vladislavbelov
ffc4a56b9f
Fixes #6846 Differential Revision: https://code.wildfiregames.com/D5185 This was SVN commit r27965.
102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
/* Copyright (C) 2021 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. 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 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. 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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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef INCLUDED_SCRIPTREQUEST
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#define INCLUDED_SCRIPTREQUEST
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#include "scriptinterface/ScriptForward.h"
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// Ignore warnings in SM headers.
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#if GCC_VERSION || CLANG_VERSION
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wunused-parameter"
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# pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
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#elif MSC_VERSION
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# pragma warning(push, 1)
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#endif
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#include "js/RootingAPI.h"
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#if GCC_VERSION || CLANG_VERSION
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# pragma GCC diagnostic pop
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#elif MSC_VERSION
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# pragma warning(pop)
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#endif
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#include <memory>
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class ScriptInterface;
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/**
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* Spidermonkey maintains some 'local' state via the JSContext* object.
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* This object is an argument to most JSAPI functions.
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* Furthermore, this state is Realm (~ global) dependent. For many reasons, including GC safety,
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* The JSContext* Realm must be set up correctly when accessing it.
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* 'Entering' and 'Leaving' realms must be done in a LIFO manner.
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* SM recommends using JSAutoRealm, which provides an RAII option.
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*
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* ScriptRequest combines both of the above in a single convenient package,
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* providing safe access to the JSContext*, the global object, and ensuring that the proper realm has been entered.
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* Most scriptinterface/ functions will take a ScriptRequest, to ensure proper rooting. You may sometimes
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* have to create one from a ScriptInterface.
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*
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* Be particularly careful when manipulating several script interfaces.
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*/
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class ScriptRequest
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{
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ScriptRequest() = delete;
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ScriptRequest(const ScriptRequest& rq) = delete;
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ScriptRequest& operator=(const ScriptRequest& rq) = delete;
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public:
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/**
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* NB: the definitions are in scriptinterface.cpp, because these access members of the PImpled
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* implementation of ScriptInterface, and that seemed more convenient.
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*/
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ScriptRequest(const ScriptInterface& scriptInterface);
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ScriptRequest(const ScriptInterface* scriptInterface) : ScriptRequest(*scriptInterface) {}
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ScriptRequest(std::shared_ptr<ScriptInterface> scriptInterface) : ScriptRequest(*scriptInterface) {}
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~ScriptRequest();
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/**
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* Create a script request from a JSContext.
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* This can be used to get the script interface in a JSNative function.
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* In general, you shouldn't have to rely on this otherwise.
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*/
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ScriptRequest(JSContext* cx);
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/**
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* Return the scriptInterface active when creating this ScriptRequest.
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* Note that this is multi-request safe: even if another ScriptRequest is created,
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* it will point to the original scriptInterface, and thus can be used to re-enter the realm.
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*/
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const ScriptInterface& GetScriptInterface() const;
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JS::Value globalValue() const;
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// Note that JSContext actually changes behind the scenes when creating another ScriptRequest for another realm,
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// so be _very_ careful when juggling between different realms.
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JSContext* cx;
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JS::HandleObject glob;
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JS::HandleObject nativeScope;
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private:
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const ScriptInterface& m_ScriptInterface;
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JS::Realm* m_FormerRealm;
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};
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#endif // INCLUDED_SCRIPTREQUEST
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