| # Copyright 2023 Google LLC |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # https://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| """Attributes in the C++ backend and associated metadata.""" |
| |
| from enum import Enum |
| from compiler.util import attribute_util |
| |
| |
| class Attribute(str, Enum): |
| """Attributes available in the C++ backend.""" |
| NAMESPACE = "namespace" |
| ENUM_CASE = "enum_case" |
| |
| |
| # Types associated with C++ backend attributes. |
| TYPES = { |
| Attribute.NAMESPACE: attribute_util.STRING, |
| Attribute.ENUM_CASE: attribute_util.STRING, |
| } |
| |
| |
| class Scope(set[tuple[Attribute, bool]], Enum): |
| """Allowed scopes for C++ backend attributes. |
| |
| Each entry is a set of (Attribute, default?) tuples, the first value being |
| the attribute itself, the second value being a boolean value indicating |
| whether the attribute is allowed to be defaulted in that scope.""" |
| BITS = { |
| # Bits may contain an enum definition. |
| (Attribute.ENUM_CASE, True) |
| } |
| ENUM = { |
| (Attribute.ENUM_CASE, True), |
| } |
| ENUM_VALUE = { |
| (Attribute.ENUM_CASE, False), |
| } |
| MODULE = { |
| (Attribute.NAMESPACE, False), |
| (Attribute.ENUM_CASE, True), |
| }, |
| STRUCT = { |
| # Struct may contain an enum definition. |
| (Attribute.ENUM_CASE, True), |
| } |