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Code Issues Projects Releases Packages Wiki Activity Actions 9

LibJS: Don't use null DFS for break/continue statements without a label

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Dan Klishch 2024-01-24 13:32:02 -05:00 • committed by Andrew Kaster
parent 761d16141d
commit 78491204d9
Notes: sideshowbarker 2024-07-17 03:14:39 +09:00
3 changed files with 17 additions and 17 deletions
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12
Userland/Libraries/LibJS/AST.h
View file

@ -2118,22 +2118,22 @@ private:
class BreakStatement final : public Statement { class BreakStatement final : public Statement {
public: public:
BreakStatement(SourceRange source_range, DeprecatedFlyString target_label) BreakStatement(SourceRange source_range, Optional<DeprecatedFlyString> target_label)
: Statement(move(source_range)) : Statement(move(source_range))
, m_target_label(move(target_label)) , m_target_label(move(target_label))
{ {
} }
DeprecatedFlyString const& target_label() const { return m_target_label; } Optional<DeprecatedFlyString> const& target_label() const { return m_target_label; }
virtual Bytecode::CodeGenerationErrorOr<Optional<Bytecode::Operand>> generate_bytecode(Bytecode::Generator&, Optional<Bytecode::Operand> preferred_dst = {}) const override; virtual Bytecode::CodeGenerationErrorOr<Optional<Bytecode::Operand>> generate_bytecode(Bytecode::Generator&, Optional<Bytecode::Operand> preferred_dst = {}) const override;
private: private:
DeprecatedFlyString m_target_label; Optional<DeprecatedFlyString> m_target_label;
}; };
class ContinueStatement final : public Statement { class ContinueStatement final : public Statement {
public: public:
ContinueStatement(SourceRange source_range, DeprecatedFlyString target_label) ContinueStatement(SourceRange source_range, Optional<DeprecatedFlyString> target_label)
: Statement(move(source_range)) : Statement(move(source_range))
, m_target_label(move(target_label)) , m_target_label(move(target_label))
{ {
@ -2141,10 +2141,10 @@ public:
virtual Bytecode::CodeGenerationErrorOr<Optional<Bytecode::Operand>> generate_bytecode(Bytecode::Generator&, Optional<Bytecode::Operand> preferred_dst = {}) const override; virtual Bytecode::CodeGenerationErrorOr<Optional<Bytecode::Operand>> generate_bytecode(Bytecode::Generator&, Optional<Bytecode::Operand> preferred_dst = {}) const override;
DeprecatedFlyString const& target_label() const { return m_target_label; } Optional<DeprecatedFlyString> const& target_label() const { return m_target_label; }
private: private:
DeprecatedFlyString m_target_label; Optional<DeprecatedFlyString> m_target_label;
}; };
class DebuggerStatement final : public Statement { class DebuggerStatement final : public Statement {

8
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
View file

@ -2199,12 +2199,12 @@ Bytecode::CodeGenerationErrorOr<Optional<Bytecode::Operand>> ContinueStatement::
// FIXME: Handle finally blocks in a graceful manner // FIXME: Handle finally blocks in a graceful manner
// We need to execute the finally block, but tell it to resume // We need to execute the finally block, but tell it to resume
// execution at the designated block // execution at the designated block
if (m_target_label.is_null()) { if (!m_target_label.has_value()) {
generator.generate_continue(); generator.generate_continue();
return Optional<Bytecode::Operand> {}; return Optional<Bytecode::Operand> {};
} }
generator.generate_continue(m_target_label); generator.generate_continue(m_target_label.value());
return Optional<Bytecode::Operand> {}; return Optional<Bytecode::Operand> {};
} }
@ -2415,12 +2415,12 @@ Bytecode::CodeGenerationErrorOr<Optional<Bytecode::Operand>> BreakStatement::gen
// FIXME: Handle finally blocks in a graceful manner // FIXME: Handle finally blocks in a graceful manner
// We need to execute the finally block, but tell it to resume // We need to execute the finally block, but tell it to resume
// execution at the designated block // execution at the designated block
if (m_target_label.is_null()) { if (!m_target_label.has_value()) {
generator.generate_break(); generator.generate_break();
return Optional<Bytecode::Operand> {}; return Optional<Bytecode::Operand> {};
} }
generator.generate_break(m_target_label); generator.generate_break(m_target_label.value());
return Optional<Bytecode::Operand> {}; return Optional<Bytecode::Operand> {};
} }

14
Userland/Libraries/LibJS/Parser.cpp
View file

@ -3397,21 +3397,21 @@ NonnullRefPtr<BreakStatement const> Parser::parse_break_statement()
{ {
auto rule_start = push_start(); auto rule_start = push_start();
consume(TokenType::Break); consume(TokenType::Break);
DeprecatedFlyString target_label; Optional<DeprecatedFlyString> target_label;
if (match(TokenType::Semicolon)) { if (match(TokenType::Semicolon)) {
consume(); consume();
} else { } else {
if (!m_state.current_token.trivia_contains_line_terminator() && match_identifier()) { if (!m_state.current_token.trivia_contains_line_terminator() && match_identifier()) {
target_label = consume().value(); target_label = consume().value();
auto label = m_state.labels_in_scope.find(target_label); auto label = m_state.labels_in_scope.find(target_label.value());
if (label == m_state.labels_in_scope.end()) if (label == m_state.labels_in_scope.end())
syntax_error(ByteString::formatted("Label '{}' not found", target_label)); syntax_error(ByteString::formatted("Label '{}' not found", target_label.value()));
} }
consume_or_insert_semicolon(); consume_or_insert_semicolon();
} }
if (target_label.is_null() && !m_state.in_break_context) if (!target_label.has_value() && !m_state.in_break_context)
syntax_error("Unlabeled 'break' not allowed outside of a loop or switch statement"); syntax_error("Unlabeled 'break' not allowed outside of a loop or switch statement");
return create_ast_node<BreakStatement>({ m_source_code, rule_start.position(), position() }, target_label); return create_ast_node<BreakStatement>({ m_source_code, rule_start.position(), position() }, target_label);
@ -3424,7 +3424,7 @@ NonnullRefPtr<ContinueStatement const> Parser::parse_continue_statement()
syntax_error("'continue' not allow outside of a loop"); syntax_error("'continue' not allow outside of a loop");
consume(TokenType::Continue); consume(TokenType::Continue);
DeprecatedFlyString target_label; Optional<DeprecatedFlyString> target_label;
if (match(TokenType::Semicolon)) { if (match(TokenType::Semicolon)) {
consume(); consume();
return create_ast_node<ContinueStatement>({ m_source_code, rule_start.position(), position() }, target_label); return create_ast_node<ContinueStatement>({ m_source_code, rule_start.position(), position() }, target_label);
@ -3433,9 +3433,9 @@ NonnullRefPtr<ContinueStatement const> Parser::parse_continue_statement()
auto label_position = position(); auto label_position = position();
target_label = consume().value(); target_label = consume().value();
auto label = m_state.labels_in_scope.find(target_label); auto label = m_state.labels_in_scope.find(target_label.value());
if (label == m_state.labels_in_scope.end()) if (label == m_state.labels_in_scope.end())
syntax_error(ByteString::formatted("Label '{}' not found or invalid", target_label)); syntax_error(ByteString::formatted("Label '{}' not found or invalid", target_label.value()));
else else
label->value = label_position; label->value = label_position;
} }