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 InstanceKlass::ClassState ciInstanceKlass::compute_init_state() {
146 if (_is_shared && is_loaded()) {
147 // Return cached init state of shared klass
148 ciEnv* env = CURRENT_ENV;
149 assert(env->task() != nullptr, "only calls from compilation are expected here");
150 return env->get_cached_init_state(ident());
151 }
152 return _init_state;
153 }
154
155 // ------------------------------------------------------------------
156 // ciInstanceKlass::compute_shared_has_subklass
157 bool ciInstanceKlass::compute_shared_has_subklass() {
158 GUARDED_VM_ENTRY(
159 InstanceKlass* ik = get_instanceKlass();
160 _has_subklass = ik->subklass() != nullptr ? subklass_true : subklass_false;
161 return _has_subklass == subklass_true;
162 )
163 }
164
165 // ------------------------------------------------------------------
166 // ciInstanceKlass::loader
167 oop ciInstanceKlass::loader() {
168 ASSERT_IN_VM;
169 return JNIHandles::resolve(_loader);
170 }
171
172 // ------------------------------------------------------------------
173 // ciInstanceKlass::loader_handle
174 jobject ciInstanceKlass::loader_handle() {
175 return _loader;
176 }
177
178 // ------------------------------------------------------------------
179 // ciInstanceKlass::field_cache
180 //
181 // Get the field cache associated with this klass.
182 ciConstantPoolCache* ciInstanceKlass::field_cache() {
183 if (is_shared()) {
184 return nullptr;
185 }
186 if (_field_cache == nullptr) {
187 assert(!is_java_lang_Object(), "Object has no fields");
188 Arena* arena = CURRENT_ENV->arena();
189 _field_cache = new (arena) ciConstantPoolCache(arena, 5);
190 }
191 return _field_cache;
192 }
193
194 // ------------------------------------------------------------------
195 // ciInstanceKlass::get_canonical_holder
196 //
197 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
198 #ifdef ASSERT
199 if (!(offset >= 0 && offset < layout_helper_size_in_bytes())) {
200 tty->print("*** get_canonical_holder(%d) on ", offset);
201 this->print();
202 tty->print_cr(" ***");
203 };
204 assert(offset >= 0 && offset < layout_helper_size_in_bytes(), "offset must be tame");
205 #endif
206
207 if (offset < instanceOopDesc::base_offset_in_bytes()) {
208 // All header offsets belong properly to java/lang/Object.
209 return CURRENT_ENV->Object_klass();
210 }
211
212 ciInstanceKlass* self = this;
213 assert(self->is_loaded(), "must be loaded to access field info");
214 ciField* field = self->get_field_by_offset(offset, false);
215 if (field != nullptr) {
216 return field->holder();
217 } else {
218 for (;;) {
219 assert(self->is_loaded(), "must be loaded to have size");
220 ciInstanceKlass* super = self->super();
221 if (super == nullptr ||
222 super->nof_nonstatic_fields() == 0 ||
223 super->layout_helper_size_in_bytes() <= offset) {
224 return self;
225 } else {
226 self = super; // return super->get_canonical_holder(offset)
227 }
228 }
229 }
230 }
231
232 // ------------------------------------------------------------------
233 // ciInstanceKlass::is_java_lang_Object
234 //
235 // Is this klass java.lang.Object?
236 bool ciInstanceKlass::is_java_lang_Object() const {
237 return equals(CURRENT_ENV->Object_klass());
238 }
239
240 // ------------------------------------------------------------------
241 // ciInstanceKlass::uses_default_loader
242 bool ciInstanceKlass::uses_default_loader() const {
243 // Note: We do not need to resolve the handle or enter the VM
244 // in order to test null-ness.
245 return _loader == nullptr;
246 }
247
248 // ------------------------------------------------------------------
249
250 /**
251 * Return basic type of boxed value for box klass or T_OBJECT if not.
252 */
253 BasicType ciInstanceKlass::box_klass_type() const {
254 if (uses_default_loader() && is_loaded()) {
255 return vmClasses::box_klass_type(get_Klass());
256 } else {
257 return T_OBJECT;
258 }
259 }
260
261 /**
262 * Is this boxing klass?
263 */
264 bool ciInstanceKlass::is_box_klass() const {
265 return is_java_primitive(box_klass_type());
266 }
267
268 /**
269 * Is this boxed value offset?
270 */
271 bool ciInstanceKlass::is_boxed_value_offset(int offset) const {
272 BasicType bt = box_klass_type();
273 return is_java_primitive(bt) &&
274 (offset == java_lang_boxing_object::value_offset(bt));
275 }
276
277 // ------------------------------------------------------------------
278 // ciInstanceKlass::is_in_package
279 //
280 // Is this klass in the given package?
281 bool ciInstanceKlass::is_in_package(const char* packagename, int len) {
282 // To avoid class loader mischief, this test always rejects application classes.
283 if (!uses_default_loader())
284 return false;
285 GUARDED_VM_ENTRY(
286 return is_in_package_impl(packagename, len);
287 )
288 }
289
290 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) {
291 ASSERT_IN_VM;
292
293 // If packagename contains trailing '/' exclude it from the
294 // prefix-test since we test for it explicitly.
295 if (packagename[len - 1] == '/')
296 len--;
297
298 if (!name()->starts_with(packagename, len))
299 return false;
300
301 // Test if the class name is something like "java/lang".
302 if ((len + 1) > name()->utf8_length())
303 return false;
304
305 // Test for trailing '/'
306 if (name()->char_at(len) != '/')
307 return false;
308
309 // Make sure it's not actually in a subpackage:
310 if (name()->index_of_at(len+1, "/", 1) >= 0)
311 return false;
312
313 return true;
314 }
315
316 // ------------------------------------------------------------------
317 // ciInstanceKlass::print_impl
318 //
319 // Implementation of the print method.
320 void ciInstanceKlass::print_impl(outputStream* st) {
321 ciKlass::print_impl(st);
322 GUARDED_VM_ENTRY(st->print(" loader=" INTPTR_FORMAT, p2i(loader()));)
323 if (is_loaded()) {
324 st->print(" initialized=%s finalized=%s subklass=%s size=%d flags=",
325 bool_to_str(is_initialized()),
326 bool_to_str(has_finalizer()),
327 bool_to_str(has_subklass()),
328 layout_helper());
329
330 _flags.print_klass_flags(st);
331
332 if (_super) {
333 st->print(" super=");
334 _super->print_name_on(st);
335 }
336 if (_java_mirror) {
337 st->print(" mirror=PRESENT");
338 }
339 }
340 }
341
342 // ------------------------------------------------------------------
343 // ciInstanceKlass::super
344 //
345 // Get the superklass of this klass.
346 ciInstanceKlass* ciInstanceKlass::super() {
347 assert(is_loaded(), "must be loaded");
348 if (_super == nullptr && !is_java_lang_Object()) {
349 GUARDED_VM_ENTRY(
350 Klass* super_klass = get_instanceKlass()->super();
351 _super = CURRENT_ENV->get_instance_klass(super_klass);
352 )
353 }
354 return _super;
355 }
356
357 // ------------------------------------------------------------------
358 // ciInstanceKlass::java_mirror
359 //
360 // Get the instance of java.lang.Class corresponding to this klass.
361 // Cache it on this->_java_mirror.
362 ciInstance* ciInstanceKlass::java_mirror() {
363 if (is_shared()) {
364 return ciKlass::java_mirror();
365 }
366 if (_java_mirror == nullptr) {
367 _java_mirror = ciKlass::java_mirror();
368 }
369 return _java_mirror;
370 }
371
372 // ------------------------------------------------------------------
373 // ciInstanceKlass::unique_concrete_subklass
374 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
375 if (!is_loaded()) return nullptr; // No change if class is not loaded
376 if (!is_abstract()) return nullptr; // Only applies to abstract classes.
377 if (!has_subklass()) return nullptr; // Must have at least one subklass.
378 VM_ENTRY_MARK;
379 InstanceKlass* ik = get_instanceKlass();
380 Klass* up = ik->up_cast_abstract();
381 assert(up->is_instance_klass(), "must be InstanceKlass");
382 if (ik == up) {
383 return nullptr;
384 }
385 return CURRENT_THREAD_ENV->get_instance_klass(up);
386 }
387
388 // ------------------------------------------------------------------
389 // ciInstanceKlass::has_finalizable_subclass
390 bool ciInstanceKlass::has_finalizable_subclass() {
391 if (!is_loaded()) return true;
392 VM_ENTRY_MARK;
393 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != nullptr;
394 }
395
396 bool ciInstanceKlass::contains_field_offset(int offset) const {
397 VM_ENTRY_MARK;
398 return get_instanceKlass()->contains_field_offset(offset);
399 }
400
401 ciField* ciInstanceKlass::get_nonstatic_field_by_offset(const int field_offset) {
402 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
403 ciField* field = nonstatic_field_at(i);
404 int field_off = field->offset_in_bytes();
405 if (field_off == field_offset) {
406 return field;
407 }
408 }
409 return nullptr;
410 }
411
412 // ------------------------------------------------------------------
413 // ciInstanceKlass::get_field_by_offset
414 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
415 if (!is_static) {
416 return get_nonstatic_field_by_offset(field_offset);
417 }
418
419 VM_ENTRY_MARK;
420 InstanceKlass* k = get_instanceKlass();
421 fieldDescriptor fd;
422 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
423 return nullptr;
424 }
425 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
426 return field;
427 }
428
429 ciField* ciInstanceKlass::get_non_flat_field_by_offset(int field_offset) {
430 for (int i = 0, len = nof_declared_nonstatic_fields(); i < len; i++) {
431 ciField* field = declared_nonstatic_field_at(i);
432 int field_off = field->offset_in_bytes();
433 if (field_off == field_offset) {
434 return field;
435 }
436 }
437 return nullptr;
438 }
439
440 int ciInstanceKlass::field_index_by_offset(int offset) {
441 int best_offset = 0;
442 int best_index = -1;
443 // Search the field with the given offset
444 for (int i = 0; i < nof_declared_nonstatic_fields(); ++i) {
445 int field_offset = declared_nonstatic_field_at(i)->offset_in_bytes();
446 if (field_offset == offset) {
447 // Exact match
448 return i;
449 } else if (field_offset < offset && field_offset > best_offset) {
450 // No exact match. Save the index of the field with the closest offset that
451 // is smaller than the given field offset. This index corresponds to the
452 // flat field that holds the field we are looking for.
453 best_offset = field_offset;
454 best_index = i;
455 }
456 }
457 assert(best_index >= 0, "field not found");
458 assert(best_offset == offset || declared_nonstatic_field_at(best_index)->type()->is_inlinetype(), "offset should match for non-inline types");
459 return best_index;
460 }
461
462 // ------------------------------------------------------------------
463 // ciInstanceKlass::get_field_by_name
464 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
465 VM_ENTRY_MARK;
466 InstanceKlass* k = get_instanceKlass();
467 fieldDescriptor fd;
468 Klass* def = k->find_field(name->get_symbol(), signature->get_symbol(), is_static, &fd);
469 if (def == nullptr) {
470 return nullptr;
471 }
472 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
473 return field;
474 }
475
476 const GrowableArray<ciField*> empty_field_array(0, MemTag::mtCompiler);
477
478 // This is essentially a shortcut for:
479 // get_field_by_offset(field_offset, is_static)->layout_type()
480 // except this does not require allocating memory for a new ciField
481 BasicType ciInstanceKlass::get_field_type_by_offset(const int field_offset, const bool is_static) {
482 if (!is_static) {
483 ciField* field = get_nonstatic_field_by_offset(field_offset);
484 return field != nullptr ? field->layout_type() : T_ILLEGAL;
485 }
486
487 // Avoid allocating a new ciField by obtaining the field type directly
488 VM_ENTRY_MARK;
489 InstanceKlass* k = get_instanceKlass();
490 fieldDescriptor fd;
491 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
492 return T_ILLEGAL;
493 }
494
495 // Reproduce the behavior of ciField::layout_type
496 BasicType field_type = fd.field_type();
497 if (is_reference_type(field_type)) {
498 return T_OBJECT;
499 }
500 return type2field[make(field_type)->basic_type()];
501 }
502
503 void ciInstanceKlass::compute_nonstatic_fields() {
504 assert(is_loaded(), "must be loaded");
505
506 if (_nonstatic_fields != nullptr) {
507 assert(_declared_nonstatic_fields != nullptr, "must be initialized at the same time, class %s", name()->as_utf8());
508 return;
509 }
510
511 if (!has_nonstatic_fields()) {
512 _declared_nonstatic_fields = &empty_field_array;
513 _nonstatic_fields = &empty_field_array;
514 return;
515 }
516 assert(!is_java_lang_Object(), "bootstrap OK");
517
518 ciInstanceKlass* super = this->super();
519 assert(super != nullptr, "must have a super class, current class: %s", name()->as_utf8());
520 super->compute_nonstatic_fields();
521 const GrowableArray<ciField*>* super_declared_fields = super->_declared_nonstatic_fields;;
522 const GrowableArray<ciField*>* super_fields = super->_nonstatic_fields;
523 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());
524
525 GUARDED_VM_ENTRY({
526 compute_nonstatic_fields_impl(super_declared_fields, super_fields);
527 });
528 }
529
530 void ciInstanceKlass::compute_nonstatic_fields_impl(const GrowableArray<ciField*>* super_declared_fields, const GrowableArray<ciField*>* super_fields) {
531 assert(_declared_nonstatic_fields == nullptr && _nonstatic_fields == nullptr, "initialized already");
532 ASSERT_IN_VM;
533 Arena* arena = CURRENT_ENV->arena();
534
535 InstanceKlass* this_klass = get_instanceKlass();
536 int declared_field_num = 0;
537 int field_num = 0;
538 for (JavaFieldStream fs(this_klass); !fs.done(); fs.next()) {
539 if (fs.access_flags().is_static()) {
540 continue;
541 }
542
543 declared_field_num++;
544
545 fieldDescriptor& fd = fs.field_descriptor();
546 if (fd.is_flat()) {
547 InlineKlass* k = this_klass->get_inline_type_field_klass(fd.index());
548 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass();
549 field_num += vk->nof_nonstatic_fields();
550 field_num += fd.has_null_marker() ? 1 : 0;
551 } else {
552 field_num++;
553 }
554 }
555
556 GrowableArray<ciField*>* tmp_declared_fields = nullptr;
557 if (declared_field_num != 0) {
558 tmp_declared_fields = new (arena) GrowableArray<ciField*>(arena, declared_field_num + super_declared_fields->length(), 0, nullptr);
559 tmp_declared_fields->appendAll(super_declared_fields);
560 }
561
562 GrowableArray<ciField*>* tmp_fields = nullptr;
563 if (field_num != 0) {
564 tmp_fields = new (arena) GrowableArray<ciField*>(arena, field_num + super_fields->length(), 0, nullptr);
565 tmp_fields->appendAll(super_fields);
566 }
567
568 // For later assertion
569 declared_field_num += super_declared_fields->length();
570 field_num += super_fields->length();
571
572 for (JavaFieldStream fs(this_klass); !fs.done(); fs.next()) {
573 if (fs.access_flags().is_static()) {
574 continue;
575 }
576
577 fieldDescriptor& fd = fs.field_descriptor();
578 ciField* declared_field = new (arena) ciField(&fd);
579 assert(tmp_declared_fields != nullptr, "should be initialized");
580 tmp_declared_fields->append(declared_field);
581
582 if (fd.is_flat()) {
583 // Flat fields are embedded
584 Klass* k = get_instanceKlass()->get_inline_type_field_klass(fd.index());
585 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass();
586 // Iterate over fields of the flat inline type and copy them to 'this'
587 for (int i = 0; i < vk->nof_nonstatic_fields(); ++i) {
588 assert(tmp_fields != nullptr, "should be initialized");
589 tmp_fields->append(new (arena) ciField(declared_field, vk->nonstatic_field_at(i)));
590 }
591 if (fd.has_null_marker()) {
592 assert(tmp_fields != nullptr, "should be initialized");
593 tmp_fields->append(new (arena) ciField(declared_field));
594 }
595 } else {
596 assert(tmp_fields != nullptr, "should be initialized");
597 tmp_fields->append(declared_field);
598 }
599 }
600
601 // Now sort them by offset, ascending. In principle, they could mix with superclass fields.
602 if (tmp_declared_fields != nullptr) {
603 assert(tmp_declared_fields->length() == declared_field_num, "sanity check failed for class: %s, number of declared fields: %d, expected: %d",
604 name()->as_utf8(), tmp_declared_fields->length(), declared_field_num);
605 _declared_nonstatic_fields = tmp_declared_fields;
606 } else {
607 _declared_nonstatic_fields = super_declared_fields;
608 }
609
610 if (tmp_fields != nullptr) {
611 assert(tmp_fields->length() == field_num, "sanity check failed for class: %s, number of fields: %d, expected: %d",
612 name()->as_utf8(), tmp_fields->length(), field_num);
613 _nonstatic_fields = tmp_fields;
614 } else {
615 _nonstatic_fields = super_fields;
616 }
617 }
618
619 bool ciInstanceKlass::compute_injected_fields_helper() {
620 ASSERT_IN_VM;
621 InstanceKlass* k = get_instanceKlass();
622
623 for (InternalFieldStream fs(k); !fs.done(); fs.next()) {
624 if (fs.access_flags().is_static()) continue;
625 return true;
626 }
627 return false;
628 }
629
630 void ciInstanceKlass::compute_injected_fields() {
631 assert(is_loaded(), "must be loaded");
632
633 int has_injected_fields = 0;
634 if (super() != nullptr && super()->has_injected_fields()) {
635 has_injected_fields = 1;
636 } else {
637 GUARDED_VM_ENTRY({
638 has_injected_fields = compute_injected_fields_helper() ? 1 : 0;
639 });
640 }
641 // may be concurrently initialized for shared ciInstanceKlass objects
642 assert(_has_injected_fields == -1 || _has_injected_fields == has_injected_fields, "broken concurrent initialization");
643 _has_injected_fields = has_injected_fields;
644 }
645
646 bool ciInstanceKlass::has_object_fields() const {
647 GUARDED_VM_ENTRY(
648 return get_instanceKlass()->nonstatic_oop_map_size() > 0;
649 );
650 }
651
652 bool ciInstanceKlass::compute_has_trusted_loader() {
653 ASSERT_IN_VM;
654 oop loader_oop = loader();
655 if (loader_oop == nullptr) {
656 return true; // bootstrap class loader
657 }
658 return java_lang_ClassLoader::is_trusted_loader(loader_oop);
659 }
660
661 bool ciInstanceKlass::has_class_initializer() {
662 VM_ENTRY_MARK;
663 return get_instanceKlass()->class_initializer() != nullptr;
664 }
665
666 // ------------------------------------------------------------------
667 // ciInstanceKlass::find_method
668 //
669 // Find a method in this klass.
670 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
671 VM_ENTRY_MARK;
672 InstanceKlass* k = get_instanceKlass();
673 Symbol* name_sym = name->get_symbol();
674 Symbol* sig_sym= signature->get_symbol();
675
676 Method* m = k->find_method(name_sym, sig_sym);
677 if (m == nullptr) return nullptr;
678
679 return CURRENT_THREAD_ENV->get_method(m);
680 }
681
682 // ------------------------------------------------------------------
683 // ciInstanceKlass::is_leaf_type
684 bool ciInstanceKlass::is_leaf_type() {
685 assert(is_loaded(), "must be loaded");
686 if (is_shared()) {
687 return is_final(); // approximately correct
688 } else {
689 return !has_subklass() && (!is_interface() || nof_implementors() == 0);
690 }
691 }
692
693 // ------------------------------------------------------------------
694 // ciInstanceKlass::implementor
695 //
696 // Report an implementor of this interface.
697 // Note that there are various races here, since my copy
698 // of _nof_implementors might be out of date with respect
699 // to results returned by InstanceKlass::implementor.
700 // This is OK, since any dependencies we decide to assert
701 // will be checked later under the Compile_lock.
702 ciInstanceKlass* ciInstanceKlass::implementor() {
703 assert(is_interface(), "required");
704 ciInstanceKlass* impl = _implementor;
705 if (impl == nullptr) {
706 if (is_shared()) {
707 impl = this; // assume a well-known interface never has a unique implementor
708 } else {
709 // Go into the VM to fetch the implementor.
710 VM_ENTRY_MARK;
711 InstanceKlass* ik = get_instanceKlass();
712 Klass* implk = ik->implementor();
713 if (implk != nullptr) {
714 if (implk == ik) {
715 // More than one implementors. Use 'this' in this case.
716 impl = this;
717 } else {
718 impl = CURRENT_THREAD_ENV->get_instance_klass(implk);
719 }
720 }
721 }
722 // Memoize this result.
723 _implementor = impl;
724 }
725 return impl;
726 }
727
728 bool ciInstanceKlass::can_be_inline_klass(bool is_exact) {
729 if (!Arguments::is_valhalla_enabled()) {
730 return false;
731 }
732 if (!is_loaded() || is_inlinetype()) {
733 // Not loaded or known to be an inline klass
734 return true;
735 }
736 if (!is_exact) {
737 // Not exact, check if this is a valid super for an inline klass
738 GUARDED_VM_ENTRY(
739 return !get_instanceKlass()->access_flags().is_identity_class() || is_java_lang_Object();
740 )
741 }
742 return false;
743 }
744
745 // Utility class for printing of the contents of the static fields for
746 // use by compilation replay. It only prints out the information that
747 // could be consumed by the compiler, so for primitive types it prints
748 // out the actual value. For Strings it's the actual string value.
749 // For array types it it's first level array size since that's the
750 // only value which statically unchangeable. For all other reference
751 // types it simply prints out the dynamic type.
752
753 class StaticFieldPrinter : public FieldClosure {
754 protected:
755 outputStream* _out;
756 public:
757 StaticFieldPrinter(outputStream* out) :
758 _out(out) {
759 }
760 void do_field_helper(fieldDescriptor* fd, oop obj, bool is_flat);
761 };
762
763 class StaticFinalFieldPrinter : public StaticFieldPrinter {
764 const char* _holder;
765 public:
766 StaticFinalFieldPrinter(outputStream* out, const char* holder) :
767 StaticFieldPrinter(out), _holder(holder) {
768 }
769 void do_field(fieldDescriptor* fd) {
770 if (fd->is_final() && !fd->has_initial_value()) {
771 ResourceMark rm;
772 InstanceKlass* holder = fd->field_holder();
773 oop mirror = holder->java_mirror();
774 _out->print("staticfield %s %s ", _holder, fd->name()->as_quoted_ascii());
775 BasicType bt = fd->field_type();
776 if (bt != T_OBJECT && bt != T_ARRAY) {
777 _out->print("%s ", fd->signature()->as_quoted_ascii());
778 }
779 do_field_helper(fd, mirror, false);
780 _out->cr();
781 }
782 }
783 };
784
785 class InlineTypeFieldPrinter : public StaticFieldPrinter {
786 oop _obj;
787 public:
788 InlineTypeFieldPrinter(outputStream* out, oop obj) :
789 StaticFieldPrinter(out), _obj(obj) {
790 }
791 void do_field(fieldDescriptor* fd) {
792 do_field_helper(fd, _obj, true);
793 _out->print(" ");
794 }
795 };
796
797 void StaticFieldPrinter::do_field_helper(fieldDescriptor* fd, oop mirror, bool is_flat) {
798 BasicType field_type = fd->field_type();
799 switch (field_type) {
800 case T_BYTE: _out->print("%d", mirror->byte_field(fd->offset())); break;
801 case T_BOOLEAN: _out->print("%d", mirror->bool_field(fd->offset())); break;
802 case T_SHORT: _out->print("%d", mirror->short_field(fd->offset())); break;
803 case T_CHAR: _out->print("%d", mirror->char_field(fd->offset())); break;
804 case T_INT: _out->print("%d", mirror->int_field(fd->offset())); break;
805 case T_LONG: _out->print(INT64_FORMAT, (int64_t)(mirror->long_field(fd->offset()))); break;
806 case T_FLOAT: {
807 float f = mirror->float_field(fd->offset());
808 _out->print("%d", *(int*)&f);
809 break;
810 }
811 case T_DOUBLE: {
812 double d = mirror->double_field(fd->offset());
813 _out->print(INT64_FORMAT, *(int64_t*)&d);
814 break;
815 }
816 case T_ARRAY: // fall-through
817 case T_OBJECT:
818 if (!fd->is_null_free_inline_type()) {
819 _out->print("%s ", fd->signature()->as_quoted_ascii());
820 oop value = mirror->obj_field_acquire(fd->offset());
821 if (value == nullptr) {
822 if (field_type == T_ARRAY) {
823 _out->print("%d", -1);
824 }
825 _out->cr();
826 } else if (value->is_instance()) {
827 assert(field_type == T_OBJECT, "");
828 if (value->is_a(vmClasses::String_klass())) {
829 const char* ascii_value = java_lang_String::as_quoted_ascii(value);
830 _out->print("\"%s\"", (ascii_value != nullptr) ? ascii_value : "");
831 } else {
832 const char* klass_name = value->klass()->name()->as_quoted_ascii();
833 _out->print("%s", klass_name);
834 }
835 } else if (value->is_array()) {
836 arrayOop a = (arrayOop)value;
837 _out->print("%d", a->length());
838 if (value->is_objArray()) {
839 objArrayOop oa = (objArrayOop)value;
840 const char* klass_name = value->klass()->name()->as_quoted_ascii();
841 _out->print(" %s", klass_name);
842 }
843 } else {
844 ShouldNotReachHere();
845 }
846 break;
847 } else {
848 // handling of null free inline type
849 ResetNoHandleMark rnhm;
850 Thread* THREAD = Thread::current();
851 SignatureStream ss(fd->signature(), false);
852 Symbol* name = ss.as_symbol();
853 assert(!HAS_PENDING_EXCEPTION, "can resolve klass?");
854 InstanceKlass* holder = fd->field_holder();
855 InstanceKlass* k = SystemDictionary::find_instance_klass(THREAD, name,
856 Handle(THREAD, holder->class_loader()));
857 guarantee(k != nullptr && !HAS_PENDING_EXCEPTION, "can resolve klass?");
858 InlineKlass* vk = InlineKlass::cast(k);
859 oop obj;
860 if (is_flat) {
861 int field_offset = fd->offset() - vk->payload_offset();
862 obj = cast_to_oop(cast_from_oop<address>(mirror) + field_offset);
863 } else {
864 obj = mirror->obj_field_acquire(fd->offset());
865 }
866 InlineTypeFieldPrinter print_field(_out, obj);
867 vk->do_nonstatic_fields(&print_field);
868 break;
869 }
870 default:
871 ShouldNotReachHere();
872 }
873 }
874
875 const char *ciInstanceKlass::replay_name() const {
876 return CURRENT_ENV->replay_name(get_instanceKlass());
877 }
878
879 void ciInstanceKlass::dump_replay_instanceKlass(outputStream* out, InstanceKlass* ik) {
880 if (ik->is_hidden()) {
881 const char *name = CURRENT_ENV->dyno_name(ik);
882 if (name != nullptr) {
883 out->print_cr("instanceKlass %s # %s", name, ik->name()->as_quoted_ascii());
884 } else {
885 out->print_cr("# instanceKlass %s", ik->name()->as_quoted_ascii());
886 }
887 } else {
888 out->print_cr("instanceKlass %s", ik->name()->as_quoted_ascii());
889 }
890 }
891
892 GrowableArray<ciInstanceKlass*>* ciInstanceKlass::transitive_interfaces() const{
893 if (_transitive_interfaces == nullptr) {
894 const_cast<ciInstanceKlass*>(this)->compute_transitive_interfaces();
895 }
896 return _transitive_interfaces;
897 }
898
899 void ciInstanceKlass::compute_transitive_interfaces() {
900 GUARDED_VM_ENTRY(
901 InstanceKlass* ik = get_instanceKlass();
902 Array<InstanceKlass*>* interfaces = ik->transitive_interfaces();
903 int orig_length = interfaces->length();
904 Arena* arena = CURRENT_ENV->arena();
905 int transitive_interfaces_len = orig_length + (is_interface() ? 1 : 0);
906 GrowableArray<ciInstanceKlass*>* transitive_interfaces = new(arena)GrowableArray<ciInstanceKlass*>(arena, transitive_interfaces_len,
907 0, nullptr);
908 for (int i = 0; i < orig_length; i++) {
909 transitive_interfaces->append(CURRENT_ENV->get_instance_klass(interfaces->at(i)));
910 }
911 if (is_interface()) {
912 transitive_interfaces->append(this);
913 }
914 _transitive_interfaces = transitive_interfaces;
915 );
916 }
917
918 void ciInstanceKlass::dump_replay_data(outputStream* out) {
919 ResourceMark rm;
920
921 InstanceKlass* ik = get_instanceKlass();
922 ConstantPool* cp = ik->constants();
923
924 // Try to record related loaded classes
925 Klass* sub = ik->subklass();
926 while (sub != nullptr) {
927 if (sub->is_instance_klass()) {
928 InstanceKlass *isub = InstanceKlass::cast(sub);
929 dump_replay_instanceKlass(out, isub);
930 }
931 sub = sub->next_sibling();
932 }
933
934 // Dump out the state of the constant pool tags. During replay the
935 // tags will be validated for things which shouldn't change and
936 // classes will be resolved if the tags indicate that they were
937 // resolved at compile time.
938 const char *name = replay_name();
939 out->print("ciInstanceKlass %s %d %d %d", name,
940 is_linked(), is_initialized(), cp->length());
941 for (int index = 1; index < cp->length(); index++) {
942 out->print(" %d", cp->tags()->at(index));
943 }
944 out->cr();
945 if (is_initialized()) {
946 // Dump out the static final fields in case the compilation relies
947 // on their value for correct replay.
948 StaticFinalFieldPrinter sffp(out, name);
949 ik->do_local_static_fields(&sffp);
950 }
951 }
952
953 #ifdef ASSERT
954 bool ciInstanceKlass::debug_final_field_at(int offset) {
955 GUARDED_VM_ENTRY(
956 InstanceKlass* ik = get_instanceKlass();
957 fieldDescriptor fd;
958 if (ik->find_field_from_offset(offset, false, &fd)) {
959 return fd.is_final();
960 }
961 );
962 return false;
963 }
964
965 bool ciInstanceKlass::debug_stable_field_at(int offset) {
966 GUARDED_VM_ENTRY(
967 InstanceKlass* ik = get_instanceKlass();
968 fieldDescriptor fd;
969 if (ik->find_field_from_offset(offset, false, &fd)) {
970 return fd.is_stable();
971 }
972 );
973 return false;
974 }
975 #endif