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[asan] use names of globals instead of an external set to distinguish the globals generated by asan

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168368 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany 2012-11-20 14:16:08 +00:00
parent 407790604b
commit 51c7c65e32
1 changed files with 8 additions and 4 deletions
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12
lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -69,6 +69,7 @@ static const char *kAsanMappingOffsetName = "__asan_mapping_offset";
static const char *kAsanMappingScaleName = "__asan_mapping_scale";
static const char *kAsanStackMallocName = "__asan_stack_malloc";
static const char *kAsanStackFreeName = "__asan_stack_free";
static const char *kAsanGenPrefix = "__asan_gen_";
static const int kAsanStackLeftRedzoneMagic = 0xf1;
static const int kAsanStackMidRedzoneMagic = 0xf2;
@ -239,7 +240,6 @@ struct AddressSanitizer : public FunctionPass {
// This array is indexed by AccessIsWrite and log2(AccessSize).
Function *AsanErrorCallback[2][kNumberOfAccessSizes];
InlineAsm *EmptyAsm;
SmallSet<GlobalValue*, 32> GlobalsCreatedByAsan;
SetOfDynamicallyInitializedGlobals DynamicallyInitializedGlobals;
};
@ -268,7 +268,12 @@ static size_t TypeSizeToSizeIndex(uint32_t TypeSize) {
static GlobalVariable *createPrivateGlobalForString(Module &M, StringRef Str) {
Constant *StrConst = ConstantDataArray::getString(M.getContext(), Str);
return new GlobalVariable(M, StrConst->getType(), true,
GlobalValue::PrivateLinkage, StrConst, "");
GlobalValue::PrivateLinkage, StrConst,
kAsanGenPrefix);
}
static bool GlobalWasGeneratedByAsan(GlobalVariable *G) {
return G->getName().find(kAsanGenPrefix) == 0;
}
Value *AddressSanitizer::memToShadow(Value *Shadow, IRBuilder<> &IRB) {
@ -508,7 +513,7 @@ 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.
if (GlobalWasGeneratedByAsan(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 &&
@ -1093,7 +1098,6 @@ bool AddressSanitizer::poisonStackInFunction(Function &F) {
BasePlus1 = IRB.CreateIntToPtr(BasePlus1, IntptrPtrTy);
GlobalVariable *StackDescriptionGlobal =
createPrivateGlobalForString(*F.getParent(), StackDescription.str());
GlobalsCreatedByAsan.insert(StackDescriptionGlobal);
Value *Description = IRB.CreatePointerCast(StackDescriptionGlobal, IntptrTy);
IRB.CreateStore(Description, BasePlus1);