Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/shared/immutableSpace.hpp @ 1716:be3f9c242c9d
6948538: CMS: BOT walkers can fall into object allocation and initialization cracks
Summary: GC workers now recognize an intermediate transient state of blocks which are allocated but have not yet completed initialization. blk_start() calls do not attempt to determine the size of a block in the transient state, rather waiting for the block to become initialized so that it is safe to query its size. Audited and ensured the order of initialization of object fields (klass, free bit and size) to respect block state transition protocol. Also included some new assertion checking code enabled in debug mode.
Reviewed-by: chrisphi, johnc, poonam
| author | ysr |
|---|---|
| date | Mon, 16 Aug 2010 15:58:42 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 // An ImmutableSpace is a viewport into a contiguous range | |
| 26 // (or subrange) of previously allocated objects. | |
| 27 | |
| 28 // Invariant: bottom() and end() are on page_size boundaries and | |
| 29 // bottom() <= end() | |
| 30 | |
| 31 class ImmutableSpace: public CHeapObj { | |
| 32 friend class VMStructs; | |
| 33 protected: | |
| 34 HeapWord* _bottom; | |
| 35 HeapWord* _end; | |
| 36 | |
| 37 public: | |
| 38 ImmutableSpace() { _bottom = NULL; _end = NULL; } | |
| 39 HeapWord* bottom() const { return _bottom; } | |
| 40 HeapWord* end() const { return _end; } | |
| 41 | |
| 42 MemRegion region() const { return MemRegion(bottom(), end()); } | |
| 43 | |
| 44 // Initialization | |
| 45 void initialize(MemRegion mr); | |
| 46 | |
| 47 bool contains(const void* p) const { return _bottom <= p && p < _end; } | |
| 48 | |
| 49 // Size computations. Sizes are in bytes. | |
| 50 size_t capacity_in_bytes() const { return capacity_in_words() * HeapWordSize; } | |
| 51 | |
| 52 // Size computations. Sizes are in heapwords. | |
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6740923: NUMA allocator: Ensure the progress of adaptive chunk resizing
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53 size_t capacity_in_words() const { return pointer_delta(end(), bottom()); } |
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6740923: NUMA allocator: Ensure the progress of adaptive chunk resizing
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54 virtual size_t capacity_in_words(Thread*) const { return capacity_in_words(); } |
| 0 | 55 |
| 56 // Iteration. | |
| 57 virtual void oop_iterate(OopClosure* cl); | |
| 58 virtual void object_iterate(ObjectClosure* cl); | |
| 59 | |
| 60 // Debugging | |
| 61 virtual void print() const PRODUCT_RETURN; | |
| 62 virtual void print_short() const PRODUCT_RETURN; | |
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6711930: NUMA allocator: ParOld can create a hole less than minimal object size in the lgrp chunk
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63 virtual void verify(bool allow_dirty); |
| 0 | 64 }; |