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[asan] don't instrument globals that we've created ourselves (reduces the binary size a bit)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167230 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany
2012-11-01 13:42:40 +00:00
parent 174fbec3df
commit a5f54f1443
2 changed files with 25 additions and 3 deletions
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9
lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -215,6 +215,7 @@ struct AddressSanitizer : public FunctionPass {
Function *AsanErrorCallback[2][kNumberOfAccessSizes];
InlineAsm *EmptyAsm;
SmallSet<GlobalValue*, 32> DynamicallyInitializedGlobals;
SmallSet<GlobalValue*, 32> GlobalsCreatedByAsan;
};
} // namespace
@ -508,6 +509,7 @@ bool AddressSanitizer::ShouldInstrumentGlobal(GlobalVariable *G) {
if (BL->isIn(*G)) return false;
if (!Ty->isSized()) return false;
if (!G->hasInitializer()) return false;
if (GlobalsCreatedByAsan.count(G)) return false; // Our own global.
// Touch only those globals that will not be defined in other modules.
// Don't handle ODR type linkages since other modules may be built w/o asan.
if (G->getLinkage() != GlobalVariable::ExternalLinkage &&
@ -1090,9 +1092,10 @@ bool AddressSanitizer::poisonStackInFunction(Function &F) {
Value *BasePlus1 = IRB.CreateAdd(LocalStackBase,
ConstantInt::get(IntptrTy, LongSize/8));
BasePlus1 = IRB.CreateIntToPtr(BasePlus1, IntptrPtrTy);
Value *Description = IRB.CreatePointerCast(
createPrivateGlobalForString(*F.getParent(), StackDescription.str()),
IntptrTy);
GlobalVariable *StackDescriptionGlobal =
createPrivateGlobalForString(*F.getParent(), StackDescription.str());
GlobalsCreatedByAsan.insert(StackDescriptionGlobal);
Value *Description = IRB.CreatePointerCast(StackDescriptionGlobal, IntptrTy);
IRB.CreateStore(Description, BasePlus1);
// Poison the stack redzones at the entry.