1 /* 2 * Copyright (c) 1997, 2018, 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 "jvm.h" 27 #include "classfile/classLoaderData.hpp" 28 #include "classfile/javaClasses.inline.hpp" 29 #include "classfile/metadataOnStackMark.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "classfile/vmSymbols.hpp" 33 #include "interpreter/linkResolver.hpp" 34 #include "memory/allocation.inline.hpp" 35 #include "memory/heapInspection.hpp" 36 #include "memory/metadataFactory.hpp" 37 #include "memory/metaspaceClosure.hpp" 38 #include "memory/metaspaceShared.hpp" 39 #include "memory/oopFactory.hpp" 40 #include "memory/resourceArea.hpp" 41 #include "oops/constantPool.hpp" 42 #include "oops/instanceKlass.hpp" 43 #include "oops/objArrayKlass.hpp" 44 #include "oops/objArrayOop.inline.hpp" 45 #include "oops/oop.inline.hpp" 46 #include "runtime/fieldType.hpp" 47 #include "runtime/init.hpp" 48 #include "runtime/javaCalls.hpp" 49 #include "runtime/signature.hpp" 50 #include "runtime/vframe.hpp" 51 #include "utilities/copy.hpp" 52 53 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { 54 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL); 55 int size = ConstantPool::size(length); 56 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); 57 } 58 59 #ifdef ASSERT 60 61 // MetaspaceObj allocation invariant is calloc equivalent memory 62 // simple verification of this here (JVM_CONSTANT_Invalid == 0 ) 63 static bool tag_array_is_zero_initialized(Array<u1>* tags) { 64 assert(tags != NULL, "invariant"); 65 const int length = tags->length(); 66 for (int index = 0; index < length; ++index) { 67 if (JVM_CONSTANT_Invalid != tags->at(index)) { 68 return false; 69 } 70 } 71 return true; 72 } 73 74 #endif 75 76 ConstantPool::ConstantPool(Array<u1>* tags) : 77 _tags(tags), 78 _length(tags->length()) { 79 80 assert(_tags != NULL, "invariant"); 81 assert(tags->length() == _length, "invariant"); 82 assert(tag_array_is_zero_initialized(tags), "invariant"); 83 assert(0 == flags(), "invariant"); 84 assert(0 == version(), "invariant"); 85 assert(NULL == _pool_holder, "invariant"); 86 } 87 88 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { 89 if (cache() != NULL) { 90 MetadataFactory::free_metadata(loader_data, cache()); 91 set_cache(NULL); 92 } 93 94 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses()); 95 set_resolved_klasses(NULL); 96 97 MetadataFactory::free_array<jushort>(loader_data, operands()); 98 set_operands(NULL); 99 100 release_C_heap_structures(); 101 102 // free tag array 103 MetadataFactory::free_array<u1>(loader_data, tags()); 104 set_tags(NULL); 105 } 106 107 void ConstantPool::release_C_heap_structures() { 108 // walk constant pool and decrement symbol reference counts 109 unreference_symbols(); 110 } 111 112 void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) { 113 log_trace(cds)("Iter(ConstantPool): %p", this); 114 115 it->push(&_tags, MetaspaceClosure::_writable); 116 it->push(&_cache); 117 it->push(&_pool_holder); 118 it->push(&_operands); 119 it->push(&_resolved_klasses, MetaspaceClosure::_writable); 120 121 for (int i = 0; i < length(); i++) { 122 // The only MSO's embedded in the CP entries are Symbols: 123 // JVM_CONSTANT_String (normal and pseudo) 124 // JVM_CONSTANT_Utf8 125 constantTag ctag = tag_at(i); 126 if (ctag.is_string() || ctag.is_utf8()) { 127 it->push(symbol_at_addr(i)); 128 } 129 } 130 } 131 132 objArrayOop ConstantPool::resolved_references() const { 133 return (objArrayOop)_cache->resolved_references(); 134 } 135 136 // Called from outside constant pool resolution where a resolved_reference array 137 // may not be present. 138 objArrayOop ConstantPool::resolved_references_or_null() const { 139 if (_cache == NULL) { 140 return NULL; 141 } else { 142 return (objArrayOop)_cache->resolved_references(); 143 } 144 } 145 146 // Create resolved_references array and mapping array for original cp indexes 147 // The ldc bytecode was rewritten to have the resolved reference array index so need a way 148 // to map it back for resolving and some unlikely miscellaneous uses. 149 // The objects created by invokedynamic are appended to this list. 150 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, 151 const intStack& reference_map, 152 int constant_pool_map_length, 153 TRAPS) { 154 // Initialized the resolved object cache. 155 int map_length = reference_map.length(); 156 if (map_length > 0) { 157 // Only need mapping back to constant pool entries. The map isn't used for 158 // invokedynamic resolved_reference entries. For invokedynamic entries, 159 // the constant pool cache index has the mapping back to both the constant 160 // pool and to the resolved reference index. 161 if (constant_pool_map_length > 0) { 162 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK); 163 164 for (int i = 0; i < constant_pool_map_length; i++) { 165 int x = reference_map.at(i); 166 assert(x == (int)(jushort) x, "klass index is too big"); 167 om->at_put(i, (jushort)x); 168 } 169 set_reference_map(om); 170 } 171 172 // Create Java array for holding resolved strings, methodHandles, 173 // methodTypes, invokedynamic and invokehandle appendix objects, etc. 174 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 175 Handle refs_handle (THREAD, (oop)stom); // must handleize. 176 set_resolved_references(loader_data->add_handle(refs_handle)); 177 } 178 } 179 180 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) { 181 // A ConstantPool can't possibly have 0xffff valid class entries, 182 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8 183 // entry for the class's name. So at most we will have 0xfffe class entries. 184 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate 185 // UnresolvedKlass entries that are temporarily created during class redefinition. 186 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity"); 187 assert(resolved_klasses() == NULL, "sanity"); 188 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK); 189 set_resolved_klasses(rk); 190 } 191 192 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) { 193 int len = length(); 194 int num_klasses = 0; 195 for (int i = 1; i <len; i++) { 196 switch (tag_at(i).value()) { 197 case JVM_CONSTANT_ClassIndex: 198 { 199 const int class_index = klass_index_at(i); 200 unresolved_klass_at_put(i, class_index, num_klasses++); 201 } 202 break; 203 case JVM_CONSTANT_ValueIndex: 204 { 205 const int class_index = value_type_index_at(i); 206 unresolved_value_type_at_put(i, class_index, num_klasses++); 207 } 208 break; 209 #ifndef PRODUCT 210 case JVM_CONSTANT_Class: 211 case JVM_CONSTANT_UnresolvedClass: 212 case JVM_CONSTANT_UnresolvedClassInError: 213 case JVM_CONSTANT_Value: 214 case JVM_CONSTANT_UnresolvedValue: 215 case JVM_CONSTANT_UnresolvedValueInError: 216 // All of these should have been reverted back to Unresolved before calling 217 // this function. 218 ShouldNotReachHere(); 219 #endif 220 } 221 } 222 allocate_resolved_klasses(loader_data, num_klasses, THREAD); 223 } 224 225 // Anonymous class support: 226 void ConstantPool::klass_at_put(int class_index, int name_index, int resolved_klass_index, Klass* k, Symbol* name) { 227 assert(is_within_bounds(class_index), "index out of bounds"); 228 assert(is_within_bounds(name_index), "index out of bounds"); 229 assert((resolved_klass_index & 0xffff0000) == 0, "must be"); 230 *int_at_addr(class_index) = 231 build_int_from_shorts((jushort)resolved_klass_index, (jushort)name_index); 232 233 symbol_at_put(name_index, name); 234 name->increment_refcount(); 235 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index); 236 OrderAccess::release_store(adr, k); 237 238 // The interpreter assumes when the tag is stored, the klass is resolved 239 // and the Klass* non-NULL, so we need hardware store ordering here. 240 if (k != NULL) { 241 release_tag_at_put(class_index, (k->is_value() ? (jbyte)JVM_CONSTANT_Value : JVM_CONSTANT_Class)); 242 } else { 243 release_tag_at_put(class_index, (tag_at(class_index).is_value_type_or_reference() ? 244 JVM_CONSTANT_UnresolvedValue : JVM_CONSTANT_UnresolvedClass)); 245 } 246 } 247 248 // Anonymous class support: 249 void ConstantPool::klass_at_put(int class_index, Klass* k) { 250 assert(k != NULL, "must be valid klass"); 251 CPKlassSlot kslot = klass_slot_at(class_index); 252 int resolved_klass_index = kslot.resolved_klass_index(); 253 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index); 254 OrderAccess::release_store(adr, k); 255 256 // The interpreter assumes when the tag is stored, the klass is resolved 257 // and the Klass* non-NULL, so we need hardware store ordering here. 258 release_tag_at_put(class_index, (k->is_value() ? (jbyte)JVM_CONSTANT_Value : JVM_CONSTANT_Class)); 259 } 260 261 #if INCLUDE_CDS_JAVA_HEAP 262 // Archive the resolved references 263 void ConstantPool::archive_resolved_references(Thread* THREAD) { 264 if (_cache == NULL) { 265 return; // nothing to do 266 } 267 268 InstanceKlass *ik = pool_holder(); 269 if (!(ik->is_shared_boot_class() || ik->is_shared_platform_class() || 270 ik->is_shared_app_class())) { 271 // Archiving resolved references for classes from non-builtin loaders 272 // is not yet supported. 273 set_resolved_references(NULL); 274 return; 275 } 276 277 objArrayOop rr = resolved_references(); 278 Array<u2>* ref_map = reference_map(); 279 if (rr != NULL) { 280 int ref_map_len = ref_map == NULL ? 0 : ref_map->length(); 281 int rr_len = rr->length(); 282 for (int i = 0; i < rr_len; i++) { 283 oop p = rr->obj_at(i); 284 rr->obj_at_put(i, NULL); 285 if (p != NULL && i < ref_map_len) { 286 int index = object_to_cp_index(i); 287 // Skip the entry if the string hash code is 0 since the string 288 // is not included in the shared string_table, see StringTable::copy_shared_string. 289 if (tag_at(index).is_string() && java_lang_String::hash_code(p) != 0) { 290 oop op = StringTable::create_archived_string(p, THREAD); 291 // If the String object is not archived (possibly too large), 292 // NULL is returned. Also set it in the array, so we won't 293 // have a 'bad' reference in the archived resolved_reference 294 // array. 295 rr->obj_at_put(i, op); 296 } 297 } 298 } 299 300 oop archived = MetaspaceShared::archive_heap_object(rr, THREAD); 301 _cache->set_archived_references(archived); 302 set_resolved_references(NULL); 303 } 304 } 305 306 void ConstantPool::resolve_class_constants(TRAPS) { 307 assert(DumpSharedSpaces, "used during dump time only"); 308 // The _cache may be NULL if the _pool_holder klass fails verification 309 // at dump time due to missing dependencies. 310 if (cache() == NULL || reference_map() == NULL) { 311 return; // nothing to do 312 } 313 314 constantPoolHandle cp(THREAD, this); 315 for (int index = 1; index < length(); index++) { // Index 0 is unused 316 if (tag_at(index).is_string() && !cp->is_pseudo_string_at(index)) { 317 int cache_index = cp->cp_to_object_index(index); 318 string_at_impl(cp, index, cache_index, CHECK); 319 } 320 } 321 } 322 #endif 323 324 // CDS support. Create a new resolved_references array. 325 void ConstantPool::restore_unshareable_info(TRAPS) { 326 assert(is_constantPool(), "ensure C++ vtable is restored"); 327 assert(on_stack(), "should always be set for shared constant pools"); 328 assert(is_shared(), "should always be set for shared constant pools"); 329 assert(_cache != NULL, "constant pool _cache should not be NULL"); 330 331 // Only create the new resolved references array if it hasn't been attempted before 332 if (resolved_references() != NULL) return; 333 334 // restore the C++ vtable from the shared archive 335 restore_vtable(); 336 337 if (SystemDictionary::Object_klass_loaded()) { 338 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 339 #if INCLUDE_CDS_JAVA_HEAP 340 if (MetaspaceShared::open_archive_heap_region_mapped() && 341 _cache->archived_references() != NULL) { 342 oop archived = _cache->archived_references(); 343 // Create handle for the archived resolved reference array object 344 Handle refs_handle(THREAD, archived); 345 set_resolved_references(loader_data->add_handle(refs_handle)); 346 } else 347 #endif 348 { 349 // No mapped archived resolved reference array 350 // Recreate the object array and add to ClassLoaderData. 351 int map_length = resolved_reference_length(); 352 if (map_length > 0) { 353 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 354 Handle refs_handle(THREAD, (oop)stom); // must handleize. 355 set_resolved_references(loader_data->add_handle(refs_handle)); 356 } 357 } 358 } 359 } 360 361 void ConstantPool::remove_unshareable_info() { 362 // Resolved references are not in the shared archive. 363 // Save the length for restoration. It is not necessarily the same length 364 // as reference_map.length() if invokedynamic is saved. It is needed when 365 // re-creating the resolved reference array if archived heap data cannot be map 366 // at runtime. 367 set_resolved_reference_length( 368 resolved_references() != NULL ? resolved_references()->length() : 0); 369 370 // If archiving heap objects is not allowed, clear the resolved references. 371 // Otherwise, it is cleared after the resolved references array is cached 372 // (see archive_resolved_references()). 373 if (!MetaspaceShared::is_heap_object_archiving_allowed()) { 374 set_resolved_references(NULL); 375 } 376 377 // Shared ConstantPools are in the RO region, so the _flags cannot be modified. 378 // The _on_stack flag is used to prevent ConstantPools from deallocation during 379 // class redefinition. Since shared ConstantPools cannot be deallocated anyway, 380 // we always set _on_stack to true to avoid having to change _flags during runtime. 381 _flags |= (_on_stack | _is_shared); 382 int num_klasses = 0; 383 for (int index = 1; index < length(); index++) { // Index 0 is unused 384 assert(!tag_at(index).is_unresolved_klass_in_error(), "This must not happen during dump time"); 385 if (tag_at(index).is_klass()) { 386 // This class was resolved as a side effect of executing Java code 387 // during dump time. We need to restore it back to an UnresolvedClass, 388 // so that the proper class loading and initialization can happen 389 // at runtime. 390 CPKlassSlot kslot = klass_slot_at(index); 391 int resolved_klass_index = kslot.resolved_klass_index(); 392 int name_index = kslot.name_index(); 393 assert(tag_at(name_index).is_symbol(), "sanity"); 394 resolved_klasses()->at_put(resolved_klass_index, NULL); 395 tag_at_put(index, JVM_CONSTANT_UnresolvedClass); 396 assert(klass_name_at(index) == symbol_at(name_index), "sanity"); 397 } 398 } 399 if (cache() != NULL) { 400 cache()->remove_unshareable_info(); 401 } 402 } 403 404 int ConstantPool::cp_to_object_index(int cp_index) { 405 // this is harder don't do this so much. 406 int i = reference_map()->find(cp_index); 407 // We might not find the index for jsr292 call. 408 return (i < 0) ? _no_index_sentinel : i; 409 } 410 411 void ConstantPool::string_at_put(int which, int obj_index, oop str) { 412 resolved_references()->obj_at_put(obj_index, str); 413 } 414 415 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) { 416 ResourceMark rm; 417 int line_number = -1; 418 const char * source_file = NULL; 419 if (JavaThread::current()->has_last_Java_frame()) { 420 // try to identify the method which called this function. 421 vframeStream vfst(JavaThread::current()); 422 if (!vfst.at_end()) { 423 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 424 Symbol* s = vfst.method()->method_holder()->source_file_name(); 425 if (s != NULL) { 426 source_file = s->as_C_string(); 427 } 428 } 429 } 430 if (k != this_cp->pool_holder()) { 431 // only print something if the classes are different 432 if (source_file != NULL) { 433 log_debug(class, resolve)("%s %s %s:%d", 434 this_cp->pool_holder()->external_name(), 435 k->external_name(), source_file, line_number); 436 } else { 437 log_debug(class, resolve)("%s %s", 438 this_cp->pool_holder()->external_name(), 439 k->external_name()); 440 } 441 } 442 } 443 444 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which, 445 bool save_resolution_error, TRAPS) { 446 assert(THREAD->is_Java_thread(), "must be a Java thread"); 447 448 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 449 // It is not safe to rely on the tag bit's here, since we don't have a lock, and 450 // the entry and tag is not updated atomicly. 451 CPKlassSlot kslot = this_cp->klass_slot_at(which); 452 int resolved_klass_index = kslot.resolved_klass_index(); 453 int name_index = kslot.name_index(); 454 assert(this_cp->tag_at(name_index).is_symbol(), "sanity"); 455 456 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index); 457 458 if (klass != NULL) { 459 return klass; 460 } 461 462 // This tag doesn't change back to unresolved class unless at a safepoint. 463 if (this_cp->tag_at(which).is_unresolved_klass_in_error() || 464 this_cp->tag_at(which).is_unresolved_value_type_in_error()) { 465 // The original attempt to resolve this constant pool entry failed so find the 466 // class of the original error and throw another error of the same class 467 // (JVMS 5.4.3). 468 // If there is a detail message, pass that detail message to the error. 469 // The JVMS does not strictly require us to duplicate the same detail message, 470 // or any internal exception fields such as cause or stacktrace. But since the 471 // detail message is often a class name or other literal string, we will repeat it 472 // if we can find it in the symbol table. 473 throw_resolution_error(this_cp, which, CHECK_0); 474 ShouldNotReachHere(); 475 } 476 477 Handle mirror_handle; 478 Symbol* name = this_cp->symbol_at(name_index); 479 Handle loader (THREAD, this_cp->pool_holder()->class_loader()); 480 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain()); 481 Klass* k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD); 482 if (!HAS_PENDING_EXCEPTION) { 483 // preserve the resolved klass from unloading 484 mirror_handle = Handle(THREAD, k->java_mirror()); 485 // Do access check for klasses 486 verify_constant_pool_resolve(this_cp, k, THREAD); 487 } 488 489 // Failed to resolve class. We must record the errors so that subsequent attempts 490 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). 491 if (HAS_PENDING_EXCEPTION) { 492 if (save_resolution_error) { 493 bool is_value_type_tag = this_cp->tag_at(which).is_value_type_or_reference(); 494 save_and_throw_exception(this_cp, which, 495 constantTag((is_value_type_tag ? JVM_CONSTANT_UnresolvedValue : JVM_CONSTANT_UnresolvedClass)), 496 CHECK_NULL); 497 // If CHECK_NULL above doesn't return the exception, that means that 498 // some other thread has beaten us and has resolved the class. 499 // To preserve old behavior, we return the resolved class. 500 klass = this_cp->resolved_klasses()->at(resolved_klass_index); 501 assert(klass != NULL, "must be resolved if exception was cleared"); 502 return klass; 503 } else { 504 return NULL; // return the pending exception 505 } 506 } 507 508 // Make this class loader depend upon the class loader owning the class reference 509 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data(); 510 this_key->record_dependency(k, CHECK_NULL); // Can throw OOM 511 512 // logging for class+resolve. 513 if (log_is_enabled(Debug, class, resolve)){ 514 trace_class_resolution(this_cp, k); 515 } 516 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index); 517 OrderAccess::release_store(adr, k); 518 // The interpreter assumes when the tag is stored, the klass is resolved 519 // and the Klass* stored in _resolved_klasses is non-NULL, so we need 520 // hardware store ordering here. 521 this_cp->release_tag_at_put(which, (k->is_value() ? (jbyte)JVM_CONSTANT_Value : JVM_CONSTANT_Class)); 522 return k; 523 } 524 525 526 // Does not update ConstantPool* - to avoid any exception throwing. Used 527 // by compiler and exception handling. Also used to avoid classloads for 528 // instanceof operations. Returns NULL if the class has not been loaded or 529 // if the verification of constant pool failed 530 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) { 531 CPKlassSlot kslot = this_cp->klass_slot_at(which); 532 int resolved_klass_index = kslot.resolved_klass_index(); 533 int name_index = kslot.name_index(); 534 assert(this_cp->tag_at(name_index).is_symbol(), "sanity"); 535 536 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index); 537 if (k != NULL) { 538 return k; 539 } else { 540 Thread *thread = Thread::current(); 541 Symbol* name = this_cp->symbol_at(name_index); 542 oop loader = this_cp->pool_holder()->class_loader(); 543 oop protection_domain = this_cp->pool_holder()->protection_domain(); 544 Handle h_prot (thread, protection_domain); 545 Handle h_loader (thread, loader); 546 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); 547 548 if (k != NULL) { 549 // Make sure that resolving is legal 550 EXCEPTION_MARK; 551 // return NULL if verification fails 552 verify_constant_pool_resolve(this_cp, k, THREAD); 553 if (HAS_PENDING_EXCEPTION) { 554 CLEAR_PENDING_EXCEPTION; 555 return NULL; 556 } 557 return k; 558 } else { 559 return k; 560 } 561 } 562 } 563 564 565 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) { 566 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which)); 567 } 568 569 570 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool, 571 int which) { 572 if (cpool->cache() == NULL) return NULL; // nothing to load yet 573 int cache_index = decode_cpcache_index(which, true); 574 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { 575 // FIXME: should be an assert 576 log_debug(class, resolve)("bad operand %d in:", which); cpool->print(); 577 return NULL; 578 } 579 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 580 return e->method_if_resolved(cpool); 581 } 582 583 584 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 585 if (cpool->cache() == NULL) return false; // nothing to load yet 586 int cache_index = decode_cpcache_index(which, true); 587 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 588 return e->has_appendix(); 589 } 590 591 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 592 if (cpool->cache() == NULL) return NULL; // nothing to load yet 593 int cache_index = decode_cpcache_index(which, true); 594 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 595 return e->appendix_if_resolved(cpool); 596 } 597 598 599 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) { 600 if (cpool->cache() == NULL) return false; // nothing to load yet 601 int cache_index = decode_cpcache_index(which, true); 602 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 603 return e->has_method_type(); 604 } 605 606 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) { 607 if (cpool->cache() == NULL) return NULL; // nothing to load yet 608 int cache_index = decode_cpcache_index(which, true); 609 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 610 return e->method_type_if_resolved(cpool); 611 } 612 613 614 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { 615 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 616 return symbol_at(name_index); 617 } 618 619 620 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { 621 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 622 return symbol_at(signature_index); 623 } 624 625 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { 626 int i = which; 627 if (!uncached && cache() != NULL) { 628 if (ConstantPool::is_invokedynamic_index(which)) { 629 // Invokedynamic index is index into the constant pool cache 630 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); 631 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); 632 assert(tag_at(pool_index).is_name_and_type(), ""); 633 return pool_index; 634 } 635 // change byte-ordering and go via cache 636 i = remap_instruction_operand_from_cache(which); 637 } else { 638 if (tag_at(which).is_invoke_dynamic() || 639 tag_at(which).is_dynamic_constant() || 640 tag_at(which).is_dynamic_constant_in_error()) { 641 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); 642 assert(tag_at(pool_index).is_name_and_type(), ""); 643 return pool_index; 644 } 645 } 646 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 647 assert(!tag_at(i).is_invoke_dynamic() && 648 !tag_at(i).is_dynamic_constant() && 649 !tag_at(i).is_dynamic_constant_in_error(), "Must be handled above"); 650 jint ref_index = *int_at_addr(i); 651 return extract_high_short_from_int(ref_index); 652 } 653 654 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) { 655 int pool_index = which; 656 if (!uncached && cache() != NULL) { 657 if (ConstantPool::is_invokedynamic_index(which)) { 658 // Invokedynamic index is index into resolved_references 659 pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); 660 } else { 661 // change byte-ordering and go via cache 662 pool_index = remap_instruction_operand_from_cache(which); 663 } 664 } 665 return tag_at(pool_index); 666 } 667 668 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { 669 guarantee(!ConstantPool::is_invokedynamic_index(which), 670 "an invokedynamic instruction does not have a klass"); 671 int i = which; 672 if (!uncached && cache() != NULL) { 673 // change byte-ordering and go via cache 674 i = remap_instruction_operand_from_cache(which); 675 } 676 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 677 jint ref_index = *int_at_addr(i); 678 return extract_low_short_from_int(ref_index); 679 } 680 681 682 683 int ConstantPool::remap_instruction_operand_from_cache(int operand) { 684 int cpc_index = operand; 685 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); 686 assert((int)(u2)cpc_index == cpc_index, "clean u2"); 687 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); 688 return member_index; 689 } 690 691 692 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) { 693 if (!(k->is_instance_klass() || k->is_objArray_klass())) { 694 return; // short cut, typeArray klass is always accessible 695 } 696 Klass* holder = this_cp->pool_holder(); 697 bool fold_type_to_class = true; 698 LinkResolver::check_klass_accessability(holder, k, fold_type_to_class, CHECK); 699 } 700 701 702 int ConstantPool::name_ref_index_at(int which_nt) { 703 jint ref_index = name_and_type_at(which_nt); 704 return extract_low_short_from_int(ref_index); 705 } 706 707 708 int ConstantPool::signature_ref_index_at(int which_nt) { 709 jint ref_index = name_and_type_at(which_nt); 710 return extract_high_short_from_int(ref_index); 711 } 712 713 714 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { 715 return klass_at(klass_ref_index_at(which), THREAD); 716 } 717 718 Symbol* ConstantPool::klass_name_at(int which) const { 719 return symbol_at(klass_slot_at(which).name_index()); 720 } 721 722 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { 723 jint ref_index = klass_ref_index_at(which); 724 return klass_at_noresolve(ref_index); 725 } 726 727 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { 728 jint ref_index = uncached_klass_ref_index_at(which); 729 return klass_at_noresolve(ref_index); 730 } 731 732 char* ConstantPool::string_at_noresolve(int which) { 733 return unresolved_string_at(which)->as_C_string(); 734 } 735 736 BasicType ConstantPool::basic_type_for_signature_at(int which) const { 737 return FieldType::basic_type(symbol_at(which)); 738 } 739 740 741 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) { 742 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused 743 if (this_cp->tag_at(index).is_string()) { 744 this_cp->string_at(index, CHECK); 745 } 746 } 747 } 748 749 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) { 750 // Dig out the detailed message to reuse if possible 751 Symbol* message = java_lang_Throwable::detail_message(pending_exception); 752 if (message != NULL) { 753 return message; 754 } 755 756 // Return specific message for the tag 757 switch (tag.value()) { 758 case JVM_CONSTANT_UnresolvedClass: 759 case JVM_CONSTANT_UnresolvedValue: 760 // return the class name in the error message 761 message = this_cp->klass_name_at(which); 762 break; 763 case JVM_CONSTANT_MethodHandle: 764 // return the method handle name in the error message 765 message = this_cp->method_handle_name_ref_at(which); 766 break; 767 case JVM_CONSTANT_MethodType: 768 // return the method type signature in the error message 769 message = this_cp->method_type_signature_at(which); 770 break; 771 default: 772 ShouldNotReachHere(); 773 } 774 775 return message; 776 } 777 778 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) { 779 Symbol* message = NULL; 780 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message); 781 assert(error != NULL && message != NULL, "checking"); 782 CLEAR_PENDING_EXCEPTION; 783 ResourceMark rm; 784 THROW_MSG(error, message->as_C_string()); 785 } 786 787 // If resolution for Class, Dynamic constant, MethodHandle or MethodType fails, save the 788 // exception in the resolution error table, so that the same exception is thrown again. 789 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which, 790 constantTag tag, TRAPS) { 791 Symbol* error = PENDING_EXCEPTION->klass()->name(); 792 793 int error_tag = tag.error_value(); 794 795 if (!PENDING_EXCEPTION-> 796 is_a(SystemDictionary::LinkageError_klass())) { 797 // Just throw the exception and don't prevent these classes from 798 // being loaded due to virtual machine errors like StackOverflow 799 // and OutOfMemoryError, etc, or if the thread was hit by stop() 800 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 801 } else if (this_cp->tag_at(which).value() != error_tag) { 802 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION); 803 SystemDictionary::add_resolution_error(this_cp, which, error, message); 804 // CAS in the tag. If a thread beat us to registering this error that's fine. 805 // If another thread resolved the reference, this is a race condition. This 806 // thread may have had a security manager or something temporary. 807 // This doesn't deterministically get an error. So why do we save this? 808 // We save this because jvmti can add classes to the bootclass path after 809 // this error, so it needs to get the same error if the error is first. 810 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag, 811 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value()); 812 if (old_tag != error_tag && old_tag != tag.value()) { 813 // MethodHandles and MethodType doesn't change to resolved version. 814 assert(this_cp->tag_at(which).is_klass() || this_cp->tag_at(which).is_value_type(), "Wrong tag value"); 815 // Forget the exception and use the resolved class. 816 CLEAR_PENDING_EXCEPTION; 817 } 818 } else { 819 // some other thread put this in error state 820 throw_resolution_error(this_cp, which, CHECK); 821 } 822 } 823 824 BasicType ConstantPool::basic_type_for_constant_at(int which) { 825 constantTag tag = tag_at(which); 826 if (tag.is_dynamic_constant() || 827 tag.is_dynamic_constant_in_error()) { 828 // have to look at the signature for this one 829 Symbol* constant_type = uncached_signature_ref_at(which); 830 return FieldType::basic_type(constant_type); 831 } 832 return tag.basic_type(); 833 } 834 835 // Called to resolve constants in the constant pool and return an oop. 836 // Some constant pool entries cache their resolved oop. This is also 837 // called to create oops from constants to use in arguments for invokedynamic 838 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, 839 int index, int cache_index, 840 bool* status_return, TRAPS) { 841 oop result_oop = NULL; 842 Handle throw_exception; 843 844 if (cache_index == _possible_index_sentinel) { 845 // It is possible that this constant is one which is cached in the objects. 846 // We'll do a linear search. This should be OK because this usage is rare. 847 // FIXME: If bootstrap specifiers stress this code, consider putting in 848 // a reverse index. Binary search over a short array should do it. 849 assert(index > 0, "valid index"); 850 cache_index = this_cp->cp_to_object_index(index); 851 } 852 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); 853 assert(index == _no_index_sentinel || index >= 0, ""); 854 855 if (cache_index >= 0) { 856 result_oop = this_cp->resolved_references()->obj_at(cache_index); 857 if (result_oop != NULL) { 858 if (result_oop == Universe::the_null_sentinel()) { 859 DEBUG_ONLY(int temp_index = (index >= 0 ? index : this_cp->object_to_cp_index(cache_index))); 860 assert(this_cp->tag_at(temp_index).is_dynamic_constant(), "only condy uses the null sentinel"); 861 result_oop = NULL; 862 } 863 if (status_return != NULL) (*status_return) = true; 864 return result_oop; 865 // That was easy... 866 } 867 index = this_cp->object_to_cp_index(cache_index); 868 } 869 870 jvalue prim_value; // temp used only in a few cases below 871 872 constantTag tag = this_cp->tag_at(index); 873 874 if (status_return != NULL) { 875 // don't trigger resolution if the constant might need it 876 switch (tag.value()) { 877 case JVM_CONSTANT_Class: 878 { 879 CPKlassSlot kslot = this_cp->klass_slot_at(index); 880 int resolved_klass_index = kslot.resolved_klass_index(); 881 if (this_cp->resolved_klasses()->at(resolved_klass_index) == NULL) { 882 (*status_return) = false; 883 return NULL; 884 } 885 // the klass is waiting in the CP; go get it 886 break; 887 } 888 case JVM_CONSTANT_String: 889 case JVM_CONSTANT_Integer: 890 case JVM_CONSTANT_Float: 891 case JVM_CONSTANT_Long: 892 case JVM_CONSTANT_Double: 893 // these guys trigger OOM at worst 894 break; 895 default: 896 (*status_return) = false; 897 return NULL; 898 } 899 // from now on there is either success or an OOME 900 (*status_return) = true; 901 } 902 903 switch (tag.value()) { 904 905 case JVM_CONSTANT_UnresolvedClass: 906 case JVM_CONSTANT_UnresolvedClassInError: 907 case JVM_CONSTANT_Class: 908 case JVM_CONSTANT_UnresolvedValue: 909 case JVM_CONSTANT_UnresolvedValueInError: 910 case JVM_CONSTANT_Value: 911 { 912 assert(cache_index == _no_index_sentinel, "should not have been set"); 913 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL); 914 // ldc wants the java mirror. 915 result_oop = resolved->java_mirror(); 916 break; 917 } 918 919 case JVM_CONSTANT_Dynamic: 920 { 921 Klass* current_klass = this_cp->pool_holder(); 922 Symbol* constant_name = this_cp->uncached_name_ref_at(index); 923 Symbol* constant_type = this_cp->uncached_signature_ref_at(index); 924 925 // The initial step in resolving an unresolved symbolic reference to a 926 // dynamically-computed constant is to resolve the symbolic reference to a 927 // method handle which will be the bootstrap method for the dynamically-computed 928 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap 929 // method fails, then a MethodHandleInError is stored at the corresponding 930 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to 931 // set a DynamicConstantInError here since any subsequent use of this 932 // bootstrap method will encounter the resolution of MethodHandleInError. 933 oop bsm_info = this_cp->resolve_bootstrap_specifier_at(index, THREAD); 934 Exceptions::wrap_dynamic_exception(CHECK_NULL); 935 assert(bsm_info != NULL, ""); 936 // FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_Dynamic. 937 Handle bootstrap_specifier = Handle(THREAD, bsm_info); 938 939 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop. 940 Handle value = SystemDictionary::link_dynamic_constant(current_klass, 941 index, 942 bootstrap_specifier, 943 constant_name, 944 constant_type, 945 THREAD); 946 result_oop = value(); 947 Exceptions::wrap_dynamic_exception(THREAD); 948 if (HAS_PENDING_EXCEPTION) { 949 // Resolution failure of the dynamically-computed constant, save_and_throw_exception 950 // will check for a LinkageError and store a DynamicConstantInError. 951 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 952 } 953 BasicType type = FieldType::basic_type(constant_type); 954 if (!is_reference_type(type)) { 955 // Make sure the primitive value is properly boxed. 956 // This is a JDK responsibility. 957 const char* fail = NULL; 958 if (result_oop == NULL) { 959 fail = "null result instead of box"; 960 } else if (!is_java_primitive(type)) { 961 // FIXME: support value types via unboxing 962 fail = "can only handle references and primitives"; 963 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) { 964 fail = "primitive is not properly boxed"; 965 } 966 if (fail != NULL) { 967 // Since this exception is not a LinkageError, throw exception 968 // but do not save a DynamicInError resolution result. 969 // See section 5.4.3 of the VM spec. 970 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail); 971 } 972 } 973 break; 974 } 975 976 case JVM_CONSTANT_String: 977 assert(cache_index != _no_index_sentinel, "should have been set"); 978 if (this_cp->is_pseudo_string_at(index)) { 979 result_oop = this_cp->pseudo_string_at(index, cache_index); 980 break; 981 } 982 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL); 983 break; 984 985 case JVM_CONSTANT_DynamicInError: 986 case JVM_CONSTANT_MethodHandleInError: 987 case JVM_CONSTANT_MethodTypeInError: 988 { 989 throw_resolution_error(this_cp, index, CHECK_NULL); 990 break; 991 } 992 993 case JVM_CONSTANT_MethodHandle: 994 { 995 int ref_kind = this_cp->method_handle_ref_kind_at(index); 996 int callee_index = this_cp->method_handle_klass_index_at(index); 997 Symbol* name = this_cp->method_handle_name_ref_at(index); 998 Symbol* signature = this_cp->method_handle_signature_ref_at(index); 999 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index)); 1000 { ResourceMark rm(THREAD); 1001 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", 1002 ref_kind, index, this_cp->method_handle_index_at(index), 1003 callee_index, name->as_C_string(), signature->as_C_string()); 1004 } 1005 1006 Klass* callee = klass_at_impl(this_cp, callee_index, true, CHECK_NULL); 1007 1008 // Check constant pool method consistency 1009 if ((callee->is_interface() && m_tag.is_method()) || 1010 ((!callee->is_interface() && m_tag.is_interface_method()))) { 1011 ResourceMark rm(THREAD); 1012 char buf[400]; 1013 jio_snprintf(buf, sizeof(buf), 1014 "Inconsistent constant pool data in classfile for class %s. " 1015 "Method %s%s at index %d is %s and should be %s", 1016 callee->name()->as_C_string(), name->as_C_string(), signature->as_C_string(), index, 1017 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef", 1018 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef"); 1019 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 1020 } 1021 1022 Klass* klass = this_cp->pool_holder(); 1023 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, 1024 callee, name, signature, 1025 THREAD); 1026 result_oop = value(); 1027 if (HAS_PENDING_EXCEPTION) { 1028 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 1029 } 1030 break; 1031 } 1032 1033 case JVM_CONSTANT_MethodType: 1034 { 1035 Symbol* signature = this_cp->method_type_signature_at(index); 1036 { ResourceMark rm(THREAD); 1037 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s", 1038 index, this_cp->method_type_index_at(index), 1039 signature->as_C_string()); 1040 } 1041 Klass* klass = this_cp->pool_holder(); 1042 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); 1043 result_oop = value(); 1044 if (HAS_PENDING_EXCEPTION) { 1045 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 1046 } 1047 break; 1048 } 1049 1050 case JVM_CONSTANT_Integer: 1051 assert(cache_index == _no_index_sentinel, "should not have been set"); 1052 prim_value.i = this_cp->int_at(index); 1053 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); 1054 break; 1055 1056 case JVM_CONSTANT_Float: 1057 assert(cache_index == _no_index_sentinel, "should not have been set"); 1058 prim_value.f = this_cp->float_at(index); 1059 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); 1060 break; 1061 1062 case JVM_CONSTANT_Long: 1063 assert(cache_index == _no_index_sentinel, "should not have been set"); 1064 prim_value.j = this_cp->long_at(index); 1065 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); 1066 break; 1067 1068 case JVM_CONSTANT_Double: 1069 assert(cache_index == _no_index_sentinel, "should not have been set"); 1070 prim_value.d = this_cp->double_at(index); 1071 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); 1072 break; 1073 1074 default: 1075 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", 1076 this_cp(), index, cache_index, tag.value())); 1077 assert(false, "unexpected constant tag"); 1078 break; 1079 } 1080 1081 if (cache_index >= 0) { 1082 // Benign race condition: resolved_references may already be filled in. 1083 // The important thing here is that all threads pick up the same result. 1084 // It doesn't matter which racing thread wins, as long as only one 1085 // result is used by all threads, and all future queries. 1086 oop new_result = (result_oop == NULL ? Universe::the_null_sentinel() : result_oop); 1087 oop old_result = this_cp->resolved_references() 1088 ->atomic_compare_exchange_oop(cache_index, new_result, NULL); 1089 if (old_result == NULL) { 1090 return result_oop; // was installed 1091 } else { 1092 // Return the winning thread's result. This can be different than 1093 // the result here for MethodHandles. 1094 if (old_result == Universe::the_null_sentinel()) 1095 old_result = NULL; 1096 return old_result; 1097 } 1098 } else { 1099 assert(result_oop != Universe::the_null_sentinel(), ""); 1100 return result_oop; 1101 } 1102 } 1103 1104 oop ConstantPool::uncached_string_at(int which, TRAPS) { 1105 Symbol* sym = unresolved_string_at(which); 1106 oop str = StringTable::intern(sym, CHECK_(NULL)); 1107 assert(java_lang_String::is_instance(str), "must be string"); 1108 return str; 1109 } 1110 1111 1112 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) { 1113 assert((this_cp->tag_at(index).is_invoke_dynamic() || 1114 this_cp->tag_at(index).is_dynamic_constant()), "Corrupted constant pool"); 1115 Handle bsm; 1116 int argc; 1117 { 1118 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&mtype], plus optional arguments 1119 // JVM_CONSTANT_Dynamic is an ordered pair of [bootm, name&ftype], plus optional arguments 1120 // In both cases, the bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. 1121 // It is accompanied by the optional arguments. 1122 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index); 1123 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); 1124 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { 1125 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); 1126 } 1127 1128 // Extract the optional static arguments. 1129 argc = this_cp->invoke_dynamic_argument_count_at(index); 1130 1131 // if there are no static arguments, return the bsm by itself: 1132 if (argc == 0 && UseBootstrapCallInfo < 2) return bsm_oop; 1133 1134 bsm = Handle(THREAD, bsm_oop); 1135 } 1136 1137 // We are going to return an ordered pair of {bsm, info}, using a 2-array. 1138 objArrayHandle info; 1139 { 1140 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1141 info = objArrayHandle(THREAD, info_oop); 1142 } 1143 1144 info->obj_at_put(0, bsm()); 1145 1146 bool use_BSCI; 1147 switch (UseBootstrapCallInfo) { 1148 default: use_BSCI = true; break; // stress mode 1149 case 0: use_BSCI = false; break; // stress mode 1150 case 1: // normal mode 1151 // If we were to support an alternative mode of BSM invocation, 1152 // we'd convert to pull mode here if the BSM could be a candidate 1153 // for that alternative mode. We can't easily test for things 1154 // like varargs here, but we can get away with approximate testing, 1155 // since the JDK runtime will make up the difference either way. 1156 // For now, exercise the pull-mode path if the BSM is of arity 2, 1157 // or if there is a potential condy loop (see below). 1158 oop mt_oop = java_lang_invoke_MethodHandle::type(bsm()); 1159 use_BSCI = (java_lang_invoke_MethodType::ptype_count(mt_oop) == 2); 1160 break; 1161 } 1162 1163 // Here's a reason to use BSCI even if it wasn't requested: 1164 // If a condy uses a condy argument, we want to avoid infinite 1165 // recursion (condy loops) in the C code. It's OK in Java, 1166 // because Java has stack overflow checking, so we punt 1167 // potentially cyclic cases from C to Java. 1168 if (!use_BSCI && this_cp->tag_at(index).is_dynamic_constant()) { 1169 bool found_unresolved_condy = false; 1170 for (int i = 0; i < argc; i++) { 1171 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i); 1172 if (this_cp->tag_at(arg_index).is_dynamic_constant()) { 1173 // potential recursion point condy -> condy 1174 bool found_it = false; 1175 this_cp->find_cached_constant_at(arg_index, found_it, CHECK_NULL); 1176 if (!found_it) { found_unresolved_condy = true; break; } 1177 } 1178 } 1179 if (found_unresolved_condy) 1180 use_BSCI = true; 1181 } 1182 1183 const int SMALL_ARITY = 5; 1184 if (use_BSCI && argc <= SMALL_ARITY && UseBootstrapCallInfo <= 2) { 1185 // If there are only a few arguments, and none of them need linking, 1186 // push them, instead of asking the JDK runtime to turn around and 1187 // pull them, saving a JVM/JDK transition in some simple cases. 1188 bool all_resolved = true; 1189 for (int i = 0; i < argc; i++) { 1190 bool found_it = false; 1191 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i); 1192 this_cp->find_cached_constant_at(arg_index, found_it, CHECK_NULL); 1193 if (!found_it) { all_resolved = false; break; } 1194 } 1195 if (all_resolved) 1196 use_BSCI = false; 1197 } 1198 1199 if (!use_BSCI) { 1200 // return {bsm, {arg...}}; resolution of arguments is done immediately, before JDK code is called 1201 objArrayOop args_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), argc, CHECK_NULL); 1202 info->obj_at_put(1, args_oop); // may overwrite with args[0] below 1203 objArrayHandle args(THREAD, args_oop); 1204 copy_bootstrap_arguments_at_impl(this_cp, index, 0, argc, args, 0, true, Handle(), CHECK_NULL); 1205 if (argc == 1) { 1206 // try to discard the singleton array 1207 oop arg_oop = args->obj_at(0); 1208 if (arg_oop != NULL && !arg_oop->is_array()) { 1209 // JVM treats arrays and nulls specially in this position, 1210 // but other things are just single arguments 1211 info->obj_at_put(1, arg_oop); 1212 } 1213 } 1214 } else { 1215 // return {bsm, {arg_count, pool_index}}; JDK code must pull the arguments as needed 1216 typeArrayOop ints_oop = oopFactory::new_typeArray(T_INT, 2, CHECK_NULL); 1217 ints_oop->int_at_put(0, argc); 1218 ints_oop->int_at_put(1, index); 1219 info->obj_at_put(1, ints_oop); 1220 } 1221 return info(); 1222 } 1223 1224 void ConstantPool::copy_bootstrap_arguments_at_impl(const constantPoolHandle& this_cp, int index, 1225 int start_arg, int end_arg, 1226 objArrayHandle info, int pos, 1227 bool must_resolve, Handle if_not_available, 1228 TRAPS) { 1229 int argc; 1230 int limit = pos + end_arg - start_arg; 1231 // checks: index in range [0..this_cp->length), 1232 // tag at index, start..end in range [0..argc], 1233 // info array non-null, pos..limit in [0..info.length] 1234 if ((0 >= index || index >= this_cp->length()) || 1235 !(this_cp->tag_at(index).is_invoke_dynamic() || 1236 this_cp->tag_at(index).is_dynamic_constant()) || 1237 (0 > start_arg || start_arg > end_arg) || 1238 (end_arg > (argc = this_cp->invoke_dynamic_argument_count_at(index))) || 1239 (0 > pos || pos > limit) || 1240 (info.is_null() || limit > info->length())) { 1241 // An index or something else went wrong; throw an error. 1242 // Since this is an internal API, we don't expect this, 1243 // so we don't bother to craft a nice message. 1244 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access"); 1245 } 1246 // now we can loop safely 1247 int info_i = pos; 1248 for (int i = start_arg; i < end_arg; i++) { 1249 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i); 1250 oop arg_oop; 1251 if (must_resolve) { 1252 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK); 1253 } else { 1254 bool found_it = false; 1255 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK); 1256 if (!found_it) arg_oop = if_not_available(); 1257 } 1258 info->obj_at_put(info_i++, arg_oop); 1259 } 1260 } 1261 1262 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) { 1263 // If the string has already been interned, this entry will be non-null 1264 oop str = this_cp->resolved_references()->obj_at(obj_index); 1265 assert(str != Universe::the_null_sentinel(), ""); 1266 if (str != NULL) return str; 1267 Symbol* sym = this_cp->unresolved_string_at(which); 1268 str = StringTable::intern(sym, CHECK_(NULL)); 1269 this_cp->string_at_put(which, obj_index, str); 1270 assert(java_lang_String::is_instance(str), "must be string"); 1271 return str; 1272 } 1273 1274 1275 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) { 1276 // Names are interned, so we can compare Symbol*s directly 1277 Symbol* cp_name = klass_name_at(which); 1278 return (cp_name == k->name()); 1279 } 1280 1281 1282 // Iterate over symbols and decrement ones which are Symbol*s 1283 // This is done during GC. 1284 // Only decrement the UTF8 symbols. Strings point to 1285 // these symbols but didn't increment the reference count. 1286 void ConstantPool::unreference_symbols() { 1287 for (int index = 1; index < length(); index++) { // Index 0 is unused 1288 constantTag tag = tag_at(index); 1289 if (tag.is_symbol()) { 1290 symbol_at(index)->decrement_refcount(); 1291 } 1292 } 1293 } 1294 1295 1296 // Compare this constant pool's entry at index1 to the constant pool 1297 // cp2's entry at index2. 1298 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2, 1299 int index2, TRAPS) { 1300 1301 // The error tags are equivalent to non-error tags when comparing 1302 jbyte t1 = tag_at(index1).non_error_value(); 1303 jbyte t2 = cp2->tag_at(index2).non_error_value(); 1304 1305 if (t1 != t2) { 1306 // Not the same entry type so there is nothing else to check. Note 1307 // that this style of checking will consider resolved/unresolved 1308 // class pairs as different. 1309 // From the ConstantPool* API point of view, this is correct 1310 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this 1311 // plays out in the context of ConstantPool* merging. 1312 return false; 1313 } 1314 1315 switch (t1) { 1316 case JVM_CONSTANT_Class: 1317 case JVM_CONSTANT_Value: 1318 { 1319 Klass* k1 = klass_at(index1, CHECK_false); 1320 Klass* k2 = cp2->klass_at(index2, CHECK_false); 1321 if (k1 == k2) { 1322 return true; 1323 } 1324 } break; 1325 1326 case JVM_CONSTANT_ClassIndex: 1327 { 1328 int recur1 = klass_index_at(index1); 1329 int recur2 = cp2->klass_index_at(index2); 1330 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1331 if (match) { 1332 return true; 1333 } 1334 } break; 1335 1336 case JVM_CONSTANT_ValueIndex: 1337 { 1338 int recur1 = value_type_index_at(index1); 1339 int recur2 = cp2->value_type_index_at(index2); 1340 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1341 if (match) { 1342 return true; 1343 } 1344 } break; 1345 1346 case JVM_CONSTANT_Double: 1347 { 1348 jdouble d1 = double_at(index1); 1349 jdouble d2 = cp2->double_at(index2); 1350 if (d1 == d2) { 1351 return true; 1352 } 1353 } break; 1354 1355 case JVM_CONSTANT_Fieldref: 1356 case JVM_CONSTANT_InterfaceMethodref: 1357 case JVM_CONSTANT_Methodref: 1358 { 1359 int recur1 = uncached_klass_ref_index_at(index1); 1360 int recur2 = cp2->uncached_klass_ref_index_at(index2); 1361 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1362 if (match) { 1363 recur1 = uncached_name_and_type_ref_index_at(index1); 1364 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); 1365 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1366 if (match) { 1367 return true; 1368 } 1369 } 1370 } break; 1371 1372 case JVM_CONSTANT_Float: 1373 { 1374 jfloat f1 = float_at(index1); 1375 jfloat f2 = cp2->float_at(index2); 1376 if (f1 == f2) { 1377 return true; 1378 } 1379 } break; 1380 1381 case JVM_CONSTANT_Integer: 1382 { 1383 jint i1 = int_at(index1); 1384 jint i2 = cp2->int_at(index2); 1385 if (i1 == i2) { 1386 return true; 1387 } 1388 } break; 1389 1390 case JVM_CONSTANT_Long: 1391 { 1392 jlong l1 = long_at(index1); 1393 jlong l2 = cp2->long_at(index2); 1394 if (l1 == l2) { 1395 return true; 1396 } 1397 } break; 1398 1399 case JVM_CONSTANT_NameAndType: 1400 { 1401 int recur1 = name_ref_index_at(index1); 1402 int recur2 = cp2->name_ref_index_at(index2); 1403 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1404 if (match) { 1405 recur1 = signature_ref_index_at(index1); 1406 recur2 = cp2->signature_ref_index_at(index2); 1407 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1408 if (match) { 1409 return true; 1410 } 1411 } 1412 } break; 1413 1414 case JVM_CONSTANT_StringIndex: 1415 { 1416 int recur1 = string_index_at(index1); 1417 int recur2 = cp2->string_index_at(index2); 1418 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1419 if (match) { 1420 return true; 1421 } 1422 } break; 1423 1424 case JVM_CONSTANT_UnresolvedClass: 1425 case JVM_CONSTANT_UnresolvedValue: 1426 { 1427 Symbol* k1 = klass_name_at(index1); 1428 Symbol* k2 = cp2->klass_name_at(index2); 1429 if (k1 == k2) { 1430 return true; 1431 } 1432 } break; 1433 1434 case JVM_CONSTANT_MethodType: 1435 { 1436 int k1 = method_type_index_at(index1); 1437 int k2 = cp2->method_type_index_at(index2); 1438 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1439 if (match) { 1440 return true; 1441 } 1442 } break; 1443 1444 case JVM_CONSTANT_MethodHandle: 1445 { 1446 int k1 = method_handle_ref_kind_at(index1); 1447 int k2 = cp2->method_handle_ref_kind_at(index2); 1448 if (k1 == k2) { 1449 int i1 = method_handle_index_at(index1); 1450 int i2 = cp2->method_handle_index_at(index2); 1451 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); 1452 if (match) { 1453 return true; 1454 } 1455 } 1456 } break; 1457 1458 case JVM_CONSTANT_Dynamic: 1459 { 1460 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); 1461 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); 1462 int i1 = invoke_dynamic_bootstrap_specifier_index(index1); 1463 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); 1464 // separate statements and variables because CHECK_false is used 1465 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); 1466 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); 1467 return (match_entry && match_operand); 1468 } break; 1469 1470 case JVM_CONSTANT_InvokeDynamic: 1471 { 1472 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); 1473 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); 1474 int i1 = invoke_dynamic_bootstrap_specifier_index(index1); 1475 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); 1476 // separate statements and variables because CHECK_false is used 1477 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); 1478 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); 1479 return (match_entry && match_operand); 1480 } break; 1481 1482 case JVM_CONSTANT_String: 1483 { 1484 Symbol* s1 = unresolved_string_at(index1); 1485 Symbol* s2 = cp2->unresolved_string_at(index2); 1486 if (s1 == s2) { 1487 return true; 1488 } 1489 } break; 1490 1491 case JVM_CONSTANT_Utf8: 1492 { 1493 Symbol* s1 = symbol_at(index1); 1494 Symbol* s2 = cp2->symbol_at(index2); 1495 if (s1 == s2) { 1496 return true; 1497 } 1498 } break; 1499 1500 // Invalid is used as the tag for the second constant pool entry 1501 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1502 // not be seen by itself. 1503 case JVM_CONSTANT_Invalid: // fall through 1504 1505 default: 1506 ShouldNotReachHere(); 1507 break; 1508 } 1509 1510 return false; 1511 } // end compare_entry_to() 1512 1513 1514 // Resize the operands array with delta_len and delta_size. 1515 // Used in RedefineClasses for CP merge. 1516 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { 1517 int old_len = operand_array_length(operands()); 1518 int new_len = old_len + delta_len; 1519 int min_len = (delta_len > 0) ? old_len : new_len; 1520 1521 int old_size = operands()->length(); 1522 int new_size = old_size + delta_size; 1523 int min_size = (delta_size > 0) ? old_size : new_size; 1524 1525 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1526 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); 1527 1528 // Set index in the resized array for existing elements only 1529 for (int idx = 0; idx < min_len; idx++) { 1530 int offset = operand_offset_at(idx); // offset in original array 1531 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array 1532 } 1533 // Copy the bootstrap specifiers only 1534 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), 1535 new_ops->adr_at(2*new_len), 1536 (min_size - 2*min_len) * sizeof(u2)); 1537 // Explicitly deallocate old operands array. 1538 // Note, it is not needed for 7u backport. 1539 if ( operands() != NULL) { // the safety check 1540 MetadataFactory::free_array<u2>(loader_data, operands()); 1541 } 1542 set_operands(new_ops); 1543 } // end resize_operands() 1544 1545 1546 // Extend the operands array with the length and size of the ext_cp operands. 1547 // Used in RedefineClasses for CP merge. 1548 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) { 1549 int delta_len = operand_array_length(ext_cp->operands()); 1550 if (delta_len == 0) { 1551 return; // nothing to do 1552 } 1553 int delta_size = ext_cp->operands()->length(); 1554 1555 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); 1556 1557 if (operand_array_length(operands()) == 0) { 1558 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1559 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); 1560 // The first element index defines the offset of second part 1561 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array 1562 set_operands(new_ops); 1563 } else { 1564 resize_operands(delta_len, delta_size, CHECK); 1565 } 1566 1567 } // end extend_operands() 1568 1569 1570 // Shrink the operands array to a smaller array with new_len length. 1571 // Used in RedefineClasses for CP merge. 1572 void ConstantPool::shrink_operands(int new_len, TRAPS) { 1573 int old_len = operand_array_length(operands()); 1574 if (new_len == old_len) { 1575 return; // nothing to do 1576 } 1577 assert(new_len < old_len, "shrunken operands array must be smaller"); 1578 1579 int free_base = operand_next_offset_at(new_len - 1); 1580 int delta_len = new_len - old_len; 1581 int delta_size = 2*delta_len + free_base - operands()->length(); 1582 1583 resize_operands(delta_len, delta_size, CHECK); 1584 1585 } // end shrink_operands() 1586 1587 1588 void ConstantPool::copy_operands(const constantPoolHandle& from_cp, 1589 const constantPoolHandle& to_cp, 1590 TRAPS) { 1591 1592 int from_oplen = operand_array_length(from_cp->operands()); 1593 int old_oplen = operand_array_length(to_cp->operands()); 1594 if (from_oplen != 0) { 1595 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); 1596 // append my operands to the target's operands array 1597 if (old_oplen == 0) { 1598 // Can't just reuse from_cp's operand list because of deallocation issues 1599 int len = from_cp->operands()->length(); 1600 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); 1601 Copy::conjoint_memory_atomic( 1602 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); 1603 to_cp->set_operands(new_ops); 1604 } else { 1605 int old_len = to_cp->operands()->length(); 1606 int from_len = from_cp->operands()->length(); 1607 int old_off = old_oplen * sizeof(u2); 1608 int from_off = from_oplen * sizeof(u2); 1609 // Use the metaspace for the destination constant pool 1610 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); 1611 int fillp = 0, len = 0; 1612 // first part of dest 1613 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), 1614 new_operands->adr_at(fillp), 1615 (len = old_off) * sizeof(u2)); 1616 fillp += len; 1617 // first part of src 1618 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), 1619 new_operands->adr_at(fillp), 1620 (len = from_off) * sizeof(u2)); 1621 fillp += len; 1622 // second part of dest 1623 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), 1624 new_operands->adr_at(fillp), 1625 (len = old_len - old_off) * sizeof(u2)); 1626 fillp += len; 1627 // second part of src 1628 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), 1629 new_operands->adr_at(fillp), 1630 (len = from_len - from_off) * sizeof(u2)); 1631 fillp += len; 1632 assert(fillp == new_operands->length(), ""); 1633 1634 // Adjust indexes in the first part of the copied operands array. 1635 for (int j = 0; j < from_oplen; j++) { 1636 int offset = operand_offset_at(new_operands, old_oplen + j); 1637 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); 1638 offset += old_len; // every new tuple is preceded by old_len extra u2's 1639 operand_offset_at_put(new_operands, old_oplen + j, offset); 1640 } 1641 1642 // replace target operands array with combined array 1643 to_cp->set_operands(new_operands); 1644 } 1645 } 1646 } // end copy_operands() 1647 1648 1649 // Copy this constant pool's entries at start_i to end_i (inclusive) 1650 // to the constant pool to_cp's entries starting at to_i. A total of 1651 // (end_i - start_i) + 1 entries are copied. 1652 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i, 1653 const constantPoolHandle& to_cp, int to_i, TRAPS) { 1654 1655 1656 int dest_i = to_i; // leave original alone for debug purposes 1657 1658 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { 1659 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); 1660 1661 switch (from_cp->tag_at(src_i).value()) { 1662 case JVM_CONSTANT_Double: 1663 case JVM_CONSTANT_Long: 1664 // double and long take two constant pool entries 1665 src_i += 2; 1666 dest_i += 2; 1667 break; 1668 1669 default: 1670 // all others take one constant pool entry 1671 src_i++; 1672 dest_i++; 1673 break; 1674 } 1675 } 1676 copy_operands(from_cp, to_cp, CHECK); 1677 1678 } // end copy_cp_to_impl() 1679 1680 1681 // Copy this constant pool's entry at from_i to the constant pool 1682 // to_cp's entry at to_i. 1683 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i, 1684 const constantPoolHandle& to_cp, int to_i, 1685 TRAPS) { 1686 1687 int tag = from_cp->tag_at(from_i).value(); 1688 switch (tag) { 1689 case JVM_CONSTANT_ClassIndex: 1690 { 1691 jint ki = from_cp->klass_index_at(from_i); 1692 to_cp->klass_index_at_put(to_i, ki); 1693 } break; 1694 1695 case JVM_CONSTANT_ValueIndex: 1696 { 1697 jint ki = from_cp->klass_index_at(from_i); 1698 to_cp->klass_index_at_put(to_i, ki); 1699 } break; 1700 1701 case JVM_CONSTANT_Double: 1702 { 1703 jdouble d = from_cp->double_at(from_i); 1704 to_cp->double_at_put(to_i, d); 1705 // double takes two constant pool entries so init second entry's tag 1706 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1707 } break; 1708 1709 case JVM_CONSTANT_Fieldref: 1710 { 1711 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1712 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1713 to_cp->field_at_put(to_i, class_index, name_and_type_index); 1714 } break; 1715 1716 case JVM_CONSTANT_Float: 1717 { 1718 jfloat f = from_cp->float_at(from_i); 1719 to_cp->float_at_put(to_i, f); 1720 } break; 1721 1722 case JVM_CONSTANT_Integer: 1723 { 1724 jint i = from_cp->int_at(from_i); 1725 to_cp->int_at_put(to_i, i); 1726 } break; 1727 1728 case JVM_CONSTANT_InterfaceMethodref: 1729 { 1730 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1731 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1732 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); 1733 } break; 1734 1735 case JVM_CONSTANT_Long: 1736 { 1737 jlong l = from_cp->long_at(from_i); 1738 to_cp->long_at_put(to_i, l); 1739 // long takes two constant pool entries so init second entry's tag 1740 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1741 } break; 1742 1743 case JVM_CONSTANT_Methodref: 1744 { 1745 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1746 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1747 to_cp->method_at_put(to_i, class_index, name_and_type_index); 1748 } break; 1749 1750 case JVM_CONSTANT_NameAndType: 1751 { 1752 int name_ref_index = from_cp->name_ref_index_at(from_i); 1753 int signature_ref_index = from_cp->signature_ref_index_at(from_i); 1754 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); 1755 } break; 1756 1757 case JVM_CONSTANT_StringIndex: 1758 { 1759 jint si = from_cp->string_index_at(from_i); 1760 to_cp->string_index_at_put(to_i, si); 1761 } break; 1762 1763 case JVM_CONSTANT_Class: 1764 case JVM_CONSTANT_UnresolvedClass: 1765 case JVM_CONSTANT_UnresolvedClassInError: 1766 { 1767 // Revert to JVM_CONSTANT_ClassIndex 1768 int name_index = from_cp->klass_slot_at(from_i).name_index(); 1769 assert(from_cp->tag_at(name_index).is_symbol(), "sanity"); 1770 to_cp->klass_index_at_put(to_i, name_index); 1771 } break; 1772 1773 case JVM_CONSTANT_Value: 1774 case JVM_CONSTANT_UnresolvedValue: 1775 case JVM_CONSTANT_UnresolvedValueInError: 1776 { 1777 // Revert to JVM_CONSTANT_ValueIndex 1778 int name_index = from_cp->klass_slot_at(from_i).name_index(); 1779 assert(from_cp->tag_at(name_index).is_symbol(), "sanity"); 1780 to_cp->value_type_index_at_put(to_i, name_index); 1781 } break; 1782 1783 case JVM_CONSTANT_String: 1784 { 1785 Symbol* s = from_cp->unresolved_string_at(from_i); 1786 to_cp->unresolved_string_at_put(to_i, s); 1787 } break; 1788 1789 case JVM_CONSTANT_Utf8: 1790 { 1791 Symbol* s = from_cp->symbol_at(from_i); 1792 // Need to increase refcount, the old one will be thrown away and deferenced 1793 s->increment_refcount(); 1794 to_cp->symbol_at_put(to_i, s); 1795 } break; 1796 1797 case JVM_CONSTANT_MethodType: 1798 case JVM_CONSTANT_MethodTypeInError: 1799 { 1800 jint k = from_cp->method_type_index_at(from_i); 1801 to_cp->method_type_index_at_put(to_i, k); 1802 } break; 1803 1804 case JVM_CONSTANT_MethodHandle: 1805 case JVM_CONSTANT_MethodHandleInError: 1806 { 1807 int k1 = from_cp->method_handle_ref_kind_at(from_i); 1808 int k2 = from_cp->method_handle_index_at(from_i); 1809 to_cp->method_handle_index_at_put(to_i, k1, k2); 1810 } break; 1811 1812 case JVM_CONSTANT_Dynamic: 1813 case JVM_CONSTANT_DynamicInError: 1814 { 1815 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); 1816 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); 1817 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1818 to_cp->dynamic_constant_at_put(to_i, k1, k2); 1819 } break; 1820 1821 case JVM_CONSTANT_InvokeDynamic: 1822 { 1823 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); 1824 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); 1825 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1826 to_cp->invoke_dynamic_at_put(to_i, k1, k2); 1827 } break; 1828 1829 // Invalid is used as the tag for the second constant pool entry 1830 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1831 // not be seen by itself. 1832 case JVM_CONSTANT_Invalid: // fall through 1833 1834 default: 1835 { 1836 ShouldNotReachHere(); 1837 } break; 1838 } 1839 } // end copy_entry_to() 1840 1841 // Search constant pool search_cp for an entry that matches this 1842 // constant pool's entry at pattern_i. Returns the index of a 1843 // matching entry or zero (0) if there is no matching entry. 1844 int ConstantPool::find_matching_entry(int pattern_i, 1845 const constantPoolHandle& search_cp, TRAPS) { 1846 1847 // index zero (0) is not used 1848 for (int i = 1; i < search_cp->length(); i++) { 1849 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); 1850 if (found) { 1851 return i; 1852 } 1853 } 1854 1855 return 0; // entry not found; return unused index zero (0) 1856 } // end find_matching_entry() 1857 1858 1859 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool 1860 // cp2's bootstrap specifier at idx2. 1861 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) { 1862 int k1 = operand_bootstrap_method_ref_index_at(idx1); 1863 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); 1864 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1865 1866 if (!match) { 1867 return false; 1868 } 1869 int argc = operand_argument_count_at(idx1); 1870 if (argc == cp2->operand_argument_count_at(idx2)) { 1871 for (int j = 0; j < argc; j++) { 1872 k1 = operand_argument_index_at(idx1, j); 1873 k2 = cp2->operand_argument_index_at(idx2, j); 1874 match = compare_entry_to(k1, cp2, k2, CHECK_false); 1875 if (!match) { 1876 return false; 1877 } 1878 } 1879 return true; // got through loop; all elements equal 1880 } 1881 return false; 1882 } // end compare_operand_to() 1883 1884 // Search constant pool search_cp for a bootstrap specifier that matches 1885 // this constant pool's bootstrap specifier at pattern_i index. 1886 // Return the index of a matching bootstrap specifier or (-1) if there is no match. 1887 int ConstantPool::find_matching_operand(int pattern_i, 1888 const constantPoolHandle& search_cp, int search_len, TRAPS) { 1889 for (int i = 0; i < search_len; i++) { 1890 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); 1891 if (found) { 1892 return i; 1893 } 1894 } 1895 return -1; // bootstrap specifier not found; return unused index (-1) 1896 } // end find_matching_operand() 1897 1898 1899 #ifndef PRODUCT 1900 1901 const char* ConstantPool::printable_name_at(int which) { 1902 1903 constantTag tag = tag_at(which); 1904 1905 if (tag.is_string()) { 1906 return string_at_noresolve(which); 1907 } else if (tag.is_klass() || tag.is_unresolved_klass() || 1908 tag.is_value_type() || tag.is_unresolved_value_type()) { 1909 return klass_name_at(which)->as_C_string(); 1910 } else if (tag.is_symbol()) { 1911 return symbol_at(which)->as_C_string(); 1912 } 1913 return ""; 1914 } 1915 1916 #endif // PRODUCT 1917 1918 1919 // JVMTI GetConstantPool support 1920 1921 // For debugging of constant pool 1922 const bool debug_cpool = false; 1923 1924 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) 1925 1926 static void print_cpool_bytes(jint cnt, u1 *bytes) { 1927 const char* WARN_MSG = "Must not be such entry!"; 1928 jint size = 0; 1929 u2 idx1, idx2; 1930 1931 for (jint idx = 1; idx < cnt; idx++) { 1932 jint ent_size = 0; 1933 u1 tag = *bytes++; 1934 size++; // count tag 1935 1936 printf("const #%03d, tag: %02d ", idx, tag); 1937 switch(tag) { 1938 case JVM_CONSTANT_Invalid: { 1939 printf("Invalid"); 1940 break; 1941 } 1942 case JVM_CONSTANT_Unicode: { 1943 printf("Unicode %s", WARN_MSG); 1944 break; 1945 } 1946 case JVM_CONSTANT_Utf8: { 1947 u2 len = Bytes::get_Java_u2(bytes); 1948 char str[128]; 1949 if (len > 127) { 1950 len = 127; 1951 } 1952 strncpy(str, (char *) (bytes+2), len); 1953 str[len] = '\0'; 1954 printf("Utf8 \"%s\"", str); 1955 ent_size = 2 + len; 1956 break; 1957 } 1958 case JVM_CONSTANT_Integer: { 1959 u4 val = Bytes::get_Java_u4(bytes); 1960 printf("int %d", *(int *) &val); 1961 ent_size = 4; 1962 break; 1963 } 1964 case JVM_CONSTANT_Float: { 1965 u4 val = Bytes::get_Java_u4(bytes); 1966 printf("float %5.3ff", *(float *) &val); 1967 ent_size = 4; 1968 break; 1969 } 1970 case JVM_CONSTANT_Long: { 1971 u8 val = Bytes::get_Java_u8(bytes); 1972 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val); 1973 ent_size = 8; 1974 idx++; // Long takes two cpool slots 1975 break; 1976 } 1977 case JVM_CONSTANT_Double: { 1978 u8 val = Bytes::get_Java_u8(bytes); 1979 printf("double %5.3fd", *(jdouble *)&val); 1980 ent_size = 8; 1981 idx++; // Double takes two cpool slots 1982 break; 1983 } 1984 case JVM_CONSTANT_Class: { 1985 idx1 = Bytes::get_Java_u2(bytes); 1986 printf("class #%03d", idx1); 1987 ent_size = 2; 1988 break; 1989 } 1990 case JVM_CONSTANT_Value: { 1991 idx1 = Bytes::get_Java_u2(bytes); 1992 printf("class #%03d", idx1); 1993 ent_size = 2; 1994 break; 1995 } 1996 case JVM_CONSTANT_String: { 1997 idx1 = Bytes::get_Java_u2(bytes); 1998 printf("String #%03d", idx1); 1999 ent_size = 2; 2000 break; 2001 } 2002 case JVM_CONSTANT_Fieldref: { 2003 idx1 = Bytes::get_Java_u2(bytes); 2004 idx2 = Bytes::get_Java_u2(bytes+2); 2005 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); 2006 ent_size = 4; 2007 break; 2008 } 2009 case JVM_CONSTANT_Methodref: { 2010 idx1 = Bytes::get_Java_u2(bytes); 2011 idx2 = Bytes::get_Java_u2(bytes+2); 2012 printf("Method #%03d, #%03d", idx1, idx2); 2013 ent_size = 4; 2014 break; 2015 } 2016 case JVM_CONSTANT_InterfaceMethodref: { 2017 idx1 = Bytes::get_Java_u2(bytes); 2018 idx2 = Bytes::get_Java_u2(bytes+2); 2019 printf("InterfMethod #%03d, #%03d", idx1, idx2); 2020 ent_size = 4; 2021 break; 2022 } 2023 case JVM_CONSTANT_NameAndType: { 2024 idx1 = Bytes::get_Java_u2(bytes); 2025 idx2 = Bytes::get_Java_u2(bytes+2); 2026 printf("NameAndType #%03d, #%03d", idx1, idx2); 2027 ent_size = 4; 2028 break; 2029 } 2030 case JVM_CONSTANT_ClassIndex: { 2031 printf("ClassIndex %s", WARN_MSG); 2032 break; 2033 } 2034 case JVM_CONSTANT_UnresolvedClass: { 2035 printf("UnresolvedClass: %s", WARN_MSG); 2036 break; 2037 } 2038 case JVM_CONSTANT_UnresolvedClassInError: { 2039 printf("UnresolvedClassInErr: %s", WARN_MSG); 2040 break; 2041 } 2042 case JVM_CONSTANT_ValueIndex: { 2043 printf("ValueIndex %s", WARN_MSG); 2044 break; 2045 } 2046 case JVM_CONSTANT_UnresolvedValue: { 2047 printf("UnresolvedValue: %s", WARN_MSG); 2048 break; 2049 } 2050 case JVM_CONSTANT_UnresolvedValueInError: { 2051 printf("UnresolvedValueInErr: %s", WARN_MSG); 2052 break; 2053 } 2054 case JVM_CONSTANT_StringIndex: { 2055 printf("StringIndex: %s", WARN_MSG); 2056 break; 2057 } 2058 } 2059 printf(";\n"); 2060 bytes += ent_size; 2061 size += ent_size; 2062 } 2063 printf("Cpool size: %d\n", size); 2064 fflush(0); 2065 return; 2066 } /* end print_cpool_bytes */ 2067 2068 2069 // Returns size of constant pool entry. 2070 jint ConstantPool::cpool_entry_size(jint idx) { 2071 switch(tag_at(idx).value()) { 2072 case JVM_CONSTANT_Invalid: 2073 case JVM_CONSTANT_Unicode: 2074 return 1; 2075 2076 case JVM_CONSTANT_Utf8: 2077 return 3 + symbol_at(idx)->utf8_length(); 2078 2079 case JVM_CONSTANT_Class: 2080 case JVM_CONSTANT_String: 2081 case JVM_CONSTANT_ClassIndex: 2082 case JVM_CONSTANT_UnresolvedClass: 2083 case JVM_CONSTANT_UnresolvedClassInError: 2084 case JVM_CONSTANT_Value: 2085 case JVM_CONSTANT_ValueIndex: 2086 case JVM_CONSTANT_UnresolvedValue: 2087 case JVM_CONSTANT_UnresolvedValueInError: 2088 case JVM_CONSTANT_StringIndex: 2089 case JVM_CONSTANT_MethodType: 2090 case JVM_CONSTANT_MethodTypeInError: 2091 return 3; 2092 2093 case JVM_CONSTANT_MethodHandle: 2094 case JVM_CONSTANT_MethodHandleInError: 2095 return 4; //tag, ref_kind, ref_index 2096 2097 case JVM_CONSTANT_Integer: 2098 case JVM_CONSTANT_Float: 2099 case JVM_CONSTANT_Fieldref: 2100 case JVM_CONSTANT_Methodref: 2101 case JVM_CONSTANT_InterfaceMethodref: 2102 case JVM_CONSTANT_NameAndType: 2103 return 5; 2104 2105 case JVM_CONSTANT_Dynamic: 2106 case JVM_CONSTANT_DynamicInError: 2107 case JVM_CONSTANT_InvokeDynamic: 2108 // u1 tag, u2 bsm, u2 nt 2109 return 5; 2110 2111 case JVM_CONSTANT_Long: 2112 case JVM_CONSTANT_Double: 2113 return 9; 2114 } 2115 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); 2116 return 1; 2117 } /* end cpool_entry_size */ 2118 2119 2120 // SymbolHashMap is used to find a constant pool index from a string. 2121 // This function fills in SymbolHashMaps, one for utf8s and one for 2122 // class names, returns size of the cpool raw bytes. 2123 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, 2124 SymbolHashMap *classmap) { 2125 jint size = 0; 2126 2127 for (u2 idx = 1; idx < length(); idx++) { 2128 u2 tag = tag_at(idx).value(); 2129 size += cpool_entry_size(idx); 2130 2131 switch(tag) { 2132 case JVM_CONSTANT_Utf8: { 2133 Symbol* sym = symbol_at(idx); 2134 symmap->add_entry(sym, idx); 2135 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); 2136 break; 2137 } 2138 case JVM_CONSTANT_Class: 2139 case JVM_CONSTANT_UnresolvedClass: 2140 case JVM_CONSTANT_UnresolvedClassInError: { 2141 Symbol* sym = klass_name_at(idx); 2142 classmap->add_entry(sym, idx); 2143 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); 2144 break; 2145 } 2146 case JVM_CONSTANT_Value: 2147 case JVM_CONSTANT_UnresolvedValue: 2148 case JVM_CONSTANT_UnresolvedValueInError: { 2149 Symbol* sym = klass_name_at(idx); 2150 classmap->add_entry(sym, idx); 2151 DBG(printf("adding value type entry %s = %d\n", sym->as_utf8(), idx)); 2152 break; 2153 } 2154 case JVM_CONSTANT_Long: 2155 case JVM_CONSTANT_Double: { 2156 idx++; // Both Long and Double take two cpool slots 2157 break; 2158 } 2159 } 2160 } 2161 return size; 2162 } /* end hash_utf8_entries_to */ 2163 2164 2165 // Copy cpool bytes. 2166 // Returns: 2167 // 0, in case of OutOfMemoryError 2168 // -1, in case of internal error 2169 // > 0, count of the raw cpool bytes that have been copied 2170 int ConstantPool::copy_cpool_bytes(int cpool_size, 2171 SymbolHashMap* tbl, 2172 unsigned char *bytes) { 2173 u2 idx1, idx2; 2174 jint size = 0; 2175 jint cnt = length(); 2176 unsigned char *start_bytes = bytes; 2177 2178 for (jint idx = 1; idx < cnt; idx++) { 2179 u1 tag = tag_at(idx).value(); 2180 jint ent_size = cpool_entry_size(idx); 2181 2182 assert(size + ent_size <= cpool_size, "Size mismatch"); 2183 2184 *bytes = tag; 2185 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag)); 2186 switch(tag) { 2187 case JVM_CONSTANT_Invalid: { 2188 DBG(printf("JVM_CONSTANT_Invalid")); 2189 break; 2190 } 2191 case JVM_CONSTANT_Unicode: { 2192 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); 2193 DBG(printf("JVM_CONSTANT_Unicode")); 2194 break; 2195 } 2196 case JVM_CONSTANT_Utf8: { 2197 Symbol* sym = symbol_at(idx); 2198 char* str = sym->as_utf8(); 2199 // Warning! It's crashing on x86 with len = sym->utf8_length() 2200 int len = (int) strlen(str); 2201 Bytes::put_Java_u2((address) (bytes+1), (u2) len); 2202 for (int i = 0; i < len; i++) { 2203 bytes[3+i] = (u1) str[i]; 2204 } 2205 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); 2206 break; 2207 } 2208 case JVM_CONSTANT_Integer: { 2209 jint val = int_at(idx); 2210 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 2211 break; 2212 } 2213 case JVM_CONSTANT_Float: { 2214 jfloat val = float_at(idx); 2215 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 2216 break; 2217 } 2218 case JVM_CONSTANT_Long: { 2219 jlong val = long_at(idx); 2220 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 2221 idx++; // Long takes two cpool slots 2222 break; 2223 } 2224 case JVM_CONSTANT_Double: { 2225 jdouble val = double_at(idx); 2226 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 2227 idx++; // Double takes two cpool slots 2228 break; 2229 } 2230 case JVM_CONSTANT_Class: 2231 case JVM_CONSTANT_UnresolvedClass: 2232 case JVM_CONSTANT_UnresolvedClassInError: { 2233 *bytes = JVM_CONSTANT_Class; 2234 Symbol* sym = klass_name_at(idx); 2235 idx1 = tbl->symbol_to_value(sym); 2236 assert(idx1 != 0, "Have not found a hashtable entry"); 2237 Bytes::put_Java_u2((address) (bytes+1), idx1); 2238 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); 2239 break; 2240 } 2241 case JVM_CONSTANT_Value: 2242 case JVM_CONSTANT_UnresolvedValue: 2243 case JVM_CONSTANT_UnresolvedValueInError: { 2244 *bytes = JVM_CONSTANT_Value; 2245 Symbol* sym = klass_name_at(idx); 2246 idx1 = tbl->symbol_to_value(sym); 2247 assert(idx1 != 0, "Have not found a hashtable entry"); 2248 Bytes::put_Java_u2((address) (bytes+1), idx1); 2249 DBG(printf("JVM_CONSTANT_Value: idx=#%03hd, %s", idx1, sym->as_utf8())); 2250 break; 2251 } 2252 case JVM_CONSTANT_String: { 2253 *bytes = JVM_CONSTANT_String; 2254 Symbol* sym = unresolved_string_at(idx); 2255 idx1 = tbl->symbol_to_value(sym); 2256 assert(idx1 != 0, "Have not found a hashtable entry"); 2257 Bytes::put_Java_u2((address) (bytes+1), idx1); 2258 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); 2259 break; 2260 } 2261 case JVM_CONSTANT_Fieldref: 2262 case JVM_CONSTANT_Methodref: 2263 case JVM_CONSTANT_InterfaceMethodref: { 2264 idx1 = uncached_klass_ref_index_at(idx); 2265 idx2 = uncached_name_and_type_ref_index_at(idx); 2266 Bytes::put_Java_u2((address) (bytes+1), idx1); 2267 Bytes::put_Java_u2((address) (bytes+3), idx2); 2268 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); 2269 break; 2270 } 2271 case JVM_CONSTANT_NameAndType: { 2272 idx1 = name_ref_index_at(idx); 2273 idx2 = signature_ref_index_at(idx); 2274 Bytes::put_Java_u2((address) (bytes+1), idx1); 2275 Bytes::put_Java_u2((address) (bytes+3), idx2); 2276 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); 2277 break; 2278 } 2279 case JVM_CONSTANT_ClassIndex: { 2280 *bytes = JVM_CONSTANT_Class; 2281 idx1 = klass_index_at(idx); 2282 Bytes::put_Java_u2((address) (bytes+1), idx1); 2283 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); 2284 break; 2285 } 2286 case JVM_CONSTANT_ValueIndex: { 2287 *bytes = JVM_CONSTANT_Value; 2288 idx1 = value_type_index_at(idx); 2289 Bytes::put_Java_u2((address) (bytes+1), idx1); 2290 DBG(printf("JVM_CONSTANT_ValueIndex: %hd", idx1)); 2291 break; 2292 } 2293 case JVM_CONSTANT_StringIndex: { 2294 *bytes = JVM_CONSTANT_String; 2295 idx1 = string_index_at(idx); 2296 Bytes::put_Java_u2((address) (bytes+1), idx1); 2297 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); 2298 break; 2299 } 2300 case JVM_CONSTANT_MethodHandle: 2301 case JVM_CONSTANT_MethodHandleInError: { 2302 *bytes = JVM_CONSTANT_MethodHandle; 2303 int kind = method_handle_ref_kind_at(idx); 2304 idx1 = method_handle_index_at(idx); 2305 *(bytes+1) = (unsigned char) kind; 2306 Bytes::put_Java_u2((address) (bytes+2), idx1); 2307 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); 2308 break; 2309 } 2310 case JVM_CONSTANT_MethodType: 2311 case JVM_CONSTANT_MethodTypeInError: { 2312 *bytes = JVM_CONSTANT_MethodType; 2313 idx1 = method_type_index_at(idx); 2314 Bytes::put_Java_u2((address) (bytes+1), idx1); 2315 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); 2316 break; 2317 } 2318 case JVM_CONSTANT_Dynamic: 2319 case JVM_CONSTANT_DynamicInError: { 2320 *bytes = tag; 2321 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 2322 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 2323 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); 2324 Bytes::put_Java_u2((address) (bytes+1), idx1); 2325 Bytes::put_Java_u2((address) (bytes+3), idx2); 2326 DBG(printf("JVM_CONSTANT_Dynamic: %hd %hd", idx1, idx2)); 2327 break; 2328 } 2329 case JVM_CONSTANT_InvokeDynamic: { 2330 *bytes = tag; 2331 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 2332 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 2333 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); 2334 Bytes::put_Java_u2((address) (bytes+1), idx1); 2335 Bytes::put_Java_u2((address) (bytes+3), idx2); 2336 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); 2337 break; 2338 } 2339 } 2340 DBG(printf("\n")); 2341 bytes += ent_size; 2342 size += ent_size; 2343 } 2344 assert(size == cpool_size, "Size mismatch"); 2345 2346 // Keep temorarily for debugging until it's stable. 2347 DBG(print_cpool_bytes(cnt, start_bytes)); 2348 return (int)(bytes - start_bytes); 2349 } /* end copy_cpool_bytes */ 2350 2351 #undef DBG 2352 2353 2354 void ConstantPool::set_on_stack(const bool value) { 2355 if (value) { 2356 // Only record if it's not already set. 2357 if (!on_stack()) { 2358 assert(!is_shared(), "should always be set for shared constant pools"); 2359 _flags |= _on_stack; 2360 MetadataOnStackMark::record(this); 2361 } 2362 } else { 2363 // Clearing is done single-threadedly. 2364 if (!is_shared()) { 2365 _flags &= ~_on_stack; 2366 } 2367 } 2368 } 2369 2370 // JSR 292 support for patching constant pool oops after the class is linked and 2371 // the oop array for resolved references are created. 2372 // We can't do this during classfile parsing, which is how the other indexes are 2373 // patched. The other patches are applied early for some error checking 2374 // so only defer the pseudo_strings. 2375 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) { 2376 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused 2377 Handle patch = cp_patches->at(index); 2378 if (patch.not_null()) { 2379 assert (tag_at(index).is_string(), "should only be string left"); 2380 // Patching a string means pre-resolving it. 2381 // The spelling in the constant pool is ignored. 2382 // The constant reference may be any object whatever. 2383 // If it is not a real interned string, the constant is referred 2384 // to as a "pseudo-string", and must be presented to the CP 2385 // explicitly, because it may require scavenging. 2386 int obj_index = cp_to_object_index(index); 2387 pseudo_string_at_put(index, obj_index, patch()); 2388 DEBUG_ONLY(cp_patches->at_put(index, Handle());) 2389 } 2390 } 2391 #ifdef ASSERT 2392 // Ensure that all the patches have been used. 2393 for (int index = 0; index < cp_patches->length(); index++) { 2394 assert(cp_patches->at(index).is_null(), 2395 "Unused constant pool patch at %d in class file %s", 2396 index, 2397 pool_holder()->external_name()); 2398 } 2399 #endif // ASSERT 2400 } 2401 2402 #ifndef PRODUCT 2403 2404 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool 2405 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { 2406 guarantee(obj->is_constantPool(), "object must be constant pool"); 2407 constantPoolHandle cp(THREAD, (ConstantPool*)obj); 2408 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); 2409 2410 for (int i = 0; i< cp->length(); i++) { 2411 if (cp->tag_at(i).is_unresolved_klass() || 2412 cp->tag_at(i).is_unresolved_value_type()) { 2413 // This will force loading of the class 2414 Klass* klass = cp->klass_at(i, CHECK); 2415 if (klass->is_instance_klass()) { 2416 // Force initialization of class 2417 InstanceKlass::cast(klass)->initialize(CHECK); 2418 } 2419 } 2420 } 2421 } 2422 2423 #endif 2424 2425 2426 // Printing 2427 2428 void ConstantPool::print_on(outputStream* st) const { 2429 assert(is_constantPool(), "must be constantPool"); 2430 st->print_cr("%s", internal_name()); 2431 if (flags() != 0) { 2432 st->print(" - flags: 0x%x", flags()); 2433 if (has_preresolution()) st->print(" has_preresolution"); 2434 if (on_stack()) st->print(" on_stack"); 2435 st->cr(); 2436 } 2437 if (pool_holder() != NULL) { 2438 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder())); 2439 } 2440 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache())); 2441 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references())); 2442 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map())); 2443 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses())); 2444 2445 for (int index = 1; index < length(); index++) { // Index 0 is unused 2446 ((ConstantPool*)this)->print_entry_on(index, st); 2447 switch (tag_at(index).value()) { 2448 case JVM_CONSTANT_Long : 2449 case JVM_CONSTANT_Double : 2450 index++; // Skip entry following eigth-byte constant 2451 } 2452 2453 } 2454 st->cr(); 2455 } 2456 2457 // Print one constant pool entry 2458 void ConstantPool::print_entry_on(const int index, outputStream* st) { 2459 EXCEPTION_MARK; 2460 st->print(" - %3d : ", index); 2461 tag_at(index).print_on(st); 2462 st->print(" : "); 2463 switch (tag_at(index).value()) { 2464 case JVM_CONSTANT_Class : 2465 { Klass* k = klass_at(index, CATCH); 2466 guarantee(k != NULL, "need klass"); 2467 k->print_value_on(st); 2468 st->print(" {" PTR_FORMAT "}", p2i(k)); 2469 } 2470 break; 2471 case JVM_CONSTANT_Value : 2472 { Klass* k = klass_at(index, CATCH); 2473 guarantee(k != NULL, "need klass"); 2474 k->print_value_on(st); 2475 st->print(" {" PTR_FORMAT "}", p2i(k)); 2476 } 2477 break; 2478 case JVM_CONSTANT_Fieldref : 2479 case JVM_CONSTANT_Methodref : 2480 case JVM_CONSTANT_InterfaceMethodref : 2481 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); 2482 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); 2483 break; 2484 case JVM_CONSTANT_String : 2485 if (is_pseudo_string_at(index)) { 2486 oop anObj = pseudo_string_at(index); 2487 anObj->print_value_on(st); 2488 st->print(" {" PTR_FORMAT "}", p2i(anObj)); 2489 } else { 2490 unresolved_string_at(index)->print_value_on(st); 2491 } 2492 break; 2493 case JVM_CONSTANT_Integer : 2494 st->print("%d", int_at(index)); 2495 break; 2496 case JVM_CONSTANT_Float : 2497 st->print("%f", float_at(index)); 2498 break; 2499 case JVM_CONSTANT_Long : 2500 st->print_jlong(long_at(index)); 2501 break; 2502 case JVM_CONSTANT_Double : 2503 st->print("%lf", double_at(index)); 2504 break; 2505 case JVM_CONSTANT_NameAndType : 2506 st->print("name_index=%d", name_ref_index_at(index)); 2507 st->print(" signature_index=%d", signature_ref_index_at(index)); 2508 break; 2509 case JVM_CONSTANT_Utf8 : 2510 symbol_at(index)->print_value_on(st); 2511 break; 2512 case JVM_CONSTANT_ClassIndex: 2513 case JVM_CONSTANT_ValueIndex: { 2514 int name_index = *int_at_addr(index); 2515 st->print("klass_index=%d ", name_index); 2516 symbol_at(name_index)->print_value_on(st); 2517 } 2518 break; 2519 case JVM_CONSTANT_UnresolvedClass : // fall-through 2520 case JVM_CONSTANT_UnresolvedClassInError : 2521 case JVM_CONSTANT_UnresolvedValue : 2522 case JVM_CONSTANT_UnresolvedValueInError : { 2523 CPKlassSlot kslot = klass_slot_at(index); 2524 int resolved_klass_index = kslot.resolved_klass_index(); 2525 int name_index = kslot.name_index(); 2526 assert(tag_at(name_index).is_symbol(), "sanity"); 2527 2528 Klass* klass = resolved_klasses()->at(resolved_klass_index); 2529 if (klass != NULL) { 2530 klass->print_value_on(st); 2531 } else { 2532 symbol_at(name_index)->print_value_on(st); 2533 } 2534 } 2535 break; 2536 case JVM_CONSTANT_MethodHandle : 2537 case JVM_CONSTANT_MethodHandleInError : 2538 st->print("ref_kind=%d", method_handle_ref_kind_at(index)); 2539 st->print(" ref_index=%d", method_handle_index_at(index)); 2540 break; 2541 case JVM_CONSTANT_MethodType : 2542 case JVM_CONSTANT_MethodTypeInError : 2543 st->print("signature_index=%d", method_type_index_at(index)); 2544 break; 2545 case JVM_CONSTANT_Dynamic : 2546 case JVM_CONSTANT_DynamicInError : 2547 { 2548 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); 2549 st->print(" type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); 2550 int argc = invoke_dynamic_argument_count_at(index); 2551 if (argc > 0) { 2552 for (int arg_i = 0; arg_i < argc; arg_i++) { 2553 int arg = invoke_dynamic_argument_index_at(index, arg_i); 2554 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 2555 } 2556 st->print("}"); 2557 } 2558 } 2559 break; 2560 case JVM_CONSTANT_InvokeDynamic : 2561 { 2562 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); 2563 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); 2564 int argc = invoke_dynamic_argument_count_at(index); 2565 if (argc > 0) { 2566 for (int arg_i = 0; arg_i < argc; arg_i++) { 2567 int arg = invoke_dynamic_argument_index_at(index, arg_i); 2568 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 2569 } 2570 st->print("}"); 2571 } 2572 } 2573 break; 2574 default: 2575 ShouldNotReachHere(); 2576 break; 2577 } 2578 st->cr(); 2579 } 2580 2581 void ConstantPool::print_value_on(outputStream* st) const { 2582 assert(is_constantPool(), "must be constantPool"); 2583 st->print("constant pool [%d]", length()); 2584 if (has_preresolution()) st->print("/preresolution"); 2585 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); 2586 print_address_on(st); 2587 st->print(" for "); 2588 pool_holder()->print_value_on(st); 2589 if (pool_holder() != NULL) { 2590 bool extra = (pool_holder()->constants() != this); 2591 if (extra) st->print(" (extra)"); 2592 } 2593 if (cache() != NULL) { 2594 st->print(" cache=" PTR_FORMAT, p2i(cache())); 2595 } 2596 } 2597 2598 #if INCLUDE_SERVICES 2599 // Size Statistics 2600 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { 2601 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); 2602 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); 2603 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); 2604 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); 2605 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); 2606 2607 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + 2608 sz->_cp_refmap_bytes; 2609 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; 2610 } 2611 #endif // INCLUDE_SERVICES 2612 2613 // Verification 2614 2615 void ConstantPool::verify_on(outputStream* st) { 2616 guarantee(is_constantPool(), "object must be constant pool"); 2617 for (int i = 0; i< length(); i++) { 2618 constantTag tag = tag_at(i); 2619 if (tag.is_klass() || tag.is_unresolved_klass() || 2620 tag.is_value_type() || tag.is_unresolved_value_type()) { 2621 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count"); 2622 } else if (tag.is_symbol()) { 2623 CPSlot entry = slot_at(i); 2624 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2625 } else if (tag.is_string()) { 2626 CPSlot entry = slot_at(i); 2627 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2628 } 2629 } 2630 if (cache() != NULL) { 2631 // Note: cache() can be NULL before a class is completely setup or 2632 // in temporary constant pools used during constant pool merging 2633 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); 2634 } 2635 if (pool_holder() != NULL) { 2636 // Note: pool_holder() can be NULL in temporary constant pools 2637 // used during constant pool merging 2638 guarantee(pool_holder()->is_klass(), "should be klass"); 2639 } 2640 } 2641 2642 2643 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { 2644 char *str = sym->as_utf8(); 2645 unsigned int hash = compute_hash(str, sym->utf8_length()); 2646 unsigned int index = hash % table_size(); 2647 2648 // check if already in map 2649 // we prefer the first entry since it is more likely to be what was used in 2650 // the class file 2651 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2652 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2653 if (en->hash() == hash && en->symbol() == sym) { 2654 return; // already there 2655 } 2656 } 2657 2658 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); 2659 entry->set_next(bucket(index)); 2660 _buckets[index].set_entry(entry); 2661 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2662 } 2663 2664 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { 2665 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); 2666 char *str = sym->as_utf8(); 2667 int len = sym->utf8_length(); 2668 unsigned int hash = SymbolHashMap::compute_hash(str, len); 2669 unsigned int index = hash % table_size(); 2670 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2671 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2672 if (en->hash() == hash && en->symbol() == sym) { 2673 return en; 2674 } 2675 } 2676 return NULL; 2677 } 2678 2679 void SymbolHashMap::initialize_table(int table_size) { 2680 _table_size = table_size; 2681 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol); 2682 for (int index = 0; index < table_size; index++) { 2683 _buckets[index].clear(); 2684 } 2685 }