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Diffstat (limited to 'gold/symtab.h')
| -rw-r--r-- | gold/symtab.h | 1050 |
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diff --git a/gold/symtab.h b/gold/symtab.h new file mode 100644 index 000000000000..66e98bc6d25e --- /dev/null +++ b/gold/symtab.h @@ -0,0 +1,1050 @@ +// symtab.h -- the gold symbol table -*- C++ -*- + +// Symbol_table +// The symbol table. + +#include <string> +#include <utility> +#include <vector> + +#include "elfcpp.h" +#include "stringpool.h" +#include "object.h" + +#ifndef GOLD_SYMTAB_H +#define GOLD_SYMTAB_H + +namespace gold +{ + +class Object; +class Relobj; +template<int size, bool big_endian> +class Sized_relobj; +class Dynobj; +template<int size, bool big_endian> +class Sized_dynobj; +class Versions; +class Output_data; +class Output_section; +class Output_segment; +class Output_file; +class Target; + +// The base class of an entry in the symbol table. The symbol table +// can have a lot of entries, so we don't want this class to big. +// Size dependent fields can be found in the template class +// Sized_symbol. Targets may support their own derived classes. + +class Symbol +{ + public: + // Because we want the class to be small, we don't use any virtual + // functions. But because symbols can be defined in different + // places, we need to classify them. This enum is the different + // sources of symbols we support. + enum Source + { + // Symbol defined in a relocatable or dynamic input file--this is + // the most common case. + FROM_OBJECT, + // Symbol defined in an Output_data, a special section created by + // the target. + IN_OUTPUT_DATA, + // Symbol defined in an Output_segment, with no associated + // section. + IN_OUTPUT_SEGMENT, + // Symbol value is constant. + CONSTANT + }; + + // When the source is IN_OUTPUT_SEGMENT, we need to describe what + // the offset means. + enum Segment_offset_base + { + // From the start of the segment. + SEGMENT_START, + // From the end of the segment. + SEGMENT_END, + // From the filesz of the segment--i.e., after the loaded bytes + // but before the bytes which are allocated but zeroed. + SEGMENT_BSS + }; + + // Return the symbol name. + const char* + name() const + { return this->name_; } + + // Return the symbol version. This will return NULL for an + // unversioned symbol. + const char* + version() const + { return this->version_; } + + // Return the symbol source. + Source + source() const + { return this->source_; } + + // Return the object with which this symbol is associated. + Object* + object() const + { + gold_assert(this->source_ == FROM_OBJECT); + return this->u_.from_object.object; + } + + // Return the index of the section in the input relocatable or + // dynamic object file. + unsigned int + shndx() const + { + gold_assert(this->source_ == FROM_OBJECT); + return this->u_.from_object.shndx; + } + + // Return the output data section with which this symbol is + // associated, if the symbol was specially defined with respect to + // an output data section. + Output_data* + output_data() const + { + gold_assert(this->source_ == IN_OUTPUT_DATA); + return this->u_.in_output_data.output_data; + } + + // If this symbol was defined with respect to an output data + // section, return whether the value is an offset from end. + bool + offset_is_from_end() const + { + gold_assert(this->source_ == IN_OUTPUT_DATA); + return this->u_.in_output_data.offset_is_from_end; + } + + // Return the output segment with which this symbol is associated, + // if the symbol was specially defined with respect to an output + // segment. + Output_segment* + output_segment() const + { + gold_assert(this->source_ == IN_OUTPUT_SEGMENT); + return this->u_.in_output_segment.output_segment; + } + + // If this symbol was defined with respect to an output segment, + // return the offset base. + Segment_offset_base + offset_base() const + { + gold_assert(this->source_ == IN_OUTPUT_SEGMENT); + return this->u_.in_output_segment.offset_base; + } + + // Return the symbol binding. + elfcpp::STB + binding() const + { return this->binding_; } + + // Return the symbol type. + elfcpp::STT + type() const + { return this->type_; } + + // Return the symbol visibility. + elfcpp::STV + visibility() const + { return this->visibility_; } + + // Return the non-visibility part of the st_other field. + unsigned char + nonvis() const + { return this->nonvis_; } + + // Return whether this symbol is a forwarder. This will never be + // true of a symbol found in the hash table, but may be true of + // symbol pointers attached to object files. + bool + is_forwarder() const + { return this->is_forwarder_; } + + // Mark this symbol as a forwarder. + void + set_forwarder() + { this->is_forwarder_ = true; } + + // Return whether this symbol needs an entry in the dynamic symbol + // table. + bool + needs_dynsym_entry() const + { return this->needs_dynsym_entry_; } + + // Mark this symbol as needing an entry in the dynamic symbol table. + void + set_needs_dynsym_entry() + { this->needs_dynsym_entry_ = true; } + + // Return whether this symbol has been seen in a regular object. + bool + in_reg() const + { return this->in_reg_; } + + // Mark this symbol as having been seen in a regular object. + void + set_in_reg() + { this->in_reg_ = true; } + + // Mark this symbol as having been seen in a dynamic object. + void + set_in_dyn() + { this->in_dyn_ = true; } + + // Return the index of this symbol in the output file symbol table. + // A value of -1U means that this symbol is not going into the + // output file. This starts out as zero, and is set to a non-zero + // value by Symbol_table::finalize. It is an error to ask for the + // symbol table index before it has been set. + unsigned int + symtab_index() const + { + gold_assert(this->symtab_index_ != 0); + return this->symtab_index_; + } + + // Set the index of the symbol in the output file symbol table. + void + set_symtab_index(unsigned int index) + { + gold_assert(index != 0); + this->symtab_index_ = index; + } + + // Return whether this symbol already has an index in the output + // file symbol table. + bool + has_symtab_index() const + { return this->symtab_index_ != 0; } + + // Return the index of this symbol in the dynamic symbol table. A + // value of -1U means that this symbol is not going into the dynamic + // symbol table. This starts out as zero, and is set to a non-zero + // during Layout::finalize. It is an error to ask for the dynamic + // symbol table index before it has been set. + unsigned int + dynsym_index() const + { + gold_assert(this->dynsym_index_ != 0); + return this->dynsym_index_; + } + + // Set the index of the symbol in the dynamic symbol table. + void + set_dynsym_index(unsigned int index) + { + gold_assert(index != 0); + this->dynsym_index_ = index; + } + + // Return whether this symbol already has an index in the dynamic + // symbol table. + bool + has_dynsym_index() const + { return this->dynsym_index_ != 0; } + + // Return whether this symbol has an entry in the GOT section. + bool + has_got_offset() const + { return this->has_got_offset_; } + + // Return the offset into the GOT section of this symbol. + unsigned int + got_offset() const + { + gold_assert(this->has_got_offset()); + return this->got_offset_; + } + + // Set the GOT offset of this symbol. + void + set_got_offset(unsigned int got_offset) + { + this->has_got_offset_ = true; + this->got_offset_ = got_offset; + } + + // Return whether this symbol has an entry in the PLT section. + bool + has_plt_offset() const + { return this->has_plt_offset_; } + + // Return the offset into the PLT section of this symbol. + unsigned int + plt_offset() const + { + gold_assert(this->has_plt_offset()); + return this->plt_offset_; + } + + // Set the PLT offset of this symbol. + void + set_plt_offset(unsigned int plt_offset) + { + this->has_plt_offset_ = true; + this->plt_offset_ = plt_offset; + } + + // Return true if the final value of this symbol is known at link + // time. + bool + final_value_is_known(const General_options* options) const + { + if (options->is_shared()) + return false; + return this->source_ != FROM_OBJECT || !this->object()->is_dynamic(); + } + + // Return whether this is a defined symbol (not undefined or + // common). + bool + is_defined() const + { + return (this->source_ != FROM_OBJECT + || (this->shndx() != elfcpp::SHN_UNDEF + && this->shndx() != elfcpp::SHN_COMMON)); + } + + // Return true if this symbol is from a dynamic object. + bool + is_from_dynobj() const + { + return this->source_ == FROM_OBJECT && this->object()->is_dynamic(); + } + + // Return whether this is an undefined symbol. + bool + is_undefined() const + { + return this->source_ == FROM_OBJECT && this->shndx() == elfcpp::SHN_UNDEF; + } + + // Return whether this is a common symbol. + bool + is_common() const + { + return (this->source_ == FROM_OBJECT + && (this->shndx() == elfcpp::SHN_COMMON + || this->type_ == elfcpp::STT_COMMON)); + } + + // Return whether there should be a warning for references to this + // symbol. + bool + has_warning() const + { return this->has_warning_; } + + // Mark this symbol as having a warning. + void + set_has_warning() + { this->has_warning_ = true; } + + protected: + // Instances of this class should always be created at a specific + // size. + Symbol() + { memset(this, 0, sizeof *this); } + + // Initialize the general fields. + void + init_fields(const char* name, const char* version, + elfcpp::STT type, elfcpp::STB binding, + elfcpp::STV visibility, unsigned char nonvis); + + // Initialize fields from an ELF symbol in OBJECT. + template<int size, bool big_endian> + void + init_base(const char *name, const char* version, Object* object, + const elfcpp::Sym<size, big_endian>&); + + // Initialize fields for an Output_data. + void + init_base(const char* name, Output_data*, elfcpp::STT, elfcpp::STB, + elfcpp::STV, unsigned char nonvis, bool offset_is_from_end); + + // Initialize fields for an Output_segment. + void + init_base(const char* name, Output_segment* os, elfcpp::STT type, + elfcpp::STB binding, elfcpp::STV visibility, + unsigned char nonvis, Segment_offset_base offset_base); + + // Initialize fields for a constant. + void + init_base(const char* name, elfcpp::STT type, elfcpp::STB binding, + elfcpp::STV visibility, unsigned char nonvis); + + // Override existing symbol. + template<int size, bool big_endian> + void + override_base(const elfcpp::Sym<size, big_endian>&, Object* object, + const char* version); + + private: + Symbol(const Symbol&); + Symbol& operator=(const Symbol&); + + // Symbol name (expected to point into a Stringpool). + const char* name_; + // Symbol version (expected to point into a Stringpool). This may + // be NULL. + const char* version_; + + union + { + // This struct is used if SOURCE_ == FROM_OBJECT. + struct + { + // Object in which symbol is defined, or in which it was first + // seen. + Object* object; + // Section number in object_ in which symbol is defined. + unsigned int shndx; + } from_object; + + // This struct is used if SOURCE_ == IN_OUTPUT_DATA. + struct + { + // Output_data in which symbol is defined. Before + // Layout::finalize the symbol's value is an offset within the + // Output_data. + Output_data* output_data; + // True if the offset is from the end, false if the offset is + // from the beginning. + bool offset_is_from_end; + } in_output_data; + + // This struct is used if SOURCE_ == IN_OUTPUT_SEGMENT. + struct + { + // Output_segment in which the symbol is defined. Before + // Layout::finalize the symbol's value is an offset. + Output_segment* output_segment; + // The base to use for the offset before Layout::finalize. + Segment_offset_base offset_base; + } in_output_segment; + } u_; + + // The index of this symbol in the output file. If the symbol is + // not going into the output file, this value is -1U. This field + // starts as always holding zero. It is set to a non-zero value by + // Symbol_table::finalize. + unsigned int symtab_index_; + + // The index of this symbol in the dynamic symbol table. If the + // symbol is not going into the dynamic symbol table, this value is + // -1U. This field starts as always holding zero. It is set to a + // non-zero value during Layout::finalize. + unsigned int dynsym_index_; + + // If this symbol has an entry in the GOT section (has_got_offset_ + // is true), this is the offset from the start of the GOT section. + unsigned int got_offset_; + + // If this symbol has an entry in the PLT section (has_plt_offset_ + // is true), then this is the offset from the start of the PLT + // section. + unsigned int plt_offset_; + + // Symbol type. + elfcpp::STT type_ : 4; + // Symbol binding. + elfcpp::STB binding_ : 4; + // Symbol visibility. + elfcpp::STV visibility_ : 2; + // Rest of symbol st_other field. + unsigned int nonvis_ : 6; + // The type of symbol. + Source source_ : 3; + // True if this symbol always requires special target-specific + // handling. + bool is_target_special_ : 1; + // True if this is the default version of the symbol. + bool is_def_ : 1; + // True if this symbol really forwards to another symbol. This is + // used when we discover after the fact that two different entries + // in the hash table really refer to the same symbol. This will + // never be set for a symbol found in the hash table, but may be set + // for a symbol found in the list of symbols attached to an Object. + // It forwards to the symbol found in the forwarders_ map of + // Symbol_table. + bool is_forwarder_ : 1; + // True if this symbol needs to be in the dynamic symbol table. + bool needs_dynsym_entry_ : 1; + // True if we've seen this symbol in a regular object. + bool in_reg_ : 1; + // True if we've seen this symbol in a dynamic object. + bool in_dyn_ : 1; + // True if the symbol has an entry in the GOT section. + bool has_got_offset_ : 1; + // True if the symbol has an entry in the PLT section. + bool has_plt_offset_ : 1; + // True if there is a warning for this symbol. + bool has_warning_ : 1; +}; + +// The parts of a symbol which are size specific. Using a template +// derived class like this helps us use less space on a 32-bit system. + +template<int size> +class Sized_symbol : public Symbol +{ + public: + typedef typename elfcpp::Elf_types<size>::Elf_Addr Value_type; + typedef typename elfcpp::Elf_types<size>::Elf_WXword Size_type; + + Sized_symbol() + { } + + // Initialize fields from an ELF symbol in OBJECT. + template<bool big_endian> + void + init(const char *name, const char* version, Object* object, + const elfcpp::Sym<size, big_endian>&); + + // Initialize fields for an Output_data. + void + init(const char* name, Output_data*, Value_type value, Size_type symsize, + elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, + bool offset_is_from_end); + + // Initialize fields for an Output_segment. + void + init(const char* name, Output_segment*, Value_type value, Size_type symsize, + elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis, + Segment_offset_base offset_base); + + // Initialize fields for a constant. + void + init(const char* name, Value_type value, Size_type symsize, + elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis); + + // Override existing symbol. + template<bool big_endian> + void + override(const elfcpp::Sym<size, big_endian>&, Object* object, + const char* version); + + // Return the symbol's value. + Value_type + value() const + { return this->value_; } + + // Return the symbol's size (we can't call this 'size' because that + // is a template parameter). + Size_type + symsize() const + { return this->symsize_; } + + // Set the symbol size. This is used when resolving common symbols. + void + set_symsize(Size_type symsize) + { this->symsize_ = symsize; } + + // Set the symbol value. This is called when we store the final + // values of the symbols into the symbol table. + void + set_value(Value_type value) + { this->value_ = value; } + + private: + Sized_symbol(const Sized_symbol&); + Sized_symbol& operator=(const Sized_symbol&); + + // Symbol value. Before Layout::finalize this is the offset in the + // input section. This is set to the final value during + // Layout::finalize. + Value_type value_; + // Symbol size. + Size_type symsize_; +}; + +// A struct describing a symbol defined by the linker, where the value +// of the symbol is defined based on an output section. This is used +// for symbols defined by the linker, like "_init_array_start". + +struct Define_symbol_in_section +{ + // The symbol name. + const char* name; + // The name of the output section with which this symbol should be + // associated. If there is no output section with that name, the + // symbol will be defined as zero. + const char* output_section; + // The offset of the symbol within the output section. This is an + // offset from the start of the output section, unless start_at_end + // is true, in which case this is an offset from the end of the + // output section. + uint64_t value; + // The size of the symbol. + uint64_t size; + // The symbol type. + elfcpp::STT type; + // The symbol binding. + elfcpp::STB binding; + // The symbol visibility. + elfcpp::STV visibility; + // The rest of the st_other field. + unsigned char nonvis; + // If true, the value field is an offset from the end of the output + // section. + bool offset_is_from_end; + // If true, this symbol is defined only if we see a reference to it. + bool only_if_ref; +}; + +// A struct describing a symbol defined by the linker, where the value +// of the symbol is defined based on a segment. This is used for +// symbols defined by the linker, like "_end". We describe the +// segment with which the symbol should be associated by its +// characteristics. If no segment meets these characteristics, the +// symbol will be defined as zero. If there is more than one segment +// which meets these characteristics, we will use the first one. + +struct Define_symbol_in_segment +{ + // The symbol name. + const char* name; + // The segment type where the symbol should be defined, typically + // PT_LOAD. + elfcpp::PT segment_type; + // Bitmask of segment flags which must be set. + elfcpp::PF segment_flags_set; + // Bitmask of segment flags which must be clear. + elfcpp::PF segment_flags_clear; + // The offset of the symbol within the segment. The offset is + // calculated from the position set by offset_base. + uint64_t value; + // The size of the symbol. + uint64_t size; + // The symbol type. + elfcpp::STT type; + // The symbol binding. + elfcpp::STB binding; + // The symbol visibility. + elfcpp::STV visibility; + // The rest of the st_other field. + unsigned char nonvis; + // The base from which we compute the offset. + Symbol::Segment_offset_base offset_base; + // If true, this symbol is defined only if we see a reference to it. + bool only_if_ref; +}; + +// This class manages warnings. Warnings are a GNU extension. When +// we see a section named .gnu.warning.SYM in an object file, and if +// we wind using the definition of SYM from that object file, then we +// will issue a warning for any relocation against SYM from a +// different object file. The text of the warning is the contents of +// the section. This is not precisely the definition used by the old +// GNU linker; the old GNU linker treated an occurrence of +// .gnu.warning.SYM as defining a warning symbol. A warning symbol +// would trigger a warning on any reference. However, it was +// inconsistent in that a warning in a dynamic object only triggered +// if there was no definition in a regular object. This linker is +// different in that we only issue a warning if we use the symbol +// definition from the same object file as the warning section. + +class Warnings +{ + public: + Warnings() + : warnings_() + { } + + // Add a warning for symbol NAME in section SHNDX in object OBJ. + void + add_warning(Symbol_table* symtab, const char* name, Object* obj, + unsigned int shndx); + + // For each symbol for which we should give a warning, make a note + // on the symbol. + void + note_warnings(Symbol_table* symtab); + + // Issue a warning for a reference to SYM at LOCATION. + void + issue_warning(const Symbol* sym, const std::string& location) const; + + private: + Warnings(const Warnings&); + Warnings& operator=(const Warnings&); + + // What we need to know to get the warning text. + struct Warning_location + { + // The object the warning is in. + Object* object; + // The index of the warning section. + unsigned int shndx; + // The warning text if we have already loaded it. + std::string text; + + Warning_location() + : object(NULL), shndx(0), text() + { } + + void + set(Object* o, unsigned int s) + { + this->object = o; + this->shndx = s; + } + + void + set_text(const char* t, off_t l) + { this->text.assign(t, l); } + }; + + // A mapping from warning symbol names (canonicalized in + // Symbol_table's namepool_ field) to + typedef Unordered_map<const char*, Warning_location> Warning_table; + + Warning_table warnings_; +}; + +// The main linker symbol table. + +class Symbol_table +{ + public: + Symbol_table(); + + ~Symbol_table(); + + // Add COUNT external symbols from the relocatable object RELOBJ to + // the symbol table. SYMS is the symbols, SYM_NAMES is their names, + // SYM_NAME_SIZE is the size of SYM_NAMES. This sets SYMPOINTERS to + // point to the symbols in the symbol table. + template<int size, bool big_endian> + void + add_from_relobj(Sized_relobj<size, big_endian>* relobj, + const unsigned char* syms, size_t count, + const char* sym_names, size_t sym_name_size, + Symbol** sympointers); + + // Add COUNT dynamic symbols from the dynamic object DYNOBJ to the + // symbol table. SYMS is the symbols. SYM_NAMES is their names. + // SYM_NAME_SIZE is the size of SYM_NAMES. The other parameters are + // symbol version data. + template<int size, bool big_endian> + void + add_from_dynobj(Sized_dynobj<size, big_endian>* dynobj, + const unsigned char* syms, size_t count, + const char* sym_names, size_t sym_name_size, + const unsigned char* versym, size_t versym_size, + const std::vector<const char*>*); + + // Define a special symbol based on an Output_data. It is a + // multiple definition error if this symbol is already defined. + Symbol* + define_in_output_data(const Target*, const char* name, const char* version, + Output_data*, uint64_t value, uint64_t symsize, + elfcpp::STT type, elfcpp::STB binding, + elfcpp::STV visibility, unsigned char nonvis, + bool offset_is_from_end, bool only_if_ref); + + // Define a special symbol based on an Output_segment. It is a + // multiple definition error if this symbol is already defined. + Symbol* + define_in_output_segment(const Target*, const char* name, + const char* version, Output_segment*, + uint64_t value, uint64_t symsize, + elfcpp::STT type, elfcpp::STB binding, + elfcpp::STV visibility, unsigned char nonvis, + Symbol::Segment_offset_base, bool only_if_ref); + + // Define a special symbol with a constant value. It is a multiple + // definition error if this symbol is already defined. + Symbol* + define_as_constant(const Target*, const char* name, const char* version, + uint64_t value, uint64_t symsize, elfcpp::STT type, + elfcpp::STB binding, elfcpp::STV visibility, + unsigned char nonvis, bool only_if_ref); + + // Define a set of symbols in output sections. + void + define_symbols(const Layout*, const Target*, int count, + const Define_symbol_in_section*); + + // Define a set of symbols in output segments. + void + define_symbols(const Layout*, const Target*, int count, + const Define_symbol_in_segment*); + + // Look up a symbol. + Symbol* + lookup(const char*, const char* version = NULL) const; + + // Return the real symbol associated with the forwarder symbol FROM. + Symbol* + resolve_forwards(const Symbol* from) const; + + // Return the bitsize (32 or 64) of the symbols in the table. + int + get_size() const + { return this->size_; } + + // Return the sized version of a symbol in this table. + template<int size> + Sized_symbol<size>* + get_sized_symbol(Symbol* ACCEPT_SIZE) const; + + template<int size> + const Sized_symbol<size>* + get_sized_symbol(const Symbol* ACCEPT_SIZE) const; + + // Return the count of undefined symbols seen. + int + saw_undefined() const + { return this->saw_undefined_; } + + // Allocate the common symbols + void + allocate_commons(const General_options&, Layout*); + + // Add a warning for symbol NAME in section SHNDX in object OBJ. + void + add_warning(const char* name, Object* obj, unsigned int shndx) + { this->warnings_.add_warning(this, name, obj, shndx); } + + // Canonicalize a symbol name for use in the hash table. + const char* + canonicalize_name(const char* name) + { return this->namepool_.add(name, NULL); } + + // Possibly issue a warning for a reference to SYM at LOCATION which + // is in OBJ. + void + issue_warning(const Symbol* sym, const std::string& location) const + { this->warnings_.issue_warning(sym, location); } + + // Set the dynamic symbol indexes. INDEX is the index of the first + // global dynamic symbol. Pointers to the symbols are stored into + // the vector. The names are stored into the Stringpool. This + // returns an updated dynamic symbol index. + unsigned int + set_dynsym_indexes(const General_options*, const Target*, unsigned int index, + std::vector<Symbol*>*, Stringpool*, Versions*); + + // Finalize the symbol table after we have set the final addresses + // of all the input sections. This sets the final symbol indexes, + // values and adds the names to *POOL. INDEX is the index of the + // first global symbol. OFF is the file offset of the global symbol + // table, DYNOFF is the offset of the globals in the dynamic symbol + // table, DYN_GLOBAL_INDEX is the index of the first global dynamic + // symbol, and DYNCOUNT is the number of global dynamic symbols. + // This records the parameters, and returns the new file offset. + off_t + finalize(unsigned int index, off_t off, off_t dynoff, + size_t dyn_global_index, size_t dyncount, Stringpool* pool); + + // Write out the global symbols. + void + write_globals(const Target*, const Stringpool*, const Stringpool*, + Output_file*) const; + + // Write out a section symbol. Return the updated offset. + void + write_section_symbol(const Target*, const Output_section*, Output_file*, + off_t) const; + + private: + Symbol_table(const Symbol_table&); + Symbol_table& operator=(const Symbol_table&); + + // Set the size (32 or 64) of the symbols in the table. + void + set_size(int size) + { this->size_ = size; } + + // Make FROM a forwarder symbol to TO. + void + make_forwarder(Symbol* from, Symbol* to); + + // Add a symbol. + template<int size, bool big_endian> + Symbol* + add_from_object(Object*, const char *name, Stringpool::Key name_key, + const char *version, Stringpool::Key version_key, + bool def, const elfcpp::Sym<size, big_endian>& sym); + + // Resolve symbols. + template<int size, bool big_endian> + static void + resolve(Sized_symbol<size>* to, + const elfcpp::Sym<size, big_endian>& sym, + Object*, const char* version); + + template<int size, bool big_endian> + static void + resolve(Sized_symbol<size>* to, const Sized_symbol<size>* from, + const char* version ACCEPT_SIZE_ENDIAN); + + // Define a special symbol. + template<int size, bool big_endian> + Sized_symbol<size>* + define_special_symbol(const Target* target, const char* name, + const char* version, bool only_if_ref + ACCEPT_SIZE_ENDIAN); + + // Define a symbol in an Output_data, sized version. + template<int size> + Sized_symbol<size>* + do_define_in_output_data(const Target*, const char* name, + const char* version, Output_data*, + typename elfcpp::Elf_types<size>::Elf_Addr value, + typename elfcpp::Elf_types<size>::Elf_WXword ssize, + elfcpp::STT type, elfcpp::STB binding, + elfcpp::STV visibility, unsigned char nonvis, + bool offset_is_from_end, bool only_if_ref); + + // Define a symbol in an Output_segment, sized version. + template<int size> + Sized_symbol<size>* + do_define_in_output_segment( + const Target*, const char* name, const char* version, Output_segment* os, + typename elfcpp::Elf_types<size>::Elf_Addr value, + typename elfcpp::Elf_types<size>::Elf_WXword ssize, + elfcpp::STT type, elfcpp::STB binding, + elfcpp::STV visibility, unsigned char nonvis, + Symbol::Segment_offset_base offset_base, bool only_if_ref); + + // Define a symbol as a constant, sized version. + template<int size> + Sized_symbol<size>* + do_define_as_constant( + const Target*, const char* name, const char* version, + typename elfcpp::Elf_types<size>::Elf_Addr value, + typename elfcpp::Elf_types<size>::Elf_WXword ssize, + elfcpp::STT type, elfcpp::STB binding, + elfcpp::STV visibility, unsigned char nonvis, + bool only_if_ref); + + // Allocate the common symbols, sized version. + template<int size> + void + do_allocate_commons(const General_options&, Layout*); + + // Finalize symbols specialized for size. + template<int size> + off_t + sized_finalize(unsigned int, off_t, Stringpool*); + + // Write globals specialized for size and endianness. + template<int size, bool big_endian> + void + sized_write_globals(const Target*, const Stringpool*, const Stringpool*, + Output_file*) const; + + // Write out a symbol to P. + template<int size, bool big_endian> + void + sized_write_symbol(Sized_symbol<size>*, unsigned int shndx, + const Stringpool*, unsigned char* p + ACCEPT_SIZE_ENDIAN) const; + + // Write out a section symbol, specialized for size and endianness. + template<int size, bool big_endian> + void + sized_write_section_symbol(const Output_section*, Output_file*, off_t) const; + + // The type of the symbol hash table. + + typedef std::pair<Stringpool::Key, Stringpool::Key> Symbol_table_key; + + struct Symbol_table_hash + { + size_t + operator()(const Symbol_table_key&) const; + }; + + struct Symbol_table_eq + { + bool + operator()(const Symbol_table_key&, const Symbol_table_key&) const; + }; + + typedef Unordered_map<Symbol_table_key, Symbol*, Symbol_table_hash, + Symbol_table_eq> Symbol_table_type; + + // The type of the list of common symbols. + + typedef std::vector<Symbol*> Commons_type; + + // The size of the symbols in the symbol table (32 or 64). + int size_; + + // We increment this every time we see a new undefined symbol, for + // use in archive groups. + int saw_undefined_; + + // The index of the first global symbol in the output file. + unsigned int first_global_index_; + + // The file offset within the output symtab section where we should + // write the table. + off_t offset_; + + // The number of global symbols we want to write out. + size_t output_count_; + + // The file offset of the global dynamic symbols, or 0 if none. + off_t dynamic_offset_; + + // The index of the first global dynamic symbol. + unsigned int first_dynamic_global_index_; + + // The number of global dynamic symbols, or 0 if none. + off_t dynamic_count_; + + // The symbol hash table. + Symbol_table_type table_; + + // A pool of symbol names. This is used for all global symbols. + // Entries in the hash table point into this pool. + Stringpool namepool_; + + // Forwarding symbols. + Unordered_map<const Symbol*, Symbol*> forwarders_; + + // We don't expect there to be very many common symbols, so we keep + // a list of them. When we find a common symbol we add it to this + // list. It is possible that by the time we process the list the + // symbol is no longer a common symbol. It may also have become a + // forwarder. + Commons_type commons_; + + // Manage symbol warnings. + Warnings warnings_; +}; + +// We inline get_sized_symbol for efficiency. + +template<int size> +Sized_symbol<size>* +Symbol_table::get_sized_symbol(Symbol* sym ACCEPT_SIZE) const +{ + gold_assert(size == this->get_size()); + return static_cast<Sized_symbol<size>*>(sym); +} + +template<int size> +const Sized_symbol<size>* +Symbol_table::get_sized_symbol(const Symbol* sym ACCEPT_SIZE) const +{ + gold_assert(size == this->get_size()); + return static_cast<const Sized_symbol<size>*>(sym); +} + +} // End namespace gold. + +#endif // !defined(GOLD_SYMTAB_H) |