8185436: jtreg: introduce @requires property to disable cds tests

Reviewed-by: jiangli, mseledtsov, iklam

test/jtreg-ext/requires/VMProps.java

@@ -71,6 +71,8 @@ public class VMProps implements Callable<Map<String, String>> {
         map.put("vm.rtm.cpu", vmRTMCPU());
         map.put("vm.rtm.os", vmRTMOS());
         map.put("vm.aot", vmAOT());
+        // vm.cds is true if the VM is compiled with cds support.
+        map.put("vm.cds", vmCDS());
         vmGC(map); // vm.gc.X = true/false
 
         VMProps.dump(map);
@@ -277,6 +279,19 @@ public class VMProps implements Callable<Map<String, String>> {
         return "" + Files.exists(jaotc);
     }
 
+    /**
+     * Check for CDS support.
+     *
+     * @return true if CDS is supported by the VM to be tested.
+     */
+    protected String vmCDS() {
+        if (WB.isCDSIncludedInVmBuild()) {
+            return "true";
+        } else {
+            return "false";
+        }
+    }
+
     /**
      * Dumps the map to the file if the file name is given as the property.
      * This functionality could be helpful to know context in the real

test/lib/sun/hotspot/WhiteBox.java

@@ -523,6 +523,7 @@ public class WhiteBox {
   public native boolean isShared(Object o);
   public native boolean isSharedClass(Class<?> c);
   public native boolean areSharedStringsIgnored();
+  public native boolean isCDSIncludedInVmBuild();
 
   // Compiler Directive
   public native int addCompilerDirective(String compDirect);