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;
83 std::auto_ptr<Module> M;
84 OwningPtr<MemoryBuffer> BufferPtr;
86 if ((ec = MemoryBuffer::getFileOrSTDIN(InputFilename, BufferPtr)))
87 ErrorMessage = ec.message();
89 M.reset(ParseBitcodeFile(BufferPtr.get(), Context, &ErrorMessage));
90 (void) BufferPtr.take();
93 errs() << argv[0] << ": ";
94 if (ErrorMessage.size())
95 errs() << ErrorMessage << "\n";
97 errs() << "bitcode didn't read correctly.\n";
101 // Just use stdout. We won't actually print anything on it.
103 OutputFilename = "-";
105 if (OutputFilename.empty()) { // Unspecified output, infer it.
106 if (InputFilename == "-") {
107 OutputFilename = "-";
109 const std::string &IFN = InputFilename;
110 int Len = IFN.length();
111 // If the source ends in .bc, strip it off.
112 if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c')
113 OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
115 OutputFilename = IFN+".ll";
119 std::string ErrorInfo;
120 OwningPtr<tool_output_file>
121 Out(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
122 raw_fd_ostream::F_Binary));
123 if (!ErrorInfo.empty()) {
124 errs() << ErrorInfo << '\n';
128 OwningPtr<AssemblyAnnotationWriter> Annotator;
130 Annotator.reset(new CommentWriter());
132 // All that llvm-dis does is write the assembly to a file.
134 M->print(Out->os(), Annotator.get());