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LibJS: Initial class implementation; allow super expressions in object

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literal methods; add EnvrionmentRecord fields and methods to
LexicalEnvironment

Adding EnvrionmentRecord's fields and methods lets us throw an exception
when |this| is not initialized, which occurs when the super constructor
in a derived class has not yet been called, or when |this| has already
been initialized (the super constructor was already called).
This commit is contained in:
Jack Karamanian 2020-06-08 13:31:21 -05:00 • committed by Andreas Kling
parent a535d58cac
commit 7533fd8b02
18 changed files with 967 additions and 92 deletions
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43
Libraries/LibJS/Runtime/LexicalEnvironment.h
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@ -40,11 +40,27 @@ struct Variable {
class LexicalEnvironment final : public Cell {
public:
enum class ThisBindingStatus {
Lexical,
Initialized,
Uninitialized,
};
enum class EnvironmentRecordType {
Declarative,
Function,
Global,
Object,
Module,
};
LexicalEnvironment();
LexicalEnvironment(EnvironmentRecordType);
LexicalEnvironment(HashMap<FlyString, Variable> variables, LexicalEnvironment* parent);
LexicalEnvironment(HashMap<FlyString, Variable> variables, LexicalEnvironment* parent, EnvironmentRecordType);
virtual ~LexicalEnvironment() override;
LexicalEnvironment* parent() { return m_parent; }
LexicalEnvironment* parent() const { return m_parent; }
Optional<Variable> get(const FlyString&) const;
void set(const FlyString&, Variable);
@ -53,12 +69,37 @@ public:
const HashMap<FlyString, Variable>& variables() const { return m_variables; }
void set_home_object(Value object) { m_home_object = object; }
bool has_super_binding() const;
Value get_super_base();
bool has_this_binding() const;
ThisBindingStatus this_binding_status() const { return m_this_binding_status; }
Value get_this_binding() const;
void bind_this_value(Value this_value);
// Not a standard operation.
void replace_this_binding(Value this_value) { m_this_value = this_value; }
Value new_target() const { return m_new_target; };
void set_new_target(Value new_target) { m_new_target = new_target; }
Function* current_function() const { return m_current_function; }
void set_current_function(Function& function) { m_current_function = &function; }
private:
virtual const char* class_name() const override { return "LexicalEnvironment"; }
virtual void visit_children(Visitor&) override;
LexicalEnvironment* m_parent { nullptr };
HashMap<FlyString, Variable> m_variables;
EnvironmentRecordType m_environment_record_type = EnvironmentRecordType::Declarative;
ThisBindingStatus m_this_binding_status = ThisBindingStatus::Uninitialized;
Value m_home_object;
Value m_this_value;
Value m_new_target;
// Corresponds to [[FunctionObject]]
Function* m_current_function { nullptr };
};
}