LLVM  9.0.0svn
SparcFrameLowering.h
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1 //===-- SparcFrameLowering.h - Define frame lowering for Sparc --*- 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 //
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_SPARC_SPARCFRAMELOWERING_H
14 #define LLVM_LIB_TARGET_SPARC_SPARCFRAMELOWERING_H
15 
16 #include "Sparc.h"
18 
19 namespace llvm {
20 
21 class SparcSubtarget;
23 public:
24  explicit SparcFrameLowering(const SparcSubtarget &ST);
25 
26  /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
27  /// the function.
28  void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
29  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
30 
33  MachineBasicBlock &MBB,
34  MachineBasicBlock::iterator I) const override;
35 
36  bool hasReservedCallFrame(const MachineFunction &MF) const override;
37  bool hasFP(const MachineFunction &MF) const override;
38  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
39  RegScavenger *RS = nullptr) const override;
40 
41  int getFrameIndexReference(const MachineFunction &MF, int FI,
42  unsigned &FrameReg) const override;
43 
44  /// targetHandlesStackFrameRounding - Returns true if the target is
45  /// responsible for rounding up the stack frame (probably at emitPrologue
46  /// time).
47  bool targetHandlesStackFrameRounding() const override { return true; }
48 
49 private:
50  // Remap input registers to output registers for leaf procedure.
51  void remapRegsForLeafProc(MachineFunction &MF) const;
52 
53  // Returns true if MF is a leaf procedure.
54  bool isLeafProc(MachineFunction &MF) const;
55 
56 
57  // Emits code for adjusting SP in function prologue/epilogue.
58  void emitSPAdjustment(MachineFunction &MF,
59  MachineBasicBlock &MBB,
61  int NumBytes, unsigned ADDrr, unsigned ADDri) const;
62 
63 };
64 
65 } // End llvm namespace
66 
67 #endif
This class represents lattice values for constants.
Definition: AllocatorList.h:23
bool hasFP(const MachineFunction &MF) const override
hasFP - Return true if the specified function should have a dedicated frame pointer register...
int getFrameIndexReference(const MachineFunction &MF, int FI, unsigned &FrameReg) const override
getFrameIndexReference - This method should return the base register and offset used to reference a f...
void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override
bool targetHandlesStackFrameRounding() const override
targetHandlesStackFrameRounding - Returns true if the target is responsible for rounding up the stack...
void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, RegScavenger *RS=nullptr) const override
This method determines which of the registers reported by TargetRegisterInfo::getCalleeSavedRegs() sh...
MachineBasicBlock::iterator eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator I) const override
This method is called during prolog/epilog code insertion to eliminate call frame setup and destroy p...
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.
void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override
emitProlog/emitEpilog - These methods insert prolog and epilog code into the function.
Information about stack frame layout on the target.
SparcFrameLowering(const SparcSubtarget &ST)
#define I(x, y, z)
Definition: MD5.cpp:58