JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / heap / RecursiveAllocationScope.h

diff --git a/heap/RecursiveAllocationScope.h b/heap/RecursiveAllocationScope.h
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+/*
+ * Copyright (C) 2013 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 RecursiveAllocationScope_h
+#define RecursiveAllocationScope_h
+
+#include "Heap.h"
+#include "VM.h"
+
+namespace JSC {
+
+class RecursiveAllocationScope {
+public:
+    RecursiveAllocationScope(Heap& heap)
+        : m_heap(heap)
+#ifndef NDEBUG
+        , m_savedObjectClass(heap.vm()->m_initializingObjectClass)
+#endif
+    {
+#ifndef NDEBUG
+        m_heap.vm()->m_initializingObjectClass = nullptr;
+#endif
+        m_heap.m_deferralDepth++; // Make sure that we don't GC.
+    }
+    
+    ~RecursiveAllocationScope()
+    {
+        m_heap.m_deferralDepth--; // Decrement deferal manually so we don't GC when we do so since we are already GCing!.
+#ifndef NDEBUG
+        m_heap.vm()->m_initializingObjectClass = m_savedObjectClass;
+#endif
+    }
+
+private:
+    Heap& m_heap;
+#ifndef NDEBUG
+    const ClassInfo* m_savedObjectClass;
+#endif
+};
+
+}
+
+#endif // RecursiveAllocationScope_h