1 /* 2 * Copyright (c) 1999, 2022, 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 "ci/ciField.hpp" 27 #include "ci/ciInlineKlass.hpp" 28 #include "ci/ciInstance.hpp" 29 #include "ci/ciInstanceKlass.hpp" 30 #include "ci/ciUtilities.inline.hpp" 31 #include "classfile/javaClasses.hpp" 32 #include "classfile/systemDictionary.hpp" 33 #include "classfile/vmClasses.hpp" 34 #include "memory/allocation.hpp" 35 #include "memory/allocation.inline.hpp" 36 #include "memory/resourceArea.hpp" 37 #include "oops/instanceKlass.inline.hpp" 38 #include "oops/klass.inline.hpp" 39 #include "oops/oop.inline.hpp" 40 #include "oops/fieldStreams.inline.hpp" 41 #include "oops/inlineKlass.inline.hpp" 42 #include "runtime/fieldDescriptor.inline.hpp" 43 #include "runtime/handles.inline.hpp" 44 #include "runtime/jniHandles.inline.hpp" 45 46 // ciInstanceKlass 47 // 48 // This class represents a Klass* in the HotSpot virtual machine 49 // whose Klass part in an InstanceKlass. 50 51 52 // ------------------------------------------------------------------ 53 // ciInstanceKlass::ciInstanceKlass 54 // 55 // Loaded instance klass. 56 ciInstanceKlass::ciInstanceKlass(Klass* k) : 57 ciKlass(k) 58 { 59 assert(get_Klass()->is_instance_klass(), "wrong type"); 60 assert(get_instanceKlass()->is_loaded(), "must be at least loaded"); 61 InstanceKlass* ik = get_instanceKlass(); 62 63 AccessFlags access_flags = ik->access_flags(); 64 _flags = ciFlags(access_flags); 65 _has_finalizer = access_flags.has_finalizer(); 66 _has_subklass = flags().is_final() ? subklass_false : subklass_unknown; 67 _init_state = ik->init_state(); 68 _has_nonstatic_fields = ik->has_nonstatic_fields(); 69 _has_nonstatic_concrete_methods = ik->has_nonstatic_concrete_methods(); 70 _is_hidden = ik->is_hidden(); 71 _is_record = ik->is_record(); 72 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields: 73 _has_injected_fields = -1; 74 _implementor = NULL; // we will fill these lazily 75 _transitive_interfaces = NULL; 76 77 // Ensure that the metadata wrapped by the ciMetadata is kept alive by GC. 78 // This is primarily useful for metadata which is considered as weak roots 79 // by the GC but need to be strong roots if reachable from a current compilation. 80 // InstanceKlass are created for both weak and strong metadata. Ensuring this metadata 81 // alive covers the cases where there are weak roots without performance cost. 82 oop holder = ik->klass_holder(); 83 if (ik->class_loader_data()->has_class_mirror_holder()) { 84 // Though ciInstanceKlass records class loader oop, it's not enough to keep 85 // non-strong hidden classes alive (loader == NULL). Klass holder should 86 // be used instead. It is enough to record a ciObject, since cached elements are never removed 87 // during ciObjectFactory lifetime. ciObjectFactory itself is created for 88 // every compilation and lives for the whole duration of the compilation. 89 assert(holder != NULL, "holder of hidden class is the mirror which is never null"); 90 (void)CURRENT_ENV->get_object(holder); 91 } 92 93 JavaThread *thread = JavaThread::current(); 94 if (ciObjectFactory::is_initialized()) { 95 _loader = JNIHandles::make_local(thread, ik->class_loader()); 96 _protection_domain = JNIHandles::make_local(thread, 97 ik->protection_domain()); 98 _is_shared = false; 99 } else { 100 Handle h_loader(thread, ik->class_loader()); 101 Handle h_protection_domain(thread, ik->protection_domain()); 102 _loader = JNIHandles::make_global(h_loader); 103 _protection_domain = JNIHandles::make_global(h_protection_domain); 104 _is_shared = true; 105 } 106 107 _has_trusted_loader = compute_has_trusted_loader(); 108 109 // Lazy fields get filled in only upon request. 110 _super = NULL; 111 _java_mirror = NULL; 112 113 if (is_shared()) { 114 if (k != vmClasses::Object_klass()) { 115 super(); 116 } 117 //compute_nonstatic_fields(); // done outside of constructor 118 } 119 120 _field_cache = NULL; 121 } 122 123 // Version for unloaded classes: 124 ciInstanceKlass::ciInstanceKlass(ciSymbol* name, 125 jobject loader, jobject protection_domain, 126 BasicType bt) 127 : ciKlass(name, bt) 128 { 129 assert(name->char_at(0) != JVM_SIGNATURE_ARRAY, "not an instance klass"); 130 _init_state = (InstanceKlass::ClassState)0; 131 _has_nonstatic_fields = false; 132 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields 133 _has_injected_fields = -1; 134 _is_hidden = false; 135 _is_record = false; 136 _loader = loader; 137 _protection_domain = protection_domain; 138 _is_shared = false; 139 _super = NULL; 140 _java_mirror = NULL; 141 _field_cache = NULL; 142 _has_trusted_loader = compute_has_trusted_loader(); 143 } 144 145 146 147 // ------------------------------------------------------------------ 148 // ciInstanceKlass::compute_shared_is_initialized 149 void ciInstanceKlass::compute_shared_init_state() { 150 GUARDED_VM_ENTRY( 151 InstanceKlass* ik = get_instanceKlass(); 152 _init_state = ik->init_state(); 153 ) 154 } 155 156 // ------------------------------------------------------------------ 157 // ciInstanceKlass::compute_shared_has_subklass 158 bool ciInstanceKlass::compute_shared_has_subklass() { 159 GUARDED_VM_ENTRY( 160 InstanceKlass* ik = get_instanceKlass(); 161 _has_subklass = ik->subklass() != NULL ? subklass_true : subklass_false; 162 return _has_subklass == subklass_true; 163 ) 164 } 165 166 // ------------------------------------------------------------------ 167 // ciInstanceKlass::loader 168 oop ciInstanceKlass::loader() { 169 ASSERT_IN_VM; 170 return JNIHandles::resolve(_loader); 171 } 172 173 // ------------------------------------------------------------------ 174 // ciInstanceKlass::loader_handle 175 jobject ciInstanceKlass::loader_handle() { 176 return _loader; 177 } 178 179 // ------------------------------------------------------------------ 180 // ciInstanceKlass::protection_domain 181 oop ciInstanceKlass::protection_domain() { 182 ASSERT_IN_VM; 183 return JNIHandles::resolve(_protection_domain); 184 } 185 186 // ------------------------------------------------------------------ 187 // ciInstanceKlass::protection_domain_handle 188 jobject ciInstanceKlass::protection_domain_handle() { 189 return _protection_domain; 190 } 191 192 // ------------------------------------------------------------------ 193 // ciInstanceKlass::field_cache 194 // 195 // Get the field cache associated with this klass. 196 ciConstantPoolCache* ciInstanceKlass::field_cache() { 197 if (is_shared()) { 198 return NULL; 199 } 200 if (_field_cache == NULL) { 201 assert(!is_java_lang_Object(), "Object has no fields"); 202 Arena* arena = CURRENT_ENV->arena(); 203 _field_cache = new (arena) ciConstantPoolCache(arena, 5); 204 } 205 return _field_cache; 206 } 207 208 // ------------------------------------------------------------------ 209 // ciInstanceKlass::get_canonical_holder 210 // 211 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) { 212 #ifdef ASSERT 213 if (!(offset >= 0 && offset < layout_helper_size_in_bytes())) { 214 tty->print("*** get_canonical_holder(%d) on ", offset); 215 this->print(); 216 tty->print_cr(" ***"); 217 }; 218 assert(offset >= 0 && offset < layout_helper_size_in_bytes(), "offset must be tame"); 219 #endif 220 221 if (offset < instanceOopDesc::base_offset_in_bytes()) { 222 // All header offsets belong properly to java/lang/Object. 223 return CURRENT_ENV->Object_klass(); 224 } 225 226 ciInstanceKlass* self = this; 227 assert(self->is_loaded(), "must be loaded to access field info"); 228 ciField* field = self->get_field_by_offset(offset, false); 229 if (field != NULL) { 230 return field->holder(); 231 } else { 232 for (;;) { 233 assert(self->is_loaded(), "must be loaded to have size"); 234 ciInstanceKlass* super = self->super(); 235 if (super == NULL || 236 super->nof_nonstatic_fields() == 0 || 237 super->layout_helper_size_in_bytes() <= offset) { 238 return self; 239 } else { 240 self = super; // return super->get_canonical_holder(offset) 241 } 242 } 243 } 244 } 245 246 // ------------------------------------------------------------------ 247 // ciInstanceKlass::is_java_lang_Object 248 // 249 // Is this klass java.lang.Object? 250 bool ciInstanceKlass::is_java_lang_Object() const { 251 return equals(CURRENT_ENV->Object_klass()); 252 } 253 254 // ------------------------------------------------------------------ 255 // ciInstanceKlass::uses_default_loader 256 bool ciInstanceKlass::uses_default_loader() const { 257 // Note: We do not need to resolve the handle or enter the VM 258 // in order to test null-ness. 259 return _loader == NULL; 260 } 261 262 // ------------------------------------------------------------------ 263 264 /** 265 * Return basic type of boxed value for box klass or T_OBJECT if not. 266 */ 267 BasicType ciInstanceKlass::box_klass_type() const { 268 if (uses_default_loader() && is_loaded()) { 269 return vmClasses::box_klass_type(get_Klass()); 270 } else { 271 return T_OBJECT; 272 } 273 } 274 275 /** 276 * Is this boxing klass? 277 */ 278 bool ciInstanceKlass::is_box_klass() const { 279 return is_java_primitive(box_klass_type()); 280 } 281 282 /** 283 * Is this boxed value offset? 284 */ 285 bool ciInstanceKlass::is_boxed_value_offset(int offset) const { 286 BasicType bt = box_klass_type(); 287 return is_java_primitive(bt) && 288 (offset == java_lang_boxing_object::value_offset(bt)); 289 } 290 291 // ------------------------------------------------------------------ 292 // ciInstanceKlass::is_in_package 293 // 294 // Is this klass in the given package? 295 bool ciInstanceKlass::is_in_package(const char* packagename, int len) { 296 // To avoid class loader mischief, this test always rejects application classes. 297 if (!uses_default_loader()) 298 return false; 299 GUARDED_VM_ENTRY( 300 return is_in_package_impl(packagename, len); 301 ) 302 } 303 304 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) { 305 ASSERT_IN_VM; 306 307 // If packagename contains trailing '/' exclude it from the 308 // prefix-test since we test for it explicitly. 309 if (packagename[len - 1] == '/') 310 len--; 311 312 if (!name()->starts_with(packagename, len)) 313 return false; 314 315 // Test if the class name is something like "java/lang". 316 if ((len + 1) > name()->utf8_length()) 317 return false; 318 319 // Test for trailing '/' 320 if (name()->char_at(len) != '/') 321 return false; 322 323 // Make sure it's not actually in a subpackage: 324 if (name()->index_of_at(len+1, "/", 1) >= 0) 325 return false; 326 327 return true; 328 } 329 330 // ------------------------------------------------------------------ 331 // ciInstanceKlass::print_impl 332 // 333 // Implementation of the print method. 334 void ciInstanceKlass::print_impl(outputStream* st) { 335 ciKlass::print_impl(st); 336 GUARDED_VM_ENTRY(st->print(" loader=" INTPTR_FORMAT, p2i(loader()));) 337 if (is_loaded()) { 338 st->print(" initialized=%s finalized=%s subklass=%s size=%d flags=", 339 bool_to_str(is_initialized()), 340 bool_to_str(has_finalizer()), 341 bool_to_str(has_subklass()), 342 layout_helper()); 343 344 _flags.print_klass_flags(st); 345 346 if (_super) { 347 st->print(" super="); 348 _super->print_name_on(st); 349 } 350 if (_java_mirror) { 351 st->print(" mirror=PRESENT"); 352 } 353 } 354 } 355 356 // ------------------------------------------------------------------ 357 // ciInstanceKlass::super 358 // 359 // Get the superklass of this klass. 360 ciInstanceKlass* ciInstanceKlass::super() { 361 assert(is_loaded(), "must be loaded"); 362 if (_super == NULL && !is_java_lang_Object()) { 363 GUARDED_VM_ENTRY( 364 Klass* super_klass = get_instanceKlass()->super(); 365 _super = CURRENT_ENV->get_instance_klass(super_klass); 366 ) 367 } 368 return _super; 369 } 370 371 // ------------------------------------------------------------------ 372 // ciInstanceKlass::java_mirror 373 // 374 // Get the instance of java.lang.Class corresponding to this klass. 375 // Cache it on this->_java_mirror. 376 ciInstance* ciInstanceKlass::java_mirror() { 377 if (is_shared()) { 378 return ciKlass::java_mirror(); 379 } 380 if (_java_mirror == NULL) { 381 _java_mirror = ciKlass::java_mirror(); 382 } 383 return _java_mirror; 384 } 385 386 // ------------------------------------------------------------------ 387 // ciInstanceKlass::unique_concrete_subklass 388 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() { 389 if (!is_loaded()) return NULL; // No change if class is not loaded 390 if (!is_abstract()) return NULL; // Only applies to abstract classes. 391 if (!has_subklass()) return NULL; // Must have at least one subklass. 392 VM_ENTRY_MARK; 393 InstanceKlass* ik = get_instanceKlass(); 394 Klass* up = ik->up_cast_abstract(); 395 assert(up->is_instance_klass(), "must be InstanceKlass"); 396 if (ik == up) { 397 return NULL; 398 } 399 return CURRENT_THREAD_ENV->get_instance_klass(up); 400 } 401 402 // ------------------------------------------------------------------ 403 // ciInstanceKlass::has_finalizable_subclass 404 bool ciInstanceKlass::has_finalizable_subclass() { 405 if (!is_loaded()) return true; 406 VM_ENTRY_MARK; 407 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL; 408 } 409 410 // ------------------------------------------------------------------ 411 // ciInstanceKlass::contains_field_offset 412 bool ciInstanceKlass::contains_field_offset(int offset) { 413 VM_ENTRY_MARK; 414 return get_instanceKlass()->contains_field_offset(offset); 415 } 416 417 // ------------------------------------------------------------------ 418 // ciInstanceKlass::get_field_by_offset 419 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) { 420 if (!is_static) { 421 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) { 422 ciField* field = _nonstatic_fields->at(i); 423 int field_off = field->offset_in_bytes(); 424 if (field_off == field_offset) 425 return field; 426 if (field_off > field_offset) 427 break; 428 // could do binary search or check bins, but probably not worth it 429 } 430 return NULL; 431 } 432 VM_ENTRY_MARK; 433 InstanceKlass* k = get_instanceKlass(); 434 fieldDescriptor fd; 435 if (!k->find_field_from_offset(field_offset, is_static, &fd)) { 436 return NULL; 437 } 438 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd); 439 return field; 440 } 441 442 ciField* ciInstanceKlass::get_non_flattened_field_by_offset(int field_offset) { 443 if (super() != NULL && super()->has_nonstatic_fields()) { 444 ciField* f = super()->get_non_flattened_field_by_offset(field_offset); 445 if (f != NULL) { 446 return f; 447 } 448 } 449 450 VM_ENTRY_MARK; 451 InstanceKlass* k = get_instanceKlass(); 452 Arena* arena = CURRENT_ENV->arena(); 453 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 454 if (fs.access_flags().is_static()) continue; 455 fieldDescriptor& fd = fs.field_descriptor(); 456 if (fd.offset() == field_offset) { 457 ciField* f = new (arena) ciField(&fd); 458 return f; 459 } 460 } 461 462 return NULL; 463 } 464 465 // ------------------------------------------------------------------ 466 // ciInstanceKlass::get_field_by_name 467 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) { 468 VM_ENTRY_MARK; 469 InstanceKlass* k = get_instanceKlass(); 470 fieldDescriptor fd; 471 Klass* def = k->find_field(name->get_symbol(), signature->get_symbol(), is_static, &fd); 472 if (def == NULL) { 473 return NULL; 474 } 475 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd); 476 return field; 477 } 478 479 480 static int sort_field_by_offset(ciField** a, ciField** b) { 481 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes(); 482 // (no worries about 32-bit overflow...) 483 } 484 485 // ------------------------------------------------------------------ 486 // ciInstanceKlass::compute_nonstatic_fields 487 int ciInstanceKlass::compute_nonstatic_fields() { 488 assert(is_loaded(), "must be loaded"); 489 490 if (_nonstatic_fields != NULL) 491 return _nonstatic_fields->length(); 492 493 if (!has_nonstatic_fields()) { 494 Arena* arena = CURRENT_ENV->arena(); 495 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL); 496 return 0; 497 } 498 assert(!is_java_lang_Object(), "bootstrap OK"); 499 500 ciInstanceKlass* super = this->super(); 501 GrowableArray<ciField*>* super_fields = NULL; 502 if (super != NULL && super->has_nonstatic_fields()) { 503 int super_flen = super->nof_nonstatic_fields(); 504 super_fields = super->_nonstatic_fields; 505 assert(super_flen == 0 || super_fields != NULL, "first get nof_fields"); 506 } 507 508 GrowableArray<ciField*>* fields = NULL; 509 GUARDED_VM_ENTRY({ 510 fields = compute_nonstatic_fields_impl(super_fields); 511 }); 512 513 if (fields == NULL) { 514 // This can happen if this class (java.lang.Class) has invisible fields. 515 if (super_fields != NULL) { 516 _nonstatic_fields = super_fields; 517 return super_fields->length(); 518 } else { 519 return 0; 520 } 521 } 522 523 _nonstatic_fields = fields; 524 return fields->length(); 525 } 526 527 GrowableArray<ciField*>* ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields, bool flatten) { 528 ASSERT_IN_VM; 529 Arena* arena = CURRENT_ENV->arena(); 530 int flen = 0; 531 GrowableArray<ciField*>* fields = NULL; 532 InstanceKlass* k = get_instanceKlass(); 533 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 534 if (fs.access_flags().is_static()) continue; 535 flen += 1; 536 } 537 538 // allocate the array: 539 if (flen == 0) { 540 return NULL; // return nothing if none are locally declared 541 } 542 if (super_fields != NULL) { 543 flen += super_fields->length(); 544 } 545 546 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL); 547 if (super_fields != NULL) { 548 fields->appendAll(super_fields); 549 } 550 551 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 552 if (fs.access_flags().is_static()) continue; 553 fieldDescriptor& fd = fs.field_descriptor(); 554 if (fd.is_inlined() && flatten) { 555 // Inline type fields are embedded 556 int field_offset = fd.offset(); 557 // Get InlineKlass and adjust number of fields 558 Klass* k = get_instanceKlass()->get_inline_type_field_klass(fd.index()); 559 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass(); 560 flen += vk->nof_nonstatic_fields() - 1; 561 // Iterate over fields of the flattened inline type and copy them to 'this' 562 for (int i = 0; i < vk->nof_nonstatic_fields(); ++i) { 563 ciField* flattened_field = vk->nonstatic_field_at(i); 564 // Adjust offset to account for missing oop header 565 int offset = field_offset + (flattened_field->offset() - vk->first_field_offset()); 566 // A flattened field can be treated as final if the non-flattened 567 // field is declared final or the holder klass is an inline type itself. 568 bool is_final = fd.is_final() || is_inlinetype(); 569 ciField* field = new (arena) ciField(flattened_field, this, offset, is_final); 570 fields->append(field); 571 } 572 } else { 573 ciField* field = new (arena) ciField(&fd); 574 fields->append(field); 575 } 576 } 577 assert(fields->length() == flen, "sanity"); 578 // Now sort them by offset, ascending. 579 // (In principle, they could mix with superclass fields.) 580 fields->sort(sort_field_by_offset); 581 return fields; 582 } 583 584 bool ciInstanceKlass::compute_injected_fields_helper() { 585 ASSERT_IN_VM; 586 InstanceKlass* k = get_instanceKlass(); 587 588 for (InternalFieldStream fs(k); !fs.done(); fs.next()) { 589 if (fs.access_flags().is_static()) continue; 590 return true; 591 } 592 return false; 593 } 594 595 void ciInstanceKlass::compute_injected_fields() { 596 assert(is_loaded(), "must be loaded"); 597 598 int has_injected_fields = 0; 599 if (super() != NULL && super()->has_injected_fields()) { 600 has_injected_fields = 1; 601 } else { 602 GUARDED_VM_ENTRY({ 603 has_injected_fields = compute_injected_fields_helper() ? 1 : 0; 604 }); 605 } 606 // may be concurrently initialized for shared ciInstanceKlass objects 607 assert(_has_injected_fields == -1 || _has_injected_fields == has_injected_fields, "broken concurrent initialization"); 608 _has_injected_fields = has_injected_fields; 609 } 610 611 bool ciInstanceKlass::has_object_fields() const { 612 GUARDED_VM_ENTRY( 613 return get_instanceKlass()->nonstatic_oop_map_size() > 0; 614 ); 615 } 616 617 bool ciInstanceKlass::compute_has_trusted_loader() { 618 ASSERT_IN_VM; 619 oop loader_oop = loader(); 620 if (loader_oop == NULL) { 621 return true; // bootstrap class loader 622 } 623 return java_lang_ClassLoader::is_trusted_loader(loader_oop); 624 } 625 626 // ------------------------------------------------------------------ 627 // ciInstanceKlass::find_method 628 // 629 // Find a method in this klass. 630 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) { 631 VM_ENTRY_MARK; 632 InstanceKlass* k = get_instanceKlass(); 633 Symbol* name_sym = name->get_symbol(); 634 Symbol* sig_sym= signature->get_symbol(); 635 636 Method* m = k->find_method(name_sym, sig_sym); 637 if (m == NULL) return NULL; 638 639 return CURRENT_THREAD_ENV->get_method(m); 640 } 641 642 // ------------------------------------------------------------------ 643 // ciInstanceKlass::is_leaf_type 644 bool ciInstanceKlass::is_leaf_type() { 645 assert(is_loaded(), "must be loaded"); 646 if (is_shared()) { 647 return is_final(); // approximately correct 648 } else { 649 return !has_subklass() && (nof_implementors() == 0); 650 } 651 } 652 653 // ------------------------------------------------------------------ 654 // ciInstanceKlass::implementor 655 // 656 // Report an implementor of this interface. 657 // Note that there are various races here, since my copy 658 // of _nof_implementors might be out of date with respect 659 // to results returned by InstanceKlass::implementor. 660 // This is OK, since any dependencies we decide to assert 661 // will be checked later under the Compile_lock. 662 ciInstanceKlass* ciInstanceKlass::implementor() { 663 ciInstanceKlass* impl = _implementor; 664 if (impl == NULL) { 665 if (is_shared()) { 666 impl = this; // assume a well-known interface never has a unique implementor 667 } else { 668 // Go into the VM to fetch the implementor. 669 VM_ENTRY_MARK; 670 MutexLocker ml(Compile_lock); 671 Klass* k = get_instanceKlass()->implementor(); 672 if (k != NULL) { 673 if (k == get_instanceKlass()) { 674 // More than one implementors. Use 'this' in this case. 675 impl = this; 676 } else { 677 impl = CURRENT_THREAD_ENV->get_instance_klass(k); 678 } 679 } 680 } 681 // Memoize this result. 682 _implementor = impl; 683 } 684 return impl; 685 } 686 687 bool ciInstanceKlass::can_be_inline_klass(bool is_exact) { 688 if (!EnableValhalla) { 689 return false; 690 } 691 if (!is_loaded() || is_inlinetype()) { 692 // Not loaded or known to be an inline klass 693 return true; 694 } 695 if (!is_exact) { 696 // Not exact, check if this is a valid super for an inline klass 697 VM_ENTRY_MARK; 698 return !get_instanceKlass()->carries_identity_modifier(); 699 } 700 return false; 701 } 702 703 // Utility class for printing of the contents of the static fields for 704 // use by compilation replay. It only prints out the information that 705 // could be consumed by the compiler, so for primitive types it prints 706 // out the actual value. For Strings it's the actual string value. 707 // For array types it it's first level array size since that's the 708 // only value which statically unchangeable. For all other reference 709 // types it simply prints out the dynamic type. 710 711 class StaticFieldPrinter : public FieldClosure { 712 protected: 713 outputStream* _out; 714 public: 715 StaticFieldPrinter(outputStream* out) : 716 _out(out) { 717 } 718 void do_field_helper(fieldDescriptor* fd, oop obj, bool flattened); 719 }; 720 721 class StaticFinalFieldPrinter : public StaticFieldPrinter { 722 const char* _holder; 723 public: 724 StaticFinalFieldPrinter(outputStream* out, const char* holder) : 725 StaticFieldPrinter(out), _holder(holder) { 726 } 727 void do_field(fieldDescriptor* fd) { 728 if (fd->is_final() && !fd->has_initial_value()) { 729 ResourceMark rm; 730 InstanceKlass* holder = fd->field_holder(); 731 oop mirror = holder->java_mirror(); 732 _out->print("staticfield %s %s ", _holder, fd->name()->as_quoted_ascii()); 733 BasicType bt = fd->field_type(); 734 if (bt != T_OBJECT && bt != T_ARRAY) { 735 _out->print("%s ", fd->signature()->as_quoted_ascii()); 736 } 737 do_field_helper(fd, mirror, false); 738 _out->cr(); 739 } 740 } 741 }; 742 743 class InlineTypeFieldPrinter : public StaticFieldPrinter { 744 oop _obj; 745 public: 746 InlineTypeFieldPrinter(outputStream* out, oop obj) : 747 StaticFieldPrinter(out), _obj(obj) { 748 } 749 void do_field(fieldDescriptor* fd) { 750 do_field_helper(fd, _obj, true); 751 _out->print(" "); 752 } 753 }; 754 755 void StaticFieldPrinter::do_field_helper(fieldDescriptor* fd, oop mirror, bool flattened) { 756 BasicType bt = fd->field_type(); 757 switch (bt) { 758 case T_BYTE: _out->print("%d", mirror->byte_field(fd->offset())); break; 759 case T_BOOLEAN: _out->print("%d", mirror->bool_field(fd->offset())); break; 760 case T_SHORT: _out->print("%d", mirror->short_field(fd->offset())); break; 761 case T_CHAR: _out->print("%d", mirror->char_field(fd->offset())); break; 762 case T_INT: _out->print("%d", mirror->int_field(fd->offset())); break; 763 case T_LONG: _out->print(INT64_FORMAT, (int64_t)(mirror->long_field(fd->offset()))); break; 764 case T_FLOAT: { 765 float f = mirror->float_field(fd->offset()); 766 _out->print("%d", *(int*)&f); 767 break; 768 } 769 case T_DOUBLE: { 770 double d = mirror->double_field(fd->offset()); 771 _out->print(INT64_FORMAT, *(int64_t*)&d); 772 break; 773 } 774 case T_ARRAY: // fall-through 775 case T_OBJECT: { 776 _out->print("%s ", fd->signature()->as_quoted_ascii()); 777 oop value = mirror->obj_field_acquire(fd->offset()); 778 if (value == NULL) { 779 _out->print_cr("null"); 780 } else if (value->is_instance()) { 781 assert(fd->field_type() == T_OBJECT, ""); 782 if (value->is_a(vmClasses::String_klass())) { 783 const char* ascii_value = java_lang_String::as_quoted_ascii(value); 784 _out->print("\"%s\"", (ascii_value != NULL) ? ascii_value : ""); 785 } else { 786 const char* klass_name = value->klass()->name()->as_quoted_ascii(); 787 _out->print("%s", klass_name); 788 } 789 } else if (value->is_array()) { 790 typeArrayOop ta = (typeArrayOop)value; 791 _out->print("%d", ta->length()); 792 if (value->is_objArray() || value->is_flatArray()) { 793 objArrayOop oa = (objArrayOop)value; 794 const char* klass_name = value->klass()->name()->as_quoted_ascii(); 795 _out->print(" %s", klass_name); 796 } 797 } else { 798 ShouldNotReachHere(); 799 } 800 break; 801 } 802 case T_PRIMITIVE_OBJECT: { 803 ResetNoHandleMark rnhm; 804 Thread* THREAD = Thread::current(); 805 SignatureStream ss(fd->signature(), false); 806 Symbol* name = ss.as_symbol(); 807 assert(!HAS_PENDING_EXCEPTION, "can resolve klass?"); 808 InstanceKlass* holder = fd->field_holder(); 809 InstanceKlass* k = SystemDictionary::find_instance_klass(THREAD, name, 810 Handle(THREAD, holder->class_loader()), 811 Handle(THREAD, holder->protection_domain())); 812 assert(k != NULL && !HAS_PENDING_EXCEPTION, "can resolve klass?"); 813 InlineKlass* vk = InlineKlass::cast(k); 814 oop obj; 815 if (flattened) { 816 int field_offset = fd->offset() - vk->first_field_offset(); 817 obj = cast_to_oop(cast_from_oop<address>(mirror) + field_offset); 818 } else { 819 obj = mirror->obj_field_acquire(fd->offset()); 820 } 821 InlineTypeFieldPrinter print_field(_out, obj); 822 vk->do_nonstatic_fields(&print_field); 823 break; 824 } 825 default: 826 ShouldNotReachHere(); 827 } 828 } 829 830 const char *ciInstanceKlass::replay_name() const { 831 return CURRENT_ENV->replay_name(get_instanceKlass()); 832 } 833 834 void ciInstanceKlass::dump_replay_instanceKlass(outputStream* out, InstanceKlass* ik) { 835 if (ik->is_hidden()) { 836 const char *name = CURRENT_ENV->dyno_name(ik); 837 if (name != NULL) { 838 out->print_cr("instanceKlass %s # %s", name, ik->name()->as_quoted_ascii()); 839 } else { 840 out->print_cr("# instanceKlass %s", ik->name()->as_quoted_ascii()); 841 } 842 } else { 843 out->print_cr("instanceKlass %s", ik->name()->as_quoted_ascii()); 844 } 845 } 846 847 GrowableArray<ciInstanceKlass*>* ciInstanceKlass::transitive_interfaces() const{ 848 if (_transitive_interfaces == NULL) { 849 const_cast<ciInstanceKlass*>(this)->compute_transitive_interfaces(); 850 } 851 return _transitive_interfaces; 852 } 853 854 void ciInstanceKlass::compute_transitive_interfaces() { 855 GUARDED_VM_ENTRY( 856 InstanceKlass* ik = get_instanceKlass(); 857 Array<InstanceKlass*>* interfaces = ik->transitive_interfaces(); 858 int orig_length = interfaces->length(); 859 Arena* arena = CURRENT_ENV->arena(); 860 int transitive_interfaces_len = orig_length + (is_interface() ? 1 : 0); 861 GrowableArray<ciInstanceKlass*>* transitive_interfaces = new(arena)GrowableArray<ciInstanceKlass*>(arena, transitive_interfaces_len, 862 0, NULL); 863 for (int i = 0; i < orig_length; i++) { 864 transitive_interfaces->append(CURRENT_ENV->get_instance_klass(interfaces->at(i))); 865 } 866 if (is_interface()) { 867 transitive_interfaces->append(this); 868 } 869 _transitive_interfaces = transitive_interfaces; 870 ); 871 } 872 873 void ciInstanceKlass::dump_replay_data(outputStream* out) { 874 ResourceMark rm; 875 876 InstanceKlass* ik = get_instanceKlass(); 877 ConstantPool* cp = ik->constants(); 878 879 // Try to record related loaded classes 880 Klass* sub = ik->subklass(); 881 while (sub != NULL) { 882 if (sub->is_instance_klass()) { 883 InstanceKlass *isub = InstanceKlass::cast(sub); 884 dump_replay_instanceKlass(out, isub); 885 } 886 sub = sub->next_sibling(); 887 } 888 889 // Dump out the state of the constant pool tags. During replay the 890 // tags will be validated for things which shouldn't change and 891 // classes will be resolved if the tags indicate that they were 892 // resolved at compile time. 893 const char *name = replay_name(); 894 out->print("ciInstanceKlass %s %d %d %d", name, 895 is_linked(), is_initialized(), cp->length()); 896 for (int index = 1; index < cp->length(); index++) { 897 out->print(" %d", cp->tags()->at(index)); 898 } 899 out->cr(); 900 if (is_initialized()) { 901 // Dump out the static final fields in case the compilation relies 902 // on their value for correct replay. 903 StaticFinalFieldPrinter sffp(out, name); 904 ik->do_local_static_fields(&sffp); 905 } 906 } 907 908 #ifdef ASSERT 909 bool ciInstanceKlass::debug_final_field_at(int offset) { 910 GUARDED_VM_ENTRY( 911 InstanceKlass* ik = get_instanceKlass(); 912 fieldDescriptor fd; 913 if (ik->find_field_from_offset(offset, false, &fd)) { 914 return fd.is_final(); 915 } 916 ); 917 return false; 918 } 919 920 bool ciInstanceKlass::debug_stable_field_at(int offset) { 921 GUARDED_VM_ENTRY( 922 InstanceKlass* ik = get_instanceKlass(); 923 fieldDescriptor fd; 924 if (ik->find_field_from_offset(offset, false, &fd)) { 925 return fd.is_stable(); 926 } 927 ); 928 return false; 929 } 930 #endif