mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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353 lines
12 KiB
C++
353 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsJSEnvironment_h
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#define nsJSEnvironment_h
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#include "nsIScriptContext.h"
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#include "nsIScriptRuntime.h"
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#include "nsIScriptGlobalObject.h"
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#include "nsCOMPtr.h"
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#include "jsapi.h"
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#include "jsfriendapi.h"
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#include "nsIObserver.h"
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#include "nsIXPCScriptNotify.h"
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#include "prtime.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsIXPConnect.h"
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#include "nsIArray.h"
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#include "mozilla/Attributes.h"
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class nsIXPConnectJSObjectHolder;
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class nsRootedJSValueArray;
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class nsScriptNameSpaceManager;
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namespace mozilla {
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template <class> class Maybe;
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}
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// The amount of time we wait between a request to GC (due to leaving
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// a page) and doing the actual GC.
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#define NS_GC_DELAY 4000 // ms
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class nsJSContext : public nsIScriptContext,
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public nsIXPCScriptNotify
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{
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public:
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nsJSContext(JSRuntime *aRuntime);
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virtual ~nsJSContext();
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(nsJSContext,
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nsIScriptContext)
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virtual nsIScriptObjectPrincipal* GetObjectPrincipal();
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virtual void SetGlobalObject(nsIScriptGlobalObject* aGlobalObject)
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{
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mGlobalObjectRef = aGlobalObject;
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}
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virtual nsresult EvaluateString(const nsAString& aScript,
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JSObject* aScopeObject,
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nsIPrincipal *principal,
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nsIPrincipal *originPrincipal,
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const char *aURL,
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PRUint32 aLineNo,
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JSVersion aVersion,
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nsAString *aRetValue,
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bool* aIsUndefined);
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virtual nsresult EvaluateStringWithValue(const nsAString& aScript,
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JSObject* aScopeObject,
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nsIPrincipal* aPrincipal,
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const char* aURL,
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PRUint32 aLineNo,
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PRUint32 aVersion,
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JS::Value* aRetValue,
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bool* aIsUndefined);
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virtual nsresult CompileScript(const PRUnichar* aText,
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PRInt32 aTextLength,
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nsIPrincipal *principal,
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const char *aURL,
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PRUint32 aLineNo,
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PRUint32 aVersion,
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nsScriptObjectHolder<JSScript>& aScriptObject);
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virtual nsresult ExecuteScript(JSScript* aScriptObject,
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JSObject* aScopeObject,
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nsAString* aRetValue,
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bool* aIsUndefined);
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virtual nsresult CompileEventHandler(nsIAtom *aName,
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PRUint32 aArgCount,
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const char** aArgNames,
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const nsAString& aBody,
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const char *aURL, PRUint32 aLineNo,
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PRUint32 aVersion,
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nsScriptObjectHolder<JSObject>& aHandler);
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virtual nsresult CallEventHandler(nsISupports* aTarget, JSObject* aScope,
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JSObject* aHandler,
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nsIArray *argv, nsIVariant **rv);
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virtual nsresult BindCompiledEventHandler(nsISupports *aTarget,
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JSObject *aScope,
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JSObject* aHandler,
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nsScriptObjectHolder<JSObject>& aBoundHandler);
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virtual nsresult CompileFunction(JSObject* aTarget,
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const nsACString& aName,
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PRUint32 aArgCount,
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const char** aArgArray,
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const nsAString& aBody,
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const char* aURL,
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PRUint32 aLineNo,
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PRUint32 aVersion,
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bool aShared,
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JSObject** aFunctionObject);
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virtual nsIScriptGlobalObject *GetGlobalObject();
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inline nsIScriptGlobalObject *GetGlobalObjectRef() { return mGlobalObjectRef; };
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virtual JSContext* GetNativeContext();
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virtual JSObject* GetNativeGlobal();
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virtual nsresult InitContext();
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virtual bool IsContextInitialized();
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virtual void ScriptEvaluated(bool aTerminated);
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virtual void SetTerminationFunction(nsScriptTerminationFunc aFunc,
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nsIDOMWindow* aRef);
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virtual bool GetScriptsEnabled();
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virtual void SetScriptsEnabled(bool aEnabled, bool aFireTimeouts);
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virtual nsresult SetProperty(JSObject* aTarget, const char* aPropName, nsISupports* aVal);
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virtual bool GetProcessingScriptTag();
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virtual void SetProcessingScriptTag(bool aResult);
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virtual bool GetExecutingScript();
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virtual void SetGCOnDestruction(bool aGCOnDestruction);
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virtual nsresult InitClasses(JSObject* aGlobalObj);
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virtual void WillInitializeContext();
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virtual void DidInitializeContext();
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virtual nsresult Serialize(nsIObjectOutputStream* aStream, JSScript* aScriptObject);
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virtual nsresult Deserialize(nsIObjectInputStream* aStream,
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nsScriptObjectHolder<JSScript>& aResult);
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virtual nsresult DropScriptObject(void *object);
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virtual nsresult HoldScriptObject(void *object);
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virtual void EnterModalState();
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virtual void LeaveModalState();
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NS_DECL_NSIXPCSCRIPTNOTIFY
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static void LoadStart();
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static void LoadEnd();
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static void GarbageCollectNow(js::gcreason::Reason reason,
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PRUint32 aGckind,
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bool aGlobal);
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static void ShrinkGCBuffersNow();
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// If aExtraForgetSkippableCalls is -1, forgetSkippable won't be
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// called even if the previous collection was GC.
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static void CycleCollectNow(nsICycleCollectorListener *aListener = nsnull,
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PRInt32 aExtraForgetSkippableCalls = 0,
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bool aForced = true);
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static void PokeGC(js::gcreason::Reason aReason, int aDelay = 0);
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static void KillGCTimer();
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static void PokeShrinkGCBuffers();
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static void KillShrinkGCBuffersTimer();
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static void MaybePokeCC();
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static void KillCCTimer();
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static void KillFullGCTimer();
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static void KillInterSliceGCTimer();
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virtual void GC(js::gcreason::Reason aReason);
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static PRUint32 CleanupsSinceLastGC();
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nsIScriptGlobalObject* GetCachedGlobalObject()
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{
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// Verify that we have a global so that this
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// does always return a null when GetGlobalObject() is null.
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JSObject* global = JS_GetGlobalObject(mContext);
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return global ? mGlobalObjectRef.get() : nsnull;
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}
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protected:
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nsresult InitializeExternalClasses();
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// Helper to convert xpcom datatypes to jsvals.
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nsresult ConvertSupportsTojsvals(nsISupports *aArgs,
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JSObject *aScope,
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PRUint32 *aArgc,
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jsval **aArgv,
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mozilla::Maybe<nsRootedJSValueArray> &aPoolRelease);
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nsresult AddSupportsPrimitiveTojsvals(nsISupports *aArg, jsval *aArgv);
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// given an nsISupports object (presumably an event target or some other
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// DOM object), get (or create) the JSObject wrapping it.
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nsresult JSObjectFromInterface(nsISupports *aSup, JSObject *aScript,
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JSObject **aRet);
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// Report the pending exception on our mContext, if any. This
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// function will set aside the frame chain on mContext before
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// reporting.
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void ReportPendingException();
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private:
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void DestroyJSContext();
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nsrefcnt GetCCRefcnt();
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JSContext *mContext;
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bool mActive;
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protected:
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struct TerminationFuncHolder;
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friend struct TerminationFuncHolder;
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struct TerminationFuncClosure
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{
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TerminationFuncClosure(nsScriptTerminationFunc aFunc,
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nsISupports* aArg,
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TerminationFuncClosure* aNext) :
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mTerminationFunc(aFunc),
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mTerminationFuncArg(aArg),
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mNext(aNext)
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{
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}
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~TerminationFuncClosure()
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{
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delete mNext;
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}
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nsScriptTerminationFunc mTerminationFunc;
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nsCOMPtr<nsISupports> mTerminationFuncArg;
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TerminationFuncClosure* mNext;
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};
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struct TerminationFuncHolder
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{
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TerminationFuncHolder(nsJSContext* aContext)
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: mContext(aContext),
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mTerminations(aContext->mTerminations)
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{
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aContext->mTerminations = nsnull;
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}
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~TerminationFuncHolder()
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{
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// Have to be careful here. mContext might have picked up new
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// termination funcs while the script was evaluating. Prepend whatever
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// we have to the current termination funcs on the context (since our
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// termination funcs were posted first).
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if (mTerminations) {
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TerminationFuncClosure* cur = mTerminations;
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while (cur->mNext) {
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cur = cur->mNext;
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}
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cur->mNext = mContext->mTerminations;
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mContext->mTerminations = mTerminations;
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}
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}
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nsJSContext* mContext;
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TerminationFuncClosure* mTerminations;
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};
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TerminationFuncClosure* mTerminations;
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private:
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bool mIsInitialized;
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bool mScriptsEnabled;
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bool mGCOnDestruction;
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bool mProcessingScriptTag;
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PRUint32 mExecuteDepth;
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PRUint32 mDefaultJSOptions;
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PRTime mOperationCallbackTime;
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PRTime mModalStateTime;
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PRUint32 mModalStateDepth;
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nsJSContext *mNext;
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nsJSContext **mPrev;
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// mGlobalObjectRef ensures that the outer window stays alive as long as the
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// context does. It is eventually collected by the cycle collector.
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nsCOMPtr<nsIScriptGlobalObject> mGlobalObjectRef;
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static int JSOptionChangedCallback(const char *pref, void *data);
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static JSBool DOMOperationCallback(JSContext *cx);
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};
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class nsIJSRuntimeService;
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class nsJSRuntime MOZ_FINAL : public nsIScriptRuntime
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{
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public:
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// let people who can see us use our runtime for convenience.
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static JSRuntime *sRuntime;
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public:
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// nsISupports
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NS_DECL_ISUPPORTS
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virtual already_AddRefed<nsIScriptContext> CreateContext();
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virtual nsresult ParseVersion(const nsString &aVersionStr, PRUint32 *flags);
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virtual nsresult DropScriptObject(void *object);
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virtual nsresult HoldScriptObject(void *object);
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static void Startup();
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static void Shutdown();
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// Setup all the statics etc - safe to call multiple times after Startup()
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static nsresult Init();
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// Get the NameSpaceManager, creating if necessary
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static nsScriptNameSpaceManager* GetNameSpaceManager();
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};
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// An interface for fast and native conversion to/from nsIArray. If an object
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// supports this interface, JS can reach directly in for the argv, and avoid
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// nsISupports conversion. If this interface is not supported, the object will
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// be queried for nsIArray, and everything converted via xpcom objects.
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#define NS_IJSARGARRAY_IID \
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{ 0xb6acdac8, 0xf5c6, 0x432c, \
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{ 0xa8, 0x6e, 0x33, 0xee, 0xb1, 0xb0, 0xcd, 0xdc } }
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class nsIJSArgArray : public nsIArray
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{
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_IJSARGARRAY_IID)
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// Bug 312003 describes why this must be "void **", but after calling argv
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// may be cast to jsval* and the args found at:
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// ((jsval*)argv)[0], ..., ((jsval*)argv)[argc - 1]
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virtual nsresult GetArgs(PRUint32 *argc, void **argv) = 0;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIJSArgArray, NS_IJSARGARRAY_IID)
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/* factory functions */
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nsresult NS_CreateJSRuntime(nsIScriptRuntime **aRuntime);
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/* prototypes */
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void NS_ScriptErrorReporter(JSContext *cx, const char *message, JSErrorReport *report);
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JSObject* NS_DOMReadStructuredClone(JSContext* cx,
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JSStructuredCloneReader* reader, uint32_t tag,
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uint32_t data, void* closure);
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JSBool NS_DOMWriteStructuredClone(JSContext* cx,
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JSStructuredCloneWriter* writer,
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JSObject* obj, void *closure);
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void NS_DOMStructuredCloneError(JSContext* cx, uint32_t errorid);
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#endif /* nsJSEnvironment_h */
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