Mercurial > hg > truffle
annotate src/share/vm/oops/klassKlass.cpp @ 5274:e72dd6533eb9
documented importance of nmethod::_graal_compiled_method wrt code unloading and GC
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 23 Apr 2012 15:42:30 +0200 |
parents | fdd9dd4508fa |
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rev | line source |
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0 | 1 /* |
2227 | 2 * Copyright (c) 1997, 2011, 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" |
26 #include "gc_implementation/shared/markSweep.inline.hpp" | |
27 #include "gc_interface/collectedHeap.hpp" | |
28 #include "gc_interface/collectedHeap.inline.hpp" | |
29 #include "memory/oopFactory.hpp" | |
30 #include "memory/permGen.hpp" | |
31 #include "oops/constantPoolKlass.hpp" | |
32 #include "oops/instanceKlass.hpp" | |
33 #include "oops/instanceOop.hpp" | |
34 #include "oops/klassKlass.hpp" | |
35 #include "oops/klassOop.hpp" | |
36 #include "oops/methodKlass.hpp" | |
37 #include "oops/objArrayKlass.hpp" | |
38 #include "oops/oop.inline.hpp" | |
39 #include "oops/oop.inline2.hpp" | |
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40 #include "oops/symbol.hpp" |
1972 | 41 #include "oops/typeArrayKlass.hpp" |
42 #include "runtime/handles.inline.hpp" | |
43 #ifndef SERIALGC | |
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44 #include "gc_implementation/parNew/parOopClosures.inline.hpp" |
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45 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" |
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46 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" |
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47 #include "memory/cardTableRS.hpp" |
1972 | 48 #include "oops/oop.pcgc.inline.hpp" |
49 #endif | |
0 | 50 |
51 int klassKlass::oop_size(oop obj) const { | |
52 assert (obj->is_klass(), "must be a klassOop"); | |
53 return klassOop(obj)->klass_part()->klass_oop_size(); | |
54 } | |
55 | |
56 klassOop klassKlass::create_klass(TRAPS) { | |
57 KlassHandle h_this_klass; | |
58 klassKlass o; | |
59 // for bootstrapping, handles may not be available yet. | |
60 klassOop k = base_create_klass_oop(h_this_klass, header_size(), o.vtbl_value(), CHECK_NULL); | |
61 k->set_klass(k); // point to thyself | |
62 // Do not try to allocate mirror, java.lang.Class not loaded at this point. | |
63 // See Universe::fixup_mirrors() | |
64 return k; | |
65 } | |
66 | |
67 void klassKlass::oop_follow_contents(oop obj) { | |
68 Klass* k = Klass::cast(klassOop(obj)); | |
69 // If we are alive it is valid to keep our superclass and subtype caches alive | |
70 MarkSweep::mark_and_push(k->adr_super()); | |
71 for (juint i = 0; i < Klass::primary_super_limit(); i++) | |
72 MarkSweep::mark_and_push(k->adr_primary_supers()+i); | |
73 MarkSweep::mark_and_push(k->adr_secondary_super_cache()); | |
74 MarkSweep::mark_and_push(k->adr_secondary_supers()); | |
75 MarkSweep::mark_and_push(k->adr_java_mirror()); | |
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76 #ifdef GRAAL |
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77 MarkSweep::mark_and_push(k->adr_graal_mirror()); |
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78 #endif |
0 | 79 // We follow the subklass and sibling links at the end of the |
80 // marking phase, since otherwise following them will prevent | |
81 // class unloading (all classes are transitively linked from | |
82 // java.lang.Object). | |
83 MarkSweep::revisit_weak_klass_link(k); | |
84 obj->follow_header(); | |
85 } | |
86 | |
87 #ifndef SERIALGC | |
88 void klassKlass::oop_follow_contents(ParCompactionManager* cm, | |
89 oop obj) { | |
90 Klass* k = Klass::cast(klassOop(obj)); | |
91 // If we are alive it is valid to keep our superclass and subtype caches alive | |
92 PSParallelCompact::mark_and_push(cm, k->adr_super()); | |
93 for (juint i = 0; i < Klass::primary_super_limit(); i++) | |
94 PSParallelCompact::mark_and_push(cm, k->adr_primary_supers()+i); | |
95 PSParallelCompact::mark_and_push(cm, k->adr_secondary_super_cache()); | |
96 PSParallelCompact::mark_and_push(cm, k->adr_secondary_supers()); | |
97 PSParallelCompact::mark_and_push(cm, k->adr_java_mirror()); | |
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98 #ifdef GRAAL |
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99 PSParallelCompact::mark_and_push(cm, k->adr_graal_mirror()); |
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100 #endif |
0 | 101 // We follow the subklass and sibling links at the end of the |
102 // marking phase, since otherwise following them will prevent | |
103 // class unloading (all classes are transitively linked from | |
104 // java.lang.Object). | |
105 PSParallelCompact::revisit_weak_klass_link(cm, k); | |
106 obj->follow_header(cm); | |
107 } | |
108 #endif // SERIALGC | |
109 | |
110 int klassKlass::oop_oop_iterate(oop obj, OopClosure* blk) { | |
111 // Get size before changing pointers | |
112 int size = oop_size(obj); | |
113 Klass* k = Klass::cast(klassOop(obj)); | |
114 blk->do_oop(k->adr_super()); | |
115 for (juint i = 0; i < Klass::primary_super_limit(); i++) | |
116 blk->do_oop(k->adr_primary_supers()+i); | |
117 blk->do_oop(k->adr_secondary_super_cache()); | |
118 blk->do_oop(k->adr_secondary_supers()); | |
119 blk->do_oop(k->adr_java_mirror()); | |
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120 #ifdef GRAAL |
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121 blk->do_oop(k->adr_graal_mirror()); |
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122 #endif |
0 | 123 // The following are in the perm gen and are treated |
124 // specially in a later phase of a perm gen collection; ... | |
125 assert(oop(k)->is_perm(), "should be in perm"); | |
126 assert(oop(k->subklass())->is_perm_or_null(), "should be in perm"); | |
127 assert(oop(k->next_sibling())->is_perm_or_null(), "should be in perm"); | |
128 // ... don't scan them normally, but remember this klassKlass | |
129 // for later (see, for instance, oop_follow_contents above | |
130 // for what MarkSweep does with it. | |
131 if (blk->should_remember_klasses()) { | |
132 blk->remember_klass(k); | |
133 } | |
134 obj->oop_iterate_header(blk); | |
135 return size; | |
136 } | |
137 | |
138 | |
139 int klassKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { | |
140 // Get size before changing pointers | |
141 int size = oop_size(obj); | |
142 Klass* k = Klass::cast(klassOop(obj)); | |
143 oop* adr; | |
144 adr = k->adr_super(); | |
145 if (mr.contains(adr)) blk->do_oop(adr); | |
146 for (juint i = 0; i < Klass::primary_super_limit(); i++) { | |
147 adr = k->adr_primary_supers()+i; | |
148 if (mr.contains(adr)) blk->do_oop(adr); | |
149 } | |
150 adr = k->adr_secondary_super_cache(); | |
151 if (mr.contains(adr)) blk->do_oop(adr); | |
152 adr = k->adr_secondary_supers(); | |
153 if (mr.contains(adr)) blk->do_oop(adr); | |
154 adr = k->adr_java_mirror(); | |
155 if (mr.contains(adr)) blk->do_oop(adr); | |
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156 #ifdef GRAAL |
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157 adr = k->adr_graal_mirror(); |
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158 if (mr.contains(adr)) blk->do_oop(adr); |
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159 #endif |
0 | 160 // The following are "weak links" in the perm gen and are |
161 // treated specially in a later phase of a perm gen collection. | |
162 assert(oop(k)->is_perm(), "should be in perm"); | |
163 assert(oop(k->adr_subklass())->is_perm(), "should be in perm"); | |
164 assert(oop(k->adr_next_sibling())->is_perm(), "should be in perm"); | |
165 if (blk->should_remember_klasses() | |
166 && (mr.contains(k->adr_subklass()) | |
167 || mr.contains(k->adr_next_sibling()))) { | |
168 blk->remember_klass(k); | |
169 } | |
170 obj->oop_iterate_header(blk, mr); | |
171 return size; | |
172 } | |
173 | |
174 | |
175 int klassKlass::oop_adjust_pointers(oop obj) { | |
176 // Get size before changing pointers | |
177 int size = oop_size(obj); | |
178 obj->adjust_header(); | |
179 | |
180 Klass* k = Klass::cast(klassOop(obj)); | |
181 | |
182 MarkSweep::adjust_pointer(k->adr_super()); | |
183 for (juint i = 0; i < Klass::primary_super_limit(); i++) | |
184 MarkSweep::adjust_pointer(k->adr_primary_supers()+i); | |
185 MarkSweep::adjust_pointer(k->adr_secondary_super_cache()); | |
186 MarkSweep::adjust_pointer(k->adr_secondary_supers()); | |
187 MarkSweep::adjust_pointer(k->adr_java_mirror()); | |
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188 #ifdef GRAAL |
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189 MarkSweep::adjust_pointer(k->adr_graal_mirror()); |
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190 #endif |
0 | 191 MarkSweep::adjust_pointer(k->adr_subklass()); |
192 MarkSweep::adjust_pointer(k->adr_next_sibling()); | |
193 return size; | |
194 } | |
195 | |
196 #ifndef SERIALGC | |
197 void klassKlass::oop_push_contents(PSPromotionManager* pm, oop obj) { | |
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198 Klass* k = Klass::cast(klassOop(obj)); |
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199 |
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200 oop* p = k->adr_java_mirror(); |
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201 if (PSScavenge::should_scavenge(p)) { |
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202 pm->claim_or_forward_depth(p); |
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203 } |
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204 |
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205 p = k->adr_graal_mirror(); |
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206 if (PSScavenge::should_scavenge(p)) { |
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207 pm->claim_or_forward_depth(p); |
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208 } |
0 | 209 } |
210 | |
211 int klassKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) { | |
212 Klass* k = Klass::cast(klassOop(obj)); | |
213 | |
214 oop* const beg_oop = k->oop_block_beg(); | |
215 oop* const end_oop = k->oop_block_end(); | |
216 for (oop* cur_oop = beg_oop; cur_oop < end_oop; ++cur_oop) { | |
217 PSParallelCompact::adjust_pointer(cur_oop); | |
218 } | |
219 | |
220 return oop_size(obj); | |
221 } | |
222 #endif // SERIALGC | |
223 | |
224 | |
225 // Printing | |
226 | |
227 void klassKlass::oop_print_on(oop obj, outputStream* st) { | |
228 Klass::oop_print_on(obj, st); | |
229 } | |
230 | |
231 void klassKlass::oop_print_value_on(oop obj, outputStream* st) { | |
232 Klass::oop_print_value_on(obj, st); | |
233 } | |
234 | |
235 const char* klassKlass::internal_name() const { | |
236 return "{other class}"; | |
237 } | |
238 | |
239 | |
240 // Verification | |
241 | |
242 void klassKlass::oop_verify_on(oop obj, outputStream* st) { | |
243 Klass::oop_verify_on(obj, st); | |
244 guarantee(obj->is_perm(), "should be in permspace"); | |
245 guarantee(obj->is_klass(), "should be klass"); | |
246 | |
247 Klass* k = Klass::cast(klassOop(obj)); | |
248 if (k->super() != NULL) { | |
249 guarantee(k->super()->is_perm(), "should be in permspace"); | |
250 guarantee(k->super()->is_klass(), "should be klass"); | |
251 } | |
252 klassOop ko = k->secondary_super_cache(); | |
253 if( ko != NULL ) { | |
254 guarantee(ko->is_perm(), "should be in permspace"); | |
255 guarantee(ko->is_klass(), "should be klass"); | |
256 } | |
257 for( uint i = 0; i < primary_super_limit(); i++ ) { | |
258 oop ko = k->adr_primary_supers()[i]; // Cannot use normal accessor because it asserts | |
259 if( ko != NULL ) { | |
260 guarantee(ko->is_perm(), "should be in permspace"); | |
261 guarantee(ko->is_klass(), "should be klass"); | |
262 } | |
263 } | |
264 | |
265 if (k->java_mirror() != NULL || (k->oop_is_instance() && instanceKlass::cast(klassOop(obj))->is_loaded())) { | |
266 guarantee(k->java_mirror() != NULL, "should be allocated"); | |
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267 guarantee(k->java_mirror()->is_perm() || !JavaObjectsInPerm, "should be in permspace"); |
0 | 268 guarantee(k->java_mirror()->is_instance(), "should be instance"); |
269 } | |
270 } |