Completely rewritten to allow reading of archives and symbol table lookup in a more efficient manner.
llvm-svn: 17767
This commit is contained in:
Reid Spencer
parent
948ff3d628
commit
f0c201b34d
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@ -1,194 +1,403 @@
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//===- lib/Archive/ArchiveReader.cpp - Read LLVM archive files ------------===//
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//===-- ArchiveReader.cpp - Read LLVM archive files -------------*- C++ -*-===//
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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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// This file was developed by Reid Spencer and is distributed under the
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// 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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// Builds up standard unix archive files (.a) containing LLVM bytecode.
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//
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//===----------------------------------------------------------------------===//
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#include "ArchiveInternals.h"
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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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/// Read a variable-bit-rate encoded unsigned integer
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inline unsigned readInteger(const char*&At, const char*End) {
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unsigned Shift = 0;
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unsigned Result = 0;
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do {
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if (At == End)
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throw std::string("Ran out of data reading vbr_uint!");
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Result |= (unsigned)((*At++) & 0x7F) << Shift;
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Shift += 7;
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} while (At[-1] & 0x80);
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return Result;
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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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// Completely parse the Archive's symbol table and populate symTab member var.
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void
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Archive::parseSymbolTable(const void* data, unsigned size) {
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const char* At = (const char*) data;
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const char* End = At + size;
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while (At < End) {
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unsigned offset = readInteger(At, End);
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unsigned length = readInteger(At, End);
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if (At + length > End)
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throw std::string("malformed symbol table");
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// we don't care if it can't be inserted (duplicate entry)
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symTab.insert(std::make_pair(std::string(At,length),offset));
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At += length;
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}
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symTabSize = size;
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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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// This member parses an ArchiveMemberHeader that is presumed to be pointed to
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// by At. The At pointer is updated to the byte just after the header, which
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// can be variable in size.
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ArchiveMember*
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Archive::parseMemberHeader(const char*& At, const char* End) {
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assert(At + sizeof(ArchiveMemberHeader) < End && "Not enough data");
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// Cast archive member header
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ArchiveMemberHeader* Hdr = (ArchiveMemberHeader*)At;
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At += sizeof(ArchiveMemberHeader);
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// Instantiate the ArchiveMember to be filled
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ArchiveMember* member = new ArchiveMember(this);
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// Extract the size and determine if the file is
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// compressed or not (negative length).
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int flags = 0;
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int MemberSize = atoi(Hdr->size);
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if (MemberSize < 0) {
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flags |= ArchiveMember::CompressedFlag;
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MemberSize = -MemberSize;
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}
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// Check the size of the member for sanity
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if (At + MemberSize > End)
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throw std::string("invalid member length in archive file");
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// Check the member signature
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if (!Hdr->checkSignature())
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throw std::string("invalid file member signature");
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// Convert and check the member name
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// The empty name ( '/' and 15 blanks) is for a foreign (non-LLVM) symbol
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// table. The special name "//" and 14 blanks is for a string table, used
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// for long file names. This library doesn't generate either of those but
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// it will accept them. If the name starts with #1/ and the remainder is
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// digits, then those digits specify the length of the name that is
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// stored immediately following the header. The special name
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// __LLVM_SYM_TAB__ identifies the symbol table for LLVM bytecode.
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// Anything else is a regular, short filename that is terminated with
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// a '/' and blanks.
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std::string pathname;
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unsigned index;
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switch (Hdr->name[0]) {
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case '#':
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if (Hdr->name[1] == '1' && Hdr->name[2] == '/') {
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if (isdigit(Hdr->name[3])) {
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unsigned len = atoi(&Hdr->name[3]);
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pathname.assign(At,len);
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At += len + 1; // terminated by \n
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flags |= ArchiveMember::HasLongFilenameFlag;
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} else
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throw std::string("invalid long filename");
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} else if (Hdr->name[1] == '_' &&
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(0==memcmp(Hdr->name,ARFILE_LLVM_SYMTAB_NAME,16))) {
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// The member is using a long file name (>15 chars) format.
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// This format is standard for 4.4BSD and Mac OSX operating
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// systems. LLVM uses it similarly. In this format, the
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// remainder of the name field (after #1/) specifies the
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// length of the file name which occupy the first bytes of
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// the member's data. The pathname already has the #1/ stripped.
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pathname.assign(ARFILE_LLVM_SYMTAB_NAME);
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flags |= ArchiveMember::LLVMSymbolTableFlag;
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}
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break;
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case '/':
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if (Hdr->name[1]== '/') {
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if (0==memcmp(Hdr->name,ARFILE_STRTAB_NAME,16)) {
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pathname.assign(ARFILE_STRTAB_NAME);
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flags |= ArchiveMember::StringTableFlag;
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} else {
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throw std::string("invalid string table name");
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}
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} else if (Hdr->name[1] == ' ') {
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if (0==memcmp(Hdr->name,ARFILE_SYMTAB_NAME,16)) {
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pathname.assign(ARFILE_SYMTAB_NAME);
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flags |= ArchiveMember::ForeignSymbolTableFlag;
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} else {
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throw std::string("invalid foreign symbol table name");
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}
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} else if (isdigit(Hdr->name[1])) {
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unsigned index = atoi(&Hdr->name[1]);
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if (index < strtab.length()) {
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const char* namep = strtab.c_str() + index;
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const char* endp = strtab.c_str() + strtab.length();
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const char* p = namep;
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const char* last_p = p;
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while (p < endp) {
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if (*p == '\n' && *last_p == '/') {
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pathname.assign(namep,last_p-namep);
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flags |= ArchiveMember::HasLongFilenameFlag;
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break;
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}
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last_p = p;
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p++;
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}
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if (p >= endp)
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throw std::string("missing name termiantor in string table");
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} else {
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throw std::string("name index beyond string table");
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}
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}
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break;
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default:
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char* slash = (char*) memchr(Hdr->name,'/',16);
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if (slash == 0)
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throw std::string("missing name terminator");
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pathname.assign(Hdr->name,slash-Hdr->name);
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break;
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}
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// Determine if this is a bytecode file
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switch (sys::IdentifyFileType(At,4)) {
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case sys::BytecodeFileType:
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flags |= ArchiveMember::BytecodeFlag;
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break;
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case sys::CompressedBytecodeFileType:
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flags |= ArchiveMember::CompressedBytecodeFlag;
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flags &= ~ArchiveMember::CompressedFlag;
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break;
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default:
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flags &= ~(ArchiveMember::BytecodeFlag|
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ArchiveMember::CompressedBytecodeFlag);
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break;
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}
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// Fill in fields of the ArchiveMember
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member->next = 0;
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member->prev = 0;
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member->parent = this;
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member->path.setFile(pathname);
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member->info.fileSize = MemberSize;
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member->info.modTime.fromEpochTime(atoi(Hdr->date));
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sscanf(Hdr->mode,"%o",&(member->info.mode));
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member->info.user = atoi(Hdr->uid);
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member->info.group = atoi(Hdr->gid);
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member->flags = flags;
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member->data = At;
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return member;
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}
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void
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Archive::checkSignature() {
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// Check the magic string at file's header
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if (mapfile->size() < 8 || memcmp(base, ARFILE_MAGIC,8))
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throw std::string("invalid signature for an archive file");
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}
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// This function loads the entire archive and fully populates its ilist with
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// the members of the archive file. This is typically used in preparation for
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// editing the contents of the archive.
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void
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Archive::loadArchive() {
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// Set up parsing
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members.clear();
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symTab.clear();
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const char *At = base;
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const char *End = base + mapfile->size();
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checkSignature();
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At += 8; // Skip the magic string.
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bool seenSymbolTable = false;
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bool foundFirstFile = false;
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while (At < End) {
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// parse the member header
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const char* Save = At;
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ArchiveMember* mbr = parseMemberHeader(At, End);
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// check if this is the foreign symbol table
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if (mbr->isForeignSymbolTable()) {
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// We don't do anything with this but delete it
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At += mbr->getSize();
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delete mbr;
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if ((int(At) & 1) == 1)
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At++;
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} else if (mbr->isStringTable()) {
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strtab.assign(At,mbr->getSize());
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At += mbr->getSize();
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if ((int(At) & 1) == 1)
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At++;
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delete mbr;
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} else if (mbr->isLLVMSymbolTable()) {
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if (seenSymbolTable)
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throw std::string("invalid archive: multiple symbol tables");
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parseSymbolTable(mbr->getData(),mbr->getSize());
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seenSymbolTable = true;
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At += mbr->getSize();
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if ((int(At) & 1) == 1)
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At++;
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delete mbr;
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} else {
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if (!foundFirstFile) {
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firstFileOffset = Save - base;
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foundFirstFile = true;
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}
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members.push_back(mbr);
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At += mbr->getSize();
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if ((int(At) & 1) == 1)
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At++;
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}
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}
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}
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// Open and completely load the archive file.
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Archive*
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Archive::OpenAndLoad(const sys::Path& file) {
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Archive* result = new Archive(file,true);
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result->loadArchive();
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return result;
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}
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// Get all the bytecode modules from the archive
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bool
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Archive::getAllModules(std::vector<Module*>& Modules, std::string* ErrMessage) {
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for (iterator I=begin(), E=end(); I != E; ++I) {
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if (I->isBytecode() || I->isCompressedBytecode()) {
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Module* M = ParseBytecodeBuffer((const unsigned char*)I->getData(),
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I->getSize(), I->getPath().get(), ErrMessage);
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if (!M)
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return true;
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Modules.push_back(M);
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}
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}
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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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// Load just the symbol table from the archive file
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void
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Archive::loadSymbolTable() {
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std::vector<char> LongFilenames;
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// Set up parsing
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members.clear();
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symTab.clear();
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const char *At = base;
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const char *End = base + mapfile->size();
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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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// Make sure we're dealing with an archive
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checkSignature();
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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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At += 8; // Skip signature
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// Parse the first file member header
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const char* FirstFile = At;
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ArchiveMember* mbr = parseMemberHeader(At, End);
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if (mbr->isForeignSymbolTable()) {
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// Skip the foreign symbol table, we don't do anything with it
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At += mbr->getSize();
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delete mbr;
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// See if there's a string table too
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FirstFile = At;
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mbr = parseMemberHeader(At,End);
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if (mbr->isStringTable()) {
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strtab.assign((const char*)mbr->getData(),mbr->getSize());
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At += mbr->getSize();
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delete mbr;
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FirstFile = At;
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mbr = parseMemberHeader(At,End);
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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...
|
||||
unsigned char *Buffer =
|
||||
(unsigned char*)ReadFileIntoAddressSpace(Filename, Length);
|
||||
if (Buffer == 0) {
|
||||
if (ErrorStr) *ErrorStr = "Error reading file '" + Filename + "'!";
|
||||
return true;
|
||||
// See if its the symbol table
|
||||
if (mbr->isLLVMSymbolTable()) {
|
||||
parseSymbolTable(mbr->getData(),mbr->getSize());
|
||||
FirstFile = At + mbr->getSize();
|
||||
if (mbr->getSize() % 2 != 0)
|
||||
FirstFile++;
|
||||
} else {
|
||||
// There's no symbol table in the file. We have to rebuild it from scratch
|
||||
// because the intent of this method is to get the symbol table loaded so
|
||||
// it can be searched efficiently.
|
||||
// Add the member to the members list
|
||||
members.push_back(mbr);
|
||||
}
|
||||
|
||||
// Parse the archive files we mmap'ped in
|
||||
bool Result = ReadArchiveBuffer(Filename, Buffer, Length, Objects, ErrorStr);
|
||||
|
||||
// Unmmap the archive...
|
||||
UnmapFileFromAddressSpace(Buffer, Length);
|
||||
|
||||
if (Result) // Free any loaded objects
|
||||
while (!Objects.empty()) {
|
||||
delete Objects.back();
|
||||
Objects.pop_back();
|
||||
}
|
||||
|
||||
return Result;
|
||||
firstFileOffset = FirstFile - base;
|
||||
}
|
||||
|
||||
// Open the archive and load just the symbol tables
|
||||
Archive*
|
||||
Archive::OpenAndLoadSymbols(const sys::Path& file) {
|
||||
Archive* result = new Archive(file,true);
|
||||
|
||||
result->loadSymbolTable();
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
// Look up one symbol in the symbol table and return a ModuleProvider for the
|
||||
// module that defines that symbol.
|
||||
ModuleProvider*
|
||||
Archive::findModuleDefiningSymbol(const std::string& symbol) {
|
||||
SymTabType::iterator SI = symTab.find(symbol);
|
||||
if (SI == symTab.end())
|
||||
return 0;
|
||||
|
||||
// The symbol table was previously constructed assuming that the members were
|
||||
// written without the symbol table header. Because VBR encoding is used, the
|
||||
// values could not be adjusted to account for the offset of the symbol table
|
||||
// because that could affect the size of the symbol table due to VBR encoding.
|
||||
// We now have to account for this by adjusting the offset by the size of the
|
||||
// symbol table and its header.
|
||||
unsigned fileOffset =
|
||||
SI->second + // offset in symbol-table-less file
|
||||
firstFileOffset; // add offset to first "real" file in archive
|
||||
|
||||
// See if the module is already loaded
|
||||
ModuleMap::iterator MI = modules.find(fileOffset);
|
||||
if (MI != modules.end())
|
||||
return MI->second.first;
|
||||
|
||||
// Module hasn't been loaded yet, we need to load it
|
||||
const char* modptr = base + fileOffset;
|
||||
ArchiveMember* mbr = parseMemberHeader(modptr, base + mapfile->size());
|
||||
|
||||
// Now, load the bytecode module to get the ModuleProvider
|
||||
ModuleProvider* mp = getBytecodeBufferModuleProvider(
|
||||
(const unsigned char*) mbr->getData(), mbr->getSize(),
|
||||
mbr->getPath().get(), 0);
|
||||
|
||||
modules.insert(std::make_pair(fileOffset,std::make_pair(mp,mbr)));
|
||||
|
||||
return mp;
|
||||
}
|
||||
|
||||
// Look up multiple symbols in the symbol table and return a set of
|
||||
// ModuleProviders that define those symbols.
|
||||
void
|
||||
Archive::findModulesDefiningSymbols(const std::set<std::string>& symbols,
|
||||
std::set<ModuleProvider*>& modules)
|
||||
{
|
||||
for (std::set<std::string>::const_iterator I=symbols.begin(),
|
||||
E=symbols.end(); I != E; ++I) {
|
||||
ModuleProvider* mp = findModuleDefiningSymbol(*I);
|
||||
if (mp) {
|
||||
modules.insert(mp);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue