lib/Target/SystemZ/SystemZRegisterInfo.h

   1 //===- SystemZRegisterInfo.h - SystemZ 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 SystemZ implementation of the TargetRegisterInfo class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef SystemZREGISTERINFO_H
  15 #define SystemZREGISTERINFO_H
  16
  17 #include "llvm/Target/TargetRegisterInfo.h"
  18 #include "SystemZGenRegisterInfo.h.inc"
  19
  20 namespace llvm {
  21
  22 namespace SystemZ {
  23   /// SubregIndex - The index of various sized subregister classes. Note that
  24   /// these indices must be kept in sync with the class indices in the
  25   /// SystemZRegisterInfo.td file.
  26   enum SubregIndex {
  27     SUBREG_32BIT = 1, SUBREG_EVEN = 1, SUBREG_ODD = 2
  28   };
  29 }
  30
  31 class SystemZSubtarget;
  32 class SystemZInstrInfo;
  33 class Type;
  34
  35 struct SystemZRegisterInfo : public SystemZGenRegisterInfo {
  36   SystemZTargetMachine &TM;
  37   const SystemZInstrInfo &TII;
  38
  39   SystemZRegisterInfo(SystemZTargetMachine &tm, const SystemZInstrInfo &tii);
  40
  41   /// Code Generation virtual methods...
  42   const unsigned *getCalleeSavedRegs(const MachineFunction *MF = 0) const;
  43
  44   const TargetRegisterClass* const* getCalleeSavedRegClasses(
  45                                      const MachineFunction *MF = 0) const;
  46
  47   BitVector getReservedRegs(const MachineFunction &MF) const;
  48
  49   bool hasReservedCallFrame(MachineFunction &MF) const { return true; }
  50   bool hasFP(const MachineFunction &MF) const;
  51
  52   int getFrameIndexOffset(MachineFunction &MF, int FI) const;
  53
  54   void eliminateCallFramePseudoInstr(MachineFunction &MF,
  55                                      MachineBasicBlock &MBB,
  56                                      MachineBasicBlock::iterator I) const;
  57
  58   void eliminateFrameIndex(MachineBasicBlock::iterator II,
  59                            int SPAdj, RegScavenger *RS = NULL) const;
  60
  61
  62   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
  63                                             RegScavenger *RS) const;
  64
  65   void emitPrologue(MachineFunction &MF) const;
  66   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
  67
  68   // Debug information queries.
  69   unsigned getRARegister() const;
  70   unsigned getFrameRegister(MachineFunction &MF) const;
  71
  72   // Exception handling queries.
  73   unsigned getEHExceptionRegister() const;
  74   unsigned getEHHandlerRegister() const;
  75
  76   int getDwarfRegNum(unsigned RegNum, bool isEH) const;
  77 };
  78
  79 } // end namespace llvm
  80
  81 #endif