1 // Copyright 2021 The Tint Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef SRC_TRANSFORM_SIMPLIFY_POINTERS_H_ 16 #define SRC_TRANSFORM_SIMPLIFY_POINTERS_H_ 17 18 #include "src/transform/transform.h" 19 20 namespace tint { 21 namespace transform { 22 23 /// SimplifyPointers is a Transform that moves all usage of function-scope 24 /// `let` statements of a pointer type into their places of usage, while also 25 /// simplifying any chains of address-of or indirections operators. 26 /// 27 /// Parameters of a pointer type are not adjusted. 28 /// 29 /// Note: SimplifyPointers does not operate on module-scope `let`s, as these 30 /// cannot be pointers: https://gpuweb.github.io/gpuweb/wgsl/#module-constants 31 /// `A module-scope let-declared constant must be of constructible type.` 32 class SimplifyPointers : public Castable<SimplifyPointers, Transform> { 33 public: 34 /// Constructor 35 SimplifyPointers(); 36 37 /// Destructor 38 ~SimplifyPointers() override; 39 40 protected: 41 struct State; 42 43 /// Runs the transform using the CloneContext built for transforming a 44 /// program. Run() is responsible for calling Clone() on the CloneContext. 45 /// @param ctx the CloneContext primed with the input program and 46 /// ProgramBuilder 47 /// @param inputs optional extra transform-specific input data 48 /// @param outputs optional extra transform-specific output data 49 void Run(CloneContext& ctx, const DataMap& inputs, DataMap& outputs) override; 50 }; 51 52 } // namespace transform 53 } // namespace tint 54 55 #endif // SRC_TRANSFORM_SIMPLIFY_POINTERS_H_ 56