1//===-- llvm-bcanalyzer.cpp - Bitcode Analyzer --------------------------===// 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 tool may be invoked in the following manner: 10// llvm-bcanalyzer [options] - Read LLVM bitcode from stdin 11// llvm-bcanalyzer [options] x.bc - Read LLVM bitcode from the x.bc file 12// 13// Options: 14// --help - Output information about command line switches 15// --dump - Dump low-level bitcode structure in readable format 16// 17// This tool provides analytical information about a bitcode file. It is 18// intended as an aid to developers of bitcode reading and writing software. It 19// produces on std::out a summary of the bitcode file that shows various 20// statistics about the contents of the file. By default this information is 21// detailed and contains information about individual bitcode blocks and the 22// functions in the module. 23// The tool is also able to print a bitcode file in a straight forward text 24// format that shows the containment and relationships of the information in 25// the bitcode file (-dump option). 26// 27//===----------------------------------------------------------------------===// 28 29#include "llvm/ADT/Optional.h" 30#include "llvm/Bitcode/BitcodeAnalyzer.h" 31#include "llvm/Support/CommandLine.h" 32#include "llvm/Support/Error.h" 33#include "llvm/Support/InitLLVM.h" 34#include "llvm/Support/MemoryBuffer.h" 35#include "llvm/Support/raw_ostream.h" 36#include <memory> 37using namespace llvm; 38 39static cl::opt<std::string> 40 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-")); 41 42static cl::opt<bool> Dump("dump", cl::desc("Dump low level bitcode trace")); 43 44//===----------------------------------------------------------------------===// 45// Bitcode specific analysis. 46//===----------------------------------------------------------------------===// 47 48static cl::opt<bool> NoHistogram("disable-histogram", 49 cl::desc("Do not print per-code histogram")); 50 51static cl::opt<bool> NonSymbolic("non-symbolic", 52 cl::desc("Emit numeric info in dump even if" 53 " symbolic info is available")); 54 55static cl::opt<std::string> 56 BlockInfoFilename("block-info", 57 cl::desc("Use the BLOCK_INFO from the given file")); 58 59static cl::opt<bool> 60 ShowBinaryBlobs("show-binary-blobs", 61 cl::desc("Print binary blobs using hex escapes")); 62 63static cl::opt<std::string> CheckHash( 64 "check-hash", 65 cl::desc("Check module hash using the argument as a string table")); 66 67static Error reportError(StringRef Message) { 68 return createStringError(std::errc::illegal_byte_sequence, Message.data()); 69} 70 71static Expected<std::unique_ptr<MemoryBuffer>> openBitcodeFile(StringRef Path) { 72 // Read the input file. 73 Expected<std::unique_ptr<MemoryBuffer>> MemBufOrErr = 74 errorOrToExpected(MemoryBuffer::getFileOrSTDIN(Path)); 75 if (Error E = MemBufOrErr.takeError()) 76 return std::move(E); 77 78 std::unique_ptr<MemoryBuffer> MemBuf = std::move(*MemBufOrErr); 79 80 if (MemBuf->getBufferSize() & 3) 81 return reportError( 82 "Bitcode stream should be a multiple of 4 bytes in length"); 83 return std::move(MemBuf); 84} 85 86int main(int argc, char **argv) { 87 InitLLVM X(argc, argv); 88 cl::ParseCommandLineOptions(argc, argv, "llvm-bcanalyzer file analyzer\n"); 89 ExitOnError ExitOnErr("llvm-bcanalyzer: "); 90 91 std::unique_ptr<MemoryBuffer> MB = ExitOnErr(openBitcodeFile(InputFilename)); 92 std::unique_ptr<MemoryBuffer> BlockInfoMB = nullptr; 93 if (!BlockInfoFilename.empty()) 94 BlockInfoMB = ExitOnErr(openBitcodeFile(BlockInfoFilename)); 95 96 BitcodeAnalyzer BA(MB->getBuffer(), 97 BlockInfoMB ? Optional<StringRef>(BlockInfoMB->getBuffer()) 98 : None); 99 100 BCDumpOptions O(outs()); 101 O.Histogram = !NoHistogram; 102 O.Symbolic = !NonSymbolic; 103 O.ShowBinaryBlobs = ShowBinaryBlobs; 104 105 ExitOnErr(BA.analyze( 106 Dump ? Optional<BCDumpOptions>(O) : Optional<BCDumpOptions>(None), 107 CheckHash.empty() ? None : Optional<StringRef>(CheckHash))); 108 109 if (Dump) 110 outs() << "\n\n"; 111 112 BA.printStats(O, StringRef(InputFilename.getValue())); 113 return 0; 114} 115