10b57cec5SDimitry Andric //===-- SystemZFrameLowering.h - Frame lowering for SystemZ -----*- C++ -*-===// 20b57cec5SDimitry Andric // 30b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 40b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 50b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 60b57cec5SDimitry Andric // 70b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 80b57cec5SDimitry Andric 90b57cec5SDimitry Andric #ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZFRAMELOWERING_H 100b57cec5SDimitry Andric #define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZFRAMELOWERING_H 110b57cec5SDimitry Andric 12*e8d8bef9SDimitry Andric #include "MCTargetDesc/SystemZMCTargetDesc.h" 130b57cec5SDimitry Andric #include "llvm/ADT/IndexedMap.h" 140b57cec5SDimitry Andric #include "llvm/CodeGen/TargetFrameLowering.h" 15*e8d8bef9SDimitry Andric #include "llvm/Support/TypeSize.h" 160b57cec5SDimitry Andric 170b57cec5SDimitry Andric namespace llvm { 180b57cec5SDimitry Andric class SystemZTargetMachine; 190b57cec5SDimitry Andric class SystemZSubtarget; 200b57cec5SDimitry Andric 210b57cec5SDimitry Andric class SystemZFrameLowering : public TargetFrameLowering { 220b57cec5SDimitry Andric IndexedMap<unsigned> RegSpillOffsets; 230b57cec5SDimitry Andric 240b57cec5SDimitry Andric public: 250b57cec5SDimitry Andric SystemZFrameLowering(); 260b57cec5SDimitry Andric 270b57cec5SDimitry Andric // Override TargetFrameLowering. 280b57cec5SDimitry Andric bool isFPCloseToIncomingSP() const override { return false; } 29480093f4SDimitry Andric bool 30480093f4SDimitry Andric assignCalleeSavedSpillSlots(MachineFunction &MF, 31480093f4SDimitry Andric const TargetRegisterInfo *TRI, 32480093f4SDimitry Andric std::vector<CalleeSavedInfo> &CSI) const override; 330b57cec5SDimitry Andric void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, 340b57cec5SDimitry Andric RegScavenger *RS) const override; 350b57cec5SDimitry Andric bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 360b57cec5SDimitry Andric MachineBasicBlock::iterator MBBI, 375ffd83dbSDimitry Andric ArrayRef<CalleeSavedInfo> CSI, 380b57cec5SDimitry Andric const TargetRegisterInfo *TRI) const override; 395ffd83dbSDimitry Andric bool 405ffd83dbSDimitry Andric restoreCalleeSavedRegisters(MachineBasicBlock &MBB, 410b57cec5SDimitry Andric MachineBasicBlock::iterator MBBII, 425ffd83dbSDimitry Andric MutableArrayRef<CalleeSavedInfo> CSI, 435ffd83dbSDimitry Andric const TargetRegisterInfo *TRI) const override; 440b57cec5SDimitry Andric void processFunctionBeforeFrameFinalized(MachineFunction &MF, 450b57cec5SDimitry Andric RegScavenger *RS) const override; 460b57cec5SDimitry Andric void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 470b57cec5SDimitry Andric void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 485ffd83dbSDimitry Andric void inlineStackProbe(MachineFunction &MF, 495ffd83dbSDimitry Andric MachineBasicBlock &PrologMBB) const override; 500b57cec5SDimitry Andric bool hasFP(const MachineFunction &MF) const override; 510b57cec5SDimitry Andric bool hasReservedCallFrame(const MachineFunction &MF) const override; 52*e8d8bef9SDimitry Andric StackOffset getFrameIndexReference(const MachineFunction &MF, int FI, 535ffd83dbSDimitry Andric Register &FrameReg) const override; 540b57cec5SDimitry Andric MachineBasicBlock::iterator 550b57cec5SDimitry Andric eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, 560b57cec5SDimitry Andric MachineBasicBlock::iterator MI) const override; 570b57cec5SDimitry Andric 580b57cec5SDimitry Andric // Return the byte offset from the incoming stack pointer of Reg's 595ffd83dbSDimitry Andric // ABI-defined save slot. Return 0 if no slot is defined for Reg. Adjust 605ffd83dbSDimitry Andric // the offset in case MF has packed-stack. 615ffd83dbSDimitry Andric unsigned getRegSpillOffset(MachineFunction &MF, Register Reg) const; 62480093f4SDimitry Andric 63480093f4SDimitry Andric // Get or create the frame index of where the old frame pointer is stored. 64480093f4SDimitry Andric int getOrCreateFramePointerSaveIndex(MachineFunction &MF) const; 655ffd83dbSDimitry Andric 665ffd83dbSDimitry Andric bool usePackedStack(MachineFunction &MF) const; 67*e8d8bef9SDimitry Andric 68*e8d8bef9SDimitry Andric // Return the offset of the backchain. 69*e8d8bef9SDimitry Andric unsigned getBackchainOffset(MachineFunction &MF) const { 70*e8d8bef9SDimitry Andric // The back chain is stored topmost with packed-stack. 71*e8d8bef9SDimitry Andric return usePackedStack(MF) ? SystemZMC::CallFrameSize - 8 : 0; 72*e8d8bef9SDimitry Andric } 730b57cec5SDimitry Andric }; 740b57cec5SDimitry Andric } // end namespace llvm 750b57cec5SDimitry Andric 760b57cec5SDimitry Andric #endif 77