| 1 | /*
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| 2 | * Copyright (C) 2008 Apple Inc. All rights reserved.
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| 3 | *
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| 4 | * Redistribution and use in source and binary forms, with or without
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| 5 | * modification, are permitted provided that the following conditions
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| 6 | * are met:
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| 7 | * 1. Redistributions of source code must retain the above copyright
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| 8 | * notice, this list of conditions and the following disclaimer.
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| 9 | * 2. Redistributions in binary form must reproduce the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer in the
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| 11 | * documentation and/or other materials provided with the distribution.
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| 12 | *
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| 13 | * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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| 14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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| 16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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| 17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| 19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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| 20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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| 21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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| 23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 24 | */
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| 25 |
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| 26 | #include "config.h"
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| 27 | #include "StructureChain.h"
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| 28 |
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| 29 | #include "JSObject.h"
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| 30 | #include "Structure.h"
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| 31 | #include <wtf/RefPtr.h>
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| 32 |
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| 33 | namespace JSC {
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| 34 |
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| 35 | StructureChain::StructureChain(Structure* head)
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| 36 | {
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| 37 | size_t size = 0;
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| 38 | for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
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| 39 | ++size;
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| 40 |
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| 41 | m_vector.set(new RefPtr<Structure>[size + 1]);
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| 42 |
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| 43 | size_t i = 0;
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| 44 | for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
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| 45 | m_vector[i++] = current;
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| 46 | m_vector[i] = 0;
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| 47 | }
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| 48 |
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| 49 | bool StructureChain::isCacheable() const
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| 50 | {
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| 51 | uint32_t i = 0;
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| 52 |
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| 53 | while (m_vector[i]) {
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| 54 | // Both classes of dictionary structure may change arbitrarily so we can't cache them
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| 55 | if (m_vector[i]->isDictionary())
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| 56 | return false;
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| 57 | if (!m_vector[i++]->typeInfo().hasDefaultGetPropertyNames())
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| 58 | return false;
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| 59 | }
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| 60 | return true;
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| 61 | }
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| 62 |
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| 63 | } // namespace JSC
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