jdk8-mips64-public/hotspot: src/share/vm/memory/metachunk.cpp@6f817ce50129 (annotated)

src/share/vm/memory/metachunk.cpp@6f817ce50129 (annotated)

src/share/vm/memory/metachunk.cpp

Fri, 19 Apr 2013 11:08:52 -0700

author: minqi
date: Fri, 19 Apr 2013 11:08:52 -0700
changeset 4962: 6f817ce50129
parent 4382: e51c9860cf66
child 5007: c23dbf0e8ab7
permissions: -rw-r--r--

8010992: Remove calls to global ::operator new[] and new
Summary: disable use of global operator new and new[] which could cause unexpected exception and escape from NMT tracking.
Reviewed-by: coleenp, dholmes, zgu
Contributed-by: yumin.qi@oracle.com

 /*
  * Copyright (c) 2012, 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/metachunk.hpp"
 #include "utilities/copy.hpp"
 #include "utilities/debug.hpp"
 //
 // Future modification
 //
 // The Metachunk can conceivable be replaced by the Chunk in
 // allocation.hpp.  Note that the latter Chunk is the space for
 // allocation (allocations from the chunk are out of the space in
 // the Chunk after the header for the Chunk) where as Metachunks
 // point to space in a VirtualSpace.  To replace Metachunks with
 // Chunks, change Chunks so that they can be allocated out of a VirtualSpace.
 const size_t metadata_chunk_initialize = 0xf7f7f7f7;
 size_t Metachunk::_overhead =
   Chunk::aligned_overhead_size(sizeof(Metachunk)) / BytesPerWord;
 // Metachunk methods
 Metachunk* Metachunk::initialize(MetaWord* ptr, size_t word_size) {
   // Set bottom, top, and end.  Allow space for the Metachunk itself
   Metachunk* chunk = (Metachunk*) ptr;
   MetaWord* chunk_bottom = ptr + _overhead;
   chunk->set_bottom(ptr);
   chunk->set_top(chunk_bottom);
   MetaWord* chunk_end = ptr + word_size;
   assert(chunk_end > chunk_bottom, "Chunk must be too small");
   chunk->set_end(chunk_end);
   chunk->set_next(NULL);
   chunk->set_prev(NULL);
   chunk->set_word_size(word_size);
 #ifdef ASSERT
   size_t data_word_size = pointer_delta(chunk_end, chunk_bottom, sizeof(MetaWord));
   Copy::fill_to_words((HeapWord*) chunk_bottom, data_word_size, metadata_chunk_initialize);
 #endif
   return chunk;
 }
 MetaWord* Metachunk::allocate(size_t word_size) {
   MetaWord* result = NULL;
   // If available, bump the pointer to allocate.
   if (free_word_size() >= word_size) {
     result = _top;
     _top = _top + word_size;
   }
   return result;
 }
 // _bottom points to the start of the chunk including the overhead.
 size_t Metachunk::used_word_size() const {
   return pointer_delta(_top, _bottom, sizeof(MetaWord));
 }
 size_t Metachunk::free_word_size() const {
   return pointer_delta(_end, _top, sizeof(MetaWord));
 }
 size_t Metachunk::capacity_word_size() const {
   return pointer_delta(_end, _bottom, sizeof(MetaWord));
 }
 void Metachunk::print_on(outputStream* st) const {
   st->print_cr("Metachunk:"
                " bottom " PTR_FORMAT " top " PTR_FORMAT
                " end " PTR_FORMAT " size " SIZE_FORMAT,
                bottom(), top(), end(), word_size());
   if (Verbose) {
     st->print_cr("    used " SIZE_FORMAT " free " SIZE_FORMAT,
                  used_word_size(), free_word_size());
   }
 }
 #ifndef PRODUCT
 void Metachunk::mangle() {
   // Mangle the payload of the chunk and not the links that
   // maintain list of chunks.
   HeapWord* start = (HeapWord*)(bottom() + overhead());
   size_t word_size = capacity_word_size() - overhead();
   Copy::fill_to_words(start, word_size, metadata_chunk_initialize);
 }
 #endif // PRODUCT
 void Metachunk::verify() {
 #ifdef ASSERT
   // Cannot walk through the blocks unless the blocks have
   // headers with sizes.
   assert(_bottom <= _top &&
          _top <= _end,
          "Chunk has been smashed");
 #endif
   return;
 }

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src/share/vm/memory/metachunk.cpp@6f817ce50129 (annotated)

src/share/vm/memory/metachunk.cpp