hotspot/src/share/vm/memory/metachunk.cpp
author stefank
Tue, 15 Oct 2013 14:32:20 +0200
changeset 20730 59f433c86d9d
parent 20729 0a687ee7097d
child 24424 2658d7834c6e
permissions -rw-r--r--
8026392: Metachunks and Metablocks are using a too large alignment Reviewed-by: coleenp, jmasa
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/*
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 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "memory/allocation.hpp"
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#include "memory/metachunk.hpp"
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#include "utilities/copy.hpp"
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#include "utilities/debug.hpp"
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class VirtualSpaceNode;
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const size_t metadata_chunk_initialize = 0xf7f7f7f7;
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size_t Metachunk::object_alignment() {
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  // Must align pointers and sizes to 8,
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  // so that 64 bit types get correctly aligned.
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  const size_t alignment = 8;
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  // Make sure that the Klass alignment also agree.
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  STATIC_ASSERT(alignment == (size_t)KlassAlignmentInBytes);
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  return alignment;
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}
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size_t Metachunk::overhead() {
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  return align_size_up(sizeof(Metachunk), object_alignment()) / BytesPerWord;
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}
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// Metachunk methods
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Metachunk::Metachunk(size_t word_size,
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                     VirtualSpaceNode* container)
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    : Metabase<Metachunk>(word_size),
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    _top(NULL),
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    _container(container)
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{
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  _top = initial_top();
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#ifdef ASSERT
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  set_is_tagged_free(false);
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  size_t data_word_size = pointer_delta(end(),
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                                        _top,
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                                        sizeof(MetaWord));
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  Copy::fill_to_words((HeapWord*)_top,
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                      data_word_size,
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                      metadata_chunk_initialize);
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#endif
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}
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MetaWord* Metachunk::allocate(size_t word_size) {
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  MetaWord* result = NULL;
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  // If available, bump the pointer to allocate.
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  if (free_word_size() >= word_size) {
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    result = _top;
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    _top = _top + word_size;
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  }
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  return result;
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}
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// _bottom points to the start of the chunk including the overhead.
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size_t Metachunk::used_word_size() const {
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  return pointer_delta(_top, bottom(), sizeof(MetaWord));
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}
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size_t Metachunk::free_word_size() const {
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  return pointer_delta(end(), _top, sizeof(MetaWord));
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}
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void Metachunk::print_on(outputStream* st) const {
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  st->print_cr("Metachunk:"
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               " bottom " PTR_FORMAT " top " PTR_FORMAT
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               " end " PTR_FORMAT " size " SIZE_FORMAT,
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               bottom(), _top, end(), word_size());
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  if (Verbose) {
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    st->print_cr("    used " SIZE_FORMAT " free " SIZE_FORMAT,
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                 used_word_size(), free_word_size());
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  }
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}
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#ifndef PRODUCT
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void Metachunk::mangle() {
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  // Mangle the payload of the chunk and not the links that
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  // maintain list of chunks.
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  HeapWord* start = (HeapWord*)(bottom() + overhead());
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  size_t size = word_size() - overhead();
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  Copy::fill_to_words(start, size, metadata_chunk_initialize);
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}
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#endif // PRODUCT
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void Metachunk::verify() {
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#ifdef ASSERT
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  // Cannot walk through the blocks unless the blocks have
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  // headers with sizes.
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  assert(bottom() <= _top &&
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         _top <= (MetaWord*)end(),
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         "Chunk has been smashed");
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#endif
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  return;
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}
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/////////////// Unit tests ///////////////
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#ifndef PRODUCT
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class TestMetachunk {
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 public:
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  static void test() {
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    size_t size = 2 * 1024 * 1024;
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    void* memory = malloc(size);
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    assert(memory != NULL, "Failed to malloc 2MB");
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    Metachunk* metachunk = ::new (memory) Metachunk(size / BytesPerWord, NULL);
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    assert(metachunk->bottom() == (MetaWord*)metachunk, "assert");
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    assert(metachunk->end() == (uintptr_t*)metachunk + metachunk->size(), "assert");
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    // Check sizes
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    assert(metachunk->size() == metachunk->word_size(), "assert");
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    assert(metachunk->word_size() == pointer_delta(metachunk->end(), metachunk->bottom(),
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        sizeof(MetaWord*)), "assert");
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    // Check usage
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    assert(metachunk->used_word_size() == metachunk->overhead(), "assert");
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    assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert");
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    assert(metachunk->top() == metachunk->initial_top(), "assert");
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    assert(metachunk->is_empty(), "assert");
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    // Allocate
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    size_t alloc_size = 64; // Words
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    assert(is_size_aligned(alloc_size, Metachunk::object_alignment()), "assert");
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    MetaWord* mem = metachunk->allocate(alloc_size);
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    // Check post alloc
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    assert(mem == metachunk->initial_top(), "assert");
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    assert(mem + alloc_size == metachunk->top(), "assert");
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    assert(metachunk->used_word_size() == metachunk->overhead() + alloc_size, "assert");
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    assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert");
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    assert(!metachunk->is_empty(), "assert");
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    // Clear chunk
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    metachunk->reset_empty();
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    // Check post clear
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    assert(metachunk->used_word_size() == metachunk->overhead(), "assert");
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    assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert");
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    assert(metachunk->top() == metachunk->initial_top(), "assert");
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    assert(metachunk->is_empty(), "assert");
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    free(memory);
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  }
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};
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void TestMetachunk_test() {
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  TestMetachunk::test();
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}
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#endif