1 /* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package com.sun.tools.sjavac.comp.dependencies; 26 27 import java.util.HashSet; 28 import java.util.Set; 29 30 import com.sun.tools.javac.code.Symbol; 31 import com.sun.tools.javac.code.Symbol.ClassSymbol; 32 import com.sun.tools.javac.code.Symbol.PackageSymbol; 33 import com.sun.tools.javac.code.Type; 34 import com.sun.tools.javac.code.TypeTag; 35 import com.sun.tools.javac.tree.JCTree.JCFieldAccess; 36 import com.sun.tools.javac.tree.JCTree.JCIdent; 37 import com.sun.tools.javac.tree.TreeScanner; 38 39 class DependencyScanner extends TreeScanner { 40 41 public final Set<Dependency> dependencies = new HashSet<>(); 42 43 private boolean isValidDependency(Type t) { 44 if (t == null || t.isPrimitiveOrVoid() || t.isErroneous()) 45 return false; 46 TypeTag tag = t.getTag(); 47 return tag != TypeTag.PACKAGE 48 && tag != TypeTag.METHOD 49 && tag != TypeTag.ARRAY 50 && tag != TypeTag.TYPEVAR; 51 } 52 53 @Override 54 public void visitIdent(JCIdent tree) { 55 if (isValidDependency(tree.type)) 56 dependencies.add(new TypeAndSupertypesDependency(tree.type.tsym)); 57 super.visitIdent(tree); 58 } 59 60 @Override 61 public void visitSelect(JCFieldAccess tree) { 62 if (tree.getIdentifier().contentEquals("*")) { 63 Symbol sym = tree.selected instanceof JCIdent ? ((JCIdent) tree.selected).sym 64 : ((JCFieldAccess) tree.selected).sym; 65 if (sym instanceof ClassSymbol) { 66 ClassSymbol clsSym = (ClassSymbol) sym; 67 dependencies.add(new TypeAndSupertypesDependency(clsSym.type.tsym)); 68 } else { 69 dependencies.add(new PackageDependency((PackageSymbol) sym)); 70 } 71 } else if (tree.type != null && tree.type.hasTag(TypeTag.METHOD)) { // Method call? Depend on the result (even though we never access it elsewhere) 72 Type retType = tree.type.getReturnType(); 73 if (isValidDependency(retType)) 74 dependencies.add(new TypeAndSupertypesDependency(retType.tsym)); 75 } else if (isValidDependency(tree.type)) { 76 dependencies.add(new TypeAndSupertypesDependency(tree.type.tsym)); 77 } 78 super.visitSelect(tree); 79 } 80 81 public Set<Dependency> getResult() { 82 return dependencies; 83 } 84 }