WIP: Reland CompiledScript, prototype compiling in a separate task.

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

+// Copyright 2016 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 CompiledScript_h
+#define CompiledScript_h
+
+#include "bindings/core/v8/ScriptSourceCode.h"
+#include "core/CoreExport.h"
+#include "core/dom/ContextLifecycleObserver.h"
+#include "platform/heap/GarbageCollected.h"
+#include "wtf/Assertions.h"
+#include "wtf/text/TextPosition.h"
+
+#include <v8.h>
+
+namespace blink {
+
+// This wraps a global handle on a V8 object (the compiled script).
+// It is tied to a particular ExecutionContext, and will clear the reference to
+// avoid long-lasting references which may induce cycles between V8 and Oilpan.
+class CORE_EXPORT CompiledScript final
+    : public GarbageCollectedFinalized<CompiledScript>,
+      public ContextLifecycleObserver {
+  USING_GARBAGE_COLLECTED_MIXIN(CompiledScript);
+
+ public:
+  CompiledScript(ExecutionContext*,
+                 v8::Local<v8::Script>,
+                 const ScriptSourceCode&);
+  ~CompiledScript();
+
+  // Callers must accept that this could return an empty handle.
+  // For instance, the compiled script may have been destroyed due to context
+  // shutdown, or the execution context may not match the one this is compiled
+  // for.
+  v8::Local<v8::Script> getScript(ExecutionContext*) const;
+
+  const ScriptSourceCode& sourceCode() const { return m_sourceCode; }
+  const KURL& url() const { return m_sourceCode.url(); }
+  const TextPosition& startPosition() const {
+    return m_sourceCode.startPosition();
+  }
+
+  DEFINE_INLINE_TRACE() {
+    ContextLifecycleObserver::trace(visitor);
+    visitor->trace(m_sourceCode);
+  }
+
+  // ContextLifecycleObserver
+  void contextDestroyed(ExecutionContext*) override;
+
+ private:
+  ScriptSourceCode m_sourceCode;
+  v8::Global<v8::Script> m_script;
+};
+
+}  // namespace blink
+
+#endif  // CompiledScript_h