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DataFlowSanitizer: Factor the wrapper builder out to buildWrapperFunction.

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Differential Revision: http://llvm-reviews.chandlerc.com/D1441

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189053 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne 2013-08-22 20:08:11 +00:00
parent f1366c5524
commit 4f68e9ea8e
1 changed files with 33 additions and 20 deletions
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53
lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
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@ -186,6 +186,9 @@ class DataFlowSanitizer : public ModulePass {
InstrumentedABI getInstrumentedABI();
WrapperKind getWrapperKind(Function *F);
void addGlobalNamePrefix(GlobalValue *GV);
Function *buildWrapperFunction(Function *F, StringRef NewFName,
GlobalValue::LinkageTypes NewFLink,
FunctionType *NewFT);
public:
DataFlowSanitizer(StringRef ABIListFile = StringRef(),
@ -387,6 +390,33 @@ void DataFlowSanitizer::addGlobalNamePrefix(GlobalValue *GV) {
}
}
Function *
DataFlowSanitizer::buildWrapperFunction(Function *F, StringRef NewFName,
GlobalValue::LinkageTypes NewFLink,
FunctionType *NewFT) {
FunctionType *FT = F->getFunctionType();
Function *NewF = Function::Create(NewFT, NewFLink, NewFName,
F->getParent());
NewF->copyAttributesFrom(F);
NewF->removeAttributes(
AttributeSet::ReturnIndex,
AttributeFuncs::typeIncompatible(NewFT->getReturnType(),
AttributeSet::ReturnIndex));
BasicBlock *BB = BasicBlock::Create(*Ctx, "entry", NewF);
std::vector<Value *> Args;
unsigned n = FT->getNumParams();
for (Function::arg_iterator ai = NewF->arg_begin(); n != 0; ++ai, --n)
Args.push_back(&*ai);
CallInst *CI = CallInst::Create(F, Args, "", BB);
if (FT->getReturnType()->isVoidTy())
ReturnInst::Create(*Ctx, BB);
else
ReturnInst::Create(*Ctx, CI, BB);
return NewF;
}
bool DataFlowSanitizer::runOnModule(Module &M) {
if (!DL)
return false;
@ -521,27 +551,10 @@ bool DataFlowSanitizer::runOnModule(Module &M) {
? getArgsFunctionType(FT)
: FT;
Function *NewF =
Function::Create(NewFT, GlobalValue::LinkOnceODRLinkage,
std::string("dfsw$") + F.getName(), &M);
NewF->copyAttributesFrom(&F);
NewF->removeAttributes(
AttributeSet::ReturnIndex,
AttributeFuncs::typeIncompatible(NewFT->getReturnType(),
AttributeSet::ReturnIndex));
buildWrapperFunction(&F, std::string("dfsw$") + std::string(F.getName()),
GlobalValue::LinkOnceODRLinkage, NewFT);
if (getInstrumentedABI() == IA_TLS)
NewF->removeAttributes(AttributeSet::FunctionIndex,
ReadOnlyNoneAttrs);
BasicBlock *BB = BasicBlock::Create(*Ctx, "entry", NewF);
std::vector<Value *> Args;
unsigned n = FT->getNumParams();
for (Function::arg_iterator ai = NewF->arg_begin(); n != 0; ++ai, --n)
Args.push_back(&*ai);
CallInst *CI = CallInst::Create(&F, Args, "", BB);
if (FT->getReturnType()->isVoidTy())
ReturnInst::Create(*Ctx, BB);
else
ReturnInst::Create(*Ctx, CI, BB);
NewF->removeAttributes(AttributeSet::FunctionIndex, ReadOnlyNoneAttrs);
Value *WrappedFnCst =
ConstantExpr::getBitCast(NewF, PointerType::getUnqual(FT));