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 #ifndef LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H
  11 #define LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H
  12
  13 #include "llvm/CodeGen/MachineBasicBlock.h"
  14 #include "llvm/CodeGen/TargetFrameLowering.h"
  15 #include <vector>
  16
  17 namespace llvm {
  18
  19 class ARMSubtarget;
  20 class CalleeSavedInfo;
  21 class MachineFunction;
  22
  23 class ARMFrameLowering : public TargetFrameLowering {
  24 protected:
  25   const ARMSubtarget &STI;
  26
  27 public:
  28   explicit ARMFrameLowering(const ARMSubtarget &sti);
  29
  30   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
  31   /// the function.
  32   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  33   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  34
  35   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  36                                  MachineBasicBlock::iterator MI,
  37                                  const std::vector<CalleeSavedInfo> &CSI,
  38                                  const TargetRegisterInfo *TRI) const override;
  39
  40   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
  41                                   MachineBasicBlock::iterator MI,
  42                                   std::vector<CalleeSavedInfo> &CSI,
  43                                   const TargetRegisterInfo *TRI) const override;
  44
  45   bool noFramePointerElim(const MachineFunction &MF) const override;
  46
  47   bool enableCalleeSaveSkip(const MachineFunction &MF) const override;
  48
  49   bool hasFP(const MachineFunction &MF) const override;
  50   bool hasReservedCallFrame(const MachineFunction &MF) const override;
  51   bool canSimplifyCallFramePseudos(const MachineFunction &MF) const override;
  52   int getFrameIndexReference(const MachineFunction &MF, int FI,
  53                              unsigned &FrameReg) const override;
  54   int ResolveFrameIndexReference(const MachineFunction &MF, int FI,
  55                                  unsigned &FrameReg, int SPAdj) const;
  56
  57   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
  58                             RegScavenger *RS) const override;
  59
  60   void adjustForSegmentedStacks(MachineFunction &MF,
  61                                 MachineBasicBlock &MBB) const override;
  62
  63   /// Returns true if the target will correctly handle shrink wrapping.
  64   bool enableShrinkWrapping(const MachineFunction &MF) const override {
  65     return true;
  66   }
  67
  68 private:
  69   void emitPushInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
  70                     const std::vector<CalleeSavedInfo> &CSI, unsigned StmOpc,
  71                     unsigned StrOpc, bool NoGap,
  72                     bool(*Func)(unsigned, bool), unsigned NumAlignedDPRCS2Regs,
  73                     unsigned MIFlags = 0) const;
  74   void emitPopInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
  75                    std::vector<CalleeSavedInfo> &CSI, unsigned LdmOpc,
  76                    unsigned LdrOpc, bool isVarArg, bool NoGap,
  77                    bool(*Func)(unsigned, bool),
  78                    unsigned NumAlignedDPRCS2Regs) const;
  79
  80   MachineBasicBlock::iterator
  81   eliminateCallFramePseudoInstr(MachineFunction &MF,
  82                                 MachineBasicBlock &MBB,
  83                                 MachineBasicBlock::iterator MI) const override;
  84 };
  85
  86 } // end namespace llvm
  87
  88 #endif // LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H