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39dd827634
- New function SDValue getBackchainAddress() used by lowerDYNAMIC_STACKALLOC() and lowerSTACKRESTORE() to properly handle the backchain offset also with packed-stack. - Make a common function getBackchainOffset() for the computation of the backchain offset and use in some places (NFC). Review: Ulrich Weigand Differential Revision: https://reviews.llvm.org/D93171
77 lines
3.3 KiB
C++
77 lines
3.3 KiB
C++
//===-- SystemZFrameLowering.h - Frame lowering for SystemZ -----*- 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_SYSTEMZ_SYSTEMZFRAMELOWERING_H
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#define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZFRAMELOWERING_H
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#include "MCTargetDesc/SystemZMCTargetDesc.h"
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#include "llvm/ADT/IndexedMap.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 SystemZTargetMachine;
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class SystemZSubtarget;
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class SystemZFrameLowering : public TargetFrameLowering {
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IndexedMap<unsigned> RegSpillOffsets;
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public:
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SystemZFrameLowering();
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// Override TargetFrameLowering.
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bool isFPCloseToIncomingSP() const override { return false; }
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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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void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
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RegScavenger *RS) const override;
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bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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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 MBBII,
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MutableArrayRef<CalleeSavedInfo> CSI,
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const TargetRegisterInfo *TRI) const override;
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void processFunctionBeforeFrameFinalized(MachineFunction &MF,
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RegScavenger *RS) const override;
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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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void inlineStackProbe(MachineFunction &MF,
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MachineBasicBlock &PrologMBB) 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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StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
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Register &FrameReg) const override;
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MachineBasicBlock::iterator
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eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const override;
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// Return the byte offset from the incoming stack pointer of Reg's
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// ABI-defined save slot. Return 0 if no slot is defined for Reg. Adjust
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// the offset in case MF has packed-stack.
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unsigned getRegSpillOffset(MachineFunction &MF, Register Reg) const;
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// Get or create the frame index of where the old frame pointer is stored.
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int getOrCreateFramePointerSaveIndex(MachineFunction &MF) const;
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bool usePackedStack(MachineFunction &MF) const;
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// Return the offset of the backchain.
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unsigned getBackchainOffset(MachineFunction &MF) const {
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// The back chain is stored topmost with packed-stack.
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return usePackedStack(MF) ? SystemZMC::CallFrameSize - 8 : 0;
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}
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};
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} // end namespace llvm
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#endif
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