text: // 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_ID_USE_DESCRIPTOR_H_
  #define SOURCE_FUZZ_ID_USE_DESCRIPTOR_H_
  
  #include "source/fuzz/protobufs/spirvfuzz_protobufs.h"
  #include "source/opt/ir_context.h"
  
  namespace spvtools {
  namespace fuzz {
  
  // Looks for an instruction in |context| that contains a use
  // identified by |id_use_descriptor|.
  // Returns |nullptr| if no such instruction can be found.
  opt::Instruction* FindInstructionContainingUse(
      const protobufs::IdUseDescriptor& id_use_descriptor,
      opt::IRContext* context);
  
  // Creates an IdUseDescriptor protobuf message from the given components.
  // See the protobuf definition for details of what these components mean.
  protobufs::IdUseDescriptor MakeIdUseDescriptor(
      uint32_t id_of_interest,
      const protobufs::InstructionDescriptor& enclosing_instruction,
      uint32_t in_operand_index);
  
  // Given an id use, represented by the instruction |inst| that uses the id, and
  // the input operand index |in_operand_index| associated with the usage, returns
  // an IdUseDescriptor that represents the use.
  protobufs::IdUseDescriptor MakeIdUseDescriptorFromUse(
      opt::IRContext* context, opt::Instruction* inst, uint32_t in_operand_index);
  
  }  // namespace fuzz
  }  // namespace spvtools
  
  #endif  // SOURCE_FUZZ_ID_USE_DESCRIPTOR_H_
  