/* * Copyright (C) 2016 Apple Inc. All rights reserved. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * */ #ifndef JSArrayInlines_h #define JSArrayInlines_h #include "JSArray.h" #include "JSCellInlines.h" #include "Structure.h" namespace JSC { IndexingType JSArray::mergeIndexingTypeForCopying(IndexingType other) { IndexingType type = indexingType(); if (!(type & IsArray && other & IsArray)) return NonArray; if (hasAnyArrayStorage(type) || hasAnyArrayStorage(other)) return NonArray; if (type == ArrayWithUndecided) return other; if (other == ArrayWithUndecided) return type; // We can memcpy an Int32 and a Contiguous into a Contiguous array since // both share the same memory layout for Int32 numbers. if ((type == ArrayWithInt32 || type == ArrayWithContiguous) && (other == ArrayWithInt32 || other == ArrayWithContiguous)) { if (other == ArrayWithContiguous) return other; return type; } if (type != other) return NonArray; return type; } bool JSArray::canFastCopy(VM& vm, JSArray* otherArray) { if (hasAnyArrayStorage(indexingType()) || hasAnyArrayStorage(otherArray->indexingType())) return false; // FIXME: We should have a watchpoint for indexed properties on Array.prototype and Object.prototype // instead of walking the prototype chain. https://bugs.webkit.org/show_bug.cgi?id=155592 if (structure(vm)->holesMustForwardToPrototype(vm) || otherArray->structure(vm)->holesMustForwardToPrototype(vm)) return false; return true; } } // namespace JSC #endif /* JSArrayInlines_h */