1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoaderData.hpp" 27 #include "classfile/javaClasses.inline.hpp" 28 #include "classfile/metadataOnStackMark.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "interpreter/linkResolver.hpp" 33 #include "memory/heapInspection.hpp" 34 #include "memory/metadataFactory.hpp" 35 #include "memory/oopFactory.hpp" 36 #include "memory/resourceArea.hpp" 37 #include "oops/constantPool.hpp" 38 #include "oops/instanceKlass.hpp" 39 #include "oops/objArrayKlass.hpp" 40 #include "oops/objArrayOop.inline.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "runtime/fieldType.hpp" 43 #include "runtime/init.hpp" 44 #include "runtime/javaCalls.hpp" 45 #include "runtime/signature.hpp" 46 #include "runtime/vframe.hpp" 47 #include "utilities/copy.hpp" 48 49 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { 50 // Tags are RW but comment below applies to tags also. 51 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); 52 53 int size = ConstantPool::size(length); 54 55 // CDS considerations: 56 // Allocate read-write but may be able to move to read-only at dumping time 57 // if all the klasses are resolved. The only other field that is writable is 58 // the resolved_references array, which is recreated at startup time. 59 // But that could be moved to InstanceKlass (although a pain to access from 60 // assembly code). Maybe it could be moved to the cpCache which is RW. 61 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); 62 } 63 64 #ifdef ASSERT 65 66 // MetaspaceObj allocation invariant is calloc equivalent memory 67 // simple verification of this here (JVM_CONSTANT_Invalid == 0 ) 68 static bool tag_array_is_zero_initialized(Array<u1>* tags) { 69 assert(tags != NULL, "invariant"); 70 const int length = tags->length(); 71 for (int index = 0; index < length; ++index) { 72 if (JVM_CONSTANT_Invalid != tags->at(index)) { 73 return false; 74 } 75 } 76 return true; 77 } 78 79 #endif 80 81 ConstantPool::ConstantPool(Array<u1>* tags) : 82 _tags(tags), 83 _length(tags->length()), 84 _flags(0) { 85 86 assert(_tags != NULL, "invariant"); 87 assert(tags->length() == _length, "invariant"); 88 assert(tag_array_is_zero_initialized(tags), "invariant"); 89 assert(0 == _flags, "invariant"); 90 assert(0 == version(), "invariant"); 91 assert(NULL == _pool_holder, "invariant"); 92 } 93 94 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { 95 MetadataFactory::free_metadata(loader_data, cache()); 96 set_cache(NULL); 97 MetadataFactory::free_array<u2>(loader_data, reference_map()); 98 set_reference_map(NULL); 99 100 MetadataFactory::free_array<jushort>(loader_data, operands()); 101 set_operands(NULL); 102 103 release_C_heap_structures(); 104 105 // free tag array 106 MetadataFactory::free_array<u1>(loader_data, tags()); 107 set_tags(NULL); 108 } 109 110 void ConstantPool::release_C_heap_structures() { 111 // walk constant pool and decrement symbol reference counts 112 unreference_symbols(); 113 } 114 115 objArrayOop ConstantPool::resolved_references() const { 116 return (objArrayOop)JNIHandles::resolve(_resolved_references); 117 } 118 119 // Create resolved_references array and mapping array for original cp indexes 120 // The ldc bytecode was rewritten to have the resolved reference array index so need a way 121 // to map it back for resolving and some unlikely miscellaneous uses. 122 // The objects created by invokedynamic are appended to this list. 123 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, 124 const intStack& reference_map, 125 int constant_pool_map_length, 126 TRAPS) { 127 // Initialized the resolved object cache. 128 int map_length = reference_map.length(); 129 if (map_length > 0) { 130 // Only need mapping back to constant pool entries. The map isn't used for 131 // invokedynamic resolved_reference entries. For invokedynamic entries, 132 // the constant pool cache index has the mapping back to both the constant 133 // pool and to the resolved reference index. 134 if (constant_pool_map_length > 0) { 135 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK); 136 137 for (int i = 0; i < constant_pool_map_length; i++) { 138 int x = reference_map.at(i); 139 assert(x == (int)(jushort) x, "klass index is too big"); 140 om->at_put(i, (jushort)x); 141 } 142 set_reference_map(om); 143 } 144 145 // Create Java array for holding resolved strings, methodHandles, 146 // methodTypes, invokedynamic and invokehandle appendix objects, etc. 147 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 148 Handle refs_handle (THREAD, (oop)stom); // must handleize. 149 set_resolved_references(loader_data->add_handle(refs_handle)); 150 } 151 } 152 153 // CDS support. Create a new resolved_references array. 154 void ConstantPool::restore_unshareable_info(TRAPS) { 155 assert(is_constantPool(), "ensure C++ vtable is restored"); 156 157 // Only create the new resolved references array if it hasn't been attempted before 158 if (resolved_references() != NULL) return; 159 160 // restore the C++ vtable from the shared archive 161 restore_vtable(); 162 163 if (SystemDictionary::Object_klass_loaded()) { 164 // Recreate the object array and add to ClassLoaderData. 165 int map_length = resolved_reference_length(); 166 if (map_length > 0) { 167 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 168 Handle refs_handle (THREAD, (oop)stom); // must handleize. 169 170 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 171 set_resolved_references(loader_data->add_handle(refs_handle)); 172 } 173 } 174 } 175 176 void ConstantPool::remove_unshareable_info() { 177 // Resolved references are not in the shared archive. 178 // Save the length for restoration. It is not necessarily the same length 179 // as reference_map.length() if invokedynamic is saved. 180 set_resolved_reference_length( 181 resolved_references() != NULL ? resolved_references()->length() : 0); 182 set_resolved_references(NULL); 183 } 184 185 int ConstantPool::cp_to_object_index(int cp_index) { 186 // this is harder don't do this so much. 187 int i = reference_map()->find(cp_index); 188 // We might not find the index for jsr292 call. 189 return (i < 0) ? _no_index_sentinel : i; 190 } 191 192 void ConstantPool::string_at_put(int which, int obj_index, oop str) { 193 resolved_references()->obj_at_put(obj_index, str); 194 } 195 196 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) { 197 ResourceMark rm; 198 int line_number = -1; 199 const char * source_file = NULL; 200 if (JavaThread::current()->has_last_Java_frame()) { 201 // try to identify the method which called this function. 202 vframeStream vfst(JavaThread::current()); 203 if (!vfst.at_end()) { 204 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 205 Symbol* s = vfst.method()->method_holder()->source_file_name(); 206 if (s != NULL) { 207 source_file = s->as_C_string(); 208 } 209 } 210 } 211 if (k != this_cp->pool_holder()) { 212 // only print something if the classes are different 213 if (source_file != NULL) { 214 log_debug(class, resolve)("%s %s %s:%d", 215 this_cp->pool_holder()->external_name(), 216 k->external_name(), source_file, line_number); 217 } else { 218 log_debug(class, resolve)("%s %s", 219 this_cp->pool_holder()->external_name(), 220 k->external_name()); 221 } 222 } 223 } 224 225 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which, 226 bool save_resolution_error, TRAPS) { 227 assert(THREAD->is_Java_thread(), "must be a Java thread"); 228 229 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 230 // It is not safe to rely on the tag bit's here, since we don't have a lock, and 231 // the entry and tag is not updated atomicly. 232 CPSlot entry = this_cp->slot_at(which); 233 if (entry.is_resolved()) { 234 assert(entry.get_klass()->is_klass(), "must be"); 235 // Already resolved - return entry. 236 return entry.get_klass(); 237 } 238 239 // This tag doesn't change back to unresolved class unless at a safepoint. 240 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) { 241 // The original attempt to resolve this constant pool entry failed so find the 242 // class of the original error and throw another error of the same class 243 // (JVMS 5.4.3). 244 // If there is a detail message, pass that detail message to the error. 245 // The JVMS does not strictly require us to duplicate the same detail message, 246 // or any internal exception fields such as cause or stacktrace. But since the 247 // detail message is often a class name or other literal string, we will repeat it 248 // if we can find it in the symbol table. 249 throw_resolution_error(this_cp, which, CHECK_0); 250 ShouldNotReachHere(); 251 } 252 253 Handle mirror_handle; 254 Symbol* name = entry.get_symbol(); 255 Handle loader (THREAD, this_cp->pool_holder()->class_loader()); 256 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain()); 257 Klass* k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD); 258 if (!HAS_PENDING_EXCEPTION) { 259 // preserve the resolved klass from unloading 260 mirror_handle = Handle(THREAD, k->java_mirror()); 261 // Do access check for klasses 262 verify_constant_pool_resolve(this_cp, k, THREAD); 263 } 264 265 // Failed to resolve class. We must record the errors so that subsequent attempts 266 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). 267 if (HAS_PENDING_EXCEPTION) { 268 if (save_resolution_error) { 269 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL); 270 // If CHECK_NULL above doesn't return the exception, that means that 271 // some other thread has beaten us and has resolved the class. 272 // To preserve old behavior, we return the resolved class. 273 entry = this_cp->resolved_klass_at(which); 274 assert(entry.is_resolved(), "must be resolved if exception was cleared"); 275 assert(entry.get_klass()->is_klass(), "must be resolved to a klass"); 276 return entry.get_klass(); 277 } else { 278 return NULL; // return the pending exception 279 } 280 } 281 282 // Make this class loader depend upon the class loader owning the class reference 283 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data(); 284 this_key->record_dependency(k, CHECK_NULL); // Can throw OOM 285 286 // logging for class+resolve. 287 if (log_is_enabled(Debug, class, resolve)){ 288 trace_class_resolution(this_cp, k); 289 } 290 this_cp->klass_at_put(which, k); 291 entry = this_cp->resolved_klass_at(which); 292 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); 293 return entry.get_klass(); 294 } 295 296 297 // Does not update ConstantPool* - to avoid any exception throwing. Used 298 // by compiler and exception handling. Also used to avoid classloads for 299 // instanceof operations. Returns NULL if the class has not been loaded or 300 // if the verification of constant pool failed 301 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) { 302 CPSlot entry = this_cp->slot_at(which); 303 if (entry.is_resolved()) { 304 assert(entry.get_klass()->is_klass(), "must be"); 305 return entry.get_klass(); 306 } else { 307 assert(entry.is_unresolved(), "must be either symbol or klass"); 308 Thread *thread = Thread::current(); 309 Symbol* name = entry.get_symbol(); 310 oop loader = this_cp->pool_holder()->class_loader(); 311 oop protection_domain = this_cp->pool_holder()->protection_domain(); 312 Handle h_prot (thread, protection_domain); 313 Handle h_loader (thread, loader); 314 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); 315 316 if (k != NULL) { 317 // Make sure that resolving is legal 318 EXCEPTION_MARK; 319 // return NULL if verification fails 320 verify_constant_pool_resolve(this_cp, k, THREAD); 321 if (HAS_PENDING_EXCEPTION) { 322 CLEAR_PENDING_EXCEPTION; 323 return NULL; 324 } 325 return k; 326 } else { 327 return k; 328 } 329 } 330 } 331 332 333 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) { 334 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which)); 335 } 336 337 338 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool, 339 int which) { 340 if (cpool->cache() == NULL) return NULL; // nothing to load yet 341 int cache_index = decode_cpcache_index(which, true); 342 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { 343 // FIXME: should be an assert 344 log_debug(class, resolve)("bad operand %d in:", which); cpool->print(); 345 return NULL; 346 } 347 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 348 return e->method_if_resolved(cpool); 349 } 350 351 352 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 353 if (cpool->cache() == NULL) return false; // nothing to load yet 354 int cache_index = decode_cpcache_index(which, true); 355 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 356 return e->has_appendix(); 357 } 358 359 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 360 if (cpool->cache() == NULL) return NULL; // nothing to load yet 361 int cache_index = decode_cpcache_index(which, true); 362 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 363 return e->appendix_if_resolved(cpool); 364 } 365 366 367 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) { 368 if (cpool->cache() == NULL) return false; // nothing to load yet 369 int cache_index = decode_cpcache_index(which, true); 370 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 371 return e->has_method_type(); 372 } 373 374 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) { 375 if (cpool->cache() == NULL) return NULL; // nothing to load yet 376 int cache_index = decode_cpcache_index(which, true); 377 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 378 return e->method_type_if_resolved(cpool); 379 } 380 381 382 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { 383 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 384 return symbol_at(name_index); 385 } 386 387 388 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { 389 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 390 return symbol_at(signature_index); 391 } 392 393 394 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { 395 int i = which; 396 if (!uncached && cache() != NULL) { 397 if (ConstantPool::is_invokedynamic_index(which)) { 398 // Invokedynamic index is index into the constant pool cache 399 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); 400 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); 401 assert(tag_at(pool_index).is_name_and_type(), ""); 402 return pool_index; 403 } 404 // change byte-ordering and go via cache 405 i = remap_instruction_operand_from_cache(which); 406 } else { 407 if (tag_at(which).is_invoke_dynamic()) { 408 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); 409 assert(tag_at(pool_index).is_name_and_type(), ""); 410 return pool_index; 411 } 412 } 413 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 414 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); 415 jint ref_index = *int_at_addr(i); 416 return extract_high_short_from_int(ref_index); 417 } 418 419 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) { 420 int pool_index = which; 421 if (!uncached && cache() != NULL) { 422 if (ConstantPool::is_invokedynamic_index(which)) { 423 // Invokedynamic index is index into resolved_references 424 pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); 425 } else { 426 // change byte-ordering and go via cache 427 pool_index = remap_instruction_operand_from_cache(which); 428 } 429 } 430 return tag_at(pool_index); 431 } 432 433 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { 434 guarantee(!ConstantPool::is_invokedynamic_index(which), 435 "an invokedynamic instruction does not have a klass"); 436 int i = which; 437 if (!uncached && cache() != NULL) { 438 // change byte-ordering and go via cache 439 i = remap_instruction_operand_from_cache(which); 440 } 441 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 442 jint ref_index = *int_at_addr(i); 443 return extract_low_short_from_int(ref_index); 444 } 445 446 447 448 int ConstantPool::remap_instruction_operand_from_cache(int operand) { 449 int cpc_index = operand; 450 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); 451 assert((int)(u2)cpc_index == cpc_index, "clean u2"); 452 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); 453 return member_index; 454 } 455 456 457 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) { 458 if (k->is_instance_klass() || k->is_objArray_klass()) { 459 InstanceKlass* holder = this_cp->pool_holder(); 460 Klass* elem = k->is_instance_klass() ? k : ObjArrayKlass::cast(k)->bottom_klass(); 461 462 // The element type could be a typeArray - we only need the access check if it is 463 // an reference to another class 464 if (elem->is_instance_klass()) { 465 LinkResolver::check_klass_accessability(holder, elem, CHECK); 466 } 467 } 468 } 469 470 471 int ConstantPool::name_ref_index_at(int which_nt) { 472 jint ref_index = name_and_type_at(which_nt); 473 return extract_low_short_from_int(ref_index); 474 } 475 476 477 int ConstantPool::signature_ref_index_at(int which_nt) { 478 jint ref_index = name_and_type_at(which_nt); 479 return extract_high_short_from_int(ref_index); 480 } 481 482 483 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { 484 return klass_at(klass_ref_index_at(which), THREAD); 485 } 486 487 488 Symbol* ConstantPool::klass_name_at(int which) const { 489 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), 490 "Corrupted constant pool"); 491 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 492 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and 493 // tag is not updated atomicly. 494 CPSlot entry = slot_at(which); 495 if (entry.is_resolved()) { 496 // Already resolved - return entry's name. 497 assert(entry.get_klass()->is_klass(), "must be"); 498 return entry.get_klass()->name(); 499 } else { 500 assert(entry.is_unresolved(), "must be either symbol or klass"); 501 return entry.get_symbol(); 502 } 503 } 504 505 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { 506 jint ref_index = klass_ref_index_at(which); 507 return klass_at_noresolve(ref_index); 508 } 509 510 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { 511 jint ref_index = uncached_klass_ref_index_at(which); 512 return klass_at_noresolve(ref_index); 513 } 514 515 char* ConstantPool::string_at_noresolve(int which) { 516 return unresolved_string_at(which)->as_C_string(); 517 } 518 519 BasicType ConstantPool::basic_type_for_signature_at(int which) const { 520 return FieldType::basic_type(symbol_at(which)); 521 } 522 523 524 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) { 525 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused 526 if (this_cp->tag_at(index).is_string()) { 527 this_cp->string_at(index, CHECK); 528 } 529 } 530 } 531 532 // Resolve all the classes in the constant pool. If they are all resolved, 533 // the constant pool is read-only. Enhancement: allocate cp entries to 534 // another metaspace, and copy to read-only or read-write space if this 535 // bit is set. 536 bool ConstantPool::resolve_class_constants(TRAPS) { 537 constantPoolHandle cp(THREAD, this); 538 for (int index = 1; index < length(); index++) { // Index 0 is unused 539 if (tag_at(index).is_unresolved_klass() && 540 klass_at_if_loaded(cp, index) == NULL) { 541 return false; 542 } 543 } 544 // set_preresolution(); or some bit for future use 545 return true; 546 } 547 548 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) { 549 // Dig out the detailed message to reuse if possible 550 Symbol* message = java_lang_Throwable::detail_message(pending_exception); 551 if (message != NULL) { 552 return message; 553 } 554 555 // Return specific message for the tag 556 switch (tag.value()) { 557 case JVM_CONSTANT_UnresolvedClass: 558 // return the class name in the error message 559 message = this_cp->klass_name_at(which); 560 break; 561 case JVM_CONSTANT_MethodHandle: 562 // return the method handle name in the error message 563 message = this_cp->method_handle_name_ref_at(which); 564 break; 565 case JVM_CONSTANT_MethodType: 566 // return the method type signature in the error message 567 message = this_cp->method_type_signature_at(which); 568 break; 569 default: 570 ShouldNotReachHere(); 571 } 572 573 return message; 574 } 575 576 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) { 577 Symbol* message = NULL; 578 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message); 579 assert(error != NULL && message != NULL, "checking"); 580 CLEAR_PENDING_EXCEPTION; 581 ResourceMark rm; 582 THROW_MSG(error, message->as_C_string()); 583 } 584 585 // If resolution for Class, MethodHandle or MethodType fails, save the exception 586 // in the resolution error table, so that the same exception is thrown again. 587 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which, 588 constantTag tag, TRAPS) { 589 Symbol* error = PENDING_EXCEPTION->klass()->name(); 590 591 int error_tag = tag.error_value(); 592 593 if (!PENDING_EXCEPTION-> 594 is_a(SystemDictionary::LinkageError_klass())) { 595 // Just throw the exception and don't prevent these classes from 596 // being loaded due to virtual machine errors like StackOverflow 597 // and OutOfMemoryError, etc, or if the thread was hit by stop() 598 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 599 } else if (this_cp->tag_at(which).value() != error_tag) { 600 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION); 601 SystemDictionary::add_resolution_error(this_cp, which, error, message); 602 // CAS in the tag. If a thread beat us to registering this error that's fine. 603 // If another thread resolved the reference, this is a race condition. This 604 // thread may have had a security manager or something temporary. 605 // This doesn't deterministically get an error. So why do we save this? 606 // We save this because jvmti can add classes to the bootclass path after 607 // this error, so it needs to get the same error if the error is first. 608 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag, 609 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value()); 610 if (old_tag != error_tag && old_tag != tag.value()) { 611 // MethodHandles and MethodType doesn't change to resolved version. 612 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value"); 613 // Forget the exception and use the resolved class. 614 CLEAR_PENDING_EXCEPTION; 615 } 616 } else { 617 // some other thread put this in error state 618 throw_resolution_error(this_cp, which, CHECK); 619 } 620 } 621 622 // Called to resolve constants in the constant pool and return an oop. 623 // Some constant pool entries cache their resolved oop. This is also 624 // called to create oops from constants to use in arguments for invokedynamic 625 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) { 626 oop result_oop = NULL; 627 Handle throw_exception; 628 629 if (cache_index == _possible_index_sentinel) { 630 // It is possible that this constant is one which is cached in the objects. 631 // We'll do a linear search. This should be OK because this usage is rare. 632 assert(index > 0, "valid index"); 633 cache_index = this_cp->cp_to_object_index(index); 634 } 635 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); 636 assert(index == _no_index_sentinel || index >= 0, ""); 637 638 if (cache_index >= 0) { 639 result_oop = this_cp->resolved_references()->obj_at(cache_index); 640 if (result_oop != NULL) { 641 return result_oop; 642 // That was easy... 643 } 644 index = this_cp->object_to_cp_index(cache_index); 645 } 646 647 jvalue prim_value; // temp used only in a few cases below 648 649 constantTag tag = this_cp->tag_at(index); 650 651 switch (tag.value()) { 652 653 case JVM_CONSTANT_UnresolvedClass: 654 case JVM_CONSTANT_UnresolvedClassInError: 655 case JVM_CONSTANT_Class: 656 { 657 assert(cache_index == _no_index_sentinel, "should not have been set"); 658 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL); 659 // ldc wants the java mirror. 660 result_oop = resolved->java_mirror(); 661 break; 662 } 663 664 case JVM_CONSTANT_String: 665 assert(cache_index != _no_index_sentinel, "should have been set"); 666 if (this_cp->is_pseudo_string_at(index)) { 667 result_oop = this_cp->pseudo_string_at(index, cache_index); 668 break; 669 } 670 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL); 671 break; 672 673 case JVM_CONSTANT_MethodHandleInError: 674 case JVM_CONSTANT_MethodTypeInError: 675 { 676 throw_resolution_error(this_cp, index, CHECK_NULL); 677 break; 678 } 679 680 case JVM_CONSTANT_MethodHandle: 681 { 682 int ref_kind = this_cp->method_handle_ref_kind_at(index); 683 int callee_index = this_cp->method_handle_klass_index_at(index); 684 Symbol* name = this_cp->method_handle_name_ref_at(index); 685 Symbol* signature = this_cp->method_handle_signature_ref_at(index); 686 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index)); 687 { ResourceMark rm(THREAD); 688 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", 689 ref_kind, index, this_cp->method_handle_index_at(index), 690 callee_index, name->as_C_string(), signature->as_C_string()); 691 } 692 693 Klass* callee = klass_at_impl(this_cp, callee_index, true, CHECK_NULL); 694 695 // Check constant pool method consistency 696 if ((callee->is_interface() && m_tag.is_method()) || 697 ((!callee->is_interface() && m_tag.is_interface_method()))) { 698 ResourceMark rm(THREAD); 699 char buf[400]; 700 jio_snprintf(buf, sizeof(buf), 701 "Inconsistent constant pool data in classfile for class %s. " 702 "Method %s%s at index %d is %s and should be %s", 703 callee->name()->as_C_string(), name->as_C_string(), signature->as_C_string(), index, 704 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef", 705 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef"); 706 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 707 } 708 709 Klass* klass = this_cp->pool_holder(); 710 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, 711 callee, name, signature, 712 THREAD); 713 result_oop = value(); 714 if (HAS_PENDING_EXCEPTION) { 715 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 716 } 717 break; 718 } 719 720 case JVM_CONSTANT_MethodType: 721 { 722 Symbol* signature = this_cp->method_type_signature_at(index); 723 { ResourceMark rm(THREAD); 724 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s", 725 index, this_cp->method_type_index_at(index), 726 signature->as_C_string()); 727 } 728 Klass* klass = this_cp->pool_holder(); 729 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); 730 result_oop = value(); 731 if (HAS_PENDING_EXCEPTION) { 732 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 733 } 734 break; 735 } 736 737 case JVM_CONSTANT_Integer: 738 assert(cache_index == _no_index_sentinel, "should not have been set"); 739 prim_value.i = this_cp->int_at(index); 740 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); 741 break; 742 743 case JVM_CONSTANT_Float: 744 assert(cache_index == _no_index_sentinel, "should not have been set"); 745 prim_value.f = this_cp->float_at(index); 746 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); 747 break; 748 749 case JVM_CONSTANT_Long: 750 assert(cache_index == _no_index_sentinel, "should not have been set"); 751 prim_value.j = this_cp->long_at(index); 752 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); 753 break; 754 755 case JVM_CONSTANT_Double: 756 assert(cache_index == _no_index_sentinel, "should not have been set"); 757 prim_value.d = this_cp->double_at(index); 758 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); 759 break; 760 761 default: 762 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", 763 this_cp(), index, cache_index, tag.value())); 764 assert(false, "unexpected constant tag"); 765 break; 766 } 767 768 if (cache_index >= 0) { 769 // Benign race condition: resolved_references may already be filled in. 770 // The important thing here is that all threads pick up the same result. 771 // It doesn't matter which racing thread wins, as long as only one 772 // result is used by all threads, and all future queries. 773 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL); 774 if (old_result == NULL) { 775 return result_oop; // was installed 776 } else { 777 // Return the winning thread's result. This can be different than 778 // the result here for MethodHandles. 779 return old_result; 780 } 781 } else { 782 return result_oop; 783 } 784 } 785 786 oop ConstantPool::uncached_string_at(int which, TRAPS) { 787 Symbol* sym = unresolved_string_at(which); 788 oop str = StringTable::intern(sym, CHECK_(NULL)); 789 assert(java_lang_String::is_instance(str), "must be string"); 790 return str; 791 } 792 793 794 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) { 795 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); 796 797 Handle bsm; 798 int argc; 799 { 800 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments 801 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. 802 // It is accompanied by the optional arguments. 803 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index); 804 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); 805 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { 806 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); 807 } 808 809 // Extract the optional static arguments. 810 argc = this_cp->invoke_dynamic_argument_count_at(index); 811 if (argc == 0) return bsm_oop; 812 813 bsm = Handle(THREAD, bsm_oop); 814 } 815 816 objArrayHandle info; 817 { 818 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); 819 info = objArrayHandle(THREAD, info_oop); 820 } 821 822 info->obj_at_put(0, bsm()); 823 for (int i = 0; i < argc; i++) { 824 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i); 825 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); 826 info->obj_at_put(1+i, arg_oop); 827 } 828 829 return info(); 830 } 831 832 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) { 833 // If the string has already been interned, this entry will be non-null 834 oop str = this_cp->resolved_references()->obj_at(obj_index); 835 if (str != NULL) return str; 836 Symbol* sym = this_cp->unresolved_string_at(which); 837 str = StringTable::intern(sym, CHECK_(NULL)); 838 this_cp->string_at_put(which, obj_index, str); 839 assert(java_lang_String::is_instance(str), "must be string"); 840 return str; 841 } 842 843 844 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) { 845 // Names are interned, so we can compare Symbol*s directly 846 Symbol* cp_name = klass_name_at(which); 847 return (cp_name == k->name()); 848 } 849 850 851 // Iterate over symbols and decrement ones which are Symbol*s 852 // This is done during GC. 853 // Only decrement the UTF8 symbols. Unresolved classes and strings point to 854 // these symbols but didn't increment the reference count. 855 void ConstantPool::unreference_symbols() { 856 for (int index = 1; index < length(); index++) { // Index 0 is unused 857 constantTag tag = tag_at(index); 858 if (tag.is_symbol()) { 859 symbol_at(index)->decrement_refcount(); 860 } 861 } 862 } 863 864 865 // Compare this constant pool's entry at index1 to the constant pool 866 // cp2's entry at index2. 867 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2, 868 int index2, TRAPS) { 869 870 // The error tags are equivalent to non-error tags when comparing 871 jbyte t1 = tag_at(index1).non_error_value(); 872 jbyte t2 = cp2->tag_at(index2).non_error_value(); 873 874 if (t1 != t2) { 875 // Not the same entry type so there is nothing else to check. Note 876 // that this style of checking will consider resolved/unresolved 877 // class pairs as different. 878 // From the ConstantPool* API point of view, this is correct 879 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this 880 // plays out in the context of ConstantPool* merging. 881 return false; 882 } 883 884 switch (t1) { 885 case JVM_CONSTANT_Class: 886 { 887 Klass* k1 = klass_at(index1, CHECK_false); 888 Klass* k2 = cp2->klass_at(index2, CHECK_false); 889 if (k1 == k2) { 890 return true; 891 } 892 } break; 893 894 case JVM_CONSTANT_ClassIndex: 895 { 896 int recur1 = klass_index_at(index1); 897 int recur2 = cp2->klass_index_at(index2); 898 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 899 if (match) { 900 return true; 901 } 902 } break; 903 904 case JVM_CONSTANT_Double: 905 { 906 jdouble d1 = double_at(index1); 907 jdouble d2 = cp2->double_at(index2); 908 if (d1 == d2) { 909 return true; 910 } 911 } break; 912 913 case JVM_CONSTANT_Fieldref: 914 case JVM_CONSTANT_InterfaceMethodref: 915 case JVM_CONSTANT_Methodref: 916 { 917 int recur1 = uncached_klass_ref_index_at(index1); 918 int recur2 = cp2->uncached_klass_ref_index_at(index2); 919 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 920 if (match) { 921 recur1 = uncached_name_and_type_ref_index_at(index1); 922 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); 923 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 924 if (match) { 925 return true; 926 } 927 } 928 } break; 929 930 case JVM_CONSTANT_Float: 931 { 932 jfloat f1 = float_at(index1); 933 jfloat f2 = cp2->float_at(index2); 934 if (f1 == f2) { 935 return true; 936 } 937 } break; 938 939 case JVM_CONSTANT_Integer: 940 { 941 jint i1 = int_at(index1); 942 jint i2 = cp2->int_at(index2); 943 if (i1 == i2) { 944 return true; 945 } 946 } break; 947 948 case JVM_CONSTANT_Long: 949 { 950 jlong l1 = long_at(index1); 951 jlong l2 = cp2->long_at(index2); 952 if (l1 == l2) { 953 return true; 954 } 955 } break; 956 957 case JVM_CONSTANT_NameAndType: 958 { 959 int recur1 = name_ref_index_at(index1); 960 int recur2 = cp2->name_ref_index_at(index2); 961 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 962 if (match) { 963 recur1 = signature_ref_index_at(index1); 964 recur2 = cp2->signature_ref_index_at(index2); 965 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 966 if (match) { 967 return true; 968 } 969 } 970 } break; 971 972 case JVM_CONSTANT_StringIndex: 973 { 974 int recur1 = string_index_at(index1); 975 int recur2 = cp2->string_index_at(index2); 976 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 977 if (match) { 978 return true; 979 } 980 } break; 981 982 case JVM_CONSTANT_UnresolvedClass: 983 { 984 Symbol* k1 = klass_name_at(index1); 985 Symbol* k2 = cp2->klass_name_at(index2); 986 if (k1 == k2) { 987 return true; 988 } 989 } break; 990 991 case JVM_CONSTANT_MethodType: 992 { 993 int k1 = method_type_index_at(index1); 994 int k2 = cp2->method_type_index_at(index2); 995 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 996 if (match) { 997 return true; 998 } 999 } break; 1000 1001 case JVM_CONSTANT_MethodHandle: 1002 { 1003 int k1 = method_handle_ref_kind_at(index1); 1004 int k2 = cp2->method_handle_ref_kind_at(index2); 1005 if (k1 == k2) { 1006 int i1 = method_handle_index_at(index1); 1007 int i2 = cp2->method_handle_index_at(index2); 1008 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); 1009 if (match) { 1010 return true; 1011 } 1012 } 1013 } break; 1014 1015 case JVM_CONSTANT_InvokeDynamic: 1016 { 1017 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); 1018 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); 1019 int i1 = invoke_dynamic_bootstrap_specifier_index(index1); 1020 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); 1021 // separate statements and variables because CHECK_false is used 1022 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); 1023 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); 1024 return (match_entry && match_operand); 1025 } break; 1026 1027 case JVM_CONSTANT_String: 1028 { 1029 Symbol* s1 = unresolved_string_at(index1); 1030 Symbol* s2 = cp2->unresolved_string_at(index2); 1031 if (s1 == s2) { 1032 return true; 1033 } 1034 } break; 1035 1036 case JVM_CONSTANT_Utf8: 1037 { 1038 Symbol* s1 = symbol_at(index1); 1039 Symbol* s2 = cp2->symbol_at(index2); 1040 if (s1 == s2) { 1041 return true; 1042 } 1043 } break; 1044 1045 // Invalid is used as the tag for the second constant pool entry 1046 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1047 // not be seen by itself. 1048 case JVM_CONSTANT_Invalid: // fall through 1049 1050 default: 1051 ShouldNotReachHere(); 1052 break; 1053 } 1054 1055 return false; 1056 } // end compare_entry_to() 1057 1058 1059 // Resize the operands array with delta_len and delta_size. 1060 // Used in RedefineClasses for CP merge. 1061 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { 1062 int old_len = operand_array_length(operands()); 1063 int new_len = old_len + delta_len; 1064 int min_len = (delta_len > 0) ? old_len : new_len; 1065 1066 int old_size = operands()->length(); 1067 int new_size = old_size + delta_size; 1068 int min_size = (delta_size > 0) ? old_size : new_size; 1069 1070 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1071 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); 1072 1073 // Set index in the resized array for existing elements only 1074 for (int idx = 0; idx < min_len; idx++) { 1075 int offset = operand_offset_at(idx); // offset in original array 1076 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array 1077 } 1078 // Copy the bootstrap specifiers only 1079 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), 1080 new_ops->adr_at(2*new_len), 1081 (min_size - 2*min_len) * sizeof(u2)); 1082 // Explicitly deallocate old operands array. 1083 // Note, it is not needed for 7u backport. 1084 if ( operands() != NULL) { // the safety check 1085 MetadataFactory::free_array<u2>(loader_data, operands()); 1086 } 1087 set_operands(new_ops); 1088 } // end resize_operands() 1089 1090 1091 // Extend the operands array with the length and size of the ext_cp operands. 1092 // Used in RedefineClasses for CP merge. 1093 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) { 1094 int delta_len = operand_array_length(ext_cp->operands()); 1095 if (delta_len == 0) { 1096 return; // nothing to do 1097 } 1098 int delta_size = ext_cp->operands()->length(); 1099 1100 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); 1101 1102 if (operand_array_length(operands()) == 0) { 1103 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1104 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); 1105 // The first element index defines the offset of second part 1106 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array 1107 set_operands(new_ops); 1108 } else { 1109 resize_operands(delta_len, delta_size, CHECK); 1110 } 1111 1112 } // end extend_operands() 1113 1114 1115 // Shrink the operands array to a smaller array with new_len length. 1116 // Used in RedefineClasses for CP merge. 1117 void ConstantPool::shrink_operands(int new_len, TRAPS) { 1118 int old_len = operand_array_length(operands()); 1119 if (new_len == old_len) { 1120 return; // nothing to do 1121 } 1122 assert(new_len < old_len, "shrunken operands array must be smaller"); 1123 1124 int free_base = operand_next_offset_at(new_len - 1); 1125 int delta_len = new_len - old_len; 1126 int delta_size = 2*delta_len + free_base - operands()->length(); 1127 1128 resize_operands(delta_len, delta_size, CHECK); 1129 1130 } // end shrink_operands() 1131 1132 1133 void ConstantPool::copy_operands(const constantPoolHandle& from_cp, 1134 const constantPoolHandle& to_cp, 1135 TRAPS) { 1136 1137 int from_oplen = operand_array_length(from_cp->operands()); 1138 int old_oplen = operand_array_length(to_cp->operands()); 1139 if (from_oplen != 0) { 1140 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); 1141 // append my operands to the target's operands array 1142 if (old_oplen == 0) { 1143 // Can't just reuse from_cp's operand list because of deallocation issues 1144 int len = from_cp->operands()->length(); 1145 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); 1146 Copy::conjoint_memory_atomic( 1147 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); 1148 to_cp->set_operands(new_ops); 1149 } else { 1150 int old_len = to_cp->operands()->length(); 1151 int from_len = from_cp->operands()->length(); 1152 int old_off = old_oplen * sizeof(u2); 1153 int from_off = from_oplen * sizeof(u2); 1154 // Use the metaspace for the destination constant pool 1155 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); 1156 int fillp = 0, len = 0; 1157 // first part of dest 1158 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), 1159 new_operands->adr_at(fillp), 1160 (len = old_off) * sizeof(u2)); 1161 fillp += len; 1162 // first part of src 1163 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), 1164 new_operands->adr_at(fillp), 1165 (len = from_off) * sizeof(u2)); 1166 fillp += len; 1167 // second part of dest 1168 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), 1169 new_operands->adr_at(fillp), 1170 (len = old_len - old_off) * sizeof(u2)); 1171 fillp += len; 1172 // second part of src 1173 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), 1174 new_operands->adr_at(fillp), 1175 (len = from_len - from_off) * sizeof(u2)); 1176 fillp += len; 1177 assert(fillp == new_operands->length(), ""); 1178 1179 // Adjust indexes in the first part of the copied operands array. 1180 for (int j = 0; j < from_oplen; j++) { 1181 int offset = operand_offset_at(new_operands, old_oplen + j); 1182 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); 1183 offset += old_len; // every new tuple is preceded by old_len extra u2's 1184 operand_offset_at_put(new_operands, old_oplen + j, offset); 1185 } 1186 1187 // replace target operands array with combined array 1188 to_cp->set_operands(new_operands); 1189 } 1190 } 1191 } // end copy_operands() 1192 1193 1194 // Copy this constant pool's entries at start_i to end_i (inclusive) 1195 // to the constant pool to_cp's entries starting at to_i. A total of 1196 // (end_i - start_i) + 1 entries are copied. 1197 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i, 1198 const constantPoolHandle& to_cp, int to_i, TRAPS) { 1199 1200 1201 int dest_i = to_i; // leave original alone for debug purposes 1202 1203 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { 1204 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); 1205 1206 switch (from_cp->tag_at(src_i).value()) { 1207 case JVM_CONSTANT_Double: 1208 case JVM_CONSTANT_Long: 1209 // double and long take two constant pool entries 1210 src_i += 2; 1211 dest_i += 2; 1212 break; 1213 1214 default: 1215 // all others take one constant pool entry 1216 src_i++; 1217 dest_i++; 1218 break; 1219 } 1220 } 1221 copy_operands(from_cp, to_cp, CHECK); 1222 1223 } // end copy_cp_to_impl() 1224 1225 1226 // Copy this constant pool's entry at from_i to the constant pool 1227 // to_cp's entry at to_i. 1228 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i, 1229 const constantPoolHandle& to_cp, int to_i, 1230 TRAPS) { 1231 1232 int tag = from_cp->tag_at(from_i).value(); 1233 switch (tag) { 1234 case JVM_CONSTANT_Class: 1235 { 1236 Klass* k = from_cp->klass_at(from_i, CHECK); 1237 to_cp->klass_at_put(to_i, k); 1238 } break; 1239 1240 case JVM_CONSTANT_ClassIndex: 1241 { 1242 jint ki = from_cp->klass_index_at(from_i); 1243 to_cp->klass_index_at_put(to_i, ki); 1244 } break; 1245 1246 case JVM_CONSTANT_Double: 1247 { 1248 jdouble d = from_cp->double_at(from_i); 1249 to_cp->double_at_put(to_i, d); 1250 // double takes two constant pool entries so init second entry's tag 1251 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1252 } break; 1253 1254 case JVM_CONSTANT_Fieldref: 1255 { 1256 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1257 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1258 to_cp->field_at_put(to_i, class_index, name_and_type_index); 1259 } break; 1260 1261 case JVM_CONSTANT_Float: 1262 { 1263 jfloat f = from_cp->float_at(from_i); 1264 to_cp->float_at_put(to_i, f); 1265 } break; 1266 1267 case JVM_CONSTANT_Integer: 1268 { 1269 jint i = from_cp->int_at(from_i); 1270 to_cp->int_at_put(to_i, i); 1271 } break; 1272 1273 case JVM_CONSTANT_InterfaceMethodref: 1274 { 1275 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1276 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1277 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); 1278 } break; 1279 1280 case JVM_CONSTANT_Long: 1281 { 1282 jlong l = from_cp->long_at(from_i); 1283 to_cp->long_at_put(to_i, l); 1284 // long takes two constant pool entries so init second entry's tag 1285 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1286 } break; 1287 1288 case JVM_CONSTANT_Methodref: 1289 { 1290 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1291 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1292 to_cp->method_at_put(to_i, class_index, name_and_type_index); 1293 } break; 1294 1295 case JVM_CONSTANT_NameAndType: 1296 { 1297 int name_ref_index = from_cp->name_ref_index_at(from_i); 1298 int signature_ref_index = from_cp->signature_ref_index_at(from_i); 1299 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); 1300 } break; 1301 1302 case JVM_CONSTANT_StringIndex: 1303 { 1304 jint si = from_cp->string_index_at(from_i); 1305 to_cp->string_index_at_put(to_i, si); 1306 } break; 1307 1308 case JVM_CONSTANT_UnresolvedClass: 1309 case JVM_CONSTANT_UnresolvedClassInError: 1310 { 1311 // Can be resolved after checking tag, so check the slot first. 1312 CPSlot entry = from_cp->slot_at(from_i); 1313 if (entry.is_resolved()) { 1314 assert(entry.get_klass()->is_klass(), "must be"); 1315 // Already resolved 1316 to_cp->klass_at_put(to_i, entry.get_klass()); 1317 } else { 1318 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); 1319 } 1320 } break; 1321 1322 case JVM_CONSTANT_String: 1323 { 1324 Symbol* s = from_cp->unresolved_string_at(from_i); 1325 to_cp->unresolved_string_at_put(to_i, s); 1326 } break; 1327 1328 case JVM_CONSTANT_Utf8: 1329 { 1330 Symbol* s = from_cp->symbol_at(from_i); 1331 // Need to increase refcount, the old one will be thrown away and deferenced 1332 s->increment_refcount(); 1333 to_cp->symbol_at_put(to_i, s); 1334 } break; 1335 1336 case JVM_CONSTANT_MethodType: 1337 case JVM_CONSTANT_MethodTypeInError: 1338 { 1339 jint k = from_cp->method_type_index_at(from_i); 1340 to_cp->method_type_index_at_put(to_i, k); 1341 } break; 1342 1343 case JVM_CONSTANT_MethodHandle: 1344 case JVM_CONSTANT_MethodHandleInError: 1345 { 1346 int k1 = from_cp->method_handle_ref_kind_at(from_i); 1347 int k2 = from_cp->method_handle_index_at(from_i); 1348 to_cp->method_handle_index_at_put(to_i, k1, k2); 1349 } break; 1350 1351 case JVM_CONSTANT_InvokeDynamic: 1352 { 1353 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); 1354 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); 1355 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1356 to_cp->invoke_dynamic_at_put(to_i, k1, k2); 1357 } break; 1358 1359 // Invalid is used as the tag for the second constant pool entry 1360 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1361 // not be seen by itself. 1362 case JVM_CONSTANT_Invalid: // fall through 1363 1364 default: 1365 { 1366 ShouldNotReachHere(); 1367 } break; 1368 } 1369 } // end copy_entry_to() 1370 1371 1372 // Search constant pool search_cp for an entry that matches this 1373 // constant pool's entry at pattern_i. Returns the index of a 1374 // matching entry or zero (0) if there is no matching entry. 1375 int ConstantPool::find_matching_entry(int pattern_i, 1376 const constantPoolHandle& search_cp, TRAPS) { 1377 1378 // index zero (0) is not used 1379 for (int i = 1; i < search_cp->length(); i++) { 1380 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); 1381 if (found) { 1382 return i; 1383 } 1384 } 1385 1386 return 0; // entry not found; return unused index zero (0) 1387 } // end find_matching_entry() 1388 1389 1390 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool 1391 // cp2's bootstrap specifier at idx2. 1392 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) { 1393 int k1 = operand_bootstrap_method_ref_index_at(idx1); 1394 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); 1395 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1396 1397 if (!match) { 1398 return false; 1399 } 1400 int argc = operand_argument_count_at(idx1); 1401 if (argc == cp2->operand_argument_count_at(idx2)) { 1402 for (int j = 0; j < argc; j++) { 1403 k1 = operand_argument_index_at(idx1, j); 1404 k2 = cp2->operand_argument_index_at(idx2, j); 1405 match = compare_entry_to(k1, cp2, k2, CHECK_false); 1406 if (!match) { 1407 return false; 1408 } 1409 } 1410 return true; // got through loop; all elements equal 1411 } 1412 return false; 1413 } // end compare_operand_to() 1414 1415 // Search constant pool search_cp for a bootstrap specifier that matches 1416 // this constant pool's bootstrap specifier at pattern_i index. 1417 // Return the index of a matching bootstrap specifier or (-1) if there is no match. 1418 int ConstantPool::find_matching_operand(int pattern_i, 1419 const constantPoolHandle& search_cp, int search_len, TRAPS) { 1420 for (int i = 0; i < search_len; i++) { 1421 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); 1422 if (found) { 1423 return i; 1424 } 1425 } 1426 return -1; // bootstrap specifier not found; return unused index (-1) 1427 } // end find_matching_operand() 1428 1429 1430 #ifndef PRODUCT 1431 1432 const char* ConstantPool::printable_name_at(int which) { 1433 1434 constantTag tag = tag_at(which); 1435 1436 if (tag.is_string()) { 1437 return string_at_noresolve(which); 1438 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 1439 return klass_name_at(which)->as_C_string(); 1440 } else if (tag.is_symbol()) { 1441 return symbol_at(which)->as_C_string(); 1442 } 1443 return ""; 1444 } 1445 1446 #endif // PRODUCT 1447 1448 1449 // JVMTI GetConstantPool support 1450 1451 // For debugging of constant pool 1452 const bool debug_cpool = false; 1453 1454 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) 1455 1456 static void print_cpool_bytes(jint cnt, u1 *bytes) { 1457 const char* WARN_MSG = "Must not be such entry!"; 1458 jint size = 0; 1459 u2 idx1, idx2; 1460 1461 for (jint idx = 1; idx < cnt; idx++) { 1462 jint ent_size = 0; 1463 u1 tag = *bytes++; 1464 size++; // count tag 1465 1466 printf("const #%03d, tag: %02d ", idx, tag); 1467 switch(tag) { 1468 case JVM_CONSTANT_Invalid: { 1469 printf("Invalid"); 1470 break; 1471 } 1472 case JVM_CONSTANT_Unicode: { 1473 printf("Unicode %s", WARN_MSG); 1474 break; 1475 } 1476 case JVM_CONSTANT_Utf8: { 1477 u2 len = Bytes::get_Java_u2(bytes); 1478 char str[128]; 1479 if (len > 127) { 1480 len = 127; 1481 } 1482 strncpy(str, (char *) (bytes+2), len); 1483 str[len] = '\0'; 1484 printf("Utf8 \"%s\"", str); 1485 ent_size = 2 + len; 1486 break; 1487 } 1488 case JVM_CONSTANT_Integer: { 1489 u4 val = Bytes::get_Java_u4(bytes); 1490 printf("int %d", *(int *) &val); 1491 ent_size = 4; 1492 break; 1493 } 1494 case JVM_CONSTANT_Float: { 1495 u4 val = Bytes::get_Java_u4(bytes); 1496 printf("float %5.3ff", *(float *) &val); 1497 ent_size = 4; 1498 break; 1499 } 1500 case JVM_CONSTANT_Long: { 1501 u8 val = Bytes::get_Java_u8(bytes); 1502 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val); 1503 ent_size = 8; 1504 idx++; // Long takes two cpool slots 1505 break; 1506 } 1507 case JVM_CONSTANT_Double: { 1508 u8 val = Bytes::get_Java_u8(bytes); 1509 printf("double %5.3fd", *(jdouble *)&val); 1510 ent_size = 8; 1511 idx++; // Double takes two cpool slots 1512 break; 1513 } 1514 case JVM_CONSTANT_Class: { 1515 idx1 = Bytes::get_Java_u2(bytes); 1516 printf("class #%03d", idx1); 1517 ent_size = 2; 1518 break; 1519 } 1520 case JVM_CONSTANT_String: { 1521 idx1 = Bytes::get_Java_u2(bytes); 1522 printf("String #%03d", idx1); 1523 ent_size = 2; 1524 break; 1525 } 1526 case JVM_CONSTANT_Fieldref: { 1527 idx1 = Bytes::get_Java_u2(bytes); 1528 idx2 = Bytes::get_Java_u2(bytes+2); 1529 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); 1530 ent_size = 4; 1531 break; 1532 } 1533 case JVM_CONSTANT_Methodref: { 1534 idx1 = Bytes::get_Java_u2(bytes); 1535 idx2 = Bytes::get_Java_u2(bytes+2); 1536 printf("Method #%03d, #%03d", idx1, idx2); 1537 ent_size = 4; 1538 break; 1539 } 1540 case JVM_CONSTANT_InterfaceMethodref: { 1541 idx1 = Bytes::get_Java_u2(bytes); 1542 idx2 = Bytes::get_Java_u2(bytes+2); 1543 printf("InterfMethod #%03d, #%03d", idx1, idx2); 1544 ent_size = 4; 1545 break; 1546 } 1547 case JVM_CONSTANT_NameAndType: { 1548 idx1 = Bytes::get_Java_u2(bytes); 1549 idx2 = Bytes::get_Java_u2(bytes+2); 1550 printf("NameAndType #%03d, #%03d", idx1, idx2); 1551 ent_size = 4; 1552 break; 1553 } 1554 case JVM_CONSTANT_ClassIndex: { 1555 printf("ClassIndex %s", WARN_MSG); 1556 break; 1557 } 1558 case JVM_CONSTANT_UnresolvedClass: { 1559 printf("UnresolvedClass: %s", WARN_MSG); 1560 break; 1561 } 1562 case JVM_CONSTANT_UnresolvedClassInError: { 1563 printf("UnresolvedClassInErr: %s", WARN_MSG); 1564 break; 1565 } 1566 case JVM_CONSTANT_StringIndex: { 1567 printf("StringIndex: %s", WARN_MSG); 1568 break; 1569 } 1570 } 1571 printf(";\n"); 1572 bytes += ent_size; 1573 size += ent_size; 1574 } 1575 printf("Cpool size: %d\n", size); 1576 fflush(0); 1577 return; 1578 } /* end print_cpool_bytes */ 1579 1580 1581 // Returns size of constant pool entry. 1582 jint ConstantPool::cpool_entry_size(jint idx) { 1583 switch(tag_at(idx).value()) { 1584 case JVM_CONSTANT_Invalid: 1585 case JVM_CONSTANT_Unicode: 1586 return 1; 1587 1588 case JVM_CONSTANT_Utf8: 1589 return 3 + symbol_at(idx)->utf8_length(); 1590 1591 case JVM_CONSTANT_Class: 1592 case JVM_CONSTANT_String: 1593 case JVM_CONSTANT_ClassIndex: 1594 case JVM_CONSTANT_UnresolvedClass: 1595 case JVM_CONSTANT_UnresolvedClassInError: 1596 case JVM_CONSTANT_StringIndex: 1597 case JVM_CONSTANT_MethodType: 1598 case JVM_CONSTANT_MethodTypeInError: 1599 return 3; 1600 1601 case JVM_CONSTANT_MethodHandle: 1602 case JVM_CONSTANT_MethodHandleInError: 1603 return 4; //tag, ref_kind, ref_index 1604 1605 case JVM_CONSTANT_Integer: 1606 case JVM_CONSTANT_Float: 1607 case JVM_CONSTANT_Fieldref: 1608 case JVM_CONSTANT_Methodref: 1609 case JVM_CONSTANT_InterfaceMethodref: 1610 case JVM_CONSTANT_NameAndType: 1611 return 5; 1612 1613 case JVM_CONSTANT_InvokeDynamic: 1614 // u1 tag, u2 bsm, u2 nt 1615 return 5; 1616 1617 case JVM_CONSTANT_Long: 1618 case JVM_CONSTANT_Double: 1619 return 9; 1620 } 1621 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); 1622 return 1; 1623 } /* end cpool_entry_size */ 1624 1625 1626 // SymbolHashMap is used to find a constant pool index from a string. 1627 // This function fills in SymbolHashMaps, one for utf8s and one for 1628 // class names, returns size of the cpool raw bytes. 1629 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, 1630 SymbolHashMap *classmap) { 1631 jint size = 0; 1632 1633 for (u2 idx = 1; idx < length(); idx++) { 1634 u2 tag = tag_at(idx).value(); 1635 size += cpool_entry_size(idx); 1636 1637 switch(tag) { 1638 case JVM_CONSTANT_Utf8: { 1639 Symbol* sym = symbol_at(idx); 1640 symmap->add_entry(sym, idx); 1641 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); 1642 break; 1643 } 1644 case JVM_CONSTANT_Class: 1645 case JVM_CONSTANT_UnresolvedClass: 1646 case JVM_CONSTANT_UnresolvedClassInError: { 1647 Symbol* sym = klass_name_at(idx); 1648 classmap->add_entry(sym, idx); 1649 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); 1650 break; 1651 } 1652 case JVM_CONSTANT_Long: 1653 case JVM_CONSTANT_Double: { 1654 idx++; // Both Long and Double take two cpool slots 1655 break; 1656 } 1657 } 1658 } 1659 return size; 1660 } /* end hash_utf8_entries_to */ 1661 1662 1663 // Copy cpool bytes. 1664 // Returns: 1665 // 0, in case of OutOfMemoryError 1666 // -1, in case of internal error 1667 // > 0, count of the raw cpool bytes that have been copied 1668 int ConstantPool::copy_cpool_bytes(int cpool_size, 1669 SymbolHashMap* tbl, 1670 unsigned char *bytes) { 1671 u2 idx1, idx2; 1672 jint size = 0; 1673 jint cnt = length(); 1674 unsigned char *start_bytes = bytes; 1675 1676 for (jint idx = 1; idx < cnt; idx++) { 1677 u1 tag = tag_at(idx).value(); 1678 jint ent_size = cpool_entry_size(idx); 1679 1680 assert(size + ent_size <= cpool_size, "Size mismatch"); 1681 1682 *bytes = tag; 1683 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); 1684 switch(tag) { 1685 case JVM_CONSTANT_Invalid: { 1686 DBG(printf("JVM_CONSTANT_Invalid")); 1687 break; 1688 } 1689 case JVM_CONSTANT_Unicode: { 1690 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); 1691 DBG(printf("JVM_CONSTANT_Unicode")); 1692 break; 1693 } 1694 case JVM_CONSTANT_Utf8: { 1695 Symbol* sym = symbol_at(idx); 1696 char* str = sym->as_utf8(); 1697 // Warning! It's crashing on x86 with len = sym->utf8_length() 1698 int len = (int) strlen(str); 1699 Bytes::put_Java_u2((address) (bytes+1), (u2) len); 1700 for (int i = 0; i < len; i++) { 1701 bytes[3+i] = (u1) str[i]; 1702 } 1703 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); 1704 break; 1705 } 1706 case JVM_CONSTANT_Integer: { 1707 jint val = int_at(idx); 1708 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1709 break; 1710 } 1711 case JVM_CONSTANT_Float: { 1712 jfloat val = float_at(idx); 1713 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1714 break; 1715 } 1716 case JVM_CONSTANT_Long: { 1717 jlong val = long_at(idx); 1718 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1719 idx++; // Long takes two cpool slots 1720 break; 1721 } 1722 case JVM_CONSTANT_Double: { 1723 jdouble val = double_at(idx); 1724 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1725 idx++; // Double takes two cpool slots 1726 break; 1727 } 1728 case JVM_CONSTANT_Class: 1729 case JVM_CONSTANT_UnresolvedClass: 1730 case JVM_CONSTANT_UnresolvedClassInError: { 1731 *bytes = JVM_CONSTANT_Class; 1732 Symbol* sym = klass_name_at(idx); 1733 idx1 = tbl->symbol_to_value(sym); 1734 assert(idx1 != 0, "Have not found a hashtable entry"); 1735 Bytes::put_Java_u2((address) (bytes+1), idx1); 1736 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); 1737 break; 1738 } 1739 case JVM_CONSTANT_String: { 1740 *bytes = JVM_CONSTANT_String; 1741 Symbol* sym = unresolved_string_at(idx); 1742 idx1 = tbl->symbol_to_value(sym); 1743 assert(idx1 != 0, "Have not found a hashtable entry"); 1744 Bytes::put_Java_u2((address) (bytes+1), idx1); 1745 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); 1746 break; 1747 } 1748 case JVM_CONSTANT_Fieldref: 1749 case JVM_CONSTANT_Methodref: 1750 case JVM_CONSTANT_InterfaceMethodref: { 1751 idx1 = uncached_klass_ref_index_at(idx); 1752 idx2 = uncached_name_and_type_ref_index_at(idx); 1753 Bytes::put_Java_u2((address) (bytes+1), idx1); 1754 Bytes::put_Java_u2((address) (bytes+3), idx2); 1755 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); 1756 break; 1757 } 1758 case JVM_CONSTANT_NameAndType: { 1759 idx1 = name_ref_index_at(idx); 1760 idx2 = signature_ref_index_at(idx); 1761 Bytes::put_Java_u2((address) (bytes+1), idx1); 1762 Bytes::put_Java_u2((address) (bytes+3), idx2); 1763 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); 1764 break; 1765 } 1766 case JVM_CONSTANT_ClassIndex: { 1767 *bytes = JVM_CONSTANT_Class; 1768 idx1 = klass_index_at(idx); 1769 Bytes::put_Java_u2((address) (bytes+1), idx1); 1770 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); 1771 break; 1772 } 1773 case JVM_CONSTANT_StringIndex: { 1774 *bytes = JVM_CONSTANT_String; 1775 idx1 = string_index_at(idx); 1776 Bytes::put_Java_u2((address) (bytes+1), idx1); 1777 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); 1778 break; 1779 } 1780 case JVM_CONSTANT_MethodHandle: 1781 case JVM_CONSTANT_MethodHandleInError: { 1782 *bytes = JVM_CONSTANT_MethodHandle; 1783 int kind = method_handle_ref_kind_at(idx); 1784 idx1 = method_handle_index_at(idx); 1785 *(bytes+1) = (unsigned char) kind; 1786 Bytes::put_Java_u2((address) (bytes+2), idx1); 1787 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); 1788 break; 1789 } 1790 case JVM_CONSTANT_MethodType: 1791 case JVM_CONSTANT_MethodTypeInError: { 1792 *bytes = JVM_CONSTANT_MethodType; 1793 idx1 = method_type_index_at(idx); 1794 Bytes::put_Java_u2((address) (bytes+1), idx1); 1795 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); 1796 break; 1797 } 1798 case JVM_CONSTANT_InvokeDynamic: { 1799 *bytes = tag; 1800 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 1801 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 1802 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); 1803 Bytes::put_Java_u2((address) (bytes+1), idx1); 1804 Bytes::put_Java_u2((address) (bytes+3), idx2); 1805 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); 1806 break; 1807 } 1808 } 1809 DBG(printf("\n")); 1810 bytes += ent_size; 1811 size += ent_size; 1812 } 1813 assert(size == cpool_size, "Size mismatch"); 1814 1815 // Keep temorarily for debugging until it's stable. 1816 DBG(print_cpool_bytes(cnt, start_bytes)); 1817 return (int)(bytes - start_bytes); 1818 } /* end copy_cpool_bytes */ 1819 1820 #undef DBG 1821 1822 1823 void ConstantPool::set_on_stack(const bool value) { 1824 if (value) { 1825 // Only record if it's not already set. 1826 if (!on_stack()) { 1827 _flags |= _on_stack; 1828 MetadataOnStackMark::record(this); 1829 } 1830 } else { 1831 // Clearing is done single-threadedly. 1832 _flags &= ~_on_stack; 1833 } 1834 } 1835 1836 // JSR 292 support for patching constant pool oops after the class is linked and 1837 // the oop array for resolved references are created. 1838 // We can't do this during classfile parsing, which is how the other indexes are 1839 // patched. The other patches are applied early for some error checking 1840 // so only defer the pseudo_strings. 1841 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) { 1842 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused 1843 Handle patch = cp_patches->at(index); 1844 if (patch.not_null()) { 1845 assert (tag_at(index).is_string(), "should only be string left"); 1846 // Patching a string means pre-resolving it. 1847 // The spelling in the constant pool is ignored. 1848 // The constant reference may be any object whatever. 1849 // If it is not a real interned string, the constant is referred 1850 // to as a "pseudo-string", and must be presented to the CP 1851 // explicitly, because it may require scavenging. 1852 int obj_index = cp_to_object_index(index); 1853 pseudo_string_at_put(index, obj_index, patch()); 1854 DEBUG_ONLY(cp_patches->at_put(index, Handle());) 1855 } 1856 } 1857 #ifdef ASSERT 1858 // Ensure that all the patches have been used. 1859 for (int index = 0; index < cp_patches->length(); index++) { 1860 assert(cp_patches->at(index).is_null(), 1861 "Unused constant pool patch at %d in class file %s", 1862 index, 1863 pool_holder()->external_name()); 1864 } 1865 #endif // ASSERT 1866 } 1867 1868 #ifndef PRODUCT 1869 1870 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool 1871 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { 1872 guarantee(obj->is_constantPool(), "object must be constant pool"); 1873 constantPoolHandle cp(THREAD, (ConstantPool*)obj); 1874 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); 1875 1876 for (int i = 0; i< cp->length(); i++) { 1877 if (cp->tag_at(i).is_unresolved_klass()) { 1878 // This will force loading of the class 1879 Klass* klass = cp->klass_at(i, CHECK); 1880 if (klass->is_instance_klass()) { 1881 // Force initialization of class 1882 InstanceKlass::cast(klass)->initialize(CHECK); 1883 } 1884 } 1885 } 1886 } 1887 1888 #endif 1889 1890 1891 // Printing 1892 1893 void ConstantPool::print_on(outputStream* st) const { 1894 assert(is_constantPool(), "must be constantPool"); 1895 st->print_cr("%s", internal_name()); 1896 if (flags() != 0) { 1897 st->print(" - flags: 0x%x", flags()); 1898 if (has_preresolution()) st->print(" has_preresolution"); 1899 if (on_stack()) st->print(" on_stack"); 1900 st->cr(); 1901 } 1902 if (pool_holder() != NULL) { 1903 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder())); 1904 } 1905 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache())); 1906 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references())); 1907 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map())); 1908 1909 for (int index = 1; index < length(); index++) { // Index 0 is unused 1910 ((ConstantPool*)this)->print_entry_on(index, st); 1911 switch (tag_at(index).value()) { 1912 case JVM_CONSTANT_Long : 1913 case JVM_CONSTANT_Double : 1914 index++; // Skip entry following eigth-byte constant 1915 } 1916 1917 } 1918 st->cr(); 1919 } 1920 1921 // Print one constant pool entry 1922 void ConstantPool::print_entry_on(const int index, outputStream* st) { 1923 EXCEPTION_MARK; 1924 st->print(" - %3d : ", index); 1925 tag_at(index).print_on(st); 1926 st->print(" : "); 1927 switch (tag_at(index).value()) { 1928 case JVM_CONSTANT_Class : 1929 { Klass* k = klass_at(index, CATCH); 1930 guarantee(k != NULL, "need klass"); 1931 k->print_value_on(st); 1932 st->print(" {" PTR_FORMAT "}", p2i(k)); 1933 } 1934 break; 1935 case JVM_CONSTANT_Fieldref : 1936 case JVM_CONSTANT_Methodref : 1937 case JVM_CONSTANT_InterfaceMethodref : 1938 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); 1939 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); 1940 break; 1941 case JVM_CONSTANT_String : 1942 if (is_pseudo_string_at(index)) { 1943 oop anObj = pseudo_string_at(index); 1944 anObj->print_value_on(st); 1945 st->print(" {" PTR_FORMAT "}", p2i(anObj)); 1946 } else { 1947 unresolved_string_at(index)->print_value_on(st); 1948 } 1949 break; 1950 case JVM_CONSTANT_Integer : 1951 st->print("%d", int_at(index)); 1952 break; 1953 case JVM_CONSTANT_Float : 1954 st->print("%f", float_at(index)); 1955 break; 1956 case JVM_CONSTANT_Long : 1957 st->print_jlong(long_at(index)); 1958 break; 1959 case JVM_CONSTANT_Double : 1960 st->print("%lf", double_at(index)); 1961 break; 1962 case JVM_CONSTANT_NameAndType : 1963 st->print("name_index=%d", name_ref_index_at(index)); 1964 st->print(" signature_index=%d", signature_ref_index_at(index)); 1965 break; 1966 case JVM_CONSTANT_Utf8 : 1967 symbol_at(index)->print_value_on(st); 1968 break; 1969 case JVM_CONSTANT_UnresolvedClass : // fall-through 1970 case JVM_CONSTANT_UnresolvedClassInError: { 1971 CPSlot entry = slot_at(index); 1972 if (entry.is_resolved()) { 1973 entry.get_klass()->print_value_on(st); 1974 } else { 1975 entry.get_symbol()->print_value_on(st); 1976 } 1977 } 1978 break; 1979 case JVM_CONSTANT_MethodHandle : 1980 case JVM_CONSTANT_MethodHandleInError : 1981 st->print("ref_kind=%d", method_handle_ref_kind_at(index)); 1982 st->print(" ref_index=%d", method_handle_index_at(index)); 1983 break; 1984 case JVM_CONSTANT_MethodType : 1985 case JVM_CONSTANT_MethodTypeInError : 1986 st->print("signature_index=%d", method_type_index_at(index)); 1987 break; 1988 case JVM_CONSTANT_InvokeDynamic : 1989 { 1990 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); 1991 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); 1992 int argc = invoke_dynamic_argument_count_at(index); 1993 if (argc > 0) { 1994 for (int arg_i = 0; arg_i < argc; arg_i++) { 1995 int arg = invoke_dynamic_argument_index_at(index, arg_i); 1996 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 1997 } 1998 st->print("}"); 1999 } 2000 } 2001 break; 2002 default: 2003 ShouldNotReachHere(); 2004 break; 2005 } 2006 st->cr(); 2007 } 2008 2009 void ConstantPool::print_value_on(outputStream* st) const { 2010 assert(is_constantPool(), "must be constantPool"); 2011 st->print("constant pool [%d]", length()); 2012 if (has_preresolution()) st->print("/preresolution"); 2013 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); 2014 print_address_on(st); 2015 st->print(" for "); 2016 pool_holder()->print_value_on(st); 2017 if (pool_holder() != NULL) { 2018 bool extra = (pool_holder()->constants() != this); 2019 if (extra) st->print(" (extra)"); 2020 } 2021 if (cache() != NULL) { 2022 st->print(" cache=" PTR_FORMAT, p2i(cache())); 2023 } 2024 } 2025 2026 #if INCLUDE_SERVICES 2027 // Size Statistics 2028 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { 2029 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); 2030 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); 2031 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); 2032 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); 2033 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); 2034 2035 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + 2036 sz->_cp_refmap_bytes; 2037 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; 2038 } 2039 #endif // INCLUDE_SERVICES 2040 2041 // Verification 2042 2043 void ConstantPool::verify_on(outputStream* st) { 2044 guarantee(is_constantPool(), "object must be constant pool"); 2045 for (int i = 0; i< length(); i++) { 2046 constantTag tag = tag_at(i); 2047 CPSlot entry = slot_at(i); 2048 if (tag.is_klass()) { 2049 if (entry.is_resolved()) { 2050 guarantee(entry.get_klass()->is_klass(), "should be klass"); 2051 } 2052 } else if (tag.is_unresolved_klass()) { 2053 if (entry.is_resolved()) { 2054 guarantee(entry.get_klass()->is_klass(), "should be klass"); 2055 } 2056 } else if (tag.is_symbol()) { 2057 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2058 } else if (tag.is_string()) { 2059 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2060 } 2061 } 2062 if (cache() != NULL) { 2063 // Note: cache() can be NULL before a class is completely setup or 2064 // in temporary constant pools used during constant pool merging 2065 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); 2066 } 2067 if (pool_holder() != NULL) { 2068 // Note: pool_holder() can be NULL in temporary constant pools 2069 // used during constant pool merging 2070 guarantee(pool_holder()->is_klass(), "should be klass"); 2071 } 2072 } 2073 2074 2075 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { 2076 char *str = sym->as_utf8(); 2077 unsigned int hash = compute_hash(str, sym->utf8_length()); 2078 unsigned int index = hash % table_size(); 2079 2080 // check if already in map 2081 // we prefer the first entry since it is more likely to be what was used in 2082 // the class file 2083 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2084 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2085 if (en->hash() == hash && en->symbol() == sym) { 2086 return; // already there 2087 } 2088 } 2089 2090 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); 2091 entry->set_next(bucket(index)); 2092 _buckets[index].set_entry(entry); 2093 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2094 } 2095 2096 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { 2097 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); 2098 char *str = sym->as_utf8(); 2099 int len = sym->utf8_length(); 2100 unsigned int hash = SymbolHashMap::compute_hash(str, len); 2101 unsigned int index = hash % table_size(); 2102 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2103 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2104 if (en->hash() == hash && en->symbol() == sym) { 2105 return en; 2106 } 2107 } 2108 return NULL; 2109 }