Mercurial > hg > truffle
annotate src/share/vm/memory/universe.cpp @ 6735:aed758eda82a
7195833: NPG: Rename instanceClassLoaderKlass, instanceRefKlass and instanceMirrorKlass
Summary: Simple renaming to be consistent with instanceKlass->InstanceKlass renaming
Reviewed-by: stefank, jmasa
| author | coleenp |
|---|---|
| date | Fri, 07 Sep 2012 12:04:16 -0400 |
| parents | da91efe96a93 |
| children | 11fb740ce98f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 6008 | 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/classLoader.hpp" | |
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27 #include "classfile/classLoaderData.hpp" |
| 1972 | 28 #include "classfile/javaClasses.hpp" |
| 29 #include "classfile/symbolTable.hpp" | |
| 30 #include "classfile/systemDictionary.hpp" | |
| 31 #include "classfile/vmSymbols.hpp" | |
| 32 #include "code/codeCache.hpp" | |
| 33 #include "code/dependencies.hpp" | |
| 34 #include "gc_interface/collectedHeap.inline.hpp" | |
| 35 #include "interpreter/interpreter.hpp" | |
| 36 #include "memory/cardTableModRefBS.hpp" | |
| 37 #include "memory/gcLocker.inline.hpp" | |
| 38 #include "memory/genCollectedHeap.hpp" | |
| 39 #include "memory/genRemSet.hpp" | |
| 40 #include "memory/generation.hpp" | |
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41 #include "memory/metadataFactory.hpp" |
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42 #include "memory/metaspaceShared.hpp" |
| 1972 | 43 #include "memory/oopFactory.hpp" |
| 44 #include "memory/space.hpp" | |
| 45 #include "memory/universe.hpp" | |
| 46 #include "memory/universe.inline.hpp" | |
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47 #include "oops/constantPool.hpp" |
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48 #include "oops/instanceClassLoaderKlass.hpp" |
| 1972 | 49 #include "oops/instanceKlass.hpp" |
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50 #include "oops/instanceMirrorKlass.hpp" |
| 1972 | 51 #include "oops/instanceRefKlass.hpp" |
| 52 #include "oops/oop.inline.hpp" | |
| 53 #include "oops/typeArrayKlass.hpp" | |
| 54 #include "prims/jvmtiRedefineClassesTrace.hpp" | |
| 55 #include "runtime/aprofiler.hpp" | |
| 56 #include "runtime/arguments.hpp" | |
| 57 #include "runtime/deoptimization.hpp" | |
| 58 #include "runtime/fprofiler.hpp" | |
| 59 #include "runtime/handles.inline.hpp" | |
| 60 #include "runtime/init.hpp" | |
| 61 #include "runtime/java.hpp" | |
| 62 #include "runtime/javaCalls.hpp" | |
| 63 #include "runtime/sharedRuntime.hpp" | |
| 64 #include "runtime/synchronizer.hpp" | |
| 65 #include "runtime/timer.hpp" | |
| 66 #include "runtime/vm_operations.hpp" | |
| 67 #include "services/memoryService.hpp" | |
| 68 #include "utilities/copy.hpp" | |
| 69 #include "utilities/events.hpp" | |
| 70 #include "utilities/hashtable.inline.hpp" | |
| 71 #include "utilities/preserveException.hpp" | |
| 72 #ifdef TARGET_OS_FAMILY_linux | |
| 73 # include "thread_linux.inline.hpp" | |
| 74 #endif | |
| 75 #ifdef TARGET_OS_FAMILY_solaris | |
| 76 # include "thread_solaris.inline.hpp" | |
| 77 #endif | |
| 78 #ifdef TARGET_OS_FAMILY_windows | |
| 79 # include "thread_windows.inline.hpp" | |
| 80 #endif | |
| 3960 | 81 #ifdef TARGET_OS_FAMILY_bsd |
| 82 # include "thread_bsd.inline.hpp" | |
| 83 #endif | |
| 1972 | 84 #ifndef SERIALGC |
| 85 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" | |
| 86 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp" | |
| 87 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 88 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
| 89 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
| 90 #endif | |
| 0 | 91 |
| 92 // Known objects | |
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93 Klass* Universe::_boolArrayKlassObj = NULL; |
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94 Klass* Universe::_byteArrayKlassObj = NULL; |
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95 Klass* Universe::_charArrayKlassObj = NULL; |
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96 Klass* Universe::_intArrayKlassObj = NULL; |
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97 Klass* Universe::_shortArrayKlassObj = NULL; |
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98 Klass* Universe::_longArrayKlassObj = NULL; |
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99 Klass* Universe::_singleArrayKlassObj = NULL; |
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100 Klass* Universe::_doubleArrayKlassObj = NULL; |
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101 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; |
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102 Klass* Universe::_objectArrayKlassObj = NULL; |
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103 oop Universe::_int_mirror = NULL; |
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104 oop Universe::_float_mirror = NULL; |
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105 oop Universe::_double_mirror = NULL; |
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106 oop Universe::_byte_mirror = NULL; |
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107 oop Universe::_bool_mirror = NULL; |
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108 oop Universe::_char_mirror = NULL; |
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109 oop Universe::_long_mirror = NULL; |
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110 oop Universe::_short_mirror = NULL; |
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111 oop Universe::_void_mirror = NULL; |
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112 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; |
| 0 | 113 oop Universe::_main_thread_group = NULL; |
| 114 oop Universe::_system_thread_group = NULL; | |
| 115 objArrayOop Universe::_the_empty_class_klass_array = NULL; | |
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116 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; |
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117 oop Universe::_the_null_string = NULL; |
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118 oop Universe::_the_min_jint_string = NULL; |
| 0 | 119 LatestMethodOopCache* Universe::_finalizer_register_cache = NULL; |
| 120 ActiveMethodOopsCache* Universe::_reflect_invoke_cache = NULL; | |
| 121 oop Universe::_out_of_memory_error_java_heap = NULL; | |
| 122 oop Universe::_out_of_memory_error_perm_gen = NULL; | |
| 123 oop Universe::_out_of_memory_error_array_size = NULL; | |
| 124 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; | |
| 125 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; | |
| 126 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; | |
| 127 bool Universe::_verify_in_progress = false; | |
| 128 oop Universe::_null_ptr_exception_instance = NULL; | |
| 129 oop Universe::_arithmetic_exception_instance = NULL; | |
| 130 oop Universe::_virtual_machine_error_instance = NULL; | |
| 131 oop Universe::_vm_exception = NULL; | |
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132 Array<int>* Universe::_the_empty_int_array = NULL; |
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133 Array<u2>* Universe::_the_empty_short_array = NULL; |
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134 Array<Klass*>* Universe::_the_empty_klass_array = NULL; |
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135 Array<Method*>* Universe::_the_empty_method_array = NULL; |
| 0 | 136 |
| 137 // These variables are guarded by FullGCALot_lock. | |
| 138 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) | |
| 139 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) | |
| 140 | |
| 141 // Heap | |
| 142 int Universe::_verify_count = 0; | |
| 143 | |
| 144 int Universe::_base_vtable_size = 0; | |
| 145 bool Universe::_bootstrapping = false; | |
| 146 bool Universe::_fully_initialized = false; | |
| 147 | |
| 148 size_t Universe::_heap_capacity_at_last_gc; | |
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149 size_t Universe::_heap_used_at_last_gc = 0; |
| 0 | 150 |
| 151 CollectedHeap* Universe::_collectedHeap = NULL; | |
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152 |
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153 NarrowOopStruct Universe::_narrow_oop = { NULL, 0, true }; |
| 0 | 154 |
| 155 | |
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156 void Universe::basic_type_classes_do(void f(Klass*)) { |
| 0 | 157 f(boolArrayKlassObj()); |
| 158 f(byteArrayKlassObj()); | |
| 159 f(charArrayKlassObj()); | |
| 160 f(intArrayKlassObj()); | |
| 161 f(shortArrayKlassObj()); | |
| 162 f(longArrayKlassObj()); | |
| 163 f(singleArrayKlassObj()); | |
| 164 f(doubleArrayKlassObj()); | |
| 165 } | |
| 166 | |
| 167 void Universe::oops_do(OopClosure* f, bool do_all) { | |
| 168 | |
| 169 f->do_oop((oop*) &_int_mirror); | |
| 170 f->do_oop((oop*) &_float_mirror); | |
| 171 f->do_oop((oop*) &_double_mirror); | |
| 172 f->do_oop((oop*) &_byte_mirror); | |
| 173 f->do_oop((oop*) &_bool_mirror); | |
| 174 f->do_oop((oop*) &_char_mirror); | |
| 175 f->do_oop((oop*) &_long_mirror); | |
| 176 f->do_oop((oop*) &_short_mirror); | |
| 177 f->do_oop((oop*) &_void_mirror); | |
| 178 | |
| 179 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
| 180 f->do_oop((oop*) &_mirrors[i]); | |
| 181 } | |
| 182 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); | |
| 183 | |
| 184 f->do_oop((oop*)&_the_empty_class_klass_array); | |
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185 f->do_oop((oop*)&_the_null_string); |
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186 f->do_oop((oop*)&_the_min_jint_string); |
| 0 | 187 f->do_oop((oop*)&_out_of_memory_error_java_heap); |
| 188 f->do_oop((oop*)&_out_of_memory_error_perm_gen); | |
| 189 f->do_oop((oop*)&_out_of_memory_error_array_size); | |
| 190 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); | |
| 191 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); | |
| 192 f->do_oop((oop*)&_null_ptr_exception_instance); | |
| 193 f->do_oop((oop*)&_arithmetic_exception_instance); | |
| 194 f->do_oop((oop*)&_virtual_machine_error_instance); | |
| 195 f->do_oop((oop*)&_main_thread_group); | |
| 196 f->do_oop((oop*)&_system_thread_group); | |
| 197 f->do_oop((oop*)&_vm_exception); | |
| 198 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) | |
| 199 } | |
| 200 | |
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201 // Serialize metadata in and out of CDS archive, not oops. |
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202 void Universe::serialize(SerializeClosure* f, bool do_all) { |
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203 |
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204 f->do_ptr((void**)&_boolArrayKlassObj); |
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205 f->do_ptr((void**)&_byteArrayKlassObj); |
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206 f->do_ptr((void**)&_charArrayKlassObj); |
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207 f->do_ptr((void**)&_intArrayKlassObj); |
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208 f->do_ptr((void**)&_shortArrayKlassObj); |
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209 f->do_ptr((void**)&_longArrayKlassObj); |
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210 f->do_ptr((void**)&_singleArrayKlassObj); |
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211 f->do_ptr((void**)&_doubleArrayKlassObj); |
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212 f->do_ptr((void**)&_objectArrayKlassObj); |
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213 |
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214 { |
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215 for (int i = 0; i < T_VOID+1; i++) { |
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216 if (_typeArrayKlassObjs[i] != NULL) { |
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217 assert(i >= T_BOOLEAN, "checking"); |
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218 f->do_ptr((void**)&_typeArrayKlassObjs[i]); |
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219 } else if (do_all) { |
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220 f->do_ptr((void**)&_typeArrayKlassObjs[i]); |
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221 } |
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222 } |
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223 } |
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224 |
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225 f->do_ptr((void**)&_the_array_interfaces_array); |
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226 f->do_ptr((void**)&_the_empty_int_array); |
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227 f->do_ptr((void**)&_the_empty_short_array); |
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228 f->do_ptr((void**)&_the_empty_method_array); |
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229 f->do_ptr((void**)&_the_empty_klass_array); |
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230 _finalizer_register_cache->serialize(f); |
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231 _reflect_invoke_cache->serialize(f); |
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232 } |
| 0 | 233 |
| 234 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { | |
| 235 if (size < alignment || size % alignment != 0) { | |
| 236 ResourceMark rm; | |
| 237 stringStream st; | |
| 238 st.print("Size of %s (%ld bytes) must be aligned to %ld bytes", name, size, alignment); | |
| 239 char* error = st.as_string(); | |
| 240 vm_exit_during_initialization(error); | |
| 241 } | |
| 242 } | |
| 243 | |
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244 void initialize_basic_type_klass(Klass* k, TRAPS) { |
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245 Klass* ok = SystemDictionary::Object_klass(); |
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246 if (UseSharedSpaces) { |
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247 assert(k->super() == ok, "u3"); |
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248 k->restore_unshareable_info(CHECK); |
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249 } else { |
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250 k->initialize_supers(ok, CHECK); |
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251 } |
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252 k->append_to_sibling_list(); |
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253 } |
| 0 | 254 |
| 255 void Universe::genesis(TRAPS) { | |
| 256 ResourceMark rm; | |
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257 |
| 0 | 258 { FlagSetting fs(_bootstrapping, true); |
| 259 | |
| 260 { MutexLocker mc(Compile_lock); | |
| 261 | |
| 262 // determine base vtable size; without that we cannot create the array klasses | |
| 263 compute_base_vtable_size(); | |
| 264 | |
| 265 if (!UseSharedSpaces) { | |
| 266 _boolArrayKlassObj = typeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); | |
| 267 _charArrayKlassObj = typeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); | |
| 268 _singleArrayKlassObj = typeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); | |
| 269 _doubleArrayKlassObj = typeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); | |
| 270 _byteArrayKlassObj = typeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); | |
| 271 _shortArrayKlassObj = typeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); | |
| 272 _intArrayKlassObj = typeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); | |
| 273 _longArrayKlassObj = typeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); | |
| 274 | |
| 275 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; | |
| 276 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; | |
| 277 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; | |
| 278 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; | |
| 279 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; | |
| 280 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; | |
| 281 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; | |
| 282 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; | |
| 283 | |
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284 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); |
| 0 | 285 |
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286 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); |
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287 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); |
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288 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); |
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289 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); |
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290 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); |
| 0 | 291 } |
| 292 } | |
| 293 | |
| 294 vmSymbols::initialize(CHECK); | |
| 295 | |
| 296 SystemDictionary::initialize(CHECK); | |
| 297 | |
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298 Klass* ok = SystemDictionary::Object_klass(); |
| 0 | 299 |
|
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300 _the_null_string = StringTable::intern("null", CHECK); |
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301 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); |
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302 |
| 0 | 303 if (UseSharedSpaces) { |
| 304 // Verify shared interfaces array. | |
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305 assert(_the_array_interfaces_array->at(0) == |
| 1142 | 306 SystemDictionary::Cloneable_klass(), "u3"); |
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307 assert(_the_array_interfaces_array->at(1) == |
| 1142 | 308 SystemDictionary::Serializable_klass(), "u3"); |
| 0 | 309 } else { |
| 310 // Set up shared interfaces array. (Do this before supers are set up.) | |
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311 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); |
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312 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); |
| 0 | 313 } |
| 314 | |
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315 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); |
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316 initialize_basic_type_klass(charArrayKlassObj(), CHECK); |
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317 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); |
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318 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); |
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319 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); |
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320 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); |
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321 initialize_basic_type_klass(intArrayKlassObj(), CHECK); |
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322 initialize_basic_type_klass(longArrayKlassObj(), CHECK); |
| 0 | 323 } // end of core bootstrapping |
| 324 | |
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325 // Maybe this could be lifted up now that object array can be initialized |
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326 // during the bootstrapping. |
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327 |
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328 // OLD |
| 0 | 329 // Initialize _objectArrayKlass after core bootstraping to make |
| 330 // sure the super class is set up properly for _objectArrayKlass. | |
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331 // --- |
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332 // NEW |
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333 // Since some of the old system object arrays have been converted to |
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334 // ordinary object arrays, _objectArrayKlass will be loaded when |
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335 // SystemDictionary::initialize(CHECK); is run. See the extra check |
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336 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. |
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337 _objectArrayKlassObj = InstanceKlass:: |
| 1142 | 338 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); |
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339 // OLD |
| 0 | 340 // Add the class to the class hierarchy manually to make sure that |
| 341 // its vtable is initialized after core bootstrapping is completed. | |
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342 // --- |
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343 // New |
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344 // Have already been initialized. |
| 0 | 345 Klass::cast(_objectArrayKlassObj)->append_to_sibling_list(); |
| 346 | |
| 347 // Compute is_jdk version flags. | |
| 348 // Only 1.3 or later has the java.lang.Shutdown class. | |
| 349 // Only 1.4 or later has the java.lang.CharSequence interface. | |
| 350 // Only 1.5 or later has the java.lang.management.MemoryUsage class. | |
| 242 | 351 if (JDK_Version::is_partially_initialized()) { |
| 352 uint8_t jdk_version; | |
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353 Klass* k = SystemDictionary::resolve_or_null( |
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354 vmSymbols::java_lang_management_MemoryUsage(), THREAD); |
| 0 | 355 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
| 356 if (k == NULL) { | |
| 242 | 357 k = SystemDictionary::resolve_or_null( |
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358 vmSymbols::java_lang_CharSequence(), THREAD); |
| 0 | 359 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
| 360 if (k == NULL) { | |
| 242 | 361 k = SystemDictionary::resolve_or_null( |
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362 vmSymbols::java_lang_Shutdown(), THREAD); |
| 0 | 363 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
| 364 if (k == NULL) { | |
| 242 | 365 jdk_version = 2; |
| 0 | 366 } else { |
| 242 | 367 jdk_version = 3; |
| 0 | 368 } |
| 369 } else { | |
| 242 | 370 jdk_version = 4; |
| 0 | 371 } |
| 372 } else { | |
| 242 | 373 jdk_version = 5; |
| 0 | 374 } |
| 242 | 375 JDK_Version::fully_initialize(jdk_version); |
| 0 | 376 } |
| 377 | |
| 378 #ifdef ASSERT | |
| 379 if (FullGCALot) { | |
| 380 // Allocate an array of dummy objects. | |
| 381 // We'd like these to be at the bottom of the old generation, | |
| 382 // so that when we free one and then collect, | |
| 383 // (almost) the whole heap moves | |
| 384 // and we find out if we actually update all the oops correctly. | |
| 385 // But we can't allocate directly in the old generation, | |
| 386 // so we allocate wherever, and hope that the first collection | |
| 387 // moves these objects to the bottom of the old generation. | |
| 388 // We can allocate directly in the permanent generation, so we do. | |
| 389 int size; | |
| 390 if (UseConcMarkSweepGC) { | |
| 391 warning("Using +FullGCALot with concurrent mark sweep gc " | |
| 392 "will not force all objects to relocate"); | |
| 393 size = FullGCALotDummies; | |
| 394 } else { | |
| 395 size = FullGCALotDummies * 2; | |
| 396 } | |
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397 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); |
| 0 | 398 objArrayHandle dummy_array(THREAD, naked_array); |
| 399 int i = 0; | |
| 400 while (i < size) { | |
| 401 // Allocate dummy in old generation | |
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402 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); |
| 0 | 403 dummy_array->obj_at_put(i++, dummy); |
| 404 } | |
| 405 { | |
| 406 // Only modify the global variable inside the mutex. | |
| 407 // If we had a race to here, the other dummy_array instances | |
| 408 // and their elements just get dropped on the floor, which is fine. | |
| 409 MutexLocker ml(FullGCALot_lock); | |
| 410 if (_fullgc_alot_dummy_array == NULL) { | |
| 411 _fullgc_alot_dummy_array = dummy_array(); | |
| 412 } | |
| 413 } | |
| 414 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); | |
| 415 } | |
| 416 #endif | |
| 417 } | |
| 418 | |
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419 // CDS support for patching vtables in metadata in the shared archive. |
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420 // All types inherited from Metadata have vtables, but not types inherited |
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421 // from MetaspaceObj, because the latter does not have virtual functions. |
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422 // If the metadata type has a vtable, it cannot be shared in the read-only |
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423 // section of the CDS archive, because the vtable pointer is patched. |
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424 static inline void* dereference(void* addr) { |
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425 return *(void**)addr; |
| 0 | 426 } |
| 427 | |
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428 static inline void add_vtable(void** list, int* n, void* o, int count) { |
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429 guarantee((*n) < count, "vtable list too small"); |
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430 void* vtable = dereference(o); |
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431 assert(dereference(vtable) != NULL, "invalid vtable"); |
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432 list[(*n)++] = vtable; |
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433 } |
| 0 | 434 |
| 435 void Universe::init_self_patching_vtbl_list(void** list, int count) { | |
| 436 int n = 0; | |
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437 { InstanceKlass o; add_vtable(list, &n, &o, count); } |
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438 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } |
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439 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } |
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440 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } |
| 0 | 441 { typeArrayKlass o; add_vtable(list, &n, &o, count); } |
| 442 { objArrayKlass o; add_vtable(list, &n, &o, count); } | |
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443 { Method o; add_vtable(list, &n, &o, count); } |
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444 { ConstantPool o; add_vtable(list, &n, &o, count); } |
| 0 | 445 } |
| 446 | |
| 447 void Universe::initialize_basic_type_mirrors(TRAPS) { | |
| 448 assert(_int_mirror==NULL, "basic type mirrors already initialized"); | |
| 449 _int_mirror = | |
| 450 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); | |
| 451 _float_mirror = | |
| 452 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); | |
| 453 _double_mirror = | |
| 454 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); | |
| 455 _byte_mirror = | |
| 456 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); | |
| 457 _bool_mirror = | |
| 458 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); | |
| 459 _char_mirror = | |
| 460 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); | |
| 461 _long_mirror = | |
| 462 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); | |
| 463 _short_mirror = | |
| 464 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); | |
| 465 _void_mirror = | |
| 466 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); | |
| 467 | |
| 468 _mirrors[T_INT] = _int_mirror; | |
| 469 _mirrors[T_FLOAT] = _float_mirror; | |
| 470 _mirrors[T_DOUBLE] = _double_mirror; | |
| 471 _mirrors[T_BYTE] = _byte_mirror; | |
| 472 _mirrors[T_BOOLEAN] = _bool_mirror; | |
| 473 _mirrors[T_CHAR] = _char_mirror; | |
| 474 _mirrors[T_LONG] = _long_mirror; | |
| 475 _mirrors[T_SHORT] = _short_mirror; | |
| 476 _mirrors[T_VOID] = _void_mirror; | |
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477 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); |
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478 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); |
| 0 | 479 } |
| 480 | |
| 481 void Universe::fixup_mirrors(TRAPS) { | |
| 482 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, | |
| 483 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply | |
| 484 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note | |
| 485 // that the number of objects allocated at this point is very small. | |
| 1142 | 486 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); |
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487 HandleMark hm(THREAD); |
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488 // Cache the start of the static fields |
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489 InstanceMirrorKlass::init_offset_of_static_fields(); |
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490 |
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491 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); |
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492 int list_length = list->length(); |
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493 for (int i = 0; i < list_length; i++) { |
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494 Klass* k = list->at(i); |
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495 assert(k->is_klass(), "List should only hold classes"); |
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496 EXCEPTION_MARK; |
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497 KlassHandle kh(THREAD, k); |
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498 java_lang_Class::fixup_mirror(kh, CATCH); |
| 0 | 499 } |
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500 delete java_lang_Class::fixup_mirror_list(); |
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501 java_lang_Class::set_fixup_mirror_list(NULL); |
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502 } |
| 0 | 503 |
| 504 static bool has_run_finalizers_on_exit = false; | |
| 505 | |
| 506 void Universe::run_finalizers_on_exit() { | |
| 507 if (has_run_finalizers_on_exit) return; | |
| 508 has_run_finalizers_on_exit = true; | |
| 509 | |
| 510 // Called on VM exit. This ought to be run in a separate thread. | |
| 511 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); | |
| 512 { | |
| 513 PRESERVE_EXCEPTION_MARK; | |
| 1142 | 514 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); |
| 0 | 515 JavaValue result(T_VOID); |
| 516 JavaCalls::call_static( | |
| 517 &result, | |
| 518 finalizer_klass, | |
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519 vmSymbols::run_finalizers_on_exit_name(), |
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520 vmSymbols::void_method_signature(), |
| 0 | 521 THREAD |
| 522 ); | |
| 523 // Ignore any pending exceptions | |
| 524 CLEAR_PENDING_EXCEPTION; | |
| 525 } | |
| 526 } | |
| 527 | |
| 528 | |
| 529 // initialize_vtable could cause gc if | |
| 530 // 1) we specified true to initialize_vtable and | |
| 531 // 2) this ran after gc was enabled | |
| 532 // In case those ever change we use handles for oops | |
| 533 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { | |
| 534 // init vtable of k and all subclasses | |
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535 Klass* ko = k_h(); |
| 0 | 536 klassVtable* vt = ko->vtable(); |
| 537 if (vt) vt->initialize_vtable(false, CHECK); | |
| 538 if (ko->oop_is_instance()) { | |
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539 InstanceKlass* ik = (InstanceKlass*)ko; |
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540 for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->next_sibling())) { |
| 0 | 541 reinitialize_vtable_of(s_h, CHECK); |
| 542 } | |
| 543 } | |
| 544 } | |
| 545 | |
| 546 | |
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547 void initialize_itable_for_klass(Klass* k, TRAPS) { |
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548 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); |
| 0 | 549 } |
| 550 | |
| 551 | |
| 552 void Universe::reinitialize_itables(TRAPS) { | |
| 553 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); | |
| 554 | |
| 555 } | |
| 556 | |
| 557 | |
| 558 bool Universe::on_page_boundary(void* addr) { | |
| 559 return ((uintptr_t) addr) % os::vm_page_size() == 0; | |
| 560 } | |
| 561 | |
| 562 | |
| 563 bool Universe::should_fill_in_stack_trace(Handle throwable) { | |
| 564 // never attempt to fill in the stack trace of preallocated errors that do not have | |
| 565 // backtrace. These errors are kept alive forever and may be "re-used" when all | |
| 566 // preallocated errors with backtrace have been consumed. Also need to avoid | |
| 567 // a potential loop which could happen if an out of memory occurs when attempting | |
| 568 // to allocate the backtrace. | |
| 569 return ((throwable() != Universe::_out_of_memory_error_java_heap) && | |
| 570 (throwable() != Universe::_out_of_memory_error_perm_gen) && | |
| 571 (throwable() != Universe::_out_of_memory_error_array_size) && | |
| 572 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); | |
| 573 } | |
| 574 | |
| 575 | |
| 576 oop Universe::gen_out_of_memory_error(oop default_err) { | |
| 577 // generate an out of memory error: | |
| 578 // - if there is a preallocated error with backtrace available then return it wth | |
| 579 // a filled in stack trace. | |
| 580 // - if there are no preallocated errors with backtrace available then return | |
| 581 // an error without backtrace. | |
| 582 int next; | |
| 583 if (_preallocated_out_of_memory_error_avail_count > 0) { | |
| 584 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); | |
| 585 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); | |
| 586 } else { | |
| 587 next = -1; | |
| 588 } | |
| 589 if (next < 0) { | |
| 590 // all preallocated errors have been used. | |
| 591 // return default | |
| 592 return default_err; | |
| 593 } else { | |
| 594 // get the error object at the slot and set set it to NULL so that the | |
| 595 // array isn't keeping it alive anymore. | |
| 596 oop exc = preallocated_out_of_memory_errors()->obj_at(next); | |
| 597 assert(exc != NULL, "slot has been used already"); | |
| 598 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); | |
| 599 | |
| 600 // use the message from the default error | |
| 601 oop msg = java_lang_Throwable::message(default_err); | |
| 602 assert(msg != NULL, "no message"); | |
| 603 java_lang_Throwable::set_message(exc, msg); | |
| 604 | |
| 605 // populate the stack trace and return it. | |
| 606 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); | |
| 607 return exc; | |
| 608 } | |
| 609 } | |
| 610 | |
| 611 static intptr_t non_oop_bits = 0; | |
| 612 | |
| 613 void* Universe::non_oop_word() { | |
| 614 // Neither the high bits nor the low bits of this value is allowed | |
| 615 // to look like (respectively) the high or low bits of a real oop. | |
| 616 // | |
| 617 // High and low are CPU-specific notions, but low always includes | |
| 618 // the low-order bit. Since oops are always aligned at least mod 4, | |
| 619 // setting the low-order bit will ensure that the low half of the | |
| 620 // word will never look like that of a real oop. | |
| 621 // | |
| 622 // Using the OS-supplied non-memory-address word (usually 0 or -1) | |
| 623 // will take care of the high bits, however many there are. | |
| 624 | |
| 625 if (non_oop_bits == 0) { | |
| 626 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; | |
| 627 } | |
| 628 | |
| 629 return (void*)non_oop_bits; | |
| 630 } | |
| 631 | |
| 632 jint universe_init() { | |
| 633 assert(!Universe::_fully_initialized, "called after initialize_vtables"); | |
| 634 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), | |
| 635 "LogHeapWordSize is incorrect."); | |
| 636 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); | |
| 637 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, | |
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638 "oop size is not not a multiple of HeapWord size"); |
| 0 | 639 TraceTime timer("Genesis", TraceStartupTime); |
| 640 GC_locker::lock(); // do not allow gc during bootstrapping | |
| 641 JavaClasses::compute_hard_coded_offsets(); | |
| 642 | |
| 643 jint status = Universe::initialize_heap(); | |
| 644 if (status != JNI_OK) { | |
| 645 return status; | |
| 646 } | |
| 647 | |
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648 // Create memory for metadata. Must be after initializing heap for |
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649 // DumpSharedSpaces. |
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650 ClassLoaderData::init_null_class_loader_data(); |
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651 |
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652 // We have a heap so create the Method* caches before |
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653 // Metaspace::initialize_shared_spaces() tries to populate them. |
| 0 | 654 Universe::_finalizer_register_cache = new LatestMethodOopCache(); |
| 655 Universe::_reflect_invoke_cache = new ActiveMethodOopsCache(); | |
| 656 | |
| 657 if (UseSharedSpaces) { | |
| 658 // Read the data structures supporting the shared spaces (shared | |
| 659 // system dictionary, symbol table, etc.). After that, access to | |
| 660 // the file (other than the mapped regions) is no longer needed, and | |
| 661 // the file is closed. Closing the file does not affect the | |
| 662 // currently mapped regions. | |
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663 MetaspaceShared::initialize_shared_spaces(); |
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664 StringTable::create_table(); |
| 0 | 665 } else { |
| 666 SymbolTable::create_table(); | |
| 667 StringTable::create_table(); | |
| 668 ClassLoader::create_package_info_table(); | |
| 669 } | |
| 670 | |
| 671 return JNI_OK; | |
| 672 } | |
| 673 | |
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674 // Choose the heap base address and oop encoding mode |
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675 // when compressed oops are used: |
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676 // Unscaled - Use 32-bits oops without encoding when |
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677 // NarrowOopHeapBaseMin + heap_size < 4Gb |
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678 // ZeroBased - Use zero based compressed oops with encoding when |
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679 // NarrowOopHeapBaseMin + heap_size < 32Gb |
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680 // HeapBased - Use compressed oops with heap base + encoding. |
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681 |
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682 // 4Gb |
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683 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); |
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684 // 32Gb |
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685 // OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes; |
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686 |
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687 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) { |
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688 size_t base = 0; |
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689 #ifdef _LP64 |
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690 if (UseCompressedOops) { |
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691 assert(mode == UnscaledNarrowOop || |
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692 mode == ZeroBasedNarrowOop || |
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693 mode == HeapBasedNarrowOop, "mode is invalid"); |
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694 const size_t total_size = heap_size + HeapBaseMinAddress; |
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695 // Return specified base for the first request. |
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696 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { |
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697 base = HeapBaseMinAddress; |
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698 } else if (total_size <= OopEncodingHeapMax && (mode != HeapBasedNarrowOop)) { |
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699 if (total_size <= NarrowOopHeapMax && (mode == UnscaledNarrowOop) && |
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700 (Universe::narrow_oop_shift() == 0)) { |
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701 // Use 32-bits oops without encoding and |
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702 // place heap's top on the 4Gb boundary |
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703 base = (NarrowOopHeapMax - heap_size); |
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704 } else { |
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705 // Can't reserve with NarrowOopShift == 0 |
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706 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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707 if (mode == UnscaledNarrowOop || |
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708 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { |
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709 // Use zero based compressed oops with encoding and |
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710 // place heap's top on the 32Gb boundary in case |
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711 // total_size > 4Gb or failed to reserve below 4Gb. |
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712 base = (OopEncodingHeapMax - heap_size); |
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713 } |
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714 } |
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715 } else { |
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716 // Can't reserve below 32Gb. |
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717 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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718 } |
|
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719 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks |
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720 // used in ReservedHeapSpace() constructors. |
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721 // The final values will be set in initialize_heap() below. |
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722 if (base != 0 && (base + heap_size) <= OopEncodingHeapMax) { |
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723 // Use zero based compressed oops |
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724 Universe::set_narrow_oop_base(NULL); |
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725 // Don't need guard page for implicit checks in indexed |
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726 // addressing mode with zero based Compressed Oops. |
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727 Universe::set_narrow_oop_use_implicit_null_checks(true); |
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728 } else { |
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729 // Set to a non-NULL value so the ReservedSpace ctor computes |
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730 // the correct no-access prefix. |
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731 // The final value will be set in initialize_heap() below. |
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732 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); |
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733 #ifdef _WIN64 |
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734 if (UseLargePages) { |
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735 // Cannot allocate guard pages for implicit checks in indexed |
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736 // addressing mode when large pages are specified on windows. |
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737 Universe::set_narrow_oop_use_implicit_null_checks(false); |
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738 } |
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739 #endif // _WIN64 |
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740 } |
|
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741 } |
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742 #endif |
|
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743 return (char*)base; // also return NULL (don't care) for 32-bit VM |
|
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744 } |
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745 |
| 0 | 746 jint Universe::initialize_heap() { |
| 747 | |
| 748 if (UseParallelGC) { | |
| 749 #ifndef SERIALGC | |
| 750 Universe::_collectedHeap = new ParallelScavengeHeap(); | |
| 751 #else // SERIALGC | |
| 752 fatal("UseParallelGC not supported in java kernel vm."); | |
| 753 #endif // SERIALGC | |
| 754 | |
|
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755 } else if (UseG1GC) { |
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756 #ifndef SERIALGC |
| 4013 | 757 G1CollectorPolicy* g1p = new G1CollectorPolicy(); |
|
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758 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); |
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759 Universe::_collectedHeap = g1h; |
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760 #else // SERIALGC |
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761 fatal("UseG1GC not supported in java kernel vm."); |
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762 #endif // SERIALGC |
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763 |
| 0 | 764 } else { |
| 765 GenCollectorPolicy *gc_policy; | |
| 766 | |
| 767 if (UseSerialGC) { | |
| 768 gc_policy = new MarkSweepPolicy(); | |
| 769 } else if (UseConcMarkSweepGC) { | |
| 770 #ifndef SERIALGC | |
| 771 if (UseAdaptiveSizePolicy) { | |
| 772 gc_policy = new ASConcurrentMarkSweepPolicy(); | |
| 773 } else { | |
| 774 gc_policy = new ConcurrentMarkSweepPolicy(); | |
| 775 } | |
| 776 #else // SERIALGC | |
| 777 fatal("UseConcMarkSweepGC not supported in java kernel vm."); | |
| 778 #endif // SERIALGC | |
| 779 } else { // default old generation | |
| 780 gc_policy = new MarkSweepPolicy(); | |
| 781 } | |
| 782 | |
| 783 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); | |
| 784 } | |
| 785 | |
| 786 jint status = Universe::heap()->initialize(); | |
| 787 if (status != JNI_OK) { | |
| 788 return status; | |
| 789 } | |
|
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790 |
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791 #ifdef _LP64 |
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792 if (UseCompressedOops) { |
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793 // Subtract a page because something can get allocated at heap base. |
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794 // This also makes implicit null checking work, because the |
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795 // memory+1 page below heap_base needs to cause a signal. |
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796 // See needs_explicit_null_check. |
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797 // Only set the heap base for compressed oops because it indicates |
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798 // compressed oops for pstack code. |
| 2080 | 799 bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose); |
| 800 if (verbose) { | |
|
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801 tty->cr(); |
| 1963 | 802 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", |
| 803 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); | |
|
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804 } |
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805 if ((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax) { |
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806 // Can't reserve heap below 32Gb. |
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807 Universe::set_narrow_oop_base(Universe::heap()->base() - os::vm_page_size()); |
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808 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
| 2080 | 809 if (verbose) { |
|
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810 tty->print(", Compressed Oops with base: "PTR_FORMAT, Universe::narrow_oop_base()); |
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811 } |
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812 } else { |
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813 Universe::set_narrow_oop_base(0); |
| 2080 | 814 if (verbose) { |
|
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815 tty->print(", zero based Compressed Oops"); |
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816 } |
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817 #ifdef _WIN64 |
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818 if (!Universe::narrow_oop_use_implicit_null_checks()) { |
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819 // Don't need guard page for implicit checks in indexed addressing |
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820 // mode with zero based Compressed Oops. |
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821 Universe::set_narrow_oop_use_implicit_null_checks(true); |
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822 } |
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823 #endif // _WIN64 |
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824 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { |
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825 // Can't reserve heap below 4Gb. |
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826 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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827 } else { |
|
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828 Universe::set_narrow_oop_shift(0); |
| 2080 | 829 if (verbose) { |
|
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830 tty->print(", 32-bits Oops"); |
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831 } |
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832 } |
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833 } |
| 2080 | 834 if (verbose) { |
|
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835 tty->cr(); |
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836 tty->cr(); |
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837 } |
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838 } |
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839 assert(Universe::narrow_oop_base() == (Universe::heap()->base() - os::vm_page_size()) || |
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840 Universe::narrow_oop_base() == NULL, "invalid value"); |
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841 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || |
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842 Universe::narrow_oop_shift() == 0, "invalid value"); |
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843 #endif |
| 0 | 844 |
| 845 // We will never reach the CATCH below since Exceptions::_throw will cause | |
| 846 // the VM to exit if an exception is thrown during initialization | |
| 847 | |
| 848 if (UseTLAB) { | |
| 849 assert(Universe::heap()->supports_tlab_allocation(), | |
| 850 "Should support thread-local allocation buffers"); | |
| 851 ThreadLocalAllocBuffer::startup_initialization(); | |
| 852 } | |
| 853 return JNI_OK; | |
| 854 } | |
| 855 | |
|
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856 |
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857 // Reserve the Java heap, which is now the same for all GCs. |
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858 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { |
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859 // Add in the class metaspace area so the classes in the headers can |
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860 // be compressed the same as instances. |
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861 size_t total_reserved = heap_size + ClassMetaspaceSize; |
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862 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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863 |
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864 ReservedHeapSpace total_rs(total_reserved, alignment, UseLargePages, addr); |
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865 |
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866 if (UseCompressedOops) { |
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867 if (addr != NULL && !total_rs.is_reserved()) { |
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868 // Failed to reserve at specified address - the requested memory |
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869 // region is taken already, for example, by 'java' launcher. |
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870 // Try again to reserver heap higher. |
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871 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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872 |
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873 ReservedHeapSpace total_rs0(total_reserved, alignment, |
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874 UseLargePages, addr); |
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875 |
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876 if (addr != NULL && !total_rs0.is_reserved()) { |
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877 // Failed to reserve at specified address again - give up. |
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878 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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879 assert(addr == NULL, ""); |
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880 |
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881 ReservedHeapSpace total_rs1(total_reserved, alignment, |
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882 UseLargePages, addr); |
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883 total_rs = total_rs1; |
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884 } else { |
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885 total_rs = total_rs0; |
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886 } |
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887 } |
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888 } |
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889 |
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890 if (!total_rs.is_reserved()) { |
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891 vm_exit_during_initialization(err_msg("Could not reserve enough space for object heap %d bytes", total_reserved)); |
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892 return total_rs; |
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893 } |
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894 |
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895 // Split the reserved space into main Java heap and a space for classes |
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896 // so that they can be compressed using the same algorithm as compressed oops |
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897 ReservedSpace heap_rs = total_rs.first_part(heap_size); |
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898 ReservedSpace class_rs = total_rs.last_part(heap_size, alignment); |
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899 Metaspace::initialize_class_space(class_rs); |
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900 return heap_rs; |
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901 } |
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902 |
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903 |
| 0 | 904 // It's the caller's repsonsibility to ensure glitch-freedom |
| 905 // (if required). | |
| 906 void Universe::update_heap_info_at_gc() { | |
| 907 _heap_capacity_at_last_gc = heap()->capacity(); | |
| 908 _heap_used_at_last_gc = heap()->used(); | |
| 909 } | |
| 910 | |
| 911 | |
| 912 | |
| 913 void universe2_init() { | |
| 914 EXCEPTION_MARK; | |
| 915 Universe::genesis(CATCH); | |
| 916 // Although we'd like to verify here that the state of the heap | |
| 917 // is good, we can't because the main thread has not yet added | |
| 918 // itself to the threads list (so, using current interfaces | |
| 919 // we can't "fill" its TLAB), unless TLABs are disabled. | |
| 920 if (VerifyBeforeGC && !UseTLAB && | |
| 921 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
| 922 Universe::heap()->prepare_for_verify(); | |
| 923 Universe::verify(); // make sure we're starting with a clean slate | |
| 924 } | |
| 925 } | |
| 926 | |
| 927 | |
| 928 // This function is defined in JVM.cpp | |
| 929 extern void initialize_converter_functions(); | |
| 930 | |
| 931 bool universe_post_init() { | |
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932 assert(!is_init_completed(), "Error: initialization not yet completed!"); |
| 0 | 933 Universe::_fully_initialized = true; |
| 934 EXCEPTION_MARK; | |
| 935 { ResourceMark rm; | |
| 936 Interpreter::initialize(); // needed for interpreter entry points | |
| 937 if (!UseSharedSpaces) { | |
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938 HandleMark hm(THREAD); |
| 1142 | 939 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); |
| 0 | 940 Universe::reinitialize_vtable_of(ok_h, CHECK_false); |
| 941 Universe::reinitialize_itables(CHECK_false); | |
| 942 } | |
| 943 } | |
| 944 | |
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945 HandleMark hm(THREAD); |
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946 Klass* k; |
| 0 | 947 instanceKlassHandle k_h; |
| 948 // Setup preallocated empty java.lang.Class array | |
| 1142 | 949 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); |
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950 |
| 0 | 951 // Setup preallocated OutOfMemoryError errors |
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952 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); |
| 0 | 953 k_h = instanceKlassHandle(THREAD, k); |
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954 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); |
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955 Universe::_out_of_memory_error_perm_gen = k_h->allocate_instance(CHECK_false); |
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956 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); |
| 0 | 957 Universe::_out_of_memory_error_gc_overhead_limit = |
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958 k_h->allocate_instance(CHECK_false); |
| 0 | 959 |
| 960 // Setup preallocated NullPointerException | |
| 961 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
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962 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); |
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963 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
| 0 | 964 // Setup preallocated ArithmeticException |
| 965 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
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966 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); |
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967 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
| 0 | 968 // Virtual Machine Error for when we get into a situation we can't resolve |
| 969 k = SystemDictionary::resolve_or_fail( | |
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970 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); |
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971 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); |
| 0 | 972 if (!linked) { |
| 973 tty->print_cr("Unable to link/verify VirtualMachineError class"); | |
| 974 return false; // initialization failed | |
| 975 } | |
| 976 Universe::_virtual_machine_error_instance = | |
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977 InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
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978 |
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979 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); |
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980 |
| 0 | 981 if (!DumpSharedSpaces) { |
| 982 // These are the only Java fields that are currently set during shared space dumping. | |
| 983 // We prefer to not handle this generally, so we always reinitialize these detail messages. | |
| 984 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); | |
| 985 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); | |
| 986 | |
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987 msg = java_lang_String::create_from_str("Metadata space", CHECK_false); |
| 0 | 988 java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg()); |
| 989 | |
| 990 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); | |
| 991 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); | |
| 992 | |
| 993 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); | |
| 994 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); | |
| 995 | |
| 996 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); | |
| 997 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); | |
| 998 | |
| 999 // Setup the array of errors that have preallocated backtrace | |
| 1000 k = Universe::_out_of_memory_error_java_heap->klass(); | |
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1001 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); |
| 0 | 1002 k_h = instanceKlassHandle(THREAD, k); |
| 1003 | |
| 1004 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; | |
| 1005 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); | |
| 1006 for (int i=0; i<len; i++) { | |
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1007 oop err = k_h->allocate_instance(CHECK_false); |
| 0 | 1008 Handle err_h = Handle(THREAD, err); |
| 1009 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); | |
| 1010 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); | |
| 1011 } | |
| 1012 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; | |
| 1013 } | |
| 1014 | |
| 1015 | |
| 1016 // Setup static method for registering finalizers | |
| 1017 // The finalizer klass must be linked before looking up the method, in | |
| 1018 // case it needs to get rewritten. | |
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1019 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); |
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1020 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( |
| 0 | 1021 vmSymbols::register_method_name(), |
| 1022 vmSymbols::register_method_signature()); | |
| 1023 if (m == NULL || !m->is_static()) { | |
| 1024 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
| 1025 "java.lang.ref.Finalizer.register", false); | |
| 1026 } | |
| 1027 Universe::_finalizer_register_cache->init( | |
| 1142 | 1028 SystemDictionary::Finalizer_klass(), m, CHECK_false); |
| 0 | 1029 |
| 1030 // Resolve on first use and initialize class. | |
| 1031 // Note: No race-condition here, since a resolve will always return the same result | |
| 1032 | |
| 1033 // Setup method for security checks | |
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1034 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_reflect_Method(), true, CHECK_false); |
| 0 | 1035 k_h = instanceKlassHandle(THREAD, k); |
| 1036 k_h->link_class(CHECK_false); | |
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1037 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_object_array_object_signature()); |
| 0 | 1038 if (m == NULL || m->is_static()) { |
| 1039 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
| 1040 "java.lang.reflect.Method.invoke", false); | |
| 1041 } | |
| 1042 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false); | |
| 1043 | |
| 1044 // The folowing is initializing converter functions for serialization in | |
| 1045 // JVM.cpp. If we clean up the StrictMath code above we may want to find | |
| 1046 // a better solution for this as well. | |
| 1047 initialize_converter_functions(); | |
| 1048 | |
| 1049 // This needs to be done before the first scavenge/gc, since | |
| 1050 // it's an input to soft ref clearing policy. | |
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1051 { |
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1052 MutexLocker x(Heap_lock); |
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1053 Universe::update_heap_info_at_gc(); |
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1054 } |
| 0 | 1055 |
| 1056 // ("weak") refs processing infrastructure initialization | |
| 1057 Universe::heap()->post_initialize(); | |
| 1058 | |
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1059 // Initialize performance counters for metaspaces |
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1060 MetaspaceCounters::initialize_performance_counters(); |
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1061 |
| 0 | 1062 GC_locker::unlock(); // allow gc after bootstrapping |
| 1063 | |
| 1064 MemoryService::set_universe_heap(Universe::_collectedHeap); | |
| 1065 return true; | |
| 1066 } | |
| 1067 | |
| 1068 | |
| 1069 void Universe::compute_base_vtable_size() { | |
| 1070 _base_vtable_size = ClassLoader::compute_Object_vtable(); | |
| 1071 } | |
| 1072 | |
| 1073 | |
| 1074 // %%% The Universe::flush_foo methods belong in CodeCache. | |
| 1075 | |
| 1076 // Flushes compiled methods dependent on dependee. | |
| 1077 void Universe::flush_dependents_on(instanceKlassHandle dependee) { | |
| 1078 assert_lock_strong(Compile_lock); | |
| 1079 | |
| 1080 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
| 1081 | |
| 1082 // CodeCache can only be updated by a thread_in_VM and they will all be | |
| 1083 // stopped dring the safepoint so CodeCache will be safe to update without | |
| 1084 // holding the CodeCache_lock. | |
| 1085 | |
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1086 KlassDepChange changes(dependee); |
| 0 | 1087 |
| 1088 // Compute the dependent nmethods | |
| 1089 if (CodeCache::mark_for_deoptimization(changes) > 0) { | |
| 1090 // At least one nmethod has been marked for deoptimization | |
| 1091 VM_Deoptimize op; | |
| 1092 VMThread::execute(&op); | |
| 1093 } | |
| 1094 } | |
| 1095 | |
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1096 // Flushes compiled methods dependent on a particular CallSite |
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1097 // instance when its target is different than the given MethodHandle. |
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1098 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) { |
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1099 assert_lock_strong(Compile_lock); |
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1100 |
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1101 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; |
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1102 |
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1103 // CodeCache can only be updated by a thread_in_VM and they will all be |
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1104 // stopped dring the safepoint so CodeCache will be safe to update without |
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1105 // holding the CodeCache_lock. |
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1106 |
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1107 CallSiteDepChange changes(call_site(), method_handle()); |
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1108 |
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1109 // Compute the dependent nmethods that have a reference to a |
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1110 // CallSite object. We use InstanceKlass::mark_dependent_nmethod |
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1111 // directly instead of CodeCache::mark_for_deoptimization because we |
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1112 // want dependents on the call site class only not all classes in |
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1113 // the ContextStream. |
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1114 int marked = 0; |
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1115 { |
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1116 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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1117 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass()); |
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1118 marked = call_site_klass->mark_dependent_nmethods(changes); |
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1119 } |
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1120 if (marked > 0) { |
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1121 // At least one nmethod has been marked for deoptimization |
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1122 VM_Deoptimize op; |
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1123 VMThread::execute(&op); |
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1124 } |
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1125 } |
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1126 |
| 0 | 1127 #ifdef HOTSWAP |
| 1128 // Flushes compiled methods dependent on dependee in the evolutionary sense | |
| 1129 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { | |
| 1130 // --- Compile_lock is not held. However we are at a safepoint. | |
| 1131 assert_locked_or_safepoint(Compile_lock); | |
| 1132 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
| 1133 | |
| 1134 // CodeCache can only be updated by a thread_in_VM and they will all be | |
| 1135 // stopped dring the safepoint so CodeCache will be safe to update without | |
| 1136 // holding the CodeCache_lock. | |
| 1137 | |
| 1138 // Compute the dependent nmethods | |
| 1139 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { | |
| 1140 // At least one nmethod has been marked for deoptimization | |
| 1141 | |
| 1142 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
| 1143 // Stuff copied from VM_Deoptimize and modified slightly. | |
| 1144 | |
| 1145 // We do not want any GCs to happen while we are in the middle of this VM operation | |
| 1146 ResourceMark rm; | |
| 1147 DeoptimizationMarker dm; | |
| 1148 | |
| 1149 // Deoptimize all activations depending on marked nmethods | |
| 1150 Deoptimization::deoptimize_dependents(); | |
| 1151 | |
| 1152 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
| 1153 CodeCache::make_marked_nmethods_not_entrant(); | |
| 1154 } | |
| 1155 } | |
| 1156 #endif // HOTSWAP | |
| 1157 | |
| 1158 | |
| 1159 // Flushes compiled methods dependent on dependee | |
| 1160 void Universe::flush_dependents_on_method(methodHandle m_h) { | |
| 1161 // --- Compile_lock is not held. However we are at a safepoint. | |
| 1162 assert_locked_or_safepoint(Compile_lock); | |
| 1163 | |
| 1164 // CodeCache can only be updated by a thread_in_VM and they will all be | |
| 1165 // stopped dring the safepoint so CodeCache will be safe to update without | |
| 1166 // holding the CodeCache_lock. | |
| 1167 | |
| 1168 // Compute the dependent nmethods | |
| 1169 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { | |
| 1170 // At least one nmethod has been marked for deoptimization | |
| 1171 | |
| 1172 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
| 1173 // Stuff copied from VM_Deoptimize and modified slightly. | |
| 1174 | |
| 1175 // We do not want any GCs to happen while we are in the middle of this VM operation | |
| 1176 ResourceMark rm; | |
| 1177 DeoptimizationMarker dm; | |
| 1178 | |
| 1179 // Deoptimize all activations depending on marked nmethods | |
| 1180 Deoptimization::deoptimize_dependents(); | |
| 1181 | |
| 1182 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
| 1183 CodeCache::make_marked_nmethods_not_entrant(); | |
| 1184 } | |
| 1185 } | |
| 1186 | |
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1187 void Universe::print() { |
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1188 print_on(gclog_or_tty); |
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1189 } |
| 0 | 1190 |
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1191 void Universe::print_on(outputStream* st, bool extended) { |
| 0 | 1192 st->print_cr("Heap"); |
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1193 if (!extended) { |
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1194 heap()->print_on(st); |
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1195 } else { |
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1196 heap()->print_extended_on(st); |
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1197 } |
| 0 | 1198 } |
| 1199 | |
| 1200 void Universe::print_heap_at_SIGBREAK() { | |
| 1201 if (PrintHeapAtSIGBREAK) { | |
| 1202 MutexLocker hl(Heap_lock); | |
| 1203 print_on(tty); | |
| 1204 tty->cr(); | |
| 1205 tty->flush(); | |
| 1206 } | |
| 1207 } | |
| 1208 | |
| 4944 | 1209 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { |
| 0 | 1210 st->print_cr("{Heap before GC invocations=%u (full %u):", |
| 1211 heap()->total_collections(), | |
| 1212 heap()->total_full_collections()); | |
| 4944 | 1213 if (!PrintHeapAtGCExtended || ignore_extended) { |
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1214 heap()->print_on(st); |
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1215 } else { |
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1216 heap()->print_extended_on(st); |
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1217 } |
| 0 | 1218 } |
| 1219 | |
| 4944 | 1220 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { |
| 0 | 1221 st->print_cr("Heap after GC invocations=%u (full %u):", |
| 1222 heap()->total_collections(), | |
| 1223 heap()->total_full_collections()); | |
| 4944 | 1224 if (!PrintHeapAtGCExtended || ignore_extended) { |
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1225 heap()->print_on(st); |
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1226 } else { |
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1227 heap()->print_extended_on(st); |
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1228 } |
| 0 | 1229 st->print_cr("}"); |
| 1230 } | |
| 1231 | |
| 6008 | 1232 void Universe::verify(bool silent, VerifyOption option) { |
| 0 | 1233 if (SharedSkipVerify) { |
| 1234 return; | |
| 1235 } | |
| 1236 | |
| 1237 // The use of _verify_in_progress is a temporary work around for | |
| 1238 // 6320749. Don't bother with a creating a class to set and clear | |
| 1239 // it since it is only used in this method and the control flow is | |
| 1240 // straight forward. | |
| 1241 _verify_in_progress = true; | |
| 1242 | |
| 1243 COMPILER2_PRESENT( | |
| 1244 assert(!DerivedPointerTable::is_active(), | |
| 1245 "DPT should not be active during verification " | |
| 1246 "(of thread stacks below)"); | |
| 1247 ) | |
| 1248 | |
| 1249 ResourceMark rm; | |
| 1250 HandleMark hm; // Handles created during verification can be zapped | |
| 1251 _verify_count++; | |
| 1252 | |
| 1253 if (!silent) gclog_or_tty->print("[Verifying "); | |
| 1254 if (!silent) gclog_or_tty->print("threads "); | |
| 1255 Threads::verify(); | |
| 6008 | 1256 heap()->verify(silent, option); |
| 0 | 1257 |
| 1258 if (!silent) gclog_or_tty->print("syms "); | |
| 1259 SymbolTable::verify(); | |
| 1260 if (!silent) gclog_or_tty->print("strs "); | |
| 1261 StringTable::verify(); | |
| 1262 { | |
| 1263 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 1264 if (!silent) gclog_or_tty->print("zone "); | |
| 1265 CodeCache::verify(); | |
| 1266 } | |
| 1267 if (!silent) gclog_or_tty->print("dict "); | |
| 1268 SystemDictionary::verify(); | |
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1269 #ifndef PRODUCT |
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1270 if (!silent) gclog_or_tty->print("cldg "); |
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1271 ClassLoaderDataGraph::verify(); |
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1272 #endif |
| 0 | 1273 if (!silent) gclog_or_tty->print("hand "); |
| 1274 JNIHandles::verify(); | |
| 1275 if (!silent) gclog_or_tty->print("C-heap "); | |
| 1276 os::check_heap(); | |
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1277 if (!silent) gclog_or_tty->print("code cache "); |
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1278 CodeCache::verify_oops(); |
| 0 | 1279 if (!silent) gclog_or_tty->print_cr("]"); |
| 1280 | |
| 1281 _verify_in_progress = false; | |
| 1282 } | |
| 1283 | |
| 1284 // Oop verification (see MacroAssembler::verify_oop) | |
| 1285 | |
| 1286 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; | |
| 1287 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; | |
| 1288 | |
| 1289 | |
| 1290 static void calculate_verify_data(uintptr_t verify_data[2], | |
| 1291 HeapWord* low_boundary, | |
| 1292 HeapWord* high_boundary) { | |
| 1293 assert(low_boundary < high_boundary, "bad interval"); | |
| 1294 | |
| 1295 // decide which low-order bits we require to be clear: | |
| 1296 size_t alignSize = MinObjAlignmentInBytes; | |
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1297 size_t min_object_size = CollectedHeap::min_fill_size(); |
| 0 | 1298 |
| 1299 // make an inclusive limit: | |
| 1300 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; | |
| 1301 uintptr_t min = (uintptr_t)low_boundary; | |
| 1302 assert(min < max, "bad interval"); | |
| 1303 uintptr_t diff = max ^ min; | |
| 1304 | |
| 1305 // throw away enough low-order bits to make the diff vanish | |
| 1306 uintptr_t mask = (uintptr_t)(-1); | |
| 1307 while ((mask & diff) != 0) | |
| 1308 mask <<= 1; | |
| 1309 uintptr_t bits = (min & mask); | |
| 1310 assert(bits == (max & mask), "correct mask"); | |
| 1311 // check an intermediate value between min and max, just to make sure: | |
| 1312 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); | |
| 1313 | |
| 1314 // require address alignment, too: | |
| 1315 mask |= (alignSize - 1); | |
| 1316 | |
| 1317 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { | |
| 1318 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); | |
| 1319 } | |
| 1320 verify_data[0] = mask; | |
| 1321 verify_data[1] = bits; | |
| 1322 } | |
| 1323 | |
| 1324 | |
| 1325 // Oop verification (see MacroAssembler::verify_oop) | |
| 1326 #ifndef PRODUCT | |
| 1327 | |
| 1328 uintptr_t Universe::verify_oop_mask() { | |
| 1329 MemRegion m = heap()->reserved_region(); | |
| 1330 calculate_verify_data(_verify_oop_data, | |
| 1331 m.start(), | |
| 1332 m.end()); | |
| 1333 return _verify_oop_data[0]; | |
| 1334 } | |
| 1335 | |
| 1336 | |
| 1337 | |
| 1338 uintptr_t Universe::verify_oop_bits() { | |
| 1339 verify_oop_mask(); | |
| 1340 return _verify_oop_data[1]; | |
| 1341 } | |
| 1342 | |
| 1343 uintptr_t Universe::verify_mark_mask() { | |
| 1344 return markOopDesc::lock_mask_in_place; | |
| 1345 } | |
| 1346 | |
| 1347 uintptr_t Universe::verify_mark_bits() { | |
| 1348 intptr_t mask = verify_mark_mask(); | |
| 1349 intptr_t bits = (intptr_t)markOopDesc::prototype(); | |
| 1350 assert((bits & ~mask) == 0, "no stray header bits"); | |
| 1351 return bits; | |
| 1352 } | |
| 1353 #endif // PRODUCT | |
| 1354 | |
| 1355 | |
| 1356 void Universe::compute_verify_oop_data() { | |
| 1357 verify_oop_mask(); | |
| 1358 verify_oop_bits(); | |
| 1359 verify_mark_mask(); | |
| 1360 verify_mark_bits(); | |
| 1361 } | |
| 1362 | |
| 1363 | |
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1364 void CommonMethodOopCache::init(Klass* k, Method* m, TRAPS) { |
| 0 | 1365 if (!UseSharedSpaces) { |
| 1366 _klass = k; | |
| 1367 } | |
| 1368 #ifndef PRODUCT | |
| 1369 else { | |
| 1370 // sharing initilization should have already set up _klass | |
| 1371 assert(_klass != NULL, "just checking"); | |
| 1372 } | |
| 1373 #endif | |
| 1374 | |
| 1375 _method_idnum = m->method_idnum(); | |
| 1376 assert(_method_idnum >= 0, "sanity check"); | |
| 1377 } | |
| 1378 | |
| 1379 | |
| 1380 ActiveMethodOopsCache::~ActiveMethodOopsCache() { | |
| 1381 if (_prev_methods != NULL) { | |
| 1382 delete _prev_methods; | |
| 1383 _prev_methods = NULL; | |
| 1384 } | |
| 1385 } | |
| 1386 | |
| 1387 | |
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1388 void ActiveMethodOopsCache::add_previous_version(Method* const method) { |
| 0 | 1389 assert(Thread::current()->is_VM_thread(), |
| 1390 "only VMThread can add previous versions"); | |
| 1391 | |
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1392 // Only append the previous method if it is executing on the stack. |
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1393 if (method->on_stack()) { |
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1394 |
| 0 | 1395 if (_prev_methods == NULL) { |
| 1396 // This is the first previous version so make some space. | |
| 1397 // Start with 2 elements under the assumption that the class | |
| 1398 // won't be redefined much. | |
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1399 _prev_methods = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Method*>(2, true); |
| 0 | 1400 } |
| 1401 | |
| 1402 // RC_TRACE macro has an embedded ResourceMark | |
| 1403 RC_TRACE(0x00000100, | |
| 1404 ("add: %s(%s): adding prev version ref for cached method @%d", | |
| 1405 method->name()->as_C_string(), method->signature()->as_C_string(), | |
| 1406 _prev_methods->length())); | |
| 1407 | |
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1408 _prev_methods->append(method); |
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1409 } |
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1410 |
| 0 | 1411 |
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1412 // Since the caller is the VMThread and we are at a safepoint, this is a good |
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1413 // time to clear out unused method references. |
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1414 |
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1415 if (_prev_methods == NULL) return; |
| 0 | 1416 |
| 1417 for (int i = _prev_methods->length() - 1; i >= 0; i--) { | |
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1418 Method* method = _prev_methods->at(i); |
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1419 assert(method != NULL, "weak method ref was unexpectedly cleared"); |
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1420 |
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1421 if (!method->on_stack()) { |
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1422 // This method isn't running anymore so remove it |
| 0 | 1423 _prev_methods->remove_at(i); |
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1424 MetadataFactory::free_metadata(method->method_holder()->class_loader_data(), method); |
| 0 | 1425 } else { |
| 1426 // RC_TRACE macro has an embedded ResourceMark | |
| 1427 RC_TRACE(0x00000400, ("add: %s(%s): previous cached method @%d is alive", | |
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1428 method->name()->as_C_string(), method->signature()->as_C_string(), i)); |
| 0 | 1429 } |
| 1430 } | |
| 1431 } // end add_previous_version() | |
| 1432 | |
| 1433 | |
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1434 bool ActiveMethodOopsCache::is_same_method(Method* const method) const { |
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1435 InstanceKlass* ik = InstanceKlass::cast(klass()); |
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1436 Method* check_method = ik->method_with_idnum(method_idnum()); |
| 0 | 1437 assert(check_method != NULL, "sanity check"); |
| 1438 if (check_method == method) { | |
| 1439 // done with the easy case | |
| 1440 return true; | |
| 1441 } | |
| 1442 | |
| 1443 if (_prev_methods != NULL) { | |
| 1444 // The cached method has been redefined at least once so search | |
| 1445 // the previous versions for a match. | |
| 1446 for (int i = 0; i < _prev_methods->length(); i++) { | |
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1447 check_method = _prev_methods->at(i); |
| 0 | 1448 if (check_method == method) { |
| 1449 // a previous version matches | |
| 1450 return true; | |
| 1451 } | |
| 1452 } | |
| 1453 } | |
| 1454 | |
| 1455 // either no previous versions or no previous version matched | |
| 1456 return false; | |
| 1457 } | |
| 1458 | |
| 1459 | |
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1460 Method* LatestMethodOopCache::get_Method() { |
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1461 InstanceKlass* ik = InstanceKlass::cast(klass()); |
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1462 Method* m = ik->method_with_idnum(method_idnum()); |
| 0 | 1463 assert(m != NULL, "sanity check"); |
| 1464 return m; | |
| 1465 } | |
| 1466 | |
| 1467 | |
| 1468 #ifdef ASSERT | |
| 1469 // Release dummy object(s) at bottom of heap | |
| 1470 bool Universe::release_fullgc_alot_dummy() { | |
| 1471 MutexLocker ml(FullGCALot_lock); | |
| 1472 if (_fullgc_alot_dummy_array != NULL) { | |
| 1473 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { | |
| 1474 // No more dummies to release, release entire array instead | |
| 1475 _fullgc_alot_dummy_array = NULL; | |
| 1476 return false; | |
| 1477 } | |
| 1478 if (!UseConcMarkSweepGC) { | |
| 1479 // Release dummy at bottom of old generation | |
| 1480 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
| 1481 } | |
| 1482 // Release dummy at bottom of permanent generation | |
| 1483 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
| 1484 } | |
| 1485 return true; | |
| 1486 } | |
| 1487 | |
| 1488 #endif // ASSERT |