blob: 5ae2799b60c87840cb4dec68978965a1fd4fb38c [file] [log] [blame]
//===- llvm-cat.cpp - LLVM module concatenation utility -------------------===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// This program is for testing features that rely on multi-module bitcode files.
// It takes a list of input modules and uses them to create a multi-module
// bitcode file.
#include "llvm/ADT/SmallVector.h"
#include "llvm/Bitcode/BitcodeReader.h"
#include "llvm/Bitcode/BitcodeWriter.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <memory>
#include <string>
#include <system_error>
#include <vector>
using namespace llvm;
static cl::opt<bool>
BinaryCat("b", cl::desc("Whether to perform binary concatenation"));
static cl::opt<std::string> OutputFilename("o", cl::Required,
cl::desc("Output filename"),
static cl::list<std::string> InputFilenames(cl::Positional, cl::ZeroOrMore,
cl::desc("<input files>"));
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, "Module concatenation");
ExitOnError ExitOnErr("llvm-cat: ");
LLVMContext Context;
SmallVector<char, 0> Buffer;
BitcodeWriter Writer(Buffer);
if (BinaryCat) {
for (const auto &InputFilename : InputFilenames) {
std::unique_ptr<MemoryBuffer> MB = ExitOnErr(
std::vector<BitcodeModule> Mods = ExitOnErr(getBitcodeModuleList(*MB));
for (auto &BitcodeMod : Mods) {
Buffer.insert(Buffer.end(), BitcodeMod.getBuffer().begin(),
} else {
// The string table does not own strings added to it, some of which are
// owned by the modules; keep them alive until we write the string table.
std::vector<std::unique_ptr<Module>> OwnedMods;
for (const auto &InputFilename : InputFilenames) {
SMDiagnostic Err;
std::unique_ptr<Module> M = parseIRFile(InputFilename, Err, Context);
if (!M) {
Err.print(argv[0], errs());
return 1;
std::error_code EC;
raw_fd_ostream OS(OutputFilename, EC, sys::fs::OpenFlags::F_None);
if (EC) {
errs() << argv[0] << ": cannot open " << OutputFilename << " for writing: "
<< EC.message();
return 1;
OS.write(, Buffer.size());
return 0;