nashorn/samples/getclassnpe.js
author ddmitriev
Wed, 21 Sep 2016 16:46:13 +0300
changeset 41292 08bd6740b8e3
parent 28878 838f91fb6e9c
permissions -rw-r--r--
8150758: [TESTBUG] need jvmti tests for module aware agents Reviewed-by: sspitsyn, dsamersoff
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#// Usage: jjs getclassnpe.js -- <directory>
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/*
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 * Copyright (c) 2015, 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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 * java.lang.Object.getClass() is sometimes used to do null check. This
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 * obfuscating Object.getClass() check relies on non-related intrinsic
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 * performance, which is potentially not available everywhere.
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 * See also http://cr.openjdk.java.net/~shade/scratch/NullChecks.java
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 * This nashorn script checks for such uses in your .java files in the
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 * given directory (recursively).
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 */
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if (arguments.length == 0) {
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    print("Usage: jjs getclassnpe.js -- <directory>");
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    exit(1);
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}
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// Java types used
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var File = Java.type("java.io.File");
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var Files = Java.type("java.nio.file.Files");
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var StringArray = Java.type("java.lang.String[]");
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var ToolProvider = Java.type("javax.tools.ToolProvider");
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var MethodInvocationTree = Java.type("com.sun.source.tree.MethodInvocationTree");
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var TreeScanner = Java.type("com.sun.source.util.TreeScanner");
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// parse a specific .java file to check if it uses
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// Object.getClass() for null check.
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function checkGetClassNPE() {
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    // get the system compiler tool
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    var compiler = ToolProvider.systemJavaCompiler;
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    // get standard file manager
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    var fileMgr = compiler.getStandardFileManager(null, null, null);
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    // Using Java.to convert script array (arguments) to a Java String[]
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    var compUnits = fileMgr.getJavaFileObjects(
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        Java.to(arguments, StringArray));
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    // create a new compilation task
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    var task = compiler.getTask(null, fileMgr, null, null, null, compUnits);
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    // subclass SimpleTreeVisitor - to check for obj.getClass(); statements
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    var GetClassNPEChecker = Java.extend(TreeScanner);
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    var visitor = new GetClassNPEChecker() {
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        lineMap: null,
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        sourceFile: null,
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        // save compilation unit details for reporting
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        visitCompilationUnit: function(node, p) {
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           this.sourceFile = node.sourceFile;
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           this.lineMap = node.lineMap;
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           return Java.super(visitor).visitCompilationUnit(node, p);
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        },
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        // look for "foo.getClass();" expression statements
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        visitExpressionStatement: function(node, p) {
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            var expr = node.expression;
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            if (expr instanceof MethodInvocationTree) {
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                var name = String(expr.methodSelect.identifier);
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                // will match any "getClass" call with zero arguments!
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                if (name == "getClass" && expr.arguments.size() == 0) {
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                    print(this.sourceFile.getName()
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                     + " @ "
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                     + this.lineMap.getLineNumber(node.pos)
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                     + ":"
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                     + this.lineMap.getColumnNumber(node.pos));
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                    print("\t", node);
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                }
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            }
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        }
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    }
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    for each (var cu in task.parse()) {
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        cu.accept(visitor, null);
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    }
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}
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// for each ".java" file in the directory (recursively)
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function main(dir) {
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    Files.walk(dir.toPath()).
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      forEach(function(p) {
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          var name = p.toFile().absolutePath;
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          if (name.endsWith(".java")) {
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              try {
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                  checkGetClassNPE(p.toFile().getAbsolutePath());
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              } catch (e) {
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                  print(e);
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              }
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          }
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      });
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}
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838f91fb6e9c 8071989: NashornScriptEngine returns javax.script.ScriptContext instance with insonsistent get/remove methods behavior for undefined attributes
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main(new File(arguments[0]));