| /* |
| * 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.liveness; |
| |
| import com.google.gwt.dev.jjs.ast.JLocal; |
| import com.google.gwt.dev.jjs.ast.JParameter; |
| import com.google.gwt.dev.jjs.ast.JVariable; |
| 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.FlowFunction; |
| 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.CfgReadNode; |
| import com.google.gwt.dev.jjs.impl.gflow.cfg.CfgReadWriteNode; |
| import com.google.gwt.dev.jjs.impl.gflow.cfg.CfgVisitor; |
| import com.google.gwt.dev.jjs.impl.gflow.cfg.CfgWriteNode; |
| import com.google.gwt.dev.jjs.impl.gflow.liveness.LivenessAssumption.Updater; |
| |
| /** |
| * Flow function for Liveness Analysis. |
| */ |
| public class LivenessFlowFunction implements FlowFunction<CfgNode<?>, CfgEdge, |
| Cfg, LivenessAssumption> { |
| public void interpret(CfgNode<?> node, Cfg g, |
| AssumptionMap<CfgEdge, LivenessAssumption> assumptionMap) { |
| final Updater result = new Updater( |
| AssumptionUtil.join(g.getOutEdges(node), assumptionMap)); |
| |
| node.accept(new CfgVisitor() { |
| @Override |
| public void visitReadNode(CfgReadNode node) { |
| JVariable target = node.getTarget(); |
| if (target instanceof JLocal || target instanceof JParameter) { |
| result.use(target); |
| } |
| } |
| |
| @Override |
| public void visitReadWriteNode(CfgReadWriteNode node) { |
| JVariable target = node.getTargetVariable(); |
| if (target instanceof JLocal || target instanceof JParameter) { |
| result.use(target); |
| } |
| } |
| |
| @Override |
| public void visitWriteNode(CfgWriteNode node) { |
| JVariable target = node.getTargetVariable(); |
| if (target instanceof JLocal || target instanceof JParameter) { |
| result.kill(target); |
| } |
| } |
| }); |
| |
| AssumptionUtil.setAssumptions(g.getInEdges(node), result.unwrap(), assumptionMap); |
| } |
| } |