IDL compiler: [ReflectMissing], [ReflectInvalid]

Source/bindings/templates/attributes.cpp

 {##############################################################################}
 {% macro attribute_getter(attribute, world_suffix) %}
 {% filter conditional(attribute.conditional_string) %}
 static void {{attribute.name}}AttributeGetter{{world_suffix}}(
 {%- if attribute.is_expose_js_accessors %}
 const v8::FunctionCallbackInfo<v8::Value>& info
 {%- else %}
 const v8::PropertyCallbackInfo<v8::Value>& info
 {%- endif %})
 {
@@ skipping 16 matching lines @@
         if (!jsValue.IsEmpty()) {
             v8SetReturnValue(info, jsValue);
             return;
         }
     }
     {% elif not (attribute.is_static or attribute.is_unforgeable) %}
     {{cpp_class}}* imp = {{v8_class}}::toNative(info.Holder());
     {% endif %}
     {% if attribute.reflect_only %}
     {{attribute.cpp_type}} {{attribute.cpp_value}} = {{attribute.cpp_value_original}};
-    {{release_only_check(attribute.reflect_only) | indent}}
+    {{release_only_check(attribute.reflect_only, attribute.reflect_missing,
+                         attribute.reflect_invalid) | indent}}
     {% endif %}
     {% if attribute.is_call_with_execution_context %}
     ExecutionContext* scriptContext = currentExecutionContext(info.GetIsolate());
     {% endif %}
     {# Special cases #}
     {% if attribute.is_check_security_for_node or
           attribute.is_getter_raises_exception %}
     ExceptionState exceptionState(ExceptionState::GetterContext, "{{attribute.name}}", "{{interface_name}}", info.Holder(), info.GetIsolate());
     {% endif %}
     {% if attribute.is_check_security_for_node %}
@@ skipping 40 matching lines @@
     {{attribute.v8_set_return_value_for_main_world}};
     {% else %}
     {{attribute.v8_set_return_value}};
     {% endif %}
     {% endif %}
 }
 {% endfilter %}
 {% endmacro %}
 
 {######################################}
-{% macro release_only_check(reflect_only_values) %}
+{% macro release_only_check(reflect_only_values, reflect_missing,
+                            reflect_invalid) %}
 {# Attribute is limited to only known values: check that the attribute value is
    one of those. If not, set it to the empty string.
    http://www.whatwg.org/specs/web-apps/current-work/#limited-to-only-known-values #}
 if (resultValue.isEmpty()) {
+{% if reflect_missing %}
+    resultValue = "{{reflect_missing}}";
+{% else %}
     ;
+{% endif %}
 {% for value in reflect_only_values %}
 } else if (equalIgnoringCase(resultValue, "{{value}}")) {
     resultValue = "{{value}}";
 {% endfor %}
 } else {
-    resultValue = "";
+    resultValue = "{{reflect_invalid}}";
 }
 {% endmacro %}
 
 
 {##############################################################################}
 {% macro attribute_getter_callback(attribute, world_suffix) %}
 {% filter conditional(attribute.conditional_string) %}
 static void {{attribute.name}}AttributeGetterCallback{{world_suffix}}(
 {%- if attribute.is_expose_js_accessors %}
 const v8::FunctionCallbackInfo<v8::Value>& info
@@ skipping 129 matching lines @@
     {% endif %}
     {% if attribute.has_custom_setter %}
     {{v8_class}}::{{attribute.name}}AttributeSetterCustom(jsValue, info);
     {% else %}
     {{cpp_class}}V8Internal::{{attribute.name}}AttributeSetter{{world_suffix}}(jsValue, info);
     {% endif %}
     TRACE_EVENT_SET_SAMPLING_STATE("V8", "V8Execution");
 }
 {% endfilter %}
 {% endmacro %}