1 /*
2 * Copyright (c) 1999, 2026, 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/instanceKlass.inline.hpp"
38 #include "oops/klass.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "runtime/arguments.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 _trust_final_fields = ik->trust_final_fields();
74 _has_injected_fields = -1;
75 _implementor = nullptr; // we will fill these lazily
76 _transitive_interfaces = nullptr;
77
78 // Ensure that the metadata wrapped by the ciMetadata is kept alive by GC.
79 // This is primarily useful for metadata which is considered as weak roots
80 // by the GC but need to be strong roots if reachable from a current compilation.
81 // InstanceKlass are created for both weak and strong metadata. Ensuring this metadata
82 // alive covers the cases where there are weak roots without performance cost.
83 oop holder = ik->klass_holder();
84 if (ik->class_loader_data()->has_class_mirror_holder()) {
85 // Though ciInstanceKlass records class loader oop, it's not enough to keep
86 // non-strong hidden classes alive (loader == nullptr). Klass holder should
87 // be used instead. It is enough to record a ciObject, since cached elements are never removed
88 // during ciObjectFactory lifetime. ciObjectFactory itself is created for
89 // every compilation and lives for the whole duration of the compilation.
90 assert(holder != nullptr, "holder of hidden class is the mirror which is never null");
91 (void)CURRENT_ENV->get_object(holder);
92 }
93
94 JavaThread *thread = JavaThread::current();
95 if (ciObjectFactory::is_initialized()) {
96 _loader = JNIHandles::make_local(thread, ik->class_loader());
97 _is_shared = false;
98 } else {
99 Handle h_loader(thread, ik->class_loader());
100 _loader = JNIHandles::make_global(h_loader);
101 _is_shared = true;
102 }
103
104 _has_trusted_loader = compute_has_trusted_loader();
105
106 // Lazy fields get filled in only upon request.
107 _super = nullptr;
108 _java_mirror = nullptr;
109
110 if (is_shared()) {
111 if (k != vmClasses::Object_klass()) {
112 super();
113 }
114 //compute_nonstatic_fields(); // done outside of constructor
115 }
116
117 _field_cache = nullptr;
118 }
119
120 // Version for unloaded classes:
121 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
122 jobject loader,
123 BasicType bt)
124 : ciKlass(name, bt)
125 {
126 assert(name->char_at(0) != JVM_SIGNATURE_ARRAY, "not an instance klass");
127 _init_state = (InstanceKlass::ClassState)0;
128 _has_nonstatic_fields = false;
129 _declared_nonstatic_fields = nullptr; // initialized lazily by compute_nonstatic_fields
130 _nonstatic_fields = nullptr; // initialized lazily by compute_nonstatic_fields
131 _has_injected_fields = -1;
132 _is_hidden = false;
133 _is_record = false;
134 _loader = loader;
135 _is_shared = false;
136 _super = nullptr;
137 _java_mirror = nullptr;
138 _field_cache = nullptr;
139 _has_trusted_loader = compute_has_trusted_loader();
140 }
141
142
143
144 // ------------------------------------------------------------------
145 // ciInstanceKlass::compute_shared_is_initialized
146 void ciInstanceKlass::compute_shared_init_state() {
147 GUARDED_VM_ENTRY(
148 InstanceKlass* ik = get_instanceKlass();
149 _init_state = ik->init_state();
150 )
151 }
152
153 // ------------------------------------------------------------------
154 // ciInstanceKlass::compute_shared_has_subklass
155 bool ciInstanceKlass::compute_shared_has_subklass() {
156 GUARDED_VM_ENTRY(
157 InstanceKlass* ik = get_instanceKlass();
158 _has_subklass = ik->subklass() != nullptr ? subklass_true : subklass_false;
159 return _has_subklass == subklass_true;
160 )
161 }
162
163 // ------------------------------------------------------------------
164 // ciInstanceKlass::loader
165 oop ciInstanceKlass::loader() {
166 ASSERT_IN_VM;
167 return JNIHandles::resolve(_loader);
168 }
169
170 // ------------------------------------------------------------------
171 // ciInstanceKlass::loader_handle
172 jobject ciInstanceKlass::loader_handle() {
173 return _loader;
174 }
175
176 // ------------------------------------------------------------------
177 // ciInstanceKlass::field_cache
178 //
179 // Get the field cache associated with this klass.
180 ciConstantPoolCache* ciInstanceKlass::field_cache() {
181 if (is_shared()) {
182 return nullptr;
183 }
184 if (_field_cache == nullptr) {
185 assert(!is_java_lang_Object(), "Object has no fields");
186 Arena* arena = CURRENT_ENV->arena();
187 _field_cache = new (arena) ciConstantPoolCache(arena, 5);
188 }
189 return _field_cache;
190 }
191
192 // ------------------------------------------------------------------
193 // ciInstanceKlass::get_canonical_holder
194 //
195 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
196 #ifdef ASSERT
197 if (!(offset >= 0 && offset < layout_helper_size_in_bytes())) {
198 tty->print("*** get_canonical_holder(%d) on ", offset);
199 this->print();
200 tty->print_cr(" ***");
201 };
202 assert(offset >= 0 && offset < layout_helper_size_in_bytes(), "offset must be tame");
203 #endif
204
205 if (offset < instanceOopDesc::base_offset_in_bytes()) {
206 // All header offsets belong properly to java/lang/Object.
207 return CURRENT_ENV->Object_klass();
208 }
209
210 ciInstanceKlass* self = this;
211 assert(self->is_loaded(), "must be loaded to access field info");
212 ciField* field = self->get_field_by_offset(offset, false);
213 if (field != nullptr) {
214 return field->holder();
215 } else {
216 for (;;) {
217 assert(self->is_loaded(), "must be loaded to have size");
218 ciInstanceKlass* super = self->super();
219 if (super == nullptr ||
220 super->nof_nonstatic_fields() == 0 ||
221 super->layout_helper_size_in_bytes() <= offset) {
222 return self;
223 } else {
224 self = super; // return super->get_canonical_holder(offset)
225 }
226 }
227 }
228 }
229
230 // ------------------------------------------------------------------
231 // ciInstanceKlass::is_java_lang_Object
232 //
233 // Is this klass java.lang.Object?
234 bool ciInstanceKlass::is_java_lang_Object() const {
235 return equals(CURRENT_ENV->Object_klass());
236 }
237
238 // ------------------------------------------------------------------
239 // ciInstanceKlass::uses_default_loader
240 bool ciInstanceKlass::uses_default_loader() const {
241 // Note: We do not need to resolve the handle or enter the VM
242 // in order to test null-ness.
243 return _loader == nullptr;
244 }
245
246 // ------------------------------------------------------------------
247
248 /**
249 * Return basic type of boxed value for box klass or T_OBJECT if not.
250 */
251 BasicType ciInstanceKlass::box_klass_type() const {
252 if (uses_default_loader() && is_loaded()) {
253 return vmClasses::box_klass_type(get_Klass());
254 } else {
255 return T_OBJECT;
256 }
257 }
258
259 /**
260 * Is this boxing klass?
261 */
262 bool ciInstanceKlass::is_box_klass() const {
263 return is_java_primitive(box_klass_type());
264 }
265
266 /**
267 * Is this boxed value offset?
268 */
269 bool ciInstanceKlass::is_boxed_value_offset(int offset) const {
270 BasicType bt = box_klass_type();
271 return is_java_primitive(bt) &&
272 (offset == java_lang_boxing_object::value_offset(bt));
273 }
274
275 // ------------------------------------------------------------------
276 // ciInstanceKlass::is_in_package
277 //
278 // Is this klass in the given package?
279 bool ciInstanceKlass::is_in_package(const char* packagename, int len) {
280 // To avoid class loader mischief, this test always rejects application classes.
281 if (!uses_default_loader())
282 return false;
283 GUARDED_VM_ENTRY(
284 return is_in_package_impl(packagename, len);
285 )
286 }
287
288 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) {
289 ASSERT_IN_VM;
290
291 // If packagename contains trailing '/' exclude it from the
292 // prefix-test since we test for it explicitly.
293 if (packagename[len - 1] == '/')
294 len--;
295
296 if (!name()->starts_with(packagename, len))
297 return false;
298
299 // Test if the class name is something like "java/lang".
300 if ((len + 1) > name()->utf8_length())
301 return false;
302
303 // Test for trailing '/'
304 if (name()->char_at(len) != '/')
305 return false;
306
307 // Make sure it's not actually in a subpackage:
308 if (name()->index_of_at(len+1, "/", 1) >= 0)
309 return false;
310
311 return true;
312 }
313
314 // ------------------------------------------------------------------
315 // ciInstanceKlass::print_impl
316 //
317 // Implementation of the print method.
318 void ciInstanceKlass::print_impl(outputStream* st) {
319 ciKlass::print_impl(st);
320 GUARDED_VM_ENTRY(st->print(" loader=" INTPTR_FORMAT, p2i(loader()));)
321 if (is_loaded()) {
322 st->print(" initialized=%s finalized=%s subklass=%s size=%d flags=",
323 bool_to_str(is_initialized()),
324 bool_to_str(has_finalizer()),
325 bool_to_str(has_subklass()),
326 layout_helper());
327
328 _flags.print_klass_flags(st);
329
330 if (_super) {
331 st->print(" super=");
332 _super->print_name_on(st);
333 }
334 if (_java_mirror) {
335 st->print(" mirror=PRESENT");
336 }
337 }
338 }
339
340 // ------------------------------------------------------------------
341 // ciInstanceKlass::super
342 //
343 // Get the superklass of this klass.
344 ciInstanceKlass* ciInstanceKlass::super() {
345 assert(is_loaded(), "must be loaded");
346 if (_super == nullptr && !is_java_lang_Object()) {
347 GUARDED_VM_ENTRY(
348 Klass* super_klass = get_instanceKlass()->super();
349 _super = CURRENT_ENV->get_instance_klass(super_klass);
350 )
351 }
352 return _super;
353 }
354
355 // ------------------------------------------------------------------
356 // ciInstanceKlass::java_mirror
357 //
358 // Get the instance of java.lang.Class corresponding to this klass.
359 // Cache it on this->_java_mirror.
360 ciInstance* ciInstanceKlass::java_mirror() {
361 if (is_shared()) {
362 return ciKlass::java_mirror();
363 }
364 if (_java_mirror == nullptr) {
365 _java_mirror = ciKlass::java_mirror();
366 }
367 return _java_mirror;
368 }
369
370 // ------------------------------------------------------------------
371 // ciInstanceKlass::unique_concrete_subklass
372 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
373 if (!is_loaded()) return nullptr; // No change if class is not loaded
374 if (!is_abstract()) return nullptr; // Only applies to abstract classes.
375 if (!has_subklass()) return nullptr; // Must have at least one subklass.
376 VM_ENTRY_MARK;
377 InstanceKlass* ik = get_instanceKlass();
378 Klass* up = ik->up_cast_abstract();
379 assert(up->is_instance_klass(), "must be InstanceKlass");
380 if (ik == up) {
381 return nullptr;
382 }
383 return CURRENT_THREAD_ENV->get_instance_klass(up);
384 }
385
386 // ------------------------------------------------------------------
387 // ciInstanceKlass::has_finalizable_subclass
388 bool ciInstanceKlass::has_finalizable_subclass() {
389 if (!is_loaded()) return true;
390 VM_ENTRY_MARK;
391 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != nullptr;
392 }
393
394 bool ciInstanceKlass::contains_field_offset(int offset) const {
395 VM_ENTRY_MARK;
396 return get_instanceKlass()->contains_field_offset(offset);
397 }
398
399 ciField* ciInstanceKlass::get_nonstatic_field_by_offset(const int field_offset) {
400 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
401 ciField* field = nonstatic_field_at(i);
402 int field_off = field->offset_in_bytes();
403 if (field_off == field_offset) {
404 return field;
405 }
406 }
407 return nullptr;
408 }
409
410 // ------------------------------------------------------------------
411 // ciInstanceKlass::get_field_by_offset
412 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
413 if (!is_static) {
414 return get_nonstatic_field_by_offset(field_offset);
415 }
416
417 VM_ENTRY_MARK;
418 InstanceKlass* k = get_instanceKlass();
419 fieldDescriptor fd;
420 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
421 return nullptr;
422 }
423 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
424 return field;
425 }
426
427 ciField* ciInstanceKlass::get_non_flat_field_by_offset(int field_offset) {
428 for (int i = 0, len = nof_declared_nonstatic_fields(); i < len; i++) {
429 ciField* field = declared_nonstatic_field_at(i);
430 int field_off = field->offset_in_bytes();
431 if (field_off == field_offset) {
432 return field;
433 }
434 }
435 return nullptr;
436 }
437
438 int ciInstanceKlass::field_index_by_offset(int offset) {
439 int best_offset = 0;
440 int best_index = -1;
441 // Search the field with the given offset
442 for (int i = 0; i < nof_declared_nonstatic_fields(); ++i) {
443 int field_offset = declared_nonstatic_field_at(i)->offset_in_bytes();
444 if (field_offset == offset) {
445 // Exact match
446 return i;
447 } else if (field_offset < offset && field_offset > best_offset) {
448 // No exact match. Save the index of the field with the closest offset that
449 // is smaller than the given field offset. This index corresponds to the
450 // flat field that holds the field we are looking for.
451 best_offset = field_offset;
452 best_index = i;
453 }
454 }
455 assert(best_index >= 0, "field not found");
456 assert(best_offset == offset || declared_nonstatic_field_at(best_index)->type()->is_inlinetype(), "offset should match for non-inline types");
457 return best_index;
458 }
459
460 // ------------------------------------------------------------------
461 // ciInstanceKlass::get_field_by_name
462 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
463 VM_ENTRY_MARK;
464 InstanceKlass* k = get_instanceKlass();
465 fieldDescriptor fd;
466 Klass* def = k->find_field(name->get_symbol(), signature->get_symbol(), is_static, &fd);
467 if (def == nullptr) {
468 return nullptr;
469 }
470 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
471 return field;
472 }
473
474 const GrowableArray<ciField*> empty_field_array(0, MemTag::mtCompiler);
475
476 // This is essentially a shortcut for:
477 // get_field_by_offset(field_offset, is_static)->layout_type()
478 // except this does not require allocating memory for a new ciField
479 BasicType ciInstanceKlass::get_field_type_by_offset(const int field_offset, const bool is_static) {
480 if (!is_static) {
481 ciField* field = get_nonstatic_field_by_offset(field_offset);
482 return field != nullptr ? field->layout_type() : T_ILLEGAL;
483 }
484
485 // Avoid allocating a new ciField by obtaining the field type directly
486 VM_ENTRY_MARK;
487 InstanceKlass* k = get_instanceKlass();
488 fieldDescriptor fd;
489 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
490 return T_ILLEGAL;
491 }
492
493 // Reproduce the behavior of ciField::layout_type
494 BasicType field_type = fd.field_type();
495 if (is_reference_type(field_type)) {
496 return T_OBJECT;
497 }
498 return type2field[make(field_type)->basic_type()];
499 }
500
501 void ciInstanceKlass::compute_nonstatic_fields() {
502 assert(is_loaded(), "must be loaded");
503
504 if (_nonstatic_fields != nullptr) {
505 assert(_declared_nonstatic_fields != nullptr, "must be initialized at the same time, class %s", name()->as_utf8());
506 return;
507 }
508
509 if (!has_nonstatic_fields()) {
510 _declared_nonstatic_fields = &empty_field_array;
511 _nonstatic_fields = &empty_field_array;
512 return;
513 }
514 assert(!is_java_lang_Object(), "bootstrap OK");
515
516 ciInstanceKlass* super = this->super();
517 assert(super != nullptr, "must have a super class, current class: %s", name()->as_utf8());
518 super->compute_nonstatic_fields();
519 const GrowableArray<ciField*>* super_declared_fields = super->_declared_nonstatic_fields;;
520 const GrowableArray<ciField*>* super_fields = super->_nonstatic_fields;
521 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());
522
523 GUARDED_VM_ENTRY({
524 compute_nonstatic_fields_impl(super_declared_fields, super_fields);
525 });
526 }
527
528 void ciInstanceKlass::compute_nonstatic_fields_impl(const GrowableArray<ciField*>* super_declared_fields, const GrowableArray<ciField*>* super_fields) {
529 assert(_declared_nonstatic_fields == nullptr && _nonstatic_fields == nullptr, "initialized already");
530 ASSERT_IN_VM;
531 Arena* arena = CURRENT_ENV->arena();
532
533 InstanceKlass* this_klass = get_instanceKlass();
534 int declared_field_num = 0;
535 int field_num = 0;
536 for (JavaFieldStream fs(this_klass); !fs.done(); fs.next()) {
537 if (fs.access_flags().is_static()) {
538 continue;
539 }
540
541 declared_field_num++;
542
543 fieldDescriptor& fd = fs.field_descriptor();
544 if (fd.is_flat()) {
545 InlineKlass* k = this_klass->get_inline_type_field_klass(fd.index());
546 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass();
547 field_num += vk->nof_nonstatic_fields();
548 field_num += fd.has_null_marker() ? 1 : 0;
549 } else {
550 field_num++;
551 }
552 }
553
554 GrowableArray<ciField*>* tmp_declared_fields = nullptr;
555 if (declared_field_num != 0) {
556 tmp_declared_fields = new (arena) GrowableArray<ciField*>(arena, declared_field_num + super_declared_fields->length(), 0, nullptr);
557 tmp_declared_fields->appendAll(super_declared_fields);
558 }
559
560 GrowableArray<ciField*>* tmp_fields = nullptr;
561 if (field_num != 0) {
562 tmp_fields = new (arena) GrowableArray<ciField*>(arena, field_num + super_fields->length(), 0, nullptr);
563 tmp_fields->appendAll(super_fields);
564 }
565
566 // For later assertion
567 declared_field_num += super_declared_fields->length();
568 field_num += super_fields->length();
569
570 for (JavaFieldStream fs(this_klass); !fs.done(); fs.next()) {
571 if (fs.access_flags().is_static()) {
572 continue;
573 }
574
575 fieldDescriptor& fd = fs.field_descriptor();
576 ciField* declared_field = new (arena) ciField(&fd);
577 assert(tmp_declared_fields != nullptr, "should be initialized");
578 tmp_declared_fields->append(declared_field);
579
580 if (fd.is_flat()) {
581 // Flat fields are embedded
582 Klass* k = get_instanceKlass()->get_inline_type_field_klass(fd.index());
583 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass();
584 // Iterate over fields of the flat inline type and copy them to 'this'
585 for (int i = 0; i < vk->nof_nonstatic_fields(); ++i) {
586 assert(tmp_fields != nullptr, "should be initialized");
587 tmp_fields->append(new (arena) ciField(declared_field, vk->nonstatic_field_at(i)));
588 }
589 if (fd.has_null_marker()) {
590 assert(tmp_fields != nullptr, "should be initialized");
591 tmp_fields->append(new (arena) ciField(declared_field));
592 }
593 } else {
594 assert(tmp_fields != nullptr, "should be initialized");
595 tmp_fields->append(declared_field);
596 }
597 }
598
599 // Now sort them by offset, ascending. In principle, they could mix with superclass fields.
600 if (tmp_declared_fields != nullptr) {
601 assert(tmp_declared_fields->length() == declared_field_num, "sanity check failed for class: %s, number of declared fields: %d, expected: %d",
602 name()->as_utf8(), tmp_declared_fields->length(), declared_field_num);
603 _declared_nonstatic_fields = tmp_declared_fields;
604 } else {
605 _declared_nonstatic_fields = super_declared_fields;
606 }
607
608 if (tmp_fields != nullptr) {
609 assert(tmp_fields->length() == field_num, "sanity check failed for class: %s, number of fields: %d, expected: %d",
610 name()->as_utf8(), tmp_fields->length(), field_num);
611 _nonstatic_fields = tmp_fields;
612 } else {
613 _nonstatic_fields = super_fields;
614 }
615 }
616
617 bool ciInstanceKlass::compute_injected_fields_helper() {
618 ASSERT_IN_VM;
619 InstanceKlass* k = get_instanceKlass();
620
621 for (InternalFieldStream fs(k); !fs.done(); fs.next()) {
622 if (fs.access_flags().is_static()) continue;
623 return true;
624 }
625 return false;
626 }
627
628 void ciInstanceKlass::compute_injected_fields() {
629 assert(is_loaded(), "must be loaded");
630
631 int has_injected_fields = 0;
632 if (super() != nullptr && super()->has_injected_fields()) {
633 has_injected_fields = 1;
634 } else {
635 GUARDED_VM_ENTRY({
636 has_injected_fields = compute_injected_fields_helper() ? 1 : 0;
637 });
638 }
639 // may be concurrently initialized for shared ciInstanceKlass objects
640 assert(_has_injected_fields == -1 || _has_injected_fields == has_injected_fields, "broken concurrent initialization");
641 _has_injected_fields = has_injected_fields;
642 }
643
644 bool ciInstanceKlass::has_object_fields() const {
645 GUARDED_VM_ENTRY(
646 return get_instanceKlass()->nonstatic_oop_map_size() > 0;
647 );
648 }
649
650 bool ciInstanceKlass::compute_has_trusted_loader() {
651 ASSERT_IN_VM;
652 oop loader_oop = loader();
653 if (loader_oop == nullptr) {
654 return true; // bootstrap class loader
655 }
656 return java_lang_ClassLoader::is_trusted_loader(loader_oop);
657 }
658
659 bool ciInstanceKlass::has_class_initializer() {
660 VM_ENTRY_MARK;
661 return get_instanceKlass()->class_initializer() != nullptr;
662 }
663
664 // ------------------------------------------------------------------
665 // ciInstanceKlass::find_method
666 //
667 // Find a method in this klass.
668 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
669 VM_ENTRY_MARK;
670 InstanceKlass* k = get_instanceKlass();
671 Symbol* name_sym = name->get_symbol();
672 Symbol* sig_sym= signature->get_symbol();
673
674 Method* m = k->find_method(name_sym, sig_sym);
675 if (m == nullptr) return nullptr;
676
677 return CURRENT_THREAD_ENV->get_method(m);
678 }
679
680 // ------------------------------------------------------------------
681 // ciInstanceKlass::is_leaf_type
682 bool ciInstanceKlass::is_leaf_type() {
683 assert(is_loaded(), "must be loaded");
684 if (is_shared()) {
685 return is_final(); // approximately correct
686 } else {
687 return !has_subklass() && (!is_interface() || nof_implementors() == 0);
688 }
689 }
690
691 // ------------------------------------------------------------------
692 // ciInstanceKlass::implementor
693 //
694 // Report an implementor of this interface.
695 // Note that there are various races here, since my copy
696 // of _nof_implementors might be out of date with respect
697 // to results returned by InstanceKlass::implementor.
698 // This is OK, since any dependencies we decide to assert
699 // will be checked later under the Compile_lock.
700 ciInstanceKlass* ciInstanceKlass::implementor() {
701 assert(is_interface(), "required");
702 ciInstanceKlass* impl = _implementor;
703 if (impl == nullptr) {
704 if (is_shared()) {
705 impl = this; // assume a well-known interface never has a unique implementor
706 } else {
707 // Go into the VM to fetch the implementor.
708 VM_ENTRY_MARK;
709 InstanceKlass* ik = get_instanceKlass();
710 Klass* implk = ik->implementor();
711 if (implk != nullptr) {
712 if (implk == ik) {
713 // More than one implementors. Use 'this' in this case.
714 impl = this;
715 } else {
716 impl = CURRENT_THREAD_ENV->get_instance_klass(implk);
717 }
718 }
719 }
720 // Memoize this result.
721 _implementor = impl;
722 }
723 return impl;
724 }
725
726 bool ciInstanceKlass::can_be_inline_klass(bool is_exact) {
727 if (!Arguments::is_valhalla_enabled()) {
728 return false;
729 }
730 if (!is_loaded() || is_inlinetype()) {
731 // Not loaded or known to be an inline klass
732 return true;
733 }
734 if (!is_exact) {
735 // Not exact, check if this is a valid super for an inline klass
736 GUARDED_VM_ENTRY(
737 return !get_instanceKlass()->access_flags().is_identity_class() || is_java_lang_Object();
738 )
739 }
740 return false;
741 }
742
743 // Utility class for printing of the contents of the static fields for
744 // use by compilation replay. It only prints out the information that
745 // could be consumed by the compiler, so for primitive types it prints
746 // out the actual value. For Strings it's the actual string value.
747 // For array types it it's first level array size since that's the
748 // only value which statically unchangeable. For all other reference
749 // types it simply prints out the dynamic type.
750
751 class StaticFieldPrinter : public FieldClosure {
752 protected:
753 outputStream* _out;
754 public:
755 StaticFieldPrinter(outputStream* out) :
756 _out(out) {
757 }
758 void do_field_helper(fieldDescriptor* fd, oop obj, bool is_flat);
759 };
760
761 class StaticFinalFieldPrinter : public StaticFieldPrinter {
762 const char* _holder;
763 public:
764 StaticFinalFieldPrinter(outputStream* out, const char* holder) :
765 StaticFieldPrinter(out), _holder(holder) {
766 }
767 void do_field(fieldDescriptor* fd) {
768 if (fd->is_final() && !fd->has_initial_value()) {
769 ResourceMark rm;
770 InstanceKlass* holder = fd->field_holder();
771 oop mirror = holder->java_mirror();
772 _out->print("staticfield %s %s ", _holder, fd->name()->as_quoted_ascii());
773 BasicType bt = fd->field_type();
774 if (bt != T_OBJECT && bt != T_ARRAY) {
775 _out->print("%s ", fd->signature()->as_quoted_ascii());
776 }
777 do_field_helper(fd, mirror, false);
778 _out->cr();
779 }
780 }
781 };
782
783 class InlineTypeFieldPrinter : public StaticFieldPrinter {
784 oop _obj;
785 public:
786 InlineTypeFieldPrinter(outputStream* out, oop obj) :
787 StaticFieldPrinter(out), _obj(obj) {
788 }
789 void do_field(fieldDescriptor* fd) {
790 do_field_helper(fd, _obj, true);
791 _out->print(" ");
792 }
793 };
794
795 void StaticFieldPrinter::do_field_helper(fieldDescriptor* fd, oop mirror, bool is_flat) {
796 BasicType field_type = fd->field_type();
797 switch (field_type) {
798 case T_BYTE: _out->print("%d", mirror->byte_field(fd->offset())); break;
799 case T_BOOLEAN: _out->print("%d", mirror->bool_field(fd->offset())); break;
800 case T_SHORT: _out->print("%d", mirror->short_field(fd->offset())); break;
801 case T_CHAR: _out->print("%d", mirror->char_field(fd->offset())); break;
802 case T_INT: _out->print("%d", mirror->int_field(fd->offset())); break;
803 case T_LONG: _out->print(INT64_FORMAT, (int64_t)(mirror->long_field(fd->offset()))); break;
804 case T_FLOAT: {
805 float f = mirror->float_field(fd->offset());
806 _out->print("%d", *(int*)&f);
807 break;
808 }
809 case T_DOUBLE: {
810 double d = mirror->double_field(fd->offset());
811 _out->print(INT64_FORMAT, *(int64_t*)&d);
812 break;
813 }
814 case T_ARRAY: // fall-through
815 case T_OBJECT:
816 if (!fd->is_null_free_inline_type()) {
817 _out->print("%s ", fd->signature()->as_quoted_ascii());
818 oop value = mirror->obj_field_acquire(fd->offset());
819 if (value == nullptr) {
820 if (field_type == T_ARRAY) {
821 _out->print("%d", -1);
822 }
823 _out->cr();
824 } else if (value->is_instance()) {
825 assert(field_type == T_OBJECT, "");
826 if (value->is_a(vmClasses::String_klass())) {
827 const char* ascii_value = java_lang_String::as_quoted_ascii(value);
828 _out->print("\"%s\"", (ascii_value != nullptr) ? ascii_value : "");
829 } else {
830 const char* klass_name = value->klass()->name()->as_quoted_ascii();
831 _out->print("%s", klass_name);
832 }
833 } else if (value->is_array()) {
834 arrayOop a = (arrayOop)value;
835 _out->print("%d", a->length());
836 if (value->is_objArray()) {
837 objArrayOop oa = (objArrayOop)value;
838 const char* klass_name = value->klass()->name()->as_quoted_ascii();
839 _out->print(" %s", klass_name);
840 }
841 } else {
842 ShouldNotReachHere();
843 }
844 break;
845 } else {
846 // handling of null free inline type
847 ResetNoHandleMark rnhm;
848 Thread* THREAD = Thread::current();
849 SignatureStream ss(fd->signature(), false);
850 Symbol* name = ss.as_symbol();
851 assert(!HAS_PENDING_EXCEPTION, "can resolve klass?");
852 InstanceKlass* holder = fd->field_holder();
853 InstanceKlass* k = SystemDictionary::find_instance_klass(THREAD, name,
854 Handle(THREAD, holder->class_loader()));
855 guarantee(k != nullptr && !HAS_PENDING_EXCEPTION, "can resolve klass?");
856 InlineKlass* vk = InlineKlass::cast(k);
857 oop obj;
858 if (is_flat) {
859 int field_offset = fd->offset() - vk->payload_offset();
860 obj = cast_to_oop(cast_from_oop<address>(mirror) + field_offset);
861 } else {
862 obj = mirror->obj_field_acquire(fd->offset());
863 }
864 InlineTypeFieldPrinter print_field(_out, obj);
865 vk->do_nonstatic_fields(&print_field);
866 break;
867 }
868 default:
869 ShouldNotReachHere();
870 }
871 }
872
873 const char *ciInstanceKlass::replay_name() const {
874 return CURRENT_ENV->replay_name(get_instanceKlass());
875 }
876
877 void ciInstanceKlass::dump_replay_instanceKlass(outputStream* out, InstanceKlass* ik) {
878 if (ik->is_hidden()) {
879 const char *name = CURRENT_ENV->dyno_name(ik);
880 if (name != nullptr) {
881 out->print_cr("instanceKlass %s # %s", name, ik->name()->as_quoted_ascii());
882 } else {
883 out->print_cr("# instanceKlass %s", ik->name()->as_quoted_ascii());
884 }
885 } else {
886 out->print_cr("instanceKlass %s", ik->name()->as_quoted_ascii());
887 }
888 }
889
890 GrowableArray<ciInstanceKlass*>* ciInstanceKlass::transitive_interfaces() const{
891 if (_transitive_interfaces == nullptr) {
892 const_cast<ciInstanceKlass*>(this)->compute_transitive_interfaces();
893 }
894 return _transitive_interfaces;
895 }
896
897 void ciInstanceKlass::compute_transitive_interfaces() {
898 GUARDED_VM_ENTRY(
899 InstanceKlass* ik = get_instanceKlass();
900 Array<InstanceKlass*>* interfaces = ik->transitive_interfaces();
901 int orig_length = interfaces->length();
902 Arena* arena = CURRENT_ENV->arena();
903 int transitive_interfaces_len = orig_length + (is_interface() ? 1 : 0);
904 GrowableArray<ciInstanceKlass*>* transitive_interfaces = new(arena)GrowableArray<ciInstanceKlass*>(arena, transitive_interfaces_len,
905 0, nullptr);
906 for (int i = 0; i < orig_length; i++) {
907 transitive_interfaces->append(CURRENT_ENV->get_instance_klass(interfaces->at(i)));
908 }
909 if (is_interface()) {
910 transitive_interfaces->append(this);
911 }
912 _transitive_interfaces = transitive_interfaces;
913 );
914 }
915
916 void ciInstanceKlass::dump_replay_data(outputStream* out) {
917 ResourceMark rm;
918
919 InstanceKlass* ik = get_instanceKlass();
920 ConstantPool* cp = ik->constants();
921
922 // Try to record related loaded classes
923 Klass* sub = ik->subklass();
924 while (sub != nullptr) {
925 if (sub->is_instance_klass()) {
926 InstanceKlass *isub = InstanceKlass::cast(sub);
927 dump_replay_instanceKlass(out, isub);
928 }
929 sub = sub->next_sibling();
930 }
931
932 // Dump out the state of the constant pool tags. During replay the
933 // tags will be validated for things which shouldn't change and
934 // classes will be resolved if the tags indicate that they were
935 // resolved at compile time.
936 const char *name = replay_name();
937 out->print("ciInstanceKlass %s %d %d %d", name,
938 is_linked(), is_initialized(), cp->length());
939 for (int index = 1; index < cp->length(); index++) {
940 out->print(" %d", cp->tags()->at(index));
941 }
942 out->cr();
943 if (is_initialized()) {
944 // Dump out the static final fields in case the compilation relies
945 // on their value for correct replay.
946 StaticFinalFieldPrinter sffp(out, name);
947 ik->do_local_static_fields(&sffp);
948 }
949 }
950
951 #ifdef ASSERT
952 bool ciInstanceKlass::debug_final_field_at(int offset) {
953 GUARDED_VM_ENTRY(
954 InstanceKlass* ik = get_instanceKlass();
955 fieldDescriptor fd;
956 if (ik->find_field_from_offset(offset, false, &fd)) {
957 return fd.is_final();
958 }
959 );
960 return false;
961 }
962
963 bool ciInstanceKlass::debug_stable_field_at(int offset) {
964 GUARDED_VM_ENTRY(
965 InstanceKlass* ik = get_instanceKlass();
966 fieldDescriptor fd;
967 if (ik->find_field_from_offset(offset, false, &fd)) {
968 return fd.is_stable();
969 }
970 );
971 return false;
972 }
973 #endif