Mercurial > hg > truffle
annotate src/share/vm/oops/instanceKlass.cpp @ 4739:52b5d32fbfaf
7117052: instanceKlass::_init_state can be u1 type
Summary: Change instanceKlass::_init_state field to u1 type.
Reviewed-by: bdelsart, coleenp, dholmes, phh, never
Contributed-by: Jiangli Zhou <jiangli.zhou@oracle.com>
| author | coleenp |
|---|---|
| date | Tue, 06 Dec 2011 18:28:51 -0500 |
| parents | 436b4a3231bf |
| children | 33df1aeaebbf a735aec54ea4 f7c4174b33ba |
| rev | line source |
|---|---|
| 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 * | |
|
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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 | |
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211 ClassState old_state = this_oop->init_state(); |
| 0 | 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 |
|
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1270 if (jmeths != NULL) { |
|
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1271 // copy any existing entries from the old cache |
|
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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 } |
|
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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. |
|
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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); |
|
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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 } | |
|
977
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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 | |
|
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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(); \ |
|
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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(); \ |
|
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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(), \ |
|
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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(), \ |
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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(); \ |
|
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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(), \ |
|
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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(), \ |
|
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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) { |
|
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1700 assert(obj != NULL, "can't follow the content of NULL object"); |
| 0 | 1701 obj->follow_header(); |
|
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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) { | |
|
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1711 assert(obj != NULL, "can't follow the content of NULL object"); |
| 0 | 1712 obj->follow_header(cm); |
|
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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) { \ |
|
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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 | |
|
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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) | |
|
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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) |
|
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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) { |
|
652
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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)); |
|
652
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|
2050 } |
| 0 | 2051 |
|
665
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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, |
|
2177
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|
2054 Symbol*& simple_name_result, TRAPS) { |
|
665
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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. |
|
c89f86385056
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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. | |
|
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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 | |
|
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2295 #define BULLET " - " |
|
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2296 |
| 0 | 2297 void FieldPrinter::do_field(fieldDescriptor* fd) { |
|
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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()) { | |
|
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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 | |
|
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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()) { |
|
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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); |
|
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|
2337 st->print(BULLET"fake entry for mirror: "); |
| 0 | 2338 mirrored_klass->print_value_on(st); |
| 2339 st->cr(); | |
|
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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); | |
|
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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()) { |
|
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2352 instanceKlass::cast(real_klass)->do_local_static_fields(&print_field); |
|
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2353 } |
|
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2354 } else if (as_klassOop() == SystemDictionary::MethodType_klass()) { |
|
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2355 st->print(BULLET"signature: "); |
|
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2356 java_lang_invoke_MethodType::print_signature(obj, st); |
|
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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() |
|
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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()) { |
|
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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(" = "); |
|
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2387 java_lang_invoke_MethodType::print_signature(obj, st); |
|
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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 { | |
|
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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"); |
|
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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 } | |
|
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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 | |
|
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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 | |
|
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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) { | |
|
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|
2450 while (current != NULL) { |
|
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|
2451 JNIid* next = current->next(); |
|
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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 | |
|
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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(); |
|
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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 |
|
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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 | |
|
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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"); |
|
4739
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|
2482 _init_state = (u1)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, |
|
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|
2497 BitMap* emcp_methods, int emcp_method_count) { |
| 0 | 2498 assert(Thread::current()->is_VM_thread(), |
|
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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()); | |
|
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|
2513 jobject cp_ref; |
|
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|
2514 if (cp_h->is_shared()) { |
|
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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 } | |
|
47
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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); | |
|
2177
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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() |