101 lines
4.1 KiB
C++
101 lines
4.1 KiB
C++
//===- ARMTargetFrameLowering.h - Define frame lowering for ARM -*- 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_ARM_ARMFRAMELOWERING_H
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#define LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H
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#include "llvm/CodeGen/TargetFrameLowering.h"
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#include "llvm/Support/TypeSize.h"
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namespace llvm {
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class ARMSubtarget;
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class CalleeSavedInfo;
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class MachineFunction;
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class ARMFrameLowering : public TargetFrameLowering {
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protected:
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const ARMSubtarget &STI;
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public:
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explicit ARMFrameLowering(const ARMSubtarget &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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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 keepFramePointer(const MachineFunction &MF) const override;
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bool enableCalleeSaveSkip(const MachineFunction &MF) const override;
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bool hasFP(const MachineFunction &MF) const override;
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bool hasReservedCallFrame(const MachineFunction &MF) const override;
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bool canSimplifyCallFramePseudos(const MachineFunction &MF) 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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int ResolveFrameIndexReference(const MachineFunction &MF, int FI,
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Register &FrameReg, int SPAdj) const;
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void getCalleeSaves(const MachineFunction &MF,
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BitVector &SavedRegs) const override;
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void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
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RegScavenger *RS) const override;
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void adjustForSegmentedStacks(MachineFunction &MF,
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MachineBasicBlock &MBB) const override;
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/// Returns true if the target will correctly handle shrink wrapping.
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bool enableShrinkWrapping(const MachineFunction &MF) const override;
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bool isProfitableForNoCSROpt(const Function &F) const override {
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// The no-CSR optimisation is bad for code size on ARM, because we can save
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// many registers with a single PUSH/POP pair.
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return false;
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}
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bool
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assignCalleeSavedSpillSlots(MachineFunction &MF,
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const TargetRegisterInfo *TRI,
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std::vector<CalleeSavedInfo> &CSI) const override;
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const SpillSlot *
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getCalleeSavedSpillSlots(unsigned &NumEntries) const override;
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private:
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void emitPushInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
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ArrayRef<CalleeSavedInfo> CSI, unsigned StmOpc,
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unsigned StrOpc, bool NoGap, bool (*Func)(unsigned, bool),
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unsigned NumAlignedDPRCS2Regs, unsigned MIFlags = 0) const;
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void emitPopInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
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MutableArrayRef<CalleeSavedInfo> CSI, unsigned LdmOpc,
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unsigned LdrOpc, bool isVarArg, bool NoGap,
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bool (*Func)(unsigned, bool),
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unsigned NumAlignedDPRCS2Regs) const;
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MachineBasicBlock::iterator
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eliminateCallFramePseudoInstr(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const override;
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};
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H
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