1 //===- ArchiveWriter.cpp - ar File Format implementation --------*- C++ -*-===//
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 file defines the writeArchive function.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Object/ArchiveWriter.h"
15 #include "llvm/ADT/ArrayRef.h"
16 #include "llvm/ADT/StringRef.h"
17 #include "llvm/IR/LLVMContext.h"
18 #include "llvm/Object/Archive.h"
19 #include "llvm/Object/ObjectFile.h"
20 #include "llvm/Object/SymbolicFile.h"
21 #include "llvm/Support/EndianStream.h"
22 #include "llvm/Support/Errc.h"
23 #include "llvm/Support/ErrorHandling.h"
24 #include "llvm/Support/Format.h"
25 #include "llvm/Support/Path.h"
26 #include "llvm/Support/ToolOutputFile.h"
27 #include "llvm/Support/raw_ostream.h"
29 #if !defined(_MSC_VER) && !defined(__MINGW32__)
37 NewArchiveIterator::NewArchiveIterator(object::Archive::child_iterator I,
39 : IsNewMember(false), Name(Name), OldI(I) {}
41 NewArchiveIterator::NewArchiveIterator(StringRef NewFilename, StringRef Name)
42 : IsNewMember(true), Name(Name), NewFilename(NewFilename) {}
44 StringRef NewArchiveIterator::getName() const { return Name; }
46 bool NewArchiveIterator::isNewMember() const { return IsNewMember; }
48 object::Archive::child_iterator NewArchiveIterator::getOld() const {
53 StringRef NewArchiveIterator::getNew() const {
59 NewArchiveIterator::getFD(sys::fs::file_status &NewStatus) const {
62 if (auto EC = sys::fs::openFileForRead(NewFilename, NewFD))
66 if (auto EC = sys::fs::status(NewFD, NewStatus))
69 // Opening a directory doesn't make sense. Let it fail.
70 // Linux cannot open directories with open(2), although
71 // cygwin and *bsd can.
72 if (NewStatus.type() == sys::fs::file_type::directory_file)
73 return make_error_code(errc::is_a_directory);
79 static void printWithSpacePadding(raw_fd_ostream &OS, T Data, unsigned Size,
80 bool MayTruncate = false) {
81 uint64_t OldPos = OS.tell();
83 unsigned SizeSoFar = OS.tell() - OldPos;
84 if (Size > SizeSoFar) {
85 OS.indent(Size - SizeSoFar);
86 } else if (Size < SizeSoFar) {
87 assert(MayTruncate && "Data doesn't fit in Size");
88 // Some of the data this is used for (like UID) can be larger than the
89 // space available in the archive format. Truncate in that case.
90 OS.seek(OldPos + Size);
94 static void print32(raw_ostream &Out, object::Archive::Kind Kind,
96 if (Kind == object::Archive::K_GNU)
97 support::endian::Writer<support::big>(Out).write(Val);
99 support::endian::Writer<support::little>(Out).write(Val);
102 static void printRestOfMemberHeader(raw_fd_ostream &Out,
103 const sys::TimeValue &ModTime, unsigned UID,
104 unsigned GID, unsigned Perms,
106 printWithSpacePadding(Out, ModTime.toEpochTime(), 12);
107 printWithSpacePadding(Out, UID, 6, true);
108 printWithSpacePadding(Out, GID, 6, true);
109 printWithSpacePadding(Out, format("%o", Perms), 8);
110 printWithSpacePadding(Out, Size, 10);
114 static void printGNUSmallMemberHeader(raw_fd_ostream &Out, StringRef Name,
115 const sys::TimeValue &ModTime,
116 unsigned UID, unsigned GID,
117 unsigned Perms, unsigned Size) {
118 printWithSpacePadding(Out, Twine(Name) + "/", 16);
119 printRestOfMemberHeader(Out, ModTime, UID, GID, Perms, Size);
122 static void printBSDMemberHeader(raw_fd_ostream &Out, StringRef Name,
123 const sys::TimeValue &ModTime, unsigned UID,
124 unsigned GID, unsigned Perms, unsigned Size) {
125 uint64_t PosAfterHeader = Out.tell() + 60 + Name.size();
126 // Pad so that even 64 bit object files are aligned.
127 unsigned Pad = OffsetToAlignment(PosAfterHeader, 8);
128 unsigned NameWithPadding = Name.size() + Pad;
129 printWithSpacePadding(Out, Twine("#1/") + Twine(NameWithPadding), 16);
130 printRestOfMemberHeader(Out, ModTime, UID, GID, Perms,
131 NameWithPadding + Size);
133 assert(PosAfterHeader == Out.tell());
135 Out.write(uint8_t(0));
139 printMemberHeader(raw_fd_ostream &Out, object::Archive::Kind Kind,
141 std::vector<unsigned>::iterator &StringMapIndexIter,
142 const sys::TimeValue &ModTime, unsigned UID, unsigned GID,
143 unsigned Perms, unsigned Size) {
144 if (Kind == object::Archive::K_BSD)
145 return printBSDMemberHeader(Out, Name, ModTime, UID, GID, Perms, Size);
146 if (Name.size() < 16)
147 return printGNUSmallMemberHeader(Out, Name, ModTime, UID, GID, Perms, Size);
149 printWithSpacePadding(Out, *StringMapIndexIter++, 15);
150 printRestOfMemberHeader(Out, ModTime, UID, GID, Perms, Size);
153 static void writeStringTable(raw_fd_ostream &Out,
154 ArrayRef<NewArchiveIterator> Members,
155 std::vector<unsigned> &StringMapIndexes) {
156 unsigned StartOffset = 0;
157 for (ArrayRef<NewArchiveIterator>::iterator I = Members.begin(),
160 StringRef Name = I->getName();
161 if (Name.size() < 16)
163 if (StartOffset == 0) {
164 printWithSpacePadding(Out, "//", 58);
166 StartOffset = Out.tell();
168 StringMapIndexes.push_back(Out.tell() - StartOffset);
169 Out << Name << "/\n";
171 if (StartOffset == 0)
175 int Pos = Out.tell();
176 Out.seek(StartOffset - 12);
177 printWithSpacePadding(Out, Pos - StartOffset, 10);
181 // Returns the offset of the first reference to a member offset.
182 static ErrorOr<unsigned>
183 writeSymbolTable(raw_fd_ostream &Out, object::Archive::Kind Kind,
184 ArrayRef<NewArchiveIterator> Members,
185 ArrayRef<MemoryBufferRef> Buffers,
186 std::vector<unsigned> &MemberOffsetRefs) {
187 if (Kind != object::Archive::K_GNU)
190 unsigned StartOffset = 0;
191 SmallString<128> NameBuf;
192 raw_svector_ostream NameOS(NameBuf);
194 for (unsigned MemberNum = 0, N = Members.size(); MemberNum < N; ++MemberNum) {
195 MemoryBufferRef MemberBuffer = Buffers[MemberNum];
196 ErrorOr<std::unique_ptr<object::SymbolicFile>> ObjOrErr =
197 object::SymbolicFile::createSymbolicFile(
198 MemberBuffer, sys::fs::file_magic::unknown, &Context);
200 continue; // FIXME: check only for "not an object file" errors.
201 object::SymbolicFile &Obj = *ObjOrErr.get();
204 printGNUSmallMemberHeader(Out, "", sys::TimeValue::now(), 0, 0, 0, 0);
205 StartOffset = Out.tell();
206 print32(Out, Kind, 0);
209 for (const object::BasicSymbolRef &S : Obj.symbols()) {
210 uint32_t Symflags = S.getFlags();
211 if (Symflags & object::SymbolRef::SF_FormatSpecific)
213 if (!(Symflags & object::SymbolRef::SF_Global))
215 if (Symflags & object::SymbolRef::SF_Undefined)
217 if (auto EC = S.printName(NameOS))
220 MemberOffsetRefs.push_back(MemberNum);
221 print32(Out, Kind, 0);
226 if (StartOffset == 0)
232 unsigned Pos = Out.tell();
233 Out.seek(StartOffset - 12);
234 printWithSpacePadding(Out, Pos - StartOffset, 10);
235 Out.seek(StartOffset);
236 unsigned NumSyms = MemberOffsetRefs.size();
237 print32(Out, Kind, NumSyms);
239 return StartOffset + 4;
242 std::pair<StringRef, std::error_code>
243 llvm::writeArchive(StringRef ArcName,
244 std::vector<NewArchiveIterator> &NewMembers,
245 bool WriteSymtab, object::Archive::Kind Kind) {
246 SmallString<128> TmpArchive;
248 if (auto EC = sys::fs::createUniqueFile(ArcName + ".temp-archive-%%%%%%%.a",
249 TmpArchiveFD, TmpArchive))
250 return std::make_pair(ArcName, EC);
252 tool_output_file Output(TmpArchive, TmpArchiveFD);
253 raw_fd_ostream &Out = Output.os();
256 std::vector<unsigned> MemberOffsetRefs;
258 std::vector<std::unique_ptr<MemoryBuffer>> Buffers;
259 std::vector<MemoryBufferRef> Members;
260 std::vector<sys::fs::file_status> NewMemberStatus;
262 for (unsigned I = 0, N = NewMembers.size(); I < N; ++I) {
263 NewArchiveIterator &Member = NewMembers[I];
264 MemoryBufferRef MemberRef;
266 if (Member.isNewMember()) {
267 StringRef Filename = Member.getNew();
268 NewMemberStatus.resize(NewMemberStatus.size() + 1);
269 sys::fs::file_status &Status = NewMemberStatus.back();
270 ErrorOr<int> FD = Member.getFD(Status);
271 if (auto EC = FD.getError())
272 return std::make_pair(Filename, EC);
273 ErrorOr<std::unique_ptr<MemoryBuffer>> MemberBufferOrErr =
274 MemoryBuffer::getOpenFile(FD.get(), Filename, Status.getSize(),
276 if (auto EC = MemberBufferOrErr.getError())
277 return std::make_pair(Filename, EC);
278 if (close(FD.get()) != 0)
279 return std::make_pair(Filename,
280 std::error_code(errno, std::generic_category()));
281 Buffers.push_back(std::move(MemberBufferOrErr.get()));
282 MemberRef = Buffers.back()->getMemBufferRef();
284 object::Archive::child_iterator OldMember = Member.getOld();
285 ErrorOr<MemoryBufferRef> MemberBufferOrErr =
286 OldMember->getMemoryBufferRef();
287 if (auto EC = MemberBufferOrErr.getError())
288 return std::make_pair("", EC);
289 MemberRef = MemberBufferOrErr.get();
291 Members.push_back(MemberRef);
294 unsigned MemberReferenceOffset = 0;
296 ErrorOr<unsigned> MemberReferenceOffsetOrErr =
297 writeSymbolTable(Out, Kind, NewMembers, Members, MemberOffsetRefs);
298 if (auto EC = MemberReferenceOffsetOrErr.getError())
299 return std::make_pair(ArcName, EC);
300 MemberReferenceOffset = MemberReferenceOffsetOrErr.get();
303 std::vector<unsigned> StringMapIndexes;
304 if (Kind != object::Archive::K_BSD)
305 writeStringTable(Out, NewMembers, StringMapIndexes);
307 unsigned MemberNum = 0;
308 unsigned NewMemberNum = 0;
309 std::vector<unsigned>::iterator StringMapIndexIter = StringMapIndexes.begin();
310 std::vector<unsigned> MemberOffset;
311 for (const NewArchiveIterator &I : NewMembers) {
312 MemoryBufferRef File = Members[MemberNum++];
314 unsigned Pos = Out.tell();
315 MemberOffset.push_back(Pos);
317 if (I.isNewMember()) {
318 StringRef FileName = I.getNew();
319 const sys::fs::file_status &Status = NewMemberStatus[NewMemberNum++];
320 printMemberHeader(Out, Kind, sys::path::filename(FileName),
321 StringMapIndexIter, Status.getLastModificationTime(),
322 Status.getUser(), Status.getGroup(),
323 Status.permissions(), Status.getSize());
325 object::Archive::child_iterator OldMember = I.getOld();
326 printMemberHeader(Out, Kind, I.getName(), StringMapIndexIter,
327 OldMember->getLastModified(), OldMember->getUID(),
328 OldMember->getGID(), OldMember->getAccessMode(),
329 OldMember->getSize());
332 Out << File.getBuffer();
338 if (MemberReferenceOffset) {
339 Out.seek(MemberReferenceOffset);
340 for (unsigned MemberNum : MemberOffsetRefs)
341 print32(Out, Kind, MemberOffset[MemberNum]);
346 sys::fs::rename(TmpArchive, ArcName);
347 return std::make_pair("", std::error_code());