src/share/vm/jvmci/jvmciCodeInstaller.cpp

@@ -175,11 +175,17 @@
     }
   }
   return map;
 }
 
-Metadata* CodeInstaller::record_metadata_reference(Handle constant, TRAPS) {
+void* CodeInstaller::record_metadata_reference(Handle constant, TRAPS) {
+  /*
+   * This method needs to return a raw (untyped) pointer, since the value of a pointer to the base
+   * class is in general not equal to the pointer of the subclass. When patching metaspace pointers,
+   * the compiler expects a direct pointer to the subclass (Klass*, Method* or Symbol*), not a
+   * pointer to the base class (Metadata* or MetaspaceObj*).
+   */
   oop obj = HotSpotMetaspaceConstantImpl::metaspaceObject(constant);
   if (obj->is_a(HotSpotResolvedObjectTypeImpl::klass())) {
     Klass* klass = java_lang_Class::as_Klass(HotSpotResolvedObjectTypeImpl::javaClass(obj));
     assert(!HotSpotMetaspaceConstantImpl::compressed(constant), "unexpected compressed klass pointer %s @ " INTPTR_FORMAT, klass->name()->as_C_string(), p2i(klass));
     int index = _oop_recorder->find_index(klass);

@@ -189,10 +195,15 @@
     Method* method = (Method*) (address) HotSpotResolvedJavaMethodImpl::metaspaceMethod(obj);
     assert(!HotSpotMetaspaceConstantImpl::compressed(constant), "unexpected compressed method pointer %s @ " INTPTR_FORMAT, method->name()->as_C_string(), p2i(method));
     int index = _oop_recorder->find_index(method);
     TRACE_jvmci_3("metadata[%d of %d] = %s", index, _oop_recorder->metadata_count(), method->name()->as_C_string());
     return method;
+  } else if (obj->is_a(HotSpotSymbol::klass())) {
+    Symbol* symbol = (Symbol*) (address) HotSpotSymbol::pointer(obj);
+    assert(!HotSpotMetaspaceConstantImpl::compressed(constant), "unexpected compressed symbol pointer %s @ " INTPTR_FORMAT, symbol->as_C_string(), p2i(symbol));
+    TRACE_jvmci_3("symbol = %s", symbol->as_C_string());
+    return symbol;
   } else {
     JVMCI_ERROR_NULL("unexpected metadata reference for constant of type %s", obj->klass()->signature_name());
   }
 }
 

@@ -704,11 +715,11 @@
         *((narrowKlass*) dest) = record_narrow_metadata_reference(constant, CHECK_OK);
 #else
         JVMCI_ERROR_OK("unexpected compressed Klass* in 32-bit mode");
 #endif
       } else {
-        *((Metadata**) dest) = record_metadata_reference(constant, CHECK_OK);
+        *((void**) dest) = record_metadata_reference(constant, CHECK_OK);
       }
     } else if (constant->is_a(HotSpotObjectConstantImpl::klass())) {
       Handle obj = HotSpotObjectConstantImpl::object(constant);
       jobject value = JNIHandles::make_local(obj());
       int oop_index = _oop_recorder->find_index(value);