1 /* 2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "classfile/classLoaderData.hpp" 28 #include "classfile/javaClasses.inline.hpp" 29 #include "classfile/metadataOnStackMark.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "classfile/vmSymbols.hpp" 33 #include "interpreter/bootstrapInfo.hpp" 34 #include "interpreter/linkResolver.hpp" 35 #include "memory/allocation.inline.hpp" 36 #include "memory/heapShared.hpp" 37 #include "memory/metadataFactory.hpp" 38 #include "memory/metaspaceClosure.hpp" 39 #include "memory/metaspaceShared.hpp" 40 #include "memory/oopFactory.hpp" 41 #include "memory/resourceArea.hpp" 42 #include "memory/universe.hpp" 43 #include "oops/array.hpp" 44 #include "oops/constantPool.inline.hpp" 45 #include "oops/cpCache.inline.hpp" 46 #include "oops/instanceKlass.hpp" 47 #include "oops/objArrayKlass.hpp" 48 #include "oops/objArrayOop.inline.hpp" 49 #include "oops/oop.inline.hpp" 50 #include "oops/typeArrayOop.inline.hpp" 51 #include "runtime/atomic.hpp" 52 #include "runtime/fieldType.hpp" 53 #include "runtime/handles.inline.hpp" 54 #include "runtime/init.hpp" 55 #include "runtime/javaCalls.hpp" 56 #include "runtime/signature.hpp" 57 #include "runtime/thread.inline.hpp" 58 #include "runtime/vframe.inline.hpp" 59 #include "utilities/copy.hpp" 60 61 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { 62 Array<u1>* tags = MetadataFactory::new_array<u1>(loader_data, length, 0, CHECK_NULL); 63 int size = ConstantPool::size(length); 64 return new (loader_data, size, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); 65 } 66 67 #ifdef ASSERT 68 69 // MetaspaceObj allocation invariant is calloc equivalent memory 70 // simple verification of this here (JVM_CONSTANT_Invalid == 0 ) 71 static bool tag_array_is_zero_initialized(Array<u1>* tags) { 72 assert(tags != NULL, "invariant"); 73 const int length = tags->length(); 74 for (int index = 0; index < length; ++index) { 75 if (JVM_CONSTANT_Invalid != tags->at(index)) { 76 return false; 77 } 78 } 79 return true; 80 } 81 82 #endif 83 84 ConstantPool::ConstantPool(Array<u1>* tags) : 85 _tags(tags), 86 _length(tags->length()) { 87 88 assert(_tags != NULL, "invariant"); 89 assert(tags->length() == _length, "invariant"); 90 assert(tag_array_is_zero_initialized(tags), "invariant"); 91 assert(0 == flags(), "invariant"); 92 assert(0 == version(), "invariant"); 93 assert(NULL == _pool_holder, "invariant"); 94 } 95 96 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { 97 if (cache() != NULL) { 98 MetadataFactory::free_metadata(loader_data, cache()); 99 set_cache(NULL); 100 } 101 102 MetadataFactory::free_array<Klass*>(loader_data, resolved_klasses()); 103 set_resolved_klasses(NULL); 104 105 MetadataFactory::free_array<jushort>(loader_data, operands()); 106 set_operands(NULL); 107 108 release_C_heap_structures(); 109 110 // free tag array 111 MetadataFactory::free_array<u1>(loader_data, tags()); 112 set_tags(NULL); 113 } 114 115 void ConstantPool::release_C_heap_structures() { 116 // walk constant pool and decrement symbol reference counts 117 unreference_symbols(); 118 } 119 120 void ConstantPool::metaspace_pointers_do(MetaspaceClosure* it) { 121 log_trace(cds)("Iter(ConstantPool): %p", this); 122 123 it->push(&_tags, MetaspaceClosure::_writable); 124 it->push(&_cache); 125 it->push(&_pool_holder); 126 it->push(&_operands); 127 it->push(&_resolved_klasses, MetaspaceClosure::_writable); 128 129 for (int i = 0; i < length(); i++) { 130 // The only MSO's embedded in the CP entries are Symbols: 131 // JVM_CONSTANT_String (normal and pseudo) 132 // JVM_CONSTANT_Utf8 133 constantTag ctag = tag_at(i); 134 if (ctag.is_string() || ctag.is_utf8()) { 135 it->push(symbol_at_addr(i)); 136 } 137 } 138 } 139 140 objArrayOop ConstantPool::resolved_references() const { 141 return (objArrayOop)_cache->resolved_references(); 142 } 143 144 // Called from outside constant pool resolution where a resolved_reference array 145 // may not be present. 146 objArrayOop ConstantPool::resolved_references_or_null() const { 147 if (_cache == NULL) { 148 return NULL; 149 } else { 150 return (objArrayOop)_cache->resolved_references(); 151 } 152 } 153 154 // Create resolved_references array and mapping array for original cp indexes 155 // The ldc bytecode was rewritten to have the resolved reference array index so need a way 156 // to map it back for resolving and some unlikely miscellaneous uses. 157 // The objects created by invokedynamic are appended to this list. 158 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, 159 const intStack& reference_map, 160 int constant_pool_map_length, 161 TRAPS) { 162 // Initialized the resolved object cache. 163 int map_length = reference_map.length(); 164 if (map_length > 0) { 165 // Only need mapping back to constant pool entries. The map isn't used for 166 // invokedynamic resolved_reference entries. For invokedynamic entries, 167 // the constant pool cache index has the mapping back to both the constant 168 // pool and to the resolved reference index. 169 if (constant_pool_map_length > 0) { 170 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK); 171 172 for (int i = 0; i < constant_pool_map_length; i++) { 173 int x = reference_map.at(i); 174 assert(x == (int)(jushort) x, "klass index is too big"); 175 om->at_put(i, (jushort)x); 176 } 177 set_reference_map(om); 178 } 179 180 // Create Java array for holding resolved strings, methodHandles, 181 // methodTypes, invokedynamic and invokehandle appendix objects, etc. 182 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 183 Handle refs_handle (THREAD, (oop)stom); // must handleize. 184 set_resolved_references(loader_data->add_handle(refs_handle)); 185 } 186 } 187 188 void ConstantPool::allocate_resolved_klasses(ClassLoaderData* loader_data, int num_klasses, TRAPS) { 189 // A ConstantPool can't possibly have 0xffff valid class entries, 190 // because entry #0 must be CONSTANT_Invalid, and each class entry must refer to a UTF8 191 // entry for the class's name. So at most we will have 0xfffe class entries. 192 // This allows us to use 0xffff (ConstantPool::_temp_resolved_klass_index) to indicate 193 // UnresolvedKlass entries that are temporarily created during class redefinition. 194 assert(num_klasses < CPKlassSlot::_temp_resolved_klass_index, "sanity"); 195 assert(resolved_klasses() == NULL, "sanity"); 196 Array<Klass*>* rk = MetadataFactory::new_array<Klass*>(loader_data, num_klasses, CHECK); 197 set_resolved_klasses(rk); 198 } 199 200 void ConstantPool::initialize_unresolved_klasses(ClassLoaderData* loader_data, TRAPS) { 201 int len = length(); 202 int num_klasses = 0; 203 for (int i = 1; i <len; i++) { 204 switch (tag_at(i).value()) { 205 case JVM_CONSTANT_ClassIndex: 206 { 207 const int class_index = klass_index_at(i); 208 unresolved_klass_at_put(i, class_index, num_klasses++); 209 } 210 break; 211 #ifndef PRODUCT 212 case JVM_CONSTANT_Class: 213 case JVM_CONSTANT_UnresolvedClass: 214 case JVM_CONSTANT_UnresolvedClassInError: 215 // All of these should have been reverted back to ClassIndex before calling 216 // this function. 217 ShouldNotReachHere(); 218 #endif 219 } 220 } 221 allocate_resolved_klasses(loader_data, num_klasses, THREAD); 222 } 223 224 // Unsafe anonymous class support: 225 void ConstantPool::klass_at_put(int class_index, int name_index, int resolved_klass_index, Klass* k, Symbol* name) { 226 assert(is_within_bounds(class_index), "index out of bounds"); 227 assert(is_within_bounds(name_index), "index out of bounds"); 228 assert((resolved_klass_index & 0xffff0000) == 0, "must be"); 229 *int_at_addr(class_index) = 230 build_int_from_shorts((jushort)resolved_klass_index, (jushort)name_index); 231 232 symbol_at_put(name_index, name); 233 name->increment_refcount(); 234 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index); 235 Atomic::release_store(adr, k); 236 237 // The interpreter assumes when the tag is stored, the klass is resolved 238 // and the Klass* non-NULL, so we need hardware store ordering here. 239 if (k != NULL) { 240 release_tag_at_put(class_index, JVM_CONSTANT_Class); 241 } else { 242 release_tag_at_put(class_index, JVM_CONSTANT_UnresolvedClass); 243 } 244 } 245 246 // Unsafe anonymous class support: 247 void ConstantPool::klass_at_put(int class_index, Klass* k) { 248 assert(k != NULL, "must be valid klass"); 249 CPKlassSlot kslot = klass_slot_at(class_index); 250 int resolved_klass_index = kslot.resolved_klass_index(); 251 Klass** adr = resolved_klasses()->adr_at(resolved_klass_index); 252 Atomic::release_store(adr, k); 253 254 // The interpreter assumes when the tag is stored, the klass is resolved 255 // and the Klass* non-NULL, so we need hardware store ordering here. 256 release_tag_at_put(class_index, JVM_CONSTANT_Class); 257 } 258 259 #if INCLUDE_CDS_JAVA_HEAP 260 // Archive the resolved references 261 void ConstantPool::archive_resolved_references(Thread* THREAD) { 262 if (_cache == NULL) { 263 return; // nothing to do 264 } 265 266 InstanceKlass *ik = pool_holder(); 267 if (!(ik->is_shared_boot_class() || ik->is_shared_platform_class() || 268 ik->is_shared_app_class())) { 269 // Archiving resolved references for classes from non-builtin loaders 270 // is not yet supported. 271 set_resolved_references(NULL); 272 return; 273 } 274 275 objArrayOop rr = resolved_references(); 276 Array<u2>* ref_map = reference_map(); 277 if (rr != NULL) { 278 int ref_map_len = ref_map == NULL ? 0 : ref_map->length(); 279 int rr_len = rr->length(); 280 for (int i = 0; i < rr_len; i++) { 281 oop p = rr->obj_at(i); 282 rr->obj_at_put(i, NULL); 283 if (p != NULL && i < ref_map_len) { 284 int index = object_to_cp_index(i); 285 if (tag_at(index).is_string()) { 286 oop op = StringTable::create_archived_string(p, THREAD); 287 // If the String object is not archived (possibly too large), 288 // NULL is returned. Also set it in the array, so we won't 289 // have a 'bad' reference in the archived resolved_reference 290 // array. 291 rr->obj_at_put(i, op); 292 } 293 } 294 } 295 296 oop archived = HeapShared::archive_heap_object(rr, THREAD); 297 // If the resolved references array is not archived (too large), 298 // the 'archived' object is NULL. No need to explicitly check 299 // the return value of archive_heap_object here. At runtime, the 300 // resolved references will be created using the normal process 301 // when there is no archived value. 302 _cache->set_archived_references(archived); 303 set_resolved_references(NULL); 304 } 305 } 306 307 void ConstantPool::resolve_class_constants(TRAPS) { 308 assert(DumpSharedSpaces, "used during dump time only"); 309 // The _cache may be NULL if the _pool_holder klass fails verification 310 // at dump time due to missing dependencies. 311 if (cache() == NULL || reference_map() == NULL) { 312 return; // nothing to do 313 } 314 315 constantPoolHandle cp(THREAD, this); 316 for (int index = 1; index < length(); index++) { // Index 0 is unused 317 if (tag_at(index).is_string() && !cp->is_pseudo_string_at(index)) { 318 int cache_index = cp->cp_to_object_index(index); 319 string_at_impl(cp, index, cache_index, CHECK); 320 } 321 } 322 } 323 #endif 324 325 // CDS support. Create a new resolved_references array. 326 void ConstantPool::restore_unshareable_info(TRAPS) { 327 assert(is_constantPool(), "ensure C++ vtable is restored"); 328 assert(on_stack(), "should always be set for shared constant pools"); 329 assert(is_shared(), "should always be set for shared constant pools"); 330 assert(_cache != NULL, "constant pool _cache should not be NULL"); 331 332 // Only create the new resolved references array if it hasn't been attempted before 333 if (resolved_references() != NULL) return; 334 335 // restore the C++ vtable from the shared archive 336 restore_vtable(); 337 338 if (SystemDictionary::Object_klass_loaded()) { 339 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 340 #if INCLUDE_CDS_JAVA_HEAP 341 if (HeapShared::open_archive_heap_region_mapped() && 342 _cache->archived_references() != NULL) { 343 oop archived = _cache->archived_references(); 344 // Create handle for the archived resolved reference array object 345 Handle refs_handle(THREAD, archived); 346 set_resolved_references(loader_data->add_handle(refs_handle)); 347 } else 348 #endif 349 { 350 // No mapped archived resolved reference array 351 // Recreate the object array and add to ClassLoaderData. 352 int map_length = resolved_reference_length(); 353 if (map_length > 0) { 354 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); 355 Handle refs_handle(THREAD, (oop)stom); // must handleize. 356 set_resolved_references(loader_data->add_handle(refs_handle)); 357 } 358 } 359 } 360 } 361 362 void ConstantPool::remove_unshareable_info() { 363 // Resolved references are not in the shared archive. 364 // Save the length for restoration. It is not necessarily the same length 365 // as reference_map.length() if invokedynamic is saved. It is needed when 366 // re-creating the resolved reference array if archived heap data cannot be map 367 // at runtime. 368 set_resolved_reference_length( 369 resolved_references() != NULL ? resolved_references()->length() : 0); 370 371 // If archiving heap objects is not allowed, clear the resolved references. 372 // Otherwise, it is cleared after the resolved references array is cached 373 // (see archive_resolved_references()). 374 // If DynamicDumpSharedSpaces is enabled, clear the resolved references also 375 // as java objects are not archived in the top layer. 376 if (!HeapShared::is_heap_object_archiving_allowed() || DynamicDumpSharedSpaces) { 377 set_resolved_references(NULL); 378 } 379 380 // Shared ConstantPools are in the RO region, so the _flags cannot be modified. 381 // The _on_stack flag is used to prevent ConstantPools from deallocation during 382 // class redefinition. Since shared ConstantPools cannot be deallocated anyway, 383 // we always set _on_stack to true to avoid having to change _flags during runtime. 384 _flags |= (_on_stack | _is_shared); 385 int num_klasses = 0; 386 for (int index = 1; index < length(); index++) { // Index 0 is unused 387 if (!DynamicDumpSharedSpaces) { 388 assert(!tag_at(index).is_unresolved_klass_in_error(), "This must not happen during static dump time"); 389 } else { 390 if (tag_at(index).is_unresolved_klass_in_error() || 391 tag_at(index).is_method_handle_in_error() || 392 tag_at(index).is_method_type_in_error() || 393 tag_at(index).is_dynamic_constant_in_error()) { 394 tag_at_put(index, JVM_CONSTANT_UnresolvedClass); 395 } 396 } 397 if (tag_at(index).is_klass()) { 398 // This class was resolved as a side effect of executing Java code 399 // during dump time. We need to restore it back to an UnresolvedClass, 400 // so that the proper class loading and initialization can happen 401 // at runtime. 402 CPKlassSlot kslot = klass_slot_at(index); 403 int resolved_klass_index = kslot.resolved_klass_index(); 404 int name_index = kslot.name_index(); 405 assert(tag_at(name_index).is_symbol(), "sanity"); 406 resolved_klasses()->at_put(resolved_klass_index, NULL); 407 tag_at_put(index, JVM_CONSTANT_UnresolvedClass); 408 assert(klass_name_at(index) == symbol_at(name_index), "sanity"); 409 } 410 } 411 if (cache() != NULL) { 412 cache()->remove_unshareable_info(); 413 } 414 } 415 416 int ConstantPool::cp_to_object_index(int cp_index) { 417 // this is harder don't do this so much. 418 int i = reference_map()->find(cp_index); 419 // We might not find the index for jsr292 call. 420 return (i < 0) ? _no_index_sentinel : i; 421 } 422 423 void ConstantPool::string_at_put(int which, int obj_index, oop str) { 424 resolved_references()->obj_at_put(obj_index, str); 425 } 426 427 void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, Klass* k) { 428 ResourceMark rm; 429 int line_number = -1; 430 const char * source_file = NULL; 431 if (JavaThread::current()->has_last_Java_frame()) { 432 // try to identify the method which called this function. 433 vframeStream vfst(JavaThread::current()); 434 if (!vfst.at_end()) { 435 line_number = vfst.method()->line_number_from_bci(vfst.bci()); 436 Symbol* s = vfst.method()->method_holder()->source_file_name(); 437 if (s != NULL) { 438 source_file = s->as_C_string(); 439 } 440 } 441 } 442 if (k != this_cp->pool_holder()) { 443 // only print something if the classes are different 444 if (source_file != NULL) { 445 log_debug(class, resolve)("%s %s %s:%d", 446 this_cp->pool_holder()->external_name(), 447 k->external_name(), source_file, line_number); 448 } else { 449 log_debug(class, resolve)("%s %s", 450 this_cp->pool_holder()->external_name(), 451 k->external_name()); 452 } 453 } 454 } 455 456 Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which, 457 bool save_resolution_error, TRAPS) { 458 assert(THREAD->is_Java_thread(), "must be a Java thread"); 459 JavaThread* javaThread = (JavaThread*)THREAD; 460 461 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. 462 // It is not safe to rely on the tag bit's here, since we don't have a lock, and 463 // the entry and tag is not updated atomicly. 464 CPKlassSlot kslot = this_cp->klass_slot_at(which); 465 int resolved_klass_index = kslot.resolved_klass_index(); 466 int name_index = kslot.name_index(); 467 assert(this_cp->tag_at(name_index).is_symbol(), "sanity"); 468 469 Klass* klass = this_cp->resolved_klasses()->at(resolved_klass_index); 470 if (klass != NULL) { 471 return klass; 472 } 473 474 // This tag doesn't change back to unresolved class unless at a safepoint. 475 if (this_cp->tag_at(which).is_unresolved_klass_in_error()) { 476 // The original attempt to resolve this constant pool entry failed so find the 477 // class of the original error and throw another error of the same class 478 // (JVMS 5.4.3). 479 // If there is a detail message, pass that detail message to the error. 480 // The JVMS does not strictly require us to duplicate the same detail message, 481 // or any internal exception fields such as cause or stacktrace. But since the 482 // detail message is often a class name or other literal string, we will repeat it 483 // if we can find it in the symbol table. 484 throw_resolution_error(this_cp, which, CHECK_NULL); 485 ShouldNotReachHere(); 486 } 487 488 Handle mirror_handle; 489 Symbol* name = this_cp->symbol_at(name_index); 490 Handle loader (THREAD, this_cp->pool_holder()->class_loader()); 491 Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain()); 492 493 Klass* k; 494 { 495 // Turn off the single stepping while doing class resolution 496 JvmtiHideSingleStepping jhss(javaThread); 497 k = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD); 498 } // JvmtiHideSingleStepping jhss(javaThread); 499 500 if (!HAS_PENDING_EXCEPTION) { 501 // preserve the resolved klass from unloading 502 mirror_handle = Handle(THREAD, k->java_mirror()); 503 // Do access check for klasses 504 verify_constant_pool_resolve(this_cp, k, THREAD); 505 } 506 507 // Failed to resolve class. We must record the errors so that subsequent attempts 508 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). 509 if (HAS_PENDING_EXCEPTION) { 510 if (save_resolution_error) { 511 save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL); 512 // If CHECK_NULL above doesn't return the exception, that means that 513 // some other thread has beaten us and has resolved the class. 514 // To preserve old behavior, we return the resolved class. 515 klass = this_cp->resolved_klasses()->at(resolved_klass_index); 516 assert(klass != NULL, "must be resolved if exception was cleared"); 517 return klass; 518 } else { 519 return NULL; // return the pending exception 520 } 521 } 522 523 // logging for class+resolve. 524 if (log_is_enabled(Debug, class, resolve)){ 525 trace_class_resolution(this_cp, k); 526 } 527 Klass** adr = this_cp->resolved_klasses()->adr_at(resolved_klass_index); 528 Atomic::release_store(adr, k); 529 // The interpreter assumes when the tag is stored, the klass is resolved 530 // and the Klass* stored in _resolved_klasses is non-NULL, so we need 531 // hardware store ordering here. 532 this_cp->release_tag_at_put(which, JVM_CONSTANT_Class); 533 return k; 534 } 535 536 537 // Does not update ConstantPool* - to avoid any exception throwing. Used 538 // by compiler and exception handling. Also used to avoid classloads for 539 // instanceof operations. Returns NULL if the class has not been loaded or 540 // if the verification of constant pool failed 541 Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) { 542 CPKlassSlot kslot = this_cp->klass_slot_at(which); 543 int resolved_klass_index = kslot.resolved_klass_index(); 544 int name_index = kslot.name_index(); 545 assert(this_cp->tag_at(name_index).is_symbol(), "sanity"); 546 547 Klass* k = this_cp->resolved_klasses()->at(resolved_klass_index); 548 if (k != NULL) { 549 return k; 550 } else { 551 Thread *thread = Thread::current(); 552 Symbol* name = this_cp->symbol_at(name_index); 553 oop loader = this_cp->pool_holder()->class_loader(); 554 oop protection_domain = this_cp->pool_holder()->protection_domain(); 555 Handle h_prot (thread, protection_domain); 556 Handle h_loader (thread, loader); 557 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); 558 559 // Avoid constant pool verification at a safepoint, which takes the Module_lock. 560 if (k != NULL && !SafepointSynchronize::is_at_safepoint()) { 561 // Make sure that resolving is legal 562 EXCEPTION_MARK; 563 // return NULL if verification fails 564 verify_constant_pool_resolve(this_cp, k, THREAD); 565 if (HAS_PENDING_EXCEPTION) { 566 CLEAR_PENDING_EXCEPTION; 567 return NULL; 568 } 569 return k; 570 } else { 571 return k; 572 } 573 } 574 } 575 576 Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool, 577 int which) { 578 if (cpool->cache() == NULL) return NULL; // nothing to load yet 579 int cache_index = decode_cpcache_index(which, true); 580 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { 581 // FIXME: should be an assert 582 log_debug(class, resolve)("bad operand %d in:", which); cpool->print(); 583 return NULL; 584 } 585 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 586 return e->method_if_resolved(cpool); 587 } 588 589 590 bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 591 if (cpool->cache() == NULL) return false; // nothing to load yet 592 int cache_index = decode_cpcache_index(which, true); 593 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 594 return e->has_appendix(); 595 } 596 597 oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { 598 if (cpool->cache() == NULL) return NULL; // nothing to load yet 599 int cache_index = decode_cpcache_index(which, true); 600 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 601 return e->appendix_if_resolved(cpool); 602 } 603 604 605 bool ConstantPool::has_local_signature_at_if_loaded(const constantPoolHandle& cpool, int which) { 606 if (cpool->cache() == NULL) return false; // nothing to load yet 607 int cache_index = decode_cpcache_index(which, true); 608 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); 609 return e->has_local_signature(); 610 } 611 612 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { 613 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 614 return symbol_at(name_index); 615 } 616 617 618 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { 619 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); 620 return symbol_at(signature_index); 621 } 622 623 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { 624 int i = which; 625 if (!uncached && cache() != NULL) { 626 if (ConstantPool::is_invokedynamic_index(which)) { 627 // Invokedynamic index is index into the constant pool cache 628 int pool_index = invokedynamic_bootstrap_ref_index_at(which); 629 pool_index = bootstrap_name_and_type_ref_index_at(pool_index); 630 assert(tag_at(pool_index).is_name_and_type(), ""); 631 return pool_index; 632 } 633 // change byte-ordering and go via cache 634 i = remap_instruction_operand_from_cache(which); 635 } else { 636 if (tag_at(which).has_bootstrap()) { 637 int pool_index = bootstrap_name_and_type_ref_index_at(which); 638 assert(tag_at(pool_index).is_name_and_type(), ""); 639 return pool_index; 640 } 641 } 642 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 643 assert(!tag_at(i).has_bootstrap(), "Must be handled above"); 644 jint ref_index = *int_at_addr(i); 645 return extract_high_short_from_int(ref_index); 646 } 647 648 constantTag ConstantPool::impl_tag_ref_at(int which, bool uncached) { 649 int pool_index = which; 650 if (!uncached && cache() != NULL) { 651 if (ConstantPool::is_invokedynamic_index(which)) { 652 // Invokedynamic index is index into resolved_references 653 pool_index = invokedynamic_bootstrap_ref_index_at(which); 654 } else { 655 // change byte-ordering and go via cache 656 pool_index = remap_instruction_operand_from_cache(which); 657 } 658 } 659 return tag_at(pool_index); 660 } 661 662 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { 663 guarantee(!ConstantPool::is_invokedynamic_index(which), 664 "an invokedynamic instruction does not have a klass"); 665 int i = which; 666 if (!uncached && cache() != NULL) { 667 // change byte-ordering and go via cache 668 i = remap_instruction_operand_from_cache(which); 669 } 670 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); 671 jint ref_index = *int_at_addr(i); 672 return extract_low_short_from_int(ref_index); 673 } 674 675 676 677 int ConstantPool::remap_instruction_operand_from_cache(int operand) { 678 int cpc_index = operand; 679 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); 680 assert((int)(u2)cpc_index == cpc_index, "clean u2"); 681 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); 682 return member_index; 683 } 684 685 686 void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, Klass* k, TRAPS) { 687 if (!(k->is_instance_klass() || k->is_objArray_klass())) { 688 return; // short cut, typeArray klass is always accessible 689 } 690 Klass* holder = this_cp->pool_holder(); 691 bool fold_type_to_class = true; 692 LinkResolver::check_klass_accessability(holder, k, fold_type_to_class, CHECK); 693 } 694 695 696 int ConstantPool::name_ref_index_at(int which_nt) { 697 jint ref_index = name_and_type_at(which_nt); 698 return extract_low_short_from_int(ref_index); 699 } 700 701 702 int ConstantPool::signature_ref_index_at(int which_nt) { 703 jint ref_index = name_and_type_at(which_nt); 704 return extract_high_short_from_int(ref_index); 705 } 706 707 708 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { 709 return klass_at(klass_ref_index_at(which), THREAD); 710 } 711 712 Symbol* ConstantPool::klass_name_at(int which) const { 713 return symbol_at(klass_slot_at(which).name_index()); 714 } 715 716 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { 717 jint ref_index = klass_ref_index_at(which); 718 return klass_at_noresolve(ref_index); 719 } 720 721 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { 722 jint ref_index = uncached_klass_ref_index_at(which); 723 return klass_at_noresolve(ref_index); 724 } 725 726 char* ConstantPool::string_at_noresolve(int which) { 727 return unresolved_string_at(which)->as_C_string(); 728 } 729 730 BasicType ConstantPool::basic_type_for_signature_at(int which) const { 731 return FieldType::basic_type(symbol_at(which)); 732 } 733 734 735 void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) { 736 for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused 737 if (this_cp->tag_at(index).is_string()) { 738 this_cp->string_at(index, CHECK); 739 } 740 } 741 } 742 743 Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) { 744 // Dig out the detailed message to reuse if possible 745 Symbol* message = java_lang_Throwable::detail_message(pending_exception); 746 if (message != NULL) { 747 return message; 748 } 749 750 // Return specific message for the tag 751 switch (tag.value()) { 752 case JVM_CONSTANT_UnresolvedClass: 753 // return the class name in the error message 754 message = this_cp->klass_name_at(which); 755 break; 756 case JVM_CONSTANT_MethodHandle: 757 // return the method handle name in the error message 758 message = this_cp->method_handle_name_ref_at(which); 759 break; 760 case JVM_CONSTANT_MethodType: 761 // return the method type signature in the error message 762 message = this_cp->method_type_signature_at(which); 763 break; 764 case JVM_CONSTANT_Dynamic: 765 // return the name of the condy in the error message 766 message = this_cp->uncached_name_ref_at(which); 767 break; 768 default: 769 ShouldNotReachHere(); 770 } 771 772 return message; 773 } 774 775 void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) { 776 Symbol* message = NULL; 777 Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message); 778 assert(error != NULL, "checking"); 779 CLEAR_PENDING_EXCEPTION; 780 if (message != NULL) { 781 ResourceMark rm; 782 THROW_MSG(error, message->as_C_string()); 783 } else { 784 THROW(error); 785 } 786 } 787 788 // If resolution for Class, Dynamic constant, MethodHandle or MethodType fails, save the 789 // exception in the resolution error table, so that the same exception is thrown again. 790 void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which, 791 constantTag tag, TRAPS) { 792 Symbol* error = PENDING_EXCEPTION->klass()->name(); 793 794 int error_tag = tag.error_value(); 795 796 if (!PENDING_EXCEPTION-> 797 is_a(SystemDictionary::LinkageError_klass())) { 798 // Just throw the exception and don't prevent these classes from 799 // being loaded due to virtual machine errors like StackOverflow 800 // and OutOfMemoryError, etc, or if the thread was hit by stop() 801 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) 802 } else if (this_cp->tag_at(which).value() != error_tag) { 803 Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION); 804 SystemDictionary::add_resolution_error(this_cp, which, error, message); 805 // CAS in the tag. If a thread beat us to registering this error that's fine. 806 // If another thread resolved the reference, this is a race condition. This 807 // thread may have had a security manager or something temporary. 808 // This doesn't deterministically get an error. So why do we save this? 809 // We save this because jvmti can add classes to the bootclass path after 810 // this error, so it needs to get the same error if the error is first. 811 jbyte old_tag = Atomic::cmpxchg((jbyte*)this_cp->tag_addr_at(which), 812 (jbyte)tag.value(), 813 (jbyte)error_tag); 814 if (old_tag != error_tag && old_tag != tag.value()) { 815 // MethodHandles and MethodType doesn't change to resolved version. 816 assert(this_cp->tag_at(which).is_klass(), "Wrong tag value"); 817 // Forget the exception and use the resolved class. 818 CLEAR_PENDING_EXCEPTION; 819 } 820 } else { 821 // some other thread put this in error state 822 throw_resolution_error(this_cp, which, CHECK); 823 } 824 } 825 826 constantTag ConstantPool::constant_tag_at(int which) { 827 constantTag tag = tag_at(which); 828 if (tag.is_dynamic_constant() || 829 tag.is_dynamic_constant_in_error()) { 830 BasicType bt = basic_type_for_constant_at(which); 831 // dynamic constant could return an array, treat as object 832 return constantTag::ofBasicType(is_reference_type(bt) ? T_OBJECT : bt); 833 } 834 return tag; 835 } 836 837 BasicType ConstantPool::basic_type_for_constant_at(int which) { 838 constantTag tag = tag_at(which); 839 if (tag.is_dynamic_constant() || 840 tag.is_dynamic_constant_in_error()) { 841 // have to look at the signature for this one 842 Symbol* constant_type = uncached_signature_ref_at(which); 843 return FieldType::basic_type(constant_type); 844 } 845 return tag.basic_type(); 846 } 847 848 // Called to resolve constants in the constant pool and return an oop. 849 // Some constant pool entries cache their resolved oop. This is also 850 // called to create oops from constants to use in arguments for invokedynamic 851 oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, 852 int index, int cache_index, 853 bool* status_return, TRAPS) { 854 oop result_oop = NULL; 855 Handle throw_exception; 856 857 if (cache_index == _possible_index_sentinel) { 858 // It is possible that this constant is one which is cached in the objects. 859 // We'll do a linear search. This should be OK because this usage is rare. 860 // FIXME: If bootstrap specifiers stress this code, consider putting in 861 // a reverse index. Binary search over a short array should do it. 862 assert(index > 0, "valid index"); 863 cache_index = this_cp->cp_to_object_index(index); 864 } 865 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); 866 assert(index == _no_index_sentinel || index >= 0, ""); 867 868 if (cache_index >= 0) { 869 result_oop = this_cp->resolved_references()->obj_at(cache_index); 870 if (result_oop != NULL) { 871 if (result_oop == Universe::the_null_sentinel()) { 872 DEBUG_ONLY(int temp_index = (index >= 0 ? index : this_cp->object_to_cp_index(cache_index))); 873 assert(this_cp->tag_at(temp_index).is_dynamic_constant(), "only condy uses the null sentinel"); 874 result_oop = NULL; 875 } 876 if (status_return != NULL) (*status_return) = true; 877 return result_oop; 878 // That was easy... 879 } 880 index = this_cp->object_to_cp_index(cache_index); 881 } 882 883 jvalue prim_value; // temp used only in a few cases below 884 885 constantTag tag = this_cp->tag_at(index); 886 887 if (status_return != NULL) { 888 // don't trigger resolution if the constant might need it 889 switch (tag.value()) { 890 case JVM_CONSTANT_Class: 891 { 892 CPKlassSlot kslot = this_cp->klass_slot_at(index); 893 int resolved_klass_index = kslot.resolved_klass_index(); 894 if (this_cp->resolved_klasses()->at(resolved_klass_index) == NULL) { 895 (*status_return) = false; 896 return NULL; 897 } 898 // the klass is waiting in the CP; go get it 899 break; 900 } 901 case JVM_CONSTANT_String: 902 case JVM_CONSTANT_Integer: 903 case JVM_CONSTANT_Float: 904 case JVM_CONSTANT_Long: 905 case JVM_CONSTANT_Double: 906 // these guys trigger OOM at worst 907 break; 908 default: 909 (*status_return) = false; 910 return NULL; 911 } 912 // from now on there is either success or an OOME 913 (*status_return) = true; 914 } 915 916 switch (tag.value()) { 917 918 case JVM_CONSTANT_UnresolvedClass: 919 case JVM_CONSTANT_UnresolvedClassInError: 920 case JVM_CONSTANT_Class: 921 { 922 assert(cache_index == _no_index_sentinel, "should not have been set"); 923 Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL); 924 // ldc wants the java mirror. 925 result_oop = resolved->java_mirror(); 926 break; 927 } 928 929 case JVM_CONSTANT_Dynamic: 930 { 931 // Resolve the Dynamically-Computed constant to invoke the BSM in order to obtain the resulting oop. 932 BootstrapInfo bootstrap_specifier(this_cp, index); 933 934 // The initial step in resolving an unresolved symbolic reference to a 935 // dynamically-computed constant is to resolve the symbolic reference to a 936 // method handle which will be the bootstrap method for the dynamically-computed 937 // constant. If resolution of the java.lang.invoke.MethodHandle for the bootstrap 938 // method fails, then a MethodHandleInError is stored at the corresponding 939 // bootstrap method's CP index for the CONSTANT_MethodHandle_info. No need to 940 // set a DynamicConstantInError here since any subsequent use of this 941 // bootstrap method will encounter the resolution of MethodHandleInError. 942 // Both the first, (resolution of the BSM and its static arguments), and the second tasks, 943 // (invocation of the BSM), of JVMS Section 5.4.3.6 occur within invoke_bootstrap_method() 944 // for the bootstrap_specifier created above. 945 SystemDictionary::invoke_bootstrap_method(bootstrap_specifier, THREAD); 946 Exceptions::wrap_dynamic_exception(THREAD); 947 if (HAS_PENDING_EXCEPTION) { 948 // Resolution failure of the dynamically-computed constant, save_and_throw_exception 949 // will check for a LinkageError and store a DynamicConstantInError. 950 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 951 } 952 result_oop = bootstrap_specifier.resolved_value()(); 953 BasicType type = FieldType::basic_type(bootstrap_specifier.signature()); 954 if (!is_reference_type(type)) { 955 // Make sure the primitive value is properly boxed. 956 // This is a JDK responsibility. 957 const char* fail = NULL; 958 if (result_oop == NULL) { 959 fail = "null result instead of box"; 960 } else if (!is_java_primitive(type)) { 961 // FIXME: support value types via unboxing 962 fail = "can only handle references and primitives"; 963 } else if (!java_lang_boxing_object::is_instance(result_oop, type)) { 964 fail = "primitive is not properly boxed"; 965 } 966 if (fail != NULL) { 967 // Since this exception is not a LinkageError, throw exception 968 // but do not save a DynamicInError resolution result. 969 // See section 5.4.3 of the VM spec. 970 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), fail); 971 } 972 } 973 974 if (TraceMethodHandles) { 975 bootstrap_specifier.print_msg_on(tty, "resolve_constant_at_impl"); 976 } 977 break; 978 } 979 980 case JVM_CONSTANT_String: 981 assert(cache_index != _no_index_sentinel, "should have been set"); 982 if (this_cp->is_pseudo_string_at(index)) { 983 result_oop = this_cp->pseudo_string_at(index, cache_index); 984 break; 985 } 986 result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL); 987 break; 988 989 case JVM_CONSTANT_DynamicInError: 990 case JVM_CONSTANT_MethodHandleInError: 991 case JVM_CONSTANT_MethodTypeInError: 992 { 993 throw_resolution_error(this_cp, index, CHECK_NULL); 994 break; 995 } 996 997 case JVM_CONSTANT_MethodHandle: 998 { 999 int ref_kind = this_cp->method_handle_ref_kind_at(index); 1000 int callee_index = this_cp->method_handle_klass_index_at(index); 1001 Symbol* name = this_cp->method_handle_name_ref_at(index); 1002 Symbol* signature = this_cp->method_handle_signature_ref_at(index); 1003 constantTag m_tag = this_cp->tag_at(this_cp->method_handle_index_at(index)); 1004 { ResourceMark rm(THREAD); 1005 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", 1006 ref_kind, index, this_cp->method_handle_index_at(index), 1007 callee_index, name->as_C_string(), signature->as_C_string()); 1008 } 1009 1010 Klass* callee = klass_at_impl(this_cp, callee_index, true, CHECK_NULL); 1011 1012 // Check constant pool method consistency 1013 if ((callee->is_interface() && m_tag.is_method()) || 1014 ((!callee->is_interface() && m_tag.is_interface_method()))) { 1015 ResourceMark rm(THREAD); 1016 stringStream ss; 1017 ss.print("Inconsistent constant pool data in classfile for class %s. " 1018 "Method '", callee->name()->as_C_string()); 1019 signature->print_as_signature_external_return_type(&ss); 1020 ss.print(" %s(", name->as_C_string()); 1021 signature->print_as_signature_external_parameters(&ss); 1022 ss.print(")' at index %d is %s and should be %s", 1023 index, 1024 callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef", 1025 callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef"); 1026 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string()); 1027 } 1028 1029 Klass* klass = this_cp->pool_holder(); 1030 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, 1031 callee, name, signature, 1032 THREAD); 1033 result_oop = value(); 1034 if (HAS_PENDING_EXCEPTION) { 1035 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 1036 } 1037 break; 1038 } 1039 1040 case JVM_CONSTANT_MethodType: 1041 { 1042 Symbol* signature = this_cp->method_type_signature_at(index); 1043 { ResourceMark rm(THREAD); 1044 log_debug(class, resolve)("resolve JVM_CONSTANT_MethodType [%d/%d] %s", 1045 index, this_cp->method_type_index_at(index), 1046 signature->as_C_string()); 1047 } 1048 Klass* klass = this_cp->pool_holder(); 1049 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); 1050 result_oop = value(); 1051 if (HAS_PENDING_EXCEPTION) { 1052 save_and_throw_exception(this_cp, index, tag, CHECK_NULL); 1053 } 1054 break; 1055 } 1056 1057 case JVM_CONSTANT_Integer: 1058 assert(cache_index == _no_index_sentinel, "should not have been set"); 1059 prim_value.i = this_cp->int_at(index); 1060 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); 1061 break; 1062 1063 case JVM_CONSTANT_Float: 1064 assert(cache_index == _no_index_sentinel, "should not have been set"); 1065 prim_value.f = this_cp->float_at(index); 1066 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); 1067 break; 1068 1069 case JVM_CONSTANT_Long: 1070 assert(cache_index == _no_index_sentinel, "should not have been set"); 1071 prim_value.j = this_cp->long_at(index); 1072 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); 1073 break; 1074 1075 case JVM_CONSTANT_Double: 1076 assert(cache_index == _no_index_sentinel, "should not have been set"); 1077 prim_value.d = this_cp->double_at(index); 1078 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); 1079 break; 1080 1081 default: 1082 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", 1083 this_cp(), index, cache_index, tag.value())); 1084 assert(false, "unexpected constant tag"); 1085 break; 1086 } 1087 1088 if (cache_index >= 0) { 1089 // Benign race condition: resolved_references may already be filled in. 1090 // The important thing here is that all threads pick up the same result. 1091 // It doesn't matter which racing thread wins, as long as only one 1092 // result is used by all threads, and all future queries. 1093 oop new_result = (result_oop == NULL ? Universe::the_null_sentinel() : result_oop); 1094 oop old_result = this_cp->resolved_references() 1095 ->atomic_compare_exchange_oop(cache_index, new_result, NULL); 1096 if (old_result == NULL) { 1097 return result_oop; // was installed 1098 } else { 1099 // Return the winning thread's result. This can be different than 1100 // the result here for MethodHandles. 1101 if (old_result == Universe::the_null_sentinel()) 1102 old_result = NULL; 1103 return old_result; 1104 } 1105 } else { 1106 assert(result_oop != Universe::the_null_sentinel(), ""); 1107 return result_oop; 1108 } 1109 } 1110 1111 oop ConstantPool::uncached_string_at(int which, TRAPS) { 1112 Symbol* sym = unresolved_string_at(which); 1113 oop str = StringTable::intern(sym, CHECK_(NULL)); 1114 assert(java_lang_String::is_instance(str), "must be string"); 1115 return str; 1116 } 1117 1118 void ConstantPool::copy_bootstrap_arguments_at_impl(const constantPoolHandle& this_cp, int index, 1119 int start_arg, int end_arg, 1120 objArrayHandle info, int pos, 1121 bool must_resolve, Handle if_not_available, 1122 TRAPS) { 1123 int argc; 1124 int limit = pos + end_arg - start_arg; 1125 // checks: index in range [0..this_cp->length), 1126 // tag at index, start..end in range [0..argc], 1127 // info array non-null, pos..limit in [0..info.length] 1128 if ((0 >= index || index >= this_cp->length()) || 1129 !(this_cp->tag_at(index).is_invoke_dynamic() || 1130 this_cp->tag_at(index).is_dynamic_constant()) || 1131 (0 > start_arg || start_arg > end_arg) || 1132 (end_arg > (argc = this_cp->bootstrap_argument_count_at(index))) || 1133 (0 > pos || pos > limit) || 1134 (info.is_null() || limit > info->length())) { 1135 // An index or something else went wrong; throw an error. 1136 // Since this is an internal API, we don't expect this, 1137 // so we don't bother to craft a nice message. 1138 THROW_MSG(vmSymbols::java_lang_LinkageError(), "bad BSM argument access"); 1139 } 1140 // now we can loop safely 1141 int info_i = pos; 1142 for (int i = start_arg; i < end_arg; i++) { 1143 int arg_index = this_cp->bootstrap_argument_index_at(index, i); 1144 oop arg_oop; 1145 if (must_resolve) { 1146 arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK); 1147 } else { 1148 bool found_it = false; 1149 arg_oop = this_cp->find_cached_constant_at(arg_index, found_it, CHECK); 1150 if (!found_it) arg_oop = if_not_available(); 1151 } 1152 info->obj_at_put(info_i++, arg_oop); 1153 } 1154 } 1155 1156 oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) { 1157 // If the string has already been interned, this entry will be non-null 1158 oop str = this_cp->resolved_references()->obj_at(obj_index); 1159 assert(str != Universe::the_null_sentinel(), ""); 1160 if (str != NULL) return str; 1161 Symbol* sym = this_cp->unresolved_string_at(which); 1162 str = StringTable::intern(sym, CHECK_(NULL)); 1163 this_cp->string_at_put(which, obj_index, str); 1164 assert(java_lang_String::is_instance(str), "must be string"); 1165 return str; 1166 } 1167 1168 1169 bool ConstantPool::klass_name_at_matches(const InstanceKlass* k, int which) { 1170 // Names are interned, so we can compare Symbol*s directly 1171 Symbol* cp_name = klass_name_at(which); 1172 return (cp_name == k->name()); 1173 } 1174 1175 1176 // Iterate over symbols and decrement ones which are Symbol*s 1177 // This is done during GC. 1178 // Only decrement the UTF8 symbols. Strings point to 1179 // these symbols but didn't increment the reference count. 1180 void ConstantPool::unreference_symbols() { 1181 for (int index = 1; index < length(); index++) { // Index 0 is unused 1182 constantTag tag = tag_at(index); 1183 if (tag.is_symbol()) { 1184 symbol_at(index)->decrement_refcount(); 1185 } 1186 } 1187 } 1188 1189 1190 // Compare this constant pool's entry at index1 to the constant pool 1191 // cp2's entry at index2. 1192 bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2, 1193 int index2, TRAPS) { 1194 1195 // The error tags are equivalent to non-error tags when comparing 1196 jbyte t1 = tag_at(index1).non_error_value(); 1197 jbyte t2 = cp2->tag_at(index2).non_error_value(); 1198 1199 if (t1 != t2) { 1200 // Not the same entry type so there is nothing else to check. Note 1201 // that this style of checking will consider resolved/unresolved 1202 // class pairs as different. 1203 // From the ConstantPool* API point of view, this is correct 1204 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this 1205 // plays out in the context of ConstantPool* merging. 1206 return false; 1207 } 1208 1209 switch (t1) { 1210 case JVM_CONSTANT_Class: 1211 { 1212 Klass* k1 = klass_at(index1, CHECK_false); 1213 Klass* k2 = cp2->klass_at(index2, CHECK_false); 1214 if (k1 == k2) { 1215 return true; 1216 } 1217 } break; 1218 1219 case JVM_CONSTANT_ClassIndex: 1220 { 1221 int recur1 = klass_index_at(index1); 1222 int recur2 = cp2->klass_index_at(index2); 1223 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1224 if (match) { 1225 return true; 1226 } 1227 } break; 1228 1229 case JVM_CONSTANT_Double: 1230 { 1231 jdouble d1 = double_at(index1); 1232 jdouble d2 = cp2->double_at(index2); 1233 if (d1 == d2) { 1234 return true; 1235 } 1236 } break; 1237 1238 case JVM_CONSTANT_Fieldref: 1239 case JVM_CONSTANT_InterfaceMethodref: 1240 case JVM_CONSTANT_Methodref: 1241 { 1242 int recur1 = uncached_klass_ref_index_at(index1); 1243 int recur2 = cp2->uncached_klass_ref_index_at(index2); 1244 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1245 if (match) { 1246 recur1 = uncached_name_and_type_ref_index_at(index1); 1247 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); 1248 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1249 if (match) { 1250 return true; 1251 } 1252 } 1253 } break; 1254 1255 case JVM_CONSTANT_Float: 1256 { 1257 jfloat f1 = float_at(index1); 1258 jfloat f2 = cp2->float_at(index2); 1259 if (f1 == f2) { 1260 return true; 1261 } 1262 } break; 1263 1264 case JVM_CONSTANT_Integer: 1265 { 1266 jint i1 = int_at(index1); 1267 jint i2 = cp2->int_at(index2); 1268 if (i1 == i2) { 1269 return true; 1270 } 1271 } break; 1272 1273 case JVM_CONSTANT_Long: 1274 { 1275 jlong l1 = long_at(index1); 1276 jlong l2 = cp2->long_at(index2); 1277 if (l1 == l2) { 1278 return true; 1279 } 1280 } break; 1281 1282 case JVM_CONSTANT_NameAndType: 1283 { 1284 int recur1 = name_ref_index_at(index1); 1285 int recur2 = cp2->name_ref_index_at(index2); 1286 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1287 if (match) { 1288 recur1 = signature_ref_index_at(index1); 1289 recur2 = cp2->signature_ref_index_at(index2); 1290 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1291 if (match) { 1292 return true; 1293 } 1294 } 1295 } break; 1296 1297 case JVM_CONSTANT_StringIndex: 1298 { 1299 int recur1 = string_index_at(index1); 1300 int recur2 = cp2->string_index_at(index2); 1301 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); 1302 if (match) { 1303 return true; 1304 } 1305 } break; 1306 1307 case JVM_CONSTANT_UnresolvedClass: 1308 { 1309 Symbol* k1 = klass_name_at(index1); 1310 Symbol* k2 = cp2->klass_name_at(index2); 1311 if (k1 == k2) { 1312 return true; 1313 } 1314 } break; 1315 1316 case JVM_CONSTANT_MethodType: 1317 { 1318 int k1 = method_type_index_at(index1); 1319 int k2 = cp2->method_type_index_at(index2); 1320 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1321 if (match) { 1322 return true; 1323 } 1324 } break; 1325 1326 case JVM_CONSTANT_MethodHandle: 1327 { 1328 int k1 = method_handle_ref_kind_at(index1); 1329 int k2 = cp2->method_handle_ref_kind_at(index2); 1330 if (k1 == k2) { 1331 int i1 = method_handle_index_at(index1); 1332 int i2 = cp2->method_handle_index_at(index2); 1333 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); 1334 if (match) { 1335 return true; 1336 } 1337 } 1338 } break; 1339 1340 case JVM_CONSTANT_Dynamic: 1341 { 1342 int k1 = bootstrap_name_and_type_ref_index_at(index1); 1343 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2); 1344 int i1 = bootstrap_methods_attribute_index(index1); 1345 int i2 = cp2->bootstrap_methods_attribute_index(index2); 1346 // separate statements and variables because CHECK_false is used 1347 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); 1348 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); 1349 return (match_entry && match_operand); 1350 } break; 1351 1352 case JVM_CONSTANT_InvokeDynamic: 1353 { 1354 int k1 = bootstrap_name_and_type_ref_index_at(index1); 1355 int k2 = cp2->bootstrap_name_and_type_ref_index_at(index2); 1356 int i1 = bootstrap_methods_attribute_index(index1); 1357 int i2 = cp2->bootstrap_methods_attribute_index(index2); 1358 // separate statements and variables because CHECK_false is used 1359 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); 1360 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); 1361 return (match_entry && match_operand); 1362 } break; 1363 1364 case JVM_CONSTANT_String: 1365 { 1366 Symbol* s1 = unresolved_string_at(index1); 1367 Symbol* s2 = cp2->unresolved_string_at(index2); 1368 if (s1 == s2) { 1369 return true; 1370 } 1371 } break; 1372 1373 case JVM_CONSTANT_Utf8: 1374 { 1375 Symbol* s1 = symbol_at(index1); 1376 Symbol* s2 = cp2->symbol_at(index2); 1377 if (s1 == s2) { 1378 return true; 1379 } 1380 } break; 1381 1382 // Invalid is used as the tag for the second constant pool entry 1383 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1384 // not be seen by itself. 1385 case JVM_CONSTANT_Invalid: // fall through 1386 1387 default: 1388 ShouldNotReachHere(); 1389 break; 1390 } 1391 1392 return false; 1393 } // end compare_entry_to() 1394 1395 1396 // Resize the operands array with delta_len and delta_size. 1397 // Used in RedefineClasses for CP merge. 1398 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { 1399 int old_len = operand_array_length(operands()); 1400 int new_len = old_len + delta_len; 1401 int min_len = (delta_len > 0) ? old_len : new_len; 1402 1403 int old_size = operands()->length(); 1404 int new_size = old_size + delta_size; 1405 int min_size = (delta_size > 0) ? old_size : new_size; 1406 1407 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1408 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); 1409 1410 // Set index in the resized array for existing elements only 1411 for (int idx = 0; idx < min_len; idx++) { 1412 int offset = operand_offset_at(idx); // offset in original array 1413 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array 1414 } 1415 // Copy the bootstrap specifiers only 1416 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), 1417 new_ops->adr_at(2*new_len), 1418 (min_size - 2*min_len) * sizeof(u2)); 1419 // Explicitly deallocate old operands array. 1420 // Note, it is not needed for 7u backport. 1421 if ( operands() != NULL) { // the safety check 1422 MetadataFactory::free_array<u2>(loader_data, operands()); 1423 } 1424 set_operands(new_ops); 1425 } // end resize_operands() 1426 1427 1428 // Extend the operands array with the length and size of the ext_cp operands. 1429 // Used in RedefineClasses for CP merge. 1430 void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) { 1431 int delta_len = operand_array_length(ext_cp->operands()); 1432 if (delta_len == 0) { 1433 return; // nothing to do 1434 } 1435 int delta_size = ext_cp->operands()->length(); 1436 1437 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); 1438 1439 if (operand_array_length(operands()) == 0) { 1440 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); 1441 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); 1442 // The first element index defines the offset of second part 1443 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array 1444 set_operands(new_ops); 1445 } else { 1446 resize_operands(delta_len, delta_size, CHECK); 1447 } 1448 1449 } // end extend_operands() 1450 1451 1452 // Shrink the operands array to a smaller array with new_len length. 1453 // Used in RedefineClasses for CP merge. 1454 void ConstantPool::shrink_operands(int new_len, TRAPS) { 1455 int old_len = operand_array_length(operands()); 1456 if (new_len == old_len) { 1457 return; // nothing to do 1458 } 1459 assert(new_len < old_len, "shrunken operands array must be smaller"); 1460 1461 int free_base = operand_next_offset_at(new_len - 1); 1462 int delta_len = new_len - old_len; 1463 int delta_size = 2*delta_len + free_base - operands()->length(); 1464 1465 resize_operands(delta_len, delta_size, CHECK); 1466 1467 } // end shrink_operands() 1468 1469 1470 void ConstantPool::copy_operands(const constantPoolHandle& from_cp, 1471 const constantPoolHandle& to_cp, 1472 TRAPS) { 1473 1474 int from_oplen = operand_array_length(from_cp->operands()); 1475 int old_oplen = operand_array_length(to_cp->operands()); 1476 if (from_oplen != 0) { 1477 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); 1478 // append my operands to the target's operands array 1479 if (old_oplen == 0) { 1480 // Can't just reuse from_cp's operand list because of deallocation issues 1481 int len = from_cp->operands()->length(); 1482 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); 1483 Copy::conjoint_memory_atomic( 1484 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); 1485 to_cp->set_operands(new_ops); 1486 } else { 1487 int old_len = to_cp->operands()->length(); 1488 int from_len = from_cp->operands()->length(); 1489 int old_off = old_oplen * sizeof(u2); 1490 int from_off = from_oplen * sizeof(u2); 1491 // Use the metaspace for the destination constant pool 1492 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); 1493 int fillp = 0, len = 0; 1494 // first part of dest 1495 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), 1496 new_operands->adr_at(fillp), 1497 (len = old_off) * sizeof(u2)); 1498 fillp += len; 1499 // first part of src 1500 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), 1501 new_operands->adr_at(fillp), 1502 (len = from_off) * sizeof(u2)); 1503 fillp += len; 1504 // second part of dest 1505 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), 1506 new_operands->adr_at(fillp), 1507 (len = old_len - old_off) * sizeof(u2)); 1508 fillp += len; 1509 // second part of src 1510 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), 1511 new_operands->adr_at(fillp), 1512 (len = from_len - from_off) * sizeof(u2)); 1513 fillp += len; 1514 assert(fillp == new_operands->length(), ""); 1515 1516 // Adjust indexes in the first part of the copied operands array. 1517 for (int j = 0; j < from_oplen; j++) { 1518 int offset = operand_offset_at(new_operands, old_oplen + j); 1519 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); 1520 offset += old_len; // every new tuple is preceded by old_len extra u2's 1521 operand_offset_at_put(new_operands, old_oplen + j, offset); 1522 } 1523 1524 // replace target operands array with combined array 1525 to_cp->set_operands(new_operands); 1526 } 1527 } 1528 } // end copy_operands() 1529 1530 1531 // Copy this constant pool's entries at start_i to end_i (inclusive) 1532 // to the constant pool to_cp's entries starting at to_i. A total of 1533 // (end_i - start_i) + 1 entries are copied. 1534 void ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i, 1535 const constantPoolHandle& to_cp, int to_i, TRAPS) { 1536 1537 1538 int dest_i = to_i; // leave original alone for debug purposes 1539 1540 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { 1541 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); 1542 1543 switch (from_cp->tag_at(src_i).value()) { 1544 case JVM_CONSTANT_Double: 1545 case JVM_CONSTANT_Long: 1546 // double and long take two constant pool entries 1547 src_i += 2; 1548 dest_i += 2; 1549 break; 1550 1551 default: 1552 // all others take one constant pool entry 1553 src_i++; 1554 dest_i++; 1555 break; 1556 } 1557 } 1558 copy_operands(from_cp, to_cp, CHECK); 1559 1560 } // end copy_cp_to_impl() 1561 1562 1563 // Copy this constant pool's entry at from_i to the constant pool 1564 // to_cp's entry at to_i. 1565 void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i, 1566 const constantPoolHandle& to_cp, int to_i, 1567 TRAPS) { 1568 1569 int tag = from_cp->tag_at(from_i).value(); 1570 switch (tag) { 1571 case JVM_CONSTANT_ClassIndex: 1572 { 1573 jint ki = from_cp->klass_index_at(from_i); 1574 to_cp->klass_index_at_put(to_i, ki); 1575 } break; 1576 1577 case JVM_CONSTANT_Double: 1578 { 1579 jdouble d = from_cp->double_at(from_i); 1580 to_cp->double_at_put(to_i, d); 1581 // double takes two constant pool entries so init second entry's tag 1582 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1583 } break; 1584 1585 case JVM_CONSTANT_Fieldref: 1586 { 1587 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1588 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1589 to_cp->field_at_put(to_i, class_index, name_and_type_index); 1590 } break; 1591 1592 case JVM_CONSTANT_Float: 1593 { 1594 jfloat f = from_cp->float_at(from_i); 1595 to_cp->float_at_put(to_i, f); 1596 } break; 1597 1598 case JVM_CONSTANT_Integer: 1599 { 1600 jint i = from_cp->int_at(from_i); 1601 to_cp->int_at_put(to_i, i); 1602 } break; 1603 1604 case JVM_CONSTANT_InterfaceMethodref: 1605 { 1606 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1607 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1608 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); 1609 } break; 1610 1611 case JVM_CONSTANT_Long: 1612 { 1613 jlong l = from_cp->long_at(from_i); 1614 to_cp->long_at_put(to_i, l); 1615 // long takes two constant pool entries so init second entry's tag 1616 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); 1617 } break; 1618 1619 case JVM_CONSTANT_Methodref: 1620 { 1621 int class_index = from_cp->uncached_klass_ref_index_at(from_i); 1622 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); 1623 to_cp->method_at_put(to_i, class_index, name_and_type_index); 1624 } break; 1625 1626 case JVM_CONSTANT_NameAndType: 1627 { 1628 int name_ref_index = from_cp->name_ref_index_at(from_i); 1629 int signature_ref_index = from_cp->signature_ref_index_at(from_i); 1630 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); 1631 } break; 1632 1633 case JVM_CONSTANT_StringIndex: 1634 { 1635 jint si = from_cp->string_index_at(from_i); 1636 to_cp->string_index_at_put(to_i, si); 1637 } break; 1638 1639 case JVM_CONSTANT_Class: 1640 case JVM_CONSTANT_UnresolvedClass: 1641 case JVM_CONSTANT_UnresolvedClassInError: 1642 { 1643 // Revert to JVM_CONSTANT_ClassIndex 1644 int name_index = from_cp->klass_slot_at(from_i).name_index(); 1645 assert(from_cp->tag_at(name_index).is_symbol(), "sanity"); 1646 to_cp->klass_index_at_put(to_i, name_index); 1647 } break; 1648 1649 case JVM_CONSTANT_String: 1650 { 1651 Symbol* s = from_cp->unresolved_string_at(from_i); 1652 to_cp->unresolved_string_at_put(to_i, s); 1653 } break; 1654 1655 case JVM_CONSTANT_Utf8: 1656 { 1657 Symbol* s = from_cp->symbol_at(from_i); 1658 // Need to increase refcount, the old one will be thrown away and deferenced 1659 s->increment_refcount(); 1660 to_cp->symbol_at_put(to_i, s); 1661 } break; 1662 1663 case JVM_CONSTANT_MethodType: 1664 case JVM_CONSTANT_MethodTypeInError: 1665 { 1666 jint k = from_cp->method_type_index_at(from_i); 1667 to_cp->method_type_index_at_put(to_i, k); 1668 } break; 1669 1670 case JVM_CONSTANT_MethodHandle: 1671 case JVM_CONSTANT_MethodHandleInError: 1672 { 1673 int k1 = from_cp->method_handle_ref_kind_at(from_i); 1674 int k2 = from_cp->method_handle_index_at(from_i); 1675 to_cp->method_handle_index_at_put(to_i, k1, k2); 1676 } break; 1677 1678 case JVM_CONSTANT_Dynamic: 1679 case JVM_CONSTANT_DynamicInError: 1680 { 1681 int k1 = from_cp->bootstrap_methods_attribute_index(from_i); 1682 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i); 1683 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1684 to_cp->dynamic_constant_at_put(to_i, k1, k2); 1685 } break; 1686 1687 case JVM_CONSTANT_InvokeDynamic: 1688 { 1689 int k1 = from_cp->bootstrap_methods_attribute_index(from_i); 1690 int k2 = from_cp->bootstrap_name_and_type_ref_index_at(from_i); 1691 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands 1692 to_cp->invoke_dynamic_at_put(to_i, k1, k2); 1693 } break; 1694 1695 // Invalid is used as the tag for the second constant pool entry 1696 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should 1697 // not be seen by itself. 1698 case JVM_CONSTANT_Invalid: // fall through 1699 1700 default: 1701 { 1702 ShouldNotReachHere(); 1703 } break; 1704 } 1705 } // end copy_entry_to() 1706 1707 // Search constant pool search_cp for an entry that matches this 1708 // constant pool's entry at pattern_i. Returns the index of a 1709 // matching entry or zero (0) if there is no matching entry. 1710 int ConstantPool::find_matching_entry(int pattern_i, 1711 const constantPoolHandle& search_cp, TRAPS) { 1712 1713 // index zero (0) is not used 1714 for (int i = 1; i < search_cp->length(); i++) { 1715 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); 1716 if (found) { 1717 return i; 1718 } 1719 } 1720 1721 return 0; // entry not found; return unused index zero (0) 1722 } // end find_matching_entry() 1723 1724 1725 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool 1726 // cp2's bootstrap specifier at idx2. 1727 bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) { 1728 int k1 = operand_bootstrap_method_ref_index_at(idx1); 1729 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); 1730 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); 1731 1732 if (!match) { 1733 return false; 1734 } 1735 int argc = operand_argument_count_at(idx1); 1736 if (argc == cp2->operand_argument_count_at(idx2)) { 1737 for (int j = 0; j < argc; j++) { 1738 k1 = operand_argument_index_at(idx1, j); 1739 k2 = cp2->operand_argument_index_at(idx2, j); 1740 match = compare_entry_to(k1, cp2, k2, CHECK_false); 1741 if (!match) { 1742 return false; 1743 } 1744 } 1745 return true; // got through loop; all elements equal 1746 } 1747 return false; 1748 } // end compare_operand_to() 1749 1750 // Search constant pool search_cp for a bootstrap specifier that matches 1751 // this constant pool's bootstrap specifier data at pattern_i index. 1752 // Return the index of a matching bootstrap attribute record or (-1) if there is no match. 1753 int ConstantPool::find_matching_operand(int pattern_i, 1754 const constantPoolHandle& search_cp, int search_len, TRAPS) { 1755 for (int i = 0; i < search_len; i++) { 1756 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); 1757 if (found) { 1758 return i; 1759 } 1760 } 1761 return -1; // bootstrap specifier data not found; return unused index (-1) 1762 } // end find_matching_operand() 1763 1764 1765 #ifndef PRODUCT 1766 1767 const char* ConstantPool::printable_name_at(int which) { 1768 1769 constantTag tag = tag_at(which); 1770 1771 if (tag.is_string()) { 1772 return string_at_noresolve(which); 1773 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 1774 return klass_name_at(which)->as_C_string(); 1775 } else if (tag.is_symbol()) { 1776 return symbol_at(which)->as_C_string(); 1777 } 1778 return ""; 1779 } 1780 1781 #endif // PRODUCT 1782 1783 1784 // JVMTI GetConstantPool support 1785 1786 // For debugging of constant pool 1787 const bool debug_cpool = false; 1788 1789 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) 1790 1791 static void print_cpool_bytes(jint cnt, u1 *bytes) { 1792 const char* WARN_MSG = "Must not be such entry!"; 1793 jint size = 0; 1794 u2 idx1, idx2; 1795 1796 for (jint idx = 1; idx < cnt; idx++) { 1797 jint ent_size = 0; 1798 u1 tag = *bytes++; 1799 size++; // count tag 1800 1801 printf("const #%03d, tag: %02d ", idx, tag); 1802 switch(tag) { 1803 case JVM_CONSTANT_Invalid: { 1804 printf("Invalid"); 1805 break; 1806 } 1807 case JVM_CONSTANT_Unicode: { 1808 printf("Unicode %s", WARN_MSG); 1809 break; 1810 } 1811 case JVM_CONSTANT_Utf8: { 1812 u2 len = Bytes::get_Java_u2(bytes); 1813 char str[128]; 1814 if (len > 127) { 1815 len = 127; 1816 } 1817 strncpy(str, (char *) (bytes+2), len); 1818 str[len] = '\0'; 1819 printf("Utf8 \"%s\"", str); 1820 ent_size = 2 + len; 1821 break; 1822 } 1823 case JVM_CONSTANT_Integer: { 1824 u4 val = Bytes::get_Java_u4(bytes); 1825 printf("int %d", *(int *) &val); 1826 ent_size = 4; 1827 break; 1828 } 1829 case JVM_CONSTANT_Float: { 1830 u4 val = Bytes::get_Java_u4(bytes); 1831 printf("float %5.3ff", *(float *) &val); 1832 ent_size = 4; 1833 break; 1834 } 1835 case JVM_CONSTANT_Long: { 1836 u8 val = Bytes::get_Java_u8(bytes); 1837 printf("long " INT64_FORMAT, (int64_t) *(jlong *) &val); 1838 ent_size = 8; 1839 idx++; // Long takes two cpool slots 1840 break; 1841 } 1842 case JVM_CONSTANT_Double: { 1843 u8 val = Bytes::get_Java_u8(bytes); 1844 printf("double %5.3fd", *(jdouble *)&val); 1845 ent_size = 8; 1846 idx++; // Double takes two cpool slots 1847 break; 1848 } 1849 case JVM_CONSTANT_Class: { 1850 idx1 = Bytes::get_Java_u2(bytes); 1851 printf("class #%03d", idx1); 1852 ent_size = 2; 1853 break; 1854 } 1855 case JVM_CONSTANT_String: { 1856 idx1 = Bytes::get_Java_u2(bytes); 1857 printf("String #%03d", idx1); 1858 ent_size = 2; 1859 break; 1860 } 1861 case JVM_CONSTANT_Fieldref: { 1862 idx1 = Bytes::get_Java_u2(bytes); 1863 idx2 = Bytes::get_Java_u2(bytes+2); 1864 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); 1865 ent_size = 4; 1866 break; 1867 } 1868 case JVM_CONSTANT_Methodref: { 1869 idx1 = Bytes::get_Java_u2(bytes); 1870 idx2 = Bytes::get_Java_u2(bytes+2); 1871 printf("Method #%03d, #%03d", idx1, idx2); 1872 ent_size = 4; 1873 break; 1874 } 1875 case JVM_CONSTANT_InterfaceMethodref: { 1876 idx1 = Bytes::get_Java_u2(bytes); 1877 idx2 = Bytes::get_Java_u2(bytes+2); 1878 printf("InterfMethod #%03d, #%03d", idx1, idx2); 1879 ent_size = 4; 1880 break; 1881 } 1882 case JVM_CONSTANT_NameAndType: { 1883 idx1 = Bytes::get_Java_u2(bytes); 1884 idx2 = Bytes::get_Java_u2(bytes+2); 1885 printf("NameAndType #%03d, #%03d", idx1, idx2); 1886 ent_size = 4; 1887 break; 1888 } 1889 case JVM_CONSTANT_ClassIndex: { 1890 printf("ClassIndex %s", WARN_MSG); 1891 break; 1892 } 1893 case JVM_CONSTANT_UnresolvedClass: { 1894 printf("UnresolvedClass: %s", WARN_MSG); 1895 break; 1896 } 1897 case JVM_CONSTANT_UnresolvedClassInError: { 1898 printf("UnresolvedClassInErr: %s", WARN_MSG); 1899 break; 1900 } 1901 case JVM_CONSTANT_StringIndex: { 1902 printf("StringIndex: %s", WARN_MSG); 1903 break; 1904 } 1905 } 1906 printf(";\n"); 1907 bytes += ent_size; 1908 size += ent_size; 1909 } 1910 printf("Cpool size: %d\n", size); 1911 fflush(0); 1912 return; 1913 } /* end print_cpool_bytes */ 1914 1915 1916 // Returns size of constant pool entry. 1917 jint ConstantPool::cpool_entry_size(jint idx) { 1918 switch(tag_at(idx).value()) { 1919 case JVM_CONSTANT_Invalid: 1920 case JVM_CONSTANT_Unicode: 1921 return 1; 1922 1923 case JVM_CONSTANT_Utf8: 1924 return 3 + symbol_at(idx)->utf8_length(); 1925 1926 case JVM_CONSTANT_Class: 1927 case JVM_CONSTANT_String: 1928 case JVM_CONSTANT_ClassIndex: 1929 case JVM_CONSTANT_UnresolvedClass: 1930 case JVM_CONSTANT_UnresolvedClassInError: 1931 case JVM_CONSTANT_StringIndex: 1932 case JVM_CONSTANT_MethodType: 1933 case JVM_CONSTANT_MethodTypeInError: 1934 return 3; 1935 1936 case JVM_CONSTANT_MethodHandle: 1937 case JVM_CONSTANT_MethodHandleInError: 1938 return 4; //tag, ref_kind, ref_index 1939 1940 case JVM_CONSTANT_Integer: 1941 case JVM_CONSTANT_Float: 1942 case JVM_CONSTANT_Fieldref: 1943 case JVM_CONSTANT_Methodref: 1944 case JVM_CONSTANT_InterfaceMethodref: 1945 case JVM_CONSTANT_NameAndType: 1946 return 5; 1947 1948 case JVM_CONSTANT_Dynamic: 1949 case JVM_CONSTANT_DynamicInError: 1950 case JVM_CONSTANT_InvokeDynamic: 1951 // u1 tag, u2 bsm, u2 nt 1952 return 5; 1953 1954 case JVM_CONSTANT_Long: 1955 case JVM_CONSTANT_Double: 1956 return 9; 1957 } 1958 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); 1959 return 1; 1960 } /* end cpool_entry_size */ 1961 1962 1963 // SymbolHashMap is used to find a constant pool index from a string. 1964 // This function fills in SymbolHashMaps, one for utf8s and one for 1965 // class names, returns size of the cpool raw bytes. 1966 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, 1967 SymbolHashMap *classmap) { 1968 jint size = 0; 1969 1970 for (u2 idx = 1; idx < length(); idx++) { 1971 u2 tag = tag_at(idx).value(); 1972 size += cpool_entry_size(idx); 1973 1974 switch(tag) { 1975 case JVM_CONSTANT_Utf8: { 1976 Symbol* sym = symbol_at(idx); 1977 symmap->add_entry(sym, idx); 1978 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); 1979 break; 1980 } 1981 case JVM_CONSTANT_Class: 1982 case JVM_CONSTANT_UnresolvedClass: 1983 case JVM_CONSTANT_UnresolvedClassInError: { 1984 Symbol* sym = klass_name_at(idx); 1985 classmap->add_entry(sym, idx); 1986 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); 1987 break; 1988 } 1989 case JVM_CONSTANT_Long: 1990 case JVM_CONSTANT_Double: { 1991 idx++; // Both Long and Double take two cpool slots 1992 break; 1993 } 1994 } 1995 } 1996 return size; 1997 } /* end hash_utf8_entries_to */ 1998 1999 2000 // Copy cpool bytes. 2001 // Returns: 2002 // 0, in case of OutOfMemoryError 2003 // -1, in case of internal error 2004 // > 0, count of the raw cpool bytes that have been copied 2005 int ConstantPool::copy_cpool_bytes(int cpool_size, 2006 SymbolHashMap* tbl, 2007 unsigned char *bytes) { 2008 u2 idx1, idx2; 2009 jint size = 0; 2010 jint cnt = length(); 2011 unsigned char *start_bytes = bytes; 2012 2013 for (jint idx = 1; idx < cnt; idx++) { 2014 u1 tag = tag_at(idx).value(); 2015 jint ent_size = cpool_entry_size(idx); 2016 2017 assert(size + ent_size <= cpool_size, "Size mismatch"); 2018 2019 *bytes = tag; 2020 DBG(printf("#%03hd tag=%03hd, ", (short)idx, (short)tag)); 2021 switch(tag) { 2022 case JVM_CONSTANT_Invalid: { 2023 DBG(printf("JVM_CONSTANT_Invalid")); 2024 break; 2025 } 2026 case JVM_CONSTANT_Unicode: { 2027 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); 2028 DBG(printf("JVM_CONSTANT_Unicode")); 2029 break; 2030 } 2031 case JVM_CONSTANT_Utf8: { 2032 Symbol* sym = symbol_at(idx); 2033 char* str = sym->as_utf8(); 2034 // Warning! It's crashing on x86 with len = sym->utf8_length() 2035 int len = (int) strlen(str); 2036 Bytes::put_Java_u2((address) (bytes+1), (u2) len); 2037 for (int i = 0; i < len; i++) { 2038 bytes[3+i] = (u1) str[i]; 2039 } 2040 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); 2041 break; 2042 } 2043 case JVM_CONSTANT_Integer: { 2044 jint val = int_at(idx); 2045 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 2046 break; 2047 } 2048 case JVM_CONSTANT_Float: { 2049 jfloat val = float_at(idx); 2050 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); 2051 break; 2052 } 2053 case JVM_CONSTANT_Long: { 2054 jlong val = long_at(idx); 2055 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 2056 idx++; // Long takes two cpool slots 2057 break; 2058 } 2059 case JVM_CONSTANT_Double: { 2060 jdouble val = double_at(idx); 2061 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); 2062 idx++; // Double takes two cpool slots 2063 break; 2064 } 2065 case JVM_CONSTANT_Class: 2066 case JVM_CONSTANT_UnresolvedClass: 2067 case JVM_CONSTANT_UnresolvedClassInError: { 2068 *bytes = JVM_CONSTANT_Class; 2069 Symbol* sym = klass_name_at(idx); 2070 idx1 = tbl->symbol_to_value(sym); 2071 assert(idx1 != 0, "Have not found a hashtable entry"); 2072 Bytes::put_Java_u2((address) (bytes+1), idx1); 2073 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); 2074 break; 2075 } 2076 case JVM_CONSTANT_String: { 2077 *bytes = JVM_CONSTANT_String; 2078 Symbol* sym = unresolved_string_at(idx); 2079 idx1 = tbl->symbol_to_value(sym); 2080 assert(idx1 != 0, "Have not found a hashtable entry"); 2081 Bytes::put_Java_u2((address) (bytes+1), idx1); 2082 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); 2083 break; 2084 } 2085 case JVM_CONSTANT_Fieldref: 2086 case JVM_CONSTANT_Methodref: 2087 case JVM_CONSTANT_InterfaceMethodref: { 2088 idx1 = uncached_klass_ref_index_at(idx); 2089 idx2 = uncached_name_and_type_ref_index_at(idx); 2090 Bytes::put_Java_u2((address) (bytes+1), idx1); 2091 Bytes::put_Java_u2((address) (bytes+3), idx2); 2092 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); 2093 break; 2094 } 2095 case JVM_CONSTANT_NameAndType: { 2096 idx1 = name_ref_index_at(idx); 2097 idx2 = signature_ref_index_at(idx); 2098 Bytes::put_Java_u2((address) (bytes+1), idx1); 2099 Bytes::put_Java_u2((address) (bytes+3), idx2); 2100 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); 2101 break; 2102 } 2103 case JVM_CONSTANT_ClassIndex: { 2104 *bytes = JVM_CONSTANT_Class; 2105 idx1 = klass_index_at(idx); 2106 Bytes::put_Java_u2((address) (bytes+1), idx1); 2107 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); 2108 break; 2109 } 2110 case JVM_CONSTANT_StringIndex: { 2111 *bytes = JVM_CONSTANT_String; 2112 idx1 = string_index_at(idx); 2113 Bytes::put_Java_u2((address) (bytes+1), idx1); 2114 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); 2115 break; 2116 } 2117 case JVM_CONSTANT_MethodHandle: 2118 case JVM_CONSTANT_MethodHandleInError: { 2119 *bytes = JVM_CONSTANT_MethodHandle; 2120 int kind = method_handle_ref_kind_at(idx); 2121 idx1 = method_handle_index_at(idx); 2122 *(bytes+1) = (unsigned char) kind; 2123 Bytes::put_Java_u2((address) (bytes+2), idx1); 2124 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); 2125 break; 2126 } 2127 case JVM_CONSTANT_MethodType: 2128 case JVM_CONSTANT_MethodTypeInError: { 2129 *bytes = JVM_CONSTANT_MethodType; 2130 idx1 = method_type_index_at(idx); 2131 Bytes::put_Java_u2((address) (bytes+1), idx1); 2132 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); 2133 break; 2134 } 2135 case JVM_CONSTANT_Dynamic: 2136 case JVM_CONSTANT_DynamicInError: { 2137 *bytes = tag; 2138 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 2139 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 2140 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4"); 2141 Bytes::put_Java_u2((address) (bytes+1), idx1); 2142 Bytes::put_Java_u2((address) (bytes+3), idx2); 2143 DBG(printf("JVM_CONSTANT_Dynamic: %hd %hd", idx1, idx2)); 2144 break; 2145 } 2146 case JVM_CONSTANT_InvokeDynamic: { 2147 *bytes = tag; 2148 idx1 = extract_low_short_from_int(*int_at_addr(idx)); 2149 idx2 = extract_high_short_from_int(*int_at_addr(idx)); 2150 assert(idx2 == bootstrap_name_and_type_ref_index_at(idx), "correct half of u4"); 2151 Bytes::put_Java_u2((address) (bytes+1), idx1); 2152 Bytes::put_Java_u2((address) (bytes+3), idx2); 2153 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); 2154 break; 2155 } 2156 } 2157 DBG(printf("\n")); 2158 bytes += ent_size; 2159 size += ent_size; 2160 } 2161 assert(size == cpool_size, "Size mismatch"); 2162 2163 // Keep temorarily for debugging until it's stable. 2164 DBG(print_cpool_bytes(cnt, start_bytes)); 2165 return (int)(bytes - start_bytes); 2166 } /* end copy_cpool_bytes */ 2167 2168 #undef DBG 2169 2170 2171 void ConstantPool::set_on_stack(const bool value) { 2172 if (value) { 2173 // Only record if it's not already set. 2174 if (!on_stack()) { 2175 assert(!is_shared(), "should always be set for shared constant pools"); 2176 _flags |= _on_stack; 2177 MetadataOnStackMark::record(this); 2178 } 2179 } else { 2180 // Clearing is done single-threadedly. 2181 if (!is_shared()) { 2182 _flags &= ~_on_stack; 2183 } 2184 } 2185 } 2186 2187 // JSR 292 support for patching constant pool oops after the class is linked and 2188 // the oop array for resolved references are created. 2189 // We can't do this during classfile parsing, which is how the other indexes are 2190 // patched. The other patches are applied early for some error checking 2191 // so only defer the pseudo_strings. 2192 void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) { 2193 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused 2194 Handle patch = cp_patches->at(index); 2195 if (patch.not_null()) { 2196 assert (tag_at(index).is_string(), "should only be string left"); 2197 // Patching a string means pre-resolving it. 2198 // The spelling in the constant pool is ignored. 2199 // The constant reference may be any object whatever. 2200 // If it is not a real interned string, the constant is referred 2201 // to as a "pseudo-string", and must be presented to the CP 2202 // explicitly, because it may require scavenging. 2203 int obj_index = cp_to_object_index(index); 2204 pseudo_string_at_put(index, obj_index, patch()); 2205 DEBUG_ONLY(cp_patches->at_put(index, Handle());) 2206 } 2207 } 2208 #ifdef ASSERT 2209 // Ensure that all the patches have been used. 2210 for (int index = 0; index < cp_patches->length(); index++) { 2211 assert(cp_patches->at(index).is_null(), 2212 "Unused constant pool patch at %d in class file %s", 2213 index, 2214 pool_holder()->external_name()); 2215 } 2216 #endif // ASSERT 2217 } 2218 2219 // Printing 2220 2221 void ConstantPool::print_on(outputStream* st) const { 2222 assert(is_constantPool(), "must be constantPool"); 2223 st->print_cr("%s", internal_name()); 2224 if (flags() != 0) { 2225 st->print(" - flags: 0x%x", flags()); 2226 if (has_preresolution()) st->print(" has_preresolution"); 2227 if (on_stack()) st->print(" on_stack"); 2228 st->cr(); 2229 } 2230 if (pool_holder() != NULL) { 2231 st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder())); 2232 } 2233 st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache())); 2234 st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references())); 2235 st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map())); 2236 st->print_cr(" - resolved_klasses: " INTPTR_FORMAT, p2i(resolved_klasses())); 2237 2238 for (int index = 1; index < length(); index++) { // Index 0 is unused 2239 ((ConstantPool*)this)->print_entry_on(index, st); 2240 switch (tag_at(index).value()) { 2241 case JVM_CONSTANT_Long : 2242 case JVM_CONSTANT_Double : 2243 index++; // Skip entry following eigth-byte constant 2244 } 2245 2246 } 2247 st->cr(); 2248 } 2249 2250 // Print one constant pool entry 2251 void ConstantPool::print_entry_on(const int index, outputStream* st) { 2252 EXCEPTION_MARK; 2253 st->print(" - %3d : ", index); 2254 tag_at(index).print_on(st); 2255 st->print(" : "); 2256 switch (tag_at(index).value()) { 2257 case JVM_CONSTANT_Class : 2258 { Klass* k = klass_at(index, CATCH); 2259 guarantee(k != NULL, "need klass"); 2260 k->print_value_on(st); 2261 st->print(" {" PTR_FORMAT "}", p2i(k)); 2262 } 2263 break; 2264 case JVM_CONSTANT_Fieldref : 2265 case JVM_CONSTANT_Methodref : 2266 case JVM_CONSTANT_InterfaceMethodref : 2267 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); 2268 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); 2269 break; 2270 case JVM_CONSTANT_String : 2271 if (is_pseudo_string_at(index)) { 2272 oop anObj = pseudo_string_at(index); 2273 anObj->print_value_on(st); 2274 st->print(" {" PTR_FORMAT "}", p2i(anObj)); 2275 } else { 2276 unresolved_string_at(index)->print_value_on(st); 2277 } 2278 break; 2279 case JVM_CONSTANT_Integer : 2280 st->print("%d", int_at(index)); 2281 break; 2282 case JVM_CONSTANT_Float : 2283 st->print("%f", float_at(index)); 2284 break; 2285 case JVM_CONSTANT_Long : 2286 st->print_jlong(long_at(index)); 2287 break; 2288 case JVM_CONSTANT_Double : 2289 st->print("%lf", double_at(index)); 2290 break; 2291 case JVM_CONSTANT_NameAndType : 2292 st->print("name_index=%d", name_ref_index_at(index)); 2293 st->print(" signature_index=%d", signature_ref_index_at(index)); 2294 break; 2295 case JVM_CONSTANT_Utf8 : 2296 symbol_at(index)->print_value_on(st); 2297 break; 2298 case JVM_CONSTANT_ClassIndex: { 2299 int name_index = *int_at_addr(index); 2300 st->print("klass_index=%d ", name_index); 2301 symbol_at(name_index)->print_value_on(st); 2302 } 2303 break; 2304 case JVM_CONSTANT_UnresolvedClass : // fall-through 2305 case JVM_CONSTANT_UnresolvedClassInError: { 2306 CPKlassSlot kslot = klass_slot_at(index); 2307 int resolved_klass_index = kslot.resolved_klass_index(); 2308 int name_index = kslot.name_index(); 2309 assert(tag_at(name_index).is_symbol(), "sanity"); 2310 2311 Klass* klass = resolved_klasses()->at(resolved_klass_index); 2312 if (klass != NULL) { 2313 klass->print_value_on(st); 2314 } else { 2315 symbol_at(name_index)->print_value_on(st); 2316 } 2317 } 2318 break; 2319 case JVM_CONSTANT_MethodHandle : 2320 case JVM_CONSTANT_MethodHandleInError : 2321 st->print("ref_kind=%d", method_handle_ref_kind_at(index)); 2322 st->print(" ref_index=%d", method_handle_index_at(index)); 2323 break; 2324 case JVM_CONSTANT_MethodType : 2325 case JVM_CONSTANT_MethodTypeInError : 2326 st->print("signature_index=%d", method_type_index_at(index)); 2327 break; 2328 case JVM_CONSTANT_Dynamic : 2329 case JVM_CONSTANT_DynamicInError : 2330 { 2331 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index)); 2332 st->print(" type_index=%d", bootstrap_name_and_type_ref_index_at(index)); 2333 int argc = bootstrap_argument_count_at(index); 2334 if (argc > 0) { 2335 for (int arg_i = 0; arg_i < argc; arg_i++) { 2336 int arg = bootstrap_argument_index_at(index, arg_i); 2337 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 2338 } 2339 st->print("}"); 2340 } 2341 } 2342 break; 2343 case JVM_CONSTANT_InvokeDynamic : 2344 { 2345 st->print("bootstrap_method_index=%d", bootstrap_method_ref_index_at(index)); 2346 st->print(" name_and_type_index=%d", bootstrap_name_and_type_ref_index_at(index)); 2347 int argc = bootstrap_argument_count_at(index); 2348 if (argc > 0) { 2349 for (int arg_i = 0; arg_i < argc; arg_i++) { 2350 int arg = bootstrap_argument_index_at(index, arg_i); 2351 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); 2352 } 2353 st->print("}"); 2354 } 2355 } 2356 break; 2357 default: 2358 ShouldNotReachHere(); 2359 break; 2360 } 2361 st->cr(); 2362 } 2363 2364 void ConstantPool::print_value_on(outputStream* st) const { 2365 assert(is_constantPool(), "must be constantPool"); 2366 st->print("constant pool [%d]", length()); 2367 if (has_preresolution()) st->print("/preresolution"); 2368 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); 2369 print_address_on(st); 2370 if (pool_holder() != NULL) { 2371 st->print(" for "); 2372 pool_holder()->print_value_on(st); 2373 bool extra = (pool_holder()->constants() != this); 2374 if (extra) st->print(" (extra)"); 2375 } 2376 if (cache() != NULL) { 2377 st->print(" cache=" PTR_FORMAT, p2i(cache())); 2378 } 2379 } 2380 2381 // Verification 2382 2383 void ConstantPool::verify_on(outputStream* st) { 2384 guarantee(is_constantPool(), "object must be constant pool"); 2385 for (int i = 0; i< length(); i++) { 2386 constantTag tag = tag_at(i); 2387 if (tag.is_klass() || tag.is_unresolved_klass()) { 2388 guarantee(klass_name_at(i)->refcount() != 0, "should have nonzero reference count"); 2389 } else if (tag.is_symbol()) { 2390 CPSlot entry = slot_at(i); 2391 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2392 } else if (tag.is_string()) { 2393 CPSlot entry = slot_at(i); 2394 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); 2395 } 2396 } 2397 if (pool_holder() != NULL) { 2398 // Note: pool_holder() can be NULL in temporary constant pools 2399 // used during constant pool merging 2400 guarantee(pool_holder()->is_klass(), "should be klass"); 2401 } 2402 } 2403 2404 2405 SymbolHashMap::~SymbolHashMap() { 2406 SymbolHashMapEntry* next; 2407 for (int i = 0; i < _table_size; i++) { 2408 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) { 2409 next = cur->next(); 2410 delete(cur); 2411 } 2412 } 2413 FREE_C_HEAP_ARRAY(SymbolHashMapBucket, _buckets); 2414 } 2415 2416 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { 2417 char *str = sym->as_utf8(); 2418 unsigned int hash = compute_hash(str, sym->utf8_length()); 2419 unsigned int index = hash % table_size(); 2420 2421 // check if already in map 2422 // we prefer the first entry since it is more likely to be what was used in 2423 // the class file 2424 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2425 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2426 if (en->hash() == hash && en->symbol() == sym) { 2427 return; // already there 2428 } 2429 } 2430 2431 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); 2432 entry->set_next(bucket(index)); 2433 _buckets[index].set_entry(entry); 2434 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2435 } 2436 2437 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { 2438 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); 2439 char *str = sym->as_utf8(); 2440 int len = sym->utf8_length(); 2441 unsigned int hash = SymbolHashMap::compute_hash(str, len); 2442 unsigned int index = hash % table_size(); 2443 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { 2444 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); 2445 if (en->hash() == hash && en->symbol() == sym) { 2446 return en; 2447 } 2448 } 2449 return NULL; 2450 } 2451 2452 void SymbolHashMap::initialize_table(int table_size) { 2453 _table_size = table_size; 2454 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol); 2455 for (int index = 0; index < table_size; index++) { 2456 _buckets[index].clear(); 2457 } 2458 }