[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/bindings/core/v8/V8SnapshotUtil.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8SnapshotUtil_h
+#define V8SnapshotUtil_h
+
+#include "core/CoreExport.h"
+#include "platform/wtf/Allocator.h"
+#include "v8/include/v8.h"
+
+namespace blink {
+
+class Document;
+class DOMWrapperWorld;
+
+// V8SnapshotUtil supports handling V8 snapshots.

[haraken, 2017/07/06 13:15:54]

// This class contains helper functions to take a V8 context snapshot.

[Yuki, 2017/07/06 14:12:28]

s/to take/to take and use/?

Some of helper functions are meant to use a snapshot.

[peria, 2017/07/07 06:22:03]

Done.

[peria, 2017/07/07 06:22:03]

Acknowledged.

+class CORE_EXPORT V8SnapshotUtil {
+  STATIC_ONLY(V8SnapshotUtil);
+
+ public:
+  static v8::Local<v8::Context> CreateContext(
+      v8::Isolate*,
+      const DOMWrapperWorld&,
+      v8::ExtensionConfiguration*,
+      v8::Local<v8::Object> global_proxy,
+      Document*);
+  // Install runtime enabled features on some v8::Objects in a context
+  // created with a snapshot.
+  static void SetupContext(v8::Local<v8::Context>, Document*);
+
+  static void EnsureInterfaceTemplates(v8::Isolate*);
+
+  static void SetReferenceTable(intptr_t* table);
+  static intptr_t* GetReferenceTable();
+
+  // Do not call this in production.
+  static v8::StartupData TakeSnapshot();
+
+ private:
+  static v8::StartupData SerializeInternalField(v8::Local<v8::Object> holder,
+                                                int index,
+                                                void* data);
+  static void DeserializeInternalField(v8::Local<v8::Object> holder,
+                                       int index,
+                                       v8::StartupData payload,
+                                       void* data);
+  static bool CanCreateContextFromSnapshot(v8::Isolate*,
+                                           const DOMWrapperWorld&,
+                                           Document*);
+
+  static void EnsureInterfaceTemplatesForWorld(v8::Isolate*,
+                                               const DOMWrapperWorld&);
+
+  static void TakeSnapshotForWorld(v8::SnapshotCreator*,
+                                   const DOMWrapperWorld&);
+};
+
+}  // namespace blink
+
+#endif  // V8SnapshotUtil_h