d57bba7cf8
To accommodate frame layouts that have both fixed and scalable objects on the stack, describing a stack location or offset using a pointer + uint64_t is not sufficient. For this reason, we've introduced the StackOffset class, which models both the fixed- and scalable sized offsets. The TargetFrameLowering::getFrameIndexReference is made to return a StackOffset, so that this can be used in other interfaces, such as to eliminate frame indices in PEI or to emit Debug locations for variables on the stack. This patch is purely mechanical and doesn't change the behaviour of how the result of this function is used for fixed-sized offsets. The patch adds various checks to assert that the offset has no scalable component, as frame offsets with a scalable component are not yet supported in various places. Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D90018
70 lines
3.1 KiB
C++
70 lines
3.1 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 "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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};
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} // end namespace llvm
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#endif
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