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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 nsICycleCollectorListener;
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, bool aGCOnDestruction,
nsIScriptGlobalObject* aGlobalObject);
virtual ~nsJSContext();
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(nsJSContext,
nsIScriptContext)
virtual nsresult EvaluateString(const nsAString& aScript,
JS::Handle<JSObject*> aScopeObject,
JS::CompileOptions &aOptions,
bool aCoerceToString,
JS::Value* aRetValue) MOZ_OVERRIDE;
virtual nsresult BindCompiledEventHandler(nsISupports *aTarget,
JS::Handle<JSObject*> aScope,
JS::Handle<JSObject*> aHandler,
JS::MutableHandle<JSObject*> aBoundHandler) MOZ_OVERRIDE;
virtual nsIScriptGlobalObject *GetGlobalObject() MOZ_OVERRIDE;
inline nsIScriptGlobalObject *GetGlobalObjectRef() { return mGlobalObjectRef; }
virtual JSContext* GetNativeContext() MOZ_OVERRIDE;
virtual JSObject* GetNativeGlobal() MOZ_OVERRIDE;
virtual nsresult InitContext() MOZ_OVERRIDE;
virtual bool IsContextInitialized() MOZ_OVERRIDE;
virtual void ScriptEvaluated(bool aTerminated) MOZ_OVERRIDE;
virtual bool GetScriptsEnabled() MOZ_OVERRIDE;
virtual void SetScriptsEnabled(bool aEnabled, bool aFireTimeouts) MOZ_OVERRIDE;
virtual nsresult SetProperty(JS::Handle<JSObject*> aTarget, const char* aPropName, nsISupports* aVal) MOZ_OVERRIDE;
virtual bool GetProcessingScriptTag() MOZ_OVERRIDE;
virtual void SetProcessingScriptTag(bool aResult) MOZ_OVERRIDE;
virtual nsresult InitClasses(JS::Handle<JSObject*> aGlobalObj) MOZ_OVERRIDE;
virtual void WillInitializeContext() MOZ_OVERRIDE;
virtual void DidInitializeContext() MOZ_OVERRIDE;
virtual nsresult Serialize(nsIObjectOutputStream* aStream,
JS::Handle<JSScript*> aScriptObject) MOZ_OVERRIDE;
virtual nsresult Deserialize(nsIObjectInputStream* aStream,
JS::MutableHandle<JSScript*> aResult) MOZ_OVERRIDE;
NS_DECL_NSIXPCSCRIPTNOTIFY
static void LoadStart();
static void LoadEnd();
enum IsCompartment {
CompartmentGC,
NonCompartmentGC
};
enum IsShrinking {
ShrinkingGC,
NonShrinkingGC
};
enum IsIncremental {
IncrementalGC,
NonIncrementalGC
};
static void GarbageCollectNow(JS::gcreason::Reason reason,
IsIncremental aIncremental = NonIncrementalGC,
IsCompartment aCompartment = NonCompartmentGC,
IsShrinking aShrinking = NonShrinkingGC,
int64_t aSliceMillis = 0);
static void ShrinkGCBuffersNow();
// If aExtraForgetSkippableCalls is -1, forgetSkippable won't be
// called even if the previous collection was GC.
static void CycleCollectNow(nsICycleCollectorListener *aListener = nullptr,
int32_t aExtraForgetSkippableCalls = 0,
bool aManuallyTriggered = 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();
// Calling LikelyShortLivingObjectCreated() makes a GC more likely.
static void LikelyShortLivingObjectCreated();
virtual void GC(JS::gcreason::Reason aReason) MOZ_OVERRIDE;
static uint32_t CleanupsSinceLastGC();
nsIScriptGlobalObject* GetCachedGlobalObject()
{
// Verify that we have a global so that this
// does always return a null when GetGlobalObject() is null.
JSObject* global = GetNativeGlobal();
return global ? mGlobalObjectRef.get() : nullptr;
}
protected:
nsresult InitializeExternalClasses();
// Helper to convert xpcom datatypes to jsvals.
nsresult ConvertSupportsTojsvals(nsISupports *aArgs,
JS::Handle<JSObject*> aScope,
uint32_t *aArgc,
JS::Value **aArgv,
mozilla::Maybe<nsRootedJSValueArray> &aPoolRelease);
nsresult AddSupportsPrimitiveTojsvals(nsISupports *aArg, JS::Value *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,
JS::Handle<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;
bool mIsInitialized;
bool mScriptsEnabled;
bool mGCOnDestruction;
bool mProcessingScriptTag;
uint32_t mDefaultJSOptions;
PRTime mOperationCallbackTime;
PRTime mModalStateTime;
uint32_t 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 bool 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(bool aGCOnDestruction,
nsIScriptGlobalObject* aGlobalObject) MOZ_OVERRIDE;
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 JS::Value* and the args found at:
// ((JS::Value*)argv)[0], ..., ((JS::Value*)argv)[argc - 1]
virtual nsresult GetArgs(uint32_t *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);
bool NS_DOMWriteStructuredClone(JSContext* cx,
JSStructuredCloneWriter* writer,
JS::Handle<JSObject*> obj, void *closure);
void NS_DOMStructuredCloneError(JSContext* cx, uint32_t errorid);
#endif /* nsJSEnvironment_h */