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Add cold attribute to one time construction APIs 

_cxa_guard_acquire is used for only one purpose,
namely guarding local static variable initialization,
and since that purpose is definitionally cold,
it should be attributed as cold

Reviewed By: ldionne

Reviewers: mclow.lists, ldionne, jfb, yfeldblum

Differential Revision: https://reviews.llvm.org/D85873
This commit is contained in:
Aditya Kumar 2020-08-12 22:11:50 -07:00
parent 11446b02c7
commit d54f5979bb
1 changed files with 7 additions and 6 deletions
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13
libcxxabi/include/cxxabi.h
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@ -21,6 +21,7 @@
#define _LIBCPPABI_VERSION 1002
#define _LIBCXXABI_NORETURN __attribute__((noreturn))
#define _LIBCXXABI_ALWAYS_COLD __attribute__((cold))
#ifdef __cplusplus
@ -78,13 +79,13 @@ extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_NORETURN void __cxa_deleted_virtual(void);
// 3.3.2 One-time Construction API
#if defined(_LIBCXXABI_GUARD_ABI_ARM)
extern _LIBCXXABI_FUNC_VIS int __cxa_guard_acquire(uint32_t *);
extern _LIBCXXABI_FUNC_VIS void __cxa_guard_release(uint32_t *);
extern _LIBCXXABI_FUNC_VIS void __cxa_guard_abort(uint32_t *);
extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_ALWAYS_COLD int __cxa_guard_acquire(uint32_t *);
extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_ALWAYS_COLD void __cxa_guard_release(uint32_t *);
extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_ALWAYS_COLD void __cxa_guard_abort(uint32_t *);
#else
extern _LIBCXXABI_FUNC_VIS int __cxa_guard_acquire(uint64_t *);
extern _LIBCXXABI_FUNC_VIS void __cxa_guard_release(uint64_t *);
extern _LIBCXXABI_FUNC_VIS void __cxa_guard_abort(uint64_t *);
extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_ALWAYS_COLD int __cxa_guard_acquire(uint64_t *);
extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_ALWAYS_COLD void __cxa_guard_release(uint64_t *);
extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_ALWAYS_COLD void __cxa_guard_abort(uint64_t *);
#endif
// 3.3.3 Array Construction and Destruction API