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https://github.com/RGBCube/serenity
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LibJS: Ensure get_new_target() never returns an empty value
Also add spec comments and remove a redundant exception check while we're here :^)
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4 changed files with 17 additions and 12 deletions
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@ -347,8 +347,6 @@ Value SuperCall::execute(Interpreter& interpreter, GlobalObject& global_object)
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// 1. Let newTarget be GetNewTarget().
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auto new_target = vm.get_new_target();
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if (vm.exception())
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return {};
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// 2. Assert: Type(newTarget) is Object.
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VERIFY(new_target.is_function());
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@ -2873,7 +2871,7 @@ Value MetaProperty::execute(Interpreter& interpreter, GlobalObject& global_objec
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InterpreterNodeScope node_scope { interpreter, *this };
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if (m_type == MetaProperty::Type::NewTarget)
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return interpreter.vm().get_new_target().value_or(js_undefined());
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return interpreter.vm().get_new_target();
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if (m_type == MetaProperty::Type::ImportMeta) {
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interpreter.vm().throw_exception<InternalError>(global_object, ErrorType::NotImplemented, "'import.meta' in modules");
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return {};
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@ -81,6 +81,8 @@ ThrowCompletionOr<Value> FunctionEnvironment::get_this_binding(GlobalObject& glo
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// 9.1.1.3.1 BindThisValue ( V ), https://tc39.es/ecma262/#sec-bindthisvalue
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ThrowCompletionOr<Value> FunctionEnvironment::bind_this_value(GlobalObject& global_object, Value this_value)
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{
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VERIFY(!this_value.is_empty());
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// 1. Assert: envRec.[[ThisBindingStatus]] is not lexical.
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VERIFY(m_this_binding_status != ThisBindingStatus::Lexical);
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@ -25,22 +25,22 @@ public:
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explicit FunctionEnvironment(Environment* parent_scope);
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virtual ~FunctionEnvironment() override;
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// [[ThisValue]]
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Value this_value() const { return m_this_value; }
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void set_this_value(Value value) { m_this_value = value; }
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// [[ThisBindingStatus]]
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ThisBindingStatus this_binding_status() const { return m_this_binding_status; }
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void set_this_binding_status(ThisBindingStatus status) { m_this_binding_status = status; }
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// [[FunctionObject]]
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ECMAScriptFunctionObject& function_object() { return *m_function_object; }
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ECMAScriptFunctionObject const& function_object() const { return *m_function_object; }
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void set_function_object(ECMAScriptFunctionObject& function) { m_function_object = &function; }
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// [[NewTarget]]
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Value new_target() const { return m_new_target; }
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void set_new_target(Value new_target) { m_new_target = new_target; }
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void set_new_target(Value new_target)
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{
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VERIFY(!new_target.is_empty());
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m_new_target = new_target;
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}
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// Abstract operations
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ThrowCompletionOr<Value> get_super_base() const;
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@ -53,10 +53,10 @@ private:
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virtual bool is_function_environment() const override { return true; }
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virtual void visit_edges(Visitor&) override;
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Value m_this_value;
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ThisBindingStatus m_this_binding_status { ThisBindingStatus::Uninitialized };
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ECMAScriptFunctionObject* m_function_object { nullptr };
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Value m_new_target;
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Value m_this_value; // [[ThisValue]]
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ThisBindingStatus m_this_binding_status { ThisBindingStatus::Uninitialized }; // [[ThisBindingStatus]]
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ECMAScriptFunctionObject* m_function_object { nullptr }; // [[FunctionObject]]
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Value m_new_target { js_undefined() }; // [[NewTarget]]
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};
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template<>
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@ -497,9 +497,14 @@ String VM::join_arguments(size_t start_index) const
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return joined_arguments.build();
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}
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// 9.4.5 GetNewTarget ( ), https://tc39.es/ecma262/#sec-getnewtarget
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Value VM::get_new_target()
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{
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// 1. Let envRec be GetThisEnvironment().
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auto& env = get_this_environment(*this);
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// 2. Assert: envRec has a [[NewTarget]] field.
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// 3. Return envRec.[[NewTarget]].
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return verify_cast<FunctionEnvironment>(env).new_target();
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}
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