8015701: MethodParameters are not filled in for synthetic captured local variables

Summary: Synthetic parameters for captured local variables in an anonymous inner class are not added to MethodParameters attributes
Reviewed-by: mcimadamore

src/share/classes/com/sun/tools/javac/comp/Lower.java

@@ -2711,9 +2711,14 @@ public class Lower extends TreeTranslator {
             if (fvs.nonEmpty()) {
                 List<Type> addedargtypes = List.nil();
                 for (List<VarSymbol> l = fvs; l.nonEmpty(); l = l.tail) {
-                    if (TreeInfo.isInitialConstructor(tree))
+                    if (TreeInfo.isInitialConstructor(tree)) {
+                        final Name pName = proxyName(l.head.name);
+                        m.extraParams =
+                            m.extraParams.append((VarSymbol)
+                                                 (proxies.lookup(pName).sym));
                         added = added.prepend(
-                            initField(tree.body.pos, proxyName(l.head.name)));
+                          initField(tree.body.pos, pName));
+                    }
                     addedargtypes = addedargtypes.prepend(l.head.erasure(types));
                 }
                 Type olderasure = m.erasure(types);

test/tools/javac/8015701/AnonymousParameters.java

+/*
+ * Copyright (c) 2012, 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 8015701
+ * @summary javac should generate method parameters correctly.
+ * @compile -parameters AnonymousParameters.java
+ * @run main AnonymousParameters
+ */
+import java.lang.Class;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Parameter;
+import java.util.concurrent.Callable;
+
+public class AnonymousParameters {
+
+    String[] names = {
+        "this$0",
+        "val$message"
+    };
+
+    public static void main(String... args) throws Exception {
+        new AnonymousParameters().run();
+    }
+
+    void run() throws Exception {
+        Class<?> cls = new ParameterNames().makeInner("hello").getClass();
+        Constructor<?> ctor = cls.getDeclaredConstructors()[0];
+        Parameter[] params = ctor.getParameters();
+
+        if(params.length == 2) {
+            for(int i = 0; i < 2; i++) {
+                System.err.println("Testing parameter " + params[i].getName());
+                if(!params[i].getName().equals(names[i]))
+                    error("Expected parameter name " + names[i] +
+                          " got " + params[i].getName());
+            }
+        } else
+            error("Expected 2 parameters");
+
+        if(0 != errors)
+            throw new Exception("MethodParameters test failed with " +
+                                errors + " errors");
+    }
+
+    void error(String msg) {
+        System.err.println("Error: " + msg);
+        errors++;
+    }
+
+    int errors;
+}
+
+class ParameterNames {
+
+    public Callable<String> makeInner(final String message) {
+        return new Callable<String>()  {
+            public String call() throws Exception {
+                return message;
+            }
+        };
+    }
+
+    public static void main(String... args) throws Exception {
+        ParameterNames test = new ParameterNames();
+        System.out.println(test.makeInner("Hello").call());
+    }
+}