78 lines
2.8 KiB
C++
78 lines
2.8 KiB
C++
// Copyright 2021 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef FUZZERS_TINT_AST_FUZZER_MUTATION_FINDER_H_
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#define FUZZERS_TINT_AST_FUZZER_MUTATION_FINDER_H_
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#include <memory>
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#include <vector>
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#include "fuzzers/tint_ast_fuzzer/mutation.h"
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#include "fuzzers/tint_ast_fuzzer/node_id_map.h"
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#include "fuzzers/tint_ast_fuzzer/probability_context.h"
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#include "src/program.h"
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namespace tint {
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namespace fuzzers {
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namespace ast_fuzzer {
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/// Instances of this class traverse the `tint::Program`, looking for
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/// opportunities to apply mutations and return them to the caller.
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///
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/// Ideally, the behaviour of this class (precisely, its `FindMutations` method)
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/// should not be probabilistic. This is useful when mutation finders are used
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/// for test case reduction, because it enables the test case reducer to
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/// systematically explore all available mutations. There may be some
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/// exceptions, however. For example, if a huge number of mutations is returned,
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/// it would make sense to apply only a probabilistically selected subset of
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/// them.
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class MutationFinder {
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public:
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/// Virtual destructor.
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virtual ~MutationFinder();
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/// @brief Traverses the `program`, looking for opportunities to apply
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/// mutations.
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///
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/// @param program - the program being fuzzed.
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/// @param node_id_map - a map from `tint::ast::` nodes in the `program` to
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/// their unique ids.
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/// @param probability_context - determines various probabilistic stuff in the
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/// mutator. This should ideally be used as less as possible.
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/// @return all the found mutations.
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virtual MutationList FindMutations(
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const tint::Program& program,
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NodeIdMap* node_id_map,
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ProbabilityContext* probability_context) const = 0;
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/// @brief Compute a probability of applying a single mutation, returned by
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/// this class.
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///
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/// @param probability_context - contains information about various
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/// non-deterministic stuff in the fuzzer.
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/// @return a number in the range [0; 100] which is a chance of applying a
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/// mutation.
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virtual uint32_t GetChanceOfApplyingMutation(
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ProbabilityContext* probability_context) const = 0;
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};
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using MutationFinderList = std::vector<std::unique_ptr<MutationFinder>>;
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} // namespace ast_fuzzer
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} // namespace fuzzers
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} // namespace tint
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#endif // FUZZERS_TINT_AST_FUZZER_MUTATION_FINDER_H_
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