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, &arrayConstructorTable, CREATE_METHOD_TABLE(ArrayConstructor) };
  50
  51 /* Source for ArrayConstructor.lut.h
  52 @begin arrayConstructorTable
  53   isArray   arrayConstructorIsArray     DontEnum|Function 1
  54   of        arrayConstructorOf          DontEnum|Function 0
  55   from      arrayConstructorFrom        DontEnum|Function 0
  56 @end
  57 */
  58
  59 ArrayConstructor::ArrayConstructor(VM& vm, Structure* structure)
  60     : InternalFunction(vm, structure)
  61 {
  62 }
  63
  64 void ArrayConstructor::finishCreation(VM& vm, ArrayPrototype* arrayPrototype)
  65 {
  66     Base::finishCreation(vm, arrayPrototype->classInfo()->className);
  67     putDirectWithoutTransition(vm, vm.propertyNames->prototype, arrayPrototype, DontEnum | DontDelete | ReadOnly);
  68     putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(1), ReadOnly | DontEnum | DontDelete);
  69 }
  70
  71 bool ArrayConstructor::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot &slot)
  72 {
  73     return getStaticFunctionSlot<InternalFunction>(exec, arrayConstructorTable, jsCast<ArrayConstructor*>(object), propertyName, slot);
  74 }
  75
  76 // ------------------------------ Functions ---------------------------
  77
  78 JSObject* constructArrayWithSizeQuirk(ExecState* exec, ArrayAllocationProfile* profile, JSGlobalObject* globalObject, JSValue length)
  79 {
  80     if (!length.isNumber())
  81         return constructArrayNegativeIndexed(exec, profile, globalObject, &length, 1);
  82
  83     uint32_t n = length.toUInt32(exec);
  84     if (n != length.toNumber(exec))
  85         return exec->vm().throwException(exec, createRangeError(exec, ASCIILiteral("Array size is not a small enough positive integer.")));
  86     return constructEmptyArray(exec, profile, globalObject, n);
  87 }
  88
  89 static inline JSObject* constructArrayWithSizeQuirk(ExecState* exec, const ArgList& args)
  90 {
  91     JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject();
  92
  93     // a single numeric argument denotes the array size (!)
  94     if (args.size() == 1)
  95         return constructArrayWithSizeQuirk(exec, 0, globalObject, args.at(0));
  96
  97     // otherwise the array is constructed with the arguments in it
  98     return constructArray(exec, 0, globalObject, args);
  99 }
 100
 101 static EncodedJSValue JSC_HOST_CALL constructWithArrayConstructor(ExecState* exec)
 102 {
 103     ArgList args(exec);
 104     return JSValue::encode(constructArrayWithSizeQuirk(exec, args));
 105 }
 106
 107 ConstructType ArrayConstructor::getConstructData(JSCell*, ConstructData& constructData)
 108 {
 109     constructData.native.function = constructWithArrayConstructor;
 110     return ConstructTypeHost;
 111 }
 112
 113 static EncodedJSValue JSC_HOST_CALL callArrayConstructor(ExecState* exec)
 114 {
 115     ArgList args(exec);
 116     return JSValue::encode(constructArrayWithSizeQuirk(exec, args));
 117 }
 118
 119 CallType ArrayConstructor::getCallData(JSCell*, CallData& callData)
 120 {
 121     // equivalent to 'new Array(....)'
 122     callData.native.function = callArrayConstructor;
 123     return CallTypeHost;
 124 }
 125
 126 EncodedJSValue JSC_HOST_CALL arrayConstructorIsArray(ExecState* exec)
 127 {
 128     return JSValue::encode(jsBoolean(exec->argument(0).inherits(JSArray::info())));
 129 }
 130
 131 } // namespace JSC