Mercurial > hg > truffle
annotate src/share/vm/oops/instanceKlass.cpp @ 4724:0841c0ec2ed6
7123810: new hotspot build - hs23-b10
Reviewed-by: jcoomes
author | amurillo |
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date | Fri, 23 Dec 2011 15:29:34 -0800 |
parents | 436b4a3231bf |
children | 04b9a2566eec 52b5d32fbfaf |
rev | line source |
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0 | 1 /* |
2227 | 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/javaClasses.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/verifier.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "compiler/compileBroker.hpp" | |
31 #include "gc_implementation/shared/markSweep.inline.hpp" | |
32 #include "gc_interface/collectedHeap.inline.hpp" | |
33 #include "interpreter/oopMapCache.hpp" | |
34 #include "interpreter/rewriter.hpp" | |
35 #include "jvmtifiles/jvmti.h" | |
36 #include "memory/genOopClosures.inline.hpp" | |
37 #include "memory/oopFactory.hpp" | |
38 #include "memory/permGen.hpp" | |
3938 | 39 #include "oops/fieldStreams.hpp" |
1972 | 40 #include "oops/instanceKlass.hpp" |
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41 #include "oops/instanceMirrorKlass.hpp" |
1972 | 42 #include "oops/instanceOop.hpp" |
43 #include "oops/methodOop.hpp" | |
44 #include "oops/objArrayKlassKlass.hpp" | |
45 #include "oops/oop.inline.hpp" | |
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46 #include "oops/symbol.hpp" |
1972 | 47 #include "prims/jvmtiExport.hpp" |
48 #include "prims/jvmtiRedefineClassesTrace.hpp" | |
49 #include "runtime/fieldDescriptor.hpp" | |
50 #include "runtime/handles.inline.hpp" | |
51 #include "runtime/javaCalls.hpp" | |
52 #include "runtime/mutexLocker.hpp" | |
53 #include "services/threadService.hpp" | |
54 #include "utilities/dtrace.hpp" | |
55 #ifdef TARGET_OS_FAMILY_linux | |
56 # include "thread_linux.inline.hpp" | |
57 #endif | |
58 #ifdef TARGET_OS_FAMILY_solaris | |
59 # include "thread_solaris.inline.hpp" | |
60 #endif | |
61 #ifdef TARGET_OS_FAMILY_windows | |
62 # include "thread_windows.inline.hpp" | |
63 #endif | |
3960 | 64 #ifdef TARGET_OS_FAMILY_bsd |
65 # include "thread_bsd.inline.hpp" | |
66 #endif | |
1972 | 67 #ifndef SERIALGC |
68 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
69 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
70 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
71 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
72 #include "gc_implementation/parNew/parOopClosures.inline.hpp" | |
73 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" | |
74 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" | |
75 #include "oops/oop.pcgc.inline.hpp" | |
76 #endif | |
77 #ifdef COMPILER1 | |
78 #include "c1/c1_Compiler.hpp" | |
79 #endif | |
0 | 80 |
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81 #ifdef DTRACE_ENABLED |
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82 |
4006 | 83 #ifndef USDT2 |
84 | |
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85 HS_DTRACE_PROBE_DECL4(hotspot, class__initialization__required, |
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86 char*, intptr_t, oop, intptr_t); |
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87 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__recursive, |
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88 char*, intptr_t, oop, intptr_t, int); |
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89 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__concurrent, |
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90 char*, intptr_t, oop, intptr_t, int); |
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91 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__erroneous, |
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92 char*, intptr_t, oop, intptr_t, int); |
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93 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__super__failed, |
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94 char*, intptr_t, oop, intptr_t, int); |
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95 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__clinit, |
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96 char*, intptr_t, oop, intptr_t, int); |
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97 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__error, |
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98 char*, intptr_t, oop, intptr_t, int); |
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99 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__end, |
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100 char*, intptr_t, oop, intptr_t, int); |
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101 |
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102 #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type) \ |
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103 { \ |
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104 char* data = NULL; \ |
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105 int len = 0; \ |
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106 Symbol* name = (clss)->name(); \ |
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107 if (name != NULL) { \ |
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108 data = (char*)name->bytes(); \ |
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109 len = name->utf8_length(); \ |
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110 } \ |
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111 HS_DTRACE_PROBE4(hotspot, class__initialization__##type, \ |
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112 data, len, (clss)->class_loader(), thread_type); \ |
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113 } |
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114 |
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115 #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait) \ |
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116 { \ |
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117 char* data = NULL; \ |
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118 int len = 0; \ |
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119 Symbol* name = (clss)->name(); \ |
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120 if (name != NULL) { \ |
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121 data = (char*)name->bytes(); \ |
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122 len = name->utf8_length(); \ |
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123 } \ |
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124 HS_DTRACE_PROBE5(hotspot, class__initialization__##type, \ |
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125 data, len, (clss)->class_loader(), thread_type, wait); \ |
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126 } |
4006 | 127 #else /* USDT2 */ |
128 | |
129 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED | |
130 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE | |
131 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT | |
132 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS | |
133 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED | |
134 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT | |
135 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR | |
136 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END | |
137 #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type) \ | |
138 { \ | |
139 char* data = NULL; \ | |
140 int len = 0; \ | |
141 Symbol* name = (clss)->name(); \ | |
142 if (name != NULL) { \ | |
143 data = (char*)name->bytes(); \ | |
144 len = name->utf8_length(); \ | |
145 } \ | |
146 HOTSPOT_CLASS_INITIALIZATION_##type( \ | |
147 data, len, (clss)->class_loader(), thread_type); \ | |
148 } | |
149 | |
150 #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait) \ | |
151 { \ | |
152 char* data = NULL; \ | |
153 int len = 0; \ | |
154 Symbol* name = (clss)->name(); \ | |
155 if (name != NULL) { \ | |
156 data = (char*)name->bytes(); \ | |
157 len = name->utf8_length(); \ | |
158 } \ | |
159 HOTSPOT_CLASS_INITIALIZATION_##type( \ | |
160 data, len, (clss)->class_loader(), thread_type, wait); \ | |
161 } | |
162 #endif /* USDT2 */ | |
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163 |
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164 #else // ndef DTRACE_ENABLED |
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165 |
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166 #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type) |
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167 #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait) |
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168 |
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169 #endif // ndef DTRACE_ENABLED |
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170 |
0 | 171 bool instanceKlass::should_be_initialized() const { |
172 return !is_initialized(); | |
173 } | |
174 | |
175 klassVtable* instanceKlass::vtable() const { | |
176 return new klassVtable(as_klassOop(), start_of_vtable(), vtable_length() / vtableEntry::size()); | |
177 } | |
178 | |
179 klassItable* instanceKlass::itable() const { | |
180 return new klassItable(as_klassOop()); | |
181 } | |
182 | |
183 void instanceKlass::eager_initialize(Thread *thread) { | |
184 if (!EagerInitialization) return; | |
185 | |
186 if (this->is_not_initialized()) { | |
187 // abort if the the class has a class initializer | |
188 if (this->class_initializer() != NULL) return; | |
189 | |
190 // abort if it is java.lang.Object (initialization is handled in genesis) | |
191 klassOop super = this->super(); | |
192 if (super == NULL) return; | |
193 | |
194 // abort if the super class should be initialized | |
195 if (!instanceKlass::cast(super)->is_initialized()) return; | |
196 | |
197 // call body to expose the this pointer | |
198 instanceKlassHandle this_oop(thread, this->as_klassOop()); | |
199 eager_initialize_impl(this_oop); | |
200 } | |
201 } | |
202 | |
203 | |
204 void instanceKlass::eager_initialize_impl(instanceKlassHandle this_oop) { | |
205 EXCEPTION_MARK; | |
206 ObjectLocker ol(this_oop, THREAD); | |
207 | |
208 // abort if someone beat us to the initialization | |
209 if (!this_oop->is_not_initialized()) return; // note: not equivalent to is_initialized() | |
210 | |
211 ClassState old_state = this_oop->_init_state; | |
212 link_class_impl(this_oop, true, THREAD); | |
213 if (HAS_PENDING_EXCEPTION) { | |
214 CLEAR_PENDING_EXCEPTION; | |
215 // Abort if linking the class throws an exception. | |
216 | |
217 // Use a test to avoid redundantly resetting the state if there's | |
218 // no change. Set_init_state() asserts that state changes make | |
219 // progress, whereas here we might just be spinning in place. | |
220 if( old_state != this_oop->_init_state ) | |
221 this_oop->set_init_state (old_state); | |
222 } else { | |
223 // linking successfull, mark class as initialized | |
224 this_oop->set_init_state (fully_initialized); | |
225 // trace | |
226 if (TraceClassInitialization) { | |
227 ResourceMark rm(THREAD); | |
228 tty->print_cr("[Initialized %s without side effects]", this_oop->external_name()); | |
229 } | |
230 } | |
231 } | |
232 | |
233 | |
234 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization | |
235 // process. The step comments refers to the procedure described in that section. | |
236 // Note: implementation moved to static method to expose the this pointer. | |
237 void instanceKlass::initialize(TRAPS) { | |
238 if (this->should_be_initialized()) { | |
239 HandleMark hm(THREAD); | |
240 instanceKlassHandle this_oop(THREAD, this->as_klassOop()); | |
241 initialize_impl(this_oop, CHECK); | |
242 // Note: at this point the class may be initialized | |
243 // OR it may be in the state of being initialized | |
244 // in case of recursive initialization! | |
245 } else { | |
246 assert(is_initialized(), "sanity check"); | |
247 } | |
248 } | |
249 | |
250 | |
251 bool instanceKlass::verify_code( | |
252 instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS) { | |
253 // 1) Verify the bytecodes | |
254 Verifier::Mode mode = | |
255 throw_verifyerror ? Verifier::ThrowException : Verifier::NoException; | |
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256 return Verifier::verify(this_oop, mode, this_oop->should_verify_class(), CHECK_false); |
0 | 257 } |
258 | |
259 | |
260 // Used exclusively by the shared spaces dump mechanism to prevent | |
261 // classes mapped into the shared regions in new VMs from appearing linked. | |
262 | |
263 void instanceKlass::unlink_class() { | |
264 assert(is_linked(), "must be linked"); | |
265 _init_state = loaded; | |
266 } | |
267 | |
268 void instanceKlass::link_class(TRAPS) { | |
269 assert(is_loaded(), "must be loaded"); | |
270 if (!is_linked()) { | |
271 instanceKlassHandle this_oop(THREAD, this->as_klassOop()); | |
272 link_class_impl(this_oop, true, CHECK); | |
273 } | |
274 } | |
275 | |
276 // Called to verify that a class can link during initialization, without | |
277 // throwing a VerifyError. | |
278 bool instanceKlass::link_class_or_fail(TRAPS) { | |
279 assert(is_loaded(), "must be loaded"); | |
280 if (!is_linked()) { | |
281 instanceKlassHandle this_oop(THREAD, this->as_klassOop()); | |
282 link_class_impl(this_oop, false, CHECK_false); | |
283 } | |
284 return is_linked(); | |
285 } | |
286 | |
287 bool instanceKlass::link_class_impl( | |
288 instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS) { | |
289 // check for error state | |
290 if (this_oop->is_in_error_state()) { | |
291 ResourceMark rm(THREAD); | |
292 THROW_MSG_(vmSymbols::java_lang_NoClassDefFoundError(), | |
293 this_oop->external_name(), false); | |
294 } | |
295 // return if already verified | |
296 if (this_oop->is_linked()) { | |
297 return true; | |
298 } | |
299 | |
300 // Timing | |
301 // timer handles recursion | |
302 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl"); | |
303 JavaThread* jt = (JavaThread*)THREAD; | |
304 | |
305 // link super class before linking this class | |
306 instanceKlassHandle super(THREAD, this_oop->super()); | |
307 if (super.not_null()) { | |
308 if (super->is_interface()) { // check if super class is an interface | |
309 ResourceMark rm(THREAD); | |
310 Exceptions::fthrow( | |
311 THREAD_AND_LOCATION, | |
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312 vmSymbols::java_lang_IncompatibleClassChangeError(), |
0 | 313 "class %s has interface %s as super class", |
314 this_oop->external_name(), | |
315 super->external_name() | |
316 ); | |
317 return false; | |
318 } | |
319 | |
320 link_class_impl(super, throw_verifyerror, CHECK_false); | |
321 } | |
322 | |
323 // link all interfaces implemented by this class before linking this class | |
324 objArrayHandle interfaces (THREAD, this_oop->local_interfaces()); | |
325 int num_interfaces = interfaces->length(); | |
326 for (int index = 0; index < num_interfaces; index++) { | |
327 HandleMark hm(THREAD); | |
328 instanceKlassHandle ih(THREAD, klassOop(interfaces->obj_at(index))); | |
329 link_class_impl(ih, throw_verifyerror, CHECK_false); | |
330 } | |
331 | |
332 // in case the class is linked in the process of linking its superclasses | |
333 if (this_oop->is_linked()) { | |
334 return true; | |
335 } | |
336 | |
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337 // trace only the link time for this klass that includes |
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338 // the verification time |
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339 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(), |
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340 ClassLoader::perf_class_link_selftime(), |
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341 ClassLoader::perf_classes_linked(), |
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342 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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343 jt->get_thread_stat()->perf_timers_addr(), |
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344 PerfClassTraceTime::CLASS_LINK); |
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345 |
0 | 346 // verification & rewriting |
347 { | |
348 ObjectLocker ol(this_oop, THREAD); | |
349 // rewritten will have been set if loader constraint error found | |
350 // on an earlier link attempt | |
351 // don't verify or rewrite if already rewritten | |
352 if (!this_oop->is_linked()) { | |
353 if (!this_oop->is_rewritten()) { | |
354 { | |
355 // Timer includes any side effects of class verification (resolution, | |
356 // etc), but not recursive entry into verify_code(). | |
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357 PerfClassTraceTime timer(ClassLoader::perf_class_verify_time(), |
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358 ClassLoader::perf_class_verify_selftime(), |
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359 ClassLoader::perf_classes_verified(), |
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360 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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361 jt->get_thread_stat()->perf_timers_addr(), |
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362 PerfClassTraceTime::CLASS_VERIFY); |
0 | 363 bool verify_ok = verify_code(this_oop, throw_verifyerror, THREAD); |
364 if (!verify_ok) { | |
365 return false; | |
366 } | |
367 } | |
368 | |
369 // Just in case a side-effect of verify linked this class already | |
370 // (which can sometimes happen since the verifier loads classes | |
371 // using custom class loaders, which are free to initialize things) | |
372 if (this_oop->is_linked()) { | |
373 return true; | |
374 } | |
375 | |
376 // also sets rewritten | |
377 this_oop->rewrite_class(CHECK_false); | |
378 } | |
379 | |
3748 | 380 // relocate jsrs and link methods after they are all rewritten |
381 this_oop->relocate_and_link_methods(CHECK_false); | |
382 | |
0 | 383 // Initialize the vtable and interface table after |
384 // methods have been rewritten since rewrite may | |
385 // fabricate new methodOops. | |
386 // also does loader constraint checking | |
387 if (!this_oop()->is_shared()) { | |
388 ResourceMark rm(THREAD); | |
389 this_oop->vtable()->initialize_vtable(true, CHECK_false); | |
390 this_oop->itable()->initialize_itable(true, CHECK_false); | |
391 } | |
392 #ifdef ASSERT | |
393 else { | |
394 ResourceMark rm(THREAD); | |
395 this_oop->vtable()->verify(tty, true); | |
396 // In case itable verification is ever added. | |
397 // this_oop->itable()->verify(tty, true); | |
398 } | |
399 #endif | |
400 this_oop->set_init_state(linked); | |
401 if (JvmtiExport::should_post_class_prepare()) { | |
402 Thread *thread = THREAD; | |
403 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
404 JvmtiExport::post_class_prepare((JavaThread *) thread, this_oop()); | |
405 } | |
406 } | |
407 } | |
408 return true; | |
409 } | |
410 | |
411 | |
412 // Rewrite the byte codes of all of the methods of a class. | |
413 // The rewriter must be called exactly once. Rewriting must happen after | |
414 // verification but before the first method of the class is executed. | |
415 void instanceKlass::rewrite_class(TRAPS) { | |
416 assert(is_loaded(), "must be loaded"); | |
417 instanceKlassHandle this_oop(THREAD, this->as_klassOop()); | |
418 if (this_oop->is_rewritten()) { | |
419 assert(this_oop()->is_shared(), "rewriting an unshared class?"); | |
420 return; | |
421 } | |
3748 | 422 Rewriter::rewrite(this_oop, CHECK); |
0 | 423 this_oop->set_rewritten(); |
424 } | |
425 | |
3748 | 426 // Now relocate and link method entry points after class is rewritten. |
427 // This is outside is_rewritten flag. In case of an exception, it can be | |
428 // executed more than once. | |
429 void instanceKlass::relocate_and_link_methods(TRAPS) { | |
430 assert(is_loaded(), "must be loaded"); | |
431 instanceKlassHandle this_oop(THREAD, this->as_klassOop()); | |
432 Rewriter::relocate_and_link(this_oop, CHECK); | |
433 } | |
434 | |
0 | 435 |
436 void instanceKlass::initialize_impl(instanceKlassHandle this_oop, TRAPS) { | |
437 // Make sure klass is linked (verified) before initialization | |
438 // A class could already be verified, since it has been reflected upon. | |
439 this_oop->link_class(CHECK); | |
440 | |
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441 DTRACE_CLASSINIT_PROBE(required, instanceKlass::cast(this_oop()), -1); |
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442 |
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443 bool wait = false; |
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444 |
0 | 445 // refer to the JVM book page 47 for description of steps |
446 // Step 1 | |
447 { ObjectLocker ol(this_oop, THREAD); | |
448 | |
449 Thread *self = THREAD; // it's passed the current thread | |
450 | |
451 // Step 2 | |
452 // If we were to use wait() instead of waitInterruptibly() then | |
453 // we might end up throwing IE from link/symbol resolution sites | |
454 // that aren't expected to throw. This would wreak havoc. See 6320309. | |
455 while(this_oop->is_being_initialized() && !this_oop->is_reentrant_initialization(self)) { | |
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456 wait = true; |
0 | 457 ol.waitUninterruptibly(CHECK); |
458 } | |
459 | |
460 // Step 3 | |
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461 if (this_oop->is_being_initialized() && this_oop->is_reentrant_initialization(self)) { |
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462 DTRACE_CLASSINIT_PROBE_WAIT(recursive, instanceKlass::cast(this_oop()), -1,wait); |
0 | 463 return; |
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464 } |
0 | 465 |
466 // Step 4 | |
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467 if (this_oop->is_initialized()) { |
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468 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, instanceKlass::cast(this_oop()), -1,wait); |
0 | 469 return; |
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470 } |
0 | 471 |
472 // Step 5 | |
473 if (this_oop->is_in_error_state()) { | |
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474 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, instanceKlass::cast(this_oop()), -1,wait); |
0 | 475 ResourceMark rm(THREAD); |
476 const char* desc = "Could not initialize class "; | |
477 const char* className = this_oop->external_name(); | |
478 size_t msglen = strlen(desc) + strlen(className) + 1; | |
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479 char* message = NEW_RESOURCE_ARRAY(char, msglen); |
0 | 480 if (NULL == message) { |
481 // Out of memory: can't create detailed error message | |
482 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className); | |
483 } else { | |
484 jio_snprintf(message, msglen, "%s%s", desc, className); | |
485 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message); | |
486 } | |
487 } | |
488 | |
489 // Step 6 | |
490 this_oop->set_init_state(being_initialized); | |
491 this_oop->set_init_thread(self); | |
492 } | |
493 | |
494 // Step 7 | |
495 klassOop super_klass = this_oop->super(); | |
496 if (super_klass != NULL && !this_oop->is_interface() && Klass::cast(super_klass)->should_be_initialized()) { | |
497 Klass::cast(super_klass)->initialize(THREAD); | |
498 | |
499 if (HAS_PENDING_EXCEPTION) { | |
500 Handle e(THREAD, PENDING_EXCEPTION); | |
501 CLEAR_PENDING_EXCEPTION; | |
502 { | |
503 EXCEPTION_MARK; | |
504 this_oop->set_initialization_state_and_notify(initialization_error, THREAD); // Locks object, set state, and notify all waiting threads | |
505 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, superclass initialization error is thrown below | |
506 } | |
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507 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, instanceKlass::cast(this_oop()), -1,wait); |
0 | 508 THROW_OOP(e()); |
509 } | |
510 } | |
511 | |
512 // Step 8 | |
513 { | |
514 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl"); | |
515 JavaThread* jt = (JavaThread*)THREAD; | |
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516 DTRACE_CLASSINIT_PROBE_WAIT(clinit, instanceKlass::cast(this_oop()), -1,wait); |
0 | 517 // Timer includes any side effects of class initialization (resolution, |
518 // etc), but not recursive entry into call_class_initializer(). | |
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519 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(), |
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520 ClassLoader::perf_class_init_selftime(), |
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521 ClassLoader::perf_classes_inited(), |
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522 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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523 jt->get_thread_stat()->perf_timers_addr(), |
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524 PerfClassTraceTime::CLASS_CLINIT); |
0 | 525 this_oop->call_class_initializer(THREAD); |
526 } | |
527 | |
528 // Step 9 | |
529 if (!HAS_PENDING_EXCEPTION) { | |
530 this_oop->set_initialization_state_and_notify(fully_initialized, CHECK); | |
531 { ResourceMark rm(THREAD); | |
532 debug_only(this_oop->vtable()->verify(tty, true);) | |
533 } | |
534 } | |
535 else { | |
536 // Step 10 and 11 | |
537 Handle e(THREAD, PENDING_EXCEPTION); | |
538 CLEAR_PENDING_EXCEPTION; | |
539 { | |
540 EXCEPTION_MARK; | |
541 this_oop->set_initialization_state_and_notify(initialization_error, THREAD); | |
542 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below | |
543 } | |
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544 DTRACE_CLASSINIT_PROBE_WAIT(error, instanceKlass::cast(this_oop()), -1,wait); |
1142 | 545 if (e->is_a(SystemDictionary::Error_klass())) { |
0 | 546 THROW_OOP(e()); |
547 } else { | |
548 JavaCallArguments args(e); | |
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549 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(), |
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550 vmSymbols::throwable_void_signature(), |
0 | 551 &args); |
552 } | |
553 } | |
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554 DTRACE_CLASSINIT_PROBE_WAIT(end, instanceKlass::cast(this_oop()), -1,wait); |
0 | 555 } |
556 | |
557 | |
558 // Note: implementation moved to static method to expose the this pointer. | |
559 void instanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) { | |
560 instanceKlassHandle kh(THREAD, this->as_klassOop()); | |
561 set_initialization_state_and_notify_impl(kh, state, CHECK); | |
562 } | |
563 | |
564 void instanceKlass::set_initialization_state_and_notify_impl(instanceKlassHandle this_oop, ClassState state, TRAPS) { | |
565 ObjectLocker ol(this_oop, THREAD); | |
566 this_oop->set_init_state(state); | |
567 ol.notify_all(CHECK); | |
568 } | |
569 | |
570 void instanceKlass::add_implementor(klassOop k) { | |
571 assert(Compile_lock->owned_by_self(), ""); | |
572 // Filter out my subinterfaces. | |
573 // (Note: Interfaces are never on the subklass list.) | |
574 if (instanceKlass::cast(k)->is_interface()) return; | |
575 | |
576 // Filter out subclasses whose supers already implement me. | |
577 // (Note: CHA must walk subclasses of direct implementors | |
578 // in order to locate indirect implementors.) | |
579 klassOop sk = instanceKlass::cast(k)->super(); | |
580 if (sk != NULL && instanceKlass::cast(sk)->implements_interface(as_klassOop())) | |
581 // We only need to check one immediate superclass, since the | |
582 // implements_interface query looks at transitive_interfaces. | |
583 // Any supers of the super have the same (or fewer) transitive_interfaces. | |
584 return; | |
585 | |
586 // Update number of implementors | |
587 int i = _nof_implementors++; | |
588 | |
589 // Record this implementor, if there are not too many already | |
590 if (i < implementors_limit) { | |
591 assert(_implementors[i] == NULL, "should be exactly one implementor"); | |
592 oop_store_without_check((oop*)&_implementors[i], k); | |
593 } else if (i == implementors_limit) { | |
594 // clear out the list on first overflow | |
595 for (int i2 = 0; i2 < implementors_limit; i2++) | |
596 oop_store_without_check((oop*)&_implementors[i2], NULL); | |
597 } | |
598 | |
599 // The implementor also implements the transitive_interfaces | |
600 for (int index = 0; index < local_interfaces()->length(); index++) { | |
601 instanceKlass::cast(klassOop(local_interfaces()->obj_at(index)))->add_implementor(k); | |
602 } | |
603 } | |
604 | |
605 void instanceKlass::init_implementor() { | |
606 for (int i = 0; i < implementors_limit; i++) | |
607 oop_store_without_check((oop*)&_implementors[i], NULL); | |
608 _nof_implementors = 0; | |
609 } | |
610 | |
611 | |
612 void instanceKlass::process_interfaces(Thread *thread) { | |
613 // link this class into the implementors list of every interface it implements | |
614 KlassHandle this_as_oop (thread, this->as_klassOop()); | |
615 for (int i = local_interfaces()->length() - 1; i >= 0; i--) { | |
616 assert(local_interfaces()->obj_at(i)->is_klass(), "must be a klass"); | |
617 instanceKlass* interf = instanceKlass::cast(klassOop(local_interfaces()->obj_at(i))); | |
618 assert(interf->is_interface(), "expected interface"); | |
619 interf->add_implementor(this_as_oop()); | |
620 } | |
621 } | |
622 | |
623 bool instanceKlass::can_be_primary_super_slow() const { | |
624 if (is_interface()) | |
625 return false; | |
626 else | |
627 return Klass::can_be_primary_super_slow(); | |
628 } | |
629 | |
630 objArrayOop instanceKlass::compute_secondary_supers(int num_extra_slots, TRAPS) { | |
631 // The secondaries are the implemented interfaces. | |
632 instanceKlass* ik = instanceKlass::cast(as_klassOop()); | |
633 objArrayHandle interfaces (THREAD, ik->transitive_interfaces()); | |
634 int num_secondaries = num_extra_slots + interfaces->length(); | |
635 if (num_secondaries == 0) { | |
636 return Universe::the_empty_system_obj_array(); | |
637 } else if (num_extra_slots == 0) { | |
638 return interfaces(); | |
639 } else { | |
640 // a mix of both | |
641 objArrayOop secondaries = oopFactory::new_system_objArray(num_secondaries, CHECK_NULL); | |
642 for (int i = 0; i < interfaces->length(); i++) { | |
643 secondaries->obj_at_put(num_extra_slots+i, interfaces->obj_at(i)); | |
644 } | |
645 return secondaries; | |
646 } | |
647 } | |
648 | |
649 bool instanceKlass::compute_is_subtype_of(klassOop k) { | |
650 if (Klass::cast(k)->is_interface()) { | |
651 return implements_interface(k); | |
652 } else { | |
653 return Klass::compute_is_subtype_of(k); | |
654 } | |
655 } | |
656 | |
657 bool instanceKlass::implements_interface(klassOop k) const { | |
658 if (as_klassOop() == k) return true; | |
659 assert(Klass::cast(k)->is_interface(), "should be an interface class"); | |
660 for (int i = 0; i < transitive_interfaces()->length(); i++) { | |
661 if (transitive_interfaces()->obj_at(i) == k) { | |
662 return true; | |
663 } | |
664 } | |
665 return false; | |
666 } | |
667 | |
668 objArrayOop instanceKlass::allocate_objArray(int n, int length, TRAPS) { | |
669 if (length < 0) THROW_0(vmSymbols::java_lang_NegativeArraySizeException()); | |
670 if (length > arrayOopDesc::max_array_length(T_OBJECT)) { | |
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671 report_java_out_of_memory("Requested array size exceeds VM limit"); |
0 | 672 THROW_OOP_0(Universe::out_of_memory_error_array_size()); |
673 } | |
674 int size = objArrayOopDesc::object_size(length); | |
675 klassOop ak = array_klass(n, CHECK_NULL); | |
676 KlassHandle h_ak (THREAD, ak); | |
677 objArrayOop o = | |
678 (objArrayOop)CollectedHeap::array_allocate(h_ak, size, length, CHECK_NULL); | |
679 return o; | |
680 } | |
681 | |
682 instanceOop instanceKlass::register_finalizer(instanceOop i, TRAPS) { | |
683 if (TraceFinalizerRegistration) { | |
684 tty->print("Registered "); | |
685 i->print_value_on(tty); | |
686 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", (address)i); | |
687 } | |
688 instanceHandle h_i(THREAD, i); | |
689 // Pass the handle as argument, JavaCalls::call expects oop as jobjects | |
690 JavaValue result(T_VOID); | |
691 JavaCallArguments args(h_i); | |
692 methodHandle mh (THREAD, Universe::finalizer_register_method()); | |
693 JavaCalls::call(&result, mh, &args, CHECK_NULL); | |
694 return h_i(); | |
695 } | |
696 | |
697 instanceOop instanceKlass::allocate_instance(TRAPS) { | |
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698 assert(!oop_is_instanceMirror(), "wrong allocation path"); |
0 | 699 bool has_finalizer_flag = has_finalizer(); // Query before possible GC |
700 int size = size_helper(); // Query before forming handle. | |
701 | |
702 KlassHandle h_k(THREAD, as_klassOop()); | |
703 | |
704 instanceOop i; | |
705 | |
706 i = (instanceOop)CollectedHeap::obj_allocate(h_k, size, CHECK_NULL); | |
707 if (has_finalizer_flag && !RegisterFinalizersAtInit) { | |
708 i = register_finalizer(i, CHECK_NULL); | |
709 } | |
710 return i; | |
711 } | |
712 | |
713 instanceOop instanceKlass::allocate_permanent_instance(TRAPS) { | |
714 // Finalizer registration occurs in the Object.<init> constructor | |
715 // and constructors normally aren't run when allocating perm | |
716 // instances so simply disallow finalizable perm objects. This can | |
717 // be relaxed if a need for it is found. | |
718 assert(!has_finalizer(), "perm objects not allowed to have finalizers"); | |
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719 assert(!oop_is_instanceMirror(), "wrong allocation path"); |
0 | 720 int size = size_helper(); // Query before forming handle. |
721 KlassHandle h_k(THREAD, as_klassOop()); | |
722 instanceOop i = (instanceOop) | |
723 CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL); | |
724 return i; | |
725 } | |
726 | |
727 void instanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) { | |
728 if (is_interface() || is_abstract()) { | |
729 ResourceMark rm(THREAD); | |
730 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError() | |
731 : vmSymbols::java_lang_InstantiationException(), external_name()); | |
732 } | |
1142 | 733 if (as_klassOop() == SystemDictionary::Class_klass()) { |
0 | 734 ResourceMark rm(THREAD); |
735 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError() | |
736 : vmSymbols::java_lang_IllegalAccessException(), external_name()); | |
737 } | |
738 } | |
739 | |
740 klassOop instanceKlass::array_klass_impl(bool or_null, int n, TRAPS) { | |
741 instanceKlassHandle this_oop(THREAD, as_klassOop()); | |
742 return array_klass_impl(this_oop, or_null, n, THREAD); | |
743 } | |
744 | |
745 klassOop instanceKlass::array_klass_impl(instanceKlassHandle this_oop, bool or_null, int n, TRAPS) { | |
746 if (this_oop->array_klasses() == NULL) { | |
747 if (or_null) return NULL; | |
748 | |
749 ResourceMark rm; | |
750 JavaThread *jt = (JavaThread *)THREAD; | |
751 { | |
752 // Atomic creation of array_klasses | |
753 MutexLocker mc(Compile_lock, THREAD); // for vtables | |
754 MutexLocker ma(MultiArray_lock, THREAD); | |
755 | |
756 // Check if update has already taken place | |
757 if (this_oop->array_klasses() == NULL) { | |
758 objArrayKlassKlass* oakk = | |
759 (objArrayKlassKlass*)Universe::objArrayKlassKlassObj()->klass_part(); | |
760 | |
761 klassOop k = oakk->allocate_objArray_klass(1, this_oop, CHECK_NULL); | |
762 this_oop->set_array_klasses(k); | |
763 } | |
764 } | |
765 } | |
766 // _this will always be set at this point | |
767 objArrayKlass* oak = (objArrayKlass*)this_oop->array_klasses()->klass_part(); | |
768 if (or_null) { | |
769 return oak->array_klass_or_null(n); | |
770 } | |
771 return oak->array_klass(n, CHECK_NULL); | |
772 } | |
773 | |
774 klassOop instanceKlass::array_klass_impl(bool or_null, TRAPS) { | |
775 return array_klass_impl(or_null, 1, THREAD); | |
776 } | |
777 | |
778 void instanceKlass::call_class_initializer(TRAPS) { | |
779 instanceKlassHandle ik (THREAD, as_klassOop()); | |
780 call_class_initializer_impl(ik, THREAD); | |
781 } | |
782 | |
783 static int call_class_initializer_impl_counter = 0; // for debugging | |
784 | |
785 methodOop instanceKlass::class_initializer() { | |
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786 methodOop clinit = find_method( |
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787 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature()); |
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788 if (clinit != NULL && clinit->has_valid_initializer_flags()) { |
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789 return clinit; |
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790 } |
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791 return NULL; |
0 | 792 } |
793 | |
794 void instanceKlass::call_class_initializer_impl(instanceKlassHandle this_oop, TRAPS) { | |
795 methodHandle h_method(THREAD, this_oop->class_initializer()); | |
796 assert(!this_oop->is_initialized(), "we cannot initialize twice"); | |
797 if (TraceClassInitialization) { | |
798 tty->print("%d Initializing ", call_class_initializer_impl_counter++); | |
799 this_oop->name()->print_value(); | |
800 tty->print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", (address)this_oop()); | |
801 } | |
802 if (h_method() != NULL) { | |
803 JavaCallArguments args; // No arguments | |
804 JavaValue result(T_VOID); | |
805 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args) | |
806 } | |
807 } | |
808 | |
809 | |
810 void instanceKlass::mask_for(methodHandle method, int bci, | |
811 InterpreterOopMap* entry_for) { | |
812 // Dirty read, then double-check under a lock. | |
813 if (_oop_map_cache == NULL) { | |
814 // Otherwise, allocate a new one. | |
815 MutexLocker x(OopMapCacheAlloc_lock); | |
816 // First time use. Allocate a cache in C heap | |
817 if (_oop_map_cache == NULL) { | |
818 _oop_map_cache = new OopMapCache(); | |
819 } | |
820 } | |
821 // _oop_map_cache is constant after init; lookup below does is own locking. | |
822 _oop_map_cache->lookup(method, bci, entry_for); | |
823 } | |
824 | |
825 | |
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826 bool instanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { |
3938 | 827 for (JavaFieldStream fs(as_klassOop()); !fs.done(); fs.next()) { |
828 Symbol* f_name = fs.name(); | |
829 Symbol* f_sig = fs.signature(); | |
0 | 830 if (f_name == name && f_sig == sig) { |
3938 | 831 fd->initialize(as_klassOop(), fs.index()); |
0 | 832 return true; |
833 } | |
834 } | |
835 return false; | |
836 } | |
837 | |
838 | |
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839 void instanceKlass::shared_symbols_iterate(SymbolClosure* closure) { |
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840 Klass::shared_symbols_iterate(closure); |
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841 closure->do_symbol(&_generic_signature); |
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842 closure->do_symbol(&_source_file_name); |
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843 closure->do_symbol(&_source_debug_extension); |
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844 |
3938 | 845 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { |
846 int name_index = fs.name_index(); | |
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847 closure->do_symbol(constants()->symbol_at_addr(name_index)); |
3938 | 848 int sig_index = fs.signature_index(); |
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849 closure->do_symbol(constants()->symbol_at_addr(sig_index)); |
0 | 850 } |
851 } | |
852 | |
853 | |
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854 klassOop instanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { |
0 | 855 const int n = local_interfaces()->length(); |
856 for (int i = 0; i < n; i++) { | |
857 klassOop intf1 = klassOop(local_interfaces()->obj_at(i)); | |
858 assert(Klass::cast(intf1)->is_interface(), "just checking type"); | |
859 // search for field in current interface | |
860 if (instanceKlass::cast(intf1)->find_local_field(name, sig, fd)) { | |
861 assert(fd->is_static(), "interface field must be static"); | |
862 return intf1; | |
863 } | |
864 // search for field in direct superinterfaces | |
865 klassOop intf2 = instanceKlass::cast(intf1)->find_interface_field(name, sig, fd); | |
866 if (intf2 != NULL) return intf2; | |
867 } | |
868 // otherwise field lookup fails | |
869 return NULL; | |
870 } | |
871 | |
872 | |
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873 klassOop instanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { |
0 | 874 // search order according to newest JVM spec (5.4.3.2, p.167). |
875 // 1) search for field in current klass | |
876 if (find_local_field(name, sig, fd)) { | |
877 return as_klassOop(); | |
878 } | |
879 // 2) search for field recursively in direct superinterfaces | |
880 { klassOop intf = find_interface_field(name, sig, fd); | |
881 if (intf != NULL) return intf; | |
882 } | |
883 // 3) apply field lookup recursively if superclass exists | |
884 { klassOop supr = super(); | |
885 if (supr != NULL) return instanceKlass::cast(supr)->find_field(name, sig, fd); | |
886 } | |
887 // 4) otherwise field lookup fails | |
888 return NULL; | |
889 } | |
890 | |
891 | |
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892 klassOop instanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const { |
0 | 893 // search order according to newest JVM spec (5.4.3.2, p.167). |
894 // 1) search for field in current klass | |
895 if (find_local_field(name, sig, fd)) { | |
896 if (fd->is_static() == is_static) return as_klassOop(); | |
897 } | |
898 // 2) search for field recursively in direct superinterfaces | |
899 if (is_static) { | |
900 klassOop intf = find_interface_field(name, sig, fd); | |
901 if (intf != NULL) return intf; | |
902 } | |
903 // 3) apply field lookup recursively if superclass exists | |
904 { klassOop supr = super(); | |
905 if (supr != NULL) return instanceKlass::cast(supr)->find_field(name, sig, is_static, fd); | |
906 } | |
907 // 4) otherwise field lookup fails | |
908 return NULL; | |
909 } | |
910 | |
911 | |
912 bool instanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { | |
3938 | 913 for (JavaFieldStream fs(as_klassOop()); !fs.done(); fs.next()) { |
914 if (fs.offset() == offset) { | |
915 fd->initialize(as_klassOop(), fs.index()); | |
0 | 916 if (fd->is_static() == is_static) return true; |
917 } | |
918 } | |
919 return false; | |
920 } | |
921 | |
922 | |
923 bool instanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { | |
924 klassOop klass = as_klassOop(); | |
925 while (klass != NULL) { | |
926 if (instanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) { | |
927 return true; | |
928 } | |
929 klass = Klass::cast(klass)->super(); | |
930 } | |
931 return false; | |
932 } | |
933 | |
934 | |
935 void instanceKlass::methods_do(void f(methodOop method)) { | |
936 int len = methods()->length(); | |
937 for (int index = 0; index < len; index++) { | |
938 methodOop m = methodOop(methods()->obj_at(index)); | |
939 assert(m->is_method(), "must be method"); | |
940 f(m); | |
941 } | |
942 } | |
943 | |
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944 |
0 | 945 void instanceKlass::do_local_static_fields(FieldClosure* cl) { |
3938 | 946 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { |
947 if (fs.access_flags().is_static()) { | |
948 fieldDescriptor fd; | |
949 fd.initialize(as_klassOop(), fs.index()); | |
950 cl->do_field(&fd); | |
951 } | |
0 | 952 } |
953 } | |
954 | |
955 | |
956 void instanceKlass::do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS) { | |
957 instanceKlassHandle h_this(THREAD, as_klassOop()); | |
958 do_local_static_fields_impl(h_this, f, CHECK); | |
959 } | |
960 | |
961 | |
962 void instanceKlass::do_local_static_fields_impl(instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS) { | |
3938 | 963 for (JavaFieldStream fs(this_oop()); !fs.done(); fs.next()) { |
964 if (fs.access_flags().is_static()) { | |
965 fieldDescriptor fd; | |
966 fd.initialize(this_oop(), fs.index()); | |
967 f(&fd, CHECK); | |
968 } | |
0 | 969 } |
970 } | |
971 | |
972 | |
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973 static int compare_fields_by_offset(int* a, int* b) { |
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974 return a[0] - b[0]; |
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975 } |
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976 |
0 | 977 void instanceKlass::do_nonstatic_fields(FieldClosure* cl) { |
978 instanceKlass* super = superklass(); | |
979 if (super != NULL) { | |
980 super->do_nonstatic_fields(cl); | |
981 } | |
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982 fieldDescriptor fd; |
3938 | 983 int length = java_fields_count(); |
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984 // In DebugInfo nonstatic fields are sorted by offset. |
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985 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1)); |
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986 int j = 0; |
3938 | 987 for (int i = 0; i < length; i += 1) { |
0 | 988 fd.initialize(as_klassOop(), i); |
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989 if (!fd.is_static()) { |
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990 fields_sorted[j + 0] = fd.offset(); |
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991 fields_sorted[j + 1] = i; |
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992 j += 2; |
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993 } |
0 | 994 } |
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995 if (j > 0) { |
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996 length = j; |
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997 // _sort_Fn is defined in growableArray.hpp. |
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998 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset); |
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999 for (int i = 0; i < length; i += 2) { |
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1000 fd.initialize(as_klassOop(), fields_sorted[i + 1]); |
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1001 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields"); |
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1002 cl->do_field(&fd); |
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1003 } |
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1004 } |
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1005 FREE_C_HEAP_ARRAY(int, fields_sorted); |
0 | 1006 } |
1007 | |
1008 | |
1009 void instanceKlass::array_klasses_do(void f(klassOop k)) { | |
1010 if (array_klasses() != NULL) | |
1011 arrayKlass::cast(array_klasses())->array_klasses_do(f); | |
1012 } | |
1013 | |
1014 | |
1015 void instanceKlass::with_array_klasses_do(void f(klassOop k)) { | |
1016 f(as_klassOop()); | |
1017 array_klasses_do(f); | |
1018 } | |
1019 | |
1020 #ifdef ASSERT | |
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1021 static int linear_search(objArrayOop methods, Symbol* name, Symbol* signature) { |
0 | 1022 int len = methods->length(); |
1023 for (int index = 0; index < len; index++) { | |
1024 methodOop m = (methodOop)(methods->obj_at(index)); | |
1025 assert(m->is_method(), "must be method"); | |
1026 if (m->signature() == signature && m->name() == name) { | |
1027 return index; | |
1028 } | |
1029 } | |
1030 return -1; | |
1031 } | |
1032 #endif | |
1033 | |
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1034 methodOop instanceKlass::find_method(Symbol* name, Symbol* signature) const { |
0 | 1035 return instanceKlass::find_method(methods(), name, signature); |
1036 } | |
1037 | |
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1038 methodOop instanceKlass::find_method(objArrayOop methods, Symbol* name, Symbol* signature) { |
0 | 1039 int len = methods->length(); |
1040 // methods are sorted, so do binary search | |
1041 int l = 0; | |
1042 int h = len - 1; | |
1043 while (l <= h) { | |
1044 int mid = (l + h) >> 1; | |
1045 methodOop m = (methodOop)methods->obj_at(mid); | |
1046 assert(m->is_method(), "must be method"); | |
1047 int res = m->name()->fast_compare(name); | |
1048 if (res == 0) { | |
1049 // found matching name; do linear search to find matching signature | |
1050 // first, quick check for common case | |
1051 if (m->signature() == signature) return m; | |
1052 // search downwards through overloaded methods | |
1053 int i; | |
1054 for (i = mid - 1; i >= l; i--) { | |
1055 methodOop m = (methodOop)methods->obj_at(i); | |
1056 assert(m->is_method(), "must be method"); | |
1057 if (m->name() != name) break; | |
1058 if (m->signature() == signature) return m; | |
1059 } | |
1060 // search upwards | |
1061 for (i = mid + 1; i <= h; i++) { | |
1062 methodOop m = (methodOop)methods->obj_at(i); | |
1063 assert(m->is_method(), "must be method"); | |
1064 if (m->name() != name) break; | |
1065 if (m->signature() == signature) return m; | |
1066 } | |
1067 // not found | |
1068 #ifdef ASSERT | |
1069 int index = linear_search(methods, name, signature); | |
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1070 assert(index == -1, err_msg("binary search should have found entry %d", index)); |
0 | 1071 #endif |
1072 return NULL; | |
1073 } else if (res < 0) { | |
1074 l = mid + 1; | |
1075 } else { | |
1076 h = mid - 1; | |
1077 } | |
1078 } | |
1079 #ifdef ASSERT | |
1080 int index = linear_search(methods, name, signature); | |
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1081 assert(index == -1, err_msg("binary search should have found entry %d", index)); |
0 | 1082 #endif |
1083 return NULL; | |
1084 } | |
1085 | |
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1086 methodOop instanceKlass::uncached_lookup_method(Symbol* name, Symbol* signature) const { |
0 | 1087 klassOop klass = as_klassOop(); |
1088 while (klass != NULL) { | |
1089 methodOop method = instanceKlass::cast(klass)->find_method(name, signature); | |
1090 if (method != NULL) return method; | |
1091 klass = instanceKlass::cast(klass)->super(); | |
1092 } | |
1093 return NULL; | |
1094 } | |
1095 | |
1096 // lookup a method in all the interfaces that this class implements | |
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1097 methodOop instanceKlass::lookup_method_in_all_interfaces(Symbol* name, |
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1098 Symbol* signature) const { |
0 | 1099 objArrayOop all_ifs = instanceKlass::cast(as_klassOop())->transitive_interfaces(); |
1100 int num_ifs = all_ifs->length(); | |
1101 instanceKlass *ik = NULL; | |
1102 for (int i = 0; i < num_ifs; i++) { | |
1103 ik = instanceKlass::cast(klassOop(all_ifs->obj_at(i))); | |
1104 methodOop m = ik->lookup_method(name, signature); | |
1105 if (m != NULL) { | |
1106 return m; | |
1107 } | |
1108 } | |
1109 return NULL; | |
1110 } | |
1111 | |
1112 /* jni_id_for_impl for jfieldIds only */ | |
1113 JNIid* instanceKlass::jni_id_for_impl(instanceKlassHandle this_oop, int offset) { | |
1114 MutexLocker ml(JfieldIdCreation_lock); | |
1115 // Retry lookup after we got the lock | |
1116 JNIid* probe = this_oop->jni_ids() == NULL ? NULL : this_oop->jni_ids()->find(offset); | |
1117 if (probe == NULL) { | |
1118 // Slow case, allocate new static field identifier | |
1119 probe = new JNIid(this_oop->as_klassOop(), offset, this_oop->jni_ids()); | |
1120 this_oop->set_jni_ids(probe); | |
1121 } | |
1122 return probe; | |
1123 } | |
1124 | |
1125 | |
1126 /* jni_id_for for jfieldIds only */ | |
1127 JNIid* instanceKlass::jni_id_for(int offset) { | |
1128 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset); | |
1129 if (probe == NULL) { | |
1130 probe = jni_id_for_impl(this->as_klassOop(), offset); | |
1131 } | |
1132 return probe; | |
1133 } | |
1134 | |
1135 | |
1136 // Lookup or create a jmethodID. | |
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1137 // This code is called by the VMThread and JavaThreads so the |
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1138 // locking has to be done very carefully to avoid deadlocks |
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1139 // and/or other cache consistency problems. |
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1140 // |
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1141 jmethodID instanceKlass::get_jmethod_id(instanceKlassHandle ik_h, methodHandle method_h) { |
0 | 1142 size_t idnum = (size_t)method_h->method_idnum(); |
1143 jmethodID* jmeths = ik_h->methods_jmethod_ids_acquire(); | |
1144 size_t length = 0; | |
1145 jmethodID id = NULL; | |
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1146 |
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1147 // We use a double-check locking idiom here because this cache is |
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1148 // performance sensitive. In the normal system, this cache only |
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1149 // transitions from NULL to non-NULL which is safe because we use |
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1150 // release_set_methods_jmethod_ids() to advertise the new cache. |
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1151 // A partially constructed cache should never be seen by a racing |
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1152 // thread. We also use release_store_ptr() to save a new jmethodID |
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1153 // in the cache so a partially constructed jmethodID should never be |
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1154 // seen either. Cache reads of existing jmethodIDs proceed without a |
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1155 // lock, but cache writes of a new jmethodID requires uniqueness and |
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1156 // creation of the cache itself requires no leaks so a lock is |
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1157 // generally acquired in those two cases. |
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1158 // |
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1159 // If the RedefineClasses() API has been used, then this cache can |
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1160 // grow and we'll have transitions from non-NULL to bigger non-NULL. |
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1161 // Cache creation requires no leaks and we require safety between all |
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1162 // cache accesses and freeing of the old cache so a lock is generally |
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1163 // acquired when the RedefineClasses() API has been used. |
0 | 1164 |
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1165 if (jmeths != NULL) { |
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1166 // the cache already exists |
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1167 if (!ik_h->idnum_can_increment()) { |
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1168 // the cache can't grow so we can just get the current values |
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1169 get_jmethod_id_length_value(jmeths, idnum, &length, &id); |
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1170 } else { |
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1171 // cache can grow so we have to be more careful |
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1172 if (Threads::number_of_threads() == 0 || |
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1173 SafepointSynchronize::is_at_safepoint()) { |
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1174 // we're single threaded or at a safepoint - no locking needed |
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1175 get_jmethod_id_length_value(jmeths, idnum, &length, &id); |
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1176 } else { |
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1177 MutexLocker ml(JmethodIdCreation_lock); |
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1178 get_jmethod_id_length_value(jmeths, idnum, &length, &id); |
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1179 } |
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1180 } |
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1181 } |
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1182 // implied else: |
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1183 // we need to allocate a cache so default length and id values are good |
0 | 1184 |
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1185 if (jmeths == NULL || // no cache yet |
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1186 length <= idnum || // cache is too short |
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1187 id == NULL) { // cache doesn't contain entry |
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1188 |
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1189 // This function can be called by the VMThread so we have to do all |
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1190 // things that might block on a safepoint before grabbing the lock. |
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1191 // Otherwise, we can deadlock with the VMThread or have a cache |
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1192 // consistency issue. These vars keep track of what we might have |
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1193 // to free after the lock is dropped. |
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1194 jmethodID to_dealloc_id = NULL; |
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1195 jmethodID* to_dealloc_jmeths = NULL; |
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1196 |
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1197 // may not allocate new_jmeths or use it if we allocate it |
0 | 1198 jmethodID* new_jmeths = NULL; |
1199 if (length <= idnum) { | |
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1200 // allocate a new cache that might be used |
0 | 1201 size_t size = MAX2(idnum+1, (size_t)ik_h->idnum_allocated_count()); |
1202 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1); | |
1203 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID)); | |
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1204 // cache size is stored in element[0], other elements offset by one |
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1205 new_jmeths[0] = (jmethodID)size; |
0 | 1206 } |
1207 | |
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1208 // allocate a new jmethodID that might be used |
0 | 1209 jmethodID new_id = NULL; |
1210 if (method_h->is_old() && !method_h->is_obsolete()) { | |
1211 // The method passed in is old (but not obsolete), we need to use the current version | |
1212 methodOop current_method = ik_h->method_with_idnum((int)idnum); | |
1213 assert(current_method != NULL, "old and but not obsolete, so should exist"); | |
1214 methodHandle current_method_h(current_method == NULL? method_h() : current_method); | |
1215 new_id = JNIHandles::make_jmethod_id(current_method_h); | |
1216 } else { | |
1217 // It is the current version of the method or an obsolete method, | |
1218 // use the version passed in | |
1219 new_id = JNIHandles::make_jmethod_id(method_h); | |
1220 } | |
1221 | |
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1222 if (Threads::number_of_threads() == 0 || |
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1223 SafepointSynchronize::is_at_safepoint()) { |
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1224 // we're single threaded or at a safepoint - no locking needed |
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1225 id = get_jmethod_id_fetch_or_update(ik_h, idnum, new_id, new_jmeths, |
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1226 &to_dealloc_id, &to_dealloc_jmeths); |
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1227 } else { |
0 | 1228 MutexLocker ml(JmethodIdCreation_lock); |
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1229 id = get_jmethod_id_fetch_or_update(ik_h, idnum, new_id, new_jmeths, |
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1230 &to_dealloc_id, &to_dealloc_jmeths); |
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1231 } |
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1232 |
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1233 // The lock has been dropped so we can free resources. |
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1234 // Free up either the old cache or the new cache if we allocated one. |
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1235 if (to_dealloc_jmeths != NULL) { |
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1236 FreeHeap(to_dealloc_jmeths); |
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1237 } |
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1238 // free up the new ID since it wasn't needed |
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1239 if (to_dealloc_id != NULL) { |
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1240 JNIHandles::destroy_jmethod_id(to_dealloc_id); |
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1241 } |
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1242 } |
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1243 return id; |
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1244 } |
0 | 1245 |
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1246 |
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1247 // Common code to fetch the jmethodID from the cache or update the |
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1248 // cache with the new jmethodID. This function should never do anything |
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1249 // that causes the caller to go to a safepoint or we can deadlock with |
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1250 // the VMThread or have cache consistency issues. |
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1251 // |
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1252 jmethodID instanceKlass::get_jmethod_id_fetch_or_update( |
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1253 instanceKlassHandle ik_h, size_t idnum, jmethodID new_id, |
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1254 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p, |
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1255 jmethodID** to_dealloc_jmeths_p) { |
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1256 assert(new_id != NULL, "sanity check"); |
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1257 assert(to_dealloc_id_p != NULL, "sanity check"); |
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1258 assert(to_dealloc_jmeths_p != NULL, "sanity check"); |
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1259 assert(Threads::number_of_threads() == 0 || |
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1260 SafepointSynchronize::is_at_safepoint() || |
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1261 JmethodIdCreation_lock->owned_by_self(), "sanity check"); |
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1262 |
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1263 // reacquire the cache - we are locked, single threaded or at a safepoint |
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1264 jmethodID* jmeths = ik_h->methods_jmethod_ids_acquire(); |
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1265 jmethodID id = NULL; |
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1266 size_t length = 0; |
0 | 1267 |
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1268 if (jmeths == NULL || // no cache yet |
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1269 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short |
49
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1270 if (jmeths != NULL) { |
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1271 // copy any existing entries from the old cache |
49
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1272 for (size_t index = 0; index < length; index++) { |
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1273 new_jmeths[index+1] = jmeths[index+1]; |
0 | 1274 } |
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1275 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete |
0 | 1276 } |
49
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1277 ik_h->release_set_methods_jmethod_ids(jmeths = new_jmeths); |
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1278 } else { |
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1279 // fetch jmethodID (if any) from the existing cache |
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1280 id = jmeths[idnum+1]; |
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1281 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete |
49
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1282 } |
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1283 if (id == NULL) { |
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1284 // No matching jmethodID in the existing cache or we have a new |
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1285 // cache or we just grew the cache. This cache write is done here |
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1286 // by the first thread to win the foot race because a jmethodID |
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1287 // needs to be unique once it is generally available. |
49
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1288 id = new_id; |
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1289 |
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1290 // The jmethodID cache can be read while unlocked so we have to |
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1291 // make sure the new jmethodID is complete before installing it |
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1292 // in the cache. |
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1293 OrderAccess::release_store_ptr(&jmeths[idnum+1], id); |
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1294 } else { |
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1295 *to_dealloc_id_p = new_id; // save new id for later delete |
0 | 1296 } |
1297 return id; | |
1298 } | |
1299 | |
1300 | |
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1301 // Common code to get the jmethodID cache length and the jmethodID |
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1302 // value at index idnum if there is one. |
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1303 // |
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1304 void instanceKlass::get_jmethod_id_length_value(jmethodID* cache, |
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1305 size_t idnum, size_t *length_p, jmethodID* id_p) { |
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1306 assert(cache != NULL, "sanity check"); |
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1307 assert(length_p != NULL, "sanity check"); |
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1308 assert(id_p != NULL, "sanity check"); |
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1309 |
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1310 // cache size is stored in element[0], other elements offset by one |
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1311 *length_p = (size_t)cache[0]; |
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1312 if (*length_p <= idnum) { // cache is too short |
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1313 *id_p = NULL; |
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1314 } else { |
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1315 *id_p = cache[idnum+1]; // fetch jmethodID (if any) |
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1316 } |
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1317 } |
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1318 |
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1319 |
0 | 1320 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles |
1321 jmethodID instanceKlass::jmethod_id_or_null(methodOop method) { | |
1322 size_t idnum = (size_t)method->method_idnum(); | |
1323 jmethodID* jmeths = methods_jmethod_ids_acquire(); | |
1324 size_t length; // length assigned as debugging crumb | |
1325 jmethodID id = NULL; | |
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1326 if (jmeths != NULL && // If there is a cache |
0 | 1327 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough, |
1328 id = jmeths[idnum+1]; // Look up the id (may be NULL) | |
1329 } | |
1330 return id; | |
1331 } | |
1332 | |
1333 | |
1334 // Cache an itable index | |
1335 void instanceKlass::set_cached_itable_index(size_t idnum, int index) { | |
1336 int* indices = methods_cached_itable_indices_acquire(); | |
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1337 int* to_dealloc_indices = NULL; |
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1338 |
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1339 // We use a double-check locking idiom here because this cache is |
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1340 // performance sensitive. In the normal system, this cache only |
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1341 // transitions from NULL to non-NULL which is safe because we use |
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1342 // release_set_methods_cached_itable_indices() to advertise the |
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1343 // new cache. A partially constructed cache should never be seen |
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1344 // by a racing thread. Cache reads and writes proceed without a |
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1345 // lock, but creation of the cache itself requires no leaks so a |
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1346 // lock is generally acquired in that case. |
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1347 // |
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1348 // If the RedefineClasses() API has been used, then this cache can |
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1349 // grow and we'll have transitions from non-NULL to bigger non-NULL. |
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1350 // Cache creation requires no leaks and we require safety between all |
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1351 // cache accesses and freeing of the old cache so a lock is generally |
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1352 // acquired when the RedefineClasses() API has been used. |
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1353 |
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1354 if (indices == NULL || idnum_can_increment()) { |
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1355 // we need a cache or the cache can grow |
0 | 1356 MutexLocker ml(JNICachedItableIndex_lock); |
977
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1357 // reacquire the cache to see if another thread already did the work |
0 | 1358 indices = methods_cached_itable_indices_acquire(); |
1359 size_t length = 0; | |
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1360 // cache size is stored in element[0], other elements offset by one |
0 | 1361 if (indices == NULL || (length = (size_t)indices[0]) <= idnum) { |
1362 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count()); | |
1363 int* new_indices = NEW_C_HEAP_ARRAY(int, size+1); | |
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1364 new_indices[0] = (int)size; |
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1365 // copy any existing entries |
0 | 1366 size_t i; |
1367 for (i = 0; i < length; i++) { | |
1368 new_indices[i+1] = indices[i+1]; | |
1369 } | |
1370 // Set all the rest to -1 | |
1371 for (i = length; i < size; i++) { | |
1372 new_indices[i+1] = -1; | |
1373 } | |
1374 if (indices != NULL) { | |
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1375 // We have an old cache to delete so save it for after we |
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1376 // drop the lock. |
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1377 to_dealloc_indices = indices; |
0 | 1378 } |
1379 release_set_methods_cached_itable_indices(indices = new_indices); | |
1380 } | |
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1381 |
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1382 if (idnum_can_increment()) { |
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1383 // this cache can grow so we have to write to it safely |
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1384 indices[idnum+1] = index; |
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1385 } |
0 | 1386 } else { |
1387 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
1388 } | |
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1389 |
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1390 if (!idnum_can_increment()) { |
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1391 // The cache cannot grow and this JNI itable index value does not |
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1392 // have to be unique like a jmethodID. If there is a race to set it, |
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1393 // it doesn't matter. |
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1394 indices[idnum+1] = index; |
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1395 } |
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1396 |
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1397 if (to_dealloc_indices != NULL) { |
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1398 // we allocated a new cache so free the old one |
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1399 FreeHeap(to_dealloc_indices); |
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1400 } |
0 | 1401 } |
1402 | |
1403 | |
1404 // Retrieve a cached itable index | |
1405 int instanceKlass::cached_itable_index(size_t idnum) { | |
1406 int* indices = methods_cached_itable_indices_acquire(); | |
1407 if (indices != NULL && ((size_t)indices[0]) > idnum) { | |
1408 // indices exist and are long enough, retrieve possible cached | |
1409 return indices[idnum+1]; | |
1410 } | |
1411 return -1; | |
1412 } | |
1413 | |
1414 | |
1415 // | |
1416 // Walk the list of dependent nmethods searching for nmethods which | |
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1417 // are dependent on the changes that were passed in and mark them for |
0 | 1418 // deoptimization. Returns the number of nmethods found. |
1419 // | |
1420 int instanceKlass::mark_dependent_nmethods(DepChange& changes) { | |
1421 assert_locked_or_safepoint(CodeCache_lock); | |
1422 int found = 0; | |
1423 nmethodBucket* b = _dependencies; | |
1424 while (b != NULL) { | |
1425 nmethod* nm = b->get_nmethod(); | |
1426 // since dependencies aren't removed until an nmethod becomes a zombie, | |
1427 // the dependency list may contain nmethods which aren't alive. | |
1428 if (nm->is_alive() && !nm->is_marked_for_deoptimization() && nm->check_dependency_on(changes)) { | |
1429 if (TraceDependencies) { | |
1430 ResourceMark rm; | |
1431 tty->print_cr("Marked for deoptimization"); | |
1432 tty->print_cr(" context = %s", this->external_name()); | |
1433 changes.print(); | |
1434 nm->print(); | |
1435 nm->print_dependencies(); | |
1436 } | |
1437 nm->mark_for_deoptimization(); | |
1438 found++; | |
1439 } | |
1440 b = b->next(); | |
1441 } | |
1442 return found; | |
1443 } | |
1444 | |
1445 | |
1446 // | |
1447 // Add an nmethodBucket to the list of dependencies for this nmethod. | |
1448 // It's possible that an nmethod has multiple dependencies on this klass | |
1449 // so a count is kept for each bucket to guarantee that creation and | |
1450 // deletion of dependencies is consistent. | |
1451 // | |
1452 void instanceKlass::add_dependent_nmethod(nmethod* nm) { | |
1453 assert_locked_or_safepoint(CodeCache_lock); | |
1454 nmethodBucket* b = _dependencies; | |
1455 nmethodBucket* last = NULL; | |
1456 while (b != NULL) { | |
1457 if (nm == b->get_nmethod()) { | |
1458 b->increment(); | |
1459 return; | |
1460 } | |
1461 b = b->next(); | |
1462 } | |
1463 _dependencies = new nmethodBucket(nm, _dependencies); | |
1464 } | |
1465 | |
1466 | |
1467 // | |
1468 // Decrement count of the nmethod in the dependency list and remove | |
1469 // the bucket competely when the count goes to 0. This method must | |
1470 // find a corresponding bucket otherwise there's a bug in the | |
1471 // recording of dependecies. | |
1472 // | |
1473 void instanceKlass::remove_dependent_nmethod(nmethod* nm) { | |
1474 assert_locked_or_safepoint(CodeCache_lock); | |
1475 nmethodBucket* b = _dependencies; | |
1476 nmethodBucket* last = NULL; | |
1477 while (b != NULL) { | |
1478 if (nm == b->get_nmethod()) { | |
1479 if (b->decrement() == 0) { | |
1480 if (last == NULL) { | |
1481 _dependencies = b->next(); | |
1482 } else { | |
1483 last->set_next(b->next()); | |
1484 } | |
1485 delete b; | |
1486 } | |
1487 return; | |
1488 } | |
1489 last = b; | |
1490 b = b->next(); | |
1491 } | |
1492 #ifdef ASSERT | |
1493 tty->print_cr("### %s can't find dependent nmethod:", this->external_name()); | |
1494 nm->print(); | |
1495 #endif // ASSERT | |
1496 ShouldNotReachHere(); | |
1497 } | |
1498 | |
1499 | |
1500 #ifndef PRODUCT | |
1501 void instanceKlass::print_dependent_nmethods(bool verbose) { | |
1502 nmethodBucket* b = _dependencies; | |
1503 int idx = 0; | |
1504 while (b != NULL) { | |
1505 nmethod* nm = b->get_nmethod(); | |
1506 tty->print("[%d] count=%d { ", idx++, b->count()); | |
1507 if (!verbose) { | |
1508 nm->print_on(tty, "nmethod"); | |
1509 tty->print_cr(" } "); | |
1510 } else { | |
1511 nm->print(); | |
1512 nm->print_dependencies(); | |
1513 tty->print_cr("--- } "); | |
1514 } | |
1515 b = b->next(); | |
1516 } | |
1517 } | |
1518 | |
1519 | |
1520 bool instanceKlass::is_dependent_nmethod(nmethod* nm) { | |
1521 nmethodBucket* b = _dependencies; | |
1522 while (b != NULL) { | |
1523 if (nm == b->get_nmethod()) { | |
1524 return true; | |
1525 } | |
1526 b = b->next(); | |
1527 } | |
1528 return false; | |
1529 } | |
1530 #endif //PRODUCT | |
1531 | |
1532 | |
113
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1533 #ifdef ASSERT |
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1534 template <class T> void assert_is_in(T *p) { |
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1535 T heap_oop = oopDesc::load_heap_oop(p); |
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1536 if (!oopDesc::is_null(heap_oop)) { |
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1537 oop o = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1538 assert(Universe::heap()->is_in(o), "should be in heap"); |
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1539 } |
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1540 } |
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1541 template <class T> void assert_is_in_closed_subset(T *p) { |
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1542 T heap_oop = oopDesc::load_heap_oop(p); |
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1543 if (!oopDesc::is_null(heap_oop)) { |
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1544 oop o = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1545 assert(Universe::heap()->is_in_closed_subset(o), "should be in closed"); |
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1546 } |
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1547 } |
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1548 template <class T> void assert_is_in_reserved(T *p) { |
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1549 T heap_oop = oopDesc::load_heap_oop(p); |
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1550 if (!oopDesc::is_null(heap_oop)) { |
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1551 oop o = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1552 assert(Universe::heap()->is_in_reserved(o), "should be in reserved"); |
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1553 } |
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1554 } |
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1555 template <class T> void assert_nothing(T *p) {} |
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1556 |
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1557 #else |
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1558 template <class T> void assert_is_in(T *p) {} |
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1559 template <class T> void assert_is_in_closed_subset(T *p) {} |
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1560 template <class T> void assert_is_in_reserved(T *p) {} |
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1561 template <class T> void assert_nothing(T *p) {} |
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1562 #endif // ASSERT |
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1563 |
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1564 // |
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1565 // Macros that iterate over areas of oops which are specialized on type of |
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1566 // oop pointer either narrow or wide, depending on UseCompressedOops |
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1567 // |
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1568 // Parameters are: |
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1569 // T - type of oop to point to (either oop or narrowOop) |
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1570 // start_p - starting pointer for region to iterate over |
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1571 // count - number of oops or narrowOops to iterate over |
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1572 // do_oop - action to perform on each oop (it's arbitrary C code which |
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1573 // makes it more efficient to put in a macro rather than making |
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1574 // it a template function) |
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1575 // assert_fn - assert function which is template function because performance |
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1576 // doesn't matter when enabled. |
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1577 #define InstanceKlass_SPECIALIZED_OOP_ITERATE( \ |
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1578 T, start_p, count, do_oop, \ |
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1579 assert_fn) \ |
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1580 { \ |
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1581 T* p = (T*)(start_p); \ |
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1582 T* const end = p + (count); \ |
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1583 while (p < end) { \ |
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1584 (assert_fn)(p); \ |
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1585 do_oop; \ |
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1586 ++p; \ |
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1587 } \ |
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1588 } |
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1589 |
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1590 #define InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE( \ |
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1591 T, start_p, count, do_oop, \ |
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1592 assert_fn) \ |
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1593 { \ |
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1594 T* const start = (T*)(start_p); \ |
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1595 T* p = start + (count); \ |
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1596 while (start < p) { \ |
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1597 --p; \ |
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1598 (assert_fn)(p); \ |
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1599 do_oop; \ |
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1600 } \ |
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1601 } |
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1602 |
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1603 #define InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE( \ |
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1604 T, start_p, count, low, high, \ |
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1605 do_oop, assert_fn) \ |
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1606 { \ |
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1607 T* const l = (T*)(low); \ |
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1608 T* const h = (T*)(high); \ |
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1609 assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 && \ |
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1610 mask_bits((intptr_t)h, sizeof(T)-1) == 0, \ |
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1611 "bounded region must be properly aligned"); \ |
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1612 T* p = (T*)(start_p); \ |
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1613 T* end = p + (count); \ |
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1614 if (p < l) p = l; \ |
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1615 if (end > h) end = h; \ |
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1616 while (p < end) { \ |
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1617 (assert_fn)(p); \ |
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1618 do_oop; \ |
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1619 ++p; \ |
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1620 } \ |
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1621 } |
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1622 |
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1623 |
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1624 // The following macros call specialized macros, passing either oop or |
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1625 // narrowOop as the specialization type. These test the UseCompressedOops |
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1626 // flag. |
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1627 #define InstanceKlass_OOP_MAP_ITERATE(obj, do_oop, assert_fn) \ |
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1628 { \ |
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1629 /* Compute oopmap block range. The common case \ |
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1630 is nonstatic_oop_map_size == 1. */ \ |
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1631 OopMapBlock* map = start_of_nonstatic_oop_maps(); \ |
938 | 1632 OopMapBlock* const end_map = map + nonstatic_oop_map_count(); \ |
113
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1633 if (UseCompressedOops) { \ |
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1634 while (map < end_map) { \ |
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1635 InstanceKlass_SPECIALIZED_OOP_ITERATE(narrowOop, \ |
938 | 1636 obj->obj_field_addr<narrowOop>(map->offset()), map->count(), \ |
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1637 do_oop, assert_fn) \ |
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1638 ++map; \ |
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1639 } \ |
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1640 } else { \ |
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1641 while (map < end_map) { \ |
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1642 InstanceKlass_SPECIALIZED_OOP_ITERATE(oop, \ |
938 | 1643 obj->obj_field_addr<oop>(map->offset()), map->count(), \ |
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1644 do_oop, assert_fn) \ |
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1645 ++map; \ |
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1646 } \ |
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1647 } \ |
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1648 } |
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1649 |
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1650 #define InstanceKlass_OOP_MAP_REVERSE_ITERATE(obj, do_oop, assert_fn) \ |
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1651 { \ |
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1652 OopMapBlock* const start_map = start_of_nonstatic_oop_maps(); \ |
938 | 1653 OopMapBlock* map = start_map + nonstatic_oop_map_count(); \ |
113
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1654 if (UseCompressedOops) { \ |
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1655 while (start_map < map) { \ |
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1656 --map; \ |
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1657 InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE(narrowOop, \ |
938 | 1658 obj->obj_field_addr<narrowOop>(map->offset()), map->count(), \ |
113
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1659 do_oop, assert_fn) \ |
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1660 } \ |
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1661 } else { \ |
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1662 while (start_map < map) { \ |
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1663 --map; \ |
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1664 InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE(oop, \ |
938 | 1665 obj->obj_field_addr<oop>(map->offset()), map->count(), \ |
113
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1666 do_oop, assert_fn) \ |
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1667 } \ |
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1668 } \ |
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1669 } |
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1670 |
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1671 #define InstanceKlass_BOUNDED_OOP_MAP_ITERATE(obj, low, high, do_oop, \ |
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1672 assert_fn) \ |
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1673 { \ |
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1674 /* Compute oopmap block range. The common case is \ |
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1675 nonstatic_oop_map_size == 1, so we accept the \ |
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1676 usually non-existent extra overhead of examining \ |
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1677 all the maps. */ \ |
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1678 OopMapBlock* map = start_of_nonstatic_oop_maps(); \ |
938 | 1679 OopMapBlock* const end_map = map + nonstatic_oop_map_count(); \ |
113
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1680 if (UseCompressedOops) { \ |
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1681 while (map < end_map) { \ |
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1682 InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(narrowOop, \ |
938 | 1683 obj->obj_field_addr<narrowOop>(map->offset()), map->count(), \ |
113
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1684 low, high, \ |
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1685 do_oop, assert_fn) \ |
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1686 ++map; \ |
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1687 } \ |
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1688 } else { \ |
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1689 while (map < end_map) { \ |
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1690 InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(oop, \ |
938 | 1691 obj->obj_field_addr<oop>(map->offset()), map->count(), \ |
113
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1692 low, high, \ |
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1693 do_oop, assert_fn) \ |
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1694 ++map; \ |
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1695 } \ |
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1696 } \ |
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1697 } |
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1698 |
0 | 1699 void instanceKlass::oop_follow_contents(oop obj) { |
113
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1700 assert(obj != NULL, "can't follow the content of NULL object"); |
0 | 1701 obj->follow_header(); |
113
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1702 InstanceKlass_OOP_MAP_ITERATE( \ |
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1703 obj, \ |
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1704 MarkSweep::mark_and_push(p), \ |
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1705 assert_is_in_closed_subset) |
0 | 1706 } |
1707 | |
1708 #ifndef SERIALGC | |
1709 void instanceKlass::oop_follow_contents(ParCompactionManager* cm, | |
1710 oop obj) { | |
113
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1711 assert(obj != NULL, "can't follow the content of NULL object"); |
0 | 1712 obj->follow_header(cm); |
113
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1713 InstanceKlass_OOP_MAP_ITERATE( \ |
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1714 obj, \ |
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1715 PSParallelCompact::mark_and_push(cm, p), \ |
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1716 assert_is_in) |
0 | 1717 } |
1718 #endif // SERIALGC | |
1719 | |
1720 // closure's do_header() method dicates whether the given closure should be | |
1721 // applied to the klass ptr in the object header. | |
1722 | |
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1723 #define InstanceKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ |
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1724 \ |
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1725 int instanceKlass::oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \ |
113
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1726 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik);\ |
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1727 /* header */ \ |
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1728 if (closure->do_header()) { \ |
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1729 obj->oop_iterate_header(closure); \ |
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1730 } \ |
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1731 InstanceKlass_OOP_MAP_ITERATE( \ |
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1732 obj, \ |
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1733 SpecializationStats:: \ |
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1734 record_do_oop_call##nv_suffix(SpecializationStats::ik); \ |
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1735 (closure)->do_oop##nv_suffix(p), \ |
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1736 assert_is_in_closed_subset) \ |
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1737 return size_helper(); \ |
0 | 1738 } |
1739 | |
342
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1740 #ifndef SERIALGC |
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1741 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \ |
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1742 \ |
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1743 int instanceKlass::oop_oop_iterate_backwards##nv_suffix(oop obj, \ |
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1744 OopClosureType* closure) { \ |
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1745 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik); \ |
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1746 /* header */ \ |
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1747 if (closure->do_header()) { \ |
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1748 obj->oop_iterate_header(closure); \ |
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1749 } \ |
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1750 /* instance variables */ \ |
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1751 InstanceKlass_OOP_MAP_REVERSE_ITERATE( \ |
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1752 obj, \ |
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1753 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::ik);\ |
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1754 (closure)->do_oop##nv_suffix(p), \ |
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1755 assert_is_in_closed_subset) \ |
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1756 return size_helper(); \ |
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1757 } |
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1758 #endif // !SERIALGC |
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1759 |
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1760 #define InstanceKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \ |
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1761 \ |
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1762 int instanceKlass::oop_oop_iterate##nv_suffix##_m(oop obj, \ |
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1763 OopClosureType* closure, \ |
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1764 MemRegion mr) { \ |
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1765 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik);\ |
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1766 if (closure->do_header()) { \ |
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1767 obj->oop_iterate_header(closure, mr); \ |
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1768 } \ |
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1769 InstanceKlass_BOUNDED_OOP_MAP_ITERATE( \ |
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1770 obj, mr.start(), mr.end(), \ |
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1771 (closure)->do_oop##nv_suffix(p), \ |
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1772 assert_is_in_closed_subset) \ |
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1773 return size_helper(); \ |
0 | 1774 } |
1775 | |
1776 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DEFN) | |
342
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1777 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DEFN) |
0 | 1778 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DEFN_m) |
342
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1779 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DEFN_m) |
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1780 #ifndef SERIALGC |
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1781 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN) |
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1782 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN) |
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1783 #endif // !SERIALGC |
0 | 1784 |
1785 int instanceKlass::oop_adjust_pointers(oop obj) { | |
1786 int size = size_helper(); | |
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1787 InstanceKlass_OOP_MAP_ITERATE( \ |
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1788 obj, \ |
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1789 MarkSweep::adjust_pointer(p), \ |
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1790 assert_is_in) |
0 | 1791 obj->adjust_header(); |
1792 return size; | |
1793 } | |
1794 | |
1795 #ifndef SERIALGC | |
1796 void instanceKlass::oop_push_contents(PSPromotionManager* pm, oop obj) { | |
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1797 InstanceKlass_OOP_MAP_REVERSE_ITERATE( \ |
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1798 obj, \ |
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1799 if (PSScavenge::should_scavenge(p)) { \ |
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1800 pm->claim_or_forward_depth(p); \ |
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1801 }, \ |
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1802 assert_nothing ) |
0 | 1803 } |
1804 | |
1805 int instanceKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) { | |
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1806 InstanceKlass_OOP_MAP_ITERATE( \ |
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1807 obj, \ |
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1808 PSParallelCompact::adjust_pointer(p), \ |
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1809 assert_nothing) |
0 | 1810 return size_helper(); |
1811 } | |
1812 | |
1813 #endif // SERIALGC | |
1814 | |
1815 // This klass is alive but the implementor link is not followed/updated. | |
1816 // Subklass and sibling links are handled by Klass::follow_weak_klass_links | |
1817 | |
1818 void instanceKlass::follow_weak_klass_links( | |
1819 BoolObjectClosure* is_alive, OopClosure* keep_alive) { | |
1820 assert(is_alive->do_object_b(as_klassOop()), "this oop should be live"); | |
1821 if (ClassUnloading) { | |
1822 for (int i = 0; i < implementors_limit; i++) { | |
1823 klassOop impl = _implementors[i]; | |
1824 if (impl == NULL) break; // no more in the list | |
1825 if (!is_alive->do_object_b(impl)) { | |
1826 // remove this guy from the list by overwriting him with the tail | |
1827 int lasti = --_nof_implementors; | |
1828 assert(lasti >= i && lasti < implementors_limit, "just checking"); | |
1829 _implementors[i] = _implementors[lasti]; | |
1830 _implementors[lasti] = NULL; | |
1831 --i; // rerun the loop at this index | |
1832 } | |
1833 } | |
1834 } else { | |
1835 for (int i = 0; i < implementors_limit; i++) { | |
1836 keep_alive->do_oop(&adr_implementors()[i]); | |
1837 } | |
1838 } | |
1839 Klass::follow_weak_klass_links(is_alive, keep_alive); | |
1840 } | |
1841 | |
1842 void instanceKlass::remove_unshareable_info() { | |
1843 Klass::remove_unshareable_info(); | |
1844 init_implementor(); | |
1845 } | |
1846 | |
1847 static void clear_all_breakpoints(methodOop m) { | |
1848 m->clear_all_breakpoints(); | |
1849 } | |
1850 | |
1851 void instanceKlass::release_C_heap_structures() { | |
1852 // Deallocate oop map cache | |
1853 if (_oop_map_cache != NULL) { | |
1854 delete _oop_map_cache; | |
1855 _oop_map_cache = NULL; | |
1856 } | |
1857 | |
1858 // Deallocate JNI identifiers for jfieldIDs | |
1859 JNIid::deallocate(jni_ids()); | |
1860 set_jni_ids(NULL); | |
1861 | |
1862 jmethodID* jmeths = methods_jmethod_ids_acquire(); | |
1863 if (jmeths != (jmethodID*)NULL) { | |
1864 release_set_methods_jmethod_ids(NULL); | |
1865 FreeHeap(jmeths); | |
1866 } | |
1867 | |
1868 int* indices = methods_cached_itable_indices_acquire(); | |
1869 if (indices != (int*)NULL) { | |
1870 release_set_methods_cached_itable_indices(NULL); | |
1871 FreeHeap(indices); | |
1872 } | |
1873 | |
1874 // release dependencies | |
1875 nmethodBucket* b = _dependencies; | |
1876 _dependencies = NULL; | |
1877 while (b != NULL) { | |
1878 nmethodBucket* next = b->next(); | |
1879 delete b; | |
1880 b = next; | |
1881 } | |
1882 | |
1883 // Deallocate breakpoint records | |
1884 if (breakpoints() != 0x0) { | |
1885 methods_do(clear_all_breakpoints); | |
1886 assert(breakpoints() == 0x0, "should have cleared breakpoints"); | |
1887 } | |
1888 | |
1889 // deallocate information about previous versions | |
1890 if (_previous_versions != NULL) { | |
1891 for (int i = _previous_versions->length() - 1; i >= 0; i--) { | |
1892 PreviousVersionNode * pv_node = _previous_versions->at(i); | |
1893 delete pv_node; | |
1894 } | |
1895 delete _previous_versions; | |
1896 _previous_versions = NULL; | |
1897 } | |
1898 | |
1899 // deallocate the cached class file | |
1900 if (_cached_class_file_bytes != NULL) { | |
1901 os::free(_cached_class_file_bytes); | |
1902 _cached_class_file_bytes = NULL; | |
1903 _cached_class_file_len = 0; | |
1904 } | |
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1905 |
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1906 // Decrement symbol reference counts associated with the unloaded class. |
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1907 if (_name != NULL) _name->decrement_refcount(); |
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1908 // unreference array name derived from this class name (arrays of an unloaded |
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1909 // class can't be referenced anymore). |
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1910 if (_array_name != NULL) _array_name->decrement_refcount(); |
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1911 if (_source_file_name != NULL) _source_file_name->decrement_refcount(); |
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1912 if (_source_debug_extension != NULL) _source_debug_extension->decrement_refcount(); |
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1913 // walk constant pool and decrement symbol reference counts |
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1914 _constants->unreference_symbols(); |
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1915 } |
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1916 |
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1917 void instanceKlass::set_source_file_name(Symbol* n) { |
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1918 _source_file_name = n; |
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1919 if (_source_file_name != NULL) _source_file_name->increment_refcount(); |
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1920 } |
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1921 |
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1922 void instanceKlass::set_source_debug_extension(Symbol* n) { |
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1923 _source_debug_extension = n; |
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1924 if (_source_debug_extension != NULL) _source_debug_extension->increment_refcount(); |
0 | 1925 } |
1926 | |
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1927 address instanceKlass::static_field_addr(int offset) { |
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1928 return (address)(offset + instanceMirrorKlass::offset_of_static_fields() + (intptr_t)java_mirror()); |
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1929 } |
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1930 |
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1931 |
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1932 const char* instanceKlass::signature_name() const { |
0 | 1933 const char* src = (const char*) (name()->as_C_string()); |
1934 const int src_length = (int)strlen(src); | |
1935 char* dest = NEW_RESOURCE_ARRAY(char, src_length + 3); | |
1936 int src_index = 0; | |
1937 int dest_index = 0; | |
1938 dest[dest_index++] = 'L'; | |
1939 while (src_index < src_length) { | |
1940 dest[dest_index++] = src[src_index++]; | |
1941 } | |
1942 dest[dest_index++] = ';'; | |
1943 dest[dest_index] = '\0'; | |
1944 return dest; | |
1945 } | |
1946 | |
1947 // different verisons of is_same_class_package | |
1948 bool instanceKlass::is_same_class_package(klassOop class2) { | |
1949 klassOop class1 = as_klassOop(); | |
1950 oop classloader1 = instanceKlass::cast(class1)->class_loader(); | |
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1951 Symbol* classname1 = Klass::cast(class1)->name(); |
0 | 1952 |
1953 if (Klass::cast(class2)->oop_is_objArray()) { | |
1954 class2 = objArrayKlass::cast(class2)->bottom_klass(); | |
1955 } | |
1956 oop classloader2; | |
1957 if (Klass::cast(class2)->oop_is_instance()) { | |
1958 classloader2 = instanceKlass::cast(class2)->class_loader(); | |
1959 } else { | |
1960 assert(Klass::cast(class2)->oop_is_typeArray(), "should be type array"); | |
1961 classloader2 = NULL; | |
1962 } | |
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1963 Symbol* classname2 = Klass::cast(class2)->name(); |
0 | 1964 |
1965 return instanceKlass::is_same_class_package(classloader1, classname1, | |
1966 classloader2, classname2); | |
1967 } | |
1968 | |
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1969 bool instanceKlass::is_same_class_package(oop classloader2, Symbol* classname2) { |
0 | 1970 klassOop class1 = as_klassOop(); |
1971 oop classloader1 = instanceKlass::cast(class1)->class_loader(); | |
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1972 Symbol* classname1 = Klass::cast(class1)->name(); |
0 | 1973 |
1974 return instanceKlass::is_same_class_package(classloader1, classname1, | |
1975 classloader2, classname2); | |
1976 } | |
1977 | |
1978 // return true if two classes are in the same package, classloader | |
1979 // and classname information is enough to determine a class's package | |
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1980 bool instanceKlass::is_same_class_package(oop class_loader1, Symbol* class_name1, |
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1981 oop class_loader2, Symbol* class_name2) { |
0 | 1982 if (class_loader1 != class_loader2) { |
1983 return false; | |
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1984 } else if (class_name1 == class_name2) { |
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1985 return true; // skip painful bytewise comparison |
0 | 1986 } else { |
1987 ResourceMark rm; | |
1988 | |
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1989 // The Symbol*'s are in UTF8 encoding. Since we only need to check explicitly |
0 | 1990 // for ASCII characters ('/', 'L', '['), we can keep them in UTF8 encoding. |
1991 // Otherwise, we just compare jbyte values between the strings. | |
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1992 const jbyte *name1 = class_name1->base(); |
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1993 const jbyte *name2 = class_name2->base(); |
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1994 |
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1995 const jbyte *last_slash1 = UTF8::strrchr(name1, class_name1->utf8_length(), '/'); |
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1996 const jbyte *last_slash2 = UTF8::strrchr(name2, class_name2->utf8_length(), '/'); |
0 | 1997 |
1998 if ((last_slash1 == NULL) || (last_slash2 == NULL)) { | |
1999 // One of the two doesn't have a package. Only return true | |
2000 // if the other one also doesn't have a package. | |
2001 return last_slash1 == last_slash2; | |
2002 } else { | |
2003 // Skip over '['s | |
2004 if (*name1 == '[') { | |
2005 do { | |
2006 name1++; | |
2007 } while (*name1 == '['); | |
2008 if (*name1 != 'L') { | |
2009 // Something is terribly wrong. Shouldn't be here. | |
2010 return false; | |
2011 } | |
2012 } | |
2013 if (*name2 == '[') { | |
2014 do { | |
2015 name2++; | |
2016 } while (*name2 == '['); | |
2017 if (*name2 != 'L') { | |
2018 // Something is terribly wrong. Shouldn't be here. | |
2019 return false; | |
2020 } | |
2021 } | |
2022 | |
2023 // Check that package part is identical | |
2024 int length1 = last_slash1 - name1; | |
2025 int length2 = last_slash2 - name2; | |
2026 | |
2027 return UTF8::equal(name1, length1, name2, length2); | |
2028 } | |
2029 } | |
2030 } | |
2031 | |
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2032 // Returns true iff super_method can be overridden by a method in targetclassname |
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2033 // See JSL 3rd edition 8.4.6.1 |
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2034 // Assumes name-signature match |
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2035 // "this" is instanceKlass of super_method which must exist |
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2036 // note that the instanceKlass of the method in the targetclassname has not always been created yet |
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2037 bool instanceKlass::is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) { |
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2038 // Private methods can not be overridden |
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2039 if (super_method->is_private()) { |
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2040 return false; |
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2041 } |
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2042 // If super method is accessible, then override |
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2043 if ((super_method->is_protected()) || |
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2044 (super_method->is_public())) { |
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2045 return true; |
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2046 } |
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2047 // Package-private methods are not inherited outside of package |
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2048 assert(super_method->is_package_private(), "must be package private"); |
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2049 return(is_same_class_package(targetclassloader(), targetclassname)); |
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2050 } |
0 | 2051 |
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2052 /* defined for now in jvm.cpp, for historical reasons *-- |
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2053 klassOop instanceKlass::compute_enclosing_class_impl(instanceKlassHandle self, |
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2054 Symbol*& simple_name_result, TRAPS) { |
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2055 ... |
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2056 } |
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2057 */ |
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2058 |
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2059 // tell if two classes have the same enclosing class (at package level) |
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2060 bool instanceKlass::is_same_package_member_impl(instanceKlassHandle class1, |
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2061 klassOop class2_oop, TRAPS) { |
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2062 if (class2_oop == class1->as_klassOop()) return true; |
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2063 if (!Klass::cast(class2_oop)->oop_is_instance()) return false; |
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2064 instanceKlassHandle class2(THREAD, class2_oop); |
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2065 |
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2066 // must be in same package before we try anything else |
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2067 if (!class1->is_same_class_package(class2->class_loader(), class2->name())) |
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2068 return false; |
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2069 |
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2070 // As long as there is an outer1.getEnclosingClass, |
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2071 // shift the search outward. |
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2072 instanceKlassHandle outer1 = class1; |
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2073 for (;;) { |
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2074 // As we walk along, look for equalities between outer1 and class2. |
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2075 // Eventually, the walks will terminate as outer1 stops |
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2076 // at the top-level class around the original class. |
1126
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2077 bool ignore_inner_is_member; |
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2078 klassOop next = outer1->compute_enclosing_class(&ignore_inner_is_member, |
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2079 CHECK_false); |
665
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2080 if (next == NULL) break; |
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2081 if (next == class2()) return true; |
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2082 outer1 = instanceKlassHandle(THREAD, next); |
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2083 } |
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2084 |
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2085 // Now do the same for class2. |
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2086 instanceKlassHandle outer2 = class2; |
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2087 for (;;) { |
1126
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2088 bool ignore_inner_is_member; |
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2089 klassOop next = outer2->compute_enclosing_class(&ignore_inner_is_member, |
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2090 CHECK_false); |
665
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2091 if (next == NULL) break; |
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2092 // Might as well check the new outer against all available values. |
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2093 if (next == class1()) return true; |
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2094 if (next == outer1()) return true; |
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2095 outer2 = instanceKlassHandle(THREAD, next); |
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2096 } |
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2097 |
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2098 // If by this point we have not found an equality between the |
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2099 // two classes, we know they are in separate package members. |
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2100 return false; |
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2101 } |
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2102 |
0 | 2103 |
2104 jint instanceKlass::compute_modifier_flags(TRAPS) const { | |
2105 klassOop k = as_klassOop(); | |
2106 jint access = access_flags().as_int(); | |
2107 | |
2108 // But check if it happens to be member class. | |
2109 typeArrayOop inner_class_list = inner_classes(); | |
2110 int length = (inner_class_list == NULL) ? 0 : inner_class_list->length(); | |
2111 assert (length % instanceKlass::inner_class_next_offset == 0, "just checking"); | |
2112 if (length > 0) { | |
2113 typeArrayHandle inner_class_list_h(THREAD, inner_class_list); | |
2114 instanceKlassHandle ik(THREAD, k); | |
2115 for (int i = 0; i < length; i += instanceKlass::inner_class_next_offset) { | |
2116 int ioff = inner_class_list_h->ushort_at( | |
2117 i + instanceKlass::inner_class_inner_class_info_offset); | |
2118 | |
2119 // Inner class attribute can be zero, skip it. | |
2120 // Strange but true: JVM spec. allows null inner class refs. | |
2121 if (ioff == 0) continue; | |
2122 | |
2123 // only look at classes that are already loaded | |
2124 // since we are looking for the flags for our self. | |
2177
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2125 Symbol* inner_name = ik->constants()->klass_name_at(ioff); |
0 | 2126 if ((ik->name() == inner_name)) { |
2127 // This is really a member class. | |
2128 access = inner_class_list_h->ushort_at(i + instanceKlass::inner_class_access_flags_offset); | |
2129 break; | |
2130 } | |
2131 } | |
2132 } | |
2133 // Remember to strip ACC_SUPER bit | |
2134 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS; | |
2135 } | |
2136 | |
2137 jint instanceKlass::jvmti_class_status() const { | |
2138 jint result = 0; | |
2139 | |
2140 if (is_linked()) { | |
2141 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED; | |
2142 } | |
2143 | |
2144 if (is_initialized()) { | |
2145 assert(is_linked(), "Class status is not consistent"); | |
2146 result |= JVMTI_CLASS_STATUS_INITIALIZED; | |
2147 } | |
2148 if (is_in_error_state()) { | |
2149 result |= JVMTI_CLASS_STATUS_ERROR; | |
2150 } | |
2151 return result; | |
2152 } | |
2153 | |
2154 methodOop instanceKlass::method_at_itable(klassOop holder, int index, TRAPS) { | |
2155 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable(); | |
2156 int method_table_offset_in_words = ioe->offset()/wordSize; | |
2157 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words()) | |
2158 / itableOffsetEntry::size(); | |
2159 | |
2160 for (int cnt = 0 ; ; cnt ++, ioe ++) { | |
605 | 2161 // If the interface isn't implemented by the receiver class, |
0 | 2162 // the VM should throw IncompatibleClassChangeError. |
2163 if (cnt >= nof_interfaces) { | |
2177
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2164 THROW_0(vmSymbols::java_lang_IncompatibleClassChangeError()); |
0 | 2165 } |
2166 | |
2167 klassOop ik = ioe->interface_klass(); | |
2168 if (ik == holder) break; | |
2169 } | |
2170 | |
2171 itableMethodEntry* ime = ioe->first_method_entry(as_klassOop()); | |
2172 methodOop m = ime[index].method(); | |
2173 if (m == NULL) { | |
2177
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2174 THROW_0(vmSymbols::java_lang_AbstractMethodError()); |
0 | 2175 } |
2176 return m; | |
2177 } | |
2178 | |
2179 // On-stack replacement stuff | |
2180 void instanceKlass::add_osr_nmethod(nmethod* n) { | |
2181 // only one compilation can be active | |
2182 NEEDS_CLEANUP | |
2183 // This is a short non-blocking critical region, so the no safepoint check is ok. | |
2184 OsrList_lock->lock_without_safepoint_check(); | |
2185 assert(n->is_osr_method(), "wrong kind of nmethod"); | |
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2186 n->set_osr_link(osr_nmethods_head()); |
0 | 2187 set_osr_nmethods_head(n); |
1783 | 2188 // Raise the highest osr level if necessary |
2189 if (TieredCompilation) { | |
2190 methodOop m = n->method(); | |
2191 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level())); | |
2192 } | |
0 | 2193 // Remember to unlock again |
2194 OsrList_lock->unlock(); | |
1783 | 2195 |
2196 // Get rid of the osr methods for the same bci that have lower levels. | |
2197 if (TieredCompilation) { | |
2198 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) { | |
2199 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true); | |
2200 if (inv != NULL && inv->is_in_use()) { | |
2201 inv->make_not_entrant(); | |
2202 } | |
2203 } | |
2204 } | |
0 | 2205 } |
2206 | |
2207 | |
2208 void instanceKlass::remove_osr_nmethod(nmethod* n) { | |
2209 // This is a short non-blocking critical region, so the no safepoint check is ok. | |
2210 OsrList_lock->lock_without_safepoint_check(); | |
2211 assert(n->is_osr_method(), "wrong kind of nmethod"); | |
2212 nmethod* last = NULL; | |
2213 nmethod* cur = osr_nmethods_head(); | |
1783 | 2214 int max_level = CompLevel_none; // Find the max comp level excluding n |
2215 methodOop m = n->method(); | |
0 | 2216 // Search for match |
2217 while(cur != NULL && cur != n) { | |
1783 | 2218 if (TieredCompilation) { |
2219 // Find max level before n | |
2220 max_level = MAX2(max_level, cur->comp_level()); | |
2221 } | |
0 | 2222 last = cur; |
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2223 cur = cur->osr_link(); |
0 | 2224 } |
1783 | 2225 nmethod* next = NULL; |
0 | 2226 if (cur == n) { |
1783 | 2227 next = cur->osr_link(); |
0 | 2228 if (last == NULL) { |
2229 // Remove first element | |
1783 | 2230 set_osr_nmethods_head(next); |
0 | 2231 } else { |
1783 | 2232 last->set_osr_link(next); |
0 | 2233 } |
2234 } | |
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2235 n->set_osr_link(NULL); |
1783 | 2236 if (TieredCompilation) { |
2237 cur = next; | |
2238 while (cur != NULL) { | |
2239 // Find max level after n | |
2240 max_level = MAX2(max_level, cur->comp_level()); | |
2241 cur = cur->osr_link(); | |
2242 } | |
2243 m->set_highest_osr_comp_level(max_level); | |
2244 } | |
0 | 2245 // Remember to unlock again |
2246 OsrList_lock->unlock(); | |
2247 } | |
2248 | |
1783 | 2249 nmethod* instanceKlass::lookup_osr_nmethod(const methodOop m, int bci, int comp_level, bool match_level) const { |
0 | 2250 // This is a short non-blocking critical region, so the no safepoint check is ok. |
2251 OsrList_lock->lock_without_safepoint_check(); | |
2252 nmethod* osr = osr_nmethods_head(); | |
1783 | 2253 nmethod* best = NULL; |
0 | 2254 while (osr != NULL) { |
2255 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain"); | |
1783 | 2256 // There can be a time when a c1 osr method exists but we are waiting |
2257 // for a c2 version. When c2 completes its osr nmethod we will trash | |
2258 // the c1 version and only be able to find the c2 version. However | |
2259 // while we overflow in the c1 code at back branches we don't want to | |
2260 // try and switch to the same code as we are already running | |
2261 | |
0 | 2262 if (osr->method() == m && |
2263 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) { | |
1783 | 2264 if (match_level) { |
2265 if (osr->comp_level() == comp_level) { | |
2266 // Found a match - return it. | |
2267 OsrList_lock->unlock(); | |
2268 return osr; | |
2269 } | |
2270 } else { | |
2271 if (best == NULL || (osr->comp_level() > best->comp_level())) { | |
2272 if (osr->comp_level() == CompLevel_highest_tier) { | |
2273 // Found the best possible - return it. | |
2274 OsrList_lock->unlock(); | |
2275 return osr; | |
2276 } | |
2277 best = osr; | |
2278 } | |
2279 } | |
0 | 2280 } |
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2281 osr = osr->osr_link(); |
0 | 2282 } |
2283 OsrList_lock->unlock(); | |
1783 | 2284 if (best != NULL && best->comp_level() >= comp_level && match_level == false) { |
2285 return best; | |
2286 } | |
0 | 2287 return NULL; |
2288 } | |
2289 | |
2290 // ----------------------------------------------------------------------------------------------------- | |
2291 #ifndef PRODUCT | |
2292 | |
2293 // Printing | |
2294 | |
665
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2295 #define BULLET " - " |
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2296 |
0 | 2297 void FieldPrinter::do_field(fieldDescriptor* fd) { |
665
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2298 _st->print(BULLET); |
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2299 if (_obj == NULL) { |
0 | 2300 fd->print_on(_st); |
2301 _st->cr(); | |
2302 } else { | |
2303 fd->print_on_for(_st, _obj); | |
2304 _st->cr(); | |
2305 } | |
2306 } | |
2307 | |
2308 | |
2309 void instanceKlass::oop_print_on(oop obj, outputStream* st) { | |
2310 Klass::oop_print_on(obj, st); | |
2311 | |
1142 | 2312 if (as_klassOop() == SystemDictionary::String_klass()) { |
0 | 2313 typeArrayOop value = java_lang_String::value(obj); |
2314 juint offset = java_lang_String::offset(obj); | |
2315 juint length = java_lang_String::length(obj); | |
2316 if (value != NULL && | |
2317 value->is_typeArray() && | |
2318 offset <= (juint) value->length() && | |
2319 offset + length <= (juint) value->length()) { | |
665
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2320 st->print(BULLET"string: "); |
0 | 2321 Handle h_obj(obj); |
2322 java_lang_String::print(h_obj, st); | |
2323 st->cr(); | |
2324 if (!WizardMode) return; // that is enough | |
2325 } | |
2326 } | |
2327 | |
665
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2328 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj)); |
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2329 FieldPrinter print_field(st, obj); |
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2330 do_nonstatic_fields(&print_field); |
0 | 2331 |
1142 | 2332 if (as_klassOop() == SystemDictionary::Class_klass()) { |
665
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2333 st->print(BULLET"signature: "); |
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2334 java_lang_Class::print_signature(obj, st); |
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2335 st->cr(); |
0 | 2336 klassOop mirrored_klass = java_lang_Class::as_klassOop(obj); |
665
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2337 st->print(BULLET"fake entry for mirror: "); |
0 | 2338 mirrored_klass->print_value_on(st); |
2339 st->cr(); | |
665
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2340 st->print(BULLET"fake entry resolved_constructor: "); |
0 | 2341 methodOop ctor = java_lang_Class::resolved_constructor(obj); |
2342 ctor->print_value_on(st); | |
2343 klassOop array_klass = java_lang_Class::array_klass(obj); | |
665
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2344 st->cr(); |
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2345 st->print(BULLET"fake entry for array: "); |
0 | 2346 array_klass->print_value_on(st); |
2347 st->cr(); | |
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|
2348 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj)); |
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2349 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj)); |
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2350 klassOop real_klass = java_lang_Class::as_klassOop(obj); |
2408
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2351 if (real_klass != NULL && real_klass->klass_part()->oop_is_instance()) { |
2376
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2352 instanceKlass::cast(real_klass)->do_local_static_fields(&print_field); |
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|
2353 } |
1039
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|
2354 } else if (as_klassOop() == SystemDictionary::MethodType_klass()) { |
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2355 st->print(BULLET"signature: "); |
2357
8033953d67ff
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|
2356 java_lang_invoke_MethodType::print_signature(obj, st); |
1039
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2357 st->cr(); |
0 | 2358 } |
2359 } | |
2360 | |
1155
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|
2361 #endif //PRODUCT |
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|
2362 |
0 | 2363 void instanceKlass::oop_print_value_on(oop obj, outputStream* st) { |
2364 st->print("a "); | |
2365 name()->print_value_on(st); | |
2366 obj->print_address_on(st); | |
1142 | 2367 if (as_klassOop() == SystemDictionary::String_klass() |
665
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2368 && java_lang_String::value(obj) != NULL) { |
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|
2369 ResourceMark rm; |
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|
2370 int len = java_lang_String::length(obj); |
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|
2371 int plen = (len < 24 ? len : 12); |
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|
2372 char* str = java_lang_String::as_utf8_string(obj, 0, plen); |
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2373 st->print(" = \"%s\"", str); |
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|
2374 if (len > plen) |
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|
2375 st->print("...[%d]", len); |
1142 | 2376 } else if (as_klassOop() == SystemDictionary::Class_klass()) { |
665
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|
2377 klassOop k = java_lang_Class::as_klassOop(obj); |
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|
2378 st->print(" = "); |
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|
2379 if (k != NULL) { |
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|
2380 k->print_value_on(st); |
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|
2381 } else { |
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|
2382 const char* tname = type2name(java_lang_Class::primitive_type(obj)); |
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2383 st->print("%s", tname ? tname : "type?"); |
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|
2384 } |
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2385 } else if (as_klassOop() == SystemDictionary::MethodType_klass()) { |
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|
2386 st->print(" = "); |
2357
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|
2387 java_lang_invoke_MethodType::print_signature(obj, st); |
665
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2388 } else if (java_lang_boxing_object::is_instance(obj)) { |
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|
2389 st->print(" = "); |
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|
2390 java_lang_boxing_object::print(obj, st); |
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2391 } |
0 | 2392 } |
2393 | |
2394 const char* instanceKlass::internal_name() const { | |
2395 return external_name(); | |
2396 } | |
2397 | |
2398 // Verification | |
2399 | |
2400 class VerifyFieldClosure: public OopClosure { | |
113
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2401 protected: |
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2402 template <class T> void do_oop_work(T* p) { |
0 | 2403 guarantee(Universe::heap()->is_in_closed_subset(p), "should be in heap"); |
113
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2404 oop obj = oopDesc::load_decode_heap_oop(p); |
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2405 if (!obj->is_oop_or_null()) { |
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|
2406 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p, (address)obj); |
0 | 2407 Universe::print(); |
2408 guarantee(false, "boom"); | |
2409 } | |
2410 } | |
113
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2411 public: |
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2412 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); } |
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2413 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); } |
0 | 2414 }; |
2415 | |
2416 void instanceKlass::oop_verify_on(oop obj, outputStream* st) { | |
2417 Klass::oop_verify_on(obj, st); | |
2418 VerifyFieldClosure blk; | |
2419 oop_oop_iterate(obj, &blk); | |
2420 } | |
2421 | |
113
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2422 // JNIid class for jfieldIDs only |
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2423 // Note to reviewers: |
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2424 // These JNI functions are just moved over to column 1 and not changed |
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2425 // in the compressed oops workspace. |
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2426 JNIid::JNIid(klassOop holder, int offset, JNIid* next) { |
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2427 _holder = holder; |
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2428 _offset = offset; |
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2429 _next = next; |
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2430 debug_only(_is_static_field_id = false;) |
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2431 } |
0 | 2432 |
2433 | |
113
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2434 JNIid* JNIid::find(int offset) { |
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|
2435 JNIid* current = this; |
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2436 while (current != NULL) { |
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2437 if (current->offset() == offset) return current; |
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2438 current = current->next(); |
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|
2439 } |
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|
2440 return NULL; |
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|
2441 } |
0 | 2442 |
2443 void JNIid::oops_do(OopClosure* f) { | |
2444 for (JNIid* cur = this; cur != NULL; cur = cur->next()) { | |
2445 f->do_oop(cur->holder_addr()); | |
2446 } | |
2447 } | |
2448 | |
2449 void JNIid::deallocate(JNIid* current) { | |
113
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2450 while (current != NULL) { |
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|
2451 JNIid* next = current->next(); |
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diff
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|
2452 delete current; |
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|
2453 current = next; |
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|
2454 } |
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|
2455 } |
0 | 2456 |
2457 | |
113
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|
2458 void JNIid::verify(klassOop holder) { |
2376
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|
2459 int first_field_offset = instanceMirrorKlass::offset_of_static_fields(); |
113
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|
2460 int end_field_offset; |
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|
2461 end_field_offset = first_field_offset + (instanceKlass::cast(holder)->static_field_size() * wordSize); |
0 | 2462 |
113
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2463 JNIid* current = this; |
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2464 while (current != NULL) { |
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|
2465 guarantee(current->holder() == holder, "Invalid klass in JNIid"); |
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|
2466 #ifdef ASSERT |
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|
2467 int o = current->offset(); |
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2468 if (current->is_static_field_id()) { |
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|
2469 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid"); |
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|
2470 } |
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|
2471 #endif |
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|
2472 current = current->next(); |
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|
2473 } |
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|
2474 } |
0 | 2475 |
2476 | |
2477 #ifdef ASSERT | |
113
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|
2478 void instanceKlass::set_init_state(ClassState state) { |
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|
2479 bool good_state = as_klassOop()->is_shared() ? (_init_state <= state) |
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2480 : (_init_state < state); |
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|
2481 assert(good_state || state == allocated, "illegal state transition"); |
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|
2482 _init_state = state; |
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|
2483 } |
0 | 2484 #endif |
2485 | |
2486 | |
2487 // RedefineClasses() support for previous versions: | |
2488 | |
2489 // Add an information node that contains weak references to the | |
2490 // interesting parts of the previous version of the_class. | |
977
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|
2491 // This is also where we clean out any unused weak references. |
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|
2492 // Note that while we delete nodes from the _previous_versions |
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|
2493 // array, we never delete the array itself until the klass is |
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|
2494 // unloaded. The has_been_redefined() query depends on that fact. |
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|
2495 // |
0 | 2496 void instanceKlass::add_previous_version(instanceKlassHandle ikh, |
113
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|
2497 BitMap* emcp_methods, int emcp_method_count) { |
0 | 2498 assert(Thread::current()->is_VM_thread(), |
113
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|
2499 "only VMThread can add previous versions"); |
0 | 2500 |
2501 if (_previous_versions == NULL) { | |
2502 // This is the first previous version so make some space. | |
2503 // Start with 2 elements under the assumption that the class | |
2504 // won't be redefined much. | |
2505 _previous_versions = new (ResourceObj::C_HEAP) | |
2506 GrowableArray<PreviousVersionNode *>(2, true); | |
2507 } | |
2508 | |
2509 // RC_TRACE macro has an embedded ResourceMark | |
2510 RC_TRACE(0x00000100, ("adding previous version ref for %s @%d, EMCP_cnt=%d", | |
2511 ikh->external_name(), _previous_versions->length(), emcp_method_count)); | |
2512 constantPoolHandle cp_h(ikh->constants()); | |
47
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|
2513 jobject cp_ref; |
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|
2514 if (cp_h->is_shared()) { |
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diff
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|
2515 // a shared ConstantPool requires a regular reference; a weak |
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|
2516 // reference would be collectible |
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|
2517 cp_ref = JNIHandles::make_global(cp_h); |
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|
2518 } else { |
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|
2519 cp_ref = JNIHandles::make_weak_global(cp_h); |
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|
2520 } |
0 | 2521 PreviousVersionNode * pv_node = NULL; |
2522 objArrayOop old_methods = ikh->methods(); | |
2523 | |
2524 if (emcp_method_count == 0) { | |
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2525 // non-shared ConstantPool gets a weak reference |
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2526 pv_node = new PreviousVersionNode(cp_ref, !cp_h->is_shared(), NULL); |
0 | 2527 RC_TRACE(0x00000400, |
2528 ("add: all methods are obsolete; flushing any EMCP weak refs")); | |
2529 } else { | |
2530 int local_count = 0; | |
2531 GrowableArray<jweak>* method_refs = new (ResourceObj::C_HEAP) | |
2532 GrowableArray<jweak>(emcp_method_count, true); | |
2533 for (int i = 0; i < old_methods->length(); i++) { | |
2534 if (emcp_methods->at(i)) { | |
2535 // this old method is EMCP so save a weak ref | |
2536 methodOop old_method = (methodOop) old_methods->obj_at(i); | |
2537 methodHandle old_method_h(old_method); | |
2538 jweak method_ref = JNIHandles::make_weak_global(old_method_h); | |
2539 method_refs->append(method_ref); | |
2540 if (++local_count >= emcp_method_count) { | |
2541 // no more EMCP methods so bail out now | |
2542 break; | |
2543 } | |
2544 } | |
2545 } | |
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2546 // non-shared ConstantPool gets a weak reference |
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2547 pv_node = new PreviousVersionNode(cp_ref, !cp_h->is_shared(), method_refs); |
0 | 2548 } |
2549 | |
2550 _previous_versions->append(pv_node); | |
2551 | |
2552 // Using weak references allows the interesting parts of previous | |
2553 // classes to be GC'ed when they are no longer needed. Since the | |
2554 // caller is the VMThread and we are at a safepoint, this is a good | |
2555 // time to clear out unused weak references. | |
2556 | |
2557 RC_TRACE(0x00000400, ("add: previous version length=%d", | |
2558 _previous_versions->length())); | |
2559 | |
2560 // skip the last entry since we just added it | |
2561 for (int i = _previous_versions->length() - 2; i >= 0; i--) { | |
2562 // check the previous versions array for a GC'ed weak refs | |
2563 pv_node = _previous_versions->at(i); | |
2564 cp_ref = pv_node->prev_constant_pool(); | |
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2565 assert(cp_ref != NULL, "cp ref was unexpectedly cleared"); |
0 | 2566 if (cp_ref == NULL) { |
2567 delete pv_node; | |
2568 _previous_versions->remove_at(i); | |
2569 // Since we are traversing the array backwards, we don't have to | |
2570 // do anything special with the index. | |
2571 continue; // robustness | |
2572 } | |
2573 | |
2574 constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); | |
2575 if (cp == NULL) { | |
2576 // this entry has been GC'ed so remove it | |
2577 delete pv_node; | |
2578 _previous_versions->remove_at(i); | |
2579 // Since we are traversing the array backwards, we don't have to | |
2580 // do anything special with the index. | |
2581 continue; | |
2582 } else { | |
2583 RC_TRACE(0x00000400, ("add: previous version @%d is alive", i)); | |
2584 } | |
2585 | |
2586 GrowableArray<jweak>* method_refs = pv_node->prev_EMCP_methods(); | |
2587 if (method_refs != NULL) { | |
2588 RC_TRACE(0x00000400, ("add: previous methods length=%d", | |
2589 method_refs->length())); | |
2590 for (int j = method_refs->length() - 1; j >= 0; j--) { | |
2591 jweak method_ref = method_refs->at(j); | |
2592 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); | |
2593 if (method_ref == NULL) { | |
2594 method_refs->remove_at(j); | |
2595 // Since we are traversing the array backwards, we don't have to | |
2596 // do anything special with the index. | |
2597 continue; // robustness | |
2598 } | |
2599 | |
2600 methodOop method = (methodOop)JNIHandles::resolve(method_ref); | |
2601 if (method == NULL || emcp_method_count == 0) { | |
2602 // This method entry has been GC'ed or the current | |
2603 // RedefineClasses() call has made all methods obsolete | |
2604 // so remove it. | |
2605 JNIHandles::destroy_weak_global(method_ref); | |
2606 method_refs->remove_at(j); | |
2607 } else { | |
2608 // RC_TRACE macro has an embedded ResourceMark | |
2609 RC_TRACE(0x00000400, | |
2610 ("add: %s(%s): previous method @%d in version @%d is alive", | |
2611 method->name()->as_C_string(), method->signature()->as_C_string(), | |
2612 j, i)); | |
2613 } | |
2614 } | |
2615 } | |
2616 } | |
2617 | |
2618 int obsolete_method_count = old_methods->length() - emcp_method_count; | |
2619 | |
2620 if (emcp_method_count != 0 && obsolete_method_count != 0 && | |
2621 _previous_versions->length() > 1) { | |
2622 // We have a mix of obsolete and EMCP methods. If there is more | |
2623 // than the previous version that we just added, then we have to | |
2624 // clear out any matching EMCP method entries the hard way. | |
2625 int local_count = 0; | |
2626 for (int i = 0; i < old_methods->length(); i++) { | |
2627 if (!emcp_methods->at(i)) { | |
2628 // only obsolete methods are interesting | |
2629 methodOop old_method = (methodOop) old_methods->obj_at(i); | |
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2630 Symbol* m_name = old_method->name(); |
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2631 Symbol* m_signature = old_method->signature(); |
0 | 2632 |
2633 // skip the last entry since we just added it | |
2634 for (int j = _previous_versions->length() - 2; j >= 0; j--) { | |
2635 // check the previous versions array for a GC'ed weak refs | |
2636 pv_node = _previous_versions->at(j); | |
2637 cp_ref = pv_node->prev_constant_pool(); | |
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2638 assert(cp_ref != NULL, "cp ref was unexpectedly cleared"); |
0 | 2639 if (cp_ref == NULL) { |
2640 delete pv_node; | |
2641 _previous_versions->remove_at(j); | |
2642 // Since we are traversing the array backwards, we don't have to | |
2643 // do anything special with the index. | |
2644 continue; // robustness | |
2645 } | |
2646 | |
2647 constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); | |
2648 if (cp == NULL) { | |
2649 // this entry has been GC'ed so remove it | |
2650 delete pv_node; | |
2651 _previous_versions->remove_at(j); | |
2652 // Since we are traversing the array backwards, we don't have to | |
2653 // do anything special with the index. | |
2654 continue; | |
2655 } | |
2656 | |
2657 GrowableArray<jweak>* method_refs = pv_node->prev_EMCP_methods(); | |
2658 if (method_refs == NULL) { | |
2659 // We have run into a PreviousVersion generation where | |
2660 // all methods were made obsolete during that generation's | |
2661 // RedefineClasses() operation. At the time of that | |
2662 // operation, all EMCP methods were flushed so we don't | |
2663 // have to go back any further. | |
2664 // | |
2665 // A NULL method_refs is different than an empty method_refs. | |
2666 // We cannot infer any optimizations about older generations | |
2667 // from an empty method_refs for the current generation. | |
2668 break; | |
2669 } | |
2670 | |
2671 for (int k = method_refs->length() - 1; k >= 0; k--) { | |
2672 jweak method_ref = method_refs->at(k); | |
2673 assert(method_ref != NULL, | |
2674 "weak method ref was unexpectedly cleared"); | |
2675 if (method_ref == NULL) { | |
2676 method_refs->remove_at(k); | |
2677 // Since we are traversing the array backwards, we don't | |
2678 // have to do anything special with the index. | |
2679 continue; // robustness | |
2680 } | |
2681 | |
2682 methodOop method = (methodOop)JNIHandles::resolve(method_ref); | |
2683 if (method == NULL) { | |
2684 // this method entry has been GC'ed so skip it | |
2685 JNIHandles::destroy_weak_global(method_ref); | |
2686 method_refs->remove_at(k); | |
2687 continue; | |
2688 } | |
2689 | |
2690 if (method->name() == m_name && | |
2691 method->signature() == m_signature) { | |
2692 // The current RedefineClasses() call has made all EMCP | |
2693 // versions of this method obsolete so mark it as obsolete | |
2694 // and remove the weak ref. | |
2695 RC_TRACE(0x00000400, | |
2696 ("add: %s(%s): flush obsolete method @%d in version @%d", | |
2697 m_name->as_C_string(), m_signature->as_C_string(), k, j)); | |
2698 | |
2699 method->set_is_obsolete(); | |
2700 JNIHandles::destroy_weak_global(method_ref); | |
2701 method_refs->remove_at(k); | |
2702 break; | |
2703 } | |
2704 } | |
2705 | |
2706 // The previous loop may not find a matching EMCP method, but | |
2707 // that doesn't mean that we can optimize and not go any | |
2708 // further back in the PreviousVersion generations. The EMCP | |
2709 // method for this generation could have already been GC'ed, | |
2710 // but there still may be an older EMCP method that has not | |
2711 // been GC'ed. | |
2712 } | |
2713 | |
2714 if (++local_count >= obsolete_method_count) { | |
2715 // no more obsolete methods so bail out now | |
2716 break; | |
2717 } | |
2718 } | |
2719 } | |
2720 } | |
2721 } // end add_previous_version() | |
2722 | |
2723 | |
2724 // Determine if instanceKlass has a previous version. | |
2725 bool instanceKlass::has_previous_version() const { | |
2726 if (_previous_versions == NULL) { | |
2727 // no previous versions array so answer is easy | |
2728 return false; | |
2729 } | |
2730 | |
2731 for (int i = _previous_versions->length() - 1; i >= 0; i--) { | |
2732 // Check the previous versions array for an info node that hasn't | |
2733 // been GC'ed | |
2734 PreviousVersionNode * pv_node = _previous_versions->at(i); | |
2735 | |
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2736 jobject cp_ref = pv_node->prev_constant_pool(); |
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2737 assert(cp_ref != NULL, "cp reference was unexpectedly cleared"); |
0 | 2738 if (cp_ref == NULL) { |
2739 continue; // robustness | |
2740 } | |
2741 | |
2742 constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); | |
2743 if (cp != NULL) { | |
2744 // we have at least one previous version | |
2745 return true; | |
2746 } | |
2747 | |
2748 // We don't have to check the method refs. If the constant pool has | |
2749 // been GC'ed then so have the methods. | |
2750 } | |
2751 | |
2752 // all of the underlying nodes' info has been GC'ed | |
2753 return false; | |
2754 } // end has_previous_version() | |
2755 | |
2756 methodOop instanceKlass::method_with_idnum(int idnum) { | |
2757 methodOop m = NULL; | |
2758 if (idnum < methods()->length()) { | |
2759 m = (methodOop) methods()->obj_at(idnum); | |
2760 } | |
2761 if (m == NULL || m->method_idnum() != idnum) { | |
2762 for (int index = 0; index < methods()->length(); ++index) { | |
2763 m = (methodOop) methods()->obj_at(index); | |
2764 if (m->method_idnum() == idnum) { | |
2765 return m; | |
2766 } | |
2767 } | |
2768 } | |
2769 return m; | |
2770 } | |
2771 | |
2772 | |
2773 // Set the annotation at 'idnum' to 'anno'. | |
2774 // We don't want to create or extend the array if 'anno' is NULL, since that is the | |
2775 // default value. However, if the array exists and is long enough, we must set NULL values. | |
2776 void instanceKlass::set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p) { | |
2777 objArrayOop md = *md_p; | |
2778 if (md != NULL && md->length() > idnum) { | |
2779 md->obj_at_put(idnum, anno); | |
2780 } else if (anno != NULL) { | |
2781 // create the array | |
2782 int length = MAX2(idnum+1, (int)_idnum_allocated_count); | |
2783 md = oopFactory::new_system_objArray(length, Thread::current()); | |
2784 if (*md_p != NULL) { | |
2785 // copy the existing entries | |
2786 for (int index = 0; index < (*md_p)->length(); index++) { | |
2787 md->obj_at_put(index, (*md_p)->obj_at(index)); | |
2788 } | |
2789 } | |
2790 set_annotations(md, md_p); | |
2791 md->obj_at_put(idnum, anno); | |
2792 } // if no array and idnum isn't included there is nothing to do | |
2793 } | |
2794 | |
2795 // Construct a PreviousVersionNode entry for the array hung off | |
2796 // the instanceKlass. | |
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2797 PreviousVersionNode::PreviousVersionNode(jobject prev_constant_pool, |
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2798 bool prev_cp_is_weak, GrowableArray<jweak>* prev_EMCP_methods) { |
0 | 2799 |
2800 _prev_constant_pool = prev_constant_pool; | |
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2801 _prev_cp_is_weak = prev_cp_is_weak; |
0 | 2802 _prev_EMCP_methods = prev_EMCP_methods; |
2803 } | |
2804 | |
2805 | |
2806 // Destroy a PreviousVersionNode | |
2807 PreviousVersionNode::~PreviousVersionNode() { | |
2808 if (_prev_constant_pool != NULL) { | |
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2809 if (_prev_cp_is_weak) { |
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2810 JNIHandles::destroy_weak_global(_prev_constant_pool); |
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2811 } else { |
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2812 JNIHandles::destroy_global(_prev_constant_pool); |
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2813 } |
0 | 2814 } |
2815 | |
2816 if (_prev_EMCP_methods != NULL) { | |
2817 for (int i = _prev_EMCP_methods->length() - 1; i >= 0; i--) { | |
2818 jweak method_ref = _prev_EMCP_methods->at(i); | |
2819 if (method_ref != NULL) { | |
2820 JNIHandles::destroy_weak_global(method_ref); | |
2821 } | |
2822 } | |
2823 delete _prev_EMCP_methods; | |
2824 } | |
2825 } | |
2826 | |
2827 | |
2828 // Construct a PreviousVersionInfo entry | |
2829 PreviousVersionInfo::PreviousVersionInfo(PreviousVersionNode *pv_node) { | |
2830 _prev_constant_pool_handle = constantPoolHandle(); // NULL handle | |
2831 _prev_EMCP_method_handles = NULL; | |
2832 | |
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2833 jobject cp_ref = pv_node->prev_constant_pool(); |
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2834 assert(cp_ref != NULL, "constant pool ref was unexpectedly cleared"); |
0 | 2835 if (cp_ref == NULL) { |
2836 return; // robustness | |
2837 } | |
2838 | |
2839 constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); | |
2840 if (cp == NULL) { | |
2841 // Weak reference has been GC'ed. Since the constant pool has been | |
2842 // GC'ed, the methods have also been GC'ed. | |
2843 return; | |
2844 } | |
2845 | |
2846 // make the constantPoolOop safe to return | |
2847 _prev_constant_pool_handle = constantPoolHandle(cp); | |
2848 | |
2849 GrowableArray<jweak>* method_refs = pv_node->prev_EMCP_methods(); | |
2850 if (method_refs == NULL) { | |
2851 // the instanceKlass did not have any EMCP methods | |
2852 return; | |
2853 } | |
2854 | |
2855 _prev_EMCP_method_handles = new GrowableArray<methodHandle>(10); | |
2856 | |
2857 int n_methods = method_refs->length(); | |
2858 for (int i = 0; i < n_methods; i++) { | |
2859 jweak method_ref = method_refs->at(i); | |
2860 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); | |
2861 if (method_ref == NULL) { | |
2862 continue; // robustness | |
2863 } | |
2864 | |
2865 methodOop method = (methodOop)JNIHandles::resolve(method_ref); | |
2866 if (method == NULL) { | |
2867 // this entry has been GC'ed so skip it | |
2868 continue; | |
2869 } | |
2870 | |
2871 // make the methodOop safe to return | |
2872 _prev_EMCP_method_handles->append(methodHandle(method)); | |
2873 } | |
2874 } | |
2875 | |
2876 | |
2877 // Destroy a PreviousVersionInfo | |
2878 PreviousVersionInfo::~PreviousVersionInfo() { | |
2879 // Since _prev_EMCP_method_handles is not C-heap allocated, we | |
2880 // don't have to delete it. | |
2881 } | |
2882 | |
2883 | |
2884 // Construct a helper for walking the previous versions array | |
2885 PreviousVersionWalker::PreviousVersionWalker(instanceKlass *ik) { | |
2886 _previous_versions = ik->previous_versions(); | |
2887 _current_index = 0; | |
2888 // _hm needs no initialization | |
2889 _current_p = NULL; | |
2890 } | |
2891 | |
2892 | |
2893 // Destroy a PreviousVersionWalker | |
2894 PreviousVersionWalker::~PreviousVersionWalker() { | |
2895 // Delete the current info just in case the caller didn't walk to | |
2896 // the end of the previous versions list. No harm if _current_p is | |
2897 // already NULL. | |
2898 delete _current_p; | |
2899 | |
2900 // When _hm is destroyed, all the Handles returned in | |
2901 // PreviousVersionInfo objects will be destroyed. | |
2902 // Also, after this destructor is finished it will be | |
2903 // safe to delete the GrowableArray allocated in the | |
2904 // PreviousVersionInfo objects. | |
2905 } | |
2906 | |
2907 | |
2908 // Return the interesting information for the next previous version | |
2909 // of the klass. Returns NULL if there are no more previous versions. | |
2910 PreviousVersionInfo* PreviousVersionWalker::next_previous_version() { | |
2911 if (_previous_versions == NULL) { | |
2912 // no previous versions so nothing to return | |
2913 return NULL; | |
2914 } | |
2915 | |
2916 delete _current_p; // cleanup the previous info for the caller | |
2917 _current_p = NULL; // reset to NULL so we don't delete same object twice | |
2918 | |
2919 int length = _previous_versions->length(); | |
2920 | |
2921 while (_current_index < length) { | |
2922 PreviousVersionNode * pv_node = _previous_versions->at(_current_index++); | |
2923 PreviousVersionInfo * pv_info = new (ResourceObj::C_HEAP) | |
2924 PreviousVersionInfo(pv_node); | |
2925 | |
2926 constantPoolHandle cp_h = pv_info->prev_constant_pool_handle(); | |
2927 if (cp_h.is_null()) { | |
2928 delete pv_info; | |
2929 | |
2930 // The underlying node's info has been GC'ed so try the next one. | |
2931 // We don't have to check the methods. If the constant pool has | |
2932 // GC'ed then so have the methods. | |
2933 continue; | |
2934 } | |
2935 | |
2936 // Found a node with non GC'ed info so return it. The caller will | |
2937 // need to delete pv_info when they are done with it. | |
2938 _current_p = pv_info; | |
2939 return pv_info; | |
2940 } | |
2941 | |
2942 // all of the underlying nodes' info has been GC'ed | |
2943 return NULL; | |
2944 } // end next_previous_version() |