Import the asan runtime library into GCC tree

This patch imports the runtime library in the GCC tree, ensures that
-lasan is passed to the linker when -faddress-sanitizer is used and
sets up the build system accordingly.

ChangeLog:

	* configure.ac: Add libsanitizer to target_libraries.
	* Makefile.def: Ditto.
	* configure: Regenerate.
	* Makefile.in: Regenerate.
	* libsanitizer: New directory for asan runtime.  Contains an empty
	tsan directory.

gcc/ChangeLog:

	* gcc.c (LINK_COMMAND_SPEC): Add -laddress-sanitizer to link
	command if -faddress-sanitizer is on.

libsanitizer:

	Initial checkin: migrate asan runtime from llvm.

git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@193441 138bc75d-0d04-0410-961f-82ee72b054a4

2 files changed, 263 insertions, 0 deletions

diff --git a/libsanitizer/include/sanitizer/asan_interface.h b/libsanitizer/include/sanitizer/asan_interface.h
new file mode 100644
index 00000000000..c7d57d604bf
--- /dev/null
+++ b/libsanitizer/include/sanitizer/asan_interface.h
@@ -0,0 +1,197 @@
+//===-- sanitizer/asan_interface.h ------------------------------*- C++ -*-===//
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// This header can be included by the instrumented program to fetch
+// data (mostly allocator statistics) from ASan runtime library.
+//===----------------------------------------------------------------------===//
+#ifndef SANITIZER_ASAN_INTERFACE_H
+#define SANITIZER_ASAN_INTERFACE_H
+
+#include <sanitizer/common_interface_defs.h>
+
+// ----------- ATTENTION -------------
+// This header should NOT include any other headers from ASan runtime.
+// All functions in this header are extern "C" and start with __asan_.
+
+using __sanitizer::uptr;
+
+extern "C" {
+  // This function should be called at the very beginning of the process,
+  // before any instrumented code is executed and before any call to malloc.
+  void __asan_init() SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // This function should be called by the instrumented code.
+  // 'addr' is the address of a global variable called 'name' of 'size' bytes.
+  void __asan_register_global(uptr addr, uptr size, const char *name)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // This structure describes an instrumented global variable.
+  struct __asan_global {
+    uptr beg;                // The address of the global.
+    uptr size;               // The original size of the global.
+    uptr size_with_redzone;  // The size with the redzone.
+    const char *name;        // Name as a C string.
+    uptr has_dynamic_init;   // Non-zero if the global has dynamic initializer.
+  };
+
+  // These two functions should be called by the instrumented code.
+  // 'globals' is an array of structures describing 'n' globals.
+  void __asan_register_globals(__asan_global *globals, uptr n)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+  void __asan_unregister_globals(__asan_global *globals, uptr n)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // These two functions should be called before and after dynamic initializers
+  // run, respectively.  They should be called with parameters describing all
+  // dynamically initialized globals defined in the calling TU.
+  void __asan_before_dynamic_init(uptr first_addr, uptr last_addr)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+  void __asan_after_dynamic_init()
+      SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // These two functions are used by the instrumented code in the
+  // use-after-return mode. __asan_stack_malloc allocates size bytes of
+  // fake stack and __asan_stack_free poisons it. real_stack is a pointer to
+  // the real stack region.
+  uptr __asan_stack_malloc(uptr size, uptr real_stack)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+  void __asan_stack_free(uptr ptr, uptr size, uptr real_stack)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // Marks memory region [addr, addr+size) as unaddressable.
+  // This memory must be previously allocated by the user program. Accessing
+  // addresses in this region from instrumented code is forbidden until
+  // this region is unpoisoned. This function is not guaranteed to poison
+  // the whole region - it may poison only subregion of [addr, addr+size) due
+  // to ASan alignment restrictions.
+  // Method is NOT thread-safe in the sense that no two threads can
+  // (un)poison memory in the same memory region simultaneously.
+  void __asan_poison_memory_region(void const volatile *addr, uptr size)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+  // Marks memory region [addr, addr+size) as addressable.
+  // This memory must be previously allocated by the user program. Accessing
+  // addresses in this region is allowed until this region is poisoned again.
+  // This function may unpoison a superregion of [addr, addr+size) due to
+  // ASan alignment restrictions.
+  // Method is NOT thread-safe in the sense that no two threads can
+  // (un)poison memory in the same memory region simultaneously.
+  void __asan_unpoison_memory_region(void const volatile *addr, uptr size)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // Performs cleanup before a NoReturn function. Must be called before things
+  // like _exit and execl to avoid false positives on stack.
+  void __asan_handle_no_return() SANITIZER_INTERFACE_ATTRIBUTE;
+
+// User code should use macro instead of functions.
+#if __has_feature(address_sanitizer)
+#define ASAN_POISON_MEMORY_REGION(addr, size) \
+  __asan_poison_memory_region((addr), (size))
+#define ASAN_UNPOISON_MEMORY_REGION(addr, size) \
+  __asan_unpoison_memory_region((addr), (size))
+#else
+#define ASAN_POISON_MEMORY_REGION(addr, size) \
+  ((void)(addr), (void)(size))
+#define ASAN_UNPOISON_MEMORY_REGION(addr, size) \
+  ((void)(addr), (void)(size))
+#endif
+
+  // Returns true iff addr is poisoned (i.e. 1-byte read/write access to this
+  // address will result in error report from AddressSanitizer).
+  bool __asan_address_is_poisoned(void const volatile *addr)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // This is an internal function that is called to report an error.
+  // However it is still a part of the interface because users may want to
+  // set a breakpoint on this function in a debugger.
+  void __asan_report_error(uptr pc, uptr bp, uptr sp,
+                           uptr addr, bool is_write, uptr access_size)
+    SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // Sets the exit code to use when reporting an error.
+  // Returns the old value.
+  int __asan_set_error_exit_code(int exit_code)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // Sets the callback to be called right before death on error.
+  // Passing 0 will unset the callback.
+  void __asan_set_death_callback(void (*callback)(void))
+      SANITIZER_INTERFACE_ATTRIBUTE;
+
+  void __asan_set_error_report_callback(void (*callback)(const char*))
+      SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // User may provide function that would be called right when ASan detects
+  // an error. This can be used to notice cases when ASan detects an error, but
+  // the program crashes before ASan report is printed.
+  void __asan_on_error()
+      SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // User may provide its own implementation for symbolization function.
+  // It should print the description of instruction at address "pc" to
+  // "out_buffer". Description should be at most "out_size" bytes long.
+  // User-specified function should return true if symbolization was
+  // successful.
+  bool __asan_symbolize(const void *pc, char *out_buffer, int out_size)
+      SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // Returns the estimated number of bytes that will be reserved by allocator
+  // for request of "size" bytes. If ASan allocator can't allocate that much
+  // memory, returns the maximal possible allocation size, otherwise returns
+  // "size".
+  uptr __asan_get_estimated_allocated_size(uptr size)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+  // Returns true if p was returned by the ASan allocator and
+  // is not yet freed.
+  bool __asan_get_ownership(const void *p)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+  // Returns the number of bytes reserved for the pointer p.
+  // Requires (get_ownership(p) == true) or (p == 0).
+  uptr __asan_get_allocated_size(const void *p)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+  // Number of bytes, allocated and not yet freed by the application.
+  uptr __asan_get_current_allocated_bytes()
+      SANITIZER_INTERFACE_ATTRIBUTE;
+  // Number of bytes, mmaped by asan allocator to fulfill allocation requests.
+  // Generally, for request of X bytes, allocator can reserve and add to free
+  // lists a large number of chunks of size X to use them for future requests.
+  // All these chunks count toward the heap size. Currently, allocator never
+  // releases memory to OS (instead, it just puts freed chunks to free lists).
+  uptr __asan_get_heap_size()
+      SANITIZER_INTERFACE_ATTRIBUTE;
+  // Number of bytes, mmaped by asan allocator, which can be used to fulfill
+  // allocation requests. When a user program frees memory chunk, it can first
+  // fall into quarantine and will count toward __asan_get_free_bytes() later.
+  uptr __asan_get_free_bytes()
+      SANITIZER_INTERFACE_ATTRIBUTE;
+  // Number of bytes in unmapped pages, that are released to OS. Currently,
+  // always returns 0.
+  uptr __asan_get_unmapped_bytes()
+      SANITIZER_INTERFACE_ATTRIBUTE;
+  // Prints accumulated stats to stderr. Used for debugging.
+  void __asan_print_accumulated_stats()
+      SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // This function may be overriden by user to provide a string containing
+  // ASan runtime options. See asan_flags.h for details.
+  const char* __asan_default_options()
+      SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE;
+
+  // Malloc hooks that may be overriden by user.
+  // __asan_malloc_hook(ptr, size) is called immediately after
+  //   allocation of "size" bytes, which returned "ptr".
+  // __asan_free_hook(ptr) is called immediately before
+  //   deallocation of "ptr".
+  // If user doesn't provide implementations of these hooks, they are no-op.
+  void __asan_malloc_hook(void *ptr, uptr size)
+      SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE;
+  void __asan_free_hook(void *ptr)
+      SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE;
+}  // extern "C"
+
+#endif  // SANITIZER_ASAN_INTERFACE_H
diff --git a/libsanitizer/include/sanitizer/common_interface_defs.h b/libsanitizer/include/sanitizer/common_interface_defs.h
new file mode 100644
index 00000000000..4ac7609c675
--- /dev/null
+++ b/libsanitizer/include/sanitizer/common_interface_defs.h
@@ -0,0 +1,66 @@
+//===-- sanitizer/common_interface_defs.h -----------------------*- C++ -*-===//
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is shared between AddressSanitizer and ThreadSanitizer.
+// It contains basic macro and types.
+// NOTE: This file may be included into user code.
+//===----------------------------------------------------------------------===//
+
+#ifndef SANITIZER_COMMON_INTERFACE_DEFS_H
+#define SANITIZER_COMMON_INTERFACE_DEFS_H
+
+// ----------- ATTENTION -------------
+// This header should NOT include any other headers to avoid portability issues.
+
+#if defined(_WIN32)
+// FIXME find out what we need on Windows. __declspec(dllexport) ?
+# define SANITIZER_INTERFACE_ATTRIBUTE
+# define SANITIZER_WEAK_ATTRIBUTE
+#elif defined(SANITIZER_GO)
+# define SANITIZER_INTERFACE_ATTRIBUTE
+# define SANITIZER_WEAK_ATTRIBUTE
+#else
+# define SANITIZER_INTERFACE_ATTRIBUTE __attribute__((visibility("default")))
+# define SANITIZER_WEAK_ATTRIBUTE  __attribute__((weak))
+#endif
+
+// __has_feature
+#if !defined(__has_feature)
+# define __has_feature(x) 0
+#endif
+
+// For portability reasons we do not include stddef.h, stdint.h or any other
+// system header, but we do need some basic types that are not defined
+// in a portable way by the language itself.
+namespace __sanitizer {
+
+#if defined(_WIN64)
+// 64-bit Windows uses LLP64 data model.
+typedef unsigned long long uptr;  // NOLINT
+typedef signed   long long sptr;  // NOLINT
+#else
+typedef unsigned long uptr;  // NOLINT
+typedef signed   long sptr;  // NOLINT
+#endif  // defined(_WIN64)
+typedef unsigned char u8;
+typedef unsigned short u16;  // NOLINT
+typedef unsigned int u32;
+typedef unsigned long long u64;  // NOLINT
+typedef signed   char s8;
+typedef signed   short s16;  // NOLINT
+typedef signed   int s32;
+typedef signed   long long s64;  // NOLINT
+
+}  // namespace __sanitizer
+
+extern "C" {
+  // Tell the tools to write their reports to "path.<pid>" instead of stderr.
+  void __sanitizer_set_report_path(const char *path)
+      SANITIZER_INTERFACE_ATTRIBUTE;
+}  // extern "C"
+
+#endif  // SANITIZER_COMMON_INTERFACE_DEFS_H