1 /*
2 * Copyright (c) 1999, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/ciField.hpp"
27 #include "ci/ciInlineKlass.hpp"
28 #include "ci/ciInstance.hpp"
29 #include "ci/ciInstanceKlass.hpp"
30 #include "ci/ciUtilities.inline.hpp"
31 #include "classfile/javaClasses.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmClasses.hpp"
34 #include "memory/allocation.hpp"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "oops/instanceKlass.inline.hpp"
38 #include "oops/klass.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "oops/fieldStreams.inline.hpp"
41 #include "oops/inlineKlass.inline.hpp"
42 #include "runtime/fieldDescriptor.inline.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/jniHandles.inline.hpp"
45
46 // ciInstanceKlass
47 //
48 // This class represents a Klass* in the HotSpot virtual machine
49 // whose Klass part in an InstanceKlass.
50
51
52 // ------------------------------------------------------------------
53 // ciInstanceKlass::ciInstanceKlass
54 //
55 // Loaded instance klass.
56 ciInstanceKlass::ciInstanceKlass(Klass* k) :
57 ciKlass(k)
58 {
59 assert(get_Klass()->is_instance_klass(), "wrong type");
60 assert(get_instanceKlass()->is_loaded(), "must be at least loaded");
61 InstanceKlass* ik = get_instanceKlass();
62
63 AccessFlags access_flags = ik->access_flags();
64 _flags = ciFlags(access_flags);
65 _has_finalizer = ik->has_finalizer();
66 _has_subklass = flags().is_final() ? subklass_false : subklass_unknown;
67 _init_state = ik->init_state();
68 _has_nonstatic_fields = ik->has_nonstatic_fields();
69 _has_nonstatic_concrete_methods = ik->has_nonstatic_concrete_methods();
70 _is_hidden = ik->is_hidden();
71 _is_record = ik->is_record();
72 _nonstatic_fields = 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 _protection_domain = JNIHandles::make_local(thread,
97 ik->protection_domain());
98 _is_shared = false;
99 } else {
100 Handle h_loader(thread, ik->class_loader());
101 Handle h_protection_domain(thread, ik->protection_domain());
102 _loader = JNIHandles::make_global(h_loader);
103 _protection_domain = JNIHandles::make_global(h_protection_domain);
104 _is_shared = true;
105 }
106
107 _has_trusted_loader = compute_has_trusted_loader();
108
109 // Lazy fields get filled in only upon request.
110 _super = nullptr;
111 _java_mirror = nullptr;
112
113 if (is_shared()) {
114 if (k != vmClasses::Object_klass()) {
115 super();
116 }
117 //compute_nonstatic_fields(); // done outside of constructor
118 }
119
120 _field_cache = nullptr;
121 }
122
123 // Version for unloaded classes:
124 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
125 jobject loader, jobject protection_domain,
126 BasicType bt)
127 : ciKlass(name, bt)
128 {
129 assert(name->char_at(0) != JVM_SIGNATURE_ARRAY, "not an instance klass");
130 _init_state = (InstanceKlass::ClassState)0;
131 _has_nonstatic_fields = false;
132 _nonstatic_fields = nullptr; // initialized lazily by compute_nonstatic_fields
133 _has_injected_fields = -1;
134 _is_hidden = false;
135 _is_record = false;
136 _loader = loader;
137 _protection_domain = protection_domain;
138 _is_shared = false;
139 _super = nullptr;
140 _java_mirror = nullptr;
141 _field_cache = nullptr;
142 _has_trusted_loader = compute_has_trusted_loader();
143 }
144
145
146
147 // ------------------------------------------------------------------
148 // ciInstanceKlass::compute_shared_is_initialized
149 void ciInstanceKlass::compute_shared_init_state() {
150 GUARDED_VM_ENTRY(
151 InstanceKlass* ik = get_instanceKlass();
152 _init_state = ik->init_state();
153 )
154 }
155
156 // ------------------------------------------------------------------
157 // ciInstanceKlass::compute_shared_has_subklass
158 bool ciInstanceKlass::compute_shared_has_subklass() {
159 GUARDED_VM_ENTRY(
160 InstanceKlass* ik = get_instanceKlass();
161 _has_subklass = ik->subklass() != nullptr ? subklass_true : subklass_false;
162 return _has_subklass == subklass_true;
163 )
164 }
165
166 // ------------------------------------------------------------------
167 // ciInstanceKlass::loader
168 oop ciInstanceKlass::loader() {
169 ASSERT_IN_VM;
170 return JNIHandles::resolve(_loader);
171 }
172
173 // ------------------------------------------------------------------
174 // ciInstanceKlass::loader_handle
175 jobject ciInstanceKlass::loader_handle() {
176 return _loader;
177 }
178
179 // ------------------------------------------------------------------
180 // ciInstanceKlass::protection_domain
181 oop ciInstanceKlass::protection_domain() {
182 ASSERT_IN_VM;
183 return JNIHandles::resolve(_protection_domain);
184 }
185
186 // ------------------------------------------------------------------
187 // ciInstanceKlass::protection_domain_handle
188 jobject ciInstanceKlass::protection_domain_handle() {
189 return _protection_domain;
190 }
191
192 // ------------------------------------------------------------------
193 // ciInstanceKlass::field_cache
194 //
195 // Get the field cache associated with this klass.
196 ciConstantPoolCache* ciInstanceKlass::field_cache() {
197 if (is_shared()) {
198 return nullptr;
199 }
200 if (_field_cache == nullptr) {
201 assert(!is_java_lang_Object(), "Object has no fields");
202 Arena* arena = CURRENT_ENV->arena();
203 _field_cache = new (arena) ciConstantPoolCache(arena, 5);
204 }
205 return _field_cache;
206 }
207
208 // ------------------------------------------------------------------
209 // ciInstanceKlass::get_canonical_holder
210 //
211 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
212 #ifdef ASSERT
213 if (!(offset >= 0 && offset < layout_helper_size_in_bytes())) {
214 tty->print("*** get_canonical_holder(%d) on ", offset);
215 this->print();
216 tty->print_cr(" ***");
217 };
218 assert(offset >= 0 && offset < layout_helper_size_in_bytes(), "offset must be tame");
219 #endif
220
221 if (offset < instanceOopDesc::base_offset_in_bytes()) {
222 // All header offsets belong properly to java/lang/Object.
223 return CURRENT_ENV->Object_klass();
224 }
225
226 ciInstanceKlass* self = this;
227 assert(self->is_loaded(), "must be loaded to access field info");
228 ciField* field = self->get_field_by_offset(offset, false);
229 if (field != nullptr) {
230 return field->holder();
231 } else {
232 for (;;) {
233 assert(self->is_loaded(), "must be loaded to have size");
234 ciInstanceKlass* super = self->super();
235 if (super == nullptr ||
236 super->nof_nonstatic_fields() == 0 ||
237 super->layout_helper_size_in_bytes() <= offset) {
238 return self;
239 } else {
240 self = super; // return super->get_canonical_holder(offset)
241 }
242 }
243 }
244 }
245
246 // ------------------------------------------------------------------
247 // ciInstanceKlass::is_java_lang_Object
248 //
249 // Is this klass java.lang.Object?
250 bool ciInstanceKlass::is_java_lang_Object() const {
251 return equals(CURRENT_ENV->Object_klass());
252 }
253
254 // ------------------------------------------------------------------
255 // ciInstanceKlass::uses_default_loader
256 bool ciInstanceKlass::uses_default_loader() const {
257 // Note: We do not need to resolve the handle or enter the VM
258 // in order to test null-ness.
259 return _loader == nullptr;
260 }
261
262 // ------------------------------------------------------------------
263
264 /**
265 * Return basic type of boxed value for box klass or T_OBJECT if not.
266 */
267 BasicType ciInstanceKlass::box_klass_type() const {
268 if (uses_default_loader() && is_loaded()) {
269 return vmClasses::box_klass_type(get_Klass());
270 } else {
271 return T_OBJECT;
272 }
273 }
274
275 /**
276 * Is this boxing klass?
277 */
278 bool ciInstanceKlass::is_box_klass() const {
279 return is_java_primitive(box_klass_type());
280 }
281
282 /**
283 * Is this boxed value offset?
284 */
285 bool ciInstanceKlass::is_boxed_value_offset(int offset) const {
286 BasicType bt = box_klass_type();
287 return is_java_primitive(bt) &&
288 (offset == java_lang_boxing_object::value_offset(bt));
289 }
290
291 // ------------------------------------------------------------------
292 // ciInstanceKlass::is_in_package
293 //
294 // Is this klass in the given package?
295 bool ciInstanceKlass::is_in_package(const char* packagename, int len) {
296 // To avoid class loader mischief, this test always rejects application classes.
297 if (!uses_default_loader())
298 return false;
299 GUARDED_VM_ENTRY(
300 return is_in_package_impl(packagename, len);
301 )
302 }
303
304 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) {
305 ASSERT_IN_VM;
306
307 // If packagename contains trailing '/' exclude it from the
308 // prefix-test since we test for it explicitly.
309 if (packagename[len - 1] == '/')
310 len--;
311
312 if (!name()->starts_with(packagename, len))
313 return false;
314
315 // Test if the class name is something like "java/lang".
316 if ((len + 1) > name()->utf8_length())
317 return false;
318
319 // Test for trailing '/'
320 if (name()->char_at(len) != '/')
321 return false;
322
323 // Make sure it's not actually in a subpackage:
324 if (name()->index_of_at(len+1, "/", 1) >= 0)
325 return false;
326
327 return true;
328 }
329
330 // ------------------------------------------------------------------
331 // ciInstanceKlass::print_impl
332 //
333 // Implementation of the print method.
334 void ciInstanceKlass::print_impl(outputStream* st) {
335 ciKlass::print_impl(st);
336 GUARDED_VM_ENTRY(st->print(" loader=" INTPTR_FORMAT, p2i(loader()));)
337 if (is_loaded()) {
338 st->print(" initialized=%s finalized=%s subklass=%s size=%d flags=",
339 bool_to_str(is_initialized()),
340 bool_to_str(has_finalizer()),
341 bool_to_str(has_subklass()),
342 layout_helper());
343
344 _flags.print_klass_flags(st);
345
346 if (_super) {
347 st->print(" super=");
348 _super->print_name_on(st);
349 }
350 if (_java_mirror) {
351 st->print(" mirror=PRESENT");
352 }
353 }
354 }
355
356 // ------------------------------------------------------------------
357 // ciInstanceKlass::super
358 //
359 // Get the superklass of this klass.
360 ciInstanceKlass* ciInstanceKlass::super() {
361 assert(is_loaded(), "must be loaded");
362 if (_super == nullptr && !is_java_lang_Object()) {
363 GUARDED_VM_ENTRY(
364 Klass* super_klass = get_instanceKlass()->super();
365 _super = CURRENT_ENV->get_instance_klass(super_klass);
366 )
367 }
368 return _super;
369 }
370
371 // ------------------------------------------------------------------
372 // ciInstanceKlass::java_mirror
373 //
374 // Get the instance of java.lang.Class corresponding to this klass.
375 // Cache it on this->_java_mirror.
376 ciInstance* ciInstanceKlass::java_mirror() {
377 if (is_shared()) {
378 return ciKlass::java_mirror();
379 }
380 if (_java_mirror == nullptr) {
381 _java_mirror = ciKlass::java_mirror();
382 }
383 return _java_mirror;
384 }
385
386 // ------------------------------------------------------------------
387 // ciInstanceKlass::unique_concrete_subklass
388 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
389 if (!is_loaded()) return nullptr; // No change if class is not loaded
390 if (!is_abstract()) return nullptr; // Only applies to abstract classes.
391 if (!has_subklass()) return nullptr; // Must have at least one subklass.
392 VM_ENTRY_MARK;
393 InstanceKlass* ik = get_instanceKlass();
394 Klass* up = ik->up_cast_abstract();
395 assert(up->is_instance_klass(), "must be InstanceKlass");
396 if (ik == up) {
397 return nullptr;
398 }
399 return CURRENT_THREAD_ENV->get_instance_klass(up);
400 }
401
402 // ------------------------------------------------------------------
403 // ciInstanceKlass::has_finalizable_subclass
404 bool ciInstanceKlass::has_finalizable_subclass() {
405 if (!is_loaded()) return true;
406 VM_ENTRY_MARK;
407 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != nullptr;
408 }
409
410 // ------------------------------------------------------------------
411 // ciInstanceKlass::contains_field_offset
412 bool ciInstanceKlass::contains_field_offset(int offset) {
413 VM_ENTRY_MARK;
414 return get_instanceKlass()->contains_field_offset(offset);
415 }
416
417 // ------------------------------------------------------------------
418 // ciInstanceKlass::get_field_by_offset
419 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
420 if (!is_static) {
421 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
422 ciField* field = _nonstatic_fields->at(i);
423 int field_off = field->offset_in_bytes();
424 if (field_off == field_offset)
425 return field;
426 if (field_off > field_offset)
427 break;
428 // could do binary search or check bins, but probably not worth it
429 }
430 return nullptr;
431 }
432 VM_ENTRY_MARK;
433 InstanceKlass* k = get_instanceKlass();
434 fieldDescriptor fd;
435 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
436 return nullptr;
437 }
438 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
439 return field;
440 }
441
442 ciField* ciInstanceKlass::get_non_flat_field_by_offset(int field_offset) {
443 if (super() != nullptr && super()->has_nonstatic_fields()) {
444 ciField* f = super()->get_non_flat_field_by_offset(field_offset);
445 if (f != nullptr) {
446 return f;
447 }
448 }
449
450 VM_ENTRY_MARK;
451 InstanceKlass* k = get_instanceKlass();
452 Arena* arena = CURRENT_ENV->arena();
453 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
454 if (fs.access_flags().is_static()) continue;
455 fieldDescriptor& fd = fs.field_descriptor();
456 if (fd.offset() == field_offset) {
457 ciField* f = new (arena) ciField(&fd);
458 return f;
459 }
460 }
461
462 return nullptr;
463 }
464
465 // ------------------------------------------------------------------
466 // ciInstanceKlass::get_field_by_name
467 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
468 VM_ENTRY_MARK;
469 InstanceKlass* k = get_instanceKlass();
470 fieldDescriptor fd;
471 Klass* def = k->find_field(name->get_symbol(), signature->get_symbol(), is_static, &fd);
472 if (def == nullptr) {
473 return nullptr;
474 }
475 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
476 return field;
477 }
478
479
480 static int sort_field_by_offset(ciField** a, ciField** b) {
481 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
482 // (no worries about 32-bit overflow...)
483 }
484
485 // ------------------------------------------------------------------
486 // ciInstanceKlass::compute_nonstatic_fields
487 int ciInstanceKlass::compute_nonstatic_fields() {
488 assert(is_loaded(), "must be loaded");
489
490 if (_nonstatic_fields != nullptr)
491 return _nonstatic_fields->length();
492
493 if (!has_nonstatic_fields()) {
494 Arena* arena = CURRENT_ENV->arena();
495 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, nullptr);
496 return 0;
497 }
498 assert(!is_java_lang_Object(), "bootstrap OK");
499
500 ciInstanceKlass* super = this->super();
501 GrowableArray<ciField*>* super_fields = nullptr;
502 if (super != nullptr && super->has_nonstatic_fields()) {
503 int super_flen = super->nof_nonstatic_fields();
504 super_fields = super->_nonstatic_fields;
505 assert(super_flen == 0 || super_fields != nullptr, "first get nof_fields");
506 }
507
508 GrowableArray<ciField*>* fields = nullptr;
509 GUARDED_VM_ENTRY({
510 fields = compute_nonstatic_fields_impl(super_fields);
511 });
512
513 if (fields == nullptr) {
514 // This can happen if this class (java.lang.Class) has invisible fields.
515 if (super_fields != nullptr) {
516 _nonstatic_fields = super_fields;
517 return super_fields->length();
518 } else {
519 return 0;
520 }
521 }
522
523 _nonstatic_fields = fields;
524 return fields->length();
525 }
526
527 GrowableArray<ciField*>* ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields, bool is_flat) {
528 ASSERT_IN_VM;
529 Arena* arena = CURRENT_ENV->arena();
530 int flen = 0;
531 GrowableArray<ciField*>* fields = nullptr;
532 InstanceKlass* k = get_instanceKlass();
533 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
534 if (fs.access_flags().is_static()) continue;
535 flen += 1;
536 }
537
538 // allocate the array:
539 if (flen == 0) {
540 return nullptr; // return nothing if none are locally declared
541 }
542 if (super_fields != nullptr) {
543 flen += super_fields->length();
544 }
545 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, nullptr);
546 if (super_fields != nullptr) {
547 fields->appendAll(super_fields);
548 }
549
550 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
551 if (fs.access_flags().is_static()) continue;
552 fieldDescriptor& fd = fs.field_descriptor();
553 if (fd.is_flat() && is_flat) {
554 // Inline type fields are embedded
555 int field_offset = fd.offset();
556 // Get InlineKlass and adjust number of fields
557 Klass* k = get_instanceKlass()->get_inline_type_field_klass(fd.index());
558 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass();
559 flen += vk->nof_nonstatic_fields() - 1;
560 // Iterate over fields of the flat inline type and copy them to 'this'
561 for (int i = 0; i < vk->nof_nonstatic_fields(); ++i) {
562 ciField* flat_field = vk->nonstatic_field_at(i);
563 // Adjust offset to account for missing oop header
564 int offset = field_offset + (flat_field->offset_in_bytes() - vk->first_field_offset());
565 // A flat field can be treated as final if the non-flat
566 // field is declared final or the holder klass is an inline type itself.
567 bool is_final = fd.is_final() || is_inlinetype();
568 ciField* field = new (arena) ciField(flat_field, this, offset, is_final);
569 fields->append(field);
570 }
571 } else {
572 ciField* field = new (arena) ciField(&fd);
573 fields->append(field);
574 }
575 }
576 assert(fields->length() == flen, "sanity");
577 // Now sort them by offset, ascending.
578 // (In principle, they could mix with superclass fields.)
579 fields->sort(sort_field_by_offset);
580 return fields;
581 }
582
583 bool ciInstanceKlass::compute_injected_fields_helper() {
584 ASSERT_IN_VM;
585 InstanceKlass* k = get_instanceKlass();
586
587 for (InternalFieldStream fs(k); !fs.done(); fs.next()) {
588 if (fs.access_flags().is_static()) continue;
589 return true;
590 }
591 return false;
592 }
593
594 void ciInstanceKlass::compute_injected_fields() {
595 assert(is_loaded(), "must be loaded");
596
597 int has_injected_fields = 0;
598 if (super() != nullptr && super()->has_injected_fields()) {
599 has_injected_fields = 1;
600 } else {
601 GUARDED_VM_ENTRY({
602 has_injected_fields = compute_injected_fields_helper() ? 1 : 0;
603 });
604 }
605 // may be concurrently initialized for shared ciInstanceKlass objects
606 assert(_has_injected_fields == -1 || _has_injected_fields == has_injected_fields, "broken concurrent initialization");
607 _has_injected_fields = has_injected_fields;
608 }
609
610 bool ciInstanceKlass::has_object_fields() const {
611 GUARDED_VM_ENTRY(
612 return get_instanceKlass()->nonstatic_oop_map_size() > 0;
613 );
614 }
615
616 bool ciInstanceKlass::compute_has_trusted_loader() {
617 ASSERT_IN_VM;
618 oop loader_oop = loader();
619 if (loader_oop == nullptr) {
620 return true; // bootstrap class loader
621 }
622 return java_lang_ClassLoader::is_trusted_loader(loader_oop);
623 }
624
625 // ------------------------------------------------------------------
626 // ciInstanceKlass::find_method
627 //
628 // Find a method in this klass.
629 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
630 VM_ENTRY_MARK;
631 InstanceKlass* k = get_instanceKlass();
632 Symbol* name_sym = name->get_symbol();
633 Symbol* sig_sym= signature->get_symbol();
634
635 Method* m = k->find_method(name_sym, sig_sym);
636 if (m == nullptr) return nullptr;
637
638 return CURRENT_THREAD_ENV->get_method(m);
639 }
640
641 // ------------------------------------------------------------------
642 // ciInstanceKlass::is_leaf_type
643 bool ciInstanceKlass::is_leaf_type() {
644 assert(is_loaded(), "must be loaded");
645 if (is_shared()) {
646 return is_final(); // approximately correct
647 } else {
648 return !has_subklass() && (nof_implementors() == 0);
649 }
650 }
651
652 // ------------------------------------------------------------------
653 // ciInstanceKlass::implementor
654 //
655 // Report an implementor of this interface.
656 // Note that there are various races here, since my copy
657 // of _nof_implementors might be out of date with respect
658 // to results returned by InstanceKlass::implementor.
659 // This is OK, since any dependencies we decide to assert
660 // will be checked later under the Compile_lock.
661 ciInstanceKlass* ciInstanceKlass::implementor() {
662 ciInstanceKlass* impl = _implementor;
663 if (impl == nullptr) {
664 if (is_shared()) {
665 impl = this; // assume a well-known interface never has a unique implementor
666 } else {
667 // Go into the VM to fetch the implementor.
668 VM_ENTRY_MARK;
669 InstanceKlass* ik = get_instanceKlass();
670 Klass* implk = ik->implementor();
671 if (implk != nullptr) {
672 if (implk == ik) {
673 // More than one implementors. Use 'this' in this case.
674 impl = this;
675 } else {
676 impl = CURRENT_THREAD_ENV->get_instance_klass(implk);
677 }
678 }
679 }
680 // Memoize this result.
681 _implementor = impl;
682 }
683 return impl;
684 }
685
686 bool ciInstanceKlass::can_be_inline_klass(bool is_exact) {
687 if (!EnableValhalla) {
688 return false;
689 }
690 if (!is_loaded() || is_inlinetype()) {
691 // Not loaded or known to be an inline klass
692 return true;
693 }
694 if (!is_exact) {
695 // Not exact, check if this is a valid super for an inline klass
696 VM_ENTRY_MARK;
697 return !get_instanceKlass()->access_flags().is_identity_class() || is_java_lang_Object() ;
698 }
699 return false;
700 }
701
702 // Utility class for printing of the contents of the static fields for
703 // use by compilation replay. It only prints out the information that
704 // could be consumed by the compiler, so for primitive types it prints
705 // out the actual value. For Strings it's the actual string value.
706 // For array types it it's first level array size since that's the
707 // only value which statically unchangeable. For all other reference
708 // types it simply prints out the dynamic type.
709
710 class StaticFieldPrinter : public FieldClosure {
711 protected:
712 outputStream* _out;
713 public:
714 StaticFieldPrinter(outputStream* out) :
715 _out(out) {
716 }
717 void do_field_helper(fieldDescriptor* fd, oop obj, bool is_flat);
718 };
719
720 class StaticFinalFieldPrinter : public StaticFieldPrinter {
721 const char* _holder;
722 public:
723 StaticFinalFieldPrinter(outputStream* out, const char* holder) :
724 StaticFieldPrinter(out), _holder(holder) {
725 }
726 void do_field(fieldDescriptor* fd) {
727 if (fd->is_final() && !fd->has_initial_value()) {
728 ResourceMark rm;
729 InstanceKlass* holder = fd->field_holder();
730 oop mirror = holder->java_mirror();
731 _out->print("staticfield %s %s ", _holder, fd->name()->as_quoted_ascii());
732 BasicType bt = fd->field_type();
733 if (bt != T_OBJECT && bt != T_ARRAY) {
734 _out->print("%s ", fd->signature()->as_quoted_ascii());
735 }
736 do_field_helper(fd, mirror, false);
737 _out->cr();
738 }
739 }
740 };
741
742 class InlineTypeFieldPrinter : public StaticFieldPrinter {
743 oop _obj;
744 public:
745 InlineTypeFieldPrinter(outputStream* out, oop obj) :
746 StaticFieldPrinter(out), _obj(obj) {
747 }
748 void do_field(fieldDescriptor* fd) {
749 do_field_helper(fd, _obj, true);
750 _out->print(" ");
751 }
752 };
753
754 void StaticFieldPrinter::do_field_helper(fieldDescriptor* fd, oop mirror, bool is_flat) {
755 BasicType field_type = fd->field_type();
756 switch (field_type) {
757 case T_BYTE: _out->print("%d", mirror->byte_field(fd->offset())); break;
758 case T_BOOLEAN: _out->print("%d", mirror->bool_field(fd->offset())); break;
759 case T_SHORT: _out->print("%d", mirror->short_field(fd->offset())); break;
760 case T_CHAR: _out->print("%d", mirror->char_field(fd->offset())); break;
761 case T_INT: _out->print("%d", mirror->int_field(fd->offset())); break;
762 case T_LONG: _out->print(INT64_FORMAT, (int64_t)(mirror->long_field(fd->offset()))); break;
763 case T_FLOAT: {
764 float f = mirror->float_field(fd->offset());
765 _out->print("%d", *(int*)&f);
766 break;
767 }
768 case T_DOUBLE: {
769 double d = mirror->double_field(fd->offset());
770 _out->print(INT64_FORMAT, *(int64_t*)&d);
771 break;
772 }
773 case T_ARRAY: // fall-through
774 case T_OBJECT:
775 if (!fd->is_null_free_inline_type()) {
776 _out->print("%s ", fd->signature()->as_quoted_ascii());
777 oop value = mirror->obj_field_acquire(fd->offset());
778 if (value == nullptr) {
779 if (field_type == T_ARRAY) {
780 _out->print("%d", -1);
781 }
782 _out->cr();
783 } else if (value->is_instance()) {
784 assert(field_type == T_OBJECT, "");
785 if (value->is_a(vmClasses::String_klass())) {
786 const char* ascii_value = java_lang_String::as_quoted_ascii(value);
787 _out->print("\"%s\"", (ascii_value != nullptr) ? ascii_value : "");
788 } else {
789 const char* klass_name = value->klass()->name()->as_quoted_ascii();
790 _out->print("%s", klass_name);
791 }
792 } else if (value->is_array()) {
793 typeArrayOop ta = (typeArrayOop)value;
794 _out->print("%d", ta->length());
795 if (value->is_objArray() || value->is_flatArray()) {
796 objArrayOop oa = (objArrayOop)value;
797 const char* klass_name = value->klass()->name()->as_quoted_ascii();
798 _out->print(" %s", klass_name);
799 }
800 } else {
801 ShouldNotReachHere();
802 }
803 break;
804 } else {
805 // handling of null free inline type
806 ResetNoHandleMark rnhm;
807 Thread* THREAD = Thread::current();
808 SignatureStream ss(fd->signature(), false);
809 Symbol* name = ss.as_symbol();
810 assert(!HAS_PENDING_EXCEPTION, "can resolve klass?");
811 InstanceKlass* holder = fd->field_holder();
812 InstanceKlass* k = SystemDictionary::find_instance_klass(THREAD, name,
813 Handle(THREAD, holder->class_loader()),
814 Handle(THREAD, holder->protection_domain()));
815 assert(k != nullptr && !HAS_PENDING_EXCEPTION, "can resolve klass?");
816 InlineKlass* vk = InlineKlass::cast(k);
817 oop obj;
818 if (is_flat) {
819 int field_offset = fd->offset() - vk->first_field_offset();
820 obj = cast_to_oop(cast_from_oop<address>(mirror) + field_offset);
821 } else {
822 obj = mirror->obj_field_acquire(fd->offset());
823 }
824 InlineTypeFieldPrinter print_field(_out, obj);
825 vk->do_nonstatic_fields(&print_field);
826 break;
827 }
828 default:
829 ShouldNotReachHere();
830 }
831 }
832
833 const char *ciInstanceKlass::replay_name() const {
834 return CURRENT_ENV->replay_name(get_instanceKlass());
835 }
836
837 void ciInstanceKlass::dump_replay_instanceKlass(outputStream* out, InstanceKlass* ik) {
838 if (ik->is_hidden()) {
839 const char *name = CURRENT_ENV->dyno_name(ik);
840 if (name != nullptr) {
841 out->print_cr("instanceKlass %s # %s", name, ik->name()->as_quoted_ascii());
842 } else {
843 out->print_cr("# instanceKlass %s", ik->name()->as_quoted_ascii());
844 }
845 } else {
846 out->print_cr("instanceKlass %s", ik->name()->as_quoted_ascii());
847 }
848 }
849
850 GrowableArray<ciInstanceKlass*>* ciInstanceKlass::transitive_interfaces() const{
851 if (_transitive_interfaces == nullptr) {
852 const_cast<ciInstanceKlass*>(this)->compute_transitive_interfaces();
853 }
854 return _transitive_interfaces;
855 }
856
857 void ciInstanceKlass::compute_transitive_interfaces() {
858 GUARDED_VM_ENTRY(
859 InstanceKlass* ik = get_instanceKlass();
860 Array<InstanceKlass*>* interfaces = ik->transitive_interfaces();
861 int orig_length = interfaces->length();
862 Arena* arena = CURRENT_ENV->arena();
863 int transitive_interfaces_len = orig_length + (is_interface() ? 1 : 0);
864 GrowableArray<ciInstanceKlass*>* transitive_interfaces = new(arena)GrowableArray<ciInstanceKlass*>(arena, transitive_interfaces_len,
865 0, nullptr);
866 for (int i = 0; i < orig_length; i++) {
867 transitive_interfaces->append(CURRENT_ENV->get_instance_klass(interfaces->at(i)));
868 }
869 if (is_interface()) {
870 transitive_interfaces->append(this);
871 }
872 _transitive_interfaces = transitive_interfaces;
873 );
874 }
875
876 void ciInstanceKlass::dump_replay_data(outputStream* out) {
877 ResourceMark rm;
878
879 InstanceKlass* ik = get_instanceKlass();
880 ConstantPool* cp = ik->constants();
881
882 // Try to record related loaded classes
883 Klass* sub = ik->subklass();
884 while (sub != nullptr) {
885 if (sub->is_instance_klass()) {
886 InstanceKlass *isub = InstanceKlass::cast(sub);
887 dump_replay_instanceKlass(out, isub);
888 }
889 sub = sub->next_sibling();
890 }
891
892 // Dump out the state of the constant pool tags. During replay the
893 // tags will be validated for things which shouldn't change and
894 // classes will be resolved if the tags indicate that they were
895 // resolved at compile time.
896 const char *name = replay_name();
897 out->print("ciInstanceKlass %s %d %d %d", name,
898 is_linked(), is_initialized(), cp->length());
899 for (int index = 1; index < cp->length(); index++) {
900 out->print(" %d", cp->tags()->at(index));
901 }
902 out->cr();
903 if (is_initialized()) {
904 // Dump out the static final fields in case the compilation relies
905 // on their value for correct replay.
906 StaticFinalFieldPrinter sffp(out, name);
907 ik->do_local_static_fields(&sffp);
908 }
909 }
910
911 #ifdef ASSERT
912 bool ciInstanceKlass::debug_final_field_at(int offset) {
913 GUARDED_VM_ENTRY(
914 InstanceKlass* ik = get_instanceKlass();
915 fieldDescriptor fd;
916 if (ik->find_field_from_offset(offset, false, &fd)) {
917 return fd.is_final();
918 }
919 );
920 return false;
921 }
922
923 bool ciInstanceKlass::debug_stable_field_at(int offset) {
924 GUARDED_VM_ENTRY(
925 InstanceKlass* ik = get_instanceKlass();
926 fieldDescriptor fd;
927 if (ik->find_field_from_offset(offset, false, &fd)) {
928 return fd.is_stable();
929 }
930 );
931 return false;
932 }
933 #endif