/*

 * Copyright (c) 2014, 2016, 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 "memory/allocation.hpp"

#include "memory/allocation.inline.hpp"

#include "memory/guardedMemory.hpp"

#include "runtime/os.hpp"

void* GuardedMemory::wrap_copy(const void* ptr, const size_t len, const void* tag) {

  size_t total_sz = GuardedMemory::get_total_size(len);

  void* outerp = os::malloc(total_sz, mtInternal);

  if (outerp != NULL) {

    GuardedMemory guarded(outerp, len, tag);

    void* innerp = guarded.get_user_ptr();

    memcpy(innerp, ptr, len);

    return innerp;

  }

  return NULL; // OOM

}

bool GuardedMemory::free_copy(void* p) {

  if (p == NULL) {

    return true;

  }

  GuardedMemory guarded((u_char*)p);

  bool verify_ok = guarded.verify_guards();

  /* always attempt to free, pass problem on to any nested memchecker */

  os::free(guarded.release_for_freeing());

  return verify_ok;

}

void GuardedMemory::print_on(outputStream* st) const {

  if (_base_addr == NULL) {

    st->print_cr("GuardedMemory(" PTR_FORMAT ") not associated to any memory", p2i(this));

    return;

  }

  st->print_cr("GuardedMemory(" PTR_FORMAT ") base_addr=" PTR_FORMAT

      " tag=" PTR_FORMAT " user_size=" SIZE_FORMAT " user_data=" PTR_FORMAT,

      p2i(this), p2i(_base_addr), p2i(get_tag()), get_user_size(), p2i(get_user_ptr()));

  Guard* guard = get_head_guard();

  st->print_cr("  Header guard @" PTR_FORMAT " is %s", p2i(guard), (guard->verify() ? "OK" : "BROKEN"));

  guard = get_tail_guard();

  st->print_cr("  Trailer guard @" PTR_FORMAT " is %s", p2i(guard), (guard->verify() ? "OK" : "BROKEN"));

  u_char udata = *get_user_ptr();

  switch (udata) {

  case uninitBlockPad:

    st->print_cr("  User data appears unused");

    break;

  case freeBlockPad:

    st->print_cr("  User data appears to have been freed");

    break;

  default:

    st->print_cr("  User data appears to be in use");

    break;

  }

}