Revert of Remove V8RecrusionScope, cleanup call sites.

third_party/WebKit/Source/bindings/core/v8/V8RecursionScope.h

+/*
+ * Copyright (C) 2011 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef V8RecursionScope_h
+#define V8RecursionScope_h
+
+#include "bindings/core/v8/V8PerIsolateData.h"
+#include "core/CoreExport.h"
+#include "wtf/Noncopyable.h"
+#include <v8.h>
+
+namespace blink {
+
+// C++ calls into script contexts which are "owned" by WebKit (created in a
+// process where WebKit.cpp initializes v8) must declare their type:
+//
+//   1. Calls into page/author script from a frame
+//   2. Calls into page/author script from a worker
+//   3. Calls into internal script (typically setup/teardown work)
+//
+// Debug-time checking of this is enforced via this class.
+//
+// Calls of type (1) should generally go through ScriptController, as inspector
+// instrumentation is needed. ScriptController allocates V8RecursionScope for you.
+// Calls of type (2) should always stack-allocate a V8RecursionScope in the same
+// block as the call into script. Calls of type (3) should stack allocate a
+// V8RecursionScope::MicrotaskSuppression -- this skips work that is spec'd to
+// happen at the end of the outer-most script stack frame of calls into page script:
+//
+// http://www.whatwg.org/specs/web-apps/current-work/#perform-a-microtask-checkpoint
+class CORE_EXPORT V8RecursionScope {
+    STACK_ALLOCATED();
+public:
+    explicit V8RecursionScope(v8::Isolate* isolate)
+        : m_scope(isolate, v8::MicrotasksScope::kRunMicrotasks)
+    {
+        ASSERT(isolate->GetMicrotasksPolicy() == v8::MicrotasksPolicy::kScoped);
+    }
+
+    ~V8RecursionScope()
+    {
+    }
+
+    static int recursionLevel(v8::Isolate* isolate)
+    {
+        return v8::MicrotasksScope::GetCurrentDepth(isolate);
+    }
+
+    class MicrotaskSuppression {
+        USING_FAST_MALLOC(MicrotaskSuppression);
+        WTF_MAKE_NONCOPYABLE(MicrotaskSuppression);
+    public:
+        explicit MicrotaskSuppression(v8::Isolate* isolate)
+            : m_scope(isolate, v8::MicrotasksScope::kDoNotRunMicrotasks)
+        {
+        }
+
+        ~MicrotaskSuppression()
+        {
+        }
+
+    private:
+        v8::MicrotasksScope m_scope;
+    };
+
+private:
+    v8::MicrotasksScope m_scope;
+};
+
+} // namespace blink
+
+#endif // V8RecursionScope_h