1 //===-- llvm-dis.cpp - The low-level LLVM disassembler --------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This utility may be invoked in the following manner:
11 // llvm-dis [options] - Read LLVM bitcode from stdin, write asm to stdout
12 // llvm-dis [options] x.bc - Read LLVM bitcode from the x.bc file, write asm
15 // --help - Output information about command line switches
17 //===----------------------------------------------------------------------===//
19 #include "llvm/LLVMContext.h"
20 #include "llvm/Module.h"
21 #include "llvm/Type.h"
22 #include "llvm/Bitcode/ReaderWriter.h"
23 #include "llvm/Assembly/AssemblyAnnotationWriter.h"
24 #include "llvm/Support/CommandLine.h"
25 #include "llvm/Support/FormattedStream.h"
26 #include "llvm/Support/ManagedStatic.h"
27 #include "llvm/Support/MemoryBuffer.h"
28 #include "llvm/Support/PrettyStackTrace.h"
29 #include "llvm/Support/ToolOutputFile.h"
30 #include "llvm/Support/Signals.h"
31 #include "llvm/Support/system_error.h"
34 static cl::opt<std::string>
35 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
37 static cl::opt<std::string>
38 OutputFilename("o", cl::desc("Override output filename"),
39 cl::value_desc("filename"));
42 Force("f", cl::desc("Enable binary output on terminals"));
45 DontPrint("disable-output", cl::desc("Don't output the .ll file"), cl::Hidden);
48 ShowAnnotations("show-annotations",
49 cl::desc("Add informational comments to the .ll file"));
53 class CommentWriter : public AssemblyAnnotationWriter {
55 void emitFunctionAnnot(const Function *F,
56 formatted_raw_ostream &OS) {
57 OS << "; [#uses=" << F->getNumUses() << ']'; // Output # uses
60 void printInfoComment(const Value &V, formatted_raw_ostream &OS) {
61 if (V.getType()->isVoidTy()) return;
64 OS << "; [#uses=" << V.getNumUses() << ']'; // Output # uses
68 } // end anon namespace
70 int main(int argc, char **argv) {
71 // Print a stack trace if we signal out.
72 sys::PrintStackTraceOnErrorSignal();
73 PrettyStackTraceProgram X(argc, argv);
75 LLVMContext &Context = getGlobalContext();
76 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
79 cl::ParseCommandLineOptions(argc, argv, "llvm .bc -> .ll disassembler\n");
81 std::string ErrorMessage;
82 std::auto_ptr<Module> M;
83 OwningPtr<MemoryBuffer> BufferPtr;
85 if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFilename, BufferPtr))
86 ErrorMessage = ec.message();
88 M.reset(ParseBitcodeFile(BufferPtr.take(), Context, &ErrorMessage));
91 errs() << argv[0] << ": ";
92 if (ErrorMessage.size())
93 errs() << ErrorMessage << "\n";
95 errs() << "bitcode didn't read correctly.\n";
99 // Just use stdout. We won't actually print anything on it.
101 OutputFilename = "-";
103 if (OutputFilename.empty()) { // Unspecified output, infer it.
104 if (InputFilename == "-") {
105 OutputFilename = "-";
107 const std::string &IFN = InputFilename;
108 int Len = IFN.length();
109 // If the source ends in .bc, strip it off.
110 if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c')
111 OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
113 OutputFilename = IFN+".ll";
117 std::string ErrorInfo;
118 OwningPtr<tool_output_file>
119 Out(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
120 raw_fd_ostream::F_Binary));
121 if (!ErrorInfo.empty()) {
122 errs() << ErrorInfo << '\n';
126 OwningPtr<AssemblyAnnotationWriter> Annotator;
128 Annotator.reset(new CommentWriter());
130 // All that llvm-dis does is write the assembly to a file.
132 M->print(Out->os(), Annotator.get());