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[TSan] Refine longjmp key management on Darwin 

NFC.

llvm-svn: 365554
This commit is contained in:
Julian Lettner 2019-07-09 20:47:37 +00:00
parent 9abe8c4805
commit c11c43b64f
1 changed files with 6 additions and 5 deletions
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11
compiler-rt/lib/tsan/rtl/tsan_platform_mac.cc
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@ -238,8 +238,7 @@ void InitializePlatformEarly() {
#endif
}
static const uptr kPthreadSetjmpXorKeySlot = 0x7;
extern "C" uptr __tsan_darwin_setjmp_xor_key = 0;
static uptr longjmp_xor_key = 0;
void InitializePlatform() {
DisableCoreDumperIfNecessary();
@ -254,8 +253,9 @@ void InitializePlatform() {
#endif
if (GetMacosVersion() >= MACOS_VERSION_MOJAVE) {
__tsan_darwin_setjmp_xor_key =
(uptr)pthread_getspecific(kPthreadSetjmpXorKeySlot);
// Libsystem currently uses a process-global key; this might change.
const unsigned kTLSLongjmpXorKeySlot = 0x7;
longjmp_xor_key = (uptr)pthread_getspecific(kTLSLongjmpXorKeySlot);
}
}
@ -268,7 +268,8 @@ void InitializePlatform() {
uptr ExtractLongJmpSp(uptr *env) {
uptr mangled_sp = env[LONG_JMP_SP_ENV_SLOT];
return mangled_sp ^ __tsan_darwin_setjmp_xor_key;
uptr sp = mangled_sp ^ longjmp_xor_key;
return sp;
}
#if !SANITIZER_GO