1 /* 2 * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved. 3 * Copyright (C) 2008 Cameron Zwarich (cwzwarich (at) 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 "JSCallbackConstructor.h" 34 #include "JSCallbackFunction.h" 35 #include "JSCallbackObject.h" 36 37 #include "Arguments.h" 38 #include "ArrayConstructor.h" 39 #include "ArrayPrototype.h" 40 #include "BooleanConstructor.h" 41 #include "BooleanPrototype.h" 42 #include "CodeBlock.h" 43 #include "DateConstructor.h" 44 #include "DatePrototype.h" 45 #include "ErrorConstructor.h" 46 #include "ErrorPrototype.h" 47 #include "FunctionConstructor.h" 48 #include "FunctionPrototype.h" 49 #include "JSFunction.h" 50 #include "JSGlobalObjectFunctions.h" 51 #include "JSLock.h" 52 #include "JSONObject.h" 53 #include "Interpreter.h" 54 #include "MathObject.h" 55 #include "NativeErrorConstructor.h" 56 #include "NativeErrorPrototype.h" 57 #include "NumberConstructor.h" 58 #include "NumberPrototype.h" 59 #include "ObjectConstructor.h" 60 #include "ObjectPrototype.h" 61 #include "Profiler.h" 62 #include "RegExpConstructor.h" 63 #include "RegExpMatchesArray.h" 64 #include "RegExpObject.h" 65 #include "RegExpPrototype.h" 66 #include "ScopeChainMark.h" 67 #include "StringConstructor.h" 68 #include "StringPrototype.h" 69 #include "Debugger.h" 70 71 namespace JSC { 72 73 ASSERT_CLASS_FITS_IN_CELL(JSGlobalObject); 74 75 // Default number of ticks before a timeout check should be done. 76 static const int initialTickCountThreshold = 255; 77 78 // Preferred number of milliseconds between each timeout check 79 static const int preferredScriptCheckTimeInterval = 1000; 80 81 template <typename T> static inline void markIfNeeded(MarkStack& markStack, WriteBarrier<T>* v) 82 { 83 if (*v) 84 markStack.append(v); 85 } 86 87 JSGlobalObject::~JSGlobalObject() 88 { 89 ASSERT(JSLock::currentThreadIsHoldingLock()); 90 91 if (m_debugger) 92 m_debugger->detach(this); 93 94 Profiler** profiler = Profiler::enabledProfilerReference(); 95 if (UNLIKELY(*profiler != 0)) { 96 (*profiler)->stopProfiling(this); 97 } 98 } 99 100 void JSGlobalObject::init(JSObject* thisValue) 101 { 102 ASSERT(JSLock::currentThreadIsHoldingLock()); 103 104 structure()->disableSpecificFunctionTracking(); 105 106 m_globalData = Heap::heap(this)->globalData(); 107 m_globalScopeChain.set(*m_globalData, this, new (m_globalData.get()) ScopeChainNode(0, this, m_globalData.get(), this, thisValue)); 108 109 JSGlobalObject::globalExec()->init(0, 0, m_globalScopeChain.get(), CallFrame::noCaller(), 0, 0); 110 111 m_debugger = 0; 112 113 m_profileGroup = 0; 114 115 reset(prototype()); 116 } 117 118 void JSGlobalObject::put(ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot) 119 { 120 ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this)); 121 122 if (symbolTablePut(exec->globalData(), propertyName, value)) 123 return; 124 JSVariableObject::put(exec, propertyName, value, slot); 125 } 126 127 void JSGlobalObject::putWithAttributes(ExecState* exec, const Identifier& propertyName, JSValue value, unsigned attributes) 128 { 129 ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this)); 130 131 if (symbolTablePutWithAttributes(exec->globalData(), propertyName, value, attributes)) 132 return; 133 134 JSValue valueBefore = getDirect(exec->globalData(), propertyName); 135 PutPropertySlot slot; 136 JSVariableObject::put(exec, propertyName, value, slot); 137 if (!valueBefore) { 138 JSValue valueAfter = getDirect(exec->globalData(), propertyName); 139 if (valueAfter) 140 JSObject::putWithAttributes(exec, propertyName, valueAfter, attributes); 141 } 142 } 143 144 void JSGlobalObject::defineGetter(ExecState* exec, const Identifier& propertyName, JSObject* getterFunc, unsigned attributes) 145 { 146 PropertySlot slot; 147 if (!symbolTableGet(propertyName, slot)) 148 JSVariableObject::defineGetter(exec, propertyName, getterFunc, attributes); 149 } 150 151 void JSGlobalObject::defineSetter(ExecState* exec, const Identifier& propertyName, JSObject* setterFunc, unsigned attributes) 152 { 153 PropertySlot slot; 154 if (!symbolTableGet(propertyName, slot)) 155 JSVariableObject::defineSetter(exec, propertyName, setterFunc, attributes); 156 } 157 158 static inline JSObject* lastInPrototypeChain(JSObject* object) 159 { 160 JSObject* o = object; 161 while (o->prototype().isObject()) 162 o = asObject(o->prototype()); 163 return o; 164 } 165 166 void JSGlobalObject::reset(JSValue prototype) 167 { 168 ExecState* exec = JSGlobalObject::globalExec(); 169 170 // Prototypes 171 172 m_functionPrototype.set(exec->globalData(), this, new (exec) FunctionPrototype(exec, this, FunctionPrototype::createStructure(exec->globalData(), jsNull()))); // The real prototype will be set once ObjectPrototype is created. 173 m_functionStructure.set(exec->globalData(), this, JSFunction::createStructure(exec->globalData(), m_functionPrototype.get())); 174 m_internalFunctionStructure.set(exec->globalData(), this, InternalFunction::createStructure(exec->globalData(), m_functionPrototype.get())); 175 JSFunction* callFunction = 0; 176 JSFunction* applyFunction = 0; 177 m_functionPrototype->addFunctionProperties(exec, this, m_functionStructure.get(), &callFunction, &applyFunction); 178 m_callFunction.set(exec->globalData(), this, callFunction); 179 m_applyFunction.set(exec->globalData(), this, applyFunction); 180 m_objectPrototype.set(exec->globalData(), this, new (exec) ObjectPrototype(exec, this, ObjectPrototype::createStructure(exec->globalData(), jsNull()), m_functionStructure.get())); 181 m_functionPrototype->structure()->setPrototypeWithoutTransition(exec->globalData(), m_objectPrototype.get()); 182 183 m_emptyObjectStructure.set(exec->globalData(), this, m_objectPrototype->inheritorID(exec->globalData())); 184 185 m_callbackFunctionStructure.set(exec->globalData(), this, JSCallbackFunction::createStructure(exec->globalData(), m_functionPrototype.get())); 186 m_argumentsStructure.set(exec->globalData(), this, Arguments::createStructure(exec->globalData(), m_objectPrototype.get())); 187 m_callbackConstructorStructure.set(exec->globalData(), this, JSCallbackConstructor::createStructure(exec->globalData(), m_objectPrototype.get())); 188 m_callbackObjectStructure.set(exec->globalData(), this, JSCallbackObject<JSObjectWithGlobalObject>::createStructure(exec->globalData(), m_objectPrototype.get())); 189 190 m_arrayPrototype.set(exec->globalData(), this, new (exec) ArrayPrototype(this, ArrayPrototype::createStructure(exec->globalData(), m_objectPrototype.get()))); 191 m_arrayStructure.set(exec->globalData(), this, JSArray::createStructure(exec->globalData(), m_arrayPrototype.get())); 192 m_regExpMatchesArrayStructure.set(exec->globalData(), this, RegExpMatchesArray::createStructure(exec->globalData(), m_arrayPrototype.get())); 193 194 m_stringPrototype.set(exec->globalData(), this, new (exec) StringPrototype(exec, this, StringPrototype::createStructure(exec->globalData(), m_objectPrototype.get()))); 195 m_stringObjectStructure.set(exec->globalData(), this, StringObject::createStructure(exec->globalData(), m_stringPrototype.get())); 196 197 m_booleanPrototype.set(exec->globalData(), this, new (exec) BooleanPrototype(exec, this, BooleanPrototype::createStructure(exec->globalData(), m_objectPrototype.get()), m_functionStructure.get())); 198 m_booleanObjectStructure.set(exec->globalData(), this, BooleanObject::createStructure(exec->globalData(), m_booleanPrototype.get())); 199 200 m_numberPrototype.set(exec->globalData(), this, new (exec) NumberPrototype(exec, this, NumberPrototype::createStructure(exec->globalData(), m_objectPrototype.get()), m_functionStructure.get())); 201 m_numberObjectStructure.set(exec->globalData(), this, NumberObject::createStructure(exec->globalData(), m_numberPrototype.get())); 202 203 m_datePrototype.set(exec->globalData(), this, new (exec) DatePrototype(exec, this, DatePrototype::createStructure(exec->globalData(), m_objectPrototype.get()))); 204 m_dateStructure.set(exec->globalData(), this, DateInstance::createStructure(exec->globalData(), m_datePrototype.get())); 205 206 m_regExpPrototype.set(exec->globalData(), this, new (exec) RegExpPrototype(exec, this, RegExpPrototype::createStructure(exec->globalData(), m_objectPrototype.get()), m_functionStructure.get())); 207 m_regExpStructure.set(exec->globalData(), this, RegExpObject::createStructure(exec->globalData(), m_regExpPrototype.get())); 208 209 m_methodCallDummy.set(exec->globalData(), this, constructEmptyObject(exec)); 210 211 ErrorPrototype* errorPrototype = new (exec) ErrorPrototype(exec, this, ErrorPrototype::createStructure(exec->globalData(), m_objectPrototype.get()), m_functionStructure.get()); 212 m_errorStructure.set(exec->globalData(), this, ErrorInstance::createStructure(exec->globalData(), errorPrototype)); 213 214 // Constructors 215 216 JSCell* objectConstructor = new (exec) ObjectConstructor(exec, this, ObjectConstructor::createStructure(exec->globalData(), m_functionPrototype.get()), m_objectPrototype.get()); 217 JSCell* functionConstructor = new (exec) FunctionConstructor(exec, this, FunctionConstructor::createStructure(exec->globalData(), m_functionPrototype.get()), m_functionPrototype.get()); 218 JSCell* arrayConstructor = new (exec) ArrayConstructor(exec, this, ArrayConstructor::createStructure(exec->globalData(), m_functionPrototype.get()), m_arrayPrototype.get(), m_functionStructure.get()); 219 JSCell* stringConstructor = new (exec) StringConstructor(exec, this, StringConstructor::createStructure(exec->globalData(), m_functionPrototype.get()), m_functionStructure.get(), m_stringPrototype.get()); 220 JSCell* booleanConstructor = new (exec) BooleanConstructor(exec, this, BooleanConstructor::createStructure(exec->globalData(), m_functionPrototype.get()), m_booleanPrototype.get()); 221 JSCell* numberConstructor = new (exec) NumberConstructor(exec, this, NumberConstructor::createStructure(exec->globalData(), m_functionPrototype.get()), m_numberPrototype.get()); 222 JSCell* dateConstructor = new (exec) DateConstructor(exec, this, DateConstructor::createStructure(exec->globalData(), m_functionPrototype.get()), m_functionStructure.get(), m_datePrototype.get()); 223 224 m_regExpConstructor.set(exec->globalData(), this, new (exec) RegExpConstructor(exec, this, RegExpConstructor::createStructure(exec->globalData(), m_functionPrototype.get()), m_regExpPrototype.get())); 225 226 m_errorConstructor.set(exec->globalData(), this, new (exec) ErrorConstructor(exec, this, ErrorConstructor::createStructure(exec->globalData(), m_functionPrototype.get()), errorPrototype)); 227 228 Structure* nativeErrorPrototypeStructure = NativeErrorPrototype::createStructure(exec->globalData(), errorPrototype); 229 Structure* nativeErrorStructure = NativeErrorConstructor::createStructure(exec->globalData(), m_functionPrototype.get()); 230 m_evalErrorConstructor.set(exec->globalData(), this, new (exec) NativeErrorConstructor(exec, this, nativeErrorStructure, nativeErrorPrototypeStructure, "EvalError")); 231 m_rangeErrorConstructor.set(exec->globalData(), this, new (exec) NativeErrorConstructor(exec, this, nativeErrorStructure, nativeErrorPrototypeStructure, "RangeError")); 232 m_referenceErrorConstructor.set(exec->globalData(), this, new (exec) NativeErrorConstructor(exec, this, nativeErrorStructure, nativeErrorPrototypeStructure, "ReferenceError")); 233 m_syntaxErrorConstructor.set(exec->globalData(), this, new (exec) NativeErrorConstructor(exec, this, nativeErrorStructure, nativeErrorPrototypeStructure, "SyntaxError")); 234 m_typeErrorConstructor.set(exec->globalData(), this, new (exec) NativeErrorConstructor(exec, this, nativeErrorStructure, nativeErrorPrototypeStructure, "TypeError")); 235 m_URIErrorConstructor.set(exec->globalData(), this, new (exec) NativeErrorConstructor(exec, this, nativeErrorStructure, nativeErrorPrototypeStructure, "URIError")); 236 237 m_objectPrototype->putDirectFunctionWithoutTransition(exec->globalData(), exec->propertyNames().constructor, objectConstructor, DontEnum); 238 m_functionPrototype->putDirectFunctionWithoutTransition(exec->globalData(), exec->propertyNames().constructor, functionConstructor, DontEnum); 239 m_arrayPrototype->putDirectFunctionWithoutTransition(exec->globalData(), exec->propertyNames().constructor, arrayConstructor, DontEnum); 240 m_booleanPrototype->putDirectFunctionWithoutTransition(exec->globalData(), exec->propertyNames().constructor, booleanConstructor, DontEnum); 241 m_stringPrototype->putDirectFunctionWithoutTransition(exec->globalData(), exec->propertyNames().constructor, stringConstructor, DontEnum); 242 m_numberPrototype->putDirectFunctionWithoutTransition(exec->globalData(), exec->propertyNames().constructor, numberConstructor, DontEnum); 243 m_datePrototype->putDirectFunctionWithoutTransition(exec->globalData(), exec->propertyNames().constructor, dateConstructor, DontEnum); 244 m_regExpPrototype->putDirectFunctionWithoutTransition(exec->globalData(), exec->propertyNames().constructor, m_regExpConstructor.get(), DontEnum); 245 errorPrototype->putDirectFunctionWithoutTransition(exec->globalData(), exec->propertyNames().constructor, m_errorConstructor.get(), DontEnum); 246 247 // Set global constructors 248 249 // FIXME: These properties could be handled by a static hash table. 250 251 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "Object"), objectConstructor, DontEnum); 252 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "Function"), functionConstructor, DontEnum); 253 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "Array"), arrayConstructor, DontEnum); 254 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "Boolean"), booleanConstructor, DontEnum); 255 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "String"), stringConstructor, DontEnum); 256 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "Number"), numberConstructor, DontEnum); 257 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "Date"), dateConstructor, DontEnum); 258 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "RegExp"), m_regExpConstructor.get(), DontEnum); 259 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "Error"), m_errorConstructor.get(), DontEnum); 260 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "EvalError"), m_evalErrorConstructor.get(), DontEnum); 261 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "RangeError"), m_rangeErrorConstructor.get(), DontEnum); 262 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "ReferenceError"), m_referenceErrorConstructor.get(), DontEnum); 263 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "SyntaxError"), m_syntaxErrorConstructor.get(), DontEnum); 264 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "TypeError"), m_typeErrorConstructor.get(), DontEnum); 265 putDirectFunctionWithoutTransition(exec->globalData(), Identifier(exec, "URIError"), m_URIErrorConstructor.get(), DontEnum); 266 267 // Set global values. 268 GlobalPropertyInfo staticGlobals[] = { 269 GlobalPropertyInfo(Identifier(exec, "Math"), new (exec) MathObject(exec, this, MathObject::createStructure(exec->globalData(), m_objectPrototype.get())), DontEnum | DontDelete), 270 GlobalPropertyInfo(Identifier(exec, "NaN"), jsNaN(), DontEnum | DontDelete | ReadOnly), 271 GlobalPropertyInfo(Identifier(exec, "Infinity"), jsNumber(Inf), DontEnum | DontDelete | ReadOnly), 272 GlobalPropertyInfo(Identifier(exec, "undefined"), jsUndefined(), DontEnum | DontDelete | ReadOnly), 273 GlobalPropertyInfo(Identifier(exec, "JSON"), new (exec) JSONObject(this, JSONObject::createStructure(exec->globalData(), m_objectPrototype.get())), DontEnum | DontDelete) 274 }; 275 276 addStaticGlobals(staticGlobals, WTF_ARRAY_LENGTH(staticGlobals)); 277 278 // Set global functions. 279 280 m_evalFunction.set(exec->globalData(), this, new (exec) JSFunction(exec, this, m_functionStructure.get(), 1, exec->propertyNames().eval, globalFuncEval)); 281 putDirectFunctionWithoutTransition(exec, m_evalFunction.get(), DontEnum); 282 putDirectFunctionWithoutTransition(exec, new (exec) JSFunction(exec, this, m_functionStructure.get(), 2, Identifier(exec, "parseInt"), globalFuncParseInt), DontEnum); 283 putDirectFunctionWithoutTransition(exec, new (exec) JSFunction(exec, this, m_functionStructure.get(), 1, Identifier(exec, "parseFloat"), globalFuncParseFloat), DontEnum); 284 putDirectFunctionWithoutTransition(exec, new (exec) JSFunction(exec, this, m_functionStructure.get(), 1, Identifier(exec, "isNaN"), globalFuncIsNaN), DontEnum); 285 putDirectFunctionWithoutTransition(exec, new (exec) JSFunction(exec, this, m_functionStructure.get(), 1, Identifier(exec, "isFinite"), globalFuncIsFinite), DontEnum); 286 putDirectFunctionWithoutTransition(exec, new (exec) JSFunction(exec, this, m_functionStructure.get(), 1, Identifier(exec, "escape"), globalFuncEscape), DontEnum); 287 putDirectFunctionWithoutTransition(exec, new (exec) JSFunction(exec, this, m_functionStructure.get(), 1, Identifier(exec, "unescape"), globalFuncUnescape), DontEnum); 288 putDirectFunctionWithoutTransition(exec, new (exec) JSFunction(exec, this, m_functionStructure.get(), 1, Identifier(exec, "decodeURI"), globalFuncDecodeURI), DontEnum); 289 putDirectFunctionWithoutTransition(exec, new (exec) JSFunction(exec, this, m_functionStructure.get(), 1, Identifier(exec, "decodeURIComponent"), globalFuncDecodeURIComponent), DontEnum); 290 putDirectFunctionWithoutTransition(exec, new (exec) JSFunction(exec, this, m_functionStructure.get(), 1, Identifier(exec, "encodeURI"), globalFuncEncodeURI), DontEnum); 291 putDirectFunctionWithoutTransition(exec, new (exec) JSFunction(exec, this, m_functionStructure.get(), 1, Identifier(exec, "encodeURIComponent"), globalFuncEncodeURIComponent), DontEnum); 292 #ifndef NDEBUG 293 putDirectFunctionWithoutTransition(exec, new (exec) JSFunction(exec, this, m_functionStructure.get(), 1, Identifier(exec, "jscprint"), globalFuncJSCPrint), DontEnum); 294 #endif 295 296 resetPrototype(exec->globalData(), prototype); 297 } 298 299 // Set prototype, and also insert the object prototype at the end of the chain. 300 void JSGlobalObject::resetPrototype(JSGlobalData& globalData, JSValue prototype) 301 { 302 setPrototype(globalData, prototype); 303 304 JSObject* oldLastInPrototypeChain = lastInPrototypeChain(this); 305 JSObject* objectPrototype = m_objectPrototype.get(); 306 if (oldLastInPrototypeChain != objectPrototype) 307 oldLastInPrototypeChain->setPrototype(globalData, objectPrototype); 308 } 309 310 void JSGlobalObject::markChildren(MarkStack& markStack) 311 { 312 JSVariableObject::markChildren(markStack); 313 314 markIfNeeded(markStack, &m_globalScopeChain); 315 markIfNeeded(markStack, &m_methodCallDummy); 316 317 markIfNeeded(markStack, &m_regExpConstructor); 318 markIfNeeded(markStack, &m_errorConstructor); 319 markIfNeeded(markStack, &m_evalErrorConstructor); 320 markIfNeeded(markStack, &m_rangeErrorConstructor); 321 markIfNeeded(markStack, &m_referenceErrorConstructor); 322 markIfNeeded(markStack, &m_syntaxErrorConstructor); 323 markIfNeeded(markStack, &m_typeErrorConstructor); 324 markIfNeeded(markStack, &m_URIErrorConstructor); 325 326 markIfNeeded(markStack, &m_evalFunction); 327 markIfNeeded(markStack, &m_callFunction); 328 markIfNeeded(markStack, &m_applyFunction); 329 330 markIfNeeded(markStack, &m_objectPrototype); 331 markIfNeeded(markStack, &m_functionPrototype); 332 markIfNeeded(markStack, &m_arrayPrototype); 333 markIfNeeded(markStack, &m_booleanPrototype); 334 markIfNeeded(markStack, &m_stringPrototype); 335 markIfNeeded(markStack, &m_numberPrototype); 336 markIfNeeded(markStack, &m_datePrototype); 337 markIfNeeded(markStack, &m_regExpPrototype); 338 339 markIfNeeded(markStack, &m_argumentsStructure); 340 markIfNeeded(markStack, &m_arrayStructure); 341 markIfNeeded(markStack, &m_booleanObjectStructure); 342 markIfNeeded(markStack, &m_callbackConstructorStructure); 343 markIfNeeded(markStack, &m_callbackFunctionStructure); 344 markIfNeeded(markStack, &m_callbackObjectStructure); 345 markIfNeeded(markStack, &m_dateStructure); 346 markIfNeeded(markStack, &m_emptyObjectStructure); 347 markIfNeeded(markStack, &m_errorStructure); 348 markIfNeeded(markStack, &m_functionStructure); 349 markIfNeeded(markStack, &m_numberObjectStructure); 350 markIfNeeded(markStack, &m_regExpMatchesArrayStructure); 351 markIfNeeded(markStack, &m_regExpStructure); 352 markIfNeeded(markStack, &m_stringObjectStructure); 353 markIfNeeded(markStack, &m_internalFunctionStructure); 354 355 if (m_registerArray) { 356 // Outside the execution of global code, when our variables are torn off, 357 // we can mark the torn-off array. 358 markStack.appendValues(m_registerArray.get(), m_registerArraySize); 359 } else if (m_registers) { 360 // During execution of global code, when our variables are in the register file, 361 // the symbol table tells us how many variables there are, and registers 362 // points to where they end, and the registers used for execution begin. 363 markStack.appendValues(m_registers - symbolTable().size(), symbolTable().size()); 364 } 365 } 366 367 ExecState* JSGlobalObject::globalExec() 368 { 369 return CallFrame::create(m_globalCallFrame + RegisterFile::CallFrameHeaderSize); 370 } 371 372 bool JSGlobalObject::isDynamicScope(bool&) const 373 { 374 return true; 375 } 376 377 void JSGlobalObject::copyGlobalsFrom(RegisterFile& registerFile) 378 { 379 ASSERT(!m_registerArray); 380 ASSERT(!m_registerArraySize); 381 382 int numGlobals = registerFile.numGlobals(); 383 if (!numGlobals) { 384 m_registers = 0; 385 return; 386 } 387 388 OwnArrayPtr<WriteBarrier<Unknown> > registerArray = copyRegisterArray(globalData(), reinterpret_cast<WriteBarrier<Unknown>*>(registerFile.lastGlobal()), numGlobals, numGlobals); 389 WriteBarrier<Unknown>* registers = registerArray.get() + numGlobals; 390 setRegisters(registers, registerArray.release(), numGlobals); 391 } 392 393 void JSGlobalObject::copyGlobalsTo(RegisterFile& registerFile) 394 { 395 JSGlobalObject* lastGlobalObject = registerFile.globalObject(); 396 if (lastGlobalObject && lastGlobalObject != this) 397 lastGlobalObject->copyGlobalsFrom(registerFile); 398 399 registerFile.setGlobalObject(this); 400 registerFile.setNumGlobals(symbolTable().size()); 401 402 if (m_registerArray) { 403 // The register file is always a gc root so no barrier is needed here 404 memcpy(registerFile.start() - m_registerArraySize, m_registerArray.get(), m_registerArraySize * sizeof(WriteBarrier<Unknown>)); 405 setRegisters(reinterpret_cast<WriteBarrier<Unknown>*>(registerFile.start()), nullptr, 0); 406 } 407 } 408 409 void JSGlobalObject::resizeRegisters(int oldSize, int newSize) 410 { 411 ASSERT(oldSize <= newSize); 412 if (newSize == oldSize) 413 return; 414 ASSERT(newSize && newSize > oldSize); 415 if (m_registerArray || !m_registers) { 416 ASSERT(static_cast<size_t>(oldSize) == m_registerArraySize); 417 OwnArrayPtr<WriteBarrier<Unknown> > registerArray = adoptArrayPtr(new WriteBarrier<Unknown>[newSize]); 418 for (int i = 0; i < oldSize; i++) 419 registerArray[newSize - oldSize + i].set(globalData(), this, m_registerArray[i].get()); 420 WriteBarrier<Unknown>* registers = registerArray.get() + newSize; 421 setRegisters(registers, registerArray.release(), newSize); 422 } else { 423 ASSERT(static_cast<size_t>(newSize) < globalData().interpreter->registerFile().maxGlobals()); 424 globalData().interpreter->registerFile().setNumGlobals(newSize); 425 } 426 427 for (int i = -newSize; i < -oldSize; ++i) 428 m_registers[i].setUndefined(); 429 } 430 431 void* JSGlobalObject::operator new(size_t size, JSGlobalData* globalData) 432 { 433 return globalData->heap.allocate(size); 434 } 435 436 DynamicGlobalObjectScope::DynamicGlobalObjectScope(JSGlobalData& globalData, JSGlobalObject* dynamicGlobalObject) 437 : m_dynamicGlobalObjectSlot(globalData.dynamicGlobalObject) 438 , m_savedDynamicGlobalObject(m_dynamicGlobalObjectSlot) 439 { 440 if (!m_dynamicGlobalObjectSlot) { 441 #if ENABLE(ASSEMBLER) 442 if (ExecutableAllocator::underMemoryPressure()) 443 globalData.recompileAllJSFunctions(); 444 #endif 445 446 m_dynamicGlobalObjectSlot = dynamicGlobalObject; 447 448 // Reset the date cache between JS invocations to force the VM 449 // to observe time zone changes. 450 globalData.resetDateCache(); 451 } 452 } 453 454 } // namespace JSC 455
