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WebGPU requires certain variables to be initialized, whereas there are known issues with using initializers in Vulkan. This PR is the first of three implementing a pass to decompose initialized variables into a variable declaration followed by a store. This has been broken up into multiple PRs, because there 3 distinct cases that need to be handled, which require separate implementations. This first PR implements the basic infrastructure that is needed, and handling of Function storage class variables. Private and Output will be handled in future PRs. This is part of resolving #2388
63 lines
2.6 KiB
C++
63 lines
2.6 KiB
C++
// Copyright (c) 2019 Google LLC.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SOURCE_OPT_GENERATE_WEBGPU_INITIALIZERS_PASS_H_
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#define SOURCE_OPT_GENERATE_WEBGPU_INITIALIZERS_PASS_H_
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#include "source/opt/ir_context.h"
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#include "source/opt/module.h"
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#include "source/opt/pass.h"
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namespace spvtools {
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namespace opt {
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// Adds initializers to variables with storage classes Output, Private, and
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// Function if they are missing. In the WebGPU environment these storage classes
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// require that the variables are initialized. Currently they are initialized to
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// NULL, though in the future some of them may be initialized to the first value
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// that is stored in them, if that was a constant.
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class GenerateWebGPUInitializersPass : public Pass {
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public:
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const char* name() const override { return "generate-webgpu-initializers"; }
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Status Process() override;
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IRContext::Analysis GetPreservedAnalyses() override {
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return IRContext::kAnalysisInstrToBlockMapping |
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IRContext::kAnalysisDecorations | IRContext::kAnalysisCombinators |
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IRContext::kAnalysisCFG | IRContext::kAnalysisDominatorAnalysis |
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IRContext::kAnalysisLoopAnalysis | IRContext::kAnalysisNameMap |
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IRContext::kAnalysisScalarEvolution |
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IRContext::kAnalysisRegisterPressure |
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IRContext::kAnalysisValueNumberTable |
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IRContext::kAnalysisStructuredCFG |
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IRContext::kAnalysisBuiltinVarId |
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IRContext::kAnalysisIdToFuncMapping | IRContext::kAnalysisTypes |
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IRContext::kAnalysisDefUse | IRContext::kAnalysisConstants;
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}
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private:
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using NullConstantTypeMap = std::unordered_map<uint32_t, Instruction*>;
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NullConstantTypeMap null_constant_type_map_;
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std::unordered_set<Instruction*> seen_null_constants_;
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Instruction* GetNullConstantForVariable(Instruction* variable_inst);
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void AddNullInitializerToVariable(Instruction* constant_inst,
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Instruction* variable_inst);
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};
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} // namespace opt
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} // namespace spvtools
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#endif // SOURCE_OPT_GENERATE_WEBGPU_INITIALIZERS_PASS_H_
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