1 //===-- llvm-bcanalyzer.cpp - Byte Code Analyzer --------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Reid Spencer and is distributed under the
6 // University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This tool may be invoked in the following manner:
11 // llvm-bcanalyzer [options] - Read LLVM bytecode from stdin
12 // llvm-bcanalyzer [options] x.bc - Read LLVM bytecode from the x.bc file
15 // --help - Output information about command line switches
16 // --nodetails - Don't print out detailed informaton about individual
17 // blocks and functions
18 // --dump - Dump low-level bytecode structure in readable format
20 // This tool provides analytical information about a bytecode file. It is
21 // intended as an aid to developers of bytecode reading and writing software. It
22 // produces on std::out a summary of the bytecode file that shows various
23 // statistics about the contents of the file. By default this information is
24 // detailed and contains information about individual bytecode blocks and the
25 // functions in the module. To avoid this more detailed output, use the
26 // -nodetails option to limit the output to just module level information.
27 // The tool is also able to print a bytecode file in a straight forward text
28 // format that shows the containment and relationships of the information in
29 // the bytecode file (-dump option).
30 //===----------------------------------------------------------------------===//
32 #include "llvm/Analysis/Verifier.h"
33 #include "llvm/Bytecode/Analyzer.h"
34 #include "llvm/Support/CommandLine.h"
35 #include "llvm/Support/Compressor.h"
36 #include "llvm/Support/ManagedStatic.h"
37 #include "llvm/System/Signals.h"
43 static cl::opt<std::string>
44 InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
46 static cl::opt<std::string>
47 OutputFilename("-o", cl::init("-"), cl::desc("<output file>"));
49 static cl::opt<bool> NoDetails ("nodetails", cl::desc("Skip detailed output"));
50 static cl::opt<bool> Dump ("dump", cl::desc("Dump low level bytecode trace"));
51 static cl::opt<bool> Verify ("verify", cl::desc("Progressively verify module"));
53 int main(int argc, char **argv) {
54 llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
56 cl::ParseCommandLineOptions(argc, argv,
57 " llvm-bcanalyzer Analysis of ByteCode Dumper\n");
59 sys::PrintStackTraceOnErrorSignal();
61 std::ostream* Out = &std::cout; // Default to printing to stdout...
62 std::string ErrorMessage;
65 /// Determine what to generate
66 bca.detailedResults = !NoDetails;
67 bca.progressiveVerify = Verify;
69 /// Analyze the bytecode file
70 Module* M = AnalyzeBytecodeFile(InputFilename, bca,
71 Compressor::decompressToNewBuffer,
72 &ErrorMessage, (Dump?Out:0));
74 // All that bcanalyzer does is write the gathered statistics to the output
75 PrintBytecodeAnalysis(bca,*Out);
78 std::string verificationMsg;
79 if (verifyModule(*M, ReturnStatusAction, &verificationMsg))
80 std::cerr << "Final Verification Message: " << verificationMsg << "\n";
83 if (Out != &std::cout) {
84 ((std::ofstream*)Out)->close();
88 } catch (const std::string& msg) {
89 std::cerr << argv[0] << ": " << msg << "\n";
91 std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";