Merge WebKit at r84325: Initial merge by git.

Change-Id: Ic1a909300ecc0a13ddc6b4e784371d2ac6e3d59b

1 files changed, 78 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/heap/LocalScope.h b/Source/JavaScriptCore/heap/LocalScope.h
new file mode 100644
index 0000000..cd27b32
--- /dev/null
+++ b/Source/JavaScriptCore/heap/LocalScope.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2010 Apple 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
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 LocalScope_h
+#define LocalScope_h
+
+#include "HandleStack.h"
+#include "Local.h"
+
+namespace JSC {
+/*  
+    A LocalScope is a temporary scope in which Locals are allocated. When a
+    LocalScope goes out of scope, all the Locals created in it are destroyed.
+
+    LocalScope is similar in concept to NSAutoreleasePool.
+*/
+
+class JSGlobalData;
+
+class LocalScope {
+public:
+    explicit LocalScope(JSGlobalData&);
+    ~LocalScope();
+    
+    template <typename T> Local<T> release(Local<T>); // Destroys all other locals in the scope.
+
+private:
+    HandleStack* m_handleStack;
+    HandleStack::Frame m_lastFrame;
+};
+
+inline LocalScope::LocalScope(JSGlobalData& globalData)
+    : m_handleStack(globalData.heap.handleStack())
+{
+    m_handleStack->enterScope(m_lastFrame);
+}
+
+inline LocalScope::~LocalScope()
+{
+    m_handleStack->leaveScope(m_lastFrame);
+}
+
+template <typename T> Local<T> LocalScope::release(Local<T> local)
+{
+    typename Local<T>::ExternalType ptr = local.get();
+
+    m_handleStack->leaveScope(m_lastFrame);
+    HandleSlot slot = m_handleStack->push();
+    m_handleStack->enterScope(m_lastFrame);
+
+    return Local<T>(slot, ptr);
+}
+
+}
+
+#endif