X-Git-Url: http://git.ipfire.org/?a=blobdiff_plain;f=gold%2Fobject.h;h=e7472893ca614daa5f4cd0e509ee060293874a57;hb=d87bef3a7bc827fa36a69d2c334aa82f7d188d81;hp=66f5dbbd6c4b21b89c4f8380bd25c3af4cbb5522;hpb=c0a628659598a06ce2b60c956763f075a2b64b30;p=thirdparty%2Fbinutils-gdb.git diff --git a/gold/object.h b/gold/object.h index 66f5dbbd6c4..e7472893ca6 100644 --- a/gold/object.h +++ b/gold/object.h @@ -1,6 +1,6 @@ // object.h -- support for an object file for linking in gold -*- C++ -*- -// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc. +// Copyright (C) 2006-2023 Free Software Foundation, Inc. // Written by Ian Lance Taylor . // This file is part of gold. @@ -30,6 +30,7 @@ #include "elfcpp_file.h" #include "fileread.h" #include "target.h" +#include "archive.h" namespace gold { @@ -37,16 +38,18 @@ namespace gold class General_options; class Task; class Cref; -class Archive; 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; -class Symbols_data; +struct Symbols_data; template class Stringpool_template; @@ -55,6 +58,13 @@ class Stringpool_template; 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. @@ -94,7 +104,7 @@ struct Symbol_location_info { std::string source_file; std::string enclosing_symbol_name; - int line_number; + elfcpp::STT enclosing_symbol_type; }; // Data about a single relocation section. This is read in @@ -102,6 +112,13 @@ struct Symbol_location_info 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. @@ -125,6 +142,13 @@ struct Section_relocs struct Read_relocs_data { + Read_relocs_data() + : local_symbols(NULL) + { } + + ~Read_relocs_data() + { delete this->local_symbols; } + typedef std::vector Relocs_list; // The relocations. Relocs_list relocs; @@ -181,6 +205,228 @@ class Xindex 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(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 Compressed_section_map; + +template +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(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). @@ -188,6 +434,8 @@ class Xindex class Object { public: + typedef std::vector 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 @@ -195,14 +443,26 @@ class Object 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), uses_split_stack_(false), - has_no_split_stack_(false), xindex_(NULL), no_export_(false) - { input_file->file().add_object(); } + 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() - { this->input_file_->file().remove_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 tuser. + // Return the name of the object as we would report it to the user. const std::string& name() const { return this->name_; } @@ -217,6 +477,25 @@ class Object 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 @@ -228,6 +507,12 @@ class Object 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* @@ -237,42 +522,71 @@ class Object // Get the file. We pass on const-ness. Input_file* input_file() - { return this->input_file_; } + { + gold_assert(this->input_file_ != NULL); + return this->input_file_; + } const Input_file* input_file() const - { return this->input_file_; } + { + gold_assert(this->input_file_ != NULL); + return this->input_file_; + } // Lock the underlying file. void lock(const Task* t) - { this->input_file()->file().lock(t); } + { + if (this->input_file_ != NULL) + this->input_file_->file().lock(t); + } // Unlock the underlying file. void unlock(const Task* t) - { this->input_file()->file().unlock(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()->file().is_locked(); } + { return this->input_file_ != NULL && this->input_file_->file().is_locked(); } // Return the token, so that the task can be queued. Task_token* token() - { return this->input_file()->file().token(); } + { + if (this->input_file_ == NULL) + return NULL; + return this->input_file()->file().token(); + } // Release the underlying file. void release() - { this->input_file_->file().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 @@ -313,7 +627,7 @@ class Object // Return the name of a section given a section index. std::string - section_name(unsigned int shndx) + section_name(unsigned int shndx) const { return this->do_section_name(shndx); } // Return the section flags given a section index. @@ -351,6 +665,25 @@ class Object 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) @@ -367,6 +700,24 @@ class Object 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. @@ -443,7 +794,10 @@ class Object // Stop caching views in the underlying file. void clear_view_cache_marks() - { this->input_file()->file().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 @@ -453,10 +807,35 @@ class Object 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->input_file()->is_in_system_directory(); } + { 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 @@ -471,13 +850,80 @@ class Object 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; @@ -491,10 +937,25 @@ class Object 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 Location - do_section_contents(unsigned int shndx) = 0; + 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 @@ -502,7 +963,7 @@ class Object // Get the name of a section--implemented by child class. virtual std::string - do_section_name(unsigned int shndx) = 0; + do_section_name(unsigned int shndx) const = 0; // Get section flags--implemented by child class. virtual uint64_t @@ -532,6 +993,22 @@ class Object 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; @@ -540,12 +1017,15 @@ class Object 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 and Sized_dynobj. + // Functions used by both Sized_relobj_file and Sized_dynobj. // Read the section data into a Read_symbols_data object. template @@ -553,6 +1033,16 @@ class Object read_section_data(elfcpp::Elf_file*, 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 + 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) @@ -569,11 +1059,42 @@ class Object Symbol_table*); // If NAME is the name of the special section which indicates that - // this object was compiled with -fstack-split, mark it accordingly, + // 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&); @@ -589,21 +1110,32 @@ class Object // Number of input sections. unsigned int shnum_; // Whether this is a dynamic object. - bool is_dynamic_; + 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_; + bool uses_split_stack_ : 1; // Whether this object contains any functions compiled with the // no_split_stack attribute. - bool has_no_split_stack_; - // Many sections for objects with more than SHN_LORESERVE sections. - Xindex* xindex_; + 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_; + 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. +// The implementation is the template class Sized_relobj_file. class Relobj : public Object { @@ -614,7 +1146,11 @@ class Relobj : public Object map_to_relocatable_relocs_(NULL), object_merge_map_(NULL), relocs_must_follow_section_writes_(false), - sd_(NULL) + 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 @@ -627,7 +1163,7 @@ class Relobj : public Object // Decides which section names have to be included in the worklist // as roots. bool - is_section_name_included(const char *name); + is_section_name_included(const char* name); void copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd, @@ -659,21 +1195,70 @@ class Relobj : public Object // Process the relocs, during garbage collection only. void - gc_process_relocs(const General_options& options, Symbol_table* symtab, - Layout* layout, Read_relocs_data* rd) - { return this->do_gc_process_relocs(options, symtab, layout, rd); } + 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(const General_options& options, Symbol_table* symtab, - Layout* layout, Read_relocs_data* rd) - { return this->do_scan_relocs(options, symtab, layout, rd); } + scan_relocs(Symbol_table* symtab, Layout* layout, Read_relocs_data* rd) + { return this->do_scan_relocs(symtab, layout, rd); } - // The number of local symbols in the input symbol table. - virtual unsigned int - local_symbol_count() const + // 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. @@ -699,11 +1284,29 @@ class Relobj : public Object 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 General_options& options, const Symbol_table* symtab, - const Layout* layout, Output_file* of) - { return this->do_relocate(options, symtab, layout, of); } + 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 @@ -713,23 +1316,16 @@ class Relobj : public Object return this->output_sections_[shndx] != NULL; } - // 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* - output_section(unsigned int shndx) const + // 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()); - return this->output_sections_[shndx]; + this->output_sections_[shndx] = os; } - - // 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); } - + // Set the offset of an input section within its output section. void set_section_offset(unsigned int shndx, uint64_t off) @@ -743,18 +1339,28 @@ class Relobj : public Object relocs_must_follow_section_writes() const { return this->relocs_must_follow_section_writes_; } - // Return the object merge map. Object_merge_map* - merge_map() const - { return this->object_merge_map_; } + get_or_create_merge_map(); - // Set the object merge map. + template void - set_merge_map(Object_merge_map* object_merge_map) - { - gold_assert(this->object_merge_map_ == NULL); - this->object_merge_map_ = object_merge_map; - } + initialize_input_to_output_map(unsigned int shndx, + typename elfcpp::Elf_types::Elf_Addr starting_address, + Unordered_map::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 @@ -778,6 +1384,26 @@ class Relobj : public Object 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 @@ -790,18 +1416,52 @@ class Relobj : public Object // Process the relocs--implemented by child class. virtual void - do_gc_process_relocs(const General_options&, Symbol_table*, Layout*, - Read_relocs_data*) = 0; + do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*) = 0; // Scan the relocs--implemented by child class. virtual void - do_scan_relocs(const General_options&, Symbol_table*, Layout*, - Read_relocs_data*) = 0; + 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*, @@ -824,12 +1484,7 @@ class Relobj : public Object // Relocate the input sections and write out the local // symbols--implemented by child class. virtual void - do_relocate(const General_options& options, const Symbol_table* symtab, - const Layout*, Output_file* of) = 0; - - // Get the offset of a section--implemented by child class. - virtual uint64_t - do_output_section_offset(unsigned int shndx) const = 0; + do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of) = 0; // Set the offset of a section--implemented by child class. virtual void @@ -840,6 +1495,16 @@ class Relobj : public Object 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() @@ -863,6 +1528,56 @@ class Relobj : public Object 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_; @@ -881,7 +1596,15 @@ class Relobj : public Object // 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_; + 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 @@ -986,14 +1709,20 @@ class Symbol_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), has_output_value_(true) + 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 Value - value(const Sized_relobj* object, Value addend) const + value(const Sized_relobj_file* object, Value addend) const { if (this->has_output_value_) return this->u_.value + addend; @@ -1056,17 +1785,39 @@ class Symbol_value input_value() const { return this->u_.value; } - // Return whether this symbol should go into the output symbol + // 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 - needs_output_symtab_entry() const - { return this->output_symtab_index_ != -1U; } + 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->output_symtab_index_ != 0); + gold_assert(this->is_output_symtab_index_set() + && this->output_symtab_index_ != -1U); return this->output_symtab_index_; } @@ -1074,7 +1825,8 @@ class Symbol_value void set_output_symtab_index(unsigned int i) { - gold_assert(this->output_symtab_index_ == 0); + gold_assert(!this->is_output_symtab_index_set()); + gold_assert(i != 0 && i != -1U && i != -2U); this->output_symtab_index_ = i; } @@ -1087,6 +1839,15 @@ class Symbol_value 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() @@ -1095,7 +1856,7 @@ class Symbol_value this->output_dynsym_index_ = 0; } - // Return whether this symbol should go into the output symbol + // Return whether this symbol should go into the dynamic symbol // table. bool needs_output_dynsym_entry() const @@ -1103,11 +1864,21 @@ class Symbol_value 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; } @@ -1157,21 +1928,39 @@ class Symbol_value set_is_tls_symbol() { this->is_tls_symbol_ = true; } - // Return TRUE if this is a TLS symbol. + // 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 -1 if the symbol should not go into the symbol table. + // 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 -1 if the symbol should not go into the symbol table. + // 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_ : 28; + unsigned int input_shndx_ : 27; // Whether the section index is an ordinary index, not a special // value. bool is_ordinary_shndx_ : 1; @@ -1179,6 +1968,8 @@ class Symbol_value 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 @@ -1198,135 +1989,251 @@ class Symbol_value } u_; }; -// 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. +// 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 Got_offset_list +class Reloc_symbol_changes { public: - Got_offset_list() - : got_type_(-1U), got_offset_(0), got_next_(NULL) + Reloc_symbol_changes(size_t count) + : vec_(count, NULL) { } - Got_offset_list(unsigned int got_type, unsigned int got_offset) - : got_type_(got_type), got_offset_(got_offset), got_next_(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 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 +class Sized_relobj : public Relobj +{ + public: + typedef typename elfcpp::Elf_types::Elf_Addr Address; + typedef Relobj::Symbols Symbols; + + static const Address invalid_address = static_cast
(0) - 1; + + Sized_relobj(const std::string& name, Input_file* input_file) + : Relobj(name, input_file), local_got_offsets_(), section_offsets_() { } - ~Got_offset_list() - { - if (this->got_next_ != NULL) - { - delete this->got_next_; - this->got_next_ = NULL; - } + 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* + sized_relobj() + { return NULL; } + + const virtual Sized_relobj_file* + 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]; } - // Initialize the fields to their default values. + // Iterate over local symbols, calling a visitor class V for each GOT offset + // associated with a local symbol. void - init() + 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
& + 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 { - this->got_type_ = -1U; - this->got_offset_ = 0; - this->got_next_ = NULL; + Address off = this->get_output_section_offset(shndx); + if (off == invalid_address) + return -1ULL; + return off; } - // Set the offset for the GOT entry of type GOT_TYPE. + // Set the offset of a section. void - set_offset(unsigned int got_type, unsigned int got_offset) + do_set_section_offset(unsigned int shndx, uint64_t off) { - if (this->got_type_ == -1U) - { - this->got_type_ = got_type; - this->got_offset_ = got_offset; - } - else - { - for (Got_offset_list* g = this; g != NULL; g = g->got_next_) - { - if (g->got_type_ == got_type) - { - g->got_offset_ = got_offset; - return; - } - } - Got_offset_list* g = new Got_offset_list(got_type, got_offset); - g->got_next_ = this->got_next_; - this->got_next_ = g; - } + gold_assert(shndx < this->section_offsets_.size()); + this->section_offsets_[shndx] = + (off == static_cast(-1) + ? invalid_address + : convert_types(off)); } - // Return the offset for a GOT entry of type GOT_TYPE. + // 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 - get_offset(unsigned int got_type) const + do_local_got_offset(unsigned int symndx, unsigned int got_type, + uint64_t addend) const { - for (const Got_offset_list* g = this; g != NULL; g = g->got_next_) + 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 { - if (g->got_type_ == got_type) - return g->got_offset_; + Got_offset_list* g = new Got_offset_list(got_type, got_offset, addend); + std::pair ins = + this->local_got_offsets_.insert(std::make_pair(key, g)); + gold_assert(ins.second); } - return -1U; } - private: - unsigned int got_type_; - unsigned int got_offset_; - Got_offset_list* got_next_; -}; - -// 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. + // Return the word size of the object file. + virtual int + do_elfsize() const + { return size; } -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]; } + // Return TRUE if this is a big-endian object file. + virtual bool + do_is_big_endian() const + { return big_endian; } private: - std::vector vec_; + // The GOT offsets of local symbols. This map also stores GOT offsets + // for tp-relative offsets for TLS symbols. + typedef Unordered_map 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
section_offsets_; }; // A regular object file. This is size and endian specific. template -class Sized_relobj : public Relobj +class Sized_relobj_file : public Sized_relobj { public: typedef typename elfcpp::Elf_types::Elf_Addr Address; - typedef std::vector Symbols; + typedef typename Sized_relobj::Symbols Symbols; typedef std::vector > Local_values; static const Address invalid_address = static_cast
(0) - 1; - Sized_relobj(const std::string& name, Input_file* input_file, off_t offset, - const typename elfcpp::Ehdr&); + 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(); + Sized_relobj_file(const std::string& name, + Input_file* input_file, + off_t offset, + const typename elfcpp::Ehdr&); - // 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; } + ~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* + sized_relobj() + { return this; } + + const Sized_relobj_file* + 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 @@ -1390,6 +2297,14 @@ class Sized_relobj : public Relobj 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) @@ -1398,57 +2313,19 @@ class Sized_relobj : public Relobj this->local_values_[sym].set_needs_output_dynsym_entry(); } - // Return whether the local symbol SYMNDX has a GOT offset. - // For TLS symbols, the GOT entry will hold its tp-relative offset. + // Return whether the local symbol SYMNDX has a PLT offset. bool - local_has_got_offset(unsigned int symndx, unsigned int got_type) const - { - Local_got_offsets::const_iterator p = - this->local_got_offsets_.find(symndx); - return (p != this->local_got_offsets_.end() - && p->second->get_offset(got_type) != -1U); - } + local_has_plt_offset(unsigned int symndx) const; - // Return the GOT offset of the local symbol SYMNDX. - unsigned int - local_got_offset(unsigned int symndx, unsigned int got_type) const - { - Local_got_offsets::const_iterator p = - this->local_got_offsets_.find(symndx); - gold_assert(p != this->local_got_offsets_.end()); - unsigned int off = p->second->get_offset(got_type); - gold_assert(off != -1U); - return off; - } - - // Set the GOT offset of the local symbol SYMNDX to GOT_OFFSET. + // Set the PLT offset of the local symbol SYMNDX. void - set_local_got_offset(unsigned int symndx, unsigned int got_type, - unsigned int got_offset) - { - Local_got_offsets::const_iterator p = - this->local_got_offsets_.find(symndx); - if (p != this->local_got_offsets_.end()) - p->second->set_offset(got_type, got_offset); - else - { - Got_offset_list* g = new Got_offset_list(got_type, got_offset); - std::pair ins = - this->local_got_offsets_.insert(std::make_pair(symndx, g)); - gold_assert(ins.second); - } - } + set_local_plt_offset(unsigned int symndx, unsigned int plt_offset); - // 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]; - } + // Adjust this local symbol value. Return false if the symbol + // should be discarded from the output file. + bool + adjust_local_symbol(Symbol_value* 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 @@ -1461,14 +2338,42 @@ class Sized_relobj : public Relobj // and return its output address. This is used only for relocations in // debugging sections. Address - map_to_kept_section(unsigned int shndx, bool* found) const; + map_to_kept_section(unsigned int shndx, std::string& section_name, + bool* found) const; - // Make section offset invalid. This is needed for relaxation. - void - invalidate_section_offset(unsigned int shndx) - { this->do_invalidate_section_offset(shndx); } + // 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* lv_in, + Symbol_value* 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::Output_sections + Output_sections; + // Set up. virtual void do_setup(); @@ -1477,11 +2382,44 @@ class Sized_relobj : public Relobj 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* 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*); @@ -1495,6 +2433,15 @@ class Sized_relobj : public Relobj 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*); @@ -1502,13 +2449,11 @@ class Sized_relobj : public Relobj // Process the relocs to find list of referenced sections. Used only // during garbage collection. void - do_gc_process_relocs(const General_options&, Symbol_table*, Layout*, - Read_relocs_data*); + do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*); // Scan the relocs and adjust the symbol table. void - do_scan_relocs(const General_options&, Symbol_table*, Layout*, - Read_relocs_data*); + do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*); // Count the local symbols. void @@ -1529,8 +2474,7 @@ class Sized_relobj : public Relobj // Relocate the input sections and write out the local symbols. void - do_relocate(const General_options& options, const Symbol_table* symtab, - const Layout*, Output_file* of); + do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of); // Get the size of a section. uint64_t @@ -1539,13 +2483,23 @@ class Sized_relobj : public Relobj // Get the name of a section. std::string - do_section_name(unsigned int shndx) + do_section_name(unsigned int shndx) const { return this->elf_file_.section_name(shndx); } // Return the location of the contents of a section. - Object::Location - do_section_contents(unsigned int shndx) - { return this->elf_file_.section_contents(shndx); } + 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 @@ -1588,31 +2542,10 @@ class Sized_relobj : public Relobj void do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const; - // 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] = convert_types(off); - } - - // Set the offset of a section to invalid_address. - virtual void - do_invalidate_section_offset(unsigned int shndx) - { - gold_assert(shndx < this->section_offsets_.size()); - this->section_offsets_[shndx] = invalid_address; - } + // Get the global symbols. + const Symbols* + do_get_global_symbols() const + { return &this->symbols_; } // Adjust a section index if necessary. unsigned int @@ -1648,24 +2581,76 @@ class Sized_relobj : public Relobj local_values() { return &this->local_values_; } + // Views and sizes when relocating. + struct View_size + { + unsigned char* view; + typename elfcpp::Elf_types::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 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*) 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 This; + typedef Sized_relobj_file This; static const int ehdr_size = elfcpp::Elf_sizes::ehdr_size; static const int shdr_size = elfcpp::Elf_sizes::shdr_size; static const int sym_size = elfcpp::Elf_sizes::sym_size; typedef elfcpp::Shdr Shdr; + typedef elfcpp::Shdr_write 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(Relobj* a_object, unsigned int a_shndx) - : object(a_object), shndx(a_shndx) + 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) { } - Relobj* object; - unsigned int shndx; + 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 Kept_comdat_section_table; @@ -1688,7 +2673,7 @@ class Sized_relobj : public Relobj // 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, + const unsigned char*, const char*, section_size_type, std::vector*); // Whether to include a linkonce section in the link. @@ -1699,67 +2684,82 @@ class Sized_relobj : public Relobj // Layout an input section. void layout_section(Layout* layout, unsigned int shndx, const char* name, - typename This::Shdr& shdr, unsigned int reloc_shndx, - unsigned int reloc_type); + const typename This::Shdr& shdr, unsigned int sh_type, + unsigned int reloc_shndx, unsigned int reloc_type); - // Views and sizes when relocating. - struct View_size - { - unsigned char* view; - typename elfcpp::Elf_types::Elf_Addr address; - off_t offset; - section_size_type view_size; - bool is_input_output_view; - bool is_postprocessing_view; - }; + // 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); - typedef std::vector Views; + // 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 unsigned char* pshdrs, Output_file*, Views*); + write_sections(const Layout*, const unsigned char* pshdrs, Output_file*, + Views*); // Relocate the sections in the output file. void - relocate_sections(const General_options& options, const Symbol_table*, - const Layout*, const unsigned char* pshdrs, Views*); + 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(const General_options&, Symbol_table*, Layout*, - const unsigned char* plocal_syms, + 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 void - emit_relocs_scan_reltype(const General_options&, Symbol_table*, Layout*, + emit_relocs_scan_reltype(Symbol_table*, Layout*, const unsigned char* plocal_syms, const Read_relocs_data::Relocs_list::iterator&, Relocatable_relocs*); - // Emit the relocs for --emit-relocs. + // Scan the input relocations for --incremental. void - emit_relocs(const Relocate_info*, unsigned int, - unsigned int sh_type, const unsigned char* prelocs, - size_t reloc_count, Output_section*, Address output_offset, - unsigned char* view, Address address, - section_size_type view_size, - unsigned char* reloc_view, section_size_type reloc_view_size); + incremental_relocs_scan(const Read_relocs_data::Relocs_list::iterator&); - // Emit the relocs for --emit-relocs, templatized on the type of the - // relocation section. + // Scan the input relocations for --incremental, templatized on the + // type of the relocation section. template void - emit_relocs_reltype(const Relocate_info*, unsigned int, - const unsigned char* prelocs, size_t reloc_count, - Output_section*, Address output_offset, - unsigned char* view, Address address, - section_size_type view_size, - unsigned char* reloc_view, - section_size_type reloc_view_size); + incremental_relocs_scan_reltype( + const Read_relocs_data::Relocs_list::iterator&); + + void + incremental_relocs_write(const Relocate_info*, + unsigned int sh_type, + const unsigned char* prelocs, + size_t reloc_count, + Output_section*, + Address output_offset, + Output_file*); + + template + void + incremental_relocs_write_reltype(const Relocate_info*, + 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 Function_offsets; @@ -1770,7 +2770,8 @@ class Sized_relobj : public Relobj 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); + Reloc_symbol_changes** reloc_map, + const Sized_target* target); template void @@ -1778,7 +2779,8 @@ class Sized_relobj : public Relobj unsigned int shndx, const unsigned char* prelocs, size_t reloc_count, unsigned char* view, section_size_type view_size, - Reloc_symbol_changes** reloc_map); + Reloc_symbol_changes** reloc_map, + const Sized_target* target); // Find all functions in a section. void @@ -1791,74 +2793,80 @@ class Sized_relobj : public Relobj const Stringpool_template*, const Stringpool_template*, Output_symtab_xindex*, - Output_symtab_xindex*); - - // Clear the local symbol information. - void - clear_local_symbols() - { - this->local_values_.clear(); - this->local_got_offsets_.clear(); - } + Output_symtab_xindex*, + off_t); // Record a mapping from discarded section SHNDX to the corresponding // kept section. void - set_kept_comdat_section(unsigned int shndx, Relobj* kept_object, - unsigned int kept_shndx) + 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(kept_object, kept_shndx); + 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, Relobj** kept_object, - unsigned int* kept_shndx) const + 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; - *kept_object = p->second.object; - *kept_shndx = p->second.shndx; + *is_comdat = p->second.is_comdat; + *symndx = p->second.symndx; + *sh_size = p->second.sh_size; + *kept_section = p->second.kept_section; return true; } - // The GOT offsets of local symbols. This map also stores GOT offsets - // for tp-relative offsets for TLS symbols. - typedef Unordered_map Local_got_offsets; - - // The TLS GOT offsets of local symbols. The map stores the offsets - // for either a single GOT entry that holds the module index of a TLS - // symbol, or a pair of GOT entries containing the module index and - // dtv-relative offset. - struct Tls_got_entry - { - Tls_got_entry(int got_offset, bool have_pair) - : got_offset_(got_offset), - have_pair_(have_pair) - { } - int got_offset_; - bool have_pair_; - }; - typedef Unordered_map Local_tls_got_offsets; + // 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* lv_in, + Symbol_value* lv_out, + bool relocatable, + const Output_sections& out_sections, + const std::vector
& out_offsets, + const Symbol_table* symtab); + + // The PLT offsets of local symbols. + typedef Unordered_map Local_plt_offsets; // Saved information for sections whose layout was deferred. struct Deferred_layout { static const int shdr_size = elfcpp::Elf_sizes::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) - : shndx_(shndx), name_(name), reloc_shndx_(reloc_shndx), + : 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); } - unsigned int shndx_; std::string name_; + unsigned int shndx_; unsigned int reloc_shndx_; unsigned int reloc_type_; unsigned char shdr_data_[shdr_size]; @@ -1866,6 +2874,11 @@ class Sized_relobj : public Relobj // General access to the ELF file. elfcpp::Elf_file 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. @@ -1879,28 +2892,27 @@ class Sized_relobj : public Relobj Symbols symbols_; // Number of symbols defined in object file itself. size_t defined_count_; - // File offset for local symbols. + // File offset for local symbols (relative to start of symbol table). off_t local_symbol_offset_; - // File offset for local dynamic symbols. + // File offset for local dynamic symbols (absolute). off_t local_dynsym_offset_; // Values of local symbols. Local_values local_values_; - // GOT offsets for local non-TLS symbols, and tp-relative offsets - // for TLS symbols, indexed by symbol number. - 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
section_offsets_; + // PLT offsets for local symbols. + Local_plt_offsets local_plt_offsets_; // Table mapping discarded comdat sections to corresponding kept sections. Kept_comdat_section_table kept_comdat_sections_; // Whether this object has a GNU style .eh_frame section. bool has_eh_frame_; - // If this object has a GNU style .eh_frame section that is discarded in - // output, record the index here. Otherwise it is -1U. - unsigned int discarded_eh_frame_shndx_; + // True if the layout of this object was deferred, waiting for plugin + // replacement files. + bool is_deferred_layout_; // The list of sections whose layout was deferred. std::vector deferred_layout_; + // The list of relocation sections whose layout was deferred. + std::vector 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. @@ -1947,6 +2959,10 @@ class Input_objects 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 @@ -1972,6 +2988,11 @@ class Input_objects 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 @@ -1986,7 +3007,7 @@ class Input_objects // The list of dynamic objects included in the link. Dynobj_list dynobj_list_; // SONAMEs that we have seen. - Unordered_set sonames_; + Unordered_map sonames_; // Manage cross-references if requested. Cref* cref_; }; @@ -1997,18 +3018,22 @@ class Input_objects template struct Relocate_info { - // Command line options. - const General_options* options; // Symbol table. const Symbol_table* symtab; // Layout. const Layout* layout; // Object being relocated. - Sized_relobj* object; + Sized_relobj_file* 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. @@ -2016,13 +3041,38 @@ struct Relocate_info 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 Section_id; + +// This is similar to Section_id but is used when the section +// pointers are const. +typedef std::pair 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(loc.first) ^ loc.second; } +}; + +struct Const_section_id_hash +{ + size_t operator()(const Const_section_id& loc) const + { return reinterpret_cast(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); + 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