[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/platform/bindings/V8PerIsolateData.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 82 matching lines @@
   };
 
   // Use this class to abstract away types of members that are pointers to core/
   // objects, which are simply owned and released by V8PerIsolateData (see
   // m_threadDebugger for an example).
   class PLATFORM_EXPORT Data {
    public:
     virtual ~Data() = default;
   };
 
-  static v8::Isolate* Initialize(WebTaskRunner*);
+  static v8::Isolate* Initialize(WebTaskRunner*,
+                                 intptr_t*,
+                                 gin::IsolateHolder::V8ContextMode);
 
   static V8PerIsolateData* From(v8::Isolate* isolate) {
     DCHECK(isolate);
     DCHECK(isolate->GetData(gin::kEmbedderBlink));
     return static_cast<V8PerIsolateData*>(
         isolate->GetData(gin::kEmbedderBlink));
   }
 
   static void WillBeDestroyed(v8::Isolate*);
   static void Destroy(v8::Isolate*);
   static v8::Isolate* MainThreadIsolate();
 
   static void EnableIdleTasks(v8::Isolate*,
                               std::unique_ptr<gin::V8IdleTaskRunner>);
 
   v8::Isolate* GetIsolate() { return isolate_holder_.isolate(); }
+  v8::SnapshotCreator* GetSnapshotCreator() {
+    return isolate_holder_.snapshot_creator();
+  }
 
   StringCache* GetStringCache() { return string_cache_.get(); }
 
   bool IsHandlingRecursionLevelError() const {
     return is_handling_recursion_level_error_;
   }
   void SetIsHandlingRecursionLevelError(bool value) {
     is_handling_recursion_level_error_ = value;
   }
 
   bool IsReportingException() const { return is_reporting_exception_; }
   void SetReportingException(bool value) { is_reporting_exception_ = value; }
 
   bool IsUseCounterDisabled() const { return use_counter_disabled_; }
 
   V8PrivateProperty* PrivateProperty() { return private_property_.get(); }
 
   // Accessors to the cache of interface templates.
   v8::Local<v8::FunctionTemplate> FindInterfaceTemplate(const DOMWrapperWorld&,
                                                         const void* key);
   void SetInterfaceTemplate(const DOMWrapperWorld&,
                             const void* key,
                             v8::Local<v8::FunctionTemplate>);
+  void ClearPersistents();
+  gin::IsolateHolder::V8ContextMode GetV8ContextMode() const {
+    return isolate_holder_.v8_context_mode();
+  }
 
   // Accessor to the cache of cross-origin accessible operation's templates.
   // Created templates get automatically cached.
   v8::Local<v8::FunctionTemplate> FindOrCreateOperationTemplate(
       const DOMWrapperWorld&,
       const void* key,
       v8::FunctionCallback,
       v8::Local<v8::Value> data,
       v8::Local<v8::Signature>,
       int length);
@@ skipping 61 matching lines @@
 
   void SetScriptWrappableVisitor(
       std::unique_ptr<ScriptWrappableVisitor> visitor) {
     script_wrappable_visitor_ = std::move(visitor);
   }
   ScriptWrappableVisitor* GetScriptWrappableVisitor() {
     return script_wrappable_visitor_.get();
   }
 
  private:
-  explicit V8PerIsolateData(WebTaskRunner*);
+  explicit V8PerIsolateData(WebTaskRunner*,
+                            intptr_t*,
+                            gin::IsolateHolder::V8ContextMode);
   ~V8PerIsolateData();
 
-  typedef HashMap<const void*, v8::Eternal<v8::FunctionTemplate>>
-      V8FunctionTemplateMap;
+  using V8FunctionTemplateMap =
+      HashMap<const void*, v8::Eternal<v8::FunctionTemplate>>;
   V8FunctionTemplateMap& SelectInterfaceTemplateMap(const DOMWrapperWorld&);
   V8FunctionTemplateMap& SelectOperationTemplateMap(const DOMWrapperWorld&);
   bool HasInstance(const WrapperTypeInfo* untrusted,
                    v8::Local<v8::Value>,
                    V8FunctionTemplateMap&);
   v8::Local<v8::Object> FindInstanceInPrototypeChain(const WrapperTypeInfo*,
                                                      v8::Local<v8::Value>,
                                                      V8FunctionTemplateMap&);
 
   gin::IsolateHolder isolate_holder_;
 
-  // m_interfaceTemplateMapFor{,Non}MainWorld holds function templates for
+  // interface_template_map_for_{,non_}main_world holds function templates for
   // the inerface objects.
   V8FunctionTemplateMap interface_template_map_for_main_world_;
   V8FunctionTemplateMap interface_template_map_for_non_main_world_;
+
+  using CopyablePersistent =

[haraken, 2017/05/20 19:10:03]

Would you help me understand why you need to use CopyablePersistent?
CopyablePersistent is highly discouraged.

[peria, 2017/05/30 08:25:44]

Will replace with ScopedPersistent or something usable.

+      v8::Persistent<v8::FunctionTemplate,
+                     v8::CopyablePersistentTraits<v8::FunctionTemplate>>;
+  using V8FunctionTemplatePersistentMap =
+      HashMap<const void*, CopyablePersistent>;
+  V8FunctionTemplatePersistentMap interface_template_persistent_map_;
+
   // m_operationTemplateMapFor{,Non}MainWorld holds function templates for
   // the cross-origin accessible DOM operations.
   V8FunctionTemplateMap operation_template_map_for_main_world_;
   V8FunctionTemplateMap operation_template_map_for_non_main_world_;
 
   // Contains lists of eternal names, such as dictionary keys.
   HashMap<const void*, Vector<v8::Eternal<v8::Name>>> eternal_name_cache_;
 
   std::unique_ptr<StringCache> string_cache_;
   std::unique_ptr<V8PrivateProperty> private_property_;
@@ skipping 11 matching lines @@
   Vector<std::unique_ptr<EndOfScopeTask>> end_of_scope_tasks_;
   std::unique_ptr<Data> thread_debugger_;
 
   Persistent<ActiveScriptWrappableSet> active_script_wrappables_;
   std::unique_ptr<ScriptWrappableVisitor> script_wrappable_visitor_;
 };
 
 }  // namespace blink
 
 #endif  // V8PerIsolateData_h