Wed, 07 Oct 2015 10:01:40 -0700
Merge
sundar@1531 | 1 | #// Usage: jjs exceptionswallow.js -- <directory> |
sundar@1531 | 2 | |
sundar@1531 | 3 | /* |
sundar@1531 | 4 | * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
sundar@1531 | 5 | * |
sundar@1531 | 6 | * Redistribution and use in source and binary forms, with or without |
sundar@1531 | 7 | * modification, are permitted provided that the following conditions |
sundar@1531 | 8 | * are met: |
sundar@1531 | 9 | * |
sundar@1531 | 10 | * - Redistributions of source code must retain the above copyright |
sundar@1531 | 11 | * notice, this list of conditions and the following disclaimer. |
sundar@1531 | 12 | * |
sundar@1531 | 13 | * - Redistributions in binary form must reproduce the above copyright |
sundar@1531 | 14 | * notice, this list of conditions and the following disclaimer in the |
sundar@1531 | 15 | * documentation and/or other materials provided with the distribution. |
sundar@1531 | 16 | * |
sundar@1531 | 17 | * - Neither the name of Oracle nor the names of its |
sundar@1531 | 18 | * contributors may be used to endorse or promote products derived |
sundar@1531 | 19 | * from this software without specific prior written permission. |
sundar@1531 | 20 | * |
sundar@1531 | 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
sundar@1531 | 22 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
sundar@1531 | 23 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
sundar@1531 | 24 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
sundar@1531 | 25 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
sundar@1531 | 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
sundar@1531 | 27 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
sundar@1531 | 28 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
sundar@1531 | 29 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
sundar@1531 | 30 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
sundar@1531 | 31 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
sundar@1531 | 32 | */ |
sundar@1531 | 33 | |
sundar@1531 | 34 | // This example demonstrates Java subclassing by Java.extend |
sundar@1531 | 35 | // and javac Compiler and Tree API. This example looks for |
sundar@1531 | 36 | // empty catch blocks ("exception swallow") and reports those. |
sundar@1531 | 37 | |
sundar@1531 | 38 | if (arguments.length == 0) { |
sundar@1531 | 39 | print("Usage: jjs exceptionswallow.js -- <directory>"); |
sundar@1531 | 40 | exit(1); |
sundar@1531 | 41 | } |
sundar@1531 | 42 | |
sundar@1531 | 43 | // Java types used |
sundar@1531 | 44 | var File = Java.type("java.io.File"); |
sundar@1531 | 45 | var Files = Java.type("java.nio.file.Files"); |
sundar@1531 | 46 | var StringArray = Java.type("java.lang.String[]"); |
sundar@1531 | 47 | var ToolProvider = Java.type("javax.tools.ToolProvider"); |
sundar@1531 | 48 | var Tree = Java.type("com.sun.source.tree.Tree"); |
sundar@1531 | 49 | var EmptyStatementTree = Java.type("com.sun.source.tree.EmptyStatementTree"); |
sundar@1531 | 50 | var Trees = Java.type("com.sun.source.util.Trees"); |
sundar@1531 | 51 | var TreeScanner = Java.type("com.sun.source.util.TreeScanner"); |
sundar@1531 | 52 | |
sundar@1531 | 53 | // printEmptyCatch |
sundar@1531 | 54 | |
sundar@1531 | 55 | function printEmptyCatch() { |
sundar@1531 | 56 | // get the system compiler tool |
sundar@1531 | 57 | var compiler = ToolProvider.systemJavaCompiler; |
sundar@1531 | 58 | // get standard file manager |
sundar@1531 | 59 | var fileMgr = compiler.getStandardFileManager(null, null, null); |
sundar@1531 | 60 | // Using Java.to convert script array (arguments) to a Java String[] |
sundar@1531 | 61 | var compUnits = fileMgr.getJavaFileObjects( |
sundar@1531 | 62 | Java.to(arguments, StringArray)); |
sundar@1531 | 63 | // create a new compilation task |
sundar@1531 | 64 | var task = compiler.getTask(null, fileMgr, null, null, null, compUnits); |
sundar@1531 | 65 | |
sundar@1531 | 66 | // SourcePositions object to get positions of AST nodes |
sundar@1531 | 67 | var sourcePositions = Trees.instance(task).sourcePositions; |
sundar@1531 | 68 | |
sundar@1531 | 69 | // subclass SimpleTreeVisitor - to print empty catch |
sundar@1531 | 70 | var EmptyCatchFinder = Java.extend(TreeScanner); |
sundar@1531 | 71 | |
sundar@1531 | 72 | function hasOnlyEmptyStats(stats) { |
sundar@1531 | 73 | var itr = stats.iterator(); |
sundar@1531 | 74 | while (itr.hasNext()) { |
sundar@1531 | 75 | if (! (itr.next() instanceof EmptyStatementTree)) { |
sundar@1531 | 76 | return false; |
sundar@1531 | 77 | } |
sundar@1531 | 78 | } |
sundar@1531 | 79 | |
sundar@1531 | 80 | return true; |
sundar@1531 | 81 | } |
sundar@1531 | 82 | |
sundar@1531 | 83 | var visitor = new EmptyCatchFinder() { |
sundar@1531 | 84 | // current CompilationUnitTree |
sundar@1531 | 85 | compUnit: null, |
sundar@1531 | 86 | // current LineMap (pos -> line, column) |
sundar@1531 | 87 | lineMap: null, |
sundar@1531 | 88 | // current compilation unit's file name |
sundar@1531 | 89 | fileName: null, |
sundar@1531 | 90 | |
sundar@1531 | 91 | // overrides of TreeScanner methods |
sundar@1531 | 92 | |
sundar@1531 | 93 | visitCompilationUnit: function(node, p) { |
sundar@1531 | 94 | // capture info about current Compilation unit |
sundar@1531 | 95 | this.compUnit = node; |
sundar@1531 | 96 | this.lineMap = node.lineMap; |
sundar@1531 | 97 | this.fileName = node.sourceFile.name; |
sundar@1531 | 98 | |
sundar@1531 | 99 | // Using Java.super API to call super class method here |
sundar@1531 | 100 | return Java.super(visitor).visitCompilationUnit(node, p); |
sundar@1531 | 101 | }, |
sundar@1531 | 102 | |
sundar@1531 | 103 | visitCatch: function (node, p) { |
sundar@1531 | 104 | var stats = node.block.statements; |
sundar@1531 | 105 | if (stats.empty || hasOnlyEmptyStats(stats)) { |
sundar@1531 | 106 | // print information on this empty catch |
sundar@1531 | 107 | var pos = sourcePositions.getStartPosition(this.compUnit, node); |
sundar@1531 | 108 | var line = this.lineMap.getLineNumber(pos); |
sundar@1531 | 109 | var col = this.lineMap.getColumnNumber(pos); |
sundar@1531 | 110 | print("Exception swallow" + " @ " + this.fileName + ":" + line + ":" + col); |
sundar@1531 | 111 | // print(node); |
sundar@1531 | 112 | } |
sundar@1531 | 113 | } |
sundar@1531 | 114 | } |
sundar@1531 | 115 | |
sundar@1531 | 116 | for each (var cu in task.parse()) { |
sundar@1531 | 117 | cu.accept(visitor, null); |
sundar@1531 | 118 | } |
sundar@1531 | 119 | } |
sundar@1531 | 120 | |
sundar@1531 | 121 | // for each ".java" file in directory (recursively) and check it! |
sundar@1531 | 122 | function main(dir) { |
sundar@1531 | 123 | Files.walk(dir.toPath()). |
sundar@1531 | 124 | forEach(function(p) { |
sundar@1531 | 125 | var name = p.toFile().absolutePath; |
sundar@1531 | 126 | if (name.endsWith(".java")) { |
sundar@1531 | 127 | try { |
sundar@1531 | 128 | printEmptyCatch(p.toFile().getAbsolutePath()); |
sundar@1531 | 129 | } catch (e) { |
sundar@1531 | 130 | print(e); |
sundar@1531 | 131 | } |
sundar@1531 | 132 | } |
sundar@1531 | 133 | }); |
sundar@1531 | 134 | } |
sundar@1531 | 135 | |
sundar@1531 | 136 | main(new File(arguments[0])); |