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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
86 lines
3.4 KiB
C++
86 lines
3.4 KiB
C++
//==-- ARMTargetFrameLowering.h - Define frame lowering for ARM --*- 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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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H
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#define LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H
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#include "llvm/Target/TargetFrameLowering.h"
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namespace llvm {
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class ARMSubtarget;
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class ARMFrameLowering : public TargetFrameLowering {
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protected:
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const ARMSubtarget &STI;
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public:
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explicit ARMFrameLowering(const ARMSubtarget &sti);
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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, MachineBasicBlock &MBB) const override;
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void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
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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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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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bool noFramePointerElim(const MachineFunction &MF) 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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bool canSimplifyCallFramePseudos(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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int ResolveFrameIndexReference(const MachineFunction &MF, int FI,
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unsigned &FrameReg, int SPAdj) const;
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void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
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RegScavenger *RS) const override;
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void adjustForSegmentedStacks(MachineFunction &MF,
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MachineBasicBlock &MBB) const override;
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/// Returns true if the target will correctly handle shrink wrapping.
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bool enableShrinkWrapping(const MachineFunction &MF) const override {
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return true;
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}
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private:
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void emitPushInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
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const std::vector<CalleeSavedInfo> &CSI, unsigned StmOpc,
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unsigned StrOpc, bool NoGap,
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bool(*Func)(unsigned, bool), unsigned NumAlignedDPRCS2Regs,
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unsigned MIFlags = 0) const;
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void emitPopInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
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const std::vector<CalleeSavedInfo> &CSI, unsigned LdmOpc,
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unsigned LdrOpc, bool isVarArg, bool NoGap,
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bool(*Func)(unsigned, bool),
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unsigned NumAlignedDPRCS2Regs) const;
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MachineBasicBlock::iterator
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eliminateCallFramePseudoInstr(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const override;
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};
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} // End llvm namespace
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#endif
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