forked from OSchip/llvm-project
127 lines
4.7 KiB
C++
127 lines
4.7 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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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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static unsigned getReturnSaveOffset(bool isPPC64, bool isDarwinABI) {
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if (isDarwinABI)
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return isPPC64 ? 16 : 8;
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// SVR4 ABI:
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return isPPC64 ? 16 : 4;
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}
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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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static unsigned getTOCSaveOffset(bool isELFv2ABI) {
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return isELFv2ABI ? 24 : 40;
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}
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/// getFramePointerSaveOffset - Return the previous frame offset to save the
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/// frame pointer.
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static unsigned getFramePointerSaveOffset(bool isPPC64, bool isDarwinABI) {
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// For the Darwin ABI:
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// We cannot use the TOC save slot (offset +20) in the PowerPC linkage area
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// for saving the frame pointer (if needed.) While the published ABI has
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// not used this slot since at least MacOSX 10.2, there is older code
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// around that does use it, and that needs to continue to work.
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if (isDarwinABI)
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return isPPC64 ? -8U : -4U;
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// SVR4 ABI: First slot in the general register save area.
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return isPPC64 ? -8U : -4U;
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}
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/// getBasePointerSaveOffset - Return the previous frame offset to save the
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/// base pointer.
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static unsigned getBasePointerSaveOffset(bool isPPC64,
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bool isDarwinABI,
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bool isPIC) {
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if (isDarwinABI)
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return isPPC64 ? -16U : -8U;
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// SVR4 ABI: First slot in the general register save area.
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return isPPC64 ? -16U : isPIC ? -12U : -8U;
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}
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/// getLinkageSize - Return the size of the PowerPC ABI linkage area.
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///
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static unsigned getLinkageSize(bool isPPC64, bool isDarwinABI,
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bool isELFv2ABI) {
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if (isDarwinABI || isPPC64)
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return (isELFv2ABI ? 4 : 6) * (isPPC64 ? 8 : 4);
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// SVR4 ABI:
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return 8;
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}
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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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