39fc67b8af
As part of preparing the reports, the Analysis class needs to print machine instructions in a disassembled form. For this purpose, the class has four fields (namely Context_, AsmInfo_, InstPrinter_ and Disasm_). All the constructor of the Analysis class does is conditionally initializing these four fields. This commit factors out the logic for decoding machine code and printing it in an assembler form into a separate DisassemblerHelper class. ~~ Huawei RRI, OS Lab Reviewed By: courbet Differential Revision: https://reviews.llvm.org/D147156
36 lines
1.4 KiB
C++
36 lines
1.4 KiB
C++
//===-- DisassemblerHelper.cpp ----------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "DisassemblerHelper.h"
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#include "llvm/MC/TargetRegistry.h"
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namespace llvm {
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namespace exegesis {
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DisassemblerHelper::DisassemblerHelper(const LLVMState &State) : State_(State) {
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MCTargetOptions MCOptions;
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const auto &TM = State.getTargetMachine();
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const auto &Triple = TM.getTargetTriple();
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AsmInfo_.reset(TM.getTarget().createMCAsmInfo(State_.getRegInfo(),
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Triple.str(), MCOptions));
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InstPrinter_.reset(TM.getTarget().createMCInstPrinter(
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Triple, 0 /*default variant*/, *AsmInfo_, State_.getInstrInfo(),
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State_.getRegInfo()));
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Context_ = std::make_unique<MCContext>(
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Triple, AsmInfo_.get(), &State_.getRegInfo(), &State_.getSubtargetInfo());
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Disasm_.reset(TM.getTarget().createMCDisassembler(State_.getSubtargetInfo(),
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*Context_));
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assert(Disasm_ && "cannot create MCDisassembler. missing call to "
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"InitializeXXXTargetDisassembler ?");
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}
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} // namespace exegesis
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} // namespace llvm
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