +/* + * Number of frames and arguments to save in objects allocated by + * debugging allocator. + */ +# define NFRAMES 6 /* Number of frames to save. Even for */ + /* alignment reasons. */ +# define NARGS 2 /* Mumber of arguments to save for each call. */ + +# define NEED_CALLINFO + +/* Fill in the pc and argument information for up to NFRAMES of my */ +/* callers. Ignore my frame and my callers frame. */ +void GC_save_callers (/* struct callinfo info[NFRAMES] */); + +void GC_print_callers (/* struct callinfo info[NFRAMES] */); + +#else + +# ifdef GC_ADD_CALLER +# define NFRAMES 1 +# define NARGS 0 +# define NEED_CALLINFO +# endif + +#endif + +#ifdef NEED_CALLINFO + struct callinfo { + word ci_pc; +# if NARGS > 0 + word ci_arg[NARGS]; /* bit-wise complement to avoid retention */ +# endif +# if defined(ALIGN_DOUBLE) && (NFRAMES * (NARGS + 1)) % 2 == 1 + /* Likely alignment problem. */ + word ci_dummy; +# endif + }; +#endif + + +/*********************************/ +/* */ +/* OS interface routines */ +/* */ +/*********************************/ + +#ifdef BSD_TIME +# undef CLOCK_TYPE +# undef GET_TIME +# undef MS_TIME_DIFF +# define CLOCK_TYPE struct timeval +# define GET_TIME(x) { struct rusage rusage; \ + getrusage (RUSAGE_SELF, &rusage); \ + x = rusage.ru_utime; } +# define MS_TIME_DIFF(a,b) ((double) (a.tv_sec - b.tv_sec) * 1000.0 \ + + (double) (a.tv_usec - b.tv_usec) / 1000.0) +#else /* !BSD_TIME */ +# ifdef MSWIN32 +# include <windows.h> +# include <winbase.h> +# define CLOCK_TYPE DWORD +# define GET_TIME(x) x = GetTickCount() +# define MS_TIME_DIFF(a,b) ((long)((a)-(b))) +# else /* !MSWIN32, !BSD_TIME */ +# include <time.h> +# if !defined(__STDC__) && defined(SPARC) && defined(SUNOS4) + clock_t clock(); /* Not in time.h, where it belongs */ +# endif +# if defined(FREEBSD) && !defined(CLOCKS_PER_SEC) +# include <machine/limits.h> +# define CLOCKS_PER_SEC CLK_TCK +# endif +# if !defined(CLOCKS_PER_SEC) +# define CLOCKS_PER_SEC 1000000 +/* + * This is technically a bug in the implementation. ANSI requires that + * CLOCKS_PER_SEC be defined. But at least under SunOS4.1.1, it isn't. + * Also note that the combination of ANSI C and POSIX is incredibly gross + * here. The type clock_t is used by both clock() and times(). But on + * some machines these use different notions of a clock tick, CLOCKS_PER_SEC + * seems to apply only to clock. Hence we use it here. On many machines, + * including SunOS, clock actually uses units of microseconds (which are + * not really clock ticks). + */ +# endif +# define CLOCK_TYPE clock_t +# define GET_TIME(x) x = clock() +# define MS_TIME_DIFF(a,b) ((unsigned long) \ + (1000.0*(double)((a)-(b))/(double)CLOCKS_PER_SEC)) +# endif /* !MSWIN32 */ +#endif /* !BSD_TIME */ + +/* We use bzero and bcopy internally. They may not be available. */ +# if defined(SPARC) && defined(SUNOS4) +# define BCOPY_EXISTS +# endif +# if defined(M68K) && defined(AMIGA) +# define BCOPY_EXISTS +# endif +# if defined(M68K) && defined(NEXT) +# define BCOPY_EXISTS +# endif +# if defined(VAX) +# define BCOPY_EXISTS +# endif +# if defined(AMIGA) +# include <string.h> +# define BCOPY_EXISTS +# endif + +# ifndef BCOPY_EXISTS +# include <string.h> +# define BCOPY(x,y,n) memcpy(y, x, (size_t)(n)) +# define BZERO(x,n) memset(x, 0, (size_t)(n)) +# else +# define BCOPY(x,y,n) bcopy((char *)(x),(char *)(y),(int)(n)) +# define BZERO(x,n) bzero((char *)(x),(int)(n)) +# endif + +/* HBLKSIZE aligned allocation. 0 is taken to mean failure */ +/* space is assumed to be cleared. */ +/* In the case os USE_MMAP, the argument must also be a */ +/* physical page size. */ +/* GET_MEM is currently not assumed to retrieve 0 filled space, */ +/* though we should perhaps take advantage of the case in which */ +/* does. */ +# ifdef PCR + char * real_malloc(); +# define GET_MEM(bytes) HBLKPTR(real_malloc((size_t)bytes + GC_page_size) \ + + GC_page_size-1) +# else +# ifdef OS2 + void * os2_alloc(size_t bytes); +# define GET_MEM(bytes) HBLKPTR((ptr_t)os2_alloc((size_t)bytes \ + + GC_page_size) \ + + GC_page_size-1) +# else +# if defined(AMIGA) || defined(NEXT) || defined(MACOSX) || defined(DOS4GW) +# define GET_MEM(bytes) HBLKPTR((size_t) \ + calloc(1, (size_t)bytes + GC_page_size) \ + + GC_page_size-1) +# else +# ifdef MSWIN32 + extern ptr_t GC_win32_get_mem(); +# define GET_MEM(bytes) (struct hblk *)GC_win32_get_mem(bytes) +# else +# ifdef MACOS +# if defined(USE_TEMPORARY_MEMORY) + extern Ptr GC_MacTemporaryNewPtr(size_t size, + Boolean clearMemory); +# define GET_MEM(bytes) HBLKPTR( \ + GC_MacTemporaryNewPtr(bytes + GC_page_size, true) \ + + GC_page_size-1) +# else +# define GET_MEM(bytes) HBLKPTR( \ + NewPtrClear(bytes + GC_page_size) + GC_page_size-1) +# endif +# else + extern ptr_t GC_unix_get_mem(); +# define GET_MEM(bytes) (struct hblk *)GC_unix_get_mem(bytes) +# endif +# endif +# endif +# endif +# endif + +/* + * Mutual exclusion between allocator/collector routines. + * Needed if there is more than one allocator thread. + * FASTLOCK() is assumed to try to acquire the lock in a cheap and + * dirty way that is acceptable for a few instructions, e.g. by + * inhibiting preemption. This is assumed to have succeeded only + * if a subsequent call to FASTLOCK_SUCCEEDED() returns TRUE. + * FASTUNLOCK() is called whether or not FASTLOCK_SUCCEEDED(). + * If signals cannot be tolerated with the FASTLOCK held, then + * FASTLOCK should disable signals. The code executed under + * FASTLOCK is otherwise immune to interruption, provided it is + * not restarted. + * DCL_LOCK_STATE declares any local variables needed by LOCK and UNLOCK + * and/or DISABLE_SIGNALS and ENABLE_SIGNALS and/or FASTLOCK. + * (There is currently no equivalent for FASTLOCK.) + */ +# ifdef THREADS +# ifdef PCR_OBSOLETE /* Faster, but broken with multiple lwp's */ +# include "th/PCR_Th.h" +# include "th/PCR_ThCrSec.h" + extern struct PCR_Th_MLRep GC_allocate_ml; +# define DCL_LOCK_STATE PCR_sigset_t GC_old_sig_mask +# define LOCK() PCR_Th_ML_Acquire(&GC_allocate_ml) +# define UNLOCK() PCR_Th_ML_Release(&GC_allocate_ml) +# define FASTLOCK() PCR_ThCrSec_EnterSys() + /* Here we cheat (a lot): */ +# define FASTLOCK_SUCCEEDED() (*(int *)(&GC_allocate_ml) == 0) + /* TRUE if nobody currently holds the lock */ +# define FASTUNLOCK() PCR_ThCrSec_ExitSys() +# endif +# ifdef PCR +# include <base/PCR_Base.h> +# include <th/PCR_Th.h> + extern PCR_Th_ML GC_allocate_ml; +# define DCL_LOCK_STATE \ + PCR_ERes GC_fastLockRes; PCR_sigset_t GC_old_sig_mask +# define LOCK() PCR_Th_ML_Acquire(&GC_allocate_ml) +# define UNLOCK() PCR_Th_ML_Release(&GC_allocate_ml) +# define FASTLOCK() (GC_fastLockRes = PCR_Th_ML_Try(&GC_allocate_ml)) +# define FASTLOCK_SUCCEEDED() (GC_fastLockRes == PCR_ERes_okay) +# define FASTUNLOCK() {\ + if( FASTLOCK_SUCCEEDED() ) PCR_Th_ML_Release(&GC_allocate_ml); } +# endif +# ifdef SRC_M3 + extern word RT0u__inCritical; +# define LOCK() RT0u__inCritical++ +# define UNLOCK() RT0u__inCritical-- +# endif +# ifdef SOLARIS_THREADS +# include <thread.h> +# include <signal.h> + extern mutex_t GC_allocate_ml; +# define LOCK() mutex_lock(&GC_allocate_ml); +# define UNLOCK() mutex_unlock(&GC_allocate_ml); +# endif +# if defined(LINUX_THREADS) +# if defined(I386)|| defined(POWERPC) || defined(ALPHA) || defined(IA64) \ + || defined(M68K) +# include <pthread.h> +# define USE_SPIN_LOCK +# if defined(I386) + inline static int GC_test_and_set(volatile unsigned int *addr) { + int oldval; + /* Note: the "xchg" instruction does not need a "lock" prefix */ + __asm__ __volatile__("xchgl %0, %1" + : "=r"(oldval), "=m"(*(addr)) + : "0"(1), "m"(*(addr))); + return oldval; + } +# endif +# if defined(IA64) + inline static int GC_test_and_set(volatile unsigned int *addr) { + int oldval; + __asm__ __volatile__("xchg4 %0=%1,%2" + : "=r"(oldval), "=m"(*addr) + : "r"(1), "1"(*addr)); + return oldval; + } + inline static void GC_clear(volatile unsigned int *addr) { + __asm__ __volatile__("st4.rel %0=r0" : "=m" (*addr)); + } +# define GC_CLEAR_DEFINED +# endif +# ifdef M68K + /* Contributed by Tony Mantler. I'm not sure how well it was */ + /* tested. */ + inline static int GC_test_and_set(volatile unsigned int *addr) { + char oldval; /* this must be no longer than 8 bits */ + + /* The return value is semi-phony. */ + /* 'tas' sets bit 7 while the return */ + /* value pretends bit 0 was set */ + __asm__ __volatile__( + "tas %1@; sne %0; negb %0" + : "=d" (oldval) + : "a" (addr)); + return oldval; + } +# endif +# if defined(POWERPC) + inline static int GC_test_and_set(volatile unsigned int *addr) { + int oldval; + int temp = 1; // locked value + + __asm__ __volatile__( + "1:\tlwarx %0,0,%3\n" // load and reserve + "\tcmpwi %0, 0\n" // if load is + "\tbne 2f\n" // non-zero, return already set + "\tstwcx. %2,0,%1\n" // else store conditional + "\tbne- 1b\n" // retry if lost reservation + "2:\t\n" // oldval is zero if we set + : "=&r"(oldval), "=p"(addr) + : "r"(temp), "1"(addr) + : "memory"); + return (int)oldval; + } + inline static void GC_clear(volatile unsigned int *addr) { + __asm__ __volatile__("eieio"); + *(addr) = 0; + } +# define GC_CLEAR_DEFINED +# endif +# ifdef ALPHA + inline static int GC_test_and_set(volatile unsigned int * addr) + { + unsigned long oldvalue; + unsigned long temp; + + __asm__ __volatile__( + "1: ldl_l %0,%1\n" + " and %0,%3,%2\n" + " bne %2,2f\n" + " xor %0,%3,%0\n" + " stl_c %0,%1\n" + " beq %0,3f\n" + " mb\n" + "2:\n" + ".section .text2,\"ax\"\n" + "3: br 1b\n" + ".previous" + :"=&r" (temp), "=m" (*addr), "=&r" (oldvalue) + :"Ir" (1), "m" (*addr)); + + return oldvalue; + } + /* Should probably also define GC_clear, since it needs */ + /* a memory barrier ?? */ +# endif /* ALPHA */ +# ifdef ARM32 + inline static int GC_test_and_set(volatile unsigned int *addr) { + int oldval; + /* SWP on ARM is very similar to XCHG on x86. Doesn't lock the + * bus because there are no SMP ARM machines. If/when there are, + * this code will likely need to be updated. */ + /* See linuxthreads/sysdeps/arm/pt-machine.h in glibc-2.1 */ + __asm__ __volatile__("swp %0, %1, [%2]" + : "=r"(oldval) + : "r"(1), "r"(addr)); + return oldval; + } +# endif +# ifndef GC_CLEAR_DEFINED + inline static void GC_clear(volatile unsigned int *addr) { + /* Try to discourage gcc from moving anything past this. */ + __asm__ __volatile__(" "); + *(addr) = 0; + } +# endif + + extern volatile unsigned int GC_allocate_lock; + extern pthread_t GC_lock_holder; + extern void GC_lock(void); + /* Allocation lock holder. Only set if acquired by client through */ + /* GC_call_with_alloc_lock. */ +# define SET_LOCK_HOLDER() GC_lock_holder = pthread_self() +# define NO_THREAD (pthread_t)(-1) +# define UNSET_LOCK_HOLDER() GC_lock_holder = NO_THREAD +# define I_HOLD_LOCK() (pthread_equal(GC_lock_holder, pthread_self())) +# define LOCK() \ + { if (GC_test_and_set(&GC_allocate_lock)) GC_lock(); } +# define UNLOCK() \ + GC_clear(&GC_allocate_lock) + extern VOLATILE GC_bool GC_collecting; +# define ENTER_GC() \ + { \ + GC_collecting = 1; \ + } +# define EXIT_GC() GC_collecting = 0; +# else /* LINUX_THREADS on hardware for which we don't know how */ + /* to do test and set. */ +# include <pthread.h> + extern pthread_mutex_t GC_allocate_ml; +# define LOCK() pthread_mutex_lock(&GC_allocate_ml) +# define UNLOCK() pthread_mutex_unlock(&GC_allocate_ml) +# endif +# endif /* LINUX_THREADS */ +# if defined(HPUX_THREADS) +# include <pthread.h> + extern pthread_mutex_t GC_allocate_ml; +# define LOCK() pthread_mutex_lock(&GC_allocate_ml) +# define UNLOCK() pthread_mutex_unlock(&GC_allocate_ml) +# endif +# if defined(IRIX_THREADS) || defined(IRIX_JDK_THREADS) + /* This may also eventually be appropriate for HPUX_THREADS */ +# include <pthread.h> +# ifndef HPUX_THREADS + /* This probably should never be included, but I can't test */ + /* on Irix anymore. */ +# include <mutex.h> +# endif + +# ifndef HPUX_THREADS +# if __mips < 3 || !(defined (_ABIN32) || defined(_ABI64)) \ + || !defined(_COMPILER_VERSION) || _COMPILER_VERSION < 700 +# define GC_test_and_set(addr, v) test_and_set(addr,v) +# else +# define GC_test_and_set(addr, v) __test_and_set(addr,v) +# endif +# else + /* I couldn't find a way to do this inline on HP/UX */ +# endif + extern unsigned long GC_allocate_lock; + /* This is not a mutex because mutexes that obey the (optional) */ + /* POSIX scheduling rules are subject to convoys in high contention */ + /* applications. This is basically a spin lock. */ + extern pthread_t GC_lock_holder; + extern void GC_lock(void); + /* Allocation lock holder. Only set if acquired by client through */ + /* GC_call_with_alloc_lock. */ +# define SET_LOCK_HOLDER() GC_lock_holder = pthread_self() +# define NO_THREAD (pthread_t)(-1) +# define UNSET_LOCK_HOLDER() GC_lock_holder = NO_THREAD +# define I_HOLD_LOCK() (pthread_equal(GC_lock_holder, pthread_self())) +# ifdef HPUX_THREADS +# define LOCK() { if (!GC_test_and_clear(&GC_allocate_lock)) GC_lock(); } + /* The following is INCORRECT, since the memory model is too weak. */ +# define UNLOCK() { GC_noop1(&GC_allocate_lock); \ + *(volatile unsigned long *)(&GC_allocate_lock) = 1; } +# else +# define LOCK() { if (GC_test_and_set(&GC_allocate_lock, 1)) GC_lock(); } +# if __mips >= 3 && (defined (_ABIN32) || defined(_ABI64)) \ + && defined(_COMPILER_VERSION) && _COMPILER_VERSION >= 700 +# define UNLOCK() __lock_release(&GC_allocate_lock) +# else + /* The function call in the following should prevent the */ + /* compiler from moving assignments to below the UNLOCK. */ + /* This is probably not necessary for ucode or gcc 2.8. */ + /* It may be necessary for Ragnarok and future gcc */ + /* versions. */ +# define UNLOCK() { GC_noop1(&GC_allocate_lock); \ + *(volatile unsigned long *)(&GC_allocate_lock) = 0; } +# endif +# endif + extern VOLATILE GC_bool GC_collecting; +# define ENTER_GC() \ + { \ + GC_collecting = 1; \ + } +# define EXIT_GC() GC_collecting = 0; +# endif /* IRIX_THREADS || IRIX_JDK_THREADS */ +# ifdef WIN32_THREADS +# include <windows.h> + GC_API CRITICAL_SECTION GC_allocate_ml; +# define LOCK() EnterCriticalSection(&GC_allocate_ml); +# define UNLOCK() LeaveCriticalSection(&GC_allocate_ml); +# endif +# ifndef SET_LOCK_HOLDER +# define SET_LOCK_HOLDER() +# define UNSET_LOCK_HOLDER() +# define I_HOLD_LOCK() FALSE + /* Used on platforms were locks can be reacquired, */ + /* so it doesn't matter if we lie. */ +# endif +# else +# define LOCK() +# define UNLOCK() +# endif +# ifndef SET_LOCK_HOLDER +# define SET_LOCK_HOLDER() +# define UNSET_LOCK_HOLDER() +# define I_HOLD_LOCK() FALSE + /* Used on platforms were locks can be reacquired, */ + /* so it doesn't matter if we lie. */ +# endif +# ifndef ENTER_GC +# define ENTER_GC() +# define EXIT_GC() +# endif + +# ifndef DCL_LOCK_STATE +# define DCL_LOCK_STATE +# endif +# ifndef FASTLOCK +# define FASTLOCK() LOCK() +# define FASTLOCK_SUCCEEDED() TRUE +# define FASTUNLOCK() UNLOCK() +# endif + +/* Delay any interrupts or signals that may abort this thread. Data */ +/* structures are in a consistent state outside this pair of calls. */ +/* ANSI C allows both to be empty (though the standard isn't very */ +/* clear on that point). Standard malloc implementations are usually */ +/* neither interruptable nor thread-safe, and thus correspond to */ +/* empty definitions. */ +# ifdef PCR +# define DISABLE_SIGNALS() \ + PCR_Th_SetSigMask(PCR_allSigsBlocked,&GC_old_sig_mask) +# define ENABLE_SIGNALS() \ + PCR_Th_SetSigMask(&GC_old_sig_mask, NIL) +# else +# if defined(SRC_M3) || defined(AMIGA) || defined(SOLARIS_THREADS) \ + || defined(MSWIN32) || defined(MACOS) || defined(DJGPP) \ + || defined(NO_SIGNALS) || defined(IRIX_THREADS) \ + || defined(IRIX_JDK_THREADS) || defined(LINUX_THREADS) + /* Also useful for debugging. */ + /* Should probably use thr_sigsetmask for SOLARIS_THREADS. */ +# define DISABLE_SIGNALS() +# define ENABLE_SIGNALS() +# else +# define DISABLE_SIGNALS() GC_disable_signals() + void GC_disable_signals(); +# define ENABLE_SIGNALS() GC_enable_signals() + void GC_enable_signals(); +# endif +# endif + +/* + * Stop and restart mutator threads. + */ +# ifdef PCR +# include "th/PCR_ThCtl.h" +# define STOP_WORLD() \ + PCR_ThCtl_SetExclusiveMode(PCR_ThCtl_ExclusiveMode_stopNormal, \ + PCR_allSigsBlocked, \ + PCR_waitForever) +# define START_WORLD() \ + PCR_ThCtl_SetExclusiveMode(PCR_ThCtl_ExclusiveMode_null, \ + PCR_allSigsBlocked, \ + PCR_waitForever); +# else +# if defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \ + || defined(IRIX_THREADS) || defined(LINUX_THREADS) \ + || defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS) + void GC_stop_world(); + void GC_start_world(); +# define STOP_WORLD() GC_stop_world() +# define START_WORLD() GC_start_world() +# else +# define STOP_WORLD() +# define START_WORLD() +# endif +# endif + +/* Abandon ship */ +# ifdef PCR +# define ABORT(s) PCR_Base_Panic(s) +# else +# ifdef SMALL_CONFIG +# define ABORT(msg) abort(); +# else + GC_API void GC_abort(); +# define ABORT(msg) GC_abort(msg); +# endif +# endif + +/* Exit abnormally, but without making a mess (e.g. out of memory) */ +# ifdef PCR +# define EXIT() PCR_Base_Exit(1,PCR_waitForever) +# else +# define EXIT() (void)exit(1) +# endif + +/* Print warning message, e.g. almost out of memory. */ +# define WARN(msg,arg) (*GC_current_warn_proc)(msg, (GC_word)(arg)) +extern GC_warn_proc GC_current_warn_proc; + +/*********************************/ +/* */ +/* Word-size-dependent defines */ +/* */ +/*********************************/ + +#if CPP_WORDSZ == 32 +# define WORDS_TO_BYTES(x) ((x)<<2) +# define BYTES_TO_WORDS(x) ((x)>>2) +# define LOGWL ((word)5) /* log[2] of CPP_WORDSZ */ +# define modWORDSZ(n) ((n) & 0x1f) /* n mod size of word */ +# if ALIGNMENT != 4 +# define UNALIGNED +# endif +#endif + +#if CPP_WORDSZ == 64 +# define WORDS_TO_BYTES(x) ((x)<<3) +# define BYTES_TO_WORDS(x) ((x)>>3) +# define LOGWL ((word)6) /* log[2] of CPP_WORDSZ */ +# define modWORDSZ(n) ((n) & 0x3f) /* n mod size of word */ +# if ALIGNMENT != 8 +# define UNALIGNED +# endif +#endif + +#define WORDSZ ((word)CPP_WORDSZ) +#define SIGNB ((word)1 << (WORDSZ-1)) +#define BYTES_PER_WORD ((word)(sizeof (word))) +#define ONES ((word)(-1)) +#define divWORDSZ(n) ((n) >> LOGWL) /* divide n by size of word */ + +/*********************/ +/* */ +/* Size Parameters */ +/* */ +/*********************/ + +/* heap block size, bytes. Should be power of 2 */ + +#ifndef HBLKSIZE +# ifdef SMALL_CONFIG +# define CPP_LOG_HBLKSIZE 10 +# else +# if CPP_WORDSZ == 32 +# define CPP_LOG_HBLKSIZE 12 +# else +# define CPP_LOG_HBLKSIZE 13 +# endif +# endif +#else +# if HBLKSIZE == 512 +# define CPP_LOG_HBLKSIZE 9 +# endif +# if HBLKSIZE == 1024 +# define CPP_LOG_HBLKSIZE 10 +# endif +# if HBLKSIZE == 2048 +# define CPP_LOG_HBLKSIZE 11 +# endif +# if HBLKSIZE == 4096 +# define CPP_LOG_HBLKSIZE 12 +# endif +# if HBLKSIZE == 8192 +# define CPP_LOG_HBLKSIZE 13 +# endif +# if HBLKSIZE == 16384 +# define CPP_LOG_HBLKSIZE 14 +# endif +# ifndef CPP_LOG_HBLKSIZE + --> fix HBLKSIZE +# endif +# undef HBLKSIZE +#endif +# define CPP_HBLKSIZE (1 << CPP_LOG_HBLKSIZE) +# define LOG_HBLKSIZE ((word)CPP_LOG_HBLKSIZE) +# define HBLKSIZE ((word)CPP_HBLKSIZE) + + +/* max size objects supported by freelist (larger objects may be */ +/* allocated, but less efficiently) */ + +#define CPP_MAXOBJSZ BYTES_TO_WORDS(CPP_HBLKSIZE/2) +#define MAXOBJSZ ((word)CPP_MAXOBJSZ) + +# define divHBLKSZ(n) ((n) >> LOG_HBLKSIZE) + +# define HBLK_PTR_DIFF(p,q) divHBLKSZ((ptr_t)p - (ptr_t)q) + /* Equivalent to subtracting 2 hblk pointers. */ + /* We do it this way because a compiler should */ + /* find it hard to use an integer division */ + /* instead of a shift. The bundled SunOS 4.1 */ + /* o.w. sometimes pessimizes the subtraction to */ + /* involve a call to .div. */ + +# define modHBLKSZ(n) ((n) & (HBLKSIZE-1)) + +# define HBLKPTR(objptr) ((struct hblk *)(((word) (objptr)) & ~(HBLKSIZE-1))) + +# define HBLKDISPL(objptr) (((word) (objptr)) & (HBLKSIZE-1)) + +/* Round up byte allocation requests to integral number of words, etc. */ +# ifdef ADD_BYTE_AT_END +# define ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + WORDS_TO_BYTES(1)) +# ifdef ALIGN_DOUBLE +# define ALIGNED_WORDS(n) (BYTES_TO_WORDS((n) + WORDS_TO_BYTES(2)) & ~1) +# else +# define ALIGNED_WORDS(n) ROUNDED_UP_WORDS(n) +# endif +# define SMALL_OBJ(bytes) ((bytes) < WORDS_TO_BYTES(MAXOBJSZ)) +# define ADD_SLOP(bytes) ((bytes)+1) +# else +# define ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + (WORDS_TO_BYTES(1) - 1)) +# ifdef ALIGN_DOUBLE +# define ALIGNED_WORDS(n) \ + (BYTES_TO_WORDS((n) + WORDS_TO_BYTES(2) - 1) & ~1) +# else +# define ALIGNED_WORDS(n) ROUNDED_UP_WORDS(n) +# endif +# define SMALL_OBJ(bytes) ((bytes) <= WORDS_TO_BYTES(MAXOBJSZ)) +# define ADD_SLOP(bytes) (bytes) +# endif + + +/* + * Hash table representation of sets of pages. This assumes it is + * OK to add spurious entries to sets. + * Used by black-listing code, and perhaps by dirty bit maintenance code. + */ + +# ifdef LARGE_CONFIG +# define LOG_PHT_ENTRIES 17 +# else +# define LOG_PHT_ENTRIES 14 /* Collisions are likely if heap grows */ + /* to more than 16K hblks = 64MB. */ + /* Each hash table occupies 2K bytes. */ +# endif +# define PHT_ENTRIES ((word)1 << LOG_PHT_ENTRIES) +# define PHT_SIZE (PHT_ENTRIES >> LOGWL) +typedef word page_hash_table[PHT_SIZE]; + +# define PHT_HASH(addr) ((((word)(addr)) >> LOG_HBLKSIZE) & (PHT_ENTRIES - 1)) + +# define get_pht_entry_from_index(bl, index) \ + (((bl)[divWORDSZ(index)] >> modWORDSZ(index)) & 1) +# define set_pht_entry_from_index(bl, index) \ + (bl)[divWORDSZ(index)] |= (word)1 << modWORDSZ(index) +# define clear_pht_entry_from_index(bl, index) \ + (bl)[divWORDSZ(index)] &= ~((word)1 << modWORDSZ(index)) + + + +/********************************************/ +/* */ +/* H e a p B l o c k s */ +/* */ +/********************************************/ + +/* heap block header */ +#define HBLKMASK (HBLKSIZE-1) + +#define BITS_PER_HBLK (HBLKSIZE * 8) + +#define MARK_BITS_PER_HBLK (BITS_PER_HBLK/CPP_WORDSZ) + /* upper bound */ + /* We allocate 1 bit/word. Only the first word */ + /* in each object is actually marked. */ + +# ifdef ALIGN_DOUBLE +# define MARK_BITS_SZ (((MARK_BITS_PER_HBLK + 2*CPP_WORDSZ - 1) \ + / (2*CPP_WORDSZ))*2) +# else +# define MARK_BITS_SZ ((MARK_BITS_PER_HBLK + CPP_WORDSZ - 1)/CPP_WORDSZ) +# endif + /* Upper bound on number of mark words per heap block */ + +struct hblkhdr { + word hb_sz; /* If in use, size in words, of objects in the block. */ + /* if free, the size in bytes of the whole block */ + struct hblk * hb_next; /* Link field for hblk free list */ + /* and for lists of chunks waiting to be */ + /* reclaimed. */ + struct hblk * hb_prev; /* Backwards link for free list. */ + word hb_descr; /* object descriptor for marking. See */ + /* mark.h. */ + char* hb_map; /* A pointer to a pointer validity map of the block. */ + /* See GC_obj_map. */ + /* Valid for all blocks with headers. */ + /* Free blocks point to GC_invalid_map. */ + unsigned char hb_obj_kind; + /* Kind of objects in the block. Each kind */ + /* identifies a mark procedure and a set of */ + /* list headers. Sometimes called regions. */ + unsigned char hb_flags; +# define IGNORE_OFF_PAGE 1 /* Ignore pointers that do not */ + /* point to the first page of */ + /* this object. */ +# define WAS_UNMAPPED 2 /* This is a free block, which has */ + /* been unmapped from the address */ + /* space. */ + /* GC_remap must be invoked on it */ + /* before it can be reallocated. */ + /* Only set with USE_MUNMAP. */ + unsigned short hb_last_reclaimed; + /* Value of GC_gc_no when block was */ + /* last allocated or swept. May wrap. */ + /* For a free block, this is maintained */ + /* unly for USE_MUNMAP, and indicates */ + /* when the header was allocated, or */ + /* when the size of the block last */ + /* changed. */ + word hb_marks[MARK_BITS_SZ]; + /* Bit i in the array refers to the */ + /* object starting at the ith word (header */ + /* INCLUDED) in the heap block. */ + /* The lsb of word 0 is numbered 0. */ + /* Unused bits are invalid, and are */ + /* occasionally set, e.g for uncollectable */ + /* objects. */ +}; + +/* heap block body */ + +# define DISCARD_WORDS 0 + /* Number of words to be dropped at the beginning of each block */ + /* Must be a multiple of WORDSZ. May reasonably be nonzero */ + /* on machines that don't guarantee longword alignment of */ + /* pointers, so that the number of false hits is minimized. */ + /* 0 and WORDSZ are probably the only reasonable values. */ + +# define BODY_SZ ((HBLKSIZE-WORDS_TO_BYTES(DISCARD_WORDS))/sizeof(word)) + +struct hblk { +# if (DISCARD_WORDS != 0) + word garbage[DISCARD_WORDS]; +# endif + word hb_body[BODY_SZ]; +}; + +# define HDR_WORDS ((word)DISCARD_WORDS) +# define HDR_BYTES ((word)WORDS_TO_BYTES(DISCARD_WORDS)) + +# define OBJ_SZ_TO_BLOCKS(sz) \ + divHBLKSZ(HDR_BYTES + WORDS_TO_BYTES(sz) + HBLKSIZE-1) + /* Size of block (in units of HBLKSIZE) needed to hold objects of */ + /* given sz (in words). */ + +/* Object free list link */ +# define obj_link(p) (*(ptr_t *)(p)) + +/* The type of mark procedures. This really belongs in gc_mark.h. */ +/* But we put it here, so that we can avoid scanning the mark proc */ +/* table. */ +typedef struct ms_entry * (*mark_proc)(/* word * addr, + struct ms_entry *mark_stack_ptr, + struct ms_entry *mark_stack_limit, + word env */); +# define LOG_MAX_MARK_PROCS 6 +# define MAX_MARK_PROCS (1 << LOG_MAX_MARK_PROCS) + +/* Root sets. Logically private to mark_rts.c. But we don't want the */ +/* tables scanned, so we put them here. */ +/* MAX_ROOT_SETS is the maximum number of ranges that can be */ +/* registered as static roots. */ +# ifdef LARGE_CONFIG +# define MAX_ROOT_SETS 4096 +# else +# ifdef PCR +# define MAX_ROOT_SETS 1024 +# else +# ifdef MSWIN32 +# define MAX_ROOT_SETS 512 + /* Under NT, we add only written pages, which can result */ + /* in many small root sets. */ +# else +# define MAX_ROOT_SETS 64 +# endif +# endif +# endif + +# define MAX_EXCLUSIONS (MAX_ROOT_SETS/4) +/* Maximum number of segments that can be excluded from root sets. */ + +/* + * Data structure for excluded static roots. + */ +struct exclusion { + ptr_t e_start; + ptr_t e_end; +}; + +/* Data structure for list of root sets. */ +/* We keep a hash table, so that we can filter out duplicate additions. */ +/* Under Win32, we need to do a better job of filtering overlaps, so */ +/* we resort to sequential search, and pay the price. */ +struct roots { + ptr_t r_start; + ptr_t r_end; +# ifndef MSWIN32 + struct roots * r_next; +# endif + GC_bool r_tmp; + /* Delete before registering new dynamic libraries */ +}; + +#ifndef MSWIN32 + /* Size of hash table index to roots. */ +# define LOG_RT_SIZE 6 +# define RT_SIZE (1 << LOG_RT_SIZE) /* Power of 2, may be != MAX_ROOT_SETS */ +#endif + +/* Lists of all heap blocks and free lists */ +/* as well as other random data structures */ +/* that should not be scanned by the */ +/* collector. */ +/* These are grouped together in a struct */ +/* so that they can be easily skipped by the */ +/* GC_mark routine. */ +/* The ordering is weird to make GC_malloc */ +/* faster by keeping the important fields */ +/* sufficiently close together that a */ +/* single load of a base register will do. */ +/* Scalars that could easily appear to */ +/* be pointers are also put here. */ +/* The main fields should precede any */ +/* conditionally included fields, so that */ +/* gc_inl.h will work even if a different set */ +/* of macros is defined when the client is */ +/* compiled. */ + +struct _GC_arrays { + word _heapsize; + word _max_heapsize; + word _requested_heapsize; /* Heap size due to explicit expansion */ + ptr_t _last_heap_addr; + ptr_t _prev_heap_addr; + word _large_free_bytes; + /* Total bytes contained in blocks on large object free */ + /* list. */ + word _words_allocd_before_gc; + /* Number of words allocated before this */ + /* collection cycle. */ + word _words_allocd; + /* Number of words allocated during this collection cycle */ + word _words_wasted; + /* Number of words wasted due to internal fragmentation */ + /* in large objects, or due to dropping blacklisted */ + /* blocks, since last gc. Approximate. */ + word _words_finalized; + /* Approximate number of words in objects (and headers) */ + /* That became ready for finalization in the last */ + /* collection. */ + word _non_gc_bytes_at_gc; + /* Number of explicitly managed bytes of storage */ + /* at last collection. */ + word _mem_freed; + /* Number of explicitly deallocated words of memory */ + /* since last collection. */ + ptr_t _scratch_end_ptr; + ptr_t _scratch_last_end_ptr; + /* Used by headers.c, and can easily appear to point to */ + /* heap. */ + mark_proc _mark_procs[MAX_MARK_PROCS]; + /* Table of user-defined mark procedures. There is */ + /* a small number of these, which can be referenced */ + /* by DS_PROC mark descriptors. See gc_mark.h. */ + ptr_t _objfreelist[MAXOBJSZ+1]; + /* free list for objects */ + ptr_t _aobjfreelist[MAXOBJSZ+1]; + /* free list for atomic objs */ + + ptr_t _uobjfreelist[MAXOBJSZ+1]; + /* uncollectable but traced objs */ + /* objects on this and auobjfreelist */ + /* are always marked, except during */ + /* garbage collections. */ +# ifdef ATOMIC_UNCOLLECTABLE + ptr_t _auobjfreelist[MAXOBJSZ+1]; +# endif + /* uncollectable but traced objs */ + +# ifdef GATHERSTATS + word _composite_in_use; + /* Number of words in accessible composite */ + /* objects. */ + word _atomic_in_use; + /* Number of words in accessible atomic */ + /* objects. */ +# endif +# ifdef USE_MUNMAP + word _unmapped_bytes; +# endif +# ifdef MERGE_SIZES + unsigned _size_map[WORDS_TO_BYTES(MAXOBJSZ+1)]; + /* Number of words to allocate for a given allocation request in */ + /* bytes. */ +# endif + +# ifdef STUBBORN_ALLOC + ptr_t _sobjfreelist[MAXOBJSZ+1]; +# endif + /* free list for immutable objects */ + ptr_t _obj_map[MAXOBJSZ+1]; + /* If not NIL, then a pointer to a map of valid */ + /* object addresses. _obj_map[sz][i] is j if the */ + /* address block_start+i is a valid pointer */ + /* to an object at */ + /* block_start+i&~3 - WORDS_TO_BYTES(j). */ + /* (If ALL_INTERIOR_POINTERS is defined, then */ + /* instead ((short *)(hb_map[sz])[i] is j if */ + /* block_start+WORDS_TO_BYTES(i) is in the */ + /* interior of an object starting at */ + /* block_start+WORDS_TO_BYTES(i-j)). */ + /* It is OBJ_INVALID if */ + /* block_start+WORDS_TO_BYTES(i) is not */ + /* valid as a pointer to an object. */ + /* We assume all values of j <= OBJ_INVALID. */ + /* The zeroth entry corresponds to large objects.*/ +# ifdef ALL_INTERIOR_POINTERS +# define map_entry_type short +# define OBJ_INVALID 0x7fff +# define MAP_ENTRY(map, bytes) \ + (((map_entry_type *)(map))[BYTES_TO_WORDS(bytes)]) +# define MAP_ENTRIES BYTES_TO_WORDS(HBLKSIZE) +# define MAP_SIZE (MAP_ENTRIES * sizeof(map_entry_type)) +# define OFFSET_VALID(displ) TRUE +# define CPP_MAX_OFFSET (HBLKSIZE - HDR_BYTES - 1) +# define MAX_OFFSET ((word)CPP_MAX_OFFSET) +# else +# define map_entry_type char +# define OBJ_INVALID 0x7f +# define MAP_ENTRY(map, bytes) \ + (map)[bytes] +# define MAP_ENTRIES HBLKSIZE +# define MAP_SIZE MAP_ENTRIES +# define CPP_MAX_OFFSET (WORDS_TO_BYTES(OBJ_INVALID) - 1) +# define MAX_OFFSET ((word)CPP_MAX_OFFSET) +# define VALID_OFFSET_SZ \ + (CPP_MAX_OFFSET > WORDS_TO_BYTES(CPP_MAXOBJSZ)? \ + CPP_MAX_OFFSET+1 \ + : WORDS_TO_BYTES(CPP_MAXOBJSZ)+1) + char _valid_offsets[VALID_OFFSET_SZ]; + /* GC_valid_offsets[i] == TRUE ==> i */ + /* is registered as a displacement. */ +# define OFFSET_VALID(displ) GC_valid_offsets[displ] + char _modws_valid_offsets[sizeof(word)]; + /* GC_valid_offsets[i] ==> */ + /* GC_modws_valid_offsets[i%sizeof(word)] */ +# endif +# ifdef STUBBORN_ALLOC + page_hash_table _changed_pages; + /* Stubborn object pages that were changes since last call to */ + /* GC_read_changed. */ + page_hash_table _prev_changed_pages; + /* Stubborn object pages that were changes before last call to */ + /* GC_read_changed. */ +# endif +# if defined(PROC_VDB) || defined(MPROTECT_VDB) + page_hash_table _grungy_pages; /* Pages that were dirty at last */ + /* GC_read_dirty. */ +# endif +# ifdef MPROTECT_VDB + VOLATILE page_hash_table _dirty_pages; + /* Pages dirtied since last GC_read_dirty. */ +# endif +# ifdef PROC_VDB + page_hash_table _written_pages; /* Pages ever dirtied */ +# endif +# ifdef LARGE_CONFIG +# if CPP_WORDSZ > 32 +# define MAX_HEAP_SECTS 4096 /* overflows at roughly 64 GB */ +# else +# define MAX_HEAP_SECTS 768 /* Separately added heap sections. */ +# endif +# else +# define MAX_HEAP_SECTS 256 +# endif + struct HeapSect { + ptr_t hs_start; word hs_bytes; + } _heap_sects[MAX_HEAP_SECTS]; +# ifdef MSWIN32 + ptr_t _heap_bases[MAX_HEAP_SECTS]; + /* Start address of memory regions obtained from kernel. */ +# endif + struct roots _static_roots[MAX_ROOT_SETS]; +# ifndef MSWIN32 + struct roots * _root_index[RT_SIZE]; +# endif + struct exclusion _excl_table[MAX_EXCLUSIONS]; + /* Block header index; see gc_headers.h */ + bottom_index * _all_nils; + bottom_index * _top_index [TOP_SZ]; +#ifdef SAVE_CALL_CHAIN + struct callinfo _last_stack[NFRAMES]; /* Stack at last garbage collection.*/ + /* Useful for debugging mysterious */ + /* object disappearances. */ + /* In the multithreaded case, we */ + /* currently only save the calling */ + /* stack. */ +#endif +}; + +GC_API GC_FAR struct _GC_arrays GC_arrays; + +# define GC_objfreelist GC_arrays._objfreelist +# define GC_aobjfreelist GC_arrays._aobjfreelist +# define GC_uobjfreelist GC_arrays._uobjfreelist +# ifdef ATOMIC_UNCOLLECTABLE +# define GC_auobjfreelist GC_arrays._auobjfreelist +# endif +# define GC_sobjfreelist GC_arrays._sobjfreelist +# define GC_valid_offsets GC_arrays._valid_offsets +# define GC_modws_valid_offsets GC_arrays._modws_valid_offsets +# ifdef STUBBORN_ALLOC +# define GC_changed_pages GC_arrays._changed_pages +# define GC_prev_changed_pages GC_arrays._prev_changed_pages +# endif +# define GC_obj_map GC_arrays._obj_map +# define GC_last_heap_addr GC_arrays._last_heap_addr +# define GC_prev_heap_addr GC_arrays._prev_heap_addr +# define GC_words_allocd GC_arrays._words_allocd +# define GC_words_wasted GC_arrays._words_wasted +# define GC_large_free_bytes GC_arrays._large_free_bytes +# define GC_words_finalized GC_arrays._words_finalized +# define GC_non_gc_bytes_at_gc GC_arrays._non_gc_bytes_at_gc +# define GC_mem_freed GC_arrays._mem_freed +# define GC_scratch_end_ptr GC_arrays._scratch_end_ptr +# define GC_scratch_last_end_ptr GC_arrays._scratch_last_end_ptr +# define GC_mark_procs GC_arrays._mark_procs +# define GC_heapsize GC_arrays._heapsize +# define GC_max_heapsize GC_arrays._max_heapsize +# define GC_requested_heapsize GC_arrays._requested_heapsize +# define GC_words_allocd_before_gc GC_arrays._words_allocd_before_gc +# define GC_heap_sects GC_arrays._heap_sects +# define GC_last_stack GC_arrays._last_stack +# ifdef USE_MUNMAP +# define GC_unmapped_bytes GC_arrays._unmapped_bytes +# endif +# ifdef MSWIN32 +# define GC_heap_bases GC_arrays._heap_bases +# endif +# define GC_static_roots GC_arrays._static_roots +# define GC_root_index GC_arrays._root_index +# define GC_excl_table GC_arrays._excl_table +# define GC_all_nils GC_arrays._all_nils +# define GC_top_index GC_arrays._top_index +# if defined(PROC_VDB) || defined(MPROTECT_VDB) +# define GC_grungy_pages GC_arrays._grungy_pages +# endif +# ifdef MPROTECT_VDB +# define GC_dirty_pages GC_arrays._dirty_pages +# endif +# ifdef PROC_VDB +# define GC_written_pages GC_arrays._written_pages +# endif +# ifdef GATHERSTATS +# define GC_composite_in_use GC_arrays._composite_in_use +# define GC_atomic_in_use GC_arrays._atomic_in_use +# endif +# ifdef MERGE_SIZES +# define GC_size_map GC_arrays._size_map +# endif + +# define beginGC_arrays ((ptr_t)(&GC_arrays)) +# define endGC_arrays (((ptr_t)(&GC_arrays)) + (sizeof GC_arrays)) + +#define USED_HEAP_SIZE (GC_heapsize - GC_large_free_bytes) + +/* Object kinds: */ +# define MAXOBJKINDS 16 + +extern struct obj_kind { + ptr_t *ok_freelist; /* Array of free listheaders for this kind of object */ + /* Point either to GC_arrays or to storage allocated */ + /* with GC_scratch_alloc. */ + struct hblk **ok_reclaim_list; + /* List headers for lists of blocks waiting to be */ + /* swept. */ + word ok_descriptor; /* Descriptor template for objects in this */ + /* block. */ + GC_bool ok_relocate_descr; + /* Add object size in bytes to descriptor */ + /* template to obtain descriptor. Otherwise */ + /* template is used as is. */ + GC_bool ok_init; /* Clear objects before putting them on the free list. */ +} GC_obj_kinds[MAXOBJKINDS]; + +# define endGC_obj_kinds (((ptr_t)(&GC_obj_kinds)) + (sizeof GC_obj_kinds)) + +# define end_gc_area ((ptr_t)endGC_arrays == (ptr_t)(&GC_obj_kinds) ? \ + endGC_obj_kinds : endGC_arrays) + +/* Predefined kinds: */ +# define PTRFREE 0 +# define NORMAL 1 +# define UNCOLLECTABLE 2 +# ifdef ATOMIC_UNCOLLECTABLE +# define AUNCOLLECTABLE 3 +# define STUBBORN 4 +# define IS_UNCOLLECTABLE(k) (((k) & ~1) == UNCOLLECTABLE) +# else +# define STUBBORN 3 +# define IS_UNCOLLECTABLE(k) ((k) == UNCOLLECTABLE) +# endif + +extern int GC_n_kinds; + +GC_API word GC_fo_entries; + +extern word GC_n_heap_sects; /* Number of separately added heap */ + /* sections. */ + +extern word GC_page_size; + +# ifdef MSWIN32 +extern word GC_n_heap_bases; /* See GC_heap_bases. */ +# endif + +extern word GC_total_stack_black_listed; + /* Number of bytes on stack blacklist. */ + +extern word GC_black_list_spacing; + /* Average number of bytes between blacklisted */ + /* blocks. Approximate. */ + /* Counts only blocks that are */ + /* "stack-blacklisted", i.e. that are */ + /* problematic in the interior of an object. */ + +extern char * GC_invalid_map; + /* Pointer to the nowhere valid hblk map */ + /* Blocks pointing to this map are free. */ + +extern struct hblk * GC_hblkfreelist[]; + /* List of completely empty heap blocks */ + /* Linked through hb_next field of */ + /* header structure associated with */ + /* block. */ + +extern GC_bool GC_is_initialized; /* GC_init() has been run. */ + +extern GC_bool GC_objects_are_marked; /* There are marked objects in */ + /* the heap. */ + +#ifndef SMALL_CONFIG + extern GC_bool GC_incremental; + /* Using incremental/generational collection. */ +#else +# define GC_incremental TRUE + /* Hopefully allow optimizer to remove some code. */ +#endif + +extern GC_bool GC_dirty_maintained; + /* Dirty bits are being maintained, */ + /* either for incremental collection, */ + /* or to limit the root set. */ + +extern word GC_root_size; /* Total size of registered root sections */ + +extern GC_bool GC_debugging_started; /* GC_debug_malloc has been called. */ + +extern ptr_t GC_least_plausible_heap_addr; +extern ptr_t GC_greatest_plausible_heap_addr; + /* Bounds on the heap. Guaranteed valid */ + /* Likely to include future heap expansion. */ + +/* Operations */ +# ifndef abs +# define abs(x) ((x) < 0? (-(x)) : (x)) +# endif + + +/* Marks are in a reserved area in */ +/* each heap block. Each word has one mark bit associated */ +/* with it. Only those corresponding to the beginning of an */ +/* object are used. */ + + +/* Mark bit operations */ + +/* + * Retrieve, set, clear the mark bit corresponding + * to the nth word in a given heap block. + * + * (Recall that bit n corresponds to object beginning at word n + * relative to the beginning of the block, including unused words) + */ + +# define mark_bit_from_hdr(hhdr,n) (((hhdr)->hb_marks[divWORDSZ(n)] \ + >> (modWORDSZ(n))) & (word)1) +# define set_mark_bit_from_hdr(hhdr,n) (hhdr)->hb_marks[divWORDSZ(n)] \ + |= (word)1 << modWORDSZ(n) + +# define clear_mark_bit_from_hdr(hhdr,n) (hhdr)->hb_marks[divWORDSZ(n)] \ + &= ~((word)1 << modWORDSZ(n)) + +/* Important internal collector routines */ + +ptr_t GC_approx_sp(); + +GC_bool GC_should_collect(); + +void GC_apply_to_all_blocks(/*fn, client_data*/); + /* Invoke fn(hbp, client_data) for each */ + /* allocated heap block. */ +struct hblk * GC_next_used_block(/* struct hblk * h */); + /* Return first in-use block >= h */ +struct hblk * GC_prev_block(/* struct hblk * h */); + /* Return last block <= h. Returned block */ + /* is managed by GC, but may or may not be in */ + /* use. */ +void GC_mark_init(); +void GC_clear_marks(); /* Clear mark bits for all heap objects. */ +void GC_invalidate_mark_state(); /* Tell the marker that marked */ + /* objects may point to unmarked */ + /* ones, and roots may point to */ + /* unmarked objects. */ + /* Reset mark stack. */ +void GC_mark_from_mark_stack(); /* Mark from everything on the mark stack. */ + /* Return after about one pages worth of */ + /* work. */ +GC_bool GC_mark_stack_empty(); +GC_bool GC_mark_some(/* cold_gc_frame */); + /* Perform about one pages worth of marking */ + /* work of whatever kind is needed. Returns */ + /* quickly if no collection is in progress. */ + /* Return TRUE if mark phase finished. */ +void GC_initiate_gc(); /* initiate collection. */ + /* If the mark state is invalid, this */ + /* becomes full colleection. Otherwise */ + /* it's partial. */ +void GC_push_all(/*b,t*/); /* Push everything in a range */ + /* onto mark stack. */ +void GC_push_dirty(/*b,t*/); /* Push all possibly changed */ + /* subintervals of [b,t) onto */ + /* mark stack. */ +#ifndef SMALL_CONFIG + void GC_push_conditional(/* ptr_t b, ptr_t t, GC_bool all*/); +#else +# define GC_push_conditional(b, t, all) GC_push_all(b, t) +#endif + /* Do either of the above, depending */ + /* on the third arg. */ +void GC_push_all_stack(/*b,t*/); /* As above, but consider */ + /* interior pointers as valid */ +void GC_push_all_eager(/*b,t*/); /* Same as GC_push_all_stack, but */ + /* ensures that stack is scanned */ + /* immediately, not just scheduled */ + /* for scanning. */ +#ifndef THREADS + void GC_push_all_stack_partially_eager(/* bottom, top, cold_gc_frame */); + /* Similar to GC_push_all_eager, but only the */ + /* part hotter than cold_gc_frame is scanned */ + /* immediately. Needed to endure that callee- */ + /* save registers are not missed. */ +#else + /* In the threads case, we push part of the current thread stack */ + /* with GC_push_all_eager when we push the registers. This gets the */ + /* callee-save registers that may disappear. The remainder of the */ + /* stacks are scheduled for scanning in *GC_push_other_roots, which */ + /* is thread-package-specific. */ +#endif +void GC_push_current_stack(/* ptr_t cold_gc_frame */); + /* Push enough of the current stack eagerly to */ + /* ensure that callee-save registers saved in */ + /* GC frames are scanned. */ + /* In the non-threads case, schedule entire */ + /* stack for scanning. */ +void GC_push_roots(/* GC_bool all, ptr_t cold_gc_frame */); + /* Push all or dirty roots. */ +extern void (*GC_push_other_roots)(); + /* Push system or application specific roots */ + /* onto the mark stack. In some environments */ + /* (e.g. threads environments) this is */ + /* predfined to be non-zero. A client supplied */ + /* replacement should also call the original */ + /* function. */ +extern void (*GC_start_call_back)(/* void */); + /* Called at start of full collections. */ + /* Not called if 0. Called with allocation */ + /* lock held. */ + /* 0 by default. */ +void GC_push_regs(); /* Push register contents onto mark stack. */ + /* If NURSERY is defined, the default push */ + /* action can be overridden with GC_push_proc */ +void GC_remark(); /* Mark from all marked objects. Used */ + /* only if we had to drop something. */ + +# ifdef NURSERY + extern void (*GC_push_proc)(ptr_t); +# endif +# if defined(MSWIN32) + void __cdecl GC_push_one(); +# else + void GC_push_one(/*p*/); /* If p points to an object, mark it */ + /* and push contents on the mark stack */ +# endif +void GC_push_one_checked(/*p*/); /* Ditto, omits plausibility test */ +void GC_push_marked(/* struct hblk h, hdr * hhdr */); + /* Push contents of all marked objects in h onto */ + /* mark stack. */ +#ifdef SMALL_CONFIG +# define GC_push_next_marked_dirty(h) GC_push_next_marked(h) +#else + struct hblk * GC_push_next_marked_dirty(/* h */); + /* Invoke GC_push_marked on next dirty block above h. */ + /* Return a pointer just past the end of this block. */ +#endif /* !SMALL_CONFIG */ +struct hblk * GC_push_next_marked(/* h */); + /* Ditto, but also mark from clean pages. */ +struct hblk * GC_push_next_marked_uncollectable(/* h */); + /* Ditto, but mark only from uncollectable pages. */ +GC_bool GC_stopped_mark(); /* Stop world and mark from all roots */ + /* and rescuers. */ +void GC_clear_hdr_marks(/* hhdr */); /* Clear the mark bits in a header */ +void GC_set_hdr_marks(/* hhdr */); /* Set the mark bits in a header */ +void GC_add_roots_inner(); +GC_bool GC_is_static_root(/* ptr_t p */); + /* Is the address p in one of the registered static */ + /* root sections? */ +void GC_register_dynamic_libraries(); + /* Add dynamic library data sections to the root set. */ + +/* Machine dependent startup routines */ +ptr_t GC_get_stack_base(); +void GC_register_data_segments(); + +/* Black listing: */ +void GC_bl_init(); +# ifndef ALL_INTERIOR_POINTERS + void GC_add_to_black_list_normal(/* bits, maybe source */); + /* Register bits as a possible future false */ + /* reference from the heap or static data */ +# ifdef PRINT_BLACK_LIST +# define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \ + GC_add_to_black_list_normal(bits, source) +# else +# define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \ + GC_add_to_black_list_normal(bits) +# endif +# else +# ifdef PRINT_BLACK_LIST +# define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \ + GC_add_to_black_list_stack(bits, source) +# else +# define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \ + GC_add_to_black_list_stack(bits) +# endif +# endif + +void GC_add_to_black_list_stack(/* bits, maybe source */); +struct hblk * GC_is_black_listed(/* h, len */); + /* If there are likely to be false references */ + /* to a block starting at h of the indicated */ + /* length, then return the next plausible */ + /* starting location for h that might avoid */ + /* these false references. */ +void GC_promote_black_lists(); + /* Declare an end to a black listing phase. */ +void GC_unpromote_black_lists(); + /* Approximately undo the effect of the above. */ + /* This actually loses some information, but */ + /* only in a reasonably safe way. */ +word GC_number_stack_black_listed(/*struct hblk *start, struct hblk *endp1 */); + /* Return the number of (stack) blacklisted */ + /* blocks in the range for statistical */ + /* purposes. */ + +ptr_t GC_scratch_alloc(/*bytes*/); + /* GC internal memory allocation for */ + /* small objects. Deallocation is not */ + /* possible. */ + +/* Heap block layout maps: */ +void GC_invalidate_map(/* hdr */); + /* Remove the object map associated */ + /* with the block. This identifies */ + /* the block as invalid to the mark */ + /* routines. */ +GC_bool GC_add_map_entry(/*sz*/); + /* Add a heap block map for objects of */ + /* size sz to obj_map. */ + /* Return FALSE on failure. */ +void GC_register_displacement_inner(/*offset*/); + /* Version of GC_register_displacement */ + /* that assumes lock is already held */ + /* and signals are already disabled. */ + +/* hblk allocation: */ +void GC_new_hblk(/*size_in_words, kind*/); + /* Allocate a new heap block, and build */ + /* a free list in it. */ +struct hblk * GC_allochblk(/*size_in_words, kind*/); + /* Allocate a heap block, clear it if */ + /* for composite objects, inform */ + /* the marker that block is valid */ + /* for objects of indicated size. */ + /* sz < 0 ==> atomic. */ +void GC_freehblk(); /* Deallocate a heap block and mark it */ + /* as invalid. */ + +/* Misc GC: */ +void GC_init_inner(); +GC_bool GC_expand_hp_inner(); +void GC_start_reclaim(/*abort_if_found*/); + /* Restore unmarked objects to free */ + /* lists, or (if abort_if_found is */ + /* TRUE) report them. */ + /* Sweeping of small object pages is */ + /* largely deferred. */ +void GC_continue_reclaim(/*size, kind*/); + /* Sweep pages of the given size and */ + /* kind, as long as possible, and */ + /* as long as the corr. free list is */ + /* empty. */ +void GC_reclaim_or_delete_all(); + /* Arrange for all reclaim lists to be */ + /* empty. Judiciously choose between */ + /* sweeping and discarding each page. */ +GC_bool GC_reclaim_all(/* GC_stop_func f*/); + /* Reclaim all blocks. Abort (in a */ + /* consistent state) if f returns TRUE. */ +GC_bool GC_block_empty(/* hhdr */); /* Block completely unmarked? */ +GC_bool GC_never_stop_func(); /* Returns FALSE. */ +GC_bool GC_try_to_collect_inner(/* GC_stop_func f */); + /* Collect; caller must have acquired */ + /* lock and disabled signals. */ + /* Collection is aborted if f returns */ + /* TRUE. Returns TRUE if it completes */ + /* successfully. */ +# define GC_gcollect_inner() \ + (void) GC_try_to_collect_inner(GC_never_stop_func) +void GC_finish_collection(); /* Finish collection. Mark bits are */ + /* consistent and lock is still held. */ +GC_bool GC_collect_or_expand(/* needed_blocks */); + /* Collect or expand heap in an attempt */ + /* make the indicated number of free */ + /* blocks available. Should be called */ + /* until the blocks are available or */ + /* until it fails by returning FALSE. */ +GC_API void GC_init(); /* Initialize collector. */ +void GC_collect_a_little_inner(/* int n */); + /* Do n units worth of garbage */ + /* collection work, if appropriate. */ + /* A unit is an amount appropriate for */ + /* HBLKSIZE bytes of allocation. */ +ptr_t GC_generic_malloc(/* bytes, kind */); + /* Allocate an object of the given */ + /* kind. By default, there are only */ + /* a few kinds: composite(pointerfree), */ + /* atomic, uncollectable, etc. */ + /* We claim it's possible for clever */ + /* client code that understands GC */ + /* internals to add more, e.g. to */ + /* communicate object layout info */ + /* to the collector. */ +ptr_t GC_generic_malloc_ignore_off_page(/* bytes, kind */); + /* As above, but pointers past the */ + /* first page of the resulting object */ + /* are ignored. */ +ptr_t GC_generic_malloc_inner(/* bytes, kind */); + /* Ditto, but I already hold lock, etc. */ +ptr_t GC_generic_malloc_words_small GC_PROTO((size_t words, int kind)); + /* As above, but size in units of words */ + /* Bypasses MERGE_SIZES. Assumes */ + /* words <= MAXOBJSZ. */ +ptr_t GC_generic_malloc_inner_ignore_off_page(/* bytes, kind */); + /* Allocate an object, where */ + /* the client guarantees that there */ + /* will always be a pointer to the */ + /* beginning of the object while the */ + /* object is live. */ +ptr_t GC_allocobj(/* sz_inn_words, kind */); + /* Make the indicated */ + /* free list nonempty, and return its */ + /* head. */ + +void GC_init_headers(); +struct hblkhdr * GC_install_header(/*h*/); + /* Install a header for block h. */ + /* Return 0 on failure, or the header */ + /* otherwise. */ +GC_bool GC_install_counts(/*h, sz*/); + /* Set up forwarding counts for block */ + /* h of size sz. */ + /* Return FALSE on failure. */ +void GC_remove_header(/*h*/); + /* Remove the header for block h. */ +void GC_remove_counts(/*h, sz*/); + /* Remove forwarding counts for h. */ +hdr * GC_find_header(/*p*/); /* Debugging only. */ + +void GC_finalize(); /* Perform all indicated finalization actions */ + /* on unmarked objects. */ + /* Unreachable finalizable objects are enqueued */ + /* for processing by GC_invoke_finalizers. */ + /* Invoked with lock. */ + +void GC_add_to_heap(/*p, bytes*/); + /* Add a HBLKSIZE aligned chunk to the heap. */ + +void GC_print_obj(/* ptr_t p */); + /* P points to somewhere inside an object with */ + /* debugging info. Print a human readable */ + /* description of the object to stderr. */ +extern void (*GC_check_heap)(); + /* Check that all objects in the heap with */ + /* debugging info are intact. Print */ + /* descriptions of any that are not. */ +extern void (*GC_print_heap_obj)(/* ptr_t p */); + /* If possible print s followed by a more */ + /* detailed description of the object */ + /* referred to by p. */ + +/* Memory unmapping: */ +#ifdef USE_MUNMAP + void GC_unmap_old(void); + void GC_merge_unmapped(void); + void GC_unmap(ptr_t start, word bytes); + void GC_remap(ptr_t start, word bytes); + void GC_unmap_gap(ptr_t start1, word bytes1, ptr_t start2, word bytes2); +#endif + +/* Virtual dirty bit implementation: */ +/* Each implementation exports the following: */ +void GC_read_dirty(); /* Retrieve dirty bits. */ +GC_bool GC_page_was_dirty(/* struct hblk * h */); + /* Read retrieved dirty bits. */ +GC_bool GC_page_was_ever_dirty(/* struct hblk * h */); + /* Could the page contain valid heap pointers? */ +void GC_is_fresh(/* struct hblk * h, word number_of_blocks */); + /* Assert the region currently contains no */ + /* valid pointers. */ +void GC_write_hint(/* struct hblk * h */); + /* h is about to be written. */ +void GC_dirty_init(); + +/* Slow/general mark bit manipulation: */ +GC_API GC_bool GC_is_marked(); +void GC_clear_mark_bit(); +void GC_set_mark_bit(); + +/* Stubborn objects: */ +void GC_read_changed(); /* Analogous to GC_read_dirty */ +GC_bool GC_page_was_changed(/* h */); /* Analogous to GC_page_was_dirty */ +void GC_clean_changing_list(); /* Collect obsolete changing list entries */ +void GC_stubborn_init(); + +/* Debugging print routines: */ +void GC_print_block_list(); +void GC_print_hblkfreelist(); +void GC_print_heap_sects(); +void GC_print_static_roots(); +void GC_dump(); + +#ifdef KEEP_BACK_PTRS + void GC_store_back_pointer(ptr_t source, ptr_t dest); + void GC_marked_for_finalization(ptr_t dest); +# define GC_STORE_BACK_PTR(source, dest) GC_store_back_pointer(source, dest) +# define GC_MARKED_FOR_FINALIZATION(dest) GC_marked_for_finalization(dest) +#else +# define GC_STORE_BACK_PTR(source, dest) +# define GC_MARKED_FOR_FINALIZATION(dest) +#endif + +/* Make arguments appear live to compiler */ +# ifdef __WATCOMC__ + void GC_noop(void*, ...); +# else + GC_API void GC_noop(); +# endif + +void GC_noop1(/* word arg */); + +/* Logging and diagnostic output: */ +GC_API void GC_printf GC_PROTO((char * format, long, long, long, long, long, long)); + /* A version of printf that doesn't allocate, */ + /* is restricted to long arguments, and */ + /* (unfortunately) doesn't use varargs for */ + /* portability. Restricted to 6 args and */ + /* 1K total output length. */ + /* (We use sprintf. Hopefully that doesn't */ + /* allocate for long arguments.) */ +# define GC_printf0(f) GC_printf(f, 0l, 0l, 0l, 0l, 0l, 0l) +# define GC_printf1(f,a) GC_printf(f, (long)a, 0l, 0l, 0l, 0l, 0l) +# define GC_printf2(f,a,b) GC_printf(f, (long)a, (long)b, 0l, 0l, 0l, 0l) +# define GC_printf3(f,a,b,c) GC_printf(f, (long)a, (long)b, (long)c, 0l, 0l, 0l) +# define GC_printf4(f,a,b,c,d) GC_printf(f, (long)a, (long)b, (long)c, \ + (long)d, 0l, 0l) +# define GC_printf5(f,a,b,c,d,e) GC_printf(f, (long)a, (long)b, (long)c, \ + (long)d, (long)e, 0l) +# define GC_printf6(f,a,b,c,d,e,g) GC_printf(f, (long)a, (long)b, (long)c, \ + (long)d, (long)e, (long)g) + +void GC_err_printf(/* format, a, b, c, d, e, f */); +# define GC_err_printf0(f) GC_err_puts(f) +# define GC_err_printf1(f,a) GC_err_printf(f, (long)a, 0l, 0l, 0l, 0l, 0l) +# define GC_err_printf2(f,a,b) GC_err_printf(f, (long)a, (long)b, 0l, 0l, 0l, 0l) +# define GC_err_printf3(f,a,b,c) GC_err_printf(f, (long)a, (long)b, (long)c, \ + 0l, 0l, 0l) +# define GC_err_printf4(f,a,b,c,d) GC_err_printf(f, (long)a, (long)b, \ + (long)c, (long)d, 0l, 0l) +# define GC_err_printf5(f,a,b,c,d,e) GC_err_printf(f, (long)a, (long)b, \ + (long)c, (long)d, \ + (long)e, 0l) +# define GC_err_printf6(f,a,b,c,d,e,g) GC_err_printf(f, (long)a, (long)b, \ + (long)c, (long)d, \ + (long)e, (long)g) + /* Ditto, writes to stderr. */ + +void GC_err_puts(/* char *s */); + /* Write s to stderr, don't buffer, don't add */ + /* newlines, don't ... */ + + +# ifdef GC_ASSERTIONS +# define GC_ASSERT(expr) if(!(expr)) {\ + GC_err_printf2("Assertion failure: %s:%ld\n", \ + __FILE__, (unsigned long)__LINE__); \ + ABORT("assertion failure"); } +# else +# define GC_ASSERT(expr) +# endif + +# endif /* GC_PRIVATE_H */ diff --git a/boehm-gc/gc_private.h b/boehm-gc/gc_private.h new file mode 100644 index 00000000000..3dd7c8553bb --- /dev/null +++ b/boehm-gc/gc_private.h @@ -0,0 +1 @@ +# include "gc_priv.h" diff --git a/boehm-gc/gc_typed.h b/boehm-gc/gc_typed.h new file mode 100644 index 00000000000..2e0598f204c --- /dev/null +++ b/boehm-gc/gc_typed.h @@ -0,0 +1,93 @@ +/* + * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers + * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved. + * Copyright 1996 Silicon Graphics. All rights reserved. + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + */ +/* + * Some simple primitives for allocation with explicit type information. + * Facilities for dynamic type inference may be added later. + * Should be used only for extremely performance critical applications, + * or if conservative collector leakage is otherwise a problem (unlikely). + * Note that this is implemented completely separately from the rest + * of the collector, and is not linked in unless referenced. + * This does not currently support GC_DEBUG in any interesting way. + */ +/* Boehm, May 19, 1994 2:13 pm PDT */ + +#ifndef _GC_TYPED_H +# define _GC_TYPED_H +# ifndef _GC_H +# include "gc.h" +# endif + +typedef GC_word * GC_bitmap; + /* The least significant bit of the first word is one if */ + /* the first word in the object may be a pointer. */ + +# define GC_get_bit(bm, index) \ + (((bm)[divWORDSZ(index)] >> modWORDSZ(index)) & 1) +# define GC_set_bit(bm, index) \ + (bm)[divWORDSZ(index)] |= (word)1 << modWORDSZ(index) + +typedef GC_word GC_descr; + +GC_API GC_descr GC_make_descriptor GC_PROTO((GC_bitmap bm, size_t len)); + /* Return a type descriptor for the object whose layout */ + /* is described by the argument. */ + /* The least significant bit of the first word is one */ + /* if the first word in the object may be a pointer. */ + /* The second argument specifies the number of */ + /* meaningful bits in the bitmap. The actual object */ + /* may be larger (but not smaller). Any additional */ + /* words in the object are assumed not to contain */ + /* pointers. */ + /* Returns a conservative approximation in the */ + /* (unlikely) case of insufficient memory to build */ + /* the descriptor. Calls to GC_make_descriptor */ + /* may consume some amount of a finite resource. This */ + /* is intended to be called once per type, not once */ + /* per allocation. */ + +GC_API GC_PTR GC_malloc_explicitly_typed + GC_PROTO((size_t size_in_bytes, GC_descr d)); + /* Allocate an object whose layout is described by d. */ + /* The resulting object MAY NOT BE PASSED TO REALLOC. */ + /* The returned object is cleared. */ + +GC_API GC_PTR GC_malloc_explicitly_typed_ignore_off_page + GC_PROTO((size_t size_in_bytes, GC_descr d)); + +GC_API GC_PTR GC_calloc_explicitly_typed + GC_PROTO((size_t nelements, + size_t element_size_in_bytes, + GC_descr d)); + /* Allocate an array of nelements elements, each of the */ + /* given size, and with the given descriptor. */ + /* The elemnt size must be a multiple of the byte */ + /* alignment required for pointers. E.g. on a 32-bit */ + /* machine with 16-bit aligned pointers, size_in_bytes */ + /* must be a multiple of 2. */ + /* Returned object is cleared. */ + +#ifdef GC_DEBUG +# define GC_MALLOC_EXPLICTLY_TYPED(bytes, d) GC_MALLOC(bytes) +# define GC_CALLOC_EXPLICTLY_TYPED(n, bytes, d) GC_MALLOC(n*bytes) +#else +# define GC_MALLOC_EXPLICTLY_TYPED(bytes, d) \ + GC_malloc_explicitly_typed(bytes, d) +# define GC_CALLOC_EXPLICTLY_TYPED(n, bytes, d) \ + GC_calloc_explicitly_typed(n, bytes, d) +#endif /* !GC_DEBUG */ + + +#endif /* _GC_TYPED_H */ + diff --git a/boehm-gc/gcconfig.h b/boehm-gc/gcconfig.h new file mode 100644 index 00000000000..4c4bca31222 --- /dev/null +++ b/boehm-gc/gcconfig.h @@ -0,0 +1,1318 @@ +/* + * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers + * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved. + * Copyright (c) 1996 by Silicon Graphics. All rights reserved. + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + */ + +#ifndef GCCONFIG_H + +# define GCCONFIG_H + +/* Machine dependent parameters. Some tuning parameters can be found */ +/* near the top of gc_private.h. */ + +/* Machine specific parts contributed by various people. See README file. */ + +/* First a unified test for Linux: */ +# if defined(linux) || defined(__linux__) +# define LINUX +# endif + +/* Determine the machine type: */ +# if defined(sun) && defined(mc68000) +# define M68K +# define SUNOS4 +# define mach_type_known +# endif +# if defined(hp9000s300) +# define M68K +# define HP +# define mach_type_known +# endif +# if defined(__OpenBSD__) && defined(m68k) +# define M68K +# define OPENBSD +# define mach_type_known +# endif +# if defined(__OpenBSD__) && defined(__sparc__) +# define SPARC +# define OPENBSD +# define mach_type_known +# endif +# if defined(__NetBSD__) && defined(m68k) +# define M68K +# define NETBSD +# define mach_type_known +# endif +# if defined(__NetBSD__) && defined(arm32) +# define ARM32 +# define NETBSD +# define mach_type_known +# endif +# if defined(vax) +# define VAX +# ifdef ultrix +# define ULTRIX +# else +# define BSD +# endif +# define mach_type_known +# endif +# if defined(mips) || defined(__mips) +# define MIPS +# if !defined(LINUX) +# if defined(ultrix) || defined(__ultrix) || defined(__NetBSD__) +# define ULTRIX +# else +# if defined(_SYSTYPE_SVR4) || defined(SYSTYPE_SVR4) \ + || defined(__SYSTYPE_SVR4__) +# define IRIX5 /* or IRIX 6.X */ +# else +# define RISCOS /* or IRIX 4.X */ +# endif +# endif +# endif /* !LINUX */ +# define mach_type_known +# endif +# if defined(sequent) && defined(i386) +# define I386 +# define SEQUENT +# define mach_type_known +# endif +# if defined(sun) && defined(i386) +# define I386 +# define SUNOS5 +# define mach_type_known +# endif +# if (defined(__OS2__) || defined(__EMX__)) && defined(__32BIT__) +# define I386 +# define OS2 +# define mach_type_known +# endif +# if defined(ibm032) +# define RT +# define mach_type_known +# endif +# if defined(sun) && (defined(sparc) || defined(__sparc)) +# define SPARC + /* Test for SunOS 5.x */ +# include <errno.h> +# ifdef ECHRNG +# define SUNOS5 +# else +# define SUNOS4 +# endif +# define mach_type_known +# endif +# if defined(sparc) && defined(unix) && !defined(sun) && !defined(linux) \ + && !defined(__OpenBSD__) +# define SPARC +# define DRSNX +# define mach_type_known +# endif +# if defined(_IBMR2) +# define RS6000 +# define mach_type_known +# endif +# if defined(_M_XENIX) && defined(_M_SYSV) && defined(_M_I386) + /* The above test may need refinement */ +# define I386 +# if defined(_SCO_ELF) +# define SCO_ELF +# else +# define SCO +# endif +# define mach_type_known +# endif +# if defined(_AUX_SOURCE) +# define M68K +# define SYSV +# define mach_type_known +# endif +# if defined(_PA_RISC1_0) || defined(_PA_RISC1_1) || defined(_PA_RISC2_0) \ + || defined(hppa) || defined(__hppa__) +# define HP_PA +# ifndef LINUX +# define HPUX +# endif +# define mach_type_known +# endif +# if defined(LINUX) && (defined(i386) || defined(__i386__)) +# define I386 +# define mach_type_known +# endif +# if defined(LINUX) && (defined(__ia64__) || defined(__ia64)) +# define IA64 +# define mach_type_known +# endif +# if defined(LINUX) && defined(powerpc) +# define POWERPC +# define mach_type_known +# endif +# if defined(LINUX) && defined(__mc68000__) +# define M68K +# define mach_type_known +# endif +# if defined(LINUX) && (defined(sparc) || defined(__sparc__)) +# define SPARC +# define mach_type_known +# endif +# if defined(LINUX) && defined(arm) +# define ARM32 +# define mach_type_known +# endif +# if defined(__alpha) || defined(__alpha__) +# define ALPHA +# if !defined(LINUX) +# define OSF1 /* a.k.a Digital Unix */ +# endif +# define mach_type_known +# endif +# if defined(_AMIGA) && !defined(AMIGA) +# define AMIGA +# endif +# ifdef AMIGA +# define M68K +# define mach_type_known +# endif +# if defined(THINK_C) || defined(__MWERKS__) && !defined(__powerc) +# define M68K +# define MACOS +# define mach_type_known +# endif +# if defined(__MWERKS__) && defined(__powerc) +# define POWERPC +# define MACOS +# define mach_type_known +# endif +# if defined(macosx) +# define MACOSX +# define POWERPC +# define mach_type_known +# endif +# if defined(NeXT) && defined(mc68000) +# define M68K +# define NEXT +# define mach_type_known +# endif +# if defined(NeXT) && defined(i386) +# define I386 +# define NEXT +# define mach_type_known +# endif +# if defined(__OpenBSD__) && defined(i386) +# define I386 +# define OPENBSD +# define mach_type_known +# endif +# if defined(__FreeBSD__) && defined(i386) +# define I386 +# define FREEBSD +# define mach_type_known +# endif +# if defined(__NetBSD__) && defined(i386) +# define I386 +# define NETBSD +# define mach_type_known +# endif +# if defined(bsdi) && defined(i386) +# define I386 +# define BSDI +# define mach_type_known +# endif +# if !defined(mach_type_known) && defined(__386BSD__) +# define I386 +# define THREE86BSD +# define mach_type_known +# endif +# if defined(_CX_UX) && defined(_M88K) +# define M88K +# define CX_UX +# define mach_type_known +# endif +# if defined(DGUX) +# define M88K + /* DGUX defined */ +# define mach_type_known +# endif +# if (defined(_MSDOS) || defined(_MSC_VER)) && (_M_IX86 >= 300) \ + || defined(_WIN32) && !defined(__CYGWIN32__) && !defined(__CYGWIN__) +# define I386 +# define MSWIN32 /* or Win32s */ +# define mach_type_known +# endif +# if defined(__DJGPP__) +# define I386 +# ifndef DJGPP +# define DJGPP /* MSDOS running the DJGPP port of GCC */ +# endif +# define mach_type_known +# endif +# if defined(__CYGWIN32__) || defined(__CYGWIN__) +# define I386 +# define CYGWIN32 +# define mach_type_known +# endif +# if defined(__MINGW32__) +# define I386 +# define MSWIN32 +# define mach_type_known +# endif +# if defined(__BORLANDC__) +# define I386 +# define MSWIN32 +# define mach_type_known +# endif +# if defined(_UTS) && !defined(mach_type_known) +# define S370 +# define UTS4 +# define mach_type_known +# endif +# if defined(__pj__) +# define PJ +# define mach_type_known +# endif +/* Ivan Demakov */ +# if defined(__WATCOMC__) && defined(__386__) +# define I386 +# if !defined(OS2) && !defined(MSWIN32) && !defined(DOS4GW) +# if defined(__OS2__) +# define OS2 +# else +# if defined(__WINDOWS_386__) || defined(__NT__) +# define MSWIN32 +# else +# define DOS4GW +# endif +# endif +# endif +# define mach_type_known +# endif + +/* Feel free to add more clauses here */ + +/* Or manually define the machine type here. A machine type is */ +/* characterized by the architecture. Some */ +/* machine types are further subdivided by OS. */ +/* the macros ULTRIX, RISCOS, and BSD to distinguish. */ +/* Note that SGI IRIX is treated identically to RISCOS. */ +/* SYSV on an M68K actually means A/UX. */ +/* The distinction in these cases is usually the stack starting address */ +# ifndef mach_type_known + --> unknown machine type +# endif + /* Mapping is: M68K ==> Motorola 680X0 */ + /* (SUNOS4,HP,NEXT, and SYSV (A/UX), */ + /* MACOS and AMIGA variants) */ + /* I386 ==> Intel 386 */ + /* (SEQUENT, OS2, SCO, LINUX, NETBSD, */ + /* FREEBSD, THREE86BSD, MSWIN32, */ + /* BSDI,SUNOS5, NEXT, other variants) */ + /* NS32K ==> Encore Multimax */ + /* MIPS ==> R2000 or R3000 */ + /* (RISCOS, ULTRIX variants) */ + /* VAX ==> DEC VAX */ + /* (BSD, ULTRIX variants) */ + /* RS6000 ==> IBM RS/6000 AIX3.X */ + /* RT ==> IBM PC/RT */ + /* HP_PA ==> HP9000/700 & /800 */ + /* HP/UX */ + /* SPARC ==> SPARC under SunOS */ + /* (SUNOS4, SUNOS5, */ + /* DRSNX variants) */ + /* ALPHA ==> DEC Alpha */ + /* (OSF1 and LINUX variants) */ + /* M88K ==> Motorola 88XX0 */ + /* (CX_UX and DGUX) */ + /* S370 ==> 370-like machine */ + /* running Amdahl UTS4 */ + /* ARM32 ==> Intel StrongARM */ + /* IA64 ==> Intel IA64 */ + /* (e.g. Itanium) */ + + +/* + * For each architecture and OS, the following need to be defined: + * + * CPP_WORD_SZ is a simple integer constant representing the word size. + * in bits. We assume byte addressibility, where a byte has 8 bits. + * We also assume CPP_WORD_SZ is either 32 or 64. + * (We care about the length of pointers, not hardware + * bus widths. Thus a 64 bit processor with a C compiler that uses + * 32 bit pointers should use CPP_WORD_SZ of 32, not 64. Default is 32.) + * + * MACH_TYPE is a string representation of the machine type. + * OS_TYPE is analogous for the OS. + * + * ALIGNMENT is the largest N, such that + * all pointer are guaranteed to be aligned on N byte boundaries. + * defining it to be 1 will always work, but perform poorly. + * + * DATASTART is the beginning of the data segment. + * On UNIX systems, the collector will scan the area between DATASTART + * and DATAEND for root pointers. + * + * DATAEND, if not &end. + * + * ALIGN_DOUBLE of GC_malloc should return blocks aligned to twice + * the pointer size. + * + * STACKBOTTOM is the cool end of the stack, which is usually the + * highest address in the stack. + * Under PCR or OS/2, we have other ways of finding thread stacks. + * For each machine, the following should: + * 1) define STACK_GROWS_UP if the stack grows toward higher addresses, and + * 2) define exactly one of + * STACKBOTTOM (should be defined to be an expression) + * HEURISTIC1 + * HEURISTIC2 + * If either of the last two macros are defined, then STACKBOTTOM is computed + * during collector startup using one of the following two heuristics: + * HEURISTIC1: Take an address inside GC_init's frame, and round it up to + * the next multiple of STACK_GRAN. + * HEURISTIC2: Take an address inside GC_init's frame, increment it repeatedly + * in small steps (decrement if STACK_GROWS_UP), and read the value + * at each location. Remember the value when the first + * Segmentation violation or Bus error is signalled. Round that + * to the nearest plausible page boundary, and use that instead + * of STACKBOTTOM. + * + * If no expression for STACKBOTTOM can be found, and neither of the above + * heuristics are usable, the collector can still be used with all of the above + * undefined, provided one of the following is done: + * 1) GC_mark_roots can be changed to somehow mark from the correct stack(s) + * without reference to STACKBOTTOM. This is appropriate for use in + * conjunction with thread packages, since there will be multiple stacks. + * (Allocating thread stacks in the heap, and treating them as ordinary + * heap data objects is also possible as a last resort. However, this is + * likely to introduce significant amounts of excess storage retention + * unless the dead parts of the thread stacks are periodically cleared.) + * 2) Client code may set GC_stackbottom before calling any GC_ routines. + * If the author of the client code controls the main program, this is + * easily accomplished by introducing a new main program, setting + * GC_stackbottom to the address of a local variable, and then calling + * the original main program. The new main program would read something + * like: + * + * # include "gc_private.h" + * + * main(argc, argv, envp) + * int argc; + * char **argv, **envp; + * { + * int dummy; + * + * GC_stackbottom = (ptr_t)(&dummy); + * return(real_main(argc, argv, envp)); + * } + * + * + * Each architecture may also define the style of virtual dirty bit + * implementation to be used: + * MPROTECT_VDB: Write protect the heap and catch faults. + * PROC_VDB: Use the SVR4 /proc primitives to read dirty bits. + * + * An architecture may define DYNAMIC_LOADING if dynamic_load.c + * defined GC_register_dynamic_libraries() for the architecture. + * + * An architecture may define PREFETCH(x) to preload the cache with *x. + * This defaults to a no-op. + * + * PREFETCH_FOR_WRITE(x) is used if *x is about to be written. + * + * An architecture may also define CLEAR_DOUBLE(x) to be a fast way to + * clear the two words at GC_malloc-aligned address x. By default, + * word stores of 0 are used instead. + */ + + +# define STACK_GRAN 0x1000000 +# ifdef M68K +# define MACH_TYPE "M68K" +# define ALIGNMENT 2 +# ifdef OPENBSD +# define OS_TYPE "OPENBSD" +# define HEURISTIC2 + extern char etext; +# define DATASTART ((ptr_t)(&etext)) +# endif +# ifdef NETBSD +# define OS_TYPE "NETBSD" +# define HEURISTIC2 + extern char etext; +# define DATASTART ((ptr_t)(&etext)) +# endif +# ifdef LINUX +# define OS_TYPE "LINUX" +# define STACKBOTTOM ((ptr_t)0xf0000000) +# define MPROTECT_VDB +# ifdef __ELF__ +# define DYNAMIC_LOADING + extern char **__environ; +# define DATASTART ((ptr_t)(&__environ)) + /* hideous kludge: __environ is the first */ + /* word in crt0.o, and delimits the start */ + /* of the data segment, no matter which */ + /* ld options were passed through. */ + /* We could use _etext instead, but that */ + /* would include .rodata, which may */ + /* contain large read-only data tables */ + /* that we'd rather not scan. */ + extern int _end; +# define DATAEND (&_end) +# else + extern int etext; +# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff)) +# endif +# endif +# ifdef SUNOS4 +# define OS_TYPE "SUNOS4" + extern char etext; +# define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ffff) & ~0x1ffff)) +# define HEURISTIC1 /* differs */ +# define DYNAMIC_LOADING +# endif +# ifdef HP +# define OS_TYPE "HP" + extern char etext; +# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff)) +# define STACKBOTTOM ((ptr_t) 0xffeffffc) + /* empirically determined. seems to work. */ +# include <unistd.h> +# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE) +# endif +# ifdef SYSV +# define OS_TYPE "SYSV" + extern etext; +# define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \ + & ~0x3fffff) \ + +((word)&etext & 0x1fff)) + /* This only works for shared-text binaries with magic number 0413. + The other sorts of SysV binaries put the data at the end of the text, + in which case the default of &etext would work. Unfortunately, + handling both would require having the magic-number available. + -- Parag + */ +# define STACKBOTTOM ((ptr_t)0xFFFFFFFE) + /* The stack starts at the top of memory, but */ + /* 0x0 cannot be used as setjump_test complains */ + /* that the stack direction is incorrect. Two */ + /* bytes down from 0x0 should be safe enough. */ + /* --Parag */ +# include <sys/mmu.h> +# define GETPAGESIZE() PAGESIZE /* Is this still right? */ +# endif +# ifdef AMIGA +# define OS_TYPE "AMIGA" + /* STACKBOTTOM and DATASTART handled specially */ + /* in os_dep.c */ +# define DATAEND /* not needed */ +# define GETPAGESIZE() 4096 +# endif +# ifdef MACOS +# ifndef __LOWMEM__ +# include <LowMem.h> +# endif +# define OS_TYPE "MACOS" + /* see os_dep.c for details of global data segments. */ +# define STACKBOTTOM ((ptr_t) LMGetCurStackBase()) +# define DATAEND /* not needed */ +# define GETPAGESIZE() 4096 +# endif +# ifdef NEXT +# define OS_TYPE "NEXT" +# define DATASTART ((ptr_t) get_etext()) +# define STACKBOTTOM ((ptr_t) 0x4000000) +# define DATAEND /* not needed */ +# endif +# endif + +# ifdef POWERPC +# define MACH_TYPE "POWERPC" +# ifdef MACOS +# define ALIGNMENT 2 /* Still necessary? Could it be 4? */ +# ifndef __LOWMEM__ +# include <LowMem.h> +# endif +# define OS_TYPE "MACOS" + /* see os_dep.c for details of global data segments. */ +# define STACKBOTTOM ((ptr_t) LMGetCurStackBase()) +# define DATAEND /* not needed */ +# endif +# ifdef LINUX +# define ALIGNMENT 4 /* Guess. Can someone verify? */ + /* This was 2, but that didn't sound right. */ +# define OS_TYPE "LINUX" +# define HEURISTIC1 +# undef STACK_GRAN +# define STACK_GRAN 0x10000000 + /* Stack usually starts at 0x80000000 */ +# define LINUX_DATA_START + extern int _end; +# define DATAEND (&_end) +# endif +# ifdef MACOSX +# define ALIGNMENT 4 +# define OS_TYPE "MACOSX" +# define DATASTART ((ptr_t) get_etext()) +# define STACKBOTTOM ((ptr_t) 0xc0000000) +# define DATAEND /* not needed */ +# endif +# endif + +# ifdef VAX +# define MACH_TYPE "VAX" +# define ALIGNMENT 4 /* Pointers are longword aligned by 4.2 C compiler */ + extern char etext; +# define DATASTART ((ptr_t)(&etext)) +# ifdef BSD +# define OS_TYPE "BSD" +# define HEURISTIC1 + /* HEURISTIC2 may be OK, but it's hard to test. */ +# endif +# ifdef ULTRIX +# define OS_TYPE "ULTRIX" +# define STACKBOTTOM ((ptr_t) 0x7fffc800) +# endif +# endif + +# ifdef RT +# define MACH_TYPE "RT" +# define ALIGNMENT 4 +# define DATASTART ((ptr_t) 0x10000000) +# define STACKBOTTOM ((ptr_t) 0x1fffd800) +# endif + +# ifdef SPARC +# define MACH_TYPE "SPARC" +# define ALIGNMENT 4 /* Required by hardware */ +# define ALIGN_DOUBLE + extern int etext; +# ifdef SUNOS5 +# define OS_TYPE "SUNOS5" + extern int _etext; + extern int _end; + extern char * GC_SysVGetDataStart(); +# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext) +# define DATAEND (&_end) +# ifndef USE_MMAP +# define USE_MMAP +# endif +# ifdef USE_MMAP +# define HEAP_START (ptr_t)0x40000000 +# else +# define HEAP_START DATAEND +# endif +# define PROC_VDB +/* HEURISTIC1 reportedly no longer works under 2.7. Thus we */ +/* switched to HEURISTIC2, eventhough it creates some debugging */ +/* issues. */ +# define HEURISTIC2 +# include <unistd.h> +# define GETPAGESIZE() sysconf(_SC_PAGESIZE) + /* getpagesize() appeared to be missing from at least one */ + /* Solaris 5.4 installation. Weird. */ +# define DYNAMIC_LOADING +# endif +# ifdef SUNOS4 +# define OS_TYPE "SUNOS4" + /* [If you have a weak stomach, don't read this.] */ + /* We would like to use: */ +/* # define DATASTART ((ptr_t)((((word) (&etext)) + 0x1fff) & ~0x1fff)) */ + /* This fails occasionally, due to an ancient, but very */ + /* persistent ld bug. &etext is set 32 bytes too high. */ + /* We instead read the text segment size from the a.out */ + /* header, which happens to be mapped into our address space */ + /* at the start of the text segment. The detective work here */ + /* was done by Robert Ehrlich, Manuel Serrano, and Bernard */ + /* Serpette of INRIA. */ + /* This assumes ZMAGIC, i.e. demand-loadable executables. */ +# define TEXTSTART 0x2000 +# define DATASTART ((ptr_t)(*(int *)(TEXTSTART+0x4)+TEXTSTART)) +# define MPROTECT_VDB +# define HEURISTIC1 +# define DYNAMIC_LOADING +# endif +# ifdef DRSNX +# define CPP_WORDSZ 32 +# define OS_TYPE "DRSNX" + extern char * GC_SysVGetDataStart(); + extern int etext; +# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext) +# define MPROTECT_VDB +# define STACKBOTTOM ((ptr_t) 0xdfff0000) +# define DYNAMIC_LOADING +# endif +# ifdef LINUX +# define OS_TYPE "LINUX" +# ifdef __ELF__ +# define LINUX_DATA_START +# define DYNAMIC_LOADING +# else + Linux Sparc non elf ? +# endif + extern int _end; +# define DATAEND (&_end) +# define SVR4 +# define STACKBOTTOM ((ptr_t) 0xf0000000) +# endif +# ifdef OPENBSD +# define OS_TYPE "OPENBSD" +# define STACKBOTTOM ((ptr_t) 0xf8000000) +# define DATASTART ((ptr_t)(&etext)) +# endif +# endif + +# ifdef I386 +# define MACH_TYPE "I386" +# define ALIGNMENT 4 /* Appears to hold for all "32 bit" compilers */ + /* except Borland. The -a4 option fixes */ + /* Borland. */ + /* Ivan Demakov: For Watcom the option is -zp4. */ +# ifndef SMALL_CONFIG +# define ALIGN_DOUBLE /* Not strictly necessary, but may give speed */ + /* improvement on Pentiums. */ +# endif +# ifdef SEQUENT +# define OS_TYPE "SEQUENT" + extern int etext; +# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff)) +# define STACKBOTTOM ((ptr_t) 0x3ffff000) +# endif +# ifdef SUNOS5 +# define OS_TYPE "SUNOS5" + extern int etext, _start; + extern char * GC_SysVGetDataStart(); +# define DATASTART GC_SysVGetDataStart(0x1000, &etext) +# define STACKBOTTOM ((ptr_t)(&_start)) +/** At least in Solaris 2.5, PROC_VDB gives wrong values for dirty bits. */ +/*# define PROC_VDB*/ +# define DYNAMIC_LOADING +# ifndef USE_MMAP +# define USE_MMAP +# endif +# ifdef USE_MMAP +# define HEAP_START (ptr_t)0x40000000 +# else +# define HEAP_START DATAEND +# endif +# endif +# ifdef SCO +# define OS_TYPE "SCO" + extern int etext; +# define DATASTART ((ptr_t)((((word) (&etext)) + 0x3fffff) \ + & ~0x3fffff) \ + +((word)&etext & 0xfff)) +# define STACKBOTTOM ((ptr_t) 0x7ffffffc) +# endif +# ifdef SCO_ELF +# define OS_TYPE "SCO_ELF" + extern int etext; +# define DATASTART ((ptr_t)(&etext)) +# define STACKBOTTOM ((ptr_t) 0x08048000) +# define DYNAMIC_LOADING +# define ELF_CLASS ELFCLASS32 +# endif +# ifdef LINUX +# define OS_TYPE "LINUX" +# define LINUX_STACKBOTTOM +# if 0 +# define HEURISTIC1 +# undef STACK_GRAN +# define STACK_GRAN 0x10000000 + /* STACKBOTTOM is usually 0xc0000000, but this changes with */ + /* different kernel configurations. In particular, systems */ + /* with 2GB physical memory will usually move the user */ + /* address space limit, and hence initial SP to 0x80000000. */ +# endif +# if !defined(LINUX_THREADS) || !defined(REDIRECT_MALLOC) +# define MPROTECT_VDB +# else + /* We seem to get random errors in incremental mode, */ + /* possibly because Linux threads is itself a malloc client */ + /* and can't deal with the signals. */ +# endif +# ifdef __ELF__ +# define DYNAMIC_LOADING +# ifdef UNDEFINED /* includes ro data */ + extern int _etext; +# define DATASTART ((ptr_t)((((word) (&_etext)) + 0xfff) & ~0xfff)) +# endif +# include <features.h> +# if defined(__GLIBC__) && __GLIBC__ >= 2 +# define LINUX_DATA_START +# else + extern char **__environ; +# define DATASTART ((ptr_t)(&__environ)) + /* hideous kludge: __environ is the first */ + /* word in crt0.o, and delimits the start */ + /* of the data segment, no matter which */ + /* ld options were passed through. */ + /* We could use _etext instead, but that */ + /* would include .rodata, which may */ + /* contain large read-only data tables */ + /* that we'd rather not scan. */ +# endif + extern int _end; +# define DATAEND (&_end) +# else + extern int etext; +# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff)) +# endif +# ifdef USE_I686_PREFETCH +# define PREFETCH(x) \ + __asm__ __volatile__ (" prefetchnta %0": : "m"(*(char *)(x))) + /* Empirically prefetcht0 is much more effective at reducing */ + /* cache miss stalls for the targetted load instructions. But it */ + /* seems to interfere enough with other cache traffic that the net */ + /* result is worse than prefetchnta. */ +# if 0 + /* Using prefetches for write seems to have a slight negative */ + /* impact on performance, at least for a PIII/500. */ +# define PREFETCH_FOR_WRITE(x) \ + __asm__ __volatile__ (" prefetcht0 %0": : "m"(*(char *)(x))) +# endif +# endif +# ifdef USE_3DNOW_PREFETCH +# define PREFETCH(x) \ + __asm__ __volatile__ (" prefetch %0": : "m"(*(char *)(x))) +# define PREFETCH_FOR_WRITE(x) + __asm__ __volatile__ (" prefetchw %0": : "m"(*(char *)(x))) +# endif +# endif +# ifdef CYGWIN32 +# define OS_TYPE "CYGWIN32" + extern int _data_start__; + extern int _data_end__; + extern int _bss_start__; + extern int _bss_end__; + /* For binutils 2.9.1, we have */ + /* DATASTART = _data_start__ */ + /* DATAEND = _bss_end__ */ + /* whereas for some earlier versions it was */ + /* DATASTART = _bss_start__ */ + /* DATAEND = _data_end__ */ + /* To get it right for both, we take the */ + /* minumum/maximum of the two. */ +# define MAX(x,y) ((x) > (y) ? (x) : (y)) +# define MIN(x,y) ((x) < (y) ? (x) : (y)) +# define DATASTART ((ptr_t) MIN(&_data_start__, &_bss_start__)) +# define DATAEND ((ptr_t) MAX(&_data_end__, &_bss_end__)) +# undef STACK_GRAN +# define STACK_GRAN 0x10000 +# define HEURISTIC1 +# endif +# ifdef OS2 +# define OS_TYPE "OS2" + /* STACKBOTTOM and DATASTART are handled specially in */ + /* os_dep.c. OS2 actually has the right */ + /* system call! */ +# define DATAEND /* not needed */ +# endif +# ifdef MSWIN32 +# define OS_TYPE "MSWIN32" + /* STACKBOTTOM and DATASTART are handled specially in */ + /* os_dep.c. */ +# ifndef __WATCOMC__ +# define MPROTECT_VDB +# endif +# define DATAEND /* not needed */ +# endif +# ifdef DJGPP +# define OS_TYPE "DJGPP" +# include "stubinfo.h" + extern int etext; + extern int _stklen; + extern int __djgpp_stack_limit; +# define DATASTART ((ptr_t)((((word) (&etext)) + 0x1ff) & ~0x1ff)) +/* # define STACKBOTTOM ((ptr_t)((word) _stubinfo + _stubinfo->size \ + + _stklen)) */ +# define STACKBOTTOM ((ptr_t)((word) __djgpp_stack_limit + _stklen)) + /* This may not be right. */ +# endif +# ifdef OPENBSD +# define OS_TYPE "OPENBSD" +# endif +# ifdef FREEBSD +# define OS_TYPE "FREEBSD" +# define MPROTECT_VDB +# endif +# ifdef NETBSD +# define OS_TYPE "NETBSD" +# endif +# ifdef THREE86BSD +# define OS_TYPE "THREE86BSD" +# endif +# ifdef BSDI +# define OS_TYPE "BSDI" +# endif +# if defined(OPENBSD) || defined(FREEBSD) || defined(NETBSD) \ + || defined(THREE86BSD) || defined(BSDI) +# define HEURISTIC2 + extern char etext; +# define DATASTART ((ptr_t)(&etext)) +# endif +# ifdef NEXT +# define OS_TYPE "NEXT" +# define DATASTART ((ptr_t) get_etext()) +# define STACKBOTTOM ((ptr_t)0xc0000000) +# define DATAEND /* not needed */ +# endif +# ifdef DOS4GW +# define OS_TYPE "DOS4GW" + extern long __nullarea; + extern char _end; + extern char *_STACKTOP; + /* Depending on calling conventions Watcom C either precedes + or does not precedes with undescore names of C-variables. + Make sure startup code variables always have the same names. */ + #pragma aux __nullarea "*"; + #pragma aux _end "*"; +# define STACKBOTTOM ((ptr_t) _STACKTOP) + /* confused? me too. */ +# define DATASTART ((ptr_t) &__nullarea) +# define DATAEND ((ptr_t) &_end) +# endif +# endif + +# ifdef NS32K +# define MACH_TYPE "NS32K" +# define ALIGNMENT 4 + extern char **environ; +# define DATASTART ((ptr_t)(&environ)) + /* hideous kludge: environ is the first */ + /* word in crt0.o, and delimits the start */ + /* of the data segment, no matter which */ + /* ld options were passed through. */ +# define STACKBOTTOM ((ptr_t) 0xfffff000) /* for Encore */ +# endif + +# ifdef MIPS +# define MACH_TYPE "MIPS" +/* # define STACKBOTTOM ((ptr_t)0x7fff8000) sometimes also works. */ +# ifdef LINUX + /* This was developed for a linuxce style platform. Probably */ + /* needs to be tweaked for workstation class machines. */ +# define OS_TYPE "LINUX" + extern int __data_start; +# define DATASTART ((ptr_t)(&__data_start)) +# define ALIGNMENT 4 +# define USE_GENERIC_PUSH_REGS 1 +# define STACKBOTTOM 0x80000000 + /* In many cases, this should probably use LINUX_STACKBOTTOM */ + /* instead. But some kernel versions seem to give the wrong */ + /* value from /proc. */ +# endif /* Linux */ +# ifdef ULTRIX +# define HEURISTIC2 +# define DATASTART (ptr_t)0x10000000 + /* Could probably be slightly higher since */ + /* startup code allocates lots of stuff. */ +# define OS_TYPE "ULTRIX" +# define ALIGNMENT 4 +# endif +# ifdef RISCOS +# define HEURISTIC2 +# define DATASTART (ptr_t)0x10000000 +# define OS_TYPE "RISCOS" +# define ALIGNMENT 4 /* Required by hardware */ +# endif +# ifdef IRIX5 +# define HEURISTIC2 + extern int _fdata; +# define DATASTART ((ptr_t)(&_fdata)) +# ifdef USE_MMAP +# define HEAP_START (ptr_t)0x30000000 +# else +# define HEAP_START DATASTART +# endif + /* Lowest plausible heap address. */ + /* In the MMAP case, we map there. */ + /* In either case it is used to identify */ + /* heap sections so they're not */ + /* considered as roots. */ +# define OS_TYPE "IRIX5" +# define MPROTECT_VDB +# ifdef _MIPS_SZPTR +# define CPP_WORDSZ _MIPS_SZPTR +# define ALIGNMENT (_MIPS_SZPTR/8) +# if CPP_WORDSZ != 64 +# define ALIGN_DOUBLE +# endif +# else +# define ALIGNMENT 4 +# define ALIGN_DOUBLE +# endif +# define DYNAMIC_LOADING +# endif +# endif + +# ifdef RS6000 +# define MACH_TYPE "RS6000" +# define ALIGNMENT 4 +# define DATASTART ((ptr_t)0x20000000) + extern int errno; +# define STACKBOTTOM ((ptr_t)((ulong)&errno)) +# define DYNAMIC_LOADING + /* For really old versions of AIX, this may have to be removed. */ +# endif + +# ifdef HP_PA + /* OS is assumed to be HP/UX */ +# define MACH_TYPE "HP_PA" +# define OS_TYPE "HPUX" +# ifdef __LP64__ +# define CPP_WORDSZ 64 +# define ALIGNMENT 8 +# else +# define CPP_WORDSZ 32 +# define ALIGNMENT 4 +# define ALIGN_DOUBLE +# endif + extern int __data_start; +# define DATASTART ((ptr_t)(&__data_start)) +# if 0 + /* The following appears to work for 7xx systems running HP/UX */ + /* 9.xx Furthermore, it might result in much faster */ + /* collections than HEURISTIC2, which may involve scanning */ + /* segments that directly precede the stack. It is not the */ + /* default, since it may not work on older machine/OS */ + /* combinations. (Thanks to Raymond X.T. Nijssen for uncovering */ + /* this.) */ +# define STACKBOTTOM ((ptr_t) 0x7b033000) /* from /etc/conf/h/param.h */ +# else +# define HEURISTIC2 +# endif +# define STACK_GROWS_UP +# define DYNAMIC_LOADING +# ifndef HPUX_THREADS +# define MPROTECT_VDB +# endif +# include <unistd.h> +# define GETPAGESIZE() sysconf(_SC_PAGE_SIZE) +# endif + +# ifdef ALPHA +# define MACH_TYPE "ALPHA" +# define ALIGNMENT 8 +# define USE_GENERIC_PUSH_REGS + /* Gcc and probably the DEC/Compaq compiler spill pointers to preserved */ + /* fp registers in some cases when the target is a 21264. The assembly */ + /* code doesn't handle that yet, and version dependencies make that a */ + /* bit tricky. Do the easy thing for now. */ +# ifdef OSF1 +# define OS_TYPE "OSF1" +# define DATASTART ((ptr_t) 0x140000000) + extern _end; +# define DATAEND ((ptr_t) &_end) +# define HEURISTIC2 + /* Normally HEURISTIC2 is too conervative, since */ + /* the text segment immediately follows the stack. */ + /* Hence we give an upper pound. */ + extern int __start; +# define HEURISTIC2_LIMIT ((ptr_t)((word)(&__start) & ~(getpagesize()-1))) +# define CPP_WORDSZ 64 +# define MPROTECT_VDB +# define DYNAMIC_LOADING +# endif +# ifdef LINUX +# define OS_TYPE "LINUX" +# define CPP_WORDSZ 64 +# define STACKBOTTOM ((ptr_t) 0x120000000) +# ifdef __ELF__ +# define LINUX_DATA_START +# define DYNAMIC_LOADING + /* This doesn't work if the collector is in a dynamic library. */ +# else +# define DATASTART ((ptr_t) 0x140000000) +# endif + extern int _end; +# define DATAEND (&_end) +# define MPROTECT_VDB + /* Has only been superficially tested. May not */ + /* work on all versions. */ +# endif +# endif + +# ifdef IA64 +# define MACH_TYPE "IA64" +# define ALIGN_DOUBLE + /* Requires 16 byte alignment for malloc */ +# define ALIGNMENT 8 +# define USE_GENERIC_PUSH_REGS + /* We need to get preserved registers in addition to register windows. */ + /* That's easiest to do with setjmp. */ +# ifdef HPUX + --> needs work +# endif +# ifdef LINUX +# define OS_TYPE "LINUX" +# define CPP_WORDSZ 64 + /* This should really be done through /proc, but that */ + /* requires we run on an IA64 kernel. */ +# define STACKBOTTOM ((ptr_t) 0xa000000000000000l) + /* We also need the base address of the register stack */ + /* backing store. There is probably a better way to */ + /* get that, too ... */ +# define BACKING_STORE_BASE ((ptr_t) 0x9fffffff80000000l) +# if 1 +# define SEARCH_FOR_DATA_START +# define DATASTART GC_data_start +# else + extern int data_start; +# define DATASTART ((ptr_t)(&data_start)) +# endif +# define DYNAMIC_LOADING +# define MPROTECT_VDB + /* Requires Linux 2.3.47 or later. */ + extern int _end; +# define DATAEND (&_end) + /* PREFETCH appears to have a large performance impact. */ +# define PREFETCH(x) \ + __asm__ (" lfetch [%0]": : "r"((void *)(x))) +# define PREFETCH_FOR_WRITE(x) \ + __asm__ (" lfetch.excl [%0]": : "r"((void *)(x))) +# define CLEAR_DOUBLE(x) \ + __asm__ (" stf.spill [%0]=f0": : "r"((void *)(x))) +# endif +# endif + +# ifdef M88K +# define MACH_TYPE "M88K" +# define ALIGNMENT 4 +# define ALIGN_DOUBLE + extern int etext; +# ifdef CX_UX +# define OS_TYPE "CX_UX" +# define DATASTART ((((word)&etext + 0x3fffff) & ~0x3fffff) + 0x10000) +# endif +# ifdef DGUX +# define OS_TYPE "DGUX" + extern char * GC_SysVGetDataStart(); +# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &etext) +# endif +# define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */ +# endif + +# ifdef S370 +# define MACH_TYPE "S370" +# define OS_TYPE "UTS4" +# define ALIGNMENT 4 /* Required by hardware */ + extern int etext; + extern int _etext; + extern int _end; + extern char * GC_SysVGetDataStart(); +# define DATASTART (ptr_t)GC_SysVGetDataStart(0x10000, &_etext) +# define DATAEND (&_end) +# define HEURISTIC2 +# endif + +# if defined(PJ) +# define ALIGNMENT 4 + extern int _etext; +# define DATASTART ((ptr_t)(&_etext)) +# define HEURISTIC1 +# endif + +# ifdef ARM32 +# define CPP_WORDSZ 32 +# define MACH_TYPE "ARM32" +# define ALIGNMENT 4 +# ifdef NETBSD +# define OS_TYPE "NETBSD" +# define HEURISTIC2 + extern char etext; +# define DATASTART ((ptr_t)(&etext)) +# define USE_GENERIC_PUSH_REGS +# endif +# ifdef LINUX +# define OS_TYPE "LINUX" +# define HEURISTIC1 +# undef STACK_GRAN +# define STACK_GRAN 0x10000000 +# define USE_GENERIC_PUSH_REGS +# ifdef __ELF__ +# define DYNAMIC_LOADING +# include <features.h> +# if defined(__GLIBC__) && __GLIBC__ >= 2 +# define LINUX_DATA_START +# else + extern char **__environ; +# define DATASTART ((ptr_t)(&__environ)) + /* hideous kludge: __environ is the first */ + /* word in crt0.o, and delimits the start */ + /* of the data segment, no matter which */ + /* ld options were passed through. */ + /* We could use _etext instead, but that */ + /* would include .rodata, which may */ + /* contain large read-only data tables */ + /* that we'd rather not scan. */ +# endif + extern int _end; +# define DATAEND (&_end) +# else + extern int etext; +# define DATASTART ((ptr_t)((((word) (&etext)) + 0xfff) & ~0xfff)) +# endif +# endif +#endif + +#ifdef LINUX_DATA_START + /* Some Linux distributions arrange to define __data_start. Some */ + /* define data_start as a weak symbol. The latter is technically */ + /* broken, since the user program may define data_start, in which */ + /* case we lose. Nonetheless, we try both, prefering __data_start. */ + /* We assume gcc. */ +# pragma weak __data_start + extern int __data_start; +# pragma weak data_start + extern int data_start; +# define DATASTART ((ptr_t)(&__data_start != 0? &__data_start : &data_start)) +#endif + +# ifndef STACK_GROWS_UP +# define STACK_GROWS_DOWN +# endif + +# ifndef CPP_WORDSZ +# define CPP_WORDSZ 32 +# endif + +# ifndef OS_TYPE +# define OS_TYPE "" +# endif + +# ifndef DATAEND + extern int end; +# define DATAEND (&end) +# endif + +# if defined(SVR4) && !defined(GETPAGESIZE) +# include <unistd.h> +# define GETPAGESIZE() sysconf(_SC_PAGESIZE) +# endif + +# ifndef GETPAGESIZE +# if defined(SUNOS5) || defined(IRIX5) +# include <unistd.h> +# endif +# define GETPAGESIZE() getpagesize() +# endif + +# if defined(SUNOS5) || defined(DRSNX) || defined(UTS4) + /* OS has SVR4 generic features. Probably others also qualify. */ +# define SVR4 +# endif + +# if defined(SUNOS5) || defined(DRSNX) + /* OS has SUNOS5 style semi-undocumented interface to dynamic */ + /* loader. */ +# define SUNOS5DL + /* OS has SUNOS5 style signal handlers. */ +# define SUNOS5SIGS +# endif + +# if defined(HPUX) +# define SUNOS5SIGS +# endif + +# if CPP_WORDSZ != 32 && CPP_WORDSZ != 64 + -> bad word size +# endif + +# ifdef PCR +# undef DYNAMIC_LOADING +# undef STACKBOTTOM +# undef HEURISTIC1 +# undef HEURISTIC2 +# undef PROC_VDB +# undef MPROTECT_VDB +# define PCR_VDB +# endif + +# ifdef SRC_M3 +/* Postponed for now. */ +# undef PROC_VDB +# undef MPROTECT_VDB +# endif + +# ifdef SMALL_CONFIG +/* Presumably not worth the space it takes. */ +# undef PROC_VDB +# undef MPROTECT_VDB +# endif + +# ifdef USE_MUNMAP +# undef MPROTECT_VDB /* Can't deal with address space holes. */ +# endif + +# if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB) +# define DEFAULT_VDB +# endif + +# ifndef PREFETCH +# define PREFETCH(x) +# define NO_PREFETCH +# endif + +# ifndef PREFETCH_FOR_WRITE +# define PREFETCH_FOR_WRITE(x) +# define NO_PREFETCH_FOR_WRITE +# endif + +# ifndef CACHE_LINE_SIZE +# define CACHE_LINE_SIZE 32 /* Wild guess */ +# endif + +# ifndef CLEAR_DOUBLE +# define CLEAR_DOUBLE(x) \ + ((word*)x)[0] = 0; \ + ((word*)x)[1] = 0; +# endif /* CLEAR_DOUBLE */ + +# if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS) +# define SOLARIS_THREADS +# endif +# if defined(IRIX_THREADS) && !defined(IRIX5) +--> inconsistent configuration +# endif +# if defined(IRIX_JDK_THREADS) && !defined(IRIX5) +--> inconsistent configuration +# endif +# if defined(LINUX_THREADS) && !defined(LINUX) +--> inconsistent configuration +# endif +# if defined(SOLARIS_THREADS) && !defined(SUNOS5) +--> inconsistent configuration +# endif +# if defined(HPUX_THREADS) && !defined(HPUX) +--> inconsistent configuration +# endif +# if defined(PCR) || defined(SRC_M3) || \ + defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \ + defined(IRIX_THREADS) || defined(LINUX_THREADS) || \ + defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS) +# define THREADS +# endif + +# if defined(HP_PA) || defined(M88K) || defined(POWERPC) \ + || (defined(I386) && defined(OS2)) || defined(UTS4) || defined(LINT) + /* Use setjmp based hack to mark from callee-save registers. */ +# define USE_GENERIC_PUSH_REGS +# endif +# if defined(SPARC) && !defined(LINUX) +# define SAVE_CALL_CHAIN +# define ASM_CLEAR_CODE /* Stack clearing is crucial, and we */ + /* include assembly code to do it well. */ +# endif + +# endif /* GCCONFIG_H */ diff --git a/boehm-gc/irix_threads.c b/boehm-gc/hpux_irix_threads.c index 5efca211034..f6e74365216 100644 --- a/boehm-gc/irix_threads.c +++ b/boehm-gc/hpux_irix_threads.c @@ -1,6 +1,7 @@ /* - * Copyright (c) 1994 by Xerox Corporation. All rights reserved. - * Copyright (c) 1996 by Silicon Graphics. All rights reserved. + * Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved. + * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved. + * Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved. * * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. @@ -16,12 +17,19 @@ * not guaranteed by the Pthread standard. It may or may not be portable * to other implementations. * + * This now also includes an initial attempt at thread support for + * HP/UX 11. + * * Note that there is a lot of code duplication between linux_threads.c - * and irix_threads.c; any changes made here may need to be reflected + * and hpux_irix_threads.c; any changes made here may need to be reflected * there too. */ -# if defined(IRIX_THREADS) +# if defined(IRIX_THREADS) || defined(HPUX_THREADS) + +# if defined(HPUX_THREADS) +# include <sys/semaphore.h> +# endif # include "gc_priv.h" # include <pthread.h> @@ -169,8 +177,12 @@ ptr_t GC_stack_alloc(size_t * stack_size) result = (ptr_t) GC_scratch_alloc(search_sz + 2*GC_page_sz); result = (ptr_t)(((word)result + GC_page_sz) & ~(GC_page_sz - 1)); /* Protect hottest page to detect overflow. */ - /* mprotect(result, GC_page_sz, PROT_NONE); */ - result += GC_page_sz; +# ifdef STACK_GROWS_UP + /* mprotect(result + search_sz, GC_page_sz, PROT_NONE); */ +# else + /* mprotect(result, GC_page_sz, PROT_NONE); */ + result += GC_page_sz; +# endif } *stack_size = search_sz; return(result); @@ -375,13 +387,14 @@ int GC_is_thread_stack(ptr_t addr) } # endif -/* We hold allocation lock. We assume the world is stopped. */ +/* We hold allocation lock. Should do exactly the right thing if the */ +/* world is stopped. Should not fail if it isn't. */ void GC_push_all_stacks() { register int i; register GC_thread p; register ptr_t sp = GC_approx_sp(); - register ptr_t lo, hi; + register ptr_t hot, cold; pthread_t me = pthread_self(); if (!GC_thr_initialized) GC_thr_init(); @@ -390,17 +403,25 @@ void GC_push_all_stacks() for (p = GC_threads[i]; p != 0; p = p -> next) { if (p -> flags & FINISHED) continue; if (pthread_equal(p -> id, me)) { - lo = GC_approx_sp(); + hot = GC_approx_sp(); } else { - lo = p -> stack_ptr; + hot = p -> stack_ptr; } if (p -> stack_size != 0) { - hi = p -> stack + p -> stack_size; +# ifdef STACK_GROWS_UP + cold = p -> stack; +# else + cold = p -> stack + p -> stack_size; +# endif } else { /* The original stack. */ - hi = GC_stackbottom; + cold = GC_stackbottom; } - GC_push_all_stack(lo, hi); +# ifdef STACK_GROWS_UP + GC_push_all_stack(cold, hot); +# else + GC_push_all_stack(hot, cold); +# endif } } } @@ -531,6 +552,40 @@ void * GC_start_routine(void * arg) return(result); } +# ifdef HPUX_THREADS + /* pthread_attr_t is not a structure, thus a simple structure copy */ + /* won't work. */ + static void copy_attr(pthread_attr_t * pa_ptr, + const pthread_attr_t * source) { + int tmp; + size_t stmp; + void * vtmp; + struct sched_param sp_tmp; + pthread_spu_t ps_tmp; + (void) pthread_attr_init(pa_ptr); + (void) pthread_attr_getdetachstate(source, &tmp); + (void) pthread_attr_setdetachstate(pa_ptr, tmp); + (void) pthread_attr_getinheritsched(source, &tmp); + (void) pthread_attr_setinheritsched(pa_ptr, tmp); + (void) pthread_attr_getschedpolicy(source, &tmp); + (void) pthread_attr_setschedpolicy(pa_ptr, tmp); + (void) pthread_attr_getstacksize(source, &stmp); + (void) pthread_attr_setstacksize(pa_ptr, stmp); + (void) pthread_attr_getguardsize(source, &stmp); + (void) pthread_attr_setguardsize(pa_ptr, stmp); + (void) pthread_attr_getstackaddr(source, &vtmp); + (void) pthread_attr_setstackaddr(pa_ptr, vtmp); + (void) pthread_attr_getscope(source, &tmp); + (void) pthread_attr_setscope(pa_ptr, tmp); + (void) pthread_attr_getschedparam(source, &sp_tmp); + (void) pthread_attr_setschedparam(pa_ptr, &sp_tmp); + (void) pthread_attr_getprocessor_np(source, &ps_tmp, &tmp); + (void) pthread_attr_setprocessor_np(pa_ptr, ps_tmp, tmp); + } +# else +# define copy_attr(pa_ptr, source) *(pa_ptr) = *(source) +# endif + int GC_pthread_create(pthread_t *new_thread, const pthread_attr_t *attr, @@ -548,7 +603,9 @@ GC_pthread_create(pthread_t *new_thread, /* library, which isn't visible to the collector. */ if (0 == si) return(ENOMEM); - sem_init(&(si -> registered), 0, 0); + if (0 != sem_init(&(si -> registered), 0, 0)) { + ABORT("sem_init failed"); + } si -> start_routine = start_routine; si -> arg = arg; LOCK(); @@ -557,7 +614,7 @@ GC_pthread_create(pthread_t *new_thread, stack = 0; (void) pthread_attr_init(&new_attr); } else { - new_attr = *attr; + copy_attr(&new_attr, attr); pthread_attr_getstackaddr(&new_attr, &stack); } pthread_attr_getstacksize(&new_attr, &stacksize); @@ -586,24 +643,39 @@ GC_pthread_create(pthread_t *new_thread, /* This also ensures that we hold onto si until the child is done */ /* with it. Thus it doesn't matter whether it is otherwise */ /* visible to the collector. */ - if (0 != sem_wait(&(si -> registered))) ABORT("sem_wait failed"); + while (0 != sem_wait(&(si -> registered))) { + if (errno != EINTR) { + GC_printf1("Sem_wait: errno = %ld\n", (unsigned long) errno); + ABORT("sem_wait failed"); + } + } sem_destroy(&(si -> registered)); - /* pthread_attr_destroy(&new_attr); */ + pthread_attr_destroy(&new_attr); /* Not a no-op under HPUX */ return(result); } +#ifndef HPUX_THREADS +/* For now we use the pthreads locking primitives on HP/UX */ + GC_bool GC_collecting = 0; /* A hint that we're in the collector and */ /* holding the allocation lock for an */ /* extended period. */ /* Reasonably fast spin locks. Basically the same implementation */ -/* as STL alloc.h. This isn't really the right way to do this. */ -/* but until the POSIX scheduling mess gets straightened out ... */ - -unsigned long GC_allocate_lock = 0; +/* as STL alloc.h. */ #define SLEEP_THRESHOLD 3 +#ifdef HPUX + unsigned long GC_allocate_lock = 1; +# define GC_TRY_LOCK() GC_test_and_clear(&GC_allocate_lock) +# define GC_LOCK_TAKEN !GC_allocate_lock +#else + unsigned long GC_allocate_lock = 0; +# define GC_TRY_LOCK() !GC_test_and_set(&GC_allocate_lock,1) +# define GC_LOCK_TAKEN GC_allocate_lock +#endif + void GC_lock() { # define low_spin_max 30 /* spin cycles if we suspect uniprocessor */ @@ -616,7 +688,7 @@ void GC_lock() # define PAUSE junk *= junk; junk *= junk; junk *= junk; junk *= junk int i; - if (!GC_test_and_set(&GC_allocate_lock, 1)) { + if (GC_TRY_LOCK()) { return; } junk = 0; @@ -624,11 +696,11 @@ void GC_lock() my_last_spins = last_spins; for (i = 0; i < my_spin_max; i++) { if (GC_collecting) goto yield; - if (i < my_last_spins/2 || GC_allocate_lock) { + if (i < my_last_spins/2 || GC_LOCK_TAKEN) { PAUSE; continue; } - if (!GC_test_and_set(&GC_allocate_lock, 1)) { + if (GC_TRY_LOCK()) { /* * got it! * Spinning worked. Thus we're probably not being scheduled @@ -644,7 +716,7 @@ void GC_lock() spin_max = low_spin_max; yield: for (i = 0;; ++i) { - if (!GC_test_and_set(&GC_allocate_lock, 1)) { + if (GC_TRY_LOCK()) { return; } if (i < SLEEP_THRESHOLD) { @@ -662,7 +734,7 @@ yield: } } - +#endif /* !HPUX_THREADS */ # else diff --git a/boehm-gc/include/backptr.h b/boehm-gc/include/backptr.h new file mode 100644 index 00000000000..f5b7c5aa2b9 --- /dev/null +++ b/boehm-gc/include/backptr.h @@ -0,0 +1,63 @@ +/* + * This is a simple API to implement pointer back tracing, i.e. + * to answer questions such as "who is pointing to this" or + * "why is this object being retained by the collector" + * + * This API assumes that we have an ANSI C compiler. + * + * Most of these calls yield useful information on only after + * a garbage collection. Usually the client will first force + * a full collection and then gather information, preferably + * before much intervening allocation. + * + * The implementation of the interface is only about 99.9999% + * correct. It is intended to be good enough for profiling, + * but is not intended to be used with production code. + * + * Results are likely to be much more useful if all allocation is + * accomplished through the debugging allocators. + * + * The implementation idea is due to A. Demers. + */ + +/* Store information about the object referencing dest in *base_p */ +/* and *offset_p. */ +/* If multiple objects or roots point to dest, the one reported */ +/* will be the last on used by the garbage collector to trace the */ +/* object. */ +/* source is root ==> *base_p = address, *offset_p = 0 */ +/* source is heap object ==> *base_p != 0, *offset_p = offset */ +/* Returns 1 on success, 0 if source couldn't be determined. */ +/* Dest can be any address within a heap object. */ +typedef enum { GC_UNREFERENCED, /* No reference info available. */ + GC_NO_SPACE, /* Dest not allocated with debug alloc */ + GC_REFD_FROM_ROOT, /* Referenced directly by root *base_p */ + GC_REFD_FROM_REG, /* Referenced from a register, i.e. */ + /* a root without an address. */ + GC_REFD_FROM_HEAP, /* Referenced from another heap obj. */ + GC_FINALIZER_REFD /* Finalizable and hence accessible. */ +} GC_ref_kind; + +GC_ref_kind GC_get_back_ptr_info(void *dest, void **base_p, size_t *offset_p); + +/* Generate a random heap address. */ +/* The resulting address is in the heap, but */ +/* not necessarily inside a valid object. */ +void * GC_generate_random_heap_address(void); + +/* Generate a random address inside a valid marked heap object. */ +void * GC_generate_random_valid_address(void); + +/* Force a garbage collection and generate a backtrace from a */ +/* random heap address. */ +/* This uses the GC logging mechanism (GC_printf) to produce */ +/* output. It can often be called from a debugger. The */ +/* source in dbg_mlc.c also serves as a sample client. */ +void GC_generate_random_backtrace(void); + +/* Print a backtrace from a specific address. Used by the */ +/* above. The client should call GC_gcollect() immediately */ +/* before invocation. */ +void GC_print_backtrace(void *); + + diff --git a/boehm-gc/include/gc_copy_descr.h b/boehm-gc/include/gc_copy_descr.h new file mode 100644 index 00000000000..212c99e28dc --- /dev/null +++ b/boehm-gc/include/gc_copy_descr.h @@ -0,0 +1,26 @@ + +/* + * Copyright (c) 1999 by Silicon Graphics. All rights reserved. + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + */ +/* Descriptor for allocation request. May be redefined by client. */ +typedef struct { + GC_word bitmap; /* Bitmap describing pointer locations. */ + /* High order bit correspond to 0th */ + /* word. 2 lsbs must be 0. */ + size_t length; /* In bytes, must be multiple of word */ + /* size. Must be >0, <= 512 */ +} * GC_copy_descriptor; + +/* The collector accesses descriptors only through these two macros. */ +#define GC_SIZE_FROM_DESCRIPTOR(d) ((d) -> length) +#define GC_BIT_MAP_FROM_DESCRIPTOR(d) ((d) -> bitmap) + diff --git a/boehm-gc/include/gc_nursery.h b/boehm-gc/include/gc_nursery.h new file mode 100644 index 00000000000..d109ff090dc --- /dev/null +++ b/boehm-gc/include/gc_nursery.h @@ -0,0 +1,90 @@ + +/* + * Copyright (c) 1999 by Silicon Graphics. All rights reserved. + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + */ + +/* + * THIS IMPLEMENTATION FOR THIS INTERFACE IS INCOMPLETE. + * NONE OF THIS HAS BEEN TESTED. DO NOT USE. + * + * Comments on the interface are appreciated, especially from + * potential users of the interface. + * + * This is a Bartlett style copying collector for young objects. + * We assume for now that all objects allocated through this + * mechanism have pointers only in the first BITMAP_BITS words. + * (On a 32-bit machine, BITMAP_BITS is 30.) + * Objects allocated in this manner should be rarely referenced + * by objects not allocated either through this interface, or through + * the typed allocation interface. + * If this interface is used, we assume that type information provided + * through either this or the typed allocation interface is valid + * in a stronger sense: + * + * 1) No pointers are stored in fields not marked as such. + * (Otherwise it is only necessary that objects referenced by + * fields marked as nonpointers are also reachable via another + * path.) + * 2) Values stored in pointer fields are either not addresses in + * the heap, or they really are pointers. In the latter case, it + * is acceptable to move the object they refer to, and to update + * the pointer. + * + * GC_free may not be invoked on objects allocated with GC_copying_malloc. + * + * No extra space is added to the end of objects allocated through this + * interface. If the client needs to maintain pointers past the + * end, the size should be explicitly padded. + * + * We assume that calls to this will usually be compiler generated. + * Hence the interface is allowed to be a bit ugly in return for speed. + */ + +#include "gc_copy_descr.h" + +/* GC_copy_descr.h must define */ +/* GC_SIZE_FROM_DESCRIPTOR(descr) and */ +/* GC_BIT_MAP_FROM_DESCRIPTOR(descr). */ +/* It may either be the GC supplied version of the header file, or a */ +/* client specific one that derives the information from a client- */ +/* specific type descriptor. */ + +typedef GC_PTR GC_copy_alloc_state; + /* Current allocator state. */ + /* Multiple allocation states */ + /* may be used for concurrent */ + /* allocation, or to enhance */ + /* locality. */ + /* Should be treated as opaque. */ + +/* Allocate a memory block of size given in the descriptor, and with */ +/* pointer layout given by the descriptor. The resulting block may not */ +/* be cleared, and should immediately be initialized by the client. */ +/* (A concurrent GC may see an uninitialized pointer field. If it */ +/* points outside the nursery, that's fine. If it points inside, it */ +/* may retain an object, and be relocated. But that's also fine, since */ +/* the new value will be immediately overwritten. */ +/* This variant acquires the allocation lock, and uses a default */ +/* global allocation state. */ +GC_PTR GC_copying_malloc(GC_copy_descriptor); + +/* A variant of the above that does no locking on the fast path, */ +/* and passes an explicit pointer to an allocation state. */ +/* The allocation state is updated. */ +/* There will eventually need to be a macro or inline function version */ +/* of this. */ +GC_PTR GC_copying_malloc2(GC_copy_descriptor, GC_copy_alloc_state *); + +/* Initialize an allocation state so that it can be used for */ +/* allocation. This implicitly reserves a small section of the */ +/* nursery for use with this allocator. */ +void GC_init_copy_alloc_state(GC_copy_alloc_state *); diff --git a/boehm-gc/makefile.depend b/boehm-gc/makefile.depend new file mode 100644 index 00000000000..e69de29bb2d --- /dev/null +++ b/boehm-gc/makefile.depend diff --git a/boehm-gc/nursery.c b/boehm-gc/nursery.c new file mode 100644 index 00000000000..ab83afbaaf2 --- /dev/null +++ b/boehm-gc/nursery.c @@ -0,0 +1,312 @@ +/* + * Copyright (c) 1999 by Silicon Graphics. All rights reserved. + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + */ + +#ifdef NURSERY +??? This implementation is incomplete. If you are trying to +??? compile this you are doing something wrong. + +#include "nursery.h" + +#define SCAN_STATICS_FOR_NURSERY + /* If this is not defined, the collector will not see */ + /* references from static data areas to the nursery. */ + +struct copy_obj { + ptr_t forward; /* Forwarding link for copied objects. */ + GC_copy_descriptor descr; /* Object descriptor */ + word data[1]; +} + +ptr_t GC_nursery_start; /* Start of nursery area. */ + /* Must be NURSERY_BLOCK_SIZE */ + /* aligned. */ +ptr_t GC_nursery_end; /* End of nursery area. */ +unsigned char * GC_nursery_map; + /* GC_nursery_map[i] != 0 if an object */ + /* starts on the ith 64-bit "word" of */ + /* nursery. This simple structure has */ + /* the advantage that */ + /* allocation is cheap. Lookup is */ + /* cheap for pointers to the head of */ + /* an object, which should be the */ + /* usual case. */ +# define NURSERY_MAP_NOT_START 0 /* Not start of object. */ +# define NURSERY_MAP_START 1 /* Start of object. */ +# define NURSERY_MAP_PINNED 2 /* Start of pinned obj. */ + +# ifdef ALIGN_DOUBLE +# define NURSERY_WORD_SIZE (2 * sizeof(word)) +# else +# define NURSERY_WORD_SIZE sizeof(word) +# endif + +# define NURSERY_BLOCK_SIZE (HBLKSIZE/2) + /* HBLKSIZE must be a multiple of NURSERY_BLOCK_SIZE */ +# define NURSERY_SIZE (1024 * NURSERY_BLOCK_SIZE) + +size_t GC_nursery_size = NURSERY_SIZE; + /* Must be multiple of NURSERY_BLOCK_SIZE */ + +size_t GC_nursery_blocks; /* Number of blocks in the nursery. */ + +unsigned GC_next_nursery_block; /* index of next block we will attempt */ + /* allocate from during this cycle. */ + /* If it is pinned, we won't actually */ + /* use it. */ + +unsigned short *GC_pinned; /* Number of pinned objects in ith */ + /* nursery block. */ + /* GC_pinned[i] != 0 if the ith nursery */ + /* block is pinned, and thus not used */ + /* for allocation. */ + +GC_copy_alloc_state global_alloc_state = (ptr_t)(-1); /* will overflow. */ + +/* Array of known rescuing pointers from the heap to the nursery. */ + ptr_t ** nursery_rescuers; + /* Pointer to one past the last slot in rescuer table */ + ptr_t ** nursery_rescuers_end; + /* Maximum number of known rescuing pointers. */ +# define MAX_NURSERY_RESCUERS 32*1024 + /* Add a rescuer to the list */ +# define ADD_NURSERY_RESCUER(p) \ + if (nursery_rescuers_end >= nursery_rescuers + MAX_NURSERY_RESCUERS) { \ + ABORT("Nursery recuers overflow"); /* Fix later !!! */ \ + } else { \ + *nursery_rescuers_end++ = p; \ + } + /* Remove rescuer at the given position in the table */ +# define REMOVE_RESCUER(p) \ + *p = *--nursery_rescuers_end + +/* Should be called with allocator lock held. */ +GC_nursery_init() { + GC_nursery_start = GET_MEM(GC_nursery_size); + GC_nursery_end = GC_nursery_start + GC_nursery_size; + GC_next_nursery_block = 0; + if (GC_nursery_start < GC_least_plausible_heap_addr) { + GC_least_plausible_heap_addr = GC_nursery_start; + } + if (GC_nursery_end > GC_greatest_plausible_heap_addr) { + GC_greatest_plausible_heap_addr = GC_nursery_end; + } + if (GC_nursery_start & (NURSERY_BLOCK_SIZE-1)) { + GC_err_printf1("Nursery area is misaligned!!"); + /* This should be impossible, since GET_MEM returns HBLKSIZE */ + /* aligned chunks, and that should be a multiple of */ + /* NURSERY_BLOCK_SIZE */ + ABORT("misaligned nursery"); + } + GC_nursery_map = GET_MEM(GC_nursery_size/NURSERY_WORD_SIZE); + /* Map is cleared a block at a time when we allocate from the block. */ + /* BZERO(GC_nursery_map, GC_nursery_size/NURSERY_WORD_SIZE); */ + GC_nursery_blocks = GC_nursery_size/NURSERY_BLOCK_SIZE; + GC_pinned = GC_scratch_alloc(GC_nursery_blocks * sizeof(unsigned short)); + BZERO(GC_pinned, GC_nursery_blocks); + nursery_rescuers = GET_MEM(MAX_NURSERY_RESCUERS * sizeof(ptr_t *)); + nursery_rescuers_end = nursery_rescuers; + if (0 == GC_nursery_start || 0 == GC_nursery_map || 0 == nursery_rescuers) + ABORT("Insufficient memory for nursery"); +} + +#define PIN_OBJ(p) \ + if (p >= GC_nursery_start && p < GC_nursery_end) { GC_pin_obj_checked(p); } + +/* Pin the object at p, if it's in the nursery. */ +void GC_pin_obj(ptr_t p) { + PIN_OBJ(p); +} + +void (*GC_push_proc)(ptr_t) = 0; + +/* Pin the object at p, which is known to be in the nursery. */ +void GC_pin_obj_checked(ptr_t p) { + unsigned offset = p - GC_nursery_start; + unsigned word_offset = BYTES_TO_WORDS(offset); + unsigned blockno = (current - GC_nursery_start)/NURSERY_BLOCK_SIZE; + while (GC_nursery_map[word_offset] == NURSERY_MAP_NOT_START) { + --word_offset; + } + if (GC_nursery_map[word_offset] != NURSERY_MAP_PINNED) { + GC_nursery_map[word_offset] = NURSERY_MAP_PINNED; + ++GC_pinned[blockno]; + ??Push object at GC_nursery_start + WORDS_TO_BYTES(word_offset) + ??onto mark stack. + } +} + +void GC_scan_region_for_nursery(ptr_t low, ptr_t high) { +# if CPP_WORDSZ/8 != ALIGNMENT + --> fix this +# endif + word * l = (word *)((word)low + ALIGNMENT - 1 & ~(ALIGNMENT - 1)); + word * h = (word *)((word)high & ~(ALIGNMENT - 1)); + word * p; + for (p = l; p < h; ++p) { + PIN_OBJ(p); + } +} + +/* Invoke GC_scan_region_for_nursery on ranges that are not excluded. */ +void GC_scan_region_for_nursery_with_exclusions(ptr_t bottom, ptr_t top) +{ + struct exclusion * next; + ptr_t excl_start; + + while (bottom < top) { + next = GC_next_exclusion(bottom); + if (0 == next || (excl_start = next -> e_start) >= top) { + GC_scan_region_for_nursery(bottom, top); + return; + } + if (excl_start > bottom) + GC_scan_region_for_nursery(bottom, excl_start); + bottom = next -> e_end; + } +} + + +void GC_scan_stacks_for_nursery(void) { +# ifdef THREADS + --> fix this +# endif +# ifdef STACK_GROWS_DOWN + ptr_t stack_low = GC_approx_sp(); + ptr_t stack_high = GC_stackbottom; +# else + ptr_t stack_low = GC_stackbottom; + ptr_t stack_high = GC_approx_sp(); +# endif + GC_scan_region_for_nursery(stack_low, stack_high); +# ifdef IA64 + GC_scan_region_for_nursery(BACKING_STORE_BASE, + (ptr_t) GC_save_regs_ret_val); +# endif +} + +void GC_scan_roots_for_nursery(void) { + /* Scan registers. */ + /* Direct GC_push_one to call GC_pin_obj instead of marking */ + /* and pushing objects. */ + /* This is a bit ugly, but we don't have to touch the */ + /* platform-dependent code. */ + + void (*old_push_proc)(ptr_t) = GC_push_proc; + GC_push_proc = GC_pin_obj; + GC_push_regs(); + GC_push_proc = old_push_proc; + GC_scan_stacks_for_nursery(); +# ifdef SCAN_STATICS_FOR_NURSERY +# if (defined(DYNAMIC_LOADING) || defined(MSWIN32) || defined(PCR)) \ + && !defined(SRC_M3) + GC_remove_tmp_roots(); + GC_register_dynamic_libraries(); +# endif + /* Mark everything in static data areas */ + for (i = 0; i < n_root_sets; i++) { + GC_scan_region_for_nursery_with_exclusions ( + GC_static_roots[i].r_start, + GC_static_roots[i].r_end); + } +# endif +} + +/* Array of known rescuing pointers from the heap to the nursery. */ +ptr_t ** nursery_rescuers; + +/* Caller holds allocation lock. */ +void GC_collect_nursery(void) { + int i; + ptr_t scan_ptr = 0; + STOP_WORLD; + for (i = 0; i < GC_nursery_blocks; ++i) GC_pinned[i] = 0; + GC_scan_roots_for_nursery(); + /* All objects referenced by roots are now pinned. */ + /* Their contents are described by */ + /* mark stack entries. */ + + /* Pin blocks corresponding to valid allocation states. */ + /* that probably happens automagically if the allocation */ + /* states are kept where we can see them. */ + /* It will take work if static roots are not scanned. */ + /* We want to do this both for correctness and to avoid */ + /* promoting very young objects. */ + + /* Somehow capture dirty bits. Update rescuers array to */ + /* reflect newly valid and invalid references from dirty */ + /* pages. Other references should remain valid, since the */ + /* referents should have been pinned. */ + + /* Traverse the old object heap. Pin objects in the */ + /* nursery that are ambiguously referenced, copy those */ + /* that are unambiguously referenced. */ + + /* Traverse objects in mark stack. */ + /* If referenced object is in pinned block, add contents */ + /* to mark stack. If referenced object is forwarded, */ + /* update pointer. Otherwise reallocate the object in the */ + /* old heap, copy its contents, and then enqueue its */ + /* contents in the mark stack. */ + START_WORLD; +} + +/* Initialize an allocation state so that it can be used for */ +/* allocation. This implicitly reserves a small section of the */ +/* nursery for use with this allocator. */ +/* Also called to replenish an allocator that has been */ +/* exhausted. */ +void GC_init_copy_alloc_state(GC_copy_alloc_state *) + unsigned next_block; + ptr_t block_addr; + LOCK(); + next_block = GC_next_nursery_block; + while(is_pinned[next_block] && next_block < GC_nursery_blocks) { + ++next_block; + } + if (next_block < GC_nursery_blocks) { + block_addr = GC_nursery_start + NURSERY_BLOCK_SIZE * next_block; + GC_next_nursery_block = next_block + 1; + BZERO(GC_nursery_map + next_block * + (NURSERY_BLOCK_SIZE/NURSERY_WORD_SIZE), + NURSERY_BLOCK_SIZE/NURSERY_WORD_SIZE); + *GC_copy_alloc_state = block_addr; + UNLOCK(); + } else { + GC_collect_nursery(); + GC_next_nursery_block = 0; + UNLOCK(); + get_new_block(s); + } +} + +GC_PTR GC_copying_malloc2(GC_copy_descriptor *d, GC_copy_alloc_state *s) { + size_t sz = GC_SIZE_FROM_DESCRIPTOR(d); + ptrdiff_t offset; + ptr_t result = *s; + ptr_t new = result + sz; + if (new & COPY_BLOCK_MASK <= result & COPY_BLOCK_MASK> { + GC_init_copy_alloc_state(s); + result = *s; + new = result + sz; + GC_ASSERT(new & COPY_BLOCK_MASK > result & COPY_BLOCK_MASK> + } + (struct copy_obj *)result -> descr = d; + (struct copy_obj *)result -> forward = 0; + offset = (result - GC_nursery_start)/NURSERY_WORD_SIZE; + GC_nursery_map[offset] = NURSERY_MAP_NOT_START; +} + +GC_PTR GC_copying_malloc(GC_copy_descriptor *d) { +} + +#endif /* NURSERY */ diff --git a/boehm-gc/solaris_threads.h b/boehm-gc/solaris_threads.h new file mode 100644 index 00000000000..b2cdb36e98d --- /dev/null +++ b/boehm-gc/solaris_threads.h @@ -0,0 +1,34 @@ +#ifdef SOLARIS_THREADS + +/* The set of all known threads. We intercept thread creation and */ +/* joins. We never actually create detached threads. We allocate all */ +/* new thread stacks ourselves. These allow us to maintain this */ +/* data structure. */ +/* Protected by GC_thr_lock. */ +/* Some of this should be declared volatile, but that's incosnsistent */ +/* with some library routine declarations. In particular, the */ +/* definition of cond_t doesn't mention volatile! */ + typedef struct GC_Thread_Rep { + struct GC_Thread_Rep * next; + thread_t id; + word flags; +# define FINISHED 1 /* Thread has exited. */ +# define DETACHED 2 /* Thread is intended to be detached. */ +# define CLIENT_OWNS_STACK 4 + /* Stack was supplied by client. */ +# define SUSPENDED 8 /* Currently suspended. */ + ptr_t stack; + size_t stack_size; + cond_t join_cv; + void * status; + } * GC_thread; + extern GC_thread GC_new_thread(thread_t id); + + extern GC_bool GC_thr_initialized; + extern volatile GC_thread GC_threads[]; + extern size_t GC_min_stack_sz; + extern size_t GC_page_sz; + extern void GC_thr_init(void); + +# endif /* SOLARIS_THREADS */ + diff --git a/boehm-gc/sparc_mach_dep.s b/boehm-gc/sparc_mach_dep.s new file mode 100644 index 00000000000..9831c6ca402 --- /dev/null +++ b/boehm-gc/sparc_mach_dep.s @@ -0,0 +1,38 @@ +! SPARCompiler 3.0 and later apparently no longer handles +! asm outside functions. So we need a separate .s file +! This is only set up for SunOS 5, not SunOS 4. +! Assumes this is called before the stack contents are +! examined. + + .seg "text" + .globl GC_save_regs_in_stack + .globl GC_push_regs +GC_save_regs_in_stack: +GC_push_regs: + ta 0x3 ! ST_FLUSH_WINDOWS + mov %sp,%o0 + retl + nop + + .globl GC_clear_stack_inner +GC_clear_stack_inner: + mov %sp,%o2 ! Save sp + add %sp,-8,%o3 ! p = sp-8 + clr %g1 ! [g0,g1] = 0 + add %o1,-0x60,%sp ! Move sp out of the way, + ! so that traps still work. + ! Includes some extra words + ! so we can be sloppy below. +loop: + std %g0,[%o3] ! *(long long *)p = 0 + cmp %o3,%o1 + bgu loop ! if (p > limit) goto loop + add %o3,-8,%o3 ! p -= 8 (delay slot) + retl + mov %o2,%sp ! Restore sp., delay slot + + + + + + diff --git a/boehm-gc/test.c b/boehm-gc/test.c new file mode 100644 index 00000000000..96a54150a86 --- /dev/null +++ b/boehm-gc/test.c @@ -0,0 +1,1390 @@ +/* + * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers + * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved. + * Copyright (c) 1996 by Silicon Graphics. All rights reserved. + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + */ +/* An incomplete test for the garbage collector. */ +/* Some more obscure entry points are not tested at all. */ + +# undef GC_BUILD + +# if defined(mips) && defined(SYSTYPE_BSD43) + /* MIPS RISCOS 4 */ +# else +# include <stdlib.h> +# endif +# include <stdio.h> +# include <assert.h> /* Not normally used, but handy for debugging. */ +# include "gc.h" +# include "gc_typed.h" +# include "gc_priv.h" /* For output, locking, and some statistics */ +# include "gcconfig.h" + +# ifdef MSWIN32 +# include <windows.h> +# endif + +# ifdef PCR +# include "th/PCR_ThCrSec.h" +# include "th/PCR_Th.h" +# undef GC_printf0 +# define GC_printf0 printf +# undef GC_printf1 +# define GC_printf1 printf +# endif + +# ifdef SOLARIS_THREADS +# include <thread.h> +# include <synch.h> +# endif + +# if defined(IRIX_THREADS) || defined(LINUX_THREADS) || defined(HPUX_THREADS) +# include <pthread.h> +# endif + +# ifdef WIN32_THREADS +# include <process.h> + static CRITICAL_SECTION incr_cs; +# endif + +# ifdef AMIGA + long __stack = 200000; +# endif + +# define FAIL (void)abort() + +/* AT_END may be defined to excercise the interior pointer test */ +/* if the collector is configured with ALL_INTERIOR_POINTERS. */ +/* As it stands, this test should succeed with either */ +/* configuration. In the FIND_LEAK configuration, it should */ +/* find lots of leaks, since we free almost nothing. */ + +struct SEXPR { + struct SEXPR * sexpr_car; + struct SEXPR * sexpr_cdr; +}; + + +typedef struct SEXPR * sexpr; + +# define INT_TO_SEXPR(x) ((sexpr)(unsigned long)(x)) + +# undef nil +# define nil (INT_TO_SEXPR(0)) +# define car(x) ((x) -> sexpr_car) +# define cdr(x) ((x) -> sexpr_cdr) +# define is_nil(x) ((x) == nil) + + +int extra_count = 0; /* Amount of space wasted in cons node */ + +/* Silly implementation of Lisp cons. Intentionally wastes lots of space */ +/* to test collector. */ +sexpr cons (x, y) +sexpr x; +sexpr y; +{ + register sexpr r; + register int *p; + register int my_extra = extra_count; + + r = (sexpr) GC_MALLOC_STUBBORN(sizeof(struct SEXPR) + my_extra); + if (r == 0) { + (void)GC_printf0("Out of memory\n"); + exit(1); + } + for (p = (int *)r; + ((char *)p) < ((char *)r) + my_extra + sizeof(struct SEXPR); p++) { + if (*p) { + (void)GC_printf1("Found nonzero at 0x%lx - allocator is broken\n", + (unsigned long)p); + FAIL; + } + *p = 13; + } +# ifdef AT_END + r = (sexpr)((char *)r + (my_extra & ~7)); +# endif + r -> sexpr_car = x; + r -> sexpr_cdr = y; + my_extra++; + if ( my_extra >= 5000 ) { + extra_count = 0; + } else { + extra_count = my_extra; + } + GC_END_STUBBORN_CHANGE((char *)r); + return(r); +} + +sexpr small_cons (x, y) +sexpr x; +sexpr y; +{ + register sexpr r; + + r = (sexpr) GC_MALLOC(sizeof(struct SEXPR)); + if (r == 0) { + (void)GC_printf0("Out of memory\n"); + exit(1); + } + r -> sexpr_car = x; + r -> sexpr_cdr = y; + return(r); +} + +sexpr small_cons_uncollectable (x, y) +sexpr x; +sexpr y; +{ + register sexpr r; + + r = (sexpr) GC_MALLOC_UNCOLLECTABLE(sizeof(struct SEXPR)); + if (r == 0) { + (void)GC_printf0("Out of memory\n"); + exit(1); + } + r -> sexpr_car = x; + r -> sexpr_cdr = (sexpr)(~(unsigned long)y); + return(r); +} + +#ifdef GC_GCJ_SUPPORT + +#include "gc_mark.h" +#include "dbg_mlc.h" +#include "include/gc_gcj.h" + +/* The following struct emulates the vtable in gcj. */ +/* This assumes the default value of MARK_DESCR_OFFSET. */ +struct fake_vtable { + void * dummy; /* class pointer in real gcj. */ + size_t descr; +}; + +struct fake_vtable gcj_class_struct1 = { 0, sizeof(struct SEXPR) + + sizeof(struct fake_vtable *) }; + /* length based descriptor. */ +struct fake_vtable gcj_class_struct2 = + { 0, (3l << (CPP_WORDSZ - 3)) | DS_BITMAP}; + /* Bitmap based descriptor. */ + +struct ms_entry * fake_gcj_mark_proc(word * addr, + struct ms_entry *mark_stack_ptr, + struct ms_entry *mark_stack_limit, + word env ) +{ + sexpr x; + if (1 == env) { + /* Object allocated with debug allocator. */ + addr = (word *)USR_PTR_FROM_BASE(addr); + } + x = (sexpr)(addr + 1); /* Skip the vtable pointer. */ + /* We could just call PUSH_CONTENTS directly here. But any real */ + /* real client would try to filter out the obvious misses. */ + if (0 != x -> sexpr_cdr) { + PUSH_CONTENTS((ptr_t)(x -> sexpr_cdr), mark_stack_ptr, + mark_stack_limit, &(x -> sexpr_cdr), exit1); + } + if ((ptr_t)(x -> sexpr_car) > GC_least_plausible_heap_addr) { + PUSH_CONTENTS((ptr_t)(x -> sexpr_car), mark_stack_ptr, + mark_stack_limit, &(x -> sexpr_car), exit2); + } + return(mark_stack_ptr); +} + +sexpr gcj_cons(x, y) +sexpr x; +sexpr y; +{ + GC_word * r; + sexpr result; + static int count = 0; + + if (++count & 1) { + r = (GC_word *) GC_GCJ_FAST_MALLOC(3, &gcj_class_struct1); + } else { + r = (GC_word *) GC_GCJ_MALLOC(sizeof(struct SEXPR) + + sizeof(struct fake_vtable*), + &gcj_class_struct2); + } + if (r == 0) { + (void)GC_printf0("Out of memory\n"); + exit(1); + } + result = (sexpr)(r + 1); + result -> sexpr_car = x; + result -> sexpr_cdr = y; + return(result); +} +#endif + +/* Return reverse(x) concatenated with y */ +sexpr reverse1(x, y) +sexpr x, y; +{ + if (is_nil(x)) { + return(y); + } else { + return( reverse1(cdr(x), cons(car(x), y)) ); + } +} + +sexpr reverse(x) +sexpr x; +{ + return( reverse1(x, nil) ); +} + +sexpr ints(low, up) +int low, up; +{ + if (low > up) { + return(nil); + } else { + return(small_cons(small_cons(INT_TO_SEXPR(low), nil), ints(low+1, up))); + } +} + +#ifdef GC_GCJ_SUPPORT +/* Return reverse(x) concatenated with y */ +sexpr gcj_reverse1(x, y) +sexpr x, y; +{ + if (is_nil(x)) { + return(y); + } else { + return( gcj_reverse1(cdr(x), gcj_cons(car(x), y)) ); + } +} + +sexpr gcj_reverse(x) +sexpr x; +{ + return( gcj_reverse1(x, nil) ); +} + +sexpr gcj_ints(low, up) +int low, up; +{ + if (low > up) { + return(nil); + } else { + return(gcj_cons(gcj_cons(INT_TO_SEXPR(low), nil), gcj_ints(low+1, up))); + } +} +#endif /* GC_GCJ_SUPPORT */ + +/* To check uncollectable allocation we build lists with disguised cdr */ +/* pointers, and make sure they don't go away. */ +sexpr uncollectable_ints(low, up) +int low, up; +{ + if (low > up) { + return(nil); + } else { + return(small_cons_uncollectable(small_cons(INT_TO_SEXPR(low), nil), + uncollectable_ints(low+1, up))); + } +} + +void check_ints(list, low, up) +sexpr list; +int low, up; +{ + if ((int)(GC_word)(car(car(list))) != low) { + (void)GC_printf0( + "List reversal produced incorrect list - collector is broken\n"); + FAIL; + } + if (low == up) { + if (cdr(list) != nil) { + (void)GC_printf0("List too long - collector is broken\n"); + FAIL; + } + } else { + check_ints(cdr(list), low+1, up); + } +} + +# define UNCOLLECTABLE_CDR(x) (sexpr)(~(unsigned long)(cdr(x))) + +void check_uncollectable_ints(list, low, up) +sexpr list; +int low, up; +{ +assert(GC_is_marked(list)); + if ((int)(GC_word)(car(car(list))) != low) { + (void)GC_printf0( + "Uncollectable list corrupted - collector is broken\n"); + FAIL; + } + if (low == up) { + if (UNCOLLECTABLE_CDR(list) != nil) { + (void)GC_printf0("Uncollectable list too long - collector is broken\n"); + FAIL; + } + } else { + check_uncollectable_ints(UNCOLLECTABLE_CDR(list), low+1, up); + } +} + +/* Not used, but useful for debugging: */ +void print_int_list(x) +sexpr x; +{ + if (is_nil(x)) { + (void)GC_printf0("NIL\n"); + } else { + (void)GC_printf1("(%ld)", (long)(car(car(x)))); + if (!is_nil(cdr(x))) { + (void)GC_printf0(", "); + (void)print_int_list(cdr(x)); + } else { + (void)GC_printf0("\n"); + } + } +} + +/* Try to force a to be strangely aligned */ +struct { + char dummy; + sexpr aa; +} A; +#define a A.aa + +/* + * A tiny list reversal test to check thread creation. + */ +#ifdef THREADS + +# ifdef WIN32_THREADS + unsigned __stdcall tiny_reverse_test(void * arg) +# else + void * tiny_reverse_test(void * arg) +# endif +{ + check_ints(reverse(reverse(ints(1,10))), 1, 10); + return 0; +} + +# if defined(IRIX_THREADS) || defined(LINUX_THREADS) \ + || defined(SOLARIS_PTHREADS) || defined(HPUX_THREADS) + void fork_a_thread() + { + pthread_t t; + int code; + if ((code = pthread_create(&t, 0, tiny_reverse_test, 0)) != 0) { + (void)GC_printf1("Small thread creation failed %lu\n", + (unsigned long)code); + FAIL; + } + if ((code = pthread_join(t, 0)) != 0) { + (void)GC_printf1("Small thread join failed %lu\n", + (unsigned long)code); + FAIL; + } + } + +# elif defined(WIN32_THREADS) + void fork_a_thread() + { + unsigned thread_id; + HANDLE h; + h = (HANDLE)_beginthreadex(NULL, 0, tiny_reverse_test, + 0, 0, &thread_id); + if (h == (HANDLE)-1) { + (void)GC_printf1("Small thread creation failed %lu\n", + (unsigned long)GetLastError()); + FAIL; + } + if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) { + (void)GC_printf1("Small thread wait failed %lu\n", + (unsigned long)GetLastError()); + FAIL; + } + } + +/* # elif defined(SOLARIS_THREADS) */ + +# else + +# define fork_a_thread() + +# endif + +#else + +# define fork_a_thread() + +#endif + +/* + * Repeatedly reverse lists built out of very different sized cons cells. + * Check that we didn't lose anything. + */ +void reverse_test() +{ + int i; + sexpr b; + sexpr c; + sexpr d; + sexpr e; + sexpr *f, *g, *h; +# if defined(MSWIN32) || defined(MACOS) + /* Win32S only allows 128K stacks */ +# define BIG 1000 +# else +# if defined PCR + /* PCR default stack is 100K. Stack frames are up to 120 bytes. */ +# define BIG 700 +# else +# define BIG 4500 +# endif +# endif + + A.dummy = 17; + a = ints(1, 49); + b = ints(1, 50); + c = ints(1, BIG); + d = uncollectable_ints(1, 100); + e = uncollectable_ints(1, 1); + /* Check that realloc updates object descriptors correctly */ + f = (sexpr *)GC_MALLOC(4 * sizeof(sexpr)); + f = (sexpr *)GC_REALLOC((GC_PTR)f, 6 * sizeof(sexpr)); + f[5] = ints(1,17); + g = (sexpr *)GC_MALLOC(513 * sizeof(sexpr)); + g = (sexpr *)GC_REALLOC((GC_PTR)g, 800 * sizeof(sexpr)); + g[799] = ints(1,18); + h = (sexpr *)GC_MALLOC(1025 * sizeof(sexpr)); + h = (sexpr *)GC_REALLOC((GC_PTR)h, 2000 * sizeof(sexpr)); +# ifdef GC_GCJ_SUPPORT + h[1999] = gcj_ints(1,200); + h[1999] = gcj_reverse(h[1999]); +# else + h[1999] = ints(1,200); +# endif + /* Try to force some collections and reuse of small list elements */ + for (i = 0; i < 10; i++) { + (void)ints(1, BIG); + } + /* Superficially test interior pointer recognition on stack */ + c = (sexpr)((char *)c + sizeof(char *)); + d = (sexpr)((char *)d + sizeof(char *)); + +# ifdef __STDC__ + GC_FREE((void *)e); +# else + GC_FREE((char *)e); +# endif + check_ints(b,1,50); + check_ints(a,1,49); + for (i = 0; i < 50; i++) { + check_ints(b,1,50); + b = reverse(reverse(b)); + } + check_ints(b,1,50); + check_ints(a,1,49); + for (i = 0; i < 60; i++) { + if (i % 10 == 0) fork_a_thread(); + /* This maintains the invariant that a always points to a list of */ + /* 49 integers. Thus this is thread safe without locks, */ + /* assuming atomic pointer assignments. */ + a = reverse(reverse(a)); +# if !defined(AT_END) && !defined(THREADS) + /* This is not thread safe, since realloc explicitly deallocates */ + if (i & 1) { + a = (sexpr)GC_REALLOC((GC_PTR)a, 500); + } else { + a = (sexpr)GC_REALLOC((GC_PTR)a, 8200); + } +# endif + } + check_ints(a,1,49); + check_ints(b,1,50); + c = (sexpr)((char *)c - sizeof(char *)); + d = (sexpr)((char *)d - sizeof(char *)); + check_ints(c,1,BIG); + check_uncollectable_ints(d, 1, 100); + check_ints(f[5], 1,17); + check_ints(g[799], 1,18); +# ifdef GC_GCJ_SUPPORT + h[1999] = gcj_reverse(h[1999]); +# endif + check_ints(h[1999], 1,200); +# ifndef THREADS + a = 0; +# endif + b = c = 0; +} + +/* + * The rest of this builds balanced binary trees, checks that they don't + * disappear, and tests finalization. + */ +typedef struct treenode { + int level; + struct treenode * lchild; + struct treenode * rchild; +} tn; + +int finalizable_count = 0; +int finalized_count = 0; +VOLATILE int dropped_something = 0; + +# ifdef __STDC__ + void finalizer(void * obj, void * client_data) +# else + void finalizer(obj, client_data) + char * obj; + char * client_data; +# endif +{ + tn * t = (tn *)obj; + +# ifdef PCR + PCR_ThCrSec_EnterSys(); +# endif +# ifdef SOLARIS_THREADS + static mutex_t incr_lock; + mutex_lock(&incr_lock); +# endif +# if defined(IRIX_THREADS) || defined(LINUX_THREADS) || defined(HPUX_THREADS) + static pthread_mutex_t incr_lock = PTHREAD_MUTEX_INITIALIZER; + pthread_mutex_lock(&incr_lock); +# endif +# ifdef WIN32_THREADS + EnterCriticalSection(&incr_cs); +# endif + if ((int)(GC_word)client_data != t -> level) { + (void)GC_printf0("Wrong finalization data - collector is broken\n"); + FAIL; + } + finalized_count++; +# ifdef PCR + PCR_ThCrSec_ExitSys(); +# endif +# ifdef SOLARIS_THREADS + mutex_unlock(&incr_lock); +# endif +# if defined(IRIX_THREADS) || defined(LINUX_THREADS) || defined(HPUX_THREADS) + pthread_mutex_unlock(&incr_lock); +# endif +# ifdef WIN32_THREADS + LeaveCriticalSection(&incr_cs); +# endif +} + +size_t counter = 0; + +# define MAX_FINALIZED 8000 + +# if !defined(MACOS) + GC_FAR GC_word live_indicators[MAX_FINALIZED] = {0}; +#else + /* Too big for THINK_C. have to allocate it dynamically. */ + GC_word *live_indicators = 0; +#endif + +int live_indicators_count = 0; + +tn * mktree(n) +int n; +{ + tn * result = (tn *)GC_MALLOC(sizeof(tn)); + +#if defined(MACOS) + /* get around static data limitations. */ + if (!live_indicators) + live_indicators = + (GC_word*)NewPtrClear(MAX_FINALIZED * sizeof(GC_word)); + if (!live_indicators) { + (void)GC_printf0("Out of memory\n"); + exit(1); + } +#endif + if (n == 0) return(0); + if (result == 0) { + (void)GC_printf0("Out of memory\n"); + exit(1); + } + result -> level = n; + result -> lchild = mktree(n-1); + result -> rchild = mktree(n-1); + if (counter++ % 17 == 0 && n >= 2) { + tn * tmp = result -> lchild -> rchild; + + result -> lchild -> rchild = result -> rchild -> lchild; + result -> rchild -> lchild = tmp; + } + if (counter++ % 119 == 0) { + int my_index; + + { +# ifdef PCR + PCR_ThCrSec_EnterSys(); +# endif +# ifdef SOLARIS_THREADS + static mutex_t incr_lock; + mutex_lock(&incr_lock); +# endif +# if defined(IRIX_THREADS) || defined(LINUX_THREADS) \ + || defined(HPUX_THREADS) + static pthread_mutex_t incr_lock = PTHREAD_MUTEX_INITIALIZER; + pthread_mutex_lock(&incr_lock); +# endif +# ifdef WIN32_THREADS + EnterCriticalSection(&incr_cs); +# endif + /* Losing a count here causes erroneous report of failure. */ + finalizable_count++; + my_index = live_indicators_count++; +# ifdef PCR + PCR_ThCrSec_ExitSys(); +# endif +# ifdef SOLARIS_THREADS + mutex_unlock(&incr_lock); +# endif +# if defined(IRIX_THREADS) || defined(LINUX_THREADS) \ + || defined(HPUX_THREADS) + pthread_mutex_unlock(&incr_lock); +# endif +# ifdef WIN32_THREADS + LeaveCriticalSection(&incr_cs); +# endif + } + + GC_REGISTER_FINALIZER((GC_PTR)result, finalizer, (GC_PTR)(GC_word)n, + (GC_finalization_proc *)0, (GC_PTR *)0); + if (my_index >= MAX_FINALIZED) { + GC_printf0("live_indicators overflowed\n"); + FAIL; + } + live_indicators[my_index] = 13; + if (GC_GENERAL_REGISTER_DISAPPEARING_LINK( + (GC_PTR *)(&(live_indicators[my_index])), + (GC_PTR)result) != 0) { + GC_printf0("GC_general_register_disappearing_link failed\n"); + FAIL; + } + if (GC_unregister_disappearing_link( + (GC_PTR *) + (&(live_indicators[my_index]))) == 0) { + GC_printf0("GC_unregister_disappearing_link failed\n"); + FAIL; + } + if (GC_GENERAL_REGISTER_DISAPPEARING_LINK( + (GC_PTR *)(&(live_indicators[my_index])), + (GC_PTR)result) != 0) { + GC_printf0("GC_general_register_disappearing_link failed 2\n"); + FAIL; + } + } + return(result); +} + +void chktree(t,n) +tn *t; +int n; +{ + if (n == 0 && t != 0) { + (void)GC_printf0("Clobbered a leaf - collector is broken\n"); + FAIL; + } + if (n == 0) return; + if (t -> level != n) { + (void)GC_printf1("Lost a node at level %lu - collector is broken\n", + (unsigned long)n); + FAIL; + } + if (counter++ % 373 == 0) (void) GC_MALLOC(counter%5001); + chktree(t -> lchild, n-1); + if (counter++ % 73 == 0) (void) GC_MALLOC(counter%373); + chktree(t -> rchild, n-1); +} + +# if defined(SOLARIS_THREADS) && !defined(_SOLARIS_PTHREADS) +thread_key_t fl_key; + +void * alloc8bytes() +{ +# if defined(SMALL_CONFIG) || defined(GC_DEBUG) + return(GC_MALLOC(8)); +# else + void ** my_free_list_ptr; + void * my_free_list; + + if (thr_getspecific(fl_key, (void **)(&my_free_list_ptr)) != 0) { + (void)GC_printf0("thr_getspecific failed\n"); + FAIL; + } + if (my_free_list_ptr == 0) { + my_free_list_ptr = GC_NEW_UNCOLLECTABLE(void *); + if (thr_setspecific(fl_key, my_free_list_ptr) != 0) { + (void)GC_printf0("thr_setspecific failed\n"); + FAIL; + } + } + my_free_list = *my_free_list_ptr; + if (my_free_list == 0) { + my_free_list = GC_malloc_many(8); + if (my_free_list == 0) { + (void)GC_printf0("alloc8bytes out of memory\n"); + FAIL; + } + } + *my_free_list_ptr = GC_NEXT(my_free_list); + GC_NEXT(my_free_list) = 0; + return(my_free_list); +# endif +} + +#else + +# if defined(_SOLARIS_PTHREADS) || defined(IRIX_THREADS) \ + || defined(LINUX_THREADS) || defined(HPUX_THREADS) +pthread_key_t fl_key; + +void * alloc8bytes() +{ +# ifdef SMALL_CONFIG + return(GC_malloc(8)); +# else + void ** my_free_list_ptr; + void * my_free_list; + + my_free_list_ptr = (void **)pthread_getspecific(fl_key); + if (my_free_list_ptr == 0) { + my_free_list_ptr = GC_NEW_UNCOLLECTABLE(void *); + if (pthread_setspecific(fl_key, my_free_list_ptr) != 0) { + (void)GC_printf0("pthread_setspecific failed\n"); + FAIL; + } + } + my_free_list = *my_free_list_ptr; + if (my_free_list == 0) { + my_free_list = GC_malloc_many(8); + if (my_free_list == 0) { + (void)GC_printf0("alloc8bytes out of memory\n"); + FAIL; + } + } + *my_free_list_ptr = GC_NEXT(my_free_list); + GC_NEXT(my_free_list) = 0; + return(my_free_list); +# endif +} + +# else +# define alloc8bytes() GC_MALLOC_ATOMIC(8) +# endif +#endif + +void alloc_small(n) +int n; +{ + register int i; + + for (i = 0; i < n; i += 8) { + if (alloc8bytes() == 0) { + (void)GC_printf0("Out of memory\n"); + FAIL; + } + } +} + +# if defined(THREADS) && defined(GC_DEBUG) +# define TREE_HEIGHT 15 +# else +# define TREE_HEIGHT 16 +# endif +void tree_test() +{ + tn * root; + register int i; + + root = mktree(TREE_HEIGHT); + alloc_small(5000000); + chktree(root, TREE_HEIGHT); + if (finalized_count && ! dropped_something) { + (void)GC_printf0("Premature finalization - collector is broken\n"); + FAIL; + } + dropped_something = 1; + GC_noop(root); /* Root needs to remain live until */ + /* dropped_something is set. */ + root = mktree(TREE_HEIGHT); + chktree(root, TREE_HEIGHT); + for (i = TREE_HEIGHT; i >= 0; i--) { + root = mktree(i); + chktree(root, i); + } + alloc_small(5000000); +} + +unsigned n_tests = 0; + +GC_word bm_huge[10] = { + 0xffffffff, + 0xffffffff, + 0xffffffff, + 0xffffffff, + 0xffffffff, + 0xffffffff, + 0xffffffff, + 0xffffffff, + 0xffffffff, + 0x00ffffff, +}; + + +/* A very simple test of explicitly typed allocation */ +void typed_test() +{ + GC_word * old, * new; + GC_word bm3 = 0x3; + GC_word bm2 = 0x2; + GC_word bm_large = 0xf7ff7fff; + GC_descr d1 = GC_make_descriptor(&bm3, 2); + GC_descr d2 = GC_make_descriptor(&bm2, 2); +# ifndef LINT + GC_descr dummy = GC_make_descriptor(&bm_large, 32); +# endif + GC_descr d3 = GC_make_descriptor(&bm_large, 32); + GC_descr d4 = GC_make_descriptor(bm_huge, 320); + GC_word * x = (GC_word *)GC_malloc_explicitly_typed(2000, d4); + register int i; + + old = 0; + for (i = 0; i < 4000; i++) { + new = (GC_word *) GC_malloc_explicitly_typed(4 * sizeof(GC_word), d1); + if (0 != new[0] || 0 != new[1]) { + GC_printf0("Bad initialization by GC_malloc_explicitly_typed\n"); + FAIL; + } + new[0] = 17; + new[1] = (GC_word)old; + old = new; + new = (GC_word *) GC_malloc_explicitly_typed(4 * sizeof(GC_word), d2); + new[0] = 17; + new[1] = (GC_word)old; + old = new; + new = (GC_word *) GC_malloc_explicitly_typed(33 * sizeof(GC_word), d3); + new[0] = 17; + new[1] = (GC_word)old; + old = new; + new = (GC_word *) GC_calloc_explicitly_typed(4, 2 * sizeof(GC_word), + d1); + new[0] = 17; + new[1] = (GC_word)old; + old = new; + if (i & 0xff) { + new = (GC_word *) GC_calloc_explicitly_typed(7, 3 * sizeof(GC_word), + d2); + } else { + new = (GC_word *) GC_calloc_explicitly_typed(1001, + 3 * sizeof(GC_word), + d2); + if (0 != new[0] || 0 != new[1]) { + GC_printf0("Bad initialization by GC_malloc_explicitly_typed\n"); + FAIL; + } + } + new[0] = 17; + new[1] = (GC_word)old; + old = new; + } + for (i = 0; i < 20000; i++) { + if (new[0] != 17) { + (void)GC_printf1("typed alloc failed at %lu\n", + (unsigned long)i); + FAIL; + } + new[0] = 0; + old = new; + new = (GC_word *)(old[1]); + } + GC_gcollect(); + GC_noop(x); +} + +int fail_count = 0; + +#ifndef __STDC__ +/*ARGSUSED*/ +void fail_proc1(x) +GC_PTR x; +{ + fail_count++; +} + +#else + +/*ARGSUSED*/ +void fail_proc1(GC_PTR x) +{ + fail_count++; +} + +#endif /* __STDC__ */ + +#ifdef THREADS +# define TEST_FAIL_COUNT(n) 1 +#else +# define TEST_FAIL_COUNT(n) (fail_count >= (n)) +#endif + +void run_one_test() +{ + char *x; +# ifdef LINT + char *y = 0; +# else + char *y = (char *)(size_t)fail_proc1; +# endif + DCL_LOCK_STATE; + +# ifdef FIND_LEAK + (void)GC_printf0( + "This test program is not designed for leak detection mode\n"); + (void)GC_printf0("Expect lots of problems.\n"); +# endif + if (GC_size(GC_malloc(7)) != 8 + || GC_size(GC_malloc(15)) != 16) { + (void)GC_printf0("GC_size produced unexpected results\n"); + FAIL; + } + if (GC_size(GC_malloc(0)) != 4 && GC_size(GC_malloc(0)) != 8) { + (void)GC_printf0("GC_malloc(0) failed\n"); + FAIL; + } + if (GC_size(GC_malloc_uncollectable(0)) != 4 + && GC_size(GC_malloc_uncollectable(0)) != 8) { + (void)GC_printf0("GC_malloc_uncollectable(0) failed\n"); + FAIL; + } + GC_FREE(0); + GC_is_valid_displacement_print_proc = fail_proc1; + GC_is_visible_print_proc = fail_proc1; + x = GC_malloc(16); + if (GC_base(x + 13) != x) { + (void)GC_printf0("GC_base(heap ptr) produced incorrect result\n"); + FAIL; + } +# ifndef PCR + if (GC_base(y) != 0) { + (void)GC_printf0("GC_base(fn_ptr) produced incorrect result\n"); + FAIL; + } +# endif + if (GC_same_obj(x+5, x) != x + 5) { + (void)GC_printf0("GC_same_obj produced incorrect result\n"); + FAIL; + } + if (GC_is_visible(y) != y || GC_is_visible(x) != x) { + (void)GC_printf0("GC_is_visible produced incorrect result\n"); + FAIL; + } + if (!TEST_FAIL_COUNT(1)) { +# if!(defined(RS6000) || defined(POWERPC) || defined(IA64)) + /* ON RS6000s function pointers point to a descriptor in the */ + /* data segment, so there should have been no failures. */ + (void)GC_printf0("GC_is_visible produced wrong failure indication\n"); + FAIL; +# endif + } + if (GC_is_valid_displacement(y) != y + || GC_is_valid_displacement(x) != x + || GC_is_valid_displacement(x + 3) != x + 3) { + (void)GC_printf0( + "GC_is_valid_displacement produced incorrect result\n"); + FAIL; + } +# ifndef ALL_INTERIOR_POINTERS +# if defined(RS6000) || defined(POWERPC) + if (!TEST_FAIL_COUNT(1)) { +# else + if (!TEST_FAIL_COUNT(2)) { +# endif + (void)GC_printf0("GC_is_valid_displacement produced wrong failure indication\n"); + FAIL; + } +# endif + /* Test floating point alignment */ + *(double *)GC_MALLOC(sizeof(double)) = 1.0; + *(double *)GC_MALLOC(sizeof(double)) = 1.0; +# ifdef GC_GCJ_SUPPORT + GC_REGISTER_DISPLACEMENT(sizeof(struct fake_vtable *)); + GC_init_gcj_malloc(0, (void *)fake_gcj_mark_proc); +# endif + /* Repeated list reversal test. */ + reverse_test(); +# ifdef PRINTSTATS + GC_printf0("-------------Finished reverse_test\n"); +# endif + typed_test(); +# ifdef PRINTSTATS + GC_printf0("-------------Finished typed_test\n"); +# endif + tree_test(); + LOCK(); + n_tests++; + UNLOCK(); + /* GC_printf1("Finished %x\n", pthread_self()); */ +} + +void check_heap_stats() +{ + unsigned long max_heap_sz; + register int i; + int still_live; + int late_finalize_count = 0; + + if (sizeof(char *) > 4) { + max_heap_sz = 15000000; + } else { + max_heap_sz = 11000000; + } +# ifdef GC_DEBUG + max_heap_sz *= 2; +# ifdef SPARC + max_heap_sz *= 2; +# endif +# endif + /* Garbage collect repeatedly so that all inaccessible objects */ + /* can be finalized. */ + while (GC_collect_a_little()) { } + for (i = 0; i < 16; i++) { + GC_gcollect(); + late_finalize_count += GC_invoke_finalizers(); + } + (void)GC_printf1("Completed %lu tests\n", (unsigned long)n_tests); + (void)GC_printf2("Finalized %lu/%lu objects - ", + (unsigned long)finalized_count, + (unsigned long)finalizable_count); +# ifdef FINALIZE_ON_DEMAND + if (finalized_count != late_finalize_count) { + (void)GC_printf0("Demand finalization error\n"); + FAIL; + } +# endif + if (finalized_count > finalizable_count + || finalized_count < finalizable_count/2) { + (void)GC_printf0("finalization is probably broken\n"); + FAIL; + } else { + (void)GC_printf0("finalization is probably ok\n"); + } + still_live = 0; + for (i = 0; i < MAX_FINALIZED; i++) { + if (live_indicators[i] != 0) { + still_live++; + } + } + i = finalizable_count - finalized_count - still_live; + if (0 != i) { + (void)GC_printf2 + ("%lu disappearing links remain and %lu more objects were not finalized\n", + (unsigned long) still_live, (unsigned long)i); + if (i > 10) { + GC_printf0("\tVery suspicious!\n"); + } else { + GC_printf0("\tSlightly suspicious, but probably OK.\n"); + } + } + (void)GC_printf1("Total number of bytes allocated is %lu\n", + (unsigned long) + WORDS_TO_BYTES(GC_words_allocd + GC_words_allocd_before_gc)); + (void)GC_printf1("Final heap size is %lu bytes\n", + (unsigned long)GC_get_heap_size()); + if (WORDS_TO_BYTES(GC_words_allocd + GC_words_allocd_before_gc) + < 33500000*n_tests) { + (void)GC_printf0("Incorrect execution - missed some allocations\n"); + FAIL; + } + if (GC_get_heap_size() > max_heap_sz*n_tests) { + (void)GC_printf0("Unexpected heap growth - collector may be broken\n"); + FAIL; + } + (void)GC_printf0("Collector appears to work\n"); +} + +#if defined(MACOS) +void SetMinimumStack(long minSize) +{ + long newApplLimit; + + if (minSize > LMGetDefltStack()) + { + newApplLimit = (long) GetApplLimit() + - (minSize - LMGetDefltStack()); + SetApplLimit((Ptr) newApplLimit); + MaxApplZone(); + } +} + +#define cMinStackSpace (512L * 1024L) + +#endif + +#ifdef __STDC__ + void warn_proc(char *msg, GC_word p) +#else + void warn_proc(msg, p) + char *msg; + GC_word p; +#endif +{ + GC_printf1(msg, (unsigned long)p); + FAIL; +} + + +#if !defined(PCR) && !defined(SOLARIS_THREADS) && !defined(WIN32_THREADS) \ + && !defined(IRIX_THREADS) && !defined(LINUX_THREADS) \ + && !defined(HPUX_THREADS) || defined(LINT) +#if defined(MSWIN32) && !defined(__MINGW32__) + int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prev, LPSTR cmd, int n) +#else + int main() +#endif +{ +# if defined(DJGPP) + int dummy; +# endif + n_tests = 0; + +# if defined(DJGPP) + /* No good way to determine stack base from library; do it */ + /* manually on this platform. */ + GC_stackbottom = (GC_PTR)(&dummy); +# endif +# if defined(MACOS) + /* Make sure we have lots and lots of stack space. */ + SetMinimumStack(cMinStackSpace); + /* Cheat and let stdio initialize toolbox for us. */ + printf("Testing GC Macintosh port.\n"); +# endif + GC_INIT(); /* Only needed if gc is dynamic library. */ + (void) GC_set_warn_proc(warn_proc); +# if defined(MPROTECT_VDB) || defined(PROC_VDB) + GC_enable_incremental(); + (void) GC_printf0("Switched to incremental mode\n"); +# if defined(MPROTECT_VDB) + (void)GC_printf0("Emulating dirty bits with mprotect/signals\n"); +# else + (void)GC_printf0("Reading dirty bits from /proc\n"); +# endif +# endif + run_one_test(); + check_heap_stats(); + (void)fflush(stdout); +# ifdef LINT + /* Entry points we should be testing, but aren't. */ + /* Some can be tested by defining GC_DEBUG at the top of this file */ + /* This is a bit SunOS4 specific. */ + GC_noop(GC_expand_hp, GC_add_roots, GC_clear_roots, + GC_register_disappearing_link, + GC_register_finalizer_ignore_self, + GC_debug_register_displacement, + GC_print_obj, GC_debug_change_stubborn, + GC_debug_end_stubborn_change, GC_debug_malloc_uncollectable, + GC_debug_free, GC_debug_realloc, GC_generic_malloc_words_small, + GC_init, GC_make_closure, GC_debug_invoke_finalizer, + GC_page_was_ever_dirty, GC_is_fresh, + GC_malloc_ignore_off_page, GC_malloc_atomic_ignore_off_page, + GC_set_max_heap_size, GC_get_bytes_since_gc, + GC_pre_incr, GC_post_incr); +# endif +# ifdef MSWIN32 + GC_win32_free_heap(); +# endif + return(0); +} +# endif + +#ifdef WIN32_THREADS + +unsigned __stdcall thr_run_one_test(void *arg) +{ + run_one_test(); + return 0; +} + +#define NTEST 2 + +int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prev, LPSTR cmd, int n) +{ +# if NTEST > 0 + HANDLE h[NTEST]; +# endif + int i; + unsigned thread_id; +# if 0 + GC_enable_incremental(); +# endif + InitializeCriticalSection(&incr_cs); + (void) GC_set_warn_proc(warn_proc); +# if NTEST > 0 + for (i = 0; i < NTEST; i++) { + h[i] = (HANDLE)_beginthreadex(NULL, 0, thr_run_one_test, 0, 0, &thread_id); + if (h[i] == (HANDLE)-1) { + (void)GC_printf1("Thread creation failed %lu\n", (unsigned long)GetLastError()); + FAIL; + } + } +# endif /* NTEST > 0 */ + run_one_test(); +# if NTEST > 0 + for (i = 0; i < NTEST; i++) { + if (WaitForSingleObject(h[i], INFINITE) != WAIT_OBJECT_0) { + (void)GC_printf1("Thread wait failed %lu\n", (unsigned long)GetLastError()); + FAIL; + } + } +# endif /* NTEST > 0 */ + check_heap_stats(); + (void)fflush(stdout); + return(0); +} + +#endif /* WIN32_THREADS */ + + +#ifdef PCR +test() +{ + PCR_Th_T * th1; + PCR_Th_T * th2; + int code; + + n_tests = 0; + /* GC_enable_incremental(); */ + (void) GC_set_warn_proc(warn_proc); + th1 = PCR_Th_Fork(run_one_test, 0); + th2 = PCR_Th_Fork(run_one_test, 0); + run_one_test(); + if (PCR_Th_T_Join(th1, &code, NIL, PCR_allSigsBlocked, PCR_waitForever) + != PCR_ERes_okay || code != 0) { + (void)GC_printf0("Thread 1 failed\n"); + } + if (PCR_Th_T_Join(th2, &code, NIL, PCR_allSigsBlocked, PCR_waitForever) + != PCR_ERes_okay || code != 0) { + (void)GC_printf0("Thread 2 failed\n"); + } + check_heap_stats(); + (void)fflush(stdout); + return(0); +} +#endif + +#if defined(SOLARIS_THREADS) || defined(IRIX_THREADS) \ + || defined(HPUX_THREADS) || defined(LINUX_THREADS) +void * thr_run_one_test(void * arg) +{ + run_one_test(); + return(0); +} + +#ifdef GC_DEBUG +# define GC_free GC_debug_free +#endif + +#ifdef SOLARIS_THREADS +main() +{ + thread_t th1; + thread_t th2; + int code; + + n_tests = 0; + GC_INIT(); /* Only needed if gc is dynamic library. */ + GC_enable_incremental(); + (void) GC_set_warn_proc(warn_proc); + if (thr_keycreate(&fl_key, GC_free) != 0) { + (void)GC_printf1("Key creation failed %lu\n", (unsigned long)code); + FAIL; + } + if ((code = thr_create(0, 1024*1024, thr_run_one_test, 0, 0, &th1)) != 0) { + (void)GC_printf1("Thread 1 creation failed %lu\n", (unsigned long)code); + FAIL; + } + if ((code = thr_create(0, 1024*1024, thr_run_one_test, 0, THR_NEW_LWP, &th2)) != 0) { + (void)GC_printf1("Thread 2 creation failed %lu\n", (unsigned long)code); + FAIL; + } + run_one_test(); + if ((code = thr_join(th1, 0, 0)) != 0) { + (void)GC_printf1("Thread 1 failed %lu\n", (unsigned long)code); + FAIL; + } + if (thr_join(th2, 0, 0) != 0) { + (void)GC_printf1("Thread 2 failed %lu\n", (unsigned long)code); + FAIL; + } + check_heap_stats(); + (void)fflush(stdout); + return(0); +} +#else /* pthreads */ +main() +{ + pthread_t th1; + pthread_t th2; + pthread_attr_t attr; + int code; + +# ifdef IRIX_THREADS + /* Force a larger stack to be preallocated */ + /* Since the initial cant always grow later. */ + *((volatile char *)&code - 1024*1024) = 0; /* Require 1 Mb */ +# endif /* IRIX_THREADS */ + pthread_attr_init(&attr); +# if defined(IRIX_THREADS) || defined(HPUX_THREADS) + pthread_attr_setstacksize(&attr, 1000000); +# endif + n_tests = 0; +# ifdef MPROTECT_VDB + GC_enable_incremental(); + (void) GC_printf0("Switched to incremental mode\n"); + (void) GC_printf0("Emulating dirty bits with mprotect/signals\n"); +# endif + (void) GC_set_warn_proc(warn_proc); + if ((code = pthread_key_create(&fl_key, 0)) != 0) { + (void)GC_printf1("Key creation failed %lu\n", (unsigned long)code); + FAIL; + } + if ((code = pthread_create(&th1, &attr, thr_run_one_test, 0)) != 0) { + (void)GC_printf1("Thread 1 creation failed %lu\n", (unsigned long)code); + FAIL; + } + if ((code = pthread_create(&th2, &attr, thr_run_one_test, 0)) != 0) { + (void)GC_printf1("Thread 2 creation failed %lu\n", (unsigned long)code); + FAIL; + } + run_one_test(); + if ((code = pthread_join(th1, 0)) != 0) { + (void)GC_printf1("Thread 1 failed %lu\n", (unsigned long)code); + FAIL; + } + if (pthread_join(th2, 0) != 0) { + (void)GC_printf1("Thread 2 failed %lu\n", (unsigned long)code); + FAIL; + } + check_heap_stats(); + (void)fflush(stdout); + pthread_attr_destroy(&attr); + GC_printf1("Completed %d collections\n", GC_gc_no); + return(0); +} +#endif /* pthreads */ +#endif /* SOLARIS_THREADS || IRIX_THREADS || LINUX_THREADS || HPUX_THREADS */ diff --git a/boehm-gc/test_cpp.cc b/boehm-gc/test_cpp.cc new file mode 100644 index 00000000000..0d45077658f --- /dev/null +++ b/boehm-gc/test_cpp.cc @@ -0,0 +1,271 @@ +/**************************************************************************** +Copyright (c) 1994 by Xerox Corporation. All rights reserved. + +THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED +OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + +Permission is hereby granted to use or copy this program for any +purpose, provided the above notices are retained on all copies. +Permission to modify the code and to distribute modified code is +granted, provided the above notices are retained, and a notice that +the code was modified is included with the above copyright notice. +**************************************************************************** +Last modified on Mon Jul 10 21:06:03 PDT 1995 by ellis + modified on December 20, 1994 7:27 pm PST by boehm + +usage: test_cpp number-of-iterations + +This program tries to test the specific C++ functionality provided by +gc_c++.h that isn't tested by the more general test routines of the +collector. + +A recommended value for number-of-iterations is 10, which will take a +few minutes to complete. + +***************************************************************************/ + +#include "gc_cpp.h" +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#ifndef __GNUC__ +# include "gc_alloc.h" +#endif +extern "C" { +#include "gc_priv.h" +} +#ifdef MSWIN32 +# include <windows.h> +#endif +#ifdef GC_NAME_CONFLICT +# define USE_GC UseGC + struct foo * GC; +#else +# define USE_GC GC +#endif + + +#define my_assert( e ) \ + if (! (e)) { \ + GC_printf1( "Assertion failure in " __FILE__ ", line %d: " #e "\n", \ + __LINE__ ); \ + exit( 1 ); } + + +class A {public: + /* An uncollectable class. */ + + A( int iArg ): i( iArg ) {} + void Test( int iArg ) { + my_assert( i == iArg );} + int i;}; + + +class B: public gc, public A {public: + /* A collectable class. */ + + B( int j ): A( j ) {} + ~B() { + my_assert( deleting );} + static void Deleting( int on ) { + deleting = on;} + static int deleting;}; + +int B::deleting = 0; + + +class C: public gc_cleanup, public A {public: + /* A collectable class with cleanup and virtual multiple inheritance. */ + + C( int levelArg ): A( levelArg ), level( levelArg ) { + nAllocated++; + if (level > 0) { + left = new C( level - 1 ); + right = new C( level - 1 );} + else { + left = right = 0;}} + ~C() { + this->A::Test( level ); + nFreed++; + my_assert( level == 0 ? + left == 0 && right == 0 : + level == left->level + 1 && level == right->level + 1 ); + left = right = 0; + level = -123456;} + static void Test() { + my_assert( nFreed <= nAllocated && nFreed >= .8 * nAllocated );} + + static int nFreed; + static int nAllocated; + int level; + C* left; + C* right;}; + +int C::nFreed = 0; +int C::nAllocated = 0; + + +class D: public gc {public: + /* A collectable class with a static member function to be used as + an explicit clean-up function supplied to ::new. */ + + D( int iArg ): i( iArg ) { + nAllocated++;} + static void CleanUp( void* obj, void* data ) { + D* self = (D*) obj; + nFreed++; + my_assert( self->i == (int) (long) data );} + static void Test() { + my_assert( nFreed >= .8 * nAllocated );} + + int i; + static int nFreed; + static int nAllocated;}; + +int D::nFreed = 0; +int D::nAllocated = 0; + + +class E: public gc_cleanup {public: + /* A collectable class with clean-up for use by F. */ + + E() { + nAllocated++;} + ~E() { + nFreed++;} + + static int nFreed; + static int nAllocated;}; + +int E::nFreed = 0; +int E::nAllocated = 0; + + +class F: public E {public: + /* A collectable class with clean-up, a base with clean-up, and a + member with clean-up. */ + + F() { + nAllocated++;} + ~F() { + nFreed++;} + static void Test() { + my_assert( nFreed >= .8 * nAllocated ); + my_assert( 2 * nFreed == E::nFreed );} + + E e; + static int nFreed; + static int nAllocated;}; + +int F::nFreed = 0; +int F::nAllocated = 0; + + +long Disguise( void* p ) { + return ~ (long) p;} + +void* Undisguise( long i ) { + return (void*) ~ i;} + + +#ifdef MSWIN32 +int APIENTRY WinMain( + HINSTANCE instance, HINSTANCE prev, LPSTR cmd, int cmdShow ) +{ + int argc; + char* argv[ 3 ]; + + for (argc = 1; argc < sizeof( argv ) / sizeof( argv[ 0 ] ); argc++) { + argv[ argc ] = strtok( argc == 1 ? cmd : 0, " \t" ); + if (0 == argv[ argc ]) break;} + +#else +# ifdef MACOS + int main() { +# else + int main( int argc, char* argv[] ) { +# endif +#endif + +# if defined(MACOS) // MacOS + char* argv_[] = {"test_cpp", "10"}; // doesn't + argv = argv_; // have a + argc = sizeof(argv_)/sizeof(argv_[0]); // commandline +# endif + int i, iters, n; +# if !defined(__GNUC__) && !defined(MACOS) + int *x = (int *)alloc::allocate(sizeof(int)); + + *x = 29; + x -= 3; +# endif + if (argc != 2 || (0 >= (n = atoi( argv[ 1 ] )))) { + GC_printf0( "usage: test_cpp number-of-iterations\n" ); + exit( 1 );} + + for (iters = 1; iters <= n; iters++) { + GC_printf1( "Starting iteration %d\n", iters ); + + /* Allocate some uncollectable As and disguise their pointers. + Later we'll check to see if the objects are still there. We're + checking to make sure these objects really are uncollectable. */ + long as[ 1000 ]; + long bs[ 1000 ]; + for (i = 0; i < 1000; i++) { + as[ i ] = Disguise( new (NoGC) A( i ) ); + bs[ i ] = Disguise( new (NoGC) B( i ) );} + + /* Allocate a fair number of finalizable Cs, Ds, and Fs. + Later we'll check to make sure they've gone away. */ + for (i = 0; i < 1000; i++) { + C* c = new C( 2 ); + C c1( 2 ); /* stack allocation should work too */ + D* d = ::new (USE_GC, D::CleanUp, (void*) i) D( i ); + F* f = new F; + if (0 == i % 10) delete c;} + + /* Allocate a very large number of collectable As and Bs and + drop the references to them immediately, forcing many + collections. */ + for (i = 0; i < 1000000; i++) { + A* a = new (USE_GC) A( i ); + B* b = new B( i ); + b = new (USE_GC) B( i ); + if (0 == i % 10) { + B::Deleting( 1 ); + delete b; + B::Deleting( 0 );} +# ifdef FINALIZE_ON_DEMAND + GC_invoke_finalizers(); +# endif + } + + /* Make sure the uncollectable As and Bs are still there. */ + for (i = 0; i < 1000; i++) { + A* a = (A*) Undisguise( as[ i ] ); + B* b = (B*) Undisguise( bs[ i ] ); + a->Test( i ); + delete a; + b->Test( i ); + B::Deleting( 1 ); + delete b; + B::Deleting( 0 ); +# ifdef FINALIZE_ON_DEMAND + GC_invoke_finalizers(); +# endif + + } + + /* Make sure most of the finalizable Cs, Ds, and Fs have + gone away. */ + C::Test(); + D::Test(); + F::Test();} + +# if !defined(__GNUC__) && !defined(MACOS) + my_assert (29 == x[3]); +# endif + GC_printf0( "The test appears to have succeeded.\n" ); + return( 0 );} + + diff --git a/boehm-gc/weakpointer.h b/boehm-gc/weakpointer.h new file mode 100644 index 00000000000..84906b00a68 --- /dev/null +++ b/boehm-gc/weakpointer.h @@ -0,0 +1,221 @@ +#ifndef _weakpointer_h_ +#define _weakpointer_h_ + +/**************************************************************************** + +WeakPointer and CleanUp + + Copyright (c) 1991 by Xerox Corporation. All rights reserved. + + THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + + Permission is hereby granted to copy this code for any purpose, + provided the above notices are retained on all copies. + + Last modified on Mon Jul 17 18:16:01 PDT 1995 by ellis + +****************************************************************************/ + +/**************************************************************************** + +WeakPointer + +A weak pointer is a pointer to a heap-allocated object that doesn't +prevent the object from being garbage collected. Weak pointers can be +used to track which objects haven't yet been reclaimed by the +collector. A weak pointer is deactivated when the collector discovers +its referent object is unreachable by normal pointers (reachability +and deactivation are defined more precisely below). A deactivated weak +pointer remains deactivated forever. + +****************************************************************************/ + + +template< class T > class WeakPointer { +public: + +WeakPointer( T* t = 0 ) + /* Constructs a weak pointer for *t. t may be null. It is an error + if t is non-null and *t is not a collected object. */ + {impl = _WeakPointer_New( t );} + +T* Pointer() + /* wp.Pointer() returns a pointer to the referent object of wp or + null if wp has been deactivated (because its referent object + has been discovered unreachable by the collector). */ + {return (T*) _WeakPointer_Pointer( this->impl );} + +int operator==( WeakPointer< T > wp2 ) + /* Given weak pointers wp1 and wp2, if wp1 == wp2, then wp1 and + wp2 refer to the same object. If wp1 != wp2, then either wp1 + and wp2 don't refer to the same object, or if they do, one or + both of them has been deactivated. (Note: If objects t1 and t2 + are never made reachable by their clean-up functions, then + WeakPointer<T>(t1) == WeakPointer<T>(t2) if and only t1 == t2.) */ + {return _WeakPointer_Equal( this->impl, wp2.impl );} + +int Hash() + /* Returns a hash code suitable for use by multiplicative- and + division-based hash tables. If wp1 == wp2, then wp1.Hash() == + wp2.Hash(). */ + {return _WeakPointer_Hash( this->impl );} + +private: +void* impl; +}; + +/***************************************************************************** + +CleanUp + +A garbage-collected object can have an associated clean-up function +that will be invoked some time after the collector discovers the +object is unreachable via normal pointers. Clean-up functions can be +used to release resources such as open-file handles or window handles +when their containing objects become unreachable. If a C++ object has +a non-empty explicit destructor (i.e. it contains programmer-written +code), the destructor will be automatically registered as the object's +initial clean-up function. + +There is no guarantee that the collector will detect every unreachable +object (though it will find almost all of them). Clients should not +rely on clean-up to cause some action to occur immediately -- clean-up +is only a mechanism for improving resource usage. + +Every object with a clean-up function also has a clean-up queue. When +the collector finds the object is unreachable, it enqueues it on its +queue. The clean-up function is applied when the object is removed +from the queue. By default, objects are enqueued on the garbage +collector's queue, and the collector removes all objects from its +queue after each collection. If a client supplies another queue for +objects, it is his responsibility to remove objects (and cause their +functions to be called) by polling it periodically. + +Clean-up queues allow clean-up functions accessing global data to +synchronize with the main program. Garbage collection can occur at any +time, and clean-ups invoked by the collector might access data in an +inconsistent state. A client can control this by defining an explicit +queue for objects and polling it at safe points. + +The following definitions are used by the specification below: + +Given a pointer t to a collected object, the base object BO(t) is the +value returned by new when it created the object. (Because of multiple +inheritance, t and BO(t) may not be the same address.) + +A weak pointer wp references an object *t if BO(wp.Pointer()) == +BO(t). + +***************************************************************************/ + +template< class T, class Data > class CleanUp { +public: + +static void Set( T* t, void c( Data* d, T* t ), Data* d = 0 ) + /* Sets the clean-up function of object BO(t) to be <c, d>, + replacing any previously defined clean-up function for BO(t); c + and d can be null, but t cannot. Sets the clean-up queue for + BO(t) to be the collector's queue. When t is removed from its + clean-up queue, its clean-up will be applied by calling c(d, + t). It is an error if *t is not a collected object. */ + {_CleanUp_Set( t, c, d );} + +static void Call( T* t ) + /* Sets the new clean-up function for BO(t) to be null and, if the + old one is non-null, calls it immediately, even if BO(t) is + still reachable. Deactivates any weak pointers to BO(t). */ + {_CleanUp_Call( t );} + +class Queue {public: + Queue() + /* Constructs a new queue. */ + {this->head = _CleanUp_Queue_NewHead();} + + void Set( T* t ) + /* q.Set(t) sets the clean-up queue of BO(t) to be q. */ + {_CleanUp_Queue_Set( this->head, t );} + + int Call() + /* If q is non-empty, q.Call() removes the first object and + calls its clean-up function; does nothing if q is + empty. Returns true if there are more objects in the + queue. */ + {return _CleanUp_Queue_Call( this->head );} + + private: + void* head; + }; +}; + +/********************************************************************** + +Reachability and Clean-up + +An object O is reachable if it can be reached via a non-empty path of +normal pointers from the registers, stacks, global variables, or an +object with a non-null clean-up function (including O itself), +ignoring pointers from an object to itself. + +This definition of reachability ensures that if object B is accessible +from object A (and not vice versa) and if both A and B have clean-up +functions, then A will always be cleaned up before B. Note that as +long as an object with a clean-up function is contained in a cycle of +pointers, it will always be reachable and will never be cleaned up or +collected. + +When the collector finds an unreachable object with a null clean-up +function, it atomically deactivates all weak pointers referencing the +object and recycles its storage. If object B is accessible from object +A via a path of normal pointers, A will be discovered unreachable no +later than B, and a weak pointer to A will be deactivated no later +than a weak pointer to B. + +When the collector finds an unreachable object with a non-null +clean-up function, the collector atomically deactivates all weak +pointers referencing the object, redefines its clean-up function to be +null, and enqueues it on its clean-up queue. The object then becomes +reachable again and remains reachable at least until its clean-up +function executes. + +The clean-up function is assured that its argument is the only +accessible pointer to the object. Nothing prevents the function from +redefining the object's clean-up function or making the object +reachable again (for example, by storing the pointer in a global +variable). + +If the clean-up function does not make its object reachable again and +does not redefine its clean-up function, then the object will be +collected by a subsequent collection (because the object remains +unreachable and now has a null clean-up function). If the clean-up +function does make its object reachable again and a clean-up function +is subsequently redefined for the object, then the new clean-up +function will be invoked the next time the collector finds the object +unreachable. + +Note that a destructor for a collected object cannot safely redefine a +clean-up function for its object, since after the destructor executes, +the object has been destroyed into "raw memory". (In most +implementations, destroying an object mutates its vtbl.) + +Finally, note that calling delete t on a collected object first +deactivates any weak pointers to t and then invokes its clean-up +function (destructor). + +**********************************************************************/ + +extern "C" { + void* _WeakPointer_New( void* t ); + void* _WeakPointer_Pointer( void* wp ); + int _WeakPointer_Equal( void* wp1, void* wp2 ); + int _WeakPointer_Hash( void* wp ); + void _CleanUp_Set( void* t, void (*c)( void* d, void* t ), void* d ); + void _CleanUp_Call( void* t ); + void* _CleanUp_Queue_NewHead (); + void _CleanUp_Queue_Set( void* h, void* t ); + int _CleanUp_Queue_Call( void* h ); +} + +#endif /* _weakpointer_h_ */ + + |