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Implement createSanitizerCtor, common helper function for all sanitizers

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Summary:
This helper function creates a ctor function, which calls sanitizer's
init function with given arguments. This constructor is then expected
to be added to module's ctors. The patch helps unifying how sanitizer
constructor functions are created, and how init functions are called
across all sanitizers.

Reviewers: kcc, samsonov

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8777

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236627 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ismail Pazarbasi
2015-05-06 18:48:22 +00:00
parent 00157f3ae8
commit 4e21d7aff9
2 changed files with 35 additions and 0 deletions
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21
lib/Transforms/Utils/ModuleUtils.cpp
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@@ -104,3 +104,24 @@ Function *llvm::checkSanitizerInterfaceFunction(Constant *FuncOrBitcast) {
Stream << "Sanitizer interface function redefined: " << *FuncOrBitcast;
report_fatal_error(Err);
}
std::pair<Function *, Function *> llvm::createSanitizerCtorAndInitFunctions(
Module &M, StringRef CtorName, StringRef InitName,
ArrayRef<Type *> InitArgTypes, ArrayRef<Value *> InitArgs) {
assert(!InitName.empty() && "Expected init function name");
assert(InitArgTypes.size() == InitArgTypes.size() &&
"Sanitizer's init function expects different number of arguments");
Function *Ctor = Function::Create(
FunctionType::get(Type::getVoidTy(M.getContext()), false),
GlobalValue::InternalLinkage, CtorName, &M);
BasicBlock *CtorBB = BasicBlock::Create(M.getContext(), "", Ctor);
IRBuilder<> IRB(ReturnInst::Create(M.getContext(), CtorBB));
Function *InitFunction =
checkSanitizerInterfaceFunction(M.getOrInsertFunction(
InitName, FunctionType::get(IRB.getVoidTy(), InitArgTypes, false),
AttributeSet()));
InitFunction->setLinkage(Function::ExternalLinkage);
IRB.CreateCall(InitFunction, InitArgs);
return std::make_pair(Ctor, InitFunction);
}