2009-03-20 23:37:51 +00:00
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// inremental.cc -- incremental linking support for gold
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2010-08-12 22:01:11 +00:00
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// Copyright 2009, 2010 Free Software Foundation, Inc.
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2009-03-20 23:37:51 +00:00
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// Written by Mikolaj Zalewski <mikolajz@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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#include "gold.h"
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2009-10-09 16:40:51 +00:00
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#include <cstdarg>
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2010-03-05 22:04:48 +00:00
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#include "libiberty.h"
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2009-10-09 16:40:51 +00:00
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2009-03-20 23:37:51 +00:00
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#include "elfcpp.h"
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2009-04-24 15:44:02 +00:00
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#include "output.h"
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2010-08-12 22:01:11 +00:00
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#include "symtab.h"
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2009-04-24 15:44:02 +00:00
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#include "incremental.h"
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2009-07-06 23:11:21 +00:00
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#include "archive.h"
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2009-09-01 17:32:35 +00:00
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#include "output.h"
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2009-10-09 16:40:51 +00:00
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#include "target-select.h"
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2010-08-12 22:15:00 +00:00
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#include "target.h"
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2009-03-20 23:37:51 +00:00
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namespace gold {
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// Version information. Will change frequently during the development, later
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// we could think about backward (and forward?) compatibility.
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2009-10-09 22:38:07 +00:00
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const unsigned int INCREMENTAL_LINK_VERSION = 1;
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2009-03-20 23:37:51 +00:00
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2010-08-12 22:01:11 +00:00
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// This class manages the .gnu_incremental_inputs section, which holds
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// the header information, a directory of input files, and separate
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// entries for each input file.
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template<int size, bool big_endian>
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class Output_section_incremental_inputs : public Output_section_data
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{
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public:
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Output_section_incremental_inputs(const Incremental_inputs* inputs,
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const Symbol_table* symtab)
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: Output_section_data(size / 8), inputs_(inputs), symtab_(symtab)
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{ }
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protected:
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// Set the final data size.
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void
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set_final_data_size();
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// Write the data to the file.
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void
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do_write(Output_file*);
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// Write to a map file.
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void
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do_print_to_mapfile(Mapfile* mapfile) const
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{ mapfile->print_output_data(this, _("** incremental_inputs")); }
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private:
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// Write the section header.
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unsigned char*
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write_header(unsigned char* pov, unsigned int input_file_count,
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section_offset_type command_line_offset);
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// Write the input file entries.
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unsigned char*
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write_input_files(unsigned char* oview, unsigned char* pov,
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Stringpool* strtab);
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// Write the supplemental information blocks.
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unsigned char*
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write_info_blocks(unsigned char* oview, unsigned char* pov,
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Stringpool* strtab, unsigned int* global_syms,
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unsigned int global_sym_count);
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// Write the contents of the .gnu_incremental_symtab section.
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void
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write_symtab(unsigned char* pov, unsigned int* global_syms,
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unsigned int global_sym_count);
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2010-08-12 22:15:00 +00:00
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// Write the contents of the .gnu_incremental_got_plt section.
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void
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write_got_plt(unsigned char* pov, off_t view_size);
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2010-08-12 22:01:11 +00:00
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// Typedefs for writing the data to the output sections.
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typedef elfcpp::Swap<size, big_endian> Swap;
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typedef elfcpp::Swap<16, big_endian> Swap16;
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typedef elfcpp::Swap<32, big_endian> Swap32;
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typedef elfcpp::Swap<64, big_endian> Swap64;
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// Sizes of various structures.
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static const int sizeof_addr = size / 8;
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static const int header_size = 16;
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static const int input_entry_size = 24;
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// The Incremental_inputs object.
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const Incremental_inputs* inputs_;
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// The symbol table.
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const Symbol_table* symtab_;
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};
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2009-10-09 16:40:51 +00:00
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// Inform the user why we don't do an incremental link. Not called in
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// the obvious case of missing output file. TODO: Is this helpful?
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void
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vexplain_no_incremental(const char* format, va_list args)
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{
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char* buf = NULL;
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if (vasprintf(&buf, format, args) < 0)
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gold_nomem();
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gold_info(_("the link might take longer: "
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"cannot perform incremental link: %s"), buf);
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free(buf);
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}
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void
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explain_no_incremental(const char* format, ...)
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{
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va_list args;
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va_start(args, format);
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vexplain_no_incremental(format, args);
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va_end(args);
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}
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// Report an error.
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void
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Incremental_binary::error(const char* format, ...) const
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{
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va_list args;
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va_start(args, format);
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// Current code only checks if the file can be used for incremental linking,
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// so errors shouldn't fail the build, but only result in a fallback to a
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// full build.
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// TODO: when we implement incremental editing of the file, we may need a
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// flag that will cause errors to be treated seriously.
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vexplain_no_incremental(format, args);
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va_end(args);
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}
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2010-08-12 22:01:11 +00:00
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// Find the .gnu_incremental_inputs section and related sections.
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2009-10-09 16:40:51 +00:00
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template<int size, bool big_endian>
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bool
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2010-08-12 22:01:11 +00:00
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Sized_incremental_binary<size, big_endian>::do_find_incremental_inputs_sections(
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unsigned int* p_inputs_shndx,
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unsigned int* p_symtab_shndx,
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unsigned int* p_relocs_shndx,
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2010-08-12 22:15:00 +00:00
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unsigned int* p_got_plt_shndx,
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2010-08-12 22:01:11 +00:00
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unsigned int* p_strtab_shndx)
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2009-10-09 16:40:51 +00:00
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{
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2010-08-12 22:01:11 +00:00
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unsigned int inputs_shndx =
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this->elf_file_.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_INPUTS);
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if (inputs_shndx == elfcpp::SHN_UNDEF) // Not found.
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return false;
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unsigned int symtab_shndx =
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this->elf_file_.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_SYMTAB);
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if (symtab_shndx == elfcpp::SHN_UNDEF) // Not found.
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return false;
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if (this->elf_file_.section_link(symtab_shndx) != inputs_shndx)
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2009-10-09 16:40:51 +00:00
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return false;
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2010-08-12 22:01:11 +00:00
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unsigned int relocs_shndx =
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this->elf_file_.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_RELOCS);
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if (relocs_shndx == elfcpp::SHN_UNDEF) // Not found.
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return false;
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if (this->elf_file_.section_link(relocs_shndx) != inputs_shndx)
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return false;
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2010-08-12 22:15:00 +00:00
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unsigned int got_plt_shndx =
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this->elf_file_.find_section_by_type(elfcpp::SHT_GNU_INCREMENTAL_GOT_PLT);
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if (got_plt_shndx == elfcpp::SHN_UNDEF) // Not found.
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return false;
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if (this->elf_file_.section_link(got_plt_shndx) != inputs_shndx)
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return false;
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2010-08-12 22:01:11 +00:00
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unsigned int strtab_shndx = this->elf_file_.section_link(inputs_shndx);
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if (strtab_shndx == elfcpp::SHN_UNDEF
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|| strtab_shndx > this->elf_file_.shnum()
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|| this->elf_file_.section_type(strtab_shndx) != elfcpp::SHT_STRTAB)
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return false;
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if (p_inputs_shndx != NULL)
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*p_inputs_shndx = inputs_shndx;
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if (p_symtab_shndx != NULL)
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*p_symtab_shndx = symtab_shndx;
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if (p_relocs_shndx != NULL)
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*p_relocs_shndx = relocs_shndx;
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2010-08-12 22:15:00 +00:00
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if (p_got_plt_shndx != NULL)
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*p_got_plt_shndx = got_plt_shndx;
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2010-08-12 22:01:11 +00:00
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if (p_strtab_shndx != NULL)
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*p_strtab_shndx = strtab_shndx;
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2009-10-09 16:40:51 +00:00
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return true;
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}
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2010-08-12 22:01:11 +00:00
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// Determine whether an incremental link based on the existing output file
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// can be done.
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2009-10-09 22:38:07 +00:00
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template<int size, bool big_endian>
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bool
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Sized_incremental_binary<size, big_endian>::do_check_inputs(
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Incremental_inputs* incremental_inputs)
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{
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2010-08-12 22:01:11 +00:00
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unsigned int inputs_shndx;
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unsigned int symtab_shndx;
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unsigned int relocs_shndx;
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2010-08-12 22:15:00 +00:00
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unsigned int plt_got_shndx;
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2009-10-09 22:38:07 +00:00
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unsigned int strtab_shndx;
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2010-08-12 22:01:11 +00:00
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if (!do_find_incremental_inputs_sections(&inputs_shndx, &symtab_shndx,
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2010-08-12 22:15:00 +00:00
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&relocs_shndx, &plt_got_shndx,
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&strtab_shndx))
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2009-10-09 22:38:07 +00:00
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{
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explain_no_incremental(_("no incremental data from previous build"));
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return false;
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}
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2010-08-12 22:01:11 +00:00
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Location inputs_location(this->elf_file_.section_contents(inputs_shndx));
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Location symtab_location(this->elf_file_.section_contents(symtab_shndx));
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Location relocs_location(this->elf_file_.section_contents(relocs_shndx));
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2009-10-09 22:38:07 +00:00
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Location strtab_location(this->elf_file_.section_contents(strtab_shndx));
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2010-08-12 22:01:11 +00:00
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View inputs_view(view(inputs_location));
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View symtab_view(view(symtab_location));
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View relocs_view(view(relocs_location));
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2009-10-09 22:38:07 +00:00
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View strtab_view(view(strtab_location));
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2010-08-12 22:01:11 +00:00
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2009-10-09 22:38:07 +00:00
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elfcpp::Elf_strtab strtab(strtab_view.data(), strtab_location.data_size);
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2010-08-12 22:01:11 +00:00
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Incremental_inputs_reader<size, big_endian>
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incoming_inputs(inputs_view.data(), strtab);
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2009-10-09 22:38:07 +00:00
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2010-08-12 22:01:11 +00:00
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if (incoming_inputs.version() != INCREMENTAL_LINK_VERSION)
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2009-10-09 22:38:07 +00:00
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{
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2010-08-12 22:01:11 +00:00
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explain_no_incremental(_("different version of incremental build data"));
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2009-10-09 22:38:07 +00:00
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return false;
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}
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2010-08-12 22:01:11 +00:00
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if (incremental_inputs->command_line() != incoming_inputs.command_line())
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2009-10-09 22:38:07 +00:00
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{
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explain_no_incremental(_("command line changed"));
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return false;
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}
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// TODO: compare incremental_inputs->inputs() with entries in data_view.
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2010-08-12 22:01:11 +00:00
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2009-10-09 22:38:07 +00:00
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return true;
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}
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2009-10-09 16:40:51 +00:00
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namespace
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{
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// Create a Sized_incremental_binary object of the specified size and
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// endianness. Fails if the target architecture is not supported.
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template<int size, bool big_endian>
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Incremental_binary*
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make_sized_incremental_binary(Output_file* file,
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const elfcpp::Ehdr<size, big_endian>& ehdr)
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{
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Target* target = select_target(ehdr.get_e_machine(), size, big_endian,
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ehdr.get_e_ident()[elfcpp::EI_OSABI],
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ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]);
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if (target == NULL)
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{
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explain_no_incremental(_("unsupported ELF machine number %d"),
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ehdr.get_e_machine());
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return NULL;
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}
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2009-12-03 04:26:01 +00:00
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if (!parameters->target_valid())
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set_parameters_target(target);
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else if (target != ¶meters->target())
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gold_error(_("%s: incompatible target"), file->filename());
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2009-10-09 16:40:51 +00:00
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return new Sized_incremental_binary<size, big_endian>(file, ehdr, target);
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}
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} // End of anonymous namespace.
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2010-08-12 22:01:11 +00:00
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// Create an Incremental_binary object for FILE. Returns NULL is this is not
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// possible, e.g. FILE is not an ELF file or has an unsupported target. FILE
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2009-10-09 16:40:51 +00:00
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// should be opened.
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Incremental_binary*
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open_incremental_binary(Output_file* file)
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{
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off_t filesize = file->filesize();
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int want = elfcpp::Elf_recognizer::max_header_size;
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if (filesize < want)
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want = filesize;
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const unsigned char* p = file->get_input_view(0, want);
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if (!elfcpp::Elf_recognizer::is_elf_file(p, want))
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{
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explain_no_incremental(_("output is not an ELF file."));
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return NULL;
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}
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2009-11-09 23:07:30 +00:00
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int size = 0;
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bool big_endian = false;
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2009-10-09 16:40:51 +00:00
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std::string error;
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if (!elfcpp::Elf_recognizer::is_valid_header(p, want, &size, &big_endian,
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&error))
|
|
|
|
{
|
|
|
|
explain_no_incremental(error.c_str());
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
Incremental_binary* result = NULL;
|
|
|
|
if (size == 32)
|
|
|
|
{
|
|
|
|
if (big_endian)
|
|
|
|
{
|
|
|
|
#ifdef HAVE_TARGET_32_BIG
|
|
|
|
result = make_sized_incremental_binary<32, true>(
|
|
|
|
file, elfcpp::Ehdr<32, true>(p));
|
|
|
|
#else
|
|
|
|
explain_no_incremental(_("unsupported file: 32-bit, big-endian"));
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
#ifdef HAVE_TARGET_32_LITTLE
|
|
|
|
result = make_sized_incremental_binary<32, false>(
|
|
|
|
file, elfcpp::Ehdr<32, false>(p));
|
|
|
|
#else
|
|
|
|
explain_no_incremental(_("unsupported file: 32-bit, little-endian"));
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else if (size == 64)
|
|
|
|
{
|
|
|
|
if (big_endian)
|
|
|
|
{
|
|
|
|
#ifdef HAVE_TARGET_64_BIG
|
|
|
|
result = make_sized_incremental_binary<64, true>(
|
|
|
|
file, elfcpp::Ehdr<64, true>(p));
|
|
|
|
#else
|
|
|
|
explain_no_incremental(_("unsupported file: 64-bit, big-endian"));
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
#ifdef HAVE_TARGET_64_LITTLE
|
|
|
|
result = make_sized_incremental_binary<64, false>(
|
|
|
|
file, elfcpp::Ehdr<64, false>(p));
|
|
|
|
#else
|
|
|
|
explain_no_incremental(_("unsupported file: 64-bit, little-endian"));
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else
|
|
|
|
gold_unreachable();
|
|
|
|
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
2009-09-01 17:32:35 +00:00
|
|
|
// Analyzes the output file to check if incremental linking is possible and
|
|
|
|
// (to be done) what files need to be relinked.
|
|
|
|
|
|
|
|
bool
|
|
|
|
Incremental_checker::can_incrementally_link_output_file()
|
|
|
|
{
|
|
|
|
Output_file output(this->output_name_);
|
|
|
|
if (!output.open_for_modification())
|
|
|
|
return false;
|
2009-10-09 16:40:51 +00:00
|
|
|
Incremental_binary* binary = open_incremental_binary(&output);
|
|
|
|
if (binary == NULL)
|
|
|
|
return false;
|
2009-10-09 22:38:07 +00:00
|
|
|
return binary->check_inputs(this->incremental_inputs_);
|
2009-09-01 17:32:35 +00:00
|
|
|
}
|
|
|
|
|
2010-08-12 22:01:11 +00:00
|
|
|
// Class Incremental_inputs.
|
|
|
|
|
2009-04-24 15:44:02 +00:00
|
|
|
// Add the command line to the string table, setting
|
|
|
|
// command_line_key_. In incremental builds, the command line is
|
|
|
|
// stored in .gnu_incremental_inputs so that the next linker run can
|
|
|
|
// check if the command line options didn't change.
|
|
|
|
|
|
|
|
void
|
|
|
|
Incremental_inputs::report_command_line(int argc, const char* const* argv)
|
|
|
|
{
|
|
|
|
// Always store 'gold' as argv[0] to avoid a full relink if the user used a
|
|
|
|
// different path to the linker.
|
|
|
|
std::string args("gold");
|
|
|
|
// Copied from collect_argv in main.cc.
|
|
|
|
for (int i = 1; i < argc; ++i)
|
|
|
|
{
|
2010-08-12 22:01:11 +00:00
|
|
|
// Adding/removing these options should not result in a full relink.
|
2009-05-31 23:07:26 +00:00
|
|
|
if (strcmp(argv[i], "--incremental-changed") == 0
|
|
|
|
|| strcmp(argv[i], "--incremental-unchanged") == 0
|
|
|
|
|| strcmp(argv[i], "--incremental-unknown") == 0)
|
|
|
|
continue;
|
|
|
|
|
2009-04-24 15:44:02 +00:00
|
|
|
args.append(" '");
|
|
|
|
// Now append argv[i], but with all single-quotes escaped
|
|
|
|
const char* argpos = argv[i];
|
|
|
|
while (1)
|
|
|
|
{
|
|
|
|
const int len = strcspn(argpos, "'");
|
|
|
|
args.append(argpos, len);
|
|
|
|
if (argpos[len] == '\0')
|
|
|
|
break;
|
|
|
|
args.append("'\"'\"'");
|
|
|
|
argpos += len + 1;
|
|
|
|
}
|
|
|
|
args.append("'");
|
|
|
|
}
|
2009-10-09 22:38:07 +00:00
|
|
|
|
|
|
|
this->command_line_ = args;
|
|
|
|
this->strtab_->add(this->command_line_.c_str(), false,
|
|
|
|
&this->command_line_key_);
|
2009-04-24 15:44:02 +00:00
|
|
|
}
|
|
|
|
|
2010-08-12 22:01:11 +00:00
|
|
|
// Record the input archive file ARCHIVE. This is called by the
|
|
|
|
// Add_archive_symbols task before determining which archive members
|
|
|
|
// to include. We create the Incremental_archive_entry here and
|
|
|
|
// attach it to the Archive, but we do not add it to the list of
|
|
|
|
// input objects until report_archive_end is called.
|
2009-05-15 17:01:04 +00:00
|
|
|
|
|
|
|
void
|
2010-08-12 22:01:11 +00:00
|
|
|
Incremental_inputs::report_archive_begin(Archive* arch)
|
2009-05-15 17:01:04 +00:00
|
|
|
{
|
2010-08-12 22:01:11 +00:00
|
|
|
Stringpool::Key filename_key;
|
|
|
|
Timespec mtime = arch->file().get_mtime();
|
2009-05-15 17:01:04 +00:00
|
|
|
|
2010-08-12 22:01:11 +00:00
|
|
|
this->strtab_->add(arch->filename().c_str(), false, &filename_key);
|
|
|
|
Incremental_archive_entry* entry =
|
|
|
|
new Incremental_archive_entry(filename_key, arch, mtime);
|
|
|
|
arch->set_incremental_info(entry);
|
2009-05-15 17:01:04 +00:00
|
|
|
}
|
|
|
|
|
2010-08-12 22:01:11 +00:00
|
|
|
// Finish recording the input archive file ARCHIVE. This is called by the
|
|
|
|
// Add_archive_symbols task after determining which archive members
|
|
|
|
// to include.
|
2009-05-15 17:01:04 +00:00
|
|
|
|
|
|
|
void
|
2010-08-12 22:01:11 +00:00
|
|
|
Incremental_inputs::report_archive_end(Archive* arch)
|
2009-05-15 17:01:04 +00:00
|
|
|
{
|
2010-08-12 22:01:11 +00:00
|
|
|
Incremental_archive_entry* entry = arch->incremental_info();
|
|
|
|
|
|
|
|
gold_assert(entry != NULL);
|
|
|
|
|
|
|
|
// Collect unused global symbols.
|
|
|
|
for (Archive::Unused_symbol_iterator p = arch->unused_symbols_begin();
|
|
|
|
p != arch->unused_symbols_end();
|
|
|
|
++p)
|
|
|
|
{
|
|
|
|
Stringpool::Key symbol_key;
|
|
|
|
this->strtab_->add(*p, true, &symbol_key);
|
|
|
|
entry->add_unused_global_symbol(symbol_key);
|
|
|
|
}
|
|
|
|
this->inputs_.push_back(entry);
|
2009-05-15 17:01:04 +00:00
|
|
|
}
|
|
|
|
|
2010-08-12 22:01:11 +00:00
|
|
|
// Record the input object file OBJ. If ARCH is not NULL, attach
|
|
|
|
// the object file to the archive. This is called by the
|
|
|
|
// Add_symbols task after finding out the type of the file.
|
2009-05-15 17:01:04 +00:00
|
|
|
|
|
|
|
void
|
2010-08-12 22:01:11 +00:00
|
|
|
Incremental_inputs::report_object(Object* obj, Archive* arch)
|
2009-05-15 17:01:04 +00:00
|
|
|
{
|
2010-08-12 22:01:11 +00:00
|
|
|
Stringpool::Key filename_key;
|
|
|
|
Timespec mtime = obj->input_file()->file().get_mtime();
|
|
|
|
|
|
|
|
this->strtab_->add(obj->name().c_str(), false, &filename_key);
|
|
|
|
Incremental_object_entry* obj_entry =
|
|
|
|
new Incremental_object_entry(filename_key, obj, mtime);
|
|
|
|
this->inputs_.push_back(obj_entry);
|
2009-05-15 17:01:04 +00:00
|
|
|
|
2010-08-12 22:01:11 +00:00
|
|
|
if (arch != NULL)
|
|
|
|
{
|
|
|
|
Incremental_archive_entry* arch_entry = arch->incremental_info();
|
|
|
|
gold_assert(arch_entry != NULL);
|
|
|
|
arch_entry->add_object(obj_entry);
|
|
|
|
}
|
|
|
|
|
|
|
|
this->current_object_ = obj;
|
|
|
|
this->current_object_entry_ = obj_entry;
|
2009-05-15 17:01:04 +00:00
|
|
|
}
|
|
|
|
|
2010-08-12 22:01:11 +00:00
|
|
|
// Record the input object file OBJ. If ARCH is not NULL, attach
|
|
|
|
// the object file to the archive. This is called by the
|
|
|
|
// Add_symbols task after finding out the type of the file.
|
2009-05-15 17:01:04 +00:00
|
|
|
|
|
|
|
void
|
2010-08-12 22:01:11 +00:00
|
|
|
Incremental_inputs::report_input_section(Object* obj, unsigned int shndx,
|
|
|
|
const char* name, off_t sh_size)
|
2009-05-15 17:01:04 +00:00
|
|
|
{
|
2010-08-12 22:01:11 +00:00
|
|
|
Stringpool::Key key = 0;
|
2009-05-15 17:01:04 +00:00
|
|
|
|
2010-08-12 22:01:11 +00:00
|
|
|
if (name != NULL)
|
|
|
|
this->strtab_->add(name, true, &key);
|
|
|
|
|
|
|
|
gold_assert(obj == this->current_object_);
|
|
|
|
this->current_object_entry_->add_input_section(shndx, key, sh_size);
|
|
|
|
}
|
|
|
|
|
|
|
|
// Record that the input argument INPUT is a script SCRIPT. This is
|
|
|
|
// called by read_script after parsing the script and reading the list
|
|
|
|
// of inputs added by this script.
|
|
|
|
|
|
|
|
void
|
|
|
|
Incremental_inputs::report_script(const std::string& filename,
|
|
|
|
Script_info* script, Timespec mtime)
|
|
|
|
{
|
|
|
|
Stringpool::Key filename_key;
|
|
|
|
|
|
|
|
this->strtab_->add(filename.c_str(), false, &filename_key);
|
|
|
|
Incremental_script_entry* entry =
|
|
|
|
new Incremental_script_entry(filename_key, script, mtime);
|
|
|
|
this->inputs_.push_back(entry);
|
2009-05-15 17:01:04 +00:00
|
|
|
}
|
|
|
|
|
2009-04-24 15:44:02 +00:00
|
|
|
// Finalize the incremental link information. Called from
|
|
|
|
// Layout::finalize.
|
|
|
|
|
|
|
|
void
|
|
|
|
Incremental_inputs::finalize()
|
|
|
|
{
|
2010-08-12 22:01:11 +00:00
|
|
|
// Finalize the string table.
|
2009-04-24 15:44:02 +00:00
|
|
|
this->strtab_->set_string_offsets();
|
|
|
|
}
|
|
|
|
|
2010-08-12 22:01:11 +00:00
|
|
|
// Create the .gnu_incremental_inputs, _symtab, and _relocs input sections.
|
2009-04-24 15:44:02 +00:00
|
|
|
|
2010-08-12 22:01:11 +00:00
|
|
|
void
|
|
|
|
Incremental_inputs::create_data_sections(Symbol_table* symtab)
|
2009-04-24 15:44:02 +00:00
|
|
|
{
|
|
|
|
switch (parameters->size_and_endianness())
|
|
|
|
{
|
|
|
|
#ifdef HAVE_TARGET_32_LITTLE
|
|
|
|
case Parameters::TARGET_32_LITTLE:
|
2010-08-12 22:01:11 +00:00
|
|
|
this->inputs_section_ =
|
|
|
|
new Output_section_incremental_inputs<32, false>(this, symtab);
|
|
|
|
break;
|
2009-04-24 15:44:02 +00:00
|
|
|
#endif
|
|
|
|
#ifdef HAVE_TARGET_32_BIG
|
|
|
|
case Parameters::TARGET_32_BIG:
|
2010-08-12 22:01:11 +00:00
|
|
|
this->inputs_section_ =
|
|
|
|
new Output_section_incremental_inputs<32, true>(this, symtab);
|
|
|
|
break;
|
2009-04-24 15:44:02 +00:00
|
|
|
#endif
|
|
|
|
#ifdef HAVE_TARGET_64_LITTLE
|
|
|
|
case Parameters::TARGET_64_LITTLE:
|
2010-08-12 22:01:11 +00:00
|
|
|
this->inputs_section_ =
|
|
|
|
new Output_section_incremental_inputs<64, false>(this, symtab);
|
|
|
|
break;
|
2009-04-24 15:44:02 +00:00
|
|
|
#endif
|
|
|
|
#ifdef HAVE_TARGET_64_BIG
|
|
|
|
case Parameters::TARGET_64_BIG:
|
2010-08-12 22:01:11 +00:00
|
|
|
this->inputs_section_ =
|
|
|
|
new Output_section_incremental_inputs<64, true>(this, symtab);
|
|
|
|
break;
|
2009-04-24 15:44:02 +00:00
|
|
|
#endif
|
|
|
|
default:
|
|
|
|
gold_unreachable();
|
2009-05-15 17:01:04 +00:00
|
|
|
}
|
2010-08-12 22:01:11 +00:00
|
|
|
this->symtab_section_ = new Output_data_space(4, "** incremental_symtab");
|
|
|
|
this->relocs_section_ = new Output_data_space(4, "** incremental_relocs");
|
2010-08-12 22:15:00 +00:00
|
|
|
this->got_plt_section_ = new Output_data_space(4, "** incremental_got_plt");
|
2009-04-24 15:44:02 +00:00
|
|
|
}
|
|
|
|
|
2010-08-12 22:01:11 +00:00
|
|
|
// Return the sh_entsize value for the .gnu_incremental_relocs section.
|
|
|
|
unsigned int
|
|
|
|
Incremental_inputs::relocs_entsize() const
|
|
|
|
{
|
|
|
|
return 8 + 2 * parameters->target().get_size() / 8;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Class Output_section_incremental_inputs.
|
|
|
|
|
|
|
|
// Finalize the offsets for each input section and supplemental info block,
|
|
|
|
// and set the final data size of the incremental output sections.
|
2009-04-24 15:44:02 +00:00
|
|
|
|
|
|
|
template<int size, bool big_endian>
|
2010-08-12 22:01:11 +00:00
|
|
|
void
|
|
|
|
Output_section_incremental_inputs<size, big_endian>::set_final_data_size()
|
2009-05-15 17:01:04 +00:00
|
|
|
{
|
2010-08-12 22:01:11 +00:00
|
|
|
const Incremental_inputs* inputs = this->inputs_;
|
|
|
|
const unsigned int sizeof_addr = size / 8;
|
|
|
|
const unsigned int rel_size = 8 + 2 * sizeof_addr;
|
|
|
|
|
|
|
|
// Offset of each input entry.
|
|
|
|
unsigned int input_offset = this->header_size;
|
|
|
|
|
|
|
|
// Offset of each supplemental info block.
|
|
|
|
unsigned int info_offset = this->header_size;
|
|
|
|
info_offset += this->input_entry_size * inputs->input_file_count();
|
|
|
|
|
|
|
|
// Count each input file and its supplemental information block.
|
|
|
|
for (Incremental_inputs::Input_list::const_iterator p =
|
|
|
|
inputs->input_files().begin();
|
|
|
|
p != inputs->input_files().end();
|
|
|
|
++p)
|
2009-05-15 17:01:04 +00:00
|
|
|
{
|
2010-08-12 22:01:11 +00:00
|
|
|
// Set the offset of the input file entry.
|
|
|
|
(*p)->set_offset(input_offset);
|
|
|
|
input_offset += this->input_entry_size;
|
|
|
|
|
|
|
|
// Set the offset of the supplemental info block.
|
|
|
|
switch ((*p)->type())
|
|
|
|
{
|
|
|
|
case INCREMENTAL_INPUT_SCRIPT:
|
|
|
|
// No supplemental info for a script.
|
|
|
|
(*p)->set_info_offset(0);
|
|
|
|
break;
|
|
|
|
case INCREMENTAL_INPUT_OBJECT:
|
|
|
|
case INCREMENTAL_INPUT_ARCHIVE_MEMBER:
|
|
|
|
{
|
2010-08-25 08:36:54 +00:00
|
|
|
Incremental_object_entry* entry = (*p)->object_entry();
|
2010-08-12 22:01:11 +00:00
|
|
|
gold_assert(entry != NULL);
|
|
|
|
(*p)->set_info_offset(info_offset);
|
|
|
|
// Input section count + global symbol count.
|
|
|
|
info_offset += 8;
|
|
|
|
// Each input section.
|
|
|
|
info_offset += (entry->get_input_section_count()
|
|
|
|
* (8 + 2 * sizeof_addr));
|
|
|
|
// Each global symbol.
|
|
|
|
const Object::Symbols* syms = entry->object()->get_global_symbols();
|
|
|
|
info_offset += syms->size() * 16;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case INCREMENTAL_INPUT_SHARED_LIBRARY:
|
|
|
|
{
|
2010-08-25 08:36:54 +00:00
|
|
|
Incremental_object_entry* entry = (*p)->object_entry();
|
2010-08-12 22:01:11 +00:00
|
|
|
gold_assert(entry != NULL);
|
|
|
|
(*p)->set_info_offset(info_offset);
|
|
|
|
// Global symbol count.
|
|
|
|
info_offset += 4;
|
|
|
|
// Each global symbol.
|
|
|
|
const Object::Symbols* syms = entry->object()->get_global_symbols();
|
|
|
|
unsigned int nsyms = syms != NULL ? syms->size() : 0;
|
|
|
|
info_offset += nsyms * 4;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case INCREMENTAL_INPUT_ARCHIVE:
|
|
|
|
{
|
2010-08-25 08:36:54 +00:00
|
|
|
Incremental_archive_entry* entry = (*p)->archive_entry();
|
2010-08-12 22:01:11 +00:00
|
|
|
gold_assert(entry != NULL);
|
|
|
|
(*p)->set_info_offset(info_offset);
|
|
|
|
// Member count + unused global symbol count.
|
|
|
|
info_offset += 8;
|
|
|
|
// Each member.
|
|
|
|
info_offset += (entry->get_member_count() * 4);
|
|
|
|
// Each global symbol.
|
|
|
|
info_offset += (entry->get_unused_global_symbol_count() * 4);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
gold_unreachable();
|
|
|
|
}
|
2009-05-15 17:01:04 +00:00
|
|
|
}
|
|
|
|
|
2010-08-12 22:01:11 +00:00
|
|
|
this->set_data_size(info_offset);
|
|
|
|
|
|
|
|
// Set the size of the .gnu_incremental_symtab section.
|
|
|
|
inputs->symtab_section()->set_current_data_size(this->symtab_->output_count()
|
|
|
|
* sizeof(unsigned int));
|
|
|
|
|
|
|
|
// Set the size of the .gnu_incremental_relocs section.
|
|
|
|
inputs->relocs_section()->set_current_data_size(inputs->get_reloc_count()
|
|
|
|
* rel_size);
|
2010-08-12 22:15:00 +00:00
|
|
|
|
|
|
|
// Set the size of the .gnu_incremental_got_plt section.
|
|
|
|
Sized_target<size, big_endian>* target =
|
|
|
|
parameters->sized_target<size, big_endian>();
|
|
|
|
unsigned int got_count = target->got_entry_count();
|
|
|
|
unsigned int plt_count = target->plt_entry_count();
|
|
|
|
unsigned int got_plt_size = 8; // GOT entry count, PLT entry count.
|
|
|
|
got_plt_size = (got_plt_size + got_count + 3) & ~3; // GOT type array.
|
|
|
|
got_plt_size += got_count * 4 + plt_count * 4; // GOT array, PLT array.
|
|
|
|
inputs->got_plt_section()->set_current_data_size(got_plt_size);
|
2010-08-12 22:01:11 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// Write the contents of the .gnu_incremental_inputs and
|
|
|
|
// .gnu_incremental_symtab sections.
|
|
|
|
|
|
|
|
template<int size, bool big_endian>
|
|
|
|
void
|
|
|
|
Output_section_incremental_inputs<size, big_endian>::do_write(Output_file* of)
|
|
|
|
{
|
|
|
|
const Incremental_inputs* inputs = this->inputs_;
|
|
|
|
Stringpool* strtab = inputs->get_stringpool();
|
|
|
|
|
|
|
|
// Get a view into the .gnu_incremental_inputs section.
|
|
|
|
const off_t off = this->offset();
|
|
|
|
const off_t oview_size = this->data_size();
|
|
|
|
unsigned char* const oview = of->get_output_view(off, oview_size);
|
|
|
|
unsigned char* pov = oview;
|
|
|
|
|
|
|
|
// Get a view into the .gnu_incremental_symtab section.
|
|
|
|
const off_t symtab_off = inputs->symtab_section()->offset();
|
|
|
|
const off_t symtab_size = inputs->symtab_section()->data_size();
|
|
|
|
unsigned char* const symtab_view = of->get_output_view(symtab_off,
|
|
|
|
symtab_size);
|
|
|
|
|
|
|
|
// Allocate an array of linked list heads for the .gnu_incremental_symtab
|
|
|
|
// section. Each element corresponds to a global symbol in the output
|
|
|
|
// symbol table, and points to the head of the linked list that threads
|
|
|
|
// through the object file input entries. The value of each element
|
|
|
|
// is the section-relative offset to a global symbol entry in a
|
|
|
|
// supplemental information block.
|
|
|
|
unsigned int global_sym_count = this->symtab_->output_count();
|
|
|
|
unsigned int* global_syms = new unsigned int[global_sym_count];
|
|
|
|
memset(global_syms, 0, global_sym_count * sizeof(unsigned int));
|
|
|
|
|
|
|
|
// Write the section header.
|
|
|
|
Stringpool::Key command_line_key = inputs->command_line_key();
|
|
|
|
pov = this->write_header(pov, inputs->input_file_count(),
|
|
|
|
strtab->get_offset_from_key(command_line_key));
|
|
|
|
|
|
|
|
// Write the list of input files.
|
|
|
|
pov = this->write_input_files(oview, pov, strtab);
|
|
|
|
|
|
|
|
// Write the supplemental information blocks for each input file.
|
|
|
|
pov = this->write_info_blocks(oview, pov, strtab, global_syms,
|
|
|
|
global_sym_count);
|
|
|
|
|
|
|
|
gold_assert(pov - oview == oview_size);
|
|
|
|
|
|
|
|
// Write the .gnu_incremental_symtab section.
|
|
|
|
gold_assert(global_sym_count * 4 == symtab_size);
|
|
|
|
this->write_symtab(symtab_view, global_syms, global_sym_count);
|
|
|
|
|
|
|
|
delete[] global_syms;
|
|
|
|
|
2010-08-12 22:15:00 +00:00
|
|
|
// Write the .gnu_incremental_got_plt section.
|
|
|
|
const off_t got_plt_off = inputs->got_plt_section()->offset();
|
|
|
|
const off_t got_plt_size = inputs->got_plt_section()->data_size();
|
|
|
|
unsigned char* const got_plt_view = of->get_output_view(got_plt_off,
|
|
|
|
got_plt_size);
|
|
|
|
this->write_got_plt(got_plt_view, got_plt_size);
|
|
|
|
|
2010-08-12 22:01:11 +00:00
|
|
|
of->write_output_view(off, oview_size, oview);
|
|
|
|
of->write_output_view(symtab_off, symtab_size, symtab_view);
|
2010-08-12 22:15:00 +00:00
|
|
|
of->write_output_view(got_plt_off, got_plt_size, got_plt_view);
|
2010-08-12 22:01:11 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// Write the section header: version, input file count, offset of command line
|
|
|
|
// in the string table, and 4 bytes of padding.
|
|
|
|
|
|
|
|
template<int size, bool big_endian>
|
|
|
|
unsigned char*
|
|
|
|
Output_section_incremental_inputs<size, big_endian>::write_header(
|
|
|
|
unsigned char* pov,
|
|
|
|
unsigned int input_file_count,
|
|
|
|
section_offset_type command_line_offset)
|
|
|
|
{
|
|
|
|
Swap32::writeval(pov, INCREMENTAL_LINK_VERSION);
|
|
|
|
Swap32::writeval(pov + 4, input_file_count);
|
|
|
|
Swap32::writeval(pov + 8, command_line_offset);
|
|
|
|
Swap32::writeval(pov + 12, 0);
|
|
|
|
return pov + this->header_size;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Write the input file entries.
|
|
|
|
|
|
|
|
template<int size, bool big_endian>
|
|
|
|
unsigned char*
|
|
|
|
Output_section_incremental_inputs<size, big_endian>::write_input_files(
|
|
|
|
unsigned char* oview,
|
|
|
|
unsigned char* pov,
|
|
|
|
Stringpool* strtab)
|
|
|
|
{
|
|
|
|
const Incremental_inputs* inputs = this->inputs_;
|
|
|
|
|
|
|
|
for (Incremental_inputs::Input_list::const_iterator p =
|
|
|
|
inputs->input_files().begin();
|
|
|
|
p != inputs->input_files().end();
|
|
|
|
++p)
|
|
|
|
{
|
2010-08-19 00:02:18 +00:00
|
|
|
gold_assert(static_cast<unsigned int>(pov - oview) == (*p)->get_offset());
|
2010-08-12 22:01:11 +00:00
|
|
|
section_offset_type filename_offset =
|
|
|
|
strtab->get_offset_from_key((*p)->get_filename_key());
|
|
|
|
const Timespec& mtime = (*p)->get_mtime();
|
|
|
|
Swap32::writeval(pov, filename_offset);
|
|
|
|
Swap32::writeval(pov + 4, (*p)->get_info_offset());
|
|
|
|
Swap64::writeval(pov + 8, mtime.seconds);
|
|
|
|
Swap32::writeval(pov + 16, mtime.nanoseconds);
|
|
|
|
Swap16::writeval(pov + 20, (*p)->type());
|
|
|
|
Swap16::writeval(pov + 22, 0);
|
|
|
|
pov += this->input_entry_size;
|
|
|
|
}
|
|
|
|
return pov;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Write the supplemental information blocks.
|
|
|
|
|
|
|
|
template<int size, bool big_endian>
|
|
|
|
unsigned char*
|
|
|
|
Output_section_incremental_inputs<size, big_endian>::write_info_blocks(
|
|
|
|
unsigned char* oview,
|
|
|
|
unsigned char* pov,
|
|
|
|
Stringpool* strtab,
|
|
|
|
unsigned int* global_syms,
|
|
|
|
unsigned int global_sym_count)
|
|
|
|
{
|
|
|
|
const Incremental_inputs* inputs = this->inputs_;
|
|
|
|
unsigned int first_global_index = this->symtab_->first_global_index();
|
|
|
|
|
|
|
|
for (Incremental_inputs::Input_list::const_iterator p =
|
|
|
|
inputs->input_files().begin();
|
|
|
|
p != inputs->input_files().end();
|
|
|
|
++p)
|
|
|
|
{
|
|
|
|
switch ((*p)->type())
|
|
|
|
{
|
|
|
|
case INCREMENTAL_INPUT_SCRIPT:
|
|
|
|
// No supplemental info for a script.
|
|
|
|
break;
|
|
|
|
|
|
|
|
case INCREMENTAL_INPUT_OBJECT:
|
|
|
|
case INCREMENTAL_INPUT_ARCHIVE_MEMBER:
|
|
|
|
{
|
2010-08-19 00:02:18 +00:00
|
|
|
gold_assert(static_cast<unsigned int>(pov - oview)
|
|
|
|
== (*p)->get_info_offset());
|
2010-08-12 22:01:11 +00:00
|
|
|
Incremental_object_entry* entry = (*p)->object_entry();
|
|
|
|
gold_assert(entry != NULL);
|
|
|
|
const Object* obj = entry->object();
|
|
|
|
const Object::Symbols* syms = obj->get_global_symbols();
|
|
|
|
// Write the input section count and global symbol count.
|
|
|
|
unsigned int nsections = entry->get_input_section_count();
|
|
|
|
unsigned int nsyms = syms->size();
|
|
|
|
Swap32::writeval(pov, nsections);
|
|
|
|
Swap32::writeval(pov + 4, nsyms);
|
|
|
|
pov += 8;
|
|
|
|
|
|
|
|
// For each input section, write the name, output section index,
|
|
|
|
// offset within output section, and input section size.
|
|
|
|
for (unsigned int i = 0; i < nsections; i++)
|
|
|
|
{
|
|
|
|
Stringpool::Key key = entry->get_input_section_name_key(i);
|
|
|
|
off_t name_offset = 0;
|
|
|
|
if (key != 0)
|
|
|
|
name_offset = strtab->get_offset_from_key(key);
|
|
|
|
int out_shndx = 0;
|
|
|
|
off_t out_offset = 0;
|
|
|
|
off_t sh_size = 0;
|
|
|
|
Output_section* os = obj->output_section(i);
|
|
|
|
if (os != NULL)
|
|
|
|
{
|
|
|
|
out_shndx = os->out_shndx();
|
|
|
|
out_offset = obj->output_section_offset(i);
|
|
|
|
sh_size = entry->get_input_section_size(i);
|
|
|
|
}
|
|
|
|
Swap32::writeval(pov, name_offset);
|
|
|
|
Swap32::writeval(pov + 4, out_shndx);
|
|
|
|
Swap::writeval(pov + 8, out_offset);
|
|
|
|
Swap::writeval(pov + 8 + sizeof_addr, sh_size);
|
|
|
|
pov += 8 + 2 * sizeof_addr;
|
|
|
|
}
|
|
|
|
|
|
|
|
// For each global symbol, write its associated relocations,
|
|
|
|
// add it to the linked list of globals, then write the
|
|
|
|
// supplemental information: global symbol table index,
|
|
|
|
// linked list chain pointer, relocation count, and offset
|
|
|
|
// to the relocations.
|
|
|
|
for (unsigned int i = 0; i < nsyms; i++)
|
|
|
|
{
|
|
|
|
const Symbol* sym = (*syms)[i];
|
|
|
|
unsigned int symtab_index = sym->symtab_index();
|
|
|
|
unsigned int chain = 0;
|
|
|
|
unsigned int first_reloc = 0;
|
|
|
|
unsigned int nrelocs = obj->get_incremental_reloc_count(i);
|
|
|
|
if (nrelocs > 0)
|
|
|
|
{
|
|
|
|
gold_assert(symtab_index != -1U
|
|
|
|
&& (symtab_index - first_global_index
|
|
|
|
< global_sym_count));
|
|
|
|
first_reloc = obj->get_incremental_reloc_base(i);
|
|
|
|
chain = global_syms[symtab_index - first_global_index];
|
|
|
|
global_syms[symtab_index - first_global_index] =
|
|
|
|
pov - oview;
|
|
|
|
}
|
|
|
|
Swap32::writeval(pov, symtab_index);
|
|
|
|
Swap32::writeval(pov + 4, chain);
|
|
|
|
Swap32::writeval(pov + 8, nrelocs);
|
|
|
|
Swap32::writeval(pov + 12, first_reloc * 3 * sizeof_addr);
|
|
|
|
pov += 16;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
case INCREMENTAL_INPUT_SHARED_LIBRARY:
|
|
|
|
{
|
2010-08-19 00:02:18 +00:00
|
|
|
gold_assert(static_cast<unsigned int>(pov - oview)
|
|
|
|
== (*p)->get_info_offset());
|
2010-08-12 22:01:11 +00:00
|
|
|
Incremental_object_entry* entry = (*p)->object_entry();
|
|
|
|
gold_assert(entry != NULL);
|
|
|
|
const Object* obj = entry->object();
|
|
|
|
const Object::Symbols* syms = obj->get_global_symbols();
|
|
|
|
|
|
|
|
// Write the global symbol count.
|
|
|
|
unsigned int nsyms = syms != NULL ? syms->size() : 0;
|
|
|
|
Swap32::writeval(pov, nsyms);
|
|
|
|
pov += 4;
|
|
|
|
|
|
|
|
// For each global symbol, write the global symbol table index.
|
|
|
|
for (unsigned int i = 0; i < nsyms; i++)
|
|
|
|
{
|
|
|
|
const Symbol* sym = (*syms)[i];
|
|
|
|
Swap32::writeval(pov, sym->symtab_index());
|
|
|
|
pov += 4;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
case INCREMENTAL_INPUT_ARCHIVE:
|
|
|
|
{
|
2010-08-19 00:02:18 +00:00
|
|
|
gold_assert(static_cast<unsigned int>(pov - oview)
|
|
|
|
== (*p)->get_info_offset());
|
2010-08-12 22:01:11 +00:00
|
|
|
Incremental_archive_entry* entry = (*p)->archive_entry();
|
|
|
|
gold_assert(entry != NULL);
|
|
|
|
|
|
|
|
// Write the member count and unused global symbol count.
|
|
|
|
unsigned int nmembers = entry->get_member_count();
|
|
|
|
unsigned int nsyms = entry->get_unused_global_symbol_count();
|
|
|
|
Swap32::writeval(pov, nmembers);
|
|
|
|
Swap32::writeval(pov + 4, nsyms);
|
|
|
|
pov += 8;
|
|
|
|
|
|
|
|
// For each member, write the offset to its input file entry.
|
|
|
|
for (unsigned int i = 0; i < nmembers; ++i)
|
|
|
|
{
|
|
|
|
Incremental_object_entry* member = entry->get_member(i);
|
|
|
|
Swap32::writeval(pov, member->get_offset());
|
|
|
|
pov += 4;
|
|
|
|
}
|
|
|
|
|
|
|
|
// For each global symbol, write the name offset.
|
|
|
|
for (unsigned int i = 0; i < nsyms; ++i)
|
|
|
|
{
|
|
|
|
Stringpool::Key key = entry->get_unused_global_symbol(i);
|
|
|
|
Swap32::writeval(pov, strtab->get_offset_from_key(key));
|
|
|
|
pov += 4;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
gold_unreachable();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return pov;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Write the contents of the .gnu_incremental_symtab section.
|
|
|
|
|
|
|
|
template<int size, bool big_endian>
|
|
|
|
void
|
|
|
|
Output_section_incremental_inputs<size, big_endian>::write_symtab(
|
|
|
|
unsigned char* pov,
|
|
|
|
unsigned int* global_syms,
|
|
|
|
unsigned int global_sym_count)
|
|
|
|
{
|
|
|
|
for (unsigned int i = 0; i < global_sym_count; ++i)
|
|
|
|
{
|
|
|
|
Swap32::writeval(pov, global_syms[i]);
|
|
|
|
pov += 4;
|
|
|
|
}
|
2009-04-24 15:44:02 +00:00
|
|
|
}
|
|
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2010-08-12 22:15:00 +00:00
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// This struct holds the view information needed to write the
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// .gnu_incremental_got_plt section.
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struct Got_plt_view_info
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{
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// Start of the GOT type array in the output view.
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unsigned char* got_type_p;
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// Start of the GOT descriptor array in the output view.
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unsigned char* got_desc_p;
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// Start of the PLT descriptor array in the output view.
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unsigned char* plt_desc_p;
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// Number of GOT entries.
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unsigned int got_count;
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// Number of PLT entries.
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unsigned int plt_count;
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// Offset of the first non-reserved PLT entry (this is a target-dependent value).
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unsigned int first_plt_entry_offset;
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// Size of a PLT entry (this is a target-dependent value).
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unsigned int plt_entry_size;
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// Value to write in the GOT descriptor array. For global symbols,
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// this is the global symbol table index; for local symbols, it is
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// the offset of the input file entry in the .gnu_incremental_inputs
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// section.
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unsigned int got_descriptor;
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};
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// Functor class for processing a GOT offset list for local symbols.
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// Writes the GOT type and symbol index into the GOT type and descriptor
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// arrays in the output section.
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template<int size, bool big_endian>
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class Local_got_offset_visitor
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{
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public:
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Local_got_offset_visitor(struct Got_plt_view_info& info)
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: info_(info)
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{ }
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void
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operator()(unsigned int got_type, unsigned int got_offset)
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{
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unsigned int got_index = got_offset / this->got_entry_size_;
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gold_assert(got_index < this->info_.got_count);
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// We can only handle GOT entry types in the range 0..0x7e
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// because we use a byte array to store them, and we use the
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// high bit to flag a local symbol.
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gold_assert(got_type < 0x7f);
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this->info_.got_type_p[got_index] = got_type | 0x80;
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unsigned char* pov = this->info_.got_desc_p + got_index * 4;
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elfcpp::Swap<32, big_endian>::writeval(pov, this->info_.got_descriptor);
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}
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private:
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static const unsigned int got_entry_size_ = size / 8;
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struct Got_plt_view_info& info_;
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};
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// Functor class for processing a GOT offset list. Writes the GOT type
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// and symbol index into the GOT type and descriptor arrays in the output
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// section.
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template<int size, bool big_endian>
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class Global_got_offset_visitor
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{
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public:
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Global_got_offset_visitor(struct Got_plt_view_info& info)
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: info_(info)
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{ }
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void
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operator()(unsigned int got_type, unsigned int got_offset)
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{
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unsigned int got_index = got_offset / this->got_entry_size_;
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gold_assert(got_index < this->info_.got_count);
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// We can only handle GOT entry types in the range 0..0x7e
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// because we use a byte array to store them, and we use the
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// high bit to flag a local symbol.
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gold_assert(got_type < 0x7f);
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this->info_.got_type_p[got_index] = got_type;
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unsigned char* pov = this->info_.got_desc_p + got_index * 4;
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elfcpp::Swap<32, big_endian>::writeval(pov, this->info_.got_descriptor);
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}
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private:
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static const unsigned int got_entry_size_ = size / 8;
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struct Got_plt_view_info& info_;
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};
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// Functor class for processing the global symbol table. Processes the
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// GOT offset list for the symbol, and writes the symbol table index
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// into the PLT descriptor array in the output section.
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template<int size, bool big_endian>
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class Global_symbol_visitor_got_plt
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{
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public:
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Global_symbol_visitor_got_plt(struct Got_plt_view_info& info)
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: info_(info)
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{ }
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void
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operator()(const Sized_symbol<size>* sym)
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{
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typedef Global_got_offset_visitor<size, big_endian> Got_visitor;
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const Got_offset_list* got_offsets = sym->got_offset_list();
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if (got_offsets != NULL)
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{
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info_.got_descriptor = sym->symtab_index();
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got_offsets->for_all_got_offsets(Got_visitor(info_));
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}
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if (sym->has_plt_offset())
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{
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unsigned int plt_index =
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((sym->plt_offset() - this->info_.first_plt_entry_offset)
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/ this->info_.plt_entry_size);
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gold_assert(plt_index < this->info_.plt_count);
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unsigned char* pov = this->info_.plt_desc_p + plt_index * 4;
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elfcpp::Swap<32, big_endian>::writeval(pov, sym->symtab_index());
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}
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}
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private:
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struct Got_plt_view_info& info_;
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};
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// Write the contents of the .gnu_incremental_got_plt section.
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template<int size, bool big_endian>
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void
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Output_section_incremental_inputs<size, big_endian>::write_got_plt(
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unsigned char* pov,
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off_t view_size)
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{
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Sized_target<size, big_endian>* target =
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parameters->sized_target<size, big_endian>();
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// Set up the view information for the functors.
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struct Got_plt_view_info view_info;
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view_info.got_count = target->got_entry_count();
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view_info.plt_count = target->plt_entry_count();
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view_info.first_plt_entry_offset = target->first_plt_entry_offset();
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view_info.plt_entry_size = target->plt_entry_size();
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view_info.got_type_p = pov + 8;
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view_info.got_desc_p = (view_info.got_type_p
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+ ((view_info.got_count + 3) & ~3));
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view_info.plt_desc_p = view_info.got_desc_p + view_info.got_count * 4;
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gold_assert(pov + view_size ==
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view_info.plt_desc_p + view_info.plt_count * 4);
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// Write the section header.
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Swap32::writeval(pov, view_info.got_count);
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Swap32::writeval(pov + 4, view_info.plt_count);
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// Initialize the GOT type array to 0xff (reserved).
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memset(view_info.got_type_p, 0xff, view_info.got_count);
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// Write the incremental GOT descriptors for local symbols.
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for (Incremental_inputs::Input_list::const_iterator p =
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this->inputs_->input_files().begin();
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p != this->inputs_->input_files().end();
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++p)
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{
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if ((*p)->type() != INCREMENTAL_INPUT_OBJECT
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&& (*p)->type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER)
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continue;
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Incremental_object_entry* entry = (*p)->object_entry();
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gold_assert(entry != NULL);
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const Sized_relobj<size, big_endian>* obj =
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static_cast<Sized_relobj<size, big_endian>*>(entry->object());
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gold_assert(obj != NULL);
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unsigned int nsyms = obj->local_symbol_count();
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for (unsigned int i = 0; i < nsyms; i++)
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{
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const Got_offset_list* got_offsets = obj->local_got_offset_list(i);
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if (got_offsets != NULL)
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{
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typedef Local_got_offset_visitor<size, big_endian> Got_visitor;
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view_info.got_descriptor = (*p)->get_offset();
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got_offsets->for_all_got_offsets(Got_visitor(view_info));
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}
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}
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}
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// Write the incremental GOT and PLT descriptors for global symbols.
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typedef Global_symbol_visitor_got_plt<size, big_endian> Symbol_visitor;
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symtab_->for_all_symbols<size, Symbol_visitor>(Symbol_visitor(view_info));
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}
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2009-10-09 16:40:51 +00:00
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// Instantiate the templates we need.
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#ifdef HAVE_TARGET_32_LITTLE
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template
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class Sized_incremental_binary<32, false>;
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#endif
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#ifdef HAVE_TARGET_32_BIG
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template
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class Sized_incremental_binary<32, true>;
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#endif
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#ifdef HAVE_TARGET_64_LITTLE
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template
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class Sized_incremental_binary<64, false>;
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#endif
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#ifdef HAVE_TARGET_64_BIG
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template
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class Sized_incremental_binary<64, true>;
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#endif
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2009-03-20 23:37:51 +00:00
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} // End namespace gold.
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