mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 12:12:47 +01:00
f478403d71
restoreCalleeSavedRegisters can mutate the contents of the CalleeSavedInfos, so use a MutableArrayRef.
90 lines
3.5 KiB
C++
90 lines
3.5 KiB
C++
//===- Thumb1FrameLowering.h - Thumb1-specific frame info stuff ---*- 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_THUMB1FRAMELOWERING_H
|
|
#define LLVM_LIB_TARGET_ARM_THUMB1FRAMELOWERING_H
|
|
|
|
#include "ARMFrameLowering.h"
|
|
|
|
namespace llvm {
|
|
|
|
class ARMSubtarget;
|
|
class MachineFunction;
|
|
|
|
class Thumb1FrameLowering : public ARMFrameLowering {
|
|
public:
|
|
explicit Thumb1FrameLowering(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 hasReservedCallFrame(const MachineFunction &MF) const override;
|
|
|
|
MachineBasicBlock::iterator
|
|
eliminateCallFramePseudoInstr(MachineFunction &MF,
|
|
MachineBasicBlock &MBB,
|
|
MachineBasicBlock::iterator MI) const override;
|
|
|
|
/// Check whether or not the given \p MBB can be used as a epilogue
|
|
/// for the target.
|
|
/// The epilogue will be inserted before the first terminator of that block.
|
|
/// This method is used by the shrink-wrapping pass to decide if
|
|
/// \p MBB will be correctly handled by the target.
|
|
bool canUseAsEpilogue(const MachineBasicBlock &MBB) const override;
|
|
|
|
/// Disable shrink wrap as tBfar/BL will be used to adjust for long jumps.
|
|
bool enableShrinkWrapping(const MachineFunction &MF) const override {
|
|
return false;
|
|
}
|
|
|
|
private:
|
|
/// Check if the frame lowering of \p MF needs a special fixup
|
|
/// code sequence for the epilogue.
|
|
/// Unlike T2 and ARM mode, the T1 pop instruction cannot restore
|
|
/// to LR, and we can't pop the value directly to the PC when
|
|
/// we need to update the SP after popping the value. So instead
|
|
/// we have to emit:
|
|
/// POP {r3}
|
|
/// ADD sp, #offset
|
|
/// BX r3
|
|
/// If this would clobber a return value, then generate this sequence instead:
|
|
/// MOV ip, r3
|
|
/// POP {r3}
|
|
/// ADD sp, #offset
|
|
/// MOV lr, r3
|
|
/// MOV r3, ip
|
|
/// BX lr
|
|
bool needPopSpecialFixUp(const MachineFunction &MF) const;
|
|
|
|
/// Emit the special fixup code sequence for the epilogue.
|
|
/// \see needPopSpecialFixUp for more details.
|
|
/// \p DoIt, tells this method whether or not to actually insert
|
|
/// the code sequence in \p MBB. I.e., when \p DoIt is false,
|
|
/// \p MBB is left untouched.
|
|
/// \returns For \p DoIt == true: True when the emission succeeded
|
|
/// false otherwise. For \p DoIt == false: True when the emission
|
|
/// would have been possible, false otherwise.
|
|
bool emitPopSpecialFixUp(MachineBasicBlock &MBB, bool DoIt) const;
|
|
};
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif // LLVM_LIB_TARGET_ARM_THUMB1FRAMELOWERING_H
|