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.
  
  #include "source/fuzz/fuzzer_pass_add_no_contraction_decorations.h"
  
  #include "source/fuzz/transformation_add_no_contraction_decoration.h"
  
  namespace spvtools {
  namespace fuzz {
  
  FuzzerPassAddNoContractionDecorations::FuzzerPassAddNoContractionDecorations(
      opt::IRContext* ir_context, FactManager* fact_manager,
      FuzzerContext* fuzzer_context,
      protobufs::TransformationSequence* transformations)
      : FuzzerPass(ir_context, fact_manager, fuzzer_context, transformations) {}
  
  FuzzerPassAddNoContractionDecorations::
      ~FuzzerPassAddNoContractionDecorations() = default;
  
  void FuzzerPassAddNoContractionDecorations::Apply() {
    // Consider every instruction in every block in every function.
    for (auto& function : *GetIRContext()->module()) {
      for (auto& block : function) {
        for (auto& inst : block) {
          // Restrict attention to arithmetic instructions (as defined in the
          // SPIR-V specification).
          if (TransformationAddNoContractionDecoration::IsArithmetic(
                  inst.opcode())) {
            // Randomly choose whether to apply the NoContraction decoration to
            // this arithmetic instruction.
            if (GetFuzzerContext()->ChoosePercentage(
                    GetFuzzerContext()
                        ->GetChanceOfAddingNoContractionDecoration())) {
              TransformationAddNoContractionDecoration transformation(
                  inst.result_id());
              ApplyTransformation(transformation);
            }
          }
        }
      }
    }
  }
  
  }  // namespace fuzz
  }  // namespace spvtools
  