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- // object.h -- support for an object file for linking in gold -*- C++ -*-
- // Copyright (C) 2006-2022 Free Software Foundation, Inc.
- // Written by Ian Lance Taylor <iant@google.com>.
- // This file is part of gold.
- // This program is free software; you can redistribute it and/or modify
- // it under the terms of the GNU General Public License as published by
- // the Free Software Foundation; either version 3 of the License, or
- // (at your option) any later version.
- // This program is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- // You should have received a copy of the GNU General Public License
- // along with this program; if not, write to the Free Software
- // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
- // MA 02110-1301, USA.
- #ifndef GOLD_OBJECT_H
- #define GOLD_OBJECT_H
- #include <string>
- #include <vector>
- #include "elfcpp.h"
- #include "elfcpp_file.h"
- #include "fileread.h"
- #include "target.h"
- #include "archive.h"
- namespace gold
- {
- class General_options;
- class Task;
- class Cref;
- class Layout;
- class Kept_section;
- class Output_data;
- class Output_section;
- class Output_section_data;
- class Output_file;
- class Output_symtab_xindex;
- class Pluginobj;
- class Dynobj;
- class Object_merge_map;
- class Relocatable_relocs;
- struct Symbols_data;
- template<typename Stringpool_char>
- class Stringpool_template;
- // Data to pass from read_symbols() to add_symbols().
- struct Read_symbols_data
- {
- Read_symbols_data()
- : section_headers(NULL), section_names(NULL), symbols(NULL),
- symbol_names(NULL), versym(NULL), verdef(NULL), verneed(NULL)
- { }
- ~Read_symbols_data();
- // Section headers.
- File_view* section_headers;
- // Section names.
- File_view* section_names;
- // Size of section name data in bytes.
- section_size_type section_names_size;
- // Symbol data.
- File_view* symbols;
- // Size of symbol data in bytes.
- section_size_type symbols_size;
- // Offset of external symbols within symbol data. This structure
- // sometimes contains only external symbols, in which case this will
- // be zero. Sometimes it contains all symbols.
- section_offset_type external_symbols_offset;
- // Symbol names.
- File_view* symbol_names;
- // Size of symbol name data in bytes.
- section_size_type symbol_names_size;
- // Version information. This is only used on dynamic objects.
- // Version symbol data (from SHT_GNU_versym section).
- File_view* versym;
- section_size_type versym_size;
- // Version definition data (from SHT_GNU_verdef section).
- File_view* verdef;
- section_size_type verdef_size;
- unsigned int verdef_info;
- // Needed version data (from SHT_GNU_verneed section).
- File_view* verneed;
- section_size_type verneed_size;
- unsigned int verneed_info;
- };
- // Information used to print error messages.
- struct Symbol_location_info
- {
- std::string source_file;
- std::string enclosing_symbol_name;
- elfcpp::STT enclosing_symbol_type;
- };
- // Data about a single relocation section. This is read in
- // read_relocs and processed in scan_relocs.
- struct Section_relocs
- {
- Section_relocs()
- : contents(NULL)
- { }
- ~Section_relocs()
- { delete this->contents; }
- // Index of reloc section.
- unsigned int reloc_shndx;
- // Index of section that relocs apply to.
- unsigned int data_shndx;
- // Contents of reloc section.
- File_view* contents;
- // Reloc section type.
- unsigned int sh_type;
- // Number of reloc entries.
- size_t reloc_count;
- // Output section.
- Output_section* output_section;
- // Whether this section has special handling for offsets.
- bool needs_special_offset_handling;
- // Whether the data section is allocated (has the SHF_ALLOC flag set).
- bool is_data_section_allocated;
- };
- // Relocations in an object file. This is read in read_relocs and
- // processed in scan_relocs.
- struct Read_relocs_data
- {
- Read_relocs_data()
- : local_symbols(NULL)
- { }
- ~Read_relocs_data()
- { delete this->local_symbols; }
- typedef std::vector<Section_relocs> Relocs_list;
- // The relocations.
- Relocs_list relocs;
- // The local symbols.
- File_view* local_symbols;
- };
- // The Xindex class manages section indexes for objects with more than
- // 0xff00 sections.
- class Xindex
- {
- public:
- Xindex(int large_shndx_offset)
- : large_shndx_offset_(large_shndx_offset), symtab_xindex_()
- { }
- // Initialize the symtab_xindex_ array, given the object and the
- // section index of the symbol table to use.
- template<int size, bool big_endian>
- void
- initialize_symtab_xindex(Object*, unsigned int symtab_shndx);
- // Read in the symtab_xindex_ array, given its section index.
- // PSHDRS may optionally point to the section headers.
- template<int size, bool big_endian>
- void
- read_symtab_xindex(Object*, unsigned int xindex_shndx,
- const unsigned char* pshdrs);
- // Symbol SYMNDX in OBJECT has a section of SHN_XINDEX; return the
- // real section index.
- unsigned int
- sym_xindex_to_shndx(Object* object, unsigned int symndx);
- private:
- // The type of the array giving the real section index for symbols
- // whose st_shndx field holds SHN_XINDEX.
- typedef std::vector<unsigned int> Symtab_xindex;
- // Adjust a section index if necessary. This should only be called
- // for ordinary section indexes.
- unsigned int
- adjust_shndx(unsigned int shndx)
- {
- if (shndx >= elfcpp::SHN_LORESERVE)
- shndx += this->large_shndx_offset_;
- return shndx;
- }
- // Adjust to apply to large section indexes.
- int large_shndx_offset_;
- // The data from the SHT_SYMTAB_SHNDX section.
- Symtab_xindex symtab_xindex_;
- };
- // A GOT offset list. A symbol may have more than one GOT offset
- // (e.g., when mixing modules compiled with two different TLS models),
- // but will usually have at most one. GOT_TYPE identifies the type of
- // GOT entry; its values are specific to each target.
- class Got_offset_list
- {
- public:
- Got_offset_list()
- : got_type_(-1U), got_offset_(0), addend_(0), got_next_(NULL)
- { }
- Got_offset_list(unsigned int got_type, unsigned int got_offset,
- uint64_t addend)
- : got_type_(got_type), got_offset_(got_offset), addend_(addend),
- got_next_(NULL)
- { }
- ~Got_offset_list()
- {
- if (this->got_next_ != NULL)
- {
- delete this->got_next_;
- this->got_next_ = NULL;
- }
- }
- // Initialize the fields to their default values.
- void
- init()
- {
- this->got_type_ = -1U;
- this->got_offset_ = 0;
- this->addend_ = 0;
- this->got_next_ = NULL;
- }
- // Set the offset for the GOT entry of type GOT_TYPE.
- void
- set_offset(unsigned int got_type, unsigned int got_offset, uint64_t addend)
- {
- if (this->got_type_ == -1U)
- {
- this->got_type_ = got_type;
- this->got_offset_ = got_offset;
- this->addend_ = addend;
- }
- else
- {
- for (Got_offset_list* g = this; g != NULL; g = g->got_next_)
- {
- if (g->got_type_ == got_type && g->addend_ == addend)
- {
- g->got_offset_ = got_offset;
- return;
- }
- }
- Got_offset_list* g = new Got_offset_list(got_type, got_offset, addend);
- g->got_next_ = this->got_next_;
- this->got_next_ = g;
- }
- }
- // Return the offset for a GOT entry of type GOT_TYPE.
- unsigned int
- get_offset(unsigned int got_type, uint64_t addend) const
- {
- for (const Got_offset_list* g = this; g != NULL; g = g->got_next_)
- {
- if (g->got_type_ == got_type && g->addend_ == addend)
- return g->got_offset_;
- }
- return -1U;
- }
- // Return a pointer to the list, or NULL if the list is empty.
- const Got_offset_list*
- get_list() const
- {
- if (this->got_type_ == -1U)
- return NULL;
- return this;
- }
- // Abstract visitor class for iterating over GOT offsets.
- class Visitor
- {
- public:
- Visitor()
- { }
- virtual
- ~Visitor()
- { }
- virtual void
- visit(unsigned int, unsigned int, uint64_t) = 0;
- };
- // Loop over all GOT offset entries, calling a visitor class V for each.
- void
- for_all_got_offsets(Visitor* v) const
- {
- if (this->got_type_ == -1U)
- return;
- for (const Got_offset_list* g = this; g != NULL; g = g->got_next_)
- v->visit(g->got_type_, g->got_offset_, g->addend_);
- }
- private:
- unsigned int got_type_;
- unsigned int got_offset_;
- uint64_t addend_;
- Got_offset_list* got_next_;
- };
- // The Local_got_entry_key used to index the GOT offsets for local
- // non-TLS symbols, and tp-relative offsets for TLS symbols.
- class Local_got_entry_key
- {
- public:
- Local_got_entry_key(unsigned int symndx)
- : symndx_(symndx)
- {}
- // Whether this equals to another Local_got_entry_key.
- bool
- eq(const Local_got_entry_key& key) const
- {
- return this->symndx_ == key.symndx_;
- }
- // Compute a hash value for this using 64-bit FNV-1a hash.
- size_t
- hash_value() const
- {
- uint64_t h = 14695981039346656037ULL; // FNV offset basis.
- uint64_t prime = 1099511628211ULL;
- h = (h ^ static_cast<uint64_t>(this->symndx_)) * prime;
- return h;
- }
- // Functors for associative containers.
- struct equal_to
- {
- bool
- operator()(const Local_got_entry_key& key1,
- const Local_got_entry_key& key2) const
- { return key1.eq(key2); }
- };
- struct hash
- {
- size_t
- operator()(const Local_got_entry_key& key) const
- { return key.hash_value(); }
- };
- private:
- // The local symbol index.
- unsigned int symndx_;
- };
- // Type for mapping section index to uncompressed size and contents.
- struct Compressed_section_info
- {
- section_size_type size;
- elfcpp::Elf_Xword flag;
- uint64_t addralign;
- const unsigned char* contents;
- };
- typedef std::map<unsigned int, Compressed_section_info> Compressed_section_map;
- template<int size, bool big_endian>
- Compressed_section_map*
- build_compressed_section_map(const unsigned char* pshdrs, unsigned int shnum,
- const char* names, section_size_type names_size,
- Object* obj, bool decompress_if_needed);
- // Osabi represents the EI_OSABI field from the ELF header.
- class Osabi
- {
- public:
- Osabi(unsigned char ei_osabi)
- : ei_osabi_(static_cast<elfcpp::ELFOSABI>(ei_osabi))
- { }
- bool
- has_shf_retain(elfcpp::Elf_Xword sh_flags) const
- {
- switch (this->ei_osabi_)
- {
- case elfcpp::ELFOSABI_GNU:
- case elfcpp::ELFOSABI_FREEBSD:
- return (sh_flags & elfcpp::SHF_GNU_RETAIN) != 0;
- default:
- break;
- }
- return false;
- }
- elfcpp::Elf_Xword
- ignored_sh_flags() const
- {
- switch (this->ei_osabi_)
- {
- case elfcpp::ELFOSABI_GNU:
- case elfcpp::ELFOSABI_FREEBSD:
- return elfcpp::SHF_GNU_RETAIN;
- default:
- break;
- }
- return 0;
- }
- private:
- elfcpp::ELFOSABI ei_osabi_;
- };
- // Object is an abstract base class which represents either a 32-bit
- // or a 64-bit input object. This can be a regular object file
- // (ET_REL) or a shared object (ET_DYN).
- class Object
- {
- public:
- typedef std::vector<Symbol*> Symbols;
- // NAME is the name of the object as we would report it to the user
- // (e.g., libfoo.a(bar.o) if this is in an archive. INPUT_FILE is
- // used to read the file. OFFSET is the offset within the input
- // file--0 for a .o or .so file, something else for a .a file.
- Object(const std::string& name, Input_file* input_file, bool is_dynamic,
- off_t offset = 0)
- : name_(name), input_file_(input_file), offset_(offset), shnum_(-1U),
- is_dynamic_(is_dynamic), is_needed_(false), uses_split_stack_(false),
- has_no_split_stack_(false), no_export_(false),
- is_in_system_directory_(false), as_needed_(false), xindex_(NULL),
- compressed_sections_(NULL)
- {
- if (input_file != NULL)
- {
- input_file->file().add_object();
- this->is_in_system_directory_ = input_file->is_in_system_directory();
- this->as_needed_ = input_file->options().as_needed();
- }
- }
- virtual ~Object()
- {
- if (this->input_file_ != NULL)
- this->input_file_->file().remove_object();
- }
- // Return the name of the object as we would report it to the user.
- const std::string&
- name() const
- { return this->name_; }
- // Get the offset into the file.
- off_t
- offset() const
- { return this->offset_; }
- // Return whether this is a dynamic object.
- bool
- is_dynamic() const
- { return this->is_dynamic_; }
- // Return the word size of the object file.
- virtual int elfsize() const = 0;
- // Return TRUE if this is a big-endian object file.
- virtual bool is_big_endian() const = 0;
- // Return whether this object is needed--true if it is a dynamic
- // object which defines some symbol referenced by a regular object.
- // We keep the flag here rather than in Dynobj for convenience when
- // setting it.
- bool
- is_needed() const
- { return this->is_needed_; }
- // Record that this object is needed.
- void
- set_is_needed()
- { this->is_needed_ = true; }
- // Return whether this object was compiled with -fsplit-stack.
- bool
- uses_split_stack() const
- { return this->uses_split_stack_; }
- // Return whether this object contains any functions compiled with
- // the no_split_stack attribute.
- bool
- has_no_split_stack() const
- { return this->has_no_split_stack_; }
- // Returns NULL for Objects that are not dynamic objects. This method
- // is overridden in the Dynobj class.
- Dynobj*
- dynobj()
- { return this->do_dynobj(); }
- // Returns NULL for Objects that are not plugin objects. This method
- // is overridden in the Pluginobj class.
- Pluginobj*
- pluginobj()
- { return this->do_pluginobj(); }
- // Get the file. We pass on const-ness.
- Input_file*
- input_file()
- {
- gold_assert(this->input_file_ != NULL);
- return this->input_file_;
- }
- const Input_file*
- input_file() const
- {
- gold_assert(this->input_file_ != NULL);
- return this->input_file_;
- }
- // Lock the underlying file.
- void
- lock(const Task* t)
- {
- if (this->input_file_ != NULL)
- this->input_file_->file().lock(t);
- }
- // Unlock the underlying file.
- void
- unlock(const Task* t)
- {
- if (this->input_file_ != NULL)
- this->input_file()->file().unlock(t);
- }
- // Return whether the underlying file is locked.
- bool
- is_locked() const
- { return this->input_file_ != NULL && this->input_file_->file().is_locked(); }
- // Return the token, so that the task can be queued.
- Task_token*
- token()
- {
- if (this->input_file_ == NULL)
- return NULL;
- return this->input_file()->file().token();
- }
- // Release the underlying file.
- void
- release()
- {
- if (this->input_file_ != NULL)
- this->input_file()->file().release();
- }
- // Return whether we should just read symbols from this file.
- bool
- just_symbols() const
- { return this->input_file()->just_symbols(); }
- // Return whether this is an incremental object.
- bool
- is_incremental() const
- { return this->do_is_incremental(); }
- // Return the last modified time of the file.
- Timespec
- get_mtime()
- { return this->do_get_mtime(); }
- // Get the number of sections.
- unsigned int
- shnum() const
- { return this->shnum_; }
- // Return a view of the contents of a section. Set *PLEN to the
- // size. CACHE is a hint as in File_read::get_view.
- const unsigned char*
- section_contents(unsigned int shndx, section_size_type* plen, bool cache);
- // Adjust a symbol's section index as needed. SYMNDX is the index
- // of the symbol and SHNDX is the symbol's section from
- // get_st_shndx. This returns the section index. It sets
- // *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,
- elfcpp::Elf_Xword* palign = NULL) 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;
- if (palign != NULL)
- *palign = p->second.addralign;
- 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, uint64_t* palign = NULL);
- // 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 there is a GOT entry of type GOT_TYPE for the
- // local symbol SYMNDX with given ADDEND.
- bool
- local_has_got_offset(unsigned int symndx, unsigned int got_type,
- uint64_t addend = 0) const
- { return this->do_local_has_got_offset(symndx, got_type, addend); }
- // Return the GOT offset of the GOT entry with type GOT_TYPE for the
- // local symbol SYMNDX with given ADDEND. It is an error to call
- // this function if the symbol does not have such a GOT entry.
- unsigned int
- local_got_offset(unsigned int symndx, unsigned int got_type,
- uint64_t addend = 0) const
- { return this->do_local_got_offset(symndx, got_type, addend); }
- // Set the GOT offset for a GOT entry with type GOT_TYPE for the
- // local symbol SYMNDX with ADDEND to GOT_OFFSET. Create such an
- // entry if none exists.
- void
- set_local_got_offset(unsigned int symndx, unsigned int got_type,
- unsigned int got_offset, uint64_t addend = 0)
- { 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);
- 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, addend) != -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);
- 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, addend);
- 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);
- 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, addend);
- else
- {
- Got_offset_list* g = new Got_offset_list(got_type, got_offset, addend);
- 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 EI_OSABI.
- const Osabi&
- osabi() const
- { return this->osabi_; }
- // 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, std::string& section_name,
- bool* found) const;
- // Look for a kept section corresponding to the given discarded section,
- // and return its object file.
- Relobj*
- find_kept_section_object(unsigned int shndx, unsigned int* symndx_p) const;
- // Return the name of symbol SYMNDX.
- const char*
- get_symbol_name(unsigned int symndx);
- // 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;
- typedef elfcpp::Shdr_write<size, big_endian> Shdr_write;
- // 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(uint64_t a_sh_size, Kept_section* a_kept_section,
- unsigned int a_symndx, bool a_is_comdat)
- : sh_size(a_sh_size), kept_section(a_kept_section),
- symndx (a_symndx), is_comdat(a_is_comdat)
- { }
- uint64_t sh_size; // Section size
- Kept_section* kept_section; // Kept section info
- unsigned int symndx; // Index of key symbol
- bool is_comdat; // True if comdat group, false if linkonce
- };
- 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 sh_type,
- 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);
- // Layout an input .note.gnu.property section.
- void
- layout_gnu_property_section(Layout* layout, unsigned int shndx);
- // 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, bool is_comdat,
- unsigned int symndx, uint64_t sh_size,
- Kept_section* kept_section)
- {
- Kept_comdat_section kept(sh_size, kept_section, symndx, is_comdat);
- 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, bool* is_comdat,
- unsigned int *symndx, uint64_t* sh_size,
- Kept_section** kept_section) const
- {
- typename Kept_comdat_section_table::const_iterator p =
- this->kept_comdat_sections_.find(shndx);
- if (p == this->kept_comdat_sections_.end())
- return false;
- *is_comdat = p->second.is_comdat;
- *symndx = p->second.symndx;
- *sh_size = p->second.sh_size;
- *kept_section = p->second.kept_section;
- 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,
- unsigned int sh_type,
- const unsigned char* pshdr,
- unsigned int reloc_shndx, unsigned int reloc_type)
- : name_(name), shndx_(shndx), reloc_shndx_(reloc_shndx),
- reloc_type_(reloc_type)
- {
- typename This::Shdr_write shdr(this->shdr_data_);
- memcpy(this->shdr_data_, pshdr, shdr_size);
- shdr.put_sh_type(sh_type);
- }
- std::string name_;
- unsigned int shndx_;
- 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_;
- // The EI_OSABI.
- const Osabi osabi_;
- // 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_;
- // 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)
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