8068183: Add isTieredSupported method to c.o.j.t.Platforms

Reviewed-by: kvn, iignatyev

hotspot/test/testlibrary/com/oracle/java/testlibrary/Platform.java

@@ -34,6 +34,7 @@ public class Platform {
     private static final String osArch      = System.getProperty("os.arch");
     private static final String vmName      = System.getProperty("java.vm.name");
     private static final String userName    = System.getProperty("user.name");
+    private static final String compiler    = System.getProperty("sun.management.compiler");
 
     public static boolean isClient() {
         return vmName.endsWith(" Client VM");
@@ -55,6 +56,10 @@ public class Platform {
         return vmName.contains("Embedded");
     }
 
+    public static boolean isTieredSupported() {
+        return compiler.contains("Tiered Compilers");
+    }
+
     public static boolean is32bit() {
         return dataModel.equals("32");
     }

hotspot/test/testlibrary_tests/TestMutuallyExclusivePlatformPredicates.java

@@ -48,7 +48,7 @@ public class TestMutuallyExclusivePlatformPredicates {
         OS("isLinux", "isSolaris", "isWindows", "isOSX"),
         VM_TYPE("isClient", "isServer", "isGraal", "isMinimal"),
         IGNORED("isEmbedded", "isDebugBuild", "shouldSAAttach",
-                "canPtraceAttachLinux", "canAttachOSX");
+                "canPtraceAttachLinux", "canAttachOSX", "isTieredSupported");
 
         public final List<String> methodNames;
 

hotspot/test/testlibrary_tests/TestPlatformIsTieredSupported.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.
+ */
+
+import com.oracle.java.testlibrary.Asserts;
+import com.oracle.java.testlibrary.Platform;
+import sun.hotspot.WhiteBox;
+
+/**
+ * @test
+ * @summary Verifies that Platform::isTieredSupported returns correct value.
+ * @library /testlibrary /../../test/lib
+ * @build TestPlatformIsTieredSupported
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ *                              sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:+TieredCompilation
+ *                   TestPlatformIsTieredSupported
+ */
+public class TestPlatformIsTieredSupported {
+    public static void main(String args[]) {
+        WhiteBox whiteBox = WhiteBox.getWhiteBox();
+        boolean tieredCompilation = whiteBox.getBooleanVMFlag(
+                "TieredCompilation");
+        Asserts.assertEQ(Platform.isTieredSupported(), tieredCompilation,
+                "Platform::isTieredSupported should report the same value as "
+                        + "TieredCompilation flag's value when "
+                        + "+TieredCompilation was explicitly passed to JVM.");
+    }
+}