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[msan] Make sure that report callbacks do not get merged. 

llvm-svn: 168873
This commit is contained in:
Evgeniy Stepanov 2012-11-29 12:30:18 +00:00
parent dde9dcc24b
commit 1d2da65bf8
1 changed files with 8 additions and 0 deletions
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8
llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
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@ -183,6 +183,8 @@ private:
MDNode *ColdCallWeights;
/// \brief The blacklist.
OwningPtr<BlackList> BL;
/// \brief An empty volatile inline asm that prevents callback merge.
InlineAsm *EmptyAsm;
friend class MemorySanitizerVisitor;
friend class VarArgAMD64Helper;
@ -295,6 +297,11 @@ bool MemorySanitizer::doInitialization(Module &M) {
OriginTLS = new GlobalVariable(
M, IRB.getInt32Ty(), false, GlobalVariable::ExternalLinkage, 0,
"__msan_origin_tls", 0, GlobalVariable::GeneralDynamicTLSModel);
// We insert an empty inline asm after __msan_report* to avoid callback merge.
EmptyAsm = InlineAsm::get(FunctionType::get(IRB.getVoidTy(), false),
StringRef(""), StringRef(""),
/*hasSideEffects=*/true);
return true;
}
@ -391,6 +398,7 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
}
CallInst *Call = IRB.CreateCall(MS.WarningFn);
Call->setDebugLoc(OrigIns->getDebugLoc());
IRB.CreateCall(MS.EmptyAsm);
DEBUG(dbgs() << " CHECK: " << *Cmp << "\n");
}
DEBUG(dbgs() << "DONE:\n" << F);