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LibJS/Bytecode: Implement break/continue labels

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This is done by keeping track of all the labels that apply to a given
break/continue scope alongside their bytecode target. When a
break/continue with a label is generated, we scan from the most inner
scope to the most outer scope looking for the label, performing any
necessary unwinds on the way. Once the label is found, it is then
jumped to.
This commit is contained in:
Luke Wilde 2022-06-11 23:09:37 +01:00 • committed by Ali Mohammad Pur
parent 455c0b7794
commit c0fadfb9b7
4 changed files with 218 additions and 30 deletions
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9
Userland/Libraries/LibJS/AST.h
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@ -113,6 +113,8 @@ public:
virtual Completion execute(Interpreter&, GlobalObject&) const override;
virtual void dump(int indent) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_bytecode(Bytecode::Generator&) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_labelled_evaluation(Bytecode::Generator&, Vector<FlyString> const&) const;
FlyString const& label() const { return m_label; }
FlyString& label() { return m_label; }
@ -142,6 +144,7 @@ public:
using Statement::Statement;
virtual Completion loop_evaluation(Interpreter&, GlobalObject&, Vector<FlyString> const&) const = 0;
virtual Bytecode::CodeGenerationErrorOr<void> generate_labelled_evaluation(Bytecode::Generator&, Vector<FlyString> const&) const;
private:
virtual bool is_iteration_statement() const final { return true; }
@ -803,6 +806,7 @@ public:
virtual Completion loop_evaluation(Interpreter&, GlobalObject&, Vector<FlyString> const&) const override;
virtual void dump(int indent) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_bytecode(Bytecode::Generator&) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_labelled_evaluation(Bytecode::Generator&, Vector<FlyString> const&) const override;
private:
NonnullRefPtr<Expression> m_test;
@ -825,6 +829,7 @@ public:
virtual Completion loop_evaluation(Interpreter&, GlobalObject&, Vector<FlyString> const&) const override;
virtual void dump(int indent) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_bytecode(Bytecode::Generator&) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_labelled_evaluation(Bytecode::Generator&, Vector<FlyString> const&) const override;
private:
NonnullRefPtr<Expression> m_test;
@ -872,6 +877,7 @@ public:
virtual Completion loop_evaluation(Interpreter&, GlobalObject&, Vector<FlyString> const&) const override;
virtual void dump(int indent) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_bytecode(Bytecode::Generator&) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_labelled_evaluation(Bytecode::Generator&, Vector<FlyString> const&) const override;
private:
RefPtr<ASTNode> m_init;
@ -896,6 +902,7 @@ public:
virtual Completion execute(Interpreter&, GlobalObject&) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_bytecode(Bytecode::Generator&) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_labelled_evaluation(Bytecode::Generator&, Vector<FlyString> const&) const override;
virtual Completion loop_evaluation(Interpreter&, GlobalObject&, Vector<FlyString> const&) const override;
virtual void dump(int indent) const override;
@ -921,6 +928,7 @@ public:
virtual Completion execute(Interpreter&, GlobalObject&) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_bytecode(Bytecode::Generator&) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_labelled_evaluation(Bytecode::Generator&, Vector<FlyString> const&) const override;
virtual Completion loop_evaluation(Interpreter&, GlobalObject&, Vector<FlyString> const&) const override;
virtual void dump(int indent) const override;
@ -2002,6 +2010,7 @@ public:
virtual void dump(int indent) const override;
virtual Completion execute(Interpreter&, GlobalObject&) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_bytecode(Bytecode::Generator&) const override;
virtual Bytecode::CodeGenerationErrorOr<void> generate_labelled_evaluation(Bytecode::Generator&, Vector<FlyString> const&) const;
Completion execute_impl(Interpreter&, GlobalObject&) const;
void add_case(NonnullRefPtr<SwitchCase> switch_case) { m_cases.append(move(switch_case)); }