8139069: JVM should throw ClassFormatError for <init> methods in interfaces

If method being parsed is in an interface, throw ClassFormatError if its name is "<init>"

Reviewed-by: acorn, lfoltan

hotspot/src/share/vm/classfile/classFileParser.cpp

@@ -1997,6 +1997,10 @@ methodHandle ClassFileParser::parse_method(bool is_interface,
     verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
   }
 
+  if (name == vmSymbols::object_initializer_name() && is_interface) {
+    classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_(nullHandle));
+  }
+
   int args_size = -1;  // only used when _need_verify is true
   if (_need_verify) {
     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +

hotspot/src/share/vm/classfile/verifier.cpp

@@ -1579,11 +1579,9 @@ void ClassVerifier::verify_method(methodHandle m, TRAPS) {
             return;
           }
           // Make sure "this" has been initialized if current method is an
-          // <init>.  Note that "<init>" methods in interfaces are just
+          // <init>.
-          // normal methods.  Interfaces cannot have ctors.
           if (_method->name() == vmSymbols::object_initializer_name() &&
-              current_frame.flag_this_uninit() &&
+              current_frame.flag_this_uninit()) {
-              !current_class()->is_interface()) {
             verify_error(ErrorContext::bad_code(bci),
                          "Constructor must call super() or this() "
                          "before return");

hotspot/test/runtime/classFileParserBug/InitInInterface.java

@@ -0,0 +1,57 @@
+/*
+ * 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 8139069
+ * @summary Check that any method named <init> in an interface causes ClassFormatError
+ * @compile nonvoidinit.jasm voidinit.jasm
+ * @run main InitInInterface
+ */
+
+// Test that an <init> method is not allowed in interfaces.
+public class InitInInterface {
+    public static void main(String args[]) throws Throwable {
+
+        System.out.println("Regression test for bug 8130183");
+        try {
+            Class newClass = Class.forName("nonvoidinit");
+            throw new RuntimeException(
+                 "ClassFormatError not thrown for non-void <init> in an interface");
+        } catch (java.lang.ClassFormatError e) {
+            if (!e.getMessage().contains("Interface cannot have a method named <init>")) {
+                throw new RuntimeException("Unexpected exception nonvoidint: " + e.getMessage());
+            }
+        }
+        try {
+            Class newClass = Class.forName("voidinit");
+            throw new RuntimeException(
+                 "ClassFormatError not thrown for void <init> in an interface");
+        } catch (java.lang.ClassFormatError e) {
+            if (!e.getMessage().contains("Interface cannot have a method named <init>")) {
+                throw new RuntimeException("Unexpected exception voidint: " + e.getMessage());
+            }
+        }
+    }
+}

hotspot/test/runtime/classFileParserBug/nonvoidinit.jasm

@@ -0,0 +1,31 @@
+/*
+ * 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.
+ *
+ */
+
+// Interface containing  non-void <init> method.
+public interface nonvoidinit version 50:0
+{
+
+    public abstract Method "<init>":"()I";
+
+} // end Class nonvoidinit

hotspot/test/runtime/classFileParserBug/voidinit.jasm

@@ -0,0 +1,31 @@
+/*
+ * 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.
+ *
+ */
+
+// Interface containing void <init> method.
+public interface voidinit version 50:0
+{
+
+    public abstract Method "<init>":"()V";
+
+} // end Class voidinit