[opaque pointer types] CallSite: use getFunctionType() instead of going through PointerType::getElementType.

[dblaikie]

lib/Target/Mips/Mips16HardFloat.cpp

430

This code seems to be going to some efforts to support the possibility that V is null - does that case need to be handled in the new code?

[eddyb]

lib/Target/Mips/Mips16HardFloat.cpp

430

Not as far as I can tell, getFunctionType() seems to be guaranteed non-null.
The tests pass, although I'm not sure what kind of coverage LLVM has for the Mips16 (sub?)target.

[dblaikie]

Great - thanks! Please commit

[mjacob]

LGTM too. I'll commit it for you.

lib/Target/Mips/Mips16HardFloat.cpp

430

CI->getCalledValue() shouldn't return nullptr as well.

lib/CodeGen/SelectionDAG/FastISel.cpp

bool FastISel::lowerCallTo(const CallInst *CI, const char *SymName,
   MCSymbol *Sym = Ctx.getOrCreateSymbol(MangledName);
   return lowerCallTo(CI, Sym, NumArgs);
 }
 
 bool FastISel::lowerCallTo(const CallInst *CI, MCSymbol *Symbol,
                            unsigned NumArgs) {
   ImmutableCallSite CS(CI);
 
-  PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType());
-  FunctionType *FTy = cast<FunctionType>(PT->getElementType());
-  Type *RetTy = FTy->getReturnType();
+  FunctionType *FTy = CS.getFunctionType();
+  Type *RetTy = CS.getType();
 
   ArgListTy Args;
   Args.reserve(NumArgs);
 
   // Populate the argument list.
   // Attributes for args start at offset 1, after the return attribute.
   for (unsigned ArgI = 0; ArgI != NumArgs; ++ArgI) {
     Value *V = CI->getOperand(ArgI);
if (CLI.NumResultRegs && CLI.CS)
     updateValueMap(CLI.CS->getInstruction(), CLI.ResultReg, CLI.NumResultRegs);
 
   return true;
 }
 
 bool FastISel::lowerCall(const CallInst *CI) {
   ImmutableCallSite CS(CI);
 
-  PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType());
-  FunctionType *FuncTy = cast<FunctionType>(PT->getElementType());
-  Type *RetTy = FuncTy->getReturnType();
+  FunctionType *FuncTy = CS.getFunctionType();
+  Type *RetTy = CS.getType();
 
   ArgListTy Args;
   ArgListEntry Entry;
   Args.reserve(CS.arg_size());
 
   for (ImmutableCallSite::arg_iterator i = CS.arg_begin(), e = CS.arg_end();
        i != e; ++i) {
     Value *V = *i;

lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

SelectionDAGBuilder::lowerInvokable(TargetLowering::CallLoweringInfo &CLI,
   }
 
   return Result;
 }
 
 void SelectionDAGBuilder::LowerCallTo(ImmutableCallSite CS, SDValue Callee,
                                       bool isTailCall,
                                       const BasicBlock *EHPadBB) {
-  PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType());
-  FunctionType *FTy = cast<FunctionType>(PT->getElementType());
-  Type *RetTy = FTy->getReturnType();
+  FunctionType *FTy = CS.getFunctionType();
+  Type *RetTy = CS.getType();
 
   TargetLowering::ArgListTy Args;
   TargetLowering::ArgListEntry Entry;
   Args.reserve(CS.arg_size());
 
   for (ImmutableCallSite::arg_iterator i = CS.arg_begin(), e = CS.arg_end();
        i != e; ++i) {
     const Value *V = *i;

lib/Target/ARM/ARMFastISel.cpp

bool ARMFastISel::SelectCall(const Instruction *I,
   if (CI->isTailCall()) return false;
 
   // Check the calling convention.
   ImmutableCallSite CS(CI);
   CallingConv::ID CC = CS.getCallingConv();
 
   // TODO: Avoid some calling conventions?
 
-  PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType());
-  FunctionType *FTy = cast<FunctionType>(PT->getElementType());
+  FunctionType *FTy = CS.getFunctionType();
   bool isVarArg = FTy->isVarArg();
 
   // Handle *simple* calls for now.
   Type *RetTy = I->getType();
   MVT RetVT;
   if (RetTy->isVoidTy())
     RetVT = MVT::isVoid;
   else if (!isTypeLegal(RetTy, RetVT) && RetVT != MVT::i16 &&

lib/Target/Mips/Mips16HardFloat.cpp

for (BasicBlock::iterator I = BB->begin(), E = BB->end();
                            "__Mips16RetHelper");
         A = A.addAttribute(C, AttributeSet::FunctionIndex,
                            Attribute::ReadNone);
         A = A.addAttribute(C, AttributeSet::FunctionIndex,
                            Attribute::NoInline);
         Value *F = (M->getOrInsertFunction(Name, A, MyVoid, T, nullptr));
         CallInst::Create(F, Params, "", &Inst );
       } else if (const CallInst *CI = dyn_cast<CallInst>(I)) {
-        const Value* V = CI->getCalledValue();
-        Type* T = nullptr;
-        if (V) T = V->getType();
-        PointerType *PFT = nullptr;
-        if (T) PFT = dyn_cast<PointerType>(T);
-        FunctionType *FT = nullptr;
-        if (PFT) FT = dyn_cast<FunctionType>(PFT->getElementType());
+        FunctionType *FT = CI->getFunctionType();
         Function *F_ =  CI->getCalledFunction();
-        if (FT && needsFPReturnHelper(*FT) &&
+        if (needsFPReturnHelper(*FT) &&
             !(F_ && isIntrinsicInline(F_))) {
           Modified=true;
           F.addFnAttr("saveS2");
         }
         if (F_ && !isIntrinsicInline(F_)) {
           // pic mode calls are handled by already defined
           // helper functions
           if (needsFPReturnHelper(*F_)) {