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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_MUTATIONS_DELETE_STATEMENT_H_
#define SRC_TINT_FUZZERS_TINT_AST_FUZZER_MUTATIONS_DELETE_STATEMENT_H_
#include "src/tint/fuzzers/tint_ast_fuzzer/jump_tracker.h"
#include "src/tint/fuzzers/tint_ast_fuzzer/mutation.h"
#include "src/tint/lang/wgsl/ast/statement.h"
namespace tint::fuzzers::ast_fuzzer {
/// @see MutationDeleteStatement::Apply
class MutationDeleteStatement : public Mutation {
public:
/// @brief Constructs an instance of this mutation from a protobuf message.
/// @param message - protobuf message
explicit MutationDeleteStatement(protobufs::MutationDeleteStatement message);
/// @brief Constructor.
/// @param statement_id - the id of the statement to delete.
explicit MutationDeleteStatement(uint32_t statement_id);
/// @copybrief Mutation::IsApplicable
///
/// The mutation is applicable iff:
/// - `statement_id` corresponds to a statement in the AST.
/// - `statement_id` does not refer to a variable declaration, since the declared variables will
/// be inaccessible if the statement is deleted.
/// - `statement_id` is not a return statement, since removing return statements arbitrarily can
/// make the program invalid.
/// - `statement_id` is not a break statement, since removing break statements can lead to
/// syntactically infinite loops.
///
/// @copydetails Mutation::IsApplicable
bool IsApplicable(const tint::Program& program, const NodeIdMap& node_id_map) const override;
/// @copybrief Mutation::Apply
///
/// Delete the statement referenced by `statement_id`.
///
/// @copydetails Mutation::Apply
void Apply(const NodeIdMap& node_id_map,
tint::program::CloneContext& clone_context,
NodeIdMap* new_node_id_map) const override;
protobufs::Mutation ToMessage() const override;
/// Return whether the given statement is suitable for deletion.
/// @param statement_node - the statement to be considered for deletion.
/// @param program - the program containing the statement.
/// @param jump_tracker - information about jump statements for the program.
/// @return true if and only if it is OK to delete the statement.
static bool CanBeDeleted(const ast::Statement& statement_node,
const Program& program,
const JumpTracker& jump_tracker);
private:
protobufs::MutationDeleteStatement message_;
};
} // namespace tint::fuzzers::ast_fuzzer
#endif // SRC_TINT_FUZZERS_TINT_AST_FUZZER_MUTATIONS_DELETE_STATEMENT_H_