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 "StreamWriter.h"
26 #include "llvm/Object/Archive.h"
27 #include "llvm/Object/ELFObjectFile.h"
28 #include "llvm/Object/MachOUniversal.h"
29 #include "llvm/Object/ObjectFile.h"
30 #include "llvm/Support/Casting.h"
31 #include "llvm/Support/CommandLine.h"
32 #include "llvm/Support/DataTypes.h"
33 #include "llvm/Support/Debug.h"
34 #include "llvm/Support/FileSystem.h"
35 #include "llvm/Support/ManagedStatic.h"
36 #include "llvm/Support/PrettyStackTrace.h"
37 #include "llvm/Support/Signals.h"
38 #include "llvm/Support/TargetRegistry.h"
39 #include "llvm/Support/TargetSelect.h"
41 #include <system_error>
44 using namespace llvm::object;
47 cl::list<std::string> InputFilenames(cl::Positional,
48 cl::desc("<input object files>"),
52 cl::opt<bool> FileHeaders("file-headers",
53 cl::desc("Display file headers "));
54 cl::alias FileHeadersShort("h",
55 cl::desc("Alias for --file-headers"),
56 cl::aliasopt(FileHeaders));
59 cl::opt<bool> Sections("sections",
60 cl::desc("Display all sections."));
61 cl::alias SectionsShort("s",
62 cl::desc("Alias for --sections"),
63 cl::aliasopt(Sections));
65 // -section-relocations, -sr
66 cl::opt<bool> SectionRelocations("section-relocations",
67 cl::desc("Display relocations for each section shown."));
68 cl::alias SectionRelocationsShort("sr",
69 cl::desc("Alias for --section-relocations"),
70 cl::aliasopt(SectionRelocations));
72 // -section-symbols, -st
73 cl::opt<bool> SectionSymbols("section-symbols",
74 cl::desc("Display symbols for each section shown."));
75 cl::alias SectionSymbolsShort("st",
76 cl::desc("Alias for --section-symbols"),
77 cl::aliasopt(SectionSymbols));
80 cl::opt<bool> SectionData("section-data",
81 cl::desc("Display section data for each section shown."));
82 cl::alias SectionDataShort("sd",
83 cl::desc("Alias for --section-data"),
84 cl::aliasopt(SectionData));
87 cl::opt<bool> Relocations("relocations",
88 cl::desc("Display the relocation entries in the file"));
89 cl::alias RelocationsShort("r",
90 cl::desc("Alias for --relocations"),
91 cl::aliasopt(Relocations));
94 cl::opt<bool> DynRelocs("dyn-relocations",
95 cl::desc("Display the dynamic relocation entries in the file"));
98 cl::opt<bool> Symbols("symbols",
99 cl::desc("Display the symbol table"));
100 cl::alias SymbolsShort("t",
101 cl::desc("Alias for --symbols"),
102 cl::aliasopt(Symbols));
105 cl::opt<bool> DynamicSymbols("dyn-symbols",
106 cl::desc("Display the dynamic symbol table"));
107 cl::alias DynamicSymbolsShort("dt",
108 cl::desc("Alias for --dyn-symbols"),
109 cl::aliasopt(DynamicSymbols));
112 cl::opt<bool> UnwindInfo("unwind",
113 cl::desc("Display unwind information"));
114 cl::alias UnwindInfoShort("u",
115 cl::desc("Alias for --unwind"),
116 cl::aliasopt(UnwindInfo));
119 cl::opt<bool> DynamicTable("dynamic-table",
120 cl::desc("Display the ELF .dynamic section table"));
123 cl::opt<bool> NeededLibraries("needed-libs",
124 cl::desc("Display the needed libraries"));
127 cl::opt<bool> ProgramHeaders("program-headers",
128 cl::desc("Display ELF program headers"));
131 cl::opt<bool> ExpandRelocs("expand-relocs",
132 cl::desc("Expand each shown relocation to multiple lines"));
135 cl::opt<bool> CodeView("codeview",
136 cl::desc("Display CodeView debug information"));
138 // -codeview-subsection-bytes
139 cl::opt<bool> CodeViewSubsectionBytes(
140 "codeview-subsection-bytes",
141 cl::desc("Dump raw contents of codeview debug sections and records"));
143 // -arm-attributes, -a
144 cl::opt<bool> ARMAttributes("arm-attributes",
145 cl::desc("Display the ARM attributes section"));
146 cl::alias ARMAttributesShort("-a", cl::desc("Alias for --arm-attributes"),
147 cl::aliasopt(ARMAttributes));
151 MipsPLTGOT("mips-plt-got",
152 cl::desc("Display the MIPS GOT and PLT GOT sections"));
155 cl::opt<bool> MipsABIFlags("mips-abi-flags",
156 cl::desc("Display the MIPS.abiflags section"));
159 cl::opt<bool> MipsReginfo("mips-reginfo",
160 cl::desc("Display the MIPS .reginfo section"));
164 COFFImports("coff-imports", cl::desc("Display the PE/COFF import table"));
168 COFFExports("coff-exports", cl::desc("Display the PE/COFF export table"));
172 COFFDirectives("coff-directives",
173 cl::desc("Display the PE/COFF .drectve section"));
177 COFFBaseRelocs("coff-basereloc",
178 cl::desc("Display the PE/COFF .reloc section"));
181 static int ReturnValue = EXIT_SUCCESS;
185 bool error(std::error_code EC) {
189 ReturnValue = EXIT_FAILURE;
190 outs() << "\nError reading file: " << EC.message() << ".\n";
195 bool relocAddressLess(RelocationRef a, RelocationRef b) {
196 uint64_t a_addr, b_addr;
197 if (error(a.getOffset(a_addr))) exit(ReturnValue);
198 if (error(b.getOffset(b_addr))) exit(ReturnValue);
199 return a_addr < b_addr;
204 static void reportError(StringRef Input, std::error_code EC) {
208 errs() << Input << ": " << EC.message() << "\n";
210 ReturnValue = EXIT_FAILURE;
213 static void reportError(StringRef Input, StringRef Message) {
217 errs() << Input << ": " << Message << "\n";
218 ReturnValue = EXIT_FAILURE;
221 static bool isMipsArch(unsigned Arch) {
223 case llvm::Triple::mips:
224 case llvm::Triple::mipsel:
225 case llvm::Triple::mips64:
226 case llvm::Triple::mips64el:
233 /// @brief Creates an format-specific object file dumper.
234 static std::error_code createDumper(const ObjectFile *Obj, StreamWriter &Writer,
235 std::unique_ptr<ObjDumper> &Result) {
237 return readobj_error::unsupported_file_format;
240 return createCOFFDumper(Obj, Writer, Result);
242 return createELFDumper(Obj, Writer, Result);
244 return createMachODumper(Obj, Writer, Result);
246 return readobj_error::unsupported_obj_file_format;
249 static StringRef getLoadName(const ObjectFile *Obj) {
250 if (auto *ELF = dyn_cast<ELF32LEObjectFile>(Obj))
251 return ELF->getLoadName();
252 if (auto *ELF = dyn_cast<ELF64LEObjectFile>(Obj))
253 return ELF->getLoadName();
254 if (auto *ELF = dyn_cast<ELF32BEObjectFile>(Obj))
255 return ELF->getLoadName();
256 if (auto *ELF = dyn_cast<ELF64BEObjectFile>(Obj))
257 return ELF->getLoadName();
258 llvm_unreachable("Not ELF");
261 /// @brief Dumps the specified object file.
262 static void dumpObject(const ObjectFile *Obj) {
263 StreamWriter Writer(outs());
264 std::unique_ptr<ObjDumper> Dumper;
265 if (std::error_code EC = createDumper(Obj, Writer, Dumper)) {
266 reportError(Obj->getFileName(), EC);
271 outs() << "File: " << Obj->getFileName() << "\n";
272 outs() << "Format: " << Obj->getFileFormatName() << "\n";
274 << Triple::getArchTypeName((llvm::Triple::ArchType)Obj->getArch())
276 outs() << "AddressSize: " << (8*Obj->getBytesInAddress()) << "bit\n";
278 outs() << "LoadName: " << getLoadName(Obj) << "\n";
280 if (opts::FileHeaders)
281 Dumper->printFileHeaders();
283 Dumper->printSections();
284 if (opts::Relocations)
285 Dumper->printRelocations();
287 Dumper->printDynamicRelocations();
289 Dumper->printSymbols();
290 if (opts::DynamicSymbols)
291 Dumper->printDynamicSymbols();
292 if (opts::UnwindInfo)
293 Dumper->printUnwindInfo();
294 if (opts::DynamicTable)
295 Dumper->printDynamicTable();
296 if (opts::NeededLibraries)
297 Dumper->printNeededLibraries();
298 if (opts::ProgramHeaders)
299 Dumper->printProgramHeaders();
300 if (Obj->getArch() == llvm::Triple::arm && Obj->isELF())
301 if (opts::ARMAttributes)
302 Dumper->printAttributes();
303 if (isMipsArch(Obj->getArch()) && Obj->isELF()) {
304 if (opts::MipsPLTGOT)
305 Dumper->printMipsPLTGOT();
306 if (opts::MipsABIFlags)
307 Dumper->printMipsABIFlags();
308 if (opts::MipsReginfo)
309 Dumper->printMipsReginfo();
311 if (opts::COFFImports)
312 Dumper->printCOFFImports();
313 if (opts::COFFExports)
314 Dumper->printCOFFExports();
315 if (opts::COFFDirectives)
316 Dumper->printCOFFDirectives();
317 if (opts::COFFBaseRelocs)
318 Dumper->printCOFFBaseReloc();
321 /// @brief Dumps each object file in \a Arc;
322 static void dumpArchive(const Archive *Arc) {
323 for (Archive::child_iterator ArcI = Arc->child_begin(),
324 ArcE = Arc->child_end();
325 ArcI != ArcE; ++ArcI) {
326 ErrorOr<std::unique_ptr<Binary>> ChildOrErr = ArcI->getAsBinary();
327 if (std::error_code EC = ChildOrErr.getError()) {
328 // Ignore non-object files.
329 if (EC != object_error::invalid_file_type)
330 reportError(Arc->getFileName(), EC.message());
334 if (ObjectFile *Obj = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
337 reportError(Arc->getFileName(), readobj_error::unrecognized_file_format);
341 /// @brief Dumps each object file in \a MachO Universal Binary;
342 static void dumpMachOUniversalBinary(const MachOUniversalBinary *UBinary) {
343 for (const MachOUniversalBinary::ObjectForArch &Obj : UBinary->objects()) {
344 ErrorOr<std::unique_ptr<MachOObjectFile>> ObjOrErr = Obj.getAsObjectFile();
346 dumpObject(&*ObjOrErr.get());
347 else if (ErrorOr<std::unique_ptr<Archive>> AOrErr = Obj.getAsArchive())
348 dumpArchive(&*AOrErr.get());
350 reportError(UBinary->getFileName(), ObjOrErr.getError().message());
354 /// @brief Opens \a File and dumps it.
355 static void dumpInput(StringRef File) {
356 // If file isn't stdin, check that it exists.
357 if (File != "-" && !sys::fs::exists(File)) {
358 reportError(File, readobj_error::file_not_found);
362 // Attempt to open the binary.
363 ErrorOr<OwningBinary<Binary>> BinaryOrErr = createBinary(File);
364 if (std::error_code EC = BinaryOrErr.getError()) {
365 reportError(File, EC);
368 Binary &Binary = *BinaryOrErr.get().getBinary();
370 if (Archive *Arc = dyn_cast<Archive>(&Binary))
372 else if (MachOUniversalBinary *UBinary =
373 dyn_cast<MachOUniversalBinary>(&Binary))
374 dumpMachOUniversalBinary(UBinary);
375 else if (ObjectFile *Obj = dyn_cast<ObjectFile>(&Binary))
378 reportError(File, readobj_error::unrecognized_file_format);
381 int main(int argc, const char *argv[]) {
382 sys::PrintStackTraceOnErrorSignal();
383 PrettyStackTraceProgram X(argc, argv);
386 // Register the target printer for --version.
387 cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
389 cl::ParseCommandLineOptions(argc, argv, "LLVM Object Reader\n");
391 // Default to stdin if no filename is specified.
392 if (opts::InputFilenames.size() == 0)
393 opts::InputFilenames.push_back("-");
395 std::for_each(opts::InputFilenames.begin(), opts::InputFilenames.end(),