1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/samples/exceptionswallow.js Tue Sep 15 16:17:33 2015 +0530
1.3 @@ -0,0 +1,136 @@
1.4 +#// Usage: jjs exceptionswallow.js -- <directory>
1.5 +
1.6 +/*
1.7 + * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
1.8 + *
1.9 + * Redistribution and use in source and binary forms, with or without
1.10 + * modification, are permitted provided that the following conditions
1.11 + * are met:
1.12 + *
1.13 + * - Redistributions of source code must retain the above copyright
1.14 + * notice, this list of conditions and the following disclaimer.
1.15 + *
1.16 + * - Redistributions in binary form must reproduce the above copyright
1.17 + * notice, this list of conditions and the following disclaimer in the
1.18 + * documentation and/or other materials provided with the distribution.
1.19 + *
1.20 + * - Neither the name of Oracle nor the names of its
1.21 + * contributors may be used to endorse or promote products derived
1.22 + * from this software without specific prior written permission.
1.23 + *
1.24 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
1.25 + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
1.26 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1.27 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
1.28 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
1.29 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
1.30 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
1.31 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
1.32 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
1.33 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
1.34 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.35 + */
1.36 +
1.37 +// This example demonstrates Java subclassing by Java.extend
1.38 +// and javac Compiler and Tree API. This example looks for
1.39 +// empty catch blocks ("exception swallow") and reports those.
1.40 +
1.41 +if (arguments.length == 0) {
1.42 + print("Usage: jjs exceptionswallow.js -- <directory>");
1.43 + exit(1);
1.44 +}
1.45 +
1.46 +// Java types used
1.47 +var File = Java.type("java.io.File");
1.48 +var Files = Java.type("java.nio.file.Files");
1.49 +var StringArray = Java.type("java.lang.String[]");
1.50 +var ToolProvider = Java.type("javax.tools.ToolProvider");
1.51 +var Tree = Java.type("com.sun.source.tree.Tree");
1.52 +var EmptyStatementTree = Java.type("com.sun.source.tree.EmptyStatementTree");
1.53 +var Trees = Java.type("com.sun.source.util.Trees");
1.54 +var TreeScanner = Java.type("com.sun.source.util.TreeScanner");
1.55 +
1.56 +// printEmptyCatch
1.57 +
1.58 +function printEmptyCatch() {
1.59 + // get the system compiler tool
1.60 + var compiler = ToolProvider.systemJavaCompiler;
1.61 + // get standard file manager
1.62 + var fileMgr = compiler.getStandardFileManager(null, null, null);
1.63 + // Using Java.to convert script array (arguments) to a Java String[]
1.64 + var compUnits = fileMgr.getJavaFileObjects(
1.65 + Java.to(arguments, StringArray));
1.66 + // create a new compilation task
1.67 + var task = compiler.getTask(null, fileMgr, null, null, null, compUnits);
1.68 +
1.69 + // SourcePositions object to get positions of AST nodes
1.70 + var sourcePositions = Trees.instance(task).sourcePositions;
1.71 +
1.72 + // subclass SimpleTreeVisitor - to print empty catch
1.73 + var EmptyCatchFinder = Java.extend(TreeScanner);
1.74 +
1.75 + function hasOnlyEmptyStats(stats) {
1.76 + var itr = stats.iterator();
1.77 + while (itr.hasNext()) {
1.78 + if (! (itr.next() instanceof EmptyStatementTree)) {
1.79 + return false;
1.80 + }
1.81 + }
1.82 +
1.83 + return true;
1.84 + }
1.85 +
1.86 + var visitor = new EmptyCatchFinder() {
1.87 + // current CompilationUnitTree
1.88 + compUnit: null,
1.89 + // current LineMap (pos -> line, column)
1.90 + lineMap: null,
1.91 + // current compilation unit's file name
1.92 + fileName: null,
1.93 +
1.94 + // overrides of TreeScanner methods
1.95 +
1.96 + visitCompilationUnit: function(node, p) {
1.97 + // capture info about current Compilation unit
1.98 + this.compUnit = node;
1.99 + this.lineMap = node.lineMap;
1.100 + this.fileName = node.sourceFile.name;
1.101 +
1.102 + // Using Java.super API to call super class method here
1.103 + return Java.super(visitor).visitCompilationUnit(node, p);
1.104 + },
1.105 +
1.106 + visitCatch: function (node, p) {
1.107 + var stats = node.block.statements;
1.108 + if (stats.empty || hasOnlyEmptyStats(stats)) {
1.109 + // print information on this empty catch
1.110 + var pos = sourcePositions.getStartPosition(this.compUnit, node);
1.111 + var line = this.lineMap.getLineNumber(pos);
1.112 + var col = this.lineMap.getColumnNumber(pos);
1.113 + print("Exception swallow" + " @ " + this.fileName + ":" + line + ":" + col);
1.114 + // print(node);
1.115 + }
1.116 + }
1.117 + }
1.118 +
1.119 + for each (var cu in task.parse()) {
1.120 + cu.accept(visitor, null);
1.121 + }
1.122 +}
1.123 +
1.124 +// for each ".java" file in directory (recursively) and check it!
1.125 +function main(dir) {
1.126 + Files.walk(dir.toPath()).
1.127 + forEach(function(p) {
1.128 + var name = p.toFile().absolutePath;
1.129 + if (name.endsWith(".java")) {
1.130 + try {
1.131 + printEmptyCatch(p.toFile().getAbsolutePath());
1.132 + } catch (e) {
1.133 + print(e);
1.134 + }
1.135 + }
1.136 + });
1.137 +}
1.138 +
1.139 +main(new File(arguments[0]));
