JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / runtime / JSArrayBufferViewInlines.h

diff --git a/runtime/JSArrayBufferViewInlines.h b/runtime/JSArrayBufferViewInlines.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. ``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 JSArrayBufferViewInlines_h
+#define JSArrayBufferViewInlines_h
+
+#include "ArrayBufferView.h"
+#include "JSArrayBufferView.h"
+#include "JSDataView.h"
+
+namespace JSC {
+
+inline ArrayBuffer* JSArrayBufferView::buffer()
+{
+    switch (m_mode) {
+    case WastefulTypedArray:
+        return existingBufferInButterfly();
+    case DataViewMode:
+        return jsCast<JSDataView*>(this)->buffer();
+    default:
+        return methodTable()->slowDownAndWasteMemory(this);
+    }
+}
+
+inline ArrayBuffer* JSArrayBufferView::existingBufferInButterfly()
+{
+    ASSERT(m_mode == WastefulTypedArray);
+    return butterfly()->indexingHeader()->arrayBuffer();
+}
+
+inline PassRefPtr<ArrayBufferView> JSArrayBufferView::impl()
+{
+    return methodTable()->getTypedArrayImpl(this);
+}
+
+inline void JSArrayBufferView::neuter()
+{
+    ASSERT(hasArrayBuffer());
+    m_length = 0;
+    m_vector = 0;
+}
+
+inline unsigned JSArrayBufferView::byteOffset()
+{
+    if (!hasArrayBuffer())
+        return 0;
+    
+    ptrdiff_t delta =
+        static_cast<uint8_t*>(m_vector) - static_cast<uint8_t*>(buffer()->data());
+    
+    unsigned result = static_cast<unsigned>(delta);
+    ASSERT(static_cast<ptrdiff_t>(result) == delta);
+    return result;
+}
+
+} // namespace JSC
+
+#endif // JSArrayBufferViewInlines_h
+