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
wrap_copy(const void * ptr,const size_t len,const void * tag)30 void* 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
free_copy(void * p)42 bool 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
print_on(outputStream * st) const55 void 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