Mercurial > jdk8-mips64-public > nashorn / file revision

 #// Usage: jjs exceptionswallow.js -- <directory>

 /*

  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met:

  *

  *   - Redistributions of source code must retain the above copyright

  *     notice, this list of conditions and the following disclaimer.

  *

  *   - Redistributions in binary form must reproduce the above copyright

  *     notice, this list of conditions and the following disclaimer in the

  *     documentation and/or other materials provided with the distribution.

  *

  *   - Neither the name of Oracle nor the names of its

  *     contributors may be used to endorse or promote products derived

  *     from this software without specific prior written permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  */

 // This example demonstrates Java subclassing by Java.extend

 // and javac Compiler and Tree API. This example looks for

 // empty catch blocks ("exception swallow") and reports those.

 if (arguments.length == 0) {

     print("Usage: jjs exceptionswallow.js -- <directory>");

     exit(1);

 }

 // Java types used

 var File = Java.type("java.io.File");

 var Files = Java.type("java.nio.file.Files");

 var StringArray = Java.type("java.lang.String[]");

 var ToolProvider = Java.type("javax.tools.ToolProvider");

 var Tree = Java.type("com.sun.source.tree.Tree");

 var EmptyStatementTree = Java.type("com.sun.source.tree.EmptyStatementTree");

 var Trees = Java.type("com.sun.source.util.Trees");

 var TreeScanner = Java.type("com.sun.source.util.TreeScanner");

 // printEmptyCatch

 function printEmptyCatch() {

     // get the system compiler tool

     var compiler = ToolProvider.systemJavaCompiler;

     // get standard file manager

     var fileMgr = compiler.getStandardFileManager(null, null, null);

     // Using Java.to convert script array (arguments) to a Java String[]

     var compUnits = fileMgr.getJavaFileObjects(

         Java.to(arguments, StringArray));

     // create a new compilation task

     var task = compiler.getTask(null, fileMgr, null, null, null, compUnits);

     // SourcePositions object to get positions of AST nodes

     var sourcePositions = Trees.instance(task).sourcePositions;

     // subclass SimpleTreeVisitor - to print empty catch

     var EmptyCatchFinder = Java.extend(TreeScanner);

     function hasOnlyEmptyStats(stats) {

         var itr = stats.iterator();

         while (itr.hasNext()) {

             if (! (itr.next() instanceof EmptyStatementTree)) {

                 return false;

             }

         }

         return true;

     }

     var visitor = new EmptyCatchFinder() {

         // current CompilationUnitTree

         compUnit: null,

         // current LineMap (pos -> line, column)

         lineMap: null,

         // current compilation unit's file name

         fileName: null,

         // overrides of TreeScanner methods

         visitCompilationUnit: function(node, p) {

             // capture info about current Compilation unit

             this.compUnit = node;

             this.lineMap = node.lineMap;

             this.fileName = node.sourceFile.name;

             // Using Java.super API to call super class method here

             return Java.super(visitor).visitCompilationUnit(node, p);

         },

         visitCatch: function (node, p) {

             var stats = node.block.statements;

             if (stats.empty || hasOnlyEmptyStats(stats)) {

                 // print information on this empty catch

                 var pos = sourcePositions.getStartPosition(this.compUnit, node);

                 var line = this.lineMap.getLineNumber(pos);

                 var col = this.lineMap.getColumnNumber(pos);

                 print("Exception swallow" + " @ " + this.fileName + ":" + line + ":" + col);

                 // print(node);

             }

         }

     }

     for each (var cu in task.parse()) {

         cu.accept(visitor, null);

     }

 }

 // for each ".java" file in directory (recursively) and check it!

 function main(dir) {

     Files.walk(dir.toPath()).

       forEach(function(p) {

         var name = p.toFile().absolutePath;

         if (name.endsWith(".java")) {

             try {

                 printEmptyCatch(p.toFile().getAbsolutePath());

             } catch (e) {

                 print(e);

             }

         }

       });

 }

 main(new File(arguments[0]));