Mercurial > hg > truffle
annotate src/share/vm/code/oopRecorder.cpp @ 14517:3812c088b945
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author | lana |
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date | Thu, 06 Mar 2014 10:37:26 -0800 |
parents | da91efe96a93 |
children | 9928ad27a80e |
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0 | 1 /* |
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2 * Copyright (c) 1998, 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 #include "precompiled.hpp" |
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26 #include "ci/ciEnv.hpp" |
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27 #include "ci/ciInstance.hpp" |
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28 #include "ci/ciMetadata.hpp" |
1972 | 29 #include "code/oopRecorder.hpp" |
30 #include "memory/allocation.inline.hpp" | |
31 #include "oops/oop.inline.hpp" | |
0 | 32 |
33 #ifdef ASSERT | |
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34 template <class T> int ValueRecorder<T>::_find_index_calls = 0; |
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35 template <class T> int ValueRecorder<T>::_hit_indexes = 0; |
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36 template <class T> int ValueRecorder<T>::_missed_indexes = 0; |
0 | 37 #endif //ASSERT |
38 | |
39 | |
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40 template <class T> ValueRecorder<T>::ValueRecorder(Arena* arena) { |
0 | 41 _handles = NULL; |
42 _indexes = NULL; | |
43 _arena = arena; | |
44 _complete = false; | |
45 } | |
46 | |
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47 template <class T> template <class X> ValueRecorder<T>::IndexCache<X>::IndexCache() { |
0 | 48 assert(first_index > 0, "initial zero state of cache must be invalid index"); |
49 Copy::zero_to_bytes(&_cache[0], sizeof(_cache)); | |
50 } | |
51 | |
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52 template <class T> int ValueRecorder<T>::size() { |
0 | 53 _complete = true; |
54 if (_handles == NULL) return 0; | |
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55 return _handles->length() * sizeof(T); |
0 | 56 } |
57 | |
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58 template <class T> void ValueRecorder<T>::copy_values_to(nmethod* nm) { |
0 | 59 assert(_complete, "must be frozen"); |
60 maybe_initialize(); // get non-null handles, even if we have no oops | |
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61 nm->copy_values(_handles); |
0 | 62 } |
63 | |
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64 template <class T> void ValueRecorder<T>::maybe_initialize() { |
0 | 65 if (_handles == NULL) { |
66 if (_arena != NULL) { | |
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67 _handles = new(_arena) GrowableArray<T>(_arena, 10, 0, 0); |
0 | 68 _no_finds = new(_arena) GrowableArray<int>( _arena, 10, 0, 0); |
69 } else { | |
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70 _handles = new GrowableArray<T>(10, 0, 0); |
0 | 71 _no_finds = new GrowableArray<int>( 10, 0, 0); |
72 } | |
73 } | |
74 } | |
75 | |
76 | |
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77 template <class T> T ValueRecorder<T>::at(int index) { |
0 | 78 // there is always a NULL virtually present as first object |
79 if (index == null_index) return NULL; | |
80 return _handles->at(index - first_index); | |
81 } | |
82 | |
83 | |
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84 template <class T> int ValueRecorder<T>::add_handle(T h, bool make_findable) { |
0 | 85 assert(!_complete, "cannot allocate more elements after size query"); |
86 maybe_initialize(); | |
87 // indexing uses 1 as an origin--0 means null | |
88 int index = _handles->length() + first_index; | |
89 _handles->append(h); | |
90 | |
91 // Support correct operation of find_index(). | |
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92 assert(!(make_findable && !is_real(h)), "nulls are not findable"); |
0 | 93 if (make_findable) { |
94 // This index may be returned from find_index(). | |
95 if (_indexes != NULL) { | |
96 int* cloc = _indexes->cache_location(h); | |
97 _indexes->set_cache_location_index(cloc, index); | |
98 } else if (index == index_cache_threshold && _arena != NULL) { | |
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99 _indexes = new(_arena) IndexCache<T>(); |
0 | 100 for (int i = 0; i < _handles->length(); i++) { |
101 // Load the cache with pre-existing elements. | |
102 int index0 = i + first_index; | |
103 if (_no_finds->contains(index0)) continue; | |
104 int* cloc = _indexes->cache_location(_handles->at(i)); | |
105 _indexes->set_cache_location_index(cloc, index0); | |
106 } | |
107 } | |
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108 } else if (is_real(h)) { |
0 | 109 // Remember that this index is not to be returned from find_index(). |
110 // This case is rare, because most or all uses of allocate_index pass | |
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111 // an argument of NULL or Universe::non_oop_word. |
0 | 112 // Thus, the expected length of _no_finds is zero. |
113 _no_finds->append(index); | |
114 } | |
115 | |
116 return index; | |
117 } | |
118 | |
119 | |
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120 template <class T> int ValueRecorder<T>::maybe_find_index(T h) { |
0 | 121 debug_only(_find_index_calls++); |
122 assert(!_complete, "cannot allocate more elements after size query"); | |
123 maybe_initialize(); | |
124 if (h == NULL) return null_index; | |
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125 assert(is_real(h), "must be valid"); |
0 | 126 int* cloc = (_indexes == NULL)? NULL: _indexes->cache_location(h); |
127 if (cloc != NULL) { | |
128 int cindex = _indexes->cache_location_index(cloc); | |
129 if (cindex == 0) { | |
130 return -1; // We know this handle is completely new. | |
131 } | |
132 if (cindex >= first_index && _handles->at(cindex - first_index) == h) { | |
133 debug_only(_hit_indexes++); | |
134 return cindex; | |
135 } | |
136 if (!_indexes->cache_location_collision(cloc)) { | |
137 return -1; // We know the current cache occupant is unique to that cloc. | |
138 } | |
139 } | |
140 | |
141 // Not found in cache, due to a cache collision. (Or, no cache at all.) | |
142 // Do a linear search, most recent to oldest. | |
143 for (int i = _handles->length() - 1; i >= 0; i--) { | |
144 if (_handles->at(i) == h) { | |
145 int findex = i + first_index; | |
146 if (_no_finds->contains(findex)) continue; // oops; skip this one | |
147 if (cloc != NULL) { | |
148 _indexes->set_cache_location_index(cloc, findex); | |
149 } | |
150 debug_only(_missed_indexes++); | |
151 return findex; | |
152 } | |
153 } | |
154 return -1; | |
155 } | |
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156 |
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157 // Explicitly instantiate these types |
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158 template class ValueRecorder<Metadata*>; |
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159 template class ValueRecorder<jobject>; |