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To accommodate frame layouts that have both fixed and scalable objects on the stack, describing a stack location or offset using a pointer + uint64_t is not sufficient. For this reason, we've introduced the StackOffset class, which models both the fixed- and scalable sized offsets. The TargetFrameLowering::getFrameIndexReference is made to return a StackOffset, so that this can be used in other interfaces, such as to eliminate frame indices in PEI or to emit Debug locations for variables on the stack. This patch is purely mechanical and doesn't change the behaviour of how the result of this function is used for fixed-sized offsets. The patch adds various checks to assert that the offset has no scalable component, as frame offsets with a scalable component are not yet supported in various places. Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D90018
54 lines
1.9 KiB
C++
54 lines
1.9 KiB
C++
//===- MipsSEFrameLowering.h - Mips32/64 frame lowering ---------*- 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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#ifndef LLVM_LIB_TARGET_MIPS_MIPSSEFRAMELOWERING_H
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#define LLVM_LIB_TARGET_MIPS_MIPSSEFRAMELOWERING_H
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#include "MipsFrameLowering.h"
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#include "llvm/Support/TypeSize.h"
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#include <vector>
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namespace llvm {
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class MachineBasicBlock;
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class MachineFunction;
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class MipsSubtarget;
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class MipsSEFrameLowering : public MipsFrameLowering {
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public:
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explicit MipsSEFrameLowering(const MipsSubtarget &STI);
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/// emitProlog/emitEpilog - These methods insert prolog and epilog code into
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/// the function.
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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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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 hasReservedCallFrame(const MachineFunction &MF) const override;
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void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
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RegScavenger *RS) const override;
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private:
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void emitInterruptEpilogueStub(MachineFunction &MF,
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MachineBasicBlock &MBB) const;
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void emitInterruptPrologueStub(MachineFunction &MF,
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MachineBasicBlock &MBB) const;
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};
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_MIPS_MIPSSEFRAMELOWERING_H
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