2006-09-29 21:58:17 +02:00
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// archive.cc -- archive support for gold
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2008-03-13 22:04:21 +01:00
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// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
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2007-09-22 23:02:10 +02:00
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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2006-09-29 21:58:17 +02:00
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#include "gold.h"
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#include <cerrno>
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#include <cstring>
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#include <climits>
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#include <vector>
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#include "elfcpp.h"
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2007-09-21 09:20:01 +02:00
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#include "options.h"
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2006-09-29 21:58:17 +02:00
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#include "fileread.h"
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2006-11-03 19:26:11 +01:00
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#include "readsyms.h"
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2006-09-29 21:58:17 +02:00
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#include "symtab.h"
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#include "object.h"
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#include "archive.h"
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namespace gold
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{
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// The header of an entry in the archive. This is all readable text,
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// padded with spaces where necesary. If the contents of an archive
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// are all text file, the entire archive is readable.
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struct Archive::Archive_header
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{
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// The entry name.
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char ar_name[16];
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// The file modification time.
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char ar_date[12];
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// The user's UID in decimal.
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char ar_uid[6];
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// The user's GID in decimal.
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char ar_gid[6];
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// The file mode in octal.
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char ar_mode[8];
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// The file size in decimal.
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char ar_size[10];
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// The final magic code.
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char ar_fmag[2];
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};
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// Archive methods.
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const char Archive::armag[sarmag] =
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{
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'!', '<', 'a', 'r', 'c', 'h', '>', '\n'
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};
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const char Archive::arfmag[2] = { '`', '\n' };
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// Set up the archive: read the symbol map and the extended name
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// table.
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void
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2007-12-14 20:00:21 +01:00
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Archive::setup(Task* task)
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2006-09-29 21:58:17 +02:00
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{
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2007-11-16 19:44:20 +01:00
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// We need to ignore empty archives.
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if (this->input_file_->file().filesize() == sarmag)
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{
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2007-12-14 20:00:21 +01:00
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this->input_file_->file().unlock(task);
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2007-11-16 19:44:20 +01:00
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return;
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}
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2006-09-29 21:58:17 +02:00
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// The first member of the archive should be the symbol table.
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std::string armap_name;
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2007-12-18 01:48:04 +01:00
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section_size_type armap_size =
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2008-01-03 00:48:49 +01:00
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convert_to_section_size_type(this->read_header(sarmag, false,
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&armap_name));
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2007-10-14 08:49:14 +02:00
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off_t off = sarmag;
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2007-08-22 01:37:56 +02:00
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if (armap_name.empty())
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{
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this->read_armap(sarmag + sizeof(Archive_header), armap_size);
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off = sarmag + sizeof(Archive_header) + armap_size;
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}
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2008-02-26 22:45:30 +01:00
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else if (!this->input_file_->options().whole_archive())
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2007-10-14 08:49:14 +02:00
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gold_error(_("%s: no archive symbol table (run ranlib)"),
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this->name().c_str());
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2007-08-22 01:37:56 +02:00
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2008-01-03 00:48:49 +01:00
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// See if there is an extended name table. We cache these views
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// because it is likely that we will want to read the following
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// header in the add_symbols routine.
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2007-08-22 01:37:56 +02:00
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if ((off & 1) != 0)
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++off;
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std::string xname;
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2008-01-03 00:48:49 +01:00
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section_size_type extended_size =
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convert_to_section_size_type(this->read_header(off, true, &xname));
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2007-08-22 01:37:56 +02:00
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if (xname == "/")
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{
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const unsigned char* p = this->get_view(off + sizeof(Archive_header),
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2008-01-03 00:48:49 +01:00
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extended_size, true);
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2007-08-22 01:37:56 +02:00
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const char* px = reinterpret_cast<const char*>(p);
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this->extended_names_.assign(px, extended_size);
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}
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// Opening the file locked it. Unlock it now.
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2007-12-14 20:00:21 +01:00
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this->input_file_->file().unlock(task);
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2007-08-22 01:37:56 +02:00
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}
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2006-09-29 21:58:17 +02:00
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2007-08-22 01:37:56 +02:00
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// Read the archive symbol map.
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void
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2007-12-18 01:48:04 +01:00
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Archive::read_armap(off_t start, section_size_type size)
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2007-08-22 01:37:56 +02:00
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{
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2006-09-29 21:58:17 +02:00
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// Read in the entire armap.
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2007-09-25 19:50:26 +02:00
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const unsigned char* p = this->get_view(start, size, false);
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2006-09-29 21:58:17 +02:00
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// Numbers in the armap are always big-endian.
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const elfcpp::Elf_Word* pword = reinterpret_cast<const elfcpp::Elf_Word*>(p);
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2006-11-06 23:46:08 +01:00
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unsigned int nsyms = elfcpp::Swap<32, true>::readval(pword);
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2006-09-29 21:58:17 +02:00
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++pword;
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// Note that the addition is in units of sizeof(elfcpp::Elf_Word).
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const char* pnames = reinterpret_cast<const char*>(pword + nsyms);
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2007-12-18 01:48:04 +01:00
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section_size_type names_size =
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reinterpret_cast<const char*>(p) + size - pnames;
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2007-09-25 19:50:26 +02:00
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this->armap_names_.assign(pnames, names_size);
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2006-09-29 21:58:17 +02:00
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this->armap_.resize(nsyms);
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2007-12-18 01:48:04 +01:00
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section_offset_type name_offset = 0;
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2006-09-29 21:58:17 +02:00
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for (unsigned int i = 0; i < nsyms; ++i)
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{
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2007-09-25 19:50:26 +02:00
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this->armap_[i].name_offset = name_offset;
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this->armap_[i].file_offset = elfcpp::Swap<32, true>::readval(pword);
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name_offset += strlen(pnames + name_offset) + 1;
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2006-09-29 21:58:17 +02:00
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++pword;
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}
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2007-12-18 01:48:04 +01:00
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if (static_cast<section_size_type>(name_offset) > names_size)
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2007-10-14 08:49:14 +02:00
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gold_error(_("%s: bad archive symbol table names"),
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this->name().c_str());
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2007-09-20 07:56:14 +02:00
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// This array keeps track of which symbols are for archive elements
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// which we have already included in the link.
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this->armap_checked_.resize(nsyms);
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2006-09-29 21:58:17 +02:00
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}
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// Read the header of an archive member at OFF. Fail if something
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// goes wrong. Return the size of the member. Set *PNAME to the name
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// of the member.
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off_t
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2008-01-03 00:48:49 +01:00
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Archive::read_header(off_t off, bool cache, std::string* pname)
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2006-09-29 21:58:17 +02:00
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{
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2008-01-03 00:48:49 +01:00
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const unsigned char* p = this->get_view(off, sizeof(Archive_header), cache);
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2006-09-29 21:58:17 +02:00
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const Archive_header* hdr = reinterpret_cast<const Archive_header*>(p);
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2007-08-22 01:37:56 +02:00
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return this->interpret_header(hdr, off, pname);
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}
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2006-09-29 21:58:17 +02:00
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2007-08-22 01:37:56 +02:00
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// Interpret the header of HDR, the header of the archive member at
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// file offset OFF. Fail if something goes wrong. Return the size of
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// the member. Set *PNAME to the name of the member.
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off_t
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Archive::interpret_header(const Archive_header* hdr, off_t off,
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std::string* pname)
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{
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2006-09-29 21:58:17 +02:00
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if (memcmp(hdr->ar_fmag, arfmag, sizeof arfmag) != 0)
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{
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2007-10-14 08:49:14 +02:00
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gold_error(_("%s: malformed archive header at %zu"),
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this->name().c_str(), static_cast<size_t>(off));
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return this->input_file_->file().filesize() - off;
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2006-09-29 21:58:17 +02:00
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}
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const int size_string_size = sizeof hdr->ar_size;
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char size_string[size_string_size + 1];
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memcpy(size_string, hdr->ar_size, size_string_size);
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char* ps = size_string + size_string_size;
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while (ps[-1] == ' ')
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--ps;
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*ps = '\0';
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errno = 0;
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char* end;
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off_t member_size = strtol(size_string, &end, 10);
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if (*end != '\0'
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|| member_size < 0
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|| (member_size == LONG_MAX && errno == ERANGE))
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{
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2007-10-14 08:49:14 +02:00
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gold_error(_("%s: malformed archive header size at %zu"),
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this->name().c_str(), static_cast<size_t>(off));
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return this->input_file_->file().filesize() - off;
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2006-09-29 21:58:17 +02:00
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}
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if (hdr->ar_name[0] != '/')
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{
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const char* name_end = strchr(hdr->ar_name, '/');
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if (name_end == NULL
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|| name_end - hdr->ar_name >= static_cast<int>(sizeof hdr->ar_name))
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{
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2007-10-14 08:57:58 +02:00
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gold_error(_("%s: malformed archive header name at %zu"),
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2007-10-14 08:49:14 +02:00
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this->name().c_str(), static_cast<size_t>(off));
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return this->input_file_->file().filesize() - off;
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2006-09-29 21:58:17 +02:00
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}
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pname->assign(hdr->ar_name, name_end - hdr->ar_name);
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}
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else if (hdr->ar_name[1] == ' ')
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{
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// This is the symbol table.
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pname->clear();
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}
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else if (hdr->ar_name[1] == '/')
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{
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// This is the extended name table.
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pname->assign(1, '/');
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}
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else
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{
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errno = 0;
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long x = strtol(hdr->ar_name + 1, &end, 10);
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if (*end != ' '
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|| x < 0
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|| (x == LONG_MAX && errno == ERANGE)
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|| static_cast<size_t>(x) >= this->extended_names_.size())
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{
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2007-10-14 08:49:14 +02:00
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gold_error(_("%s: bad extended name index at %zu"),
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this->name().c_str(), static_cast<size_t>(off));
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return this->input_file_->file().filesize() - off;
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2006-09-29 21:58:17 +02:00
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}
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const char* name = this->extended_names_.data() + x;
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const char* name_end = strchr(name, '/');
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if (static_cast<size_t>(name_end - name) > this->extended_names_.size()
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|| name_end[1] != '\n')
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{
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2007-10-14 08:49:14 +02:00
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gold_error(_("%s: bad extended name entry at header %zu"),
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this->name().c_str(), static_cast<size_t>(off));
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return this->input_file_->file().filesize() - off;
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2006-09-29 21:58:17 +02:00
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}
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pname->assign(name, name_end - name);
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}
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return member_size;
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}
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// Select members from the archive and add them to the link. We walk
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// through the elements in the archive map, and look each one up in
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// the symbol table. If it exists as a strong undefined symbol, we
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// pull in the corresponding element. We have to do this in a loop,
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// since pulling in one element may create new undefined symbols which
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// may be satisfied by other objects in the archive.
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void
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2007-09-21 09:20:01 +02:00
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Archive::add_symbols(Symbol_table* symtab, Layout* layout,
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Input_objects* input_objects)
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2006-09-29 21:58:17 +02:00
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{
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2008-02-26 22:45:30 +01:00
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if (this->input_file_->options().whole_archive())
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2007-09-21 09:20:01 +02:00
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return this->include_all_members(symtab, layout, input_objects);
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2007-08-22 01:37:56 +02:00
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2006-11-03 19:26:11 +01:00
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const size_t armap_size = this->armap_.size();
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2006-09-29 21:58:17 +02:00
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2007-09-20 07:43:14 +02:00
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// This is a quick optimization, since we usually see many symbols
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2007-09-20 21:31:54 +02:00
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// in a row with the same offset. last_seen_offset holds the last
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// offset we saw that was present in the seen_offsets_ set.
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2007-09-20 07:56:14 +02:00
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off_t last_seen_offset = -1;
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// Track which symbols in the symbol table we've already found to be
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// defined.
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2007-09-20 07:43:14 +02:00
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2006-09-29 21:58:17 +02:00
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bool added_new_object;
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do
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{
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added_new_object = false;
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for (size_t i = 0; i < armap_size; ++i)
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{
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2007-09-20 07:56:14 +02:00
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if (this->armap_checked_[i])
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continue;
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2007-09-25 19:50:26 +02:00
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if (this->armap_[i].file_offset == last_seen_offset)
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2007-09-20 07:56:14 +02:00
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{
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this->armap_checked_[i] = true;
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continue;
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}
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2007-09-25 19:50:26 +02:00
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if (this->seen_offsets_.find(this->armap_[i].file_offset)
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2007-09-20 07:56:14 +02:00
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!= this->seen_offsets_.end())
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2006-09-29 21:58:17 +02:00
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{
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2007-09-20 07:56:14 +02:00
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this->armap_checked_[i] = true;
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2007-09-25 19:50:26 +02:00
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last_seen_offset = this->armap_[i].file_offset;
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2006-09-29 21:58:17 +02:00
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continue;
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}
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2007-09-25 19:50:26 +02:00
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const char* sym_name = (this->armap_names_.data()
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|
|
+ this->armap_[i].name_offset);
|
|
|
|
Symbol* sym = symtab->lookup(sym_name);
|
2006-09-29 21:58:17 +02:00
|
|
|
if (sym == NULL)
|
|
|
|
continue;
|
2006-11-03 19:26:11 +01:00
|
|
|
else if (!sym->is_undefined())
|
2006-09-29 21:58:17 +02:00
|
|
|
{
|
2007-09-20 07:56:14 +02:00
|
|
|
this->armap_checked_[i] = true;
|
2006-09-29 21:58:17 +02:00
|
|
|
continue;
|
|
|
|
}
|
|
|
|
else if (sym->binding() == elfcpp::STB_WEAK)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
// We want to include this object in the link.
|
2007-09-25 19:50:26 +02:00
|
|
|
last_seen_offset = this->armap_[i].file_offset;
|
2007-09-20 07:56:14 +02:00
|
|
|
this->seen_offsets_.insert(last_seen_offset);
|
|
|
|
this->armap_checked_[i] = true;
|
2007-09-21 09:20:01 +02:00
|
|
|
this->include_member(symtab, layout, input_objects,
|
2007-09-20 07:56:14 +02:00
|
|
|
last_seen_offset);
|
2006-09-29 21:58:17 +02:00
|
|
|
added_new_object = true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
while (added_new_object);
|
|
|
|
}
|
|
|
|
|
2007-08-22 01:37:56 +02:00
|
|
|
// Include all the archive members in the link. This is for --whole-archive.
|
|
|
|
|
|
|
|
void
|
2007-09-21 09:20:01 +02:00
|
|
|
Archive::include_all_members(Symbol_table* symtab, Layout* layout,
|
2007-08-22 01:37:56 +02:00
|
|
|
Input_objects* input_objects)
|
|
|
|
{
|
|
|
|
off_t off = sarmag;
|
2007-09-25 08:43:17 +02:00
|
|
|
off_t filesize = this->input_file_->file().filesize();
|
2007-08-22 01:37:56 +02:00
|
|
|
while (true)
|
|
|
|
{
|
2007-10-02 22:52:18 +02:00
|
|
|
if (filesize - off < static_cast<off_t>(sizeof(Archive_header)))
|
2007-08-22 01:37:56 +02:00
|
|
|
{
|
2007-09-25 08:43:17 +02:00
|
|
|
if (filesize != off)
|
2007-10-14 08:49:14 +02:00
|
|
|
gold_error(_("%s: short archive header at %zu"),
|
|
|
|
this->name().c_str(), static_cast<size_t>(off));
|
2007-08-22 01:37:56 +02:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2007-09-25 08:43:17 +02:00
|
|
|
unsigned char hdr_buf[sizeof(Archive_header)];
|
|
|
|
this->input_file_->file().read(off, sizeof(Archive_header), hdr_buf);
|
|
|
|
|
2007-09-25 07:16:35 +02:00
|
|
|
const Archive_header* hdr =
|
|
|
|
reinterpret_cast<const Archive_header*>(hdr_buf);
|
2007-08-22 01:37:56 +02:00
|
|
|
std::string name;
|
|
|
|
off_t size = this->interpret_header(hdr, off, &name);
|
|
|
|
if (name.empty())
|
|
|
|
{
|
|
|
|
// Symbol table.
|
|
|
|
}
|
|
|
|
else if (name == "/")
|
|
|
|
{
|
|
|
|
// Extended name table.
|
|
|
|
}
|
|
|
|
else
|
2007-09-21 09:20:01 +02:00
|
|
|
this->include_member(symtab, layout, input_objects, off);
|
2007-08-22 01:37:56 +02:00
|
|
|
|
|
|
|
off += sizeof(Archive_header) + size;
|
|
|
|
if ((off & 1) != 0)
|
|
|
|
++off;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-09-29 21:58:17 +02:00
|
|
|
// Include an archive member in the link. OFF is the file offset of
|
|
|
|
// the member header.
|
|
|
|
|
|
|
|
void
|
2007-09-21 09:20:01 +02:00
|
|
|
Archive::include_member(Symbol_table* symtab, Layout* layout,
|
|
|
|
Input_objects* input_objects, off_t off)
|
2006-09-29 21:58:17 +02:00
|
|
|
{
|
|
|
|
std::string n;
|
2008-01-03 00:48:49 +01:00
|
|
|
this->read_header(off, false, &n);
|
2006-09-29 21:58:17 +02:00
|
|
|
|
2007-10-02 22:52:18 +02:00
|
|
|
const off_t memoff = off + static_cast<off_t>(sizeof(Archive_header));
|
2006-09-29 21:58:17 +02:00
|
|
|
|
|
|
|
// Read enough of the file to pick up the entire ELF header.
|
2007-09-25 08:43:17 +02:00
|
|
|
unsigned char ehdr_buf[elfcpp::Elf_sizes<64>::ehdr_size];
|
|
|
|
|
|
|
|
off_t filesize = this->input_file_->file().filesize();
|
|
|
|
int read_size = elfcpp::Elf_sizes<64>::ehdr_size;
|
|
|
|
if (filesize - memoff < read_size)
|
|
|
|
read_size = filesize - memoff;
|
|
|
|
|
|
|
|
if (read_size < 4)
|
2006-09-29 21:58:17 +02:00
|
|
|
{
|
2007-10-14 08:49:14 +02:00
|
|
|
gold_error(_("%s: member at %zu is not an ELF object"),
|
|
|
|
this->name().c_str(), static_cast<size_t>(off));
|
|
|
|
return;
|
2006-09-29 21:58:17 +02:00
|
|
|
}
|
|
|
|
|
2007-09-25 08:43:17 +02:00
|
|
|
this->input_file_->file().read(memoff, read_size, ehdr_buf);
|
|
|
|
|
2006-09-29 21:58:17 +02:00
|
|
|
static unsigned char elfmagic[4] =
|
|
|
|
{
|
|
|
|
elfcpp::ELFMAG0, elfcpp::ELFMAG1,
|
|
|
|
elfcpp::ELFMAG2, elfcpp::ELFMAG3
|
|
|
|
};
|
2007-09-25 07:16:35 +02:00
|
|
|
if (memcmp(ehdr_buf, elfmagic, 4) != 0)
|
2006-09-29 21:58:17 +02:00
|
|
|
{
|
2007-10-14 08:49:14 +02:00
|
|
|
gold_error(_("%s: member at %zu is not an ELF object"),
|
|
|
|
this->name().c_str(), static_cast<size_t>(off));
|
|
|
|
return;
|
2006-09-29 21:58:17 +02:00
|
|
|
}
|
|
|
|
|
2006-10-20 22:40:49 +02:00
|
|
|
Object* obj = make_elf_object((std::string(this->input_file_->filename())
|
2006-09-29 21:58:17 +02:00
|
|
|
+ "(" + n + ")"),
|
2007-09-25 08:43:17 +02:00
|
|
|
this->input_file_, memoff, ehdr_buf,
|
|
|
|
read_size);
|
2006-09-29 21:58:17 +02:00
|
|
|
|
2007-11-07 01:31:32 +01:00
|
|
|
if (input_objects->add_object(obj))
|
|
|
|
{
|
|
|
|
Read_symbols_data sd;
|
|
|
|
obj->read_symbols(&sd);
|
|
|
|
obj->layout(symtab, layout, &sd);
|
|
|
|
obj->add_symbols(symtab, &sd);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
// FIXME: We need to close the descriptor here.
|
|
|
|
delete obj;
|
|
|
|
}
|
2006-09-29 21:58:17 +02:00
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
// Add_archive_symbols methods.
|
|
|
|
|
|
|
|
Add_archive_symbols::~Add_archive_symbols()
|
|
|
|
{
|
|
|
|
if (this->this_blocker_ != NULL)
|
|
|
|
delete this->this_blocker_;
|
|
|
|
// next_blocker_ is deleted by the task associated with the next
|
|
|
|
// input file.
|
|
|
|
}
|
|
|
|
|
|
|
|
// Return whether we can add the archive symbols. We are blocked by
|
|
|
|
// this_blocker_. We block next_blocker_. We also lock the file.
|
|
|
|
|
2007-12-14 20:00:21 +01:00
|
|
|
Task_token*
|
|
|
|
Add_archive_symbols::is_runnable()
|
2006-09-29 21:58:17 +02:00
|
|
|
{
|
|
|
|
if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
|
2007-12-14 20:00:21 +01:00
|
|
|
return this->this_blocker_;
|
|
|
|
return NULL;
|
2006-09-29 21:58:17 +02:00
|
|
|
}
|
|
|
|
|
2007-12-14 20:00:21 +01:00
|
|
|
void
|
|
|
|
Add_archive_symbols::locks(Task_locker* tl)
|
2006-09-29 21:58:17 +02:00
|
|
|
{
|
2007-12-14 20:00:21 +01:00
|
|
|
tl->add(this, this->next_blocker_);
|
|
|
|
tl->add(this, this->archive_->token());
|
2006-09-29 21:58:17 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
Add_archive_symbols::run(Workqueue*)
|
|
|
|
{
|
2007-09-21 09:20:01 +02:00
|
|
|
this->archive_->add_symbols(this->symtab_, this->layout_,
|
|
|
|
this->input_objects_);
|
2006-11-03 19:26:11 +01:00
|
|
|
|
2007-12-14 20:00:21 +01:00
|
|
|
this->archive_->release();
|
|
|
|
|
2006-11-03 19:26:11 +01:00
|
|
|
if (this->input_group_ != NULL)
|
|
|
|
this->input_group_->add_archive(this->archive_);
|
|
|
|
else
|
|
|
|
{
|
|
|
|
// We no longer need to know about this archive.
|
|
|
|
delete this->archive_;
|
2007-11-22 01:05:51 +01:00
|
|
|
this->archive_ = NULL;
|
2006-11-03 19:26:11 +01:00
|
|
|
}
|
2006-09-29 21:58:17 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
} // End namespace gold.
|