X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gold%2Farchive.h;h=2943c4eabbfb9652e4098c7c9aeb19b419c8891c;hb=5430098f1807e084fe4ff5057040d68435f3d8a2;hp=24fdb2b1f27ab0fbed187386270db0d519535019;hpb=ac45a351cf89f2a832a04052688d325b5b2ac903;p=deliverable%2Fbinutils-gdb.git diff --git a/gold/archive.h b/gold/archive.h index 24fdb2b1f2..2943c4eabb 100644 --- a/gold/archive.h +++ b/gold/archive.h @@ -1,6 +1,6 @@ // archive.h -- archive support for gold -*- C++ -*- -// Copyright 2006, 2007, 2008 Free Software Foundation, Inc. +// Copyright (C) 2006-2017 Free Software Foundation, Inc. // Written by Ian Lance Taylor . // This file is part of gold. @@ -33,27 +33,137 @@ namespace gold { class Task; +class Input_argument; class Input_file; class Input_objects; class Input_group; class Layout; class Symbol_table; class Object; -class Read_symbols_data; +struct Read_symbols_data; +class Input_file_lib; +class Incremental_archive_entry; + +// An entry in the archive map of offsets to members. +struct Archive_member +{ + Archive_member() + : obj_(NULL), sd_(NULL), arg_serial_(0) + { } + Archive_member(Object* obj, Read_symbols_data* sd) + : obj_(obj), sd_(sd), arg_serial_(0) + { } + // The object file. + Object* obj_; + // The data to pass from read_symbols() to add_symbols(). + Read_symbols_data* sd_; + // The serial number of the file in the argument list. + unsigned int arg_serial_; +}; + +// This class serves as a base class for Archive and Lib_group objects. + +class Library_base +{ + public: + Library_base(Task* task) + : task_(task), incremental_info_(NULL) + { } + + virtual + ~Library_base() + { } + + // The file name. + const std::string& + filename() const + { return this->do_filename(); } + + // The modification time of the archive file. + Timespec + get_mtime() + { return this->do_get_mtime(); } + + // When we see a symbol in an archive we might decide to include the member, + // not include the member or be undecided. This enum represents these + // possibilities. + + enum Should_include + { + SHOULD_INCLUDE_NO, + SHOULD_INCLUDE_YES, + SHOULD_INCLUDE_UNKNOWN + }; + + static Should_include + should_include_member(Symbol_table* symtab, Layout*, const char* sym_name, + Symbol** symp, std::string* why, char** tmpbufp, + size_t* tmpbuflen); + + // Store a pointer to the incremental link info for the library. + void + set_incremental_info(Incremental_archive_entry* info) + { this->incremental_info_ = info; } + + // Return the pointer to the incremental link info for the library. + Incremental_archive_entry* + incremental_info() const + { return this->incremental_info_; } + + // Abstract base class for processing unused symbols. + class Symbol_visitor_base + { + public: + Symbol_visitor_base() + { } + + virtual + ~Symbol_visitor_base() + { } + + // This function will be called for each unused global + // symbol in a library, with a pointer to the symbol name. + virtual void + visit(const char* /* name */) = 0; + }; + + // Iterator for unused global symbols in the library. + // Calls v->visit() for each global symbol defined + // in each unused library member, passing a pointer to + // the symbol name. + void + for_all_unused_symbols(Symbol_visitor_base* v) const + { this->do_for_all_unused_symbols(v); } + + protected: + // The task reading this archive. + Task *task_; + + private: + // The file name. + virtual const std::string& + do_filename() const = 0; + + // Return the modification time of the archive file. + virtual Timespec + do_get_mtime() = 0; + + // Iterator for unused global symbols in the library. + virtual void + do_for_all_unused_symbols(Symbol_visitor_base* v) const = 0; + + // The incremental link information for this archive. + Incremental_archive_entry* incremental_info_; +}; // This class represents an archive--generally a libNAME.a file. // Archives have a symbol table and a list of objects. -class Archive +class Archive : public Library_base { public: Archive(const std::string& name, Input_file* input_file, - bool is_thin_archive, Dirsearch* dirpath, Task* task) - : name_(name), input_file_(input_file), armap_(), armap_names_(), - extended_names_(), armap_checked_(), seen_offsets_(), members_(), - is_thin_archive_(is_thin_archive), nested_archives_(), - dirpath_(dirpath), task_(task), num_members_(0) - { } + bool is_thin_archive, Dirsearch* dirpath, Task* task); // The length of the magic string at the start of an archive. static const int sarmag = 8; @@ -65,6 +175,9 @@ class Archive // The string expected at the end of an archive member header. static const char arfmag[2]; + // Name of 64-bit symbol table member. + static const char sym64name[7]; + // The name of the object. This is the name used on the command // line; e.g., if "-lgcc" is on the command line, this will be // "gcc". @@ -72,14 +185,14 @@ class Archive name() const { return this->name_; } - // The file name. - const std::string& - filename() const - { return this->input_file_->filename(); } + // The input file. + const Input_file* + input_file() const + { return this->input_file_; } // Set up the archive: read the symbol map. void - setup(Input_objects*); + setup(); // Get a reference to the underlying file. File_read& @@ -131,9 +244,13 @@ class Archive // Select members from the archive as needed and add them to the // link. - void + bool add_symbols(Symbol_table*, Layout*, Input_objects*, Mapfile*); + // Return whether the archive defines the symbol. + bool + defines_symbol(Symbol*) const; + // Dump statistical information to stderr. static void print_stats(); @@ -142,10 +259,25 @@ class Archive size_t count_members(); + // Return the no-export flag. + bool + no_export() + { return this->no_export_; } + private: Archive(const Archive&); Archive& operator=(const Archive&); + // The file name. + const std::string& + do_filename() const + { return this->input_file_->filename(); } + + // The modification time of the archive file. + Timespec + do_get_mtime() + { return this->file().get_mtime(); } + struct Archive_header; // Total number of archives seen. @@ -161,6 +293,7 @@ class Archive { return this->input_file_->file().get_view(0, start, size, aligned, cache); } // Read the archive symbol map. + template void read_armap(off_t start, section_size_type size); @@ -182,33 +315,36 @@ class Archive // within that file (0 if not a nested archive), and *MEMBER_NAME // to the name of the archive member. Return TRUE on success. bool - get_file_and_offset(off_t off, Input_objects* input_objects, - Input_file** input_file, off_t* memoff, - std::string* member_name); + get_file_and_offset(off_t off, Input_file** input_file, off_t* memoff, + off_t* memsize, std::string* member_name); - // Return an ELF object for the member at offset OFF. Set *MEMBER_NAME to - // the name of the member. + // Return an ELF object for the member at offset OFF. Object* - get_elf_object_for_member(off_t off, Input_objects* input_objects); + get_elf_object_for_member(off_t off, bool*); // Read the symbols from all the archive members in the link. void - read_all_symbols(Input_objects* input_objects); + read_all_symbols(); // Read the symbols from an archive member in the link. OFF is the file // offset of the member header. void - read_symbols(Input_objects* input_objects, off_t off); + read_symbols(off_t off); // Include all the archive members in the link. - void + bool include_all_members(Symbol_table*, Layout*, Input_objects*, Mapfile*); // Include an archive member in the link. - void + bool include_member(Symbol_table*, Layout*, Input_objects*, off_t off, Mapfile*, Symbol*, const char* why); + // Return whether we found this archive by searching a directory. + bool + searched_for() const + { return this->input_file_->will_search_for(); } + // Iterate over archive members. class const_iterator; @@ -220,6 +356,10 @@ class Archive friend class const_iterator; + // Iterator for unused global symbols in the library. + void + do_for_all_unused_symbols(Symbol_visitor_base* v) const; + // An entry in the archive map of symbols to object files. struct Armap_entry { @@ -229,21 +369,6 @@ class Archive off_t file_offset; }; - // An entry in the archive map of offsets to members. - struct Archive_member - { - Archive_member() - : obj_(NULL), sd_(NULL) - { } - Archive_member(Object* obj, Read_symbols_data* sd) - : obj_(obj), sd_(sd) - { } - // The object file. - Object* obj_; - // The data to pass from read_symbols() to add_symbols(). - Read_symbols_data* sd_; - }; - // A simple hash code for off_t values. class Seen_hash { @@ -274,14 +399,18 @@ class Archive std::map members_; // True if this is a thin archive. const bool is_thin_archive_; + // True if we have included at least one object from this archive. + bool included_member_; // Table of nested archives, indexed by filename. Nested_archive_table nested_archives_; // The directory search path. Dirsearch* dirpath_; - // The task reading this archive. - Task *task_; // Number of members in this archive; unsigned int num_members_; + // True if we exclude this library archive from automatic export. + bool no_export_; + // True if this library has been included as a --whole-archive. + bool included_all_members_; }; // This class is used to read an archive and pick out the desired @@ -291,13 +420,17 @@ class Add_archive_symbols : public Task { public: Add_archive_symbols(Symbol_table* symtab, Layout* layout, - Input_objects* input_objects, Mapfile* mapfile, + Input_objects* input_objects, Dirsearch* dirpath, + int dirindex, Mapfile* mapfile, + const Input_argument* input_argument, Archive* archive, Input_group* input_group, Task_token* this_blocker, Task_token* next_blocker) : symtab_(symtab), layout_(layout), input_objects_(input_objects), - mapfile_(mapfile), archive_(archive), input_group_(input_group), - this_blocker_(this_blocker), next_blocker_(next_blocker) + dirpath_(dirpath), dirindex_(dirindex), mapfile_(mapfile), + input_argument_(input_argument), archive_(archive), + input_group_(input_group), this_blocker_(this_blocker), + next_blocker_(next_blocker) { } ~Add_archive_symbols(); @@ -325,13 +458,118 @@ class Add_archive_symbols : public Task Symbol_table* symtab_; Layout* layout_; Input_objects* input_objects_; + Dirsearch* dirpath_; + int dirindex_; Mapfile* mapfile_; + const Input_argument* input_argument_; Archive* archive_; Input_group* input_group_; Task_token* this_blocker_; Task_token* next_blocker_; }; +// This class represents the files surrounded by a --start-lib ... --end-lib. + +class Lib_group : public Library_base +{ + public: + Lib_group(const Input_file_lib* lib, Task* task); + + // Select members from the lib group as needed and add them to the link. + void + add_symbols(Symbol_table*, Layout*, Input_objects*); + + // Include a member of the lib group in the link. + void + include_member(Symbol_table*, Layout*, Input_objects*, const Archive_member&); + + Archive_member* + get_member(int i) + { + return &this->members_[i]; + } + + // Total number of archives seen. + static unsigned int total_lib_groups; + // Total number of archive members seen. + static unsigned int total_members; + // Number of archive members loaded. + static unsigned int total_members_loaded; + + // Dump statistical information to stderr. + static void + print_stats(); + + private: + // The file name. + const std::string& + do_filename() const; + + // A Lib_group does not have a modification time, since there is no + // real library file. + Timespec + do_get_mtime() + { return Timespec(0, 0); } + + // Iterator for unused global symbols in the library. + void + do_for_all_unused_symbols(Symbol_visitor_base*) const; + + // Table of the objects in the group. + std::vector members_; +}; + +// This class is used to pick out the desired elements and add them to the link. + +class Add_lib_group_symbols : public Task +{ + public: + Add_lib_group_symbols(Symbol_table* symtab, Layout* layout, + Input_objects* input_objects, + Lib_group* lib, Task_token* next_blocker) + : symtab_(symtab), layout_(layout), input_objects_(input_objects), + lib_(lib), readsyms_blocker_(NULL), this_blocker_(NULL), + next_blocker_(next_blocker) + { } + + ~Add_lib_group_symbols(); + + // The standard Task methods. + + Task_token* + is_runnable(); + + void + locks(Task_locker*); + + void + run(Workqueue*); + + // Set the blocker to use for this task. + void + set_blocker(Task_token* readsyms_blocker, Task_token* this_blocker) + { + gold_assert(this->readsyms_blocker_ == NULL && this->this_blocker_ == NULL); + this->readsyms_blocker_ = readsyms_blocker; + this->this_blocker_ = this_blocker; + } + + std::string + get_name() const + { + return "Add_lib_group_symbols"; + } + + private: + Symbol_table* symtab_; + Layout* layout_; + Input_objects* input_objects_; + Lib_group* lib_; + Task_token* readsyms_blocker_; + Task_token* this_blocker_; + Task_token* next_blocker_; +}; + } // End namespace gold. #endif // !defined(GOLD_ARCHIVE_H)