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// Copyright (c) 2020 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/pass_management/repeated_pass_manager_random_with_recommendations.h"
namespace spvtools {
namespace fuzz {
RepeatedPassManagerRandomWithRecommendations::
RepeatedPassManagerRandomWithRecommendations(
FuzzerContext* fuzzer_context, RepeatedPassInstances* pass_instances,
RepeatedPassRecommender* pass_recommender)
: RepeatedPassManager(fuzzer_context, pass_instances),
pass_recommender_(pass_recommender),
num_transformations_applied_before_last_pass_choice_(0),
last_pass_choice_(nullptr) {}
RepeatedPassManagerRandomWithRecommendations::
~RepeatedPassManagerRandomWithRecommendations() = default;
FuzzerPass* RepeatedPassManagerRandomWithRecommendations::ChoosePass(
const protobufs::TransformationSequence& applied_transformations) {
assert(static_cast<uint32_t>(applied_transformations.transformation_size()) >=
num_transformations_applied_before_last_pass_choice_ &&
"The number of applied transformations should not decrease.");
if (last_pass_choice_ != nullptr &&
static_cast<uint32_t>(applied_transformations.transformation_size()) >
num_transformations_applied_before_last_pass_choice_) {
// The last pass had some effect, so we make future recommendations based on
// it.
for (auto future_pass :
pass_recommender_->GetFuturePassRecommendations(*last_pass_choice_)) {
recommended_passes_.push_back(future_pass);
}
}
FuzzerPass* result;
if (recommended_passes_.empty() || GetFuzzerContext()->ChooseEven()) {
auto& passes = GetPassInstances()->GetPasses();
result = passes[GetFuzzerContext()->RandomIndex(passes)].get();
} else {
result = recommended_passes_.front();
recommended_passes_.pop_front();
}
assert(result != nullptr && "A pass must have been chosen.");
last_pass_choice_ = result;
return result;
}
} // namespace fuzz
} // namespace spvtools
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