| // 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_TRANSFORM_PROMOTE_INITIALIZERS_TO_LET_H_ |
| #define SRC_TINT_TRANSFORM_PROMOTE_INITIALIZERS_TO_LET_H_ |
| |
| #include "src/tint/transform/transform.h" |
| |
| namespace tint::transform { |
| |
| /// A transform that hoists array and structure constructors, and identifiers resolving to a |
| /// 'const' array to a 'let' variable, declared just before the statement of usage. |
| /// This transform is used by backends that do not support expressions that operate on an immediate |
| /// array or structure. For example, the following is not immediately expressable for HLSL: |
| /// `array<i32, 2>(1, 2)[0]` |
| /// @see crbug.com/tint/406 |
| class PromoteInitializersToLet : public Castable<PromoteInitializersToLet, Transform> { |
| public: |
| /// Constructor |
| PromoteInitializersToLet(); |
| |
| /// Destructor |
| ~PromoteInitializersToLet() override; |
| |
| protected: |
| /// Runs the transform using the CloneContext built for transforming a |
| /// program. Run() is responsible for calling Clone() on the CloneContext. |
| /// @param ctx the CloneContext primed with the input program and |
| /// ProgramBuilder |
| /// @param inputs optional extra transform-specific input data |
| /// @param outputs optional extra transform-specific output data |
| void Run(CloneContext& ctx, const DataMap& inputs, DataMap& outputs) const override; |
| }; |
| |
| } // namespace tint::transform |
| |
| #endif // SRC_TINT_TRANSFORM_PROMOTE_INITIALIZERS_TO_LET_H_ |