1//===- Archive.cpp --------------------------------------------------------===//
2//
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
6//
7//===----------------------------------------------------------------------===//
8
9#include "Archive.h"
10#include "llvm/ObjCopy/CommonConfig.h"
11#include "llvm/ObjCopy/MultiFormatConfig.h"
12#include "llvm/ObjCopy/ObjCopy.h"
13#include "llvm/Object/Error.h"
14#include "llvm/Object/MachO.h"
15#include "llvm/Support/FileOutputBuffer.h"
16#include "llvm/Support/SmallVectorMemoryBuffer.h"
17
18namespace llvm {
19namespace objcopy {
20
21using namespace llvm::object;
22
23Expected<std::vector<NewArchiveMember>>
24createNewArchiveMembers(const MultiFormatConfig &Config, const Archive &Ar) {
25 std::vector<NewArchiveMember> NewArchiveMembers;
26 Error Err = Error::success();
27 for (const Archive::Child &Child : Ar.children(Err)) {
28 Expected<StringRef> ChildNameOrErr = Child.getName();
29 if (!ChildNameOrErr)
30 return createFileError(F: Ar.getFileName(), E: ChildNameOrErr.takeError());
31
32 Expected<std::unique_ptr<Binary>> ChildOrErr = Child.getAsBinary();
33 if (!ChildOrErr)
34 return createFileError(F: Ar.getFileName() + "(" + *ChildNameOrErr + ")",
35 E: ChildOrErr.takeError());
36
37 SmallVector<char, 0> Buffer;
38 raw_svector_ostream MemStream(Buffer);
39
40 if (Error E = executeObjcopyOnBinary(Config, In&: *ChildOrErr->get(), Out&: MemStream))
41 return std::move(E);
42
43 Expected<NewArchiveMember> Member = NewArchiveMember::getOldMember(
44 OldMember: Child, Deterministic: Config.getCommonConfig().DeterministicArchives);
45 if (!Member)
46 return createFileError(F: Ar.getFileName(), E: Member.takeError());
47
48 Member->Buf = std::make_unique<SmallVectorMemoryBuffer>(
49 args: std::move(Buffer), args&: ChildNameOrErr.get());
50 Member->MemberName = Member->Buf->getBufferIdentifier();
51 NewArchiveMembers.push_back(x: std::move(*Member));
52 }
53 if (Err)
54 return createFileError(F: Config.getCommonConfig().InputFilename,
55 E: std::move(Err));
56 return std::move(NewArchiveMembers);
57}
58
59// For regular archives this function simply calls llvm::writeArchive,
60// For thin archives it writes the archive file itself as well as its members.
61static Error deepWriteArchive(StringRef ArcName,
62 ArrayRef<NewArchiveMember> NewMembers,
63 SymtabWritingMode WriteSymtab,
64 object::Archive::Kind Kind, bool Deterministic,
65 bool Thin) {
66 if (Kind == object::Archive::K_BSD && !NewMembers.empty() &&
67 NewMembers.front().detectKindFromObject() == object::Archive::K_DARWIN)
68 Kind = object::Archive::K_DARWIN;
69
70 if (Error E = writeArchive(ArcName, NewMembers, WriteSymtab, Kind,
71 Deterministic, Thin))
72 return createFileError(F: ArcName, E: std::move(E));
73
74 if (!Thin)
75 return Error::success();
76
77 for (const NewArchiveMember &Member : NewMembers) {
78 // For regular files (as is the case for deepWriteArchive),
79 // FileOutputBuffer::create will return OnDiskBuffer.
80 // OnDiskBuffer uses a temporary file and then renames it. So in reality
81 // there is no inefficiency / duplicated in-memory buffers in this case. For
82 // now in-memory buffers can not be completely avoided since
83 // NewArchiveMember still requires them even though writeArchive does not
84 // write them on disk.
85 Expected<std::unique_ptr<FileOutputBuffer>> FB =
86 FileOutputBuffer::create(FilePath: Member.MemberName, Size: Member.Buf->getBufferSize(),
87 Flags: FileOutputBuffer::F_executable);
88 if (!FB)
89 return FB.takeError();
90 std::copy(first: Member.Buf->getBufferStart(), last: Member.Buf->getBufferEnd(),
91 result: (*FB)->getBufferStart());
92 if (Error E = (*FB)->commit())
93 return E;
94 }
95 return Error::success();
96}
97
98Error executeObjcopyOnArchive(const MultiFormatConfig &Config,
99 const object::Archive &Ar) {
100 Expected<std::vector<NewArchiveMember>> NewArchiveMembersOrErr =
101 createNewArchiveMembers(Config, Ar);
102 if (!NewArchiveMembersOrErr)
103 return NewArchiveMembersOrErr.takeError();
104 const CommonConfig &CommonConfig = Config.getCommonConfig();
105 return deepWriteArchive(ArcName: CommonConfig.OutputFilename, NewMembers: *NewArchiveMembersOrErr,
106 WriteSymtab: Ar.hasSymbolTable() ? SymtabWritingMode::NormalSymtab
107 : SymtabWritingMode::NoSymtab,
108 Kind: Ar.kind(), Deterministic: CommonConfig.DeterministicArchives,
109 Thin: Ar.isThin());
110}
111
112} // end namespace objcopy
113} // end namespace llvm
114

source code of llvm/lib/ObjCopy/Archive.cpp