Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1ParScanThreadState.inline.hpp @ 20257:7426d8d76305
8034761: Remove the do_code_roots parameter from process_strong_roots
Reviewed-by: tschatzl, mgerdin, jmasa
author | stefank |
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date | Thu, 13 Feb 2014 17:44:39 +0100 |
parents | a2328cbebb23 |
children | a3953c777565 |
rev | line source |
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20223 | 1 /* |
2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. | |
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 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_INLINE_HPP | |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_INLINE_HPP | |
27 | |
28 #include "gc_implementation/g1/g1ParScanThreadState.hpp" | |
29 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
30 #include "oops/oop.inline.hpp" | |
31 | |
32 template <class T> inline void G1ParScanThreadState::immediate_rs_update(HeapRegion* from, T* p, int tid) { | |
33 if (!from->is_survivor()) { | |
34 _g1_rem->par_write_ref(from, p, tid); | |
35 } | |
36 } | |
37 | |
38 template <class T> void G1ParScanThreadState::update_rs(HeapRegion* from, T* p, int tid) { | |
39 if (G1DeferredRSUpdate) { | |
40 deferred_rs_update(from, p, tid); | |
41 } else { | |
42 immediate_rs_update(from, p, tid); | |
43 } | |
44 } | |
45 | |
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46 template <class T> void G1ParScanThreadState::do_oop_evac(T* p, HeapRegion* from) { |
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47 assert(!oopDesc::is_null(oopDesc::load_decode_heap_oop(p)), |
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48 "Reference should not be NULL here as such are never pushed to the task queue."); |
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49 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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50 |
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51 // Although we never intentionally push references outside of the collection |
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52 // set, due to (benign) races in the claim mechanism during RSet scanning more |
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53 // than one thread might claim the same card. So the same card may be |
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54 // processed multiple times. So redo this check. |
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55 if (_g1h->in_cset_fast_test(obj)) { |
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56 oop forwardee; |
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57 if (obj->is_forwarded()) { |
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58 forwardee = obj->forwardee(); |
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59 } else { |
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60 forwardee = copy_to_survivor_space(obj); |
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61 } |
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62 assert(forwardee != NULL, "forwardee should not be NULL"); |
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63 oopDesc::encode_store_heap_oop(p, forwardee); |
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64 } |
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65 |
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66 assert(obj != NULL, "Must be"); |
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67 update_rs(from, p, queue_num()); |
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68 } |
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69 |
20223 | 70 inline void G1ParScanThreadState::do_oop_partial_array(oop* p) { |
71 assert(has_partial_array_mask(p), "invariant"); | |
72 oop from_obj = clear_partial_array_mask(p); | |
73 | |
74 assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap."); | |
75 assert(from_obj->is_objArray(), "must be obj array"); | |
76 objArrayOop from_obj_array = objArrayOop(from_obj); | |
77 // The from-space object contains the real length. | |
78 int length = from_obj_array->length(); | |
79 | |
80 assert(from_obj->is_forwarded(), "must be forwarded"); | |
81 oop to_obj = from_obj->forwardee(); | |
82 assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); | |
83 objArrayOop to_obj_array = objArrayOop(to_obj); | |
84 // We keep track of the next start index in the length field of the | |
85 // to-space object. | |
86 int next_index = to_obj_array->length(); | |
87 assert(0 <= next_index && next_index < length, | |
88 err_msg("invariant, next index: %d, length: %d", next_index, length)); | |
89 | |
90 int start = next_index; | |
91 int end = length; | |
92 int remainder = end - start; | |
93 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. | |
94 if (remainder > 2 * ParGCArrayScanChunk) { | |
95 end = start + ParGCArrayScanChunk; | |
96 to_obj_array->set_length(end); | |
97 // Push the remainder before we process the range in case another | |
98 // worker has run out of things to do and can steal it. | |
99 oop* from_obj_p = set_partial_array_mask(from_obj); | |
100 push_on_queue(from_obj_p); | |
101 } else { | |
102 assert(length == end, "sanity"); | |
103 // We'll process the final range for this object. Restore the length | |
104 // so that the heap remains parsable in case of evacuation failure. | |
105 to_obj_array->set_length(end); | |
106 } | |
107 _scanner.set_region(_g1h->heap_region_containing_raw(to_obj)); | |
108 // Process indexes [start,end). It will also process the header | |
109 // along with the first chunk (i.e., the chunk with start == 0). | |
110 // Note that at this point the length field of to_obj_array is not | |
111 // correct given that we are using it to keep track of the next | |
112 // start index. oop_iterate_range() (thankfully!) ignores the length | |
113 // field and only relies on the start / end parameters. It does | |
114 // however return the size of the object which will be incorrect. So | |
115 // we have to ignore it even if we wanted to use it. | |
116 to_obj_array->oop_iterate_range(&_scanner, start, end); | |
117 } | |
118 | |
119 template <class T> inline void G1ParScanThreadState::deal_with_reference(T* ref_to_scan) { | |
120 if (!has_partial_array_mask(ref_to_scan)) { | |
121 // Note: we can use "raw" versions of "region_containing" because | |
122 // "obj_to_scan" is definitely in the heap, and is not in a | |
123 // humongous region. | |
124 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); | |
125 do_oop_evac(ref_to_scan, r); | |
126 } else { | |
127 do_oop_partial_array((oop*)ref_to_scan); | |
128 } | |
129 } | |
130 | |
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131 inline void G1ParScanThreadState::dispatch_reference(StarTask ref) { |
20223 | 132 assert(verify_task(ref), "sanity"); |
133 if (ref.is_narrow()) { | |
134 deal_with_reference((narrowOop*)ref); | |
135 } else { | |
136 deal_with_reference((oop*)ref); | |
137 } | |
138 } | |
139 | |
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140 void G1ParScanThreadState::steal_and_trim_queue(RefToScanQueueSet *task_queues) { |
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141 StarTask stolen_task; |
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142 while (task_queues->steal(queue_num(), hash_seed(), stolen_task)) { |
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143 assert(verify_task(stolen_task), "sanity"); |
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144 dispatch_reference(stolen_task); |
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145 |
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146 // We've just processed a reference and we might have made |
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147 // available new entries on the queues. So we have to make sure |
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148 // we drain the queues as necessary. |
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149 trim_queue(); |
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150 } |
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151 } |
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152 |
20223 | 153 #endif /* SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_INLINE_HPP */ |
154 |