src/hotspot/share/prims/whitebox.cpp

@@ -176,10 +176,19 @@
   ClassLoaderDataGraph::classes_do(&closure);
 
   return closure.found();
 WB_END
 
+WB_ENTRY(jint, WB_GetSymbolRefcount(JNIEnv* env, jobject unused, jstring name))
+  oop h_name = JNIHandles::resolve(name);
+  if (h_name == NULL) return false;
+  Symbol* sym = java_lang_String::as_symbol(h_name, CHECK_0);
+  TempNewSymbol tsym(sym); // Make sure to decrement reference count on sym on return
+  return (jint)sym->refcount();
+WB_END
+
+
 WB_ENTRY(void, WB_AddToBootstrapClassLoaderSearch(JNIEnv* env, jobject o, jstring segment)) {
 #if INCLUDE_JVMTI
   ResourceMark rm;
   const char* seg = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(segment));
   JvmtiEnv* jvmti_env = JvmtiEnv::create_a_jvmti(JVMTI_VERSION);

@@ -1980,11 +1989,10 @@
 
 WB_ENTRY(jint, WB_ProtectionDomainRemovedCount(JNIEnv* env, jobject o))
   return (jint) SystemDictionary::pd_cache_table()->removed_entries_count();
 WB_END
 
-
 #define CC (char*)
 
 static JNINativeMethod methods[] = {
   {CC"getObjectAddress0",                CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress  },
   {CC"getObjectSize0",                   CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectSize     },

@@ -1994,10 +2002,11 @@
   {CC"getVMAllocationGranularity",       CC"()J",                   (void*)&WB_GetVMAllocationGranularity },
   {CC"getVMLargePageSize",               CC"()J",                   (void*)&WB_GetVMLargePageSize},
   {CC"getHeapSpaceAlignment",            CC"()J",                   (void*)&WB_GetHeapSpaceAlignment},
   {CC"getHeapAlignment",                 CC"()J",                   (void*)&WB_GetHeapAlignment},
   {CC"isClassAlive0",                    CC"(Ljava/lang/String;)Z", (void*)&WB_IsClassAlive      },
+  {CC"getSymbolRefcount",                CC"(Ljava/lang/String;)I", (void*)&WB_GetSymbolRefcount },
   {CC"parseCommandLine0",
       CC"(Ljava/lang/String;C[Lsun/hotspot/parser/DiagnosticCommand;)[Ljava/lang/Object;",
       (void*) &WB_ParseCommandLine
   },
   {CC"addToBootstrapClassLoaderSearch0", CC"(Ljava/lang/String;)V",