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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/core/v8/V8PerContextData.h"
     33 
     34 #include "bindings/core/v8/ScriptState.h"
     35 #include "bindings/core/v8/V8Binding.h"
     36 #include "bindings/core/v8/V8ObjectConstructor.h"
     37 #include "wtf/StringExtras.h"
     38 
     39 #include <stdlib.h>
     40 
     41 namespace blink {
     42 
     43 V8PerContextData::V8PerContextData(v8::Handle<v8::Context> context)
     44     : m_isolate(context->GetIsolate())
     45     , m_wrapperBoilerplates(m_isolate)
     46     , m_constructorMap(m_isolate)
     47     , m_contextHolder(adoptPtr(new gin::ContextHolder(m_isolate)))
     48     , m_context(m_isolate, context)
     49     , m_customElementBindings(adoptPtr(new CustomElementBindingMap()))
     50     , m_activityLogger(0)
     51     , m_compiledPrivateScript(m_isolate)
     52 {
     53     m_contextHolder->SetContext(context);
     54 
     55     v8::Context::Scope contextScope(context);
     56     ASSERT(m_errorPrototype.isEmpty());
     57     v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(context->Global()->Get(v8AtomicString(m_isolate, "Error")));
     58     ASSERT(!object.IsEmpty());
     59     v8::Handle<v8::Value> prototypeValue = object->Get(v8AtomicString(m_isolate, "prototype"));
     60     ASSERT(!prototypeValue.IsEmpty());
     61     m_errorPrototype.set(m_isolate, prototypeValue);
     62 }
     63 
     64 V8PerContextData::~V8PerContextData()
     65 {
     66 }
     67 
     68 PassOwnPtr<V8PerContextData> V8PerContextData::create(v8::Handle<v8::Context> context)
     69 {
     70     return adoptPtr(new V8PerContextData(context));
     71 }
     72 
     73 V8PerContextData* V8PerContextData::from(v8::Handle<v8::Context> context)
     74 {
     75     return ScriptState::from(context)->perContextData();
     76 }
     77 
     78 v8::Local<v8::Object> V8PerContextData::createWrapperFromCacheSlowCase(const WrapperTypeInfo* type)
     79 {
     80     ASSERT(!m_errorPrototype.isEmpty());
     81 
     82     v8::Context::Scope scope(context());
     83     v8::Local<v8::Function> function = constructorForType(type);
     84     v8::Local<v8::Object> instanceTemplate = V8ObjectConstructor::newInstance(m_isolate, function);
     85     if (!instanceTemplate.IsEmpty()) {
     86         m_wrapperBoilerplates.Set(type, instanceTemplate);
     87         return instanceTemplate->Clone();
     88     }
     89     return v8::Local<v8::Object>();
     90 }
     91 
     92 v8::Local<v8::Function> V8PerContextData::constructorForTypeSlowCase(const WrapperTypeInfo* type)
     93 {
     94     ASSERT(!m_errorPrototype.isEmpty());
     95 
     96     v8::Context::Scope scope(context());
     97     v8::Handle<v8::FunctionTemplate> functionTemplate = type->domTemplate(m_isolate);
     98     // Getting the function might fail if we're running out of stack or memory.
     99     v8::TryCatch tryCatch;
    100     v8::Local<v8::Function> function = functionTemplate->GetFunction();
    101     if (function.IsEmpty())
    102         return v8::Local<v8::Function>();
    103 
    104     if (type->parentClass) {
    105         v8::Local<v8::Object> prototypeTemplate = constructorForType(type->parentClass);
    106         if (prototypeTemplate.IsEmpty())
    107             return v8::Local<v8::Function>();
    108         function->SetPrototype(prototypeTemplate);
    109     }
    110 
    111     v8::Local<v8::Value> prototypeValue = function->Get(v8AtomicString(m_isolate, "prototype"));
    112     if (!prototypeValue.IsEmpty() && prototypeValue->IsObject()) {
    113         v8::Local<v8::Object> prototypeObject = v8::Local<v8::Object>::Cast(prototypeValue);
    114         if (prototypeObject->InternalFieldCount() == v8PrototypeInternalFieldcount
    115             && type->wrapperTypePrototype == WrapperTypeInfo::WrapperTypeObjectPrototype)
    116             prototypeObject->SetAlignedPointerInInternalField(v8PrototypeTypeIndex, const_cast<WrapperTypeInfo*>(type));
    117         type->installConditionallyEnabledMethods(prototypeObject, m_isolate);
    118         if (type->wrapperTypePrototype == WrapperTypeInfo::WrapperTypeExceptionPrototype)
    119             prototypeObject->SetPrototype(m_errorPrototype.newLocal(m_isolate));
    120     }
    121 
    122     m_constructorMap.Set(type, function);
    123 
    124     return function;
    125 }
    126 
    127 v8::Local<v8::Object> V8PerContextData::prototypeForType(const WrapperTypeInfo* type)
    128 {
    129     v8::Local<v8::Object> constructor = constructorForType(type);
    130     if (constructor.IsEmpty())
    131         return v8::Local<v8::Object>();
    132     return constructor->Get(v8String(m_isolate, "prototype")).As<v8::Object>();
    133 }
    134 
    135 void V8PerContextData::addCustomElementBinding(CustomElementDefinition* definition, PassOwnPtr<CustomElementBinding> binding)
    136 {
    137     ASSERT(!m_customElementBindings->contains(definition));
    138     m_customElementBindings->add(definition, binding);
    139 }
    140 
    141 void V8PerContextData::clearCustomElementBinding(CustomElementDefinition* definition)
    142 {
    143     CustomElementBindingMap::iterator it = m_customElementBindings->find(definition);
    144     ASSERT_WITH_SECURITY_IMPLICATION(it != m_customElementBindings->end());
    145     m_customElementBindings->remove(it);
    146 }
    147 
    148 CustomElementBinding* V8PerContextData::customElementBinding(CustomElementDefinition* definition)
    149 {
    150     CustomElementBindingMap::const_iterator it = m_customElementBindings->find(definition);
    151     ASSERT_WITH_SECURITY_IMPLICATION(it != m_customElementBindings->end());
    152     return it->value.get();
    153 }
    154 
    155 
    156 static v8::Handle<v8::Value> createDebugData(const char* worldName, int debugId, v8::Isolate* isolate)
    157 {
    158     char buffer[32];
    159     unsigned wanted;
    160     if (debugId == -1)
    161         wanted = snprintf(buffer, sizeof(buffer), "%s", worldName);
    162     else
    163         wanted = snprintf(buffer, sizeof(buffer), "%s,%d", worldName, debugId);
    164 
    165     if (wanted < sizeof(buffer))
    166         return v8AtomicString(isolate, buffer);
    167 
    168     return v8::Undefined(isolate);
    169 }
    170 
    171 static v8::Handle<v8::Value> debugData(v8::Handle<v8::Context> context)
    172 {
    173     v8::Context::Scope contextScope(context);
    174     return context->GetEmbedderData(v8ContextDebugIdIndex);
    175 }
    176 
    177 static void setDebugData(v8::Handle<v8::Context> context, v8::Handle<v8::Value> value)
    178 {
    179     v8::Context::Scope contextScope(context);
    180     context->SetEmbedderData(v8ContextDebugIdIndex, value);
    181 }
    182 
    183 bool V8PerContextDebugData::setContextDebugData(v8::Handle<v8::Context> context, const char* worldName, int debugId)
    184 {
    185     if (!debugData(context)->IsUndefined())
    186         return false;
    187     v8::HandleScope scope(context->GetIsolate());
    188     v8::Handle<v8::Value> debugData = createDebugData(worldName, debugId, context->GetIsolate());
    189     setDebugData(context, debugData);
    190     return true;
    191 }
    192 
    193 int V8PerContextDebugData::contextDebugId(v8::Handle<v8::Context> context)
    194 {
    195     v8::HandleScope scope(context->GetIsolate());
    196     v8::Handle<v8::Value> data = debugData(context);
    197 
    198     if (!data->IsString())
    199         return -1;
    200     v8::String::Utf8Value utf8(data);
    201     char* comma = strnstr(*utf8, ",", utf8.length());
    202     if (!comma)
    203         return -1;
    204     return atoi(comma + 1);
    205 }
    206 
    207 v8::Handle<v8::Value> V8PerContextData::compiledPrivateScript(String className)
    208 {
    209     return m_compiledPrivateScript.Get(className);
    210 }
    211 
    212 void V8PerContextData::setCompiledPrivateScript(String className, v8::Handle<v8::Value> compiledObject)
    213 {
    214     m_compiledPrivateScript.Set(className, compiledObject);
    215 }
    216 
    217 } // namespace blink
    218