--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/JavaScriptCore/runtime/JSImmediate.h Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,723 @@
+/*
+ * 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