[llvm-readobj] - Fix a TODO in elf-reloc-zero-name-or-value.test.
[llvm-complete.git] / tools / llvm-cat / llvm-cat.cpp
blob85f2b410f870bab738b9f4e2e1a022bf11871ae4
1 //===- llvm-cat.cpp - LLVM module concatenation utility -------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This program is for testing features that rely on multi-module bitcode files.
10 // It takes a list of input modules and uses them to create a multi-module
11 // bitcode file.
13 //===----------------------------------------------------------------------===//
15 #include "llvm/ADT/SmallVector.h"
16 #include "llvm/Bitcode/BitcodeReader.h"
17 #include "llvm/Bitcode/BitcodeWriter.h"
18 #include "llvm/IR/LLVMContext.h"
19 #include "llvm/IR/Module.h"
20 #include "llvm/IRReader/IRReader.h"
21 #include "llvm/Support/CommandLine.h"
22 #include "llvm/Support/Error.h"
23 #include "llvm/Support/FileSystem.h"
24 #include "llvm/Support/MemoryBuffer.h"
25 #include "llvm/Support/SourceMgr.h"
26 #include "llvm/Support/raw_ostream.h"
27 #include <algorithm>
28 #include <memory>
29 #include <string>
30 #include <system_error>
31 #include <vector>
33 using namespace llvm;
35 cl::OptionCategory CatCategory("llvm-cat Options");
37 static cl::opt<bool>
38 BinaryCat("b", cl::desc("Whether to perform binary concatenation"),
39 cl::cat(CatCategory));
41 static cl::opt<std::string> OutputFilename("o", cl::Required,
42 cl::desc("Output filename"),
43 cl::value_desc("filename"),
44 cl::cat(CatCategory));
46 static cl::list<std::string> InputFilenames(cl::Positional, cl::ZeroOrMore,
47 cl::desc("<input files>"),
48 cl::cat(CatCategory));
50 int main(int argc, char **argv) {
51 cl::HideUnrelatedOptions(CatCategory);
52 cl::ParseCommandLineOptions(argc, argv, "Module concatenation");
54 ExitOnError ExitOnErr("llvm-cat: ");
55 LLVMContext Context;
57 SmallVector<char, 0> Buffer;
58 BitcodeWriter Writer(Buffer);
59 if (BinaryCat) {
60 for (const auto &InputFilename : InputFilenames) {
61 std::unique_ptr<MemoryBuffer> MB = ExitOnErr(
62 errorOrToExpected(MemoryBuffer::getFileOrSTDIN(InputFilename)));
63 std::vector<BitcodeModule> Mods = ExitOnErr(getBitcodeModuleList(*MB));
64 for (auto &BitcodeMod : Mods) {
65 Buffer.insert(Buffer.end(), BitcodeMod.getBuffer().begin(),
66 BitcodeMod.getBuffer().end());
67 Writer.copyStrtab(BitcodeMod.getStrtab());
70 } else {
71 // The string table does not own strings added to it, some of which are
72 // owned by the modules; keep them alive until we write the string table.
73 std::vector<std::unique_ptr<Module>> OwnedMods;
74 for (const auto &InputFilename : InputFilenames) {
75 SMDiagnostic Err;
76 std::unique_ptr<Module> M = parseIRFile(InputFilename, Err, Context);
77 if (!M) {
78 Err.print(argv[0], errs());
79 return 1;
81 Writer.writeModule(*M);
82 OwnedMods.push_back(std::move(M));
84 Writer.writeStrtab();
87 std::error_code EC;
88 raw_fd_ostream OS(OutputFilename, EC, sys::fs::OpenFlags::OF_None);
89 if (EC) {
90 errs() << argv[0] << ": cannot open " << OutputFilename << " for writing: "
91 << EC.message();
92 return 1;
95 OS.write(Buffer.data(), Buffer.size());
96 return 0;