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7d7d99622f
The old system was fairly convoluted: * A temporary label was created. * A single PROLOG_LABEL was created with it. * A few MCCFIInstructions were created with the same label. The semantics were that the cfi instructions were mapped to the PROLOG_LABEL via the temporary label. The output position was that of the PROLOG_LABEL. The temporary label itself was used only for doing the mapping. The new CFI_INSTRUCTION has a 1:1 mapping to MCCFIInstructions and points to one by holding an index into the CFI instructions of this function. I did consider removing MMI.getFrameInstructions completelly and having CFI_INSTRUCTION own a MCCFIInstruction, but MCCFIInstructions have non trivial constructors and destructors and are somewhat big, so the this setup is probably better. The net result is that we don't create temporary labels that are never used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203204 91177308-0d34-0410-b5e6-96231b3b80d8
78 lines
2.8 KiB
C++
78 lines
2.8 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 X86_FRAMELOWERING_H
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#define X86_FRAMELOWERING_H
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#include "X86Subtarget.h"
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#include "llvm/MC/MCDwarf.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 X86FrameLowering : public TargetFrameLowering {
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const X86TargetMachine &TM;
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const X86Subtarget &STI;
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public:
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explicit X86FrameLowering(const X86TargetMachine &tm, const X86Subtarget &sti)
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: TargetFrameLowering(StackGrowsDown,
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sti.getStackAlignment(),
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(sti.is64Bit() ? -8 : -4)),
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TM(tm), STI(sti) {
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}
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void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI, DebugLoc DL,
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unsigned FramePtr) 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;
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void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
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void adjustForSegmentedStacks(MachineFunction &MF) const;
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void adjustForHiPEPrologue(MachineFunction &MF) const;
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void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
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RegScavenger *RS = NULL) const;
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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;
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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;
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bool hasFP(const MachineFunction &MF) const;
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bool hasReservedCallFrame(const MachineFunction &MF) const;
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int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
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int getFrameIndexReference(const MachineFunction &MF, int FI,
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unsigned &FrameReg) const;
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void eliminateCallFramePseudoInstr(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const;
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};
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} // End llvm namespace
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#endif
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