summaryrefslogtreecommitdiff
path: root/tools/llvm-dwarfdump/llvm-dwarfdump.cpp
blob: e73300a0cd8d911ed720e23d392e8546716cab7f (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
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
//===-- llvm-dwarfdump.cpp - Debug info dumping utility for llvm ----------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This program is a utility that works like "dwarfdump".
//
//===----------------------------------------------------------------------===//

#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Object/RelocVisitor.h"
#include "llvm/DebugInfo/DIContext.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/MemoryObject.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/system_error.h"
#include <algorithm>
#include <cstring>
#include <list>
#include <string>

using namespace llvm;
using namespace object;

static cl::list<std::string>
InputFilenames(cl::Positional, cl::desc("<input object files>"),
               cl::ZeroOrMore);

static cl::opt<unsigned long long>
Address("address", cl::init(-1ULL),
        cl::desc("Print line information for a given address"));

static cl::opt<bool>
PrintFunctions("functions", cl::init(false),
               cl::desc("Print function names as well as line information "
                        "for a given address"));

static cl::opt<bool>
PrintInlining("inlining", cl::init(false),
              cl::desc("Print all inlined frames for a given address"));

static void PrintDILineInfo(DILineInfo dli) {
  if (PrintFunctions)
    outs() << (dli.getFunctionName() ? dli.getFunctionName() : "<unknown>")
           << "\n";
  outs() << (dli.getFileName() ? dli.getFileName() : "<unknown>") << ':'
         << dli.getLine() << ':' << dli.getColumn() << '\n';
}

static void DumpInput(const StringRef &Filename) {
  OwningPtr<MemoryBuffer> Buff;

  if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
    errs() << Filename << ": " << ec.message() << "\n";
    return;
  }

  OwningPtr<ObjectFile> Obj(ObjectFile::createObjectFile(Buff.take()));

  StringRef DebugInfoSection;
  RelocAddrMap RelocMap;
  StringRef DebugAbbrevSection;
  StringRef DebugLineSection;
  StringRef DebugArangesSection;
  StringRef DebugStringSection;
  StringRef DebugRangesSection;

  error_code ec;
  for (section_iterator i = Obj->begin_sections(),
                        e = Obj->end_sections();
                        i != e; i.increment(ec)) {
    StringRef name;
    i->getName(name);
    StringRef data;
    i->getContents(data);

    if (name.startswith("__DWARF,"))
      name = name.substr(8); // Skip "__DWARF," prefix.
    name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
    if (name == "debug_info")
      DebugInfoSection = data;
    else if (name == "debug_abbrev")
      DebugAbbrevSection = data;
    else if (name == "debug_line")
      DebugLineSection = data;
    else if (name == "debug_aranges")
      DebugArangesSection = data;
    else if (name == "debug_str")
      DebugStringSection = data;
    else if (name == "debug_ranges")
      DebugRangesSection = data;
    // Any more debug info sections go here.
    else
      continue;

    // TODO: For now only handle relocations for the debug_info section.
    if (name != "debug_info")
      continue;

    if (i->begin_relocations() != i->end_relocations()) {
      uint64_t SectionSize;
      i->getSize(SectionSize);
      for (relocation_iterator reloc_i = i->begin_relocations(),
                               reloc_e = i->end_relocations();
                               reloc_i != reloc_e; reloc_i.increment(ec)) {
        uint64_t Address;
        reloc_i->getAddress(Address);
        uint64_t Type;
        reloc_i->getType(Type);

        RelocVisitor V(Obj->getFileFormatName());
        // The section address is always 0 for debug sections.
        RelocToApply R(V.visit(Type, *reloc_i));
        if (V.error()) {
          SmallString<32> Name;
          error_code ec(reloc_i->getTypeName(Name));
          if (ec) {
            errs() << "Aaaaaa! Nameless relocation! Aaaaaa!\n";
          }
          errs() << "error: failed to compute relocation: "
                 << Name << "\n";
          continue;
        }

        if (Address + R.Width > SectionSize) {
          errs() << "error: " << R.Width << "-byte relocation starting "
                 << Address << " bytes into section " << name << " which is "
                 << SectionSize << " bytes long.\n";
          continue;
        }
        if (R.Width > 8) {
          errs() << "error: can't handle a relocation of more than 8 bytes at "
                    "a time.\n";
          continue;
        }
        DEBUG(dbgs() << "Writing " << format("%p", R.Value)
                     << " at " << format("%p", Address)
                     << " with width " << format("%d", R.Width)
                     << "\n");
        RelocMap[Address] = std::make_pair(R.Width, R.Value);
      }
    }
  }

  OwningPtr<DIContext> dictx(DIContext::getDWARFContext(/*FIXME*/true,
                                                        DebugInfoSection,
                                                        DebugAbbrevSection,
                                                        DebugArangesSection,
                                                        DebugLineSection,
                                                        DebugStringSection,
                                                        DebugRangesSection,
                                                        RelocMap));
  if (Address == -1ULL) {
    outs() << Filename
           << ":\tfile format " << Obj->getFileFormatName() << "\n\n";
    // Dump the complete DWARF structure.
    dictx->dump(outs());
  } else {
    // Print line info for the specified address.
    int SpecFlags = DILineInfoSpecifier::FileLineInfo |
                    DILineInfoSpecifier::AbsoluteFilePath;
    if (PrintFunctions)
      SpecFlags |= DILineInfoSpecifier::FunctionName;
    if (PrintInlining) {
      DIInliningInfo InliningInfo =
        dictx->getInliningInfoForAddress(Address, SpecFlags);
      uint32_t n = InliningInfo.getNumberOfFrames();
      if (n == 0) {
        // Print one empty debug line info in any case.
        PrintDILineInfo(DILineInfo());
      } else {
        for (uint32_t i = 0; i < n; i++) {
          DILineInfo dli = InliningInfo.getFrame(i);
          PrintDILineInfo(dli);
        }
      }
    } else {
      DILineInfo dli = dictx->getLineInfoForAddress(Address, SpecFlags);
      PrintDILineInfo(dli);
    }
  }
}

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

  cl::ParseCommandLineOptions(argc, argv, "llvm dwarf dumper\n");

  // Defaults to a.out if no filenames specified.
  if (InputFilenames.size() == 0)
    InputFilenames.push_back("a.out");

  std::for_each(InputFilenames.begin(), InputFilenames.end(), DumpInput);

  return 0;
}