From ba09b3bf28e90d398d18359155d4776b003e1c34 Mon Sep 17 00:00:00 2001 From: Reid Spencer Date: Sun, 14 Nov 2004 21:56:59 +0000 Subject: [PATCH] First working version llvm-svn: 17765 --- llvm/lib/Bytecode/Archive/Archive.cpp | 130 +++- llvm/lib/Bytecode/Archive/ArchiveWriter.cpp | 624 ++++++++++++-------- 2 files changed, 511 insertions(+), 243 deletions(-) diff --git a/llvm/lib/Bytecode/Archive/Archive.cpp b/llvm/lib/Bytecode/Archive/Archive.cpp index e9fcd2ebe16d..b006e5a83d7c 100644 --- a/llvm/lib/Bytecode/Archive/Archive.cpp +++ b/llvm/lib/Bytecode/Archive/Archive.cpp @@ -7,18 +7,144 @@ // //===----------------------------------------------------------------------===// // -// Builds up standard unix archive files (.a) containing LLVM bytecode. +// This file contains the implementation of the Archive and ArchiveMember +// classes that is common to both reading and writing archives.. // //===----------------------------------------------------------------------===// #include "ArchiveInternals.h" +#include "llvm/ModuleProvider.h" using namespace llvm; -Archive::Archive() { +// getMemberSize - compute the actual physical size of the file member as seen +// on disk. This isn't the size of member's payload. Use getSize() for that. +unsigned +ArchiveMember::getMemberSize() const { + // Basically its the file size plus the header size + unsigned result = info.fileSize + sizeof(ArchiveMemberHeader); + + // If it has a long filename, include the name length + if (hasLongFilename()) + result += path.get().length() + 1; + + // If its now odd lengthed, include the padding byte + if (result % 2 != 0 ) + result++; + + return result; } +// This default constructor is only use by the ilist when it creates its +// sentry node. We give it specific static values to make it stand out a bit. +ArchiveMember::ArchiveMember() + : next(0), prev(0), parent(0), path(""), flags(0), data(0) +{ + info.user = 1000; + info.group = 1000; + info.mode = 0777; + info.fileSize = 0; + info.modTime = sys::TimeValue::now(); +} + +// This is the constructor that the Archive class uses when it is building or +// reading an archive. It just defaults a few things and ensures the parent is +// set for the iplist. The Archive class fills in the ArchiveMember's data. +// This is required because correctly setting the data may depend on other +// things in the Archive. +ArchiveMember::ArchiveMember(Archive* PAR) + : next(0), prev(0), parent(PAR), path(), flags(0), data(0) +{ +} + +// This method allows an ArchiveMember to be replaced with the data for a +// different file, presumably as an update to the member. It also makes sure +// the flags are reset correctly. +void ArchiveMember::replaceWith(const sys::Path& newFile) { + assert(newFile.exists() && "Can't replace with a non-existent file"); + data = 0; + path = newFile; + + // Foreign symbol tables have an empty name + if (path.get() == ARFILE_SYMTAB_NAME) + flags |= ForeignSymbolTableFlag; + else + flags &= ~ForeignSymbolTableFlag; + + // LLVM symbol tables have a very specific name + if (path.get() == ARFILE_LLVM_SYMTAB_NAME) + flags |= LLVMSymbolTableFlag; + else + flags &= ~LLVMSymbolTableFlag; + + // String table name + if (path.get() == ARFILE_STRTAB_NAME) + flags |= StringTableFlag; + else + flags &= ~StringTableFlag; + + // If it has a slash then it has a path + bool hasSlash = path.get().find('/') != std::string::npos; + if (hasSlash) + flags |= HasPathFlag; + else + flags &= ~HasPathFlag; + + // If it has a slash or its over 15 chars then its a long filename format + if (hasSlash || path.get().length() > 15) + flags |= HasLongFilenameFlag; + else + flags &= ~HasLongFilenameFlag; + + // Get the signature and status info + std::string magic; + const char* signature = (const char*) data; + if (!signature) { + path.getMagicNumber(magic,4); + signature = magic.c_str(); + path.getStatusInfo(info); + } + + // Determine what kind of file it is + switch (sys::IdentifyFileType(signature,4)) { + case sys::BytecodeFileType: + flags |= BytecodeFlag; + break; + case sys::CompressedBytecodeFileType: + flags |= CompressedBytecodeFlag; + flags &= ~CompressedFlag; + break; + default: + flags &= ~(BytecodeFlag|CompressedBytecodeFlag); + break; + } +} + +// Archive constructor - this is the only constructor that gets used for the +// Archive class. Everything else (default,copy) is deprecated. This just +// initializes and maps the file into memory, if requested. +Archive::Archive(const sys::Path& filename, bool map ) + : archPath(filename), members(), mapfile(0), base(0), symTab(), symTabSize(0) +{ + if (map) { + mapfile = new sys::MappedFile(filename); + base = (char*) mapfile->map(); + } +} + +// Archive destructor - just clean up memory Archive::~Archive() { + // Shutdown the file mapping + if (mapfile) { + mapfile->unmap(); + delete mapfile; + } + // Delete any ModuleProviders and ArchiveMember's we've allocated as a result + // of symbol table searches. + for (ModuleMap::iterator I=modules.begin(), E=modules.end(); I != E; ++I ) { + delete I->second.first; + delete I->second.second; + } } // vim: sw=2 ai diff --git a/llvm/lib/Bytecode/Archive/ArchiveWriter.cpp b/llvm/lib/Bytecode/Archive/ArchiveWriter.cpp index e3e2df4aee0d..727b2bfcdf41 100644 --- a/llvm/lib/Bytecode/Archive/ArchiveWriter.cpp +++ b/llvm/lib/Bytecode/Archive/ArchiveWriter.cpp @@ -1,284 +1,426 @@ -//===-- ArchiveWriter.cpp - LLVM archive writing --------------------------===// +//===-- ArchiveWriter.cpp - Write LLVM archive files ----------------------===// // // The LLVM Compiler Infrastructure // -// This file was developed by Reid Spencerand is distributed under the +// This file was developed by Reid Spencer and is distributed under the // University of Illinois Open Source License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // -// Builds up standard unix archive files (.a) containing LLVM bytecode. +// Builds up an LLVM archive file (.a) containing LLVM bytecode. // //===----------------------------------------------------------------------===// #include "ArchiveInternals.h" -#include "llvm/Module.h" #include "llvm/Bytecode/Reader.h" #include "llvm/Support/FileUtilities.h" -#include "llvm/ADT/StringExtras.h" -#include "llvm/System/MappedFile.h" +#include "llvm/Support/Compressor.h" +#include "llvm/System/Signals.h" #include #include +#include using namespace llvm; +namespace { + +// Write an integer using variable bit rate encoding. This saves a few bytes +// per entry in the symbol table. +inline void writeInteger(unsigned num, std::ofstream& ARFile) { + while (1) { + if (num < 0x80) { // done? + ARFile << (unsigned char)num; + return; + } + + // Nope, we are bigger than a character, output the next 7 bits and set the + // high bit to say that there is more coming... + ARFile << (unsigned char)(0x80 | ((unsigned char)num & 0x7F)); + num >>= 7; // Shift out 7 bits now... + } +} + +// Compute how many bytes are taken by a given VBR encoded value. This is needed +// to pre-compute the size of the symbol table. +inline unsigned numVbrBytes(unsigned num) { + if (num < 128) // 2^7 + return 1; + if (num < 16384) // 2^14 + return 2; + if (num < 2097152) // 2^21 + return 3; + if (num < 268435456) // 2^28 + return 4; + return 5; // anything >= 2^28 takes 5 bytes +} + +} + +// Create an empty archive. Archive* -Archive::CreateEmpty(const sys::Path& Filename) { - Archive* result = new Archive; - Archive::ArchiveInternals* impl = result->impl = new Archive::ArchiveInternals; - impl->fname = Filename; +Archive::CreateEmpty(const sys::Path& FilePath ) { + Archive* result = new Archive(FilePath,false); return result; } -Archive* -Archive::CreateFromFiles( - const sys::Path& Filename, - const PathList& Files, - const std::string& StripName -) { - Archive* result = new Archive; - Archive::ArchiveInternals* impl = result->impl = new Archive::ArchiveInternals; - impl->fname = Filename; +bool +Archive::fillHeader(const ArchiveMember &mbr, ArchiveMemberHeader& hdr, + int sz, bool TruncateNames) const { - try { - size_t strip_len = StripName.length(); - for (PathList::const_iterator P = Files.begin(), E = Files.end(); P != E ;++P) - { - if (P->readable()) { - std::string name(P->get()); - if (strip_len > 0 && StripName == name.substr(0,strip_len)) { - name.erase(0,strip_len); - } - if (P->isBytecodeFile()) { - std::vector syms; - if (!GetBytecodeSymbols(*P, syms)) - throw std::string("Can not get symbols from: ") + P->get(); - impl->addFileMember(*P, name, &syms); - } else { - impl->addFileMember(*P, name); - } + // Set the permissions mode, uid and gid + hdr.init(); + char buffer[32]; + sprintf(buffer, "%-8o", mbr.getMode()); + memcpy(hdr.mode,buffer,8); + sprintf(buffer, "%-6u", mbr.getUser()); + memcpy(hdr.uid,buffer,6); + sprintf(buffer, "%-6u", mbr.getGroup()); + memcpy(hdr.gid,buffer,6); + + // Set the size field + if (sz < 0 ) { + buffer[0] = '-'; + sprintf(&buffer[1],"%-9u",(unsigned)-sz); + } else { + sprintf(buffer, "%-10u", (unsigned)sz); + } + memcpy(hdr.size,buffer,10); + + // Set the last modification date + uint64_t secondsSinceEpoch = mbr.getModTime().toEpochTime(); + sprintf(buffer,"%-12u", unsigned(secondsSinceEpoch)); + memcpy(hdr.date,buffer,12); + + // Set the name field in one of its various flavors. + bool writeLongName = false; + const std::string& mbrPath = mbr.getPath().get(); + if (mbr.isStringTable()) { + memcpy(hdr.name,ARFILE_STRTAB_NAME,16); + } else if (mbr.isForeignSymbolTable()) { + memcpy(hdr.name,ARFILE_SYMTAB_NAME,16); + } else if (mbr.isLLVMSymbolTable()) { + memcpy(hdr.name,ARFILE_LLVM_SYMTAB_NAME,16); + } else if (TruncateNames) { + const char* nm = mbrPath.c_str(); + unsigned len = mbrPath.length(); + size_t slashpos = mbrPath.rfind('/'); + if (slashpos != std::string::npos) { + nm += slashpos + 1; + len -= slashpos +1; + } + if (len >15) + len = 15; + mbrPath.copy(hdr.name,len); + hdr.name[len] = '/'; + } else if (mbrPath.length() < 16 && mbrPath.find('/') == std::string::npos) { + mbrPath.copy(hdr.name,mbrPath.length()); + hdr.name[mbrPath.length()] = '/'; + } else { + std::string nm = "#1/"; + nm += utostr(mbrPath.length()); + nm.copy(hdr.name,nm.length()); + writeLongName = true; + } + return writeLongName; +} + +void +Archive::addFileBefore(const sys::Path& filePath, iterator where) { + assert(filePath.exists() && "Can't add a non-existent file"); + + ArchiveMember* mbr = new ArchiveMember(this); + + mbr->data = 0; + mbr->path = filePath; + mbr->path.getStatusInfo(mbr->info); + + unsigned flags = 0; + bool hasSlash = filePath.get().find('/') != std::string::npos; + if (hasSlash) + flags |= ArchiveMember::HasPathFlag; + if (hasSlash || filePath.get().length() > 15) + flags |= ArchiveMember::HasLongFilenameFlag; + std::string magic; + mbr->path.getMagicNumber(magic,4); + switch (sys::IdentifyFileType(magic.c_str(),4)) { + case sys::BytecodeFileType: + flags |= ArchiveMember::BytecodeFlag; + break; + case sys::CompressedBytecodeFileType: + flags |= ArchiveMember::CompressedBytecodeFlag; + break; + default: + break; + } + mbr->flags = flags; + members.insert(where,mbr); +} + +void +Archive::moveMemberBefore(iterator target, iterator where) { + assert(target != end() && "Target iterator for moveMemberBefore is invalid"); + ArchiveMember* mbr = members.remove(target); + members.insert(where, mbr); +} + +void +Archive::remove(iterator target) { + assert(target != end() && "Target iterator for remove is invalid"); + ArchiveMember* mbr = members.remove(target); + delete mbr; +} +void +Archive::writeMember( + const ArchiveMember& member, + std::ofstream& ARFile, + bool CreateSymbolTable, + bool TruncateNames, + bool ShouldCompress +) { + + unsigned filepos = ARFile.tellp(); + filepos -= 8; + + // Get the data and its size either from the + // member's in-memory data or directly from the file. + size_t fSize = member.getSize(); + const char* data = (const char*)member.getData(); + sys::MappedFile* mFile = 0; + if (!data) { + mFile = new sys::MappedFile(member.getPath()); + data = (const char*) mFile->map(); + fSize = mFile->size(); + } + + // Now that we have the data in memory, update the + // symbol table if its a bytecode file. + if (CreateSymbolTable && + (member.isBytecode() || member.isCompressedBytecode())) { + std::vector symbols; + GetBytecodeSymbols((const unsigned char*)data,fSize,member.getPath().get(), + symbols); + for (std::vector::iterator SI = symbols.begin(), + SE = symbols.end(); SI != SE; ++SI) { + + std::pair Res = + symTab.insert(std::make_pair(*SI,filepos)); + + if (Res.second) { + symTabSize += SI->length() + + numVbrBytes(SI->length()) + + numVbrBytes(filepos); } - else - throw std::string("Can not read: ") + P->get(); - } - - // Now that we've collected everything, write the archive - impl->writeArchive(); - - } catch(...) { - delete impl; - result->impl = 0; - delete result; - throw; - } - - return result; -} - -void -Archive::ArchiveInternals::addFileMember( - const sys::Path& filePath, - const std::string& memberName, - const StrTab* symbols -) { - MemberInfo info; - info.path = filePath; - info.name = memberName; - filePath.getStatusInfo(info.status); - if (symbols) - info.symbols = *symbols; - info.offset = 0; - members.push_back(info); -} - -void -Archive::ArchiveInternals::writeInteger(int num, std::ofstream& ARFile) { - char buff[4]; - buff[0] = (num >> 24) & 255; - buff[1] = (num >> 16) & 255; - buff[2] = (num >> 8) & 255; - buff[3] = num & 255; - ARFile.write(buff, sizeof(buff)); -} - -void -Archive::ArchiveInternals::writeSymbolTable( std::ofstream& ARFile ) { - - // Compute the number of symbols in the symbol table and the - // total byte size of the string pool. While we're traversing, - // build the string pool for supporting long file names. Also, - // build the table of file offsets for the symbol table and - // the - typedef std::map SymbolMap; - StrTab stringPool; - SymbolMap symbolTable; - std::vector fileOffsets; - std::string symTabStrings; - unsigned fileOffset = 0; - unsigned spOffset = 0; - unsigned numSymbols = 0; - unsigned numSymBytes = 0; - for (unsigned i = 0; i < members.size(); i++ ) { - MemberInfo& mi = members[i]; - StrTab& syms = mi.symbols; - size_t numSym = syms.size(); - numSymbols += numSym; - for (unsigned j = 0; j < numSym; j++ ) { - numSymBytes += syms[j].size() + 1; - symbolTable[syms[i]] = i; - } - if (mi.name.length() > 15 || std::string::npos != mi.name.find('/')) { - stringPool.push_back(mi.name + "/\n"); - mi.name = std::string("/") + utostr(spOffset); - spOffset += mi.name.length() + 2; - } else if (mi.name[mi.name.length()-1] != '/') { - mi.name += "/"; - } - fileOffsets.push_back(fileOffset); - fileOffset += sizeof(ArchiveMemberHeader) + mi.status.fileSize; - } - - - // Compute the size of the symbol table file member - unsigned symTabSize = 0; - if (numSymbols != 0) - symTabSize = - sizeof(ArchiveMemberHeader) + // Size of the file header - 4 + // Size of "number of entries" - (4 * numSymbols) + // Size of member file indices - numSymBytes; // Size of the string table - - // Compute the size of the string pool - unsigned strPoolSize = 0; - if (spOffset != 0 ) - strPoolSize = - sizeof(ArchiveMemberHeader) + // Size of the file header - spOffset; // Number of bytes in the string pool - - // Compute the byte index offset created by symbol table and string pool - unsigned firstFileOffset = symTabSize + strPoolSize; - - // Create header for symbol table. This must be first if there is - // a symbol table and must have a special name. - if ( symTabSize > 0 ) { - ArchiveMemberHeader Hdr; - Hdr.init(); - - // Name of symbol table is '/ ' but "" is passed in - // because the setName method always terminates with a / - Hdr.setName(ARFILE_SYMTAB_NAME); - Hdr.setDate(); - Hdr.setSize(symTabSize - sizeof(ArchiveMemberHeader)); - Hdr.setMode(0); - Hdr.setUid(0); - Hdr.setGid(0); - - // Write header to archive file - ARFile.write((char*)&Hdr, sizeof(Hdr)); - - // Write the number of entries in the symbol table - this->writeInteger(numSymbols, ARFile); - - // Write the file offset indices for each symbol and build the - // symbol table string pool - std::string symTabStrPool; - symTabStrPool.reserve(256 * 1024); // Reserve 256KBytes for symbols - for (SymbolMap::iterator I = symbolTable.begin(), E = symbolTable.end(); - I != E; ++I ) { - this->writeInteger(firstFileOffset + fileOffsets[I->second], ARFile); - symTabStrPool += I->first; - symTabStrPool += "\0"; - } - - // Write the symbol table's string pool - ARFile.write(symTabStrPool.data(), symTabStrPool.size()); - } - - //============== DONE WITH SYMBOL TABLE - - if (strPoolSize > 0) { - // Initialize the header for the string pool - ArchiveMemberHeader Hdr; - Hdr.init(); - Hdr.setName(ARFILE_STRTAB_NAME); - Hdr.setDate(); - Hdr.setSize(spOffset); - Hdr.setMode(0); - Hdr.setUid(0); - Hdr.setGid(0); - - // Write the string pool header - ARFile.write((char*)&Hdr, sizeof(Hdr)); - - // Write the string pool - for (unsigned i = 0; i < stringPool.size(); i++) { - ARFile.write(stringPool[i].data(), stringPool[i].size()); } } -} -void -Archive::ArchiveInternals::writeMember( - const MemberInfo& member, - std::ofstream& ARFile -) { + // Determine if we actually should compress this member + bool willCompress = + (ShouldCompress && + !member.isForeignSymbolTable() && + !member.isLLVMSymbolTable() && + !member.isCompressed() && + !member.isCompressedBytecode()); - // Map the file into memory. We do this early for two reasons. First, - // if there's any kind of error, we want to know about it. Second, we - // want to ensure we're using the most recent size for this file. - sys::MappedFile mFile(member.path); - mFile.map(); + // Perform the compression. Note that if the file is uncompressed bytecode + // then we turn the file into compressed bytecode rather than treating it as + // compressed data. This is necessary since it allows us to determine that the + // file contains bytecode instead of looking like a regular compressed data + // member. A compressed bytecode file has its content compressed but has a + // magic number of "llvc". This acounts for the +/-4 arithmetic in the code + // below. + int hdrSize; + if (willCompress) { + char* output = 0; + if (member.isBytecode()) { + data +=4; + fSize -= 4; + } + fSize = Compressor::compressToNewBuffer( + data,fSize,output,Compressor::COMP_TYPE_ZLIB); + data = output; + if (member.isBytecode()) + hdrSize = -fSize-4; + else + hdrSize = -fSize; + } else { + hdrSize = fSize; + } - // Header for the archive member + // Compute the fields of the header ArchiveMemberHeader Hdr; - Hdr.init(); - - // Set the name. If its longer than 15 chars, it will have already - // been reduced by the writeSymbolTable. - Hdr.setName(member.name); - - // Set the other header members - Hdr.setSize( mFile.size() ); - Hdr.setMode( member.status.mode); - Hdr.setUid ( member.status.user); - Hdr.setGid ( member.status.group); - Hdr.setDate( member.status.modTime.ToPosixTime() ); + bool writeLongName = fillHeader(member,Hdr,hdrSize,TruncateNames); // Write header to archive file ARFile.write((char*)&Hdr, sizeof(Hdr)); - - //write to archive file - ARFile.write(mFile.charBase(),mFile.size()); - mFile.unmap(); + // Write the long filename if its long + if (writeLongName) { + ARFile << member.getPath().c_str(); + ARFile << '\n'; + } + + // Make sure we write the compressed bytecode magic number if we should. + if (willCompress && member.isBytecode()) + ARFile.write("llvc",4); + + // Write the (possibly compressed) member's content to the file. + ARFile.write(data,fSize); + + // Make sure the member is an even length + if (ARFile.tellp() % 2 != 0) + ARFile << ARFILE_PAD; + + // Free the compressed data, if necessary + if (willCompress) { + free((void*)data); + } + + // Close the mapped file if it was opened + if (mFile != 0) { + mFile->unmap(); + delete mFile; + } } void -Archive::ArchiveInternals::writeArchive() { - - // Create archive file for output. - std::ofstream ArchiveFile(fname.get().c_str()); - - // Check for errors opening or creating archive file. - if ( !ArchiveFile.is_open() || ArchiveFile.bad() ) { - throw std::string("Error opening archive file: ") + fname.get(); +Archive::writeSymbolTable(std::ofstream& ARFile,bool PrintSymTab ) { + + // Construct the symbol table's header + ArchiveMemberHeader Hdr; + Hdr.init(); + memcpy(Hdr.name,ARFILE_LLVM_SYMTAB_NAME,16); + uint64_t secondsSinceEpoch = sys::TimeValue::now().toEpochTime(); + char buffer[32]; + sprintf(buffer,"%-12u", unsigned(secondsSinceEpoch)); + memcpy(Hdr.date,buffer,12); + sprintf(buffer,"%-10u",symTabSize); + memcpy(Hdr.size,buffer,10); + + // Write the header + ARFile.write((char*)&Hdr, sizeof(Hdr)); + + // Save the starting position of the symbol tables data content. + unsigned startpos = ARFile.tellp(); + + // Print the symbol table header if we're supposed to + if (PrintSymTab) + std::cout << "Symbol Table:\n"; + + // Write out the symbols sequentially + for ( Archive::SymTabType::iterator I = symTab.begin(), E = symTab.end(); + I != E; ++I) + { + // Write out the file index + writeInteger(I->second, ARFile); + // Write out the length of the symbol + writeInteger(I->first.length(), ARFile); + // Write out the symbol + ARFile.write(I->first.data(), I->first.length()); + + // Print this entry to std::cout if we should + if (PrintSymTab) { + unsigned filepos = I->second + symTabSize + sizeof(ArchiveMemberHeader) + + (symTabSize % 2 != 0) + 8; + std::cout << " " << std::setw(9) << filepos << "\t" << I->first << "\n"; + } } - // Write magic string to archive. - ArchiveFile << ARFILE_MAGIC; + // Now that we're done with the symbol table, get the ending file position + unsigned endpos = ARFile.tellp(); - // Write the symbol table and string pool - writeSymbolTable(ArchiveFile); + // Make sure that the amount we wrote is what we pre-computed. This is + // critical for file integrity purposes. + assert(endpos - startpos == symTabSize && "Invalid symTabSize computation"); - //Loop over all member files, and add to the archive. - for ( unsigned i = 0; i < members.size(); ++i) { - if(ArchiveFile.tellp() % 2 != 0) - ArchiveFile << ARFILE_PAD; - writeMember(members[i],ArchiveFile); - } - - //Close archive file. - ArchiveFile.close(); + // Make sure the symbol table is even sized + if (symTabSize % 2 != 0 ) + ARFile << ARFILE_PAD; } -// vim: sw=2 ai +void +Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames, + bool Compress, bool PrintSymTab) { + + // Make sure they haven't opened up the file, not loaded it, + // but are now trying to write it which would wipe out the file. + assert(!(members.empty() && mapfile->size() > 8)); + + // Create a temporary file to store the archive in + sys::Path TmpArchive = archPath; + TmpArchive.createTemporaryFile(); + + // Make sure the temporary gets removed if we crash + sys::RemoveFileOnSignal(TmpArchive); + + // Ensure we can remove the temporary even in the face of an exception + try { + // Create archive file for output. + std::ofstream ArchiveFile(TmpArchive.c_str()); + + // Check for errors opening or creating archive file. + if ( !ArchiveFile.is_open() || ArchiveFile.bad() ) { + throw std::string("Error opening archive file: ") + archPath.get(); + } + + // If we're creating a symbol table, reset it now + if (CreateSymbolTable) { + symTabSize = 0; + symTab.clear(); + } + + // Write magic string to archive. + ArchiveFile << ARFILE_MAGIC; + + // Loop over all member files, and write them out. Note that this also + // builds the symbol table, symTab. + for ( MembersList::iterator I = begin(), E = end(); I != E; ++I) { + writeMember(*I,ArchiveFile,CreateSymbolTable,TruncateNames,Compress); + } + + // Close archive file. + ArchiveFile.close(); + + // Write the symbol table + if (CreateSymbolTable) { + // At this point we have written a file that is a legal archive but it + // doesn't have a symbol table in it. To aid in faster reading and to + // ensure compatibility with other archivers we need to put the symbol + // table first in the file. Unfortunately, this means mapping the file + // we just wrote back in and copying it to the destination file. + sys::MappedFile arch(TmpArchive); + const char* base = (const char*) arch.map(); + + // Open the final file to write and check it. + std::ofstream FinalFile(archPath.c_str()); + if ( !FinalFile.is_open() || FinalFile.bad() ) { + throw std::string("Error opening archive file: ") + archPath.get(); + } + + // Write the file magic number + FinalFile << ARFILE_MAGIC; + + // Put out the symbol table + writeSymbolTable(FinalFile,PrintSymTab); + + // Copy the temporary file contents being sure to skip the file's magic + // number. + FinalFile.write(base + sizeof(ARFILE_MAGIC)-1, + arch.size()-sizeof(ARFILE_MAGIC)+1); + + // Close up shop + FinalFile.close(); + arch.unmap(); + TmpArchive.destroyFile(); + + } else { + // We don't have to insert the symbol table, so just renaming the temp + // file to the correct name will suffice. + TmpArchive.renameFile(archPath); + } + } catch (...) { + // Make sure we clean up. + if (TmpArchive.exists()) + TmpArchive.destroyFile(); + throw; + } +}