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 "ARM.h"
  18 #include "ARMSubtarget.h"
  19 #include "llvm/Target/TargetFrameLowering.h"
  20
  21 namespace llvm {
  22   class ARMSubtarget;
  23
  24 class ARMFrameLowering : public TargetFrameLowering {
  25 protected:
  26   const ARMSubtarget &STI;
  27
  28 public:
  29   explicit ARMFrameLowering(const ARMSubtarget &sti)
  30     : TargetFrameLowering(StackGrowsDown, sti.getStackAlignment(), 0, 4),
  31       STI(sti) {
  32   }
  33
  34   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
  35   /// the function.
  36   void emitPrologue(MachineFunction &MF) const;
  37   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
  38
  39   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  40                                  MachineBasicBlock::iterator MI,
  41                                  const std::vector<CalleeSavedInfo> &CSI,
  42                                  const TargetRegisterInfo *TRI) const;
  43
  44   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
  45                                    MachineBasicBlock::iterator MI,
  46                                    const std::vector<CalleeSavedInfo> &CSI,
  47                                    const TargetRegisterInfo *TRI) const;
  48
  49   bool hasFP(const MachineFunction &MF) const;
  50   bool hasReservedCallFrame(const MachineFunction &MF) const;
  51   bool canSimplifyCallFramePseudos(const MachineFunction &MF) const;
  52   int getFrameIndexReference(const MachineFunction &MF, int FI,
  53                              unsigned &FrameReg) const;
  54   int ResolveFrameIndexReference(const MachineFunction &MF, int FI,
  55                                  unsigned &FrameReg, int SPAdj) const;
  56   int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
  57
  58   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
  59                                             RegScavenger *RS) const;
  60
  61  private:
  62   void emitPushInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
  63                     const std::vector<CalleeSavedInfo> &CSI, unsigned StmOpc,
  64                     unsigned StrOpc, bool NoGap,
  65                     bool(*Func)(unsigned, bool),
  66                     unsigned MIFlags = 0) const;
  67   void emitPopInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
  68                    const std::vector<CalleeSavedInfo> &CSI, unsigned LdmOpc,
  69                    unsigned LdrOpc, bool isVarArg, bool NoGap,
  70                    bool(*Func)(unsigned, bool)) const;
  71 };
  72
  73 } // End llvm namespace
  74
  75 #endif