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//===- ARMTargetFrameLowering.h - Define frame lowering for ARM -*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H
#define LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H
#include "llvm/CodeGen/TargetFrameLowering.h"
#include "llvm/Support/TypeSize.h"
namespace llvm {
class ARMSubtarget;
class CalleeSavedInfo;
class MachineFunction;
class ARMFrameLowering : public TargetFrameLowering {
protected:
const ARMSubtarget &STI;
public:
explicit ARMFrameLowering(const ARMSubtarget &sti);
/// emitProlog/emitEpilog - These methods insert prolog and epilog code into
/// the function.
void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
ArrayRef<CalleeSavedInfo> CSI,
const TargetRegisterInfo *TRI) const override;
bool
restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
MutableArrayRef<CalleeSavedInfo> CSI,
const TargetRegisterInfo *TRI) const override;
bool keepFramePointer(const MachineFunction &MF) const override;
bool enableCalleeSaveSkip(const MachineFunction &MF) const override;
bool hasFP(const MachineFunction &MF) const override;
bool isFPReserved(const MachineFunction &MF) const;
bool hasReservedCallFrame(const MachineFunction &MF) const override;
bool canSimplifyCallFramePseudos(const MachineFunction &MF) const override;
StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
Register &FrameReg) const override;
int ResolveFrameIndexReference(const MachineFunction &MF, int FI,
Register &FrameReg, int SPAdj) const;
void getCalleeSaves(const MachineFunction &MF,
BitVector &SavedRegs) const override;
void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
RegScavenger *RS) const override;
/// Update the IsRestored flag on LR if it is spilled, based on the return
/// instructions.
static void updateLRRestored(MachineFunction &MF);
void processFunctionBeforeFrameFinalized(
MachineFunction &MF, RegScavenger *RS = nullptr) const override;
void adjustForSegmentedStacks(MachineFunction &MF,
MachineBasicBlock &MBB) const override;
/// Returns true if the target will correctly handle shrink wrapping.
bool enableShrinkWrapping(const MachineFunction &MF) const override;
bool isProfitableForNoCSROpt(const Function &F) const override {
// The no-CSR optimisation is bad for code size on ARM, because we can save
// many registers with a single PUSH/POP pair.
return false;
}
bool
assignCalleeSavedSpillSlots(MachineFunction &MF,
const TargetRegisterInfo *TRI,
std::vector<CalleeSavedInfo> &CSI) const override;
const SpillSlot *
getCalleeSavedSpillSlots(unsigned &NumEntries) const override;
private:
void emitPushInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
ArrayRef<CalleeSavedInfo> CSI, unsigned StmOpc,
unsigned StrOpc, bool NoGap, bool (*Func)(unsigned, bool),
unsigned NumAlignedDPRCS2Regs, unsigned MIFlags = 0) const;
void emitPopInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
MutableArrayRef<CalleeSavedInfo> CSI, unsigned LdmOpc,
unsigned LdrOpc, bool isVarArg, bool NoGap,
bool (*Func)(unsigned, bool),
unsigned NumAlignedDPRCS2Regs) const;
MachineBasicBlock::iterator
eliminateCallFramePseudoInstr(MachineFunction &MF,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI) const override;
};
} // end namespace llvm
#endif // LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H
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