1 /* 2 * Copyright (c) 1997, 2016, 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 "memory/resourceArea.hpp" 37 #include "oops/constantPool.hpp" 38 #include "oops/instanceKlass.hpp" 39 #include "oops/objArrayKlass.hpp" 40 #include "oops/objArrayOop.inline.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "runtime/fieldType.hpp" 43 #include "runtime/init.hpp" 44 #include "runtime/javaCalls.hpp" 45 #include "runtime/signature.hpp" 46 #include "runtime/vframe.hpp" 47 #include "utilities/copy.hpp" 48 49 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { 50 // Tags are RW but comment below applies to tags also. 51 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); 52 53 int size = ConstantPool::size(length); 54 55 // CDS considerations: 56 // Allocate read-write but may be able to move to read-only at dumping time 57 // if all the klasses are resolved. The only other field that is writable is 58 // the resolved_references array, which is recreated at startup time. 59 // But that could be moved to InstanceKlass (although a pain to access from 60 // assembly code). Maybe it could be moved to the cpCache which is RW. 61 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); 62 } 63 64 #ifdef ASSERT 65 66 // MetaspaceObj allocation invariant is calloc equivalent memory 67 // simple verification of this here (JVM_CONSTANT_Invalid == 0 ) 68 static bool tag_array_is_zero_initialized(Array<u1>* tags) { 69 assert(tags != NULL, "invariant"); 70 const int length = tags->length(); 71 for (int index = 0; index < length; ++index) { 72 if (JVM_CONSTANT_Invalid != tags->at(index)) { 73 return false; 74 } 75 } 76 return true; 77 } 78 79 #endif 80 81 ConstantPool::ConstantPool(Array<u1>* tags) : 82 _tags(tags), 83 _length(tags->length()), 84 _flags(0) { 85 86 assert(_tags != NULL, "invariant"); 87 assert(tags->length() == _length, "invariant"); 88 assert(tag_array_is_zero_initialized(tags), "invariant"); 89 assert(0 == _flags, "invariant"); 90 assert(0 == version(), "invariant"); 91 assert(NULL == _pool_holder, "invariant"); 92 } 93 94 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { 95 MetadataFactory::free_metadata(loader_data, cache()); 96 set_cache(NULL); 97 MetadataFactory::free_array<u2>(loader_data, reference_map()); 98 set_reference_map(NULL); 99 100 MetadataFactory::free_array<jushort>(loader_data, operands()); 101 set_operands(NULL); 102 103 release_C_heap_structures(); 104 105 // free tag array 106 MetadataFactory::free_array<u1>(loader_data, tags()); 107 set_tags(NULL); 108 } 109 110 void ConstantPool::release_C_heap_structures() { 111 // walk constant pool and decrement symbol reference counts 112 unreference_symbols(); 113 } 114 115 objArrayOop ConstantPool::resolved_references() const { 116 return (objArrayOop)JNIHandles::resolve(_resolved_references); 117 } 118 119 // Create resolved_references array and mapping array for original cp indexes 120 // The ldc bytecode was rewritten to have the resolved reference array index so need a way 121 // to map it back for resolving and some unlikely miscellaneous uses. 122 // The objects created by invokedynamic are appended to this list. 123 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, 124 const intStack& reference_map, 125 int constant_pool_map_length, 126 TRAPS) { 127 // Initialized the resolved object cache. 128 int map_length = reference_map.length(); 129 if (map_length > 0) { 130 // Only need mapping back to constant pool entries. The map isn't used for 131 // invokedynamic resolved_reference entries. For invokedynamic entries, 132 // the constant pool cache index has the mapping back to both the constant 133 // pool and to the resolved reference index. 134 if (constant_pool_map_length > 0) { 135 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK); 136 137 for (int i = 0; i < constant_pool_map_length; i++) { 138 int x = reference_map.at(i); 139 assert(x == (int)(jushort) x, "klass index is too big"); 140 om->at_put(i, (jushort)x); 141 } 142 set_reference_map(om); 143 } 144 145 // Create Java array for holding resolved strings, methodHandles, 146 // methodTypes, invokedynamic and invokehandle appendix objects, etc. 147 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 148 Handle refs_handle (THREAD, (oop)stom); // must handleize. 149 set_resolved_references(loader_data->add_handle(refs_handle)); 150 } 151 } 152 153 // CDS support. Create a new resolved_references array. 154 void ConstantPool::restore_unshareable_info(TRAPS) { 155 156 // Only create the new resolved references array if it hasn't been attempted before 157 if (resolved_references() != NULL) return; 158 159 // restore the C++ vtable from the shared archive 160 restore_vtable(); 161 162 if (SystemDictionary::Object_klass_loaded()) { 163 // Recreate the object array and add to ClassLoaderData. 164 int map_length = resolved_reference_length(); 165 if (map_length > 0) { 166 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 167 Handle refs_handle (THREAD, (oop)stom); // must handleize. 168 169 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 170 set_resolved_references(loader_data->add_handle(refs_handle)); 171 } 172 } 173 } 174 175 void ConstantPool::remove_unshareable_info() { 176 // Resolved references are not in the shared archive. 177 // Save the length for restoration. It is not necessarily the same length 178 // as reference_map.length() if invokedynamic is saved. 179 set_resolved_reference_length( 180 resolved_references() != NULL ? resolved_references()->length() : 0); 181 set_resolved_references(NULL); 182 } 183 184 int ConstantPool::cp_to_object_index(int cp_index) { 185 // this is harder don't do this so much. 186 int i = reference_map()->find(cp_index); 187 // We might not find the index for jsr292 call. 188 return (i < 0) ? _no_index_sentinel : i; 189 } 190 191 void ConstantPool::string_at_put(int which, int obj_index, oop str) { 192 resolved_references()->obj_at_put(obj_index, str); 193 } 194 195 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, KlassHandle k) { 196 ResourceMark rm; 197 int line_number = -1; 198 const char * source_file = NULL; 199 if (JavaThread::current()->has_last_Java_frame()) { 200 // try to identify the method which called this function. 201 vframeStream vfst(JavaThread::current()); 202 if (!vfst.at_end()) { 203 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 204 Symbol* s = vfst.method()->method_holder()->source_file_name(); 205 if (s != NULL) { 206 source_file = s->as_C_string(); 207 } 208 } 209 } 210 if (k() != this_cp->pool_holder()) { 211 // only print something if the classes are different 212 if (source_file != NULL) { 213 log_debug(class, resolve)("%s %s %s:%d", 214 this_cp->pool_holder()->external_name(), 215 k->external_name(), source_file, line_number); 216 } else { 217 log_debug(class, resolve)("%s %s", 218 this_cp->pool_holder()->external_name(), 219 k->external_name()); 220 } 221 } 222 } 223 224 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which, 225 bool save_resolution_error, TRAPS) { 226 assert(THREAD->is_Java_thread(), "must be a Java thread"); 227 228 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 229 // It is not safe to rely on the tag bit's here, since we don't have a lock, and 230 // the entry and tag is not updated atomicly. 231 CPSlot entry = this_cp->slot_at(which); 232 if (entry.is_resolved()) { 233 assert(entry.get_klass()->is_klass(), "must be"); 234 // Already resolved - return entry. 235 return entry.get_klass(); 236 } 237 238 // This tag doesn't change back to unresolved class unless at a safepoint. 239 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) { 240 // The original attempt to resolve this constant pool entry failed so find the 241 // class of the original error and throw another error of the same class 242 // (JVMS 5.4.3). 243 // If there is a detail message, pass that detail message to the error. 244 // The JVMS does not strictly require us to duplicate the same detail message, 245 // or any internal exception fields such as cause or stacktrace. But since the 246 // detail message is often a class name or other literal string, we will repeat it 247 // if we can find it in the symbol table. 248 throw_resolution_error(this_cp, which, CHECK_0); 249 ShouldNotReachHere(); 250 } 251 252 Handle mirror_handle; 253 Symbol* name = entry.get_symbol(); 254 Handle loader (THREAD, this_cp->pool_holder()->class_loader()); 255 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain()); 256 Klass* kk = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD); 257 KlassHandle k (THREAD, kk); 258 if (!HAS_PENDING_EXCEPTION) { 259 // preserve the resolved klass from unloading 260 mirror_handle = Handle(THREAD, kk->java_mirror()); 261 // Do access check for klasses 262 verify_constant_pool_resolve(this_cp, k, THREAD); 263 } 264 265 // Failed to resolve class. We must record the errors so that subsequent attempts 266 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). 267 if (HAS_PENDING_EXCEPTION) { 268 if (save_resolution_error) { 269 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL); 270 // If CHECK_NULL above doesn't return the exception, that means that 271 // some other thread has beaten us and has resolved the class. 272 // To preserve old behavior, we return the resolved class. 273 entry = this_cp->resolved_klass_at(which); 274 assert(entry.is_resolved(), "must be resolved if exception was cleared"); 275 assert(entry.get_klass()->is_klass(), "must be resolved to a klass"); 276 return entry.get_klass(); 277 } else { 278 return NULL; // return the pending exception 279 } 280 } 281 282 // Make this class loader depend upon the class loader owning the class reference 283 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data(); 284 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM 285 286 // logging for class+resolve. 287 if (log_is_enabled(Debug, class, resolve)){ 288 trace_class_resolution(this_cp, k); 289 } 290 this_cp->klass_at_put(which, k()); 291 entry = this_cp->resolved_klass_at(which); 292 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); 293 return entry.get_klass(); 294 } 295 296 297 // Does not update ConstantPool* - to avoid any exception throwing. Used 298 // by compiler and exception handling. Also used to avoid classloads for 299 // instanceof operations. Returns NULL if the class has not been loaded or 300 // if the verification of constant pool failed 301 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) { 302 CPSlot entry = this_cp->slot_at(which); 303 if (entry.is_resolved()) { 304 assert(entry.get_klass()->is_klass(), "must be"); 305 return entry.get_klass(); 306 } else { 307 assert(entry.is_unresolved(), "must be either symbol or klass"); 308 Thread *thread = Thread::current(); 309 Symbol* name = entry.get_symbol(); 310 oop loader = this_cp->pool_holder()->class_loader(); 311 oop protection_domain = this_cp->pool_holder()->protection_domain(); 312 Handle h_prot (thread, protection_domain); 313 Handle h_loader (thread, loader); 314 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); 315 316 if (k != NULL) { 317 // Make sure that resolving is legal 318 EXCEPTION_MARK; 319 KlassHandle klass(THREAD, k); 320 // return NULL if verification fails 321 verify_constant_pool_resolve(this_cp, klass, THREAD); 322 if (HAS_PENDING_EXCEPTION) { 323 CLEAR_PENDING_EXCEPTION; 324 return NULL; 325 } 326 return klass(); 327 } else { 328 return k; 329 } 330 } 331 } 332 333 334 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) { 335 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which)); 336 } 337 338 339 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool, 340 int which) { 341 if (cpool->cache() == NULL) return NULL; // nothing to load yet 342 int cache_index = decode_cpcache_index(which, true); 343 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { 344 // FIXME: should be an assert 345 log_debug(class, resolve)("bad operand %d in:", which); cpool->print(); 346 return NULL; 347 } 348 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 349 return e->method_if_resolved(cpool); 350 } 351 352 353 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 354 if (cpool->cache() == NULL) return false; // nothing to load yet 355 int cache_index = decode_cpcache_index(which, true); 356 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 357 return e->has_appendix(); 358 } 359 360 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 361 if (cpool->cache() == NULL) return NULL; // nothing to load yet 362 int cache_index = decode_cpcache_index(which, true); 363 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 364 return e->appendix_if_resolved(cpool); 365 } 366 367 368 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) { 369 if (cpool->cache() == NULL) return false; // nothing to load yet 370 int cache_index = decode_cpcache_index(which, true); 371 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 372 return e->has_method_type(); 373 } 374 375 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) { 376 if (cpool->cache() == NULL) return NULL; // nothing to load yet 377 int cache_index = decode_cpcache_index(which, true); 378 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 379 return e->method_type_if_resolved(cpool); 380 } 381 382 383 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { 384 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 385 return symbol_at(name_index); 386 } 387 388 389 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { 390 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 391 return symbol_at(signature_index); 392 } 393 394 395 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { 396 int i = which; 397 if (!uncached && cache() != NULL) { 398 if (ConstantPool::is_invokedynamic_index(which)) { 399 // Invokedynamic index is index into the constant pool cache 400 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); 401 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); 402 assert(tag_at(pool_index).is_name_and_type(), ""); 403 return pool_index; 404 } 405 // change byte-ordering and go via cache 406 i = remap_instruction_operand_from_cache(which); 407 } else { 408 if (tag_at(which).is_invoke_dynamic()) { 409 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); 410 assert(tag_at(pool_index).is_name_and_type(), ""); 411 return pool_index; 412 } 413 } 414 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 415 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); 416 jint ref_index = *int_at_addr(i); 417 return extract_high_short_from_int(ref_index); 418 } 419 420 421 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { 422 guarantee(!ConstantPool::is_invokedynamic_index(which), 423 "an invokedynamic instruction does not have a klass"); 424 int i = which; 425 if (!uncached && cache() != NULL) { 426 // change byte-ordering and go via cache 427 i = remap_instruction_operand_from_cache(which); 428 } 429 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 430 jint ref_index = *int_at_addr(i); 431 return extract_low_short_from_int(ref_index); 432 } 433 434 435 436 int ConstantPool::remap_instruction_operand_from_cache(int operand) { 437 int cpc_index = operand; 438 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); 439 assert((int)(u2)cpc_index == cpc_index, "clean u2"); 440 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); 441 return member_index; 442 } 443 444 445 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, KlassHandle k, TRAPS) { 446 if (k->is_instance_klass() || k->is_objArray_klass()) { 447 instanceKlassHandle holder (THREAD, this_cp->pool_holder()); 448 Klass* elem = k->is_instance_klass() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); 449 KlassHandle element (THREAD, elem); 450 451 // The element type could be a typeArray - we only need the access check if it is 452 // an reference to another class 453 if (element->is_instance_klass()) { 454 LinkResolver::check_klass_accessability(holder, element, CHECK); 455 } 456 } 457 } 458 459 460 int ConstantPool::name_ref_index_at(int which_nt) { 461 jint ref_index = name_and_type_at(which_nt); 462 return extract_low_short_from_int(ref_index); 463 } 464 465 466 int ConstantPool::signature_ref_index_at(int which_nt) { 467 jint ref_index = name_and_type_at(which_nt); 468 return extract_high_short_from_int(ref_index); 469 } 470 471 472 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { 473 return klass_at(klass_ref_index_at(which), THREAD); 474 } 475 476 477 Symbol* ConstantPool::klass_name_at(int which) const { 478 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), 479 "Corrupted constant pool"); 480 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 481 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and 482 // tag is not updated atomicly. 483 CPSlot entry = slot_at(which); 484 if (entry.is_resolved()) { 485 // Already resolved - return entry's name. 486 assert(entry.get_klass()->is_klass(), "must be"); 487 return entry.get_klass()->name(); 488 } else { 489 assert(entry.is_unresolved(), "must be either symbol or klass"); 490 return entry.get_symbol(); 491 } 492 } 493 494 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { 495 jint ref_index = klass_ref_index_at(which); 496 return klass_at_noresolve(ref_index); 497 } 498 499 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { 500 jint ref_index = uncached_klass_ref_index_at(which); 501 return klass_at_noresolve(ref_index); 502 } 503 504 char* ConstantPool::string_at_noresolve(int which) { 505 return unresolved_string_at(which)->as_C_string(); 506 } 507 508 BasicType ConstantPool::basic_type_for_signature_at(int which) const { 509 return FieldType::basic_type(symbol_at(which)); 510 } 511 512 513 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) { 514 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused 515 if (this_cp->tag_at(index).is_string()) { 516 this_cp->string_at(index, CHECK); 517 } 518 } 519 } 520 521 // Resolve all the classes in the constant pool. If they are all resolved, 522 // the constant pool is read-only. Enhancement: allocate cp entries to 523 // another metaspace, and copy to read-only or read-write space if this 524 // bit is set. 525 bool ConstantPool::resolve_class_constants(TRAPS) { 526 constantPoolHandle cp(THREAD, this); 527 for (int index = 1; index < length(); index++) { // Index 0 is unused 528 if (tag_at(index).is_unresolved_klass() && 529 klass_at_if_loaded(cp, index) == NULL) { 530 return false; 531 } 532 } 533 // set_preresolution(); or some bit for future use 534 return true; 535 } 536 537 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) { 538 // Dig out the detailed message to reuse if possible 539 Symbol* message = java_lang_Throwable::detail_message(pending_exception); 540 if (message != NULL) { 541 return message; 542 } 543 544 // Return specific message for the tag 545 switch (tag.value()) { 546 case JVM_CONSTANT_UnresolvedClass: 547 // return the class name in the error message 548 message = this_cp->klass_name_at(which); 549 break; 550 case JVM_CONSTANT_MethodHandle: 551 // return the method handle name in the error message 552 message = this_cp->method_handle_name_ref_at(which); 553 break; 554 case JVM_CONSTANT_MethodType: 555 // return the method type signature in the error message 556 message = this_cp->method_type_signature_at(which); 557 break; 558 default: 559 ShouldNotReachHere(); 560 } 561 562 return message; 563 } 564 565 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) { 566 Symbol* message = NULL; 567 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message); 568 assert(error != NULL && message != NULL, "checking"); 569 CLEAR_PENDING_EXCEPTION; 570 ResourceMark rm; 571 THROW_MSG(error, message->as_C_string()); 572 } 573 574 // If resolution for Class, MethodHandle or MethodType fails, save the exception 575 // in the resolution error table, so that the same exception is thrown again. 576 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which, 577 constantTag tag, TRAPS) { 578 Symbol* error = PENDING_EXCEPTION->klass()->name(); 579 580 int error_tag = tag.error_value(); 581 582 if (!PENDING_EXCEPTION-> 583 is_a(SystemDictionary::LinkageError_klass())) { 584 // Just throw the exception and don't prevent these classes from 585 // being loaded due to virtual machine errors like StackOverflow 586 // and OutOfMemoryError, etc, or if the thread was hit by stop() 587 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 588 } else if (this_cp->tag_at(which).value() != error_tag) { 589 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION); 590 SystemDictionary::add_resolution_error(this_cp, which, error, message); 591 // CAS in the tag. If a thread beat us to registering this error that's fine. 592 // If another thread resolved the reference, this is a race condition. This 593 // thread may have had a security manager or something temporary. 594 // This doesn't deterministically get an error. So why do we save this? 595 // We save this because jvmti can add classes to the bootclass path after 596 // this error, so it needs to get the same error if the error is first. 597 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag, 598 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value()); 599 if (old_tag != error_tag && old_tag != tag.value()) { 600 // MethodHandles and MethodType doesn't change to resolved version. 601 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value"); 602 // Forget the exception and use the resolved class. 603 CLEAR_PENDING_EXCEPTION; 604 } 605 } else { 606 // some other thread put this in error state 607 throw_resolution_error(this_cp, which, CHECK); 608 } 609 } 610 611 // Called to resolve constants in the constant pool and return an oop. 612 // Some constant pool entries cache their resolved oop. This is also 613 // called to create oops from constants to use in arguments for invokedynamic 614 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) { 615 oop result_oop = NULL; 616 Handle throw_exception; 617 618 if (cache_index == _possible_index_sentinel) { 619 // It is possible that this constant is one which is cached in the objects. 620 // We'll do a linear search. This should be OK because this usage is rare. 621 assert(index > 0, "valid index"); 622 cache_index = this_cp->cp_to_object_index(index); 623 } 624 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); 625 assert(index == _no_index_sentinel || index >= 0, ""); 626 627 if (cache_index >= 0) { 628 result_oop = this_cp->resolved_references()->obj_at(cache_index); 629 if (result_oop != NULL) { 630 return result_oop; 631 // That was easy... 632 } 633 index = this_cp->object_to_cp_index(cache_index); 634 } 635 636 jvalue prim_value; // temp used only in a few cases below 637 638 constantTag tag = this_cp->tag_at(index); 639 640 switch (tag.value()) { 641 642 case JVM_CONSTANT_UnresolvedClass: 643 case JVM_CONSTANT_UnresolvedClassInError: 644 case JVM_CONSTANT_Class: 645 { 646 assert(cache_index == _no_index_sentinel, "should not have been set"); 647 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL); 648 // ldc wants the java mirror. 649 result_oop = resolved->java_mirror(); 650 break; 651 } 652 653 case JVM_CONSTANT_String: 654 assert(cache_index != _no_index_sentinel, "should have been set"); 655 if (this_cp->is_pseudo_string_at(index)) { 656 result_oop = this_cp->pseudo_string_at(index, cache_index); 657 break; 658 } 659 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL); 660 break; 661 662 case JVM_CONSTANT_MethodHandleInError: 663 case JVM_CONSTANT_MethodTypeInError: 664 { 665 throw_resolution_error(this_cp, index, CHECK_NULL); 666 break; 667 } 668 669 case JVM_CONSTANT_MethodHandle: 670 { 671 int ref_kind = this_cp->method_handle_ref_kind_at(index); 672 int callee_index = this_cp->method_handle_klass_index_at(index); 673 Symbol* name = this_cp->method_handle_name_ref_at(index); 674 Symbol* signature = this_cp->method_handle_signature_ref_at(index); 675 { ResourceMark rm(THREAD); 676 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", 677 ref_kind, index, this_cp->method_handle_index_at(index), 678 callee_index, name->as_C_string(), signature->as_C_string()); 679 } 680 KlassHandle callee; 681 { Klass* k = klass_at_impl(this_cp, callee_index, true, CHECK_NULL); 682 callee = KlassHandle(THREAD, k); 683 } 684 KlassHandle klass(THREAD, this_cp->pool_holder()); 685 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, 686 callee, name, signature, 687 THREAD); 688 result_oop = value(); 689 if (HAS_PENDING_EXCEPTION) { 690 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 691 } 692 break; 693 } 694 695 case JVM_CONSTANT_MethodType: 696 { 697 Symbol* signature = this_cp->method_type_signature_at(index); 698 { ResourceMark rm(THREAD); 699 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s", 700 index, this_cp->method_type_index_at(index), 701 signature->as_C_string()); 702 } 703 KlassHandle klass(THREAD, this_cp->pool_holder()); 704 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); 705 result_oop = value(); 706 if (HAS_PENDING_EXCEPTION) { 707 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 708 } 709 break; 710 } 711 712 case JVM_CONSTANT_Integer: 713 assert(cache_index == _no_index_sentinel, "should not have been set"); 714 prim_value.i = this_cp->int_at(index); 715 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); 716 break; 717 718 case JVM_CONSTANT_Float: 719 assert(cache_index == _no_index_sentinel, "should not have been set"); 720 prim_value.f = this_cp->float_at(index); 721 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); 722 break; 723 724 case JVM_CONSTANT_Long: 725 assert(cache_index == _no_index_sentinel, "should not have been set"); 726 prim_value.j = this_cp->long_at(index); 727 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); 728 break; 729 730 case JVM_CONSTANT_Double: 731 assert(cache_index == _no_index_sentinel, "should not have been set"); 732 prim_value.d = this_cp->double_at(index); 733 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); 734 break; 735 736 default: 737 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", 738 this_cp(), index, cache_index, tag.value())); 739 assert(false, "unexpected constant tag"); 740 break; 741 } 742 743 if (cache_index >= 0) { 744 // Benign race condition: resolved_references may already be filled in. 745 // The important thing here is that all threads pick up the same result. 746 // It doesn't matter which racing thread wins, as long as only one 747 // result is used by all threads, and all future queries. 748 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL); 749 if (old_result == NULL) { 750 return result_oop; // was installed 751 } else { 752 // Return the winning thread's result. This can be different than 753 // the result here for MethodHandles. 754 return old_result; 755 } 756 } else { 757 return result_oop; 758 } 759 } 760 761 oop ConstantPool::uncached_string_at(int which, TRAPS) { 762 Symbol* sym = unresolved_string_at(which); 763 oop str = StringTable::intern(sym, CHECK_(NULL)); 764 assert(java_lang_String::is_instance(str), "must be string"); 765 return str; 766 } 767 768 769 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) { 770 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); 771 772 Handle bsm; 773 int argc; 774 { 775 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments 776 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. 777 // It is accompanied by the optional arguments. 778 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index); 779 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); 780 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { 781 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); 782 } 783 784 // Extract the optional static arguments. 785 argc = this_cp->invoke_dynamic_argument_count_at(index); 786 if (argc == 0) return bsm_oop; 787 788 bsm = Handle(THREAD, bsm_oop); 789 } 790 791 objArrayHandle info; 792 { 793 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); 794 info = objArrayHandle(THREAD, info_oop); 795 } 796 797 info->obj_at_put(0, bsm()); 798 for (int i = 0; i < argc; i++) { 799 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i); 800 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); 801 info->obj_at_put(1+i, arg_oop); 802 } 803 804 return info(); 805 } 806 807 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) { 808 // If the string has already been interned, this entry will be non-null 809 oop str = this_cp->resolved_references()->obj_at(obj_index); 810 if (str != NULL) return str; 811 Symbol* sym = this_cp->unresolved_string_at(which); 812 str = StringTable::intern(sym, CHECK_(NULL)); 813 this_cp->string_at_put(which, obj_index, str); 814 assert(java_lang_String::is_instance(str), "must be string"); 815 return str; 816 } 817 818 819 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, 820 int which) { 821 // Names are interned, so we can compare Symbol*s directly 822 Symbol* cp_name = klass_name_at(which); 823 return (cp_name == k->name()); 824 } 825 826 827 // Iterate over symbols and decrement ones which are Symbol*s 828 // This is done during GC. 829 // Only decrement the UTF8 symbols. Unresolved classes and strings point to 830 // these symbols but didn't increment the reference count. 831 void ConstantPool::unreference_symbols() { 832 for (int index = 1; index < length(); index++) { // Index 0 is unused 833 constantTag tag = tag_at(index); 834 if (tag.is_symbol()) { 835 symbol_at(index)->decrement_refcount(); 836 } 837 } 838 } 839 840 841 // Compare this constant pool's entry at index1 to the constant pool 842 // cp2's entry at index2. 843 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2, 844 int index2, TRAPS) { 845 846 // The error tags are equivalent to non-error tags when comparing 847 jbyte t1 = tag_at(index1).non_error_value(); 848 jbyte t2 = cp2->tag_at(index2).non_error_value(); 849 850 if (t1 != t2) { 851 // Not the same entry type so there is nothing else to check. Note 852 // that this style of checking will consider resolved/unresolved 853 // class pairs as different. 854 // From the ConstantPool* API point of view, this is correct 855 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this 856 // plays out in the context of ConstantPool* merging. 857 return false; 858 } 859 860 switch (t1) { 861 case JVM_CONSTANT_Class: 862 { 863 Klass* k1 = klass_at(index1, CHECK_false); 864 Klass* k2 = cp2->klass_at(index2, CHECK_false); 865 if (k1 == k2) { 866 return true; 867 } 868 } break; 869 870 case JVM_CONSTANT_ClassIndex: 871 { 872 int recur1 = klass_index_at(index1); 873 int recur2 = cp2->klass_index_at(index2); 874 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 875 if (match) { 876 return true; 877 } 878 } break; 879 880 case JVM_CONSTANT_Double: 881 { 882 jdouble d1 = double_at(index1); 883 jdouble d2 = cp2->double_at(index2); 884 if (d1 == d2) { 885 return true; 886 } 887 } break; 888 889 case JVM_CONSTANT_Fieldref: 890 case JVM_CONSTANT_InterfaceMethodref: 891 case JVM_CONSTANT_Methodref: 892 { 893 int recur1 = uncached_klass_ref_index_at(index1); 894 int recur2 = cp2->uncached_klass_ref_index_at(index2); 895 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 896 if (match) { 897 recur1 = uncached_name_and_type_ref_index_at(index1); 898 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); 899 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 900 if (match) { 901 return true; 902 } 903 } 904 } break; 905 906 case JVM_CONSTANT_Float: 907 { 908 jfloat f1 = float_at(index1); 909 jfloat f2 = cp2->float_at(index2); 910 if (f1 == f2) { 911 return true; 912 } 913 } break; 914 915 case JVM_CONSTANT_Integer: 916 { 917 jint i1 = int_at(index1); 918 jint i2 = cp2->int_at(index2); 919 if (i1 == i2) { 920 return true; 921 } 922 } break; 923 924 case JVM_CONSTANT_Long: 925 { 926 jlong l1 = long_at(index1); 927 jlong l2 = cp2->long_at(index2); 928 if (l1 == l2) { 929 return true; 930 } 931 } break; 932 933 case JVM_CONSTANT_NameAndType: 934 { 935 int recur1 = name_ref_index_at(index1); 936 int recur2 = cp2->name_ref_index_at(index2); 937 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 938 if (match) { 939 recur1 = signature_ref_index_at(index1); 940 recur2 = cp2->signature_ref_index_at(index2); 941 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 942 if (match) { 943 return true; 944 } 945 } 946 } break; 947 948 case JVM_CONSTANT_StringIndex: 949 { 950 int recur1 = string_index_at(index1); 951 int recur2 = cp2->string_index_at(index2); 952 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 953 if (match) { 954 return true; 955 } 956 } break; 957 958 case JVM_CONSTANT_UnresolvedClass: 959 { 960 Symbol* k1 = klass_name_at(index1); 961 Symbol* k2 = cp2->klass_name_at(index2); 962 if (k1 == k2) { 963 return true; 964 } 965 } break; 966 967 case JVM_CONSTANT_MethodType: 968 { 969 int k1 = method_type_index_at(index1); 970 int k2 = cp2->method_type_index_at(index2); 971 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 972 if (match) { 973 return true; 974 } 975 } break; 976 977 case JVM_CONSTANT_MethodHandle: 978 { 979 int k1 = method_handle_ref_kind_at(index1); 980 int k2 = cp2->method_handle_ref_kind_at(index2); 981 if (k1 == k2) { 982 int i1 = method_handle_index_at(index1); 983 int i2 = cp2->method_handle_index_at(index2); 984 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); 985 if (match) { 986 return true; 987 } 988 } 989 } break; 990 991 case JVM_CONSTANT_InvokeDynamic: 992 { 993 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); 994 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); 995 int i1 = invoke_dynamic_bootstrap_specifier_index(index1); 996 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); 997 // separate statements and variables because CHECK_false is used 998 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); 999 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); 1000 return (match_entry && match_operand); 1001 } break; 1002 1003 case JVM_CONSTANT_String: 1004 { 1005 Symbol* s1 = unresolved_string_at(index1); 1006 Symbol* s2 = cp2->unresolved_string_at(index2); 1007 if (s1 == s2) { 1008 return true; 1009 } 1010 } break; 1011 1012 case JVM_CONSTANT_Utf8: 1013 { 1014 Symbol* s1 = symbol_at(index1); 1015 Symbol* s2 = cp2->symbol_at(index2); 1016 if (s1 == s2) { 1017 return true; 1018 } 1019 } break; 1020 1021 // Invalid is used as the tag for the second constant pool entry 1022 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1023 // not be seen by itself. 1024 case JVM_CONSTANT_Invalid: // fall through 1025 1026 default: 1027 ShouldNotReachHere(); 1028 break; 1029 } 1030 1031 return false; 1032 } // end compare_entry_to() 1033 1034 1035 // Resize the operands array with delta_len and delta_size. 1036 // Used in RedefineClasses for CP merge. 1037 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { 1038 int old_len = operand_array_length(operands()); 1039 int new_len = old_len + delta_len; 1040 int min_len = (delta_len > 0) ? old_len : new_len; 1041 1042 int old_size = operands()->length(); 1043 int new_size = old_size + delta_size; 1044 int min_size = (delta_size > 0) ? old_size : new_size; 1045 1046 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1047 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); 1048 1049 // Set index in the resized array for existing elements only 1050 for (int idx = 0; idx < min_len; idx++) { 1051 int offset = operand_offset_at(idx); // offset in original array 1052 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array 1053 } 1054 // Copy the bootstrap specifiers only 1055 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), 1056 new_ops->adr_at(2*new_len), 1057 (min_size - 2*min_len) * sizeof(u2)); 1058 // Explicitly deallocate old operands array. 1059 // Note, it is not needed for 7u backport. 1060 if ( operands() != NULL) { // the safety check 1061 MetadataFactory::free_array<u2>(loader_data, operands()); 1062 } 1063 set_operands(new_ops); 1064 } // end resize_operands() 1065 1066 1067 // Extend the operands array with the length and size of the ext_cp operands. 1068 // Used in RedefineClasses for CP merge. 1069 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) { 1070 int delta_len = operand_array_length(ext_cp->operands()); 1071 if (delta_len == 0) { 1072 return; // nothing to do 1073 } 1074 int delta_size = ext_cp->operands()->length(); 1075 1076 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); 1077 1078 if (operand_array_length(operands()) == 0) { 1079 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1080 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); 1081 // The first element index defines the offset of second part 1082 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array 1083 set_operands(new_ops); 1084 } else { 1085 resize_operands(delta_len, delta_size, CHECK); 1086 } 1087 1088 } // end extend_operands() 1089 1090 1091 // Shrink the operands array to a smaller array with new_len length. 1092 // Used in RedefineClasses for CP merge. 1093 void ConstantPool::shrink_operands(int new_len, TRAPS) { 1094 int old_len = operand_array_length(operands()); 1095 if (new_len == old_len) { 1096 return; // nothing to do 1097 } 1098 assert(new_len < old_len, "shrunken operands array must be smaller"); 1099 1100 int free_base = operand_next_offset_at(new_len - 1); 1101 int delta_len = new_len - old_len; 1102 int delta_size = 2*delta_len + free_base - operands()->length(); 1103 1104 resize_operands(delta_len, delta_size, CHECK); 1105 1106 } // end shrink_operands() 1107 1108 1109 void ConstantPool::copy_operands(const constantPoolHandle& from_cp, 1110 const constantPoolHandle& to_cp, 1111 TRAPS) { 1112 1113 int from_oplen = operand_array_length(from_cp->operands()); 1114 int old_oplen = operand_array_length(to_cp->operands()); 1115 if (from_oplen != 0) { 1116 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); 1117 // append my operands to the target's operands array 1118 if (old_oplen == 0) { 1119 // Can't just reuse from_cp's operand list because of deallocation issues 1120 int len = from_cp->operands()->length(); 1121 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); 1122 Copy::conjoint_memory_atomic( 1123 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); 1124 to_cp->set_operands(new_ops); 1125 } else { 1126 int old_len = to_cp->operands()->length(); 1127 int from_len = from_cp->operands()->length(); 1128 int old_off = old_oplen * sizeof(u2); 1129 int from_off = from_oplen * sizeof(u2); 1130 // Use the metaspace for the destination constant pool 1131 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); 1132 int fillp = 0, len = 0; 1133 // first part of dest 1134 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), 1135 new_operands->adr_at(fillp), 1136 (len = old_off) * sizeof(u2)); 1137 fillp += len; 1138 // first part of src 1139 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), 1140 new_operands->adr_at(fillp), 1141 (len = from_off) * sizeof(u2)); 1142 fillp += len; 1143 // second part of dest 1144 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), 1145 new_operands->adr_at(fillp), 1146 (len = old_len - old_off) * sizeof(u2)); 1147 fillp += len; 1148 // second part of src 1149 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), 1150 new_operands->adr_at(fillp), 1151 (len = from_len - from_off) * sizeof(u2)); 1152 fillp += len; 1153 assert(fillp == new_operands->length(), ""); 1154 1155 // Adjust indexes in the first part of the copied operands array. 1156 for (int j = 0; j < from_oplen; j++) { 1157 int offset = operand_offset_at(new_operands, old_oplen + j); 1158 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); 1159 offset += old_len; // every new tuple is preceded by old_len extra u2's 1160 operand_offset_at_put(new_operands, old_oplen + j, offset); 1161 } 1162 1163 // replace target operands array with combined array 1164 to_cp->set_operands(new_operands); 1165 } 1166 } 1167 } // end copy_operands() 1168 1169 1170 // Copy this constant pool's entries at start_i to end_i (inclusive) 1171 // to the constant pool to_cp's entries starting at to_i. A total of 1172 // (end_i - start_i) + 1 entries are copied. 1173 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i, 1174 const constantPoolHandle& to_cp, int to_i, TRAPS) { 1175 1176 1177 int dest_i = to_i; // leave original alone for debug purposes 1178 1179 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { 1180 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); 1181 1182 switch (from_cp->tag_at(src_i).value()) { 1183 case JVM_CONSTANT_Double: 1184 case JVM_CONSTANT_Long: 1185 // double and long take two constant pool entries 1186 src_i += 2; 1187 dest_i += 2; 1188 break; 1189 1190 default: 1191 // all others take one constant pool entry 1192 src_i++; 1193 dest_i++; 1194 break; 1195 } 1196 } 1197 copy_operands(from_cp, to_cp, CHECK); 1198 1199 } // end copy_cp_to_impl() 1200 1201 1202 // Copy this constant pool's entry at from_i to the constant pool 1203 // to_cp's entry at to_i. 1204 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i, 1205 const constantPoolHandle& to_cp, int to_i, 1206 TRAPS) { 1207 1208 int tag = from_cp->tag_at(from_i).value(); 1209 switch (tag) { 1210 case JVM_CONSTANT_Class: 1211 { 1212 Klass* k = from_cp->klass_at(from_i, CHECK); 1213 to_cp->klass_at_put(to_i, k); 1214 } break; 1215 1216 case JVM_CONSTANT_ClassIndex: 1217 { 1218 jint ki = from_cp->klass_index_at(from_i); 1219 to_cp->klass_index_at_put(to_i, ki); 1220 } break; 1221 1222 case JVM_CONSTANT_Double: 1223 { 1224 jdouble d = from_cp->double_at(from_i); 1225 to_cp->double_at_put(to_i, d); 1226 // double takes two constant pool entries so init second entry's tag 1227 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1228 } break; 1229 1230 case JVM_CONSTANT_Fieldref: 1231 { 1232 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1233 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1234 to_cp->field_at_put(to_i, class_index, name_and_type_index); 1235 } break; 1236 1237 case JVM_CONSTANT_Float: 1238 { 1239 jfloat f = from_cp->float_at(from_i); 1240 to_cp->float_at_put(to_i, f); 1241 } break; 1242 1243 case JVM_CONSTANT_Integer: 1244 { 1245 jint i = from_cp->int_at(from_i); 1246 to_cp->int_at_put(to_i, i); 1247 } break; 1248 1249 case JVM_CONSTANT_InterfaceMethodref: 1250 { 1251 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1252 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1253 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); 1254 } break; 1255 1256 case JVM_CONSTANT_Long: 1257 { 1258 jlong l = from_cp->long_at(from_i); 1259 to_cp->long_at_put(to_i, l); 1260 // long takes two constant pool entries so init second entry's tag 1261 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1262 } break; 1263 1264 case JVM_CONSTANT_Methodref: 1265 { 1266 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1267 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1268 to_cp->method_at_put(to_i, class_index, name_and_type_index); 1269 } break; 1270 1271 case JVM_CONSTANT_NameAndType: 1272 { 1273 int name_ref_index = from_cp->name_ref_index_at(from_i); 1274 int signature_ref_index = from_cp->signature_ref_index_at(from_i); 1275 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); 1276 } break; 1277 1278 case JVM_CONSTANT_StringIndex: 1279 { 1280 jint si = from_cp->string_index_at(from_i); 1281 to_cp->string_index_at_put(to_i, si); 1282 } break; 1283 1284 case JVM_CONSTANT_UnresolvedClass: 1285 case JVM_CONSTANT_UnresolvedClassInError: 1286 { 1287 // Can be resolved after checking tag, so check the slot first. 1288 CPSlot entry = from_cp->slot_at(from_i); 1289 if (entry.is_resolved()) { 1290 assert(entry.get_klass()->is_klass(), "must be"); 1291 // Already resolved 1292 to_cp->klass_at_put(to_i, entry.get_klass()); 1293 } else { 1294 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); 1295 } 1296 } break; 1297 1298 case JVM_CONSTANT_String: 1299 { 1300 Symbol* s = from_cp->unresolved_string_at(from_i); 1301 to_cp->unresolved_string_at_put(to_i, s); 1302 } break; 1303 1304 case JVM_CONSTANT_Utf8: 1305 { 1306 Symbol* s = from_cp->symbol_at(from_i); 1307 // Need to increase refcount, the old one will be thrown away and deferenced 1308 s->increment_refcount(); 1309 to_cp->symbol_at_put(to_i, s); 1310 } break; 1311 1312 case JVM_CONSTANT_MethodType: 1313 case JVM_CONSTANT_MethodTypeInError: 1314 { 1315 jint k = from_cp->method_type_index_at(from_i); 1316 to_cp->method_type_index_at_put(to_i, k); 1317 } break; 1318 1319 case JVM_CONSTANT_MethodHandle: 1320 case JVM_CONSTANT_MethodHandleInError: 1321 { 1322 int k1 = from_cp->method_handle_ref_kind_at(from_i); 1323 int k2 = from_cp->method_handle_index_at(from_i); 1324 to_cp->method_handle_index_at_put(to_i, k1, k2); 1325 } break; 1326 1327 case JVM_CONSTANT_InvokeDynamic: 1328 { 1329 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); 1330 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); 1331 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1332 to_cp->invoke_dynamic_at_put(to_i, k1, k2); 1333 } break; 1334 1335 // Invalid is used as the tag for the second constant pool entry 1336 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1337 // not be seen by itself. 1338 case JVM_CONSTANT_Invalid: // fall through 1339 1340 default: 1341 { 1342 ShouldNotReachHere(); 1343 } break; 1344 } 1345 } // end copy_entry_to() 1346 1347 1348 // Search constant pool search_cp for an entry that matches this 1349 // constant pool's entry at pattern_i. Returns the index of a 1350 // matching entry or zero (0) if there is no matching entry. 1351 int ConstantPool::find_matching_entry(int pattern_i, 1352 const constantPoolHandle& search_cp, TRAPS) { 1353 1354 // index zero (0) is not used 1355 for (int i = 1; i < search_cp->length(); i++) { 1356 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); 1357 if (found) { 1358 return i; 1359 } 1360 } 1361 1362 return 0; // entry not found; return unused index zero (0) 1363 } // end find_matching_entry() 1364 1365 1366 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool 1367 // cp2's bootstrap specifier at idx2. 1368 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) { 1369 int k1 = operand_bootstrap_method_ref_index_at(idx1); 1370 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); 1371 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1372 1373 if (!match) { 1374 return false; 1375 } 1376 int argc = operand_argument_count_at(idx1); 1377 if (argc == cp2->operand_argument_count_at(idx2)) { 1378 for (int j = 0; j < argc; j++) { 1379 k1 = operand_argument_index_at(idx1, j); 1380 k2 = cp2->operand_argument_index_at(idx2, j); 1381 match = compare_entry_to(k1, cp2, k2, CHECK_false); 1382 if (!match) { 1383 return false; 1384 } 1385 } 1386 return true; // got through loop; all elements equal 1387 } 1388 return false; 1389 } // end compare_operand_to() 1390 1391 // Search constant pool search_cp for a bootstrap specifier that matches 1392 // this constant pool's bootstrap specifier at pattern_i index. 1393 // Return the index of a matching bootstrap specifier or (-1) if there is no match. 1394 int ConstantPool::find_matching_operand(int pattern_i, 1395 const constantPoolHandle& search_cp, int search_len, TRAPS) { 1396 for (int i = 0; i < search_len; i++) { 1397 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); 1398 if (found) { 1399 return i; 1400 } 1401 } 1402 return -1; // bootstrap specifier not found; return unused index (-1) 1403 } // end find_matching_operand() 1404 1405 1406 #ifndef PRODUCT 1407 1408 const char* ConstantPool::printable_name_at(int which) { 1409 1410 constantTag tag = tag_at(which); 1411 1412 if (tag.is_string()) { 1413 return string_at_noresolve(which); 1414 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 1415 return klass_name_at(which)->as_C_string(); 1416 } else if (tag.is_symbol()) { 1417 return symbol_at(which)->as_C_string(); 1418 } 1419 return ""; 1420 } 1421 1422 #endif // PRODUCT 1423 1424 1425 // JVMTI GetConstantPool support 1426 1427 // For debugging of constant pool 1428 const bool debug_cpool = false; 1429 1430 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) 1431 1432 static void print_cpool_bytes(jint cnt, u1 *bytes) { 1433 const char* WARN_MSG = "Must not be such entry!"; 1434 jint size = 0; 1435 u2 idx1, idx2; 1436 1437 for (jint idx = 1; idx < cnt; idx++) { 1438 jint ent_size = 0; 1439 u1 tag = *bytes++; 1440 size++; // count tag 1441 1442 printf("const #%03d, tag: %02d ", idx, tag); 1443 switch(tag) { 1444 case JVM_CONSTANT_Invalid: { 1445 printf("Invalid"); 1446 break; 1447 } 1448 case JVM_CONSTANT_Unicode: { 1449 printf("Unicode %s", WARN_MSG); 1450 break; 1451 } 1452 case JVM_CONSTANT_Utf8: { 1453 u2 len = Bytes::get_Java_u2(bytes); 1454 char str[128]; 1455 if (len > 127) { 1456 len = 127; 1457 } 1458 strncpy(str, (char *) (bytes+2), len); 1459 str[len] = '\0'; 1460 printf("Utf8 \"%s\"", str); 1461 ent_size = 2 + len; 1462 break; 1463 } 1464 case JVM_CONSTANT_Integer: { 1465 u4 val = Bytes::get_Java_u4(bytes); 1466 printf("int %d", *(int *) &val); 1467 ent_size = 4; 1468 break; 1469 } 1470 case JVM_CONSTANT_Float: { 1471 u4 val = Bytes::get_Java_u4(bytes); 1472 printf("float %5.3ff", *(float *) &val); 1473 ent_size = 4; 1474 break; 1475 } 1476 case JVM_CONSTANT_Long: { 1477 u8 val = Bytes::get_Java_u8(bytes); 1478 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val); 1479 ent_size = 8; 1480 idx++; // Long takes two cpool slots 1481 break; 1482 } 1483 case JVM_CONSTANT_Double: { 1484 u8 val = Bytes::get_Java_u8(bytes); 1485 printf("double %5.3fd", *(jdouble *)&val); 1486 ent_size = 8; 1487 idx++; // Double takes two cpool slots 1488 break; 1489 } 1490 case JVM_CONSTANT_Class: { 1491 idx1 = Bytes::get_Java_u2(bytes); 1492 printf("class #%03d", idx1); 1493 ent_size = 2; 1494 break; 1495 } 1496 case JVM_CONSTANT_String: { 1497 idx1 = Bytes::get_Java_u2(bytes); 1498 printf("String #%03d", idx1); 1499 ent_size = 2; 1500 break; 1501 } 1502 case JVM_CONSTANT_Fieldref: { 1503 idx1 = Bytes::get_Java_u2(bytes); 1504 idx2 = Bytes::get_Java_u2(bytes+2); 1505 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); 1506 ent_size = 4; 1507 break; 1508 } 1509 case JVM_CONSTANT_Methodref: { 1510 idx1 = Bytes::get_Java_u2(bytes); 1511 idx2 = Bytes::get_Java_u2(bytes+2); 1512 printf("Method #%03d, #%03d", idx1, idx2); 1513 ent_size = 4; 1514 break; 1515 } 1516 case JVM_CONSTANT_InterfaceMethodref: { 1517 idx1 = Bytes::get_Java_u2(bytes); 1518 idx2 = Bytes::get_Java_u2(bytes+2); 1519 printf("InterfMethod #%03d, #%03d", idx1, idx2); 1520 ent_size = 4; 1521 break; 1522 } 1523 case JVM_CONSTANT_NameAndType: { 1524 idx1 = Bytes::get_Java_u2(bytes); 1525 idx2 = Bytes::get_Java_u2(bytes+2); 1526 printf("NameAndType #%03d, #%03d", idx1, idx2); 1527 ent_size = 4; 1528 break; 1529 } 1530 case JVM_CONSTANT_ClassIndex: { 1531 printf("ClassIndex %s", WARN_MSG); 1532 break; 1533 } 1534 case JVM_CONSTANT_UnresolvedClass: { 1535 printf("UnresolvedClass: %s", WARN_MSG); 1536 break; 1537 } 1538 case JVM_CONSTANT_UnresolvedClassInError: { 1539 printf("UnresolvedClassInErr: %s", WARN_MSG); 1540 break; 1541 } 1542 case JVM_CONSTANT_StringIndex: { 1543 printf("StringIndex: %s", WARN_MSG); 1544 break; 1545 } 1546 } 1547 printf(";\n"); 1548 bytes += ent_size; 1549 size += ent_size; 1550 } 1551 printf("Cpool size: %d\n", size); 1552 fflush(0); 1553 return; 1554 } /* end print_cpool_bytes */ 1555 1556 1557 // Returns size of constant pool entry. 1558 jint ConstantPool::cpool_entry_size(jint idx) { 1559 switch(tag_at(idx).value()) { 1560 case JVM_CONSTANT_Invalid: 1561 case JVM_CONSTANT_Unicode: 1562 return 1; 1563 1564 case JVM_CONSTANT_Utf8: 1565 return 3 + symbol_at(idx)->utf8_length(); 1566 1567 case JVM_CONSTANT_Class: 1568 case JVM_CONSTANT_String: 1569 case JVM_CONSTANT_ClassIndex: 1570 case JVM_CONSTANT_UnresolvedClass: 1571 case JVM_CONSTANT_UnresolvedClassInError: 1572 case JVM_CONSTANT_StringIndex: 1573 case JVM_CONSTANT_MethodType: 1574 case JVM_CONSTANT_MethodTypeInError: 1575 return 3; 1576 1577 case JVM_CONSTANT_MethodHandle: 1578 case JVM_CONSTANT_MethodHandleInError: 1579 return 4; //tag, ref_kind, ref_index 1580 1581 case JVM_CONSTANT_Integer: 1582 case JVM_CONSTANT_Float: 1583 case JVM_CONSTANT_Fieldref: 1584 case JVM_CONSTANT_Methodref: 1585 case JVM_CONSTANT_InterfaceMethodref: 1586 case JVM_CONSTANT_NameAndType: 1587 return 5; 1588 1589 case JVM_CONSTANT_InvokeDynamic: 1590 // u1 tag, u2 bsm, u2 nt 1591 return 5; 1592 1593 case JVM_CONSTANT_Long: 1594 case JVM_CONSTANT_Double: 1595 return 9; 1596 } 1597 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); 1598 return 1; 1599 } /* end cpool_entry_size */ 1600 1601 1602 // SymbolHashMap is used to find a constant pool index from a string. 1603 // This function fills in SymbolHashMaps, one for utf8s and one for 1604 // class names, returns size of the cpool raw bytes. 1605 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, 1606 SymbolHashMap *classmap) { 1607 jint size = 0; 1608 1609 for (u2 idx = 1; idx < length(); idx++) { 1610 u2 tag = tag_at(idx).value(); 1611 size += cpool_entry_size(idx); 1612 1613 switch(tag) { 1614 case JVM_CONSTANT_Utf8: { 1615 Symbol* sym = symbol_at(idx); 1616 symmap->add_entry(sym, idx); 1617 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); 1618 break; 1619 } 1620 case JVM_CONSTANT_Class: 1621 case JVM_CONSTANT_UnresolvedClass: 1622 case JVM_CONSTANT_UnresolvedClassInError: { 1623 Symbol* sym = klass_name_at(idx); 1624 classmap->add_entry(sym, idx); 1625 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); 1626 break; 1627 } 1628 case JVM_CONSTANT_Long: 1629 case JVM_CONSTANT_Double: { 1630 idx++; // Both Long and Double take two cpool slots 1631 break; 1632 } 1633 } 1634 } 1635 return size; 1636 } /* end hash_utf8_entries_to */ 1637 1638 1639 // Copy cpool bytes. 1640 // Returns: 1641 // 0, in case of OutOfMemoryError 1642 // -1, in case of internal error 1643 // > 0, count of the raw cpool bytes that have been copied 1644 int ConstantPool::copy_cpool_bytes(int cpool_size, 1645 SymbolHashMap* tbl, 1646 unsigned char *bytes) { 1647 u2 idx1, idx2; 1648 jint size = 0; 1649 jint cnt = length(); 1650 unsigned char *start_bytes = bytes; 1651 1652 for (jint idx = 1; idx < cnt; idx++) { 1653 u1 tag = tag_at(idx).value(); 1654 jint ent_size = cpool_entry_size(idx); 1655 1656 assert(size + ent_size <= cpool_size, "Size mismatch"); 1657 1658 *bytes = tag; 1659 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); 1660 switch(tag) { 1661 case JVM_CONSTANT_Invalid: { 1662 DBG(printf("JVM_CONSTANT_Invalid")); 1663 break; 1664 } 1665 case JVM_CONSTANT_Unicode: { 1666 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); 1667 DBG(printf("JVM_CONSTANT_Unicode")); 1668 break; 1669 } 1670 case JVM_CONSTANT_Utf8: { 1671 Symbol* sym = symbol_at(idx); 1672 char* str = sym->as_utf8(); 1673 // Warning! It's crashing on x86 with len = sym->utf8_length() 1674 int len = (int) strlen(str); 1675 Bytes::put_Java_u2((address) (bytes+1), (u2) len); 1676 for (int i = 0; i < len; i++) { 1677 bytes[3+i] = (u1) str[i]; 1678 } 1679 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); 1680 break; 1681 } 1682 case JVM_CONSTANT_Integer: { 1683 jint val = int_at(idx); 1684 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1685 break; 1686 } 1687 case JVM_CONSTANT_Float: { 1688 jfloat val = float_at(idx); 1689 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1690 break; 1691 } 1692 case JVM_CONSTANT_Long: { 1693 jlong val = long_at(idx); 1694 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1695 idx++; // Long takes two cpool slots 1696 break; 1697 } 1698 case JVM_CONSTANT_Double: { 1699 jdouble val = double_at(idx); 1700 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1701 idx++; // Double takes two cpool slots 1702 break; 1703 } 1704 case JVM_CONSTANT_Class: 1705 case JVM_CONSTANT_UnresolvedClass: 1706 case JVM_CONSTANT_UnresolvedClassInError: { 1707 *bytes = JVM_CONSTANT_Class; 1708 Symbol* sym = klass_name_at(idx); 1709 idx1 = tbl->symbol_to_value(sym); 1710 assert(idx1 != 0, "Have not found a hashtable entry"); 1711 Bytes::put_Java_u2((address) (bytes+1), idx1); 1712 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); 1713 break; 1714 } 1715 case JVM_CONSTANT_String: { 1716 *bytes = JVM_CONSTANT_String; 1717 Symbol* sym = unresolved_string_at(idx); 1718 idx1 = tbl->symbol_to_value(sym); 1719 assert(idx1 != 0, "Have not found a hashtable entry"); 1720 Bytes::put_Java_u2((address) (bytes+1), idx1); 1721 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); 1722 break; 1723 } 1724 case JVM_CONSTANT_Fieldref: 1725 case JVM_CONSTANT_Methodref: 1726 case JVM_CONSTANT_InterfaceMethodref: { 1727 idx1 = uncached_klass_ref_index_at(idx); 1728 idx2 = uncached_name_and_type_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_Methodref: %hd %hd", idx1, idx2)); 1732 break; 1733 } 1734 case JVM_CONSTANT_NameAndType: { 1735 idx1 = name_ref_index_at(idx); 1736 idx2 = signature_ref_index_at(idx); 1737 Bytes::put_Java_u2((address) (bytes+1), idx1); 1738 Bytes::put_Java_u2((address) (bytes+3), idx2); 1739 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); 1740 break; 1741 } 1742 case JVM_CONSTANT_ClassIndex: { 1743 *bytes = JVM_CONSTANT_Class; 1744 idx1 = klass_index_at(idx); 1745 Bytes::put_Java_u2((address) (bytes+1), idx1); 1746 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); 1747 break; 1748 } 1749 case JVM_CONSTANT_StringIndex: { 1750 *bytes = JVM_CONSTANT_String; 1751 idx1 = string_index_at(idx); 1752 Bytes::put_Java_u2((address) (bytes+1), idx1); 1753 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); 1754 break; 1755 } 1756 case JVM_CONSTANT_MethodHandle: 1757 case JVM_CONSTANT_MethodHandleInError: { 1758 *bytes = JVM_CONSTANT_MethodHandle; 1759 int kind = method_handle_ref_kind_at(idx); 1760 idx1 = method_handle_index_at(idx); 1761 *(bytes+1) = (unsigned char) kind; 1762 Bytes::put_Java_u2((address) (bytes+2), idx1); 1763 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); 1764 break; 1765 } 1766 case JVM_CONSTANT_MethodType: 1767 case JVM_CONSTANT_MethodTypeInError: { 1768 *bytes = JVM_CONSTANT_MethodType; 1769 idx1 = method_type_index_at(idx); 1770 Bytes::put_Java_u2((address) (bytes+1), idx1); 1771 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); 1772 break; 1773 } 1774 case JVM_CONSTANT_InvokeDynamic: { 1775 *bytes = tag; 1776 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 1777 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 1778 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); 1779 Bytes::put_Java_u2((address) (bytes+1), idx1); 1780 Bytes::put_Java_u2((address) (bytes+3), idx2); 1781 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); 1782 break; 1783 } 1784 } 1785 DBG(printf("\n")); 1786 bytes += ent_size; 1787 size += ent_size; 1788 } 1789 assert(size == cpool_size, "Size mismatch"); 1790 1791 // Keep temorarily for debugging until it's stable. 1792 DBG(print_cpool_bytes(cnt, start_bytes)); 1793 return (int)(bytes - start_bytes); 1794 } /* end copy_cpool_bytes */ 1795 1796 #undef DBG 1797 1798 1799 void ConstantPool::set_on_stack(const bool value) { 1800 if (value) { 1801 // Only record if it's not already set. 1802 if (!on_stack()) { 1803 _flags |= _on_stack; 1804 MetadataOnStackMark::record(this); 1805 } 1806 } else { 1807 // Clearing is done single-threadedly. 1808 _flags &= ~_on_stack; 1809 } 1810 } 1811 1812 // JSR 292 support for patching constant pool oops after the class is linked and 1813 // the oop array for resolved references are created. 1814 // We can't do this during classfile parsing, which is how the other indexes are 1815 // patched. The other patches are applied early for some error checking 1816 // so only defer the pseudo_strings. 1817 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) { 1818 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused 1819 Handle patch = cp_patches->at(index); 1820 if (patch.not_null()) { 1821 assert (tag_at(index).is_string(), "should only be string left"); 1822 // Patching a string means pre-resolving it. 1823 // The spelling in the constant pool is ignored. 1824 // The constant reference may be any object whatever. 1825 // If it is not a real interned string, the constant is referred 1826 // to as a "pseudo-string", and must be presented to the CP 1827 // explicitly, because it may require scavenging. 1828 int obj_index = cp_to_object_index(index); 1829 pseudo_string_at_put(index, obj_index, patch()); 1830 DEBUG_ONLY(cp_patches->at_put(index, Handle());) 1831 } 1832 } 1833 #ifdef ASSERT 1834 // Ensure that all the patches have been used. 1835 for (int index = 0; index < cp_patches->length(); index++) { 1836 assert(cp_patches->at(index).is_null(), 1837 "Unused constant pool patch at %d in class file %s", 1838 index, 1839 pool_holder()->external_name()); 1840 } 1841 #endif // ASSERT 1842 } 1843 1844 #ifndef PRODUCT 1845 1846 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool 1847 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { 1848 guarantee(obj->is_constantPool(), "object must be constant pool"); 1849 constantPoolHandle cp(THREAD, (ConstantPool*)obj); 1850 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); 1851 1852 for (int i = 0; i< cp->length(); i++) { 1853 if (cp->tag_at(i).is_unresolved_klass()) { 1854 // This will force loading of the class 1855 Klass* klass = cp->klass_at(i, CHECK); 1856 if (klass->is_instance_klass()) { 1857 // Force initialization of class 1858 InstanceKlass::cast(klass)->initialize(CHECK); 1859 } 1860 } 1861 } 1862 } 1863 1864 #endif 1865 1866 1867 // Printing 1868 1869 void ConstantPool::print_on(outputStream* st) const { 1870 assert(is_constantPool(), "must be constantPool"); 1871 st->print_cr("%s", internal_name()); 1872 if (flags() != 0) { 1873 st->print(" - flags: 0x%x", flags()); 1874 if (has_preresolution()) st->print(" has_preresolution"); 1875 if (on_stack()) st->print(" on_stack"); 1876 st->cr(); 1877 } 1878 if (pool_holder() != NULL) { 1879 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder())); 1880 } 1881 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache())); 1882 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references())); 1883 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map())); 1884 1885 for (int index = 1; index < length(); index++) { // Index 0 is unused 1886 ((ConstantPool*)this)->print_entry_on(index, st); 1887 switch (tag_at(index).value()) { 1888 case JVM_CONSTANT_Long : 1889 case JVM_CONSTANT_Double : 1890 index++; // Skip entry following eigth-byte constant 1891 } 1892 1893 } 1894 st->cr(); 1895 } 1896 1897 // Print one constant pool entry 1898 void ConstantPool::print_entry_on(const int index, outputStream* st) { 1899 EXCEPTION_MARK; 1900 st->print(" - %3d : ", index); 1901 tag_at(index).print_on(st); 1902 st->print(" : "); 1903 switch (tag_at(index).value()) { 1904 case JVM_CONSTANT_Class : 1905 { Klass* k = klass_at(index, CATCH); 1906 guarantee(k != NULL, "need klass"); 1907 k->print_value_on(st); 1908 st->print(" {" PTR_FORMAT "}", p2i(k)); 1909 } 1910 break; 1911 case JVM_CONSTANT_Fieldref : 1912 case JVM_CONSTANT_Methodref : 1913 case JVM_CONSTANT_InterfaceMethodref : 1914 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); 1915 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); 1916 break; 1917 case JVM_CONSTANT_String : 1918 if (is_pseudo_string_at(index)) { 1919 oop anObj = pseudo_string_at(index); 1920 anObj->print_value_on(st); 1921 st->print(" {" PTR_FORMAT "}", p2i(anObj)); 1922 } else { 1923 unresolved_string_at(index)->print_value_on(st); 1924 } 1925 break; 1926 case JVM_CONSTANT_Integer : 1927 st->print("%d", int_at(index)); 1928 break; 1929 case JVM_CONSTANT_Float : 1930 st->print("%f", float_at(index)); 1931 break; 1932 case JVM_CONSTANT_Long : 1933 st->print_jlong(long_at(index)); 1934 break; 1935 case JVM_CONSTANT_Double : 1936 st->print("%lf", double_at(index)); 1937 break; 1938 case JVM_CONSTANT_NameAndType : 1939 st->print("name_index=%d", name_ref_index_at(index)); 1940 st->print(" signature_index=%d", signature_ref_index_at(index)); 1941 break; 1942 case JVM_CONSTANT_Utf8 : 1943 symbol_at(index)->print_value_on(st); 1944 break; 1945 case JVM_CONSTANT_UnresolvedClass : // fall-through 1946 case JVM_CONSTANT_UnresolvedClassInError: { 1947 CPSlot entry = slot_at(index); 1948 if (entry.is_resolved()) { 1949 entry.get_klass()->print_value_on(st); 1950 } else { 1951 entry.get_symbol()->print_value_on(st); 1952 } 1953 } 1954 break; 1955 case JVM_CONSTANT_MethodHandle : 1956 case JVM_CONSTANT_MethodHandleInError : 1957 st->print("ref_kind=%d", method_handle_ref_kind_at(index)); 1958 st->print(" ref_index=%d", method_handle_index_at(index)); 1959 break; 1960 case JVM_CONSTANT_MethodType : 1961 case JVM_CONSTANT_MethodTypeInError : 1962 st->print("signature_index=%d", method_type_index_at(index)); 1963 break; 1964 case JVM_CONSTANT_InvokeDynamic : 1965 { 1966 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); 1967 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); 1968 int argc = invoke_dynamic_argument_count_at(index); 1969 if (argc > 0) { 1970 for (int arg_i = 0; arg_i < argc; arg_i++) { 1971 int arg = invoke_dynamic_argument_index_at(index, arg_i); 1972 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 1973 } 1974 st->print("}"); 1975 } 1976 } 1977 break; 1978 default: 1979 ShouldNotReachHere(); 1980 break; 1981 } 1982 st->cr(); 1983 } 1984 1985 void ConstantPool::print_value_on(outputStream* st) const { 1986 assert(is_constantPool(), "must be constantPool"); 1987 st->print("constant pool [%d]", length()); 1988 if (has_preresolution()) st->print("/preresolution"); 1989 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); 1990 print_address_on(st); 1991 st->print(" for "); 1992 pool_holder()->print_value_on(st); 1993 if (pool_holder() != NULL) { 1994 bool extra = (pool_holder()->constants() != this); 1995 if (extra) st->print(" (extra)"); 1996 } 1997 if (cache() != NULL) { 1998 st->print(" cache=" PTR_FORMAT, p2i(cache())); 1999 } 2000 } 2001 2002 #if INCLUDE_SERVICES 2003 // Size Statistics 2004 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { 2005 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); 2006 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); 2007 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); 2008 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); 2009 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); 2010 2011 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + 2012 sz->_cp_refmap_bytes; 2013 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; 2014 } 2015 #endif // INCLUDE_SERVICES 2016 2017 // Verification 2018 2019 void ConstantPool::verify_on(outputStream* st) { 2020 guarantee(is_constantPool(), "object must be constant pool"); 2021 for (int i = 0; i< length(); i++) { 2022 constantTag tag = tag_at(i); 2023 CPSlot entry = slot_at(i); 2024 if (tag.is_klass()) { 2025 if (entry.is_resolved()) { 2026 guarantee(entry.get_klass()->is_klass(), "should be klass"); 2027 } 2028 } else if (tag.is_unresolved_klass()) { 2029 if (entry.is_resolved()) { 2030 guarantee(entry.get_klass()->is_klass(), "should be klass"); 2031 } 2032 } else if (tag.is_symbol()) { 2033 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2034 } else if (tag.is_string()) { 2035 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2036 } 2037 } 2038 if (cache() != NULL) { 2039 // Note: cache() can be NULL before a class is completely setup or 2040 // in temporary constant pools used during constant pool merging 2041 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); 2042 } 2043 if (pool_holder() != NULL) { 2044 // Note: pool_holder() can be NULL in temporary constant pools 2045 // used during constant pool merging 2046 guarantee(pool_holder()->is_klass(), "should be klass"); 2047 } 2048 } 2049 2050 2051 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { 2052 char *str = sym->as_utf8(); 2053 unsigned int hash = compute_hash(str, sym->utf8_length()); 2054 unsigned int index = hash % table_size(); 2055 2056 // check if already in map 2057 // we prefer the first entry since it is more likely to be what was used in 2058 // the class file 2059 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2060 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2061 if (en->hash() == hash && en->symbol() == sym) { 2062 return; // already there 2063 } 2064 } 2065 2066 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); 2067 entry->set_next(bucket(index)); 2068 _buckets[index].set_entry(entry); 2069 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2070 } 2071 2072 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { 2073 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); 2074 char *str = sym->as_utf8(); 2075 int len = sym->utf8_length(); 2076 unsigned int hash = SymbolHashMap::compute_hash(str, len); 2077 unsigned int index = hash % table_size(); 2078 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2079 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2080 if (en->hash() == hash && en->symbol() == sym) { 2081 return en; 2082 } 2083 } 2084 return NULL; 2085 }