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gecko-dev/dom/base/nsJSEnvironment.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsJSEnvironment_h
#define nsJSEnvironment_h
#include "nsIScriptContext.h"
#include "nsIScriptRuntime.h"
#include "nsCOMPtr.h"
#include "jsapi.h"
#include "nsIObserver.h"
#include "nsIXPCScriptNotify.h"
#include "prtime.h"
#include "nsCycleCollectionParticipant.h"
class nsIXPConnectJSObjectHolder;
class nsRootedJSValueArray;
class nsScriptNameSpaceManager;
namespace mozilla {
template <class> class Maybe;
}
class nsJSContext : public nsIScriptContext,
public nsIXPCScriptNotify
{
public:
nsJSContext(JSRuntime *aRuntime);
virtual ~nsJSContext();
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(nsJSContext,
nsIScriptContext)
virtual nsIScriptObjectPrincipal* GetObjectPrincipal();
virtual PRUint32 GetScriptTypeID()
{ return nsIProgrammingLanguage::JAVASCRIPT; }
virtual nsresult EvaluateString(const nsAString& aScript,
JSObject* aScopeObject,
nsIPrincipal *principal,
nsIPrincipal *originPrincipal,
const char *aURL,
PRUint32 aLineNo,
PRUint32 aVersion,
nsAString *aRetValue,
bool* aIsUndefined);
virtual nsresult EvaluateStringWithValue(const nsAString& aScript,
JSObject* aScopeObject,
nsIPrincipal* aPrincipal,
const char* aURL,
PRUint32 aLineNo,
PRUint32 aVersion,
JS::Value* aRetValue,
bool* aIsUndefined);
virtual nsresult CompileScript(const PRUnichar* aText,
PRInt32 aTextLength,
nsIPrincipal *principal,
const char *aURL,
PRUint32 aLineNo,
PRUint32 aVersion,
nsScriptObjectHolder<JSScript>& aScriptObject);
virtual nsresult ExecuteScript(JSScript* aScriptObject,
JSObject* aScopeObject,
nsAString* aRetValue,
bool* aIsUndefined);
virtual nsresult CompileEventHandler(nsIAtom *aName,
PRUint32 aArgCount,
const char** aArgNames,
const nsAString& aBody,
const char *aURL, PRUint32 aLineNo,
PRUint32 aVersion,
nsScriptObjectHolder<JSObject>& aHandler);
virtual nsresult CallEventHandler(nsISupports* aTarget, JSObject* aScope,
JSObject* aHandler,
nsIArray *argv, nsIVariant **rv);
virtual nsresult BindCompiledEventHandler(nsISupports *aTarget,
JSObject *aScope,
JSObject* aHandler,
nsScriptObjectHolder<JSObject>& aBoundHandler);
virtual nsresult CompileFunction(JSObject* aTarget,
const nsACString& aName,
PRUint32 aArgCount,
const char** aArgArray,
const nsAString& aBody,
const char* aURL,
PRUint32 aLineNo,
PRUint32 aVersion,
bool aShared,
JSObject** aFunctionObject);
virtual nsIScriptGlobalObject *GetGlobalObject();
virtual JSContext* GetNativeContext();
virtual JSObject* GetNativeGlobal();
virtual nsresult CreateNativeGlobalForInner(
nsIScriptGlobalObject *aGlobal,
bool aIsChrome,
nsIPrincipal *aPrincipal,
JSObject** aNativeGlobal,
nsISupports **aHolder);
virtual nsresult ConnectToInner(nsIScriptGlobalObject *aNewInner,
JSObject *aOuterGlobal);
virtual nsresult InitContext();
virtual nsresult CreateOuterObject(nsIScriptGlobalObject *aGlobalObject,
nsIScriptGlobalObject *aCurrentInner);
virtual nsresult SetOuterObject(JSObject* aOuterObject);
virtual nsresult InitOuterWindow();
virtual bool IsContextInitialized();
virtual void FinalizeContext();
virtual void ScriptEvaluated(bool aTerminated);
virtual nsresult SetTerminationFunction(nsScriptTerminationFunc aFunc,
nsISupports* aRef);
virtual bool GetScriptsEnabled();
virtual void SetScriptsEnabled(bool aEnabled, bool aFireTimeouts);
virtual nsresult SetProperty(void *aTarget, const char *aPropName, nsISupports *aVal);
virtual bool GetProcessingScriptTag();
virtual void SetProcessingScriptTag(bool aResult);
virtual bool GetExecutingScript();
virtual void SetGCOnDestruction(bool aGCOnDestruction);
virtual nsresult InitClasses(JSObject* aGlobalObj);
virtual void ClearScope(void* aGlobalObj, bool bClearPolluters);
virtual void WillInitializeContext();
virtual void DidInitializeContext();
virtual nsresult Serialize(nsIObjectOutputStream* aStream, JSScript* aScriptObject);
virtual nsresult Deserialize(nsIObjectInputStream* aStream,
nsScriptObjectHolder<JSScript>& aResult);
virtual nsresult DropScriptObject(void *object);
virtual nsresult HoldScriptObject(void *object);
virtual void EnterModalState();
virtual void LeaveModalState();
NS_DECL_NSIXPCSCRIPTNOTIFY
static void LoadStart();
static void LoadEnd();
static void GarbageCollectNow(bool shrinkingGC = false);
static void ShrinkGCBuffersNow();
static void CycleCollectNow(nsICycleCollectorListener *aListener = nsnull);
static void PokeGC();
static void KillGCTimer();
static void PokeShrinkGCBuffers();
static void KillShrinkGCBuffersTimer();
static void PokeCC();
static void MaybePokeCC();
static void KillCCTimer();
virtual void GC();
protected:
nsresult InitializeExternalClasses();
// Helper to convert xpcom datatypes to jsvals.
nsresult ConvertSupportsTojsvals(nsISupports *aArgs,
JSObject *aScope,
PRUint32 *aArgc,
jsval **aArgv,
mozilla::Maybe<nsRootedJSValueArray> &aPoolRelease);
nsresult AddSupportsPrimitiveTojsvals(nsISupports *aArg, jsval *aArgv);
// given an nsISupports object (presumably an event target or some other
// DOM object), get (or create) the JSObject wrapping it.
nsresult JSObjectFromInterface(nsISupports *aSup, JSObject *aScript,
JSObject **aRet);
// Report the pending exception on our mContext, if any. This
// function will set aside the frame chain on mContext before
// reporting.
void ReportPendingException();
private:
void DestroyJSContext();
nsrefcnt GetCCRefcnt();
JSContext *mContext;
PRUint32 mNumEvaluations;
protected:
struct TerminationFuncHolder;
friend struct TerminationFuncHolder;
struct TerminationFuncClosure
{
TerminationFuncClosure(nsScriptTerminationFunc aFunc,
nsISupports* aArg,
TerminationFuncClosure* aNext) :
mTerminationFunc(aFunc),
mTerminationFuncArg(aArg),
mNext(aNext)
{
}
~TerminationFuncClosure()
{
delete mNext;
}
nsScriptTerminationFunc mTerminationFunc;
nsCOMPtr<nsISupports> mTerminationFuncArg;
TerminationFuncClosure* mNext;
};
struct TerminationFuncHolder
{
TerminationFuncHolder(nsJSContext* aContext)
: mContext(aContext),
mTerminations(aContext->mTerminations)
{
aContext->mTerminations = nsnull;
}
~TerminationFuncHolder()
{
// Have to be careful here. mContext might have picked up new
// termination funcs while the script was evaluating. Prepend whatever
// we have to the current termination funcs on the context (since our
// termination funcs were posted first).
if (mTerminations) {
TerminationFuncClosure* cur = mTerminations;
while (cur->mNext) {
cur = cur->mNext;
}
cur->mNext = mContext->mTerminations;
mContext->mTerminations = mTerminations;
}
}
nsJSContext* mContext;
TerminationFuncClosure* mTerminations;
};
TerminationFuncClosure* mTerminations;
private:
bool mIsInitialized;
bool mScriptsEnabled;
bool mGCOnDestruction;
bool mProcessingScriptTag;
PRUint32 mExecuteDepth;
PRUint32 mDefaultJSOptions;
PRTime mOperationCallbackTime;
PRTime mModalStateTime;
PRUint32 mModalStateDepth;
// mGlobalObjectRef ensures that the outer window stays alive as long as the
// context does. It is eventually collected by the cycle collector.
nsCOMPtr<nsIScriptGlobalObject> mGlobalObjectRef;
static int JSOptionChangedCallback(const char *pref, void *data);
static JSBool DOMOperationCallback(JSContext *cx);
};
class nsIJSRuntimeService;
class nsJSRuntime : public nsIScriptRuntime
{
public:
// let people who can see us use our runtime for convenience.
static JSRuntime *sRuntime;
public:
// nsISupports
NS_DECL_ISUPPORTS
virtual PRUint32 GetScriptTypeID() {
return nsIProgrammingLanguage::JAVASCRIPT;
}
virtual already_AddRefed<nsIScriptContext> CreateContext();
virtual nsresult ParseVersion(const nsString &aVersionStr, PRUint32 *flags);
virtual nsresult DropScriptObject(void *object);
virtual nsresult HoldScriptObject(void *object);
static void Startup();
static void Shutdown();
// Setup all the statics etc - safe to call multiple times after Startup()
static nsresult Init();
// Get the NameSpaceManager, creating if necessary
static nsScriptNameSpaceManager* GetNameSpaceManager();
};
// An interface for fast and native conversion to/from nsIArray. If an object
// supports this interface, JS can reach directly in for the argv, and avoid
// nsISupports conversion. If this interface is not supported, the object will
// be queried for nsIArray, and everything converted via xpcom objects.
#define NS_IJSARGARRAY_IID \
{ /*{E96FB2AE-CB4F-44a0-81F8-D91C80AFE9A3} */ \
0xe96fb2ae, 0xcb4f, 0x44a0, \
{ 0x81, 0xf8, 0xd9, 0x1c, 0x80, 0xaf, 0xe9, 0xa3 } }
class nsIJSArgArray: public nsISupports
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_IJSARGARRAY_IID)
// Bug 312003 describes why this must be "void **", but after calling argv
// may be cast to jsval* and the args found at:
// ((jsval*)argv)[0], ..., ((jsval*)argv)[argc - 1]
virtual nsresult GetArgs(PRUint32 *argc, void **argv) = 0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIJSArgArray, NS_IJSARGARRAY_IID)
/* factory functions */
nsresult NS_CreateJSRuntime(nsIScriptRuntime **aRuntime);
/* prototypes */
void NS_ScriptErrorReporter(JSContext *cx, const char *message, JSErrorReport *report);
JSObject* NS_DOMReadStructuredClone(JSContext* cx,
JSStructuredCloneReader* reader, uint32_t tag,
uint32_t data, void* closure);
JSBool NS_DOMWriteStructuredClone(JSContext* cx,
JSStructuredCloneWriter* writer,
JSObject* obj, void *closure);
void NS_DOMStructuredCloneError(JSContext* cx, uint32_t errorid);
#endif /* nsJSEnvironment_h */
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