Add [CachedAccessor] attribute to cache (almost) constant accessors (window.document).

third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp b/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp
index 77d1a1ab3dc07c8734a8aef35a79b05615d20f55..95b0c0f1783ab32978c64b483c5ea6ae9fe7f0ba 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.cpp
@@ -31,6 +31,7 @@
 #include "bindings/core/v8/GeneratedCodeHelper.h" // just for DCHECK
 #include "bindings/core/v8/V8ObjectConstructor.h"
 #include "bindings/core/v8/V8PerContextData.h"
+#include "bindings/core/v8/WindowProxy.h"
 #include "platform/TraceEvent.h"
 
 namespace blink {
@@ -91,10 +92,10 @@ void installAttributeInternal(v8::Isolate* isolate, v8::Local<v8::Object> instan
 }
 
 template <class FunctionOrTemplate>
-v8::Local<FunctionOrTemplate> createAccessorFunctionOrTemplate(v8::Isolate*, v8::FunctionCallback, V8DOMConfiguration::FastAccessorBuilderCallback, v8::Local<v8::Value> data, v8::Local<v8::Signature>, int length);
+v8::Local<FunctionOrTemplate> createAccessorFunctionOrTemplate(v8::Isolate*, v8::FunctionCallback, V8DOMConfiguration::FastAccessorBuilderCallback, V8DOMConfiguration::PrivatePropertyCallback, v8::Local<v8::Value> data, v8::Local<v8::Signature>, int length);
 
 template <>
-v8::Local<v8::FunctionTemplate> createAccessorFunctionOrTemplate<v8::FunctionTemplate>(v8::Isolate* isolate, v8::FunctionCallback callback, V8DOMConfiguration::FastAccessorBuilderCallback fastCallback, v8::Local<v8::Value> data, v8::Local<v8::Signature> signature, int length)
+v8::Local<v8::FunctionTemplate> createAccessorFunctionOrTemplate<v8::FunctionTemplate>(v8::Isolate* isolate, v8::FunctionCallback callback, V8DOMConfiguration::FastAccessorBuilderCallback fastCallback, V8DOMConfiguration::PrivatePropertyCallback cacheProperty, v8::Local<v8::Value> data, v8::Local<v8::Signature> signature, int length)

[haraken, 2016/09/20 14:15:03]

cachedAccessorCallback ?

 {
     v8::Local<v8::FunctionTemplate> functionTemplate;
     if (callback) {
@@ -104,7 +105,12 @@ v8::Local<v8::FunctionTemplate> createAccessorFunctionOrTemplate<v8::FunctionTem
             DCHECK(fab);
             functionTemplate = v8::FunctionTemplate::NewWithFastHandler(isolate, callback, fab, data, signature, length);
         } else {
-            functionTemplate = v8::FunctionTemplate::New(isolate, callback, data, signature, length);
+            if (cacheProperty) {
+                functionTemplate = v8::FunctionTemplate::NewWithCache(isolate, callback,
+                    cacheProperty(isolate), data, signature, length);
+            } else {
+                functionTemplate = v8::FunctionTemplate::New(isolate, callback, data, signature, length);
+            }
         }
 
         if (!functionTemplate.IsEmpty()) {
@@ -116,12 +122,12 @@ v8::Local<v8::FunctionTemplate> createAccessorFunctionOrTemplate<v8::FunctionTem
 }
 
 template <>
-v8::Local<v8::Function> createAccessorFunctionOrTemplate<v8::Function>(v8::Isolate* isolate, v8::FunctionCallback callback, V8DOMConfiguration::FastAccessorBuilderCallback, v8::Local<v8::Value> data, v8::Local<v8::Signature> signature, int length)
+v8::Local<v8::Function> createAccessorFunctionOrTemplate<v8::Function>(v8::Isolate* isolate, v8::FunctionCallback callback, V8DOMConfiguration::FastAccessorBuilderCallback, V8DOMConfiguration::PrivatePropertyCallback, v8::Local<v8::Value> data, v8::Local<v8::Signature> signature, int length)
 {
     if (!callback)
         return v8::Local<v8::Function>();
 
-    v8::Local<v8::FunctionTemplate> functionTemplate = createAccessorFunctionOrTemplate<v8::FunctionTemplate>(isolate, callback, nullptr, data, signature, length);
+    v8::Local<v8::FunctionTemplate> functionTemplate = createAccessorFunctionOrTemplate<v8::FunctionTemplate>(isolate, callback, nullptr, nullptr, data, signature, length);
     if (functionTemplate.IsEmpty())
         return v8::Local<v8::Function>();
 
@@ -162,8 +168,8 @@ void installAccessorInternal(v8::Isolate* isolate, v8::Local<ObjectOrTemplate> i
 
     if (accessor.propertyLocationConfiguration &
         (V8DOMConfiguration::OnInstance | V8DOMConfiguration::OnPrototype)) {
-        v8::Local<FunctionOrTemplate> getter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, getterCallback, fastGetterCallback, data, signature, 0);
-        v8::Local<FunctionOrTemplate> setter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, setterCallback, nullptr, data, signature, 1);
+        v8::Local<FunctionOrTemplate> getter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, getterCallback, fastGetterCallback, accessor.cachePropertyCallback, data, signature, 0);
+        v8::Local<FunctionOrTemplate> setter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, setterCallback, nullptr, 0, data, signature, 1);
         if (accessor.propertyLocationConfiguration & V8DOMConfiguration::OnInstance)
             instanceOrTemplate->SetAccessorProperty(name, getter, setter, static_cast<v8::PropertyAttribute>(accessor.attribute), static_cast<v8::AccessControl>(accessor.settings));
         if (accessor.propertyLocationConfiguration & V8DOMConfiguration::OnPrototype)
@@ -173,8 +179,8 @@ void installAccessorInternal(v8::Isolate* isolate, v8::Local<ObjectOrTemplate> i
         // Attributes installed on the interface object must be static
         // attributes, so no need to specify a signature, i.e. no need to do
         // type check against a holder.
-        v8::Local<FunctionOrTemplate> getter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, getterCallback, fastGetterCallback, data, v8::Local<v8::Signature>(), 0);
-        v8::Local<FunctionOrTemplate> setter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, setterCallback, nullptr, data, v8::Local<v8::Signature>(), 1);
+        v8::Local<FunctionOrTemplate> getter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, getterCallback, fastGetterCallback, 0, data, v8::Local<v8::Signature>(), 0);
+        v8::Local<FunctionOrTemplate> setter = createAccessorFunctionOrTemplate<FunctionOrTemplate>(isolate, setterCallback, nullptr, 0, data, v8::Local<v8::Signature>(), 1);
         interfaceOrTemplate->SetAccessorProperty(name, getter, setter, static_cast<v8::PropertyAttribute>(accessor.attribute), static_cast<v8::AccessControl>(accessor.settings));
     }
 }