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 "classfile/classLoaderData.hpp"
  29 #include "utilities/array.hpp"
  30 #include "utilities/exceptions.hpp"
  31 #include "utilities/globalDefinitions.hpp"
  32 
  33 class MetadataFactory : AllStatic {
  34  public:
  35   template <typename T>
  36   static Array<T>* new_array(ClassLoaderData* loader_data, int length, TRAPS) {
  37     // The "true" argument is because all metadata arrays are read only when
  38     // dumped to the shared archive
  39     return new (loader_data, length, /*read_only*/true, THREAD) Array<T>(length);
  40   }
  41 
  42   template <typename T>
  43   static Array<T>* new_array(ClassLoaderData* loader_data, int length, T value, TRAPS) {
  44     Array<T>* array = new_array<T>(loader_data, length, CHECK_NULL);
  45     for (int i = 0; i < length; i++) {
  46       array->at_put(i, value);
  47     }
  48     return array;
  49   }
  50 
  51   template <typename T>
  52   static Array<T>* new_writeable_array(ClassLoaderData* loader_data, int length, TRAPS) {
  53     return new (loader_data, length, /*read_only*/false, THREAD) Array<T>(length);
  54   }
  55 
  56   template <typename T>
  57   static Array<T>* new_writeable_array(ClassLoaderData* loader_data, int length, T value, TRAPS) {
  58     Array<T>* array = new_writeable_array<T>(loader_data, length, CHECK_NULL);
  59     for (int i = 0; i < length; i++) {
  60       array->at_put(i, value);
  61     }
  62     return array;
  63   }
  64 
  65   template <typename T>
  66   static void free_array(ClassLoaderData* loader_data, Array<T>* data) {
  67     if (data != NULL) {
  68       assert(loader_data != NULL, "shouldn't pass null");
  69       assert(!data->is_shared(), "cannot deallocate array in shared spaces");
  70       int size = data->size();
  71       if (DumpSharedSpaces) {
  72         loader_data->ro_metaspace()->deallocate((MetaWord*)data, size, false);
  73       } else {
  74         loader_data->metaspace_non_null()->deallocate((MetaWord*)data, size, false);
  75       }
  76     }
  77   }
  78 
  79   // Deallocation method for metadata
  80   template <class T>
  81   static void free_metadata(ClassLoaderData* loader_data, T md) {
  82     if (DumpSharedSpaces) {
  83       // FIXME: the freeing code is buggy, especially when PrintSharedSpaces is enabled.
  84       // Disable for now -- this means if you specify bad classes in your classlist you
  85       // may have wasted space inside the archive.
  86       return;
  87     }
  88     if (md != NULL) {
  89       assert(loader_data != NULL, "shouldn't pass null");
  90       int size = md->size();
  91       // Call metadata's deallocate function which will call deallocate fields
  92       assert(!DumpSharedSpaces, "cannot deallocate metadata when dumping CDS archive");
  93       assert(!md->on_stack(), "can't deallocate things on stack");
  94       assert(!md->is_shared(), "cannot deallocate if in shared spaces");
  95       md->deallocate_contents(loader_data);
  96       loader_data->metaspace_non_null()->deallocate((MetaWord*)md, size, md->is_klass());
  97     }
  98   }
  99 };
 100 
 101 #endif // SHARE_VM_MEMORY_METADATAFACTORY_HPP