1 //===-- Archive.cpp - Generic LLVM archive functions ------------*- 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 contains the implementation of the Archive and ArchiveMember
11 // classes that is common to both reading and writing archives..
13 //===----------------------------------------------------------------------===//
16 #include "ArchiveInternals.h"
17 #include "llvm/Bitcode/ReaderWriter.h"
18 #include "llvm/IR/Module.h"
19 #include "llvm/Support/FileSystem.h"
20 #include "llvm/Support/MemoryBuffer.h"
21 #include "llvm/Support/Process.h"
22 #include "llvm/Support/system_error.h"
27 // getMemberSize - compute the actual physical size of the file member as seen
28 // on disk. This isn't the size of member's payload. Use getSize() for that.
30 ArchiveMember::getMemberSize() const {
31 // Basically its the file size plus the header size
32 unsigned result = Size + sizeof(ArchiveMemberHeader);
34 // If it has a long filename, include the name length
35 if (hasLongFilename())
36 result += path.length() + 1;
38 // If its now odd lengthed, include the padding byte
45 // This default constructor is only use by the ilist when it creates its
46 // sentry node. We give it specific static values to make it stand out a bit.
47 ArchiveMember::ArchiveMember()
48 : parent(0), path("--invalid--"), flags(0), data(0)
50 User = sys::Process::GetCurrentUserId();
51 Group = sys::Process::GetCurrentGroupId();
54 ModTime = sys::TimeValue::now();
57 // This is the constructor that the Archive class uses when it is building or
58 // reading an archive. It just defaults a few things and ensures the parent is
59 // set for the iplist. The Archive class fills in the ArchiveMember's data.
60 // This is required because correctly setting the data may depend on other
61 // things in the Archive.
62 ArchiveMember::ArchiveMember(Archive* PAR)
63 : parent(PAR), path(), flags(0), data(0)
67 // This method allows an ArchiveMember to be replaced with the data for a
68 // different file, presumably as an update to the member. It also makes sure
69 // the flags are reset correctly.
70 bool ArchiveMember::replaceWith(StringRef newFile, std::string* ErrMsg) {
72 if (sys::fs::exists(newFile.str(), Exists) || !Exists) {
74 *ErrMsg = "Can not replace an archive member with a non-existent file";
81 // SVR4 symbol tables have an empty name
82 if (path == ARFILE_SVR4_SYMTAB_NAME)
83 flags |= SVR4SymbolTableFlag;
85 flags &= ~SVR4SymbolTableFlag;
87 // BSD4.4 symbol tables have a special name
88 if (path == ARFILE_BSD4_SYMTAB_NAME)
89 flags |= BSD4SymbolTableFlag;
91 flags &= ~BSD4SymbolTableFlag;
94 if (path == ARFILE_STRTAB_NAME)
95 flags |= StringTableFlag;
97 flags &= ~StringTableFlag;
99 // If it has a slash or its over 15 chars then its a long filename format
100 if (path.length() > 15)
101 flags |= HasLongFilenameFlag;
103 flags &= ~HasLongFilenameFlag;
105 // Get the signature and status info
106 const char* signature = (const char*) data;
107 SmallString<4> magic;
109 sys::fs::get_magic(path, magic.capacity(), magic);
110 signature = magic.c_str();
112 sys::fs::file_status Status;
113 error_code EC = sys::fs::status(path, Status);
117 User = Status.getUser();
118 Group = Status.getGroup();
119 Mode = Status.permissions();
120 ModTime = Status.getLastModificationTime();
122 // FIXME: On posix this is a second stat.
123 EC = sys::fs::file_size(path, Size);
131 // Archive constructor - this is the only constructor that gets used for the
132 // Archive class. Everything else (default,copy) is deprecated. This just
133 // initializes and maps the file into memory, if requested.
134 Archive::Archive(StringRef filename, LLVMContext &C)
135 : archPath(filename), members(), mapfile(0), base(0), strtab(),
136 firstFileOffset(0), modules(), Context(C) {}
139 Archive::mapToMemory(std::string* ErrMsg) {
140 OwningPtr<MemoryBuffer> File;
141 if (error_code ec = MemoryBuffer::getFile(archPath.c_str(), File)) {
143 *ErrMsg = ec.message();
146 mapfile = File.take();
147 base = mapfile->getBufferStart();
151 void Archive::cleanUpMemory() {
152 // Shutdown the file mapping
159 // Delete any Modules and ArchiveMember's we've allocated as a result of
160 // symbol table searches.
161 for (ModuleMap::iterator I=modules.begin(), E=modules.end(); I != E; ++I ) {
162 delete I->second.first;
163 delete I->second.second;
167 // Archive destructor - just clean up memory
168 Archive::~Archive() {