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//===-- llvm-bcanalyzer.cpp - Bitcode Analyzer --------------------------===//
// 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 tool may be invoked in the following manner:
// llvm-bcanalyzer [options] - Read LLVM bitcode from stdin
// llvm-bcanalyzer [options] x.bc - Read LLVM bitcode from the x.bc file
// Options:
// --help - Output information about command line switches
// --dump - Dump low-level bitcode structure in readable format
// This tool provides analytical information about a bitcode file. It is
// intended as an aid to developers of bitcode reading and writing software. It
// produces on std::out a summary of the bitcode file that shows various
// statistics about the contents of the file. By default this information is
// detailed and contains information about individual bitcode blocks and the
// functions in the module.
// The tool is also able to print a bitcode file in a straight forward text
// format that shows the containment and relationships of the information in
// the bitcode file (-dump option).
#include "llvm/ADT/Optional.h"
#include "llvm/Bitcode/BitcodeAnalyzer.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <memory>
using namespace llvm;
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
static cl::opt<bool> Dump("dump", cl::desc("Dump low level bitcode trace"));
// Bitcode specific analysis.
static cl::opt<bool> NoHistogram("disable-histogram",
cl::desc("Do not print per-code histogram"));
static cl::opt<bool> NonSymbolic("non-symbolic",
cl::desc("Emit numeric info in dump even if"
" symbolic info is available"));
static cl::opt<std::string>
cl::desc("Use the BLOCK_INFO from the given file"));
static cl::opt<bool>
cl::desc("Print binary blobs using hex escapes"));
static cl::opt<std::string> CheckHash(
cl::desc("Check module hash using the argument as a string table"));
static Error reportError(StringRef Message) {
return createStringError(std::errc::illegal_byte_sequence,;
static Expected<std::unique_ptr<MemoryBuffer>> openBitcodeFile(StringRef Path) {
// Read the input file.
Expected<std::unique_ptr<MemoryBuffer>> MemBufOrErr =
if (Error E = MemBufOrErr.takeError())
return std::move(E);
std::unique_ptr<MemoryBuffer> MemBuf = std::move(*MemBufOrErr);
if (MemBuf->getBufferSize() & 3)
return reportError(
"Bitcode stream should be a multiple of 4 bytes in length");
return std::move(MemBuf);
int main(int argc, char **argv) {
InitLLVM X(argc, argv);
cl::ParseCommandLineOptions(argc, argv, "llvm-bcanalyzer file analyzer\n");
ExitOnError ExitOnErr("llvm-bcanalyzer: ");
std::unique_ptr<MemoryBuffer> MB = ExitOnErr(openBitcodeFile(InputFilename));
std::unique_ptr<MemoryBuffer> BlockInfoMB = nullptr;
if (!BlockInfoFilename.empty())
BlockInfoMB = ExitOnErr(openBitcodeFile(BlockInfoFilename));
BitcodeAnalyzer BA(MB->getBuffer(),
BlockInfoMB ? Optional<StringRef>(BlockInfoMB->getBuffer())
: None);
BCDumpOptions O(outs());
O.Histogram = !NoHistogram;
O.Symbolic = !NonSymbolic;
O.ShowBinaryBlobs = ShowBinaryBlobs;
BA.analyze(O, CheckHash.empty() ? None : Optional<StringRef>(CheckHash)));
if (Dump)
outs() << "\n\n";
BA.printStats(O, StringRef(InputFilename.getValue()));
return 0;