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78cc6fcb01
This is the second patch in a small series. This patch contains the MachineInstruction and x86-64 backend pieces required to lower Statepoints. It does not include the code to actually generate the STATEPOINT machine instruction and as a result, the entire patch is currently dead code. I will be submitting the SelectionDAG parts within the next 24-48 hours. Since those pieces are by far the most complicated, I wanted to minimize the size of that patch. That patch will include the tests which exercise the functionality in this patch. The entire series can be seen as one combined whole in http://reviews.llvm.org/D5683. The STATEPOINT psuedo node is generated after all gc values are explicitly spilled to stack slots. The purpose of this node is to wrap an actual call instruction while recording the spill locations of the meta arguments used for garbage collection and other purposes. The STATEPOINT is modeled as modifing all of those locations to prevent backend optimizations from forwarding the value from before the STATEPOINT to after the STATEPOINT. (Doing so would break relocation semantics for collectors which wish to relocate roots.) The implementation of STATEPOINT is closely modeled on PATCHPOINT. Eventually, much of the code in this patch will be removed. The long term plan is to merge the functionality provided by statepoints and patchpoints. Merging their implementations in the backend is likely to be a good starting point. Reviewed by: atrick, ributzka git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223085 91177308-0d34-0410-b5e6-96231b3b80d8
84 lines
3.3 KiB
C++
84 lines
3.3 KiB
C++
//===-- X86TargetFrameLowering.h - Define frame lowering for X86 -*- 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 X86-specific bits of TargetFrameLowering class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H
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#define LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H
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#include "llvm/Target/TargetFrameLowering.h"
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namespace llvm {
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class MCSymbol;
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class X86TargetMachine;
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class X86Subtarget;
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class X86FrameLowering : public TargetFrameLowering {
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public:
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explicit X86FrameLowering(StackDirection D, unsigned StackAl, int LAO)
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: TargetFrameLowering(StackGrowsDown, StackAl, LAO) {}
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static void getStackProbeFunction(const X86Subtarget &STI,
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unsigned &CallOp,
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const char *&Symbol);
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void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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DebugLoc DL) 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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void adjustForSegmentedStacks(MachineFunction &MF) const override;
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void adjustForHiPEPrologue(MachineFunction &MF) const override;
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void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
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RegScavenger *RS = nullptr) const override;
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bool
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assignCalleeSavedSpillSlots(MachineFunction &MF,
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const TargetRegisterInfo *TRI,
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std::vector<CalleeSavedInfo> &CSI) 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 hasFP(const MachineFunction &MF) const override;
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bool hasReservedCallFrame(const MachineFunction &MF) const override;
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int getFrameIndexOffset(const MachineFunction &MF, int FI) 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 getFrameIndexOffsetFromSP(const MachineFunction &MF, int FI) const;
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int getFrameIndexReferenceFromSP(const MachineFunction &MF, int FI,
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unsigned &FrameReg) const override;
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void 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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