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// Copyright (c) 2018 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_REDUCE_REMOVE_UNUSED_STRUCT_MEMBER_REDUCTION_OPPORTUNITY_FINDER_H_
#define SOURCE_REDUCE_REMOVE_UNUSED_STRUCT_MEMBER_REDUCTION_OPPORTUNITY_FINDER_H_
#include "source/reduce/reduction_opportunity_finder.h"
namespace spvtools {
namespace reduce {
// A finder for opportunities to remove struct members that are not explicitly
// used by extract, insert or access chain instructions.
class RemoveUnusedStructMemberReductionOpportunityFinder
: public ReductionOpportunityFinder {
public:
RemoveUnusedStructMemberReductionOpportunityFinder() = default;
~RemoveUnusedStructMemberReductionOpportunityFinder() override = default;
std::string GetName() const final;
std::vector<std::unique_ptr<ReductionOpportunity>> GetAvailableOpportunities(
opt::IRContext* context, uint32_t target_function) const final;
private:
// A helper method to update |unused_members_to_structs| by removing from it
// all struct member accesses that take place in
// |composite_access_instruction|.
//
// |composite_type_id| is the type of the root object indexed into by the
// instruction.
//
// |first_index_in_operand| provides indicates where in the input operands the
// sequence of indices begins.
//
// |literal_indices| indicates whether indices are literals (true) or ids
// (false).
void MarkAccessedMembersAsUsed(
opt::IRContext* context, uint32_t composite_type_id,
uint32_t first_index_in_operand, bool literal_indices,
const opt::Instruction& composite_access_instruction,
std::map<uint32_t, std::set<opt::Instruction*>>* unused_member_to_structs)
const;
};
} // namespace reduce
} // namespace spvtools
#endif // SOURCE_REDUCE_REMOVE_UNUSED_STRUCT_MEMBER_REDUCTION_OPPORTUNITY_FINDER_H_
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