1 //===- ELFObjcopy.cpp -----------------------------------------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 #include "ELFObjcopy.h"
11 #include "CopyConfig.h"
13 #include "llvm-objcopy.h"
15 #include "llvm/ADT/BitmaskEnum.h"
16 #include "llvm/ADT/Optional.h"
17 #include "llvm/ADT/STLExtras.h"
18 #include "llvm/ADT/SmallVector.h"
19 #include "llvm/ADT/StringRef.h"
20 #include "llvm/ADT/Twine.h"
21 #include "llvm/BinaryFormat/ELF.h"
22 #include "llvm/MC/MCTargetOptions.h"
23 #include "llvm/Object/Binary.h"
24 #include "llvm/Object/ELFObjectFile.h"
25 #include "llvm/Object/ELFTypes.h"
26 #include "llvm/Object/Error.h"
27 #include "llvm/Option/Option.h"
28 #include "llvm/Support/Casting.h"
29 #include "llvm/Support/Compression.h"
30 #include "llvm/Support/Errc.h"
31 #include "llvm/Support/Error.h"
32 #include "llvm/Support/ErrorHandling.h"
33 #include "llvm/Support/ErrorOr.h"
34 #include "llvm/Support/Memory.h"
35 #include "llvm/Support/Path.h"
36 #include "llvm/Support/raw_ostream.h"
44 #include <system_error>
51 using namespace object;
53 using SectionPred = std::function<bool(const SectionBase &Sec)>;
55 static bool isDebugSection(const SectionBase &Sec) {
56 return StringRef(Sec.Name).startswith(".debug") ||
57 StringRef(Sec.Name).startswith(".zdebug") || Sec.Name == ".gdb_index";
60 static bool isDWOSection(const SectionBase &Sec) {
61 return StringRef(Sec.Name).endswith(".dwo");
64 static bool onlyKeepDWOPred(const Object &Obj, const SectionBase &Sec) {
65 // We can't remove the section header string table.
66 if (&Sec == Obj.SectionNames)
68 // Short of keeping the string table we want to keep everything that is a DWO
69 // section and remove everything else.
70 return !isDWOSection(Sec);
73 static uint64_t setSectionFlagsPreserveMask(uint64_t OldFlags,
75 // Preserve some flags which should not be dropped when setting flags.
76 // Also, preserve anything OS/processor dependant.
77 const uint64_t PreserveMask = ELF::SHF_COMPRESSED | ELF::SHF_EXCLUDE |
78 ELF::SHF_GROUP | ELF::SHF_LINK_ORDER |
79 ELF::SHF_MASKOS | ELF::SHF_MASKPROC |
80 ELF::SHF_TLS | ELF::SHF_INFO_LINK;
81 return (OldFlags & PreserveMask) | (NewFlags & ~PreserveMask);
84 static ElfType getOutputElfType(const Binary &Bin) {
85 // Infer output ELF type from the input ELF object
86 if (isa<ELFObjectFile<ELF32LE>>(Bin))
88 if (isa<ELFObjectFile<ELF64LE>>(Bin))
90 if (isa<ELFObjectFile<ELF32BE>>(Bin))
92 if (isa<ELFObjectFile<ELF64BE>>(Bin))
94 llvm_unreachable("Invalid ELFType");
97 static ElfType getOutputElfType(const MachineInfo &MI) {
98 // Infer output ELF type from the binary arch specified
100 return MI.IsLittleEndian ? ELFT_ELF64LE : ELFT_ELF64BE;
102 return MI.IsLittleEndian ? ELFT_ELF32LE : ELFT_ELF32BE;
105 static std::unique_ptr<Writer> createWriter(const CopyConfig &Config,
106 Object &Obj, Buffer &Buf,
107 ElfType OutputElfType) {
108 if (Config.OutputFormat == "binary") {
109 return llvm::make_unique<BinaryWriter>(Obj, Buf);
111 // Depending on the initial ELFT and OutputFormat we need a different Writer.
112 switch (OutputElfType) {
114 return llvm::make_unique<ELFWriter<ELF32LE>>(Obj, Buf,
115 !Config.StripSections);
117 return llvm::make_unique<ELFWriter<ELF64LE>>(Obj, Buf,
118 !Config.StripSections);
120 return llvm::make_unique<ELFWriter<ELF32BE>>(Obj, Buf,
121 !Config.StripSections);
123 return llvm::make_unique<ELFWriter<ELF64BE>>(Obj, Buf,
124 !Config.StripSections);
126 llvm_unreachable("Invalid output format");
129 template <class ELFT>
130 static Expected<ArrayRef<uint8_t>>
131 findBuildID(const object::ELFFile<ELFT> &In) {
132 for (const auto &Phdr : unwrapOrError(In.program_headers())) {
133 if (Phdr.p_type != PT_NOTE)
135 Error Err = Error::success();
136 for (const auto &Note : In.notes(Phdr, Err))
137 if (Note.getType() == NT_GNU_BUILD_ID && Note.getName() == ELF_NOTE_GNU)
138 return Note.getDesc();
140 return std::move(Err);
142 return createStringError(llvm::errc::invalid_argument,
143 "Could not find build ID.");
146 static Expected<ArrayRef<uint8_t>>
147 findBuildID(const object::ELFObjectFileBase &In) {
148 if (auto *O = dyn_cast<ELFObjectFile<ELF32LE>>(&In))
149 return findBuildID(*O->getELFFile());
150 else if (auto *O = dyn_cast<ELFObjectFile<ELF64LE>>(&In))
151 return findBuildID(*O->getELFFile());
152 else if (auto *O = dyn_cast<ELFObjectFile<ELF32BE>>(&In))
153 return findBuildID(*O->getELFFile());
154 else if (auto *O = dyn_cast<ELFObjectFile<ELF64BE>>(&In))
155 return findBuildID(*O->getELFFile());
157 llvm_unreachable("Bad file format");
160 template <class... Ts>
161 static Error makeStringError(std::error_code EC, const Twine &Msg, Ts&&... Args) {
162 std::string FullMsg = (EC.message() + ": " + Msg).str();
163 return createStringError(EC, FullMsg.c_str(), std::forward<Ts>(Args)...);
166 #define MODEL_8 "%%%%%%%%"
167 #define MODEL_16 MODEL_8 MODEL_8
168 #define MODEL_32 (MODEL_16 MODEL_16)
170 static Error linkToBuildIdDir(const CopyConfig &Config, StringRef ToLink,
172 ArrayRef<uint8_t> BuildIdBytes) {
173 SmallString<128> Path = Config.BuildIdLinkDir;
174 sys::path::append(Path, llvm::toHex(BuildIdBytes[0], /*LowerCase*/ true));
175 if (auto EC = sys::fs::create_directories(Path))
176 return createFileError(
178 makeStringError(EC, "cannot create build ID link directory"));
180 sys::path::append(Path,
181 llvm::toHex(BuildIdBytes.slice(1), /*LowerCase*/ true));
183 SmallString<128> TmpPath;
184 // create_hard_link races so we need to link to a temporary path but
185 // we want to make sure that we choose a filename that does not exist.
186 // By using 32 model characters we get 128-bits of entropy. It is
187 // unlikely that this string has ever existed before much less exists
188 // on this disk or in the current working directory.
189 // Additionally we prepend the original Path for debugging but also
190 // because it ensures that we're linking within a directory on the same
191 // partition on the same device which is critical. It has the added
192 // win of yet further decreasing the odds of a conflict.
193 sys::fs::createUniquePath(Twine(Path) + "-" + MODEL_32 + ".tmp", TmpPath,
194 /*MakeAbsolute*/ false);
195 if (auto EC = sys::fs::create_hard_link(ToLink, TmpPath)) {
196 Path.push_back('\0');
197 return makeStringError(EC, "cannot link %s to %s", ToLink.data(),
200 // We then atomically rename the link into place which will just move the
201 // link. If rename fails something is more seriously wrong so just return
203 if (auto EC = sys::fs::rename(TmpPath, Path)) {
204 Path.push_back('\0');
205 return makeStringError(EC, "cannot link %s to %s", ToLink.data(),
208 // If `Path` was already a hard-link to the same underlying file then the
209 // temp file will be left so we need to remove it. Remove will not cause
210 // an error by default if the file is already gone so just blindly remove
211 // it rather than checking.
212 if (auto EC = sys::fs::remove(TmpPath)) {
213 TmpPath.push_back('\0');
214 return makeStringError(EC, "could not remove %s", TmpPath.data());
216 return Error::success();
219 static Error splitDWOToFile(const CopyConfig &Config, const Reader &Reader,
220 StringRef File, ElfType OutputElfType) {
221 auto DWOFile = Reader.create();
222 auto OnlyKeepDWOPred = [&DWOFile](const SectionBase &Sec) {
223 return onlyKeepDWOPred(*DWOFile, Sec);
225 if (Error E = DWOFile->removeSections(OnlyKeepDWOPred))
227 if (Config.OutputArch)
228 DWOFile->Machine = Config.OutputArch.getValue().EMachine;
230 auto Writer = createWriter(Config, *DWOFile, FB, OutputElfType);
231 if (Error E = Writer->finalize())
233 return Writer->write();
236 static Error dumpSectionToFile(StringRef SecName, StringRef Filename,
238 for (auto &Sec : Obj.sections()) {
239 if (Sec.Name == SecName) {
240 if (Sec.OriginalData.empty())
241 return createStringError(
242 object_error::parse_failed,
243 "Can't dump section \"%s\": it has no contents",
244 SecName.str().c_str());
245 Expected<std::unique_ptr<FileOutputBuffer>> BufferOrErr =
246 FileOutputBuffer::create(Filename, Sec.OriginalData.size());
248 return BufferOrErr.takeError();
249 std::unique_ptr<FileOutputBuffer> Buf = std::move(*BufferOrErr);
250 std::copy(Sec.OriginalData.begin(), Sec.OriginalData.end(),
251 Buf->getBufferStart());
252 if (Error E = Buf->commit())
254 return Error::success();
257 return createStringError(object_error::parse_failed, "Section not found");
260 static bool isCompressable(const SectionBase &Section) {
261 return !(Section.Flags & ELF::SHF_COMPRESSED) &&
262 StringRef(Section.Name).startswith(".debug");
265 static void replaceDebugSections(
266 Object &Obj, SectionPred &RemovePred,
267 function_ref<bool(const SectionBase &)> shouldReplace,
268 function_ref<SectionBase *(const SectionBase *)> addSection) {
269 // Build a list of the debug sections we are going to replace.
270 // We can't call `addSection` while iterating over sections,
271 // because it would mutate the sections array.
272 SmallVector<SectionBase *, 13> ToReplace;
273 for (auto &Sec : Obj.sections())
274 if (shouldReplace(Sec))
275 ToReplace.push_back(&Sec);
277 // Build a mapping from original section to a new one.
278 DenseMap<SectionBase *, SectionBase *> FromTo;
279 for (SectionBase *S : ToReplace)
280 FromTo[S] = addSection(S);
282 // Now we want to update the target sections of relocation
283 // sections. Also we will update the relocations themselves
284 // to update the symbol references.
285 for (auto &Sec : Obj.sections())
286 Sec.replaceSectionReferences(FromTo);
288 RemovePred = [shouldReplace, RemovePred](const SectionBase &Sec) {
289 return shouldReplace(Sec) || RemovePred(Sec);
293 static bool isUnneededSymbol(const Symbol &Sym) {
294 return !Sym.Referenced &&
295 (Sym.Binding == STB_LOCAL || Sym.getShndx() == SHN_UNDEF) &&
296 Sym.Type != STT_FILE && Sym.Type != STT_SECTION;
299 // This function handles the high level operations of GNU objcopy including
300 // handling command line options. It's important to outline certain properties
301 // we expect to hold of the command line operations. Any operation that "keeps"
302 // should keep regardless of a remove. Additionally any removal should respect
303 // any previous removals. Lastly whether or not something is removed shouldn't
304 // depend a) on the order the options occur in or b) on some opaque priority
305 // system. The only priority is that keeps/copies overrule removes.
306 static Error handleArgs(const CopyConfig &Config, Object &Obj,
307 const Reader &Reader, ElfType OutputElfType) {
309 if (!Config.SplitDWO.empty())
311 splitDWOToFile(Config, Reader, Config.SplitDWO, OutputElfType))
314 if (Config.OutputArch)
315 Obj.Machine = Config.OutputArch.getValue().EMachine;
317 // TODO: update or remove symbols only if there is an option that affects
319 if (Obj.SymbolTable) {
320 Obj.SymbolTable->updateSymbols([&](Symbol &Sym) {
321 // Common and undefined symbols don't make sense as local symbols, and can
322 // even cause crashes if we localize those, so skip them.
323 if (!Sym.isCommon() && Sym.getShndx() != SHN_UNDEF &&
324 ((Config.LocalizeHidden &&
325 (Sym.Visibility == STV_HIDDEN || Sym.Visibility == STV_INTERNAL)) ||
326 is_contained(Config.SymbolsToLocalize, Sym.Name)))
327 Sym.Binding = STB_LOCAL;
329 // Note: these two globalize flags have very similar names but different
332 // --globalize-symbol: promote a symbol to global
333 // --keep-global-symbol: all symbols except for these should be made local
335 // If --globalize-symbol is specified for a given symbol, it will be
336 // global in the output file even if it is not included via
337 // --keep-global-symbol. Because of that, make sure to check
338 // --globalize-symbol second.
339 if (!Config.SymbolsToKeepGlobal.empty() &&
340 !is_contained(Config.SymbolsToKeepGlobal, Sym.Name) &&
341 Sym.getShndx() != SHN_UNDEF)
342 Sym.Binding = STB_LOCAL;
344 if (is_contained(Config.SymbolsToGlobalize, Sym.Name) &&
345 Sym.getShndx() != SHN_UNDEF)
346 Sym.Binding = STB_GLOBAL;
348 if (is_contained(Config.SymbolsToWeaken, Sym.Name) &&
349 Sym.Binding == STB_GLOBAL)
350 Sym.Binding = STB_WEAK;
352 if (Config.Weaken && Sym.Binding == STB_GLOBAL &&
353 Sym.getShndx() != SHN_UNDEF)
354 Sym.Binding = STB_WEAK;
356 const auto I = Config.SymbolsToRename.find(Sym.Name);
357 if (I != Config.SymbolsToRename.end())
358 Sym.Name = I->getValue();
360 if (!Config.SymbolsPrefix.empty() && Sym.Type != STT_SECTION)
361 Sym.Name = (Config.SymbolsPrefix + Sym.Name).str();
364 // The purpose of this loop is to mark symbols referenced by sections
365 // (like GroupSection or RelocationSection). This way, we know which
366 // symbols are still 'needed' and which are not.
367 if (Config.StripUnneeded || !Config.UnneededSymbolsToRemove.empty()) {
368 for (auto &Section : Obj.sections())
369 Section.markSymbols();
372 auto RemoveSymbolsPred = [&](const Symbol &Sym) {
373 if (is_contained(Config.SymbolsToKeep, Sym.Name) ||
374 (Config.KeepFileSymbols && Sym.Type == STT_FILE))
377 if ((Config.DiscardMode == DiscardType::All ||
378 (Config.DiscardMode == DiscardType::Locals &&
379 StringRef(Sym.Name).startswith(".L"))) &&
380 Sym.Binding == STB_LOCAL && Sym.getShndx() != SHN_UNDEF &&
381 Sym.Type != STT_FILE && Sym.Type != STT_SECTION)
384 if (Config.StripAll || Config.StripAllGNU)
387 if (is_contained(Config.SymbolsToRemove, Sym.Name))
390 if ((Config.StripUnneeded ||
391 is_contained(Config.UnneededSymbolsToRemove, Sym.Name)) &&
392 isUnneededSymbol(Sym))
397 if (Error E = Obj.removeSymbols(RemoveSymbolsPred))
401 SectionPred RemovePred = [](const SectionBase &) { return false; };
404 if (!Config.ToRemove.empty()) {
405 RemovePred = [&Config](const SectionBase &Sec) {
406 return is_contained(Config.ToRemove, Sec.Name);
410 if (Config.StripDWO || !Config.SplitDWO.empty())
411 RemovePred = [RemovePred](const SectionBase &Sec) {
412 return isDWOSection(Sec) || RemovePred(Sec);
415 if (Config.ExtractDWO)
416 RemovePred = [RemovePred, &Obj](const SectionBase &Sec) {
417 return onlyKeepDWOPred(Obj, Sec) || RemovePred(Sec);
420 if (Config.StripAllGNU)
421 RemovePred = [RemovePred, &Obj](const SectionBase &Sec) {
424 if ((Sec.Flags & SHF_ALLOC) != 0)
426 if (&Sec == Obj.SectionNames)
435 return isDebugSection(Sec);
438 if (Config.StripSections) {
439 RemovePred = [RemovePred](const SectionBase &Sec) {
440 return RemovePred(Sec) || Sec.ParentSegment == nullptr;
444 if (Config.StripDebug) {
445 RemovePred = [RemovePred](const SectionBase &Sec) {
446 return RemovePred(Sec) || isDebugSection(Sec);
450 if (Config.StripNonAlloc)
451 RemovePred = [RemovePred, &Obj](const SectionBase &Sec) {
454 if (&Sec == Obj.SectionNames)
456 return (Sec.Flags & SHF_ALLOC) == 0 && Sec.ParentSegment == nullptr;
460 RemovePred = [RemovePred, &Obj](const SectionBase &Sec) {
463 if (&Sec == Obj.SectionNames)
465 if (StringRef(Sec.Name).startswith(".gnu.warning"))
467 if (Sec.ParentSegment != nullptr)
469 return (Sec.Flags & SHF_ALLOC) == 0;
473 if (!Config.OnlySection.empty()) {
474 RemovePred = [&Config, RemovePred, &Obj](const SectionBase &Sec) {
475 // Explicitly keep these sections regardless of previous removes.
476 if (is_contained(Config.OnlySection, Sec.Name))
479 // Allow all implicit removes.
483 // Keep special sections.
484 if (Obj.SectionNames == &Sec)
486 if (Obj.SymbolTable == &Sec ||
487 (Obj.SymbolTable && Obj.SymbolTable->getStrTab() == &Sec))
490 // Remove everything else.
495 if (!Config.KeepSection.empty()) {
496 RemovePred = [&Config, RemovePred](const SectionBase &Sec) {
497 // Explicitly keep these sections regardless of previous removes.
498 if (is_contained(Config.KeepSection, Sec.Name))
500 // Otherwise defer to RemovePred.
501 return RemovePred(Sec);
505 // This has to be the last predicate assignment.
506 // If the option --keep-symbol has been specified
507 // and at least one of those symbols is present
508 // (equivalently, the updated symbol table is not empty)
509 // the symbol table and the string table should not be removed.
510 if ((!Config.SymbolsToKeep.empty() || Config.KeepFileSymbols) &&
511 Obj.SymbolTable && !Obj.SymbolTable->empty()) {
512 RemovePred = [&Obj, RemovePred](const SectionBase &Sec) {
513 if (&Sec == Obj.SymbolTable || &Sec == Obj.SymbolTable->getStrTab())
515 return RemovePred(Sec);
519 if (Config.CompressionType != DebugCompressionType::None)
520 replaceDebugSections(Obj, RemovePred, isCompressable,
521 [&Config, &Obj](const SectionBase *S) {
522 return &Obj.addSection<CompressedSection>(
523 *S, Config.CompressionType);
525 else if (Config.DecompressDebugSections)
526 replaceDebugSections(
528 [](const SectionBase &S) { return isa<CompressedSection>(&S); },
529 [&Obj](const SectionBase *S) {
530 auto CS = cast<CompressedSection>(S);
531 return &Obj.addSection<DecompressedSection>(*CS);
534 if (Error E = Obj.removeSections(RemovePred))
537 if (!Config.SectionsToRename.empty()) {
538 for (auto &Sec : Obj.sections()) {
539 const auto Iter = Config.SectionsToRename.find(Sec.Name);
540 if (Iter != Config.SectionsToRename.end()) {
541 const SectionRename &SR = Iter->second;
542 Sec.Name = SR.NewName;
543 if (SR.NewFlags.hasValue())
545 setSectionFlagsPreserveMask(Sec.Flags, SR.NewFlags.getValue());
550 if (!Config.SetSectionFlags.empty()) {
551 for (auto &Sec : Obj.sections()) {
552 const auto Iter = Config.SetSectionFlags.find(Sec.Name);
553 if (Iter != Config.SetSectionFlags.end()) {
554 const SectionFlagsUpdate &SFU = Iter->second;
555 Sec.Flags = setSectionFlagsPreserveMask(Sec.Flags, SFU.NewFlags);
560 for (const auto &Flag : Config.AddSection) {
561 std::pair<StringRef, StringRef> SecPair = Flag.split("=");
562 StringRef SecName = SecPair.first;
563 StringRef File = SecPair.second;
564 ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr =
565 MemoryBuffer::getFile(File);
567 return createFileError(File, errorCodeToError(BufOrErr.getError()));
568 std::unique_ptr<MemoryBuffer> Buf = std::move(*BufOrErr);
569 ArrayRef<uint8_t> Data(
570 reinterpret_cast<const uint8_t *>(Buf->getBufferStart()),
571 Buf->getBufferSize());
572 OwnedDataSection &NewSection =
573 Obj.addSection<OwnedDataSection>(SecName, Data);
574 if (SecName.startswith(".note") && SecName != ".note.GNU-stack")
575 NewSection.Type = SHT_NOTE;
578 for (const auto &Flag : Config.DumpSection) {
579 std::pair<StringRef, StringRef> SecPair = Flag.split("=");
580 StringRef SecName = SecPair.first;
581 StringRef File = SecPair.second;
582 if (Error E = dumpSectionToFile(SecName, File, Obj))
583 return createFileError(Config.InputFilename, std::move(E));
586 if (!Config.AddGnuDebugLink.empty())
587 Obj.addSection<GnuDebugLinkSection>(Config.AddGnuDebugLink);
589 for (const NewSymbolInfo &SI : Config.SymbolsToAdd) {
590 SectionBase *Sec = Obj.findSection(SI.SectionName);
591 uint64_t Value = Sec ? Sec->Addr + SI.Value : SI.Value;
592 Obj.SymbolTable->addSymbol(
593 SI.SymbolName, SI.Bind, SI.Type, Sec, Value, SI.Visibility,
594 Sec ? (uint16_t)SYMBOL_SIMPLE_INDEX : (uint16_t)SHN_ABS, 0);
597 if (Config.EntryExpr)
598 Obj.Entry = Config.EntryExpr(Obj.Entry);
599 return Error::success();
602 Error executeObjcopyOnRawBinary(const CopyConfig &Config, MemoryBuffer &In,
604 BinaryReader Reader(Config.BinaryArch, &In);
605 std::unique_ptr<Object> Obj = Reader.create();
607 // Prefer OutputArch (-O<format>) if set, otherwise fallback to BinaryArch
609 const ElfType OutputElfType = getOutputElfType(
610 Config.OutputArch ? Config.OutputArch.getValue() : Config.BinaryArch);
611 if (Error E = handleArgs(Config, *Obj, Reader, OutputElfType))
613 std::unique_ptr<Writer> Writer =
614 createWriter(Config, *Obj, Out, OutputElfType);
615 if (Error E = Writer->finalize())
617 return Writer->write();
620 Error executeObjcopyOnBinary(const CopyConfig &Config,
621 object::ELFObjectFileBase &In, Buffer &Out) {
622 ELFReader Reader(&In);
623 std::unique_ptr<Object> Obj = Reader.create();
624 // Prefer OutputArch (-O<format>) if set, otherwise infer it from the input.
625 const ElfType OutputElfType =
626 Config.OutputArch ? getOutputElfType(Config.OutputArch.getValue())
627 : getOutputElfType(In);
628 ArrayRef<uint8_t> BuildIdBytes;
630 if (!Config.BuildIdLinkDir.empty()) {
631 BuildIdBytes = unwrapOrError(findBuildID(In));
632 if (BuildIdBytes.size() < 2)
633 return createFileError(
634 Config.InputFilename,
635 createStringError(object_error::parse_failed,
636 "build ID is smaller than two bytes."));
639 if (!Config.BuildIdLinkDir.empty() && Config.BuildIdLinkInput)
641 linkToBuildIdDir(Config, Config.InputFilename,
642 Config.BuildIdLinkInput.getValue(), BuildIdBytes))
645 if (Error E = handleArgs(Config, *Obj, Reader, OutputElfType))
647 std::unique_ptr<Writer> Writer =
648 createWriter(Config, *Obj, Out, OutputElfType);
649 if (Error E = Writer->finalize())
651 if (Error E = Writer->write())
653 if (!Config.BuildIdLinkDir.empty() && Config.BuildIdLinkOutput)
655 linkToBuildIdDir(Config, Config.OutputFilename,
656 Config.BuildIdLinkOutput.getValue(), BuildIdBytes))
659 return Error::success();
662 } // end namespace elf
663 } // end namespace objcopy
664 } // end namespace llvm