Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  */

 /*

  * @test

  * @bug 7017664

  * @summary Basher for CompoundScopes

  */

 import java.util.Random;

 import java.util.Map;

 import java.util.HashMap;

 import com.sun.tools.javac.util.*;

 import com.sun.tools.javac.code.*;

 import com.sun.tools.javac.code.Scope.*;

 import com.sun.tools.javac.code.Symbol.*;

 import com.sun.tools.javac.file.JavacFileManager;

 public class CompoundScopeTest {

     public static void main(String... args) throws Exception {

         new CompoundScopeTest().run(args);

     }

     static final int MAX_SYMBOLS_COUNT = 20;

     static final int PASSES = 10;

     void run(String... args) throws Exception {

         int count = PASSES;

         for (int i = 0; i < args.length; i++) {

             String arg = args[i];

             if (arg.equals("-seed") && (i + 1 < args.length))

                 seed = Long.parseLong(args[++i]);

             else if(arg.equals("-tests") && (i + 1 < args.length))

                 count = Integer.parseInt(args[++i]);

             else

                 throw new Exception("unknown arg: " + arg);

         }

         rgen = new Random(seed);

         for (int i = 0; i < count; i++) {

             Test t = new Test();

             t.run();

         }

         if (errors > 0)

             throw new Exception(errors + " errors found");

     }

     /**

      * Write a message to stderr.

      */

     void log(String msg) {

         System.err.println(msg);

     }

     /**

      * Write an error message to stderr.

      */

     void error(String msg) {

         System.err.println("Error: " + msg);

         errors++;

     }

     Random rgen;

     long seed = 0;

     int errors;

     /** Class to encapsulate a test run. */

     class Test {

         List<Symbol> elems = List.nil();

         Map<Name, List<Symbol>> shadowedMap = new HashMap<Name, List<Symbol>>();

         /** Run the test. */

         void run() throws Exception {

             log ("starting test");

             setup();

             Scope[] scopes = { createScope(rgen.nextInt(MAX_SYMBOLS_COUNT)),

                                createScope(rgen.nextInt(MAX_SYMBOLS_COUNT)),

                                createScope(rgen.nextInt(MAX_SYMBOLS_COUNT)) };

             boolean[][] scopeNesting = { {false, true, false, true},

                                    {false, true, true, true},

                                    {false, false, true, true} };

             /**

              * We want to generate (and check) the following compound scopes:

              * C1 = C(S1, S2, S3)

              * C2 = C((S1, S2), S3)

              * C3 = C(S1, (S2, S3))

              * C3 = C(C(S1, S2, S3))

              */

             for (int i = 0 ; i < 4 ; i ++) {

                 CompoundScope root = new CompoundScope(symtab.noSymbol);

                 CompoundScope sub = new CompoundScope(symtab.noSymbol);

                 boolean subAdded = false;

                 for (int sc = 0 ; sc < 3 ; sc ++) {

                     if (scopeNesting[sc][i]) {

                         sub.addSubScope(scopes[sc]);

                         if (!subAdded) {

                             root.addSubScope(sub);

                             subAdded = true;

                         }

                     } else {

                         root.addSubScope(scopes[sc]);

                     }

                 }

                 log("testing scope: " + root);

                 checkElems(root);

                 checkShadowed(root);

             }

         }

         /**

          * Create a scope containing a given number of synthetic symbols

          */

         Scope createScope(int nelems) {

             Scope s = new Scope(symtab.noSymbol);

             for (int i = 0 ; i < nelems ; i++) {

                 Symbol sym = new TypeSymbol(0, names.fromString("s" + i), null, null);

                 s.enter(sym);

                 elems = elems.prepend(sym);

                 List<Symbol> shadowed = shadowedMap.get(sym.name);

                 if (shadowed == null) {

                     shadowed = List.nil();

                 }

                 shadowedMap.put(sym.name, shadowed.prepend(sym));

             }

             return s;

         }

         /**

          * Setup compiler context

          */

         void setup() {

             log ("setup");

             context = new Context();

             JavacFileManager.preRegister(context); // required by ClassReader which is required by Symtab

             names = Names.instance(context);       // Name.Table impls tied to an instance of Names

             symtab = Symtab.instance(context);

         }

         /**

          * Check that CompoundScope.getElements() correctly visits all symbols

          * in all subscopes (in the correct order)

          */

         void checkElems(CompoundScope cs) {

             List<Symbol> allSymbols = elems;

             int count = 0;

             for (Symbol s : cs.getElements()) {

                 checkSameSymbols(s, allSymbols.head);

                 allSymbols = allSymbols.tail;

                 count++;

             }

             if (count != elems.size()) {

                 error("CompoundScope.getElements() did not returned enough symbols");

             }

         }

         /**

          * Check that CompoundScope.getElements() correctly visits all symbols

          * with a given name in all subscopes (in the correct order)

          */

         void checkShadowed(CompoundScope cs) {

             for (Map.Entry<Name, List<Symbol>> shadowedEntry : shadowedMap.entrySet()) {

                 int count = 0;

                 List<Symbol> shadowed = shadowedEntry.getValue();

                 Name name = shadowedEntry.getKey();

                 for (Symbol s : cs.getElementsByName(name)) {

                     checkSameSymbols(s, shadowed.head);

                     shadowed = shadowed.tail;

                     count++;

                 }

                 if (count != shadowedEntry.getValue().size()) {

                     error("CompoundScope.lookup() did not returned enough symbols for name " + name);

                 }

             }

         }

         void checkSameSymbols(Symbol found, Symbol req) {

             if (found != req) {

                 error("Symbol mismatch - found    : " + found + ":" + found.hashCode() + "\n" +

                       "                  required : " + req + ":" + req.hashCode());

             }

         }

         Context context;

         Symtab symtab;

         Names names;

     }

 }