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