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// Copyright 2021 The Tint Authors.
//
// 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 SRC_TINT_FUZZERS_TINT_AST_FUZZER_MUTATOR_H_
#define SRC_TINT_FUZZERS_TINT_AST_FUZZER_MUTATOR_H_
#include "src/tint/fuzzers/tint_ast_fuzzer/mutation.h"
#include "src/tint/fuzzers/tint_ast_fuzzer/mutation_finder.h"
#include "src/tint/fuzzers/tint_ast_fuzzer/node_id_map.h"
#include "src/tint/fuzzers/tint_ast_fuzzer/probability_context.h"
#include "src/tint/fuzzers/tint_ast_fuzzer/protobufs/tint_ast_fuzzer.h"
#include "src/tint/lang/wgsl/program/program.h"
namespace tint::fuzzers::ast_fuzzer {
/// @file
/// @brief Tries to apply a `mutation` to the `program`.
///
/// If the `mutation` is inapplicable, this function will return `false` and
/// `out_program`, `out_node_id_map` and `mutation_sequence` won't be modified.
///
/// The `mutation` is required to produce a valid program when the
/// `Mutation::Apply` method is called. This guarantees that this function
/// returns a valid program as well.
///
/// @param program - the initial program (must be valid).
/// @param mutation - the mutation that will be applied.
/// @param node_id_map - a map from `tint::ast::` nodes in the `program` to
/// their unique ids.
/// @param out_program - the resulting mutated program will be written through
/// this pointer. It may *not* be a `nullptr`. It _may_ point to `program`,
/// so that a program can be updated in place.
/// @param out_node_id_map - will contain new ids for the AST nodes in the
/// mutated program. It may *not* be a `nullptr`. It _may_ point to
/// `node_id_map`, so that a map can be updated in place.
/// @param mutation_sequence - the message about this mutation will be recorded
/// here. It may be a `nullptr`, in which case it's ignored.
/// @return `true` if the `mutation` was applied.
/// @return `false` if the `mutation` is inapplicable.
bool MaybeApplyMutation(const tint::Program& program,
const Mutation& mutation,
const NodeIdMap& node_id_map,
tint::Program& out_program,
NodeIdMap* out_node_id_map,
protobufs::MutationSequence* mutation_sequence);
/// @brief Applies mutations from `mutations_sequence` to the `program`.
///
/// All mutations in `mutation_sequence` must be applicable. Additionally, all
/// mutations must produce a valid program when the `Mutation::Apply` method is
/// called. This guarantees that this function returns a valid program as well.
///
/// @param program - the initial program - must be valid.
/// @param mutation_sequence - a sequence of mutations.
/// @return the mutated program.
tint::Program Replay(tint::Program program, const protobufs::MutationSequence& mutation_sequence);
/// @brief Applies up to `max_applied_mutations` mutations to the `program`.
///
/// All applied mutations must produce valid programs. This guarantees that the
/// returned program is valid as well. The returned program may be identical to
/// the initial `program` if no mutation was applied.
///
/// @param program - initial program - must be valid.
/// @param probability_context - contains information about various
/// probabilistic behaviour of the fuzzer.
/// @param enable_all_mutations - if `false`, only mutations from a
/// probabilistically selected set of mutation types are applied. If `true`,
/// all mutation types are considered.
/// @param max_applied_mutations - the maximum number of applied mutations. This
/// may not be 0.
/// @param mutation_sequence - applied mutations will be recorded into this
/// protobuf message. This argument may be `nullptr`, in which case it's
/// ignored.
/// @return the mutated program.
tint::Program Mutate(tint::Program program,
ProbabilityContext* probability_context,
bool enable_all_mutations,
uint32_t max_applied_mutations,
protobufs::MutationSequence* mutation_sequence);
} // namespace tint::fuzzers::ast_fuzzer
#endif // SRC_TINT_FUZZERS_TINT_AST_FUZZER_MUTATOR_H_