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comparison: samples/exceptionswallow.js
samples/exceptionswallow.js
- changeset 1531
- ab48ce00c634
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| 1 #// Usage: jjs exceptionswallow.js -- <directory> | |
| 2 | |
| 3 /* | |
| 4 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. | |
| 5 * | |
| 6 * Redistribution and use in source and binary forms, with or without | |
| 7 * modification, are permitted provided that the following conditions | |
| 8 * are met: | |
| 9 * | |
| 10 * - Redistributions of source code must retain the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer. | |
| 12 * | |
| 13 * - Redistributions in binary form must reproduce the above copyright | |
| 14 * notice, this list of conditions and the following disclaimer in the | |
| 15 * documentation and/or other materials provided with the distribution. | |
| 16 * | |
| 17 * - Neither the name of Oracle nor the names of its | |
| 18 * contributors may be used to endorse or promote products derived | |
| 19 * from this software without specific prior written permission. | |
| 20 * | |
| 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
| 22 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
| 23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
| 25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 28 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
| 29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
| 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 32 */ | |
| 33 | |
| 34 // This example demonstrates Java subclassing by Java.extend | |
| 35 // and javac Compiler and Tree API. This example looks for | |
| 36 // empty catch blocks ("exception swallow") and reports those. | |
| 37 | |
| 38 if (arguments.length == 0) { | |
| 39 print("Usage: jjs exceptionswallow.js -- <directory>"); | |
| 40 exit(1); | |
| 41 } | |
| 42 | |
| 43 // Java types used | |
| 44 var File = Java.type("java.io.File"); | |
| 45 var Files = Java.type("java.nio.file.Files"); | |
| 46 var StringArray = Java.type("java.lang.String[]"); | |
| 47 var ToolProvider = Java.type("javax.tools.ToolProvider"); | |
| 48 var Tree = Java.type("com.sun.source.tree.Tree"); | |
| 49 var EmptyStatementTree = Java.type("com.sun.source.tree.EmptyStatementTree"); | |
| 50 var Trees = Java.type("com.sun.source.util.Trees"); | |
| 51 var TreeScanner = Java.type("com.sun.source.util.TreeScanner"); | |
| 52 | |
| 53 // printEmptyCatch | |
| 54 | |
| 55 function printEmptyCatch() { | |
| 56 // get the system compiler tool | |
| 57 var compiler = ToolProvider.systemJavaCompiler; | |
| 58 // get standard file manager | |
| 59 var fileMgr = compiler.getStandardFileManager(null, null, null); | |
| 60 // Using Java.to convert script array (arguments) to a Java String[] | |
| 61 var compUnits = fileMgr.getJavaFileObjects( | |
| 62 Java.to(arguments, StringArray)); | |
| 63 // create a new compilation task | |
| 64 var task = compiler.getTask(null, fileMgr, null, null, null, compUnits); | |
| 65 | |
| 66 // SourcePositions object to get positions of AST nodes | |
| 67 var sourcePositions = Trees.instance(task).sourcePositions; | |
| 68 | |
| 69 // subclass SimpleTreeVisitor - to print empty catch | |
| 70 var EmptyCatchFinder = Java.extend(TreeScanner); | |
| 71 | |
| 72 function hasOnlyEmptyStats(stats) { | |
| 73 var itr = stats.iterator(); | |
| 74 while (itr.hasNext()) { | |
| 75 if (! (itr.next() instanceof EmptyStatementTree)) { | |
| 76 return false; | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 return true; | |
| 81 } | |
| 82 | |
| 83 var visitor = new EmptyCatchFinder() { | |
| 84 // current CompilationUnitTree | |
| 85 compUnit: null, | |
| 86 // current LineMap (pos -> line, column) | |
| 87 lineMap: null, | |
| 88 // current compilation unit's file name | |
| 89 fileName: null, | |
| 90 | |
| 91 // overrides of TreeScanner methods | |
| 92 | |
| 93 visitCompilationUnit: function(node, p) { | |
| 94 // capture info about current Compilation unit | |
| 95 this.compUnit = node; | |
| 96 this.lineMap = node.lineMap; | |
| 97 this.fileName = node.sourceFile.name; | |
| 98 | |
| 99 // Using Java.super API to call super class method here | |
| 100 return Java.super(visitor).visitCompilationUnit(node, p); | |
| 101 }, | |
| 102 | |
| 103 visitCatch: function (node, p) { | |
| 104 var stats = node.block.statements; | |
| 105 if (stats.empty || hasOnlyEmptyStats(stats)) { | |
| 106 // print information on this empty catch | |
| 107 var pos = sourcePositions.getStartPosition(this.compUnit, node); | |
| 108 var line = this.lineMap.getLineNumber(pos); | |
| 109 var col = this.lineMap.getColumnNumber(pos); | |
| 110 print("Exception swallow" + " @ " + this.fileName + ":" + line + ":" + col); | |
| 111 // print(node); | |
| 112 } | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 for each (var cu in task.parse()) { | |
| 117 cu.accept(visitor, null); | |
| 118 } | |
| 119 } | |
| 120 | |
| 121 // for each ".java" file in directory (recursively) and check it! | |
| 122 function main(dir) { | |
| 123 Files.walk(dir.toPath()). | |
| 124 forEach(function(p) { | |
| 125 var name = p.toFile().absolutePath; | |
| 126 if (name.endsWith(".java")) { | |
| 127 try { | |
| 128 printEmptyCatch(p.toFile().getAbsolutePath()); | |
| 129 } catch (e) { | |
| 130 print(e); | |
| 131 } | |
| 132 } | |
| 133 }); | |
| 134 } | |
| 135 | |
| 136 main(new File(arguments[0])); |
