kjs/JSGlobalObject.cpp

   1 /*
   2  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
   3  * Copyright (C) 2008 Cameron Zwarich (cwzwarich@uwaterloo.ca)
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1.  Redistributions of source code must retain the above copyright
  10  *     notice, this list of conditions and the following disclaimer.
  11  * 2.  Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  15  *     its contributors may be used to endorse or promote products derived
  16  *     from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include "config.h"
  31 #include "JSGlobalObject.h"
  32
  33 #include "Activation.h"
  34 #include "array_object.h"
  35 #include "bool_object.h"
  36 #include "date_object.h"
  37 #include "debugger.h"
  38 #include "error_object.h"
  39 #include "function_object.h"
  40 #include "math_object.h"
  41 #include "number_object.h"
  42 #include "object_object.h"
  43 #include "regexp_object.h"
  44 #include "SavedBuiltins.h"
  45 #include "string_object.h"
  46
  47 #if HAVE(SYS_TIME_H)
  48 #include <sys/time.h>
  49 #endif
  50
  51 #if PLATFORM(WIN_OS)
  52 #include <windows.h>
  53 #endif
  54
  55 #if PLATFORM(QT)
  56 #include <QDateTime>
  57 #endif
  58
  59 namespace KJS {
  60
  61 // Default number of ticks before a timeout check should be done.
  62 static const int initialTickCountThreshold = 255;
  63
  64 // Preferred number of milliseconds between each timeout check
  65 static const int preferredScriptCheckTimeInterval = 1000;
  66
  67 static inline void markIfNeeded(JSValue* v)
  68 {
  69     if (v && !v->marked())
  70         v->mark();
  71 }
  72
  73 // Returns the current time in milliseconds
  74 // It doesn't matter what "current time" is here, just as long as
  75 // it's possible to measure the time difference correctly.
  76 static inline unsigned getCurrentTime()
  77 {
  78 #if HAVE(SYS_TIME_H)
  79     struct timeval tv;
  80     gettimeofday(&tv, 0);
  81     return tv.tv_sec * 1000 + tv.tv_usec / 1000;
  82 #elif PLATFORM(QT)
  83     QDateTime t = QDateTime::currentDateTime();
  84     return t.toTime_t() * 1000 + t.time().msec();
  85 #elif PLATFORM(WIN_OS)
  86     return timeGetTime();
  87 #else
  88 #error Platform does not have getCurrentTime function
  89 #endif
  90 }
  91
  92 JSGlobalObject* JSGlobalObject::s_head = 0;
  93
  94 void JSGlobalObject::deleteActivationStack()
  95 {
  96     ActivationStackNode* prevNode = 0;
  97     for (ActivationStackNode* currentNode = d()->activations; currentNode; currentNode = prevNode) {
  98         prevNode = currentNode->prev;
  99         delete currentNode;
 100     }
 101 }
 102
 103 JSGlobalObject::~JSGlobalObject()
 104 {
 105     ASSERT(JSLock::currentThreadIsHoldingLock());
 106
 107     if (d()->debugger)
 108         d()->debugger->detach(this);
 109
 110     d()->next->d()->prev = d()->prev;
 111     d()->prev->d()->next = d()->next;
 112     s_head = d()->next;
 113     if (s_head == this)
 114         s_head = 0;
 115
 116     deleteActivationStack();
 117
 118     delete d();
 119 }
 120
 121 void JSGlobalObject::init()
 122 {
 123     ASSERT(JSLock::currentThreadIsHoldingLock());
 124
 125     if (s_head) {
 126         d()->prev = s_head;
 127         d()->next = s_head->d()->next;
 128         s_head->d()->next->d()->prev = this;
 129         s_head->d()->next = this;
 130     } else
 131         s_head = d()->next = d()->prev = this;
 132
 133     d()->compatMode = NativeMode;
 134
 135     resetTimeoutCheck();
 136     d()->timeoutTime = 0;
 137     d()->timeoutCheckCount = 0;
 138
 139     d()->recursion = 0;
 140     d()->debugger = 0;
 141
 142     ActivationStackNode* newStackNode = new ActivationStackNode;
 143     newStackNode->prev = 0;
 144     d()->activations = newStackNode;
 145     d()->activationCount = 0;
 146
 147     reset(prototype());
 148 }
 149
 150 bool JSGlobalObject::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
 151 {
 152     if (symbolTableGet(propertyName, slot))
 153         return true;
 154     return JSVariableObject::getOwnPropertySlot(exec, propertyName, slot);
 155 }
 156
 157 void JSGlobalObject::put(ExecState* exec, const Identifier& propertyName, JSValue* value, int attr)
 158 {
 159     if (symbolTablePut(propertyName, value, !(attr & ~DontDelete)))
 160         return;
 161     return JSVariableObject::put(exec, propertyName, value, attr);
 162 }
 163
 164 static inline JSObject* lastInPrototypeChain(JSObject* object)
 165 {
 166     JSObject* o = object;
 167     while (o->prototype()->isObject())
 168         o = static_cast<JSObject*>(o->prototype());
 169     return o;
 170 }
 171
 172 void JSGlobalObject::reset(JSValue* prototype)
 173 {
 174     // Clear before inititalizing, to avoid calling mark() on stale pointers --
 175     // which would be wasteful -- or uninitialized pointers -- which would be
 176     // dangerous. (The allocations below may cause a GC.)
 177
 178     _prop.clear();
 179     localStorage().clear();
 180     symbolTable().clear();
 181
 182     // Prototypes
 183     d()->functionPrototype = 0;
 184     d()->objectPrototype = 0;
 185
 186     d()->arrayPrototype = 0;
 187     d()->stringPrototype = 0;
 188     d()->booleanPrototype = 0;
 189     d()->numberPrototype = 0;
 190     d()->datePrototype = 0;
 191     d()->regExpPrototype = 0;
 192     d()->errorPrototype = 0;
 193
 194     d()->evalErrorPrototype = 0;
 195     d()->rangeErrorPrototype = 0;
 196     d()->referenceErrorPrototype = 0;
 197     d()->syntaxErrorPrototype = 0;
 198     d()->typeErrorPrototype = 0;
 199     d()->URIErrorPrototype = 0;
 200
 201     // Constructors
 202     d()->objectConstructor = 0;
 203     d()->functionConstructor = 0;
 204     d()->arrayConstructor = 0;
 205     d()->stringConstructor = 0;
 206     d()->booleanConstructor = 0;
 207     d()->numberConstructor = 0;
 208     d()->dateConstructor = 0;
 209     d()->regExpConstructor = 0;
 210     d()->errorConstructor = 0;
 211
 212     d()->evalErrorConstructor = 0;
 213     d()->rangeErrorConstructor = 0;
 214     d()->referenceErrorConstructor = 0;
 215     d()->syntaxErrorConstructor = 0;
 216     d()->typeErrorConstructor = 0;
 217     d()->URIErrorConstructor = 0;
 218
 219     ExecState* exec = &d()->globalExec;
 220
 221     // Prototypes
 222     d()->functionPrototype = new FunctionPrototype(exec);
 223     d()->objectPrototype = new ObjectPrototype(exec, d()->functionPrototype);
 224     d()->functionPrototype->setPrototype(d()->objectPrototype);
 225
 226     d()->arrayPrototype = new ArrayPrototype(exec, d()->objectPrototype);
 227     d()->stringPrototype = new StringPrototype(exec, d()->objectPrototype);
 228     d()->booleanPrototype = new BooleanPrototype(exec, d()->objectPrototype, d()->functionPrototype);
 229     d()->numberPrototype = new NumberPrototype(exec, d()->objectPrototype, d()->functionPrototype);
 230     d()->datePrototype = new DatePrototype(exec, d()->objectPrototype);
 231     d()->regExpPrototype = new RegExpPrototype(exec, d()->objectPrototype, d()->functionPrototype);
 232     d()->errorPrototype = new ErrorPrototype(exec, d()->objectPrototype, d()->functionPrototype);
 233
 234     d()->evalErrorPrototype = new NativeErrorPrototype(exec, d()->errorPrototype, "EvalError", "EvalError");
 235     d()->rangeErrorPrototype = new NativeErrorPrototype(exec, d()->errorPrototype, "RangeError", "RangeError");
 236     d()->referenceErrorPrototype = new NativeErrorPrototype(exec, d()->errorPrototype, "ReferenceError", "ReferenceError");
 237     d()->syntaxErrorPrototype = new NativeErrorPrototype(exec, d()->errorPrototype, "SyntaxError", "SyntaxError");
 238     d()->typeErrorPrototype = new NativeErrorPrototype(exec, d()->errorPrototype, "TypeError", "TypeError");
 239     d()->URIErrorPrototype = new NativeErrorPrototype(exec, d()->errorPrototype, "URIError", "URIError");
 240
 241     // Constructors
 242     d()->objectConstructor = new ObjectObjectImp(exec, d()->objectPrototype, d()->functionPrototype);
 243     d()->functionConstructor = new FunctionObjectImp(exec, d()->functionPrototype);
 244     d()->arrayConstructor = new ArrayObjectImp(exec, d()->functionPrototype, d()->arrayPrototype);
 245     d()->stringConstructor = new StringObjectImp(exec, d()->functionPrototype, d()->stringPrototype);
 246     d()->booleanConstructor = new BooleanObjectImp(exec, d()->functionPrototype, d()->booleanPrototype);
 247     d()->numberConstructor = new NumberObjectImp(exec, d()->functionPrototype, d()->numberPrototype);
 248     d()->dateConstructor = new DateObjectImp(exec, d()->functionPrototype, d()->datePrototype);
 249     d()->regExpConstructor = new RegExpObjectImp(exec, d()->functionPrototype, d()->regExpPrototype);
 250     d()->errorConstructor = new ErrorObjectImp(exec, d()->functionPrototype, d()->errorPrototype);
 251
 252     d()->evalErrorConstructor = new NativeErrorImp(exec, d()->functionPrototype, d()->evalErrorPrototype);
 253     d()->rangeErrorConstructor = new NativeErrorImp(exec, d()->functionPrototype, d()->rangeErrorPrototype);
 254     d()->referenceErrorConstructor = new NativeErrorImp(exec, d()->functionPrototype, d()->referenceErrorPrototype);
 255     d()->syntaxErrorConstructor = new NativeErrorImp(exec, d()->functionPrototype, d()->syntaxErrorPrototype);
 256     d()->typeErrorConstructor = new NativeErrorImp(exec, d()->functionPrototype, d()->typeErrorPrototype);
 257     d()->URIErrorConstructor = new NativeErrorImp(exec, d()->functionPrototype, d()->URIErrorPrototype);
 258
 259     d()->functionPrototype->putDirect(exec->propertyNames().constructor, d()->functionConstructor, DontEnum);
 260
 261     d()->objectPrototype->putDirect(exec->propertyNames().constructor, d()->objectConstructor, DontEnum | DontDelete | ReadOnly);
 262     d()->functionPrototype->putDirect(exec->propertyNames().constructor, d()->functionConstructor, DontEnum | DontDelete | ReadOnly);
 263     d()->arrayPrototype->putDirect(exec->propertyNames().constructor, d()->arrayConstructor, DontEnum | DontDelete | ReadOnly);
 264     d()->booleanPrototype->putDirect(exec->propertyNames().constructor, d()->booleanConstructor, DontEnum | DontDelete | ReadOnly);
 265     d()->stringPrototype->putDirect(exec->propertyNames().constructor, d()->stringConstructor, DontEnum | DontDelete | ReadOnly);
 266     d()->numberPrototype->putDirect(exec->propertyNames().constructor, d()->numberConstructor, DontEnum | DontDelete | ReadOnly);
 267     d()->datePrototype->putDirect(exec->propertyNames().constructor, d()->dateConstructor, DontEnum | DontDelete | ReadOnly);
 268     d()->regExpPrototype->putDirect(exec->propertyNames().constructor, d()->regExpConstructor, DontEnum | DontDelete | ReadOnly);
 269     d()->errorPrototype->putDirect(exec->propertyNames().constructor, d()->errorConstructor, DontEnum | DontDelete | ReadOnly);
 270     d()->evalErrorPrototype->putDirect(exec->propertyNames().constructor, d()->evalErrorConstructor, DontEnum | DontDelete | ReadOnly);
 271     d()->rangeErrorPrototype->putDirect(exec->propertyNames().constructor, d()->rangeErrorConstructor, DontEnum | DontDelete | ReadOnly);
 272     d()->referenceErrorPrototype->putDirect(exec->propertyNames().constructor, d()->referenceErrorConstructor, DontEnum | DontDelete | ReadOnly);
 273     d()->syntaxErrorPrototype->putDirect(exec->propertyNames().constructor, d()->syntaxErrorConstructor, DontEnum | DontDelete | ReadOnly);
 274     d()->typeErrorPrototype->putDirect(exec->propertyNames().constructor, d()->typeErrorConstructor, DontEnum | DontDelete | ReadOnly);
 275     d()->URIErrorPrototype->putDirect(exec->propertyNames().constructor, d()->URIErrorConstructor, DontEnum | DontDelete | ReadOnly);
 276
 277     // Set global constructors
 278
 279     // FIXME: kjs_window.cpp checks Internal/DontEnum as a performance hack, to
 280     // see that these values can be put directly without a check for override
 281     // properties.
 282
 283     // FIXME: These properties should be handled by a static hash table.
 284
 285     putDirect("Object", d()->objectConstructor, DontEnum);
 286     putDirect("Function", d()->functionConstructor, DontEnum);
 287     putDirect("Array", d()->arrayConstructor, DontEnum);
 288     putDirect("Boolean", d()->booleanConstructor, DontEnum);
 289     putDirect("String", d()->stringConstructor, DontEnum);
 290     putDirect("Number", d()->numberConstructor, DontEnum);
 291     putDirect("Date", d()->dateConstructor, DontEnum);
 292     putDirect("RegExp", d()->regExpConstructor, DontEnum);
 293     putDirect("Error", d()->errorConstructor, DontEnum);
 294     putDirect("EvalError", d()->evalErrorConstructor, Internal);
 295     putDirect("RangeError", d()->rangeErrorConstructor, Internal);
 296     putDirect("ReferenceError", d()->referenceErrorConstructor, Internal);
 297     putDirect("SyntaxError", d()->syntaxErrorConstructor, Internal);
 298     putDirect("TypeError", d()->typeErrorConstructor, Internal);
 299     putDirect("URIError", d()->URIErrorConstructor, Internal);
 300
 301     // Set global values.
 302
 303     putDirect("Math", new MathObjectImp(exec, d()->objectPrototype), DontEnum);
 304
 305     putDirect("NaN", jsNaN(), DontEnum | DontDelete);
 306     putDirect("Infinity", jsNumber(Inf), DontEnum | DontDelete);
 307     putDirect("undefined", jsUndefined(), DontEnum | DontDelete);
 308
 309     // Set global functions.
 310
 311     putDirectFunction(new PrototypeFunction(exec, d()->functionPrototype, 1, "eval", globalFuncEval), DontEnum);
 312     putDirectFunction(new PrototypeFunction(exec, d()->functionPrototype, 2, "parseInt", globalFuncParseInt), DontEnum);
 313     putDirectFunction(new PrototypeFunction(exec, d()->functionPrototype, 1, "parseFloat", globalFuncParseFloat), DontEnum);
 314     putDirectFunction(new PrototypeFunction(exec, d()->functionPrototype, 1, "isNaN", globalFuncIsNaN), DontEnum);
 315     putDirectFunction(new PrototypeFunction(exec, d()->functionPrototype, 1, "isFinite", globalFuncIsFinite), DontEnum);
 316     putDirectFunction(new PrototypeFunction(exec, d()->functionPrototype, 1, "escape", globalFuncEscape), DontEnum);
 317     putDirectFunction(new PrototypeFunction(exec, d()->functionPrototype, 1, "unescape", globalFuncUnescape), DontEnum);
 318     putDirectFunction(new PrototypeFunction(exec, d()->functionPrototype, 1, "decodeURI", globalFuncDecodeURI), DontEnum);
 319     putDirectFunction(new PrototypeFunction(exec, d()->functionPrototype, 1, "decodeURIComponent", globalFuncDecodeURIComponent), DontEnum);
 320     putDirectFunction(new PrototypeFunction(exec, d()->functionPrototype, 1, "encodeURI", globalFuncEncodeURI), DontEnum);
 321     putDirectFunction(new PrototypeFunction(exec, d()->functionPrototype, 1, "encodeURIComponent", globalFuncEncodeURIComponent), DontEnum);
 322 #ifndef NDEBUG
 323     putDirectFunction(new PrototypeFunction(exec, d()->functionPrototype, 1, "kjsprint", globalFuncKJSPrint), DontEnum);
 324 #endif
 325
 326     // Set prototype, and also insert the object prototype at the end of the chain.
 327
 328     setPrototype(prototype);
 329     lastInPrototypeChain(this)->setPrototype(d()->objectPrototype);
 330 }
 331
 332 void JSGlobalObject::startTimeoutCheck()
 333 {
 334     if (!d()->timeoutCheckCount)
 335         resetTimeoutCheck();
 336
 337     ++d()->timeoutCheckCount;
 338 }
 339
 340 void JSGlobalObject::stopTimeoutCheck()
 341 {
 342     --d()->timeoutCheckCount;
 343 }
 344
 345 void JSGlobalObject::resetTimeoutCheck()
 346 {
 347     d()->tickCount = 0;
 348     d()->ticksUntilNextTimeoutCheck = initialTickCountThreshold;
 349     d()->timeAtLastCheckTimeout = 0;
 350     d()->timeExecuting = 0;
 351 }
 352
 353 bool JSGlobalObject::checkTimeout()
 354 {
 355     d()->tickCount = 0;
 356
 357     unsigned currentTime = getCurrentTime();
 358
 359     if (!d()->timeAtLastCheckTimeout) {
 360         // Suspicious amount of looping in a script -- start timing it
 361         d()->timeAtLastCheckTimeout = currentTime;
 362         return false;
 363     }
 364
 365     unsigned timeDiff = currentTime - d()->timeAtLastCheckTimeout;
 366
 367     if (timeDiff == 0)
 368         timeDiff = 1;
 369
 370     d()->timeExecuting += timeDiff;
 371     d()->timeAtLastCheckTimeout = currentTime;
 372
 373     // Adjust the tick threshold so we get the next checkTimeout call in the interval specified in
 374     // preferredScriptCheckTimeInterval
 375     d()->ticksUntilNextTimeoutCheck = (unsigned)((float)preferredScriptCheckTimeInterval / timeDiff) * d()->ticksUntilNextTimeoutCheck;
 376
 377     // If the new threshold is 0 reset it to the default threshold. This can happen if the timeDiff is higher than the
 378     // preferred script check time interval.
 379     if (d()->ticksUntilNextTimeoutCheck == 0)
 380         d()->ticksUntilNextTimeoutCheck = initialTickCountThreshold;
 381
 382     if (shouldInterruptScriptBeforeTimeout())
 383         return true;
 384
 385     if (d()->timeoutTime && d()->timeExecuting > d()->timeoutTime) {
 386         if (shouldInterruptScript())
 387             return true;
 388
 389         resetTimeoutCheck();
 390     }
 391
 392     return false;
 393 }
 394
 395 void JSGlobalObject::saveBuiltins(SavedBuiltins& builtins) const
 396 {
 397     if (!builtins._internal)
 398         builtins._internal = new SavedBuiltinsInternal;
 399
 400     builtins._internal->objectConstructor = d()->objectConstructor;
 401     builtins._internal->functionConstructor = d()->functionConstructor;
 402     builtins._internal->arrayConstructor = d()->arrayConstructor;
 403     builtins._internal->booleanConstructor = d()->booleanConstructor;
 404     builtins._internal->stringConstructor = d()->stringConstructor;
 405     builtins._internal->numberConstructor = d()->numberConstructor;
 406     builtins._internal->dateConstructor = d()->dateConstructor;
 407     builtins._internal->regExpConstructor = d()->regExpConstructor;
 408     builtins._internal->errorConstructor = d()->errorConstructor;
 409     builtins._internal->evalErrorConstructor = d()->evalErrorConstructor;
 410     builtins._internal->rangeErrorConstructor = d()->rangeErrorConstructor;
 411     builtins._internal->referenceErrorConstructor = d()->referenceErrorConstructor;
 412     builtins._internal->syntaxErrorConstructor = d()->syntaxErrorConstructor;
 413     builtins._internal->typeErrorConstructor = d()->typeErrorConstructor;
 414     builtins._internal->URIErrorConstructor = d()->URIErrorConstructor;
 415
 416     builtins._internal->objectPrototype = d()->objectPrototype;
 417     builtins._internal->functionPrototype = d()->functionPrototype;
 418     builtins._internal->arrayPrototype = d()->arrayPrototype;
 419     builtins._internal->booleanPrototype = d()->booleanPrototype;
 420     builtins._internal->stringPrototype = d()->stringPrototype;
 421     builtins._internal->numberPrototype = d()->numberPrototype;
 422     builtins._internal->datePrototype = d()->datePrototype;
 423     builtins._internal->regExpPrototype = d()->regExpPrototype;
 424     builtins._internal->errorPrototype = d()->errorPrototype;
 425     builtins._internal->evalErrorPrototype = d()->evalErrorPrototype;
 426     builtins._internal->rangeErrorPrototype = d()->rangeErrorPrototype;
 427     builtins._internal->referenceErrorPrototype = d()->referenceErrorPrototype;
 428     builtins._internal->syntaxErrorPrototype = d()->syntaxErrorPrototype;
 429     builtins._internal->typeErrorPrototype = d()->typeErrorPrototype;
 430     builtins._internal->URIErrorPrototype = d()->URIErrorPrototype;
 431 }
 432
 433 void JSGlobalObject::restoreBuiltins(const SavedBuiltins& builtins)
 434 {
 435     if (!builtins._internal)
 436         return;
 437
 438     d()->objectConstructor = builtins._internal->objectConstructor;
 439     d()->functionConstructor = builtins._internal->functionConstructor;
 440     d()->arrayConstructor = builtins._internal->arrayConstructor;
 441     d()->booleanConstructor = builtins._internal->booleanConstructor;
 442     d()->stringConstructor = builtins._internal->stringConstructor;
 443     d()->numberConstructor = builtins._internal->numberConstructor;
 444     d()->dateConstructor = builtins._internal->dateConstructor;
 445     d()->regExpConstructor = builtins._internal->regExpConstructor;
 446     d()->errorConstructor = builtins._internal->errorConstructor;
 447     d()->evalErrorConstructor = builtins._internal->evalErrorConstructor;
 448     d()->rangeErrorConstructor = builtins._internal->rangeErrorConstructor;
 449     d()->referenceErrorConstructor = builtins._internal->referenceErrorConstructor;
 450     d()->syntaxErrorConstructor = builtins._internal->syntaxErrorConstructor;
 451     d()->typeErrorConstructor = builtins._internal->typeErrorConstructor;
 452     d()->URIErrorConstructor = builtins._internal->URIErrorConstructor;
 453
 454     d()->objectPrototype = builtins._internal->objectPrototype;
 455     d()->functionPrototype = builtins._internal->functionPrototype;
 456     d()->arrayPrototype = builtins._internal->arrayPrototype;
 457     d()->booleanPrototype = builtins._internal->booleanPrototype;
 458     d()->stringPrototype = builtins._internal->stringPrototype;
 459     d()->numberPrototype = builtins._internal->numberPrototype;
 460     d()->datePrototype = builtins._internal->datePrototype;
 461     d()->regExpPrototype = builtins._internal->regExpPrototype;
 462     d()->errorPrototype = builtins._internal->errorPrototype;
 463     d()->evalErrorPrototype = builtins._internal->evalErrorPrototype;
 464     d()->rangeErrorPrototype = builtins._internal->rangeErrorPrototype;
 465     d()->referenceErrorPrototype = builtins._internal->referenceErrorPrototype;
 466     d()->syntaxErrorPrototype = builtins._internal->syntaxErrorPrototype;
 467     d()->typeErrorPrototype = builtins._internal->typeErrorPrototype;
 468     d()->URIErrorPrototype = builtins._internal->URIErrorPrototype;
 469 }
 470
 471 void JSGlobalObject::mark()
 472 {
 473     JSVariableObject::mark();
 474
 475     markIfNeeded(d()->globalExec.exception());
 476
 477     markIfNeeded(d()->objectConstructor);
 478     markIfNeeded(d()->functionConstructor);
 479     markIfNeeded(d()->arrayConstructor);
 480     markIfNeeded(d()->booleanConstructor);
 481     markIfNeeded(d()->stringConstructor);
 482     markIfNeeded(d()->numberConstructor);
 483     markIfNeeded(d()->dateConstructor);
 484     markIfNeeded(d()->regExpConstructor);
 485     markIfNeeded(d()->errorConstructor);
 486     markIfNeeded(d()->evalErrorConstructor);
 487     markIfNeeded(d()->rangeErrorConstructor);
 488     markIfNeeded(d()->referenceErrorConstructor);
 489     markIfNeeded(d()->syntaxErrorConstructor);
 490     markIfNeeded(d()->typeErrorConstructor);
 491     markIfNeeded(d()->URIErrorConstructor);
 492
 493     markIfNeeded(d()->objectPrototype);
 494     markIfNeeded(d()->functionPrototype);
 495     markIfNeeded(d()->arrayPrototype);
 496     markIfNeeded(d()->booleanPrototype);
 497     markIfNeeded(d()->stringPrototype);
 498     markIfNeeded(d()->numberPrototype);
 499     markIfNeeded(d()->datePrototype);
 500     markIfNeeded(d()->regExpPrototype);
 501     markIfNeeded(d()->errorPrototype);
 502     markIfNeeded(d()->evalErrorPrototype);
 503     markIfNeeded(d()->rangeErrorPrototype);
 504     markIfNeeded(d()->referenceErrorPrototype);
 505     markIfNeeded(d()->syntaxErrorPrototype);
 506     markIfNeeded(d()->typeErrorPrototype);
 507     markIfNeeded(d()->URIErrorPrototype);
 508 }
 509
 510 ExecState* JSGlobalObject::globalExec()
 511 {
 512     return &d()->globalExec;
 513 }
 514
 515 ActivationImp* JSGlobalObject::pushActivation(ExecState* exec)
 516 {
 517     if (d()->activationCount == activationStackNodeSize) {
 518         ActivationStackNode* newNode = new ActivationStackNode;
 519         newNode->prev = d()->activations;
 520         d()->activations = newNode;
 521         d()->activationCount = 0;
 522     }
 523
 524     StackActivation* stackEntry = &d()->activations->data[d()->activationCount++];
 525     stackEntry->activationStorage.init(exec);
 526     return &stackEntry->activationStorage;
 527 }
 528
 529 inline void JSGlobalObject::checkActivationCount()
 530 {
 531     if (!d()->activationCount) {
 532         ActivationStackNode* prev = d()->activations->prev;
 533         ASSERT(prev);
 534         delete d()->activations;
 535         d()->activations = prev;
 536         d()->activationCount = activationStackNodeSize;
 537     }
 538 }
 539
 540 void JSGlobalObject::popActivation()
 541 {
 542     checkActivationCount();
 543     d()->activations->data[--d()->activationCount].activationDataStorage.localStorage.shrink(0);
 544 }
 545
 546 void JSGlobalObject::tearOffActivation(ExecState* exec, bool leaveRelic)
 547 {
 548     ActivationImp* oldActivation = exec->activationObject();
 549     if (!oldActivation || !oldActivation->isOnStack())
 550         return;
 551
 552     ASSERT(exec->codeType() == FunctionCode);
 553     ActivationImp* newActivation = new ActivationImp(*oldActivation->d(), leaveRelic);
 554
 555     if (!leaveRelic) {
 556         checkActivationCount();
 557         d()->activationCount--;
 558     }
 559
 560     oldActivation->d()->localStorage.shrink(0);
 561
 562     exec->setActivationObject(newActivation);
 563     exec->setVariableObject(newActivation);
 564     exec->setLocalStorage(&newActivation->localStorage());
 565     exec->replaceScopeChainTop(newActivation);
 566 }
 567
 568 } // namespace KJS