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-rw-r--r--lib/Archive/ArchiveWriter.cpp429
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diff --git a/lib/Archive/ArchiveWriter.cpp b/lib/Archive/ArchiveWriter.cpp
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-//===-- ArchiveWriter.cpp - Write LLVM archive files ----------------------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// Builds up an LLVM archive file (.a) containing LLVM bitcode.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Bitcode/Archive.h"
-#include "ArchiveInternals.h"
-#include "llvm/ADT/OwningPtr.h"
-#include "llvm/Bitcode/ReaderWriter.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Support/FileSystem.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/Process.h"
-#include "llvm/Support/Signals.h"
-#include "llvm/Support/system_error.h"
-#include <fstream>
-#include <iomanip>
-#include <ostream>
-using namespace llvm;
-
-// Write an integer using variable bit rate encoding. This saves a few bytes
-// per entry in the symbol table.
-static 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.
-static inline unsigned numVbrBytes(unsigned num) {
-
- // Note that the following nested ifs are somewhat equivalent to a binary
- // search. We split it in half by comparing against 2^14 first. This allows
- // most reasonable values to be done in 2 comparisons instead of 1 for
- // small ones and four for large ones. We expect this to access file offsets
- // in the 2^10 to 2^24 range and symbol lengths in the 2^0 to 2^8 range,
- // so this approach is reasonable.
- if (num < 1<<14) {
- if (num < 1<<7)
- return 1;
- else
- return 2;
- }
- if (num < 1<<21)
- return 3;
-
- if (num < 1<<28)
- return 4;
- return 5; // anything >= 2^28 takes 5 bytes
-}
-
-// Create an empty archive.
-Archive* Archive::CreateEmpty(const sys::Path& FilePath, LLVMContext& C) {
- Archive* result = new Archive(FilePath, C);
- return result;
-}
-
-// Fill the ArchiveMemberHeader with the information from a member. If
-// TruncateNames is true, names are flattened to 15 chars or less. The sz field
-// is provided here instead of coming from the mbr because the member might be
-// stored compressed and the compressed size is not the ArchiveMember's size.
-// Furthermore compressed files have negative size fields to identify them as
-// compressed.
-bool
-Archive::fillHeader(const ArchiveMember &mbr, ArchiveMemberHeader& hdr,
- int sz, bool TruncateNames) const {
-
- // 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 last modification date
- uint64_t secondsSinceEpoch = mbr.getModTime().toEpochTime();
- sprintf(buffer,"%-12u", unsigned(secondsSinceEpoch));
- memcpy(hdr.date,buffer,12);
-
- // Get rid of trailing blanks in the name
- std::string mbrPath = mbr.getPath().str();
- size_t mbrLen = mbrPath.length();
- while (mbrLen > 0 && mbrPath[mbrLen-1] == ' ') {
- mbrPath.erase(mbrLen-1,1);
- mbrLen--;
- }
-
- // Set the name field in one of its various flavors.
- bool writeLongName = false;
- if (mbr.isStringTable()) {
- memcpy(hdr.name,ARFILE_STRTAB_NAME,16);
- } else if (mbr.isSVR4SymbolTable()) {
- memcpy(hdr.name,ARFILE_SVR4_SYMTAB_NAME,16);
- } else if (mbr.isBSD4SymbolTable()) {
- memcpy(hdr.name,ARFILE_BSD4_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;
- memcpy(hdr.name,nm,len);
- hdr.name[len] = '/';
- } else if (mbrPath.length() < 16 && mbrPath.find('/') == std::string::npos) {
- memcpy(hdr.name,mbrPath.c_str(),mbrPath.length());
- hdr.name[mbrPath.length()] = '/';
- } else {
- std::string nm = "#1/";
- nm += utostr(mbrPath.length());
- memcpy(hdr.name,nm.data(),nm.length());
- if (sz < 0)
- sz -= mbrPath.length();
- else
- sz += mbrPath.length();
- writeLongName = true;
- }
-
- // 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);
-
- return writeLongName;
-}
-
-// Insert a file into the archive before some other member. This also takes care
-// of extracting the necessary flags and information from the file.
-bool
-Archive::addFileBefore(const sys::Path& filePath, iterator where,
- std::string* ErrMsg) {
- bool Exists;
- if (sys::fs::exists(filePath.str(), Exists) || !Exists) {
- if (ErrMsg)
- *ErrMsg = "Can not add a non-existent file to archive";
- return true;
- }
-
- ArchiveMember* mbr = new ArchiveMember(this);
-
- mbr->data = 0;
- mbr->path = filePath;
- const sys::FileStatus *FSInfo = mbr->path.getFileStatus(false, ErrMsg);
- if (!FSInfo) {
- delete mbr;
- return true;
- }
- mbr->info = *FSInfo;
-
- unsigned flags = 0;
- bool hasSlash = filePath.str().find('/') != std::string::npos;
- if (hasSlash)
- flags |= ArchiveMember::HasPathFlag;
- if (hasSlash || filePath.str().length() > 15)
- flags |= ArchiveMember::HasLongFilenameFlag;
-
- sys::fs::file_magic type;
- if (sys::fs::identify_magic(mbr->path.str(), type))
- type = sys::fs::file_magic::unknown;
- switch (type) {
- case sys::fs::file_magic::bitcode:
- flags |= ArchiveMember::BitcodeFlag;
- break;
- default:
- break;
- }
- mbr->flags = flags;
- members.insert(where,mbr);
- return false;
-}
-
-// Write one member out to the file.
-bool
-Archive::writeMember(
- const ArchiveMember& member,
- std::ofstream& ARFile,
- bool CreateSymbolTable,
- bool TruncateNames,
- std::string* ErrMsg
-) {
-
- 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();
- MemoryBuffer *mFile = 0;
- if (!data) {
- OwningPtr<MemoryBuffer> File;
- if (error_code ec = MemoryBuffer::getFile(member.getPath().c_str(), File)) {
- if (ErrMsg)
- *ErrMsg = ec.message();
- return true;
- }
- mFile = File.take();
- data = mFile->getBufferStart();
- fSize = mFile->getBufferSize();
- }
-
- // Now that we have the data in memory, update the
- // symbol table if it's a bitcode file.
- if (CreateSymbolTable && member.isBitcode()) {
- std::vector<std::string> symbols;
- std::string FullMemberName = archPath.str() + "(" + member.getPath().str()
- + ")";
- Module* M =
- GetBitcodeSymbols(data, fSize, FullMemberName, Context, symbols, ErrMsg);
-
- // If the bitcode parsed successfully
- if ( M ) {
- for (std::vector<std::string>::iterator SI = symbols.begin(),
- SE = symbols.end(); SI != SE; ++SI) {
-
- std::pair<SymTabType::iterator,bool> Res =
- symTab.insert(std::make_pair(*SI,filepos));
-
- if (Res.second) {
- symTabSize += SI->length() +
- numVbrBytes(SI->length()) +
- numVbrBytes(filepos);
- }
- }
- // We don't need this module any more.
- delete M;
- } else {
- delete mFile;
- if (ErrMsg)
- *ErrMsg = "Can't parse bitcode member: " + member.getPath().str()
- + ": " + *ErrMsg;
- return true;
- }
- }
-
- int hdrSize = fSize;
-
- // Compute the fields of the header
- ArchiveMemberHeader Hdr;
- bool writeLongName = fillHeader(member,Hdr,hdrSize,TruncateNames);
-
- // Write header to archive file
- ARFile.write((char*)&Hdr, sizeof(Hdr));
-
- // Write the long filename if its long
- if (writeLongName) {
- ARFile.write(member.getPath().str().data(),
- member.getPath().str().length());
- }
-
- // 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() & 1) == 1)
- ARFile << ARFILE_PAD;
-
- // Close the mapped file if it was opened
- delete mFile;
- return false;
-}
-
-// Write the entire archive to the file specified when the archive was created.
-// This writes to a temporary file first. Options are for creating a symbol
-// table, flattening the file names (no directories, 15 chars max) and
-// compressing each archive member.
-bool
-Archive::writeToDisk(bool CreateSymbolTable, bool TruncateNames,
- std::string* ErrMsg)
-{
- // 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.
- if (members.empty() && mapfile && mapfile->getBufferSize() > 8) {
- if (ErrMsg)
- *ErrMsg = "Can't write an archive not opened for writing";
- return true;
- }
-
- // Create a temporary file to store the archive in
- sys::Path TmpArchive = archPath;
- if (TmpArchive.createTemporaryFileOnDisk(ErrMsg))
- return true;
-
- // Make sure the temporary gets removed if we crash
- sys::RemoveFileOnSignal(TmpArchive.str());
-
- // Create archive file for output.
- std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
- std::ios::binary;
- std::ofstream ArchiveFile(TmpArchive.c_str(), io_mode);
-
- // Check for errors opening or creating archive file.
- if (!ArchiveFile.is_open() || ArchiveFile.bad()) {
- TmpArchive.eraseFromDisk();
- if (ErrMsg)
- *ErrMsg = "Error opening archive file: " + archPath.str();
- return true;
- }
-
- // 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) {
- if (writeMember(*I, ArchiveFile, CreateSymbolTable,
- TruncateNames, ErrMsg)) {
- TmpArchive.eraseFromDisk();
- ArchiveFile.close();
- return true;
- }
- }
-
- // 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::Path FinalFilePath = archPath;
-
- // Map in the archive we just wrote.
- {
- OwningPtr<MemoryBuffer> arch;
- if (error_code ec = MemoryBuffer::getFile(TmpArchive.c_str(), arch)) {
- if (ErrMsg)
- *ErrMsg = ec.message();
- return true;
- }
- const char* base = arch->getBufferStart();
-
- // Open another temporary file in order to avoid invalidating the
- // mmapped data
- if (FinalFilePath.createTemporaryFileOnDisk(ErrMsg))
- return true;
- sys::RemoveFileOnSignal(FinalFilePath.str());
-
- std::ofstream FinalFile(FinalFilePath.c_str(), io_mode);
- if (!FinalFile.is_open() || FinalFile.bad()) {
- TmpArchive.eraseFromDisk();
- if (ErrMsg)
- *ErrMsg = "Error opening archive file: " + FinalFilePath.str();
- return true;
- }
-
- // Write the file magic number
- FinalFile << ARFILE_MAGIC;
-
- // If there is a foreign symbol table, put it into the file now. Most
- // ar(1) implementations require the symbol table to be first but llvm-ar
- // can deal with it being after a foreign symbol table. This ensures
- // compatibility with other ar(1) implementations as well as allowing the
- // archive to store both native .o and LLVM .bc files, both indexed.
- if (foreignST) {
- if (writeMember(*foreignST, FinalFile, false, false, ErrMsg)) {
- FinalFile.close();
- TmpArchive.eraseFromDisk();
- return true;
- }
- }
-
- // Copy the temporary file contents being sure to skip the file's magic
- // number.
- FinalFile.write(base + sizeof(ARFILE_MAGIC)-1,
- arch->getBufferSize()-sizeof(ARFILE_MAGIC)+1);
-
- // Close up shop
- FinalFile.close();
- } // free arch.
-
- // Move the final file over top of TmpArchive
- if (FinalFilePath.renamePathOnDisk(TmpArchive, ErrMsg))
- return true;
- }
-
- // Before we replace the actual archive, we need to forget all the
- // members, since they point to data in that old archive. We need to do
- // this because we cannot replace an open file on Windows.
- cleanUpMemory();
-
- if (TmpArchive.renamePathOnDisk(archPath, ErrMsg))
- return true;
-
- // Set correct read and write permissions after temporary file is moved
- // to final destination path.
- if (archPath.makeReadableOnDisk(ErrMsg))
- return true;
- if (archPath.makeWriteableOnDisk(ErrMsg))
- return true;
-
- return false;
-}
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