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LibJS: Lookahead for a period when parsing new.target

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This allows us to skip saving and loading the state whenever we parse
'new'.
This commit is contained in:
davidot 2021-11-26 23:41:59 +01:00 • committed by Linus Groh
parent 4d7e79fb72
commit 73eb29dabe
1 changed files with 5 additions and 3 deletions
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8
Userland/Libraries/LibJS/Parser.cpp
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@ -851,6 +851,10 @@ RefPtr<Statement> Parser::try_parse_labelled_statement(AllowLabelledFunction all
RefPtr<MetaProperty> Parser::try_parse_new_target_expression() RefPtr<MetaProperty> Parser::try_parse_new_target_expression()
{ {
// Optimization which skips the save/load state.
if (next_token().type() != TokenType::Period)
return {};
save_state(); save_state();
auto rule_start = push_start(); auto rule_start = push_start();
ArmedScopeGuard state_rollback_guard = [&] { ArmedScopeGuard state_rollback_guard = [&] {
@ -858,9 +862,7 @@ RefPtr<MetaProperty> Parser::try_parse_new_target_expression()
}; };
consume(TokenType::New); consume(TokenType::New);
if (!match(TokenType::Period)) consume(TokenType::Period);
return {};
consume();
if (!match(TokenType::Identifier)) if (!match(TokenType::Identifier))
return {}; return {};
// The string 'target' cannot have escapes so we check original value. // The string 'target' cannot have escapes so we check original value.