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 File = Java.type("java.io.File");
  43 var JarFile = Java.type("java.util.jar.JarFile");
  44 var Modifier = Java.type("java.lang.reflect.Modifier");
  45 
  46 // locate nashorn.jar from java.ext.dirs
  47 function findNashorn() {
  48     var paths = System.getProperty("java.ext.dirs").split(':');
  49     for each (var p in paths) {
  50         var nashorn = p + File.separator + "nashorn.jar";
  51         if (new File(nashorn).exists()) {
  52             return nashorn;
  53         }
  54     }
  55 }
  56 
  57 // analyze a single Class and print info on non-final parameters
  58 function analyzeClass(cls) {
  59     var methods = cls.getDeclaredMethods();
  60     for each (var method in methods) {
  61         // this requires -parameters option when compiling java sources
  62         var params = method.parameters;
  63         for each (var p in params) {
  64            var modifiers = p.modifiers;
  65            if (!Modifier.isFinal(modifiers)) {
  66                if (! method.name.startsWith("access$")) {
  67                    print(method);
  68                    print(" ->", p);
  69                }
  70            }
  71         }
  72     }
  73 }
  74 
  75 var jarFile = findNashorn();
  76 // load each class and use reflection to analyze each Class
  77 new JarFile(jarFile).stream().forEach(
  78     function(entry) {
  79         var name = entry.name;
  80         if (name.endsWith(".class")) {
  81             var clsName = name.substring(0, name.lastIndexOf('.class'));
  82             clsName = clsName.replace(/\//g, '.');
  83             var cls = Class.forName(clsName);
  84             analyzeClass(cls);
  85         }
  86     }
  87 )