--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/compiler/c2/TestDominatingDeadCheckCast.java Tue Feb 16 12:54:20 2016 +0100
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2016, 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 8149797
+ * @summary node replaced by dominating dead cast during parsing
+ * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:TypeProfileLevel=200 -XX:CompileCommand=dontinline,TestDominatingDeadCheckCast::not_inlined TestDominatingDeadCheckCast
+ *
+ */
+
+public class TestDominatingDeadCheckCast {
+
+ static class A {
+ int f;
+ }
+
+ static class B extends A {
+ }
+
+ static A not_inlined() {
+ return new A();
+ }
+
+ static void inlined(A param) {
+ param.f = 42;
+ }
+
+ static A field;
+
+ static void test(boolean flag1, boolean flag2, boolean flag3, boolean flag4, boolean flag5) {
+ // Go through memory rather than through a local to defeat C2's replace_in_map
+ field = not_inlined();
+ // Speculation adds a CheckCast on entry of this inlined
+ // method for the parameter
+ inlined(field);
+ // Walk up the dominators is depth limited, make the CheckCast
+ // above unreachable from the last inlined call
+ if (flag1) {
+ if (flag2) {
+ if (flag3) {
+ // Speculation adds a CheckCast on entry of this
+ // inlined method for the parameter. This
+ // CheckCast is replaced by the CheckCast of the
+ // first inlined method call but the replaced
+ // CheckCast is still around during parsing.
+ inlined(field);
+ // Same as above, some useless control
+ if (flag4) {
+ if (flag5) {
+ // Speculation adds a CheckCast on entry
+ // of this inlined method for the
+ // parameter. This CheckCast is replaced
+ // by the dead CheckCast of the previous
+ // inlined() call.
+ inlined(field);
+ }
+ }
+ }
+ }
+ }
+ }
+
+ static public void main(String[] args) {
+ field = new A();
+ for (int i = 0; i < 20000; i++) {
+ test(true, true, true, true, true);
+ }
+ }
+}