3032 lines
93 KiB
C++
3032 lines
93 KiB
C++
// object.h -- support for an object file for linking in gold -*- C++ -*-
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// Copyright (C) 2006-2017 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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#include "archive.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 Cref;
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class Layout;
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class Output_data;
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class Output_section;
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class Output_section_data;
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class Output_file;
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class Output_symtab_xindex;
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class Pluginobj;
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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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struct Symbols_data;
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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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Read_symbols_data()
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: section_headers(NULL), section_names(NULL), symbols(NULL),
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symbol_names(NULL), versym(NULL), verdef(NULL), verneed(NULL)
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{ }
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~Read_symbols_data();
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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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elfcpp::STT enclosing_symbol_type;
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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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Section_relocs()
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: contents(NULL)
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{ }
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~Section_relocs()
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{ delete this->contents; }
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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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Read_relocs_data()
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: local_symbols(NULL)
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{ }
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~Read_relocs_data()
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{ delete this->local_symbols; }
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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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// The Xindex class manages section indexes for objects with more than
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// 0xff00 sections.
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class Xindex
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{
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public:
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Xindex(int large_shndx_offset)
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: large_shndx_offset_(large_shndx_offset), symtab_xindex_()
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{ }
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// Initialize the symtab_xindex_ array, given the object and the
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// section index of the symbol table to use.
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template<int size, bool big_endian>
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void
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initialize_symtab_xindex(Object*, unsigned int symtab_shndx);
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// Read in the symtab_xindex_ array, given its section index.
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// PSHDRS may optionally point to the section headers.
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template<int size, bool big_endian>
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void
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read_symtab_xindex(Object*, unsigned int xindex_shndx,
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const unsigned char* pshdrs);
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// Symbol SYMNDX in OBJECT has a section of SHN_XINDEX; return the
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// real section index.
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unsigned int
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sym_xindex_to_shndx(Object* object, unsigned int symndx);
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private:
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// The type of the array giving the real section index for symbols
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// whose st_shndx field holds SHN_XINDEX.
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typedef std::vector<unsigned int> Symtab_xindex;
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// Adjust a section index if necessary. This should only be called
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// for ordinary section indexes.
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unsigned int
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adjust_shndx(unsigned int shndx)
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{
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if (shndx >= elfcpp::SHN_LORESERVE)
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shndx += this->large_shndx_offset_;
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return shndx;
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}
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// Adjust to apply to large section indexes.
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int large_shndx_offset_;
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// The data from the SHT_SYMTAB_SHNDX section.
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Symtab_xindex symtab_xindex_;
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};
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// A GOT offset list. A symbol may have more than one GOT offset
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// (e.g., when mixing modules compiled with two different TLS models),
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// but will usually have at most one. GOT_TYPE identifies the type of
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// GOT entry; its values are specific to each target.
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class Got_offset_list
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{
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public:
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Got_offset_list()
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: got_type_(-1U), got_offset_(0), got_next_(NULL)
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{ }
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Got_offset_list(unsigned int got_type, unsigned int got_offset)
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: got_type_(got_type), got_offset_(got_offset), got_next_(NULL)
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{ }
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~Got_offset_list()
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{
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if (this->got_next_ != NULL)
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{
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delete this->got_next_;
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this->got_next_ = NULL;
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}
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}
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// Initialize the fields to their default values.
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void
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init()
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{
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this->got_type_ = -1U;
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this->got_offset_ = 0;
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this->got_next_ = NULL;
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}
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// Set the offset for the GOT entry of type GOT_TYPE.
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void
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set_offset(unsigned int got_type, unsigned int got_offset)
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{
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if (this->got_type_ == -1U)
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{
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this->got_type_ = got_type;
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this->got_offset_ = got_offset;
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}
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else
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{
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for (Got_offset_list* g = this; g != NULL; g = g->got_next_)
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{
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if (g->got_type_ == got_type)
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{
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g->got_offset_ = got_offset;
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return;
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}
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}
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Got_offset_list* g = new Got_offset_list(got_type, got_offset);
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g->got_next_ = this->got_next_;
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this->got_next_ = g;
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}
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}
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// Return the offset for a GOT entry of type GOT_TYPE.
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unsigned int
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get_offset(unsigned int got_type) const
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{
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for (const Got_offset_list* g = this; g != NULL; g = g->got_next_)
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{
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if (g->got_type_ == got_type)
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return g->got_offset_;
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}
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return -1U;
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}
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// Return a pointer to the list, or NULL if the list is empty.
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const Got_offset_list*
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get_list() const
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{
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if (this->got_type_ == -1U)
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return NULL;
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return this;
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}
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// Abstract visitor class for iterating over GOT offsets.
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class Visitor
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{
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public:
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Visitor()
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{ }
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virtual
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~Visitor()
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{ }
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virtual void
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visit(unsigned int, unsigned int) = 0;
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};
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// Loop over all GOT offset entries, calling a visitor class V for each.
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void
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for_all_got_offsets(Visitor* v) const
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{
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if (this->got_type_ == -1U)
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return;
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for (const Got_offset_list* g = this; g != NULL; g = g->got_next_)
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v->visit(g->got_type_, g->got_offset_);
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}
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private:
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unsigned int got_type_;
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unsigned int got_offset_;
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Got_offset_list* got_next_;
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};
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// The Local_got_entry_key used to index the GOT offsets for local
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// non-TLS symbols, and tp-relative offsets for TLS symbols.
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class Local_got_entry_key
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{
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public:
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Local_got_entry_key(unsigned int symndx, uint64_t addend)
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: symndx_(symndx), addend_(addend)
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{}
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// Whether this equals to another Local_got_entry_key.
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bool
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eq(const Local_got_entry_key& key) const
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{
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return (this->symndx_ == key.symndx_ && this->addend_ == key.addend_);
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}
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// Compute a hash value for this using 64-bit FNV-1a hash.
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size_t
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hash_value() const
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{
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uint64_t h = 14695981039346656037ULL; // FNV offset basis.
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uint64_t prime = 1099511628211ULL;
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h = (h ^ static_cast<uint64_t>(this->symndx_)) * prime;
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h = (h ^ static_cast<uint64_t>(this->addend_)) * prime;
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return h;
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}
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// Functors for associative containers.
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struct equal_to
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{
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bool
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operator()(const Local_got_entry_key& key1,
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const Local_got_entry_key& key2) const
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{ return key1.eq(key2); }
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};
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struct hash
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{
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size_t
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operator()(const Local_got_entry_key& key) const
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{ return key.hash_value(); }
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};
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private:
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// The local symbol index.
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unsigned int symndx_;
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// The addend.
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uint64_t addend_;
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};
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// Type for mapping section index to uncompressed size and contents.
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struct Compressed_section_info
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{
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section_size_type size;
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elfcpp::Elf_Xword flag;
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const unsigned char* contents;
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};
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typedef std::map<unsigned int, Compressed_section_info> Compressed_section_map;
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template<int size, bool big_endian>
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Compressed_section_map*
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build_compressed_section_map(const unsigned char* pshdrs, unsigned int shnum,
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const char* names, section_size_type names_size,
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Object* obj, bool decompress_if_needed);
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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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typedef std::vector<Symbol*> Symbols;
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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), is_needed_(false), uses_split_stack_(false),
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has_no_split_stack_(false), no_export_(false),
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is_in_system_directory_(false), as_needed_(false), xindex_(NULL),
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compressed_sections_(NULL)
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{
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if (input_file != NULL)
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{
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input_file->file().add_object();
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this->is_in_system_directory_ = input_file->is_in_system_directory();
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this->as_needed_ = input_file->options().as_needed();
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}
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}
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virtual ~Object()
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{
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if (this->input_file_ != NULL)
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this->input_file_->file().remove_object();
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}
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// Return the name of the object as we would report it to the user.
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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 word size of the object file.
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virtual int elfsize() const = 0;
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// Return TRUE if this is a big-endian object file.
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virtual bool is_big_endian() const = 0;
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// Return whether this object is needed--true if it is a dynamic
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// object which defines some symbol referenced by a regular object.
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// We keep the flag here rather than in Dynobj for convenience when
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// setting it.
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bool
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is_needed() const
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{ return this->is_needed_; }
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// Record that this object is needed.
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void
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set_is_needed()
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{ this->is_needed_ = true; }
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// Return whether this object was compiled with -fsplit-stack.
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bool
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uses_split_stack() const
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{ return this->uses_split_stack_; }
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// Return whether this object contains any functions compiled with
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// the no_split_stack attribute.
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bool
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has_no_split_stack() const
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{ return this->has_no_split_stack_; }
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// Returns NULL for Objects that are not dynamic objects. This method
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// is overridden in the Dynobj class.
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Dynobj*
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dynobj()
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{ return this->do_dynobj(); }
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// Returns NULL for Objects that are not plugin objects. This method
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// is overridden in the Pluginobj class.
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Pluginobj*
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pluginobj()
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{ return this->do_pluginobj(); }
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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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{
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gold_assert(this->input_file_ != NULL);
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return this->input_file_;
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}
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const Input_file*
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input_file() const
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{
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gold_assert(this->input_file_ != NULL);
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return this->input_file_;
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}
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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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{
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if (this->input_file_ != NULL)
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this->input_file_->file().lock(t);
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}
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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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{
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if (this->input_file_ != NULL)
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this->input_file()->file().unlock(t);
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}
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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_ != NULL && 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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{
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if (this->input_file_ == NULL)
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return NULL;
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return this->input_file()->file().token();
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}
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// Release the underlying file.
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void
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release()
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{
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if (this->input_file_ != NULL)
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this->input_file()->file().release();
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}
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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 whether this is an incremental object.
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bool
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is_incremental() const
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{ return this->do_is_incremental(); }
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// Return the last modified time of the file.
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Timespec
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get_mtime()
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{ return this->do_get_mtime(); }
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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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// Adjust a symbol's section index as needed. SYMNDX is the index
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// of the symbol and SHNDX is the symbol's section from
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// get_st_shndx. This returns the section index. It sets
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// *IS_ORDINARY to indicate whether this is a normal section index,
|
|
// rather than a special code between SHN_LORESERVE and
|
|
// SHN_HIRESERVE.
|
|
unsigned int
|
|
adjust_sym_shndx(unsigned int symndx, unsigned int shndx, bool* is_ordinary)
|
|
{
|
|
if (shndx < elfcpp::SHN_LORESERVE)
|
|
*is_ordinary = true;
|
|
else if (shndx == elfcpp::SHN_XINDEX)
|
|
{
|
|
if (this->xindex_ == NULL)
|
|
this->xindex_ = this->do_initialize_xindex();
|
|
shndx = this->xindex_->sym_xindex_to_shndx(this, symndx);
|
|
*is_ordinary = true;
|
|
}
|
|
else
|
|
*is_ordinary = false;
|
|
return shndx;
|
|
}
|
|
|
|
// Return the size of a section given a section index.
|
|
uint64_t
|
|
section_size(unsigned int shndx)
|
|
{ return this->do_section_size(shndx); }
|
|
|
|
// Return the name of a section given a section index.
|
|
std::string
|
|
section_name(unsigned int shndx) const
|
|
{ return this->do_section_name(shndx); }
|
|
|
|
// Return the section flags given a section index.
|
|
uint64_t
|
|
section_flags(unsigned int shndx)
|
|
{ return this->do_section_flags(shndx); }
|
|
|
|
// Return the section entsize given a section index.
|
|
uint64_t
|
|
section_entsize(unsigned int shndx)
|
|
{ return this->do_section_entsize(shndx); }
|
|
|
|
// Return the section address given a section index.
|
|
uint64_t
|
|
section_address(unsigned int shndx)
|
|
{ return this->do_section_address(shndx); }
|
|
|
|
// Return the section type given a section index.
|
|
unsigned int
|
|
section_type(unsigned int shndx)
|
|
{ return this->do_section_type(shndx); }
|
|
|
|
// Return the section link field given a section index.
|
|
unsigned int
|
|
section_link(unsigned int shndx)
|
|
{ return this->do_section_link(shndx); }
|
|
|
|
// Return the section info field given a section index.
|
|
unsigned int
|
|
section_info(unsigned int shndx)
|
|
{ return this->do_section_info(shndx); }
|
|
|
|
// Return the required section alignment given a section index.
|
|
uint64_t
|
|
section_addralign(unsigned int shndx)
|
|
{ return this->do_section_addralign(shndx); }
|
|
|
|
// Return the output section given a section index.
|
|
Output_section*
|
|
output_section(unsigned int shndx) const
|
|
{ return this->do_output_section(shndx); }
|
|
|
|
// Given a section index, return its address.
|
|
// The return value will be -1U if the section is specially mapped,
|
|
// such as a merge section.
|
|
uint64_t
|
|
output_section_address(unsigned int shndx)
|
|
{ return this->do_output_section_address(shndx); }
|
|
|
|
// Given a section index, return the offset in the Output_section.
|
|
// The return value will be -1U if the section is specially mapped,
|
|
// such as a merge section.
|
|
uint64_t
|
|
output_section_offset(unsigned int shndx) const
|
|
{ return this->do_output_section_offset(shndx); }
|
|
|
|
// Read the symbol information.
|
|
void
|
|
read_symbols(Read_symbols_data* sd)
|
|
{ return this->do_read_symbols(sd); }
|
|
|
|
// Pass sections which should be included in the link to the Layout
|
|
// object, and record where the sections go in the output file.
|
|
void
|
|
layout(Symbol_table* symtab, Layout* layout, Read_symbols_data* sd)
|
|
{ this->do_layout(symtab, layout, sd); }
|
|
|
|
// Add symbol information to the global symbol table.
|
|
void
|
|
add_symbols(Symbol_table* symtab, Read_symbols_data* sd, Layout *layout)
|
|
{ this->do_add_symbols(symtab, sd, layout); }
|
|
|
|
// Add symbol information to the global symbol table.
|
|
Archive::Should_include
|
|
should_include_member(Symbol_table* symtab, Layout* layout,
|
|
Read_symbols_data* sd, std::string* why)
|
|
{ return this->do_should_include_member(symtab, layout, sd, why); }
|
|
|
|
// Iterate over global symbols, calling a visitor class V for each.
|
|
void
|
|
for_all_global_symbols(Read_symbols_data* sd,
|
|
Library_base::Symbol_visitor_base* v)
|
|
{ return this->do_for_all_global_symbols(sd, v); }
|
|
|
|
// Iterate over local symbols, calling a visitor class V for each GOT offset
|
|
// associated with a local symbol.
|
|
void
|
|
for_all_local_got_entries(Got_offset_list::Visitor* v) const
|
|
{ this->do_for_all_local_got_entries(v); }
|
|
|
|
// Functions and types for the elfcpp::Elf_file interface. This
|
|
// permit us to use Object as the File template parameter for
|
|
// elfcpp::Elf_file.
|
|
|
|
// The View class is returned by view. It must support a single
|
|
// method, data(). This is trivial, because get_view does what we
|
|
// need.
|
|
class View
|
|
{
|
|
public:
|
|
View(const unsigned char* p)
|
|
: p_(p)
|
|
{ }
|
|
|
|
const unsigned char*
|
|
data() const
|
|
{ return this->p_; }
|
|
|
|
private:
|
|
const unsigned char* p_;
|
|
};
|
|
|
|
// Return a View.
|
|
View
|
|
view(off_t file_offset, section_size_type data_size)
|
|
{ return View(this->get_view(file_offset, data_size, true, true)); }
|
|
|
|
// Report an error.
|
|
void
|
|
error(const char* format, ...) const ATTRIBUTE_PRINTF_2;
|
|
|
|
// A location in the file.
|
|
struct Location
|
|
{
|
|
off_t file_offset;
|
|
off_t data_size;
|
|
|
|
Location(off_t fo, section_size_type ds)
|
|
: file_offset(fo), data_size(ds)
|
|
{ }
|
|
};
|
|
|
|
// Get a View given a Location.
|
|
View view(Location loc)
|
|
{ return View(this->get_view(loc.file_offset, loc.data_size, true, true)); }
|
|
|
|
// Get a view into the underlying file.
|
|
const unsigned char*
|
|
get_view(off_t start, section_size_type size, bool aligned, bool cache)
|
|
{
|
|
return this->input_file()->file().get_view(this->offset_, start, size,
|
|
aligned, cache);
|
|
}
|
|
|
|
// Get a lasting view into the underlying file.
|
|
File_view*
|
|
get_lasting_view(off_t start, section_size_type size, bool aligned,
|
|
bool cache)
|
|
{
|
|
return this->input_file()->file().get_lasting_view(this->offset_, start,
|
|
size, aligned, cache);
|
|
}
|
|
|
|
// Read data from the underlying file.
|
|
void
|
|
read(off_t start, section_size_type size, void* p)
|
|
{ this->input_file()->file().read(start + this->offset_, size, p); }
|
|
|
|
// Read multiple data from the underlying file.
|
|
void
|
|
read_multiple(const File_read::Read_multiple& rm)
|
|
{ this->input_file()->file().read_multiple(this->offset_, rm); }
|
|
|
|
// Stop caching views in the underlying file.
|
|
void
|
|
clear_view_cache_marks()
|
|
{
|
|
if (this->input_file_ != NULL)
|
|
this->input_file_->file().clear_view_cache_marks();
|
|
}
|
|
|
|
// Get the number of global symbols defined by this object, and the
|
|
// number of the symbols whose final definition came from this
|
|
// object.
|
|
void
|
|
get_global_symbol_counts(const Symbol_table* symtab, size_t* defined,
|
|
size_t* used) const
|
|
{ this->do_get_global_symbol_counts(symtab, defined, used); }
|
|
|
|
// Get the symbols defined in this object.
|
|
const Symbols*
|
|
get_global_symbols() const
|
|
{ return this->do_get_global_symbols(); }
|
|
|
|
// Set flag that this object was found in a system directory.
|
|
void
|
|
set_is_in_system_directory()
|
|
{ this->is_in_system_directory_ = true; }
|
|
|
|
// Return whether this object was found in a system directory.
|
|
bool
|
|
is_in_system_directory() const
|
|
{ return this->is_in_system_directory_; }
|
|
|
|
// Set flag that this object was linked with --as-needed.
|
|
void
|
|
set_as_needed()
|
|
{ this->as_needed_ = true; }
|
|
|
|
// Clear flag that this object was linked with --as-needed.
|
|
void
|
|
clear_as_needed()
|
|
{ this->as_needed_ = false; }
|
|
|
|
// Return whether this object was linked with --as-needed.
|
|
bool
|
|
as_needed() const
|
|
{ return this->as_needed_; }
|
|
|
|
// Return whether we found this object by searching a directory.
|
|
bool
|
|
searched_for() const
|
|
{ return this->input_file()->will_search_for(); }
|
|
|
|
bool
|
|
no_export() const
|
|
{ return this->no_export_; }
|
|
|
|
void
|
|
set_no_export(bool value)
|
|
{ this->no_export_ = value; }
|
|
|
|
bool
|
|
section_is_compressed(unsigned int shndx,
|
|
section_size_type* uncompressed_size) const
|
|
{
|
|
if (this->compressed_sections_ == NULL)
|
|
return false;
|
|
Compressed_section_map::const_iterator p =
|
|
this->compressed_sections_->find(shndx);
|
|
if (p != this->compressed_sections_->end())
|
|
{
|
|
if (uncompressed_size != NULL)
|
|
*uncompressed_size = p->second.size;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// Return a view of the decompressed contents of a section. Set *PLEN
|
|
// to the size. Set *IS_NEW to true if the contents need to be freed
|
|
// by the caller.
|
|
const unsigned char*
|
|
decompressed_section_contents(unsigned int shndx, section_size_type* plen,
|
|
bool* is_cached);
|
|
|
|
// Discard any buffers of decompressed sections. This is done
|
|
// at the end of the Add_symbols task.
|
|
void
|
|
discard_decompressed_sections();
|
|
|
|
// Return the index of the first incremental relocation for symbol SYMNDX.
|
|
unsigned int
|
|
get_incremental_reloc_base(unsigned int symndx) const
|
|
{ return this->do_get_incremental_reloc_base(symndx); }
|
|
|
|
// Return the number of incremental relocations for symbol SYMNDX.
|
|
unsigned int
|
|
get_incremental_reloc_count(unsigned int symndx) const
|
|
{ return this->do_get_incremental_reloc_count(symndx); }
|
|
|
|
// Return the output view for section SHNDX.
|
|
unsigned char*
|
|
get_output_view(unsigned int shndx, section_size_type* plen) const
|
|
{ return this->do_get_output_view(shndx, plen); }
|
|
|
|
protected:
|
|
// Returns NULL for Objects that are not dynamic objects. This method
|
|
// is overridden in the Dynobj class.
|
|
virtual Dynobj*
|
|
do_dynobj()
|
|
{ return NULL; }
|
|
|
|
// Returns NULL for Objects that are not plugin objects. This method
|
|
// is overridden in the Pluginobj class.
|
|
virtual Pluginobj*
|
|
do_pluginobj()
|
|
{ return NULL; }
|
|
|
|
// Return TRUE if this is an incremental (unchanged) input file.
|
|
// We return FALSE by default; the incremental object classes
|
|
// override this method.
|
|
virtual bool
|
|
do_is_incremental() const
|
|
{ return false; }
|
|
|
|
// Return the last modified time of the file. This method may be
|
|
// overridden for subclasses that don't use an actual file (e.g.,
|
|
// Incremental objects).
|
|
virtual Timespec
|
|
do_get_mtime()
|
|
{ return this->input_file()->file().get_mtime(); }
|
|
|
|
// Read the symbols--implemented by child class.
|
|
virtual void
|
|
do_read_symbols(Read_symbols_data*) = 0;
|
|
|
|
// Lay out sections--implemented by child class.
|
|
virtual void
|
|
do_layout(Symbol_table*, Layout*, Read_symbols_data*) = 0;
|
|
|
|
// Add symbol information to the global symbol table--implemented by
|
|
// child class.
|
|
virtual void
|
|
do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*) = 0;
|
|
|
|
virtual Archive::Should_include
|
|
do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*,
|
|
std::string* why) = 0;
|
|
|
|
// Iterate over global symbols, calling a visitor class V for each.
|
|
virtual void
|
|
do_for_all_global_symbols(Read_symbols_data* sd,
|
|
Library_base::Symbol_visitor_base* v) = 0;
|
|
|
|
// Iterate over local symbols, calling a visitor class V for each GOT offset
|
|
// associated with a local symbol.
|
|
virtual void
|
|
do_for_all_local_got_entries(Got_offset_list::Visitor* v) const = 0;
|
|
|
|
// Return the location of the contents of a section. Implemented by
|
|
// child class.
|
|
virtual const unsigned char*
|
|
do_section_contents(unsigned int shndx, section_size_type* plen,
|
|
bool cache) = 0;
|
|
|
|
// Get the size of a section--implemented by child class.
|
|
virtual uint64_t
|
|
do_section_size(unsigned int shndx) = 0;
|
|
|
|
// Get the name of a section--implemented by child class.
|
|
virtual std::string
|
|
do_section_name(unsigned int shndx) const = 0;
|
|
|
|
// Get section flags--implemented by child class.
|
|
virtual uint64_t
|
|
do_section_flags(unsigned int shndx) = 0;
|
|
|
|
// Get section entsize--implemented by child class.
|
|
virtual uint64_t
|
|
do_section_entsize(unsigned int shndx) = 0;
|
|
|
|
// Get section address--implemented by child class.
|
|
virtual uint64_t
|
|
do_section_address(unsigned int shndx) = 0;
|
|
|
|
// Get section type--implemented by child class.
|
|
virtual unsigned int
|
|
do_section_type(unsigned int shndx) = 0;
|
|
|
|
// Get section link field--implemented by child class.
|
|
virtual unsigned int
|
|
do_section_link(unsigned int shndx) = 0;
|
|
|
|
// Get section info field--implemented by child class.
|
|
virtual unsigned int
|
|
do_section_info(unsigned int shndx) = 0;
|
|
|
|
// Get section alignment--implemented by child class.
|
|
virtual uint64_t
|
|
do_section_addralign(unsigned int shndx) = 0;
|
|
|
|
// Return the output section given a section index--implemented
|
|
// by child class.
|
|
virtual Output_section*
|
|
do_output_section(unsigned int) const
|
|
{ gold_unreachable(); }
|
|
|
|
// Get the address of a section--implemented by child class.
|
|
virtual uint64_t
|
|
do_output_section_address(unsigned int)
|
|
{ gold_unreachable(); }
|
|
|
|
// Get the offset of a section--implemented by child class.
|
|
virtual uint64_t
|
|
do_output_section_offset(unsigned int) const
|
|
{ gold_unreachable(); }
|
|
|
|
// Return the Xindex structure to use.
|
|
virtual Xindex*
|
|
do_initialize_xindex() = 0;
|
|
|
|
// Implement get_global_symbol_counts--implemented by child class.
|
|
virtual void
|
|
do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const = 0;
|
|
|
|
virtual const Symbols*
|
|
do_get_global_symbols() const = 0;
|
|
|
|
// Set the number of sections.
|
|
void
|
|
set_shnum(int shnum)
|
|
{ this->shnum_ = shnum; }
|
|
|
|
// Functions used by both Sized_relobj_file and Sized_dynobj.
|
|
|
|
// Read the section data into a Read_symbols_data object.
|
|
template<int size, bool big_endian>
|
|
void
|
|
read_section_data(elfcpp::Elf_file<size, big_endian, Object>*,
|
|
Read_symbols_data*);
|
|
|
|
// Find the section header with the given NAME. If HDR is non-NULL
|
|
// then it is a section header returned from a previous call to this
|
|
// function and the next section header with the same name will be
|
|
// returned.
|
|
template<int size, bool big_endian>
|
|
const unsigned char*
|
|
find_shdr(const unsigned char* pshdrs, const char* name,
|
|
const char* names, section_size_type names_size,
|
|
const unsigned char* hdr) const;
|
|
|
|
// Let the child class initialize the xindex object directly.
|
|
void
|
|
set_xindex(Xindex* xindex)
|
|
{
|
|
gold_assert(this->xindex_ == NULL);
|
|
this->xindex_ = xindex;
|
|
}
|
|
|
|
// If NAME is the name of a special .gnu.warning section, arrange
|
|
// for the warning to be issued. SHNDX is the section index.
|
|
// Return whether it is a warning section.
|
|
bool
|
|
handle_gnu_warning_section(const char* name, unsigned int shndx,
|
|
Symbol_table*);
|
|
|
|
// If NAME is the name of the special section which indicates that
|
|
// this object was compiled with -fsplit-stack, mark it accordingly,
|
|
// and return true. Otherwise return false.
|
|
bool
|
|
handle_split_stack_section(const char* name);
|
|
|
|
// Discard any buffers of decompressed sections. This is done
|
|
// at the end of the Add_symbols task.
|
|
virtual void
|
|
do_discard_decompressed_sections()
|
|
{ }
|
|
|
|
// Return the index of the first incremental relocation for symbol SYMNDX--
|
|
// implemented by child class.
|
|
virtual unsigned int
|
|
do_get_incremental_reloc_base(unsigned int) const
|
|
{ gold_unreachable(); }
|
|
|
|
// Return the number of incremental relocations for symbol SYMNDX--
|
|
// implemented by child class.
|
|
virtual unsigned int
|
|
do_get_incremental_reloc_count(unsigned int) const
|
|
{ gold_unreachable(); }
|
|
|
|
// Return the output view for a section.
|
|
virtual unsigned char*
|
|
do_get_output_view(unsigned int, section_size_type*) const
|
|
{ gold_unreachable(); }
|
|
|
|
void
|
|
set_compressed_sections(Compressed_section_map* compressed_sections)
|
|
{ this->compressed_sections_ = compressed_sections; }
|
|
|
|
Compressed_section_map*
|
|
compressed_sections()
|
|
{ return this->compressed_sections_; }
|
|
|
|
private:
|
|
// This class may not be copied.
|
|
Object(const Object&);
|
|
Object& operator=(const Object&);
|
|
|
|
// Name of object as printed to user.
|
|
std::string name_;
|
|
// For reading the file.
|
|
Input_file* input_file_;
|
|
// Offset within the file--0 for an object file, non-0 for an
|
|
// archive.
|
|
off_t offset_;
|
|
// Number of input sections.
|
|
unsigned int shnum_;
|
|
// Whether this is a dynamic object.
|
|
bool is_dynamic_ : 1;
|
|
// Whether this object is needed. This is only set for dynamic
|
|
// objects, and means that the object defined a symbol which was
|
|
// used by a reference from a regular object.
|
|
bool is_needed_ : 1;
|
|
// Whether this object was compiled with -fsplit-stack.
|
|
bool uses_split_stack_ : 1;
|
|
// Whether this object contains any functions compiled with the
|
|
// no_split_stack attribute.
|
|
bool has_no_split_stack_ : 1;
|
|
// True if exclude this object from automatic symbol export.
|
|
// This is used only for archive objects.
|
|
bool no_export_ : 1;
|
|
// True if the object was found in a system directory.
|
|
bool is_in_system_directory_ : 1;
|
|
// True if the object was linked with --as-needed.
|
|
bool as_needed_ : 1;
|
|
// Many sections for objects with more than SHN_LORESERVE sections.
|
|
Xindex* xindex_;
|
|
// For compressed debug sections, map section index to uncompressed size
|
|
// and contents.
|
|
Compressed_section_map* compressed_sections_;
|
|
};
|
|
|
|
// A regular object (ET_REL). This is an abstract base class itself.
|
|
// The implementation is the template class Sized_relobj_file.
|
|
|
|
class Relobj : public Object
|
|
{
|
|
public:
|
|
Relobj(const std::string& name, Input_file* input_file, off_t offset = 0)
|
|
: Object(name, input_file, false, offset),
|
|
output_sections_(),
|
|
map_to_relocatable_relocs_(NULL),
|
|
object_merge_map_(NULL),
|
|
relocs_must_follow_section_writes_(false),
|
|
sd_(NULL),
|
|
reloc_counts_(NULL),
|
|
reloc_bases_(NULL),
|
|
first_dyn_reloc_(0),
|
|
dyn_reloc_count_(0)
|
|
{ }
|
|
|
|
// During garbage collection, the Read_symbols_data pass for
|
|
// each object is stored as layout needs to be done after
|
|
// reloc processing.
|
|
Symbols_data*
|
|
get_symbols_data()
|
|
{ return this->sd_; }
|
|
|
|
// Decides which section names have to be included in the worklist
|
|
// as roots.
|
|
bool
|
|
is_section_name_included(const char* name);
|
|
|
|
void
|
|
copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd,
|
|
unsigned int section_header_size);
|
|
|
|
void
|
|
set_symbols_data(Symbols_data* sd)
|
|
{ this->sd_ = sd; }
|
|
|
|
// During garbage collection, the Read_relocs pass for all objects
|
|
// is done before scanning the relocs. In that case, this->rd_ is
|
|
// used to store the information from Read_relocs for each object.
|
|
// This data is also used to compute the list of relevant sections.
|
|
Read_relocs_data*
|
|
get_relocs_data()
|
|
{ return this->rd_; }
|
|
|
|
void
|
|
set_relocs_data(Read_relocs_data* rd)
|
|
{ this->rd_ = rd; }
|
|
|
|
virtual bool
|
|
is_output_section_offset_invalid(unsigned int shndx) const = 0;
|
|
|
|
// Read the relocs.
|
|
void
|
|
read_relocs(Read_relocs_data* rd)
|
|
{ return this->do_read_relocs(rd); }
|
|
|
|
// Process the relocs, during garbage collection only.
|
|
void
|
|
gc_process_relocs(Symbol_table* symtab, Layout* layout, Read_relocs_data* rd)
|
|
{ return this->do_gc_process_relocs(symtab, layout, rd); }
|
|
|
|
// Scan the relocs and adjust the symbol table.
|
|
void
|
|
scan_relocs(Symbol_table* symtab, Layout* layout, Read_relocs_data* rd)
|
|
{ return this->do_scan_relocs(symtab, layout, rd); }
|
|
|
|
// Return the value of the local symbol whose index is SYMNDX, plus
|
|
// ADDEND. ADDEND is passed in so that we can correctly handle the
|
|
// section symbol for a merge section.
|
|
uint64_t
|
|
local_symbol_value(unsigned int symndx, uint64_t addend) const
|
|
{ return this->do_local_symbol_value(symndx, addend); }
|
|
|
|
// Return the PLT offset for a local symbol. It is an error to call
|
|
// this if it doesn't have one.
|
|
unsigned int
|
|
local_plt_offset(unsigned int symndx) const
|
|
{ return this->do_local_plt_offset(symndx); }
|
|
|
|
// Return whether the local symbol SYMNDX has a GOT offset of type
|
|
// GOT_TYPE.
|
|
bool
|
|
local_has_got_offset(unsigned int symndx, unsigned int got_type) const
|
|
{ return this->do_local_has_got_offset(symndx, got_type, 0); }
|
|
|
|
// Return whether the local symbol SYMNDX plus ADDEND has a GOT offset
|
|
// of type GOT_TYPE.
|
|
bool
|
|
local_has_got_offset(unsigned int symndx, unsigned int got_type,
|
|
uint64_t addend) const
|
|
{ return this->do_local_has_got_offset(symndx, got_type, addend); }
|
|
|
|
// Return the GOT offset of type GOT_TYPE of the local symbol
|
|
// SYMNDX. It is an error to call this if the symbol does not have
|
|
// a GOT offset of the specified type.
|
|
unsigned int
|
|
local_got_offset(unsigned int symndx, unsigned int got_type) const
|
|
{ return this->do_local_got_offset(symndx, got_type, 0); }
|
|
|
|
// Return the GOT offset of type GOT_TYPE of the local symbol
|
|
// SYMNDX plus ADDEND. It is an error to call this if the symbol
|
|
// does not have a GOT offset of the specified type.
|
|
unsigned int
|
|
local_got_offset(unsigned int symndx, unsigned int got_type,
|
|
uint64_t addend) const
|
|
{ return this->do_local_got_offset(symndx, got_type, addend); }
|
|
|
|
// Set the GOT offset with type GOT_TYPE of the local symbol SYMNDX
|
|
// to GOT_OFFSET.
|
|
void
|
|
set_local_got_offset(unsigned int symndx, unsigned int got_type,
|
|
unsigned int got_offset)
|
|
{ this->do_set_local_got_offset(symndx, got_type, got_offset, 0); }
|
|
|
|
// Set the GOT offset with type GOT_TYPE of the local symbol SYMNDX
|
|
// plus ADDEND to GOT_OFFSET.
|
|
void
|
|
set_local_got_offset(unsigned int symndx, unsigned int got_type,
|
|
unsigned int got_offset, uint64_t addend)
|
|
{ this->do_set_local_got_offset(symndx, got_type, got_offset, addend); }
|
|
|
|
// Return whether the local symbol SYMNDX is a TLS symbol.
|
|
bool
|
|
local_is_tls(unsigned int symndx) const
|
|
{ return this->do_local_is_tls(symndx); }
|
|
|
|
// The number of local symbols in the input symbol table.
|
|
virtual unsigned int
|
|
local_symbol_count() const
|
|
{ return this->do_local_symbol_count(); }
|
|
|
|
// The number of local symbols in the output symbol table.
|
|
virtual unsigned int
|
|
output_local_symbol_count() const
|
|
{ return this->do_output_local_symbol_count(); }
|
|
|
|
// The file offset for local symbols in the output symbol table.
|
|
virtual off_t
|
|
local_symbol_offset() const
|
|
{ return this->do_local_symbol_offset(); }
|
|
|
|
// Initial local symbol processing: count the number of local symbols
|
|
// in the output symbol table and dynamic symbol table; add local symbol
|
|
// names to *POOL and *DYNPOOL.
|
|
void
|
|
count_local_symbols(Stringpool_template<char>* pool,
|
|
Stringpool_template<char>* dynpool)
|
|
{ return this->do_count_local_symbols(pool, dynpool); }
|
|
|
|
// Set the values of the local symbols, set the output symbol table
|
|
// indexes for the local variables, and set the offset where local
|
|
// symbol information will be stored. Returns the new local symbol index.
|
|
unsigned int
|
|
finalize_local_symbols(unsigned int index, off_t off, Symbol_table* symtab)
|
|
{ return this->do_finalize_local_symbols(index, off, symtab); }
|
|
|
|
// Set the output dynamic symbol table indexes for the local variables.
|
|
unsigned int
|
|
set_local_dynsym_indexes(unsigned int index)
|
|
{ return this->do_set_local_dynsym_indexes(index); }
|
|
|
|
// Set the offset where local dynamic symbol information will be stored.
|
|
unsigned int
|
|
set_local_dynsym_offset(off_t off)
|
|
{ return this->do_set_local_dynsym_offset(off); }
|
|
|
|
// Record a dynamic relocation against an input section from this object.
|
|
void
|
|
add_dyn_reloc(unsigned int index)
|
|
{
|
|
if (this->dyn_reloc_count_ == 0)
|
|
this->first_dyn_reloc_ = index;
|
|
++this->dyn_reloc_count_;
|
|
}
|
|
|
|
// Return the index of the first dynamic relocation.
|
|
unsigned int
|
|
first_dyn_reloc() const
|
|
{ return this->first_dyn_reloc_; }
|
|
|
|
// Return the count of dynamic relocations.
|
|
unsigned int
|
|
dyn_reloc_count() const
|
|
{ return this->dyn_reloc_count_; }
|
|
|
|
// Relocate the input sections and write out the local symbols.
|
|
void
|
|
relocate(const Symbol_table* symtab, const Layout* layout, Output_file* of)
|
|
{ return this->do_relocate(symtab, layout, of); }
|
|
|
|
// Return whether an input section is being included in the link.
|
|
bool
|
|
is_section_included(unsigned int shndx) const
|
|
{
|
|
gold_assert(shndx < this->output_sections_.size());
|
|
return this->output_sections_[shndx] != NULL;
|
|
}
|
|
|
|
// The output section of the input section with index SHNDX.
|
|
// This is only used currently to remove a section from the link in
|
|
// relaxation.
|
|
void
|
|
set_output_section(unsigned int shndx, Output_section* os)
|
|
{
|
|
gold_assert(shndx < this->output_sections_.size());
|
|
this->output_sections_[shndx] = os;
|
|
}
|
|
|
|
// Set the offset of an input section within its output section.
|
|
void
|
|
set_section_offset(unsigned int shndx, uint64_t off)
|
|
{ this->do_set_section_offset(shndx, 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_; }
|
|
|
|
Object_merge_map*
|
|
get_or_create_merge_map();
|
|
|
|
template<int size>
|
|
void
|
|
initialize_input_to_output_map(unsigned int shndx,
|
|
typename elfcpp::Elf_types<size>::Elf_Addr starting_address,
|
|
Unordered_map<section_offset_type,
|
|
typename elfcpp::Elf_types<size>::Elf_Addr>* output_address) const;
|
|
|
|
void
|
|
add_merge_mapping(Output_section_data *output_data,
|
|
unsigned int shndx, section_offset_type offset,
|
|
section_size_type length,
|
|
section_offset_type output_offset);
|
|
|
|
bool
|
|
merge_output_offset(unsigned int shndx, section_offset_type offset,
|
|
section_offset_type *poutput) const;
|
|
|
|
const Output_section_data*
|
|
find_merge_section(unsigned int shndx) const;
|
|
|
|
// 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];
|
|
}
|
|
|
|
// Layout sections whose layout was deferred while waiting for
|
|
// input files from a plugin.
|
|
void
|
|
layout_deferred_sections(Layout* layout)
|
|
{ this->do_layout_deferred_sections(layout); }
|
|
|
|
// Return the index of the first incremental relocation for symbol SYMNDX.
|
|
virtual unsigned int
|
|
do_get_incremental_reloc_base(unsigned int symndx) const
|
|
{ return this->reloc_bases_[symndx]; }
|
|
|
|
// Return the number of incremental relocations for symbol SYMNDX.
|
|
virtual unsigned int
|
|
do_get_incremental_reloc_count(unsigned int symndx) const
|
|
{ return this->reloc_counts_[symndx]; }
|
|
|
|
// Return the word size of the object file.
|
|
int
|
|
elfsize() const
|
|
{ return this->do_elfsize(); }
|
|
|
|
// Return TRUE if this is a big-endian object file.
|
|
bool
|
|
is_big_endian() const
|
|
{ return this->do_is_big_endian(); }
|
|
|
|
protected:
|
|
// The output section to be used for each input section, indexed by
|
|
// the input section number. The output section is NULL if the
|
|
// input section is to be discarded.
|
|
typedef std::vector<Output_section*> Output_sections;
|
|
|
|
// Read the relocs--implemented by child class.
|
|
virtual void
|
|
do_read_relocs(Read_relocs_data*) = 0;
|
|
|
|
// Process the relocs--implemented by child class.
|
|
virtual void
|
|
do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*) = 0;
|
|
|
|
// Scan the relocs--implemented by child class.
|
|
virtual void
|
|
do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*) = 0;
|
|
|
|
// Return the value of a local symbol.
|
|
virtual uint64_t
|
|
do_local_symbol_value(unsigned int symndx, uint64_t addend) const = 0;
|
|
|
|
// Return the PLT offset of a local symbol.
|
|
virtual unsigned int
|
|
do_local_plt_offset(unsigned int symndx) const = 0;
|
|
|
|
// Return whether a local symbol plus addend has a GOT offset
|
|
// of a given type.
|
|
virtual bool
|
|
do_local_has_got_offset(unsigned int symndx,
|
|
unsigned int got_type, uint64_t addend) const = 0;
|
|
|
|
// Return the GOT offset of a given type of a local symbol plus addend.
|
|
virtual unsigned int
|
|
do_local_got_offset(unsigned int symndx, unsigned int got_type,
|
|
uint64_t addend) const = 0;
|
|
|
|
// Set the GOT offset with a given type for a local symbol plus addend.
|
|
virtual void
|
|
do_set_local_got_offset(unsigned int symndx, unsigned int got_type,
|
|
unsigned int got_offset, uint64_t addend) = 0;
|
|
|
|
// Return whether local symbol SYMNDX is a TLS symbol.
|
|
virtual bool
|
|
do_local_is_tls(unsigned int symndx) const = 0;
|
|
|
|
// Return the number of local symbols--implemented by child class.
|
|
virtual unsigned int
|
|
do_local_symbol_count() const = 0;
|
|
|
|
// Return the number of output local symbols--implemented by child class.
|
|
virtual unsigned int
|
|
do_output_local_symbol_count() const = 0;
|
|
|
|
// Return the file offset for local symbols--implemented by child class.
|
|
virtual off_t
|
|
do_local_symbol_offset() 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, Symbol_table*) = 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 Symbol_table* symtab, const Layout*, Output_file* of) = 0;
|
|
|
|
// Set the offset of a section--implemented by child class.
|
|
virtual void
|
|
do_set_section_offset(unsigned int shndx, uint64_t off) = 0;
|
|
|
|
// Layout sections whose layout was deferred while waiting for
|
|
// input files from a plugin--implemented by child class.
|
|
virtual void
|
|
do_layout_deferred_sections(Layout*) = 0;
|
|
|
|
// Given a section index, return the corresponding Output_section.
|
|
// The return value will be NULL if the section is not included in
|
|
// the link.
|
|
Output_section*
|
|
do_output_section(unsigned int shndx) const
|
|
{
|
|
gold_assert(shndx < this->output_sections_.size());
|
|
return this->output_sections_[shndx];
|
|
}
|
|
|
|
// Return the vector mapping input sections to output sections.
|
|
Output_sections&
|
|
output_sections()
|
|
{ return this->output_sections_; }
|
|
|
|
const Output_sections&
|
|
output_sections() const
|
|
{ return this->output_sections_; }
|
|
|
|
// 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; }
|
|
|
|
// Allocate the array for counting incremental relocations.
|
|
void
|
|
allocate_incremental_reloc_counts()
|
|
{
|
|
unsigned int nsyms = this->do_get_global_symbols()->size();
|
|
this->reloc_counts_ = new unsigned int[nsyms];
|
|
gold_assert(this->reloc_counts_ != NULL);
|
|
memset(this->reloc_counts_, 0, nsyms * sizeof(unsigned int));
|
|
}
|
|
|
|
// Record a relocation in this object referencing global symbol SYMNDX.
|
|
// Used for tracking incremental link information.
|
|
void
|
|
count_incremental_reloc(unsigned int symndx)
|
|
{
|
|
unsigned int nsyms = this->do_get_global_symbols()->size();
|
|
gold_assert(symndx < nsyms);
|
|
gold_assert(this->reloc_counts_ != NULL);
|
|
++this->reloc_counts_[symndx];
|
|
}
|
|
|
|
// Finalize the incremental relocation information.
|
|
void
|
|
finalize_incremental_relocs(Layout* layout, bool clear_counts);
|
|
|
|
// Return the index of the next relocation to be written for global symbol
|
|
// SYMNDX. Only valid after finalize_incremental_relocs() has been called.
|
|
unsigned int
|
|
next_incremental_reloc_index(unsigned int symndx)
|
|
{
|
|
unsigned int nsyms = this->do_get_global_symbols()->size();
|
|
|
|
gold_assert(this->reloc_counts_ != NULL);
|
|
gold_assert(this->reloc_bases_ != NULL);
|
|
gold_assert(symndx < nsyms);
|
|
|
|
unsigned int counter = this->reloc_counts_[symndx]++;
|
|
return this->reloc_bases_[symndx] + counter;
|
|
}
|
|
|
|
// Return the word size of the object file--
|
|
// implemented by child class.
|
|
virtual int
|
|
do_elfsize() const = 0;
|
|
|
|
// Return TRUE if this is a big-endian object file--
|
|
// implemented by child class.
|
|
virtual bool
|
|
do_is_big_endian() const = 0;
|
|
|
|
private:
|
|
// Mapping from input sections to output section.
|
|
Output_sections output_sections_;
|
|
// 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_;
|
|
// Used to store the relocs data computed by the Read_relocs pass.
|
|
// Used during garbage collection of unused sections.
|
|
Read_relocs_data* rd_;
|
|
// Used to store the symbols data computed by the Read_symbols pass.
|
|
// Again used during garbage collection when laying out referenced
|
|
// sections.
|
|
gold::Symbols_data* sd_;
|
|
// Per-symbol counts of relocations, for incremental links.
|
|
unsigned int* reloc_counts_;
|
|
// Per-symbol base indexes of relocations, for incremental links.
|
|
unsigned int* reloc_bases_;
|
|
// Index of the first dynamic relocation for this object.
|
|
unsigned int first_dyn_reloc_;
|
|
// Count of dynamic relocations for this object.
|
|
unsigned int dyn_reloc_count_;
|
|
};
|
|
|
|
// 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
|
|
{
|
|
// This is a relocation against a section symbol. ADDEND is the
|
|
// offset in the section. The result should be the start of some
|
|
// merge area. If the object file wants something else, it should
|
|
// use a regular symbol rather than a section symbol.
|
|
// Unfortunately, PR 6658 shows a case in which the object file
|
|
// refers to the section symbol, but uses a negative ADDEND to
|
|
// compensate for a PC relative reloc. We can't handle the
|
|
// general case. However, we can handle the special case of a
|
|
// negative addend, by assuming that it refers to the start of the
|
|
// section. Of course, that means that we have to guess when
|
|
// ADDEND is negative. It is normal to see a 32-bit value here
|
|
// even when the template parameter size is 64, as 64-bit object
|
|
// file formats have 32-bit relocations. We know this is a merge
|
|
// section, so we know it has to fit into memory. So we assume
|
|
// that we won't see a value larger than a large 32-bit unsigned
|
|
// value. This will break objects with very very large merge
|
|
// sections; they probably break in other ways anyhow.
|
|
Value input_offset = this->input_value_;
|
|
if (addend < 0xffffff00)
|
|
{
|
|
input_offset += addend;
|
|
addend = 0;
|
|
}
|
|
typename Output_addresses::const_iterator p =
|
|
this->output_addresses_.find(input_offset);
|
|
if (p != this->output_addresses_.end())
|
|
return p->second + addend;
|
|
|
|
return (this->value_from_output_section(object, input_shndx, input_offset)
|
|
+ addend);
|
|
}
|
|
|
|
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_ordinary_shndx_(false), is_section_symbol_(false),
|
|
is_tls_symbol_(false), is_ifunc_symbol_(false), has_output_value_(true)
|
|
{ this->u_.value = 0; }
|
|
|
|
~Symbol_value()
|
|
{
|
|
if (!this->has_output_value_)
|
|
delete this->u_.merged_symbol_value;
|
|
}
|
|
|
|
// 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_file<size, big_endian>* object, Value addend) const
|
|
{
|
|
if (this->has_output_value_)
|
|
return this->u_.value + addend;
|
|
else
|
|
{
|
|
gold_assert(this->is_ordinary_shndx_);
|
|
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_ && this->is_ordinary_shndx_);
|
|
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 and (in special cases) relocate_section.
|
|
Value
|
|
input_value() const
|
|
{ return this->u_.value; }
|
|
|
|
// Return whether we have set the index in the output symbol table
|
|
// yet.
|
|
bool
|
|
is_output_symtab_index_set() const
|
|
{
|
|
return (this->output_symtab_index_ != 0
|
|
&& this->output_symtab_index_ != -2U);
|
|
}
|
|
|
|
// Return whether this symbol may be discarded from the normal
|
|
// symbol table.
|
|
bool
|
|
may_be_discarded_from_output_symtab() const
|
|
{
|
|
gold_assert(!this->is_output_symtab_index_set());
|
|
return this->output_symtab_index_ != -2U;
|
|
}
|
|
|
|
// Return whether this symbol has an entry in the output symbol
|
|
// table.
|
|
bool
|
|
has_output_symtab_entry() const
|
|
{
|
|
gold_assert(this->is_output_symtab_index_set());
|
|
return this->output_symtab_index_ != -1U;
|
|
}
|
|
|
|
// Return the index in the output symbol table.
|
|
unsigned int
|
|
output_symtab_index() const
|
|
{
|
|
gold_assert(this->is_output_symtab_index_set()
|
|
&& this->output_symtab_index_ != -1U);
|
|
return this->output_symtab_index_;
|
|
}
|
|
|
|
// Set the index in the output symbol table.
|
|
void
|
|
set_output_symtab_index(unsigned int i)
|
|
{
|
|
gold_assert(!this->is_output_symtab_index_set());
|
|
gold_assert(i != 0 && i != -1U && i != -2U);
|
|
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;
|
|
}
|
|
|
|
// Record that this symbol must go into the output symbol table,
|
|
// because it there is a relocation that uses it.
|
|
void
|
|
set_must_have_output_symtab_entry()
|
|
{
|
|
gold_assert(!this->is_output_symtab_index_set());
|
|
this->output_symtab_index_ = -2U;
|
|
}
|
|
|
|
// 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 dynamic symbol
|
|
// table.
|
|
bool
|
|
needs_output_dynsym_entry() const
|
|
{
|
|
return this->output_dynsym_index_ != -1U;
|
|
}
|
|
|
|
// Return whether this symbol has an entry in the dynamic symbol
|
|
// table.
|
|
bool
|
|
has_output_dynsym_entry() const
|
|
{
|
|
gold_assert(this->output_dynsym_index_ != 0);
|
|
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);
|
|
gold_assert(i != 0 && i != -1U);
|
|
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, bool is_ordinary)
|
|
{
|
|
this->input_shndx_ = i;
|
|
// input_shndx_ field is a bitfield, so make sure that the value
|
|
// fits.
|
|
gold_assert(this->input_shndx_ == i);
|
|
this->is_ordinary_shndx_ = is_ordinary;
|
|
}
|
|
|
|
// Return the index of the input section in the input file.
|
|
unsigned int
|
|
input_shndx(bool* is_ordinary) const
|
|
{
|
|
*is_ordinary = this->is_ordinary_shndx_;
|
|
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_; }
|
|
|
|
// Record that this is an IFUNC symbol.
|
|
void
|
|
set_is_ifunc_symbol()
|
|
{ this->is_ifunc_symbol_ = true; }
|
|
|
|
// Return true if this is an IFUNC symbol.
|
|
bool
|
|
is_ifunc_symbol() const
|
|
{ return this->is_ifunc_symbol_; }
|
|
|
|
// Return true if this has output value.
|
|
bool
|
|
has_output_value() const
|
|
{ return this->has_output_value_; }
|
|
|
|
private:
|
|
// The index of this local symbol in the output symbol table. This
|
|
// will be 0 if no value has been assigned yet, and the symbol may
|
|
// be omitted. This will be -1U if the symbol should not go into
|
|
// the symbol table. This will be -2U if the symbol must go into
|
|
// the symbol table, but no index has been assigned yet.
|
|
unsigned int output_symtab_index_;
|
|
// The index of this local symbol in the dynamic symbol table. This
|
|
// will be -1U 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_ : 27;
|
|
// Whether the section index is an ordinary index, not a special
|
|
// value.
|
|
bool is_ordinary_shndx_ : 1;
|
|
// 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 is a STT_GNU_IFUNC symbol.
|
|
bool is_ifunc_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_;
|
|
};
|
|
|
|
// This type is used to modify relocations for -fsplit-stack. It is
|
|
// indexed by relocation index, and means that the relocation at that
|
|
// index should use the symbol from the vector, rather than the one
|
|
// indicated by the relocation.
|
|
|
|
class Reloc_symbol_changes
|
|
{
|
|
public:
|
|
Reloc_symbol_changes(size_t count)
|
|
: vec_(count, NULL)
|
|
{ }
|
|
|
|
void
|
|
set(size_t i, Symbol* sym)
|
|
{ this->vec_[i] = sym; }
|
|
|
|
const Symbol*
|
|
operator[](size_t i) const
|
|
{ return this->vec_[i]; }
|
|
|
|
private:
|
|
std::vector<Symbol*> vec_;
|
|
};
|
|
|
|
// Abstract base class for a regular object file, either a real object file
|
|
// or an incremental (unchanged) object. 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 Relobj::Symbols Symbols;
|
|
|
|
static const Address invalid_address = static_cast<Address>(0) - 1;
|
|
|
|
Sized_relobj(const std::string& name, Input_file* input_file)
|
|
: Relobj(name, input_file), local_got_offsets_(), section_offsets_()
|
|
{ }
|
|
|
|
Sized_relobj(const std::string& name, Input_file* input_file,
|
|
off_t offset)
|
|
: Relobj(name, input_file, offset), local_got_offsets_(), section_offsets_()
|
|
{ }
|
|
|
|
~Sized_relobj()
|
|
{ }
|
|
|
|
// If this is a regular object, return a pointer to the Sized_relobj_file
|
|
// object. Otherwise, return NULL.
|
|
virtual Sized_relobj_file<size, big_endian>*
|
|
sized_relobj()
|
|
{ return NULL; }
|
|
|
|
const virtual Sized_relobj_file<size, big_endian>*
|
|
sized_relobj() const
|
|
{ return NULL; }
|
|
|
|
// Checks if the offset of input section SHNDX within its output
|
|
// section is invalid.
|
|
bool
|
|
is_output_section_offset_invalid(unsigned int shndx) const
|
|
{ return this->get_output_section_offset(shndx) == invalid_address; }
|
|
|
|
// Get the offset of input section SHNDX within its output section.
|
|
// This is -1 if the input section requires a special mapping, such
|
|
// as a merge section. The output section can be found in the
|
|
// output_sections_ field of the parent class Relobj.
|
|
Address
|
|
get_output_section_offset(unsigned int shndx) const
|
|
{
|
|
gold_assert(shndx < this->section_offsets_.size());
|
|
return this->section_offsets_[shndx];
|
|
}
|
|
|
|
// Iterate over local symbols, calling a visitor class V for each GOT offset
|
|
// associated with a local symbol.
|
|
void
|
|
do_for_all_local_got_entries(Got_offset_list::Visitor* v) const;
|
|
|
|
protected:
|
|
typedef Relobj::Output_sections Output_sections;
|
|
|
|
// Clear the local symbol information.
|
|
void
|
|
clear_got_offsets()
|
|
{ this->local_got_offsets_.clear(); }
|
|
|
|
// Return the vector of section offsets.
|
|
std::vector<Address>&
|
|
section_offsets()
|
|
{ return this->section_offsets_; }
|
|
|
|
// Get the address of an output section.
|
|
uint64_t
|
|
do_output_section_address(unsigned int shndx);
|
|
|
|
// Get the offset of a section.
|
|
uint64_t
|
|
do_output_section_offset(unsigned int shndx) const
|
|
{
|
|
Address off = this->get_output_section_offset(shndx);
|
|
if (off == invalid_address)
|
|
return -1ULL;
|
|
return off;
|
|
}
|
|
|
|
// Set the offset of a section.
|
|
void
|
|
do_set_section_offset(unsigned int shndx, uint64_t off)
|
|
{
|
|
gold_assert(shndx < this->section_offsets_.size());
|
|
this->section_offsets_[shndx] =
|
|
(off == static_cast<uint64_t>(-1)
|
|
? invalid_address
|
|
: convert_types<Address, uint64_t>(off));
|
|
}
|
|
|
|
// Return whether the local symbol SYMNDX plus ADDEND has a GOT offset
|
|
// of type GOT_TYPE.
|
|
bool
|
|
do_local_has_got_offset(unsigned int symndx, unsigned int got_type,
|
|
uint64_t addend) const
|
|
{
|
|
Local_got_entry_key key(symndx, addend);
|
|
Local_got_offsets::const_iterator p =
|
|
this->local_got_offsets_.find(key);
|
|
return (p != this->local_got_offsets_.end()
|
|
&& p->second->get_offset(got_type) != -1U);
|
|
}
|
|
|
|
// Return the GOT offset of type GOT_TYPE of the local symbol
|
|
// SYMNDX plus ADDEND.
|
|
unsigned int
|
|
do_local_got_offset(unsigned int symndx, unsigned int got_type,
|
|
uint64_t addend) const
|
|
{
|
|
Local_got_entry_key key(symndx, addend);
|
|
Local_got_offsets::const_iterator p =
|
|
this->local_got_offsets_.find(key);
|
|
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 with type GOT_TYPE of the local symbol SYMNDX
|
|
// plus ADDEND to GOT_OFFSET.
|
|
void
|
|
do_set_local_got_offset(unsigned int symndx, unsigned int got_type,
|
|
unsigned int got_offset, uint64_t addend)
|
|
{
|
|
Local_got_entry_key key(symndx, addend);
|
|
Local_got_offsets::const_iterator p =
|
|
this->local_got_offsets_.find(key);
|
|
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(key, g));
|
|
gold_assert(ins.second);
|
|
}
|
|
}
|
|
|
|
// Return the word size of the object file.
|
|
virtual int
|
|
do_elfsize() const
|
|
{ return size; }
|
|
|
|
// Return TRUE if this is a big-endian object file.
|
|
virtual bool
|
|
do_is_big_endian() const
|
|
{ return big_endian; }
|
|
|
|
private:
|
|
// The GOT offsets of local symbols. This map also stores GOT offsets
|
|
// for tp-relative offsets for TLS symbols.
|
|
typedef Unordered_map<Local_got_entry_key, Got_offset_list*,
|
|
Local_got_entry_key::hash,
|
|
Local_got_entry_key::equal_to> Local_got_offsets;
|
|
|
|
// GOT offsets for local non-TLS symbols, and tp-relative offsets
|
|
// for TLS symbols, indexed by local got entry key class.
|
|
Local_got_offsets local_got_offsets_;
|
|
// For each input section, the offset of the input section in its
|
|
// output section. This is INVALID_ADDRESS if the input section requires a
|
|
// special mapping.
|
|
std::vector<Address> section_offsets_;
|
|
};
|
|
|
|
// A regular object file. This is size and endian specific.
|
|
|
|
template<int size, bool big_endian>
|
|
class Sized_relobj_file : public Sized_relobj<size, big_endian>
|
|
{
|
|
public:
|
|
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
|
|
typedef typename Sized_relobj<size, big_endian>::Symbols Symbols;
|
|
typedef std::vector<Symbol_value<size> > Local_values;
|
|
|
|
static const Address invalid_address = static_cast<Address>(0) - 1;
|
|
|
|
enum Compute_final_local_value_status
|
|
{
|
|
// No error.
|
|
CFLV_OK,
|
|
// An error occurred.
|
|
CFLV_ERROR,
|
|
// The local symbol has no output section.
|
|
CFLV_DISCARDED
|
|
};
|
|
|
|
Sized_relobj_file(const std::string& name,
|
|
Input_file* input_file,
|
|
off_t offset,
|
|
const typename elfcpp::Ehdr<size, big_endian>&);
|
|
|
|
~Sized_relobj_file();
|
|
|
|
// Set up the object file based on TARGET.
|
|
void
|
|
setup()
|
|
{ this->do_setup(); }
|
|
|
|
// Return a pointer to the Sized_relobj_file object.
|
|
Sized_relobj_file<size, big_endian>*
|
|
sized_relobj()
|
|
{ return this; }
|
|
|
|
const Sized_relobj_file<size, big_endian>*
|
|
sized_relobj() const
|
|
{ return this; }
|
|
|
|
// Return the ELF file type.
|
|
int
|
|
e_type() const
|
|
{ return this->e_type_; }
|
|
|
|
// Return the number of symbols. This is only valid after
|
|
// Object::add_symbols has been called.
|
|
unsigned int
|
|
symbol_count() const
|
|
{ return this->local_symbol_count_ + this->symbols_.size(); }
|
|
|
|
// 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. Set *IS_ORDINARY if this is an ordinary
|
|
// section index, not a special code between SHN_LORESERVE and
|
|
// SHN_HIRESERVE. 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, bool* is_ordinary);
|
|
|
|
// 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, bool* is_ordinary) const
|
|
{
|
|
gold_assert(sym < this->local_values_.size());
|
|
return this->local_values_[sym].input_shndx(is_ordinary);
|
|
}
|
|
|
|
// Record that local symbol SYM must be in the output symbol table.
|
|
void
|
|
set_must_have_output_symtab_entry(unsigned int sym)
|
|
{
|
|
gold_assert(sym < this->local_values_.size());
|
|
this->local_values_[sym].set_must_have_output_symtab_entry();
|
|
}
|
|
|
|
// 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 PLT offset.
|
|
bool
|
|
local_has_plt_offset(unsigned int symndx) const;
|
|
|
|
// Set the PLT offset of the local symbol SYMNDX.
|
|
void
|
|
set_local_plt_offset(unsigned int symndx, unsigned int plt_offset);
|
|
|
|
// Adjust this local symbol value. Return false if the symbol
|
|
// should be discarded from the output file.
|
|
bool
|
|
adjust_local_symbol(Symbol_value<size>* lv) const
|
|
{ return this->do_adjust_local_symbol(lv); }
|
|
|
|
// 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);
|
|
|
|
// Look for a kept section corresponding to the given discarded section,
|
|
// and return its output address. This is used only for relocations in
|
|
// debugging sections.
|
|
Address
|
|
map_to_kept_section(unsigned int shndx, bool* found) const;
|
|
|
|
// Compute final local symbol value. R_SYM is the local symbol index.
|
|
// LV_IN points to a local symbol value containing the input value.
|
|
// LV_OUT points to a local symbol value storing the final output value,
|
|
// which must not be a merged symbol value since before calling this
|
|
// method to avoid memory leak. SYMTAB points to a symbol table.
|
|
//
|
|
// The method returns a status code at return. If the return status is
|
|
// CFLV_OK, *LV_OUT contains the final value. If the return status is
|
|
// CFLV_ERROR, *LV_OUT is 0. If the return status is CFLV_DISCARDED,
|
|
// *LV_OUT is not modified.
|
|
Compute_final_local_value_status
|
|
compute_final_local_value(unsigned int r_sym,
|
|
const Symbol_value<size>* lv_in,
|
|
Symbol_value<size>* lv_out,
|
|
const Symbol_table* symtab);
|
|
|
|
// Return true if the layout for this object was deferred.
|
|
bool is_deferred_layout() const
|
|
{ return this->is_deferred_layout_; }
|
|
|
|
protected:
|
|
typedef typename Sized_relobj<size, big_endian>::Output_sections
|
|
Output_sections;
|
|
|
|
// Set up.
|
|
virtual void
|
|
do_setup();
|
|
|
|
// Read the symbols.
|
|
void
|
|
do_read_symbols(Read_symbols_data*);
|
|
|
|
// Read the symbols. This is common code for all target-specific
|
|
// overrides of do_read_symbols.
|
|
void
|
|
base_read_symbols(Read_symbols_data*);
|
|
|
|
// Return the value of a local symbol.
|
|
uint64_t
|
|
do_local_symbol_value(unsigned int symndx, uint64_t addend) const
|
|
{
|
|
const Symbol_value<size>* symval = this->local_symbol(symndx);
|
|
return symval->value(this, addend);
|
|
}
|
|
|
|
// Return the PLT offset for a local symbol. It is an error to call
|
|
// this if it doesn't have one.
|
|
unsigned int
|
|
do_local_plt_offset(unsigned int symndx) const;
|
|
|
|
// Return whether local symbol SYMNDX is a TLS symbol.
|
|
bool
|
|
do_local_is_tls(unsigned int symndx) const
|
|
{ return this->local_symbol(symndx)->is_tls_symbol(); }
|
|
|
|
// Return the number of local symbols.
|
|
unsigned int
|
|
do_local_symbol_count() const
|
|
{ return this->local_symbol_count_; }
|
|
|
|
// Return the number of local symbols in the output symbol table.
|
|
unsigned int
|
|
do_output_local_symbol_count() const
|
|
{ return this->output_local_symbol_count_; }
|
|
|
|
// Return the number of local symbols in the output symbol table.
|
|
off_t
|
|
do_local_symbol_offset() const
|
|
{ return this->local_symbol_offset_; }
|
|
|
|
// Lay out the input sections.
|
|
void
|
|
do_layout(Symbol_table*, Layout*, Read_symbols_data*);
|
|
|
|
// Layout sections whose layout was deferred while waiting for
|
|
// input files from a plugin.
|
|
void
|
|
do_layout_deferred_sections(Layout*);
|
|
|
|
// Add the symbols to the symbol table.
|
|
void
|
|
do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*);
|
|
|
|
Archive::Should_include
|
|
do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*,
|
|
std::string* why);
|
|
|
|
// Iterate over global symbols, calling a visitor class V for each.
|
|
void
|
|
do_for_all_global_symbols(Read_symbols_data* sd,
|
|
Library_base::Symbol_visitor_base* v);
|
|
|
|
// Read the relocs.
|
|
void
|
|
do_read_relocs(Read_relocs_data*);
|
|
|
|
// Process the relocs to find list of referenced sections. Used only
|
|
// during garbage collection.
|
|
void
|
|
do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*);
|
|
|
|
// Scan the relocs and adjust the symbol table.
|
|
void
|
|
do_scan_relocs(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, Symbol_table*);
|
|
|
|
// 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 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) const
|
|
{ return this->elf_file_.section_name(shndx); }
|
|
|
|
// Return the location of the contents of a section.
|
|
const unsigned char*
|
|
do_section_contents(unsigned int shndx, section_size_type* plen,
|
|
bool cache)
|
|
{
|
|
Object::Location loc(this->elf_file_.section_contents(shndx));
|
|
*plen = convert_to_section_size_type(loc.data_size);
|
|
if (*plen == 0)
|
|
{
|
|
static const unsigned char empty[1] = { '\0' };
|
|
return empty;
|
|
}
|
|
return this->get_view(loc.file_offset, *plen, true, cache);
|
|
}
|
|
|
|
// Return section flags.
|
|
uint64_t
|
|
do_section_flags(unsigned int shndx);
|
|
|
|
// Return section entsize.
|
|
uint64_t
|
|
do_section_entsize(unsigned int 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); }
|
|
|
|
// Return the Xindex structure to use.
|
|
Xindex*
|
|
do_initialize_xindex();
|
|
|
|
// Get symbol counts.
|
|
void
|
|
do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const;
|
|
|
|
// Get the global symbols.
|
|
const Symbols*
|
|
do_get_global_symbols() const
|
|
{ return &this->symbols_; }
|
|
|
|
// Adjust a section index if necessary.
|
|
unsigned int
|
|
adjust_shndx(unsigned int shndx)
|
|
{
|
|
if (shndx >= elfcpp::SHN_LORESERVE)
|
|
shndx += this->elf_file_.large_shndx_offset();
|
|
return shndx;
|
|
}
|
|
|
|
// 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();
|
|
|
|
// Return symbol table section index.
|
|
unsigned int
|
|
symtab_shndx() const
|
|
{ return this->symtab_shndx_; }
|
|
|
|
// Allow a child class to access the ELF file.
|
|
elfcpp::Elf_file<size, big_endian, Object>*
|
|
elf_file()
|
|
{ return &this->elf_file_; }
|
|
|
|
// Allow a child class to access the local values.
|
|
Local_values*
|
|
local_values()
|
|
{ return &this->local_values_; }
|
|
|
|
// 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;
|
|
bool is_ctors_reverse_view;
|
|
};
|
|
|
|
typedef std::vector<View_size> Views;
|
|
|
|
// Stash away info for a number of special sections.
|
|
// Return true if any of the sections found require local symbols to be read.
|
|
virtual bool
|
|
do_find_special_sections(Read_symbols_data* sd);
|
|
|
|
// This may be overriden by a child class.
|
|
virtual void
|
|
do_relocate_sections(const Symbol_table* symtab, const Layout* layout,
|
|
const unsigned char* pshdrs, Output_file* of,
|
|
Views* pviews);
|
|
|
|
// Relocate section data for a range of sections.
|
|
void
|
|
relocate_section_range(const Symbol_table* symtab, const Layout* layout,
|
|
const unsigned char* pshdrs, Output_file* of,
|
|
Views* pviews, unsigned int start_shndx,
|
|
unsigned int end_shndx);
|
|
|
|
// Adjust this local symbol value. Return false if the symbol
|
|
// should be discarded from the output file.
|
|
virtual bool
|
|
do_adjust_local_symbol(Symbol_value<size>*) const
|
|
{ return true; }
|
|
|
|
// Allow a child to set output local symbol count.
|
|
void
|
|
set_output_local_symbol_count(unsigned int value)
|
|
{ this->output_local_symbol_count_ = value; }
|
|
|
|
// Return the output view for a section.
|
|
unsigned char*
|
|
do_get_output_view(unsigned int, section_size_type*) const;
|
|
|
|
private:
|
|
// For convenience.
|
|
typedef Sized_relobj_file<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;
|
|
|
|
// To keep track of discarded comdat sections, we need to map a member
|
|
// section index to the object and section index of the corresponding
|
|
// kept section.
|
|
struct Kept_comdat_section
|
|
{
|
|
Kept_comdat_section(Relobj* a_object, unsigned int a_shndx)
|
|
: object(a_object), shndx(a_shndx)
|
|
{ }
|
|
Relobj* object;
|
|
unsigned int shndx;
|
|
};
|
|
typedef std::map<unsigned int, Kept_comdat_section>
|
|
Kept_comdat_section_table;
|
|
|
|
// 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 unsigned char*, const char*, section_size_type,
|
|
std::vector<bool>*);
|
|
|
|
// Whether to include a linkonce section in the link.
|
|
bool
|
|
include_linkonce_section(Layout*, unsigned int, const char*,
|
|
const elfcpp::Shdr<size, big_endian>&);
|
|
|
|
// Layout an input section.
|
|
void
|
|
layout_section(Layout* layout, unsigned int shndx, const char* name,
|
|
const typename This::Shdr& shdr, unsigned int reloc_shndx,
|
|
unsigned int reloc_type);
|
|
|
|
// Layout an input .eh_frame section.
|
|
void
|
|
layout_eh_frame_section(Layout* layout, const unsigned char* symbols_data,
|
|
section_size_type symbols_size,
|
|
const unsigned char* symbol_names_data,
|
|
section_size_type symbol_names_size,
|
|
unsigned int shndx, const typename This::Shdr&,
|
|
unsigned int reloc_shndx, unsigned int reloc_type);
|
|
|
|
// Write section data to the output file. Record the views and
|
|
// sizes in VIEWS for use when relocating.
|
|
void
|
|
write_sections(const Layout*, const unsigned char* pshdrs, Output_file*,
|
|
Views*);
|
|
|
|
// Relocate the sections in the output file.
|
|
void
|
|
relocate_sections(const Symbol_table* symtab, const Layout* layout,
|
|
const unsigned char* pshdrs, Output_file* of,
|
|
Views* pviews)
|
|
{ this->do_relocate_sections(symtab, layout, pshdrs, of, pviews); }
|
|
|
|
// Reverse the words in a section. Used for .ctors sections mapped
|
|
// to .init_array sections.
|
|
void
|
|
reverse_words(unsigned char*, section_size_type);
|
|
|
|
// Scan the input relocations for --emit-relocs.
|
|
void
|
|
emit_relocs_scan(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(Symbol_table*, Layout*,
|
|
const unsigned char* plocal_syms,
|
|
const Read_relocs_data::Relocs_list::iterator&,
|
|
Relocatable_relocs*);
|
|
|
|
// Scan the input relocations for --incremental.
|
|
void
|
|
incremental_relocs_scan(const Read_relocs_data::Relocs_list::iterator&);
|
|
|
|
// Scan the input relocations for --incremental, templatized on the
|
|
// type of the relocation section.
|
|
template<int sh_type>
|
|
void
|
|
incremental_relocs_scan_reltype(
|
|
const Read_relocs_data::Relocs_list::iterator&);
|
|
|
|
void
|
|
incremental_relocs_write(const Relocate_info<size, big_endian>*,
|
|
unsigned int sh_type,
|
|
const unsigned char* prelocs,
|
|
size_t reloc_count,
|
|
Output_section*,
|
|
Address output_offset,
|
|
Output_file*);
|
|
|
|
template<int sh_type>
|
|
void
|
|
incremental_relocs_write_reltype(const Relocate_info<size, big_endian>*,
|
|
const unsigned char* prelocs,
|
|
size_t reloc_count,
|
|
Output_section*,
|
|
Address output_offset,
|
|
Output_file*);
|
|
|
|
// A type shared by split_stack_adjust_reltype and find_functions.
|
|
typedef std::map<section_offset_type, section_size_type> Function_offsets;
|
|
|
|
// Check for -fsplit-stack routines calling non-split-stack routines.
|
|
void
|
|
split_stack_adjust(const Symbol_table*, const unsigned char* pshdrs,
|
|
unsigned int sh_type, unsigned int shndx,
|
|
const unsigned char* prelocs, size_t reloc_count,
|
|
unsigned char* view, section_size_type view_size,
|
|
Reloc_symbol_changes** reloc_map,
|
|
const Sized_target<size, big_endian>* target);
|
|
|
|
template<int sh_type>
|
|
void
|
|
split_stack_adjust_reltype(const Symbol_table*, const unsigned char* pshdrs,
|
|
unsigned int shndx, const unsigned char* prelocs,
|
|
size_t reloc_count, unsigned char* view,
|
|
section_size_type view_size,
|
|
Reloc_symbol_changes** reloc_map,
|
|
const Sized_target<size, big_endian>* target);
|
|
|
|
// Find all functions in a section.
|
|
void
|
|
find_functions(const unsigned char* pshdrs, unsigned int shndx,
|
|
Function_offsets*);
|
|
|
|
// Write out the local symbols.
|
|
void
|
|
write_local_symbols(Output_file*,
|
|
const Stringpool_template<char>*,
|
|
const Stringpool_template<char>*,
|
|
Output_symtab_xindex*,
|
|
Output_symtab_xindex*,
|
|
off_t);
|
|
|
|
// Record a mapping from discarded section SHNDX to the corresponding
|
|
// kept section.
|
|
void
|
|
set_kept_comdat_section(unsigned int shndx, Relobj* kept_object,
|
|
unsigned int kept_shndx)
|
|
{
|
|
Kept_comdat_section kept(kept_object, kept_shndx);
|
|
this->kept_comdat_sections_.insert(std::make_pair(shndx, kept));
|
|
}
|
|
|
|
// Find the kept section corresponding to the discarded section
|
|
// SHNDX. Return true if found.
|
|
bool
|
|
get_kept_comdat_section(unsigned int shndx, Relobj** kept_object,
|
|
unsigned int* kept_shndx) const
|
|
{
|
|
typename Kept_comdat_section_table::const_iterator p =
|
|
this->kept_comdat_sections_.find(shndx);
|
|
if (p == this->kept_comdat_sections_.end())
|
|
return false;
|
|
*kept_object = p->second.object;
|
|
*kept_shndx = p->second.shndx;
|
|
return true;
|
|
}
|
|
|
|
// Compute final local symbol value. R_SYM is the local symbol index.
|
|
// LV_IN points to a local symbol value containing the input value.
|
|
// LV_OUT points to a local symbol value storing the final output value,
|
|
// which must not be a merged symbol value since before calling this
|
|
// method to avoid memory leak. RELOCATABLE indicates whether we are
|
|
// linking a relocatable output. OUT_SECTIONS is an array of output
|
|
// sections. OUT_OFFSETS is an array of offsets of the sections. SYMTAB
|
|
// points to a symbol table.
|
|
//
|
|
// The method returns a status code at return. If the return status is
|
|
// CFLV_OK, *LV_OUT contains the final value. If the return status is
|
|
// CFLV_ERROR, *LV_OUT is 0. If the return status is CFLV_DISCARDED,
|
|
// *LV_OUT is not modified.
|
|
inline Compute_final_local_value_status
|
|
compute_final_local_value_internal(unsigned int r_sym,
|
|
const Symbol_value<size>* lv_in,
|
|
Symbol_value<size>* lv_out,
|
|
bool relocatable,
|
|
const Output_sections& out_sections,
|
|
const std::vector<Address>& out_offsets,
|
|
const Symbol_table* symtab);
|
|
|
|
// The PLT offsets of local symbols.
|
|
typedef Unordered_map<unsigned int, unsigned int> Local_plt_offsets;
|
|
|
|
// Saved information for sections whose layout was deferred.
|
|
struct Deferred_layout
|
|
{
|
|
static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
|
|
Deferred_layout(unsigned int shndx, const char* name,
|
|
const unsigned char* pshdr,
|
|
unsigned int reloc_shndx, unsigned int reloc_type)
|
|
: shndx_(shndx), name_(name), reloc_shndx_(reloc_shndx),
|
|
reloc_type_(reloc_type)
|
|
{
|
|
memcpy(this->shdr_data_, pshdr, shdr_size);
|
|
}
|
|
unsigned int shndx_;
|
|
std::string name_;
|
|
unsigned int reloc_shndx_;
|
|
unsigned int reloc_type_;
|
|
unsigned char shdr_data_[shdr_size];
|
|
};
|
|
|
|
// General access to the ELF file.
|
|
elfcpp::Elf_file<size, big_endian, Object> elf_file_;
|
|
// Type of ELF file (ET_REL or ET_EXEC). ET_EXEC files are allowed
|
|
// as input files only for the --just-symbols option.
|
|
int e_type_;
|
|
// 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_;
|
|
// Number of symbols defined in object file itself.
|
|
size_t defined_count_;
|
|
// File offset for local symbols (relative to start of symbol table).
|
|
off_t local_symbol_offset_;
|
|
// File offset for local dynamic symbols (absolute).
|
|
off_t local_dynsym_offset_;
|
|
// Values of local symbols.
|
|
Local_values local_values_;
|
|
// PLT offsets for local symbols.
|
|
Local_plt_offsets local_plt_offsets_;
|
|
// Table mapping discarded comdat sections to corresponding kept sections.
|
|
Kept_comdat_section_table kept_comdat_sections_;
|
|
// Whether this object has a GNU style .eh_frame section.
|
|
bool has_eh_frame_;
|
|
// If this object has a GNU style .eh_frame section that is discarded in
|
|
// output, record the index here. Otherwise it is -1U.
|
|
unsigned int discarded_eh_frame_shndx_;
|
|
// True if the layout of this object was deferred, waiting for plugin
|
|
// replacement files.
|
|
bool is_deferred_layout_;
|
|
// The list of sections whose layout was deferred.
|
|
std::vector<Deferred_layout> deferred_layout_;
|
|
// The list of relocation sections whose layout was deferred.
|
|
std::vector<Deferred_layout> deferred_layout_relocs_;
|
|
// Pointer to the list of output views; valid only during do_relocate().
|
|
const Views* output_views_;
|
|
};
|
|
|
|
// A class to manage the list of all objects.
|
|
|
|
class Input_objects
|
|
{
|
|
public:
|
|
Input_objects()
|
|
: relobj_list_(), dynobj_list_(), sonames_(), cref_(NULL)
|
|
{ }
|
|
|
|
// 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*);
|
|
|
|
// Start processing an archive.
|
|
void
|
|
archive_start(Archive*);
|
|
|
|
// Stop processing an archive.
|
|
void
|
|
archive_stop(Archive*);
|
|
|
|
// 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;
|
|
|
|
// Print symbol counts.
|
|
void
|
|
print_symbol_counts(const Symbol_table*) const;
|
|
|
|
// Print a cross reference table.
|
|
void
|
|
print_cref(const Symbol_table*, FILE*) 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 non dynamic objects.
|
|
int
|
|
number_of_relobjs() const
|
|
{ return this->relobj_list_.size(); }
|
|
|
|
// 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_map<std::string, Object*> sonames_;
|
|
// Manage cross-references if requested.
|
|
Cref* cref_;
|
|
};
|
|
|
|
// 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
|
|
{
|
|
// Symbol table.
|
|
const Symbol_table* symtab;
|
|
// Layout.
|
|
const Layout* layout;
|
|
// Object being relocated.
|
|
Sized_relobj_file<size, big_endian>* object;
|
|
// Section index of relocation section.
|
|
unsigned int reloc_shndx;
|
|
// Section header of relocation section.
|
|
const unsigned char* reloc_shdr;
|
|
// Info about how relocs should be handled
|
|
Relocatable_relocs* rr;
|
|
// Section index of section being relocated.
|
|
unsigned int data_shndx;
|
|
// Section header of data section.
|
|
const unsigned char* data_shdr;
|
|
|
|
// 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;
|
|
};
|
|
|
|
// This is used to represent a section in an object and is used as the
|
|
// key type for various section maps.
|
|
typedef std::pair<Relobj*, unsigned int> Section_id;
|
|
|
|
// This is similar to Section_id but is used when the section
|
|
// pointers are const.
|
|
typedef std::pair<const Relobj*, unsigned int> Const_section_id;
|
|
|
|
// The hash value is based on the address of an object in memory during
|
|
// linking. It is okay to use this for looking up sections but never use
|
|
// this in an unordered container that we want to traverse in a repeatable
|
|
// manner.
|
|
|
|
struct Section_id_hash
|
|
{
|
|
size_t operator()(const Section_id& loc) const
|
|
{ return reinterpret_cast<uintptr_t>(loc.first) ^ loc.second; }
|
|
};
|
|
|
|
struct Const_section_id_hash
|
|
{
|
|
size_t operator()(const Const_section_id& loc) const
|
|
{ return reinterpret_cast<uintptr_t>(loc.first) ^ loc.second; }
|
|
};
|
|
|
|
// Return whether INPUT_FILE contains an ELF object start at file
|
|
// offset OFFSET. This sets *START to point to a view of the start of
|
|
// the file. It sets *READ_SIZE to the number of bytes in the view.
|
|
|
|
extern bool
|
|
is_elf_object(Input_file* input_file, off_t offset,
|
|
const unsigned char** start, int* read_size);
|
|
|
|
// Return an Object appropriate for the input file. P is BYTES long,
|
|
// and holds the ELF header. If PUNCONFIGURED is not NULL, then if
|
|
// this sees an object the linker is not configured to support, it
|
|
// sets *PUNCONFIGURED to true and returns NULL without giving an
|
|
// error message.
|
|
|
|
extern Object*
|
|
make_elf_object(const std::string& name, Input_file*,
|
|
off_t offset, const unsigned char* p,
|
|
section_offset_type bytes, bool* punconfigured);
|
|
|
|
} // end namespace gold
|
|
|
|
#endif // !defined(GOLD_OBJECT_H)
|