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// dynobj.h -- dynamic object support for gold -*- C++ -*-
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// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#ifndef GOLD_DYNOBJ_H
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#define GOLD_DYNOBJ_H
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#include <vector>
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#include "stringpool.h"
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#include "object.h"
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namespace gold
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{
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class Version_script_info;
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// A dynamic object (ET_DYN). This is an abstract base class itself.
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// The implementations is the template class Sized_dynobj.
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class Dynobj : public Object
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{
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public:
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// We keep a list of all the DT_NEEDED entries we find.
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typedef std::vector<std::string> Needed;
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Dynobj(const std::string& name, Input_file* input_file, off_t offset = 0);
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// Return the name to use in a DT_NEEDED entry for this object.
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const char*
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soname() const
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{ return this->soname_.c_str(); }
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// Return the list of DT_NEEDED strings.
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const Needed&
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needed() const
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{ return this->needed_; }
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// Return whether this dynamic object has any DT_NEEDED entries
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// which were not seen during the link.
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bool
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has_unknown_needed_entries() const
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{
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gold_assert(this->unknown_needed_ != UNKNOWN_NEEDED_UNSET);
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return this->unknown_needed_ == UNKNOWN_NEEDED_TRUE;
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}
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// Set whether this dynamic object has any DT_NEEDED entries which
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// were not seen during the link.
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void
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set_has_unknown_needed_entries(bool set)
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{
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gold_assert(this->unknown_needed_ == UNKNOWN_NEEDED_UNSET);
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this->unknown_needed_ = set ? UNKNOWN_NEEDED_TRUE : UNKNOWN_NEEDED_FALSE;
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}
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// Compute the ELF hash code for a string.
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static uint32_t
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elf_hash(const char*);
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// Create a standard ELF hash table, setting *PPHASH and *PHASHLEN.
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// DYNSYMS is the global dynamic symbols. LOCAL_DYNSYM_COUNT is the
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// number of local dynamic symbols, which is the index of the first
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// dynamic gobal symbol.
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static void
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create_elf_hash_table(const std::vector<Symbol*>& dynsyms,
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unsigned int local_dynsym_count,
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unsigned char** pphash,
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unsigned int* phashlen);
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// Create a GNU hash table, setting *PPHASH and *PHASHLEN. DYNSYMS
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// is the global dynamic symbols. LOCAL_DYNSYM_COUNT is the number
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// of local dynamic symbols, which is the index of the first dynamic
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// gobal symbol.
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static void
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create_gnu_hash_table(const std::vector<Symbol*>& dynsyms,
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unsigned int local_dynsym_count,
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unsigned char** pphash, unsigned int* phashlen);
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protected:
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// Set the DT_SONAME string.
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void
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set_soname_string(const char* s)
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{ this->soname_.assign(s); }
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// Add an entry to the list of DT_NEEDED strings.
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void
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add_needed(const char* s)
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{ this->needed_.push_back(std::string(s)); }
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private:
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// Compute the GNU hash code for a string.
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static uint32_t
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gnu_hash(const char*);
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// Compute the number of hash buckets to use.
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static unsigned int
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compute_bucket_count(const std::vector<uint32_t>& hashcodes,
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bool for_gnu_hash_table);
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// Sized version of create_elf_hash_table.
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template<bool big_endian>
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static void
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sized_create_elf_hash_table(const std::vector<uint32_t>& bucket,
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const std::vector<uint32_t>& chain,
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unsigned char* phash,
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unsigned int hashlen);
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// Sized version of create_gnu_hash_table.
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template<int size, bool big_endian>
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static void
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sized_create_gnu_hash_table(const std::vector<Symbol*>& hashed_dynsyms,
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const std::vector<uint32_t>& dynsym_hashvals,
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unsigned int unhashed_dynsym_count,
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unsigned char** pphash,
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unsigned int* phashlen);
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// Values for the has_unknown_needed_entries_ field.
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enum Unknown_needed
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{
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UNKNOWN_NEEDED_UNSET,
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UNKNOWN_NEEDED_TRUE,
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UNKNOWN_NEEDED_FALSE
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};
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// The DT_SONAME name, if any.
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std::string soname_;
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// The list of DT_NEEDED entries.
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Needed needed_;
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// Whether this dynamic object has any DT_NEEDED entries not seen
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// during the link.
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Unknown_needed unknown_needed_;
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};
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// A dynamic object, size and endian specific version.
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template<int size, bool big_endian>
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class Sized_dynobj : public Dynobj
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{
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public:
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typedef typename Sized_relobj<size, big_endian>::Symbols Symbols;
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Sized_dynobj(const std::string& name, Input_file* input_file, off_t offset,
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const typename elfcpp::Ehdr<size, big_endian>&);
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// Set up the object file based on the ELF header.
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void
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setup(const typename elfcpp::Ehdr<size, big_endian>&);
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// Read the symbols.
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void
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do_read_symbols(Read_symbols_data*);
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// Lay out the input sections.
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void
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do_layout(Symbol_table*, Layout*, Read_symbols_data*);
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// Add the symbols to the symbol table.
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void
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do_add_symbols(Symbol_table*, Read_symbols_data*);
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// Get the size of a section.
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uint64_t
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do_section_size(unsigned int shndx)
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{ return this->elf_file_.section_size(shndx); }
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// Get the name of a section.
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std::string
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do_section_name(unsigned int shndx)
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{ return this->elf_file_.section_name(shndx); }
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// Return a view of the contents of a section. Set *PLEN to the
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// size.
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Object::Location
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do_section_contents(unsigned int shndx)
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{ return this->elf_file_.section_contents(shndx); }
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// Return section flags.
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uint64_t
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do_section_flags(unsigned int shndx)
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{ return this->elf_file_.section_flags(shndx); }
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// Return section address.
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uint64_t
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do_section_address(unsigned int shndx)
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{ return this->elf_file_.section_addr(shndx); }
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// Return section type.
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unsigned int
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do_section_type(unsigned int shndx)
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{ return this->elf_file_.section_type(shndx); }
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// Return the section link field.
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unsigned int
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do_section_link(unsigned int shndx)
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{ return this->elf_file_.section_link(shndx); }
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// Return the section link field.
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unsigned int
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do_section_info(unsigned int shndx)
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{ return this->elf_file_.section_info(shndx); }
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// Return the section alignment.
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uint64_t
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do_section_addralign(unsigned int shndx)
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{ return this->elf_file_.section_addralign(shndx); }
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// Return the Xindex structure to use.
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Xindex*
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do_initialize_xindex();
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// Get symbol counts.
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void
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do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const;
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private:
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// For convenience.
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typedef Sized_dynobj<size, big_endian> This;
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static const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
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static const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
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static const int dyn_size = elfcpp::Elf_sizes<size>::dyn_size;
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typedef elfcpp::Shdr<size, big_endian> Shdr;
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typedef elfcpp::Dyn<size, big_endian> Dyn;
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// Adjust a section index if necessary.
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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->elf_file_.large_shndx_offset();
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return shndx;
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}
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// Find the dynamic symbol table and the version sections, given the
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// section headers.
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void
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find_dynsym_sections(const unsigned char* pshdrs,
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unsigned int* pversym_shndx,
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unsigned int* pverdef_shndx,
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unsigned int* pverneed_shndx,
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unsigned int* pdynamic_shndx);
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// Read the dynamic symbol section SHNDX.
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void
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read_dynsym_section(const unsigned char* pshdrs, unsigned int shndx,
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elfcpp::SHT type, unsigned int link,
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File_view** view, section_size_type* view_size,
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unsigned int* view_info);
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// Read the dynamic tags.
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void
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read_dynamic(const unsigned char* pshdrs, unsigned int dynamic_shndx,
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unsigned int strtab_shndx, const unsigned char* strtabu,
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off_t strtab_size);
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// Mapping from version number to version name.
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typedef std::vector<const char*> Version_map;
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// Create the version map.
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void
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make_version_map(Read_symbols_data* sd, Version_map*) const;
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// Add version definitions to the version map.
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void
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make_verdef_map(Read_symbols_data* sd, Version_map*) const;
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// Add version references to the version map.
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void
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make_verneed_map(Read_symbols_data* sd, Version_map*) const;
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// Add an entry to the version map.
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void
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set_version_map(Version_map*, unsigned int ndx, const char* name) const;
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// General access to the ELF file.
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elfcpp::Elf_file<size, big_endian, Object> elf_file_;
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// The section index of the dynamic symbol table.
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unsigned int dynsym_shndx_;
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// The entries in the symbol table for the symbols. We only keep
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// this if we need it to print symbol information.
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Symbols* symbols_;
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// Number of defined symbols.
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size_t defined_count_;
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};
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// A base class for Verdef and Verneed_version which just handles the
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// version index which will be stored in the SHT_GNU_versym section.
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class Version_base
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{
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public:
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Version_base()
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: index_(-1U)
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{ }
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virtual
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~Version_base()
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{ }
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// Return the version index.
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unsigned int
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index() const
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{
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gold_assert(this->index_ != -1U);
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return this->index_;
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}
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// Set the version index.
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void
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set_index(unsigned int index)
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{
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gold_assert(this->index_ == -1U);
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this->index_ = index;
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}
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// Clear the weak flag in a version definition.
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virtual void
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clear_weak() = 0;
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private:
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Version_base(const Version_base&);
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Version_base& operator=(const Version_base&);
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// The index of the version definition or reference.
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unsigned int index_;
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};
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// This class handles a version being defined in the file we are
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// generating.
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class Verdef : public Version_base
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{
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public:
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Verdef(const char* name, const std::vector<std::string>& deps,
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bool is_base, bool is_weak, bool is_symbol_created)
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: name_(name), deps_(deps), is_base_(is_base), is_weak_(is_weak),
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is_symbol_created_(is_symbol_created)
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{ }
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// Return the version name.
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const char*
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name() const
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{ return this->name_; }
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// Return the number of dependencies.
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364 |
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unsigned int
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count_dependencies() const
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{ return this->deps_.size(); }
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|
// Add a dependency to this version. The NAME should be
|
369 |
|
|
// canonicalized in the dynamic Stringpool.
|
370 |
|
|
void
|
371 |
|
|
add_dependency(const char* name)
|
372 |
|
|
{ this->deps_.push_back(name); }
|
373 |
|
|
|
374 |
|
|
// Return whether this definition is weak.
|
375 |
|
|
bool
|
376 |
|
|
is_weak() const
|
377 |
|
|
{ return this->is_weak_; }
|
378 |
|
|
|
379 |
|
|
// Clear the weak flag.
|
380 |
|
|
void
|
381 |
|
|
clear_weak()
|
382 |
|
|
{ this->is_weak_ = false; }
|
383 |
|
|
|
384 |
|
|
// Return whether a version symbol has been created for this
|
385 |
|
|
// definition.
|
386 |
|
|
bool
|
387 |
|
|
is_symbol_created() const
|
388 |
|
|
{ return this->is_symbol_created_; }
|
389 |
|
|
|
390 |
|
|
// Write contents to buffer.
|
391 |
|
|
template<int size, bool big_endian>
|
392 |
|
|
unsigned char*
|
393 |
|
|
write(const Stringpool*, bool is_last, unsigned char*) const;
|
394 |
|
|
|
395 |
|
|
private:
|
396 |
|
|
Verdef(const Verdef&);
|
397 |
|
|
Verdef& operator=(const Verdef&);
|
398 |
|
|
|
399 |
|
|
// The type of the list of version dependencies. Each dependency
|
400 |
|
|
// should be canonicalized in the dynamic Stringpool.
|
401 |
|
|
typedef std::vector<std::string> Deps;
|
402 |
|
|
|
403 |
|
|
// The name of this version. This should be canonicalized in the
|
404 |
|
|
// dynamic Stringpool.
|
405 |
|
|
const char* name_;
|
406 |
|
|
// A list of other versions which this version depends upon.
|
407 |
|
|
Deps deps_;
|
408 |
|
|
// Whether this is the base version.
|
409 |
|
|
bool is_base_;
|
410 |
|
|
// Whether this version is weak.
|
411 |
|
|
bool is_weak_;
|
412 |
|
|
// Whether a version symbol has been created.
|
413 |
|
|
bool is_symbol_created_;
|
414 |
|
|
};
|
415 |
|
|
|
416 |
|
|
// A referened version. This will be associated with a filename by
|
417 |
|
|
// Verneed.
|
418 |
|
|
|
419 |
|
|
class Verneed_version : public Version_base
|
420 |
|
|
{
|
421 |
|
|
public:
|
422 |
|
|
Verneed_version(const char* version)
|
423 |
|
|
: version_(version)
|
424 |
|
|
{ }
|
425 |
|
|
|
426 |
|
|
// Return the version name.
|
427 |
|
|
const char*
|
428 |
|
|
version() const
|
429 |
|
|
{ return this->version_; }
|
430 |
|
|
|
431 |
|
|
// Clear the weak flag. This is invalid for a reference.
|
432 |
|
|
void
|
433 |
|
|
clear_weak()
|
434 |
|
|
{ gold_unreachable(); }
|
435 |
|
|
|
436 |
|
|
private:
|
437 |
|
|
Verneed_version(const Verneed_version&);
|
438 |
|
|
Verneed_version& operator=(const Verneed_version&);
|
439 |
|
|
|
440 |
|
|
const char* version_;
|
441 |
|
|
};
|
442 |
|
|
|
443 |
|
|
// Version references in a single dynamic object.
|
444 |
|
|
|
445 |
|
|
class Verneed
|
446 |
|
|
{
|
447 |
|
|
public:
|
448 |
|
|
Verneed(const char* filename)
|
449 |
|
|
: filename_(filename), need_versions_()
|
450 |
|
|
{ }
|
451 |
|
|
|
452 |
|
|
~Verneed();
|
453 |
|
|
|
454 |
|
|
// Return the file name.
|
455 |
|
|
const char*
|
456 |
|
|
filename() const
|
457 |
|
|
{ return this->filename_; }
|
458 |
|
|
|
459 |
|
|
// Return the number of versions.
|
460 |
|
|
unsigned int
|
461 |
|
|
count_versions() const
|
462 |
|
|
{ return this->need_versions_.size(); }
|
463 |
|
|
|
464 |
|
|
// Add a version name. The name should be canonicalized in the
|
465 |
|
|
// dynamic Stringpool. If the name is already present, this does
|
466 |
|
|
// nothing.
|
467 |
|
|
Verneed_version*
|
468 |
|
|
add_name(const char* name);
|
469 |
|
|
|
470 |
|
|
// Set the version indexes, starting at INDEX. Return the updated
|
471 |
|
|
// INDEX.
|
472 |
|
|
unsigned int
|
473 |
|
|
finalize(unsigned int index);
|
474 |
|
|
|
475 |
|
|
// Write contents to buffer.
|
476 |
|
|
template<int size, bool big_endian>
|
477 |
|
|
unsigned char*
|
478 |
|
|
write(const Stringpool*, bool is_last, unsigned char*) const;
|
479 |
|
|
|
480 |
|
|
private:
|
481 |
|
|
Verneed(const Verneed&);
|
482 |
|
|
Verneed& operator=(const Verneed&);
|
483 |
|
|
|
484 |
|
|
// The type of the list of version names. Each name should be
|
485 |
|
|
// canonicalized in the dynamic Stringpool.
|
486 |
|
|
typedef std::vector<Verneed_version*> Need_versions;
|
487 |
|
|
|
488 |
|
|
// The filename of the dynamic object. This should be
|
489 |
|
|
// canonicalized in the dynamic Stringpool.
|
490 |
|
|
const char* filename_;
|
491 |
|
|
// The list of version names.
|
492 |
|
|
Need_versions need_versions_;
|
493 |
|
|
};
|
494 |
|
|
|
495 |
|
|
// This class handles version definitions and references which go into
|
496 |
|
|
// the output file.
|
497 |
|
|
|
498 |
|
|
class Versions
|
499 |
|
|
{
|
500 |
|
|
public:
|
501 |
|
|
Versions(const Version_script_info&, Stringpool*);
|
502 |
|
|
|
503 |
|
|
~Versions();
|
504 |
|
|
|
505 |
|
|
// SYM is going into the dynamic symbol table and has a version.
|
506 |
|
|
// Record the appropriate version information.
|
507 |
|
|
void
|
508 |
|
|
record_version(const Symbol_table* symtab, Stringpool*, const Symbol* sym);
|
509 |
|
|
|
510 |
|
|
// Set the version indexes. DYNSYM_INDEX is the index we should use
|
511 |
|
|
// for the next dynamic symbol. We add new dynamic symbols to SYMS
|
512 |
|
|
// and return an updated DYNSYM_INDEX.
|
513 |
|
|
unsigned int
|
514 |
|
|
finalize(Symbol_table* symtab, unsigned int dynsym_index,
|
515 |
|
|
std::vector<Symbol*>* syms);
|
516 |
|
|
|
517 |
|
|
// Return whether there are any version definitions.
|
518 |
|
|
bool
|
519 |
|
|
any_defs() const
|
520 |
|
|
{ return !this->defs_.empty(); }
|
521 |
|
|
|
522 |
|
|
// Return whether there are any version references.
|
523 |
|
|
bool
|
524 |
|
|
any_needs() const
|
525 |
|
|
{ return !this->needs_.empty(); }
|
526 |
|
|
|
527 |
|
|
// Build an allocated buffer holding the contents of the symbol
|
528 |
|
|
// version section (.gnu.version).
|
529 |
|
|
template<int size, bool big_endian>
|
530 |
|
|
void
|
531 |
|
|
symbol_section_contents(const Symbol_table*, const Stringpool*,
|
532 |
|
|
unsigned int local_symcount,
|
533 |
|
|
const std::vector<Symbol*>& syms,
|
534 |
|
|
unsigned char**, unsigned int*) const;
|
535 |
|
|
|
536 |
|
|
// Build an allocated buffer holding the contents of the version
|
537 |
|
|
// definition section (.gnu.version_d).
|
538 |
|
|
template<int size, bool big_endian>
|
539 |
|
|
void
|
540 |
|
|
def_section_contents(const Stringpool*, unsigned char**,
|
541 |
|
|
unsigned int* psize, unsigned int* pentries) const;
|
542 |
|
|
|
543 |
|
|
// Build an allocated buffer holding the contents of the version
|
544 |
|
|
// reference section (.gnu.version_r).
|
545 |
|
|
template<int size, bool big_endian>
|
546 |
|
|
void
|
547 |
|
|
need_section_contents(const Stringpool*, unsigned char**,
|
548 |
|
|
unsigned int* psize, unsigned int* pentries) const;
|
549 |
|
|
|
550 |
|
|
const Version_script_info&
|
551 |
|
|
version_script() const
|
552 |
|
|
{ return this->version_script_; }
|
553 |
|
|
|
554 |
|
|
private:
|
555 |
|
|
Versions(const Versions&);
|
556 |
|
|
Versions& operator=(const Versions&);
|
557 |
|
|
|
558 |
|
|
// The type of the list of version definitions.
|
559 |
|
|
typedef std::vector<Verdef*> Defs;
|
560 |
|
|
|
561 |
|
|
// The type of the list of version references.
|
562 |
|
|
typedef std::vector<Verneed*> Needs;
|
563 |
|
|
|
564 |
|
|
// Handle a symbol SYM defined with version VERSION.
|
565 |
|
|
void
|
566 |
|
|
add_def(const Symbol* sym, const char* version, Stringpool::Key);
|
567 |
|
|
|
568 |
|
|
// Add a reference to version NAME in file FILENAME.
|
569 |
|
|
void
|
570 |
|
|
add_need(Stringpool*, const char* filename, const char* name,
|
571 |
|
|
Stringpool::Key);
|
572 |
|
|
|
573 |
|
|
// Get the dynamic object to use for SYM.
|
574 |
|
|
Dynobj*
|
575 |
|
|
get_dynobj_for_sym(const Symbol_table*, const Symbol* sym) const;
|
576 |
|
|
|
577 |
|
|
// Return the version index to use for SYM.
|
578 |
|
|
unsigned int
|
579 |
|
|
version_index(const Symbol_table*, const Stringpool*,
|
580 |
|
|
const Symbol* sym) const;
|
581 |
|
|
|
582 |
|
|
// We keep a hash table mapping canonicalized name/version pairs to
|
583 |
|
|
// a version base.
|
584 |
|
|
typedef std::pair<Stringpool::Key, Stringpool::Key> Key;
|
585 |
|
|
|
586 |
|
|
struct Version_table_hash
|
587 |
|
|
{
|
588 |
|
|
size_t
|
589 |
|
|
operator()(const Key& k) const
|
590 |
|
|
{ return k.first + k.second; }
|
591 |
|
|
};
|
592 |
|
|
|
593 |
|
|
struct Version_table_eq
|
594 |
|
|
{
|
595 |
|
|
bool
|
596 |
|
|
operator()(const Key& k1, const Key& k2) const
|
597 |
|
|
{ return k1.first == k2.first && k1.second == k2.second; }
|
598 |
|
|
};
|
599 |
|
|
|
600 |
|
|
typedef Unordered_map<Key, Version_base*, Version_table_hash,
|
601 |
|
|
Version_table_eq> Version_table;
|
602 |
|
|
|
603 |
|
|
// The version definitions.
|
604 |
|
|
Defs defs_;
|
605 |
|
|
// The version references.
|
606 |
|
|
Needs needs_;
|
607 |
|
|
// The mapping from a canonicalized version/filename pair to a
|
608 |
|
|
// version index. The filename may be NULL.
|
609 |
|
|
Version_table version_table_;
|
610 |
|
|
// Whether the version indexes have been set.
|
611 |
|
|
bool is_finalized_;
|
612 |
|
|
// Contents of --version-script, if passed, or NULL.
|
613 |
|
|
const Version_script_info& version_script_;
|
614 |
|
|
};
|
615 |
|
|
|
616 |
|
|
} // End namespace gold.
|
617 |
|
|
|
618 |
|
|
#endif // !defined(GOLD_DYNOBJ_H)
|