1 //===- llvm-readobj.cpp - Dump contents of an Object File -----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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
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.
18 // Output should be specialized for each format where appropriate.
20 //===----------------------------------------------------------------------===//
22 #include "llvm-readobj.h"
24 #include "ObjDumper.h"
25 #include "WindowsResourceDumper.h"
26 #include "llvm/DebugInfo/CodeView/TypeTableBuilder.h"
27 #include "llvm/Object/Archive.h"
28 #include "llvm/Object/COFFImportFile.h"
29 #include "llvm/Object/ELFObjectFile.h"
30 #include "llvm/Object/MachOUniversal.h"
31 #include "llvm/Object/ObjectFile.h"
32 #include "llvm/Object/WindowsResource.h"
33 #include "llvm/Support/Casting.h"
34 #include "llvm/Support/CommandLine.h"
35 #include "llvm/Support/DataTypes.h"
36 #include "llvm/Support/Debug.h"
37 #include "llvm/Support/FileSystem.h"
38 #include "llvm/Support/ManagedStatic.h"
39 #include "llvm/Support/Path.h"
40 #include "llvm/Support/PrettyStackTrace.h"
41 #include "llvm/Support/ScopedPrinter.h"
42 #include "llvm/Support/Signals.h"
43 #include "llvm/Support/TargetRegistry.h"
44 #include "llvm/Support/TargetSelect.h"
46 #include <system_error>
49 using namespace llvm::object;
52 cl::list<std::string> InputFilenames(cl::Positional,
53 cl::desc("<input object files>"),
57 cl::opt<bool> WideOutput("wide",
58 cl::desc("Ignored for compatibility with GNU readelf"));
59 cl::alias WideOutputShort("W",
60 cl::desc("Alias for --wide"),
61 cl::aliasopt(WideOutput));
64 cl::opt<bool> FileHeaders("file-headers",
65 cl::desc("Display file headers "));
66 cl::alias FileHeadersShort("h",
67 cl::desc("Alias for --file-headers"),
68 cl::aliasopt(FileHeaders));
71 // Note: In GNU readelf, -s means --symbols!
72 cl::opt<bool> Sections("sections",
73 cl::desc("Display all sections."));
74 cl::alias SectionsShort("s",
75 cl::desc("Alias for --sections"),
76 cl::aliasopt(Sections));
77 cl::alias SectionsShortUpper("S",
78 cl::desc("Alias for --sections"),
79 cl::aliasopt(Sections));
81 // -section-relocations, -sr
82 cl::opt<bool> SectionRelocations("section-relocations",
83 cl::desc("Display relocations for each section shown."));
84 cl::alias SectionRelocationsShort("sr",
85 cl::desc("Alias for --section-relocations"),
86 cl::aliasopt(SectionRelocations));
88 // -section-symbols, -st
89 cl::opt<bool> SectionSymbols("section-symbols",
90 cl::desc("Display symbols for each section shown."));
91 cl::alias SectionSymbolsShort("st",
92 cl::desc("Alias for --section-symbols"),
93 cl::aliasopt(SectionSymbols));
96 cl::opt<bool> SectionData("section-data",
97 cl::desc("Display section data for each section shown."));
98 cl::alias SectionDataShort("sd",
99 cl::desc("Alias for --section-data"),
100 cl::aliasopt(SectionData));
103 cl::opt<bool> Relocations("relocations",
104 cl::desc("Display the relocation entries in the file"));
105 cl::alias RelocationsShort("r",
106 cl::desc("Alias for --relocations"),
107 cl::aliasopt(Relocations));
110 cl::opt<bool> Notes("notes", cl::desc("Display the ELF notes in the file"));
111 cl::alias NotesShort("n", cl::desc("Alias for --notes"), cl::aliasopt(Notes));
114 cl::opt<bool> DynRelocs("dyn-relocations",
115 cl::desc("Display the dynamic relocation entries in the file"));
118 cl::opt<bool> Symbols("symbols",
119 cl::desc("Display the symbol table"));
120 cl::alias SymbolsShort("t",
121 cl::desc("Alias for --symbols"),
122 cl::aliasopt(Symbols));
125 cl::opt<bool> DynamicSymbols("dyn-symbols",
126 cl::desc("Display the dynamic symbol table"));
127 cl::alias DynamicSymbolsShort("dt",
128 cl::desc("Alias for --dyn-symbols"),
129 cl::aliasopt(DynamicSymbols));
132 cl::opt<bool> UnwindInfo("unwind",
133 cl::desc("Display unwind information"));
134 cl::alias UnwindInfoShort("u",
135 cl::desc("Alias for --unwind"),
136 cl::aliasopt(UnwindInfo));
139 cl::opt<bool> DynamicTable("dynamic-table",
140 cl::desc("Display the ELF .dynamic section table"));
141 cl::alias DynamicTableShort("d", cl::desc("Alias for --dynamic-table"),
142 cl::aliasopt(DynamicTable));
145 cl::opt<bool> NeededLibraries("needed-libs",
146 cl::desc("Display the needed libraries"));
149 cl::opt<bool> ProgramHeaders("program-headers",
150 cl::desc("Display ELF program headers"));
151 cl::alias ProgramHeadersShort("l", cl::desc("Alias for --program-headers"),
152 cl::aliasopt(ProgramHeaders));
155 cl::opt<bool> HashTable("hash-table",
156 cl::desc("Display ELF hash table"));
159 cl::opt<bool> GnuHashTable("gnu-hash-table",
160 cl::desc("Display ELF .gnu.hash section"));
163 cl::opt<bool> ExpandRelocs("expand-relocs",
164 cl::desc("Expand each shown relocation to multiple lines"));
167 cl::opt<bool> CodeView("codeview",
168 cl::desc("Display CodeView debug information"));
170 // -codeview-merged-types
172 CodeViewMergedTypes("codeview-merged-types",
173 cl::desc("Display the merged CodeView type stream"));
175 // -codeview-subsection-bytes
176 cl::opt<bool> CodeViewSubsectionBytes(
177 "codeview-subsection-bytes",
178 cl::desc("Dump raw contents of codeview debug sections and records"));
180 // -arm-attributes, -a
181 cl::opt<bool> ARMAttributes("arm-attributes",
182 cl::desc("Display the ARM attributes section"));
183 cl::alias ARMAttributesShort("a", cl::desc("Alias for --arm-attributes"),
184 cl::aliasopt(ARMAttributes));
188 MipsPLTGOT("mips-plt-got",
189 cl::desc("Display the MIPS GOT and PLT GOT sections"));
192 cl::opt<bool> MipsABIFlags("mips-abi-flags",
193 cl::desc("Display the MIPS.abiflags section"));
196 cl::opt<bool> MipsReginfo("mips-reginfo",
197 cl::desc("Display the MIPS .reginfo section"));
200 cl::opt<bool> MipsOptions("mips-options",
201 cl::desc("Display the MIPS .MIPS.options section"));
205 COFFImports("coff-imports", cl::desc("Display the PE/COFF import table"));
209 COFFExports("coff-exports", cl::desc("Display the PE/COFF export table"));
213 COFFDirectives("coff-directives",
214 cl::desc("Display the PE/COFF .drectve section"));
218 COFFBaseRelocs("coff-basereloc",
219 cl::desc("Display the PE/COFF .reloc section"));
221 // -coff-debug-directory
223 COFFDebugDirectory("coff-debug-directory",
224 cl::desc("Display the PE/COFF debug directory"));
227 cl::opt<bool> COFFResources("coff-resources",
228 cl::desc("Display the PE/COFF .rsrc section"));
232 COFFLoadConfig("coff-load-config",
233 cl::desc("Display the PE/COFF load config"));
235 // -macho-data-in-code
237 MachODataInCode("macho-data-in-code",
238 cl::desc("Display MachO Data in Code command"));
240 // -macho-indirect-symbols
242 MachOIndirectSymbols("macho-indirect-symbols",
243 cl::desc("Display MachO indirect symbols"));
245 // -macho-linker-options
247 MachOLinkerOptions("macho-linker-options",
248 cl::desc("Display MachO linker options"));
252 MachOSegment("macho-segment",
253 cl::desc("Display MachO Segment command"));
255 // -macho-version-min
257 MachOVersionMin("macho-version-min",
258 cl::desc("Display MachO version min command"));
262 MachODysymtab("macho-dysymtab",
263 cl::desc("Display MachO Dysymtab command"));
267 PrintStackMap("stackmap",
268 cl::desc("Display contents of stackmap section"));
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));
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));
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")),
296 LLVM_ATTRIBUTE_NORETURN void reportError(Twine Msg) {
297 errs() << "\nError reading file: " << Msg << ".\n";
302 void error(Error EC) {
305 handleAllErrors(std::move(EC),
306 [&](const ErrorInfoBase &EI) { reportError(EI.message()); });
309 void error(std::error_code EC) {
312 reportError(EC.message());
315 bool relocAddressLess(RelocationRef a, RelocationRef b) {
316 return a.getOffset() < b.getOffset();
321 static void reportError(StringRef Input, std::error_code EC) {
325 reportError(Twine(Input) + ": " + EC.message());
328 static void reportError(StringRef Input, Error Err) {
333 raw_string_ostream ErrStream(ErrMsg);
334 logAllUnhandledErrors(std::move(Err), ErrStream, Input + ": ");
339 static bool isMipsArch(unsigned Arch) {
341 case llvm::Triple::mips:
342 case llvm::Triple::mipsel:
343 case llvm::Triple::mips64:
344 case llvm::Triple::mips64el:
351 struct ReadObjTypeTableBuilder {
352 ReadObjTypeTableBuilder()
353 : Allocator(), IDTable(Allocator), TypeTable(Allocator) {}
355 llvm::BumpPtrAllocator Allocator;
356 llvm::codeview::TypeTableBuilder IDTable;
357 llvm::codeview::TypeTableBuilder TypeTable;
360 static ReadObjTypeTableBuilder CVTypes;
362 /// @brief 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) {
367 return readobj_error::unsupported_file_format;
370 return createCOFFDumper(Obj, Writer, Result);
372 return createELFDumper(Obj, Writer, Result);
374 return createMachODumper(Obj, Writer, Result);
376 return createWasmDumper(Obj, Writer, Result);
378 return readobj_error::unsupported_obj_file_format;
381 /// @brief Dumps the specified object file.
382 static void dumpObject(const ObjectFile *Obj) {
383 ScopedPrinter Writer(outs());
384 std::unique_ptr<ObjDumper> Dumper;
385 if (std::error_code EC = createDumper(Obj, Writer, Dumper))
386 reportError(Obj->getFileName(), EC);
388 if (opts::Output == opts::LLVM) {
390 outs() << "File: " << Obj->getFileName() << "\n";
391 outs() << "Format: " << Obj->getFileFormatName() << "\n";
392 outs() << "Arch: " << Triple::getArchTypeName(
393 (llvm::Triple::ArchType)Obj->getArch()) << "\n";
394 outs() << "AddressSize: " << (8 * Obj->getBytesInAddress()) << "bit\n";
395 Dumper->printLoadName();
398 if (opts::FileHeaders)
399 Dumper->printFileHeaders();
401 Dumper->printSections();
402 if (opts::Relocations)
403 Dumper->printRelocations();
405 Dumper->printDynamicRelocations();
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();
419 Dumper->printHashTable();
420 if (opts::GnuHashTable)
421 Dumper->printGnuHashTable();
422 if (opts::VersionInfo)
423 Dumper->printVersionInfo();
425 if (Obj->getArch() == llvm::Triple::arm)
426 if (opts::ARMAttributes)
427 Dumper->printAttributes();
428 if (isMipsArch(Obj->getArch())) {
429 if (opts::MipsPLTGOT)
430 Dumper->printMipsPLTGOT();
431 if (opts::MipsABIFlags)
432 Dumper->printMipsABIFlags();
433 if (opts::MipsReginfo)
434 Dumper->printMipsReginfo();
435 if (opts::MipsOptions)
436 Dumper->printMipsOptions();
438 if (opts::SectionGroups)
439 Dumper->printGroupSections();
440 if (opts::HashHistogram)
441 Dumper->printHashHistogram();
443 Dumper->printNotes();
446 if (opts::COFFImports)
447 Dumper->printCOFFImports();
448 if (opts::COFFExports)
449 Dumper->printCOFFExports();
450 if (opts::COFFDirectives)
451 Dumper->printCOFFDirectives();
452 if (opts::COFFBaseRelocs)
453 Dumper->printCOFFBaseReloc();
454 if (opts::COFFDebugDirectory)
455 Dumper->printCOFFDebugDirectory();
456 if (opts::COFFResources)
457 Dumper->printCOFFResources();
458 if (opts::COFFLoadConfig)
459 Dumper->printCOFFLoadConfig();
461 Dumper->printCodeViewDebugInfo();
462 if (opts::CodeViewMergedTypes)
463 Dumper->mergeCodeViewTypes(CVTypes.IDTable, CVTypes.TypeTable);
465 if (Obj->isMachO()) {
466 if (opts::MachODataInCode)
467 Dumper->printMachODataInCode();
468 if (opts::MachOIndirectSymbols)
469 Dumper->printMachOIndirectSymbols();
470 if (opts::MachOLinkerOptions)
471 Dumper->printMachOLinkerOptions();
472 if (opts::MachOSegment)
473 Dumper->printMachOSegment();
474 if (opts::MachOVersionMin)
475 Dumper->printMachOVersionMin();
476 if (opts::MachODysymtab)
477 Dumper->printMachODysymtab();
479 if (opts::PrintStackMap)
480 Dumper->printStackMap();
483 /// @brief Dumps each object file in \a Arc;
484 static void dumpArchive(const Archive *Arc) {
485 Error Err = Error::success();
486 for (auto &Child : Arc->children(Err)) {
487 Expected<std::unique_ptr<Binary>> ChildOrErr = Child.getAsBinary();
489 if (auto E = isNotObjectErrorInvalidFileType(ChildOrErr.takeError())) {
490 reportError(Arc->getFileName(), ChildOrErr.takeError());
494 if (ObjectFile *Obj = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
496 else if (COFFImportFile *Imp = dyn_cast<COFFImportFile>(&*ChildOrErr.get()))
497 dumpCOFFImportFile(Imp);
499 reportError(Arc->getFileName(), readobj_error::unrecognized_file_format);
502 reportError(Arc->getFileName(), std::move(Err));
505 /// @brief Dumps each object file in \a MachO Universal Binary;
506 static void dumpMachOUniversalBinary(const MachOUniversalBinary *UBinary) {
507 for (const MachOUniversalBinary::ObjectForArch &Obj : UBinary->objects()) {
508 Expected<std::unique_ptr<MachOObjectFile>> ObjOrErr = Obj.getAsObjectFile();
510 dumpObject(&*ObjOrErr.get());
511 else if (auto E = isNotObjectErrorInvalidFileType(ObjOrErr.takeError())) {
512 reportError(UBinary->getFileName(), ObjOrErr.takeError());
514 else if (Expected<std::unique_ptr<Archive>> AOrErr = Obj.getAsArchive())
515 dumpArchive(&*AOrErr.get());
519 /// @brief Dumps \a WinRes, Windows Resource (.res) file;
520 static void dumpWindowsResourceFile(WindowsResource *WinRes) {
521 ScopedPrinter Printer{outs()};
522 WindowsRes::Dumper Dumper(WinRes, Printer);
523 if (auto Err = Dumper.printData())
524 reportError(WinRes->getFileName(), std::move(Err));
528 /// @brief Opens \a File and dumps it.
529 static void dumpInput(StringRef File) {
531 // Attempt to open the binary.
532 Expected<OwningBinary<Binary>> BinaryOrErr = createBinary(File);
534 reportError(File, BinaryOrErr.takeError());
535 Binary &Binary = *BinaryOrErr.get().getBinary();
537 if (Archive *Arc = dyn_cast<Archive>(&Binary))
539 else if (MachOUniversalBinary *UBinary =
540 dyn_cast<MachOUniversalBinary>(&Binary))
541 dumpMachOUniversalBinary(UBinary);
542 else if (ObjectFile *Obj = dyn_cast<ObjectFile>(&Binary))
544 else if (COFFImportFile *Import = dyn_cast<COFFImportFile>(&Binary))
545 dumpCOFFImportFile(Import);
546 else if (WindowsResource *WinRes = dyn_cast<WindowsResource>(&Binary))
547 dumpWindowsResourceFile(WinRes);
549 reportError(File, readobj_error::unrecognized_file_format);
552 int main(int argc, const char *argv[]) {
553 StringRef ToolName = argv[0];
554 sys::PrintStackTraceOnErrorSignal(ToolName);
555 PrettyStackTraceProgram X(argc, argv);
558 // Register the target printer for --version.
559 cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
561 opts::WideOutput.setHiddenFlag(cl::Hidden);
563 if (sys::path::stem(ToolName).find("readelf") != StringRef::npos)
564 opts::Output = opts::GNU;
566 cl::ParseCommandLineOptions(argc, argv, "LLVM Object Reader\n");
568 // Default to stdin if no filename is specified.
569 if (opts::InputFilenames.size() == 0)
570 opts::InputFilenames.push_back("-");
572 std::for_each(opts::InputFilenames.begin(), opts::InputFilenames.end(),
575 if (opts::CodeViewMergedTypes) {
576 ScopedPrinter W(outs());
577 dumpCodeViewMergedTypes(W, CVTypes.IDTable, CVTypes.TypeTable);