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LibJS: Replace the custom unwind mechanism with completions :^)

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This includes:

- Parsing proper LabelledStatements with try_parse_labelled_statement()
- Removing LabelableStatement
- Implementing the LoopEvaluation semantics via loop_evaluation() in
  each IterationStatement subclass; and IterationStatement evaluation
  via {For,ForIn,ForOf,ForAwaitOf,While,DoWhile}Statement::execute()
- Updating ReturnStatement, BreakStatement and ContinueStatement to
  return the appropriate completion types
- Basically reimplementing TryStatement and SwitchStatement according to
  the spec, using completions
- Honoring result completion types in AsyncBlockStart and
  OrdinaryCallEvaluateBody
- Removing any uses of the VM unwind mechanism - most importantly,
  VM::throw_exception() now exclusively sets an exception and no longer
  triggers any unwinding mechanism.
  However, we already did a good job updating all of LibWeb and userland
  applications to not use it, and the few remaining uses elsewhere don't
  rely on unwinding AFAICT.
This commit is contained in:
Linus Groh 2022-01-05 19:11:16 +01:00
parent eed764e1dd
commit 9d0d3affd4
16 changed files with 512 additions and 279 deletions
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22
Userland/Libraries/LibJS/AST.h
View file

@ -120,9 +120,11 @@ protected:
Vector<FlyString> m_labels;
};
class IterationStatement : public LabelableStatement {
class IterationStatement : public Statement {
public:
using LabelableStatement::LabelableStatement;
using Statement::Statement;
virtual Completion loop_evaluation(Interpreter&, GlobalObject&, Vector<FlyString> const&) const = 0;
};
class EmptyStatement final : public Statement {
@ -183,7 +185,7 @@ public:
}
};
class ScopeNode : public LabelableStatement {
class ScopeNode : public Statement {
public:
template<typename T, typename... Args>
T& append(SourceRange range, Args&&... args)
@ -227,7 +229,7 @@ public:
protected:
explicit ScopeNode(SourceRange source_range)
: LabelableStatement(source_range)
: Statement(source_range)
{
}
@ -681,6 +683,7 @@ public:
Statement const& body() const { return *m_body; }
virtual Completion execute(Interpreter&, GlobalObject&) const override;
virtual Completion loop_evaluation(Interpreter&, GlobalObject&, Vector<FlyString> const&) const override;
virtual void dump(int indent) const override;
virtual void generate_bytecode(Bytecode::Generator&) const override;
@ -702,6 +705,7 @@ public:
Statement const& body() const { return *m_body; }
virtual Completion execute(Interpreter&, GlobalObject&) const override;
virtual Completion loop_evaluation(Interpreter&, GlobalObject&, Vector<FlyString> const&) const override;
virtual void dump(int indent) const override;
virtual void generate_bytecode(Bytecode::Generator&) const override;
@ -747,6 +751,7 @@ public:
Statement const& body() const { return *m_body; }
virtual Completion execute(Interpreter&, GlobalObject&) const override;
virtual Completion loop_evaluation(Interpreter&, GlobalObject&, Vector<FlyString> const&) const override;
virtual void dump(int indent) const override;
virtual void generate_bytecode(Bytecode::Generator&) const override;
@ -772,6 +777,7 @@ public:
Statement const& body() const { return *m_body; }
virtual Completion execute(Interpreter&, GlobalObject&) const override;
virtual Completion loop_evaluation(Interpreter&, GlobalObject&, Vector<FlyString> const&) const override;
virtual void dump(int indent) const override;
private:
@ -795,6 +801,7 @@ public:
Statement const& body() const { return *m_body; }
virtual Completion execute(Interpreter&, GlobalObject&) const override;
virtual Completion loop_evaluation(Interpreter&, GlobalObject&, Vector<FlyString> const&) const override;
virtual void dump(int indent) const override;
private:
@ -814,6 +821,7 @@ public:
}
virtual Completion execute(Interpreter&, GlobalObject&) const override;
virtual Completion loop_evaluation(Interpreter&, GlobalObject&, Vector<FlyString> const&) const override;
virtual void dump(int indent) const override;
private:
@ -1786,10 +1794,10 @@ private:
NonnullRefPtr<BlockStatement> m_body;
};
class TryStatement final : public LabelableStatement {
class TryStatement final : public Statement {
public:
TryStatement(SourceRange source_range, NonnullRefPtr<BlockStatement> block, RefPtr<CatchClause> handler, RefPtr<BlockStatement> finalizer)
: LabelableStatement(source_range)
: Statement(source_range)
, m_block(move(block))
, m_handler(move(handler))
, m_finalizer(move(finalizer))
@ -1803,7 +1811,6 @@ public:
virtual void dump(int indent) const override;
virtual Completion execute(Interpreter&, GlobalObject&) const override;
virtual void generate_bytecode(Bytecode::Generator&) const override;
void add_label(FlyString string) override;
private:
NonnullRefPtr<BlockStatement> m_block;
@ -1858,6 +1865,7 @@ public:
virtual Completion execute(Interpreter&, GlobalObject&) const override;
virtual void generate_bytecode(Bytecode::Generator&) const override;
Completion execute_impl(Interpreter&, GlobalObject&) const;
void add_case(NonnullRefPtr<SwitchCase> switch_case) { m_cases.append(move(switch_case)); }
private: