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[asan] Delay creation of asan ctor.

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Create the constructor in the module pass.
This in needed for the GC-friendly globals change, where the constructor can be
put in a comdat  in some cases, but we don't know about that in the function
pass.

This is a rebase of r298731 which was reverted due to a false alarm.

llvm-svn: 299695
This commit is contained in:
Evgeniy Stepanov
2017-04-06 19:55:09 +00:00
parent db4cafa6c4
commit 039af609f1
4 changed files with 31 additions and 23 deletions
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18
llvm/lib/Transforms/Utils/ModuleUtils.cpp
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@@ -138,6 +138,17 @@ Function *llvm::checkSanitizerInterfaceFunction(Constant *FuncOrBitcast) {
report_fatal_error(Err);
}
Function *llvm::declareSanitizerInitFunction(Module &M, StringRef InitName,
ArrayRef<Type *> InitArgTypes) {
assert(!InitName.empty() && "Expected init function name");
Function *F = checkSanitizerInterfaceFunction(M.getOrInsertFunction(
InitName,
FunctionType::get(Type::getVoidTy(M.getContext()), InitArgTypes, false),
AttributeList()));
F->setLinkage(Function::ExternalLinkage);
return F;
}
std::pair<Function *, Function *> llvm::createSanitizerCtorAndInitFunctions(
Module &M, StringRef CtorName, StringRef InitName,
ArrayRef<Type *> InitArgTypes, ArrayRef<Value *> InitArgs,
@@ -145,16 +156,13 @@ std::pair<Function *, Function *> llvm::createSanitizerCtorAndInitFunctions(
assert(!InitName.empty() && "Expected init function name");
assert(InitArgs.size() == InitArgTypes.size() &&
"Sanitizer's init function expects different number of arguments");
Function *InitFunction =
declareSanitizerInitFunction(M, InitName, InitArgTypes);
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),
AttributeList()));
InitFunction->setLinkage(Function::ExternalLinkage);
IRB.CreateCall(InitFunction, InitArgs);
if (!VersionCheckName.empty()) {
Function *VersionCheckFunction =