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1 /* |
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2 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved. |
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3 * |
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4 * Redistribution and use in source and binary forms, with or without |
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5 * modification, are permitted provided that the following conditions |
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6 * are met: |
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7 * 1. Redistributions of source code must retain the above copyright |
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8 * notice, this list of conditions and the following disclaimer. |
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9 * 2. Redistributions in binary form must reproduce the above copyright |
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10 * notice, this list of conditions and the following disclaimer in the |
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11 * documentation and/or other materials provided with the distribution. |
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12 * |
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13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
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14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
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17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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24 */ |
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25 |
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26 #include "config.h" |
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27 #include "JSContextRef.h" |
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28 #include "JSContextRefPrivate.h" |
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29 |
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30 #include "APICast.h" |
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31 #include "InitializeThreading.h" |
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32 #include "JSCallbackObject.h" |
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33 #include "JSClassRef.h" |
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34 #include "JSGlobalObject.h" |
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35 #include "JSObject.h" |
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36 #include <wtf/text/StringHash.h> |
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37 |
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38 #if OS(DARWIN) |
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39 #include <mach-o/dyld.h> |
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40 |
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41 static const int32_t webkitFirstVersionWithConcurrentGlobalContexts = 0x2100500; // 528.5.0 |
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42 #endif |
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43 |
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44 using namespace JSC; |
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45 |
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46 JSContextGroupRef JSContextGroupCreate() |
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47 { |
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48 initializeThreading(); |
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49 return toRef(JSGlobalData::createContextGroup(ThreadStackTypeSmall).releaseRef()); |
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50 } |
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51 |
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52 JSContextGroupRef JSContextGroupRetain(JSContextGroupRef group) |
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53 { |
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54 toJS(group)->ref(); |
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55 return group; |
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56 } |
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57 |
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58 void JSContextGroupRelease(JSContextGroupRef group) |
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59 { |
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60 toJS(group)->deref(); |
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61 } |
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62 |
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63 JSGlobalContextRef JSGlobalContextCreate(JSClassRef globalObjectClass) |
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64 { |
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65 initializeThreading(); |
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66 #if OS(DARWIN) |
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67 // When running on Tiger or Leopard, or if the application was linked before JSGlobalContextCreate was changed |
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68 // to use a unique JSGlobalData, we use a shared one for compatibility. |
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69 #if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD) |
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70 if (NSVersionOfLinkTimeLibrary("JavaScriptCore") <= webkitFirstVersionWithConcurrentGlobalContexts) { |
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71 #else |
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72 { |
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73 #endif |
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74 JSLock lock(LockForReal); |
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75 return JSGlobalContextCreateInGroup(toRef(&JSGlobalData::sharedInstance()), globalObjectClass); |
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76 } |
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77 #endif // OS(DARWIN) |
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78 |
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79 return JSGlobalContextCreateInGroup(0, globalObjectClass); |
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80 } |
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81 |
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82 JSGlobalContextRef JSGlobalContextCreateInGroup(JSContextGroupRef group, JSClassRef globalObjectClass) |
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83 { |
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84 initializeThreading(); |
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85 |
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86 JSLock lock(LockForReal); |
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87 RefPtr<JSGlobalData> globalData = group ? PassRefPtr<JSGlobalData>(toJS(group)) : JSGlobalData::createContextGroup(ThreadStackTypeSmall); |
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88 |
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89 APIEntryShim entryShim(globalData.get(), false); |
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90 |
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91 #if ENABLE(JSC_MULTIPLE_THREADS) |
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92 globalData->makeUsableFromMultipleThreads(); |
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93 #endif |
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94 |
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95 if (!globalObjectClass) { |
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96 JSGlobalObject* globalObject = new (globalData.get()) JSGlobalObject; |
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97 return JSGlobalContextRetain(toGlobalRef(globalObject->globalExec())); |
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98 } |
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99 |
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100 JSGlobalObject* globalObject = new (globalData.get()) JSCallbackObject<JSGlobalObject>(globalObjectClass, JSCallbackObject<JSGlobalObject>::createStructure(jsNull())); |
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101 ExecState* exec = globalObject->globalExec(); |
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102 JSValue prototype = globalObjectClass->prototype(exec); |
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103 if (!prototype) |
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104 prototype = jsNull(); |
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105 globalObject->resetPrototype(prototype); |
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106 return JSGlobalContextRetain(toGlobalRef(exec)); |
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107 } |
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108 |
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109 JSGlobalContextRef JSGlobalContextRetain(JSGlobalContextRef ctx) |
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110 { |
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111 ExecState* exec = toJS(ctx); |
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112 APIEntryShim entryShim(exec); |
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113 |
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114 JSGlobalData& globalData = exec->globalData(); |
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115 gcProtect(exec->dynamicGlobalObject()); |
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116 globalData.ref(); |
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117 return ctx; |
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118 } |
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119 |
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120 void JSGlobalContextRelease(JSGlobalContextRef ctx) |
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121 { |
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122 ExecState* exec = toJS(ctx); |
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123 JSLock lock(exec); |
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124 |
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125 JSGlobalData& globalData = exec->globalData(); |
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126 JSGlobalObject* dgo = exec->dynamicGlobalObject(); |
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127 IdentifierTable* savedIdentifierTable = wtfThreadData().setCurrentIdentifierTable(globalData.identifierTable); |
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128 |
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129 // One reference is held by JSGlobalObject, another added by JSGlobalContextRetain(). |
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130 bool releasingContextGroup = globalData.refCount() == 2; |
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131 bool releasingGlobalObject = Heap::heap(dgo)->unprotect(dgo); |
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132 // If this is the last reference to a global data, it should also |
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133 // be the only remaining reference to the global object too! |
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134 ASSERT(!releasingContextGroup || releasingGlobalObject); |
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135 |
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136 // An API 'JSGlobalContextRef' retains two things - a global object and a |
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137 // global data (or context group, in API terminology). |
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138 // * If this is the last reference to any contexts in the given context group, |
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139 // call destroy on the heap (the global data is being freed). |
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140 // * If this was the last reference to the global object, then unprotecting |
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141 // it may release a lot of GC memory - run the garbage collector now. |
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142 // * If there are more references remaining the the global object, then do nothing |
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143 // (specifically that is more protects, which we assume come from other JSGlobalContextRefs). |
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144 if (releasingContextGroup) |
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145 globalData.heap.destroy(); |
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146 else if (releasingGlobalObject) |
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147 globalData.heap.collectAllGarbage(); |
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148 |
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149 globalData.deref(); |
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150 |
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151 wtfThreadData().setCurrentIdentifierTable(savedIdentifierTable); |
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152 } |
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153 |
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154 JSObjectRef JSContextGetGlobalObject(JSContextRef ctx) |
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155 { |
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156 ExecState* exec = toJS(ctx); |
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157 APIEntryShim entryShim(exec); |
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158 |
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159 // It is necessary to call toThisObject to get the wrapper object when used with WebCore. |
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160 return toRef(exec->lexicalGlobalObject()->toThisObject(exec)); |
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161 } |
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162 |
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163 JSContextGroupRef JSContextGetGroup(JSContextRef ctx) |
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164 { |
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165 ExecState* exec = toJS(ctx); |
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166 return toRef(&exec->globalData()); |
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167 } |
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168 |
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169 JSGlobalContextRef JSContextGetGlobalContext(JSContextRef ctx) |
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170 { |
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171 ExecState* exec = toJS(ctx); |
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172 APIEntryShim entryShim(exec); |
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173 |
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174 return toGlobalRef(exec->lexicalGlobalObject()->globalExec()); |
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175 } |