1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoaderData.hpp" 27 #include "classfile/javaClasses.inline.hpp" 28 #include "classfile/metadataOnStackMark.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "interpreter/linkResolver.hpp" 33 #include "memory/heapInspection.hpp" 34 #include "memory/metadataFactory.hpp" 35 #include "memory/metaspaceClosure.hpp" 36 #include "memory/metaspaceShared.hpp" 37 #include "memory/oopFactory.hpp" 38 #include "memory/resourceArea.hpp" 39 #include "oops/constantPool.hpp" 40 #include "oops/instanceKlass.hpp" 41 #include "oops/objArrayKlass.hpp" 42 #include "oops/objArrayOop.inline.hpp" 43 #include "oops/oop.inline.hpp" 44 #include "prims/jvm.h" 45 #include "runtime/fieldType.hpp" 46 #include "runtime/init.hpp" 47 #include "runtime/javaCalls.hpp" 48 #include "runtime/signature.hpp" 49 #include "runtime/vframe.hpp" 50 #include "utilities/copy.hpp" 51 #if INCLUDE_ALL_GCS 52 #include "gc/g1/g1SATBCardTableModRefBS.hpp" 53 #endif // INCLUDE_ALL_GCS 54 55 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { 56 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL); 57 int size = ConstantPool::size(length); 58 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); 59 } 60 61 #ifdef ASSERT 62 63 // MetaspaceObj allocation invariant is calloc equivalent memory 64 // simple verification of this here (JVM_CONSTANT_Invalid == 0 ) 65 static bool tag_array_is_zero_initialized(Array<u1>* tags) { 66 assert(tags != NULL, "invariant"); 67 const int length = tags->length(); 68 for (int index = 0; index < length; ++index) { 69 if (JVM_CONSTANT_Invalid != tags->at(index)) { 70 return false; 71 } 72 } 73 return true; 74 } 75 76 #endif 77 78 ConstantPool::ConstantPool(Array<u1>* tags) : 79 _tags(tags), 80 _length(tags->length()) { 81 82 assert(_tags != NULL, "invariant"); 83 assert(tags->length() == _length, "invariant"); 84 assert(tag_array_is_zero_initialized(tags), "invariant"); 85 assert(0 == flags(), "invariant"); 86 assert(0 == version(), "invariant"); 87 assert(NULL == _pool_holder, "invariant"); 88 } 89 90 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { 91 if (cache() != NULL) { 92 MetadataFactory::free_metadata(loader_data, cache()); 93 set_cache(NULL); 94 } 95 96 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses()); 97 set_resolved_klasses(NULL); 98 99 MetadataFactory::free_array<jushort>(loader_data, operands()); 100 set_operands(NULL); 101 102 release_C_heap_structures(); 103 104 // free tag array 105 MetadataFactory::free_array<u1>(loader_data, tags()); 106 set_tags(NULL); 107 } 108 109 void ConstantPool::release_C_heap_structures() { 110 // walk constant pool and decrement symbol reference counts 111 unreference_symbols(); 112 } 113 114 void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) { 115 log_trace(cds)("Iter(ConstantPool): %p", this); 116 117 it->push(&_tags, MetaspaceClosure::_writable); 118 it->push(&_cache); 119 it->push(&_pool_holder); 120 it->push(&_operands); 121 it->push(&_resolved_klasses, MetaspaceClosure::_writable); 122 123 for (int i = 0; i < length(); i++) { 124 // The only MSO's embedded in the CP entries are Symbols: 125 // JVM_CONSTANT_String (normal and pseudo) 126 // JVM_CONSTANT_Utf8 127 constantTag ctag = tag_at(i); 128 if (ctag.is_string() || ctag.is_utf8()) { 129 it->push(symbol_at_addr(i)); 130 } 131 } 132 } 133 134 objArrayOop ConstantPool::resolved_references() const { 135 if (_cache == NULL) { 136 return NULL; 137 } else { 138 return (objArrayOop)_cache->resolved_references(); 139 } 140 } 141 142 // Create resolved_references array and mapping array for original cp indexes 143 // The ldc bytecode was rewritten to have the resolved reference array index so need a way 144 // to map it back for resolving and some unlikely miscellaneous uses. 145 // The objects created by invokedynamic are appended to this list. 146 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, 147 const intStack& reference_map, 148 int constant_pool_map_length, 149 TRAPS) { 150 // Initialized the resolved object cache. 151 int map_length = reference_map.length(); 152 if (map_length > 0) { 153 // Only need mapping back to constant pool entries. The map isn't used for 154 // invokedynamic resolved_reference entries. For invokedynamic entries, 155 // the constant pool cache index has the mapping back to both the constant 156 // pool and to the resolved reference index. 157 if (constant_pool_map_length > 0) { 158 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK); 159 160 for (int i = 0; i < constant_pool_map_length; i++) { 161 int x = reference_map.at(i); 162 assert(x == (int)(jushort) x, "klass index is too big"); 163 om->at_put(i, (jushort)x); 164 } 165 set_reference_map(om); 166 } 167 168 // Create Java array for holding resolved strings, methodHandles, 169 // methodTypes, invokedynamic and invokehandle appendix objects, etc. 170 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 171 Handle refs_handle (THREAD, (oop)stom); // must handleize. 172 set_resolved_references(loader_data->add_handle(refs_handle)); 173 } 174 } 175 176 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) { 177 // A ConstantPool can't possibly have 0xffff valid class entries, 178 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8 179 // entry for the class's name. So at most we will have 0xfffe class entries. 180 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate 181 // UnresolvedKlass entries that are temporarily created during class redefinition. 182 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity"); 183 assert(resolved_klasses() == NULL, "sanity"); 184 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK); 185 set_resolved_klasses(rk); 186 } 187 188 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) { 189 int len = length(); 190 int num_klasses = 0; 191 for (int i = 1; i <len; i++) { 192 switch (tag_at(i).value()) { 193 case JVM_CONSTANT_ClassIndex: 194 { 195 const int class_index = klass_index_at(i); 196 unresolved_klass_at_put(i, class_index, num_klasses++); 197 } 198 break; 199 #ifndef PRODUCT 200 case JVM_CONSTANT_Class: 201 case JVM_CONSTANT_UnresolvedClass: 202 case JVM_CONSTANT_UnresolvedClassInError: 203 // All of these should have been reverted back to ClassIndex before calling 204 // this function. 205 ShouldNotReachHere(); 206 #endif 207 } 208 } 209 allocate_resolved_klasses(loader_data, num_klasses, THREAD); 210 } 211 212 // Anonymous class support: 213 void ConstantPool::klass_at_put(int class_index, int name_index, int resolved_klass_index, Klass* k, Symbol* name) { 214 assert(is_within_bounds(class_index), "index out of bounds"); 215 assert(is_within_bounds(name_index), "index out of bounds"); 216 assert((resolved_klass_index & 0xffff0000) == 0, "must be"); 217 *int_at_addr(class_index) = 218 build_int_from_shorts((jushort)resolved_klass_index, (jushort)name_index); 219 220 symbol_at_put(name_index, name); 221 name->increment_refcount(); 222 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index); 223 OrderAccess::release_store_ptr((Klass* volatile *)adr, k); 224 225 // The interpreter assumes when the tag is stored, the klass is resolved 226 // and the Klass* non-NULL, so we need hardware store ordering here. 227 if (k != NULL) { 228 release_tag_at_put(class_index, JVM_CONSTANT_Class); 229 } else { 230 release_tag_at_put(class_index, JVM_CONSTANT_UnresolvedClass); 231 } 232 } 233 234 // Anonymous class support: 235 void ConstantPool::klass_at_put(int class_index, Klass* k) { 236 assert(k != NULL, "must be valid klass"); 237 CPKlassSlot kslot = klass_slot_at(class_index); 238 int resolved_klass_index = kslot.resolved_klass_index(); 239 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index); 240 OrderAccess::release_store_ptr((Klass* volatile *)adr, k); 241 242 // The interpreter assumes when the tag is stored, the klass is resolved 243 // and the Klass* non-NULL, so we need hardware store ordering here. 244 release_tag_at_put(class_index, JVM_CONSTANT_Class); 245 } 246 247 #if INCLUDE_CDS_JAVA_HEAP 248 // Archive the resolved references 249 void ConstantPool::archive_resolved_references(Thread* THREAD) { 250 if (_cache == NULL) { 251 return; // nothing to do 252 } 253 254 InstanceKlass *ik = pool_holder(); 255 if (!(ik->is_shared_boot_class() || ik->is_shared_platform_class() || 256 ik->is_shared_app_class())) { 257 // Archiving resolved references for classes from non-builtin loaders 258 // is not yet supported. 259 set_resolved_references(NULL); 260 return; 261 } 262 263 objArrayOop rr = resolved_references(); 264 if (rr != NULL) { 265 for (int i = 0; i < rr->length(); i++) { 266 oop p = rr->obj_at(i); 267 if (p != NULL) { 268 int index = object_to_cp_index(i); 269 // Skip the entry if the string hash code is 0 since the string 270 // is not included in the shared string_table, see StringTable::copy_shared_string. 271 if (tag_at(index).is_string() && java_lang_String::hash_code(p) != 0) { 272 oop op = StringTable::create_archived_string(p, THREAD); 273 // If the String object is not archived (possibly too large), 274 // NULL is returned. Also set it in the array, so we won't 275 // have a 'bad' reference in the archived resolved_reference 276 // array. 277 rr->obj_at_put(i, op); 278 } else { 279 rr->obj_at_put(i, NULL); 280 } 281 } 282 } 283 oop archived = MetaspaceShared::archive_heap_object(rr, THREAD); 284 _cache->set_archived_references(archived); 285 set_resolved_references(NULL); 286 } 287 } 288 #endif 289 290 // CDS support. Create a new resolved_references array. 291 void ConstantPool::restore_unshareable_info(TRAPS) { 292 assert(is_constantPool(), "ensure C++ vtable is restored"); 293 assert(on_stack(), "should always be set for shared constant pools"); 294 assert(is_shared(), "should always be set for shared constant pools"); 295 assert(_cache != NULL, "constant pool _cache should not be NULL"); 296 297 // Only create the new resolved references array if it hasn't been attempted before 298 if (resolved_references() != NULL) return; 299 300 // restore the C++ vtable from the shared archive 301 restore_vtable(); 302 303 if (SystemDictionary::Object_klass_loaded()) { 304 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 305 #if INCLUDE_CDS_JAVA_HEAP 306 if (MetaspaceShared::open_archive_heap_region_mapped() && 307 _cache->archived_references() != NULL) { 308 oop archived = _cache->archived_references(); 309 // Make sure GC knows the cached object is now live. This is necessary after 310 // initial GC marking and during concurrent marking as strong roots are only 311 // scanned during initial marking (at the start of the GC marking). 312 assert(UseG1GC, "Requires G1 GC"); 313 G1SATBCardTableModRefBS::enqueue(archived); 314 // Create handle for the archived resolved reference array object 315 Handle refs_handle(THREAD, (oop)archived); 316 set_resolved_references(loader_data->add_handle(refs_handle)); 317 } else 318 #endif 319 { 320 // No mapped archived resolved reference array 321 // Recreate the object array and add to ClassLoaderData. 322 int map_length = resolved_reference_length(); 323 if (map_length > 0) { 324 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 325 Handle refs_handle(THREAD, (oop)stom); // must handleize. 326 set_resolved_references(loader_data->add_handle(refs_handle)); 327 } 328 } 329 } 330 } 331 332 void ConstantPool::remove_unshareable_info() { 333 // Resolved references are not in the shared archive. 334 // Save the length for restoration. It is not necessarily the same length 335 // as reference_map.length() if invokedynamic is saved. It is needed when 336 // re-creating the resolved reference array if archived heap data cannot be map 337 // at runtime. 338 set_resolved_reference_length( 339 resolved_references() != NULL ? resolved_references()->length() : 0); 340 341 // If archiving heap objects is not allowed, clear the resolved references. 342 // Otherwise, it is cleared after the resolved references array is cached 343 // (see archive_resolved_references()). 344 if (!MetaspaceShared::is_heap_object_archiving_allowed()) { 345 set_resolved_references(NULL); 346 } 347 348 // Shared ConstantPools are in the RO region, so the _flags cannot be modified. 349 // The _on_stack flag is used to prevent ConstantPools from deallocation during 350 // class redefinition. Since shared ConstantPools cannot be deallocated anyway, 351 // we always set _on_stack to true to avoid having to change _flags during runtime. 352 _flags |= (_on_stack | _is_shared); 353 } 354 355 int ConstantPool::cp_to_object_index(int cp_index) { 356 // this is harder don't do this so much. 357 int i = reference_map()->find(cp_index); 358 // We might not find the index for jsr292 call. 359 return (i < 0) ? _no_index_sentinel : i; 360 } 361 362 void ConstantPool::string_at_put(int which, int obj_index, oop str) { 363 resolved_references()->obj_at_put(obj_index, str); 364 } 365 366 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) { 367 ResourceMark rm; 368 int line_number = -1; 369 const char * source_file = NULL; 370 if (JavaThread::current()->has_last_Java_frame()) { 371 // try to identify the method which called this function. 372 vframeStream vfst(JavaThread::current()); 373 if (!vfst.at_end()) { 374 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 375 Symbol* s = vfst.method()->method_holder()->source_file_name(); 376 if (s != NULL) { 377 source_file = s->as_C_string(); 378 } 379 } 380 } 381 if (k != this_cp->pool_holder()) { 382 // only print something if the classes are different 383 if (source_file != NULL) { 384 log_debug(class, resolve)("%s %s %s:%d", 385 this_cp->pool_holder()->external_name(), 386 k->external_name(), source_file, line_number); 387 } else { 388 log_debug(class, resolve)("%s %s", 389 this_cp->pool_holder()->external_name(), 390 k->external_name()); 391 } 392 } 393 } 394 395 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which, 396 bool save_resolution_error, TRAPS) { 397 assert(THREAD->is_Java_thread(), "must be a Java thread"); 398 399 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 400 // It is not safe to rely on the tag bit's here, since we don't have a lock, and 401 // the entry and tag is not updated atomicly. 402 CPKlassSlot kslot = this_cp->klass_slot_at(which); 403 int resolved_klass_index = kslot.resolved_klass_index(); 404 int name_index = kslot.name_index(); 405 assert(this_cp->tag_at(name_index).is_symbol(), "sanity"); 406 407 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index); 408 if (klass != NULL) { 409 return klass; 410 } 411 412 // This tag doesn't change back to unresolved class unless at a safepoint. 413 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) { 414 // The original attempt to resolve this constant pool entry failed so find the 415 // class of the original error and throw another error of the same class 416 // (JVMS 5.4.3). 417 // If there is a detail message, pass that detail message to the error. 418 // The JVMS does not strictly require us to duplicate the same detail message, 419 // or any internal exception fields such as cause or stacktrace. But since the 420 // detail message is often a class name or other literal string, we will repeat it 421 // if we can find it in the symbol table. 422 throw_resolution_error(this_cp, which, CHECK_0); 423 ShouldNotReachHere(); 424 } 425 426 Handle mirror_handle; 427 Symbol* name = this_cp->symbol_at(name_index); 428 Handle loader (THREAD, this_cp->pool_holder()->class_loader()); 429 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain()); 430 Klass* k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD); 431 if (!HAS_PENDING_EXCEPTION) { 432 // preserve the resolved klass from unloading 433 mirror_handle = Handle(THREAD, k->java_mirror()); 434 // Do access check for klasses 435 verify_constant_pool_resolve(this_cp, k, THREAD); 436 } 437 438 // Failed to resolve class. We must record the errors so that subsequent attempts 439 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). 440 if (HAS_PENDING_EXCEPTION) { 441 if (save_resolution_error) { 442 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL); 443 // If CHECK_NULL above doesn't return the exception, that means that 444 // some other thread has beaten us and has resolved the class. 445 // To preserve old behavior, we return the resolved class. 446 klass = this_cp->resolved_klasses()->at(resolved_klass_index); 447 assert(klass != NULL, "must be resolved if exception was cleared"); 448 return klass; 449 } else { 450 return NULL; // return the pending exception 451 } 452 } 453 454 // Make this class loader depend upon the class loader owning the class reference 455 ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data(); 456 this_key->record_dependency(k, CHECK_NULL); // Can throw OOM 457 458 // logging for class+resolve. 459 if (log_is_enabled(Debug, class, resolve)){ 460 trace_class_resolution(this_cp, k); 461 } 462 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index); 463 OrderAccess::release_store_ptr((Klass* volatile *)adr, k); 464 // The interpreter assumes when the tag is stored, the klass is resolved 465 // and the Klass* stored in _resolved_klasses is non-NULL, so we need 466 // hardware store ordering here. 467 this_cp->release_tag_at_put(which, JVM_CONSTANT_Class); 468 return k; 469 } 470 471 472 // Does not update ConstantPool* - to avoid any exception throwing. Used 473 // by compiler and exception handling. Also used to avoid classloads for 474 // instanceof operations. Returns NULL if the class has not been loaded or 475 // if the verification of constant pool failed 476 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) { 477 CPKlassSlot kslot = this_cp->klass_slot_at(which); 478 int resolved_klass_index = kslot.resolved_klass_index(); 479 int name_index = kslot.name_index(); 480 assert(this_cp->tag_at(name_index).is_symbol(), "sanity"); 481 482 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index); 483 if (k != NULL) { 484 return k; 485 } else { 486 Thread *thread = Thread::current(); 487 Symbol* name = this_cp->symbol_at(name_index); 488 oop loader = this_cp->pool_holder()->class_loader(); 489 oop protection_domain = this_cp->pool_holder()->protection_domain(); 490 Handle h_prot (thread, protection_domain); 491 Handle h_loader (thread, loader); 492 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); 493 494 if (k != NULL) { 495 // Make sure that resolving is legal 496 EXCEPTION_MARK; 497 // return NULL if verification fails 498 verify_constant_pool_resolve(this_cp, k, THREAD); 499 if (HAS_PENDING_EXCEPTION) { 500 CLEAR_PENDING_EXCEPTION; 501 return NULL; 502 } 503 return k; 504 } else { 505 return k; 506 } 507 } 508 } 509 510 511 Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) { 512 return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which)); 513 } 514 515 516 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool, 517 int which) { 518 if (cpool->cache() == NULL) return NULL; // nothing to load yet 519 int cache_index = decode_cpcache_index(which, true); 520 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { 521 // FIXME: should be an assert 522 log_debug(class, resolve)("bad operand %d in:", which); cpool->print(); 523 return NULL; 524 } 525 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 526 return e->method_if_resolved(cpool); 527 } 528 529 530 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 531 if (cpool->cache() == NULL) return false; // nothing to load yet 532 int cache_index = decode_cpcache_index(which, true); 533 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 534 return e->has_appendix(); 535 } 536 537 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 538 if (cpool->cache() == NULL) return NULL; // nothing to load yet 539 int cache_index = decode_cpcache_index(which, true); 540 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 541 return e->appendix_if_resolved(cpool); 542 } 543 544 545 bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) { 546 if (cpool->cache() == NULL) return false; // nothing to load yet 547 int cache_index = decode_cpcache_index(which, true); 548 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 549 return e->has_method_type(); 550 } 551 552 oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) { 553 if (cpool->cache() == NULL) return NULL; // nothing to load yet 554 int cache_index = decode_cpcache_index(which, true); 555 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 556 return e->method_type_if_resolved(cpool); 557 } 558 559 560 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { 561 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 562 return symbol_at(name_index); 563 } 564 565 566 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { 567 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 568 return symbol_at(signature_index); 569 } 570 571 572 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { 573 int i = which; 574 if (!uncached && cache() != NULL) { 575 if (ConstantPool::is_invokedynamic_index(which)) { 576 // Invokedynamic index is index into the constant pool cache 577 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); 578 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); 579 assert(tag_at(pool_index).is_name_and_type(), ""); 580 return pool_index; 581 } 582 // change byte-ordering and go via cache 583 i = remap_instruction_operand_from_cache(which); 584 } else { 585 if (tag_at(which).is_invoke_dynamic()) { 586 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); 587 assert(tag_at(pool_index).is_name_and_type(), ""); 588 return pool_index; 589 } 590 } 591 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 592 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); 593 jint ref_index = *int_at_addr(i); 594 return extract_high_short_from_int(ref_index); 595 } 596 597 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) { 598 int pool_index = which; 599 if (!uncached && cache() != NULL) { 600 if (ConstantPool::is_invokedynamic_index(which)) { 601 // Invokedynamic index is index into resolved_references 602 pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); 603 } else { 604 // change byte-ordering and go via cache 605 pool_index = remap_instruction_operand_from_cache(which); 606 } 607 } 608 return tag_at(pool_index); 609 } 610 611 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { 612 guarantee(!ConstantPool::is_invokedynamic_index(which), 613 "an invokedynamic instruction does not have a klass"); 614 int i = which; 615 if (!uncached && cache() != NULL) { 616 // change byte-ordering and go via cache 617 i = remap_instruction_operand_from_cache(which); 618 } 619 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 620 jint ref_index = *int_at_addr(i); 621 return extract_low_short_from_int(ref_index); 622 } 623 624 625 626 int ConstantPool::remap_instruction_operand_from_cache(int operand) { 627 int cpc_index = operand; 628 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); 629 assert((int)(u2)cpc_index == cpc_index, "clean u2"); 630 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); 631 return member_index; 632 } 633 634 635 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) { 636 if (k->is_instance_klass() || k->is_objArray_klass()) { 637 InstanceKlass* holder = this_cp->pool_holder(); 638 Klass* elem = k->is_instance_klass() ? k : ObjArrayKlass::cast(k)->bottom_klass(); 639 640 // The element type could be a typeArray - we only need the access check if it is 641 // an reference to another class 642 if (elem->is_instance_klass()) { 643 LinkResolver::check_klass_accessability(holder, elem, CHECK); 644 } 645 } 646 } 647 648 649 int ConstantPool::name_ref_index_at(int which_nt) { 650 jint ref_index = name_and_type_at(which_nt); 651 return extract_low_short_from_int(ref_index); 652 } 653 654 655 int ConstantPool::signature_ref_index_at(int which_nt) { 656 jint ref_index = name_and_type_at(which_nt); 657 return extract_high_short_from_int(ref_index); 658 } 659 660 661 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { 662 return klass_at(klass_ref_index_at(which), THREAD); 663 } 664 665 Symbol* ConstantPool::klass_name_at(int which) const { 666 return symbol_at(klass_slot_at(which).name_index()); 667 } 668 669 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { 670 jint ref_index = klass_ref_index_at(which); 671 return klass_at_noresolve(ref_index); 672 } 673 674 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { 675 jint ref_index = uncached_klass_ref_index_at(which); 676 return klass_at_noresolve(ref_index); 677 } 678 679 char* ConstantPool::string_at_noresolve(int which) { 680 return unresolved_string_at(which)->as_C_string(); 681 } 682 683 BasicType ConstantPool::basic_type_for_signature_at(int which) const { 684 return FieldType::basic_type(symbol_at(which)); 685 } 686 687 688 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) { 689 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused 690 if (this_cp->tag_at(index).is_string()) { 691 this_cp->string_at(index, CHECK); 692 } 693 } 694 } 695 696 bool ConstantPool::resolve_class_constants(TRAPS) { 697 constantPoolHandle cp(THREAD, this); 698 for (int index = 1; index < length(); index++) { // Index 0 is unused 699 if (tag_at(index).is_string()) { 700 Symbol* sym = cp->unresolved_string_at(index); 701 // Look up only. Only resolve references to already interned strings. 702 oop str = StringTable::lookup(sym); 703 if (str != NULL) { 704 int cache_index = cp->cp_to_object_index(index); 705 cp->string_at_put(index, cache_index, str); 706 } 707 } 708 } 709 return true; 710 } 711 712 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) { 713 // Dig out the detailed message to reuse if possible 714 Symbol* message = java_lang_Throwable::detail_message(pending_exception); 715 if (message != NULL) { 716 return message; 717 } 718 719 // Return specific message for the tag 720 switch (tag.value()) { 721 case JVM_CONSTANT_UnresolvedClass: 722 // return the class name in the error message 723 message = this_cp->klass_name_at(which); 724 break; 725 case JVM_CONSTANT_MethodHandle: 726 // return the method handle name in the error message 727 message = this_cp->method_handle_name_ref_at(which); 728 break; 729 case JVM_CONSTANT_MethodType: 730 // return the method type signature in the error message 731 message = this_cp->method_type_signature_at(which); 732 break; 733 default: 734 ShouldNotReachHere(); 735 } 736 737 return message; 738 } 739 740 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) { 741 Symbol* message = NULL; 742 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message); 743 assert(error != NULL && message != NULL, "checking"); 744 CLEAR_PENDING_EXCEPTION; 745 ResourceMark rm; 746 THROW_MSG(error, message->as_C_string()); 747 } 748 749 // If resolution for Class, MethodHandle or MethodType fails, save the exception 750 // in the resolution error table, so that the same exception is thrown again. 751 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which, 752 constantTag tag, TRAPS) { 753 Symbol* error = PENDING_EXCEPTION->klass()->name(); 754 755 int error_tag = tag.error_value(); 756 757 if (!PENDING_EXCEPTION-> 758 is_a(SystemDictionary::LinkageError_klass())) { 759 // Just throw the exception and don't prevent these classes from 760 // being loaded due to virtual machine errors like StackOverflow 761 // and OutOfMemoryError, etc, or if the thread was hit by stop() 762 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 763 } else if (this_cp->tag_at(which).value() != error_tag) { 764 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION); 765 SystemDictionary::add_resolution_error(this_cp, which, error, message); 766 // CAS in the tag. If a thread beat us to registering this error that's fine. 767 // If another thread resolved the reference, this is a race condition. This 768 // thread may have had a security manager or something temporary. 769 // This doesn't deterministically get an error. So why do we save this? 770 // We save this because jvmti can add classes to the bootclass path after 771 // this error, so it needs to get the same error if the error is first. 772 jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag, 773 (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value()); 774 if (old_tag != error_tag && old_tag != tag.value()) { 775 // MethodHandles and MethodType doesn't change to resolved version. 776 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value"); 777 // Forget the exception and use the resolved class. 778 CLEAR_PENDING_EXCEPTION; 779 } 780 } else { 781 // some other thread put this in error state 782 throw_resolution_error(this_cp, which, CHECK); 783 } 784 } 785 786 // Called to resolve constants in the constant pool and return an oop. 787 // Some constant pool entries cache their resolved oop. This is also 788 // called to create oops from constants to use in arguments for invokedynamic 789 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) { 790 oop result_oop = NULL; 791 Handle throw_exception; 792 793 if (cache_index == _possible_index_sentinel) { 794 // It is possible that this constant is one which is cached in the objects. 795 // We'll do a linear search. This should be OK because this usage is rare. 796 assert(index > 0, "valid index"); 797 cache_index = this_cp->cp_to_object_index(index); 798 } 799 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); 800 assert(index == _no_index_sentinel || index >= 0, ""); 801 802 if (cache_index >= 0) { 803 result_oop = this_cp->resolved_references()->obj_at(cache_index); 804 if (result_oop != NULL) { 805 return result_oop; 806 // That was easy... 807 } 808 index = this_cp->object_to_cp_index(cache_index); 809 } 810 811 jvalue prim_value; // temp used only in a few cases below 812 813 constantTag tag = this_cp->tag_at(index); 814 815 switch (tag.value()) { 816 817 case JVM_CONSTANT_UnresolvedClass: 818 case JVM_CONSTANT_UnresolvedClassInError: 819 case JVM_CONSTANT_Class: 820 { 821 assert(cache_index == _no_index_sentinel, "should not have been set"); 822 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL); 823 // ldc wants the java mirror. 824 result_oop = resolved->java_mirror(); 825 break; 826 } 827 828 case JVM_CONSTANT_String: 829 assert(cache_index != _no_index_sentinel, "should have been set"); 830 if (this_cp->is_pseudo_string_at(index)) { 831 result_oop = this_cp->pseudo_string_at(index, cache_index); 832 break; 833 } 834 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL); 835 break; 836 837 case JVM_CONSTANT_MethodHandleInError: 838 case JVM_CONSTANT_MethodTypeInError: 839 { 840 throw_resolution_error(this_cp, index, CHECK_NULL); 841 break; 842 } 843 844 case JVM_CONSTANT_MethodHandle: 845 { 846 int ref_kind = this_cp->method_handle_ref_kind_at(index); 847 int callee_index = this_cp->method_handle_klass_index_at(index); 848 Symbol* name = this_cp->method_handle_name_ref_at(index); 849 Symbol* signature = this_cp->method_handle_signature_ref_at(index); 850 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index)); 851 { ResourceMark rm(THREAD); 852 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", 853 ref_kind, index, this_cp->method_handle_index_at(index), 854 callee_index, name->as_C_string(), signature->as_C_string()); 855 } 856 857 Klass* callee = klass_at_impl(this_cp, callee_index, true, CHECK_NULL); 858 859 // Check constant pool method consistency 860 if ((callee->is_interface() && m_tag.is_method()) || 861 ((!callee->is_interface() && m_tag.is_interface_method()))) { 862 ResourceMark rm(THREAD); 863 char buf[400]; 864 jio_snprintf(buf, sizeof(buf), 865 "Inconsistent constant pool data in classfile for class %s. " 866 "Method %s%s at index %d is %s and should be %s", 867 callee->name()->as_C_string(), name->as_C_string(), signature->as_C_string(), index, 868 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef", 869 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef"); 870 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), buf); 871 } 872 873 Klass* klass = this_cp->pool_holder(); 874 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, 875 callee, name, signature, 876 THREAD); 877 result_oop = value(); 878 if (HAS_PENDING_EXCEPTION) { 879 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 880 } 881 break; 882 } 883 884 case JVM_CONSTANT_MethodType: 885 { 886 Symbol* signature = this_cp->method_type_signature_at(index); 887 { ResourceMark rm(THREAD); 888 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s", 889 index, this_cp->method_type_index_at(index), 890 signature->as_C_string()); 891 } 892 Klass* klass = this_cp->pool_holder(); 893 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); 894 result_oop = value(); 895 if (HAS_PENDING_EXCEPTION) { 896 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 897 } 898 break; 899 } 900 901 case JVM_CONSTANT_Integer: 902 assert(cache_index == _no_index_sentinel, "should not have been set"); 903 prim_value.i = this_cp->int_at(index); 904 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); 905 break; 906 907 case JVM_CONSTANT_Float: 908 assert(cache_index == _no_index_sentinel, "should not have been set"); 909 prim_value.f = this_cp->float_at(index); 910 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); 911 break; 912 913 case JVM_CONSTANT_Long: 914 assert(cache_index == _no_index_sentinel, "should not have been set"); 915 prim_value.j = this_cp->long_at(index); 916 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); 917 break; 918 919 case JVM_CONSTANT_Double: 920 assert(cache_index == _no_index_sentinel, "should not have been set"); 921 prim_value.d = this_cp->double_at(index); 922 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); 923 break; 924 925 default: 926 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", 927 this_cp(), index, cache_index, tag.value())); 928 assert(false, "unexpected constant tag"); 929 break; 930 } 931 932 if (cache_index >= 0) { 933 // Benign race condition: resolved_references may already be filled in. 934 // The important thing here is that all threads pick up the same result. 935 // It doesn't matter which racing thread wins, as long as only one 936 // result is used by all threads, and all future queries. 937 oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL); 938 if (old_result == NULL) { 939 return result_oop; // was installed 940 } else { 941 // Return the winning thread's result. This can be different than 942 // the result here for MethodHandles. 943 return old_result; 944 } 945 } else { 946 return result_oop; 947 } 948 } 949 950 oop ConstantPool::uncached_string_at(int which, TRAPS) { 951 Symbol* sym = unresolved_string_at(which); 952 oop str = StringTable::intern(sym, CHECK_(NULL)); 953 assert(java_lang_String::is_instance(str), "must be string"); 954 return str; 955 } 956 957 958 oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) { 959 assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); 960 961 Handle bsm; 962 int argc; 963 { 964 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments 965 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. 966 // It is accompanied by the optional arguments. 967 int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index); 968 oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); 969 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { 970 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); 971 } 972 973 // Extract the optional static arguments. 974 argc = this_cp->invoke_dynamic_argument_count_at(index); 975 if (argc == 0) return bsm_oop; 976 977 bsm = Handle(THREAD, bsm_oop); 978 } 979 980 objArrayHandle info; 981 { 982 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); 983 info = objArrayHandle(THREAD, info_oop); 984 } 985 986 info->obj_at_put(0, bsm()); 987 for (int i = 0; i < argc; i++) { 988 int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i); 989 oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); 990 info->obj_at_put(1+i, arg_oop); 991 } 992 993 return info(); 994 } 995 996 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) { 997 // If the string has already been interned, this entry will be non-null 998 oop str = this_cp->resolved_references()->obj_at(obj_index); 999 if (str != NULL) return str; 1000 Symbol* sym = this_cp->unresolved_string_at(which); 1001 str = StringTable::intern(sym, CHECK_(NULL)); 1002 this_cp->string_at_put(which, obj_index, str); 1003 assert(java_lang_String::is_instance(str), "must be string"); 1004 return str; 1005 } 1006 1007 1008 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) { 1009 // Names are interned, so we can compare Symbol*s directly 1010 Symbol* cp_name = klass_name_at(which); 1011 return (cp_name == k->name()); 1012 } 1013 1014 1015 // Iterate over symbols and decrement ones which are Symbol*s 1016 // This is done during GC. 1017 // Only decrement the UTF8 symbols. Strings point to 1018 // these symbols but didn't increment the reference count. 1019 void ConstantPool::unreference_symbols() { 1020 for (int index = 1; index < length(); index++) { // Index 0 is unused 1021 constantTag tag = tag_at(index); 1022 if (tag.is_symbol()) { 1023 symbol_at(index)->decrement_refcount(); 1024 } 1025 } 1026 } 1027 1028 1029 // Compare this constant pool's entry at index1 to the constant pool 1030 // cp2's entry at index2. 1031 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2, 1032 int index2, TRAPS) { 1033 1034 // The error tags are equivalent to non-error tags when comparing 1035 jbyte t1 = tag_at(index1).non_error_value(); 1036 jbyte t2 = cp2->tag_at(index2).non_error_value(); 1037 1038 if (t1 != t2) { 1039 // Not the same entry type so there is nothing else to check. Note 1040 // that this style of checking will consider resolved/unresolved 1041 // class pairs as different. 1042 // From the ConstantPool* API point of view, this is correct 1043 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this 1044 // plays out in the context of ConstantPool* merging. 1045 return false; 1046 } 1047 1048 switch (t1) { 1049 case JVM_CONSTANT_Class: 1050 { 1051 Klass* k1 = klass_at(index1, CHECK_false); 1052 Klass* k2 = cp2->klass_at(index2, CHECK_false); 1053 if (k1 == k2) { 1054 return true; 1055 } 1056 } break; 1057 1058 case JVM_CONSTANT_ClassIndex: 1059 { 1060 int recur1 = klass_index_at(index1); 1061 int recur2 = cp2->klass_index_at(index2); 1062 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1063 if (match) { 1064 return true; 1065 } 1066 } break; 1067 1068 case JVM_CONSTANT_Double: 1069 { 1070 jdouble d1 = double_at(index1); 1071 jdouble d2 = cp2->double_at(index2); 1072 if (d1 == d2) { 1073 return true; 1074 } 1075 } break; 1076 1077 case JVM_CONSTANT_Fieldref: 1078 case JVM_CONSTANT_InterfaceMethodref: 1079 case JVM_CONSTANT_Methodref: 1080 { 1081 int recur1 = uncached_klass_ref_index_at(index1); 1082 int recur2 = cp2->uncached_klass_ref_index_at(index2); 1083 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1084 if (match) { 1085 recur1 = uncached_name_and_type_ref_index_at(index1); 1086 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); 1087 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1088 if (match) { 1089 return true; 1090 } 1091 } 1092 } break; 1093 1094 case JVM_CONSTANT_Float: 1095 { 1096 jfloat f1 = float_at(index1); 1097 jfloat f2 = cp2->float_at(index2); 1098 if (f1 == f2) { 1099 return true; 1100 } 1101 } break; 1102 1103 case JVM_CONSTANT_Integer: 1104 { 1105 jint i1 = int_at(index1); 1106 jint i2 = cp2->int_at(index2); 1107 if (i1 == i2) { 1108 return true; 1109 } 1110 } break; 1111 1112 case JVM_CONSTANT_Long: 1113 { 1114 jlong l1 = long_at(index1); 1115 jlong l2 = cp2->long_at(index2); 1116 if (l1 == l2) { 1117 return true; 1118 } 1119 } break; 1120 1121 case JVM_CONSTANT_NameAndType: 1122 { 1123 int recur1 = name_ref_index_at(index1); 1124 int recur2 = cp2->name_ref_index_at(index2); 1125 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1126 if (match) { 1127 recur1 = signature_ref_index_at(index1); 1128 recur2 = cp2->signature_ref_index_at(index2); 1129 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1130 if (match) { 1131 return true; 1132 } 1133 } 1134 } break; 1135 1136 case JVM_CONSTANT_StringIndex: 1137 { 1138 int recur1 = string_index_at(index1); 1139 int recur2 = cp2->string_index_at(index2); 1140 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1141 if (match) { 1142 return true; 1143 } 1144 } break; 1145 1146 case JVM_CONSTANT_UnresolvedClass: 1147 { 1148 Symbol* k1 = klass_name_at(index1); 1149 Symbol* k2 = cp2->klass_name_at(index2); 1150 if (k1 == k2) { 1151 return true; 1152 } 1153 } break; 1154 1155 case JVM_CONSTANT_MethodType: 1156 { 1157 int k1 = method_type_index_at(index1); 1158 int k2 = cp2->method_type_index_at(index2); 1159 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1160 if (match) { 1161 return true; 1162 } 1163 } break; 1164 1165 case JVM_CONSTANT_MethodHandle: 1166 { 1167 int k1 = method_handle_ref_kind_at(index1); 1168 int k2 = cp2->method_handle_ref_kind_at(index2); 1169 if (k1 == k2) { 1170 int i1 = method_handle_index_at(index1); 1171 int i2 = cp2->method_handle_index_at(index2); 1172 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); 1173 if (match) { 1174 return true; 1175 } 1176 } 1177 } break; 1178 1179 case JVM_CONSTANT_InvokeDynamic: 1180 { 1181 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); 1182 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); 1183 int i1 = invoke_dynamic_bootstrap_specifier_index(index1); 1184 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); 1185 // separate statements and variables because CHECK_false is used 1186 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); 1187 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); 1188 return (match_entry && match_operand); 1189 } break; 1190 1191 case JVM_CONSTANT_String: 1192 { 1193 Symbol* s1 = unresolved_string_at(index1); 1194 Symbol* s2 = cp2->unresolved_string_at(index2); 1195 if (s1 == s2) { 1196 return true; 1197 } 1198 } break; 1199 1200 case JVM_CONSTANT_Utf8: 1201 { 1202 Symbol* s1 = symbol_at(index1); 1203 Symbol* s2 = cp2->symbol_at(index2); 1204 if (s1 == s2) { 1205 return true; 1206 } 1207 } break; 1208 1209 // Invalid is used as the tag for the second constant pool entry 1210 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1211 // not be seen by itself. 1212 case JVM_CONSTANT_Invalid: // fall through 1213 1214 default: 1215 ShouldNotReachHere(); 1216 break; 1217 } 1218 1219 return false; 1220 } // end compare_entry_to() 1221 1222 1223 // Resize the operands array with delta_len and delta_size. 1224 // Used in RedefineClasses for CP merge. 1225 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { 1226 int old_len = operand_array_length(operands()); 1227 int new_len = old_len + delta_len; 1228 int min_len = (delta_len > 0) ? old_len : new_len; 1229 1230 int old_size = operands()->length(); 1231 int new_size = old_size + delta_size; 1232 int min_size = (delta_size > 0) ? old_size : new_size; 1233 1234 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1235 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); 1236 1237 // Set index in the resized array for existing elements only 1238 for (int idx = 0; idx < min_len; idx++) { 1239 int offset = operand_offset_at(idx); // offset in original array 1240 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array 1241 } 1242 // Copy the bootstrap specifiers only 1243 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), 1244 new_ops->adr_at(2*new_len), 1245 (min_size - 2*min_len) * sizeof(u2)); 1246 // Explicitly deallocate old operands array. 1247 // Note, it is not needed for 7u backport. 1248 if ( operands() != NULL) { // the safety check 1249 MetadataFactory::free_array<u2>(loader_data, operands()); 1250 } 1251 set_operands(new_ops); 1252 } // end resize_operands() 1253 1254 1255 // Extend the operands array with the length and size of the ext_cp operands. 1256 // Used in RedefineClasses for CP merge. 1257 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) { 1258 int delta_len = operand_array_length(ext_cp->operands()); 1259 if (delta_len == 0) { 1260 return; // nothing to do 1261 } 1262 int delta_size = ext_cp->operands()->length(); 1263 1264 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); 1265 1266 if (operand_array_length(operands()) == 0) { 1267 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1268 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); 1269 // The first element index defines the offset of second part 1270 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array 1271 set_operands(new_ops); 1272 } else { 1273 resize_operands(delta_len, delta_size, CHECK); 1274 } 1275 1276 } // end extend_operands() 1277 1278 1279 // Shrink the operands array to a smaller array with new_len length. 1280 // Used in RedefineClasses for CP merge. 1281 void ConstantPool::shrink_operands(int new_len, TRAPS) { 1282 int old_len = operand_array_length(operands()); 1283 if (new_len == old_len) { 1284 return; // nothing to do 1285 } 1286 assert(new_len < old_len, "shrunken operands array must be smaller"); 1287 1288 int free_base = operand_next_offset_at(new_len - 1); 1289 int delta_len = new_len - old_len; 1290 int delta_size = 2*delta_len + free_base - operands()->length(); 1291 1292 resize_operands(delta_len, delta_size, CHECK); 1293 1294 } // end shrink_operands() 1295 1296 1297 void ConstantPool::copy_operands(const constantPoolHandle& from_cp, 1298 const constantPoolHandle& to_cp, 1299 TRAPS) { 1300 1301 int from_oplen = operand_array_length(from_cp->operands()); 1302 int old_oplen = operand_array_length(to_cp->operands()); 1303 if (from_oplen != 0) { 1304 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); 1305 // append my operands to the target's operands array 1306 if (old_oplen == 0) { 1307 // Can't just reuse from_cp's operand list because of deallocation issues 1308 int len = from_cp->operands()->length(); 1309 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); 1310 Copy::conjoint_memory_atomic( 1311 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); 1312 to_cp->set_operands(new_ops); 1313 } else { 1314 int old_len = to_cp->operands()->length(); 1315 int from_len = from_cp->operands()->length(); 1316 int old_off = old_oplen * sizeof(u2); 1317 int from_off = from_oplen * sizeof(u2); 1318 // Use the metaspace for the destination constant pool 1319 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); 1320 int fillp = 0, len = 0; 1321 // first part of dest 1322 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), 1323 new_operands->adr_at(fillp), 1324 (len = old_off) * sizeof(u2)); 1325 fillp += len; 1326 // first part of src 1327 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), 1328 new_operands->adr_at(fillp), 1329 (len = from_off) * sizeof(u2)); 1330 fillp += len; 1331 // second part of dest 1332 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), 1333 new_operands->adr_at(fillp), 1334 (len = old_len - old_off) * sizeof(u2)); 1335 fillp += len; 1336 // second part of src 1337 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), 1338 new_operands->adr_at(fillp), 1339 (len = from_len - from_off) * sizeof(u2)); 1340 fillp += len; 1341 assert(fillp == new_operands->length(), ""); 1342 1343 // Adjust indexes in the first part of the copied operands array. 1344 for (int j = 0; j < from_oplen; j++) { 1345 int offset = operand_offset_at(new_operands, old_oplen + j); 1346 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); 1347 offset += old_len; // every new tuple is preceded by old_len extra u2's 1348 operand_offset_at_put(new_operands, old_oplen + j, offset); 1349 } 1350 1351 // replace target operands array with combined array 1352 to_cp->set_operands(new_operands); 1353 } 1354 } 1355 } // end copy_operands() 1356 1357 1358 // Copy this constant pool's entries at start_i to end_i (inclusive) 1359 // to the constant pool to_cp's entries starting at to_i. A total of 1360 // (end_i - start_i) + 1 entries are copied. 1361 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i, 1362 const constantPoolHandle& to_cp, int to_i, TRAPS) { 1363 1364 1365 int dest_i = to_i; // leave original alone for debug purposes 1366 1367 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { 1368 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); 1369 1370 switch (from_cp->tag_at(src_i).value()) { 1371 case JVM_CONSTANT_Double: 1372 case JVM_CONSTANT_Long: 1373 // double and long take two constant pool entries 1374 src_i += 2; 1375 dest_i += 2; 1376 break; 1377 1378 default: 1379 // all others take one constant pool entry 1380 src_i++; 1381 dest_i++; 1382 break; 1383 } 1384 } 1385 copy_operands(from_cp, to_cp, CHECK); 1386 1387 } // end copy_cp_to_impl() 1388 1389 1390 // Copy this constant pool's entry at from_i to the constant pool 1391 // to_cp's entry at to_i. 1392 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i, 1393 const constantPoolHandle& to_cp, int to_i, 1394 TRAPS) { 1395 1396 int tag = from_cp->tag_at(from_i).value(); 1397 switch (tag) { 1398 case JVM_CONSTANT_ClassIndex: 1399 { 1400 jint ki = from_cp->klass_index_at(from_i); 1401 to_cp->klass_index_at_put(to_i, ki); 1402 } break; 1403 1404 case JVM_CONSTANT_Double: 1405 { 1406 jdouble d = from_cp->double_at(from_i); 1407 to_cp->double_at_put(to_i, d); 1408 // double takes two constant pool entries so init second entry's tag 1409 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1410 } break; 1411 1412 case JVM_CONSTANT_Fieldref: 1413 { 1414 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1415 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1416 to_cp->field_at_put(to_i, class_index, name_and_type_index); 1417 } break; 1418 1419 case JVM_CONSTANT_Float: 1420 { 1421 jfloat f = from_cp->float_at(from_i); 1422 to_cp->float_at_put(to_i, f); 1423 } break; 1424 1425 case JVM_CONSTANT_Integer: 1426 { 1427 jint i = from_cp->int_at(from_i); 1428 to_cp->int_at_put(to_i, i); 1429 } break; 1430 1431 case JVM_CONSTANT_InterfaceMethodref: 1432 { 1433 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1434 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1435 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); 1436 } break; 1437 1438 case JVM_CONSTANT_Long: 1439 { 1440 jlong l = from_cp->long_at(from_i); 1441 to_cp->long_at_put(to_i, l); 1442 // long takes two constant pool entries so init second entry's tag 1443 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1444 } break; 1445 1446 case JVM_CONSTANT_Methodref: 1447 { 1448 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1449 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1450 to_cp->method_at_put(to_i, class_index, name_and_type_index); 1451 } break; 1452 1453 case JVM_CONSTANT_NameAndType: 1454 { 1455 int name_ref_index = from_cp->name_ref_index_at(from_i); 1456 int signature_ref_index = from_cp->signature_ref_index_at(from_i); 1457 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); 1458 } break; 1459 1460 case JVM_CONSTANT_StringIndex: 1461 { 1462 jint si = from_cp->string_index_at(from_i); 1463 to_cp->string_index_at_put(to_i, si); 1464 } break; 1465 1466 case JVM_CONSTANT_Class: 1467 case JVM_CONSTANT_UnresolvedClass: 1468 case JVM_CONSTANT_UnresolvedClassInError: 1469 { 1470 // Revert to JVM_CONSTANT_ClassIndex 1471 int name_index = from_cp->klass_slot_at(from_i).name_index(); 1472 assert(from_cp->tag_at(name_index).is_symbol(), "sanity"); 1473 to_cp->klass_index_at_put(to_i, name_index); 1474 } break; 1475 1476 case JVM_CONSTANT_String: 1477 { 1478 Symbol* s = from_cp->unresolved_string_at(from_i); 1479 to_cp->unresolved_string_at_put(to_i, s); 1480 } break; 1481 1482 case JVM_CONSTANT_Utf8: 1483 { 1484 Symbol* s = from_cp->symbol_at(from_i); 1485 // Need to increase refcount, the old one will be thrown away and deferenced 1486 s->increment_refcount(); 1487 to_cp->symbol_at_put(to_i, s); 1488 } break; 1489 1490 case JVM_CONSTANT_MethodType: 1491 case JVM_CONSTANT_MethodTypeInError: 1492 { 1493 jint k = from_cp->method_type_index_at(from_i); 1494 to_cp->method_type_index_at_put(to_i, k); 1495 } break; 1496 1497 case JVM_CONSTANT_MethodHandle: 1498 case JVM_CONSTANT_MethodHandleInError: 1499 { 1500 int k1 = from_cp->method_handle_ref_kind_at(from_i); 1501 int k2 = from_cp->method_handle_index_at(from_i); 1502 to_cp->method_handle_index_at_put(to_i, k1, k2); 1503 } break; 1504 1505 case JVM_CONSTANT_InvokeDynamic: 1506 { 1507 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); 1508 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); 1509 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1510 to_cp->invoke_dynamic_at_put(to_i, k1, k2); 1511 } break; 1512 1513 // Invalid is used as the tag for the second constant pool entry 1514 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1515 // not be seen by itself. 1516 case JVM_CONSTANT_Invalid: // fall through 1517 1518 default: 1519 { 1520 ShouldNotReachHere(); 1521 } break; 1522 } 1523 } // end copy_entry_to() 1524 1525 // Search constant pool search_cp for an entry that matches this 1526 // constant pool's entry at pattern_i. Returns the index of a 1527 // matching entry or zero (0) if there is no matching entry. 1528 int ConstantPool::find_matching_entry(int pattern_i, 1529 const constantPoolHandle& search_cp, TRAPS) { 1530 1531 // index zero (0) is not used 1532 for (int i = 1; i < search_cp->length(); i++) { 1533 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); 1534 if (found) { 1535 return i; 1536 } 1537 } 1538 1539 return 0; // entry not found; return unused index zero (0) 1540 } // end find_matching_entry() 1541 1542 1543 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool 1544 // cp2's bootstrap specifier at idx2. 1545 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) { 1546 int k1 = operand_bootstrap_method_ref_index_at(idx1); 1547 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); 1548 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1549 1550 if (!match) { 1551 return false; 1552 } 1553 int argc = operand_argument_count_at(idx1); 1554 if (argc == cp2->operand_argument_count_at(idx2)) { 1555 for (int j = 0; j < argc; j++) { 1556 k1 = operand_argument_index_at(idx1, j); 1557 k2 = cp2->operand_argument_index_at(idx2, j); 1558 match = compare_entry_to(k1, cp2, k2, CHECK_false); 1559 if (!match) { 1560 return false; 1561 } 1562 } 1563 return true; // got through loop; all elements equal 1564 } 1565 return false; 1566 } // end compare_operand_to() 1567 1568 // Search constant pool search_cp for a bootstrap specifier that matches 1569 // this constant pool's bootstrap specifier at pattern_i index. 1570 // Return the index of a matching bootstrap specifier or (-1) if there is no match. 1571 int ConstantPool::find_matching_operand(int pattern_i, 1572 const constantPoolHandle& search_cp, int search_len, TRAPS) { 1573 for (int i = 0; i < search_len; i++) { 1574 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); 1575 if (found) { 1576 return i; 1577 } 1578 } 1579 return -1; // bootstrap specifier not found; return unused index (-1) 1580 } // end find_matching_operand() 1581 1582 1583 #ifndef PRODUCT 1584 1585 const char* ConstantPool::printable_name_at(int which) { 1586 1587 constantTag tag = tag_at(which); 1588 1589 if (tag.is_string()) { 1590 return string_at_noresolve(which); 1591 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 1592 return klass_name_at(which)->as_C_string(); 1593 } else if (tag.is_symbol()) { 1594 return symbol_at(which)->as_C_string(); 1595 } 1596 return ""; 1597 } 1598 1599 #endif // PRODUCT 1600 1601 1602 // JVMTI GetConstantPool support 1603 1604 // For debugging of constant pool 1605 const bool debug_cpool = false; 1606 1607 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) 1608 1609 static void print_cpool_bytes(jint cnt, u1 *bytes) { 1610 const char* WARN_MSG = "Must not be such entry!"; 1611 jint size = 0; 1612 u2 idx1, idx2; 1613 1614 for (jint idx = 1; idx < cnt; idx++) { 1615 jint ent_size = 0; 1616 u1 tag = *bytes++; 1617 size++; // count tag 1618 1619 printf("const #%03d, tag: %02d ", idx, tag); 1620 switch(tag) { 1621 case JVM_CONSTANT_Invalid: { 1622 printf("Invalid"); 1623 break; 1624 } 1625 case JVM_CONSTANT_Unicode: { 1626 printf("Unicode %s", WARN_MSG); 1627 break; 1628 } 1629 case JVM_CONSTANT_Utf8: { 1630 u2 len = Bytes::get_Java_u2(bytes); 1631 char str[128]; 1632 if (len > 127) { 1633 len = 127; 1634 } 1635 strncpy(str, (char *) (bytes+2), len); 1636 str[len] = '\0'; 1637 printf("Utf8 \"%s\"", str); 1638 ent_size = 2 + len; 1639 break; 1640 } 1641 case JVM_CONSTANT_Integer: { 1642 u4 val = Bytes::get_Java_u4(bytes); 1643 printf("int %d", *(int *) &val); 1644 ent_size = 4; 1645 break; 1646 } 1647 case JVM_CONSTANT_Float: { 1648 u4 val = Bytes::get_Java_u4(bytes); 1649 printf("float %5.3ff", *(float *) &val); 1650 ent_size = 4; 1651 break; 1652 } 1653 case JVM_CONSTANT_Long: { 1654 u8 val = Bytes::get_Java_u8(bytes); 1655 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val); 1656 ent_size = 8; 1657 idx++; // Long takes two cpool slots 1658 break; 1659 } 1660 case JVM_CONSTANT_Double: { 1661 u8 val = Bytes::get_Java_u8(bytes); 1662 printf("double %5.3fd", *(jdouble *)&val); 1663 ent_size = 8; 1664 idx++; // Double takes two cpool slots 1665 break; 1666 } 1667 case JVM_CONSTANT_Class: { 1668 idx1 = Bytes::get_Java_u2(bytes); 1669 printf("class #%03d", idx1); 1670 ent_size = 2; 1671 break; 1672 } 1673 case JVM_CONSTANT_String: { 1674 idx1 = Bytes::get_Java_u2(bytes); 1675 printf("String #%03d", idx1); 1676 ent_size = 2; 1677 break; 1678 } 1679 case JVM_CONSTANT_Fieldref: { 1680 idx1 = Bytes::get_Java_u2(bytes); 1681 idx2 = Bytes::get_Java_u2(bytes+2); 1682 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); 1683 ent_size = 4; 1684 break; 1685 } 1686 case JVM_CONSTANT_Methodref: { 1687 idx1 = Bytes::get_Java_u2(bytes); 1688 idx2 = Bytes::get_Java_u2(bytes+2); 1689 printf("Method #%03d, #%03d", idx1, idx2); 1690 ent_size = 4; 1691 break; 1692 } 1693 case JVM_CONSTANT_InterfaceMethodref: { 1694 idx1 = Bytes::get_Java_u2(bytes); 1695 idx2 = Bytes::get_Java_u2(bytes+2); 1696 printf("InterfMethod #%03d, #%03d", idx1, idx2); 1697 ent_size = 4; 1698 break; 1699 } 1700 case JVM_CONSTANT_NameAndType: { 1701 idx1 = Bytes::get_Java_u2(bytes); 1702 idx2 = Bytes::get_Java_u2(bytes+2); 1703 printf("NameAndType #%03d, #%03d", idx1, idx2); 1704 ent_size = 4; 1705 break; 1706 } 1707 case JVM_CONSTANT_ClassIndex: { 1708 printf("ClassIndex %s", WARN_MSG); 1709 break; 1710 } 1711 case JVM_CONSTANT_UnresolvedClass: { 1712 printf("UnresolvedClass: %s", WARN_MSG); 1713 break; 1714 } 1715 case JVM_CONSTANT_UnresolvedClassInError: { 1716 printf("UnresolvedClassInErr: %s", WARN_MSG); 1717 break; 1718 } 1719 case JVM_CONSTANT_StringIndex: { 1720 printf("StringIndex: %s", WARN_MSG); 1721 break; 1722 } 1723 } 1724 printf(";\n"); 1725 bytes += ent_size; 1726 size += ent_size; 1727 } 1728 printf("Cpool size: %d\n", size); 1729 fflush(0); 1730 return; 1731 } /* end print_cpool_bytes */ 1732 1733 1734 // Returns size of constant pool entry. 1735 jint ConstantPool::cpool_entry_size(jint idx) { 1736 switch(tag_at(idx).value()) { 1737 case JVM_CONSTANT_Invalid: 1738 case JVM_CONSTANT_Unicode: 1739 return 1; 1740 1741 case JVM_CONSTANT_Utf8: 1742 return 3 + symbol_at(idx)->utf8_length(); 1743 1744 case JVM_CONSTANT_Class: 1745 case JVM_CONSTANT_String: 1746 case JVM_CONSTANT_ClassIndex: 1747 case JVM_CONSTANT_UnresolvedClass: 1748 case JVM_CONSTANT_UnresolvedClassInError: 1749 case JVM_CONSTANT_StringIndex: 1750 case JVM_CONSTANT_MethodType: 1751 case JVM_CONSTANT_MethodTypeInError: 1752 return 3; 1753 1754 case JVM_CONSTANT_MethodHandle: 1755 case JVM_CONSTANT_MethodHandleInError: 1756 return 4; //tag, ref_kind, ref_index 1757 1758 case JVM_CONSTANT_Integer: 1759 case JVM_CONSTANT_Float: 1760 case JVM_CONSTANT_Fieldref: 1761 case JVM_CONSTANT_Methodref: 1762 case JVM_CONSTANT_InterfaceMethodref: 1763 case JVM_CONSTANT_NameAndType: 1764 return 5; 1765 1766 case JVM_CONSTANT_InvokeDynamic: 1767 // u1 tag, u2 bsm, u2 nt 1768 return 5; 1769 1770 case JVM_CONSTANT_Long: 1771 case JVM_CONSTANT_Double: 1772 return 9; 1773 } 1774 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); 1775 return 1; 1776 } /* end cpool_entry_size */ 1777 1778 1779 // SymbolHashMap is used to find a constant pool index from a string. 1780 // This function fills in SymbolHashMaps, one for utf8s and one for 1781 // class names, returns size of the cpool raw bytes. 1782 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, 1783 SymbolHashMap *classmap) { 1784 jint size = 0; 1785 1786 for (u2 idx = 1; idx < length(); idx++) { 1787 u2 tag = tag_at(idx).value(); 1788 size += cpool_entry_size(idx); 1789 1790 switch(tag) { 1791 case JVM_CONSTANT_Utf8: { 1792 Symbol* sym = symbol_at(idx); 1793 symmap->add_entry(sym, idx); 1794 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); 1795 break; 1796 } 1797 case JVM_CONSTANT_Class: 1798 case JVM_CONSTANT_UnresolvedClass: 1799 case JVM_CONSTANT_UnresolvedClassInError: { 1800 Symbol* sym = klass_name_at(idx); 1801 classmap->add_entry(sym, idx); 1802 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); 1803 break; 1804 } 1805 case JVM_CONSTANT_Long: 1806 case JVM_CONSTANT_Double: { 1807 idx++; // Both Long and Double take two cpool slots 1808 break; 1809 } 1810 } 1811 } 1812 return size; 1813 } /* end hash_utf8_entries_to */ 1814 1815 1816 // Copy cpool bytes. 1817 // Returns: 1818 // 0, in case of OutOfMemoryError 1819 // -1, in case of internal error 1820 // > 0, count of the raw cpool bytes that have been copied 1821 int ConstantPool::copy_cpool_bytes(int cpool_size, 1822 SymbolHashMap* tbl, 1823 unsigned char *bytes) { 1824 u2 idx1, idx2; 1825 jint size = 0; 1826 jint cnt = length(); 1827 unsigned char *start_bytes = bytes; 1828 1829 for (jint idx = 1; idx < cnt; idx++) { 1830 u1 tag = tag_at(idx).value(); 1831 jint ent_size = cpool_entry_size(idx); 1832 1833 assert(size + ent_size <= cpool_size, "Size mismatch"); 1834 1835 *bytes = tag; 1836 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag)); 1837 switch(tag) { 1838 case JVM_CONSTANT_Invalid: { 1839 DBG(printf("JVM_CONSTANT_Invalid")); 1840 break; 1841 } 1842 case JVM_CONSTANT_Unicode: { 1843 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); 1844 DBG(printf("JVM_CONSTANT_Unicode")); 1845 break; 1846 } 1847 case JVM_CONSTANT_Utf8: { 1848 Symbol* sym = symbol_at(idx); 1849 char* str = sym->as_utf8(); 1850 // Warning! It's crashing on x86 with len = sym->utf8_length() 1851 int len = (int) strlen(str); 1852 Bytes::put_Java_u2((address) (bytes+1), (u2) len); 1853 for (int i = 0; i < len; i++) { 1854 bytes[3+i] = (u1) str[i]; 1855 } 1856 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); 1857 break; 1858 } 1859 case JVM_CONSTANT_Integer: { 1860 jint val = int_at(idx); 1861 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1862 break; 1863 } 1864 case JVM_CONSTANT_Float: { 1865 jfloat val = float_at(idx); 1866 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 1867 break; 1868 } 1869 case JVM_CONSTANT_Long: { 1870 jlong val = long_at(idx); 1871 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1872 idx++; // Long takes two cpool slots 1873 break; 1874 } 1875 case JVM_CONSTANT_Double: { 1876 jdouble val = double_at(idx); 1877 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 1878 idx++; // Double takes two cpool slots 1879 break; 1880 } 1881 case JVM_CONSTANT_Class: 1882 case JVM_CONSTANT_UnresolvedClass: 1883 case JVM_CONSTANT_UnresolvedClassInError: { 1884 *bytes = JVM_CONSTANT_Class; 1885 Symbol* sym = klass_name_at(idx); 1886 idx1 = tbl->symbol_to_value(sym); 1887 assert(idx1 != 0, "Have not found a hashtable entry"); 1888 Bytes::put_Java_u2((address) (bytes+1), idx1); 1889 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); 1890 break; 1891 } 1892 case JVM_CONSTANT_String: { 1893 *bytes = JVM_CONSTANT_String; 1894 Symbol* sym = unresolved_string_at(idx); 1895 idx1 = tbl->symbol_to_value(sym); 1896 assert(idx1 != 0, "Have not found a hashtable entry"); 1897 Bytes::put_Java_u2((address) (bytes+1), idx1); 1898 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); 1899 break; 1900 } 1901 case JVM_CONSTANT_Fieldref: 1902 case JVM_CONSTANT_Methodref: 1903 case JVM_CONSTANT_InterfaceMethodref: { 1904 idx1 = uncached_klass_ref_index_at(idx); 1905 idx2 = uncached_name_and_type_ref_index_at(idx); 1906 Bytes::put_Java_u2((address) (bytes+1), idx1); 1907 Bytes::put_Java_u2((address) (bytes+3), idx2); 1908 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); 1909 break; 1910 } 1911 case JVM_CONSTANT_NameAndType: { 1912 idx1 = name_ref_index_at(idx); 1913 idx2 = signature_ref_index_at(idx); 1914 Bytes::put_Java_u2((address) (bytes+1), idx1); 1915 Bytes::put_Java_u2((address) (bytes+3), idx2); 1916 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); 1917 break; 1918 } 1919 case JVM_CONSTANT_ClassIndex: { 1920 *bytes = JVM_CONSTANT_Class; 1921 idx1 = klass_index_at(idx); 1922 Bytes::put_Java_u2((address) (bytes+1), idx1); 1923 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); 1924 break; 1925 } 1926 case JVM_CONSTANT_StringIndex: { 1927 *bytes = JVM_CONSTANT_String; 1928 idx1 = string_index_at(idx); 1929 Bytes::put_Java_u2((address) (bytes+1), idx1); 1930 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); 1931 break; 1932 } 1933 case JVM_CONSTANT_MethodHandle: 1934 case JVM_CONSTANT_MethodHandleInError: { 1935 *bytes = JVM_CONSTANT_MethodHandle; 1936 int kind = method_handle_ref_kind_at(idx); 1937 idx1 = method_handle_index_at(idx); 1938 *(bytes+1) = (unsigned char) kind; 1939 Bytes::put_Java_u2((address) (bytes+2), idx1); 1940 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); 1941 break; 1942 } 1943 case JVM_CONSTANT_MethodType: 1944 case JVM_CONSTANT_MethodTypeInError: { 1945 *bytes = JVM_CONSTANT_MethodType; 1946 idx1 = method_type_index_at(idx); 1947 Bytes::put_Java_u2((address) (bytes+1), idx1); 1948 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); 1949 break; 1950 } 1951 case JVM_CONSTANT_InvokeDynamic: { 1952 *bytes = tag; 1953 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 1954 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 1955 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); 1956 Bytes::put_Java_u2((address) (bytes+1), idx1); 1957 Bytes::put_Java_u2((address) (bytes+3), idx2); 1958 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); 1959 break; 1960 } 1961 } 1962 DBG(printf("\n")); 1963 bytes += ent_size; 1964 size += ent_size; 1965 } 1966 assert(size == cpool_size, "Size mismatch"); 1967 1968 // Keep temorarily for debugging until it's stable. 1969 DBG(print_cpool_bytes(cnt, start_bytes)); 1970 return (int)(bytes - start_bytes); 1971 } /* end copy_cpool_bytes */ 1972 1973 #undef DBG 1974 1975 1976 void ConstantPool::set_on_stack(const bool value) { 1977 if (value) { 1978 // Only record if it's not already set. 1979 if (!on_stack()) { 1980 assert(!is_shared(), "should always be set for shared constant pools"); 1981 _flags |= _on_stack; 1982 MetadataOnStackMark::record(this); 1983 } 1984 } else { 1985 // Clearing is done single-threadedly. 1986 if (!is_shared()) { 1987 _flags &= ~_on_stack; 1988 } 1989 } 1990 } 1991 1992 // JSR 292 support for patching constant pool oops after the class is linked and 1993 // the oop array for resolved references are created. 1994 // We can't do this during classfile parsing, which is how the other indexes are 1995 // patched. The other patches are applied early for some error checking 1996 // so only defer the pseudo_strings. 1997 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) { 1998 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused 1999 Handle patch = cp_patches->at(index); 2000 if (patch.not_null()) { 2001 assert (tag_at(index).is_string(), "should only be string left"); 2002 // Patching a string means pre-resolving it. 2003 // The spelling in the constant pool is ignored. 2004 // The constant reference may be any object whatever. 2005 // If it is not a real interned string, the constant is referred 2006 // to as a "pseudo-string", and must be presented to the CP 2007 // explicitly, because it may require scavenging. 2008 int obj_index = cp_to_object_index(index); 2009 pseudo_string_at_put(index, obj_index, patch()); 2010 DEBUG_ONLY(cp_patches->at_put(index, Handle());) 2011 } 2012 } 2013 #ifdef ASSERT 2014 // Ensure that all the patches have been used. 2015 for (int index = 0; index < cp_patches->length(); index++) { 2016 assert(cp_patches->at(index).is_null(), 2017 "Unused constant pool patch at %d in class file %s", 2018 index, 2019 pool_holder()->external_name()); 2020 } 2021 #endif // ASSERT 2022 } 2023 2024 #ifndef PRODUCT 2025 2026 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool 2027 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { 2028 guarantee(obj->is_constantPool(), "object must be constant pool"); 2029 constantPoolHandle cp(THREAD, (ConstantPool*)obj); 2030 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); 2031 2032 for (int i = 0; i< cp->length(); i++) { 2033 if (cp->tag_at(i).is_unresolved_klass()) { 2034 // This will force loading of the class 2035 Klass* klass = cp->klass_at(i, CHECK); 2036 if (klass->is_instance_klass()) { 2037 // Force initialization of class 2038 InstanceKlass::cast(klass)->initialize(CHECK); 2039 } 2040 } 2041 } 2042 } 2043 2044 #endif 2045 2046 2047 // Printing 2048 2049 void ConstantPool::print_on(outputStream* st) const { 2050 assert(is_constantPool(), "must be constantPool"); 2051 st->print_cr("%s", internal_name()); 2052 if (flags() != 0) { 2053 st->print(" - flags: 0x%x", flags()); 2054 if (has_preresolution()) st->print(" has_preresolution"); 2055 if (on_stack()) st->print(" on_stack"); 2056 st->cr(); 2057 } 2058 if (pool_holder() != NULL) { 2059 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder())); 2060 } 2061 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache())); 2062 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references())); 2063 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map())); 2064 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses())); 2065 2066 for (int index = 1; index < length(); index++) { // Index 0 is unused 2067 ((ConstantPool*)this)->print_entry_on(index, st); 2068 switch (tag_at(index).value()) { 2069 case JVM_CONSTANT_Long : 2070 case JVM_CONSTANT_Double : 2071 index++; // Skip entry following eigth-byte constant 2072 } 2073 2074 } 2075 st->cr(); 2076 } 2077 2078 // Print one constant pool entry 2079 void ConstantPool::print_entry_on(const int index, outputStream* st) { 2080 EXCEPTION_MARK; 2081 st->print(" - %3d : ", index); 2082 tag_at(index).print_on(st); 2083 st->print(" : "); 2084 switch (tag_at(index).value()) { 2085 case JVM_CONSTANT_Class : 2086 { Klass* k = klass_at(index, CATCH); 2087 guarantee(k != NULL, "need klass"); 2088 k->print_value_on(st); 2089 st->print(" {" PTR_FORMAT "}", p2i(k)); 2090 } 2091 break; 2092 case JVM_CONSTANT_Fieldref : 2093 case JVM_CONSTANT_Methodref : 2094 case JVM_CONSTANT_InterfaceMethodref : 2095 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); 2096 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); 2097 break; 2098 case JVM_CONSTANT_String : 2099 if (is_pseudo_string_at(index)) { 2100 oop anObj = pseudo_string_at(index); 2101 anObj->print_value_on(st); 2102 st->print(" {" PTR_FORMAT "}", p2i(anObj)); 2103 } else { 2104 unresolved_string_at(index)->print_value_on(st); 2105 } 2106 break; 2107 case JVM_CONSTANT_Integer : 2108 st->print("%d", int_at(index)); 2109 break; 2110 case JVM_CONSTANT_Float : 2111 st->print("%f", float_at(index)); 2112 break; 2113 case JVM_CONSTANT_Long : 2114 st->print_jlong(long_at(index)); 2115 break; 2116 case JVM_CONSTANT_Double : 2117 st->print("%lf", double_at(index)); 2118 break; 2119 case JVM_CONSTANT_NameAndType : 2120 st->print("name_index=%d", name_ref_index_at(index)); 2121 st->print(" signature_index=%d", signature_ref_index_at(index)); 2122 break; 2123 case JVM_CONSTANT_Utf8 : 2124 symbol_at(index)->print_value_on(st); 2125 break; 2126 case JVM_CONSTANT_ClassIndex: { 2127 int name_index = *int_at_addr(index); 2128 st->print("klass_index=%d ", name_index); 2129 symbol_at(name_index)->print_value_on(st); 2130 } 2131 break; 2132 case JVM_CONSTANT_UnresolvedClass : // fall-through 2133 case JVM_CONSTANT_UnresolvedClassInError: { 2134 CPKlassSlot kslot = klass_slot_at(index); 2135 int resolved_klass_index = kslot.resolved_klass_index(); 2136 int name_index = kslot.name_index(); 2137 assert(tag_at(name_index).is_symbol(), "sanity"); 2138 2139 Klass* klass = resolved_klasses()->at(resolved_klass_index); 2140 if (klass != NULL) { 2141 klass->print_value_on(st); 2142 } else { 2143 symbol_at(name_index)->print_value_on(st); 2144 } 2145 } 2146 break; 2147 case JVM_CONSTANT_MethodHandle : 2148 case JVM_CONSTANT_MethodHandleInError : 2149 st->print("ref_kind=%d", method_handle_ref_kind_at(index)); 2150 st->print(" ref_index=%d", method_handle_index_at(index)); 2151 break; 2152 case JVM_CONSTANT_MethodType : 2153 case JVM_CONSTANT_MethodTypeInError : 2154 st->print("signature_index=%d", method_type_index_at(index)); 2155 break; 2156 case JVM_CONSTANT_InvokeDynamic : 2157 { 2158 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); 2159 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); 2160 int argc = invoke_dynamic_argument_count_at(index); 2161 if (argc > 0) { 2162 for (int arg_i = 0; arg_i < argc; arg_i++) { 2163 int arg = invoke_dynamic_argument_index_at(index, arg_i); 2164 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 2165 } 2166 st->print("}"); 2167 } 2168 } 2169 break; 2170 default: 2171 ShouldNotReachHere(); 2172 break; 2173 } 2174 st->cr(); 2175 } 2176 2177 void ConstantPool::print_value_on(outputStream* st) const { 2178 assert(is_constantPool(), "must be constantPool"); 2179 st->print("constant pool [%d]", length()); 2180 if (has_preresolution()) st->print("/preresolution"); 2181 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); 2182 print_address_on(st); 2183 st->print(" for "); 2184 pool_holder()->print_value_on(st); 2185 if (pool_holder() != NULL) { 2186 bool extra = (pool_holder()->constants() != this); 2187 if (extra) st->print(" (extra)"); 2188 } 2189 if (cache() != NULL) { 2190 st->print(" cache=" PTR_FORMAT, p2i(cache())); 2191 } 2192 } 2193 2194 #if INCLUDE_SERVICES 2195 // Size Statistics 2196 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { 2197 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); 2198 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); 2199 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); 2200 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); 2201 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); 2202 2203 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + 2204 sz->_cp_refmap_bytes; 2205 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; 2206 } 2207 #endif // INCLUDE_SERVICES 2208 2209 // Verification 2210 2211 void ConstantPool::verify_on(outputStream* st) { 2212 guarantee(is_constantPool(), "object must be constant pool"); 2213 for (int i = 0; i< length(); i++) { 2214 constantTag tag = tag_at(i); 2215 if (tag.is_klass() || tag.is_unresolved_klass()) { 2216 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count"); 2217 } else if (tag.is_symbol()) { 2218 CPSlot entry = slot_at(i); 2219 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2220 } else if (tag.is_string()) { 2221 CPSlot entry = slot_at(i); 2222 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2223 } 2224 } 2225 if (cache() != NULL) { 2226 // Note: cache() can be NULL before a class is completely setup or 2227 // in temporary constant pools used during constant pool merging 2228 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); 2229 } 2230 if (pool_holder() != NULL) { 2231 // Note: pool_holder() can be NULL in temporary constant pools 2232 // used during constant pool merging 2233 guarantee(pool_holder()->is_klass(), "should be klass"); 2234 } 2235 } 2236 2237 2238 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { 2239 char *str = sym->as_utf8(); 2240 unsigned int hash = compute_hash(str, sym->utf8_length()); 2241 unsigned int index = hash % table_size(); 2242 2243 // check if already in map 2244 // we prefer the first entry since it is more likely to be what was used in 2245 // the class file 2246 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2247 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2248 if (en->hash() == hash && en->symbol() == sym) { 2249 return; // already there 2250 } 2251 } 2252 2253 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); 2254 entry->set_next(bucket(index)); 2255 _buckets[index].set_entry(entry); 2256 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2257 } 2258 2259 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { 2260 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); 2261 char *str = sym->as_utf8(); 2262 int len = sym->utf8_length(); 2263 unsigned int hash = SymbolHashMap::compute_hash(str, len); 2264 unsigned int index = hash % table_size(); 2265 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2266 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2267 if (en->hash() == hash && en->symbol() == sym) { 2268 return en; 2269 } 2270 } 2271 return NULL; 2272 }