2008-09-19 22:54:57 +00:00
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// plugin.h -- plugin manager for gold -*- C++ -*-
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2009-01-15 01:29:25 +00:00
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// Copyright 2008, 2009 Free Software Foundation, Inc.
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2008-09-19 22:54:57 +00:00
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// Written by Cary Coutant <ccoutant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#ifndef GOLD_PLUGIN_H
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#define GOLD_PLUGIN_H
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#include <list>
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#include <string>
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#include "object.h"
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#include "plugin-api.h"
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#include "workqueue.h"
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namespace gold
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{
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class General_options;
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class Input_file;
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class Input_objects;
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class Symbol_table;
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class Layout;
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class Dirsearch;
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class Mapfile;
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class Task_token;
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class Pluginobj;
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// This class represents a single plugin library.
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class Plugin
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{
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public:
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Plugin(const char* filename)
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: handle_(NULL),
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filename_(filename),
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args_(),
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claim_file_handler_(NULL),
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all_symbols_read_handler_(NULL),
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cleanup_handler_(NULL)
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{ }
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~Plugin()
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{ }
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// Load the library and call its entry point.
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void
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load();
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// Call the claim-file handler.
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bool
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claim_file(struct ld_plugin_input_file *plugin_input_file);
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// Call the all-symbols-read handler.
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void
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all_symbols_read();
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// Call the cleanup handler.
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void
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cleanup();
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// Register a claim-file handler.
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void
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set_claim_file_handler(ld_plugin_claim_file_handler handler)
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{ this->claim_file_handler_ = handler; }
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// Register an all-symbols-read handler.
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void
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set_all_symbols_read_handler(ld_plugin_all_symbols_read_handler handler)
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{ this->all_symbols_read_handler_ = handler; }
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// Register a claim-file handler.
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void
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set_cleanup_handler(ld_plugin_cleanup_handler handler)
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{ this->cleanup_handler_ = handler; }
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// Add an argument
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void
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add_option(const char *arg)
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{
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this->args_.push_back(arg);
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}
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private:
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Plugin(const Plugin&);
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Plugin& operator=(const Plugin&);
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// The shared library handle returned by dlopen.
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void* handle_;
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// The argument string given to --plugin.
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std::string filename_;
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// The list of argument string given to --plugin-opt.
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std::vector<std::string> args_;
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// The plugin's event handlers.
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ld_plugin_claim_file_handler claim_file_handler_;
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ld_plugin_all_symbols_read_handler all_symbols_read_handler_;
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ld_plugin_cleanup_handler cleanup_handler_;
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};
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// A manager class for plugins.
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class Plugin_manager
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{
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public:
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Plugin_manager(const General_options& options)
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: plugins_(), objects_(), deferred_layout_objects_(), input_file_(NULL),
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plugin_input_file_(), in_replacement_phase_(false), cleanup_done_(false),
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options_(options), workqueue_(NULL), task_(NULL), input_objects_(NULL),
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symtab_(NULL), layout_(NULL), dirpath_(NULL), mapfile_(NULL),
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this_blocker_(NULL)
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{ this->current_ = plugins_.end(); }
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~Plugin_manager();
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// Add a plugin library.
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void
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add_plugin(const char* filename)
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{ this->plugins_.push_back(new Plugin(filename)); }
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// Add an argument to the current plugin.
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void
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add_plugin_option(const char* opt)
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{
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Plugin* last = this->plugins_.back();
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last->add_option(opt);
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}
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// Load all plugin libraries.
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void
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load_plugins();
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// Call the plugin claim-file handlers in turn to see if any claim the file.
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Pluginobj*
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claim_file(Input_file *input_file, off_t offset, off_t filesize);
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// Call the all-symbols-read handlers.
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void
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all_symbols_read(Workqueue* workqueue, Task* task,
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Input_objects* input_objects, Symbol_table* symtab,
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Layout* layout, Dirsearch* dirpath, Mapfile* mapfile,
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Task_token** last_blocker);
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2008-12-24 06:17:18 +00:00
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// Run deferred layout.
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void
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layout_deferred_objects();
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// Call the cleanup handlers.
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void
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cleanup();
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// Register a claim-file handler.
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void
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set_claim_file_handler(ld_plugin_claim_file_handler handler)
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{
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gold_assert(this->current_ != plugins_.end());
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(*this->current_)->set_claim_file_handler(handler);
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}
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// Register an all-symbols-read handler.
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void
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set_all_symbols_read_handler(ld_plugin_all_symbols_read_handler handler)
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{
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gold_assert(this->current_ != plugins_.end());
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(*this->current_)->set_all_symbols_read_handler(handler);
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}
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// Register a claim-file handler.
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void
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set_cleanup_handler(ld_plugin_cleanup_handler handler)
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{
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gold_assert(this->current_ != plugins_.end());
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(*this->current_)->set_cleanup_handler(handler);
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}
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// Make a new Pluginobj object. This is called when the plugin calls
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// the add_symbols API.
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Pluginobj*
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make_plugin_object(unsigned int handle);
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// Return the Pluginobj associated with the given HANDLE.
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Pluginobj*
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object(unsigned int handle) const
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{
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if (handle >= this->objects_.size())
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return NULL;
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return this->objects_[handle];
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}
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// Return TRUE if any input files have been claimed by a plugin
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// and we are still in the initial input phase.
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bool
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should_defer_layout() const
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{ return !this->objects_.empty() && !this->in_replacement_phase_; }
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// Add a regular object to the deferred layout list. These are
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// objects whose layout has been deferred until after the
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// replacement files have arrived.
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void
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add_deferred_layout_object(Relobj* obj)
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{ this->deferred_layout_objects_.push_back(obj); }
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// Get input file information with an open (possibly re-opened)
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// file descriptor.
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ld_plugin_status
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get_input_file(unsigned int handle, struct ld_plugin_input_file *file);
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// Release an input file.
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ld_plugin_status
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release_input_file(unsigned int handle);
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// Add a new input file.
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ld_plugin_status
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add_input_file(char *pathname);
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// Return TRUE if we are in the replacement phase.
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bool
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in_replacement_phase() const
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{ return this->in_replacement_phase_; }
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private:
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Plugin_manager(const Plugin_manager&);
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Plugin_manager& operator=(const Plugin_manager&);
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typedef std::list<Plugin*> Plugin_list;
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typedef std::vector<Pluginobj*> Object_list;
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typedef std::vector<Relobj*> Deferred_layout_list;
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// The list of plugin libraries.
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Plugin_list plugins_;
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// A pointer to the current plugin. Used while loading plugins.
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Plugin_list::iterator current_;
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// The list of plugin objects. The index of an item in this list
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// serves as the "handle" that we pass to the plugins.
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Object_list objects_;
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// The list of regular objects whose layout has been deferred.
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Deferred_layout_list deferred_layout_objects_;
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// The file currently up for claim by the plugins.
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Input_file* input_file_;
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struct ld_plugin_input_file plugin_input_file_;
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// TRUE after the all symbols read event; indicates that we are
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// processing replacement files whose symbols should replace the
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// placeholder symbols from the Pluginobj objects.
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bool in_replacement_phase_;
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2008-12-24 06:17:18 +00:00
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// TRUE if the cleanup handlers have been called.
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bool cleanup_done_;
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const General_options& options_;
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Workqueue* workqueue_;
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Task* task_;
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Input_objects* input_objects_;
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Symbol_table* symtab_;
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Layout* layout_;
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Dirsearch* dirpath_;
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Mapfile* mapfile_;
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Task_token* this_blocker_;
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};
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// An object file claimed by a plugin. This is an abstract base class.
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// The implementation is the template class Sized_pluginobj.
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class Pluginobj : public Object
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{
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public:
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typedef std::vector<Symbol*> Symbols;
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Pluginobj(const std::string& name, Input_file* input_file, off_t offset,
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off_t filesize);
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// Fill in the symbol resolution status for the given plugin symbols.
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ld_plugin_status
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get_symbol_resolution_info(int nsyms, ld_plugin_symbol* syms) const;
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// Add symbol information to the global symbol table.
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void
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add_symbols(Symbol_table* symtab, Layout* layout)
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{ this->do_add_symbols(symtab, layout); }
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// Store the incoming symbols from the plugin for later processing.
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void
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store_incoming_symbols(int nsyms, const struct ld_plugin_symbol* syms)
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{
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this->nsyms_ = nsyms;
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this->syms_ = syms;
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}
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// Return TRUE if the comdat group with key COMDAT_KEY from this object
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// should be kept.
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bool
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include_comdat_group(std::string comdat_key, Layout* layout);
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// Return the filename.
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const std::string&
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filename() const
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{ return this->input_file()->filename(); }
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// Return the file descriptor.
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int
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descriptor()
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{ return this->input_file()->file().descriptor(); }
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// Return the size of the file or archive member.
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off_t
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filesize()
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{ return this->filesize_; }
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protected:
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// Return TRUE if this is an object claimed by a plugin.
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virtual Pluginobj*
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do_pluginobj()
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{ return this; }
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// Add symbol information to the global symbol table--implemented by
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// child class.
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virtual void
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do_add_symbols(Symbol_table*, Layout*) = 0;
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// The number of symbols provided by the plugin.
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int nsyms_;
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// The symbols provided by the plugin.
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const struct ld_plugin_symbol* syms_;
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// The entries in the symbol table for the external symbols.
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Symbols symbols_;
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private:
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// Size of the file (or archive member).
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off_t filesize_;
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// Map a comdat key symbol to a boolean indicating whether the comdat
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// group in this object with that key should be kept.
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typedef Unordered_map<std::string, bool> Comdat_map;
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Comdat_map comdat_map_;
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};
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// A plugin object, size-specific version.
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template<int size, bool big_endian>
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class Sized_pluginobj : public Pluginobj
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{
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public:
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Sized_pluginobj(const std::string& name, Input_file* input_file,
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off_t offset, off_t filesize);
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// Read the symbols.
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void
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do_read_symbols(Read_symbols_data*);
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// Lay out the input sections.
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void
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do_layout(Symbol_table*, Layout*, Read_symbols_data*);
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// Add the symbols to the symbol table.
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void
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do_add_symbols(Symbol_table*, Read_symbols_data*);
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void
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do_add_symbols(Symbol_table*, Layout*);
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// Get the size of a section.
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uint64_t
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do_section_size(unsigned int shndx);
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// Get the name of a section.
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std::string
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do_section_name(unsigned int shndx);
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// Return a view of the contents of a section.
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Object::Location
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do_section_contents(unsigned int shndx);
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// Return section flags.
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uint64_t
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do_section_flags(unsigned int shndx);
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// Return section address.
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uint64_t
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do_section_address(unsigned int shndx);
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// Return section type.
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unsigned int
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do_section_type(unsigned int shndx);
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// Return the section link field.
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unsigned int
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do_section_link(unsigned int shndx);
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// Return the section link field.
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unsigned int
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do_section_info(unsigned int shndx);
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// Return the section alignment.
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uint64_t
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do_section_addralign(unsigned int shndx);
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// Return the Xindex structure to use.
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Xindex*
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do_initialize_xindex();
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// Get symbol counts.
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void
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do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const;
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// Add placeholder symbols from a claimed file.
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ld_plugin_status
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add_symbols_from_plugin(int nsyms, const ld_plugin_symbol* syms);
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protected:
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private:
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};
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// This Task handles adding the symbols to the symbol table. These
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// tasks must be run in the same order as the arguments appear on the
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// command line.
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|
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class Add_plugin_symbols : public Task
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{
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public:
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// THIS_BLOCKER is used to prevent this task from running before the
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// one for the previous input file. NEXT_BLOCKER is used to prevent
|
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// the next task from running.
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Add_plugin_symbols(Symbol_table* symtab,
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Layout* layout,
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Pluginobj* obj,
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|
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Task_token* this_blocker,
|
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|
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Task_token* next_blocker)
|
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: symtab_(symtab), layout_(layout), obj_(obj),
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this_blocker_(this_blocker), next_blocker_(next_blocker)
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{ }
|
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|
|
~Add_plugin_symbols();
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|
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// The standard Task methods.
|
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|
|
Task_token*
|
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|
|
is_runnable();
|
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|
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void
|
|
|
|
locks(Task_locker*);
|
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|
|
void
|
|
|
|
run(Workqueue*);
|
|
|
|
|
|
|
|
std::string
|
|
|
|
get_name() const
|
|
|
|
{ return "Add_plugin_symbols " + this->obj_->name(); }
|
|
|
|
|
|
|
|
private:
|
|
|
|
Symbol_table* symtab_;
|
|
|
|
Layout* layout_;
|
|
|
|
Pluginobj* obj_;
|
|
|
|
Task_token* this_blocker_;
|
|
|
|
Task_token* next_blocker_;
|
|
|
|
};
|
|
|
|
|
|
|
|
// This Task handles handles the "all symbols read" event hook.
|
|
|
|
// The plugin may add additional input files at this time, which must
|
|
|
|
// be queued for reading.
|
|
|
|
|
|
|
|
class Plugin_hook : public Task
|
|
|
|
{
|
|
|
|
public:
|
|
|
|
Plugin_hook(const General_options& options, Input_objects* input_objects,
|
|
|
|
Symbol_table* symtab, Layout* layout, Dirsearch* dirpath,
|
|
|
|
Mapfile* mapfile, Task_token* this_blocker,
|
|
|
|
Task_token* next_blocker)
|
|
|
|
: options_(options), input_objects_(input_objects), symtab_(symtab),
|
|
|
|
layout_(layout), dirpath_(dirpath), mapfile_(mapfile),
|
|
|
|
this_blocker_(this_blocker), next_blocker_(next_blocker)
|
|
|
|
{ }
|
|
|
|
|
|
|
|
~Plugin_hook();
|
|
|
|
|
|
|
|
// The standard Task methods.
|
|
|
|
|
|
|
|
Task_token*
|
|
|
|
is_runnable();
|
|
|
|
|
|
|
|
void
|
|
|
|
locks(Task_locker*);
|
|
|
|
|
|
|
|
void
|
|
|
|
run(Workqueue*);
|
|
|
|
|
|
|
|
std::string
|
|
|
|
get_name() const
|
|
|
|
{ return "Plugin_hook"; }
|
|
|
|
|
|
|
|
private:
|
|
|
|
const General_options& options_;
|
|
|
|
Input_objects* input_objects_;
|
|
|
|
Symbol_table* symtab_;
|
|
|
|
Layout* layout_;
|
|
|
|
Dirsearch* dirpath_;
|
|
|
|
Mapfile* mapfile_;
|
|
|
|
Task_token* this_blocker_;
|
|
|
|
Task_token* next_blocker_;
|
|
|
|
};
|
|
|
|
|
|
|
|
} // End namespace gold.
|
|
|
|
|
|
|
|
#endif // !defined(GOLD_PLUGIN_H)
|