6181889: Empty try/finally results in bytecodes being generated
Reviewed-by: mcimadamore
--- a/langtools/src/share/classes/com/sun/tools/javac/comp/Lower.java Thu Mar 07 08:26:13 2013 -0800
+++ b/langtools/src/share/classes/com/sun/tools/javac/comp/Lower.java Mon Mar 11 15:35:13 2013 +0000
@@ -3807,8 +3807,16 @@
@Override
public void visitTry(JCTry tree) {
+ /* special case of try without catchers and with finally emtpy.
+ * Don't give it a try, translate only the body.
+ */
if (tree.resources.isEmpty()) {
- super.visitTry(tree);
+ if (tree.catchers.isEmpty() &&
+ tree.finalizer.getStatements().isEmpty()) {
+ result = translate(tree.body);
+ } else {
+ super.visitTry(tree);
+ }
} else {
result = makeTwrTry(tree);
}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/T6181889/EmptyFinallyTest.java Mon Mar 11 15:35:13 2013 +0000
@@ -0,0 +1,67 @@
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.nio.file.Paths;
+
+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 6181889
+ * @summary Empty try/finally results in bytecodes being generated
+ */
+
+public class EmptyFinallyTest {
+ private static final String assertionErrorMsg =
+ "No \"Exception table\" should be generated in this case";
+
+ public static void main(String[] args) {
+ new EmptyFinallyTest().run();
+ }
+
+ void run() {
+ check("-c", Paths.get(System.getProperty("test.classes"),
+ "EmptyFinally.class").toString());
+ }
+
+ void check(String... params) {
+ StringWriter s;
+ String out;
+ try (PrintWriter pw = new PrintWriter(s = new StringWriter())) {
+ com.sun.tools.javap.Main.run(params, pw);
+ out = s.toString();
+ }
+ if (out.contains("Exception table")) {
+ throw new AssertionError(assertionErrorMsg);
+ }
+ }
+}
+
+class EmptyFinally {
+ void m() {
+ try {
+ System.out.println("EMPTY TRY!");
+ } finally {}
+ }
+}