Freeze global prototype chain per WebIDL

third_party/WebKit/Source/bindings/scripts/v8_interface.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 # coding=utf-8
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 180 matching lines @@
         includes.add('bindings/core/v8/BindingSecurity.h')
         includes.add('core/frame/LocalDOMWindow.h')
 
     # [DependentLifetime]
     is_dependent_lifetime = 'DependentLifetime' in extended_attributes
 
     # [PrimaryGlobal] and [Global]
     is_global = ('PrimaryGlobal' in extended_attributes or
                  'Global' in extended_attributes)
 
+    # [ImmutablePrototype]
+    # TODO(littledan): Is it possible to deduce this based on inheritance,
+    # as in the WebIDL spec?
+    is_immutable_prototype = is_global or 'ImmutablePrototype' in extended_attributes

[haraken, 2016/10/27 08:47:05]

Why is is_global not enough? You want to set the immutable prototype only on
[Global] or [PrimaryGlobal] interfaces, right?

[Dan Ehrenberg, 2016/10/27 09:03:45]

Also EventTarget

+
     # [SetWrapperReferenceFrom]
     set_wrapper_reference_from = extended_attributes.get('SetWrapperReferenceFrom')
     if set_wrapper_reference_from:
         includes.update(['bindings/core/v8/V8GCController.h',
                          'core/dom/Element.h'])
 
     # [SetWrapperReferenceTo]
     set_wrapper_reference_to_argument = extended_attributes.get('SetWrapperReferenceTo')
     set_wrapper_reference_to = None
     if set_wrapper_reference_to_argument:
@@ skipping 40 matching lines @@
         'has_partial_interface': len(interface.partial_interfaces) > 0,
         'has_visit_dom_wrapper': has_visit_dom_wrapper,
         'has_visit_dom_wrapper_custom': has_visit_dom_wrapper_custom,
         'header_includes': header_includes,
         'interface_name': interface.name,
         'is_array_buffer_or_view': is_array_buffer_or_view,
         'is_check_security': is_check_security,
         'is_event_target': is_event_target,
         'is_exception': interface.is_exception,
         'is_global': is_global,
+        'is_immutable_prototype': is_immutable_prototype,
         'is_node': inherits_interface(interface.name, 'Node'),
         'is_partial': interface.is_partial,
         'is_typed_array_type': is_typed_array_type,
         'lifetime': 'Dependent' if (has_visit_dom_wrapper or is_dependent_lifetime) else 'Independent',
         'measure_as': v8_utilities.measure_as(interface, None),  # [MeasureAs]
         'origin_trial_enabled_function': v8_utilities.origin_trial_enabled_function_name(interface),
         'parent_interface': parent_interface,
         'pass_cpp_type': cpp_name(interface) + '*',
         'active_scriptwrappable': active_scriptwrappable,
         'runtime_enabled_function': runtime_enabled_function_name(interface),  # [RuntimeEnabled]
@@ skipping 1178 matching lines @@
     extended_attributes = deleter.extended_attributes
     is_call_with_script_state = v8_utilities.has_extended_attribute_value(deleter, 'CallWith', 'ScriptState')
     is_ce_reactions = 'CEReactions' in extended_attributes
     return {
         'is_call_with_script_state': is_call_with_script_state,
         'is_ce_reactions': is_ce_reactions,
         'is_custom': 'Custom' in extended_attributes,
         'is_raises_exception': 'RaisesException' in extended_attributes,
         'name': cpp_name(deleter),
     }