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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
58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
//===-- LanaiFrameLowering.h - Define frame lowering for Lanai --*- 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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// This class implements Lanai-specific bits of TargetFrameLowering class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H
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#define LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H
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#include "Lanai.h"
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#include "llvm/Target/TargetFrameLowering.h"
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namespace llvm {
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class BitVector;
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class LanaiSubtarget;
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class LanaiFrameLowering : public TargetFrameLowering {
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private:
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void determineFrameLayout(MachineFunction &MF) const;
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void replaceAdjDynAllocPseudo(MachineFunction &MF) const;
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protected:
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const LanaiSubtarget &STI;
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public:
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explicit LanaiFrameLowering(const LanaiSubtarget &Subtarget)
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: TargetFrameLowering(StackGrowsDown,
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/*StackAlignment=*/8,
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/*LocalAreaOffset=*/0),
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STI(Subtarget) {}
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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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MachineBasicBlock::iterator
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eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I) const override;
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bool hasFP(const MachineFunction &MF) const override { return true; }
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void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
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RegScavenger *RS = nullptr) const override;
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};
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} // namespace llvm
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#endif // LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H
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