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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/core/v8/V8PerIsolateData.h"
     28 
     29 #include "bindings/core/v8/DOMDataStore.h"
     30 #include "bindings/core/v8/PageScriptDebugServer.h"
     31 #include "bindings/core/v8/ScriptGCEvent.h"
     32 #include "bindings/core/v8/ScriptProfiler.h"
     33 #include "bindings/core/v8/V8Binding.h"
     34 #include "bindings/core/v8/V8HiddenValue.h"
     35 #include "bindings/core/v8/V8ObjectConstructor.h"
     36 #include "bindings/core/v8/V8RecursionScope.h"
     37 #include "bindings/core/v8/V8ScriptRunner.h"
     38 #include "core/frame/UseCounter.h"
     39 #include "public/platform/Platform.h"
     40 #include "wtf/MainThread.h"
     41 
     42 namespace blink {
     43 
     44 static V8PerIsolateData* mainThreadPerIsolateData = 0;
     45 
     46 #if ENABLE(ASSERT)
     47 static void assertV8RecursionScope()
     48 {
     49     ASSERT(V8RecursionScope::properlyUsed(v8::Isolate::GetCurrent()));
     50 }
     51 #endif
     52 
     53 static void useCounterCallback(v8::Isolate* isolate, v8::Isolate::UseCounterFeature feature)
     54 {
     55     switch (feature) {
     56     case v8::Isolate::kUseAsm:
     57         UseCounter::count(currentExecutionContext(isolate), UseCounter::UseAsm);
     58         break;
     59     default:
     60         ASSERT_NOT_REACHED();
     61     }
     62 }
     63 
     64 V8PerIsolateData::V8PerIsolateData()
     65     : m_destructionPending(false)
     66     , m_isolateHolder(adoptPtr(new gin::IsolateHolder()))
     67     , m_stringCache(adoptPtr(new StringCache(isolate())))
     68     , m_hiddenValue(adoptPtr(new V8HiddenValue()))
     69     , m_constructorMode(ConstructorMode::CreateNewObject)
     70     , m_recursionLevel(0)
     71     , m_isHandlingRecursionLevelError(false)
     72 #if ENABLE(ASSERT)
     73     , m_internalScriptRecursionLevel(0)
     74 #endif
     75     , m_gcEventData(adoptPtr(new GCEventData()))
     76     , m_performingMicrotaskCheckpoint(false)
     77 {
     78     // FIXME: Remove once all v8::Isolate::GetCurrent() calls are gone.
     79     isolate()->Enter();
     80 #if ENABLE(ASSERT)
     81     // currentThread will always be non-null in production, but can be null in Chromium unit tests.
     82     if (blink::Platform::current()->currentThread())
     83         isolate()->AddCallCompletedCallback(&assertV8RecursionScope);
     84 #endif
     85     if (isMainThread()) {
     86         mainThreadPerIsolateData = this;
     87         PageScriptDebugServer::setMainThreadIsolate(isolate());
     88     }
     89     isolate()->SetUseCounterCallback(&useCounterCallback);
     90 }
     91 
     92 V8PerIsolateData::~V8PerIsolateData()
     93 {
     94     if (m_scriptRegexpScriptState)
     95         m_scriptRegexpScriptState->disposePerContextData();
     96     if (isMainThread())
     97         mainThreadPerIsolateData = 0;
     98 }
     99 
    100 v8::Isolate* V8PerIsolateData::mainThreadIsolate()
    101 {
    102     ASSERT(isMainThread());
    103     ASSERT(mainThreadPerIsolateData);
    104     return mainThreadPerIsolateData->isolate();
    105 }
    106 
    107 v8::Isolate* V8PerIsolateData::initialize()
    108 {
    109     V8PerIsolateData* data = new V8PerIsolateData();
    110     v8::Isolate* isolate = data->isolate();
    111     isolate->SetData(gin::kEmbedderBlink, data);
    112     return isolate;
    113 }
    114 
    115 v8::Persistent<v8::Value>& V8PerIsolateData::ensureLiveRoot()
    116 {
    117     if (m_liveRoot.isEmpty())
    118         m_liveRoot.set(isolate(), v8::Null(isolate()));
    119     return m_liveRoot.getUnsafe();
    120 }
    121 
    122 void V8PerIsolateData::willBeDestroyed(v8::Isolate* isolate)
    123 {
    124     V8PerIsolateData* data = from(isolate);
    125 
    126     ASSERT(!data->m_destructionPending);
    127     data->m_destructionPending = true;
    128 
    129     // Clear any data that may have handles into the heap,
    130     // prior to calling ThreadState::detach().
    131     data->m_idbPendingTransactionMonitor.clear();
    132 }
    133 
    134 void V8PerIsolateData::destroy(v8::Isolate* isolate)
    135 {
    136 #if ENABLE(ASSERT)
    137     if (blink::Platform::current()->currentThread())
    138         isolate->RemoveCallCompletedCallback(&assertV8RecursionScope);
    139 #endif
    140     V8PerIsolateData* data = from(isolate);
    141     // FIXME: Remove once all v8::Isolate::GetCurrent() calls are gone.
    142     isolate->Exit();
    143     delete data;
    144 }
    145 
    146 V8PerIsolateData::DOMTemplateMap& V8PerIsolateData::currentDOMTemplateMap()
    147 {
    148     if (DOMWrapperWorld::current(isolate()).isMainWorld())
    149         return m_domTemplateMapForMainWorld;
    150     return m_domTemplateMapForNonMainWorld;
    151 }
    152 
    153 v8::Handle<v8::FunctionTemplate> V8PerIsolateData::domTemplate(void* domTemplateKey, v8::FunctionCallback callback, v8::Handle<v8::Value> data, v8::Handle<v8::Signature> signature, int length)
    154 {
    155     DOMTemplateMap& domTemplateMap = currentDOMTemplateMap();
    156     DOMTemplateMap::iterator result = domTemplateMap.find(domTemplateKey);
    157     if (result != domTemplateMap.end())
    158         return result->value.Get(isolate());
    159 
    160     v8::Local<v8::FunctionTemplate> templ = v8::FunctionTemplate::New(isolate(), callback, data, signature, length);
    161     domTemplateMap.add(domTemplateKey, v8::Eternal<v8::FunctionTemplate>(isolate(), templ));
    162     return templ;
    163 }
    164 
    165 v8::Handle<v8::FunctionTemplate> V8PerIsolateData::existingDOMTemplate(void* domTemplateKey)
    166 {
    167     DOMTemplateMap& domTemplateMap = currentDOMTemplateMap();
    168     DOMTemplateMap::iterator result = domTemplateMap.find(domTemplateKey);
    169     if (result != domTemplateMap.end())
    170         return result->value.Get(isolate());
    171     return v8::Local<v8::FunctionTemplate>();
    172 }
    173 
    174 void V8PerIsolateData::setDOMTemplate(void* domTemplateKey, v8::Handle<v8::FunctionTemplate> templ)
    175 {
    176     currentDOMTemplateMap().add(domTemplateKey, v8::Eternal<v8::FunctionTemplate>(isolate(), v8::Local<v8::FunctionTemplate>(templ)));
    177 }
    178 
    179 v8::Local<v8::Context> V8PerIsolateData::ensureScriptRegexpContext()
    180 {
    181     if (!m_scriptRegexpScriptState) {
    182         v8::Local<v8::Context> context(v8::Context::New(isolate()));
    183         m_scriptRegexpScriptState = ScriptState::create(context, DOMWrapperWorld::create());
    184     }
    185     return m_scriptRegexpScriptState->context();
    186 }
    187 
    188 bool V8PerIsolateData::hasInstance(const WrapperTypeInfo* info, v8::Handle<v8::Value> value)
    189 {
    190     return hasInstance(info, value, m_domTemplateMapForMainWorld)
    191         || hasInstance(info, value, m_domTemplateMapForNonMainWorld);
    192 }
    193 
    194 bool V8PerIsolateData::hasInstance(const WrapperTypeInfo* info, v8::Handle<v8::Value> value, DOMTemplateMap& domTemplateMap)
    195 {
    196     DOMTemplateMap::iterator result = domTemplateMap.find(info);
    197     if (result == domTemplateMap.end())
    198         return false;
    199     v8::Handle<v8::FunctionTemplate> templ = result->value.Get(isolate());
    200     return templ->HasInstance(value);
    201 }
    202 
    203 v8::Handle<v8::Object> V8PerIsolateData::findInstanceInPrototypeChain(const WrapperTypeInfo* info, v8::Handle<v8::Value> value)
    204 {
    205     v8::Handle<v8::Object> wrapper = findInstanceInPrototypeChain(info, value, m_domTemplateMapForMainWorld);
    206     if (!wrapper.IsEmpty())
    207         return wrapper;
    208     return findInstanceInPrototypeChain(info, value, m_domTemplateMapForNonMainWorld);
    209 }
    210 
    211 v8::Handle<v8::Object> V8PerIsolateData::findInstanceInPrototypeChain(const WrapperTypeInfo* info, v8::Handle<v8::Value> value, DOMTemplateMap& domTemplateMap)
    212 {
    213     if (value.IsEmpty() || !value->IsObject())
    214         return v8::Handle<v8::Object>();
    215     DOMTemplateMap::iterator result = domTemplateMap.find(info);
    216     if (result == domTemplateMap.end())
    217         return v8::Handle<v8::Object>();
    218     v8::Handle<v8::FunctionTemplate> templ = result->value.Get(isolate());
    219     return v8::Handle<v8::Object>::Cast(value)->FindInstanceInPrototypeChain(templ);
    220 }
    221 
    222 static void constructorOfToString(const v8::FunctionCallbackInfo<v8::Value>& info)
    223 {
    224     // The DOM constructors' toString functions grab the current toString
    225     // for Functions by taking the toString function of itself and then
    226     // calling it with the constructor as its receiver. This means that
    227     // changes to the Function prototype chain or toString function are
    228     // reflected when printing DOM constructors. The only wart is that
    229     // changes to a DOM constructor's toString's toString will cause the
    230     // toString of the DOM constructor itself to change. This is extremely
    231     // obscure and unlikely to be a problem.
    232     v8::Handle<v8::Value> value = info.Callee()->Get(v8AtomicString(info.GetIsolate(), "toString"));
    233     if (!value->IsFunction()) {
    234         v8SetReturnValue(info, v8::String::Empty(info.GetIsolate()));
    235         return;
    236     }
    237     v8SetReturnValue(info, V8ScriptRunner::callInternalFunction(v8::Handle<v8::Function>::Cast(value), info.This(), 0, 0, info.GetIsolate()));
    238 }
    239 
    240 v8::Handle<v8::FunctionTemplate> V8PerIsolateData::toStringTemplate()
    241 {
    242     if (m_toStringTemplate.isEmpty())
    243         m_toStringTemplate.set(isolate(), v8::FunctionTemplate::New(isolate(), constructorOfToString));
    244     return m_toStringTemplate.newLocal(isolate());
    245 }
    246 
    247 IDBPendingTransactionMonitor* V8PerIsolateData::ensureIDBPendingTransactionMonitor()
    248 {
    249     if (!m_idbPendingTransactionMonitor)
    250         m_idbPendingTransactionMonitor = adoptPtr(new IDBPendingTransactionMonitor());
    251     return m_idbPendingTransactionMonitor.get();
    252 }
    253 
    254 } // namespace blink
    255