137 lines
5.2 KiB
JavaScript
137 lines
5.2 KiB
JavaScript
#// Usage: jjs exceptionswallow.js -- <directory>
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/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of Oracle nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// This example demonstrates Java subclassing by Java.extend
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// and javac Compiler and Tree API. This example looks for
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// empty catch blocks ("exception swallow") and reports those.
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if (arguments.length == 0) {
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print("Usage: jjs exceptionswallow.js -- <directory>");
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exit(1);
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}
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// Java types used
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var File = Java.type("java.io.File");
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var Files = Java.type("java.nio.file.Files");
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var StringArray = Java.type("java.lang.String[]");
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var ToolProvider = Java.type("javax.tools.ToolProvider");
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var Tree = Java.type("com.sun.source.tree.Tree");
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var EmptyStatementTree = Java.type("com.sun.source.tree.EmptyStatementTree");
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var Trees = Java.type("com.sun.source.util.Trees");
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var TreeScanner = Java.type("com.sun.source.util.TreeScanner");
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// printEmptyCatch
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function printEmptyCatch() {
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// get the system compiler tool
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var compiler = ToolProvider.systemJavaCompiler;
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// get standard file manager
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var fileMgr = compiler.getStandardFileManager(null, null, null);
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// Using Java.to convert script array (arguments) to a Java String[]
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var compUnits = fileMgr.getJavaFileObjects(
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Java.to(arguments, StringArray));
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// create a new compilation task
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var task = compiler.getTask(null, fileMgr, null, null, null, compUnits);
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// SourcePositions object to get positions of AST nodes
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var sourcePositions = Trees.instance(task).sourcePositions;
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// subclass SimpleTreeVisitor - to print empty catch
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var EmptyCatchFinder = Java.extend(TreeScanner);
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function hasOnlyEmptyStats(stats) {
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var itr = stats.iterator();
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while (itr.hasNext()) {
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if (! (itr.next() instanceof EmptyStatementTree)) {
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return false;
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}
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}
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return true;
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}
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var visitor = new EmptyCatchFinder() {
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// current CompilationUnitTree
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compUnit: null,
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// current LineMap (pos -> line, column)
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lineMap: null,
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// current compilation unit's file name
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fileName: null,
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// overrides of TreeScanner methods
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visitCompilationUnit: function(node, p) {
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// capture info about current Compilation unit
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this.compUnit = node;
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this.lineMap = node.lineMap;
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this.fileName = node.sourceFile.name;
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// Using Java.super API to call super class method here
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return Java.super(visitor).visitCompilationUnit(node, p);
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},
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visitCatch: function (node, p) {
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var stats = node.block.statements;
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if (stats.empty || hasOnlyEmptyStats(stats)) {
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// print information on this empty catch
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var pos = sourcePositions.getStartPosition(this.compUnit, node);
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var line = this.lineMap.getLineNumber(pos);
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var col = this.lineMap.getColumnNumber(pos);
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print("Exception swallow" + " @ " + this.fileName + ":" + line + ":" + col);
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// print(node);
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}
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}
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}
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for each (var cu in task.parse()) {
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cu.accept(visitor, null);
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}
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}
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// for each ".java" file in directory (recursively) and check it!
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function main(dir) {
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Files.walk(dir.toPath()).
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forEach(function(p) {
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var name = p.toFile().absolutePath;
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if (name.endsWith(".java")) {
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try {
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printEmptyCatch(p.toFile().getAbsolutePath());
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} catch (e) {
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print(e);
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}
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}
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});
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}
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main(new File(arguments[0]));
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