llvm/lib/Target/CSKY/CSKYFrameLowering.h

   1 //===-- CSKYFrameLowering.h - Define frame lowering for CSKY -*- 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 CSKY-specific bits of TargetFrameLowering class.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_TARGET_CSKY_CSKYFRAMELOWERING_H
  14 #define LLVM_LIB_TARGET_CSKY_CSKYFRAMELOWERING_H
  15
  16 #include "llvm/CodeGen/TargetFrameLowering.h"
  17
  18 namespace llvm {
  19 class CSKYSubtarget;
  20
  21 class CSKYFrameLowering : public TargetFrameLowering {
  22   const CSKYSubtarget &STI;
  23
  24   void determineFrameLayout(MachineFunction &MF) const;
  25   void adjustReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
  26                  const DebugLoc &DL, Register DestReg, Register SrcReg,
  27                  int64_t Val, MachineInstr::MIFlag Flag) const;
  28
  29 public:
  30   explicit CSKYFrameLowering(const CSKYSubtarget &STI)
  31       : TargetFrameLowering(StackGrowsDown,
  32                             /*StackAlignment=*/Align(4),
  33                             /*LocalAreaOffset=*/0),
  34         STI(STI) {}
  35
  36   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  37   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  38
  39   StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
  40                                      Register &FrameReg) const override;
  41
  42   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
  43                             RegScavenger *RS) const override;
  44
  45   bool assignCalleeSavedSpillSlots(
  46       MachineFunction &MF, const TargetRegisterInfo *TRI,
  47       std::vector<CalleeSavedInfo> &CSI) const override {
  48
  49     std::reverse(CSI.begin(), CSI.end());
  50
  51     return false;
  52   }
  53
  54   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  55                                  MachineBasicBlock::iterator MI,
  56                                  ArrayRef<CalleeSavedInfo> CSI,
  57                                  const TargetRegisterInfo *TRI) const override;
  58   bool
  59   restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
  60                               MachineBasicBlock::iterator MI,
  61                               MutableArrayRef<CalleeSavedInfo> CSI,
  62                               const TargetRegisterInfo *TRI) const override;
  63
  64   bool hasBP(const MachineFunction &MF) const;
  65
  66   bool hasReservedCallFrame(const MachineFunction &MF) const override;
  67
  68   MachineBasicBlock::iterator
  69   eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
  70                                 MachineBasicBlock::iterator MI) const override;
  71
  72 protected:
  73   bool hasFPImpl(const MachineFunction &MF) const override;
  74 };
  75 } // namespace llvm
  76 #endif