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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
55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
//===-- DisassemblerHelper.h ------------------------------------*- 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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///
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/// \file
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/// Helper class for decoding machine instructions and printing them in an
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/// assembler form.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_EXEGESIS_DISASSEMBLER_HELPER_H
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#define LLVM_TOOLS_LLVM_EXEGESIS_DISASSEMBLER_HELPER_H
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#include "LlvmState.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCDisassembler/MCDisassembler.h"
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#include "llvm/MC/MCInstPrinter.h"
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#include <memory>
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namespace llvm {
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namespace exegesis {
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// A helper class for decoding and printing machine instructions.
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class DisassemblerHelper {
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public:
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DisassemblerHelper(const LLVMState &State);
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void printInst(const MCInst *MI, raw_ostream &OS) const {
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const auto &STI = State_.getSubtargetInfo();
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InstPrinter_->printInst(MI, 0, "", STI, OS);
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}
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bool decodeInst(MCInst &MI, uint64_t &MISize, ArrayRef<uint8_t> Bytes) const {
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return Disasm_->getInstruction(MI, MISize, Bytes, 0, nulls());
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}
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private:
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const LLVMState &State_;
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std::unique_ptr<MCContext> Context_;
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std::unique_ptr<MCAsmInfo> AsmInfo_;
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std::unique_ptr<MCInstPrinter> InstPrinter_;
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std::unique_ptr<MCDisassembler> Disasm_;
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};
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} // namespace exegesis
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} // namespace llvm
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#endif // LLVM_TOOLS_LLVM_EXEGESIS_DISASSEMBLER_HELPER_H
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