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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 <string>
33 #include <system_error>
34
35 using namespace llvm;
36 using namespace object;
37
38 static cl::list<std::string>
39 InputFilenames(cl::Positional, cl::desc("<input object files or .dSYM bundles>"),
40                cl::ZeroOrMore);
41
42 static cl::opt<DIDumpType> DumpType(
43     "debug-dump", cl::init(DIDT_All), cl::desc("Dump of debug sections:"),
44     cl::values(
45         clEnumValN(DIDT_All, "all", "Dump all debug sections"),
46         clEnumValN(DIDT_Abbrev, "abbrev", ".debug_abbrev"),
47         clEnumValN(DIDT_AbbrevDwo, "abbrev.dwo", ".debug_abbrev.dwo"),
48         clEnumValN(DIDT_AppleNames, "apple_names", ".apple_names"),
49         clEnumValN(DIDT_AppleTypes, "apple_types", ".apple_types"),
50         clEnumValN(DIDT_AppleNamespaces, "apple_namespaces",
51                    ".apple_namespaces"),
52         clEnumValN(DIDT_AppleObjC, "apple_objc", ".apple_objc"),
53         clEnumValN(DIDT_Aranges, "aranges", ".debug_aranges"),
54         clEnumValN(DIDT_Info, "info", ".debug_info"),
55         clEnumValN(DIDT_InfoDwo, "info.dwo", ".debug_info.dwo"),
56         clEnumValN(DIDT_Types, "types", ".debug_types"),
57         clEnumValN(DIDT_TypesDwo, "types.dwo", ".debug_types.dwo"),
58         clEnumValN(DIDT_Line, "line", ".debug_line"),
59         clEnumValN(DIDT_LineDwo, "line.dwo", ".debug_line.dwo"),
60         clEnumValN(DIDT_Loc, "loc", ".debug_loc"),
61         clEnumValN(DIDT_LocDwo, "loc.dwo", ".debug_loc.dwo"),
62         clEnumValN(DIDT_Frames, "frames", ".debug_frame"),
63         clEnumValN(DIDT_Macro, "macro", ".debug_macinfo"),
64         clEnumValN(DIDT_Ranges, "ranges", ".debug_ranges"),
65         clEnumValN(DIDT_Pubnames, "pubnames", ".debug_pubnames"),
66         clEnumValN(DIDT_Pubtypes, "pubtypes", ".debug_pubtypes"),
67         clEnumValN(DIDT_GnuPubnames, "gnu_pubnames", ".debug_gnu_pubnames"),
68         clEnumValN(DIDT_GnuPubtypes, "gnu_pubtypes", ".debug_gnu_pubtypes"),
69         clEnumValN(DIDT_Str, "str", ".debug_str"),
70         clEnumValN(DIDT_StrDwo, "str.dwo", ".debug_str.dwo"),
71         clEnumValN(DIDT_StrOffsetsDwo, "str_offsets.dwo",
72                    ".debug_str_offsets.dwo"),
73         clEnumValN(DIDT_CUIndex, "cu_index", ".debug_cu_index"),
74         clEnumValN(DIDT_GdbIndex, "gdb_index", ".gdb_index"),
75         clEnumValN(DIDT_TUIndex, "tu_index", ".debug_tu_index")));
76
77 static cl::opt<bool>
78     SummarizeTypes("summarize-types",
79                    cl::desc("Abbreviate the description of type unit entries"));
80
81 static cl::opt<bool> Verify("verify", cl::desc("Verify the DWARF debug info"));
82
83 static cl::opt<bool> Quiet("quiet",
84                            cl::desc("Use with -verify to not emit to STDOUT."));
85
86 static void error(StringRef Filename, std::error_code EC) {
87   if (!EC)
88     return;
89   errs() << Filename << ": " << EC.message() << "\n";
90   exit(1);
91 }
92
93 static void DumpObjectFile(ObjectFile &Obj, Twine Filename) {
94   std::unique_ptr<DIContext> DICtx(new DWARFContextInMemory(Obj));
95
96   outs() << Filename.str() << ":\tfile format " << Obj.getFileFormatName()
97          << "\n\n";
98   // Dump the complete DWARF structure.
99   DICtx->dump(outs(), DumpType, false, SummarizeTypes);
100 }
101
102 static void DumpInput(StringRef Filename) {
103   ErrorOr<std::unique_ptr<MemoryBuffer>> BuffOrErr =
104       MemoryBuffer::getFileOrSTDIN(Filename);
105   error(Filename, BuffOrErr.getError());
106   std::unique_ptr<MemoryBuffer> Buff = std::move(BuffOrErr.get());
107
108   Expected<std::unique_ptr<Binary>> BinOrErr =
109       object::createBinary(Buff->getMemBufferRef());
110   if (!BinOrErr)
111     error(Filename, errorToErrorCode(BinOrErr.takeError()));
112
113   if (auto *Obj = dyn_cast<ObjectFile>(BinOrErr->get()))
114     DumpObjectFile(*Obj, Filename);
115   else if (auto *Fat = dyn_cast<MachOUniversalBinary>(BinOrErr->get()))
116     for (auto &ObjForArch : Fat->objects()) {
117       auto MachOOrErr = ObjForArch.getAsObjectFile();
118       error(Filename, errorToErrorCode(MachOOrErr.takeError()));
119       DumpObjectFile(**MachOOrErr,
120                      Filename + " (" + ObjForArch.getArchFlagName() + ")");
121     }
122 }
123
124 static bool VerifyObjectFile(ObjectFile &Obj, Twine Filename) {
125   std::unique_ptr<DIContext> DICtx(new DWARFContextInMemory(Obj));
126   
127   // Verify the DWARF and exit with non-zero exit status if verification
128   // fails.
129   raw_ostream &stream = Quiet ? nulls() : outs();
130   stream << "Verifying " << Filename.str() << ":\tfile format "
131   << Obj.getFileFormatName() << "\n";
132   bool Result = DICtx->verify(stream, DumpType);
133   if (Result)
134     stream << "No errors.\n";
135   else
136     stream << "Errors detected.\n";
137   return Result;
138 }
139
140 static bool VerifyInput(StringRef Filename) {
141   ErrorOr<std::unique_ptr<MemoryBuffer>> BuffOrErr =
142   MemoryBuffer::getFileOrSTDIN(Filename);
143   error(Filename, BuffOrErr.getError());
144   std::unique_ptr<MemoryBuffer> Buff = std::move(BuffOrErr.get());
145   
146   Expected<std::unique_ptr<Binary>> BinOrErr =
147   object::createBinary(Buff->getMemBufferRef());
148   if (!BinOrErr)
149     error(Filename, errorToErrorCode(BinOrErr.takeError()));
150   
151   bool Result = true;
152   if (auto *Obj = dyn_cast<ObjectFile>(BinOrErr->get()))
153     Result = VerifyObjectFile(*Obj, Filename);
154   else if (auto *Fat = dyn_cast<MachOUniversalBinary>(BinOrErr->get()))
155     for (auto &ObjForArch : Fat->objects()) {
156       auto MachOOrErr = ObjForArch.getAsObjectFile();
157       error(Filename, errorToErrorCode(MachOOrErr.takeError()));
158       if (!VerifyObjectFile(**MachOOrErr, Filename + " (" + ObjForArch.getArchFlagName() + ")"))
159         Result = false;
160     }
161   return Result;
162 }
163
164 /// If the input path is a .dSYM bundle (as created by the dsymutil tool),
165 /// replace it with individual entries for each of the object files inside the
166 /// bundle otherwise return the input path.
167 static std::vector<std::string> expandBundle(const std::string &InputPath) {
168   std::vector<std::string> BundlePaths;
169   SmallString<256> BundlePath(InputPath);
170   // Manually open up the bundle to avoid introducing additional dependencies.
171   if (sys::fs::is_directory(BundlePath) &&
172       sys::path::extension(BundlePath) == ".dSYM") {
173     std::error_code EC;
174     sys::path::append(BundlePath, "Contents", "Resources", "DWARF");
175     for (sys::fs::directory_iterator Dir(BundlePath, EC), DirEnd;
176          Dir != DirEnd && !EC; Dir.increment(EC)) {
177       const std::string &Path = Dir->path();
178       sys::fs::file_status Status;
179       EC = sys::fs::status(Path, Status);
180       error(Path, EC);
181       switch (Status.type()) {
182       case sys::fs::file_type::regular_file:
183       case sys::fs::file_type::symlink_file:
184       case sys::fs::file_type::type_unknown:
185         BundlePaths.push_back(Path);
186         break;
187       default: /*ignore*/;
188       }
189     }
190     error(BundlePath, EC);
191   }
192   if (!BundlePaths.size())
193     BundlePaths.push_back(InputPath);
194   return BundlePaths;
195 }
196
197 int main(int argc, char **argv) {
198   // Print a stack trace if we signal out.
199   sys::PrintStackTraceOnErrorSignal(argv[0]);
200   PrettyStackTraceProgram X(argc, argv);
201   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
202
203   cl::ParseCommandLineOptions(argc, argv, "llvm dwarf dumper\n");
204
205   // Defaults to a.out if no filenames specified.
206   if (InputFilenames.size() == 0)
207     InputFilenames.push_back("a.out");
208
209   // Expand any .dSYM bundles to the individual object files contained therein.
210   std::vector<std::string> Objects;
211   for (const auto &F : InputFilenames) {
212     auto Objs = expandBundle(F);
213     Objects.insert(Objects.end(), Objs.begin(), Objs.end());
214   }
215
216   if (Verify) {
217     // If we encountered errors during verify, exit with a non-zero exit status.
218     if (!std::all_of(Objects.begin(), Objects.end(), VerifyInput))
219       exit(1);
220   } else {
221     std::for_each(Objects.begin(), Objects.end(), DumpInput);
222   }
223
224   return EXIT_SUCCESS;
225 }