1 /* 2 * Copyright (c) 1997, 2014, 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/vframe.hpp" 44 45 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { 46 // Tags are RW but comment below applies to tags also. 47 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); 48 49 int size = ConstantPool::size(length); 50 51 // CDS considerations: 52 // Allocate read-write but may be able to move to read-only at dumping time 53 // if all the klasses are resolved. The only other field that is writable is 54 // the resolved_references array, which is recreated at startup time. 55 // But that could be moved to InstanceKlass (although a pain to access from 56 // assembly code). Maybe it could be moved to the cpCache which is RW. 57 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); 58 } 59 60 ConstantPool::ConstantPool(Array<u1>* tags) { 61 set_length(tags->length()); 62 set_tags(NULL); 63 set_cache(NULL); 64 set_reference_map(NULL); 65 set_resolved_references(NULL); 66 set_operands(NULL); 67 set_pool_holder(NULL); 68 set_flags(0); 69 70 // only set to non-zero if constant pool is merged by RedefineClasses 71 set_version(0); 72 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock")); 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<u2>(loader_data, reference_map()); 86 set_reference_map(NULL); 87 88 MetadataFactory::free_array<jushort>(loader_data, operands()); 89 set_operands(NULL); 90 91 release_C_heap_structures(); 92 93 // free tag array 94 MetadataFactory::free_array<u1>(loader_data, tags()); 95 set_tags(NULL); 96 } 97 98 void ConstantPool::release_C_heap_structures() { 99 // walk constant pool and decrement symbol reference counts 100 unreference_symbols(); 101 102 delete _lock; 103 set_lock(NULL); 104 } 105 106 objArrayOop ConstantPool::resolved_references() const { 107 return (objArrayOop)JNIHandles::resolve(_resolved_references); 108 } 109 110 // Create resolved_references array and mapping array for original cp indexes 111 // The ldc bytecode was rewritten to have the resolved reference array index so need a way 112 // to map it back for resolving and some unlikely miscellaneous uses. 113 // The objects created by invokedynamic are appended to this list. 114 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, 115 intStack reference_map, 116 int constant_pool_map_length, 117 TRAPS) { 118 // Initialized the resolved object cache. 119 int map_length = reference_map.length(); 120 if (map_length > 0) { 121 // Only need mapping back to constant pool entries. The map isn't used for 122 // invokedynamic resolved_reference entries. For invokedynamic entries, 123 // the constant pool cache index has the mapping back to both the constant 124 // pool and to the resolved reference index. 125 if (constant_pool_map_length > 0) { 126 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK); 127 128 for (int i = 0; i < constant_pool_map_length; i++) { 129 int x = reference_map.at(i); 130 assert(x == (int)(jushort) x, "klass index is too big"); 131 om->at_put(i, (jushort)x); 132 } 133 set_reference_map(om); 134 } 135 136 // Create Java array for holding resolved strings, methodHandles, 137 // methodTypes, invokedynamic and invokehandle appendix objects, etc. 138 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 139 Handle refs_handle (THREAD, (oop)stom); // must handleize. 140 set_resolved_references(loader_data->add_handle(refs_handle)); 141 } 142 } 143 144 // CDS support. Create a new resolved_references array. 145 void ConstantPool::restore_unshareable_info(TRAPS) { 146 147 // Only create the new resolved references array and lock if it hasn't been 148 // attempted before 149 if (resolved_references() != NULL) return; 150 151 // restore the C++ vtable from the shared archive 152 restore_vtable(); 153 154 if (SystemDictionary::Object_klass_loaded()) { 155 // Recreate the object array and add to ClassLoaderData. 156 int map_length = resolved_reference_length(); 157 if (map_length > 0) { 158 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 159 Handle refs_handle (THREAD, (oop)stom); // must handleize. 160 161 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 162 set_resolved_references(loader_data->add_handle(refs_handle)); 163 } 164 165 // Also need to recreate the mutex. Make sure this matches the constructor 166 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock")); 167 } 168 } 169 170 void ConstantPool::remove_unshareable_info() { 171 // Resolved references are not in the shared archive. 172 // Save the length for restoration. It is not necessarily the same length 173 // as reference_map.length() if invokedynamic is saved. 174 set_resolved_reference_length( 175 resolved_references() != NULL ? resolved_references()->length() : 0); 176 set_resolved_references(NULL); 177 set_lock(NULL); 178 } 179 180 int ConstantPool::cp_to_object_index(int cp_index) { 181 // this is harder don't do this so much. 182 int i = reference_map()->find(cp_index); 183 // We might not find the index for jsr292 call. 184 return (i < 0) ? _no_index_sentinel : i; 185 } 186 187 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_cp, int which, TRAPS) { 188 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 189 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and 190 // tag is not updated atomicly. 191 192 CPSlot entry = this_cp->slot_at(which); 193 if (entry.is_resolved()) { 194 assert(entry.get_klass()->is_klass(), "must be"); 195 // Already resolved - return entry. 196 return entry.get_klass(); 197 } 198 199 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object 200 // already has updated the object 201 assert(THREAD->is_Java_thread(), "must be a Java thread"); 202 bool do_resolve = false; 203 bool in_error = false; 204 205 // Create a handle for the mirror. This will preserve the resolved class 206 // until the loader_data is registered. 207 Handle mirror_handle; 208 209 Symbol* name = NULL; 210 Handle loader; 211 { MonitorLockerEx ml(this_cp->lock()); 212 213 if (this_cp->tag_at(which).is_unresolved_klass()) { 214 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) { 215 in_error = true; 216 } else { 217 do_resolve = true; 218 name = this_cp->unresolved_klass_at(which); 219 loader = Handle(THREAD, this_cp->pool_holder()->class_loader()); 220 } 221 } 222 } // unlocking constantPool 223 224 225 // The original attempt to resolve this constant pool entry failed so find the 226 // original error and throw it again (JVMS 5.4.3). 227 if (in_error) { 228 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which); 229 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); 230 ResourceMark rm; 231 // exception text will be the class name 232 const char* className = this_cp->unresolved_klass_at(which)->as_C_string(); 233 THROW_MSG_0(error, className); 234 } 235 236 if (do_resolve) { 237 // this_cp must be unlocked during resolve_or_fail 238 oop protection_domain = this_cp->pool_holder()->protection_domain(); 239 Handle h_prot (THREAD, protection_domain); 240 Klass* kk = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD); 241 KlassHandle k; 242 if (!HAS_PENDING_EXCEPTION) { 243 k = KlassHandle(THREAD, kk); 244 // preserve the resolved klass. 245 mirror_handle = Handle(THREAD, kk->java_mirror()); 246 // Do access check for klasses 247 verify_constant_pool_resolve(this_cp, k, THREAD); 248 } 249 250 // Failed to resolve class. We must record the errors so that subsequent attempts 251 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). 252 if (HAS_PENDING_EXCEPTION) { 253 ResourceMark rm; 254 Symbol* error = PENDING_EXCEPTION->klass()->name(); 255 256 bool throw_orig_error = false; 257 { 258 MonitorLockerEx ml(this_cp->lock()); 259 260 // some other thread has beaten us and has resolved the class. 261 if (this_cp->tag_at(which).is_klass()) { 262 CLEAR_PENDING_EXCEPTION; 263 entry = this_cp->resolved_klass_at(which); 264 return entry.get_klass(); 265 } 266 267 if (!PENDING_EXCEPTION-> 268 is_a(SystemDictionary::LinkageError_klass())) { 269 // Just throw the exception and don't prevent these classes from 270 // being loaded due to virtual machine errors like StackOverflow 271 // and OutOfMemoryError, etc, or if the thread was hit by stop() 272 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 273 } 274 else if (!this_cp->tag_at(which).is_unresolved_klass_in_error()) { 275 SystemDictionary::add_resolution_error(this_cp, which, error); 276 this_cp->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError); 277 } else { 278 // some other thread has put the class in error state. 279 error = SystemDictionary::find_resolution_error(this_cp, which); 280 assert(error != NULL, "checking"); 281 throw_orig_error = true; 282 } 283 } // unlocked 284 285 if (throw_orig_error) { 286 CLEAR_PENDING_EXCEPTION; 287 ResourceMark rm; 288 const char* className = this_cp->unresolved_klass_at(which)->as_C_string(); 289 THROW_MSG_0(error, className); 290 } 291 292 return 0; 293 } 294 295 if (TraceClassResolution && !k()->oop_is_array()) { 296 // skip resolving the constant pool so that this code get's 297 // called the next time some bytecodes refer to this class. 298 ResourceMark rm; 299 int line_number = -1; 300 const char * source_file = NULL; 301 if (JavaThread::current()->has_last_Java_frame()) { 302 // try to identify the method which called this function. 303 vframeStream vfst(JavaThread::current()); 304 if (!vfst.at_end()) { 305 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 306 Symbol* s = vfst.method()->method_holder()->source_file_name(); 307 if (s != NULL) { 308 source_file = s->as_C_string(); 309 } 310 } 311 } 312 if (k() != this_cp->pool_holder()) { 313 // only print something if the classes are different 314 if (source_file != NULL) { 315 tty->print("RESOLVE %s %s %s:%d\n", 316 this_cp->pool_holder()->external_name(), 317 InstanceKlass::cast(k())->external_name(), source_file, line_number); 318 } else { 319 tty->print("RESOLVE %s %s\n", 320 this_cp->pool_holder()->external_name(), 321 InstanceKlass::cast(k())->external_name()); 322 } 323 } 324 return k(); 325 } else { 326 MonitorLockerEx ml(this_cp->lock()); 327 // Only updated constant pool - if it is resolved. 328 do_resolve = this_cp->tag_at(which).is_unresolved_klass(); 329 if (do_resolve) { 330 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data(); 331 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM 332 this_cp->klass_at_put(which, k()); 333 } 334 } 335 } 336 337 entry = this_cp->resolved_klass_at(which); 338 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); 339 return entry.get_klass(); 340 } 341 342 343 // Does not update ConstantPool* - to avoid any exception throwing. Used 344 // by compiler and exception handling. Also used to avoid classloads for 345 // instanceof operations. Returns NULL if the class has not been loaded or 346 // if the verification of constant pool failed 347 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_cp, int which) { 348 CPSlot entry = this_cp->slot_at(which); 349 if (entry.is_resolved()) { 350 assert(entry.get_klass()->is_klass(), "must be"); 351 return entry.get_klass(); 352 } else { 353 assert(entry.is_unresolved(), "must be either symbol or klass"); 354 Thread *thread = Thread::current(); 355 Symbol* name = entry.get_symbol(); 356 oop loader = this_cp->pool_holder()->class_loader(); 357 oop protection_domain = this_cp->pool_holder()->protection_domain(); 358 Handle h_prot (thread, protection_domain); 359 Handle h_loader (thread, loader); 360 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); 361 362 if (k != NULL) { 363 // Make sure that resolving is legal 364 EXCEPTION_MARK; 365 KlassHandle klass(THREAD, k); 366 // return NULL if verification fails 367 verify_constant_pool_resolve(this_cp, klass, THREAD); 368 if (HAS_PENDING_EXCEPTION) { 369 CLEAR_PENDING_EXCEPTION; 370 return NULL; 371 } 372 return klass(); 373 } else { 374 return k; 375 } 376 } 377 } 378 379 380 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_cp, int which) { 381 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which)); 382 } 383 384 385 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool, 386 int which) { 387 if (cpool->cache() == NULL) return NULL; // nothing to load yet 388 int cache_index = decode_cpcache_index(which, true); 389 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { 390 // FIXME: should be an assert 391 if (PrintMiscellaneous && (Verbose||WizardMode)) { 392 tty->print_cr("bad operand %d in:", which); cpool->print(); 393 } 394 return NULL; 395 } 396 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 397 return e->method_if_resolved(cpool); 398 } 399 400 401 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) { 402 if (cpool->cache() == NULL) return false; // nothing to load yet 403 int cache_index = decode_cpcache_index(which, true); 404 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 405 return e->has_appendix(); 406 } 407 408 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) { 409 if (cpool->cache() == NULL) return NULL; // nothing to load yet 410 int cache_index = decode_cpcache_index(which, true); 411 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 412 return e->appendix_if_resolved(cpool); 413 } 414 415 416 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) { 417 if (cpool->cache() == NULL) return false; // nothing to load yet 418 int cache_index = decode_cpcache_index(which, true); 419 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 420 return e->has_method_type(); 421 } 422 423 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) { 424 if (cpool->cache() == NULL) return NULL; // nothing to load yet 425 int cache_index = decode_cpcache_index(which, true); 426 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 427 return e->method_type_if_resolved(cpool); 428 } 429 430 431 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { 432 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 433 return symbol_at(name_index); 434 } 435 436 437 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { 438 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 439 return symbol_at(signature_index); 440 } 441 442 443 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { 444 int i = which; 445 if (!uncached && cache() != NULL) { 446 if (ConstantPool::is_invokedynamic_index(which)) { 447 // Invokedynamic index is index into resolved_references 448 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); 449 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); 450 assert(tag_at(pool_index).is_name_and_type(), ""); 451 return pool_index; 452 } 453 // change byte-ordering and go via cache 454 i = remap_instruction_operand_from_cache(which); 455 } else { 456 if (tag_at(which).is_invoke_dynamic()) { 457 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); 458 assert(tag_at(pool_index).is_name_and_type(), ""); 459 return pool_index; 460 } 461 } 462 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 463 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); 464 jint ref_index = *int_at_addr(i); 465 return extract_high_short_from_int(ref_index); 466 } 467 468 469 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { 470 guarantee(!ConstantPool::is_invokedynamic_index(which), 471 "an invokedynamic instruction does not have a klass"); 472 int i = which; 473 if (!uncached && cache() != NULL) { 474 // change byte-ordering and go via cache 475 i = remap_instruction_operand_from_cache(which); 476 } 477 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 478 jint ref_index = *int_at_addr(i); 479 return extract_low_short_from_int(ref_index); 480 } 481 482 483 484 int ConstantPool::remap_instruction_operand_from_cache(int operand) { 485 int cpc_index = operand; 486 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); 487 assert((int)(u2)cpc_index == cpc_index, "clean u2"); 488 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); 489 return member_index; 490 } 491 492 493 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_cp, KlassHandle k, TRAPS) { 494 if (k->oop_is_instance() || k->oop_is_objArray()) { 495 instanceKlassHandle holder (THREAD, this_cp->pool_holder()); 496 Klass* elem = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); 497 KlassHandle element (THREAD, elem); 498 499 // The element type could be a typeArray - we only need the access check if it is 500 // an reference to another class 501 if (element->oop_is_instance()) { 502 LinkResolver::check_klass_accessability(holder, element, CHECK); 503 } 504 } 505 } 506 507 508 int ConstantPool::name_ref_index_at(int which_nt) { 509 jint ref_index = name_and_type_at(which_nt); 510 return extract_low_short_from_int(ref_index); 511 } 512 513 514 int ConstantPool::signature_ref_index_at(int which_nt) { 515 jint ref_index = name_and_type_at(which_nt); 516 return extract_high_short_from_int(ref_index); 517 } 518 519 520 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { 521 return klass_at(klass_ref_index_at(which), CHECK_NULL); 522 } 523 524 525 Symbol* ConstantPool::klass_name_at(int which) { 526 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), 527 "Corrupted constant pool"); 528 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 529 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and 530 // tag is not updated atomicly. 531 CPSlot entry = slot_at(which); 532 if (entry.is_resolved()) { 533 // Already resolved - return entry's name. 534 assert(entry.get_klass()->is_klass(), "must be"); 535 return entry.get_klass()->name(); 536 } else { 537 assert(entry.is_unresolved(), "must be either symbol or klass"); 538 return entry.get_symbol(); 539 } 540 } 541 542 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { 543 jint ref_index = klass_ref_index_at(which); 544 return klass_at_noresolve(ref_index); 545 } 546 547 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { 548 jint ref_index = uncached_klass_ref_index_at(which); 549 return klass_at_noresolve(ref_index); 550 } 551 552 char* ConstantPool::string_at_noresolve(int which) { 553 Symbol* s = unresolved_string_at(which); 554 if (s == NULL) { 555 return (char*)"<pseudo-string>"; 556 } else { 557 return unresolved_string_at(which)->as_C_string(); 558 } 559 } 560 561 BasicType ConstantPool::basic_type_for_signature_at(int which) { 562 return FieldType::basic_type(symbol_at(which)); 563 } 564 565 566 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_cp, TRAPS) { 567 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused 568 if (this_cp->tag_at(index).is_string()) { 569 this_cp->string_at(index, CHECK); 570 } 571 } 572 } 573 574 // Resolve all the classes in the constant pool. If they are all resolved, 575 // the constant pool is read-only. Enhancement: allocate cp entries to 576 // another metaspace, and copy to read-only or read-write space if this 577 // bit is set. 578 bool ConstantPool::resolve_class_constants(TRAPS) { 579 constantPoolHandle cp(THREAD, this); 580 for (int index = 1; index < length(); index++) { // Index 0 is unused 581 if (tag_at(index).is_unresolved_klass() && 582 klass_at_if_loaded(cp, index) == NULL) { 583 return false; 584 } 585 } 586 // set_preresolution(); or some bit for future use 587 return true; 588 } 589 590 // If resolution for MethodHandle or MethodType fails, save the exception 591 // in the resolution error table, so that the same exception is thrown again. 592 void ConstantPool::save_and_throw_exception(constantPoolHandle this_cp, int which, 593 int tag, TRAPS) { 594 ResourceMark rm; 595 Symbol* error = PENDING_EXCEPTION->klass()->name(); 596 MonitorLockerEx ml(this_cp->lock()); // lock cpool to change tag. 597 598 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ? 599 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError; 600 601 if (!PENDING_EXCEPTION-> 602 is_a(SystemDictionary::LinkageError_klass())) { 603 // Just throw the exception and don't prevent these classes from 604 // being loaded due to virtual machine errors like StackOverflow 605 // and OutOfMemoryError, etc, or if the thread was hit by stop() 606 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 607 608 } else if (this_cp->tag_at(which).value() != error_tag) { 609 SystemDictionary::add_resolution_error(this_cp, which, error); 610 this_cp->tag_at_put(which, error_tag); 611 } else { 612 // some other thread has put the class in error state. 613 error = SystemDictionary::find_resolution_error(this_cp, which); 614 assert(error != NULL, "checking"); 615 CLEAR_PENDING_EXCEPTION; 616 THROW_MSG(error, ""); 617 } 618 } 619 620 621 // Called to resolve constants in the constant pool and return an oop. 622 // Some constant pool entries cache their resolved oop. This is also 623 // called to create oops from constants to use in arguments for invokedynamic 624 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_cp, int index, int cache_index, TRAPS) { 625 oop result_oop = NULL; 626 Handle throw_exception; 627 628 if (cache_index == _possible_index_sentinel) { 629 // It is possible that this constant is one which is cached in the objects. 630 // We'll do a linear search. This should be OK because this usage is rare. 631 assert(index > 0, "valid index"); 632 cache_index = this_cp->cp_to_object_index(index); 633 } 634 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); 635 assert(index == _no_index_sentinel || index >= 0, ""); 636 637 if (cache_index >= 0) { 638 result_oop = this_cp->resolved_references()->obj_at(cache_index); 639 if (result_oop != NULL) { 640 return result_oop; 641 // That was easy... 642 } 643 index = this_cp->object_to_cp_index(cache_index); 644 } 645 646 jvalue prim_value; // temp used only in a few cases below 647 648 int tag_value = this_cp->tag_at(index).value(); 649 650 switch (tag_value) { 651 652 case JVM_CONSTANT_UnresolvedClass: 653 case JVM_CONSTANT_UnresolvedClassInError: 654 case JVM_CONSTANT_Class: 655 { 656 assert(cache_index == _no_index_sentinel, "should not have been set"); 657 Klass* resolved = klass_at_impl(this_cp, index, CHECK_NULL); 658 // ldc wants the java mirror. 659 result_oop = resolved->java_mirror(); 660 break; 661 } 662 663 case JVM_CONSTANT_String: 664 assert(cache_index != _no_index_sentinel, "should have been set"); 665 if (this_cp->is_pseudo_string_at(index)) { 666 result_oop = this_cp->pseudo_string_at(index, cache_index); 667 break; 668 } 669 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL); 670 break; 671 672 case JVM_CONSTANT_MethodHandleInError: 673 case JVM_CONSTANT_MethodTypeInError: 674 { 675 Symbol* error = SystemDictionary::find_resolution_error(this_cp, index); 676 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); 677 ResourceMark rm; 678 THROW_MSG_0(error, ""); 679 break; 680 } 681 682 case JVM_CONSTANT_MethodHandle: 683 { 684 int ref_kind = this_cp->method_handle_ref_kind_at(index); 685 int callee_index = this_cp->method_handle_klass_index_at(index); 686 Symbol* name = this_cp->method_handle_name_ref_at(index); 687 Symbol* signature = this_cp->method_handle_signature_ref_at(index); 688 if (PrintMiscellaneous) 689 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", 690 ref_kind, index, this_cp->method_handle_index_at(index), 691 callee_index, name->as_C_string(), signature->as_C_string()); 692 KlassHandle callee; 693 { Klass* k = klass_at_impl(this_cp, callee_index, CHECK_NULL); 694 callee = KlassHandle(THREAD, k); 695 } 696 KlassHandle klass(THREAD, this_cp->pool_holder()); 697 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, 698 callee, name, signature, 699 THREAD); 700 result_oop = value(); 701 if (HAS_PENDING_EXCEPTION) { 702 save_and_throw_exception(this_cp, index, tag_value, CHECK_NULL); 703 } 704 break; 705 } 706 707 case JVM_CONSTANT_MethodType: 708 { 709 Symbol* signature = this_cp->method_type_signature_at(index); 710 if (PrintMiscellaneous) 711 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", 712 index, this_cp->method_type_index_at(index), 713 signature->as_C_string()); 714 KlassHandle klass(THREAD, this_cp->pool_holder()); 715 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); 716 result_oop = value(); 717 if (HAS_PENDING_EXCEPTION) { 718 save_and_throw_exception(this_cp, index, tag_value, CHECK_NULL); 719 } 720 break; 721 } 722 723 case JVM_CONSTANT_Integer: 724 assert(cache_index == _no_index_sentinel, "should not have been set"); 725 prim_value.i = this_cp->int_at(index); 726 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); 727 break; 728 729 case JVM_CONSTANT_Float: 730 assert(cache_index == _no_index_sentinel, "should not have been set"); 731 prim_value.f = this_cp->float_at(index); 732 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); 733 break; 734 735 case JVM_CONSTANT_Long: 736 assert(cache_index == _no_index_sentinel, "should not have been set"); 737 prim_value.j = this_cp->long_at(index); 738 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); 739 break; 740 741 case JVM_CONSTANT_Double: 742 assert(cache_index == _no_index_sentinel, "should not have been set"); 743 prim_value.d = this_cp->double_at(index); 744 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); 745 break; 746 747 default: 748 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", 749 this_cp(), index, cache_index, tag_value) ); 750 assert(false, "unexpected constant tag"); 751 break; 752 } 753 754 if (cache_index >= 0) { 755 // Cache the oop here also. 756 Handle result_handle(THREAD, result_oop); 757 MonitorLockerEx ml(this_cp->lock()); // don't know if we really need this 758 oop result = this_cp->resolved_references()->obj_at(cache_index); 759 // Benign race condition: resolved_references may already be filled in while we were trying to lock. 760 // The important thing here is that all threads pick up the same result. 761 // It doesn't matter which racing thread wins, as long as only one 762 // result is used by all threads, and all future queries. 763 // That result may be either a resolved constant or a failure exception. 764 if (result == NULL) { 765 this_cp->resolved_references()->obj_at_put(cache_index, result_handle()); 766 return result_handle(); 767 } else { 768 // Return the winning thread's result. This can be different than 769 // result_handle() for MethodHandles. 770 return result; 771 } 772 } else { 773 return result_oop; 774 } 775 } 776 777 oop ConstantPool::uncached_string_at(int which, TRAPS) { 778 Symbol* sym = unresolved_string_at(which); 779 oop str = StringTable::intern(sym, CHECK_(NULL)); 780 assert(java_lang_String::is_instance(str), "must be string"); 781 return str; 782 } 783 784 785 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_cp, int index, TRAPS) { 786 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); 787 788 Handle bsm; 789 int argc; 790 { 791 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments 792 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. 793 // It is accompanied by the optional arguments. 794 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index); 795 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); 796 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { 797 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); 798 } 799 800 // Extract the optional static arguments. 801 argc = this_cp->invoke_dynamic_argument_count_at(index); 802 if (argc == 0) return bsm_oop; 803 804 bsm = Handle(THREAD, bsm_oop); 805 } 806 807 objArrayHandle info; 808 { 809 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); 810 info = objArrayHandle(THREAD, info_oop); 811 } 812 813 info->obj_at_put(0, bsm()); 814 for (int i = 0; i < argc; i++) { 815 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i); 816 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); 817 info->obj_at_put(1+i, arg_oop); 818 } 819 820 return info(); 821 } 822 823 oop ConstantPool::string_at_impl(constantPoolHandle this_cp, int which, int obj_index, TRAPS) { 824 // If the string has already been interned, this entry will be non-null 825 oop str = this_cp->resolved_references()->obj_at(obj_index); 826 if (str != NULL) return str; 827 Symbol* sym = this_cp->unresolved_string_at(which); 828 str = StringTable::intern(sym, CHECK_(NULL)); 829 this_cp->string_at_put(which, obj_index, str); 830 assert(java_lang_String::is_instance(str), "must be string"); 831 return str; 832 } 833 834 835 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, 836 int which) { 837 // Names are interned, so we can compare Symbol*s directly 838 Symbol* cp_name = klass_name_at(which); 839 return (cp_name == k->name()); 840 } 841 842 843 // Iterate over symbols and decrement ones which are Symbol*s. 844 // This is done during GC so do not need to lock constantPool unless we 845 // have per-thread safepoints. 846 // Only decrement the UTF8 symbols. Unresolved classes and strings point to 847 // these symbols but didn't increment the reference count. 848 void ConstantPool::unreference_symbols() { 849 for (int index = 1; index < length(); index++) { // Index 0 is unused 850 constantTag tag = tag_at(index); 851 if (tag.is_symbol()) { 852 symbol_at(index)->decrement_refcount(); 853 } 854 } 855 } 856 857 858 // Compare this constant pool's entry at index1 to the constant pool 859 // cp2's entry at index2. 860 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2, 861 int index2, TRAPS) { 862 863 // The error tags are equivalent to non-error tags when comparing 864 jbyte t1 = tag_at(index1).non_error_value(); 865 jbyte t2 = cp2->tag_at(index2).non_error_value(); 866 867 if (t1 != t2) { 868 // Not the same entry type so there is nothing else to check. Note 869 // that this style of checking will consider resolved/unresolved 870 // class pairs as different. 871 // From the ConstantPool* API point of view, this is correct 872 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this 873 // plays out in the context of ConstantPool* merging. 874 return false; 875 } 876 877 switch (t1) { 878 case JVM_CONSTANT_Class: 879 { 880 Klass* k1 = klass_at(index1, CHECK_false); 881 Klass* k2 = cp2->klass_at(index2, CHECK_false); 882 if (k1 == k2) { 883 return true; 884 } 885 } break; 886 887 case JVM_CONSTANT_ClassIndex: 888 { 889 int recur1 = klass_index_at(index1); 890 int recur2 = cp2->klass_index_at(index2); 891 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 892 if (match) { 893 return true; 894 } 895 } break; 896 897 case JVM_CONSTANT_Double: 898 { 899 jdouble d1 = double_at(index1); 900 jdouble d2 = cp2->double_at(index2); 901 if (d1 == d2) { 902 return true; 903 } 904 } break; 905 906 case JVM_CONSTANT_Fieldref: 907 case JVM_CONSTANT_InterfaceMethodref: 908 case JVM_CONSTANT_Methodref: 909 { 910 int recur1 = uncached_klass_ref_index_at(index1); 911 int recur2 = cp2->uncached_klass_ref_index_at(index2); 912 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 913 if (match) { 914 recur1 = uncached_name_and_type_ref_index_at(index1); 915 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); 916 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 917 if (match) { 918 return true; 919 } 920 } 921 } break; 922 923 case JVM_CONSTANT_Float: 924 { 925 jfloat f1 = float_at(index1); 926 jfloat f2 = cp2->float_at(index2); 927 if (f1 == f2) { 928 return true; 929 } 930 } break; 931 932 case JVM_CONSTANT_Integer: 933 { 934 jint i1 = int_at(index1); 935 jint i2 = cp2->int_at(index2); 936 if (i1 == i2) { 937 return true; 938 } 939 } break; 940 941 case JVM_CONSTANT_Long: 942 { 943 jlong l1 = long_at(index1); 944 jlong l2 = cp2->long_at(index2); 945 if (l1 == l2) { 946 return true; 947 } 948 } break; 949 950 case JVM_CONSTANT_NameAndType: 951 { 952 int recur1 = name_ref_index_at(index1); 953 int recur2 = cp2->name_ref_index_at(index2); 954 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 955 if (match) { 956 recur1 = signature_ref_index_at(index1); 957 recur2 = cp2->signature_ref_index_at(index2); 958 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 959 if (match) { 960 return true; 961 } 962 } 963 } break; 964 965 case JVM_CONSTANT_StringIndex: 966 { 967 int recur1 = string_index_at(index1); 968 int recur2 = cp2->string_index_at(index2); 969 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 970 if (match) { 971 return true; 972 } 973 } break; 974 975 case JVM_CONSTANT_UnresolvedClass: 976 { 977 Symbol* k1 = unresolved_klass_at(index1); 978 Symbol* k2 = cp2->unresolved_klass_at(index2); 979 if (k1 == k2) { 980 return true; 981 } 982 } break; 983 984 case JVM_CONSTANT_MethodType: 985 { 986 int k1 = method_type_index_at_error_ok(index1); 987 int k2 = cp2->method_type_index_at_error_ok(index2); 988 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 989 if (match) { 990 return true; 991 } 992 } break; 993 994 case JVM_CONSTANT_MethodHandle: 995 { 996 int k1 = method_handle_ref_kind_at_error_ok(index1); 997 int k2 = cp2->method_handle_ref_kind_at_error_ok(index2); 998 if (k1 == k2) { 999 int i1 = method_handle_index_at_error_ok(index1); 1000 int i2 = cp2->method_handle_index_at_error_ok(index2); 1001 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); 1002 if (match) { 1003 return true; 1004 } 1005 } 1006 } break; 1007 1008 case JVM_CONSTANT_InvokeDynamic: 1009 { 1010 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); 1011 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); 1012 int i1 = invoke_dynamic_bootstrap_specifier_index(index1); 1013 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); 1014 // separate statements and variables because CHECK_false is used 1015 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); 1016 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); 1017 return (match_entry && match_operand); 1018 } break; 1019 1020 case JVM_CONSTANT_String: 1021 { 1022 Symbol* s1 = unresolved_string_at(index1); 1023 Symbol* s2 = cp2->unresolved_string_at(index2); 1024 if (s1 == s2) { 1025 return true; 1026 } 1027 } break; 1028 1029 case JVM_CONSTANT_Utf8: 1030 { 1031 Symbol* s1 = symbol_at(index1); 1032 Symbol* s2 = cp2->symbol_at(index2); 1033 if (s1 == s2) { 1034 return true; 1035 } 1036 } break; 1037 1038 // Invalid is used as the tag for the second constant pool entry 1039 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1040 // not be seen by itself. 1041 case JVM_CONSTANT_Invalid: // fall through 1042 1043 default: 1044 ShouldNotReachHere(); 1045 break; 1046 } 1047 1048 return false; 1049 } // end compare_entry_to() 1050 1051 1052 // Resize the operands array with delta_len and delta_size. 1053 // Used in RedefineClasses for CP merge. 1054 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { 1055 int old_len = operand_array_length(operands()); 1056 int new_len = old_len + delta_len; 1057 int min_len = (delta_len > 0) ? old_len : new_len; 1058 1059 int old_size = operands()->length(); 1060 int new_size = old_size + delta_size; 1061 int min_size = (delta_size > 0) ? old_size : new_size; 1062 1063 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1064 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); 1065 1066 // Set index in the resized array for existing elements only 1067 for (int idx = 0; idx < min_len; idx++) { 1068 int offset = operand_offset_at(idx); // offset in original array 1069 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array 1070 } 1071 // Copy the bootstrap specifiers only 1072 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), 1073 new_ops->adr_at(2*new_len), 1074 (min_size - 2*min_len) * sizeof(u2)); 1075 // Explicitly deallocate old operands array. 1076 // Note, it is not needed for 7u backport. 1077 if ( operands() != NULL) { // the safety check 1078 MetadataFactory::free_array<u2>(loader_data, operands()); 1079 } 1080 set_operands(new_ops); 1081 } // end resize_operands() 1082 1083 1084 // Extend the operands array with the length and size of the ext_cp operands. 1085 // Used in RedefineClasses for CP merge. 1086 void ConstantPool::extend_operands(constantPoolHandle ext_cp, TRAPS) { 1087 int delta_len = operand_array_length(ext_cp->operands()); 1088 if (delta_len == 0) { 1089 return; // nothing to do 1090 } 1091 int delta_size = ext_cp->operands()->length(); 1092 1093 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); 1094 1095 if (operand_array_length(operands()) == 0) { 1096 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1097 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); 1098 // The first element index defines the offset of second part 1099 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array 1100 set_operands(new_ops); 1101 } else { 1102 resize_operands(delta_len, delta_size, CHECK); 1103 } 1104 1105 } // end extend_operands() 1106 1107 1108 // Shrink the operands array to a smaller array with new_len length. 1109 // Used in RedefineClasses for CP merge. 1110 void ConstantPool::shrink_operands(int new_len, TRAPS) { 1111 int old_len = operand_array_length(operands()); 1112 if (new_len == old_len) { 1113 return; // nothing to do 1114 } 1115 assert(new_len < old_len, "shrunken operands array must be smaller"); 1116 1117 int free_base = operand_next_offset_at(new_len - 1); 1118 int delta_len = new_len - old_len; 1119 int delta_size = 2*delta_len + free_base - operands()->length(); 1120 1121 resize_operands(delta_len, delta_size, CHECK); 1122 1123 } // end shrink_operands() 1124 1125 1126 void ConstantPool::copy_operands(constantPoolHandle from_cp, 1127 constantPoolHandle to_cp, 1128 TRAPS) { 1129 1130 int from_oplen = operand_array_length(from_cp->operands()); 1131 int old_oplen = operand_array_length(to_cp->operands()); 1132 if (from_oplen != 0) { 1133 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); 1134 // append my operands to the target's operands array 1135 if (old_oplen == 0) { 1136 // Can't just reuse from_cp's operand list because of deallocation issues 1137 int len = from_cp->operands()->length(); 1138 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); 1139 Copy::conjoint_memory_atomic( 1140 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); 1141 to_cp->set_operands(new_ops); 1142 } else { 1143 int old_len = to_cp->operands()->length(); 1144 int from_len = from_cp->operands()->length(); 1145 int old_off = old_oplen * sizeof(u2); 1146 int from_off = from_oplen * sizeof(u2); 1147 // Use the metaspace for the destination constant pool 1148 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); 1149 int fillp = 0, len = 0; 1150 // first part of dest 1151 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), 1152 new_operands->adr_at(fillp), 1153 (len = old_off) * sizeof(u2)); 1154 fillp += len; 1155 // first part of src 1156 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), 1157 new_operands->adr_at(fillp), 1158 (len = from_off) * sizeof(u2)); 1159 fillp += len; 1160 // second part of dest 1161 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), 1162 new_operands->adr_at(fillp), 1163 (len = old_len - old_off) * sizeof(u2)); 1164 fillp += len; 1165 // second part of src 1166 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), 1167 new_operands->adr_at(fillp), 1168 (len = from_len - from_off) * sizeof(u2)); 1169 fillp += len; 1170 assert(fillp == new_operands->length(), ""); 1171 1172 // Adjust indexes in the first part of the copied operands array. 1173 for (int j = 0; j < from_oplen; j++) { 1174 int offset = operand_offset_at(new_operands, old_oplen + j); 1175 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); 1176 offset += old_len; // every new tuple is preceded by old_len extra u2's 1177 operand_offset_at_put(new_operands, old_oplen + j, offset); 1178 } 1179 1180 // replace target operands array with combined array 1181 to_cp->set_operands(new_operands); 1182 } 1183 } 1184 } // end copy_operands() 1185 1186 1187 // Copy this constant pool's entries at start_i to end_i (inclusive) 1188 // to the constant pool to_cp's entries starting at to_i. A total of 1189 // (end_i - start_i) + 1 entries are copied. 1190 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, 1191 constantPoolHandle to_cp, int to_i, TRAPS) { 1192 1193 1194 int dest_i = to_i; // leave original alone for debug purposes 1195 1196 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { 1197 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); 1198 1199 switch (from_cp->tag_at(src_i).value()) { 1200 case JVM_CONSTANT_Double: 1201 case JVM_CONSTANT_Long: 1202 // double and long take two constant pool entries 1203 src_i += 2; 1204 dest_i += 2; 1205 break; 1206 1207 default: 1208 // all others take one constant pool entry 1209 src_i++; 1210 dest_i++; 1211 break; 1212 } 1213 } 1214 copy_operands(from_cp, to_cp, CHECK); 1215 1216 } // end copy_cp_to_impl() 1217 1218 1219 // Copy this constant pool's entry at from_i to the constant pool 1220 // to_cp's entry at to_i. 1221 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i, 1222 constantPoolHandle to_cp, int to_i, 1223 TRAPS) { 1224 1225 int tag = from_cp->tag_at(from_i).value(); 1226 switch (tag) { 1227 case JVM_CONSTANT_Class: 1228 { 1229 Klass* k = from_cp->klass_at(from_i, CHECK); 1230 to_cp->klass_at_put(to_i, k); 1231 } break; 1232 1233 case JVM_CONSTANT_ClassIndex: 1234 { 1235 jint ki = from_cp->klass_index_at(from_i); 1236 to_cp->klass_index_at_put(to_i, ki); 1237 } break; 1238 1239 case JVM_CONSTANT_Double: 1240 { 1241 jdouble d = from_cp->double_at(from_i); 1242 to_cp->double_at_put(to_i, d); 1243 // double takes two constant pool entries so init second entry's tag 1244 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1245 } break; 1246 1247 case JVM_CONSTANT_Fieldref: 1248 { 1249 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1250 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1251 to_cp->field_at_put(to_i, class_index, name_and_type_index); 1252 } break; 1253 1254 case JVM_CONSTANT_Float: 1255 { 1256 jfloat f = from_cp->float_at(from_i); 1257 to_cp->float_at_put(to_i, f); 1258 } break; 1259 1260 case JVM_CONSTANT_Integer: 1261 { 1262 jint i = from_cp->int_at(from_i); 1263 to_cp->int_at_put(to_i, i); 1264 } break; 1265 1266 case JVM_CONSTANT_InterfaceMethodref: 1267 { 1268 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1269 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1270 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); 1271 } break; 1272 1273 case JVM_CONSTANT_Long: 1274 { 1275 jlong l = from_cp->long_at(from_i); 1276 to_cp->long_at_put(to_i, l); 1277 // long takes two constant pool entries so init second entry's tag 1278 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1279 } break; 1280 1281 case JVM_CONSTANT_Methodref: 1282 { 1283 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1284 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1285 to_cp->method_at_put(to_i, class_index, name_and_type_index); 1286 } break; 1287 1288 case JVM_CONSTANT_NameAndType: 1289 { 1290 int name_ref_index = from_cp->name_ref_index_at(from_i); 1291 int signature_ref_index = from_cp->signature_ref_index_at(from_i); 1292 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); 1293 } break; 1294 1295 case JVM_CONSTANT_StringIndex: 1296 { 1297 jint si = from_cp->string_index_at(from_i); 1298 to_cp->string_index_at_put(to_i, si); 1299 } break; 1300 1301 case JVM_CONSTANT_UnresolvedClass: 1302 case JVM_CONSTANT_UnresolvedClassInError: 1303 { 1304 // Can be resolved after checking tag, so check the slot first. 1305 CPSlot entry = from_cp->slot_at(from_i); 1306 if (entry.is_resolved()) { 1307 assert(entry.get_klass()->is_klass(), "must be"); 1308 // Already resolved 1309 to_cp->klass_at_put(to_i, entry.get_klass()); 1310 } else { 1311 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); 1312 } 1313 } break; 1314 1315 case JVM_CONSTANT_String: 1316 { 1317 Symbol* s = from_cp->unresolved_string_at(from_i); 1318 to_cp->unresolved_string_at_put(to_i, s); 1319 } break; 1320 1321 case JVM_CONSTANT_Utf8: 1322 { 1323 Symbol* s = from_cp->symbol_at(from_i); 1324 // Need to increase refcount, the old one will be thrown away and deferenced 1325 s->increment_refcount(); 1326 to_cp->symbol_at_put(to_i, s); 1327 } break; 1328 1329 case JVM_CONSTANT_MethodType: 1330 case JVM_CONSTANT_MethodTypeInError: 1331 { 1332 jint k = from_cp->method_type_index_at_error_ok(from_i); 1333 to_cp->method_type_index_at_put(to_i, k); 1334 } break; 1335 1336 case JVM_CONSTANT_MethodHandle: 1337 case JVM_CONSTANT_MethodHandleInError: 1338 { 1339 int k1 = from_cp->method_handle_ref_kind_at_error_ok(from_i); 1340 int k2 = from_cp->method_handle_index_at_error_ok(from_i); 1341 to_cp->method_handle_index_at_put(to_i, k1, k2); 1342 } break; 1343 1344 case JVM_CONSTANT_InvokeDynamic: 1345 { 1346 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); 1347 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); 1348 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1349 to_cp->invoke_dynamic_at_put(to_i, k1, k2); 1350 } break; 1351 1352 // Invalid is used as the tag for the second constant pool entry 1353 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1354 // not be seen by itself. 1355 case JVM_CONSTANT_Invalid: // fall through 1356 1357 default: 1358 { 1359 ShouldNotReachHere(); 1360 } break; 1361 } 1362 } // end copy_entry_to() 1363 1364 1365 // Search constant pool search_cp for an entry that matches this 1366 // constant pool's entry at pattern_i. Returns the index of a 1367 // matching entry or zero (0) if there is no matching entry. 1368 int ConstantPool::find_matching_entry(int pattern_i, 1369 constantPoolHandle search_cp, TRAPS) { 1370 1371 // index zero (0) is not used 1372 for (int i = 1; i < search_cp->length(); i++) { 1373 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); 1374 if (found) { 1375 return i; 1376 } 1377 } 1378 1379 return 0; // entry not found; return unused index zero (0) 1380 } // end find_matching_entry() 1381 1382 1383 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool 1384 // cp2's bootstrap specifier at idx2. 1385 bool ConstantPool::compare_operand_to(int idx1, constantPoolHandle cp2, int idx2, TRAPS) { 1386 int k1 = operand_bootstrap_method_ref_index_at(idx1); 1387 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); 1388 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1389 1390 if (!match) { 1391 return false; 1392 } 1393 int argc = operand_argument_count_at(idx1); 1394 if (argc == cp2->operand_argument_count_at(idx2)) { 1395 for (int j = 0; j < argc; j++) { 1396 k1 = operand_argument_index_at(idx1, j); 1397 k2 = cp2->operand_argument_index_at(idx2, j); 1398 match = compare_entry_to(k1, cp2, k2, CHECK_false); 1399 if (!match) { 1400 return false; 1401 } 1402 } 1403 return true; // got through loop; all elements equal 1404 } 1405 return false; 1406 } // end compare_operand_to() 1407 1408 // Search constant pool search_cp for a bootstrap specifier that matches 1409 // this constant pool's bootstrap specifier at pattern_i index. 1410 // Return the index of a matching bootstrap specifier or (-1) if there is no match. 1411 int ConstantPool::find_matching_operand(int pattern_i, 1412 constantPoolHandle search_cp, int search_len, TRAPS) { 1413 for (int i = 0; i < search_len; i++) { 1414 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); 1415 if (found) { 1416 return i; 1417 } 1418 } 1419 return -1; // bootstrap specifier not found; return unused index (-1) 1420 } // end find_matching_operand() 1421 1422 1423 #ifndef PRODUCT 1424 1425 const char* ConstantPool::printable_name_at(int which) { 1426 1427 constantTag tag = tag_at(which); 1428 1429 if (tag.is_string()) { 1430 return string_at_noresolve(which); 1431 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 1432 return klass_name_at(which)->as_C_string(); 1433 } else if (tag.is_symbol()) { 1434 return symbol_at(which)->as_C_string(); 1435 } 1436 return ""; 1437 } 1438 1439 #endif // PRODUCT 1440 1441 1442 // JVMTI GetConstantPool support 1443 1444 // For debugging of constant pool 1445 const bool debug_cpool = false; 1446 1447 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) 1448 1449 static void print_cpool_bytes(jint cnt, u1 *bytes) { 1450 const char* WARN_MSG = "Must not be such entry!"; 1451 jint size = 0; 1452 u2 idx1, idx2; 1453 1454 for (jint idx = 1; idx < cnt; idx++) { 1455 jint ent_size = 0; 1456 u1 tag = *bytes++; 1457 size++; // count tag 1458 1459 printf("const #%03d, tag: %02d ", idx, tag); 1460 switch(tag) { 1461 case JVM_CONSTANT_Invalid: { 1462 printf("Invalid"); 1463 break; 1464 } 1465 case JVM_CONSTANT_Unicode: { 1466 printf("Unicode %s", WARN_MSG); 1467 break; 1468 } 1469 case JVM_CONSTANT_Utf8: { 1470 u2 len = Bytes::get_Java_u2(bytes); 1471 char str[128]; 1472 if (len > 127) { 1473 len = 127; 1474 } 1475 strncpy(str, (char *) (bytes+2), len); 1476 str[len] = '\0'; 1477 printf("Utf8 \"%s\"", str); 1478 ent_size = 2 + len; 1479 break; 1480 } 1481 case JVM_CONSTANT_Integer: { 1482 u4 val = Bytes::get_Java_u4(bytes); 1483 printf("int %d", *(int *) &val); 1484 ent_size = 4; 1485 break; 1486 } 1487 case JVM_CONSTANT_Float: { 1488 u4 val = Bytes::get_Java_u4(bytes); 1489 printf("float %5.3ff", *(float *) &val); 1490 ent_size = 4; 1491 break; 1492 } 1493 case JVM_CONSTANT_Long: { 1494 u8 val = Bytes::get_Java_u8(bytes); 1495 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val); 1496 ent_size = 8; 1497 idx++; // Long takes two cpool slots 1498 break; 1499 } 1500 case JVM_CONSTANT_Double: { 1501 u8 val = Bytes::get_Java_u8(bytes); 1502 printf("double %5.3fd", *(jdouble *)&val); 1503 ent_size = 8; 1504 idx++; // Double takes two cpool slots 1505 break; 1506 } 1507 case JVM_CONSTANT_Class: { 1508 idx1 = Bytes::get_Java_u2(bytes); 1509 printf("class #%03d", idx1); 1510 ent_size = 2; 1511 break; 1512 } 1513 case JVM_CONSTANT_String: { 1514 idx1 = Bytes::get_Java_u2(bytes); 1515 printf("String #%03d", idx1); 1516 ent_size = 2; 1517 break; 1518 } 1519 case JVM_CONSTANT_Fieldref: { 1520 idx1 = Bytes::get_Java_u2(bytes); 1521 idx2 = Bytes::get_Java_u2(bytes+2); 1522 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); 1523 ent_size = 4; 1524 break; 1525 } 1526 case JVM_CONSTANT_Methodref: { 1527 idx1 = Bytes::get_Java_u2(bytes); 1528 idx2 = Bytes::get_Java_u2(bytes+2); 1529 printf("Method #%03d, #%03d", idx1, idx2); 1530 ent_size = 4; 1531 break; 1532 } 1533 case JVM_CONSTANT_InterfaceMethodref: { 1534 idx1 = Bytes::get_Java_u2(bytes); 1535 idx2 = Bytes::get_Java_u2(bytes+2); 1536 printf("InterfMethod #%03d, #%03d", idx1, idx2); 1537 ent_size = 4; 1538 break; 1539 } 1540 case JVM_CONSTANT_NameAndType: { 1541 idx1 = Bytes::get_Java_u2(bytes); 1542 idx2 = Bytes::get_Java_u2(bytes+2); 1543 printf("NameAndType #%03d, #%03d", idx1, idx2); 1544 ent_size = 4; 1545 break; 1546 } 1547 case JVM_CONSTANT_ClassIndex: { 1548 printf("ClassIndex %s", WARN_MSG); 1549 break; 1550 } 1551 case JVM_CONSTANT_UnresolvedClass: { 1552 printf("UnresolvedClass: %s", WARN_MSG); 1553 break; 1554 } 1555 case JVM_CONSTANT_UnresolvedClassInError: { 1556 printf("UnresolvedClassInErr: %s", WARN_MSG); 1557 break; 1558 } 1559 case JVM_CONSTANT_StringIndex: { 1560 printf("StringIndex: %s", WARN_MSG); 1561 break; 1562 } 1563 } 1564 printf(";\n"); 1565 bytes += ent_size; 1566 size += ent_size; 1567 } 1568 printf("Cpool size: %d\n", size); 1569 fflush(0); 1570 return; 1571 } /* end print_cpool_bytes */ 1572 1573 1574 // Returns size of constant pool entry. 1575 jint ConstantPool::cpool_entry_size(jint idx) { 1576 switch(tag_at(idx).value()) { 1577 case JVM_CONSTANT_Invalid: 1578 case JVM_CONSTANT_Unicode: 1579 return 1; 1580 1581 case JVM_CONSTANT_Utf8: 1582 return 3 + symbol_at(idx)->utf8_length(); 1583 1584 case JVM_CONSTANT_Class: 1585 case JVM_CONSTANT_String: 1586 case JVM_CONSTANT_ClassIndex: 1587 case JVM_CONSTANT_UnresolvedClass: 1588 case JVM_CONSTANT_UnresolvedClassInError: 1589 case JVM_CONSTANT_StringIndex: 1590 case JVM_CONSTANT_MethodType: 1591 case JVM_CONSTANT_MethodTypeInError: 1592 return 3; 1593 1594 case JVM_CONSTANT_MethodHandle: 1595 case JVM_CONSTANT_MethodHandleInError: 1596 return 4; //tag, ref_kind, ref_index 1597 1598 case JVM_CONSTANT_Integer: 1599 case JVM_CONSTANT_Float: 1600 case JVM_CONSTANT_Fieldref: 1601 case JVM_CONSTANT_Methodref: 1602 case JVM_CONSTANT_InterfaceMethodref: 1603 case JVM_CONSTANT_NameAndType: 1604 return 5; 1605 1606 case JVM_CONSTANT_InvokeDynamic: 1607 // u1 tag, u2 bsm, u2 nt 1608 return 5; 1609 1610 case JVM_CONSTANT_Long: 1611 case JVM_CONSTANT_Double: 1612 return 9; 1613 } 1614 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); 1615 return 1; 1616 } /* end cpool_entry_size */ 1617 1618 1619 // SymbolHashMap is used to find a constant pool index from a string. 1620 // This function fills in SymbolHashMaps, one for utf8s and one for 1621 // class names, returns size of the cpool raw bytes. 1622 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, 1623 SymbolHashMap *classmap) { 1624 jint size = 0; 1625 1626 for (u2 idx = 1; idx < length(); idx++) { 1627 u2 tag = tag_at(idx).value(); 1628 size += cpool_entry_size(idx); 1629 1630 switch(tag) { 1631 case JVM_CONSTANT_Utf8: { 1632 Symbol* sym = symbol_at(idx); 1633 symmap->add_entry(sym, idx); 1634 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); 1635 break; 1636 } 1637 case JVM_CONSTANT_Class: 1638 case JVM_CONSTANT_UnresolvedClass: 1639 case JVM_CONSTANT_UnresolvedClassInError: { 1640 Symbol* sym = klass_name_at(idx); 1641 classmap->add_entry(sym, idx); 1642 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); 1643 break; 1644 } 1645 case JVM_CONSTANT_Long: 1646 case JVM_CONSTANT_Double: { 1647 idx++; // Both Long and Double take two cpool slots 1648 break; 1649 } 1650 } 1651 } 1652 return size; 1653 } /* end hash_utf8_entries_to */ 1654 1655 1656 // Copy cpool bytes. 1657 // Returns: 1658 // 0, in case of OutOfMemoryError 1659 // -1, in case of internal error 1660 // > 0, count of the raw cpool bytes that have been copied 1661 int ConstantPool::copy_cpool_bytes(int cpool_size, 1662 SymbolHashMap* tbl, 1663 unsigned char *bytes) { 1664 u2 idx1, idx2; 1665 jint size = 0; 1666 jint cnt = length(); 1667 unsigned char *start_bytes = bytes; 1668 1669 for (jint idx = 1; idx < cnt; idx++) { 1670 u1 tag = tag_at(idx).value(); 1671 jint ent_size = cpool_entry_size(idx); 1672 1673 assert(size + ent_size <= cpool_size, "Size mismatch"); 1674 1675 *bytes = tag; 1676 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); 1677 switch(tag) { 1678 case JVM_CONSTANT_Invalid: { 1679 DBG(printf("JVM_CONSTANT_Invalid")); 1680 break; 1681 } 1682 case JVM_CONSTANT_Unicode: { 1683 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); 1684 DBG(printf("JVM_CONSTANT_Unicode")); 1685 break; 1686 } 1687 case JVM_CONSTANT_Utf8: { 1688 Symbol* sym = symbol_at(idx); 1689 char* str = sym->as_utf8(); 1690 // Warning! It's crashing on x86 with len = sym->utf8_length() 1691 int len = (int) strlen(str); 1692 Bytes::put_Java_u2((address) (bytes+1), (u2) len); 1693 for (int i = 0; i < len; i++) { 1694 bytes[3+i] = (u1) str[i]; 1695 } 1696 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); 1697 break; 1698 } 1699 case JVM_CONSTANT_Integer: { 1700 jint val = int_at(idx); 1701 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1702 break; 1703 } 1704 case JVM_CONSTANT_Float: { 1705 jfloat val = float_at(idx); 1706 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1707 break; 1708 } 1709 case JVM_CONSTANT_Long: { 1710 jlong val = long_at(idx); 1711 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1712 idx++; // Long takes two cpool slots 1713 break; 1714 } 1715 case JVM_CONSTANT_Double: { 1716 jdouble val = double_at(idx); 1717 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1718 idx++; // Double takes two cpool slots 1719 break; 1720 } 1721 case JVM_CONSTANT_Class: 1722 case JVM_CONSTANT_UnresolvedClass: 1723 case JVM_CONSTANT_UnresolvedClassInError: { 1724 *bytes = JVM_CONSTANT_Class; 1725 Symbol* sym = klass_name_at(idx); 1726 idx1 = tbl->symbol_to_value(sym); 1727 assert(idx1 != 0, "Have not found a hashtable entry"); 1728 Bytes::put_Java_u2((address) (bytes+1), idx1); 1729 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); 1730 break; 1731 } 1732 case JVM_CONSTANT_String: { 1733 *bytes = JVM_CONSTANT_String; 1734 Symbol* sym = unresolved_string_at(idx); 1735 idx1 = tbl->symbol_to_value(sym); 1736 assert(idx1 != 0, "Have not found a hashtable entry"); 1737 Bytes::put_Java_u2((address) (bytes+1), idx1); 1738 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); 1739 break; 1740 } 1741 case JVM_CONSTANT_Fieldref: 1742 case JVM_CONSTANT_Methodref: 1743 case JVM_CONSTANT_InterfaceMethodref: { 1744 idx1 = uncached_klass_ref_index_at(idx); 1745 idx2 = uncached_name_and_type_ref_index_at(idx); 1746 Bytes::put_Java_u2((address) (bytes+1), idx1); 1747 Bytes::put_Java_u2((address) (bytes+3), idx2); 1748 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); 1749 break; 1750 } 1751 case JVM_CONSTANT_NameAndType: { 1752 idx1 = name_ref_index_at(idx); 1753 idx2 = signature_ref_index_at(idx); 1754 Bytes::put_Java_u2((address) (bytes+1), idx1); 1755 Bytes::put_Java_u2((address) (bytes+3), idx2); 1756 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); 1757 break; 1758 } 1759 case JVM_CONSTANT_ClassIndex: { 1760 *bytes = JVM_CONSTANT_Class; 1761 idx1 = klass_index_at(idx); 1762 Bytes::put_Java_u2((address) (bytes+1), idx1); 1763 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); 1764 break; 1765 } 1766 case JVM_CONSTANT_StringIndex: { 1767 *bytes = JVM_CONSTANT_String; 1768 idx1 = string_index_at(idx); 1769 Bytes::put_Java_u2((address) (bytes+1), idx1); 1770 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); 1771 break; 1772 } 1773 case JVM_CONSTANT_MethodHandle: 1774 case JVM_CONSTANT_MethodHandleInError: { 1775 *bytes = JVM_CONSTANT_MethodHandle; 1776 int kind = method_handle_ref_kind_at_error_ok(idx); 1777 idx1 = method_handle_index_at_error_ok(idx); 1778 *(bytes+1) = (unsigned char) kind; 1779 Bytes::put_Java_u2((address) (bytes+2), idx1); 1780 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); 1781 break; 1782 } 1783 case JVM_CONSTANT_MethodType: 1784 case JVM_CONSTANT_MethodTypeInError: { 1785 *bytes = JVM_CONSTANT_MethodType; 1786 idx1 = method_type_index_at_error_ok(idx); 1787 Bytes::put_Java_u2((address) (bytes+1), idx1); 1788 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); 1789 break; 1790 } 1791 case JVM_CONSTANT_InvokeDynamic: { 1792 *bytes = tag; 1793 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 1794 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 1795 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); 1796 Bytes::put_Java_u2((address) (bytes+1), idx1); 1797 Bytes::put_Java_u2((address) (bytes+3), idx2); 1798 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); 1799 break; 1800 } 1801 } 1802 DBG(printf("\n")); 1803 bytes += ent_size; 1804 size += ent_size; 1805 } 1806 assert(size == cpool_size, "Size mismatch"); 1807 1808 // Keep temorarily for debugging until it's stable. 1809 DBG(print_cpool_bytes(cnt, start_bytes)); 1810 return (int)(bytes - start_bytes); 1811 } /* end copy_cpool_bytes */ 1812 1813 #undef DBG 1814 1815 1816 void ConstantPool::set_on_stack(const bool value) { 1817 if (value) { 1818 _flags |= _on_stack; 1819 } else { 1820 _flags &= ~_on_stack; 1821 } 1822 if (value) MetadataOnStackMark::record(this); 1823 } 1824 1825 // JSR 292 support for patching constant pool oops after the class is linked and 1826 // the oop array for resolved references are created. 1827 // We can't do this during classfile parsing, which is how the other indexes are 1828 // patched. The other patches are applied early for some error checking 1829 // so only defer the pseudo_strings. 1830 void ConstantPool::patch_resolved_references( 1831 GrowableArray<Handle>* cp_patches) { 1832 assert(EnableInvokeDynamic, ""); 1833 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused 1834 Handle patch = cp_patches->at(index); 1835 if (patch.not_null()) { 1836 assert (tag_at(index).is_string(), "should only be string left"); 1837 // Patching a string means pre-resolving it. 1838 // The spelling in the constant pool is ignored. 1839 // The constant reference may be any object whatever. 1840 // If it is not a real interned string, the constant is referred 1841 // to as a "pseudo-string", and must be presented to the CP 1842 // explicitly, because it may require scavenging. 1843 int obj_index = cp_to_object_index(index); 1844 pseudo_string_at_put(index, obj_index, patch()); 1845 DEBUG_ONLY(cp_patches->at_put(index, Handle());) 1846 } 1847 } 1848 #ifdef ASSERT 1849 // Ensure that all the patches have been used. 1850 for (int index = 0; index < cp_patches->length(); index++) { 1851 assert(cp_patches->at(index).is_null(), 1852 err_msg("Unused constant pool patch at %d in class file %s", 1853 index, 1854 pool_holder()->external_name())); 1855 } 1856 #endif // ASSERT 1857 } 1858 1859 #ifndef PRODUCT 1860 1861 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool 1862 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { 1863 guarantee(obj->is_constantPool(), "object must be constant pool"); 1864 constantPoolHandle cp(THREAD, (ConstantPool*)obj); 1865 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); 1866 1867 for (int i = 0; i< cp->length(); i++) { 1868 if (cp->tag_at(i).is_unresolved_klass()) { 1869 // This will force loading of the class 1870 Klass* klass = cp->klass_at(i, CHECK); 1871 if (klass->oop_is_instance()) { 1872 // Force initialization of class 1873 InstanceKlass::cast(klass)->initialize(CHECK); 1874 } 1875 } 1876 } 1877 } 1878 1879 #endif 1880 1881 1882 // Printing 1883 1884 void ConstantPool::print_on(outputStream* st) const { 1885 assert(is_constantPool(), "must be constantPool"); 1886 st->print_cr(internal_name()); 1887 if (flags() != 0) { 1888 st->print(" - flags: 0x%x", flags()); 1889 if (has_preresolution()) st->print(" has_preresolution"); 1890 if (on_stack()) st->print(" on_stack"); 1891 st->cr(); 1892 } 1893 if (pool_holder() != NULL) { 1894 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder()); 1895 } 1896 st->print_cr(" - cache: " INTPTR_FORMAT, cache()); 1897 st->print_cr(" - resolved_references: " INTPTR_FORMAT, (void *)resolved_references()); 1898 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map()); 1899 1900 for (int index = 1; index < length(); index++) { // Index 0 is unused 1901 ((ConstantPool*)this)->print_entry_on(index, st); 1902 switch (tag_at(index).value()) { 1903 case JVM_CONSTANT_Long : 1904 case JVM_CONSTANT_Double : 1905 index++; // Skip entry following eigth-byte constant 1906 } 1907 1908 } 1909 st->cr(); 1910 } 1911 1912 // Print one constant pool entry 1913 void ConstantPool::print_entry_on(const int index, outputStream* st) { 1914 EXCEPTION_MARK; 1915 st->print(" - %3d : ", index); 1916 tag_at(index).print_on(st); 1917 st->print(" : "); 1918 switch (tag_at(index).value()) { 1919 case JVM_CONSTANT_Class : 1920 { Klass* k = klass_at(index, CATCH); 1921 guarantee(k != NULL, "need klass"); 1922 k->print_value_on(st); 1923 st->print(" {0x%lx}", (address)k); 1924 } 1925 break; 1926 case JVM_CONSTANT_Fieldref : 1927 case JVM_CONSTANT_Methodref : 1928 case JVM_CONSTANT_InterfaceMethodref : 1929 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); 1930 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); 1931 break; 1932 case JVM_CONSTANT_String : 1933 if (is_pseudo_string_at(index)) { 1934 oop anObj = pseudo_string_at(index); 1935 anObj->print_value_on(st); 1936 st->print(" {0x%lx}", (address)anObj); 1937 } else { 1938 unresolved_string_at(index)->print_value_on(st); 1939 } 1940 break; 1941 case JVM_CONSTANT_Integer : 1942 st->print("%d", int_at(index)); 1943 break; 1944 case JVM_CONSTANT_Float : 1945 st->print("%f", float_at(index)); 1946 break; 1947 case JVM_CONSTANT_Long : 1948 st->print_jlong(long_at(index)); 1949 break; 1950 case JVM_CONSTANT_Double : 1951 st->print("%lf", double_at(index)); 1952 break; 1953 case JVM_CONSTANT_NameAndType : 1954 st->print("name_index=%d", name_ref_index_at(index)); 1955 st->print(" signature_index=%d", signature_ref_index_at(index)); 1956 break; 1957 case JVM_CONSTANT_Utf8 : 1958 symbol_at(index)->print_value_on(st); 1959 break; 1960 case JVM_CONSTANT_UnresolvedClass : // fall-through 1961 case JVM_CONSTANT_UnresolvedClassInError: { 1962 // unresolved_klass_at requires lock or safe world. 1963 CPSlot entry = slot_at(index); 1964 if (entry.is_resolved()) { 1965 entry.get_klass()->print_value_on(st); 1966 } else { 1967 entry.get_symbol()->print_value_on(st); 1968 } 1969 } 1970 break; 1971 case JVM_CONSTANT_MethodHandle : 1972 case JVM_CONSTANT_MethodHandleInError : 1973 st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index)); 1974 st->print(" ref_index=%d", method_handle_index_at_error_ok(index)); 1975 break; 1976 case JVM_CONSTANT_MethodType : 1977 case JVM_CONSTANT_MethodTypeInError : 1978 st->print("signature_index=%d", method_type_index_at_error_ok(index)); 1979 break; 1980 case JVM_CONSTANT_InvokeDynamic : 1981 { 1982 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); 1983 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); 1984 int argc = invoke_dynamic_argument_count_at(index); 1985 if (argc > 0) { 1986 for (int arg_i = 0; arg_i < argc; arg_i++) { 1987 int arg = invoke_dynamic_argument_index_at(index, arg_i); 1988 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 1989 } 1990 st->print("}"); 1991 } 1992 } 1993 break; 1994 default: 1995 ShouldNotReachHere(); 1996 break; 1997 } 1998 st->cr(); 1999 } 2000 2001 void ConstantPool::print_value_on(outputStream* st) const { 2002 assert(is_constantPool(), "must be constantPool"); 2003 st->print("constant pool [%d]", length()); 2004 if (has_preresolution()) st->print("/preresolution"); 2005 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); 2006 print_address_on(st); 2007 st->print(" for "); 2008 pool_holder()->print_value_on(st); 2009 if (pool_holder() != NULL) { 2010 bool extra = (pool_holder()->constants() != this); 2011 if (extra) st->print(" (extra)"); 2012 } 2013 if (cache() != NULL) { 2014 st->print(" cache=" PTR_FORMAT, cache()); 2015 } 2016 } 2017 2018 #if INCLUDE_SERVICES 2019 // Size Statistics 2020 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { 2021 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); 2022 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); 2023 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); 2024 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); 2025 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); 2026 2027 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + 2028 sz->_cp_refmap_bytes; 2029 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; 2030 } 2031 #endif // INCLUDE_SERVICES 2032 2033 // Verification 2034 2035 void ConstantPool::verify_on(outputStream* st) { 2036 guarantee(is_constantPool(), "object must be constant pool"); 2037 for (int i = 0; i< length(); i++) { 2038 constantTag tag = tag_at(i); 2039 CPSlot entry = slot_at(i); 2040 if (tag.is_klass()) { 2041 if (entry.is_resolved()) { 2042 guarantee(entry.get_klass()->is_klass(), "should be klass"); 2043 } 2044 } else if (tag.is_unresolved_klass()) { 2045 if (entry.is_resolved()) { 2046 guarantee(entry.get_klass()->is_klass(), "should be klass"); 2047 } 2048 } else if (tag.is_symbol()) { 2049 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2050 } else if (tag.is_string()) { 2051 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2052 } 2053 } 2054 if (cache() != NULL) { 2055 // Note: cache() can be NULL before a class is completely setup or 2056 // in temporary constant pools used during constant pool merging 2057 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); 2058 } 2059 if (pool_holder() != NULL) { 2060 // Note: pool_holder() can be NULL in temporary constant pools 2061 // used during constant pool merging 2062 guarantee(pool_holder()->is_klass(), "should be klass"); 2063 } 2064 } 2065 2066 2067 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { 2068 char *str = sym->as_utf8(); 2069 unsigned int hash = compute_hash(str, sym->utf8_length()); 2070 unsigned int index = hash % table_size(); 2071 2072 // check if already in map 2073 // we prefer the first entry since it is more likely to be what was used in 2074 // the class file 2075 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2076 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2077 if (en->hash() == hash && en->symbol() == sym) { 2078 return; // already there 2079 } 2080 } 2081 2082 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); 2083 entry->set_next(bucket(index)); 2084 _buckets[index].set_entry(entry); 2085 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2086 } 2087 2088 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { 2089 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); 2090 char *str = sym->as_utf8(); 2091 int len = sym->utf8_length(); 2092 unsigned int hash = SymbolHashMap::compute_hash(str, len); 2093 unsigned int index = hash % table_size(); 2094 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2095 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2096 if (en->hash() == hash && en->symbol() == sym) { 2097 return en; 2098 } 2099 } 2100 return NULL; 2101 }