X-Git-Url: https://oss.titaniummirror.com/gitweb?p=msp430-binutils.git;a=blobdiff_plain;f=gold%2Ftarget-select.h;fp=gold%2Ftarget-select.h;h=d1cd44f229d042745426eaf35f7b315800dfb18f;hp=0000000000000000000000000000000000000000;hb=88750007d7869f178f0ba528f41efd3b74c424cf;hpb=6df9443a374e2b81278c61b8afc0a1eef7db280b diff --git a/gold/target-select.h b/gold/target-select.h new file mode 100644 index 0000000..d1cd44f --- /dev/null +++ b/gold/target-select.h @@ -0,0 +1,183 @@ +// target-select.h -- select a target for an object file -*- C++ -*- + +// Copyright 2006, 2007, 2008 Free Software Foundation, Inc. +// Written by Ian Lance Taylor . + +// 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 + +#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* 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* 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*); + +} // End namespace gold. + +#endif // !defined(GOLD_TARGET_SELECT_H)