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 } else if (field_off > field_offset) {
431 break;
432 }
433 }
434 return nullptr;
435 }
436
437 int ciInstanceKlass::field_index_by_offset(int offset) {
438 assert(contains_field_offset(offset), "invalid field 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 static int sort_field_by_offset(ciField** a, ciField** b) {
475 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
476 // (no worries about 32-bit overflow...)
477 }
478
479 const GrowableArray<ciField*> empty_field_array(0, MemTag::mtCompiler);
480
481 void ciInstanceKlass::compute_nonstatic_fields() {
482 assert(is_loaded(), "must be loaded");
483
484 if (_nonstatic_fields != nullptr) {
485 assert(_declared_nonstatic_fields != nullptr, "must be initialized at the same time, class %s", name()->as_utf8());
486 return;
487 }
488
489 if (!has_nonstatic_fields()) {
490 _declared_nonstatic_fields = &empty_field_array;
491 _nonstatic_fields = &empty_field_array;
492 return;
493 }
494 assert(!is_java_lang_Object(), "bootstrap OK");
495
496 ciInstanceKlass* super = this->super();
497 assert(super != nullptr, "must have a super class, current class: %s", name()->as_utf8());
498 super->compute_nonstatic_fields();
499 const GrowableArray<ciField*>* super_declared_fields = super->_declared_nonstatic_fields;;
500 const GrowableArray<ciField*>* super_fields = super->_nonstatic_fields;
501 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());
502
503 GUARDED_VM_ENTRY({
504 compute_nonstatic_fields_impl(super_declared_fields, super_fields);
505 });
506 }
507
508 void ciInstanceKlass::compute_nonstatic_fields_impl(const GrowableArray<ciField*>* super_declared_fields, const GrowableArray<ciField*>* super_fields) {
509 assert(_declared_nonstatic_fields == nullptr && _nonstatic_fields == nullptr, "initialized already");
510 ASSERT_IN_VM;
511 Arena* arena = CURRENT_ENV->arena();
512
513 InstanceKlass* this_klass = get_instanceKlass();
514 int declared_field_num = 0;
515 int field_num = 0;
516 for (JavaFieldStream fs(this_klass); !fs.done(); fs.next()) {
517 if (fs.access_flags().is_static()) {
518 continue;
519 }
520
521 declared_field_num++;
522
523 fieldDescriptor& fd = fs.field_descriptor();
524 if (fd.is_flat()) {
525 InlineKlass* k = this_klass->get_inline_type_field_klass(fd.index());
526 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass();
527 field_num += vk->nof_nonstatic_fields();
528 field_num += fd.has_null_marker() ? 1 : 0;
529 } else {
530 field_num++;
531 }
532 }
533
534 GrowableArray<ciField*>* tmp_declared_fields = nullptr;
535 if (declared_field_num != 0) {
536 tmp_declared_fields = new (arena) GrowableArray<ciField*>(arena, declared_field_num + super_declared_fields->length(), 0, nullptr);
537 tmp_declared_fields->appendAll(super_declared_fields);
538 }
539
540 GrowableArray<ciField*>* tmp_fields = nullptr;
541 if (field_num != 0) {
542 tmp_fields = new (arena) GrowableArray<ciField*>(arena, field_num + super_fields->length(), 0, nullptr);
543 tmp_fields->appendAll(super_fields);
544 }
545
546 // For later assertion
547 declared_field_num += super_declared_fields->length();
548 field_num += super_fields->length();
549
550 for (JavaFieldStream fs(this_klass); !fs.done(); fs.next()) {
551 if (fs.access_flags().is_static()) {
552 continue;
553 }
554
555 fieldDescriptor& fd = fs.field_descriptor();
556 ciField* declared_field = new (arena) ciField(&fd);
557 assert(tmp_declared_fields != nullptr, "should be initialized");
558 tmp_declared_fields->append(declared_field);
559
560 if (fd.is_flat()) {
561 // Flat fields are embedded
562 int field_offset = fd.offset();
563 Klass* k = get_instanceKlass()->get_inline_type_field_klass(fd.index());
564 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass();
565 // Iterate over fields of the flat inline type and copy them to 'this'
566 for (int i = 0; i < vk->nof_nonstatic_fields(); ++i) {
567 assert(tmp_fields != nullptr, "should be initialized");
568 tmp_fields->append(new (arena) ciField(declared_field, vk->nonstatic_field_at(i)));
569 }
570 if (fd.has_null_marker()) {
571 assert(tmp_fields != nullptr, "should be initialized");
572 tmp_fields->append(new (arena) ciField(declared_field));
573 }
574 } else {
575 assert(tmp_fields != nullptr, "should be initialized");
576 tmp_fields->append(declared_field);
577 }
578 }
579
580 // Now sort them by offset, ascending. In principle, they could mix with superclass fields.
581 if (tmp_declared_fields != nullptr) {
582 assert(tmp_declared_fields->length() == declared_field_num, "sanity check failed for class: %s, number of declared fields: %d, expected: %d",
583 name()->as_utf8(), tmp_declared_fields->length(), declared_field_num);
584 tmp_declared_fields->sort(sort_field_by_offset);
585 _declared_nonstatic_fields = tmp_declared_fields;
586 } else {
587 _declared_nonstatic_fields = super_declared_fields;
588 }
589
590 if (tmp_fields != nullptr) {
591 assert(tmp_fields->length() == field_num, "sanity check failed for class: %s, number of fields: %d, expected: %d",
592 name()->as_utf8(), tmp_fields->length(), field_num);
593 tmp_fields->sort(sort_field_by_offset);
594 _nonstatic_fields = tmp_fields;
595 } else {
596 _nonstatic_fields = super_fields;
597 }
598 }
599
600 bool ciInstanceKlass::compute_injected_fields_helper() {
601 ASSERT_IN_VM;
602 InstanceKlass* k = get_instanceKlass();
603
604 for (InternalFieldStream fs(k); !fs.done(); fs.next()) {
605 if (fs.access_flags().is_static()) continue;
606 return true;
607 }
608 return false;
609 }
610
611 void ciInstanceKlass::compute_injected_fields() {
612 assert(is_loaded(), "must be loaded");
613
614 int has_injected_fields = 0;
615 if (super() != nullptr && super()->has_injected_fields()) {
616 has_injected_fields = 1;
617 } else {
618 GUARDED_VM_ENTRY({
619 has_injected_fields = compute_injected_fields_helper() ? 1 : 0;
620 });
621 }
622 // may be concurrently initialized for shared ciInstanceKlass objects
623 assert(_has_injected_fields == -1 || _has_injected_fields == has_injected_fields, "broken concurrent initialization");
624 _has_injected_fields = has_injected_fields;
625 }
626
627 bool ciInstanceKlass::has_object_fields() const {
628 GUARDED_VM_ENTRY(
629 return get_instanceKlass()->nonstatic_oop_map_size() > 0;
630 );
631 }
632
633 bool ciInstanceKlass::compute_has_trusted_loader() {
634 ASSERT_IN_VM;
635 oop loader_oop = loader();
636 if (loader_oop == nullptr) {
637 return true; // bootstrap class loader
638 }
639 return java_lang_ClassLoader::is_trusted_loader(loader_oop);
640 }
641
642 // ------------------------------------------------------------------
643 // ciInstanceKlass::find_method
644 //
645 // Find a method in this klass.
646 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
647 VM_ENTRY_MARK;
648 InstanceKlass* k = get_instanceKlass();
649 Symbol* name_sym = name->get_symbol();
650 Symbol* sig_sym= signature->get_symbol();
651
652 Method* m = k->find_method(name_sym, sig_sym);
653 if (m == nullptr) return nullptr;
654
655 return CURRENT_THREAD_ENV->get_method(m);
656 }
657
658 // ------------------------------------------------------------------
659 // ciInstanceKlass::is_leaf_type
660 bool ciInstanceKlass::is_leaf_type() {
661 assert(is_loaded(), "must be loaded");
662 if (is_shared()) {
663 return is_final(); // approximately correct
664 } else {
665 return !has_subklass() && (nof_implementors() == 0);
666 }
667 }
668
669 // ------------------------------------------------------------------
670 // ciInstanceKlass::implementor
671 //
672 // Report an implementor of this interface.
673 // Note that there are various races here, since my copy
674 // of _nof_implementors might be out of date with respect
675 // to results returned by InstanceKlass::implementor.
676 // This is OK, since any dependencies we decide to assert
677 // will be checked later under the Compile_lock.
678 ciInstanceKlass* ciInstanceKlass::implementor() {
679 ciInstanceKlass* impl = _implementor;
680 if (impl == nullptr) {
681 if (is_shared()) {
682 impl = this; // assume a well-known interface never has a unique implementor
683 } else {
684 // Go into the VM to fetch the implementor.
685 VM_ENTRY_MARK;
686 InstanceKlass* ik = get_instanceKlass();
687 Klass* implk = ik->implementor();
688 if (implk != nullptr) {
689 if (implk == ik) {
690 // More than one implementors. Use 'this' in this case.
691 impl = this;
692 } else {
693 impl = CURRENT_THREAD_ENV->get_instance_klass(implk);
694 }
695 }
696 }
697 // Memoize this result.
698 _implementor = impl;
699 }
700 return impl;
701 }
702
703 bool ciInstanceKlass::can_be_inline_klass(bool is_exact) {
704 if (!EnableValhalla) {
705 return false;
706 }
707 if (!is_loaded() || is_inlinetype()) {
708 // Not loaded or known to be an inline klass
709 return true;
710 }
711 if (!is_exact) {
712 // Not exact, check if this is a valid super for an inline klass
713 VM_ENTRY_MARK;
714 return !get_instanceKlass()->access_flags().is_identity_class() || is_java_lang_Object() ;
715 }
716 return false;
717 }
718
719 // Utility class for printing of the contents of the static fields for
720 // use by compilation replay. It only prints out the information that
721 // could be consumed by the compiler, so for primitive types it prints
722 // out the actual value. For Strings it's the actual string value.
723 // For array types it it's first level array size since that's the
724 // only value which statically unchangeable. For all other reference
725 // types it simply prints out the dynamic type.
726
727 class StaticFieldPrinter : public FieldClosure {
728 protected:
729 outputStream* _out;
730 public:
731 StaticFieldPrinter(outputStream* out) :
732 _out(out) {
733 }
734 void do_field_helper(fieldDescriptor* fd, oop obj, bool is_flat);
735 };
736
737 class StaticFinalFieldPrinter : public StaticFieldPrinter {
738 const char* _holder;
739 public:
740 StaticFinalFieldPrinter(outputStream* out, const char* holder) :
741 StaticFieldPrinter(out), _holder(holder) {
742 }
743 void do_field(fieldDescriptor* fd) {
744 if (fd->is_final() && !fd->has_initial_value()) {
745 ResourceMark rm;
746 InstanceKlass* holder = fd->field_holder();
747 oop mirror = holder->java_mirror();
748 _out->print("staticfield %s %s ", _holder, fd->name()->as_quoted_ascii());
749 BasicType bt = fd->field_type();
750 if (bt != T_OBJECT && bt != T_ARRAY) {
751 _out->print("%s ", fd->signature()->as_quoted_ascii());
752 }
753 do_field_helper(fd, mirror, false);
754 _out->cr();
755 }
756 }
757 };
758
759 class InlineTypeFieldPrinter : public StaticFieldPrinter {
760 oop _obj;
761 public:
762 InlineTypeFieldPrinter(outputStream* out, oop obj) :
763 StaticFieldPrinter(out), _obj(obj) {
764 }
765 void do_field(fieldDescriptor* fd) {
766 do_field_helper(fd, _obj, true);
767 _out->print(" ");
768 }
769 };
770
771 void StaticFieldPrinter::do_field_helper(fieldDescriptor* fd, oop mirror, bool is_flat) {
772 BasicType field_type = fd->field_type();
773 switch (field_type) {
774 case T_BYTE: _out->print("%d", mirror->byte_field(fd->offset())); break;
775 case T_BOOLEAN: _out->print("%d", mirror->bool_field(fd->offset())); break;
776 case T_SHORT: _out->print("%d", mirror->short_field(fd->offset())); break;
777 case T_CHAR: _out->print("%d", mirror->char_field(fd->offset())); break;
778 case T_INT: _out->print("%d", mirror->int_field(fd->offset())); break;
779 case T_LONG: _out->print(INT64_FORMAT, (int64_t)(mirror->long_field(fd->offset()))); break;
780 case T_FLOAT: {
781 float f = mirror->float_field(fd->offset());
782 _out->print("%d", *(int*)&f);
783 break;
784 }
785 case T_DOUBLE: {
786 double d = mirror->double_field(fd->offset());
787 _out->print(INT64_FORMAT, *(int64_t*)&d);
788 break;
789 }
790 case T_ARRAY: // fall-through
791 case T_OBJECT:
792 if (!fd->is_null_free_inline_type()) {
793 _out->print("%s ", fd->signature()->as_quoted_ascii());
794 oop value = mirror->obj_field_acquire(fd->offset());
795 if (value == nullptr) {
796 if (field_type == T_ARRAY) {
797 _out->print("%d", -1);
798 }
799 _out->cr();
800 } else if (value->is_instance()) {
801 assert(field_type == T_OBJECT, "");
802 if (value->is_a(vmClasses::String_klass())) {
803 const char* ascii_value = java_lang_String::as_quoted_ascii(value);
804 _out->print("\"%s\"", (ascii_value != nullptr) ? ascii_value : "");
805 } else {
806 const char* klass_name = value->klass()->name()->as_quoted_ascii();
807 _out->print("%s", klass_name);
808 }
809 } else if (value->is_array()) {
810 typeArrayOop ta = (typeArrayOop)value;
811 _out->print("%d", ta->length());
812 if (value->is_objArray() || value->is_flatArray()) {
813 objArrayOop oa = (objArrayOop)value;
814 const char* klass_name = value->klass()->name()->as_quoted_ascii();
815 _out->print(" %s", klass_name);
816 }
817 } else {
818 ShouldNotReachHere();
819 }
820 break;
821 } else {
822 // handling of null free inline type
823 ResetNoHandleMark rnhm;
824 Thread* THREAD = Thread::current();
825 SignatureStream ss(fd->signature(), false);
826 Symbol* name = ss.as_symbol();
827 assert(!HAS_PENDING_EXCEPTION, "can resolve klass?");
828 InstanceKlass* holder = fd->field_holder();
829 InstanceKlass* k = SystemDictionary::find_instance_klass(THREAD, name,
830 Handle(THREAD, holder->class_loader()));
831 assert(k != nullptr && !HAS_PENDING_EXCEPTION, "can resolve klass?");
832 InlineKlass* vk = InlineKlass::cast(k);
833 oop obj;
834 if (is_flat) {
835 int field_offset = fd->offset() - vk->payload_offset();
836 obj = cast_to_oop(cast_from_oop<address>(mirror) + field_offset);
837 } else {
838 obj = mirror->obj_field_acquire(fd->offset());
839 }
840 InlineTypeFieldPrinter print_field(_out, obj);
841 vk->do_nonstatic_fields(&print_field);
842 break;
843 }
844 default:
845 ShouldNotReachHere();
846 }
847 }
848
849 const char *ciInstanceKlass::replay_name() const {
850 return CURRENT_ENV->replay_name(get_instanceKlass());
851 }
852
853 void ciInstanceKlass::dump_replay_instanceKlass(outputStream* out, InstanceKlass* ik) {
854 if (ik->is_hidden()) {
855 const char *name = CURRENT_ENV->dyno_name(ik);
856 if (name != nullptr) {
857 out->print_cr("instanceKlass %s # %s", name, ik->name()->as_quoted_ascii());
858 } else {
859 out->print_cr("# instanceKlass %s", ik->name()->as_quoted_ascii());
860 }
861 } else {
862 out->print_cr("instanceKlass %s", ik->name()->as_quoted_ascii());
863 }
864 }
865
866 GrowableArray<ciInstanceKlass*>* ciInstanceKlass::transitive_interfaces() const{
867 if (_transitive_interfaces == nullptr) {
868 const_cast<ciInstanceKlass*>(this)->compute_transitive_interfaces();
869 }
870 return _transitive_interfaces;
871 }
872
873 void ciInstanceKlass::compute_transitive_interfaces() {
874 GUARDED_VM_ENTRY(
875 InstanceKlass* ik = get_instanceKlass();
876 Array<InstanceKlass*>* interfaces = ik->transitive_interfaces();
877 int orig_length = interfaces->length();
878 Arena* arena = CURRENT_ENV->arena();
879 int transitive_interfaces_len = orig_length + (is_interface() ? 1 : 0);
880 GrowableArray<ciInstanceKlass*>* transitive_interfaces = new(arena)GrowableArray<ciInstanceKlass*>(arena, transitive_interfaces_len,
881 0, nullptr);
882 for (int i = 0; i < orig_length; i++) {
883 transitive_interfaces->append(CURRENT_ENV->get_instance_klass(interfaces->at(i)));
884 }
885 if (is_interface()) {
886 transitive_interfaces->append(this);
887 }
888 _transitive_interfaces = transitive_interfaces;
889 );
890 }
891
892 void ciInstanceKlass::dump_replay_data(outputStream* out) {
893 ResourceMark rm;
894
895 InstanceKlass* ik = get_instanceKlass();
896 ConstantPool* cp = ik->constants();
897
898 // Try to record related loaded classes
899 Klass* sub = ik->subklass();
900 while (sub != nullptr) {
901 if (sub->is_instance_klass()) {
902 InstanceKlass *isub = InstanceKlass::cast(sub);
903 dump_replay_instanceKlass(out, isub);
904 }
905 sub = sub->next_sibling();
906 }
907
908 // Dump out the state of the constant pool tags. During replay the
909 // tags will be validated for things which shouldn't change and
910 // classes will be resolved if the tags indicate that they were
911 // resolved at compile time.
912 const char *name = replay_name();
913 out->print("ciInstanceKlass %s %d %d %d", name,
914 is_linked(), is_initialized(), cp->length());
915 for (int index = 1; index < cp->length(); index++) {
916 out->print(" %d", cp->tags()->at(index));
917 }
918 out->cr();
919 if (is_initialized()) {
920 // Dump out the static final fields in case the compilation relies
921 // on their value for correct replay.
922 StaticFinalFieldPrinter sffp(out, name);
923 ik->do_local_static_fields(&sffp);
924 }
925 }
926
927 #ifdef ASSERT
928 bool ciInstanceKlass::debug_final_field_at(int offset) {
929 GUARDED_VM_ENTRY(
930 InstanceKlass* ik = get_instanceKlass();
931 fieldDescriptor fd;
932 if (ik->find_field_from_offset(offset, false, &fd)) {
933 return fd.is_final();
934 }
935 );
936 return false;
937 }
938
939 bool ciInstanceKlass::debug_stable_field_at(int offset) {
940 GUARDED_VM_ENTRY(
941 InstanceKlass* ik = get_instanceKlass();
942 fieldDescriptor fd;
943 if (ik->find_field_from_offset(offset, false, &fd)) {
944 return fd.is_stable();
945 }
946 );
947 return false;
948 }
949 #endif