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