FCL/sf/mw/qtwebkit: comparison JavaScriptCore/runtime/JSImmediate.h

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+/*
+*  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+*  Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
+*
+*  This library is free software; you can redistribute it and/or
+*  modify it under the terms of the GNU Library General Public
+*  License as published by the Free Software Foundation; either
+*  version 2 of the License, or (at your option) any later version.
+*
+*  This library is distributed in the hope that it will be useful,
+*  but WITHOUT ANY WARRANTY; without even the implied warranty of
+*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+*  Library General Public License for more details.
+*
+*  You should have received a copy of the GNU Library General Public License
+*  along with this library; see the file COPYING.LIB.  If not, write to
+*  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+*  Boston, MA 02110-1301, USA.
+*
+*/
+#ifndef JSImmediate_h
+#define JSImmediate_h
+#if !USE(JSVALUE32_64)
+#include <wtf/Assertions.h>
+#include <wtf/AlwaysInline.h>
+#include <wtf/MathExtras.h>
+#include <wtf/StdLibExtras.h>
+#include "JSValue.h"
+#include <limits>
+#include <limits.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdlib.h>
+namespace JSC {
+class ExecState;
+class JSCell;
+class JSFastMath;
+class JSGlobalData;
+class JSObject;
+class UString;
+#if USE(JSVALUE64)
+inline intptr_t reinterpretDoubleToIntptr(double value)
+{
+return WTF::bitwise_cast<intptr_t>(value);
+}
+inline double reinterpretIntptrToDouble(intptr_t value)
+{
+return WTF::bitwise_cast<double>(value);
+}
+#endif
+/*
+* A JSValue* is either a pointer to a cell (a heap-allocated object) or an immediate (a type-tagged
+* value masquerading as a pointer). The low two bits in a JSValue* are available for type tagging
+* because allocator alignment guarantees they will be 00 in cell pointers.
+*
+* For example, on a 32 bit system:
+*
+* JSCell*:             XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                     00
+*                      [ high 30 bits: pointer address ]  [ low 2 bits -- always 0 ]
+* JSImmediate:         XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                     TT
+*                      [ high 30 bits: 'payload' ]             [ low 2 bits -- tag ]
+*
+* Where the bottom two bits are non-zero they either indicate that the immediate is a 31 bit signed
+* integer, or they mark the value as being an immediate of a type other than integer, with a secondary
+* tag used to indicate the exact type.
+*
+* Where the lowest bit is set (TT is equal to 01 or 11) the high 31 bits form a 31 bit signed int value.
+* Where TT is equal to 10 this indicates this is a type of immediate other than an integer, and the next
+* two bits will form an extended tag.
+*
+* 31 bit signed int:   XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                     X1
+*                      [ high 30 bits of the value ]      [ high bit part of value ]
+* Other:               YYYYYYYYYYYYYYYYYYYYYYYYYYYY      ZZ               10
+*                      [ extended 'payload' ]  [  extended tag  ]  [  tag 'other'  ]
+*
+* Where the first bit of the extended tag is set this flags the value as being a boolean, and the following
+* bit would flag the value as undefined.  If neither bits are set, the value is null.
+*
+* Other:               YYYYYYYYYYYYYYYYYYYYYYYYYYYY      UB               10
+*                      [ extended 'payload' ]  [ undefined | bool ]  [ tag 'other' ]
+*
+* For boolean value the lowest bit in the payload holds the value of the bool, all remaining bits are zero.
+* For undefined or null immediates the payload is zero.
+*
+* Boolean:             000000000000000000000000000V      01               10
+*                      [ boolean value ]              [ bool ]       [ tag 'other' ]
+* Undefined:           0000000000000000000000000000      10               10
+*                      [ zero ]                    [ undefined ]     [ tag 'other' ]
+* Null:                0000000000000000000000000000      00               10
+*                      [ zero ]                       [ zero ]       [ tag 'other' ]
+*/
+/*
+* On 64-bit platforms, we support an alternative encoding form for immediates, if
+* USE(JSVALUE64) is defined.  When this format is used, double precision
+* floating point values may also be encoded as JSImmediates.
+*
+* The encoding makes use of unused NaN space in the IEEE754 representation.  Any value
+* with the top 13 bits set represents a QNaN (with the sign bit set).  QNaN values
+* can encode a 51-bit payload.  Hardware produced and C-library payloads typically
+* have a payload of zero.  We assume that non-zero payloads are available to encode
+* pointer and integer values.  Since any 64-bit bit pattern where the top 15 bits are
+* all set represents a NaN with a non-zero payload, we can use this space in the NaN
+* ranges to encode other values (however there are also other ranges of NaN space that
+* could have been selected).  This range of NaN space is represented by 64-bit numbers
+* begining with the 16-bit hex patterns 0xFFFE and 0xFFFF - we rely on the fact that no
+* valid double-precision numbers will begin fall in these ranges.
+*
+* The scheme we have implemented encodes double precision values by adding 2^48 to the
+* 64-bit integer representation of the number.  After this manipulation, no encoded
+* double-precision value will begin with the pattern 0x0000 or 0xFFFF.
+*
+* The top 16-bits denote the type of the encoded JSImmediate:
+*
+* Pointer: 0000:PPPP:PPPP:PPPP
+*          0001:****:****:****
+* Double:{         ...
+*          FFFE:****:****:****
+* Integer: FFFF:0000:IIII:IIII
+*
+* 32-bit signed integers are marked with the 16-bit tag 0xFFFF.  The tag 0x0000
+* denotes a pointer, or another form of tagged immediate.  Boolean, null and undefined
+* values are encoded in the same manner as the default format.
+*/
+class JSImmediate {
+private:
+friend class JIT;
+friend class JSValue;
+friend class JSFastMath;
+friend class JSInterfaceJIT;
+friend class SpecializedThunkJIT;
+friend JSValue jsNumber(ExecState* exec, double d);
+friend JSValue jsNumber(ExecState*, char i);
+friend JSValue jsNumber(ExecState*, unsigned char i);
+friend JSValue jsNumber(ExecState*, short i);
+friend JSValue jsNumber(ExecState*, unsigned short i);
+friend JSValue jsNumber(ExecState* exec, int i);
+friend JSValue jsNumber(ExecState* exec, unsigned i);
+friend JSValue jsNumber(ExecState* exec, long i);
+friend JSValue jsNumber(ExecState* exec, unsigned long i);
+friend JSValue jsNumber(ExecState* exec, long long i);
+friend JSValue jsNumber(ExecState* exec, unsigned long long i);
+friend JSValue jsNumber(JSGlobalData* globalData, double d);
+friend JSValue jsNumber(JSGlobalData* globalData, short i);
+friend JSValue jsNumber(JSGlobalData* globalData, unsigned short i);
+friend JSValue jsNumber(JSGlobalData* globalData, int i);
+friend JSValue jsNumber(JSGlobalData* globalData, unsigned i);
+friend JSValue jsNumber(JSGlobalData* globalData, long i);
+friend JSValue jsNumber(JSGlobalData* globalData, unsigned long i);
+friend JSValue jsNumber(JSGlobalData* globalData, long long i);
+friend JSValue jsNumber(JSGlobalData* globalData, unsigned long long i);
+#if USE(JSVALUE64)
+// If all bits in the mask are set, this indicates an integer number,
+// if any but not all are set this value is a double precision number.
+static const intptr_t TagTypeNumber = 0xffff000000000000ll;
+// This value is 2^48, used to encode doubles such that the encoded value will begin
+// with a 16-bit pattern within the range 0x0001..0xFFFE.
+static const intptr_t DoubleEncodeOffset = 0x1000000000000ll;
+#elif USE(JSVALUE32)
+static const intptr_t TagTypeNumber = 0x1; // bottom bit set indicates integer, this dominates the following bit
+#endif
+static const intptr_t TagBitTypeOther   = 0x2; // second bit set indicates immediate other than an integer
+static const intptr_t TagMask           = TagTypeNumber | TagBitTypeOther;
+static const intptr_t ExtendedTagMask         = 0xC; // extended tag holds a further two bits
+static const intptr_t ExtendedTagBitBool      = 0x4;
+static const intptr_t ExtendedTagBitUndefined = 0x8;
+static const intptr_t FullTagTypeMask      = TagMask | ExtendedTagMask;
+static const intptr_t FullTagTypeBool      = TagBitTypeOther | ExtendedTagBitBool;
+static const intptr_t FullTagTypeUndefined = TagBitTypeOther | ExtendedTagBitUndefined;
+static const intptr_t FullTagTypeNull      = TagBitTypeOther;
+#if USE(JSVALUE64)
+static const int32_t IntegerPayloadShift  = 0;
+#else
+static const int32_t IntegerPayloadShift  = 1;
+#endif
+static const int32_t ExtendedPayloadShift = 4;
+static const intptr_t ExtendedPayloadBitBoolValue = 1 << ExtendedPayloadShift;
+static const int32_t signBit = 0x80000000;
+static ALWAYS_INLINE bool isImmediate(JSValue v)
+{
+return rawValue(v) & TagMask;
+}
+static ALWAYS_INLINE bool isNumber(JSValue v)
+{
+return rawValue(v) & TagTypeNumber;
+}
+static ALWAYS_INLINE bool isIntegerNumber(JSValue v)
+{
+#if USE(JSVALUE64)
+return (rawValue(v) & TagTypeNumber) == TagTypeNumber;
+#else
+return isNumber(v);
+#endif
+}
+#if USE(JSVALUE64)
+static ALWAYS_INLINE bool isDouble(JSValue v)
+{
+return isNumber(v) && !isIntegerNumber(v);
+}
+#endif
+static ALWAYS_INLINE bool isPositiveIntegerNumber(JSValue v)
+{
+// A single mask to check for the sign bit and the number tag all at once.
+return (rawValue(v) & (signBit | TagTypeNumber)) == TagTypeNumber;
+}
+static ALWAYS_INLINE bool isBoolean(JSValue v)
+{
+return (rawValue(v) & FullTagTypeMask) == FullTagTypeBool;
+}
+static ALWAYS_INLINE bool isUndefinedOrNull(JSValue v)
+{
+// Undefined and null share the same value, bar the 'undefined' bit in the extended tag.
+return (rawValue(v) & ~ExtendedTagBitUndefined) == FullTagTypeNull;
+}
+static JSValue from(char);
+static JSValue from(signed char);
+static JSValue from(unsigned char);
+static JSValue from(short);
+static JSValue from(unsigned short);
+static JSValue from(int);
+static JSValue from(unsigned);
+static JSValue from(long);
+static JSValue from(unsigned long);
+static JSValue from(long long);
+static JSValue from(unsigned long long);
+static JSValue from(double);
+static ALWAYS_INLINE bool isEitherImmediate(JSValue v1, JSValue v2)
+{
+return (rawValue(v1) | rawValue(v2)) & TagMask;
+}
+static ALWAYS_INLINE bool areBothImmediate(JSValue v1, JSValue v2)
+{
+return isImmediate(v1) & isImmediate(v2);
+}
+static ALWAYS_INLINE bool areBothImmediateIntegerNumbers(JSValue v1, JSValue v2)
+{
+#if USE(JSVALUE64)
+return (rawValue(v1) & rawValue(v2) & TagTypeNumber) == TagTypeNumber;
+#else
+return rawValue(v1) & rawValue(v2) & TagTypeNumber;
+#endif
+}
+static double toDouble(JSValue);
+static bool toBoolean(JSValue);
+static bool getUInt32(JSValue, uint32_t&);
+static bool getTruncatedInt32(JSValue, int32_t&);
+static bool getTruncatedUInt32(JSValue, uint32_t&);
+static int32_t getTruncatedInt32(JSValue);
+static uint32_t getTruncatedUInt32(JSValue);
+static JSValue trueImmediate();
+static JSValue falseImmediate();
+static JSValue undefinedImmediate();
+static JSValue nullImmediate();
+static JSValue zeroImmediate();
+static JSValue oneImmediate();
+private:
+#if USE(JSVALUE64)
+static const int minImmediateInt = ((-INT_MAX) - 1);
+static const int maxImmediateInt = INT_MAX;
+#else
+static const int minImmediateInt = ((-INT_MAX) - 1) >> IntegerPayloadShift;
+static const int maxImmediateInt = INT_MAX >> IntegerPayloadShift;
+#endif
+static const unsigned maxImmediateUInt = maxImmediateInt;
+static ALWAYS_INLINE JSValue makeValue(intptr_t integer)
+{
+return JSValue::makeImmediate(integer);
+}
+// With USE(JSVALUE64) we want the argument to be zero extended, so the
+// integer doesn't interfere with the tag bits in the upper word.  In the default encoding,
+// if intptr_t id larger then int32_t we sign extend the value through the upper word.
+#if USE(JSVALUE64)
+static ALWAYS_INLINE JSValue makeInt(uint32_t value)
+#else
+static ALWAYS_INLINE JSValue makeInt(int32_t value)
+#endif
+{
+return makeValue((static_cast<intptr_t>(value) << IntegerPayloadShift) | TagTypeNumber);
+}
+#if USE(JSVALUE64)
+static ALWAYS_INLINE JSValue makeDouble(double value)
+{
+return makeValue(reinterpretDoubleToIntptr(value) + DoubleEncodeOffset);
+}
+#endif
+static ALWAYS_INLINE JSValue makeBool(bool b)
+{
+return makeValue((static_cast<intptr_t>(b) << ExtendedPayloadShift) | FullTagTypeBool);
+}
+static ALWAYS_INLINE JSValue makeUndefined()
+{
+return makeValue(FullTagTypeUndefined);
+}
+static ALWAYS_INLINE JSValue makeNull()
+{
+return makeValue(FullTagTypeNull);
+}
+template<typename T>
+static JSValue fromNumberOutsideIntegerRange(T);
+#if USE(JSVALUE64)
+static ALWAYS_INLINE double doubleValue(JSValue v)
+{
+return reinterpretIntptrToDouble(rawValue(v) - DoubleEncodeOffset);
+}
+#endif
+static ALWAYS_INLINE int32_t intValue(JSValue v)
+{
+return static_cast<int32_t>(rawValue(v) >> IntegerPayloadShift);
+}
+static ALWAYS_INLINE uint32_t uintValue(JSValue v)
+{
+return static_cast<uint32_t>(rawValue(v) >> IntegerPayloadShift);
+}
+static ALWAYS_INLINE bool boolValue(JSValue v)
+{
+return rawValue(v) & ExtendedPayloadBitBoolValue;
+}
+static ALWAYS_INLINE intptr_t rawValue(JSValue v)
+{
+return v.immediateValue();
+}
+};
+ALWAYS_INLINE JSValue JSImmediate::trueImmediate() { return makeBool(true); }
+ALWAYS_INLINE JSValue JSImmediate::falseImmediate() { return makeBool(false); }
+ALWAYS_INLINE JSValue JSImmediate::undefinedImmediate() { return makeUndefined(); }
+ALWAYS_INLINE JSValue JSImmediate::nullImmediate() { return makeNull(); }
+ALWAYS_INLINE JSValue JSImmediate::zeroImmediate() { return makeInt(0); }
+ALWAYS_INLINE JSValue JSImmediate::oneImmediate() { return makeInt(1); }
+#if USE(JSVALUE64)
+inline bool doubleToBoolean(double value)
+{
+return value < 0.0 || value > 0.0;
+}
+ALWAYS_INLINE bool JSImmediate::toBoolean(JSValue v)
+{
+ASSERT(isImmediate(v));
+return isNumber(v) ? isIntegerNumber(v) ? v != zeroImmediate()
+: doubleToBoolean(doubleValue(v)) : v == trueImmediate();
+}
+#else
+ALWAYS_INLINE bool JSImmediate::toBoolean(JSValue v)
+{
+ASSERT(isImmediate(v));
+return isIntegerNumber(v) ? v != zeroImmediate() : v == trueImmediate();
+}
+#endif
+ALWAYS_INLINE uint32_t JSImmediate::getTruncatedUInt32(JSValue v)
+{
+// FIXME: should probably be asserting isPositiveIntegerNumber here.
+ASSERT(isIntegerNumber(v));
+return intValue(v);
+}
+#if USE(JSVALUE64)
+template<typename T>
+inline JSValue JSImmediate::fromNumberOutsideIntegerRange(T value)
+{
+return makeDouble(static_cast<double>(value));
+}
+#else
+template<typename T>
+inline JSValue JSImmediate::fromNumberOutsideIntegerRange(T)
+{
+return JSValue();
+}
+#endif
+ALWAYS_INLINE JSValue JSImmediate::from(char i)
+{
+return makeInt(i);
+}
+ALWAYS_INLINE JSValue JSImmediate::from(signed char i)
+{
+return makeInt(i);
+}
+ALWAYS_INLINE JSValue JSImmediate::from(unsigned char i)
+{
+return makeInt(i);
+}
+ALWAYS_INLINE JSValue JSImmediate::from(short i)
+{
+return makeInt(i);
+}
+ALWAYS_INLINE JSValue JSImmediate::from(unsigned short i)
+{
+return makeInt(i);
+}
+ALWAYS_INLINE JSValue JSImmediate::from(int i)
+{
+#if !USE(JSVALUE64)
+if ((i < minImmediateInt) | (i > maxImmediateInt))
+return fromNumberOutsideIntegerRange(i);
+#endif
+return makeInt(i);
+}
+ALWAYS_INLINE JSValue JSImmediate::from(unsigned i)
+{
+if (i > maxImmediateUInt)
+return fromNumberOutsideIntegerRange(i);
+return makeInt(i);
+}
+ALWAYS_INLINE JSValue JSImmediate::from(long i)
+{
+if ((i < minImmediateInt) | (i > maxImmediateInt))
+return fromNumberOutsideIntegerRange(i);
+return makeInt(i);
+}
+ALWAYS_INLINE JSValue JSImmediate::from(unsigned long i)
+{
+if (i > maxImmediateUInt)
+return fromNumberOutsideIntegerRange(i);
+return makeInt(i);
+}
+ALWAYS_INLINE JSValue JSImmediate::from(long long i)
+{
+if ((i < minImmediateInt) | (i > maxImmediateInt))
+return JSValue();
+return makeInt(static_cast<intptr_t>(i));
+}
+ALWAYS_INLINE JSValue JSImmediate::from(unsigned long long i)
+{
+if (i > maxImmediateUInt)
+return fromNumberOutsideIntegerRange(i);
+return makeInt(static_cast<intptr_t>(i));
+}
+ALWAYS_INLINE JSValue JSImmediate::from(double d)
+{
+const int intVal = static_cast<int>(d);
+// Check for data loss from conversion to int.
+if (intVal != d || (!intVal && signbit(d)))
+return fromNumberOutsideIntegerRange(d);
+return from(intVal);
+}
+ALWAYS_INLINE int32_t JSImmediate::getTruncatedInt32(JSValue v)
+{
+ASSERT(isIntegerNumber(v));
+return intValue(v);
+}
+ALWAYS_INLINE double JSImmediate::toDouble(JSValue v)
+{
+ASSERT(isImmediate(v));
+if (isIntegerNumber(v))
+return intValue(v);
+#if USE(JSVALUE64)
+if (isNumber(v)) {
+ASSERT(isDouble(v));
+return doubleValue(v);
+}
+#else
+ASSERT(!isNumber(v));
+#endif
+if (rawValue(v) == FullTagTypeUndefined)
+return nonInlineNaN();
+ASSERT(JSImmediate::isBoolean(v) || (v == JSImmediate::nullImmediate()));
+return rawValue(v) >> ExtendedPayloadShift;
+}
+ALWAYS_INLINE bool JSImmediate::getUInt32(JSValue v, uint32_t& i)
+{
+i = uintValue(v);
+return isPositiveIntegerNumber(v);
+}
+ALWAYS_INLINE bool JSImmediate::getTruncatedInt32(JSValue v, int32_t& i)
+{
+i = intValue(v);
+return isIntegerNumber(v);
+}
+ALWAYS_INLINE bool JSImmediate::getTruncatedUInt32(JSValue v, uint32_t& i)
+{
+return getUInt32(v, i);
+}
+inline JSValue::JSValue(JSNullTag)
+{
+*this = JSImmediate::nullImmediate();
+}
+inline JSValue::JSValue(JSUndefinedTag)
+{
+*this = JSImmediate::undefinedImmediate();
+}
+inline JSValue::JSValue(JSTrueTag)
+{
+*this = JSImmediate::trueImmediate();
+}
+inline JSValue::JSValue(JSFalseTag)
+{
+*this = JSImmediate::falseImmediate();
+}
+inline bool JSValue::isUndefinedOrNull() const
+{
+return JSImmediate::isUndefinedOrNull(asValue());
+}
+inline bool JSValue::isBoolean() const
+{
+return JSImmediate::isBoolean(asValue());
+}
+inline bool JSValue::isTrue() const
+{
+return asValue() == JSImmediate::trueImmediate();
+}
+inline bool JSValue::isFalse() const
+{
+return asValue() == JSImmediate::falseImmediate();
+}
+inline bool JSValue::getBoolean(bool& v) const
+{
+if (JSImmediate::isBoolean(asValue())) {
+v = JSImmediate::toBoolean(asValue());
+return true;
+}
+return false;
+}
+inline bool JSValue::getBoolean() const
+{
+return asValue() == jsBoolean(true);
+}
+inline bool JSValue::isCell() const
+{
+return !JSImmediate::isImmediate(asValue());
+}
+inline bool JSValue::isInt32() const
+{
+return JSImmediate::isIntegerNumber(asValue());
+}
+inline int32_t JSValue::asInt32() const
+{
+ASSERT(isInt32());
+return JSImmediate::getTruncatedInt32(asValue());
+}
+inline bool JSValue::isUInt32() const
+{
+return JSImmediate::isPositiveIntegerNumber(asValue());
+}
+inline uint32_t JSValue::asUInt32() const
+{
+ASSERT(isUInt32());
+return JSImmediate::getTruncatedUInt32(asValue());
+}
+class JSFastMath {
+public:
+static ALWAYS_INLINE bool canDoFastBitwiseOperations(JSValue v1, JSValue v2)
+{
+return JSImmediate::areBothImmediateIntegerNumbers(v1, v2);
+}
+static ALWAYS_INLINE JSValue equal(JSValue v1, JSValue v2)
+{
+ASSERT(canDoFastBitwiseOperations(v1, v2));
+return jsBoolean(v1 == v2);
+}
+static ALWAYS_INLINE JSValue notEqual(JSValue v1, JSValue v2)
+{
+ASSERT(canDoFastBitwiseOperations(v1, v2));
+return jsBoolean(v1 != v2);
+}
+static ALWAYS_INLINE JSValue andImmediateNumbers(JSValue v1, JSValue v2)
+{
+ASSERT(canDoFastBitwiseOperations(v1, v2));
+return JSImmediate::makeValue(JSImmediate::rawValue(v1) & JSImmediate::rawValue(v2));
+}
+static ALWAYS_INLINE JSValue xorImmediateNumbers(JSValue v1, JSValue v2)
+{
+ASSERT(canDoFastBitwiseOperations(v1, v2));
+return JSImmediate::makeValue((JSImmediate::rawValue(v1) ^ JSImmediate::rawValue(v2)) | JSImmediate::TagTypeNumber);
+}
+static ALWAYS_INLINE JSValue orImmediateNumbers(JSValue v1, JSValue v2)
+{
+ASSERT(canDoFastBitwiseOperations(v1, v2));
+return JSImmediate::makeValue(JSImmediate::rawValue(v1) | JSImmediate::rawValue(v2));
+}
+static ALWAYS_INLINE bool canDoFastRshift(JSValue v1, JSValue v2)
+{
+return JSImmediate::areBothImmediateIntegerNumbers(v1, v2);
+}
+static ALWAYS_INLINE bool canDoFastUrshift(JSValue v1, JSValue v2)
+{
+return JSImmediate::areBothImmediateIntegerNumbers(v1, v2) && !(JSImmediate::rawValue(v1) & JSImmediate::signBit);
+}
+static ALWAYS_INLINE JSValue rightShiftImmediateNumbers(JSValue val, JSValue shift)
+{
+ASSERT(canDoFastRshift(val, shift) || canDoFastUrshift(val, shift));
+#if USE(JSVALUE64)
+return JSImmediate::makeValue(static_cast<intptr_t>(static_cast<uint32_t>(static_cast<int32_t>(JSImmediate::rawValue(val)) >> ((JSImmediate::rawValue(shift) >> JSImmediate::IntegerPayloadShift) & 0x1f))) | JSImmediate::TagTypeNumber);
+#else
+return JSImmediate::makeValue((JSImmediate::rawValue(val) >> ((JSImmediate::rawValue(shift) >> JSImmediate::IntegerPayloadShift) & 0x1f)) | JSImmediate::TagTypeNumber);
+#endif
+}
+static ALWAYS_INLINE bool canDoFastAdditiveOperations(JSValue v)
+{
+// Number is non-negative and an operation involving two of these can't overflow.
+// Checking for allowed negative numbers takes more time than it's worth on SunSpider.
+return (JSImmediate::rawValue(v) & (JSImmediate::TagTypeNumber + (JSImmediate::signBit | (JSImmediate::signBit >> 1)))) == JSImmediate::TagTypeNumber;
+}
+static ALWAYS_INLINE bool canDoFastAdditiveOperations(JSValue v1, JSValue v2)
+{
+// Number is non-negative and an operation involving two of these can't overflow.
+// Checking for allowed negative numbers takes more time than it's worth on SunSpider.
+return canDoFastAdditiveOperations(v1) && canDoFastAdditiveOperations(v2);
+}
+static ALWAYS_INLINE JSValue addImmediateNumbers(JSValue v1, JSValue v2)
+{
+ASSERT(canDoFastAdditiveOperations(v1, v2));
+return JSImmediate::makeValue(JSImmediate::rawValue(v1) + JSImmediate::rawValue(v2) - JSImmediate::TagTypeNumber);
+}
+static ALWAYS_INLINE JSValue subImmediateNumbers(JSValue v1, JSValue v2)
+{
+ASSERT(canDoFastAdditiveOperations(v1, v2));
+return JSImmediate::makeValue(JSImmediate::rawValue(v1) - JSImmediate::rawValue(v2) + JSImmediate::TagTypeNumber);
+}
+static ALWAYS_INLINE JSValue incImmediateNumber(JSValue v)
+{
+ASSERT(canDoFastAdditiveOperations(v));
+return JSImmediate::makeValue(JSImmediate::rawValue(v) + (1 << JSImmediate::IntegerPayloadShift));
+}
+static ALWAYS_INLINE JSValue decImmediateNumber(JSValue v)
+{
+ASSERT(canDoFastAdditiveOperations(v));
+return JSImmediate::makeValue(JSImmediate::rawValue(v) - (1 << JSImmediate::IntegerPayloadShift));
+}
+};
+} // namespace JSC
+#endif // !USE(JSVALUE32_64)
+#endif // JSImmediate_h