1 /*
   2  * Copyright (c) 2010, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
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  23  */
  24 
  25 #ifndef SHARE_MEMORY_METADATAFACTORY_HPP
  26 #define SHARE_MEMORY_METADATAFACTORY_HPP
  27 
  28 #include "classfile/classLoaderData.hpp"
  29 #include "memory/metaspace.hpp"
  30 #include "oops/array.hpp"
  31 #include "utilities/exceptions.hpp"
  32 #include "utilities/globalDefinitions.hpp"
  33 
  34 class MetadataFactory : AllStatic {
  35  public:
  36   template <typename T>
  37   static Array<T>* new_array(ClassLoaderData* loader_data, int length, TRAPS) {
  38     // The "true" argument is because all metadata arrays are read only when
  39     // dumped to the shared archive
  40     return new (loader_data, length, THREAD) Array<T>(length);
  41   }
  42 
  43   template <typename T>
  44   static Array<T>* new_array(ClassLoaderData* loader_data, int length, T value, TRAPS) {
  45     Array<T>* array = new_array<T>(loader_data, length, CHECK_NULL);
  46     for (int i = 0; i < length; i++) {
  47       array->at_put(i, value);
  48     }
  49     return array;
  50   }
  51 
  52   template <typename T>
  53   static void free_array(ClassLoaderData* loader_data, Array<T>* data) {
  54     if (data != NULL) {
  55       assert(loader_data != NULL, "shouldn't pass null");
  56       assert(!data->is_shared(), "cannot deallocate array in shared spaces");
  57       int size = data->size();
  58       loader_data->metaspace_non_null()->deallocate((MetaWord*)data, size, false);
  59     }
  60   }
  61 
  62   // Deallocation method for metadata
  63   template <class T>
  64   static void free_metadata(ClassLoaderData* loader_data, T md) {
  65     if (md != NULL) {
  66       assert(loader_data != NULL, "shouldn't pass null");
  67       int size = md->size();
  68       // Call metadata's deallocate function which will call deallocate fields
  69       assert(!md->on_stack(), "can't deallocate things on stack");
  70       assert(!md->is_shared(), "cannot deallocate if in shared spaces");
  71       md->deallocate_contents(loader_data);
  72       loader_data->metaspace_non_null()->deallocate((MetaWord*)md, size, md->is_klass());
  73     }
  74   }
  75 };
  76 
  77 #endif // SHARE_MEMORY_METADATAFACTORY_HPP