Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionSeq.inline.hpp @ 6615:09aad8452938
7190310: Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops
Summary: In C2 add software membar after load from Reference.referent field to prevent commoning of loads across safepoint since GC can change its value. In C1 always generate Reference.get() intrinsic.
Reviewed-by: roland, twisti, dholmes, johnc
author | kvn |
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date | Mon, 20 Aug 2012 09:58:58 -0700 |
parents | 720b6a76dd9d |
children | a19bea467577 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP | |
27 | |
3766 | 28 #include "gc_implementation/g1/heapRegion.hpp" |
1972 | 29 #include "gc_implementation/g1/heapRegionSeq.hpp" |
30 | |
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31 inline uintx HeapRegionSeq::addr_to_index_biased(HeapWord* addr) const { |
3766 | 32 assert(_heap_bottom <= addr && addr < _heap_end, |
33 err_msg("addr: "PTR_FORMAT" bottom: "PTR_FORMAT" end: "PTR_FORMAT, | |
34 addr, _heap_bottom, _heap_end)); | |
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35 uintx index = (uintx) addr >> _region_shift; |
3766 | 36 return index; |
37 } | |
38 | |
39 inline HeapRegion* HeapRegionSeq::addr_to_region_unsafe(HeapWord* addr) const { | |
40 assert(_heap_bottom <= addr && addr < _heap_end, | |
41 err_msg("addr: "PTR_FORMAT" bottom: "PTR_FORMAT" end: "PTR_FORMAT, | |
42 addr, _heap_bottom, _heap_end)); | |
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43 uintx index_biased = addr_to_index_biased(addr); |
3766 | 44 HeapRegion* hr = _regions_biased[index_biased]; |
45 assert(hr != NULL, "invariant"); | |
46 return hr; | |
47 } | |
48 | |
49 inline HeapRegion* HeapRegionSeq::addr_to_region(HeapWord* addr) const { | |
50 if (addr != NULL && addr < _heap_end) { | |
51 assert(addr >= _heap_bottom, | |
52 err_msg("addr: "PTR_FORMAT" bottom: "PTR_FORMAT, addr, _heap_bottom)); | |
53 return addr_to_region_unsafe(addr); | |
342 | 54 } |
55 return NULL; | |
56 } | |
1972 | 57 |
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58 inline HeapRegion* HeapRegionSeq::at(uint index) const { |
3766 | 59 assert(index < length(), "pre-condition"); |
60 HeapRegion* hr = _regions[index]; | |
61 assert(hr != NULL, "sanity"); | |
62 assert(hr->hrs_index() == index, "sanity"); | |
63 return hr; | |
64 } | |
65 | |
1972 | 66 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP |