diff options
Diffstat (limited to 'gcc/doc/extend.texi')
| -rw-r--r-- | gcc/doc/extend.texi | 113 |
1 files changed, 59 insertions, 54 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index eb84408ce7c..ca655153067 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -30,8 +30,8 @@ extensions, accepted by GCC in C90 mode and in C++. * Constructing Calls:: Dispatching a call to another function. * Typeof:: @code{typeof}: referring to the type of an expression. * Conditionals:: Omitting the middle operand of a @samp{?:} expression. -* Long Long:: Double-word integers---@code{long long int}. * __int128:: 128-bit integers---@code{__int128}. +* Long Long:: Double-word integers---@code{long long int}. * Complex:: Data types for complex numbers. * Floating Types:: Additional Floating Types. * Half-Precision:: Half-Precision Floating Point. @@ -40,8 +40,8 @@ extensions, accepted by GCC in C90 mode and in C++. * Fixed-Point:: Fixed-Point Types. * Named Address Spaces::Named address spaces. * Zero Length:: Zero-length arrays. -* Variable Length:: Arrays whose length is computed at run time. * Empty Structures:: Structures with no members. +* Variable Length:: Arrays whose length is computed at run time. * Variadic Macros:: Macros with a variable number of arguments. * Escaped Newlines:: Slightly looser rules for escaped newlines. * Subscripting:: Any array can be subscripted, even if not an lvalue. @@ -50,8 +50,8 @@ extensions, accepted by GCC in C90 mode and in C++. * Compound Literals:: Compound literals give structures, unions or arrays as values. * Designated Inits:: Labeling elements of initializers. -* Cast to Union:: Casting to union type from any member of the union. * Case Ranges:: `case 1 ... 9' and such. +* Cast to Union:: Casting to union type from any member of the union. * Mixed Declarations:: Mixing declarations and code. * Function Attributes:: Declaring that functions have no side effects, or that they can never return. @@ -2133,7 +2133,8 @@ attributes are currently defined for functions on all targets: @code{weak}, @code{malloc}, @code{alias}, @code{ifunc}, @code{warn_unused_result}, @code{nonnull}, @code{gnu_inline}, @code{externally_visible}, @code{hot}, @code{cold}, @code{artificial}, -@code{no_address_safety_analysis}, @code{error} and @code{warning}. +@code{no_sanitize_address}, @code{no_address_safety_analysis}, +@code{error} and @code{warning}. Several other attributes are defined for functions on particular target systems. Other attributes, including @code{section} are supported for variables declarations (@pxref{Variable Attributes}) @@ -3432,11 +3433,15 @@ with computed goto or @code{asm goto}. The @code{cold} attribute on labels is not implemented in GCC versions earlier than 4.8. -@item no_address_safety_analysis -@cindex @code{no_address_safety_analysis} function attribute -The @code{no_address_safety_analysis} attribute on functions is used +@item no_sanitize_address +@itemx no_address_safety_analysis +@cindex @code{no_sanitize_address} function attribute +The @code{no_sanitize_address} attribute on functions is used to inform the compiler that it should not instrument memory accesses in the function when compiling with the @option{-fsanitize=address} option. +The @code{no_address_safety_analysis} is a deprecated alias of the +@code{no_sanitize_address} attribute, new code should use +@code{no_sanitize_address}. @item regparm (@var{number}) @cindex @code{regparm} attribute @@ -11653,6 +11658,18 @@ else @end smallexample @end table +@node Other MIPS Built-in Functions +@subsection Other MIPS Built-in Functions + +GCC provides other MIPS-specific built-in functions: + +@table @code +@item void __builtin_mips_cache (int @var{op}, const volatile void *@var{addr}) +Insert a @samp{cache} instruction with operands @var{op} and @var{addr}. +GCC defines the preprocessor macro @code{___GCC_HAVE_BUILTIN_MIPS_CACHE} +when this function is available. +@end table + @node picoChip Built-in Functions @subsection picoChip Built-in Functions @@ -11689,18 +11706,6 @@ implementing assertions. @end table -@node Other MIPS Built-in Functions -@subsection Other MIPS Built-in Functions - -GCC provides other MIPS-specific built-in functions: - -@table @code -@item void __builtin_mips_cache (int @var{op}, const volatile void *@var{addr}) -Insert a @samp{cache} instruction with operands @var{op} and @var{addr}. -GCC defines the preprocessor macro @code{___GCC_HAVE_BUILTIN_MIPS_CACHE} -when this function is available. -@end table - @node PowerPC Built-in Functions @subsection PowerPC Built-in Functions @@ -13791,41 +13796,6 @@ if the VSX instruction set is available. The @samp{vec_vsx_ld} and @samp{vec_vsx_st} built-in functions always generate the VSX @samp{LXVD2X}, @samp{LXVW4X}, @samp{STXVD2X}, and @samp{STXVW4X} instructions. -@node SH Built-in Functions -@subsection SH Built-in Functions -The following built-in functions are supported on the SH1, SH2, SH3 and SH4 -families of processors: - -@deftypefn {Built-in Function} {void} __builtin_set_thread_pointer (void *@var{ptr}) -Sets the @samp{GBR} register to the specified value @var{ptr}. This is usually -used by system code that manages threads and execution contexts. The compiler -normally does not generate code that modifies the contents of @samp{GBR} and -thus the value is preserved across function calls. Changing the @samp{GBR} -value in user code must be done with caution, since the compiler might use -@samp{GBR} in order to access thread local variables. - -@end deftypefn - -@deftypefn {Built-in Function} {void *} __builtin_thread_pointer (void) -Returns the value that is currently set in the @samp{GBR} register. -Memory loads and stores that use the thread pointer as a base address are -turned into @samp{GBR} based displacement loads and stores, if possible. -For example: -@smallexample -struct my_tcb -@{ - int a, b, c, d, e; -@}; - -int get_tcb_value (void) -@{ - // Generate @samp{mov.l @@(8,gbr),r0} instruction - return ((my_tcb*)__builtin_thread_pointer ())->c; -@} - -@end smallexample -@end deftypefn - @node RX Built-in Functions @subsection RX Built-in Functions GCC supports some of the RX instructions which cannot be expressed in @@ -13941,6 +13911,41 @@ bit in the processor status word. Generates the @code{wait} machine instruction. @end deftypefn +@node SH Built-in Functions +@subsection SH Built-in Functions +The following built-in functions are supported on the SH1, SH2, SH3 and SH4 +families of processors: + +@deftypefn {Built-in Function} {void} __builtin_set_thread_pointer (void *@var{ptr}) +Sets the @samp{GBR} register to the specified value @var{ptr}. This is usually +used by system code that manages threads and execution contexts. The compiler +normally does not generate code that modifies the contents of @samp{GBR} and +thus the value is preserved across function calls. Changing the @samp{GBR} +value in user code must be done with caution, since the compiler might use +@samp{GBR} in order to access thread local variables. + +@end deftypefn + +@deftypefn {Built-in Function} {void *} __builtin_thread_pointer (void) +Returns the value that is currently set in the @samp{GBR} register. +Memory loads and stores that use the thread pointer as a base address are +turned into @samp{GBR} based displacement loads and stores, if possible. +For example: +@smallexample +struct my_tcb +@{ + int a, b, c, d, e; +@}; + +int get_tcb_value (void) +@{ + // Generate @samp{mov.l @@(8,gbr),r0} instruction + return ((my_tcb*)__builtin_thread_pointer ())->c; +@} + +@end smallexample +@end deftypefn + @node SPARC VIS Built-in Functions @subsection SPARC VIS Built-in Functions |