padded.inline.hpp revision 13249:a2753984d2c1 
1/*
2 * Copyright (c) 2013, 2016, 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_PADDED_INLINE_HPP
26#define SHARE_VM_MEMORY_PADDED_INLINE_HPP
27
28#include "memory/allocation.inline.hpp"
29#include "memory/padded.hpp"
30#include "utilities/align.hpp"
31#include "utilities/debug.hpp"
32#include "utilities/globalDefinitions.hpp"
33
34// Creates an aligned padded array.
35// The memory can't be deleted since the raw memory chunk is not returned.
36template <class T, MEMFLAGS flags, size_t alignment>
37PaddedEnd<T>* PaddedArray<T, flags, alignment>::create_unfreeable(uint length) {
38  // Check that the PaddedEnd class works as intended.
39  STATIC_ASSERT(is_aligned_(sizeof(PaddedEnd<T>), alignment));
40
41  // Allocate a chunk of memory large enough to allow for some alignment.
42  void* chunk = AllocateHeap(length * sizeof(PaddedEnd<T, alignment>) + alignment, flags);
43
44  // Make the initial alignment.
45  PaddedEnd<T>* aligned_padded_array = (PaddedEnd<T>*)align_up(chunk, alignment);
46
47  // Call the default constructor for each element.
48  for (uint i = 0; i < length; i++) {
49    ::new (&aligned_padded_array[i]) T();
50  }
51
52  return aligned_padded_array;
53}
54
55template <class T, MEMFLAGS flags, size_t alignment>
56T** Padded2DArray<T, flags, alignment>::create_unfreeable(uint rows, uint columns, size_t* allocation_size) {
57  // Calculate and align the size of the first dimension's table.
58  size_t table_size = align_up(rows * sizeof(T*), alignment);
59  // The size of the separate rows.
60  size_t row_size = align_up(columns * sizeof(T), alignment);
61  // Total size consists of the indirection table plus the rows.
62  size_t total_size = table_size + rows * row_size + alignment;
63
64  // Allocate a chunk of memory large enough to allow alignment of the chunk.
65  void* chunk = AllocateHeap(total_size, flags);
66  // Clear the allocated memory.
67  memset(chunk, 0, total_size);
68  // Align the chunk of memory.
69  T** result = (T**)align_up(chunk, alignment);
70  void* data_start = (void*)((uintptr_t)result + table_size);
71
72  // Fill in the row table.
73  for (size_t i = 0; i < rows; i++) {
74    result[i] = (T*)((uintptr_t)data_start + i * row_size);
75  }
76
77  if (allocation_size != NULL) {
78    *allocation_size = total_size;
79  }
80
81  return result;
82}
83
84template <class T, MEMFLAGS flags, size_t alignment>
85T* PaddedPrimitiveArray<T, flags, alignment>::create_unfreeable(size_t length) {
86  // Allocate a chunk of memory large enough to allow for some alignment.
87  void* chunk = AllocateHeap(length * sizeof(T) + alignment, flags);
88
89  memset(chunk, 0, length * sizeof(T) + alignment);
90
91  return (T*)align_up(chunk, alignment);
92}
93
94#endif // SHARE_VM_MEMORY_PADDED_INLINE_HPP
95