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https://github.com/c64scene-ar/llvm-6502.git
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52c28b07f0
Get rid of some old code (and associated FIXME) for handling the caller-allocated register save area. No behavioural change intended. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185525 91177308-0d34-0410-b5e6-96231b3b80d8
86 lines
3.3 KiB
C++
86 lines
3.3 KiB
C++
//===-- SystemZFrameLowering.h - Frame lowering for SystemZ -----*- 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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#ifndef SYSTEMZFRAMELOWERING_H
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#define SYSTEMZFRAMELOWERING_H
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#include "SystemZSubtarget.h"
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#include "llvm/ADT/IndexedMap.h"
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#include "llvm/Target/TargetFrameLowering.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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protected:
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const SystemZTargetMachine &TM;
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const SystemZSubtarget &STI;
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public:
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SystemZFrameLowering(const SystemZTargetMachine &tm,
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const SystemZSubtarget &sti);
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// Override TargetFrameLowering.
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virtual const SpillSlot *getCalleeSavedSpillSlots(unsigned &NumEntries) const
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LLVM_OVERRIDE;
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virtual void
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processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
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RegScavenger *RS) const LLVM_OVERRIDE;
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virtual bool
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spillCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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const std::vector<CalleeSavedInfo> &CSI,
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const TargetRegisterInfo *TRI) const
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LLVM_OVERRIDE;
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virtual bool
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restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBII,
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const std::vector<CalleeSavedInfo> &CSI,
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const TargetRegisterInfo *TRI) const
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LLVM_OVERRIDE;
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virtual void emitPrologue(MachineFunction &MF) const LLVM_OVERRIDE;
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virtual void emitEpilogue(MachineFunction &MF,
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MachineBasicBlock &MBB) const LLVM_OVERRIDE;
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virtual bool hasFP(const MachineFunction &MF) const LLVM_OVERRIDE;
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virtual int getFrameIndexOffset(const MachineFunction &MF,
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int FI) const LLVM_OVERRIDE;
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virtual bool hasReservedCallFrame(const MachineFunction &MF) const
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LLVM_OVERRIDE;
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virtual void
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eliminateCallFramePseudoInstr(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const
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LLVM_OVERRIDE;
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// Return the number of bytes in the callee-allocated part of the frame.
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uint64_t getAllocatedStackSize(const MachineFunction &MF) const;
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// Return the number of frame bytes that should be reserved for
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// an emergency spill slot, for use by the register scaveneger.
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// Return 0 if register scaveging won't be needed.
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unsigned getEmergencySpillSlotSize(const MachineFunction &MF) const;
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// Return the offset from the frame pointer of the emergency spill slot,
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// which always fits within a 12-bit unsigned displacement field.
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// Only valid if getEmergencySpillSlotSize(MF) returns nonzero.
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unsigned getEmergencySpillSlotOffset(const MachineFunction &MF) const;
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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.
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unsigned getRegSpillOffset(unsigned Reg) const {
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return RegSpillOffsets[Reg];
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}
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};
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} // end namespace llvm
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#endif
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