8050386: javac, follow-up of fix for JDK-8049305

Reviewed-by: mcimadamore

src/share/classes/com/sun/tools/javac/jvm/Gen.java

@@ -1194,7 +1194,7 @@ public class Gen extends JCTree.Visitor {
                              boolean testFirst) {
             Env<GenContext> loopEnv = env.dup(loop, new GenContext());
             int startpc = code.entryPoint();
-            if (testFirst) {
+            if (testFirst) { //while or for loop
                 CondItem c;
                 if (cond != null) {
                     code.statBegin(cond.pos);
@@ -1240,6 +1240,9 @@ public class Gen extends JCTree.Visitor {
                 code.resolve(c.falseJumps);
             }
             code.resolve(loopEnv.info.exit);
+            if (loopEnv.info.exit != null) {
+                loopEnv.info.exit.state.defined.excludeFrom(code.nextreg);
+            }
         }
 
         private enum LoopLocalVarRangeEndingPoint {

test/tools/javac/T8049305/WrongStackframeGenerationTest1.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.
+ */
+
+/*
+ * @test
+ * @bug 8049305
+ * @summary Verification error due to a bad stackmap frame generated by javac
+ */
+
+public class WrongStackframeGenerationTest1 {
+    public static void main(String[] args) {}
+
+    static void foo(){
+        while (true) {
+            int i = 0;
+            break;
+        }
+        switch (1) {
+            case 1:
+                int j = 0;
+            case 2:
+                bar();
+        }
+    }
+
+    static void bar() {}
+}

test/tools/javac/T8049305/WrongStackframeGenerationTest2.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.
+ */
+
+/*
+ * @test
+ * @bug 8049305
+ * @summary Verification error due to a bad stackmap frame generated by javac
+ */
+
+public class WrongStackframeGenerationTest2 {
+    public static void main(String[] args) {}
+
+    static void foo() {
+        int len;
+        for (;;) {
+            try {
+                len = 1;
+                break;
+            } catch (Exception e) {
+            }
+        }
+
+        try {
+           if (len == -1) {
+               len = 0;
+           }
+        } finally {
+        }
+    }
+}