| // Copyright 2022 The Tint Authors. |
| // |
| // 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 |
| // |
| // http://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. |
| |
| #ifndef SRC_TINT_AST_OVERRIDE_H_ |
| #define SRC_TINT_AST_OVERRIDE_H_ |
| |
| #include "src/tint/ast/variable.h" |
| |
| namespace tint::ast { |
| |
| /// An "override" declaration - a name for a pipeline-overridable constant. |
| /// Examples: |
| /// |
| /// ``` |
| /// override radius : i32 = 2; // Can be overridden by name. |
| /// @id(5) override width : i32 = 2; // Can be overridden by ID. |
| /// override scale : f32; // No default - must be overridden. |
| /// ``` |
| /// @see https://www.w3.org/TR/WGSL/#override-decls |
| class Override final : public Castable<Override, Variable> { |
| public: |
| /// Create an 'override' pipeline-overridable constant. |
| /// @param program_id the identifier of the program that owns this node |
| /// @param source the variable source |
| /// @param sym the variable symbol |
| /// @param type the declared variable type |
| /// @param constructor the constructor expression |
| /// @param attributes the variable attributes |
| Override(ProgramID program_id, |
| const Source& source, |
| const Symbol& sym, |
| const ast::Type* type, |
| const Expression* constructor, |
| AttributeList attributes); |
| |
| /// Move constructor |
| Override(Override&&); |
| |
| /// Destructor |
| ~Override() override; |
| |
| /// @returns "override" |
| const char* Kind() const override; |
| |
| /// Clones this node and all transitive child nodes using the `CloneContext` |
| /// `ctx`. |
| /// @param ctx the clone context |
| /// @return the newly cloned node |
| const Override* Clone(CloneContext* ctx) const override; |
| }; |
| |
| } // namespace tint::ast |
| |
| #endif // SRC_TINT_AST_OVERRIDE_H_ |