1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
|
/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
*
* 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 JSString_h
#define JSString_h
#include "CallFrame.h"
#include "CommonIdentifiers.h"
#include "Identifier.h"
#include "JSNumberCell.h"
#include "PropertyDescriptor.h"
#include "PropertySlot.h"
#include "RopeImpl.h"
namespace JSC {
class JSString;
JSString* jsEmptyString(JSGlobalData*);
JSString* jsEmptyString(ExecState*);
JSString* jsString(JSGlobalData*, const UString&); // returns empty string if passed null string
JSString* jsString(ExecState*, const UString&); // returns empty string if passed null string
JSString* jsSingleCharacterString(JSGlobalData*, UChar);
JSString* jsSingleCharacterString(ExecState*, UChar);
JSString* jsSingleCharacterSubstring(ExecState*, const UString&, unsigned offset);
JSString* jsSubstring(JSGlobalData*, const UString&, unsigned offset, unsigned length);
JSString* jsSubstring(ExecState*, const UString&, unsigned offset, unsigned length);
// Non-trivial strings are two or more characters long.
// These functions are faster than just calling jsString.
JSString* jsNontrivialString(JSGlobalData*, const UString&);
JSString* jsNontrivialString(ExecState*, const UString&);
JSString* jsNontrivialString(JSGlobalData*, const char*);
JSString* jsNontrivialString(ExecState*, const char*);
// Should be used for strings that are owned by an object that will
// likely outlive the JSValue this makes, such as the parse tree or a
// DOM object that contains a UString
JSString* jsOwnedString(JSGlobalData*, const UString&);
JSString* jsOwnedString(ExecState*, const UString&);
typedef void (*JSStringFinalizerCallback)(JSString*, void* context);
JSString* jsStringWithFinalizer(ExecState*, const UString&, JSStringFinalizerCallback callback, void* context);
class JS_EXPORTCLASS JSString : public JSCell {
public:
friend class JIT;
friend class JSGlobalData;
friend class SpecializedThunkJIT;
friend struct ThunkHelpers;
class RopeBuilder {
public:
RopeBuilder(unsigned fiberCount)
: m_index(0)
, m_rope(RopeImpl::tryCreateUninitialized(fiberCount))
{
}
bool isOutOfMemory() { return !m_rope; }
void append(RopeImpl::Fiber& fiber)
{
ASSERT(m_rope);
m_rope->initializeFiber(m_index, fiber);
}
void append(const UString& string)
{
ASSERT(m_rope);
m_rope->initializeFiber(m_index, string.rep());
}
void append(JSString* jsString)
{
if (jsString->isRope()) {
for (unsigned i = 0; i < jsString->m_fiberCount; ++i)
append(jsString->m_other.m_fibers[i]);
} else
append(jsString->string());
}
PassRefPtr<RopeImpl> release()
{
ASSERT(m_index == m_rope->fiberCount());
return m_rope.release();
}
unsigned length() { return m_rope->length(); }
private:
unsigned m_index;
RefPtr<RopeImpl> m_rope;
};
class RopeIterator {
public:
RopeIterator() { }
RopeIterator(RopeImpl::Fiber* fibers, size_t fiberCount)
{
ASSERT(fiberCount);
m_workQueue.append(WorkItem(fibers, fiberCount));
skipRopes();
}
RopeIterator& operator++()
{
WorkItem& item = m_workQueue.last();
ASSERT(!RopeImpl::isRope(item.fibers[item.i]));
if (++item.i == item.fiberCount)
m_workQueue.removeLast();
skipRopes();
return *this;
}
UStringImpl* operator*()
{
WorkItem& item = m_workQueue.last();
RopeImpl::Fiber fiber = item.fibers[item.i];
ASSERT(!RopeImpl::isRope(fiber));
return static_cast<UStringImpl*>(fiber);
}
bool operator!=(const RopeIterator& other) const
{
return m_workQueue != other.m_workQueue;
}
private:
struct WorkItem {
WorkItem(RopeImpl::Fiber* fibers, size_t fiberCount)
: fibers(fibers)
, fiberCount(fiberCount)
, i(0)
{
}
bool operator!=(const WorkItem& other) const
{
return fibers != other.fibers || fiberCount != other.fiberCount || i != other.i;
}
RopeImpl::Fiber* fibers;
size_t fiberCount;
size_t i;
};
void skipRopes()
{
if (m_workQueue.isEmpty())
return;
while (1) {
WorkItem& item = m_workQueue.last();
RopeImpl::Fiber fiber = item.fibers[item.i];
if (!RopeImpl::isRope(fiber))
break;
RopeImpl* rope = static_cast<RopeImpl*>(fiber);
if (++item.i == item.fiberCount)
m_workQueue.removeLast();
m_workQueue.append(WorkItem(rope->fibers(), rope->fiberCount()));
}
}
Vector<WorkItem, 16> m_workQueue;
};
ALWAYS_INLINE JSString(JSGlobalData* globalData, const UString& value)
: JSCell(globalData->stringStructure.get())
, m_length(value.size())
, m_value(value)
, m_fiberCount(0)
{
ASSERT(!m_value.isNull());
Heap::heap(this)->reportExtraMemoryCost(value.cost());
}
enum HasOtherOwnerType { HasOtherOwner };
JSString(JSGlobalData* globalData, const UString& value, HasOtherOwnerType)
: JSCell(globalData->stringStructure.get())
, m_length(value.size())
, m_value(value)
, m_fiberCount(0)
{
ASSERT(!m_value.isNull());
}
JSString(JSGlobalData* globalData, PassRefPtr<UStringImpl> value, HasOtherOwnerType)
: JSCell(globalData->stringStructure.get())
, m_length(value->length())
, m_value(value)
, m_fiberCount(0)
{
ASSERT(!m_value.isNull());
}
JSString(JSGlobalData* globalData, PassRefPtr<RopeImpl> rope)
: JSCell(globalData->stringStructure.get())
, m_length(rope->length())
, m_fiberCount(1)
{
m_other.m_fibers[0] = rope.releaseRef();
}
// This constructor constructs a new string by concatenating s1 & s2.
// This should only be called with fiberCount <= 3.
JSString(JSGlobalData* globalData, unsigned fiberCount, JSString* s1, JSString* s2)
: JSCell(globalData->stringStructure.get())
, m_length(s1->length() + s2->length())
, m_fiberCount(fiberCount)
{
ASSERT(fiberCount <= s_maxInternalRopeLength);
unsigned index = 0;
appendStringInConstruct(index, s1);
appendStringInConstruct(index, s2);
ASSERT(fiberCount == index);
}
// This constructor constructs a new string by concatenating s1 & s2.
// This should only be called with fiberCount <= 3.
JSString(JSGlobalData* globalData, unsigned fiberCount, JSString* s1, const UString& u2)
: JSCell(globalData->stringStructure.get())
, m_length(s1->length() + u2.size())
, m_fiberCount(fiberCount)
{
ASSERT(fiberCount <= s_maxInternalRopeLength);
unsigned index = 0;
appendStringInConstruct(index, s1);
appendStringInConstruct(index, u2);
ASSERT(fiberCount == index);
}
// This constructor constructs a new string by concatenating s1 & s2.
// This should only be called with fiberCount <= 3.
JSString(JSGlobalData* globalData, unsigned fiberCount, const UString& u1, JSString* s2)
: JSCell(globalData->stringStructure.get())
, m_length(u1.size() + s2->length())
, m_fiberCount(fiberCount)
{
ASSERT(fiberCount <= s_maxInternalRopeLength);
unsigned index = 0;
appendStringInConstruct(index, u1);
appendStringInConstruct(index, s2);
ASSERT(fiberCount == index);
}
// This constructor constructs a new string by concatenating v1, v2 & v3.
// This should only be called with fiberCount <= 3 ... which since every
// value must require a fiberCount of at least one implies that the length
// for each value must be exactly 1!
JSString(ExecState* exec, JSValue v1, JSValue v2, JSValue v3)
: JSCell(exec->globalData().stringStructure.get())
, m_length(0)
, m_fiberCount(s_maxInternalRopeLength)
{
unsigned index = 0;
appendValueInConstructAndIncrementLength(exec, index, v1);
appendValueInConstructAndIncrementLength(exec, index, v2);
appendValueInConstructAndIncrementLength(exec, index, v3);
ASSERT(index == s_maxInternalRopeLength);
}
// This constructor constructs a new string by concatenating u1 & u2.
JSString(JSGlobalData* globalData, const UString& u1, const UString& u2)
: JSCell(globalData->stringStructure.get())
, m_length(u1.size() + u2.size())
, m_fiberCount(2)
{
unsigned index = 0;
appendStringInConstruct(index, u1);
appendStringInConstruct(index, u2);
ASSERT(index <= s_maxInternalRopeLength);
}
// This constructor constructs a new string by concatenating u1, u2 & u3.
JSString(JSGlobalData* globalData, const UString& u1, const UString& u2, const UString& u3)
: JSCell(globalData->stringStructure.get())
, m_length(u1.size() + u2.size() + u3.size())
, m_fiberCount(s_maxInternalRopeLength)
{
unsigned index = 0;
appendStringInConstruct(index, u1);
appendStringInConstruct(index, u2);
appendStringInConstruct(index, u3);
ASSERT(index <= s_maxInternalRopeLength);
}
JSString(JSGlobalData* globalData, const UString& value, JSStringFinalizerCallback finalizer, void* context)
: JSCell(globalData->stringStructure.get())
, m_length(value.size())
, m_value(value)
, m_fiberCount(0)
{
ASSERT(!m_value.isNull());
// nasty hack because we can't union non-POD types
m_other.m_finalizerCallback = finalizer;
m_other.m_finalizerContext = context;
Heap::heap(this)->reportExtraMemoryCost(value.cost());
}
~JSString()
{
ASSERT(vptr() == JSGlobalData::jsStringVPtr);
for (unsigned i = 0; i < m_fiberCount; ++i)
RopeImpl::deref(m_other.m_fibers[i]);
if (!m_fiberCount && m_other.m_finalizerCallback)
m_other.m_finalizerCallback(this, m_other.m_finalizerContext);
}
const UString& value(ExecState* exec) const
{
if (isRope())
resolveRope(exec);
return m_value;
}
const UString& tryGetValue() const
{
if (isRope())
resolveRope(0);
return m_value;
}
unsigned length() { return m_length; }
bool getStringPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
bool getStringPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);
bool getStringPropertyDescriptor(ExecState*, const Identifier& propertyName, PropertyDescriptor&);
bool canGetIndex(unsigned i) { return i < m_length; }
JSString* getIndex(ExecState*, unsigned);
JSString* getIndexSlowCase(ExecState*, unsigned);
JSValue replaceCharacter(ExecState*, UChar, const UString& replacement);
static PassRefPtr<Structure> createStructure(JSValue proto) { return Structure::create(proto, TypeInfo(StringType, OverridesGetOwnPropertySlot | NeedsThisConversion), AnonymousSlotCount); }
private:
enum VPtrStealingHackType { VPtrStealingHack };
JSString(VPtrStealingHackType)
: JSCell(0)
, m_fiberCount(0)
{
}
void resolveRope(ExecState*) const;
void appendStringInConstruct(unsigned& index, const UString& string)
{
UStringImpl* impl = string.rep();
impl->ref();
m_other.m_fibers[index++] = impl;
}
void appendStringInConstruct(unsigned& index, JSString* jsString)
{
if (jsString->isRope()) {
for (unsigned i = 0; i < jsString->m_fiberCount; ++i) {
RopeImpl::Fiber fiber = jsString->m_other.m_fibers[i];
fiber->ref();
m_other.m_fibers[index++] = fiber;
}
} else
appendStringInConstruct(index, jsString->string());
}
void appendValueInConstructAndIncrementLength(ExecState* exec, unsigned& index, JSValue v)
{
if (v.isString()) {
ASSERT(asCell(v)->isString());
JSString* s = static_cast<JSString*>(asCell(v));
ASSERT(s->size() == 1);
appendStringInConstruct(index, s);
m_length += s->length();
} else {
UString u(v.toString(exec));
UStringImpl* impl = u.rep();
impl->ref();
m_other.m_fibers[index++] = impl;
m_length += u.size();
}
}
virtual JSValue toPrimitive(ExecState*, PreferredPrimitiveType) const;
virtual bool getPrimitiveNumber(ExecState*, double& number, JSValue& value);
virtual bool toBoolean(ExecState*) const;
virtual double toNumber(ExecState*) const;
virtual JSObject* toObject(ExecState*) const;
virtual UString toString(ExecState*) const;
virtual JSObject* toThisObject(ExecState*) const;
// Actually getPropertySlot, not getOwnPropertySlot (see JSCell).
virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);
virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&);
static const unsigned s_maxInternalRopeLength = 3;
// A string is represented either by a UString or a RopeImpl.
unsigned m_length;
mutable UString m_value;
mutable unsigned m_fiberCount;
// This structure exists to support a temporary workaround for a GC issue.
struct JSStringFinalizerStruct {
JSStringFinalizerStruct() : m_finalizerCallback(0) {}
union {
mutable FixedArray<RopeImpl::Fiber, s_maxInternalRopeLength> m_fibers;
struct {
JSStringFinalizerCallback m_finalizerCallback;
void* m_finalizerContext;
};
};
} m_other;
bool isRope() const { return m_fiberCount; }
UString& string() { ASSERT(!isRope()); return m_value; }
unsigned size() { return m_fiberCount ? m_fiberCount : 1; }
friend JSValue jsString(ExecState* exec, JSString* s1, JSString* s2);
friend JSValue jsString(ExecState* exec, const UString& u1, JSString* s2);
friend JSValue jsString(ExecState* exec, JSString* s1, const UString& u2);
friend JSValue jsString(ExecState* exec, Register* strings, unsigned count);
friend JSValue jsString(ExecState* exec, JSValue thisValue);
friend JSString* jsStringWithFinalizer(ExecState*, const UString&, JSStringFinalizerCallback callback, void* context);
};
JSString* asString(JSValue);
// When an object is created from a different DLL, MSVC changes vptr to a "local" one right after invoking a constructor,
// see <http://groups.google.com/group/microsoft.public.vc.language/msg/55cdcefeaf770212>.
// This breaks isJSString(), and we don't need that hack anyway, so we change vptr back to primary one.
// The below function must be called by any inline function that invokes a JSString constructor.
#if COMPILER(MSVC) && !defined(BUILDING_JavaScriptCore)
inline JSString* fixupVPtr(JSGlobalData* globalData, JSString* string) { string->setVPtr(globalData->jsStringVPtr); return string; }
#else
inline JSString* fixupVPtr(JSGlobalData*, JSString* string) { return string; }
#endif
inline JSString* asString(JSValue value)
{
ASSERT(asCell(value)->isString());
return static_cast<JSString*>(asCell(value));
}
inline JSString* jsEmptyString(JSGlobalData* globalData)
{
return globalData->smallStrings.emptyString(globalData);
}
inline JSString* jsSingleCharacterString(JSGlobalData* globalData, UChar c)
{
if (c <= 0xFF)
return globalData->smallStrings.singleCharacterString(globalData, c);
return fixupVPtr(globalData, new (globalData) JSString(globalData, UString(&c, 1)));
}
inline JSString* jsSingleCharacterSubstring(ExecState* exec, const UString& s, unsigned offset)
{
JSGlobalData* globalData = &exec->globalData();
ASSERT(offset < static_cast<unsigned>(s.size()));
UChar c = s.data()[offset];
if (c <= 0xFF)
return globalData->smallStrings.singleCharacterString(globalData, c);
return fixupVPtr(globalData, new (globalData) JSString(globalData, UString(UStringImpl::create(s.rep(), offset, 1))));
}
inline JSString* jsNontrivialString(JSGlobalData* globalData, const char* s)
{
ASSERT(s);
ASSERT(s[0]);
ASSERT(s[1]);
return fixupVPtr(globalData, new (globalData) JSString(globalData, s));
}
inline JSString* jsNontrivialString(JSGlobalData* globalData, const UString& s)
{
ASSERT(s.size() > 1);
return fixupVPtr(globalData, new (globalData) JSString(globalData, s));
}
inline JSString* JSString::getIndex(ExecState* exec, unsigned i)
{
ASSERT(canGetIndex(i));
if (isRope())
return getIndexSlowCase(exec, i);
ASSERT(i < m_value.size());
return jsSingleCharacterSubstring(exec, m_value, i);
}
inline JSString* jsString(JSGlobalData* globalData, const UString& s)
{
int size = s.size();
if (!size)
return globalData->smallStrings.emptyString(globalData);
if (size == 1) {
UChar c = s.data()[0];
if (c <= 0xFF)
return globalData->smallStrings.singleCharacterString(globalData, c);
}
return fixupVPtr(globalData, new (globalData) JSString(globalData, s));
}
inline JSString* jsStringWithFinalizer(ExecState* exec, const UString& s, JSStringFinalizerCallback callback, void* context)
{
ASSERT(s.size() && (s.size() > 1 || s.data()[0] > 0xFF));
JSGlobalData* globalData = &exec->globalData();
return fixupVPtr(globalData, new (globalData) JSString(globalData, s, callback, context));
}
inline JSString* jsSubstring(JSGlobalData* globalData, const UString& s, unsigned offset, unsigned length)
{
ASSERT(offset <= static_cast<unsigned>(s.size()));
ASSERT(length <= static_cast<unsigned>(s.size()));
ASSERT(offset + length <= static_cast<unsigned>(s.size()));
if (!length)
return globalData->smallStrings.emptyString(globalData);
if (length == 1) {
UChar c = s.data()[offset];
if (c <= 0xFF)
return globalData->smallStrings.singleCharacterString(globalData, c);
}
return fixupVPtr(globalData, new (globalData) JSString(globalData, UString(UStringImpl::create(s.rep(), offset, length)), JSString::HasOtherOwner));
}
inline JSString* jsOwnedString(JSGlobalData* globalData, const UString& s)
{
int size = s.size();
if (!size)
return globalData->smallStrings.emptyString(globalData);
if (size == 1) {
UChar c = s.data()[0];
if (c <= 0xFF)
return globalData->smallStrings.singleCharacterString(globalData, c);
}
return fixupVPtr(globalData, new (globalData) JSString(globalData, s, JSString::HasOtherOwner));
}
inline JSString* jsEmptyString(ExecState* exec) { return jsEmptyString(&exec->globalData()); }
inline JSString* jsString(ExecState* exec, const UString& s) { return jsString(&exec->globalData(), s); }
inline JSString* jsSingleCharacterString(ExecState* exec, UChar c) { return jsSingleCharacterString(&exec->globalData(), c); }
inline JSString* jsSubstring(ExecState* exec, const UString& s, unsigned offset, unsigned length) { return jsSubstring(&exec->globalData(), s, offset, length); }
inline JSString* jsNontrivialString(ExecState* exec, const UString& s) { return jsNontrivialString(&exec->globalData(), s); }
inline JSString* jsNontrivialString(ExecState* exec, const char* s) { return jsNontrivialString(&exec->globalData(), s); }
inline JSString* jsOwnedString(ExecState* exec, const UString& s) { return jsOwnedString(&exec->globalData(), s); }
ALWAYS_INLINE bool JSString::getStringPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
{
if (propertyName == exec->propertyNames().length) {
slot.setValue(jsNumber(exec, m_length));
return true;
}
bool isStrictUInt32;
unsigned i = propertyName.toStrictUInt32(&isStrictUInt32);
if (isStrictUInt32 && i < m_length) {
slot.setValue(getIndex(exec, i));
return true;
}
return false;
}
ALWAYS_INLINE bool JSString::getStringPropertySlot(ExecState* exec, unsigned propertyName, PropertySlot& slot)
{
if (propertyName < m_length) {
slot.setValue(getIndex(exec, propertyName));
return true;
}
return false;
}
inline bool isJSString(JSGlobalData* globalData, JSValue v) { return v.isCell() && v.asCell()->vptr() == globalData->jsStringVPtr; }
// --- JSValue inlines ----------------------------
inline UString JSValue::toString(ExecState* exec) const
{
if (isString())
return static_cast<JSString*>(asCell())->value(exec);
if (isInt32())
return exec->globalData().numericStrings.add(asInt32());
if (isDouble())
return exec->globalData().numericStrings.add(asDouble());
if (isTrue())
return "true";
if (isFalse())
return "false";
if (isNull())
return "null";
if (isUndefined())
return "undefined";
ASSERT(isCell());
return asCell()->toString(exec);
}
inline UString JSValue::toPrimitiveString(ExecState* exec) const
{
if (isString())
return static_cast<JSString*>(asCell())->value(exec);
if (isInt32())
return exec->globalData().numericStrings.add(asInt32());
if (isDouble())
return exec->globalData().numericStrings.add(asDouble());
if (isTrue())
return "true";
if (isFalse())
return "false";
if (isNull())
return "null";
if (isUndefined())
return "undefined";
ASSERT(isCell());
return asCell()->toPrimitive(exec, NoPreference).toString(exec);
}
} // namespace JSC
#endif // JSString_h
|