lib/Target/ARC/ARCFrameLowering.h

   1 //===- ARCFrameLowering.h - Define frame lowering for ARC -------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This class implements the ARC specific frame lowering.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_TARGET_ARC_ARCFRAMELOWERING_H
  14 #define LLVM_LIB_TARGET_ARC_ARCFRAMELOWERING_H
  15
  16 #include "ARC.h"
  17 #include "llvm/CodeGen/MachineBasicBlock.h"
  18 #include "llvm/CodeGen/MachineFrameInfo.h"
  19 #include "llvm/CodeGen/TargetFrameLowering.h"
  20
  21 namespace llvm {
  22
  23 class MachineFunction;
  24 class ARCSubtarget;
  25 class ARCInstrInfo;
  26
  27 class ARCFrameLowering : public TargetFrameLowering {
  28 public:
  29   ARCFrameLowering(const ARCSubtarget &st)
  30       : TargetFrameLowering(TargetFrameLowering::StackGrowsDown, 4, 0), ST(st) {
  31   }
  32
  33   /// Insert Prologue into the function.
  34   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  35
  36   /// Insert Epilogue into the function.
  37   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  38
  39   /// Add explicit callee save registers.
  40   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
  41                             RegScavenger *RS) const override;
  42
  43   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  44                                  MachineBasicBlock::iterator MI,
  45                                  const std::vector<CalleeSavedInfo> &CSI,
  46                                  const TargetRegisterInfo *TRI) const override;
  47
  48   bool
  49   restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
  50                               MachineBasicBlock::iterator MI,
  51                               std::vector<CalleeSavedInfo> &CSI,
  52                               const TargetRegisterInfo *TRI) const override;
  53
  54   void processFunctionBeforeFrameFinalized(MachineFunction &MF,
  55                                            RegScavenger *RS) const override;
  56
  57   bool hasFP(const MachineFunction &MF) const override;
  58
  59   MachineBasicBlock::iterator
  60   eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
  61                                 MachineBasicBlock::iterator I) const override;
  62
  63   bool assignCalleeSavedSpillSlots(
  64       llvm::MachineFunction &, const llvm::TargetRegisterInfo *,
  65       std::vector<llvm::CalleeSavedInfo> &) const override;
  66
  67 private:
  68   void adjustStackToMatchRecords(MachineBasicBlock &MBB,
  69                                  MachineBasicBlock::iterator MI,
  70                                  bool allocate) const;
  71
  72   const ARCSubtarget &ST;
  73 };
  74
  75 } // end namespace llvm
  76
  77 #endif // LLVM_LIB_TARGET_ARC_ARCFRAMELOWERING_H