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 "Operations.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 ASSERT_HAS_TRIVIAL_DESTRUCTOR(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(JSGlobalObject* globalObject, Structure* structure)
  58     : InternalFunction(globalObject, structure)
  59 {
  60 }
  61
  62 void ArrayConstructor::finishCreation(ExecState* exec, ArrayPrototype* arrayPrototype)
  63 {
  64     Base::finishCreation(exec->vm(), arrayPrototype->classInfo()->className);
  65     putDirectWithoutTransition(exec->vm(), exec->propertyNames().prototype, arrayPrototype, DontEnum | DontDelete | ReadOnly);
  66     putDirectWithoutTransition(exec->vm(), exec->propertyNames().length, jsNumber(1), ReadOnly | DontEnum | DontDelete);
  67 }
  68
  69 bool ArrayConstructor::getOwnPropertySlot(JSCell* cell, ExecState* exec, PropertyName propertyName, PropertySlot &slot)
  70 {
  71     return getStaticFunctionSlot<InternalFunction>(exec, ExecState::arrayConstructorTable(exec), jsCast<ArrayConstructor*>(cell), propertyName, slot);
  72 }
  73
  74 bool ArrayConstructor::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor)
  75 {
  76     return getStaticFunctionDescriptor<InternalFunction>(exec, ExecState::arrayConstructorTable(exec), jsCast<ArrayConstructor*>(object), propertyName, descriptor);
  77 }
  78
  79 // ------------------------------ Functions ---------------------------
  80
  81 JSObject* constructArrayWithSizeQuirk(ExecState* exec, ArrayAllocationProfile* profile, JSGlobalObject* globalObject, JSValue length)
  82 {
  83     if (!length.isNumber())
  84         return constructArray(exec, profile, globalObject, &length, 1);
  85
  86     uint32_t n = length.toUInt32(exec);
  87     if (n != length.toNumber(exec))
  88         return throwError(exec, createRangeError(exec, ASCIILiteral("Array size is not a small enough positive integer.")));
  89     return constructEmptyArray(exec, profile, globalObject, n);
  90 }
  91
  92 static inline JSObject* constructArrayWithSizeQuirk(ExecState* exec, const ArgList& args)
  93 {
  94     JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject();
  95
  96     // a single numeric argument denotes the array size (!)
  97     if (args.size() == 1)
  98         return constructArrayWithSizeQuirk(exec, 0, globalObject, args.at(0));
  99
 100     // otherwise the array is constructed with the arguments in it
 101     return constructArray(exec, 0, globalObject, args);
 102 }
 103
 104 static EncodedJSValue JSC_HOST_CALL constructWithArrayConstructor(ExecState* exec)
 105 {
 106     ArgList args(exec);
 107     return JSValue::encode(constructArrayWithSizeQuirk(exec, args));
 108 }
 109
 110 ConstructType ArrayConstructor::getConstructData(JSCell*, ConstructData& constructData)
 111 {
 112     constructData.native.function = constructWithArrayConstructor;
 113     return ConstructTypeHost;
 114 }
 115
 116 static EncodedJSValue JSC_HOST_CALL callArrayConstructor(ExecState* exec)
 117 {
 118     ArgList args(exec);
 119     return JSValue::encode(constructArrayWithSizeQuirk(exec, args));
 120 }
 121
 122 CallType ArrayConstructor::getCallData(JSCell*, CallData& callData)
 123 {
 124     // equivalent to 'new Array(....)'
 125     callData.native.function = callArrayConstructor;
 126     return CallTypeHost;
 127 }
 128
 129 EncodedJSValue JSC_HOST_CALL arrayConstructorIsArray(ExecState* exec)
 130 {
 131     return JSValue::encode(jsBoolean(exec->argument(0).inherits(&JSArray::s_info)));
 132 }
 133
 134 } // namespace JSC