/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
#pragma once

#if ENABLE(DFG_JIT)

namespace JSC { namespace DFG {

// Tells you if an operation that filters type (i.e. does a type check/speculation) will always
// exit. Formally, this means that the proven type of a value prior to the filter was not
// bottom (i.e. not "clear" or "SpecEmpty") but becomes bottom as a result of executing the
// filter.
//
// Note that per this definition, a filter will not return Contradiction if the node's proven
// type was already bottom. This is necessary because we have this yucky convention of using
// a proven type of bottom for nodes that don't hold JS values, like Phi nodes in ThreadedCPS
// and storage nodes.
enum FiltrationResult {
    // Means that this operation may not always exit.
    FiltrationOK,
    
    // Means that this operation will always exit.
    Contradiction
};

} } // namespace JSC::DFG

#endif // ENABLE(DFG_JIT)