8139836: Can't use super::x method reference when x is protected

Javac incorrectly diasllows reference to a protected method from a super class in method reference expressions.

Reviewed-by: mcimadamore

langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/ArgumentAttr.java

@@ -263,6 +263,8 @@ public class ArgumentAttr extends JCTree.Visitor {
                 attr.memberReferenceQualifierResult(tree));
         JCMemberReference mref2 = new TreeCopier<Void>(attr.make).copy(tree);
         mref2.expr = exprTree;
+        Symbol lhsSym = TreeInfo.symbol(exprTree);
+        localEnv.info.selectSuper = lhsSym != null && lhsSym.name == lhsSym.name.table.names._super;
         Symbol res =
                 attr.rs.getMemberReference(tree, localEnv, mref2,
                         exprTree.type, tree.name);

langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java

@@ -2817,8 +2817,10 @@ public class Attr extends JCTree.Visitor {
                 //omitted as we don't know at this stage as to whether this is a
                 //raw selector (because of inference)
                 chk.validate(that.expr, env, false);
+            } else {
+                Symbol lhsSym = TreeInfo.symbol(that.expr);
+                localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
             }
-
             //attrib type-arguments
             List<Type> typeargtypes = List.nil();
             if (that.typeargs != null) {

langtools/test/tools/javac/lambda/MethodReference74.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2015, 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 8139836
+ * @summary Can't use super::x method reference when x is protected
+ * @run main MethodReference74
+ */
+
+public class MethodReference74 extends pkg.Parent {
+
+    public void protectedMethod() {
+        log = "In child, calling ... ";
+        Runnable r = super::protectedMethod;
+        r.run();
+        run(super::protectedMethod); // test also in invocation context.
+    }
+
+    private void run(Runnable r) {
+        r.run();
+    }
+
+    public static void main(String[] args) {
+        MethodReference74 child = new MethodReference74();
+        child.protectedMethod();
+        if (!child.log.equals("In child, calling ...  parent's  parent's ")) {
+            throw new AssertionError("Unexpected output" + child.log);
+        }
+    }
+}

langtools/test/tools/javac/lambda/pkg/Parent.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2015, 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.
+ */
+
+package pkg;
+
+public class Parent {
+
+    public String log;
+
+    protected void protectedMethod() {
+        log += " parent's ";
+    }
+}