Mercurial > hg > truffle
annotate src/share/vm/memory/universe.cpp @ 12355:cefad50507d8
Merge with hs25-b53
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Fri, 11 Oct 2013 10:38:03 +0200 |
| parents | 58fc8e2b7b6d da051ce490eb |
| children | 096c224171c4 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/classLoader.hpp" | |
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27 #include "classfile/classLoaderData.hpp" |
| 1972 | 28 #include "classfile/javaClasses.hpp" |
| 29 #include "classfile/symbolTable.hpp" | |
| 30 #include "classfile/systemDictionary.hpp" | |
| 31 #include "classfile/vmSymbols.hpp" | |
| 32 #include "code/codeCache.hpp" | |
| 33 #include "code/dependencies.hpp" | |
| 34 #include "gc_interface/collectedHeap.inline.hpp" | |
| 35 #include "interpreter/interpreter.hpp" | |
| 36 #include "memory/cardTableModRefBS.hpp" | |
| 37 #include "memory/gcLocker.inline.hpp" | |
| 38 #include "memory/genCollectedHeap.hpp" | |
| 39 #include "memory/genRemSet.hpp" | |
| 40 #include "memory/generation.hpp" | |
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41 #include "memory/metadataFactory.hpp" |
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42 #include "memory/metaspaceShared.hpp" |
| 1972 | 43 #include "memory/oopFactory.hpp" |
| 44 #include "memory/space.hpp" | |
| 45 #include "memory/universe.hpp" | |
| 46 #include "memory/universe.inline.hpp" | |
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47 #include "oops/constantPool.hpp" |
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48 #include "oops/instanceClassLoaderKlass.hpp" |
| 1972 | 49 #include "oops/instanceKlass.hpp" |
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50 #include "oops/instanceMirrorKlass.hpp" |
| 1972 | 51 #include "oops/instanceRefKlass.hpp" |
| 52 #include "oops/oop.inline.hpp" | |
| 53 #include "oops/typeArrayKlass.hpp" | |
| 54 #include "prims/jvmtiRedefineClassesTrace.hpp" | |
| 55 #include "runtime/arguments.hpp" | |
| 56 #include "runtime/deoptimization.hpp" | |
| 57 #include "runtime/fprofiler.hpp" | |
| 58 #include "runtime/handles.inline.hpp" | |
| 59 #include "runtime/init.hpp" | |
| 60 #include "runtime/java.hpp" | |
| 61 #include "runtime/javaCalls.hpp" | |
| 62 #include "runtime/sharedRuntime.hpp" | |
| 63 #include "runtime/synchronizer.hpp" | |
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64 #include "runtime/thread.inline.hpp" |
| 1972 | 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" | |
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72 #include "utilities/macros.hpp" |
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73 #if INCLUDE_ALL_GCS |
| 1972 | 74 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" |
| 75 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp" | |
| 76 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 77 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
| 78 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
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79 #endif // INCLUDE_ALL_GCS |
| 0 | 80 |
| 81 // Known objects | |
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82 Klass* Universe::_boolArrayKlassObj = NULL; |
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83 Klass* Universe::_byteArrayKlassObj = NULL; |
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84 Klass* Universe::_charArrayKlassObj = NULL; |
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85 Klass* Universe::_intArrayKlassObj = NULL; |
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86 Klass* Universe::_shortArrayKlassObj = NULL; |
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87 Klass* Universe::_longArrayKlassObj = NULL; |
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88 Klass* Universe::_singleArrayKlassObj = NULL; |
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89 Klass* Universe::_doubleArrayKlassObj = NULL; |
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90 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; |
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91 Klass* Universe::_objectArrayKlassObj = NULL; |
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92 oop Universe::_int_mirror = NULL; |
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93 oop Universe::_float_mirror = NULL; |
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94 oop Universe::_double_mirror = NULL; |
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95 oop Universe::_byte_mirror = NULL; |
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96 oop Universe::_bool_mirror = NULL; |
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97 oop Universe::_char_mirror = NULL; |
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98 oop Universe::_long_mirror = NULL; |
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99 oop Universe::_short_mirror = NULL; |
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100 oop Universe::_void_mirror = NULL; |
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101 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; |
| 0 | 102 oop Universe::_main_thread_group = NULL; |
| 103 oop Universe::_system_thread_group = NULL; | |
| 104 objArrayOop Universe::_the_empty_class_klass_array = NULL; | |
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105 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; |
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106 oop Universe::_the_null_string = NULL; |
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107 oop Universe::_the_min_jint_string = NULL; |
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108 LatestMethodCache* Universe::_finalizer_register_cache = NULL; |
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109 LatestMethodCache* Universe::_loader_addClass_cache = NULL; |
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110 LatestMethodCache* Universe::_pd_implies_cache = NULL; |
| 0 | 111 oop Universe::_out_of_memory_error_java_heap = NULL; |
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112 oop Universe::_out_of_memory_error_metaspace = NULL; |
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113 oop Universe::_out_of_memory_error_class_metaspace = NULL; |
| 0 | 114 oop Universe::_out_of_memory_error_array_size = NULL; |
| 115 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; | |
| 116 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; | |
| 117 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; | |
| 118 bool Universe::_verify_in_progress = false; | |
| 119 oop Universe::_null_ptr_exception_instance = NULL; | |
| 120 oop Universe::_arithmetic_exception_instance = NULL; | |
| 121 oop Universe::_virtual_machine_error_instance = NULL; | |
| 122 oop Universe::_vm_exception = NULL; | |
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123 Array<int>* Universe::_the_empty_int_array = NULL; |
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124 Array<u2>* Universe::_the_empty_short_array = NULL; |
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125 Array<Klass*>* Universe::_the_empty_klass_array = NULL; |
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126 Array<Method*>* Universe::_the_empty_method_array = NULL; |
| 0 | 127 |
| 128 // These variables are guarded by FullGCALot_lock. | |
| 129 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) | |
| 130 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) | |
| 131 | |
| 132 // Heap | |
| 133 int Universe::_verify_count = 0; | |
| 134 | |
| 135 int Universe::_base_vtable_size = 0; | |
| 136 bool Universe::_bootstrapping = false; | |
| 137 bool Universe::_fully_initialized = false; | |
| 138 | |
| 139 size_t Universe::_heap_capacity_at_last_gc; | |
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140 size_t Universe::_heap_used_at_last_gc = 0; |
| 0 | 141 |
| 142 CollectedHeap* Universe::_collectedHeap = NULL; | |
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143 |
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144 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; |
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145 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; |
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146 address Universe::_narrow_ptrs_base; |
| 0 | 147 |
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148 void Universe::basic_type_classes_do(void f(Klass*)) { |
| 0 | 149 f(boolArrayKlassObj()); |
| 150 f(byteArrayKlassObj()); | |
| 151 f(charArrayKlassObj()); | |
| 152 f(intArrayKlassObj()); | |
| 153 f(shortArrayKlassObj()); | |
| 154 f(longArrayKlassObj()); | |
| 155 f(singleArrayKlassObj()); | |
| 156 f(doubleArrayKlassObj()); | |
| 157 } | |
| 158 | |
| 159 void Universe::oops_do(OopClosure* f, bool do_all) { | |
| 160 | |
| 161 f->do_oop((oop*) &_int_mirror); | |
| 162 f->do_oop((oop*) &_float_mirror); | |
| 163 f->do_oop((oop*) &_double_mirror); | |
| 164 f->do_oop((oop*) &_byte_mirror); | |
| 165 f->do_oop((oop*) &_bool_mirror); | |
| 166 f->do_oop((oop*) &_char_mirror); | |
| 167 f->do_oop((oop*) &_long_mirror); | |
| 168 f->do_oop((oop*) &_short_mirror); | |
| 169 f->do_oop((oop*) &_void_mirror); | |
| 170 | |
| 171 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
| 172 f->do_oop((oop*) &_mirrors[i]); | |
| 173 } | |
| 174 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); | |
| 175 | |
| 176 f->do_oop((oop*)&_the_empty_class_klass_array); | |
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177 f->do_oop((oop*)&_the_null_string); |
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178 f->do_oop((oop*)&_the_min_jint_string); |
| 0 | 179 f->do_oop((oop*)&_out_of_memory_error_java_heap); |
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180 f->do_oop((oop*)&_out_of_memory_error_metaspace); |
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181 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); |
| 0 | 182 f->do_oop((oop*)&_out_of_memory_error_array_size); |
| 183 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); | |
| 184 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); | |
| 185 f->do_oop((oop*)&_null_ptr_exception_instance); | |
| 186 f->do_oop((oop*)&_arithmetic_exception_instance); | |
| 187 f->do_oop((oop*)&_virtual_machine_error_instance); | |
| 188 f->do_oop((oop*)&_main_thread_group); | |
| 189 f->do_oop((oop*)&_system_thread_group); | |
| 190 f->do_oop((oop*)&_vm_exception); | |
| 191 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) | |
| 192 } | |
| 193 | |
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194 // Serialize metadata in and out of CDS archive, not oops. |
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195 void Universe::serialize(SerializeClosure* f, bool do_all) { |
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196 |
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197 f->do_ptr((void**)&_boolArrayKlassObj); |
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198 f->do_ptr((void**)&_byteArrayKlassObj); |
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199 f->do_ptr((void**)&_charArrayKlassObj); |
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200 f->do_ptr((void**)&_intArrayKlassObj); |
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201 f->do_ptr((void**)&_shortArrayKlassObj); |
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202 f->do_ptr((void**)&_longArrayKlassObj); |
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203 f->do_ptr((void**)&_singleArrayKlassObj); |
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204 f->do_ptr((void**)&_doubleArrayKlassObj); |
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205 f->do_ptr((void**)&_objectArrayKlassObj); |
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206 |
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207 { |
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208 for (int i = 0; i < T_VOID+1; i++) { |
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209 if (_typeArrayKlassObjs[i] != NULL) { |
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210 assert(i >= T_BOOLEAN, "checking"); |
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211 f->do_ptr((void**)&_typeArrayKlassObjs[i]); |
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212 } else if (do_all) { |
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213 f->do_ptr((void**)&_typeArrayKlassObjs[i]); |
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214 } |
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215 } |
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216 } |
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217 |
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218 f->do_ptr((void**)&_the_array_interfaces_array); |
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219 f->do_ptr((void**)&_the_empty_int_array); |
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220 f->do_ptr((void**)&_the_empty_short_array); |
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221 f->do_ptr((void**)&_the_empty_method_array); |
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222 f->do_ptr((void**)&_the_empty_klass_array); |
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223 _finalizer_register_cache->serialize(f); |
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224 _loader_addClass_cache->serialize(f); |
| 11010 | 225 _pd_implies_cache->serialize(f); |
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226 } |
| 0 | 227 |
| 228 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { | |
| 229 if (size < alignment || size % alignment != 0) { | |
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230 vm_exit_during_initialization( |
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231 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); |
| 0 | 232 } |
| 233 } | |
| 234 | |
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235 void initialize_basic_type_klass(Klass* k, TRAPS) { |
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236 Klass* ok = SystemDictionary::Object_klass(); |
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237 if (UseSharedSpaces) { |
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238 assert(k->super() == ok, "u3"); |
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239 k->restore_unshareable_info(CHECK); |
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240 } else { |
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241 k->initialize_supers(ok, CHECK); |
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242 } |
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243 k->append_to_sibling_list(); |
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244 } |
| 0 | 245 |
| 246 void Universe::genesis(TRAPS) { | |
| 247 ResourceMark rm; | |
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248 |
| 0 | 249 { FlagSetting fs(_bootstrapping, true); |
| 250 | |
| 251 { MutexLocker mc(Compile_lock); | |
| 252 | |
| 253 // determine base vtable size; without that we cannot create the array klasses | |
| 254 compute_base_vtable_size(); | |
| 255 | |
| 256 if (!UseSharedSpaces) { | |
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257 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); |
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258 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); |
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259 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); |
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260 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); |
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261 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); |
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262 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); |
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263 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); |
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264 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); |
| 0 | 265 |
| 266 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; | |
| 267 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; | |
| 268 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; | |
| 269 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; | |
| 270 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; | |
| 271 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; | |
| 272 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; | |
| 273 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; | |
| 274 | |
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275 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); |
| 0 | 276 |
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277 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); |
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278 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); |
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279 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); |
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280 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); |
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281 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); |
| 0 | 282 } |
| 283 } | |
| 284 | |
| 285 vmSymbols::initialize(CHECK); | |
| 286 | |
| 287 SystemDictionary::initialize(CHECK); | |
| 288 | |
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289 Klass* ok = SystemDictionary::Object_klass(); |
| 0 | 290 |
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291 _the_null_string = StringTable::intern("null", CHECK); |
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292 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); |
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293 |
| 0 | 294 if (UseSharedSpaces) { |
| 295 // Verify shared interfaces array. | |
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296 assert(_the_array_interfaces_array->at(0) == |
| 1142 | 297 SystemDictionary::Cloneable_klass(), "u3"); |
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298 assert(_the_array_interfaces_array->at(1) == |
| 1142 | 299 SystemDictionary::Serializable_klass(), "u3"); |
| 0 | 300 } else { |
| 301 // Set up shared interfaces array. (Do this before supers are set up.) | |
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302 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); |
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303 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); |
| 0 | 304 } |
| 305 | |
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306 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); |
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307 initialize_basic_type_klass(charArrayKlassObj(), CHECK); |
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308 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); |
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309 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); |
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310 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); |
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311 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); |
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312 initialize_basic_type_klass(intArrayKlassObj(), CHECK); |
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313 initialize_basic_type_klass(longArrayKlassObj(), CHECK); |
| 0 | 314 } // end of core bootstrapping |
| 315 | |
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316 // Maybe this could be lifted up now that object array can be initialized |
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317 // during the bootstrapping. |
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318 |
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319 // OLD |
| 0 | 320 // Initialize _objectArrayKlass after core bootstraping to make |
| 321 // sure the super class is set up properly for _objectArrayKlass. | |
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322 // --- |
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323 // NEW |
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324 // Since some of the old system object arrays have been converted to |
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325 // ordinary object arrays, _objectArrayKlass will be loaded when |
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326 // SystemDictionary::initialize(CHECK); is run. See the extra check |
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327 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. |
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328 _objectArrayKlassObj = InstanceKlass:: |
| 1142 | 329 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); |
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330 // OLD |
| 0 | 331 // Add the class to the class hierarchy manually to make sure that |
| 332 // its vtable is initialized after core bootstrapping is completed. | |
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333 // --- |
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334 // New |
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335 // Have already been initialized. |
| 6983 | 336 _objectArrayKlassObj->append_to_sibling_list(); |
| 0 | 337 |
| 338 // Compute is_jdk version flags. | |
| 339 // Only 1.3 or later has the java.lang.Shutdown class. | |
| 340 // Only 1.4 or later has the java.lang.CharSequence interface. | |
| 341 // Only 1.5 or later has the java.lang.management.MemoryUsage class. | |
| 242 | 342 if (JDK_Version::is_partially_initialized()) { |
| 343 uint8_t jdk_version; | |
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344 Klass* k = SystemDictionary::resolve_or_null( |
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345 vmSymbols::java_lang_management_MemoryUsage(), THREAD); |
| 0 | 346 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
| 347 if (k == NULL) { | |
| 242 | 348 k = SystemDictionary::resolve_or_null( |
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349 vmSymbols::java_lang_CharSequence(), THREAD); |
| 0 | 350 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
| 351 if (k == NULL) { | |
| 242 | 352 k = SystemDictionary::resolve_or_null( |
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353 vmSymbols::java_lang_Shutdown(), THREAD); |
| 0 | 354 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
| 355 if (k == NULL) { | |
| 242 | 356 jdk_version = 2; |
| 0 | 357 } else { |
| 242 | 358 jdk_version = 3; |
| 0 | 359 } |
| 360 } else { | |
| 242 | 361 jdk_version = 4; |
| 0 | 362 } |
| 363 } else { | |
| 242 | 364 jdk_version = 5; |
| 0 | 365 } |
| 242 | 366 JDK_Version::fully_initialize(jdk_version); |
| 0 | 367 } |
| 368 | |
| 369 #ifdef ASSERT | |
| 370 if (FullGCALot) { | |
| 371 // Allocate an array of dummy objects. | |
| 372 // We'd like these to be at the bottom of the old generation, | |
| 373 // so that when we free one and then collect, | |
| 374 // (almost) the whole heap moves | |
| 375 // and we find out if we actually update all the oops correctly. | |
| 376 // But we can't allocate directly in the old generation, | |
| 377 // so we allocate wherever, and hope that the first collection | |
| 378 // moves these objects to the bottom of the old generation. | |
| 379 // We can allocate directly in the permanent generation, so we do. | |
| 380 int size; | |
| 381 if (UseConcMarkSweepGC) { | |
| 382 warning("Using +FullGCALot with concurrent mark sweep gc " | |
| 383 "will not force all objects to relocate"); | |
| 384 size = FullGCALotDummies; | |
| 385 } else { | |
| 386 size = FullGCALotDummies * 2; | |
| 387 } | |
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388 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); |
| 0 | 389 objArrayHandle dummy_array(THREAD, naked_array); |
| 390 int i = 0; | |
| 391 while (i < size) { | |
| 392 // Allocate dummy in old generation | |
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393 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); |
| 0 | 394 dummy_array->obj_at_put(i++, dummy); |
| 395 } | |
| 396 { | |
| 397 // Only modify the global variable inside the mutex. | |
| 398 // If we had a race to here, the other dummy_array instances | |
| 399 // and their elements just get dropped on the floor, which is fine. | |
| 400 MutexLocker ml(FullGCALot_lock); | |
| 401 if (_fullgc_alot_dummy_array == NULL) { | |
| 402 _fullgc_alot_dummy_array = dummy_array(); | |
| 403 } | |
| 404 } | |
| 405 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); | |
| 406 } | |
| 407 #endif | |
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408 |
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409 // Initialize dependency array for null class loader |
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410 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); |
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411 |
| 0 | 412 } |
| 413 | |
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414 // CDS support for patching vtables in metadata in the shared archive. |
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415 // All types inherited from Metadata have vtables, but not types inherited |
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416 // from MetaspaceObj, because the latter does not have virtual functions. |
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417 // If the metadata type has a vtable, it cannot be shared in the read-only |
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418 // section of the CDS archive, because the vtable pointer is patched. |
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419 static inline void add_vtable(void** list, int* n, void* o, int count) { |
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420 guarantee((*n) < count, "vtable list too small"); |
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421 void* vtable = dereference_vptr(o); |
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422 assert(*(void**)(vtable) != NULL, "invalid vtable"); |
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423 list[(*n)++] = vtable; |
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424 } |
| 0 | 425 |
| 426 void Universe::init_self_patching_vtbl_list(void** list, int count) { | |
| 427 int n = 0; | |
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428 { InstanceKlass o; add_vtable(list, &n, &o, count); } |
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429 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } |
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430 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } |
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431 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } |
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432 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } |
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433 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } |
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434 { Method o; add_vtable(list, &n, &o, count); } |
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435 { ConstantPool o; add_vtable(list, &n, &o, count); } |
| 0 | 436 } |
| 437 | |
| 438 void Universe::initialize_basic_type_mirrors(TRAPS) { | |
| 439 assert(_int_mirror==NULL, "basic type mirrors already initialized"); | |
| 440 _int_mirror = | |
| 441 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); | |
| 442 _float_mirror = | |
| 443 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); | |
| 444 _double_mirror = | |
| 445 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); | |
| 446 _byte_mirror = | |
| 447 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); | |
| 448 _bool_mirror = | |
| 449 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); | |
| 450 _char_mirror = | |
| 451 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); | |
| 452 _long_mirror = | |
| 453 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); | |
| 454 _short_mirror = | |
| 455 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); | |
| 456 _void_mirror = | |
| 457 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); | |
| 458 | |
| 459 _mirrors[T_INT] = _int_mirror; | |
| 460 _mirrors[T_FLOAT] = _float_mirror; | |
| 461 _mirrors[T_DOUBLE] = _double_mirror; | |
| 462 _mirrors[T_BYTE] = _byte_mirror; | |
| 463 _mirrors[T_BOOLEAN] = _bool_mirror; | |
| 464 _mirrors[T_CHAR] = _char_mirror; | |
| 465 _mirrors[T_LONG] = _long_mirror; | |
| 466 _mirrors[T_SHORT] = _short_mirror; | |
| 467 _mirrors[T_VOID] = _void_mirror; | |
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468 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); |
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469 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); |
| 0 | 470 } |
| 471 | |
| 472 void Universe::fixup_mirrors(TRAPS) { | |
| 473 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, | |
| 474 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply | |
| 475 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note | |
| 476 // that the number of objects allocated at this point is very small. | |
| 1142 | 477 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); |
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478 HandleMark hm(THREAD); |
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479 // Cache the start of the static fields |
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480 InstanceMirrorKlass::init_offset_of_static_fields(); |
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481 |
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482 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); |
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483 int list_length = list->length(); |
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484 for (int i = 0; i < list_length; i++) { |
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485 Klass* k = list->at(i); |
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486 assert(k->is_klass(), "List should only hold classes"); |
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487 EXCEPTION_MARK; |
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488 KlassHandle kh(THREAD, k); |
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489 java_lang_Class::fixup_mirror(kh, CATCH); |
| 0 | 490 } |
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491 delete java_lang_Class::fixup_mirror_list(); |
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492 java_lang_Class::set_fixup_mirror_list(NULL); |
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493 } |
| 0 | 494 |
| 495 static bool has_run_finalizers_on_exit = false; | |
| 496 | |
| 497 void Universe::run_finalizers_on_exit() { | |
| 498 if (has_run_finalizers_on_exit) return; | |
| 499 has_run_finalizers_on_exit = true; | |
| 500 | |
| 501 // Called on VM exit. This ought to be run in a separate thread. | |
| 502 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); | |
| 503 { | |
| 504 PRESERVE_EXCEPTION_MARK; | |
| 1142 | 505 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); |
| 0 | 506 JavaValue result(T_VOID); |
| 507 JavaCalls::call_static( | |
| 508 &result, | |
| 509 finalizer_klass, | |
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510 vmSymbols::run_finalizers_on_exit_name(), |
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511 vmSymbols::void_method_signature(), |
| 0 | 512 THREAD |
| 513 ); | |
| 514 // Ignore any pending exceptions | |
| 515 CLEAR_PENDING_EXCEPTION; | |
| 516 } | |
| 517 } | |
| 518 | |
| 519 | |
| 520 // initialize_vtable could cause gc if | |
| 521 // 1) we specified true to initialize_vtable and | |
| 522 // 2) this ran after gc was enabled | |
| 523 // In case those ever change we use handles for oops | |
| 524 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { | |
| 525 // init vtable of k and all subclasses | |
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526 Klass* ko = k_h(); |
| 0 | 527 klassVtable* vt = ko->vtable(); |
| 528 if (vt) vt->initialize_vtable(false, CHECK); | |
| 529 if (ko->oop_is_instance()) { | |
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530 InstanceKlass* ik = (InstanceKlass*)ko; |
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531 for (KlassHandle s_h(THREAD, ik->subklass()); |
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532 s_h() != NULL; |
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533 s_h = KlassHandle(THREAD, s_h()->next_sibling())) { |
| 0 | 534 reinitialize_vtable_of(s_h, CHECK); |
| 535 } | |
| 536 } | |
| 537 } | |
| 538 | |
| 539 | |
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540 void initialize_itable_for_klass(Klass* k, TRAPS) { |
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541 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); |
| 0 | 542 } |
| 543 | |
| 544 | |
| 545 void Universe::reinitialize_itables(TRAPS) { | |
| 546 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); | |
| 547 | |
| 548 } | |
| 549 | |
| 550 | |
| 551 bool Universe::on_page_boundary(void* addr) { | |
| 552 return ((uintptr_t) addr) % os::vm_page_size() == 0; | |
| 553 } | |
| 554 | |
| 555 | |
| 556 bool Universe::should_fill_in_stack_trace(Handle throwable) { | |
| 557 // never attempt to fill in the stack trace of preallocated errors that do not have | |
| 558 // backtrace. These errors are kept alive forever and may be "re-used" when all | |
| 559 // preallocated errors with backtrace have been consumed. Also need to avoid | |
| 560 // a potential loop which could happen if an out of memory occurs when attempting | |
| 561 // to allocate the backtrace. | |
| 562 return ((throwable() != Universe::_out_of_memory_error_java_heap) && | |
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563 (throwable() != Universe::_out_of_memory_error_metaspace) && |
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564 (throwable() != Universe::_out_of_memory_error_class_metaspace) && |
| 0 | 565 (throwable() != Universe::_out_of_memory_error_array_size) && |
| 566 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); | |
| 567 } | |
| 568 | |
| 569 | |
| 570 oop Universe::gen_out_of_memory_error(oop default_err) { | |
| 571 // generate an out of memory error: | |
| 572 // - if there is a preallocated error with backtrace available then return it wth | |
| 573 // a filled in stack trace. | |
| 574 // - if there are no preallocated errors with backtrace available then return | |
| 575 // an error without backtrace. | |
| 576 int next; | |
| 577 if (_preallocated_out_of_memory_error_avail_count > 0) { | |
| 578 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); | |
| 579 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); | |
| 580 } else { | |
| 581 next = -1; | |
| 582 } | |
| 583 if (next < 0) { | |
| 584 // all preallocated errors have been used. | |
| 585 // return default | |
| 586 return default_err; | |
| 587 } else { | |
| 588 // get the error object at the slot and set set it to NULL so that the | |
| 589 // array isn't keeping it alive anymore. | |
| 590 oop exc = preallocated_out_of_memory_errors()->obj_at(next); | |
| 591 assert(exc != NULL, "slot has been used already"); | |
| 592 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); | |
| 593 | |
| 594 // use the message from the default error | |
| 595 oop msg = java_lang_Throwable::message(default_err); | |
| 596 assert(msg != NULL, "no message"); | |
| 597 java_lang_Throwable::set_message(exc, msg); | |
| 598 | |
| 599 // populate the stack trace and return it. | |
| 600 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); | |
| 601 return exc; | |
| 602 } | |
| 603 } | |
| 604 | |
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605 intptr_t Universe::_non_oop_bits = 0; |
| 0 | 606 |
| 607 void* Universe::non_oop_word() { | |
| 608 // Neither the high bits nor the low bits of this value is allowed | |
| 609 // to look like (respectively) the high or low bits of a real oop. | |
| 610 // | |
| 611 // High and low are CPU-specific notions, but low always includes | |
| 612 // the low-order bit. Since oops are always aligned at least mod 4, | |
| 613 // setting the low-order bit will ensure that the low half of the | |
| 614 // word will never look like that of a real oop. | |
| 615 // | |
| 616 // Using the OS-supplied non-memory-address word (usually 0 or -1) | |
| 617 // will take care of the high bits, however many there are. | |
| 618 | |
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619 if (_non_oop_bits == 0) { |
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620 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; |
| 0 | 621 } |
| 622 | |
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623 return (void*)_non_oop_bits; |
| 0 | 624 } |
| 625 | |
| 626 jint universe_init() { | |
| 627 assert(!Universe::_fully_initialized, "called after initialize_vtables"); | |
| 628 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), | |
| 629 "LogHeapWordSize is incorrect."); | |
| 630 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); | |
| 631 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, | |
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632 "oop size is not not a multiple of HeapWord size"); |
| 0 | 633 TraceTime timer("Genesis", TraceStartupTime); |
| 634 GC_locker::lock(); // do not allow gc during bootstrapping | |
| 635 JavaClasses::compute_hard_coded_offsets(); | |
| 636 | |
| 637 jint status = Universe::initialize_heap(); | |
| 638 if (status != JNI_OK) { | |
| 639 return status; | |
| 640 } | |
| 641 | |
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642 Metaspace::global_initialize(); |
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643 |
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644 // Create memory for metadata. Must be after initializing heap for |
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645 // DumpSharedSpaces. |
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646 ClassLoaderData::init_null_class_loader_data(); |
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647 |
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648 // We have a heap so create the Method* caches before |
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649 // Metaspace::initialize_shared_spaces() tries to populate them. |
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650 Universe::_finalizer_register_cache = new LatestMethodCache(); |
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651 Universe::_loader_addClass_cache = new LatestMethodCache(); |
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652 Universe::_pd_implies_cache = new LatestMethodCache(); |
| 0 | 653 |
| 654 if (UseSharedSpaces) { | |
| 655 // Read the data structures supporting the shared spaces (shared | |
| 656 // system dictionary, symbol table, etc.). After that, access to | |
| 657 // the file (other than the mapped regions) is no longer needed, and | |
| 658 // the file is closed. Closing the file does not affect the | |
| 659 // currently mapped regions. | |
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660 MetaspaceShared::initialize_shared_spaces(); |
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661 StringTable::create_table(); |
| 0 | 662 } else { |
| 663 SymbolTable::create_table(); | |
| 664 StringTable::create_table(); | |
| 665 ClassLoader::create_package_info_table(); | |
| 666 } | |
| 667 | |
| 668 return JNI_OK; | |
| 669 } | |
| 670 | |
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671 // Choose the heap base address and oop encoding mode |
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672 // when compressed oops are used: |
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673 // Unscaled - Use 32-bits oops without encoding when |
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674 // NarrowOopHeapBaseMin + heap_size < 4Gb |
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675 // ZeroBased - Use zero based compressed oops with encoding when |
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676 // NarrowOopHeapBaseMin + heap_size < 32Gb |
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677 // HeapBased - Use compressed oops with heap base + encoding. |
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678 |
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679 // 4Gb |
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680 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); |
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681 // 32Gb |
|
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682 // OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes; |
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683 |
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684 char* Universe::preferred_heap_base(size_t heap_size, size_t alignment, NARROW_OOP_MODE mode) { |
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685 assert(is_size_aligned((size_t)OopEncodingHeapMax, alignment), "Must be"); |
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686 assert(is_size_aligned((size_t)NarrowOopHeapMax, alignment), "Must be"); |
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687 assert(is_size_aligned(heap_size, alignment), "Must be"); |
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688 |
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689 uintx heap_base_min_address_aligned = align_size_up(HeapBaseMinAddress, alignment); |
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690 |
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691 size_t base = 0; |
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692 #ifdef _LP64 |
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693 if (UseCompressedOops) { |
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694 assert(mode == UnscaledNarrowOop || |
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695 mode == ZeroBasedNarrowOop || |
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696 mode == HeapBasedNarrowOop, "mode is invalid"); |
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697 const size_t total_size = heap_size + heap_base_min_address_aligned; |
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698 // Return specified base for the first request. |
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699 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { |
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700 base = heap_base_min_address_aligned; |
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701 |
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702 // If the total size is small enough to allow UnscaledNarrowOop then |
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703 // just use UnscaledNarrowOop. |
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704 } else if ((total_size <= OopEncodingHeapMax) && (mode != HeapBasedNarrowOop)) { |
|
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705 if ((total_size <= NarrowOopHeapMax) && (mode == UnscaledNarrowOop) && |
|
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706 (Universe::narrow_oop_shift() == 0)) { |
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707 // Use 32-bits oops without encoding and |
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708 // place heap's top on the 4Gb boundary |
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709 base = (NarrowOopHeapMax - heap_size); |
|
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710 } else { |
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711 // Can't reserve with NarrowOopShift == 0 |
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712 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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713 if (mode == UnscaledNarrowOop || |
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714 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { |
|
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715 // Use zero based compressed oops with encoding and |
|
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716 // place heap's top on the 32Gb boundary in case |
|
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717 // total_size > 4Gb or failed to reserve below 4Gb. |
|
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718 base = (OopEncodingHeapMax - heap_size); |
|
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719 } |
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720 } |
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721 } else { |
|
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722 // UnscaledNarrowOop encoding didn't work, and no base was found for ZeroBasedOops or |
|
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723 // HeapBasedNarrowOop encoding was requested. So, can't reserve below 32Gb. |
|
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724 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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725 } |
|
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726 |
|
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727 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks |
|
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728 // used in ReservedHeapSpace() constructors. |
|
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729 // The final values will be set in initialize_heap() below. |
|
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730 if ((base != 0) && ((base + heap_size) <= OopEncodingHeapMax)) { |
|
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731 // Use zero based compressed oops |
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732 Universe::set_narrow_oop_base(NULL); |
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733 // Don't need guard page for implicit checks in indexed |
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734 // addressing mode with zero based Compressed Oops. |
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735 Universe::set_narrow_oop_use_implicit_null_checks(true); |
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736 } else { |
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737 // Set to a non-NULL value so the ReservedSpace ctor computes |
|
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738 // the correct no-access prefix. |
|
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739 // The final value will be set in initialize_heap() below. |
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740 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); |
|
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741 #ifdef _WIN64 |
|
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742 if (UseLargePages) { |
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743 // Cannot allocate guard pages for implicit checks in indexed |
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744 // addressing mode when large pages are specified on windows. |
|
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745 Universe::set_narrow_oop_use_implicit_null_checks(false); |
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746 } |
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747 #endif // _WIN64 |
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748 } |
|
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749 } |
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750 #endif |
|
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751 |
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752 assert(is_ptr_aligned((char*)base, alignment), "Must be"); |
|
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753 return (char*)base; // also return NULL (don't care) for 32-bit VM |
|
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754 } |
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755 |
| 0 | 756 jint Universe::initialize_heap() { |
| 757 | |
| 758 if (UseParallelGC) { | |
|
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759 #if INCLUDE_ALL_GCS |
| 0 | 760 Universe::_collectedHeap = new ParallelScavengeHeap(); |
|
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761 #else // INCLUDE_ALL_GCS |
|
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762 fatal("UseParallelGC not supported in this VM."); |
|
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763 #endif // INCLUDE_ALL_GCS |
| 0 | 764 |
|
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765 } else if (UseG1GC) { |
|
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766 #if INCLUDE_ALL_GCS |
| 4013 | 767 G1CollectorPolicy* g1p = new G1CollectorPolicy(); |
|
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768 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); |
|
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769 Universe::_collectedHeap = g1h; |
|
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770 #else // INCLUDE_ALL_GCS |
|
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771 fatal("UseG1GC not supported in java kernel vm."); |
|
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772 #endif // INCLUDE_ALL_GCS |
|
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773 |
| 0 | 774 } else { |
| 775 GenCollectorPolicy *gc_policy; | |
| 776 | |
| 777 if (UseSerialGC) { | |
| 778 gc_policy = new MarkSweepPolicy(); | |
| 779 } else if (UseConcMarkSweepGC) { | |
|
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780 #if INCLUDE_ALL_GCS |
| 0 | 781 if (UseAdaptiveSizePolicy) { |
| 782 gc_policy = new ASConcurrentMarkSweepPolicy(); | |
| 783 } else { | |
| 784 gc_policy = new ConcurrentMarkSweepPolicy(); | |
| 785 } | |
|
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786 #else // INCLUDE_ALL_GCS |
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787 fatal("UseConcMarkSweepGC not supported in this VM."); |
|
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788 #endif // INCLUDE_ALL_GCS |
| 0 | 789 } else { // default old generation |
| 790 gc_policy = new MarkSweepPolicy(); | |
| 791 } | |
| 792 | |
| 793 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); | |
| 794 } | |
| 795 | |
| 796 jint status = Universe::heap()->initialize(); | |
| 797 if (status != JNI_OK) { | |
| 798 return status; | |
| 799 } | |
|
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800 |
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801 #ifdef _LP64 |
|
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802 if (UseCompressedOops) { |
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803 // Subtract a page because something can get allocated at heap base. |
|
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804 // This also makes implicit null checking work, because the |
|
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805 // memory+1 page below heap_base needs to cause a signal. |
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806 // See needs_explicit_null_check. |
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807 // Only set the heap base for compressed oops because it indicates |
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808 // compressed oops for pstack code. |
| 2080 | 809 bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose); |
| 810 if (verbose) { | |
|
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811 tty->cr(); |
| 1963 | 812 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", |
| 813 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); | |
|
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814 } |
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815 if (((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax)) { |
|
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816 // Can't reserve heap below 32Gb. |
|
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817 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap() |
|
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818 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
| 2080 | 819 if (verbose) { |
| 10405 | 820 tty->print(", %s: "PTR_FORMAT, |
| 821 narrow_oop_mode_to_string(HeapBasedNarrowOop), | |
| 822 Universe::narrow_oop_base()); | |
|
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823 } |
|
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824 } else { |
|
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825 Universe::set_narrow_oop_base(0); |
| 2080 | 826 if (verbose) { |
| 10405 | 827 tty->print(", %s", narrow_oop_mode_to_string(ZeroBasedNarrowOop)); |
|
642
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828 } |
|
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829 #ifdef _WIN64 |
|
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830 if (!Universe::narrow_oop_use_implicit_null_checks()) { |
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831 // Don't need guard page for implicit checks in indexed addressing |
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832 // mode with zero based Compressed Oops. |
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833 Universe::set_narrow_oop_use_implicit_null_checks(true); |
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834 } |
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835 #endif // _WIN64 |
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836 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { |
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837 // Can't reserve heap below 4Gb. |
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838 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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839 } else { |
|
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840 Universe::set_narrow_oop_shift(0); |
| 2080 | 841 if (verbose) { |
| 10405 | 842 tty->print(", %s", narrow_oop_mode_to_string(UnscaledNarrowOop)); |
|
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843 } |
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844 } |
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845 } |
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846 |
| 2080 | 847 if (verbose) { |
|
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848 tty->cr(); |
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849 tty->cr(); |
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850 } |
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851 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); |
|
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852 } |
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853 // Universe::narrow_oop_base() is one page below the heap. |
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854 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - |
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855 os::vm_page_size()) || |
|
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856 Universe::narrow_oop_base() == NULL, "invalid value"); |
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857 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || |
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858 Universe::narrow_oop_shift() == 0, "invalid value"); |
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859 #endif |
| 0 | 860 |
| 861 // We will never reach the CATCH below since Exceptions::_throw will cause | |
| 862 // the VM to exit if an exception is thrown during initialization | |
| 863 | |
| 864 if (UseTLAB) { | |
| 865 assert(Universe::heap()->supports_tlab_allocation(), | |
| 866 "Should support thread-local allocation buffers"); | |
| 867 ThreadLocalAllocBuffer::startup_initialization(); | |
| 868 } | |
| 869 return JNI_OK; | |
| 870 } | |
| 871 | |
|
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872 |
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873 // Reserve the Java heap, which is now the same for all GCs. |
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874 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { |
|
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875 assert(alignment <= Arguments::conservative_max_heap_alignment(), |
|
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876 err_msg("actual alignment "SIZE_FORMAT" must be within maximum heap alignment "SIZE_FORMAT, |
|
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877 alignment, Arguments::conservative_max_heap_alignment())); |
|
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878 size_t total_reserved = align_size_up(heap_size, alignment); |
|
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879 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), |
|
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880 "heap size is too big for compressed oops"); |
|
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881 |
|
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882 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size()); |
|
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883 assert(!UseLargePages |
|
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884 || UseParallelGC |
|
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885 || use_large_pages, "Wrong alignment to use large pages"); |
|
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886 |
|
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887 char* addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::UnscaledNarrowOop); |
|
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888 |
|
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889 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, addr); |
|
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890 |
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891 if (UseCompressedOops) { |
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892 if (addr != NULL && !total_rs.is_reserved()) { |
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893 // Failed to reserve at specified address - the requested memory |
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894 // region is taken already, for example, by 'java' launcher. |
|
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895 // Try again to reserver heap higher. |
|
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896 addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::ZeroBasedNarrowOop); |
|
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897 |
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898 ReservedHeapSpace total_rs0(total_reserved, alignment, |
|
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899 use_large_pages, addr); |
|
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900 |
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901 if (addr != NULL && !total_rs0.is_reserved()) { |
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902 // Failed to reserve at specified address again - give up. |
|
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903 addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::HeapBasedNarrowOop); |
|
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904 assert(addr == NULL, ""); |
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905 |
|
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906 ReservedHeapSpace total_rs1(total_reserved, alignment, |
|
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907 use_large_pages, addr); |
|
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908 total_rs = total_rs1; |
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909 } else { |
|
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910 total_rs = total_rs0; |
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911 } |
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912 } |
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913 } |
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914 |
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915 if (!total_rs.is_reserved()) { |
|
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916 vm_exit_during_initialization(err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", total_reserved/K)); |
|
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917 return total_rs; |
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918 } |
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919 |
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920 if (UseCompressedOops) { |
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921 // Universe::initialize_heap() will reset this to NULL if unscaled |
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922 // or zero-based narrow oops are actually used. |
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923 address base = (address)(total_rs.base() - os::vm_page_size()); |
|
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924 Universe::set_narrow_oop_base(base); |
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925 } |
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926 return total_rs; |
|
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927 } |
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928 |
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929 |
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930 // It's the caller's responsibility to ensure glitch-freedom |
| 0 | 931 // (if required). |
| 932 void Universe::update_heap_info_at_gc() { | |
| 933 _heap_capacity_at_last_gc = heap()->capacity(); | |
| 934 _heap_used_at_last_gc = heap()->used(); | |
| 935 } | |
| 936 | |
| 937 | |
| 10405 | 938 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { |
| 939 switch (mode) { | |
| 940 case UnscaledNarrowOop: | |
| 941 return "32-bits Oops"; | |
| 942 case ZeroBasedNarrowOop: | |
| 943 return "zero based Compressed Oops"; | |
| 944 case HeapBasedNarrowOop: | |
| 945 return "Compressed Oops with base"; | |
| 946 } | |
| 947 | |
| 948 ShouldNotReachHere(); | |
| 949 return ""; | |
| 950 } | |
| 951 | |
| 952 | |
| 953 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { | |
| 954 if (narrow_oop_base() != 0) { | |
| 955 return HeapBasedNarrowOop; | |
| 956 } | |
| 957 | |
| 958 if (narrow_oop_shift() != 0) { | |
| 959 return ZeroBasedNarrowOop; | |
| 960 } | |
| 961 | |
| 962 return UnscaledNarrowOop; | |
| 963 } | |
| 964 | |
| 0 | 965 |
| 966 void universe2_init() { | |
| 967 EXCEPTION_MARK; | |
| 968 Universe::genesis(CATCH); | |
| 969 } | |
| 970 | |
| 971 | |
| 972 // This function is defined in JVM.cpp | |
| 973 extern void initialize_converter_functions(); | |
| 974 | |
| 975 bool universe_post_init() { | |
|
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976 assert(!is_init_completed(), "Error: initialization not yet completed!"); |
| 0 | 977 Universe::_fully_initialized = true; |
| 978 EXCEPTION_MARK; | |
| 979 { ResourceMark rm; | |
| 980 Interpreter::initialize(); // needed for interpreter entry points | |
| 981 if (!UseSharedSpaces) { | |
|
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982 HandleMark hm(THREAD); |
| 1142 | 983 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); |
| 0 | 984 Universe::reinitialize_vtable_of(ok_h, CHECK_false); |
| 985 Universe::reinitialize_itables(CHECK_false); | |
| 986 } | |
| 987 } | |
| 988 | |
|
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989 HandleMark hm(THREAD); |
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990 Klass* k; |
| 0 | 991 instanceKlassHandle k_h; |
| 992 // Setup preallocated empty java.lang.Class array | |
| 1142 | 993 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); |
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994 |
| 0 | 995 // Setup preallocated OutOfMemoryError errors |
|
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996 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); |
| 0 | 997 k_h = instanceKlassHandle(THREAD, k); |
|
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998 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); |
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999 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); |
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1000 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); |
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1001 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); |
| 0 | 1002 Universe::_out_of_memory_error_gc_overhead_limit = |
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1003 k_h->allocate_instance(CHECK_false); |
| 0 | 1004 |
| 1005 // Setup preallocated NullPointerException | |
| 1006 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
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1007 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); |
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1008 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
| 0 | 1009 // Setup preallocated ArithmeticException |
| 1010 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
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1011 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); |
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1012 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
| 0 | 1013 // Virtual Machine Error for when we get into a situation we can't resolve |
| 1014 k = SystemDictionary::resolve_or_fail( | |
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1015 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); |
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1016 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); |
| 0 | 1017 if (!linked) { |
| 1018 tty->print_cr("Unable to link/verify VirtualMachineError class"); | |
| 1019 return false; // initialization failed | |
| 1020 } | |
| 1021 Universe::_virtual_machine_error_instance = | |
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1022 InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
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1023 |
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1024 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
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1025 |
| 0 | 1026 if (!DumpSharedSpaces) { |
| 1027 // These are the only Java fields that are currently set during shared space dumping. | |
| 1028 // We prefer to not handle this generally, so we always reinitialize these detail messages. | |
| 1029 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); | |
| 1030 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); | |
| 1031 | |
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1032 msg = java_lang_String::create_from_str("Metadata space", CHECK_false); |
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1033 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); |
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1034 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); |
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1035 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); |
| 0 | 1036 |
| 1037 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); | |
| 1038 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); | |
| 1039 | |
| 1040 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); | |
| 1041 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); | |
| 1042 | |
| 1043 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); | |
| 1044 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); | |
| 1045 | |
| 1046 // Setup the array of errors that have preallocated backtrace | |
| 1047 k = Universe::_out_of_memory_error_java_heap->klass(); | |
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1048 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); |
| 0 | 1049 k_h = instanceKlassHandle(THREAD, k); |
| 1050 | |
| 1051 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; | |
| 1052 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); | |
| 1053 for (int i=0; i<len; i++) { | |
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1054 oop err = k_h->allocate_instance(CHECK_false); |
| 0 | 1055 Handle err_h = Handle(THREAD, err); |
| 1056 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); | |
| 1057 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); | |
| 1058 } | |
| 1059 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; | |
| 1060 } | |
| 1061 | |
| 1062 | |
| 1063 // Setup static method for registering finalizers | |
| 1064 // The finalizer klass must be linked before looking up the method, in | |
| 1065 // case it needs to get rewritten. | |
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1066 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); |
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1067 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( |
| 0 | 1068 vmSymbols::register_method_name(), |
| 1069 vmSymbols::register_method_signature()); | |
| 1070 if (m == NULL || !m->is_static()) { | |
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1071 tty->print_cr("Unable to link/verify Finalizer.register method"); |
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1072 return false; // initialization failed (cannot throw exception yet) |
| 0 | 1073 } |
| 1074 Universe::_finalizer_register_cache->init( | |
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1075 SystemDictionary::Finalizer_klass(), m); |
| 0 | 1076 |
|
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1077 // Setup method for registering loaded classes in class loader vector |
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1078 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); |
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1079 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); |
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1080 if (m == NULL || m->is_static()) { |
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1081 tty->print_cr("Unable to link/verify ClassLoader.addClass method"); |
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1082 return false; // initialization failed (cannot throw exception yet) |
|
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1083 } |
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1084 Universe::_loader_addClass_cache->init( |
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1085 SystemDictionary::ClassLoader_klass(), m); |
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1086 |
| 11010 | 1087 // Setup method for checking protection domain |
| 1088 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false); | |
| 1089 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())-> | |
| 1090 find_method(vmSymbols::impliesCreateAccessControlContext_name(), | |
| 1091 vmSymbols::void_boolean_signature()); | |
| 1092 // Allow NULL which should only happen with bootstrapping. | |
| 1093 if (m != NULL) { | |
| 1094 if (m->is_static()) { | |
| 1095 // NoSuchMethodException doesn't actually work because it tries to run the | |
| 1096 // <init> function before java_lang_Class is linked. Print error and exit. | |
| 1097 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); | |
| 1098 return false; // initialization failed | |
| 1099 } | |
| 1100 Universe::_pd_implies_cache->init( | |
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1101 SystemDictionary::ProtectionDomain_klass(), m);; |
| 11010 | 1102 } |
| 1103 | |
| 0 | 1104 // The folowing is initializing converter functions for serialization in |
| 1105 // JVM.cpp. If we clean up the StrictMath code above we may want to find | |
| 1106 // a better solution for this as well. | |
| 1107 initialize_converter_functions(); | |
| 1108 | |
| 1109 // This needs to be done before the first scavenge/gc, since | |
| 1110 // it's an input to soft ref clearing policy. | |
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1111 { |
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1112 MutexLocker x(Heap_lock); |
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1113 Universe::update_heap_info_at_gc(); |
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1114 } |
| 0 | 1115 |
| 1116 // ("weak") refs processing infrastructure initialization | |
| 1117 Universe::heap()->post_initialize(); | |
| 1118 | |
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1119 // Initialize performance counters for metaspaces |
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1120 MetaspaceCounters::initialize_performance_counters(); |
|
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1121 CompressedClassSpaceCounters::initialize_performance_counters(); |
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1122 |
|
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1123 MemoryService::add_metaspace_memory_pools(); |
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1124 |
| 0 | 1125 GC_locker::unlock(); // allow gc after bootstrapping |
| 1126 | |
| 1127 MemoryService::set_universe_heap(Universe::_collectedHeap); | |
| 1128 return true; | |
| 1129 } | |
| 1130 | |
| 1131 | |
| 1132 void Universe::compute_base_vtable_size() { | |
| 1133 _base_vtable_size = ClassLoader::compute_Object_vtable(); | |
| 1134 } | |
| 1135 | |
| 1136 | |
| 1137 // %%% The Universe::flush_foo methods belong in CodeCache. | |
| 1138 | |
| 1139 // Flushes compiled methods dependent on dependee. | |
| 1140 void Universe::flush_dependents_on(instanceKlassHandle dependee) { | |
| 1141 assert_lock_strong(Compile_lock); | |
| 1142 | |
| 1143 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
| 1144 | |
| 1145 // CodeCache can only be updated by a thread_in_VM and they will all be | |
| 1146 // stopped dring the safepoint so CodeCache will be safe to update without | |
| 1147 // holding the CodeCache_lock. | |
| 1148 | |
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1149 KlassDepChange changes(dependee); |
| 0 | 1150 |
| 1151 // Compute the dependent nmethods | |
| 1152 if (CodeCache::mark_for_deoptimization(changes) > 0) { | |
| 1153 // At least one nmethod has been marked for deoptimization | |
| 1154 VM_Deoptimize op; | |
| 1155 VMThread::execute(&op); | |
| 1156 } | |
| 1157 } | |
| 1158 | |
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1159 // Flushes compiled methods dependent on a particular CallSite |
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1160 // instance when its target is different than the given MethodHandle. |
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1161 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) { |
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1162 assert_lock_strong(Compile_lock); |
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1163 |
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1164 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; |
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1165 |
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1166 // CodeCache can only be updated by a thread_in_VM and they will all be |
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1167 // stopped dring the safepoint so CodeCache will be safe to update without |
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1168 // holding the CodeCache_lock. |
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1169 |
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1170 CallSiteDepChange changes(call_site(), method_handle()); |
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1171 |
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1172 // Compute the dependent nmethods that have a reference to a |
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1173 // CallSite object. We use InstanceKlass::mark_dependent_nmethod |
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1174 // directly instead of CodeCache::mark_for_deoptimization because we |
|
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1175 // want dependents on the call site class only not all classes in |
|
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1176 // the ContextStream. |
|
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1177 int marked = 0; |
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1178 { |
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1179 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
|
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1180 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass()); |
|
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1181 marked = call_site_klass->mark_dependent_nmethods(changes); |
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1182 } |
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1183 if (marked > 0) { |
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1184 // At least one nmethod has been marked for deoptimization |
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1185 VM_Deoptimize op; |
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1186 VMThread::execute(&op); |
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1187 } |
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1188 } |
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1189 |
| 0 | 1190 #ifdef HOTSWAP |
| 1191 // Flushes compiled methods dependent on dependee in the evolutionary sense | |
| 1192 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { | |
| 1193 // --- Compile_lock is not held. However we are at a safepoint. | |
| 1194 assert_locked_or_safepoint(Compile_lock); | |
| 1195 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
| 1196 | |
| 1197 // CodeCache can only be updated by a thread_in_VM and they will all be | |
| 1198 // stopped dring the safepoint so CodeCache will be safe to update without | |
| 1199 // holding the CodeCache_lock. | |
| 1200 | |
| 1201 // Compute the dependent nmethods | |
| 1202 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { | |
| 1203 // At least one nmethod has been marked for deoptimization | |
| 1204 | |
| 1205 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
| 1206 // Stuff copied from VM_Deoptimize and modified slightly. | |
| 1207 | |
| 1208 // We do not want any GCs to happen while we are in the middle of this VM operation | |
| 1209 ResourceMark rm; | |
| 1210 DeoptimizationMarker dm; | |
| 1211 | |
| 1212 // Deoptimize all activations depending on marked nmethods | |
| 1213 Deoptimization::deoptimize_dependents(); | |
| 1214 | |
| 1215 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
| 1216 CodeCache::make_marked_nmethods_not_entrant(); | |
| 1217 } | |
| 1218 } | |
| 1219 #endif // HOTSWAP | |
| 1220 | |
| 1221 | |
| 1222 // Flushes compiled methods dependent on dependee | |
| 1223 void Universe::flush_dependents_on_method(methodHandle m_h) { | |
| 1224 // --- Compile_lock is not held. However we are at a safepoint. | |
| 1225 assert_locked_or_safepoint(Compile_lock); | |
| 1226 | |
| 1227 // CodeCache can only be updated by a thread_in_VM and they will all be | |
| 1228 // stopped dring the safepoint so CodeCache will be safe to update without | |
| 1229 // holding the CodeCache_lock. | |
| 1230 | |
| 1231 // Compute the dependent nmethods | |
| 1232 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { | |
| 1233 // At least one nmethod has been marked for deoptimization | |
| 1234 | |
| 1235 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
| 1236 // Stuff copied from VM_Deoptimize and modified slightly. | |
| 1237 | |
| 1238 // We do not want any GCs to happen while we are in the middle of this VM operation | |
| 1239 ResourceMark rm; | |
| 1240 DeoptimizationMarker dm; | |
| 1241 | |
| 1242 // Deoptimize all activations depending on marked nmethods | |
| 1243 Deoptimization::deoptimize_dependents(); | |
| 1244 | |
| 1245 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
| 1246 CodeCache::make_marked_nmethods_not_entrant(); | |
| 1247 } | |
| 1248 } | |
| 1249 | |
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1250 void Universe::print() { |
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1251 print_on(gclog_or_tty); |
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1252 } |
| 0 | 1253 |
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1254 void Universe::print_on(outputStream* st, bool extended) { |
| 0 | 1255 st->print_cr("Heap"); |
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1256 if (!extended) { |
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1257 heap()->print_on(st); |
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1258 } else { |
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1259 heap()->print_extended_on(st); |
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1260 } |
| 0 | 1261 } |
| 1262 | |
| 1263 void Universe::print_heap_at_SIGBREAK() { | |
| 1264 if (PrintHeapAtSIGBREAK) { | |
| 1265 MutexLocker hl(Heap_lock); | |
| 1266 print_on(tty); | |
| 1267 tty->cr(); | |
| 1268 tty->flush(); | |
| 1269 } | |
| 1270 } | |
| 1271 | |
| 4944 | 1272 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { |
| 0 | 1273 st->print_cr("{Heap before GC invocations=%u (full %u):", |
| 1274 heap()->total_collections(), | |
| 1275 heap()->total_full_collections()); | |
| 4944 | 1276 if (!PrintHeapAtGCExtended || ignore_extended) { |
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1277 heap()->print_on(st); |
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1278 } else { |
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1279 heap()->print_extended_on(st); |
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1280 } |
| 0 | 1281 } |
| 1282 | |
| 4944 | 1283 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { |
| 0 | 1284 st->print_cr("Heap after GC invocations=%u (full %u):", |
| 1285 heap()->total_collections(), | |
| 1286 heap()->total_full_collections()); | |
| 4944 | 1287 if (!PrintHeapAtGCExtended || ignore_extended) { |
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1288 heap()->print_on(st); |
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1289 } else { |
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1290 heap()->print_extended_on(st); |
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1291 } |
| 0 | 1292 st->print_cr("}"); |
| 1293 } | |
| 1294 | |
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1295 void Universe::verify(VerifyOption option, const char* prefix, bool silent) { |
| 0 | 1296 // The use of _verify_in_progress is a temporary work around for |
| 1297 // 6320749. Don't bother with a creating a class to set and clear | |
| 1298 // it since it is only used in this method and the control flow is | |
| 1299 // straight forward. | |
| 1300 _verify_in_progress = true; | |
| 1301 | |
| 1302 COMPILER2_PRESENT( | |
| 1303 assert(!DerivedPointerTable::is_active(), | |
| 1304 "DPT should not be active during verification " | |
| 1305 "(of thread stacks below)"); | |
| 1306 ) | |
| 1307 | |
| 1308 ResourceMark rm; | |
| 1309 HandleMark hm; // Handles created during verification can be zapped | |
| 1310 _verify_count++; | |
| 1311 | |
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1312 if (!silent) gclog_or_tty->print(prefix); |
| 0 | 1313 if (!silent) gclog_or_tty->print("[Verifying "); |
| 1314 if (!silent) gclog_or_tty->print("threads "); | |
| 1315 Threads::verify(); | |
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1316 if (!silent) gclog_or_tty->print("heap "); |
| 6008 | 1317 heap()->verify(silent, option); |
| 0 | 1318 if (!silent) gclog_or_tty->print("syms "); |
| 1319 SymbolTable::verify(); | |
| 1320 if (!silent) gclog_or_tty->print("strs "); | |
| 1321 StringTable::verify(); | |
| 1322 { | |
| 1323 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 1324 if (!silent) gclog_or_tty->print("zone "); | |
| 1325 CodeCache::verify(); | |
| 1326 } | |
| 1327 if (!silent) gclog_or_tty->print("dict "); | |
| 1328 SystemDictionary::verify(); | |
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1329 #ifndef PRODUCT |
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1330 if (!silent) gclog_or_tty->print("cldg "); |
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1331 ClassLoaderDataGraph::verify(); |
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1332 #endif |
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1333 if (!silent) gclog_or_tty->print("metaspace chunks "); |
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1334 MetaspaceAux::verify_free_chunks(); |
| 0 | 1335 if (!silent) gclog_or_tty->print("hand "); |
| 1336 JNIHandles::verify(); | |
| 1337 if (!silent) gclog_or_tty->print("C-heap "); | |
| 1338 os::check_heap(); | |
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1339 if (!silent) gclog_or_tty->print("code cache "); |
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1340 CodeCache::verify_oops(); |
| 0 | 1341 if (!silent) gclog_or_tty->print_cr("]"); |
| 1342 | |
| 1343 _verify_in_progress = false; | |
| 1344 } | |
| 1345 | |
| 1346 // Oop verification (see MacroAssembler::verify_oop) | |
| 1347 | |
| 1348 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; | |
| 1349 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; | |
| 1350 | |
| 1351 | |
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1352 #ifndef PRODUCT |
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1353 |
| 0 | 1354 static void calculate_verify_data(uintptr_t verify_data[2], |
| 1355 HeapWord* low_boundary, | |
| 1356 HeapWord* high_boundary) { | |
| 1357 assert(low_boundary < high_boundary, "bad interval"); | |
| 1358 | |
| 1359 // decide which low-order bits we require to be clear: | |
| 1360 size_t alignSize = MinObjAlignmentInBytes; | |
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1361 size_t min_object_size = CollectedHeap::min_fill_size(); |
| 0 | 1362 |
| 1363 // make an inclusive limit: | |
| 1364 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; | |
| 1365 uintptr_t min = (uintptr_t)low_boundary; | |
| 1366 assert(min < max, "bad interval"); | |
| 1367 uintptr_t diff = max ^ min; | |
| 1368 | |
| 1369 // throw away enough low-order bits to make the diff vanish | |
| 1370 uintptr_t mask = (uintptr_t)(-1); | |
| 1371 while ((mask & diff) != 0) | |
| 1372 mask <<= 1; | |
| 1373 uintptr_t bits = (min & mask); | |
| 1374 assert(bits == (max & mask), "correct mask"); | |
| 1375 // check an intermediate value between min and max, just to make sure: | |
| 1376 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); | |
| 1377 | |
| 1378 // require address alignment, too: | |
| 1379 mask |= (alignSize - 1); | |
| 1380 | |
| 1381 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { | |
| 1382 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); | |
| 1383 } | |
| 1384 verify_data[0] = mask; | |
| 1385 verify_data[1] = bits; | |
| 1386 } | |
| 1387 | |
| 1388 // Oop verification (see MacroAssembler::verify_oop) | |
| 1389 | |
| 1390 uintptr_t Universe::verify_oop_mask() { | |
| 1391 MemRegion m = heap()->reserved_region(); | |
| 1392 calculate_verify_data(_verify_oop_data, | |
| 1393 m.start(), | |
| 1394 m.end()); | |
| 1395 return _verify_oop_data[0]; | |
| 1396 } | |
| 1397 | |
| 1398 | |
| 1399 | |
| 1400 uintptr_t Universe::verify_oop_bits() { | |
| 1401 verify_oop_mask(); | |
| 1402 return _verify_oop_data[1]; | |
| 1403 } | |
| 1404 | |
| 1405 uintptr_t Universe::verify_mark_mask() { | |
| 1406 return markOopDesc::lock_mask_in_place; | |
| 1407 } | |
| 1408 | |
| 1409 uintptr_t Universe::verify_mark_bits() { | |
| 1410 intptr_t mask = verify_mark_mask(); | |
| 1411 intptr_t bits = (intptr_t)markOopDesc::prototype(); | |
| 1412 assert((bits & ~mask) == 0, "no stray header bits"); | |
| 1413 return bits; | |
| 1414 } | |
| 1415 #endif // PRODUCT | |
| 1416 | |
| 1417 | |
| 1418 void Universe::compute_verify_oop_data() { | |
| 1419 verify_oop_mask(); | |
| 1420 verify_oop_bits(); | |
| 1421 verify_mark_mask(); | |
| 1422 verify_mark_bits(); | |
| 1423 } | |
| 1424 | |
| 1425 | |
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1426 void LatestMethodCache::init(Klass* k, Method* m) { |
| 0 | 1427 if (!UseSharedSpaces) { |
| 1428 _klass = k; | |
| 1429 } | |
| 1430 #ifndef PRODUCT | |
| 1431 else { | |
| 1432 // sharing initilization should have already set up _klass | |
| 1433 assert(_klass != NULL, "just checking"); | |
| 1434 } | |
| 1435 #endif | |
| 1436 | |
| 1437 _method_idnum = m->method_idnum(); | |
| 1438 assert(_method_idnum >= 0, "sanity check"); | |
| 1439 } | |
| 1440 | |
| 1441 | |
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1442 Method* LatestMethodCache::get_method() { |
| 11010 | 1443 if (klass() == NULL) return NULL; |
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1444 InstanceKlass* ik = InstanceKlass::cast(klass()); |
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1445 Method* m = ik->method_with_idnum(method_idnum()); |
| 0 | 1446 assert(m != NULL, "sanity check"); |
| 1447 return m; | |
| 1448 } | |
| 1449 | |
| 1450 | |
| 1451 #ifdef ASSERT | |
| 1452 // Release dummy object(s) at bottom of heap | |
| 1453 bool Universe::release_fullgc_alot_dummy() { | |
| 1454 MutexLocker ml(FullGCALot_lock); | |
| 1455 if (_fullgc_alot_dummy_array != NULL) { | |
| 1456 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { | |
| 1457 // No more dummies to release, release entire array instead | |
| 1458 _fullgc_alot_dummy_array = NULL; | |
| 1459 return false; | |
| 1460 } | |
| 1461 if (!UseConcMarkSweepGC) { | |
| 1462 // Release dummy at bottom of old generation | |
| 1463 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
| 1464 } | |
| 1465 // Release dummy at bottom of permanent generation | |
| 1466 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
| 1467 } | |
| 1468 return true; | |
| 1469 } | |
| 1470 | |
| 1471 #endif // ASSERT |