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// Copyright 2022 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_JUMP_TRACKER_H_
#define SRC_TINT_FUZZERS_TINT_AST_FUZZER_JUMP_TRACKER_H_
#include <unordered_set>
#include "src/tint/ast/statement.h"
#include "src/tint/program.h"
namespace tint::fuzzers::ast_fuzzer {
/// This class computes information on which statements contain loop breaks and returns.
/// It could be extended to handle other jumps, such as switch breaks and loop continues, should
/// such information prove useful.
class JumpTracker {
public:
/// Initializes jump tracking information for the given program.
/// @param program - the program for which jumps will be tracked;
/// must remain in scope as long as this instance exists.
explicit JumpTracker(const Program& program);
/// Indicates whether a statement contains a break statement for the innermost loop (if any).
/// @param statement - the statement of interest.
/// @return true if and only if the statement is, or contains, a break for the innermost
/// enclosing loop.
bool ContainsBreakForInnermostLoop(const ast::Statement& statement) const {
return contains_break_for_innermost_loop_.count(&statement) > 0;
}
/// Indicates whether a statement contains a return statement.
/// @param statement - the statement of interest.
/// @return true if and only if the statement is, or contains, a return statement.
bool ContainsReturn(const ast::Statement& statement) const {
return contains_return_.count(&statement) > 0;
}
private:
std::unordered_set<const ast::Statement*> contains_break_for_innermost_loop_;
std::unordered_set<const ast::Statement*> contains_return_;
};
} // namespace tint::fuzzers::ast_fuzzer
#endif // SRC_TINT_FUZZERS_TINT_AST_FUZZER_JUMP_TRACKER_H_