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LibJS: Add a number-indexed property storage to all Objects

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Objects can have both named and indexed properties. Previously we kept
all property names as strings. This patch separates named and indexed
properties and splits them between Object::m_storage and m_elements.

This allows us to do much faster array-style access using numeric
indices. It also makes the Array class much less special, since all
Objects now have number-indexed storage. :^)
This commit is contained in:
Andreas Kling 2020-04-06 16:53:02 +02:00
parent 65dd9d5ad3
commit 90ba0145f6
6 changed files with 69 additions and 50 deletions
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8
Libraries/LibJS/Runtime/ObjectConstructor.cpp
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@ -64,11 +64,9 @@ Value ObjectConstructor::get_own_property_names(Interpreter& interpreter)
if (interpreter.exception())
return {};
auto* result = interpreter.heap().allocate<Array>();
if (object->is_array()) {
auto* array = static_cast<const Array*>(object);
for (i32 i = 0; i < array->length(); ++i)
result->push(js_string(interpreter, String::number(i)));
}
for (size_t i = 0; i < object->elements().size(); ++i)
result->push(js_string(interpreter, String::number(i)));
for (auto& it : object->shape().property_table())
result->push(js_string(interpreter, it.key));
return result;