1//===-- llvm-dwarfdump.cpp - Debug info dumping utility for llvm -----------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This program is a utility that works like "dwarfdump".
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/ADT/OwningPtr.h"
15#include "llvm/ADT/Triple.h"
16#include "llvm/ADT/STLExtras.h"
17#include "llvm/Object/ObjectFile.h"
18#include "llvm/DebugInfo/DIContext.h"
19#include "llvm/Support/CommandLine.h"
20#include "llvm/Support/Debug.h"
21#include "llvm/Support/Format.h"
22#include "llvm/Support/ManagedStatic.h"
23#include "llvm/Support/MemoryBuffer.h"
24#include "llvm/Support/MemoryObject.h"
25#include "llvm/Support/PrettyStackTrace.h"
26#include "llvm/Support/Signals.h"
27#include "llvm/Support/raw_ostream.h"
28#include "llvm/Support/system_error.h"
29#include <algorithm>
30#include <cstring>
31using namespace llvm;
32using namespace object;
33
34static cl::list<std::string>
35InputFilenames(cl::Positional, cl::desc("<input object files>"),
36               cl::ZeroOrMore);
37
38static cl::opt<unsigned long long>
39Address("address", cl::init(-1ULL),
40        cl::desc("Print line information for a given address"));
41
42static void DumpInput(const StringRef &Filename) {
43  OwningPtr<MemoryBuffer> Buff;
44
45  if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
46    errs() << Filename << ": " << ec.message() << "\n";
47    return;
48  }
49
50  OwningPtr<ObjectFile> Obj(ObjectFile::createObjectFile(Buff.take()));
51
52  StringRef DebugInfoSection;
53  StringRef DebugAbbrevSection;
54  StringRef DebugLineSection;
55  StringRef DebugArangesSection;
56  StringRef DebugStringSection;
57
58  error_code ec;
59  for (section_iterator i = Obj->begin_sections(),
60                        e = Obj->end_sections();
61                        i != e; i.increment(ec)) {
62    StringRef name;
63    i->getName(name);
64    StringRef data;
65    i->getContents(data);
66
67    if (name.startswith("__DWARF,"))
68      name = name.substr(8); // Skip "__DWARF," prefix.
69    name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
70    if (name == "debug_info")
71      DebugInfoSection = data;
72    else if (name == "debug_abbrev")
73      DebugAbbrevSection = data;
74    else if (name == "debug_line")
75      DebugLineSection = data;
76    else if (name == "debug_aranges")
77      DebugArangesSection = data;
78    else if (name == "debug_str")
79      DebugStringSection = data;
80  }
81
82  OwningPtr<DIContext> dictx(DIContext::getDWARFContext(/*FIXME*/true,
83                                                        DebugInfoSection,
84                                                        DebugAbbrevSection,
85                                                        DebugArangesSection,
86                                                        DebugLineSection,
87                                                        DebugStringSection));
88  if (Address == -1ULL) {
89    outs() << Filename
90           << ":\tfile format " << Obj->getFileFormatName() << "\n\n";
91    // Dump the complete DWARF structure.
92    dictx->dump(outs());
93  } else {
94    // Print line info for the specified address.
95    DILineInfo dli = dictx->getLineInfoForAddress(Address);
96    outs() << (dli.getFileName() ? dli.getFileName() : "<unknown>") << ':'
97           << dli.getLine() << ':' << dli.getColumn() << '\n';
98  }
99}
100
101int main(int argc, char **argv) {
102  // Print a stack trace if we signal out.
103  sys::PrintStackTraceOnErrorSignal();
104  PrettyStackTraceProgram X(argc, argv);
105  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
106
107  cl::ParseCommandLineOptions(argc, argv, "llvm dwarf dumper\n");
108
109  // Defaults to a.out if no filenames specified.
110  if (InputFilenames.size() == 0)
111    InputFilenames.push_back("a.out");
112
113  std::for_each(InputFilenames.begin(), InputFilenames.end(), DumpInput);
114
115  return 0;
116}
117