1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/src/share/classes/com/sun/tools/javac/jvm/LVTRanges.java Sat Sep 14 19:04:47 2013 +0100 1.3 @@ -0,0 +1,129 @@ 1.4 +/* 1.5 + * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. 1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 1.7 + * 1.8 + * This code is free software; you can redistribute it and/or modify it 1.9 + * under the terms of the GNU General Public License version 2 only, as 1.10 + * published by the Free Software Foundation. Oracle designates this 1.11 + * particular file as subject to the "Classpath" exception as provided 1.12 + * by Oracle in the LICENSE file that accompanied this code. 1.13 + * 1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT 1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1.17 + * version 2 for more details (a copy is included in the LICENSE file that 1.18 + * accompanied this code). 1.19 + * 1.20 + * You should have received a copy of the GNU General Public License version 1.21 + * 2 along with this work; if not, write to the Free Software Foundation, 1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1.23 + * 1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 1.25 + * or visit www.oracle.com if you need additional information or have any 1.26 + * questions. 1.27 + */ 1.28 + 1.29 +package com.sun.tools.javac.jvm; 1.30 + 1.31 +import java.util.Map; 1.32 +import java.util.Map.Entry; 1.33 +import java.util.WeakHashMap; 1.34 + 1.35 +import com.sun.tools.javac.code.Symbol.MethodSymbol; 1.36 +import com.sun.tools.javac.code.Symbol.VarSymbol; 1.37 +import com.sun.tools.javac.tree.JCTree; 1.38 +import com.sun.tools.javac.util.Context; 1.39 +import com.sun.tools.javac.util.List; 1.40 + 1.41 +/** This class contains a one to many relation between a tree and a set of variables. 1.42 + * The relation implies that the given tree closes the DA (definite assignment) 1.43 + * range for the set of variables. 1.44 + * 1.45 + * <p><b>This is NOT part of any supported API. 1.46 + * If you write code that depends on this, you do so at your own risk. 1.47 + * This code and its internal interfaces are subject to change or 1.48 + * deletion without notice.</b> 1.49 + */ 1.50 +public class LVTRanges { 1.51 + /** The context key for the LVT ranges. */ 1.52 + protected static final Context.Key<LVTRanges> lvtRangesKey = new Context.Key<>(); 1.53 + 1.54 + /** Get the LVTRanges instance for this context. */ 1.55 + public static LVTRanges instance(Context context) { 1.56 + LVTRanges instance = context.get(lvtRangesKey); 1.57 + if (instance == null) { 1.58 + instance = new LVTRanges(context); 1.59 + } 1.60 + return instance; 1.61 + } 1.62 + 1.63 + private static final long serialVersionUID = 1812267524140424433L; 1.64 + 1.65 + protected Context context; 1.66 + 1.67 + protected Map<MethodSymbol, Map<JCTree, List<VarSymbol>>> 1.68 + aliveRangeClosingTrees = new WeakHashMap<>(); 1.69 + 1.70 + public LVTRanges(Context context) { 1.71 + this.context = context; 1.72 + context.put(lvtRangesKey, this); 1.73 + } 1.74 + 1.75 + public List<VarSymbol> getVars(MethodSymbol method, JCTree tree) { 1.76 + Map<JCTree, List<VarSymbol>> varMap = aliveRangeClosingTrees.get(method); 1.77 + return (varMap != null) ? varMap.get(tree) : null; 1.78 + } 1.79 + 1.80 + public boolean containsKey(MethodSymbol method, JCTree tree) { 1.81 + Map<JCTree, List<VarSymbol>> varMap = aliveRangeClosingTrees.get(method); 1.82 + if (varMap == null) { 1.83 + return false; 1.84 + } 1.85 + return varMap.containsKey(tree); 1.86 + } 1.87 + 1.88 + public void setEntry(MethodSymbol method, JCTree tree, List<VarSymbol> vars) { 1.89 + Map<JCTree, List<VarSymbol>> varMap = aliveRangeClosingTrees.get(method); 1.90 + if (varMap != null) { 1.91 + varMap.put(tree, vars); 1.92 + } else { 1.93 + varMap = new WeakHashMap<>(); 1.94 + varMap.put(tree, vars); 1.95 + aliveRangeClosingTrees.put(method, varMap); 1.96 + } 1.97 + } 1.98 + 1.99 + public List<VarSymbol> removeEntry(MethodSymbol method, JCTree tree) { 1.100 + Map<JCTree, List<VarSymbol>> varMap = aliveRangeClosingTrees.get(method); 1.101 + if (varMap != null) { 1.102 + List<VarSymbol> result = varMap.remove(tree); 1.103 + if (varMap.isEmpty()) { 1.104 + aliveRangeClosingTrees.remove(method); 1.105 + } 1.106 + return result; 1.107 + } 1.108 + return null; 1.109 + } 1.110 + 1.111 + /* This method should be used for debugging LVT related issues. 1.112 + */ 1.113 + @Override 1.114 + public String toString() { 1.115 + String result = ""; 1.116 + for (Entry<MethodSymbol, Map<JCTree, List<VarSymbol>>> mainEntry: aliveRangeClosingTrees.entrySet()) { 1.117 + result += "Method: \n" + mainEntry.getKey().flatName() + "\n"; 1.118 + int i = 1; 1.119 + for (Entry<JCTree, List<VarSymbol>> treeEntry: mainEntry.getValue().entrySet()) { 1.120 + result += " Tree " + i + ": \n" + treeEntry.getKey().toString() + "\n"; 1.121 + result += " Variables closed:\n"; 1.122 + for (VarSymbol var: treeEntry.getValue()) { 1.123 + result += " " + var.toString(); 1.124 + } 1.125 + result += "\n"; 1.126 + i++; 1.127 + } 1.128 + } 1.129 + return result; 1.130 + } 1.131 + 1.132 +}