8332074: Create a "jdk.exploded" test property to check if the testee jdk is exploded

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"
@@ -2121,6 +2122,10 @@ WB_ENTRY(jboolean, WB_IsCDSIncluded(JNIEnv* env))
 #endif // INCLUDE_CDS
 WB_END
 
+WB_ENTRY(jboolean, WB_IsJdkExploded(JNIEnv* env))
+  return  !ClassLoader::has_jrt_entry();
+WB_END
+
 WB_ENTRY(jboolean, WB_isC2OrJVMCIIncluded(JNIEnv* env))
 #if COMPILER2_OR_JVMCI
   return true;
@@ -2875,6 +2880,7 @@ static JNINativeMethod methods[] = {
   {CC"linkClass",          CC"(Ljava/lang/Class;)V",  (void*)&WB_LinkClass},
   {CC"areOpenArchiveHeapObjectsMapped",   CC"()Z",    (void*)&WB_AreOpenArchiveHeapObjectsMapped},
   {CC"isCDSIncluded",                     CC"()Z",    (void*)&WB_IsCDSIncluded },
+  {CC"isJdkExploded",                     CC"()Z",    (void*)&WB_IsJdkExploded },
   {CC"isJFRIncluded",                     CC"()Z",    (void*)&WB_IsJFRIncluded },
   {CC"isDTraceIncluded",                  CC"()Z",    (void*)&WB_IsDTraceIncluded },
   {CC"hasLibgraal",                       CC"()Z",    (void*)&WB_HasLibgraal },

test/hotspot/jtreg/TEST.ROOT

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2005, 2023, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2005, 2024, 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
@@ -87,7 +87,8 @@ requires.properties= \
     vm.musl \
     vm.flagless \
     docker.support \
-    jdk.containerized
+    jdk.containerized \
+    jdk.exploded
 
 # Minimum jtreg version
 requiredVersion=7.3.1+1

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

@@ -1,5 +1,6 @@
 /*
- * Copyright (c) 2013, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2023, 2024, Red Hat, Inc. All rights reserved.
+ * Copyright (c) 2023, 2024, 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
@@ -26,6 +27,9 @@
  * @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 !jdk.exploded
+ *
  * @requires (os.family != "windows") & (os.family != "aix")
  * @library /test/lib
  * @modules java.base/jdk.internal.misc

test/jdk/TEST.ROOT

@@ -102,7 +102,8 @@ requires.properties= \
     docker.support \
     release.implementor \
     jdk.containerized \
-    jdk.foreign.linker
+    jdk.foreign.linker \
+    jdk.exploded
 
 # Minimum jtreg version
 requiredVersion=7.3.1+1

test/jtreg-ext/requires/VMProps.java

@@ -120,6 +120,7 @@ public Map<String, String> call() {
         map.put("vm.cds", this::vmCDS);
         map.put("vm.cds.custom.loaders", this::vmCDSForCustomLoaders);
         map.put("vm.cds.write.archived.java.heap", this::vmCDSCanWriteArchivedJavaHeap);
+        map.put("jdk.exploded", this::jdkExploded);
         map.put("vm.continuations", this::vmContinuations);
         // vm.graal.enabled is true if Graal is used as JIT
         map.put("vm.graal.enabled", this::isGraalEnabled);
@@ -135,6 +136,7 @@ public Map<String, String> call() {
         map.put("jdk.containerized", this::jdkContainerized);
         map.put("vm.flagless", this::isFlagless);
         map.put("jdk.foreign.linker", this::jdkForeignLinker);
+
         vmGC(map); // vm.gc.X = true/false
         vmGCforCDS(map); // may set vm.gc
         vmOptFinalFlags(map);
@@ -465,6 +467,15 @@ protected String vmCDSCanWriteArchivedJavaHeap() {
         return "" + ("true".equals(vmCDS()) && WB.canWriteJavaHeapArchive());
     }
 
+    /**
+     * Check whether the test JDK is exploded. An exploded JDK will prohibit use of CDS.
+     *
+     * @return true if JDK is exploded
+     */
+    protected String jdkExploded() {
+        return "" + WB.isJdkExploded();
+    }
+
     /**
      * @return "true" if this VM supports continuations.
      */

test/lib/jdk/test/whitebox/WhiteBox.java

@@ -734,6 +734,7 @@ public Object getMethodOption(Executable method, String name) {
   public native boolean areSharedStringsMapped();
   public native boolean isSharedInternedString(String s);
   public native boolean isCDSIncluded();
+  public native boolean isJdkExploded();
   public native boolean isJFRIncluded();
   public native boolean isDTraceIncluded();
   public native boolean canWriteJavaHeapArchive();