runtime/JSNumberCell.h

   1 /*
   2  *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
   4  *  Copyright (C) 2003, 2004, 2005, 2007, 2008 Apple Inc. All rights reserved.
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Library General Public
   8  *  License as published by the Free Software Foundation; either
   9  *  version 2 of the License, or (at your option) any later version.
  10  *
  11  *  This library is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Library General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Library General Public License
  17  *  along with this library; see the file COPYING.LIB.  If not, write to
  18  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  *  Boston, MA 02110-1301, USA.
  20  *
  21  */
  22
  23 #ifndef JSNumberCell_h
  24 #define JSNumberCell_h
  25
  26 #include "CallFrame.h"
  27 #include "JSCell.h"
  28 #include "JSImmediate.h"
  29 #include "Collector.h"
  30 #include "UString.h"
  31 #include <stddef.h> // for size_t
  32
  33 namespace JSC {
  34
  35     extern const double NaN;
  36     extern const double Inf;
  37
  38 #if USE(JSVALUE32)
  39     JSValue jsNumberCell(ExecState*, double);
  40
  41     class Identifier;
  42     class JSCell;
  43     class JSObject;
  44     class JSString;
  45     class PropertySlot;
  46
  47     struct ClassInfo;
  48     struct Instruction;
  49
  50     class JSNumberCell : public JSCell {
  51         friend class JIT;
  52         friend JSValue jsNumberCell(JSGlobalData*, double);
  53         friend JSValue jsNumberCell(ExecState*, double);
  54
  55     public:
  56         double value() const { return m_value; }
  57
  58         virtual JSValue toPrimitive(ExecState*, PreferredPrimitiveType) const;
  59         virtual bool getPrimitiveNumber(ExecState*, double& number, JSValue& value);
  60         virtual bool toBoolean(ExecState*) const;
  61         virtual double toNumber(ExecState*) const;
  62         virtual UString toString(ExecState*) const;
  63         virtual JSObject* toObject(ExecState*) const;
  64
  65         virtual UString toThisString(ExecState*) const;
  66         virtual JSObject* toThisObject(ExecState*) const;
  67         virtual JSValue getJSNumber();
  68
  69         void* operator new(size_t size, ExecState* exec)
  70         {
  71             return exec->heap()->allocateNumber(size);
  72         }
  73
  74         void* operator new(size_t size, JSGlobalData* globalData)
  75         {
  76             return globalData->heap.allocateNumber(size);
  77         }
  78
  79         static PassRefPtr<Structure> createStructure(JSValue proto) { return Structure::create(proto, TypeInfo(NumberType, OverridesGetOwnPropertySlot | NeedsThisConversion), AnonymousSlotCount); }
  80
  81     private:
  82         JSNumberCell(JSGlobalData* globalData, double value)
  83             : JSCell(globalData->numberStructure.get())
  84             , m_value(value)
  85         {
  86         }
  87
  88         JSNumberCell(ExecState* exec, double value)
  89             : JSCell(exec->globalData().numberStructure.get())
  90             , m_value(value)
  91         {
  92         }
  93
  94         virtual bool getUInt32(uint32_t&) const;
  95
  96         double m_value;
  97     };
  98
  99     JSValue jsNumberCell(JSGlobalData*, double);
 100
 101     inline bool isNumberCell(JSValue v)
 102     {
 103         return v.isCell() && v.asCell()->isNumber();
 104     }
 105
 106     inline JSNumberCell* asNumberCell(JSValue v)
 107     {
 108         ASSERT(isNumberCell(v));
 109         return static_cast<JSNumberCell*>(v.asCell());
 110     }
 111
 112     ALWAYS_INLINE JSValue::JSValue(EncodeAsDoubleTag, ExecState* exec, double d)
 113     {
 114         *this = jsNumberCell(exec, d);
 115     }
 116
 117     inline JSValue::JSValue(ExecState* exec, double d)
 118     {
 119         JSValue v = JSImmediate::from(d);
 120         *this = v ? v : jsNumberCell(exec, d);
 121     }
 122
 123     inline JSValue::JSValue(ExecState* exec, int i)
 124     {
 125         JSValue v = JSImmediate::from(i);
 126         *this = v ? v : jsNumberCell(exec, i);
 127     }
 128
 129     inline JSValue::JSValue(ExecState* exec, unsigned i)
 130     {
 131         JSValue v = JSImmediate::from(i);
 132         *this = v ? v : jsNumberCell(exec, i);
 133     }
 134
 135     inline JSValue::JSValue(ExecState* exec, long i)
 136     {
 137         JSValue v = JSImmediate::from(i);
 138         *this = v ? v : jsNumberCell(exec, i);
 139     }
 140
 141     inline JSValue::JSValue(ExecState* exec, unsigned long i)
 142     {
 143         JSValue v = JSImmediate::from(i);
 144         *this = v ? v : jsNumberCell(exec, i);
 145     }
 146
 147     inline JSValue::JSValue(ExecState* exec, long long i)
 148     {
 149         JSValue v = JSImmediate::from(i);
 150         *this = v ? v : jsNumberCell(exec, static_cast<double>(i));
 151     }
 152
 153     inline JSValue::JSValue(ExecState* exec, unsigned long long i)
 154     {
 155         JSValue v = JSImmediate::from(i);
 156         *this = v ? v : jsNumberCell(exec, static_cast<double>(i));
 157     }
 158
 159     inline JSValue::JSValue(JSGlobalData* globalData, double d)
 160     {
 161         JSValue v = JSImmediate::from(d);
 162         *this = v ? v : jsNumberCell(globalData, d);
 163     }
 164
 165     inline JSValue::JSValue(JSGlobalData* globalData, int i)
 166     {
 167         JSValue v = JSImmediate::from(i);
 168         *this = v ? v : jsNumberCell(globalData, i);
 169     }
 170
 171     inline JSValue::JSValue(JSGlobalData* globalData, unsigned i)
 172     {
 173         JSValue v = JSImmediate::from(i);
 174         *this = v ? v : jsNumberCell(globalData, i);
 175     }
 176
 177     inline bool JSValue::isDouble() const
 178     {
 179         return isNumberCell(asValue());
 180     }
 181
 182     inline double JSValue::asDouble() const
 183     {
 184         return asNumberCell(asValue())->value();
 185     }
 186
 187     inline bool JSValue::isNumber() const
 188     {
 189         return JSImmediate::isNumber(asValue()) || isDouble();
 190     }
 191
 192     inline double JSValue::uncheckedGetNumber() const
 193     {
 194         ASSERT(isNumber());
 195         return JSImmediate::isImmediate(asValue()) ? JSImmediate::toDouble(asValue()) : asDouble();
 196     }
 197
 198 #endif // USE(JSVALUE32)
 199
 200 #if USE(JSVALUE64)
 201     ALWAYS_INLINE JSValue::JSValue(EncodeAsDoubleTag, ExecState*, double d)
 202     {
 203         *this = JSImmediate::fromNumberOutsideIntegerRange(d);
 204     }
 205
 206     inline JSValue::JSValue(ExecState*, double d)
 207     {
 208         JSValue v = JSImmediate::from(d);
 209         ASSERT(v);
 210         *this = v;
 211     }
 212
 213     inline JSValue::JSValue(ExecState*, int i)
 214     {
 215         JSValue v = JSImmediate::from(i);
 216         ASSERT(v);
 217         *this = v;
 218     }
 219
 220     inline JSValue::JSValue(ExecState*, unsigned i)
 221     {
 222         JSValue v = JSImmediate::from(i);
 223         ASSERT(v);
 224         *this = v;
 225     }
 226
 227     inline JSValue::JSValue(ExecState*, long i)
 228     {
 229         JSValue v = JSImmediate::from(i);
 230         ASSERT(v);
 231         *this = v;
 232     }
 233
 234     inline JSValue::JSValue(ExecState*, unsigned long i)
 235     {
 236         JSValue v = JSImmediate::from(i);
 237         ASSERT(v);
 238         *this = v;
 239     }
 240
 241     inline JSValue::JSValue(ExecState*, long long i)
 242     {
 243         JSValue v = JSImmediate::from(static_cast<double>(i));
 244         ASSERT(v);
 245         *this = v;
 246     }
 247
 248     inline JSValue::JSValue(ExecState*, unsigned long long i)
 249     {
 250         JSValue v = JSImmediate::from(static_cast<double>(i));
 251         ASSERT(v);
 252         *this = v;
 253     }
 254
 255     inline JSValue::JSValue(JSGlobalData*, double d)
 256     {
 257         JSValue v = JSImmediate::from(d);
 258         ASSERT(v);
 259         *this = v;
 260     }
 261
 262     inline JSValue::JSValue(JSGlobalData*, int i)
 263     {
 264         JSValue v = JSImmediate::from(i);
 265         ASSERT(v);
 266         *this = v;
 267     }
 268
 269     inline JSValue::JSValue(JSGlobalData*, unsigned i)
 270     {
 271         JSValue v = JSImmediate::from(i);
 272         ASSERT(v);
 273         *this = v;
 274     }
 275
 276     inline bool JSValue::isDouble() const
 277     {
 278         return JSImmediate::isDouble(asValue());
 279     }
 280
 281     inline double JSValue::asDouble() const
 282     {
 283         return JSImmediate::doubleValue(asValue());
 284     }
 285
 286     inline bool JSValue::isNumber() const
 287     {
 288         return JSImmediate::isNumber(asValue());
 289     }
 290
 291     inline double JSValue::uncheckedGetNumber() const
 292     {
 293         ASSERT(isNumber());
 294         return JSImmediate::toDouble(asValue());
 295     }
 296
 297 #endif // USE(JSVALUE64)
 298
 299 #if USE(JSVALUE32) || USE(JSVALUE64)
 300
 301     inline JSValue::JSValue(ExecState*, char i)
 302     {
 303         ASSERT(JSImmediate::from(i));
 304         *this = JSImmediate::from(i);
 305     }
 306
 307     inline JSValue::JSValue(ExecState*, unsigned char i)
 308     {
 309         ASSERT(JSImmediate::from(i));
 310         *this = JSImmediate::from(i);
 311     }
 312
 313     inline JSValue::JSValue(ExecState*, short i)
 314     {
 315         ASSERT(JSImmediate::from(i));
 316         *this = JSImmediate::from(i);
 317     }
 318
 319     inline JSValue::JSValue(ExecState*, unsigned short i)
 320     {
 321         ASSERT(JSImmediate::from(i));
 322         *this = JSImmediate::from(i);
 323     }
 324
 325     inline JSValue jsNaN(ExecState* exec)
 326     {
 327         return jsNumber(exec, NaN);
 328     }
 329
 330     inline JSValue jsNaN(JSGlobalData* globalData)
 331     {
 332         return jsNumber(globalData, NaN);
 333     }
 334
 335     // --- JSValue inlines ----------------------------
 336
 337     ALWAYS_INLINE JSValue JSValue::toJSNumber(ExecState* exec) const
 338     {
 339         return isNumber() ? asValue() : jsNumber(exec, this->toNumber(exec));
 340     }
 341
 342     inline bool JSValue::getNumber(double &result) const
 343     {
 344         if (isInt32())
 345             result = asInt32();
 346         else if (LIKELY(isDouble()))
 347             result = asDouble();
 348         else {
 349             ASSERT(!isNumber());
 350             return false;
 351         }
 352         return true;
 353     }
 354
 355 #endif // USE(JSVALUE32) || USE(JSVALUE64)
 356
 357 } // namespace JSC
 358
 359 #endif // JSNumberCell_h