1 /*
   2  * Copyright (c) 2011, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 7021183 7025809
  27  * @summary 269: assertion failure getting enclosing element of an undefined name
  28  */
  29 
  30 import java.lang.reflect.Field;
  31 import javax.lang.model.element.Element;
  32 import javax.lang.model.element.ExecutableElement;
  33 import javax.lang.model.element.PackageElement;
  34 import javax.lang.model.element.TypeElement;
  35 import javax.lang.model.element.TypeParameterElement;
  36 import javax.lang.model.element.UnknownElementException;
  37 import javax.lang.model.element.VariableElement;
  38 import javax.lang.model.type.TypeMirror;
  39 import javax.lang.model.type.UnknownTypeException;
  40 import javax.lang.model.util.*;
  41 
  42 import com.sun.tools.javac.code.Symbol.ClassSymbol;
  43 import com.sun.tools.javac.code.Symtab;
  44 import com.sun.tools.javac.file.JavacFileManager;
  45 import com.sun.tools.javac.main.JavaCompiler;
  46 import com.sun.tools.javac.model.JavacTypes;
  47 import com.sun.tools.javac.util.Context;
  48 
  49 /**
  50  * Scan javac Symtab looking for TypeMirrors and Elements, and ensure that
  51  * no exceptions are thrown when used with javax.lang.model visitors.
  52  *
  53  */
  54 public class TestSymtabItems {
  55     public static void main(String... args) throws Exception {
  56         new TestSymtabItems().run();
  57     }
  58 
  59     void run() throws Exception {
  60         Context c = new Context();
  61         JavacFileManager.preRegister(c);
  62         Symtab syms = Symtab.instance(c);
  63         JavacTypes types = JavacTypes.instance(c);
  64         JavaCompiler.instance(c);  // will init ClassReader.sourceCompleter
  65 
  66 //        print("noSymbol", syms.noSymbol);
  67 //        print("errSymbol", syms.errSymbol);
  68 //        print("unknownSymbol", syms.unknownSymbol);
  69 //        print("botType", syms.botType);
  70 //        print("errType", syms.errType);
  71 //        print("unknownType", syms.unknownType);
  72 
  73         for (Field f: Symtab.class.getDeclaredFields()) {
  74 //            System.err.println(f.getType() + " " + f.getName());
  75 
  76             // Temporarily ignore methodHandle and transientMethodHandle
  77             // during API evolution
  78             if (f.getName().toLowerCase().contains("methodhandle"))
  79                 continue;
  80 
  81             Class<?> ft = f.getType();
  82             if (TypeMirror.class.isAssignableFrom(ft))
  83                 print(f.getName(), (TypeMirror) f.get(syms), types);
  84             else if(Element.class.isAssignableFrom(ft))
  85                 print(f.getName(), (Element) f.get(syms));
  86         }
  87 
  88         if (errors > 0)
  89             throw new Exception(errors + " errors occurred");
  90     }
  91 
  92     void print(String label, Element e) {
  93         ElemPrinter ep = new ElemPrinter();
  94         System.err.println("Test " + label);
  95         ep.visit(e);
  96         System.err.println();
  97     }
  98 
  99     void print(String label, TypeMirror t, Types types) {
 100         TypePrinter tp = new TypePrinter();
 101         System.err.println("Test " + label);
 102         tp.visit(t, types);
 103         System.err.println();
 104     }
 105 
 106     void error(String msg) {
 107         System.err.println("Error: " + msg);
 108         errors++;
 109     }
 110 
 111     int errors;
 112 
 113     class ElemPrinter extends ElementScanner8<Void, Void> {
 114         @Override
 115         public Void visitPackage(PackageElement e, Void p) {
 116             show("package", e);
 117             indent(+1);
 118             super.visitPackage(e, p);
 119             indent(-1);
 120             return null;
 121         }
 122 
 123         @Override
 124         public Void visitType(TypeElement e, Void p) {
 125             show("type", e);
 126             indent(+1);
 127             super.visitType(e, p);
 128             indent(-1);
 129             return null;
 130         }
 131 
 132         @Override
 133         public Void visitVariable(VariableElement e, Void p) {
 134             show("variable", e);
 135             indent(+1);
 136             super.visitVariable(e, p);
 137             indent(-1);
 138             return null;
 139         }
 140 
 141         @Override
 142         public Void visitExecutable(ExecutableElement e, Void p) {
 143             show("executable", e);
 144             indent(+1);
 145             super.visitExecutable(e, p);
 146             indent(-1);
 147             return null;
 148         }
 149 
 150         @Override
 151         public Void visitTypeParameter(TypeParameterElement e, Void p) {
 152             show("type parameter", e);
 153             indent(+1);
 154             super.visitTypeParameter(e, p);
 155             indent(-1);
 156             return null;
 157         }
 158 
 159         @Override
 160         public Void visitUnknown(Element e, Void p) {
 161             show("unknown", e);
 162             indent(+1);
 163             try {
 164                 super.visitUnknown(e, p);
 165             } catch (UnknownElementException ex) {
 166                 System.err.println("caught " + ex);
 167             }
 168             indent(-1);
 169             return null;
 170         }
 171 
 172         void indent(int i) {
 173             indent += i;
 174         }
 175 
 176         String sp(int w) {
 177             StringBuilder sb = new StringBuilder();
 178             for (int i = 0; i < w; i++)
 179                 sb.append("    ");
 180             return sb.toString();
 181         }
 182 
 183         void show(String label, Element e) {
 184             System.err.println(sp(indent) + label
 185                     + ": mods:" + e.getModifiers()
 186                     + " " + e.getSimpleName()
 187                     + ", kind: " + e.getKind()
 188                     + ", type: " + e.asType()
 189                     + ", encl: " + e.getEnclosingElement());
 190 
 191             // The following checks help establish why NPE might occur when trying to scan children
 192             if (e instanceof ClassSymbol) {
 193                 ClassSymbol csym = (ClassSymbol) e;
 194                 if (csym.members_field == null)
 195                     error("members_field is null");
 196                 if (csym.type == null)
 197                     System.err.println("type is null");
 198             }
 199         }
 200 
 201         int indent;
 202     };
 203 
 204     class TypePrinter extends SimpleTypeVisitor7<Void, Types> {
 205         @Override
 206         public Void defaultAction(TypeMirror m, Types types) {
 207             System.err.println(m.getKind() + " " + m + " " + types.asElement(m));
 208             return null;
 209         }
 210 
 211         @Override
 212         public Void visitUnknown(TypeMirror t, Types types) {
 213             try {
 214                 return super.visitUnknown(t, types);
 215             } catch (UnknownTypeException ex) {
 216                 System.err.println("caught " + ex);
 217                 return null;
 218             }
 219         }
 220     };
 221 }