| /** |
| * 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 { |
| |
| class Graph; |
| |
| // Registers any structures we know about as weak references, and sets watchpoints on any |
| // such structures that we know of that are currently watchable. It's somewhat |
| // counterintuitive, but this ends up being the cleanest and most effective way of reducing |
| // structure checks on terminal structures: |
| // |
| // - We used to only set watchpoints on watchable structures if we knew that this would |
| // remove a structure check. Experiments show that switching from that, to blindly |
| // setting watchpoints on all watchable structures, was not a regression. |
| // |
| // - It makes abstract interpretation a whole lot easier. We just assume that watchable |
| // structures are unclobberable without having to do any other logic. |
| |
| bool performStructureRegistration(Graph&); |
| |
| } } // namespace JSC::DFG |
| |
| #endif // ENABLE(DFG_JIT) |
