1560 lines
47 KiB
C++
1560 lines
47 KiB
C++
// object.h -- support for an object file for linking in gold -*- C++ -*-
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// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#ifndef GOLD_OBJECT_H
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#define GOLD_OBJECT_H
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#include <string>
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#include <vector>
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#include "elfcpp.h"
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#include "elfcpp_file.h"
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#include "fileread.h"
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#include "target.h"
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namespace gold
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{
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class General_options;
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class Task;
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class Layout;
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class Output_section;
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class Output_file;
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class Dynobj;
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class Object_merge_map;
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class Relocatable_relocs;
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template<typename Stringpool_char>
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class Stringpool_template;
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// Data to pass from read_symbols() to add_symbols().
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struct Read_symbols_data
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{
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// Section headers.
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File_view* section_headers;
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// Section names.
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File_view* section_names;
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// Size of section name data in bytes.
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section_size_type section_names_size;
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// Symbol data.
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File_view* symbols;
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// Size of symbol data in bytes.
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section_size_type symbols_size;
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// Offset of external symbols within symbol data. This structure
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// sometimes contains only external symbols, in which case this will
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// be zero. Sometimes it contains all symbols.
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section_offset_type external_symbols_offset;
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// Symbol names.
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File_view* symbol_names;
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// Size of symbol name data in bytes.
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section_size_type symbol_names_size;
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// Version information. This is only used on dynamic objects.
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// Version symbol data (from SHT_GNU_versym section).
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File_view* versym;
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section_size_type versym_size;
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// Version definition data (from SHT_GNU_verdef section).
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File_view* verdef;
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section_size_type verdef_size;
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unsigned int verdef_info;
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// Needed version data (from SHT_GNU_verneed section).
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File_view* verneed;
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section_size_type verneed_size;
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unsigned int verneed_info;
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};
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// Information used to print error messages.
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struct Symbol_location_info
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{
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std::string source_file;
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std::string enclosing_symbol_name;
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int line_number;
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};
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// Data about a single relocation section. This is read in
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// read_relocs and processed in scan_relocs.
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struct Section_relocs
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{
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// Index of reloc section.
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unsigned int reloc_shndx;
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// Index of section that relocs apply to.
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unsigned int data_shndx;
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// Contents of reloc section.
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File_view* contents;
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// Reloc section type.
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unsigned int sh_type;
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// Number of reloc entries.
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size_t reloc_count;
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// Output section.
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Output_section* output_section;
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// Whether this section has special handling for offsets.
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bool needs_special_offset_handling;
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// Whether the data section is allocated (has the SHF_ALLOC flag set).
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bool is_data_section_allocated;
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};
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// Relocations in an object file. This is read in read_relocs and
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// processed in scan_relocs.
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struct Read_relocs_data
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{
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typedef std::vector<Section_relocs> Relocs_list;
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// The relocations.
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Relocs_list relocs;
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// The local symbols.
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File_view* local_symbols;
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};
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// Object is an abstract base class which represents either a 32-bit
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// or a 64-bit input object. This can be a regular object file
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// (ET_REL) or a shared object (ET_DYN).
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class Object
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{
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public:
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// NAME is the name of the object as we would report it to the user
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// (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is
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// used to read the file. OFFSET is the offset within the input
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// file--0 for a .o or .so file, something else for a .a file.
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Object(const std::string& name, Input_file* input_file, bool is_dynamic,
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off_t offset = 0)
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: name_(name), input_file_(input_file), offset_(offset), shnum_(-1U),
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is_dynamic_(is_dynamic), target_(NULL)
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{ input_file->file().add_object(); }
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virtual ~Object()
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{ this->input_file_->file().remove_object(); }
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// Return the name of the object as we would report it to the tuser.
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const std::string&
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name() const
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{ return this->name_; }
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// Get the offset into the file.
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off_t
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offset() const
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{ return this->offset_; }
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// Return whether this is a dynamic object.
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bool
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is_dynamic() const
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{ return this->is_dynamic_; }
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// Return the target structure associated with this object.
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Target*
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target() const
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{ return this->target_; }
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// Lock the underlying file.
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void
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lock(const Task* t)
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{ this->input_file()->file().lock(t); }
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// Unlock the underlying file.
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void
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unlock(const Task* t)
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{ this->input_file()->file().unlock(t); }
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// Return whether the underlying file is locked.
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bool
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is_locked() const
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{ return this->input_file()->file().is_locked(); }
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// Return the token, so that the task can be queued.
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Task_token*
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token()
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{ return this->input_file()->file().token(); }
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// Release the underlying file.
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void
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release()
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{ this->input_file_->file().release(); }
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// Return whether we should just read symbols from this file.
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bool
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just_symbols() const
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{ return this->input_file()->just_symbols(); }
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// Return the sized target structure associated with this object.
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// This is like the target method but it returns a pointer of
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// appropriate checked type.
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template<int size, bool big_endian>
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Sized_target<size, big_endian>*
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sized_target() const;
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// Get the number of sections.
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unsigned int
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shnum() const
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{ return this->shnum_; }
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// Return a view of the contents of a section. Set *PLEN to the
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// size. CACHE is a hint as in File_read::get_view.
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const unsigned char*
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section_contents(unsigned int shndx, section_size_type* plen, bool cache);
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// Return the size of a section given a section index.
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uint64_t
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section_size(unsigned int shndx)
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{ return this->do_section_size(shndx); }
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// Return the name of a section given a section index.
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std::string
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section_name(unsigned int shndx)
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{ return this->do_section_name(shndx); }
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// Return the section flags given a section index.
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uint64_t
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section_flags(unsigned int shndx)
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{ return this->do_section_flags(shndx); }
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// Return the section address given a section index.
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uint64_t
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section_address(unsigned int shndx)
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{ return this->do_section_address(shndx); }
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// Return the section type given a section index.
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unsigned int
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section_type(unsigned int shndx)
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{ return this->do_section_type(shndx); }
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// Return the section link field given a section index.
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unsigned int
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section_link(unsigned int shndx)
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{ return this->do_section_link(shndx); }
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// Return the section info field given a section index.
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unsigned int
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section_info(unsigned int shndx)
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{ return this->do_section_info(shndx); }
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// Return the required section alignment given a section index.
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uint64_t
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section_addralign(unsigned int shndx)
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{ return this->do_section_addralign(shndx); }
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// Read the symbol information.
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void
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read_symbols(Read_symbols_data* sd)
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{ return this->do_read_symbols(sd); }
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// Pass sections which should be included in the link to the Layout
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// object, and record where the sections go in the output file.
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void
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layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd)
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{ this->do_layout(symtab, layout, sd); }
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// Add symbol information to the global symbol table.
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void
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add_symbols(Symbol_table* symtab, Read_symbols_data* sd)
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{ this->do_add_symbols(symtab, sd); }
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// Functions and types for the elfcpp::Elf_file interface. This
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// permit us to use Object as the File template parameter for
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// elfcpp::Elf_file.
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// The View class is returned by view. It must support a single
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// method, data(). This is trivial, because get_view does what we
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// need.
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class View
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{
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public:
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View(const unsigned char* p)
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: p_(p)
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{ }
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const unsigned char*
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data() const
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{ return this->p_; }
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private:
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const unsigned char* p_;
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};
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// Return a View.
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View
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view(off_t file_offset, section_size_type data_size)
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{ return View(this->get_view(file_offset, data_size, true)); }
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// Report an error.
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void
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error(const char* format, ...) const ATTRIBUTE_PRINTF_2;
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// A location in the file.
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struct Location
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{
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off_t file_offset;
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off_t data_size;
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Location(off_t fo, section_size_type ds)
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: file_offset(fo), data_size(ds)
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{ }
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};
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// Get a View given a Location.
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View view(Location loc)
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{ return View(this->get_view(loc.file_offset, loc.data_size, true)); }
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// Get a view into the underlying file.
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const unsigned char*
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get_view(off_t start, section_size_type size, bool cache)
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{
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return this->input_file()->file().get_view(start + this->offset_, size,
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cache);
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}
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// Get a lasting view into the underlying file.
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File_view*
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get_lasting_view(off_t start, section_size_type size, bool cache)
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{
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return this->input_file()->file().get_lasting_view(start + this->offset_,
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size, cache);
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}
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// Read data from the underlying file.
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void
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read(off_t start, section_size_type size, void* p) const
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{ this->input_file()->file().read(start + this->offset_, size, p); }
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// Read multiple data from the underlying file.
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void
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read_multiple(const File_read::Read_multiple& rm)
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{ this->input_file()->file().read_multiple(this->offset_, rm); }
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// Stop caching views in the underlying file.
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void
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clear_view_cache_marks()
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{ this->input_file()->file().clear_view_cache_marks(); }
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protected:
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// Read the symbols--implemented by child class.
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virtual void
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do_read_symbols(Read_symbols_data*) = 0;
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// Lay out sections--implemented by child class.
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virtual void
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do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0;
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// Add symbol information to the global symbol table--implemented by
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// child class.
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virtual void
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do_add_symbols(Symbol_table*, Read_symbols_data*) = 0;
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// Return the location of the contents of a section. Implemented by
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// child class.
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virtual Location
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do_section_contents(unsigned int shndx) = 0;
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// Get the size of a section--implemented by child class.
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virtual uint64_t
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do_section_size(unsigned int shndx) = 0;
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// Get the name of a section--implemented by child class.
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virtual std::string
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do_section_name(unsigned int shndx) = 0;
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// Get section flags--implemented by child class.
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virtual uint64_t
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do_section_flags(unsigned int shndx) = 0;
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// Get section address--implemented by child class.
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virtual uint64_t
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do_section_address(unsigned int shndx) = 0;
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// Get section type--implemented by child class.
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virtual unsigned int
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do_section_type(unsigned int shndx) = 0;
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// Get section link field--implemented by child class.
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virtual unsigned int
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do_section_link(unsigned int shndx) = 0;
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// Get section info field--implemented by child class.
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virtual unsigned int
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do_section_info(unsigned int shndx) = 0;
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// Get section alignment--implemented by child class.
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virtual uint64_t
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do_section_addralign(unsigned int shndx) = 0;
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// Get the file. We pass on const-ness.
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Input_file*
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input_file()
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{ return this->input_file_; }
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const Input_file*
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input_file() const
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{ return this->input_file_; }
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// Set the target.
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void
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set_target(int machine, int size, bool big_endian, int osabi,
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int abiversion);
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// Set the number of sections.
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void
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set_shnum(int shnum)
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{ this->shnum_ = shnum; }
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// Functions used by both Sized_relobj and Sized_dynobj.
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// Read the section data into a Read_symbols_data object.
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template<int size, bool big_endian>
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void
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read_section_data(elfcpp::Elf_file<size, big_endian, Object>*,
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Read_symbols_data*);
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// If NAME is the name of a special .gnu.warning section, arrange
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// for the warning to be issued. SHNDX is the section index.
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// Return whether it is a warning section.
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bool
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handle_gnu_warning_section(const char* name, unsigned int shndx,
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Symbol_table*);
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private:
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// This class may not be copied.
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Object(const Object&);
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Object& operator=(const Object&);
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// Name of object as printed to user.
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std::string name_;
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// For reading the file.
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Input_file* input_file_;
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// Offset within the file--0 for an object file, non-0 for an
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// archive.
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off_t offset_;
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// Number of input sections.
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unsigned int shnum_;
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// Whether this is a dynamic object.
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bool is_dynamic_;
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// Target functions--may be NULL if the target is not known.
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Target* target_;
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};
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// Implement sized_target inline for efficiency. This approach breaks
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// static type checking, but is made safe using asserts.
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template<int size, bool big_endian>
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inline Sized_target<size, big_endian>*
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Object::sized_target() const
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{
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gold_assert(this->target_->get_size() == size);
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gold_assert(this->target_->is_big_endian() ? big_endian : !big_endian);
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return static_cast<Sized_target<size, big_endian>*>(this->target_);
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}
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// A regular object (ET_REL). This is an abstract base class itself.
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// The implementation is the template class Sized_relobj.
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class Relobj : public Object
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{
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public:
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Relobj(const std::string& name, Input_file* input_file, off_t offset = 0)
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: Object(name, input_file, false, offset),
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map_to_output_(),
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map_to_relocatable_relocs_(NULL),
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object_merge_map_(NULL),
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relocs_must_follow_section_writes_(false)
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{ }
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// Read the relocs.
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void
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read_relocs(Read_relocs_data* rd)
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{ return this->do_read_relocs(rd); }
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// Scan the relocs and adjust the symbol table.
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void
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scan_relocs(const General_options& options, Symbol_table* symtab,
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Layout* layout, Read_relocs_data* rd)
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{ return this->do_scan_relocs(options, symtab, layout, rd); }
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// The number of local symbols in the input symbol table.
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virtual unsigned int
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local_symbol_count() const
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{ return this->do_local_symbol_count(); }
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// Initial local symbol processing: count the number of local symbols
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// in the output symbol table and dynamic symbol table; add local symbol
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// names to *POOL and *DYNPOOL.
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void
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count_local_symbols(Stringpool_template<char>* pool,
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Stringpool_template<char>* dynpool)
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{ return this->do_count_local_symbols(pool, dynpool); }
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// Set the values of the local symbols, set the output symbol table
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// indexes for the local variables, and set the offset where local
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// symbol information will be stored. Returns the new local symbol index.
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unsigned int
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finalize_local_symbols(unsigned int index, off_t off)
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{ return this->do_finalize_local_symbols(index, off); }
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// Set the output dynamic symbol table indexes for the local variables.
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unsigned int
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set_local_dynsym_indexes(unsigned int index)
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{ return this->do_set_local_dynsym_indexes(index); }
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// Set the offset where local dynamic symbol information will be stored.
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unsigned int
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set_local_dynsym_offset(off_t off)
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{ return this->do_set_local_dynsym_offset(off); }
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// Relocate the input sections and write out the local symbols.
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void
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relocate(const General_options& options, const Symbol_table* symtab,
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const Layout* layout, Output_file* of)
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{ return this->do_relocate(options, symtab, layout, of); }
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// Return whether an input section is being included in the link.
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bool
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is_section_included(unsigned int shndx) const
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{
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gold_assert(shndx < this->map_to_output_.size());
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return this->map_to_output_[shndx].output_section != NULL;
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}
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// Return whether an input section requires special
|
|
// handling--whether it is not simply mapped from the input file to
|
|
// the output file.
|
|
bool
|
|
is_section_specially_mapped(unsigned int shndx) const
|
|
{
|
|
gold_assert(shndx < this->map_to_output_.size());
|
|
return (this->map_to_output_[shndx].output_section != NULL
|
|
&& this->map_to_output_[shndx].offset == -1);
|
|
}
|
|
|
|
// Given a section index, return the corresponding Output_section
|
|
// (which will be NULL if the section is not included in the link)
|
|
// and set *POFF to the offset within that section. *POFF will be
|
|
// set to -1 if the section requires special handling.
|
|
inline Output_section*
|
|
output_section(unsigned int shndx, section_offset_type* poff) const;
|
|
|
|
// Set the offset of an input section within its output section.
|
|
void
|
|
set_section_offset(unsigned int shndx, section_offset_type off)
|
|
{
|
|
gold_assert(shndx < this->map_to_output_.size());
|
|
this->map_to_output_[shndx].offset = off;
|
|
}
|
|
|
|
// Return true if we need to wait for output sections to be written
|
|
// before we can apply relocations. This is true if the object has
|
|
// any relocations for sections which require special handling, such
|
|
// as the exception frame section.
|
|
bool
|
|
relocs_must_follow_section_writes() const
|
|
{ return this->relocs_must_follow_section_writes_; }
|
|
|
|
// Return the object merge map.
|
|
Object_merge_map*
|
|
merge_map() const
|
|
{ return this->object_merge_map_; }
|
|
|
|
// Set the object merge map.
|
|
void
|
|
set_merge_map(Object_merge_map* object_merge_map)
|
|
{
|
|
gold_assert(this->object_merge_map_ == NULL);
|
|
this->object_merge_map_ = object_merge_map;
|
|
}
|
|
|
|
// Record the relocatable reloc info for an input reloc section.
|
|
void
|
|
set_relocatable_relocs(unsigned int reloc_shndx, Relocatable_relocs* rr)
|
|
{
|
|
gold_assert(reloc_shndx < this->shnum());
|
|
(*this->map_to_relocatable_relocs_)[reloc_shndx] = rr;
|
|
}
|
|
|
|
// Get the relocatable reloc info for an input reloc section.
|
|
Relocatable_relocs*
|
|
relocatable_relocs(unsigned int reloc_shndx)
|
|
{
|
|
gold_assert(reloc_shndx < this->shnum());
|
|
return (*this->map_to_relocatable_relocs_)[reloc_shndx];
|
|
}
|
|
|
|
protected:
|
|
// What we need to know to map an input section to an output
|
|
// section. We keep an array of these, one for each input section,
|
|
// indexed by the input section number.
|
|
struct Map_to_output
|
|
{
|
|
// The output section. This is NULL if the input section is to be
|
|
// discarded.
|
|
Output_section* output_section;
|
|
// The offset within the output section. This is -1 if the
|
|
// section requires special handling.
|
|
section_offset_type offset;
|
|
};
|
|
|
|
// Read the relocs--implemented by child class.
|
|
virtual void
|
|
do_read_relocs(Read_relocs_data*) = 0;
|
|
|
|
// Scan the relocs--implemented by child class.
|
|
virtual void
|
|
do_scan_relocs(const General_options&, Symbol_table*, Layout*,
|
|
Read_relocs_data*) = 0;
|
|
|
|
// Return the number of local symbols--implemented by child class.
|
|
virtual unsigned int
|
|
do_local_symbol_count() const = 0;
|
|
|
|
// Count local symbols--implemented by child class.
|
|
virtual void
|
|
do_count_local_symbols(Stringpool_template<char>*,
|
|
Stringpool_template<char>*) = 0;
|
|
|
|
// Finalize the local symbols. Set the output symbol table indexes
|
|
// for the local variables, and set the offset where local symbol
|
|
// information will be stored.
|
|
virtual unsigned int
|
|
do_finalize_local_symbols(unsigned int, off_t) = 0;
|
|
|
|
// Set the output dynamic symbol table indexes for the local variables.
|
|
virtual unsigned int
|
|
do_set_local_dynsym_indexes(unsigned int) = 0;
|
|
|
|
// Set the offset where local dynamic symbol information will be stored.
|
|
virtual unsigned int
|
|
do_set_local_dynsym_offset(off_t) = 0;
|
|
|
|
// Relocate the input sections and write out the local
|
|
// symbols--implemented by child class.
|
|
virtual void
|
|
do_relocate(const General_options& options, const Symbol_table* symtab,
|
|
const Layout*, Output_file* of) = 0;
|
|
|
|
// Return the vector mapping input sections to output sections.
|
|
std::vector<Map_to_output>&
|
|
map_to_output()
|
|
{ return this->map_to_output_; }
|
|
|
|
const std::vector<Map_to_output>&
|
|
map_to_output() const
|
|
{ return this->map_to_output_; }
|
|
|
|
// Set the size of the relocatable relocs array.
|
|
void
|
|
size_relocatable_relocs()
|
|
{
|
|
this->map_to_relocatable_relocs_ =
|
|
new std::vector<Relocatable_relocs*>(this->shnum());
|
|
}
|
|
|
|
// Record that we must wait for the output sections to be written
|
|
// before applying relocations.
|
|
void
|
|
set_relocs_must_follow_section_writes()
|
|
{ this->relocs_must_follow_section_writes_ = true; }
|
|
|
|
private:
|
|
// Mapping from input sections to output section.
|
|
std::vector<Map_to_output> map_to_output_;
|
|
// Mapping from input section index to the information recorded for
|
|
// the relocations. This is only used for a relocatable link.
|
|
std::vector<Relocatable_relocs*>* map_to_relocatable_relocs_;
|
|
// Mappings for merge sections. This is managed by the code in the
|
|
// Merge_map class.
|
|
Object_merge_map* object_merge_map_;
|
|
// Whether we need to wait for output sections to be written before
|
|
// we can apply relocations.
|
|
bool relocs_must_follow_section_writes_;
|
|
};
|
|
|
|
// Implement Object::output_section inline for efficiency.
|
|
inline Output_section*
|
|
Relobj::output_section(unsigned int shndx, section_offset_type* poff) const
|
|
{
|
|
gold_assert(shndx < this->map_to_output_.size());
|
|
const Map_to_output& mo(this->map_to_output_[shndx]);
|
|
*poff = mo.offset;
|
|
return mo.output_section;
|
|
}
|
|
|
|
// This class is used to handle relocations against a section symbol
|
|
// in an SHF_MERGE section. For such a symbol, we need to know the
|
|
// addend of the relocation before we can determine the final value.
|
|
// The addend gives us the location in the input section, and we can
|
|
// determine how it is mapped to the output section. For a
|
|
// non-section symbol, we apply the addend to the final value of the
|
|
// symbol; that is done in finalize_local_symbols, and does not use
|
|
// this class.
|
|
|
|
template<int size>
|
|
class Merged_symbol_value
|
|
{
|
|
public:
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Value;
|
|
|
|
// We use a hash table to map offsets in the input section to output
|
|
// addresses.
|
|
typedef Unordered_map<section_offset_type, Value> Output_addresses;
|
|
|
|
Merged_symbol_value(Value input_value, Value output_start_address)
|
|
: input_value_(input_value), output_start_address_(output_start_address),
|
|
output_addresses_()
|
|
{ }
|
|
|
|
// Initialize the hash table.
|
|
void
|
|
initialize_input_to_output_map(const Relobj*, unsigned int input_shndx);
|
|
|
|
// Release the hash table to save space.
|
|
void
|
|
free_input_to_output_map()
|
|
{ this->output_addresses_.clear(); }
|
|
|
|
// Get the output value corresponding to an addend. The object and
|
|
// input section index are passed in because the caller will have
|
|
// them; otherwise we could store them here.
|
|
Value
|
|
value(const Relobj* object, unsigned int input_shndx, Value addend) const
|
|
{
|
|
Value input_offset = this->input_value_ + addend;
|
|
typename Output_addresses::const_iterator p =
|
|
this->output_addresses_.find(input_offset);
|
|
if (p != this->output_addresses_.end())
|
|
return p->second;
|
|
|
|
return this->value_from_output_section(object, input_shndx, input_offset);
|
|
}
|
|
|
|
private:
|
|
// Get the output value for an input offset if we couldn't find it
|
|
// in the hash table.
|
|
Value
|
|
value_from_output_section(const Relobj*, unsigned int input_shndx,
|
|
Value input_offset) const;
|
|
|
|
// The value of the section symbol in the input file. This is
|
|
// normally zero, but could in principle be something else.
|
|
Value input_value_;
|
|
// The start address of this merged section in the output file.
|
|
Value output_start_address_;
|
|
// A hash table which maps offsets in the input section to output
|
|
// addresses. This only maps specific offsets, not all offsets.
|
|
Output_addresses output_addresses_;
|
|
};
|
|
|
|
// This POD class is holds the value of a symbol. This is used for
|
|
// local symbols, and for all symbols during relocation processing.
|
|
// For special sections, such as SHF_MERGE sections, this calls a
|
|
// function to get the final symbol value.
|
|
|
|
template<int size>
|
|
class Symbol_value
|
|
{
|
|
public:
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Value;
|
|
|
|
Symbol_value()
|
|
: output_symtab_index_(0), output_dynsym_index_(-1U), input_shndx_(0),
|
|
is_section_symbol_(false), is_tls_symbol_(false),
|
|
has_output_value_(true)
|
|
{ this->u_.value = 0; }
|
|
|
|
// Get the value of this symbol. OBJECT is the object in which this
|
|
// symbol is defined, and ADDEND is an addend to add to the value.
|
|
template<bool big_endian>
|
|
Value
|
|
value(const Sized_relobj<size, big_endian>* object, Value addend) const
|
|
{
|
|
if (this->has_output_value_)
|
|
return this->u_.value + addend;
|
|
else
|
|
return this->u_.merged_symbol_value->value(object, this->input_shndx_,
|
|
addend);
|
|
}
|
|
|
|
// Set the value of this symbol in the output symbol table.
|
|
void
|
|
set_output_value(Value value)
|
|
{ this->u_.value = value; }
|
|
|
|
// For a section symbol in a merged section, we need more
|
|
// information.
|
|
void
|
|
set_merged_symbol_value(Merged_symbol_value<size>* msv)
|
|
{
|
|
gold_assert(this->is_section_symbol_);
|
|
this->has_output_value_ = false;
|
|
this->u_.merged_symbol_value = msv;
|
|
}
|
|
|
|
// Initialize the input to output map for a section symbol in a
|
|
// merged section. We also initialize the value of a non-section
|
|
// symbol in a merged section.
|
|
void
|
|
initialize_input_to_output_map(const Relobj* object)
|
|
{
|
|
if (!this->has_output_value_)
|
|
{
|
|
gold_assert(this->is_section_symbol_);
|
|
Merged_symbol_value<size>* msv = this->u_.merged_symbol_value;
|
|
msv->initialize_input_to_output_map(object, this->input_shndx_);
|
|
}
|
|
}
|
|
|
|
// Free the input to output map for a section symbol in a merged
|
|
// section.
|
|
void
|
|
free_input_to_output_map()
|
|
{
|
|
if (!this->has_output_value_)
|
|
this->u_.merged_symbol_value->free_input_to_output_map();
|
|
}
|
|
|
|
// Set the value of the symbol from the input file. This is only
|
|
// called by count_local_symbols, to communicate the value to
|
|
// finalize_local_symbols.
|
|
void
|
|
set_input_value(Value value)
|
|
{ this->u_.value = value; }
|
|
|
|
// Return the input value. This is only called by
|
|
// finalize_local_symbols.
|
|
Value
|
|
input_value() const
|
|
{ return this->u_.value; }
|
|
|
|
// Return whether this symbol should go into the output symbol
|
|
// table.
|
|
bool
|
|
needs_output_symtab_entry() const
|
|
{ return this->output_symtab_index_ != -1U; }
|
|
|
|
// Return the index in the output symbol table.
|
|
unsigned int
|
|
output_symtab_index() const
|
|
{
|
|
gold_assert(this->output_symtab_index_ != 0);
|
|
return this->output_symtab_index_;
|
|
}
|
|
|
|
// Set the index in the output symbol table.
|
|
void
|
|
set_output_symtab_index(unsigned int i)
|
|
{
|
|
gold_assert(this->output_symtab_index_ == 0);
|
|
this->output_symtab_index_ = i;
|
|
}
|
|
|
|
// Record that this symbol should not go into the output symbol
|
|
// table.
|
|
void
|
|
set_no_output_symtab_entry()
|
|
{
|
|
gold_assert(this->output_symtab_index_ == 0);
|
|
this->output_symtab_index_ = -1U;
|
|
}
|
|
|
|
// Set the index in the output dynamic symbol table.
|
|
void
|
|
set_needs_output_dynsym_entry()
|
|
{
|
|
gold_assert(!this->is_section_symbol());
|
|
this->output_dynsym_index_ = 0;
|
|
}
|
|
|
|
// Return whether this symbol should go into the output symbol
|
|
// table.
|
|
bool
|
|
needs_output_dynsym_entry() const
|
|
{
|
|
return this->output_dynsym_index_ != -1U;
|
|
}
|
|
|
|
// Record that this symbol should go into the dynamic symbol table.
|
|
void
|
|
set_output_dynsym_index(unsigned int i)
|
|
{
|
|
gold_assert(this->output_dynsym_index_ == 0);
|
|
this->output_dynsym_index_ = i;
|
|
}
|
|
|
|
// Return the index in the output dynamic symbol table.
|
|
unsigned int
|
|
output_dynsym_index() const
|
|
{
|
|
gold_assert(this->output_dynsym_index_ != 0
|
|
&& this->output_dynsym_index_ != -1U);
|
|
return this->output_dynsym_index_;
|
|
}
|
|
|
|
// Set the index of the input section in the input file.
|
|
void
|
|
set_input_shndx(unsigned int i)
|
|
{
|
|
this->input_shndx_ = i;
|
|
// input_shndx_ field is a bitfield, so make sure that the value
|
|
// fits.
|
|
gold_assert(this->input_shndx_ == i);
|
|
}
|
|
|
|
// Return the index of the input section in the input file.
|
|
unsigned int
|
|
input_shndx() const
|
|
{ return this->input_shndx_; }
|
|
|
|
// Whether this is a section symbol.
|
|
bool
|
|
is_section_symbol() const
|
|
{ return this->is_section_symbol_; }
|
|
|
|
// Record that this is a section symbol.
|
|
void
|
|
set_is_section_symbol()
|
|
{
|
|
gold_assert(!this->needs_output_dynsym_entry());
|
|
this->is_section_symbol_ = true;
|
|
}
|
|
|
|
// Record that this is a TLS symbol.
|
|
void
|
|
set_is_tls_symbol()
|
|
{ this->is_tls_symbol_ = true; }
|
|
|
|
// Return TRUE if this is a TLS symbol.
|
|
bool
|
|
is_tls_symbol() const
|
|
{ return this->is_tls_symbol_; }
|
|
|
|
private:
|
|
// The index of this local symbol in the output symbol table. This
|
|
// will be -1 if the symbol should not go into the symbol table.
|
|
unsigned int output_symtab_index_;
|
|
// The index of this local symbol in the dynamic symbol table. This
|
|
// will be -1 if the symbol should not go into the symbol table.
|
|
unsigned int output_dynsym_index_;
|
|
// The section index in the input file in which this symbol is
|
|
// defined.
|
|
unsigned int input_shndx_ : 29;
|
|
// Whether this is a STT_SECTION symbol.
|
|
bool is_section_symbol_ : 1;
|
|
// Whether this is a STT_TLS symbol.
|
|
bool is_tls_symbol_ : 1;
|
|
// Whether this symbol has a value for the output file. This is
|
|
// normally set to true during Layout::finalize, by
|
|
// finalize_local_symbols. It will be false for a section symbol in
|
|
// a merge section, as for such symbols we can not determine the
|
|
// value to use in a relocation until we see the addend.
|
|
bool has_output_value_ : 1;
|
|
union
|
|
{
|
|
// This is used if has_output_value_ is true. Between
|
|
// count_local_symbols and finalize_local_symbols, this is the
|
|
// value in the input file. After finalize_local_symbols, it is
|
|
// the value in the output file.
|
|
Value value;
|
|
// This is used if has_output_value_ is false. It points to the
|
|
// information we need to get the value for a merge section.
|
|
Merged_symbol_value<size>* merged_symbol_value;
|
|
} u_;
|
|
};
|
|
|
|
// A GOT offset list. A symbol may have more than one GOT offset
|
|
// (e.g., when mixing modules compiled with two different TLS models),
|
|
// but will usually have at most one. GOT_TYPE identifies the type of
|
|
// GOT entry; its values are specific to each target.
|
|
|
|
class Got_offset_list
|
|
{
|
|
public:
|
|
Got_offset_list()
|
|
: got_type_(-1U), got_offset_(0), got_next_(NULL)
|
|
{ }
|
|
|
|
Got_offset_list(unsigned int got_type, unsigned int got_offset)
|
|
: got_type_(got_type), got_offset_(got_offset), got_next_(NULL)
|
|
{ }
|
|
|
|
~Got_offset_list()
|
|
{
|
|
if (this->got_next_ != NULL)
|
|
{
|
|
delete this->got_next_;
|
|
this->got_next_ = NULL;
|
|
}
|
|
}
|
|
|
|
// Initialize the fields to their default values.
|
|
void
|
|
init()
|
|
{
|
|
this->got_type_ = -1U;
|
|
this->got_offset_ = 0;
|
|
this->got_next_ = NULL;
|
|
}
|
|
|
|
// Set the offset for the GOT entry of type GOT_TYPE.
|
|
void
|
|
set_offset(unsigned int got_type, unsigned int got_offset)
|
|
{
|
|
if (this->got_type_ == -1U)
|
|
{
|
|
this->got_type_ = got_type;
|
|
this->got_offset_ = got_offset;
|
|
}
|
|
else
|
|
{
|
|
for (Got_offset_list* g = this; g != NULL; g = g->got_next_)
|
|
{
|
|
if (g->got_type_ == got_type)
|
|
{
|
|
g->got_offset_ = got_offset;
|
|
return;
|
|
}
|
|
}
|
|
Got_offset_list* g = new Got_offset_list(got_type, got_offset);
|
|
g->got_next_ = this->got_next_;
|
|
this->got_next_ = g;
|
|
}
|
|
}
|
|
|
|
// Return the offset for a GOT entry of type GOT_TYPE.
|
|
unsigned int
|
|
get_offset(unsigned int got_type) const
|
|
{
|
|
for (const Got_offset_list* g = this; g != NULL; g = g->got_next_)
|
|
{
|
|
if (g->got_type_ == got_type)
|
|
return g->got_offset_;
|
|
}
|
|
return -1U;
|
|
}
|
|
|
|
private:
|
|
unsigned int got_type_;
|
|
unsigned int got_offset_;
|
|
Got_offset_list* got_next_;
|
|
};
|
|
|
|
// A regular object file. This is size and endian specific.
|
|
|
|
template<int size, bool big_endian>
|
|
class Sized_relobj : public Relobj
|
|
{
|
|
public:
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
|
|
typedef std::vector<Symbol*> Symbols;
|
|
typedef std::vector<Symbol_value<size> > Local_values;
|
|
|
|
Sized_relobj(const std::string& name, Input_file* input_file, off_t offset,
|
|
const typename elfcpp::Ehdr<size, big_endian>&);
|
|
|
|
~Sized_relobj();
|
|
|
|
// Set up the object file based on the ELF header.
|
|
void
|
|
setup(const typename elfcpp::Ehdr<size, big_endian>&);
|
|
|
|
// If SYM is the index of a global symbol in the object file's
|
|
// symbol table, return the Symbol object. Otherwise, return NULL.
|
|
Symbol*
|
|
global_symbol(unsigned int sym) const
|
|
{
|
|
if (sym >= this->local_symbol_count_)
|
|
{
|
|
gold_assert(sym - this->local_symbol_count_ < this->symbols_.size());
|
|
return this->symbols_[sym - this->local_symbol_count_];
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
// Return the section index of symbol SYM. Set *VALUE to its value
|
|
// in the object file. Note that for a symbol which is not defined
|
|
// in this object file, this will set *VALUE to 0 and return
|
|
// SHN_UNDEF; it will not return the final value of the symbol in
|
|
// the link.
|
|
unsigned int
|
|
symbol_section_and_value(unsigned int sym, Address* value);
|
|
|
|
// Return a pointer to the Symbol_value structure which holds the
|
|
// value of a local symbol.
|
|
const Symbol_value<size>*
|
|
local_symbol(unsigned int sym) const
|
|
{
|
|
gold_assert(sym < this->local_values_.size());
|
|
return &this->local_values_[sym];
|
|
}
|
|
|
|
// Return the index of local symbol SYM in the ordinary symbol
|
|
// table. A value of -1U means that the symbol is not being output.
|
|
unsigned int
|
|
symtab_index(unsigned int sym) const
|
|
{
|
|
gold_assert(sym < this->local_values_.size());
|
|
return this->local_values_[sym].output_symtab_index();
|
|
}
|
|
|
|
// Return the index of local symbol SYM in the dynamic symbol
|
|
// table. A value of -1U means that the symbol is not being output.
|
|
unsigned int
|
|
dynsym_index(unsigned int sym) const
|
|
{
|
|
gold_assert(sym < this->local_values_.size());
|
|
return this->local_values_[sym].output_dynsym_index();
|
|
}
|
|
|
|
// Return the input section index of local symbol SYM.
|
|
unsigned int
|
|
local_symbol_input_shndx(unsigned int sym) const
|
|
{
|
|
gold_assert(sym < this->local_values_.size());
|
|
return this->local_values_[sym].input_shndx();
|
|
}
|
|
|
|
// Return the appropriate Sized_target structure.
|
|
Sized_target<size, big_endian>*
|
|
sized_target()
|
|
{ return this->Object::sized_target<size, big_endian>(); }
|
|
|
|
// Record that local symbol SYM needs a dynamic symbol entry.
|
|
void
|
|
set_needs_output_dynsym_entry(unsigned int sym)
|
|
{
|
|
gold_assert(sym < this->local_values_.size());
|
|
this->local_values_[sym].set_needs_output_dynsym_entry();
|
|
}
|
|
|
|
// Return whether the local symbol SYMNDX has a GOT offset.
|
|
// For TLS symbols, the GOT entry will hold its tp-relative offset.
|
|
bool
|
|
local_has_got_offset(unsigned int symndx, unsigned int got_type) const
|
|
{
|
|
Local_got_offsets::const_iterator p =
|
|
this->local_got_offsets_.find(symndx);
|
|
return (p != this->local_got_offsets_.end()
|
|
&& p->second->get_offset(got_type) != -1U);
|
|
}
|
|
|
|
// Return the GOT offset of the local symbol SYMNDX.
|
|
unsigned int
|
|
local_got_offset(unsigned int symndx, unsigned int got_type) const
|
|
{
|
|
Local_got_offsets::const_iterator p =
|
|
this->local_got_offsets_.find(symndx);
|
|
gold_assert(p != this->local_got_offsets_.end());
|
|
unsigned int off = p->second->get_offset(got_type);
|
|
gold_assert(off != -1U);
|
|
return off;
|
|
}
|
|
|
|
// Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET.
|
|
void
|
|
set_local_got_offset(unsigned int symndx, unsigned int got_type,
|
|
unsigned int got_offset)
|
|
{
|
|
Local_got_offsets::const_iterator p =
|
|
this->local_got_offsets_.find(symndx);
|
|
if (p != this->local_got_offsets_.end())
|
|
p->second->set_offset(got_type, got_offset);
|
|
else
|
|
{
|
|
Got_offset_list* g = new Got_offset_list(got_type, got_offset);
|
|
std::pair<Local_got_offsets::iterator, bool> ins =
|
|
this->local_got_offsets_.insert(std::make_pair(symndx, g));
|
|
gold_assert(ins.second);
|
|
}
|
|
}
|
|
|
|
// Return the name of the symbol that spans the given offset in the
|
|
// specified section in this object. This is used only for error
|
|
// messages and is not particularly efficient.
|
|
bool
|
|
get_symbol_location_info(unsigned int shndx, off_t offset,
|
|
Symbol_location_info* info);
|
|
|
|
protected:
|
|
// Read the symbols.
|
|
void
|
|
do_read_symbols(Read_symbols_data*);
|
|
|
|
// Return the number of local symbols.
|
|
unsigned int
|
|
do_local_symbol_count() const
|
|
{ return this->local_symbol_count_; }
|
|
|
|
// Lay out the input sections.
|
|
void
|
|
do_layout(Symbol_table*, Layout*, Read_symbols_data*);
|
|
|
|
// Add the symbols to the symbol table.
|
|
void
|
|
do_add_symbols(Symbol_table*, Read_symbols_data*);
|
|
|
|
// Read the relocs.
|
|
void
|
|
do_read_relocs(Read_relocs_data*);
|
|
|
|
// Scan the relocs and adjust the symbol table.
|
|
void
|
|
do_scan_relocs(const General_options&, Symbol_table*, Layout*,
|
|
Read_relocs_data*);
|
|
|
|
// Count the local symbols.
|
|
void
|
|
do_count_local_symbols(Stringpool_template<char>*,
|
|
Stringpool_template<char>*);
|
|
|
|
// Finalize the local symbols.
|
|
unsigned int
|
|
do_finalize_local_symbols(unsigned int, off_t);
|
|
|
|
// Set the offset where local dynamic symbol information will be stored.
|
|
unsigned int
|
|
do_set_local_dynsym_indexes(unsigned int);
|
|
|
|
// Set the offset where local dynamic symbol information will be stored.
|
|
unsigned int
|
|
do_set_local_dynsym_offset(off_t);
|
|
|
|
// Relocate the input sections and write out the local symbols.
|
|
void
|
|
do_relocate(const General_options& options, const Symbol_table* symtab,
|
|
const Layout*, Output_file* of);
|
|
|
|
// Get the size of a section.
|
|
uint64_t
|
|
do_section_size(unsigned int shndx)
|
|
{ return this->elf_file_.section_size(shndx); }
|
|
|
|
// Get the name of a section.
|
|
std::string
|
|
do_section_name(unsigned int shndx)
|
|
{ return this->elf_file_.section_name(shndx); }
|
|
|
|
// Return the location of the contents of a section.
|
|
Object::Location
|
|
do_section_contents(unsigned int shndx)
|
|
{ return this->elf_file_.section_contents(shndx); }
|
|
|
|
// Return section flags.
|
|
uint64_t
|
|
do_section_flags(unsigned int shndx)
|
|
{ return this->elf_file_.section_flags(shndx); }
|
|
|
|
// Return section address.
|
|
uint64_t
|
|
do_section_address(unsigned int shndx)
|
|
{ return this->elf_file_.section_addr(shndx); }
|
|
|
|
// Return section type.
|
|
unsigned int
|
|
do_section_type(unsigned int shndx)
|
|
{ return this->elf_file_.section_type(shndx); }
|
|
|
|
// Return the section link field.
|
|
unsigned int
|
|
do_section_link(unsigned int shndx)
|
|
{ return this->elf_file_.section_link(shndx); }
|
|
|
|
// Return the section info field.
|
|
unsigned int
|
|
do_section_info(unsigned int shndx)
|
|
{ return this->elf_file_.section_info(shndx); }
|
|
|
|
// Return the section alignment.
|
|
uint64_t
|
|
do_section_addralign(unsigned int shndx)
|
|
{ return this->elf_file_.section_addralign(shndx); }
|
|
|
|
private:
|
|
// For convenience.
|
|
typedef Sized_relobj<size, big_endian> This;
|
|
static const int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size;
|
|
static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
|
|
static const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
|
|
typedef elfcpp::Shdr<size, big_endian> Shdr;
|
|
|
|
// Find the SHT_SYMTAB section, given the section headers.
|
|
void
|
|
find_symtab(const unsigned char* pshdrs);
|
|
|
|
// Return whether SHDR has the right flags for a GNU style exception
|
|
// frame section.
|
|
bool
|
|
check_eh_frame_flags(const elfcpp::Shdr<size, big_endian>* shdr) const;
|
|
|
|
// Return whether there is a section named .eh_frame which might be
|
|
// a GNU style exception frame section.
|
|
bool
|
|
find_eh_frame(const unsigned char* pshdrs, const char* names,
|
|
section_size_type names_size) const;
|
|
|
|
// Whether to include a section group in the link.
|
|
bool
|
|
include_section_group(Symbol_table*, Layout*, unsigned int, const char*,
|
|
const elfcpp::Shdr<size, big_endian>&,
|
|
std::vector<bool>*);
|
|
|
|
// Whether to include a linkonce section in the link.
|
|
bool
|
|
include_linkonce_section(Layout*, const char*,
|
|
const elfcpp::Shdr<size, big_endian>&);
|
|
|
|
// Views and sizes when relocating.
|
|
struct View_size
|
|
{
|
|
unsigned char* view;
|
|
typename elfcpp::Elf_types<size>::Elf_Addr address;
|
|
off_t offset;
|
|
section_size_type view_size;
|
|
bool is_input_output_view;
|
|
bool is_postprocessing_view;
|
|
};
|
|
|
|
typedef std::vector<View_size> Views;
|
|
|
|
// Write section data to the output file. Record the views and
|
|
// sizes in VIEWS for use when relocating.
|
|
void
|
|
write_sections(const unsigned char* pshdrs, Output_file*, Views*);
|
|
|
|
// Relocate the sections in the output file.
|
|
void
|
|
relocate_sections(const General_options& options, const Symbol_table*,
|
|
const Layout*, const unsigned char* pshdrs, Views*);
|
|
|
|
// Scan the input relocations for --emit-relocs.
|
|
void
|
|
emit_relocs_scan(const General_options&, Symbol_table*, Layout*,
|
|
const unsigned char* plocal_syms,
|
|
const Read_relocs_data::Relocs_list::iterator&);
|
|
|
|
// Scan the input relocations for --emit-relocs, templatized on the
|
|
// type of the relocation section.
|
|
template<int sh_type>
|
|
void
|
|
emit_relocs_scan_reltype(const General_options&, Symbol_table*, Layout*,
|
|
const unsigned char* plocal_syms,
|
|
const Read_relocs_data::Relocs_list::iterator&,
|
|
Relocatable_relocs*);
|
|
|
|
// Emit the relocs for --emit-relocs.
|
|
void
|
|
emit_relocs(const Relocate_info<size, big_endian>*, unsigned int,
|
|
unsigned int sh_type, const unsigned char* prelocs,
|
|
size_t reloc_count, Output_section*, off_t output_offset,
|
|
unsigned char* view, Address address,
|
|
section_size_type view_size,
|
|
unsigned char* reloc_view, section_size_type reloc_view_size);
|
|
|
|
// Emit the relocs for --emit-relocs, templatized on the type of the
|
|
// relocation section.
|
|
template<int sh_type>
|
|
void
|
|
emit_relocs_reltype(const Relocate_info<size, big_endian>*, unsigned int,
|
|
const unsigned char* prelocs, size_t reloc_count,
|
|
Output_section*, off_t output_offset,
|
|
unsigned char* view, Address address,
|
|
section_size_type view_size,
|
|
unsigned char* reloc_view,
|
|
section_size_type reloc_view_size);
|
|
|
|
// Initialize input to output maps for section symbols in merged
|
|
// sections.
|
|
void
|
|
initialize_input_to_output_maps();
|
|
|
|
// Free the input to output maps for section symbols in merged
|
|
// sections.
|
|
void
|
|
free_input_to_output_maps();
|
|
|
|
// Write out the local symbols.
|
|
void
|
|
write_local_symbols(Output_file*,
|
|
const Stringpool_template<char>*,
|
|
const Stringpool_template<char>*);
|
|
|
|
// Clear the local symbol information.
|
|
void
|
|
clear_local_symbols()
|
|
{
|
|
this->local_values_.clear();
|
|
this->local_got_offsets_.clear();
|
|
}
|
|
|
|
// The GOT offsets of local symbols. This map also stores GOT offsets
|
|
// for tp-relative offsets for TLS symbols.
|
|
typedef Unordered_map<unsigned int, Got_offset_list*> Local_got_offsets;
|
|
|
|
// The TLS GOT offsets of local symbols. The map stores the offsets
|
|
// for either a single GOT entry that holds the module index of a TLS
|
|
// symbol, or a pair of GOT entries containing the module index and
|
|
// dtv-relative offset.
|
|
struct Tls_got_entry
|
|
{
|
|
Tls_got_entry(int got_offset, bool have_pair)
|
|
: got_offset_(got_offset),
|
|
have_pair_(have_pair)
|
|
{ }
|
|
int got_offset_;
|
|
bool have_pair_;
|
|
};
|
|
typedef Unordered_map<unsigned int, Tls_got_entry> Local_tls_got_offsets;
|
|
|
|
// General access to the ELF file.
|
|
elfcpp::Elf_file<size, big_endian, Object> elf_file_;
|
|
// Index of SHT_SYMTAB section.
|
|
unsigned int symtab_shndx_;
|
|
// The number of local symbols.
|
|
unsigned int local_symbol_count_;
|
|
// The number of local symbols which go into the output file.
|
|
unsigned int output_local_symbol_count_;
|
|
// The number of local symbols which go into the output file's dynamic
|
|
// symbol table.
|
|
unsigned int output_local_dynsym_count_;
|
|
// The entries in the symbol table for the external symbols.
|
|
Symbols symbols_;
|
|
// File offset for local symbols.
|
|
off_t local_symbol_offset_;
|
|
// File offset for local dynamic symbols.
|
|
off_t local_dynsym_offset_;
|
|
// Values of local symbols.
|
|
Local_values local_values_;
|
|
// GOT offsets for local non-TLS symbols, and tp-relative offsets
|
|
// for TLS symbols, indexed by symbol number.
|
|
Local_got_offsets local_got_offsets_;
|
|
// Whether this object has a GNU style .eh_frame section.
|
|
bool has_eh_frame_;
|
|
};
|
|
|
|
// A class to manage the list of all objects.
|
|
|
|
class Input_objects
|
|
{
|
|
public:
|
|
Input_objects()
|
|
: relobj_list_(), dynobj_list_(), sonames_(), system_library_directory_()
|
|
{ }
|
|
|
|
// The type of the list of input relocateable objects.
|
|
typedef std::vector<Relobj*> Relobj_list;
|
|
typedef Relobj_list::const_iterator Relobj_iterator;
|
|
|
|
// The type of the list of input dynamic objects.
|
|
typedef std::vector<Dynobj*> Dynobj_list;
|
|
typedef Dynobj_list::const_iterator Dynobj_iterator;
|
|
|
|
// Add an object to the list. Return true if all is well, or false
|
|
// if this object should be ignored.
|
|
bool
|
|
add_object(Object*);
|
|
|
|
// For each dynamic object, check whether we've seen all of its
|
|
// explicit dependencies.
|
|
void
|
|
check_dynamic_dependencies() const;
|
|
|
|
// Return whether an object was found in the system library
|
|
// directory.
|
|
bool
|
|
found_in_system_library_directory(const Object*) const;
|
|
|
|
// Iterate over all regular objects.
|
|
|
|
Relobj_iterator
|
|
relobj_begin() const
|
|
{ return this->relobj_list_.begin(); }
|
|
|
|
Relobj_iterator
|
|
relobj_end() const
|
|
{ return this->relobj_list_.end(); }
|
|
|
|
// Iterate over all dynamic objects.
|
|
|
|
Dynobj_iterator
|
|
dynobj_begin() const
|
|
{ return this->dynobj_list_.begin(); }
|
|
|
|
Dynobj_iterator
|
|
dynobj_end() const
|
|
{ return this->dynobj_list_.end(); }
|
|
|
|
// Return whether we have seen any dynamic objects.
|
|
bool
|
|
any_dynamic() const
|
|
{ return !this->dynobj_list_.empty(); }
|
|
|
|
// Return the number of input objects.
|
|
int
|
|
number_of_input_objects() const
|
|
{ return this->relobj_list_.size() + this->dynobj_list_.size(); }
|
|
|
|
private:
|
|
Input_objects(const Input_objects&);
|
|
Input_objects& operator=(const Input_objects&);
|
|
|
|
// The list of ordinary objects included in the link.
|
|
Relobj_list relobj_list_;
|
|
// The list of dynamic objects included in the link.
|
|
Dynobj_list dynobj_list_;
|
|
// SONAMEs that we have seen.
|
|
Unordered_set<std::string> sonames_;
|
|
// The directory in which we find the libc.so.
|
|
std::string system_library_directory_;
|
|
};
|
|
|
|
// Some of the information we pass to the relocation routines. We
|
|
// group this together to avoid passing a dozen different arguments.
|
|
|
|
template<int size, bool big_endian>
|
|
struct Relocate_info
|
|
{
|
|
// Command line options.
|
|
const General_options* options;
|
|
// Symbol table.
|
|
const Symbol_table* symtab;
|
|
// Layout.
|
|
const Layout* layout;
|
|
// Object being relocated.
|
|
Sized_relobj<size, big_endian>* object;
|
|
// Section index of relocation section.
|
|
unsigned int reloc_shndx;
|
|
// Section index of section being relocated.
|
|
unsigned int data_shndx;
|
|
|
|
// Return a string showing the location of a relocation. This is
|
|
// only used for error messages.
|
|
std::string
|
|
location(size_t relnum, off_t reloffset) const;
|
|
};
|
|
|
|
// Return an Object appropriate for the input file. P is BYTES long,
|
|
// and holds the ELF header.
|
|
|
|
extern Object*
|
|
make_elf_object(const std::string& name, Input_file*,
|
|
off_t offset, const unsigned char* p,
|
|
section_offset_type bytes);
|
|
|
|
} // end namespace gold
|
|
|
|
#endif // !defined(GOLD_OBJECT_H)
|