llvm/lib/Target/LoongArch/LoongArchFrameLowering.h

   1 //=- LoongArchFrameLowering.h - TargetFrameLowering for LoongArch -*- 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 LoongArch-specific bits of TargetFrameLowering class.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H
  14 #define LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H
  15
  16 #include "llvm/CodeGen/TargetFrameLowering.h"
  17
  18 namespace llvm {
  19 class LoongArchSubtarget;
  20
  21 class LoongArchFrameLowering : public TargetFrameLowering {
  22   const LoongArchSubtarget &STI;
  23
  24 public:
  25   explicit LoongArchFrameLowering(const LoongArchSubtarget &STI)
  26       : TargetFrameLowering(StackGrowsDown,
  27                             /*StackAlignment=*/Align(16),
  28                             /*LocalAreaOffset=*/0),
  29         STI(STI) {}
  30
  31   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  32   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  33
  34   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
  35                             RegScavenger *RS) const override;
  36
  37   void processFunctionBeforeFrameFinalized(MachineFunction &MF,
  38                                            RegScavenger *RS) const override;
  39
  40   bool hasReservedCallFrame(const MachineFunction &MF) const override;
  41   MachineBasicBlock::iterator
  42   eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
  43                                 MachineBasicBlock::iterator MI) const override;
  44   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  45                                  MachineBasicBlock::iterator MI,
  46                                  ArrayRef<CalleeSavedInfo> CSI,
  47                                  const TargetRegisterInfo *TRI) const override;
  48
  49   StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
  50                                      Register &FrameReg) const override;
  51
  52   bool hasFP(const MachineFunction &MF) const override;
  53   bool hasBP(const MachineFunction &MF) const;
  54
  55   uint64_t getFirstSPAdjustAmount(const MachineFunction &MF) const;
  56
  57   bool enableShrinkWrapping(const MachineFunction &MF) const override;
  58
  59 private:
  60   void determineFrameLayout(MachineFunction &MF) const;
  61   void adjustReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
  62                  const DebugLoc &DL, Register DestReg, Register SrcReg,
  63                  int64_t Val, MachineInstr::MIFlag Flag) const;
  64 };
  65 } // end namespace llvm
  66 #endif // LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H