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 _nonstatic_fields = nullptr; // initialized lazily by compute_nonstatic_fields:
72 _has_injected_fields = -1;
73 _implementor = nullptr; // we will fill these lazily
74 _transitive_interfaces = nullptr;
75
76 // Ensure that the metadata wrapped by the ciMetadata is kept alive by GC.
77 // This is primarily useful for metadata which is considered as weak roots
78 // by the GC but need to be strong roots if reachable from a current compilation.
79 // InstanceKlass are created for both weak and strong metadata. Ensuring this metadata
80 // alive covers the cases where there are weak roots without performance cost.
81 oop holder = ik->klass_holder();
82 if (ik->class_loader_data()->has_class_mirror_holder()) {
83 // Though ciInstanceKlass records class loader oop, it's not enough to keep
84 // non-strong hidden classes alive (loader == nullptr). Klass holder should
85 // be used instead. It is enough to record a ciObject, since cached elements are never removed
86 // during ciObjectFactory lifetime. ciObjectFactory itself is created for
87 // every compilation and lives for the whole duration of the compilation.
88 assert(holder != nullptr, "holder of hidden class is the mirror which is never null");
89 (void)CURRENT_ENV->get_object(holder);
90 }
91
92 JavaThread *thread = JavaThread::current();
93 if (ciObjectFactory::is_initialized()) {
94 _loader = JNIHandles::make_local(thread, ik->class_loader());
95 _is_shared = false;
96 } else {
97 Handle h_loader(thread, ik->class_loader());
98 _loader = JNIHandles::make_global(h_loader);
99 _is_shared = true;
100 }
101
102 _has_trusted_loader = compute_has_trusted_loader();
103
104 // Lazy fields get filled in only upon request.
105 _super = nullptr;
106 _java_mirror = nullptr;
107
108 if (is_shared()) {
109 if (k != vmClasses::Object_klass()) {
110 super();
111 }
112 //compute_nonstatic_fields(); // done outside of constructor
113 }
114
115 _field_cache = nullptr;
116 }
117
118 // Version for unloaded classes:
119 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
120 jobject loader,
121 BasicType bt)
122 : ciKlass(name, bt)
123 {
124 assert(name->char_at(0) != JVM_SIGNATURE_ARRAY, "not an instance klass");
125 _init_state = (InstanceKlass::ClassState)0;
126 _has_nonstatic_fields = false;
127 _nonstatic_fields = nullptr; // initialized lazily by compute_nonstatic_fields
128 _has_injected_fields = -1;
129 _is_hidden = false;
130 _is_record = false;
131 _loader = loader;
132 _is_shared = false;
133 _super = nullptr;
134 _java_mirror = nullptr;
135 _field_cache = nullptr;
136 _has_trusted_loader = compute_has_trusted_loader();
137 }
138
139
140
141 // ------------------------------------------------------------------
142 // ciInstanceKlass::compute_shared_is_initialized
143 void ciInstanceKlass::compute_shared_init_state() {
144 GUARDED_VM_ENTRY(
145 InstanceKlass* ik = get_instanceKlass();
146 _init_state = ik->init_state();
147 )
148 }
149
150 // ------------------------------------------------------------------
151 // ciInstanceKlass::compute_shared_has_subklass
152 bool ciInstanceKlass::compute_shared_has_subklass() {
153 GUARDED_VM_ENTRY(
154 InstanceKlass* ik = get_instanceKlass();
155 _has_subklass = ik->subklass() != nullptr ? subklass_true : subklass_false;
156 return _has_subklass == subklass_true;
157 )
158 }
159
160 // ------------------------------------------------------------------
161 // ciInstanceKlass::loader
162 oop ciInstanceKlass::loader() {
163 ASSERT_IN_VM;
164 return JNIHandles::resolve(_loader);
165 }
166
167 // ------------------------------------------------------------------
168 // ciInstanceKlass::loader_handle
169 jobject ciInstanceKlass::loader_handle() {
170 return _loader;
171 }
172
173 // ------------------------------------------------------------------
174 // ciInstanceKlass::field_cache
175 //
176 // Get the field cache associated with this klass.
177 ciConstantPoolCache* ciInstanceKlass::field_cache() {
178 if (is_shared()) {
179 return nullptr;
180 }
181 if (_field_cache == nullptr) {
182 assert(!is_java_lang_Object(), "Object has no fields");
183 Arena* arena = CURRENT_ENV->arena();
184 _field_cache = new (arena) ciConstantPoolCache(arena, 5);
185 }
186 return _field_cache;
187 }
188
189 // ------------------------------------------------------------------
190 // ciInstanceKlass::get_canonical_holder
191 //
192 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
193 #ifdef ASSERT
194 if (!(offset >= 0 && offset < layout_helper_size_in_bytes())) {
195 tty->print("*** get_canonical_holder(%d) on ", offset);
196 this->print();
197 tty->print_cr(" ***");
198 };
199 assert(offset >= 0 && offset < layout_helper_size_in_bytes(), "offset must be tame");
200 #endif
201
202 if (offset < instanceOopDesc::base_offset_in_bytes()) {
203 // All header offsets belong properly to java/lang/Object.
204 return CURRENT_ENV->Object_klass();
205 }
206
207 ciInstanceKlass* self = this;
208 assert(self->is_loaded(), "must be loaded to access field info");
209 ciField* field = self->get_field_by_offset(offset, false);
210 if (field != nullptr) {
211 return field->holder();
212 } else {
213 for (;;) {
214 assert(self->is_loaded(), "must be loaded to have size");
215 ciInstanceKlass* super = self->super();
216 if (super == nullptr ||
217 super->nof_nonstatic_fields() == 0 ||
218 super->layout_helper_size_in_bytes() <= offset) {
219 return self;
220 } else {
221 self = super; // return super->get_canonical_holder(offset)
222 }
223 }
224 }
225 }
226
227 // ------------------------------------------------------------------
228 // ciInstanceKlass::is_java_lang_Object
229 //
230 // Is this klass java.lang.Object?
231 bool ciInstanceKlass::is_java_lang_Object() const {
232 return equals(CURRENT_ENV->Object_klass());
233 }
234
235 // ------------------------------------------------------------------
236 // ciInstanceKlass::uses_default_loader
237 bool ciInstanceKlass::uses_default_loader() const {
238 // Note: We do not need to resolve the handle or enter the VM
239 // in order to test null-ness.
240 return _loader == nullptr;
241 }
242
243 // ------------------------------------------------------------------
244
245 /**
246 * Return basic type of boxed value for box klass or T_OBJECT if not.
247 */
248 BasicType ciInstanceKlass::box_klass_type() const {
249 if (uses_default_loader() && is_loaded()) {
250 return vmClasses::box_klass_type(get_Klass());
251 } else {
252 return T_OBJECT;
253 }
254 }
255
256 /**
257 * Is this boxing klass?
258 */
259 bool ciInstanceKlass::is_box_klass() const {
260 return is_java_primitive(box_klass_type());
261 }
262
263 /**
264 * Is this boxed value offset?
265 */
266 bool ciInstanceKlass::is_boxed_value_offset(int offset) const {
267 BasicType bt = box_klass_type();
268 return is_java_primitive(bt) &&
269 (offset == java_lang_boxing_object::value_offset(bt));
270 }
271
272 // ------------------------------------------------------------------
273 // ciInstanceKlass::is_in_package
274 //
275 // Is this klass in the given package?
276 bool ciInstanceKlass::is_in_package(const char* packagename, int len) {
277 // To avoid class loader mischief, this test always rejects application classes.
278 if (!uses_default_loader())
279 return false;
280 GUARDED_VM_ENTRY(
281 return is_in_package_impl(packagename, len);
282 )
283 }
284
285 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) {
286 ASSERT_IN_VM;
287
288 // If packagename contains trailing '/' exclude it from the
289 // prefix-test since we test for it explicitly.
290 if (packagename[len - 1] == '/')
291 len--;
292
293 if (!name()->starts_with(packagename, len))
294 return false;
295
296 // Test if the class name is something like "java/lang".
297 if ((len + 1) > name()->utf8_length())
298 return false;
299
300 // Test for trailing '/'
301 if (name()->char_at(len) != '/')
302 return false;
303
304 // Make sure it's not actually in a subpackage:
305 if (name()->index_of_at(len+1, "/", 1) >= 0)
306 return false;
307
308 return true;
309 }
310
311 // ------------------------------------------------------------------
312 // ciInstanceKlass::print_impl
313 //
314 // Implementation of the print method.
315 void ciInstanceKlass::print_impl(outputStream* st) {
316 ciKlass::print_impl(st);
317 GUARDED_VM_ENTRY(st->print(" loader=" INTPTR_FORMAT, p2i(loader()));)
318 if (is_loaded()) {
319 st->print(" initialized=%s finalized=%s subklass=%s size=%d flags=",
320 bool_to_str(is_initialized()),
321 bool_to_str(has_finalizer()),
322 bool_to_str(has_subklass()),
323 layout_helper());
324
325 _flags.print_klass_flags(st);
326
327 if (_super) {
328 st->print(" super=");
329 _super->print_name_on(st);
330 }
331 if (_java_mirror) {
332 st->print(" mirror=PRESENT");
333 }
334 }
335 }
336
337 // ------------------------------------------------------------------
338 // ciInstanceKlass::super
339 //
340 // Get the superklass of this klass.
341 ciInstanceKlass* ciInstanceKlass::super() {
342 assert(is_loaded(), "must be loaded");
343 if (_super == nullptr && !is_java_lang_Object()) {
344 GUARDED_VM_ENTRY(
345 Klass* super_klass = get_instanceKlass()->super();
346 _super = CURRENT_ENV->get_instance_klass(super_klass);
347 )
348 }
349 return _super;
350 }
351
352 // ------------------------------------------------------------------
353 // ciInstanceKlass::java_mirror
354 //
355 // Get the instance of java.lang.Class corresponding to this klass.
356 // Cache it on this->_java_mirror.
357 ciInstance* ciInstanceKlass::java_mirror() {
358 if (is_shared()) {
359 return ciKlass::java_mirror();
360 }
361 if (_java_mirror == nullptr) {
362 _java_mirror = ciKlass::java_mirror();
363 }
364 return _java_mirror;
365 }
366
367 // ------------------------------------------------------------------
368 // ciInstanceKlass::unique_concrete_subklass
369 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
370 if (!is_loaded()) return nullptr; // No change if class is not loaded
371 if (!is_abstract()) return nullptr; // Only applies to abstract classes.
372 if (!has_subklass()) return nullptr; // Must have at least one subklass.
373 VM_ENTRY_MARK;
374 InstanceKlass* ik = get_instanceKlass();
375 Klass* up = ik->up_cast_abstract();
376 assert(up->is_instance_klass(), "must be InstanceKlass");
377 if (ik == up) {
378 return nullptr;
379 }
380 return CURRENT_THREAD_ENV->get_instance_klass(up);
381 }
382
383 // ------------------------------------------------------------------
384 // ciInstanceKlass::has_finalizable_subclass
385 bool ciInstanceKlass::has_finalizable_subclass() {
386 if (!is_loaded()) return true;
387 VM_ENTRY_MARK;
388 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != nullptr;
389 }
390
391 // ------------------------------------------------------------------
392 // ciInstanceKlass::contains_field_offset
393 bool ciInstanceKlass::contains_field_offset(int offset) {
394 VM_ENTRY_MARK;
395 return get_instanceKlass()->contains_field_offset(offset);
396 }
397
398 // ------------------------------------------------------------------
399 // ciInstanceKlass::get_field_by_offset
400 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
401 if (!is_static) {
402 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
403 ciField* field = _nonstatic_fields->at(i);
404 int field_off = field->offset_in_bytes();
405 if (field_off == field_offset)
406 return field;
407 }
408 return nullptr;
409 }
410 VM_ENTRY_MARK;
411 InstanceKlass* k = get_instanceKlass();
412 fieldDescriptor fd;
413 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
414 return nullptr;
415 }
416 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
417 return field;
418 }
419
420 ciField* ciInstanceKlass::get_non_flat_field_by_offset(int field_offset) {
421 if (super() != nullptr && super()->has_nonstatic_fields()) {
422 ciField* f = super()->get_non_flat_field_by_offset(field_offset);
423 if (f != nullptr) {
424 return f;
425 }
426 }
427
428 VM_ENTRY_MARK;
429 InstanceKlass* k = get_instanceKlass();
430 Arena* arena = CURRENT_ENV->arena();
431 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
432 if (fs.access_flags().is_static()) continue;
433 fieldDescriptor& fd = fs.field_descriptor();
434 if (fd.offset() == field_offset) {
435 ciField* f = new (arena) ciField(&fd);
436 return f;
437 }
438 }
439
440 return nullptr;
441 }
442
443 // ------------------------------------------------------------------
444 // ciInstanceKlass::get_field_by_name
445 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
446 VM_ENTRY_MARK;
447 InstanceKlass* k = get_instanceKlass();
448 fieldDescriptor fd;
449 Klass* def = k->find_field(name->get_symbol(), signature->get_symbol(), is_static, &fd);
450 if (def == nullptr) {
451 return nullptr;
452 }
453 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
454 return field;
455 }
456
457 static int sort_field_by_offset(ciField** a, ciField** b) {
458 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
459 // (no worries about 32-bit overflow...)
460 }
461
462 // ------------------------------------------------------------------
463 // ciInstanceKlass::compute_nonstatic_fields
464 int ciInstanceKlass::compute_nonstatic_fields() {
465 assert(is_loaded(), "must be loaded");
466
467 if (_nonstatic_fields != nullptr)
468 return _nonstatic_fields->length();
469
470 if (!has_nonstatic_fields()) {
471 Arena* arena = CURRENT_ENV->arena();
472 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, nullptr);
473 return 0;
474 }
475 assert(!is_java_lang_Object(), "bootstrap OK");
476
477 ciInstanceKlass* super = this->super();
478 GrowableArray<ciField*>* super_fields = nullptr;
479 if (super != nullptr && super->has_nonstatic_fields()) {
480 int super_flen = super->nof_nonstatic_fields();
481 super_fields = super->_nonstatic_fields;
482 assert(super_flen == 0 || super_fields != nullptr, "first get nof_fields");
483 }
484
485 GrowableArray<ciField*>* fields = nullptr;
486 GUARDED_VM_ENTRY({
487 fields = compute_nonstatic_fields_impl(super_fields);
488 });
489
490 if (fields == nullptr) {
491 // This can happen if this class (java.lang.Class) has invisible fields.
492 if (super_fields != nullptr) {
493 _nonstatic_fields = super_fields;
494 return super_fields->length();
495 } else {
496 return 0;
497 }
498 }
499
500 _nonstatic_fields = fields;
501 return fields->length();
502 }
503
504 GrowableArray<ciField*>* ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields, bool is_flat) {
505 ASSERT_IN_VM;
506 Arena* arena = CURRENT_ENV->arena();
507 int flen = 0;
508 GrowableArray<ciField*>* fields = nullptr;
509 InstanceKlass* k = get_instanceKlass();
510 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
511 if (fs.access_flags().is_static()) continue;
512 flen += 1;
513 }
514
515 // allocate the array:
516 if (flen == 0 && !is_inlinetype()) {
517 return nullptr; // return nothing if none are locally declared
518 }
519 if (super_fields != nullptr) {
520 flen += super_fields->length();
521 }
522 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, nullptr);
523 if (super_fields != nullptr) {
524 fields->appendAll(super_fields);
525 }
526
527 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
528 if (fs.access_flags().is_static()) continue;
529 fieldDescriptor& fd = fs.field_descriptor();
530 if (fd.is_flat() && is_flat) {
531 // Inline type fields are embedded
532 int field_offset = fd.offset();
533 // Get InlineKlass and adjust number of fields
534 Klass* k = get_instanceKlass()->get_inline_type_field_klass(fd.index());
535 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass();
536 flen += vk->nof_nonstatic_fields() - 1;
537 // Iterate over fields of the flat inline type and copy them to 'this'
538 for (int i = 0; i < vk->nof_nonstatic_fields(); ++i) {
539 ciField* flat_field = vk->nonstatic_field_at(i);
540 // Adjust offset to account for missing oop header
541 int offset = field_offset + (flat_field->offset_in_bytes() - vk->payload_offset());
542 // A flat field can be treated as final if the non-flat
543 // field is declared final or the holder klass is an inline type itself.
544 bool is_final = fd.is_final() || is_inlinetype();
545 ciField* field = new (arena) ciField(flat_field, this, offset, is_final);
546 fields->append(field);
547 }
548 } else {
549 ciField* field = new (arena) ciField(&fd);
550 fields->append(field);
551 }
552 }
553 assert(fields->length() == flen, "sanity");
554 fields->sort(sort_field_by_offset);
555 return fields;
556 }
557
558 bool ciInstanceKlass::compute_injected_fields_helper() {
559 ASSERT_IN_VM;
560 InstanceKlass* k = get_instanceKlass();
561
562 for (InternalFieldStream fs(k); !fs.done(); fs.next()) {
563 if (fs.access_flags().is_static()) continue;
564 return true;
565 }
566 return false;
567 }
568
569 void ciInstanceKlass::compute_injected_fields() {
570 assert(is_loaded(), "must be loaded");
571
572 int has_injected_fields = 0;
573 if (super() != nullptr && super()->has_injected_fields()) {
574 has_injected_fields = 1;
575 } else {
576 GUARDED_VM_ENTRY({
577 has_injected_fields = compute_injected_fields_helper() ? 1 : 0;
578 });
579 }
580 // may be concurrently initialized for shared ciInstanceKlass objects
581 assert(_has_injected_fields == -1 || _has_injected_fields == has_injected_fields, "broken concurrent initialization");
582 _has_injected_fields = has_injected_fields;
583 }
584
585 bool ciInstanceKlass::has_object_fields() const {
586 GUARDED_VM_ENTRY(
587 return get_instanceKlass()->nonstatic_oop_map_size() > 0;
588 );
589 }
590
591 bool ciInstanceKlass::compute_has_trusted_loader() {
592 ASSERT_IN_VM;
593 oop loader_oop = loader();
594 if (loader_oop == nullptr) {
595 return true; // bootstrap class loader
596 }
597 return java_lang_ClassLoader::is_trusted_loader(loader_oop);
598 }
599
600 // ------------------------------------------------------------------
601 // ciInstanceKlass::find_method
602 //
603 // Find a method in this klass.
604 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
605 VM_ENTRY_MARK;
606 InstanceKlass* k = get_instanceKlass();
607 Symbol* name_sym = name->get_symbol();
608 Symbol* sig_sym= signature->get_symbol();
609
610 Method* m = k->find_method(name_sym, sig_sym);
611 if (m == nullptr) return nullptr;
612
613 return CURRENT_THREAD_ENV->get_method(m);
614 }
615
616 // ------------------------------------------------------------------
617 // ciInstanceKlass::is_leaf_type
618 bool ciInstanceKlass::is_leaf_type() {
619 assert(is_loaded(), "must be loaded");
620 if (is_shared()) {
621 return is_final(); // approximately correct
622 } else {
623 return !has_subklass() && (nof_implementors() == 0);
624 }
625 }
626
627 // ------------------------------------------------------------------
628 // ciInstanceKlass::implementor
629 //
630 // Report an implementor of this interface.
631 // Note that there are various races here, since my copy
632 // of _nof_implementors might be out of date with respect
633 // to results returned by InstanceKlass::implementor.
634 // This is OK, since any dependencies we decide to assert
635 // will be checked later under the Compile_lock.
636 ciInstanceKlass* ciInstanceKlass::implementor() {
637 ciInstanceKlass* impl = _implementor;
638 if (impl == nullptr) {
639 if (is_shared()) {
640 impl = this; // assume a well-known interface never has a unique implementor
641 } else {
642 // Go into the VM to fetch the implementor.
643 VM_ENTRY_MARK;
644 InstanceKlass* ik = get_instanceKlass();
645 Klass* implk = ik->implementor();
646 if (implk != nullptr) {
647 if (implk == ik) {
648 // More than one implementors. Use 'this' in this case.
649 impl = this;
650 } else {
651 impl = CURRENT_THREAD_ENV->get_instance_klass(implk);
652 }
653 }
654 }
655 // Memoize this result.
656 _implementor = impl;
657 }
658 return impl;
659 }
660
661 bool ciInstanceKlass::can_be_inline_klass(bool is_exact) {
662 if (!EnableValhalla) {
663 return false;
664 }
665 if (!is_loaded() || is_inlinetype()) {
666 // Not loaded or known to be an inline klass
667 return true;
668 }
669 if (!is_exact) {
670 // Not exact, check if this is a valid super for an inline klass
671 VM_ENTRY_MARK;
672 return !get_instanceKlass()->access_flags().is_identity_class() || is_java_lang_Object() ;
673 }
674 return false;
675 }
676
677 // Utility class for printing of the contents of the static fields for
678 // use by compilation replay. It only prints out the information that
679 // could be consumed by the compiler, so for primitive types it prints
680 // out the actual value. For Strings it's the actual string value.
681 // For array types it it's first level array size since that's the
682 // only value which statically unchangeable. For all other reference
683 // types it simply prints out the dynamic type.
684
685 class StaticFieldPrinter : public FieldClosure {
686 protected:
687 outputStream* _out;
688 public:
689 StaticFieldPrinter(outputStream* out) :
690 _out(out) {
691 }
692 void do_field_helper(fieldDescriptor* fd, oop obj, bool is_flat);
693 };
694
695 class StaticFinalFieldPrinter : public StaticFieldPrinter {
696 const char* _holder;
697 public:
698 StaticFinalFieldPrinter(outputStream* out, const char* holder) :
699 StaticFieldPrinter(out), _holder(holder) {
700 }
701 void do_field(fieldDescriptor* fd) {
702 if (fd->is_final() && !fd->has_initial_value()) {
703 ResourceMark rm;
704 InstanceKlass* holder = fd->field_holder();
705 oop mirror = holder->java_mirror();
706 _out->print("staticfield %s %s ", _holder, fd->name()->as_quoted_ascii());
707 BasicType bt = fd->field_type();
708 if (bt != T_OBJECT && bt != T_ARRAY) {
709 _out->print("%s ", fd->signature()->as_quoted_ascii());
710 }
711 do_field_helper(fd, mirror, false);
712 _out->cr();
713 }
714 }
715 };
716
717 class InlineTypeFieldPrinter : public StaticFieldPrinter {
718 oop _obj;
719 public:
720 InlineTypeFieldPrinter(outputStream* out, oop obj) :
721 StaticFieldPrinter(out), _obj(obj) {
722 }
723 void do_field(fieldDescriptor* fd) {
724 do_field_helper(fd, _obj, true);
725 _out->print(" ");
726 }
727 };
728
729 void StaticFieldPrinter::do_field_helper(fieldDescriptor* fd, oop mirror, bool is_flat) {
730 BasicType field_type = fd->field_type();
731 switch (field_type) {
732 case T_BYTE: _out->print("%d", mirror->byte_field(fd->offset())); break;
733 case T_BOOLEAN: _out->print("%d", mirror->bool_field(fd->offset())); break;
734 case T_SHORT: _out->print("%d", mirror->short_field(fd->offset())); break;
735 case T_CHAR: _out->print("%d", mirror->char_field(fd->offset())); break;
736 case T_INT: _out->print("%d", mirror->int_field(fd->offset())); break;
737 case T_LONG: _out->print(INT64_FORMAT, (int64_t)(mirror->long_field(fd->offset()))); break;
738 case T_FLOAT: {
739 float f = mirror->float_field(fd->offset());
740 _out->print("%d", *(int*)&f);
741 break;
742 }
743 case T_DOUBLE: {
744 double d = mirror->double_field(fd->offset());
745 _out->print(INT64_FORMAT, *(int64_t*)&d);
746 break;
747 }
748 case T_ARRAY: // fall-through
749 case T_OBJECT:
750 if (!fd->is_null_free_inline_type()) {
751 _out->print("%s ", fd->signature()->as_quoted_ascii());
752 oop value = mirror->obj_field_acquire(fd->offset());
753 if (value == nullptr) {
754 if (field_type == T_ARRAY) {
755 _out->print("%d", -1);
756 }
757 _out->cr();
758 } else if (value->is_instance()) {
759 assert(field_type == T_OBJECT, "");
760 if (value->is_a(vmClasses::String_klass())) {
761 const char* ascii_value = java_lang_String::as_quoted_ascii(value);
762 _out->print("\"%s\"", (ascii_value != nullptr) ? ascii_value : "");
763 } else {
764 const char* klass_name = value->klass()->name()->as_quoted_ascii();
765 _out->print("%s", klass_name);
766 }
767 } else if (value->is_array()) {
768 typeArrayOop ta = (typeArrayOop)value;
769 _out->print("%d", ta->length());
770 if (value->is_objArray() || value->is_flatArray()) {
771 objArrayOop oa = (objArrayOop)value;
772 const char* klass_name = value->klass()->name()->as_quoted_ascii();
773 _out->print(" %s", klass_name);
774 }
775 } else {
776 ShouldNotReachHere();
777 }
778 break;
779 } else {
780 // handling of null free inline type
781 ResetNoHandleMark rnhm;
782 Thread* THREAD = Thread::current();
783 SignatureStream ss(fd->signature(), false);
784 Symbol* name = ss.as_symbol();
785 assert(!HAS_PENDING_EXCEPTION, "can resolve klass?");
786 InstanceKlass* holder = fd->field_holder();
787 InstanceKlass* k = SystemDictionary::find_instance_klass(THREAD, name,
788 Handle(THREAD, holder->class_loader()));
789 assert(k != nullptr && !HAS_PENDING_EXCEPTION, "can resolve klass?");
790 InlineKlass* vk = InlineKlass::cast(k);
791 oop obj;
792 if (is_flat) {
793 int field_offset = fd->offset() - vk->payload_offset();
794 obj = cast_to_oop(cast_from_oop<address>(mirror) + field_offset);
795 } else {
796 obj = mirror->obj_field_acquire(fd->offset());
797 }
798 InlineTypeFieldPrinter print_field(_out, obj);
799 vk->do_nonstatic_fields(&print_field);
800 break;
801 }
802 default:
803 ShouldNotReachHere();
804 }
805 }
806
807 const char *ciInstanceKlass::replay_name() const {
808 return CURRENT_ENV->replay_name(get_instanceKlass());
809 }
810
811 void ciInstanceKlass::dump_replay_instanceKlass(outputStream* out, InstanceKlass* ik) {
812 if (ik->is_hidden()) {
813 const char *name = CURRENT_ENV->dyno_name(ik);
814 if (name != nullptr) {
815 out->print_cr("instanceKlass %s # %s", name, ik->name()->as_quoted_ascii());
816 } else {
817 out->print_cr("# instanceKlass %s", ik->name()->as_quoted_ascii());
818 }
819 } else {
820 out->print_cr("instanceKlass %s", ik->name()->as_quoted_ascii());
821 }
822 }
823
824 GrowableArray<ciInstanceKlass*>* ciInstanceKlass::transitive_interfaces() const{
825 if (_transitive_interfaces == nullptr) {
826 const_cast<ciInstanceKlass*>(this)->compute_transitive_interfaces();
827 }
828 return _transitive_interfaces;
829 }
830
831 void ciInstanceKlass::compute_transitive_interfaces() {
832 GUARDED_VM_ENTRY(
833 InstanceKlass* ik = get_instanceKlass();
834 Array<InstanceKlass*>* interfaces = ik->transitive_interfaces();
835 int orig_length = interfaces->length();
836 Arena* arena = CURRENT_ENV->arena();
837 int transitive_interfaces_len = orig_length + (is_interface() ? 1 : 0);
838 GrowableArray<ciInstanceKlass*>* transitive_interfaces = new(arena)GrowableArray<ciInstanceKlass*>(arena, transitive_interfaces_len,
839 0, nullptr);
840 for (int i = 0; i < orig_length; i++) {
841 transitive_interfaces->append(CURRENT_ENV->get_instance_klass(interfaces->at(i)));
842 }
843 if (is_interface()) {
844 transitive_interfaces->append(this);
845 }
846 _transitive_interfaces = transitive_interfaces;
847 );
848 }
849
850 void ciInstanceKlass::dump_replay_data(outputStream* out) {
851 ResourceMark rm;
852
853 InstanceKlass* ik = get_instanceKlass();
854 ConstantPool* cp = ik->constants();
855
856 // Try to record related loaded classes
857 Klass* sub = ik->subklass();
858 while (sub != nullptr) {
859 if (sub->is_instance_klass()) {
860 InstanceKlass *isub = InstanceKlass::cast(sub);
861 dump_replay_instanceKlass(out, isub);
862 }
863 sub = sub->next_sibling();
864 }
865
866 // Dump out the state of the constant pool tags. During replay the
867 // tags will be validated for things which shouldn't change and
868 // classes will be resolved if the tags indicate that they were
869 // resolved at compile time.
870 const char *name = replay_name();
871 out->print("ciInstanceKlass %s %d %d %d", name,
872 is_linked(), is_initialized(), cp->length());
873 for (int index = 1; index < cp->length(); index++) {
874 out->print(" %d", cp->tags()->at(index));
875 }
876 out->cr();
877 if (is_initialized()) {
878 // Dump out the static final fields in case the compilation relies
879 // on their value for correct replay.
880 StaticFinalFieldPrinter sffp(out, name);
881 ik->do_local_static_fields(&sffp);
882 }
883 }
884
885 #ifdef ASSERT
886 bool ciInstanceKlass::debug_final_field_at(int offset) {
887 GUARDED_VM_ENTRY(
888 InstanceKlass* ik = get_instanceKlass();
889 fieldDescriptor fd;
890 if (ik->find_field_from_offset(offset, false, &fd)) {
891 return fd.is_final();
892 }
893 );
894 return false;
895 }
896
897 bool ciInstanceKlass::debug_stable_field_at(int offset) {
898 GUARDED_VM_ENTRY(
899 InstanceKlass* ik = get_instanceKlass();
900 fieldDescriptor fd;
901 if (ik->find_field_from_offset(offset, false, &fd)) {
902 return fd.is_stable();
903 }
904 );
905 return false;
906 }
907 #endif