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      1 /*
      2  * Copyright (C) 2009 Google 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 INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "bindings/v8/V8PerIsolateData.h"
     28 
     29 #include "bindings/v8/DOMDataStore.h"
     30 #include "bindings/v8/PageScriptDebugServer.h"
     31 #include "bindings/v8/ScriptGCEvent.h"
     32 #include "bindings/v8/ScriptProfiler.h"
     33 #include "bindings/v8/V8Binding.h"
     34 #include "bindings/v8/V8HiddenValue.h"
     35 #include "bindings/v8/V8ObjectConstructor.h"
     36 #include "bindings/v8/V8RecursionScope.h"
     37 #include "bindings/v8/V8ScriptRunner.h"
     38 #include "public/platform/Platform.h"
     39 #include "wtf/MainThread.h"
     40 
     41 namespace WebCore {
     42 
     43 static V8PerIsolateData* mainThreadPerIsolateData = 0;
     44 
     45 #ifndef NDEBUG
     46 static void assertV8RecursionScope()
     47 {
     48     ASSERT(V8RecursionScope::properlyUsed(v8::Isolate::GetCurrent()));
     49 }
     50 #endif
     51 
     52 V8PerIsolateData::V8PerIsolateData(v8::Isolate* isolate)
     53     : m_isolate(isolate)
     54     , m_isolateHolder(adoptPtr(new gin::IsolateHolder(m_isolate, v8ArrayBufferAllocator())))
     55     , m_stringCache(adoptPtr(new StringCache(m_isolate)))
     56     , m_hiddenValue(adoptPtr(new V8HiddenValue()))
     57     , m_constructorMode(ConstructorMode::CreateNewObject)
     58     , m_recursionLevel(0)
     59 #ifndef NDEBUG
     60     , m_internalScriptRecursionLevel(0)
     61 #endif
     62     , m_gcEventData(adoptPtr(new GCEventData()))
     63     , m_performingMicrotaskCheckpoint(false)
     64 {
     65 #ifndef NDEBUG
     66     // currentThread will always be non-null in production, but can be null in Chromium unit tests.
     67     if (blink::Platform::current()->currentThread())
     68         isolate->AddCallCompletedCallback(&assertV8RecursionScope);
     69 #endif
     70     if (isMainThread()) {
     71         mainThreadPerIsolateData = this;
     72         PageScriptDebugServer::setMainThreadIsolate(isolate);
     73     }
     74 }
     75 
     76 V8PerIsolateData::~V8PerIsolateData()
     77 {
     78     if (m_scriptRegexpScriptState)
     79         m_scriptRegexpScriptState->disposePerContextData();
     80     if (isMainThread())
     81         mainThreadPerIsolateData = 0;
     82 }
     83 
     84 v8::Isolate* V8PerIsolateData::mainThreadIsolate()
     85 {
     86     ASSERT(isMainThread());
     87     ASSERT(mainThreadPerIsolateData);
     88     return mainThreadPerIsolateData->isolate();
     89 }
     90 
     91 void V8PerIsolateData::ensureInitialized(v8::Isolate* isolate)
     92 {
     93     ASSERT(isolate);
     94     if (!isolate->GetData(gin::kEmbedderBlink)) {
     95         V8PerIsolateData* data = new V8PerIsolateData(isolate);
     96         isolate->SetData(gin::kEmbedderBlink, data);
     97     }
     98 }
     99 
    100 v8::Persistent<v8::Value>& V8PerIsolateData::ensureLiveRoot()
    101 {
    102     if (m_liveRoot.isEmpty())
    103         m_liveRoot.set(m_isolate, v8::Null(m_isolate));
    104     return m_liveRoot.getUnsafe();
    105 }
    106 
    107 void V8PerIsolateData::dispose(v8::Isolate* isolate)
    108 {
    109 #ifndef NDEBUG
    110     if (blink::Platform::current()->currentThread())
    111         isolate->RemoveCallCompletedCallback(&assertV8RecursionScope);
    112 #endif
    113     void* data = isolate->GetData(gin::kEmbedderBlink);
    114     delete static_cast<V8PerIsolateData*>(data);
    115     isolate->SetData(gin::kEmbedderBlink, 0);
    116 }
    117 
    118 V8PerIsolateData::DOMTemplateMap& V8PerIsolateData::currentDOMTemplateMap()
    119 {
    120     if (DOMWrapperWorld::current(m_isolate).isMainWorld())
    121         return m_domTemplateMapForMainWorld;
    122     return m_domTemplateMapForNonMainWorld;
    123 }
    124 
    125 v8::Handle<v8::FunctionTemplate> V8PerIsolateData::domTemplate(void* domTemplateKey, v8::FunctionCallback callback, v8::Handle<v8::Value> data, v8::Handle<v8::Signature> signature, int length)
    126 {
    127     DOMTemplateMap& domTemplateMap = currentDOMTemplateMap();
    128     DOMTemplateMap::iterator result = domTemplateMap.find(domTemplateKey);
    129     if (result != domTemplateMap.end())
    130         return result->value.Get(m_isolate);
    131 
    132     v8::Local<v8::FunctionTemplate> templ = v8::FunctionTemplate::New(m_isolate, callback, data, signature, length);
    133     domTemplateMap.add(domTemplateKey, v8::Eternal<v8::FunctionTemplate>(m_isolate, templ));
    134     return templ;
    135 }
    136 
    137 v8::Handle<v8::FunctionTemplate> V8PerIsolateData::existingDOMTemplate(void* domTemplateKey)
    138 {
    139     DOMTemplateMap& domTemplateMap = currentDOMTemplateMap();
    140     DOMTemplateMap::iterator result = domTemplateMap.find(domTemplateKey);
    141     if (result != domTemplateMap.end())
    142         return result->value.Get(m_isolate);
    143     return v8::Local<v8::FunctionTemplate>();
    144 }
    145 
    146 void V8PerIsolateData::setDOMTemplate(void* domTemplateKey, v8::Handle<v8::FunctionTemplate> templ)
    147 {
    148     currentDOMTemplateMap().add(domTemplateKey, v8::Eternal<v8::FunctionTemplate>(m_isolate, v8::Local<v8::FunctionTemplate>(templ)));
    149 }
    150 
    151 v8::Local<v8::Context> V8PerIsolateData::ensureScriptRegexpContext()
    152 {
    153     if (!m_scriptRegexpScriptState) {
    154         v8::Local<v8::Context> context(v8::Context::New(m_isolate));
    155         m_scriptRegexpScriptState = ScriptState::create(context, DOMWrapperWorld::create());
    156     }
    157     return m_scriptRegexpScriptState->context();
    158 }
    159 
    160 bool V8PerIsolateData::hasInstance(const WrapperTypeInfo* info, v8::Handle<v8::Value> value)
    161 {
    162     return hasInstance(info, value, m_domTemplateMapForMainWorld)
    163         || hasInstance(info, value, m_domTemplateMapForNonMainWorld);
    164 }
    165 
    166 bool V8PerIsolateData::hasInstance(const WrapperTypeInfo* info, v8::Handle<v8::Value> value, DOMTemplateMap& domTemplateMap)
    167 {
    168     DOMTemplateMap::iterator result = domTemplateMap.find(info);
    169     if (result == domTemplateMap.end())
    170         return false;
    171     v8::Handle<v8::FunctionTemplate> templ = result->value.Get(m_isolate);
    172     return templ->HasInstance(value);
    173 }
    174 
    175 v8::Handle<v8::Object> V8PerIsolateData::findInstanceInPrototypeChain(const WrapperTypeInfo* info, v8::Handle<v8::Value> value)
    176 {
    177     v8::Handle<v8::Object> wrapper = findInstanceInPrototypeChain(info, value, m_domTemplateMapForMainWorld);
    178     if (!wrapper.IsEmpty())
    179         return wrapper;
    180     return findInstanceInPrototypeChain(info, value, m_domTemplateMapForNonMainWorld);
    181 }
    182 
    183 v8::Handle<v8::Object> V8PerIsolateData::findInstanceInPrototypeChain(const WrapperTypeInfo* info, v8::Handle<v8::Value> value, DOMTemplateMap& domTemplateMap)
    184 {
    185     if (value.IsEmpty() || !value->IsObject())
    186         return v8::Handle<v8::Object>();
    187     DOMTemplateMap::iterator result = domTemplateMap.find(info);
    188     if (result == domTemplateMap.end())
    189         return v8::Handle<v8::Object>();
    190     v8::Handle<v8::FunctionTemplate> templ = result->value.Get(m_isolate);
    191     return v8::Handle<v8::Object>::Cast(value)->FindInstanceInPrototypeChain(templ);
    192 }
    193 
    194 static void constructorOfToString(const v8::FunctionCallbackInfo<v8::Value>& info)
    195 {
    196     // The DOM constructors' toString functions grab the current toString
    197     // for Functions by taking the toString function of itself and then
    198     // calling it with the constructor as its receiver. This means that
    199     // changes to the Function prototype chain or toString function are
    200     // reflected when printing DOM constructors. The only wart is that
    201     // changes to a DOM constructor's toString's toString will cause the
    202     // toString of the DOM constructor itself to change. This is extremely
    203     // obscure and unlikely to be a problem.
    204     v8::Handle<v8::Value> value = info.Callee()->Get(v8AtomicString(info.GetIsolate(), "toString"));
    205     if (!value->IsFunction()) {
    206         v8SetReturnValue(info, v8::String::Empty(info.GetIsolate()));
    207         return;
    208     }
    209     v8SetReturnValue(info, V8ScriptRunner::callInternalFunction(v8::Handle<v8::Function>::Cast(value), info.This(), 0, 0, info.GetIsolate()));
    210 }
    211 
    212 v8::Handle<v8::FunctionTemplate> V8PerIsolateData::toStringTemplate()
    213 {
    214     if (m_toStringTemplate.isEmpty())
    215         m_toStringTemplate.set(m_isolate, v8::FunctionTemplate::New(m_isolate, constructorOfToString));
    216     return m_toStringTemplate.newLocal(m_isolate);
    217 }
    218 
    219 } // namespace WebCore
    220