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); }