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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 DataFormat_h
#define DataFormat_h
#include <wtf/Assertions.h>
namespace JSC {
// === DataFormat ===
//
// This enum tracks the current representation in which a value is being held.
// Values may be unboxed primitives (int32, double, or cell), or boxed as a JSValue.
// For boxed values, we may know the type of boxing that has taken place.
// (May also need bool, array, object, string types!)
enum DataFormat {
DataFormatNone = 0,
DataFormatInteger = 1,
DataFormatDouble = 2,
DataFormatBoolean = 3,
DataFormatCell = 4,
DataFormatStorage = 5,
DataFormatJS = 8,
DataFormatJSInteger = DataFormatJS | DataFormatInteger,
DataFormatJSDouble = DataFormatJS | DataFormatDouble,
DataFormatJSCell = DataFormatJS | DataFormatCell,
DataFormatJSBoolean = DataFormatJS | DataFormatBoolean,
// Marker deliminating ordinary data formats and OSR-only data formats.
DataFormatOSRMarker = 32,
// Special data formats used only for OSR.
DataFormatDead = 33, // Implies jsUndefined().
DataFormatArguments = 34 // Implies that the arguments object must be reified.
};
inline const char* dataFormatToString(DataFormat dataFormat)
{
switch (dataFormat) {
case DataFormatNone:
return "None";
case DataFormatInteger:
return "Integer";
case DataFormatDouble:
return "Double";
case DataFormatCell:
return "Cell";
case DataFormatBoolean:
return "Boolean";
case DataFormatStorage:
return "Storage";
case DataFormatJS:
return "JS";
case DataFormatJSInteger:
return "JSInteger";
case DataFormatJSDouble:
return "JSDouble";
case DataFormatJSCell:
return "JSCell";
case DataFormatJSBoolean:
return "JSBoolean";
case DataFormatDead:
return "Dead";
case DataFormatArguments:
return "Arguments";
default:
RELEASE_ASSERT_NOT_REACHED();
return "Unknown";
}
}
#if USE(JSVALUE64)
inline bool needDataFormatConversion(DataFormat from, DataFormat to)
{
ASSERT(from != DataFormatNone);
ASSERT(to != DataFormatNone);
switch (from) {
case DataFormatInteger:
case DataFormatDouble:
return to != from;
case DataFormatCell:
case DataFormatJS:
case DataFormatJSInteger:
case DataFormatJSDouble:
case DataFormatJSCell:
case DataFormatJSBoolean:
switch (to) {
case DataFormatInteger:
case DataFormatDouble:
return true;
case DataFormatCell:
case DataFormatJS:
case DataFormatJSInteger:
case DataFormatJSDouble:
case DataFormatJSCell:
case DataFormatJSBoolean:
return false;
default:
// This captures DataFormatBoolean, which is currently unused.
RELEASE_ASSERT_NOT_REACHED();
}
case DataFormatStorage:
ASSERT(to == DataFormatStorage);
return false;
default:
// This captures DataFormatBoolean, which is currently unused.
RELEASE_ASSERT_NOT_REACHED();
}
return true;
}
#elif USE(JSVALUE32_64)
inline bool needDataFormatConversion(DataFormat from, DataFormat to)
{
ASSERT(from != DataFormatNone);
ASSERT(to != DataFormatNone);
switch (from) {
case DataFormatInteger:
case DataFormatCell:
case DataFormatBoolean:
return ((to & DataFormatJS) || to == DataFormatDouble);
case DataFormatDouble:
case DataFormatJSDouble:
return (to != DataFormatDouble && to != DataFormatJSDouble);
case DataFormatJS:
case DataFormatJSInteger:
case DataFormatJSCell:
case DataFormatJSBoolean:
return (!(to & DataFormatJS) || to == DataFormatJSDouble);
case DataFormatStorage:
ASSERT(to == DataFormatStorage);
return false;
default:
RELEASE_ASSERT_NOT_REACHED();
}
return true;
}
#endif
inline bool isJSFormat(DataFormat format, DataFormat expectedFormat)
{
ASSERT(expectedFormat & DataFormatJS);
return (format | DataFormatJS) == expectedFormat;
}
inline bool isJSInteger(DataFormat format)
{
return isJSFormat(format, DataFormatJSInteger);
}
inline bool isJSDouble(DataFormat format)
{
return isJSFormat(format, DataFormatJSDouble);
}
inline bool isJSCell(DataFormat format)
{
return isJSFormat(format, DataFormatJSCell);
}
inline bool isJSBoolean(DataFormat format)
{
return isJSFormat(format, DataFormatJSBoolean);
}
}
#endif // DataFormat_h
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