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Use new interfaces to correctly lower varargs and return/frame address intrinsics.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19407 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-09 00:00:49 +00:00
parent f19ae7df65
commit 39ae362279
1 changed files with 65 additions and 29 deletions
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94
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -304,14 +304,12 @@ public:
void visitPHI(PHINode &I) { } // PHI nodes are handled specially.
void visitCall(CallInst &I);
// FIXME: These should go through the FunctionLoweringInfo object!!!
void visitVAStart(CallInst &I);
void visitVANext(VANextInst &I);
void visitVAArg(VAArgInst &I);
void visitVAEnd(CallInst &I);
void visitVACopy(CallInst &I);
void visitReturnAddress(CallInst &I);
void visitFrameAddress(CallInst &I);
void visitFrameReturnAddress(CallInst &I, bool isFrameAddress);
void visitMemSet(CallInst &I);
void visitMemCpy(CallInst &I);
@ -576,10 +574,8 @@ void SelectionDAGLowering::visitCall(CallInst &I) {
case Intrinsic::vastart: visitVAStart(I); return;
case Intrinsic::vaend: visitVAEnd(I); return;
case Intrinsic::vacopy: visitVACopy(I); return;
case Intrinsic::returnaddress:
visitReturnAddress(I); return;
case Intrinsic::frameaddress:
visitFrameAddress(I); return;
case Intrinsic::returnaddress: visitFrameReturnAddress(I, false); return;
case Intrinsic::frameaddress: visitFrameReturnAddress(I, true); return;
default:
// FIXME: IMPLEMENT THESE.
// readport, writeport, readio, writeio
@ -651,46 +647,86 @@ void SelectionDAGLowering::visitFree(FreeInst &I) {
DAG.setRoot(Result.second);
}
void SelectionDAGLowering::visitVAStart(CallInst &I) {
std::pair<SDOperand, SDOperand>
TargetLowering::LowerVAStart(SDOperand Chain, SelectionDAG &DAG) {
// We have no sane default behavior, just emit a useful error message and bail
// out.
std::cerr << "Variable arguments support not implemented for this target!\n";
std::cerr << "Variable arguments handling not implemented on this target!\n";
abort();
}
SDOperand TargetLowering::LowerVAEnd(SDOperand Chain, SDOperand L,
SelectionDAG &DAG) {
// Default to a noop.
return Chain;
}
std::pair<SDOperand,SDOperand>
TargetLowering::LowerVACopy(SDOperand Chain, SDOperand L, SelectionDAG &DAG) {
// Default to returning the input list.
return std::make_pair(L, Chain);
}
std::pair<SDOperand,SDOperand>
TargetLowering::LowerVAArgNext(bool isVANext, SDOperand Chain, SDOperand VAList,
const Type *ArgTy, SelectionDAG &DAG) {
// We have no sane default behavior, just emit a useful error message and bail
// out.
std::cerr << "Variable arguments handling not implemented on this target!\n";
abort();
}
void SelectionDAGLowering::visitVAStart(CallInst &I) {
std::pair<SDOperand,SDOperand> Result = TLI.LowerVAStart(DAG.getRoot(), DAG);
setValue(&I, Result.first);
DAG.setRoot(Result.second);
}
void SelectionDAGLowering::visitVAArg(VAArgInst &I) {
std::pair<SDOperand,SDOperand> Result =
TLI.LowerVAArgNext(false, DAG.getRoot(), getValue(I.getOperand(0)),
I.getType(), DAG);
setValue(&I, Result.first);
DAG.setRoot(Result.second);
}
void SelectionDAGLowering::visitVANext(VANextInst &I) {
// We have no sane default behavior, just emit a useful error message and bail
// out.
std::cerr << "Variable arguments support not implemented for this target!\n";
abort();
}
void SelectionDAGLowering::visitVAArg(VAArgInst &I) {
// We have no sane default behavior, just emit a useful error message and bail
// out.
std::cerr << "Variable arguments support not implemented for this target!\n";
abort();
std::pair<SDOperand,SDOperand> Result =
TLI.LowerVAArgNext(true, DAG.getRoot(), getValue(I.getOperand(0)),
I.getArgType(), DAG);
setValue(&I, Result.first);
DAG.setRoot(Result.second);
}
void SelectionDAGLowering::visitVAEnd(CallInst &I) {
// By default, this is a noop. On almost all targets, this is fine.
DAG.setRoot(TLI.LowerVAEnd(DAG.getRoot(), getValue(I.getOperand(1)), DAG));
}
void SelectionDAGLowering::visitVACopy(CallInst &I) {
// By default, vacopy just does a simple pointer copy.
setValue(&I, getValue(I.getOperand(1)));
std::pair<SDOperand,SDOperand> Result =
TLI.LowerVACopy(DAG.getRoot(), getValue(I.getOperand(1)), DAG);
setValue(&I, Result.first);
DAG.setRoot(Result.second);
}
void SelectionDAGLowering::visitReturnAddress(CallInst &I) {
// It is always conservatively correct for llvm.returnaddress to return 0.
setValue(&I, getIntPtrConstant(0));
// It is always conservatively correct for llvm.returnaddress and
// llvm.frameaddress to return 0.
std::pair<SDOperand, SDOperand>
TargetLowering::LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain,
unsigned Depth, SelectionDAG &DAG) {
return std::make_pair(DAG.getConstant(0, getPointerTy()), Chain);
}
void SelectionDAGLowering::visitFrameAddress(CallInst &I) {
// It is always conservatively correct for llvm.frameaddress to return 0.
setValue(&I, getIntPtrConstant(0));
void SelectionDAGLowering::visitFrameReturnAddress(CallInst &I, bool isFrame) {
unsigned Depth = (unsigned)cast<ConstantUInt>(I.getOperand(1))->getValue();
std::pair<SDOperand,SDOperand> Result =
TLI.LowerFrameReturnAddress(isFrame, DAG.getRoot(), Depth, DAG);
setValue(&I, Result.first);
DAG.setRoot(Result.second);
}
void SelectionDAGLowering::visitMemSet(CallInst &I) {
MVT::ValueType IntPtr = TLI.getPointerTy();
const Type *IntPtrTy = TLI.getTargetData().getIntPtrType();