Mercurial > hg > truffle
annotate src/share/vm/memory/universe.cpp @ 7090:05ce1defa4f9
Common out some parts of UnsafeLoad/Store in UnsafeAccess
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 29 Nov 2012 13:24:08 +0100 |
parents | 80e866b1d053 |
children | 59c790074993 f34d701e952e |
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 * | |
1552
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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" | |
65 #include "runtime/timer.hpp" | |
66 #include "runtime/vm_operations.hpp" | |
67 #include "services/memoryService.hpp" | |
68 #include "utilities/copy.hpp" | |
69 #include "utilities/events.hpp" | |
70 #include "utilities/hashtable.inline.hpp" | |
71 #include "utilities/preserveException.hpp" | |
72 #ifdef TARGET_OS_FAMILY_linux | |
73 # include "thread_linux.inline.hpp" | |
74 #endif | |
75 #ifdef TARGET_OS_FAMILY_solaris | |
76 # include "thread_solaris.inline.hpp" | |
77 #endif | |
78 #ifdef TARGET_OS_FAMILY_windows | |
79 # include "thread_windows.inline.hpp" | |
80 #endif | |
3960 | 81 #ifdef TARGET_OS_FAMILY_bsd |
82 # include "thread_bsd.inline.hpp" | |
83 #endif | |
1972 | 84 #ifndef SERIALGC |
85 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" | |
86 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp" | |
87 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
88 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
89 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
90 #endif | |
0 | 91 |
92 // Known objects | |
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93 Klass* Universe::_boolArrayKlassObj = NULL; |
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94 Klass* Universe::_byteArrayKlassObj = NULL; |
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95 Klass* Universe::_charArrayKlassObj = NULL; |
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96 Klass* Universe::_intArrayKlassObj = NULL; |
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97 Klass* Universe::_shortArrayKlassObj = NULL; |
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98 Klass* Universe::_longArrayKlassObj = NULL; |
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99 Klass* Universe::_singleArrayKlassObj = NULL; |
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100 Klass* Universe::_doubleArrayKlassObj = NULL; |
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101 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; |
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102 Klass* Universe::_objectArrayKlassObj = NULL; |
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103 oop Universe::_int_mirror = NULL; |
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104 oop Universe::_float_mirror = NULL; |
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105 oop Universe::_double_mirror = NULL; |
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106 oop Universe::_byte_mirror = NULL; |
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107 oop Universe::_bool_mirror = NULL; |
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108 oop Universe::_char_mirror = NULL; |
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109 oop Universe::_long_mirror = NULL; |
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110 oop Universe::_short_mirror = NULL; |
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111 oop Universe::_void_mirror = NULL; |
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112 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; |
0 | 113 oop Universe::_main_thread_group = NULL; |
114 oop Universe::_system_thread_group = NULL; | |
115 objArrayOop Universe::_the_empty_class_klass_array = NULL; | |
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116 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; |
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117 oop Universe::_the_null_string = NULL; |
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118 oop Universe::_the_min_jint_string = NULL; |
0 | 119 LatestMethodOopCache* Universe::_finalizer_register_cache = NULL; |
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120 LatestMethodOopCache* Universe::_loader_addClass_cache = NULL; |
0 | 121 ActiveMethodOopsCache* Universe::_reflect_invoke_cache = NULL; |
122 oop Universe::_out_of_memory_error_java_heap = NULL; | |
123 oop Universe::_out_of_memory_error_perm_gen = NULL; | |
124 oop Universe::_out_of_memory_error_array_size = NULL; | |
125 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; | |
126 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; | |
127 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; | |
128 bool Universe::_verify_in_progress = false; | |
129 oop Universe::_null_ptr_exception_instance = NULL; | |
130 oop Universe::_arithmetic_exception_instance = NULL; | |
131 oop Universe::_virtual_machine_error_instance = NULL; | |
132 oop Universe::_vm_exception = NULL; | |
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133 Array<int>* Universe::_the_empty_int_array = NULL; |
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134 Array<u2>* Universe::_the_empty_short_array = NULL; |
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135 Array<Klass*>* Universe::_the_empty_klass_array = NULL; |
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136 Array<Method*>* Universe::_the_empty_method_array = NULL; |
0 | 137 |
138 // These variables are guarded by FullGCALot_lock. | |
139 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) | |
140 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) | |
141 | |
142 // Heap | |
143 int Universe::_verify_count = 0; | |
144 | |
145 int Universe::_base_vtable_size = 0; | |
146 bool Universe::_bootstrapping = false; | |
147 bool Universe::_fully_initialized = false; | |
148 | |
149 size_t Universe::_heap_capacity_at_last_gc; | |
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150 size_t Universe::_heap_used_at_last_gc = 0; |
0 | 151 |
152 CollectedHeap* Universe::_collectedHeap = NULL; | |
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153 |
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154 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; |
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155 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; |
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156 address Universe::_narrow_ptrs_base; |
0 | 157 |
158 | |
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159 void Universe::basic_type_classes_do(void f(Klass*)) { |
0 | 160 f(boolArrayKlassObj()); |
161 f(byteArrayKlassObj()); | |
162 f(charArrayKlassObj()); | |
163 f(intArrayKlassObj()); | |
164 f(shortArrayKlassObj()); | |
165 f(longArrayKlassObj()); | |
166 f(singleArrayKlassObj()); | |
167 f(doubleArrayKlassObj()); | |
168 } | |
169 | |
170 void Universe::oops_do(OopClosure* f, bool do_all) { | |
171 | |
172 f->do_oop((oop*) &_int_mirror); | |
173 f->do_oop((oop*) &_float_mirror); | |
174 f->do_oop((oop*) &_double_mirror); | |
175 f->do_oop((oop*) &_byte_mirror); | |
176 f->do_oop((oop*) &_bool_mirror); | |
177 f->do_oop((oop*) &_char_mirror); | |
178 f->do_oop((oop*) &_long_mirror); | |
179 f->do_oop((oop*) &_short_mirror); | |
180 f->do_oop((oop*) &_void_mirror); | |
181 | |
182 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
183 f->do_oop((oop*) &_mirrors[i]); | |
184 } | |
185 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); | |
186 | |
187 f->do_oop((oop*)&_the_empty_class_klass_array); | |
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188 f->do_oop((oop*)&_the_null_string); |
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189 f->do_oop((oop*)&_the_min_jint_string); |
0 | 190 f->do_oop((oop*)&_out_of_memory_error_java_heap); |
191 f->do_oop((oop*)&_out_of_memory_error_perm_gen); | |
192 f->do_oop((oop*)&_out_of_memory_error_array_size); | |
193 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); | |
194 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); | |
195 f->do_oop((oop*)&_null_ptr_exception_instance); | |
196 f->do_oop((oop*)&_arithmetic_exception_instance); | |
197 f->do_oop((oop*)&_virtual_machine_error_instance); | |
198 f->do_oop((oop*)&_main_thread_group); | |
199 f->do_oop((oop*)&_system_thread_group); | |
200 f->do_oop((oop*)&_vm_exception); | |
201 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) | |
202 } | |
203 | |
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204 // Serialize metadata in and out of CDS archive, not oops. |
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205 void Universe::serialize(SerializeClosure* f, bool do_all) { |
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206 |
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207 f->do_ptr((void**)&_boolArrayKlassObj); |
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208 f->do_ptr((void**)&_byteArrayKlassObj); |
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209 f->do_ptr((void**)&_charArrayKlassObj); |
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210 f->do_ptr((void**)&_intArrayKlassObj); |
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211 f->do_ptr((void**)&_shortArrayKlassObj); |
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212 f->do_ptr((void**)&_longArrayKlassObj); |
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213 f->do_ptr((void**)&_singleArrayKlassObj); |
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214 f->do_ptr((void**)&_doubleArrayKlassObj); |
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215 f->do_ptr((void**)&_objectArrayKlassObj); |
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216 |
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217 { |
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218 for (int i = 0; i < T_VOID+1; i++) { |
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219 if (_typeArrayKlassObjs[i] != NULL) { |
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220 assert(i >= T_BOOLEAN, "checking"); |
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221 f->do_ptr((void**)&_typeArrayKlassObjs[i]); |
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222 } else if (do_all) { |
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223 f->do_ptr((void**)&_typeArrayKlassObjs[i]); |
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224 } |
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225 } |
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226 } |
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227 |
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228 f->do_ptr((void**)&_the_array_interfaces_array); |
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229 f->do_ptr((void**)&_the_empty_int_array); |
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230 f->do_ptr((void**)&_the_empty_short_array); |
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231 f->do_ptr((void**)&_the_empty_method_array); |
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232 f->do_ptr((void**)&_the_empty_klass_array); |
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233 _finalizer_register_cache->serialize(f); |
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234 _loader_addClass_cache->serialize(f); |
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235 _reflect_invoke_cache->serialize(f); |
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236 } |
0 | 237 |
238 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { | |
239 if (size < alignment || size % alignment != 0) { | |
240 ResourceMark rm; | |
241 stringStream st; | |
242 st.print("Size of %s (%ld bytes) must be aligned to %ld bytes", name, size, alignment); | |
243 char* error = st.as_string(); | |
244 vm_exit_during_initialization(error); | |
245 } | |
246 } | |
247 | |
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248 void initialize_basic_type_klass(Klass* k, TRAPS) { |
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249 Klass* ok = SystemDictionary::Object_klass(); |
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250 if (UseSharedSpaces) { |
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251 assert(k->super() == ok, "u3"); |
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252 k->restore_unshareable_info(CHECK); |
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253 } else { |
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254 k->initialize_supers(ok, CHECK); |
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255 } |
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256 k->append_to_sibling_list(); |
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257 } |
0 | 258 |
259 void Universe::genesis(TRAPS) { | |
260 ResourceMark rm; | |
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261 |
0 | 262 { FlagSetting fs(_bootstrapping, true); |
263 | |
264 { MutexLocker mc(Compile_lock); | |
265 | |
266 // determine base vtable size; without that we cannot create the array klasses | |
267 compute_base_vtable_size(); | |
268 | |
269 if (!UseSharedSpaces) { | |
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270 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); |
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271 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); |
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272 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); |
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273 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); |
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274 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); |
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275 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); |
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276 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); |
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277 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); |
0 | 278 |
279 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; | |
280 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; | |
281 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; | |
282 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; | |
283 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; | |
284 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; | |
285 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; | |
286 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; | |
287 | |
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288 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); |
0 | 289 |
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290 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); |
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291 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); |
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292 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); |
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293 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); |
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294 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); |
0 | 295 } |
296 } | |
297 | |
298 vmSymbols::initialize(CHECK); | |
299 | |
300 SystemDictionary::initialize(CHECK); | |
301 | |
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302 Klass* ok = SystemDictionary::Object_klass(); |
0 | 303 |
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304 _the_null_string = StringTable::intern("null", CHECK); |
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305 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); |
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306 |
0 | 307 if (UseSharedSpaces) { |
308 // Verify shared interfaces array. | |
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309 assert(_the_array_interfaces_array->at(0) == |
1142 | 310 SystemDictionary::Cloneable_klass(), "u3"); |
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311 assert(_the_array_interfaces_array->at(1) == |
1142 | 312 SystemDictionary::Serializable_klass(), "u3"); |
0 | 313 } else { |
314 // Set up shared interfaces array. (Do this before supers are set up.) | |
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315 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); |
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316 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); |
0 | 317 } |
318 | |
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319 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); |
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320 initialize_basic_type_klass(charArrayKlassObj(), CHECK); |
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321 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); |
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322 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); |
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323 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); |
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324 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); |
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325 initialize_basic_type_klass(intArrayKlassObj(), CHECK); |
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326 initialize_basic_type_klass(longArrayKlassObj(), CHECK); |
0 | 327 } // end of core bootstrapping |
328 | |
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329 // Maybe this could be lifted up now that object array can be initialized |
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330 // during the bootstrapping. |
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331 |
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332 // OLD |
0 | 333 // Initialize _objectArrayKlass after core bootstraping to make |
334 // sure the super class is set up properly for _objectArrayKlass. | |
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335 // --- |
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336 // NEW |
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337 // Since some of the old system object arrays have been converted to |
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338 // ordinary object arrays, _objectArrayKlass will be loaded when |
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339 // SystemDictionary::initialize(CHECK); is run. See the extra check |
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340 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. |
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341 _objectArrayKlassObj = InstanceKlass:: |
1142 | 342 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); |
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343 // OLD |
0 | 344 // Add the class to the class hierarchy manually to make sure that |
345 // its vtable is initialized after core bootstrapping is completed. | |
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346 // --- |
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347 // New |
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348 // Have already been initialized. |
6983 | 349 _objectArrayKlassObj->append_to_sibling_list(); |
0 | 350 |
351 // Compute is_jdk version flags. | |
352 // Only 1.3 or later has the java.lang.Shutdown class. | |
353 // Only 1.4 or later has the java.lang.CharSequence interface. | |
354 // Only 1.5 or later has the java.lang.management.MemoryUsage class. | |
242 | 355 if (JDK_Version::is_partially_initialized()) { |
356 uint8_t jdk_version; | |
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357 Klass* k = SystemDictionary::resolve_or_null( |
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358 vmSymbols::java_lang_management_MemoryUsage(), THREAD); |
0 | 359 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
360 if (k == NULL) { | |
242 | 361 k = SystemDictionary::resolve_or_null( |
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362 vmSymbols::java_lang_CharSequence(), THREAD); |
0 | 363 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
364 if (k == NULL) { | |
242 | 365 k = SystemDictionary::resolve_or_null( |
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366 vmSymbols::java_lang_Shutdown(), THREAD); |
0 | 367 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
368 if (k == NULL) { | |
242 | 369 jdk_version = 2; |
0 | 370 } else { |
242 | 371 jdk_version = 3; |
0 | 372 } |
373 } else { | |
242 | 374 jdk_version = 4; |
0 | 375 } |
376 } else { | |
242 | 377 jdk_version = 5; |
0 | 378 } |
242 | 379 JDK_Version::fully_initialize(jdk_version); |
0 | 380 } |
381 | |
382 #ifdef ASSERT | |
383 if (FullGCALot) { | |
384 // Allocate an array of dummy objects. | |
385 // We'd like these to be at the bottom of the old generation, | |
386 // so that when we free one and then collect, | |
387 // (almost) the whole heap moves | |
388 // and we find out if we actually update all the oops correctly. | |
389 // But we can't allocate directly in the old generation, | |
390 // so we allocate wherever, and hope that the first collection | |
391 // moves these objects to the bottom of the old generation. | |
392 // We can allocate directly in the permanent generation, so we do. | |
393 int size; | |
394 if (UseConcMarkSweepGC) { | |
395 warning("Using +FullGCALot with concurrent mark sweep gc " | |
396 "will not force all objects to relocate"); | |
397 size = FullGCALotDummies; | |
398 } else { | |
399 size = FullGCALotDummies * 2; | |
400 } | |
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401 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); |
0 | 402 objArrayHandle dummy_array(THREAD, naked_array); |
403 int i = 0; | |
404 while (i < size) { | |
405 // Allocate dummy in old generation | |
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406 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); |
0 | 407 dummy_array->obj_at_put(i++, dummy); |
408 } | |
409 { | |
410 // Only modify the global variable inside the mutex. | |
411 // If we had a race to here, the other dummy_array instances | |
412 // and their elements just get dropped on the floor, which is fine. | |
413 MutexLocker ml(FullGCALot_lock); | |
414 if (_fullgc_alot_dummy_array == NULL) { | |
415 _fullgc_alot_dummy_array = dummy_array(); | |
416 } | |
417 } | |
418 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); | |
419 } | |
420 #endif | |
421 } | |
422 | |
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423 // CDS support for patching vtables in metadata in the shared archive. |
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424 // All types inherited from Metadata have vtables, but not types inherited |
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425 // from MetaspaceObj, because the latter does not have virtual functions. |
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426 // If the metadata type has a vtable, it cannot be shared in the read-only |
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427 // section of the CDS archive, because the vtable pointer is patched. |
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428 static inline void* dereference(void* addr) { |
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429 return *(void**)addr; |
0 | 430 } |
431 | |
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432 static inline void add_vtable(void** list, int* n, void* o, int count) { |
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433 guarantee((*n) < count, "vtable list too small"); |
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434 void* vtable = dereference(o); |
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435 assert(dereference(vtable) != NULL, "invalid vtable"); |
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436 list[(*n)++] = vtable; |
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437 } |
0 | 438 |
439 void Universe::init_self_patching_vtbl_list(void** list, int count) { | |
440 int n = 0; | |
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441 { InstanceKlass o; add_vtable(list, &n, &o, count); } |
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442 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } |
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443 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } |
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444 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } |
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445 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } |
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446 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } |
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447 { Method o; add_vtable(list, &n, &o, count); } |
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448 { ConstantPool o; add_vtable(list, &n, &o, count); } |
0 | 449 } |
450 | |
451 void Universe::initialize_basic_type_mirrors(TRAPS) { | |
452 assert(_int_mirror==NULL, "basic type mirrors already initialized"); | |
453 _int_mirror = | |
454 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); | |
455 _float_mirror = | |
456 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); | |
457 _double_mirror = | |
458 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); | |
459 _byte_mirror = | |
460 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); | |
461 _bool_mirror = | |
462 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); | |
463 _char_mirror = | |
464 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); | |
465 _long_mirror = | |
466 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); | |
467 _short_mirror = | |
468 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); | |
469 _void_mirror = | |
470 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); | |
471 | |
472 _mirrors[T_INT] = _int_mirror; | |
473 _mirrors[T_FLOAT] = _float_mirror; | |
474 _mirrors[T_DOUBLE] = _double_mirror; | |
475 _mirrors[T_BYTE] = _byte_mirror; | |
476 _mirrors[T_BOOLEAN] = _bool_mirror; | |
477 _mirrors[T_CHAR] = _char_mirror; | |
478 _mirrors[T_LONG] = _long_mirror; | |
479 _mirrors[T_SHORT] = _short_mirror; | |
480 _mirrors[T_VOID] = _void_mirror; | |
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481 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); |
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482 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); |
0 | 483 } |
484 | |
485 void Universe::fixup_mirrors(TRAPS) { | |
486 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, | |
487 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply | |
488 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note | |
489 // that the number of objects allocated at this point is very small. | |
1142 | 490 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); |
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491 HandleMark hm(THREAD); |
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492 // Cache the start of the static fields |
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493 InstanceMirrorKlass::init_offset_of_static_fields(); |
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494 |
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495 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); |
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496 int list_length = list->length(); |
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497 for (int i = 0; i < list_length; i++) { |
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498 Klass* k = list->at(i); |
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499 assert(k->is_klass(), "List should only hold classes"); |
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500 EXCEPTION_MARK; |
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501 KlassHandle kh(THREAD, k); |
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502 java_lang_Class::fixup_mirror(kh, CATCH); |
0 | 503 } |
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504 delete java_lang_Class::fixup_mirror_list(); |
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505 java_lang_Class::set_fixup_mirror_list(NULL); |
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506 } |
0 | 507 |
508 static bool has_run_finalizers_on_exit = false; | |
509 | |
510 void Universe::run_finalizers_on_exit() { | |
511 if (has_run_finalizers_on_exit) return; | |
512 has_run_finalizers_on_exit = true; | |
513 | |
514 // Called on VM exit. This ought to be run in a separate thread. | |
515 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); | |
516 { | |
517 PRESERVE_EXCEPTION_MARK; | |
1142 | 518 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); |
0 | 519 JavaValue result(T_VOID); |
520 JavaCalls::call_static( | |
521 &result, | |
522 finalizer_klass, | |
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523 vmSymbols::run_finalizers_on_exit_name(), |
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524 vmSymbols::void_method_signature(), |
0 | 525 THREAD |
526 ); | |
527 // Ignore any pending exceptions | |
528 CLEAR_PENDING_EXCEPTION; | |
529 } | |
530 } | |
531 | |
532 | |
533 // initialize_vtable could cause gc if | |
534 // 1) we specified true to initialize_vtable and | |
535 // 2) this ran after gc was enabled | |
536 // In case those ever change we use handles for oops | |
537 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { | |
538 // init vtable of k and all subclasses | |
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539 Klass* ko = k_h(); |
0 | 540 klassVtable* vt = ko->vtable(); |
541 if (vt) vt->initialize_vtable(false, CHECK); | |
542 if (ko->oop_is_instance()) { | |
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543 InstanceKlass* ik = (InstanceKlass*)ko; |
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544 for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->next_sibling())) { |
0 | 545 reinitialize_vtable_of(s_h, CHECK); |
546 } | |
547 } | |
548 } | |
549 | |
550 | |
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551 void initialize_itable_for_klass(Klass* k, TRAPS) { |
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552 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); |
0 | 553 } |
554 | |
555 | |
556 void Universe::reinitialize_itables(TRAPS) { | |
557 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); | |
558 | |
559 } | |
560 | |
561 | |
562 bool Universe::on_page_boundary(void* addr) { | |
563 return ((uintptr_t) addr) % os::vm_page_size() == 0; | |
564 } | |
565 | |
566 | |
567 bool Universe::should_fill_in_stack_trace(Handle throwable) { | |
568 // never attempt to fill in the stack trace of preallocated errors that do not have | |
569 // backtrace. These errors are kept alive forever and may be "re-used" when all | |
570 // preallocated errors with backtrace have been consumed. Also need to avoid | |
571 // a potential loop which could happen if an out of memory occurs when attempting | |
572 // to allocate the backtrace. | |
573 return ((throwable() != Universe::_out_of_memory_error_java_heap) && | |
574 (throwable() != Universe::_out_of_memory_error_perm_gen) && | |
575 (throwable() != Universe::_out_of_memory_error_array_size) && | |
576 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); | |
577 } | |
578 | |
579 | |
580 oop Universe::gen_out_of_memory_error(oop default_err) { | |
581 // generate an out of memory error: | |
582 // - if there is a preallocated error with backtrace available then return it wth | |
583 // a filled in stack trace. | |
584 // - if there are no preallocated errors with backtrace available then return | |
585 // an error without backtrace. | |
586 int next; | |
587 if (_preallocated_out_of_memory_error_avail_count > 0) { | |
588 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); | |
589 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); | |
590 } else { | |
591 next = -1; | |
592 } | |
593 if (next < 0) { | |
594 // all preallocated errors have been used. | |
595 // return default | |
596 return default_err; | |
597 } else { | |
598 // get the error object at the slot and set set it to NULL so that the | |
599 // array isn't keeping it alive anymore. | |
600 oop exc = preallocated_out_of_memory_errors()->obj_at(next); | |
601 assert(exc != NULL, "slot has been used already"); | |
602 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); | |
603 | |
604 // use the message from the default error | |
605 oop msg = java_lang_Throwable::message(default_err); | |
606 assert(msg != NULL, "no message"); | |
607 java_lang_Throwable::set_message(exc, msg); | |
608 | |
609 // populate the stack trace and return it. | |
610 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); | |
611 return exc; | |
612 } | |
613 } | |
614 | |
615 static intptr_t non_oop_bits = 0; | |
616 | |
617 void* Universe::non_oop_word() { | |
618 // Neither the high bits nor the low bits of this value is allowed | |
619 // to look like (respectively) the high or low bits of a real oop. | |
620 // | |
621 // High and low are CPU-specific notions, but low always includes | |
622 // the low-order bit. Since oops are always aligned at least mod 4, | |
623 // setting the low-order bit will ensure that the low half of the | |
624 // word will never look like that of a real oop. | |
625 // | |
626 // Using the OS-supplied non-memory-address word (usually 0 or -1) | |
627 // will take care of the high bits, however many there are. | |
628 | |
629 if (non_oop_bits == 0) { | |
630 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; | |
631 } | |
632 | |
633 return (void*)non_oop_bits; | |
634 } | |
635 | |
636 jint universe_init() { | |
637 assert(!Universe::_fully_initialized, "called after initialize_vtables"); | |
638 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), | |
639 "LogHeapWordSize is incorrect."); | |
640 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); | |
641 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, | |
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642 "oop size is not not a multiple of HeapWord size"); |
0 | 643 TraceTime timer("Genesis", TraceStartupTime); |
644 GC_locker::lock(); // do not allow gc during bootstrapping | |
645 JavaClasses::compute_hard_coded_offsets(); | |
646 | |
647 jint status = Universe::initialize_heap(); | |
648 if (status != JNI_OK) { | |
649 return status; | |
650 } | |
651 | |
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652 // Create memory for metadata. Must be after initializing heap for |
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653 // DumpSharedSpaces. |
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654 ClassLoaderData::init_null_class_loader_data(); |
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655 |
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656 // We have a heap so create the Method* caches before |
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657 // Metaspace::initialize_shared_spaces() tries to populate them. |
0 | 658 Universe::_finalizer_register_cache = new LatestMethodOopCache(); |
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659 Universe::_loader_addClass_cache = new LatestMethodOopCache(); |
0 | 660 Universe::_reflect_invoke_cache = new ActiveMethodOopsCache(); |
661 | |
662 if (UseSharedSpaces) { | |
663 // Read the data structures supporting the shared spaces (shared | |
664 // system dictionary, symbol table, etc.). After that, access to | |
665 // the file (other than the mapped regions) is no longer needed, and | |
666 // the file is closed. Closing the file does not affect the | |
667 // currently mapped regions. | |
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668 MetaspaceShared::initialize_shared_spaces(); |
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669 StringTable::create_table(); |
0 | 670 } else { |
671 SymbolTable::create_table(); | |
672 StringTable::create_table(); | |
673 ClassLoader::create_package_info_table(); | |
674 } | |
675 | |
676 return JNI_OK; | |
677 } | |
678 | |
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679 // Choose the heap base address and oop encoding mode |
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680 // when compressed oops are used: |
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681 // Unscaled - Use 32-bits oops without encoding when |
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682 // NarrowOopHeapBaseMin + heap_size < 4Gb |
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683 // ZeroBased - Use zero based compressed oops with encoding when |
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684 // NarrowOopHeapBaseMin + heap_size < 32Gb |
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685 // HeapBased - Use compressed oops with heap base + encoding. |
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686 |
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687 // 4Gb |
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688 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); |
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689 // 32Gb |
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690 // OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes; |
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691 |
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692 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) { |
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693 size_t base = 0; |
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694 #ifdef _LP64 |
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695 if (UseCompressedOops) { |
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696 assert(mode == UnscaledNarrowOop || |
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697 mode == ZeroBasedNarrowOop || |
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698 mode == HeapBasedNarrowOop, "mode is invalid"); |
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699 const size_t total_size = heap_size + HeapBaseMinAddress; |
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700 // Return specified base for the first request. |
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701 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { |
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702 base = HeapBaseMinAddress; |
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703 } else if (total_size <= OopEncodingHeapMax && (mode != HeapBasedNarrowOop)) { |
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704 if (total_size <= NarrowOopHeapMax && (mode == UnscaledNarrowOop) && |
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705 (Universe::narrow_oop_shift() == 0)) { |
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706 // Use 32-bits oops without encoding and |
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707 // place heap's top on the 4Gb boundary |
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708 base = (NarrowOopHeapMax - heap_size); |
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709 } else { |
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710 // Can't reserve with NarrowOopShift == 0 |
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711 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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712 if (mode == UnscaledNarrowOop || |
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713 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { |
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714 // Use zero based compressed oops with encoding and |
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715 // place heap's top on the 32Gb boundary in case |
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716 // total_size > 4Gb or failed to reserve below 4Gb. |
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717 base = (OopEncodingHeapMax - heap_size); |
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718 } |
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719 } |
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720 } else { |
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721 // Can't reserve below 32Gb. |
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722 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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723 } |
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724 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks |
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725 // used in ReservedHeapSpace() constructors. |
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726 // The final values will be set in initialize_heap() below. |
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727 if (base != 0 && (base + heap_size) <= OopEncodingHeapMax) { |
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728 // Use zero based compressed oops |
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729 Universe::set_narrow_oop_base(NULL); |
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730 // Don't need guard page for implicit checks in indexed |
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731 // addressing mode with zero based Compressed Oops. |
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732 Universe::set_narrow_oop_use_implicit_null_checks(true); |
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733 } else { |
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734 // Set to a non-NULL value so the ReservedSpace ctor computes |
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735 // the correct no-access prefix. |
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736 // The final value will be set in initialize_heap() below. |
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737 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); |
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738 #ifdef _WIN64 |
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739 if (UseLargePages) { |
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740 // Cannot allocate guard pages for implicit checks in indexed |
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741 // addressing mode when large pages are specified on windows. |
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742 Universe::set_narrow_oop_use_implicit_null_checks(false); |
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743 } |
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744 #endif // _WIN64 |
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745 } |
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746 } |
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747 #endif |
1057
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748 return (char*)base; // also return NULL (don't care) for 32-bit VM |
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749 } |
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750 |
0 | 751 jint Universe::initialize_heap() { |
752 | |
753 if (UseParallelGC) { | |
754 #ifndef SERIALGC | |
755 Universe::_collectedHeap = new ParallelScavengeHeap(); | |
756 #else // SERIALGC | |
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757 fatal("UseParallelGC not supported in this VM."); |
0 | 758 #endif // SERIALGC |
759 | |
342
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760 } else if (UseG1GC) { |
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761 #ifndef SERIALGC |
4013 | 762 G1CollectorPolicy* g1p = new G1CollectorPolicy(); |
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763 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); |
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764 Universe::_collectedHeap = g1h; |
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765 #else // SERIALGC |
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766 fatal("UseG1GC not supported in java kernel vm."); |
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767 #endif // SERIALGC |
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768 |
0 | 769 } else { |
770 GenCollectorPolicy *gc_policy; | |
771 | |
772 if (UseSerialGC) { | |
773 gc_policy = new MarkSweepPolicy(); | |
774 } else if (UseConcMarkSweepGC) { | |
775 #ifndef SERIALGC | |
776 if (UseAdaptiveSizePolicy) { | |
777 gc_policy = new ASConcurrentMarkSweepPolicy(); | |
778 } else { | |
779 gc_policy = new ConcurrentMarkSweepPolicy(); | |
780 } | |
781 #else // SERIALGC | |
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782 fatal("UseConcMarkSweepGC not supported in this VM."); |
0 | 783 #endif // SERIALGC |
784 } else { // default old generation | |
785 gc_policy = new MarkSweepPolicy(); | |
786 } | |
787 | |
788 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); | |
789 } | |
790 | |
791 jint status = Universe::heap()->initialize(); | |
792 if (status != JNI_OK) { | |
793 return status; | |
794 } | |
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795 |
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796 #ifdef _LP64 |
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797 if (UseCompressedOops) { |
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798 // Subtract a page because something can get allocated at heap base. |
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799 // This also makes implicit null checking work, because the |
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800 // memory+1 page below heap_base needs to cause a signal. |
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801 // See needs_explicit_null_check. |
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802 // Only set the heap base for compressed oops because it indicates |
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803 // compressed oops for pstack code. |
2080 | 804 bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose); |
805 if (verbose) { | |
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806 tty->cr(); |
1963 | 807 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", |
808 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); | |
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809 } |
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810 if ((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax) { |
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811 // Can't reserve heap below 32Gb. |
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812 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap() |
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813 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
2080 | 814 if (verbose) { |
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815 tty->print(", Compressed Oops with base: "PTR_FORMAT, Universe::narrow_oop_base()); |
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816 } |
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817 } else { |
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818 Universe::set_narrow_oop_base(0); |
2080 | 819 if (verbose) { |
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820 tty->print(", zero based Compressed Oops"); |
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821 } |
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822 #ifdef _WIN64 |
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823 if (!Universe::narrow_oop_use_implicit_null_checks()) { |
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824 // Don't need guard page for implicit checks in indexed addressing |
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825 // mode with zero based Compressed Oops. |
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826 Universe::set_narrow_oop_use_implicit_null_checks(true); |
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827 } |
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828 #endif // _WIN64 |
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829 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { |
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830 // Can't reserve heap below 4Gb. |
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831 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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832 } else { |
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833 Universe::set_narrow_oop_shift(0); |
2080 | 834 if (verbose) { |
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835 tty->print(", 32-bits Oops"); |
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836 } |
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837 } |
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838 } |
2080 | 839 if (verbose) { |
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840 tty->cr(); |
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841 tty->cr(); |
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842 } |
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843 if (UseCompressedKlassPointers) { |
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844 Universe::set_narrow_klass_base(Universe::narrow_oop_base()); |
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845 Universe::set_narrow_klass_shift(MIN2(Universe::narrow_oop_shift(), LogKlassAlignmentInBytes)); |
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846 } |
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847 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); |
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848 } |
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849 // Universe::narrow_oop_base() is one page below the metaspace |
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850 // base. The actual metaspace base depends on alignment constraints |
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851 // so we don't know its exact location here. |
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852 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - os::vm_page_size() - ClassMetaspaceSize) || |
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853 Universe::narrow_oop_base() == NULL, "invalid value"); |
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854 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || |
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855 Universe::narrow_oop_shift() == 0, "invalid value"); |
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856 #endif |
0 | 857 |
858 // We will never reach the CATCH below since Exceptions::_throw will cause | |
859 // the VM to exit if an exception is thrown during initialization | |
860 | |
861 if (UseTLAB) { | |
862 assert(Universe::heap()->supports_tlab_allocation(), | |
863 "Should support thread-local allocation buffers"); | |
864 ThreadLocalAllocBuffer::startup_initialization(); | |
865 } | |
866 return JNI_OK; | |
867 } | |
868 | |
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869 |
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870 // Reserve the Java heap, which is now the same for all GCs. |
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871 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { |
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872 // Add in the class metaspace area so the classes in the headers can |
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873 // be compressed the same as instances. |
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874 // Need to round class space size up because it's below the heap and |
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875 // the actual alignment depends on its size. |
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876 size_t metaspace_size = align_size_up(ClassMetaspaceSize, alignment); |
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877 size_t total_reserved = align_size_up(heap_size + metaspace_size, alignment); |
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878 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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879 |
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880 ReservedHeapSpace total_rs(total_reserved, alignment, UseLargePages, addr); |
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881 |
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882 if (UseCompressedOops) { |
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883 if (addr != NULL && !total_rs.is_reserved()) { |
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884 // Failed to reserve at specified address - the requested memory |
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885 // region is taken already, for example, by 'java' launcher. |
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886 // Try again to reserver heap higher. |
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887 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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888 |
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889 ReservedHeapSpace total_rs0(total_reserved, alignment, |
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890 UseLargePages, addr); |
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891 |
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892 if (addr != NULL && !total_rs0.is_reserved()) { |
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893 // Failed to reserve at specified address again - give up. |
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894 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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895 assert(addr == NULL, ""); |
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896 |
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897 ReservedHeapSpace total_rs1(total_reserved, alignment, |
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898 UseLargePages, addr); |
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899 total_rs = total_rs1; |
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900 } else { |
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901 total_rs = total_rs0; |
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902 } |
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903 } |
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904 } |
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905 |
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906 if (!total_rs.is_reserved()) { |
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907 vm_exit_during_initialization(err_msg("Could not reserve enough space for object heap %d bytes", total_reserved)); |
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908 return total_rs; |
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909 } |
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910 |
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911 // Split the reserved space into main Java heap and a space for |
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912 // classes so that they can be compressed using the same algorithm |
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913 // as compressed oops. If compress oops and compress klass ptrs are |
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914 // used we need the meta space first: if the alignment used for |
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915 // compressed oops is greater than the one used for compressed klass |
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916 // ptrs, a metadata space on top of the heap could become |
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917 // unreachable. |
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918 ReservedSpace class_rs = total_rs.first_part(metaspace_size); |
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919 ReservedSpace heap_rs = total_rs.last_part(metaspace_size, alignment); |
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920 Metaspace::initialize_class_space(class_rs); |
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921 |
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922 if (UseCompressedOops) { |
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923 // Universe::initialize_heap() will reset this to NULL if unscaled |
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924 // or zero-based narrow oops are actually used. |
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925 address base = (address)(total_rs.base() - os::vm_page_size()); |
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926 Universe::set_narrow_oop_base(base); |
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927 } |
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928 return heap_rs; |
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929 } |
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930 |
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931 |
0 | 932 // It's the caller's repsonsibility to ensure glitch-freedom |
933 // (if required). | |
934 void Universe::update_heap_info_at_gc() { | |
935 _heap_capacity_at_last_gc = heap()->capacity(); | |
936 _heap_used_at_last_gc = heap()->used(); | |
937 } | |
938 | |
939 | |
940 | |
941 void universe2_init() { | |
942 EXCEPTION_MARK; | |
943 Universe::genesis(CATCH); | |
944 // Although we'd like to verify here that the state of the heap | |
945 // is good, we can't because the main thread has not yet added | |
946 // itself to the threads list (so, using current interfaces | |
947 // we can't "fill" its TLAB), unless TLABs are disabled. | |
948 if (VerifyBeforeGC && !UseTLAB && | |
949 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
950 Universe::heap()->prepare_for_verify(); | |
951 Universe::verify(); // make sure we're starting with a clean slate | |
952 } | |
953 } | |
954 | |
955 | |
956 // This function is defined in JVM.cpp | |
957 extern void initialize_converter_functions(); | |
958 | |
959 bool universe_post_init() { | |
1959
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960 assert(!is_init_completed(), "Error: initialization not yet completed!"); |
0 | 961 Universe::_fully_initialized = true; |
962 EXCEPTION_MARK; | |
963 { ResourceMark rm; | |
964 Interpreter::initialize(); // needed for interpreter entry points | |
965 if (!UseSharedSpaces) { | |
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966 HandleMark hm(THREAD); |
1142 | 967 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); |
0 | 968 Universe::reinitialize_vtable_of(ok_h, CHECK_false); |
969 Universe::reinitialize_itables(CHECK_false); | |
970 } | |
971 } | |
972 | |
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973 HandleMark hm(THREAD); |
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974 Klass* k; |
0 | 975 instanceKlassHandle k_h; |
976 // Setup preallocated empty java.lang.Class array | |
1142 | 977 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); |
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978 |
0 | 979 // Setup preallocated OutOfMemoryError errors |
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980 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); |
0 | 981 k_h = instanceKlassHandle(THREAD, k); |
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982 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); |
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983 Universe::_out_of_memory_error_perm_gen = k_h->allocate_instance(CHECK_false); |
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984 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); |
0 | 985 Universe::_out_of_memory_error_gc_overhead_limit = |
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986 k_h->allocate_instance(CHECK_false); |
0 | 987 |
988 // Setup preallocated NullPointerException | |
989 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
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990 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); |
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991 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
0 | 992 // Setup preallocated ArithmeticException |
993 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
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994 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); |
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995 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
0 | 996 // Virtual Machine Error for when we get into a situation we can't resolve |
997 k = SystemDictionary::resolve_or_fail( | |
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998 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); |
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999 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); |
0 | 1000 if (!linked) { |
1001 tty->print_cr("Unable to link/verify VirtualMachineError class"); | |
1002 return false; // initialization failed | |
1003 } | |
1004 Universe::_virtual_machine_error_instance = | |
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1005 InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
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1006 |
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1007 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
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1008 |
0 | 1009 if (!DumpSharedSpaces) { |
1010 // These are the only Java fields that are currently set during shared space dumping. | |
1011 // We prefer to not handle this generally, so we always reinitialize these detail messages. | |
1012 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); | |
1013 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); | |
1014 | |
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1015 msg = java_lang_String::create_from_str("Metadata space", CHECK_false); |
0 | 1016 java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg()); |
1017 | |
1018 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); | |
1019 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); | |
1020 | |
1021 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); | |
1022 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); | |
1023 | |
1024 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); | |
1025 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); | |
1026 | |
1027 // Setup the array of errors that have preallocated backtrace | |
1028 k = Universe::_out_of_memory_error_java_heap->klass(); | |
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1029 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); |
0 | 1030 k_h = instanceKlassHandle(THREAD, k); |
1031 | |
1032 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; | |
1033 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); | |
1034 for (int i=0; i<len; i++) { | |
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1035 oop err = k_h->allocate_instance(CHECK_false); |
0 | 1036 Handle err_h = Handle(THREAD, err); |
1037 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); | |
1038 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); | |
1039 } | |
1040 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; | |
1041 } | |
1042 | |
1043 | |
1044 // Setup static method for registering finalizers | |
1045 // The finalizer klass must be linked before looking up the method, in | |
1046 // case it needs to get rewritten. | |
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1047 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); |
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1048 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( |
0 | 1049 vmSymbols::register_method_name(), |
1050 vmSymbols::register_method_signature()); | |
1051 if (m == NULL || !m->is_static()) { | |
1052 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
1053 "java.lang.ref.Finalizer.register", false); | |
1054 } | |
1055 Universe::_finalizer_register_cache->init( | |
1142 | 1056 SystemDictionary::Finalizer_klass(), m, CHECK_false); |
0 | 1057 |
1058 // Resolve on first use and initialize class. | |
1059 // Note: No race-condition here, since a resolve will always return the same result | |
1060 | |
1061 // Setup method for security checks | |
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1062 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_reflect_Method(), true, CHECK_false); |
0 | 1063 k_h = instanceKlassHandle(THREAD, k); |
1064 k_h->link_class(CHECK_false); | |
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1065 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_object_array_object_signature()); |
0 | 1066 if (m == NULL || m->is_static()) { |
1067 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
1068 "java.lang.reflect.Method.invoke", false); | |
1069 } | |
1070 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false); | |
1071 | |
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1072 // Setup method for registering loaded classes in class loader vector |
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1073 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); |
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1074 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); |
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1075 if (m == NULL || m->is_static()) { |
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1076 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), |
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1077 "java.lang.ClassLoader.addClass", false); |
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1078 } |
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1079 Universe::_loader_addClass_cache->init( |
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1080 SystemDictionary::ClassLoader_klass(), m, CHECK_false); |
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1081 |
0 | 1082 // The folowing is initializing converter functions for serialization in |
1083 // JVM.cpp. If we clean up the StrictMath code above we may want to find | |
1084 // a better solution for this as well. | |
1085 initialize_converter_functions(); | |
1086 | |
1087 // This needs to be done before the first scavenge/gc, since | |
1088 // it's an input to soft ref clearing policy. | |
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1089 { |
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1090 MutexLocker x(Heap_lock); |
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1091 Universe::update_heap_info_at_gc(); |
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1092 } |
0 | 1093 |
1094 // ("weak") refs processing infrastructure initialization | |
1095 Universe::heap()->post_initialize(); | |
1096 | |
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1097 // Initialize performance counters for metaspaces |
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1098 MetaspaceCounters::initialize_performance_counters(); |
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1099 |
0 | 1100 GC_locker::unlock(); // allow gc after bootstrapping |
1101 | |
1102 MemoryService::set_universe_heap(Universe::_collectedHeap); | |
1103 return true; | |
1104 } | |
1105 | |
1106 | |
1107 void Universe::compute_base_vtable_size() { | |
1108 _base_vtable_size = ClassLoader::compute_Object_vtable(); | |
1109 } | |
1110 | |
1111 | |
1112 // %%% The Universe::flush_foo methods belong in CodeCache. | |
1113 | |
1114 // Flushes compiled methods dependent on dependee. | |
1115 void Universe::flush_dependents_on(instanceKlassHandle dependee) { | |
1116 assert_lock_strong(Compile_lock); | |
1117 | |
1118 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
1119 | |
1120 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1121 // stopped dring the safepoint so CodeCache will be safe to update without | |
1122 // holding the CodeCache_lock. | |
1123 | |
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1124 KlassDepChange changes(dependee); |
0 | 1125 |
1126 // Compute the dependent nmethods | |
1127 if (CodeCache::mark_for_deoptimization(changes) > 0) { | |
1128 // At least one nmethod has been marked for deoptimization | |
1129 VM_Deoptimize op; | |
1130 VMThread::execute(&op); | |
1131 } | |
1132 } | |
1133 | |
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1134 // Flushes compiled methods dependent on a particular CallSite |
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1135 // instance when its target is different than the given MethodHandle. |
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1136 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) { |
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1137 assert_lock_strong(Compile_lock); |
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1138 |
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1139 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; |
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1140 |
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1141 // CodeCache can only be updated by a thread_in_VM and they will all be |
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1142 // stopped dring the safepoint so CodeCache will be safe to update without |
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1143 // holding the CodeCache_lock. |
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1144 |
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1145 CallSiteDepChange changes(call_site(), method_handle()); |
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1146 |
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1147 // Compute the dependent nmethods that have a reference to a |
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1148 // CallSite object. We use InstanceKlass::mark_dependent_nmethod |
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1149 // directly instead of CodeCache::mark_for_deoptimization because we |
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1150 // want dependents on the call site class only not all classes in |
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1151 // the ContextStream. |
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1152 int marked = 0; |
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1153 { |
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1154 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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1155 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass()); |
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1156 marked = call_site_klass->mark_dependent_nmethods(changes); |
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1157 } |
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1158 if (marked > 0) { |
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1159 // At least one nmethod has been marked for deoptimization |
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1160 VM_Deoptimize op; |
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1161 VMThread::execute(&op); |
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1162 } |
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1163 } |
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1164 |
0 | 1165 #ifdef HOTSWAP |
1166 // Flushes compiled methods dependent on dependee in the evolutionary sense | |
1167 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { | |
1168 // --- Compile_lock is not held. However we are at a safepoint. | |
1169 assert_locked_or_safepoint(Compile_lock); | |
1170 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
1171 | |
1172 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1173 // stopped dring the safepoint so CodeCache will be safe to update without | |
1174 // holding the CodeCache_lock. | |
1175 | |
1176 // Compute the dependent nmethods | |
1177 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { | |
1178 // At least one nmethod has been marked for deoptimization | |
1179 | |
1180 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
1181 // Stuff copied from VM_Deoptimize and modified slightly. | |
1182 | |
1183 // We do not want any GCs to happen while we are in the middle of this VM operation | |
1184 ResourceMark rm; | |
1185 DeoptimizationMarker dm; | |
1186 | |
1187 // Deoptimize all activations depending on marked nmethods | |
1188 Deoptimization::deoptimize_dependents(); | |
1189 | |
1190 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
1191 CodeCache::make_marked_nmethods_not_entrant(); | |
1192 } | |
1193 } | |
1194 #endif // HOTSWAP | |
1195 | |
1196 | |
1197 // Flushes compiled methods dependent on dependee | |
1198 void Universe::flush_dependents_on_method(methodHandle m_h) { | |
1199 // --- Compile_lock is not held. However we are at a safepoint. | |
1200 assert_locked_or_safepoint(Compile_lock); | |
1201 | |
1202 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1203 // stopped dring the safepoint so CodeCache will be safe to update without | |
1204 // holding the CodeCache_lock. | |
1205 | |
1206 // Compute the dependent nmethods | |
1207 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { | |
1208 // At least one nmethod has been marked for deoptimization | |
1209 | |
1210 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
1211 // Stuff copied from VM_Deoptimize and modified slightly. | |
1212 | |
1213 // We do not want any GCs to happen while we are in the middle of this VM operation | |
1214 ResourceMark rm; | |
1215 DeoptimizationMarker dm; | |
1216 | |
1217 // Deoptimize all activations depending on marked nmethods | |
1218 Deoptimization::deoptimize_dependents(); | |
1219 | |
1220 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
1221 CodeCache::make_marked_nmethods_not_entrant(); | |
1222 } | |
1223 } | |
1224 | |
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1225 void Universe::print() { |
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1226 print_on(gclog_or_tty); |
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1227 } |
0 | 1228 |
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1229 void Universe::print_on(outputStream* st, bool extended) { |
0 | 1230 st->print_cr("Heap"); |
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1231 if (!extended) { |
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1232 heap()->print_on(st); |
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1233 } else { |
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1234 heap()->print_extended_on(st); |
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1235 } |
0 | 1236 } |
1237 | |
1238 void Universe::print_heap_at_SIGBREAK() { | |
1239 if (PrintHeapAtSIGBREAK) { | |
1240 MutexLocker hl(Heap_lock); | |
1241 print_on(tty); | |
1242 tty->cr(); | |
1243 tty->flush(); | |
1244 } | |
1245 } | |
1246 | |
4944 | 1247 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { |
0 | 1248 st->print_cr("{Heap before GC invocations=%u (full %u):", |
1249 heap()->total_collections(), | |
1250 heap()->total_full_collections()); | |
4944 | 1251 if (!PrintHeapAtGCExtended || ignore_extended) { |
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1252 heap()->print_on(st); |
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1253 } else { |
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1254 heap()->print_extended_on(st); |
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1255 } |
0 | 1256 } |
1257 | |
4944 | 1258 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { |
0 | 1259 st->print_cr("Heap after GC invocations=%u (full %u):", |
1260 heap()->total_collections(), | |
1261 heap()->total_full_collections()); | |
4944 | 1262 if (!PrintHeapAtGCExtended || ignore_extended) { |
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1263 heap()->print_on(st); |
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1264 } else { |
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1265 heap()->print_extended_on(st); |
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1266 } |
0 | 1267 st->print_cr("}"); |
1268 } | |
1269 | |
6008 | 1270 void Universe::verify(bool silent, VerifyOption option) { |
0 | 1271 // The use of _verify_in_progress is a temporary work around for |
1272 // 6320749. Don't bother with a creating a class to set and clear | |
1273 // it since it is only used in this method and the control flow is | |
1274 // straight forward. | |
1275 _verify_in_progress = true; | |
1276 | |
1277 COMPILER2_PRESENT( | |
1278 assert(!DerivedPointerTable::is_active(), | |
1279 "DPT should not be active during verification " | |
1280 "(of thread stacks below)"); | |
1281 ) | |
1282 | |
1283 ResourceMark rm; | |
1284 HandleMark hm; // Handles created during verification can be zapped | |
1285 _verify_count++; | |
1286 | |
1287 if (!silent) gclog_or_tty->print("[Verifying "); | |
1288 if (!silent) gclog_or_tty->print("threads "); | |
1289 Threads::verify(); | |
6008 | 1290 heap()->verify(silent, option); |
0 | 1291 |
1292 if (!silent) gclog_or_tty->print("syms "); | |
1293 SymbolTable::verify(); | |
1294 if (!silent) gclog_or_tty->print("strs "); | |
1295 StringTable::verify(); | |
1296 { | |
1297 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
1298 if (!silent) gclog_or_tty->print("zone "); | |
1299 CodeCache::verify(); | |
1300 } | |
1301 if (!silent) gclog_or_tty->print("dict "); | |
1302 SystemDictionary::verify(); | |
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1303 #ifndef PRODUCT |
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1304 if (!silent) gclog_or_tty->print("cldg "); |
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1305 ClassLoaderDataGraph::verify(); |
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1306 #endif |
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1307 if (!silent) gclog_or_tty->print("metaspace chunks "); |
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1308 MetaspaceAux::verify_free_chunks(); |
0 | 1309 if (!silent) gclog_or_tty->print("hand "); |
1310 JNIHandles::verify(); | |
1311 if (!silent) gclog_or_tty->print("C-heap "); | |
1312 os::check_heap(); | |
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1313 if (!silent) gclog_or_tty->print("code cache "); |
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1314 CodeCache::verify_oops(); |
0 | 1315 if (!silent) gclog_or_tty->print_cr("]"); |
1316 | |
1317 _verify_in_progress = false; | |
1318 } | |
1319 | |
1320 // Oop verification (see MacroAssembler::verify_oop) | |
1321 | |
1322 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; | |
1323 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; | |
1324 | |
1325 | |
1326 static void calculate_verify_data(uintptr_t verify_data[2], | |
1327 HeapWord* low_boundary, | |
1328 HeapWord* high_boundary) { | |
1329 assert(low_boundary < high_boundary, "bad interval"); | |
1330 | |
1331 // decide which low-order bits we require to be clear: | |
1332 size_t alignSize = MinObjAlignmentInBytes; | |
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1333 size_t min_object_size = CollectedHeap::min_fill_size(); |
0 | 1334 |
1335 // make an inclusive limit: | |
1336 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; | |
1337 uintptr_t min = (uintptr_t)low_boundary; | |
1338 assert(min < max, "bad interval"); | |
1339 uintptr_t diff = max ^ min; | |
1340 | |
1341 // throw away enough low-order bits to make the diff vanish | |
1342 uintptr_t mask = (uintptr_t)(-1); | |
1343 while ((mask & diff) != 0) | |
1344 mask <<= 1; | |
1345 uintptr_t bits = (min & mask); | |
1346 assert(bits == (max & mask), "correct mask"); | |
1347 // check an intermediate value between min and max, just to make sure: | |
1348 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); | |
1349 | |
1350 // require address alignment, too: | |
1351 mask |= (alignSize - 1); | |
1352 | |
1353 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { | |
1354 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); | |
1355 } | |
1356 verify_data[0] = mask; | |
1357 verify_data[1] = bits; | |
1358 } | |
1359 | |
1360 | |
1361 // Oop verification (see MacroAssembler::verify_oop) | |
1362 #ifndef PRODUCT | |
1363 | |
1364 uintptr_t Universe::verify_oop_mask() { | |
1365 MemRegion m = heap()->reserved_region(); | |
1366 calculate_verify_data(_verify_oop_data, | |
1367 m.start(), | |
1368 m.end()); | |
1369 return _verify_oop_data[0]; | |
1370 } | |
1371 | |
1372 | |
1373 | |
1374 uintptr_t Universe::verify_oop_bits() { | |
1375 verify_oop_mask(); | |
1376 return _verify_oop_data[1]; | |
1377 } | |
1378 | |
1379 uintptr_t Universe::verify_mark_mask() { | |
1380 return markOopDesc::lock_mask_in_place; | |
1381 } | |
1382 | |
1383 uintptr_t Universe::verify_mark_bits() { | |
1384 intptr_t mask = verify_mark_mask(); | |
1385 intptr_t bits = (intptr_t)markOopDesc::prototype(); | |
1386 assert((bits & ~mask) == 0, "no stray header bits"); | |
1387 return bits; | |
1388 } | |
1389 #endif // PRODUCT | |
1390 | |
1391 | |
1392 void Universe::compute_verify_oop_data() { | |
1393 verify_oop_mask(); | |
1394 verify_oop_bits(); | |
1395 verify_mark_mask(); | |
1396 verify_mark_bits(); | |
1397 } | |
1398 | |
1399 | |
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1400 void CommonMethodOopCache::init(Klass* k, Method* m, TRAPS) { |
0 | 1401 if (!UseSharedSpaces) { |
1402 _klass = k; | |
1403 } | |
1404 #ifndef PRODUCT | |
1405 else { | |
1406 // sharing initilization should have already set up _klass | |
1407 assert(_klass != NULL, "just checking"); | |
1408 } | |
1409 #endif | |
1410 | |
1411 _method_idnum = m->method_idnum(); | |
1412 assert(_method_idnum >= 0, "sanity check"); | |
1413 } | |
1414 | |
1415 | |
1416 ActiveMethodOopsCache::~ActiveMethodOopsCache() { | |
1417 if (_prev_methods != NULL) { | |
1418 delete _prev_methods; | |
1419 _prev_methods = NULL; | |
1420 } | |
1421 } | |
1422 | |
1423 | |
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1424 void ActiveMethodOopsCache::add_previous_version(Method* const method) { |
0 | 1425 assert(Thread::current()->is_VM_thread(), |
1426 "only VMThread can add previous versions"); | |
1427 | |
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1428 // Only append the previous method if it is executing on the stack. |
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1429 if (method->on_stack()) { |
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1430 |
0 | 1431 if (_prev_methods == NULL) { |
1432 // This is the first previous version so make some space. | |
1433 // Start with 2 elements under the assumption that the class | |
1434 // won't be redefined much. | |
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1435 _prev_methods = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Method*>(2, true); |
0 | 1436 } |
1437 | |
1438 // RC_TRACE macro has an embedded ResourceMark | |
1439 RC_TRACE(0x00000100, | |
1440 ("add: %s(%s): adding prev version ref for cached method @%d", | |
1441 method->name()->as_C_string(), method->signature()->as_C_string(), | |
1442 _prev_methods->length())); | |
1443 | |
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1444 _prev_methods->append(method); |
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1445 } |
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1446 |
0 | 1447 |
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1448 // Since the caller is the VMThread and we are at a safepoint, this is a good |
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1449 // time to clear out unused method references. |
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1450 |
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1451 if (_prev_methods == NULL) return; |
0 | 1452 |
1453 for (int i = _prev_methods->length() - 1; i >= 0; i--) { | |
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1454 Method* method = _prev_methods->at(i); |
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1455 assert(method != NULL, "weak method ref was unexpectedly cleared"); |
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1456 |
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1457 if (!method->on_stack()) { |
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1458 // This method isn't running anymore so remove it |
0 | 1459 _prev_methods->remove_at(i); |
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1460 MetadataFactory::free_metadata(method->method_holder()->class_loader_data(), method); |
0 | 1461 } else { |
1462 // RC_TRACE macro has an embedded ResourceMark | |
1463 RC_TRACE(0x00000400, ("add: %s(%s): previous cached method @%d is alive", | |
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1464 method->name()->as_C_string(), method->signature()->as_C_string(), i)); |
0 | 1465 } |
1466 } | |
1467 } // end add_previous_version() | |
1468 | |
1469 | |
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1470 bool ActiveMethodOopsCache::is_same_method(Method* const method) const { |
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1471 InstanceKlass* ik = InstanceKlass::cast(klass()); |
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1472 Method* check_method = ik->method_with_idnum(method_idnum()); |
0 | 1473 assert(check_method != NULL, "sanity check"); |
1474 if (check_method == method) { | |
1475 // done with the easy case | |
1476 return true; | |
1477 } | |
1478 | |
1479 if (_prev_methods != NULL) { | |
1480 // The cached method has been redefined at least once so search | |
1481 // the previous versions for a match. | |
1482 for (int i = 0; i < _prev_methods->length(); i++) { | |
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1483 check_method = _prev_methods->at(i); |
0 | 1484 if (check_method == method) { |
1485 // a previous version matches | |
1486 return true; | |
1487 } | |
1488 } | |
1489 } | |
1490 | |
1491 // either no previous versions or no previous version matched | |
1492 return false; | |
1493 } | |
1494 | |
1495 | |
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1496 Method* LatestMethodOopCache::get_Method() { |
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1497 InstanceKlass* ik = InstanceKlass::cast(klass()); |
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1498 Method* m = ik->method_with_idnum(method_idnum()); |
0 | 1499 assert(m != NULL, "sanity check"); |
1500 return m; | |
1501 } | |
1502 | |
1503 | |
1504 #ifdef ASSERT | |
1505 // Release dummy object(s) at bottom of heap | |
1506 bool Universe::release_fullgc_alot_dummy() { | |
1507 MutexLocker ml(FullGCALot_lock); | |
1508 if (_fullgc_alot_dummy_array != NULL) { | |
1509 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { | |
1510 // No more dummies to release, release entire array instead | |
1511 _fullgc_alot_dummy_array = NULL; | |
1512 return false; | |
1513 } | |
1514 if (!UseConcMarkSweepGC) { | |
1515 // Release dummy at bottom of old generation | |
1516 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
1517 } | |
1518 // Release dummy at bottom of permanent generation | |
1519 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
1520 } | |
1521 return true; | |
1522 } | |
1523 | |
1524 #endif // ASSERT |