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77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
//===-- llvm-modextract.cpp - LLVM module extractor utility ---------------===//
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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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// This program is for testing features that rely on multi-module bitcode files.
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// It takes a multi-module bitcode file, extracts one of the modules and writes
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// it to the output file.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Bitcode/BitcodeReader.h"
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#include "llvm/Bitcode/BitcodeWriter.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/ToolOutputFile.h"
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using namespace llvm;
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static cl::opt<bool>
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BinaryExtract("b", cl::desc("Whether to perform binary extraction"));
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static cl::opt<std::string> OutputFilename("o", cl::Required,
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cl::desc("Output filename"),
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cl::value_desc("filename"));
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static cl::opt<std::string>
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InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
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static cl::opt<unsigned> ModuleIndex("n", cl::Required,
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cl::desc("Index of module to extract"),
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cl::value_desc("index"));
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int main(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv, "Module extractor");
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ExitOnError ExitOnErr("llvm-modextract: error: ");
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std::unique_ptr<MemoryBuffer> MB =
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ExitOnErr(errorOrToExpected(MemoryBuffer::getFileOrSTDIN(InputFilename)));
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std::vector<BitcodeModule> Ms = ExitOnErr(getBitcodeModuleList(*MB));
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LLVMContext Context;
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if (ModuleIndex >= Ms.size()) {
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errs() << "llvm-modextract: error: module index out of range; bitcode file "
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"contains "
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<< Ms.size() << " module(s)\n";
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return 1;
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}
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std::error_code EC;
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std::unique_ptr<ToolOutputFile> Out(
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new ToolOutputFile(OutputFilename, EC, sys::fs::OF_None));
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ExitOnErr(errorCodeToError(EC));
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if (BinaryExtract) {
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SmallVector<char, 0> Result;
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BitcodeWriter Writer(Result);
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Result.append(Ms[ModuleIndex].getBuffer().begin(),
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Ms[ModuleIndex].getBuffer().end());
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Writer.copyStrtab(Ms[ModuleIndex].getStrtab());
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Out->os() << Result;
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Out->keep();
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return 0;
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}
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std::unique_ptr<Module> M = ExitOnErr(Ms[ModuleIndex].parseModule(Context));
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WriteBitcodeToFile(*M, Out->os());
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Out->keep();
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return 0;
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}
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