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https://gitea.wildfiregames.com/0ad/0ad
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25490bfec3
- Check for pending exceptions after function calls and script executions. - Call LOGERROR instead of JS_ReportError when there is a conversion error in FromJSVal, since that can only be called from C++ (where JS errors don't really make sense). Instead, C++ callers of FromJSVal should handle the failure and, themselves, either report an error or simply do something else. - Wrap JS_ReportError since that makes updating it later easier. This isn't a systematical fix since ToJSVal also ought return a boolean for failures, and we probably should trigger errors instead of warnings on 'implicit' conversions, rather a preparation diff. Part of the SM52 migration, stage: SM45 compatible (actually SM52 incompatible, too). Based on a patch by: Itms Comments by: Vladislavbelov, Stan` Refs #742, #4893 Differential Revision: https://code.wildfiregames.com/D3093 This was SVN commit r24187.
104 lines
3.9 KiB
C++
104 lines
3.9 KiB
C++
/* Copyright (C) 2020 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_SCRIPTCONTEXT
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#define INCLUDED_SCRIPTCONTEXT
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#include "ScriptTypes.h"
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#include "ScriptExtraHeaders.h"
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#include <sstream>
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constexpr int STACK_CHUNK_SIZE = 8192;
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// Those are minimal defaults. The runtime for the main game is larger and GCs upon a larger growth.
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constexpr int DEFAULT_CONTEXT_SIZE = 16 * 1024 * 1024;
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constexpr int DEFAULT_HEAP_GROWTH_BYTES_GCTRIGGER = 2 * 1024 * 1024;
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/**
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* Abstraction around a SpiderMonkey JSRuntime/JSContext.
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*
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* A single ScriptContext, with the associated runtime and context,
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* should only be used on a single thread.
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*
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* (One means to share data between threads and contexts is to create
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* a ScriptInterface::StructuredClone.)
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*/
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class ScriptContext
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{
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public:
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ScriptContext(int contextSize, int heapGrowthBytesGCTrigger);
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~ScriptContext();
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/**
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* Returns a context, in which any number of ScriptInterfaces compartments can live.
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* Each context should only ever be used on a single thread.
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* @param parentContext Parent context from the parent thread, with which we share some thread-safe data
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* @param contextSize Maximum size in bytes of the new context
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* @param heapGrowthBytesGCTrigger Size in bytes of cumulated allocations after which a GC will be triggered
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*/
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static shared_ptr<ScriptContext> CreateContext(
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int contextSize = DEFAULT_CONTEXT_SIZE,
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int heapGrowthBytesGCTrigger = DEFAULT_HEAP_GROWTH_BYTES_GCTRIGGER);
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/**
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* MaybeIncrementalGC tries to determine whether a context-wide garbage collection would free up enough memory to
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* be worth the amount of time it would take. It does this with our own logic and NOT some predefined JSAPI logic because
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* such functionality currently isn't available out of the box.
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* It does incremental GC which means it will collect one slice each time it's called until the garbage collection is done.
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* This can and should be called quite regularly. The delay parameter allows you to specify a minimum time since the last GC
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* in seconds (the delay should be a fraction of a second in most cases though).
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* It will only start a new incremental GC or another GC slice if this time is exceeded. The user of this function is
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* responsible for ensuring that GC can run with a small enough delay to get done with the work.
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*/
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void MaybeIncrementalGC(double delay);
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void ShrinkingGC();
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/**
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* This is used to keep track of compartments which should be prepared for a GC.
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*/
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void RegisterCompartment(JSCompartment* cmpt);
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void UnRegisterCompartment(JSCompartment* cmpt);
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JSRuntime* GetJSRuntime() const { return m_rt; }
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/**
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* GetGeneralJSContext returns the context without starting a GC request and without
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* entering any compartment. It should only be used in specific situations, such as
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* creating a new compartment, or as an unsafe alternative to GetJSRuntime.
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* If you need the compartmented context of a ScriptInterface, you should create a
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* ScriptRequest and use the context from that.
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*/
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JSContext* GetGeneralJSContext() const { return m_cx; }
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private:
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JSRuntime* m_rt;
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JSContext* m_cx;
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void PrepareCompartmentsForIncrementalGC() const;
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std::list<JSCompartment*> m_Compartments;
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int m_ContextSize;
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int m_HeapGrowthBytesGCTrigger;
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int m_LastGCBytes;
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double m_LastGCCheck;
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};
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#endif // INCLUDED_SCRIPTCONTEXT
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