1/*
2 * Copyright (c) 1997, 2017, 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#include "precompiled.hpp"
26#include "runtime/safepointVerifiers.hpp"
27#include "gc/shared/collectedHeap.hpp"
28#include "memory/universe.hpp"
29#include "utilities/debug.hpp"
30
31// Implementation of NoGCVerifier
32
33#ifdef ASSERT
34
35NoGCVerifier::NoGCVerifier(bool verifygc) {
36 _verifygc = verifygc;
37 if (_verifygc) {
38 CollectedHeap* h = Universe::heap();
39 assert(!h->is_gc_active(), "GC active during NoGCVerifier");
40 _old_invocations = h->total_collections();
41 }
42}
43
44
45NoGCVerifier::~NoGCVerifier() {
46 if (_verifygc) {
47 CollectedHeap* h = Universe::heap();
48 assert(!h->is_gc_active(), "GC active during NoGCVerifier");
49 if (_old_invocations != h->total_collections()) {
50 fatal("collection in a NoGCVerifier secured function");
51 }
52 }
53}
54
55PauseNoGCVerifier::PauseNoGCVerifier(NoGCVerifier * ngcv) {
56 _ngcv = ngcv;
57 if (_ngcv->_verifygc) {
58 // if we were verifying, then make sure that nothing is
59 // wrong before we "pause" verification
60 CollectedHeap* h = Universe::heap();
61 assert(!h->is_gc_active(), "GC active during NoGCVerifier");
62 if (_ngcv->_old_invocations != h->total_collections()) {
63 fatal("collection in a NoGCVerifier secured function");
64 }
65 }
66}
67
68
69PauseNoGCVerifier::~PauseNoGCVerifier() {
70 if (_ngcv->_verifygc) {
71 // if we were verifying before, then reenable verification
72 CollectedHeap* h = Universe::heap();
73 assert(!h->is_gc_active(), "GC active during NoGCVerifier");
74 _ngcv->_old_invocations = h->total_collections();
75 }
76}
77
78#endif
79