8332105: Exploded JDK does not include CDS

Reviewed-by: dholmes, iklam

Author: tstuefe

src/hotspot/share/prims/whitebox.cpp

@@ -29,6 +29,7 @@
 #include "cds/filemap.hpp"
 #include "cds/heapShared.hpp"
 #include "cds/metaspaceShared.hpp"
+#include "classfile/classLoader.hpp"
 #include "classfile/classLoaderDataGraph.hpp"
 #include "classfile/classLoaderStats.hpp"
 #include "classfile/classPrinter.hpp"
@@ -2115,7 +2116,10 @@ WB_END
 
 WB_ENTRY(jboolean, WB_IsCDSIncluded(JNIEnv* env))
 #if INCLUDE_CDS
-  return true;
+  // An exploded build inhibits use of CDS. Therefore, for the
+  // purpose of testing, the JVM can be treated as not having CDS
+  // built in at all.
+  return ClassLoader::has_jrt_entry();
 #else
   return false;
 #endif // INCLUDE_CDS

test/hotspot/jtreg/runtime/CompressedOops/CompressedCPUSpecificClassSpaceReservation.java

@@ -26,6 +26,7 @@
  * @summary Test the various CPU-specific reservation schemes
  * @requires vm.bits == 64 & !vm.graal.enabled & vm.debug == true
  * @requires vm.flagless
+ * @requires vm.cds
  * @requires (os.family != "windows") & (os.family != "aix")
  * @library /test/lib
  * @modules java.base/jdk.internal.misc