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07d10a6e30
This will become necessary in a subsequent change to make this method merge adjacent stack adjustments, i.e. it might erase the previous and/or next instruction. It also greatly simplifies the calls to this function from Prolog- EpilogInserter. Previously, that had a bunch of logic to resume iteration after the call; now it just continues with the returned iterator. Note that this changes the behaviour of PEI a little. Previously, it attempted to re-visit the new instruction created by eliminateCallFramePseudoInstr(). That code was added in r36625, but I can't see any reason for it: the new instructions will obviously not be pseudo instructions, they will not have FrameIndex operands, and we have already accounted for the stack adjustment. Differential Revision: http://reviews.llvm.org/D18627 llvm-svn: 265036
65 lines
2.7 KiB
C++
65 lines
2.7 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 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/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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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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const SpillSlot *getCalleeSavedSpillSlots(unsigned &NumEntries) const
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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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const std::vector<CalleeSavedInfo> &CSI,
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const TargetRegisterInfo *TRI) const override;
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bool 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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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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bool hasFP(const MachineFunction &MF) const override;
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int getFrameIndexReference(const MachineFunction &MF, int FI,
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unsigned &FrameReg) const override;
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bool hasReservedCallFrame(const MachineFunction &MF) 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 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 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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