Andreas Kling fa6c06ce8d LibJS: Elide some declarative environments in ECMAScript function calls ...

By spec, calling an ECMAScript function object in non-strict mode should
always create a new top-level declarative environment, even if there are
no lexically scoped bindings (let/const) that belong in it. This is
used for scope disambiguation in direct eval() calls.

However, if there are no direct eval() calls within the function, and no
lexically scoped bindings, we can simply not allocate the extra
environment and save ourselves the trouble.

2021-10-08 15:00:34 +02:00

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