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> 37 using namespace llvm; 38 39 static cl::opt<std::string> 40 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-")); 41 42 static cl::opt<bool> Dump("dump", cl::desc("Dump low level bitcode trace")); 43 44 //===----------------------------------------------------------------------===// 45 // Bitcode specific analysis. 46 //===----------------------------------------------------------------------===// 47 48 static cl::opt<bool> NoHistogram("disable-histogram", 49 cl::desc("Do not print per-code histogram")); 50 51 static cl::opt<bool> NonSymbolic("non-symbolic", 52 cl::desc("Emit numeric info in dump even if" 53 " symbolic info is available")); 54 55 static cl::opt<std::string> 56 BlockInfoFilename("block-info", 57 cl::desc("Use the BLOCK_INFO from the given file")); 58 59 static cl::opt<bool> 60 ShowBinaryBlobs("show-binary-blobs", 61 cl::desc("Print binary blobs using hex escapes")); 62 63 static cl::opt<std::string> CheckHash( 64 "check-hash", 65 cl::desc("Check module hash using the argument as a string table")); 66 67 static Error reportError(StringRef Message) { 68 return createStringError(std::errc::illegal_byte_sequence, Message.data()); 69 } 70 71 static 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 86 int 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( 106 BA.analyze(O, CheckHash.empty() ? None : Optional<StringRef>(CheckHash))); 107 108 if (Dump) 109 outs() << "\n\n"; 110 111 BA.printStats(O, StringRef(InputFilename.getValue())); 112 return 0; 113 } 114