1/*
2 * Copyright (c) 2014, 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#include "precompiled.hpp"
25#include "memory/allocation.hpp"
26#include "memory/allocation.inline.hpp"
27#include "memory/guardedMemory.hpp"
28#include "runtime/os.hpp"
29
30void* GuardedMemory::wrap_copy(const void* ptr, const size_t len, const void* tag) {
31  size_t total_sz = GuardedMemory::get_total_size(len);
32  void* outerp = os::malloc(total_sz, mtInternal);
33  if (outerp != NULL) {
34    GuardedMemory guarded(outerp, len, tag);
35    void* innerp = guarded.get_user_ptr();
36    memcpy(innerp, ptr, len);
37    return innerp;
38  }
39  return NULL; // OOM
40}
41
42bool GuardedMemory::free_copy(void* p) {
43  if (p == NULL) {
44    return true;
45  }
46  GuardedMemory guarded((u_char*)p);
47  bool verify_ok = guarded.verify_guards();
48
49  /* always attempt to free, pass problem on to any nested memchecker */
50  os::free(guarded.release_for_freeing());
51
52  return verify_ok;
53}
54
55void GuardedMemory::print_on(outputStream* st) const {
56  if (_base_addr == NULL) {
57    st->print_cr("GuardedMemory(" PTR_FORMAT ") not associated to any memory", p2i(this));
58    return;
59  }
60  st->print_cr("GuardedMemory(" PTR_FORMAT ") base_addr=" PTR_FORMAT
61      " tag=" PTR_FORMAT " user_size=" SIZE_FORMAT " user_data=" PTR_FORMAT,
62      p2i(this), p2i(_base_addr), p2i(get_tag()), get_user_size(), p2i(get_user_ptr()));
63
64  Guard* guard = get_head_guard();
65  st->print_cr("  Header guard @" PTR_FORMAT " is %s", p2i(guard), (guard->verify() ? "OK" : "BROKEN"));
66  guard = get_tail_guard();
67  st->print_cr("  Trailer guard @" PTR_FORMAT " is %s", p2i(guard), (guard->verify() ? "OK" : "BROKEN"));
68
69  u_char udata = *get_user_ptr();
70  switch (udata) {
71  case uninitBlockPad:
72    st->print_cr("  User data appears unused");
73    break;
74  case freeBlockPad:
75    st->print_cr("  User data appears to have been freed");
76    break;
77  default:
78    st->print_cr("  User data appears to be in use");
79    break;
80  }
81}
82