static SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) {
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
MFI->setReturnAddressIsTaken(true);
EVT VT = Op.getValueType();
DebugLoc dl = Op.getDebugLoc();
unsigned RetReg = SP::I7;
uint64_t depth = Op.getConstantOperandVal(0);
SDValue RetAddr;
if (depth == 0)
RetAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, RetReg, VT);
else {
// flush first to make sure the windowed registers' values are in stack
SDValue Chain = getFLUSHW(Op, DAG);
RetAddr = DAG.getCopyFromReg(Chain, dl, SP::I6, VT);
for (uint64_t i = 0; i != depth; ++i) {
SDValue Ptr = DAG.getNode(ISD::ADD,
dl, MVT::i32,
RetAddr,
DAG.getIntPtrConstant((i == depth-1)?60:56));
RetAddr = DAG.getLoad(MVT::i32, dl,
Chain,
Ptr,
MachinePointerInfo(), false, false, 0);
}
}
return RetAddr;
}
SDValue WebAssemblyTargetLowering::LowerFRAMEADDR(SDValue Op,
SelectionDAG &DAG) const {
// Non-zero depths are not supported by WebAssembly currently. Use the
// legalizer's default expansion, which is to return 0 (what this function is
// documented to do).
if (Op.getConstantOperandVal(0) > 0)
return SDValue();
DAG.getMachineFunction().getFrameInfo()->setFrameAddressIsTaken(true);
EVT VT = Op.getValueType();
unsigned FP =
Subtarget->getRegisterInfo()->getFrameRegister(DAG.getMachineFunction());
return DAG.getCopyFromReg(DAG.getEntryNode(), SDLoc(Op), FP, VT);
}
