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 )