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-rw-r--r--contrib/llvm/lib/Object/ArchiveWriter.cpp630
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diff --git a/contrib/llvm/lib/Object/ArchiveWriter.cpp b/contrib/llvm/lib/Object/ArchiveWriter.cpp
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-//===- ArchiveWriter.cpp - ar File Format implementation --------*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file defines the writeArchive function.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Object/ArchiveWriter.h"
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/BinaryFormat/Magic.h"
-#include "llvm/IR/LLVMContext.h"
-#include "llvm/Object/Archive.h"
-#include "llvm/Object/ObjectFile.h"
-#include "llvm/Object/SymbolicFile.h"
-#include "llvm/Support/EndianStream.h"
-#include "llvm/Support/Errc.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/Format.h"
-#include "llvm/Support/Path.h"
-#include "llvm/Support/ToolOutputFile.h"
-#include "llvm/Support/raw_ostream.h"
-
-#include <map>
-
-#if !defined(_MSC_VER) && !defined(__MINGW32__)
-#include <unistd.h>
-#else
-#include <io.h>
-#endif
-
-using namespace llvm;
-
-NewArchiveMember::NewArchiveMember(MemoryBufferRef BufRef)
- : Buf(MemoryBuffer::getMemBuffer(BufRef, false)),
- MemberName(BufRef.getBufferIdentifier()) {}
-
-Expected<NewArchiveMember>
-NewArchiveMember::getOldMember(const object::Archive::Child &OldMember,
- bool Deterministic) {
- Expected<llvm::MemoryBufferRef> BufOrErr = OldMember.getMemoryBufferRef();
- if (!BufOrErr)
- return BufOrErr.takeError();
-
- NewArchiveMember M;
- M.Buf = MemoryBuffer::getMemBuffer(*BufOrErr, false);
- M.MemberName = M.Buf->getBufferIdentifier();
- if (!Deterministic) {
- auto ModTimeOrErr = OldMember.getLastModified();
- if (!ModTimeOrErr)
- return ModTimeOrErr.takeError();
- M.ModTime = ModTimeOrErr.get();
- Expected<unsigned> UIDOrErr = OldMember.getUID();
- if (!UIDOrErr)
- return UIDOrErr.takeError();
- M.UID = UIDOrErr.get();
- Expected<unsigned> GIDOrErr = OldMember.getGID();
- if (!GIDOrErr)
- return GIDOrErr.takeError();
- M.GID = GIDOrErr.get();
- Expected<sys::fs::perms> AccessModeOrErr = OldMember.getAccessMode();
- if (!AccessModeOrErr)
- return AccessModeOrErr.takeError();
- M.Perms = AccessModeOrErr.get();
- }
- return std::move(M);
-}
-
-Expected<NewArchiveMember> NewArchiveMember::getFile(StringRef FileName,
- bool Deterministic) {
- sys::fs::file_status Status;
- auto FDOrErr = sys::fs::openNativeFileForRead(FileName);
- if (!FDOrErr)
- return FDOrErr.takeError();
- sys::fs::file_t FD = *FDOrErr;
- assert(FD != sys::fs::kInvalidFile);
-
- if (auto EC = sys::fs::status(FD, Status))
- return errorCodeToError(EC);
-
- // Opening a directory doesn't make sense. Let it fail.
- // Linux cannot open directories with open(2), although
- // cygwin and *bsd can.
- if (Status.type() == sys::fs::file_type::directory_file)
- return errorCodeToError(make_error_code(errc::is_a_directory));
-
- ErrorOr<std::unique_ptr<MemoryBuffer>> MemberBufferOrErr =
- MemoryBuffer::getOpenFile(FD, FileName, Status.getSize(), false);
- if (!MemberBufferOrErr)
- return errorCodeToError(MemberBufferOrErr.getError());
-
- if (auto EC = sys::fs::closeFile(FD))
- return errorCodeToError(EC);
-
- NewArchiveMember M;
- M.Buf = std::move(*MemberBufferOrErr);
- M.MemberName = M.Buf->getBufferIdentifier();
- if (!Deterministic) {
- M.ModTime = std::chrono::time_point_cast<std::chrono::seconds>(
- Status.getLastModificationTime());
- M.UID = Status.getUser();
- M.GID = Status.getGroup();
- M.Perms = Status.permissions();
- }
- return std::move(M);
-}
-
-template <typename T>
-static void printWithSpacePadding(raw_ostream &OS, T Data, unsigned Size) {
- uint64_t OldPos = OS.tell();
- OS << Data;
- unsigned SizeSoFar = OS.tell() - OldPos;
- assert(SizeSoFar <= Size && "Data doesn't fit in Size");
- OS.indent(Size - SizeSoFar);
-}
-
-static bool isDarwin(object::Archive::Kind Kind) {
- return Kind == object::Archive::K_DARWIN ||
- Kind == object::Archive::K_DARWIN64;
-}
-
-static bool isBSDLike(object::Archive::Kind Kind) {
- switch (Kind) {
- case object::Archive::K_GNU:
- case object::Archive::K_GNU64:
- return false;
- case object::Archive::K_BSD:
- case object::Archive::K_DARWIN:
- case object::Archive::K_DARWIN64:
- return true;
- case object::Archive::K_COFF:
- break;
- }
- llvm_unreachable("not supported for writting");
-}
-
-template <class T>
-static void print(raw_ostream &Out, object::Archive::Kind Kind, T Val) {
- support::endian::write(Out, Val,
- isBSDLike(Kind) ? support::little : support::big);
-}
-
-static void printRestOfMemberHeader(
- raw_ostream &Out, const sys::TimePoint<std::chrono::seconds> &ModTime,
- unsigned UID, unsigned GID, unsigned Perms, unsigned Size) {
- printWithSpacePadding(Out, sys::toTimeT(ModTime), 12);
-
- // The format has only 6 chars for uid and gid. Truncate if the provided
- // values don't fit.
- printWithSpacePadding(Out, UID % 1000000, 6);
- printWithSpacePadding(Out, GID % 1000000, 6);
-
- printWithSpacePadding(Out, format("%o", Perms), 8);
- printWithSpacePadding(Out, Size, 10);
- Out << "`\n";
-}
-
-static void
-printGNUSmallMemberHeader(raw_ostream &Out, StringRef Name,
- const sys::TimePoint<std::chrono::seconds> &ModTime,
- unsigned UID, unsigned GID, unsigned Perms,
- unsigned Size) {
- printWithSpacePadding(Out, Twine(Name) + "/", 16);
- printRestOfMemberHeader(Out, ModTime, UID, GID, Perms, Size);
-}
-
-static void
-printBSDMemberHeader(raw_ostream &Out, uint64_t Pos, StringRef Name,
- const sys::TimePoint<std::chrono::seconds> &ModTime,
- unsigned UID, unsigned GID, unsigned Perms,
- unsigned Size) {
- uint64_t PosAfterHeader = Pos + 60 + Name.size();
- // Pad so that even 64 bit object files are aligned.
- unsigned Pad = OffsetToAlignment(PosAfterHeader, 8);
- unsigned NameWithPadding = Name.size() + Pad;
- printWithSpacePadding(Out, Twine("#1/") + Twine(NameWithPadding), 16);
- printRestOfMemberHeader(Out, ModTime, UID, GID, Perms,
- NameWithPadding + Size);
- Out << Name;
- while (Pad--)
- Out.write(uint8_t(0));
-}
-
-static bool useStringTable(bool Thin, StringRef Name) {
- return Thin || Name.size() >= 16 || Name.contains('/');
-}
-
-static bool is64BitKind(object::Archive::Kind Kind) {
- switch (Kind) {
- case object::Archive::K_GNU:
- case object::Archive::K_BSD:
- case object::Archive::K_DARWIN:
- case object::Archive::K_COFF:
- return false;
- case object::Archive::K_DARWIN64:
- case object::Archive::K_GNU64:
- return true;
- }
- llvm_unreachable("not supported for writting");
-}
-
-static void
-printMemberHeader(raw_ostream &Out, uint64_t Pos, raw_ostream &StringTable,
- StringMap<uint64_t> &MemberNames, object::Archive::Kind Kind,
- bool Thin, const NewArchiveMember &M,
- sys::TimePoint<std::chrono::seconds> ModTime, unsigned Size) {
- if (isBSDLike(Kind))
- return printBSDMemberHeader(Out, Pos, M.MemberName, ModTime, M.UID, M.GID,
- M.Perms, Size);
- if (!useStringTable(Thin, M.MemberName))
- return printGNUSmallMemberHeader(Out, M.MemberName, ModTime, M.UID, M.GID,
- M.Perms, Size);
- Out << '/';
- uint64_t NamePos;
- if (Thin) {
- NamePos = StringTable.tell();
- StringTable << M.MemberName << "/\n";
- } else {
- auto Insertion = MemberNames.insert({M.MemberName, uint64_t(0)});
- if (Insertion.second) {
- Insertion.first->second = StringTable.tell();
- StringTable << M.MemberName << "/\n";
- }
- NamePos = Insertion.first->second;
- }
- printWithSpacePadding(Out, NamePos, 15);
- printRestOfMemberHeader(Out, ModTime, M.UID, M.GID, M.Perms, Size);
-}
-
-namespace {
-struct MemberData {
- std::vector<unsigned> Symbols;
- std::string Header;
- StringRef Data;
- StringRef Padding;
-};
-} // namespace
-
-static MemberData computeStringTable(StringRef Names) {
- unsigned Size = Names.size();
- unsigned Pad = OffsetToAlignment(Size, 2);
- std::string Header;
- raw_string_ostream Out(Header);
- printWithSpacePadding(Out, "//", 48);
- printWithSpacePadding(Out, Size + Pad, 10);
- Out << "`\n";
- Out.flush();
- return {{}, std::move(Header), Names, Pad ? "\n" : ""};
-}
-
-static sys::TimePoint<std::chrono::seconds> now(bool Deterministic) {
- using namespace std::chrono;
-
- if (!Deterministic)
- return time_point_cast<seconds>(system_clock::now());
- return sys::TimePoint<seconds>();
-}
-
-static bool isArchiveSymbol(const object::BasicSymbolRef &S) {
- uint32_t Symflags = S.getFlags();
- if (Symflags & object::SymbolRef::SF_FormatSpecific)
- return false;
- if (!(Symflags & object::SymbolRef::SF_Global))
- return false;
- if (Symflags & object::SymbolRef::SF_Undefined)
- return false;
- return true;
-}
-
-static void printNBits(raw_ostream &Out, object::Archive::Kind Kind,
- uint64_t Val) {
- if (is64BitKind(Kind))
- print<uint64_t>(Out, Kind, Val);
- else
- print<uint32_t>(Out, Kind, Val);
-}
-
-static void writeSymbolTable(raw_ostream &Out, object::Archive::Kind Kind,
- bool Deterministic, ArrayRef<MemberData> Members,
- StringRef StringTable) {
- // We don't write a symbol table on an archive with no members -- except on
- // Darwin, where the linker will abort unless the archive has a symbol table.
- if (StringTable.empty() && !isDarwin(Kind))
- return;
-
- unsigned NumSyms = 0;
- for (const MemberData &M : Members)
- NumSyms += M.Symbols.size();
-
- unsigned Size = 0;
- unsigned OffsetSize = is64BitKind(Kind) ? sizeof(uint64_t) : sizeof(uint32_t);
-
- Size += OffsetSize; // Number of entries
- if (isBSDLike(Kind))
- Size += NumSyms * OffsetSize * 2; // Table
- else
- Size += NumSyms * OffsetSize; // Table
- if (isBSDLike(Kind))
- Size += OffsetSize; // byte count
- Size += StringTable.size();
- // ld64 expects the members to be 8-byte aligned for 64-bit content and at
- // least 4-byte aligned for 32-bit content. Opt for the larger encoding
- // uniformly.
- // We do this for all bsd formats because it simplifies aligning members.
- unsigned Alignment = isBSDLike(Kind) ? 8 : 2;
- unsigned Pad = OffsetToAlignment(Size, Alignment);
- Size += Pad;
-
- if (isBSDLike(Kind)) {
- const char *Name = is64BitKind(Kind) ? "__.SYMDEF_64" : "__.SYMDEF";
- printBSDMemberHeader(Out, Out.tell(), Name, now(Deterministic), 0, 0, 0,
- Size);
- } else {
- const char *Name = is64BitKind(Kind) ? "/SYM64" : "";
- printGNUSmallMemberHeader(Out, Name, now(Deterministic), 0, 0, 0, Size);
- }
-
- uint64_t Pos = Out.tell() + Size;
-
- if (isBSDLike(Kind))
- printNBits(Out, Kind, NumSyms * 2 * OffsetSize);
- else
- printNBits(Out, Kind, NumSyms);
-
- for (const MemberData &M : Members) {
- for (unsigned StringOffset : M.Symbols) {
- if (isBSDLike(Kind))
- printNBits(Out, Kind, StringOffset);
- printNBits(Out, Kind, Pos); // member offset
- }
- Pos += M.Header.size() + M.Data.size() + M.Padding.size();
- }
-
- if (isBSDLike(Kind))
- // byte count of the string table
- printNBits(Out, Kind, StringTable.size());
- Out << StringTable;
-
- while (Pad--)
- Out.write(uint8_t(0));
-}
-
-static Expected<std::vector<unsigned>>
-getSymbols(MemoryBufferRef Buf, raw_ostream &SymNames, bool &HasObject) {
- std::vector<unsigned> Ret;
-
- // In the scenario when LLVMContext is populated SymbolicFile will contain a
- // reference to it, thus SymbolicFile should be destroyed first.
- LLVMContext Context;
- std::unique_ptr<object::SymbolicFile> Obj;
- if (identify_magic(Buf.getBuffer()) == file_magic::bitcode) {
- auto ObjOrErr = object::SymbolicFile::createSymbolicFile(
- Buf, file_magic::bitcode, &Context);
- if (!ObjOrErr) {
- // FIXME: check only for "not an object file" errors.
- consumeError(ObjOrErr.takeError());
- return Ret;
- }
- Obj = std::move(*ObjOrErr);
- } else {
- auto ObjOrErr = object::SymbolicFile::createSymbolicFile(Buf);
- if (!ObjOrErr) {
- // FIXME: check only for "not an object file" errors.
- consumeError(ObjOrErr.takeError());
- return Ret;
- }
- Obj = std::move(*ObjOrErr);
- }
-
- HasObject = true;
- for (const object::BasicSymbolRef &S : Obj->symbols()) {
- if (!isArchiveSymbol(S))
- continue;
- Ret.push_back(SymNames.tell());
- if (Error E = S.printName(SymNames))
- return std::move(E);
- SymNames << '\0';
- }
- return Ret;
-}
-
-static Expected<std::vector<MemberData>>
-computeMemberData(raw_ostream &StringTable, raw_ostream &SymNames,
- object::Archive::Kind Kind, bool Thin, bool Deterministic,
- ArrayRef<NewArchiveMember> NewMembers) {
- static char PaddingData[8] = {'\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n'};
-
- // This ignores the symbol table, but we only need the value mod 8 and the
- // symbol table is aligned to be a multiple of 8 bytes
- uint64_t Pos = 0;
-
- std::vector<MemberData> Ret;
- bool HasObject = false;
-
- // Deduplicate long member names in the string table and reuse earlier name
- // offsets. This especially saves space for COFF Import libraries where all
- // members have the same name.
- StringMap<uint64_t> MemberNames;
-
- // UniqueTimestamps is a special case to improve debugging on Darwin:
- //
- // The Darwin linker does not link debug info into the final
- // binary. Instead, it emits entries of type N_OSO in in the output
- // binary's symbol table, containing references to the linked-in
- // object files. Using that reference, the debugger can read the
- // debug data directly from the object files. Alternatively, an
- // invocation of 'dsymutil' will link the debug data from the object
- // files into a dSYM bundle, which can be loaded by the debugger,
- // instead of the object files.
- //
- // For an object file, the N_OSO entries contain the absolute path
- // path to the file, and the file's timestamp. For an object
- // included in an archive, the path is formatted like
- // "/absolute/path/to/archive.a(member.o)", and the timestamp is the
- // archive member's timestamp, rather than the archive's timestamp.
- //
- // However, this doesn't always uniquely identify an object within
- // an archive -- an archive file can have multiple entries with the
- // same filename. (This will happen commonly if the original object
- // files started in different directories.) The only way they get
- // distinguished, then, is via the timestamp. But this process is
- // unable to find the correct object file in the archive when there
- // are two files of the same name and timestamp.
- //
- // Additionally, timestamp==0 is treated specially, and causes the
- // timestamp to be ignored as a match criteria.
- //
- // That will "usually" work out okay when creating an archive not in
- // deterministic timestamp mode, because the objects will probably
- // have been created at different timestamps.
- //
- // To ameliorate this problem, in deterministic archive mode (which
- // is the default), on Darwin we will emit a unique non-zero
- // timestamp for each entry with a duplicated name. This is still
- // deterministic: the only thing affecting that timestamp is the
- // order of the files in the resultant archive.
- //
- // See also the functions that handle the lookup:
- // in lldb: ObjectContainerBSDArchive::Archive::FindObject()
- // in llvm/tools/dsymutil: BinaryHolder::GetArchiveMemberBuffers().
- bool UniqueTimestamps = Deterministic && isDarwin(Kind);
- std::map<StringRef, unsigned> FilenameCount;
- if (UniqueTimestamps) {
- for (const NewArchiveMember &M : NewMembers)
- FilenameCount[M.MemberName]++;
- for (auto &Entry : FilenameCount)
- Entry.second = Entry.second > 1 ? 1 : 0;
- }
-
- for (const NewArchiveMember &M : NewMembers) {
- std::string Header;
- raw_string_ostream Out(Header);
-
- MemoryBufferRef Buf = M.Buf->getMemBufferRef();
- StringRef Data = Thin ? "" : Buf.getBuffer();
-
- // ld64 expects the members to be 8-byte aligned for 64-bit content and at
- // least 4-byte aligned for 32-bit content. Opt for the larger encoding
- // uniformly. This matches the behaviour with cctools and ensures that ld64
- // is happy with archives that we generate.
- unsigned MemberPadding =
- isDarwin(Kind) ? OffsetToAlignment(Data.size(), 8) : 0;
- unsigned TailPadding = OffsetToAlignment(Data.size() + MemberPadding, 2);
- StringRef Padding = StringRef(PaddingData, MemberPadding + TailPadding);
-
- sys::TimePoint<std::chrono::seconds> ModTime;
- if (UniqueTimestamps)
- // Increment timestamp for each file of a given name.
- ModTime = sys::toTimePoint(FilenameCount[M.MemberName]++);
- else
- ModTime = M.ModTime;
- printMemberHeader(Out, Pos, StringTable, MemberNames, Kind, Thin, M,
- ModTime, Buf.getBufferSize() + MemberPadding);
- Out.flush();
-
- Expected<std::vector<unsigned>> Symbols =
- getSymbols(Buf, SymNames, HasObject);
- if (auto E = Symbols.takeError())
- return std::move(E);
-
- Pos += Header.size() + Data.size() + Padding.size();
- Ret.push_back({std::move(*Symbols), std::move(Header), Data, Padding});
- }
- // If there are no symbols, emit an empty symbol table, to satisfy Solaris
- // tools, older versions of which expect a symbol table in a non-empty
- // archive, regardless of whether there are any symbols in it.
- if (HasObject && SymNames.tell() == 0)
- SymNames << '\0' << '\0' << '\0';
- return Ret;
-}
-
-namespace llvm {
-
-static ErrorOr<SmallString<128>> canonicalizePath(StringRef P) {
- SmallString<128> Ret = P;
- std::error_code Err = sys::fs::make_absolute(Ret);
- if (Err)
- return Err;
- sys::path::remove_dots(Ret, /*removedotdot*/ true);
- return Ret;
-}
-
-// Compute the relative path from From to To.
-Expected<std::string> computeArchiveRelativePath(StringRef From, StringRef To) {
- ErrorOr<SmallString<128>> PathToOrErr = canonicalizePath(To);
- ErrorOr<SmallString<128>> DirFromOrErr = canonicalizePath(From);
- if (!PathToOrErr || !DirFromOrErr)
- return errorCodeToError(std::error_code(errno, std::generic_category()));
-
- const SmallString<128> &PathTo = *PathToOrErr;
- const SmallString<128> &DirFrom = sys::path::parent_path(*DirFromOrErr);
-
- // Can't construct a relative path between different roots
- if (sys::path::root_name(PathTo) != sys::path::root_name(DirFrom))
- return sys::path::convert_to_slash(PathTo);
-
- // Skip common prefixes
- auto FromTo =
- std::mismatch(sys::path::begin(DirFrom), sys::path::end(DirFrom),
- sys::path::begin(PathTo));
- auto FromI = FromTo.first;
- auto ToI = FromTo.second;
-
- // Construct relative path
- SmallString<128> Relative;
- for (auto FromE = sys::path::end(DirFrom); FromI != FromE; ++FromI)
- sys::path::append(Relative, sys::path::Style::posix, "..");
-
- for (auto ToE = sys::path::end(PathTo); ToI != ToE; ++ToI)
- sys::path::append(Relative, sys::path::Style::posix, *ToI);
-
- return Relative.str();
-}
-
-Error writeArchive(StringRef ArcName, ArrayRef<NewArchiveMember> NewMembers,
- bool WriteSymtab, object::Archive::Kind Kind,
- bool Deterministic, bool Thin,
- std::unique_ptr<MemoryBuffer> OldArchiveBuf) {
- assert((!Thin || !isBSDLike(Kind)) && "Only the gnu format has a thin mode");
-
- SmallString<0> SymNamesBuf;
- raw_svector_ostream SymNames(SymNamesBuf);
- SmallString<0> StringTableBuf;
- raw_svector_ostream StringTable(StringTableBuf);
-
- Expected<std::vector<MemberData>> DataOrErr = computeMemberData(
- StringTable, SymNames, Kind, Thin, Deterministic, NewMembers);
- if (Error E = DataOrErr.takeError())
- return E;
- std::vector<MemberData> &Data = *DataOrErr;
-
- if (!StringTableBuf.empty())
- Data.insert(Data.begin(), computeStringTable(StringTableBuf));
-
- // We would like to detect if we need to switch to a 64-bit symbol table.
- if (WriteSymtab) {
- uint64_t MaxOffset = 0;
- uint64_t LastOffset = MaxOffset;
- for (const auto &M : Data) {
- // Record the start of the member's offset
- LastOffset = MaxOffset;
- // Account for the size of each part associated with the member.
- MaxOffset += M.Header.size() + M.Data.size() + M.Padding.size();
- // We assume 32-bit symbols to see if 32-bit symbols are possible or not.
- MaxOffset += M.Symbols.size() * 4;
- }
-
- // The SYM64 format is used when an archive's member offsets are larger than
- // 32-bits can hold. The need for this shift in format is detected by
- // writeArchive. To test this we need to generate a file with a member that
- // has an offset larger than 32-bits but this demands a very slow test. To
- // speed the test up we use this environment variable to pretend like the
- // cutoff happens before 32-bits and instead happens at some much smaller
- // value.
- const char *Sym64Env = std::getenv("SYM64_THRESHOLD");
- int Sym64Threshold = 32;
- if (Sym64Env)
- StringRef(Sym64Env).getAsInteger(10, Sym64Threshold);
-
- // If LastOffset isn't going to fit in a 32-bit varible we need to switch
- // to 64-bit. Note that the file can be larger than 4GB as long as the last
- // member starts before the 4GB offset.
- if (LastOffset >= (1ULL << Sym64Threshold)) {
- if (Kind == object::Archive::K_DARWIN)
- Kind = object::Archive::K_DARWIN64;
- else
- Kind = object::Archive::K_GNU64;
- }
- }
-
- Expected<sys::fs::TempFile> Temp =
- sys::fs::TempFile::create(ArcName + ".temp-archive-%%%%%%%.a");
- if (!Temp)
- return Temp.takeError();
-
- raw_fd_ostream Out(Temp->FD, false);
- if (Thin)
- Out << "!<thin>\n";
- else
- Out << "!<arch>\n";
-
- if (WriteSymtab)
- writeSymbolTable(Out, Kind, Deterministic, Data, SymNamesBuf);
-
- for (const MemberData &M : Data)
- Out << M.Header << M.Data << M.Padding;
-
- Out.flush();
-
- // At this point, we no longer need whatever backing memory
- // was used to generate the NewMembers. On Windows, this buffer
- // could be a mapped view of the file we want to replace (if
- // we're updating an existing archive, say). In that case, the
- // rename would still succeed, but it would leave behind a
- // temporary file (actually the original file renamed) because
- // a file cannot be deleted while there's a handle open on it,
- // only renamed. So by freeing this buffer, this ensures that
- // the last open handle on the destination file, if any, is
- // closed before we attempt to rename.
- OldArchiveBuf.reset();
-
- return Temp->keep(ArcName);
-}
-
-} // namespace llvm
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