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| author | jason <jason@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-12-28 04:36:54 +0000 |
|---|---|---|
| committer | jason <jason@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-12-28 04:36:54 +0000 |
| commit | 2ca3d4265da8753b1bf9b447e99bfc4f6259e17c (patch) | |
| tree | d723d1a31c0c3358f41a176191bde7ef4add806e /gcc/target.h | |
| parent | 306df4c058c3ca47aff2e6c90954ea9268878f93 (diff) | |
| download | gcc-2ca3d4265da8753b1bf9b447e99bfc4f6259e17c.tar.gz | |
libstdc++:
Add memory barriers to the double-checked locking used for static
initialization.
* libsupc++/guard.cc (__test_and_acquire): Define default.
(_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release)
(_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise.
(recursion_push, recursion_pop): New abstraction functions.
(__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE.
(__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE.
* config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename
from _GLIBCXX_GUARD_ACQUIRE and reverse sense.
(_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE.
* config/cpu/arm/cxxabi_tweaks.h: Likewise.
* config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER)
(_GLIBCXX_WRITE_MEM_BARRIER): Define.
* config/cpu/powerpc/atomic_word.h: Likewise.
* config/cpu/sparc/atomic_word.h: Likewise.
* config/cpu/generic/atomic_word.h: Define them, commented out.
* include/bits/atomicity.h: Define defaults.
* config/cpu/ia64/atomic_word.h (__test_and_acquire)
(__set_and_release): New inlines.
(_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define.
(_GLIBCXX_GUARD_SET_AND_RELEASE): Define.
* libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of
abort();
gcc:
* doc/tm.texi (TARGET_RELAXED_ORDERING): Document.
* target.h (struct gcc_target): Add relaxed_ordering field.
* target-def.h (TARGET_RELAXED_ORDERING): Define default.
(TARGET_INITIALIZER): Add it.
* config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define.
* config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define.
* config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define.
* config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define.
* cp/decl.c (expand_static_init): Don't use shortcut if
targetm.relaxed_ordering.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@92659 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/target.h')
| -rw-r--r-- | gcc/target.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gcc/target.h b/gcc/target.h index 4f4b49ebb51..9ad460c18c9 100644 --- a/gcc/target.h +++ b/gcc/target.h @@ -598,6 +598,10 @@ struct gcc_target /* True if #pragma extern_prefix is to be supported. */ bool handle_pragma_extern_prefix; + /* True if the target is allowed to reorder memory accesses unless + synchronization is explicitly requested. */ + bool relaxed_ordering; + /* Leave the boolean fields at the end. */ }; |