| /** |
| * 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) |
