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293 lines
12 KiB
293 lines
12 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_COMPILER_ATTRIBUTES_H |
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#define __LINUX_COMPILER_ATTRIBUTES_H |
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/* |
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* The attributes in this file are unconditionally defined and they directly |
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* map to compiler attribute(s), unless one of the compilers does not support |
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* the attribute. In that case, __has_attribute is used to check for support |
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* and the reason is stated in its comment ("Optional: ..."). |
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* |
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* Any other "attributes" (i.e. those that depend on a configuration option, |
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* on a compiler, on an architecture, on plugins, on other attributes...) |
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* should be defined elsewhere (e.g. compiler_types.h or compiler-*.h). |
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* The intention is to keep this file as simple as possible, as well as |
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* compiler- and version-agnostic (e.g. avoiding GCC_VERSION checks). |
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* |
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* This file is meant to be sorted (by actual attribute name, |
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* not by #define identifier). Use the __attribute__((__name__)) syntax |
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* (i.e. with underscores) to avoid future collisions with other macros. |
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* Provide links to the documentation of each supported compiler, if it exists. |
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*/ |
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/* |
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* __has_attribute is supported on gcc >= 5, clang >= 2.9 and icc >= 17. |
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* In the meantime, to support gcc < 5, we implement __has_attribute |
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* by hand. |
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*/ |
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#ifndef __has_attribute |
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# define __has_attribute(x) __GCC4_has_attribute_##x |
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# define __GCC4_has_attribute___assume_aligned__ (__GNUC_MINOR__ >= 9) |
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# define __GCC4_has_attribute___copy__ 0 |
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# define __GCC4_has_attribute___designated_init__ 0 |
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# define __GCC4_has_attribute___externally_visible__ 1 |
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# define __GCC4_has_attribute___no_caller_saved_registers__ 0 |
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# define __GCC4_has_attribute___noclone__ 1 |
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# define __GCC4_has_attribute___nonstring__ 0 |
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# define __GCC4_has_attribute___no_sanitize_address__ (__GNUC_MINOR__ >= 8) |
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# define __GCC4_has_attribute___no_sanitize_undefined__ (__GNUC_MINOR__ >= 9) |
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# define __GCC4_has_attribute___fallthrough__ 0 |
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#endif |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-alias-function-attribute |
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*/ |
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#define __alias(symbol) __attribute__((__alias__(#symbol))) |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-aligned-function-attribute |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-aligned-type-attribute |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-aligned-variable-attribute |
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*/ |
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#define __aligned(x) __attribute__((__aligned__(x))) |
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#define __aligned_largest __attribute__((__aligned__)) |
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/* |
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* Note: users of __always_inline currently do not write "inline" themselves, |
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* which seems to be required by gcc to apply the attribute according |
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* to its docs (and also "warning: always_inline function might not be |
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* inlinable [-Wattributes]" is emitted). |
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* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-always_005finline-function-attribute |
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* clang: mentioned |
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*/ |
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#define __always_inline inline __attribute__((__always_inline__)) |
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/* |
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* The second argument is optional (default 0), so we use a variadic macro |
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* to make the shorthand. |
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* |
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* Beware: Do not apply this to functions which may return |
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* ERR_PTRs. Also, it is probably unwise to apply it to functions |
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* returning extra information in the low bits (but in that case the |
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* compiler should see some alignment anyway, when the return value is |
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* massaged by 'flags = ptr & 3; ptr &= ~3;'). |
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* |
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* Optional: only supported since gcc >= 4.9 |
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* Optional: not supported by icc |
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* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-assume_005faligned-function-attribute |
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* clang: https://clang.llvm.org/docs/AttributeReference.html#assume-aligned |
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*/ |
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#if __has_attribute(__assume_aligned__) |
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# define __assume_aligned(a, ...) __attribute__((__assume_aligned__(a, ## __VA_ARGS__))) |
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#else |
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# define __assume_aligned(a, ...) |
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#endif |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-cold-function-attribute |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Label-Attributes.html#index-cold-label-attribute |
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*/ |
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#define __cold __attribute__((__cold__)) |
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/* |
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* Note the long name. |
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* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-const-function-attribute |
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*/ |
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#define __attribute_const__ __attribute__((__const__)) |
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/* |
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* Optional: only supported since gcc >= 9 |
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* Optional: not supported by clang |
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* Optional: not supported by icc |
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* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-copy-function-attribute |
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*/ |
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#if __has_attribute(__copy__) |
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# define __copy(symbol) __attribute__((__copy__(symbol))) |
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#else |
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# define __copy(symbol) |
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#endif |
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/* |
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* Don't. Just don't. See commit 771c035372a0 ("deprecate the '__deprecated' |
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* attribute warnings entirely and for good") for more information. |
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* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-deprecated-function-attribute |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-deprecated-type-attribute |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-deprecated-variable-attribute |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Enumerator-Attributes.html#index-deprecated-enumerator-attribute |
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* clang: https://clang.llvm.org/docs/AttributeReference.html#deprecated |
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*/ |
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#define __deprecated |
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/* |
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* Optional: only supported since gcc >= 5.1 |
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* Optional: not supported by clang |
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* Optional: not supported by icc |
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* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-designated_005finit-type-attribute |
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*/ |
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#if __has_attribute(__designated_init__) |
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# define __designated_init __attribute__((__designated_init__)) |
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#else |
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# define __designated_init |
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#endif |
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/* |
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* Optional: not supported by clang |
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* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-externally_005fvisible-function-attribute |
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*/ |
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#if __has_attribute(__externally_visible__) |
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# define __visible __attribute__((__externally_visible__)) |
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#else |
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# define __visible |
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#endif |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-format-function-attribute |
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* clang: https://clang.llvm.org/docs/AttributeReference.html#format |
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*/ |
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#define __printf(a, b) __attribute__((__format__(printf, a, b))) |
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#define __scanf(a, b) __attribute__((__format__(scanf, a, b))) |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-gnu_005finline-function-attribute |
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* clang: https://clang.llvm.org/docs/AttributeReference.html#gnu-inline |
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*/ |
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#define __gnu_inline __attribute__((__gnu_inline__)) |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-malloc-function-attribute |
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*/ |
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#define __malloc __attribute__((__malloc__)) |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-mode-type-attribute |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-mode-variable-attribute |
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*/ |
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#define __mode(x) __attribute__((__mode__(x))) |
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/* |
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* Optional: only supported since gcc >= 7 |
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* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/x86-Function-Attributes.html#index-no_005fcaller_005fsaved_005fregisters-function-attribute_002c-x86 |
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* clang: https://clang.llvm.org/docs/AttributeReference.html#no-caller-saved-registers |
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*/ |
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#if __has_attribute(__no_caller_saved_registers__) |
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# define __no_caller_saved_registers __attribute__((__no_caller_saved_registers__)) |
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#else |
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# define __no_caller_saved_registers |
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#endif |
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/* |
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* Optional: not supported by clang |
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* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-noclone-function-attribute |
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*/ |
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#if __has_attribute(__noclone__) |
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# define __noclone __attribute__((__noclone__)) |
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#else |
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# define __noclone |
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#endif |
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/* |
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* Add the pseudo keyword 'fallthrough' so case statement blocks |
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* must end with any of these keywords: |
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* break; |
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* fallthrough; |
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* goto <label>; |
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* return [expression]; |
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* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Statement-Attributes.html#Statement-Attributes |
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*/ |
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#if __has_attribute(__fallthrough__) |
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# define fallthrough __attribute__((__fallthrough__)) |
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#else |
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# define fallthrough do {} while (0) /* fallthrough */ |
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#endif |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#Common-Function-Attributes |
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* clang: https://clang.llvm.org/docs/AttributeReference.html#flatten |
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*/ |
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# define __flatten __attribute__((flatten)) |
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/* |
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* Note the missing underscores. |
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* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-noinline-function-attribute |
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* clang: mentioned |
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*/ |
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#define noinline __attribute__((__noinline__)) |
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/* |
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* Optional: only supported since gcc >= 8 |
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* Optional: not supported by clang |
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* Optional: not supported by icc |
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* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-nonstring-variable-attribute |
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*/ |
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#if __has_attribute(__nonstring__) |
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# define __nonstring __attribute__((__nonstring__)) |
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#else |
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# define __nonstring |
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#endif |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-noreturn-function-attribute |
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* clang: https://clang.llvm.org/docs/AttributeReference.html#noreturn |
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* clang: https://clang.llvm.org/docs/AttributeReference.html#id1 |
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*/ |
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#define __noreturn __attribute__((__noreturn__)) |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-packed-type-attribute |
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* clang: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-packed-variable-attribute |
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*/ |
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#define __packed __attribute__((__packed__)) |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-pure-function-attribute |
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*/ |
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#define __pure __attribute__((__pure__)) |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-section-function-attribute |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-section-variable-attribute |
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* clang: https://clang.llvm.org/docs/AttributeReference.html#section-declspec-allocate |
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*/ |
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#define __section(section) __attribute__((__section__(section))) |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-unused-function-attribute |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-unused-type-attribute |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-unused-variable-attribute |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Label-Attributes.html#index-unused-label-attribute |
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* clang: https://clang.llvm.org/docs/AttributeReference.html#maybe-unused-unused |
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*/ |
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#define __always_unused __attribute__((__unused__)) |
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#define __maybe_unused __attribute__((__unused__)) |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-used-function-attribute |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-used-variable-attribute |
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*/ |
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#define __used __attribute__((__used__)) |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-warn_005funused_005fresult-function-attribute |
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* clang: https://clang.llvm.org/docs/AttributeReference.html#nodiscard-warn-unused-result |
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*/ |
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#define __must_check __attribute__((__warn_unused_result__)) |
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/* |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-weak-function-attribute |
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* gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-weak-variable-attribute |
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*/ |
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#define __weak __attribute__((__weak__)) |
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#endif /* __LINUX_COMPILER_ATTRIBUTES_H */
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