1 //==-- ARMTargetFrameLowering.h - Define frame lowering for ARM --*- 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 //===----------------------------------------------------------------------===//
9 //
10 //
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H
15 #define LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H
16 
17 #include "llvm/Target/TargetFrameLowering.h"
18 
19 namespace llvm {
20   class ARMSubtarget;
21 
22 class ARMFrameLowering : public TargetFrameLowering {
23 protected:
24   const ARMSubtarget &STI;
25 
26 public:
27   explicit ARMFrameLowering(const ARMSubtarget &sti);
28 
29   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
30   /// the function.
31   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
32   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
33 
34   void fixTCReturn(MachineFunction &MF, MachineBasicBlock &MBB) const;
35 
36   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
37                                  MachineBasicBlock::iterator MI,
38                                  const std::vector<CalleeSavedInfo> &CSI,
39                                  const TargetRegisterInfo *TRI) const override;
40 
41   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
42                                   MachineBasicBlock::iterator MI,
43                                   const std::vector<CalleeSavedInfo> &CSI,
44                                   const TargetRegisterInfo *TRI) const override;
45 
46   bool noFramePointerElim(const MachineFunction &MF) const override;
47 
48   bool hasFP(const MachineFunction &MF) const override;
49   bool hasReservedCallFrame(const MachineFunction &MF) const override;
50   bool canSimplifyCallFramePseudos(const MachineFunction &MF) const override;
51   int getFrameIndexReference(const MachineFunction &MF, int FI,
52                              unsigned &FrameReg) const override;
53   int ResolveFrameIndexReference(const MachineFunction &MF, int FI,
54                                  unsigned &FrameReg, int SPAdj) const;
55   int getFrameIndexOffset(const MachineFunction &MF, int FI) const override;
56 
57   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
58                                             RegScavenger *RS) const override;
59 
60   void adjustForSegmentedStacks(MachineFunction &MF,
61                                 MachineBasicBlock &MBB) const override;
62 
63  private:
64   void emitPushInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
65                     const std::vector<CalleeSavedInfo> &CSI, unsigned StmOpc,
66                     unsigned StrOpc, bool NoGap,
67                     bool(*Func)(unsigned, bool), unsigned NumAlignedDPRCS2Regs,
68                     unsigned MIFlags = 0) const;
69   void emitPopInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
70                    const std::vector<CalleeSavedInfo> &CSI, unsigned LdmOpc,
71                    unsigned LdrOpc, bool isVarArg, bool NoGap,
72                    bool(*Func)(unsigned, bool),
73                    unsigned NumAlignedDPRCS2Regs) const;
74 
75   void
76   eliminateCallFramePseudoInstr(MachineFunction &MF,
77                                 MachineBasicBlock &MBB,
78                                 MachineBasicBlock::iterator MI) const override;
79 };
80 
81 } // End llvm namespace
82 
83 #endif
84