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LibJS+LibWeb: Replace StringOrSymbol usage with PropertyKey
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Browse source 
- Avoids unnecessary conversions between StringOrSymbol and PropertyKey
  on the hot path of property access.
- Simplifies the code by removing StringOrSymbol and using PropertyKey
  directly. There was no reason to have a separate StringOrSymbol type
  representing the same data as PropertyKey, just with the index key
  stored as a string.

PropertyKey has been updated to use a tagged pointer instead of a
Variant, so it still occupies 8 bytes, same as StringOrSymbol.

12% improvement on JetStream/gcc-loops.cpp.js
12% improvement on MicroBench/object-assign.js
7% improvement on MicroBench/object-keys.js
This commit is contained in:
Aliaksandr Kalenik 2025-05-15 17:14:00 +03:00 • committed by Alexander Kalenik
parent 5495531118
commit b559965448
Notes: github-actions[bot] 2025-05-17 14:09:31 +00:00
12 changed files with 195 additions and 275 deletions
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2
Libraries/LibJS/MarkupGenerator.cpp
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@ -124,7 +124,7 @@ ErrorOr<void> MarkupGenerator::object_to_html(Object const& object, StringBuilde
size_t index = 0;
for (auto& it : object.shape().property_table()) {
TRY(html_output.try_append(TRY(wrap_string_in_style(TRY(String::formatted("\"{}\"", escape_html_entities(it.key.to_display_string()))), StyleType::String))));
TRY(html_output.try_append(TRY(wrap_string_in_style(TRY(String::formatted("\"{}\"", escape_html_entities(it.key.to_string()))), StyleType::String))));
TRY(html_output.try_append(TRY(wrap_string_in_style(": "sv, StyleType::Punctuation))));
TRY(value_to_html(object.get_direct(it.value.offset), html_output, seen_objects));
if (index != object.shape().property_count() - 1)