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374 lines
11 KiB
C++
374 lines
11 KiB
C++
//===----------------------------------------------------------------------===//
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// LLVM 'ar' UTILITY
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//
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// This utility may be invoked in the following manner:
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// llvm-ar archivename files..
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//
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//===----------------------------------------------------------------------===//
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#include "Support/CommandLine.h"
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Module.h"
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#include <string>
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#include <iostream>
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#include <fstream>
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#include <vector>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/mman.h>
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using std::string;
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using std::vector;
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using std::cout;
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#define ARFMAG "\n" /* header trailer string */
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#define ARMAG "!<arch>\n" /* magic string */
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#define SARMAG 8 /* length of magic string */
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namespace {
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// Each file member is preceded by a file member header. Which is
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// of the following format:
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//
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// char ar_name[16] - '/' terminated file member name.
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// If the file name does not fit, a dummy name is used.
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// char ar_date[12] - file date in decimal
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// char ar_uid[6] - User id of file owner in decimal.
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// char ar_gid[6] - Group ID file belongs to in decimal.
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// char ar_mode[8] - File mode in octal.
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// char ar_size[10] - Size of file in decimal.
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// char ar_fmag[2] - Trailer of header file, a newline.
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struct ar_hdr {
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char name[16];
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char date[12];
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char uid[6];
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char gid[6];
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char mode[8];
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char size[10];
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char fmag[2];
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void init() {
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memset(name,' ',16);
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memset(date,' ',12);
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memset(uid,' ',6);
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memset(gid,' ',6);
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memset(mode,' ',8);
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memset(size,' ',10);
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memset(fmag,' ',2);
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}
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};
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}
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//Option to generate symbol table or not
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//running llvm-ar -s is the same as ranlib
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cl::opt<bool> SymbolTable ("s", cl::desc("Generate an archive symbol table"));
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//Archive name
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cl::opt<string> Archive (cl::Positional, cl::desc("<archive file>"),
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cl::Required);
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//For now we require one or more member files, this should change so
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//we can just run llvm-ar -s on an archive to generate the symbol
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//table
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cl::list<string> Members(cl::ConsumeAfter, cl::desc("<archive members>..."));
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static inline bool Error(std::string *ErrorStr, const char *Message) {
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if (ErrorStr) *ErrorStr = Message;
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return true;
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}
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// WriteSymbolTable - Writes symbol table to ArchiveFile, return false
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// on errors. Also returns by reference size of symbol table.
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//
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// Overview of method:
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// 1) Generate the header for the symbol table. This is a normal
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// archive member header, but it has a zero length name.
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// 2) For each archive member file, stat the file and parse the bytecode
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// Store cummulative offset (file size + header size).
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// 3) Loop over all the symbols for the current member file,
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// add offset entry to offset vector, and add symbol name to its vector.
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// Note: The symbol name vector is a vector of chars to speed up calculating
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// the total size of the symbol table.
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// 4) Update offset vector once we know the total size of symbol table. This is
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// because the symbol table appears before all archive member file contents.
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// We add the size of magic string, and size of symbol table to each offset.
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// 5) If the new updated offset it not even, we add 1 byte to offset because
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// a newline will be inserted when writing member files. This adjustment is
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// cummulative (ie. each time we have an odd offset we add 1 to total adjustment).
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// 6) Lastly, write symbol table to file.
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//
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bool WriteSymbolTable(std::ofstream &ArchiveFile) {
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//Create header for symbol table. This is essentially an empty header with the
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//name set to a '/' to indicate its a symbol table.
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ar_hdr Hdr;
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Hdr.init();
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//Name of symbol table is '/'
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Hdr.name[0] = '/';
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Hdr.name[1] = '\0';
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//Set the header trailer to a newline
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memcpy(Hdr.fmag,ARFMAG,sizeof(ARFMAG));
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//Write header to archive file
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ArchiveFile.write((char*)&Hdr, sizeof(Hdr));
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unsigned memoff = 0; //Keep Track of total size of files added to archive
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vector<unsigned> offsets; //Vector of offsets into archive file
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vector<char> names; //Vector of characters that are the symbol names.
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//Loop over archive member files, parse bytecode, and generate symbol table.
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for(unsigned i=0; i<Members.size(); ++i) {
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//Open Member file for reading and copy to buffer
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int FD = open(Members[i].c_str(),O_RDONLY);
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//Check for errors opening the file.
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if (FD == -1) {
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std::cerr << "Error opening file!\n";
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return false;
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}
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//Stat the file to get its size.
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struct stat StatBuf;
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if (stat(Members[i].c_str(), &StatBuf) == -1 || StatBuf.st_size == 0) {
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std::cerr << "Error stating file\n";
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return false;
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}
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//Size of file
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unsigned Length = StatBuf.st_size;
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//Read in file into a buffer.
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unsigned char *buf = (unsigned char*)mmap(0, Length,PROT_READ,
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MAP_PRIVATE, FD, 0);
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//Check if mmap failed.
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if (buf == (unsigned char*)MAP_FAILED) {
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std::cerr << "Error mmapping file!\n";
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return false;
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}
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//Parse the bytecode file and get all the symbols.
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string ErrorStr;
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Module *M = ParseBytecodeBuffer(buf,Length,Members[i],&ErrorStr);
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//Check for errors parsing bytecode.
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//if(ErrorStr) {
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//std::cerr << "Error Parsing Bytecode\n";
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//return false;
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//}
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//Loop over function names and global vars and add to symbol maps
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for(Module::iterator I = M->begin(), E=M->end(); I != E; ++I) {
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//get function name
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string NM = ((Function*)I)->getName();
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//Loop over the characters in the name and add to symbol name vector
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for(unsigned i=0; i<NM.size(); ++i)
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names.push_back(NM[i]);
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//Each symbol is null terminated.
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names.push_back('\0');
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//Add offset to vector of offsets
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offsets.push_back(memoff);
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}
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memoff += Length + sizeof(Hdr);
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}
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//Determine how large our symbol table is.
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unsigned symbolTableSize = sizeof(Hdr) + 4 + 4*(offsets.size()) + names.size();
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cout << "Symbol Table Size: " << symbolTableSize << "\n";
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//Number of symbols should be in network byte order as well
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char num[4];
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unsigned temp = offsets.size();
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num[0] = (temp >> 24) & 255;
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num[1] = (temp >> 16) & 255;
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num[2] = (temp >> 8) & 255;
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num[3] = temp & 255;
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//Write number of symbols to archive file
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ArchiveFile.write(num,4);
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//Adjustment to offset to start files on even byte boundaries
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unsigned adjust = 0;
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//Update offsets write symbol tabel to archive.
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for(unsigned i=0; i<offsets.size(); ++i) {
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char output[4];
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offsets[i] = offsets[i] + symbolTableSize + SARMAG;
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offsets[i] += adjust;
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if((offsets[i] % 2 != 0)) {
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adjust++;
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offsets[i] += adjust;
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}
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cout << "Offset: " << offsets[i] << "\n";
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output[0] = (offsets[i] >> 24) & 255;
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output[1] = (offsets[i] >> 16) & 255;
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output[2] = (offsets[i] >> 8) & 255;
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output[3] = offsets[i] & 255;
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ArchiveFile.write(output,4);
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}
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//Write out symbol name vector.
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for(unsigned i=0; i<names.size(); ++i)
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ArchiveFile << names[i];
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return true;
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}
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// AddMemberToArchive - Writes member file to archive. Returns false on errors.
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//
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// Overview of method:
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// 1) Open file, and stat it.
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// 2) Fill out header using stat information. If name is longer then 15
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// characters, use "dummy" name.
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// 3) Write header and file contents to disk.
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// 4) Keep track of total offset into file, and insert a newline if it is odd.
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//
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bool AddMemberToArchive(string Member, std::ofstream &ArchiveFile) {
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ar_hdr Hdr; //Header for archive member file.
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//stat the file to get info
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struct stat StatBuf;
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if (stat(Member.c_str(), &StatBuf) == -1 || StatBuf.st_size == 0)
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cout << "ERROR\n";
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//fill in header
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//set name to white spaces
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memset(Hdr.name,' ', sizeof(Hdr.name));
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//check the size of the name, if less than 15, we can copy it directly
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//otherwise we give it a dummy name for now
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if(Member.length() < 16)
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memcpy(Hdr.name,Member.c_str(),Member.length());
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else
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memcpy(Hdr.name, "Dummy", 5);
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//terminate name with forward slash
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Hdr.name[15] = '/';
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//file member size in decimal
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unsigned Length = StatBuf.st_size;
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sprintf(Hdr.size,"%d", Length);
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cout << "Size: " << Length << "\n";
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//file member user id in decimal
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sprintf(Hdr.uid, "%d", StatBuf.st_uid);
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//file member group id in decimal
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sprintf(Hdr.gid, "%d", StatBuf.st_gid);
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//file member date in decimal
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sprintf(Hdr.date,"%d", StatBuf.st_mtime);
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//file member mode in OCTAL
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sprintf(Hdr.mode,"%d", StatBuf.st_mode);
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//add our header trailer
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memcpy(Hdr.fmag,ARFMAG,sizeof(ARFMAG));
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//write header to archive file
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ArchiveFile.write((char*)&Hdr, sizeof(Hdr));
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//open Member file for reading and copy to buffer
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int FD = open(Member.c_str(),O_RDONLY);
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if (FD == -1) {
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std::cerr << "Error opening file!\n";
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return false;
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}
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unsigned char *buf = (unsigned char*)mmap(0, Length,PROT_READ,
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MAP_PRIVATE, FD, 0);
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//check if mmap failed
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if (buf == (unsigned char*)MAP_FAILED) {
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std::cerr << "Error mmapping file!\n";
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return false;
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}
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//write to archive file
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ArchiveFile.write((char*)buf,Length);
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// Unmmap the memberfile
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munmap((char*)buf, Length);
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return true;
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}
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// CreateArchive - Generates archive with or without symbol table.
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//
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void CreateArchive() {
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//Create archive file for output.
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std::ofstream ArchiveFile(Archive.c_str());
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//Check for errors opening or creating archive file.
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if(!ArchiveFile.is_open() || ArchiveFile.bad() ) {
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std::cerr << "Error opening Archive File\n";
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exit(1);
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}
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//Write magic string to archive.
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ArchiveFile << ARMAG;
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//If the '-s' option was specified, generate symbol table.
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if(SymbolTable) {
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cout << "Symbol Table Start: " << ArchiveFile.tellp() << "\n";
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if(!WriteSymbolTable(ArchiveFile)) {
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std::cerr << "Error creating symbol table. Exiting program.";
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exit(1);
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}
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cout << "Symbol Table End: " << ArchiveFile.tellp() << "\n";
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}
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//Loop over all member files, and add to the archive.
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for(unsigned i=0; i<Members.size(); ++i) {
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if(ArchiveFile.tellp() % 2 != 0)
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ArchiveFile << ARFMAG;
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cout << "Member File Start: " << ArchiveFile.tellp() << "\n";
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if(AddMemberToArchive(Members[i],ArchiveFile) != true) {
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std::cerr << "Error adding file to archive. Exiting program.";
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exit(1);
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}
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cout << "Member File End: " << ArchiveFile.tellp() << "\n";
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}
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//Close archive file.
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ArchiveFile.close();
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}
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int main(int argc, char **argv) {
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//Parse Command line options
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cl::ParseCommandLineOptions(argc, argv, " llvm-ar\n");
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//Create archive!
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CreateArchive();
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return 0;
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}
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