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      1 /*
      2  * Copyright (C) 2007 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include "config.h"
     30 #include "GCController.h"
     31 
     32 #include <JavaScriptCore/JSObjectRef.h>
     33 #include <JavaScriptCore/JSRetainPtr.h>
     34 
     35 GCController::GCController()
     36 {
     37 }
     38 
     39 GCController::~GCController()
     40 {
     41 }
     42 
     43 // Static Functions
     44 
     45 static JSValueRef collectCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
     46 {
     47     GCController* controller = static_cast<GCController*>(JSObjectGetPrivate(thisObject));
     48     controller->collect();
     49     return JSValueMakeUndefined(context);
     50 }
     51 
     52 static JSValueRef collectOnAlternateThreadCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
     53 {
     54     bool waitUntilDone = false;
     55     if (argumentCount > 0)
     56         waitUntilDone = JSValueToBoolean(context, arguments[0]);
     57 
     58     GCController* controller = static_cast<GCController*>(JSObjectGetPrivate(thisObject));
     59     controller->collectOnAlternateThread(waitUntilDone);
     60 
     61     return JSValueMakeUndefined(context);
     62 }
     63 
     64 static JSValueRef getJSObjectCountCallback(JSContextRef context, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
     65 {
     66     GCController* controller = static_cast<GCController*>(JSObjectGetPrivate(thisObject));
     67     size_t jsObjectCount = controller->getJSObjectCount();
     68 
     69     return JSValueMakeNumber(context, jsObjectCount);
     70 }
     71 
     72 // Object Creation
     73 
     74 void GCController::makeWindowObject(JSContextRef context, JSObjectRef windowObject, JSValueRef* exception)
     75 {
     76     JSRetainPtr<JSStringRef> gcControllerStr(Adopt, JSStringCreateWithUTF8CString("GCController"));
     77 
     78     JSClassRef classRef = getJSClass();
     79     JSValueRef gcControllerObject = JSObjectMake(context, classRef, this);
     80     JSClassRelease(classRef);
     81 
     82     JSObjectSetProperty(context, windowObject, gcControllerStr.get(), gcControllerObject, kJSPropertyAttributeReadOnly | kJSPropertyAttributeDontDelete, exception);
     83 }
     84 
     85 JSClassRef GCController::getJSClass()
     86 {
     87     static JSStaticFunction staticFunctions[] = {
     88         { "collect", collectCallback, kJSPropertyAttributeReadOnly | kJSPropertyAttributeDontDelete },
     89         { "collectOnAlternateThread", collectOnAlternateThreadCallback, kJSPropertyAttributeReadOnly | kJSPropertyAttributeDontDelete },
     90         { "getJSObjectCount", getJSObjectCountCallback, kJSPropertyAttributeReadOnly | kJSPropertyAttributeDontDelete },
     91         { 0, 0, 0 }
     92     };
     93 
     94     static JSClassDefinition classDefinition = {
     95         0, kJSClassAttributeNone, "GCController", 0, 0, staticFunctions,
     96         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
     97     };
     98 
     99     return JSClassCreate(&classDefinition);
    100 }
    101