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LibJS: Memoize failed calls of try_parse_arrow_function_expression()

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Stephan Unverwerth 2021-04-11 22:41:51 +02:00 • committed by Andreas Kling
parent 435bd841ee
commit 8c80eb8870
2 changed files with 46 additions and 4 deletions
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21
Userland/Libraries/LibJS/Parser.h
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@ -147,6 +147,10 @@ public:
}
}
struct TokenMemoization {
bool try_parse_arrow_function_expression_failed;
};
private:
friend class ScopePusher;
@ -172,6 +176,9 @@ private:
void discard_saved_state();
Position position() const;
bool try_parse_arrow_function_expression_failed_at_position(const Position&) const;
void set_try_parse_arrow_function_expression_failed_at_position(const Position&, bool);
struct RulePosition {
AK_MAKE_NONCOPYABLE(RulePosition);
AK_MAKE_NONMOVABLE(RulePosition);
@ -220,9 +227,23 @@ private:
explicit ParserState(Lexer);
};
class PositionKeyTraits {
public:
static int hash(const Position& position)
{
return int_hash(position.line) ^ int_hash(position.column);
}
static bool equals(const Position& a, const Position& b)
{
return a.column == b.column && a.line == b.line;
}
};
Vector<Position> m_rule_starts;
ParserState m_parser_state;
FlyString m_filename;
Vector<ParserState> m_saved_state;
HashMap<Position, TokenMemoization, PositionKeyTraits> m_token_memoizations;
};
}