lib/Target/ARM/ARMRegisterInfo.h

   1 //===- ARMRegisterInfo.h - ARM Register Information Impl --------*- 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 // This file contains the ARM implementation of the MRegisterInfo class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef ARMREGISTERINFO_H
  15 #define ARMREGISTERINFO_H
  16
  17 #include "llvm/Target/MRegisterInfo.h"
  18 #include "ARMGenRegisterInfo.h.inc"
  19
  20 namespace llvm {
  21   class ARMSubtarget;
  22   class TargetInstrInfo;
  23   class Type;
  24
  25 struct ARMRegisterInfo : public ARMGenRegisterInfo {
  26   const TargetInstrInfo &TII;
  27   const ARMSubtarget &STI;
  28 private:
  29   /// FramePtr - ARM physical register used as frame ptr.
  30   unsigned FramePtr;
  31
  32 public:
  33   ARMRegisterInfo(const TargetInstrInfo &tii, const ARMSubtarget &STI);
  34
  35   /// getRegisterNumbering - Given the enum value for some register, e.g.
  36   /// ARM::LR, return the number that it corresponds to (e.g. 14).
  37   static unsigned getRegisterNumbering(unsigned RegEnum);
  38
  39   /// Code Generation virtual methods...
  40   void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
  41                      unsigned DestReg, const MachineInstr *Orig) const;
  42
  43   const unsigned *getCalleeSavedRegs(const MachineFunction *MF = 0) const;
  44
  45   const TargetRegisterClass* const*
  46   getCalleeSavedRegClasses(const MachineFunction *MF = 0) const;
  47
  48   BitVector getReservedRegs(const MachineFunction &MF) const;
  49
  50   bool isReservedReg(const MachineFunction &MF, unsigned Reg) const;
  51
  52   bool requiresRegisterScavenging(const MachineFunction &MF) const;
  53
  54   bool hasFP(const MachineFunction &MF) const;
  55
  56   bool hasReservedCallFrame(MachineFunction &MF) const;
  57
  58   void eliminateCallFramePseudoInstr(MachineFunction &MF,
  59                                      MachineBasicBlock &MBB,
  60                                      MachineBasicBlock::iterator I) const;
  61
  62   void eliminateFrameIndex(MachineBasicBlock::iterator II,
  63                            int SPAdj, RegScavenger *RS = NULL) const;
  64
  65   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
  66                                             RegScavenger *RS = NULL) const;
  67
  68   void emitPrologue(MachineFunction &MF) const;
  69   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
  70
  71   // Debug information queries.
  72   unsigned getRARegister() const;
  73   unsigned getFrameRegister(MachineFunction &MF) const;
  74
  75   // Exception handling queries.
  76   unsigned getEHExceptionRegister() const;
  77   unsigned getEHHandlerRegister() const;
  78
  79   int getDwarfRegNum(unsigned RegNum, bool isEH) const;
  80
  81   bool isLowRegister(unsigned Reg) const;
  82 };
  83
  84 } // end namespace llvm
  85
  86 #endif