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[asan] change the default mapping offset on x86_64 to 0x7fff8000. This gives roughly 5% speedup. Since this is an ABI change, bump the asan ABI version by renaming __asan_init to __asan_init_v1. llvm part, compiler-rt part will follow

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174957 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany
2013-02-12 11:11:02 +00:00
parent f54676234a
commit 0bc55d517e
1 changed files with 5 additions and 3 deletions
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8
lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@@ -68,7 +68,7 @@ static const char *kAsanRegisterGlobalsName = "__asan_register_globals";
static const char *kAsanUnregisterGlobalsName = "__asan_unregister_globals"; static const char *kAsanUnregisterGlobalsName = "__asan_unregister_globals";
static const char *kAsanPoisonGlobalsName = "__asan_before_dynamic_init"; static const char *kAsanPoisonGlobalsName = "__asan_before_dynamic_init";
static const char *kAsanUnpoisonGlobalsName = "__asan_after_dynamic_init"; static const char *kAsanUnpoisonGlobalsName = "__asan_after_dynamic_init";
static const char *kAsanInitName = "__asan_init"; static const char *kAsanInitName = "__asan_init_v1";
static const char *kAsanHandleNoReturnName = "__asan_handle_no_return"; static const char *kAsanHandleNoReturnName = "__asan_handle_no_return";
static const char *kAsanMappingOffsetName = "__asan_mapping_offset"; static const char *kAsanMappingOffsetName = "__asan_mapping_offset";
static const char *kAsanMappingScaleName = "__asan_mapping_scale"; static const char *kAsanMappingScaleName = "__asan_mapping_scale";
@@ -136,7 +136,7 @@ static cl::opt<int> ClMappingOffsetLog("asan-mapping-offset-log",
cl::desc("offset of asan shadow mapping"), cl::Hidden, cl::init(-1)); cl::desc("offset of asan shadow mapping"), cl::Hidden, cl::init(-1));
static cl::opt<bool> ClShort64BitOffset("asan-short-64bit-mapping-offset", static cl::opt<bool> ClShort64BitOffset("asan-short-64bit-mapping-offset",
cl::desc("Use short immediate constant as the mapping offset for 64bit"), cl::desc("Use short immediate constant as the mapping offset for 64bit"),
cl::Hidden, cl::init(false)); cl::Hidden, cl::init(true));
// Optimization flags. Not user visible, used mostly for testing // Optimization flags. Not user visible, used mostly for testing
// and benchmarking the tool. // and benchmarking the tool.
@@ -203,6 +203,7 @@ static ShadowMapping getShadowMapping(const Module &M, int LongSize,
llvm::Triple TargetTriple(M.getTargetTriple()); llvm::Triple TargetTriple(M.getTargetTriple());
bool IsAndroid = TargetTriple.getEnvironment() == llvm::Triple::Android; bool IsAndroid = TargetTriple.getEnvironment() == llvm::Triple::Android;
bool IsPPC64 = TargetTriple.getArch() == llvm::Triple::ppc64; bool IsPPC64 = TargetTriple.getArch() == llvm::Triple::ppc64;
bool IsX86_64 = TargetTriple.getArch() == llvm::Triple::x86_64;
ShadowMapping Mapping; ShadowMapping Mapping;
@@ -214,7 +215,8 @@ static ShadowMapping getShadowMapping(const Module &M, int LongSize,
Mapping.Offset = (IsAndroid || ZeroBaseShadow) ? 0 : Mapping.Offset = (IsAndroid || ZeroBaseShadow) ? 0 :
(LongSize == 32 ? kDefaultShadowOffset32 : (LongSize == 32 ? kDefaultShadowOffset32 :
IsPPC64 ? kPPC64_ShadowOffset64 : kDefaultShadowOffset64); IsPPC64 ? kPPC64_ShadowOffset64 : kDefaultShadowOffset64);
if (!ZeroBaseShadow && ClShort64BitOffset && LongSize == 64) { if (!ZeroBaseShadow && ClShort64BitOffset && IsX86_64) {
assert(LongSize == 64);
Mapping.Offset = kDefaultShort64bitShadowOffset; Mapping.Offset = kDefaultShort64bitShadowOffset;
} if (!ZeroBaseShadow && ClMappingOffsetLog >= 0) { } if (!ZeroBaseShadow && ClMappingOffsetLog >= 0) {
// Zero offset log is the special case. // Zero offset log is the special case.