1 /*
   2  * Copyright (c) 2010, 2013, 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
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_MEMORY_METADATAFACTORY_HPP
  26 #define SHARE_VM_MEMORY_METADATAFACTORY_HPP
  27 
  28 #include "utilities/array.hpp"
  29 #include "utilities/exceptions.hpp"
  30 #include "utilities/globalDefinitions.hpp"
  31 
  32 class MetadataFactory : AllStatic {
  33  public:
  34   template <typename T>
  35   static Array<T>* new_array(ClassLoaderData* loader_data, int length, TRAPS) {
  36     // The "true" argument is because all metadata arrays are read only when
  37     // dumped to the shared archive
  38     return new (loader_data, length, /*read_only*/true, THREAD) Array<T>(length);
  39   }
  40 
  41   template <typename T>
  42   static Array<T>* new_array(ClassLoaderData* loader_data, int length, T value, TRAPS) {
  43     Array<T>* array = new_array<T>(loader_data, length, CHECK_NULL);
  44     for (int i = 0; i < length; i++) {
  45       array->at_put(i, value);
  46     }
  47     return array;
  48   }
  49 
  50   template <typename T>
  51   static Array<T>* new_writeable_array(ClassLoaderData* loader_data, int length, TRAPS) {
  52     return new (loader_data, length, /*read_only*/false, THREAD) Array<T>(length);
  53   }
  54 
  55   template <typename T>
  56   static Array<T>* new_writeable_array(ClassLoaderData* loader_data, int length, T value, TRAPS) {
  57     Array<T>* array = new_writeable_array<T>(loader_data, length, CHECK_NULL);
  58     for (int i = 0; i < length; i++) {
  59       array->at_put(i, value);
  60     }
  61     return array;
  62   }
  63 
  64   template <typename T>
  65   static void free_array(ClassLoaderData* loader_data, Array<T>* data) {
  66     if (data != NULL) {
  67       assert(loader_data != NULL, "shouldn't pass null");
  68       assert(!data->is_shared(), "cannot deallocate array in shared spaces");
  69       int size = data->size();
  70       if (DumpSharedSpaces) {
  71         loader_data->ro_metaspace()->deallocate((MetaWord*)data, size, false);
  72       } else {
  73         loader_data->metaspace_non_null()->deallocate((MetaWord*)data, size, false);
  74       }
  75     }
  76   }
  77 
  78   // Deallocation method for metadata
  79   template <class T>
  80   static void free_metadata(ClassLoaderData* loader_data, T md) {
  81     if (md != NULL) {
  82       assert(loader_data != NULL, "shouldn't pass null");
  83       int size = md->size();
  84       // Call metadata's deallocate function which will call deallocate fields
  85       assert(!DumpSharedSpaces, "cannot deallocate metadata when dumping CDS archive");
  86       assert(!md->on_stack(), "can't deallocate things on stack");
  87       assert(!md->is_shared(), "cannot deallocate if in shared spaces");
  88       md->deallocate_contents(loader_data);
  89       loader_data->metaspace_non_null()->deallocate((MetaWord*)md, size, md->is_klass());
  90     }
  91   }
  92 };
  93 
  94 #endif // SHARE_VM_MEMORY_METADATAFACTORY_HPP