LLVM  8.0.0svn
Go to the documentation of this file.
1 //===-- SystemZFrameLowering.h - Frame lowering for SystemZ -----*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
13 #include "llvm/ADT/IndexedMap.h"
16 namespace llvm {
17 class SystemZTargetMachine;
18 class SystemZSubtarget;
21  IndexedMap<unsigned> RegSpillOffsets;
23 public:
26  // Override TargetFrameLowering.
27  bool isFPCloseToIncomingSP() const override { return false; }
28  const SpillSlot *getCalleeSavedSpillSlots(unsigned &NumEntries) const
29  override;
30  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
31  RegScavenger *RS) const override;
34  const std::vector<CalleeSavedInfo> &CSI,
35  const TargetRegisterInfo *TRI) const override;
38  std::vector<CalleeSavedInfo> &CSI,
39  const TargetRegisterInfo *TRI) const
40  override;
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  bool hasReservedCallFrame(const MachineFunction &MF) const override;
49  MachineBasicBlock::iterator MI) const override;
51  // Return the byte offset from the incoming stack pointer of Reg's
52  // ABI-defined save slot. Return 0 if no slot is defined for Reg.
53  unsigned getRegSpillOffset(unsigned Reg) const {
54  return RegSpillOffsets[Reg];
55  }
56 };
57 } // end namespace llvm
59 #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:24
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...