1 /* 2 * Copyright (c) 1999, 2025, 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 "ci/ciField.hpp" 26 #include "ci/ciInlineKlass.hpp" 27 #include "ci/ciInstance.hpp" 28 #include "ci/ciInstanceKlass.hpp" 29 #include "ci/ciUtilities.inline.hpp" 30 #include "classfile/javaClasses.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "classfile/vmClasses.hpp" 33 #include "memory/allocation.hpp" 34 #include "memory/allocation.inline.hpp" 35 #include "memory/resourceArea.hpp" 36 #include "oops/fieldStreams.inline.hpp" 37 #include "oops/inlineKlass.inline.hpp" 38 #include "oops/instanceKlass.inline.hpp" 39 #include "oops/klass.inline.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "runtime/fieldDescriptor.inline.hpp" 42 #include "runtime/handles.inline.hpp" 43 #include "runtime/jniHandles.inline.hpp" 44 45 // ciInstanceKlass 46 // 47 // This class represents a Klass* in the HotSpot virtual machine 48 // whose Klass part in an InstanceKlass. 49 50 51 // ------------------------------------------------------------------ 52 // ciInstanceKlass::ciInstanceKlass 53 // 54 // Loaded instance klass. 55 ciInstanceKlass::ciInstanceKlass(Klass* k) : 56 ciKlass(k) 57 { 58 assert(get_Klass()->is_instance_klass(), "wrong type"); 59 assert(get_instanceKlass()->is_loaded(), "must be at least loaded"); 60 InstanceKlass* ik = get_instanceKlass(); 61 62 AccessFlags access_flags = ik->access_flags(); 63 _flags = ciFlags(access_flags); 64 _has_finalizer = ik->has_finalizer(); 65 _has_subklass = flags().is_final() ? subklass_false : subklass_unknown; 66 _init_state = ik->init_state(); 67 _has_nonstatic_fields = ik->has_nonstatic_fields(); 68 _has_nonstatic_concrete_methods = ik->has_nonstatic_concrete_methods(); 69 _is_hidden = ik->is_hidden(); 70 _is_record = ik->is_record(); 71 _declared_nonstatic_fields = nullptr; // initialized lazily by compute_nonstatic_fields 72 _nonstatic_fields = nullptr; // initialized lazily by compute_nonstatic_fields 73 _has_injected_fields = -1; 74 _implementor = nullptr; // we will fill these lazily 75 _transitive_interfaces = nullptr; 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 == nullptr). 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 != nullptr, "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 _is_shared = false; 97 } else { 98 Handle h_loader(thread, ik->class_loader()); 99 _loader = JNIHandles::make_global(h_loader); 100 _is_shared = true; 101 } 102 103 _has_trusted_loader = compute_has_trusted_loader(); 104 105 // Lazy fields get filled in only upon request. 106 _super = nullptr; 107 _java_mirror = nullptr; 108 109 if (is_shared()) { 110 if (k != vmClasses::Object_klass()) { 111 super(); 112 } 113 //compute_nonstatic_fields(); // done outside of constructor 114 } 115 116 _field_cache = nullptr; 117 } 118 119 // Version for unloaded classes: 120 ciInstanceKlass::ciInstanceKlass(ciSymbol* name, 121 jobject loader, 122 BasicType bt) 123 : ciKlass(name, bt) 124 { 125 assert(name->char_at(0) != JVM_SIGNATURE_ARRAY, "not an instance klass"); 126 _init_state = (InstanceKlass::ClassState)0; 127 _has_nonstatic_fields = false; 128 _declared_nonstatic_fields = nullptr; // initialized lazily by compute_nonstatic_fields 129 _nonstatic_fields = nullptr; // initialized lazily by compute_nonstatic_fields 130 _has_injected_fields = -1; 131 _is_hidden = false; 132 _is_record = false; 133 _loader = loader; 134 _is_shared = false; 135 _super = nullptr; 136 _java_mirror = nullptr; 137 _field_cache = nullptr; 138 _has_trusted_loader = compute_has_trusted_loader(); 139 } 140 141 142 143 // ------------------------------------------------------------------ 144 // ciInstanceKlass::compute_shared_is_initialized 145 void ciInstanceKlass::compute_shared_init_state() { 146 GUARDED_VM_ENTRY( 147 InstanceKlass* ik = get_instanceKlass(); 148 _init_state = ik->init_state(); 149 ) 150 } 151 152 // ------------------------------------------------------------------ 153 // ciInstanceKlass::compute_shared_has_subklass 154 bool ciInstanceKlass::compute_shared_has_subklass() { 155 GUARDED_VM_ENTRY( 156 InstanceKlass* ik = get_instanceKlass(); 157 _has_subklass = ik->subklass() != nullptr ? subklass_true : subklass_false; 158 return _has_subklass == subklass_true; 159 ) 160 } 161 162 // ------------------------------------------------------------------ 163 // ciInstanceKlass::loader 164 oop ciInstanceKlass::loader() { 165 ASSERT_IN_VM; 166 return JNIHandles::resolve(_loader); 167 } 168 169 // ------------------------------------------------------------------ 170 // ciInstanceKlass::loader_handle 171 jobject ciInstanceKlass::loader_handle() { 172 return _loader; 173 } 174 175 // ------------------------------------------------------------------ 176 // ciInstanceKlass::field_cache 177 // 178 // Get the field cache associated with this klass. 179 ciConstantPoolCache* ciInstanceKlass::field_cache() { 180 if (is_shared()) { 181 return nullptr; 182 } 183 if (_field_cache == nullptr) { 184 assert(!is_java_lang_Object(), "Object has no fields"); 185 Arena* arena = CURRENT_ENV->arena(); 186 _field_cache = new (arena) ciConstantPoolCache(arena, 5); 187 } 188 return _field_cache; 189 } 190 191 // ------------------------------------------------------------------ 192 // ciInstanceKlass::get_canonical_holder 193 // 194 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) { 195 #ifdef ASSERT 196 if (!(offset >= 0 && offset < layout_helper_size_in_bytes())) { 197 tty->print("*** get_canonical_holder(%d) on ", offset); 198 this->print(); 199 tty->print_cr(" ***"); 200 }; 201 assert(offset >= 0 && offset < layout_helper_size_in_bytes(), "offset must be tame"); 202 #endif 203 204 if (offset < instanceOopDesc::base_offset_in_bytes()) { 205 // All header offsets belong properly to java/lang/Object. 206 return CURRENT_ENV->Object_klass(); 207 } 208 209 ciInstanceKlass* self = this; 210 assert(self->is_loaded(), "must be loaded to access field info"); 211 ciField* field = self->get_field_by_offset(offset, false); 212 if (field != nullptr) { 213 return field->holder(); 214 } else { 215 for (;;) { 216 assert(self->is_loaded(), "must be loaded to have size"); 217 ciInstanceKlass* super = self->super(); 218 if (super == nullptr || 219 super->nof_nonstatic_fields() == 0 || 220 super->layout_helper_size_in_bytes() <= offset) { 221 return self; 222 } else { 223 self = super; // return super->get_canonical_holder(offset) 224 } 225 } 226 } 227 } 228 229 // ------------------------------------------------------------------ 230 // ciInstanceKlass::is_java_lang_Object 231 // 232 // Is this klass java.lang.Object? 233 bool ciInstanceKlass::is_java_lang_Object() const { 234 return equals(CURRENT_ENV->Object_klass()); 235 } 236 237 // ------------------------------------------------------------------ 238 // ciInstanceKlass::uses_default_loader 239 bool ciInstanceKlass::uses_default_loader() const { 240 // Note: We do not need to resolve the handle or enter the VM 241 // in order to test null-ness. 242 return _loader == nullptr; 243 } 244 245 // ------------------------------------------------------------------ 246 247 /** 248 * Return basic type of boxed value for box klass or T_OBJECT if not. 249 */ 250 BasicType ciInstanceKlass::box_klass_type() const { 251 if (uses_default_loader() && is_loaded()) { 252 return vmClasses::box_klass_type(get_Klass()); 253 } else { 254 return T_OBJECT; 255 } 256 } 257 258 /** 259 * Is this boxing klass? 260 */ 261 bool ciInstanceKlass::is_box_klass() const { 262 return is_java_primitive(box_klass_type()); 263 } 264 265 /** 266 * Is this boxed value offset? 267 */ 268 bool ciInstanceKlass::is_boxed_value_offset(int offset) const { 269 BasicType bt = box_klass_type(); 270 return is_java_primitive(bt) && 271 (offset == java_lang_boxing_object::value_offset(bt)); 272 } 273 274 // ------------------------------------------------------------------ 275 // ciInstanceKlass::is_in_package 276 // 277 // Is this klass in the given package? 278 bool ciInstanceKlass::is_in_package(const char* packagename, int len) { 279 // To avoid class loader mischief, this test always rejects application classes. 280 if (!uses_default_loader()) 281 return false; 282 GUARDED_VM_ENTRY( 283 return is_in_package_impl(packagename, len); 284 ) 285 } 286 287 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) { 288 ASSERT_IN_VM; 289 290 // If packagename contains trailing '/' exclude it from the 291 // prefix-test since we test for it explicitly. 292 if (packagename[len - 1] == '/') 293 len--; 294 295 if (!name()->starts_with(packagename, len)) 296 return false; 297 298 // Test if the class name is something like "java/lang". 299 if ((len + 1) > name()->utf8_length()) 300 return false; 301 302 // Test for trailing '/' 303 if (name()->char_at(len) != '/') 304 return false; 305 306 // Make sure it's not actually in a subpackage: 307 if (name()->index_of_at(len+1, "/", 1) >= 0) 308 return false; 309 310 return true; 311 } 312 313 // ------------------------------------------------------------------ 314 // ciInstanceKlass::print_impl 315 // 316 // Implementation of the print method. 317 void ciInstanceKlass::print_impl(outputStream* st) { 318 ciKlass::print_impl(st); 319 GUARDED_VM_ENTRY(st->print(" loader=" INTPTR_FORMAT, p2i(loader()));) 320 if (is_loaded()) { 321 st->print(" initialized=%s finalized=%s subklass=%s size=%d flags=", 322 bool_to_str(is_initialized()), 323 bool_to_str(has_finalizer()), 324 bool_to_str(has_subklass()), 325 layout_helper()); 326 327 _flags.print_klass_flags(st); 328 329 if (_super) { 330 st->print(" super="); 331 _super->print_name_on(st); 332 } 333 if (_java_mirror) { 334 st->print(" mirror=PRESENT"); 335 } 336 } 337 } 338 339 // ------------------------------------------------------------------ 340 // ciInstanceKlass::super 341 // 342 // Get the superklass of this klass. 343 ciInstanceKlass* ciInstanceKlass::super() { 344 assert(is_loaded(), "must be loaded"); 345 if (_super == nullptr && !is_java_lang_Object()) { 346 GUARDED_VM_ENTRY( 347 Klass* super_klass = get_instanceKlass()->super(); 348 _super = CURRENT_ENV->get_instance_klass(super_klass); 349 ) 350 } 351 return _super; 352 } 353 354 // ------------------------------------------------------------------ 355 // ciInstanceKlass::java_mirror 356 // 357 // Get the instance of java.lang.Class corresponding to this klass. 358 // Cache it on this->_java_mirror. 359 ciInstance* ciInstanceKlass::java_mirror() { 360 if (is_shared()) { 361 return ciKlass::java_mirror(); 362 } 363 if (_java_mirror == nullptr) { 364 _java_mirror = ciKlass::java_mirror(); 365 } 366 return _java_mirror; 367 } 368 369 // ------------------------------------------------------------------ 370 // ciInstanceKlass::unique_concrete_subklass 371 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() { 372 if (!is_loaded()) return nullptr; // No change if class is not loaded 373 if (!is_abstract()) return nullptr; // Only applies to abstract classes. 374 if (!has_subklass()) return nullptr; // Must have at least one subklass. 375 VM_ENTRY_MARK; 376 InstanceKlass* ik = get_instanceKlass(); 377 Klass* up = ik->up_cast_abstract(); 378 assert(up->is_instance_klass(), "must be InstanceKlass"); 379 if (ik == up) { 380 return nullptr; 381 } 382 return CURRENT_THREAD_ENV->get_instance_klass(up); 383 } 384 385 // ------------------------------------------------------------------ 386 // ciInstanceKlass::has_finalizable_subclass 387 bool ciInstanceKlass::has_finalizable_subclass() { 388 if (!is_loaded()) return true; 389 VM_ENTRY_MARK; 390 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != nullptr; 391 } 392 393 // ------------------------------------------------------------------ 394 // ciInstanceKlass::contains_field_offset 395 bool ciInstanceKlass::contains_field_offset(int offset) { 396 VM_ENTRY_MARK; 397 return get_instanceKlass()->contains_field_offset(offset); 398 } 399 400 // ------------------------------------------------------------------ 401 // ciInstanceKlass::get_field_by_offset 402 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) { 403 if (!is_static) { 404 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) { 405 ciField* field = nonstatic_field_at(i); 406 int field_off = field->offset_in_bytes(); 407 if (field_off == field_offset) { 408 return field; 409 } 410 } 411 return nullptr; 412 } 413 414 VM_ENTRY_MARK; 415 InstanceKlass* k = get_instanceKlass(); 416 fieldDescriptor fd; 417 if (!k->find_field_from_offset(field_offset, is_static, &fd)) { 418 return nullptr; 419 } 420 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd); 421 return field; 422 } 423 424 ciField* ciInstanceKlass::get_non_flat_field_by_offset(int field_offset) { 425 for (int i = 0, len = nof_declared_nonstatic_fields(); i < len; i++) { 426 ciField* field = declared_nonstatic_field_at(i); 427 int field_off = field->offset_in_bytes(); 428 if (field_off == field_offset) { 429 return field; 430 } 431 } 432 return nullptr; 433 } 434 435 int ciInstanceKlass::field_index_by_offset(int offset) { 436 assert(contains_field_offset(offset), "invalid field offset"); 437 int best_offset = 0; 438 int best_index = -1; 439 // Search the field with the given offset 440 for (int i = 0; i < nof_declared_nonstatic_fields(); ++i) { 441 int field_offset = declared_nonstatic_field_at(i)->offset_in_bytes(); 442 if (field_offset == offset) { 443 // Exact match 444 return i; 445 } else if (field_offset < offset && field_offset > best_offset) { 446 // No exact match. Save the index of the field with the closest offset that 447 // is smaller than the given field offset. This index corresponds to the 448 // flat field that holds the field we are looking for. 449 best_offset = field_offset; 450 best_index = i; 451 } 452 } 453 assert(best_index >= 0, "field not found"); 454 assert(best_offset == offset || declared_nonstatic_field_at(best_index)->type()->is_inlinetype(), "offset should match for non-inline types"); 455 return best_index; 456 } 457 458 // ------------------------------------------------------------------ 459 // ciInstanceKlass::get_field_by_name 460 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) { 461 VM_ENTRY_MARK; 462 InstanceKlass* k = get_instanceKlass(); 463 fieldDescriptor fd; 464 Klass* def = k->find_field(name->get_symbol(), signature->get_symbol(), is_static, &fd); 465 if (def == nullptr) { 466 return nullptr; 467 } 468 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd); 469 return field; 470 } 471 472 const GrowableArray<ciField*> empty_field_array(0, MemTag::mtCompiler); 473 474 void ciInstanceKlass::compute_nonstatic_fields() { 475 assert(is_loaded(), "must be loaded"); 476 477 if (_nonstatic_fields != nullptr) { 478 assert(_declared_nonstatic_fields != nullptr, "must be initialized at the same time, class %s", name()->as_utf8()); 479 return; 480 } 481 482 if (!has_nonstatic_fields()) { 483 _declared_nonstatic_fields = &empty_field_array; 484 _nonstatic_fields = &empty_field_array; 485 return; 486 } 487 assert(!is_java_lang_Object(), "bootstrap OK"); 488 489 ciInstanceKlass* super = this->super(); 490 assert(super != nullptr, "must have a super class, current class: %s", name()->as_utf8()); 491 super->compute_nonstatic_fields(); 492 const GrowableArray<ciField*>* super_declared_fields = super->_declared_nonstatic_fields;; 493 const GrowableArray<ciField*>* super_fields = super->_nonstatic_fields; 494 assert(super_declared_fields != nullptr && super_fields != nullptr, "must have been initialized, current class: %s, super class: %s", name()->as_utf8(), super->name()->as_utf8()); 495 496 GUARDED_VM_ENTRY({ 497 compute_nonstatic_fields_impl(super_declared_fields, super_fields); 498 }); 499 } 500 501 void ciInstanceKlass::compute_nonstatic_fields_impl(const GrowableArray<ciField*>* super_declared_fields, const GrowableArray<ciField*>* super_fields) { 502 assert(_declared_nonstatic_fields == nullptr && _nonstatic_fields == nullptr, "initialized already"); 503 ASSERT_IN_VM; 504 Arena* arena = CURRENT_ENV->arena(); 505 506 InstanceKlass* this_klass = get_instanceKlass(); 507 int declared_field_num = 0; 508 int field_num = 0; 509 for (JavaFieldStream fs(this_klass); !fs.done(); fs.next()) { 510 if (fs.access_flags().is_static()) { 511 continue; 512 } 513 514 declared_field_num++; 515 516 fieldDescriptor& fd = fs.field_descriptor(); 517 if (fd.is_flat()) { 518 InlineKlass* k = this_klass->get_inline_type_field_klass(fd.index()); 519 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass(); 520 field_num += vk->nof_nonstatic_fields(); 521 field_num += fd.has_null_marker() ? 1 : 0; 522 } else { 523 field_num++; 524 } 525 } 526 527 GrowableArray<ciField*>* tmp_declared_fields = nullptr; 528 if (declared_field_num != 0) { 529 tmp_declared_fields = new (arena) GrowableArray<ciField*>(arena, declared_field_num + super_declared_fields->length(), 0, nullptr); 530 tmp_declared_fields->appendAll(super_declared_fields); 531 } 532 533 GrowableArray<ciField*>* tmp_fields = nullptr; 534 if (field_num != 0) { 535 tmp_fields = new (arena) GrowableArray<ciField*>(arena, field_num + super_fields->length(), 0, nullptr); 536 tmp_fields->appendAll(super_fields); 537 } 538 539 // For later assertion 540 declared_field_num += super_declared_fields->length(); 541 field_num += super_fields->length(); 542 543 for (JavaFieldStream fs(this_klass); !fs.done(); fs.next()) { 544 if (fs.access_flags().is_static()) { 545 continue; 546 } 547 548 fieldDescriptor& fd = fs.field_descriptor(); 549 ciField* declared_field = new (arena) ciField(&fd); 550 assert(tmp_declared_fields != nullptr, "should be initialized"); 551 tmp_declared_fields->append(declared_field); 552 553 if (fd.is_flat()) { 554 // Flat fields are embedded 555 Klass* k = get_instanceKlass()->get_inline_type_field_klass(fd.index()); 556 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass(); 557 // Iterate over fields of the flat inline type and copy them to 'this' 558 for (int i = 0; i < vk->nof_nonstatic_fields(); ++i) { 559 assert(tmp_fields != nullptr, "should be initialized"); 560 tmp_fields->append(new (arena) ciField(declared_field, vk->nonstatic_field_at(i))); 561 } 562 if (fd.has_null_marker()) { 563 assert(tmp_fields != nullptr, "should be initialized"); 564 tmp_fields->append(new (arena) ciField(declared_field)); 565 } 566 } else { 567 assert(tmp_fields != nullptr, "should be initialized"); 568 tmp_fields->append(declared_field); 569 } 570 } 571 572 // Now sort them by offset, ascending. In principle, they could mix with superclass fields. 573 if (tmp_declared_fields != nullptr) { 574 assert(tmp_declared_fields->length() == declared_field_num, "sanity check failed for class: %s, number of declared fields: %d, expected: %d", 575 name()->as_utf8(), tmp_declared_fields->length(), declared_field_num); 576 _declared_nonstatic_fields = tmp_declared_fields; 577 } else { 578 _declared_nonstatic_fields = super_declared_fields; 579 } 580 581 if (tmp_fields != nullptr) { 582 assert(tmp_fields->length() == field_num, "sanity check failed for class: %s, number of fields: %d, expected: %d", 583 name()->as_utf8(), tmp_fields->length(), field_num); 584 _nonstatic_fields = tmp_fields; 585 } else { 586 _nonstatic_fields = super_fields; 587 } 588 } 589 590 bool ciInstanceKlass::compute_injected_fields_helper() { 591 ASSERT_IN_VM; 592 InstanceKlass* k = get_instanceKlass(); 593 594 for (InternalFieldStream fs(k); !fs.done(); fs.next()) { 595 if (fs.access_flags().is_static()) continue; 596 return true; 597 } 598 return false; 599 } 600 601 void ciInstanceKlass::compute_injected_fields() { 602 assert(is_loaded(), "must be loaded"); 603 604 int has_injected_fields = 0; 605 if (super() != nullptr && super()->has_injected_fields()) { 606 has_injected_fields = 1; 607 } else { 608 GUARDED_VM_ENTRY({ 609 has_injected_fields = compute_injected_fields_helper() ? 1 : 0; 610 }); 611 } 612 // may be concurrently initialized for shared ciInstanceKlass objects 613 assert(_has_injected_fields == -1 || _has_injected_fields == has_injected_fields, "broken concurrent initialization"); 614 _has_injected_fields = has_injected_fields; 615 } 616 617 bool ciInstanceKlass::has_object_fields() const { 618 GUARDED_VM_ENTRY( 619 return get_instanceKlass()->nonstatic_oop_map_size() > 0; 620 ); 621 } 622 623 bool ciInstanceKlass::compute_has_trusted_loader() { 624 ASSERT_IN_VM; 625 oop loader_oop = loader(); 626 if (loader_oop == nullptr) { 627 return true; // bootstrap class loader 628 } 629 return java_lang_ClassLoader::is_trusted_loader(loader_oop); 630 } 631 632 // ------------------------------------------------------------------ 633 // ciInstanceKlass::find_method 634 // 635 // Find a method in this klass. 636 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) { 637 VM_ENTRY_MARK; 638 InstanceKlass* k = get_instanceKlass(); 639 Symbol* name_sym = name->get_symbol(); 640 Symbol* sig_sym= signature->get_symbol(); 641 642 Method* m = k->find_method(name_sym, sig_sym); 643 if (m == nullptr) return nullptr; 644 645 return CURRENT_THREAD_ENV->get_method(m); 646 } 647 648 // ------------------------------------------------------------------ 649 // ciInstanceKlass::is_leaf_type 650 bool ciInstanceKlass::is_leaf_type() { 651 assert(is_loaded(), "must be loaded"); 652 if (is_shared()) { 653 return is_final(); // approximately correct 654 } else { 655 return !has_subklass() && (nof_implementors() == 0); 656 } 657 } 658 659 // ------------------------------------------------------------------ 660 // ciInstanceKlass::implementor 661 // 662 // Report an implementor of this interface. 663 // Note that there are various races here, since my copy 664 // of _nof_implementors might be out of date with respect 665 // to results returned by InstanceKlass::implementor. 666 // This is OK, since any dependencies we decide to assert 667 // will be checked later under the Compile_lock. 668 ciInstanceKlass* ciInstanceKlass::implementor() { 669 ciInstanceKlass* impl = _implementor; 670 if (impl == nullptr) { 671 if (is_shared()) { 672 impl = this; // assume a well-known interface never has a unique implementor 673 } else { 674 // Go into the VM to fetch the implementor. 675 VM_ENTRY_MARK; 676 InstanceKlass* ik = get_instanceKlass(); 677 Klass* implk = ik->implementor(); 678 if (implk != nullptr) { 679 if (implk == ik) { 680 // More than one implementors. Use 'this' in this case. 681 impl = this; 682 } else { 683 impl = CURRENT_THREAD_ENV->get_instance_klass(implk); 684 } 685 } 686 } 687 // Memoize this result. 688 _implementor = impl; 689 } 690 return impl; 691 } 692 693 bool ciInstanceKlass::can_be_inline_klass(bool is_exact) { 694 if (!EnableValhalla) { 695 return false; 696 } 697 if (!is_loaded() || is_inlinetype()) { 698 // Not loaded or known to be an inline klass 699 return true; 700 } 701 if (!is_exact) { 702 // Not exact, check if this is a valid super for an inline klass 703 VM_ENTRY_MARK; 704 return !get_instanceKlass()->access_flags().is_identity_class() || is_java_lang_Object() ; 705 } 706 return false; 707 } 708 709 // Utility class for printing of the contents of the static fields for 710 // use by compilation replay. It only prints out the information that 711 // could be consumed by the compiler, so for primitive types it prints 712 // out the actual value. For Strings it's the actual string value. 713 // For array types it it's first level array size since that's the 714 // only value which statically unchangeable. For all other reference 715 // types it simply prints out the dynamic type. 716 717 class StaticFieldPrinter : public FieldClosure { 718 protected: 719 outputStream* _out; 720 public: 721 StaticFieldPrinter(outputStream* out) : 722 _out(out) { 723 } 724 void do_field_helper(fieldDescriptor* fd, oop obj, bool is_flat); 725 }; 726 727 class StaticFinalFieldPrinter : public StaticFieldPrinter { 728 const char* _holder; 729 public: 730 StaticFinalFieldPrinter(outputStream* out, const char* holder) : 731 StaticFieldPrinter(out), _holder(holder) { 732 } 733 void do_field(fieldDescriptor* fd) { 734 if (fd->is_final() && !fd->has_initial_value()) { 735 ResourceMark rm; 736 InstanceKlass* holder = fd->field_holder(); 737 oop mirror = holder->java_mirror(); 738 _out->print("staticfield %s %s ", _holder, fd->name()->as_quoted_ascii()); 739 BasicType bt = fd->field_type(); 740 if (bt != T_OBJECT && bt != T_ARRAY) { 741 _out->print("%s ", fd->signature()->as_quoted_ascii()); 742 } 743 do_field_helper(fd, mirror, false); 744 _out->cr(); 745 } 746 } 747 }; 748 749 class InlineTypeFieldPrinter : public StaticFieldPrinter { 750 oop _obj; 751 public: 752 InlineTypeFieldPrinter(outputStream* out, oop obj) : 753 StaticFieldPrinter(out), _obj(obj) { 754 } 755 void do_field(fieldDescriptor* fd) { 756 do_field_helper(fd, _obj, true); 757 _out->print(" "); 758 } 759 }; 760 761 void StaticFieldPrinter::do_field_helper(fieldDescriptor* fd, oop mirror, bool is_flat) { 762 BasicType field_type = fd->field_type(); 763 switch (field_type) { 764 case T_BYTE: _out->print("%d", mirror->byte_field(fd->offset())); break; 765 case T_BOOLEAN: _out->print("%d", mirror->bool_field(fd->offset())); break; 766 case T_SHORT: _out->print("%d", mirror->short_field(fd->offset())); break; 767 case T_CHAR: _out->print("%d", mirror->char_field(fd->offset())); break; 768 case T_INT: _out->print("%d", mirror->int_field(fd->offset())); break; 769 case T_LONG: _out->print(INT64_FORMAT, (int64_t)(mirror->long_field(fd->offset()))); break; 770 case T_FLOAT: { 771 float f = mirror->float_field(fd->offset()); 772 _out->print("%d", *(int*)&f); 773 break; 774 } 775 case T_DOUBLE: { 776 double d = mirror->double_field(fd->offset()); 777 _out->print(INT64_FORMAT, *(int64_t*)&d); 778 break; 779 } 780 case T_ARRAY: // fall-through 781 case T_OBJECT: 782 if (!fd->is_null_free_inline_type()) { 783 _out->print("%s ", fd->signature()->as_quoted_ascii()); 784 oop value = mirror->obj_field_acquire(fd->offset()); 785 if (value == nullptr) { 786 if (field_type == T_ARRAY) { 787 _out->print("%d", -1); 788 } 789 _out->cr(); 790 } else if (value->is_instance()) { 791 assert(field_type == T_OBJECT, ""); 792 if (value->is_a(vmClasses::String_klass())) { 793 const char* ascii_value = java_lang_String::as_quoted_ascii(value); 794 _out->print("\"%s\"", (ascii_value != nullptr) ? ascii_value : ""); 795 } else { 796 const char* klass_name = value->klass()->name()->as_quoted_ascii(); 797 _out->print("%s", klass_name); 798 } 799 } else if (value->is_array()) { 800 typeArrayOop ta = (typeArrayOop)value; 801 _out->print("%d", ta->length()); 802 if (value->is_objArray() || value->is_flatArray()) { 803 objArrayOop oa = (objArrayOop)value; 804 const char* klass_name = value->klass()->name()->as_quoted_ascii(); 805 _out->print(" %s", klass_name); 806 } 807 } else { 808 ShouldNotReachHere(); 809 } 810 break; 811 } else { 812 // handling of null free inline type 813 ResetNoHandleMark rnhm; 814 Thread* THREAD = Thread::current(); 815 SignatureStream ss(fd->signature(), false); 816 Symbol* name = ss.as_symbol(); 817 assert(!HAS_PENDING_EXCEPTION, "can resolve klass?"); 818 InstanceKlass* holder = fd->field_holder(); 819 InstanceKlass* k = SystemDictionary::find_instance_klass(THREAD, name, 820 Handle(THREAD, holder->class_loader())); 821 assert(k != nullptr && !HAS_PENDING_EXCEPTION, "can resolve klass?"); 822 InlineKlass* vk = InlineKlass::cast(k); 823 oop obj; 824 if (is_flat) { 825 int field_offset = fd->offset() - vk->payload_offset(); 826 obj = cast_to_oop(cast_from_oop<address>(mirror) + field_offset); 827 } else { 828 obj = mirror->obj_field_acquire(fd->offset()); 829 } 830 InlineTypeFieldPrinter print_field(_out, obj); 831 vk->do_nonstatic_fields(&print_field); 832 break; 833 } 834 default: 835 ShouldNotReachHere(); 836 } 837 } 838 839 const char *ciInstanceKlass::replay_name() const { 840 return CURRENT_ENV->replay_name(get_instanceKlass()); 841 } 842 843 void ciInstanceKlass::dump_replay_instanceKlass(outputStream* out, InstanceKlass* ik) { 844 if (ik->is_hidden()) { 845 const char *name = CURRENT_ENV->dyno_name(ik); 846 if (name != nullptr) { 847 out->print_cr("instanceKlass %s # %s", name, ik->name()->as_quoted_ascii()); 848 } else { 849 out->print_cr("# instanceKlass %s", ik->name()->as_quoted_ascii()); 850 } 851 } else { 852 out->print_cr("instanceKlass %s", ik->name()->as_quoted_ascii()); 853 } 854 } 855 856 GrowableArray<ciInstanceKlass*>* ciInstanceKlass::transitive_interfaces() const{ 857 if (_transitive_interfaces == nullptr) { 858 const_cast<ciInstanceKlass*>(this)->compute_transitive_interfaces(); 859 } 860 return _transitive_interfaces; 861 } 862 863 void ciInstanceKlass::compute_transitive_interfaces() { 864 GUARDED_VM_ENTRY( 865 InstanceKlass* ik = get_instanceKlass(); 866 Array<InstanceKlass*>* interfaces = ik->transitive_interfaces(); 867 int orig_length = interfaces->length(); 868 Arena* arena = CURRENT_ENV->arena(); 869 int transitive_interfaces_len = orig_length + (is_interface() ? 1 : 0); 870 GrowableArray<ciInstanceKlass*>* transitive_interfaces = new(arena)GrowableArray<ciInstanceKlass*>(arena, transitive_interfaces_len, 871 0, nullptr); 872 for (int i = 0; i < orig_length; i++) { 873 transitive_interfaces->append(CURRENT_ENV->get_instance_klass(interfaces->at(i))); 874 } 875 if (is_interface()) { 876 transitive_interfaces->append(this); 877 } 878 _transitive_interfaces = transitive_interfaces; 879 ); 880 } 881 882 void ciInstanceKlass::dump_replay_data(outputStream* out) { 883 ResourceMark rm; 884 885 InstanceKlass* ik = get_instanceKlass(); 886 ConstantPool* cp = ik->constants(); 887 888 // Try to record related loaded classes 889 Klass* sub = ik->subklass(); 890 while (sub != nullptr) { 891 if (sub->is_instance_klass()) { 892 InstanceKlass *isub = InstanceKlass::cast(sub); 893 dump_replay_instanceKlass(out, isub); 894 } 895 sub = sub->next_sibling(); 896 } 897 898 // Dump out the state of the constant pool tags. During replay the 899 // tags will be validated for things which shouldn't change and 900 // classes will be resolved if the tags indicate that they were 901 // resolved at compile time. 902 const char *name = replay_name(); 903 out->print("ciInstanceKlass %s %d %d %d", name, 904 is_linked(), is_initialized(), cp->length()); 905 for (int index = 1; index < cp->length(); index++) { 906 out->print(" %d", cp->tags()->at(index)); 907 } 908 out->cr(); 909 if (is_initialized()) { 910 // Dump out the static final fields in case the compilation relies 911 // on their value for correct replay. 912 StaticFinalFieldPrinter sffp(out, name); 913 ik->do_local_static_fields(&sffp); 914 } 915 } 916 917 #ifdef ASSERT 918 bool ciInstanceKlass::debug_final_field_at(int offset) { 919 GUARDED_VM_ENTRY( 920 InstanceKlass* ik = get_instanceKlass(); 921 fieldDescriptor fd; 922 if (ik->find_field_from_offset(offset, false, &fd)) { 923 return fd.is_final(); 924 } 925 ); 926 return false; 927 } 928 929 bool ciInstanceKlass::debug_stable_field_at(int offset) { 930 GUARDED_VM_ENTRY( 931 InstanceKlass* ik = get_instanceKlass(); 932 fieldDescriptor fd; 933 if (ik->find_field_from_offset(offset, false, &fd)) { 934 return fd.is_stable(); 935 } 936 ); 937 return false; 938 } 939 #endif