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