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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
89 lines
3.5 KiB
C++
89 lines
3.5 KiB
C++
//===- Thumb1FrameLowering.h - Thumb1-specific frame info stuff ---*- 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_THUMB1FRAMELOWERING_H
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#define LLVM_LIB_TARGET_ARM_THUMB1FRAMELOWERING_H
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#include "ARMFrameLowering.h"
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namespace llvm {
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class ARMSubtarget;
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class MachineFunction;
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class Thumb1FrameLowering : public ARMFrameLowering {
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public:
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explicit Thumb1FrameLowering(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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const std::vector<CalleeSavedInfo> &CSI,
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const TargetRegisterInfo *TRI) const override;
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bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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std::vector<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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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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/// Check whether or not the given \p MBB can be used as a epilogue
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/// for the target.
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/// The epilogue will be inserted before the first terminator of that block.
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/// This method is used by the shrink-wrapping pass to decide if
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/// \p MBB will be correctly handled by the target.
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bool canUseAsEpilogue(const MachineBasicBlock &MBB) const override;
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/// Disable shrink wrap as tBfar/BL will be used to adjust for long jumps.
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bool enableShrinkWrapping(const MachineFunction &MF) const override {
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return false;
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}
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private:
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/// Check if the frame lowering of \p MF needs a special fixup
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/// code sequence for the epilogue.
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/// Unlike T2 and ARM mode, the T1 pop instruction cannot restore
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/// to LR, and we can't pop the value directly to the PC when
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/// we need to update the SP after popping the value. So instead
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/// we have to emit:
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/// POP {r3}
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/// ADD sp, #offset
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/// BX r3
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/// If this would clobber a return value, then generate this sequence instead:
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/// MOV ip, r3
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/// POP {r3}
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/// ADD sp, #offset
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/// MOV lr, r3
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/// MOV r3, ip
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/// BX lr
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bool needPopSpecialFixUp(const MachineFunction &MF) const;
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/// Emit the special fixup code sequence for the epilogue.
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/// \see needPopSpecialFixUp for more details.
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/// \p DoIt, tells this method whether or not to actually insert
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/// the code sequence in \p MBB. I.e., when \p DoIt is false,
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/// \p MBB is left untouched.
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/// \returns For \p DoIt == true: True when the emission succeeded
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/// false otherwise. For \p DoIt == false: True when the emission
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/// would have been possible, false otherwise.
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bool emitPopSpecialFixUp(MachineBasicBlock &MBB, bool DoIt) const;
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};
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_ARM_THUMB1FRAMELOWERING_H
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