Line data    Source code

       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       12139 :   bool enableShrinkWrapping(const MachineFunction &MF) const override {
      65       12139 :     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