1 /* 2 * Copyright (c) 1997, 2013, 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.hpp" 28 #include "classfile/metadataOnStackMark.hpp" 29 #include "classfile/symbolTable.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 "runtime/fieldType.hpp" 40 #include "runtime/init.hpp" 41 #include "runtime/javaCalls.hpp" 42 #include "runtime/signature.hpp" 43 #include "runtime/synchronizer.hpp" 44 #include "runtime/vframe.hpp" 45 46 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { 47 // Tags are RW but comment below applies to tags also. 48 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); 49 50 int size = ConstantPool::size(length); 51 52 // CDS considerations: 53 // Allocate read-write but may be able to move to read-only at dumping time 54 // if all the klasses are resolved. The only other field that is writable is 55 // the resolved_references array, which is recreated at startup time. 56 // But that could be moved to InstanceKlass (although a pain to access from 57 // assembly code). Maybe it could be moved to the cpCache which is RW. 58 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); 59 } 60 61 ConstantPool::ConstantPool(Array<u1>* tags) { 62 set_length(tags->length()); 63 set_tags(NULL); 64 set_cache(NULL); 65 set_reference_map(NULL); 66 set_resolved_references(NULL); 67 set_operands(NULL); 68 set_pool_holder(NULL); 69 set_flags(0); 70 71 // only set to non-zero if constant pool is merged by RedefineClasses 72 set_version(0); 73 74 // initialize tag array 75 int length = tags->length(); 76 for (int index = 0; index < length; index++) { 77 tags->at_put(index, JVM_CONSTANT_Invalid); 78 } 79 set_tags(tags); 80 } 81 82 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { 83 MetadataFactory::free_metadata(loader_data, cache()); 84 set_cache(NULL); 85 MetadataFactory::free_array<jushort>(loader_data, operands()); 86 set_operands(NULL); 87 88 release_C_heap_structures(); 89 90 // free tag array 91 MetadataFactory::free_array<u1>(loader_data, tags()); 92 set_tags(NULL); 93 } 94 95 void ConstantPool::release_C_heap_structures() { 96 // walk constant pool and decrement symbol reference counts 97 unreference_symbols(); 98 } 99 100 objArrayOop ConstantPool::resolved_references() const { 101 return (objArrayOop)JNIHandles::resolve(_resolved_references); 102 } 103 104 // Create resolved_references array and mapping array for original cp indexes 105 // The ldc bytecode was rewritten to have the resolved reference array index so need a way 106 // to map it back for resolving and some unlikely miscellaneous uses. 107 // The objects created by invokedynamic are appended to this list. 108 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, 109 intStack reference_map, 110 int constant_pool_map_length, 111 TRAPS) { 112 // Initialized the resolved object cache. 113 int map_length = reference_map.length(); 114 if (map_length > 0) { 115 // Only need mapping back to constant pool entries. The map isn't used for 116 // invokedynamic resolved_reference entries. The constant pool cache index 117 // has the mapping back to both the constant pool and to the resolved 118 // reference index. 119 if (constant_pool_map_length > 0) { 120 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, map_length, CHECK); 121 122 for (int i = 0; i < constant_pool_map_length; i++) { 123 int x = reference_map.at(i); 124 assert(x == (int)(jushort) x, "klass index is too big"); 125 om->at_put(i, (jushort)x); 126 } 127 set_reference_map(om); 128 } 129 130 // Create Java array for holding resolved strings, methodHandles, 131 // methodTypes, invokedynamic and invokehandle appendix objects, etc. 132 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 133 Handle refs_handle (THREAD, (oop)stom); // must handleize. 134 set_resolved_references(loader_data->add_handle(refs_handle)); 135 } 136 } 137 138 // CDS support. Create a new resolved_references array. 139 void ConstantPool::restore_unshareable_info(TRAPS) { 140 141 // restore the C++ vtable from the shared archive 142 restore_vtable(); 143 144 if (SystemDictionary::Object_klass_loaded()) { 145 // Recreate the object array and add to ClassLoaderData. 146 int map_length = resolved_reference_length(); 147 if (map_length > 0) { 148 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 149 Handle refs_handle (THREAD, (oop)stom); // must handleize. 150 151 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 152 set_resolved_references(loader_data->add_handle(refs_handle)); 153 } 154 } 155 } 156 157 void ConstantPool::remove_unshareable_info() { 158 // Resolved references are not in the shared archive. 159 // Save the length for restoration. It is not necessarily the same length 160 // as reference_map.length() if invokedynamic is saved. 161 set_resolved_reference_length( 162 resolved_references() != NULL ? resolved_references()->length() : 0); 163 set_resolved_references(NULL); 164 } 165 166 oop ConstantPool::lock() { 167 if (_pool_holder) { 168 // We re-use the _pool_holder's init_lock to reduce footprint. 169 // Notes on deadlocks: 170 // [1] This lock is a Java oop, so it can be recursively locked by 171 // the same thread without self-deadlocks. 172 // [2] Deadlock will happen if there is circular dependency between 173 // the <clinit> of two Java classes. However, in this case, 174 // the deadlock would have happened long before we reach 175 // ConstantPool::lock(), so reusing init_lock does not 176 // increase the possibility of deadlock. 177 return _pool_holder->init_lock(); 178 } else { 179 return NULL; 180 } 181 } 182 183 int ConstantPool::cp_to_object_index(int cp_index) { 184 // this is harder don't do this so much. 185 for (int i = 0; i< reference_map()->length(); i++) { 186 if (reference_map()->at(i) == cp_index) return i; 187 // Zero entry is divider between constant pool indices for strings, 188 // method handles and method types. After that the index is a constant 189 // pool cache index for invokedynamic. Stop when zero (which can never 190 // be a constant pool index) 191 if (reference_map()->at(i) == 0) break; 192 } 193 // We might not find the index. 194 return _no_index_sentinel; 195 } 196 197 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) { 198 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 199 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and 200 // tag is not updated atomicly. 201 202 CPSlot entry = this_oop->slot_at(which); 203 if (entry.is_resolved()) { 204 assert(entry.get_klass()->is_klass(), "must be"); 205 // Already resolved - return entry. 206 return entry.get_klass(); 207 } 208 209 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object 210 // already has updated the object 211 assert(THREAD->is_Java_thread(), "must be a Java thread"); 212 bool do_resolve = false; 213 bool in_error = false; 214 215 // Create a handle for the mirror. This will preserve the resolved class 216 // until the loader_data is registered. 217 Handle mirror_handle; 218 219 Symbol* name = NULL; 220 Handle loader; 221 { 222 oop cplock = this_oop->lock(); 223 ObjectLocker ol(cplock , THREAD, cplock != NULL); 224 225 if (this_oop->tag_at(which).is_unresolved_klass()) { 226 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) { 227 in_error = true; 228 } else { 229 do_resolve = true; 230 name = this_oop->unresolved_klass_at(which); 231 loader = Handle(THREAD, this_oop->pool_holder()->class_loader()); 232 } 233 } 234 } // unlocking constantPool 235 236 237 // The original attempt to resolve this constant pool entry failed so find the 238 // original error and throw it again (JVMS 5.4.3). 239 if (in_error) { 240 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which); 241 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); 242 ResourceMark rm; 243 // exception text will be the class name 244 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); 245 THROW_MSG_0(error, className); 246 } 247 248 if (do_resolve) { 249 // this_oop must be unlocked during resolve_or_fail 250 oop protection_domain = this_oop->pool_holder()->protection_domain(); 251 Handle h_prot (THREAD, protection_domain); 252 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD); 253 KlassHandle k; 254 if (!HAS_PENDING_EXCEPTION) { 255 k = KlassHandle(THREAD, k_oop); 256 // preserve the resolved klass. 257 mirror_handle = Handle(THREAD, k_oop->java_mirror()); 258 // Do access check for klasses 259 verify_constant_pool_resolve(this_oop, k, THREAD); 260 } 261 262 // Failed to resolve class. We must record the errors so that subsequent attempts 263 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). 264 if (HAS_PENDING_EXCEPTION) { 265 ResourceMark rm; 266 Symbol* error = PENDING_EXCEPTION->klass()->name(); 267 268 bool throw_orig_error = false; 269 { 270 oop cplock = this_oop->lock(); 271 ObjectLocker ol(cplock, THREAD, cplock != NULL); 272 273 // some other thread has beaten us and has resolved the class. 274 if (this_oop->tag_at(which).is_klass()) { 275 CLEAR_PENDING_EXCEPTION; 276 entry = this_oop->resolved_klass_at(which); 277 return entry.get_klass(); 278 } 279 280 if (!PENDING_EXCEPTION-> 281 is_a(SystemDictionary::LinkageError_klass())) { 282 // Just throw the exception and don't prevent these classes from 283 // being loaded due to virtual machine errors like StackOverflow 284 // and OutOfMemoryError, etc, or if the thread was hit by stop() 285 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 286 } 287 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) { 288 SystemDictionary::add_resolution_error(this_oop, which, error); 289 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError); 290 } else { 291 // some other thread has put the class in error state. 292 error = SystemDictionary::find_resolution_error(this_oop, which); 293 assert(error != NULL, "checking"); 294 throw_orig_error = true; 295 } 296 } // unlocked 297 298 if (throw_orig_error) { 299 CLEAR_PENDING_EXCEPTION; 300 ResourceMark rm; 301 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); 302 THROW_MSG_0(error, className); 303 } 304 305 return 0; 306 } 307 308 if (TraceClassResolution && !k()->oop_is_array()) { 309 // skip resolving the constant pool so that this code get's 310 // called the next time some bytecodes refer to this class. 311 ResourceMark rm; 312 int line_number = -1; 313 const char * source_file = NULL; 314 if (JavaThread::current()->has_last_Java_frame()) { 315 // try to identify the method which called this function. 316 vframeStream vfst(JavaThread::current()); 317 if (!vfst.at_end()) { 318 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 319 Symbol* s = vfst.method()->method_holder()->source_file_name(); 320 if (s != NULL) { 321 source_file = s->as_C_string(); 322 } 323 } 324 } 325 if (k() != this_oop->pool_holder()) { 326 // only print something if the classes are different 327 if (source_file != NULL) { 328 tty->print("RESOLVE %s %s %s:%d\n", 329 this_oop->pool_holder()->external_name(), 330 InstanceKlass::cast(k())->external_name(), source_file, line_number); 331 } else { 332 tty->print("RESOLVE %s %s\n", 333 this_oop->pool_holder()->external_name(), 334 InstanceKlass::cast(k())->external_name()); 335 } 336 } 337 return k(); 338 } else { 339 oop cplock = this_oop->lock(); 340 ObjectLocker ol(cplock, THREAD, cplock != NULL); 341 // Only updated constant pool - if it is resolved. 342 do_resolve = this_oop->tag_at(which).is_unresolved_klass(); 343 if (do_resolve) { 344 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data(); 345 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM 346 this_oop->klass_at_put(which, k()); 347 } 348 } 349 } 350 351 entry = this_oop->resolved_klass_at(which); 352 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); 353 return entry.get_klass(); 354 } 355 356 357 // Does not update ConstantPool* - to avoid any exception throwing. Used 358 // by compiler and exception handling. Also used to avoid classloads for 359 // instanceof operations. Returns NULL if the class has not been loaded or 360 // if the verification of constant pool failed 361 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) { 362 CPSlot entry = this_oop->slot_at(which); 363 if (entry.is_resolved()) { 364 assert(entry.get_klass()->is_klass(), "must be"); 365 return entry.get_klass(); 366 } else { 367 assert(entry.is_unresolved(), "must be either symbol or klass"); 368 Thread *thread = Thread::current(); 369 Symbol* name = entry.get_symbol(); 370 oop loader = this_oop->pool_holder()->class_loader(); 371 oop protection_domain = this_oop->pool_holder()->protection_domain(); 372 Handle h_prot (thread, protection_domain); 373 Handle h_loader (thread, loader); 374 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); 375 376 if (k != NULL) { 377 // Make sure that resolving is legal 378 EXCEPTION_MARK; 379 KlassHandle klass(THREAD, k); 380 // return NULL if verification fails 381 verify_constant_pool_resolve(this_oop, klass, THREAD); 382 if (HAS_PENDING_EXCEPTION) { 383 CLEAR_PENDING_EXCEPTION; 384 return NULL; 385 } 386 return klass(); 387 } else { 388 return k; 389 } 390 } 391 } 392 393 394 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) { 395 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which)); 396 } 397 398 399 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool, 400 int which) { 401 if (cpool->cache() == NULL) return NULL; // nothing to load yet 402 int cache_index = decode_cpcache_index(which, true); 403 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { 404 // FIXME: should be an assert 405 if (PrintMiscellaneous && (Verbose||WizardMode)) { 406 tty->print_cr("bad operand %d in:", which); cpool->print(); 407 } 408 return NULL; 409 } 410 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 411 return e->method_if_resolved(cpool); 412 } 413 414 415 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) { 416 if (cpool->cache() == NULL) return false; // nothing to load yet 417 int cache_index = decode_cpcache_index(which, true); 418 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 419 return e->has_appendix(); 420 } 421 422 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) { 423 if (cpool->cache() == NULL) return NULL; // nothing to load yet 424 int cache_index = decode_cpcache_index(which, true); 425 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 426 return e->appendix_if_resolved(cpool); 427 } 428 429 430 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) { 431 if (cpool->cache() == NULL) return false; // nothing to load yet 432 int cache_index = decode_cpcache_index(which, true); 433 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 434 return e->has_method_type(); 435 } 436 437 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) { 438 if (cpool->cache() == NULL) return NULL; // nothing to load yet 439 int cache_index = decode_cpcache_index(which, true); 440 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 441 return e->method_type_if_resolved(cpool); 442 } 443 444 445 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { 446 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 447 return symbol_at(name_index); 448 } 449 450 451 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { 452 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 453 return symbol_at(signature_index); 454 } 455 456 457 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { 458 int i = which; 459 if (!uncached && cache() != NULL) { 460 if (ConstantPool::is_invokedynamic_index(which)) { 461 // Invokedynamic index is index into resolved_references 462 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); 463 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); 464 assert(tag_at(pool_index).is_name_and_type(), ""); 465 return pool_index; 466 } 467 // change byte-ordering and go via cache 468 i = remap_instruction_operand_from_cache(which); 469 } else { 470 if (tag_at(which).is_invoke_dynamic()) { 471 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); 472 assert(tag_at(pool_index).is_name_and_type(), ""); 473 return pool_index; 474 } 475 } 476 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 477 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); 478 jint ref_index = *int_at_addr(i); 479 return extract_high_short_from_int(ref_index); 480 } 481 482 483 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { 484 guarantee(!ConstantPool::is_invokedynamic_index(which), 485 "an invokedynamic instruction does not have a klass"); 486 int i = which; 487 if (!uncached && cache() != NULL) { 488 // change byte-ordering and go via cache 489 i = remap_instruction_operand_from_cache(which); 490 } 491 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 492 jint ref_index = *int_at_addr(i); 493 return extract_low_short_from_int(ref_index); 494 } 495 496 497 498 int ConstantPool::remap_instruction_operand_from_cache(int operand) { 499 int cpc_index = operand; 500 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); 501 assert((int)(u2)cpc_index == cpc_index, "clean u2"); 502 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); 503 return member_index; 504 } 505 506 507 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) { 508 if (k->oop_is_instance() || k->oop_is_objArray()) { 509 instanceKlassHandle holder (THREAD, this_oop->pool_holder()); 510 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); 511 KlassHandle element (THREAD, elem_oop); 512 513 // The element type could be a typeArray - we only need the access check if it is 514 // an reference to another class 515 if (element->oop_is_instance()) { 516 LinkResolver::check_klass_accessability(holder, element, CHECK); 517 } 518 } 519 } 520 521 522 int ConstantPool::name_ref_index_at(int which_nt) { 523 jint ref_index = name_and_type_at(which_nt); 524 return extract_low_short_from_int(ref_index); 525 } 526 527 528 int ConstantPool::signature_ref_index_at(int which_nt) { 529 jint ref_index = name_and_type_at(which_nt); 530 return extract_high_short_from_int(ref_index); 531 } 532 533 534 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { 535 return klass_at(klass_ref_index_at(which), CHECK_NULL); 536 } 537 538 539 Symbol* ConstantPool::klass_name_at(int which) { 540 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), 541 "Corrupted constant pool"); 542 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 543 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and 544 // tag is not updated atomicly. 545 CPSlot entry = slot_at(which); 546 if (entry.is_resolved()) { 547 // Already resolved - return entry's name. 548 assert(entry.get_klass()->is_klass(), "must be"); 549 return entry.get_klass()->name(); 550 } else { 551 assert(entry.is_unresolved(), "must be either symbol or klass"); 552 return entry.get_symbol(); 553 } 554 } 555 556 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { 557 jint ref_index = klass_ref_index_at(which); 558 return klass_at_noresolve(ref_index); 559 } 560 561 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { 562 jint ref_index = uncached_klass_ref_index_at(which); 563 return klass_at_noresolve(ref_index); 564 } 565 566 char* ConstantPool::string_at_noresolve(int which) { 567 Symbol* s = unresolved_string_at(which); 568 if (s == NULL) { 569 return (char*)"<pseudo-string>"; 570 } else { 571 return unresolved_string_at(which)->as_C_string(); 572 } 573 } 574 575 BasicType ConstantPool::basic_type_for_signature_at(int which) { 576 return FieldType::basic_type(symbol_at(which)); 577 } 578 579 580 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) { 581 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused 582 if (this_oop->tag_at(index).is_string()) { 583 this_oop->string_at(index, CHECK); 584 } 585 } 586 } 587 588 // Resolve all the classes in the constant pool. If they are all resolved, 589 // the constant pool is read-only. Enhancement: allocate cp entries to 590 // another metaspace, and copy to read-only or read-write space if this 591 // bit is set. 592 bool ConstantPool::resolve_class_constants(TRAPS) { 593 constantPoolHandle cp(THREAD, this); 594 for (int index = 1; index < length(); index++) { // Index 0 is unused 595 if (tag_at(index).is_unresolved_klass() && 596 klass_at_if_loaded(cp, index) == NULL) { 597 return false; 598 } 599 } 600 // set_preresolution(); or some bit for future use 601 return true; 602 } 603 604 // If resolution for MethodHandle or MethodType fails, save the exception 605 // in the resolution error table, so that the same exception is thrown again. 606 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which, 607 int tag, TRAPS) { 608 ResourceMark rm; 609 Symbol* error = PENDING_EXCEPTION->klass()->name(); 610 oop cplock = this_oop->lock(); 611 ObjectLocker ol(cplock, THREAD, cplock != NULL); // lock cpool to change tag. 612 613 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ? 614 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError; 615 616 if (!PENDING_EXCEPTION-> 617 is_a(SystemDictionary::LinkageError_klass())) { 618 // Just throw the exception and don't prevent these classes from 619 // being loaded due to virtual machine errors like StackOverflow 620 // and OutOfMemoryError, etc, or if the thread was hit by stop() 621 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 622 623 } else if (this_oop->tag_at(which).value() != error_tag) { 624 SystemDictionary::add_resolution_error(this_oop, which, error); 625 this_oop->tag_at_put(which, error_tag); 626 } else { 627 // some other thread has put the class in error state. 628 error = SystemDictionary::find_resolution_error(this_oop, which); 629 assert(error != NULL, "checking"); 630 CLEAR_PENDING_EXCEPTION; 631 THROW_MSG(error, ""); 632 } 633 } 634 635 636 // Called to resolve constants in the constant pool and return an oop. 637 // Some constant pool entries cache their resolved oop. This is also 638 // called to create oops from constants to use in arguments for invokedynamic 639 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) { 640 oop result_oop = NULL; 641 Handle throw_exception; 642 643 if (cache_index == _possible_index_sentinel) { 644 // It is possible that this constant is one which is cached in the objects. 645 // We'll do a linear search. This should be OK because this usage is rare. 646 assert(index > 0, "valid index"); 647 cache_index = this_oop->cp_to_object_index(index); 648 } 649 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); 650 assert(index == _no_index_sentinel || index >= 0, ""); 651 652 if (cache_index >= 0) { 653 result_oop = this_oop->resolved_references()->obj_at(cache_index); 654 if (result_oop != NULL) { 655 return result_oop; 656 // That was easy... 657 } 658 index = this_oop->object_to_cp_index(cache_index); 659 } 660 661 jvalue prim_value; // temp used only in a few cases below 662 663 int tag_value = this_oop->tag_at(index).value(); 664 665 switch (tag_value) { 666 667 case JVM_CONSTANT_UnresolvedClass: 668 case JVM_CONSTANT_UnresolvedClassInError: 669 case JVM_CONSTANT_Class: 670 { 671 assert(cache_index == _no_index_sentinel, "should not have been set"); 672 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL); 673 // ldc wants the java mirror. 674 result_oop = resolved->java_mirror(); 675 break; 676 } 677 678 case JVM_CONSTANT_String: 679 assert(cache_index != _no_index_sentinel, "should have been set"); 680 if (this_oop->is_pseudo_string_at(index)) { 681 result_oop = this_oop->pseudo_string_at(index, cache_index); 682 break; 683 } 684 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL); 685 break; 686 687 case JVM_CONSTANT_MethodHandleInError: 688 case JVM_CONSTANT_MethodTypeInError: 689 { 690 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index); 691 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); 692 ResourceMark rm; 693 THROW_MSG_0(error, ""); 694 break; 695 } 696 697 case JVM_CONSTANT_MethodHandle: 698 { 699 int ref_kind = this_oop->method_handle_ref_kind_at(index); 700 int callee_index = this_oop->method_handle_klass_index_at(index); 701 Symbol* name = this_oop->method_handle_name_ref_at(index); 702 Symbol* signature = this_oop->method_handle_signature_ref_at(index); 703 if (PrintMiscellaneous) 704 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", 705 ref_kind, index, this_oop->method_handle_index_at(index), 706 callee_index, name->as_C_string(), signature->as_C_string()); 707 KlassHandle callee; 708 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL); 709 callee = KlassHandle(THREAD, k); 710 } 711 KlassHandle klass(THREAD, this_oop->pool_holder()); 712 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, 713 callee, name, signature, 714 THREAD); 715 result_oop = value(); 716 if (HAS_PENDING_EXCEPTION) { 717 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); 718 } 719 break; 720 } 721 722 case JVM_CONSTANT_MethodType: 723 { 724 Symbol* signature = this_oop->method_type_signature_at(index); 725 if (PrintMiscellaneous) 726 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", 727 index, this_oop->method_type_index_at(index), 728 signature->as_C_string()); 729 KlassHandle klass(THREAD, this_oop->pool_holder()); 730 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); 731 result_oop = value(); 732 if (HAS_PENDING_EXCEPTION) { 733 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); 734 } 735 break; 736 } 737 738 case JVM_CONSTANT_Integer: 739 assert(cache_index == _no_index_sentinel, "should not have been set"); 740 prim_value.i = this_oop->int_at(index); 741 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); 742 break; 743 744 case JVM_CONSTANT_Float: 745 assert(cache_index == _no_index_sentinel, "should not have been set"); 746 prim_value.f = this_oop->float_at(index); 747 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); 748 break; 749 750 case JVM_CONSTANT_Long: 751 assert(cache_index == _no_index_sentinel, "should not have been set"); 752 prim_value.j = this_oop->long_at(index); 753 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); 754 break; 755 756 case JVM_CONSTANT_Double: 757 assert(cache_index == _no_index_sentinel, "should not have been set"); 758 prim_value.d = this_oop->double_at(index); 759 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); 760 break; 761 762 default: 763 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", 764 this_oop(), index, cache_index, tag_value) ); 765 assert(false, "unexpected constant tag"); 766 break; 767 } 768 769 if (cache_index >= 0) { 770 // Cache the oop here also. 771 Handle result_handle(THREAD, result_oop); 772 oop cplock = this_oop->lock(); 773 ObjectLocker ol(cplock, THREAD, cplock != NULL); // don't know if we really need this 774 oop result = this_oop->resolved_references()->obj_at(cache_index); 775 // Benign race condition: resolved_references may already be filled in while we were trying to lock. 776 // The important thing here is that all threads pick up the same result. 777 // It doesn't matter which racing thread wins, as long as only one 778 // result is used by all threads, and all future queries. 779 // That result may be either a resolved constant or a failure exception. 780 if (result == NULL) { 781 this_oop->resolved_references()->obj_at_put(cache_index, result_handle()); 782 return result_handle(); 783 } else { 784 // Return the winning thread's result. This can be different than 785 // result_handle() for MethodHandles. 786 return result; 787 } 788 } else { 789 return result_oop; 790 } 791 } 792 793 oop ConstantPool::uncached_string_at(int which, TRAPS) { 794 Symbol* sym = unresolved_string_at(which); 795 oop str = StringTable::intern(sym, CHECK_(NULL)); 796 assert(java_lang_String::is_instance(str), "must be string"); 797 return str; 798 } 799 800 801 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) { 802 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); 803 804 Handle bsm; 805 int argc; 806 { 807 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments 808 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. 809 // It is accompanied by the optional arguments. 810 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index); 811 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); 812 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { 813 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); 814 } 815 816 // Extract the optional static arguments. 817 argc = this_oop->invoke_dynamic_argument_count_at(index); 818 if (argc == 0) return bsm_oop; 819 820 bsm = Handle(THREAD, bsm_oop); 821 } 822 823 objArrayHandle info; 824 { 825 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); 826 info = objArrayHandle(THREAD, info_oop); 827 } 828 829 info->obj_at_put(0, bsm()); 830 for (int i = 0; i < argc; i++) { 831 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i); 832 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); 833 info->obj_at_put(1+i, arg_oop); 834 } 835 836 return info(); 837 } 838 839 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) { 840 // If the string has already been interned, this entry will be non-null 841 oop str = this_oop->resolved_references()->obj_at(obj_index); 842 if (str != NULL) return str; 843 844 Symbol* sym = this_oop->unresolved_string_at(which); 845 str = StringTable::intern(sym, CHECK_(NULL)); 846 this_oop->string_at_put(which, obj_index, str); 847 assert(java_lang_String::is_instance(str), "must be string"); 848 return str; 849 } 850 851 852 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, 853 int which) { 854 // Names are interned, so we can compare Symbol*s directly 855 Symbol* cp_name = klass_name_at(which); 856 return (cp_name == k->name()); 857 } 858 859 860 // Iterate over symbols and decrement ones which are Symbol*s. 861 // This is done during GC so do not need to lock constantPool unless we 862 // have per-thread safepoints. 863 // Only decrement the UTF8 symbols. Unresolved classes and strings point to 864 // these symbols but didn't increment the reference count. 865 void ConstantPool::unreference_symbols() { 866 for (int index = 1; index < length(); index++) { // Index 0 is unused 867 constantTag tag = tag_at(index); 868 if (tag.is_symbol()) { 869 symbol_at(index)->decrement_refcount(); 870 } 871 } 872 } 873 874 875 // Compare this constant pool's entry at index1 to the constant pool 876 // cp2's entry at index2. 877 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2, 878 int index2, TRAPS) { 879 880 jbyte t1 = tag_at(index1).value(); 881 jbyte t2 = cp2->tag_at(index2).value(); 882 883 884 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass 885 // when comparing 886 if (t1 == JVM_CONSTANT_UnresolvedClassInError) { 887 t1 = JVM_CONSTANT_UnresolvedClass; 888 } 889 if (t2 == JVM_CONSTANT_UnresolvedClassInError) { 890 t2 = JVM_CONSTANT_UnresolvedClass; 891 } 892 893 if (t1 != t2) { 894 // Not the same entry type so there is nothing else to check. Note 895 // that this style of checking will consider resolved/unresolved 896 // class pairs as different. 897 // From the ConstantPool* API point of view, this is correct 898 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this 899 // plays out in the context of ConstantPool* merging. 900 return false; 901 } 902 903 switch (t1) { 904 case JVM_CONSTANT_Class: 905 { 906 Klass* k1 = klass_at(index1, CHECK_false); 907 Klass* k2 = cp2->klass_at(index2, CHECK_false); 908 if (k1 == k2) { 909 return true; 910 } 911 } break; 912 913 case JVM_CONSTANT_ClassIndex: 914 { 915 int recur1 = klass_index_at(index1); 916 int recur2 = cp2->klass_index_at(index2); 917 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 918 if (match) { 919 return true; 920 } 921 } break; 922 923 case JVM_CONSTANT_Double: 924 { 925 jdouble d1 = double_at(index1); 926 jdouble d2 = cp2->double_at(index2); 927 if (d1 == d2) { 928 return true; 929 } 930 } break; 931 932 case JVM_CONSTANT_Fieldref: 933 case JVM_CONSTANT_InterfaceMethodref: 934 case JVM_CONSTANT_Methodref: 935 { 936 int recur1 = uncached_klass_ref_index_at(index1); 937 int recur2 = cp2->uncached_klass_ref_index_at(index2); 938 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 939 if (match) { 940 recur1 = uncached_name_and_type_ref_index_at(index1); 941 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); 942 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 943 if (match) { 944 return true; 945 } 946 } 947 } break; 948 949 case JVM_CONSTANT_Float: 950 { 951 jfloat f1 = float_at(index1); 952 jfloat f2 = cp2->float_at(index2); 953 if (f1 == f2) { 954 return true; 955 } 956 } break; 957 958 case JVM_CONSTANT_Integer: 959 { 960 jint i1 = int_at(index1); 961 jint i2 = cp2->int_at(index2); 962 if (i1 == i2) { 963 return true; 964 } 965 } break; 966 967 case JVM_CONSTANT_Long: 968 { 969 jlong l1 = long_at(index1); 970 jlong l2 = cp2->long_at(index2); 971 if (l1 == l2) { 972 return true; 973 } 974 } break; 975 976 case JVM_CONSTANT_NameAndType: 977 { 978 int recur1 = name_ref_index_at(index1); 979 int recur2 = cp2->name_ref_index_at(index2); 980 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 981 if (match) { 982 recur1 = signature_ref_index_at(index1); 983 recur2 = cp2->signature_ref_index_at(index2); 984 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 985 if (match) { 986 return true; 987 } 988 } 989 } break; 990 991 case JVM_CONSTANT_StringIndex: 992 { 993 int recur1 = string_index_at(index1); 994 int recur2 = cp2->string_index_at(index2); 995 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 996 if (match) { 997 return true; 998 } 999 } break; 1000 1001 case JVM_CONSTANT_UnresolvedClass: 1002 { 1003 Symbol* k1 = unresolved_klass_at(index1); 1004 Symbol* k2 = cp2->unresolved_klass_at(index2); 1005 if (k1 == k2) { 1006 return true; 1007 } 1008 } break; 1009 1010 case JVM_CONSTANT_MethodType: 1011 { 1012 int k1 = method_type_index_at(index1); 1013 int k2 = cp2->method_type_index_at(index2); 1014 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1015 if (match) { 1016 return true; 1017 } 1018 } break; 1019 1020 case JVM_CONSTANT_MethodHandle: 1021 { 1022 int k1 = method_handle_ref_kind_at(index1); 1023 int k2 = cp2->method_handle_ref_kind_at(index2); 1024 if (k1 == k2) { 1025 int i1 = method_handle_index_at(index1); 1026 int i2 = cp2->method_handle_index_at(index2); 1027 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); 1028 if (match) { 1029 return true; 1030 } 1031 } 1032 } break; 1033 1034 case JVM_CONSTANT_InvokeDynamic: 1035 { 1036 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); 1037 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); 1038 int i1 = invoke_dynamic_bootstrap_specifier_index(index1); 1039 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); 1040 // separate statements and variables because CHECK_false is used 1041 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); 1042 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); 1043 return (match_entry && match_operand); 1044 } break; 1045 1046 case JVM_CONSTANT_String: 1047 { 1048 Symbol* s1 = unresolved_string_at(index1); 1049 Symbol* s2 = cp2->unresolved_string_at(index2); 1050 if (s1 == s2) { 1051 return true; 1052 } 1053 } break; 1054 1055 case JVM_CONSTANT_Utf8: 1056 { 1057 Symbol* s1 = symbol_at(index1); 1058 Symbol* s2 = cp2->symbol_at(index2); 1059 if (s1 == s2) { 1060 return true; 1061 } 1062 } break; 1063 1064 // Invalid is used as the tag for the second constant pool entry 1065 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1066 // not be seen by itself. 1067 case JVM_CONSTANT_Invalid: // fall through 1068 1069 default: 1070 ShouldNotReachHere(); 1071 break; 1072 } 1073 1074 return false; 1075 } // end compare_entry_to() 1076 1077 1078 // Resize the operands array with delta_len and delta_size. 1079 // Used in RedefineClasses for CP merge. 1080 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { 1081 int old_len = operand_array_length(operands()); 1082 int new_len = old_len + delta_len; 1083 int min_len = (delta_len > 0) ? old_len : new_len; 1084 1085 int old_size = operands()->length(); 1086 int new_size = old_size + delta_size; 1087 int min_size = (delta_size > 0) ? old_size : new_size; 1088 1089 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1090 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); 1091 1092 // Set index in the resized array for existing elements only 1093 for (int idx = 0; idx < min_len; idx++) { 1094 int offset = operand_offset_at(idx); // offset in original array 1095 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array 1096 } 1097 // Copy the bootstrap specifiers only 1098 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), 1099 new_ops->adr_at(2*new_len), 1100 (min_size - 2*min_len) * sizeof(u2)); 1101 // Explicitly deallocate old operands array. 1102 // Note, it is not needed for 7u backport. 1103 if ( operands() != NULL) { // the safety check 1104 MetadataFactory::free_array<u2>(loader_data, operands()); 1105 } 1106 set_operands(new_ops); 1107 } // end resize_operands() 1108 1109 1110 // Extend the operands array with the length and size of the ext_cp operands. 1111 // Used in RedefineClasses for CP merge. 1112 void ConstantPool::extend_operands(constantPoolHandle ext_cp, TRAPS) { 1113 int delta_len = operand_array_length(ext_cp->operands()); 1114 if (delta_len == 0) { 1115 return; // nothing to do 1116 } 1117 int delta_size = ext_cp->operands()->length(); 1118 1119 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); 1120 1121 if (operand_array_length(operands()) == 0) { 1122 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1123 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); 1124 // The first element index defines the offset of second part 1125 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array 1126 set_operands(new_ops); 1127 } else { 1128 resize_operands(delta_len, delta_size, CHECK); 1129 } 1130 1131 } // end extend_operands() 1132 1133 1134 // Shrink the operands array to a smaller array with new_len length. 1135 // Used in RedefineClasses for CP merge. 1136 void ConstantPool::shrink_operands(int new_len, TRAPS) { 1137 int old_len = operand_array_length(operands()); 1138 if (new_len == old_len) { 1139 return; // nothing to do 1140 } 1141 assert(new_len < old_len, "shrunken operands array must be smaller"); 1142 1143 int free_base = operand_next_offset_at(new_len - 1); 1144 int delta_len = new_len - old_len; 1145 int delta_size = 2*delta_len + free_base - operands()->length(); 1146 1147 resize_operands(delta_len, delta_size, CHECK); 1148 1149 } // end shrink_operands() 1150 1151 1152 void ConstantPool::copy_operands(constantPoolHandle from_cp, 1153 constantPoolHandle to_cp, 1154 TRAPS) { 1155 1156 int from_oplen = operand_array_length(from_cp->operands()); 1157 int old_oplen = operand_array_length(to_cp->operands()); 1158 if (from_oplen != 0) { 1159 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); 1160 // append my operands to the target's operands array 1161 if (old_oplen == 0) { 1162 // Can't just reuse from_cp's operand list because of deallocation issues 1163 int len = from_cp->operands()->length(); 1164 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); 1165 Copy::conjoint_memory_atomic( 1166 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); 1167 to_cp->set_operands(new_ops); 1168 } else { 1169 int old_len = to_cp->operands()->length(); 1170 int from_len = from_cp->operands()->length(); 1171 int old_off = old_oplen * sizeof(u2); 1172 int from_off = from_oplen * sizeof(u2); 1173 // Use the metaspace for the destination constant pool 1174 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); 1175 int fillp = 0, len = 0; 1176 // first part of dest 1177 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), 1178 new_operands->adr_at(fillp), 1179 (len = old_off) * sizeof(u2)); 1180 fillp += len; 1181 // first part of src 1182 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), 1183 new_operands->adr_at(fillp), 1184 (len = from_off) * sizeof(u2)); 1185 fillp += len; 1186 // second part of dest 1187 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), 1188 new_operands->adr_at(fillp), 1189 (len = old_len - old_off) * sizeof(u2)); 1190 fillp += len; 1191 // second part of src 1192 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), 1193 new_operands->adr_at(fillp), 1194 (len = from_len - from_off) * sizeof(u2)); 1195 fillp += len; 1196 assert(fillp == new_operands->length(), ""); 1197 1198 // Adjust indexes in the first part of the copied operands array. 1199 for (int j = 0; j < from_oplen; j++) { 1200 int offset = operand_offset_at(new_operands, old_oplen + j); 1201 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); 1202 offset += old_len; // every new tuple is preceded by old_len extra u2's 1203 operand_offset_at_put(new_operands, old_oplen + j, offset); 1204 } 1205 1206 // replace target operands array with combined array 1207 to_cp->set_operands(new_operands); 1208 } 1209 } 1210 } // end copy_operands() 1211 1212 1213 // Copy this constant pool's entries at start_i to end_i (inclusive) 1214 // to the constant pool to_cp's entries starting at to_i. A total of 1215 // (end_i - start_i) + 1 entries are copied. 1216 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, 1217 constantPoolHandle to_cp, int to_i, TRAPS) { 1218 1219 1220 int dest_i = to_i; // leave original alone for debug purposes 1221 1222 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { 1223 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); 1224 1225 switch (from_cp->tag_at(src_i).value()) { 1226 case JVM_CONSTANT_Double: 1227 case JVM_CONSTANT_Long: 1228 // double and long take two constant pool entries 1229 src_i += 2; 1230 dest_i += 2; 1231 break; 1232 1233 default: 1234 // all others take one constant pool entry 1235 src_i++; 1236 dest_i++; 1237 break; 1238 } 1239 } 1240 copy_operands(from_cp, to_cp, CHECK); 1241 1242 } // end copy_cp_to_impl() 1243 1244 1245 // Copy this constant pool's entry at from_i to the constant pool 1246 // to_cp's entry at to_i. 1247 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i, 1248 constantPoolHandle to_cp, int to_i, 1249 TRAPS) { 1250 1251 int tag = from_cp->tag_at(from_i).value(); 1252 switch (tag) { 1253 case JVM_CONSTANT_Class: 1254 { 1255 Klass* k = from_cp->klass_at(from_i, CHECK); 1256 to_cp->klass_at_put(to_i, k); 1257 } break; 1258 1259 case JVM_CONSTANT_ClassIndex: 1260 { 1261 jint ki = from_cp->klass_index_at(from_i); 1262 to_cp->klass_index_at_put(to_i, ki); 1263 } break; 1264 1265 case JVM_CONSTANT_Double: 1266 { 1267 jdouble d = from_cp->double_at(from_i); 1268 to_cp->double_at_put(to_i, d); 1269 // double takes two constant pool entries so init second entry's tag 1270 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1271 } break; 1272 1273 case JVM_CONSTANT_Fieldref: 1274 { 1275 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1276 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1277 to_cp->field_at_put(to_i, class_index, name_and_type_index); 1278 } break; 1279 1280 case JVM_CONSTANT_Float: 1281 { 1282 jfloat f = from_cp->float_at(from_i); 1283 to_cp->float_at_put(to_i, f); 1284 } break; 1285 1286 case JVM_CONSTANT_Integer: 1287 { 1288 jint i = from_cp->int_at(from_i); 1289 to_cp->int_at_put(to_i, i); 1290 } break; 1291 1292 case JVM_CONSTANT_InterfaceMethodref: 1293 { 1294 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1295 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1296 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); 1297 } break; 1298 1299 case JVM_CONSTANT_Long: 1300 { 1301 jlong l = from_cp->long_at(from_i); 1302 to_cp->long_at_put(to_i, l); 1303 // long takes two constant pool entries so init second entry's tag 1304 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1305 } break; 1306 1307 case JVM_CONSTANT_Methodref: 1308 { 1309 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1310 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1311 to_cp->method_at_put(to_i, class_index, name_and_type_index); 1312 } break; 1313 1314 case JVM_CONSTANT_NameAndType: 1315 { 1316 int name_ref_index = from_cp->name_ref_index_at(from_i); 1317 int signature_ref_index = from_cp->signature_ref_index_at(from_i); 1318 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); 1319 } break; 1320 1321 case JVM_CONSTANT_StringIndex: 1322 { 1323 jint si = from_cp->string_index_at(from_i); 1324 to_cp->string_index_at_put(to_i, si); 1325 } break; 1326 1327 case JVM_CONSTANT_UnresolvedClass: 1328 { 1329 // Can be resolved after checking tag, so check the slot first. 1330 CPSlot entry = from_cp->slot_at(from_i); 1331 if (entry.is_resolved()) { 1332 assert(entry.get_klass()->is_klass(), "must be"); 1333 // Already resolved 1334 to_cp->klass_at_put(to_i, entry.get_klass()); 1335 } else { 1336 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); 1337 } 1338 } break; 1339 1340 case JVM_CONSTANT_UnresolvedClassInError: 1341 { 1342 Symbol* k = from_cp->unresolved_klass_at(from_i); 1343 to_cp->unresolved_klass_at_put(to_i, k); 1344 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError); 1345 } break; 1346 1347 1348 case JVM_CONSTANT_String: 1349 { 1350 Symbol* s = from_cp->unresolved_string_at(from_i); 1351 to_cp->unresolved_string_at_put(to_i, s); 1352 } break; 1353 1354 case JVM_CONSTANT_Utf8: 1355 { 1356 Symbol* s = from_cp->symbol_at(from_i); 1357 // Need to increase refcount, the old one will be thrown away and deferenced 1358 s->increment_refcount(); 1359 to_cp->symbol_at_put(to_i, s); 1360 } break; 1361 1362 case JVM_CONSTANT_MethodType: 1363 { 1364 jint k = from_cp->method_type_index_at(from_i); 1365 to_cp->method_type_index_at_put(to_i, k); 1366 } break; 1367 1368 case JVM_CONSTANT_MethodHandle: 1369 { 1370 int k1 = from_cp->method_handle_ref_kind_at(from_i); 1371 int k2 = from_cp->method_handle_index_at(from_i); 1372 to_cp->method_handle_index_at_put(to_i, k1, k2); 1373 } break; 1374 1375 case JVM_CONSTANT_InvokeDynamic: 1376 { 1377 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); 1378 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); 1379 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1380 to_cp->invoke_dynamic_at_put(to_i, k1, k2); 1381 } break; 1382 1383 // Invalid is used as the tag for the second constant pool entry 1384 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1385 // not be seen by itself. 1386 case JVM_CONSTANT_Invalid: // fall through 1387 1388 default: 1389 { 1390 ShouldNotReachHere(); 1391 } break; 1392 } 1393 } // end copy_entry_to() 1394 1395 1396 // Search constant pool search_cp for an entry that matches this 1397 // constant pool's entry at pattern_i. Returns the index of a 1398 // matching entry or zero (0) if there is no matching entry. 1399 int ConstantPool::find_matching_entry(int pattern_i, 1400 constantPoolHandle search_cp, TRAPS) { 1401 1402 // index zero (0) is not used 1403 for (int i = 1; i < search_cp->length(); i++) { 1404 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); 1405 if (found) { 1406 return i; 1407 } 1408 } 1409 1410 return 0; // entry not found; return unused index zero (0) 1411 } // end find_matching_entry() 1412 1413 1414 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool 1415 // cp2's bootstrap specifier at idx2. 1416 bool ConstantPool::compare_operand_to(int idx1, constantPoolHandle cp2, int idx2, TRAPS) { 1417 int k1 = operand_bootstrap_method_ref_index_at(idx1); 1418 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); 1419 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1420 1421 if (!match) { 1422 return false; 1423 } 1424 int argc = operand_argument_count_at(idx1); 1425 if (argc == cp2->operand_argument_count_at(idx2)) { 1426 for (int j = 0; j < argc; j++) { 1427 k1 = operand_argument_index_at(idx1, j); 1428 k2 = cp2->operand_argument_index_at(idx2, j); 1429 match = compare_entry_to(k1, cp2, k2, CHECK_false); 1430 if (!match) { 1431 return false; 1432 } 1433 } 1434 return true; // got through loop; all elements equal 1435 } 1436 return false; 1437 } // end compare_operand_to() 1438 1439 // Search constant pool search_cp for a bootstrap specifier that matches 1440 // this constant pool's bootstrap specifier at pattern_i index. 1441 // Return the index of a matching bootstrap specifier or (-1) if there is no match. 1442 int ConstantPool::find_matching_operand(int pattern_i, 1443 constantPoolHandle search_cp, int search_len, TRAPS) { 1444 for (int i = 0; i < search_len; i++) { 1445 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); 1446 if (found) { 1447 return i; 1448 } 1449 } 1450 return -1; // bootstrap specifier not found; return unused index (-1) 1451 } // end find_matching_operand() 1452 1453 1454 #ifndef PRODUCT 1455 1456 const char* ConstantPool::printable_name_at(int which) { 1457 1458 constantTag tag = tag_at(which); 1459 1460 if (tag.is_string()) { 1461 return string_at_noresolve(which); 1462 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 1463 return klass_name_at(which)->as_C_string(); 1464 } else if (tag.is_symbol()) { 1465 return symbol_at(which)->as_C_string(); 1466 } 1467 return ""; 1468 } 1469 1470 #endif // PRODUCT 1471 1472 1473 // JVMTI GetConstantPool support 1474 1475 // For debugging of constant pool 1476 const bool debug_cpool = false; 1477 1478 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) 1479 1480 static void print_cpool_bytes(jint cnt, u1 *bytes) { 1481 const char* WARN_MSG = "Must not be such entry!"; 1482 jint size = 0; 1483 u2 idx1, idx2; 1484 1485 for (jint idx = 1; idx < cnt; idx++) { 1486 jint ent_size = 0; 1487 u1 tag = *bytes++; 1488 size++; // count tag 1489 1490 printf("const #%03d, tag: %02d ", idx, tag); 1491 switch(tag) { 1492 case JVM_CONSTANT_Invalid: { 1493 printf("Invalid"); 1494 break; 1495 } 1496 case JVM_CONSTANT_Unicode: { 1497 printf("Unicode %s", WARN_MSG); 1498 break; 1499 } 1500 case JVM_CONSTANT_Utf8: { 1501 u2 len = Bytes::get_Java_u2(bytes); 1502 char str[128]; 1503 if (len > 127) { 1504 len = 127; 1505 } 1506 strncpy(str, (char *) (bytes+2), len); 1507 str[len] = '\0'; 1508 printf("Utf8 \"%s\"", str); 1509 ent_size = 2 + len; 1510 break; 1511 } 1512 case JVM_CONSTANT_Integer: { 1513 u4 val = Bytes::get_Java_u4(bytes); 1514 printf("int %d", *(int *) &val); 1515 ent_size = 4; 1516 break; 1517 } 1518 case JVM_CONSTANT_Float: { 1519 u4 val = Bytes::get_Java_u4(bytes); 1520 printf("float %5.3ff", *(float *) &val); 1521 ent_size = 4; 1522 break; 1523 } 1524 case JVM_CONSTANT_Long: { 1525 u8 val = Bytes::get_Java_u8(bytes); 1526 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val); 1527 ent_size = 8; 1528 idx++; // Long takes two cpool slots 1529 break; 1530 } 1531 case JVM_CONSTANT_Double: { 1532 u8 val = Bytes::get_Java_u8(bytes); 1533 printf("double %5.3fd", *(jdouble *)&val); 1534 ent_size = 8; 1535 idx++; // Double takes two cpool slots 1536 break; 1537 } 1538 case JVM_CONSTANT_Class: { 1539 idx1 = Bytes::get_Java_u2(bytes); 1540 printf("class #%03d", idx1); 1541 ent_size = 2; 1542 break; 1543 } 1544 case JVM_CONSTANT_String: { 1545 idx1 = Bytes::get_Java_u2(bytes); 1546 printf("String #%03d", idx1); 1547 ent_size = 2; 1548 break; 1549 } 1550 case JVM_CONSTANT_Fieldref: { 1551 idx1 = Bytes::get_Java_u2(bytes); 1552 idx2 = Bytes::get_Java_u2(bytes+2); 1553 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); 1554 ent_size = 4; 1555 break; 1556 } 1557 case JVM_CONSTANT_Methodref: { 1558 idx1 = Bytes::get_Java_u2(bytes); 1559 idx2 = Bytes::get_Java_u2(bytes+2); 1560 printf("Method #%03d, #%03d", idx1, idx2); 1561 ent_size = 4; 1562 break; 1563 } 1564 case JVM_CONSTANT_InterfaceMethodref: { 1565 idx1 = Bytes::get_Java_u2(bytes); 1566 idx2 = Bytes::get_Java_u2(bytes+2); 1567 printf("InterfMethod #%03d, #%03d", idx1, idx2); 1568 ent_size = 4; 1569 break; 1570 } 1571 case JVM_CONSTANT_NameAndType: { 1572 idx1 = Bytes::get_Java_u2(bytes); 1573 idx2 = Bytes::get_Java_u2(bytes+2); 1574 printf("NameAndType #%03d, #%03d", idx1, idx2); 1575 ent_size = 4; 1576 break; 1577 } 1578 case JVM_CONSTANT_ClassIndex: { 1579 printf("ClassIndex %s", WARN_MSG); 1580 break; 1581 } 1582 case JVM_CONSTANT_UnresolvedClass: { 1583 printf("UnresolvedClass: %s", WARN_MSG); 1584 break; 1585 } 1586 case JVM_CONSTANT_UnresolvedClassInError: { 1587 printf("UnresolvedClassInErr: %s", WARN_MSG); 1588 break; 1589 } 1590 case JVM_CONSTANT_StringIndex: { 1591 printf("StringIndex: %s", WARN_MSG); 1592 break; 1593 } 1594 } 1595 printf(";\n"); 1596 bytes += ent_size; 1597 size += ent_size; 1598 } 1599 printf("Cpool size: %d\n", size); 1600 fflush(0); 1601 return; 1602 } /* end print_cpool_bytes */ 1603 1604 1605 // Returns size of constant pool entry. 1606 jint ConstantPool::cpool_entry_size(jint idx) { 1607 switch(tag_at(idx).value()) { 1608 case JVM_CONSTANT_Invalid: 1609 case JVM_CONSTANT_Unicode: 1610 return 1; 1611 1612 case JVM_CONSTANT_Utf8: 1613 return 3 + symbol_at(idx)->utf8_length(); 1614 1615 case JVM_CONSTANT_Class: 1616 case JVM_CONSTANT_String: 1617 case JVM_CONSTANT_ClassIndex: 1618 case JVM_CONSTANT_UnresolvedClass: 1619 case JVM_CONSTANT_UnresolvedClassInError: 1620 case JVM_CONSTANT_StringIndex: 1621 case JVM_CONSTANT_MethodType: 1622 return 3; 1623 1624 case JVM_CONSTANT_MethodHandle: 1625 return 4; //tag, ref_kind, ref_index 1626 1627 case JVM_CONSTANT_Integer: 1628 case JVM_CONSTANT_Float: 1629 case JVM_CONSTANT_Fieldref: 1630 case JVM_CONSTANT_Methodref: 1631 case JVM_CONSTANT_InterfaceMethodref: 1632 case JVM_CONSTANT_NameAndType: 1633 return 5; 1634 1635 case JVM_CONSTANT_InvokeDynamic: 1636 // u1 tag, u2 bsm, u2 nt 1637 return 5; 1638 1639 case JVM_CONSTANT_Long: 1640 case JVM_CONSTANT_Double: 1641 return 9; 1642 } 1643 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); 1644 return 1; 1645 } /* end cpool_entry_size */ 1646 1647 1648 // SymbolHashMap is used to find a constant pool index from a string. 1649 // This function fills in SymbolHashMaps, one for utf8s and one for 1650 // class names, returns size of the cpool raw bytes. 1651 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, 1652 SymbolHashMap *classmap) { 1653 jint size = 0; 1654 1655 for (u2 idx = 1; idx < length(); idx++) { 1656 u2 tag = tag_at(idx).value(); 1657 size += cpool_entry_size(idx); 1658 1659 switch(tag) { 1660 case JVM_CONSTANT_Utf8: { 1661 Symbol* sym = symbol_at(idx); 1662 symmap->add_entry(sym, idx); 1663 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); 1664 break; 1665 } 1666 case JVM_CONSTANT_Class: 1667 case JVM_CONSTANT_UnresolvedClass: 1668 case JVM_CONSTANT_UnresolvedClassInError: { 1669 Symbol* sym = klass_name_at(idx); 1670 classmap->add_entry(sym, idx); 1671 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); 1672 break; 1673 } 1674 case JVM_CONSTANT_Long: 1675 case JVM_CONSTANT_Double: { 1676 idx++; // Both Long and Double take two cpool slots 1677 break; 1678 } 1679 } 1680 } 1681 return size; 1682 } /* end hash_utf8_entries_to */ 1683 1684 1685 // Copy cpool bytes. 1686 // Returns: 1687 // 0, in case of OutOfMemoryError 1688 // -1, in case of internal error 1689 // > 0, count of the raw cpool bytes that have been copied 1690 int ConstantPool::copy_cpool_bytes(int cpool_size, 1691 SymbolHashMap* tbl, 1692 unsigned char *bytes) { 1693 u2 idx1, idx2; 1694 jint size = 0; 1695 jint cnt = length(); 1696 unsigned char *start_bytes = bytes; 1697 1698 for (jint idx = 1; idx < cnt; idx++) { 1699 u1 tag = tag_at(idx).value(); 1700 jint ent_size = cpool_entry_size(idx); 1701 1702 assert(size + ent_size <= cpool_size, "Size mismatch"); 1703 1704 *bytes = tag; 1705 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); 1706 switch(tag) { 1707 case JVM_CONSTANT_Invalid: { 1708 DBG(printf("JVM_CONSTANT_Invalid")); 1709 break; 1710 } 1711 case JVM_CONSTANT_Unicode: { 1712 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); 1713 DBG(printf("JVM_CONSTANT_Unicode")); 1714 break; 1715 } 1716 case JVM_CONSTANT_Utf8: { 1717 Symbol* sym = symbol_at(idx); 1718 char* str = sym->as_utf8(); 1719 // Warning! It's crashing on x86 with len = sym->utf8_length() 1720 int len = (int) strlen(str); 1721 Bytes::put_Java_u2((address) (bytes+1), (u2) len); 1722 for (int i = 0; i < len; i++) { 1723 bytes[3+i] = (u1) str[i]; 1724 } 1725 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); 1726 break; 1727 } 1728 case JVM_CONSTANT_Integer: { 1729 jint val = int_at(idx); 1730 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1731 break; 1732 } 1733 case JVM_CONSTANT_Float: { 1734 jfloat val = float_at(idx); 1735 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1736 break; 1737 } 1738 case JVM_CONSTANT_Long: { 1739 jlong val = long_at(idx); 1740 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1741 idx++; // Long takes two cpool slots 1742 break; 1743 } 1744 case JVM_CONSTANT_Double: { 1745 jdouble val = double_at(idx); 1746 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1747 idx++; // Double takes two cpool slots 1748 break; 1749 } 1750 case JVM_CONSTANT_Class: 1751 case JVM_CONSTANT_UnresolvedClass: 1752 case JVM_CONSTANT_UnresolvedClassInError: { 1753 *bytes = JVM_CONSTANT_Class; 1754 Symbol* sym = klass_name_at(idx); 1755 idx1 = tbl->symbol_to_value(sym); 1756 assert(idx1 != 0, "Have not found a hashtable entry"); 1757 Bytes::put_Java_u2((address) (bytes+1), idx1); 1758 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); 1759 break; 1760 } 1761 case JVM_CONSTANT_String: { 1762 *bytes = JVM_CONSTANT_String; 1763 Symbol* sym = unresolved_string_at(idx); 1764 idx1 = tbl->symbol_to_value(sym); 1765 assert(idx1 != 0, "Have not found a hashtable entry"); 1766 Bytes::put_Java_u2((address) (bytes+1), idx1); 1767 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); 1768 break; 1769 } 1770 case JVM_CONSTANT_Fieldref: 1771 case JVM_CONSTANT_Methodref: 1772 case JVM_CONSTANT_InterfaceMethodref: { 1773 idx1 = uncached_klass_ref_index_at(idx); 1774 idx2 = uncached_name_and_type_ref_index_at(idx); 1775 Bytes::put_Java_u2((address) (bytes+1), idx1); 1776 Bytes::put_Java_u2((address) (bytes+3), idx2); 1777 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); 1778 break; 1779 } 1780 case JVM_CONSTANT_NameAndType: { 1781 idx1 = name_ref_index_at(idx); 1782 idx2 = signature_ref_index_at(idx); 1783 Bytes::put_Java_u2((address) (bytes+1), idx1); 1784 Bytes::put_Java_u2((address) (bytes+3), idx2); 1785 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); 1786 break; 1787 } 1788 case JVM_CONSTANT_ClassIndex: { 1789 *bytes = JVM_CONSTANT_Class; 1790 idx1 = klass_index_at(idx); 1791 Bytes::put_Java_u2((address) (bytes+1), idx1); 1792 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); 1793 break; 1794 } 1795 case JVM_CONSTANT_StringIndex: { 1796 *bytes = JVM_CONSTANT_String; 1797 idx1 = string_index_at(idx); 1798 Bytes::put_Java_u2((address) (bytes+1), idx1); 1799 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); 1800 break; 1801 } 1802 case JVM_CONSTANT_MethodHandle: 1803 case JVM_CONSTANT_MethodHandleInError: { 1804 *bytes = JVM_CONSTANT_MethodHandle; 1805 int kind = method_handle_ref_kind_at(idx); 1806 idx1 = method_handle_index_at(idx); 1807 *(bytes+1) = (unsigned char) kind; 1808 Bytes::put_Java_u2((address) (bytes+2), idx1); 1809 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); 1810 break; 1811 } 1812 case JVM_CONSTANT_MethodType: 1813 case JVM_CONSTANT_MethodTypeInError: { 1814 *bytes = JVM_CONSTANT_MethodType; 1815 idx1 = method_type_index_at(idx); 1816 Bytes::put_Java_u2((address) (bytes+1), idx1); 1817 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); 1818 break; 1819 } 1820 case JVM_CONSTANT_InvokeDynamic: { 1821 *bytes = tag; 1822 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 1823 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 1824 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); 1825 Bytes::put_Java_u2((address) (bytes+1), idx1); 1826 Bytes::put_Java_u2((address) (bytes+3), idx2); 1827 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); 1828 break; 1829 } 1830 } 1831 DBG(printf("\n")); 1832 bytes += ent_size; 1833 size += ent_size; 1834 } 1835 assert(size == cpool_size, "Size mismatch"); 1836 1837 // Keep temorarily for debugging until it's stable. 1838 DBG(print_cpool_bytes(cnt, start_bytes)); 1839 return (int)(bytes - start_bytes); 1840 } /* end copy_cpool_bytes */ 1841 1842 #undef DBG 1843 1844 1845 void ConstantPool::set_on_stack(const bool value) { 1846 if (value) { 1847 _flags |= _on_stack; 1848 } else { 1849 _flags &= ~_on_stack; 1850 } 1851 if (value) MetadataOnStackMark::record(this); 1852 } 1853 1854 // JSR 292 support for patching constant pool oops after the class is linked and 1855 // the oop array for resolved references are created. 1856 // We can't do this during classfile parsing, which is how the other indexes are 1857 // patched. The other patches are applied early for some error checking 1858 // so only defer the pseudo_strings. 1859 void ConstantPool::patch_resolved_references( 1860 GrowableArray<Handle>* cp_patches) { 1861 assert(EnableInvokeDynamic, ""); 1862 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused 1863 Handle patch = cp_patches->at(index); 1864 if (patch.not_null()) { 1865 assert (tag_at(index).is_string(), "should only be string left"); 1866 // Patching a string means pre-resolving it. 1867 // The spelling in the constant pool is ignored. 1868 // The constant reference may be any object whatever. 1869 // If it is not a real interned string, the constant is referred 1870 // to as a "pseudo-string", and must be presented to the CP 1871 // explicitly, because it may require scavenging. 1872 int obj_index = cp_to_object_index(index); 1873 pseudo_string_at_put(index, obj_index, patch()); 1874 DEBUG_ONLY(cp_patches->at_put(index, Handle());) 1875 } 1876 } 1877 #ifdef ASSERT 1878 // Ensure that all the patches have been used. 1879 for (int index = 0; index < cp_patches->length(); index++) { 1880 assert(cp_patches->at(index).is_null(), 1881 err_msg("Unused constant pool patch at %d in class file %s", 1882 index, 1883 pool_holder()->external_name())); 1884 } 1885 #endif // ASSERT 1886 } 1887 1888 #ifndef PRODUCT 1889 1890 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool 1891 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { 1892 guarantee(obj->is_constantPool(), "object must be constant pool"); 1893 constantPoolHandle cp(THREAD, (ConstantPool*)obj); 1894 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); 1895 1896 for (int i = 0; i< cp->length(); i++) { 1897 if (cp->tag_at(i).is_unresolved_klass()) { 1898 // This will force loading of the class 1899 Klass* klass = cp->klass_at(i, CHECK); 1900 if (klass->oop_is_instance()) { 1901 // Force initialization of class 1902 InstanceKlass::cast(klass)->initialize(CHECK); 1903 } 1904 } 1905 } 1906 } 1907 1908 #endif 1909 1910 1911 // Printing 1912 1913 void ConstantPool::print_on(outputStream* st) const { 1914 EXCEPTION_MARK; 1915 assert(is_constantPool(), "must be constantPool"); 1916 st->print_cr(internal_name()); 1917 if (flags() != 0) { 1918 st->print(" - flags: 0x%x", flags()); 1919 if (has_preresolution()) st->print(" has_preresolution"); 1920 if (on_stack()) st->print(" on_stack"); 1921 st->cr(); 1922 } 1923 if (pool_holder() != NULL) { 1924 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder()); 1925 } 1926 st->print_cr(" - cache: " INTPTR_FORMAT, cache()); 1927 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references()); 1928 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map()); 1929 1930 for (int index = 1; index < length(); index++) { // Index 0 is unused 1931 ((ConstantPool*)this)->print_entry_on(index, st); 1932 switch (tag_at(index).value()) { 1933 case JVM_CONSTANT_Long : 1934 case JVM_CONSTANT_Double : 1935 index++; // Skip entry following eigth-byte constant 1936 } 1937 1938 } 1939 st->cr(); 1940 } 1941 1942 // Print one constant pool entry 1943 void ConstantPool::print_entry_on(const int index, outputStream* st) { 1944 EXCEPTION_MARK; 1945 st->print(" - %3d : ", index); 1946 tag_at(index).print_on(st); 1947 st->print(" : "); 1948 switch (tag_at(index).value()) { 1949 case JVM_CONSTANT_Class : 1950 { Klass* k = klass_at(index, CATCH); 1951 guarantee(k != NULL, "need klass"); 1952 k->print_value_on(st); 1953 st->print(" {0x%lx}", (address)k); 1954 } 1955 break; 1956 case JVM_CONSTANT_Fieldref : 1957 case JVM_CONSTANT_Methodref : 1958 case JVM_CONSTANT_InterfaceMethodref : 1959 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); 1960 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); 1961 break; 1962 case JVM_CONSTANT_String : 1963 if (is_pseudo_string_at(index)) { 1964 oop anObj = pseudo_string_at(index); 1965 anObj->print_value_on(st); 1966 st->print(" {0x%lx}", (address)anObj); 1967 } else { 1968 unresolved_string_at(index)->print_value_on(st); 1969 } 1970 break; 1971 case JVM_CONSTANT_Integer : 1972 st->print("%d", int_at(index)); 1973 break; 1974 case JVM_CONSTANT_Float : 1975 st->print("%f", float_at(index)); 1976 break; 1977 case JVM_CONSTANT_Long : 1978 st->print_jlong(long_at(index)); 1979 break; 1980 case JVM_CONSTANT_Double : 1981 st->print("%lf", double_at(index)); 1982 break; 1983 case JVM_CONSTANT_NameAndType : 1984 st->print("name_index=%d", name_ref_index_at(index)); 1985 st->print(" signature_index=%d", signature_ref_index_at(index)); 1986 break; 1987 case JVM_CONSTANT_Utf8 : 1988 symbol_at(index)->print_value_on(st); 1989 break; 1990 case JVM_CONSTANT_UnresolvedClass : // fall-through 1991 case JVM_CONSTANT_UnresolvedClassInError: { 1992 // unresolved_klass_at requires lock or safe world. 1993 CPSlot entry = slot_at(index); 1994 if (entry.is_resolved()) { 1995 entry.get_klass()->print_value_on(st); 1996 } else { 1997 entry.get_symbol()->print_value_on(st); 1998 } 1999 } 2000 break; 2001 case JVM_CONSTANT_MethodHandle : 2002 case JVM_CONSTANT_MethodHandleInError : 2003 st->print("ref_kind=%d", method_handle_ref_kind_at(index)); 2004 st->print(" ref_index=%d", method_handle_index_at(index)); 2005 break; 2006 case JVM_CONSTANT_MethodType : 2007 case JVM_CONSTANT_MethodTypeInError : 2008 st->print("signature_index=%d", method_type_index_at(index)); 2009 break; 2010 case JVM_CONSTANT_InvokeDynamic : 2011 { 2012 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); 2013 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); 2014 int argc = invoke_dynamic_argument_count_at(index); 2015 if (argc > 0) { 2016 for (int arg_i = 0; arg_i < argc; arg_i++) { 2017 int arg = invoke_dynamic_argument_index_at(index, arg_i); 2018 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 2019 } 2020 st->print("}"); 2021 } 2022 } 2023 break; 2024 default: 2025 ShouldNotReachHere(); 2026 break; 2027 } 2028 st->cr(); 2029 } 2030 2031 void ConstantPool::print_value_on(outputStream* st) const { 2032 assert(is_constantPool(), "must be constantPool"); 2033 st->print("constant pool [%d]", length()); 2034 if (has_preresolution()) st->print("/preresolution"); 2035 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); 2036 print_address_on(st); 2037 st->print(" for "); 2038 pool_holder()->print_value_on(st); 2039 if (pool_holder() != NULL) { 2040 bool extra = (pool_holder()->constants() != this); 2041 if (extra) st->print(" (extra)"); 2042 } 2043 if (cache() != NULL) { 2044 st->print(" cache=" PTR_FORMAT, cache()); 2045 } 2046 } 2047 2048 #if INCLUDE_SERVICES 2049 // Size Statistics 2050 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { 2051 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); 2052 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); 2053 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); 2054 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); 2055 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); 2056 2057 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + 2058 sz->_cp_refmap_bytes; 2059 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; 2060 } 2061 #endif // INCLUDE_SERVICES 2062 2063 // Verification 2064 2065 void ConstantPool::verify_on(outputStream* st) { 2066 guarantee(is_constantPool(), "object must be constant pool"); 2067 for (int i = 0; i< length(); i++) { 2068 constantTag tag = tag_at(i); 2069 CPSlot entry = slot_at(i); 2070 if (tag.is_klass()) { 2071 if (entry.is_resolved()) { 2072 guarantee(entry.get_klass()->is_klass(), "should be klass"); 2073 } 2074 } else if (tag.is_unresolved_klass()) { 2075 if (entry.is_resolved()) { 2076 guarantee(entry.get_klass()->is_klass(), "should be klass"); 2077 } 2078 } else if (tag.is_symbol()) { 2079 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2080 } else if (tag.is_string()) { 2081 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2082 } 2083 } 2084 if (cache() != NULL) { 2085 // Note: cache() can be NULL before a class is completely setup or 2086 // in temporary constant pools used during constant pool merging 2087 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); 2088 } 2089 if (pool_holder() != NULL) { 2090 // Note: pool_holder() can be NULL in temporary constant pools 2091 // used during constant pool merging 2092 guarantee(pool_holder()->is_klass(), "should be klass"); 2093 } 2094 } 2095 2096 2097 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { 2098 char *str = sym->as_utf8(); 2099 unsigned int hash = compute_hash(str, sym->utf8_length()); 2100 unsigned int index = hash % table_size(); 2101 2102 // check if already in map 2103 // we prefer the first entry since it is more likely to be what was used in 2104 // the class file 2105 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2106 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2107 if (en->hash() == hash && en->symbol() == sym) { 2108 return; // already there 2109 } 2110 } 2111 2112 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); 2113 entry->set_next(bucket(index)); 2114 _buckets[index].set_entry(entry); 2115 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2116 } 2117 2118 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { 2119 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); 2120 char *str = sym->as_utf8(); 2121 int len = sym->utf8_length(); 2122 unsigned int hash = SymbolHashMap::compute_hash(str, len); 2123 unsigned int index = hash % table_size(); 2124 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2125 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2126 if (en->hash() == hash && en->symbol() == sym) { 2127 return en; 2128 } 2129 } 2130 return NULL; 2131 }