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 "llvm/DebugInfo/CodeView/TypeTableBuilder.h"
26 #include "llvm/Object/Archive.h"
27 #include "llvm/Object/COFFImportFile.h"
28 #include "llvm/Object/ELFObjectFile.h"
29 #include "llvm/Object/MachOUniversal.h"
30 #include "llvm/Object/ObjectFile.h"
31 #include "llvm/Support/Casting.h"
32 #include "llvm/Support/CommandLine.h"
33 #include "llvm/Support/DataTypes.h"
34 #include "llvm/Support/Debug.h"
35 #include "llvm/Support/FileSystem.h"
36 #include "llvm/Support/ManagedStatic.h"
37 #include "llvm/Support/Path.h"
38 #include "llvm/Support/PrettyStackTrace.h"
39 #include "llvm/Support/ScopedPrinter.h"
40 #include "llvm/Support/Signals.h"
41 #include "llvm/Support/TargetRegistry.h"
42 #include "llvm/Support/TargetSelect.h"
44 #include <system_error>
47 using namespace llvm::object;
50 cl::list<std::string> InputFilenames(cl::Positional,
51 cl::desc("<input object files>"),
55 cl::opt<bool> WideOutput("wide",
56 cl::desc("Ignored for compatibility with GNU readelf"));
57 cl::alias WideOutputShort("W",
58 cl::desc("Alias for --wide"),
59 cl::aliasopt(WideOutput));
62 cl::opt<bool> FileHeaders("file-headers",
63 cl::desc("Display file headers "));
64 cl::alias FileHeadersShort("h",
65 cl::desc("Alias for --file-headers"),
66 cl::aliasopt(FileHeaders));
69 // Note: In GNU readelf, -s means --symbols!
70 cl::opt<bool> Sections("sections",
71 cl::desc("Display all sections."));
72 cl::alias SectionsShort("s",
73 cl::desc("Alias for --sections"),
74 cl::aliasopt(Sections));
75 cl::alias SectionsShortUpper("S",
76 cl::desc("Alias for --sections"),
77 cl::aliasopt(Sections));
79 // -section-relocations, -sr
80 cl::opt<bool> SectionRelocations("section-relocations",
81 cl::desc("Display relocations for each section shown."));
82 cl::alias SectionRelocationsShort("sr",
83 cl::desc("Alias for --section-relocations"),
84 cl::aliasopt(SectionRelocations));
86 // -section-symbols, -st
87 cl::opt<bool> SectionSymbols("section-symbols",
88 cl::desc("Display symbols for each section shown."));
89 cl::alias SectionSymbolsShort("st",
90 cl::desc("Alias for --section-symbols"),
91 cl::aliasopt(SectionSymbols));
94 cl::opt<bool> SectionData("section-data",
95 cl::desc("Display section data for each section shown."));
96 cl::alias SectionDataShort("sd",
97 cl::desc("Alias for --section-data"),
98 cl::aliasopt(SectionData));
101 cl::opt<bool> Relocations("relocations",
102 cl::desc("Display the relocation entries in the file"));
103 cl::alias RelocationsShort("r",
104 cl::desc("Alias for --relocations"),
105 cl::aliasopt(Relocations));
108 cl::opt<bool> Notes("notes", cl::desc("Display the ELF notes in the file"));
109 cl::alias NotesShort("n", cl::desc("Alias for --notes"), cl::aliasopt(Notes));
112 cl::opt<bool> DynRelocs("dyn-relocations",
113 cl::desc("Display the dynamic relocation entries in the file"));
116 cl::opt<bool> Symbols("symbols",
117 cl::desc("Display the symbol table"));
118 cl::alias SymbolsShort("t",
119 cl::desc("Alias for --symbols"),
120 cl::aliasopt(Symbols));
123 cl::opt<bool> DynamicSymbols("dyn-symbols",
124 cl::desc("Display the dynamic symbol table"));
125 cl::alias DynamicSymbolsShort("dt",
126 cl::desc("Alias for --dyn-symbols"),
127 cl::aliasopt(DynamicSymbols));
130 cl::opt<bool> UnwindInfo("unwind",
131 cl::desc("Display unwind information"));
132 cl::alias UnwindInfoShort("u",
133 cl::desc("Alias for --unwind"),
134 cl::aliasopt(UnwindInfo));
137 cl::opt<bool> DynamicTable("dynamic-table",
138 cl::desc("Display the ELF .dynamic section table"));
139 cl::alias DynamicTableShort("d", cl::desc("Alias for --dynamic-table"),
140 cl::aliasopt(DynamicTable));
143 cl::opt<bool> NeededLibraries("needed-libs",
144 cl::desc("Display the needed libraries"));
147 cl::opt<bool> ProgramHeaders("program-headers",
148 cl::desc("Display ELF program headers"));
149 cl::alias ProgramHeadersShort("l", cl::desc("Alias for --program-headers"),
150 cl::aliasopt(ProgramHeaders));
153 cl::opt<bool> HashTable("hash-table",
154 cl::desc("Display ELF hash table"));
157 cl::opt<bool> GnuHashTable("gnu-hash-table",
158 cl::desc("Display ELF .gnu.hash section"));
161 cl::opt<bool> ExpandRelocs("expand-relocs",
162 cl::desc("Expand each shown relocation to multiple lines"));
165 cl::opt<bool> CodeView("codeview",
166 cl::desc("Display CodeView debug information"));
168 // -codeview-merged-types
170 CodeViewMergedTypes("codeview-merged-types",
171 cl::desc("Display the merged CodeView type stream"));
173 // -codeview-subsection-bytes
174 cl::opt<bool> CodeViewSubsectionBytes(
175 "codeview-subsection-bytes",
176 cl::desc("Dump raw contents of codeview debug sections and records"));
178 // -arm-attributes, -a
179 cl::opt<bool> ARMAttributes("arm-attributes",
180 cl::desc("Display the ARM attributes section"));
181 cl::alias ARMAttributesShort("a", cl::desc("Alias for --arm-attributes"),
182 cl::aliasopt(ARMAttributes));
186 MipsPLTGOT("mips-plt-got",
187 cl::desc("Display the MIPS GOT and PLT GOT sections"));
190 cl::opt<bool> MipsABIFlags("mips-abi-flags",
191 cl::desc("Display the MIPS.abiflags section"));
194 cl::opt<bool> MipsReginfo("mips-reginfo",
195 cl::desc("Display the MIPS .reginfo section"));
198 cl::opt<bool> MipsOptions("mips-options",
199 cl::desc("Display the MIPS .MIPS.options section"));
201 // -amdgpu-code-object-metadata
202 cl::opt<bool> AMDGPUCodeObjectMetadata(
203 "amdgpu-code-object-metadata",
204 cl::desc("Display AMDGPU code object metadata"));
208 COFFImports("coff-imports", cl::desc("Display the PE/COFF import table"));
212 COFFExports("coff-exports", cl::desc("Display the PE/COFF export table"));
216 COFFDirectives("coff-directives",
217 cl::desc("Display the PE/COFF .drectve section"));
221 COFFBaseRelocs("coff-basereloc",
222 cl::desc("Display the PE/COFF .reloc section"));
224 // -coff-debug-directory
226 COFFDebugDirectory("coff-debug-directory",
227 cl::desc("Display the PE/COFF debug directory"));
230 cl::opt<bool> COFFResources("coff-resources",
231 cl::desc("Display the PE/COFF .rsrc section"));
235 COFFLoadConfig("coff-load-config",
236 cl::desc("Display the PE/COFF load config"));
238 // -macho-data-in-code
240 MachODataInCode("macho-data-in-code",
241 cl::desc("Display MachO Data in Code command"));
243 // -macho-indirect-symbols
245 MachOIndirectSymbols("macho-indirect-symbols",
246 cl::desc("Display MachO indirect symbols"));
248 // -macho-linker-options
250 MachOLinkerOptions("macho-linker-options",
251 cl::desc("Display MachO linker options"));
255 MachOSegment("macho-segment",
256 cl::desc("Display MachO Segment command"));
258 // -macho-version-min
260 MachOVersionMin("macho-version-min",
261 cl::desc("Display MachO version min command"));
265 MachODysymtab("macho-dysymtab",
266 cl::desc("Display MachO Dysymtab command"));
270 PrintStackMap("stackmap",
271 cl::desc("Display contents of stackmap section"));
275 VersionInfo("version-info",
276 cl::desc("Display ELF version sections (if present)"));
277 cl::alias VersionInfoShort("V", cl::desc("Alias for -version-info"),
278 cl::aliasopt(VersionInfo));
280 cl::opt<bool> SectionGroups("elf-section-groups",
281 cl::desc("Display ELF section group contents"));
282 cl::alias SectionGroupsShort("g", cl::desc("Alias for -elf-sections-groups"),
283 cl::aliasopt(SectionGroups));
284 cl::opt<bool> HashHistogram(
285 "elf-hash-histogram",
286 cl::desc("Display bucket list histogram for hash sections"));
287 cl::alias HashHistogramShort("I", cl::desc("Alias for -elf-hash-histogram"),
288 cl::aliasopt(HashHistogram));
290 cl::opt<OutputStyleTy>
291 Output("elf-output-style", cl::desc("Specify ELF dump style"),
292 cl::values(clEnumVal(LLVM, "LLVM default style"),
293 clEnumVal(GNU, "GNU readelf style")),
299 LLVM_ATTRIBUTE_NORETURN void reportError(Twine Msg) {
300 errs() << "\nError reading file: " << Msg << ".\n";
305 void error(Error EC) {
308 handleAllErrors(std::move(EC),
309 [&](const ErrorInfoBase &EI) { reportError(EI.message()); });
312 void error(std::error_code EC) {
315 reportError(EC.message());
318 bool relocAddressLess(RelocationRef a, RelocationRef b) {
319 return a.getOffset() < b.getOffset();
324 static void reportError(StringRef Input, std::error_code EC) {
328 reportError(Twine(Input) + ": " + EC.message());
331 static void reportError(StringRef Input, Error Err) {
336 raw_string_ostream ErrStream(ErrMsg);
337 logAllUnhandledErrors(std::move(Err), ErrStream, Input + ": ");
342 static bool isMipsArch(unsigned Arch) {
344 case llvm::Triple::mips:
345 case llvm::Triple::mipsel:
346 case llvm::Triple::mips64:
347 case llvm::Triple::mips64el:
354 struct ReadObjTypeTableBuilder {
355 ReadObjTypeTableBuilder()
356 : Allocator(), IDTable(Allocator), TypeTable(Allocator) {}
358 llvm::BumpPtrAllocator Allocator;
359 llvm::codeview::TypeTableBuilder IDTable;
360 llvm::codeview::TypeTableBuilder TypeTable;
363 static ReadObjTypeTableBuilder CVTypes;
365 /// @brief Creates an format-specific object file dumper.
366 static std::error_code createDumper(const ObjectFile *Obj,
367 ScopedPrinter &Writer,
368 std::unique_ptr<ObjDumper> &Result) {
370 return readobj_error::unsupported_file_format;
373 return createCOFFDumper(Obj, Writer, Result);
375 return createELFDumper(Obj, Writer, Result);
377 return createMachODumper(Obj, Writer, Result);
379 return createWasmDumper(Obj, Writer, Result);
381 return readobj_error::unsupported_obj_file_format;
384 /// @brief Dumps the specified object file.
385 static void dumpObject(const ObjectFile *Obj) {
386 ScopedPrinter Writer(outs());
387 std::unique_ptr<ObjDumper> Dumper;
388 if (std::error_code EC = createDumper(Obj, Writer, Dumper))
389 reportError(Obj->getFileName(), EC);
391 if (opts::Output == opts::LLVM) {
393 outs() << "File: " << Obj->getFileName() << "\n";
394 outs() << "Format: " << Obj->getFileFormatName() << "\n";
395 outs() << "Arch: " << Triple::getArchTypeName(
396 (llvm::Triple::ArchType)Obj->getArch()) << "\n";
397 outs() << "AddressSize: " << (8 * Obj->getBytesInAddress()) << "bit\n";
398 Dumper->printLoadName();
401 if (opts::FileHeaders)
402 Dumper->printFileHeaders();
404 Dumper->printSections();
405 if (opts::Relocations)
406 Dumper->printRelocations();
408 Dumper->printDynamicRelocations();
410 Dumper->printSymbols();
411 if (opts::DynamicSymbols)
412 Dumper->printDynamicSymbols();
413 if (opts::UnwindInfo)
414 Dumper->printUnwindInfo();
415 if (opts::DynamicTable)
416 Dumper->printDynamicTable();
417 if (opts::NeededLibraries)
418 Dumper->printNeededLibraries();
419 if (opts::ProgramHeaders)
420 Dumper->printProgramHeaders();
422 Dumper->printHashTable();
423 if (opts::GnuHashTable)
424 Dumper->printGnuHashTable();
425 if (opts::VersionInfo)
426 Dumper->printVersionInfo();
428 if (Obj->getArch() == llvm::Triple::arm)
429 if (opts::ARMAttributes)
430 Dumper->printAttributes();
431 if (isMipsArch(Obj->getArch())) {
432 if (opts::MipsPLTGOT)
433 Dumper->printMipsPLTGOT();
434 if (opts::MipsABIFlags)
435 Dumper->printMipsABIFlags();
436 if (opts::MipsReginfo)
437 Dumper->printMipsReginfo();
438 if (opts::MipsOptions)
439 Dumper->printMipsOptions();
441 if (Obj->getArch() == llvm::Triple::amdgcn)
442 if (opts::AMDGPUCodeObjectMetadata)
443 Dumper->printAMDGPUCodeObjectMetadata();
444 if (opts::SectionGroups)
445 Dumper->printGroupSections();
446 if (opts::HashHistogram)
447 Dumper->printHashHistogram();
449 Dumper->printNotes();
452 if (opts::COFFImports)
453 Dumper->printCOFFImports();
454 if (opts::COFFExports)
455 Dumper->printCOFFExports();
456 if (opts::COFFDirectives)
457 Dumper->printCOFFDirectives();
458 if (opts::COFFBaseRelocs)
459 Dumper->printCOFFBaseReloc();
460 if (opts::COFFDebugDirectory)
461 Dumper->printCOFFDebugDirectory();
462 if (opts::COFFResources)
463 Dumper->printCOFFResources();
464 if (opts::COFFLoadConfig)
465 Dumper->printCOFFLoadConfig();
467 Dumper->printCodeViewDebugInfo();
468 if (opts::CodeViewMergedTypes)
469 Dumper->mergeCodeViewTypes(CVTypes.IDTable, CVTypes.TypeTable);
471 if (Obj->isMachO()) {
472 if (opts::MachODataInCode)
473 Dumper->printMachODataInCode();
474 if (opts::MachOIndirectSymbols)
475 Dumper->printMachOIndirectSymbols();
476 if (opts::MachOLinkerOptions)
477 Dumper->printMachOLinkerOptions();
478 if (opts::MachOSegment)
479 Dumper->printMachOSegment();
480 if (opts::MachOVersionMin)
481 Dumper->printMachOVersionMin();
482 if (opts::MachODysymtab)
483 Dumper->printMachODysymtab();
485 if (opts::PrintStackMap)
486 Dumper->printStackMap();
489 /// @brief Dumps each object file in \a Arc;
490 static void dumpArchive(const Archive *Arc) {
491 Error Err = Error::success();
492 for (auto &Child : Arc->children(Err)) {
493 Expected<std::unique_ptr<Binary>> ChildOrErr = Child.getAsBinary();
495 if (auto E = isNotObjectErrorInvalidFileType(ChildOrErr.takeError())) {
496 reportError(Arc->getFileName(), ChildOrErr.takeError());
500 if (ObjectFile *Obj = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
502 else if (COFFImportFile *Imp = dyn_cast<COFFImportFile>(&*ChildOrErr.get()))
503 dumpCOFFImportFile(Imp);
505 reportError(Arc->getFileName(), readobj_error::unrecognized_file_format);
508 reportError(Arc->getFileName(), std::move(Err));
511 /// @brief Dumps each object file in \a MachO Universal Binary;
512 static void dumpMachOUniversalBinary(const MachOUniversalBinary *UBinary) {
513 for (const MachOUniversalBinary::ObjectForArch &Obj : UBinary->objects()) {
514 Expected<std::unique_ptr<MachOObjectFile>> ObjOrErr = Obj.getAsObjectFile();
516 dumpObject(&*ObjOrErr.get());
517 else if (auto E = isNotObjectErrorInvalidFileType(ObjOrErr.takeError())) {
518 reportError(UBinary->getFileName(), ObjOrErr.takeError());
520 else if (Expected<std::unique_ptr<Archive>> AOrErr = Obj.getAsArchive())
521 dumpArchive(&*AOrErr.get());
525 /// @brief Opens \a File and dumps it.
526 static void dumpInput(StringRef File) {
528 // Attempt to open the binary.
529 Expected<OwningBinary<Binary>> BinaryOrErr = createBinary(File);
531 reportError(File, BinaryOrErr.takeError());
532 Binary &Binary = *BinaryOrErr.get().getBinary();
534 if (Archive *Arc = dyn_cast<Archive>(&Binary))
536 else if (MachOUniversalBinary *UBinary =
537 dyn_cast<MachOUniversalBinary>(&Binary))
538 dumpMachOUniversalBinary(UBinary);
539 else if (ObjectFile *Obj = dyn_cast<ObjectFile>(&Binary))
541 else if (COFFImportFile *Import = dyn_cast<COFFImportFile>(&Binary))
542 dumpCOFFImportFile(Import);
544 reportError(File, readobj_error::unrecognized_file_format);
547 int main(int argc, const char *argv[]) {
548 StringRef ToolName = argv[0];
549 sys::PrintStackTraceOnErrorSignal(ToolName);
550 PrettyStackTraceProgram X(argc, argv);
553 // Register the target printer for --version.
554 cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
556 opts::WideOutput.setHiddenFlag(cl::Hidden);
558 if (sys::path::stem(ToolName).find("readelf") != StringRef::npos)
559 opts::Output = opts::GNU;
561 cl::ParseCommandLineOptions(argc, argv, "LLVM Object Reader\n");
563 // Default to stdin if no filename is specified.
564 if (opts::InputFilenames.size() == 0)
565 opts::InputFilenames.push_back("-");
567 std::for_each(opts::InputFilenames.begin(), opts::InputFilenames.end(),
570 if (opts::CodeViewMergedTypes) {
571 ScopedPrinter W(outs());
572 dumpCodeViewMergedTypes(W, CVTypes.IDTable, CVTypes.TypeTable);