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/STLExtras.h"
  15 #include "llvm/ADT/Triple.h"
  16 #include "llvm/DebugInfo/DIContext.h"
  17 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
  18 #include "llvm/Object/MachOUniversal.h"
  19 #include "llvm/Object/ObjectFile.h"
  20 #include "llvm/Object/RelocVisitor.h"
  21 #include "llvm/Support/CommandLine.h"
  22 #include "llvm/Support/Debug.h"
  23 #include "llvm/Support/Format.h"
  24 #include "llvm/Support/ManagedStatic.h"
  25 #include "llvm/Support/MemoryBuffer.h"
  26 #include "llvm/Support/Path.h"
  27 #include "llvm/Support/PrettyStackTrace.h"
  28 #include "llvm/Support/Signals.h"
  29 #include "llvm/Support/raw_ostream.h"
  30 #include <algorithm>
  31 #include <cstring>
  32 #include <list>
  33 #include <string>
  34 #include <system_error>
  35
  36 using namespace llvm;
  37 using namespace object;
  38
  39 static cl::list<std::string>
  40 InputFilenames(cl::Positional, cl::desc("<input object files or .dSYM bundles>"),
  41                cl::ZeroOrMore);
  42
  43 static cl::opt<DIDumpType> DumpType(
  44     "debug-dump", cl::init(DIDT_All), cl::desc("Dump of debug sections:"),
  45     cl::values(
  46         clEnumValN(DIDT_All, "all", "Dump all debug sections"),
  47         clEnumValN(DIDT_Abbrev, "abbrev", ".debug_abbrev"),
  48         clEnumValN(DIDT_AbbrevDwo, "abbrev.dwo", ".debug_abbrev.dwo"),
  49         clEnumValN(DIDT_AppleNames, "apple_names", ".apple_names"),
  50         clEnumValN(DIDT_AppleTypes, "apple_types", ".apple_types"),
  51         clEnumValN(DIDT_AppleNamespaces, "apple_namespaces",
  52                    ".apple_namespaces"),
  53         clEnumValN(DIDT_AppleObjC, "apple_objc", ".apple_objc"),
  54         clEnumValN(DIDT_Aranges, "aranges", ".debug_aranges"),
  55         clEnumValN(DIDT_Info, "info", ".debug_info"),
  56         clEnumValN(DIDT_InfoDwo, "info.dwo", ".debug_info.dwo"),
  57         clEnumValN(DIDT_Types, "types", ".debug_types"),
  58         clEnumValN(DIDT_TypesDwo, "types.dwo", ".debug_types.dwo"),
  59         clEnumValN(DIDT_Line, "line", ".debug_line"),
  60         clEnumValN(DIDT_LineDwo, "line.dwo", ".debug_line.dwo"),
  61         clEnumValN(DIDT_Loc, "loc", ".debug_loc"),
  62         clEnumValN(DIDT_LocDwo, "loc.dwo", ".debug_loc.dwo"),
  63         clEnumValN(DIDT_Frames, "frames", ".debug_frame"),
  64         clEnumValN(DIDT_Macro, "macro", ".debug_macinfo"),
  65         clEnumValN(DIDT_Ranges, "ranges", ".debug_ranges"),
  66         clEnumValN(DIDT_Pubnames, "pubnames", ".debug_pubnames"),
  67         clEnumValN(DIDT_Pubtypes, "pubtypes", ".debug_pubtypes"),
  68         clEnumValN(DIDT_GnuPubnames, "gnu_pubnames", ".debug_gnu_pubnames"),
  69         clEnumValN(DIDT_GnuPubtypes, "gnu_pubtypes", ".debug_gnu_pubtypes"),
  70         clEnumValN(DIDT_Str, "str", ".debug_str"),
  71         clEnumValN(DIDT_StrDwo, "str.dwo", ".debug_str.dwo"),
  72         clEnumValN(DIDT_StrOffsetsDwo, "str_offsets.dwo",
  73                    ".debug_str_offsets.dwo"),
  74         clEnumValN(DIDT_CUIndex, "cu_index", ".debug_cu_index"),
  75         clEnumValN(DIDT_TUIndex, "tu_index", ".debug_tu_index"), clEnumValEnd));
  76
  77 static void error(StringRef Filename, std::error_code EC) {
  78   if (!EC)
  79     return;
  80   errs() << Filename << ": " << EC.message() << "\n";
  81   exit(1);
  82 }
  83
  84 static void DumpObjectFile(ObjectFile &Obj, Twine Filename) {
  85   std::unique_ptr<DIContext> DICtx(new DWARFContextInMemory(Obj));
  86
  87   outs() << Filename.str() << ":\tfile format " << Obj.getFileFormatName()
  88          << "\n\n";
  89   // Dump the complete DWARF structure.
  90   DICtx->dump(outs(), DumpType);
  91 }
  92
  93 static void DumpInput(StringRef Filename) {
  94   ErrorOr<std::unique_ptr<MemoryBuffer>> BuffOrErr =
  95       MemoryBuffer::getFileOrSTDIN(Filename);
  96   error(Filename, BuffOrErr.getError());
  97   std::unique_ptr<MemoryBuffer> Buff = std::move(BuffOrErr.get());
  98
  99   ErrorOr<std::unique_ptr<Binary>> BinOrErr =
 100       object::createBinary(Buff->getMemBufferRef());
 101   error(Filename, BinOrErr.getError());
 102
 103   if (auto *Obj = dyn_cast<ObjectFile>(BinOrErr->get()))
 104     DumpObjectFile(*Obj, Filename);
 105   else if (auto *Fat = dyn_cast<MachOUniversalBinary>(BinOrErr->get()))
 106     for (auto &ObjForArch : Fat->objects()) {
 107       auto MachOOrErr = ObjForArch.getAsObjectFile();
 108       error(Filename, MachOOrErr.getError());
 109       DumpObjectFile(**MachOOrErr,
 110                      Filename + " (" + ObjForArch.getArchTypeName() + ")");
 111     }
 112 }
 113
 114 /// If the input path is a .dSYM bundle (as created by the dsymutil tool),
 115 /// replace it with individual entries for each of the object files inside the
 116 /// bundle otherwise return the input path.
 117 static std::vector<std::string> expandBundle(std::string InputPath) {
 118   std::vector<std::string> BundlePaths;
 119   SmallString<256> BundlePath(InputPath);
 120   // Manually open up the bundle to avoid introducing additional dependencies.
 121   if (sys::fs::is_directory(BundlePath) &&
 122       sys::path::extension(BundlePath) == ".dSYM") {
 123     std::error_code EC;
 124     sys::path::append(BundlePath, "Contents", "Resources", "DWARF");
 125     for (sys::fs::directory_iterator Dir(BundlePath, EC), DirEnd;
 126          Dir != DirEnd && !EC; Dir.increment(EC)) {
 127       const std::string &Path = Dir->path();
 128       sys::fs::file_status Status;
 129       EC = sys::fs::status(Path, Status);
 130       error(Path, EC);
 131       switch (Status.type()) {
 132       case sys::fs::file_type::regular_file:
 133       case sys::fs::file_type::symlink_file:
 134       case sys::fs::file_type::type_unknown:
 135         BundlePaths.push_back(Path);
 136         break;
 137       default: /*ignore*/;
 138       }
 139     }
 140     error(BundlePath, EC);
 141   }
 142   if (!BundlePaths.size())
 143     BundlePaths.push_back(InputPath);
 144   return BundlePaths;
 145 }
 146
 147 int main(int argc, char **argv) {
 148   // Print a stack trace if we signal out.
 149   sys::PrintStackTraceOnErrorSignal();
 150   PrettyStackTraceProgram X(argc, argv);
 151   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
 152
 153   cl::ParseCommandLineOptions(argc, argv, "llvm dwarf dumper\n");
 154
 155   // Defaults to a.out if no filenames specified.
 156   if (InputFilenames.size() == 0)
 157     InputFilenames.push_back("a.out");
 158
 159   // Expand any .dSYM bundles to the individual object files contained therein.
 160   std::vector<std::string> Objects;
 161   for (auto F : InputFilenames) {
 162     auto Objs = expandBundle(F);
 163     Objects.insert(Objects.end(), Objs.begin(), Objs.end());
 164   }
 165
 166   std::for_each(Objects.begin(), Objects.end(), DumpInput);
 167
 168   return EXIT_SUCCESS;
 169 }