forked from OSchip/llvm-project
99 lines
3.8 KiB
C++
99 lines
3.8 KiB
C++
//===-- PPCFrameLowering.h - Define frame lowering for PowerPC --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_POWERPC_PPCFRAMELOWERING_H
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#define LLVM_LIB_TARGET_POWERPC_PPCFRAMELOWERING_H
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#include "PPC.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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class PPCSubtarget;
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class PPCFrameLowering: public TargetFrameLowering {
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const PPCSubtarget &Subtarget;
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const unsigned ReturnSaveOffset;
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const unsigned TOCSaveOffset;
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const unsigned FramePointerSaveOffset;
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const unsigned LinkageSize;
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const unsigned BasePointerSaveOffset;
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public:
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PPCFrameLowering(const PPCSubtarget &STI);
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unsigned determineFrameLayout(MachineFunction &MF,
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bool UpdateMF = true,
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bool UseEstimate = false) const;
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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) const override;
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void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
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bool hasFP(const MachineFunction &MF) const override;
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bool needsFP(const MachineFunction &MF) const;
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void replaceFPWithRealFP(MachineFunction &MF) const;
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void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
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RegScavenger *RS = nullptr) const override;
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void processFunctionBeforeFrameFinalized(MachineFunction &MF,
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RegScavenger *RS = nullptr) const override;
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void addScavengingSpillSlot(MachineFunction &MF, RegScavenger *RS) const;
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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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void eliminateCallFramePseudoInstr(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I) const override;
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bool restoreCalleeSavedRegisters(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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/// targetHandlesStackFrameRounding - Returns true if the target is
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/// responsible for rounding up the stack frame (probably at emitPrologue
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/// time).
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bool targetHandlesStackFrameRounding() const override { return true; }
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/// getReturnSaveOffset - Return the previous frame offset to save the
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/// return address.
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unsigned getReturnSaveOffset() const { return ReturnSaveOffset; }
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/// getTOCSaveOffset - Return the previous frame offset to save the
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/// TOC register -- 64-bit SVR4 ABI only.
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unsigned getTOCSaveOffset() const { return TOCSaveOffset; }
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/// getFramePointerSaveOffset - Return the previous frame offset to save the
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/// frame pointer.
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unsigned getFramePointerSaveOffset() const { return FramePointerSaveOffset; }
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/// getBasePointerSaveOffset - Return the previous frame offset to save the
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/// base pointer.
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unsigned getBasePointerSaveOffset() const { return BasePointerSaveOffset; }
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/// getLinkageSize - Return the size of the PowerPC ABI linkage area.
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///
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unsigned getLinkageSize() const { return LinkageSize; }
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const SpillSlot *
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getCalleeSavedSpillSlots(unsigned &NumEntries) const override;
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};
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} // End llvm namespace
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#endif
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