aboutsummaryrefslogtreecommitdiffstats
path: root/tools/llvm-dis/llvm-dis.cpp
blob: 7453d9e9f457093543334a45aff6a898ee026cbe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
//===-- llvm-dis.cpp - The low-level LLVM disassembler --------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This utility may be invoked in the following manner:
//  llvm-dis [options]      - Read LLVM bitcode from stdin, write asm to stdout
//  llvm-dis [options] x.bc - Read LLVM bitcode from the x.bc file, write asm
//                            to the x.ll file.
//  Options:
//      --help   - Output information about command line switches
//
//===----------------------------------------------------------------------===//

#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Analysis/DebugInfo.h"
#include "llvm/Assembly/AssemblyAnnotationWriter.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/system_error.h"
using namespace llvm;

static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));

static cl::opt<std::string>
OutputFilename("o", cl::desc("Override output filename"),
               cl::value_desc("filename"));

static cl::opt<bool>
Force("f", cl::desc("Enable binary output on terminals"));

static cl::opt<bool>
DontPrint("disable-output", cl::desc("Don't output the .ll file"), cl::Hidden);

static cl::opt<bool>
ShowAnnotations("show-annotations",
                cl::desc("Add informational comments to the .ll file"));

namespace {

static void printDebugLoc(const DebugLoc &DL, formatted_raw_ostream &OS) {
  OS << DL.getLine() << ":" << DL.getCol();
  if (MDNode *N = DL.getInlinedAt(getGlobalContext())) {
    DebugLoc IDL = DebugLoc::getFromDILocation(N);
    if (!IDL.isUnknown()) {
      OS << "@";
      printDebugLoc(IDL,OS);
    }
  }
}
class CommentWriter : public AssemblyAnnotationWriter {
public:
  void emitFunctionAnnot(const Function *F,
                         formatted_raw_ostream &OS) {
    OS << "; [#uses=" << F->getNumUses() << ']';  // Output # uses
    OS << '\n';
  }
  void printInfoComment(const Value &V, formatted_raw_ostream &OS) {
    bool Padded = false;
    if (!V.getType()->isVoidTy()) {
      OS.PadToColumn(50);
      Padded = true;
      OS << "; [#uses=" << V.getNumUses() << " type=" << V.getType()->getDescription() << "]";  // Output # uses and type
    }
    if (const Instruction *I = dyn_cast<Instruction>(&V)) {
      const DebugLoc &DL = I->getDebugLoc();
      if (!DL.isUnknown()) {
        if (!Padded) {
          OS.PadToColumn(50);
          Padded = true;
          OS << ";";
        }
        OS << " [debug line = ";
        printDebugLoc(DL,OS);
        OS << "]";
      }
      if (const DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(I)) {
        DIVariable Var(DDI->getVariable());
        if (!Padded) {
          OS.PadToColumn(50);
          Padded = true;
          OS << ";";
        }
        OS << " [debug variable = " << Var.getName() << "]";
      }
      else if (const DbgValueInst *DVI = dyn_cast<DbgValueInst>(I)) {
        DIVariable Var(DVI->getVariable());
        if (!Padded) {
          OS.PadToColumn(50);
          Padded = true;
          OS << ";";
        }
        OS << " [debug variable = " << Var.getName() << "]";
      }
    }
  }
};

} // end anon namespace

int main(int argc, char **argv) {
  // Print a stack trace if we signal out.
  sys::PrintStackTraceOnErrorSignal();
  PrettyStackTraceProgram X(argc, argv);

  LLVMContext &Context = getGlobalContext();
  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.


  cl::ParseCommandLineOptions(argc, argv, "llvm .bc -> .ll disassembler\n");

  std::string ErrorMessage;
  std::auto_ptr<Module> M;

  {
    OwningPtr<MemoryBuffer> BufferPtr;
    if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFilename, BufferPtr))
      ErrorMessage = ec.message();
    else
      M.reset(ParseBitcodeFile(BufferPtr.get(), Context, &ErrorMessage));
  }

  if (M.get() == 0) {
    errs() << argv[0] << ": ";
    if (ErrorMessage.size())
      errs() << ErrorMessage << "\n";
    else
      errs() << "bitcode didn't read correctly.\n";
    return 1;
  }

  // Just use stdout.  We won't actually print anything on it.
  if (DontPrint)
    OutputFilename = "-";

  if (OutputFilename.empty()) { // Unspecified output, infer it.
    if (InputFilename == "-") {
      OutputFilename = "-";
    } else {
      const std::string &IFN = InputFilename;
      int Len = IFN.length();
      // If the source ends in .bc, strip it off.
      if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c')
        OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
      else
        OutputFilename = IFN+".ll";
    }
  }

  std::string ErrorInfo;
  OwningPtr<tool_output_file>
  Out(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
                           raw_fd_ostream::F_Binary));
  if (!ErrorInfo.empty()) {
    errs() << ErrorInfo << '\n';
    return 1;
  }

  OwningPtr<AssemblyAnnotationWriter> Annotator;
  if (ShowAnnotations)
    Annotator.reset(new CommentWriter());

  // All that llvm-dis does is write the assembly to a file.
  if (!DontPrint)
    M->print(Out->os(), Annotator.get());

  // Declare success.
  Out->keep();

  return 0;
}