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ladybird/Libraries/LibJS/Runtime/ArrayIterator.cpp

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LibJS: Start implementing iterable framework, add ArrayIterator With the addition of symbol keys, work can now be done on starting to implement the well-known symbol functionality. The most important of these well-known symbols is by far Symbol.iterator. This patch adds IteratorPrototype, as well as ArrayIterator and ArrayIteratorPrototype. In the future, sometime after StringIterator has also been added, this will allow us to use Symbol.iterator directly in for..of loops, enabling the use of custom iterator objects. Also makes adding iterator support to native objects much easier (as will have to be done for Map and Set, when they get added).
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/*
Userland: Use mattco@serenityos.org for my copyright headers
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* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
LibJS: Start implementing iterable framework, add ArrayIterator With the addition of symbol keys, work can now be done on starting to implement the well-known symbol functionality. The most important of these well-known symbols is by far Symbol.iterator. This patch adds IteratorPrototype, as well as ArrayIterator and ArrayIteratorPrototype. In the future, sometime after StringIterator has also been added, this will allow us to use Symbol.iterator directly in for..of loops, enabling the use of custom iterator objects. Also makes adding iterator support to native objects much easier (as will have to be done for Map and Set, when they get added).
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*
Everything: Move to SPDX license identifiers in all files. SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
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* SPDX-License-Identifier: BSD-2-Clause
LibJS: Start implementing iterable framework, add ArrayIterator With the addition of symbol keys, work can now be done on starting to implement the well-known symbol functionality. The most important of these well-known symbols is by far Symbol.iterator. This patch adds IteratorPrototype, as well as ArrayIterator and ArrayIteratorPrototype. In the future, sometime after StringIterator has also been added, this will allow us to use Symbol.iterator directly in for..of loops, enabling the use of custom iterator objects. Also makes adding iterator support to native objects much easier (as will have to be done for Map and Set, when they get added).
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*/
#include <LibJS/Runtime/ArrayIterator.h>
#include <LibJS/Runtime/GlobalObject.h>
namespace JS {
LibGC+Everywhere: Factor out a LibGC from LibJS Resulting in a massive rename across almost everywhere! Alongside the namespace change, we now have the following names: * JS::NonnullGCPtr -> GC::Ref * JS::GCPtr -> GC::Ptr * JS::HeapFunction -> GC::Function * JS::CellImpl -> GC::Cell * JS::Handle -> GC::Root
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GC_DEFINE_ALLOCATOR(ArrayIterator);
LibJS: Segregate GC-allocated objects by type This patch adds two macros to declare per-type allocators: - JS_DECLARE_ALLOCATOR(TypeName) - JS_DEFINE_ALLOCATOR(TypeName) When used, they add a type-specific CellAllocator that the Heap will delegate allocation requests to. The result of this is that GC objects of the same type always end up within the same HeapBlock, drastically reducing the ability to perform type confusion attacks. It also improves HeapBlock utilization, since each block now has cells sized exactly to the type used within that block. (Previously we only had a handful of block sizes available, and most GC allocations ended up with a large amount of slack in their tails.) There is a small performance hit from this, but I'm sure we can make up for it elsewhere. Note that the old size-based allocators still exist, and we fall back to them for any type that doesn't have its own CellAllocator.
2023-11-19 08:45:05 +00:00
LibGC+Everywhere: Factor out a LibGC from LibJS Resulting in a massive rename across almost everywhere! Alongside the namespace change, we now have the following names: * JS::NonnullGCPtr -> GC::Ref * JS::GCPtr -> GC::Ptr * JS::HeapFunction -> GC::Function * JS::CellImpl -> GC::Cell * JS::Handle -> GC::Root
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GC::Ref<ArrayIterator> ArrayIterator::create(Realm& realm, Value array, Object::PropertyKind iteration_kind)
LibJS: Start implementing iterable framework, add ArrayIterator With the addition of symbol keys, work can now be done on starting to implement the well-known symbol functionality. The most important of these well-known symbols is by far Symbol.iterator. This patch adds IteratorPrototype, as well as ArrayIterator and ArrayIteratorPrototype. In the future, sometime after StringIterator has also been added, this will allow us to use Symbol.iterator directly in for..of loops, enabling the use of custom iterator objects. Also makes adding iterator support to native objects much easier (as will have to be done for Map and Set, when they get added).
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{
LibJS+LibWeb: Use realm.create<T> instead of heap.allocate<T> The main motivation behind this is to remove JS specifics of the Realm from the implementation of the Heap. As a side effect of this change, this is a bit nicer to read than the previous approach, and in my opinion, also makes it a little more clear that this method is specific to a JavaScript Realm.
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return realm.create<ArrayIterator>(array, iteration_kind, realm.intrinsics().array_iterator_prototype());
LibJS: Start implementing iterable framework, add ArrayIterator With the addition of symbol keys, work can now be done on starting to implement the well-known symbol functionality. The most important of these well-known symbols is by far Symbol.iterator. This patch adds IteratorPrototype, as well as ArrayIterator and ArrayIteratorPrototype. In the future, sometime after StringIterator has also been added, this will allow us to use Symbol.iterator directly in for..of loops, enabling the use of custom iterator objects. Also makes adding iterator support to native objects much easier (as will have to be done for Map and Set, when they get added).
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}
LibJS: Consistently make prototype the last argument in Object ctors This is so that we can reliably allocate them in a template function, e.g. in ordinary_create_from_constructor(): global_object.heap().allocate<T>( global_object, forward<Args>(args)..., *prototype); The majority of objects already take the prototype as the last argument, so I updated the ones that didn't.
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ArrayIterator::ArrayIterator(Value array, Object::PropertyKind iteration_kind, Object& prototype)
LibJS: Remove Object(Object& prototype) footgun This constructor was easily confused with a copy constructor, and it was possible to accidentally copy-construct Objects in at least one way that we dicovered (via generic ThrowCompletionOr construction). This patch adds a mandatory ConstructWithPrototypeTag parameter to the constructor to disambiguate it.
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: Object(ConstructWithPrototypeTag::Tag, prototype)
LibJS: Start implementing iterable framework, add ArrayIterator With the addition of symbol keys, work can now be done on starting to implement the well-known symbol functionality. The most important of these well-known symbols is by far Symbol.iterator. This patch adds IteratorPrototype, as well as ArrayIterator and ArrayIteratorPrototype. In the future, sometime after StringIterator has also been added, this will allow us to use Symbol.iterator directly in for..of loops, enabling the use of custom iterator objects. Also makes adding iterator support to native objects much easier (as will have to be done for Map and Set, when they get added).
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, m_array(array)
, m_iteration_kind(iteration_kind)
{
}
LibJS: Rename Cell::visit_children() => Cell::visit_edges() The GC heap is really a graph of cells, so "children" didn't quite feel appropriate here.
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void ArrayIterator::visit_edges(Cell::Visitor& visitor)
LibJS: ArrayIterator needs to mark the array it's iterating
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{
LibJS: Rename Cell::visit_children() => Cell::visit_edges() The GC heap is really a graph of cells, so "children" didn't quite feel appropriate here.
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Base::visit_edges(visitor);
LibJS: ArrayIterator needs to mark the array it's iterating
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visitor.visit(m_array);
}
LibJS: Start implementing iterable framework, add ArrayIterator With the addition of symbol keys, work can now be done on starting to implement the well-known symbol functionality. The most important of these well-known symbols is by far Symbol.iterator. This patch adds IteratorPrototype, as well as ArrayIterator and ArrayIteratorPrototype. In the future, sometime after StringIterator has also been added, this will allow us to use Symbol.iterator directly in for..of loops, enabling the use of custom iterator objects. Also makes adding iterator support to native objects much easier (as will have to be done for Map and Set, when they get added).
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}
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