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