binding: Retires ExceptionState::throwIfNeeded().

third_party/WebKit/Source/bindings/templates/attributes.cpp

 {% from 'utilities.cpp' import declare_enum_validation_variable, v8_value_to_local_cpp_value %}
 
 {##############################################################################}
 {% macro attribute_getter(attribute, world_suffix) %}
 static void {{attribute.name}}AttributeGetter{{world_suffix}}(
 {%- if attribute.is_data_type_property %}
 const v8::PropertyCallbackInfo<v8::Value>& info
 {%- else %}
 const v8::FunctionCallbackInfo<v8::Value>& info
 {%- endif %})
@@ skipping 59 matching lines @@
     {% endif %}
     {% if attribute.is_implemented_in_private_script %}
     {{attribute.cpp_type}} result{{attribute.cpp_type_initializer}};
     if (!{{attribute.cpp_value_original}})
         return;
     {% elif attribute.cpp_value_original %}
     {{attribute.cpp_type}} {{attribute.cpp_value}}({{attribute.cpp_value_original}});
     {% endif %}
     {# Checks #}
     {% if attribute.is_getter_raises_exception %}
-    if (UNLIKELY(exceptionState.throwIfNeeded()))
+    if (UNLIKELY(exceptionState.hadException()))
         return;
     {% endif %}
     {# Security checks #}
     {% if not attribute.is_data_type_property %}
     {% if attribute.is_check_security_for_receiver %}
     if (!BindingSecurity::shouldAllowAccessTo(currentDOMWindow(info.GetIsolate()), impl, exceptionState)) {
         v8SetReturnValueNull(info);
-        exceptionState.throwIfNeeded();
         return;
     }
     {% endif %}
     {% endif %}
     {% if attribute.is_check_security_for_return_value %}
     if (!BindingSecurity::shouldAllowAccessTo(currentDOMWindow(info.GetIsolate()), {{attribute.cpp_value}}, exceptionState)) {
         v8SetReturnValueNull(info);
-        exceptionState.throwIfNeeded();
         return;
     }
     {% endif %}
     {% if attribute.reflect_only %}
     {{release_only_check(attribute.reflect_only, attribute.reflect_missing,
                          attribute.reflect_invalid, attribute.reflect_empty,
                          attribute.cpp_value)
       | indent}}
     {% endif %}
     {% if attribute.is_explicit_nullable %}
@@ skipping 165 matching lines @@
             not attribute.constructor_type %}
     {{cpp_class}}* impl = {{v8_class}}::toImpl(holder);
     {% endif %}
     {# Security checks #}
     {% if not attribute.is_replaceable and
           not attribute.constructor_type %}
     {% if not attribute.is_data_type_property %}
     {% if attribute.is_check_security_for_receiver %}
     if (!BindingSecurity::shouldAllowAccessTo(currentDOMWindow(info.GetIsolate()), impl, exceptionState)) {
         v8SetReturnValue(info, v8Value);
-        exceptionState.throwIfNeeded();
         return;
     }
     {% endif %}
     {% endif %}
     {% if attribute.is_check_security_for_return_value %}
 #error Attribute setter with the security check for the return value is not supported.
     {% endif %}
     {% endif %}{# not attribute.is_replaceable and
                   not attribute.constructor_type #}
     {# Convert JS value to C++ value #}
     {% if attribute.idl_type != 'EventHandler' %}
     {% if v8_value_to_local_cpp_value(attribute) %}
     {{v8_value_to_local_cpp_value(attribute) | indent}}
     {% endif %}
     {% elif not is_node %}{# EventHandler hack #}
     moveEventListenerToNewWrapper(info.GetIsolate(), holder, {{attribute.event_handler_getter_expression}}, v8Value, {{v8_class}}::eventListenerCacheIndex);
     {% endif %}
     {# Type checking, possibly throw a TypeError, per:
        http://www.w3.org/TR/WebIDL/#es-type-mapping #}
     {% if attribute.has_type_checking_interface %}
     {# Type checking for interface types (if interface not implemented, throw
        TypeError), per http://www.w3.org/TR/WebIDL/#es-interface #}
     if (!cppValue{% if attribute.is_nullable %} && !isUndefinedOrNull(v8Value){% endif %}) {
         exceptionState.throwTypeError("The provided value is not of type '{{attribute.idl_type}}'.");
-        exceptionState.throwIfNeeded();
         return;
     }
     {% elif attribute.enum_values %}
     {# Setter ignores invalid enum values:
        http://www.w3.org/TR/WebIDL/#idl-enums #}
     {% if not attribute.has_setter_exception_state %}
     NonThrowableExceptionState exceptionState;
     {% endif %}
     {{declare_enum_validation_variable(attribute.enum_values) | indent}}
     if (!isValidEnum(cppValue, validValues, WTF_ARRAY_LENGTH(validValues), "{{attribute.enum_type}}", exceptionState)) {
         currentExecutionContext(info.GetIsolate())->addConsoleMessage(ConsoleMessage::create(JSMessageSource, WarningMessageLevel, exceptionState.message()));
+        // http://heycam.github.io/webidl/#idl-enums
+        // Assignment of an invalid string value to an attribute is ignored,
+        // while passing such a value as an operation argument results in
+        // an exception being thrown.
+        exceptionState.clearException();
         return;
     }
     {% endif %}
     {# Pre-set context #}
     {% if attribute.is_custom_element_callbacks or
           (attribute.is_reflect and
            not(attribute.idl_type == 'DOMString' and is_node)) %}
     {# Skip on compact node DOMString getters #}
     V0CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     {% endif %}
     {% if attribute.is_call_with_execution_context or
           attribute.is_setter_call_with_execution_context %}
     ExecutionContext* executionContext = currentExecutionContext(info.GetIsolate());
     {% endif %}
     {% if attribute.is_call_with_script_state %}
     {% if attribute.is_static %}
     ScriptState* scriptState = ScriptState::forFunctionObject(info);
     {% else %}
     ScriptState* scriptState = ScriptState::forReceiverObject(info);
     {% endif %}
     {% endif %}
     {# Set #}
     {% if attribute.cpp_setter %}
     {{attribute.cpp_setter}};
     {% endif %}
     {# Post-set #}
-    {% if attribute.is_setter_raises_exception %}
-    exceptionState.throwIfNeeded();
-    {% endif %}
     {% if attribute.cached_attribute_validation_method %}
     V8HiddenValue::deleteHiddenValue(ScriptState::current(info.GetIsolate()), holder, v8AtomicString(info.GetIsolate(), "{{attribute.name}}")); // Invalidate the cached value.
     {% endif %}
 }
 {% endmacro %}
 
 
 {##############################################################################}
 {% macro attribute_setter_callback(attribute, world_suffix) %}
 static void {{attribute.name}}AttributeSetterCallback{{world_suffix}}(
@@ skipping 141 matching lines @@
        setter_callback_for_main_world,
        wrapper_type_info,
        access_control,
        property_attribute,
        only_exposed_to_private_script,
        property_location(attribute),
        holder_check,
    ] %}
 {{'{'}}{{attribute_configuration_list | join(', ')}}{{'}'}}
 {%- endmacro %}