tools/llvm-dwarfdump/llvm-dwarfdump.cpp

   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>
  31 using namespace llvm;
  32 using namespace object;
  33
  34 static cl::list<std::string>
  35 InputFilenames(cl::Positional, cl::desc("<input object files>"),
  36                cl::ZeroOrMore);
  37
  38 static void DumpInput(const StringRef &Filename) {
  39   OwningPtr<MemoryBuffer> Buff;
  40
  41   if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
  42     errs() << Filename << ": " << ec.message() << "\n";
  43     return;
  44   }
  45
  46   OwningPtr<ObjectFile> Obj(ObjectFile::createObjectFile(Buff.take()));
  47
  48   outs() << '\n';
  49   outs() << Filename
  50          << ":\tfile format " << Obj->getFileFormatName() << "\n\n";
  51
  52   StringRef DebugInfoSection;
  53   StringRef DebugAbbrevSection;
  54   StringRef DebugLineSection;
  55   StringRef DebugArangesSection;
  56
  57   error_code ec;
  58   for (ObjectFile::section_iterator i = Obj->begin_sections(),
  59                                     e = Obj->end_sections();
  60                                     i != e; i.increment(ec)) {
  61     StringRef name;
  62     i->getName(name);
  63     StringRef data;
  64     i->getContents(data);
  65
  66     if (name.startswith("__DWARF,"))
  67       name = name.substr(8); // Skip "__DWARF," prefix.
  68     name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
  69     if (name == "debug_info")
  70       DebugInfoSection = data;
  71     else if (name == "debug_abbrev")
  72       DebugAbbrevSection = data;
  73     else if (name == "debug_line")
  74       DebugLineSection = data;
  75     else if (name == "debug_aranges")
  76       DebugArangesSection = data;
  77   }
  78
  79   OwningPtr<DIContext> dictx(DIContext::getDWARFContext(/*FIXME*/true,
  80                                                         DebugInfoSection,
  81                                                         DebugAbbrevSection,
  82                                                         DebugArangesSection,
  83                                                         DebugLineSection));
  84   dictx->dump(outs());
  85 }
  86
  87 int main(int argc, char **argv) {
  88   // Print a stack trace if we signal out.
  89   sys::PrintStackTraceOnErrorSignal();
  90   PrettyStackTraceProgram X(argc, argv);
  91   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
  92
  93   cl::ParseCommandLineOptions(argc, argv, "llvm dwarf dumper\n");
  94
  95   // Defaults to a.out if no filenames specified.
  96   if (InputFilenames.size() == 0)
  97     InputFilenames.push_back("a.out");
  98
  99   std::for_each(InputFilenames.begin(), InputFilenames.end(), DumpInput);
 100
 101   return 0;
 102 }