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LibJS: Implement basic support for the "delete" operator

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It turns out "delete" is actually a unary op :)
This patch implements deletion of object properties, it doesn't yet
work for casually deleting properties from the global object.

When deleting a property from an object, we switch that object to
having a unique shape, no longer sharing shapes with others.
Once an object has a unique shape, it no longer needs to care about
shape transitions.
This commit is contained in:
Andreas Kling 2020-04-26 13:53:40 +02:00
parent 1617be1e6f
commit f897c41092
9 changed files with 190 additions and 8 deletions
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3
Libraries/LibJS/Runtime/ObjectConstructor.cpp
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@ -75,8 +75,9 @@ Value ObjectConstructor::get_own_property_names(Interpreter& interpreter)
result->elements().append(js_string(interpreter, String::number(i)));
}
for (auto& it : object->shape().property_table())
for (auto& it : object->shape().property_table()) {
result->elements().append(js_string(interpreter, it.key));
}
return result;
}