Mercurial > hg > truffle
annotate src/share/vm/memory/universe.cpp @ 832:e7d5557ad624
Merge
author | jmasa |
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date | Thu, 02 Jul 2009 16:28:15 -0700 |
parents | bd441136a5ce |
children | df6caf649ff7 |
rev | line source |
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0 | 1 /* |
579 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
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; | |
70 LatestMethodOopCache* Universe::_finalizer_register_cache = NULL; | |
71 LatestMethodOopCache* Universe::_loader_addClass_cache = NULL; | |
72 ActiveMethodOopsCache* Universe::_reflect_invoke_cache = NULL; | |
73 oop Universe::_out_of_memory_error_java_heap = NULL; | |
74 oop Universe::_out_of_memory_error_perm_gen = NULL; | |
75 oop Universe::_out_of_memory_error_array_size = NULL; | |
76 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; | |
77 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; | |
78 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; | |
79 bool Universe::_verify_in_progress = false; | |
80 oop Universe::_null_ptr_exception_instance = NULL; | |
81 oop Universe::_arithmetic_exception_instance = NULL; | |
82 oop Universe::_virtual_machine_error_instance = NULL; | |
83 oop Universe::_vm_exception = NULL; | |
84 oop Universe::_emptySymbol = NULL; | |
85 | |
86 // These variables are guarded by FullGCALot_lock. | |
87 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) | |
88 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) | |
89 | |
90 | |
91 // Heap | |
92 int Universe::_verify_count = 0; | |
93 | |
94 int Universe::_base_vtable_size = 0; | |
95 bool Universe::_bootstrapping = false; | |
96 bool Universe::_fully_initialized = false; | |
97 | |
98 size_t Universe::_heap_capacity_at_last_gc; | |
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99 size_t Universe::_heap_used_at_last_gc = 0; |
0 | 100 |
101 CollectedHeap* Universe::_collectedHeap = NULL; | |
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102 |
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103 NarrowOopStruct Universe::_narrow_oop = { NULL, 0, true }; |
0 | 104 |
105 | |
106 void Universe::basic_type_classes_do(void f(klassOop)) { | |
107 f(boolArrayKlassObj()); | |
108 f(byteArrayKlassObj()); | |
109 f(charArrayKlassObj()); | |
110 f(intArrayKlassObj()); | |
111 f(shortArrayKlassObj()); | |
112 f(longArrayKlassObj()); | |
113 f(singleArrayKlassObj()); | |
114 f(doubleArrayKlassObj()); | |
115 } | |
116 | |
117 | |
118 void Universe::system_classes_do(void f(klassOop)) { | |
119 f(symbolKlassObj()); | |
120 f(methodKlassObj()); | |
121 f(constMethodKlassObj()); | |
122 f(methodDataKlassObj()); | |
123 f(klassKlassObj()); | |
124 f(arrayKlassKlassObj()); | |
125 f(objArrayKlassKlassObj()); | |
126 f(typeArrayKlassKlassObj()); | |
127 f(instanceKlassKlassObj()); | |
128 f(constantPoolKlassObj()); | |
129 f(systemObjArrayKlassObj()); | |
130 } | |
131 | |
132 void Universe::oops_do(OopClosure* f, bool do_all) { | |
133 | |
134 f->do_oop((oop*) &_int_mirror); | |
135 f->do_oop((oop*) &_float_mirror); | |
136 f->do_oop((oop*) &_double_mirror); | |
137 f->do_oop((oop*) &_byte_mirror); | |
138 f->do_oop((oop*) &_bool_mirror); | |
139 f->do_oop((oop*) &_char_mirror); | |
140 f->do_oop((oop*) &_long_mirror); | |
141 f->do_oop((oop*) &_short_mirror); | |
142 f->do_oop((oop*) &_void_mirror); | |
143 | |
144 // It's important to iterate over these guys even if they are null, | |
145 // since that's how shared heaps are restored. | |
146 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { | |
147 f->do_oop((oop*) &_mirrors[i]); | |
148 } | |
149 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); | |
150 | |
151 // %%% Consider moving those "shared oops" over here with the others. | |
152 f->do_oop((oop*)&_boolArrayKlassObj); | |
153 f->do_oop((oop*)&_byteArrayKlassObj); | |
154 f->do_oop((oop*)&_charArrayKlassObj); | |
155 f->do_oop((oop*)&_intArrayKlassObj); | |
156 f->do_oop((oop*)&_shortArrayKlassObj); | |
157 f->do_oop((oop*)&_longArrayKlassObj); | |
158 f->do_oop((oop*)&_singleArrayKlassObj); | |
159 f->do_oop((oop*)&_doubleArrayKlassObj); | |
160 f->do_oop((oop*)&_objectArrayKlassObj); | |
161 { | |
162 for (int i = 0; i < T_VOID+1; i++) { | |
163 if (_typeArrayKlassObjs[i] != NULL) { | |
164 assert(i >= T_BOOLEAN, "checking"); | |
165 f->do_oop((oop*)&_typeArrayKlassObjs[i]); | |
166 } else if (do_all) { | |
167 f->do_oop((oop*)&_typeArrayKlassObjs[i]); | |
168 } | |
169 } | |
170 } | |
171 f->do_oop((oop*)&_symbolKlassObj); | |
172 f->do_oop((oop*)&_methodKlassObj); | |
173 f->do_oop((oop*)&_constMethodKlassObj); | |
174 f->do_oop((oop*)&_methodDataKlassObj); | |
175 f->do_oop((oop*)&_klassKlassObj); | |
176 f->do_oop((oop*)&_arrayKlassKlassObj); | |
177 f->do_oop((oop*)&_objArrayKlassKlassObj); | |
178 f->do_oop((oop*)&_typeArrayKlassKlassObj); | |
179 f->do_oop((oop*)&_instanceKlassKlassObj); | |
180 f->do_oop((oop*)&_constantPoolKlassObj); | |
181 f->do_oop((oop*)&_constantPoolCacheKlassObj); | |
182 f->do_oop((oop*)&_compiledICHolderKlassObj); | |
183 f->do_oop((oop*)&_systemObjArrayKlassObj); | |
184 f->do_oop((oop*)&_the_empty_byte_array); | |
185 f->do_oop((oop*)&_the_empty_short_array); | |
186 f->do_oop((oop*)&_the_empty_int_array); | |
187 f->do_oop((oop*)&_the_empty_system_obj_array); | |
188 f->do_oop((oop*)&_the_empty_class_klass_array); | |
189 f->do_oop((oop*)&_the_array_interfaces_array); | |
190 _finalizer_register_cache->oops_do(f); | |
191 _loader_addClass_cache->oops_do(f); | |
192 _reflect_invoke_cache->oops_do(f); | |
193 f->do_oop((oop*)&_out_of_memory_error_java_heap); | |
194 f->do_oop((oop*)&_out_of_memory_error_perm_gen); | |
195 f->do_oop((oop*)&_out_of_memory_error_array_size); | |
196 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); | |
197 if (_preallocated_out_of_memory_error_array != (oop)NULL) { // NULL when DumpSharedSpaces | |
198 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); | |
199 } | |
200 f->do_oop((oop*)&_null_ptr_exception_instance); | |
201 f->do_oop((oop*)&_arithmetic_exception_instance); | |
202 f->do_oop((oop*)&_virtual_machine_error_instance); | |
203 f->do_oop((oop*)&_main_thread_group); | |
204 f->do_oop((oop*)&_system_thread_group); | |
205 f->do_oop((oop*)&_vm_exception); | |
206 f->do_oop((oop*)&_emptySymbol); | |
207 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) | |
208 } | |
209 | |
210 | |
211 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { | |
212 if (size < alignment || size % alignment != 0) { | |
213 ResourceMark rm; | |
214 stringStream st; | |
215 st.print("Size of %s (%ld bytes) must be aligned to %ld bytes", name, size, alignment); | |
216 char* error = st.as_string(); | |
217 vm_exit_during_initialization(error); | |
218 } | |
219 } | |
220 | |
221 | |
222 void Universe::genesis(TRAPS) { | |
223 ResourceMark rm; | |
224 { FlagSetting fs(_bootstrapping, true); | |
225 | |
226 { MutexLocker mc(Compile_lock); | |
227 | |
228 // determine base vtable size; without that we cannot create the array klasses | |
229 compute_base_vtable_size(); | |
230 | |
231 if (!UseSharedSpaces) { | |
232 _klassKlassObj = klassKlass::create_klass(CHECK); | |
233 _arrayKlassKlassObj = arrayKlassKlass::create_klass(CHECK); | |
234 | |
235 _objArrayKlassKlassObj = objArrayKlassKlass::create_klass(CHECK); | |
236 _instanceKlassKlassObj = instanceKlassKlass::create_klass(CHECK); | |
237 _typeArrayKlassKlassObj = typeArrayKlassKlass::create_klass(CHECK); | |
238 | |
239 _symbolKlassObj = symbolKlass::create_klass(CHECK); | |
240 | |
241 _emptySymbol = oopFactory::new_symbol("", CHECK); | |
242 | |
243 _boolArrayKlassObj = typeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); | |
244 _charArrayKlassObj = typeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); | |
245 _singleArrayKlassObj = typeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); | |
246 _doubleArrayKlassObj = typeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); | |
247 _byteArrayKlassObj = typeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); | |
248 _shortArrayKlassObj = typeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); | |
249 _intArrayKlassObj = typeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); | |
250 _longArrayKlassObj = typeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); | |
251 | |
252 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; | |
253 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; | |
254 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; | |
255 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; | |
256 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; | |
257 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; | |
258 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; | |
259 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; | |
260 | |
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261 _methodKlassObj = methodKlass::create_klass(CHECK); |
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262 _constMethodKlassObj = constMethodKlass::create_klass(CHECK); |
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263 _methodDataKlassObj = methodDataKlass::create_klass(CHECK); |
0 | 264 _constantPoolKlassObj = constantPoolKlass::create_klass(CHECK); |
265 _constantPoolCacheKlassObj = constantPoolCacheKlass::create_klass(CHECK); | |
266 | |
267 _compiledICHolderKlassObj = compiledICHolderKlass::create_klass(CHECK); | |
268 _systemObjArrayKlassObj = objArrayKlassKlass::cast(objArrayKlassKlassObj())->allocate_system_objArray_klass(CHECK); | |
269 | |
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270 _the_empty_byte_array = oopFactory::new_permanent_byteArray(0, CHECK); |
0 | 271 _the_empty_short_array = oopFactory::new_permanent_shortArray(0, CHECK); |
272 _the_empty_int_array = oopFactory::new_permanent_intArray(0, CHECK); | |
273 _the_empty_system_obj_array = oopFactory::new_system_objArray(0, CHECK); | |
274 | |
275 _the_array_interfaces_array = oopFactory::new_system_objArray(2, CHECK); | |
276 _vm_exception = oopFactory::new_symbol("vm exception holder", CHECK); | |
277 } else { | |
278 FileMapInfo *mapinfo = FileMapInfo::current_info(); | |
279 char* buffer = mapinfo->region_base(CompactingPermGenGen::md); | |
280 void** vtbl_list = (void**)buffer; | |
281 init_self_patching_vtbl_list(vtbl_list, | |
282 CompactingPermGenGen::vtbl_list_size); | |
283 } | |
284 } | |
285 | |
286 vmSymbols::initialize(CHECK); | |
287 | |
288 SystemDictionary::initialize(CHECK); | |
289 | |
290 klassOop ok = SystemDictionary::object_klass(); | |
291 | |
292 if (UseSharedSpaces) { | |
293 // Verify shared interfaces array. | |
294 assert(_the_array_interfaces_array->obj_at(0) == | |
295 SystemDictionary::cloneable_klass(), "u3"); | |
296 assert(_the_array_interfaces_array->obj_at(1) == | |
297 SystemDictionary::serializable_klass(), "u3"); | |
298 | |
299 // Verify element klass for system obj array klass | |
300 assert(objArrayKlass::cast(_systemObjArrayKlassObj)->element_klass() == ok, "u1"); | |
301 assert(objArrayKlass::cast(_systemObjArrayKlassObj)->bottom_klass() == ok, "u2"); | |
302 | |
303 // Verify super class for the classes created above | |
304 assert(Klass::cast(boolArrayKlassObj() )->super() == ok, "u3"); | |
305 assert(Klass::cast(charArrayKlassObj() )->super() == ok, "u3"); | |
306 assert(Klass::cast(singleArrayKlassObj() )->super() == ok, "u3"); | |
307 assert(Klass::cast(doubleArrayKlassObj() )->super() == ok, "u3"); | |
308 assert(Klass::cast(byteArrayKlassObj() )->super() == ok, "u3"); | |
309 assert(Klass::cast(shortArrayKlassObj() )->super() == ok, "u3"); | |
310 assert(Klass::cast(intArrayKlassObj() )->super() == ok, "u3"); | |
311 assert(Klass::cast(longArrayKlassObj() )->super() == ok, "u3"); | |
312 assert(Klass::cast(constantPoolKlassObj() )->super() == ok, "u3"); | |
313 assert(Klass::cast(systemObjArrayKlassObj())->super() == ok, "u3"); | |
314 } else { | |
315 // Set up shared interfaces array. (Do this before supers are set up.) | |
316 _the_array_interfaces_array->obj_at_put(0, SystemDictionary::cloneable_klass()); | |
317 _the_array_interfaces_array->obj_at_put(1, SystemDictionary::serializable_klass()); | |
318 | |
319 // Set element klass for system obj array klass | |
320 objArrayKlass::cast(_systemObjArrayKlassObj)->set_element_klass(ok); | |
321 objArrayKlass::cast(_systemObjArrayKlassObj)->set_bottom_klass(ok); | |
322 | |
323 // Set super class for the classes created above | |
324 Klass::cast(boolArrayKlassObj() )->initialize_supers(ok, CHECK); | |
325 Klass::cast(charArrayKlassObj() )->initialize_supers(ok, CHECK); | |
326 Klass::cast(singleArrayKlassObj() )->initialize_supers(ok, CHECK); | |
327 Klass::cast(doubleArrayKlassObj() )->initialize_supers(ok, CHECK); | |
328 Klass::cast(byteArrayKlassObj() )->initialize_supers(ok, CHECK); | |
329 Klass::cast(shortArrayKlassObj() )->initialize_supers(ok, CHECK); | |
330 Klass::cast(intArrayKlassObj() )->initialize_supers(ok, CHECK); | |
331 Klass::cast(longArrayKlassObj() )->initialize_supers(ok, CHECK); | |
332 Klass::cast(constantPoolKlassObj() )->initialize_supers(ok, CHECK); | |
333 Klass::cast(systemObjArrayKlassObj())->initialize_supers(ok, CHECK); | |
334 Klass::cast(boolArrayKlassObj() )->set_super(ok); | |
335 Klass::cast(charArrayKlassObj() )->set_super(ok); | |
336 Klass::cast(singleArrayKlassObj() )->set_super(ok); | |
337 Klass::cast(doubleArrayKlassObj() )->set_super(ok); | |
338 Klass::cast(byteArrayKlassObj() )->set_super(ok); | |
339 Klass::cast(shortArrayKlassObj() )->set_super(ok); | |
340 Klass::cast(intArrayKlassObj() )->set_super(ok); | |
341 Klass::cast(longArrayKlassObj() )->set_super(ok); | |
342 Klass::cast(constantPoolKlassObj() )->set_super(ok); | |
343 Klass::cast(systemObjArrayKlassObj())->set_super(ok); | |
344 } | |
345 | |
346 Klass::cast(boolArrayKlassObj() )->append_to_sibling_list(); | |
347 Klass::cast(charArrayKlassObj() )->append_to_sibling_list(); | |
348 Klass::cast(singleArrayKlassObj() )->append_to_sibling_list(); | |
349 Klass::cast(doubleArrayKlassObj() )->append_to_sibling_list(); | |
350 Klass::cast(byteArrayKlassObj() )->append_to_sibling_list(); | |
351 Klass::cast(shortArrayKlassObj() )->append_to_sibling_list(); | |
352 Klass::cast(intArrayKlassObj() )->append_to_sibling_list(); | |
353 Klass::cast(longArrayKlassObj() )->append_to_sibling_list(); | |
354 Klass::cast(constantPoolKlassObj() )->append_to_sibling_list(); | |
355 Klass::cast(systemObjArrayKlassObj())->append_to_sibling_list(); | |
356 } // end of core bootstrapping | |
357 | |
358 // Initialize _objectArrayKlass after core bootstraping to make | |
359 // sure the super class is set up properly for _objectArrayKlass. | |
360 _objectArrayKlassObj = instanceKlass:: | |
361 cast(SystemDictionary::object_klass())->array_klass(1, CHECK); | |
362 // Add the class to the class hierarchy manually to make sure that | |
363 // its vtable is initialized after core bootstrapping is completed. | |
364 Klass::cast(_objectArrayKlassObj)->append_to_sibling_list(); | |
365 | |
366 // Compute is_jdk version flags. | |
367 // Only 1.3 or later has the java.lang.Shutdown class. | |
368 // Only 1.4 or later has the java.lang.CharSequence interface. | |
369 // Only 1.5 or later has the java.lang.management.MemoryUsage class. | |
242 | 370 if (JDK_Version::is_partially_initialized()) { |
371 uint8_t jdk_version; | |
372 klassOop k = SystemDictionary::resolve_or_null( | |
373 vmSymbolHandles::java_lang_management_MemoryUsage(), THREAD); | |
0 | 374 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
375 if (k == NULL) { | |
242 | 376 k = SystemDictionary::resolve_or_null( |
377 vmSymbolHandles::java_lang_CharSequence(), THREAD); | |
0 | 378 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
379 if (k == NULL) { | |
242 | 380 k = SystemDictionary::resolve_or_null( |
381 vmSymbolHandles::java_lang_Shutdown(), THREAD); | |
0 | 382 CLEAR_PENDING_EXCEPTION; // ignore exceptions |
383 if (k == NULL) { | |
242 | 384 jdk_version = 2; |
0 | 385 } else { |
242 | 386 jdk_version = 3; |
0 | 387 } |
388 } else { | |
242 | 389 jdk_version = 4; |
0 | 390 } |
391 } else { | |
242 | 392 jdk_version = 5; |
0 | 393 } |
242 | 394 JDK_Version::fully_initialize(jdk_version); |
0 | 395 } |
396 | |
397 #ifdef ASSERT | |
398 if (FullGCALot) { | |
399 // Allocate an array of dummy objects. | |
400 // We'd like these to be at the bottom of the old generation, | |
401 // so that when we free one and then collect, | |
402 // (almost) the whole heap moves | |
403 // and we find out if we actually update all the oops correctly. | |
404 // But we can't allocate directly in the old generation, | |
405 // so we allocate wherever, and hope that the first collection | |
406 // moves these objects to the bottom of the old generation. | |
407 // We can allocate directly in the permanent generation, so we do. | |
408 int size; | |
409 if (UseConcMarkSweepGC) { | |
410 warning("Using +FullGCALot with concurrent mark sweep gc " | |
411 "will not force all objects to relocate"); | |
412 size = FullGCALotDummies; | |
413 } else { | |
414 size = FullGCALotDummies * 2; | |
415 } | |
416 objArrayOop naked_array = oopFactory::new_system_objArray(size, CHECK); | |
417 objArrayHandle dummy_array(THREAD, naked_array); | |
418 int i = 0; | |
419 while (i < size) { | |
420 if (!UseConcMarkSweepGC) { | |
421 // Allocate dummy in old generation | |
422 oop dummy = instanceKlass::cast(SystemDictionary::object_klass())->allocate_instance(CHECK); | |
423 dummy_array->obj_at_put(i++, dummy); | |
424 } | |
425 // Allocate dummy in permanent generation | |
426 oop dummy = instanceKlass::cast(SystemDictionary::object_klass())->allocate_permanent_instance(CHECK); | |
427 dummy_array->obj_at_put(i++, dummy); | |
428 } | |
429 { | |
430 // Only modify the global variable inside the mutex. | |
431 // If we had a race to here, the other dummy_array instances | |
432 // and their elements just get dropped on the floor, which is fine. | |
433 MutexLocker ml(FullGCALot_lock); | |
434 if (_fullgc_alot_dummy_array == NULL) { | |
435 _fullgc_alot_dummy_array = dummy_array(); | |
436 } | |
437 } | |
438 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); | |
439 } | |
440 #endif | |
441 } | |
442 | |
443 | |
444 static inline void add_vtable(void** list, int* n, Klass* o, int count) { | |
445 list[(*n)++] = *(void**)&o->vtbl_value(); | |
446 guarantee((*n) <= count, "vtable list too small."); | |
447 } | |
448 | |
449 | |
450 void Universe::init_self_patching_vtbl_list(void** list, int count) { | |
451 int n = 0; | |
452 { klassKlass o; add_vtable(list, &n, &o, count); } | |
453 { arrayKlassKlass o; add_vtable(list, &n, &o, count); } | |
454 { objArrayKlassKlass o; add_vtable(list, &n, &o, count); } | |
455 { instanceKlassKlass o; add_vtable(list, &n, &o, count); } | |
456 { instanceKlass o; add_vtable(list, &n, &o, count); } | |
457 { instanceRefKlass o; add_vtable(list, &n, &o, count); } | |
458 { typeArrayKlassKlass o; add_vtable(list, &n, &o, count); } | |
459 { symbolKlass o; add_vtable(list, &n, &o, count); } | |
460 { typeArrayKlass o; add_vtable(list, &n, &o, count); } | |
461 { methodKlass o; add_vtable(list, &n, &o, count); } | |
462 { constMethodKlass o; add_vtable(list, &n, &o, count); } | |
463 { constantPoolKlass o; add_vtable(list, &n, &o, count); } | |
464 { constantPoolCacheKlass o; add_vtable(list, &n, &o, count); } | |
465 { objArrayKlass o; add_vtable(list, &n, &o, count); } | |
466 { methodDataKlass o; add_vtable(list, &n, &o, count); } | |
467 { compiledICHolderKlass o; add_vtable(list, &n, &o, count); } | |
468 } | |
469 | |
470 | |
471 class FixupMirrorClosure: public ObjectClosure { | |
472 public: | |
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473 virtual void do_object(oop obj) { |
0 | 474 if (obj->is_klass()) { |
475 EXCEPTION_MARK; | |
476 KlassHandle k(THREAD, klassOop(obj)); | |
477 // We will never reach the CATCH below since Exceptions::_throw will cause | |
478 // the VM to exit if an exception is thrown during initialization | |
479 java_lang_Class::create_mirror(k, CATCH); | |
480 // This call unconditionally creates a new mirror for k, | |
481 // and links in k's component_mirror field if k is an array. | |
482 // If k is an objArray, k's element type must already have | |
483 // a mirror. In other words, this closure must process | |
484 // the component type of an objArray k before it processes k. | |
485 // This works because the permgen iterator presents arrays | |
486 // and their component types in order of creation. | |
487 } | |
488 } | |
489 }; | |
490 | |
491 void Universe::initialize_basic_type_mirrors(TRAPS) { | |
492 if (UseSharedSpaces) { | |
493 assert(_int_mirror != NULL, "already loaded"); | |
494 assert(_void_mirror == _mirrors[T_VOID], "consistently loaded"); | |
495 } else { | |
496 | |
497 assert(_int_mirror==NULL, "basic type mirrors already initialized"); | |
498 _int_mirror = | |
499 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); | |
500 _float_mirror = | |
501 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); | |
502 _double_mirror = | |
503 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); | |
504 _byte_mirror = | |
505 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); | |
506 _bool_mirror = | |
507 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); | |
508 _char_mirror = | |
509 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); | |
510 _long_mirror = | |
511 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); | |
512 _short_mirror = | |
513 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); | |
514 _void_mirror = | |
515 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); | |
516 | |
517 _mirrors[T_INT] = _int_mirror; | |
518 _mirrors[T_FLOAT] = _float_mirror; | |
519 _mirrors[T_DOUBLE] = _double_mirror; | |
520 _mirrors[T_BYTE] = _byte_mirror; | |
521 _mirrors[T_BOOLEAN] = _bool_mirror; | |
522 _mirrors[T_CHAR] = _char_mirror; | |
523 _mirrors[T_LONG] = _long_mirror; | |
524 _mirrors[T_SHORT] = _short_mirror; | |
525 _mirrors[T_VOID] = _void_mirror; | |
526 //_mirrors[T_OBJECT] = instanceKlass::cast(_object_klass)->java_mirror(); | |
527 //_mirrors[T_ARRAY] = instanceKlass::cast(_object_klass)->java_mirror(); | |
528 } | |
529 } | |
530 | |
531 void Universe::fixup_mirrors(TRAPS) { | |
532 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, | |
533 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply | |
534 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note | |
535 // that the number of objects allocated at this point is very small. | |
536 assert(SystemDictionary::class_klass_loaded(), "java.lang.Class should be loaded"); | |
537 FixupMirrorClosure blk; | |
538 Universe::heap()->permanent_object_iterate(&blk); | |
539 } | |
540 | |
541 | |
542 static bool has_run_finalizers_on_exit = false; | |
543 | |
544 void Universe::run_finalizers_on_exit() { | |
545 if (has_run_finalizers_on_exit) return; | |
546 has_run_finalizers_on_exit = true; | |
547 | |
548 // Called on VM exit. This ought to be run in a separate thread. | |
549 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); | |
550 { | |
551 PRESERVE_EXCEPTION_MARK; | |
552 KlassHandle finalizer_klass(THREAD, SystemDictionary::finalizer_klass()); | |
553 JavaValue result(T_VOID); | |
554 JavaCalls::call_static( | |
555 &result, | |
556 finalizer_klass, | |
557 vmSymbolHandles::run_finalizers_on_exit_name(), | |
558 vmSymbolHandles::void_method_signature(), | |
559 THREAD | |
560 ); | |
561 // Ignore any pending exceptions | |
562 CLEAR_PENDING_EXCEPTION; | |
563 } | |
564 } | |
565 | |
566 | |
567 // initialize_vtable could cause gc if | |
568 // 1) we specified true to initialize_vtable and | |
569 // 2) this ran after gc was enabled | |
570 // In case those ever change we use handles for oops | |
571 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { | |
572 // init vtable of k and all subclasses | |
573 Klass* ko = k_h()->klass_part(); | |
574 klassVtable* vt = ko->vtable(); | |
575 if (vt) vt->initialize_vtable(false, CHECK); | |
576 if (ko->oop_is_instance()) { | |
577 instanceKlass* ik = (instanceKlass*)ko; | |
578 for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->klass_part()->next_sibling())) { | |
579 reinitialize_vtable_of(s_h, CHECK); | |
580 } | |
581 } | |
582 } | |
583 | |
584 | |
585 void initialize_itable_for_klass(klassOop k, TRAPS) { | |
586 instanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); | |
587 } | |
588 | |
589 | |
590 void Universe::reinitialize_itables(TRAPS) { | |
591 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); | |
592 | |
593 } | |
594 | |
595 | |
596 bool Universe::on_page_boundary(void* addr) { | |
597 return ((uintptr_t) addr) % os::vm_page_size() == 0; | |
598 } | |
599 | |
600 | |
601 bool Universe::should_fill_in_stack_trace(Handle throwable) { | |
602 // never attempt to fill in the stack trace of preallocated errors that do not have | |
603 // backtrace. These errors are kept alive forever and may be "re-used" when all | |
604 // preallocated errors with backtrace have been consumed. Also need to avoid | |
605 // a potential loop which could happen if an out of memory occurs when attempting | |
606 // to allocate the backtrace. | |
607 return ((throwable() != Universe::_out_of_memory_error_java_heap) && | |
608 (throwable() != Universe::_out_of_memory_error_perm_gen) && | |
609 (throwable() != Universe::_out_of_memory_error_array_size) && | |
610 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); | |
611 } | |
612 | |
613 | |
614 oop Universe::gen_out_of_memory_error(oop default_err) { | |
615 // generate an out of memory error: | |
616 // - if there is a preallocated error with backtrace available then return it wth | |
617 // a filled in stack trace. | |
618 // - if there are no preallocated errors with backtrace available then return | |
619 // an error without backtrace. | |
620 int next; | |
621 if (_preallocated_out_of_memory_error_avail_count > 0) { | |
622 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); | |
623 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); | |
624 } else { | |
625 next = -1; | |
626 } | |
627 if (next < 0) { | |
628 // all preallocated errors have been used. | |
629 // return default | |
630 return default_err; | |
631 } else { | |
632 // get the error object at the slot and set set it to NULL so that the | |
633 // array isn't keeping it alive anymore. | |
634 oop exc = preallocated_out_of_memory_errors()->obj_at(next); | |
635 assert(exc != NULL, "slot has been used already"); | |
636 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); | |
637 | |
638 // use the message from the default error | |
639 oop msg = java_lang_Throwable::message(default_err); | |
640 assert(msg != NULL, "no message"); | |
641 java_lang_Throwable::set_message(exc, msg); | |
642 | |
643 // populate the stack trace and return it. | |
644 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); | |
645 return exc; | |
646 } | |
647 } | |
648 | |
649 static intptr_t non_oop_bits = 0; | |
650 | |
651 void* Universe::non_oop_word() { | |
652 // Neither the high bits nor the low bits of this value is allowed | |
653 // to look like (respectively) the high or low bits of a real oop. | |
654 // | |
655 // High and low are CPU-specific notions, but low always includes | |
656 // the low-order bit. Since oops are always aligned at least mod 4, | |
657 // setting the low-order bit will ensure that the low half of the | |
658 // word will never look like that of a real oop. | |
659 // | |
660 // Using the OS-supplied non-memory-address word (usually 0 or -1) | |
661 // will take care of the high bits, however many there are. | |
662 | |
663 if (non_oop_bits == 0) { | |
664 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; | |
665 } | |
666 | |
667 return (void*)non_oop_bits; | |
668 } | |
669 | |
670 jint universe_init() { | |
671 assert(!Universe::_fully_initialized, "called after initialize_vtables"); | |
672 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), | |
673 "LogHeapWordSize is incorrect."); | |
674 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); | |
675 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, | |
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676 "oop size is not not a multiple of HeapWord size"); |
0 | 677 TraceTime timer("Genesis", TraceStartupTime); |
678 GC_locker::lock(); // do not allow gc during bootstrapping | |
679 JavaClasses::compute_hard_coded_offsets(); | |
680 | |
681 // Get map info from shared archive file. | |
682 if (DumpSharedSpaces) | |
683 UseSharedSpaces = false; | |
684 | |
685 FileMapInfo* mapinfo = NULL; | |
686 if (UseSharedSpaces) { | |
687 mapinfo = NEW_C_HEAP_OBJ(FileMapInfo); | |
688 memset(mapinfo, 0, sizeof(FileMapInfo)); | |
689 | |
690 // Open the shared archive file, read and validate the header. If | |
691 // initialization files, shared spaces [UseSharedSpaces] are | |
692 // disabled and the file is closed. | |
693 | |
694 if (mapinfo->initialize()) { | |
695 FileMapInfo::set_current_info(mapinfo); | |
696 } else { | |
697 assert(!mapinfo->is_open() && !UseSharedSpaces, | |
698 "archive file not closed or shared spaces not disabled."); | |
699 } | |
700 } | |
701 | |
702 jint status = Universe::initialize_heap(); | |
703 if (status != JNI_OK) { | |
704 return status; | |
705 } | |
706 | |
707 // We have a heap so create the methodOop caches before | |
708 // CompactingPermGenGen::initialize_oops() tries to populate them. | |
709 Universe::_finalizer_register_cache = new LatestMethodOopCache(); | |
710 Universe::_loader_addClass_cache = new LatestMethodOopCache(); | |
711 Universe::_reflect_invoke_cache = new ActiveMethodOopsCache(); | |
712 | |
713 if (UseSharedSpaces) { | |
714 | |
715 // Read the data structures supporting the shared spaces (shared | |
716 // system dictionary, symbol table, etc.). After that, access to | |
717 // the file (other than the mapped regions) is no longer needed, and | |
718 // the file is closed. Closing the file does not affect the | |
719 // currently mapped regions. | |
720 | |
721 CompactingPermGenGen::initialize_oops(); | |
722 mapinfo->close(); | |
723 | |
724 } else { | |
725 SymbolTable::create_table(); | |
726 StringTable::create_table(); | |
727 ClassLoader::create_package_info_table(); | |
728 } | |
729 | |
730 return JNI_OK; | |
731 } | |
732 | |
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733 // Choose the heap base address and oop encoding mode |
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734 // when compressed oops are used: |
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735 // Unscaled - Use 32-bits oops without encoding when |
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736 // NarrowOopHeapBaseMin + heap_size < 4Gb |
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737 // ZeroBased - Use zero based compressed oops with encoding when |
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738 // NarrowOopHeapBaseMin + heap_size < 32Gb |
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739 // HeapBased - Use compressed oops with heap base + encoding. |
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740 |
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741 // 4Gb |
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742 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); |
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743 // 32Gb |
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744 static const uint64_t OopEncodingHeapMax = NarrowOopHeapMax << LogMinObjAlignmentInBytes; |
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745 |
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746 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) { |
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747 #ifdef _LP64 |
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748 if (UseCompressedOops) { |
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749 assert(mode == UnscaledNarrowOop || |
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750 mode == ZeroBasedNarrowOop || |
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751 mode == HeapBasedNarrowOop, "mode is invalid"); |
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752 |
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753 const size_t total_size = heap_size + HeapBaseMinAddress; |
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754 if (total_size <= OopEncodingHeapMax && (mode != HeapBasedNarrowOop)) { |
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755 if (total_size <= NarrowOopHeapMax && (mode == UnscaledNarrowOop) && |
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756 (Universe::narrow_oop_shift() == 0)) { |
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757 // Use 32-bits oops without encoding and |
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758 // place heap's top on the 4Gb boundary |
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759 return (char*)(NarrowOopHeapMax - heap_size); |
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760 } else { |
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761 // Can't reserve with NarrowOopShift == 0 |
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762 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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763 if (mode == UnscaledNarrowOop || |
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764 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { |
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765 // Use zero based compressed oops with encoding and |
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766 // place heap's top on the 32Gb boundary in case |
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767 // total_size > 4Gb or failed to reserve below 4Gb. |
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768 return (char*)(OopEncodingHeapMax - heap_size); |
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769 } |
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770 } |
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771 } else { |
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772 // Can't reserve below 32Gb. |
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773 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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774 } |
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775 } |
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776 #endif |
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777 return NULL; // also return NULL (don't care) for 32-bit VM |
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778 } |
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779 |
0 | 780 jint Universe::initialize_heap() { |
781 | |
782 if (UseParallelGC) { | |
783 #ifndef SERIALGC | |
784 Universe::_collectedHeap = new ParallelScavengeHeap(); | |
785 #else // SERIALGC | |
786 fatal("UseParallelGC not supported in java kernel vm."); | |
787 #endif // SERIALGC | |
788 | |
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789 } else if (UseG1GC) { |
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790 #ifndef SERIALGC |
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791 G1CollectorPolicy* g1p = new G1CollectorPolicy_BestRegionsFirst(); |
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792 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); |
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793 Universe::_collectedHeap = g1h; |
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794 #else // SERIALGC |
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795 fatal("UseG1GC not supported in java kernel vm."); |
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796 #endif // SERIALGC |
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797 |
0 | 798 } else { |
799 GenCollectorPolicy *gc_policy; | |
800 | |
801 if (UseSerialGC) { | |
802 gc_policy = new MarkSweepPolicy(); | |
803 } else if (UseConcMarkSweepGC) { | |
804 #ifndef SERIALGC | |
805 if (UseAdaptiveSizePolicy) { | |
806 gc_policy = new ASConcurrentMarkSweepPolicy(); | |
807 } else { | |
808 gc_policy = new ConcurrentMarkSweepPolicy(); | |
809 } | |
810 #else // SERIALGC | |
811 fatal("UseConcMarkSweepGC not supported in java kernel vm."); | |
812 #endif // SERIALGC | |
813 } else { // default old generation | |
814 gc_policy = new MarkSweepPolicy(); | |
815 } | |
816 | |
817 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); | |
818 } | |
819 | |
820 jint status = Universe::heap()->initialize(); | |
821 if (status != JNI_OK) { | |
822 return status; | |
823 } | |
642
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824 |
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825 #ifdef _LP64 |
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826 if (UseCompressedOops) { |
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827 // Subtract a page because something can get allocated at heap base. |
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828 // This also makes implicit null checking work, because the |
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829 // memory+1 page below heap_base needs to cause a signal. |
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830 // See needs_explicit_null_check. |
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831 // Only set the heap base for compressed oops because it indicates |
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832 // compressed oops for pstack code. |
642
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833 if (PrintCompressedOopsMode) { |
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834 tty->cr(); |
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835 tty->print("heap address: "PTR_FORMAT, Universe::heap()->base()); |
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836 } |
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837 if ((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax) { |
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838 // Can't reserve heap below 32Gb. |
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839 Universe::set_narrow_oop_base(Universe::heap()->base() - os::vm_page_size()); |
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840 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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841 if (PrintCompressedOopsMode) { |
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842 tty->print(", Compressed Oops with base: "PTR_FORMAT, Universe::narrow_oop_base()); |
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843 } |
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844 } else { |
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845 Universe::set_narrow_oop_base(0); |
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846 if (PrintCompressedOopsMode) { |
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847 tty->print(", zero based Compressed Oops"); |
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848 } |
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849 #ifdef _WIN64 |
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850 if (!Universe::narrow_oop_use_implicit_null_checks()) { |
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851 // Don't need guard page for implicit checks in indexed addressing |
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852 // mode with zero based Compressed Oops. |
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853 Universe::set_narrow_oop_use_implicit_null_checks(true); |
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854 } |
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855 #endif // _WIN64 |
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856 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { |
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857 // Can't reserve heap below 4Gb. |
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858 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); |
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859 } else { |
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860 assert(Universe::narrow_oop_shift() == 0, "use unscaled narrow oop"); |
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861 if (PrintCompressedOopsMode) { |
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862 tty->print(", 32-bits Oops"); |
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863 } |
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864 } |
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865 } |
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866 if (PrintCompressedOopsMode) { |
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867 tty->cr(); |
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868 tty->cr(); |
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869 } |
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870 } |
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871 assert(Universe::narrow_oop_base() == (Universe::heap()->base() - os::vm_page_size()) || |
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872 Universe::narrow_oop_base() == NULL, "invalid value"); |
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873 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || |
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874 Universe::narrow_oop_shift() == 0, "invalid value"); |
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875 #endif |
0 | 876 |
877 // We will never reach the CATCH below since Exceptions::_throw will cause | |
878 // the VM to exit if an exception is thrown during initialization | |
879 | |
880 if (UseTLAB) { | |
881 assert(Universe::heap()->supports_tlab_allocation(), | |
882 "Should support thread-local allocation buffers"); | |
883 ThreadLocalAllocBuffer::startup_initialization(); | |
884 } | |
885 return JNI_OK; | |
886 } | |
887 | |
888 // It's the caller's repsonsibility to ensure glitch-freedom | |
889 // (if required). | |
890 void Universe::update_heap_info_at_gc() { | |
891 _heap_capacity_at_last_gc = heap()->capacity(); | |
892 _heap_used_at_last_gc = heap()->used(); | |
893 } | |
894 | |
895 | |
896 | |
897 void universe2_init() { | |
898 EXCEPTION_MARK; | |
899 Universe::genesis(CATCH); | |
900 // Although we'd like to verify here that the state of the heap | |
901 // is good, we can't because the main thread has not yet added | |
902 // itself to the threads list (so, using current interfaces | |
903 // we can't "fill" its TLAB), unless TLABs are disabled. | |
904 if (VerifyBeforeGC && !UseTLAB && | |
905 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
906 Universe::heap()->prepare_for_verify(); | |
907 Universe::verify(); // make sure we're starting with a clean slate | |
908 } | |
909 } | |
910 | |
911 | |
912 // This function is defined in JVM.cpp | |
913 extern void initialize_converter_functions(); | |
914 | |
915 bool universe_post_init() { | |
916 Universe::_fully_initialized = true; | |
917 EXCEPTION_MARK; | |
918 { ResourceMark rm; | |
919 Interpreter::initialize(); // needed for interpreter entry points | |
920 if (!UseSharedSpaces) { | |
921 KlassHandle ok_h(THREAD, SystemDictionary::object_klass()); | |
922 Universe::reinitialize_vtable_of(ok_h, CHECK_false); | |
923 Universe::reinitialize_itables(CHECK_false); | |
924 } | |
925 } | |
926 | |
927 klassOop k; | |
928 instanceKlassHandle k_h; | |
929 if (!UseSharedSpaces) { | |
930 // Setup preallocated empty java.lang.Class array | |
931 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::class_klass(), 0, CHECK_false); | |
932 // Setup preallocated OutOfMemoryError errors | |
933 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_OutOfMemoryError(), true, CHECK_false); | |
934 k_h = instanceKlassHandle(THREAD, k); | |
935 Universe::_out_of_memory_error_java_heap = k_h->allocate_permanent_instance(CHECK_false); | |
936 Universe::_out_of_memory_error_perm_gen = k_h->allocate_permanent_instance(CHECK_false); | |
937 Universe::_out_of_memory_error_array_size = k_h->allocate_permanent_instance(CHECK_false); | |
938 Universe::_out_of_memory_error_gc_overhead_limit = | |
939 k_h->allocate_permanent_instance(CHECK_false); | |
940 | |
941 // Setup preallocated NullPointerException | |
942 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
943 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_NullPointerException(), true, CHECK_false); | |
944 Universe::_null_ptr_exception_instance = instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); | |
945 // Setup preallocated ArithmeticException | |
946 // (this is currently used for a cheap & dirty solution in compiler exception handling) | |
947 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_ArithmeticException(), true, CHECK_false); | |
948 Universe::_arithmetic_exception_instance = instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); | |
949 // Virtual Machine Error for when we get into a situation we can't resolve | |
950 k = SystemDictionary::resolve_or_fail( | |
951 vmSymbolHandles::java_lang_VirtualMachineError(), true, CHECK_false); | |
952 bool linked = instanceKlass::cast(k)->link_class_or_fail(CHECK_false); | |
953 if (!linked) { | |
954 tty->print_cr("Unable to link/verify VirtualMachineError class"); | |
955 return false; // initialization failed | |
956 } | |
957 Universe::_virtual_machine_error_instance = | |
958 instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); | |
959 } | |
960 if (!DumpSharedSpaces) { | |
961 // These are the only Java fields that are currently set during shared space dumping. | |
962 // We prefer to not handle this generally, so we always reinitialize these detail messages. | |
963 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); | |
964 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); | |
965 | |
966 msg = java_lang_String::create_from_str("PermGen space", CHECK_false); | |
967 java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg()); | |
968 | |
969 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); | |
970 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); | |
971 | |
972 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); | |
973 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); | |
974 | |
975 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); | |
976 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); | |
977 | |
978 // Setup the array of errors that have preallocated backtrace | |
979 k = Universe::_out_of_memory_error_java_heap->klass(); | |
980 assert(k->klass_part()->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); | |
981 k_h = instanceKlassHandle(THREAD, k); | |
982 | |
983 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; | |
984 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); | |
985 for (int i=0; i<len; i++) { | |
986 oop err = k_h->allocate_permanent_instance(CHECK_false); | |
987 Handle err_h = Handle(THREAD, err); | |
988 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); | |
989 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); | |
990 } | |
991 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; | |
992 } | |
993 | |
994 | |
995 // Setup static method for registering finalizers | |
996 // The finalizer klass must be linked before looking up the method, in | |
997 // case it needs to get rewritten. | |
998 instanceKlass::cast(SystemDictionary::finalizer_klass())->link_class(CHECK_false); | |
999 methodOop m = instanceKlass::cast(SystemDictionary::finalizer_klass())->find_method( | |
1000 vmSymbols::register_method_name(), | |
1001 vmSymbols::register_method_signature()); | |
1002 if (m == NULL || !m->is_static()) { | |
1003 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
1004 "java.lang.ref.Finalizer.register", false); | |
1005 } | |
1006 Universe::_finalizer_register_cache->init( | |
1007 SystemDictionary::finalizer_klass(), m, CHECK_false); | |
1008 | |
1009 // Resolve on first use and initialize class. | |
1010 // Note: No race-condition here, since a resolve will always return the same result | |
1011 | |
1012 // Setup method for security checks | |
1013 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_reflect_Method(), true, CHECK_false); | |
1014 k_h = instanceKlassHandle(THREAD, k); | |
1015 k_h->link_class(CHECK_false); | |
1016 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_array_object_object_signature()); | |
1017 if (m == NULL || m->is_static()) { | |
1018 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
1019 "java.lang.reflect.Method.invoke", false); | |
1020 } | |
1021 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false); | |
1022 | |
1023 // Setup method for registering loaded classes in class loader vector | |
1024 instanceKlass::cast(SystemDictionary::classloader_klass())->link_class(CHECK_false); | |
1025 m = instanceKlass::cast(SystemDictionary::classloader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); | |
1026 if (m == NULL || m->is_static()) { | |
1027 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), | |
1028 "java.lang.ClassLoader.addClass", false); | |
1029 } | |
1030 Universe::_loader_addClass_cache->init( | |
1031 SystemDictionary::classloader_klass(), m, CHECK_false); | |
1032 | |
1033 // The folowing is initializing converter functions for serialization in | |
1034 // JVM.cpp. If we clean up the StrictMath code above we may want to find | |
1035 // a better solution for this as well. | |
1036 initialize_converter_functions(); | |
1037 | |
1038 // This needs to be done before the first scavenge/gc, since | |
1039 // it's an input to soft ref clearing policy. | |
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1040 { |
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1041 MutexLocker x(Heap_lock); |
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1042 Universe::update_heap_info_at_gc(); |
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1043 } |
0 | 1044 |
1045 // ("weak") refs processing infrastructure initialization | |
1046 Universe::heap()->post_initialize(); | |
1047 | |
1048 GC_locker::unlock(); // allow gc after bootstrapping | |
1049 | |
1050 MemoryService::set_universe_heap(Universe::_collectedHeap); | |
1051 return true; | |
1052 } | |
1053 | |
1054 | |
1055 void Universe::compute_base_vtable_size() { | |
1056 _base_vtable_size = ClassLoader::compute_Object_vtable(); | |
1057 } | |
1058 | |
1059 | |
1060 // %%% The Universe::flush_foo methods belong in CodeCache. | |
1061 | |
1062 // Flushes compiled methods dependent on dependee. | |
1063 void Universe::flush_dependents_on(instanceKlassHandle dependee) { | |
1064 assert_lock_strong(Compile_lock); | |
1065 | |
1066 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
1067 | |
1068 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1069 // stopped dring the safepoint so CodeCache will be safe to update without | |
1070 // holding the CodeCache_lock. | |
1071 | |
1072 DepChange changes(dependee); | |
1073 | |
1074 // Compute the dependent nmethods | |
1075 if (CodeCache::mark_for_deoptimization(changes) > 0) { | |
1076 // At least one nmethod has been marked for deoptimization | |
1077 VM_Deoptimize op; | |
1078 VMThread::execute(&op); | |
1079 } | |
1080 } | |
1081 | |
1082 #ifdef HOTSWAP | |
1083 // Flushes compiled methods dependent on dependee in the evolutionary sense | |
1084 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { | |
1085 // --- Compile_lock is not held. However we are at a safepoint. | |
1086 assert_locked_or_safepoint(Compile_lock); | |
1087 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; | |
1088 | |
1089 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1090 // stopped dring the safepoint so CodeCache will be safe to update without | |
1091 // holding the CodeCache_lock. | |
1092 | |
1093 // Compute the dependent nmethods | |
1094 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { | |
1095 // At least one nmethod has been marked for deoptimization | |
1096 | |
1097 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
1098 // Stuff copied from VM_Deoptimize and modified slightly. | |
1099 | |
1100 // We do not want any GCs to happen while we are in the middle of this VM operation | |
1101 ResourceMark rm; | |
1102 DeoptimizationMarker dm; | |
1103 | |
1104 // Deoptimize all activations depending on marked nmethods | |
1105 Deoptimization::deoptimize_dependents(); | |
1106 | |
1107 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
1108 CodeCache::make_marked_nmethods_not_entrant(); | |
1109 } | |
1110 } | |
1111 #endif // HOTSWAP | |
1112 | |
1113 | |
1114 // Flushes compiled methods dependent on dependee | |
1115 void Universe::flush_dependents_on_method(methodHandle m_h) { | |
1116 // --- Compile_lock is not held. However we are at a safepoint. | |
1117 assert_locked_or_safepoint(Compile_lock); | |
1118 | |
1119 // CodeCache can only be updated by a thread_in_VM and they will all be | |
1120 // stopped dring the safepoint so CodeCache will be safe to update without | |
1121 // holding the CodeCache_lock. | |
1122 | |
1123 // Compute the dependent nmethods | |
1124 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { | |
1125 // At least one nmethod has been marked for deoptimization | |
1126 | |
1127 // All this already happens inside a VM_Operation, so we'll do all the work here. | |
1128 // Stuff copied from VM_Deoptimize and modified slightly. | |
1129 | |
1130 // We do not want any GCs to happen while we are in the middle of this VM operation | |
1131 ResourceMark rm; | |
1132 DeoptimizationMarker dm; | |
1133 | |
1134 // Deoptimize all activations depending on marked nmethods | |
1135 Deoptimization::deoptimize_dependents(); | |
1136 | |
1137 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) | |
1138 CodeCache::make_marked_nmethods_not_entrant(); | |
1139 } | |
1140 } | |
1141 | |
1142 void Universe::print() { print_on(gclog_or_tty); } | |
1143 | |
1144 void Universe::print_on(outputStream* st) { | |
1145 st->print_cr("Heap"); | |
1146 heap()->print_on(st); | |
1147 } | |
1148 | |
1149 void Universe::print_heap_at_SIGBREAK() { | |
1150 if (PrintHeapAtSIGBREAK) { | |
1151 MutexLocker hl(Heap_lock); | |
1152 print_on(tty); | |
1153 tty->cr(); | |
1154 tty->flush(); | |
1155 } | |
1156 } | |
1157 | |
1158 void Universe::print_heap_before_gc(outputStream* st) { | |
1159 st->print_cr("{Heap before GC invocations=%u (full %u):", | |
1160 heap()->total_collections(), | |
1161 heap()->total_full_collections()); | |
1162 heap()->print_on(st); | |
1163 } | |
1164 | |
1165 void Universe::print_heap_after_gc(outputStream* st) { | |
1166 st->print_cr("Heap after GC invocations=%u (full %u):", | |
1167 heap()->total_collections(), | |
1168 heap()->total_full_collections()); | |
1169 heap()->print_on(st); | |
1170 st->print_cr("}"); | |
1171 } | |
1172 | |
1173 void Universe::verify(bool allow_dirty, bool silent) { | |
1174 if (SharedSkipVerify) { | |
1175 return; | |
1176 } | |
1177 | |
1178 // The use of _verify_in_progress is a temporary work around for | |
1179 // 6320749. Don't bother with a creating a class to set and clear | |
1180 // it since it is only used in this method and the control flow is | |
1181 // straight forward. | |
1182 _verify_in_progress = true; | |
1183 | |
1184 COMPILER2_PRESENT( | |
1185 assert(!DerivedPointerTable::is_active(), | |
1186 "DPT should not be active during verification " | |
1187 "(of thread stacks below)"); | |
1188 ) | |
1189 | |
1190 ResourceMark rm; | |
1191 HandleMark hm; // Handles created during verification can be zapped | |
1192 _verify_count++; | |
1193 | |
1194 if (!silent) gclog_or_tty->print("[Verifying "); | |
1195 if (!silent) gclog_or_tty->print("threads "); | |
1196 Threads::verify(); | |
1197 heap()->verify(allow_dirty, silent); | |
1198 | |
1199 if (!silent) gclog_or_tty->print("syms "); | |
1200 SymbolTable::verify(); | |
1201 if (!silent) gclog_or_tty->print("strs "); | |
1202 StringTable::verify(); | |
1203 { | |
1204 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
1205 if (!silent) gclog_or_tty->print("zone "); | |
1206 CodeCache::verify(); | |
1207 } | |
1208 if (!silent) gclog_or_tty->print("dict "); | |
1209 SystemDictionary::verify(); | |
1210 if (!silent) gclog_or_tty->print("hand "); | |
1211 JNIHandles::verify(); | |
1212 if (!silent) gclog_or_tty->print("C-heap "); | |
1213 os::check_heap(); | |
1214 if (!silent) gclog_or_tty->print_cr("]"); | |
1215 | |
1216 _verify_in_progress = false; | |
1217 } | |
1218 | |
1219 // Oop verification (see MacroAssembler::verify_oop) | |
1220 | |
1221 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; | |
1222 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; | |
1223 | |
1224 | |
1225 static void calculate_verify_data(uintptr_t verify_data[2], | |
1226 HeapWord* low_boundary, | |
1227 HeapWord* high_boundary) { | |
1228 assert(low_boundary < high_boundary, "bad interval"); | |
1229 | |
1230 // decide which low-order bits we require to be clear: | |
1231 size_t alignSize = MinObjAlignmentInBytes; | |
1232 size_t min_object_size = oopDesc::header_size(); | |
1233 | |
1234 // make an inclusive limit: | |
1235 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; | |
1236 uintptr_t min = (uintptr_t)low_boundary; | |
1237 assert(min < max, "bad interval"); | |
1238 uintptr_t diff = max ^ min; | |
1239 | |
1240 // throw away enough low-order bits to make the diff vanish | |
1241 uintptr_t mask = (uintptr_t)(-1); | |
1242 while ((mask & diff) != 0) | |
1243 mask <<= 1; | |
1244 uintptr_t bits = (min & mask); | |
1245 assert(bits == (max & mask), "correct mask"); | |
1246 // check an intermediate value between min and max, just to make sure: | |
1247 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); | |
1248 | |
1249 // require address alignment, too: | |
1250 mask |= (alignSize - 1); | |
1251 | |
1252 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { | |
1253 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); | |
1254 } | |
1255 verify_data[0] = mask; | |
1256 verify_data[1] = bits; | |
1257 } | |
1258 | |
1259 | |
1260 // Oop verification (see MacroAssembler::verify_oop) | |
1261 #ifndef PRODUCT | |
1262 | |
1263 uintptr_t Universe::verify_oop_mask() { | |
1264 MemRegion m = heap()->reserved_region(); | |
1265 calculate_verify_data(_verify_oop_data, | |
1266 m.start(), | |
1267 m.end()); | |
1268 return _verify_oop_data[0]; | |
1269 } | |
1270 | |
1271 | |
1272 | |
1273 uintptr_t Universe::verify_oop_bits() { | |
1274 verify_oop_mask(); | |
1275 return _verify_oop_data[1]; | |
1276 } | |
1277 | |
1278 | |
1279 uintptr_t Universe::verify_klass_mask() { | |
1280 /* $$$ | |
1281 // A klass can never live in the new space. Since the new and old | |
1282 // spaces can change size, we must settle for bounds-checking against | |
1283 // the bottom of the world, plus the smallest possible new and old | |
1284 // space sizes that may arise during execution. | |
1285 size_t min_new_size = Universe::new_size(); // in bytes | |
1286 size_t min_old_size = Universe::old_size(); // in bytes | |
1287 calculate_verify_data(_verify_klass_data, | |
1288 (HeapWord*)((uintptr_t)_new_gen->low_boundary + min_new_size + min_old_size), | |
1289 _perm_gen->high_boundary); | |
1290 */ | |
1291 // Why doesn't the above just say that klass's always live in the perm | |
1292 // gen? I'll see if that seems to work... | |
1293 MemRegion permanent_reserved; | |
1294 switch (Universe::heap()->kind()) { | |
1295 default: | |
1296 // ???: What if a CollectedHeap doesn't have a permanent generation? | |
1297 ShouldNotReachHere(); | |
1298 break; | |
342
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1299 case CollectedHeap::GenCollectedHeap: |
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1300 case CollectedHeap::G1CollectedHeap: { |
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1301 SharedHeap* sh = (SharedHeap*) Universe::heap(); |
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1302 permanent_reserved = sh->perm_gen()->reserved(); |
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1303 break; |
0 | 1304 } |
1305 #ifndef SERIALGC | |
1306 case CollectedHeap::ParallelScavengeHeap: { | |
1307 ParallelScavengeHeap* psh = (ParallelScavengeHeap*) Universe::heap(); | |
1308 permanent_reserved = psh->perm_gen()->reserved(); | |
1309 break; | |
1310 } | |
1311 #endif // SERIALGC | |
1312 } | |
1313 calculate_verify_data(_verify_klass_data, | |
1314 permanent_reserved.start(), | |
1315 permanent_reserved.end()); | |
1316 | |
1317 return _verify_klass_data[0]; | |
1318 } | |
1319 | |
1320 | |
1321 | |
1322 uintptr_t Universe::verify_klass_bits() { | |
1323 verify_klass_mask(); | |
1324 return _verify_klass_data[1]; | |
1325 } | |
1326 | |
1327 | |
1328 uintptr_t Universe::verify_mark_mask() { | |
1329 return markOopDesc::lock_mask_in_place; | |
1330 } | |
1331 | |
1332 | |
1333 | |
1334 uintptr_t Universe::verify_mark_bits() { | |
1335 intptr_t mask = verify_mark_mask(); | |
1336 intptr_t bits = (intptr_t)markOopDesc::prototype(); | |
1337 assert((bits & ~mask) == 0, "no stray header bits"); | |
1338 return bits; | |
1339 } | |
1340 #endif // PRODUCT | |
1341 | |
1342 | |
1343 void Universe::compute_verify_oop_data() { | |
1344 verify_oop_mask(); | |
1345 verify_oop_bits(); | |
1346 verify_mark_mask(); | |
1347 verify_mark_bits(); | |
1348 verify_klass_mask(); | |
1349 verify_klass_bits(); | |
1350 } | |
1351 | |
1352 | |
1353 void CommonMethodOopCache::init(klassOop k, methodOop m, TRAPS) { | |
1354 if (!UseSharedSpaces) { | |
1355 _klass = k; | |
1356 } | |
1357 #ifndef PRODUCT | |
1358 else { | |
1359 // sharing initilization should have already set up _klass | |
1360 assert(_klass != NULL, "just checking"); | |
1361 } | |
1362 #endif | |
1363 | |
1364 _method_idnum = m->method_idnum(); | |
1365 assert(_method_idnum >= 0, "sanity check"); | |
1366 } | |
1367 | |
1368 | |
1369 ActiveMethodOopsCache::~ActiveMethodOopsCache() { | |
1370 if (_prev_methods != NULL) { | |
1371 for (int i = _prev_methods->length() - 1; i >= 0; i--) { | |
1372 jweak method_ref = _prev_methods->at(i); | |
1373 if (method_ref != NULL) { | |
1374 JNIHandles::destroy_weak_global(method_ref); | |
1375 } | |
1376 } | |
1377 delete _prev_methods; | |
1378 _prev_methods = NULL; | |
1379 } | |
1380 } | |
1381 | |
1382 | |
1383 void ActiveMethodOopsCache::add_previous_version(const methodOop method) { | |
1384 assert(Thread::current()->is_VM_thread(), | |
1385 "only VMThread can add previous versions"); | |
1386 | |
1387 if (_prev_methods == NULL) { | |
1388 // This is the first previous version so make some space. | |
1389 // Start with 2 elements under the assumption that the class | |
1390 // won't be redefined much. | |
1391 _prev_methods = new (ResourceObj::C_HEAP) GrowableArray<jweak>(2, true); | |
1392 } | |
1393 | |
1394 // RC_TRACE macro has an embedded ResourceMark | |
1395 RC_TRACE(0x00000100, | |
1396 ("add: %s(%s): adding prev version ref for cached method @%d", | |
1397 method->name()->as_C_string(), method->signature()->as_C_string(), | |
1398 _prev_methods->length())); | |
1399 | |
1400 methodHandle method_h(method); | |
1401 jweak method_ref = JNIHandles::make_weak_global(method_h); | |
1402 _prev_methods->append(method_ref); | |
1403 | |
1404 // Using weak references allows previous versions of the cached | |
1405 // method to be GC'ed when they are no longer needed. Since the | |
1406 // caller is the VMThread and we are at a safepoint, this is a good | |
1407 // time to clear out unused weak references. | |
1408 | |
1409 for (int i = _prev_methods->length() - 1; i >= 0; i--) { | |
1410 jweak method_ref = _prev_methods->at(i); | |
1411 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); | |
1412 if (method_ref == NULL) { | |
1413 _prev_methods->remove_at(i); | |
1414 // Since we are traversing the array backwards, we don't have to | |
1415 // do anything special with the index. | |
1416 continue; // robustness | |
1417 } | |
1418 | |
1419 methodOop m = (methodOop)JNIHandles::resolve(method_ref); | |
1420 if (m == NULL) { | |
1421 // this method entry has been GC'ed so remove it | |
1422 JNIHandles::destroy_weak_global(method_ref); | |
1423 _prev_methods->remove_at(i); | |
1424 } else { | |
1425 // RC_TRACE macro has an embedded ResourceMark | |
1426 RC_TRACE(0x00000400, ("add: %s(%s): previous cached method @%d is alive", | |
1427 m->name()->as_C_string(), m->signature()->as_C_string(), i)); | |
1428 } | |
1429 } | |
1430 } // end add_previous_version() | |
1431 | |
1432 | |
1433 bool ActiveMethodOopsCache::is_same_method(const methodOop method) const { | |
1434 instanceKlass* ik = instanceKlass::cast(klass()); | |
1435 methodOop check_method = ik->method_with_idnum(method_idnum()); | |
1436 assert(check_method != NULL, "sanity check"); | |
1437 if (check_method == method) { | |
1438 // done with the easy case | |
1439 return true; | |
1440 } | |
1441 | |
1442 if (_prev_methods != NULL) { | |
1443 // The cached method has been redefined at least once so search | |
1444 // the previous versions for a match. | |
1445 for (int i = 0; i < _prev_methods->length(); i++) { | |
1446 jweak method_ref = _prev_methods->at(i); | |
1447 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); | |
1448 if (method_ref == NULL) { | |
1449 continue; // robustness | |
1450 } | |
1451 | |
1452 check_method = (methodOop)JNIHandles::resolve(method_ref); | |
1453 if (check_method == method) { | |
1454 // a previous version matches | |
1455 return true; | |
1456 } | |
1457 } | |
1458 } | |
1459 | |
1460 // either no previous versions or no previous version matched | |
1461 return false; | |
1462 } | |
1463 | |
1464 | |
1465 methodOop LatestMethodOopCache::get_methodOop() { | |
1466 instanceKlass* ik = instanceKlass::cast(klass()); | |
1467 methodOop m = ik->method_with_idnum(method_idnum()); | |
1468 assert(m != NULL, "sanity check"); | |
1469 return m; | |
1470 } | |
1471 | |
1472 | |
1473 #ifdef ASSERT | |
1474 // Release dummy object(s) at bottom of heap | |
1475 bool Universe::release_fullgc_alot_dummy() { | |
1476 MutexLocker ml(FullGCALot_lock); | |
1477 if (_fullgc_alot_dummy_array != NULL) { | |
1478 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { | |
1479 // No more dummies to release, release entire array instead | |
1480 _fullgc_alot_dummy_array = NULL; | |
1481 return false; | |
1482 } | |
1483 if (!UseConcMarkSweepGC) { | |
1484 // Release dummy at bottom of old generation | |
1485 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
1486 } | |
1487 // Release dummy at bottom of permanent generation | |
1488 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); | |
1489 } | |
1490 return true; | |
1491 } | |
1492 | |
1493 #endif // ASSERT |