/*

 * 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

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 */

#include "precompiled.hpp"

#include "gc_implementation/concurrentMarkSweep/freeChunk.hpp"

#include "memory/freeBlockDictionary.hpp"

#include "utilities/copy.hpp"

#ifndef PRODUCT

#define baadbabeHeapWord badHeapWordVal

#define deadbeefHeapWord 0xdeadbeef

size_t const FreeChunk::header_size() {

  return sizeof(FreeChunk)/HeapWordSize;

}

void FreeChunk::mangleAllocated(size_t size) {

  // mangle all but the header of a just-allocated block

  // of storage

  assert(size >= MinChunkSize, "smallest size of object");

  // we can't assert that _size == size because this may be an

  // allocation out of a linear allocation block

  assert(sizeof(FreeChunk) % HeapWordSize == 0,

         "shouldn't write beyond chunk");

  HeapWord* addr = (HeapWord*)this;

  size_t hdr = header_size();

  Copy::fill_to_words(addr + hdr, size - hdr, baadbabeHeapWord);

}

void FreeChunk::mangleFreed(size_t sz) {

  assert(baadbabeHeapWord != deadbeefHeapWord, "Need distinct patterns");

  // mangle all but the header of a just-freed block of storage

  // just prior to passing it to the storage dictionary

  assert(sz >= MinChunkSize, "smallest size of object");

  assert(sz == size(), "just checking");

  HeapWord* addr = (HeapWord*)this;

  size_t hdr = header_size();

  Copy::fill_to_words(addr + hdr, sz - hdr, deadbeefHeapWord);

}

void FreeChunk::verifyList() const {

  FreeChunk* nextFC = next();

  if (nextFC != NULL) {

    assert(this == nextFC->prev(), "broken chain");

    assert(size() == nextFC->size(), "wrong size");

    nextFC->verifyList();

  }

}

#endif

void FreeChunk::print_on(outputStream* st) {

  st->print_cr("Next: " PTR_FORMAT " Prev: " PTR_FORMAT " %s",

    next(), prev(), cantCoalesce() ? "[can't coalesce]" : "");

}