1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoaderData.hpp" 27 #include "classfile/javaClasses.inline.hpp" 28 #include "classfile/metadataOnStackMark.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "interpreter/linkResolver.hpp" 33 #include "memory/heapInspection.hpp" 34 #include "memory/metadataFactory.hpp" 35 #include "memory/oopFactory.hpp" 36 #include "oops/constantPool.hpp" 37 #include "oops/instanceKlass.hpp" 38 #include "oops/objArrayKlass.hpp" 39 #include "oops/objArrayOop.inline.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "runtime/fieldType.hpp" 42 #include "runtime/init.hpp" 43 #include "runtime/javaCalls.hpp" 44 #include "runtime/signature.hpp" 45 #include "runtime/vframe.hpp" 46 #include "utilities/copy.hpp" 47 48 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 49 50 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { 51 // Tags are RW but comment below applies to tags also. 52 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); 53 54 int size = ConstantPool::size(length); 55 56 // CDS considerations: 57 // Allocate read-write but may be able to move to read-only at dumping time 58 // if all the klasses are resolved. The only other field that is writable is 59 // the resolved_references array, which is recreated at startup time. 60 // But that could be moved to InstanceKlass (although a pain to access from 61 // assembly code). Maybe it could be moved to the cpCache which is RW. 62 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); 63 } 64 65 ConstantPool::ConstantPool(Array<u1>* tags) { 66 set_length(tags->length()); 67 set_tags(NULL); 68 set_cache(NULL); 69 set_reference_map(NULL); 70 set_resolved_references(NULL); 71 set_operands(NULL); 72 set_pool_holder(NULL); 73 set_flags(0); 74 75 // only set to non-zero if constant pool is merged by RedefineClasses 76 set_version(0); 77 78 // initialize tag array 79 int length = tags->length(); 80 for (int index = 0; index < length; index++) { 81 tags->at_put(index, JVM_CONSTANT_Invalid); 82 } 83 set_tags(tags); 84 } 85 86 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { 87 MetadataFactory::free_metadata(loader_data, cache()); 88 set_cache(NULL); 89 MetadataFactory::free_array<u2>(loader_data, reference_map()); 90 set_reference_map(NULL); 91 92 MetadataFactory::free_array<jushort>(loader_data, operands()); 93 set_operands(NULL); 94 95 release_C_heap_structures(); 96 97 // free tag array 98 MetadataFactory::free_array<u1>(loader_data, tags()); 99 set_tags(NULL); 100 } 101 102 void ConstantPool::release_C_heap_structures() { 103 // walk constant pool and decrement symbol reference counts 104 unreference_symbols(); 105 } 106 107 objArrayOop ConstantPool::resolved_references() const { 108 return (objArrayOop)JNIHandles::resolve(_resolved_references); 109 } 110 111 // Create resolved_references array and mapping array for original cp indexes 112 // The ldc bytecode was rewritten to have the resolved reference array index so need a way 113 // to map it back for resolving and some unlikely miscellaneous uses. 114 // The objects created by invokedynamic are appended to this list. 115 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, 116 intStack reference_map, 117 int constant_pool_map_length, 118 TRAPS) { 119 // Initialized the resolved object cache. 120 int map_length = reference_map.length(); 121 if (map_length > 0) { 122 // Only need mapping back to constant pool entries. The map isn't used for 123 // invokedynamic resolved_reference entries. For invokedynamic entries, 124 // the constant pool cache index has the mapping back to both the constant 125 // pool and to the resolved reference index. 126 if (constant_pool_map_length > 0) { 127 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK); 128 129 for (int i = 0; i < constant_pool_map_length; i++) { 130 int x = reference_map.at(i); 131 assert(x == (int)(jushort) x, "klass index is too big"); 132 om->at_put(i, (jushort)x); 133 } 134 set_reference_map(om); 135 } 136 137 // Create Java array for holding resolved strings, methodHandles, 138 // methodTypes, invokedynamic and invokehandle appendix objects, etc. 139 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 140 Handle refs_handle (THREAD, (oop)stom); // must handleize. 141 set_resolved_references(loader_data->add_handle(refs_handle)); 142 } 143 } 144 145 // CDS support. Create a new resolved_references array. 146 void ConstantPool::restore_unshareable_info(TRAPS) { 147 148 // Only create the new resolved references array if it hasn't been attempted before 149 if (resolved_references() != NULL) return; 150 151 // restore the C++ vtable from the shared archive 152 restore_vtable(); 153 154 if (SystemDictionary::Object_klass_loaded()) { 155 // Recreate the object array and add to ClassLoaderData. 156 int map_length = resolved_reference_length(); 157 if (map_length > 0) { 158 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 159 Handle refs_handle (THREAD, (oop)stom); // must handleize. 160 161 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 162 set_resolved_references(loader_data->add_handle(refs_handle)); 163 } 164 } 165 } 166 167 void ConstantPool::remove_unshareable_info() { 168 // Resolved references are not in the shared archive. 169 // Save the length for restoration. It is not necessarily the same length 170 // as reference_map.length() if invokedynamic is saved. 171 set_resolved_reference_length( 172 resolved_references() != NULL ? resolved_references()->length() : 0); 173 set_resolved_references(NULL); 174 } 175 176 int ConstantPool::cp_to_object_index(int cp_index) { 177 // this is harder don't do this so much. 178 int i = reference_map()->find(cp_index); 179 // We might not find the index for jsr292 call. 180 return (i < 0) ? _no_index_sentinel : i; 181 } 182 183 void ConstantPool::trace_class_resolution(constantPoolHandle this_cp, KlassHandle k) { 184 ResourceMark rm; 185 int line_number = -1; 186 const char * source_file = NULL; 187 if (JavaThread::current()->has_last_Java_frame()) { 188 // try to identify the method which called this function. 189 vframeStream vfst(JavaThread::current()); 190 if (!vfst.at_end()) { 191 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 192 Symbol* s = vfst.method()->method_holder()->source_file_name(); 193 if (s != NULL) { 194 source_file = s->as_C_string(); 195 } 196 } 197 } 198 if (k() != this_cp->pool_holder()) { 199 // only print something if the classes are different 200 if (source_file != NULL) { 201 tty->print("RESOLVE %s %s %s:%d\n", 202 this_cp->pool_holder()->external_name(), 203 InstanceKlass::cast(k())->external_name(), source_file, line_number); 204 } else { 205 tty->print("RESOLVE %s %s\n", 206 this_cp->pool_holder()->external_name(), 207 InstanceKlass::cast(k())->external_name()); 208 } 209 } 210 } 211 212 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_cp, int which, 213 bool save_resolution_error, TRAPS) { 214 assert(THREAD->is_Java_thread(), "must be a Java thread"); 215 216 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 217 // It is not safe to rely on the tag bit's here, since we don't have a lock, and 218 // the entry and tag is not updated atomicly. 219 CPSlot entry = this_cp->slot_at(which); 220 if (entry.is_resolved()) { 221 assert(entry.get_klass()->is_klass(), "must be"); 222 // Already resolved - return entry. 223 return entry.get_klass(); 224 } 225 226 // This tag doesn't change back to unresolved class unless at a safepoint. 227 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) { 228 // The original attempt to resolve this constant pool entry failed so find the 229 // class of the original error and throw another error of the same class 230 // (JVMS 5.4.3). 231 // If there is a detail message, pass that detail message to the error. 232 // The JVMS does not strictly require us to duplicate the same detail message, 233 // or any internal exception fields such as cause or stacktrace. But since the 234 // detail message is often a class name or other literal string, we will repeat it 235 // if we can find it in the symbol table. 236 throw_resolution_error(this_cp, which, CHECK_0); 237 ShouldNotReachHere(); 238 } 239 240 Handle mirror_handle; 241 Symbol* name = entry.get_symbol(); 242 Handle loader (THREAD, this_cp->pool_holder()->class_loader()); 243 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain()); 244 Klass* kk = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD); 245 KlassHandle k (THREAD, kk); 246 if (!HAS_PENDING_EXCEPTION) { 247 // preserve the resolved klass from unloading 248 mirror_handle = Handle(THREAD, kk->java_mirror()); 249 // Do access check for klasses 250 verify_constant_pool_resolve(this_cp, k, THREAD); 251 } 252 253 // Failed to resolve class. We must record the errors so that subsequent attempts 254 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). 255 if (HAS_PENDING_EXCEPTION) { 256 if (save_resolution_error) { 257 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL); 258 // If CHECK_NULL above doesn't return the exception, that means that 259 // some other thread has beaten us and has resolved the class. 260 // To preserve old behavior, we return the resolved class. 261 entry = this_cp->resolved_klass_at(which); 262 assert(entry.is_resolved(), "must be resolved if exception was cleared"); 263 assert(entry.get_klass()->is_klass(), "must be resolved to a klass"); 264 return entry.get_klass(); 265 } else { 266 return NULL; // return the pending exception 267 } 268 } 269 270 // Make this class loader depend upon the class loader owning the class reference 271 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data(); 272 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM 273 274 if (TraceClassResolution && !k->oop_is_array()) { 275 // skip resolving the constant pool so that this code gets 276 // called the next time some bytecodes refer to this class. 277 trace_class_resolution(this_cp, k); 278 return k(); 279 } else { 280 this_cp->klass_at_put(which, k()); 281 } 282 283 entry = this_cp->resolved_klass_at(which); 284 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); 285 return entry.get_klass(); 286 } 287 288 289 // Does not update ConstantPool* - to avoid any exception throwing. Used 290 // by compiler and exception handling. Also used to avoid classloads for 291 // instanceof operations. Returns NULL if the class has not been loaded or 292 // if the verification of constant pool failed 293 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_cp, int which) { 294 CPSlot entry = this_cp->slot_at(which); 295 if (entry.is_resolved()) { 296 assert(entry.get_klass()->is_klass(), "must be"); 297 return entry.get_klass(); 298 } else { 299 assert(entry.is_unresolved(), "must be either symbol or klass"); 300 Thread *thread = Thread::current(); 301 Symbol* name = entry.get_symbol(); 302 oop loader = this_cp->pool_holder()->class_loader(); 303 oop protection_domain = this_cp->pool_holder()->protection_domain(); 304 Handle h_prot (thread, protection_domain); 305 Handle h_loader (thread, loader); 306 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); 307 308 if (k != NULL) { 309 // Make sure that resolving is legal 310 EXCEPTION_MARK; 311 KlassHandle klass(THREAD, k); 312 // return NULL if verification fails 313 verify_constant_pool_resolve(this_cp, klass, THREAD); 314 if (HAS_PENDING_EXCEPTION) { 315 CLEAR_PENDING_EXCEPTION; 316 return NULL; 317 } 318 return klass(); 319 } else { 320 return k; 321 } 322 } 323 } 324 325 326 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_cp, int which) { 327 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which)); 328 } 329 330 331 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool, 332 int which) { 333 if (cpool->cache() == NULL) return NULL; // nothing to load yet 334 int cache_index = decode_cpcache_index(which, true); 335 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { 336 // FIXME: should be an assert 337 if (PrintMiscellaneous && (Verbose||WizardMode)) { 338 tty->print_cr("bad operand %d in:", which); cpool->print(); 339 } 340 return NULL; 341 } 342 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 343 return e->method_if_resolved(cpool); 344 } 345 346 347 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) { 348 if (cpool->cache() == NULL) return false; // nothing to load yet 349 int cache_index = decode_cpcache_index(which, true); 350 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 351 return e->has_appendix(); 352 } 353 354 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) { 355 if (cpool->cache() == NULL) return NULL; // nothing to load yet 356 int cache_index = decode_cpcache_index(which, true); 357 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 358 return e->appendix_if_resolved(cpool); 359 } 360 361 362 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) { 363 if (cpool->cache() == NULL) return false; // nothing to load yet 364 int cache_index = decode_cpcache_index(which, true); 365 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 366 return e->has_method_type(); 367 } 368 369 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) { 370 if (cpool->cache() == NULL) return NULL; // nothing to load yet 371 int cache_index = decode_cpcache_index(which, true); 372 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 373 return e->method_type_if_resolved(cpool); 374 } 375 376 377 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { 378 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 379 return symbol_at(name_index); 380 } 381 382 383 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { 384 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 385 return symbol_at(signature_index); 386 } 387 388 389 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { 390 int i = which; 391 if (!uncached && cache() != NULL) { 392 if (ConstantPool::is_invokedynamic_index(which)) { 393 // Invokedynamic index is index into resolved_references 394 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); 395 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); 396 assert(tag_at(pool_index).is_name_and_type(), ""); 397 return pool_index; 398 } 399 // change byte-ordering and go via cache 400 i = remap_instruction_operand_from_cache(which); 401 } else { 402 if (tag_at(which).is_invoke_dynamic()) { 403 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); 404 assert(tag_at(pool_index).is_name_and_type(), ""); 405 return pool_index; 406 } 407 } 408 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 409 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); 410 jint ref_index = *int_at_addr(i); 411 return extract_high_short_from_int(ref_index); 412 } 413 414 415 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { 416 guarantee(!ConstantPool::is_invokedynamic_index(which), 417 "an invokedynamic instruction does not have a klass"); 418 int i = which; 419 if (!uncached && cache() != NULL) { 420 // change byte-ordering and go via cache 421 i = remap_instruction_operand_from_cache(which); 422 } 423 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 424 jint ref_index = *int_at_addr(i); 425 return extract_low_short_from_int(ref_index); 426 } 427 428 429 430 int ConstantPool::remap_instruction_operand_from_cache(int operand) { 431 int cpc_index = operand; 432 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); 433 assert((int)(u2)cpc_index == cpc_index, "clean u2"); 434 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); 435 return member_index; 436 } 437 438 439 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_cp, KlassHandle k, TRAPS) { 440 if (k->oop_is_instance() || k->oop_is_objArray()) { 441 instanceKlassHandle holder (THREAD, this_cp->pool_holder()); 442 Klass* elem = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); 443 KlassHandle element (THREAD, elem); 444 445 // The element type could be a typeArray - we only need the access check if it is 446 // an reference to another class 447 if (element->oop_is_instance()) { 448 LinkResolver::check_klass_accessability(holder, element, CHECK); 449 } 450 } 451 } 452 453 454 int ConstantPool::name_ref_index_at(int which_nt) { 455 jint ref_index = name_and_type_at(which_nt); 456 return extract_low_short_from_int(ref_index); 457 } 458 459 460 int ConstantPool::signature_ref_index_at(int which_nt) { 461 jint ref_index = name_and_type_at(which_nt); 462 return extract_high_short_from_int(ref_index); 463 } 464 465 466 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { 467 return klass_at(klass_ref_index_at(which), THREAD); 468 } 469 470 471 Symbol* ConstantPool::klass_name_at(int which) { 472 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), 473 "Corrupted constant pool"); 474 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 475 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and 476 // tag is not updated atomicly. 477 CPSlot entry = slot_at(which); 478 if (entry.is_resolved()) { 479 // Already resolved - return entry's name. 480 assert(entry.get_klass()->is_klass(), "must be"); 481 return entry.get_klass()->name(); 482 } else { 483 assert(entry.is_unresolved(), "must be either symbol or klass"); 484 return entry.get_symbol(); 485 } 486 } 487 488 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { 489 jint ref_index = klass_ref_index_at(which); 490 return klass_at_noresolve(ref_index); 491 } 492 493 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { 494 jint ref_index = uncached_klass_ref_index_at(which); 495 return klass_at_noresolve(ref_index); 496 } 497 498 char* ConstantPool::string_at_noresolve(int which) { 499 return unresolved_string_at(which)->as_C_string(); 500 } 501 502 BasicType ConstantPool::basic_type_for_signature_at(int which) { 503 return FieldType::basic_type(symbol_at(which)); 504 } 505 506 507 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_cp, TRAPS) { 508 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused 509 if (this_cp->tag_at(index).is_string()) { 510 this_cp->string_at(index, CHECK); 511 } 512 } 513 } 514 515 // Resolve all the classes in the constant pool. If they are all resolved, 516 // the constant pool is read-only. Enhancement: allocate cp entries to 517 // another metaspace, and copy to read-only or read-write space if this 518 // bit is set. 519 bool ConstantPool::resolve_class_constants(TRAPS) { 520 constantPoolHandle cp(THREAD, this); 521 for (int index = 1; index < length(); index++) { // Index 0 is unused 522 if (tag_at(index).is_unresolved_klass() && 523 klass_at_if_loaded(cp, index) == NULL) { 524 return false; 525 } 526 } 527 // set_preresolution(); or some bit for future use 528 return true; 529 } 530 531 Symbol* ConstantPool::exception_message(constantPoolHandle this_cp, int which, constantTag tag, oop pending_exception) { 532 // Dig out the detailed message to reuse if possible 533 Symbol* message = java_lang_Throwable::detail_message(pending_exception); 534 if (message != NULL) { 535 return message; 536 } 537 538 // Return specific message for the tag 539 switch (tag.value()) { 540 case JVM_CONSTANT_UnresolvedClass: 541 // return the class name in the error message 542 message = this_cp->klass_name_at(which); 543 break; 544 case JVM_CONSTANT_MethodHandle: 545 // return the method handle name in the error message 546 message = this_cp->method_handle_name_ref_at(which); 547 break; 548 case JVM_CONSTANT_MethodType: 549 // return the method type signature in the error message 550 message = this_cp->method_type_signature_at(which); 551 break; 552 default: 553 ShouldNotReachHere(); 554 } 555 556 return message; 557 } 558 559 void ConstantPool::throw_resolution_error(constantPoolHandle this_cp, int which, TRAPS) { 560 Symbol* message = NULL; 561 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message); 562 assert(error != NULL && message != NULL, "checking"); 563 CLEAR_PENDING_EXCEPTION; 564 ResourceMark rm; 565 THROW_MSG(error, message->as_C_string()); 566 } 567 568 // If resolution for Class, MethodHandle or MethodType fails, save the exception 569 // in the resolution error table, so that the same exception is thrown again. 570 void ConstantPool::save_and_throw_exception(constantPoolHandle this_cp, int which, 571 constantTag tag, TRAPS) { 572 Symbol* error = PENDING_EXCEPTION->klass()->name(); 573 574 int error_tag = tag.error_value(); 575 576 if (!PENDING_EXCEPTION-> 577 is_a(SystemDictionary::LinkageError_klass())) { 578 // Just throw the exception and don't prevent these classes from 579 // being loaded due to virtual machine errors like StackOverflow 580 // and OutOfMemoryError, etc, or if the thread was hit by stop() 581 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 582 } else if (this_cp->tag_at(which).value() != error_tag) { 583 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION); 584 SystemDictionary::add_resolution_error(this_cp, which, error, message); 585 // CAS in the tag. If a thread beat us to registering this error that's fine. 586 // If another thread resolved the reference, this is a race condition. This 587 // thread may have had a security manager or something temporary. 588 // This doesn't deterministically get an error. So why do we save this? 589 // We save this because jvmti can add classes to the bootclass path after 590 // this error, so it needs to get the same error if the error is first. 591 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag, 592 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value()); 593 if (old_tag != error_tag && old_tag != tag.value()) { 594 // MethodHandles and MethodType doesn't change to resolved version. 595 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value"); 596 // Forget the exception and use the resolved class. 597 CLEAR_PENDING_EXCEPTION; 598 } 599 } else { 600 // some other thread put this in error state 601 throw_resolution_error(this_cp, which, CHECK); 602 } 603 } 604 605 // Called to resolve constants in the constant pool and return an oop. 606 // Some constant pool entries cache their resolved oop. This is also 607 // called to create oops from constants to use in arguments for invokedynamic 608 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_cp, int index, int cache_index, TRAPS) { 609 oop result_oop = NULL; 610 Handle throw_exception; 611 612 if (cache_index == _possible_index_sentinel) { 613 // It is possible that this constant is one which is cached in the objects. 614 // We'll do a linear search. This should be OK because this usage is rare. 615 assert(index > 0, "valid index"); 616 cache_index = this_cp->cp_to_object_index(index); 617 } 618 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); 619 assert(index == _no_index_sentinel || index >= 0, ""); 620 621 if (cache_index >= 0) { 622 result_oop = this_cp->resolved_references()->obj_at(cache_index); 623 if (result_oop != NULL) { 624 return result_oop; 625 // That was easy... 626 } 627 index = this_cp->object_to_cp_index(cache_index); 628 } 629 630 jvalue prim_value; // temp used only in a few cases below 631 632 constantTag tag = this_cp->tag_at(index); 633 634 switch (tag.value()) { 635 636 case JVM_CONSTANT_UnresolvedClass: 637 case JVM_CONSTANT_UnresolvedClassInError: 638 case JVM_CONSTANT_Class: 639 { 640 assert(cache_index == _no_index_sentinel, "should not have been set"); 641 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL); 642 // ldc wants the java mirror. 643 result_oop = resolved->java_mirror(); 644 break; 645 } 646 647 case JVM_CONSTANT_String: 648 assert(cache_index != _no_index_sentinel, "should have been set"); 649 if (this_cp->is_pseudo_string_at(index)) { 650 result_oop = this_cp->pseudo_string_at(index, cache_index); 651 break; 652 } 653 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL); 654 break; 655 656 case JVM_CONSTANT_MethodHandleInError: 657 case JVM_CONSTANT_MethodTypeInError: 658 { 659 throw_resolution_error(this_cp, index, CHECK_NULL); 660 break; 661 } 662 663 case JVM_CONSTANT_MethodHandle: 664 { 665 int ref_kind = this_cp->method_handle_ref_kind_at(index); 666 int callee_index = this_cp->method_handle_klass_index_at(index); 667 Symbol* name = this_cp->method_handle_name_ref_at(index); 668 Symbol* signature = this_cp->method_handle_signature_ref_at(index); 669 if (PrintMiscellaneous) 670 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", 671 ref_kind, index, this_cp->method_handle_index_at(index), 672 callee_index, name->as_C_string(), signature->as_C_string()); 673 KlassHandle callee; 674 { Klass* k = klass_at_impl(this_cp, callee_index, true, CHECK_NULL); 675 callee = KlassHandle(THREAD, k); 676 } 677 KlassHandle klass(THREAD, this_cp->pool_holder()); 678 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, 679 callee, name, signature, 680 THREAD); 681 result_oop = value(); 682 if (HAS_PENDING_EXCEPTION) { 683 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 684 } 685 break; 686 } 687 688 case JVM_CONSTANT_MethodType: 689 { 690 Symbol* signature = this_cp->method_type_signature_at(index); 691 if (PrintMiscellaneous) 692 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", 693 index, this_cp->method_type_index_at(index), 694 signature->as_C_string()); 695 KlassHandle klass(THREAD, this_cp->pool_holder()); 696 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); 697 result_oop = value(); 698 if (HAS_PENDING_EXCEPTION) { 699 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 700 } 701 break; 702 } 703 704 case JVM_CONSTANT_Integer: 705 assert(cache_index == _no_index_sentinel, "should not have been set"); 706 prim_value.i = this_cp->int_at(index); 707 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); 708 break; 709 710 case JVM_CONSTANT_Float: 711 assert(cache_index == _no_index_sentinel, "should not have been set"); 712 prim_value.f = this_cp->float_at(index); 713 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); 714 break; 715 716 case JVM_CONSTANT_Long: 717 assert(cache_index == _no_index_sentinel, "should not have been set"); 718 prim_value.j = this_cp->long_at(index); 719 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); 720 break; 721 722 case JVM_CONSTANT_Double: 723 assert(cache_index == _no_index_sentinel, "should not have been set"); 724 prim_value.d = this_cp->double_at(index); 725 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); 726 break; 727 728 default: 729 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", 730 this_cp(), index, cache_index, tag.value())); 731 assert(false, "unexpected constant tag"); 732 break; 733 } 734 735 if (cache_index >= 0) { 736 // Benign race condition: resolved_references may already be filled in. 737 // The important thing here is that all threads pick up the same result. 738 // It doesn't matter which racing thread wins, as long as only one 739 // result is used by all threads, and all future queries. 740 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL); 741 if (old_result == NULL) { 742 return result_oop; // was installed 743 } else { 744 // Return the winning thread's result. This can be different than 745 // the result here for MethodHandles. 746 return old_result; 747 } 748 } else { 749 return result_oop; 750 } 751 } 752 753 oop ConstantPool::uncached_string_at(int which, TRAPS) { 754 Symbol* sym = unresolved_string_at(which); 755 oop str = StringTable::intern(sym, CHECK_(NULL)); 756 assert(java_lang_String::is_instance(str), "must be string"); 757 return str; 758 } 759 760 761 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_cp, int index, TRAPS) { 762 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); 763 764 Handle bsm; 765 int argc; 766 { 767 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments 768 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. 769 // It is accompanied by the optional arguments. 770 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index); 771 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); 772 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { 773 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); 774 } 775 776 // Extract the optional static arguments. 777 argc = this_cp->invoke_dynamic_argument_count_at(index); 778 if (argc == 0) return bsm_oop; 779 780 bsm = Handle(THREAD, bsm_oop); 781 } 782 783 objArrayHandle info; 784 { 785 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); 786 info = objArrayHandle(THREAD, info_oop); 787 } 788 789 info->obj_at_put(0, bsm()); 790 for (int i = 0; i < argc; i++) { 791 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i); 792 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); 793 info->obj_at_put(1+i, arg_oop); 794 } 795 796 return info(); 797 } 798 799 oop ConstantPool::string_at_impl(constantPoolHandle this_cp, int which, int obj_index, TRAPS) { 800 // If the string has already been interned, this entry will be non-null 801 oop str = this_cp->resolved_references()->obj_at(obj_index); 802 if (str != NULL) return str; 803 Symbol* sym = this_cp->unresolved_string_at(which); 804 str = StringTable::intern(sym, CHECK_(NULL)); 805 this_cp->string_at_put(which, obj_index, str); 806 assert(java_lang_String::is_instance(str), "must be string"); 807 return str; 808 } 809 810 811 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, 812 int which) { 813 // Names are interned, so we can compare Symbol*s directly 814 Symbol* cp_name = klass_name_at(which); 815 return (cp_name == k->name()); 816 } 817 818 819 // Iterate over symbols and decrement ones which are Symbol*s 820 // This is done during GC. 821 // Only decrement the UTF8 symbols. Unresolved classes and strings point to 822 // these symbols but didn't increment the reference count. 823 void ConstantPool::unreference_symbols() { 824 for (int index = 1; index < length(); index++) { // Index 0 is unused 825 constantTag tag = tag_at(index); 826 if (tag.is_symbol()) { 827 symbol_at(index)->decrement_refcount(); 828 } 829 } 830 } 831 832 833 // Compare this constant pool's entry at index1 to the constant pool 834 // cp2's entry at index2. 835 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2, 836 int index2, TRAPS) { 837 838 // The error tags are equivalent to non-error tags when comparing 839 jbyte t1 = tag_at(index1).non_error_value(); 840 jbyte t2 = cp2->tag_at(index2).non_error_value(); 841 842 if (t1 != t2) { 843 // Not the same entry type so there is nothing else to check. Note 844 // that this style of checking will consider resolved/unresolved 845 // class pairs as different. 846 // From the ConstantPool* API point of view, this is correct 847 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this 848 // plays out in the context of ConstantPool* merging. 849 return false; 850 } 851 852 switch (t1) { 853 case JVM_CONSTANT_Class: 854 { 855 Klass* k1 = klass_at(index1, CHECK_false); 856 Klass* k2 = cp2->klass_at(index2, CHECK_false); 857 if (k1 == k2) { 858 return true; 859 } 860 } break; 861 862 case JVM_CONSTANT_ClassIndex: 863 { 864 int recur1 = klass_index_at(index1); 865 int recur2 = cp2->klass_index_at(index2); 866 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 867 if (match) { 868 return true; 869 } 870 } break; 871 872 case JVM_CONSTANT_Double: 873 { 874 jdouble d1 = double_at(index1); 875 jdouble d2 = cp2->double_at(index2); 876 if (d1 == d2) { 877 return true; 878 } 879 } break; 880 881 case JVM_CONSTANT_Fieldref: 882 case JVM_CONSTANT_InterfaceMethodref: 883 case JVM_CONSTANT_Methodref: 884 { 885 int recur1 = uncached_klass_ref_index_at(index1); 886 int recur2 = cp2->uncached_klass_ref_index_at(index2); 887 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 888 if (match) { 889 recur1 = uncached_name_and_type_ref_index_at(index1); 890 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); 891 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 892 if (match) { 893 return true; 894 } 895 } 896 } break; 897 898 case JVM_CONSTANT_Float: 899 { 900 jfloat f1 = float_at(index1); 901 jfloat f2 = cp2->float_at(index2); 902 if (f1 == f2) { 903 return true; 904 } 905 } break; 906 907 case JVM_CONSTANT_Integer: 908 { 909 jint i1 = int_at(index1); 910 jint i2 = cp2->int_at(index2); 911 if (i1 == i2) { 912 return true; 913 } 914 } break; 915 916 case JVM_CONSTANT_Long: 917 { 918 jlong l1 = long_at(index1); 919 jlong l2 = cp2->long_at(index2); 920 if (l1 == l2) { 921 return true; 922 } 923 } break; 924 925 case JVM_CONSTANT_NameAndType: 926 { 927 int recur1 = name_ref_index_at(index1); 928 int recur2 = cp2->name_ref_index_at(index2); 929 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 930 if (match) { 931 recur1 = signature_ref_index_at(index1); 932 recur2 = cp2->signature_ref_index_at(index2); 933 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 934 if (match) { 935 return true; 936 } 937 } 938 } break; 939 940 case JVM_CONSTANT_StringIndex: 941 { 942 int recur1 = string_index_at(index1); 943 int recur2 = cp2->string_index_at(index2); 944 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 945 if (match) { 946 return true; 947 } 948 } break; 949 950 case JVM_CONSTANT_UnresolvedClass: 951 { 952 Symbol* k1 = klass_name_at(index1); 953 Symbol* k2 = cp2->klass_name_at(index2); 954 if (k1 == k2) { 955 return true; 956 } 957 } break; 958 959 case JVM_CONSTANT_MethodType: 960 { 961 int k1 = method_type_index_at_error_ok(index1); 962 int k2 = cp2->method_type_index_at_error_ok(index2); 963 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 964 if (match) { 965 return true; 966 } 967 } break; 968 969 case JVM_CONSTANT_MethodHandle: 970 { 971 int k1 = method_handle_ref_kind_at_error_ok(index1); 972 int k2 = cp2->method_handle_ref_kind_at_error_ok(index2); 973 if (k1 == k2) { 974 int i1 = method_handle_index_at_error_ok(index1); 975 int i2 = cp2->method_handle_index_at_error_ok(index2); 976 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); 977 if (match) { 978 return true; 979 } 980 } 981 } break; 982 983 case JVM_CONSTANT_InvokeDynamic: 984 { 985 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); 986 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); 987 int i1 = invoke_dynamic_bootstrap_specifier_index(index1); 988 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); 989 // separate statements and variables because CHECK_false is used 990 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); 991 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); 992 return (match_entry && match_operand); 993 } break; 994 995 case JVM_CONSTANT_String: 996 { 997 Symbol* s1 = unresolved_string_at(index1); 998 Symbol* s2 = cp2->unresolved_string_at(index2); 999 if (s1 == s2) { 1000 return true; 1001 } 1002 } break; 1003 1004 case JVM_CONSTANT_Utf8: 1005 { 1006 Symbol* s1 = symbol_at(index1); 1007 Symbol* s2 = cp2->symbol_at(index2); 1008 if (s1 == s2) { 1009 return true; 1010 } 1011 } break; 1012 1013 // Invalid is used as the tag for the second constant pool entry 1014 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1015 // not be seen by itself. 1016 case JVM_CONSTANT_Invalid: // fall through 1017 1018 default: 1019 ShouldNotReachHere(); 1020 break; 1021 } 1022 1023 return false; 1024 } // end compare_entry_to() 1025 1026 1027 // Resize the operands array with delta_len and delta_size. 1028 // Used in RedefineClasses for CP merge. 1029 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { 1030 int old_len = operand_array_length(operands()); 1031 int new_len = old_len + delta_len; 1032 int min_len = (delta_len > 0) ? old_len : new_len; 1033 1034 int old_size = operands()->length(); 1035 int new_size = old_size + delta_size; 1036 int min_size = (delta_size > 0) ? old_size : new_size; 1037 1038 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1039 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); 1040 1041 // Set index in the resized array for existing elements only 1042 for (int idx = 0; idx < min_len; idx++) { 1043 int offset = operand_offset_at(idx); // offset in original array 1044 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array 1045 } 1046 // Copy the bootstrap specifiers only 1047 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), 1048 new_ops->adr_at(2*new_len), 1049 (min_size - 2*min_len) * sizeof(u2)); 1050 // Explicitly deallocate old operands array. 1051 // Note, it is not needed for 7u backport. 1052 if ( operands() != NULL) { // the safety check 1053 MetadataFactory::free_array<u2>(loader_data, operands()); 1054 } 1055 set_operands(new_ops); 1056 } // end resize_operands() 1057 1058 1059 // Extend the operands array with the length and size of the ext_cp operands. 1060 // Used in RedefineClasses for CP merge. 1061 void ConstantPool::extend_operands(constantPoolHandle ext_cp, TRAPS) { 1062 int delta_len = operand_array_length(ext_cp->operands()); 1063 if (delta_len == 0) { 1064 return; // nothing to do 1065 } 1066 int delta_size = ext_cp->operands()->length(); 1067 1068 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); 1069 1070 if (operand_array_length(operands()) == 0) { 1071 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1072 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); 1073 // The first element index defines the offset of second part 1074 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array 1075 set_operands(new_ops); 1076 } else { 1077 resize_operands(delta_len, delta_size, CHECK); 1078 } 1079 1080 } // end extend_operands() 1081 1082 1083 // Shrink the operands array to a smaller array with new_len length. 1084 // Used in RedefineClasses for CP merge. 1085 void ConstantPool::shrink_operands(int new_len, TRAPS) { 1086 int old_len = operand_array_length(operands()); 1087 if (new_len == old_len) { 1088 return; // nothing to do 1089 } 1090 assert(new_len < old_len, "shrunken operands array must be smaller"); 1091 1092 int free_base = operand_next_offset_at(new_len - 1); 1093 int delta_len = new_len - old_len; 1094 int delta_size = 2*delta_len + free_base - operands()->length(); 1095 1096 resize_operands(delta_len, delta_size, CHECK); 1097 1098 } // end shrink_operands() 1099 1100 1101 void ConstantPool::copy_operands(constantPoolHandle from_cp, 1102 constantPoolHandle to_cp, 1103 TRAPS) { 1104 1105 int from_oplen = operand_array_length(from_cp->operands()); 1106 int old_oplen = operand_array_length(to_cp->operands()); 1107 if (from_oplen != 0) { 1108 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); 1109 // append my operands to the target's operands array 1110 if (old_oplen == 0) { 1111 // Can't just reuse from_cp's operand list because of deallocation issues 1112 int len = from_cp->operands()->length(); 1113 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); 1114 Copy::conjoint_memory_atomic( 1115 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); 1116 to_cp->set_operands(new_ops); 1117 } else { 1118 int old_len = to_cp->operands()->length(); 1119 int from_len = from_cp->operands()->length(); 1120 int old_off = old_oplen * sizeof(u2); 1121 int from_off = from_oplen * sizeof(u2); 1122 // Use the metaspace for the destination constant pool 1123 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); 1124 int fillp = 0, len = 0; 1125 // first part of dest 1126 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), 1127 new_operands->adr_at(fillp), 1128 (len = old_off) * sizeof(u2)); 1129 fillp += len; 1130 // first part of src 1131 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), 1132 new_operands->adr_at(fillp), 1133 (len = from_off) * sizeof(u2)); 1134 fillp += len; 1135 // second part of dest 1136 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), 1137 new_operands->adr_at(fillp), 1138 (len = old_len - old_off) * sizeof(u2)); 1139 fillp += len; 1140 // second part of src 1141 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), 1142 new_operands->adr_at(fillp), 1143 (len = from_len - from_off) * sizeof(u2)); 1144 fillp += len; 1145 assert(fillp == new_operands->length(), ""); 1146 1147 // Adjust indexes in the first part of the copied operands array. 1148 for (int j = 0; j < from_oplen; j++) { 1149 int offset = operand_offset_at(new_operands, old_oplen + j); 1150 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); 1151 offset += old_len; // every new tuple is preceded by old_len extra u2's 1152 operand_offset_at_put(new_operands, old_oplen + j, offset); 1153 } 1154 1155 // replace target operands array with combined array 1156 to_cp->set_operands(new_operands); 1157 } 1158 } 1159 } // end copy_operands() 1160 1161 1162 // Copy this constant pool's entries at start_i to end_i (inclusive) 1163 // to the constant pool to_cp's entries starting at to_i. A total of 1164 // (end_i - start_i) + 1 entries are copied. 1165 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, 1166 constantPoolHandle to_cp, int to_i, TRAPS) { 1167 1168 1169 int dest_i = to_i; // leave original alone for debug purposes 1170 1171 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { 1172 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); 1173 1174 switch (from_cp->tag_at(src_i).value()) { 1175 case JVM_CONSTANT_Double: 1176 case JVM_CONSTANT_Long: 1177 // double and long take two constant pool entries 1178 src_i += 2; 1179 dest_i += 2; 1180 break; 1181 1182 default: 1183 // all others take one constant pool entry 1184 src_i++; 1185 dest_i++; 1186 break; 1187 } 1188 } 1189 copy_operands(from_cp, to_cp, CHECK); 1190 1191 } // end copy_cp_to_impl() 1192 1193 1194 // Copy this constant pool's entry at from_i to the constant pool 1195 // to_cp's entry at to_i. 1196 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i, 1197 constantPoolHandle to_cp, int to_i, 1198 TRAPS) { 1199 1200 int tag = from_cp->tag_at(from_i).value(); 1201 switch (tag) { 1202 case JVM_CONSTANT_Class: 1203 { 1204 Klass* k = from_cp->klass_at(from_i, CHECK); 1205 to_cp->klass_at_put(to_i, k); 1206 } break; 1207 1208 case JVM_CONSTANT_ClassIndex: 1209 { 1210 jint ki = from_cp->klass_index_at(from_i); 1211 to_cp->klass_index_at_put(to_i, ki); 1212 } break; 1213 1214 case JVM_CONSTANT_Double: 1215 { 1216 jdouble d = from_cp->double_at(from_i); 1217 to_cp->double_at_put(to_i, d); 1218 // double takes two constant pool entries so init second entry's tag 1219 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1220 } break; 1221 1222 case JVM_CONSTANT_Fieldref: 1223 { 1224 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1225 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1226 to_cp->field_at_put(to_i, class_index, name_and_type_index); 1227 } break; 1228 1229 case JVM_CONSTANT_Float: 1230 { 1231 jfloat f = from_cp->float_at(from_i); 1232 to_cp->float_at_put(to_i, f); 1233 } break; 1234 1235 case JVM_CONSTANT_Integer: 1236 { 1237 jint i = from_cp->int_at(from_i); 1238 to_cp->int_at_put(to_i, i); 1239 } break; 1240 1241 case JVM_CONSTANT_InterfaceMethodref: 1242 { 1243 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1244 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1245 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); 1246 } break; 1247 1248 case JVM_CONSTANT_Long: 1249 { 1250 jlong l = from_cp->long_at(from_i); 1251 to_cp->long_at_put(to_i, l); 1252 // long takes two constant pool entries so init second entry's tag 1253 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1254 } break; 1255 1256 case JVM_CONSTANT_Methodref: 1257 { 1258 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1259 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1260 to_cp->method_at_put(to_i, class_index, name_and_type_index); 1261 } break; 1262 1263 case JVM_CONSTANT_NameAndType: 1264 { 1265 int name_ref_index = from_cp->name_ref_index_at(from_i); 1266 int signature_ref_index = from_cp->signature_ref_index_at(from_i); 1267 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); 1268 } break; 1269 1270 case JVM_CONSTANT_StringIndex: 1271 { 1272 jint si = from_cp->string_index_at(from_i); 1273 to_cp->string_index_at_put(to_i, si); 1274 } break; 1275 1276 case JVM_CONSTANT_UnresolvedClass: 1277 case JVM_CONSTANT_UnresolvedClassInError: 1278 { 1279 // Can be resolved after checking tag, so check the slot first. 1280 CPSlot entry = from_cp->slot_at(from_i); 1281 if (entry.is_resolved()) { 1282 assert(entry.get_klass()->is_klass(), "must be"); 1283 // Already resolved 1284 to_cp->klass_at_put(to_i, entry.get_klass()); 1285 } else { 1286 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); 1287 } 1288 } break; 1289 1290 case JVM_CONSTANT_String: 1291 { 1292 Symbol* s = from_cp->unresolved_string_at(from_i); 1293 to_cp->unresolved_string_at_put(to_i, s); 1294 } break; 1295 1296 case JVM_CONSTANT_Utf8: 1297 { 1298 Symbol* s = from_cp->symbol_at(from_i); 1299 // Need to increase refcount, the old one will be thrown away and deferenced 1300 s->increment_refcount(); 1301 to_cp->symbol_at_put(to_i, s); 1302 } break; 1303 1304 case JVM_CONSTANT_MethodType: 1305 case JVM_CONSTANT_MethodTypeInError: 1306 { 1307 jint k = from_cp->method_type_index_at_error_ok(from_i); 1308 to_cp->method_type_index_at_put(to_i, k); 1309 } break; 1310 1311 case JVM_CONSTANT_MethodHandle: 1312 case JVM_CONSTANT_MethodHandleInError: 1313 { 1314 int k1 = from_cp->method_handle_ref_kind_at_error_ok(from_i); 1315 int k2 = from_cp->method_handle_index_at_error_ok(from_i); 1316 to_cp->method_handle_index_at_put(to_i, k1, k2); 1317 } break; 1318 1319 case JVM_CONSTANT_InvokeDynamic: 1320 { 1321 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); 1322 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); 1323 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1324 to_cp->invoke_dynamic_at_put(to_i, k1, k2); 1325 } break; 1326 1327 // Invalid is used as the tag for the second constant pool entry 1328 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1329 // not be seen by itself. 1330 case JVM_CONSTANT_Invalid: // fall through 1331 1332 default: 1333 { 1334 ShouldNotReachHere(); 1335 } break; 1336 } 1337 } // end copy_entry_to() 1338 1339 1340 // Search constant pool search_cp for an entry that matches this 1341 // constant pool's entry at pattern_i. Returns the index of a 1342 // matching entry or zero (0) if there is no matching entry. 1343 int ConstantPool::find_matching_entry(int pattern_i, 1344 constantPoolHandle search_cp, TRAPS) { 1345 1346 // index zero (0) is not used 1347 for (int i = 1; i < search_cp->length(); i++) { 1348 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); 1349 if (found) { 1350 return i; 1351 } 1352 } 1353 1354 return 0; // entry not found; return unused index zero (0) 1355 } // end find_matching_entry() 1356 1357 1358 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool 1359 // cp2's bootstrap specifier at idx2. 1360 bool ConstantPool::compare_operand_to(int idx1, constantPoolHandle cp2, int idx2, TRAPS) { 1361 int k1 = operand_bootstrap_method_ref_index_at(idx1); 1362 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); 1363 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1364 1365 if (!match) { 1366 return false; 1367 } 1368 int argc = operand_argument_count_at(idx1); 1369 if (argc == cp2->operand_argument_count_at(idx2)) { 1370 for (int j = 0; j < argc; j++) { 1371 k1 = operand_argument_index_at(idx1, j); 1372 k2 = cp2->operand_argument_index_at(idx2, j); 1373 match = compare_entry_to(k1, cp2, k2, CHECK_false); 1374 if (!match) { 1375 return false; 1376 } 1377 } 1378 return true; // got through loop; all elements equal 1379 } 1380 return false; 1381 } // end compare_operand_to() 1382 1383 // Search constant pool search_cp for a bootstrap specifier that matches 1384 // this constant pool's bootstrap specifier at pattern_i index. 1385 // Return the index of a matching bootstrap specifier or (-1) if there is no match. 1386 int ConstantPool::find_matching_operand(int pattern_i, 1387 constantPoolHandle search_cp, int search_len, TRAPS) { 1388 for (int i = 0; i < search_len; i++) { 1389 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); 1390 if (found) { 1391 return i; 1392 } 1393 } 1394 return -1; // bootstrap specifier not found; return unused index (-1) 1395 } // end find_matching_operand() 1396 1397 1398 #ifndef PRODUCT 1399 1400 const char* ConstantPool::printable_name_at(int which) { 1401 1402 constantTag tag = tag_at(which); 1403 1404 if (tag.is_string()) { 1405 return string_at_noresolve(which); 1406 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 1407 return klass_name_at(which)->as_C_string(); 1408 } else if (tag.is_symbol()) { 1409 return symbol_at(which)->as_C_string(); 1410 } 1411 return ""; 1412 } 1413 1414 #endif // PRODUCT 1415 1416 1417 // JVMTI GetConstantPool support 1418 1419 // For debugging of constant pool 1420 const bool debug_cpool = false; 1421 1422 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) 1423 1424 static void print_cpool_bytes(jint cnt, u1 *bytes) { 1425 const char* WARN_MSG = "Must not be such entry!"; 1426 jint size = 0; 1427 u2 idx1, idx2; 1428 1429 for (jint idx = 1; idx < cnt; idx++) { 1430 jint ent_size = 0; 1431 u1 tag = *bytes++; 1432 size++; // count tag 1433 1434 printf("const #%03d, tag: %02d ", idx, tag); 1435 switch(tag) { 1436 case JVM_CONSTANT_Invalid: { 1437 printf("Invalid"); 1438 break; 1439 } 1440 case JVM_CONSTANT_Unicode: { 1441 printf("Unicode %s", WARN_MSG); 1442 break; 1443 } 1444 case JVM_CONSTANT_Utf8: { 1445 u2 len = Bytes::get_Java_u2(bytes); 1446 char str[128]; 1447 if (len > 127) { 1448 len = 127; 1449 } 1450 strncpy(str, (char *) (bytes+2), len); 1451 str[len] = '\0'; 1452 printf("Utf8 \"%s\"", str); 1453 ent_size = 2 + len; 1454 break; 1455 } 1456 case JVM_CONSTANT_Integer: { 1457 u4 val = Bytes::get_Java_u4(bytes); 1458 printf("int %d", *(int *) &val); 1459 ent_size = 4; 1460 break; 1461 } 1462 case JVM_CONSTANT_Float: { 1463 u4 val = Bytes::get_Java_u4(bytes); 1464 printf("float %5.3ff", *(float *) &val); 1465 ent_size = 4; 1466 break; 1467 } 1468 case JVM_CONSTANT_Long: { 1469 u8 val = Bytes::get_Java_u8(bytes); 1470 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val); 1471 ent_size = 8; 1472 idx++; // Long takes two cpool slots 1473 break; 1474 } 1475 case JVM_CONSTANT_Double: { 1476 u8 val = Bytes::get_Java_u8(bytes); 1477 printf("double %5.3fd", *(jdouble *)&val); 1478 ent_size = 8; 1479 idx++; // Double takes two cpool slots 1480 break; 1481 } 1482 case JVM_CONSTANT_Class: { 1483 idx1 = Bytes::get_Java_u2(bytes); 1484 printf("class #%03d", idx1); 1485 ent_size = 2; 1486 break; 1487 } 1488 case JVM_CONSTANT_String: { 1489 idx1 = Bytes::get_Java_u2(bytes); 1490 printf("String #%03d", idx1); 1491 ent_size = 2; 1492 break; 1493 } 1494 case JVM_CONSTANT_Fieldref: { 1495 idx1 = Bytes::get_Java_u2(bytes); 1496 idx2 = Bytes::get_Java_u2(bytes+2); 1497 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); 1498 ent_size = 4; 1499 break; 1500 } 1501 case JVM_CONSTANT_Methodref: { 1502 idx1 = Bytes::get_Java_u2(bytes); 1503 idx2 = Bytes::get_Java_u2(bytes+2); 1504 printf("Method #%03d, #%03d", idx1, idx2); 1505 ent_size = 4; 1506 break; 1507 } 1508 case JVM_CONSTANT_InterfaceMethodref: { 1509 idx1 = Bytes::get_Java_u2(bytes); 1510 idx2 = Bytes::get_Java_u2(bytes+2); 1511 printf("InterfMethod #%03d, #%03d", idx1, idx2); 1512 ent_size = 4; 1513 break; 1514 } 1515 case JVM_CONSTANT_NameAndType: { 1516 idx1 = Bytes::get_Java_u2(bytes); 1517 idx2 = Bytes::get_Java_u2(bytes+2); 1518 printf("NameAndType #%03d, #%03d", idx1, idx2); 1519 ent_size = 4; 1520 break; 1521 } 1522 case JVM_CONSTANT_ClassIndex: { 1523 printf("ClassIndex %s", WARN_MSG); 1524 break; 1525 } 1526 case JVM_CONSTANT_UnresolvedClass: { 1527 printf("UnresolvedClass: %s", WARN_MSG); 1528 break; 1529 } 1530 case JVM_CONSTANT_UnresolvedClassInError: { 1531 printf("UnresolvedClassInErr: %s", WARN_MSG); 1532 break; 1533 } 1534 case JVM_CONSTANT_StringIndex: { 1535 printf("StringIndex: %s", WARN_MSG); 1536 break; 1537 } 1538 } 1539 printf(";\n"); 1540 bytes += ent_size; 1541 size += ent_size; 1542 } 1543 printf("Cpool size: %d\n", size); 1544 fflush(0); 1545 return; 1546 } /* end print_cpool_bytes */ 1547 1548 1549 // Returns size of constant pool entry. 1550 jint ConstantPool::cpool_entry_size(jint idx) { 1551 switch(tag_at(idx).value()) { 1552 case JVM_CONSTANT_Invalid: 1553 case JVM_CONSTANT_Unicode: 1554 return 1; 1555 1556 case JVM_CONSTANT_Utf8: 1557 return 3 + symbol_at(idx)->utf8_length(); 1558 1559 case JVM_CONSTANT_Class: 1560 case JVM_CONSTANT_String: 1561 case JVM_CONSTANT_ClassIndex: 1562 case JVM_CONSTANT_UnresolvedClass: 1563 case JVM_CONSTANT_UnresolvedClassInError: 1564 case JVM_CONSTANT_StringIndex: 1565 case JVM_CONSTANT_MethodType: 1566 case JVM_CONSTANT_MethodTypeInError: 1567 return 3; 1568 1569 case JVM_CONSTANT_MethodHandle: 1570 case JVM_CONSTANT_MethodHandleInError: 1571 return 4; //tag, ref_kind, ref_index 1572 1573 case JVM_CONSTANT_Integer: 1574 case JVM_CONSTANT_Float: 1575 case JVM_CONSTANT_Fieldref: 1576 case JVM_CONSTANT_Methodref: 1577 case JVM_CONSTANT_InterfaceMethodref: 1578 case JVM_CONSTANT_NameAndType: 1579 return 5; 1580 1581 case JVM_CONSTANT_InvokeDynamic: 1582 // u1 tag, u2 bsm, u2 nt 1583 return 5; 1584 1585 case JVM_CONSTANT_Long: 1586 case JVM_CONSTANT_Double: 1587 return 9; 1588 } 1589 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); 1590 return 1; 1591 } /* end cpool_entry_size */ 1592 1593 1594 // SymbolHashMap is used to find a constant pool index from a string. 1595 // This function fills in SymbolHashMaps, one for utf8s and one for 1596 // class names, returns size of the cpool raw bytes. 1597 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, 1598 SymbolHashMap *classmap) { 1599 jint size = 0; 1600 1601 for (u2 idx = 1; idx < length(); idx++) { 1602 u2 tag = tag_at(idx).value(); 1603 size += cpool_entry_size(idx); 1604 1605 switch(tag) { 1606 case JVM_CONSTANT_Utf8: { 1607 Symbol* sym = symbol_at(idx); 1608 symmap->add_entry(sym, idx); 1609 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); 1610 break; 1611 } 1612 case JVM_CONSTANT_Class: 1613 case JVM_CONSTANT_UnresolvedClass: 1614 case JVM_CONSTANT_UnresolvedClassInError: { 1615 Symbol* sym = klass_name_at(idx); 1616 classmap->add_entry(sym, idx); 1617 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); 1618 break; 1619 } 1620 case JVM_CONSTANT_Long: 1621 case JVM_CONSTANT_Double: { 1622 idx++; // Both Long and Double take two cpool slots 1623 break; 1624 } 1625 } 1626 } 1627 return size; 1628 } /* end hash_utf8_entries_to */ 1629 1630 1631 // Copy cpool bytes. 1632 // Returns: 1633 // 0, in case of OutOfMemoryError 1634 // -1, in case of internal error 1635 // > 0, count of the raw cpool bytes that have been copied 1636 int ConstantPool::copy_cpool_bytes(int cpool_size, 1637 SymbolHashMap* tbl, 1638 unsigned char *bytes) { 1639 u2 idx1, idx2; 1640 jint size = 0; 1641 jint cnt = length(); 1642 unsigned char *start_bytes = bytes; 1643 1644 for (jint idx = 1; idx < cnt; idx++) { 1645 u1 tag = tag_at(idx).value(); 1646 jint ent_size = cpool_entry_size(idx); 1647 1648 assert(size + ent_size <= cpool_size, "Size mismatch"); 1649 1650 *bytes = tag; 1651 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); 1652 switch(tag) { 1653 case JVM_CONSTANT_Invalid: { 1654 DBG(printf("JVM_CONSTANT_Invalid")); 1655 break; 1656 } 1657 case JVM_CONSTANT_Unicode: { 1658 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); 1659 DBG(printf("JVM_CONSTANT_Unicode")); 1660 break; 1661 } 1662 case JVM_CONSTANT_Utf8: { 1663 Symbol* sym = symbol_at(idx); 1664 char* str = sym->as_utf8(); 1665 // Warning! It's crashing on x86 with len = sym->utf8_length() 1666 int len = (int) strlen(str); 1667 Bytes::put_Java_u2((address) (bytes+1), (u2) len); 1668 for (int i = 0; i < len; i++) { 1669 bytes[3+i] = (u1) str[i]; 1670 } 1671 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); 1672 break; 1673 } 1674 case JVM_CONSTANT_Integer: { 1675 jint val = int_at(idx); 1676 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1677 break; 1678 } 1679 case JVM_CONSTANT_Float: { 1680 jfloat val = float_at(idx); 1681 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1682 break; 1683 } 1684 case JVM_CONSTANT_Long: { 1685 jlong val = long_at(idx); 1686 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1687 idx++; // Long takes two cpool slots 1688 break; 1689 } 1690 case JVM_CONSTANT_Double: { 1691 jdouble val = double_at(idx); 1692 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1693 idx++; // Double takes two cpool slots 1694 break; 1695 } 1696 case JVM_CONSTANT_Class: 1697 case JVM_CONSTANT_UnresolvedClass: 1698 case JVM_CONSTANT_UnresolvedClassInError: { 1699 *bytes = JVM_CONSTANT_Class; 1700 Symbol* sym = klass_name_at(idx); 1701 idx1 = tbl->symbol_to_value(sym); 1702 assert(idx1 != 0, "Have not found a hashtable entry"); 1703 Bytes::put_Java_u2((address) (bytes+1), idx1); 1704 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); 1705 break; 1706 } 1707 case JVM_CONSTANT_String: { 1708 *bytes = JVM_CONSTANT_String; 1709 Symbol* sym = unresolved_string_at(idx); 1710 idx1 = tbl->symbol_to_value(sym); 1711 assert(idx1 != 0, "Have not found a hashtable entry"); 1712 Bytes::put_Java_u2((address) (bytes+1), idx1); 1713 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); 1714 break; 1715 } 1716 case JVM_CONSTANT_Fieldref: 1717 case JVM_CONSTANT_Methodref: 1718 case JVM_CONSTANT_InterfaceMethodref: { 1719 idx1 = uncached_klass_ref_index_at(idx); 1720 idx2 = uncached_name_and_type_ref_index_at(idx); 1721 Bytes::put_Java_u2((address) (bytes+1), idx1); 1722 Bytes::put_Java_u2((address) (bytes+3), idx2); 1723 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); 1724 break; 1725 } 1726 case JVM_CONSTANT_NameAndType: { 1727 idx1 = name_ref_index_at(idx); 1728 idx2 = signature_ref_index_at(idx); 1729 Bytes::put_Java_u2((address) (bytes+1), idx1); 1730 Bytes::put_Java_u2((address) (bytes+3), idx2); 1731 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); 1732 break; 1733 } 1734 case JVM_CONSTANT_ClassIndex: { 1735 *bytes = JVM_CONSTANT_Class; 1736 idx1 = klass_index_at(idx); 1737 Bytes::put_Java_u2((address) (bytes+1), idx1); 1738 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); 1739 break; 1740 } 1741 case JVM_CONSTANT_StringIndex: { 1742 *bytes = JVM_CONSTANT_String; 1743 idx1 = string_index_at(idx); 1744 Bytes::put_Java_u2((address) (bytes+1), idx1); 1745 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); 1746 break; 1747 } 1748 case JVM_CONSTANT_MethodHandle: 1749 case JVM_CONSTANT_MethodHandleInError: { 1750 *bytes = JVM_CONSTANT_MethodHandle; 1751 int kind = method_handle_ref_kind_at_error_ok(idx); 1752 idx1 = method_handle_index_at_error_ok(idx); 1753 *(bytes+1) = (unsigned char) kind; 1754 Bytes::put_Java_u2((address) (bytes+2), idx1); 1755 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); 1756 break; 1757 } 1758 case JVM_CONSTANT_MethodType: 1759 case JVM_CONSTANT_MethodTypeInError: { 1760 *bytes = JVM_CONSTANT_MethodType; 1761 idx1 = method_type_index_at_error_ok(idx); 1762 Bytes::put_Java_u2((address) (bytes+1), idx1); 1763 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); 1764 break; 1765 } 1766 case JVM_CONSTANT_InvokeDynamic: { 1767 *bytes = tag; 1768 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 1769 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 1770 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); 1771 Bytes::put_Java_u2((address) (bytes+1), idx1); 1772 Bytes::put_Java_u2((address) (bytes+3), idx2); 1773 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); 1774 break; 1775 } 1776 } 1777 DBG(printf("\n")); 1778 bytes += ent_size; 1779 size += ent_size; 1780 } 1781 assert(size == cpool_size, "Size mismatch"); 1782 1783 // Keep temorarily for debugging until it's stable. 1784 DBG(print_cpool_bytes(cnt, start_bytes)); 1785 return (int)(bytes - start_bytes); 1786 } /* end copy_cpool_bytes */ 1787 1788 #undef DBG 1789 1790 1791 void ConstantPool::set_on_stack(const bool value) { 1792 if (value) { 1793 // Only record if it's not already set. 1794 if (!on_stack()) { 1795 _flags |= _on_stack; 1796 MetadataOnStackMark::record(this); 1797 } 1798 } else { 1799 // Clearing is done single-threadedly. 1800 _flags &= ~_on_stack; 1801 } 1802 } 1803 1804 // JSR 292 support for patching constant pool oops after the class is linked and 1805 // the oop array for resolved references are created. 1806 // We can't do this during classfile parsing, which is how the other indexes are 1807 // patched. The other patches are applied early for some error checking 1808 // so only defer the pseudo_strings. 1809 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) { 1810 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused 1811 Handle patch = cp_patches->at(index); 1812 if (patch.not_null()) { 1813 assert (tag_at(index).is_string(), "should only be string left"); 1814 // Patching a string means pre-resolving it. 1815 // The spelling in the constant pool is ignored. 1816 // The constant reference may be any object whatever. 1817 // If it is not a real interned string, the constant is referred 1818 // to as a "pseudo-string", and must be presented to the CP 1819 // explicitly, because it may require scavenging. 1820 int obj_index = cp_to_object_index(index); 1821 pseudo_string_at_put(index, obj_index, patch()); 1822 DEBUG_ONLY(cp_patches->at_put(index, Handle());) 1823 } 1824 } 1825 #ifdef ASSERT 1826 // Ensure that all the patches have been used. 1827 for (int index = 0; index < cp_patches->length(); index++) { 1828 assert(cp_patches->at(index).is_null(), 1829 err_msg("Unused constant pool patch at %d in class file %s", 1830 index, 1831 pool_holder()->external_name())); 1832 } 1833 #endif // ASSERT 1834 } 1835 1836 #ifndef PRODUCT 1837 1838 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool 1839 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { 1840 guarantee(obj->is_constantPool(), "object must be constant pool"); 1841 constantPoolHandle cp(THREAD, (ConstantPool*)obj); 1842 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); 1843 1844 for (int i = 0; i< cp->length(); i++) { 1845 if (cp->tag_at(i).is_unresolved_klass()) { 1846 // This will force loading of the class 1847 Klass* klass = cp->klass_at(i, CHECK); 1848 if (klass->oop_is_instance()) { 1849 // Force initialization of class 1850 InstanceKlass::cast(klass)->initialize(CHECK); 1851 } 1852 } 1853 } 1854 } 1855 1856 #endif 1857 1858 1859 // Printing 1860 1861 void ConstantPool::print_on(outputStream* st) const { 1862 assert(is_constantPool(), "must be constantPool"); 1863 st->print_cr("%s", internal_name()); 1864 if (flags() != 0) { 1865 st->print(" - flags: 0x%x", flags()); 1866 if (has_preresolution()) st->print(" has_preresolution"); 1867 if (on_stack()) st->print(" on_stack"); 1868 st->cr(); 1869 } 1870 if (pool_holder() != NULL) { 1871 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder()); 1872 } 1873 st->print_cr(" - cache: " INTPTR_FORMAT, cache()); 1874 st->print_cr(" - resolved_references: " INTPTR_FORMAT, (void *)resolved_references()); 1875 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map()); 1876 1877 for (int index = 1; index < length(); index++) { // Index 0 is unused 1878 ((ConstantPool*)this)->print_entry_on(index, st); 1879 switch (tag_at(index).value()) { 1880 case JVM_CONSTANT_Long : 1881 case JVM_CONSTANT_Double : 1882 index++; // Skip entry following eigth-byte constant 1883 } 1884 1885 } 1886 st->cr(); 1887 } 1888 1889 // Print one constant pool entry 1890 void ConstantPool::print_entry_on(const int index, outputStream* st) { 1891 EXCEPTION_MARK; 1892 st->print(" - %3d : ", index); 1893 tag_at(index).print_on(st); 1894 st->print(" : "); 1895 switch (tag_at(index).value()) { 1896 case JVM_CONSTANT_Class : 1897 { Klass* k = klass_at(index, CATCH); 1898 guarantee(k != NULL, "need klass"); 1899 k->print_value_on(st); 1900 st->print(" {0x%lx}", (address)k); 1901 } 1902 break; 1903 case JVM_CONSTANT_Fieldref : 1904 case JVM_CONSTANT_Methodref : 1905 case JVM_CONSTANT_InterfaceMethodref : 1906 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); 1907 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); 1908 break; 1909 case JVM_CONSTANT_String : 1910 if (is_pseudo_string_at(index)) { 1911 oop anObj = pseudo_string_at(index); 1912 anObj->print_value_on(st); 1913 st->print(" {0x%lx}", (address)anObj); 1914 } else { 1915 unresolved_string_at(index)->print_value_on(st); 1916 } 1917 break; 1918 case JVM_CONSTANT_Integer : 1919 st->print("%d", int_at(index)); 1920 break; 1921 case JVM_CONSTANT_Float : 1922 st->print("%f", float_at(index)); 1923 break; 1924 case JVM_CONSTANT_Long : 1925 st->print_jlong(long_at(index)); 1926 break; 1927 case JVM_CONSTANT_Double : 1928 st->print("%lf", double_at(index)); 1929 break; 1930 case JVM_CONSTANT_NameAndType : 1931 st->print("name_index=%d", name_ref_index_at(index)); 1932 st->print(" signature_index=%d", signature_ref_index_at(index)); 1933 break; 1934 case JVM_CONSTANT_Utf8 : 1935 symbol_at(index)->print_value_on(st); 1936 break; 1937 case JVM_CONSTANT_UnresolvedClass : // fall-through 1938 case JVM_CONSTANT_UnresolvedClassInError: { 1939 CPSlot entry = slot_at(index); 1940 if (entry.is_resolved()) { 1941 entry.get_klass()->print_value_on(st); 1942 } else { 1943 entry.get_symbol()->print_value_on(st); 1944 } 1945 } 1946 break; 1947 case JVM_CONSTANT_MethodHandle : 1948 case JVM_CONSTANT_MethodHandleInError : 1949 st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index)); 1950 st->print(" ref_index=%d", method_handle_index_at_error_ok(index)); 1951 break; 1952 case JVM_CONSTANT_MethodType : 1953 case JVM_CONSTANT_MethodTypeInError : 1954 st->print("signature_index=%d", method_type_index_at_error_ok(index)); 1955 break; 1956 case JVM_CONSTANT_InvokeDynamic : 1957 { 1958 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); 1959 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); 1960 int argc = invoke_dynamic_argument_count_at(index); 1961 if (argc > 0) { 1962 for (int arg_i = 0; arg_i < argc; arg_i++) { 1963 int arg = invoke_dynamic_argument_index_at(index, arg_i); 1964 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 1965 } 1966 st->print("}"); 1967 } 1968 } 1969 break; 1970 default: 1971 ShouldNotReachHere(); 1972 break; 1973 } 1974 st->cr(); 1975 } 1976 1977 void ConstantPool::print_value_on(outputStream* st) const { 1978 assert(is_constantPool(), "must be constantPool"); 1979 st->print("constant pool [%d]", length()); 1980 if (has_preresolution()) st->print("/preresolution"); 1981 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); 1982 print_address_on(st); 1983 st->print(" for "); 1984 pool_holder()->print_value_on(st); 1985 if (pool_holder() != NULL) { 1986 bool extra = (pool_holder()->constants() != this); 1987 if (extra) st->print(" (extra)"); 1988 } 1989 if (cache() != NULL) { 1990 st->print(" cache=" PTR_FORMAT, cache()); 1991 } 1992 } 1993 1994 #if INCLUDE_SERVICES 1995 // Size Statistics 1996 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { 1997 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); 1998 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); 1999 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); 2000 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); 2001 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); 2002 2003 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + 2004 sz->_cp_refmap_bytes; 2005 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; 2006 } 2007 #endif // INCLUDE_SERVICES 2008 2009 // Verification 2010 2011 void ConstantPool::verify_on(outputStream* st) { 2012 guarantee(is_constantPool(), "object must be constant pool"); 2013 for (int i = 0; i< length(); i++) { 2014 constantTag tag = tag_at(i); 2015 CPSlot entry = slot_at(i); 2016 if (tag.is_klass()) { 2017 if (entry.is_resolved()) { 2018 guarantee(entry.get_klass()->is_klass(), "should be klass"); 2019 } 2020 } else if (tag.is_unresolved_klass()) { 2021 if (entry.is_resolved()) { 2022 guarantee(entry.get_klass()->is_klass(), "should be klass"); 2023 } 2024 } else if (tag.is_symbol()) { 2025 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2026 } else if (tag.is_string()) { 2027 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2028 } 2029 } 2030 if (cache() != NULL) { 2031 // Note: cache() can be NULL before a class is completely setup or 2032 // in temporary constant pools used during constant pool merging 2033 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); 2034 } 2035 if (pool_holder() != NULL) { 2036 // Note: pool_holder() can be NULL in temporary constant pools 2037 // used during constant pool merging 2038 guarantee(pool_holder()->is_klass(), "should be klass"); 2039 } 2040 } 2041 2042 2043 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { 2044 char *str = sym->as_utf8(); 2045 unsigned int hash = compute_hash(str, sym->utf8_length()); 2046 unsigned int index = hash % table_size(); 2047 2048 // check if already in map 2049 // we prefer the first entry since it is more likely to be what was used in 2050 // the class file 2051 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2052 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2053 if (en->hash() == hash && en->symbol() == sym) { 2054 return; // already there 2055 } 2056 } 2057 2058 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); 2059 entry->set_next(bucket(index)); 2060 _buckets[index].set_entry(entry); 2061 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2062 } 2063 2064 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { 2065 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); 2066 char *str = sym->as_utf8(); 2067 int len = sym->utf8_length(); 2068 unsigned int hash = SymbolHashMap::compute_hash(str, len); 2069 unsigned int index = hash % table_size(); 2070 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2071 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2072 if (en->hash() == hash && en->symbol() == sym) { 2073 return en; 2074 } 2075 } 2076 return NULL; 2077 }