Mercurial > hg > truffle
annotate src/share/vm/memory/modRefBarrierSet.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 063382f9b575 |
| children | 63a4eb8bcd23 3205e78d8193 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2012, 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 | |
| 1972 | 25 #ifndef SHARE_VM_MEMORY_MODREFBARRIERSET_HPP |
| 26 #define SHARE_VM_MEMORY_MODREFBARRIERSET_HPP | |
| 27 | |
| 28 #include "memory/barrierSet.hpp" | |
| 29 | |
| 0 | 30 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and |
| 31 // enumerate ref fields that have been modified (since the last | |
| 32 // enumeration), using a card table. | |
| 33 | |
| 34 class OopClosure; | |
| 35 class Generation; | |
| 36 | |
| 37 class ModRefBarrierSet: public BarrierSet { | |
| 38 public: | |
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39 |
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40 ModRefBarrierSet() { _kind = BarrierSet::ModRef; } |
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41 |
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42 bool is_a(BarrierSet::Name bsn) { |
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43 return bsn == BarrierSet::ModRef; |
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44 } |
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45 |
| 0 | 46 // Barriers only on ref writes. |
| 47 bool has_read_ref_barrier() { return false; } | |
| 48 bool has_read_prim_barrier() { return false; } | |
| 49 bool has_write_ref_barrier() { return true; } | |
| 50 bool has_write_prim_barrier() { return false; } | |
| 51 | |
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52 bool read_ref_needs_barrier(void* field) { return false; } |
| 0 | 53 bool read_prim_needs_barrier(HeapWord* field, size_t bytes) { return false; } |
| 54 bool write_prim_needs_barrier(HeapWord* field, size_t bytes, | |
| 55 juint val1, juint val2) { return false; } | |
| 56 | |
| 57 void write_prim_field(oop obj, size_t offset, size_t bytes, | |
| 58 juint val1, juint val2) {} | |
| 59 | |
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60 void read_ref_field(void* field) {} |
| 0 | 61 void read_prim_field(HeapWord* field, size_t bytes) {} |
| 62 protected: | |
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63 virtual void write_ref_field_work(void* field, oop new_val) = 0; |
| 0 | 64 public: |
| 65 void write_prim_field(HeapWord* field, size_t bytes, | |
| 66 juint val1, juint val2) {} | |
| 67 | |
| 68 bool has_read_ref_array_opt() { return false; } | |
| 69 bool has_read_prim_array_opt() { return false; } | |
| 70 bool has_write_prim_array_opt() { return false; } | |
| 71 | |
| 72 bool has_read_region_opt() { return false; } | |
| 73 | |
| 74 | |
| 75 // These operations should assert false unless the correponding operation | |
| 76 // above returns true. | |
| 77 void read_ref_array(MemRegion mr) { | |
| 78 assert(false, "can't call"); | |
| 79 } | |
| 80 void read_prim_array(MemRegion mr) { | |
| 81 assert(false, "can't call"); | |
| 82 } | |
| 83 void write_prim_array(MemRegion mr) { | |
| 84 assert(false, "can't call"); | |
| 85 } | |
| 86 void read_region(MemRegion mr) { | |
| 87 assert(false, "can't call"); | |
| 88 } | |
| 89 | |
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90 // Causes all refs in "mr" to be assumed to be modified. If "whole_heap" |
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91 // is true, the caller asserts that the entire heap is being invalidated, |
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92 // which may admit an optimized implementation for some barriers. |
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93 virtual void invalidate(MemRegion mr, bool whole_heap = false) = 0; |
| 0 | 94 |
| 95 // The caller guarantees that "mr" contains no references. (Perhaps it's | |
| 96 // objects have been moved elsewhere.) | |
| 97 virtual void clear(MemRegion mr) = 0; | |
| 98 | |
| 99 // Pass along the argument to the superclass. | |
| 100 ModRefBarrierSet(int max_covered_regions) : | |
| 101 BarrierSet(max_covered_regions) {} | |
| 102 }; | |
| 1972 | 103 |
| 104 #endif // SHARE_VM_MEMORY_MODREFBARRIERSET_HPP |