| // Copyright (c) 2016 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 LIBSPIRV_OPT_DEF_USE_MANAGER_H_ |
| #define LIBSPIRV_OPT_DEF_USE_MANAGER_H_ |
| |
| #include <list> |
| #include <unordered_map> |
| #include <utility> |
| #include <vector> |
| |
| #include "instruction.h" |
| #include "module.h" |
| |
| namespace spvtools { |
| namespace opt { |
| namespace analysis { |
| |
| // Class for representing a use of id. Note that: |
| // * Result type id is a use. |
| // * Ids referenced in OpSectionMerge & OpLoopMerge are considered as use. |
| // * Ids referenced in OpPhi's in operands are considered as use. |
| struct Use { |
| ir::Instruction* inst; // Instruction using the id. |
| uint32_t operand_index; // logical operand index of the id use. This can be |
| // the index of result type id. |
| }; |
| |
| using UseList = std::list<Use>; |
| |
| // A class for analyzing and managing defs and uses in an ir::Module. |
| class DefUseManager { |
| public: |
| using IdToDefMap = std::unordered_map<uint32_t, ir::Instruction*>; |
| using IdToUsesMap = std::unordered_map<uint32_t, UseList>; |
| |
| inline explicit DefUseManager(ir::Module* module) { AnalyzeDefUse(module); } |
| DefUseManager(const DefUseManager&) = delete; |
| DefUseManager(DefUseManager&&) = delete; |
| DefUseManager& operator=(const DefUseManager&) = delete; |
| DefUseManager& operator=(DefUseManager&&) = delete; |
| |
| // Analyzes the defs and uses in the given |inst|. |
| void AnalyzeInstDefUse(ir::Instruction* inst); |
| |
| // Returns the def instruction for the given |id|. If there is no instruction |
| // defining |id|, returns nullptr. |
| ir::Instruction* GetDef(uint32_t id); |
| // Returns the use instructions for the given |id|. If there is no uses of |
| // |id|, returns nullptr. |
| UseList* GetUses(uint32_t id); |
| const UseList* GetUses(uint32_t id) const; |
| // Returns the annotation instrunctions which are a direct use of the given |
| // |id|. This means when the decorations are applied through decoration |
| // group(s), this function will just return the OpGroupDecorate |
| // instrcution(s) which refer to the given id as an operand. The OpDecorate |
| // instructions which decorate the decoration group will not be returned. |
| std::vector<ir::Instruction*> GetAnnotations(uint32_t id) const; |
| |
| // Returns the map from ids to their def instructions. |
| const IdToDefMap& id_to_defs() const { return id_to_def_; } |
| // Returns the map from ids to their uses in instructions. |
| const IdToUsesMap& id_to_uses() const { return id_to_uses_; } |
| |
| // Turns the instruction defining the given |id| into a Nop. Returns true on |
| // success, false if the given |id| is not defined at all. This method also |
| // erases both the uses of |id| and the information of this |id|-generating |
| // instruction's uses of its operands. |
| bool KillDef(uint32_t id); |
| // Turns the given instruction |inst| to a Nop. This method erases the |
| // information of the given instruction's uses of its operands. If |inst| |
| // defines an result id, the uses of the result id will also be erased. |
| void KillInst(ir::Instruction* inst); |
| // Replaces all uses of |before| id with |after| id. Returns true if any |
| // replacement happens. This method does not kill the definition of the |
| // |before| id. If |after| is the same as |before|, does nothing and returns |
| // false. |
| bool ReplaceAllUsesWith(uint32_t before, uint32_t after); |
| |
| private: |
| using InstToUsedIdsMap = |
| std::unordered_map<const ir::Instruction*, std::vector<uint32_t>>; |
| |
| // Analyzes the defs and uses in the given |module| and populates data |
| // structures in this class. Does nothing if |module| is nullptr. |
| void AnalyzeDefUse(ir::Module* module); |
| |
| // Clear the internal def-use record of the given instruction |inst|. This |
| // method will update the use information of the operand ids of |inst|. The |
| // record: |inst| uses an |id|, will be removed from the use records of |id|. |
| // If |inst| defines an result id, the use record of this result id will also |
| // be removed. Does nothing if |inst| was not analyzed before. |
| void ClearInst(ir::Instruction* inst); |
| |
| // Erases the records that a given instruction uses its operand ids. |
| void EraseUseRecordsOfOperandIds(const ir::Instruction* inst); |
| |
| IdToDefMap id_to_def_; // Mapping from ids to their definitions |
| IdToUsesMap id_to_uses_; // Mapping from ids to their uses |
| // Mapping from instructions to the ids used in the instructions generating |
| // the result ids. |
| InstToUsedIdsMap inst_to_used_ids_; |
| }; |
| |
| } // namespace analysis |
| } // namespace opt |
| } // namespace spvtools |
| |
| #endif // LIBSPIRV_OPT_DEF_USE_MANAGER_H_ |