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Moved to lib/Bytecode/Archive.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17800 91177308-0d34-0410-b5e6-96231b3b80d8
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Reid Spencer
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//===- ArchiveReader.cpp - Code to read LLVM bytecode from .a files -------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the ReadArchiveFile interface, which allows a linker to
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// read all of the LLVM bytecode files contained in a .a file. This file
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// understands the standard system .a file format. This can only handle the .a
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// variant prevalent on Linux systems so far, but may be extended. See
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// information in this source file for more information:
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// http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/bfd/archive.c?cvsroot=src
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Module.h"
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#include "llvm/Support/FileUtilities.h"
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#include <cstdlib>
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#include <iostream>
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using namespace llvm;
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namespace {
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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]; // Always equal to '`\n'
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};
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enum ObjectType {
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UserObject, // A user .o/.bc file
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Unknown, // Unknown file, just ignore it
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SVR4LongFilename, // a "//" section used for long file names
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ArchiveSymbolTable, // Symbol table produced by ranlib.
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};
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}
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/// getObjectType - Determine the type of object that this header represents.
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/// This is capable of parsing the variety of special sections used for various
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/// purposes.
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///
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static enum ObjectType getObjectType(ar_hdr *H, std::string MemberName,
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unsigned char *MemberData, unsigned Size) {
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// Check for sections with special names...
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if (MemberName == "__.SYMDEF " || MemberName == "__.SYMDEF SORTED")
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return ArchiveSymbolTable;
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else if (MemberName == "// ")
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return SVR4LongFilename;
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// Check to see if it looks like an llvm object file...
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if (Size >= 4 && !memcmp(MemberData, "llvm", 4))
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return UserObject;
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if (Size >= 4 && !memcmp(MemberData, "llvc", 4))
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return UserObject;
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return Unknown;
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}
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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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static bool ParseSymbolTableSection(unsigned char *Buffer, unsigned Size,
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std::string *S) {
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// Currently not supported (succeeds without doing anything)
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return false;
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}
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static bool ReadArchiveBuffer(const std::string &ArchiveName,
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unsigned char *Buffer, unsigned Length,
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std::vector<Module*> &Objects,
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std::string *ErrorStr) {
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if (Length < 8 || memcmp(Buffer, "!<arch>\n", 8))
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return Error(ErrorStr, "signature incorrect for an archive file!");
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Buffer += 8; Length -= 8; // Skip the magic string.
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std::vector<char> LongFilenames;
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while (Length >= sizeof(ar_hdr)) {
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ar_hdr *Hdr = (ar_hdr*)Buffer;
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unsigned SizeFromHeader = atoi(Hdr->size);
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if (SizeFromHeader + sizeof(ar_hdr) > Length)
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return Error(ErrorStr, "invalid record length in archive file!");
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unsigned char *MemberData = Buffer + sizeof(ar_hdr);
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unsigned MemberSize = SizeFromHeader;
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// Get name of archive member.
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char *startp = Hdr->name;
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char *endp = (char *) memchr (startp, '/', sizeof(ar_hdr));
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if (memcmp (Hdr->name, "#1/", 3) == 0) {
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// 4.4BSD/MacOSX long filenames are abbreviated as "#1/L", where L is an
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// ASCII-coded decimal number representing the length of the name buffer,
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// which is prepended to the archive member's contents.
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unsigned NameLength = atoi (&Hdr->name[3]);
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startp = (char *) MemberData;
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endp = startp + NameLength;
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MemberData += NameLength;
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MemberSize -= NameLength;
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} else if (startp == endp && isdigit (Hdr->name[1])) {
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// SVR4 long filenames are abbreviated as "/I", where I is
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// an ASCII-coded decimal index into the LongFilenames vector.
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unsigned NameIndex = atoi (&Hdr->name[1]);
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assert (LongFilenames.size () > NameIndex
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&& "SVR4-style long filename for archive member not found");
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startp = &LongFilenames[NameIndex];
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endp = strchr (startp, '/');
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} else if (startp == endp && Hdr->name[1] == '/') {
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// This is for the SVR4 long filename table (there might be other
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// names starting with // but I don't know about them). Make sure that
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// getObjectType sees it.
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endp = &Hdr->name[sizeof (Hdr->name)];
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}
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if (!endp) {
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// 4.4BSD/MacOSX *short* filenames are not guaranteed to have a
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// terminator. Start at the end of the field and backtrack over spaces.
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endp = startp + sizeof(Hdr->name);
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while (endp[-1] == ' ')
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--endp;
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}
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std::string MemberName (startp, endp);
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std::string FullMemberName = ArchiveName + "(" + MemberName + ")";
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switch (getObjectType(Hdr, MemberName, MemberData, MemberSize)) {
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case SVR4LongFilename:
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// If this is a long filename section, read all of the file names into the
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// LongFilenames vector.
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LongFilenames.assign (MemberData, MemberData + MemberSize);
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break;
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case UserObject: {
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Module *M = ParseBytecodeBuffer(MemberData, MemberSize,
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FullMemberName, ErrorStr);
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if (!M) return true;
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Objects.push_back(M);
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break;
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}
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case ArchiveSymbolTable:
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if (ParseSymbolTableSection(MemberData, MemberSize, ErrorStr))
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return true;
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break;
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default:
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std::cerr << "ReadArchiveBuffer: WARNING: Skipping unknown file: "
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<< FullMemberName << "\n";
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break; // Just ignore unknown files.
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}
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// Round SizeFromHeader up to an even number...
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SizeFromHeader = (SizeFromHeader+1)/2*2;
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Buffer += sizeof(ar_hdr)+SizeFromHeader; // Move to the next entry
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Length -= sizeof(ar_hdr)+SizeFromHeader;
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}
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return Length != 0;
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}
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// ReadArchiveFile - Read bytecode files from the specified .a file, returning
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// true on error, or false on success. This does not support reading files from
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// standard input.
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//
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bool llvm::ReadArchiveFile(const std::string &Filename,
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std::vector<Module*> &Objects,std::string *ErrorStr){
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unsigned Length;
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// mmap in the file all at once...
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unsigned char *Buffer =
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(unsigned char*)ReadFileIntoAddressSpace(Filename, Length);
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if (Buffer == 0) {
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if (ErrorStr) *ErrorStr = "Error reading file '" + Filename + "'!";
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return true;
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}
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// Parse the archive files we mmap'ped in
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bool Result = ReadArchiveBuffer(Filename, Buffer, Length, Objects, ErrorStr);
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// Unmmap the archive...
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UnmapFileFromAddressSpace(Buffer, Length);
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if (Result) // Free any loaded objects
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while (!Objects.empty()) {
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delete Objects.back();
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Objects.pop_back();
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}
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return Result;
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}
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