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      1 /*
      2  * Copyright (C) 2012 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "bindings/v8/V8PerContextData.h"
     33 
     34 #include "bindings/v8/ScriptState.h"
     35 #include "bindings/v8/V8Binding.h"
     36 #include "bindings/v8/V8ObjectConstructor.h"
     37 #include "wtf/StringExtras.h"
     38 
     39 #include <stdlib.h>
     40 
     41 namespace WebCore {
     42 
     43 V8PerContextData::V8PerContextData(v8::Handle<v8::Context> context)
     44     : m_wrapperBoilerplates(context->GetIsolate())
     45     , m_constructorMap(context->GetIsolate())
     46     , m_isolate(context->GetIsolate())
     47     , m_contextHolder(adoptPtr(new gin::ContextHolder(context->GetIsolate())))
     48     , m_context(m_isolate, context)
     49     , m_customElementBindings(adoptPtr(new CustomElementBindingMap()))
     50     , m_activityLogger(0)
     51 {
     52     m_contextHolder->SetContext(context);
     53 
     54     v8::Context::Scope contextScope(context);
     55     ASSERT(m_errorPrototype.isEmpty());
     56     v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(context->Global()->Get(v8AtomicString(m_isolate, "Error")));
     57     ASSERT(!object.IsEmpty());
     58     v8::Handle<v8::Value> prototypeValue = object->Get(v8AtomicString(m_isolate, "prototype"));
     59     ASSERT(!prototypeValue.IsEmpty());
     60     m_errorPrototype.set(m_isolate, prototypeValue);
     61 }
     62 
     63 V8PerContextData::~V8PerContextData()
     64 {
     65 }
     66 
     67 PassOwnPtr<V8PerContextData> V8PerContextData::create(v8::Handle<v8::Context> context)
     68 {
     69     return adoptPtr(new V8PerContextData(context));
     70 }
     71 
     72 V8PerContextData* V8PerContextData::from(v8::Handle<v8::Context> context)
     73 {
     74     return ScriptState::from(context)->perContextData();
     75 }
     76 
     77 v8::Local<v8::Object> V8PerContextData::createWrapperFromCacheSlowCase(const WrapperTypeInfo* type)
     78 {
     79     ASSERT(!m_errorPrototype.isEmpty());
     80 
     81     v8::Context::Scope scope(context());
     82     v8::Local<v8::Function> function = constructorForType(type);
     83     v8::Local<v8::Object> instanceTemplate = V8ObjectConstructor::newInstance(m_isolate, function);
     84     if (!instanceTemplate.IsEmpty()) {
     85         m_wrapperBoilerplates.Set(type, instanceTemplate);
     86         return instanceTemplate->Clone();
     87     }
     88     return v8::Local<v8::Object>();
     89 }
     90 
     91 v8::Local<v8::Function> V8PerContextData::constructorForTypeSlowCase(const WrapperTypeInfo* type)
     92 {
     93     ASSERT(!m_errorPrototype.isEmpty());
     94 
     95     v8::Context::Scope scope(context());
     96     v8::Handle<v8::FunctionTemplate> functionTemplate = type->domTemplate(m_isolate);
     97     // Getting the function might fail if we're running out of stack or memory.
     98     v8::TryCatch tryCatch;
     99     v8::Local<v8::Function> function = functionTemplate->GetFunction();
    100     if (function.IsEmpty())
    101         return v8::Local<v8::Function>();
    102 
    103     if (type->parentClass) {
    104         v8::Local<v8::Object> prototypeTemplate = constructorForType(type->parentClass);
    105         if (prototypeTemplate.IsEmpty())
    106             return v8::Local<v8::Function>();
    107         function->SetPrototype(prototypeTemplate);
    108     }
    109 
    110     v8::Local<v8::Value> prototypeValue = function->Get(v8AtomicString(m_isolate, "prototype"));
    111     if (!prototypeValue.IsEmpty() && prototypeValue->IsObject()) {
    112         v8::Local<v8::Object> prototypeObject = v8::Local<v8::Object>::Cast(prototypeValue);
    113         if (prototypeObject->InternalFieldCount() == v8PrototypeInternalFieldcount
    114             && type->wrapperTypePrototype == WrapperTypeObjectPrototype)
    115             prototypeObject->SetAlignedPointerInInternalField(v8PrototypeTypeIndex, const_cast<WrapperTypeInfo*>(type));
    116         type->installPerContextEnabledMethods(prototypeObject, m_isolate);
    117         if (type->wrapperTypePrototype == WrapperTypeExceptionPrototype)
    118             prototypeObject->SetPrototype(m_errorPrototype.newLocal(m_isolate));
    119     }
    120 
    121     m_constructorMap.Set(type, function);
    122 
    123     return function;
    124 }
    125 
    126 v8::Local<v8::Object> V8PerContextData::prototypeForType(const WrapperTypeInfo* type)
    127 {
    128     v8::Local<v8::Object> constructor = constructorForType(type);
    129     if (constructor.IsEmpty())
    130         return v8::Local<v8::Object>();
    131     return constructor->Get(v8String(m_isolate, "prototype")).As<v8::Object>();
    132 }
    133 
    134 void V8PerContextData::addCustomElementBinding(CustomElementDefinition* definition, PassOwnPtr<CustomElementBinding> binding)
    135 {
    136     ASSERT(!m_customElementBindings->contains(definition));
    137     m_customElementBindings->add(definition, binding);
    138 }
    139 
    140 void V8PerContextData::clearCustomElementBinding(CustomElementDefinition* definition)
    141 {
    142     CustomElementBindingMap::iterator it = m_customElementBindings->find(definition);
    143     ASSERT_WITH_SECURITY_IMPLICATION(it != m_customElementBindings->end());
    144     m_customElementBindings->remove(it);
    145 }
    146 
    147 CustomElementBinding* V8PerContextData::customElementBinding(CustomElementDefinition* definition)
    148 {
    149     CustomElementBindingMap::const_iterator it = m_customElementBindings->find(definition);
    150     ASSERT_WITH_SECURITY_IMPLICATION(it != m_customElementBindings->end());
    151     return it->value.get();
    152 }
    153 
    154 
    155 static v8::Handle<v8::Value> createDebugData(const char* worldName, int debugId, v8::Isolate* isolate)
    156 {
    157     char buffer[32];
    158     unsigned wanted;
    159     if (debugId == -1)
    160         wanted = snprintf(buffer, sizeof(buffer), "%s", worldName);
    161     else
    162         wanted = snprintf(buffer, sizeof(buffer), "%s,%d", worldName, debugId);
    163 
    164     if (wanted < sizeof(buffer))
    165         return v8AtomicString(isolate, buffer);
    166 
    167     return v8::Undefined(isolate);
    168 }
    169 
    170 static v8::Handle<v8::Value> debugData(v8::Handle<v8::Context> context)
    171 {
    172     v8::Context::Scope contextScope(context);
    173     return context->GetEmbedderData(v8ContextDebugIdIndex);
    174 }
    175 
    176 static void setDebugData(v8::Handle<v8::Context> context, v8::Handle<v8::Value> value)
    177 {
    178     v8::Context::Scope contextScope(context);
    179     context->SetEmbedderData(v8ContextDebugIdIndex, value);
    180 }
    181 
    182 bool V8PerContextDebugData::setContextDebugData(v8::Handle<v8::Context> context, const char* worldName, int debugId)
    183 {
    184     if (!debugData(context)->IsUndefined())
    185         return false;
    186     v8::HandleScope scope(context->GetIsolate());
    187     v8::Handle<v8::Value> debugData = createDebugData(worldName, debugId, context->GetIsolate());
    188     setDebugData(context, debugData);
    189     return true;
    190 }
    191 
    192 int V8PerContextDebugData::contextDebugId(v8::Handle<v8::Context> context)
    193 {
    194     v8::HandleScope scope(context->GetIsolate());
    195     v8::Handle<v8::Value> data = debugData(context);
    196 
    197     if (!data->IsString())
    198         return -1;
    199     v8::String::Utf8Value utf8(data);
    200     char* comma = strnstr(*utf8, ",", utf8.length());
    201     if (!comma)
    202         return -1;
    203     return atoi(comma + 1);
    204 }
    205 
    206 } // namespace WebCore
    207