Mercurial > hg > truffle
annotate src/share/vm/memory/universe.cpp @ 7182:c24f778e9401
Merge
author | johnc |
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date | Thu, 29 Nov 2012 11:23:15 -0800 |
parents | 59c790074993 f34d701e952e |
children | 5fafdef522c6 |
rev | line source |
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0 | 1 /* |
6008 | 2 * Copyright (c) 1997, 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" |
26 #include "classfile/classLoader.hpp" | |
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27 #include "classfile/classLoaderData.hpp" |
1972 | 28 #include "classfile/javaClasses.hpp" |
29 #include "classfile/symbolTable.hpp" | |
30 #include "classfile/systemDictionary.hpp" | |
31 #include "classfile/vmSymbols.hpp" | |
32 #include "code/codeCache.hpp" | |
33 #include "code/dependencies.hpp" | |
34 #include "gc_interface/collectedHeap.inline.hpp" | |
35 #include "interpreter/interpreter.hpp" | |
36 #include "memory/cardTableModRefBS.hpp" | |
37 #include "memory/gcLocker.inline.hpp" | |
38 #include "memory/genCollectedHeap.hpp" | |
39 #include "memory/genRemSet.hpp" | |
40 #include "memory/generation.hpp" | |
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41 #include "memory/metadataFactory.hpp" |
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42 #include "memory/metaspaceShared.hpp" |
1972 | 43 #include "memory/oopFactory.hpp" |
44 #include "memory/space.hpp" | |
45 #include "memory/universe.hpp" | |
46 #include "memory/universe.inline.hpp" | |
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47 #include "oops/constantPool.hpp" |
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48 #include "oops/instanceClassLoaderKlass.hpp" |
1972 | 49 #include "oops/instanceKlass.hpp" |
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50 #include "oops/instanceMirrorKlass.hpp" |
1972 | 51 #include "oops/instanceRefKlass.hpp" |
52 #include "oops/oop.inline.hpp" | |
53 #include "oops/typeArrayKlass.hpp" | |
54 #include "prims/jvmtiRedefineClassesTrace.hpp" | |
55 #include "runtime/aprofiler.hpp" | |
56 #include "runtime/arguments.hpp" | |
57 #include "runtime/deoptimization.hpp" | |
58 #include "runtime/fprofiler.hpp" | |
59 #include "runtime/handles.inline.hpp" | |
60 #include "runtime/init.hpp" | |
61 #include "runtime/java.hpp" | |
62 #include "runtime/javaCalls.hpp" | |
63 #include "runtime/sharedRuntime.hpp" | |
64 #include "runtime/synchronizer.hpp" | |
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65 #include "runtime/thread.inline.hpp" |
1972 | 66 #include "runtime/timer.hpp" |
67 #include "runtime/vm_operations.hpp" | |
68 #include "services/memoryService.hpp" | |
69 #include "utilities/copy.hpp" | |
70 #include "utilities/events.hpp" | |
71 #include "utilities/hashtable.inline.hpp" | |
72 #include "utilities/preserveException.hpp" | |
73 #ifndef SERIALGC | |
74 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" | |
75 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp" | |
76 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
77 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
78 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
79 #endif | |
0 | 80 |
81 // Known objects | |
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82 Klass* Universe::_boolArrayKlassObj = NULL; |
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83 Klass* Universe::_byteArrayKlassObj = NULL; |
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84 Klass* Universe::_charArrayKlassObj = NULL; |
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85 Klass* Universe::_intArrayKlassObj = NULL; |
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86 Klass* Universe::_shortArrayKlassObj = NULL; |
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87 Klass* Universe::_longArrayKlassObj = NULL; |
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88 Klass* Universe::_singleArrayKlassObj = NULL; |
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89 Klass* Universe::_doubleArrayKlassObj = NULL; |
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90 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; |
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91 Klass* Universe::_objectArrayKlassObj = NULL; |
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92 oop Universe::_int_mirror = NULL; |
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93 oop Universe::_float_mirror = NULL; |
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94 oop Universe::_double_mirror = NULL; |
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95 oop Universe::_byte_mirror = NULL; |
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96 oop Universe::_bool_mirror = NULL; |
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97 oop Universe::_char_mirror = NULL; |
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98 oop Universe::_long_mirror = NULL; |
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99 oop Universe::_short_mirror = NULL; |
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100 oop Universe::_void_mirror = NULL; |
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101 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; |
0 | 102 oop Universe::_main_thread_group = NULL; |
103 oop Universe::_system_thread_group = NULL; | |
104 objArrayOop Universe::_the_empty_class_klass_array = NULL; | |
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105 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; |
1080
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106 oop Universe::_the_null_string = NULL; |
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107 oop Universe::_the_min_jint_string = NULL; |
0 | 108 LatestMethodOopCache* Universe::_finalizer_register_cache = NULL; |
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109 LatestMethodOopCache* Universe::_loader_addClass_cache = NULL; |
0 | 110 ActiveMethodOopsCache* Universe::_reflect_invoke_cache = NULL; |
111 oop Universe::_out_of_memory_error_java_heap = NULL; | |
112 oop Universe::_out_of_memory_error_perm_gen = NULL; | |
113 oop Universe::_out_of_memory_error_array_size = NULL; | |
114 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; | |
115 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; | |
116 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; | |
117 bool Universe::_verify_in_progress = false; | |
118 oop Universe::_null_ptr_exception_instance = NULL; | |
119 oop Universe::_arithmetic_exception_instance = NULL; | |
120 oop Universe::_virtual_machine_error_instance = NULL; | |
121 oop Universe::_vm_exception = NULL; | |
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122 Array<int>* Universe::_the_empty_int_array = NULL; |
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123 Array<u2>* Universe::_the_empty_short_array = NULL; |
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124 Array<Klass*>* Universe::_the_empty_klass_array = NULL; |
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125 Array<Method*>* Universe::_the_empty_method_array = NULL; |
0 | 126 |
127 // These variables are guarded by FullGCALot_lock. | |
128 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) | |
129 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) | |
130 | |
131 // Heap | |
132 int Universe::_verify_count = 0; | |
133 | |
134 int Universe::_base_vtable_size = 0; | |
135 bool Universe::_bootstrapping = false; | |
136 bool Universe::_fully_initialized = false; | |
137 | |
138 size_t Universe::_heap_capacity_at_last_gc; | |
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139 size_t Universe::_heap_used_at_last_gc = 0; |
0 | 140 |
141 CollectedHeap* Universe::_collectedHeap = NULL; | |
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142 |
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143 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; |
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144 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; |
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145 address Universe::_narrow_ptrs_base; |
0 | 146 |
147 | |
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148 void Universe::basic_type_classes_do(void f(Klass*)) { |
0 | 149 f(boolArrayKlassObj()); |
150 f(byteArrayKlassObj()); | |
151 f(charArrayKlassObj()); | |
152 f(intArrayKlassObj()); | |
153 f(shortArrayKlassObj()); | |
154 f(longArrayKlassObj()); | |
155 f(singleArrayKlassObj()); | |
156 f(doubleArrayKlassObj()); | |
157 } | |
158 | |
159 void Universe::oops_do(OopClosure* f, bool do_all) { | |
160 | |
161 f->do_oop((oop*) &_int_mirror); | |
162 f->do_oop((oop*) &_float_mirror); | |
163 f->do_oop((oop*) &_double_mirror); | |
164 f->do_oop((oop*) &_byte_mirror); | |
165 f->do_oop((oop*) &_bool_mirror); | |
166 f->do_oop((oop*) &_char_mirror); | |
167 f->do_oop((oop*) &_long_mirror); | |
168 f->do_oop((oop*) &_short_mirror); | |
169 f->do_oop((oop*) &_void_mirror); | |
170 | |
171 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
172 f->do_oop((oop*) &_mirrors[i]); | |
173 } | |
174 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); | |
175 | |
176 f->do_oop((oop*)&_the_empty_class_klass_array); | |
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177 f->do_oop((oop*)&_the_null_string); |
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178 f->do_oop((oop*)&_the_min_jint_string); |
0 | 179 f->do_oop((oop*)&_out_of_memory_error_java_heap); |
180 f->do_oop((oop*)&_out_of_memory_error_perm_gen); | |
181 f->do_oop((oop*)&_out_of_memory_error_array_size); | |
182 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); | |
183 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); | |
184 f->do_oop((oop*)&_null_ptr_exception_instance); | |
185 f->do_oop((oop*)&_arithmetic_exception_instance); | |
186 f->do_oop((oop*)&_virtual_machine_error_instance); | |
187 f->do_oop((oop*)&_main_thread_group); | |
188 f->do_oop((oop*)&_system_thread_group); | |
189 f->do_oop((oop*)&_vm_exception); | |
190 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) | |
191 } | |
192 | |
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193 // Serialize metadata in and out of CDS archive, not oops. |
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194 void Universe::serialize(SerializeClosure* f, bool do_all) { |
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195 |
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196 f->do_ptr((void**)&_boolArrayKlassObj); |
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197 f->do_ptr((void**)&_byteArrayKlassObj); |
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198 f->do_ptr((void**)&_charArrayKlassObj); |
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199 f->do_ptr((void**)&_intArrayKlassObj); |
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200 f->do_ptr((void**)&_shortArrayKlassObj); |
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201 f->do_ptr((void**)&_longArrayKlassObj); |
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202 f->do_ptr((void**)&_singleArrayKlassObj); |
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203 f->do_ptr((void**)&_doubleArrayKlassObj); |
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204 f->do_ptr((void**)&_objectArrayKlassObj); |
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205 |
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206 { |
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207 for (int i = 0; i < T_VOID+1; i++) { |
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208 if (_typeArrayKlassObjs[i] != NULL) { |
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209 assert(i >= T_BOOLEAN, "checking"); |
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210 f->do_ptr((void**)&_typeArrayKlassObjs[i]); |
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211 } else if (do_all) { |
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212 f->do_ptr((void**)&_typeArrayKlassObjs[i]); |
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213 } |
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214 } |
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215 } |
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216 |
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217 f->do_ptr((void**)&_the_array_interfaces_array); |
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218 f->do_ptr((void**)&_the_empty_int_array); |
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219 f->do_ptr((void**)&_the_empty_short_array); |
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220 f->do_ptr((void**)&_the_empty_method_array); |
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221 f->do_ptr((void**)&_the_empty_klass_array); |
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222 _finalizer_register_cache->serialize(f); |
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223 _loader_addClass_cache->serialize(f); |
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224 _reflect_invoke_cache->serialize(f); |
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225 } |
0 | 226 |
227 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { | |
228 if (size < alignment || size % alignment != 0) { | |
229 ResourceMark rm; | |
230 stringStream st; | |
231 st.print("Size of %s (%ld bytes) must be aligned to %ld bytes", name, size, alignment); | |
232 char* error = st.as_string(); | |
233 vm_exit_during_initialization(error); | |
234 } | |
235 } | |
236 | |
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237 void initialize_basic_type_klass(Klass* k, TRAPS) { |
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238 Klass* ok = SystemDictionary::Object_klass(); |
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239 if (UseSharedSpaces) { |
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240 assert(k->super() == ok, "u3"); |
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241 k->restore_unshareable_info(CHECK); |
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242 } else { |
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243 k->initialize_supers(ok, CHECK); |
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244 } |
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245 k->append_to_sibling_list(); |
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246 } |
0 | 247 |
248 void Universe::genesis(TRAPS) { | |
249 ResourceMark rm; | |
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250 |
0 | 251 { FlagSetting fs(_bootstrapping, true); |
252 | |
253 { MutexLocker mc(Compile_lock); | |
254 | |
255 // determine base vtable size; without that we cannot create the array klasses | |
256 compute_base_vtable_size(); | |
257 | |
258 if (!UseSharedSpaces) { | |
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259 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); |
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260 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); |
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261 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); |
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262 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); |
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263 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); |
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264 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); |
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265 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); |
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266 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); |
0 | 267 |
268 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; | |
269 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; | |
270 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; | |
271 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; | |
272 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; | |
273 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; | |
274 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; | |
275 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; | |
276 | |
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277 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); |
0 | 278 |
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279 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); |
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280 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); |
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281 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); |
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282 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); |
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283 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); |
0 | 284 } |
285 } | |
286 | |
287 vmSymbols::initialize(CHECK); | |
288 | |
289 SystemDictionary::initialize(CHECK); | |
290 | |
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291 Klass* ok = SystemDictionary::Object_klass(); |
0 | 292 |
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293 _the_null_string = StringTable::intern("null", CHECK); |
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294 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); |
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295 |
0 | 296 if (UseSharedSpaces) { |
297 // Verify shared interfaces array. | |
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298 assert(_the_array_interfaces_array->at(0) == |
1142 | 299 SystemDictionary::Cloneable_klass(), "u3"); |
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300 assert(_the_array_interfaces_array->at(1) == |
1142 | 301 SystemDictionary::Serializable_klass(), "u3"); |
0 | 302 } else { |
303 // Set up shared interfaces array. (Do this before supers are set up.) | |
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304 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); |
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305 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); |
0 | 306 } |
307 | |
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308 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); |
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309 initialize_basic_type_klass(charArrayKlassObj(), CHECK); |
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310 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); |
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311 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); |
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312 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); |
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313 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); |
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314 initialize_basic_type_klass(intArrayKlassObj(), CHECK); |
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315 initialize_basic_type_klass(longArrayKlassObj(), CHECK); |
0 | 316 } // end of core bootstrapping |
317 | |
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318 // Maybe this could be lifted up now that object array can be initialized |
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319 // during the bootstrapping. |
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320 |
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321 // OLD |
0 | 322 // Initialize _objectArrayKlass after core bootstraping to make |
323 // sure the super class is set up properly for _objectArrayKlass. | |
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324 // --- |
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325 // NEW |
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326 // Since some of the old system object arrays have been converted to |
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327 // ordinary object arrays, _objectArrayKlass will be loaded when |
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328 // SystemDictionary::initialize(CHECK); is run. See the extra check |
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329 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. |
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330 _objectArrayKlassObj = InstanceKlass:: |
1142 | 331 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); |
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332 // OLD |
0 | 333 // Add the class to the class hierarchy manually to make sure that |
334 // its vtable is initialized after core bootstrapping is completed. | |
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335 // --- |
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336 // New |
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337 // Have already been initialized. |
6983 | 338 _objectArrayKlassObj->append_to_sibling_list(); |
0 | 339 |
340 // Compute is_jdk version flags. | |
341 // Only 1.3 or later has the java.lang.Shutdown class. | |
342 // Only 1.4 or later has the java.lang.CharSequence interface. | |
343 // Only 1.5 or later has the java.lang.management.MemoryUsage class. | |
242 | 344 if (JDK_Version::is_partially_initialized()) { |
345 uint8_t jdk_version; | |
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346 Klass* k = SystemDictionary::resolve_or_null( |
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347 vmSymbols::java_lang_management_MemoryUsage(), THREAD); |
0 | 348 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
349 if (k == NULL) { | |
242 | 350 k = SystemDictionary::resolve_or_null( |
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351 vmSymbols::java_lang_CharSequence(), THREAD); |
0 | 352 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
353 if (k == NULL) { | |
242 | 354 k = SystemDictionary::resolve_or_null( |
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355 vmSymbols::java_lang_Shutdown(), THREAD); |
0 | 356 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
357 if (k == NULL) { | |
242 | 358 jdk_version = 2; |
0 | 359 } else { |
242 | 360 jdk_version = 3; |
0 | 361 } |
362 } else { | |
242 | 363 jdk_version = 4; |
0 | 364 } |
365 } else { | |
242 | 366 jdk_version = 5; |
0 | 367 } |
242 | 368 JDK_Version::fully_initialize(jdk_version); |
0 | 369 } |
370 | |
371 #ifdef ASSERT | |
372 if (FullGCALot) { | |
373 // Allocate an array of dummy objects. | |
374 // We'd like these to be at the bottom of the old generation, | |
375 // so that when we free one and then collect, | |
376 // (almost) the whole heap moves | |
377 // and we find out if we actually update all the oops correctly. | |
378 // But we can't allocate directly in the old generation, | |
379 // so we allocate wherever, and hope that the first collection | |
380 // moves these objects to the bottom of the old generation. | |
381 // We can allocate directly in the permanent generation, so we do. | |
382 int size; | |
383 if (UseConcMarkSweepGC) { | |
384 warning("Using +FullGCALot with concurrent mark sweep gc " | |
385 "will not force all objects to relocate"); | |
386 size = FullGCALotDummies; | |
387 } else { | |
388 size = FullGCALotDummies * 2; | |
389 } | |
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390 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); |
0 | 391 objArrayHandle dummy_array(THREAD, naked_array); |
392 int i = 0; | |
393 while (i < size) { | |
394 // Allocate dummy in old generation | |
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395 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); |
0 | 396 dummy_array->obj_at_put(i++, dummy); |
397 } | |
398 { | |
399 // Only modify the global variable inside the mutex. | |
400 // If we had a race to here, the other dummy_array instances | |
401 // and their elements just get dropped on the floor, which is fine. | |
402 MutexLocker ml(FullGCALot_lock); | |
403 if (_fullgc_alot_dummy_array == NULL) { | |
404 _fullgc_alot_dummy_array = dummy_array(); | |
405 } | |
406 } | |
407 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); | |
408 } | |
409 #endif | |
410 } | |
411 | |
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412 // CDS support for patching vtables in metadata in the shared archive. |
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413 // All types inherited from Metadata have vtables, but not types inherited |
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414 // from MetaspaceObj, because the latter does not have virtual functions. |
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415 // If the metadata type has a vtable, it cannot be shared in the read-only |
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416 // section of the CDS archive, because the vtable pointer is patched. |
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417 static inline void add_vtable(void** list, int* n, void* o, int count) { |
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418 guarantee((*n) < count, "vtable list too small"); |
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419 void* vtable = dereference_vptr(o); |
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420 assert(*(void**)(vtable) != NULL, "invalid vtable"); |
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421 list[(*n)++] = vtable; |
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422 } |
0 | 423 |
424 void Universe::init_self_patching_vtbl_list(void** list, int count) { | |
425 int n = 0; | |
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426 { InstanceKlass o; add_vtable(list, &n, &o, count); } |
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427 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } |
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428 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } |
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429 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } |
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430 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } |
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431 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } |
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432 { Method o; add_vtable(list, &n, &o, count); } |
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433 { ConstantPool o; add_vtable(list, &n, &o, count); } |
0 | 434 } |
435 | |
436 void Universe::initialize_basic_type_mirrors(TRAPS) { | |
437 assert(_int_mirror==NULL, "basic type mirrors already initialized"); | |
438 _int_mirror = | |
439 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); | |
440 _float_mirror = | |
441 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); | |
442 _double_mirror = | |
443 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); | |
444 _byte_mirror = | |
445 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); | |
446 _bool_mirror = | |
447 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); | |
448 _char_mirror = | |
449 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); | |
450 _long_mirror = | |
451 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); | |
452 _short_mirror = | |
453 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); | |
454 _void_mirror = | |
455 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); | |
456 | |
457 _mirrors[T_INT] = _int_mirror; | |
458 _mirrors[T_FLOAT] = _float_mirror; | |
459 _mirrors[T_DOUBLE] = _double_mirror; | |
460 _mirrors[T_BYTE] = _byte_mirror; | |
461 _mirrors[T_BOOLEAN] = _bool_mirror; | |
462 _mirrors[T_CHAR] = _char_mirror; | |
463 _mirrors[T_LONG] = _long_mirror; | |
464 _mirrors[T_SHORT] = _short_mirror; | |
465 _mirrors[T_VOID] = _void_mirror; | |
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466 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); |
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467 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); |
0 | 468 } |
469 | |
470 void Universe::fixup_mirrors(TRAPS) { | |
471 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, | |
472 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply | |
473 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note | |
474 // that the number of objects allocated at this point is very small. | |
1142 | 475 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); |
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476 HandleMark hm(THREAD); |
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477 // Cache the start of the static fields |
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478 InstanceMirrorKlass::init_offset_of_static_fields(); |
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479 |
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480 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); |
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481 int list_length = list->length(); |
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482 for (int i = 0; i < list_length; i++) { |
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483 Klass* k = list->at(i); |
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484 assert(k->is_klass(), "List should only hold classes"); |
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485 EXCEPTION_MARK; |
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486 KlassHandle kh(THREAD, k); |
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487 java_lang_Class::fixup_mirror(kh, CATCH); |
0 | 488 } |
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489 delete java_lang_Class::fixup_mirror_list(); |
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490 java_lang_Class::set_fixup_mirror_list(NULL); |
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491 } |
0 | 492 |
493 static bool has_run_finalizers_on_exit = false; | |
494 | |
495 void Universe::run_finalizers_on_exit() { | |
496 if (has_run_finalizers_on_exit) return; | |
497 has_run_finalizers_on_exit = true; | |
498 | |
499 // Called on VM exit. This ought to be run in a separate thread. | |
500 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); | |
501 { | |
502 PRESERVE_EXCEPTION_MARK; | |
1142 | 503 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); |
0 | 504 JavaValue result(T_VOID); |
505 JavaCalls::call_static( | |
506 &result, | |
507 finalizer_klass, | |
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508 vmSymbols::run_finalizers_on_exit_name(), |
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509 vmSymbols::void_method_signature(), |
0 | 510 THREAD |
511 ); | |
512 // Ignore any pending exceptions | |
513 CLEAR_PENDING_EXCEPTION; | |
514 } | |
515 } | |
516 | |
517 | |
518 // initialize_vtable could cause gc if | |
519 // 1) we specified true to initialize_vtable and | |
520 // 2) this ran after gc was enabled | |
521 // In case those ever change we use handles for oops | |
522 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { | |
523 // init vtable of k and all subclasses | |
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524 Klass* ko = k_h(); |
0 | 525 klassVtable* vt = ko->vtable(); |
526 if (vt) vt->initialize_vtable(false, CHECK); | |
527 if (ko->oop_is_instance()) { | |
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528 InstanceKlass* ik = (InstanceKlass*)ko; |
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529 for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->next_sibling())) { |
0 | 530 reinitialize_vtable_of(s_h, CHECK); |
531 } | |
532 } | |
533 } | |
534 | |
535 | |
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536 void initialize_itable_for_klass(Klass* k, TRAPS) { |
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537 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); |
0 | 538 } |
539 | |
540 | |
541 void Universe::reinitialize_itables(TRAPS) { | |
542 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); | |
543 | |
544 } | |
545 | |
546 | |
547 bool Universe::on_page_boundary(void* addr) { | |
548 return ((uintptr_t) addr) % os::vm_page_size() == 0; | |
549 } | |
550 | |
551 | |
552 bool Universe::should_fill_in_stack_trace(Handle throwable) { | |
553 // never attempt to fill in the stack trace of preallocated errors that do not have | |
554 // backtrace. These errors are kept alive forever and may be "re-used" when all | |
555 // preallocated errors with backtrace have been consumed. Also need to avoid | |
556 // a potential loop which could happen if an out of memory occurs when attempting | |
557 // to allocate the backtrace. | |
558 return ((throwable() != Universe::_out_of_memory_error_java_heap) && | |
559 (throwable() != Universe::_out_of_memory_error_perm_gen) && | |
560 (throwable() != Universe::_out_of_memory_error_array_size) && | |
561 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); | |
562 } | |
563 | |
564 | |
565 oop Universe::gen_out_of_memory_error(oop default_err) { | |
566 // generate an out of memory error: | |
567 // - if there is a preallocated error with backtrace available then return it wth | |
568 // a filled in stack trace. | |
569 // - if there are no preallocated errors with backtrace available then return | |
570 // an error without backtrace. | |
571 int next; | |
572 if (_preallocated_out_of_memory_error_avail_count > 0) { | |
573 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); | |
574 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); | |
575 } else { | |
576 next = -1; | |
577 } | |
578 if (next < 0) { | |
579 // all preallocated errors have been used. | |
580 // return default | |
581 return default_err; | |
582 } else { | |
583 // get the error object at the slot and set set it to NULL so that the | |
584 // array isn't keeping it alive anymore. | |
585 oop exc = preallocated_out_of_memory_errors()->obj_at(next); | |
586 assert(exc != NULL, "slot has been used already"); | |
587 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); | |
588 | |
589 // use the message from the default error | |
590 oop msg = java_lang_Throwable::message(default_err); | |
591 assert(msg != NULL, "no message"); | |
592 java_lang_Throwable::set_message(exc, msg); | |
593 | |
594 // populate the stack trace and return it. | |
595 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); | |
596 return exc; | |
597 } | |
598 } | |
599 | |
600 static intptr_t non_oop_bits = 0; | |
601 | |
602 void* Universe::non_oop_word() { | |
603 // Neither the high bits nor the low bits of this value is allowed | |
604 // to look like (respectively) the high or low bits of a real oop. | |
605 // | |
606 // High and low are CPU-specific notions, but low always includes | |
607 // the low-order bit. Since oops are always aligned at least mod 4, | |
608 // setting the low-order bit will ensure that the low half of the | |
609 // word will never look like that of a real oop. | |
610 // | |
611 // Using the OS-supplied non-memory-address word (usually 0 or -1) | |
612 // will take care of the high bits, however many there are. | |
613 | |
614 if (non_oop_bits == 0) { | |
615 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; | |
616 } | |
617 | |
618 return (void*)non_oop_bits; | |
619 } | |
620 | |
621 jint universe_init() { | |
622 assert(!Universe::_fully_initialized, "called after initialize_vtables"); | |
623 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), | |
624 "LogHeapWordSize is incorrect."); | |
625 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); | |
626 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, | |
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627 "oop size is not not a multiple of HeapWord size"); |
0 | 628 TraceTime timer("Genesis", TraceStartupTime); |
629 GC_locker::lock(); // do not allow gc during bootstrapping | |
630 JavaClasses::compute_hard_coded_offsets(); | |
631 | |
632 jint status = Universe::initialize_heap(); | |
633 if (status != JNI_OK) { | |
634 return status; | |
635 } | |
636 | |
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637 // Create memory for metadata. Must be after initializing heap for |
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638 // DumpSharedSpaces. |
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639 ClassLoaderData::init_null_class_loader_data(); |
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640 |
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641 // We have a heap so create the Method* caches before |
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642 // Metaspace::initialize_shared_spaces() tries to populate them. |
0 | 643 Universe::_finalizer_register_cache = new LatestMethodOopCache(); |
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644 Universe::_loader_addClass_cache = new LatestMethodOopCache(); |
0 | 645 Universe::_reflect_invoke_cache = new ActiveMethodOopsCache(); |
646 | |
647 if (UseSharedSpaces) { | |
648 // Read the data structures supporting the shared spaces (shared | |
649 // system dictionary, symbol table, etc.). After that, access to | |
650 // the file (other than the mapped regions) is no longer needed, and | |
651 // the file is closed. Closing the file does not affect the | |
652 // currently mapped regions. | |
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653 MetaspaceShared::initialize_shared_spaces(); |
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654 StringTable::create_table(); |
0 | 655 } else { |
656 SymbolTable::create_table(); | |
657 StringTable::create_table(); | |
658 ClassLoader::create_package_info_table(); | |
659 } | |
660 | |
661 return JNI_OK; | |
662 } | |
663 | |
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664 // Choose the heap base address and oop encoding mode |
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665 // when compressed oops are used: |
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666 // Unscaled - Use 32-bits oops without encoding when |
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667 // NarrowOopHeapBaseMin + heap_size < 4Gb |
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668 // ZeroBased - Use zero based compressed oops with encoding when |
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669 // NarrowOopHeapBaseMin + heap_size < 32Gb |
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670 // HeapBased - Use compressed oops with heap base + encoding. |
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671 |
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672 // 4Gb |
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673 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); |
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674 // 32Gb |
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675 // OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes; |
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676 |
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677 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) { |
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678 size_t base = 0; |
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679 #ifdef _LP64 |
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680 if (UseCompressedOops) { |
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681 assert(mode == UnscaledNarrowOop || |
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682 mode == ZeroBasedNarrowOop || |
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683 mode == HeapBasedNarrowOop, "mode is invalid"); |
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684 const size_t total_size = heap_size + HeapBaseMinAddress; |
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685 // Return specified base for the first request. |
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686 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { |
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687 base = HeapBaseMinAddress; |
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688 } else if (total_size <= OopEncodingHeapMax && (mode != HeapBasedNarrowOop)) { |
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689 if (total_size <= NarrowOopHeapMax && (mode == UnscaledNarrowOop) && |
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690 (Universe::narrow_oop_shift() == 0)) { |
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691 // Use 32-bits oops without encoding and |
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692 // place heap's top on the 4Gb boundary |
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693 base = (NarrowOopHeapMax - heap_size); |
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694 } else { |
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695 // Can't reserve with NarrowOopShift == 0 |
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696 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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697 if (mode == UnscaledNarrowOop || |
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698 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { |
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699 // Use zero based compressed oops with encoding and |
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700 // place heap's top on the 32Gb boundary in case |
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701 // total_size > 4Gb or failed to reserve below 4Gb. |
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702 base = (OopEncodingHeapMax - heap_size); |
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703 } |
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704 } |
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705 } else { |
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706 // Can't reserve below 32Gb. |
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707 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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708 } |
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709 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks |
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710 // used in ReservedHeapSpace() constructors. |
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711 // The final values will be set in initialize_heap() below. |
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712 if (base != 0 && (base + heap_size) <= OopEncodingHeapMax) { |
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713 // Use zero based compressed oops |
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714 Universe::set_narrow_oop_base(NULL); |
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715 // Don't need guard page for implicit checks in indexed |
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716 // addressing mode with zero based Compressed Oops. |
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717 Universe::set_narrow_oop_use_implicit_null_checks(true); |
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718 } else { |
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719 // Set to a non-NULL value so the ReservedSpace ctor computes |
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720 // the correct no-access prefix. |
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721 // The final value will be set in initialize_heap() below. |
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722 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); |
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723 #ifdef _WIN64 |
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724 if (UseLargePages) { |
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725 // Cannot allocate guard pages for implicit checks in indexed |
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726 // addressing mode when large pages are specified on windows. |
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727 Universe::set_narrow_oop_use_implicit_null_checks(false); |
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728 } |
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729 #endif // _WIN64 |
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730 } |
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731 } |
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732 #endif |
1057
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733 return (char*)base; // also return NULL (don't care) for 32-bit VM |
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734 } |
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735 |
0 | 736 jint Universe::initialize_heap() { |
737 | |
738 if (UseParallelGC) { | |
739 #ifndef SERIALGC | |
740 Universe::_collectedHeap = new ParallelScavengeHeap(); | |
741 #else // SERIALGC | |
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742 fatal("UseParallelGC not supported in this VM."); |
0 | 743 #endif // SERIALGC |
744 | |
342
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745 } else if (UseG1GC) { |
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746 #ifndef SERIALGC |
4013 | 747 G1CollectorPolicy* g1p = new G1CollectorPolicy(); |
342
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748 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); |
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749 Universe::_collectedHeap = g1h; |
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750 #else // SERIALGC |
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751 fatal("UseG1GC not supported in java kernel vm."); |
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752 #endif // SERIALGC |
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753 |
0 | 754 } else { |
755 GenCollectorPolicy *gc_policy; | |
756 | |
757 if (UseSerialGC) { | |
758 gc_policy = new MarkSweepPolicy(); | |
759 } else if (UseConcMarkSweepGC) { | |
760 #ifndef SERIALGC | |
761 if (UseAdaptiveSizePolicy) { | |
762 gc_policy = new ASConcurrentMarkSweepPolicy(); | |
763 } else { | |
764 gc_policy = new ConcurrentMarkSweepPolicy(); | |
765 } | |
766 #else // SERIALGC | |
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767 fatal("UseConcMarkSweepGC not supported in this VM."); |
0 | 768 #endif // SERIALGC |
769 } else { // default old generation | |
770 gc_policy = new MarkSweepPolicy(); | |
771 } | |
772 | |
773 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); | |
774 } | |
775 | |
776 jint status = Universe::heap()->initialize(); | |
777 if (status != JNI_OK) { | |
778 return status; | |
779 } | |
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780 |
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781 #ifdef _LP64 |
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782 if (UseCompressedOops) { |
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783 // Subtract a page because something can get allocated at heap base. |
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784 // This also makes implicit null checking work, because the |
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785 // memory+1 page below heap_base needs to cause a signal. |
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786 // See needs_explicit_null_check. |
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787 // Only set the heap base for compressed oops because it indicates |
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788 // compressed oops for pstack code. |
2080 | 789 bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose); |
790 if (verbose) { | |
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791 tty->cr(); |
1963 | 792 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", |
793 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); | |
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794 } |
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795 if ((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax) { |
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796 // Can't reserve heap below 32Gb. |
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797 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap() |
642
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798 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
2080 | 799 if (verbose) { |
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800 tty->print(", Compressed Oops with base: "PTR_FORMAT, Universe::narrow_oop_base()); |
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801 } |
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802 } else { |
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803 Universe::set_narrow_oop_base(0); |
2080 | 804 if (verbose) { |
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805 tty->print(", zero based Compressed Oops"); |
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806 } |
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807 #ifdef _WIN64 |
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808 if (!Universe::narrow_oop_use_implicit_null_checks()) { |
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809 // Don't need guard page for implicit checks in indexed addressing |
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810 // mode with zero based Compressed Oops. |
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811 Universe::set_narrow_oop_use_implicit_null_checks(true); |
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812 } |
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813 #endif // _WIN64 |
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814 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { |
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815 // Can't reserve heap below 4Gb. |
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816 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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817 } else { |
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818 Universe::set_narrow_oop_shift(0); |
2080 | 819 if (verbose) { |
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820 tty->print(", 32-bits Oops"); |
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821 } |
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822 } |
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823 } |
2080 | 824 if (verbose) { |
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825 tty->cr(); |
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826 tty->cr(); |
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827 } |
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828 if (UseCompressedKlassPointers) { |
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829 Universe::set_narrow_klass_base(Universe::narrow_oop_base()); |
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830 Universe::set_narrow_klass_shift(MIN2(Universe::narrow_oop_shift(), LogKlassAlignmentInBytes)); |
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831 } |
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832 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); |
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833 } |
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834 // Universe::narrow_oop_base() is one page below the metaspace |
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835 // base. The actual metaspace base depends on alignment constraints |
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836 // so we don't know its exact location here. |
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837 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - os::vm_page_size() - ClassMetaspaceSize) || |
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838 Universe::narrow_oop_base() == NULL, "invalid value"); |
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839 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || |
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840 Universe::narrow_oop_shift() == 0, "invalid value"); |
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841 #endif |
0 | 842 |
843 // We will never reach the CATCH below since Exceptions::_throw will cause | |
844 // the VM to exit if an exception is thrown during initialization | |
845 | |
846 if (UseTLAB) { | |
847 assert(Universe::heap()->supports_tlab_allocation(), | |
848 "Should support thread-local allocation buffers"); | |
849 ThreadLocalAllocBuffer::startup_initialization(); | |
850 } | |
851 return JNI_OK; | |
852 } | |
853 | |
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854 |
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855 // Reserve the Java heap, which is now the same for all GCs. |
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856 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { |
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857 // Add in the class metaspace area so the classes in the headers can |
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858 // be compressed the same as instances. |
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859 // Need to round class space size up because it's below the heap and |
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860 // the actual alignment depends on its size. |
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861 size_t metaspace_size = align_size_up(ClassMetaspaceSize, alignment); |
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862 size_t total_reserved = align_size_up(heap_size + metaspace_size, alignment); |
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863 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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864 |
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865 ReservedHeapSpace total_rs(total_reserved, alignment, UseLargePages, addr); |
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866 |
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867 if (UseCompressedOops) { |
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868 if (addr != NULL && !total_rs.is_reserved()) { |
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869 // Failed to reserve at specified address - the requested memory |
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870 // region is taken already, for example, by 'java' launcher. |
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871 // Try again to reserver heap higher. |
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872 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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873 |
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874 ReservedHeapSpace total_rs0(total_reserved, alignment, |
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875 UseLargePages, addr); |
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876 |
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877 if (addr != NULL && !total_rs0.is_reserved()) { |
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878 // Failed to reserve at specified address again - give up. |
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879 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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880 assert(addr == NULL, ""); |
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881 |
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882 ReservedHeapSpace total_rs1(total_reserved, alignment, |
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883 UseLargePages, addr); |
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884 total_rs = total_rs1; |
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885 } else { |
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886 total_rs = total_rs0; |
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887 } |
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888 } |
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889 } |
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890 |
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891 if (!total_rs.is_reserved()) { |
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892 vm_exit_during_initialization(err_msg("Could not reserve enough space for object heap %d bytes", total_reserved)); |
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893 return total_rs; |
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894 } |
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895 |
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896 // Split the reserved space into main Java heap and a space for |
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897 // classes so that they can be compressed using the same algorithm |
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898 // as compressed oops. If compress oops and compress klass ptrs are |
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899 // used we need the meta space first: if the alignment used for |
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900 // compressed oops is greater than the one used for compressed klass |
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901 // ptrs, a metadata space on top of the heap could become |
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902 // unreachable. |
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903 ReservedSpace class_rs = total_rs.first_part(metaspace_size); |
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904 ReservedSpace heap_rs = total_rs.last_part(metaspace_size, alignment); |
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905 Metaspace::initialize_class_space(class_rs); |
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906 |
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907 if (UseCompressedOops) { |
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908 // Universe::initialize_heap() will reset this to NULL if unscaled |
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909 // or zero-based narrow oops are actually used. |
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910 address base = (address)(total_rs.base() - os::vm_page_size()); |
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911 Universe::set_narrow_oop_base(base); |
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912 } |
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913 return heap_rs; |
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914 } |
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915 |
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916 |
0 | 917 // It's the caller's repsonsibility to ensure glitch-freedom |
918 // (if required). | |
919 void Universe::update_heap_info_at_gc() { | |
920 _heap_capacity_at_last_gc = heap()->capacity(); | |
921 _heap_used_at_last_gc = heap()->used(); | |
922 } | |
923 | |
924 | |
925 | |
926 void universe2_init() { | |
927 EXCEPTION_MARK; | |
928 Universe::genesis(CATCH); | |
929 // Although we'd like to verify here that the state of the heap | |
930 // is good, we can't because the main thread has not yet added | |
931 // itself to the threads list (so, using current interfaces | |
932 // we can't "fill" its TLAB), unless TLABs are disabled. | |
933 if (VerifyBeforeGC && !UseTLAB && | |
934 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
935 Universe::heap()->prepare_for_verify(); | |
936 Universe::verify(); // make sure we're starting with a clean slate | |
937 } | |
938 } | |
939 | |
940 | |
941 // This function is defined in JVM.cpp | |
942 extern void initialize_converter_functions(); | |
943 | |
944 bool universe_post_init() { | |
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945 assert(!is_init_completed(), "Error: initialization not yet completed!"); |
0 | 946 Universe::_fully_initialized = true; |
947 EXCEPTION_MARK; | |
948 { ResourceMark rm; | |
949 Interpreter::initialize(); // needed for interpreter entry points | |
950 if (!UseSharedSpaces) { | |
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951 HandleMark hm(THREAD); |
1142 | 952 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); |
0 | 953 Universe::reinitialize_vtable_of(ok_h, CHECK_false); |
954 Universe::reinitialize_itables(CHECK_false); | |
955 } | |
956 } | |
957 | |
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958 HandleMark hm(THREAD); |
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959 Klass* k; |
0 | 960 instanceKlassHandle k_h; |
961 // Setup preallocated empty java.lang.Class array | |
1142 | 962 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); |
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963 |
0 | 964 // Setup preallocated OutOfMemoryError errors |
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965 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); |
0 | 966 k_h = instanceKlassHandle(THREAD, k); |
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967 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); |
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968 Universe::_out_of_memory_error_perm_gen = k_h->allocate_instance(CHECK_false); |
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969 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); |
0 | 970 Universe::_out_of_memory_error_gc_overhead_limit = |
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971 k_h->allocate_instance(CHECK_false); |
0 | 972 |
973 // Setup preallocated NullPointerException | |
974 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
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975 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); |
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976 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
0 | 977 // Setup preallocated ArithmeticException |
978 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
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979 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); |
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980 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
0 | 981 // Virtual Machine Error for when we get into a situation we can't resolve |
982 k = SystemDictionary::resolve_or_fail( | |
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983 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); |
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984 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); |
0 | 985 if (!linked) { |
986 tty->print_cr("Unable to link/verify VirtualMachineError class"); | |
987 return false; // initialization failed | |
988 } | |
989 Universe::_virtual_machine_error_instance = | |
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990 InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
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991 |
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992 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
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993 |
0 | 994 if (!DumpSharedSpaces) { |
995 // These are the only Java fields that are currently set during shared space dumping. | |
996 // We prefer to not handle this generally, so we always reinitialize these detail messages. | |
997 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); | |
998 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); | |
999 | |
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1000 msg = java_lang_String::create_from_str("Metadata space", CHECK_false); |
0 | 1001 java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg()); |
1002 | |
1003 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); | |
1004 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); | |
1005 | |
1006 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); | |
1007 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); | |
1008 | |
1009 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); | |
1010 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); | |
1011 | |
1012 // Setup the array of errors that have preallocated backtrace | |
1013 k = Universe::_out_of_memory_error_java_heap->klass(); | |
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1014 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); |
0 | 1015 k_h = instanceKlassHandle(THREAD, k); |
1016 | |
1017 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; | |
1018 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); | |
1019 for (int i=0; i<len; i++) { | |
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1020 oop err = k_h->allocate_instance(CHECK_false); |
0 | 1021 Handle err_h = Handle(THREAD, err); |
1022 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); | |
1023 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); | |
1024 } | |
1025 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; | |
1026 } | |
1027 | |
1028 | |
1029 // Setup static method for registering finalizers | |
1030 // The finalizer klass must be linked before looking up the method, in | |
1031 // case it needs to get rewritten. | |
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1032 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); |
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1033 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( |
0 | 1034 vmSymbols::register_method_name(), |
1035 vmSymbols::register_method_signature()); | |
1036 if (m == NULL || !m->is_static()) { | |
1037 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
1038 "java.lang.ref.Finalizer.register", false); | |
1039 } | |
1040 Universe::_finalizer_register_cache->init( | |
1142 | 1041 SystemDictionary::Finalizer_klass(), m, CHECK_false); |
0 | 1042 |
1043 // Resolve on first use and initialize class. | |
1044 // Note: No race-condition here, since a resolve will always return the same result | |
1045 | |
1046 // Setup method for security checks | |
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1047 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_reflect_Method(), true, CHECK_false); |
0 | 1048 k_h = instanceKlassHandle(THREAD, k); |
1049 k_h->link_class(CHECK_false); | |
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1050 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_object_array_object_signature()); |
0 | 1051 if (m == NULL || m->is_static()) { |
1052 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
1053 "java.lang.reflect.Method.invoke", false); | |
1054 } | |
1055 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false); | |
1056 | |
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1057 // Setup method for registering loaded classes in class loader vector |
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1058 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); |
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1059 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); |
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1060 if (m == NULL || m->is_static()) { |
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1061 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), |
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1062 "java.lang.ClassLoader.addClass", false); |
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1063 } |
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1064 Universe::_loader_addClass_cache->init( |
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1065 SystemDictionary::ClassLoader_klass(), m, CHECK_false); |
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1066 |
0 | 1067 // The folowing is initializing converter functions for serialization in |
1068 // JVM.cpp. If we clean up the StrictMath code above we may want to find | |
1069 // a better solution for this as well. | |
1070 initialize_converter_functions(); | |
1071 | |
1072 // This needs to be done before the first scavenge/gc, since | |
1073 // it's an input to soft ref clearing policy. | |
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1074 { |
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1075 MutexLocker x(Heap_lock); |
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1076 Universe::update_heap_info_at_gc(); |
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1077 } |
0 | 1078 |
1079 // ("weak") refs processing infrastructure initialization | |
1080 Universe::heap()->post_initialize(); | |
1081 | |
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1082 // Initialize performance counters for metaspaces |
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1083 MetaspaceCounters::initialize_performance_counters(); |
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1084 |
0 | 1085 GC_locker::unlock(); // allow gc after bootstrapping |
1086 | |
1087 MemoryService::set_universe_heap(Universe::_collectedHeap); | |
1088 return true; | |
1089 } | |
1090 | |
1091 | |
1092 void Universe::compute_base_vtable_size() { | |
1093 _base_vtable_size = ClassLoader::compute_Object_vtable(); | |
1094 } | |
1095 | |
1096 | |
1097 // %%% The Universe::flush_foo methods belong in CodeCache. | |
1098 | |
1099 // Flushes compiled methods dependent on dependee. | |
1100 void Universe::flush_dependents_on(instanceKlassHandle dependee) { | |
1101 assert_lock_strong(Compile_lock); | |
1102 | |
1103 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
1104 | |
1105 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1106 // stopped dring the safepoint so CodeCache will be safe to update without | |
1107 // holding the CodeCache_lock. | |
1108 | |
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1109 KlassDepChange changes(dependee); |
0 | 1110 |
1111 // Compute the dependent nmethods | |
1112 if (CodeCache::mark_for_deoptimization(changes) > 0) { | |
1113 // At least one nmethod has been marked for deoptimization | |
1114 VM_Deoptimize op; | |
1115 VMThread::execute(&op); | |
1116 } | |
1117 } | |
1118 | |
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1119 // Flushes compiled methods dependent on a particular CallSite |
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1120 // instance when its target is different than the given MethodHandle. |
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1121 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) { |
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1122 assert_lock_strong(Compile_lock); |
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1123 |
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1124 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; |
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1125 |
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1126 // CodeCache can only be updated by a thread_in_VM and they will all be |
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1127 // stopped dring the safepoint so CodeCache will be safe to update without |
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1128 // holding the CodeCache_lock. |
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1129 |
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1130 CallSiteDepChange changes(call_site(), method_handle()); |
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1131 |
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1132 // Compute the dependent nmethods that have a reference to a |
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1133 // CallSite object. We use InstanceKlass::mark_dependent_nmethod |
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1134 // directly instead of CodeCache::mark_for_deoptimization because we |
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1135 // want dependents on the call site class only not all classes in |
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1136 // the ContextStream. |
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1137 int marked = 0; |
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1138 { |
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1139 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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1140 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass()); |
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1141 marked = call_site_klass->mark_dependent_nmethods(changes); |
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1142 } |
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1143 if (marked > 0) { |
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1144 // At least one nmethod has been marked for deoptimization |
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1145 VM_Deoptimize op; |
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1146 VMThread::execute(&op); |
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1147 } |
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1148 } |
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1149 |
0 | 1150 #ifdef HOTSWAP |
1151 // Flushes compiled methods dependent on dependee in the evolutionary sense | |
1152 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { | |
1153 // --- Compile_lock is not held. However we are at a safepoint. | |
1154 assert_locked_or_safepoint(Compile_lock); | |
1155 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
1156 | |
1157 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1158 // stopped dring the safepoint so CodeCache will be safe to update without | |
1159 // holding the CodeCache_lock. | |
1160 | |
1161 // Compute the dependent nmethods | |
1162 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { | |
1163 // At least one nmethod has been marked for deoptimization | |
1164 | |
1165 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
1166 // Stuff copied from VM_Deoptimize and modified slightly. | |
1167 | |
1168 // We do not want any GCs to happen while we are in the middle of this VM operation | |
1169 ResourceMark rm; | |
1170 DeoptimizationMarker dm; | |
1171 | |
1172 // Deoptimize all activations depending on marked nmethods | |
1173 Deoptimization::deoptimize_dependents(); | |
1174 | |
1175 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
1176 CodeCache::make_marked_nmethods_not_entrant(); | |
1177 } | |
1178 } | |
1179 #endif // HOTSWAP | |
1180 | |
1181 | |
1182 // Flushes compiled methods dependent on dependee | |
1183 void Universe::flush_dependents_on_method(methodHandle m_h) { | |
1184 // --- Compile_lock is not held. However we are at a safepoint. | |
1185 assert_locked_or_safepoint(Compile_lock); | |
1186 | |
1187 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1188 // stopped dring the safepoint so CodeCache will be safe to update without | |
1189 // holding the CodeCache_lock. | |
1190 | |
1191 // Compute the dependent nmethods | |
1192 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { | |
1193 // At least one nmethod has been marked for deoptimization | |
1194 | |
1195 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
1196 // Stuff copied from VM_Deoptimize and modified slightly. | |
1197 | |
1198 // We do not want any GCs to happen while we are in the middle of this VM operation | |
1199 ResourceMark rm; | |
1200 DeoptimizationMarker dm; | |
1201 | |
1202 // Deoptimize all activations depending on marked nmethods | |
1203 Deoptimization::deoptimize_dependents(); | |
1204 | |
1205 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
1206 CodeCache::make_marked_nmethods_not_entrant(); | |
1207 } | |
1208 } | |
1209 | |
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1210 void Universe::print() { |
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1211 print_on(gclog_or_tty); |
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1212 } |
0 | 1213 |
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1214 void Universe::print_on(outputStream* st, bool extended) { |
0 | 1215 st->print_cr("Heap"); |
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1216 if (!extended) { |
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1217 heap()->print_on(st); |
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1218 } else { |
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1219 heap()->print_extended_on(st); |
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1220 } |
0 | 1221 } |
1222 | |
1223 void Universe::print_heap_at_SIGBREAK() { | |
1224 if (PrintHeapAtSIGBREAK) { | |
1225 MutexLocker hl(Heap_lock); | |
1226 print_on(tty); | |
1227 tty->cr(); | |
1228 tty->flush(); | |
1229 } | |
1230 } | |
1231 | |
4944 | 1232 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { |
0 | 1233 st->print_cr("{Heap before GC invocations=%u (full %u):", |
1234 heap()->total_collections(), | |
1235 heap()->total_full_collections()); | |
4944 | 1236 if (!PrintHeapAtGCExtended || ignore_extended) { |
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1237 heap()->print_on(st); |
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1238 } else { |
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1239 heap()->print_extended_on(st); |
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1240 } |
0 | 1241 } |
1242 | |
4944 | 1243 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { |
0 | 1244 st->print_cr("Heap after GC invocations=%u (full %u):", |
1245 heap()->total_collections(), | |
1246 heap()->total_full_collections()); | |
4944 | 1247 if (!PrintHeapAtGCExtended || ignore_extended) { |
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1248 heap()->print_on(st); |
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1249 } else { |
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1250 heap()->print_extended_on(st); |
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1251 } |
0 | 1252 st->print_cr("}"); |
1253 } | |
1254 | |
6008 | 1255 void Universe::verify(bool silent, VerifyOption option) { |
0 | 1256 // The use of _verify_in_progress is a temporary work around for |
1257 // 6320749. Don't bother with a creating a class to set and clear | |
1258 // it since it is only used in this method and the control flow is | |
1259 // straight forward. | |
1260 _verify_in_progress = true; | |
1261 | |
1262 COMPILER2_PRESENT( | |
1263 assert(!DerivedPointerTable::is_active(), | |
1264 "DPT should not be active during verification " | |
1265 "(of thread stacks below)"); | |
1266 ) | |
1267 | |
1268 ResourceMark rm; | |
1269 HandleMark hm; // Handles created during verification can be zapped | |
1270 _verify_count++; | |
1271 | |
1272 if (!silent) gclog_or_tty->print("[Verifying "); | |
1273 if (!silent) gclog_or_tty->print("threads "); | |
1274 Threads::verify(); | |
6008 | 1275 heap()->verify(silent, option); |
0 | 1276 |
1277 if (!silent) gclog_or_tty->print("syms "); | |
1278 SymbolTable::verify(); | |
1279 if (!silent) gclog_or_tty->print("strs "); | |
1280 StringTable::verify(); | |
1281 { | |
1282 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
1283 if (!silent) gclog_or_tty->print("zone "); | |
1284 CodeCache::verify(); | |
1285 } | |
1286 if (!silent) gclog_or_tty->print("dict "); | |
1287 SystemDictionary::verify(); | |
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1288 #ifndef PRODUCT |
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1289 if (!silent) gclog_or_tty->print("cldg "); |
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1290 ClassLoaderDataGraph::verify(); |
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1291 #endif |
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1292 if (!silent) gclog_or_tty->print("metaspace chunks "); |
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1293 MetaspaceAux::verify_free_chunks(); |
0 | 1294 if (!silent) gclog_or_tty->print("hand "); |
1295 JNIHandles::verify(); | |
1296 if (!silent) gclog_or_tty->print("C-heap "); | |
1297 os::check_heap(); | |
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1298 if (!silent) gclog_or_tty->print("code cache "); |
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1299 CodeCache::verify_oops(); |
0 | 1300 if (!silent) gclog_or_tty->print_cr("]"); |
1301 | |
1302 _verify_in_progress = false; | |
1303 } | |
1304 | |
1305 // Oop verification (see MacroAssembler::verify_oop) | |
1306 | |
1307 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; | |
1308 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; | |
1309 | |
1310 | |
1311 static void calculate_verify_data(uintptr_t verify_data[2], | |
1312 HeapWord* low_boundary, | |
1313 HeapWord* high_boundary) { | |
1314 assert(low_boundary < high_boundary, "bad interval"); | |
1315 | |
1316 // decide which low-order bits we require to be clear: | |
1317 size_t alignSize = MinObjAlignmentInBytes; | |
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1318 size_t min_object_size = CollectedHeap::min_fill_size(); |
0 | 1319 |
1320 // make an inclusive limit: | |
1321 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; | |
1322 uintptr_t min = (uintptr_t)low_boundary; | |
1323 assert(min < max, "bad interval"); | |
1324 uintptr_t diff = max ^ min; | |
1325 | |
1326 // throw away enough low-order bits to make the diff vanish | |
1327 uintptr_t mask = (uintptr_t)(-1); | |
1328 while ((mask & diff) != 0) | |
1329 mask <<= 1; | |
1330 uintptr_t bits = (min & mask); | |
1331 assert(bits == (max & mask), "correct mask"); | |
1332 // check an intermediate value between min and max, just to make sure: | |
1333 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); | |
1334 | |
1335 // require address alignment, too: | |
1336 mask |= (alignSize - 1); | |
1337 | |
1338 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { | |
1339 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); | |
1340 } | |
1341 verify_data[0] = mask; | |
1342 verify_data[1] = bits; | |
1343 } | |
1344 | |
1345 | |
1346 // Oop verification (see MacroAssembler::verify_oop) | |
1347 #ifndef PRODUCT | |
1348 | |
1349 uintptr_t Universe::verify_oop_mask() { | |
1350 MemRegion m = heap()->reserved_region(); | |
1351 calculate_verify_data(_verify_oop_data, | |
1352 m.start(), | |
1353 m.end()); | |
1354 return _verify_oop_data[0]; | |
1355 } | |
1356 | |
1357 | |
1358 | |
1359 uintptr_t Universe::verify_oop_bits() { | |
1360 verify_oop_mask(); | |
1361 return _verify_oop_data[1]; | |
1362 } | |
1363 | |
1364 uintptr_t Universe::verify_mark_mask() { | |
1365 return markOopDesc::lock_mask_in_place; | |
1366 } | |
1367 | |
1368 uintptr_t Universe::verify_mark_bits() { | |
1369 intptr_t mask = verify_mark_mask(); | |
1370 intptr_t bits = (intptr_t)markOopDesc::prototype(); | |
1371 assert((bits & ~mask) == 0, "no stray header bits"); | |
1372 return bits; | |
1373 } | |
1374 #endif // PRODUCT | |
1375 | |
1376 | |
1377 void Universe::compute_verify_oop_data() { | |
1378 verify_oop_mask(); | |
1379 verify_oop_bits(); | |
1380 verify_mark_mask(); | |
1381 verify_mark_bits(); | |
1382 } | |
1383 | |
1384 | |
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1385 void CommonMethodOopCache::init(Klass* k, Method* m, TRAPS) { |
0 | 1386 if (!UseSharedSpaces) { |
1387 _klass = k; | |
1388 } | |
1389 #ifndef PRODUCT | |
1390 else { | |
1391 // sharing initilization should have already set up _klass | |
1392 assert(_klass != NULL, "just checking"); | |
1393 } | |
1394 #endif | |
1395 | |
1396 _method_idnum = m->method_idnum(); | |
1397 assert(_method_idnum >= 0, "sanity check"); | |
1398 } | |
1399 | |
1400 | |
1401 ActiveMethodOopsCache::~ActiveMethodOopsCache() { | |
1402 if (_prev_methods != NULL) { | |
1403 delete _prev_methods; | |
1404 _prev_methods = NULL; | |
1405 } | |
1406 } | |
1407 | |
1408 | |
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1409 void ActiveMethodOopsCache::add_previous_version(Method* const method) { |
0 | 1410 assert(Thread::current()->is_VM_thread(), |
1411 "only VMThread can add previous versions"); | |
1412 | |
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1413 // Only append the previous method if it is executing on the stack. |
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1414 if (method->on_stack()) { |
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1415 |
0 | 1416 if (_prev_methods == NULL) { |
1417 // This is the first previous version so make some space. | |
1418 // Start with 2 elements under the assumption that the class | |
1419 // won't be redefined much. | |
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1420 _prev_methods = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Method*>(2, true); |
0 | 1421 } |
1422 | |
1423 // RC_TRACE macro has an embedded ResourceMark | |
1424 RC_TRACE(0x00000100, | |
1425 ("add: %s(%s): adding prev version ref for cached method @%d", | |
1426 method->name()->as_C_string(), method->signature()->as_C_string(), | |
1427 _prev_methods->length())); | |
1428 | |
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1429 _prev_methods->append(method); |
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1430 } |
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1431 |
0 | 1432 |
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1433 // Since the caller is the VMThread and we are at a safepoint, this is a good |
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1434 // time to clear out unused method references. |
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1435 |
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1436 if (_prev_methods == NULL) return; |
0 | 1437 |
1438 for (int i = _prev_methods->length() - 1; i >= 0; i--) { | |
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1439 Method* method = _prev_methods->at(i); |
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1440 assert(method != NULL, "weak method ref was unexpectedly cleared"); |
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1441 |
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1442 if (!method->on_stack()) { |
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1443 // This method isn't running anymore so remove it |
0 | 1444 _prev_methods->remove_at(i); |
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1445 MetadataFactory::free_metadata(method->method_holder()->class_loader_data(), method); |
0 | 1446 } else { |
1447 // RC_TRACE macro has an embedded ResourceMark | |
1448 RC_TRACE(0x00000400, ("add: %s(%s): previous cached method @%d is alive", | |
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1449 method->name()->as_C_string(), method->signature()->as_C_string(), i)); |
0 | 1450 } |
1451 } | |
1452 } // end add_previous_version() | |
1453 | |
1454 | |
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1455 bool ActiveMethodOopsCache::is_same_method(Method* const method) const { |
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1456 InstanceKlass* ik = InstanceKlass::cast(klass()); |
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1457 Method* check_method = ik->method_with_idnum(method_idnum()); |
0 | 1458 assert(check_method != NULL, "sanity check"); |
1459 if (check_method == method) { | |
1460 // done with the easy case | |
1461 return true; | |
1462 } | |
1463 | |
1464 if (_prev_methods != NULL) { | |
1465 // The cached method has been redefined at least once so search | |
1466 // the previous versions for a match. | |
1467 for (int i = 0; i < _prev_methods->length(); i++) { | |
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1468 check_method = _prev_methods->at(i); |
0 | 1469 if (check_method == method) { |
1470 // a previous version matches | |
1471 return true; | |
1472 } | |
1473 } | |
1474 } | |
1475 | |
1476 // either no previous versions or no previous version matched | |
1477 return false; | |
1478 } | |
1479 | |
1480 | |
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1481 Method* LatestMethodOopCache::get_Method() { |
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1482 InstanceKlass* ik = InstanceKlass::cast(klass()); |
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1483 Method* m = ik->method_with_idnum(method_idnum()); |
0 | 1484 assert(m != NULL, "sanity check"); |
1485 return m; | |
1486 } | |
1487 | |
1488 | |
1489 #ifdef ASSERT | |
1490 // Release dummy object(s) at bottom of heap | |
1491 bool Universe::release_fullgc_alot_dummy() { | |
1492 MutexLocker ml(FullGCALot_lock); | |
1493 if (_fullgc_alot_dummy_array != NULL) { | |
1494 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { | |
1495 // No more dummies to release, release entire array instead | |
1496 _fullgc_alot_dummy_array = NULL; | |
1497 return false; | |
1498 } | |
1499 if (!UseConcMarkSweepGC) { | |
1500 // Release dummy at bottom of old generation | |
1501 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
1502 } | |
1503 // Release dummy at bottom of permanent generation | |
1504 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
1505 } | |
1506 return true; | |
1507 } | |
1508 | |
1509 #endif // ASSERT |