Mojo: Correctly handle large unsigned integer literals.

mojo/public/tools/bindings/generators/mojom_cpp_generator.py

Index: mojo/public/tools/bindings/generators/mojom_cpp_generator.py
diff --git a/mojo/public/tools/bindings/generators/mojom_cpp_generator.py b/mojo/public/tools/bindings/generators/mojom_cpp_generator.py
index 9a6bbb79148e25fbe39d83d441c9eda9ead553e8..940704afdfddd9a686491111867e481da3d7da64 100644
--- a/mojo/public/tools/bindings/generators/mojom_cpp_generator.py
+++ b/mojo/public/tools/bindings/generators/mojom_cpp_generator.py
@@ -29,12 +29,23 @@ _kind_to_cpp_type = {
   mojom.DOUBLE:       "double",
 }
 
+_kind_to_cpp_literal_suffix = {
+  mojom.UINT8:        "U",
+  mojom.UINT16:       "U",
+  mojom.UINT32:       "U",
+  mojom.FLOAT:        "f",
+  mojom.UINT64:       "ULL",
+}
+
+def ConstantValue(constant):
+  return ExpressionToText(constant.value, kind=constant.kind)
+
 def DefaultValue(field):
   if field.default:
     if isinstance(field.kind, mojom.Struct):
       assert field.default == "default"
       return "%s::New()" % GetNameForKind(field.kind)
-    return ExpressionToText(field.default)
+    return ExpressionToText(field.default, kind=field.kind)
   return ""
 
 def NamespaceToArray(namespace):
@@ -193,7 +204,7 @@ def IsStructWithHandles(struct):
       return True
   return False
 
-def TranslateConstants(token):
+def TranslateConstants(token, kind):
   if isinstance(token, (mojom.NamedValue, mojom.EnumValue)):
     # Both variable and enum constants are constructed like:
     # Namespace::Struct::CONSTANT_NAME
@@ -204,10 +215,10 @@ def TranslateConstants(token):
       name.append(token.parent_kind.name)
     name.append(token.name)
     return "::".join(name)
-  return token
+  return '%s%s' % (token, _kind_to_cpp_literal_suffix.get(kind, ''))
 
-def ExpressionToText(value):
-  return TranslateConstants(value)
+def ExpressionToText(value, kind=None):
+  return TranslateConstants(value, kind)
 
 def HasCallbacks(interface):
   for method in interface.methods:
@@ -229,6 +240,7 @@ _HEADER_SIZE = 8
 class Generator(generator.Generator):
 
   cpp_filters = {
+    "constant_value": ConstantValue,
     "cpp_const_wrapper_type": GetCppConstWrapperType,
     "cpp_field_type": GetCppFieldType,
     "cpp_pod_type": GetCppPodType,