Remangle intrinsics names when types are renamed
This is a resubmittion of previously reverted rL273568.
This is a fix for the problem mentioned in "LTO and intrinsics mangling" llvm-dev mail thread:
http://lists.llvm.org/pipermail/llvm-dev/2016-April/098387.html
Reviewers: mehdi_amini, reames
Differential Revision: http://reviews.llvm.org/D19373
llvm-svn: 273686
diff --git a/llvm/lib/IR/Function.cpp b/llvm/lib/IR/Function.cpp
index 29ed68a..0da9b98 100644
--- a/llvm/lib/IR/Function.cpp
+++ b/llvm/lib/IR/Function.cpp
@@ -1080,6 +1080,40 @@
return true;
}
+Optional<Function*> Intrinsic::remangleIntrinsicFunction(Function *F) {
+ Intrinsic::ID ID = F->getIntrinsicID();
+ if (!ID)
+ return None;
+
+ FunctionType *FTy = F->getFunctionType();
+ // Accumulate an array of overloaded types for the given intrinsic
+ SmallVector<Type *, 4> ArgTys;
+ {
+ SmallVector<Intrinsic::IITDescriptor, 8> Table;
+ getIntrinsicInfoTableEntries(ID, Table);
+ ArrayRef<Intrinsic::IITDescriptor> TableRef = Table;
+
+ // If we encounter any problems matching the signature with the descriptor
+ // just give up remangling. It's up to verifier to report the discrepancy.
+ if (Intrinsic::matchIntrinsicType(FTy->getReturnType(), TableRef, ArgTys))
+ return None;
+ for (auto Ty : FTy->params())
+ if (Intrinsic::matchIntrinsicType(Ty, TableRef, ArgTys))
+ return None;
+ if (Intrinsic::matchIntrinsicVarArg(FTy->isVarArg(), TableRef))
+ return None;
+ }
+
+ StringRef Name = F->getName();
+ if (Name == Intrinsic::getName(ID, ArgTys))
+ return None;
+
+ auto NewDecl = Intrinsic::getDeclaration(F->getParent(), ID, ArgTys);
+ NewDecl->setCallingConv(F->getCallingConv());
+ assert(NewDecl->getFunctionType() == FTy && "Shouldn't change the signature");
+ return NewDecl;
+}
+
/// hasAddressTaken - returns true if there are any uses of this function
/// other than direct calls or invokes to it.
bool Function::hasAddressTaken(const User* *PutOffender) const {