IDL: Generate union type containers

Source/bindings/scripts/v8_types.py

Index: Source/bindings/scripts/v8_types.py
diff --git a/Source/bindings/scripts/v8_types.py b/Source/bindings/scripts/v8_types.py
index 57e83dca94d9414c29b7aa7f7fa90c82d8b718f0..0b29c012472e7bc25535d3eb7d7e996d0ad5ecce 100644
--- a/Source/bindings/scripts/v8_types.py
+++ b/Source/bindings/scripts/v8_types.py
@@ -150,6 +150,9 @@ def cpp_type(idl_type, extended_attributes=None, raw_type=False, used_as_rvalue_
     extended_attributes = extended_attributes or {}
     idl_type = idl_type.preprocessed_type
 
+    if idl_type.is_union_type:

[Jens Widell, 2014/10/28 11:31:38]

This ought to be moved to after the array/sequence handling. Having it here
breaks arrays or sequences of unions.

[bashi, 2014/10/29 01:34:32]

Done.

+        return idl_type.name
+
     # Array or sequence types
     if used_as_variadic_argument:
         native_array_element_type = idl_type
@@ -220,23 +223,11 @@ def cpp_type_initializer(idl_type):
     return ' = nullptr'
 
 
-def cpp_type_union(idl_type, extended_attributes=None, raw_type=False):
-    # FIXME: Need to revisit the design of union support.
-    # http://crbug.com/240176
-    return None
-
-
-def cpp_type_initializer_union(idl_type):
-    return (member_type.cpp_type_initializer for member_type in idl_type.member_types)
-
-
 # Allow access as idl_type.cpp_type if no arguments
 IdlTypeBase.cpp_type = property(cpp_type)
 IdlTypeBase.cpp_type_initializer = property(cpp_type_initializer)
 IdlTypeBase.cpp_type_args = cpp_type
-IdlUnionType.cpp_type = property(cpp_type_union)
-IdlUnionType.cpp_type_initializer = property(cpp_type_initializer_union)
-IdlUnionType.cpp_type_args = cpp_type_union
+IdlUnionType.cpp_type_initializer = ''
 
 
 IdlArrayOrSequenceType.native_array_element_type = property(
@@ -484,6 +475,7 @@ def v8_conversion_needs_exception_state(idl_type):
 
 IdlType.v8_conversion_needs_exception_state = property(v8_conversion_needs_exception_state)
 IdlArrayOrSequenceType.v8_conversion_needs_exception_state = True
+IdlUnionType.v8_conversion_needs_exception_state = True
 
 
 TRIVIAL_CONVERSIONS = frozenset([
@@ -684,12 +676,8 @@ def v8_conversion_type(idl_type, extended_attributes):
     """
     extended_attributes = extended_attributes or {}
 
-    # FIXME: Support union type.
-    if idl_type.is_union_type:
-        return ''
-
-    if idl_type.is_dictionary:
-        return 'IDLDictionary'
+    if idl_type.is_dictionary or idl_type.is_union_type:
+        return 'StackAllocatedContainer'
 
     # Array or sequence types
     native_array_element_type = idl_type.native_array_element_type
@@ -757,7 +745,8 @@ V8_SET_RETURN_VALUE = {
     'DOMWrapperForMainWorld': 'v8SetReturnValueForMainWorld(info, WTF::getPtr({cpp_value}))',
     'DOMWrapperFast': 'v8SetReturnValueFast(info, WTF::getPtr({cpp_value}), {script_wrappable})',
     'DOMWrapperDefault': 'v8SetReturnValue(info, {cpp_value})',
-    'IDLDictionary': 'v8SetReturnValue(info, result)',
+    # Union types or dictionaries
+    'StackAllocatedContainer': 'v8SetReturnValue(info, result)',
 }
 
 
@@ -789,19 +778,10 @@ def v8_set_return_value(idl_type, cpp_value, extended_attributes=None, script_wr
     return statement
 
 
-def v8_set_return_value_union(idl_type, cpp_value, extended_attributes=None, script_wrappable='', release=False, for_main_world=False):
-    # FIXME: Need to revisit the design of union support.
-    # http://crbug.com/240176
-    return None
-
-
 IdlTypeBase.v8_set_return_value = v8_set_return_value
-IdlUnionType.v8_set_return_value = v8_set_return_value_union
 
 IdlType.release = property(lambda self: self.is_interface_type)
-IdlUnionType.release = property(
-    lambda self: [member_type.is_interface_type
-                  for member_type in self.member_types])
+IdlUnionType.release = False
 
 
 CPP_VALUE_TO_V8_VALUE = {
@@ -828,7 +808,8 @@ CPP_VALUE_TO_V8_VALUE = {
     # General
     'array': 'v8Array({cpp_value}, {creation_context}, {isolate})',
     'DOMWrapper': 'toV8({cpp_value}, {creation_context}, {isolate})',
-    'IDLDictionary': 'toV8({cpp_value}, {creation_context}, {isolate})',
+    # Union types and dictionaries
+    'StackAllocatedContainer': 'toV8({cpp_value}, {creation_context}, {isolate})',
 }