1 /* 2 * Copyright (c) 1997, 2023, 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 "cds/archiveHeapLoader.hpp" 27 #include "cds/archiveBuilder.hpp" 28 #include "cds/classPrelinker.hpp" 29 #include "cds/heapShared.hpp" 30 #include "classfile/classLoaderData.hpp" 31 #include "classfile/javaClasses.inline.hpp" 32 #include "classfile/metadataOnStackMark.hpp" 33 #include "classfile/stringTable.hpp" 34 #include "classfile/systemDictionary.hpp" 35 #include "classfile/vmClasses.hpp" 36 #include "classfile/vmSymbols.hpp" 37 #include "code/codeCache.hpp" 38 #include "interpreter/bootstrapInfo.hpp" 39 #include "interpreter/linkResolver.hpp" 40 #include "jvm.h" 41 #include "logging/log.hpp" 42 #include "logging/logStream.hpp" 43 #include "memory/allocation.inline.hpp" 44 #include "memory/metadataFactory.hpp" 45 #include "memory/metaspaceClosure.hpp" 46 #include "memory/oopFactory.hpp" 47 #include "memory/resourceArea.hpp" 48 #include "memory/universe.hpp" 49 #include "oops/array.hpp" 50 #include "oops/constantPool.inline.hpp" 51 #include "oops/cpCache.inline.hpp" 52 #include "oops/flatArrayKlass.hpp" 53 #include "oops/instanceKlass.hpp" 54 #include "oops/klass.inline.hpp" 55 #include "oops/objArrayKlass.hpp" 56 #include "oops/objArrayOop.inline.hpp" 57 #include "oops/oop.inline.hpp" 58 #include "oops/typeArrayOop.inline.hpp" 59 #include "prims/jvmtiExport.hpp" 60 #include "runtime/atomic.hpp" 61 #include "runtime/handles.inline.hpp" 62 #include "runtime/init.hpp" 63 #include "runtime/javaCalls.hpp" 64 #include "runtime/javaThread.hpp" 65 #include "runtime/signature.hpp" 66 #include "runtime/vframe.inline.hpp" 67 #include "utilities/copy.hpp" 68 69 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { 70 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL); 71 int size = ConstantPool::size(length); 72 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); 73 } 74 75 void ConstantPool::copy_fields(const ConstantPool* orig) { 76 // Preserve dynamic constant information from the original pool 77 if (orig->has_dynamic_constant()) { 78 set_has_dynamic_constant(); 79 } 80 81 set_major_version(orig->major_version()); 82 set_minor_version(orig->minor_version()); 83 84 set_source_file_name_index(orig->source_file_name_index()); 85 set_generic_signature_index(orig->generic_signature_index()); 86 } 87 88 #ifdef ASSERT 89 90 // MetaspaceObj allocation invariant is calloc equivalent memory 91 // simple verification of this here (JVM_CONSTANT_Invalid == 0 ) 92 static bool tag_array_is_zero_initialized(Array<u1>* tags) { 93 assert(tags != NULL, "invariant"); 94 const int length = tags->length(); 95 for (int index = 0; index < length; ++index) { 96 if (JVM_CONSTANT_Invalid != tags->at(index)) { 97 return false; 98 } 99 } 100 return true; 101 } 102 103 #endif 104 105 ConstantPool::ConstantPool(Array<u1>* tags) : 106 _tags(tags), 107 _length(tags->length()) { 108 109 assert(_tags != NULL, "invariant"); 110 assert(tags->length() == _length, "invariant"); 111 assert(tag_array_is_zero_initialized(tags), "invariant"); 112 assert(0 == flags(), "invariant"); 113 assert(0 == version(), "invariant"); 114 assert(NULL == _pool_holder, "invariant"); 115 } 116 117 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { 118 if (cache() != NULL) { 119 MetadataFactory::free_metadata(loader_data, cache()); 120 set_cache(NULL); 121 } 122 123 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses()); 124 set_resolved_klasses(NULL); 125 126 MetadataFactory::free_array<jushort>(loader_data, operands()); 127 set_operands(NULL); 128 129 release_C_heap_structures(); 130 131 // free tag array 132 MetadataFactory::free_array<u1>(loader_data, tags()); 133 set_tags(NULL); 134 } 135 136 void ConstantPool::release_C_heap_structures() { 137 // walk constant pool and decrement symbol reference counts 138 unreference_symbols(); 139 } 140 141 void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) { 142 log_trace(cds)("Iter(ConstantPool): %p", this); 143 144 it->push(&_tags, MetaspaceClosure::_writable); 145 it->push(&_cache); 146 it->push(&_pool_holder); 147 it->push(&_operands); 148 it->push(&_resolved_klasses, MetaspaceClosure::_writable); 149 150 for (int i = 0; i < length(); i++) { 151 // The only MSO's embedded in the CP entries are Symbols: 152 // JVM_CONSTANT_String (normal and pseudo) 153 // JVM_CONSTANT_Utf8 154 constantTag ctag = tag_at(i); 155 if (ctag.is_string() || ctag.is_utf8()) { 156 it->push(symbol_at_addr(i)); 157 } 158 } 159 } 160 161 objArrayOop ConstantPool::resolved_references() const { 162 return _cache->resolved_references(); 163 } 164 165 // Called from outside constant pool resolution where a resolved_reference array 166 // may not be present. 167 objArrayOop ConstantPool::resolved_references_or_null() const { 168 if (_cache == NULL) { 169 return NULL; 170 } else { 171 return _cache->resolved_references(); 172 } 173 } 174 175 oop ConstantPool::resolved_reference_at(int index) const { 176 oop result = resolved_references()->obj_at(index); 177 assert(oopDesc::is_oop_or_null(result), "Must be oop"); 178 return result; 179 } 180 181 // Use a CAS for multithreaded access 182 oop ConstantPool::set_resolved_reference_at(int index, oop new_result) { 183 assert(oopDesc::is_oop_or_null(new_result), "Must be oop"); 184 return resolved_references()->replace_if_null(index, new_result); 185 } 186 187 // Create resolved_references array and mapping array for original cp indexes 188 // The ldc bytecode was rewritten to have the resolved reference array index so need a way 189 // to map it back for resolving and some unlikely miscellaneous uses. 190 // The objects created by invokedynamic are appended to this list. 191 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, 192 const intStack& reference_map, 193 int constant_pool_map_length, 194 TRAPS) { 195 // Initialized the resolved object cache. 196 int map_length = reference_map.length(); 197 if (map_length > 0) { 198 // Only need mapping back to constant pool entries. The map isn't used for 199 // invokedynamic resolved_reference entries. For invokedynamic entries, 200 // the constant pool cache index has the mapping back to both the constant 201 // pool and to the resolved reference index. 202 if (constant_pool_map_length > 0) { 203 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK); 204 205 for (int i = 0; i < constant_pool_map_length; i++) { 206 int x = reference_map.at(i); 207 assert(x == (int)(jushort) x, "klass index is too big"); 208 om->at_put(i, (jushort)x); 209 } 210 set_reference_map(om); 211 } 212 213 // Create Java array for holding resolved strings, methodHandles, 214 // methodTypes, invokedynamic and invokehandle appendix objects, etc. 215 objArrayOop stom = oopFactory::new_objArray(vmClasses::Object_klass(), map_length, CHECK); 216 Handle refs_handle (THREAD, stom); // must handleize. 217 set_resolved_references(loader_data->add_handle(refs_handle)); 218 } 219 } 220 221 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) { 222 // A ConstantPool can't possibly have 0xffff valid class entries, 223 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8 224 // entry for the class's name. So at most we will have 0xfffe class entries. 225 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate 226 // UnresolvedKlass entries that are temporarily created during class redefinition. 227 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity"); 228 assert(resolved_klasses() == NULL, "sanity"); 229 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK); 230 set_resolved_klasses(rk); 231 } 232 233 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) { 234 int len = length(); 235 int num_klasses = 0; 236 for (int i = 1; i <len; i++) { 237 switch (tag_at(i).value()) { 238 case JVM_CONSTANT_ClassIndex: 239 { 240 const int class_index = klass_index_at(i); 241 unresolved_klass_at_put(i, class_index, num_klasses++); 242 } 243 break; 244 #ifndef PRODUCT 245 case JVM_CONSTANT_Class: 246 case JVM_CONSTANT_UnresolvedClass: 247 case JVM_CONSTANT_UnresolvedClassInError: 248 // All of these should have been reverted back to Unresolved before calling 249 // this function. 250 ShouldNotReachHere(); 251 #endif 252 } 253 } 254 allocate_resolved_klasses(loader_data, num_klasses, THREAD); 255 } 256 257 // Hidden class support: 258 void ConstantPool::klass_at_put(int class_index, Klass* k) { 259 assert(k != NULL, "must be valid klass"); 260 CPKlassSlot kslot = klass_slot_at(class_index); 261 int resolved_klass_index = kslot.resolved_klass_index(); 262 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index); 263 Atomic::release_store(adr, k); 264 265 // The interpreter assumes when the tag is stored, the klass is resolved 266 // and the Klass* non-NULL, so we need hardware store ordering here. 267 assert(!k->name()->is_Q_signature(), "Q-type without JVM_CONSTANT_QDescBit"); 268 release_tag_at_put(class_index, JVM_CONSTANT_Class); 269 } 270 271 #if INCLUDE_CDS_JAVA_HEAP 272 // Archive the resolved references 273 void ConstantPool::archive_resolved_references() { 274 if (_cache == NULL) { 275 return; // nothing to do 276 } 277 278 InstanceKlass *ik = pool_holder(); 279 if (!(ik->is_shared_boot_class() || ik->is_shared_platform_class() || 280 ik->is_shared_app_class())) { 281 // Archiving resolved references for classes from non-builtin loaders 282 // is not yet supported. 283 return; 284 } 285 286 objArrayOop rr = resolved_references(); 287 Array<u2>* ref_map = reference_map(); 288 if (rr != NULL) { 289 int ref_map_len = ref_map == NULL ? 0 : ref_map->length(); 290 int rr_len = rr->length(); 291 for (int i = 0; i < rr_len; i++) { 292 oop obj = rr->obj_at(i); 293 rr->obj_at_put(i, NULL); 294 if (obj != NULL && i < ref_map_len) { 295 int index = object_to_cp_index(i); 296 if (tag_at(index).is_string()) { 297 oop archived_string = HeapShared::find_archived_heap_object(obj); 298 // Update the reference to point to the archived copy 299 // of this string. 300 // If the string is too large to archive, NULL is 301 // stored into rr. At run time, string_at_impl() will create and intern 302 // the string. 303 rr->obj_at_put(i, archived_string); 304 } 305 } 306 } 307 308 oop archived = HeapShared::archive_object(rr); 309 // If the resolved references array is not archived (too large), 310 // the 'archived' object is NULL. No need to explicitly check 311 // the return value of archive_object() here. At runtime, the 312 // resolved references will be created using the normal process 313 // when there is no archived value. 314 _cache->set_archived_references(archived); 315 } 316 } 317 318 void ConstantPool::add_dumped_interned_strings() { 319 objArrayOop rr = resolved_references(); 320 if (rr != NULL) { 321 int rr_len = rr->length(); 322 for (int i = 0; i < rr_len; i++) { 323 oop p = rr->obj_at(i); 324 if (java_lang_String::is_instance(p)) { 325 HeapShared::add_to_dumped_interned_strings(p); 326 } 327 } 328 } 329 } 330 #endif 331 332 #if INCLUDE_CDS 333 // CDS support. Create a new resolved_references array. 334 void ConstantPool::restore_unshareable_info(TRAPS) { 335 if (!_pool_holder->is_linked() && !_pool_holder->is_rewritten()) { 336 return; 337 } 338 assert(is_constantPool(), "ensure C++ vtable is restored"); 339 assert(on_stack(), "should always be set for shared constant pools"); 340 assert(is_shared(), "should always be set for shared constant pools"); 341 assert(_cache != NULL, "constant pool _cache should not be NULL"); 342 343 // Only create the new resolved references array if it hasn't been attempted before 344 if (resolved_references() != NULL) return; 345 346 if (vmClasses::Object_klass_loaded()) { 347 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 348 #if INCLUDE_CDS_JAVA_HEAP 349 if (ArchiveHeapLoader::is_fully_available() && 350 _cache->archived_references() != NULL) { 351 oop archived = _cache->archived_references(); 352 // Create handle for the archived resolved reference array object 353 Handle refs_handle(THREAD, archived); 354 set_resolved_references(loader_data->add_handle(refs_handle)); 355 _cache->clear_archived_references(); 356 } else 357 #endif 358 { 359 // No mapped archived resolved reference array 360 // Recreate the object array and add to ClassLoaderData. 361 int map_length = resolved_reference_length(); 362 if (map_length > 0) { 363 objArrayOop stom = oopFactory::new_objArray(vmClasses::Object_klass(), map_length, CHECK); 364 Handle refs_handle(THREAD, stom); // must handleize. 365 set_resolved_references(loader_data->add_handle(refs_handle)); 366 } 367 } 368 } 369 } 370 371 void ConstantPool::remove_unshareable_info() { 372 // Shared ConstantPools are in the RO region, so the _flags cannot be modified. 373 // The _on_stack flag is used to prevent ConstantPools from deallocation during 374 // class redefinition. Since shared ConstantPools cannot be deallocated anyway, 375 // we always set _on_stack to true to avoid having to change _flags during runtime. 376 _flags |= (_on_stack | _is_shared); 377 378 if (!_pool_holder->is_linked() && !_pool_holder->verified_at_dump_time()) { 379 return; 380 } 381 // Resolved references are not in the shared archive. 382 // Save the length for restoration. It is not necessarily the same length 383 // as reference_map.length() if invokedynamic is saved. It is needed when 384 // re-creating the resolved reference array if archived heap data cannot be map 385 // at runtime. 386 set_resolved_reference_length( 387 resolved_references() != NULL ? resolved_references()->length() : 0); 388 set_resolved_references(OopHandle()); 389 390 bool archived = false; 391 for (int index = 1; index < length(); index++) { // Index 0 is unused 392 switch (tag_at(index).value()) { 393 case JVM_CONSTANT_UnresolvedClassInError: 394 { 395 jbyte qdesc_bit = tag_at(index).is_Qdescriptor_klass() ? (jbyte) JVM_CONSTANT_QDescBit : 0; 396 tag_at_put(index, JVM_CONSTANT_UnresolvedClass | qdesc_bit); 397 } 398 break; 399 case JVM_CONSTANT_MethodHandleInError: 400 tag_at_put(index, JVM_CONSTANT_MethodHandle); 401 break; 402 case JVM_CONSTANT_MethodTypeInError: 403 tag_at_put(index, JVM_CONSTANT_MethodType); 404 break; 405 case JVM_CONSTANT_DynamicInError: 406 tag_at_put(index, JVM_CONSTANT_Dynamic); 407 break; 408 case JVM_CONSTANT_Class: 409 archived = maybe_archive_resolved_klass_at(index); 410 ArchiveBuilder::alloc_stats()->record_klass_cp_entry(archived); 411 break; 412 } 413 } 414 415 if (cache() != NULL) { 416 // cache() is NULL if this class is not yet linked. 417 cache()->remove_unshareable_info(); 418 } 419 } 420 421 bool ConstantPool::maybe_archive_resolved_klass_at(int cp_index) { 422 assert(ArchiveBuilder::current()->is_in_buffer_space(this), "must be"); 423 assert(tag_at(cp_index).is_klass(), "must be resolved"); 424 425 if (pool_holder()->is_hidden() && cp_index == pool_holder()->this_class_index()) { 426 // All references to a hidden class's own field/methods are through this 427 // index, which was resolved in ClassFileParser::fill_instance_klass. We 428 // must preserve it. 429 return true; 430 } 431 432 CPKlassSlot kslot = klass_slot_at(cp_index); 433 int resolved_klass_index = kslot.resolved_klass_index(); 434 Klass* k = resolved_klasses()->at(resolved_klass_index); 435 // k could be NULL if the referenced class has been excluded via 436 // SystemDictionaryShared::is_excluded_class(). 437 438 if (k != NULL) { 439 ConstantPool* src_cp = ArchiveBuilder::current()->get_source_addr(this); 440 if (ClassPrelinker::can_archive_resolved_klass(src_cp, cp_index)) { 441 if (log_is_enabled(Debug, cds, resolve)) { 442 ResourceMark rm; 443 log_debug(cds, resolve)("Resolved klass CP entry [%d]: %s => %s", cp_index, 444 pool_holder()->external_name(), k->external_name()); 445 } 446 return true; 447 } 448 } 449 450 // This referenced class cannot be archived. Revert the tag to UnresolvedClass, 451 // so that the proper class loading and initialization can happen at runtime. 452 resolved_klasses()->at_put(resolved_klass_index, NULL); 453 jbyte qdesc_bit = tag_at(cp_index).is_Qdescriptor_klass() ? (jbyte) JVM_CONSTANT_QDescBit : 0; 454 tag_at_put(cp_index, JVM_CONSTANT_UnresolvedClass | qdesc_bit); 455 return false; 456 } 457 #endif // INCLUDE_CDS 458 459 int ConstantPool::cp_to_object_index(int cp_index) { 460 // this is harder don't do this so much. 461 int i = reference_map()->find(cp_index); 462 // We might not find the index for jsr292 call. 463 return (i < 0) ? _no_index_sentinel : i; 464 } 465 466 void ConstantPool::string_at_put(int which, int obj_index, oop str) { 467 oop result = set_resolved_reference_at(obj_index, str); 468 assert(result == nullptr || result == str, "Only set once or to the same string."); 469 } 470 471 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) { 472 ResourceMark rm; 473 int line_number = -1; 474 const char * source_file = NULL; 475 if (JavaThread::current()->has_last_Java_frame()) { 476 // try to identify the method which called this function. 477 vframeStream vfst(JavaThread::current()); 478 if (!vfst.at_end()) { 479 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 480 Symbol* s = vfst.method()->method_holder()->source_file_name(); 481 if (s != NULL) { 482 source_file = s->as_C_string(); 483 } 484 } 485 } 486 if (k != this_cp->pool_holder()) { 487 // only print something if the classes are different 488 if (source_file != NULL) { 489 log_debug(class, resolve)("%s %s %s:%d", 490 this_cp->pool_holder()->external_name(), 491 k->external_name(), source_file, line_number); 492 } else { 493 log_debug(class, resolve)("%s %s", 494 this_cp->pool_holder()->external_name(), 495 k->external_name()); 496 } 497 } 498 } 499 500 void check_is_inline_type(Klass* k, TRAPS) { 501 if (!k->is_inline_klass()) { 502 THROW(vmSymbols::java_lang_IncompatibleClassChangeError()); 503 } 504 } 505 506 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which, 507 TRAPS) { 508 JavaThread* javaThread = THREAD; 509 510 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 511 // It is not safe to rely on the tag bit's here, since we don't have a lock, and 512 // the entry and tag is not updated atomically. 513 CPKlassSlot kslot = this_cp->klass_slot_at(which); 514 int resolved_klass_index = kslot.resolved_klass_index(); 515 int name_index = kslot.name_index(); 516 assert(this_cp->tag_at(name_index).is_symbol(), "sanity"); 517 518 // The tag must be JVM_CONSTANT_Class in order to read the correct value from 519 // the unresolved_klasses() array. 520 if (this_cp->tag_at(which).is_klass()) { 521 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index); 522 if (klass != NULL) { 523 return klass; 524 } 525 } 526 527 // This tag doesn't change back to unresolved class unless at a safepoint. 528 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) { 529 // The original attempt to resolve this constant pool entry failed so find the 530 // class of the original error and throw another error of the same class 531 // (JVMS 5.4.3). 532 // If there is a detail message, pass that detail message to the error. 533 // The JVMS does not strictly require us to duplicate the same detail message, 534 // or any internal exception fields such as cause or stacktrace. But since the 535 // detail message is often a class name or other literal string, we will repeat it 536 // if we can find it in the symbol table. 537 throw_resolution_error(this_cp, which, CHECK_NULL); 538 ShouldNotReachHere(); 539 } 540 541 Handle mirror_handle; 542 Symbol* name = this_cp->symbol_at(name_index); 543 bool inline_type_signature = false; 544 if (name->is_Q_signature()) { 545 name = name->fundamental_name(THREAD); 546 inline_type_signature = true; 547 } 548 Handle loader (THREAD, this_cp->pool_holder()->class_loader()); 549 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain()); 550 551 Klass* k; 552 { 553 // Turn off the single stepping while doing class resolution 554 JvmtiHideSingleStepping jhss(javaThread); 555 k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD); 556 } // JvmtiHideSingleStepping jhss(javaThread); 557 if (inline_type_signature) { 558 name->decrement_refcount(); 559 } 560 561 if (!HAS_PENDING_EXCEPTION) { 562 // preserve the resolved klass from unloading 563 mirror_handle = Handle(THREAD, k->java_mirror()); 564 // Do access check for klasses 565 verify_constant_pool_resolve(this_cp, k, THREAD); 566 } 567 568 if (!HAS_PENDING_EXCEPTION && inline_type_signature) { 569 check_is_inline_type(k, THREAD); 570 } 571 572 if (!HAS_PENDING_EXCEPTION) { 573 Klass* bottom_klass = NULL; 574 if (k->is_objArray_klass()) { 575 bottom_klass = ObjArrayKlass::cast(k)->bottom_klass(); 576 assert(bottom_klass != NULL, "Should be set"); 577 assert(bottom_klass->is_instance_klass() || bottom_klass->is_typeArray_klass(), "Sanity check"); 578 } else if (k->is_flatArray_klass()) { 579 bottom_klass = FlatArrayKlass::cast(k)->element_klass(); 580 assert(bottom_klass != NULL, "Should be set"); 581 } 582 } 583 584 // Failed to resolve class. We must record the errors so that subsequent attempts 585 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). 586 if (HAS_PENDING_EXCEPTION) { 587 jbyte tag = JVM_CONSTANT_UnresolvedClass; 588 if (this_cp->tag_at(which).is_Qdescriptor_klass()) { 589 tag |= JVM_CONSTANT_QDescBit; 590 } 591 save_and_throw_exception(this_cp, which, constantTag(tag), CHECK_NULL); 592 // If CHECK_NULL above doesn't return the exception, that means that 593 // some other thread has beaten us and has resolved the class. 594 // To preserve old behavior, we return the resolved class. 595 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index); 596 assert(klass != NULL, "must be resolved if exception was cleared"); 597 return klass; 598 } 599 600 // logging for class+resolve. 601 if (log_is_enabled(Debug, class, resolve)){ 602 trace_class_resolution(this_cp, k); 603 } 604 605 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index); 606 Atomic::release_store(adr, k); 607 // The interpreter assumes when the tag is stored, the klass is resolved 608 // and the Klass* stored in _resolved_klasses is non-NULL, so we need 609 // hardware store ordering here. 610 jbyte tag = JVM_CONSTANT_Class; 611 if (this_cp->tag_at(which).is_Qdescriptor_klass()) { 612 tag |= JVM_CONSTANT_QDescBit; 613 } 614 // We also need to CAS to not overwrite an error from a racing thread. 615 616 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which), 617 (jbyte)JVM_CONSTANT_UnresolvedClass, 618 tag); 619 620 // We need to recheck exceptions from racing thread and return the same. 621 if (old_tag == JVM_CONSTANT_UnresolvedClassInError) { 622 // Remove klass. 623 this_cp->resolved_klasses()->at_put(resolved_klass_index, NULL); 624 throw_resolution_error(this_cp, which, CHECK_NULL); 625 } 626 627 return k; 628 } 629 630 631 // Does not update ConstantPool* - to avoid any exception throwing. Used 632 // by compiler and exception handling. Also used to avoid classloads for 633 // instanceof operations. Returns NULL if the class has not been loaded or 634 // if the verification of constant pool failed 635 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) { 636 CPKlassSlot kslot = this_cp->klass_slot_at(which); 637 int resolved_klass_index = kslot.resolved_klass_index(); 638 int name_index = kslot.name_index(); 639 assert(this_cp->tag_at(name_index).is_symbol(), "sanity"); 640 641 if (this_cp->tag_at(which).is_klass()) { 642 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index); 643 assert(k != NULL, "should be resolved"); 644 return k; 645 } else if (this_cp->tag_at(which).is_unresolved_klass_in_error()) { 646 return NULL; 647 } else { 648 Thread* current = Thread::current(); 649 Symbol* name = this_cp->symbol_at(name_index); 650 oop loader = this_cp->pool_holder()->class_loader(); 651 oop protection_domain = this_cp->pool_holder()->protection_domain(); 652 Handle h_prot (current, protection_domain); 653 Handle h_loader (current, loader); 654 Klass* k = SystemDictionary::find_instance_klass(current, name, h_loader, h_prot); 655 656 // Avoid constant pool verification at a safepoint, as it takes the Module_lock. 657 if (k != NULL && current->is_Java_thread()) { 658 // Make sure that resolving is legal 659 JavaThread* THREAD = JavaThread::cast(current); // For exception macros. 660 ExceptionMark em(THREAD); 661 // return NULL if verification fails 662 verify_constant_pool_resolve(this_cp, k, THREAD); 663 if (HAS_PENDING_EXCEPTION) { 664 CLEAR_PENDING_EXCEPTION; 665 return NULL; 666 } 667 return k; 668 } else { 669 return k; 670 } 671 } 672 } 673 674 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool, 675 int which) { 676 if (cpool->cache() == NULL) return NULL; // nothing to load yet 677 int cache_index = decode_cpcache_index(which, true); 678 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { 679 // FIXME: should be an assert 680 log_debug(class, resolve)("bad operand %d in:", which); cpool->print(); 681 return NULL; 682 } 683 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 684 return e->method_if_resolved(cpool); 685 } 686 687 688 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 689 if (cpool->cache() == NULL) return false; // nothing to load yet 690 int cache_index = decode_cpcache_index(which, true); 691 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 692 return e->has_appendix(); 693 } 694 695 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 696 if (cpool->cache() == NULL) return NULL; // nothing to load yet 697 int cache_index = decode_cpcache_index(which, true); 698 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 699 return e->appendix_if_resolved(cpool); 700 } 701 702 703 bool ConstantPool::has_local_signature_at_if_loaded(const constantPoolHandle& cpool, int which) { 704 if (cpool->cache() == NULL) return false; // nothing to load yet 705 int cache_index = decode_cpcache_index(which, true); 706 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 707 return e->has_local_signature(); 708 } 709 710 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { 711 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 712 return symbol_at(name_index); 713 } 714 715 716 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { 717 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 718 return symbol_at(signature_index); 719 } 720 721 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { 722 int i = which; 723 if (!uncached && cache() != NULL) { 724 if (ConstantPool::is_invokedynamic_index(which)) { 725 // Invokedynamic index is index into the constant pool cache 726 int pool_index = invokedynamic_bootstrap_ref_index_at(which); 727 pool_index = bootstrap_name_and_type_ref_index_at(pool_index); 728 assert(tag_at(pool_index).is_name_and_type(), ""); 729 return pool_index; 730 } 731 // change byte-ordering and go via cache 732 i = remap_instruction_operand_from_cache(which); 733 } else { 734 if (tag_at(which).has_bootstrap()) { 735 int pool_index = bootstrap_name_and_type_ref_index_at(which); 736 assert(tag_at(pool_index).is_name_and_type(), ""); 737 return pool_index; 738 } 739 } 740 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 741 assert(!tag_at(i).has_bootstrap(), "Must be handled above"); 742 jint ref_index = *int_at_addr(i); 743 return extract_high_short_from_int(ref_index); 744 } 745 746 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) { 747 int pool_index = which; 748 if (!uncached && cache() != NULL) { 749 if (ConstantPool::is_invokedynamic_index(which)) { 750 // Invokedynamic index is index into resolved_references 751 pool_index = invokedynamic_bootstrap_ref_index_at(which); 752 } else { 753 // change byte-ordering and go via cache 754 pool_index = remap_instruction_operand_from_cache(which); 755 } 756 } 757 return tag_at(pool_index); 758 } 759 760 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { 761 guarantee(!ConstantPool::is_invokedynamic_index(which), 762 "an invokedynamic instruction does not have a klass"); 763 int i = which; 764 if (!uncached && cache() != NULL) { 765 // change byte-ordering and go via cache 766 i = remap_instruction_operand_from_cache(which); 767 } 768 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 769 jint ref_index = *int_at_addr(i); 770 return extract_low_short_from_int(ref_index); 771 } 772 773 774 775 int ConstantPool::remap_instruction_operand_from_cache(int operand) { 776 int cpc_index = operand; 777 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); 778 assert((int)(u2)cpc_index == cpc_index, "clean u2"); 779 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); 780 return member_index; 781 } 782 783 784 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) { 785 if (!(k->is_instance_klass() || k->is_objArray_klass())) { 786 return; // short cut, typeArray klass is always accessible 787 } 788 Klass* holder = this_cp->pool_holder(); 789 LinkResolver::check_klass_accessibility(holder, k, CHECK); 790 } 791 792 793 int ConstantPool::name_ref_index_at(int which_nt) { 794 jint ref_index = name_and_type_at(which_nt); 795 return extract_low_short_from_int(ref_index); 796 } 797 798 799 int ConstantPool::signature_ref_index_at(int which_nt) { 800 jint ref_index = name_and_type_at(which_nt); 801 return extract_high_short_from_int(ref_index); 802 } 803 804 805 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { 806 return klass_at(klass_ref_index_at(which), THREAD); 807 } 808 809 Symbol* ConstantPool::klass_name_at(int which) const { 810 return symbol_at(klass_slot_at(which).name_index()); 811 } 812 813 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { 814 jint ref_index = klass_ref_index_at(which); 815 return klass_at_noresolve(ref_index); 816 } 817 818 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { 819 jint ref_index = uncached_klass_ref_index_at(which); 820 return klass_at_noresolve(ref_index); 821 } 822 823 char* ConstantPool::string_at_noresolve(int which) { 824 return unresolved_string_at(which)->as_C_string(); 825 } 826 827 BasicType ConstantPool::basic_type_for_signature_at(int which) const { 828 return Signature::basic_type(symbol_at(which)); 829 } 830 831 832 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) { 833 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused 834 if (this_cp->tag_at(index).is_string()) { 835 this_cp->string_at(index, CHECK); 836 } 837 } 838 } 839 840 static Symbol* exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) { 841 // Dig out the detailed message to reuse if possible 842 Symbol* message = java_lang_Throwable::detail_message(pending_exception); 843 if (message != NULL) { 844 return message; 845 } 846 847 // Return specific message for the tag 848 switch (tag.value()) { 849 case JVM_CONSTANT_UnresolvedClass: 850 // return the class name in the error message 851 message = this_cp->klass_name_at(which); 852 break; 853 case JVM_CONSTANT_MethodHandle: 854 // return the method handle name in the error message 855 message = this_cp->method_handle_name_ref_at(which); 856 break; 857 case JVM_CONSTANT_MethodType: 858 // return the method type signature in the error message 859 message = this_cp->method_type_signature_at(which); 860 break; 861 case JVM_CONSTANT_Dynamic: 862 // return the name of the condy in the error message 863 message = this_cp->uncached_name_ref_at(which); 864 break; 865 default: 866 ShouldNotReachHere(); 867 } 868 869 return message; 870 } 871 872 static void add_resolution_error(const constantPoolHandle& this_cp, int which, 873 constantTag tag, oop pending_exception) { 874 875 Symbol* error = pending_exception->klass()->name(); 876 oop cause = java_lang_Throwable::cause(pending_exception); 877 878 // Also dig out the exception cause, if present. 879 Symbol* cause_sym = NULL; 880 Symbol* cause_msg = NULL; 881 if (cause != NULL && cause != pending_exception) { 882 cause_sym = cause->klass()->name(); 883 cause_msg = java_lang_Throwable::detail_message(cause); 884 } 885 886 Symbol* message = exception_message(this_cp, which, tag, pending_exception); 887 SystemDictionary::add_resolution_error(this_cp, which, error, message, cause_sym, cause_msg); 888 } 889 890 891 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) { 892 ResourceMark rm(THREAD); 893 Symbol* message = NULL; 894 Symbol* cause = NULL; 895 Symbol* cause_msg = NULL; 896 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message, &cause, &cause_msg); 897 assert(error != NULL, "checking"); 898 const char* cause_str = cause_msg != NULL ? cause_msg->as_C_string() : NULL; 899 900 CLEAR_PENDING_EXCEPTION; 901 if (message != NULL) { 902 char* msg = message->as_C_string(); 903 if (cause != NULL) { 904 Handle h_cause = Exceptions::new_exception(THREAD, cause, cause_str); 905 THROW_MSG_CAUSE(error, msg, h_cause); 906 } else { 907 THROW_MSG(error, msg); 908 } 909 } else { 910 if (cause != NULL) { 911 Handle h_cause = Exceptions::new_exception(THREAD, cause, cause_str); 912 THROW_CAUSE(error, h_cause); 913 } else { 914 THROW(error); 915 } 916 } 917 } 918 919 // If resolution for Class, Dynamic constant, MethodHandle or MethodType fails, save the 920 // exception in the resolution error table, so that the same exception is thrown again. 921 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which, 922 constantTag tag, TRAPS) { 923 924 int error_tag = tag.error_value(); 925 926 if (!PENDING_EXCEPTION-> 927 is_a(vmClasses::LinkageError_klass())) { 928 // Just throw the exception and don't prevent these classes from 929 // being loaded due to virtual machine errors like StackOverflow 930 // and OutOfMemoryError, etc, or if the thread was hit by stop() 931 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 932 } else if (this_cp->tag_at(which).value() != error_tag) { 933 add_resolution_error(this_cp, which, tag, PENDING_EXCEPTION); 934 // CAS in the tag. If a thread beat us to registering this error that's fine. 935 // If another thread resolved the reference, this is a race condition. This 936 // thread may have had a security manager or something temporary. 937 // This doesn't deterministically get an error. So why do we save this? 938 // We save this because jvmti can add classes to the bootclass path after 939 // this error, so it needs to get the same error if the error is first. 940 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which), 941 (jbyte)tag.value(), 942 (jbyte)error_tag); 943 if (old_tag != error_tag && old_tag != tag.value()) { 944 // MethodHandles and MethodType doesn't change to resolved version. 945 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value"); 946 // Forget the exception and use the resolved class. 947 CLEAR_PENDING_EXCEPTION; 948 } 949 } else { 950 // some other thread put this in error state 951 throw_resolution_error(this_cp, which, CHECK); 952 } 953 } 954 955 constantTag ConstantPool::constant_tag_at(int which) { 956 constantTag tag = tag_at(which); 957 if (tag.is_dynamic_constant()) { 958 BasicType bt = basic_type_for_constant_at(which); 959 return constantTag(constantTag::type2tag(bt)); 960 } 961 return tag; 962 } 963 964 BasicType ConstantPool::basic_type_for_constant_at(int which) { 965 constantTag tag = tag_at(which); 966 if (tag.is_dynamic_constant() || 967 tag.is_dynamic_constant_in_error()) { 968 // have to look at the signature for this one 969 Symbol* constant_type = uncached_signature_ref_at(which); 970 return Signature::basic_type(constant_type); 971 } 972 return tag.basic_type(); 973 } 974 975 // Called to resolve constants in the constant pool and return an oop. 976 // Some constant pool entries cache their resolved oop. This is also 977 // called to create oops from constants to use in arguments for invokedynamic 978 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, 979 int index, int cache_index, 980 bool* status_return, TRAPS) { 981 oop result_oop = NULL; 982 Handle throw_exception; 983 984 if (cache_index == _possible_index_sentinel) { 985 // It is possible that this constant is one which is cached in the objects. 986 // We'll do a linear search. This should be OK because this usage is rare. 987 // FIXME: If bootstrap specifiers stress this code, consider putting in 988 // a reverse index. Binary search over a short array should do it. 989 assert(index > 0, "valid index"); 990 cache_index = this_cp->cp_to_object_index(index); 991 } 992 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); 993 assert(index == _no_index_sentinel || index >= 0, ""); 994 995 if (cache_index >= 0) { 996 result_oop = this_cp->resolved_reference_at(cache_index); 997 if (result_oop != NULL) { 998 if (result_oop == Universe::the_null_sentinel()) { 999 DEBUG_ONLY(int temp_index = (index >= 0 ? index : this_cp->object_to_cp_index(cache_index))); 1000 assert(this_cp->tag_at(temp_index).is_dynamic_constant(), "only condy uses the null sentinel"); 1001 result_oop = NULL; 1002 } 1003 if (status_return != NULL) (*status_return) = true; 1004 return result_oop; 1005 // That was easy... 1006 } 1007 index = this_cp->object_to_cp_index(cache_index); 1008 } 1009 1010 jvalue prim_value; // temp used only in a few cases below 1011 1012 constantTag tag = this_cp->tag_at(index); 1013 1014 if (status_return != NULL) { 1015 // don't trigger resolution if the constant might need it 1016 switch (tag.value()) { 1017 case JVM_CONSTANT_Class: 1018 { 1019 CPKlassSlot kslot = this_cp->klass_slot_at(index); 1020 int resolved_klass_index = kslot.resolved_klass_index(); 1021 if (this_cp->resolved_klasses()->at(resolved_klass_index) == NULL) { 1022 (*status_return) = false; 1023 return NULL; 1024 } 1025 // the klass is waiting in the CP; go get it 1026 break; 1027 } 1028 case JVM_CONSTANT_String: 1029 case JVM_CONSTANT_Integer: 1030 case JVM_CONSTANT_Float: 1031 case JVM_CONSTANT_Long: 1032 case JVM_CONSTANT_Double: 1033 // these guys trigger OOM at worst 1034 break; 1035 default: 1036 (*status_return) = false; 1037 return NULL; 1038 } 1039 // from now on there is either success or an OOME 1040 (*status_return) = true; 1041 } 1042 1043 switch (tag.value()) { 1044 1045 case JVM_CONSTANT_UnresolvedClass: 1046 case JVM_CONSTANT_Class: 1047 { 1048 assert(cache_index == _no_index_sentinel, "should not have been set"); 1049 Klass* resolved = klass_at_impl(this_cp, index, CHECK_NULL); 1050 // ldc wants the java mirror. 1051 result_oop = tag.is_Qdescriptor_klass() 1052 ? InlineKlass::cast(resolved)->val_mirror() 1053 : resolved->java_mirror(); 1054 break; 1055 } 1056 1057 case JVM_CONSTANT_Dynamic: 1058 { 1059 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop. 1060 BootstrapInfo bootstrap_specifier(this_cp, index); 1061 1062 // The initial step in resolving an unresolved symbolic reference to a 1063 // dynamically-computed constant is to resolve the symbolic reference to a 1064 // method handle which will be the bootstrap method for the dynamically-computed 1065 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap 1066 // method fails, then a MethodHandleInError is stored at the corresponding 1067 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to 1068 // set a DynamicConstantInError here since any subsequent use of this 1069 // bootstrap method will encounter the resolution of MethodHandleInError. 1070 // Both the first, (resolution of the BSM and its static arguments), and the second tasks, 1071 // (invocation of the BSM), of JVMS Section 5.4.3.6 occur within invoke_bootstrap_method() 1072 // for the bootstrap_specifier created above. 1073 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD); 1074 Exceptions::wrap_dynamic_exception(/* is_indy */ false, THREAD); 1075 if (HAS_PENDING_EXCEPTION) { 1076 // Resolution failure of the dynamically-computed constant, save_and_throw_exception 1077 // will check for a LinkageError and store a DynamicConstantInError. 1078 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 1079 } 1080 result_oop = bootstrap_specifier.resolved_value()(); 1081 BasicType type = Signature::basic_type(bootstrap_specifier.signature()); 1082 if (!is_reference_type(type)) { 1083 // Make sure the primitive value is properly boxed. 1084 // This is a JDK responsibility. 1085 const char* fail = NULL; 1086 if (result_oop == NULL) { 1087 fail = "null result instead of box"; 1088 } else if (!is_java_primitive(type)) { 1089 // FIXME: support value types via unboxing 1090 fail = "can only handle references and primitives"; 1091 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) { 1092 fail = "primitive is not properly boxed"; 1093 } 1094 if (fail != NULL) { 1095 // Since this exception is not a LinkageError, throw exception 1096 // but do not save a DynamicInError resolution result. 1097 // See section 5.4.3 of the VM spec. 1098 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail); 1099 } 1100 } 1101 1102 LogTarget(Debug, methodhandles, condy) lt_condy; 1103 if (lt_condy.is_enabled()) { 1104 LogStream ls(lt_condy); 1105 bootstrap_specifier.print_msg_on(&ls, "resolve_constant_at_impl"); 1106 } 1107 break; 1108 } 1109 1110 case JVM_CONSTANT_String: 1111 assert(cache_index != _no_index_sentinel, "should have been set"); 1112 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL); 1113 break; 1114 1115 case JVM_CONSTANT_MethodHandle: 1116 { 1117 int ref_kind = this_cp->method_handle_ref_kind_at(index); 1118 int callee_index = this_cp->method_handle_klass_index_at(index); 1119 Symbol* name = this_cp->method_handle_name_ref_at(index); 1120 Symbol* signature = this_cp->method_handle_signature_ref_at(index); 1121 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index)); 1122 { ResourceMark rm(THREAD); 1123 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", 1124 ref_kind, index, this_cp->method_handle_index_at(index), 1125 callee_index, name->as_C_string(), signature->as_C_string()); 1126 } 1127 1128 Klass* callee = klass_at_impl(this_cp, callee_index, THREAD); 1129 if (HAS_PENDING_EXCEPTION) { 1130 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 1131 } 1132 1133 // Check constant pool method consistency 1134 if ((callee->is_interface() && m_tag.is_method()) || 1135 (!callee->is_interface() && m_tag.is_interface_method())) { 1136 ResourceMark rm(THREAD); 1137 stringStream ss; 1138 ss.print("Inconsistent constant pool data in classfile for class %s. " 1139 "Method '", callee->name()->as_C_string()); 1140 signature->print_as_signature_external_return_type(&ss); 1141 ss.print(" %s(", name->as_C_string()); 1142 signature->print_as_signature_external_parameters(&ss); 1143 ss.print(")' at index %d is %s and should be %s", 1144 index, 1145 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef", 1146 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef"); 1147 Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_IncompatibleClassChangeError(), "%s", ss.as_string()); 1148 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 1149 } 1150 1151 Klass* klass = this_cp->pool_holder(); 1152 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, 1153 callee, name, signature, 1154 THREAD); 1155 if (HAS_PENDING_EXCEPTION) { 1156 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 1157 } 1158 result_oop = value(); 1159 break; 1160 } 1161 1162 case JVM_CONSTANT_MethodType: 1163 { 1164 Symbol* signature = this_cp->method_type_signature_at(index); 1165 { ResourceMark rm(THREAD); 1166 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s", 1167 index, this_cp->method_type_index_at(index), 1168 signature->as_C_string()); 1169 } 1170 Klass* klass = this_cp->pool_holder(); 1171 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); 1172 result_oop = value(); 1173 if (HAS_PENDING_EXCEPTION) { 1174 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 1175 } 1176 break; 1177 } 1178 1179 case JVM_CONSTANT_Integer: 1180 assert(cache_index == _no_index_sentinel, "should not have been set"); 1181 prim_value.i = this_cp->int_at(index); 1182 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); 1183 break; 1184 1185 case JVM_CONSTANT_Float: 1186 assert(cache_index == _no_index_sentinel, "should not have been set"); 1187 prim_value.f = this_cp->float_at(index); 1188 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); 1189 break; 1190 1191 case JVM_CONSTANT_Long: 1192 assert(cache_index == _no_index_sentinel, "should not have been set"); 1193 prim_value.j = this_cp->long_at(index); 1194 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); 1195 break; 1196 1197 case JVM_CONSTANT_Double: 1198 assert(cache_index == _no_index_sentinel, "should not have been set"); 1199 prim_value.d = this_cp->double_at(index); 1200 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); 1201 break; 1202 1203 case JVM_CONSTANT_UnresolvedClassInError: 1204 case JVM_CONSTANT_DynamicInError: 1205 case JVM_CONSTANT_MethodHandleInError: 1206 case JVM_CONSTANT_MethodTypeInError: 1207 throw_resolution_error(this_cp, index, CHECK_NULL); 1208 break; 1209 1210 default: 1211 fatal("unexpected constant tag at CP %p[%d/%d] = %d", this_cp(), index, cache_index, tag.value()); 1212 break; 1213 } 1214 1215 if (cache_index >= 0) { 1216 // Benign race condition: resolved_references may already be filled in. 1217 // The important thing here is that all threads pick up the same result. 1218 // It doesn't matter which racing thread wins, as long as only one 1219 // result is used by all threads, and all future queries. 1220 oop new_result = (result_oop == NULL ? Universe::the_null_sentinel() : result_oop); 1221 oop old_result = this_cp->set_resolved_reference_at(cache_index, new_result); 1222 if (old_result == nullptr) { 1223 return result_oop; // was installed 1224 } else { 1225 // Return the winning thread's result. This can be different than 1226 // the result here for MethodHandles. 1227 if (old_result == Universe::the_null_sentinel()) 1228 old_result = NULL; 1229 return old_result; 1230 } 1231 } else { 1232 assert(result_oop != Universe::the_null_sentinel(), ""); 1233 return result_oop; 1234 } 1235 } 1236 1237 oop ConstantPool::uncached_string_at(int which, TRAPS) { 1238 Symbol* sym = unresolved_string_at(which); 1239 oop str = StringTable::intern(sym, CHECK_(NULL)); 1240 assert(java_lang_String::is_instance(str), "must be string"); 1241 return str; 1242 } 1243 1244 void ConstantPool::copy_bootstrap_arguments_at_impl(const constantPoolHandle& this_cp, int index, 1245 int start_arg, int end_arg, 1246 objArrayHandle info, int pos, 1247 bool must_resolve, Handle if_not_available, 1248 TRAPS) { 1249 int limit = pos + end_arg - start_arg; 1250 // checks: index in range [0..this_cp->length), 1251 // tag at index, start..end in range [0..this_cp->bootstrap_argument_count], 1252 // info array non-null, pos..limit in [0..info.length] 1253 if ((0 >= index || index >= this_cp->length()) || 1254 !(this_cp->tag_at(index).is_invoke_dynamic() || 1255 this_cp->tag_at(index).is_dynamic_constant()) || 1256 (0 > start_arg || start_arg > end_arg) || 1257 (end_arg > this_cp->bootstrap_argument_count_at(index)) || 1258 (0 > pos || pos > limit) || 1259 (info.is_null() || limit > info->length())) { 1260 // An index or something else went wrong; throw an error. 1261 // Since this is an internal API, we don't expect this, 1262 // so we don't bother to craft a nice message. 1263 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access"); 1264 } 1265 // now we can loop safely 1266 int info_i = pos; 1267 for (int i = start_arg; i < end_arg; i++) { 1268 int arg_index = this_cp->bootstrap_argument_index_at(index, i); 1269 oop arg_oop; 1270 if (must_resolve) { 1271 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK); 1272 } else { 1273 bool found_it = false; 1274 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK); 1275 if (!found_it) arg_oop = if_not_available(); 1276 } 1277 info->obj_at_put(info_i++, arg_oop); 1278 } 1279 } 1280 1281 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) { 1282 // If the string has already been interned, this entry will be non-null 1283 oop str = this_cp->resolved_reference_at(obj_index); 1284 assert(str != Universe::the_null_sentinel(), ""); 1285 if (str != NULL) return str; 1286 Symbol* sym = this_cp->unresolved_string_at(which); 1287 str = StringTable::intern(sym, CHECK_(NULL)); 1288 this_cp->string_at_put(which, obj_index, str); 1289 assert(java_lang_String::is_instance(str), "must be string"); 1290 return str; 1291 } 1292 1293 1294 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) { 1295 // Names are interned, so we can compare Symbol*s directly 1296 Symbol* cp_name = klass_name_at(which); 1297 return (cp_name == k->name()); 1298 } 1299 1300 1301 // Iterate over symbols and decrement ones which are Symbol*s 1302 // This is done during GC. 1303 // Only decrement the UTF8 symbols. Strings point to 1304 // these symbols but didn't increment the reference count. 1305 void ConstantPool::unreference_symbols() { 1306 for (int index = 1; index < length(); index++) { // Index 0 is unused 1307 constantTag tag = tag_at(index); 1308 if (tag.is_symbol()) { 1309 symbol_at(index)->decrement_refcount(); 1310 } 1311 } 1312 } 1313 1314 1315 // Compare this constant pool's entry at index1 to the constant pool 1316 // cp2's entry at index2. 1317 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2, 1318 int index2) { 1319 1320 // The error tags are equivalent to non-error tags when comparing 1321 jbyte t1 = tag_at(index1).non_error_value(); 1322 jbyte t2 = cp2->tag_at(index2).non_error_value(); 1323 1324 if (t1 != t2) { 1325 // Not the same entry type so there is nothing else to check. Note 1326 // that this style of checking will consider resolved/unresolved 1327 // class pairs as different. 1328 // From the ConstantPool* API point of view, this is correct 1329 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this 1330 // plays out in the context of ConstantPool* merging. 1331 return false; 1332 } 1333 1334 switch (t1) { 1335 case JVM_CONSTANT_Class: 1336 { 1337 Klass* k1 = resolved_klass_at(index1); 1338 Klass* k2 = cp2->resolved_klass_at(index2); 1339 if (k1 == k2) { 1340 return true; 1341 } 1342 } break; 1343 1344 case JVM_CONSTANT_ClassIndex: 1345 { 1346 int recur1 = klass_index_at(index1); 1347 int recur2 = cp2->klass_index_at(index2); 1348 if (compare_entry_to(recur1, cp2, recur2)) { 1349 return true; 1350 } 1351 } break; 1352 1353 case JVM_CONSTANT_Double: 1354 { 1355 jdouble d1 = double_at(index1); 1356 jdouble d2 = cp2->double_at(index2); 1357 if (d1 == d2) { 1358 return true; 1359 } 1360 } break; 1361 1362 case JVM_CONSTANT_Fieldref: 1363 case JVM_CONSTANT_InterfaceMethodref: 1364 case JVM_CONSTANT_Methodref: 1365 { 1366 int recur1 = uncached_klass_ref_index_at(index1); 1367 int recur2 = cp2->uncached_klass_ref_index_at(index2); 1368 bool match = compare_entry_to(recur1, cp2, recur2); 1369 if (match) { 1370 recur1 = uncached_name_and_type_ref_index_at(index1); 1371 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); 1372 if (compare_entry_to(recur1, cp2, recur2)) { 1373 return true; 1374 } 1375 } 1376 } break; 1377 1378 case JVM_CONSTANT_Float: 1379 { 1380 jfloat f1 = float_at(index1); 1381 jfloat f2 = cp2->float_at(index2); 1382 if (f1 == f2) { 1383 return true; 1384 } 1385 } break; 1386 1387 case JVM_CONSTANT_Integer: 1388 { 1389 jint i1 = int_at(index1); 1390 jint i2 = cp2->int_at(index2); 1391 if (i1 == i2) { 1392 return true; 1393 } 1394 } break; 1395 1396 case JVM_CONSTANT_Long: 1397 { 1398 jlong l1 = long_at(index1); 1399 jlong l2 = cp2->long_at(index2); 1400 if (l1 == l2) { 1401 return true; 1402 } 1403 } break; 1404 1405 case JVM_CONSTANT_NameAndType: 1406 { 1407 int recur1 = name_ref_index_at(index1); 1408 int recur2 = cp2->name_ref_index_at(index2); 1409 if (compare_entry_to(recur1, cp2, recur2)) { 1410 recur1 = signature_ref_index_at(index1); 1411 recur2 = cp2->signature_ref_index_at(index2); 1412 if (compare_entry_to(recur1, cp2, recur2)) { 1413 return true; 1414 } 1415 } 1416 } break; 1417 1418 case JVM_CONSTANT_StringIndex: 1419 { 1420 int recur1 = string_index_at(index1); 1421 int recur2 = cp2->string_index_at(index2); 1422 if (compare_entry_to(recur1, cp2, recur2)) { 1423 return true; 1424 } 1425 } break; 1426 1427 case JVM_CONSTANT_UnresolvedClass: 1428 { 1429 Symbol* k1 = klass_name_at(index1); 1430 Symbol* k2 = cp2->klass_name_at(index2); 1431 if (k1 == k2) { 1432 return true; 1433 } 1434 } break; 1435 1436 case JVM_CONSTANT_MethodType: 1437 { 1438 int k1 = method_type_index_at(index1); 1439 int k2 = cp2->method_type_index_at(index2); 1440 if (compare_entry_to(k1, cp2, k2)) { 1441 return true; 1442 } 1443 } break; 1444 1445 case JVM_CONSTANT_MethodHandle: 1446 { 1447 int k1 = method_handle_ref_kind_at(index1); 1448 int k2 = cp2->method_handle_ref_kind_at(index2); 1449 if (k1 == k2) { 1450 int i1 = method_handle_index_at(index1); 1451 int i2 = cp2->method_handle_index_at(index2); 1452 if (compare_entry_to(i1, cp2, i2)) { 1453 return true; 1454 } 1455 } 1456 } break; 1457 1458 case JVM_CONSTANT_Dynamic: 1459 { 1460 int k1 = bootstrap_name_and_type_ref_index_at(index1); 1461 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2); 1462 int i1 = bootstrap_methods_attribute_index(index1); 1463 int i2 = cp2->bootstrap_methods_attribute_index(index2); 1464 bool match_entry = compare_entry_to(k1, cp2, k2); 1465 bool match_operand = compare_operand_to(i1, cp2, i2); 1466 return (match_entry && match_operand); 1467 } break; 1468 1469 case JVM_CONSTANT_InvokeDynamic: 1470 { 1471 int k1 = bootstrap_name_and_type_ref_index_at(index1); 1472 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2); 1473 int i1 = bootstrap_methods_attribute_index(index1); 1474 int i2 = cp2->bootstrap_methods_attribute_index(index2); 1475 bool match_entry = compare_entry_to(k1, cp2, k2); 1476 bool match_operand = compare_operand_to(i1, cp2, i2); 1477 return (match_entry && match_operand); 1478 } break; 1479 1480 case JVM_CONSTANT_String: 1481 { 1482 Symbol* s1 = unresolved_string_at(index1); 1483 Symbol* s2 = cp2->unresolved_string_at(index2); 1484 if (s1 == s2) { 1485 return true; 1486 } 1487 } break; 1488 1489 case JVM_CONSTANT_Utf8: 1490 { 1491 Symbol* s1 = symbol_at(index1); 1492 Symbol* s2 = cp2->symbol_at(index2); 1493 if (s1 == s2) { 1494 return true; 1495 } 1496 } break; 1497 1498 // Invalid is used as the tag for the second constant pool entry 1499 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1500 // not be seen by itself. 1501 case JVM_CONSTANT_Invalid: // fall through 1502 1503 default: 1504 ShouldNotReachHere(); 1505 break; 1506 } 1507 1508 return false; 1509 } // end compare_entry_to() 1510 1511 1512 // Resize the operands array with delta_len and delta_size. 1513 // Used in RedefineClasses for CP merge. 1514 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { 1515 int old_len = operand_array_length(operands()); 1516 int new_len = old_len + delta_len; 1517 int min_len = (delta_len > 0) ? old_len : new_len; 1518 1519 int old_size = operands()->length(); 1520 int new_size = old_size + delta_size; 1521 int min_size = (delta_size > 0) ? old_size : new_size; 1522 1523 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1524 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); 1525 1526 // Set index in the resized array for existing elements only 1527 for (int idx = 0; idx < min_len; idx++) { 1528 int offset = operand_offset_at(idx); // offset in original array 1529 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array 1530 } 1531 // Copy the bootstrap specifiers only 1532 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), 1533 new_ops->adr_at(2*new_len), 1534 (min_size - 2*min_len) * sizeof(u2)); 1535 // Explicitly deallocate old operands array. 1536 // Note, it is not needed for 7u backport. 1537 if ( operands() != NULL) { // the safety check 1538 MetadataFactory::free_array<u2>(loader_data, operands()); 1539 } 1540 set_operands(new_ops); 1541 } // end resize_operands() 1542 1543 1544 // Extend the operands array with the length and size of the ext_cp operands. 1545 // Used in RedefineClasses for CP merge. 1546 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) { 1547 int delta_len = operand_array_length(ext_cp->operands()); 1548 if (delta_len == 0) { 1549 return; // nothing to do 1550 } 1551 int delta_size = ext_cp->operands()->length(); 1552 1553 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); 1554 1555 if (operand_array_length(operands()) == 0) { 1556 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1557 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); 1558 // The first element index defines the offset of second part 1559 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array 1560 set_operands(new_ops); 1561 } else { 1562 resize_operands(delta_len, delta_size, CHECK); 1563 } 1564 1565 } // end extend_operands() 1566 1567 1568 // Shrink the operands array to a smaller array with new_len length. 1569 // Used in RedefineClasses for CP merge. 1570 void ConstantPool::shrink_operands(int new_len, TRAPS) { 1571 int old_len = operand_array_length(operands()); 1572 if (new_len == old_len) { 1573 return; // nothing to do 1574 } 1575 assert(new_len < old_len, "shrunken operands array must be smaller"); 1576 1577 int free_base = operand_next_offset_at(new_len - 1); 1578 int delta_len = new_len - old_len; 1579 int delta_size = 2*delta_len + free_base - operands()->length(); 1580 1581 resize_operands(delta_len, delta_size, CHECK); 1582 1583 } // end shrink_operands() 1584 1585 1586 void ConstantPool::copy_operands(const constantPoolHandle& from_cp, 1587 const constantPoolHandle& to_cp, 1588 TRAPS) { 1589 1590 int from_oplen = operand_array_length(from_cp->operands()); 1591 int old_oplen = operand_array_length(to_cp->operands()); 1592 if (from_oplen != 0) { 1593 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); 1594 // append my operands to the target's operands array 1595 if (old_oplen == 0) { 1596 // Can't just reuse from_cp's operand list because of deallocation issues 1597 int len = from_cp->operands()->length(); 1598 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); 1599 Copy::conjoint_memory_atomic( 1600 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); 1601 to_cp->set_operands(new_ops); 1602 } else { 1603 int old_len = to_cp->operands()->length(); 1604 int from_len = from_cp->operands()->length(); 1605 int old_off = old_oplen * sizeof(u2); 1606 int from_off = from_oplen * sizeof(u2); 1607 // Use the metaspace for the destination constant pool 1608 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); 1609 int fillp = 0, len = 0; 1610 // first part of dest 1611 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), 1612 new_operands->adr_at(fillp), 1613 (len = old_off) * sizeof(u2)); 1614 fillp += len; 1615 // first part of src 1616 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), 1617 new_operands->adr_at(fillp), 1618 (len = from_off) * sizeof(u2)); 1619 fillp += len; 1620 // second part of dest 1621 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), 1622 new_operands->adr_at(fillp), 1623 (len = old_len - old_off) * sizeof(u2)); 1624 fillp += len; 1625 // second part of src 1626 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), 1627 new_operands->adr_at(fillp), 1628 (len = from_len - from_off) * sizeof(u2)); 1629 fillp += len; 1630 assert(fillp == new_operands->length(), ""); 1631 1632 // Adjust indexes in the first part of the copied operands array. 1633 for (int j = 0; j < from_oplen; j++) { 1634 int offset = operand_offset_at(new_operands, old_oplen + j); 1635 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); 1636 offset += old_len; // every new tuple is preceded by old_len extra u2's 1637 operand_offset_at_put(new_operands, old_oplen + j, offset); 1638 } 1639 1640 // replace target operands array with combined array 1641 to_cp->set_operands(new_operands); 1642 } 1643 } 1644 } // end copy_operands() 1645 1646 1647 // Copy this constant pool's entries at start_i to end_i (inclusive) 1648 // to the constant pool to_cp's entries starting at to_i. A total of 1649 // (end_i - start_i) + 1 entries are copied. 1650 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i, 1651 const constantPoolHandle& to_cp, int to_i, TRAPS) { 1652 1653 1654 int dest_i = to_i; // leave original alone for debug purposes 1655 1656 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { 1657 copy_entry_to(from_cp, src_i, to_cp, dest_i); 1658 1659 switch (from_cp->tag_at(src_i).value()) { 1660 case JVM_CONSTANT_Double: 1661 case JVM_CONSTANT_Long: 1662 // double and long take two constant pool entries 1663 src_i += 2; 1664 dest_i += 2; 1665 break; 1666 1667 default: 1668 // all others take one constant pool entry 1669 src_i++; 1670 dest_i++; 1671 break; 1672 } 1673 } 1674 copy_operands(from_cp, to_cp, CHECK); 1675 1676 } // end copy_cp_to_impl() 1677 1678 1679 // Copy this constant pool's entry at from_i to the constant pool 1680 // to_cp's entry at to_i. 1681 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i, 1682 const constantPoolHandle& to_cp, int to_i) { 1683 1684 int tag = from_cp->tag_at(from_i).value(); 1685 switch (tag) { 1686 case JVM_CONSTANT_ClassIndex: 1687 { 1688 jint ki = from_cp->klass_index_at(from_i); 1689 to_cp->klass_index_at_put(to_i, ki); 1690 } break; 1691 1692 case JVM_CONSTANT_Double: 1693 { 1694 jdouble d = from_cp->double_at(from_i); 1695 to_cp->double_at_put(to_i, d); 1696 // double takes two constant pool entries so init second entry's tag 1697 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1698 } break; 1699 1700 case JVM_CONSTANT_Fieldref: 1701 { 1702 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1703 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1704 to_cp->field_at_put(to_i, class_index, name_and_type_index); 1705 } break; 1706 1707 case JVM_CONSTANT_Float: 1708 { 1709 jfloat f = from_cp->float_at(from_i); 1710 to_cp->float_at_put(to_i, f); 1711 } break; 1712 1713 case JVM_CONSTANT_Integer: 1714 { 1715 jint i = from_cp->int_at(from_i); 1716 to_cp->int_at_put(to_i, i); 1717 } break; 1718 1719 case JVM_CONSTANT_InterfaceMethodref: 1720 { 1721 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1722 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1723 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); 1724 } break; 1725 1726 case JVM_CONSTANT_Long: 1727 { 1728 jlong l = from_cp->long_at(from_i); 1729 to_cp->long_at_put(to_i, l); 1730 // long takes two constant pool entries so init second entry's tag 1731 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1732 } break; 1733 1734 case JVM_CONSTANT_Methodref: 1735 { 1736 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1737 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1738 to_cp->method_at_put(to_i, class_index, name_and_type_index); 1739 } break; 1740 1741 case JVM_CONSTANT_NameAndType: 1742 { 1743 int name_ref_index = from_cp->name_ref_index_at(from_i); 1744 int signature_ref_index = from_cp->signature_ref_index_at(from_i); 1745 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); 1746 } break; 1747 1748 case JVM_CONSTANT_StringIndex: 1749 { 1750 jint si = from_cp->string_index_at(from_i); 1751 to_cp->string_index_at_put(to_i, si); 1752 } break; 1753 1754 case JVM_CONSTANT_Class: 1755 case JVM_CONSTANT_UnresolvedClass: 1756 case JVM_CONSTANT_UnresolvedClassInError: 1757 { 1758 // Revert to JVM_CONSTANT_ClassIndex 1759 int name_index = from_cp->klass_slot_at(from_i).name_index(); 1760 assert(from_cp->tag_at(name_index).is_symbol(), "sanity"); 1761 to_cp->klass_index_at_put(to_i, name_index); 1762 } break; 1763 1764 case JVM_CONSTANT_String: 1765 { 1766 Symbol* s = from_cp->unresolved_string_at(from_i); 1767 to_cp->unresolved_string_at_put(to_i, s); 1768 } break; 1769 1770 case JVM_CONSTANT_Utf8: 1771 { 1772 Symbol* s = from_cp->symbol_at(from_i); 1773 // Need to increase refcount, the old one will be thrown away and deferenced 1774 s->increment_refcount(); 1775 to_cp->symbol_at_put(to_i, s); 1776 } break; 1777 1778 case JVM_CONSTANT_MethodType: 1779 case JVM_CONSTANT_MethodTypeInError: 1780 { 1781 jint k = from_cp->method_type_index_at(from_i); 1782 to_cp->method_type_index_at_put(to_i, k); 1783 } break; 1784 1785 case JVM_CONSTANT_MethodHandle: 1786 case JVM_CONSTANT_MethodHandleInError: 1787 { 1788 int k1 = from_cp->method_handle_ref_kind_at(from_i); 1789 int k2 = from_cp->method_handle_index_at(from_i); 1790 to_cp->method_handle_index_at_put(to_i, k1, k2); 1791 } break; 1792 1793 case JVM_CONSTANT_Dynamic: 1794 case JVM_CONSTANT_DynamicInError: 1795 { 1796 int k1 = from_cp->bootstrap_methods_attribute_index(from_i); 1797 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i); 1798 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1799 to_cp->dynamic_constant_at_put(to_i, k1, k2); 1800 } break; 1801 1802 case JVM_CONSTANT_InvokeDynamic: 1803 { 1804 int k1 = from_cp->bootstrap_methods_attribute_index(from_i); 1805 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i); 1806 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1807 to_cp->invoke_dynamic_at_put(to_i, k1, k2); 1808 } break; 1809 1810 // Invalid is used as the tag for the second constant pool entry 1811 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1812 // not be seen by itself. 1813 case JVM_CONSTANT_Invalid: // fall through 1814 1815 default: 1816 { 1817 ShouldNotReachHere(); 1818 } break; 1819 } 1820 } // end copy_entry_to() 1821 1822 // Search constant pool search_cp for an entry that matches this 1823 // constant pool's entry at pattern_i. Returns the index of a 1824 // matching entry or zero (0) if there is no matching entry. 1825 int ConstantPool::find_matching_entry(int pattern_i, 1826 const constantPoolHandle& search_cp) { 1827 1828 // index zero (0) is not used 1829 for (int i = 1; i < search_cp->length(); i++) { 1830 bool found = compare_entry_to(pattern_i, search_cp, i); 1831 if (found) { 1832 return i; 1833 } 1834 } 1835 1836 return 0; // entry not found; return unused index zero (0) 1837 } // end find_matching_entry() 1838 1839 1840 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool 1841 // cp2's bootstrap specifier at idx2. 1842 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2) { 1843 int k1 = operand_bootstrap_method_ref_index_at(idx1); 1844 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); 1845 bool match = compare_entry_to(k1, cp2, k2); 1846 1847 if (!match) { 1848 return false; 1849 } 1850 int argc = operand_argument_count_at(idx1); 1851 if (argc == cp2->operand_argument_count_at(idx2)) { 1852 for (int j = 0; j < argc; j++) { 1853 k1 = operand_argument_index_at(idx1, j); 1854 k2 = cp2->operand_argument_index_at(idx2, j); 1855 match = compare_entry_to(k1, cp2, k2); 1856 if (!match) { 1857 return false; 1858 } 1859 } 1860 return true; // got through loop; all elements equal 1861 } 1862 return false; 1863 } // end compare_operand_to() 1864 1865 // Search constant pool search_cp for a bootstrap specifier that matches 1866 // this constant pool's bootstrap specifier data at pattern_i index. 1867 // Return the index of a matching bootstrap attribute record or (-1) if there is no match. 1868 int ConstantPool::find_matching_operand(int pattern_i, 1869 const constantPoolHandle& search_cp, int search_len) { 1870 for (int i = 0; i < search_len; i++) { 1871 bool found = compare_operand_to(pattern_i, search_cp, i); 1872 if (found) { 1873 return i; 1874 } 1875 } 1876 return -1; // bootstrap specifier data not found; return unused index (-1) 1877 } // end find_matching_operand() 1878 1879 1880 #ifndef PRODUCT 1881 1882 const char* ConstantPool::printable_name_at(int which) { 1883 1884 constantTag tag = tag_at(which); 1885 1886 if (tag.is_string()) { 1887 return string_at_noresolve(which); 1888 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 1889 return klass_name_at(which)->as_C_string(); 1890 } else if (tag.is_symbol()) { 1891 return symbol_at(which)->as_C_string(); 1892 } 1893 return ""; 1894 } 1895 1896 #endif // PRODUCT 1897 1898 1899 // JVMTI GetConstantPool support 1900 1901 // For debugging of constant pool 1902 const bool debug_cpool = false; 1903 1904 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) 1905 1906 static void print_cpool_bytes(jint cnt, u1 *bytes) { 1907 const char* WARN_MSG = "Must not be such entry!"; 1908 jint size = 0; 1909 u2 idx1, idx2; 1910 1911 for (jint idx = 1; idx < cnt; idx++) { 1912 jint ent_size = 0; 1913 u1 tag = *bytes++; 1914 size++; // count tag 1915 1916 printf("const #%03d, tag: %02d ", idx, tag); 1917 switch(tag) { 1918 case JVM_CONSTANT_Invalid: { 1919 printf("Invalid"); 1920 break; 1921 } 1922 case JVM_CONSTANT_Unicode: { 1923 printf("Unicode %s", WARN_MSG); 1924 break; 1925 } 1926 case JVM_CONSTANT_Utf8: { 1927 u2 len = Bytes::get_Java_u2(bytes); 1928 char str[128]; 1929 if (len > 127) { 1930 len = 127; 1931 } 1932 strncpy(str, (char *) (bytes+2), len); 1933 str[len] = '\0'; 1934 printf("Utf8 \"%s\"", str); 1935 ent_size = 2 + len; 1936 break; 1937 } 1938 case JVM_CONSTANT_Integer: { 1939 u4 val = Bytes::get_Java_u4(bytes); 1940 printf("int %d", *(int *) &val); 1941 ent_size = 4; 1942 break; 1943 } 1944 case JVM_CONSTANT_Float: { 1945 u4 val = Bytes::get_Java_u4(bytes); 1946 printf("float %5.3ff", *(float *) &val); 1947 ent_size = 4; 1948 break; 1949 } 1950 case JVM_CONSTANT_Long: { 1951 u8 val = Bytes::get_Java_u8(bytes); 1952 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val); 1953 ent_size = 8; 1954 idx++; // Long takes two cpool slots 1955 break; 1956 } 1957 case JVM_CONSTANT_Double: { 1958 u8 val = Bytes::get_Java_u8(bytes); 1959 printf("double %5.3fd", *(jdouble *)&val); 1960 ent_size = 8; 1961 idx++; // Double takes two cpool slots 1962 break; 1963 } 1964 case JVM_CONSTANT_Class: { 1965 idx1 = Bytes::get_Java_u2(bytes); 1966 printf("class #%03d", idx1); 1967 ent_size = 2; 1968 break; 1969 } 1970 case (JVM_CONSTANT_Class | JVM_CONSTANT_QDescBit): { 1971 idx1 = Bytes::get_Java_u2(bytes); 1972 printf("qclass #%03d", idx1); 1973 ent_size = 2; 1974 break; 1975 } 1976 case JVM_CONSTANT_String: { 1977 idx1 = Bytes::get_Java_u2(bytes); 1978 printf("String #%03d", idx1); 1979 ent_size = 2; 1980 break; 1981 } 1982 case JVM_CONSTANT_Fieldref: { 1983 idx1 = Bytes::get_Java_u2(bytes); 1984 idx2 = Bytes::get_Java_u2(bytes+2); 1985 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); 1986 ent_size = 4; 1987 break; 1988 } 1989 case JVM_CONSTANT_Methodref: { 1990 idx1 = Bytes::get_Java_u2(bytes); 1991 idx2 = Bytes::get_Java_u2(bytes+2); 1992 printf("Method #%03d, #%03d", idx1, idx2); 1993 ent_size = 4; 1994 break; 1995 } 1996 case JVM_CONSTANT_InterfaceMethodref: { 1997 idx1 = Bytes::get_Java_u2(bytes); 1998 idx2 = Bytes::get_Java_u2(bytes+2); 1999 printf("InterfMethod #%03d, #%03d", idx1, idx2); 2000 ent_size = 4; 2001 break; 2002 } 2003 case JVM_CONSTANT_NameAndType: { 2004 idx1 = Bytes::get_Java_u2(bytes); 2005 idx2 = Bytes::get_Java_u2(bytes+2); 2006 printf("NameAndType #%03d, #%03d", idx1, idx2); 2007 ent_size = 4; 2008 break; 2009 } 2010 case JVM_CONSTANT_ClassIndex: { 2011 printf("ClassIndex %s", WARN_MSG); 2012 break; 2013 } 2014 case JVM_CONSTANT_UnresolvedClass: { 2015 printf("UnresolvedClass: %s", WARN_MSG); 2016 break; 2017 } 2018 case (JVM_CONSTANT_UnresolvedClass | JVM_CONSTANT_QDescBit): { 2019 printf("UnresolvedQClass: %s", WARN_MSG); 2020 break; 2021 } 2022 case JVM_CONSTANT_UnresolvedClassInError: { 2023 printf("UnresolvedClassInErr: %s", WARN_MSG); 2024 break; 2025 } 2026 case JVM_CONSTANT_StringIndex: { 2027 printf("StringIndex: %s", WARN_MSG); 2028 break; 2029 } 2030 } 2031 printf(";\n"); 2032 bytes += ent_size; 2033 size += ent_size; 2034 } 2035 printf("Cpool size: %d\n", size); 2036 fflush(0); 2037 return; 2038 } /* end print_cpool_bytes */ 2039 2040 2041 // Returns size of constant pool entry. 2042 jint ConstantPool::cpool_entry_size(jint idx) { 2043 switch(tag_at(idx).value()) { 2044 case JVM_CONSTANT_Invalid: 2045 case JVM_CONSTANT_Unicode: 2046 return 1; 2047 2048 case JVM_CONSTANT_Utf8: 2049 return 3 + symbol_at(idx)->utf8_length(); 2050 2051 case JVM_CONSTANT_Class: 2052 case JVM_CONSTANT_String: 2053 case JVM_CONSTANT_ClassIndex: 2054 case JVM_CONSTANT_UnresolvedClass: 2055 case JVM_CONSTANT_UnresolvedClassInError: 2056 case JVM_CONSTANT_StringIndex: 2057 case JVM_CONSTANT_MethodType: 2058 case JVM_CONSTANT_MethodTypeInError: 2059 return 3; 2060 2061 case JVM_CONSTANT_MethodHandle: 2062 case JVM_CONSTANT_MethodHandleInError: 2063 return 4; //tag, ref_kind, ref_index 2064 2065 case JVM_CONSTANT_Integer: 2066 case JVM_CONSTANT_Float: 2067 case JVM_CONSTANT_Fieldref: 2068 case JVM_CONSTANT_Methodref: 2069 case JVM_CONSTANT_InterfaceMethodref: 2070 case JVM_CONSTANT_NameAndType: 2071 return 5; 2072 2073 case JVM_CONSTANT_Dynamic: 2074 case JVM_CONSTANT_DynamicInError: 2075 case JVM_CONSTANT_InvokeDynamic: 2076 // u1 tag, u2 bsm, u2 nt 2077 return 5; 2078 2079 case JVM_CONSTANT_Long: 2080 case JVM_CONSTANT_Double: 2081 return 9; 2082 } 2083 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); 2084 return 1; 2085 } /* end cpool_entry_size */ 2086 2087 2088 // SymbolHash is used to find a constant pool index from a string. 2089 // This function fills in SymbolHashs, one for utf8s and one for 2090 // class names, returns size of the cpool raw bytes. 2091 jint ConstantPool::hash_entries_to(SymbolHash *symmap, 2092 SymbolHash *classmap) { 2093 jint size = 0; 2094 2095 for (u2 idx = 1; idx < length(); idx++) { 2096 u2 tag = tag_at(idx).value(); 2097 size += cpool_entry_size(idx); 2098 2099 switch(tag) { 2100 case JVM_CONSTANT_Utf8: { 2101 Symbol* sym = symbol_at(idx); 2102 symmap->add_if_absent(sym, idx); 2103 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); 2104 break; 2105 } 2106 case JVM_CONSTANT_Class: 2107 case JVM_CONSTANT_UnresolvedClass: 2108 case JVM_CONSTANT_UnresolvedClassInError: { 2109 Symbol* sym = klass_name_at(idx); 2110 classmap->add_if_absent(sym, idx); 2111 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); 2112 break; 2113 } 2114 case JVM_CONSTANT_Long: 2115 case JVM_CONSTANT_Double: { 2116 idx++; // Both Long and Double take two cpool slots 2117 break; 2118 } 2119 } 2120 } 2121 return size; 2122 } /* end hash_utf8_entries_to */ 2123 2124 2125 // Copy cpool bytes. 2126 // Returns: 2127 // 0, in case of OutOfMemoryError 2128 // -1, in case of internal error 2129 // > 0, count of the raw cpool bytes that have been copied 2130 int ConstantPool::copy_cpool_bytes(int cpool_size, 2131 SymbolHash* tbl, 2132 unsigned char *bytes) { 2133 u2 idx1, idx2; 2134 jint size = 0; 2135 jint cnt = length(); 2136 unsigned char *start_bytes = bytes; 2137 2138 for (jint idx = 1; idx < cnt; idx++) { 2139 u1 tag = tag_at(idx).value(); 2140 jint ent_size = cpool_entry_size(idx); 2141 2142 assert(size + ent_size <= cpool_size, "Size mismatch"); 2143 2144 *bytes = tag; 2145 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag)); 2146 switch(tag) { 2147 case JVM_CONSTANT_Invalid: { 2148 DBG(printf("JVM_CONSTANT_Invalid")); 2149 break; 2150 } 2151 case JVM_CONSTANT_Unicode: { 2152 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); 2153 DBG(printf("JVM_CONSTANT_Unicode")); 2154 break; 2155 } 2156 case JVM_CONSTANT_Utf8: { 2157 Symbol* sym = symbol_at(idx); 2158 char* str = sym->as_utf8(); 2159 // Warning! It's crashing on x86 with len = sym->utf8_length() 2160 int len = (int) strlen(str); 2161 Bytes::put_Java_u2((address) (bytes+1), (u2) len); 2162 for (int i = 0; i < len; i++) { 2163 bytes[3+i] = (u1) str[i]; 2164 } 2165 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); 2166 break; 2167 } 2168 case JVM_CONSTANT_Integer: { 2169 jint val = int_at(idx); 2170 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 2171 break; 2172 } 2173 case JVM_CONSTANT_Float: { 2174 jfloat val = float_at(idx); 2175 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 2176 break; 2177 } 2178 case JVM_CONSTANT_Long: { 2179 jlong val = long_at(idx); 2180 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 2181 idx++; // Long takes two cpool slots 2182 break; 2183 } 2184 case JVM_CONSTANT_Double: { 2185 jdouble val = double_at(idx); 2186 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 2187 idx++; // Double takes two cpool slots 2188 break; 2189 } 2190 case JVM_CONSTANT_Class: 2191 case JVM_CONSTANT_UnresolvedClass: 2192 case JVM_CONSTANT_UnresolvedClassInError: { 2193 *bytes = JVM_CONSTANT_Class; 2194 Symbol* sym = klass_name_at(idx); 2195 idx1 = tbl->symbol_to_value(sym); 2196 assert(idx1 != 0, "Have not found a hashtable entry"); 2197 Bytes::put_Java_u2((address) (bytes+1), idx1); 2198 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); 2199 break; 2200 } 2201 case JVM_CONSTANT_String: { 2202 *bytes = JVM_CONSTANT_String; 2203 Symbol* sym = unresolved_string_at(idx); 2204 idx1 = tbl->symbol_to_value(sym); 2205 assert(idx1 != 0, "Have not found a hashtable entry"); 2206 Bytes::put_Java_u2((address) (bytes+1), idx1); 2207 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); 2208 break; 2209 } 2210 case JVM_CONSTANT_Fieldref: 2211 case JVM_CONSTANT_Methodref: 2212 case JVM_CONSTANT_InterfaceMethodref: { 2213 idx1 = uncached_klass_ref_index_at(idx); 2214 idx2 = uncached_name_and_type_ref_index_at(idx); 2215 Bytes::put_Java_u2((address) (bytes+1), idx1); 2216 Bytes::put_Java_u2((address) (bytes+3), idx2); 2217 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); 2218 break; 2219 } 2220 case JVM_CONSTANT_NameAndType: { 2221 idx1 = name_ref_index_at(idx); 2222 idx2 = signature_ref_index_at(idx); 2223 Bytes::put_Java_u2((address) (bytes+1), idx1); 2224 Bytes::put_Java_u2((address) (bytes+3), idx2); 2225 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); 2226 break; 2227 } 2228 case JVM_CONSTANT_ClassIndex: { 2229 *bytes = JVM_CONSTANT_Class; 2230 idx1 = klass_index_at(idx); 2231 Bytes::put_Java_u2((address) (bytes+1), idx1); 2232 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); 2233 break; 2234 } 2235 case JVM_CONSTANT_StringIndex: { 2236 *bytes = JVM_CONSTANT_String; 2237 idx1 = string_index_at(idx); 2238 Bytes::put_Java_u2((address) (bytes+1), idx1); 2239 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); 2240 break; 2241 } 2242 case JVM_CONSTANT_MethodHandle: 2243 case JVM_CONSTANT_MethodHandleInError: { 2244 *bytes = JVM_CONSTANT_MethodHandle; 2245 int kind = method_handle_ref_kind_at(idx); 2246 idx1 = method_handle_index_at(idx); 2247 *(bytes+1) = (unsigned char) kind; 2248 Bytes::put_Java_u2((address) (bytes+2), idx1); 2249 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); 2250 break; 2251 } 2252 case JVM_CONSTANT_MethodType: 2253 case JVM_CONSTANT_MethodTypeInError: { 2254 *bytes = JVM_CONSTANT_MethodType; 2255 idx1 = method_type_index_at(idx); 2256 Bytes::put_Java_u2((address) (bytes+1), idx1); 2257 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); 2258 break; 2259 } 2260 case JVM_CONSTANT_Dynamic: 2261 case JVM_CONSTANT_DynamicInError: { 2262 *bytes = tag; 2263 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 2264 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 2265 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4"); 2266 Bytes::put_Java_u2((address) (bytes+1), idx1); 2267 Bytes::put_Java_u2((address) (bytes+3), idx2); 2268 DBG(printf("JVM_CONSTANT_Dynamic: %hd %hd", idx1, idx2)); 2269 break; 2270 } 2271 case JVM_CONSTANT_InvokeDynamic: { 2272 *bytes = tag; 2273 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 2274 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 2275 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4"); 2276 Bytes::put_Java_u2((address) (bytes+1), idx1); 2277 Bytes::put_Java_u2((address) (bytes+3), idx2); 2278 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); 2279 break; 2280 } 2281 } 2282 DBG(printf("\n")); 2283 bytes += ent_size; 2284 size += ent_size; 2285 } 2286 assert(size == cpool_size, "Size mismatch"); 2287 2288 // Keep temporarily for debugging until it's stable. 2289 DBG(print_cpool_bytes(cnt, start_bytes)); 2290 return (int)(bytes - start_bytes); 2291 } /* end copy_cpool_bytes */ 2292 2293 #undef DBG 2294 2295 bool ConstantPool::is_maybe_on_stack() const { 2296 // This method uses the similar logic as nmethod::is_maybe_on_stack() 2297 if (!Continuations::enabled()) { 2298 return false; 2299 } 2300 2301 // If the condition below is true, it means that the nmethod was found to 2302 // be alive the previous completed marking cycle. 2303 return cache()->gc_epoch() >= CodeCache::previous_completed_gc_marking_cycle(); 2304 } 2305 2306 // For redefinition, if any methods found in loom stack chunks, the gc_epoch is 2307 // recorded in their constant pool cache. The on_stack-ness of the constant pool controls whether 2308 // memory for the method is reclaimed. 2309 bool ConstantPool::on_stack() const { 2310 if ((_flags &_on_stack) != 0) { 2311 return true; 2312 } 2313 2314 if (_cache == nullptr) { 2315 return false; 2316 } 2317 2318 return is_maybe_on_stack(); 2319 } 2320 2321 void ConstantPool::set_on_stack(const bool value) { 2322 if (value) { 2323 // Only record if it's not already set. 2324 if (!on_stack()) { 2325 assert(!is_shared(), "should always be set for shared constant pools"); 2326 _flags |= _on_stack; 2327 MetadataOnStackMark::record(this); 2328 } 2329 } else { 2330 // Clearing is done single-threadedly. 2331 if (!is_shared()) { 2332 _flags &= ~_on_stack; 2333 } 2334 } 2335 } 2336 2337 // Printing 2338 2339 void ConstantPool::print_on(outputStream* st) const { 2340 assert(is_constantPool(), "must be constantPool"); 2341 st->print_cr("%s", internal_name()); 2342 if (flags() != 0) { 2343 st->print(" - flags: 0x%x", flags()); 2344 if (has_preresolution()) st->print(" has_preresolution"); 2345 if (on_stack()) st->print(" on_stack"); 2346 st->cr(); 2347 } 2348 if (pool_holder() != NULL) { 2349 st->print_cr(" - holder: " PTR_FORMAT, p2i(pool_holder())); 2350 } 2351 st->print_cr(" - cache: " PTR_FORMAT, p2i(cache())); 2352 st->print_cr(" - resolved_references: " PTR_FORMAT, p2i(resolved_references_or_null())); 2353 st->print_cr(" - reference_map: " PTR_FORMAT, p2i(reference_map())); 2354 st->print_cr(" - resolved_klasses: " PTR_FORMAT, p2i(resolved_klasses())); 2355 st->print_cr(" - cp length: %d", length()); 2356 2357 for (int index = 1; index < length(); index++) { // Index 0 is unused 2358 ((ConstantPool*)this)->print_entry_on(index, st); 2359 switch (tag_at(index).value()) { 2360 case JVM_CONSTANT_Long : 2361 case JVM_CONSTANT_Double : 2362 index++; // Skip entry following eigth-byte constant 2363 } 2364 2365 } 2366 st->cr(); 2367 } 2368 2369 // Print one constant pool entry 2370 void ConstantPool::print_entry_on(const int index, outputStream* st) { 2371 EXCEPTION_MARK; 2372 st->print(" - %3d : ", index); 2373 tag_at(index).print_on(st); 2374 st->print(" : "); 2375 switch (tag_at(index).value()) { 2376 case JVM_CONSTANT_Class : 2377 { Klass* k = klass_at(index, CATCH); 2378 guarantee(k != NULL, "need klass"); 2379 k->print_value_on(st); 2380 st->print(" {" PTR_FORMAT "}", p2i(k)); 2381 } 2382 break; 2383 case JVM_CONSTANT_Fieldref : 2384 case JVM_CONSTANT_Methodref : 2385 case JVM_CONSTANT_InterfaceMethodref : 2386 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); 2387 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); 2388 break; 2389 case JVM_CONSTANT_String : 2390 unresolved_string_at(index)->print_value_on(st); 2391 break; 2392 case JVM_CONSTANT_Integer : 2393 st->print("%d", int_at(index)); 2394 break; 2395 case JVM_CONSTANT_Float : 2396 st->print("%f", float_at(index)); 2397 break; 2398 case JVM_CONSTANT_Long : 2399 st->print_jlong(long_at(index)); 2400 break; 2401 case JVM_CONSTANT_Double : 2402 st->print("%lf", double_at(index)); 2403 break; 2404 case JVM_CONSTANT_NameAndType : 2405 st->print("name_index=%d", name_ref_index_at(index)); 2406 st->print(" signature_index=%d", signature_ref_index_at(index)); 2407 break; 2408 case JVM_CONSTANT_Utf8 : 2409 symbol_at(index)->print_value_on(st); 2410 break; 2411 case JVM_CONSTANT_ClassIndex: { 2412 int name_index = *int_at_addr(index); 2413 st->print("klass_index=%d ", name_index); 2414 symbol_at(name_index)->print_value_on(st); 2415 } 2416 break; 2417 case JVM_CONSTANT_UnresolvedClass : // fall-through 2418 case JVM_CONSTANT_UnresolvedClassInError: { 2419 CPKlassSlot kslot = klass_slot_at(index); 2420 int resolved_klass_index = kslot.resolved_klass_index(); 2421 int name_index = kslot.name_index(); 2422 assert(tag_at(name_index).is_symbol(), "sanity"); 2423 symbol_at(name_index)->print_value_on(st); 2424 } 2425 break; 2426 case JVM_CONSTANT_MethodHandle : 2427 case JVM_CONSTANT_MethodHandleInError : 2428 st->print("ref_kind=%d", method_handle_ref_kind_at(index)); 2429 st->print(" ref_index=%d", method_handle_index_at(index)); 2430 break; 2431 case JVM_CONSTANT_MethodType : 2432 case JVM_CONSTANT_MethodTypeInError : 2433 st->print("signature_index=%d", method_type_index_at(index)); 2434 break; 2435 case JVM_CONSTANT_Dynamic : 2436 case JVM_CONSTANT_DynamicInError : 2437 { 2438 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index)); 2439 st->print(" type_index=%d", bootstrap_name_and_type_ref_index_at(index)); 2440 int argc = bootstrap_argument_count_at(index); 2441 if (argc > 0) { 2442 for (int arg_i = 0; arg_i < argc; arg_i++) { 2443 int arg = bootstrap_argument_index_at(index, arg_i); 2444 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 2445 } 2446 st->print("}"); 2447 } 2448 } 2449 break; 2450 case JVM_CONSTANT_InvokeDynamic : 2451 { 2452 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index)); 2453 st->print(" name_and_type_index=%d", bootstrap_name_and_type_ref_index_at(index)); 2454 int argc = bootstrap_argument_count_at(index); 2455 if (argc > 0) { 2456 for (int arg_i = 0; arg_i < argc; arg_i++) { 2457 int arg = bootstrap_argument_index_at(index, arg_i); 2458 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 2459 } 2460 st->print("}"); 2461 } 2462 } 2463 break; 2464 default: 2465 ShouldNotReachHere(); 2466 break; 2467 } 2468 st->cr(); 2469 } 2470 2471 void ConstantPool::print_value_on(outputStream* st) const { 2472 assert(is_constantPool(), "must be constantPool"); 2473 st->print("constant pool [%d]", length()); 2474 if (has_preresolution()) st->print("/preresolution"); 2475 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); 2476 print_address_on(st); 2477 if (pool_holder() != NULL) { 2478 st->print(" for "); 2479 pool_holder()->print_value_on(st); 2480 bool extra = (pool_holder()->constants() != this); 2481 if (extra) st->print(" (extra)"); 2482 } 2483 if (cache() != NULL) { 2484 st->print(" cache=" PTR_FORMAT, p2i(cache())); 2485 } 2486 } 2487 2488 // Verification 2489 2490 void ConstantPool::verify_on(outputStream* st) { 2491 guarantee(is_constantPool(), "object must be constant pool"); 2492 for (int i = 0; i< length(); i++) { 2493 constantTag tag = tag_at(i); 2494 if (tag.is_klass() || tag.is_unresolved_klass()) { 2495 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count"); 2496 } else if (tag.is_symbol()) { 2497 Symbol* entry = symbol_at(i); 2498 guarantee(entry->refcount() != 0, "should have nonzero reference count"); 2499 } else if (tag.is_string()) { 2500 Symbol* entry = unresolved_string_at(i); 2501 guarantee(entry->refcount() != 0, "should have nonzero reference count"); 2502 } 2503 } 2504 if (pool_holder() != NULL) { 2505 // Note: pool_holder() can be NULL in temporary constant pools 2506 // used during constant pool merging 2507 guarantee(pool_holder()->is_klass(), "should be klass"); 2508 } 2509 }