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an llvm-ranlib symtab. This speeds up gccld -native on an almost empty .o file from 1.63s to 0.18s. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23406 91177308-0d34-0410-b5e6-96231b3b80d8
541 lines
18 KiB
C++
541 lines
18 KiB
C++
//===-- 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 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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// 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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using namespace llvm;
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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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// 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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// 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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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;
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MemberSize -= len;
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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_SVR4_SYMTAB_NAME, 16)) {
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pathname.assign(ARFILE_SVR4_SYMTAB_NAME);
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flags |= ArchiveMember::SVR4SymbolTableFlag;
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} else {
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throw std::string("invalid SVR4 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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case '_':
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if (Hdr->name[1] == '_' &&
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(0 == memcmp(Hdr->name, ARFILE_BSD4_SYMTAB_NAME, 16))) {
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pathname.assign(ARFILE_BSD4_SYMTAB_NAME);
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flags |= ArchiveMember::BSD4SymbolTableFlag;
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break;
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}
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/* FALL THROUGH */
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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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slash = Hdr->name + 16;
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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.set(pathname);
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member->info.fileSize = MemberSize;
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member->info.modTime.fromEpochTime(atoi(Hdr->date));
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unsigned int mode;
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sscanf(Hdr->mode, "%o", &mode);
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member->info.mode = 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->isSVR4SymbolTable() || mbr->isBSD4SymbolTable()) {
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// We just save this but don't do anything special
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// with it. It doesn't count as the "first file".
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if (foreignST) {
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// What? Multiple foreign symbol tables? Just chuck it
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// and retain the last one found.
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delete foreignST;
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}
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foreignST = mbr;
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At += mbr->getSize();
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if ((intptr_t(At) & 1) == 1)
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At++;
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} else if (mbr->isStringTable()) {
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// Simply suck the entire string table into a string
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// variable. This will be used to get the names of the
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// members that use the "/ddd" format for their names
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// (SVR4 style long names).
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strtab.assign(At, mbr->getSize());
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At += mbr->getSize();
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if ((intptr_t(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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// This is the LLVM symbol table for the archive. If we've seen it
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// already, its an error. Otherwise, parse the symbol table and move on.
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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 ((intptr_t(At) & 1) == 1)
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At++;
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delete mbr; // We don't need this member in the list of members.
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} else {
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// This is just a regular file. If its the first one, save its offset.
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// Otherwise just push it on the list and move on to the next file.
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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 ((intptr_t(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, std::string* ErrorMessage) {
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try {
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std::auto_ptr<Archive> result ( new Archive(file, true));
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result->loadArchive();
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return result.release();
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} catch (const std::string& msg) {
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if (ErrorMessage) {
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*ErrorMessage = msg;
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}
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return 0;
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}
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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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std::string FullMemberName = archPath.toString() +
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"(" + I->getPath().toString() + ")";
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Module* M = ParseBytecodeBuffer((const unsigned char*)I->getData(),
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I->getSize(), FullMemberName, 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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// Load just the symbol table from the archive file
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void
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Archive::loadSymbolTable() {
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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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// Make sure we're dealing with an archive
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checkSignature();
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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->isSVR4SymbolTable() || mbr->isBSD4SymbolTable()) {
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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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if ((intptr_t(At) & 1) == 1)
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At++;
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delete mbr;
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// Read the next one
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FirstFile = At;
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mbr = parseMemberHeader(At, End);
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}
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if (mbr->isStringTable()) {
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// Process the string table entry
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strtab.assign((const char*)mbr->getData(), mbr->getSize());
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At += mbr->getSize();
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if ((intptr_t(At) & 1) == 1)
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At++;
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delete mbr;
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// Get the next one
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FirstFile = At;
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mbr = parseMemberHeader(At, End);
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}
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// See if its the symbol table
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if (mbr->isLLVMSymbolTable()) {
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parseSymbolTable(mbr->getData(), mbr->getSize());
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At += mbr->getSize();
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if ((intptr_t(At) & 1) == 1)
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At++;
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FirstFile = At;
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} else {
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// There's no symbol table in the file. We have to rebuild it from scratch
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// because the intent of this method is to get the symbol table loaded so
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// it can be searched efficiently.
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// Add the member to the members list
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members.push_back(mbr);
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}
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firstFileOffset = FirstFile - base;
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}
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// Open the archive and load just the symbol tables
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Archive*
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Archive::OpenAndLoadSymbols(const sys::Path& file, std::string* ErrorMessage) {
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try {
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std::auto_ptr<Archive> result ( new Archive(file, true) );
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result->loadSymbolTable();
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return result.release();
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} catch (const std::string& msg) {
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if (ErrorMessage) {
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*ErrorMessage = msg;
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}
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return 0;
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}
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}
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// Look up one symbol in the symbol table and return a ModuleProvider for the
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// module that defines that symbol.
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ModuleProvider*
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Archive::findModuleDefiningSymbol(const std::string& symbol) {
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SymTabType::iterator SI = symTab.find(symbol);
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if (SI == symTab.end())
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return 0;
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// The symbol table was previously constructed assuming that the members were
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// written without the symbol table header. Because VBR encoding is used, the
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// values could not be adjusted to account for the offset of the symbol table
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// because that could affect the size of the symbol table due to VBR encoding.
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// We now have to account for this by adjusting the offset by the size of the
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// symbol table and its header.
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unsigned fileOffset =
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SI->second + // offset in symbol-table-less file
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firstFileOffset; // add offset to first "real" file in archive
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// See if the module is already loaded
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ModuleMap::iterator MI = modules.find(fileOffset);
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if (MI != modules.end())
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return MI->second.first;
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// Module hasn't been loaded yet, we need to load it
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const char* modptr = base + fileOffset;
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ArchiveMember* mbr = parseMemberHeader(modptr, base + mapfile->size());
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// Now, load the bytecode module to get the ModuleProvider
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std::string FullMemberName = archPath.toString() + "(" +
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mbr->getPath().toString() + ")";
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ModuleProvider* mp = getBytecodeBufferModuleProvider(
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(const unsigned char*) mbr->getData(), mbr->getSize(),
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FullMemberName, 0);
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modules.insert(std::make_pair(fileOffset, std::make_pair(mp, mbr)));
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return mp;
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}
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// Look up multiple symbols in the symbol table and return a set of
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// ModuleProviders that define those symbols.
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void
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Archive::findModulesDefiningSymbols(std::set<std::string>& symbols,
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std::set<ModuleProvider*>& result)
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{
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assert(mapfile && base && "Can't findModulesDefiningSymbols on new archive");
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if (symTab.empty()) {
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// We don't have a symbol table, so we must build it now but lets also
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// make sure that we populate the modules table as we do this to ensure
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// that we don't load them twice when findModuleDefiningSymbol is called
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// below.
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// Get a pointer to the first file
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const char* At = ((const char*)base) + firstFileOffset;
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const char* End = ((const char*)base) + mapfile->size();
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while ( At < End) {
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// Compute the offset to be put in the symbol table
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unsigned offset = At - base - firstFileOffset;
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// Parse the file's header
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ArchiveMember* mbr = parseMemberHeader(At, End);
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// If it contains symbols
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if (mbr->isBytecode() || mbr->isCompressedBytecode()) {
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// Get the symbols
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std::vector<std::string> symbols;
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std::string FullMemberName = archPath.toString() + "(" +
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mbr->getPath().toString() + ")";
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ModuleProvider* MP = GetBytecodeSymbols((const unsigned char*)At,
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mbr->getSize(), FullMemberName, symbols);
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if (MP) {
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// Insert the module's symbols into the symbol table
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for (std::vector<std::string>::iterator I = symbols.begin(),
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E=symbols.end(); I != E; ++I ) {
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symTab.insert(std::make_pair(*I, offset));
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}
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// Insert the ModuleProvider and the ArchiveMember into the table of
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// modules.
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modules.insert(std::make_pair(offset, std::make_pair(MP, mbr)));
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} else {
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throw std::string("Can't parse bytecode member: ") +
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mbr->getPath().toString();
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}
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}
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// Go to the next file location
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At += mbr->getSize();
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if ((intptr_t(At) & 1) == 1)
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At++;
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}
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}
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// At this point we have a valid symbol table (one way or another) so we
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// just use it to quickly find the symbols requested.
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for (std::set<std::string>::iterator I=symbols.begin(),
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E=symbols.end(); I != E;) {
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// See if this symbol exists
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ModuleProvider* mp = findModuleDefiningSymbol(*I);
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if (mp) {
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// The symbol exists, insert the ModuleProvider into our result,
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// duplicates wil be ignored
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result.insert(mp);
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// Remove the symbol now that its been resolved, being careful to
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// post-increment the iterator.
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symbols.erase(I++);
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} else {
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++I;
|
|
}
|
|
}
|
|
}
|
|
|
|
bool Archive::isBytecodeArchive() {
|
|
// Make sure the symTab has been loaded. In most cases this should have been
|
|
// done when the archive was constructed, but still, this is just in case.
|
|
if (!symTab.size())
|
|
loadSymbolTable();
|
|
|
|
// Now that we know it's been loaded, return true
|
|
// if it has a size
|
|
if (symTab.size()) return true;
|
|
|
|
//We still can't be sure it isn't a bytecode archive
|
|
loadArchive();
|
|
|
|
std::vector<Module *> Modules;
|
|
std::string ErrorMessage;
|
|
|
|
// Scan the archive, trying to load a bytecode member. We only load one to
|
|
// see if this works.
|
|
for (iterator I = begin(), E = end(); I != E; ++I) {
|
|
if (!I->isBytecode() && !I->isCompressedBytecode())
|
|
continue;
|
|
|
|
std::string FullMemberName =
|
|
archPath.toString() + "(" + I->getPath().toString() + ")";
|
|
Module* M = ParseBytecodeBuffer((const unsigned char*)I->getData(),
|
|
I->getSize(), FullMemberName);
|
|
if (!M)
|
|
return false; // Couldn't parse bytecode, not a bytecode archive.
|
|
delete M;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|