1 /*
   2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  *   - Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  *
  11  *   - Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  *
  15  *   - Neither the name of Oracle nor the names of its
  16  *     contributors may be used to endorse or promote products derived
  17  *     from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  20  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 
  32 /**
  33  * Nashorn project uses "final" modifier for method parameters
  34  * (like 'val' of Scala). This tool finds method parameters that
  35  * miss final modifier.
  36  */
  37 
  38 // Usage: jjs -J-Djava.ext.dirs=<your_nashorn_jar_dir> find_nonfinals.js
  39 
  40 var Class = Java.type("java.lang.Class");
  41 var System = Java.type("java.lang.System");
  42 var Thread = Java.type("java.lang.Thread");
  43 var File = Java.type("java.io.File");
  44 var JarFile = Java.type("java.util.jar.JarFile");
  45 var Modifier = Java.type("java.lang.reflect.Modifier");
  46 
  47 // locate nashorn.jar from java.ext.dirs
  48 function findNashorn() {
  49     var paths = System.getProperty("java.ext.dirs").split(File.pathSeparator);
  50     for each (var p in paths) {
  51         var nashorn = p + File.separator + "nashorn.jar";
  52         if (new File(nashorn).exists()) {
  53             return nashorn;
  54         }
  55     }
  56 }
  57 
  58 // analyze a single Class and print info on non-final parameters
  59 function analyzeClass(cls) {
  60     var methods = cls.getDeclaredMethods();
  61     for each (var method in methods) {
  62         var methodModifiers = method.modifiers;
  63         if (Modifier.isAbstract(methodModifiers) || Modifier.isNative(methodModifiers)) {
  64             continue;
  65         }
  66         // this requires -parameters option when compiling java sources
  67         var params = method.parameters;
  68         for each (var p in params) {
  69            var modifiers = p.modifiers;
  70            if (!Modifier.isFinal(modifiers)) {
  71                if (! method.name.startsWith("access$")) {
  72                    print(method);
  73                    print(" ->", p);
  74                }
  75            }
  76         }
  77     }
  78 }
  79 
  80 var jarFile = findNashorn();
  81 var ctxtLoader = Thread.currentThread().contextClassLoader;
  82 
  83 // load each class and use reflection to analyze each Class
  84 new JarFile(jarFile).stream().forEach(
  85     function(entry) {
  86         var name = entry.name;
  87         if (name.endsWith(".class")) {
  88             var clsName = name.substring(0, name.lastIndexOf('.class'));
  89             clsName = clsName.replace(/\//g, '.');
  90             try {
  91                 // don't initialize to avoid for possible initialization errors 
  92                 var cls = Class.forName(clsName, false, ctxtLoader);
  93                 analyzeClass(cls);
  94             } catch (e) {
  95                 // print exception and continue analysis for other classes
  96                 print("Failed to analyze " + clsName);
  97                 e.printStackTrace();
  98             }
  99         }
 100     }
 101 )