diff options
| -rw-r--r-- | lib/Transforms/Instrumentation/AddressSanitizer.cpp | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/lib/Transforms/Instrumentation/AddressSanitizer.cpp index 544e22c..a51bd7e 100644 --- a/lib/Transforms/Instrumentation/AddressSanitizer.cpp +++ b/lib/Transforms/Instrumentation/AddressSanitizer.cpp @@ -579,18 +579,23 @@ bool AddressSanitizer::runOnModule(Module &M) { if (ClGlobals) Res |= insertGlobalRedzones(M); - // Tell the run-time the current values of mapping offset and scale. - GlobalValue *asan_mapping_offset = - new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, - ConstantInt::get(IntptrTy, MappingOffset), - kAsanMappingOffsetName); - GlobalValue *asan_mapping_scale = - new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, - ConstantInt::get(IntptrTy, MappingScale), - kAsanMappingScaleName); - // Read these globals, otherwise they may be optimized away. - IRB.CreateLoad(asan_mapping_scale, true); - IRB.CreateLoad(asan_mapping_offset, true); + if (ClMappingOffsetLog >= 0) { + // Tell the run-time the current values of mapping offset and scale. + GlobalValue *asan_mapping_offset = + new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, + ConstantInt::get(IntptrTy, MappingOffset), + kAsanMappingOffsetName); + // Read the global, otherwise it may be optimized away. + IRB.CreateLoad(asan_mapping_offset, true); + } + if (ClMappingScale) { + GlobalValue *asan_mapping_scale = + new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage, + ConstantInt::get(IntptrTy, MappingScale), + kAsanMappingScaleName); + // Read the global, otherwise it may be optimized away. + IRB.CreateLoad(asan_mapping_scale, true); + } for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) { |