mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
// Copyright (c) 2017 Google Inc.
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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_ID_DESCRIPTOR_H_
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#define SOURCE_ID_DESCRIPTOR_H_
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#include <unordered_map>
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#include <vector>
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#include "spirv-tools/libspirv.hpp"
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namespace spvtools {
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using CustomHashFunc = std::function<uint32_t(const std::vector<uint32_t>&)>;
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// Computes and stores id descriptors.
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//
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// Descriptors are computed as hash of all words in the instruction where ids
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// were substituted with previously computed descriptors.
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class IdDescriptorCollection {
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public:
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explicit IdDescriptorCollection(
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CustomHashFunc custom_hash_func = CustomHashFunc())
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: custom_hash_func_(custom_hash_func) {
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words_.reserve(16);
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}
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// Computes descriptor for the result id of the given instruction and
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// registers it in id_to_descriptor_. Returns the computed descriptor.
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// This function needs to be sequentially called for every instruction in the
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// module.
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uint32_t ProcessInstruction(const spv_parsed_instruction_t& inst);
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// Returns a previously computed descriptor id.
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uint32_t GetDescriptor(uint32_t id) const {
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const auto it = id_to_descriptor_.find(id);
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if (it == id_to_descriptor_.end()) return 0;
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return it->second;
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}
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private:
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std::unordered_map<uint32_t, uint32_t> id_to_descriptor_;
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std::function<uint32_t(const std::vector<uint32_t>&)> custom_hash_func_;
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// Scratch buffer used for hashing. Class member to optimize on allocation.
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std::vector<uint32_t> words_;
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};
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} // namespace spvtools
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#endif // SOURCE_ID_DESCRIPTOR_H_
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