1 /* 2 * Copyright (c) 1997, 2012, 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/symbolTable.hpp" 29 #include "classfile/systemDictionary.hpp" 30 #include "classfile/vmSymbols.hpp" 31 #include "interpreter/linkResolver.hpp" 32 #include "memory/metadataFactory.hpp" 33 #include "memory/oopFactory.hpp" 34 #include "oops/constantPool.hpp" 35 #include "oops/instanceKlass.hpp" 36 #include "oops/objArrayKlass.hpp" 37 #include "prims/jvmtiRedefineClasses.hpp" 38 #include "runtime/fieldType.hpp" 39 #include "runtime/init.hpp" 40 #include "runtime/javaCalls.hpp" 41 #include "runtime/signature.hpp" 42 #include "runtime/vframe.hpp" 43 44 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { 45 // Tags are RW but comment below applies to tags also. 46 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); 47 48 int size = ConstantPool::size(length); 49 50 // CDS considerations: 51 // Allocate read-write but may be able to move to read-only at dumping time 52 // if all the klasses are resolved. The only other field that is writable is 53 // the resolved_references array, which is recreated at startup time. 54 // But that could be moved to InstanceKlass (although a pain to access from 55 // assembly code). Maybe it could be moved to the cpCache which is RW. 56 return new (loader_data, size, false, THREAD) ConstantPool(tags); 57 } 58 59 ConstantPool::ConstantPool(Array<u1>* tags) { 60 set_length(tags->length()); 61 set_tags(NULL); 62 set_cache(NULL); 63 set_reference_map(NULL); 64 set_resolved_references(NULL); 65 set_operands(NULL); 66 set_pool_holder(NULL); 67 set_flags(0); 68 // only set to non-zero if constant pool is merged by RedefineClasses 69 set_orig_length(0); 70 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock")); 71 // all fields are initialized; needed for GC 72 set_on_stack(false); 73 74 // initialize tag array 75 int length = tags->length(); 76 for (int index = 0; index < length; index++) { 77 tags->at_put(index, JVM_CONSTANT_Invalid); 78 } 79 set_tags(tags); 80 } 81 82 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { 83 MetadataFactory::free_metadata(loader_data, cache()); 84 set_cache(NULL); 85 MetadataFactory::free_array<jushort>(loader_data, operands()); 86 set_operands(NULL); 87 88 release_C_heap_structures(); 89 90 // free tag array 91 MetadataFactory::free_array<u1>(loader_data, tags()); 92 set_tags(NULL); 93 } 94 95 void ConstantPool::release_C_heap_structures() { 96 // walk constant pool and decrement symbol reference counts 97 unreference_symbols(); 98 99 delete _lock; 100 set_lock(NULL); 101 } 102 103 void ConstantPool::set_flag_at(FlagBit fb) { 104 const int MAX_STATE_CHANGES = 2; 105 for (int i = MAX_STATE_CHANGES + 10; i > 0; i--) { 106 int oflags = _flags; 107 int nflags = oflags | (1 << (int)fb); 108 if (Atomic::cmpxchg(nflags, &_flags, oflags) == oflags) 109 return; 110 } 111 assert(false, "failed to cmpxchg flags"); 112 _flags |= (1 << (int)fb); // better than nothing 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 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. The constant pool cache index 132 // has the mapping back to both the constant pool and to the resolved 133 // reference index. 134 if (constant_pool_map_length > 0) { 135 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, 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 // restore the C++ vtable from the shared archive 157 restore_vtable(); 158 159 if (SystemDictionary::Object_klass_loaded()) { 160 // Recreate the object array and add to ClassLoaderData. 161 int map_length = resolved_reference_length(); 162 if (map_length > 0) { 163 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 164 Handle refs_handle (THREAD, (oop)stom); // must handleize. 165 166 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 167 set_resolved_references(loader_data->add_handle(refs_handle)); 168 } 169 170 // Also need to recreate the mutex. Make sure this matches the constructor 171 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock")); 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 set_lock(NULL); 183 } 184 185 int ConstantPool::cp_to_object_index(int cp_index) { 186 // this is harder don't do this so much. 187 for (int i = 0; i< reference_map()->length(); i++) { 188 if (reference_map()->at(i) == cp_index) return i; 189 // Zero entry is divider between constant pool indices for strings, 190 // method handles and method types. After that the index is a constant 191 // pool cache index for invokedynamic. Stop when zero (which can never 192 // be a constant pool index) 193 if (reference_map()->at(i) == 0) break; 194 } 195 // We might not find the index. 196 return _no_index_sentinel; 197 } 198 199 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) { 200 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 201 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and 202 // tag is not updated atomicly. 203 204 CPSlot entry = this_oop->slot_at(which); 205 if (entry.is_resolved()) { 206 assert(entry.get_klass()->is_klass(), "must be"); 207 // Already resolved - return entry. 208 return entry.get_klass(); 209 } 210 211 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object 212 // already has updated the object 213 assert(THREAD->is_Java_thread(), "must be a Java thread"); 214 bool do_resolve = false; 215 bool in_error = false; 216 217 // Create a handle for the mirror. This will preserve the resolved class 218 // until the loader_data is registered. 219 Handle mirror_handle; 220 221 Symbol* name = NULL; 222 Handle loader; 223 { MonitorLockerEx ml(this_oop->lock()); 224 225 if (this_oop->tag_at(which).is_unresolved_klass()) { 226 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) { 227 in_error = true; 228 } else { 229 do_resolve = true; 230 name = this_oop->unresolved_klass_at(which); 231 loader = Handle(THREAD, this_oop->pool_holder()->class_loader()); 232 } 233 } 234 } // unlocking constantPool 235 236 237 // The original attempt to resolve this constant pool entry failed so find the 238 // original error and throw it again (JVMS 5.4.3). 239 if (in_error) { 240 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which); 241 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); 242 ResourceMark rm; 243 // exception text will be the class name 244 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); 245 THROW_MSG_0(error, className); 246 } 247 248 if (do_resolve) { 249 // this_oop must be unlocked during resolve_or_fail 250 oop protection_domain = this_oop->pool_holder()->protection_domain(); 251 Handle h_prot (THREAD, protection_domain); 252 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD); 253 KlassHandle k; 254 if (!HAS_PENDING_EXCEPTION) { 255 k = KlassHandle(THREAD, k_oop); 256 // preserve the resolved klass. 257 mirror_handle = Handle(THREAD, k_oop->java_mirror()); 258 // Do access check for klasses 259 verify_constant_pool_resolve(this_oop, k, THREAD); 260 } 261 262 // Failed to resolve class. We must record the errors so that subsequent attempts 263 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). 264 if (HAS_PENDING_EXCEPTION) { 265 ResourceMark rm; 266 Symbol* error = PENDING_EXCEPTION->klass()->name(); 267 268 bool throw_orig_error = false; 269 { 270 MonitorLockerEx ml(this_oop->lock()); 271 272 // some other thread has beaten us and has resolved the class. 273 if (this_oop->tag_at(which).is_klass()) { 274 CLEAR_PENDING_EXCEPTION; 275 entry = this_oop->resolved_klass_at(which); 276 return entry.get_klass(); 277 } 278 279 if (!PENDING_EXCEPTION-> 280 is_a(SystemDictionary::LinkageError_klass())) { 281 // Just throw the exception and don't prevent these classes from 282 // being loaded due to virtual machine errors like StackOverflow 283 // and OutOfMemoryError, etc, or if the thread was hit by stop() 284 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 285 } 286 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) { 287 SystemDictionary::add_resolution_error(this_oop, which, error); 288 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError); 289 } else { 290 // some other thread has put the class in error state. 291 error = SystemDictionary::find_resolution_error(this_oop, which); 292 assert(error != NULL, "checking"); 293 throw_orig_error = true; 294 } 295 } // unlocked 296 297 if (throw_orig_error) { 298 CLEAR_PENDING_EXCEPTION; 299 ResourceMark rm; 300 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); 301 THROW_MSG_0(error, className); 302 } 303 304 return 0; 305 } 306 307 if (TraceClassResolution && !k()->oop_is_array()) { 308 // skip resolving the constant pool so that this code get's 309 // called the next time some bytecodes refer to this class. 310 ResourceMark rm; 311 int line_number = -1; 312 const char * source_file = NULL; 313 if (JavaThread::current()->has_last_Java_frame()) { 314 // try to identify the method which called this function. 315 vframeStream vfst(JavaThread::current()); 316 if (!vfst.at_end()) { 317 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 318 Symbol* s = vfst.method()->method_holder()->source_file_name(); 319 if (s != NULL) { 320 source_file = s->as_C_string(); 321 } 322 } 323 } 324 if (k() != this_oop->pool_holder()) { 325 // only print something if the classes are different 326 if (source_file != NULL) { 327 tty->print("RESOLVE %s %s %s:%d\n", 328 this_oop->pool_holder()->external_name(), 329 InstanceKlass::cast(k())->external_name(), source_file, line_number); 330 } else { 331 tty->print("RESOLVE %s %s\n", 332 this_oop->pool_holder()->external_name(), 333 InstanceKlass::cast(k())->external_name()); 334 } 335 } 336 return k(); 337 } else { 338 MonitorLockerEx ml(this_oop->lock()); 339 // Only updated constant pool - if it is resolved. 340 do_resolve = this_oop->tag_at(which).is_unresolved_klass(); 341 if (do_resolve) { 342 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data(); 343 if (!this_key->is_the_null_class_loader_data()) { 344 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM 345 } 346 this_oop->klass_at_put(which, k()); 347 } 348 } 349 } 350 351 entry = this_oop->resolved_klass_at(which); 352 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); 353 return entry.get_klass(); 354 } 355 356 357 // Does not update ConstantPool* - to avoid any exception throwing. Used 358 // by compiler and exception handling. Also used to avoid classloads for 359 // instanceof operations. Returns NULL if the class has not been loaded or 360 // if the verification of constant pool failed 361 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) { 362 CPSlot entry = this_oop->slot_at(which); 363 if (entry.is_resolved()) { 364 assert(entry.get_klass()->is_klass(), "must be"); 365 return entry.get_klass(); 366 } else { 367 assert(entry.is_unresolved(), "must be either symbol or klass"); 368 Thread *thread = Thread::current(); 369 Symbol* name = entry.get_symbol(); 370 oop loader = this_oop->pool_holder()->class_loader(); 371 oop protection_domain = this_oop->pool_holder()->protection_domain(); 372 Handle h_prot (thread, protection_domain); 373 Handle h_loader (thread, loader); 374 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); 375 376 if (k != NULL) { 377 // Make sure that resolving is legal 378 EXCEPTION_MARK; 379 KlassHandle klass(THREAD, k); 380 // return NULL if verification fails 381 verify_constant_pool_resolve(this_oop, klass, THREAD); 382 if (HAS_PENDING_EXCEPTION) { 383 CLEAR_PENDING_EXCEPTION; 384 return NULL; 385 } 386 return klass(); 387 } else { 388 return k; 389 } 390 } 391 } 392 393 394 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) { 395 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which)); 396 } 397 398 399 // This is an interface for the compiler that allows accessing non-resolved entries 400 // in the constant pool - but still performs the validations tests. Must be used 401 // in a pre-parse of the compiler - to determine what it can do and not do. 402 // Note: We cannot update the ConstantPool from the vm_thread. 403 Klass* ConstantPool::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) { 404 int which = this_oop->klass_ref_index_at(index); 405 CPSlot entry = this_oop->slot_at(which); 406 if (entry.is_resolved()) { 407 assert(entry.get_klass()->is_klass(), "must be"); 408 return entry.get_klass(); 409 } else { 410 assert(entry.is_unresolved(), "must be either symbol or klass"); 411 Symbol* name = entry.get_symbol(); 412 oop loader = this_oop->pool_holder()->class_loader(); 413 oop protection_domain = this_oop->pool_holder()->protection_domain(); 414 Handle h_loader(THREAD, loader); 415 Handle h_prot (THREAD, protection_domain); 416 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD)); 417 418 // Do access check for klasses 419 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL); 420 return k(); 421 } 422 } 423 424 425 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool, 426 int which) { 427 if (cpool->cache() == NULL) return NULL; // nothing to load yet 428 int cache_index = decode_cpcache_index(which, true); 429 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { 430 // FIXME: should be an assert 431 if (PrintMiscellaneous && (Verbose||WizardMode)) { 432 tty->print_cr("bad operand %d in:", which); cpool->print(); 433 } 434 return NULL; 435 } 436 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 437 return e->method_if_resolved(cpool); 438 } 439 440 441 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) { 442 if (cpool->cache() == NULL) return false; // nothing to load yet 443 int cache_index = decode_cpcache_index(which, true); 444 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 445 return e->has_appendix(); 446 } 447 448 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) { 449 if (cpool->cache() == NULL) return NULL; // nothing to load yet 450 int cache_index = decode_cpcache_index(which, true); 451 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 452 return e->appendix_if_resolved(cpool); 453 } 454 455 456 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) { 457 if (cpool->cache() == NULL) return false; // nothing to load yet 458 int cache_index = decode_cpcache_index(which, true); 459 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 460 return e->has_method_type(); 461 } 462 463 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) { 464 if (cpool->cache() == NULL) return NULL; // nothing to load yet 465 int cache_index = decode_cpcache_index(which, true); 466 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 467 return e->method_type_if_resolved(cpool); 468 } 469 470 471 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { 472 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 473 return symbol_at(name_index); 474 } 475 476 477 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { 478 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 479 return symbol_at(signature_index); 480 } 481 482 483 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { 484 int i = which; 485 if (!uncached && cache() != NULL) { 486 if (ConstantPool::is_invokedynamic_index(which)) { 487 // Invokedynamic index is index into resolved_references 488 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); 489 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); 490 assert(tag_at(pool_index).is_name_and_type(), ""); 491 return pool_index; 492 } 493 // change byte-ordering and go via cache 494 i = remap_instruction_operand_from_cache(which); 495 } else { 496 if (tag_at(which).is_invoke_dynamic()) { 497 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); 498 assert(tag_at(pool_index).is_name_and_type(), ""); 499 return pool_index; 500 } 501 } 502 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 503 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); 504 jint ref_index = *int_at_addr(i); 505 return extract_high_short_from_int(ref_index); 506 } 507 508 509 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { 510 guarantee(!ConstantPool::is_invokedynamic_index(which), 511 "an invokedynamic instruction does not have a klass"); 512 int i = which; 513 if (!uncached && cache() != NULL) { 514 // change byte-ordering and go via cache 515 i = remap_instruction_operand_from_cache(which); 516 } 517 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 518 jint ref_index = *int_at_addr(i); 519 return extract_low_short_from_int(ref_index); 520 } 521 522 523 524 int ConstantPool::remap_instruction_operand_from_cache(int operand) { 525 int cpc_index = operand; 526 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); 527 assert((int)(u2)cpc_index == cpc_index, "clean u2"); 528 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); 529 return member_index; 530 } 531 532 533 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) { 534 if (k->oop_is_instance() || k->oop_is_objArray()) { 535 instanceKlassHandle holder (THREAD, this_oop->pool_holder()); 536 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); 537 KlassHandle element (THREAD, elem_oop); 538 539 // The element type could be a typeArray - we only need the access check if it is 540 // an reference to another class 541 if (element->oop_is_instance()) { 542 LinkResolver::check_klass_accessability(holder, element, CHECK); 543 } 544 } 545 } 546 547 548 int ConstantPool::name_ref_index_at(int which_nt) { 549 jint ref_index = name_and_type_at(which_nt); 550 return extract_low_short_from_int(ref_index); 551 } 552 553 554 int ConstantPool::signature_ref_index_at(int which_nt) { 555 jint ref_index = name_and_type_at(which_nt); 556 return extract_high_short_from_int(ref_index); 557 } 558 559 560 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { 561 return klass_at(klass_ref_index_at(which), CHECK_NULL); 562 } 563 564 565 Symbol* ConstantPool::klass_name_at(int which) { 566 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), 567 "Corrupted constant pool"); 568 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 569 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and 570 // tag is not updated atomicly. 571 CPSlot entry = slot_at(which); 572 if (entry.is_resolved()) { 573 // Already resolved - return entry's name. 574 assert(entry.get_klass()->is_klass(), "must be"); 575 return entry.get_klass()->name(); 576 } else { 577 assert(entry.is_unresolved(), "must be either symbol or klass"); 578 return entry.get_symbol(); 579 } 580 } 581 582 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { 583 jint ref_index = klass_ref_index_at(which); 584 return klass_at_noresolve(ref_index); 585 } 586 587 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { 588 jint ref_index = uncached_klass_ref_index_at(which); 589 return klass_at_noresolve(ref_index); 590 } 591 592 char* ConstantPool::string_at_noresolve(int which) { 593 Symbol* s = unresolved_string_at(which); 594 if (s == NULL) { 595 return (char*)"<pseudo-string>"; 596 } else { 597 return unresolved_string_at(which)->as_C_string(); 598 } 599 } 600 601 BasicType ConstantPool::basic_type_for_signature_at(int which) { 602 return FieldType::basic_type(symbol_at(which)); 603 } 604 605 606 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) { 607 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused 608 if (this_oop->tag_at(index).is_string()) { 609 this_oop->string_at(index, CHECK); 610 } 611 } 612 } 613 614 // Resolve all the classes in the constant pool. If they are all resolved, 615 // the constant pool is read-only. Enhancement: allocate cp entries to 616 // another metaspace, and copy to read-only or read-write space if this 617 // bit is set. 618 bool ConstantPool::resolve_class_constants(TRAPS) { 619 constantPoolHandle cp(THREAD, this); 620 for (int index = 1; index < length(); index++) { // Index 0 is unused 621 if (tag_at(index).is_unresolved_klass() && 622 klass_at_if_loaded(cp, index) == NULL) { 623 return false; 624 } 625 } 626 // set_preresolution(); or some bit for future use 627 return true; 628 } 629 630 // If resolution for MethodHandle or MethodType fails, save the exception 631 // in the resolution error table, so that the same exception is thrown again. 632 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which, 633 int tag, TRAPS) { 634 ResourceMark rm; 635 Symbol* error = PENDING_EXCEPTION->klass()->name(); 636 MonitorLockerEx ml(this_oop->lock()); // lock cpool to change tag. 637 638 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ? 639 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError; 640 641 if (!PENDING_EXCEPTION-> 642 is_a(SystemDictionary::LinkageError_klass())) { 643 // Just throw the exception and don't prevent these classes from 644 // being loaded due to virtual machine errors like StackOverflow 645 // and OutOfMemoryError, etc, or if the thread was hit by stop() 646 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 647 648 } else if (this_oop->tag_at(which).value() != error_tag) { 649 SystemDictionary::add_resolution_error(this_oop, which, error); 650 this_oop->tag_at_put(which, error_tag); 651 } else { 652 // some other thread has put the class in error state. 653 error = SystemDictionary::find_resolution_error(this_oop, which); 654 assert(error != NULL, "checking"); 655 CLEAR_PENDING_EXCEPTION; 656 THROW_MSG(error, ""); 657 } 658 } 659 660 661 // Called to resolve constants in the constant pool and return an oop. 662 // Some constant pool entries cache their resolved oop. This is also 663 // called to create oops from constants to use in arguments for invokedynamic 664 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) { 665 oop result_oop = NULL; 666 Handle throw_exception; 667 668 if (cache_index == _possible_index_sentinel) { 669 // It is possible that this constant is one which is cached in the objects. 670 // We'll do a linear search. This should be OK because this usage is rare. 671 assert(index > 0, "valid index"); 672 cache_index = this_oop->cp_to_object_index(index); 673 } 674 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); 675 assert(index == _no_index_sentinel || index >= 0, ""); 676 677 if (cache_index >= 0) { 678 result_oop = this_oop->resolved_references()->obj_at(cache_index); 679 if (result_oop != NULL) { 680 return result_oop; 681 // That was easy... 682 } 683 index = this_oop->object_to_cp_index(cache_index); 684 } 685 686 jvalue prim_value; // temp used only in a few cases below 687 688 int tag_value = this_oop->tag_at(index).value(); 689 690 switch (tag_value) { 691 692 case JVM_CONSTANT_UnresolvedClass: 693 case JVM_CONSTANT_UnresolvedClassInError: 694 case JVM_CONSTANT_Class: 695 { 696 assert(cache_index == _no_index_sentinel, "should not have been set"); 697 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL); 698 // ldc wants the java mirror. 699 result_oop = resolved->java_mirror(); 700 break; 701 } 702 703 case JVM_CONSTANT_String: 704 assert(cache_index != _no_index_sentinel, "should have been set"); 705 if (this_oop->is_pseudo_string_at(index)) { 706 result_oop = this_oop->pseudo_string_at(index, cache_index); 707 break; 708 } 709 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL); 710 break; 711 712 case JVM_CONSTANT_Object: 713 result_oop = this_oop->object_at(index); 714 break; 715 716 case JVM_CONSTANT_MethodHandleInError: 717 case JVM_CONSTANT_MethodTypeInError: 718 { 719 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index); 720 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); 721 ResourceMark rm; 722 THROW_MSG_0(error, ""); 723 break; 724 } 725 726 case JVM_CONSTANT_MethodHandle: 727 { 728 int ref_kind = this_oop->method_handle_ref_kind_at(index); 729 int callee_index = this_oop->method_handle_klass_index_at(index); 730 Symbol* name = this_oop->method_handle_name_ref_at(index); 731 Symbol* signature = this_oop->method_handle_signature_ref_at(index); 732 if (PrintMiscellaneous) 733 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", 734 ref_kind, index, this_oop->method_handle_index_at(index), 735 callee_index, name->as_C_string(), signature->as_C_string()); 736 KlassHandle callee; 737 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL); 738 callee = KlassHandle(THREAD, k); 739 } 740 KlassHandle klass(THREAD, this_oop->pool_holder()); 741 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, 742 callee, name, signature, 743 THREAD); 744 result_oop = value(); 745 if (HAS_PENDING_EXCEPTION) { 746 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); 747 } 748 break; 749 } 750 751 case JVM_CONSTANT_MethodType: 752 { 753 Symbol* signature = this_oop->method_type_signature_at(index); 754 if (PrintMiscellaneous) 755 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", 756 index, this_oop->method_type_index_at(index), 757 signature->as_C_string()); 758 KlassHandle klass(THREAD, this_oop->pool_holder()); 759 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); 760 result_oop = value(); 761 if (HAS_PENDING_EXCEPTION) { 762 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); 763 } 764 break; 765 } 766 767 case JVM_CONSTANT_Integer: 768 assert(cache_index == _no_index_sentinel, "should not have been set"); 769 prim_value.i = this_oop->int_at(index); 770 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); 771 break; 772 773 case JVM_CONSTANT_Float: 774 assert(cache_index == _no_index_sentinel, "should not have been set"); 775 prim_value.f = this_oop->float_at(index); 776 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); 777 break; 778 779 case JVM_CONSTANT_Long: 780 assert(cache_index == _no_index_sentinel, "should not have been set"); 781 prim_value.j = this_oop->long_at(index); 782 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); 783 break; 784 785 case JVM_CONSTANT_Double: 786 assert(cache_index == _no_index_sentinel, "should not have been set"); 787 prim_value.d = this_oop->double_at(index); 788 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); 789 break; 790 791 default: 792 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", 793 this_oop(), index, cache_index, tag_value) ); 794 assert(false, "unexpected constant tag"); 795 break; 796 } 797 798 if (cache_index >= 0) { 799 // Cache the oop here also. 800 Handle result_handle(THREAD, result_oop); 801 MonitorLockerEx ml(this_oop->lock()); // don't know if we really need this 802 oop result = this_oop->resolved_references()->obj_at(cache_index); 803 // Benign race condition: resolved_references may already be filled in while we were trying to lock. 804 // The important thing here is that all threads pick up the same result. 805 // It doesn't matter which racing thread wins, as long as only one 806 // result is used by all threads, and all future queries. 807 // That result may be either a resolved constant or a failure exception. 808 if (result == NULL) { 809 this_oop->resolved_references()->obj_at_put(cache_index, result_handle()); 810 return result_handle(); 811 } else { 812 // Return the winning thread's result. This can be different than 813 // result_handle() for MethodHandles. 814 return result; 815 } 816 } else { 817 return result_oop; 818 } 819 } 820 821 oop ConstantPool::uncached_string_at(int which, TRAPS) { 822 Symbol* sym = unresolved_string_at(which); 823 oop str = StringTable::intern(sym, CHECK_(NULL)); 824 assert(java_lang_String::is_instance(str), "must be string"); 825 return str; 826 } 827 828 829 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) { 830 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); 831 832 Handle bsm; 833 int argc; 834 { 835 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments 836 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. 837 // It is accompanied by the optional arguments. 838 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index); 839 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); 840 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { 841 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); 842 } 843 844 // Extract the optional static arguments. 845 argc = this_oop->invoke_dynamic_argument_count_at(index); 846 if (argc == 0) return bsm_oop; 847 848 bsm = Handle(THREAD, bsm_oop); 849 } 850 851 objArrayHandle info; 852 { 853 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); 854 info = objArrayHandle(THREAD, info_oop); 855 } 856 857 info->obj_at_put(0, bsm()); 858 for (int i = 0; i < argc; i++) { 859 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i); 860 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); 861 info->obj_at_put(1+i, arg_oop); 862 } 863 864 return info(); 865 } 866 867 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) { 868 // If the string has already been interned, this entry will be non-null 869 oop str = this_oop->resolved_references()->obj_at(obj_index); 870 if (str != NULL) return str; 871 872 Symbol* sym = this_oop->unresolved_string_at(which); 873 str = StringTable::intern(sym, CHECK_(NULL)); 874 this_oop->string_at_put(which, obj_index, str); 875 assert(java_lang_String::is_instance(str), "must be string"); 876 return str; 877 } 878 879 880 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, 881 int which) { 882 // Names are interned, so we can compare Symbol*s directly 883 Symbol* cp_name = klass_name_at(which); 884 return (cp_name == k->name()); 885 } 886 887 888 // Iterate over symbols and decrement ones which are Symbol*s. 889 // This is done during GC so do not need to lock constantPool unless we 890 // have per-thread safepoints. 891 // Only decrement the UTF8 symbols. Unresolved classes and strings point to 892 // these symbols but didn't increment the reference count. 893 void ConstantPool::unreference_symbols() { 894 for (int index = 1; index < length(); index++) { // Index 0 is unused 895 constantTag tag = tag_at(index); 896 if (tag.is_symbol()) { 897 symbol_at(index)->decrement_refcount(); 898 } 899 } 900 } 901 902 903 // Compare this constant pool's entry at index1 to the constant pool 904 // cp2's entry at index2. 905 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2, 906 int index2, TRAPS) { 907 908 jbyte t1 = tag_at(index1).value(); 909 jbyte t2 = cp2->tag_at(index2).value(); 910 911 912 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass 913 // when comparing 914 if (t1 == JVM_CONSTANT_UnresolvedClassInError) { 915 t1 = JVM_CONSTANT_UnresolvedClass; 916 } 917 if (t2 == JVM_CONSTANT_UnresolvedClassInError) { 918 t2 = JVM_CONSTANT_UnresolvedClass; 919 } 920 921 if (t1 != t2) { 922 // Not the same entry type so there is nothing else to check. Note 923 // that this style of checking will consider resolved/unresolved 924 // class pairs as different. 925 // From the ConstantPool* API point of view, this is correct 926 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this 927 // plays out in the context of ConstantPool* merging. 928 return false; 929 } 930 931 switch (t1) { 932 case JVM_CONSTANT_Class: 933 { 934 Klass* k1 = klass_at(index1, CHECK_false); 935 Klass* k2 = cp2->klass_at(index2, CHECK_false); 936 if (k1 == k2) { 937 return true; 938 } 939 } break; 940 941 case JVM_CONSTANT_ClassIndex: 942 { 943 int recur1 = klass_index_at(index1); 944 int recur2 = cp2->klass_index_at(index2); 945 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 946 if (match) { 947 return true; 948 } 949 } break; 950 951 case JVM_CONSTANT_Double: 952 { 953 jdouble d1 = double_at(index1); 954 jdouble d2 = cp2->double_at(index2); 955 if (d1 == d2) { 956 return true; 957 } 958 } break; 959 960 case JVM_CONSTANT_Fieldref: 961 case JVM_CONSTANT_InterfaceMethodref: 962 case JVM_CONSTANT_Methodref: 963 { 964 int recur1 = uncached_klass_ref_index_at(index1); 965 int recur2 = cp2->uncached_klass_ref_index_at(index2); 966 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 967 if (match) { 968 recur1 = uncached_name_and_type_ref_index_at(index1); 969 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); 970 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 971 if (match) { 972 return true; 973 } 974 } 975 } break; 976 977 case JVM_CONSTANT_Float: 978 { 979 jfloat f1 = float_at(index1); 980 jfloat f2 = cp2->float_at(index2); 981 if (f1 == f2) { 982 return true; 983 } 984 } break; 985 986 case JVM_CONSTANT_Integer: 987 { 988 jint i1 = int_at(index1); 989 jint i2 = cp2->int_at(index2); 990 if (i1 == i2) { 991 return true; 992 } 993 } break; 994 995 case JVM_CONSTANT_Long: 996 { 997 jlong l1 = long_at(index1); 998 jlong l2 = cp2->long_at(index2); 999 if (l1 == l2) { 1000 return true; 1001 } 1002 } break; 1003 1004 case JVM_CONSTANT_NameAndType: 1005 { 1006 int recur1 = name_ref_index_at(index1); 1007 int recur2 = cp2->name_ref_index_at(index2); 1008 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1009 if (match) { 1010 recur1 = signature_ref_index_at(index1); 1011 recur2 = cp2->signature_ref_index_at(index2); 1012 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1013 if (match) { 1014 return true; 1015 } 1016 } 1017 } break; 1018 1019 case JVM_CONSTANT_StringIndex: 1020 { 1021 int recur1 = string_index_at(index1); 1022 int recur2 = cp2->string_index_at(index2); 1023 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1024 if (match) { 1025 return true; 1026 } 1027 } break; 1028 1029 case JVM_CONSTANT_UnresolvedClass: 1030 { 1031 Symbol* k1 = unresolved_klass_at(index1); 1032 Symbol* k2 = cp2->unresolved_klass_at(index2); 1033 if (k1 == k2) { 1034 return true; 1035 } 1036 } break; 1037 1038 case JVM_CONSTANT_MethodType: 1039 { 1040 int k1 = method_type_index_at(index1); 1041 int k2 = cp2->method_type_index_at(index2); 1042 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1043 if (match) { 1044 return true; 1045 } 1046 } break; 1047 1048 case JVM_CONSTANT_MethodHandle: 1049 { 1050 int k1 = method_handle_ref_kind_at(index1); 1051 int k2 = cp2->method_handle_ref_kind_at(index2); 1052 if (k1 == k2) { 1053 int i1 = method_handle_index_at(index1); 1054 int i2 = cp2->method_handle_index_at(index2); 1055 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); 1056 if (match) { 1057 return true; 1058 } 1059 } 1060 } break; 1061 1062 case JVM_CONSTANT_InvokeDynamic: 1063 { 1064 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1); 1065 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2); 1066 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1067 if (!match) return false; 1068 k1 = invoke_dynamic_name_and_type_ref_index_at(index1); 1069 k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); 1070 match = compare_entry_to(k1, cp2, k2, CHECK_false); 1071 if (!match) return false; 1072 int argc = invoke_dynamic_argument_count_at(index1); 1073 if (argc == cp2->invoke_dynamic_argument_count_at(index2)) { 1074 for (int j = 0; j < argc; j++) { 1075 k1 = invoke_dynamic_argument_index_at(index1, j); 1076 k2 = cp2->invoke_dynamic_argument_index_at(index2, j); 1077 match = compare_entry_to(k1, cp2, k2, CHECK_false); 1078 if (!match) return false; 1079 } 1080 return true; // got through loop; all elements equal 1081 } 1082 } break; 1083 1084 case JVM_CONSTANT_String: 1085 { 1086 Symbol* s1 = unresolved_string_at(index1); 1087 Symbol* s2 = cp2->unresolved_string_at(index2); 1088 if (s1 == s2) { 1089 return true; 1090 } 1091 } break; 1092 1093 case JVM_CONSTANT_Utf8: 1094 { 1095 Symbol* s1 = symbol_at(index1); 1096 Symbol* s2 = cp2->symbol_at(index2); 1097 if (s1 == s2) { 1098 return true; 1099 } 1100 } break; 1101 1102 // Invalid is used as the tag for the second constant pool entry 1103 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1104 // not be seen by itself. 1105 case JVM_CONSTANT_Invalid: // fall through 1106 1107 default: 1108 ShouldNotReachHere(); 1109 break; 1110 } 1111 1112 return false; 1113 } // end compare_entry_to() 1114 1115 1116 // Copy this constant pool's entries at start_i to end_i (inclusive) 1117 // to the constant pool to_cp's entries starting at to_i. A total of 1118 // (end_i - start_i) + 1 entries are copied. 1119 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, 1120 constantPoolHandle to_cp, int to_i, TRAPS) { 1121 1122 int dest_i = to_i; // leave original alone for debug purposes 1123 1124 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { 1125 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); 1126 1127 switch (from_cp->tag_at(src_i).value()) { 1128 case JVM_CONSTANT_Double: 1129 case JVM_CONSTANT_Long: 1130 // double and long take two constant pool entries 1131 src_i += 2; 1132 dest_i += 2; 1133 break; 1134 1135 default: 1136 // all others take one constant pool entry 1137 src_i++; 1138 dest_i++; 1139 break; 1140 } 1141 } 1142 1143 int from_oplen = operand_array_length(from_cp->operands()); 1144 int old_oplen = operand_array_length(to_cp->operands()); 1145 if (from_oplen != 0) { 1146 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); 1147 // append my operands to the target's operands array 1148 if (old_oplen == 0) { 1149 // Can't just reuse from_cp's operand list because of deallocation issues 1150 int len = from_cp->operands()->length(); 1151 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); 1152 Copy::conjoint_memory_atomic( 1153 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); 1154 to_cp->set_operands(new_ops); 1155 } else { 1156 int old_len = to_cp->operands()->length(); 1157 int from_len = from_cp->operands()->length(); 1158 int old_off = old_oplen * sizeof(u2); 1159 int from_off = from_oplen * sizeof(u2); 1160 // Use the metaspace for the destination constant pool 1161 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); 1162 int fillp = 0, len = 0; 1163 // first part of dest 1164 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), 1165 new_operands->adr_at(fillp), 1166 (len = old_off) * sizeof(u2)); 1167 fillp += len; 1168 // first part of src 1169 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), 1170 new_operands->adr_at(fillp), 1171 (len = from_off) * sizeof(u2)); 1172 fillp += len; 1173 // second part of dest 1174 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), 1175 new_operands->adr_at(fillp), 1176 (len = old_len - old_off) * sizeof(u2)); 1177 fillp += len; 1178 // second part of src 1179 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(from_off), 1180 new_operands->adr_at(fillp), 1181 (len = from_len - from_off) * sizeof(u2)); 1182 fillp += len; 1183 assert(fillp == new_operands->length(), ""); 1184 1185 // Adjust indexes in the first part of the copied operands array. 1186 for (int j = 0; j < from_oplen; j++) { 1187 int offset = operand_offset_at(new_operands, old_oplen + j); 1188 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); 1189 offset += old_len; // every new tuple is preceded by old_len extra u2's 1190 operand_offset_at_put(new_operands, old_oplen + j, offset); 1191 } 1192 1193 // replace target operands array with combined array 1194 to_cp->set_operands(new_operands); 1195 } 1196 } 1197 1198 } // end copy_cp_to() 1199 1200 1201 // Copy this constant pool's entry at from_i to the constant pool 1202 // to_cp's entry at to_i. 1203 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i, 1204 constantPoolHandle to_cp, int to_i, 1205 TRAPS) { 1206 1207 int tag = from_cp->tag_at(from_i).value(); 1208 switch (tag) { 1209 case JVM_CONSTANT_Class: 1210 { 1211 Klass* k = from_cp->klass_at(from_i, CHECK); 1212 to_cp->klass_at_put(to_i, k); 1213 } break; 1214 1215 case JVM_CONSTANT_ClassIndex: 1216 { 1217 jint ki = from_cp->klass_index_at(from_i); 1218 to_cp->klass_index_at_put(to_i, ki); 1219 } break; 1220 1221 case JVM_CONSTANT_Double: 1222 { 1223 jdouble d = from_cp->double_at(from_i); 1224 to_cp->double_at_put(to_i, d); 1225 // double takes two constant pool entries so init second entry's tag 1226 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1227 } break; 1228 1229 case JVM_CONSTANT_Fieldref: 1230 { 1231 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1232 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1233 to_cp->field_at_put(to_i, class_index, name_and_type_index); 1234 } break; 1235 1236 case JVM_CONSTANT_Float: 1237 { 1238 jfloat f = from_cp->float_at(from_i); 1239 to_cp->float_at_put(to_i, f); 1240 } break; 1241 1242 case JVM_CONSTANT_Integer: 1243 { 1244 jint i = from_cp->int_at(from_i); 1245 to_cp->int_at_put(to_i, i); 1246 } break; 1247 1248 case JVM_CONSTANT_InterfaceMethodref: 1249 { 1250 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1251 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1252 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); 1253 } break; 1254 1255 case JVM_CONSTANT_Long: 1256 { 1257 jlong l = from_cp->long_at(from_i); 1258 to_cp->long_at_put(to_i, l); 1259 // long takes two constant pool entries so init second entry's tag 1260 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1261 } break; 1262 1263 case JVM_CONSTANT_Methodref: 1264 { 1265 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1266 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1267 to_cp->method_at_put(to_i, class_index, name_and_type_index); 1268 } break; 1269 1270 case JVM_CONSTANT_NameAndType: 1271 { 1272 int name_ref_index = from_cp->name_ref_index_at(from_i); 1273 int signature_ref_index = from_cp->signature_ref_index_at(from_i); 1274 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); 1275 } break; 1276 1277 case JVM_CONSTANT_StringIndex: 1278 { 1279 jint si = from_cp->string_index_at(from_i); 1280 to_cp->string_index_at_put(to_i, si); 1281 } break; 1282 1283 case JVM_CONSTANT_UnresolvedClass: 1284 { 1285 // Can be resolved after checking tag, so check the slot first. 1286 CPSlot entry = from_cp->slot_at(from_i); 1287 if (entry.is_resolved()) { 1288 assert(entry.get_klass()->is_klass(), "must be"); 1289 // Already resolved 1290 to_cp->klass_at_put(to_i, entry.get_klass()); 1291 } else { 1292 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); 1293 } 1294 } break; 1295 1296 case JVM_CONSTANT_UnresolvedClassInError: 1297 { 1298 Symbol* k = from_cp->unresolved_klass_at(from_i); 1299 to_cp->unresolved_klass_at_put(to_i, k); 1300 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError); 1301 } break; 1302 1303 1304 case JVM_CONSTANT_String: 1305 { 1306 Symbol* s = from_cp->unresolved_string_at(from_i); 1307 to_cp->unresolved_string_at_put(to_i, s); 1308 } break; 1309 1310 case JVM_CONSTANT_Utf8: 1311 { 1312 Symbol* s = from_cp->symbol_at(from_i); 1313 // Need to increase refcount, the old one will be thrown away and deferenced 1314 s->increment_refcount(); 1315 to_cp->symbol_at_put(to_i, s); 1316 } break; 1317 1318 case JVM_CONSTANT_MethodType: 1319 { 1320 jint k = from_cp->method_type_index_at(from_i); 1321 to_cp->method_type_index_at_put(to_i, k); 1322 } break; 1323 1324 case JVM_CONSTANT_MethodHandle: 1325 { 1326 int k1 = from_cp->method_handle_ref_kind_at(from_i); 1327 int k2 = from_cp->method_handle_index_at(from_i); 1328 to_cp->method_handle_index_at_put(to_i, k1, k2); 1329 } break; 1330 1331 case JVM_CONSTANT_InvokeDynamic: 1332 { 1333 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); 1334 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); 1335 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1336 to_cp->invoke_dynamic_at_put(to_i, k1, k2); 1337 } break; 1338 1339 // Invalid is used as the tag for the second constant pool entry 1340 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1341 // not be seen by itself. 1342 case JVM_CONSTANT_Invalid: // fall through 1343 1344 default: 1345 { 1346 ShouldNotReachHere(); 1347 } break; 1348 } 1349 } // end copy_entry_to() 1350 1351 1352 // Search constant pool search_cp for an entry that matches this 1353 // constant pool's entry at pattern_i. Returns the index of a 1354 // matching entry or zero (0) if there is no matching entry. 1355 int ConstantPool::find_matching_entry(int pattern_i, 1356 constantPoolHandle search_cp, TRAPS) { 1357 1358 // index zero (0) is not used 1359 for (int i = 1; i < search_cp->length(); i++) { 1360 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); 1361 if (found) { 1362 return i; 1363 } 1364 } 1365 1366 return 0; // entry not found; return unused index zero (0) 1367 } // end find_matching_entry() 1368 1369 1370 #ifndef PRODUCT 1371 1372 const char* ConstantPool::printable_name_at(int which) { 1373 1374 constantTag tag = tag_at(which); 1375 1376 if (tag.is_string()) { 1377 return string_at_noresolve(which); 1378 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 1379 return klass_name_at(which)->as_C_string(); 1380 } else if (tag.is_symbol()) { 1381 return symbol_at(which)->as_C_string(); 1382 } 1383 return ""; 1384 } 1385 1386 #endif // PRODUCT 1387 1388 1389 // JVMTI GetConstantPool support 1390 1391 // For temporary use until code is stable. 1392 #if DEBUG_CPOOL 1393 #define DBG(code) code 1394 1395 static const char* WARN_MSG = "Must not be such entry!"; 1396 1397 static void print_cpool_bytes(jint cnt, u1 *bytes) { 1398 jint size = 0; 1399 u2 idx1, idx2; 1400 1401 for (jint idx = 1; idx < cnt; idx++) { 1402 jint ent_size = 0; 1403 u1 tag = *bytes++; 1404 size++; // count tag 1405 1406 printf("const #%03d, tag: %02d ", idx, tag); 1407 switch(tag) { 1408 case JVM_CONSTANT_Invalid: { 1409 printf("Invalid"); 1410 break; 1411 } 1412 case JVM_CONSTANT_Unicode: { 1413 printf("Unicode %s", WARN_MSG); 1414 break; 1415 } 1416 case JVM_CONSTANT_Utf8: { 1417 u2 len = Bytes::get_Java_u2(bytes); 1418 char str[128]; 1419 if (len > 127) { 1420 len = 127; 1421 } 1422 strncpy(str, (char *) (bytes+2), len); 1423 str[len] = '\0'; 1424 printf("Utf8 \"%s\"", str); 1425 ent_size = 2 + len; 1426 break; 1427 } 1428 case JVM_CONSTANT_Integer: { 1429 u4 val = Bytes::get_Java_u4(bytes); 1430 printf("int %d", *(int *) &val); 1431 ent_size = 4; 1432 break; 1433 } 1434 case JVM_CONSTANT_Float: { 1435 u4 val = Bytes::get_Java_u4(bytes); 1436 printf("float %5.3ff", *(float *) &val); 1437 ent_size = 4; 1438 break; 1439 } 1440 case JVM_CONSTANT_Long: { 1441 u8 val = Bytes::get_Java_u8(bytes); 1442 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val); 1443 ent_size = 8; 1444 idx++; // Long takes two cpool slots 1445 break; 1446 } 1447 case JVM_CONSTANT_Double: { 1448 u8 val = Bytes::get_Java_u8(bytes); 1449 printf("double %5.3fd", *(jdouble *)&val); 1450 ent_size = 8; 1451 idx++; // Double takes two cpool slots 1452 break; 1453 } 1454 case JVM_CONSTANT_Class: { 1455 idx1 = Bytes::get_Java_u2(bytes); 1456 printf("class #%03d", idx1); 1457 ent_size = 2; 1458 break; 1459 } 1460 case JVM_CONSTANT_String: { 1461 idx1 = Bytes::get_Java_u2(bytes); 1462 printf("String #%03d", idx1); 1463 ent_size = 2; 1464 break; 1465 } 1466 case JVM_CONSTANT_Fieldref: { 1467 idx1 = Bytes::get_Java_u2(bytes); 1468 idx2 = Bytes::get_Java_u2(bytes+2); 1469 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); 1470 ent_size = 4; 1471 break; 1472 } 1473 case JVM_CONSTANT_Methodref: { 1474 idx1 = Bytes::get_Java_u2(bytes); 1475 idx2 = Bytes::get_Java_u2(bytes+2); 1476 printf("Method #%03d, #%03d", idx1, idx2); 1477 ent_size = 4; 1478 break; 1479 } 1480 case JVM_CONSTANT_InterfaceMethodref: { 1481 idx1 = Bytes::get_Java_u2(bytes); 1482 idx2 = Bytes::get_Java_u2(bytes+2); 1483 printf("InterfMethod #%03d, #%03d", idx1, idx2); 1484 ent_size = 4; 1485 break; 1486 } 1487 case JVM_CONSTANT_NameAndType: { 1488 idx1 = Bytes::get_Java_u2(bytes); 1489 idx2 = Bytes::get_Java_u2(bytes+2); 1490 printf("NameAndType #%03d, #%03d", idx1, idx2); 1491 ent_size = 4; 1492 break; 1493 } 1494 case JVM_CONSTANT_ClassIndex: { 1495 printf("ClassIndex %s", WARN_MSG); 1496 break; 1497 } 1498 case JVM_CONSTANT_UnresolvedClass: { 1499 printf("UnresolvedClass: %s", WARN_MSG); 1500 break; 1501 } 1502 case JVM_CONSTANT_UnresolvedClassInError: { 1503 printf("UnresolvedClassInErr: %s", WARN_MSG); 1504 break; 1505 } 1506 case JVM_CONSTANT_StringIndex: { 1507 printf("StringIndex: %s", WARN_MSG); 1508 break; 1509 } 1510 } 1511 printf(";\n"); 1512 bytes += ent_size; 1513 size += ent_size; 1514 } 1515 printf("Cpool size: %d\n", size); 1516 fflush(0); 1517 return; 1518 } /* end print_cpool_bytes */ 1519 1520 #else 1521 1522 #define DBG(code) 1523 1524 #endif 1525 1526 1527 // Returns size of constant pool entry. 1528 jint ConstantPool::cpool_entry_size(jint idx) { 1529 switch(tag_at(idx).value()) { 1530 case JVM_CONSTANT_Invalid: 1531 case JVM_CONSTANT_Unicode: 1532 return 1; 1533 1534 case JVM_CONSTANT_Utf8: 1535 return 3 + symbol_at(idx)->utf8_length(); 1536 1537 case JVM_CONSTANT_Class: 1538 case JVM_CONSTANT_String: 1539 case JVM_CONSTANT_ClassIndex: 1540 case JVM_CONSTANT_UnresolvedClass: 1541 case JVM_CONSTANT_UnresolvedClassInError: 1542 case JVM_CONSTANT_StringIndex: 1543 case JVM_CONSTANT_MethodType: 1544 return 3; 1545 1546 case JVM_CONSTANT_MethodHandle: 1547 return 4; //tag, ref_kind, ref_index 1548 1549 case JVM_CONSTANT_Integer: 1550 case JVM_CONSTANT_Float: 1551 case JVM_CONSTANT_Fieldref: 1552 case JVM_CONSTANT_Methodref: 1553 case JVM_CONSTANT_InterfaceMethodref: 1554 case JVM_CONSTANT_NameAndType: 1555 return 5; 1556 1557 case JVM_CONSTANT_InvokeDynamic: 1558 // u1 tag, u2 bsm, u2 nt 1559 return 5; 1560 1561 case JVM_CONSTANT_Long: 1562 case JVM_CONSTANT_Double: 1563 return 9; 1564 } 1565 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); 1566 return 1; 1567 } /* end cpool_entry_size */ 1568 1569 1570 // SymbolHashMap is used to find a constant pool index from a string. 1571 // This function fills in SymbolHashMaps, one for utf8s and one for 1572 // class names, returns size of the cpool raw bytes. 1573 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, 1574 SymbolHashMap *classmap) { 1575 jint size = 0; 1576 1577 for (u2 idx = 1; idx < length(); idx++) { 1578 u2 tag = tag_at(idx).value(); 1579 size += cpool_entry_size(idx); 1580 1581 switch(tag) { 1582 case JVM_CONSTANT_Utf8: { 1583 Symbol* sym = symbol_at(idx); 1584 symmap->add_entry(sym, idx); 1585 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); 1586 break; 1587 } 1588 case JVM_CONSTANT_Class: 1589 case JVM_CONSTANT_UnresolvedClass: 1590 case JVM_CONSTANT_UnresolvedClassInError: { 1591 Symbol* sym = klass_name_at(idx); 1592 classmap->add_entry(sym, idx); 1593 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); 1594 break; 1595 } 1596 case JVM_CONSTANT_Long: 1597 case JVM_CONSTANT_Double: { 1598 idx++; // Both Long and Double take two cpool slots 1599 break; 1600 } 1601 } 1602 } 1603 return size; 1604 } /* end hash_utf8_entries_to */ 1605 1606 1607 // Copy cpool bytes. 1608 // Returns: 1609 // 0, in case of OutOfMemoryError 1610 // -1, in case of internal error 1611 // > 0, count of the raw cpool bytes that have been copied 1612 int ConstantPool::copy_cpool_bytes(int cpool_size, 1613 SymbolHashMap* tbl, 1614 unsigned char *bytes) { 1615 u2 idx1, idx2; 1616 jint size = 0; 1617 jint cnt = length(); 1618 unsigned char *start_bytes = bytes; 1619 1620 for (jint idx = 1; idx < cnt; idx++) { 1621 u1 tag = tag_at(idx).value(); 1622 jint ent_size = cpool_entry_size(idx); 1623 1624 assert(size + ent_size <= cpool_size, "Size mismatch"); 1625 1626 *bytes = tag; 1627 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); 1628 switch(tag) { 1629 case JVM_CONSTANT_Invalid: { 1630 DBG(printf("JVM_CONSTANT_Invalid")); 1631 break; 1632 } 1633 case JVM_CONSTANT_Unicode: { 1634 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); 1635 DBG(printf("JVM_CONSTANT_Unicode")); 1636 break; 1637 } 1638 case JVM_CONSTANT_Utf8: { 1639 Symbol* sym = symbol_at(idx); 1640 char* str = sym->as_utf8(); 1641 // Warning! It's crashing on x86 with len = sym->utf8_length() 1642 int len = (int) strlen(str); 1643 Bytes::put_Java_u2((address) (bytes+1), (u2) len); 1644 for (int i = 0; i < len; i++) { 1645 bytes[3+i] = (u1) str[i]; 1646 } 1647 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); 1648 break; 1649 } 1650 case JVM_CONSTANT_Integer: { 1651 jint val = int_at(idx); 1652 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1653 break; 1654 } 1655 case JVM_CONSTANT_Float: { 1656 jfloat val = float_at(idx); 1657 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1658 break; 1659 } 1660 case JVM_CONSTANT_Long: { 1661 jlong val = long_at(idx); 1662 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1663 idx++; // Long takes two cpool slots 1664 break; 1665 } 1666 case JVM_CONSTANT_Double: { 1667 jdouble val = double_at(idx); 1668 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1669 idx++; // Double takes two cpool slots 1670 break; 1671 } 1672 case JVM_CONSTANT_Class: 1673 case JVM_CONSTANT_UnresolvedClass: 1674 case JVM_CONSTANT_UnresolvedClassInError: { 1675 *bytes = JVM_CONSTANT_Class; 1676 Symbol* sym = klass_name_at(idx); 1677 idx1 = tbl->symbol_to_value(sym); 1678 assert(idx1 != 0, "Have not found a hashtable entry"); 1679 Bytes::put_Java_u2((address) (bytes+1), idx1); 1680 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); 1681 break; 1682 } 1683 case JVM_CONSTANT_String: { 1684 *bytes = JVM_CONSTANT_String; 1685 Symbol* sym = unresolved_string_at(idx); 1686 idx1 = tbl->symbol_to_value(sym); 1687 assert(idx1 != 0, "Have not found a hashtable entry"); 1688 Bytes::put_Java_u2((address) (bytes+1), idx1); 1689 DBG(char *str = sym->as_utf8()); 1690 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str)); 1691 break; 1692 } 1693 case JVM_CONSTANT_Fieldref: 1694 case JVM_CONSTANT_Methodref: 1695 case JVM_CONSTANT_InterfaceMethodref: { 1696 idx1 = uncached_klass_ref_index_at(idx); 1697 idx2 = uncached_name_and_type_ref_index_at(idx); 1698 Bytes::put_Java_u2((address) (bytes+1), idx1); 1699 Bytes::put_Java_u2((address) (bytes+3), idx2); 1700 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); 1701 break; 1702 } 1703 case JVM_CONSTANT_NameAndType: { 1704 idx1 = name_ref_index_at(idx); 1705 idx2 = signature_ref_index_at(idx); 1706 Bytes::put_Java_u2((address) (bytes+1), idx1); 1707 Bytes::put_Java_u2((address) (bytes+3), idx2); 1708 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); 1709 break; 1710 } 1711 case JVM_CONSTANT_ClassIndex: { 1712 *bytes = JVM_CONSTANT_Class; 1713 idx1 = klass_index_at(idx); 1714 Bytes::put_Java_u2((address) (bytes+1), idx1); 1715 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); 1716 break; 1717 } 1718 case JVM_CONSTANT_StringIndex: { 1719 *bytes = JVM_CONSTANT_String; 1720 idx1 = string_index_at(idx); 1721 Bytes::put_Java_u2((address) (bytes+1), idx1); 1722 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); 1723 break; 1724 } 1725 case JVM_CONSTANT_MethodHandle: 1726 case JVM_CONSTANT_MethodHandleInError: { 1727 *bytes = JVM_CONSTANT_MethodHandle; 1728 int kind = method_handle_ref_kind_at(idx); 1729 idx1 = method_handle_index_at(idx); 1730 *(bytes+1) = (unsigned char) kind; 1731 Bytes::put_Java_u2((address) (bytes+2), idx1); 1732 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); 1733 break; 1734 } 1735 case JVM_CONSTANT_MethodType: 1736 case JVM_CONSTANT_MethodTypeInError: { 1737 *bytes = JVM_CONSTANT_MethodType; 1738 idx1 = method_type_index_at(idx); 1739 Bytes::put_Java_u2((address) (bytes+1), idx1); 1740 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); 1741 break; 1742 } 1743 case JVM_CONSTANT_InvokeDynamic: { 1744 *bytes = tag; 1745 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 1746 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 1747 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); 1748 Bytes::put_Java_u2((address) (bytes+1), idx1); 1749 Bytes::put_Java_u2((address) (bytes+3), idx2); 1750 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); 1751 break; 1752 } 1753 } 1754 DBG(printf("\n")); 1755 bytes += ent_size; 1756 size += ent_size; 1757 } 1758 assert(size == cpool_size, "Size mismatch"); 1759 1760 // Keep temorarily for debugging until it's stable. 1761 DBG(print_cpool_bytes(cnt, start_bytes)); 1762 return (int)(bytes - start_bytes); 1763 } /* end copy_cpool_bytes */ 1764 1765 1766 void ConstantPool::set_on_stack(const bool value) { 1767 _on_stack = value; 1768 if (value) MetadataOnStackMark::record(this); 1769 } 1770 1771 // JSR 292 support for patching constant pool oops after the class is linked and 1772 // the oop array for resolved references are created. 1773 // We can't do this during classfile parsing, which is how the other indexes are 1774 // patched. The other patches are applied early for some error checking 1775 // so only defer the pseudo_strings. 1776 void ConstantPool::patch_resolved_references( 1777 GrowableArray<Handle>* cp_patches) { 1778 assert(EnableInvokeDynamic, ""); 1779 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused 1780 Handle patch = cp_patches->at(index); 1781 if (patch.not_null()) { 1782 assert (tag_at(index).is_string(), "should only be string left"); 1783 // Patching a string means pre-resolving it. 1784 // The spelling in the constant pool is ignored. 1785 // The constant reference may be any object whatever. 1786 // If it is not a real interned string, the constant is referred 1787 // to as a "pseudo-string", and must be presented to the CP 1788 // explicitly, because it may require scavenging. 1789 int obj_index = cp_to_object_index(index); 1790 pseudo_string_at_put(index, obj_index, patch()); 1791 DEBUG_ONLY(cp_patches->at_put(index, Handle());) 1792 } 1793 } 1794 #ifdef ASSERT 1795 // Ensure that all the patches have been used. 1796 for (int index = 0; index < cp_patches->length(); index++) { 1797 assert(cp_patches->at(index).is_null(), 1798 err_msg("Unused constant pool patch at %d in class file %s", 1799 index, 1800 pool_holder()->external_name())); 1801 } 1802 #endif // ASSERT 1803 } 1804 1805 #ifndef PRODUCT 1806 1807 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool 1808 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { 1809 guarantee(obj->is_constantPool(), "object must be constant pool"); 1810 constantPoolHandle cp(THREAD, (ConstantPool*)obj); 1811 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); 1812 1813 for (int i = 0; i< cp->length(); i++) { 1814 if (cp->tag_at(i).is_unresolved_klass()) { 1815 // This will force loading of the class 1816 Klass* klass = cp->klass_at(i, CHECK); 1817 if (klass->oop_is_instance()) { 1818 // Force initialization of class 1819 InstanceKlass::cast(klass)->initialize(CHECK); 1820 } 1821 } 1822 } 1823 } 1824 1825 #endif 1826 1827 1828 // Printing 1829 1830 void ConstantPool::print_on(outputStream* st) const { 1831 EXCEPTION_MARK; 1832 assert(is_constantPool(), "must be constantPool"); 1833 st->print_cr(internal_name()); 1834 if (flags() != 0) { 1835 st->print(" - flags: 0x%x", flags()); 1836 if (has_pseudo_string()) st->print(" has_pseudo_string"); 1837 if (has_invokedynamic()) st->print(" has_invokedynamic"); 1838 if (has_preresolution()) st->print(" has_preresolution"); 1839 st->cr(); 1840 } 1841 if (pool_holder() != NULL) { 1842 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder()); 1843 } 1844 st->print_cr(" - cache: " INTPTR_FORMAT, cache()); 1845 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references()); 1846 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map()); 1847 1848 for (int index = 1; index < length(); index++) { // Index 0 is unused 1849 ((ConstantPool*)this)->print_entry_on(index, st); 1850 switch (tag_at(index).value()) { 1851 case JVM_CONSTANT_Long : 1852 case JVM_CONSTANT_Double : 1853 index++; // Skip entry following eigth-byte constant 1854 } 1855 1856 } 1857 st->cr(); 1858 } 1859 1860 // Print one constant pool entry 1861 void ConstantPool::print_entry_on(const int index, outputStream* st) { 1862 EXCEPTION_MARK; 1863 st->print(" - %3d : ", index); 1864 tag_at(index).print_on(st); 1865 st->print(" : "); 1866 switch (tag_at(index).value()) { 1867 case JVM_CONSTANT_Class : 1868 { Klass* k = klass_at(index, CATCH); 1869 k->print_value_on(st); 1870 st->print(" {0x%lx}", (address)k); 1871 } 1872 break; 1873 case JVM_CONSTANT_Fieldref : 1874 case JVM_CONSTANT_Methodref : 1875 case JVM_CONSTANT_InterfaceMethodref : 1876 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); 1877 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); 1878 break; 1879 case JVM_CONSTANT_String : 1880 unresolved_string_at(index)->print_value_on(st); 1881 break; 1882 case JVM_CONSTANT_Object : { 1883 oop anObj = object_at(index); 1884 anObj->print_value_on(st); 1885 st->print(" {0x%lx}", (address)anObj); 1886 } break; 1887 case JVM_CONSTANT_Integer : 1888 st->print("%d", int_at(index)); 1889 break; 1890 case JVM_CONSTANT_Float : 1891 st->print("%f", float_at(index)); 1892 break; 1893 case JVM_CONSTANT_Long : 1894 st->print_jlong(long_at(index)); 1895 break; 1896 case JVM_CONSTANT_Double : 1897 st->print("%lf", double_at(index)); 1898 break; 1899 case JVM_CONSTANT_NameAndType : 1900 st->print("name_index=%d", name_ref_index_at(index)); 1901 st->print(" signature_index=%d", signature_ref_index_at(index)); 1902 break; 1903 case JVM_CONSTANT_Utf8 : 1904 symbol_at(index)->print_value_on(st); 1905 break; 1906 case JVM_CONSTANT_UnresolvedClass : // fall-through 1907 case JVM_CONSTANT_UnresolvedClassInError: { 1908 // unresolved_klass_at requires lock or safe world. 1909 CPSlot entry = slot_at(index); 1910 if (entry.is_resolved()) { 1911 entry.get_klass()->print_value_on(st); 1912 } else { 1913 entry.get_symbol()->print_value_on(st); 1914 } 1915 } 1916 break; 1917 case JVM_CONSTANT_MethodHandle : 1918 case JVM_CONSTANT_MethodHandleInError : 1919 st->print("ref_kind=%d", method_handle_ref_kind_at(index)); 1920 st->print(" ref_index=%d", method_handle_index_at(index)); 1921 break; 1922 case JVM_CONSTANT_MethodType : 1923 case JVM_CONSTANT_MethodTypeInError : 1924 st->print("signature_index=%d", method_type_index_at(index)); 1925 break; 1926 case JVM_CONSTANT_InvokeDynamic : 1927 { 1928 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); 1929 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); 1930 int argc = invoke_dynamic_argument_count_at(index); 1931 if (argc > 0) { 1932 for (int arg_i = 0; arg_i < argc; arg_i++) { 1933 int arg = invoke_dynamic_argument_index_at(index, arg_i); 1934 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 1935 } 1936 st->print("}"); 1937 } 1938 } 1939 break; 1940 default: 1941 ShouldNotReachHere(); 1942 break; 1943 } 1944 st->cr(); 1945 } 1946 1947 void ConstantPool::print_value_on(outputStream* st) const { 1948 assert(is_constantPool(), "must be constantPool"); 1949 st->print("constant pool [%d]", length()); 1950 if (has_pseudo_string()) st->print("/pseudo_string"); 1951 if (has_invokedynamic()) st->print("/invokedynamic"); 1952 if (has_preresolution()) st->print("/preresolution"); 1953 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); 1954 print_address_on(st); 1955 st->print(" for "); 1956 pool_holder()->print_value_on(st); 1957 if (pool_holder() != NULL) { 1958 bool extra = (pool_holder()->constants() != this); 1959 if (extra) st->print(" (extra)"); 1960 } 1961 if (cache() != NULL) { 1962 st->print(" cache=" PTR_FORMAT, cache()); 1963 } 1964 } 1965 1966 1967 // Verification 1968 1969 void ConstantPool::verify_on(outputStream* st) { 1970 guarantee(is_constantPool(), "object must be constant pool"); 1971 for (int i = 0; i< length(); i++) { 1972 constantTag tag = tag_at(i); 1973 CPSlot entry = slot_at(i); 1974 if (tag.is_klass()) { 1975 if (entry.is_resolved()) { 1976 guarantee(entry.get_klass()->is_metadata(), "should be metadata"); 1977 guarantee(entry.get_klass()->is_klass(), "should be klass"); 1978 } 1979 } else if (tag.is_unresolved_klass()) { 1980 if (entry.is_resolved()) { 1981 guarantee(entry.get_klass()->is_metadata(), "should be metadata"); 1982 guarantee(entry.get_klass()->is_klass(), "should be klass"); 1983 } 1984 } else if (tag.is_symbol()) { 1985 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 1986 } else if (tag.is_string()) { 1987 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 1988 } 1989 } 1990 if (cache() != NULL) { 1991 // Note: cache() can be NULL before a class is completely setup or 1992 // in temporary constant pools used during constant pool merging 1993 guarantee(cache()->is_metadata(), "should be metadata"); 1994 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); 1995 } 1996 if (pool_holder() != NULL) { 1997 // Note: pool_holder() can be NULL in temporary constant pools 1998 // used during constant pool merging 1999 guarantee(pool_holder()->is_metadata(), "should be metadata"); 2000 guarantee(pool_holder()->is_klass(), "should be klass"); 2001 } 2002 } 2003 2004 2005 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { 2006 char *str = sym->as_utf8(); 2007 unsigned int hash = compute_hash(str, sym->utf8_length()); 2008 unsigned int index = hash % table_size(); 2009 2010 // check if already in map 2011 // we prefer the first entry since it is more likely to be what was used in 2012 // the class file 2013 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2014 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2015 if (en->hash() == hash && en->symbol() == sym) { 2016 return; // already there 2017 } 2018 } 2019 2020 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); 2021 entry->set_next(bucket(index)); 2022 _buckets[index].set_entry(entry); 2023 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2024 } 2025 2026 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { 2027 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); 2028 char *str = sym->as_utf8(); 2029 int len = sym->utf8_length(); 2030 unsigned int hash = SymbolHashMap::compute_hash(str, len); 2031 unsigned int index = hash % table_size(); 2032 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2033 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2034 if (en->hash() == hash && en->symbol() == sym) { 2035 return en; 2036 } 2037 } 2038 return NULL; 2039 }