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LibJS: Convert Object bitfields to a flags byte

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Replace individual bool bitfields in Object (m_is_extensible,
m_has_parameter_map, m_has_magical_length_property, etc.) with a
single u8 m_flags field and Flag:: constants.

This consolidates 8 scattered bitfields into one byte with explicit
bit positions, making them easy to access from generated assembly
code at a known offset. It also converts the virtual is_function()
and is_ecmascript_function_object() methods to flag-based checks,
avoiding virtual dispatch for these hot queries.

ProxyObject now explicitly clears the IsFunction flag in its
constructor when wrapping a non-callable target, instead of relying
on a virtual is_function() override.
This commit is contained in:
Andreas Kling
2026-03-06 22:05:13 +01:00
committed by Andreas Kling
parent 643f2884cc
commit c5427e5f4e
Notes: github-actions[bot] 2026-03-07 12:12:35 +00:00 
Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/c5427e5f4e1
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8299
10 changed files with 68 additions and 47 deletions
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4
Libraries/LibJS/Runtime/ProxyObject.cpp
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@@ -46,6 +46,10 @@ ProxyObject::ProxyObject(Object& target, Object& handler, Object& prototype)
, m_target(target)
, m_handler(handler)
{
// A Proxy is callable iff its target is callable.
if (!target.is_function())
clear_is_function();
if (target.is_array_exotic_object()) {
auto& array = static_cast<Array&>(target);
array.set_is_proxy_target(true);