JavaScriptCore-1097.3.tar.gz

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

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+/*
+ * Copyright (C) 2011 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. ``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
+ * 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 HeapBlock_h
+#define HeapBlock_h
+
+#include <wtf/DoublyLinkedList.h>
+#include <wtf/PageAllocationAligned.h>
+#include <wtf/StdLibExtras.h>
+
+namespace JSC {
+
+enum AllocationEffort { AllocationCanFail, AllocationMustSucceed };
+
+class HeapBlock : public DoublyLinkedListNode<HeapBlock> {
+public:
+    HeapBlock(PageAllocationAligned& allocation)
+        : DoublyLinkedListNode<HeapBlock>()
+        , m_prev(0)
+        , m_next(0)
+        , m_allocation(allocation)
+    {
+        ASSERT(allocation);
+    }
+
+    HeapBlock* m_prev;
+    HeapBlock* m_next;
+    PageAllocationAligned m_allocation;
+    
+    static const size_t s_blockSize = 64 * KB;
+};
+
+} // namespace JSC
+
+#endif