| /** |
| * 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 BlockInsertionSet; |
| class Graph; |
| struct BasicBlock; |
| |
| // Inserts dummy basic blocks before any loop headers that don't already have |
| // a single non-loop predecessor. |
| |
| bool performLoopPreHeaderCreation(Graph&); |
| |
| // Creates a new basic block (a pre-header) that jumps to the given block. All |
| // predecessors of the given block that aren't dominated by it are rerouted to |
| // the pre-header. |
| // |
| // This function is used internally and it's used in a surgical fashion by |
| // OSREntrypointCreationPhase. |
| // |
| // Note that executing this function requires having an intact dominators |
| // analysis. You should run that analysis before doing damage to the CFG, even |
| // if said damage is done before you call this. |
| BasicBlock* createPreHeader(Graph&, BlockInsertionSet&, BasicBlock*); |
| |
| } } // namespace JSC::DFG |
| |
| #endif // ENABLE(DFG_JIT) |
