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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.20.1/] [gold/] [target-select.h] - Rev 438
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// target-select.h -- select a target for an object file -*- C++ -*- // Copyright 2006, 2007, 2008 Free Software Foundation, Inc. // Written by Ian Lance Taylor <iant@google.com>. // This file is part of gold. // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; either version 3 of the License, or // (at your option) any later version. // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, // MA 02110-1301, USA. #ifndef GOLD_TARGET_SELECT_H #define GOLD_TARGET_SELECT_H #include <vector> #include "gold-threads.h" namespace gold { class Target; // We want to avoid a master list of targets, which implies using a // global constructor. And we also want the program to start up as // quickly as possible, which implies avoiding global constructors. // We compromise on a very simple global constructor. We use a target // selector, which specifies an ELF machine number and a recognition // function. We use global constructors to build a linked list of // target selectors--a simple pointer list, not a std::list. class Target_selector { public: // Create a target selector for a specific machine number, size (32 // or 64), and endianness. The machine number can be EM_NONE to // test for any machine number. BFD_NAME is the name of the target // used by the GNU linker, for backward compatibility; it may be // NULL. Target_selector(int machine, int size, bool is_big_endian, const char* bfd_name); virtual ~Target_selector() { } // If we can handle this target, return a pointer to a target // structure. The size and endianness are known. Target* recognize(int machine, int osabi, int abiversion) { return this->do_recognize(machine, osabi, abiversion); } // If NAME matches the target, return a pointer to a target // structure. Target* recognize_by_name(const char* name) { return this->do_recognize_by_name(name); } // Push all supported names onto the vector. This is only used for // help output. void supported_names(std::vector<const char*>* names) { this->do_supported_names(names); } // Return the next Target_selector in the linked list. Target_selector* next() const { return this->next_; } // Return the machine number this selector is looking for. This can // be EM_NONE to match any machine number, in which case the // do_recognize hook will be responsible for matching the machine // number. int machine() const { return this->machine_; } // Return the size this is looking for (32 or 64). int get_size() const { return this->size_; } // Return the endianness this is looking for. bool is_big_endian() const { return this->is_big_endian_; } // Return the BFD name. This may return NULL, in which case the // do_recognize_by_name hook will be responsible for matching the // BFD name. const char* bfd_name() const { return this->bfd_name_; } protected: // Return an instance of the real target. This must be implemented // by the child class. virtual Target* do_instantiate_target() = 0; // Recognize an object file given a machine code, OSABI code, and // ELF version value. When this is called we already know that they // match the machine_, size_, and is_big_endian_ fields. The child // class may implement a different version of this to do additional // checks, or to check for multiple machine codes if the machine_ // field is EM_NONE. virtual Target* do_recognize(int, int, int) { return this->instantiate_target(); } // Recognize a target by name. When this is called we already know // that the name matches (or that the bfd_name_ field is NULL). The // child class may implement a different version of this to // recognize more than one name. virtual Target* do_recognize_by_name(const char*) { return this->instantiate_target(); } // Return a list of supported BFD names. The child class may // implement a different version of this to handle more than one // name. virtual void do_supported_names(std::vector<const char*>* names) { gold_assert(this->bfd_name_ != NULL); names->push_back(this->bfd_name_); } // Instantiate the target and return it. Target* instantiate_target(); private: // ELF machine code. const int machine_; // Target size--32 or 64. const int size_; // Whether the target is big endian. const bool is_big_endian_; // BFD name of target, for compatibility. const char* const bfd_name_; // Next entry in list built at global constructor time. Target_selector* next_; // The singleton Target structure--this points to an instance of the // real implementation. Target* instantiated_target_; // Lock to make sure that we don't instantiate the target more than // once. Lock* lock_; // We only want to initialize the lock_ pointer once. Initialize_lock initialize_lock_; }; // Select the target for an ELF file. extern Target* select_target(int machine, int size, bool big_endian, int osabi, int abiversion); // Select a target using a BFD name. extern Target* select_target_by_name(const char* name); // Fill in a vector with the list of supported targets. This returns // a list of BFD names. extern void supported_target_names(std::vector<const char*>*); } // End namespace gold. #endif // !defined(GOLD_TARGET_SELECT_H)
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