nashorn/samples/find_nonfinals.js
author joehw
Wed, 17 Feb 2016 16:32:51 -0800
changeset 36029 a847c5a7e22d
parent 30984 844283fdfa54
permissions -rw-r--r--
8146237: PREFER from Features API taking precedence over catalog file Reviewed-by: lancea
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/*
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 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 *   - Redistributions of source code must retain the above copyright
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 *     notice, this list of conditions and the following disclaimer.
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 *
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 *   - Redistributions in binary form must reproduce the above copyright
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 *     notice, this list of conditions and the following disclaimer in the
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 *     documentation and/or other materials provided with the distribution.
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 *
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 *   - Neither the name of Oracle nor the names of its
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 *     contributors may be used to endorse or promote products derived
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 *     from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/**
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 * Nashorn project uses "final" modifier for method parameters
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 * (like 'val' of Scala). This tool finds method parameters that
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 * miss final modifier.
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 */
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// Usage: jjs -J-Djava.ext.dirs=<your_nashorn_jar_dir> find_nonfinals.js
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var Class = Java.type("java.lang.Class");
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var System = Java.type("java.lang.System");
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var Thread = Java.type("java.lang.Thread");
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var File = Java.type("java.io.File");
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var JarFile = Java.type("java.util.jar.JarFile");
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var Modifier = Java.type("java.lang.reflect.Modifier");
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// locate nashorn.jar from java.ext.dirs
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function findNashorn() {
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    var paths = System.getProperty("java.ext.dirs").split(File.pathSeparator);
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    for each (var p in paths) {
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        var nashorn = p + File.separator + "nashorn.jar";
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        if (new File(nashorn).exists()) {
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            return nashorn;
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        }
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    }
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}
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// analyze a single Class and print info on non-final parameters
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function analyzeClass(cls) {
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    var methods = cls.getDeclaredMethods();
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    for each (var method in methods) {
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        var methodModifiers = method.modifiers;
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        if (Modifier.isAbstract(methodModifiers) || Modifier.isNative(methodModifiers)) {
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            continue;
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        }
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        // this requires -parameters option when compiling java sources
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        var params = method.parameters;
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        for each (var p in params) {
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           var modifiers = p.modifiers;
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           if (!Modifier.isFinal(modifiers)) {
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               if (! method.name.startsWith("access$")) {
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                   print(method);
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                   print(" ->", p);
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               }
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           }
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        }
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    }
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}
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var jarFile = findNashorn();
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var ctxtLoader = Thread.currentThread().contextClassLoader;
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// load each class and use reflection to analyze each Class
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new JarFile(jarFile).stream().forEach(
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    function(entry) {
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        var name = entry.name;
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        if (name.endsWith(".class")) {
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            var clsName = name.substring(0, name.lastIndexOf('.class'));
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            clsName = clsName.replace(/\//g, '.');
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            try {
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                // don't initialize to avoid for possible initialization errors 
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                var cls = Class.forName(clsName, false, ctxtLoader);
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                analyzeClass(cls);
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            } catch (e) {
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                // print exception and continue analysis for other classes
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                print("Failed to analyze " + clsName);
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                e.printStackTrace();
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            }
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        }
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    }
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)