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 ARM_FRAMEINFO_H
  15 #define ARM_FRAMEINFO_H
  16
  17 #include "ARMSubtarget.h"
  18 #include "llvm/Target/TargetFrameLowering.h"
  19
  20 namespace llvm {
  21   class ARMSubtarget;
  22
  23 class ARMFrameLowering : public TargetFrameLowering {
  24 protected:
  25   const ARMSubtarget &STI;
  26
  27 public:
  28   explicit ARMFrameLowering(const ARMSubtarget &sti)
  29     : TargetFrameLowering(StackGrowsDown, sti.getStackAlignment(), 0, 4),
  30       STI(sti) {
  31   }
  32
  33   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
  34   /// the function.
  35   void emitPrologue(MachineFunction &MF) const override;
  36   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  37
  38   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  39                                  MachineBasicBlock::iterator MI,
  40                                  const std::vector<CalleeSavedInfo> &CSI,
  41                                  const TargetRegisterInfo *TRI) const override;
  42
  43   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
  44                                   MachineBasicBlock::iterator MI,
  45                                   const std::vector<CalleeSavedInfo> &CSI,
  46                                   const TargetRegisterInfo *TRI) 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) const override;
  61
  62  private:
  63   void emitPushInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
  64                     const std::vector<CalleeSavedInfo> &CSI, unsigned StmOpc,
  65                     unsigned StrOpc, bool NoGap,
  66                     bool(*Func)(unsigned, bool), unsigned NumAlignedDPRCS2Regs,
  67                     unsigned MIFlags = 0) const;
  68   void emitPopInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
  69                    const std::vector<CalleeSavedInfo> &CSI, unsigned LdmOpc,
  70                    unsigned LdrOpc, bool isVarArg, bool NoGap,
  71                    bool(*Func)(unsigned, bool),
  72                    unsigned NumAlignedDPRCS2Regs) const;
  73
  74   void
  75   eliminateCallFramePseudoInstr(MachineFunction &MF,
  76                                 MachineBasicBlock &MBB,
  77                                 MachineBasicBlock::iterator MI) const override;
  78 };
  79
  80 } // End llvm namespace
  81
  82 #endif