--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/compiler/jvmci/compilerToVM/GetFlagValueTest.java	Mon Feb 06 10:45:11 2017 +0100
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2015, 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 8173912
+ * @requires vm.jvmci
+ * @library / /test/lib
+ * @library ../common/patches
+ * @modules jdk.vm.ci/jdk.vm.ci.hotspot:+open
+ * @build sun.hotspot.WhiteBox
+ * @run driver ClassFileInstaller sun.hotspot.WhiteBox
+ *                                sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @build jdk.vm.ci/jdk.vm.ci.hotspot.CompilerToVMHelper
+ * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI
+ *                  -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ *                  compiler.jvmci.compilerToVM.GetFlagValueTest
+ */
+
+package compiler.jvmci.compilerToVM;
+
+import jdk.test.lib.Asserts;
+import jdk.vm.ci.hotspot.CompilerToVMHelper;
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.process.ProcessTools;
+import java.math.BigInteger;
+import java.util.Arrays;
+import java.util.regex.Pattern;
+import java.util.regex.Matcher;
+import sun.hotspot.WhiteBox;
+
+public class GetFlagValueTest {
+    public static void main(String[] args) throws Exception {
+        try {
+            CompilerToVMHelper.getFlagValue(null);
+            Asserts.fail("Expected NullPointerException when calling getFlagValue(null)");
+        } catch (NullPointerException e) {
+            // expected
+        }
+
+        Object missing = CompilerToVMHelper.getFlagValue("this is surely not a flag");
+        Asserts.assertEquals(CompilerToVMHelper.CTVM, missing);
+
+        ProcessBuilder pb;
+        OutputAnalyzer out;
+
+        String[] arguments = {"-XX:+UnlockExperimentalVMOptions", "-XX:+EnableJVMCI", "-XX:+PrintFlagsFinal", "-version"};
+        pb = ProcessTools.createJavaProcessBuilder(arguments);
+        out = new OutputAnalyzer(pb.start());
+
+        out.shouldHaveExitValue(0);
+        String[] lines = out.getStdout().split("\\r?\\n");
+        Asserts.assertTrue(lines.length > 1, "Expected output from -XX:+PrintFlagsFinal");
+
+        final WhiteBox wb = WhiteBox.getWhiteBox();
+
+        // Line example: ccstr PrintIdealGraphAddress = 127.0.0.1 {C2 notproduct} {default}
+        Pattern flagLine = Pattern.compile("(\\w+)\\s+(\\w+)\\s+:?= (?:(.+))\\{[^}]+\\}\\s+\\{[^}]+\\}");
+        for (String line : lines) {
+            if (line.indexOf('=') != -1) {
+                line = line.trim();
+                Matcher m = flagLine.matcher(line);
+                Asserts.assertTrue(m.matches(), "Unexpected line in -XX:+PrintFlagsFinal output: " + line);
+                String type = m.group(1);
+                String name = m.group(2);
+                String expect = m.group(3).trim();
+                Object value = CompilerToVMHelper.getFlagValue(name);
+                Object wbValue = wb.getVMFlag(name);
+                Asserts.assertEquals(value, wbValue, "Value of flag " + name);
+            }
+        }
+    }
+}