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gecko-dev
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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 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsJSEnvironment_h
#define nsJSEnvironment_h
#include "nsIScriptContext.h"
#include "nsIScriptRuntime.h"
#include "nsIScriptGlobalObject.h"
#include "nsCOMPtr.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "nsIObserver.h"
#include "nsIXPCScriptNotify.h"
#include "prtime.h"
#include "nsCycleCollectionParticipant.h"
#include "nsIXPConnect.h"
#include "nsIArray.h"
#include "mozilla/Attributes.h"
class nsIXPConnectJSObjectHolder;
class nsRootedJSValueArray;
class nsScriptNameSpaceManager;
namespace mozilla {
template <class> class Maybe;
}
// The amount of time we wait between a request to GC (due to leaving
// a page) and doing the actual GC.
#define NS_GC_DELAY 4000 // ms
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 void SetGlobalObject(nsIScriptGlobalObject* aGlobalObject)
{
mGlobalObjectRef = aGlobalObject;
}
virtual nsresult EvaluateString(const nsAString& aScript,
JSObject* aScopeObject,
nsIPrincipal *principal,
nsIPrincipal *originPrincipal,
const char *aURL,
PRUint32 aLineNo,
JSVersion 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();
inline nsIScriptGlobalObject *GetGlobalObjectRef() { return mGlobalObjectRef; };
virtual JSContext* GetNativeContext();
virtual JSObject* GetNativeGlobal();
virtual nsresult InitContext();
virtual bool IsContextInitialized();
virtual void ScriptEvaluated(bool aTerminated);
virtual void SetTerminationFunction(nsScriptTerminationFunc aFunc,
nsIDOMWindow* aRef);
virtual bool GetScriptsEnabled();
virtual void SetScriptsEnabled(bool aEnabled, bool aFireTimeouts);
virtual nsresult SetProperty(JSObject* 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 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(js::gcreason::Reason reason,
PRUint32 aGckind,
bool aGlobal);
static void ShrinkGCBuffersNow();
// If aExtraForgetSkippableCalls is -1, forgetSkippable won't be
// called even if the previous collection was GC.
static void CycleCollectNow(nsICycleCollectorListener *aListener = nsnull,
PRInt32 aExtraForgetSkippableCalls = 0,
bool aForced = true);
static void PokeGC(js::gcreason::Reason aReason, int aDelay = 0);
static void KillGCTimer();
static void PokeShrinkGCBuffers();
static void KillShrinkGCBuffersTimer();
static void MaybePokeCC();
static void KillCCTimer();
static void KillFullGCTimer();
static void KillInterSliceGCTimer();
virtual void GC(js::gcreason::Reason aReason);
static PRUint32 CleanupsSinceLastGC();
nsIScriptGlobalObject* GetCachedGlobalObject()
{
// Verify that we have a global so that this
// does always return a null when GetGlobalObject() is null.
JSObject* global = JS_GetGlobalObject(mContext);
return global ? mGlobalObjectRef.get() : nsnull;
}
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;
bool mActive;
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;
nsJSContext *mNext;
nsJSContext **mPrev;
// 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 MOZ_FINAL : public nsIScriptRuntime
{
public:
// let people who can see us use our runtime for convenience.
static JSRuntime *sRuntime;
public:
// nsISupports
NS_DECL_ISUPPORTS
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 \
{ 0xb6acdac8, 0xf5c6, 0x432c, \
{ 0xa8, 0x6e, 0x33, 0xee, 0xb1, 0xb0, 0xcd, 0xdc } }
class nsIJSArgArray : public nsIArray
{
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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