| /* |
| * Copyright 2008 Google Inc. |
| * |
| * 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. |
| */ |
| package com.google.gwt.dev.jjs.impl.gflow.unreachable; |
| |
| import com.google.gwt.dev.jjs.impl.gflow.AssumptionMap; |
| import com.google.gwt.dev.jjs.impl.gflow.AssumptionUtil; |
| import com.google.gwt.dev.jjs.impl.gflow.IntegratedFlowFunction; |
| import com.google.gwt.dev.jjs.impl.gflow.TransformationFunction.Transformation; |
| import com.google.gwt.dev.jjs.impl.gflow.cfg.Cfg; |
| import com.google.gwt.dev.jjs.impl.gflow.cfg.CfgEdge; |
| import com.google.gwt.dev.jjs.impl.gflow.cfg.CfgNode; |
| import com.google.gwt.dev.jjs.impl.gflow.cfg.CfgNopNode; |
| import com.google.gwt.dev.jjs.impl.gflow.cfg.CfgTransformer; |
| |
| /** |
| * |
| */ |
| public class UnreachabeIntegratedTransformationFunction implements |
| IntegratedFlowFunction<CfgNode<?>, CfgEdge, CfgTransformer, Cfg, |
| UnreachableAssumptions> { |
| public Transformation<CfgTransformer, Cfg> |
| interpretOrReplace(CfgNode<?> node, Cfg graph, |
| AssumptionMap<CfgEdge, UnreachableAssumptions> assumptionMap) { |
| UnreachableAssumptions in = AssumptionUtil.join( |
| graph.getInEdges(node), assumptionMap); |
| |
| if (UnreachableAssumptions.isReachable(in)) { |
| AssumptionUtil.setAssumptions(graph.getOutEdges(node), UnreachableAssumptions.REACHABLE, assumptionMap); |
| return null; |
| } |
| |
| if (node instanceof CfgNopNode) { |
| AssumptionUtil.setAssumptions(graph.getOutEdges(node), UnreachableAssumptions.UNREACHABLE, assumptionMap); |
| return null; |
| } |
| |
| return new DeleteNodeTransformation(graph, node); |
| } |
| } |