| /* |
| * 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. ``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. |
| */ |
| |
| #include "config.h" |
| #include "ArrayProfile.h" |
| |
| namespace JSC { |
| |
| void ArrayProfile::computeUpdatedPrediction(OperationInProgress operation) |
| { |
| if (m_lastSeenStructure) { |
| m_observedArrayModes |= arrayModeFromStructure(m_lastSeenStructure); |
| m_mayInterceptIndexedAccesses |= |
| m_lastSeenStructure->typeInfo().interceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero(); |
| if (!m_structureIsPolymorphic) { |
| if (!m_expectedStructure) |
| m_expectedStructure = m_lastSeenStructure; |
| else if (m_expectedStructure != m_lastSeenStructure) { |
| m_expectedStructure = 0; |
| m_structureIsPolymorphic = true; |
| } |
| } |
| m_lastSeenStructure = 0; |
| } |
| |
| if (hasTwoOrMoreBitsSet(m_observedArrayModes)) { |
| m_structureIsPolymorphic = true; |
| m_expectedStructure = 0; |
| } |
| |
| if (operation == Collection |
| && m_expectedStructure |
| && !Heap::isMarked(m_expectedStructure)) { |
| m_expectedStructure = 0; |
| m_structureIsPolymorphic = true; |
| } |
| } |
| |
| } // namespace JSC |
| |
