--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/switchexpr/BreakTest.java Wed Aug 29 09:36:17 2018 +0200
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2018, 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 8206986
+ * @summary Ensure BreakTree.getLabel returns reasonable values
+ * @modules jdk.compiler
+ */
+
+import java.io.StringWriter;
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import javax.lang.model.element.Name;
+import javax.tools.*;
+
+import com.sun.source.tree.BreakTree;
+import com.sun.source.util.JavacTask;
+import com.sun.source.util.TreePathScanner;
+
+public class BreakTest {
+
+ private static final String CODE =
+ "public class C {" +
+ " void t1(Integer i) {" +
+ " LABEL: switch (i) {" +
+ " case null: i++; break LABEL;" +
+ " default: i++; break;" +
+ " }" +
+ " }" +
+ " int t2(Integer i) {" +
+ " return switch (i) {" +
+ " case null: break LABEL;" +
+ " default: break 2;" +
+ " }" +
+ " }" +
+ "}";
+
+ public static void main(String[] args) throws Exception {
+ final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
+ assert tool != null;
+ DiagnosticListener<JavaFileObject> noErrors = d -> {};
+
+ StringWriter out = new StringWriter();
+ JavacTask ct = (JavacTask) tool.getTask(out, null, noErrors,
+ List.of("-XDdev", "--enable-preview", "-source", "12"), null,
+ Arrays.asList(new MyFileObject(CODE)));
+ List<String> labels = new ArrayList<>();
+ new TreePathScanner<Void, Void>() {
+ @Override
+ public Void visitBreak(BreakTree node, Void p) {
+ Name label = node.getLabel();
+ labels.add(label != null ? label.toString() : null);
+ return super.visitBreak(node, p);
+ }
+ }.scan(ct.parse(), null);
+
+ List<String> expected = Arrays.asList("LABEL", null, "LABEL", null);
+
+ if (!expected.equals(labels)) {
+ throw new AssertionError("Unexpected labels found: " + labels);
+ }
+ }
+
+ static class MyFileObject extends SimpleJavaFileObject {
+ private String text;
+
+ public MyFileObject(String text) {
+ super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
+ this.text = text;
+ }
+
+ @Override
+ public CharSequence getCharContent(boolean ignoreEncodingErrors) {
+ return text;
+ }
+ }
+}