--- /dev/null	2020-01-02 04:43:18.583999853 +0000
+++ new/test/lib/sun/hotspot/code/Compiler.java	2020-01-30 06:40:39.009413286 +0000
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2018, 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 sun.hotspot.code;
+
+import sun.hotspot.WhiteBox;
+
+/**
+ * API to obtain information about enabled JIT compilers
+ * retrieved from the VM with the WhiteBox API.
+ */
+public class Compiler {
+
+    private static final WhiteBox WB = WhiteBox.getWhiteBox();
+
+    /**
+     * Check if Graal is used as JIT compiler.
+     *
+     * Graal is enabled if following conditions are true:
+     * - we are not in Interpreter mode
+     * - UseJVMCICompiler flag is true
+     * - jvmci.Compiler variable is equal to 'graal'
+     * - TieredCompilation is not used or TieredStopAtLevel is greater than 3
+     * No need to check client mode because it set UseJVMCICompiler to false.
+     *
+     * @return true if Graal is used as JIT compiler.
+     */
+    public static boolean isGraalEnabled() {
+        Boolean useCompiler = WB.getBooleanVMFlag("UseCompiler");
+        if (useCompiler == null || !useCompiler) {
+            return false;
+        }
+        Boolean useJvmciComp = WB.getBooleanVMFlag("UseJVMCICompiler");
+        if (useJvmciComp == null || !useJvmciComp) {
+            return false;
+        }
+        // This check might be redundant but let's keep it for now.
+        String jvmciCompiler = System.getProperty("jvmci.Compiler");
+        if (jvmciCompiler == null || !jvmciCompiler.equals("graal")) {
+            return false;
+        }
+
+        Boolean tieredCompilation = WB.getBooleanVMFlag("TieredCompilation");
+        Long compLevel = WB.getIntxVMFlag("TieredStopAtLevel");
+        // if TieredCompilation is enabled and compilation level is <= 3 then no Graal is used
+        if (tieredCompilation != null && tieredCompilation &&
+            compLevel != null && compLevel <= 3) {
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * Check if C2 is used as JIT compiler.
+     *
+     * C2 is enabled if following conditions are true:
+     * - we are not in Interpreter mode
+     * - we are in Server compilation mode
+     * - TieredCompilation is not used or TieredStopAtLevel is greater than 3
+     * - Graal is not used
+     *
+     * @return true if C2 is used as JIT compiler.
+     */
+    public static boolean isC2Enabled() {
+        Boolean useCompiler = WB.getBooleanVMFlag("UseCompiler");
+        if (useCompiler == null || !useCompiler) {
+            return false;
+        }
+        Boolean serverMode = WB.getBooleanVMFlag("ProfileInterpreter");
+        if (serverMode == null || !serverMode) {
+            return false;
+        }
+
+        Boolean tieredCompilation = WB.getBooleanVMFlag("TieredCompilation");
+        Long compLevel = WB.getIntxVMFlag("TieredStopAtLevel");
+        // if TieredCompilation is enabled and compilation level is <= 3 then no Graal is used
+        if (tieredCompilation != null && tieredCompilation &&
+            compLevel != null && compLevel <= 3) {
+            return false;
+        }
+
+        if (isGraalEnabled()) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /*
+     * Check if C1 is used as JIT compiler.
+     *
+     * C1 is enabled if following conditions are true:
+     * - we are not in Interpreter mode
+     * - we are not in Server compilation mode
+     * - TieredCompilation is used in Server mode
+     *
+     * @return true if C1 is used as JIT compiler.
+     */
+    public static boolean isC1Enabled() {
+        Boolean useCompiler = WB.getBooleanVMFlag("UseCompiler");
+        if (useCompiler == null || !useCompiler) {
+            return false;
+        }
+        Boolean serverMode = WB.getBooleanVMFlag("ProfileInterpreter");
+        if (serverMode == null || !serverMode) {
+            return true; // Client mode
+        }
+
+        Boolean tieredCompilation = WB.getBooleanVMFlag("TieredCompilation");
+        // C1 is not used in server mode if TieredCompilation is off.
+        if (tieredCompilation != null && !tieredCompilation) {
+            return false;
+        }
+        return true;
+    }
+}