summaryrefslogtreecommitdiff
path: root/lib/Archive/ArchiveWriter.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'lib/Archive/ArchiveWriter.cpp')
-rw-r--r--lib/Archive/ArchiveWriter.cpp284
1 files changed, 284 insertions, 0 deletions
diff --git a/lib/Archive/ArchiveWriter.cpp b/lib/Archive/ArchiveWriter.cpp
new file mode 100644
index 00000000000..e3e2df4aee0
--- /dev/null
+++ b/lib/Archive/ArchiveWriter.cpp
@@ -0,0 +1,284 @@
+//===-- ArchiveWriter.cpp - LLVM archive writing --------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencerand 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.
+//
+//===----------------------------------------------------------------------===//
+
+#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 <fstream>
+#include <iostream>
+
+using namespace llvm;
+
+Archive*
+Archive::CreateEmpty(const sys::Path& Filename) {
+ Archive* result = new Archive;
+ Archive::ArchiveInternals* impl = result->impl = new Archive::ArchiveInternals;
+ impl->fname = Filename;
+ 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;
+
+ 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<std::string> 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);
+ }
+ }
+ 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<std::string,unsigned> SymbolMap;
+ StrTab stringPool;
+ SymbolMap symbolTable;
+ std::vector<unsigned> 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
+) {
+
+ // 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();
+
+ // Header for the archive member
+ 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() );
+
+ // Write header to archive file
+ ARFile.write((char*)&Hdr, sizeof(Hdr));
+
+ //write to archive file
+ ARFile.write(mFile.charBase(),mFile.size());
+
+ mFile.unmap();
+}
+
+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();
+ }
+
+ // Write magic string to archive.
+ ArchiveFile << ARFILE_MAGIC;
+
+ // Write the symbol table and string pool
+ writeSymbolTable(ArchiveFile);
+
+ //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();
+}
+
+// vim: sw=2 ai