xref: /llvm-project/llvm/tools/llvm-readobj/llvm-readobj.cpp (revision 4dfcc4a7882f5e6d6e66d3c535c01edb3c56053d) 
1 //===- llvm-readobj.cpp - Dump contents of an Object File -----------------===//
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 is a tool similar to readelf, except it works on multiple object file
11 // formats. The main purpose of this tool is to provide detailed output suitable
12 // for FileCheck.
13 //
14 // Flags should be similar to readelf where supported, but the output format
15 // does not need to be identical. The point is to not make users learn yet
16 // another set of flags.
17 //
18 // Output should be specialized for each format where appropriate.
19 //
20 //===----------------------------------------------------------------------===//
21 
22 #include "llvm-readobj.h"
23 #include "Error.h"
24 #include "ObjDumper.h"
25 #include "WindowsResourceDumper.h"
26 #include "llvm/DebugInfo/CodeView/MergingTypeTableBuilder.h"
27 #include "llvm/Object/Archive.h"
28 #include "llvm/Object/COFFImportFile.h"
29 #include "llvm/Object/MachOUniversal.h"
30 #include "llvm/Object/ObjectFile.h"
31 #include "llvm/Object/WindowsResource.h"
32 #include "llvm/Support/Casting.h"
33 #include "llvm/Support/CommandLine.h"
34 #include "llvm/Support/DataTypes.h"
35 #include "llvm/Support/Debug.h"
36 #include "llvm/Support/FileSystem.h"
37 #include "llvm/Support/FormatVariadic.h"
38 #include "llvm/Support/InitLLVM.h"
39 #include "llvm/Support/Path.h"
40 #include "llvm/Support/ScopedPrinter.h"
41 #include "llvm/Support/TargetRegistry.h"
42 
43 using namespace llvm;
44 using namespace llvm::object;
45 
46 namespace opts {
47   cl::list<std::string> InputFilenames(cl::Positional,
48     cl::desc("<input object files>"),
49     cl::ZeroOrMore);
50 
51   // -wide, -W
52   cl::opt<bool> WideOutput("wide",
53     cl::desc("Ignored for compatibility with GNU readelf"));
54   cl::alias WideOutputShort("W",
55     cl::desc("Alias for --wide"),
56     cl::aliasopt(WideOutput));
57 
58   // -file-headers, -h
59   cl::opt<bool> FileHeaders("file-headers",
60     cl::desc("Display file headers "));
61   cl::alias FileHeadersShort("h",
62     cl::desc("Alias for --file-headers"),
63     cl::aliasopt(FileHeaders));
64 
65   // -sections, -s, -S
66   // Note: In GNU readelf, -s means --symbols!
67   cl::opt<bool> Sections("sections",
68     cl::desc("Display all sections."));
69   cl::alias SectionsShort("s",
70     cl::desc("Alias for --sections"),
71     cl::aliasopt(Sections));
72   cl::alias SectionsShortUpper("S",
73     cl::desc("Alias for --sections"),
74     cl::aliasopt(Sections));
75 
76   // -section-relocations, -sr
77   cl::opt<bool> SectionRelocations("section-relocations",
78     cl::desc("Display relocations for each section shown."));
79   cl::alias SectionRelocationsShort("sr",
80     cl::desc("Alias for --section-relocations"),
81     cl::aliasopt(SectionRelocations));
82 
83   // -section-symbols, -st
84   cl::opt<bool> SectionSymbols("section-symbols",
85     cl::desc("Display symbols for each section shown."));
86   cl::alias SectionSymbolsShort("st",
87     cl::desc("Alias for --section-symbols"),
88     cl::aliasopt(SectionSymbols));
89 
90   // -section-data, -sd
91   cl::opt<bool> SectionData("section-data",
92     cl::desc("Display section data for each section shown."));
93   cl::alias SectionDataShort("sd",
94     cl::desc("Alias for --section-data"),
95     cl::aliasopt(SectionData));
96 
97   // -relocations, -r
98   cl::opt<bool> Relocations("relocations",
99     cl::desc("Display the relocation entries in the file"));
100   cl::alias RelocationsShort("r",
101     cl::desc("Alias for --relocations"),
102     cl::aliasopt(Relocations));
103 
104   // -notes, -n
105   cl::opt<bool> Notes("notes", cl::desc("Display the ELF notes in the file"));
106   cl::alias NotesShort("n", cl::desc("Alias for --notes"), cl::aliasopt(Notes));
107 
108   // -dyn-relocations
109   cl::opt<bool> DynRelocs("dyn-relocations",
110     cl::desc("Display the dynamic relocation entries in the file"));
111 
112   // -symbols, -t
113   cl::opt<bool> Symbols("symbols",
114     cl::desc("Display the symbol table"));
115   cl::alias SymbolsShort("t",
116     cl::desc("Alias for --symbols"),
117     cl::aliasopt(Symbols));
118 
119   // -dyn-symbols, -dt
120   cl::opt<bool> DynamicSymbols("dyn-symbols",
121     cl::desc("Display the dynamic symbol table"));
122   cl::alias DynamicSymbolsShort("dt",
123     cl::desc("Alias for --dyn-symbols"),
124     cl::aliasopt(DynamicSymbols));
125 
126   // -unwind, -u
127   cl::opt<bool> UnwindInfo("unwind",
128     cl::desc("Display unwind information"));
129   cl::alias UnwindInfoShort("u",
130     cl::desc("Alias for --unwind"),
131     cl::aliasopt(UnwindInfo));
132 
133   // -dynamic-table
134   cl::opt<bool> DynamicTable("dynamic-table",
135     cl::desc("Display the ELF .dynamic section table"));
136   cl::alias DynamicTableShort("d", cl::desc("Alias for --dynamic-table"),
137                               cl::aliasopt(DynamicTable));
138 
139   // -needed-libs
140   cl::opt<bool> NeededLibraries("needed-libs",
141     cl::desc("Display the needed libraries"));
142 
143   // -program-headers
144   cl::opt<bool> ProgramHeaders("program-headers",
145     cl::desc("Display ELF program headers"));
146   cl::alias ProgramHeadersShort("l", cl::desc("Alias for --program-headers"),
147                                 cl::aliasopt(ProgramHeaders));
148 
149   // -hash-table
150   cl::opt<bool> HashTable("hash-table",
151     cl::desc("Display ELF hash table"));
152 
153   // -gnu-hash-table
154   cl::opt<bool> GnuHashTable("gnu-hash-table",
155     cl::desc("Display ELF .gnu.hash section"));
156 
157   // -expand-relocs
158   cl::opt<bool> ExpandRelocs("expand-relocs",
159     cl::desc("Expand each shown relocation to multiple lines"));
160 
161   // -codeview
162   cl::opt<bool> CodeView("codeview",
163                          cl::desc("Display CodeView debug information"));
164 
165   // -codeview-merged-types
166   cl::opt<bool>
167       CodeViewMergedTypes("codeview-merged-types",
168                           cl::desc("Display the merged CodeView type stream"));
169 
170   // -codeview-subsection-bytes
171   cl::opt<bool> CodeViewSubsectionBytes(
172       "codeview-subsection-bytes",
173       cl::desc("Dump raw contents of codeview debug sections and records"));
174 
175   // -arm-attributes, -a
176   cl::opt<bool> ARMAttributes("arm-attributes",
177                               cl::desc("Display the ARM attributes section"));
178   cl::alias ARMAttributesShort("a", cl::desc("Alias for --arm-attributes"),
179                                cl::aliasopt(ARMAttributes));
180 
181   // -mips-plt-got
182   cl::opt<bool>
183   MipsPLTGOT("mips-plt-got",
184              cl::desc("Display the MIPS GOT and PLT GOT sections"));
185 
186   // -mips-abi-flags
187   cl::opt<bool> MipsABIFlags("mips-abi-flags",
188                              cl::desc("Display the MIPS.abiflags section"));
189 
190   // -mips-reginfo
191   cl::opt<bool> MipsReginfo("mips-reginfo",
192                             cl::desc("Display the MIPS .reginfo section"));
193 
194   // -mips-options
195   cl::opt<bool> MipsOptions("mips-options",
196                             cl::desc("Display the MIPS .MIPS.options section"));
197 
198   // -coff-imports
199   cl::opt<bool>
200   COFFImports("coff-imports", cl::desc("Display the PE/COFF import table"));
201 
202   // -coff-exports
203   cl::opt<bool>
204   COFFExports("coff-exports", cl::desc("Display the PE/COFF export table"));
205 
206   // -coff-directives
207   cl::opt<bool>
208   COFFDirectives("coff-directives",
209                  cl::desc("Display the PE/COFF .drectve section"));
210 
211   // -coff-basereloc
212   cl::opt<bool>
213   COFFBaseRelocs("coff-basereloc",
214                  cl::desc("Display the PE/COFF .reloc section"));
215 
216   // -coff-debug-directory
217   cl::opt<bool>
218   COFFDebugDirectory("coff-debug-directory",
219                      cl::desc("Display the PE/COFF debug directory"));
220 
221   // -coff-resources
222   cl::opt<bool> COFFResources("coff-resources",
223                               cl::desc("Display the PE/COFF .rsrc section"));
224 
225   // -coff-load-config
226   cl::opt<bool>
227   COFFLoadConfig("coff-load-config",
228                  cl::desc("Display the PE/COFF load config"));
229 
230   // -elf-linker-options
231   cl::opt<bool>
232   ELFLinkerOptions("elf-linker-options",
233                    cl::desc("Display the ELF .linker-options section"));
234 
235   // -macho-data-in-code
236   cl::opt<bool>
237   MachODataInCode("macho-data-in-code",
238                   cl::desc("Display MachO Data in Code command"));
239 
240   // -macho-indirect-symbols
241   cl::opt<bool>
242   MachOIndirectSymbols("macho-indirect-symbols",
243                   cl::desc("Display MachO indirect symbols"));
244 
245   // -macho-linker-options
246   cl::opt<bool>
247   MachOLinkerOptions("macho-linker-options",
248                   cl::desc("Display MachO linker options"));
249 
250   // -macho-segment
251   cl::opt<bool>
252   MachOSegment("macho-segment",
253                   cl::desc("Display MachO Segment command"));
254 
255   // -macho-version-min
256   cl::opt<bool>
257   MachOVersionMin("macho-version-min",
258                   cl::desc("Display MachO version min command"));
259 
260   // -macho-dysymtab
261   cl::opt<bool>
262   MachODysymtab("macho-dysymtab",
263                   cl::desc("Display MachO Dysymtab command"));
264 
265   // -stackmap
266   cl::opt<bool>
267   PrintStackMap("stackmap",
268                 cl::desc("Display contents of stackmap section"));
269 
270   // -version-info
271   cl::opt<bool>
272       VersionInfo("version-info",
273                   cl::desc("Display ELF version sections (if present)"));
274   cl::alias VersionInfoShort("V", cl::desc("Alias for -version-info"),
275                              cl::aliasopt(VersionInfo));
276 
277   cl::opt<bool> SectionGroups("elf-section-groups",
278                               cl::desc("Display ELF section group contents"));
279   cl::alias SectionGroupsShort("g", cl::desc("Alias for -elf-sections-groups"),
280                                cl::aliasopt(SectionGroups));
281   cl::opt<bool> HashHistogram(
282       "elf-hash-histogram",
283       cl::desc("Display bucket list histogram for hash sections"));
284   cl::alias HashHistogramShort("I", cl::desc("Alias for -elf-hash-histogram"),
285                                cl::aliasopt(HashHistogram));
286 
287   cl::opt<OutputStyleTy>
288       Output("elf-output-style", cl::desc("Specify ELF dump style"),
289              cl::values(clEnumVal(LLVM, "LLVM default style"),
290                         clEnumVal(GNU, "GNU readelf style")),
291              cl::init(LLVM));
292 } // namespace opts
293 
294 namespace llvm {
295 
296 LLVM_ATTRIBUTE_NORETURN void reportError(Twine Msg) {
297   errs() << "\nError reading file: " << Msg << ".\n";
298   errs().flush();
299   exit(1);
300 }
301 
302 void error(Error EC) {
303   if (!EC)
304     return;
305   handleAllErrors(std::move(EC),
306                   [&](const ErrorInfoBase &EI) { reportError(EI.message()); });
307 }
308 
309 void error(std::error_code EC) {
310   if (!EC)
311     return;
312   reportError(EC.message());
313 }
314 
315 bool relocAddressLess(RelocationRef a, RelocationRef b) {
316   return a.getOffset() < b.getOffset();
317 }
318 
319 } // namespace llvm
320 
321 static void reportError(StringRef Input, std::error_code EC) {
322   if (Input == "-")
323     Input = "<stdin>";
324 
325   reportError(Twine(Input) + ": " + EC.message());
326 }
327 
328 static void reportError(StringRef Input, Error Err) {
329   if (Input == "-")
330     Input = "<stdin>";
331   std::string ErrMsg;
332   {
333     raw_string_ostream ErrStream(ErrMsg);
334     logAllUnhandledErrors(std::move(Err), ErrStream, Input + ": ");
335   }
336   reportError(ErrMsg);
337 }
338 
339 static bool isMipsArch(unsigned Arch) {
340   switch (Arch) {
341   case llvm::Triple::mips:
342   case llvm::Triple::mipsel:
343   case llvm::Triple::mips64:
344   case llvm::Triple::mips64el:
345     return true;
346   default:
347     return false;
348   }
349 }
350 namespace {
351 struct ReadObjTypeTableBuilder {
352   ReadObjTypeTableBuilder()
353       : Allocator(), IDTable(Allocator), TypeTable(Allocator) {}
354 
355   llvm::BumpPtrAllocator Allocator;
356   llvm::codeview::MergingTypeTableBuilder IDTable;
357   llvm::codeview::MergingTypeTableBuilder TypeTable;
358 };
359 }
360 static ReadObjTypeTableBuilder CVTypes;
361 
362 /// Creates an format-specific object file dumper.
363 static std::error_code createDumper(const ObjectFile *Obj,
364                                     ScopedPrinter &Writer,
365                                     std::unique_ptr<ObjDumper> &Result) {
366   if (!Obj)
367     return readobj_error::unsupported_file_format;
368 
369   if (Obj->isCOFF())
370     return createCOFFDumper(Obj, Writer, Result);
371   if (Obj->isELF())
372     return createELFDumper(Obj, Writer, Result);
373   if (Obj->isMachO())
374     return createMachODumper(Obj, Writer, Result);
375   if (Obj->isWasm())
376     return createWasmDumper(Obj, Writer, Result);
377 
378   return readobj_error::unsupported_obj_file_format;
379 }
380 
381 /// Dumps the specified object file.
382 static void dumpObject(const ObjectFile *Obj, ScopedPrinter &Writer) {
383   std::unique_ptr<ObjDumper> Dumper;
384   if (std::error_code EC = createDumper(Obj, Writer, Dumper))
385     reportError(Obj->getFileName(), EC);
386 
387   if (opts::Output == opts::LLVM) {
388     Writer.startLine() << "\n";
389     Writer.printString("File", Obj->getFileName());
390     Writer.printString("Format", Obj->getFileFormatName());
391     Writer.printString("Arch", Triple::getArchTypeName(
392                                    (llvm::Triple::ArchType)Obj->getArch()));
393     Writer.printString("AddressSize",
394                        formatv("{0}bit", 8 * Obj->getBytesInAddress()));
395     Dumper->printLoadName();
396   }
397 
398   if (opts::FileHeaders)
399     Dumper->printFileHeaders();
400   if (opts::Sections)
401     Dumper->printSections();
402   if (opts::Relocations)
403     Dumper->printRelocations();
404   if (opts::DynRelocs)
405     Dumper->printDynamicRelocations();
406   if (opts::Symbols)
407     Dumper->printSymbols();
408   if (opts::DynamicSymbols)
409     Dumper->printDynamicSymbols();
410   if (opts::UnwindInfo)
411     Dumper->printUnwindInfo();
412   if (opts::DynamicTable)
413     Dumper->printDynamicTable();
414   if (opts::NeededLibraries)
415     Dumper->printNeededLibraries();
416   if (opts::ProgramHeaders)
417     Dumper->printProgramHeaders();
418   if (opts::HashTable)
419     Dumper->printHashTable();
420   if (opts::GnuHashTable)
421     Dumper->printGnuHashTable();
422   if (opts::VersionInfo)
423     Dumper->printVersionInfo();
424   if (Obj->isELF()) {
425     if (opts::ELFLinkerOptions)
426       Dumper->printELFLinkerOptions();
427     if (Obj->getArch() == llvm::Triple::arm)
428       if (opts::ARMAttributes)
429         Dumper->printAttributes();
430     if (isMipsArch(Obj->getArch())) {
431       if (opts::MipsPLTGOT)
432         Dumper->printMipsPLTGOT();
433       if (opts::MipsABIFlags)
434         Dumper->printMipsABIFlags();
435       if (opts::MipsReginfo)
436         Dumper->printMipsReginfo();
437       if (opts::MipsOptions)
438         Dumper->printMipsOptions();
439     }
440     if (opts::SectionGroups)
441       Dumper->printGroupSections();
442     if (opts::HashHistogram)
443       Dumper->printHashHistogram();
444     if (opts::Notes)
445       Dumper->printNotes();
446   }
447   if (Obj->isCOFF()) {
448     if (opts::COFFImports)
449       Dumper->printCOFFImports();
450     if (opts::COFFExports)
451       Dumper->printCOFFExports();
452     if (opts::COFFDirectives)
453       Dumper->printCOFFDirectives();
454     if (opts::COFFBaseRelocs)
455       Dumper->printCOFFBaseReloc();
456     if (opts::COFFDebugDirectory)
457       Dumper->printCOFFDebugDirectory();
458     if (opts::COFFResources)
459       Dumper->printCOFFResources();
460     if (opts::COFFLoadConfig)
461       Dumper->printCOFFLoadConfig();
462     if (opts::CodeView)
463       Dumper->printCodeViewDebugInfo();
464     if (opts::CodeViewMergedTypes)
465       Dumper->mergeCodeViewTypes(CVTypes.IDTable, CVTypes.TypeTable);
466   }
467   if (Obj->isMachO()) {
468     if (opts::MachODataInCode)
469       Dumper->printMachODataInCode();
470     if (opts::MachOIndirectSymbols)
471       Dumper->printMachOIndirectSymbols();
472     if (opts::MachOLinkerOptions)
473       Dumper->printMachOLinkerOptions();
474     if (opts::MachOSegment)
475       Dumper->printMachOSegment();
476     if (opts::MachOVersionMin)
477       Dumper->printMachOVersionMin();
478     if (opts::MachODysymtab)
479       Dumper->printMachODysymtab();
480   }
481   if (opts::PrintStackMap)
482     Dumper->printStackMap();
483 }
484 
485 /// Dumps each object file in \a Arc;
486 static void dumpArchive(const Archive *Arc, ScopedPrinter &Writer) {
487   Error Err = Error::success();
488   for (auto &Child : Arc->children(Err)) {
489     Expected<std::unique_ptr<Binary>> ChildOrErr = Child.getAsBinary();
490     if (!ChildOrErr) {
491       if (auto E = isNotObjectErrorInvalidFileType(ChildOrErr.takeError())) {
492         reportError(Arc->getFileName(), ChildOrErr.takeError());
493       }
494       continue;
495     }
496     if (ObjectFile *Obj = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
497       dumpObject(Obj, Writer);
498     else if (COFFImportFile *Imp = dyn_cast<COFFImportFile>(&*ChildOrErr.get()))
499       dumpCOFFImportFile(Imp, Writer);
500     else
501       reportError(Arc->getFileName(), readobj_error::unrecognized_file_format);
502   }
503   if (Err)
504     reportError(Arc->getFileName(), std::move(Err));
505 }
506 
507 /// Dumps each object file in \a MachO Universal Binary;
508 static void dumpMachOUniversalBinary(const MachOUniversalBinary *UBinary,
509                                      ScopedPrinter &Writer) {
510   for (const MachOUniversalBinary::ObjectForArch &Obj : UBinary->objects()) {
511     Expected<std::unique_ptr<MachOObjectFile>> ObjOrErr = Obj.getAsObjectFile();
512     if (ObjOrErr)
513       dumpObject(&*ObjOrErr.get(), Writer);
514     else if (auto E = isNotObjectErrorInvalidFileType(ObjOrErr.takeError())) {
515       reportError(UBinary->getFileName(), ObjOrErr.takeError());
516     }
517     else if (Expected<std::unique_ptr<Archive>> AOrErr = Obj.getAsArchive())
518       dumpArchive(&*AOrErr.get(), Writer);
519   }
520 }
521 
522 /// Dumps \a WinRes, Windows Resource (.res) file;
523 static void dumpWindowsResourceFile(WindowsResource *WinRes) {
524   ScopedPrinter Printer{outs()};
525   WindowsRes::Dumper Dumper(WinRes, Printer);
526   if (auto Err = Dumper.printData())
527     reportError(WinRes->getFileName(), std::move(Err));
528 }
529 
530 
531 /// Opens \a File and dumps it.
532 static void dumpInput(StringRef File) {
533   ScopedPrinter Writer(outs());
534 
535   // Attempt to open the binary.
536   Expected<OwningBinary<Binary>> BinaryOrErr = createBinary(File);
537   if (!BinaryOrErr)
538     reportError(File, BinaryOrErr.takeError());
539   Binary &Binary = *BinaryOrErr.get().getBinary();
540 
541   if (Archive *Arc = dyn_cast<Archive>(&Binary))
542     dumpArchive(Arc, Writer);
543   else if (MachOUniversalBinary *UBinary =
544                dyn_cast<MachOUniversalBinary>(&Binary))
545     dumpMachOUniversalBinary(UBinary, Writer);
546   else if (ObjectFile *Obj = dyn_cast<ObjectFile>(&Binary))
547     dumpObject(Obj, Writer);
548   else if (COFFImportFile *Import = dyn_cast<COFFImportFile>(&Binary))
549     dumpCOFFImportFile(Import, Writer);
550   else if (WindowsResource *WinRes = dyn_cast<WindowsResource>(&Binary))
551     dumpWindowsResourceFile(WinRes);
552   else
553     reportError(File, readobj_error::unrecognized_file_format);
554 }
555 
556 int main(int argc, const char *argv[]) {
557   InitLLVM X(argc, argv);
558 
559   // Register the target printer for --version.
560   cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
561 
562   opts::WideOutput.setHiddenFlag(cl::Hidden);
563 
564   if (sys::path::stem(argv[0]).find("readelf") != StringRef::npos)
565     opts::Output = opts::GNU;
566 
567   cl::ParseCommandLineOptions(argc, argv, "LLVM Object Reader\n");
568 
569   // Default to stdin if no filename is specified.
570   if (opts::InputFilenames.size() == 0)
571     opts::InputFilenames.push_back("-");
572 
573   llvm::for_each(opts::InputFilenames, dumpInput);
574 
575   if (opts::CodeViewMergedTypes) {
576     ScopedPrinter W(outs());
577     dumpCodeViewMergedTypes(W, CVTypes.IDTable, CVTypes.TypeTable);
578   }
579 
580   return 0;
581 }
582