lib/Target/SystemZ/SystemZFrameLowering.h

   1 //=- SystemZFrameLowering.h - Define frame lowering for z/System -*- 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 SYSTEMZ_FRAMEINFO_H
  15 #define SYSTEMZ_FRAMEINFO_H
  16
  17 #include "SystemZ.h"
  18 #include "SystemZSubtarget.h"
  19 #include "llvm/Target/TargetFrameLowering.h"
  20 #include "llvm/ADT/IndexedMap.h"
  21
  22 namespace llvm {
  23   class SystemZSubtarget;
  24
  25 class SystemZFrameLowering : public TargetFrameLowering {
  26   IndexedMap<unsigned> RegSpillOffsets;
  27 protected:
  28   const SystemZSubtarget &STI;
  29
  30 public:
  31   explicit SystemZFrameLowering(const SystemZSubtarget &sti);
  32
  33   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
  34   /// the function.
  35   void emitPrologue(MachineFunction &MF) const;
  36   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
  37
  38   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  39                                  MachineBasicBlock::iterator MI,
  40                                  const std::vector<CalleeSavedInfo> &CSI,
  41                                  const TargetRegisterInfo *TRI) const;
  42   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
  43                                    MachineBasicBlock::iterator MI,
  44                                    const std::vector<CalleeSavedInfo> &CSI,
  45                                    const TargetRegisterInfo *TRI) const;
  46
  47   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
  48                                             RegScavenger *RS) const;
  49
  50   bool hasReservedCallFrame(const MachineFunction &MF) const { return true; }
  51   bool hasFP(const MachineFunction &MF) const;
  52   int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
  53 };
  54
  55 } // End llvm namespace
  56
  57 #endif