Mercurial > hg > truffle
annotate src/share/vm/oops/instanceKlass.cpp @ 3960:f08d439fab8c
7089790: integrate bsd-port changes
Reviewed-by: kvn, twisti, jrose
Contributed-by: Kurt Miller <kurt@intricatesoftware.com>, Greg Lewis <glewis@eyesbeyond.com>, Jung-uk Kim <jkim@freebsd.org>, Christos Zoulas <christos@zoulas.com>, Landon Fuller <landonf@plausible.coop>, The FreeBSD Foundation <board@freebsdfoundation.org>, Michael Franz <mvfranz@gmail.com>, Roger Hoover <rhoover@apple.com>, Alexander Strange <astrange@apple.com>
| author | never |
|---|---|
| date | Sun, 25 Sep 2011 16:03:29 -0700 |
| parents | f6f3bb0ee072 |
| children | 436b4a3231bf |
| 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 |
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83 HS_DTRACE_PROBE_DECL4(hotspot, class__initialization__required, |
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84 char*, intptr_t, oop, intptr_t); |
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85 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__recursive, |
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86 char*, intptr_t, oop, intptr_t, int); |
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87 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__concurrent, |
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88 char*, intptr_t, oop, intptr_t, int); |
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89 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__erroneous, |
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90 char*, intptr_t, oop, intptr_t, int); |
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91 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__super__failed, |
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92 char*, intptr_t, oop, intptr_t, int); |
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93 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__clinit, |
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94 char*, intptr_t, oop, intptr_t, int); |
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95 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__error, |
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96 char*, intptr_t, oop, intptr_t, int); |
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97 HS_DTRACE_PROBE_DECL5(hotspot, class__initialization__end, |
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98 char*, intptr_t, oop, intptr_t, int); |
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99 |
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100 #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type) \ |
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101 { \ |
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102 char* data = NULL; \ |
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103 int len = 0; \ |
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104 Symbol* name = (clss)->name(); \ |
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105 if (name != NULL) { \ |
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106 data = (char*)name->bytes(); \ |
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107 len = name->utf8_length(); \ |
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108 } \ |
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109 HS_DTRACE_PROBE4(hotspot, class__initialization__##type, \ |
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110 data, len, (clss)->class_loader(), thread_type); \ |
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111 } |
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112 |
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113 #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait) \ |
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114 { \ |
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115 char* data = NULL; \ |
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116 int len = 0; \ |
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117 Symbol* name = (clss)->name(); \ |
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118 if (name != NULL) { \ |
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119 data = (char*)name->bytes(); \ |
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120 len = name->utf8_length(); \ |
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121 } \ |
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122 HS_DTRACE_PROBE5(hotspot, class__initialization__##type, \ |
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123 data, len, (clss)->class_loader(), thread_type, wait); \ |
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124 } |
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125 |
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126 #else // ndef DTRACE_ENABLED |
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127 |
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128 #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type) |
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129 #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait) |
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130 |
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131 #endif // ndef DTRACE_ENABLED |
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132 |
| 0 | 133 bool instanceKlass::should_be_initialized() const { |
| 134 return !is_initialized(); | |
| 135 } | |
| 136 | |
| 137 klassVtable* instanceKlass::vtable() const { | |
| 138 return new klassVtable(as_klassOop(), start_of_vtable(), vtable_length() / vtableEntry::size()); | |
| 139 } | |
| 140 | |
| 141 klassItable* instanceKlass::itable() const { | |
| 142 return new klassItable(as_klassOop()); | |
| 143 } | |
| 144 | |
| 145 void instanceKlass::eager_initialize(Thread *thread) { | |
| 146 if (!EagerInitialization) return; | |
| 147 | |
| 148 if (this->is_not_initialized()) { | |
| 149 // abort if the the class has a class initializer | |
| 150 if (this->class_initializer() != NULL) return; | |
| 151 | |
| 152 // abort if it is java.lang.Object (initialization is handled in genesis) | |
| 153 klassOop super = this->super(); | |
| 154 if (super == NULL) return; | |
| 155 | |
| 156 // abort if the super class should be initialized | |
| 157 if (!instanceKlass::cast(super)->is_initialized()) return; | |
| 158 | |
| 159 // call body to expose the this pointer | |
| 160 instanceKlassHandle this_oop(thread, this->as_klassOop()); | |
| 161 eager_initialize_impl(this_oop); | |
| 162 } | |
| 163 } | |
| 164 | |
| 165 | |
| 166 void instanceKlass::eager_initialize_impl(instanceKlassHandle this_oop) { | |
| 167 EXCEPTION_MARK; | |
| 168 ObjectLocker ol(this_oop, THREAD); | |
| 169 | |
| 170 // abort if someone beat us to the initialization | |
| 171 if (!this_oop->is_not_initialized()) return; // note: not equivalent to is_initialized() | |
| 172 | |
| 173 ClassState old_state = this_oop->_init_state; | |
| 174 link_class_impl(this_oop, true, THREAD); | |
| 175 if (HAS_PENDING_EXCEPTION) { | |
| 176 CLEAR_PENDING_EXCEPTION; | |
| 177 // Abort if linking the class throws an exception. | |
| 178 | |
| 179 // Use a test to avoid redundantly resetting the state if there's | |
| 180 // no change. Set_init_state() asserts that state changes make | |
| 181 // progress, whereas here we might just be spinning in place. | |
| 182 if( old_state != this_oop->_init_state ) | |
| 183 this_oop->set_init_state (old_state); | |
| 184 } else { | |
| 185 // linking successfull, mark class as initialized | |
| 186 this_oop->set_init_state (fully_initialized); | |
| 187 // trace | |
| 188 if (TraceClassInitialization) { | |
| 189 ResourceMark rm(THREAD); | |
| 190 tty->print_cr("[Initialized %s without side effects]", this_oop->external_name()); | |
| 191 } | |
| 192 } | |
| 193 } | |
| 194 | |
| 195 | |
| 196 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization | |
| 197 // process. The step comments refers to the procedure described in that section. | |
| 198 // Note: implementation moved to static method to expose the this pointer. | |
| 199 void instanceKlass::initialize(TRAPS) { | |
| 200 if (this->should_be_initialized()) { | |
| 201 HandleMark hm(THREAD); | |
| 202 instanceKlassHandle this_oop(THREAD, this->as_klassOop()); | |
| 203 initialize_impl(this_oop, CHECK); | |
| 204 // Note: at this point the class may be initialized | |
| 205 // OR it may be in the state of being initialized | |
| 206 // in case of recursive initialization! | |
| 207 } else { | |
| 208 assert(is_initialized(), "sanity check"); | |
| 209 } | |
| 210 } | |
| 211 | |
| 212 | |
| 213 bool instanceKlass::verify_code( | |
| 214 instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS) { | |
| 215 // 1) Verify the bytecodes | |
| 216 Verifier::Mode mode = | |
| 217 throw_verifyerror ? Verifier::ThrowException : Verifier::NoException; | |
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218 return Verifier::verify(this_oop, mode, this_oop->should_verify_class(), CHECK_false); |
| 0 | 219 } |
| 220 | |
| 221 | |
| 222 // Used exclusively by the shared spaces dump mechanism to prevent | |
| 223 // classes mapped into the shared regions in new VMs from appearing linked. | |
| 224 | |
| 225 void instanceKlass::unlink_class() { | |
| 226 assert(is_linked(), "must be linked"); | |
| 227 _init_state = loaded; | |
| 228 } | |
| 229 | |
| 230 void instanceKlass::link_class(TRAPS) { | |
| 231 assert(is_loaded(), "must be loaded"); | |
| 232 if (!is_linked()) { | |
| 233 instanceKlassHandle this_oop(THREAD, this->as_klassOop()); | |
| 234 link_class_impl(this_oop, true, CHECK); | |
| 235 } | |
| 236 } | |
| 237 | |
| 238 // Called to verify that a class can link during initialization, without | |
| 239 // throwing a VerifyError. | |
| 240 bool instanceKlass::link_class_or_fail(TRAPS) { | |
| 241 assert(is_loaded(), "must be loaded"); | |
| 242 if (!is_linked()) { | |
| 243 instanceKlassHandle this_oop(THREAD, this->as_klassOop()); | |
| 244 link_class_impl(this_oop, false, CHECK_false); | |
| 245 } | |
| 246 return is_linked(); | |
| 247 } | |
| 248 | |
| 249 bool instanceKlass::link_class_impl( | |
| 250 instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS) { | |
| 251 // check for error state | |
| 252 if (this_oop->is_in_error_state()) { | |
| 253 ResourceMark rm(THREAD); | |
| 254 THROW_MSG_(vmSymbols::java_lang_NoClassDefFoundError(), | |
| 255 this_oop->external_name(), false); | |
| 256 } | |
| 257 // return if already verified | |
| 258 if (this_oop->is_linked()) { | |
| 259 return true; | |
| 260 } | |
| 261 | |
| 262 // Timing | |
| 263 // timer handles recursion | |
| 264 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl"); | |
| 265 JavaThread* jt = (JavaThread*)THREAD; | |
| 266 | |
| 267 // link super class before linking this class | |
| 268 instanceKlassHandle super(THREAD, this_oop->super()); | |
| 269 if (super.not_null()) { | |
| 270 if (super->is_interface()) { // check if super class is an interface | |
| 271 ResourceMark rm(THREAD); | |
| 272 Exceptions::fthrow( | |
| 273 THREAD_AND_LOCATION, | |
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274 vmSymbols::java_lang_IncompatibleClassChangeError(), |
| 0 | 275 "class %s has interface %s as super class", |
| 276 this_oop->external_name(), | |
| 277 super->external_name() | |
| 278 ); | |
| 279 return false; | |
| 280 } | |
| 281 | |
| 282 link_class_impl(super, throw_verifyerror, CHECK_false); | |
| 283 } | |
| 284 | |
| 285 // link all interfaces implemented by this class before linking this class | |
| 286 objArrayHandle interfaces (THREAD, this_oop->local_interfaces()); | |
| 287 int num_interfaces = interfaces->length(); | |
| 288 for (int index = 0; index < num_interfaces; index++) { | |
| 289 HandleMark hm(THREAD); | |
| 290 instanceKlassHandle ih(THREAD, klassOop(interfaces->obj_at(index))); | |
| 291 link_class_impl(ih, throw_verifyerror, CHECK_false); | |
| 292 } | |
| 293 | |
| 294 // in case the class is linked in the process of linking its superclasses | |
| 295 if (this_oop->is_linked()) { | |
| 296 return true; | |
| 297 } | |
| 298 | |
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299 // trace only the link time for this klass that includes |
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300 // the verification time |
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301 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(), |
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302 ClassLoader::perf_class_link_selftime(), |
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303 ClassLoader::perf_classes_linked(), |
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304 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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305 jt->get_thread_stat()->perf_timers_addr(), |
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306 PerfClassTraceTime::CLASS_LINK); |
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307 |
| 0 | 308 // verification & rewriting |
| 309 { | |
| 310 ObjectLocker ol(this_oop, THREAD); | |
| 311 // rewritten will have been set if loader constraint error found | |
| 312 // on an earlier link attempt | |
| 313 // don't verify or rewrite if already rewritten | |
| 314 if (!this_oop->is_linked()) { | |
| 315 if (!this_oop->is_rewritten()) { | |
| 316 { | |
| 317 // Timer includes any side effects of class verification (resolution, | |
| 318 // etc), but not recursive entry into verify_code(). | |
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319 PerfClassTraceTime timer(ClassLoader::perf_class_verify_time(), |
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320 ClassLoader::perf_class_verify_selftime(), |
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321 ClassLoader::perf_classes_verified(), |
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322 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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323 jt->get_thread_stat()->perf_timers_addr(), |
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324 PerfClassTraceTime::CLASS_VERIFY); |
| 0 | 325 bool verify_ok = verify_code(this_oop, throw_verifyerror, THREAD); |
| 326 if (!verify_ok) { | |
| 327 return false; | |
| 328 } | |
| 329 } | |
| 330 | |
| 331 // Just in case a side-effect of verify linked this class already | |
| 332 // (which can sometimes happen since the verifier loads classes | |
| 333 // using custom class loaders, which are free to initialize things) | |
| 334 if (this_oop->is_linked()) { | |
| 335 return true; | |
| 336 } | |
| 337 | |
| 338 // also sets rewritten | |
| 339 this_oop->rewrite_class(CHECK_false); | |
| 340 } | |
| 341 | |
| 3748 | 342 // relocate jsrs and link methods after they are all rewritten |
| 343 this_oop->relocate_and_link_methods(CHECK_false); | |
| 344 | |
| 0 | 345 // Initialize the vtable and interface table after |
| 346 // methods have been rewritten since rewrite may | |
| 347 // fabricate new methodOops. | |
| 348 // also does loader constraint checking | |
| 349 if (!this_oop()->is_shared()) { | |
| 350 ResourceMark rm(THREAD); | |
| 351 this_oop->vtable()->initialize_vtable(true, CHECK_false); | |
| 352 this_oop->itable()->initialize_itable(true, CHECK_false); | |
| 353 } | |
| 354 #ifdef ASSERT | |
| 355 else { | |
| 356 ResourceMark rm(THREAD); | |
| 357 this_oop->vtable()->verify(tty, true); | |
| 358 // In case itable verification is ever added. | |
| 359 // this_oop->itable()->verify(tty, true); | |
| 360 } | |
| 361 #endif | |
| 362 this_oop->set_init_state(linked); | |
| 363 if (JvmtiExport::should_post_class_prepare()) { | |
| 364 Thread *thread = THREAD; | |
| 365 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); | |
| 366 JvmtiExport::post_class_prepare((JavaThread *) thread, this_oop()); | |
| 367 } | |
| 368 } | |
| 369 } | |
| 370 return true; | |
| 371 } | |
| 372 | |
| 373 | |
| 374 // Rewrite the byte codes of all of the methods of a class. | |
| 375 // The rewriter must be called exactly once. Rewriting must happen after | |
| 376 // verification but before the first method of the class is executed. | |
| 377 void instanceKlass::rewrite_class(TRAPS) { | |
| 378 assert(is_loaded(), "must be loaded"); | |
| 379 instanceKlassHandle this_oop(THREAD, this->as_klassOop()); | |
| 380 if (this_oop->is_rewritten()) { | |
| 381 assert(this_oop()->is_shared(), "rewriting an unshared class?"); | |
| 382 return; | |
| 383 } | |
| 3748 | 384 Rewriter::rewrite(this_oop, CHECK); |
| 0 | 385 this_oop->set_rewritten(); |
| 386 } | |
| 387 | |
| 3748 | 388 // Now relocate and link method entry points after class is rewritten. |
| 389 // This is outside is_rewritten flag. In case of an exception, it can be | |
| 390 // executed more than once. | |
| 391 void instanceKlass::relocate_and_link_methods(TRAPS) { | |
| 392 assert(is_loaded(), "must be loaded"); | |
| 393 instanceKlassHandle this_oop(THREAD, this->as_klassOop()); | |
| 394 Rewriter::relocate_and_link(this_oop, CHECK); | |
| 395 } | |
| 396 | |
| 0 | 397 |
| 398 void instanceKlass::initialize_impl(instanceKlassHandle this_oop, TRAPS) { | |
| 399 // Make sure klass is linked (verified) before initialization | |
| 400 // A class could already be verified, since it has been reflected upon. | |
| 401 this_oop->link_class(CHECK); | |
| 402 | |
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403 DTRACE_CLASSINIT_PROBE(required, instanceKlass::cast(this_oop()), -1); |
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404 |
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405 bool wait = false; |
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406 |
| 0 | 407 // refer to the JVM book page 47 for description of steps |
| 408 // Step 1 | |
| 409 { ObjectLocker ol(this_oop, THREAD); | |
| 410 | |
| 411 Thread *self = THREAD; // it's passed the current thread | |
| 412 | |
| 413 // Step 2 | |
| 414 // If we were to use wait() instead of waitInterruptibly() then | |
| 415 // we might end up throwing IE from link/symbol resolution sites | |
| 416 // that aren't expected to throw. This would wreak havoc. See 6320309. | |
| 417 while(this_oop->is_being_initialized() && !this_oop->is_reentrant_initialization(self)) { | |
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418 wait = true; |
| 0 | 419 ol.waitUninterruptibly(CHECK); |
| 420 } | |
| 421 | |
| 422 // Step 3 | |
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423 if (this_oop->is_being_initialized() && this_oop->is_reentrant_initialization(self)) { |
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424 DTRACE_CLASSINIT_PROBE_WAIT(recursive, instanceKlass::cast(this_oop()), -1,wait); |
| 0 | 425 return; |
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426 } |
| 0 | 427 |
| 428 // Step 4 | |
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429 if (this_oop->is_initialized()) { |
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430 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, instanceKlass::cast(this_oop()), -1,wait); |
| 0 | 431 return; |
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432 } |
| 0 | 433 |
| 434 // Step 5 | |
| 435 if (this_oop->is_in_error_state()) { | |
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436 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, instanceKlass::cast(this_oop()), -1,wait); |
| 0 | 437 ResourceMark rm(THREAD); |
| 438 const char* desc = "Could not initialize class "; | |
| 439 const char* className = this_oop->external_name(); | |
| 440 size_t msglen = strlen(desc) + strlen(className) + 1; | |
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441 char* message = NEW_RESOURCE_ARRAY(char, msglen); |
| 0 | 442 if (NULL == message) { |
| 443 // Out of memory: can't create detailed error message | |
| 444 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className); | |
| 445 } else { | |
| 446 jio_snprintf(message, msglen, "%s%s", desc, className); | |
| 447 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message); | |
| 448 } | |
| 449 } | |
| 450 | |
| 451 // Step 6 | |
| 452 this_oop->set_init_state(being_initialized); | |
| 453 this_oop->set_init_thread(self); | |
| 454 } | |
| 455 | |
| 456 // Step 7 | |
| 457 klassOop super_klass = this_oop->super(); | |
| 458 if (super_klass != NULL && !this_oop->is_interface() && Klass::cast(super_klass)->should_be_initialized()) { | |
| 459 Klass::cast(super_klass)->initialize(THREAD); | |
| 460 | |
| 461 if (HAS_PENDING_EXCEPTION) { | |
| 462 Handle e(THREAD, PENDING_EXCEPTION); | |
| 463 CLEAR_PENDING_EXCEPTION; | |
| 464 { | |
| 465 EXCEPTION_MARK; | |
| 466 this_oop->set_initialization_state_and_notify(initialization_error, THREAD); // Locks object, set state, and notify all waiting threads | |
| 467 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, superclass initialization error is thrown below | |
| 468 } | |
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469 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, instanceKlass::cast(this_oop()), -1,wait); |
| 0 | 470 THROW_OOP(e()); |
| 471 } | |
| 472 } | |
| 473 | |
| 474 // Step 8 | |
| 475 { | |
| 476 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl"); | |
| 477 JavaThread* jt = (JavaThread*)THREAD; | |
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478 DTRACE_CLASSINIT_PROBE_WAIT(clinit, instanceKlass::cast(this_oop()), -1,wait); |
| 0 | 479 // Timer includes any side effects of class initialization (resolution, |
| 480 // etc), but not recursive entry into call_class_initializer(). | |
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481 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(), |
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482 ClassLoader::perf_class_init_selftime(), |
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483 ClassLoader::perf_classes_inited(), |
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484 jt->get_thread_stat()->perf_recursion_counts_addr(), |
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485 jt->get_thread_stat()->perf_timers_addr(), |
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486 PerfClassTraceTime::CLASS_CLINIT); |
| 0 | 487 this_oop->call_class_initializer(THREAD); |
| 488 } | |
| 489 | |
| 490 // Step 9 | |
| 491 if (!HAS_PENDING_EXCEPTION) { | |
| 492 this_oop->set_initialization_state_and_notify(fully_initialized, CHECK); | |
| 493 { ResourceMark rm(THREAD); | |
| 494 debug_only(this_oop->vtable()->verify(tty, true);) | |
| 495 } | |
| 496 } | |
| 497 else { | |
| 498 // Step 10 and 11 | |
| 499 Handle e(THREAD, PENDING_EXCEPTION); | |
| 500 CLEAR_PENDING_EXCEPTION; | |
| 501 { | |
| 502 EXCEPTION_MARK; | |
| 503 this_oop->set_initialization_state_and_notify(initialization_error, THREAD); | |
| 504 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below | |
| 505 } | |
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506 DTRACE_CLASSINIT_PROBE_WAIT(error, instanceKlass::cast(this_oop()), -1,wait); |
| 1142 | 507 if (e->is_a(SystemDictionary::Error_klass())) { |
| 0 | 508 THROW_OOP(e()); |
| 509 } else { | |
| 510 JavaCallArguments args(e); | |
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511 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(), |
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512 vmSymbols::throwable_void_signature(), |
| 0 | 513 &args); |
| 514 } | |
| 515 } | |
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516 DTRACE_CLASSINIT_PROBE_WAIT(end, instanceKlass::cast(this_oop()), -1,wait); |
| 0 | 517 } |
| 518 | |
| 519 | |
| 520 // Note: implementation moved to static method to expose the this pointer. | |
| 521 void instanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) { | |
| 522 instanceKlassHandle kh(THREAD, this->as_klassOop()); | |
| 523 set_initialization_state_and_notify_impl(kh, state, CHECK); | |
| 524 } | |
| 525 | |
| 526 void instanceKlass::set_initialization_state_and_notify_impl(instanceKlassHandle this_oop, ClassState state, TRAPS) { | |
| 527 ObjectLocker ol(this_oop, THREAD); | |
| 528 this_oop->set_init_state(state); | |
| 529 ol.notify_all(CHECK); | |
| 530 } | |
| 531 | |
| 532 void instanceKlass::add_implementor(klassOop k) { | |
| 533 assert(Compile_lock->owned_by_self(), ""); | |
| 534 // Filter out my subinterfaces. | |
| 535 // (Note: Interfaces are never on the subklass list.) | |
| 536 if (instanceKlass::cast(k)->is_interface()) return; | |
| 537 | |
| 538 // Filter out subclasses whose supers already implement me. | |
| 539 // (Note: CHA must walk subclasses of direct implementors | |
| 540 // in order to locate indirect implementors.) | |
| 541 klassOop sk = instanceKlass::cast(k)->super(); | |
| 542 if (sk != NULL && instanceKlass::cast(sk)->implements_interface(as_klassOop())) | |
| 543 // We only need to check one immediate superclass, since the | |
| 544 // implements_interface query looks at transitive_interfaces. | |
| 545 // Any supers of the super have the same (or fewer) transitive_interfaces. | |
| 546 return; | |
| 547 | |
| 548 // Update number of implementors | |
| 549 int i = _nof_implementors++; | |
| 550 | |
| 551 // Record this implementor, if there are not too many already | |
| 552 if (i < implementors_limit) { | |
| 553 assert(_implementors[i] == NULL, "should be exactly one implementor"); | |
| 554 oop_store_without_check((oop*)&_implementors[i], k); | |
| 555 } else if (i == implementors_limit) { | |
| 556 // clear out the list on first overflow | |
| 557 for (int i2 = 0; i2 < implementors_limit; i2++) | |
| 558 oop_store_without_check((oop*)&_implementors[i2], NULL); | |
| 559 } | |
| 560 | |
| 561 // The implementor also implements the transitive_interfaces | |
| 562 for (int index = 0; index < local_interfaces()->length(); index++) { | |
| 563 instanceKlass::cast(klassOop(local_interfaces()->obj_at(index)))->add_implementor(k); | |
| 564 } | |
| 565 } | |
| 566 | |
| 567 void instanceKlass::init_implementor() { | |
| 568 for (int i = 0; i < implementors_limit; i++) | |
| 569 oop_store_without_check((oop*)&_implementors[i], NULL); | |
| 570 _nof_implementors = 0; | |
| 571 } | |
| 572 | |
| 573 | |
| 574 void instanceKlass::process_interfaces(Thread *thread) { | |
| 575 // link this class into the implementors list of every interface it implements | |
| 576 KlassHandle this_as_oop (thread, this->as_klassOop()); | |
| 577 for (int i = local_interfaces()->length() - 1; i >= 0; i--) { | |
| 578 assert(local_interfaces()->obj_at(i)->is_klass(), "must be a klass"); | |
| 579 instanceKlass* interf = instanceKlass::cast(klassOop(local_interfaces()->obj_at(i))); | |
| 580 assert(interf->is_interface(), "expected interface"); | |
| 581 interf->add_implementor(this_as_oop()); | |
| 582 } | |
| 583 } | |
| 584 | |
| 585 bool instanceKlass::can_be_primary_super_slow() const { | |
| 586 if (is_interface()) | |
| 587 return false; | |
| 588 else | |
| 589 return Klass::can_be_primary_super_slow(); | |
| 590 } | |
| 591 | |
| 592 objArrayOop instanceKlass::compute_secondary_supers(int num_extra_slots, TRAPS) { | |
| 593 // The secondaries are the implemented interfaces. | |
| 594 instanceKlass* ik = instanceKlass::cast(as_klassOop()); | |
| 595 objArrayHandle interfaces (THREAD, ik->transitive_interfaces()); | |
| 596 int num_secondaries = num_extra_slots + interfaces->length(); | |
| 597 if (num_secondaries == 0) { | |
| 598 return Universe::the_empty_system_obj_array(); | |
| 599 } else if (num_extra_slots == 0) { | |
| 600 return interfaces(); | |
| 601 } else { | |
| 602 // a mix of both | |
| 603 objArrayOop secondaries = oopFactory::new_system_objArray(num_secondaries, CHECK_NULL); | |
| 604 for (int i = 0; i < interfaces->length(); i++) { | |
| 605 secondaries->obj_at_put(num_extra_slots+i, interfaces->obj_at(i)); | |
| 606 } | |
| 607 return secondaries; | |
| 608 } | |
| 609 } | |
| 610 | |
| 611 bool instanceKlass::compute_is_subtype_of(klassOop k) { | |
| 612 if (Klass::cast(k)->is_interface()) { | |
| 613 return implements_interface(k); | |
| 614 } else { | |
| 615 return Klass::compute_is_subtype_of(k); | |
| 616 } | |
| 617 } | |
| 618 | |
| 619 bool instanceKlass::implements_interface(klassOop k) const { | |
| 620 if (as_klassOop() == k) return true; | |
| 621 assert(Klass::cast(k)->is_interface(), "should be an interface class"); | |
| 622 for (int i = 0; i < transitive_interfaces()->length(); i++) { | |
| 623 if (transitive_interfaces()->obj_at(i) == k) { | |
| 624 return true; | |
| 625 } | |
| 626 } | |
| 627 return false; | |
| 628 } | |
| 629 | |
| 630 objArrayOop instanceKlass::allocate_objArray(int n, int length, TRAPS) { | |
| 631 if (length < 0) THROW_0(vmSymbols::java_lang_NegativeArraySizeException()); | |
| 632 if (length > arrayOopDesc::max_array_length(T_OBJECT)) { | |
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633 report_java_out_of_memory("Requested array size exceeds VM limit"); |
| 0 | 634 THROW_OOP_0(Universe::out_of_memory_error_array_size()); |
| 635 } | |
| 636 int size = objArrayOopDesc::object_size(length); | |
| 637 klassOop ak = array_klass(n, CHECK_NULL); | |
| 638 KlassHandle h_ak (THREAD, ak); | |
| 639 objArrayOop o = | |
| 640 (objArrayOop)CollectedHeap::array_allocate(h_ak, size, length, CHECK_NULL); | |
| 641 return o; | |
| 642 } | |
| 643 | |
| 644 instanceOop instanceKlass::register_finalizer(instanceOop i, TRAPS) { | |
| 645 if (TraceFinalizerRegistration) { | |
| 646 tty->print("Registered "); | |
| 647 i->print_value_on(tty); | |
| 648 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", (address)i); | |
| 649 } | |
| 650 instanceHandle h_i(THREAD, i); | |
| 651 // Pass the handle as argument, JavaCalls::call expects oop as jobjects | |
| 652 JavaValue result(T_VOID); | |
| 653 JavaCallArguments args(h_i); | |
| 654 methodHandle mh (THREAD, Universe::finalizer_register_method()); | |
| 655 JavaCalls::call(&result, mh, &args, CHECK_NULL); | |
| 656 return h_i(); | |
| 657 } | |
| 658 | |
| 659 instanceOop instanceKlass::allocate_instance(TRAPS) { | |
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660 assert(!oop_is_instanceMirror(), "wrong allocation path"); |
| 0 | 661 bool has_finalizer_flag = has_finalizer(); // Query before possible GC |
| 662 int size = size_helper(); // Query before forming handle. | |
| 663 | |
| 664 KlassHandle h_k(THREAD, as_klassOop()); | |
| 665 | |
| 666 instanceOop i; | |
| 667 | |
| 668 i = (instanceOop)CollectedHeap::obj_allocate(h_k, size, CHECK_NULL); | |
| 669 if (has_finalizer_flag && !RegisterFinalizersAtInit) { | |
| 670 i = register_finalizer(i, CHECK_NULL); | |
| 671 } | |
| 672 return i; | |
| 673 } | |
| 674 | |
| 675 instanceOop instanceKlass::allocate_permanent_instance(TRAPS) { | |
| 676 // Finalizer registration occurs in the Object.<init> constructor | |
| 677 // and constructors normally aren't run when allocating perm | |
| 678 // instances so simply disallow finalizable perm objects. This can | |
| 679 // be relaxed if a need for it is found. | |
| 680 assert(!has_finalizer(), "perm objects not allowed to have finalizers"); | |
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681 assert(!oop_is_instanceMirror(), "wrong allocation path"); |
| 0 | 682 int size = size_helper(); // Query before forming handle. |
| 683 KlassHandle h_k(THREAD, as_klassOop()); | |
| 684 instanceOop i = (instanceOop) | |
| 685 CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL); | |
| 686 return i; | |
| 687 } | |
| 688 | |
| 689 void instanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) { | |
| 690 if (is_interface() || is_abstract()) { | |
| 691 ResourceMark rm(THREAD); | |
| 692 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError() | |
| 693 : vmSymbols::java_lang_InstantiationException(), external_name()); | |
| 694 } | |
| 1142 | 695 if (as_klassOop() == SystemDictionary::Class_klass()) { |
| 0 | 696 ResourceMark rm(THREAD); |
| 697 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError() | |
| 698 : vmSymbols::java_lang_IllegalAccessException(), external_name()); | |
| 699 } | |
| 700 } | |
| 701 | |
| 702 klassOop instanceKlass::array_klass_impl(bool or_null, int n, TRAPS) { | |
| 703 instanceKlassHandle this_oop(THREAD, as_klassOop()); | |
| 704 return array_klass_impl(this_oop, or_null, n, THREAD); | |
| 705 } | |
| 706 | |
| 707 klassOop instanceKlass::array_klass_impl(instanceKlassHandle this_oop, bool or_null, int n, TRAPS) { | |
| 708 if (this_oop->array_klasses() == NULL) { | |
| 709 if (or_null) return NULL; | |
| 710 | |
| 711 ResourceMark rm; | |
| 712 JavaThread *jt = (JavaThread *)THREAD; | |
| 713 { | |
| 714 // Atomic creation of array_klasses | |
| 715 MutexLocker mc(Compile_lock, THREAD); // for vtables | |
| 716 MutexLocker ma(MultiArray_lock, THREAD); | |
| 717 | |
| 718 // Check if update has already taken place | |
| 719 if (this_oop->array_klasses() == NULL) { | |
| 720 objArrayKlassKlass* oakk = | |
| 721 (objArrayKlassKlass*)Universe::objArrayKlassKlassObj()->klass_part(); | |
| 722 | |
| 723 klassOop k = oakk->allocate_objArray_klass(1, this_oop, CHECK_NULL); | |
| 724 this_oop->set_array_klasses(k); | |
| 725 } | |
| 726 } | |
| 727 } | |
| 728 // _this will always be set at this point | |
| 729 objArrayKlass* oak = (objArrayKlass*)this_oop->array_klasses()->klass_part(); | |
| 730 if (or_null) { | |
| 731 return oak->array_klass_or_null(n); | |
| 732 } | |
| 733 return oak->array_klass(n, CHECK_NULL); | |
| 734 } | |
| 735 | |
| 736 klassOop instanceKlass::array_klass_impl(bool or_null, TRAPS) { | |
| 737 return array_klass_impl(or_null, 1, THREAD); | |
| 738 } | |
| 739 | |
| 740 void instanceKlass::call_class_initializer(TRAPS) { | |
| 741 instanceKlassHandle ik (THREAD, as_klassOop()); | |
| 742 call_class_initializer_impl(ik, THREAD); | |
| 743 } | |
| 744 | |
| 745 static int call_class_initializer_impl_counter = 0; // for debugging | |
| 746 | |
| 747 methodOop instanceKlass::class_initializer() { | |
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748 methodOop clinit = find_method( |
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749 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature()); |
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750 if (clinit != NULL && clinit->has_valid_initializer_flags()) { |
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751 return clinit; |
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752 } |
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753 return NULL; |
| 0 | 754 } |
| 755 | |
| 756 void instanceKlass::call_class_initializer_impl(instanceKlassHandle this_oop, TRAPS) { | |
| 757 methodHandle h_method(THREAD, this_oop->class_initializer()); | |
| 758 assert(!this_oop->is_initialized(), "we cannot initialize twice"); | |
| 759 if (TraceClassInitialization) { | |
| 760 tty->print("%d Initializing ", call_class_initializer_impl_counter++); | |
| 761 this_oop->name()->print_value(); | |
| 762 tty->print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", (address)this_oop()); | |
| 763 } | |
| 764 if (h_method() != NULL) { | |
| 765 JavaCallArguments args; // No arguments | |
| 766 JavaValue result(T_VOID); | |
| 767 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args) | |
| 768 } | |
| 769 } | |
| 770 | |
| 771 | |
| 772 void instanceKlass::mask_for(methodHandle method, int bci, | |
| 773 InterpreterOopMap* entry_for) { | |
| 774 // Dirty read, then double-check under a lock. | |
| 775 if (_oop_map_cache == NULL) { | |
| 776 // Otherwise, allocate a new one. | |
| 777 MutexLocker x(OopMapCacheAlloc_lock); | |
| 778 // First time use. Allocate a cache in C heap | |
| 779 if (_oop_map_cache == NULL) { | |
| 780 _oop_map_cache = new OopMapCache(); | |
| 781 } | |
| 782 } | |
| 783 // _oop_map_cache is constant after init; lookup below does is own locking. | |
| 784 _oop_map_cache->lookup(method, bci, entry_for); | |
| 785 } | |
| 786 | |
| 787 | |
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788 bool instanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { |
| 3938 | 789 for (JavaFieldStream fs(as_klassOop()); !fs.done(); fs.next()) { |
| 790 Symbol* f_name = fs.name(); | |
| 791 Symbol* f_sig = fs.signature(); | |
| 0 | 792 if (f_name == name && f_sig == sig) { |
| 3938 | 793 fd->initialize(as_klassOop(), fs.index()); |
| 0 | 794 return true; |
| 795 } | |
| 796 } | |
| 797 return false; | |
| 798 } | |
| 799 | |
| 800 | |
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801 void instanceKlass::shared_symbols_iterate(SymbolClosure* closure) { |
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802 Klass::shared_symbols_iterate(closure); |
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803 closure->do_symbol(&_generic_signature); |
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804 closure->do_symbol(&_source_file_name); |
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805 closure->do_symbol(&_source_debug_extension); |
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806 |
| 3938 | 807 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { |
| 808 int name_index = fs.name_index(); | |
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809 closure->do_symbol(constants()->symbol_at_addr(name_index)); |
| 3938 | 810 int sig_index = fs.signature_index(); |
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811 closure->do_symbol(constants()->symbol_at_addr(sig_index)); |
| 0 | 812 } |
| 813 } | |
| 814 | |
| 815 | |
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816 klassOop instanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { |
| 0 | 817 const int n = local_interfaces()->length(); |
| 818 for (int i = 0; i < n; i++) { | |
| 819 klassOop intf1 = klassOop(local_interfaces()->obj_at(i)); | |
| 820 assert(Klass::cast(intf1)->is_interface(), "just checking type"); | |
| 821 // search for field in current interface | |
| 822 if (instanceKlass::cast(intf1)->find_local_field(name, sig, fd)) { | |
| 823 assert(fd->is_static(), "interface field must be static"); | |
| 824 return intf1; | |
| 825 } | |
| 826 // search for field in direct superinterfaces | |
| 827 klassOop intf2 = instanceKlass::cast(intf1)->find_interface_field(name, sig, fd); | |
| 828 if (intf2 != NULL) return intf2; | |
| 829 } | |
| 830 // otherwise field lookup fails | |
| 831 return NULL; | |
| 832 } | |
| 833 | |
| 834 | |
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835 klassOop instanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { |
| 0 | 836 // search order according to newest JVM spec (5.4.3.2, p.167). |
| 837 // 1) search for field in current klass | |
| 838 if (find_local_field(name, sig, fd)) { | |
| 839 return as_klassOop(); | |
| 840 } | |
| 841 // 2) search for field recursively in direct superinterfaces | |
| 842 { klassOop intf = find_interface_field(name, sig, fd); | |
| 843 if (intf != NULL) return intf; | |
| 844 } | |
| 845 // 3) apply field lookup recursively if superclass exists | |
| 846 { klassOop supr = super(); | |
| 847 if (supr != NULL) return instanceKlass::cast(supr)->find_field(name, sig, fd); | |
| 848 } | |
| 849 // 4) otherwise field lookup fails | |
| 850 return NULL; | |
| 851 } | |
| 852 | |
| 853 | |
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854 klassOop instanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const { |
| 0 | 855 // search order according to newest JVM spec (5.4.3.2, p.167). |
| 856 // 1) search for field in current klass | |
| 857 if (find_local_field(name, sig, fd)) { | |
| 858 if (fd->is_static() == is_static) return as_klassOop(); | |
| 859 } | |
| 860 // 2) search for field recursively in direct superinterfaces | |
| 861 if (is_static) { | |
| 862 klassOop intf = find_interface_field(name, sig, fd); | |
| 863 if (intf != NULL) return intf; | |
| 864 } | |
| 865 // 3) apply field lookup recursively if superclass exists | |
| 866 { klassOop supr = super(); | |
| 867 if (supr != NULL) return instanceKlass::cast(supr)->find_field(name, sig, is_static, fd); | |
| 868 } | |
| 869 // 4) otherwise field lookup fails | |
| 870 return NULL; | |
| 871 } | |
| 872 | |
| 873 | |
| 874 bool instanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { | |
| 3938 | 875 for (JavaFieldStream fs(as_klassOop()); !fs.done(); fs.next()) { |
| 876 if (fs.offset() == offset) { | |
| 877 fd->initialize(as_klassOop(), fs.index()); | |
| 0 | 878 if (fd->is_static() == is_static) return true; |
| 879 } | |
| 880 } | |
| 881 return false; | |
| 882 } | |
| 883 | |
| 884 | |
| 885 bool instanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { | |
| 886 klassOop klass = as_klassOop(); | |
| 887 while (klass != NULL) { | |
| 888 if (instanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) { | |
| 889 return true; | |
| 890 } | |
| 891 klass = Klass::cast(klass)->super(); | |
| 892 } | |
| 893 return false; | |
| 894 } | |
| 895 | |
| 896 | |
| 897 void instanceKlass::methods_do(void f(methodOop method)) { | |
| 898 int len = methods()->length(); | |
| 899 for (int index = 0; index < len; index++) { | |
| 900 methodOop m = methodOop(methods()->obj_at(index)); | |
| 901 assert(m->is_method(), "must be method"); | |
| 902 f(m); | |
| 903 } | |
| 904 } | |
| 905 | |
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906 |
| 0 | 907 void instanceKlass::do_local_static_fields(FieldClosure* cl) { |
| 3938 | 908 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { |
| 909 if (fs.access_flags().is_static()) { | |
| 910 fieldDescriptor fd; | |
| 911 fd.initialize(as_klassOop(), fs.index()); | |
| 912 cl->do_field(&fd); | |
| 913 } | |
| 0 | 914 } |
| 915 } | |
| 916 | |
| 917 | |
| 918 void instanceKlass::do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS) { | |
| 919 instanceKlassHandle h_this(THREAD, as_klassOop()); | |
| 920 do_local_static_fields_impl(h_this, f, CHECK); | |
| 921 } | |
| 922 | |
| 923 | |
| 924 void instanceKlass::do_local_static_fields_impl(instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS) { | |
| 3938 | 925 for (JavaFieldStream fs(this_oop()); !fs.done(); fs.next()) { |
| 926 if (fs.access_flags().is_static()) { | |
| 927 fieldDescriptor fd; | |
| 928 fd.initialize(this_oop(), fs.index()); | |
| 929 f(&fd, CHECK); | |
| 930 } | |
| 0 | 931 } |
| 932 } | |
| 933 | |
| 934 | |
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935 static int compare_fields_by_offset(int* a, int* b) { |
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936 return a[0] - b[0]; |
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937 } |
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938 |
| 0 | 939 void instanceKlass::do_nonstatic_fields(FieldClosure* cl) { |
| 940 instanceKlass* super = superklass(); | |
| 941 if (super != NULL) { | |
| 942 super->do_nonstatic_fields(cl); | |
| 943 } | |
|
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944 fieldDescriptor fd; |
| 3938 | 945 int length = java_fields_count(); |
|
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946 // In DebugInfo nonstatic fields are sorted by offset. |
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947 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1)); |
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948 int j = 0; |
| 3938 | 949 for (int i = 0; i < length; i += 1) { |
| 0 | 950 fd.initialize(as_klassOop(), i); |
|
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951 if (!fd.is_static()) { |
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952 fields_sorted[j + 0] = fd.offset(); |
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953 fields_sorted[j + 1] = i; |
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954 j += 2; |
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955 } |
| 0 | 956 } |
|
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957 if (j > 0) { |
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958 length = j; |
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959 // _sort_Fn is defined in growableArray.hpp. |
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960 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset); |
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961 for (int i = 0; i < length; i += 2) { |
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962 fd.initialize(as_klassOop(), fields_sorted[i + 1]); |
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963 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields"); |
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964 cl->do_field(&fd); |
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965 } |
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966 } |
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967 FREE_C_HEAP_ARRAY(int, fields_sorted); |
| 0 | 968 } |
| 969 | |
| 970 | |
| 971 void instanceKlass::array_klasses_do(void f(klassOop k)) { | |
| 972 if (array_klasses() != NULL) | |
| 973 arrayKlass::cast(array_klasses())->array_klasses_do(f); | |
| 974 } | |
| 975 | |
| 976 | |
| 977 void instanceKlass::with_array_klasses_do(void f(klassOop k)) { | |
| 978 f(as_klassOop()); | |
| 979 array_klasses_do(f); | |
| 980 } | |
| 981 | |
| 982 #ifdef ASSERT | |
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983 static int linear_search(objArrayOop methods, Symbol* name, Symbol* signature) { |
| 0 | 984 int len = methods->length(); |
| 985 for (int index = 0; index < len; index++) { | |
| 986 methodOop m = (methodOop)(methods->obj_at(index)); | |
| 987 assert(m->is_method(), "must be method"); | |
| 988 if (m->signature() == signature && m->name() == name) { | |
| 989 return index; | |
| 990 } | |
| 991 } | |
| 992 return -1; | |
| 993 } | |
| 994 #endif | |
| 995 | |
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996 methodOop instanceKlass::find_method(Symbol* name, Symbol* signature) const { |
| 0 | 997 return instanceKlass::find_method(methods(), name, signature); |
| 998 } | |
| 999 | |
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1000 methodOop instanceKlass::find_method(objArrayOop methods, Symbol* name, Symbol* signature) { |
| 0 | 1001 int len = methods->length(); |
| 1002 // methods are sorted, so do binary search | |
| 1003 int l = 0; | |
| 1004 int h = len - 1; | |
| 1005 while (l <= h) { | |
| 1006 int mid = (l + h) >> 1; | |
| 1007 methodOop m = (methodOop)methods->obj_at(mid); | |
| 1008 assert(m->is_method(), "must be method"); | |
| 1009 int res = m->name()->fast_compare(name); | |
| 1010 if (res == 0) { | |
| 1011 // found matching name; do linear search to find matching signature | |
| 1012 // first, quick check for common case | |
| 1013 if (m->signature() == signature) return m; | |
| 1014 // search downwards through overloaded methods | |
| 1015 int i; | |
| 1016 for (i = mid - 1; i >= l; i--) { | |
| 1017 methodOop m = (methodOop)methods->obj_at(i); | |
| 1018 assert(m->is_method(), "must be method"); | |
| 1019 if (m->name() != name) break; | |
| 1020 if (m->signature() == signature) return m; | |
| 1021 } | |
| 1022 // search upwards | |
| 1023 for (i = mid + 1; i <= h; i++) { | |
| 1024 methodOop m = (methodOop)methods->obj_at(i); | |
| 1025 assert(m->is_method(), "must be method"); | |
| 1026 if (m->name() != name) break; | |
| 1027 if (m->signature() == signature) return m; | |
| 1028 } | |
| 1029 // not found | |
| 1030 #ifdef ASSERT | |
| 1031 int index = linear_search(methods, name, signature); | |
|
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1032 assert(index == -1, err_msg("binary search should have found entry %d", index)); |
| 0 | 1033 #endif |
| 1034 return NULL; | |
| 1035 } else if (res < 0) { | |
| 1036 l = mid + 1; | |
| 1037 } else { | |
| 1038 h = mid - 1; | |
| 1039 } | |
| 1040 } | |
| 1041 #ifdef ASSERT | |
| 1042 int index = linear_search(methods, name, signature); | |
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1043 assert(index == -1, err_msg("binary search should have found entry %d", index)); |
| 0 | 1044 #endif |
| 1045 return NULL; | |
| 1046 } | |
| 1047 | |
|
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1048 methodOop instanceKlass::uncached_lookup_method(Symbol* name, Symbol* signature) const { |
| 0 | 1049 klassOop klass = as_klassOop(); |
| 1050 while (klass != NULL) { | |
| 1051 methodOop method = instanceKlass::cast(klass)->find_method(name, signature); | |
| 1052 if (method != NULL) return method; | |
| 1053 klass = instanceKlass::cast(klass)->super(); | |
| 1054 } | |
| 1055 return NULL; | |
| 1056 } | |
| 1057 | |
| 1058 // lookup a method in all the interfaces that this class implements | |
|
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1059 methodOop instanceKlass::lookup_method_in_all_interfaces(Symbol* name, |
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1060 Symbol* signature) const { |
| 0 | 1061 objArrayOop all_ifs = instanceKlass::cast(as_klassOop())->transitive_interfaces(); |
| 1062 int num_ifs = all_ifs->length(); | |
| 1063 instanceKlass *ik = NULL; | |
| 1064 for (int i = 0; i < num_ifs; i++) { | |
| 1065 ik = instanceKlass::cast(klassOop(all_ifs->obj_at(i))); | |
| 1066 methodOop m = ik->lookup_method(name, signature); | |
| 1067 if (m != NULL) { | |
| 1068 return m; | |
| 1069 } | |
| 1070 } | |
| 1071 return NULL; | |
| 1072 } | |
| 1073 | |
| 1074 /* jni_id_for_impl for jfieldIds only */ | |
| 1075 JNIid* instanceKlass::jni_id_for_impl(instanceKlassHandle this_oop, int offset) { | |
| 1076 MutexLocker ml(JfieldIdCreation_lock); | |
| 1077 // Retry lookup after we got the lock | |
| 1078 JNIid* probe = this_oop->jni_ids() == NULL ? NULL : this_oop->jni_ids()->find(offset); | |
| 1079 if (probe == NULL) { | |
| 1080 // Slow case, allocate new static field identifier | |
| 1081 probe = new JNIid(this_oop->as_klassOop(), offset, this_oop->jni_ids()); | |
| 1082 this_oop->set_jni_ids(probe); | |
| 1083 } | |
| 1084 return probe; | |
| 1085 } | |
| 1086 | |
| 1087 | |
| 1088 /* jni_id_for for jfieldIds only */ | |
| 1089 JNIid* instanceKlass::jni_id_for(int offset) { | |
| 1090 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset); | |
| 1091 if (probe == NULL) { | |
| 1092 probe = jni_id_for_impl(this->as_klassOop(), offset); | |
| 1093 } | |
| 1094 return probe; | |
| 1095 } | |
| 1096 | |
| 1097 | |
| 1098 // Lookup or create a jmethodID. | |
|
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1099 // This code is called by the VMThread and JavaThreads so the |
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1100 // locking has to be done very carefully to avoid deadlocks |
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1101 // and/or other cache consistency problems. |
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1102 // |
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1103 jmethodID instanceKlass::get_jmethod_id(instanceKlassHandle ik_h, methodHandle method_h) { |
| 0 | 1104 size_t idnum = (size_t)method_h->method_idnum(); |
| 1105 jmethodID* jmeths = ik_h->methods_jmethod_ids_acquire(); | |
| 1106 size_t length = 0; | |
| 1107 jmethodID id = NULL; | |
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1108 |
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1109 // We use a double-check locking idiom here because this cache is |
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1110 // performance sensitive. In the normal system, this cache only |
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1111 // transitions from NULL to non-NULL which is safe because we use |
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1112 // release_set_methods_jmethod_ids() to advertise the new cache. |
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1113 // A partially constructed cache should never be seen by a racing |
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1114 // thread. We also use release_store_ptr() to save a new jmethodID |
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1115 // in the cache so a partially constructed jmethodID should never be |
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1116 // seen either. Cache reads of existing jmethodIDs proceed without a |
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1117 // lock, but cache writes of a new jmethodID requires uniqueness and |
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1118 // creation of the cache itself requires no leaks so a lock is |
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1119 // generally acquired in those two cases. |
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1120 // |
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1121 // If the RedefineClasses() API has been used, then this cache can |
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1122 // grow and we'll have transitions from non-NULL to bigger non-NULL. |
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1123 // Cache creation requires no leaks and we require safety between all |
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1124 // cache accesses and freeing of the old cache so a lock is generally |
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1125 // acquired when the RedefineClasses() API has been used. |
| 0 | 1126 |
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1127 if (jmeths != NULL) { |
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1128 // the cache already exists |
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1129 if (!ik_h->idnum_can_increment()) { |
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1130 // the cache can't grow so we can just get the current values |
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1131 get_jmethod_id_length_value(jmeths, idnum, &length, &id); |
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1132 } else { |
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1133 // cache can grow so we have to be more careful |
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1134 if (Threads::number_of_threads() == 0 || |
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1135 SafepointSynchronize::is_at_safepoint()) { |
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1136 // we're single threaded or at a safepoint - no locking needed |
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1137 get_jmethod_id_length_value(jmeths, idnum, &length, &id); |
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1138 } else { |
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1139 MutexLocker ml(JmethodIdCreation_lock); |
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1140 get_jmethod_id_length_value(jmeths, idnum, &length, &id); |
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1141 } |
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1142 } |
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1143 } |
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1144 // implied else: |
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1145 // we need to allocate a cache so default length and id values are good |
| 0 | 1146 |
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1147 if (jmeths == NULL || // no cache yet |
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1148 length <= idnum || // cache is too short |
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1149 id == NULL) { // cache doesn't contain entry |
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1150 |
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1151 // This function can be called by the VMThread so we have to do all |
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1152 // things that might block on a safepoint before grabbing the lock. |
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1153 // Otherwise, we can deadlock with the VMThread or have a cache |
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1154 // consistency issue. These vars keep track of what we might have |
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1155 // to free after the lock is dropped. |
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1156 jmethodID to_dealloc_id = NULL; |
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1157 jmethodID* to_dealloc_jmeths = NULL; |
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1158 |
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1159 // may not allocate new_jmeths or use it if we allocate it |
| 0 | 1160 jmethodID* new_jmeths = NULL; |
| 1161 if (length <= idnum) { | |
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1162 // allocate a new cache that might be used |
| 0 | 1163 size_t size = MAX2(idnum+1, (size_t)ik_h->idnum_allocated_count()); |
| 1164 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1); | |
| 1165 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID)); | |
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1166 // cache size is stored in element[0], other elements offset by one |
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1167 new_jmeths[0] = (jmethodID)size; |
| 0 | 1168 } |
| 1169 | |
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1170 // allocate a new jmethodID that might be used |
| 0 | 1171 jmethodID new_id = NULL; |
| 1172 if (method_h->is_old() && !method_h->is_obsolete()) { | |
| 1173 // The method passed in is old (but not obsolete), we need to use the current version | |
| 1174 methodOop current_method = ik_h->method_with_idnum((int)idnum); | |
| 1175 assert(current_method != NULL, "old and but not obsolete, so should exist"); | |
| 1176 methodHandle current_method_h(current_method == NULL? method_h() : current_method); | |
| 1177 new_id = JNIHandles::make_jmethod_id(current_method_h); | |
| 1178 } else { | |
| 1179 // It is the current version of the method or an obsolete method, | |
| 1180 // use the version passed in | |
| 1181 new_id = JNIHandles::make_jmethod_id(method_h); | |
| 1182 } | |
| 1183 | |
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1184 if (Threads::number_of_threads() == 0 || |
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1185 SafepointSynchronize::is_at_safepoint()) { |
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1186 // we're single threaded or at a safepoint - no locking needed |
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1187 id = get_jmethod_id_fetch_or_update(ik_h, idnum, new_id, new_jmeths, |
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1188 &to_dealloc_id, &to_dealloc_jmeths); |
|
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1189 } else { |
| 0 | 1190 MutexLocker ml(JmethodIdCreation_lock); |
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1191 id = get_jmethod_id_fetch_or_update(ik_h, idnum, new_id, new_jmeths, |
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1192 &to_dealloc_id, &to_dealloc_jmeths); |
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1193 } |
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1194 |
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1195 // The lock has been dropped so we can free resources. |
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1196 // Free up either the old cache or the new cache if we allocated one. |
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1197 if (to_dealloc_jmeths != NULL) { |
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1198 FreeHeap(to_dealloc_jmeths); |
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1199 } |
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1200 // free up the new ID since it wasn't needed |
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1201 if (to_dealloc_id != NULL) { |
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1202 JNIHandles::destroy_jmethod_id(to_dealloc_id); |
|
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1203 } |
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1204 } |
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1205 return id; |
|
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1206 } |
| 0 | 1207 |
|
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1208 |
|
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1209 // Common code to fetch the jmethodID from the cache or update the |
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1210 // cache with the new jmethodID. This function should never do anything |
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1211 // that causes the caller to go to a safepoint or we can deadlock with |
|
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1212 // the VMThread or have cache consistency issues. |
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1213 // |
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1214 jmethodID instanceKlass::get_jmethod_id_fetch_or_update( |
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1215 instanceKlassHandle ik_h, size_t idnum, jmethodID new_id, |
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1216 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p, |
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1217 jmethodID** to_dealloc_jmeths_p) { |
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1218 assert(new_id != NULL, "sanity check"); |
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1219 assert(to_dealloc_id_p != NULL, "sanity check"); |
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1220 assert(to_dealloc_jmeths_p != NULL, "sanity check"); |
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1221 assert(Threads::number_of_threads() == 0 || |
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1222 SafepointSynchronize::is_at_safepoint() || |
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1223 JmethodIdCreation_lock->owned_by_self(), "sanity check"); |
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1224 |
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1225 // reacquire the cache - we are locked, single threaded or at a safepoint |
|
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1226 jmethodID* jmeths = ik_h->methods_jmethod_ids_acquire(); |
|
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1227 jmethodID id = NULL; |
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1228 size_t length = 0; |
| 0 | 1229 |
|
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1230 if (jmeths == NULL || // no cache yet |
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1231 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short |
|
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1232 if (jmeths != NULL) { |
|
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1233 // copy any existing entries from the old cache |
|
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1234 for (size_t index = 0; index < length; index++) { |
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1235 new_jmeths[index+1] = jmeths[index+1]; |
| 0 | 1236 } |
|
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1237 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete |
| 0 | 1238 } |
|
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1239 ik_h->release_set_methods_jmethod_ids(jmeths = new_jmeths); |
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1240 } else { |
|
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1241 // fetch jmethodID (if any) from the existing cache |
|
49
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1242 id = jmeths[idnum+1]; |
|
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1243 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete |
|
49
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1244 } |
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1245 if (id == NULL) { |
|
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1246 // No matching jmethodID in the existing cache or we have a new |
|
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1247 // cache or we just grew the cache. This cache write is done here |
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1248 // by the first thread to win the foot race because a jmethodID |
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1249 // needs to be unique once it is generally available. |
|
49
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1250 id = new_id; |
|
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1251 |
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1252 // The jmethodID cache can be read while unlocked so we have to |
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1253 // make sure the new jmethodID is complete before installing it |
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1254 // in the cache. |
|
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1255 OrderAccess::release_store_ptr(&jmeths[idnum+1], id); |
|
49
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1256 } else { |
|
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1257 *to_dealloc_id_p = new_id; // save new id for later delete |
| 0 | 1258 } |
| 1259 return id; | |
| 1260 } | |
| 1261 | |
| 1262 | |
|
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1263 // Common code to get the jmethodID cache length and the jmethodID |
|
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1264 // value at index idnum if there is one. |
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1265 // |
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1266 void instanceKlass::get_jmethod_id_length_value(jmethodID* cache, |
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1267 size_t idnum, size_t *length_p, jmethodID* id_p) { |
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1268 assert(cache != NULL, "sanity check"); |
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1269 assert(length_p != NULL, "sanity check"); |
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1270 assert(id_p != NULL, "sanity check"); |
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1271 |
|
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1272 // cache size is stored in element[0], other elements offset by one |
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1273 *length_p = (size_t)cache[0]; |
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1274 if (*length_p <= idnum) { // cache is too short |
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1275 *id_p = NULL; |
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1276 } else { |
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1277 *id_p = cache[idnum+1]; // fetch jmethodID (if any) |
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1278 } |
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1279 } |
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1280 |
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1281 |
| 0 | 1282 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles |
| 1283 jmethodID instanceKlass::jmethod_id_or_null(methodOop method) { | |
| 1284 size_t idnum = (size_t)method->method_idnum(); | |
| 1285 jmethodID* jmeths = methods_jmethod_ids_acquire(); | |
| 1286 size_t length; // length assigned as debugging crumb | |
| 1287 jmethodID id = NULL; | |
|
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1288 if (jmeths != NULL && // If there is a cache |
| 0 | 1289 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough, |
| 1290 id = jmeths[idnum+1]; // Look up the id (may be NULL) | |
| 1291 } | |
| 1292 return id; | |
| 1293 } | |
| 1294 | |
| 1295 | |
| 1296 // Cache an itable index | |
| 1297 void instanceKlass::set_cached_itable_index(size_t idnum, int index) { | |
| 1298 int* indices = methods_cached_itable_indices_acquire(); | |
|
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1299 int* to_dealloc_indices = NULL; |
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1300 |
|
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1301 // We use a double-check locking idiom here because this cache is |
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1302 // performance sensitive. In the normal system, this cache only |
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1303 // transitions from NULL to non-NULL which is safe because we use |
|
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1304 // release_set_methods_cached_itable_indices() to advertise the |
|
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1305 // new cache. A partially constructed cache should never be seen |
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1306 // by a racing thread. Cache reads and writes proceed without a |
|
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1307 // lock, but creation of the cache itself requires no leaks so a |
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1308 // lock is generally acquired in that case. |
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1309 // |
|
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1310 // If the RedefineClasses() API has been used, then this cache can |
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1311 // grow and we'll have transitions from non-NULL to bigger non-NULL. |
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1312 // Cache creation requires no leaks and we require safety between all |
|
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1313 // cache accesses and freeing of the old cache so a lock is generally |
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1314 // acquired when the RedefineClasses() API has been used. |
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1315 |
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1316 if (indices == NULL || idnum_can_increment()) { |
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1317 // we need a cache or the cache can grow |
| 0 | 1318 MutexLocker ml(JNICachedItableIndex_lock); |
|
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1319 // reacquire the cache to see if another thread already did the work |
| 0 | 1320 indices = methods_cached_itable_indices_acquire(); |
| 1321 size_t length = 0; | |
|
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1322 // cache size is stored in element[0], other elements offset by one |
| 0 | 1323 if (indices == NULL || (length = (size_t)indices[0]) <= idnum) { |
| 1324 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count()); | |
| 1325 int* new_indices = NEW_C_HEAP_ARRAY(int, size+1); | |
|
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1326 new_indices[0] = (int)size; |
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1327 // copy any existing entries |
| 0 | 1328 size_t i; |
| 1329 for (i = 0; i < length; i++) { | |
| 1330 new_indices[i+1] = indices[i+1]; | |
| 1331 } | |
| 1332 // Set all the rest to -1 | |
| 1333 for (i = length; i < size; i++) { | |
| 1334 new_indices[i+1] = -1; | |
| 1335 } | |
| 1336 if (indices != NULL) { | |
|
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1337 // We have an old cache to delete so save it for after we |
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1338 // drop the lock. |
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1339 to_dealloc_indices = indices; |
| 0 | 1340 } |
| 1341 release_set_methods_cached_itable_indices(indices = new_indices); | |
| 1342 } | |
|
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1343 |
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1344 if (idnum_can_increment()) { |
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1345 // this cache can grow so we have to write to it safely |
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1346 indices[idnum+1] = index; |
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1347 } |
| 0 | 1348 } else { |
| 1349 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); | |
| 1350 } | |
|
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1351 |
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1352 if (!idnum_can_increment()) { |
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1353 // The cache cannot grow and this JNI itable index value does not |
|
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1354 // have to be unique like a jmethodID. If there is a race to set it, |
|
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1355 // it doesn't matter. |
|
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1356 indices[idnum+1] = index; |
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1357 } |
|
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1358 |
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1359 if (to_dealloc_indices != NULL) { |
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1360 // we allocated a new cache so free the old one |
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1361 FreeHeap(to_dealloc_indices); |
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1362 } |
| 0 | 1363 } |
| 1364 | |
| 1365 | |
| 1366 // Retrieve a cached itable index | |
| 1367 int instanceKlass::cached_itable_index(size_t idnum) { | |
| 1368 int* indices = methods_cached_itable_indices_acquire(); | |
| 1369 if (indices != NULL && ((size_t)indices[0]) > idnum) { | |
| 1370 // indices exist and are long enough, retrieve possible cached | |
| 1371 return indices[idnum+1]; | |
| 1372 } | |
| 1373 return -1; | |
| 1374 } | |
| 1375 | |
| 1376 | |
| 1377 // | |
| 1378 // Walk the list of dependent nmethods searching for nmethods which | |
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1379 // are dependent on the changes that were passed in and mark them for |
| 0 | 1380 // deoptimization. Returns the number of nmethods found. |
| 1381 // | |
| 1382 int instanceKlass::mark_dependent_nmethods(DepChange& changes) { | |
| 1383 assert_locked_or_safepoint(CodeCache_lock); | |
| 1384 int found = 0; | |
| 1385 nmethodBucket* b = _dependencies; | |
| 1386 while (b != NULL) { | |
| 1387 nmethod* nm = b->get_nmethod(); | |
| 1388 // since dependencies aren't removed until an nmethod becomes a zombie, | |
| 1389 // the dependency list may contain nmethods which aren't alive. | |
| 1390 if (nm->is_alive() && !nm->is_marked_for_deoptimization() && nm->check_dependency_on(changes)) { | |
| 1391 if (TraceDependencies) { | |
| 1392 ResourceMark rm; | |
| 1393 tty->print_cr("Marked for deoptimization"); | |
| 1394 tty->print_cr(" context = %s", this->external_name()); | |
| 1395 changes.print(); | |
| 1396 nm->print(); | |
| 1397 nm->print_dependencies(); | |
| 1398 } | |
| 1399 nm->mark_for_deoptimization(); | |
| 1400 found++; | |
| 1401 } | |
| 1402 b = b->next(); | |
| 1403 } | |
| 1404 return found; | |
| 1405 } | |
| 1406 | |
| 1407 | |
| 1408 // | |
| 1409 // Add an nmethodBucket to the list of dependencies for this nmethod. | |
| 1410 // It's possible that an nmethod has multiple dependencies on this klass | |
| 1411 // so a count is kept for each bucket to guarantee that creation and | |
| 1412 // deletion of dependencies is consistent. | |
| 1413 // | |
| 1414 void instanceKlass::add_dependent_nmethod(nmethod* nm) { | |
| 1415 assert_locked_or_safepoint(CodeCache_lock); | |
| 1416 nmethodBucket* b = _dependencies; | |
| 1417 nmethodBucket* last = NULL; | |
| 1418 while (b != NULL) { | |
| 1419 if (nm == b->get_nmethod()) { | |
| 1420 b->increment(); | |
| 1421 return; | |
| 1422 } | |
| 1423 b = b->next(); | |
| 1424 } | |
| 1425 _dependencies = new nmethodBucket(nm, _dependencies); | |
| 1426 } | |
| 1427 | |
| 1428 | |
| 1429 // | |
| 1430 // Decrement count of the nmethod in the dependency list and remove | |
| 1431 // the bucket competely when the count goes to 0. This method must | |
| 1432 // find a corresponding bucket otherwise there's a bug in the | |
| 1433 // recording of dependecies. | |
| 1434 // | |
| 1435 void instanceKlass::remove_dependent_nmethod(nmethod* nm) { | |
| 1436 assert_locked_or_safepoint(CodeCache_lock); | |
| 1437 nmethodBucket* b = _dependencies; | |
| 1438 nmethodBucket* last = NULL; | |
| 1439 while (b != NULL) { | |
| 1440 if (nm == b->get_nmethod()) { | |
| 1441 if (b->decrement() == 0) { | |
| 1442 if (last == NULL) { | |
| 1443 _dependencies = b->next(); | |
| 1444 } else { | |
| 1445 last->set_next(b->next()); | |
| 1446 } | |
| 1447 delete b; | |
| 1448 } | |
| 1449 return; | |
| 1450 } | |
| 1451 last = b; | |
| 1452 b = b->next(); | |
| 1453 } | |
| 1454 #ifdef ASSERT | |
| 1455 tty->print_cr("### %s can't find dependent nmethod:", this->external_name()); | |
| 1456 nm->print(); | |
| 1457 #endif // ASSERT | |
| 1458 ShouldNotReachHere(); | |
| 1459 } | |
| 1460 | |
| 1461 | |
| 1462 #ifndef PRODUCT | |
| 1463 void instanceKlass::print_dependent_nmethods(bool verbose) { | |
| 1464 nmethodBucket* b = _dependencies; | |
| 1465 int idx = 0; | |
| 1466 while (b != NULL) { | |
| 1467 nmethod* nm = b->get_nmethod(); | |
| 1468 tty->print("[%d] count=%d { ", idx++, b->count()); | |
| 1469 if (!verbose) { | |
| 1470 nm->print_on(tty, "nmethod"); | |
| 1471 tty->print_cr(" } "); | |
| 1472 } else { | |
| 1473 nm->print(); | |
| 1474 nm->print_dependencies(); | |
| 1475 tty->print_cr("--- } "); | |
| 1476 } | |
| 1477 b = b->next(); | |
| 1478 } | |
| 1479 } | |
| 1480 | |
| 1481 | |
| 1482 bool instanceKlass::is_dependent_nmethod(nmethod* nm) { | |
| 1483 nmethodBucket* b = _dependencies; | |
| 1484 while (b != NULL) { | |
| 1485 if (nm == b->get_nmethod()) { | |
| 1486 return true; | |
| 1487 } | |
| 1488 b = b->next(); | |
| 1489 } | |
| 1490 return false; | |
| 1491 } | |
| 1492 #endif //PRODUCT | |
| 1493 | |
| 1494 | |
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1495 #ifdef ASSERT |
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1496 template <class T> void assert_is_in(T *p) { |
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1497 T heap_oop = oopDesc::load_heap_oop(p); |
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1498 if (!oopDesc::is_null(heap_oop)) { |
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1499 oop o = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1500 assert(Universe::heap()->is_in(o), "should be in heap"); |
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1501 } |
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1502 } |
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1503 template <class T> void assert_is_in_closed_subset(T *p) { |
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1504 T heap_oop = oopDesc::load_heap_oop(p); |
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1505 if (!oopDesc::is_null(heap_oop)) { |
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1506 oop o = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1507 assert(Universe::heap()->is_in_closed_subset(o), "should be in closed"); |
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1508 } |
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1509 } |
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1510 template <class T> void assert_is_in_reserved(T *p) { |
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1511 T heap_oop = oopDesc::load_heap_oop(p); |
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1512 if (!oopDesc::is_null(heap_oop)) { |
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1513 oop o = oopDesc::decode_heap_oop_not_null(heap_oop); |
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1514 assert(Universe::heap()->is_in_reserved(o), "should be in reserved"); |
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1515 } |
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1516 } |
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1517 template <class T> void assert_nothing(T *p) {} |
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1518 |
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1519 #else |
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1520 template <class T> void assert_is_in(T *p) {} |
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1521 template <class T> void assert_is_in_closed_subset(T *p) {} |
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1522 template <class T> void assert_is_in_reserved(T *p) {} |
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1523 template <class T> void assert_nothing(T *p) {} |
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1524 #endif // ASSERT |
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1525 |
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1526 // |
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1527 // Macros that iterate over areas of oops which are specialized on type of |
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1528 // oop pointer either narrow or wide, depending on UseCompressedOops |
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1529 // |
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1530 // Parameters are: |
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1531 // T - type of oop to point to (either oop or narrowOop) |
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1532 // start_p - starting pointer for region to iterate over |
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1533 // count - number of oops or narrowOops to iterate over |
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1534 // do_oop - action to perform on each oop (it's arbitrary C code which |
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1535 // makes it more efficient to put in a macro rather than making |
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1536 // it a template function) |
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1537 // assert_fn - assert function which is template function because performance |
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1538 // doesn't matter when enabled. |
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1539 #define InstanceKlass_SPECIALIZED_OOP_ITERATE( \ |
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1540 T, start_p, count, do_oop, \ |
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1541 assert_fn) \ |
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1542 { \ |
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1543 T* p = (T*)(start_p); \ |
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1544 T* const end = p + (count); \ |
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1545 while (p < end) { \ |
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1546 (assert_fn)(p); \ |
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1547 do_oop; \ |
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1548 ++p; \ |
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1549 } \ |
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1550 } |
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1551 |
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1552 #define InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE( \ |
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1553 T, start_p, count, do_oop, \ |
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1554 assert_fn) \ |
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1555 { \ |
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1556 T* const start = (T*)(start_p); \ |
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1557 T* p = start + (count); \ |
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1558 while (start < p) { \ |
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1559 --p; \ |
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1560 (assert_fn)(p); \ |
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1561 do_oop; \ |
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1562 } \ |
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1563 } |
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1564 |
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1565 #define InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE( \ |
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1566 T, start_p, count, low, high, \ |
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1567 do_oop, assert_fn) \ |
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1568 { \ |
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1569 T* const l = (T*)(low); \ |
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1570 T* const h = (T*)(high); \ |
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1571 assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 && \ |
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1572 mask_bits((intptr_t)h, sizeof(T)-1) == 0, \ |
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1573 "bounded region must be properly aligned"); \ |
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1574 T* p = (T*)(start_p); \ |
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1575 T* end = p + (count); \ |
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1576 if (p < l) p = l; \ |
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1577 if (end > h) end = h; \ |
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1578 while (p < end) { \ |
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1579 (assert_fn)(p); \ |
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1580 do_oop; \ |
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1581 ++p; \ |
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1582 } \ |
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1583 } |
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1584 |
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1585 |
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1586 // The following macros call specialized macros, passing either oop or |
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1587 // narrowOop as the specialization type. These test the UseCompressedOops |
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1588 // flag. |
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1589 #define InstanceKlass_OOP_MAP_ITERATE(obj, do_oop, assert_fn) \ |
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1590 { \ |
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1591 /* Compute oopmap block range. The common case \ |
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1592 is nonstatic_oop_map_size == 1. */ \ |
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1593 OopMapBlock* map = start_of_nonstatic_oop_maps(); \ |
| 938 | 1594 OopMapBlock* const end_map = map + nonstatic_oop_map_count(); \ |
|
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1595 if (UseCompressedOops) { \ |
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1596 while (map < end_map) { \ |
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1597 InstanceKlass_SPECIALIZED_OOP_ITERATE(narrowOop, \ |
| 938 | 1598 obj->obj_field_addr<narrowOop>(map->offset()), map->count(), \ |
|
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1599 do_oop, assert_fn) \ |
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1600 ++map; \ |
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1601 } \ |
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1602 } else { \ |
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1603 while (map < end_map) { \ |
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1604 InstanceKlass_SPECIALIZED_OOP_ITERATE(oop, \ |
| 938 | 1605 obj->obj_field_addr<oop>(map->offset()), map->count(), \ |
|
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1606 do_oop, assert_fn) \ |
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1607 ++map; \ |
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1608 } \ |
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1609 } \ |
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1610 } |
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1611 |
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1612 #define InstanceKlass_OOP_MAP_REVERSE_ITERATE(obj, do_oop, assert_fn) \ |
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1613 { \ |
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1614 OopMapBlock* const start_map = start_of_nonstatic_oop_maps(); \ |
| 938 | 1615 OopMapBlock* map = start_map + nonstatic_oop_map_count(); \ |
|
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1616 if (UseCompressedOops) { \ |
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1617 while (start_map < map) { \ |
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1618 --map; \ |
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1619 InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE(narrowOop, \ |
| 938 | 1620 obj->obj_field_addr<narrowOop>(map->offset()), map->count(), \ |
|
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1621 do_oop, assert_fn) \ |
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1622 } \ |
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1623 } else { \ |
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1624 while (start_map < map) { \ |
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1625 --map; \ |
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1626 InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE(oop, \ |
| 938 | 1627 obj->obj_field_addr<oop>(map->offset()), map->count(), \ |
|
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1628 do_oop, assert_fn) \ |
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1629 } \ |
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1630 } \ |
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1631 } |
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1632 |
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1633 #define InstanceKlass_BOUNDED_OOP_MAP_ITERATE(obj, low, high, do_oop, \ |
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1634 assert_fn) \ |
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1635 { \ |
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1636 /* Compute oopmap block range. The common case is \ |
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1637 nonstatic_oop_map_size == 1, so we accept the \ |
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1638 usually non-existent extra overhead of examining \ |
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1639 all the maps. */ \ |
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1640 OopMapBlock* map = start_of_nonstatic_oop_maps(); \ |
| 938 | 1641 OopMapBlock* const end_map = map + nonstatic_oop_map_count(); \ |
|
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1642 if (UseCompressedOops) { \ |
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1643 while (map < end_map) { \ |
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1644 InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(narrowOop, \ |
| 938 | 1645 obj->obj_field_addr<narrowOop>(map->offset()), map->count(), \ |
|
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1646 low, high, \ |
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1647 do_oop, assert_fn) \ |
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1648 ++map; \ |
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1649 } \ |
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1650 } else { \ |
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1651 while (map < end_map) { \ |
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1652 InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(oop, \ |
| 938 | 1653 obj->obj_field_addr<oop>(map->offset()), map->count(), \ |
|
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1654 low, high, \ |
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1655 do_oop, assert_fn) \ |
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1656 ++map; \ |
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1657 } \ |
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1658 } \ |
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1659 } |
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1660 |
| 0 | 1661 void instanceKlass::oop_follow_contents(oop obj) { |
|
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1662 assert(obj != NULL, "can't follow the content of NULL object"); |
| 0 | 1663 obj->follow_header(); |
|
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1664 InstanceKlass_OOP_MAP_ITERATE( \ |
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1665 obj, \ |
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1666 MarkSweep::mark_and_push(p), \ |
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1667 assert_is_in_closed_subset) |
| 0 | 1668 } |
| 1669 | |
| 1670 #ifndef SERIALGC | |
| 1671 void instanceKlass::oop_follow_contents(ParCompactionManager* cm, | |
| 1672 oop obj) { | |
|
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1673 assert(obj != NULL, "can't follow the content of NULL object"); |
| 0 | 1674 obj->follow_header(cm); |
|
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1675 InstanceKlass_OOP_MAP_ITERATE( \ |
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1676 obj, \ |
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1677 PSParallelCompact::mark_and_push(cm, p), \ |
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1678 assert_is_in) |
| 0 | 1679 } |
| 1680 #endif // SERIALGC | |
| 1681 | |
| 1682 // closure's do_header() method dicates whether the given closure should be | |
| 1683 // applied to the klass ptr in the object header. | |
| 1684 | |
|
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1685 #define InstanceKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ |
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1686 \ |
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1687 int instanceKlass::oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \ |
|
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1688 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik);\ |
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1689 /* header */ \ |
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1690 if (closure->do_header()) { \ |
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1691 obj->oop_iterate_header(closure); \ |
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1692 } \ |
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1693 InstanceKlass_OOP_MAP_ITERATE( \ |
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1694 obj, \ |
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1695 SpecializationStats:: \ |
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1696 record_do_oop_call##nv_suffix(SpecializationStats::ik); \ |
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1697 (closure)->do_oop##nv_suffix(p), \ |
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1698 assert_is_in_closed_subset) \ |
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1699 return size_helper(); \ |
| 0 | 1700 } |
| 1701 | |
|
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1702 #ifndef SERIALGC |
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1703 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \ |
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1704 \ |
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1705 int instanceKlass::oop_oop_iterate_backwards##nv_suffix(oop obj, \ |
|
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1706 OopClosureType* closure) { \ |
|
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1707 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik); \ |
|
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1708 /* header */ \ |
|
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1709 if (closure->do_header()) { \ |
|
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1710 obj->oop_iterate_header(closure); \ |
|
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1711 } \ |
|
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1712 /* instance variables */ \ |
|
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1713 InstanceKlass_OOP_MAP_REVERSE_ITERATE( \ |
|
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1714 obj, \ |
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1715 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::ik);\ |
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1716 (closure)->do_oop##nv_suffix(p), \ |
|
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1717 assert_is_in_closed_subset) \ |
|
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1718 return size_helper(); \ |
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1719 } |
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1720 #endif // !SERIALGC |
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1721 |
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1722 #define InstanceKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \ |
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1723 \ |
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1724 int instanceKlass::oop_oop_iterate##nv_suffix##_m(oop obj, \ |
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1725 OopClosureType* closure, \ |
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1726 MemRegion mr) { \ |
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1727 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik);\ |
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1728 if (closure->do_header()) { \ |
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1729 obj->oop_iterate_header(closure, mr); \ |
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1730 } \ |
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1731 InstanceKlass_BOUNDED_OOP_MAP_ITERATE( \ |
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1732 obj, mr.start(), mr.end(), \ |
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1733 (closure)->do_oop##nv_suffix(p), \ |
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1734 assert_is_in_closed_subset) \ |
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1735 return size_helper(); \ |
| 0 | 1736 } |
| 1737 | |
| 1738 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DEFN) | |
|
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1739 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DEFN) |
| 0 | 1740 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DEFN_m) |
|
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1741 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DEFN_m) |
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1742 #ifndef SERIALGC |
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1743 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN) |
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1744 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN) |
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1745 #endif // !SERIALGC |
| 0 | 1746 |
| 1747 int instanceKlass::oop_adjust_pointers(oop obj) { | |
| 1748 int size = size_helper(); | |
|
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1749 InstanceKlass_OOP_MAP_ITERATE( \ |
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1750 obj, \ |
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1751 MarkSweep::adjust_pointer(p), \ |
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1752 assert_is_in) |
| 0 | 1753 obj->adjust_header(); |
| 1754 return size; | |
| 1755 } | |
| 1756 | |
| 1757 #ifndef SERIALGC | |
| 1758 void instanceKlass::oop_push_contents(PSPromotionManager* pm, oop obj) { | |
|
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1759 InstanceKlass_OOP_MAP_REVERSE_ITERATE( \ |
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1760 obj, \ |
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1761 if (PSScavenge::should_scavenge(p)) { \ |
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1762 pm->claim_or_forward_depth(p); \ |
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1763 }, \ |
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1764 assert_nothing ) |
| 0 | 1765 } |
| 1766 | |
| 1767 int instanceKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) { | |
|
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1768 InstanceKlass_OOP_MAP_ITERATE( \ |
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1769 obj, \ |
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1770 PSParallelCompact::adjust_pointer(p), \ |
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1771 assert_nothing) |
| 0 | 1772 return size_helper(); |
| 1773 } | |
| 1774 | |
| 1775 #endif // SERIALGC | |
| 1776 | |
| 1777 // This klass is alive but the implementor link is not followed/updated. | |
| 1778 // Subklass and sibling links are handled by Klass::follow_weak_klass_links | |
| 1779 | |
| 1780 void instanceKlass::follow_weak_klass_links( | |
| 1781 BoolObjectClosure* is_alive, OopClosure* keep_alive) { | |
| 1782 assert(is_alive->do_object_b(as_klassOop()), "this oop should be live"); | |
| 1783 if (ClassUnloading) { | |
| 1784 for (int i = 0; i < implementors_limit; i++) { | |
| 1785 klassOop impl = _implementors[i]; | |
| 1786 if (impl == NULL) break; // no more in the list | |
| 1787 if (!is_alive->do_object_b(impl)) { | |
| 1788 // remove this guy from the list by overwriting him with the tail | |
| 1789 int lasti = --_nof_implementors; | |
| 1790 assert(lasti >= i && lasti < implementors_limit, "just checking"); | |
| 1791 _implementors[i] = _implementors[lasti]; | |
| 1792 _implementors[lasti] = NULL; | |
| 1793 --i; // rerun the loop at this index | |
| 1794 } | |
| 1795 } | |
| 1796 } else { | |
| 1797 for (int i = 0; i < implementors_limit; i++) { | |
| 1798 keep_alive->do_oop(&adr_implementors()[i]); | |
| 1799 } | |
| 1800 } | |
| 1801 Klass::follow_weak_klass_links(is_alive, keep_alive); | |
| 1802 } | |
| 1803 | |
| 1804 void instanceKlass::remove_unshareable_info() { | |
| 1805 Klass::remove_unshareable_info(); | |
| 1806 init_implementor(); | |
| 1807 } | |
| 1808 | |
| 1809 static void clear_all_breakpoints(methodOop m) { | |
| 1810 m->clear_all_breakpoints(); | |
| 1811 } | |
| 1812 | |
| 1813 void instanceKlass::release_C_heap_structures() { | |
| 1814 // Deallocate oop map cache | |
| 1815 if (_oop_map_cache != NULL) { | |
| 1816 delete _oop_map_cache; | |
| 1817 _oop_map_cache = NULL; | |
| 1818 } | |
| 1819 | |
| 1820 // Deallocate JNI identifiers for jfieldIDs | |
| 1821 JNIid::deallocate(jni_ids()); | |
| 1822 set_jni_ids(NULL); | |
| 1823 | |
| 1824 jmethodID* jmeths = methods_jmethod_ids_acquire(); | |
| 1825 if (jmeths != (jmethodID*)NULL) { | |
| 1826 release_set_methods_jmethod_ids(NULL); | |
| 1827 FreeHeap(jmeths); | |
| 1828 } | |
| 1829 | |
| 1830 int* indices = methods_cached_itable_indices_acquire(); | |
| 1831 if (indices != (int*)NULL) { | |
| 1832 release_set_methods_cached_itable_indices(NULL); | |
| 1833 FreeHeap(indices); | |
| 1834 } | |
| 1835 | |
| 1836 // release dependencies | |
| 1837 nmethodBucket* b = _dependencies; | |
| 1838 _dependencies = NULL; | |
| 1839 while (b != NULL) { | |
| 1840 nmethodBucket* next = b->next(); | |
| 1841 delete b; | |
| 1842 b = next; | |
| 1843 } | |
| 1844 | |
| 1845 // Deallocate breakpoint records | |
| 1846 if (breakpoints() != 0x0) { | |
| 1847 methods_do(clear_all_breakpoints); | |
| 1848 assert(breakpoints() == 0x0, "should have cleared breakpoints"); | |
| 1849 } | |
| 1850 | |
| 1851 // deallocate information about previous versions | |
| 1852 if (_previous_versions != NULL) { | |
| 1853 for (int i = _previous_versions->length() - 1; i >= 0; i--) { | |
| 1854 PreviousVersionNode * pv_node = _previous_versions->at(i); | |
| 1855 delete pv_node; | |
| 1856 } | |
| 1857 delete _previous_versions; | |
| 1858 _previous_versions = NULL; | |
| 1859 } | |
| 1860 | |
| 1861 // deallocate the cached class file | |
| 1862 if (_cached_class_file_bytes != NULL) { | |
| 1863 os::free(_cached_class_file_bytes); | |
| 1864 _cached_class_file_bytes = NULL; | |
| 1865 _cached_class_file_len = 0; | |
| 1866 } | |
|
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1867 |
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1868 // Decrement symbol reference counts associated with the unloaded class. |
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1869 if (_name != NULL) _name->decrement_refcount(); |
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1870 // unreference array name derived from this class name (arrays of an unloaded |
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1871 // class can't be referenced anymore). |
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1872 if (_array_name != NULL) _array_name->decrement_refcount(); |
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1873 if (_source_file_name != NULL) _source_file_name->decrement_refcount(); |
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1874 if (_source_debug_extension != NULL) _source_debug_extension->decrement_refcount(); |
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1875 // walk constant pool and decrement symbol reference counts |
|
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1876 _constants->unreference_symbols(); |
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1877 } |
|
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1878 |
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1879 void instanceKlass::set_source_file_name(Symbol* n) { |
|
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1880 _source_file_name = n; |
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1881 if (_source_file_name != NULL) _source_file_name->increment_refcount(); |
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1882 } |
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1883 |
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1884 void instanceKlass::set_source_debug_extension(Symbol* n) { |
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1885 _source_debug_extension = n; |
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1886 if (_source_debug_extension != NULL) _source_debug_extension->increment_refcount(); |
| 0 | 1887 } |
| 1888 | |
|
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1889 address instanceKlass::static_field_addr(int offset) { |
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1890 return (address)(offset + instanceMirrorKlass::offset_of_static_fields() + (intptr_t)java_mirror()); |
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1891 } |
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1892 |
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1893 |
|
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1894 const char* instanceKlass::signature_name() const { |
| 0 | 1895 const char* src = (const char*) (name()->as_C_string()); |
| 1896 const int src_length = (int)strlen(src); | |
| 1897 char* dest = NEW_RESOURCE_ARRAY(char, src_length + 3); | |
| 1898 int src_index = 0; | |
| 1899 int dest_index = 0; | |
| 1900 dest[dest_index++] = 'L'; | |
| 1901 while (src_index < src_length) { | |
| 1902 dest[dest_index++] = src[src_index++]; | |
| 1903 } | |
| 1904 dest[dest_index++] = ';'; | |
| 1905 dest[dest_index] = '\0'; | |
| 1906 return dest; | |
| 1907 } | |
| 1908 | |
| 1909 // different verisons of is_same_class_package | |
| 1910 bool instanceKlass::is_same_class_package(klassOop class2) { | |
| 1911 klassOop class1 = as_klassOop(); | |
| 1912 oop classloader1 = instanceKlass::cast(class1)->class_loader(); | |
|
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1913 Symbol* classname1 = Klass::cast(class1)->name(); |
| 0 | 1914 |
| 1915 if (Klass::cast(class2)->oop_is_objArray()) { | |
| 1916 class2 = objArrayKlass::cast(class2)->bottom_klass(); | |
| 1917 } | |
| 1918 oop classloader2; | |
| 1919 if (Klass::cast(class2)->oop_is_instance()) { | |
| 1920 classloader2 = instanceKlass::cast(class2)->class_loader(); | |
| 1921 } else { | |
| 1922 assert(Klass::cast(class2)->oop_is_typeArray(), "should be type array"); | |
| 1923 classloader2 = NULL; | |
| 1924 } | |
|
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1925 Symbol* classname2 = Klass::cast(class2)->name(); |
| 0 | 1926 |
| 1927 return instanceKlass::is_same_class_package(classloader1, classname1, | |
| 1928 classloader2, classname2); | |
| 1929 } | |
| 1930 | |
|
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1931 bool instanceKlass::is_same_class_package(oop classloader2, Symbol* classname2) { |
| 0 | 1932 klassOop class1 = as_klassOop(); |
| 1933 oop classloader1 = instanceKlass::cast(class1)->class_loader(); | |
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1934 Symbol* classname1 = Klass::cast(class1)->name(); |
| 0 | 1935 |
| 1936 return instanceKlass::is_same_class_package(classloader1, classname1, | |
| 1937 classloader2, classname2); | |
| 1938 } | |
| 1939 | |
| 1940 // return true if two classes are in the same package, classloader | |
| 1941 // and classname information is enough to determine a class's package | |
|
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1942 bool instanceKlass::is_same_class_package(oop class_loader1, Symbol* class_name1, |
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1943 oop class_loader2, Symbol* class_name2) { |
| 0 | 1944 if (class_loader1 != class_loader2) { |
| 1945 return false; | |
|
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1946 } else if (class_name1 == class_name2) { |
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1947 return true; // skip painful bytewise comparison |
| 0 | 1948 } else { |
| 1949 ResourceMark rm; | |
| 1950 | |
|
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1951 // The Symbol*'s are in UTF8 encoding. Since we only need to check explicitly |
| 0 | 1952 // for ASCII characters ('/', 'L', '['), we can keep them in UTF8 encoding. |
| 1953 // Otherwise, we just compare jbyte values between the strings. | |
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1954 const jbyte *name1 = class_name1->base(); |
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1955 const jbyte *name2 = class_name2->base(); |
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1956 |
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1957 const jbyte *last_slash1 = UTF8::strrchr(name1, class_name1->utf8_length(), '/'); |
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1958 const jbyte *last_slash2 = UTF8::strrchr(name2, class_name2->utf8_length(), '/'); |
| 0 | 1959 |
| 1960 if ((last_slash1 == NULL) || (last_slash2 == NULL)) { | |
| 1961 // One of the two doesn't have a package. Only return true | |
| 1962 // if the other one also doesn't have a package. | |
| 1963 return last_slash1 == last_slash2; | |
| 1964 } else { | |
| 1965 // Skip over '['s | |
| 1966 if (*name1 == '[') { | |
| 1967 do { | |
| 1968 name1++; | |
| 1969 } while (*name1 == '['); | |
| 1970 if (*name1 != 'L') { | |
| 1971 // Something is terribly wrong. Shouldn't be here. | |
| 1972 return false; | |
| 1973 } | |
| 1974 } | |
| 1975 if (*name2 == '[') { | |
| 1976 do { | |
| 1977 name2++; | |
| 1978 } while (*name2 == '['); | |
| 1979 if (*name2 != 'L') { | |
| 1980 // Something is terribly wrong. Shouldn't be here. | |
| 1981 return false; | |
| 1982 } | |
| 1983 } | |
| 1984 | |
| 1985 // Check that package part is identical | |
| 1986 int length1 = last_slash1 - name1; | |
| 1987 int length2 = last_slash2 - name2; | |
| 1988 | |
| 1989 return UTF8::equal(name1, length1, name2, length2); | |
| 1990 } | |
| 1991 } | |
| 1992 } | |
| 1993 | |
|
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1994 // Returns true iff super_method can be overridden by a method in targetclassname |
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1995 // See JSL 3rd edition 8.4.6.1 |
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1996 // Assumes name-signature match |
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1997 // "this" is instanceKlass of super_method which must exist |
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1998 // note that the instanceKlass of the method in the targetclassname has not always been created yet |
|
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1999 bool instanceKlass::is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) { |
|
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2000 // Private methods can not be overridden |
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2001 if (super_method->is_private()) { |
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2002 return false; |
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2003 } |
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2004 // If super method is accessible, then override |
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2005 if ((super_method->is_protected()) || |
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2006 (super_method->is_public())) { |
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2007 return true; |
|
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2008 } |
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2009 // Package-private methods are not inherited outside of package |
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2010 assert(super_method->is_package_private(), "must be package private"); |
|
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2011 return(is_same_class_package(targetclassloader(), targetclassname)); |
|
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2012 } |
| 0 | 2013 |
|
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2014 /* defined for now in jvm.cpp, for historical reasons *-- |
|
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2015 klassOop instanceKlass::compute_enclosing_class_impl(instanceKlassHandle self, |
|
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2016 Symbol*& simple_name_result, TRAPS) { |
|
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2017 ... |
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2018 } |
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2019 */ |
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2020 |
|
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2021 // tell if two classes have the same enclosing class (at package level) |
|
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2022 bool instanceKlass::is_same_package_member_impl(instanceKlassHandle class1, |
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2023 klassOop class2_oop, TRAPS) { |
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2024 if (class2_oop == class1->as_klassOop()) return true; |
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2025 if (!Klass::cast(class2_oop)->oop_is_instance()) return false; |
|
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2026 instanceKlassHandle class2(THREAD, class2_oop); |
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2027 |
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2028 // must be in same package before we try anything else |
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2029 if (!class1->is_same_class_package(class2->class_loader(), class2->name())) |
|
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2030 return false; |
|
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2031 |
|
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2032 // As long as there is an outer1.getEnclosingClass, |
|
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2033 // shift the search outward. |
|
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2034 instanceKlassHandle outer1 = class1; |
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2035 for (;;) { |
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2036 // As we walk along, look for equalities between outer1 and class2. |
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2037 // Eventually, the walks will terminate as outer1 stops |
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2038 // at the top-level class around the original class. |
|
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2039 bool ignore_inner_is_member; |
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2040 klassOop next = outer1->compute_enclosing_class(&ignore_inner_is_member, |
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2041 CHECK_false); |
|
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2042 if (next == NULL) break; |
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2043 if (next == class2()) return true; |
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2044 outer1 = instanceKlassHandle(THREAD, next); |
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2045 } |
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2046 |
|
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2047 // Now do the same for class2. |
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2048 instanceKlassHandle outer2 = class2; |
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2049 for (;;) { |
|
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2050 bool ignore_inner_is_member; |
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2051 klassOop next = outer2->compute_enclosing_class(&ignore_inner_is_member, |
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2052 CHECK_false); |
|
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2053 if (next == NULL) break; |
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2054 // Might as well check the new outer against all available values. |
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2055 if (next == class1()) return true; |
|
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2056 if (next == outer1()) return true; |
|
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2057 outer2 = instanceKlassHandle(THREAD, next); |
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2058 } |
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2059 |
|
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2060 // If by this point we have not found an equality between the |
|
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2061 // two classes, we know they are in separate package members. |
|
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2062 return false; |
|
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2063 } |
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2064 |
| 0 | 2065 |
| 2066 jint instanceKlass::compute_modifier_flags(TRAPS) const { | |
| 2067 klassOop k = as_klassOop(); | |
| 2068 jint access = access_flags().as_int(); | |
| 2069 | |
| 2070 // But check if it happens to be member class. | |
| 2071 typeArrayOop inner_class_list = inner_classes(); | |
| 2072 int length = (inner_class_list == NULL) ? 0 : inner_class_list->length(); | |
| 2073 assert (length % instanceKlass::inner_class_next_offset == 0, "just checking"); | |
| 2074 if (length > 0) { | |
| 2075 typeArrayHandle inner_class_list_h(THREAD, inner_class_list); | |
| 2076 instanceKlassHandle ik(THREAD, k); | |
| 2077 for (int i = 0; i < length; i += instanceKlass::inner_class_next_offset) { | |
| 2078 int ioff = inner_class_list_h->ushort_at( | |
| 2079 i + instanceKlass::inner_class_inner_class_info_offset); | |
| 2080 | |
| 2081 // Inner class attribute can be zero, skip it. | |
| 2082 // Strange but true: JVM spec. allows null inner class refs. | |
| 2083 if (ioff == 0) continue; | |
| 2084 | |
| 2085 // only look at classes that are already loaded | |
| 2086 // since we are looking for the flags for our self. | |
|
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2087 Symbol* inner_name = ik->constants()->klass_name_at(ioff); |
| 0 | 2088 if ((ik->name() == inner_name)) { |
| 2089 // This is really a member class. | |
| 2090 access = inner_class_list_h->ushort_at(i + instanceKlass::inner_class_access_flags_offset); | |
| 2091 break; | |
| 2092 } | |
| 2093 } | |
| 2094 } | |
| 2095 // Remember to strip ACC_SUPER bit | |
| 2096 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS; | |
| 2097 } | |
| 2098 | |
| 2099 jint instanceKlass::jvmti_class_status() const { | |
| 2100 jint result = 0; | |
| 2101 | |
| 2102 if (is_linked()) { | |
| 2103 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED; | |
| 2104 } | |
| 2105 | |
| 2106 if (is_initialized()) { | |
| 2107 assert(is_linked(), "Class status is not consistent"); | |
| 2108 result |= JVMTI_CLASS_STATUS_INITIALIZED; | |
| 2109 } | |
| 2110 if (is_in_error_state()) { | |
| 2111 result |= JVMTI_CLASS_STATUS_ERROR; | |
| 2112 } | |
| 2113 return result; | |
| 2114 } | |
| 2115 | |
| 2116 methodOop instanceKlass::method_at_itable(klassOop holder, int index, TRAPS) { | |
| 2117 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable(); | |
| 2118 int method_table_offset_in_words = ioe->offset()/wordSize; | |
| 2119 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words()) | |
| 2120 / itableOffsetEntry::size(); | |
| 2121 | |
| 2122 for (int cnt = 0 ; ; cnt ++, ioe ++) { | |
| 605 | 2123 // If the interface isn't implemented by the receiver class, |
| 0 | 2124 // the VM should throw IncompatibleClassChangeError. |
| 2125 if (cnt >= nof_interfaces) { | |
|
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2126 THROW_0(vmSymbols::java_lang_IncompatibleClassChangeError()); |
| 0 | 2127 } |
| 2128 | |
| 2129 klassOop ik = ioe->interface_klass(); | |
| 2130 if (ik == holder) break; | |
| 2131 } | |
| 2132 | |
| 2133 itableMethodEntry* ime = ioe->first_method_entry(as_klassOop()); | |
| 2134 methodOop m = ime[index].method(); | |
| 2135 if (m == NULL) { | |
|
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2136 THROW_0(vmSymbols::java_lang_AbstractMethodError()); |
| 0 | 2137 } |
| 2138 return m; | |
| 2139 } | |
| 2140 | |
| 2141 // On-stack replacement stuff | |
| 2142 void instanceKlass::add_osr_nmethod(nmethod* n) { | |
| 2143 // only one compilation can be active | |
| 2144 NEEDS_CLEANUP | |
| 2145 // This is a short non-blocking critical region, so the no safepoint check is ok. | |
| 2146 OsrList_lock->lock_without_safepoint_check(); | |
| 2147 assert(n->is_osr_method(), "wrong kind of nmethod"); | |
|
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2148 n->set_osr_link(osr_nmethods_head()); |
| 0 | 2149 set_osr_nmethods_head(n); |
| 1783 | 2150 // Raise the highest osr level if necessary |
| 2151 if (TieredCompilation) { | |
| 2152 methodOop m = n->method(); | |
| 2153 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level())); | |
| 2154 } | |
| 0 | 2155 // Remember to unlock again |
| 2156 OsrList_lock->unlock(); | |
| 1783 | 2157 |
| 2158 // Get rid of the osr methods for the same bci that have lower levels. | |
| 2159 if (TieredCompilation) { | |
| 2160 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) { | |
| 2161 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true); | |
| 2162 if (inv != NULL && inv->is_in_use()) { | |
| 2163 inv->make_not_entrant(); | |
| 2164 } | |
| 2165 } | |
| 2166 } | |
| 0 | 2167 } |
| 2168 | |
| 2169 | |
| 2170 void instanceKlass::remove_osr_nmethod(nmethod* n) { | |
| 2171 // This is a short non-blocking critical region, so the no safepoint check is ok. | |
| 2172 OsrList_lock->lock_without_safepoint_check(); | |
| 2173 assert(n->is_osr_method(), "wrong kind of nmethod"); | |
| 2174 nmethod* last = NULL; | |
| 2175 nmethod* cur = osr_nmethods_head(); | |
| 1783 | 2176 int max_level = CompLevel_none; // Find the max comp level excluding n |
| 2177 methodOop m = n->method(); | |
| 0 | 2178 // Search for match |
| 2179 while(cur != NULL && cur != n) { | |
| 1783 | 2180 if (TieredCompilation) { |
| 2181 // Find max level before n | |
| 2182 max_level = MAX2(max_level, cur->comp_level()); | |
| 2183 } | |
| 0 | 2184 last = cur; |
|
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2185 cur = cur->osr_link(); |
| 0 | 2186 } |
| 1783 | 2187 nmethod* next = NULL; |
| 0 | 2188 if (cur == n) { |
| 1783 | 2189 next = cur->osr_link(); |
| 0 | 2190 if (last == NULL) { |
| 2191 // Remove first element | |
| 1783 | 2192 set_osr_nmethods_head(next); |
| 0 | 2193 } else { |
| 1783 | 2194 last->set_osr_link(next); |
| 0 | 2195 } |
| 2196 } | |
|
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2197 n->set_osr_link(NULL); |
| 1783 | 2198 if (TieredCompilation) { |
| 2199 cur = next; | |
| 2200 while (cur != NULL) { | |
| 2201 // Find max level after n | |
| 2202 max_level = MAX2(max_level, cur->comp_level()); | |
| 2203 cur = cur->osr_link(); | |
| 2204 } | |
| 2205 m->set_highest_osr_comp_level(max_level); | |
| 2206 } | |
| 0 | 2207 // Remember to unlock again |
| 2208 OsrList_lock->unlock(); | |
| 2209 } | |
| 2210 | |
| 1783 | 2211 nmethod* instanceKlass::lookup_osr_nmethod(const methodOop m, int bci, int comp_level, bool match_level) const { |
| 0 | 2212 // This is a short non-blocking critical region, so the no safepoint check is ok. |
| 2213 OsrList_lock->lock_without_safepoint_check(); | |
| 2214 nmethod* osr = osr_nmethods_head(); | |
| 1783 | 2215 nmethod* best = NULL; |
| 0 | 2216 while (osr != NULL) { |
| 2217 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain"); | |
| 1783 | 2218 // There can be a time when a c1 osr method exists but we are waiting |
| 2219 // for a c2 version. When c2 completes its osr nmethod we will trash | |
| 2220 // the c1 version and only be able to find the c2 version. However | |
| 2221 // while we overflow in the c1 code at back branches we don't want to | |
| 2222 // try and switch to the same code as we are already running | |
| 2223 | |
| 0 | 2224 if (osr->method() == m && |
| 2225 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) { | |
| 1783 | 2226 if (match_level) { |
| 2227 if (osr->comp_level() == comp_level) { | |
| 2228 // Found a match - return it. | |
| 2229 OsrList_lock->unlock(); | |
| 2230 return osr; | |
| 2231 } | |
| 2232 } else { | |
| 2233 if (best == NULL || (osr->comp_level() > best->comp_level())) { | |
| 2234 if (osr->comp_level() == CompLevel_highest_tier) { | |
| 2235 // Found the best possible - return it. | |
| 2236 OsrList_lock->unlock(); | |
| 2237 return osr; | |
| 2238 } | |
| 2239 best = osr; | |
| 2240 } | |
| 2241 } | |
| 0 | 2242 } |
|
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2243 osr = osr->osr_link(); |
| 0 | 2244 } |
| 2245 OsrList_lock->unlock(); | |
| 1783 | 2246 if (best != NULL && best->comp_level() >= comp_level && match_level == false) { |
| 2247 return best; | |
| 2248 } | |
| 0 | 2249 return NULL; |
| 2250 } | |
| 2251 | |
| 2252 // ----------------------------------------------------------------------------------------------------- | |
| 2253 #ifndef PRODUCT | |
| 2254 | |
| 2255 // Printing | |
| 2256 | |
|
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2257 #define BULLET " - " |
|
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2258 |
| 0 | 2259 void FieldPrinter::do_field(fieldDescriptor* fd) { |
|
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2260 _st->print(BULLET); |
|
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2261 if (_obj == NULL) { |
| 0 | 2262 fd->print_on(_st); |
| 2263 _st->cr(); | |
| 2264 } else { | |
| 2265 fd->print_on_for(_st, _obj); | |
| 2266 _st->cr(); | |
| 2267 } | |
| 2268 } | |
| 2269 | |
| 2270 | |
| 2271 void instanceKlass::oop_print_on(oop obj, outputStream* st) { | |
| 2272 Klass::oop_print_on(obj, st); | |
| 2273 | |
| 1142 | 2274 if (as_klassOop() == SystemDictionary::String_klass()) { |
| 0 | 2275 typeArrayOop value = java_lang_String::value(obj); |
| 2276 juint offset = java_lang_String::offset(obj); | |
| 2277 juint length = java_lang_String::length(obj); | |
| 2278 if (value != NULL && | |
| 2279 value->is_typeArray() && | |
| 2280 offset <= (juint) value->length() && | |
| 2281 offset + length <= (juint) value->length()) { | |
|
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2282 st->print(BULLET"string: "); |
| 0 | 2283 Handle h_obj(obj); |
| 2284 java_lang_String::print(h_obj, st); | |
| 2285 st->cr(); | |
| 2286 if (!WizardMode) return; // that is enough | |
| 2287 } | |
| 2288 } | |
| 2289 | |
|
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2290 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj)); |
|
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2291 FieldPrinter print_field(st, obj); |
|
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2292 do_nonstatic_fields(&print_field); |
| 0 | 2293 |
| 1142 | 2294 if (as_klassOop() == SystemDictionary::Class_klass()) { |
|
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|
2295 st->print(BULLET"signature: "); |
|
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2296 java_lang_Class::print_signature(obj, st); |
|
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2297 st->cr(); |
| 0 | 2298 klassOop mirrored_klass = java_lang_Class::as_klassOop(obj); |
|
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|
2299 st->print(BULLET"fake entry for mirror: "); |
| 0 | 2300 mirrored_klass->print_value_on(st); |
| 2301 st->cr(); | |
|
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|
2302 st->print(BULLET"fake entry resolved_constructor: "); |
| 0 | 2303 methodOop ctor = java_lang_Class::resolved_constructor(obj); |
| 2304 ctor->print_value_on(st); | |
| 2305 klassOop array_klass = java_lang_Class::array_klass(obj); | |
|
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2306 st->cr(); |
|
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2307 st->print(BULLET"fake entry for array: "); |
| 0 | 2308 array_klass->print_value_on(st); |
| 2309 st->cr(); | |
|
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2310 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj)); |
|
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2311 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj)); |
|
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2312 klassOop real_klass = java_lang_Class::as_klassOop(obj); |
|
2408
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2313 if (real_klass != NULL && real_klass->klass_part()->oop_is_instance()) { |
|
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2314 instanceKlass::cast(real_klass)->do_local_static_fields(&print_field); |
|
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|
2315 } |
|
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|
2316 } else if (as_klassOop() == SystemDictionary::MethodType_klass()) { |
|
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|
2317 st->print(BULLET"signature: "); |
|
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|
2318 java_lang_invoke_MethodType::print_signature(obj, st); |
|
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|
2319 st->cr(); |
| 0 | 2320 } |
| 2321 } | |
| 2322 | |
|
1155
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|
2323 #endif //PRODUCT |
|
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|
2324 |
| 0 | 2325 void instanceKlass::oop_print_value_on(oop obj, outputStream* st) { |
| 2326 st->print("a "); | |
| 2327 name()->print_value_on(st); | |
| 2328 obj->print_address_on(st); | |
| 1142 | 2329 if (as_klassOop() == SystemDictionary::String_klass() |
|
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2330 && java_lang_String::value(obj) != NULL) { |
|
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|
2331 ResourceMark rm; |
|
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|
2332 int len = java_lang_String::length(obj); |
|
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|
2333 int plen = (len < 24 ? len : 12); |
|
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|
2334 char* str = java_lang_String::as_utf8_string(obj, 0, plen); |
|
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|
2335 st->print(" = \"%s\"", str); |
|
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|
2336 if (len > plen) |
|
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|
2337 st->print("...[%d]", len); |
| 1142 | 2338 } else if (as_klassOop() == SystemDictionary::Class_klass()) { |
|
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|
2339 klassOop k = java_lang_Class::as_klassOop(obj); |
|
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|
2340 st->print(" = "); |
|
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|
2341 if (k != NULL) { |
|
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|
2342 k->print_value_on(st); |
|
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|
2343 } else { |
|
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|
2344 const char* tname = type2name(java_lang_Class::primitive_type(obj)); |
|
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|
2345 st->print("%s", tname ? tname : "type?"); |
|
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|
2346 } |
|
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|
2347 } else if (as_klassOop() == SystemDictionary::MethodType_klass()) { |
|
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|
2348 st->print(" = "); |
|
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|
2349 java_lang_invoke_MethodType::print_signature(obj, st); |
|
665
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|
2350 } else if (java_lang_boxing_object::is_instance(obj)) { |
|
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|
2351 st->print(" = "); |
|
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|
2352 java_lang_boxing_object::print(obj, st); |
|
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|
2353 } |
| 0 | 2354 } |
| 2355 | |
| 2356 const char* instanceKlass::internal_name() const { | |
| 2357 return external_name(); | |
| 2358 } | |
| 2359 | |
| 2360 // Verification | |
| 2361 | |
| 2362 class VerifyFieldClosure: public OopClosure { | |
|
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2363 protected: |
|
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|
2364 template <class T> void do_oop_work(T* p) { |
| 0 | 2365 guarantee(Universe::heap()->is_in_closed_subset(p), "should be in heap"); |
|
113
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2366 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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2367 if (!obj->is_oop_or_null()) { |
|
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|
2368 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p, (address)obj); |
| 0 | 2369 Universe::print(); |
| 2370 guarantee(false, "boom"); | |
| 2371 } | |
| 2372 } | |
|
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2373 public: |
|
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|
2374 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); } |
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|
2375 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); } |
| 0 | 2376 }; |
| 2377 | |
| 2378 void instanceKlass::oop_verify_on(oop obj, outputStream* st) { | |
| 2379 Klass::oop_verify_on(obj, st); | |
| 2380 VerifyFieldClosure blk; | |
| 2381 oop_oop_iterate(obj, &blk); | |
| 2382 } | |
| 2383 | |
|
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2384 // JNIid class for jfieldIDs only |
|
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|
2385 // Note to reviewers: |
|
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2386 // These JNI functions are just moved over to column 1 and not changed |
|
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|
2387 // in the compressed oops workspace. |
|
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|
2388 JNIid::JNIid(klassOop holder, int offset, JNIid* next) { |
|
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2389 _holder = holder; |
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2390 _offset = offset; |
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2391 _next = next; |
|
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|
2392 debug_only(_is_static_field_id = false;) |
|
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2393 } |
| 0 | 2394 |
| 2395 | |
|
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2396 JNIid* JNIid::find(int offset) { |
|
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|
2397 JNIid* current = this; |
|
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|
2398 while (current != NULL) { |
|
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|
2399 if (current->offset() == offset) return current; |
|
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2400 current = current->next(); |
|
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2401 } |
|
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|
2402 return NULL; |
|
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|
2403 } |
| 0 | 2404 |
| 2405 void JNIid::oops_do(OopClosure* f) { | |
| 2406 for (JNIid* cur = this; cur != NULL; cur = cur->next()) { | |
| 2407 f->do_oop(cur->holder_addr()); | |
| 2408 } | |
| 2409 } | |
| 2410 | |
| 2411 void JNIid::deallocate(JNIid* current) { | |
|
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2412 while (current != NULL) { |
|
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2413 JNIid* next = current->next(); |
|
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2414 delete current; |
|
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|
2415 current = next; |
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|
2416 } |
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|
2417 } |
| 0 | 2418 |
| 2419 | |
|
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|
2420 void JNIid::verify(klassOop holder) { |
|
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|
2421 int first_field_offset = instanceMirrorKlass::offset_of_static_fields(); |
|
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2422 int end_field_offset; |
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|
2423 end_field_offset = first_field_offset + (instanceKlass::cast(holder)->static_field_size() * wordSize); |
| 0 | 2424 |
|
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|
2425 JNIid* current = this; |
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|
2426 while (current != NULL) { |
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|
2427 guarantee(current->holder() == holder, "Invalid klass in JNIid"); |
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|
2428 #ifdef ASSERT |
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|
2429 int o = current->offset(); |
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|
2430 if (current->is_static_field_id()) { |
|
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|
2431 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid"); |
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|
2432 } |
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|
2433 #endif |
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|
2434 current = current->next(); |
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|
2435 } |
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|
2436 } |
| 0 | 2437 |
| 2438 | |
| 2439 #ifdef ASSERT | |
|
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|
2440 void instanceKlass::set_init_state(ClassState state) { |
|
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|
2441 bool good_state = as_klassOop()->is_shared() ? (_init_state <= state) |
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|
2442 : (_init_state < state); |
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|
2443 assert(good_state || state == allocated, "illegal state transition"); |
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|
2444 _init_state = state; |
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|
2445 } |
| 0 | 2446 #endif |
| 2447 | |
| 2448 | |
| 2449 // RedefineClasses() support for previous versions: | |
| 2450 | |
| 2451 // Add an information node that contains weak references to the | |
| 2452 // interesting parts of the previous version of the_class. | |
|
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|
2453 // This is also where we clean out any unused weak references. |
|
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|
2454 // Note that while we delete nodes from the _previous_versions |
|
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|
2455 // array, we never delete the array itself until the klass is |
|
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|
2456 // unloaded. The has_been_redefined() query depends on that fact. |
|
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|
2457 // |
| 0 | 2458 void instanceKlass::add_previous_version(instanceKlassHandle ikh, |
|
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|
2459 BitMap* emcp_methods, int emcp_method_count) { |
| 0 | 2460 assert(Thread::current()->is_VM_thread(), |
|
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|
2461 "only VMThread can add previous versions"); |
| 0 | 2462 |
| 2463 if (_previous_versions == NULL) { | |
| 2464 // This is the first previous version so make some space. | |
| 2465 // Start with 2 elements under the assumption that the class | |
| 2466 // won't be redefined much. | |
| 2467 _previous_versions = new (ResourceObj::C_HEAP) | |
| 2468 GrowableArray<PreviousVersionNode *>(2, true); | |
| 2469 } | |
| 2470 | |
| 2471 // RC_TRACE macro has an embedded ResourceMark | |
| 2472 RC_TRACE(0x00000100, ("adding previous version ref for %s @%d, EMCP_cnt=%d", | |
| 2473 ikh->external_name(), _previous_versions->length(), emcp_method_count)); | |
| 2474 constantPoolHandle cp_h(ikh->constants()); | |
|
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|
2475 jobject cp_ref; |
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|
2476 if (cp_h->is_shared()) { |
|
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2477 // a shared ConstantPool requires a regular reference; a weak |
|
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|
2478 // reference would be collectible |
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|
2479 cp_ref = JNIHandles::make_global(cp_h); |
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|
2480 } else { |
|
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|
2481 cp_ref = JNIHandles::make_weak_global(cp_h); |
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|
2482 } |
| 0 | 2483 PreviousVersionNode * pv_node = NULL; |
| 2484 objArrayOop old_methods = ikh->methods(); | |
| 2485 | |
| 2486 if (emcp_method_count == 0) { | |
|
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|
2487 // non-shared ConstantPool gets a weak reference |
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|
2488 pv_node = new PreviousVersionNode(cp_ref, !cp_h->is_shared(), NULL); |
| 0 | 2489 RC_TRACE(0x00000400, |
| 2490 ("add: all methods are obsolete; flushing any EMCP weak refs")); | |
| 2491 } else { | |
| 2492 int local_count = 0; | |
| 2493 GrowableArray<jweak>* method_refs = new (ResourceObj::C_HEAP) | |
| 2494 GrowableArray<jweak>(emcp_method_count, true); | |
| 2495 for (int i = 0; i < old_methods->length(); i++) { | |
| 2496 if (emcp_methods->at(i)) { | |
| 2497 // this old method is EMCP so save a weak ref | |
| 2498 methodOop old_method = (methodOop) old_methods->obj_at(i); | |
| 2499 methodHandle old_method_h(old_method); | |
| 2500 jweak method_ref = JNIHandles::make_weak_global(old_method_h); | |
| 2501 method_refs->append(method_ref); | |
| 2502 if (++local_count >= emcp_method_count) { | |
| 2503 // no more EMCP methods so bail out now | |
| 2504 break; | |
| 2505 } | |
| 2506 } | |
| 2507 } | |
|
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|
2508 // non-shared ConstantPool gets a weak reference |
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|
2509 pv_node = new PreviousVersionNode(cp_ref, !cp_h->is_shared(), method_refs); |
| 0 | 2510 } |
| 2511 | |
| 2512 _previous_versions->append(pv_node); | |
| 2513 | |
| 2514 // Using weak references allows the interesting parts of previous | |
| 2515 // classes to be GC'ed when they are no longer needed. Since the | |
| 2516 // caller is the VMThread and we are at a safepoint, this is a good | |
| 2517 // time to clear out unused weak references. | |
| 2518 | |
| 2519 RC_TRACE(0x00000400, ("add: previous version length=%d", | |
| 2520 _previous_versions->length())); | |
| 2521 | |
| 2522 // skip the last entry since we just added it | |
| 2523 for (int i = _previous_versions->length() - 2; i >= 0; i--) { | |
| 2524 // check the previous versions array for a GC'ed weak refs | |
| 2525 pv_node = _previous_versions->at(i); | |
| 2526 cp_ref = pv_node->prev_constant_pool(); | |
|
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|
2527 assert(cp_ref != NULL, "cp ref was unexpectedly cleared"); |
| 0 | 2528 if (cp_ref == NULL) { |
| 2529 delete pv_node; | |
| 2530 _previous_versions->remove_at(i); | |
| 2531 // Since we are traversing the array backwards, we don't have to | |
| 2532 // do anything special with the index. | |
| 2533 continue; // robustness | |
| 2534 } | |
| 2535 | |
| 2536 constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); | |
| 2537 if (cp == NULL) { | |
| 2538 // this entry has been GC'ed so remove it | |
| 2539 delete pv_node; | |
| 2540 _previous_versions->remove_at(i); | |
| 2541 // Since we are traversing the array backwards, we don't have to | |
| 2542 // do anything special with the index. | |
| 2543 continue; | |
| 2544 } else { | |
| 2545 RC_TRACE(0x00000400, ("add: previous version @%d is alive", i)); | |
| 2546 } | |
| 2547 | |
| 2548 GrowableArray<jweak>* method_refs = pv_node->prev_EMCP_methods(); | |
| 2549 if (method_refs != NULL) { | |
| 2550 RC_TRACE(0x00000400, ("add: previous methods length=%d", | |
| 2551 method_refs->length())); | |
| 2552 for (int j = method_refs->length() - 1; j >= 0; j--) { | |
| 2553 jweak method_ref = method_refs->at(j); | |
| 2554 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); | |
| 2555 if (method_ref == NULL) { | |
| 2556 method_refs->remove_at(j); | |
| 2557 // Since we are traversing the array backwards, we don't have to | |
| 2558 // do anything special with the index. | |
| 2559 continue; // robustness | |
| 2560 } | |
| 2561 | |
| 2562 methodOop method = (methodOop)JNIHandles::resolve(method_ref); | |
| 2563 if (method == NULL || emcp_method_count == 0) { | |
| 2564 // This method entry has been GC'ed or the current | |
| 2565 // RedefineClasses() call has made all methods obsolete | |
| 2566 // so remove it. | |
| 2567 JNIHandles::destroy_weak_global(method_ref); | |
| 2568 method_refs->remove_at(j); | |
| 2569 } else { | |
| 2570 // RC_TRACE macro has an embedded ResourceMark | |
| 2571 RC_TRACE(0x00000400, | |
| 2572 ("add: %s(%s): previous method @%d in version @%d is alive", | |
| 2573 method->name()->as_C_string(), method->signature()->as_C_string(), | |
| 2574 j, i)); | |
| 2575 } | |
| 2576 } | |
| 2577 } | |
| 2578 } | |
| 2579 | |
| 2580 int obsolete_method_count = old_methods->length() - emcp_method_count; | |
| 2581 | |
| 2582 if (emcp_method_count != 0 && obsolete_method_count != 0 && | |
| 2583 _previous_versions->length() > 1) { | |
| 2584 // We have a mix of obsolete and EMCP methods. If there is more | |
| 2585 // than the previous version that we just added, then we have to | |
| 2586 // clear out any matching EMCP method entries the hard way. | |
| 2587 int local_count = 0; | |
| 2588 for (int i = 0; i < old_methods->length(); i++) { | |
| 2589 if (!emcp_methods->at(i)) { | |
| 2590 // only obsolete methods are interesting | |
| 2591 methodOop old_method = (methodOop) old_methods->obj_at(i); | |
|
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|
2592 Symbol* m_name = old_method->name(); |
|
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|
2593 Symbol* m_signature = old_method->signature(); |
| 0 | 2594 |
| 2595 // skip the last entry since we just added it | |
| 2596 for (int j = _previous_versions->length() - 2; j >= 0; j--) { | |
| 2597 // check the previous versions array for a GC'ed weak refs | |
| 2598 pv_node = _previous_versions->at(j); | |
| 2599 cp_ref = pv_node->prev_constant_pool(); | |
|
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|
2600 assert(cp_ref != NULL, "cp ref was unexpectedly cleared"); |
| 0 | 2601 if (cp_ref == NULL) { |
| 2602 delete pv_node; | |
| 2603 _previous_versions->remove_at(j); | |
| 2604 // Since we are traversing the array backwards, we don't have to | |
| 2605 // do anything special with the index. | |
| 2606 continue; // robustness | |
| 2607 } | |
| 2608 | |
| 2609 constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); | |
| 2610 if (cp == NULL) { | |
| 2611 // this entry has been GC'ed so remove it | |
| 2612 delete pv_node; | |
| 2613 _previous_versions->remove_at(j); | |
| 2614 // Since we are traversing the array backwards, we don't have to | |
| 2615 // do anything special with the index. | |
| 2616 continue; | |
| 2617 } | |
| 2618 | |
| 2619 GrowableArray<jweak>* method_refs = pv_node->prev_EMCP_methods(); | |
| 2620 if (method_refs == NULL) { | |
| 2621 // We have run into a PreviousVersion generation where | |
| 2622 // all methods were made obsolete during that generation's | |
| 2623 // RedefineClasses() operation. At the time of that | |
| 2624 // operation, all EMCP methods were flushed so we don't | |
| 2625 // have to go back any further. | |
| 2626 // | |
| 2627 // A NULL method_refs is different than an empty method_refs. | |
| 2628 // We cannot infer any optimizations about older generations | |
| 2629 // from an empty method_refs for the current generation. | |
| 2630 break; | |
| 2631 } | |
| 2632 | |
| 2633 for (int k = method_refs->length() - 1; k >= 0; k--) { | |
| 2634 jweak method_ref = method_refs->at(k); | |
| 2635 assert(method_ref != NULL, | |
| 2636 "weak method ref was unexpectedly cleared"); | |
| 2637 if (method_ref == NULL) { | |
| 2638 method_refs->remove_at(k); | |
| 2639 // Since we are traversing the array backwards, we don't | |
| 2640 // have to do anything special with the index. | |
| 2641 continue; // robustness | |
| 2642 } | |
| 2643 | |
| 2644 methodOop method = (methodOop)JNIHandles::resolve(method_ref); | |
| 2645 if (method == NULL) { | |
| 2646 // this method entry has been GC'ed so skip it | |
| 2647 JNIHandles::destroy_weak_global(method_ref); | |
| 2648 method_refs->remove_at(k); | |
| 2649 continue; | |
| 2650 } | |
| 2651 | |
| 2652 if (method->name() == m_name && | |
| 2653 method->signature() == m_signature) { | |
| 2654 // The current RedefineClasses() call has made all EMCP | |
| 2655 // versions of this method obsolete so mark it as obsolete | |
| 2656 // and remove the weak ref. | |
| 2657 RC_TRACE(0x00000400, | |
| 2658 ("add: %s(%s): flush obsolete method @%d in version @%d", | |
| 2659 m_name->as_C_string(), m_signature->as_C_string(), k, j)); | |
| 2660 | |
| 2661 method->set_is_obsolete(); | |
| 2662 JNIHandles::destroy_weak_global(method_ref); | |
| 2663 method_refs->remove_at(k); | |
| 2664 break; | |
| 2665 } | |
| 2666 } | |
| 2667 | |
| 2668 // The previous loop may not find a matching EMCP method, but | |
| 2669 // that doesn't mean that we can optimize and not go any | |
| 2670 // further back in the PreviousVersion generations. The EMCP | |
| 2671 // method for this generation could have already been GC'ed, | |
| 2672 // but there still may be an older EMCP method that has not | |
| 2673 // been GC'ed. | |
| 2674 } | |
| 2675 | |
| 2676 if (++local_count >= obsolete_method_count) { | |
| 2677 // no more obsolete methods so bail out now | |
| 2678 break; | |
| 2679 } | |
| 2680 } | |
| 2681 } | |
| 2682 } | |
| 2683 } // end add_previous_version() | |
| 2684 | |
| 2685 | |
| 2686 // Determine if instanceKlass has a previous version. | |
| 2687 bool instanceKlass::has_previous_version() const { | |
| 2688 if (_previous_versions == NULL) { | |
| 2689 // no previous versions array so answer is easy | |
| 2690 return false; | |
| 2691 } | |
| 2692 | |
| 2693 for (int i = _previous_versions->length() - 1; i >= 0; i--) { | |
| 2694 // Check the previous versions array for an info node that hasn't | |
| 2695 // been GC'ed | |
| 2696 PreviousVersionNode * pv_node = _previous_versions->at(i); | |
| 2697 | |
|
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|
2698 jobject cp_ref = pv_node->prev_constant_pool(); |
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|
2699 assert(cp_ref != NULL, "cp reference was unexpectedly cleared"); |
| 0 | 2700 if (cp_ref == NULL) { |
| 2701 continue; // robustness | |
| 2702 } | |
| 2703 | |
| 2704 constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); | |
| 2705 if (cp != NULL) { | |
| 2706 // we have at least one previous version | |
| 2707 return true; | |
| 2708 } | |
| 2709 | |
| 2710 // We don't have to check the method refs. If the constant pool has | |
| 2711 // been GC'ed then so have the methods. | |
| 2712 } | |
| 2713 | |
| 2714 // all of the underlying nodes' info has been GC'ed | |
| 2715 return false; | |
| 2716 } // end has_previous_version() | |
| 2717 | |
| 2718 methodOop instanceKlass::method_with_idnum(int idnum) { | |
| 2719 methodOop m = NULL; | |
| 2720 if (idnum < methods()->length()) { | |
| 2721 m = (methodOop) methods()->obj_at(idnum); | |
| 2722 } | |
| 2723 if (m == NULL || m->method_idnum() != idnum) { | |
| 2724 for (int index = 0; index < methods()->length(); ++index) { | |
| 2725 m = (methodOop) methods()->obj_at(index); | |
| 2726 if (m->method_idnum() == idnum) { | |
| 2727 return m; | |
| 2728 } | |
| 2729 } | |
| 2730 } | |
| 2731 return m; | |
| 2732 } | |
| 2733 | |
| 2734 | |
| 2735 // Set the annotation at 'idnum' to 'anno'. | |
| 2736 // We don't want to create or extend the array if 'anno' is NULL, since that is the | |
| 2737 // default value. However, if the array exists and is long enough, we must set NULL values. | |
| 2738 void instanceKlass::set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p) { | |
| 2739 objArrayOop md = *md_p; | |
| 2740 if (md != NULL && md->length() > idnum) { | |
| 2741 md->obj_at_put(idnum, anno); | |
| 2742 } else if (anno != NULL) { | |
| 2743 // create the array | |
| 2744 int length = MAX2(idnum+1, (int)_idnum_allocated_count); | |
| 2745 md = oopFactory::new_system_objArray(length, Thread::current()); | |
| 2746 if (*md_p != NULL) { | |
| 2747 // copy the existing entries | |
| 2748 for (int index = 0; index < (*md_p)->length(); index++) { | |
| 2749 md->obj_at_put(index, (*md_p)->obj_at(index)); | |
| 2750 } | |
| 2751 } | |
| 2752 set_annotations(md, md_p); | |
| 2753 md->obj_at_put(idnum, anno); | |
| 2754 } // if no array and idnum isn't included there is nothing to do | |
| 2755 } | |
| 2756 | |
| 2757 // Construct a PreviousVersionNode entry for the array hung off | |
| 2758 // the instanceKlass. | |
|
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2759 PreviousVersionNode::PreviousVersionNode(jobject prev_constant_pool, |
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2760 bool prev_cp_is_weak, GrowableArray<jweak>* prev_EMCP_methods) { |
| 0 | 2761 |
| 2762 _prev_constant_pool = prev_constant_pool; | |
|
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2763 _prev_cp_is_weak = prev_cp_is_weak; |
| 0 | 2764 _prev_EMCP_methods = prev_EMCP_methods; |
| 2765 } | |
| 2766 | |
| 2767 | |
| 2768 // Destroy a PreviousVersionNode | |
| 2769 PreviousVersionNode::~PreviousVersionNode() { | |
| 2770 if (_prev_constant_pool != NULL) { | |
|
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2771 if (_prev_cp_is_weak) { |
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2772 JNIHandles::destroy_weak_global(_prev_constant_pool); |
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2773 } else { |
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2774 JNIHandles::destroy_global(_prev_constant_pool); |
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2775 } |
| 0 | 2776 } |
| 2777 | |
| 2778 if (_prev_EMCP_methods != NULL) { | |
| 2779 for (int i = _prev_EMCP_methods->length() - 1; i >= 0; i--) { | |
| 2780 jweak method_ref = _prev_EMCP_methods->at(i); | |
| 2781 if (method_ref != NULL) { | |
| 2782 JNIHandles::destroy_weak_global(method_ref); | |
| 2783 } | |
| 2784 } | |
| 2785 delete _prev_EMCP_methods; | |
| 2786 } | |
| 2787 } | |
| 2788 | |
| 2789 | |
| 2790 // Construct a PreviousVersionInfo entry | |
| 2791 PreviousVersionInfo::PreviousVersionInfo(PreviousVersionNode *pv_node) { | |
| 2792 _prev_constant_pool_handle = constantPoolHandle(); // NULL handle | |
| 2793 _prev_EMCP_method_handles = NULL; | |
| 2794 | |
|
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2795 jobject cp_ref = pv_node->prev_constant_pool(); |
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2796 assert(cp_ref != NULL, "constant pool ref was unexpectedly cleared"); |
| 0 | 2797 if (cp_ref == NULL) { |
| 2798 return; // robustness | |
| 2799 } | |
| 2800 | |
| 2801 constantPoolOop cp = (constantPoolOop)JNIHandles::resolve(cp_ref); | |
| 2802 if (cp == NULL) { | |
| 2803 // Weak reference has been GC'ed. Since the constant pool has been | |
| 2804 // GC'ed, the methods have also been GC'ed. | |
| 2805 return; | |
| 2806 } | |
| 2807 | |
| 2808 // make the constantPoolOop safe to return | |
| 2809 _prev_constant_pool_handle = constantPoolHandle(cp); | |
| 2810 | |
| 2811 GrowableArray<jweak>* method_refs = pv_node->prev_EMCP_methods(); | |
| 2812 if (method_refs == NULL) { | |
| 2813 // the instanceKlass did not have any EMCP methods | |
| 2814 return; | |
| 2815 } | |
| 2816 | |
| 2817 _prev_EMCP_method_handles = new GrowableArray<methodHandle>(10); | |
| 2818 | |
| 2819 int n_methods = method_refs->length(); | |
| 2820 for (int i = 0; i < n_methods; i++) { | |
| 2821 jweak method_ref = method_refs->at(i); | |
| 2822 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); | |
| 2823 if (method_ref == NULL) { | |
| 2824 continue; // robustness | |
| 2825 } | |
| 2826 | |
| 2827 methodOop method = (methodOop)JNIHandles::resolve(method_ref); | |
| 2828 if (method == NULL) { | |
| 2829 // this entry has been GC'ed so skip it | |
| 2830 continue; | |
| 2831 } | |
| 2832 | |
| 2833 // make the methodOop safe to return | |
| 2834 _prev_EMCP_method_handles->append(methodHandle(method)); | |
| 2835 } | |
| 2836 } | |
| 2837 | |
| 2838 | |
| 2839 // Destroy a PreviousVersionInfo | |
| 2840 PreviousVersionInfo::~PreviousVersionInfo() { | |
| 2841 // Since _prev_EMCP_method_handles is not C-heap allocated, we | |
| 2842 // don't have to delete it. | |
| 2843 } | |
| 2844 | |
| 2845 | |
| 2846 // Construct a helper for walking the previous versions array | |
| 2847 PreviousVersionWalker::PreviousVersionWalker(instanceKlass *ik) { | |
| 2848 _previous_versions = ik->previous_versions(); | |
| 2849 _current_index = 0; | |
| 2850 // _hm needs no initialization | |
| 2851 _current_p = NULL; | |
| 2852 } | |
| 2853 | |
| 2854 | |
| 2855 // Destroy a PreviousVersionWalker | |
| 2856 PreviousVersionWalker::~PreviousVersionWalker() { | |
| 2857 // Delete the current info just in case the caller didn't walk to | |
| 2858 // the end of the previous versions list. No harm if _current_p is | |
| 2859 // already NULL. | |
| 2860 delete _current_p; | |
| 2861 | |
| 2862 // When _hm is destroyed, all the Handles returned in | |
| 2863 // PreviousVersionInfo objects will be destroyed. | |
| 2864 // Also, after this destructor is finished it will be | |
| 2865 // safe to delete the GrowableArray allocated in the | |
| 2866 // PreviousVersionInfo objects. | |
| 2867 } | |
| 2868 | |
| 2869 | |
| 2870 // Return the interesting information for the next previous version | |
| 2871 // of the klass. Returns NULL if there are no more previous versions. | |
| 2872 PreviousVersionInfo* PreviousVersionWalker::next_previous_version() { | |
| 2873 if (_previous_versions == NULL) { | |
| 2874 // no previous versions so nothing to return | |
| 2875 return NULL; | |
| 2876 } | |
| 2877 | |
| 2878 delete _current_p; // cleanup the previous info for the caller | |
| 2879 _current_p = NULL; // reset to NULL so we don't delete same object twice | |
| 2880 | |
| 2881 int length = _previous_versions->length(); | |
| 2882 | |
| 2883 while (_current_index < length) { | |
| 2884 PreviousVersionNode * pv_node = _previous_versions->at(_current_index++); | |
| 2885 PreviousVersionInfo * pv_info = new (ResourceObj::C_HEAP) | |
| 2886 PreviousVersionInfo(pv_node); | |
| 2887 | |
| 2888 constantPoolHandle cp_h = pv_info->prev_constant_pool_handle(); | |
| 2889 if (cp_h.is_null()) { | |
| 2890 delete pv_info; | |
| 2891 | |
| 2892 // The underlying node's info has been GC'ed so try the next one. | |
| 2893 // We don't have to check the methods. If the constant pool has | |
| 2894 // GC'ed then so have the methods. | |
| 2895 continue; | |
| 2896 } | |
| 2897 | |
| 2898 // Found a node with non GC'ed info so return it. The caller will | |
| 2899 // need to delete pv_info when they are done with it. | |
| 2900 _current_p = pv_info; | |
| 2901 return pv_info; | |
| 2902 } | |
| 2903 | |
| 2904 // all of the underlying nodes' info has been GC'ed | |
| 2905 return NULL; | |
| 2906 } // end next_previous_version() |