LLVM  10.0.0svn
SystemZFrameLowering.h
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1 //===-- SystemZFrameLowering.h - Frame lowering for SystemZ -----*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZFRAMELOWERING_H
10 #define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZFRAMELOWERING_H
11 
12 #include "llvm/ADT/IndexedMap.h"
14 
15 namespace llvm {
16 class SystemZTargetMachine;
17 class SystemZSubtarget;
18 
20  IndexedMap<unsigned> RegSpillOffsets;
21 
22 public:
24 
25  // Override TargetFrameLowering.
26  bool isFPCloseToIncomingSP() const override { return false; }
27  const SpillSlot *getCalleeSavedSpillSlots(unsigned &NumEntries) const
28  override;
29  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
30  RegScavenger *RS) const override;
33  const std::vector<CalleeSavedInfo> &CSI,
34  const TargetRegisterInfo *TRI) const override;
37  std::vector<CalleeSavedInfo> &CSI,
38  const TargetRegisterInfo *TRI) const
39  override;
41  RegScavenger *RS) const override;
42  void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
43  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
44  bool hasFP(const MachineFunction &MF) const override;
45  bool hasReservedCallFrame(const MachineFunction &MF) const override;
48  MachineBasicBlock::iterator MI) const override;
49 
50  // Return the byte offset from the incoming stack pointer of Reg's
51  // ABI-defined save slot. Return 0 if no slot is defined for Reg.
52  unsigned getRegSpillOffset(unsigned Reg) const {
53  return RegSpillOffsets[Reg];
54  }
55 };
56 } // end namespace llvm
57 
58 #endif
bool hasFP(const MachineFunction &MF) const override
hasFP - Return true if the specified function should have a dedicated frame pointer register...
This class represents lattice values for constants.
Definition: AllocatorList.h:23
void processFunctionBeforeFrameFinalized(MachineFunction &MF, RegScavenger *RS) const override
processFunctionBeforeFrameFinalized - This method is called immediately before the specified function...
unsigned Reg
bool hasReservedCallFrame(const MachineFunction &MF) const override
hasReservedCallFrame - Under normal circumstances, when a frame pointer is not required, we reserve argument space for call sites in the function immediately on entry to the current function.
unsigned const TargetRegisterInfo * TRI
bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBII, std::vector< CalleeSavedInfo > &CSI, const TargetRegisterInfo *TRI) const override
restoreCalleeSavedRegisters - Issues instruction(s) to restore all callee saved registers and returns...
unsigned getRegSpillOffset(unsigned Reg) const
void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, RegScavenger *RS) const override
This method determines which of the registers reported by TargetRegisterInfo::getCalleeSavedRegs() sh...
MachineBasicBlock::iterator eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MI) const override
This method is called during prolog/epilog code insertion to eliminate call frame setup and destroy p...
void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override
void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override
emitProlog/emitEpilog - These methods insert prolog and epilog code into the function.
TargetRegisterInfo base class - We assume that the target defines a static array of TargetRegisterDes...
bool isFPCloseToIncomingSP() const override
isFPCloseToIncomingSP - Return true if the frame pointer is close to the incoming stack pointer...
Information about stack frame layout on the target.
const SpillSlot * getCalleeSavedSpillSlots(unsigned &NumEntries) const override
getCalleeSavedSpillSlots - This method returns a pointer to an array of pairs, that contains an entry...
IRTranslator LLVM IR MI
bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const std::vector< CalleeSavedInfo > &CSI, const TargetRegisterInfo *TRI) const override
spillCalleeSavedRegisters - Issues instruction(s) to spill all callee saved registers and returns tru...