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LibJS/Bytecode: Don't reparse regular expressions on instantiation

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The RegExpLiteral AST node already has the parsed regex::Parser::Result
so let's plumb that over to the bytecode executable instead of reparsing
the regex every time NewRegExp is executed.

~12% speed-up on language/literals/regexp/S7.8.5_A2.1_T2.js in test262.
This commit is contained in:
Andreas Kling
2023-07-13 10:49:07 +02:00
parent a098f38cab
commit c0f985ffcf
9 changed files with 109 additions and 4 deletions
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7
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@@ -289,7 +289,12 @@ Bytecode::CodeGenerationErrorOr<void> RegExpLiteral::generate_bytecode(Bytecode:
{
auto source_index = generator.intern_string(m_pattern);
auto flags_index = generator.intern_string(m_flags);
generator.emit<Bytecode::Op::NewRegExp>(source_index, flags_index);
auto regex_index = generator.intern_regex(Bytecode::ParsedRegex {
.regex = m_parsed_regex,
.pattern = m_parsed_pattern,
.flags = m_parsed_flags,
});
generator.emit<Bytecode::Op::NewRegExp>(source_index, flags_index, regex_index);
return {};
}