Mon, 17 Apr 2017 11:46:11 -0700
Added tag jdk8u141-b05 for changeset f7fc5fc0e2cb
1 #// Usage: jjs exceptionswallow.js -- <directory>
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 */
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.
38 if (arguments.length == 0) {
39 print("Usage: jjs exceptionswallow.js -- <directory>");
40 exit(1);
41 }
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");
53 // printEmptyCatch
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);
66 // SourcePositions object to get positions of AST nodes
67 var sourcePositions = Trees.instance(task).sourcePositions;
69 // subclass SimpleTreeVisitor - to print empty catch
70 var EmptyCatchFinder = Java.extend(TreeScanner);
72 function hasOnlyEmptyStats(stats) {
73 var itr = stats.iterator();
74 while (itr.hasNext()) {
75 if (! (itr.next() instanceof EmptyStatementTree)) {
76 return false;
77 }
78 }
80 return true;
81 }
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,
91 // overrides of TreeScanner methods
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;
99 // Using Java.super API to call super class method here
100 return Java.super(visitor).visitCompilationUnit(node, p);
101 },
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 }
116 for each (var cu in task.parse()) {
117 cu.accept(visitor, null);
118 }
119 }
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 }
136 main(new File(arguments[0]));