// merge.cc -- handle section merging for gold
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// merge.cc -- handle section merging for gold
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// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
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// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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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 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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// 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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// 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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// 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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// (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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// 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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// 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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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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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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// 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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// 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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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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// MA 02110-1301, USA.
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#include "gold.h"
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#include "gold.h"
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#include <cstdlib>
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#include <cstdlib>
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#include <algorithm>
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#include <algorithm>
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#include "merge.h"
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#include "merge.h"
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#include "compressed_output.h"
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#include "compressed_output.h"
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namespace gold
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namespace gold
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{
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{
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// Class Object_merge_map.
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// Class Object_merge_map.
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// Destructor.
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// Destructor.
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Object_merge_map::~Object_merge_map()
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Object_merge_map::~Object_merge_map()
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{
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{
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for (Section_merge_maps::iterator p = this->section_merge_maps_.begin();
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for (Section_merge_maps::iterator p = this->section_merge_maps_.begin();
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p != this->section_merge_maps_.end();
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p != this->section_merge_maps_.end();
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++p)
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++p)
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delete p->second;
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delete p->second;
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}
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}
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// Get the Input_merge_map to use for an input section, or NULL.
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// Get the Input_merge_map to use for an input section, or NULL.
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Object_merge_map::Input_merge_map*
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Object_merge_map::Input_merge_map*
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Object_merge_map::get_input_merge_map(unsigned int shndx)
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Object_merge_map::get_input_merge_map(unsigned int shndx)
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{
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{
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gold_assert(shndx != -1U);
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gold_assert(shndx != -1U);
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if (shndx == this->first_shnum_)
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if (shndx == this->first_shnum_)
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return &this->first_map_;
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return &this->first_map_;
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if (shndx == this->second_shnum_)
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if (shndx == this->second_shnum_)
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return &this->second_map_;
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return &this->second_map_;
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Section_merge_maps::const_iterator p = this->section_merge_maps_.find(shndx);
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Section_merge_maps::const_iterator p = this->section_merge_maps_.find(shndx);
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if (p != this->section_merge_maps_.end())
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if (p != this->section_merge_maps_.end())
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return p->second;
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return p->second;
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return NULL;
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return NULL;
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}
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}
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// Get or create the Input_merge_map to use for an input section.
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// Get or create the Input_merge_map to use for an input section.
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Object_merge_map::Input_merge_map*
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Object_merge_map::Input_merge_map*
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Object_merge_map::get_or_make_input_merge_map(const Merge_map* merge_map,
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Object_merge_map::get_or_make_input_merge_map(const Merge_map* merge_map,
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unsigned int shndx)
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unsigned int shndx)
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{
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{
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Input_merge_map* map = this->get_input_merge_map(shndx);
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Input_merge_map* map = this->get_input_merge_map(shndx);
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if (map != NULL)
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if (map != NULL)
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{
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{
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// For a given input section in a given object, every mapping
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// For a given input section in a given object, every mapping
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// must be done with the same Merge_map.
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// must be done with the same Merge_map.
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gold_assert(map->merge_map == merge_map);
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gold_assert(map->merge_map == merge_map);
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return map;
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return map;
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}
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}
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// We need to create a new entry.
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// We need to create a new entry.
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if (this->first_shnum_ == -1U)
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if (this->first_shnum_ == -1U)
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{
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{
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this->first_shnum_ = shndx;
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this->first_shnum_ = shndx;
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this->first_map_.merge_map = merge_map;
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this->first_map_.merge_map = merge_map;
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return &this->first_map_;
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return &this->first_map_;
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}
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}
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if (this->second_shnum_ == -1U)
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if (this->second_shnum_ == -1U)
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{
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{
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this->second_shnum_ = shndx;
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this->second_shnum_ = shndx;
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this->second_map_.merge_map = merge_map;
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this->second_map_.merge_map = merge_map;
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return &this->second_map_;
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return &this->second_map_;
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}
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}
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Input_merge_map* new_map = new Input_merge_map;
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Input_merge_map* new_map = new Input_merge_map;
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new_map->merge_map = merge_map;
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new_map->merge_map = merge_map;
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this->section_merge_maps_[shndx] = new_map;
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this->section_merge_maps_[shndx] = new_map;
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return new_map;
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return new_map;
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}
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}
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// Add a mapping.
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// Add a mapping.
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void
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void
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Object_merge_map::add_mapping(const Merge_map* merge_map, unsigned int shndx,
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Object_merge_map::add_mapping(const Merge_map* merge_map, unsigned int shndx,
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section_offset_type input_offset,
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section_offset_type input_offset,
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section_size_type length,
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section_size_type length,
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section_offset_type output_offset)
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section_offset_type output_offset)
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{
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{
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Input_merge_map* map = this->get_or_make_input_merge_map(merge_map, shndx);
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Input_merge_map* map = this->get_or_make_input_merge_map(merge_map, shndx);
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// Try to merge the new entry in the last one we saw.
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// Try to merge the new entry in the last one we saw.
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if (!map->entries.empty())
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if (!map->entries.empty())
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{
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{
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Input_merge_entry& entry(map->entries.back());
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Input_merge_entry& entry(map->entries.back());
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// Use section_size_type to avoid signed/unsigned warnings.
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// Use section_size_type to avoid signed/unsigned warnings.
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section_size_type input_offset_u = input_offset;
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section_size_type input_offset_u = input_offset;
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section_size_type output_offset_u = output_offset;
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section_size_type output_offset_u = output_offset;
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// If this entry is not in order, we need to sort the vector
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// If this entry is not in order, we need to sort the vector
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// before looking anything up.
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// before looking anything up.
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if (input_offset_u < entry.input_offset + entry.length)
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if (input_offset_u < entry.input_offset + entry.length)
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{
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{
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gold_assert(input_offset < entry.input_offset);
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gold_assert(input_offset < entry.input_offset);
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gold_assert(input_offset_u + length
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gold_assert(input_offset_u + length
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<= static_cast<section_size_type>(entry.input_offset));
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<= static_cast<section_size_type>(entry.input_offset));
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map->sorted = false;
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map->sorted = false;
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}
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}
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else if (entry.input_offset + entry.length == input_offset_u
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else if (entry.input_offset + entry.length == input_offset_u
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&& (output_offset == -1
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&& (output_offset == -1
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? entry.output_offset == -1
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? entry.output_offset == -1
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: entry.output_offset + entry.length == output_offset_u))
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: entry.output_offset + entry.length == output_offset_u))
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{
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{
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entry.length += length;
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entry.length += length;
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return;
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return;
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}
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}
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}
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}
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Input_merge_entry entry;
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Input_merge_entry entry;
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entry.input_offset = input_offset;
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entry.input_offset = input_offset;
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entry.length = length;
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entry.length = length;
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entry.output_offset = output_offset;
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entry.output_offset = output_offset;
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map->entries.push_back(entry);
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map->entries.push_back(entry);
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}
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}
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// Get the output offset for an input address.
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// Get the output offset for an input address.
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bool
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bool
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Object_merge_map::get_output_offset(const Merge_map* merge_map,
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Object_merge_map::get_output_offset(const Merge_map* merge_map,
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unsigned int shndx,
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unsigned int shndx,
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section_offset_type input_offset,
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section_offset_type input_offset,
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section_offset_type* output_offset)
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section_offset_type* output_offset)
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{
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{
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Input_merge_map* map = this->get_input_merge_map(shndx);
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Input_merge_map* map = this->get_input_merge_map(shndx);
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if (map == NULL
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if (map == NULL
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|| (merge_map != NULL && map->merge_map != merge_map))
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|| (merge_map != NULL && map->merge_map != merge_map))
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return false;
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return false;
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if (!map->sorted)
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if (!map->sorted)
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{
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{
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std::sort(map->entries.begin(), map->entries.end(),
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std::sort(map->entries.begin(), map->entries.end(),
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Input_merge_compare());
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Input_merge_compare());
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map->sorted = true;
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map->sorted = true;
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}
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}
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Input_merge_entry entry;
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Input_merge_entry entry;
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entry.input_offset = input_offset;
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entry.input_offset = input_offset;
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std::vector<Input_merge_entry>::const_iterator p =
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std::vector<Input_merge_entry>::const_iterator p =
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std::lower_bound(map->entries.begin(), map->entries.end(),
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std::lower_bound(map->entries.begin(), map->entries.end(),
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entry, Input_merge_compare());
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entry, Input_merge_compare());
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if (p == map->entries.end() || p->input_offset > input_offset)
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if (p == map->entries.end() || p->input_offset > input_offset)
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{
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{
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if (p == map->entries.begin())
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if (p == map->entries.begin())
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return false;
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return false;
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--p;
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--p;
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gold_assert(p->input_offset <= input_offset);
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gold_assert(p->input_offset <= input_offset);
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}
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}
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if (input_offset - p->input_offset
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if (input_offset - p->input_offset
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>= static_cast<section_offset_type>(p->length))
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>= static_cast<section_offset_type>(p->length))
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return false;
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return false;
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*output_offset = p->output_offset;
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*output_offset = p->output_offset;
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if (*output_offset != -1)
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if (*output_offset != -1)
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*output_offset += (input_offset - p->input_offset);
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*output_offset += (input_offset - p->input_offset);
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return true;
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return true;
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}
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}
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// Return whether this is the merge map for section SHNDX.
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// Return whether this is the merge map for section SHNDX.
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inline bool
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inline bool
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Object_merge_map::is_merge_section_for(const Merge_map* merge_map,
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Object_merge_map::is_merge_section_for(const Merge_map* merge_map,
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unsigned int shndx)
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unsigned int shndx)
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{
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{
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Input_merge_map* map = this->get_input_merge_map(shndx);
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Input_merge_map* map = this->get_input_merge_map(shndx);
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return map != NULL && map->merge_map == merge_map;
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return map != NULL && map->merge_map == merge_map;
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}
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}
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// Initialize a mapping from input offsets to output addresses.
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// Initialize a mapping from input offsets to output addresses.
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template<int size>
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template<int size>
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void
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void
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Object_merge_map::initialize_input_to_output_map(
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Object_merge_map::initialize_input_to_output_map(
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unsigned int shndx,
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unsigned int shndx,
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typename elfcpp::Elf_types<size>::Elf_Addr starting_address,
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typename elfcpp::Elf_types<size>::Elf_Addr starting_address,
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Unordered_map<section_offset_type,
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Unordered_map<section_offset_type,
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typename elfcpp::Elf_types<size>::Elf_Addr>* initialize_map)
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typename elfcpp::Elf_types<size>::Elf_Addr>* initialize_map)
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{
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{
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Input_merge_map* map = this->get_input_merge_map(shndx);
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Input_merge_map* map = this->get_input_merge_map(shndx);
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gold_assert(map != NULL);
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gold_assert(map != NULL);
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gold_assert(initialize_map->empty());
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gold_assert(initialize_map->empty());
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// We know how many entries we are going to add.
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// We know how many entries we are going to add.
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// reserve_unordered_map takes an expected count of buckets, not a
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// reserve_unordered_map takes an expected count of buckets, not a
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// count of elements, so double it to try to reduce collisions.
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// count of elements, so double it to try to reduce collisions.
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reserve_unordered_map(initialize_map, map->entries.size() * 2);
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reserve_unordered_map(initialize_map, map->entries.size() * 2);
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for (Input_merge_map::Entries::const_iterator p = map->entries.begin();
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for (Input_merge_map::Entries::const_iterator p = map->entries.begin();
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p != map->entries.end();
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p != map->entries.end();
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++p)
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++p)
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{
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{
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section_offset_type output_offset = p->output_offset;
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section_offset_type output_offset = p->output_offset;
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if (output_offset != -1)
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if (output_offset != -1)
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output_offset += starting_address;
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output_offset += starting_address;
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else
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else
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{
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{
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// If we see a relocation against an address we have chosen
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// If we see a relocation against an address we have chosen
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// to discard, we relocate to zero. FIXME: We could also
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// to discard, we relocate to zero. FIXME: We could also
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// issue a warning in this case; that would require
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// issue a warning in this case; that would require
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// reporting this somehow and checking it in the routines in
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// reporting this somehow and checking it in the routines in
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// reloc.h.
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// reloc.h.
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output_offset = 0;
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output_offset = 0;
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}
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}
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initialize_map->insert(std::make_pair(p->input_offset, output_offset));
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initialize_map->insert(std::make_pair(p->input_offset, output_offset));
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}
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}
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}
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}
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// Class Merge_map.
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// Class Merge_map.
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// Add a mapping for the bytes from OFFSET to OFFSET + LENGTH in input
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// Add a mapping for the bytes from OFFSET to OFFSET + LENGTH in input
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// section SHNDX in object OBJECT to an OUTPUT_OFFSET in merged data
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// section SHNDX in object OBJECT to an OUTPUT_OFFSET in merged data
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// in an output section.
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// in an output section.
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void
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void
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Merge_map::add_mapping(Relobj* object, unsigned int shndx,
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Merge_map::add_mapping(Relobj* object, unsigned int shndx,
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section_offset_type offset, section_size_type length,
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section_offset_type offset, section_size_type length,
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section_offset_type output_offset)
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section_offset_type output_offset)
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{
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{
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gold_assert(object != NULL);
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gold_assert(object != NULL);
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Object_merge_map* object_merge_map = object->merge_map();
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Object_merge_map* object_merge_map = object->merge_map();
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if (object_merge_map == NULL)
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if (object_merge_map == NULL)
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{
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{
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object_merge_map = new Object_merge_map();
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object_merge_map = new Object_merge_map();
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object->set_merge_map(object_merge_map);
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object->set_merge_map(object_merge_map);
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}
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}
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object_merge_map->add_mapping(this, shndx, offset, length, output_offset);
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object_merge_map->add_mapping(this, shndx, offset, length, output_offset);
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}
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}
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// Return the output offset for an input address. The input address
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// Return the output offset for an input address. The input address
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// is at offset OFFSET in section SHNDX in OBJECT. This sets
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// is at offset OFFSET in section SHNDX in OBJECT. This sets
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// *OUTPUT_OFFSET to the offset in the merged data in the output
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// *OUTPUT_OFFSET to the offset in the merged data in the output
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// section. This returns true if the mapping is known, false
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// section. This returns true if the mapping is known, false
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// otherwise.
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// otherwise.
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bool
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bool
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Merge_map::get_output_offset(const Relobj* object, unsigned int shndx,
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Merge_map::get_output_offset(const Relobj* object, unsigned int shndx,
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section_offset_type offset,
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section_offset_type offset,
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section_offset_type* output_offset) const
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section_offset_type* output_offset) const
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{
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{
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Object_merge_map* object_merge_map = object->merge_map();
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Object_merge_map* object_merge_map = object->merge_map();
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if (object_merge_map == NULL)
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if (object_merge_map == NULL)
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return false;
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return false;
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return object_merge_map->get_output_offset(this, shndx, offset,
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return object_merge_map->get_output_offset(this, shndx, offset,
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output_offset);
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output_offset);
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}
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}
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// Return whether this is the merge section for SHNDX in OBJECT.
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// Return whether this is the merge section for SHNDX in OBJECT.
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bool
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bool
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Merge_map::is_merge_section_for(const Relobj* object, unsigned int shndx) const
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Merge_map::is_merge_section_for(const Relobj* object, unsigned int shndx) const
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{
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{
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Object_merge_map* object_merge_map = object->merge_map();
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Object_merge_map* object_merge_map = object->merge_map();
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if (object_merge_map == NULL)
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if (object_merge_map == NULL)
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return false;
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return false;
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return object_merge_map->is_merge_section_for(this, shndx);
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return object_merge_map->is_merge_section_for(this, shndx);
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}
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}
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// Class Output_merge_base.
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// Class Output_merge_base.
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// Return the output offset for an input offset. The input address is
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// Return the output offset for an input offset. The input address is
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// at offset OFFSET in section SHNDX in OBJECT. If we know the
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// at offset OFFSET in section SHNDX in OBJECT. If we know the
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// offset, set *POUTPUT and return true. Otherwise return false.
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// offset, set *POUTPUT and return true. Otherwise return false.
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bool
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bool
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Output_merge_base::do_output_offset(const Relobj* object,
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Output_merge_base::do_output_offset(const Relobj* object,
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unsigned int shndx,
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unsigned int shndx,
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section_offset_type offset,
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section_offset_type offset,
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section_offset_type* poutput) const
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section_offset_type* poutput) const
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{
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{
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return this->merge_map_.get_output_offset(object, shndx, offset, poutput);
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return this->merge_map_.get_output_offset(object, shndx, offset, poutput);
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}
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}
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// Return whether this is the merge section for SHNDX in OBJECT.
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// Return whether this is the merge section for SHNDX in OBJECT.
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bool
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bool
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Output_merge_base::do_is_merge_section_for(const Relobj* object,
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Output_merge_base::do_is_merge_section_for(const Relobj* object,
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unsigned int shndx) const
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unsigned int shndx) const
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{
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{
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return this->merge_map_.is_merge_section_for(object, shndx);
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return this->merge_map_.is_merge_section_for(object, shndx);
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}
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}
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// Record a merged input section for script processing.
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// Record a merged input section for script processing.
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void
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void
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Output_merge_base::record_input_section(Relobj* relobj, unsigned int shndx)
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Output_merge_base::record_input_section(Relobj* relobj, unsigned int shndx)
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{
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{
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gold_assert(this->keeps_input_sections_ && relobj != NULL);
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gold_assert(this->keeps_input_sections_ && relobj != NULL);
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// If this is the first input section, record it. We need do this because
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// If this is the first input section, record it. We need do this because
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// this->input_sections_ is unordered.
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// this->input_sections_ is unordered.
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if (this->first_relobj_ == NULL)
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if (this->first_relobj_ == NULL)
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{
|
{
|
this->first_relobj_ = relobj;
|
this->first_relobj_ = relobj;
|
this->first_shndx_ = shndx;
|
this->first_shndx_ = shndx;
|
}
|
}
|
|
|
std::pair<Input_sections::iterator, bool> result =
|
std::pair<Input_sections::iterator, bool> result =
|
this->input_sections_.insert(Section_id(relobj, shndx));
|
this->input_sections_.insert(Section_id(relobj, shndx));
|
// We should insert a merge section once only.
|
// We should insert a merge section once only.
|
gold_assert(result.second);
|
gold_assert(result.second);
|
}
|
}
|
|
|
// Class Output_merge_data.
|
// Class Output_merge_data.
|
|
|
// Compute the hash code for a fixed-size constant.
|
// Compute the hash code for a fixed-size constant.
|
|
|
size_t
|
size_t
|
Output_merge_data::Merge_data_hash::operator()(Merge_data_key k) const
|
Output_merge_data::Merge_data_hash::operator()(Merge_data_key k) const
|
{
|
{
|
const unsigned char* p = this->pomd_->constant(k);
|
const unsigned char* p = this->pomd_->constant(k);
|
section_size_type entsize =
|
section_size_type entsize =
|
convert_to_section_size_type(this->pomd_->entsize());
|
convert_to_section_size_type(this->pomd_->entsize());
|
|
|
// Fowler/Noll/Vo (FNV) hash (type FNV-1a).
|
// Fowler/Noll/Vo (FNV) hash (type FNV-1a).
|
if (sizeof(size_t) == 8)
|
if (sizeof(size_t) == 8)
|
{
|
{
|
size_t result = static_cast<size_t>(14695981039346656037ULL);
|
size_t result = static_cast<size_t>(14695981039346656037ULL);
|
for (section_size_type i = 0; i < entsize; ++i)
|
for (section_size_type i = 0; i < entsize; ++i)
|
{
|
{
|
result &= (size_t) *p++;
|
result &= (size_t) *p++;
|
result *= 1099511628211ULL;
|
result *= 1099511628211ULL;
|
}
|
}
|
return result;
|
return result;
|
}
|
}
|
else
|
else
|
{
|
{
|
size_t result = 2166136261UL;
|
size_t result = 2166136261UL;
|
for (section_size_type i = 0; i < entsize; ++i)
|
for (section_size_type i = 0; i < entsize; ++i)
|
{
|
{
|
result ^= (size_t) *p++;
|
result ^= (size_t) *p++;
|
result *= 16777619UL;
|
result *= 16777619UL;
|
}
|
}
|
return result;
|
return result;
|
}
|
}
|
}
|
}
|
|
|
// Return whether one hash table key equals another.
|
// Return whether one hash table key equals another.
|
|
|
bool
|
bool
|
Output_merge_data::Merge_data_eq::operator()(Merge_data_key k1,
|
Output_merge_data::Merge_data_eq::operator()(Merge_data_key k1,
|
Merge_data_key k2) const
|
Merge_data_key k2) const
|
{
|
{
|
const unsigned char* p1 = this->pomd_->constant(k1);
|
const unsigned char* p1 = this->pomd_->constant(k1);
|
const unsigned char* p2 = this->pomd_->constant(k2);
|
const unsigned char* p2 = this->pomd_->constant(k2);
|
return memcmp(p1, p2, this->pomd_->entsize()) == 0;
|
return memcmp(p1, p2, this->pomd_->entsize()) == 0;
|
}
|
}
|
|
|
// Add a constant to the end of the section contents.
|
// Add a constant to the end of the section contents.
|
|
|
void
|
void
|
Output_merge_data::add_constant(const unsigned char* p)
|
Output_merge_data::add_constant(const unsigned char* p)
|
{
|
{
|
section_size_type entsize = convert_to_section_size_type(this->entsize());
|
section_size_type entsize = convert_to_section_size_type(this->entsize());
|
section_size_type addralign =
|
section_size_type addralign =
|
convert_to_section_size_type(this->addralign());
|
convert_to_section_size_type(this->addralign());
|
section_size_type addsize = std::max(entsize, addralign);
|
section_size_type addsize = std::max(entsize, addralign);
|
if (this->len_ + addsize > this->alc_)
|
if (this->len_ + addsize > this->alc_)
|
{
|
{
|
if (this->alc_ == 0)
|
if (this->alc_ == 0)
|
this->alc_ = 128 * addsize;
|
this->alc_ = 128 * addsize;
|
else
|
else
|
this->alc_ *= 2;
|
this->alc_ *= 2;
|
this->p_ = static_cast<unsigned char*>(realloc(this->p_, this->alc_));
|
this->p_ = static_cast<unsigned char*>(realloc(this->p_, this->alc_));
|
if (this->p_ == NULL)
|
if (this->p_ == NULL)
|
gold_nomem();
|
gold_nomem();
|
}
|
}
|
|
|
memcpy(this->p_ + this->len_, p, entsize);
|
memcpy(this->p_ + this->len_, p, entsize);
|
if (addsize > entsize)
|
if (addsize > entsize)
|
memset(this->p_ + this->len_ + entsize, 0, addsize - entsize);
|
memset(this->p_ + this->len_ + entsize, 0, addsize - entsize);
|
this->len_ += addsize;
|
this->len_ += addsize;
|
}
|
}
|
|
|
// Add the input section SHNDX in OBJECT to a merged output section
|
// Add the input section SHNDX in OBJECT to a merged output section
|
// which holds fixed length constants. Return whether we were able to
|
// which holds fixed length constants. Return whether we were able to
|
// handle the section; if not, it will be linked as usual without
|
// handle the section; if not, it will be linked as usual without
|
// constant merging.
|
// constant merging.
|
|
|
bool
|
bool
|
Output_merge_data::do_add_input_section(Relobj* object, unsigned int shndx)
|
Output_merge_data::do_add_input_section(Relobj* object, unsigned int shndx)
|
{
|
{
|
section_size_type len;
|
section_size_type len;
|
section_size_type uncompressed_size = 0;
|
bool is_new;
|
unsigned char* uncompressed_data = NULL;
|
const unsigned char* p = object->decompressed_section_contents(shndx, &len,
|
const unsigned char* p = object->section_contents(shndx, &len, false);
|
&is_new);
|
|
|
if (object->section_is_compressed(shndx, &uncompressed_size))
|
|
{
|
|
uncompressed_data = new unsigned char[uncompressed_size];
|
|
if (!decompress_input_section(p, len, uncompressed_data,
|
|
uncompressed_size))
|
|
object->error(_("could not decompress section %s"),
|
|
object->section_name(shndx).c_str());
|
|
p = uncompressed_data;
|
|
len = uncompressed_size;
|
|
}
|
|
|
|
section_size_type entsize = convert_to_section_size_type(this->entsize());
|
section_size_type entsize = convert_to_section_size_type(this->entsize());
|
|
|
if (len % entsize != 0)
|
if (len % entsize != 0)
|
{
|
{
|
if (uncompressed_data != NULL)
|
if (is_new)
|
delete[] uncompressed_data;
|
delete[] p;
|
return false;
|
return false;
|
}
|
}
|
|
|
this->input_count_ += len / entsize;
|
this->input_count_ += len / entsize;
|
|
|
for (section_size_type i = 0; i < len; i += entsize, p += entsize)
|
for (section_size_type i = 0; i < len; i += entsize, p += entsize)
|
{
|
{
|
// Add the constant to the section contents. If we find that it
|
// Add the constant to the section contents. If we find that it
|
// is already in the hash table, we will remove it again.
|
// is already in the hash table, we will remove it again.
|
Merge_data_key k = this->len_;
|
Merge_data_key k = this->len_;
|
this->add_constant(p);
|
this->add_constant(p);
|
|
|
std::pair<Merge_data_hashtable::iterator, bool> ins =
|
std::pair<Merge_data_hashtable::iterator, bool> ins =
|
this->hashtable_.insert(k);
|
this->hashtable_.insert(k);
|
|
|
if (!ins.second)
|
if (!ins.second)
|
{
|
{
|
// Key was already present. Remove the copy we just added.
|
// Key was already present. Remove the copy we just added.
|
this->len_ -= entsize;
|
this->len_ -= entsize;
|
k = *ins.first;
|
k = *ins.first;
|
}
|
}
|
|
|
// Record the offset of this constant in the output section.
|
// Record the offset of this constant in the output section.
|
this->add_mapping(object, shndx, i, entsize, k);
|
this->add_mapping(object, shndx, i, entsize, k);
|
}
|
}
|
|
|
// For script processing, we keep the input sections.
|
// For script processing, we keep the input sections.
|
if (this->keeps_input_sections())
|
if (this->keeps_input_sections())
|
record_input_section(object, shndx);
|
record_input_section(object, shndx);
|
|
|
if (uncompressed_data != NULL)
|
if (is_new)
|
delete[] uncompressed_data;
|
delete[] p;
|
|
|
return true;
|
return true;
|
}
|
}
|
|
|
// Set the final data size in a merged output section with fixed size
|
// Set the final data size in a merged output section with fixed size
|
// constants.
|
// constants.
|
|
|
void
|
void
|
Output_merge_data::set_final_data_size()
|
Output_merge_data::set_final_data_size()
|
{
|
{
|
// Release the memory we don't need.
|
// Release the memory we don't need.
|
this->p_ = static_cast<unsigned char*>(realloc(this->p_, this->len_));
|
this->p_ = static_cast<unsigned char*>(realloc(this->p_, this->len_));
|
// An Output_merge_data object may be empty and realloc is allowed
|
// An Output_merge_data object may be empty and realloc is allowed
|
// to return a NULL pointer in this case. An Output_merge_data is empty
|
// to return a NULL pointer in this case. An Output_merge_data is empty
|
// if all its input sections have sizes that are not multiples of entsize.
|
// if all its input sections have sizes that are not multiples of entsize.
|
gold_assert(this->p_ != NULL || this->len_ == 0);
|
gold_assert(this->p_ != NULL || this->len_ == 0);
|
this->set_data_size(this->len_);
|
this->set_data_size(this->len_);
|
}
|
}
|
|
|
// Write the data of a merged output section with fixed size constants
|
// Write the data of a merged output section with fixed size constants
|
// to the file.
|
// to the file.
|
|
|
void
|
void
|
Output_merge_data::do_write(Output_file* of)
|
Output_merge_data::do_write(Output_file* of)
|
{
|
{
|
of->write(this->offset(), this->p_, this->len_);
|
of->write(this->offset(), this->p_, this->len_);
|
}
|
}
|
|
|
// Write the data to a buffer.
|
// Write the data to a buffer.
|
|
|
void
|
void
|
Output_merge_data::do_write_to_buffer(unsigned char* buffer)
|
Output_merge_data::do_write_to_buffer(unsigned char* buffer)
|
{
|
{
|
memcpy(buffer, this->p_, this->len_);
|
memcpy(buffer, this->p_, this->len_);
|
}
|
}
|
|
|
// Print merge stats to stderr.
|
// Print merge stats to stderr.
|
|
|
void
|
void
|
Output_merge_data::do_print_merge_stats(const char* section_name)
|
Output_merge_data::do_print_merge_stats(const char* section_name)
|
{
|
{
|
fprintf(stderr,
|
fprintf(stderr,
|
_("%s: %s merged constants size: %lu; input: %zu; output: %zu\n"),
|
_("%s: %s merged constants size: %lu; input: %zu; output: %zu\n"),
|
program_name, section_name,
|
program_name, section_name,
|
static_cast<unsigned long>(this->entsize()),
|
static_cast<unsigned long>(this->entsize()),
|
this->input_count_, this->hashtable_.size());
|
this->input_count_, this->hashtable_.size());
|
}
|
}
|
|
|
// Class Output_merge_string.
|
// Class Output_merge_string.
|
|
|
// Add an input section to a merged string section.
|
// Add an input section to a merged string section.
|
|
|
template<typename Char_type>
|
template<typename Char_type>
|
bool
|
bool
|
Output_merge_string<Char_type>::do_add_input_section(Relobj* object,
|
Output_merge_string<Char_type>::do_add_input_section(Relobj* object,
|
unsigned int shndx)
|
unsigned int shndx)
|
{
|
{
|
section_size_type len;
|
section_size_type len;
|
section_size_type uncompressed_size = 0;
|
bool is_new;
|
unsigned char* uncompressed_data = NULL;
|
const unsigned char* pdata = object->decompressed_section_contents(shndx,
|
const unsigned char* pdata = object->section_contents(shndx, &len, false);
|
&len,
|
|
&is_new);
|
if (object->section_is_compressed(shndx, &uncompressed_size))
|
|
{
|
|
uncompressed_data = new unsigned char[uncompressed_size];
|
|
if (!decompress_input_section(pdata, len, uncompressed_data,
|
|
uncompressed_size))
|
|
object->error(_("could not decompress section %s"),
|
|
object->section_name(shndx).c_str());
|
|
pdata = uncompressed_data;
|
|
len = uncompressed_size;
|
|
}
|
|
|
|
const Char_type* p = reinterpret_cast<const Char_type*>(pdata);
|
const Char_type* p = reinterpret_cast<const Char_type*>(pdata);
|
const Char_type* pend = p + len / sizeof(Char_type);
|
const Char_type* pend = p + len / sizeof(Char_type);
|
const Char_type* pend0 = pend;
|
const Char_type* pend0 = pend;
|
|
|
if (len % sizeof(Char_type) != 0)
|
if (len % sizeof(Char_type) != 0)
|
{
|
{
|
object->error(_("mergeable string section length not multiple of "
|
object->error(_("mergeable string section length not multiple of "
|
"character size"));
|
"character size"));
|
if (uncompressed_data != NULL)
|
if (is_new)
|
delete[] uncompressed_data;
|
delete[] pdata;
|
return false;
|
return false;
|
}
|
}
|
|
|
if (pend[-1] != 0)
|
if (pend[-1] != 0)
|
{
|
{
|
gold_warning(_("%s: last entry in mergeable string section '%s' "
|
gold_warning(_("%s: last entry in mergeable string section '%s' "
|
"not null terminated"),
|
"not null terminated"),
|
object->name().c_str(),
|
object->name().c_str(),
|
object->section_name(shndx).c_str());
|
object->section_name(shndx).c_str());
|
// Find the end of the last NULL-terminated string in the buffer.
|
// Find the end of the last NULL-terminated string in the buffer.
|
while (pend0 > p && pend0[-1] != 0)
|
while (pend0 > p && pend0[-1] != 0)
|
--pend0;
|
--pend0;
|
}
|
}
|
|
|
Merged_strings_list* merged_strings_list =
|
Merged_strings_list* merged_strings_list =
|
new Merged_strings_list(object, shndx);
|
new Merged_strings_list(object, shndx);
|
this->merged_strings_lists_.push_back(merged_strings_list);
|
this->merged_strings_lists_.push_back(merged_strings_list);
|
Merged_strings& merged_strings = merged_strings_list->merged_strings;
|
Merged_strings& merged_strings = merged_strings_list->merged_strings;
|
|
|
// Count the number of strings in the section and size the list.
|
// Count the number of strings in the section and size the list.
|
size_t count = 0;
|
size_t count = 0;
|
for (const Char_type* pt = p; pt < pend0; pt += string_length(pt) + 1)
|
for (const Char_type* pt = p; pt < pend0; pt += string_length(pt) + 1)
|
++count;
|
++count;
|
if (pend0 < pend)
|
if (pend0 < pend)
|
++count;
|
++count;
|
merged_strings.reserve(count + 1);
|
merged_strings.reserve(count + 1);
|
|
|
// The index I is in bytes, not characters.
|
// The index I is in bytes, not characters.
|
section_size_type i = 0;
|
section_size_type i = 0;
|
while (p < pend0)
|
while (p < pend0)
|
{
|
{
|
size_t len = string_length(p);
|
size_t len = string_length(p);
|
|
|
Stringpool::Key key;
|
Stringpool::Key key;
|
this->stringpool_.add_with_length(p, len, true, &key);
|
this->stringpool_.add_with_length(p, len, true, &key);
|
|
|
merged_strings.push_back(Merged_string(i, key));
|
merged_strings.push_back(Merged_string(i, key));
|
|
|
p += len + 1;
|
p += len + 1;
|
i += (len + 1) * sizeof(Char_type);
|
i += (len + 1) * sizeof(Char_type);
|
}
|
}
|
if (p < pend)
|
if (p < pend)
|
{
|
{
|
size_t len = pend - p;
|
size_t len = pend - p;
|
|
|
Stringpool::Key key;
|
Stringpool::Key key;
|
this->stringpool_.add_with_length(p, len, true, &key);
|
this->stringpool_.add_with_length(p, len, true, &key);
|
|
|
merged_strings.push_back(Merged_string(i, key));
|
merged_strings.push_back(Merged_string(i, key));
|
|
|
i += (len + 1) * sizeof(Char_type);
|
i += (len + 1) * sizeof(Char_type);
|
}
|
}
|
|
|
// Record the last offset in the input section so that we can
|
// Record the last offset in the input section so that we can
|
// compute the length of the last string.
|
// compute the length of the last string.
|
merged_strings.push_back(Merged_string(i, 0));
|
merged_strings.push_back(Merged_string(i, 0));
|
|
|
this->input_count_ += count;
|
this->input_count_ += count;
|
this->input_size_ += len;
|
this->input_size_ += len;
|
|
|
// For script processing, we keep the input sections.
|
// For script processing, we keep the input sections.
|
if (this->keeps_input_sections())
|
if (this->keeps_input_sections())
|
record_input_section(object, shndx);
|
record_input_section(object, shndx);
|
|
|
if (uncompressed_data != NULL)
|
if (is_new)
|
delete[] uncompressed_data;
|
delete[] pdata;
|
|
|
return true;
|
return true;
|
}
|
}
|
|
|
// Finalize the mappings from the input sections to the output
|
// Finalize the mappings from the input sections to the output
|
// section, and return the final data size.
|
// section, and return the final data size.
|
|
|
template<typename Char_type>
|
template<typename Char_type>
|
section_size_type
|
section_size_type
|
Output_merge_string<Char_type>::finalize_merged_data()
|
Output_merge_string<Char_type>::finalize_merged_data()
|
{
|
{
|
this->stringpool_.set_string_offsets();
|
this->stringpool_.set_string_offsets();
|
|
|
for (typename Merged_strings_lists::const_iterator l =
|
for (typename Merged_strings_lists::const_iterator l =
|
this->merged_strings_lists_.begin();
|
this->merged_strings_lists_.begin();
|
l != this->merged_strings_lists_.end();
|
l != this->merged_strings_lists_.end();
|
++l)
|
++l)
|
{
|
{
|
section_offset_type last_input_offset = 0;
|
section_offset_type last_input_offset = 0;
|
section_offset_type last_output_offset = 0;
|
section_offset_type last_output_offset = 0;
|
for (typename Merged_strings::const_iterator p =
|
for (typename Merged_strings::const_iterator p =
|
(*l)->merged_strings.begin();
|
(*l)->merged_strings.begin();
|
p != (*l)->merged_strings.end();
|
p != (*l)->merged_strings.end();
|
++p)
|
++p)
|
{
|
{
|
section_size_type length = p->offset - last_input_offset;
|
section_size_type length = p->offset - last_input_offset;
|
if (length > 0)
|
if (length > 0)
|
this->add_mapping((*l)->object, (*l)->shndx, last_input_offset,
|
this->add_mapping((*l)->object, (*l)->shndx, last_input_offset,
|
length, last_output_offset);
|
length, last_output_offset);
|
last_input_offset = p->offset;
|
last_input_offset = p->offset;
|
if (p->stringpool_key != 0)
|
if (p->stringpool_key != 0)
|
last_output_offset =
|
last_output_offset =
|
this->stringpool_.get_offset_from_key(p->stringpool_key);
|
this->stringpool_.get_offset_from_key(p->stringpool_key);
|
}
|
}
|
delete *l;
|
delete *l;
|
}
|
}
|
|
|
// Save some memory. This also ensures that this function will work
|
// Save some memory. This also ensures that this function will work
|
// if called twice, as may happen if Layout::set_segment_offsets
|
// if called twice, as may happen if Layout::set_segment_offsets
|
// finds a better alignment.
|
// finds a better alignment.
|
this->merged_strings_lists_.clear();
|
this->merged_strings_lists_.clear();
|
|
|
return this->stringpool_.get_strtab_size();
|
return this->stringpool_.get_strtab_size();
|
}
|
}
|
|
|
template<typename Char_type>
|
template<typename Char_type>
|
void
|
void
|
Output_merge_string<Char_type>::set_final_data_size()
|
Output_merge_string<Char_type>::set_final_data_size()
|
{
|
{
|
const off_t final_data_size = this->finalize_merged_data();
|
const off_t final_data_size = this->finalize_merged_data();
|
this->set_data_size(final_data_size);
|
this->set_data_size(final_data_size);
|
}
|
}
|
|
|
// Write out a merged string section.
|
// Write out a merged string section.
|
|
|
template<typename Char_type>
|
template<typename Char_type>
|
void
|
void
|
Output_merge_string<Char_type>::do_write(Output_file* of)
|
Output_merge_string<Char_type>::do_write(Output_file* of)
|
{
|
{
|
this->stringpool_.write(of, this->offset());
|
this->stringpool_.write(of, this->offset());
|
}
|
}
|
|
|
// Write a merged string section to a buffer.
|
// Write a merged string section to a buffer.
|
|
|
template<typename Char_type>
|
template<typename Char_type>
|
void
|
void
|
Output_merge_string<Char_type>::do_write_to_buffer(unsigned char* buffer)
|
Output_merge_string<Char_type>::do_write_to_buffer(unsigned char* buffer)
|
{
|
{
|
this->stringpool_.write_to_buffer(buffer, this->data_size());
|
this->stringpool_.write_to_buffer(buffer, this->data_size());
|
}
|
}
|
|
|
// Return the name of the types of string to use with
|
// Return the name of the types of string to use with
|
// do_print_merge_stats.
|
// do_print_merge_stats.
|
|
|
template<typename Char_type>
|
template<typename Char_type>
|
const char*
|
const char*
|
Output_merge_string<Char_type>::string_name()
|
Output_merge_string<Char_type>::string_name()
|
{
|
{
|
gold_unreachable();
|
gold_unreachable();
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
template<>
|
template<>
|
const char*
|
const char*
|
Output_merge_string<char>::string_name()
|
Output_merge_string<char>::string_name()
|
{
|
{
|
return "strings";
|
return "strings";
|
}
|
}
|
|
|
template<>
|
template<>
|
const char*
|
const char*
|
Output_merge_string<uint16_t>::string_name()
|
Output_merge_string<uint16_t>::string_name()
|
{
|
{
|
return "16-bit strings";
|
return "16-bit strings";
|
}
|
}
|
|
|
template<>
|
template<>
|
const char*
|
const char*
|
Output_merge_string<uint32_t>::string_name()
|
Output_merge_string<uint32_t>::string_name()
|
{
|
{
|
return "32-bit strings";
|
return "32-bit strings";
|
}
|
}
|
|
|
// Print merge stats to stderr.
|
// Print merge stats to stderr.
|
|
|
template<typename Char_type>
|
template<typename Char_type>
|
void
|
void
|
Output_merge_string<Char_type>::do_print_merge_stats(const char* section_name)
|
Output_merge_string<Char_type>::do_print_merge_stats(const char* section_name)
|
{
|
{
|
char buf[200];
|
char buf[200];
|
snprintf(buf, sizeof buf, "%s merged %s", section_name, this->string_name());
|
snprintf(buf, sizeof buf, "%s merged %s", section_name, this->string_name());
|
fprintf(stderr, _("%s: %s input bytes: %zu\n"),
|
fprintf(stderr, _("%s: %s input bytes: %zu\n"),
|
program_name, buf, this->input_size_);
|
program_name, buf, this->input_size_);
|
fprintf(stderr, _("%s: %s input strings: %zu\n"),
|
fprintf(stderr, _("%s: %s input strings: %zu\n"),
|
program_name, buf, this->input_count_);
|
program_name, buf, this->input_count_);
|
this->stringpool_.print_stats(buf);
|
this->stringpool_.print_stats(buf);
|
}
|
}
|
|
|
// Instantiate the templates we need.
|
// Instantiate the templates we need.
|
|
|
template
|
template
|
class Output_merge_string<char>;
|
class Output_merge_string<char>;
|
|
|
template
|
template
|
class Output_merge_string<uint16_t>;
|
class Output_merge_string<uint16_t>;
|
|
|
template
|
template
|
class Output_merge_string<uint32_t>;
|
class Output_merge_string<uint32_t>;
|
|
|
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
|
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
|
template
|
template
|
void
|
void
|
Object_merge_map::initialize_input_to_output_map<32>(
|
Object_merge_map::initialize_input_to_output_map<32>(
|
unsigned int shndx,
|
unsigned int shndx,
|
elfcpp::Elf_types<32>::Elf_Addr starting_address,
|
elfcpp::Elf_types<32>::Elf_Addr starting_address,
|
Unordered_map<section_offset_type, elfcpp::Elf_types<32>::Elf_Addr>*);
|
Unordered_map<section_offset_type, elfcpp::Elf_types<32>::Elf_Addr>*);
|
#endif
|
#endif
|
|
|
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
|
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
|
template
|
template
|
void
|
void
|
Object_merge_map::initialize_input_to_output_map<64>(
|
Object_merge_map::initialize_input_to_output_map<64>(
|
unsigned int shndx,
|
unsigned int shndx,
|
elfcpp::Elf_types<64>::Elf_Addr starting_address,
|
elfcpp::Elf_types<64>::Elf_Addr starting_address,
|
Unordered_map<section_offset_type, elfcpp::Elf_types<64>::Elf_Addr>*);
|
Unordered_map<section_offset_type, elfcpp::Elf_types<64>::Elf_Addr>*);
|
#endif
|
#endif
|
|
|
} // End namespace gold.
|
} // End namespace gold.
|
|
|
