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LibJS: Reduce copying of string data in String.prototype

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The primary themes here are invoking js_string() with existing instances
of Utf16String when possible, and not creating entire UTF-8 copies when
not needed.
This commit is contained in:
Timothy Flynn 2021-08-09 12:38:38 -04:00 • committed by Andreas Kling
parent daf559c717
commit 6c45620709
2 changed files with 75 additions and 120 deletions
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6
Userland/Libraries/LibJS/Runtime/AbstractOperations.cpp
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@ -595,17 +595,17 @@ String get_substitution(GlobalObject& global_object, Utf16View const& matched, U
result.append('$');
++i;
} else if (next == '&') {
result.append(matched.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes));
result.append(matched);
++i;
} else if (next == '`') {
auto substring = str.substring_view(0, position);
result.append(substring.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes));
result.append(substring);
++i;
} else if (next == '\'') {
auto tail_pos = position + matched.length_in_code_units();
if (tail_pos < str.length_in_code_units()) {
auto substring = str.substring_view(tail_pos);
result.append(substring.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes));
result.append(substring);
}
++i;
} else if (is_ascii_digit(next)) {