contrib/llvm/lib/Target/ARC/ARCFrameLowering.h

   1 //===- ARCFrameLowering.h - Define frame lowering for ARC -------*- 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 class implements the ARC specific frame lowering.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_LIB_TARGET_ARC_ARCFRAMELOWERING_H
  15 #define LLVM_LIB_TARGET_ARC_ARCFRAMELOWERING_H
  16
  17 #include "ARC.h"
  18 #include "llvm/CodeGen/MachineBasicBlock.h"
  19 #include "llvm/CodeGen/MachineFrameInfo.h"
  20 #include "llvm/CodeGen/TargetFrameLowering.h"
  21
  22 namespace llvm {
  23
  24 class MachineFunction;
  25 class ARCSubtarget;
  26 class ARCInstrInfo;
  27
  28 class ARCFrameLowering : public TargetFrameLowering {
  29 public:
  30   ARCFrameLowering(const ARCSubtarget &st)
  31       : TargetFrameLowering(TargetFrameLowering::StackGrowsDown, 4, 0), ST(st) {
  32   }
  33
  34   /// Insert Prologue into the function.
  35   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  36
  37   /// Insert Epilogue into the function.
  38   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  39
  40   /// Add explicit callee save registers.
  41   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
  42                             RegScavenger *RS) const override;
  43
  44   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  45                                  MachineBasicBlock::iterator MI,
  46                                  const std::vector<CalleeSavedInfo> &CSI,
  47                                  const TargetRegisterInfo *TRI) const override;
  48
  49   bool
  50   restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
  51                               MachineBasicBlock::iterator MI,
  52                               std::vector<CalleeSavedInfo> &CSI,
  53                               const TargetRegisterInfo *TRI) const override;
  54
  55   void processFunctionBeforeFrameFinalized(MachineFunction &MF,
  56                                            RegScavenger *RS) const override;
  57
  58   bool hasFP(const MachineFunction &MF) const override;
  59
  60   MachineBasicBlock::iterator
  61   eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
  62                                 MachineBasicBlock::iterator I) const override;
  63
  64   bool assignCalleeSavedSpillSlots(
  65       llvm::MachineFunction &, const llvm::TargetRegisterInfo *,
  66       std::vector<llvm::CalleeSavedInfo> &) const override;
  67
  68 private:
  69   void adjustStackToMatchRecords(MachineBasicBlock &MBB,
  70                                  MachineBasicBlock::iterator MI,
  71                                  bool allocate) const;
  72
  73   const ARCSubtarget &ST;
  74 };
  75
  76 } // end namespace llvm
  77
  78 #endif // LLVM_LIB_TARGET_ARC_ARCFRAMELOWERING_H