ad4a582fd9
Some targets (e.g. PPC and Hexagon) already did this. I think it's best to do this consistently so that frontend authors don't run into inconsistent results when they emit `naked` functions. For example, in Zig, we had to change our emit code to also set `frame-pointer=none` to get reliable results across targets. Note: I don't have commit access.
77 lines
2.8 KiB
C++
77 lines
2.8 KiB
C++
//===-- CSKYFrameLowering.h - Define frame lowering for CSKY -*- C++ -*--===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This class implements CSKY-specific bits of TargetFrameLowering class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_CSKY_CSKYFRAMELOWERING_H
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#define LLVM_LIB_TARGET_CSKY_CSKYFRAMELOWERING_H
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#include "llvm/CodeGen/TargetFrameLowering.h"
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namespace llvm {
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class CSKYSubtarget;
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class CSKYFrameLowering : public TargetFrameLowering {
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const CSKYSubtarget &STI;
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void determineFrameLayout(MachineFunction &MF) const;
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void adjustReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
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const DebugLoc &DL, Register DestReg, Register SrcReg,
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int64_t Val, MachineInstr::MIFlag Flag) const;
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public:
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explicit CSKYFrameLowering(const CSKYSubtarget &STI)
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: TargetFrameLowering(StackGrowsDown,
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/*StackAlignment=*/Align(4),
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/*LocalAreaOffset=*/0),
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STI(STI) {}
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void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
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void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
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StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
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Register &FrameReg) const override;
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void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
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RegScavenger *RS) const override;
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bool assignCalleeSavedSpillSlots(
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MachineFunction &MF, const TargetRegisterInfo *TRI,
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std::vector<CalleeSavedInfo> &CSI) const override {
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std::reverse(CSI.begin(), CSI.end());
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return false;
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}
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bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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ArrayRef<CalleeSavedInfo> CSI,
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const TargetRegisterInfo *TRI) const override;
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bool
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restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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MutableArrayRef<CalleeSavedInfo> CSI,
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const TargetRegisterInfo *TRI) const override;
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bool hasBP(const MachineFunction &MF) const;
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bool hasReservedCallFrame(const MachineFunction &MF) const override;
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MachineBasicBlock::iterator
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eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const override;
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protected:
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bool hasFPImpl(const MachineFunction &MF) const override;
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};
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} // namespace llvm
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#endif
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