--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/patterns/LocalVariableTable.java Wed Nov 27 09:00:01 2019 +0100
@@ -0,0 +1,165 @@
+/*
+ * Copyright (c) 2013, 2019, 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 8231827
+ * @summary Ensure the LV table entries are generated for bindings
+ * @modules jdk.jdeps/com.sun.tools.classfile
+ * @compile -g --enable-preview -source ${jdk.version} LocalVariableTable.java
+ * @run main/othervm --enable-preview LocalVariableTable
+ */
+
+import java.io.*;
+import java.lang.annotation.*;
+import java.util.*;
+import com.sun.tools.classfile.*;
+
+/*
+ * The test checks that a LocalVariableTable attribute is generated for the
+ * method bodies containing patterns, and checks that the expected
+ * set of entries is found in the attribute.
+ *
+ * The test looks for test cases represented by nested classes whose
+ * name begins with "Pattern". Each such class contains a method
+ * with patterns, and because the test is compiled
+ * with -g, these methods should have a LocalVariableTable. The set of
+ * expected names in the LVT is provided in an annotation on the class for
+ * the test case.
+ */
+//Copied from: test/langtools/tools/javac/lambda/LocalVariableTable.java
+public class LocalVariableTable {
+ public static void main(String... args) throws Exception {
+ new LocalVariableTable().run();
+ }
+
+ void run() throws Exception {
+ // the declared classes are returned in an unspecified order,
+ // so for neatness, sort them by name before processing them
+ Class<?>[] classes = getClass().getDeclaredClasses();
+ Arrays.sort(classes, (c1, c2) -> c1.getName().compareTo(c2.getName()));
+
+ for (Class<?> c : classes) {
+ if (c.getSimpleName().startsWith("Pattern"))
+ check(c);
+ }
+ if (errors > 0)
+ throw new Exception(errors + " errors found");
+ }
+
+ /** Check an individual test case. */
+ void check(Class<?> c) throws Exception {
+ System.err.println("Checking " + c.getSimpleName());
+
+ Expect expect = c.getAnnotation(Expect.class);
+ if (expect == null) {
+ error("@Expect not found for class " + c.getSimpleName());
+ return;
+ }
+
+ ClassFile cf = ClassFile.read(getClass().getResource(c.getName() + ".class").openStream());
+ Method m = getMethodByName(cf, c.getSimpleName().contains("Lambda") ? "lambda$" : "test");
+ if (m == null) {
+ error("test method not found");
+ return;
+ }
+
+ Code_attribute code = (Code_attribute) m.attributes.get(Attribute.Code);
+ if (code == null) {
+ error("Code attribute not found");
+ return;
+ }
+
+ LocalVariableTable_attribute lvt =
+ (LocalVariableTable_attribute) code.attributes.get(Attribute.LocalVariableTable);
+ if (lvt == null) {
+ error("LocalVariableTable attribute not found");
+ return;
+ }
+
+ Set<String> foundNames = new LinkedHashSet<>();
+ for (LocalVariableTable_attribute.Entry e: lvt.local_variable_table) {
+ foundNames.add(cf.constant_pool.getUTF8Value(e.name_index));
+ }
+
+ Set<String> expectNames = new LinkedHashSet<>(Arrays.asList(expect.value()));
+ if (!foundNames.equals(expectNames)) {
+ Set<String> foundOnly = new LinkedHashSet<>(foundNames);
+ foundOnly.removeAll(expectNames);
+ for (String s: foundOnly)
+ error("Unexpected name found: " + s);
+ Set<String> expectOnly = new LinkedHashSet<>(expectNames);
+ expectOnly.removeAll(foundNames);
+ for (String s: expectOnly)
+ error("Expected name not found: " + s);
+ }
+ }
+
+ Method getMethodByName(ClassFile cf, String name) throws ConstantPoolException {
+ for (Method m: cf.methods) {
+ if (m.getName(cf.constant_pool).startsWith(name))
+ return m;
+ }
+ return null;
+ }
+
+ /** Report an error. */
+ void error(String msg) {
+ System.err.println("Error: " + msg);
+ errors++;
+ }
+
+ int errors;
+
+ /**
+ * Annotation used to provide the set of names expected in the LVT attribute.
+ */
+ @Retention(RetentionPolicy.RUNTIME)
+ @interface Expect {
+ String[] value();
+ }
+
+ /*
+ * ---------- Test cases ---------------------------------------------------
+ */
+
+ @Expect({ "o", "s" })
+ static class Pattern_Simple {
+ public static void test(Object o) {
+ if (o instanceof String s) {}
+ }
+ }
+
+ @Expect({ "s" })
+ static class Pattern_Lambda {
+ public static void test(Object o) {
+ if (o instanceof String s) {
+ Runnable r = () -> {
+ s.length();
+ };
+ }
+ }
+ }
+
+}
+