Prevent SharedArrayBuffer views from being used in bindings

third_party/WebKit/Source/bindings/scripts/v8_methods.py

Index: third_party/WebKit/Source/bindings/scripts/v8_methods.py
diff --git a/third_party/WebKit/Source/bindings/scripts/v8_methods.py b/third_party/WebKit/Source/bindings/scripts/v8_methods.py
index ee7fb6cea54892b554a9786332e45ecb1e015725..a029cc38deb0880e7042cdd24ace14039be77eac 100644
--- a/third_party/WebKit/Source/bindings/scripts/v8_methods.py
+++ b/third_party/WebKit/Source/bindings/scripts/v8_methods.py
@@ -234,6 +234,30 @@ def argument_context(interface, method, argument, index, is_visible=True):
     this_cpp_value = cpp_value(interface, method, index)
     is_variadic_wrapper_type = argument.is_variadic and idl_type.is_wrapper_type
 
+    # ArrayBufferViews that contain SharedArrayBuffers are not allowed, in
+    # general. These conditions check various patterns that occur in the IDL
+    # files. has_array_buffer_view is a catch-all; if a new method is added
+    # which does not match any specified, it will raise an exception.
+    is_array_buffer_view = idl_type.is_array_buffer_view
+    is_flexible_array_buffer_view = (
+        'FlexibleArrayBufferView' in extended_attributes)
+    is_union_with_abv = (
+        idl_type.is_union_type and
+        any(member_type.is_array_buffer_view
+            for member_type in idl_type.member_types))
+    is_sequence_of_union_with_abv = (
+        idl_type.is_array_or_sequence_type and
+        idl_type.element_type.is_union_type and
+        any(member_type.is_array_buffer_view
+            for member_type in idl_type.element_type.member_types))
+    has_array_buffer_view = any(t.is_array_buffer_view
+                                for t in idl_type.idl_types())
+
+    if has_array_buffer_view and not (
+            is_array_buffer_view or is_union_with_abv or
+            is_sequence_of_union_with_abv):
+        raise Exception('ArrayBufferView in argument with unsupported pattern.')
+
     # [LegacyInterfaceTypeChecking]
     has_type_checking_interface = (
         not is_legacy_interface_type_checking(interface, method) and
@@ -261,13 +285,17 @@ def argument_context(interface, method, argument, index, is_visible=True):
         'idl_type': idl_type.base_type,
         'idl_type_object': idl_type,
         'index': index,
+        'is_array_buffer_view': is_array_buffer_view,
         'is_callback_function': idl_type.is_callback_function,
         'is_callback_interface': idl_type.is_callback_interface,
         # FIXME: Remove generic 'Dictionary' special-casing
         'is_dictionary': idl_type.is_dictionary or idl_type.base_type == 'Dictionary',
         'is_explicit_nullable': idl_type.is_explicit_nullable,
+        'is_flexible_array_buffer_view': is_flexible_array_buffer_view,
         'is_nullable': idl_type.is_nullable,
         'is_optional': argument.is_optional,
+        'is_sequence_of_union_with_array_buffer_view': is_sequence_of_union_with_abv,
+        'is_union_with_array_buffer_view': is_union_with_abv,
         'is_variadic': argument.is_variadic,
         'is_variadic_wrapper_type': is_variadic_wrapper_type,
         'is_wrapper_type': idl_type.is_wrapper_type,