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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. ``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"
#include <wtf/StringExtras.h>
namespace JSC {
const char* arrayModesToString(ArrayModes arrayModes)
{
if (!arrayModes)
return "0:<empty>";
if (arrayModes == ALL_ARRAY_MODES)
return "TOP";
bool isNonArray = !!(arrayModes & NonArray);
bool isNonArrayWithContiguous = !!(arrayModes & NonArrayWithContiguous);
bool isNonArrayWithArrayStorage = !!(arrayModes & NonArrayWithArrayStorage);
bool isNonArrayWithSlowPutArrayStorage = !!(arrayModes & NonArrayWithSlowPutArrayStorage);
bool isArray = !!(arrayModes & ArrayClass);
bool isArrayWithContiguous = !!(arrayModes & ArrayWithContiguous);
bool isArrayWithArrayStorage = !!(arrayModes & ArrayWithArrayStorage);
bool isArrayWithSlowPutArrayStorage = !!(arrayModes & ArrayWithSlowPutArrayStorage);
static char result[256];
snprintf(
result, sizeof(result),
"%u:%s%s%s%s%s%s%s%s",
arrayModes,
isNonArray ? "NonArray" : "",
isNonArrayWithContiguous ? "NonArrayWithContiguous" : "",
isNonArrayWithArrayStorage ? " NonArrayWithArrayStorage" : "",
isNonArrayWithSlowPutArrayStorage ? "NonArrayWithSlowPutArrayStorage" : "",
isArray ? "ArrayClass" : "",
isArrayWithContiguous ? "ArrayWithContiguous" : "",
isArrayWithArrayStorage ? " ArrayWithArrayStorage" : "",
isArrayWithSlowPutArrayStorage ? "ArrayWithSlowPutArrayStorage" : "");
return result;
}
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
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