8025141: java.lang.ClassFormatError: Illegal field modifiers in class (...)

Should not generate non-public $assertionsDisabled field into interfaces

Reviewed-by: jjg, vromero

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

@@ -2172,6 +2172,18 @@ public class Lower extends TreeTranslator {
  * Code for enabling/disabling assertions.
  *************************************************************************/
 
+    private ClassSymbol assertionsDisabledClassCache;
+
+    /**Used to create an auxiliary class to hold $assertionsDisabled for interfaces.
+     */
+    private ClassSymbol assertionsDisabledClass() {
+        if (assertionsDisabledClassCache != null) return assertionsDisabledClassCache;
+
+        assertionsDisabledClassCache = makeEmptyClass(STATIC | SYNTHETIC, outermostClassDef.sym).sym;
+
+        return assertionsDisabledClassCache;
+    }
+
     // This code is not particularly robust if the user has
     // previously declared a member named '$assertionsDisabled'.
     // The same faulty idiom also appears in the translation of
@@ -2182,8 +2194,9 @@ public class Lower extends TreeTranslator {
         // Outermost class may be either true class or an interface.
         ClassSymbol outermostClass = outermostClassDef.sym;
 
-        // note that this is a class, as an interface can't contain a statement.
-        ClassSymbol container = currentClass;
+        //only classes can hold a non-public field, look for a usable one:
+        ClassSymbol container = !currentClass.isInterface() ? currentClass :
+                assertionsDisabledClass();
 
         VarSymbol assertDisabledSym =
             (VarSymbol)lookupSynthetic(dollarAssertionsDisabled,
@@ -2208,6 +2221,16 @@ public class Lower extends TreeTranslator {
             JCVariableDecl assertDisabledDef = make.VarDef(assertDisabledSym,
                                                    notStatus);
             containerDef.defs = containerDef.defs.prepend(assertDisabledDef);
+
+            if (currentClass.isInterface()) {
+                //need to load the assertions enabled/disabled state while
+                //initializing the interface:
+                JCClassDecl currentClassDef = classDef(currentClass);
+                make_at(currentClassDef.pos());
+                JCStatement dummy = make.If(make.QualIdent(assertDisabledSym), make.Skip(), null);
+                JCBlock clinit = make.Block(STATIC, List.<JCStatement>of(dummy));
+                currentClassDef.defs = currentClassDef.defs.prepend(clinit);
+            }
         }
         make_at(pos);
         return makeUnary(NOT, make.Ident(assertDisabledSym));
@@ -3929,6 +3952,7 @@ public class Lower extends TreeTranslator {
             accessConstrTags = null;
             accessed = null;
             enumSwitchMap.clear();
+            assertionsDisabledClassCache = null;
         }
         return translated.toList();
     }

langtools/test/tools/javac/defaultMethods/Assertions.java

@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 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.
+ */
+package test;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+/*
+ * @test
+ * @bug 8025141
+ * @summary Interfaces must not contain non-public fields, ensure $assertionsDisabled
+ *          is not generated into an interface
+ * @compile Assertions.java
+ * @run main/othervm -da test.Assertions
+ * @run main/othervm -ea:test.Assertions test.Assertions Inner
+ * @run main/othervm -ea:test.Outer test.Assertions Outer
+ * @run main/othervm -ea:test.Another test.Assertions Another.Inner
+ * @run main/othervm -ea:test... test.Assertions Inner Outer Another.Inner
+ */
+
+public class Assertions {
+    interface Inner {
+        default void testInner() {
+            assert false;
+        }
+    }
+
+    static class InnerImpl implements Inner {}
+
+    static class OuterImpl implements Outer {}
+
+    static class AnotherInnerImpl implements Another.Inner {}
+
+    public static void main(String... args) {
+        Set<String> shouldThrowAssert = new HashSet<String>(Arrays.asList(args));
+        try {
+            new InnerImpl().testInner();
+            if (shouldThrowAssert.contains("Inner")) {
+                throw new IllegalStateException("AssertionError expected, but not thrown.");
+            }
+        } catch (AssertionError e) {
+            if (!shouldThrowAssert.contains("Inner")) {
+                throw new IllegalStateException("AssertionError not expected, but thrown.");
+            }
+        }
+        try {
+            new OuterImpl().testOuter();
+            if (shouldThrowAssert.contains("Outer")) {
+                throw new IllegalStateException("AssertionError expected, but not thrown.");
+            }
+        } catch (AssertionError e) {
+            if (!shouldThrowAssert.contains("Outer")) {
+                throw new IllegalStateException("AssertionError not expected, but thrown.");
+            }
+        }
+        try {
+            new AnotherInnerImpl().testAnotherInner();
+            if (shouldThrowAssert.contains("Another.Inner")) {
+                throw new IllegalStateException("AssertionError expected, but not thrown.");
+            }
+        } catch (AssertionError e) {
+            if (!shouldThrowAssert.contains("Another.Inner")) {
+                throw new IllegalStateException("AssertionError not expected, but thrown.");
+            }
+        }
+    }
+}
+
+interface Outer {
+    default void testOuter() {
+        assert false;
+    }
+}
+
+@interface Another {
+    interface Inner {
+        default void testAnotherInner() {
+            assert false;
+        }
+    }
+}

langtools/test/tools/javac/defaultMethods/CannotChangeAssertionsStateAfterInitialized.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 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 8025141
+ * @summary Ensure the assertion status cannot be changed once the class is initialized
+ * @compile CannotChangeAssertionsStateAfterInitialized.java
+ * @run main/othervm -da CannotChangeAssertionsStateAfterInitialized
+ */
+
+public interface CannotChangeAssertionsStateAfterInitialized {
+    default void m() {
+        assert false;
+    }
+
+    public static void main(String[] args) {
+        ClassLoader cl = CannotChangeAssertionsStateAfterInitialized.class.getClassLoader();
+        cl.setClassAssertionStatus(CannotChangeAssertionsStateAfterInitialized.class.getName(), true);
+        new CannotChangeAssertionsStateAfterInitialized() {}.m();
+    }
+
+}