74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
/* Copyright (C) 2010 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_AUTOROOTERS
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#define INCLUDED_AUTOROOTERS
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#include "scriptinterface/ScriptTypes.h"
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#include "js/jsapi.h"
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// Exception-safety and GC-safety wrapper for JSIdArray
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// (TODO: it'd be nicer to use the existing js::AutoIdArray but currently that
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// requires a load of semi-private SpiderMonkey headers that cause a load of compile warnings)
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class IdArrayWrapper
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{
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JSContext* m_cx;
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JSIdArray* m_ida;
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public:
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IdArrayWrapper(JSContext* cx, JSIdArray* ida) :
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m_cx(cx), m_ida(ida)
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{
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for (jsint i = 0; i < m_ida->length; ++i)
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if (!JS_AddRoot(m_cx, &m_ida->vector[i]))
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debug_warn(L"JS_AddRoot failed");
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}
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~IdArrayWrapper()
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{
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for (jsint i = 0; i < m_ida->length; ++i)
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if (!JS_RemoveRoot(m_cx, &m_ida->vector[i]))
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debug_warn(L"JS_RemoveRoot failed");
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JS_DestroyIdArray(m_cx, m_ida);
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}
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};
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/**
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* Helper for rooting large groups of script values.
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* Construct this object, push values into it, and they will all be rooted until this
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* object is destroyed.
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* Many of these objects can be used at once, but their lifetimes must be correctly nested.
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*/
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class AutoGCRooter
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{
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NONCOPYABLE(AutoGCRooter);
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public:
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AutoGCRooter(ScriptInterface& scriptInterface);
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~AutoGCRooter();
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void Push(JSObject* obj) { m_Objects.push_back(obj); }
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void Trace(JSTracer* trc);
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private:
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ScriptInterface& m_ScriptInterface;
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AutoGCRooter* m_Previous;
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std::vector<JSObject*> m_Objects;
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// TODO: add vectors of other value types
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};
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#endif // INCLUDED_AUTOROOTERS
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