1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoaderData.hpp" 27 #include "classfile/javaClasses.inline.hpp" 28 #include "classfile/metadataOnStackMark.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "interpreter/linkResolver.hpp" 33 #include "memory/heapInspection.hpp" 34 #include "memory/metadataFactory.hpp" 35 #include "memory/oopFactory.hpp" 36 #include "oops/constantPool.hpp" 37 #include "oops/instanceKlass.hpp" 38 #include "oops/objArrayKlass.hpp" 39 #include "oops/objArrayOop.inline.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "runtime/fieldType.hpp" 42 #include "runtime/init.hpp" 43 #include "runtime/javaCalls.hpp" 44 #include "runtime/signature.hpp" 45 #include "runtime/vframe.hpp" 46 #include "utilities/copy.hpp" 47 48 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { 49 // Tags are RW but comment below applies to tags also. 50 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); 51 52 int size = ConstantPool::size(length); 53 54 // CDS considerations: 55 // Allocate read-write but may be able to move to read-only at dumping time 56 // if all the klasses are resolved. The only other field that is writable is 57 // the resolved_references array, which is recreated at startup time. 58 // But that could be moved to InstanceKlass (although a pain to access from 59 // assembly code). Maybe it could be moved to the cpCache which is RW. 60 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); 61 } 62 63 #ifdef ASSERT 64 65 // MetaspaceObj allocation invariant is calloc equivalent memory 66 // simple verification of this here (JVM_CONSTANT_Invalid == 0 ) 67 static bool tag_array_is_zero_initialized(Array<u1>* tags) { 68 assert(tags != NULL, "invariant"); 69 const int length = tags->length(); 70 for (int index = 0; index < length; ++index) { 71 if (JVM_CONSTANT_Invalid != tags->at(index)) { 72 return false; 73 } 74 } 75 return true; 76 } 77 78 #endif 79 80 ConstantPool::ConstantPool(Array<u1>* tags) : 81 _tags(tags), 82 _length(tags->length()) { 83 84 assert(_tags != NULL, "invariant"); 85 assert(tags->length() == _length, "invariant"); 86 assert(tag_array_is_zero_initialized(tags), "invariant"); 87 assert(0 == _flags, "invariant"); 88 assert(0 == version(), "invariant"); 89 assert(NULL == _pool_holder, "invariant"); 90 } 91 92 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { 93 MetadataFactory::free_metadata(loader_data, cache()); 94 set_cache(NULL); 95 MetadataFactory::free_array<u2>(loader_data, reference_map()); 96 set_reference_map(NULL); 97 98 MetadataFactory::free_array<jushort>(loader_data, operands()); 99 set_operands(NULL); 100 101 release_C_heap_structures(); 102 103 // free tag array 104 MetadataFactory::free_array<u1>(loader_data, tags()); 105 set_tags(NULL); 106 } 107 108 void ConstantPool::release_C_heap_structures() { 109 // walk constant pool and decrement symbol reference counts 110 unreference_symbols(); 111 } 112 113 objArrayOop ConstantPool::resolved_references() const { 114 return (objArrayOop)JNIHandles::resolve(_resolved_references); 115 } 116 117 // Create resolved_references array and mapping array for original cp indexes 118 // The ldc bytecode was rewritten to have the resolved reference array index so need a way 119 // to map it back for resolving and some unlikely miscellaneous uses. 120 // The objects created by invokedynamic are appended to this list. 121 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, 122 const intStack& reference_map, 123 int constant_pool_map_length, 124 TRAPS) { 125 // Initialized the resolved object cache. 126 int map_length = reference_map.length(); 127 if (map_length > 0) { 128 // Only need mapping back to constant pool entries. The map isn't used for 129 // invokedynamic resolved_reference entries. For invokedynamic entries, 130 // the constant pool cache index has the mapping back to both the constant 131 // pool and to the resolved reference index. 132 if (constant_pool_map_length > 0) { 133 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK); 134 135 for (int i = 0; i < constant_pool_map_length; i++) { 136 int x = reference_map.at(i); 137 assert(x == (int)(jushort) x, "klass index is too big"); 138 om->at_put(i, (jushort)x); 139 } 140 set_reference_map(om); 141 } 142 143 // Create Java array for holding resolved strings, methodHandles, 144 // methodTypes, invokedynamic and invokehandle appendix objects, etc. 145 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 146 Handle refs_handle (THREAD, (oop)stom); // must handleize. 147 set_resolved_references(loader_data->add_handle(refs_handle)); 148 } 149 } 150 151 // CDS support. Create a new resolved_references array. 152 void ConstantPool::restore_unshareable_info(TRAPS) { 153 154 // Only create the new resolved references array if it hasn't been attempted before 155 if (resolved_references() != NULL) return; 156 157 // restore the C++ vtable from the shared archive 158 restore_vtable(); 159 160 if (SystemDictionary::Object_klass_loaded()) { 161 // Recreate the object array and add to ClassLoaderData. 162 int map_length = resolved_reference_length(); 163 if (map_length > 0) { 164 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 165 Handle refs_handle (THREAD, (oop)stom); // must handleize. 166 167 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 168 set_resolved_references(loader_data->add_handle(refs_handle)); 169 } 170 } 171 } 172 173 void ConstantPool::remove_unshareable_info() { 174 // Resolved references are not in the shared archive. 175 // Save the length for restoration. It is not necessarily the same length 176 // as reference_map.length() if invokedynamic is saved. 177 set_resolved_reference_length( 178 resolved_references() != NULL ? resolved_references()->length() : 0); 179 set_resolved_references(NULL); 180 } 181 182 int ConstantPool::cp_to_object_index(int cp_index) { 183 // this is harder don't do this so much. 184 int i = reference_map()->find(cp_index); 185 // We might not find the index for jsr292 call. 186 return (i < 0) ? _no_index_sentinel : i; 187 } 188 189 void ConstantPool::string_at_put(int which, int obj_index, oop str) { 190 resolved_references()->obj_at_put(obj_index, str); 191 } 192 193 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, KlassHandle k) { 194 ResourceMark rm; 195 int line_number = -1; 196 const char * source_file = NULL; 197 if (JavaThread::current()->has_last_Java_frame()) { 198 // try to identify the method which called this function. 199 vframeStream vfst(JavaThread::current()); 200 if (!vfst.at_end()) { 201 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 202 Symbol* s = vfst.method()->method_holder()->source_file_name(); 203 if (s != NULL) { 204 source_file = s->as_C_string(); 205 } 206 } 207 } 208 if (k() != this_cp->pool_holder()) { 209 // only print something if the classes are different 210 if (source_file != NULL) { 211 log_info(classresolve)("%s %s %s:%d", 212 this_cp->pool_holder()->external_name(), 213 k->external_name(), source_file, line_number); 214 } else { 215 log_info(classresolve)("%s %s", 216 this_cp->pool_holder()->external_name(), 217 k->external_name()); 218 } 219 } 220 } 221 222 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which, 223 bool save_resolution_error, TRAPS) { 224 assert(THREAD->is_Java_thread(), "must be a Java thread"); 225 226 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 227 // It is not safe to rely on the tag bit's here, since we don't have a lock, and 228 // the entry and tag is not updated atomicly. 229 CPSlot entry = this_cp->slot_at(which); 230 if (entry.is_resolved()) { 231 assert(entry.get_klass()->is_klass(), "must be"); 232 // Already resolved - return entry. 233 return entry.get_klass(); 234 } 235 236 // This tag doesn't change back to unresolved class unless at a safepoint. 237 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) { 238 // The original attempt to resolve this constant pool entry failed so find the 239 // class of the original error and throw another error of the same class 240 // (JVMS 5.4.3). 241 // If there is a detail message, pass that detail message to the error. 242 // The JVMS does not strictly require us to duplicate the same detail message, 243 // or any internal exception fields such as cause or stacktrace. But since the 244 // detail message is often a class name or other literal string, we will repeat it 245 // if we can find it in the symbol table. 246 throw_resolution_error(this_cp, which, CHECK_0); 247 ShouldNotReachHere(); 248 } 249 250 Handle mirror_handle; 251 Symbol* name = entry.get_symbol(); 252 Handle loader (THREAD, this_cp->pool_holder()->class_loader()); 253 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain()); 254 Klass* kk = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD); 255 KlassHandle k (THREAD, kk); 256 if (!HAS_PENDING_EXCEPTION) { 257 // preserve the resolved klass from unloading 258 mirror_handle = Handle(THREAD, kk->java_mirror()); 259 // Do access check for klasses 260 verify_constant_pool_resolve(this_cp, k, THREAD); 261 } 262 263 // Failed to resolve class. We must record the errors so that subsequent attempts 264 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). 265 if (HAS_PENDING_EXCEPTION) { 266 if (save_resolution_error) { 267 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL); 268 // If CHECK_NULL above doesn't return the exception, that means that 269 // some other thread has beaten us and has resolved the class. 270 // To preserve old behavior, we return the resolved class. 271 entry = this_cp->resolved_klass_at(which); 272 assert(entry.is_resolved(), "must be resolved if exception was cleared"); 273 assert(entry.get_klass()->is_klass(), "must be resolved to a klass"); 274 return entry.get_klass(); 275 } else { 276 return NULL; // return the pending exception 277 } 278 } 279 280 // Make this class loader depend upon the class loader owning the class reference 281 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data(); 282 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM 283 284 if (log_is_enabled(Info, classresolve) && !k->is_array_klass()) { 285 // skip resolving the constant pool so that this code gets 286 // called the next time some bytecodes refer to this class. 287 trace_class_resolution(this_cp, k); 288 return k(); 289 } else { 290 this_cp->klass_at_put(which, k()); 291 } 292 293 entry = this_cp->resolved_klass_at(which); 294 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); 295 return entry.get_klass(); 296 } 297 298 299 // Does not update ConstantPool* - to avoid any exception throwing. Used 300 // by compiler and exception handling. Also used to avoid classloads for 301 // instanceof operations. Returns NULL if the class has not been loaded or 302 // if the verification of constant pool failed 303 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) { 304 CPSlot entry = this_cp->slot_at(which); 305 if (entry.is_resolved()) { 306 assert(entry.get_klass()->is_klass(), "must be"); 307 return entry.get_klass(); 308 } else { 309 assert(entry.is_unresolved(), "must be either symbol or klass"); 310 Thread *thread = Thread::current(); 311 Symbol* name = entry.get_symbol(); 312 oop loader = this_cp->pool_holder()->class_loader(); 313 oop protection_domain = this_cp->pool_holder()->protection_domain(); 314 Handle h_prot (thread, protection_domain); 315 Handle h_loader (thread, loader); 316 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); 317 318 if (k != NULL) { 319 // Make sure that resolving is legal 320 EXCEPTION_MARK; 321 KlassHandle klass(THREAD, k); 322 // return NULL if verification fails 323 verify_constant_pool_resolve(this_cp, klass, THREAD); 324 if (HAS_PENDING_EXCEPTION) { 325 CLEAR_PENDING_EXCEPTION; 326 return NULL; 327 } 328 return klass(); 329 } else { 330 return k; 331 } 332 } 333 } 334 335 336 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) { 337 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which)); 338 } 339 340 341 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool, 342 int which) { 343 if (cpool->cache() == NULL) return NULL; // nothing to load yet 344 int cache_index = decode_cpcache_index(which, true); 345 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { 346 // FIXME: should be an assert 347 if (PrintMiscellaneous && (Verbose||WizardMode)) { 348 tty->print_cr("bad operand %d in:", which); cpool->print(); 349 } 350 return NULL; 351 } 352 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 353 return e->method_if_resolved(cpool); 354 } 355 356 357 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 358 if (cpool->cache() == NULL) return false; // nothing to load yet 359 int cache_index = decode_cpcache_index(which, true); 360 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 361 return e->has_appendix(); 362 } 363 364 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 365 if (cpool->cache() == NULL) return NULL; // nothing to load yet 366 int cache_index = decode_cpcache_index(which, true); 367 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 368 return e->appendix_if_resolved(cpool); 369 } 370 371 372 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) { 373 if (cpool->cache() == NULL) return false; // nothing to load yet 374 int cache_index = decode_cpcache_index(which, true); 375 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 376 return e->has_method_type(); 377 } 378 379 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) { 380 if (cpool->cache() == NULL) return NULL; // nothing to load yet 381 int cache_index = decode_cpcache_index(which, true); 382 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 383 return e->method_type_if_resolved(cpool); 384 } 385 386 387 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { 388 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 389 return symbol_at(name_index); 390 } 391 392 393 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { 394 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 395 return symbol_at(signature_index); 396 } 397 398 399 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { 400 int i = which; 401 if (!uncached && cache() != NULL) { 402 if (ConstantPool::is_invokedynamic_index(which)) { 403 // Invokedynamic index is index into resolved_references 404 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); 405 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); 406 assert(tag_at(pool_index).is_name_and_type(), ""); 407 return pool_index; 408 } 409 // change byte-ordering and go via cache 410 i = remap_instruction_operand_from_cache(which); 411 } else { 412 if (tag_at(which).is_invoke_dynamic()) { 413 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); 414 assert(tag_at(pool_index).is_name_and_type(), ""); 415 return pool_index; 416 } 417 } 418 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 419 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); 420 jint ref_index = *int_at_addr(i); 421 return extract_high_short_from_int(ref_index); 422 } 423 424 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) { 425 int pool_index = which; 426 if (!uncached && cache() != NULL) { 427 if (ConstantPool::is_invokedynamic_index(which)) { 428 // Invokedynamic index is index into resolved_references 429 pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); 430 } else { 431 // change byte-ordering and go via cache 432 pool_index = remap_instruction_operand_from_cache(which); 433 } 434 } 435 return tag_at(pool_index); 436 } 437 438 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { 439 guarantee(!ConstantPool::is_invokedynamic_index(which), 440 "an invokedynamic instruction does not have a klass"); 441 int i = which; 442 if (!uncached && cache() != NULL) { 443 // change byte-ordering and go via cache 444 i = remap_instruction_operand_from_cache(which); 445 } 446 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 447 jint ref_index = *int_at_addr(i); 448 return extract_low_short_from_int(ref_index); 449 } 450 451 452 453 int ConstantPool::remap_instruction_operand_from_cache(int operand) { 454 int cpc_index = operand; 455 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); 456 assert((int)(u2)cpc_index == cpc_index, "clean u2"); 457 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); 458 return member_index; 459 } 460 461 462 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, KlassHandle k, TRAPS) { 463 if (k->is_instance_klass() || k->is_objArray_klass()) { 464 instanceKlassHandle holder (THREAD, this_cp->pool_holder()); 465 Klass* elem = k->is_instance_klass() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); 466 KlassHandle element (THREAD, elem); 467 468 // The element type could be a typeArray - we only need the access check if it is 469 // an reference to another class 470 if (element->is_instance_klass()) { 471 LinkResolver::check_klass_accessability(holder, element, CHECK); 472 } 473 } 474 } 475 476 477 int ConstantPool::name_ref_index_at(int which_nt) { 478 jint ref_index = name_and_type_at(which_nt); 479 return extract_low_short_from_int(ref_index); 480 } 481 482 483 int ConstantPool::signature_ref_index_at(int which_nt) { 484 jint ref_index = name_and_type_at(which_nt); 485 return extract_high_short_from_int(ref_index); 486 } 487 488 489 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { 490 return klass_at(klass_ref_index_at(which), THREAD); 491 } 492 493 494 Symbol* ConstantPool::klass_name_at(int which) const { 495 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), 496 "Corrupted constant pool"); 497 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 498 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and 499 // tag is not updated atomicly. 500 CPSlot entry = slot_at(which); 501 if (entry.is_resolved()) { 502 // Already resolved - return entry's name. 503 assert(entry.get_klass()->is_klass(), "must be"); 504 return entry.get_klass()->name(); 505 } else { 506 assert(entry.is_unresolved(), "must be either symbol or klass"); 507 return entry.get_symbol(); 508 } 509 } 510 511 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { 512 jint ref_index = klass_ref_index_at(which); 513 return klass_at_noresolve(ref_index); 514 } 515 516 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { 517 jint ref_index = uncached_klass_ref_index_at(which); 518 return klass_at_noresolve(ref_index); 519 } 520 521 char* ConstantPool::string_at_noresolve(int which) { 522 return unresolved_string_at(which)->as_C_string(); 523 } 524 525 BasicType ConstantPool::basic_type_for_signature_at(int which) const { 526 return FieldType::basic_type(symbol_at(which)); 527 } 528 529 530 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) { 531 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused 532 if (this_cp->tag_at(index).is_string()) { 533 this_cp->string_at(index, CHECK); 534 } 535 } 536 } 537 538 // Resolve all the classes in the constant pool. If they are all resolved, 539 // the constant pool is read-only. Enhancement: allocate cp entries to 540 // another metaspace, and copy to read-only or read-write space if this 541 // bit is set. 542 bool ConstantPool::resolve_class_constants(TRAPS) { 543 constantPoolHandle cp(THREAD, this); 544 for (int index = 1; index < length(); index++) { // Index 0 is unused 545 if (tag_at(index).is_unresolved_klass() && 546 klass_at_if_loaded(cp, index) == NULL) { 547 return false; 548 } 549 } 550 // set_preresolution(); or some bit for future use 551 return true; 552 } 553 554 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) { 555 // Dig out the detailed message to reuse if possible 556 Symbol* message = java_lang_Throwable::detail_message(pending_exception); 557 if (message != NULL) { 558 return message; 559 } 560 561 // Return specific message for the tag 562 switch (tag.value()) { 563 case JVM_CONSTANT_UnresolvedClass: 564 // return the class name in the error message 565 message = this_cp->klass_name_at(which); 566 break; 567 case JVM_CONSTANT_MethodHandle: 568 // return the method handle name in the error message 569 message = this_cp->method_handle_name_ref_at(which); 570 break; 571 case JVM_CONSTANT_MethodType: 572 // return the method type signature in the error message 573 message = this_cp->method_type_signature_at(which); 574 break; 575 default: 576 ShouldNotReachHere(); 577 } 578 579 return message; 580 } 581 582 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) { 583 Symbol* message = NULL; 584 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message); 585 assert(error != NULL && message != NULL, "checking"); 586 CLEAR_PENDING_EXCEPTION; 587 ResourceMark rm; 588 THROW_MSG(error, message->as_C_string()); 589 } 590 591 // If resolution for Class, MethodHandle or MethodType fails, save the exception 592 // in the resolution error table, so that the same exception is thrown again. 593 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which, 594 constantTag tag, TRAPS) { 595 Symbol* error = PENDING_EXCEPTION->klass()->name(); 596 597 int error_tag = tag.error_value(); 598 599 if (!PENDING_EXCEPTION-> 600 is_a(SystemDictionary::LinkageError_klass())) { 601 // Just throw the exception and don't prevent these classes from 602 // being loaded due to virtual machine errors like StackOverflow 603 // and OutOfMemoryError, etc, or if the thread was hit by stop() 604 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 605 } else if (this_cp->tag_at(which).value() != error_tag) { 606 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION); 607 SystemDictionary::add_resolution_error(this_cp, which, error, message); 608 // CAS in the tag. If a thread beat us to registering this error that's fine. 609 // If another thread resolved the reference, this is a race condition. This 610 // thread may have had a security manager or something temporary. 611 // This doesn't deterministically get an error. So why do we save this? 612 // We save this because jvmti can add classes to the bootclass path after 613 // this error, so it needs to get the same error if the error is first. 614 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag, 615 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value()); 616 if (old_tag != error_tag && old_tag != tag.value()) { 617 // MethodHandles and MethodType doesn't change to resolved version. 618 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value"); 619 // Forget the exception and use the resolved class. 620 CLEAR_PENDING_EXCEPTION; 621 } 622 } else { 623 // some other thread put this in error state 624 throw_resolution_error(this_cp, which, CHECK); 625 } 626 } 627 628 // Called to resolve constants in the constant pool and return an oop. 629 // Some constant pool entries cache their resolved oop. This is also 630 // called to create oops from constants to use in arguments for invokedynamic 631 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) { 632 oop result_oop = NULL; 633 Handle throw_exception; 634 635 if (cache_index == _possible_index_sentinel) { 636 // It is possible that this constant is one which is cached in the objects. 637 // We'll do a linear search. This should be OK because this usage is rare. 638 assert(index > 0, "valid index"); 639 cache_index = this_cp->cp_to_object_index(index); 640 } 641 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); 642 assert(index == _no_index_sentinel || index >= 0, ""); 643 644 if (cache_index >= 0) { 645 result_oop = this_cp->resolved_references()->obj_at(cache_index); 646 if (result_oop != NULL) { 647 return result_oop; 648 // That was easy... 649 } 650 index = this_cp->object_to_cp_index(cache_index); 651 } 652 653 jvalue prim_value; // temp used only in a few cases below 654 655 constantTag tag = this_cp->tag_at(index); 656 657 switch (tag.value()) { 658 659 case JVM_CONSTANT_UnresolvedClass: 660 case JVM_CONSTANT_UnresolvedClassInError: 661 case JVM_CONSTANT_Class: 662 { 663 assert(cache_index == _no_index_sentinel, "should not have been set"); 664 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL); 665 // ldc wants the java mirror. 666 result_oop = resolved->java_mirror(); 667 break; 668 } 669 670 case JVM_CONSTANT_String: 671 assert(cache_index != _no_index_sentinel, "should have been set"); 672 if (this_cp->is_pseudo_string_at(index)) { 673 result_oop = this_cp->pseudo_string_at(index, cache_index); 674 break; 675 } 676 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL); 677 break; 678 679 case JVM_CONSTANT_MethodHandleInError: 680 case JVM_CONSTANT_MethodTypeInError: 681 { 682 throw_resolution_error(this_cp, index, CHECK_NULL); 683 break; 684 } 685 686 case JVM_CONSTANT_MethodHandle: 687 { 688 int ref_kind = this_cp->method_handle_ref_kind_at(index); 689 int callee_index = this_cp->method_handle_klass_index_at(index); 690 Symbol* name = this_cp->method_handle_name_ref_at(index); 691 Symbol* signature = this_cp->method_handle_signature_ref_at(index); 692 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index)); 693 if (PrintMiscellaneous) 694 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", 695 ref_kind, index, this_cp->method_handle_index_at(index), 696 callee_index, name->as_C_string(), signature->as_C_string()); 697 KlassHandle callee; 698 { Klass* k = klass_at_impl(this_cp, callee_index, true, CHECK_NULL); 699 callee = KlassHandle(THREAD, k); 700 } 701 // Check tag consistency, relax for interface static default method. 702 if ((callee->is_interface() && !m_tag.is_interface_method()) || 703 (!callee->is_interface() && m_tag.is_interface_method())) { 704 ResourceMark rm(THREAD); 705 char buf[200]; 706 jio_snprintf(buf, sizeof(buf), "Inconsistent constant data for %s.%s%s at index %d", 707 callee->name()->as_C_string(), name->as_C_string(), signature->as_C_string(), index); 708 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 709 } 710 711 KlassHandle klass(THREAD, this_cp->pool_holder()); 712 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, 713 callee, name, signature, 714 THREAD); 715 result_oop = value(); 716 if (HAS_PENDING_EXCEPTION) { 717 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 718 } 719 break; 720 } 721 722 case JVM_CONSTANT_MethodType: 723 { 724 Symbol* signature = this_cp->method_type_signature_at(index); 725 if (PrintMiscellaneous) 726 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", 727 index, this_cp->method_type_index_at(index), 728 signature->as_C_string()); 729 KlassHandle klass(THREAD, this_cp->pool_holder()); 730 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); 731 result_oop = value(); 732 if (HAS_PENDING_EXCEPTION) { 733 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 734 } 735 break; 736 } 737 738 case JVM_CONSTANT_Integer: 739 assert(cache_index == _no_index_sentinel, "should not have been set"); 740 prim_value.i = this_cp->int_at(index); 741 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); 742 break; 743 744 case JVM_CONSTANT_Float: 745 assert(cache_index == _no_index_sentinel, "should not have been set"); 746 prim_value.f = this_cp->float_at(index); 747 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); 748 break; 749 750 case JVM_CONSTANT_Long: 751 assert(cache_index == _no_index_sentinel, "should not have been set"); 752 prim_value.j = this_cp->long_at(index); 753 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); 754 break; 755 756 case JVM_CONSTANT_Double: 757 assert(cache_index == _no_index_sentinel, "should not have been set"); 758 prim_value.d = this_cp->double_at(index); 759 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); 760 break; 761 762 default: 763 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", 764 this_cp(), index, cache_index, tag.value())); 765 assert(false, "unexpected constant tag"); 766 break; 767 } 768 769 if (cache_index >= 0) { 770 // Benign race condition: resolved_references may already be filled in. 771 // The important thing here is that all threads pick up the same result. 772 // It doesn't matter which racing thread wins, as long as only one 773 // result is used by all threads, and all future queries. 774 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL); 775 if (old_result == NULL) { 776 return result_oop; // was installed 777 } else { 778 // Return the winning thread's result. This can be different than 779 // the result here for MethodHandles. 780 return old_result; 781 } 782 } else { 783 return result_oop; 784 } 785 } 786 787 oop ConstantPool::uncached_string_at(int which, TRAPS) { 788 Symbol* sym = unresolved_string_at(which); 789 oop str = StringTable::intern(sym, CHECK_(NULL)); 790 assert(java_lang_String::is_instance(str), "must be string"); 791 return str; 792 } 793 794 795 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) { 796 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); 797 798 Handle bsm; 799 int argc; 800 { 801 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments 802 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. 803 // It is accompanied by the optional arguments. 804 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index); 805 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); 806 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { 807 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); 808 } 809 810 // Extract the optional static arguments. 811 argc = this_cp->invoke_dynamic_argument_count_at(index); 812 if (argc == 0) return bsm_oop; 813 814 bsm = Handle(THREAD, bsm_oop); 815 } 816 817 objArrayHandle info; 818 { 819 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); 820 info = objArrayHandle(THREAD, info_oop); 821 } 822 823 info->obj_at_put(0, bsm()); 824 for (int i = 0; i < argc; i++) { 825 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i); 826 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); 827 info->obj_at_put(1+i, arg_oop); 828 } 829 830 return info(); 831 } 832 833 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) { 834 // If the string has already been interned, this entry will be non-null 835 oop str = this_cp->resolved_references()->obj_at(obj_index); 836 if (str != NULL) return str; 837 Symbol* sym = this_cp->unresolved_string_at(which); 838 str = StringTable::intern(sym, CHECK_(NULL)); 839 this_cp->string_at_put(which, obj_index, str); 840 assert(java_lang_String::is_instance(str), "must be string"); 841 return str; 842 } 843 844 845 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, 846 int which) { 847 // Names are interned, so we can compare Symbol*s directly 848 Symbol* cp_name = klass_name_at(which); 849 return (cp_name == k->name()); 850 } 851 852 853 // Iterate over symbols and decrement ones which are Symbol*s 854 // This is done during GC. 855 // Only decrement the UTF8 symbols. Unresolved classes and strings point to 856 // these symbols but didn't increment the reference count. 857 void ConstantPool::unreference_symbols() { 858 for (int index = 1; index < length(); index++) { // Index 0 is unused 859 constantTag tag = tag_at(index); 860 if (tag.is_symbol()) { 861 symbol_at(index)->decrement_refcount(); 862 } 863 } 864 } 865 866 867 // Compare this constant pool's entry at index1 to the constant pool 868 // cp2's entry at index2. 869 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2, 870 int index2, TRAPS) { 871 872 // The error tags are equivalent to non-error tags when comparing 873 jbyte t1 = tag_at(index1).non_error_value(); 874 jbyte t2 = cp2->tag_at(index2).non_error_value(); 875 876 if (t1 != t2) { 877 // Not the same entry type so there is nothing else to check. Note 878 // that this style of checking will consider resolved/unresolved 879 // class pairs as different. 880 // From the ConstantPool* API point of view, this is correct 881 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this 882 // plays out in the context of ConstantPool* merging. 883 return false; 884 } 885 886 switch (t1) { 887 case JVM_CONSTANT_Class: 888 { 889 Klass* k1 = klass_at(index1, CHECK_false); 890 Klass* k2 = cp2->klass_at(index2, CHECK_false); 891 if (k1 == k2) { 892 return true; 893 } 894 } break; 895 896 case JVM_CONSTANT_ClassIndex: 897 { 898 int recur1 = klass_index_at(index1); 899 int recur2 = cp2->klass_index_at(index2); 900 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 901 if (match) { 902 return true; 903 } 904 } break; 905 906 case JVM_CONSTANT_Double: 907 { 908 jdouble d1 = double_at(index1); 909 jdouble d2 = cp2->double_at(index2); 910 if (d1 == d2) { 911 return true; 912 } 913 } break; 914 915 case JVM_CONSTANT_Fieldref: 916 case JVM_CONSTANT_InterfaceMethodref: 917 case JVM_CONSTANT_Methodref: 918 { 919 int recur1 = uncached_klass_ref_index_at(index1); 920 int recur2 = cp2->uncached_klass_ref_index_at(index2); 921 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 922 if (match) { 923 recur1 = uncached_name_and_type_ref_index_at(index1); 924 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); 925 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 926 if (match) { 927 return true; 928 } 929 } 930 } break; 931 932 case JVM_CONSTANT_Float: 933 { 934 jfloat f1 = float_at(index1); 935 jfloat f2 = cp2->float_at(index2); 936 if (f1 == f2) { 937 return true; 938 } 939 } break; 940 941 case JVM_CONSTANT_Integer: 942 { 943 jint i1 = int_at(index1); 944 jint i2 = cp2->int_at(index2); 945 if (i1 == i2) { 946 return true; 947 } 948 } break; 949 950 case JVM_CONSTANT_Long: 951 { 952 jlong l1 = long_at(index1); 953 jlong l2 = cp2->long_at(index2); 954 if (l1 == l2) { 955 return true; 956 } 957 } break; 958 959 case JVM_CONSTANT_NameAndType: 960 { 961 int recur1 = name_ref_index_at(index1); 962 int recur2 = cp2->name_ref_index_at(index2); 963 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 964 if (match) { 965 recur1 = signature_ref_index_at(index1); 966 recur2 = cp2->signature_ref_index_at(index2); 967 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 968 if (match) { 969 return true; 970 } 971 } 972 } break; 973 974 case JVM_CONSTANT_StringIndex: 975 { 976 int recur1 = string_index_at(index1); 977 int recur2 = cp2->string_index_at(index2); 978 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 979 if (match) { 980 return true; 981 } 982 } break; 983 984 case JVM_CONSTANT_UnresolvedClass: 985 { 986 Symbol* k1 = klass_name_at(index1); 987 Symbol* k2 = cp2->klass_name_at(index2); 988 if (k1 == k2) { 989 return true; 990 } 991 } break; 992 993 case JVM_CONSTANT_MethodType: 994 { 995 int k1 = method_type_index_at_error_ok(index1); 996 int k2 = cp2->method_type_index_at_error_ok(index2); 997 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 998 if (match) { 999 return true; 1000 } 1001 } break; 1002 1003 case JVM_CONSTANT_MethodHandle: 1004 { 1005 int k1 = method_handle_ref_kind_at_error_ok(index1); 1006 int k2 = cp2->method_handle_ref_kind_at_error_ok(index2); 1007 if (k1 == k2) { 1008 int i1 = method_handle_index_at_error_ok(index1); 1009 int i2 = cp2->method_handle_index_at_error_ok(index2); 1010 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); 1011 if (match) { 1012 return true; 1013 } 1014 } 1015 } break; 1016 1017 case JVM_CONSTANT_InvokeDynamic: 1018 { 1019 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); 1020 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); 1021 int i1 = invoke_dynamic_bootstrap_specifier_index(index1); 1022 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); 1023 // separate statements and variables because CHECK_false is used 1024 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); 1025 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); 1026 return (match_entry && match_operand); 1027 } break; 1028 1029 case JVM_CONSTANT_String: 1030 { 1031 Symbol* s1 = unresolved_string_at(index1); 1032 Symbol* s2 = cp2->unresolved_string_at(index2); 1033 if (s1 == s2) { 1034 return true; 1035 } 1036 } break; 1037 1038 case JVM_CONSTANT_Utf8: 1039 { 1040 Symbol* s1 = symbol_at(index1); 1041 Symbol* s2 = cp2->symbol_at(index2); 1042 if (s1 == s2) { 1043 return true; 1044 } 1045 } break; 1046 1047 // Invalid is used as the tag for the second constant pool entry 1048 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1049 // not be seen by itself. 1050 case JVM_CONSTANT_Invalid: // fall through 1051 1052 default: 1053 ShouldNotReachHere(); 1054 break; 1055 } 1056 1057 return false; 1058 } // end compare_entry_to() 1059 1060 1061 // Resize the operands array with delta_len and delta_size. 1062 // Used in RedefineClasses for CP merge. 1063 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { 1064 int old_len = operand_array_length(operands()); 1065 int new_len = old_len + delta_len; 1066 int min_len = (delta_len > 0) ? old_len : new_len; 1067 1068 int old_size = operands()->length(); 1069 int new_size = old_size + delta_size; 1070 int min_size = (delta_size > 0) ? old_size : new_size; 1071 1072 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1073 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); 1074 1075 // Set index in the resized array for existing elements only 1076 for (int idx = 0; idx < min_len; idx++) { 1077 int offset = operand_offset_at(idx); // offset in original array 1078 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array 1079 } 1080 // Copy the bootstrap specifiers only 1081 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), 1082 new_ops->adr_at(2*new_len), 1083 (min_size - 2*min_len) * sizeof(u2)); 1084 // Explicitly deallocate old operands array. 1085 // Note, it is not needed for 7u backport. 1086 if ( operands() != NULL) { // the safety check 1087 MetadataFactory::free_array<u2>(loader_data, operands()); 1088 } 1089 set_operands(new_ops); 1090 } // end resize_operands() 1091 1092 1093 // Extend the operands array with the length and size of the ext_cp operands. 1094 // Used in RedefineClasses for CP merge. 1095 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) { 1096 int delta_len = operand_array_length(ext_cp->operands()); 1097 if (delta_len == 0) { 1098 return; // nothing to do 1099 } 1100 int delta_size = ext_cp->operands()->length(); 1101 1102 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); 1103 1104 if (operand_array_length(operands()) == 0) { 1105 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1106 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); 1107 // The first element index defines the offset of second part 1108 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array 1109 set_operands(new_ops); 1110 } else { 1111 resize_operands(delta_len, delta_size, CHECK); 1112 } 1113 1114 } // end extend_operands() 1115 1116 1117 // Shrink the operands array to a smaller array with new_len length. 1118 // Used in RedefineClasses for CP merge. 1119 void ConstantPool::shrink_operands(int new_len, TRAPS) { 1120 int old_len = operand_array_length(operands()); 1121 if (new_len == old_len) { 1122 return; // nothing to do 1123 } 1124 assert(new_len < old_len, "shrunken operands array must be smaller"); 1125 1126 int free_base = operand_next_offset_at(new_len - 1); 1127 int delta_len = new_len - old_len; 1128 int delta_size = 2*delta_len + free_base - operands()->length(); 1129 1130 resize_operands(delta_len, delta_size, CHECK); 1131 1132 } // end shrink_operands() 1133 1134 1135 void ConstantPool::copy_operands(const constantPoolHandle& from_cp, 1136 const constantPoolHandle& to_cp, 1137 TRAPS) { 1138 1139 int from_oplen = operand_array_length(from_cp->operands()); 1140 int old_oplen = operand_array_length(to_cp->operands()); 1141 if (from_oplen != 0) { 1142 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); 1143 // append my operands to the target's operands array 1144 if (old_oplen == 0) { 1145 // Can't just reuse from_cp's operand list because of deallocation issues 1146 int len = from_cp->operands()->length(); 1147 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); 1148 Copy::conjoint_memory_atomic( 1149 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); 1150 to_cp->set_operands(new_ops); 1151 } else { 1152 int old_len = to_cp->operands()->length(); 1153 int from_len = from_cp->operands()->length(); 1154 int old_off = old_oplen * sizeof(u2); 1155 int from_off = from_oplen * sizeof(u2); 1156 // Use the metaspace for the destination constant pool 1157 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); 1158 int fillp = 0, len = 0; 1159 // first part of dest 1160 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), 1161 new_operands->adr_at(fillp), 1162 (len = old_off) * sizeof(u2)); 1163 fillp += len; 1164 // first part of src 1165 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), 1166 new_operands->adr_at(fillp), 1167 (len = from_off) * sizeof(u2)); 1168 fillp += len; 1169 // second part of dest 1170 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), 1171 new_operands->adr_at(fillp), 1172 (len = old_len - old_off) * sizeof(u2)); 1173 fillp += len; 1174 // second part of src 1175 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), 1176 new_operands->adr_at(fillp), 1177 (len = from_len - from_off) * sizeof(u2)); 1178 fillp += len; 1179 assert(fillp == new_operands->length(), ""); 1180 1181 // Adjust indexes in the first part of the copied operands array. 1182 for (int j = 0; j < from_oplen; j++) { 1183 int offset = operand_offset_at(new_operands, old_oplen + j); 1184 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); 1185 offset += old_len; // every new tuple is preceded by old_len extra u2's 1186 operand_offset_at_put(new_operands, old_oplen + j, offset); 1187 } 1188 1189 // replace target operands array with combined array 1190 to_cp->set_operands(new_operands); 1191 } 1192 } 1193 } // end copy_operands() 1194 1195 1196 // Copy this constant pool's entries at start_i to end_i (inclusive) 1197 // to the constant pool to_cp's entries starting at to_i. A total of 1198 // (end_i - start_i) + 1 entries are copied. 1199 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i, 1200 const constantPoolHandle& to_cp, int to_i, TRAPS) { 1201 1202 1203 int dest_i = to_i; // leave original alone for debug purposes 1204 1205 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { 1206 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); 1207 1208 switch (from_cp->tag_at(src_i).value()) { 1209 case JVM_CONSTANT_Double: 1210 case JVM_CONSTANT_Long: 1211 // double and long take two constant pool entries 1212 src_i += 2; 1213 dest_i += 2; 1214 break; 1215 1216 default: 1217 // all others take one constant pool entry 1218 src_i++; 1219 dest_i++; 1220 break; 1221 } 1222 } 1223 copy_operands(from_cp, to_cp, CHECK); 1224 1225 } // end copy_cp_to_impl() 1226 1227 1228 // Copy this constant pool's entry at from_i to the constant pool 1229 // to_cp's entry at to_i. 1230 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i, 1231 const constantPoolHandle& to_cp, int to_i, 1232 TRAPS) { 1233 1234 int tag = from_cp->tag_at(from_i).value(); 1235 switch (tag) { 1236 case JVM_CONSTANT_Class: 1237 { 1238 Klass* k = from_cp->klass_at(from_i, CHECK); 1239 to_cp->klass_at_put(to_i, k); 1240 } break; 1241 1242 case JVM_CONSTANT_ClassIndex: 1243 { 1244 jint ki = from_cp->klass_index_at(from_i); 1245 to_cp->klass_index_at_put(to_i, ki); 1246 } break; 1247 1248 case JVM_CONSTANT_Double: 1249 { 1250 jdouble d = from_cp->double_at(from_i); 1251 to_cp->double_at_put(to_i, d); 1252 // double takes two constant pool entries so init second entry's tag 1253 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1254 } break; 1255 1256 case JVM_CONSTANT_Fieldref: 1257 { 1258 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1259 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1260 to_cp->field_at_put(to_i, class_index, name_and_type_index); 1261 } break; 1262 1263 case JVM_CONSTANT_Float: 1264 { 1265 jfloat f = from_cp->float_at(from_i); 1266 to_cp->float_at_put(to_i, f); 1267 } break; 1268 1269 case JVM_CONSTANT_Integer: 1270 { 1271 jint i = from_cp->int_at(from_i); 1272 to_cp->int_at_put(to_i, i); 1273 } break; 1274 1275 case JVM_CONSTANT_InterfaceMethodref: 1276 { 1277 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1278 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1279 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); 1280 } break; 1281 1282 case JVM_CONSTANT_Long: 1283 { 1284 jlong l = from_cp->long_at(from_i); 1285 to_cp->long_at_put(to_i, l); 1286 // long takes two constant pool entries so init second entry's tag 1287 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1288 } break; 1289 1290 case JVM_CONSTANT_Methodref: 1291 { 1292 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1293 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1294 to_cp->method_at_put(to_i, class_index, name_and_type_index); 1295 } break; 1296 1297 case JVM_CONSTANT_NameAndType: 1298 { 1299 int name_ref_index = from_cp->name_ref_index_at(from_i); 1300 int signature_ref_index = from_cp->signature_ref_index_at(from_i); 1301 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); 1302 } break; 1303 1304 case JVM_CONSTANT_StringIndex: 1305 { 1306 jint si = from_cp->string_index_at(from_i); 1307 to_cp->string_index_at_put(to_i, si); 1308 } break; 1309 1310 case JVM_CONSTANT_UnresolvedClass: 1311 case JVM_CONSTANT_UnresolvedClassInError: 1312 { 1313 // Can be resolved after checking tag, so check the slot first. 1314 CPSlot entry = from_cp->slot_at(from_i); 1315 if (entry.is_resolved()) { 1316 assert(entry.get_klass()->is_klass(), "must be"); 1317 // Already resolved 1318 to_cp->klass_at_put(to_i, entry.get_klass()); 1319 } else { 1320 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); 1321 } 1322 } break; 1323 1324 case JVM_CONSTANT_String: 1325 { 1326 Symbol* s = from_cp->unresolved_string_at(from_i); 1327 to_cp->unresolved_string_at_put(to_i, s); 1328 } break; 1329 1330 case JVM_CONSTANT_Utf8: 1331 { 1332 Symbol* s = from_cp->symbol_at(from_i); 1333 // Need to increase refcount, the old one will be thrown away and deferenced 1334 s->increment_refcount(); 1335 to_cp->symbol_at_put(to_i, s); 1336 } break; 1337 1338 case JVM_CONSTANT_MethodType: 1339 case JVM_CONSTANT_MethodTypeInError: 1340 { 1341 jint k = from_cp->method_type_index_at_error_ok(from_i); 1342 to_cp->method_type_index_at_put(to_i, k); 1343 } break; 1344 1345 case JVM_CONSTANT_MethodHandle: 1346 case JVM_CONSTANT_MethodHandleInError: 1347 { 1348 int k1 = from_cp->method_handle_ref_kind_at_error_ok(from_i); 1349 int k2 = from_cp->method_handle_index_at_error_ok(from_i); 1350 to_cp->method_handle_index_at_put(to_i, k1, k2); 1351 } break; 1352 1353 case JVM_CONSTANT_InvokeDynamic: 1354 { 1355 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); 1356 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); 1357 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1358 to_cp->invoke_dynamic_at_put(to_i, k1, k2); 1359 } break; 1360 1361 // Invalid is used as the tag for the second constant pool entry 1362 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1363 // not be seen by itself. 1364 case JVM_CONSTANT_Invalid: // fall through 1365 1366 default: 1367 { 1368 ShouldNotReachHere(); 1369 } break; 1370 } 1371 } // end copy_entry_to() 1372 1373 1374 // Search constant pool search_cp for an entry that matches this 1375 // constant pool's entry at pattern_i. Returns the index of a 1376 // matching entry or zero (0) if there is no matching entry. 1377 int ConstantPool::find_matching_entry(int pattern_i, 1378 const constantPoolHandle& search_cp, TRAPS) { 1379 1380 // index zero (0) is not used 1381 for (int i = 1; i < search_cp->length(); i++) { 1382 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); 1383 if (found) { 1384 return i; 1385 } 1386 } 1387 1388 return 0; // entry not found; return unused index zero (0) 1389 } // end find_matching_entry() 1390 1391 1392 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool 1393 // cp2's bootstrap specifier at idx2. 1394 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) { 1395 int k1 = operand_bootstrap_method_ref_index_at(idx1); 1396 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); 1397 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1398 1399 if (!match) { 1400 return false; 1401 } 1402 int argc = operand_argument_count_at(idx1); 1403 if (argc == cp2->operand_argument_count_at(idx2)) { 1404 for (int j = 0; j < argc; j++) { 1405 k1 = operand_argument_index_at(idx1, j); 1406 k2 = cp2->operand_argument_index_at(idx2, j); 1407 match = compare_entry_to(k1, cp2, k2, CHECK_false); 1408 if (!match) { 1409 return false; 1410 } 1411 } 1412 return true; // got through loop; all elements equal 1413 } 1414 return false; 1415 } // end compare_operand_to() 1416 1417 // Search constant pool search_cp for a bootstrap specifier that matches 1418 // this constant pool's bootstrap specifier at pattern_i index. 1419 // Return the index of a matching bootstrap specifier or (-1) if there is no match. 1420 int ConstantPool::find_matching_operand(int pattern_i, 1421 const constantPoolHandle& search_cp, int search_len, TRAPS) { 1422 for (int i = 0; i < search_len; i++) { 1423 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); 1424 if (found) { 1425 return i; 1426 } 1427 } 1428 return -1; // bootstrap specifier not found; return unused index (-1) 1429 } // end find_matching_operand() 1430 1431 1432 #ifndef PRODUCT 1433 1434 const char* ConstantPool::printable_name_at(int which) { 1435 1436 constantTag tag = tag_at(which); 1437 1438 if (tag.is_string()) { 1439 return string_at_noresolve(which); 1440 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 1441 return klass_name_at(which)->as_C_string(); 1442 } else if (tag.is_symbol()) { 1443 return symbol_at(which)->as_C_string(); 1444 } 1445 return ""; 1446 } 1447 1448 #endif // PRODUCT 1449 1450 1451 // JVMTI GetConstantPool support 1452 1453 // For debugging of constant pool 1454 const bool debug_cpool = false; 1455 1456 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) 1457 1458 static void print_cpool_bytes(jint cnt, u1 *bytes) { 1459 const char* WARN_MSG = "Must not be such entry!"; 1460 jint size = 0; 1461 u2 idx1, idx2; 1462 1463 for (jint idx = 1; idx < cnt; idx++) { 1464 jint ent_size = 0; 1465 u1 tag = *bytes++; 1466 size++; // count tag 1467 1468 printf("const #%03d, tag: %02d ", idx, tag); 1469 switch(tag) { 1470 case JVM_CONSTANT_Invalid: { 1471 printf("Invalid"); 1472 break; 1473 } 1474 case JVM_CONSTANT_Unicode: { 1475 printf("Unicode %s", WARN_MSG); 1476 break; 1477 } 1478 case JVM_CONSTANT_Utf8: { 1479 u2 len = Bytes::get_Java_u2(bytes); 1480 char str[128]; 1481 if (len > 127) { 1482 len = 127; 1483 } 1484 strncpy(str, (char *) (bytes+2), len); 1485 str[len] = '\0'; 1486 printf("Utf8 \"%s\"", str); 1487 ent_size = 2 + len; 1488 break; 1489 } 1490 case JVM_CONSTANT_Integer: { 1491 u4 val = Bytes::get_Java_u4(bytes); 1492 printf("int %d", *(int *) &val); 1493 ent_size = 4; 1494 break; 1495 } 1496 case JVM_CONSTANT_Float: { 1497 u4 val = Bytes::get_Java_u4(bytes); 1498 printf("float %5.3ff", *(float *) &val); 1499 ent_size = 4; 1500 break; 1501 } 1502 case JVM_CONSTANT_Long: { 1503 u8 val = Bytes::get_Java_u8(bytes); 1504 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val); 1505 ent_size = 8; 1506 idx++; // Long takes two cpool slots 1507 break; 1508 } 1509 case JVM_CONSTANT_Double: { 1510 u8 val = Bytes::get_Java_u8(bytes); 1511 printf("double %5.3fd", *(jdouble *)&val); 1512 ent_size = 8; 1513 idx++; // Double takes two cpool slots 1514 break; 1515 } 1516 case JVM_CONSTANT_Class: { 1517 idx1 = Bytes::get_Java_u2(bytes); 1518 printf("class #%03d", idx1); 1519 ent_size = 2; 1520 break; 1521 } 1522 case JVM_CONSTANT_String: { 1523 idx1 = Bytes::get_Java_u2(bytes); 1524 printf("String #%03d", idx1); 1525 ent_size = 2; 1526 break; 1527 } 1528 case JVM_CONSTANT_Fieldref: { 1529 idx1 = Bytes::get_Java_u2(bytes); 1530 idx2 = Bytes::get_Java_u2(bytes+2); 1531 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); 1532 ent_size = 4; 1533 break; 1534 } 1535 case JVM_CONSTANT_Methodref: { 1536 idx1 = Bytes::get_Java_u2(bytes); 1537 idx2 = Bytes::get_Java_u2(bytes+2); 1538 printf("Method #%03d, #%03d", idx1, idx2); 1539 ent_size = 4; 1540 break; 1541 } 1542 case JVM_CONSTANT_InterfaceMethodref: { 1543 idx1 = Bytes::get_Java_u2(bytes); 1544 idx2 = Bytes::get_Java_u2(bytes+2); 1545 printf("InterfMethod #%03d, #%03d", idx1, idx2); 1546 ent_size = 4; 1547 break; 1548 } 1549 case JVM_CONSTANT_NameAndType: { 1550 idx1 = Bytes::get_Java_u2(bytes); 1551 idx2 = Bytes::get_Java_u2(bytes+2); 1552 printf("NameAndType #%03d, #%03d", idx1, idx2); 1553 ent_size = 4; 1554 break; 1555 } 1556 case JVM_CONSTANT_ClassIndex: { 1557 printf("ClassIndex %s", WARN_MSG); 1558 break; 1559 } 1560 case JVM_CONSTANT_UnresolvedClass: { 1561 printf("UnresolvedClass: %s", WARN_MSG); 1562 break; 1563 } 1564 case JVM_CONSTANT_UnresolvedClassInError: { 1565 printf("UnresolvedClassInErr: %s", WARN_MSG); 1566 break; 1567 } 1568 case JVM_CONSTANT_StringIndex: { 1569 printf("StringIndex: %s", WARN_MSG); 1570 break; 1571 } 1572 } 1573 printf(";\n"); 1574 bytes += ent_size; 1575 size += ent_size; 1576 } 1577 printf("Cpool size: %d\n", size); 1578 fflush(0); 1579 return; 1580 } /* end print_cpool_bytes */ 1581 1582 1583 // Returns size of constant pool entry. 1584 jint ConstantPool::cpool_entry_size(jint idx) { 1585 switch(tag_at(idx).value()) { 1586 case JVM_CONSTANT_Invalid: 1587 case JVM_CONSTANT_Unicode: 1588 return 1; 1589 1590 case JVM_CONSTANT_Utf8: 1591 return 3 + symbol_at(idx)->utf8_length(); 1592 1593 case JVM_CONSTANT_Class: 1594 case JVM_CONSTANT_String: 1595 case JVM_CONSTANT_ClassIndex: 1596 case JVM_CONSTANT_UnresolvedClass: 1597 case JVM_CONSTANT_UnresolvedClassInError: 1598 case JVM_CONSTANT_StringIndex: 1599 case JVM_CONSTANT_MethodType: 1600 case JVM_CONSTANT_MethodTypeInError: 1601 return 3; 1602 1603 case JVM_CONSTANT_MethodHandle: 1604 case JVM_CONSTANT_MethodHandleInError: 1605 return 4; //tag, ref_kind, ref_index 1606 1607 case JVM_CONSTANT_Integer: 1608 case JVM_CONSTANT_Float: 1609 case JVM_CONSTANT_Fieldref: 1610 case JVM_CONSTANT_Methodref: 1611 case JVM_CONSTANT_InterfaceMethodref: 1612 case JVM_CONSTANT_NameAndType: 1613 return 5; 1614 1615 case JVM_CONSTANT_InvokeDynamic: 1616 // u1 tag, u2 bsm, u2 nt 1617 return 5; 1618 1619 case JVM_CONSTANT_Long: 1620 case JVM_CONSTANT_Double: 1621 return 9; 1622 } 1623 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); 1624 return 1; 1625 } /* end cpool_entry_size */ 1626 1627 1628 // SymbolHashMap is used to find a constant pool index from a string. 1629 // This function fills in SymbolHashMaps, one for utf8s and one for 1630 // class names, returns size of the cpool raw bytes. 1631 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, 1632 SymbolHashMap *classmap) { 1633 jint size = 0; 1634 1635 for (u2 idx = 1; idx < length(); idx++) { 1636 u2 tag = tag_at(idx).value(); 1637 size += cpool_entry_size(idx); 1638 1639 switch(tag) { 1640 case JVM_CONSTANT_Utf8: { 1641 Symbol* sym = symbol_at(idx); 1642 symmap->add_entry(sym, idx); 1643 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); 1644 break; 1645 } 1646 case JVM_CONSTANT_Class: 1647 case JVM_CONSTANT_UnresolvedClass: 1648 case JVM_CONSTANT_UnresolvedClassInError: { 1649 Symbol* sym = klass_name_at(idx); 1650 classmap->add_entry(sym, idx); 1651 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); 1652 break; 1653 } 1654 case JVM_CONSTANT_Long: 1655 case JVM_CONSTANT_Double: { 1656 idx++; // Both Long and Double take two cpool slots 1657 break; 1658 } 1659 } 1660 } 1661 return size; 1662 } /* end hash_utf8_entries_to */ 1663 1664 1665 // Copy cpool bytes. 1666 // Returns: 1667 // 0, in case of OutOfMemoryError 1668 // -1, in case of internal error 1669 // > 0, count of the raw cpool bytes that have been copied 1670 int ConstantPool::copy_cpool_bytes(int cpool_size, 1671 SymbolHashMap* tbl, 1672 unsigned char *bytes) { 1673 u2 idx1, idx2; 1674 jint size = 0; 1675 jint cnt = length(); 1676 unsigned char *start_bytes = bytes; 1677 1678 for (jint idx = 1; idx < cnt; idx++) { 1679 u1 tag = tag_at(idx).value(); 1680 jint ent_size = cpool_entry_size(idx); 1681 1682 assert(size + ent_size <= cpool_size, "Size mismatch"); 1683 1684 *bytes = tag; 1685 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); 1686 switch(tag) { 1687 case JVM_CONSTANT_Invalid: { 1688 DBG(printf("JVM_CONSTANT_Invalid")); 1689 break; 1690 } 1691 case JVM_CONSTANT_Unicode: { 1692 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); 1693 DBG(printf("JVM_CONSTANT_Unicode")); 1694 break; 1695 } 1696 case JVM_CONSTANT_Utf8: { 1697 Symbol* sym = symbol_at(idx); 1698 char* str = sym->as_utf8(); 1699 // Warning! It's crashing on x86 with len = sym->utf8_length() 1700 int len = (int) strlen(str); 1701 Bytes::put_Java_u2((address) (bytes+1), (u2) len); 1702 for (int i = 0; i < len; i++) { 1703 bytes[3+i] = (u1) str[i]; 1704 } 1705 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); 1706 break; 1707 } 1708 case JVM_CONSTANT_Integer: { 1709 jint val = int_at(idx); 1710 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1711 break; 1712 } 1713 case JVM_CONSTANT_Float: { 1714 jfloat val = float_at(idx); 1715 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1716 break; 1717 } 1718 case JVM_CONSTANT_Long: { 1719 jlong val = long_at(idx); 1720 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1721 idx++; // Long takes two cpool slots 1722 break; 1723 } 1724 case JVM_CONSTANT_Double: { 1725 jdouble val = double_at(idx); 1726 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1727 idx++; // Double takes two cpool slots 1728 break; 1729 } 1730 case JVM_CONSTANT_Class: 1731 case JVM_CONSTANT_UnresolvedClass: 1732 case JVM_CONSTANT_UnresolvedClassInError: { 1733 *bytes = JVM_CONSTANT_Class; 1734 Symbol* sym = klass_name_at(idx); 1735 idx1 = tbl->symbol_to_value(sym); 1736 assert(idx1 != 0, "Have not found a hashtable entry"); 1737 Bytes::put_Java_u2((address) (bytes+1), idx1); 1738 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); 1739 break; 1740 } 1741 case JVM_CONSTANT_String: { 1742 *bytes = JVM_CONSTANT_String; 1743 Symbol* sym = unresolved_string_at(idx); 1744 idx1 = tbl->symbol_to_value(sym); 1745 assert(idx1 != 0, "Have not found a hashtable entry"); 1746 Bytes::put_Java_u2((address) (bytes+1), idx1); 1747 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); 1748 break; 1749 } 1750 case JVM_CONSTANT_Fieldref: 1751 case JVM_CONSTANT_Methodref: 1752 case JVM_CONSTANT_InterfaceMethodref: { 1753 idx1 = uncached_klass_ref_index_at(idx); 1754 idx2 = uncached_name_and_type_ref_index_at(idx); 1755 Bytes::put_Java_u2((address) (bytes+1), idx1); 1756 Bytes::put_Java_u2((address) (bytes+3), idx2); 1757 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); 1758 break; 1759 } 1760 case JVM_CONSTANT_NameAndType: { 1761 idx1 = name_ref_index_at(idx); 1762 idx2 = signature_ref_index_at(idx); 1763 Bytes::put_Java_u2((address) (bytes+1), idx1); 1764 Bytes::put_Java_u2((address) (bytes+3), idx2); 1765 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); 1766 break; 1767 } 1768 case JVM_CONSTANT_ClassIndex: { 1769 *bytes = JVM_CONSTANT_Class; 1770 idx1 = klass_index_at(idx); 1771 Bytes::put_Java_u2((address) (bytes+1), idx1); 1772 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); 1773 break; 1774 } 1775 case JVM_CONSTANT_StringIndex: { 1776 *bytes = JVM_CONSTANT_String; 1777 idx1 = string_index_at(idx); 1778 Bytes::put_Java_u2((address) (bytes+1), idx1); 1779 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); 1780 break; 1781 } 1782 case JVM_CONSTANT_MethodHandle: 1783 case JVM_CONSTANT_MethodHandleInError: { 1784 *bytes = JVM_CONSTANT_MethodHandle; 1785 int kind = method_handle_ref_kind_at_error_ok(idx); 1786 idx1 = method_handle_index_at_error_ok(idx); 1787 *(bytes+1) = (unsigned char) kind; 1788 Bytes::put_Java_u2((address) (bytes+2), idx1); 1789 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); 1790 break; 1791 } 1792 case JVM_CONSTANT_MethodType: 1793 case JVM_CONSTANT_MethodTypeInError: { 1794 *bytes = JVM_CONSTANT_MethodType; 1795 idx1 = method_type_index_at_error_ok(idx); 1796 Bytes::put_Java_u2((address) (bytes+1), idx1); 1797 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); 1798 break; 1799 } 1800 case JVM_CONSTANT_InvokeDynamic: { 1801 *bytes = tag; 1802 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 1803 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 1804 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); 1805 Bytes::put_Java_u2((address) (bytes+1), idx1); 1806 Bytes::put_Java_u2((address) (bytes+3), idx2); 1807 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); 1808 break; 1809 } 1810 } 1811 DBG(printf("\n")); 1812 bytes += ent_size; 1813 size += ent_size; 1814 } 1815 assert(size == cpool_size, "Size mismatch"); 1816 1817 // Keep temorarily for debugging until it's stable. 1818 DBG(print_cpool_bytes(cnt, start_bytes)); 1819 return (int)(bytes - start_bytes); 1820 } /* end copy_cpool_bytes */ 1821 1822 #undef DBG 1823 1824 1825 void ConstantPool::set_on_stack(const bool value) { 1826 if (value) { 1827 // Only record if it's not already set. 1828 if (!on_stack()) { 1829 _flags |= _on_stack; 1830 MetadataOnStackMark::record(this); 1831 } 1832 } else { 1833 // Clearing is done single-threadedly. 1834 _flags &= ~_on_stack; 1835 } 1836 } 1837 1838 // JSR 292 support for patching constant pool oops after the class is linked and 1839 // the oop array for resolved references are created. 1840 // We can't do this during classfile parsing, which is how the other indexes are 1841 // patched. The other patches are applied early for some error checking 1842 // so only defer the pseudo_strings. 1843 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) { 1844 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused 1845 Handle patch = cp_patches->at(index); 1846 if (patch.not_null()) { 1847 assert (tag_at(index).is_string(), "should only be string left"); 1848 // Patching a string means pre-resolving it. 1849 // The spelling in the constant pool is ignored. 1850 // The constant reference may be any object whatever. 1851 // If it is not a real interned string, the constant is referred 1852 // to as a "pseudo-string", and must be presented to the CP 1853 // explicitly, because it may require scavenging. 1854 int obj_index = cp_to_object_index(index); 1855 pseudo_string_at_put(index, obj_index, patch()); 1856 DEBUG_ONLY(cp_patches->at_put(index, Handle());) 1857 } 1858 } 1859 #ifdef ASSERT 1860 // Ensure that all the patches have been used. 1861 for (int index = 0; index < cp_patches->length(); index++) { 1862 assert(cp_patches->at(index).is_null(), 1863 "Unused constant pool patch at %d in class file %s", 1864 index, 1865 pool_holder()->external_name()); 1866 } 1867 #endif // ASSERT 1868 } 1869 1870 #ifndef PRODUCT 1871 1872 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool 1873 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { 1874 guarantee(obj->is_constantPool(), "object must be constant pool"); 1875 constantPoolHandle cp(THREAD, (ConstantPool*)obj); 1876 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); 1877 1878 for (int i = 0; i< cp->length(); i++) { 1879 if (cp->tag_at(i).is_unresolved_klass()) { 1880 // This will force loading of the class 1881 Klass* klass = cp->klass_at(i, CHECK); 1882 if (klass->is_instance_klass()) { 1883 // Force initialization of class 1884 InstanceKlass::cast(klass)->initialize(CHECK); 1885 } 1886 } 1887 } 1888 } 1889 1890 #endif 1891 1892 1893 // Printing 1894 1895 void ConstantPool::print_on(outputStream* st) const { 1896 assert(is_constantPool(), "must be constantPool"); 1897 st->print_cr("%s", internal_name()); 1898 if (flags() != 0) { 1899 st->print(" - flags: 0x%x", flags()); 1900 if (has_preresolution()) st->print(" has_preresolution"); 1901 if (on_stack()) st->print(" on_stack"); 1902 st->cr(); 1903 } 1904 if (pool_holder() != NULL) { 1905 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder())); 1906 } 1907 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache())); 1908 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references())); 1909 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map())); 1910 1911 for (int index = 1; index < length(); index++) { // Index 0 is unused 1912 ((ConstantPool*)this)->print_entry_on(index, st); 1913 switch (tag_at(index).value()) { 1914 case JVM_CONSTANT_Long : 1915 case JVM_CONSTANT_Double : 1916 index++; // Skip entry following eigth-byte constant 1917 } 1918 1919 } 1920 st->cr(); 1921 } 1922 1923 // Print one constant pool entry 1924 void ConstantPool::print_entry_on(const int index, outputStream* st) { 1925 EXCEPTION_MARK; 1926 st->print(" - %3d : ", index); 1927 tag_at(index).print_on(st); 1928 st->print(" : "); 1929 switch (tag_at(index).value()) { 1930 case JVM_CONSTANT_Class : 1931 { Klass* k = klass_at(index, CATCH); 1932 guarantee(k != NULL, "need klass"); 1933 k->print_value_on(st); 1934 st->print(" {" PTR_FORMAT "}", p2i(k)); 1935 } 1936 break; 1937 case JVM_CONSTANT_Fieldref : 1938 case JVM_CONSTANT_Methodref : 1939 case JVM_CONSTANT_InterfaceMethodref : 1940 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); 1941 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); 1942 break; 1943 case JVM_CONSTANT_String : 1944 if (is_pseudo_string_at(index)) { 1945 oop anObj = pseudo_string_at(index); 1946 anObj->print_value_on(st); 1947 st->print(" {" PTR_FORMAT "}", p2i(anObj)); 1948 } else { 1949 unresolved_string_at(index)->print_value_on(st); 1950 } 1951 break; 1952 case JVM_CONSTANT_Integer : 1953 st->print("%d", int_at(index)); 1954 break; 1955 case JVM_CONSTANT_Float : 1956 st->print("%f", float_at(index)); 1957 break; 1958 case JVM_CONSTANT_Long : 1959 st->print_jlong(long_at(index)); 1960 break; 1961 case JVM_CONSTANT_Double : 1962 st->print("%lf", double_at(index)); 1963 break; 1964 case JVM_CONSTANT_NameAndType : 1965 st->print("name_index=%d", name_ref_index_at(index)); 1966 st->print(" signature_index=%d", signature_ref_index_at(index)); 1967 break; 1968 case JVM_CONSTANT_Utf8 : 1969 symbol_at(index)->print_value_on(st); 1970 break; 1971 case JVM_CONSTANT_UnresolvedClass : // fall-through 1972 case JVM_CONSTANT_UnresolvedClassInError: { 1973 CPSlot entry = slot_at(index); 1974 if (entry.is_resolved()) { 1975 entry.get_klass()->print_value_on(st); 1976 } else { 1977 entry.get_symbol()->print_value_on(st); 1978 } 1979 } 1980 break; 1981 case JVM_CONSTANT_MethodHandle : 1982 case JVM_CONSTANT_MethodHandleInError : 1983 st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index)); 1984 st->print(" ref_index=%d", method_handle_index_at_error_ok(index)); 1985 break; 1986 case JVM_CONSTANT_MethodType : 1987 case JVM_CONSTANT_MethodTypeInError : 1988 st->print("signature_index=%d", method_type_index_at_error_ok(index)); 1989 break; 1990 case JVM_CONSTANT_InvokeDynamic : 1991 { 1992 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); 1993 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); 1994 int argc = invoke_dynamic_argument_count_at(index); 1995 if (argc > 0) { 1996 for (int arg_i = 0; arg_i < argc; arg_i++) { 1997 int arg = invoke_dynamic_argument_index_at(index, arg_i); 1998 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 1999 } 2000 st->print("}"); 2001 } 2002 } 2003 break; 2004 default: 2005 ShouldNotReachHere(); 2006 break; 2007 } 2008 st->cr(); 2009 } 2010 2011 void ConstantPool::print_value_on(outputStream* st) const { 2012 assert(is_constantPool(), "must be constantPool"); 2013 st->print("constant pool [%d]", length()); 2014 if (has_preresolution()) st->print("/preresolution"); 2015 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); 2016 print_address_on(st); 2017 st->print(" for "); 2018 pool_holder()->print_value_on(st); 2019 if (pool_holder() != NULL) { 2020 bool extra = (pool_holder()->constants() != this); 2021 if (extra) st->print(" (extra)"); 2022 } 2023 if (cache() != NULL) { 2024 st->print(" cache=" PTR_FORMAT, p2i(cache())); 2025 } 2026 } 2027 2028 #if INCLUDE_SERVICES 2029 // Size Statistics 2030 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { 2031 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); 2032 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); 2033 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); 2034 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); 2035 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); 2036 2037 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + 2038 sz->_cp_refmap_bytes; 2039 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; 2040 } 2041 #endif // INCLUDE_SERVICES 2042 2043 // Verification 2044 2045 void ConstantPool::verify_on(outputStream* st) { 2046 guarantee(is_constantPool(), "object must be constant pool"); 2047 for (int i = 0; i< length(); i++) { 2048 constantTag tag = tag_at(i); 2049 CPSlot entry = slot_at(i); 2050 if (tag.is_klass()) { 2051 if (entry.is_resolved()) { 2052 guarantee(entry.get_klass()->is_klass(), "should be klass"); 2053 } 2054 } else if (tag.is_unresolved_klass()) { 2055 if (entry.is_resolved()) { 2056 guarantee(entry.get_klass()->is_klass(), "should be klass"); 2057 } 2058 } else if (tag.is_symbol()) { 2059 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2060 } else if (tag.is_string()) { 2061 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2062 } 2063 } 2064 if (cache() != NULL) { 2065 // Note: cache() can be NULL before a class is completely setup or 2066 // in temporary constant pools used during constant pool merging 2067 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); 2068 } 2069 if (pool_holder() != NULL) { 2070 // Note: pool_holder() can be NULL in temporary constant pools 2071 // used during constant pool merging 2072 guarantee(pool_holder()->is_klass(), "should be klass"); 2073 } 2074 } 2075 2076 2077 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { 2078 char *str = sym->as_utf8(); 2079 unsigned int hash = compute_hash(str, sym->utf8_length()); 2080 unsigned int index = hash % table_size(); 2081 2082 // check if already in map 2083 // we prefer the first entry since it is more likely to be what was used in 2084 // the class file 2085 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2086 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2087 if (en->hash() == hash && en->symbol() == sym) { 2088 return; // already there 2089 } 2090 } 2091 2092 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); 2093 entry->set_next(bucket(index)); 2094 _buckets[index].set_entry(entry); 2095 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2096 } 2097 2098 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { 2099 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); 2100 char *str = sym->as_utf8(); 2101 int len = sym->utf8_length(); 2102 unsigned int hash = SymbolHashMap::compute_hash(str, len); 2103 unsigned int index = hash % table_size(); 2104 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2105 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2106 if (en->hash() == hash && en->symbol() == sym) { 2107 return en; 2108 } 2109 } 2110 return NULL; 2111 }