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"
33 static cl::opt<std::string>
34 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
36 static cl::opt<std::string>
37 OutputFilename("o", cl::desc("Override output filename"),
38 cl::value_desc("filename"));
41 Force("f", cl::desc("Enable binary output on terminals"));
44 DontPrint("disable-output", cl::desc("Don't output the .ll file"), cl::Hidden);
47 ShowAnnotations("show-annotations",
48 cl::desc("Add informational comments to the .ll file"));
52 class CommentWriter : public AssemblyAnnotationWriter {
54 void emitFunctionAnnot(const Function *F,
55 formatted_raw_ostream &OS) {
56 OS << "; [#uses=" << F->getNumUses() << ']'; // Output # uses
59 void printInfoComment(const Value &V, formatted_raw_ostream &OS) {
60 if (V.getType()->isVoidTy()) return;
63 OS << "; [#uses=" << V.getNumUses() << ']'; // Output # uses
67 } // end anon namespace
69 int main(int argc, char **argv) {
70 // Print a stack trace if we signal out.
71 sys::PrintStackTraceOnErrorSignal();
72 PrettyStackTraceProgram X(argc, argv);
74 LLVMContext &Context = getGlobalContext();
75 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
78 cl::ParseCommandLineOptions(argc, argv, "llvm .bc -> .ll disassembler\n");
80 std::string ErrorMessage;
81 std::auto_ptr<Module> M;
83 if (MemoryBuffer *Buffer
84 = MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage)) {
85 M.reset(ParseBitcodeFile(Buffer, Context, &ErrorMessage));
90 errs() << argv[0] << ": ";
91 if (ErrorMessage.size())
92 errs() << ErrorMessage << "\n";
94 errs() << "bitcode didn't read correctly.\n";
98 // Just use stdout. We won't actually print anything on it.
100 OutputFilename = "-";
102 if (OutputFilename.empty()) { // Unspecified output, infer it.
103 if (InputFilename == "-") {
104 OutputFilename = "-";
106 const std::string &IFN = InputFilename;
107 int Len = IFN.length();
108 // If the source ends in .bc, strip it off.
109 if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c')
110 OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
112 OutputFilename = IFN+".ll";
116 std::string ErrorInfo;
117 OwningPtr<tool_output_file>
118 Out(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
119 raw_fd_ostream::F_Binary));
120 if (!ErrorInfo.empty()) {
121 errs() << ErrorInfo << '\n';
125 OwningPtr<AssemblyAnnotationWriter> Annotator;
127 Annotator.reset(new CommentWriter());
129 // All that llvm-dis does is write the assembly to a file.
131 M->print(Out->os(), Annotator.get());