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/IR/LLVMContext.h"
20 #include "llvm/Assembly/AssemblyAnnotationWriter.h"
21 #include "llvm/Bitcode/ReaderWriter.h"
22 #include "llvm/DebugInfo.h"
23 #include "llvm/IR/IntrinsicInst.h"
24 #include "llvm/IR/Module.h"
25 #include "llvm/IR/Type.h"
26 #include "llvm/Support/CommandLine.h"
27 #include "llvm/Support/DataStream.h"
28 #include "llvm/Support/FormattedStream.h"
29 #include "llvm/Support/ManagedStatic.h"
30 #include "llvm/Support/MemoryBuffer.h"
31 #include "llvm/Support/PrettyStackTrace.h"
32 #include "llvm/Support/Signals.h"
33 #include "llvm/Support/ToolOutputFile.h"
34 #include "llvm/Support/system_error.h"
37 static cl::opt<std::string>
38 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
40 static cl::opt<std::string>
41 OutputFilename("o", cl::desc("Override output filename"),
42 cl::value_desc("filename"));
45 Force("f", cl::desc("Enable binary output on terminals"));
48 DontPrint("disable-output", cl::desc("Don't output the .ll file"), cl::Hidden);
51 ShowAnnotations("show-annotations",
52 cl::desc("Add informational comments to the .ll file"));
56 static void printDebugLoc(const DebugLoc &DL, formatted_raw_ostream &OS) {
57 OS << DL.getLine() << ":" << DL.getCol();
58 if (MDNode *N = DL.getInlinedAt(getGlobalContext())) {
59 DebugLoc IDL = DebugLoc::getFromDILocation(N);
60 if (!IDL.isUnknown()) {
62 printDebugLoc(IDL,OS);
66 class CommentWriter : public AssemblyAnnotationWriter {
68 void emitFunctionAnnot(const Function *F,
69 formatted_raw_ostream &OS) {
70 OS << "; [#uses=" << F->getNumUses() << ']'; // Output # uses
73 void printInfoComment(const Value &V, formatted_raw_ostream &OS) {
75 if (!V.getType()->isVoidTy()) {
78 OS << "; [#uses=" << V.getNumUses() << " type=" << *V.getType() << "]"; // Output # uses and type
80 if (const Instruction *I = dyn_cast<Instruction>(&V)) {
81 const DebugLoc &DL = I->getDebugLoc();
82 if (!DL.isUnknown()) {
88 OS << " [debug line = ";
92 if (const DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(I)) {
93 DIVariable Var(DDI->getVariable());
98 OS << " [debug variable = " << Var.getName() << "]";
100 else if (const DbgValueInst *DVI = dyn_cast<DbgValueInst>(I)) {
101 DIVariable Var(DVI->getVariable());
106 OS << " [debug variable = " << Var.getName() << "]";
112 } // end anon namespace
114 int main(int argc, char **argv) {
115 // Print a stack trace if we signal out.
116 sys::PrintStackTraceOnErrorSignal();
117 PrettyStackTraceProgram X(argc, argv);
119 LLVMContext &Context = getGlobalContext();
120 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
123 cl::ParseCommandLineOptions(argc, argv, "llvm .bc -> .ll disassembler\n");
125 std::string ErrorMessage;
128 // Use the bitcode streaming interface
129 DataStreamer *streamer = getDataFileStreamer(InputFilename, &ErrorMessage);
131 std::string DisplayFilename;
132 if (InputFilename == "-")
133 DisplayFilename = "<stdin>";
135 DisplayFilename = InputFilename;
136 M.reset(getStreamedBitcodeModule(DisplayFilename, streamer, Context,
138 if(M.get() != 0 && M->MaterializeAllPermanently(&ErrorMessage)) {
144 errs() << argv[0] << ": ";
145 if (ErrorMessage.size())
146 errs() << ErrorMessage << "\n";
148 errs() << "bitcode didn't read correctly.\n";
152 // Just use stdout. We won't actually print anything on it.
154 OutputFilename = "-";
156 if (OutputFilename.empty()) { // Unspecified output, infer it.
157 if (InputFilename == "-") {
158 OutputFilename = "-";
160 const std::string &IFN = InputFilename;
161 int Len = IFN.length();
162 // If the source ends in .bc, strip it off.
163 if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c')
164 OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
166 OutputFilename = IFN+".ll";
170 std::string ErrorInfo;
171 OwningPtr<tool_output_file> Out(new tool_output_file(
172 OutputFilename.c_str(), ErrorInfo, sys::fs::F_Binary));
173 if (!ErrorInfo.empty()) {
174 errs() << ErrorInfo << '\n';
178 OwningPtr<AssemblyAnnotationWriter> Annotator;
180 Annotator.reset(new CommentWriter());
182 // All that llvm-dis does is write the assembly to a file.
184 M->print(Out->os(), Annotator.get());