/*

 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "runtime/safepointVerifiers.hpp"

#include "gc/shared/collectedHeap.hpp"

#include "memory/universe.hpp"

#include "utilities/debug.hpp"

// Implementation of NoGCVerifier

#ifdef ASSERT

NoGCVerifier::NoGCVerifier(bool verifygc) {

  _verifygc = verifygc;

  if (_verifygc) {

    CollectedHeap* h = Universe::heap();

    assert(!h->is_gc_active(), "GC active during NoGCVerifier");

    _old_invocations = h->total_collections();

  }

}

NoGCVerifier::~NoGCVerifier() {

  if (_verifygc) {

    CollectedHeap* h = Universe::heap();

    assert(!h->is_gc_active(), "GC active during NoGCVerifier");

    if (_old_invocations != h->total_collections()) {

      fatal("collection in a NoGCVerifier secured function");

    }

  }

}

PauseNoGCVerifier::PauseNoGCVerifier(NoGCVerifier * ngcv) {

  _ngcv = ngcv;

  if (_ngcv->_verifygc) {

    // if we were verifying, then make sure that nothing is

    // wrong before we "pause" verification

    CollectedHeap* h = Universe::heap();

    assert(!h->is_gc_active(), "GC active during NoGCVerifier");

    if (_ngcv->_old_invocations != h->total_collections()) {

      fatal("collection in a NoGCVerifier secured function");

    }

  }

}

PauseNoGCVerifier::~PauseNoGCVerifier() {

  if (_ngcv->_verifygc) {

    // if we were verifying before, then reenable verification

    CollectedHeap* h = Universe::heap();

    assert(!h->is_gc_active(), "GC active during NoGCVerifier");

    _ngcv->_old_invocations = h->total_collections();

  }

}

#endif