lib/Target/PowerPC/PPCRegisterInfo.h

   1 //===- PPCRegisterInfo.h - PowerPC 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 PowerPC implementation of the TargetRegisterInfo
  11 // class.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef POWERPC32_REGISTERINFO_H
  16 #define POWERPC32_REGISTERINFO_H
  17
  18 #include "PPC.h"
  19 #include "PPCGenRegisterInfo.h.inc"
  20 #include <map>
  21
  22 namespace llvm {
  23 class PPCSubtarget;
  24 class TargetInstrInfo;
  25 class Type;
  26
  27 class PPCRegisterInfo : public PPCGenRegisterInfo {
  28   std::map<unsigned, unsigned> ImmToIdxMap;
  29   const PPCSubtarget &Subtarget;
  30   const TargetInstrInfo &TII;
  31 public:
  32   PPCRegisterInfo(const PPCSubtarget &SubTarget, const TargetInstrInfo &tii);
  33
  34   /// getRegisterNumbering - Given the enum value for some register, e.g.
  35   /// PPC::F14, return the number that it corresponds to (e.g. 14).
  36   static unsigned getRegisterNumbering(unsigned RegEnum);
  37
  38   /// getPointerRegClass - Return the register class to use to hold pointers.
  39   /// This is used for addressing modes.
  40   virtual const TargetRegisterClass *getPointerRegClass() const;
  41
  42   /// Code Generation virtual methods...
  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   /// targetHandlesStackFrameRounding - Returns true if the target is
  51   /// responsible for rounding up the stack frame (probably at emitPrologue
  52   /// time).
  53   bool targetHandlesStackFrameRounding() const { return true; }
  54
  55   /// requiresRegisterScavenging - We require a register scavenger.
  56   /// FIXME (64-bit): Should be inlined.
  57   bool requiresRegisterScavenging(const MachineFunction &MF) const;
  58
  59   bool hasFP(const MachineFunction &MF) const;
  60
  61   void eliminateCallFramePseudoInstr(MachineFunction &MF,
  62                                      MachineBasicBlock &MBB,
  63                                      MachineBasicBlock::iterator I) const;
  64
  65   void lowerDynamicAlloc(MachineBasicBlock::iterator II,
  66                          int SPAdj, RegScavenger *RS) const;
  67   void lowerCRSpilling(MachineBasicBlock::iterator II, unsigned FrameIndex,
  68                        int SPAdj, RegScavenger *RS) const;
  69   void eliminateFrameIndex(MachineBasicBlock::iterator II,
  70                            int SPAdj, RegScavenger *RS = NULL) const;
  71
  72   /// determineFrameLayout - Determine the size of the frame and maximum call
  73   /// frame size.
  74   void determineFrameLayout(MachineFunction &MF) const;
  75
  76   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
  77                                             RegScavenger *RS = NULL) const;
  78   void emitPrologue(MachineFunction &MF) const;
  79   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
  80
  81   // Debug information queries.
  82   unsigned getRARegister() const;
  83   unsigned getFrameRegister(MachineFunction &MF) const;
  84   void getInitialFrameState(std::vector<MachineMove> &Moves) const;
  85
  86   // Exception handling queries.
  87   unsigned getEHExceptionRegister() const;
  88   unsigned getEHHandlerRegister() const;
  89
  90   int getDwarfRegNum(unsigned RegNum, bool isEH) const;
  91 };
  92
  93 } // end namespace llvm
  94
  95 #endif