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      1 /*
      2  * Copyright (C) 2006, 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  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "JSContextRef.h"
     28 #include "JSContextRefPrivate.h"
     29 
     30 #include "APICast.h"
     31 #include "InitializeThreading.h"
     32 #include "JSCallbackObject.h"
     33 #include "JSClassRef.h"
     34 #include "JSGlobalObject.h"
     35 #include "JSObject.h"
     36 #include <wtf/Platform.h>
     37 
     38 #if OS(DARWIN)
     39 #include <mach-o/dyld.h>
     40 
     41 static const int32_t webkitFirstVersionWithConcurrentGlobalContexts = 0x2100500; // 528.5.0
     42 #endif
     43 
     44 using namespace JSC;
     45 
     46 JSContextGroupRef JSContextGroupCreate()
     47 {
     48     initializeThreading();
     49     return toRef(JSGlobalData::createNonDefault().releaseRef());
     50 }
     51 
     52 JSContextGroupRef JSContextGroupRetain(JSContextGroupRef group)
     53 {
     54     toJS(group)->ref();
     55     return group;
     56 }
     57 
     58 void JSContextGroupRelease(JSContextGroupRef group)
     59 {
     60     toJS(group)->deref();
     61 }
     62 
     63 JSGlobalContextRef JSGlobalContextCreate(JSClassRef globalObjectClass)
     64 {
     65     initializeThreading();
     66 #if OS(DARWIN)
     67     // When running on Tiger or Leopard, or if the application was linked before JSGlobalContextCreate was changed
     68     // to use a unique JSGlobalData, we use a shared one for compatibility.
     69 #if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD)
     70     if (NSVersionOfLinkTimeLibrary("JavaScriptCore") <= webkitFirstVersionWithConcurrentGlobalContexts) {
     71 #else
     72     {
     73 #endif
     74         JSLock lock(LockForReal);
     75         return JSGlobalContextCreateInGroup(toRef(&JSGlobalData::sharedInstance()), globalObjectClass);
     76     }
     77 #endif // OS(DARWIN)
     78 
     79     return JSGlobalContextCreateInGroup(0, globalObjectClass);
     80 }
     81 
     82 JSGlobalContextRef JSGlobalContextCreateInGroup(JSContextGroupRef group, JSClassRef globalObjectClass)
     83 {
     84     initializeThreading();
     85 
     86     JSLock lock(LockForReal);
     87     RefPtr<JSGlobalData> globalData = group ? PassRefPtr<JSGlobalData>(toJS(group)) : JSGlobalData::createNonDefault();
     88 
     89     APIEntryShim entryShim(globalData.get(), false);
     90 
     91 #if ENABLE(JSC_MULTIPLE_THREADS)
     92     globalData->makeUsableFromMultipleThreads();
     93 #endif
     94 
     95     if (!globalObjectClass) {
     96         JSGlobalObject* globalObject = new (globalData.get()) JSGlobalObject;
     97         return JSGlobalContextRetain(toGlobalRef(globalObject->globalExec()));
     98     }
     99 
    100     JSGlobalObject* globalObject = new (globalData.get()) JSCallbackObject<JSGlobalObject>(globalObjectClass);
    101     ExecState* exec = globalObject->globalExec();
    102     JSValue prototype = globalObjectClass->prototype(exec);
    103     if (!prototype)
    104         prototype = jsNull();
    105     globalObject->resetPrototype(prototype);
    106     return JSGlobalContextRetain(toGlobalRef(exec));
    107 }
    108 
    109 JSGlobalContextRef JSGlobalContextRetain(JSGlobalContextRef ctx)
    110 {
    111     ExecState* exec = toJS(ctx);
    112     APIEntryShim entryShim(exec);
    113 
    114     JSGlobalData& globalData = exec->globalData();
    115     gcProtect(exec->dynamicGlobalObject());
    116     globalData.ref();
    117     return ctx;
    118 }
    119 
    120 void JSGlobalContextRelease(JSGlobalContextRef ctx)
    121 {
    122     ExecState* exec = toJS(ctx);
    123     APIEntryShim entryShim(exec, false);
    124 
    125     gcUnprotect(exec->dynamicGlobalObject());
    126 
    127     JSGlobalData& globalData = exec->globalData();
    128     if (globalData.refCount() == 2) { // One reference is held by JSGlobalObject, another added by JSGlobalContextRetain().
    129         // The last reference was released, this is our last chance to collect.
    130         globalData.heap.destroy();
    131     } else
    132         globalData.heap.collectAllGarbage();
    133 
    134     globalData.deref();
    135 }
    136 
    137 JSObjectRef JSContextGetGlobalObject(JSContextRef ctx)
    138 {
    139     ExecState* exec = toJS(ctx);
    140     APIEntryShim entryShim(exec);
    141 
    142     // It is necessary to call toThisObject to get the wrapper object when used with WebCore.
    143     return toRef(exec->lexicalGlobalObject()->toThisObject(exec));
    144 }
    145 
    146 JSContextGroupRef JSContextGetGroup(JSContextRef ctx)
    147 {
    148     ExecState* exec = toJS(ctx);
    149     return toRef(&exec->globalData());
    150 }
    151 
    152 JSGlobalContextRef JSContextGetGlobalContext(JSContextRef ctx)
    153 {
    154     ExecState* exec = toJS(ctx);
    155     APIEntryShim entryShim(exec);
    156 
    157     return toGlobalRef(exec->lexicalGlobalObject()->globalExec());
    158 }
    159