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ladybird/Userland/Libraries/LibJS/Runtime/Cell.cpp

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LibJS: Add a basic mark&sweep garbage collector :^) Objects can now be allocated via the interpreter's heap. Objects that are allocated in this way will need to be provably reachable from at least one of the known object graph roots. The roots are currently determined by Heap::collect_roots(). Anything that wants be collectable garbage should inherit from Cell, the fundamental atom of the GC heap. This is pretty neat! :^)
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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
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: Add a basic mark&sweep garbage collector :^) Objects can now be allocated via the interpreter's heap. Objects that are allocated in this way will need to be provably reachable from at least one of the known object graph roots. The roots are currently determined by Heap::collect_roots(). Anything that wants be collectable garbage should inherit from Cell, the fundamental atom of the GC heap. This is pretty neat! :^)
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*/
LibJS: Add "Heap" and "Runtime" subdirectories Let's try to keep LibJS tidy as it expands. :^)
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#include <LibJS/Heap/Heap.h>
#include <LibJS/Heap/HeapBlock.h>
#include <LibJS/Runtime/Cell.h>
#include <LibJS/Runtime/Value.h>
LibJS: Add a basic mark&sweep garbage collector :^) Objects can now be allocated via the interpreter's heap. Objects that are allocated in this way will need to be provably reachable from at least one of the known object graph roots. The roots are currently determined by Heap::collect_roots(). Anything that wants be collectable garbage should inherit from Cell, the fundamental atom of the GC heap. This is pretty neat! :^)
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namespace JS {
LibJS: Allow cells to mark null pointers This simplifies the cell visiting functions by letting them not worry about the pointers they pass to the visitor being null.
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void Cell::Visitor::visit(Cell* cell)
{
if (cell)
visit_impl(cell);
}
LibJS: Add a convenience helper for visiting a JS::Value We only really care to visit values if they refer to a Cell, but it's nice to be able to say visit(some_value).
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void Cell::Visitor::visit(Value value)
{
LibJS: Support "hello friends".length The above snippet is a MemberExpression that necessitates the implicit construction of a StringObject wrapper around a PrimitiveString. We then do a property lookup (a "get") on the StringObject, where we find the "length" property. This is pretty neat! :^)
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if (value.is_cell())
LibJS: Allow cells to mark null pointers This simplifies the cell visiting functions by letting them not worry about the pointers they pass to the visitor being null.
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visit_impl(value.as_cell());
LibJS: Add a convenience helper for visiting a JS::Value We only really care to visit values if they refer to a Cell, but it's nice to be able to say visit(some_value).
2020-03-09 18:14:51 -03:00
}
LibJS: Add a basic mark&sweep garbage collector :^) Objects can now be allocated via the interpreter's heap. Objects that are allocated in this way will need to be provably reachable from at least one of the known object graph roots. The roots are currently determined by Heap::collect_roots(). Anything that wants be collectable garbage should inherit from Cell, the fundamental atom of the GC heap. This is pretty neat! :^)
2020-03-08 15:23:58 -03:00
}
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