X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gold%2Fsymtab.h;h=913ccdebca1c64d19bdd36cd53e68c3b3140632f;hb=6d350754a32007465f9adbc11b87339e4493b358;hp=7984dd6ff84af1ba30288a464cd4d01e14886d65;hpb=e051745c838bf29e564fb2665339f97c8383b9e8;p=deliverable%2Fbinutils-gdb.git diff --git a/gold/symtab.h b/gold/symtab.h index 7984dd6ff8..913ccdebca 100644 --- a/gold/symtab.h +++ b/gold/symtab.h @@ -1,6 +1,6 @@ // symtab.h -- the gold symbol table -*- C++ -*- -// Copyright (C) 2006-2014 Free Software Foundation, Inc. +// Copyright (C) 2006-2020 Free Software Foundation, Inc. // Written by Ian Lance Taylor . // This file is part of gold. @@ -140,6 +140,11 @@ class Symbol set_is_default() { this->is_def_ = true; } + // Set that this version is not the default for this symbol name. + void + set_is_not_default() + { this->is_def_ = false; } + // Return the symbol's name as name@version (or name@@version). std::string versioned_name() const; @@ -154,7 +159,7 @@ class Symbol object() const { gold_assert(this->source_ == FROM_OBJECT); - return this->u_.from_object.object; + return this->u1_.object; } // Return the index of the section in the input relocatable or @@ -164,7 +169,7 @@ class Symbol { gold_assert(this->source_ == FROM_OBJECT); *is_ordinary = this->is_ordinary_shndx_; - return this->u_.from_object.shndx; + return this->u2_.shndx; } // Return the output data section with which this symbol is @@ -174,7 +179,7 @@ class Symbol output_data() const { gold_assert(this->source_ == IN_OUTPUT_DATA); - return this->u_.in_output_data.output_data; + return this->u1_.output_data; } // If this symbol was defined with respect to an output data @@ -183,7 +188,7 @@ class Symbol offset_is_from_end() const { gold_assert(this->source_ == IN_OUTPUT_DATA); - return this->u_.in_output_data.offset_is_from_end; + return this->u2_.offset_is_from_end; } // Return the output segment with which this symbol is associated, @@ -193,7 +198,7 @@ class Symbol output_segment() const { gold_assert(this->source_ == IN_OUTPUT_SEGMENT); - return this->u_.in_output_segment.output_segment; + return this->u1_.output_segment; } // If this symbol was defined with respect to an output segment, @@ -202,7 +207,7 @@ class Symbol offset_base() const { gold_assert(this->source_ == IN_OUTPUT_SEGMENT); - return this->u_.in_output_segment.offset_base; + return this->u2_.offset_base; } // Return the symbol binding. @@ -324,6 +329,11 @@ class Symbol set_in_reg() { this->in_reg_ = true; } + // Forget this symbol was seen in a regular object. + void + clear_in_reg() + { this->in_reg_ = false; } + // Return whether this symbol has been seen in a dynamic object. bool in_dyn() const @@ -334,6 +344,11 @@ class Symbol set_in_dyn() { this->in_dyn_ = true; } + // Return whether this symbol is defined in a dynamic object. + bool + from_dyn() const + { return this->source_ == FROM_OBJECT && this->object()->is_dynamic(); } + // Return whether this symbol has been seen in a real ELF object. // (IN_REG will return TRUE if the symbol has been seen in either // a real ELF object or an object claimed by a plugin.) @@ -526,7 +541,8 @@ class Symbol { return (this->is_undefined() && (this->binding() == elfcpp::STB_WEAK - || this->is_undef_binding_weak())); + || this->is_undef_binding_weak() + || parameters->options().weak_unresolved_symbols())); } // Return whether this is a strong undefined symbol. @@ -535,7 +551,8 @@ class Symbol { return (this->is_undefined() && this->binding() != elfcpp::STB_WEAK - && !this->is_undef_binding_weak()); + && !this->is_undef_binding_weak() + && !parameters->options().weak_unresolved_symbols()); } // Return whether this is an absolute symbol. @@ -555,8 +572,6 @@ class Symbol { if (this->source_ != FROM_OBJECT) return false; - if (this->type_ == elfcpp::STT_COMMON) - return true; bool is_ordinary; unsigned int shndx = this->shndx(&is_ordinary); return !is_ordinary && Symbol::is_common_shndx(shndx); @@ -604,10 +619,8 @@ class Symbol if (parameters->options().in_dynamic_list(this->name())) return true; - // If the user used -Bsymbolic or provided a --dynamic-list script, - // then nothing (else) is preemptible. - if (parameters->options().Bsymbolic() - || parameters->options().have_dynamic_list()) + // If the user used -Bsymbolic, then nothing (else) is preemptible. + if (parameters->options().Bsymbolic()) return false; // If the user used -Bsymbolic-functions, then functions are not @@ -867,11 +880,41 @@ class Symbol is_cxx_vtable() const { return is_prefix_of("_ZTV", this->name_); } + // Return true if this symbol is protected in a shared object. + // This is not the same as checking if visibility() == elfcpp::STV_PROTECTED, + // because the visibility_ field reflects the symbol's visibility from + // outside the shared object. + bool + is_protected() const + { return this->is_protected_; } + + // Mark this symbol as protected in a shared object. + void + set_is_protected() + { this->is_protected_ = true; } + + // Return state of PowerPC64 ELFv2 specific flag. + bool + non_zero_localentry() const + { return this->non_zero_localentry_; } + + // Set PowerPC64 ELFv2 specific flag. + void + set_non_zero_localentry() + { this->non_zero_localentry_ = true; } + + // Completely override existing symbol. Everything bar name_, + // version_, and is_forced_local_ flag are copied. version_ is + // cleared if from->version_ is clear. Returns true if this symbol + // should be forced local. + bool + clone(const Symbol* from); + protected: // Instances of this class should always be created at a specific // size. Symbol() - { memset(this, 0, sizeof *this); } + { memset(static_cast(this), 0, sizeof *this); } // Initialize the general fields. void @@ -947,38 +990,38 @@ class Symbol 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_; + // This is used if SOURCE_ == FROM_OBJECT. + // Object in which symbol is defined, or in which it was first + // seen. + Object* object; + + // This is used if SOURCE_ == IN_OUTPUT_DATA. + // 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; + + // This is used if SOURCE_ == IN_OUTPUT_SEGMENT. + // Output_segment in which the symbol is defined. Before + // Layout::finalize the symbol's value is an offset. + Output_segment* output_segment; + } u1_; + + union + { + // This is used if SOURCE_ == FROM_OBJECT. + // Section number in object in which symbol is defined. + unsigned int shndx; + + // This is used if SOURCE_ == IN_OUTPUT_DATA. + // True if the offset is from the end, false if the offset is + // from the beginning. + bool offset_is_from_end; + + // This is used if SOURCE_ == IN_OUTPUT_SEGMENT. + // The base to use for the offset before Layout::finalize. + Segment_offset_base offset_base; + } u2_; // 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 @@ -992,16 +1035,16 @@ class Symbol // non-zero value during Layout::finalize. unsigned int dynsym_index_; - // The GOT section entries for this symbol. 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_offset_list got_offsets_; - // If this symbol has an entry in the PLT section, then this is the // offset from the start of the PLT section. This is -1U if there // is no PLT entry. unsigned int plt_offset_; + // The GOT section entries for this symbol. 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_offset_list got_offsets_; + // Symbol type (bits 0 to 3). elfcpp::STT type_ : 4; // Symbol binding (bits 4 to 7). @@ -1043,7 +1086,7 @@ class Symbol // True if this symbol was forced to local visibility by a version // script (bit 28). bool is_forced_local_ : 1; - // True if the field u_.from_object.shndx is an ordinary section + // True if the field u2_.shndx is an ordinary section // index, not one of the special codes from SHN_LORESERVE to // SHN_HIRESERVE (bit 29). bool is_ordinary_shndx_ : 1; @@ -1064,6 +1107,12 @@ class Symbol bool undef_binding_weak_ : 1; // True if this symbol is a predefined linker symbol (bit 34). bool is_predefined_ : 1; + // True if this symbol has protected visibility in a shared object (bit 35). + // The visibility_ field will be STV_DEFAULT in this case because we + // must treat it as such from outside the shared object. + bool is_protected_ : 1; + // Used by PowerPC64 ELFv2 to track st_other localentry (bit 36). + bool non_zero_localentry_ : 1; }; // The parts of a symbol which are size specific. Using a template @@ -1110,8 +1159,8 @@ class Sized_symbol : public Symbol // Initialize fields for an undefined symbol. void - init_undefined(const char* name, const char* version, elfcpp::STT, - elfcpp::STB, elfcpp::STV, unsigned char nonvis); + init_undefined(const char* name, const char* version, Value_type value, + elfcpp::STT, elfcpp::STB, elfcpp::STV, unsigned char nonvis); // Override existing symbol. template @@ -1150,6 +1199,13 @@ class Sized_symbol : public Symbol void allocate_common(Output_data*, Value_type value); + // Completely override existing symbol. Everything bar name_, + // version_, and is_forced_local_ flag are copied. version_ is + // cleared if from->version_ is clear. Returns true if this symbol + // should be forced local. + bool + clone(const Sized_symbol* from); + private: Sized_symbol(const Sized_symbol&); Sized_symbol& operator=(const Sized_symbol&); @@ -1253,6 +1309,16 @@ struct Symbol_location } }; +// A map from symbol name (as a pointer into the namepool) to all +// the locations the symbols is (weakly) defined (and certain other +// conditions are met). This map will be used later to detect +// possible One Definition Rule (ODR) violations. +struct Symbol_location_hash +{ + size_t operator()(const Symbol_location& loc) const + { return reinterpret_cast(loc.object) ^ loc.offset ^ loc.shndx; } +}; + // 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 @@ -1372,7 +1438,7 @@ class Symbol_table // Returns true if ICF determined that this is a duplicate section. bool - is_section_folded(Object* obj, unsigned int shndx) const; + is_section_folded(Relobj* obj, unsigned int shndx) const; void set_gc(Garbage_collection* gc) @@ -1478,6 +1544,12 @@ class Symbol_table define_symbols(const Layout*, int count, const Define_symbol_in_segment*, bool only_if_ref); + // Add a target-specific global symbol. + // (Used by SPARC backend to add STT_SPARC_REGISTER symbols.) + void + add_target_global_symbol(Symbol* sym) + { this->target_symbols_.push_back(sym); } + // Define SYM using a COPY reloc. POSD is the Output_data where the // symbol should be defined--typically a .dyn.bss section. VALUE is // the offset within POSD. @@ -1508,6 +1580,10 @@ class Symbol_table saw_undefined() const { return this->saw_undefined_; } + void + set_has_gnu_output() + { this->has_gnu_output_ = true; } + // Allocate the common symbols void allocate_commons(Layout*, Mapfile*); @@ -1548,12 +1624,13 @@ class Symbol_table get_copy_source(const Symbol* sym) const; // Set the dynamic symbol indexes. INDEX is the index of the first - // global dynamic symbol. Pointers to the symbols are stored into + // global dynamic symbol. Return the count of forced-local symbols in + // *PFORCED_LOCAL_COUNT. 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(unsigned int index, std::vector*, - Stringpool*, Versions*); + set_dynsym_indexes(unsigned int index, unsigned int* pforced_local_count, + std::vector*, Stringpool*, Versions*); // Finalize the symbol table after we have set the final addresses // of all the input sections. This sets the final symbol indexes, @@ -1638,6 +1715,15 @@ class Symbol_table version_script() const { return version_script_; } + // Completely override existing symbol. + template + void + clone(Sized_symbol* to, const Sized_symbol* from) + { + if (to->clone(from)) + this->force_local(to); + } + private: Symbol_table(const Symbol_table&); Symbol_table& operator=(const Symbol_table&); @@ -1668,16 +1754,6 @@ class Symbol_table typedef Unordered_map Symbol_table_type; - // A map from symbol name (as a pointer into the namepool) to all - // the locations the symbols is (weakly) defined (and certain other - // conditions are met). This map will be used later to detect - // possible One Definition Rule (ODR) violations. - struct Symbol_location_hash - { - size_t operator()(const Symbol_location& loc) const - { return reinterpret_cast(loc.object) ^ loc.offset ^ loc.shndx; } - }; - typedef Unordered_map > Odr_map; @@ -1708,7 +1784,8 @@ class Symbol_table const elfcpp::Sym& sym, unsigned int st_shndx, bool is_ordinary, unsigned int orig_st_shndx, - Object*, const char* version); + Object*, const char* version, + bool is_default_version); template void @@ -1727,7 +1804,7 @@ class Symbol_table // resolve.cc. static bool should_override(const Symbol*, unsigned int, elfcpp::STT, Defined, - Object*, bool*, bool*); + Object*, bool*, bool*, bool); // Report a problem in symbol resolution. static void @@ -1762,8 +1839,9 @@ class Symbol_table template Sized_symbol* define_special_symbol(const char** pname, const char** pversion, - bool only_if_ref, Sized_symbol** poldsym, - bool* resolve_oldsym); + bool only_if_ref, elfcpp::STV visibility, + Sized_symbol** poldsym, + bool* resolve_oldsym, bool is_forced_local); // Define a symbol in an Output_data, sized version. template @@ -1901,10 +1979,14 @@ class Symbol_table unsigned int 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. + // The index of the first global dynamic symbol (including + // forced-local symbols). unsigned int first_dynamic_global_index_; - // The number of global dynamic symbols, or 0 if none. + // The number of global dynamic symbols (including forced-local symbols), + // or 0 if none. unsigned int dynamic_count_; + // Set if a STT_GNU_IFUNC or STB_GNU_UNIQUE symbol will be output. + bool has_gnu_output_; // The symbol hash table. Symbol_table_type table_; // A pool of symbol names. This is used for all global symbols. @@ -1947,6 +2029,8 @@ class Symbol_table const Version_script_info& version_script_; Garbage_collection* gc_; Icf* icf_; + // Target-specific symbols, if any. + std::vector target_symbols_; }; // We inline get_sized_symbol for efficiency.