1 // Copyright (c) 2019 Google LLC. 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 SOURCE_OPT_GENERATE_WEBGPU_INITIALIZERS_PASS_H_ 16 #define SOURCE_OPT_GENERATE_WEBGPU_INITIALIZERS_PASS_H_ 17 18 #include "source/opt/ir_context.h" 19 #include "source/opt/module.h" 20 #include "source/opt/pass.h" 21 22 namespace spvtools { 23 namespace opt { 24 25 // Adds initializers to variables with storage classes Output, Private, and 26 // Function if they are missing. In the WebGPU environment these storage classes 27 // require that the variables are initialized. Currently they are initialized to 28 // NULL, though in the future some of them may be initialized to the first value 29 // that is stored in them, if that was a constant. 30 class GenerateWebGPUInitializersPass : public Pass { 31 public: name()32 const char* name() const override { return "generate-webgpu-initializers"; } 33 Status Process() override; 34 GetPreservedAnalyses()35 IRContext::Analysis GetPreservedAnalyses() override { 36 return IRContext::kAnalysisInstrToBlockMapping | 37 IRContext::kAnalysisDecorations | IRContext::kAnalysisCombinators | 38 IRContext::kAnalysisCFG | IRContext::kAnalysisDominatorAnalysis | 39 IRContext::kAnalysisLoopAnalysis | IRContext::kAnalysisNameMap | 40 IRContext::kAnalysisScalarEvolution | 41 IRContext::kAnalysisRegisterPressure | 42 IRContext::kAnalysisValueNumberTable | 43 IRContext::kAnalysisStructuredCFG | 44 IRContext::kAnalysisBuiltinVarId | 45 IRContext::kAnalysisIdToFuncMapping | IRContext::kAnalysisTypes | 46 IRContext::kAnalysisDefUse | IRContext::kAnalysisConstants; 47 } 48 49 private: 50 using NullConstantTypeMap = std::unordered_map<uint32_t, Instruction*>; 51 NullConstantTypeMap null_constant_type_map_; 52 std::unordered_set<Instruction*> seen_null_constants_; 53 54 Instruction* GetNullConstantForVariable(Instruction* variable_inst); 55 void AddNullInitializerToVariable(Instruction* constant_inst, 56 Instruction* variable_inst); 57 }; 58 59 } // namespace opt 60 } // namespace spvtools 61 62 #endif // SOURCE_OPT_GENERATE_WEBGPU_INITIALIZERS_PASS_H_ 63