1 /* 2 * Copyright (C) 1999-2001 Harri Porten (porten (at) kde.org) 3 * Copyright (C) 2001 Peter Kelly (pmk (at) post.com) 4 * Copyright (C) 2003, 2004, 2005, 2006, 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 JSString_h 24 #define JSString_h 25 26 #include "CallFrame.h" 27 #include "CommonIdentifiers.h" 28 #include "Identifier.h" 29 #include "PropertyDescriptor.h" 30 #include "PropertySlot.h" 31 #include "RopeImpl.h" 32 #include "Structure.h" 33 34 namespace JSC { 35 36 class JSString; 37 38 JSString* jsEmptyString(JSGlobalData*); 39 JSString* jsEmptyString(ExecState*); 40 JSString* jsString(JSGlobalData*, const UString&); // returns empty string if passed null string 41 JSString* jsString(ExecState*, const UString&); // returns empty string if passed null string 42 43 JSString* jsSingleCharacterString(JSGlobalData*, UChar); 44 JSString* jsSingleCharacterString(ExecState*, UChar); 45 JSString* jsSingleCharacterSubstring(ExecState*, const UString&, unsigned offset); 46 JSString* jsSubstring(JSGlobalData*, const UString&, unsigned offset, unsigned length); 47 JSString* jsSubstring(ExecState*, const UString&, unsigned offset, unsigned length); 48 49 // Non-trivial strings are two or more characters long. 50 // These functions are faster than just calling jsString. 51 JSString* jsNontrivialString(JSGlobalData*, const UString&); 52 JSString* jsNontrivialString(ExecState*, const UString&); 53 JSString* jsNontrivialString(JSGlobalData*, const char*); 54 JSString* jsNontrivialString(ExecState*, const char*); 55 56 // Should be used for strings that are owned by an object that will 57 // likely outlive the JSValue this makes, such as the parse tree or a 58 // DOM object that contains a UString 59 JSString* jsOwnedString(JSGlobalData*, const UString&); 60 JSString* jsOwnedString(ExecState*, const UString&); 61 62 typedef void (*JSStringFinalizerCallback)(JSString*, void* context); 63 JSString* jsStringWithFinalizer(ExecState*, const UString&, JSStringFinalizerCallback callback, void* context); 64 65 class JS_EXPORTCLASS JSString : public JSCell { 66 public: 67 friend class JIT; 68 friend class JSGlobalData; 69 friend class SpecializedThunkJIT; 70 friend struct ThunkHelpers; 71 72 class RopeBuilder { 73 public: 74 RopeBuilder(unsigned fiberCount) 75 : m_index(0) 76 , m_rope(RopeImpl::tryCreateUninitialized(fiberCount)) 77 { 78 } 79 80 bool isOutOfMemory() { return !m_rope; } 81 82 void append(RopeImpl::Fiber& fiber) 83 { 84 ASSERT(m_rope); 85 m_rope->initializeFiber(m_index, fiber); 86 } 87 void append(const UString& string) 88 { 89 ASSERT(m_rope); 90 m_rope->initializeFiber(m_index, string.impl()); 91 } 92 void append(JSString* jsString) 93 { 94 if (jsString->isRope()) { 95 for (unsigned i = 0; i < jsString->m_fiberCount; ++i) 96 append(jsString->m_other.m_fibers[i]); 97 } else 98 append(jsString->string()); 99 } 100 101 PassRefPtr<RopeImpl> release() 102 { 103 ASSERT(m_index == m_rope->fiberCount()); 104 return m_rope.release(); 105 } 106 107 unsigned length() { return m_rope->length(); } 108 109 private: 110 unsigned m_index; 111 RefPtr<RopeImpl> m_rope; 112 }; 113 114 class RopeIterator { 115 public: 116 RopeIterator() { } 117 118 RopeIterator(RopeImpl::Fiber* fibers, size_t fiberCount) 119 { 120 ASSERT(fiberCount); 121 m_workQueue.append(WorkItem(fibers, fiberCount)); 122 skipRopes(); 123 } 124 125 RopeIterator& operator++() 126 { 127 WorkItem& item = m_workQueue.last(); 128 ASSERT(!RopeImpl::isRope(item.fibers[item.i])); 129 if (++item.i == item.fiberCount) 130 m_workQueue.removeLast(); 131 skipRopes(); 132 return *this; 133 } 134 135 StringImpl* operator*() 136 { 137 WorkItem& item = m_workQueue.last(); 138 RopeImpl::Fiber fiber = item.fibers[item.i]; 139 ASSERT(!RopeImpl::isRope(fiber)); 140 return static_cast<StringImpl*>(fiber); 141 } 142 143 bool operator!=(const RopeIterator& other) const 144 { 145 return m_workQueue != other.m_workQueue; 146 } 147 148 private: 149 struct WorkItem { 150 WorkItem(RopeImpl::Fiber* fibers, size_t fiberCount) 151 : fibers(fibers) 152 , fiberCount(fiberCount) 153 , i(0) 154 { 155 } 156 157 bool operator!=(const WorkItem& other) const 158 { 159 return fibers != other.fibers || fiberCount != other.fiberCount || i != other.i; 160 } 161 162 RopeImpl::Fiber* fibers; 163 size_t fiberCount; 164 size_t i; 165 }; 166 167 void skipRopes() 168 { 169 if (m_workQueue.isEmpty()) 170 return; 171 172 while (1) { 173 WorkItem& item = m_workQueue.last(); 174 RopeImpl::Fiber fiber = item.fibers[item.i]; 175 if (!RopeImpl::isRope(fiber)) 176 break; 177 RopeImpl* rope = static_cast<RopeImpl*>(fiber); 178 if (++item.i == item.fiberCount) 179 m_workQueue.removeLast(); 180 m_workQueue.append(WorkItem(rope->fibers(), rope->fiberCount())); 181 } 182 } 183 184 Vector<WorkItem, 16> m_workQueue; 185 }; 186 187 ALWAYS_INLINE JSString(JSGlobalData* globalData, const UString& value) 188 : JSCell(*globalData, globalData->stringStructure.get()) 189 , m_length(value.length()) 190 , m_value(value) 191 , m_fiberCount(0) 192 { 193 ASSERT(!m_value.isNull()); 194 Heap::heap(this)->reportExtraMemoryCost(value.impl()->cost()); 195 } 196 197 enum HasOtherOwnerType { HasOtherOwner }; 198 JSString(JSGlobalData* globalData, const UString& value, HasOtherOwnerType) 199 : JSCell(*globalData, globalData->stringStructure.get()) 200 , m_length(value.length()) 201 , m_value(value) 202 , m_fiberCount(0) 203 { 204 ASSERT(!m_value.isNull()); 205 } 206 JSString(JSGlobalData* globalData, PassRefPtr<StringImpl> value, HasOtherOwnerType) 207 : JSCell(*globalData, globalData->stringStructure.get()) 208 , m_length(value->length()) 209 , m_value(value) 210 , m_fiberCount(0) 211 { 212 ASSERT(!m_value.isNull()); 213 } 214 JSString(JSGlobalData* globalData, PassRefPtr<RopeImpl> rope) 215 : JSCell(*globalData, globalData->stringStructure.get()) 216 , m_length(rope->length()) 217 , m_fiberCount(1) 218 { 219 m_other.m_fibers[0] = rope.leakRef(); 220 } 221 // This constructor constructs a new string by concatenating s1 & s2. 222 // This should only be called with fiberCount <= 3. 223 JSString(JSGlobalData* globalData, unsigned fiberCount, JSString* s1, JSString* s2) 224 : JSCell(*globalData, globalData->stringStructure.get()) 225 , m_length(s1->length() + s2->length()) 226 , m_fiberCount(fiberCount) 227 { 228 ASSERT(fiberCount <= s_maxInternalRopeLength); 229 unsigned index = 0; 230 appendStringInConstruct(index, s1); 231 appendStringInConstruct(index, s2); 232 ASSERT(fiberCount == index); 233 } 234 // This constructor constructs a new string by concatenating s1 & s2. 235 // This should only be called with fiberCount <= 3. 236 JSString(JSGlobalData* globalData, unsigned fiberCount, JSString* s1, const UString& u2) 237 : JSCell(*globalData, globalData->stringStructure.get()) 238 , m_length(s1->length() + u2.length()) 239 , m_fiberCount(fiberCount) 240 { 241 ASSERT(fiberCount <= s_maxInternalRopeLength); 242 unsigned index = 0; 243 appendStringInConstruct(index, s1); 244 appendStringInConstruct(index, u2); 245 ASSERT(fiberCount == index); 246 } 247 // This constructor constructs a new string by concatenating s1 & s2. 248 // This should only be called with fiberCount <= 3. 249 JSString(JSGlobalData* globalData, unsigned fiberCount, const UString& u1, JSString* s2) 250 : JSCell(*globalData, globalData->stringStructure.get()) 251 , m_length(u1.length() + s2->length()) 252 , m_fiberCount(fiberCount) 253 { 254 ASSERT(fiberCount <= s_maxInternalRopeLength); 255 unsigned index = 0; 256 appendStringInConstruct(index, u1); 257 appendStringInConstruct(index, s2); 258 ASSERT(fiberCount == index); 259 } 260 // This constructor constructs a new string by concatenating v1, v2 & v3. 261 // This should only be called with fiberCount <= 3 ... which since every 262 // value must require a fiberCount of at least one implies that the length 263 // for each value must be exactly 1! 264 JSString(ExecState* exec, JSValue v1, JSValue v2, JSValue v3) 265 : JSCell(exec->globalData(), exec->globalData().stringStructure.get()) 266 , m_length(0) 267 , m_fiberCount(s_maxInternalRopeLength) 268 { 269 unsigned index = 0; 270 appendValueInConstructAndIncrementLength(exec, index, v1); 271 appendValueInConstructAndIncrementLength(exec, index, v2); 272 appendValueInConstructAndIncrementLength(exec, index, v3); 273 ASSERT(index == s_maxInternalRopeLength); 274 } 275 276 // This constructor constructs a new string by concatenating u1 & u2. 277 JSString(JSGlobalData* globalData, const UString& u1, const UString& u2) 278 : JSCell(*globalData, globalData->stringStructure.get()) 279 , m_length(u1.length() + u2.length()) 280 , m_fiberCount(2) 281 { 282 unsigned index = 0; 283 appendStringInConstruct(index, u1); 284 appendStringInConstruct(index, u2); 285 ASSERT(index <= s_maxInternalRopeLength); 286 } 287 288 // This constructor constructs a new string by concatenating u1, u2 & u3. 289 JSString(JSGlobalData* globalData, const UString& u1, const UString& u2, const UString& u3) 290 : JSCell(*globalData, globalData->stringStructure.get()) 291 , m_length(u1.length() + u2.length() + u3.length()) 292 , m_fiberCount(s_maxInternalRopeLength) 293 { 294 unsigned index = 0; 295 appendStringInConstruct(index, u1); 296 appendStringInConstruct(index, u2); 297 appendStringInConstruct(index, u3); 298 ASSERT(index <= s_maxInternalRopeLength); 299 } 300 301 JSString(JSGlobalData* globalData, const UString& value, JSStringFinalizerCallback finalizer, void* context) 302 : JSCell(*globalData, globalData->stringStructure.get()) 303 , m_length(value.length()) 304 , m_value(value) 305 , m_fiberCount(0) 306 { 307 ASSERT(!m_value.isNull()); 308 // nasty hack because we can't union non-POD types 309 m_other.m_finalizerCallback = finalizer; 310 m_other.m_finalizerContext = context; 311 Heap::heap(this)->reportExtraMemoryCost(value.impl()->cost()); 312 } 313 314 ~JSString() 315 { 316 ASSERT(vptr() == JSGlobalData::jsStringVPtr); 317 if (!m_fiberCount) { 318 if (m_other.m_finalizerCallback) 319 m_other.m_finalizerCallback(this, m_other.m_finalizerContext); 320 } else { 321 unsigned i = 0; 322 do 323 RopeImpl::deref(m_other.m_fibers[i]); 324 while (++i < m_fiberCount); 325 } 326 } 327 328 const UString& value(ExecState* exec) const 329 { 330 if (isRope()) 331 resolveRope(exec); 332 return m_value; 333 } 334 const UString& tryGetValue() const 335 { 336 if (isRope()) 337 resolveRope(0); 338 return m_value; 339 } 340 unsigned length() { return m_length; } 341 342 bool getStringPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&); 343 bool getStringPropertySlot(ExecState*, unsigned propertyName, PropertySlot&); 344 bool getStringPropertyDescriptor(ExecState*, const Identifier& propertyName, PropertyDescriptor&); 345 346 bool canGetIndex(unsigned i) { return i < m_length; } 347 JSString* getIndex(ExecState*, unsigned); 348 JSString* getIndexSlowCase(ExecState*, unsigned); 349 350 JSValue replaceCharacter(ExecState*, UChar, const UString& replacement); 351 352 static Structure* createStructure(JSGlobalData& globalData, JSValue proto) { return Structure::create(globalData, proto, TypeInfo(StringType, OverridesGetOwnPropertySlot | NeedsThisConversion), AnonymousSlotCount, 0); } 353 354 private: 355 JSString(VPtrStealingHackType) 356 : JSCell(VPtrStealingHack) 357 , m_fiberCount(0) 358 { 359 } 360 361 void resolveRope(ExecState*) const; 362 JSString* substringFromRope(ExecState*, unsigned offset, unsigned length); 363 364 void appendStringInConstruct(unsigned& index, const UString& string) 365 { 366 StringImpl* impl = string.impl(); 367 impl->ref(); 368 m_other.m_fibers[index++] = impl; 369 } 370 371 void appendStringInConstruct(unsigned& index, JSString* jsString) 372 { 373 if (jsString->isRope()) { 374 for (unsigned i = 0; i < jsString->m_fiberCount; ++i) { 375 RopeImpl::Fiber fiber = jsString->m_other.m_fibers[i]; 376 fiber->ref(); 377 m_other.m_fibers[index++] = fiber; 378 } 379 } else 380 appendStringInConstruct(index, jsString->string()); 381 } 382 383 void appendValueInConstructAndIncrementLength(ExecState* exec, unsigned& index, JSValue v) 384 { 385 if (v.isString()) { 386 ASSERT(v.asCell()->isString()); 387 JSString* s = static_cast<JSString*>(v.asCell()); 388 ASSERT(s->fiberCount() == 1); 389 appendStringInConstruct(index, s); 390 m_length += s->length(); 391 } else { 392 UString u(v.toString(exec)); 393 StringImpl* impl = u.impl(); 394 impl->ref(); 395 m_other.m_fibers[index++] = impl; 396 m_length += u.length(); 397 } 398 } 399 400 virtual JSValue toPrimitive(ExecState*, PreferredPrimitiveType) const; 401 virtual bool getPrimitiveNumber(ExecState*, double& number, JSValue& value); 402 virtual bool toBoolean(ExecState*) const; 403 virtual double toNumber(ExecState*) const; 404 virtual JSObject* toObject(ExecState*, JSGlobalObject*) const; 405 virtual UString toString(ExecState*) const; 406 407 virtual JSObject* toThisObject(ExecState*) const; 408 409 // Actually getPropertySlot, not getOwnPropertySlot (see JSCell). 410 virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&); 411 virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&); 412 virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&); 413 414 static const unsigned s_maxInternalRopeLength = 3; 415 416 // A string is represented either by a UString or a RopeImpl. 417 unsigned m_length; 418 mutable UString m_value; 419 mutable unsigned m_fiberCount; 420 // This structure exists to support a temporary workaround for a GC issue. 421 struct JSStringFinalizerStruct { 422 JSStringFinalizerStruct() : m_finalizerCallback(0) {} 423 union { 424 mutable FixedArray<RopeImpl::Fiber, s_maxInternalRopeLength> m_fibers; 425 struct { 426 JSStringFinalizerCallback m_finalizerCallback; 427 void* m_finalizerContext; 428 }; 429 }; 430 } m_other; 431 432 bool isRope() const { return m_fiberCount; } 433 UString& string() { ASSERT(!isRope()); return m_value; } 434 unsigned fiberCount() { return m_fiberCount ? m_fiberCount : 1; } 435 436 friend JSValue jsString(ExecState* exec, JSString* s1, JSString* s2); 437 friend JSValue jsString(ExecState* exec, const UString& u1, JSString* s2); 438 friend JSValue jsString(ExecState* exec, JSString* s1, const UString& u2); 439 friend JSValue jsString(ExecState* exec, Register* strings, unsigned count); 440 friend JSValue jsString(ExecState* exec, JSValue thisValue); 441 friend JSString* jsStringWithFinalizer(ExecState*, const UString&, JSStringFinalizerCallback callback, void* context); 442 friend JSString* jsSubstring(ExecState* exec, JSString* s, unsigned offset, unsigned length); 443 }; 444 445 JSString* asString(JSValue); 446 447 // When an object is created from a different DLL, MSVC changes vptr to a "local" one right after invoking a constructor, 448 // see <http://groups.google.com/group/microsoft.public.vc.language/msg/55cdcefeaf770212>. 449 // This breaks isJSString(), and we don't need that hack anyway, so we change vptr back to primary one. 450 // The below function must be called by any inline function that invokes a JSString constructor. 451 #if COMPILER(MSVC) && !defined(BUILDING_JavaScriptCore) 452 inline JSString* fixupVPtr(JSGlobalData* globalData, JSString* string) { string->setVPtr(globalData->jsStringVPtr); return string; } 453 #else 454 inline JSString* fixupVPtr(JSGlobalData*, JSString* string) { return string; } 455 #endif 456 457 inline JSString* asString(JSValue value) 458 { 459 ASSERT(value.asCell()->isString()); 460 return static_cast<JSString*>(value.asCell()); 461 } 462 463 inline JSString* jsEmptyString(JSGlobalData* globalData) 464 { 465 return globalData->smallStrings.emptyString(globalData); 466 } 467 468 inline JSString* jsSingleCharacterString(JSGlobalData* globalData, UChar c) 469 { 470 if (c <= maxSingleCharacterString) 471 return globalData->smallStrings.singleCharacterString(globalData, c); 472 return fixupVPtr(globalData, new (globalData) JSString(globalData, UString(&c, 1))); 473 } 474 475 inline JSString* jsSingleCharacterSubstring(ExecState* exec, const UString& s, unsigned offset) 476 { 477 JSGlobalData* globalData = &exec->globalData(); 478 ASSERT(offset < static_cast<unsigned>(s.length())); 479 UChar c = s.characters()[offset]; 480 if (c <= maxSingleCharacterString) 481 return globalData->smallStrings.singleCharacterString(globalData, c); 482 return fixupVPtr(globalData, new (globalData) JSString(globalData, UString(StringImpl::create(s.impl(), offset, 1)))); 483 } 484 485 inline JSString* jsNontrivialString(JSGlobalData* globalData, const char* s) 486 { 487 ASSERT(s); 488 ASSERT(s[0]); 489 ASSERT(s[1]); 490 return fixupVPtr(globalData, new (globalData) JSString(globalData, s)); 491 } 492 493 inline JSString* jsNontrivialString(JSGlobalData* globalData, const UString& s) 494 { 495 ASSERT(s.length() > 1); 496 return fixupVPtr(globalData, new (globalData) JSString(globalData, s)); 497 } 498 499 inline JSString* JSString::getIndex(ExecState* exec, unsigned i) 500 { 501 ASSERT(canGetIndex(i)); 502 if (isRope()) 503 return getIndexSlowCase(exec, i); 504 ASSERT(i < m_value.length()); 505 return jsSingleCharacterSubstring(exec, m_value, i); 506 } 507 508 inline JSString* jsString(JSGlobalData* globalData, const UString& s) 509 { 510 int size = s.length(); 511 if (!size) 512 return globalData->smallStrings.emptyString(globalData); 513 if (size == 1) { 514 UChar c = s.characters()[0]; 515 if (c <= maxSingleCharacterString) 516 return globalData->smallStrings.singleCharacterString(globalData, c); 517 } 518 return fixupVPtr(globalData, new (globalData) JSString(globalData, s)); 519 } 520 521 inline JSString* jsStringWithFinalizer(ExecState* exec, const UString& s, JSStringFinalizerCallback callback, void* context) 522 { 523 ASSERT(s.length() && (s.length() > 1 || s.characters()[0] > maxSingleCharacterString)); 524 JSGlobalData* globalData = &exec->globalData(); 525 return fixupVPtr(globalData, new (globalData) JSString(globalData, s, callback, context)); 526 } 527 528 inline JSString* jsSubstring(ExecState* exec, JSString* s, unsigned offset, unsigned length) 529 { 530 ASSERT(offset <= static_cast<unsigned>(s->length())); 531 ASSERT(length <= static_cast<unsigned>(s->length())); 532 ASSERT(offset + length <= static_cast<unsigned>(s->length())); 533 JSGlobalData* globalData = &exec->globalData(); 534 if (!length) 535 return globalData->smallStrings.emptyString(globalData); 536 if (s->isRope()) 537 return s->substringFromRope(exec, offset, length); 538 return jsSubstring(globalData, s->m_value, offset, length); 539 } 540 541 inline JSString* jsSubstring(JSGlobalData* globalData, const UString& s, unsigned offset, unsigned length) 542 { 543 ASSERT(offset <= static_cast<unsigned>(s.length())); 544 ASSERT(length <= static_cast<unsigned>(s.length())); 545 ASSERT(offset + length <= static_cast<unsigned>(s.length())); 546 if (!length) 547 return globalData->smallStrings.emptyString(globalData); 548 if (length == 1) { 549 UChar c = s.characters()[offset]; 550 if (c <= maxSingleCharacterString) 551 return globalData->smallStrings.singleCharacterString(globalData, c); 552 } 553 return fixupVPtr(globalData, new (globalData) JSString(globalData, UString(StringImpl::create(s.impl(), offset, length)), JSString::HasOtherOwner)); 554 } 555 556 inline JSString* jsOwnedString(JSGlobalData* globalData, const UString& s) 557 { 558 int size = s.length(); 559 if (!size) 560 return globalData->smallStrings.emptyString(globalData); 561 if (size == 1) { 562 UChar c = s.characters()[0]; 563 if (c <= maxSingleCharacterString) 564 return globalData->smallStrings.singleCharacterString(globalData, c); 565 } 566 return fixupVPtr(globalData, new (globalData) JSString(globalData, s, JSString::HasOtherOwner)); 567 } 568 569 inline JSString* jsEmptyString(ExecState* exec) { return jsEmptyString(&exec->globalData()); } 570 inline JSString* jsString(ExecState* exec, const UString& s) { return jsString(&exec->globalData(), s); } 571 inline JSString* jsSingleCharacterString(ExecState* exec, UChar c) { return jsSingleCharacterString(&exec->globalData(), c); } 572 inline JSString* jsSubstring(ExecState* exec, const UString& s, unsigned offset, unsigned length) { return jsSubstring(&exec->globalData(), s, offset, length); } 573 inline JSString* jsNontrivialString(ExecState* exec, const UString& s) { return jsNontrivialString(&exec->globalData(), s); } 574 inline JSString* jsNontrivialString(ExecState* exec, const char* s) { return jsNontrivialString(&exec->globalData(), s); } 575 inline JSString* jsOwnedString(ExecState* exec, const UString& s) { return jsOwnedString(&exec->globalData(), s); } 576 577 ALWAYS_INLINE bool JSString::getStringPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot) 578 { 579 if (propertyName == exec->propertyNames().length) { 580 slot.setValue(jsNumber(m_length)); 581 return true; 582 } 583 584 bool isStrictUInt32; 585 unsigned i = propertyName.toUInt32(isStrictUInt32); 586 if (isStrictUInt32 && i < m_length) { 587 slot.setValue(getIndex(exec, i)); 588 return true; 589 } 590 591 return false; 592 } 593 594 ALWAYS_INLINE bool JSString::getStringPropertySlot(ExecState* exec, unsigned propertyName, PropertySlot& slot) 595 { 596 if (propertyName < m_length) { 597 slot.setValue(getIndex(exec, propertyName)); 598 return true; 599 } 600 601 return false; 602 } 603 604 inline bool isJSString(JSGlobalData* globalData, JSValue v) { return v.isCell() && v.asCell()->vptr() == globalData->jsStringVPtr; } 605 606 // --- JSValue inlines ---------------------------- 607 608 inline UString JSValue::toString(ExecState* exec) const 609 { 610 if (isString()) 611 return static_cast<JSString*>(asCell())->value(exec); 612 if (isInt32()) 613 return exec->globalData().numericStrings.add(asInt32()); 614 if (isDouble()) 615 return exec->globalData().numericStrings.add(asDouble()); 616 if (isTrue()) 617 return "true"; 618 if (isFalse()) 619 return "false"; 620 if (isNull()) 621 return "null"; 622 if (isUndefined()) 623 return "undefined"; 624 ASSERT(isCell()); 625 return asCell()->toString(exec); 626 } 627 628 inline UString JSValue::toPrimitiveString(ExecState* exec) const 629 { 630 ASSERT(!isString()); 631 if (isInt32()) 632 return exec->globalData().numericStrings.add(asInt32()); 633 if (isDouble()) 634 return exec->globalData().numericStrings.add(asDouble()); 635 if (isTrue()) 636 return "true"; 637 if (isFalse()) 638 return "false"; 639 if (isNull()) 640 return "null"; 641 if (isUndefined()) 642 return "undefined"; 643 ASSERT(isCell()); 644 return asCell()->toPrimitive(exec, NoPreference).toString(exec); 645 } 646 647 } // namespace JSC 648 649 #endif // JSString_h 650
