6904403: assert(f == k->has_finalizer(),"inconsistent has_finalizer") with debug VM

Summary: Don't assert if one of classes in hierarhy was redefined
Reviewed-by: coleenp, sspitsyn

src/share/vm/classfile/classFileParser.cpp

@@ -4421,9 +4421,15 @@ void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
   Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
                                  vmSymbols::void_method_signature());
   if (m != NULL && !m->is_empty_method()) {
-    f = true;
+      f = true;
+  }
+
+  // Spec doesn't prevent agent from redefinition of empty finalizer.
+  // Despite the fact that it's generally bad idea and redefined finalizer
+  // will not work as expected we shouldn't abort vm in this case
+  if (!k->has_redefined_this_or_super()) {
+    assert(f == k->has_finalizer(), "inconsistent has_finalizer");
   }
-  assert(f == k->has_finalizer(), "inconsistent has_finalizer");
 #endif
 
   // Check if this klass supports the java.lang.Cloneable interface

src/share/vm/oops/instanceKlass.cpp

@@ -1572,6 +1572,21 @@ Method* InstanceKlass::uncached_lookup_method(Symbol* name, Symbol* signature, M
   return NULL;
 }
 
+#ifdef ASSERT
+// search through class hierarchy and return true if this class or
+// one of the superclasses was redefined
+bool InstanceKlass::has_redefined_this_or_super() const {
+  const InstanceKlass* klass = this;
+  while (klass != NULL) {
+    if (klass->has_been_redefined()) {
+      return true;
+    }
+    klass = InstanceKlass::cast(klass->super());
+  }
+  return false;
+}
+#endif
+
 // lookup a method in the default methods list then in all transitive interfaces
 // Do NOT return private or static methods
 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,

src/share/vm/oops/instanceKlass.hpp

@@ -808,6 +808,11 @@ class InstanceKlass: public Klass {
   bool implements_interface(Klass* k) const;
   bool is_same_or_direct_interface(Klass* k) const;
 
+#ifdef ASSERT
+  // check whether this class or one of its superclasses was redefined
+  bool has_redefined_this_or_super() const;
+#endif
+
   // Access to the implementor of an interface.
   Klass* implementor() const
   {
@@ -865,8 +870,8 @@ class InstanceKlass: public Klass {
 
   // Casting from Klass*
   static InstanceKlass* cast(Klass* k) {
-    assert(k->is_klass(), "must be");
-    assert(k->oop_is_instance(), "cast to InstanceKlass");
+    assert(k == NULL || k->is_klass(), "must be");
+    assert(k == NULL || k->oop_is_instance(), "cast to InstanceKlass");
     return (InstanceKlass*) k;
   }
 

test/runtime/RedefineFinalizer/Agent.java

+/*
+ * Copyright (c) 2014, 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.
+ */
+
+import java.lang.instrument.Instrumentation;
+import java.lang.instrument.ClassDefinition;
+
+import jdk.internal.org.objectweb.asm.ClassWriter;
+import jdk.internal.org.objectweb.asm.Label;
+import jdk.internal.org.objectweb.asm.MethodVisitor;
+import jdk.internal.org.objectweb.asm.Opcodes;
+
+public class Agent implements Opcodes {
+
+    private static byte[] makeNewMartyr() {
+        ClassWriter cw = new ClassWriter(0);
+        MethodVisitor mv;
+
+        cw.visit(V1_8, ACC_PUBLIC + ACC_SUPER, "Martyr", null, "java/lang/Object", null);
+        cw.visitSource(null, null);
+
+        {
+            mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
+            mv.visitCode();
+            Label lab0 = new Label();
+            mv.visitLabel(lab0);
+            mv.visitLineNumber(1, lab0);
+            mv.visitVarInsn(ALOAD, 0);
+            mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
+            mv.visitInsn(RETURN);
+            mv.visitMaxs(1, 1);
+            mv.visitEnd();
+        }
+
+        {
+            mv = cw.visitMethod(ACC_PUBLIC, "getName", "()Ljava/lang/String;", null, null);
+            mv.visitCode();
+            Label lab0 = new Label();
+            mv.visitLabel(lab0);
+            mv.visitLineNumber(6, lab0);
+            mv.visitLdcInsn("Redefinition done");
+            mv.visitInsn(ARETURN);
+            mv.visitMaxs(1, 1);
+            mv.visitEnd();
+        }
+
+        {
+            mv = cw.visitMethod(ACC_PROTECTED, "finalize", "()V", null, null);
+            mv.visitCode();
+            Label lab0 = new Label();
+            mv.visitLabel(lab0);
+            mv.visitLineNumber(8, lab0);
+            mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
+            mv.visitLdcInsn("Finalizer called");
+            mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V");
+            mv.visitInsn(RETURN);
+            mv.visitMaxs(2, 1);
+            mv.visitEnd();
+        }
+
+        cw.visitEnd();
+        return cw.toByteArray();
+    }
+
+
+    public static void premain(String args, Instrumentation inst) throws Exception {
+        agentmain(args, inst);
+    }
+
+    public static void agentmain(String args, Instrumentation inst) throws Exception {
+        ClassDefinition martyrDef =
+              new ClassDefinition(Class.forName("Martyr"), makeNewMartyr());
+        inst.redefineClasses(martyrDef);
+    }
+}

test/runtime/RedefineFinalizer/Main.java

+/*
+ * Copyright (c) 2014, 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.
+ */
+
+public class Main {
+    public static void main(String[] args) {
+      try {
+          MartyrSon m = new MartyrSon();
+          System.out.println(m.getName());
+          System.runFinalization();
+      } catch (Throwable e) {
+          e.printStackTrace();
+      }
+    }
+}

test/runtime/RedefineFinalizer/Martyr.java

+/*
+ * Copyright (c) 2014, 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.
+ */
+
+public class Martyr {
+    public String getName() {
+        return "Redefinition NOT done";
+    }
+
+    protected void finalize() {
+      // should be empty
+    }
+
+}

test/runtime/RedefineFinalizer/MartyrSon.java

+/*
+ * Copyright (c) 2014, 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.
+ */
+
+class MartyrSon extends Martyr {
+    public String getName() {
+      return super.getName();
+    }
+}

test/runtime/RedefineFinalizer/manifest.mf

+Main-Class: Main
+Agent-Class: Agent
+Can-Redefine-Classes: true
+Can-Retransform-Classes: true
+Premain-Class: Agent

test/runtime/RedefineFinalizer/testme.sh

+#!/bin/sh
+
+# Copyright (c) 2014 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 6904403
+# @summary Don't assert if we redefine finalize method
+# @run shell testme.sh
+
+# This test shouldn't provoke and assert(f == k->has_finalizer()) failed: inconsistent has_finalizer
+
+. ${TESTSRC}/../../test_env.sh
+
+JAVAC=${COMPILEJAVA}${FS}bin${FS}javac
+JAR=${COMPILEJAVA}${FS}bin${FS}jar
+JAVA=${TESTJAVA}${FS}bin${FS}java
+
+TOOLS_JAR=${TESTJAVA}${FS}lib${FS}tools.jar
+
+cp ${TESTSRC}${FS}*.java .
+${JAVAC} -XDignore.symbol.file -classpath ${TOOLS_JAR} -sourcepath ${TESTSRC} *.java
+if [ $? -eq 1 ]
+  then
+    echo "Compilation failed"
+    exit
+fi
+
+${JAR} cvfm testcase.jar ${TESTSRC}/manifest.mf .
+${JAVA} -Xbootclasspath/a:${TOOLS_JAR} -javaagent:${PWD}/testcase.jar Main