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diff --git a/Source/JavaScriptCore/heap/GCAssertions.h b/Source/JavaScriptCore/heap/GCAssertions.h
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+++ b/Source/JavaScriptCore/heap/GCAssertions.h
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+/*
+ * Copyright (C) 2012 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 GCAssertions_h
+#define GCAssertions_h
+
+#include "Assertions.h"
+
+#if ENABLE(GC_VALIDATION)
+#define ASSERT_GC_OBJECT_LOOKS_VALID(cell) do { \
+    if (!(cell))\
+        CRASH();\
+    if (cell->unvalidatedStructure()->unvalidatedStructure() != cell->unvalidatedStructure()->unvalidatedStructure()->unvalidatedStructure())\
+        CRASH();\
+} while (0)
+
+#define ASSERT_GC_OBJECT_INHERITS(object, classInfo) do {\
+    ASSERT_GC_OBJECT_LOOKS_VALID(object); \
+    if (!object->inherits(classInfo)) \
+        CRASH();\
+} while (0)
+
+#else
+#define ASSERT_GC_OBJECT_LOOKS_VALID(cell) do { (void)cell; } while (0)
+#define ASSERT_GC_OBJECT_INHERITS(object, classInfo) do { (void)object; (void)classInfo; } while (0)
+#endif
+
+#if COMPILER_SUPPORTS(HAS_TRIVIAL_DESTRUCTOR)
+#define ASSERT_HAS_TRIVIAL_DESTRUCTOR(klass) COMPILE_ASSERT(__has_trivial_destructor(klass), klass##_has_trivial_destructor_check)
+#else
+#define ASSERT_HAS_TRIVIAL_DESTRUCTOR(klass)
+#endif
+
+#endif // GCAssertions_h