runtime/ArrayConstructor.cpp

   1 /*
   2  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2003, 2007, 2008, 2011 Apple Inc. All rights reserved.
   4  *  Copyright (C) 2003 Peter Kelly (pmk@post.com)
   5  *  Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
   6  *
   7  *  This library is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU Lesser General Public
   9  *  License as published by the Free Software Foundation; either
  10  *  version 2 of the License, or (at your option) any later version.
  11  *
  12  *  This library is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  Lesser General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Lesser General Public
  18  *  License along with this library; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
  20  *  USA
  21  *
  22  */
  23
  24 #include "config.h"
  25 #include "ArrayConstructor.h"
  26
  27 #include "ArrayPrototype.h"
  28 #include "ButterflyInlines.h"
  29 #include "CopiedSpaceInlines.h"
  30 #include "Error.h"
  31 #include "ExceptionHelpers.h"
  32 #include "JSArray.h"
  33 #include "JSFunction.h"
  34 #include "Lookup.h"
  35 #include "JSCInlines.h"
  36
  37 namespace JSC {
  38
  39 static EncodedJSValue JSC_HOST_CALL arrayConstructorIsArray(ExecState*);
  40
  41 }
  42
  43 #include "ArrayConstructor.lut.h"
  44
  45 namespace JSC {
  46
  47 STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(ArrayConstructor);
  48
  49 const ClassInfo ArrayConstructor::s_info = { "Function", &InternalFunction::s_info, 0, ExecState::arrayConstructorTable, CREATE_METHOD_TABLE(ArrayConstructor) };
  50
  51 /* Source for ArrayConstructor.lut.h
  52 @begin arrayConstructorTable
  53   isArray   arrayConstructorIsArray     DontEnum|Function 1
  54 @end
  55 */
  56
  57 ArrayConstructor::ArrayConstructor(VM& vm, Structure* structure)
  58     : InternalFunction(vm, structure)
  59 {
  60 }
  61
  62 void ArrayConstructor::finishCreation(VM& vm, ArrayPrototype* arrayPrototype)
  63 {
  64     Base::finishCreation(vm, arrayPrototype->classInfo()->className);
  65     putDirectWithoutTransition(vm, vm.propertyNames->prototype, arrayPrototype, DontEnum | DontDelete | ReadOnly);
  66     putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(1), ReadOnly | DontEnum | DontDelete);
  67 }
  68
  69 bool ArrayConstructor::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot &slot)
  70 {
  71     return getStaticFunctionSlot<InternalFunction>(exec, ExecState::arrayConstructorTable(exec->vm()), jsCast<ArrayConstructor*>(object), propertyName, slot);
  72 }
  73
  74 // ------------------------------ Functions ---------------------------
  75
  76 JSObject* constructArrayWithSizeQuirk(ExecState* exec, ArrayAllocationProfile* profile, JSGlobalObject* globalObject, JSValue length)
  77 {
  78     if (!length.isNumber())
  79         return constructArrayNegativeIndexed(exec, profile, globalObject, &length, 1);
  80
  81     uint32_t n = length.toUInt32(exec);
  82     if (n != length.toNumber(exec))
  83         return exec->vm().throwException(exec, createRangeError(exec, ASCIILiteral("Array size is not a small enough positive integer.")));
  84     return constructEmptyArray(exec, profile, globalObject, n);
  85 }
  86
  87 static inline JSObject* constructArrayWithSizeQuirk(ExecState* exec, const ArgList& args)
  88 {
  89     JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject();
  90
  91     // a single numeric argument denotes the array size (!)
  92     if (args.size() == 1)
  93         return constructArrayWithSizeQuirk(exec, 0, globalObject, args.at(0));
  94
  95     // otherwise the array is constructed with the arguments in it
  96     return constructArray(exec, 0, globalObject, args);
  97 }
  98
  99 static EncodedJSValue JSC_HOST_CALL constructWithArrayConstructor(ExecState* exec)
 100 {
 101     ArgList args(exec);
 102     return JSValue::encode(constructArrayWithSizeQuirk(exec, args));
 103 }
 104
 105 ConstructType ArrayConstructor::getConstructData(JSCell*, ConstructData& constructData)
 106 {
 107     constructData.native.function = constructWithArrayConstructor;
 108     return ConstructTypeHost;
 109 }
 110
 111 static EncodedJSValue JSC_HOST_CALL callArrayConstructor(ExecState* exec)
 112 {
 113     ArgList args(exec);
 114     return JSValue::encode(constructArrayWithSizeQuirk(exec, args));
 115 }
 116
 117 CallType ArrayConstructor::getCallData(JSCell*, CallData& callData)
 118 {
 119     // equivalent to 'new Array(....)'
 120     callData.native.function = callArrayConstructor;
 121     return CallTypeHost;
 122 }
 123
 124 EncodedJSValue JSC_HOST_CALL arrayConstructorIsArray(ExecState* exec)
 125 {
 126     return JSValue::encode(jsBoolean(exec->argument(0).inherits(JSArray::info())));
 127 }
 128
 129 } // namespace JSC