1 //===-- RISCVFrameLowering.h - Define frame lowering for RISCV -*- C++ -*--===//
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
7 //===----------------------------------------------------------------------===//
9 // This class implements RISCV-specific bits of TargetFrameLowering class.
11 //===----------------------------------------------------------------------===//
13 #ifndef LLVM_LIB_TARGET_RISCV_RISCVFRAMELOWERING_H
14 #define LLVM_LIB_TARGET_RISCV_RISCVFRAMELOWERING_H
16 #include "llvm/CodeGen/TargetFrameLowering.h"
21 class RISCVFrameLowering : public TargetFrameLowering {
23 explicit RISCVFrameLowering(const RISCVSubtarget &STI)
24 : TargetFrameLowering(StackGrowsDown,
25 /*StackAlignment=*/Align(16),
26 /*LocalAreaOffset=*/0),
29 void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
30 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
32 int getFrameIndexReference(const MachineFunction &MF, int FI,
33 Register &FrameReg) const override;
35 void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
36 RegScavenger *RS) const override;
38 void processFunctionBeforeFrameFinalized(MachineFunction &MF,
39 RegScavenger *RS) const override;
41 bool hasFP(const MachineFunction &MF) const override;
43 bool hasBP(const MachineFunction &MF) const;
45 bool hasReservedCallFrame(const MachineFunction &MF) const override;
46 MachineBasicBlock::iterator
47 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
48 MachineBasicBlock::iterator MI) const override;
49 bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
50 MachineBasicBlock::iterator MI,
51 ArrayRef<CalleeSavedInfo> CSI,
52 const TargetRegisterInfo *TRI) const override;
54 restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
55 MachineBasicBlock::iterator MI,
56 MutableArrayRef<CalleeSavedInfo> CSI,
57 const TargetRegisterInfo *TRI) const override;
59 // Get the first stack adjustment amount for SplitSPAdjust.
60 // Return 0 if we don't want to to split the SP adjustment in prologue and
62 uint64_t getFirstSPAdjustAmount(const MachineFunction &MF) const;
64 bool canUseAsPrologue(const MachineBasicBlock &MBB) const override;
65 bool canUseAsEpilogue(const MachineBasicBlock &MBB) const override;
68 const RISCVSubtarget &STI;
71 void determineFrameLayout(MachineFunction &MF) const;
72 void adjustReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
73 const DebugLoc &DL, Register DestReg, Register SrcReg,
74 int64_t Val, MachineInstr::MIFlag Flag) const;