Mercurial > hg > truffle
annotate src/share/vm/memory/universe.cpp @ 2139:75efcee5ac47
6966589: hs16-b08 causes java.lang.StackOverflowError
Reviewed-by: mchung, dholmes, chrisphi
author | minqi |
---|---|
date | Thu, 07 Oct 2010 13:49:40 -0700 |
parents | c04052fd6ae1 |
children | 3582bf76420e |
rev | line source |
---|---|
0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1507
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1507
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1507
diff
changeset
|
21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/symbolTable.hpp" | |
29 #include "classfile/systemDictionary.hpp" | |
30 #include "classfile/vmSymbols.hpp" | |
31 #include "code/codeCache.hpp" | |
32 #include "code/dependencies.hpp" | |
33 #include "gc_interface/collectedHeap.inline.hpp" | |
34 #include "interpreter/interpreter.hpp" | |
35 #include "memory/cardTableModRefBS.hpp" | |
36 #include "memory/filemap.hpp" | |
37 #include "memory/gcLocker.inline.hpp" | |
38 #include "memory/genCollectedHeap.hpp" | |
39 #include "memory/genRemSet.hpp" | |
40 #include "memory/generation.hpp" | |
41 #include "memory/oopFactory.hpp" | |
42 #include "memory/permGen.hpp" | |
43 #include "memory/space.hpp" | |
44 #include "memory/universe.hpp" | |
45 #include "memory/universe.inline.hpp" | |
46 #include "oops/arrayKlassKlass.hpp" | |
47 #include "oops/compiledICHolderKlass.hpp" | |
48 #include "oops/constMethodKlass.hpp" | |
49 #include "oops/constantPoolKlass.hpp" | |
50 #include "oops/constantPoolOop.hpp" | |
51 #include "oops/cpCacheKlass.hpp" | |
52 #include "oops/cpCacheOop.hpp" | |
53 #include "oops/instanceKlass.hpp" | |
54 #include "oops/instanceKlassKlass.hpp" | |
55 #include "oops/instanceRefKlass.hpp" | |
56 #include "oops/klassKlass.hpp" | |
57 #include "oops/klassOop.hpp" | |
58 #include "oops/methodDataKlass.hpp" | |
59 #include "oops/methodKlass.hpp" | |
60 #include "oops/objArrayKlassKlass.hpp" | |
61 #include "oops/oop.inline.hpp" | |
62 #include "oops/symbolKlass.hpp" | |
63 #include "oops/typeArrayKlass.hpp" | |
64 #include "oops/typeArrayKlassKlass.hpp" | |
65 #include "prims/jvmtiRedefineClassesTrace.hpp" | |
66 #include "runtime/aprofiler.hpp" | |
67 #include "runtime/arguments.hpp" | |
68 #include "runtime/deoptimization.hpp" | |
69 #include "runtime/fprofiler.hpp" | |
70 #include "runtime/handles.inline.hpp" | |
71 #include "runtime/init.hpp" | |
72 #include "runtime/java.hpp" | |
73 #include "runtime/javaCalls.hpp" | |
74 #include "runtime/sharedRuntime.hpp" | |
75 #include "runtime/synchronizer.hpp" | |
76 #include "runtime/timer.hpp" | |
77 #include "runtime/vm_operations.hpp" | |
78 #include "services/memoryService.hpp" | |
79 #include "utilities/copy.hpp" | |
80 #include "utilities/events.hpp" | |
81 #include "utilities/hashtable.inline.hpp" | |
82 #include "utilities/preserveException.hpp" | |
83 #ifdef TARGET_OS_FAMILY_linux | |
84 # include "thread_linux.inline.hpp" | |
85 #endif | |
86 #ifdef TARGET_OS_FAMILY_solaris | |
87 # include "thread_solaris.inline.hpp" | |
88 #endif | |
89 #ifdef TARGET_OS_FAMILY_windows | |
90 # include "thread_windows.inline.hpp" | |
91 #endif | |
92 #ifndef SERIALGC | |
93 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" | |
94 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp" | |
95 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
96 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
97 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
98 #endif | |
0 | 99 |
100 // Known objects | |
101 klassOop Universe::_boolArrayKlassObj = NULL; | |
102 klassOop Universe::_byteArrayKlassObj = NULL; | |
103 klassOop Universe::_charArrayKlassObj = NULL; | |
104 klassOop Universe::_intArrayKlassObj = NULL; | |
105 klassOop Universe::_shortArrayKlassObj = NULL; | |
106 klassOop Universe::_longArrayKlassObj = NULL; | |
107 klassOop Universe::_singleArrayKlassObj = NULL; | |
108 klassOop Universe::_doubleArrayKlassObj = NULL; | |
109 klassOop Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; | |
110 klassOop Universe::_objectArrayKlassObj = NULL; | |
111 klassOop Universe::_symbolKlassObj = NULL; | |
112 klassOop Universe::_methodKlassObj = NULL; | |
113 klassOop Universe::_constMethodKlassObj = NULL; | |
114 klassOop Universe::_methodDataKlassObj = NULL; | |
115 klassOop Universe::_klassKlassObj = NULL; | |
116 klassOop Universe::_arrayKlassKlassObj = NULL; | |
117 klassOop Universe::_objArrayKlassKlassObj = NULL; | |
118 klassOop Universe::_typeArrayKlassKlassObj = NULL; | |
119 klassOop Universe::_instanceKlassKlassObj = NULL; | |
120 klassOop Universe::_constantPoolKlassObj = NULL; | |
121 klassOop Universe::_constantPoolCacheKlassObj = NULL; | |
122 klassOop Universe::_compiledICHolderKlassObj = NULL; | |
123 klassOop Universe::_systemObjArrayKlassObj = NULL; | |
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
453
diff
changeset
|
124 oop Universe::_int_mirror = NULL; |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
453
diff
changeset
|
125 oop Universe::_float_mirror = NULL; |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
453
diff
changeset
|
126 oop Universe::_double_mirror = NULL; |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
453
diff
changeset
|
127 oop Universe::_byte_mirror = NULL; |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
453
diff
changeset
|
128 oop Universe::_bool_mirror = NULL; |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
453
diff
changeset
|
129 oop Universe::_char_mirror = NULL; |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
453
diff
changeset
|
130 oop Universe::_long_mirror = NULL; |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
453
diff
changeset
|
131 oop Universe::_short_mirror = NULL; |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
453
diff
changeset
|
132 oop Universe::_void_mirror = NULL; |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
453
diff
changeset
|
133 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; |
0 | 134 oop Universe::_main_thread_group = NULL; |
135 oop Universe::_system_thread_group = NULL; | |
136 typeArrayOop Universe::_the_empty_byte_array = NULL; | |
137 typeArrayOop Universe::_the_empty_short_array = NULL; | |
138 typeArrayOop Universe::_the_empty_int_array = NULL; | |
139 objArrayOop Universe::_the_empty_system_obj_array = NULL; | |
140 objArrayOop Universe::_the_empty_class_klass_array = NULL; | |
141 objArrayOop Universe::_the_array_interfaces_array = NULL; | |
1080
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
1057
diff
changeset
|
142 oop Universe::_the_null_string = NULL; |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
1057
diff
changeset
|
143 oop Universe::_the_min_jint_string = NULL; |
0 | 144 LatestMethodOopCache* Universe::_finalizer_register_cache = NULL; |
145 LatestMethodOopCache* Universe::_loader_addClass_cache = NULL; | |
146 ActiveMethodOopsCache* Universe::_reflect_invoke_cache = NULL; | |
147 oop Universe::_out_of_memory_error_java_heap = NULL; | |
148 oop Universe::_out_of_memory_error_perm_gen = NULL; | |
149 oop Universe::_out_of_memory_error_array_size = NULL; | |
150 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; | |
151 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; | |
152 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; | |
153 bool Universe::_verify_in_progress = false; | |
154 oop Universe::_null_ptr_exception_instance = NULL; | |
155 oop Universe::_arithmetic_exception_instance = NULL; | |
156 oop Universe::_virtual_machine_error_instance = NULL; | |
157 oop Universe::_vm_exception = NULL; | |
158 oop Universe::_emptySymbol = NULL; | |
159 | |
160 // These variables are guarded by FullGCALot_lock. | |
161 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) | |
162 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) | |
163 | |
164 | |
165 // Heap | |
166 int Universe::_verify_count = 0; | |
167 | |
168 int Universe::_base_vtable_size = 0; | |
169 bool Universe::_bootstrapping = false; | |
170 bool Universe::_fully_initialized = false; | |
171 | |
172 size_t Universe::_heap_capacity_at_last_gc; | |
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
356
diff
changeset
|
173 size_t Universe::_heap_used_at_last_gc = 0; |
0 | 174 |
175 CollectedHeap* Universe::_collectedHeap = NULL; | |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
176 |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
177 NarrowOopStruct Universe::_narrow_oop = { NULL, 0, true }; |
0 | 178 |
179 | |
180 void Universe::basic_type_classes_do(void f(klassOop)) { | |
181 f(boolArrayKlassObj()); | |
182 f(byteArrayKlassObj()); | |
183 f(charArrayKlassObj()); | |
184 f(intArrayKlassObj()); | |
185 f(shortArrayKlassObj()); | |
186 f(longArrayKlassObj()); | |
187 f(singleArrayKlassObj()); | |
188 f(doubleArrayKlassObj()); | |
189 } | |
190 | |
191 | |
192 void Universe::system_classes_do(void f(klassOop)) { | |
193 f(symbolKlassObj()); | |
194 f(methodKlassObj()); | |
195 f(constMethodKlassObj()); | |
196 f(methodDataKlassObj()); | |
197 f(klassKlassObj()); | |
198 f(arrayKlassKlassObj()); | |
199 f(objArrayKlassKlassObj()); | |
200 f(typeArrayKlassKlassObj()); | |
201 f(instanceKlassKlassObj()); | |
202 f(constantPoolKlassObj()); | |
203 f(systemObjArrayKlassObj()); | |
204 } | |
205 | |
206 void Universe::oops_do(OopClosure* f, bool do_all) { | |
207 | |
208 f->do_oop((oop*) &_int_mirror); | |
209 f->do_oop((oop*) &_float_mirror); | |
210 f->do_oop((oop*) &_double_mirror); | |
211 f->do_oop((oop*) &_byte_mirror); | |
212 f->do_oop((oop*) &_bool_mirror); | |
213 f->do_oop((oop*) &_char_mirror); | |
214 f->do_oop((oop*) &_long_mirror); | |
215 f->do_oop((oop*) &_short_mirror); | |
216 f->do_oop((oop*) &_void_mirror); | |
217 | |
218 // It's important to iterate over these guys even if they are null, | |
219 // since that's how shared heaps are restored. | |
220 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
221 f->do_oop((oop*) &_mirrors[i]); | |
222 } | |
223 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); | |
224 | |
225 // %%% Consider moving those "shared oops" over here with the others. | |
226 f->do_oop((oop*)&_boolArrayKlassObj); | |
227 f->do_oop((oop*)&_byteArrayKlassObj); | |
228 f->do_oop((oop*)&_charArrayKlassObj); | |
229 f->do_oop((oop*)&_intArrayKlassObj); | |
230 f->do_oop((oop*)&_shortArrayKlassObj); | |
231 f->do_oop((oop*)&_longArrayKlassObj); | |
232 f->do_oop((oop*)&_singleArrayKlassObj); | |
233 f->do_oop((oop*)&_doubleArrayKlassObj); | |
234 f->do_oop((oop*)&_objectArrayKlassObj); | |
235 { | |
236 for (int i = 0; i < T_VOID+1; i++) { | |
237 if (_typeArrayKlassObjs[i] != NULL) { | |
238 assert(i >= T_BOOLEAN, "checking"); | |
239 f->do_oop((oop*)&_typeArrayKlassObjs[i]); | |
240 } else if (do_all) { | |
241 f->do_oop((oop*)&_typeArrayKlassObjs[i]); | |
242 } | |
243 } | |
244 } | |
245 f->do_oop((oop*)&_symbolKlassObj); | |
246 f->do_oop((oop*)&_methodKlassObj); | |
247 f->do_oop((oop*)&_constMethodKlassObj); | |
248 f->do_oop((oop*)&_methodDataKlassObj); | |
249 f->do_oop((oop*)&_klassKlassObj); | |
250 f->do_oop((oop*)&_arrayKlassKlassObj); | |
251 f->do_oop((oop*)&_objArrayKlassKlassObj); | |
252 f->do_oop((oop*)&_typeArrayKlassKlassObj); | |
253 f->do_oop((oop*)&_instanceKlassKlassObj); | |
254 f->do_oop((oop*)&_constantPoolKlassObj); | |
255 f->do_oop((oop*)&_constantPoolCacheKlassObj); | |
256 f->do_oop((oop*)&_compiledICHolderKlassObj); | |
257 f->do_oop((oop*)&_systemObjArrayKlassObj); | |
258 f->do_oop((oop*)&_the_empty_byte_array); | |
259 f->do_oop((oop*)&_the_empty_short_array); | |
260 f->do_oop((oop*)&_the_empty_int_array); | |
261 f->do_oop((oop*)&_the_empty_system_obj_array); | |
262 f->do_oop((oop*)&_the_empty_class_klass_array); | |
263 f->do_oop((oop*)&_the_array_interfaces_array); | |
1080
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
1057
diff
changeset
|
264 f->do_oop((oop*)&_the_null_string); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
1057
diff
changeset
|
265 f->do_oop((oop*)&_the_min_jint_string); |
0 | 266 _finalizer_register_cache->oops_do(f); |
267 _loader_addClass_cache->oops_do(f); | |
268 _reflect_invoke_cache->oops_do(f); | |
269 f->do_oop((oop*)&_out_of_memory_error_java_heap); | |
270 f->do_oop((oop*)&_out_of_memory_error_perm_gen); | |
271 f->do_oop((oop*)&_out_of_memory_error_array_size); | |
272 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); | |
273 if (_preallocated_out_of_memory_error_array != (oop)NULL) { // NULL when DumpSharedSpaces | |
274 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); | |
275 } | |
276 f->do_oop((oop*)&_null_ptr_exception_instance); | |
277 f->do_oop((oop*)&_arithmetic_exception_instance); | |
278 f->do_oop((oop*)&_virtual_machine_error_instance); | |
279 f->do_oop((oop*)&_main_thread_group); | |
280 f->do_oop((oop*)&_system_thread_group); | |
281 f->do_oop((oop*)&_vm_exception); | |
282 f->do_oop((oop*)&_emptySymbol); | |
283 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) | |
284 } | |
285 | |
286 | |
287 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { | |
288 if (size < alignment || size % alignment != 0) { | |
289 ResourceMark rm; | |
290 stringStream st; | |
291 st.print("Size of %s (%ld bytes) must be aligned to %ld bytes", name, size, alignment); | |
292 char* error = st.as_string(); | |
293 vm_exit_during_initialization(error); | |
294 } | |
295 } | |
296 | |
297 | |
298 void Universe::genesis(TRAPS) { | |
299 ResourceMark rm; | |
300 { FlagSetting fs(_bootstrapping, true); | |
301 | |
302 { MutexLocker mc(Compile_lock); | |
303 | |
304 // determine base vtable size; without that we cannot create the array klasses | |
305 compute_base_vtable_size(); | |
306 | |
307 if (!UseSharedSpaces) { | |
308 _klassKlassObj = klassKlass::create_klass(CHECK); | |
309 _arrayKlassKlassObj = arrayKlassKlass::create_klass(CHECK); | |
310 | |
311 _objArrayKlassKlassObj = objArrayKlassKlass::create_klass(CHECK); | |
312 _instanceKlassKlassObj = instanceKlassKlass::create_klass(CHECK); | |
313 _typeArrayKlassKlassObj = typeArrayKlassKlass::create_klass(CHECK); | |
314 | |
315 _symbolKlassObj = symbolKlass::create_klass(CHECK); | |
316 | |
317 _emptySymbol = oopFactory::new_symbol("", CHECK); | |
318 | |
319 _boolArrayKlassObj = typeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); | |
320 _charArrayKlassObj = typeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); | |
321 _singleArrayKlassObj = typeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); | |
322 _doubleArrayKlassObj = typeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); | |
323 _byteArrayKlassObj = typeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); | |
324 _shortArrayKlassObj = typeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); | |
325 _intArrayKlassObj = typeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); | |
326 _longArrayKlassObj = typeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); | |
327 | |
328 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; | |
329 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; | |
330 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; | |
331 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; | |
332 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; | |
333 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; | |
334 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; | |
335 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; | |
336 | |
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
453
diff
changeset
|
337 _methodKlassObj = methodKlass::create_klass(CHECK); |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
453
diff
changeset
|
338 _constMethodKlassObj = constMethodKlass::create_klass(CHECK); |
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
453
diff
changeset
|
339 _methodDataKlassObj = methodDataKlass::create_klass(CHECK); |
0 | 340 _constantPoolKlassObj = constantPoolKlass::create_klass(CHECK); |
341 _constantPoolCacheKlassObj = constantPoolCacheKlass::create_klass(CHECK); | |
342 | |
343 _compiledICHolderKlassObj = compiledICHolderKlass::create_klass(CHECK); | |
344 _systemObjArrayKlassObj = objArrayKlassKlass::cast(objArrayKlassKlassObj())->allocate_system_objArray_klass(CHECK); | |
345 | |
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
453
diff
changeset
|
346 _the_empty_byte_array = oopFactory::new_permanent_byteArray(0, CHECK); |
0 | 347 _the_empty_short_array = oopFactory::new_permanent_shortArray(0, CHECK); |
348 _the_empty_int_array = oopFactory::new_permanent_intArray(0, CHECK); | |
349 _the_empty_system_obj_array = oopFactory::new_system_objArray(0, CHECK); | |
350 | |
351 _the_array_interfaces_array = oopFactory::new_system_objArray(2, CHECK); | |
352 _vm_exception = oopFactory::new_symbol("vm exception holder", CHECK); | |
353 } else { | |
354 FileMapInfo *mapinfo = FileMapInfo::current_info(); | |
355 char* buffer = mapinfo->region_base(CompactingPermGenGen::md); | |
356 void** vtbl_list = (void**)buffer; | |
357 init_self_patching_vtbl_list(vtbl_list, | |
358 CompactingPermGenGen::vtbl_list_size); | |
359 } | |
360 } | |
361 | |
362 vmSymbols::initialize(CHECK); | |
363 | |
364 SystemDictionary::initialize(CHECK); | |
365 | |
1142 | 366 klassOop ok = SystemDictionary::Object_klass(); |
0 | 367 |
1080
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
1057
diff
changeset
|
368 _the_null_string = StringTable::intern("null", CHECK); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
1057
diff
changeset
|
369 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); |
7c57aead6d3e
6892658: C2 should optimize some stringbuilder patterns
never
parents:
1057
diff
changeset
|
370 |
0 | 371 if (UseSharedSpaces) { |
372 // Verify shared interfaces array. | |
373 assert(_the_array_interfaces_array->obj_at(0) == | |
1142 | 374 SystemDictionary::Cloneable_klass(), "u3"); |
0 | 375 assert(_the_array_interfaces_array->obj_at(1) == |
1142 | 376 SystemDictionary::Serializable_klass(), "u3"); |
0 | 377 |
378 // Verify element klass for system obj array klass | |
379 assert(objArrayKlass::cast(_systemObjArrayKlassObj)->element_klass() == ok, "u1"); | |
380 assert(objArrayKlass::cast(_systemObjArrayKlassObj)->bottom_klass() == ok, "u2"); | |
381 | |
382 // Verify super class for the classes created above | |
383 assert(Klass::cast(boolArrayKlassObj() )->super() == ok, "u3"); | |
384 assert(Klass::cast(charArrayKlassObj() )->super() == ok, "u3"); | |
385 assert(Klass::cast(singleArrayKlassObj() )->super() == ok, "u3"); | |
386 assert(Klass::cast(doubleArrayKlassObj() )->super() == ok, "u3"); | |
387 assert(Klass::cast(byteArrayKlassObj() )->super() == ok, "u3"); | |
388 assert(Klass::cast(shortArrayKlassObj() )->super() == ok, "u3"); | |
389 assert(Klass::cast(intArrayKlassObj() )->super() == ok, "u3"); | |
390 assert(Klass::cast(longArrayKlassObj() )->super() == ok, "u3"); | |
391 assert(Klass::cast(constantPoolKlassObj() )->super() == ok, "u3"); | |
392 assert(Klass::cast(systemObjArrayKlassObj())->super() == ok, "u3"); | |
393 } else { | |
394 // Set up shared interfaces array. (Do this before supers are set up.) | |
1142 | 395 _the_array_interfaces_array->obj_at_put(0, SystemDictionary::Cloneable_klass()); |
396 _the_array_interfaces_array->obj_at_put(1, SystemDictionary::Serializable_klass()); | |
0 | 397 |
398 // Set element klass for system obj array klass | |
399 objArrayKlass::cast(_systemObjArrayKlassObj)->set_element_klass(ok); | |
400 objArrayKlass::cast(_systemObjArrayKlassObj)->set_bottom_klass(ok); | |
401 | |
402 // Set super class for the classes created above | |
403 Klass::cast(boolArrayKlassObj() )->initialize_supers(ok, CHECK); | |
404 Klass::cast(charArrayKlassObj() )->initialize_supers(ok, CHECK); | |
405 Klass::cast(singleArrayKlassObj() )->initialize_supers(ok, CHECK); | |
406 Klass::cast(doubleArrayKlassObj() )->initialize_supers(ok, CHECK); | |
407 Klass::cast(byteArrayKlassObj() )->initialize_supers(ok, CHECK); | |
408 Klass::cast(shortArrayKlassObj() )->initialize_supers(ok, CHECK); | |
409 Klass::cast(intArrayKlassObj() )->initialize_supers(ok, CHECK); | |
410 Klass::cast(longArrayKlassObj() )->initialize_supers(ok, CHECK); | |
411 Klass::cast(constantPoolKlassObj() )->initialize_supers(ok, CHECK); | |
412 Klass::cast(systemObjArrayKlassObj())->initialize_supers(ok, CHECK); | |
413 Klass::cast(boolArrayKlassObj() )->set_super(ok); | |
414 Klass::cast(charArrayKlassObj() )->set_super(ok); | |
415 Klass::cast(singleArrayKlassObj() )->set_super(ok); | |
416 Klass::cast(doubleArrayKlassObj() )->set_super(ok); | |
417 Klass::cast(byteArrayKlassObj() )->set_super(ok); | |
418 Klass::cast(shortArrayKlassObj() )->set_super(ok); | |
419 Klass::cast(intArrayKlassObj() )->set_super(ok); | |
420 Klass::cast(longArrayKlassObj() )->set_super(ok); | |
421 Klass::cast(constantPoolKlassObj() )->set_super(ok); | |
422 Klass::cast(systemObjArrayKlassObj())->set_super(ok); | |
423 } | |
424 | |
425 Klass::cast(boolArrayKlassObj() )->append_to_sibling_list(); | |
426 Klass::cast(charArrayKlassObj() )->append_to_sibling_list(); | |
427 Klass::cast(singleArrayKlassObj() )->append_to_sibling_list(); | |
428 Klass::cast(doubleArrayKlassObj() )->append_to_sibling_list(); | |
429 Klass::cast(byteArrayKlassObj() )->append_to_sibling_list(); | |
430 Klass::cast(shortArrayKlassObj() )->append_to_sibling_list(); | |
431 Klass::cast(intArrayKlassObj() )->append_to_sibling_list(); | |
432 Klass::cast(longArrayKlassObj() )->append_to_sibling_list(); | |
433 Klass::cast(constantPoolKlassObj() )->append_to_sibling_list(); | |
434 Klass::cast(systemObjArrayKlassObj())->append_to_sibling_list(); | |
435 } // end of core bootstrapping | |
436 | |
437 // Initialize _objectArrayKlass after core bootstraping to make | |
438 // sure the super class is set up properly for _objectArrayKlass. | |
439 _objectArrayKlassObj = instanceKlass:: | |
1142 | 440 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); |
0 | 441 // Add the class to the class hierarchy manually to make sure that |
442 // its vtable is initialized after core bootstrapping is completed. | |
443 Klass::cast(_objectArrayKlassObj)->append_to_sibling_list(); | |
444 | |
445 // Compute is_jdk version flags. | |
446 // Only 1.3 or later has the java.lang.Shutdown class. | |
447 // Only 1.4 or later has the java.lang.CharSequence interface. | |
448 // Only 1.5 or later has the java.lang.management.MemoryUsage class. | |
242 | 449 if (JDK_Version::is_partially_initialized()) { |
450 uint8_t jdk_version; | |
451 klassOop k = SystemDictionary::resolve_or_null( | |
452 vmSymbolHandles::java_lang_management_MemoryUsage(), THREAD); | |
0 | 453 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
454 if (k == NULL) { | |
242 | 455 k = SystemDictionary::resolve_or_null( |
456 vmSymbolHandles::java_lang_CharSequence(), THREAD); | |
0 | 457 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
458 if (k == NULL) { | |
242 | 459 k = SystemDictionary::resolve_or_null( |
460 vmSymbolHandles::java_lang_Shutdown(), THREAD); | |
0 | 461 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
462 if (k == NULL) { | |
242 | 463 jdk_version = 2; |
0 | 464 } else { |
242 | 465 jdk_version = 3; |
0 | 466 } |
467 } else { | |
242 | 468 jdk_version = 4; |
0 | 469 } |
470 } else { | |
242 | 471 jdk_version = 5; |
0 | 472 } |
242 | 473 JDK_Version::fully_initialize(jdk_version); |
0 | 474 } |
475 | |
476 #ifdef ASSERT | |
477 if (FullGCALot) { | |
478 // Allocate an array of dummy objects. | |
479 // We'd like these to be at the bottom of the old generation, | |
480 // so that when we free one and then collect, | |
481 // (almost) the whole heap moves | |
482 // and we find out if we actually update all the oops correctly. | |
483 // But we can't allocate directly in the old generation, | |
484 // so we allocate wherever, and hope that the first collection | |
485 // moves these objects to the bottom of the old generation. | |
486 // We can allocate directly in the permanent generation, so we do. | |
487 int size; | |
488 if (UseConcMarkSweepGC) { | |
489 warning("Using +FullGCALot with concurrent mark sweep gc " | |
490 "will not force all objects to relocate"); | |
491 size = FullGCALotDummies; | |
492 } else { | |
493 size = FullGCALotDummies * 2; | |
494 } | |
495 objArrayOop naked_array = oopFactory::new_system_objArray(size, CHECK); | |
496 objArrayHandle dummy_array(THREAD, naked_array); | |
497 int i = 0; | |
498 while (i < size) { | |
499 if (!UseConcMarkSweepGC) { | |
500 // Allocate dummy in old generation | |
1142 | 501 oop dummy = instanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); |
0 | 502 dummy_array->obj_at_put(i++, dummy); |
503 } | |
504 // Allocate dummy in permanent generation | |
1142 | 505 oop dummy = instanceKlass::cast(SystemDictionary::Object_klass())->allocate_permanent_instance(CHECK); |
0 | 506 dummy_array->obj_at_put(i++, dummy); |
507 } | |
508 { | |
509 // Only modify the global variable inside the mutex. | |
510 // If we had a race to here, the other dummy_array instances | |
511 // and their elements just get dropped on the floor, which is fine. | |
512 MutexLocker ml(FullGCALot_lock); | |
513 if (_fullgc_alot_dummy_array == NULL) { | |
514 _fullgc_alot_dummy_array = dummy_array(); | |
515 } | |
516 } | |
517 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); | |
518 } | |
519 #endif | |
520 } | |
521 | |
522 | |
523 static inline void add_vtable(void** list, int* n, Klass* o, int count) { | |
524 list[(*n)++] = *(void**)&o->vtbl_value(); | |
525 guarantee((*n) <= count, "vtable list too small."); | |
526 } | |
527 | |
528 | |
529 void Universe::init_self_patching_vtbl_list(void** list, int count) { | |
530 int n = 0; | |
531 { klassKlass o; add_vtable(list, &n, &o, count); } | |
532 { arrayKlassKlass o; add_vtable(list, &n, &o, count); } | |
533 { objArrayKlassKlass o; add_vtable(list, &n, &o, count); } | |
534 { instanceKlassKlass o; add_vtable(list, &n, &o, count); } | |
535 { instanceKlass o; add_vtable(list, &n, &o, count); } | |
536 { instanceRefKlass o; add_vtable(list, &n, &o, count); } | |
537 { typeArrayKlassKlass o; add_vtable(list, &n, &o, count); } | |
538 { symbolKlass o; add_vtable(list, &n, &o, count); } | |
539 { typeArrayKlass o; add_vtable(list, &n, &o, count); } | |
540 { methodKlass o; add_vtable(list, &n, &o, count); } | |
541 { constMethodKlass o; add_vtable(list, &n, &o, count); } | |
542 { constantPoolKlass o; add_vtable(list, &n, &o, count); } | |
543 { constantPoolCacheKlass o; add_vtable(list, &n, &o, count); } | |
544 { objArrayKlass o; add_vtable(list, &n, &o, count); } | |
545 { methodDataKlass o; add_vtable(list, &n, &o, count); } | |
546 { compiledICHolderKlass o; add_vtable(list, &n, &o, count); } | |
547 } | |
548 | |
549 | |
550 class FixupMirrorClosure: public ObjectClosure { | |
551 public: | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
552 virtual void do_object(oop obj) { |
0 | 553 if (obj->is_klass()) { |
554 EXCEPTION_MARK; | |
555 KlassHandle k(THREAD, klassOop(obj)); | |
556 // We will never reach the CATCH below since Exceptions::_throw will cause | |
557 // the VM to exit if an exception is thrown during initialization | |
558 java_lang_Class::create_mirror(k, CATCH); | |
559 // This call unconditionally creates a new mirror for k, | |
560 // and links in k's component_mirror field if k is an array. | |
561 // If k is an objArray, k's element type must already have | |
562 // a mirror. In other words, this closure must process | |
563 // the component type of an objArray k before it processes k. | |
564 // This works because the permgen iterator presents arrays | |
565 // and their component types in order of creation. | |
566 } | |
567 } | |
568 }; | |
569 | |
570 void Universe::initialize_basic_type_mirrors(TRAPS) { | |
571 if (UseSharedSpaces) { | |
572 assert(_int_mirror != NULL, "already loaded"); | |
573 assert(_void_mirror == _mirrors[T_VOID], "consistently loaded"); | |
574 } else { | |
575 | |
576 assert(_int_mirror==NULL, "basic type mirrors already initialized"); | |
577 _int_mirror = | |
578 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); | |
579 _float_mirror = | |
580 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); | |
581 _double_mirror = | |
582 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); | |
583 _byte_mirror = | |
584 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); | |
585 _bool_mirror = | |
586 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); | |
587 _char_mirror = | |
588 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); | |
589 _long_mirror = | |
590 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); | |
591 _short_mirror = | |
592 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); | |
593 _void_mirror = | |
594 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); | |
595 | |
596 _mirrors[T_INT] = _int_mirror; | |
597 _mirrors[T_FLOAT] = _float_mirror; | |
598 _mirrors[T_DOUBLE] = _double_mirror; | |
599 _mirrors[T_BYTE] = _byte_mirror; | |
600 _mirrors[T_BOOLEAN] = _bool_mirror; | |
601 _mirrors[T_CHAR] = _char_mirror; | |
602 _mirrors[T_LONG] = _long_mirror; | |
603 _mirrors[T_SHORT] = _short_mirror; | |
604 _mirrors[T_VOID] = _void_mirror; | |
605 //_mirrors[T_OBJECT] = instanceKlass::cast(_object_klass)->java_mirror(); | |
606 //_mirrors[T_ARRAY] = instanceKlass::cast(_object_klass)->java_mirror(); | |
607 } | |
608 } | |
609 | |
610 void Universe::fixup_mirrors(TRAPS) { | |
611 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, | |
612 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply | |
613 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note | |
614 // that the number of objects allocated at this point is very small. | |
1142 | 615 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); |
0 | 616 FixupMirrorClosure blk; |
617 Universe::heap()->permanent_object_iterate(&blk); | |
618 } | |
619 | |
620 | |
621 static bool has_run_finalizers_on_exit = false; | |
622 | |
623 void Universe::run_finalizers_on_exit() { | |
624 if (has_run_finalizers_on_exit) return; | |
625 has_run_finalizers_on_exit = true; | |
626 | |
627 // Called on VM exit. This ought to be run in a separate thread. | |
628 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); | |
629 { | |
630 PRESERVE_EXCEPTION_MARK; | |
1142 | 631 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); |
0 | 632 JavaValue result(T_VOID); |
633 JavaCalls::call_static( | |
634 &result, | |
635 finalizer_klass, | |
636 vmSymbolHandles::run_finalizers_on_exit_name(), | |
637 vmSymbolHandles::void_method_signature(), | |
638 THREAD | |
639 ); | |
640 // Ignore any pending exceptions | |
641 CLEAR_PENDING_EXCEPTION; | |
642 } | |
643 } | |
644 | |
645 | |
646 // initialize_vtable could cause gc if | |
647 // 1) we specified true to initialize_vtable and | |
648 // 2) this ran after gc was enabled | |
649 // In case those ever change we use handles for oops | |
650 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { | |
651 // init vtable of k and all subclasses | |
652 Klass* ko = k_h()->klass_part(); | |
653 klassVtable* vt = ko->vtable(); | |
654 if (vt) vt->initialize_vtable(false, CHECK); | |
655 if (ko->oop_is_instance()) { | |
656 instanceKlass* ik = (instanceKlass*)ko; | |
657 for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->klass_part()->next_sibling())) { | |
658 reinitialize_vtable_of(s_h, CHECK); | |
659 } | |
660 } | |
661 } | |
662 | |
663 | |
664 void initialize_itable_for_klass(klassOop k, TRAPS) { | |
665 instanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); | |
666 } | |
667 | |
668 | |
669 void Universe::reinitialize_itables(TRAPS) { | |
670 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); | |
671 | |
672 } | |
673 | |
674 | |
675 bool Universe::on_page_boundary(void* addr) { | |
676 return ((uintptr_t) addr) % os::vm_page_size() == 0; | |
677 } | |
678 | |
679 | |
680 bool Universe::should_fill_in_stack_trace(Handle throwable) { | |
681 // never attempt to fill in the stack trace of preallocated errors that do not have | |
682 // backtrace. These errors are kept alive forever and may be "re-used" when all | |
683 // preallocated errors with backtrace have been consumed. Also need to avoid | |
684 // a potential loop which could happen if an out of memory occurs when attempting | |
685 // to allocate the backtrace. | |
686 return ((throwable() != Universe::_out_of_memory_error_java_heap) && | |
687 (throwable() != Universe::_out_of_memory_error_perm_gen) && | |
688 (throwable() != Universe::_out_of_memory_error_array_size) && | |
689 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); | |
690 } | |
691 | |
692 | |
693 oop Universe::gen_out_of_memory_error(oop default_err) { | |
694 // generate an out of memory error: | |
695 // - if there is a preallocated error with backtrace available then return it wth | |
696 // a filled in stack trace. | |
697 // - if there are no preallocated errors with backtrace available then return | |
698 // an error without backtrace. | |
699 int next; | |
700 if (_preallocated_out_of_memory_error_avail_count > 0) { | |
701 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); | |
702 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); | |
703 } else { | |
704 next = -1; | |
705 } | |
706 if (next < 0) { | |
707 // all preallocated errors have been used. | |
708 // return default | |
709 return default_err; | |
710 } else { | |
711 // get the error object at the slot and set set it to NULL so that the | |
712 // array isn't keeping it alive anymore. | |
713 oop exc = preallocated_out_of_memory_errors()->obj_at(next); | |
714 assert(exc != NULL, "slot has been used already"); | |
715 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); | |
716 | |
717 // use the message from the default error | |
718 oop msg = java_lang_Throwable::message(default_err); | |
719 assert(msg != NULL, "no message"); | |
720 java_lang_Throwable::set_message(exc, msg); | |
721 | |
722 // populate the stack trace and return it. | |
723 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); | |
724 return exc; | |
725 } | |
726 } | |
727 | |
728 static intptr_t non_oop_bits = 0; | |
729 | |
730 void* Universe::non_oop_word() { | |
731 // Neither the high bits nor the low bits of this value is allowed | |
732 // to look like (respectively) the high or low bits of a real oop. | |
733 // | |
734 // High and low are CPU-specific notions, but low always includes | |
735 // the low-order bit. Since oops are always aligned at least mod 4, | |
736 // setting the low-order bit will ensure that the low half of the | |
737 // word will never look like that of a real oop. | |
738 // | |
739 // Using the OS-supplied non-memory-address word (usually 0 or -1) | |
740 // will take care of the high bits, however many there are. | |
741 | |
742 if (non_oop_bits == 0) { | |
743 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; | |
744 } | |
745 | |
746 return (void*)non_oop_bits; | |
747 } | |
748 | |
749 jint universe_init() { | |
750 assert(!Universe::_fully_initialized, "called after initialize_vtables"); | |
751 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), | |
752 "LogHeapWordSize is incorrect."); | |
753 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); | |
754 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, | |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
755 "oop size is not not a multiple of HeapWord size"); |
0 | 756 TraceTime timer("Genesis", TraceStartupTime); |
757 GC_locker::lock(); // do not allow gc during bootstrapping | |
758 JavaClasses::compute_hard_coded_offsets(); | |
759 | |
760 // Get map info from shared archive file. | |
761 if (DumpSharedSpaces) | |
762 UseSharedSpaces = false; | |
763 | |
764 FileMapInfo* mapinfo = NULL; | |
765 if (UseSharedSpaces) { | |
766 mapinfo = NEW_C_HEAP_OBJ(FileMapInfo); | |
767 memset(mapinfo, 0, sizeof(FileMapInfo)); | |
768 | |
769 // Open the shared archive file, read and validate the header. If | |
770 // initialization files, shared spaces [UseSharedSpaces] are | |
771 // disabled and the file is closed. | |
772 | |
773 if (mapinfo->initialize()) { | |
774 FileMapInfo::set_current_info(mapinfo); | |
775 } else { | |
776 assert(!mapinfo->is_open() && !UseSharedSpaces, | |
777 "archive file not closed or shared spaces not disabled."); | |
778 } | |
779 } | |
780 | |
781 jint status = Universe::initialize_heap(); | |
782 if (status != JNI_OK) { | |
783 return status; | |
784 } | |
785 | |
786 // We have a heap so create the methodOop caches before | |
787 // CompactingPermGenGen::initialize_oops() tries to populate them. | |
788 Universe::_finalizer_register_cache = new LatestMethodOopCache(); | |
789 Universe::_loader_addClass_cache = new LatestMethodOopCache(); | |
790 Universe::_reflect_invoke_cache = new ActiveMethodOopsCache(); | |
791 | |
792 if (UseSharedSpaces) { | |
793 | |
794 // Read the data structures supporting the shared spaces (shared | |
795 // system dictionary, symbol table, etc.). After that, access to | |
796 // the file (other than the mapped regions) is no longer needed, and | |
797 // the file is closed. Closing the file does not affect the | |
798 // currently mapped regions. | |
799 | |
800 CompactingPermGenGen::initialize_oops(); | |
801 mapinfo->close(); | |
802 | |
803 } else { | |
804 SymbolTable::create_table(); | |
805 StringTable::create_table(); | |
806 ClassLoader::create_package_info_table(); | |
807 } | |
808 | |
809 return JNI_OK; | |
810 } | |
811 | |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
812 // Choose the heap base address and oop encoding mode |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
813 // when compressed oops are used: |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
814 // Unscaled - Use 32-bits oops without encoding when |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
815 // NarrowOopHeapBaseMin + heap_size < 4Gb |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
816 // ZeroBased - Use zero based compressed oops with encoding when |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
817 // NarrowOopHeapBaseMin + heap_size < 32Gb |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
818 // HeapBased - Use compressed oops with heap base + encoding. |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
819 |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
820 // 4Gb |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
821 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
822 // 32Gb |
1571
2d127394260e
6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb
kvn
parents:
1507
diff
changeset
|
823 // OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes; |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
824 |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
825 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) { |
1057
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
826 size_t base = 0; |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
827 #ifdef _LP64 |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
828 if (UseCompressedOops) { |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
829 assert(mode == UnscaledNarrowOop || |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
830 mode == ZeroBasedNarrowOop || |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
831 mode == HeapBasedNarrowOop, "mode is invalid"); |
1057
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
832 const size_t total_size = heap_size + HeapBaseMinAddress; |
922
1a81ea4b45d4
6869822: assert(Universe::narrow_oop_shift() == 0,"use unscaled narrow oop")
kvn
parents:
845
diff
changeset
|
833 // Return specified base for the first request. |
1a81ea4b45d4
6869822: assert(Universe::narrow_oop_shift() == 0,"use unscaled narrow oop")
kvn
parents:
845
diff
changeset
|
834 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { |
1057
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
835 base = HeapBaseMinAddress; |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
836 } else if (total_size <= OopEncodingHeapMax && (mode != HeapBasedNarrowOop)) { |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
837 if (total_size <= NarrowOopHeapMax && (mode == UnscaledNarrowOop) && |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
838 (Universe::narrow_oop_shift() == 0)) { |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
839 // Use 32-bits oops without encoding and |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
840 // place heap's top on the 4Gb boundary |
1057
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
841 base = (NarrowOopHeapMax - heap_size); |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
842 } else { |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
843 // Can't reserve with NarrowOopShift == 0 |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
844 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
845 if (mode == UnscaledNarrowOop || |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
846 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
847 // Use zero based compressed oops with encoding and |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
848 // place heap's top on the 32Gb boundary in case |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
849 // total_size > 4Gb or failed to reserve below 4Gb. |
1057
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
850 base = (OopEncodingHeapMax - heap_size); |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
851 } |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
852 } |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
853 } else { |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
854 // Can't reserve below 32Gb. |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
855 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
856 } |
1057
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
857 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
858 // used in ReservedHeapSpace() constructors. |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
859 // The final values will be set in initialize_heap() below. |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
860 if (base != 0 && (base + heap_size) <= OopEncodingHeapMax) { |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
861 // Use zero based compressed oops |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
862 Universe::set_narrow_oop_base(NULL); |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
863 // Don't need guard page for implicit checks in indexed |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
864 // addressing mode with zero based Compressed Oops. |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
865 Universe::set_narrow_oop_use_implicit_null_checks(true); |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
866 } else { |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
867 // Set to a non-NULL value so the ReservedSpace ctor computes |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
868 // the correct no-access prefix. |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
869 // The final value will be set in initialize_heap() below. |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
870 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
871 #ifdef _WIN64 |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
872 if (UseLargePages) { |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
873 // Cannot allocate guard pages for implicit checks in indexed |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
874 // addressing mode when large pages are specified on windows. |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
875 Universe::set_narrow_oop_use_implicit_null_checks(false); |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
876 } |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
877 #endif // _WIN64 |
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
878 } |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
879 } |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
880 #endif |
1057
f334aec453a1
6896084: VM does not reserve protected page below heap for compressed oops implicit null checks
kvn
parents:
922
diff
changeset
|
881 return (char*)base; // also return NULL (don't care) for 32-bit VM |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
882 } |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
883 |
0 | 884 jint Universe::initialize_heap() { |
885 | |
886 if (UseParallelGC) { | |
887 #ifndef SERIALGC | |
888 Universe::_collectedHeap = new ParallelScavengeHeap(); | |
889 #else // SERIALGC | |
890 fatal("UseParallelGC not supported in java kernel vm."); | |
891 #endif // SERIALGC | |
892 | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
893 } else if (UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
894 #ifndef SERIALGC |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
895 G1CollectorPolicy* g1p = new G1CollectorPolicy_BestRegionsFirst(); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
896 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
897 Universe::_collectedHeap = g1h; |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
898 #else // SERIALGC |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
899 fatal("UseG1GC not supported in java kernel vm."); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
900 #endif // SERIALGC |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
901 |
0 | 902 } else { |
903 GenCollectorPolicy *gc_policy; | |
904 | |
905 if (UseSerialGC) { | |
906 gc_policy = new MarkSweepPolicy(); | |
907 } else if (UseConcMarkSweepGC) { | |
908 #ifndef SERIALGC | |
909 if (UseAdaptiveSizePolicy) { | |
910 gc_policy = new ASConcurrentMarkSweepPolicy(); | |
911 } else { | |
912 gc_policy = new ConcurrentMarkSweepPolicy(); | |
913 } | |
914 #else // SERIALGC | |
915 fatal("UseConcMarkSweepGC not supported in java kernel vm."); | |
916 #endif // SERIALGC | |
917 } else { // default old generation | |
918 gc_policy = new MarkSweepPolicy(); | |
919 } | |
920 | |
921 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); | |
922 } | |
923 | |
924 jint status = Universe::heap()->initialize(); | |
925 if (status != JNI_OK) { | |
926 return status; | |
927 } | |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
928 |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
929 #ifdef _LP64 |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
930 if (UseCompressedOops) { |
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
931 // Subtract a page because something can get allocated at heap base. |
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
932 // This also makes implicit null checking work, because the |
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
933 // memory+1 page below heap_base needs to cause a signal. |
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
934 // See needs_explicit_null_check. |
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
935 // Only set the heap base for compressed oops because it indicates |
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
936 // compressed oops for pstack code. |
2080 | 937 bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose); |
938 if (verbose) { | |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
939 tty->cr(); |
1963 | 940 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", |
941 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); | |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
942 } |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
943 if ((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax) { |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
944 // Can't reserve heap below 32Gb. |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
945 Universe::set_narrow_oop_base(Universe::heap()->base() - os::vm_page_size()); |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
946 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
2080 | 947 if (verbose) { |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
948 tty->print(", Compressed Oops with base: "PTR_FORMAT, Universe::narrow_oop_base()); |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
949 } |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
950 } else { |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
951 Universe::set_narrow_oop_base(0); |
2080 | 952 if (verbose) { |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
953 tty->print(", zero based Compressed Oops"); |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
954 } |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
955 #ifdef _WIN64 |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
956 if (!Universe::narrow_oop_use_implicit_null_checks()) { |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
957 // Don't need guard page for implicit checks in indexed addressing |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
958 // mode with zero based Compressed Oops. |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
959 Universe::set_narrow_oop_use_implicit_null_checks(true); |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
960 } |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
961 #endif // _WIN64 |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
962 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
963 // Can't reserve heap below 4Gb. |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
964 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
965 } else { |
922
1a81ea4b45d4
6869822: assert(Universe::narrow_oop_shift() == 0,"use unscaled narrow oop")
kvn
parents:
845
diff
changeset
|
966 Universe::set_narrow_oop_shift(0); |
2080 | 967 if (verbose) { |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
968 tty->print(", 32-bits Oops"); |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
969 } |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
970 } |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
971 } |
2080 | 972 if (verbose) { |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
973 tty->cr(); |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
974 tty->cr(); |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
975 } |
113
ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
0
diff
changeset
|
976 } |
642
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
977 assert(Universe::narrow_oop_base() == (Universe::heap()->base() - os::vm_page_size()) || |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
978 Universe::narrow_oop_base() == NULL, "invalid value"); |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
979 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
980 Universe::narrow_oop_shift() == 0, "invalid value"); |
660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
kvn
parents:
494
diff
changeset
|
981 #endif |
0 | 982 |
983 // We will never reach the CATCH below since Exceptions::_throw will cause | |
984 // the VM to exit if an exception is thrown during initialization | |
985 | |
986 if (UseTLAB) { | |
987 assert(Universe::heap()->supports_tlab_allocation(), | |
988 "Should support thread-local allocation buffers"); | |
989 ThreadLocalAllocBuffer::startup_initialization(); | |
990 } | |
991 return JNI_OK; | |
992 } | |
993 | |
994 // It's the caller's repsonsibility to ensure glitch-freedom | |
995 // (if required). | |
996 void Universe::update_heap_info_at_gc() { | |
997 _heap_capacity_at_last_gc = heap()->capacity(); | |
998 _heap_used_at_last_gc = heap()->used(); | |
999 } | |
1000 | |
1001 | |
1002 | |
1003 void universe2_init() { | |
1004 EXCEPTION_MARK; | |
1005 Universe::genesis(CATCH); | |
1006 // Although we'd like to verify here that the state of the heap | |
1007 // is good, we can't because the main thread has not yet added | |
1008 // itself to the threads list (so, using current interfaces | |
1009 // we can't "fill" its TLAB), unless TLABs are disabled. | |
1010 if (VerifyBeforeGC && !UseTLAB && | |
1011 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
1012 Universe::heap()->prepare_for_verify(); | |
1013 Universe::verify(); // make sure we're starting with a clean slate | |
1014 } | |
1015 } | |
1016 | |
1017 | |
1018 // This function is defined in JVM.cpp | |
1019 extern void initialize_converter_functions(); | |
1020 | |
1021 bool universe_post_init() { | |
1959
9eecf81a02fb
7000578: CMS: assert(SafepointSynchronize::is_at_safepoint()) failed: Else races are possible
ysr
parents:
1579
diff
changeset
|
1022 assert(!is_init_completed(), "Error: initialization not yet completed!"); |
0 | 1023 Universe::_fully_initialized = true; |
1024 EXCEPTION_MARK; | |
1025 { ResourceMark rm; | |
1026 Interpreter::initialize(); // needed for interpreter entry points | |
1027 if (!UseSharedSpaces) { | |
1142 | 1028 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); |
0 | 1029 Universe::reinitialize_vtable_of(ok_h, CHECK_false); |
1030 Universe::reinitialize_itables(CHECK_false); | |
1031 } | |
1032 } | |
1033 | |
1034 klassOop k; | |
1035 instanceKlassHandle k_h; | |
1036 if (!UseSharedSpaces) { | |
1037 // Setup preallocated empty java.lang.Class array | |
1142 | 1038 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); |
0 | 1039 // Setup preallocated OutOfMemoryError errors |
1040 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_OutOfMemoryError(), true, CHECK_false); | |
1041 k_h = instanceKlassHandle(THREAD, k); | |
1042 Universe::_out_of_memory_error_java_heap = k_h->allocate_permanent_instance(CHECK_false); | |
1043 Universe::_out_of_memory_error_perm_gen = k_h->allocate_permanent_instance(CHECK_false); | |
1044 Universe::_out_of_memory_error_array_size = k_h->allocate_permanent_instance(CHECK_false); | |
1045 Universe::_out_of_memory_error_gc_overhead_limit = | |
1046 k_h->allocate_permanent_instance(CHECK_false); | |
1047 | |
1048 // Setup preallocated NullPointerException | |
1049 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
1050 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_NullPointerException(), true, CHECK_false); | |
1051 Universe::_null_ptr_exception_instance = instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); | |
1052 // Setup preallocated ArithmeticException | |
1053 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
1054 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_ArithmeticException(), true, CHECK_false); | |
1055 Universe::_arithmetic_exception_instance = instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); | |
1056 // Virtual Machine Error for when we get into a situation we can't resolve | |
1057 k = SystemDictionary::resolve_or_fail( | |
1058 vmSymbolHandles::java_lang_VirtualMachineError(), true, CHECK_false); | |
1059 bool linked = instanceKlass::cast(k)->link_class_or_fail(CHECK_false); | |
1060 if (!linked) { | |
1061 tty->print_cr("Unable to link/verify VirtualMachineError class"); | |
1062 return false; // initialization failed | |
1063 } | |
1064 Universe::_virtual_machine_error_instance = | |
1065 instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); | |
1066 } | |
1067 if (!DumpSharedSpaces) { | |
1068 // These are the only Java fields that are currently set during shared space dumping. | |
1069 // We prefer to not handle this generally, so we always reinitialize these detail messages. | |
1070 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); | |
1071 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); | |
1072 | |
1073 msg = java_lang_String::create_from_str("PermGen space", CHECK_false); | |
1074 java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg()); | |
1075 | |
1076 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); | |
1077 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); | |
1078 | |
1079 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); | |
1080 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); | |
1081 | |
1082 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); | |
1083 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); | |
1084 | |
1085 // Setup the array of errors that have preallocated backtrace | |
1086 k = Universe::_out_of_memory_error_java_heap->klass(); | |
1087 assert(k->klass_part()->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); | |
1088 k_h = instanceKlassHandle(THREAD, k); | |
1089 | |
1090 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; | |
1091 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); | |
1092 for (int i=0; i<len; i++) { | |
1093 oop err = k_h->allocate_permanent_instance(CHECK_false); | |
1094 Handle err_h = Handle(THREAD, err); | |
1095 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); | |
1096 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); | |
1097 } | |
1098 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; | |
1099 } | |
1100 | |
1101 | |
1102 // Setup static method for registering finalizers | |
1103 // The finalizer klass must be linked before looking up the method, in | |
1104 // case it needs to get rewritten. | |
1142 | 1105 instanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); |
1106 methodOop m = instanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( | |
0 | 1107 vmSymbols::register_method_name(), |
1108 vmSymbols::register_method_signature()); | |
1109 if (m == NULL || !m->is_static()) { | |
1110 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
1111 "java.lang.ref.Finalizer.register", false); | |
1112 } | |
1113 Universe::_finalizer_register_cache->init( | |
1142 | 1114 SystemDictionary::Finalizer_klass(), m, CHECK_false); |
0 | 1115 |
1116 // Resolve on first use and initialize class. | |
1117 // Note: No race-condition here, since a resolve will always return the same result | |
1118 | |
1119 // Setup method for security checks | |
1120 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_reflect_Method(), true, CHECK_false); | |
1121 k_h = instanceKlassHandle(THREAD, k); | |
1122 k_h->link_class(CHECK_false); | |
1507
cd5dbf694d45
6939134: JSR 292 adjustments to method handle invocation
jrose
parents:
1142
diff
changeset
|
1123 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_object_array_object_signature()); |
0 | 1124 if (m == NULL || m->is_static()) { |
1125 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
1126 "java.lang.reflect.Method.invoke", false); | |
1127 } | |
1128 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false); | |
1129 | |
1130 // Setup method for registering loaded classes in class loader vector | |
1142 | 1131 instanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); |
1132 m = instanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); | |
0 | 1133 if (m == NULL || m->is_static()) { |
1134 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
1135 "java.lang.ClassLoader.addClass", false); | |
1136 } | |
1137 Universe::_loader_addClass_cache->init( | |
1142 | 1138 SystemDictionary::ClassLoader_klass(), m, CHECK_false); |
0 | 1139 |
1140 // The folowing is initializing converter functions for serialization in | |
1141 // JVM.cpp. If we clean up the StrictMath code above we may want to find | |
1142 // a better solution for this as well. | |
1143 initialize_converter_functions(); | |
1144 | |
1145 // This needs to be done before the first scavenge/gc, since | |
1146 // it's an input to soft ref clearing policy. | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
1147 { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
1148 MutexLocker x(Heap_lock); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
1149 Universe::update_heap_info_at_gc(); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
1150 } |
0 | 1151 |
1152 // ("weak") refs processing infrastructure initialization | |
1153 Universe::heap()->post_initialize(); | |
1154 | |
1155 GC_locker::unlock(); // allow gc after bootstrapping | |
1156 | |
1157 MemoryService::set_universe_heap(Universe::_collectedHeap); | |
1158 return true; | |
1159 } | |
1160 | |
1161 | |
1162 void Universe::compute_base_vtable_size() { | |
1163 _base_vtable_size = ClassLoader::compute_Object_vtable(); | |
1164 } | |
1165 | |
1166 | |
1167 // %%% The Universe::flush_foo methods belong in CodeCache. | |
1168 | |
1169 // Flushes compiled methods dependent on dependee. | |
1170 void Universe::flush_dependents_on(instanceKlassHandle dependee) { | |
1171 assert_lock_strong(Compile_lock); | |
1172 | |
1173 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
1174 | |
1175 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1176 // stopped dring the safepoint so CodeCache will be safe to update without | |
1177 // holding the CodeCache_lock. | |
1178 | |
1179 DepChange changes(dependee); | |
1180 | |
1181 // Compute the dependent nmethods | |
1182 if (CodeCache::mark_for_deoptimization(changes) > 0) { | |
1183 // At least one nmethod has been marked for deoptimization | |
1184 VM_Deoptimize op; | |
1185 VMThread::execute(&op); | |
1186 } | |
1187 } | |
1188 | |
1189 #ifdef HOTSWAP | |
1190 // Flushes compiled methods dependent on dependee in the evolutionary sense | |
1191 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { | |
1192 // --- Compile_lock is not held. However we are at a safepoint. | |
1193 assert_locked_or_safepoint(Compile_lock); | |
1194 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
1195 | |
1196 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1197 // stopped dring the safepoint so CodeCache will be safe to update without | |
1198 // holding the CodeCache_lock. | |
1199 | |
1200 // Compute the dependent nmethods | |
1201 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { | |
1202 // At least one nmethod has been marked for deoptimization | |
1203 | |
1204 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
1205 // Stuff copied from VM_Deoptimize and modified slightly. | |
1206 | |
1207 // We do not want any GCs to happen while we are in the middle of this VM operation | |
1208 ResourceMark rm; | |
1209 DeoptimizationMarker dm; | |
1210 | |
1211 // Deoptimize all activations depending on marked nmethods | |
1212 Deoptimization::deoptimize_dependents(); | |
1213 | |
1214 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
1215 CodeCache::make_marked_nmethods_not_entrant(); | |
1216 } | |
1217 } | |
1218 #endif // HOTSWAP | |
1219 | |
1220 | |
1221 // Flushes compiled methods dependent on dependee | |
1222 void Universe::flush_dependents_on_method(methodHandle m_h) { | |
1223 // --- Compile_lock is not held. However we are at a safepoint. | |
1224 assert_locked_or_safepoint(Compile_lock); | |
1225 | |
1226 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1227 // stopped dring the safepoint so CodeCache will be safe to update without | |
1228 // holding the CodeCache_lock. | |
1229 | |
1230 // Compute the dependent nmethods | |
1231 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { | |
1232 // At least one nmethod has been marked for deoptimization | |
1233 | |
1234 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
1235 // Stuff copied from VM_Deoptimize and modified slightly. | |
1236 | |
1237 // We do not want any GCs to happen while we are in the middle of this VM operation | |
1238 ResourceMark rm; | |
1239 DeoptimizationMarker dm; | |
1240 | |
1241 // Deoptimize all activations depending on marked nmethods | |
1242 Deoptimization::deoptimize_dependents(); | |
1243 | |
1244 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
1245 CodeCache::make_marked_nmethods_not_entrant(); | |
1246 } | |
1247 } | |
1248 | |
1249 void Universe::print() { print_on(gclog_or_tty); } | |
1250 | |
1251 void Universe::print_on(outputStream* st) { | |
1252 st->print_cr("Heap"); | |
1253 heap()->print_on(st); | |
1254 } | |
1255 | |
1256 void Universe::print_heap_at_SIGBREAK() { | |
1257 if (PrintHeapAtSIGBREAK) { | |
1258 MutexLocker hl(Heap_lock); | |
1259 print_on(tty); | |
1260 tty->cr(); | |
1261 tty->flush(); | |
1262 } | |
1263 } | |
1264 | |
1265 void Universe::print_heap_before_gc(outputStream* st) { | |
1266 st->print_cr("{Heap before GC invocations=%u (full %u):", | |
1267 heap()->total_collections(), | |
1268 heap()->total_full_collections()); | |
1269 heap()->print_on(st); | |
1270 } | |
1271 | |
1272 void Universe::print_heap_after_gc(outputStream* st) { | |
1273 st->print_cr("Heap after GC invocations=%u (full %u):", | |
1274 heap()->total_collections(), | |
1275 heap()->total_full_collections()); | |
1276 heap()->print_on(st); | |
1277 st->print_cr("}"); | |
1278 } | |
1279 | |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
647
diff
changeset
|
1280 void Universe::verify(bool allow_dirty, bool silent, bool option) { |
0 | 1281 if (SharedSkipVerify) { |
1282 return; | |
1283 } | |
1284 | |
1285 // The use of _verify_in_progress is a temporary work around for | |
1286 // 6320749. Don't bother with a creating a class to set and clear | |
1287 // it since it is only used in this method and the control flow is | |
1288 // straight forward. | |
1289 _verify_in_progress = true; | |
1290 | |
1291 COMPILER2_PRESENT( | |
1292 assert(!DerivedPointerTable::is_active(), | |
1293 "DPT should not be active during verification " | |
1294 "(of thread stacks below)"); | |
1295 ) | |
1296 | |
1297 ResourceMark rm; | |
1298 HandleMark hm; // Handles created during verification can be zapped | |
1299 _verify_count++; | |
1300 | |
1301 if (!silent) gclog_or_tty->print("[Verifying "); | |
1302 if (!silent) gclog_or_tty->print("threads "); | |
1303 Threads::verify(); | |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
647
diff
changeset
|
1304 heap()->verify(allow_dirty, silent, option); |
0 | 1305 |
1306 if (!silent) gclog_or_tty->print("syms "); | |
1307 SymbolTable::verify(); | |
1308 if (!silent) gclog_or_tty->print("strs "); | |
1309 StringTable::verify(); | |
1310 { | |
1311 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
1312 if (!silent) gclog_or_tty->print("zone "); | |
1313 CodeCache::verify(); | |
1314 } | |
1315 if (!silent) gclog_or_tty->print("dict "); | |
1316 SystemDictionary::verify(); | |
1317 if (!silent) gclog_or_tty->print("hand "); | |
1318 JNIHandles::verify(); | |
1319 if (!silent) gclog_or_tty->print("C-heap "); | |
1320 os::check_heap(); | |
1321 if (!silent) gclog_or_tty->print_cr("]"); | |
1322 | |
1323 _verify_in_progress = false; | |
1324 } | |
1325 | |
1326 // Oop verification (see MacroAssembler::verify_oop) | |
1327 | |
1328 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; | |
1329 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; | |
1330 | |
1331 | |
1332 static void calculate_verify_data(uintptr_t verify_data[2], | |
1333 HeapWord* low_boundary, | |
1334 HeapWord* high_boundary) { | |
1335 assert(low_boundary < high_boundary, "bad interval"); | |
1336 | |
1337 // decide which low-order bits we require to be clear: | |
1338 size_t alignSize = MinObjAlignmentInBytes; | |
1571
2d127394260e
6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb
kvn
parents:
1507
diff
changeset
|
1339 size_t min_object_size = CollectedHeap::min_fill_size(); |
0 | 1340 |
1341 // make an inclusive limit: | |
1342 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; | |
1343 uintptr_t min = (uintptr_t)low_boundary; | |
1344 assert(min < max, "bad interval"); | |
1345 uintptr_t diff = max ^ min; | |
1346 | |
1347 // throw away enough low-order bits to make the diff vanish | |
1348 uintptr_t mask = (uintptr_t)(-1); | |
1349 while ((mask & diff) != 0) | |
1350 mask <<= 1; | |
1351 uintptr_t bits = (min & mask); | |
1352 assert(bits == (max & mask), "correct mask"); | |
1353 // check an intermediate value between min and max, just to make sure: | |
1354 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); | |
1355 | |
1356 // require address alignment, too: | |
1357 mask |= (alignSize - 1); | |
1358 | |
1359 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { | |
1360 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); | |
1361 } | |
1362 verify_data[0] = mask; | |
1363 verify_data[1] = bits; | |
1364 } | |
1365 | |
1366 | |
1367 // Oop verification (see MacroAssembler::verify_oop) | |
1368 #ifndef PRODUCT | |
1369 | |
1370 uintptr_t Universe::verify_oop_mask() { | |
1371 MemRegion m = heap()->reserved_region(); | |
1372 calculate_verify_data(_verify_oop_data, | |
1373 m.start(), | |
1374 m.end()); | |
1375 return _verify_oop_data[0]; | |
1376 } | |
1377 | |
1378 | |
1379 | |
1380 uintptr_t Universe::verify_oop_bits() { | |
1381 verify_oop_mask(); | |
1382 return _verify_oop_data[1]; | |
1383 } | |
1384 | |
1385 | |
1386 uintptr_t Universe::verify_klass_mask() { | |
1387 /* $$$ | |
1388 // A klass can never live in the new space. Since the new and old | |
1389 // spaces can change size, we must settle for bounds-checking against | |
1390 // the bottom of the world, plus the smallest possible new and old | |
1391 // space sizes that may arise during execution. | |
1392 size_t min_new_size = Universe::new_size(); // in bytes | |
1393 size_t min_old_size = Universe::old_size(); // in bytes | |
1394 calculate_verify_data(_verify_klass_data, | |
1395 (HeapWord*)((uintptr_t)_new_gen->low_boundary + min_new_size + min_old_size), | |
1396 _perm_gen->high_boundary); | |
1397 */ | |
1398 // Why doesn't the above just say that klass's always live in the perm | |
1399 // gen? I'll see if that seems to work... | |
1400 MemRegion permanent_reserved; | |
1401 switch (Universe::heap()->kind()) { | |
1402 default: | |
1403 // ???: What if a CollectedHeap doesn't have a permanent generation? | |
1404 ShouldNotReachHere(); | |
1405 break; | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
1406 case CollectedHeap::GenCollectedHeap: |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
1407 case CollectedHeap::G1CollectedHeap: { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
1408 SharedHeap* sh = (SharedHeap*) Universe::heap(); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
1409 permanent_reserved = sh->perm_gen()->reserved(); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
1410 break; |
0 | 1411 } |
1412 #ifndef SERIALGC | |
1413 case CollectedHeap::ParallelScavengeHeap: { | |
1414 ParallelScavengeHeap* psh = (ParallelScavengeHeap*) Universe::heap(); | |
1415 permanent_reserved = psh->perm_gen()->reserved(); | |
1416 break; | |
1417 } | |
1418 #endif // SERIALGC | |
1419 } | |
1420 calculate_verify_data(_verify_klass_data, | |
1421 permanent_reserved.start(), | |
1422 permanent_reserved.end()); | |
1423 | |
1424 return _verify_klass_data[0]; | |
1425 } | |
1426 | |
1427 | |
1428 | |
1429 uintptr_t Universe::verify_klass_bits() { | |
1430 verify_klass_mask(); | |
1431 return _verify_klass_data[1]; | |
1432 } | |
1433 | |
1434 | |
1435 uintptr_t Universe::verify_mark_mask() { | |
1436 return markOopDesc::lock_mask_in_place; | |
1437 } | |
1438 | |
1439 | |
1440 | |
1441 uintptr_t Universe::verify_mark_bits() { | |
1442 intptr_t mask = verify_mark_mask(); | |
1443 intptr_t bits = (intptr_t)markOopDesc::prototype(); | |
1444 assert((bits & ~mask) == 0, "no stray header bits"); | |
1445 return bits; | |
1446 } | |
1447 #endif // PRODUCT | |
1448 | |
1449 | |
1450 void Universe::compute_verify_oop_data() { | |
1451 verify_oop_mask(); | |
1452 verify_oop_bits(); | |
1453 verify_mark_mask(); | |
1454 verify_mark_bits(); | |
1455 verify_klass_mask(); | |
1456 verify_klass_bits(); | |
1457 } | |
1458 | |
1459 | |
1460 void CommonMethodOopCache::init(klassOop k, methodOop m, TRAPS) { | |
1461 if (!UseSharedSpaces) { | |
1462 _klass = k; | |
1463 } | |
1464 #ifndef PRODUCT | |
1465 else { | |
1466 // sharing initilization should have already set up _klass | |
1467 assert(_klass != NULL, "just checking"); | |
1468 } | |
1469 #endif | |
1470 | |
1471 _method_idnum = m->method_idnum(); | |
1472 assert(_method_idnum >= 0, "sanity check"); | |
1473 } | |
1474 | |
1475 | |
1476 ActiveMethodOopsCache::~ActiveMethodOopsCache() { | |
1477 if (_prev_methods != NULL) { | |
1478 for (int i = _prev_methods->length() - 1; i >= 0; i--) { | |
1479 jweak method_ref = _prev_methods->at(i); | |
1480 if (method_ref != NULL) { | |
1481 JNIHandles::destroy_weak_global(method_ref); | |
1482 } | |
1483 } | |
1484 delete _prev_methods; | |
1485 _prev_methods = NULL; | |
1486 } | |
1487 } | |
1488 | |
1489 | |
1490 void ActiveMethodOopsCache::add_previous_version(const methodOop method) { | |
1491 assert(Thread::current()->is_VM_thread(), | |
1492 "only VMThread can add previous versions"); | |
1493 | |
1494 if (_prev_methods == NULL) { | |
1495 // This is the first previous version so make some space. | |
1496 // Start with 2 elements under the assumption that the class | |
1497 // won't be redefined much. | |
1498 _prev_methods = new (ResourceObj::C_HEAP) GrowableArray<jweak>(2, true); | |
1499 } | |
1500 | |
1501 // RC_TRACE macro has an embedded ResourceMark | |
1502 RC_TRACE(0x00000100, | |
1503 ("add: %s(%s): adding prev version ref for cached method @%d", | |
1504 method->name()->as_C_string(), method->signature()->as_C_string(), | |
1505 _prev_methods->length())); | |
1506 | |
1507 methodHandle method_h(method); | |
1508 jweak method_ref = JNIHandles::make_weak_global(method_h); | |
1509 _prev_methods->append(method_ref); | |
1510 | |
1511 // Using weak references allows previous versions of the cached | |
1512 // method to be GC'ed when they are no longer needed. Since the | |
1513 // caller is the VMThread and we are at a safepoint, this is a good | |
1514 // time to clear out unused weak references. | |
1515 | |
1516 for (int i = _prev_methods->length() - 1; i >= 0; i--) { | |
1517 jweak method_ref = _prev_methods->at(i); | |
1518 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); | |
1519 if (method_ref == NULL) { | |
1520 _prev_methods->remove_at(i); | |
1521 // Since we are traversing the array backwards, we don't have to | |
1522 // do anything special with the index. | |
1523 continue; // robustness | |
1524 } | |
1525 | |
1526 methodOop m = (methodOop)JNIHandles::resolve(method_ref); | |
1527 if (m == NULL) { | |
1528 // this method entry has been GC'ed so remove it | |
1529 JNIHandles::destroy_weak_global(method_ref); | |
1530 _prev_methods->remove_at(i); | |
1531 } else { | |
1532 // RC_TRACE macro has an embedded ResourceMark | |
1533 RC_TRACE(0x00000400, ("add: %s(%s): previous cached method @%d is alive", | |
1534 m->name()->as_C_string(), m->signature()->as_C_string(), i)); | |
1535 } | |
1536 } | |
1537 } // end add_previous_version() | |
1538 | |
1539 | |
1540 bool ActiveMethodOopsCache::is_same_method(const methodOop method) const { | |
1541 instanceKlass* ik = instanceKlass::cast(klass()); | |
1542 methodOop check_method = ik->method_with_idnum(method_idnum()); | |
1543 assert(check_method != NULL, "sanity check"); | |
1544 if (check_method == method) { | |
1545 // done with the easy case | |
1546 return true; | |
1547 } | |
1548 | |
1549 if (_prev_methods != NULL) { | |
1550 // The cached method has been redefined at least once so search | |
1551 // the previous versions for a match. | |
1552 for (int i = 0; i < _prev_methods->length(); i++) { | |
1553 jweak method_ref = _prev_methods->at(i); | |
1554 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); | |
1555 if (method_ref == NULL) { | |
1556 continue; // robustness | |
1557 } | |
1558 | |
1559 check_method = (methodOop)JNIHandles::resolve(method_ref); | |
1560 if (check_method == method) { | |
1561 // a previous version matches | |
1562 return true; | |
1563 } | |
1564 } | |
1565 } | |
1566 | |
1567 // either no previous versions or no previous version matched | |
1568 return false; | |
1569 } | |
1570 | |
1571 | |
1572 methodOop LatestMethodOopCache::get_methodOop() { | |
1573 instanceKlass* ik = instanceKlass::cast(klass()); | |
1574 methodOop m = ik->method_with_idnum(method_idnum()); | |
1575 assert(m != NULL, "sanity check"); | |
1576 return m; | |
1577 } | |
1578 | |
1579 | |
1580 #ifdef ASSERT | |
1581 // Release dummy object(s) at bottom of heap | |
1582 bool Universe::release_fullgc_alot_dummy() { | |
1583 MutexLocker ml(FullGCALot_lock); | |
1584 if (_fullgc_alot_dummy_array != NULL) { | |
1585 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { | |
1586 // No more dummies to release, release entire array instead | |
1587 _fullgc_alot_dummy_array = NULL; | |
1588 return false; | |
1589 } | |
1590 if (!UseConcMarkSweepGC) { | |
1591 // Release dummy at bottom of old generation | |
1592 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
1593 } | |
1594 // Release dummy at bottom of permanent generation | |
1595 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
1596 } | |
1597 return true; | |
1598 } | |
1599 | |
1600 #endif // ASSERT |