lib/Target/ARM/ARMFrameLowering.h

   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 } // namespace llvm
  82
  83 #endif