Mercurial > hg > truffle
annotate src/share/vm/memory/universe.cpp @ 1963:0ac62b4d6507
6999491: non-zero COOPs are used when they should not
Summary: HeapBaseMinAddress should be used only for a default heap size calculation.
Reviewed-by: iveresov, jcoomes, dholmes
author | kvn |
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date | Fri, 12 Nov 2010 09:51:43 -0800 |
parents | e9ff18c4ace7 |
children | 4110c3e0c50d |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2009, 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 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_universe.cpp.incl" | |
27 | |
28 // Known objects | |
29 klassOop Universe::_boolArrayKlassObj = NULL; | |
30 klassOop Universe::_byteArrayKlassObj = NULL; | |
31 klassOop Universe::_charArrayKlassObj = NULL; | |
32 klassOop Universe::_intArrayKlassObj = NULL; | |
33 klassOop Universe::_shortArrayKlassObj = NULL; | |
34 klassOop Universe::_longArrayKlassObj = NULL; | |
35 klassOop Universe::_singleArrayKlassObj = NULL; | |
36 klassOop Universe::_doubleArrayKlassObj = NULL; | |
37 klassOop Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; | |
38 klassOop Universe::_objectArrayKlassObj = NULL; | |
39 klassOop Universe::_symbolKlassObj = NULL; | |
40 klassOop Universe::_methodKlassObj = NULL; | |
41 klassOop Universe::_constMethodKlassObj = NULL; | |
42 klassOop Universe::_methodDataKlassObj = NULL; | |
43 klassOop Universe::_klassKlassObj = NULL; | |
44 klassOop Universe::_arrayKlassKlassObj = NULL; | |
45 klassOop Universe::_objArrayKlassKlassObj = NULL; | |
46 klassOop Universe::_typeArrayKlassKlassObj = NULL; | |
47 klassOop Universe::_instanceKlassKlassObj = NULL; | |
48 klassOop Universe::_constantPoolKlassObj = NULL; | |
49 klassOop Universe::_constantPoolCacheKlassObj = NULL; | |
50 klassOop Universe::_compiledICHolderKlassObj = NULL; | |
51 klassOop Universe::_systemObjArrayKlassObj = NULL; | |
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52 oop Universe::_int_mirror = NULL; |
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53 oop Universe::_float_mirror = NULL; |
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54 oop Universe::_double_mirror = NULL; |
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55 oop Universe::_byte_mirror = NULL; |
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56 oop Universe::_bool_mirror = NULL; |
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57 oop Universe::_char_mirror = NULL; |
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58 oop Universe::_long_mirror = NULL; |
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59 oop Universe::_short_mirror = NULL; |
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60 oop Universe::_void_mirror = NULL; |
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61 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; |
0 | 62 oop Universe::_main_thread_group = NULL; |
63 oop Universe::_system_thread_group = NULL; | |
64 typeArrayOop Universe::_the_empty_byte_array = NULL; | |
65 typeArrayOop Universe::_the_empty_short_array = NULL; | |
66 typeArrayOop Universe::_the_empty_int_array = NULL; | |
67 objArrayOop Universe::_the_empty_system_obj_array = NULL; | |
68 objArrayOop Universe::_the_empty_class_klass_array = NULL; | |
69 objArrayOop Universe::_the_array_interfaces_array = NULL; | |
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70 oop Universe::_the_null_string = NULL; |
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71 oop Universe::_the_min_jint_string = NULL; |
0 | 72 LatestMethodOopCache* Universe::_finalizer_register_cache = NULL; |
73 LatestMethodOopCache* Universe::_loader_addClass_cache = NULL; | |
74 ActiveMethodOopsCache* Universe::_reflect_invoke_cache = NULL; | |
75 oop Universe::_out_of_memory_error_java_heap = NULL; | |
76 oop Universe::_out_of_memory_error_perm_gen = NULL; | |
77 oop Universe::_out_of_memory_error_array_size = NULL; | |
78 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; | |
79 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; | |
80 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; | |
81 bool Universe::_verify_in_progress = false; | |
82 oop Universe::_null_ptr_exception_instance = NULL; | |
83 oop Universe::_arithmetic_exception_instance = NULL; | |
84 oop Universe::_virtual_machine_error_instance = NULL; | |
85 oop Universe::_vm_exception = NULL; | |
86 oop Universe::_emptySymbol = NULL; | |
87 | |
88 // These variables are guarded by FullGCALot_lock. | |
89 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) | |
90 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) | |
91 | |
92 | |
93 // Heap | |
94 int Universe::_verify_count = 0; | |
95 | |
96 int Universe::_base_vtable_size = 0; | |
97 bool Universe::_bootstrapping = false; | |
98 bool Universe::_fully_initialized = false; | |
99 | |
100 size_t Universe::_heap_capacity_at_last_gc; | |
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101 size_t Universe::_heap_used_at_last_gc = 0; |
0 | 102 |
103 CollectedHeap* Universe::_collectedHeap = NULL; | |
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104 |
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105 NarrowOopStruct Universe::_narrow_oop = { NULL, 0, true }; |
0 | 106 |
107 | |
108 void Universe::basic_type_classes_do(void f(klassOop)) { | |
109 f(boolArrayKlassObj()); | |
110 f(byteArrayKlassObj()); | |
111 f(charArrayKlassObj()); | |
112 f(intArrayKlassObj()); | |
113 f(shortArrayKlassObj()); | |
114 f(longArrayKlassObj()); | |
115 f(singleArrayKlassObj()); | |
116 f(doubleArrayKlassObj()); | |
117 } | |
118 | |
119 | |
120 void Universe::system_classes_do(void f(klassOop)) { | |
121 f(symbolKlassObj()); | |
122 f(methodKlassObj()); | |
123 f(constMethodKlassObj()); | |
124 f(methodDataKlassObj()); | |
125 f(klassKlassObj()); | |
126 f(arrayKlassKlassObj()); | |
127 f(objArrayKlassKlassObj()); | |
128 f(typeArrayKlassKlassObj()); | |
129 f(instanceKlassKlassObj()); | |
130 f(constantPoolKlassObj()); | |
131 f(systemObjArrayKlassObj()); | |
132 } | |
133 | |
134 void Universe::oops_do(OopClosure* f, bool do_all) { | |
135 | |
136 f->do_oop((oop*) &_int_mirror); | |
137 f->do_oop((oop*) &_float_mirror); | |
138 f->do_oop((oop*) &_double_mirror); | |
139 f->do_oop((oop*) &_byte_mirror); | |
140 f->do_oop((oop*) &_bool_mirror); | |
141 f->do_oop((oop*) &_char_mirror); | |
142 f->do_oop((oop*) &_long_mirror); | |
143 f->do_oop((oop*) &_short_mirror); | |
144 f->do_oop((oop*) &_void_mirror); | |
145 | |
146 // It's important to iterate over these guys even if they are null, | |
147 // since that's how shared heaps are restored. | |
148 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
149 f->do_oop((oop*) &_mirrors[i]); | |
150 } | |
151 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); | |
152 | |
153 // %%% Consider moving those "shared oops" over here with the others. | |
154 f->do_oop((oop*)&_boolArrayKlassObj); | |
155 f->do_oop((oop*)&_byteArrayKlassObj); | |
156 f->do_oop((oop*)&_charArrayKlassObj); | |
157 f->do_oop((oop*)&_intArrayKlassObj); | |
158 f->do_oop((oop*)&_shortArrayKlassObj); | |
159 f->do_oop((oop*)&_longArrayKlassObj); | |
160 f->do_oop((oop*)&_singleArrayKlassObj); | |
161 f->do_oop((oop*)&_doubleArrayKlassObj); | |
162 f->do_oop((oop*)&_objectArrayKlassObj); | |
163 { | |
164 for (int i = 0; i < T_VOID+1; i++) { | |
165 if (_typeArrayKlassObjs[i] != NULL) { | |
166 assert(i >= T_BOOLEAN, "checking"); | |
167 f->do_oop((oop*)&_typeArrayKlassObjs[i]); | |
168 } else if (do_all) { | |
169 f->do_oop((oop*)&_typeArrayKlassObjs[i]); | |
170 } | |
171 } | |
172 } | |
173 f->do_oop((oop*)&_symbolKlassObj); | |
174 f->do_oop((oop*)&_methodKlassObj); | |
175 f->do_oop((oop*)&_constMethodKlassObj); | |
176 f->do_oop((oop*)&_methodDataKlassObj); | |
177 f->do_oop((oop*)&_klassKlassObj); | |
178 f->do_oop((oop*)&_arrayKlassKlassObj); | |
179 f->do_oop((oop*)&_objArrayKlassKlassObj); | |
180 f->do_oop((oop*)&_typeArrayKlassKlassObj); | |
181 f->do_oop((oop*)&_instanceKlassKlassObj); | |
182 f->do_oop((oop*)&_constantPoolKlassObj); | |
183 f->do_oop((oop*)&_constantPoolCacheKlassObj); | |
184 f->do_oop((oop*)&_compiledICHolderKlassObj); | |
185 f->do_oop((oop*)&_systemObjArrayKlassObj); | |
186 f->do_oop((oop*)&_the_empty_byte_array); | |
187 f->do_oop((oop*)&_the_empty_short_array); | |
188 f->do_oop((oop*)&_the_empty_int_array); | |
189 f->do_oop((oop*)&_the_empty_system_obj_array); | |
190 f->do_oop((oop*)&_the_empty_class_klass_array); | |
191 f->do_oop((oop*)&_the_array_interfaces_array); | |
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192 f->do_oop((oop*)&_the_null_string); |
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193 f->do_oop((oop*)&_the_min_jint_string); |
0 | 194 _finalizer_register_cache->oops_do(f); |
195 _loader_addClass_cache->oops_do(f); | |
196 _reflect_invoke_cache->oops_do(f); | |
197 f->do_oop((oop*)&_out_of_memory_error_java_heap); | |
198 f->do_oop((oop*)&_out_of_memory_error_perm_gen); | |
199 f->do_oop((oop*)&_out_of_memory_error_array_size); | |
200 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); | |
201 if (_preallocated_out_of_memory_error_array != (oop)NULL) { // NULL when DumpSharedSpaces | |
202 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); | |
203 } | |
204 f->do_oop((oop*)&_null_ptr_exception_instance); | |
205 f->do_oop((oop*)&_arithmetic_exception_instance); | |
206 f->do_oop((oop*)&_virtual_machine_error_instance); | |
207 f->do_oop((oop*)&_main_thread_group); | |
208 f->do_oop((oop*)&_system_thread_group); | |
209 f->do_oop((oop*)&_vm_exception); | |
210 f->do_oop((oop*)&_emptySymbol); | |
211 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) | |
212 } | |
213 | |
214 | |
215 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { | |
216 if (size < alignment || size % alignment != 0) { | |
217 ResourceMark rm; | |
218 stringStream st; | |
219 st.print("Size of %s (%ld bytes) must be aligned to %ld bytes", name, size, alignment); | |
220 char* error = st.as_string(); | |
221 vm_exit_during_initialization(error); | |
222 } | |
223 } | |
224 | |
225 | |
226 void Universe::genesis(TRAPS) { | |
227 ResourceMark rm; | |
228 { FlagSetting fs(_bootstrapping, true); | |
229 | |
230 { MutexLocker mc(Compile_lock); | |
231 | |
232 // determine base vtable size; without that we cannot create the array klasses | |
233 compute_base_vtable_size(); | |
234 | |
235 if (!UseSharedSpaces) { | |
236 _klassKlassObj = klassKlass::create_klass(CHECK); | |
237 _arrayKlassKlassObj = arrayKlassKlass::create_klass(CHECK); | |
238 | |
239 _objArrayKlassKlassObj = objArrayKlassKlass::create_klass(CHECK); | |
240 _instanceKlassKlassObj = instanceKlassKlass::create_klass(CHECK); | |
241 _typeArrayKlassKlassObj = typeArrayKlassKlass::create_klass(CHECK); | |
242 | |
243 _symbolKlassObj = symbolKlass::create_klass(CHECK); | |
244 | |
245 _emptySymbol = oopFactory::new_symbol("", CHECK); | |
246 | |
247 _boolArrayKlassObj = typeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); | |
248 _charArrayKlassObj = typeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); | |
249 _singleArrayKlassObj = typeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); | |
250 _doubleArrayKlassObj = typeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); | |
251 _byteArrayKlassObj = typeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); | |
252 _shortArrayKlassObj = typeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); | |
253 _intArrayKlassObj = typeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); | |
254 _longArrayKlassObj = typeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); | |
255 | |
256 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; | |
257 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; | |
258 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; | |
259 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; | |
260 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; | |
261 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; | |
262 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; | |
263 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; | |
264 | |
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265 _methodKlassObj = methodKlass::create_klass(CHECK); |
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266 _constMethodKlassObj = constMethodKlass::create_klass(CHECK); |
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267 _methodDataKlassObj = methodDataKlass::create_klass(CHECK); |
0 | 268 _constantPoolKlassObj = constantPoolKlass::create_klass(CHECK); |
269 _constantPoolCacheKlassObj = constantPoolCacheKlass::create_klass(CHECK); | |
270 | |
271 _compiledICHolderKlassObj = compiledICHolderKlass::create_klass(CHECK); | |
272 _systemObjArrayKlassObj = objArrayKlassKlass::cast(objArrayKlassKlassObj())->allocate_system_objArray_klass(CHECK); | |
273 | |
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274 _the_empty_byte_array = oopFactory::new_permanent_byteArray(0, CHECK); |
0 | 275 _the_empty_short_array = oopFactory::new_permanent_shortArray(0, CHECK); |
276 _the_empty_int_array = oopFactory::new_permanent_intArray(0, CHECK); | |
277 _the_empty_system_obj_array = oopFactory::new_system_objArray(0, CHECK); | |
278 | |
279 _the_array_interfaces_array = oopFactory::new_system_objArray(2, CHECK); | |
280 _vm_exception = oopFactory::new_symbol("vm exception holder", CHECK); | |
281 } else { | |
282 FileMapInfo *mapinfo = FileMapInfo::current_info(); | |
283 char* buffer = mapinfo->region_base(CompactingPermGenGen::md); | |
284 void** vtbl_list = (void**)buffer; | |
285 init_self_patching_vtbl_list(vtbl_list, | |
286 CompactingPermGenGen::vtbl_list_size); | |
287 } | |
288 } | |
289 | |
290 vmSymbols::initialize(CHECK); | |
291 | |
292 SystemDictionary::initialize(CHECK); | |
293 | |
1142 | 294 klassOop ok = SystemDictionary::Object_klass(); |
0 | 295 |
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296 _the_null_string = StringTable::intern("null", CHECK); |
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297 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); |
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298 |
0 | 299 if (UseSharedSpaces) { |
300 // Verify shared interfaces array. | |
301 assert(_the_array_interfaces_array->obj_at(0) == | |
1142 | 302 SystemDictionary::Cloneable_klass(), "u3"); |
0 | 303 assert(_the_array_interfaces_array->obj_at(1) == |
1142 | 304 SystemDictionary::Serializable_klass(), "u3"); |
0 | 305 |
306 // Verify element klass for system obj array klass | |
307 assert(objArrayKlass::cast(_systemObjArrayKlassObj)->element_klass() == ok, "u1"); | |
308 assert(objArrayKlass::cast(_systemObjArrayKlassObj)->bottom_klass() == ok, "u2"); | |
309 | |
310 // Verify super class for the classes created above | |
311 assert(Klass::cast(boolArrayKlassObj() )->super() == ok, "u3"); | |
312 assert(Klass::cast(charArrayKlassObj() )->super() == ok, "u3"); | |
313 assert(Klass::cast(singleArrayKlassObj() )->super() == ok, "u3"); | |
314 assert(Klass::cast(doubleArrayKlassObj() )->super() == ok, "u3"); | |
315 assert(Klass::cast(byteArrayKlassObj() )->super() == ok, "u3"); | |
316 assert(Klass::cast(shortArrayKlassObj() )->super() == ok, "u3"); | |
317 assert(Klass::cast(intArrayKlassObj() )->super() == ok, "u3"); | |
318 assert(Klass::cast(longArrayKlassObj() )->super() == ok, "u3"); | |
319 assert(Klass::cast(constantPoolKlassObj() )->super() == ok, "u3"); | |
320 assert(Klass::cast(systemObjArrayKlassObj())->super() == ok, "u3"); | |
321 } else { | |
322 // Set up shared interfaces array. (Do this before supers are set up.) | |
1142 | 323 _the_array_interfaces_array->obj_at_put(0, SystemDictionary::Cloneable_klass()); |
324 _the_array_interfaces_array->obj_at_put(1, SystemDictionary::Serializable_klass()); | |
0 | 325 |
326 // Set element klass for system obj array klass | |
327 objArrayKlass::cast(_systemObjArrayKlassObj)->set_element_klass(ok); | |
328 objArrayKlass::cast(_systemObjArrayKlassObj)->set_bottom_klass(ok); | |
329 | |
330 // Set super class for the classes created above | |
331 Klass::cast(boolArrayKlassObj() )->initialize_supers(ok, CHECK); | |
332 Klass::cast(charArrayKlassObj() )->initialize_supers(ok, CHECK); | |
333 Klass::cast(singleArrayKlassObj() )->initialize_supers(ok, CHECK); | |
334 Klass::cast(doubleArrayKlassObj() )->initialize_supers(ok, CHECK); | |
335 Klass::cast(byteArrayKlassObj() )->initialize_supers(ok, CHECK); | |
336 Klass::cast(shortArrayKlassObj() )->initialize_supers(ok, CHECK); | |
337 Klass::cast(intArrayKlassObj() )->initialize_supers(ok, CHECK); | |
338 Klass::cast(longArrayKlassObj() )->initialize_supers(ok, CHECK); | |
339 Klass::cast(constantPoolKlassObj() )->initialize_supers(ok, CHECK); | |
340 Klass::cast(systemObjArrayKlassObj())->initialize_supers(ok, CHECK); | |
341 Klass::cast(boolArrayKlassObj() )->set_super(ok); | |
342 Klass::cast(charArrayKlassObj() )->set_super(ok); | |
343 Klass::cast(singleArrayKlassObj() )->set_super(ok); | |
344 Klass::cast(doubleArrayKlassObj() )->set_super(ok); | |
345 Klass::cast(byteArrayKlassObj() )->set_super(ok); | |
346 Klass::cast(shortArrayKlassObj() )->set_super(ok); | |
347 Klass::cast(intArrayKlassObj() )->set_super(ok); | |
348 Klass::cast(longArrayKlassObj() )->set_super(ok); | |
349 Klass::cast(constantPoolKlassObj() )->set_super(ok); | |
350 Klass::cast(systemObjArrayKlassObj())->set_super(ok); | |
351 } | |
352 | |
353 Klass::cast(boolArrayKlassObj() )->append_to_sibling_list(); | |
354 Klass::cast(charArrayKlassObj() )->append_to_sibling_list(); | |
355 Klass::cast(singleArrayKlassObj() )->append_to_sibling_list(); | |
356 Klass::cast(doubleArrayKlassObj() )->append_to_sibling_list(); | |
357 Klass::cast(byteArrayKlassObj() )->append_to_sibling_list(); | |
358 Klass::cast(shortArrayKlassObj() )->append_to_sibling_list(); | |
359 Klass::cast(intArrayKlassObj() )->append_to_sibling_list(); | |
360 Klass::cast(longArrayKlassObj() )->append_to_sibling_list(); | |
361 Klass::cast(constantPoolKlassObj() )->append_to_sibling_list(); | |
362 Klass::cast(systemObjArrayKlassObj())->append_to_sibling_list(); | |
363 } // end of core bootstrapping | |
364 | |
365 // Initialize _objectArrayKlass after core bootstraping to make | |
366 // sure the super class is set up properly for _objectArrayKlass. | |
367 _objectArrayKlassObj = instanceKlass:: | |
1142 | 368 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); |
0 | 369 // Add the class to the class hierarchy manually to make sure that |
370 // its vtable is initialized after core bootstrapping is completed. | |
371 Klass::cast(_objectArrayKlassObj)->append_to_sibling_list(); | |
372 | |
373 // Compute is_jdk version flags. | |
374 // Only 1.3 or later has the java.lang.Shutdown class. | |
375 // Only 1.4 or later has the java.lang.CharSequence interface. | |
376 // Only 1.5 or later has the java.lang.management.MemoryUsage class. | |
242 | 377 if (JDK_Version::is_partially_initialized()) { |
378 uint8_t jdk_version; | |
379 klassOop k = SystemDictionary::resolve_or_null( | |
380 vmSymbolHandles::java_lang_management_MemoryUsage(), THREAD); | |
0 | 381 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
382 if (k == NULL) { | |
242 | 383 k = SystemDictionary::resolve_or_null( |
384 vmSymbolHandles::java_lang_CharSequence(), THREAD); | |
0 | 385 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
386 if (k == NULL) { | |
242 | 387 k = SystemDictionary::resolve_or_null( |
388 vmSymbolHandles::java_lang_Shutdown(), THREAD); | |
0 | 389 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
390 if (k == NULL) { | |
242 | 391 jdk_version = 2; |
0 | 392 } else { |
242 | 393 jdk_version = 3; |
0 | 394 } |
395 } else { | |
242 | 396 jdk_version = 4; |
0 | 397 } |
398 } else { | |
242 | 399 jdk_version = 5; |
0 | 400 } |
242 | 401 JDK_Version::fully_initialize(jdk_version); |
0 | 402 } |
403 | |
404 #ifdef ASSERT | |
405 if (FullGCALot) { | |
406 // Allocate an array of dummy objects. | |
407 // We'd like these to be at the bottom of the old generation, | |
408 // so that when we free one and then collect, | |
409 // (almost) the whole heap moves | |
410 // and we find out if we actually update all the oops correctly. | |
411 // But we can't allocate directly in the old generation, | |
412 // so we allocate wherever, and hope that the first collection | |
413 // moves these objects to the bottom of the old generation. | |
414 // We can allocate directly in the permanent generation, so we do. | |
415 int size; | |
416 if (UseConcMarkSweepGC) { | |
417 warning("Using +FullGCALot with concurrent mark sweep gc " | |
418 "will not force all objects to relocate"); | |
419 size = FullGCALotDummies; | |
420 } else { | |
421 size = FullGCALotDummies * 2; | |
422 } | |
423 objArrayOop naked_array = oopFactory::new_system_objArray(size, CHECK); | |
424 objArrayHandle dummy_array(THREAD, naked_array); | |
425 int i = 0; | |
426 while (i < size) { | |
427 if (!UseConcMarkSweepGC) { | |
428 // Allocate dummy in old generation | |
1142 | 429 oop dummy = instanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); |
0 | 430 dummy_array->obj_at_put(i++, dummy); |
431 } | |
432 // Allocate dummy in permanent generation | |
1142 | 433 oop dummy = instanceKlass::cast(SystemDictionary::Object_klass())->allocate_permanent_instance(CHECK); |
0 | 434 dummy_array->obj_at_put(i++, dummy); |
435 } | |
436 { | |
437 // Only modify the global variable inside the mutex. | |
438 // If we had a race to here, the other dummy_array instances | |
439 // and their elements just get dropped on the floor, which is fine. | |
440 MutexLocker ml(FullGCALot_lock); | |
441 if (_fullgc_alot_dummy_array == NULL) { | |
442 _fullgc_alot_dummy_array = dummy_array(); | |
443 } | |
444 } | |
445 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); | |
446 } | |
447 #endif | |
448 } | |
449 | |
450 | |
451 static inline void add_vtable(void** list, int* n, Klass* o, int count) { | |
452 list[(*n)++] = *(void**)&o->vtbl_value(); | |
453 guarantee((*n) <= count, "vtable list too small."); | |
454 } | |
455 | |
456 | |
457 void Universe::init_self_patching_vtbl_list(void** list, int count) { | |
458 int n = 0; | |
459 { klassKlass o; add_vtable(list, &n, &o, count); } | |
460 { arrayKlassKlass o; add_vtable(list, &n, &o, count); } | |
461 { objArrayKlassKlass o; add_vtable(list, &n, &o, count); } | |
462 { instanceKlassKlass o; add_vtable(list, &n, &o, count); } | |
463 { instanceKlass o; add_vtable(list, &n, &o, count); } | |
464 { instanceRefKlass o; add_vtable(list, &n, &o, count); } | |
465 { typeArrayKlassKlass o; add_vtable(list, &n, &o, count); } | |
466 { symbolKlass o; add_vtable(list, &n, &o, count); } | |
467 { typeArrayKlass o; add_vtable(list, &n, &o, count); } | |
468 { methodKlass o; add_vtable(list, &n, &o, count); } | |
469 { constMethodKlass o; add_vtable(list, &n, &o, count); } | |
470 { constantPoolKlass o; add_vtable(list, &n, &o, count); } | |
471 { constantPoolCacheKlass o; add_vtable(list, &n, &o, count); } | |
472 { objArrayKlass o; add_vtable(list, &n, &o, count); } | |
473 { methodDataKlass o; add_vtable(list, &n, &o, count); } | |
474 { compiledICHolderKlass o; add_vtable(list, &n, &o, count); } | |
475 } | |
476 | |
477 | |
478 class FixupMirrorClosure: public ObjectClosure { | |
479 public: | |
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480 virtual void do_object(oop obj) { |
0 | 481 if (obj->is_klass()) { |
482 EXCEPTION_MARK; | |
483 KlassHandle k(THREAD, klassOop(obj)); | |
484 // We will never reach the CATCH below since Exceptions::_throw will cause | |
485 // the VM to exit if an exception is thrown during initialization | |
486 java_lang_Class::create_mirror(k, CATCH); | |
487 // This call unconditionally creates a new mirror for k, | |
488 // and links in k's component_mirror field if k is an array. | |
489 // If k is an objArray, k's element type must already have | |
490 // a mirror. In other words, this closure must process | |
491 // the component type of an objArray k before it processes k. | |
492 // This works because the permgen iterator presents arrays | |
493 // and their component types in order of creation. | |
494 } | |
495 } | |
496 }; | |
497 | |
498 void Universe::initialize_basic_type_mirrors(TRAPS) { | |
499 if (UseSharedSpaces) { | |
500 assert(_int_mirror != NULL, "already loaded"); | |
501 assert(_void_mirror == _mirrors[T_VOID], "consistently loaded"); | |
502 } else { | |
503 | |
504 assert(_int_mirror==NULL, "basic type mirrors already initialized"); | |
505 _int_mirror = | |
506 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); | |
507 _float_mirror = | |
508 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); | |
509 _double_mirror = | |
510 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); | |
511 _byte_mirror = | |
512 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); | |
513 _bool_mirror = | |
514 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); | |
515 _char_mirror = | |
516 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); | |
517 _long_mirror = | |
518 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); | |
519 _short_mirror = | |
520 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); | |
521 _void_mirror = | |
522 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); | |
523 | |
524 _mirrors[T_INT] = _int_mirror; | |
525 _mirrors[T_FLOAT] = _float_mirror; | |
526 _mirrors[T_DOUBLE] = _double_mirror; | |
527 _mirrors[T_BYTE] = _byte_mirror; | |
528 _mirrors[T_BOOLEAN] = _bool_mirror; | |
529 _mirrors[T_CHAR] = _char_mirror; | |
530 _mirrors[T_LONG] = _long_mirror; | |
531 _mirrors[T_SHORT] = _short_mirror; | |
532 _mirrors[T_VOID] = _void_mirror; | |
533 //_mirrors[T_OBJECT] = instanceKlass::cast(_object_klass)->java_mirror(); | |
534 //_mirrors[T_ARRAY] = instanceKlass::cast(_object_klass)->java_mirror(); | |
535 } | |
536 } | |
537 | |
538 void Universe::fixup_mirrors(TRAPS) { | |
539 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, | |
540 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply | |
541 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note | |
542 // that the number of objects allocated at this point is very small. | |
1142 | 543 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); |
0 | 544 FixupMirrorClosure blk; |
545 Universe::heap()->permanent_object_iterate(&blk); | |
546 } | |
547 | |
548 | |
549 static bool has_run_finalizers_on_exit = false; | |
550 | |
551 void Universe::run_finalizers_on_exit() { | |
552 if (has_run_finalizers_on_exit) return; | |
553 has_run_finalizers_on_exit = true; | |
554 | |
555 // Called on VM exit. This ought to be run in a separate thread. | |
556 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); | |
557 { | |
558 PRESERVE_EXCEPTION_MARK; | |
1142 | 559 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); |
0 | 560 JavaValue result(T_VOID); |
561 JavaCalls::call_static( | |
562 &result, | |
563 finalizer_klass, | |
564 vmSymbolHandles::run_finalizers_on_exit_name(), | |
565 vmSymbolHandles::void_method_signature(), | |
566 THREAD | |
567 ); | |
568 // Ignore any pending exceptions | |
569 CLEAR_PENDING_EXCEPTION; | |
570 } | |
571 } | |
572 | |
573 | |
574 // initialize_vtable could cause gc if | |
575 // 1) we specified true to initialize_vtable and | |
576 // 2) this ran after gc was enabled | |
577 // In case those ever change we use handles for oops | |
578 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { | |
579 // init vtable of k and all subclasses | |
580 Klass* ko = k_h()->klass_part(); | |
581 klassVtable* vt = ko->vtable(); | |
582 if (vt) vt->initialize_vtable(false, CHECK); | |
583 if (ko->oop_is_instance()) { | |
584 instanceKlass* ik = (instanceKlass*)ko; | |
585 for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->klass_part()->next_sibling())) { | |
586 reinitialize_vtable_of(s_h, CHECK); | |
587 } | |
588 } | |
589 } | |
590 | |
591 | |
592 void initialize_itable_for_klass(klassOop k, TRAPS) { | |
593 instanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); | |
594 } | |
595 | |
596 | |
597 void Universe::reinitialize_itables(TRAPS) { | |
598 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); | |
599 | |
600 } | |
601 | |
602 | |
603 bool Universe::on_page_boundary(void* addr) { | |
604 return ((uintptr_t) addr) % os::vm_page_size() == 0; | |
605 } | |
606 | |
607 | |
608 bool Universe::should_fill_in_stack_trace(Handle throwable) { | |
609 // never attempt to fill in the stack trace of preallocated errors that do not have | |
610 // backtrace. These errors are kept alive forever and may be "re-used" when all | |
611 // preallocated errors with backtrace have been consumed. Also need to avoid | |
612 // a potential loop which could happen if an out of memory occurs when attempting | |
613 // to allocate the backtrace. | |
614 return ((throwable() != Universe::_out_of_memory_error_java_heap) && | |
615 (throwable() != Universe::_out_of_memory_error_perm_gen) && | |
616 (throwable() != Universe::_out_of_memory_error_array_size) && | |
617 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); | |
618 } | |
619 | |
620 | |
621 oop Universe::gen_out_of_memory_error(oop default_err) { | |
622 // generate an out of memory error: | |
623 // - if there is a preallocated error with backtrace available then return it wth | |
624 // a filled in stack trace. | |
625 // - if there are no preallocated errors with backtrace available then return | |
626 // an error without backtrace. | |
627 int next; | |
628 if (_preallocated_out_of_memory_error_avail_count > 0) { | |
629 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); | |
630 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); | |
631 } else { | |
632 next = -1; | |
633 } | |
634 if (next < 0) { | |
635 // all preallocated errors have been used. | |
636 // return default | |
637 return default_err; | |
638 } else { | |
639 // get the error object at the slot and set set it to NULL so that the | |
640 // array isn't keeping it alive anymore. | |
641 oop exc = preallocated_out_of_memory_errors()->obj_at(next); | |
642 assert(exc != NULL, "slot has been used already"); | |
643 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); | |
644 | |
645 // use the message from the default error | |
646 oop msg = java_lang_Throwable::message(default_err); | |
647 assert(msg != NULL, "no message"); | |
648 java_lang_Throwable::set_message(exc, msg); | |
649 | |
650 // populate the stack trace and return it. | |
651 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); | |
652 return exc; | |
653 } | |
654 } | |
655 | |
656 static intptr_t non_oop_bits = 0; | |
657 | |
658 void* Universe::non_oop_word() { | |
659 // Neither the high bits nor the low bits of this value is allowed | |
660 // to look like (respectively) the high or low bits of a real oop. | |
661 // | |
662 // High and low are CPU-specific notions, but low always includes | |
663 // the low-order bit. Since oops are always aligned at least mod 4, | |
664 // setting the low-order bit will ensure that the low half of the | |
665 // word will never look like that of a real oop. | |
666 // | |
667 // Using the OS-supplied non-memory-address word (usually 0 or -1) | |
668 // will take care of the high bits, however many there are. | |
669 | |
670 if (non_oop_bits == 0) { | |
671 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; | |
672 } | |
673 | |
674 return (void*)non_oop_bits; | |
675 } | |
676 | |
677 jint universe_init() { | |
678 assert(!Universe::_fully_initialized, "called after initialize_vtables"); | |
679 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), | |
680 "LogHeapWordSize is incorrect."); | |
681 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); | |
682 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, | |
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683 "oop size is not not a multiple of HeapWord size"); |
0 | 684 TraceTime timer("Genesis", TraceStartupTime); |
685 GC_locker::lock(); // do not allow gc during bootstrapping | |
686 JavaClasses::compute_hard_coded_offsets(); | |
687 | |
688 // Get map info from shared archive file. | |
689 if (DumpSharedSpaces) | |
690 UseSharedSpaces = false; | |
691 | |
692 FileMapInfo* mapinfo = NULL; | |
693 if (UseSharedSpaces) { | |
694 mapinfo = NEW_C_HEAP_OBJ(FileMapInfo); | |
695 memset(mapinfo, 0, sizeof(FileMapInfo)); | |
696 | |
697 // Open the shared archive file, read and validate the header. If | |
698 // initialization files, shared spaces [UseSharedSpaces] are | |
699 // disabled and the file is closed. | |
700 | |
701 if (mapinfo->initialize()) { | |
702 FileMapInfo::set_current_info(mapinfo); | |
703 } else { | |
704 assert(!mapinfo->is_open() && !UseSharedSpaces, | |
705 "archive file not closed or shared spaces not disabled."); | |
706 } | |
707 } | |
708 | |
709 jint status = Universe::initialize_heap(); | |
710 if (status != JNI_OK) { | |
711 return status; | |
712 } | |
713 | |
714 // We have a heap so create the methodOop caches before | |
715 // CompactingPermGenGen::initialize_oops() tries to populate them. | |
716 Universe::_finalizer_register_cache = new LatestMethodOopCache(); | |
717 Universe::_loader_addClass_cache = new LatestMethodOopCache(); | |
718 Universe::_reflect_invoke_cache = new ActiveMethodOopsCache(); | |
719 | |
720 if (UseSharedSpaces) { | |
721 | |
722 // Read the data structures supporting the shared spaces (shared | |
723 // system dictionary, symbol table, etc.). After that, access to | |
724 // the file (other than the mapped regions) is no longer needed, and | |
725 // the file is closed. Closing the file does not affect the | |
726 // currently mapped regions. | |
727 | |
728 CompactingPermGenGen::initialize_oops(); | |
729 mapinfo->close(); | |
730 | |
731 } else { | |
732 SymbolTable::create_table(); | |
733 StringTable::create_table(); | |
734 ClassLoader::create_package_info_table(); | |
735 } | |
736 | |
737 return JNI_OK; | |
738 } | |
739 | |
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740 // Choose the heap base address and oop encoding mode |
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741 // when compressed oops are used: |
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742 // Unscaled - Use 32-bits oops without encoding when |
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743 // NarrowOopHeapBaseMin + heap_size < 4Gb |
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744 // ZeroBased - Use zero based compressed oops with encoding when |
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745 // NarrowOopHeapBaseMin + heap_size < 32Gb |
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746 // HeapBased - Use compressed oops with heap base + encoding. |
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747 |
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748 // 4Gb |
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749 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); |
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750 // 32Gb |
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751 // OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes; |
642
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752 |
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753 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) { |
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754 size_t base = 0; |
642
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755 #ifdef _LP64 |
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756 if (UseCompressedOops) { |
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757 assert(mode == UnscaledNarrowOop || |
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758 mode == ZeroBasedNarrowOop || |
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759 mode == HeapBasedNarrowOop, "mode is invalid"); |
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760 const size_t total_size = heap_size + HeapBaseMinAddress; |
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761 // Return specified base for the first request. |
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762 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { |
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763 base = HeapBaseMinAddress; |
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764 } else if (total_size <= OopEncodingHeapMax && (mode != HeapBasedNarrowOop)) { |
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765 if (total_size <= NarrowOopHeapMax && (mode == UnscaledNarrowOop) && |
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766 (Universe::narrow_oop_shift() == 0)) { |
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767 // Use 32-bits oops without encoding and |
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768 // place heap's top on the 4Gb boundary |
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769 base = (NarrowOopHeapMax - heap_size); |
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770 } else { |
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771 // Can't reserve with NarrowOopShift == 0 |
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772 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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773 if (mode == UnscaledNarrowOop || |
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774 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { |
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775 // Use zero based compressed oops with encoding and |
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776 // place heap's top on the 32Gb boundary in case |
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777 // total_size > 4Gb or failed to reserve below 4Gb. |
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778 base = (OopEncodingHeapMax - heap_size); |
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779 } |
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780 } |
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781 } else { |
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782 // Can't reserve below 32Gb. |
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783 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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784 } |
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785 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks |
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786 // used in ReservedHeapSpace() constructors. |
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787 // The final values will be set in initialize_heap() below. |
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788 if (base != 0 && (base + heap_size) <= OopEncodingHeapMax) { |
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789 // Use zero based compressed oops |
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790 Universe::set_narrow_oop_base(NULL); |
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791 // Don't need guard page for implicit checks in indexed |
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792 // addressing mode with zero based Compressed Oops. |
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793 Universe::set_narrow_oop_use_implicit_null_checks(true); |
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794 } else { |
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795 // Set to a non-NULL value so the ReservedSpace ctor computes |
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796 // the correct no-access prefix. |
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797 // The final value will be set in initialize_heap() below. |
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798 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); |
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799 #ifdef _WIN64 |
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800 if (UseLargePages) { |
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801 // Cannot allocate guard pages for implicit checks in indexed |
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802 // addressing mode when large pages are specified on windows. |
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803 Universe::set_narrow_oop_use_implicit_null_checks(false); |
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804 } |
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805 #endif // _WIN64 |
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806 } |
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807 } |
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808 #endif |
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809 return (char*)base; // also return NULL (don't care) for 32-bit VM |
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810 } |
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811 |
0 | 812 jint Universe::initialize_heap() { |
813 | |
814 if (UseParallelGC) { | |
815 #ifndef SERIALGC | |
816 Universe::_collectedHeap = new ParallelScavengeHeap(); | |
817 #else // SERIALGC | |
818 fatal("UseParallelGC not supported in java kernel vm."); | |
819 #endif // SERIALGC | |
820 | |
342
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821 } else if (UseG1GC) { |
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822 #ifndef SERIALGC |
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823 G1CollectorPolicy* g1p = new G1CollectorPolicy_BestRegionsFirst(); |
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824 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); |
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825 Universe::_collectedHeap = g1h; |
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826 #else // SERIALGC |
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827 fatal("UseG1GC not supported in java kernel vm."); |
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828 #endif // SERIALGC |
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829 |
0 | 830 } else { |
831 GenCollectorPolicy *gc_policy; | |
832 | |
833 if (UseSerialGC) { | |
834 gc_policy = new MarkSweepPolicy(); | |
835 } else if (UseConcMarkSweepGC) { | |
836 #ifndef SERIALGC | |
837 if (UseAdaptiveSizePolicy) { | |
838 gc_policy = new ASConcurrentMarkSweepPolicy(); | |
839 } else { | |
840 gc_policy = new ConcurrentMarkSweepPolicy(); | |
841 } | |
842 #else // SERIALGC | |
843 fatal("UseConcMarkSweepGC not supported in java kernel vm."); | |
844 #endif // SERIALGC | |
845 } else { // default old generation | |
846 gc_policy = new MarkSweepPolicy(); | |
847 } | |
848 | |
849 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); | |
850 } | |
851 | |
852 jint status = Universe::heap()->initialize(); | |
853 if (status != JNI_OK) { | |
854 return status; | |
855 } | |
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856 |
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857 #ifdef _LP64 |
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858 if (UseCompressedOops) { |
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859 // Subtract a page because something can get allocated at heap base. |
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860 // This also makes implicit null checking work, because the |
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861 // memory+1 page below heap_base needs to cause a signal. |
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862 // See needs_explicit_null_check. |
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863 // Only set the heap base for compressed oops because it indicates |
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864 // compressed oops for pstack code. |
642
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865 if (PrintCompressedOopsMode) { |
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866 tty->cr(); |
1963 | 867 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", |
868 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); | |
642
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869 } |
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870 if ((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax) { |
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871 // Can't reserve heap below 32Gb. |
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872 Universe::set_narrow_oop_base(Universe::heap()->base() - os::vm_page_size()); |
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873 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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874 if (PrintCompressedOopsMode) { |
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875 tty->print(", Compressed Oops with base: "PTR_FORMAT, Universe::narrow_oop_base()); |
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876 } |
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877 } else { |
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878 Universe::set_narrow_oop_base(0); |
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879 if (PrintCompressedOopsMode) { |
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880 tty->print(", zero based Compressed Oops"); |
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881 } |
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882 #ifdef _WIN64 |
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883 if (!Universe::narrow_oop_use_implicit_null_checks()) { |
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884 // Don't need guard page for implicit checks in indexed addressing |
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885 // mode with zero based Compressed Oops. |
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886 Universe::set_narrow_oop_use_implicit_null_checks(true); |
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887 } |
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888 #endif // _WIN64 |
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889 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { |
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890 // Can't reserve heap below 4Gb. |
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891 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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892 } else { |
922
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893 Universe::set_narrow_oop_shift(0); |
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894 if (PrintCompressedOopsMode) { |
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895 tty->print(", 32-bits Oops"); |
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896 } |
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897 } |
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898 } |
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899 if (PrintCompressedOopsMode) { |
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900 tty->cr(); |
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901 tty->cr(); |
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902 } |
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903 } |
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904 assert(Universe::narrow_oop_base() == (Universe::heap()->base() - os::vm_page_size()) || |
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905 Universe::narrow_oop_base() == NULL, "invalid value"); |
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906 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || |
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907 Universe::narrow_oop_shift() == 0, "invalid value"); |
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908 #endif |
0 | 909 |
910 // We will never reach the CATCH below since Exceptions::_throw will cause | |
911 // the VM to exit if an exception is thrown during initialization | |
912 | |
913 if (UseTLAB) { | |
914 assert(Universe::heap()->supports_tlab_allocation(), | |
915 "Should support thread-local allocation buffers"); | |
916 ThreadLocalAllocBuffer::startup_initialization(); | |
917 } | |
918 return JNI_OK; | |
919 } | |
920 | |
921 // It's the caller's repsonsibility to ensure glitch-freedom | |
922 // (if required). | |
923 void Universe::update_heap_info_at_gc() { | |
924 _heap_capacity_at_last_gc = heap()->capacity(); | |
925 _heap_used_at_last_gc = heap()->used(); | |
926 } | |
927 | |
928 | |
929 | |
930 void universe2_init() { | |
931 EXCEPTION_MARK; | |
932 Universe::genesis(CATCH); | |
933 // Although we'd like to verify here that the state of the heap | |
934 // is good, we can't because the main thread has not yet added | |
935 // itself to the threads list (so, using current interfaces | |
936 // we can't "fill" its TLAB), unless TLABs are disabled. | |
937 if (VerifyBeforeGC && !UseTLAB && | |
938 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
939 Universe::heap()->prepare_for_verify(); | |
940 Universe::verify(); // make sure we're starting with a clean slate | |
941 } | |
942 } | |
943 | |
944 | |
945 // This function is defined in JVM.cpp | |
946 extern void initialize_converter_functions(); | |
947 | |
948 bool universe_post_init() { | |
949 Universe::_fully_initialized = true; | |
950 EXCEPTION_MARK; | |
951 { ResourceMark rm; | |
952 Interpreter::initialize(); // needed for interpreter entry points | |
953 if (!UseSharedSpaces) { | |
1142 | 954 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); |
0 | 955 Universe::reinitialize_vtable_of(ok_h, CHECK_false); |
956 Universe::reinitialize_itables(CHECK_false); | |
957 } | |
958 } | |
959 | |
960 klassOop k; | |
961 instanceKlassHandle k_h; | |
962 if (!UseSharedSpaces) { | |
963 // Setup preallocated empty java.lang.Class array | |
1142 | 964 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); |
0 | 965 // Setup preallocated OutOfMemoryError errors |
966 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_OutOfMemoryError(), true, CHECK_false); | |
967 k_h = instanceKlassHandle(THREAD, k); | |
968 Universe::_out_of_memory_error_java_heap = k_h->allocate_permanent_instance(CHECK_false); | |
969 Universe::_out_of_memory_error_perm_gen = k_h->allocate_permanent_instance(CHECK_false); | |
970 Universe::_out_of_memory_error_array_size = k_h->allocate_permanent_instance(CHECK_false); | |
971 Universe::_out_of_memory_error_gc_overhead_limit = | |
972 k_h->allocate_permanent_instance(CHECK_false); | |
973 | |
974 // Setup preallocated NullPointerException | |
975 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
976 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_NullPointerException(), true, CHECK_false); | |
977 Universe::_null_ptr_exception_instance = instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); | |
978 // Setup preallocated ArithmeticException | |
979 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
980 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_ArithmeticException(), true, CHECK_false); | |
981 Universe::_arithmetic_exception_instance = instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); | |
982 // Virtual Machine Error for when we get into a situation we can't resolve | |
983 k = SystemDictionary::resolve_or_fail( | |
984 vmSymbolHandles::java_lang_VirtualMachineError(), true, CHECK_false); | |
985 bool linked = instanceKlass::cast(k)->link_class_or_fail(CHECK_false); | |
986 if (!linked) { | |
987 tty->print_cr("Unable to link/verify VirtualMachineError class"); | |
988 return false; // initialization failed | |
989 } | |
990 Universe::_virtual_machine_error_instance = | |
991 instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); | |
992 } | |
993 if (!DumpSharedSpaces) { | |
994 // These are the only Java fields that are currently set during shared space dumping. | |
995 // We prefer to not handle this generally, so we always reinitialize these detail messages. | |
996 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); | |
997 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); | |
998 | |
999 msg = java_lang_String::create_from_str("PermGen space", CHECK_false); | |
1000 java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg()); | |
1001 | |
1002 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); | |
1003 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); | |
1004 | |
1005 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); | |
1006 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); | |
1007 | |
1008 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); | |
1009 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); | |
1010 | |
1011 // Setup the array of errors that have preallocated backtrace | |
1012 k = Universe::_out_of_memory_error_java_heap->klass(); | |
1013 assert(k->klass_part()->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); | |
1014 k_h = instanceKlassHandle(THREAD, k); | |
1015 | |
1016 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; | |
1017 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); | |
1018 for (int i=0; i<len; i++) { | |
1019 oop err = k_h->allocate_permanent_instance(CHECK_false); | |
1020 Handle err_h = Handle(THREAD, err); | |
1021 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); | |
1022 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); | |
1023 } | |
1024 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; | |
1025 } | |
1026 | |
1027 | |
1028 // Setup static method for registering finalizers | |
1029 // The finalizer klass must be linked before looking up the method, in | |
1030 // case it needs to get rewritten. | |
1142 | 1031 instanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); |
1032 methodOop m = instanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( | |
0 | 1033 vmSymbols::register_method_name(), |
1034 vmSymbols::register_method_signature()); | |
1035 if (m == NULL || !m->is_static()) { | |
1036 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
1037 "java.lang.ref.Finalizer.register", false); | |
1038 } | |
1039 Universe::_finalizer_register_cache->init( | |
1142 | 1040 SystemDictionary::Finalizer_klass(), m, CHECK_false); |
0 | 1041 |
1042 // Resolve on first use and initialize class. | |
1043 // Note: No race-condition here, since a resolve will always return the same result | |
1044 | |
1045 // Setup method for security checks | |
1046 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_reflect_Method(), true, CHECK_false); | |
1047 k_h = instanceKlassHandle(THREAD, k); | |
1048 k_h->link_class(CHECK_false); | |
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1049 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_object_array_object_signature()); |
0 | 1050 if (m == NULL || m->is_static()) { |
1051 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
1052 "java.lang.reflect.Method.invoke", false); | |
1053 } | |
1054 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false); | |
1055 | |
1056 // Setup method for registering loaded classes in class loader vector | |
1142 | 1057 instanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); |
1058 m = instanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); | |
0 | 1059 if (m == NULL || m->is_static()) { |
1060 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
1061 "java.lang.ClassLoader.addClass", false); | |
1062 } | |
1063 Universe::_loader_addClass_cache->init( | |
1142 | 1064 SystemDictionary::ClassLoader_klass(), m, CHECK_false); |
0 | 1065 |
1066 // The folowing is initializing converter functions for serialization in | |
1067 // JVM.cpp. If we clean up the StrictMath code above we may want to find | |
1068 // a better solution for this as well. | |
1069 initialize_converter_functions(); | |
1070 | |
1071 // This needs to be done before the first scavenge/gc, since | |
1072 // it's an input to soft ref clearing policy. | |
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1073 { |
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1074 MutexLocker x(Heap_lock); |
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1075 Universe::update_heap_info_at_gc(); |
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1076 } |
0 | 1077 |
1078 // ("weak") refs processing infrastructure initialization | |
1079 Universe::heap()->post_initialize(); | |
1080 | |
1081 GC_locker::unlock(); // allow gc after bootstrapping | |
1082 | |
1083 MemoryService::set_universe_heap(Universe::_collectedHeap); | |
1084 return true; | |
1085 } | |
1086 | |
1087 | |
1088 void Universe::compute_base_vtable_size() { | |
1089 _base_vtable_size = ClassLoader::compute_Object_vtable(); | |
1090 } | |
1091 | |
1092 | |
1093 // %%% The Universe::flush_foo methods belong in CodeCache. | |
1094 | |
1095 // Flushes compiled methods dependent on dependee. | |
1096 void Universe::flush_dependents_on(instanceKlassHandle dependee) { | |
1097 assert_lock_strong(Compile_lock); | |
1098 | |
1099 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
1100 | |
1101 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1102 // stopped dring the safepoint so CodeCache will be safe to update without | |
1103 // holding the CodeCache_lock. | |
1104 | |
1105 DepChange changes(dependee); | |
1106 | |
1107 // Compute the dependent nmethods | |
1108 if (CodeCache::mark_for_deoptimization(changes) > 0) { | |
1109 // At least one nmethod has been marked for deoptimization | |
1110 VM_Deoptimize op; | |
1111 VMThread::execute(&op); | |
1112 } | |
1113 } | |
1114 | |
1115 #ifdef HOTSWAP | |
1116 // Flushes compiled methods dependent on dependee in the evolutionary sense | |
1117 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { | |
1118 // --- Compile_lock is not held. However we are at a safepoint. | |
1119 assert_locked_or_safepoint(Compile_lock); | |
1120 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
1121 | |
1122 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1123 // stopped dring the safepoint so CodeCache will be safe to update without | |
1124 // holding the CodeCache_lock. | |
1125 | |
1126 // Compute the dependent nmethods | |
1127 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { | |
1128 // At least one nmethod has been marked for deoptimization | |
1129 | |
1130 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
1131 // Stuff copied from VM_Deoptimize and modified slightly. | |
1132 | |
1133 // We do not want any GCs to happen while we are in the middle of this VM operation | |
1134 ResourceMark rm; | |
1135 DeoptimizationMarker dm; | |
1136 | |
1137 // Deoptimize all activations depending on marked nmethods | |
1138 Deoptimization::deoptimize_dependents(); | |
1139 | |
1140 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
1141 CodeCache::make_marked_nmethods_not_entrant(); | |
1142 } | |
1143 } | |
1144 #endif // HOTSWAP | |
1145 | |
1146 | |
1147 // Flushes compiled methods dependent on dependee | |
1148 void Universe::flush_dependents_on_method(methodHandle m_h) { | |
1149 // --- Compile_lock is not held. However we are at a safepoint. | |
1150 assert_locked_or_safepoint(Compile_lock); | |
1151 | |
1152 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1153 // stopped dring the safepoint so CodeCache will be safe to update without | |
1154 // holding the CodeCache_lock. | |
1155 | |
1156 // Compute the dependent nmethods | |
1157 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { | |
1158 // At least one nmethod has been marked for deoptimization | |
1159 | |
1160 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
1161 // Stuff copied from VM_Deoptimize and modified slightly. | |
1162 | |
1163 // We do not want any GCs to happen while we are in the middle of this VM operation | |
1164 ResourceMark rm; | |
1165 DeoptimizationMarker dm; | |
1166 | |
1167 // Deoptimize all activations depending on marked nmethods | |
1168 Deoptimization::deoptimize_dependents(); | |
1169 | |
1170 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
1171 CodeCache::make_marked_nmethods_not_entrant(); | |
1172 } | |
1173 } | |
1174 | |
1175 void Universe::print() { print_on(gclog_or_tty); } | |
1176 | |
1177 void Universe::print_on(outputStream* st) { | |
1178 st->print_cr("Heap"); | |
1179 heap()->print_on(st); | |
1180 } | |
1181 | |
1182 void Universe::print_heap_at_SIGBREAK() { | |
1183 if (PrintHeapAtSIGBREAK) { | |
1184 MutexLocker hl(Heap_lock); | |
1185 print_on(tty); | |
1186 tty->cr(); | |
1187 tty->flush(); | |
1188 } | |
1189 } | |
1190 | |
1191 void Universe::print_heap_before_gc(outputStream* st) { | |
1192 st->print_cr("{Heap before GC invocations=%u (full %u):", | |
1193 heap()->total_collections(), | |
1194 heap()->total_full_collections()); | |
1195 heap()->print_on(st); | |
1196 } | |
1197 | |
1198 void Universe::print_heap_after_gc(outputStream* st) { | |
1199 st->print_cr("Heap after GC invocations=%u (full %u):", | |
1200 heap()->total_collections(), | |
1201 heap()->total_full_collections()); | |
1202 heap()->print_on(st); | |
1203 st->print_cr("}"); | |
1204 } | |
1205 | |
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1206 void Universe::verify(bool allow_dirty, bool silent, bool option) { |
0 | 1207 if (SharedSkipVerify) { |
1208 return; | |
1209 } | |
1210 | |
1211 // The use of _verify_in_progress is a temporary work around for | |
1212 // 6320749. Don't bother with a creating a class to set and clear | |
1213 // it since it is only used in this method and the control flow is | |
1214 // straight forward. | |
1215 _verify_in_progress = true; | |
1216 | |
1217 COMPILER2_PRESENT( | |
1218 assert(!DerivedPointerTable::is_active(), | |
1219 "DPT should not be active during verification " | |
1220 "(of thread stacks below)"); | |
1221 ) | |
1222 | |
1223 ResourceMark rm; | |
1224 HandleMark hm; // Handles created during verification can be zapped | |
1225 _verify_count++; | |
1226 | |
1227 if (!silent) gclog_or_tty->print("[Verifying "); | |
1228 if (!silent) gclog_or_tty->print("threads "); | |
1229 Threads::verify(); | |
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1230 heap()->verify(allow_dirty, silent, option); |
0 | 1231 |
1232 if (!silent) gclog_or_tty->print("syms "); | |
1233 SymbolTable::verify(); | |
1234 if (!silent) gclog_or_tty->print("strs "); | |
1235 StringTable::verify(); | |
1236 { | |
1237 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
1238 if (!silent) gclog_or_tty->print("zone "); | |
1239 CodeCache::verify(); | |
1240 } | |
1241 if (!silent) gclog_or_tty->print("dict "); | |
1242 SystemDictionary::verify(); | |
1243 if (!silent) gclog_or_tty->print("hand "); | |
1244 JNIHandles::verify(); | |
1245 if (!silent) gclog_or_tty->print("C-heap "); | |
1246 os::check_heap(); | |
1247 if (!silent) gclog_or_tty->print_cr("]"); | |
1248 | |
1249 _verify_in_progress = false; | |
1250 } | |
1251 | |
1252 // Oop verification (see MacroAssembler::verify_oop) | |
1253 | |
1254 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; | |
1255 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; | |
1256 | |
1257 | |
1258 static void calculate_verify_data(uintptr_t verify_data[2], | |
1259 HeapWord* low_boundary, | |
1260 HeapWord* high_boundary) { | |
1261 assert(low_boundary < high_boundary, "bad interval"); | |
1262 | |
1263 // decide which low-order bits we require to be clear: | |
1264 size_t alignSize = MinObjAlignmentInBytes; | |
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1265 size_t min_object_size = CollectedHeap::min_fill_size(); |
0 | 1266 |
1267 // make an inclusive limit: | |
1268 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; | |
1269 uintptr_t min = (uintptr_t)low_boundary; | |
1270 assert(min < max, "bad interval"); | |
1271 uintptr_t diff = max ^ min; | |
1272 | |
1273 // throw away enough low-order bits to make the diff vanish | |
1274 uintptr_t mask = (uintptr_t)(-1); | |
1275 while ((mask & diff) != 0) | |
1276 mask <<= 1; | |
1277 uintptr_t bits = (min & mask); | |
1278 assert(bits == (max & mask), "correct mask"); | |
1279 // check an intermediate value between min and max, just to make sure: | |
1280 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); | |
1281 | |
1282 // require address alignment, too: | |
1283 mask |= (alignSize - 1); | |
1284 | |
1285 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { | |
1286 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); | |
1287 } | |
1288 verify_data[0] = mask; | |
1289 verify_data[1] = bits; | |
1290 } | |
1291 | |
1292 | |
1293 // Oop verification (see MacroAssembler::verify_oop) | |
1294 #ifndef PRODUCT | |
1295 | |
1296 uintptr_t Universe::verify_oop_mask() { | |
1297 MemRegion m = heap()->reserved_region(); | |
1298 calculate_verify_data(_verify_oop_data, | |
1299 m.start(), | |
1300 m.end()); | |
1301 return _verify_oop_data[0]; | |
1302 } | |
1303 | |
1304 | |
1305 | |
1306 uintptr_t Universe::verify_oop_bits() { | |
1307 verify_oop_mask(); | |
1308 return _verify_oop_data[1]; | |
1309 } | |
1310 | |
1311 | |
1312 uintptr_t Universe::verify_klass_mask() { | |
1313 /* $$$ | |
1314 // A klass can never live in the new space. Since the new and old | |
1315 // spaces can change size, we must settle for bounds-checking against | |
1316 // the bottom of the world, plus the smallest possible new and old | |
1317 // space sizes that may arise during execution. | |
1318 size_t min_new_size = Universe::new_size(); // in bytes | |
1319 size_t min_old_size = Universe::old_size(); // in bytes | |
1320 calculate_verify_data(_verify_klass_data, | |
1321 (HeapWord*)((uintptr_t)_new_gen->low_boundary + min_new_size + min_old_size), | |
1322 _perm_gen->high_boundary); | |
1323 */ | |
1324 // Why doesn't the above just say that klass's always live in the perm | |
1325 // gen? I'll see if that seems to work... | |
1326 MemRegion permanent_reserved; | |
1327 switch (Universe::heap()->kind()) { | |
1328 default: | |
1329 // ???: What if a CollectedHeap doesn't have a permanent generation? | |
1330 ShouldNotReachHere(); | |
1331 break; | |
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1332 case CollectedHeap::GenCollectedHeap: |
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1333 case CollectedHeap::G1CollectedHeap: { |
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1334 SharedHeap* sh = (SharedHeap*) Universe::heap(); |
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1335 permanent_reserved = sh->perm_gen()->reserved(); |
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1336 break; |
0 | 1337 } |
1338 #ifndef SERIALGC | |
1339 case CollectedHeap::ParallelScavengeHeap: { | |
1340 ParallelScavengeHeap* psh = (ParallelScavengeHeap*) Universe::heap(); | |
1341 permanent_reserved = psh->perm_gen()->reserved(); | |
1342 break; | |
1343 } | |
1344 #endif // SERIALGC | |
1345 } | |
1346 calculate_verify_data(_verify_klass_data, | |
1347 permanent_reserved.start(), | |
1348 permanent_reserved.end()); | |
1349 | |
1350 return _verify_klass_data[0]; | |
1351 } | |
1352 | |
1353 | |
1354 | |
1355 uintptr_t Universe::verify_klass_bits() { | |
1356 verify_klass_mask(); | |
1357 return _verify_klass_data[1]; | |
1358 } | |
1359 | |
1360 | |
1361 uintptr_t Universe::verify_mark_mask() { | |
1362 return markOopDesc::lock_mask_in_place; | |
1363 } | |
1364 | |
1365 | |
1366 | |
1367 uintptr_t Universe::verify_mark_bits() { | |
1368 intptr_t mask = verify_mark_mask(); | |
1369 intptr_t bits = (intptr_t)markOopDesc::prototype(); | |
1370 assert((bits & ~mask) == 0, "no stray header bits"); | |
1371 return bits; | |
1372 } | |
1373 #endif // PRODUCT | |
1374 | |
1375 | |
1376 void Universe::compute_verify_oop_data() { | |
1377 verify_oop_mask(); | |
1378 verify_oop_bits(); | |
1379 verify_mark_mask(); | |
1380 verify_mark_bits(); | |
1381 verify_klass_mask(); | |
1382 verify_klass_bits(); | |
1383 } | |
1384 | |
1385 | |
1386 void CommonMethodOopCache::init(klassOop k, methodOop m, TRAPS) { | |
1387 if (!UseSharedSpaces) { | |
1388 _klass = k; | |
1389 } | |
1390 #ifndef PRODUCT | |
1391 else { | |
1392 // sharing initilization should have already set up _klass | |
1393 assert(_klass != NULL, "just checking"); | |
1394 } | |
1395 #endif | |
1396 | |
1397 _method_idnum = m->method_idnum(); | |
1398 assert(_method_idnum >= 0, "sanity check"); | |
1399 } | |
1400 | |
1401 | |
1402 ActiveMethodOopsCache::~ActiveMethodOopsCache() { | |
1403 if (_prev_methods != NULL) { | |
1404 for (int i = _prev_methods->length() - 1; i >= 0; i--) { | |
1405 jweak method_ref = _prev_methods->at(i); | |
1406 if (method_ref != NULL) { | |
1407 JNIHandles::destroy_weak_global(method_ref); | |
1408 } | |
1409 } | |
1410 delete _prev_methods; | |
1411 _prev_methods = NULL; | |
1412 } | |
1413 } | |
1414 | |
1415 | |
1416 void ActiveMethodOopsCache::add_previous_version(const methodOop method) { | |
1417 assert(Thread::current()->is_VM_thread(), | |
1418 "only VMThread can add previous versions"); | |
1419 | |
1420 if (_prev_methods == NULL) { | |
1421 // This is the first previous version so make some space. | |
1422 // Start with 2 elements under the assumption that the class | |
1423 // won't be redefined much. | |
1424 _prev_methods = new (ResourceObj::C_HEAP) GrowableArray<jweak>(2, true); | |
1425 } | |
1426 | |
1427 // RC_TRACE macro has an embedded ResourceMark | |
1428 RC_TRACE(0x00000100, | |
1429 ("add: %s(%s): adding prev version ref for cached method @%d", | |
1430 method->name()->as_C_string(), method->signature()->as_C_string(), | |
1431 _prev_methods->length())); | |
1432 | |
1433 methodHandle method_h(method); | |
1434 jweak method_ref = JNIHandles::make_weak_global(method_h); | |
1435 _prev_methods->append(method_ref); | |
1436 | |
1437 // Using weak references allows previous versions of the cached | |
1438 // method to be GC'ed when they are no longer needed. Since the | |
1439 // caller is the VMThread and we are at a safepoint, this is a good | |
1440 // time to clear out unused weak references. | |
1441 | |
1442 for (int i = _prev_methods->length() - 1; i >= 0; i--) { | |
1443 jweak method_ref = _prev_methods->at(i); | |
1444 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); | |
1445 if (method_ref == NULL) { | |
1446 _prev_methods->remove_at(i); | |
1447 // Since we are traversing the array backwards, we don't have to | |
1448 // do anything special with the index. | |
1449 continue; // robustness | |
1450 } | |
1451 | |
1452 methodOop m = (methodOop)JNIHandles::resolve(method_ref); | |
1453 if (m == NULL) { | |
1454 // this method entry has been GC'ed so remove it | |
1455 JNIHandles::destroy_weak_global(method_ref); | |
1456 _prev_methods->remove_at(i); | |
1457 } else { | |
1458 // RC_TRACE macro has an embedded ResourceMark | |
1459 RC_TRACE(0x00000400, ("add: %s(%s): previous cached method @%d is alive", | |
1460 m->name()->as_C_string(), m->signature()->as_C_string(), i)); | |
1461 } | |
1462 } | |
1463 } // end add_previous_version() | |
1464 | |
1465 | |
1466 bool ActiveMethodOopsCache::is_same_method(const methodOop method) const { | |
1467 instanceKlass* ik = instanceKlass::cast(klass()); | |
1468 methodOop check_method = ik->method_with_idnum(method_idnum()); | |
1469 assert(check_method != NULL, "sanity check"); | |
1470 if (check_method == method) { | |
1471 // done with the easy case | |
1472 return true; | |
1473 } | |
1474 | |
1475 if (_prev_methods != NULL) { | |
1476 // The cached method has been redefined at least once so search | |
1477 // the previous versions for a match. | |
1478 for (int i = 0; i < _prev_methods->length(); i++) { | |
1479 jweak method_ref = _prev_methods->at(i); | |
1480 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); | |
1481 if (method_ref == NULL) { | |
1482 continue; // robustness | |
1483 } | |
1484 | |
1485 check_method = (methodOop)JNIHandles::resolve(method_ref); | |
1486 if (check_method == method) { | |
1487 // a previous version matches | |
1488 return true; | |
1489 } | |
1490 } | |
1491 } | |
1492 | |
1493 // either no previous versions or no previous version matched | |
1494 return false; | |
1495 } | |
1496 | |
1497 | |
1498 methodOop LatestMethodOopCache::get_methodOop() { | |
1499 instanceKlass* ik = instanceKlass::cast(klass()); | |
1500 methodOop m = ik->method_with_idnum(method_idnum()); | |
1501 assert(m != NULL, "sanity check"); | |
1502 return m; | |
1503 } | |
1504 | |
1505 | |
1506 #ifdef ASSERT | |
1507 // Release dummy object(s) at bottom of heap | |
1508 bool Universe::release_fullgc_alot_dummy() { | |
1509 MutexLocker ml(FullGCALot_lock); | |
1510 if (_fullgc_alot_dummy_array != NULL) { | |
1511 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { | |
1512 // No more dummies to release, release entire array instead | |
1513 _fullgc_alot_dummy_array = NULL; | |
1514 return false; | |
1515 } | |
1516 if (!UseConcMarkSweepGC) { | |
1517 // Release dummy at bottom of old generation | |
1518 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
1519 } | |
1520 // Release dummy at bottom of permanent generation | |
1521 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
1522 } | |
1523 return true; | |
1524 } | |
1525 | |
1526 #endif // ASSERT |