7003744: Compiler error concerning final variables

Flow analysis does not cleanup init/uninint bit masks after for-loop

Reviewed-by: jjg

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

@@ -886,6 +886,8 @@ public class Flow extends TreeScanner {
         alive = resolveBreaks(tree, prevPendingExits) ||
             tree.cond != null && !tree.cond.type.isTrue();
         nextadr = nextadrPrev;
+        inits.excludeFrom(nextadr);
+        uninits.excludeFrom(nextadr);
     }
 
     public void visitForeachLoop(JCEnhancedForLoop tree) {

langtools/src/share/classes/com/sun/tools/javac/util/Bits.java

@@ -101,6 +101,15 @@ public class Bits {
                 (1 << (x & wordmask));
     }
 
+    /** Exclude [start...end] from this set.
+     */
+    public void excludeFrom(int start) {
+        Bits temp = new Bits();
+        temp.sizeTo(bits.length);
+        temp.inclRange(0, start);
+        andSet(temp);
+    }
+
     /** Exclude x from this set.
      */
     public void excl(int x) {

langtools/test/tools/javac/DefiniteAssignment/7003744/T7003744a.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2010, 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 7003744 6999622
+ * @summary Compiler error concerning final variables
+ * @author mcimadamore
+ *
+ * @compile T7003744a.java
+ */
+
+class T7003744a {
+    final Object x;
+
+    T7003744a() {
+        {
+            int inx = 0;
+            for(int i = 0; i < 5; i++) { }
+        }
+        for(String am: new String[1]) {
+            final String mode = am;
+        }
+
+        x = null;
+    }
+}

langtools/test/tools/javac/DefiniteAssignment/7003744/T7003744b.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2010, 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 7003744 6999622
+ * @summary Compiler error concerning final variables
+ * @author mcimadamore
+ *
+ * @compile T7003744b.java
+ */
+
+class T7003744b {
+    void test() {
+        final int bogus;
+
+        for (int i1 = 0, i2 = 2; i1 < i2; i1++) {
+         final int i_1 = 2;
+        }
+        for (Object o : new Object[] { null }) {
+         final int i_2 = 2;
+        }
+
+        bogus = 4;
+    }
+}