This is much more common across the whole codebase and even these two
files. The same is used to return an empty JS::Value in an exception
check, for example.
'bindings' is the spec-compliant version of 'variables', but we were
simply not even looking at them, which made things using bindings (such
as named function expressions) break in unexpected ways after the move
to using references in call expressions.
Co-Authored-By: davidot <david.tuin@gmail.com>
The save/load of parser state performed by lookahead parsing is quite
expensive so let's try to avoid it in the most common case.
This is a 15-20% speedup on various chunks of JS I've tested. :^)
Before this change, Lexer::is_identifier_{start,middle}() would do a
Unicode property lookup via Unicode::code_point_has_property() quite
frequently, especially for common characters like .,;{}[]() etc.
Since these and any other ASCII characters not covered by the alpha /
alphanumeric check are known to not have the ID_Start / ID_Continue
(except '_', which is special-cased now) properties, we can easily
avoid this function call.
In the spec, this happens in the EvaluateCall abstract operation
(https://tc39.es/ecma262/#sec-evaluatecall), and the order is defined
as:
3. Let argList be ? ArgumentListEvaluation of arguments.
4. If Type(func) is not Object, throw a TypeError exception.
5. If IsCallable(func) is false, throw a TypeError exception.
In LibJS this is handled by CallExpression::execute(), which had the
callee function check first and would therefore never evaluate the
arguments for a non-function callee.
...instead of relying on the VM having a current execution context. This
was an incorrect assumption I made, and it caused onfoo attribute
handler construction in LibWeb to crash.
Just use the same mechanism as NativeFunction in the meantime.
There's currently a fallback at the call site where the Realm is needed
(due to a slightly incorrect implementation of [[Call]] / [[Construct]])
so this is better than crashing (in LibWeb, currently).
We need both a GlobalObject and Realm now, but can get the former from
the latter (once initialized).
This also fixes JS execution in LibWeb, as we failed to set the Realm of
the newly created Interpreter in this function.
This method represents the Intl.NumberFormat's [[RelevantExtensionKeys]]
internal slot, so it makes more sense for this to be directly in the
class itself.
To be consistent with the style in Temporal, let's move all AOs in Intl
to their object file, rather than splitting the AOs between prototype
and constructor files.
Intl.DisplayNames was the first Intl object implemented, and at that
point all AOs were just put into the main Intl AO header. But AOs that
belong to specific objects belong in that object's header. So this moves
CanonicalCodeForDisplayNames to the Intl.DisplayNames header.
