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 40var Class = Java.type("java.lang.Class"); 41var System = Java.type("java.lang.System"); 42var Thread = Java.type("java.lang.Thread"); 43var File = Java.type("java.io.File"); 44var JarFile = Java.type("java.util.jar.JarFile"); 45var Modifier = Java.type("java.lang.reflect.Modifier"); 46 47// locate nashorn.jar from java.ext.dirs 48function 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 59function 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 80var jarFile = findNashorn(); 81var ctxtLoader = Thread.currentThread().contextClassLoader; 82 83// load each class and use reflection to analyze each Class 84new 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) 102