| // Copyright (c) 2019 Google LLC |
| // |
| // 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_FUZZ_TRANSFORMATION_REPLACE_ID_WITH_SYNONYM_H_ |
| #define SOURCE_FUZZ_TRANSFORMATION_REPLACE_ID_WITH_SYNONYM_H_ |
| |
| #include "source/fuzz/fact_manager.h" |
| #include "source/fuzz/protobufs/spirvfuzz_protobufs.h" |
| #include "source/fuzz/transformation.h" |
| #include "source/opt/ir_context.h" |
| |
| namespace spvtools { |
| namespace fuzz { |
| |
| class TransformationReplaceIdWithSynonym : public Transformation { |
| public: |
| explicit TransformationReplaceIdWithSynonym( |
| const protobufs::TransformationReplaceIdWithSynonym& message); |
| |
| TransformationReplaceIdWithSynonym( |
| protobufs::IdUseDescriptor id_use_descriptor, uint32_t synonymous_id); |
| |
| // - The fact manager must know that the id identified by |
| // |message_.id_use_descriptor| is synonomous with |
| // |message_.synonymous_id|. |
| // - Replacing the id in |message_.id_use_descriptor| by |
| // |message_.synonymous_id| must respect SPIR-V's rules about uses being |
| // dominated by their definitions. |
| // - The id must not be an index into an access chain whose base object has |
| // struct type, as such indices must be constants. |
| // - The id must not be a pointer argument to a function call (because the |
| // synonym might not be a memory object declaration). |
| // - |fresh_id_for_temporary| must be 0. |
| bool IsApplicable(opt::IRContext* context, |
| const FactManager& fact_manager) const override; |
| |
| // Replaces the use identified by |message_.id_use_descriptor| with the |
| // synonymous id identified by |message_.synonymous_id|. |
| void Apply(opt::IRContext* context, FactManager* fact_manager) const override; |
| |
| protobufs::Transformation ToMessage() const override; |
| |
| // Checks whether the |id| is available (according to dominance rules) at the |
| // use point defined by input operand |use_input_operand_index| of |
| // |use_instruction|. |
| static bool IdsIsAvailableAtUse(opt::IRContext* context, |
| opt::Instruction* use_instruction, |
| uint32_t use_input_operand_index, |
| uint32_t id); |
| |
| // Checks whether various conditions hold related to the acceptability of |
| // replacing the id use at |use_in_operand_index| of |use_instruction| with |
| // a synonym. In particular, this checks that: |
| // - the id use is not an index into a struct field in an OpAccessChain - such |
| // indices must be constants, so it is dangerous to replace them. |
| // - the id use is not a pointer function call argument, on which there are |
| // restrictions that make replacement problematic. |
| static bool UseCanBeReplacedWithSynonym(opt::IRContext* context, |
| opt::Instruction* use_instruction, |
| uint32_t use_in_operand_index); |
| |
| private: |
| protobufs::TransformationReplaceIdWithSynonym message_; |
| }; |
| |
| } // namespace fuzz |
| } // namespace spvtools |
| |
| #endif // SOURCE_FUZZ_TRANSFORMATION_REPLACE_ID_WITH_SYNONYM_H_ |