view src/share/vm/memory/generation.inline.hpp @ 12301:2c022e432e10

8024974: Incorrect use of GC_locker::is_active() Summary: SymbolTable and StringTable can make calls to GC_locker::is_active() outside a safepoint. This isn't safe because the GC_locker active state (lock count) is only updated at a safepoint and only remains valid as long as _needs_gc is true. However, outside a safepoint_needs_gc can change to false at any time, which makes it impossible to do a correct call to is_active() in that context. In this case these calls can just be removed since the input argument to basic_add() should never be on the heap and so there's no need to check the GC_locker state. This change also adjusts the assert() in is_active() to makes sure all calls to this function are always done under a safepoint. Reviewed-by: brutisso, dcubed Contributed-by: per.liden@oracle.com
author stefank
date Fri, 20 Sep 2013 10:53:28 +0200
parents f95d63e2154a
children
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/*
 * Copyright (c) 2000, 2010, 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
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 * questions.
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 */

#ifndef SHARE_VM_MEMORY_GENERATION_INLINE_HPP
#define SHARE_VM_MEMORY_GENERATION_INLINE_HPP

#include "memory/genCollectedHeap.hpp"
#include "memory/generation.hpp"
#include "memory/space.hpp"

bool OneContigSpaceCardGeneration::is_in(const void* p) const {
  return the_space()->is_in(p);
}


WaterMark OneContigSpaceCardGeneration::top_mark() {
  return the_space()->top_mark();
}

CompactibleSpace*
OneContigSpaceCardGeneration::first_compaction_space() const {
  return the_space();
}

HeapWord* OneContigSpaceCardGeneration::allocate(size_t word_size,
                                                 bool is_tlab) {
  assert(!is_tlab, "OneContigSpaceCardGeneration does not support TLAB allocation");
  return the_space()->allocate(word_size);
}

HeapWord* OneContigSpaceCardGeneration::par_allocate(size_t word_size,
                                                     bool is_tlab) {
  assert(!is_tlab, "OneContigSpaceCardGeneration does not support TLAB allocation");
  return the_space()->par_allocate(word_size);
}

WaterMark OneContigSpaceCardGeneration::bottom_mark() {
  return the_space()->bottom_mark();
}

size_t OneContigSpaceCardGeneration::block_size(const HeapWord* addr) const {
  if (addr < the_space()->top()) return oop(addr)->size();
  else {
    assert(addr == the_space()->top(), "non-block head arg to block_size");
    return the_space()->_end - the_space()->top();
  }
}

bool OneContigSpaceCardGeneration::block_is_obj(const HeapWord* addr) const {
  return addr < the_space()->top();
}

#endif // SHARE_VM_MEMORY_GENERATION_INLINE_HPP