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0fb89f87e0
MCRelaxableFragment previously kept a copy of MCSubtargetInfo and MCInst to enable re-encoding the MCInst later during relaxation. A copy of MCSubtargetInfo (instead of a reference or pointer) was needed because the feature bits could be modified by the parser. This commit replaces the MCSubtargetInfo copy in MCRelaxableFragment with a constant reference to MCSubtargetInfo. The copies of MCSubtargetInfo are kept in MCContext, and the target parsers are now responsible for asking MCContext to provide a copy whenever the feature bits of MCSubtargetInfo have to be toggled. With this patch, I saw a 4% reduction in peak memory usage when I compiled verify-uselistorder.lto.bc using llc. rdar://problem/21736951 Differential Revision: http://reviews.llvm.org/D14346 llvm-svn: 253127
69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
//===- X86AsmInstrumentation.h - Instrument X86 inline assembly *- 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_X86_ASMPARSER_X86ASMINSTRUMENTATION_H
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#define LLVM_LIB_TARGET_X86_ASMPARSER_X86ASMINSTRUMENTATION_H
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#include "llvm/ADT/SmallVector.h"
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#include <memory>
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namespace llvm {
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class MCContext;
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class MCInst;
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class MCInstrInfo;
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class MCParsedAsmOperand;
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class MCStreamer;
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class MCSubtargetInfo;
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class MCTargetOptions;
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class X86AsmInstrumentation;
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X86AsmInstrumentation *
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CreateX86AsmInstrumentation(const MCTargetOptions &MCOptions,
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const MCContext &Ctx,
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const MCSubtargetInfo *&STI);
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class X86AsmInstrumentation {
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public:
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virtual ~X86AsmInstrumentation();
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// Sets frame register corresponding to a current frame.
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void SetInitialFrameRegister(unsigned RegNo) {
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InitialFrameReg = RegNo;
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}
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// Tries to instrument and emit instruction.
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virtual void InstrumentAndEmitInstruction(
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const MCInst &Inst,
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SmallVectorImpl<std::unique_ptr<MCParsedAsmOperand> > &Operands,
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MCContext &Ctx, const MCInstrInfo &MII, MCStreamer &Out);
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protected:
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friend X86AsmInstrumentation *
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CreateX86AsmInstrumentation(const MCTargetOptions &MCOptions,
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const MCContext &Ctx,
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const MCSubtargetInfo *&STI);
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X86AsmInstrumentation(const MCSubtargetInfo *&STI);
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unsigned GetFrameRegGeneric(const MCContext &Ctx, MCStreamer &Out);
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void EmitInstruction(MCStreamer &Out, const MCInst &Inst);
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const MCSubtargetInfo *&STI;
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unsigned InitialFrameReg;
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};
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} // End llvm namespace
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#endif
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