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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
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include "config.h"
     30 #include "bindings/core/v8/V8DOMConfiguration.h"
     31 
     32 #include "bindings/core/v8/V8ObjectConstructor.h"
     33 #include "platform/TraceEvent.h"
     34 
     35 namespace blink {
     36 
     37 void V8DOMConfiguration::installAttributes(v8::Handle<v8::ObjectTemplate> instanceTemplate, v8::Handle<v8::ObjectTemplate> prototype, const AttributeConfiguration* attributes, size_t attributeCount, v8::Isolate* isolate)
     38 {
     39     for (size_t i = 0; i < attributeCount; ++i)
     40         installAttribute(instanceTemplate, prototype, attributes[i], isolate);
     41 }
     42 
     43 void V8DOMConfiguration::installAccessors(v8::Handle<v8::ObjectTemplate> prototype, v8::Handle<v8::Signature> signature, const AccessorConfiguration* accessors, size_t accessorCount, v8::Isolate* isolate)
     44 {
     45     DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
     46     for (size_t i = 0; i < accessorCount; ++i) {
     47         if (accessors[i].exposeConfiguration == OnlyExposedToPrivateScript && !world.isPrivateScriptIsolatedWorld())
     48             continue;
     49 
     50         v8::FunctionCallback getterCallback = accessors[i].getter;
     51         v8::FunctionCallback setterCallback = accessors[i].setter;
     52         if (world.isMainWorld()) {
     53             if (accessors[i].getterForMainWorld)
     54                 getterCallback = accessors[i].getterForMainWorld;
     55             if (accessors[i].setterForMainWorld)
     56                 setterCallback = accessors[i].setterForMainWorld;
     57         }
     58 
     59         v8::Local<v8::FunctionTemplate> getter;
     60         if (getterCallback) {
     61             getter = v8::FunctionTemplate::New(isolate, getterCallback, v8::External::New(isolate, const_cast<WrapperTypeInfo*>(accessors[i].data)), signature, 0);
     62             getter->RemovePrototype();
     63         }
     64         v8::Local<v8::FunctionTemplate> setter;
     65         if (setterCallback) {
     66             setter = v8::FunctionTemplate::New(isolate, setterCallback, v8::External::New(isolate, const_cast<WrapperTypeInfo*>(accessors[i].data)), signature, 1);
     67             setter->RemovePrototype();
     68         }
     69         prototype->SetAccessorProperty(v8AtomicString(isolate, accessors[i].name), getter, setter, accessors[i].attribute, accessors[i].settings);
     70     }
     71 }
     72 
     73 // Constant installation
     74 //
     75 // installConstants() is be used for simple constants. It installs constants
     76 // using v8::Template::Set(), which results in a property that is much faster to
     77 // access from scripts.
     78 // installConstant() is used when some C++ code needs to be executed when the
     79 // constant is accessed, e.g. to handle deprecation or measuring usage. The
     80 // property appears the same to scripts, but is slower to access.
     81 
     82 void V8DOMConfiguration::installConstants(v8::Handle<v8::FunctionTemplate> functionDescriptor, v8::Handle<v8::ObjectTemplate> prototype, const ConstantConfiguration* constants, size_t constantCount, v8::Isolate* isolate)
     83 {
     84     for (size_t i = 0; i < constantCount; ++i) {
     85         const ConstantConfiguration* constant = &constants[i];
     86         v8::Handle<v8::String> constantName = v8AtomicString(isolate, constant->name);
     87         switch (constant->type) {
     88         case ConstantTypeShort:
     89         case ConstantTypeLong:
     90         case ConstantTypeUnsignedShort:
     91             functionDescriptor->Set(constantName, v8::Integer::New(isolate, constant->ivalue), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
     92             prototype->Set(constantName, v8::Integer::New(isolate, constant->ivalue), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
     93             break;
     94         case ConstantTypeUnsignedLong:
     95             functionDescriptor->Set(constantName, v8::Integer::NewFromUnsigned(isolate, constant->ivalue), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
     96             prototype->Set(constantName, v8::Integer::NewFromUnsigned(isolate, constant->ivalue), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
     97             break;
     98         case ConstantTypeFloat:
     99         case ConstantTypeDouble:
    100             functionDescriptor->Set(constantName, v8::Number::New(isolate, constant->dvalue), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
    101             prototype->Set(constantName, v8::Number::New(isolate, constant->dvalue), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
    102             break;
    103         case ConstantTypeString:
    104             functionDescriptor->Set(constantName, v8::String::NewFromUtf8(isolate, constant->svalue), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
    105             prototype->Set(constantName, v8::String::NewFromUtf8(isolate, constant->svalue), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
    106             break;
    107         default:
    108             ASSERT_NOT_REACHED();
    109         }
    110     }
    111 }
    112 
    113 void V8DOMConfiguration::installConstant(v8::Handle<v8::FunctionTemplate> functionDescriptor, v8::Handle<v8::ObjectTemplate> prototype, const char* name, v8::AccessorGetterCallback getter, v8::Isolate* isolate)
    114 {
    115     v8::Handle<v8::String> constantName = v8AtomicString(isolate, name);
    116     functionDescriptor->SetNativeDataProperty(constantName, getter, 0, v8::Handle<v8::Value>(), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
    117     prototype->SetNativeDataProperty(constantName, getter, 0, v8::Handle<v8::Value>(), static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
    118 }
    119 
    120 void V8DOMConfiguration::installMethods(v8::Handle<v8::ObjectTemplate> prototype, v8::Handle<v8::Signature> signature, v8::PropertyAttribute attributes, const MethodConfiguration* callbacks, size_t callbackCount, v8::Isolate* isolate)
    121 {
    122     for (size_t i = 0; i < callbackCount; ++i)
    123         installMethod(prototype, signature, attributes, callbacks[i], isolate);
    124 }
    125 
    126 v8::Handle<v8::FunctionTemplate> V8DOMConfiguration::functionTemplateForCallback(v8::Handle<v8::Signature> signature, v8::FunctionCallback callback, int length, v8::Isolate* isolate)
    127 {
    128     v8::Local<v8::FunctionTemplate> functionTemplate = v8::FunctionTemplate::New(isolate, callback, v8Undefined(), signature, length);
    129     functionTemplate->RemovePrototype();
    130     return functionTemplate;
    131 }
    132 
    133 v8::Local<v8::Signature> V8DOMConfiguration::installDOMClassTemplate(v8::Handle<v8::FunctionTemplate> functionDescriptor, const char* interfaceName, v8::Handle<v8::FunctionTemplate> parentClass, size_t fieldCount,
    134     const AttributeConfiguration* attributes, size_t attributeCount,
    135     const AccessorConfiguration* accessors, size_t accessorCount,
    136     const MethodConfiguration* callbacks, size_t callbackCount,
    137     v8::Isolate* isolate)
    138 {
    139     functionDescriptor->SetClassName(v8AtomicString(isolate, interfaceName));
    140     v8::Local<v8::ObjectTemplate> instanceTemplate = functionDescriptor->InstanceTemplate();
    141     instanceTemplate->SetInternalFieldCount(fieldCount);
    142     if (!parentClass.IsEmpty()) {
    143         functionDescriptor->Inherit(parentClass);
    144         // Marks the prototype object as one of native-backed objects.
    145         // This is needed since bug 110436 asks WebKit to tell native-initiated prototypes from pure-JS ones.
    146         // This doesn't mark kinds "root" classes like Node, where setting this changes prototype chain structure.
    147         v8::Local<v8::ObjectTemplate> prototype = functionDescriptor->PrototypeTemplate();
    148         prototype->SetInternalFieldCount(v8PrototypeInternalFieldcount);
    149     }
    150 
    151     v8::Local<v8::Signature> defaultSignature = v8::Signature::New(isolate, functionDescriptor);
    152     if (attributeCount)
    153         installAttributes(instanceTemplate, functionDescriptor->PrototypeTemplate(), attributes, attributeCount, isolate);
    154     if (accessorCount)
    155         installAccessors(functionDescriptor->PrototypeTemplate(), defaultSignature, accessors, accessorCount, isolate);
    156     if (callbackCount)
    157         installMethods(functionDescriptor->PrototypeTemplate(), defaultSignature, static_cast<v8::PropertyAttribute>(v8::DontDelete), callbacks, callbackCount, isolate);
    158     return defaultSignature;
    159 }
    160 
    161 v8::Handle<v8::FunctionTemplate> V8DOMConfiguration::domClassTemplate(v8::Isolate* isolate, WrapperTypeInfo* wrapperTypeInfo, void (*configureDOMClassTemplate)(v8::Handle<v8::FunctionTemplate>, v8::Isolate*))
    162 {
    163     V8PerIsolateData* data = V8PerIsolateData::from(isolate);
    164     v8::Local<v8::FunctionTemplate> result = data->existingDOMTemplate(wrapperTypeInfo);
    165     if (!result.IsEmpty())
    166         return result;
    167 
    168     TRACE_EVENT_SCOPED_SAMPLING_STATE("blink", "BuildDOMTemplate");
    169     result = v8::FunctionTemplate::New(isolate, V8ObjectConstructor::isValidConstructorMode);
    170     configureDOMClassTemplate(result, isolate);
    171     data->setDOMTemplate(wrapperTypeInfo, result);
    172     return result;
    173 }
    174 
    175 } // namespace blink
    176