1 //===-- SystemZFrameLowering.h - Frame lowering for SystemZ -----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZFRAMELOWERING_H
11 #define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZFRAMELOWERING_H
13 #include "llvm/ADT/IndexedMap.h"
14 #include "llvm/Target/TargetFrameLowering.h"
17 class SystemZTargetMachine;
18 class SystemZSubtarget;
20 class SystemZFrameLowering : public TargetFrameLowering {
21 IndexedMap<unsigned> RegSpillOffsets;
24 SystemZFrameLowering();
26 // Override TargetFrameLowering.
27 bool isFPCloseToIncomingSP() const override { return false; }
28 const SpillSlot *getCalleeSavedSpillSlots(unsigned &NumEntries) const
30 void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
31 RegScavenger *RS) const override;
32 bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
33 MachineBasicBlock::iterator MBBI,
34 const std::vector<CalleeSavedInfo> &CSI,
35 const TargetRegisterInfo *TRI) const override;
36 bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
37 MachineBasicBlock::iterator MBBII,
38 const std::vector<CalleeSavedInfo> &CSI,
39 const TargetRegisterInfo *TRI) const
41 void processFunctionBeforeFrameFinalized(MachineFunction &MF,
42 RegScavenger *RS) const override;
43 void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
44 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
45 bool hasFP(const MachineFunction &MF) const override;
46 int getFrameIndexReference(const MachineFunction &MF, int FI,
47 unsigned &FrameReg) const override;
48 bool hasReservedCallFrame(const MachineFunction &MF) const override;
49 void eliminateCallFramePseudoInstr(MachineFunction &MF,
50 MachineBasicBlock &MBB,
51 MachineBasicBlock::iterator MI) const
54 // Return the number of bytes in the callee-allocated part of the frame.
55 uint64_t getAllocatedStackSize(const MachineFunction &MF) const;
57 // Return the byte offset from the incoming stack pointer of Reg's
58 // ABI-defined save slot. Return 0 if no slot is defined for Reg.
59 unsigned getRegSpillOffset(unsigned Reg) const {
60 return RegSpillOffsets[Reg];
63 } // end namespace llvm