| // 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_EXPAND_COMPOUND_ASSIGNMENT_H_ |
| #define SRC_TINT_TRANSFORM_EXPAND_COMPOUND_ASSIGNMENT_H_ |
| |
| #include "src/tint/transform/transform.h" |
| |
| namespace tint::transform { |
| |
| /// Converts compound assignment statements to regular assignment statements, |
| /// hoisting the LHS expression if necessary. |
| /// |
| /// Before: |
| /// ``` |
| /// a += 1; |
| /// vector_array[foo()][bar()] *= 2.0; |
| /// ``` |
| /// |
| /// After: |
| /// ``` |
| /// a = a + 1; |
| /// let _vec = &vector_array[foo()]; |
| /// let _idx = bar(); |
| /// (*_vec)[_idx] = (*_vec)[_idx] * 2.0; |
| /// ``` |
| /// |
| /// This transform also handles increment and decrement statements in the same |
| /// manner, by replacing `i++` with `i = i + 1`. |
| class ExpandCompoundAssignment : public Castable<ExpandCompoundAssignment, Transform> { |
| public: |
| /// Constructor |
| ExpandCompoundAssignment(); |
| /// Destructor |
| ~ExpandCompoundAssignment() override; |
| |
| /// @param program the program to inspect |
| /// @param data optional extra transform-specific input data |
| /// @returns true if this transform should be run for the given program |
| bool ShouldRun(const Program* program, const DataMap& data = {}) const 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_EXPAND_COMPOUND_ASSIGNMENT_H_ |