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/ciInstance.hpp"
27 #include "ci/ciInstanceKlass.hpp"
28 #include "ci/ciUtilities.inline.hpp"
29 #include "classfile/javaClasses.hpp"
30 #include "classfile/vmClasses.hpp"
31 #include "memory/allocation.hpp"
32 #include "memory/allocation.inline.hpp"
33 #include "memory/resourceArea.hpp"
34 #include "oops/fieldStreams.inline.hpp"
35 #include "oops/instanceKlass.inline.hpp"
36 #include "oops/klass.inline.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "runtime/fieldDescriptor.inline.hpp"
39 #include "runtime/handles.inline.hpp"
40 #include "runtime/jniHandles.inline.hpp"
41
42 // ciInstanceKlass
43 //
44 // This class represents a Klass* in the HotSpot virtual machine
45 // whose Klass part in an InstanceKlass.
46
47
48 // ------------------------------------------------------------------
49 // ciInstanceKlass::ciInstanceKlass
50 //
51 // Loaded instance klass.
52 ciInstanceKlass::ciInstanceKlass(Klass* k) :
53 ciKlass(k)
54 {
55 assert(get_Klass()->is_instance_klass(), "wrong type");
56 assert(get_instanceKlass()->is_loaded(), "must be at least loaded");
57 InstanceKlass* ik = get_instanceKlass();
58
59 AccessFlags access_flags = ik->access_flags();
60 _flags = ciFlags(access_flags);
61 _has_finalizer = ik->has_finalizer();
62 _has_subklass = flags().is_final() ? subklass_false : subklass_unknown;
63 _init_state = ik->init_state();
64 _has_nonstatic_fields = ik->has_nonstatic_fields();
65 _has_nonstatic_concrete_methods = ik->has_nonstatic_concrete_methods();
66 _is_hidden = ik->is_hidden();
67 _is_record = ik->is_record();
68 _trust_final_fields = ik->trust_final_fields();
69 _nonstatic_fields = nullptr; // initialized lazily by compute_nonstatic_fields:
70 _has_injected_fields = -1;
71 _implementor = nullptr; // we will fill these lazily
72 _transitive_interfaces = nullptr;
73
74 // Ensure that the metadata wrapped by the ciMetadata is kept alive by GC.
75 // This is primarily useful for metadata which is considered as weak roots
76 // by the GC but need to be strong roots if reachable from a current compilation.
77 // InstanceKlass are created for both weak and strong metadata. Ensuring this metadata
78 // alive covers the cases where there are weak roots without performance cost.
79 oop holder = ik->klass_holder();
80 if (ik->class_loader_data()->has_class_mirror_holder()) {
81 // Though ciInstanceKlass records class loader oop, it's not enough to keep
82 // non-strong hidden classes alive (loader == nullptr). Klass holder should
83 // be used instead. It is enough to record a ciObject, since cached elements are never removed
84 // during ciObjectFactory lifetime. ciObjectFactory itself is created for
85 // every compilation and lives for the whole duration of the compilation.
86 assert(holder != nullptr, "holder of hidden class is the mirror which is never null");
87 (void)CURRENT_ENV->get_object(holder);
88 }
89
90 JavaThread *thread = JavaThread::current();
91 if (ciObjectFactory::is_initialized()) {
98 }
99
100 _has_trusted_loader = compute_has_trusted_loader();
101
102 // Lazy fields get filled in only upon request.
103 _super = nullptr;
104 _java_mirror = nullptr;
105
106 if (is_shared()) {
107 if (k != vmClasses::Object_klass()) {
108 super();
109 }
110 //compute_nonstatic_fields(); // done outside of constructor
111 }
112
113 _field_cache = nullptr;
114 }
115
116 // Version for unloaded classes:
117 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
118 jobject loader)
119 : ciKlass(name, T_OBJECT)
120 {
121 assert(name->char_at(0) != JVM_SIGNATURE_ARRAY, "not an instance klass");
122 _init_state = (InstanceKlass::ClassState)0;
123 _has_nonstatic_fields = false;
124 _nonstatic_fields = nullptr;
125 _has_injected_fields = -1;
126 _is_hidden = false;
127 _is_record = false;
128 _loader = loader;
129 _is_shared = false;
130 _super = nullptr;
131 _java_mirror = nullptr;
132 _field_cache = nullptr;
133 _has_trusted_loader = compute_has_trusted_loader();
134 }
135
136
137
138 // ------------------------------------------------------------------
139 // ciInstanceKlass::compute_shared_is_initialized
140 void ciInstanceKlass::compute_shared_init_state() {
141 GUARDED_VM_ENTRY(
142 InstanceKlass* ik = get_instanceKlass();
143 _init_state = ik->init_state();
144 )
302 if (name()->index_of_at(len+1, "/", 1) >= 0)
303 return false;
304
305 return true;
306 }
307
308 // ------------------------------------------------------------------
309 // ciInstanceKlass::print_impl
310 //
311 // Implementation of the print method.
312 void ciInstanceKlass::print_impl(outputStream* st) {
313 ciKlass::print_impl(st);
314 GUARDED_VM_ENTRY(st->print(" loader=" INTPTR_FORMAT, p2i(loader()));)
315 if (is_loaded()) {
316 st->print(" initialized=%s finalized=%s subklass=%s size=%d flags=",
317 bool_to_str(is_initialized()),
318 bool_to_str(has_finalizer()),
319 bool_to_str(has_subklass()),
320 layout_helper());
321
322 _flags.print_klass_flags();
323
324 if (_super) {
325 st->print(" super=");
326 _super->print_name();
327 }
328 if (_java_mirror) {
329 st->print(" mirror=PRESENT");
330 }
331 }
332 }
333
334 // ------------------------------------------------------------------
335 // ciInstanceKlass::super
336 //
337 // Get the superklass of this klass.
338 ciInstanceKlass* ciInstanceKlass::super() {
339 assert(is_loaded(), "must be loaded");
340 if (_super == nullptr && !is_java_lang_Object()) {
341 GUARDED_VM_ENTRY(
342 Klass* super_klass = get_instanceKlass()->super();
343 _super = CURRENT_ENV->get_instance_klass(super_klass);
344 )
345 }
346 return _super;
368 if (!is_abstract()) return nullptr; // Only applies to abstract classes.
369 if (!has_subklass()) return nullptr; // Must have at least one subklass.
370 VM_ENTRY_MARK;
371 InstanceKlass* ik = get_instanceKlass();
372 Klass* up = ik->up_cast_abstract();
373 assert(up->is_instance_klass(), "must be InstanceKlass");
374 if (ik == up) {
375 return nullptr;
376 }
377 return CURRENT_THREAD_ENV->get_instance_klass(up);
378 }
379
380 // ------------------------------------------------------------------
381 // ciInstanceKlass::has_finalizable_subclass
382 bool ciInstanceKlass::has_finalizable_subclass() {
383 if (!is_loaded()) return true;
384 VM_ENTRY_MARK;
385 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != nullptr;
386 }
387
388 // ------------------------------------------------------------------
389 // ciInstanceKlass::contains_field_offset
390 bool ciInstanceKlass::contains_field_offset(int offset) {
391 VM_ENTRY_MARK;
392 return get_instanceKlass()->contains_field_offset(offset);
393 }
394
395 ciField* ciInstanceKlass::get_nonstatic_field_by_offset(const int field_offset) {
396 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
397 ciField* field = _nonstatic_fields->at(i);
398 int field_off = field->offset_in_bytes();
399 if (field_off == field_offset)
400 return field;
401 }
402 return nullptr;
403 }
404
405 // ------------------------------------------------------------------
406 // ciInstanceKlass::get_field_by_offset
407 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
408 if (!is_static) {
409 return get_nonstatic_field_by_offset(field_offset);
410 }
411 VM_ENTRY_MARK;
412 InstanceKlass* k = get_instanceKlass();
413 fieldDescriptor fd;
414 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
415 return nullptr;
416 }
417 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
418 return field;
419 }
420
421 // ------------------------------------------------------------------
422 // ciInstanceKlass::get_field_by_name
423 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
424 VM_ENTRY_MARK;
425 InstanceKlass* k = get_instanceKlass();
426 fieldDescriptor fd;
427 Klass* def = k->find_field(name->get_symbol(), signature->get_symbol(), is_static, &fd);
428 if (def == nullptr) {
429 return nullptr;
430 }
431 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
432 return field;
433 }
434
435 // This is essentially a shortcut for:
436 // get_field_by_offset(field_offset, is_static)->layout_type()
437 // except this does not require allocating memory for a new ciField
438 BasicType ciInstanceKlass::get_field_type_by_offset(const int field_offset, const bool is_static) {
439 if (!is_static) {
440 ciField* field = get_nonstatic_field_by_offset(field_offset);
441 return field != nullptr ? field->layout_type() : T_ILLEGAL;
442 }
443
444 // Avoid allocating a new ciField by obtaining the field type directly
445 VM_ENTRY_MARK;
446 InstanceKlass* k = get_instanceKlass();
447 fieldDescriptor fd;
448 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
449 return T_ILLEGAL;
450 }
451
452 // Reproduce the behavior of ciField::layout_type
453 BasicType field_type = fd.field_type();
454 if (is_reference_type(field_type)) {
455 return T_OBJECT;
456 }
457 return type2field[make(field_type)->basic_type()];
458 }
459
460 // ------------------------------------------------------------------
461 // ciInstanceKlass::compute_nonstatic_fields
462 int ciInstanceKlass::compute_nonstatic_fields() {
463 assert(is_loaded(), "must be loaded");
464
465 if (_nonstatic_fields != nullptr)
466 return _nonstatic_fields->length();
467
468 if (!has_nonstatic_fields()) {
469 Arena* arena = CURRENT_ENV->arena();
470 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, nullptr);
471 return 0;
472 }
473 assert(!is_java_lang_Object(), "bootstrap OK");
474
475 ciInstanceKlass* super = this->super();
476 GrowableArray<ciField*>* super_fields = nullptr;
477 if (super != nullptr && super->has_nonstatic_fields()) {
478 int super_flen = super->nof_nonstatic_fields();
479 super_fields = super->_nonstatic_fields;
480 assert(super_flen == 0 || super_fields != nullptr, "first get nof_fields");
481 }
482
483 GrowableArray<ciField*>* fields = nullptr;
484 GUARDED_VM_ENTRY({
485 fields = compute_nonstatic_fields_impl(super_fields);
486 });
487
488 if (fields == nullptr) {
489 // This can happen if this class (java.lang.Class) has invisible fields.
490 if (super_fields != nullptr) {
491 _nonstatic_fields = super_fields;
492 return super_fields->length();
493 } else {
494 return 0;
495 }
496 }
497
498 int flen = fields->length();
499
500 _nonstatic_fields = fields;
501 return flen;
502 }
503
504 GrowableArray<ciField*>*
505 ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>*
506 super_fields) {
507 ASSERT_IN_VM;
508 Arena* arena = CURRENT_ENV->arena();
509 int flen = 0;
510 GrowableArray<ciField*>* fields = nullptr;
511 InstanceKlass* k = get_instanceKlass();
512 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
513 if (fs.access_flags().is_static()) continue;
514 flen += 1;
515 }
516
517 // allocate the array:
518 if (flen == 0) {
519 return nullptr; // return nothing if none are locally declared
520 }
521 if (super_fields != nullptr) {
522 flen += super_fields->length();
523 }
524 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, nullptr);
525 if (super_fields != nullptr) {
526 fields->appendAll(super_fields);
527 }
528
529 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
530 if (fs.access_flags().is_static()) continue;
531 fieldDescriptor& fd = fs.field_descriptor();
532 ciField* field = new (arena) ciField(&fd);
533 fields->append(field);
534 }
535 assert(fields->length() == flen, "sanity");
536 return fields;
537 }
538
539 bool ciInstanceKlass::compute_injected_fields_helper() {
540 ASSERT_IN_VM;
541 InstanceKlass* k = get_instanceKlass();
542
543 for (InternalFieldStream fs(k); !fs.done(); fs.next()) {
544 if (fs.access_flags().is_static()) continue;
545 return true;
546 }
547 return false;
548 }
549
550 void ciInstanceKlass::compute_injected_fields() {
551 assert(is_loaded(), "must be loaded");
552
553 int has_injected_fields = 0;
554 if (super() != nullptr && super()->has_injected_fields()) {
555 has_injected_fields = 1;
556 } else {
628 } else {
629 // Go into the VM to fetch the implementor.
630 VM_ENTRY_MARK;
631 InstanceKlass* ik = get_instanceKlass();
632 Klass* implk = ik->implementor();
633 if (implk != nullptr) {
634 if (implk == ik) {
635 // More than one implementors. Use 'this' in this case.
636 impl = this;
637 } else {
638 impl = CURRENT_THREAD_ENV->get_instance_klass(implk);
639 }
640 }
641 }
642 // Memoize this result.
643 _implementor = impl;
644 }
645 return impl;
646 }
647
648 // Utility class for printing of the contents of the static fields for
649 // use by compilation replay. It only prints out the information that
650 // could be consumed by the compiler, so for primitive types it prints
651 // out the actual value. For Strings it's the actual string value.
652 // For array types it it's first level array size since that's the
653 // only value which statically unchangeable. For all other reference
654 // types it simply prints out the dynamic type.
655
656 class StaticFinalFieldPrinter : public FieldClosure {
657 outputStream* _out;
658 const char* _holder;
659 public:
660 StaticFinalFieldPrinter(outputStream* out, const char* holder) :
661 _out(out),
662 _holder(holder) {
663 }
664 void do_field(fieldDescriptor* fd) {
665 if (fd->is_final() && !fd->has_initial_value()) {
666 ResourceMark rm;
667 oop mirror = fd->field_holder()->java_mirror();
668 _out->print("staticfield %s %s %s ", _holder, fd->name()->as_quoted_ascii(), fd->signature()->as_quoted_ascii());
669 BasicType field_type = fd->field_type();
670 switch (field_type) {
671 case T_BYTE: _out->print_cr("%d", mirror->byte_field(fd->offset())); break;
672 case T_BOOLEAN: _out->print_cr("%d", mirror->bool_field(fd->offset())); break;
673 case T_SHORT: _out->print_cr("%d", mirror->short_field(fd->offset())); break;
674 case T_CHAR: _out->print_cr("%d", mirror->char_field(fd->offset())); break;
675 case T_INT: _out->print_cr("%d", mirror->int_field(fd->offset())); break;
676 case T_LONG: _out->print_cr(INT64_FORMAT, (int64_t)(mirror->long_field(fd->offset()))); break;
677 case T_FLOAT: {
678 float f = mirror->float_field(fd->offset());
679 _out->print_cr("%d", *(int*)&f);
680 break;
681 }
682 case T_DOUBLE: {
683 double d = mirror->double_field(fd->offset());
684 _out->print_cr(INT64_FORMAT, *(int64_t*)&d);
685 break;
686 }
687 case T_ARRAY: // fall-through
688 case T_OBJECT: {
689 oop value = mirror->obj_field_acquire(fd->offset());
690 if (value == nullptr) {
691 if (field_type == T_ARRAY) {
692 _out->print("%d", -1);
693 }
694 _out->cr();
695 } else if (value->is_instance()) {
696 assert(field_type == T_OBJECT, "");
697 if (value->is_a(vmClasses::String_klass())) {
698 const char* ascii_value = java_lang_String::as_quoted_ascii(value);
699 _out->print_cr("\"%s\"", (ascii_value != nullptr) ? ascii_value : "");
700 } else {
701 const char* klass_name = value->klass()->name()->as_quoted_ascii();
702 _out->print_cr("%s", klass_name);
703 }
704 } else if (value->is_array()) {
705 typeArrayOop ta = (typeArrayOop)value;
706 _out->print("%d", ta->length());
707 if (value->is_objArray()) {
708 objArrayOop oa = (objArrayOop)value;
709 const char* klass_name = value->klass()->name()->as_quoted_ascii();
710 _out->print(" %s", klass_name);
711 }
712 _out->cr();
713 } else {
714 ShouldNotReachHere();
715 }
716 break;
717 }
718 default:
719 ShouldNotReachHere();
720 }
721 }
722 }
723 };
724
725 const char *ciInstanceKlass::replay_name() const {
726 return CURRENT_ENV->replay_name(get_instanceKlass());
727 }
728
729 void ciInstanceKlass::dump_replay_instanceKlass(outputStream* out, InstanceKlass* ik) {
730 if (ik->is_hidden()) {
731 const char *name = CURRENT_ENV->dyno_name(ik);
732 if (name != nullptr) {
733 out->print_cr("instanceKlass %s # %s", name, ik->name()->as_quoted_ascii());
734 } else {
735 out->print_cr("# instanceKlass %s", ik->name()->as_quoted_ascii());
736 }
737 } else {
738 out->print_cr("instanceKlass %s", ik->name()->as_quoted_ascii());
739 }
740 }
741
742 GrowableArray<ciInstanceKlass*>* ciInstanceKlass::transitive_interfaces() const{
743 if (_transitive_interfaces == nullptr) {
|
1 /*
2 * Copyright (c) 1999, 2026, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "ci/ciField.hpp"
26 #include "ci/ciInlineKlass.hpp"
27 #include "ci/ciInstance.hpp"
28 #include "ci/ciInstanceKlass.hpp"
29 #include "ci/ciUtilities.inline.hpp"
30 #include "classfile/javaClasses.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmClasses.hpp"
33 #include "memory/allocation.hpp"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/resourceArea.hpp"
36 #include "oops/fieldStreams.inline.hpp"
37 #include "oops/instanceKlass.inline.hpp"
38 #include "oops/klass.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "runtime/arguments.hpp"
41 #include "runtime/fieldDescriptor.inline.hpp"
42 #include "runtime/handles.inline.hpp"
43 #include "runtime/jniHandles.inline.hpp"
44
45 // ciInstanceKlass
46 //
47 // This class represents a Klass* in the HotSpot virtual machine
48 // whose Klass part in an InstanceKlass.
49
50
51 // ------------------------------------------------------------------
52 // ciInstanceKlass::ciInstanceKlass
53 //
54 // Loaded instance klass.
55 ciInstanceKlass::ciInstanceKlass(Klass* k) :
56 ciKlass(k)
57 {
58 assert(get_Klass()->is_instance_klass(), "wrong type");
59 assert(get_instanceKlass()->is_loaded(), "must be at least loaded");
60 InstanceKlass* ik = get_instanceKlass();
61
62 AccessFlags access_flags = ik->access_flags();
63 _flags = ciFlags(access_flags);
64 _has_finalizer = ik->has_finalizer();
65 _has_subklass = flags().is_final() ? subklass_false : subklass_unknown;
66 _init_state = ik->init_state();
67 _has_nonstatic_fields = ik->has_nonstatic_fields();
68 _has_nonstatic_concrete_methods = ik->has_nonstatic_concrete_methods();
69 _is_hidden = ik->is_hidden();
70 _is_record = ik->is_record();
71 _declared_nonstatic_fields = nullptr; // initialized lazily by compute_nonstatic_fields
72 _nonstatic_fields = nullptr; // initialized lazily by compute_nonstatic_fields
73 _trust_final_fields = ik->trust_final_fields();
74 _has_injected_fields = -1;
75 _implementor = nullptr; // we will fill these lazily
76 _transitive_interfaces = nullptr;
77
78 // Ensure that the metadata wrapped by the ciMetadata is kept alive by GC.
79 // This is primarily useful for metadata which is considered as weak roots
80 // by the GC but need to be strong roots if reachable from a current compilation.
81 // InstanceKlass are created for both weak and strong metadata. Ensuring this metadata
82 // alive covers the cases where there are weak roots without performance cost.
83 oop holder = ik->klass_holder();
84 if (ik->class_loader_data()->has_class_mirror_holder()) {
85 // Though ciInstanceKlass records class loader oop, it's not enough to keep
86 // non-strong hidden classes alive (loader == nullptr). Klass holder should
87 // be used instead. It is enough to record a ciObject, since cached elements are never removed
88 // during ciObjectFactory lifetime. ciObjectFactory itself is created for
89 // every compilation and lives for the whole duration of the compilation.
90 assert(holder != nullptr, "holder of hidden class is the mirror which is never null");
91 (void)CURRENT_ENV->get_object(holder);
92 }
93
94 JavaThread *thread = JavaThread::current();
95 if (ciObjectFactory::is_initialized()) {
102 }
103
104 _has_trusted_loader = compute_has_trusted_loader();
105
106 // Lazy fields get filled in only upon request.
107 _super = nullptr;
108 _java_mirror = nullptr;
109
110 if (is_shared()) {
111 if (k != vmClasses::Object_klass()) {
112 super();
113 }
114 //compute_nonstatic_fields(); // done outside of constructor
115 }
116
117 _field_cache = nullptr;
118 }
119
120 // Version for unloaded classes:
121 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
122 jobject loader,
123 BasicType bt)
124 : ciKlass(name, bt)
125 {
126 assert(name->char_at(0) != JVM_SIGNATURE_ARRAY, "not an instance klass");
127 _init_state = (InstanceKlass::ClassState)0;
128 _has_nonstatic_fields = false;
129 _declared_nonstatic_fields = nullptr; // initialized lazily by compute_nonstatic_fields
130 _nonstatic_fields = nullptr; // initialized lazily by compute_nonstatic_fields
131 _has_injected_fields = -1;
132 _is_hidden = false;
133 _is_record = false;
134 _loader = loader;
135 _is_shared = false;
136 _super = nullptr;
137 _java_mirror = nullptr;
138 _field_cache = nullptr;
139 _has_trusted_loader = compute_has_trusted_loader();
140 }
141
142
143
144 // ------------------------------------------------------------------
145 // ciInstanceKlass::compute_shared_is_initialized
146 void ciInstanceKlass::compute_shared_init_state() {
147 GUARDED_VM_ENTRY(
148 InstanceKlass* ik = get_instanceKlass();
149 _init_state = ik->init_state();
150 )
308 if (name()->index_of_at(len+1, "/", 1) >= 0)
309 return false;
310
311 return true;
312 }
313
314 // ------------------------------------------------------------------
315 // ciInstanceKlass::print_impl
316 //
317 // Implementation of the print method.
318 void ciInstanceKlass::print_impl(outputStream* st) {
319 ciKlass::print_impl(st);
320 GUARDED_VM_ENTRY(st->print(" loader=" INTPTR_FORMAT, p2i(loader()));)
321 if (is_loaded()) {
322 st->print(" initialized=%s finalized=%s subklass=%s size=%d flags=",
323 bool_to_str(is_initialized()),
324 bool_to_str(has_finalizer()),
325 bool_to_str(has_subklass()),
326 layout_helper());
327
328 _flags.print_klass_flags(st);
329
330 if (_super) {
331 st->print(" super=");
332 _super->print_name_on(st);
333 }
334 if (_java_mirror) {
335 st->print(" mirror=PRESENT");
336 }
337 }
338 }
339
340 // ------------------------------------------------------------------
341 // ciInstanceKlass::super
342 //
343 // Get the superklass of this klass.
344 ciInstanceKlass* ciInstanceKlass::super() {
345 assert(is_loaded(), "must be loaded");
346 if (_super == nullptr && !is_java_lang_Object()) {
347 GUARDED_VM_ENTRY(
348 Klass* super_klass = get_instanceKlass()->super();
349 _super = CURRENT_ENV->get_instance_klass(super_klass);
350 )
351 }
352 return _super;
374 if (!is_abstract()) return nullptr; // Only applies to abstract classes.
375 if (!has_subklass()) return nullptr; // Must have at least one subklass.
376 VM_ENTRY_MARK;
377 InstanceKlass* ik = get_instanceKlass();
378 Klass* up = ik->up_cast_abstract();
379 assert(up->is_instance_klass(), "must be InstanceKlass");
380 if (ik == up) {
381 return nullptr;
382 }
383 return CURRENT_THREAD_ENV->get_instance_klass(up);
384 }
385
386 // ------------------------------------------------------------------
387 // ciInstanceKlass::has_finalizable_subclass
388 bool ciInstanceKlass::has_finalizable_subclass() {
389 if (!is_loaded()) return true;
390 VM_ENTRY_MARK;
391 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != nullptr;
392 }
393
394 bool ciInstanceKlass::contains_field_offset(int offset) const {
395 VM_ENTRY_MARK;
396 return get_instanceKlass()->contains_field_offset(offset);
397 }
398
399 ciField* ciInstanceKlass::get_nonstatic_field_by_offset(const int field_offset) {
400 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
401 ciField* field = nonstatic_field_at(i);
402 int field_off = field->offset_in_bytes();
403 if (field_off == field_offset) {
404 return field;
405 }
406 }
407 return nullptr;
408 }
409
410 // ------------------------------------------------------------------
411 // ciInstanceKlass::get_field_by_offset
412 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
413 if (!is_static) {
414 return get_nonstatic_field_by_offset(field_offset);
415 }
416
417 VM_ENTRY_MARK;
418 InstanceKlass* k = get_instanceKlass();
419 fieldDescriptor fd;
420 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
421 return nullptr;
422 }
423 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
424 return field;
425 }
426
427 ciField* ciInstanceKlass::get_non_flat_field_by_offset(int field_offset) {
428 for (int i = 0, len = nof_declared_nonstatic_fields(); i < len; i++) {
429 ciField* field = declared_nonstatic_field_at(i);
430 int field_off = field->offset_in_bytes();
431 if (field_off == field_offset) {
432 return field;
433 }
434 }
435 return nullptr;
436 }
437
438 int ciInstanceKlass::field_index_by_offset(int offset) {
439 int best_offset = 0;
440 int best_index = -1;
441 // Search the field with the given offset
442 for (int i = 0; i < nof_declared_nonstatic_fields(); ++i) {
443 int field_offset = declared_nonstatic_field_at(i)->offset_in_bytes();
444 if (field_offset == offset) {
445 // Exact match
446 return i;
447 } else if (field_offset < offset && field_offset > best_offset) {
448 // No exact match. Save the index of the field with the closest offset that
449 // is smaller than the given field offset. This index corresponds to the
450 // flat field that holds the field we are looking for.
451 best_offset = field_offset;
452 best_index = i;
453 }
454 }
455 assert(best_index >= 0, "field not found");
456 assert(best_offset == offset || declared_nonstatic_field_at(best_index)->type()->is_inlinetype(), "offset should match for non-inline types");
457 return best_index;
458 }
459
460 // ------------------------------------------------------------------
461 // ciInstanceKlass::get_field_by_name
462 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
463 VM_ENTRY_MARK;
464 InstanceKlass* k = get_instanceKlass();
465 fieldDescriptor fd;
466 Klass* def = k->find_field(name->get_symbol(), signature->get_symbol(), is_static, &fd);
467 if (def == nullptr) {
468 return nullptr;
469 }
470 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
471 return field;
472 }
473
474 const GrowableArray<ciField*> empty_field_array(0, MemTag::mtCompiler);
475
476 // This is essentially a shortcut for:
477 // get_field_by_offset(field_offset, is_static)->layout_type()
478 // except this does not require allocating memory for a new ciField
479 BasicType ciInstanceKlass::get_field_type_by_offset(const int field_offset, const bool is_static) {
480 if (!is_static) {
481 ciField* field = get_nonstatic_field_by_offset(field_offset);
482 return field != nullptr ? field->layout_type() : T_ILLEGAL;
483 }
484
485 // Avoid allocating a new ciField by obtaining the field type directly
486 VM_ENTRY_MARK;
487 InstanceKlass* k = get_instanceKlass();
488 fieldDescriptor fd;
489 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
490 return T_ILLEGAL;
491 }
492
493 // Reproduce the behavior of ciField::layout_type
494 BasicType field_type = fd.field_type();
495 if (is_reference_type(field_type)) {
496 return T_OBJECT;
497 }
498 return type2field[make(field_type)->basic_type()];
499 }
500
501 void ciInstanceKlass::compute_nonstatic_fields() {
502 assert(is_loaded(), "must be loaded");
503
504 if (_nonstatic_fields != nullptr) {
505 assert(_declared_nonstatic_fields != nullptr, "must be initialized at the same time, class %s", name()->as_utf8());
506 return;
507 }
508
509 if (!has_nonstatic_fields()) {
510 _declared_nonstatic_fields = &empty_field_array;
511 _nonstatic_fields = &empty_field_array;
512 return;
513 }
514 assert(!is_java_lang_Object(), "bootstrap OK");
515
516 ciInstanceKlass* super = this->super();
517 assert(super != nullptr, "must have a super class, current class: %s", name()->as_utf8());
518 super->compute_nonstatic_fields();
519 const GrowableArray<ciField*>* super_declared_fields = super->_declared_nonstatic_fields;;
520 const GrowableArray<ciField*>* super_fields = super->_nonstatic_fields;
521 assert(super_declared_fields != nullptr && super_fields != nullptr, "must have been initialized, current class: %s, super class: %s", name()->as_utf8(), super->name()->as_utf8());
522
523 GUARDED_VM_ENTRY({
524 compute_nonstatic_fields_impl(super_declared_fields, super_fields);
525 });
526 }
527
528 void ciInstanceKlass::compute_nonstatic_fields_impl(const GrowableArray<ciField*>* super_declared_fields, const GrowableArray<ciField*>* super_fields) {
529 assert(_declared_nonstatic_fields == nullptr && _nonstatic_fields == nullptr, "initialized already");
530 ASSERT_IN_VM;
531 Arena* arena = CURRENT_ENV->arena();
532
533 InstanceKlass* this_klass = get_instanceKlass();
534 int declared_field_num = 0;
535 int field_num = 0;
536 for (JavaFieldStream fs(this_klass); !fs.done(); fs.next()) {
537 if (fs.access_flags().is_static()) {
538 continue;
539 }
540
541 declared_field_num++;
542
543 fieldDescriptor& fd = fs.field_descriptor();
544 if (fd.is_flat()) {
545 InlineKlass* k = this_klass->get_inline_type_field_klass(fd.index());
546 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass();
547 field_num += vk->nof_nonstatic_fields();
548 field_num += fd.has_null_marker() ? 1 : 0;
549 } else {
550 field_num++;
551 }
552 }
553
554 GrowableArray<ciField*>* tmp_declared_fields = nullptr;
555 if (declared_field_num != 0) {
556 tmp_declared_fields = new (arena) GrowableArray<ciField*>(arena, declared_field_num + super_declared_fields->length(), 0, nullptr);
557 tmp_declared_fields->appendAll(super_declared_fields);
558 }
559
560 GrowableArray<ciField*>* tmp_fields = nullptr;
561 if (field_num != 0) {
562 tmp_fields = new (arena) GrowableArray<ciField*>(arena, field_num + super_fields->length(), 0, nullptr);
563 tmp_fields->appendAll(super_fields);
564 }
565
566 // For later assertion
567 declared_field_num += super_declared_fields->length();
568 field_num += super_fields->length();
569
570 for (JavaFieldStream fs(this_klass); !fs.done(); fs.next()) {
571 if (fs.access_flags().is_static()) {
572 continue;
573 }
574
575 fieldDescriptor& fd = fs.field_descriptor();
576 ciField* declared_field = new (arena) ciField(&fd);
577 assert(tmp_declared_fields != nullptr, "should be initialized");
578 tmp_declared_fields->append(declared_field);
579
580 if (fd.is_flat()) {
581 // Flat fields are embedded
582 Klass* k = get_instanceKlass()->get_inline_type_field_klass(fd.index());
583 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass();
584 // Iterate over fields of the flat inline type and copy them to 'this'
585 for (int i = 0; i < vk->nof_nonstatic_fields(); ++i) {
586 assert(tmp_fields != nullptr, "should be initialized");
587 tmp_fields->append(new (arena) ciField(declared_field, vk->nonstatic_field_at(i)));
588 }
589 if (fd.has_null_marker()) {
590 assert(tmp_fields != nullptr, "should be initialized");
591 tmp_fields->append(new (arena) ciField(declared_field));
592 }
593 } else {
594 assert(tmp_fields != nullptr, "should be initialized");
595 tmp_fields->append(declared_field);
596 }
597 }
598
599 // Now sort them by offset, ascending. In principle, they could mix with superclass fields.
600 if (tmp_declared_fields != nullptr) {
601 assert(tmp_declared_fields->length() == declared_field_num, "sanity check failed for class: %s, number of declared fields: %d, expected: %d",
602 name()->as_utf8(), tmp_declared_fields->length(), declared_field_num);
603 _declared_nonstatic_fields = tmp_declared_fields;
604 } else {
605 _declared_nonstatic_fields = super_declared_fields;
606 }
607
608 if (tmp_fields != nullptr) {
609 assert(tmp_fields->length() == field_num, "sanity check failed for class: %s, number of fields: %d, expected: %d",
610 name()->as_utf8(), tmp_fields->length(), field_num);
611 _nonstatic_fields = tmp_fields;
612 } else {
613 _nonstatic_fields = super_fields;
614 }
615 }
616
617 bool ciInstanceKlass::compute_injected_fields_helper() {
618 ASSERT_IN_VM;
619 InstanceKlass* k = get_instanceKlass();
620
621 for (InternalFieldStream fs(k); !fs.done(); fs.next()) {
622 if (fs.access_flags().is_static()) continue;
623 return true;
624 }
625 return false;
626 }
627
628 void ciInstanceKlass::compute_injected_fields() {
629 assert(is_loaded(), "must be loaded");
630
631 int has_injected_fields = 0;
632 if (super() != nullptr && super()->has_injected_fields()) {
633 has_injected_fields = 1;
634 } else {
706 } else {
707 // Go into the VM to fetch the implementor.
708 VM_ENTRY_MARK;
709 InstanceKlass* ik = get_instanceKlass();
710 Klass* implk = ik->implementor();
711 if (implk != nullptr) {
712 if (implk == ik) {
713 // More than one implementors. Use 'this' in this case.
714 impl = this;
715 } else {
716 impl = CURRENT_THREAD_ENV->get_instance_klass(implk);
717 }
718 }
719 }
720 // Memoize this result.
721 _implementor = impl;
722 }
723 return impl;
724 }
725
726 bool ciInstanceKlass::can_be_inline_klass(bool is_exact) {
727 if (!Arguments::is_valhalla_enabled()) {
728 return false;
729 }
730 if (!is_loaded() || is_inlinetype()) {
731 // Not loaded or known to be an inline klass
732 return true;
733 }
734 if (!is_exact) {
735 // Not exact, check if this is a valid super for an inline klass
736 GUARDED_VM_ENTRY(
737 return !get_instanceKlass()->access_flags().is_identity_class() || is_java_lang_Object();
738 )
739 }
740 return false;
741 }
742
743 // Utility class for printing of the contents of the static fields for
744 // use by compilation replay. It only prints out the information that
745 // could be consumed by the compiler, so for primitive types it prints
746 // out the actual value. For Strings it's the actual string value.
747 // For array types it it's first level array size since that's the
748 // only value which statically unchangeable. For all other reference
749 // types it simply prints out the dynamic type.
750
751 class StaticFieldPrinter : public FieldClosure {
752 protected:
753 outputStream* _out;
754 public:
755 StaticFieldPrinter(outputStream* out) :
756 _out(out) {
757 }
758 void do_field_helper(fieldDescriptor* fd, oop obj, bool is_flat);
759 };
760
761 class StaticFinalFieldPrinter : public StaticFieldPrinter {
762 const char* _holder;
763 public:
764 StaticFinalFieldPrinter(outputStream* out, const char* holder) :
765 StaticFieldPrinter(out), _holder(holder) {
766 }
767 void do_field(fieldDescriptor* fd) {
768 if (fd->is_final() && !fd->has_initial_value()) {
769 ResourceMark rm;
770 InstanceKlass* holder = fd->field_holder();
771 oop mirror = holder->java_mirror();
772 _out->print("staticfield %s %s ", _holder, fd->name()->as_quoted_ascii());
773 BasicType bt = fd->field_type();
774 if (bt != T_OBJECT && bt != T_ARRAY) {
775 _out->print("%s ", fd->signature()->as_quoted_ascii());
776 }
777 do_field_helper(fd, mirror, false);
778 _out->cr();
779 }
780 }
781 };
782
783 class InlineTypeFieldPrinter : public StaticFieldPrinter {
784 oop _obj;
785 public:
786 InlineTypeFieldPrinter(outputStream* out, oop obj) :
787 StaticFieldPrinter(out), _obj(obj) {
788 }
789 void do_field(fieldDescriptor* fd) {
790 do_field_helper(fd, _obj, true);
791 _out->print(" ");
792 }
793 };
794
795 void StaticFieldPrinter::do_field_helper(fieldDescriptor* fd, oop mirror, bool is_flat) {
796 BasicType field_type = fd->field_type();
797 switch (field_type) {
798 case T_BYTE: _out->print("%d", mirror->byte_field(fd->offset())); break;
799 case T_BOOLEAN: _out->print("%d", mirror->bool_field(fd->offset())); break;
800 case T_SHORT: _out->print("%d", mirror->short_field(fd->offset())); break;
801 case T_CHAR: _out->print("%d", mirror->char_field(fd->offset())); break;
802 case T_INT: _out->print("%d", mirror->int_field(fd->offset())); break;
803 case T_LONG: _out->print(INT64_FORMAT, (int64_t)(mirror->long_field(fd->offset()))); break;
804 case T_FLOAT: {
805 float f = mirror->float_field(fd->offset());
806 _out->print("%d", *(int*)&f);
807 break;
808 }
809 case T_DOUBLE: {
810 double d = mirror->double_field(fd->offset());
811 _out->print(INT64_FORMAT, *(int64_t*)&d);
812 break;
813 }
814 case T_ARRAY: // fall-through
815 case T_OBJECT:
816 if (!fd->is_null_free_inline_type()) {
817 _out->print("%s ", fd->signature()->as_quoted_ascii());
818 oop value = mirror->obj_field_acquire(fd->offset());
819 if (value == nullptr) {
820 if (field_type == T_ARRAY) {
821 _out->print("%d", -1);
822 }
823 _out->cr();
824 } else if (value->is_instance()) {
825 assert(field_type == T_OBJECT, "");
826 if (value->is_a(vmClasses::String_klass())) {
827 const char* ascii_value = java_lang_String::as_quoted_ascii(value);
828 _out->print("\"%s\"", (ascii_value != nullptr) ? ascii_value : "");
829 } else {
830 const char* klass_name = value->klass()->name()->as_quoted_ascii();
831 _out->print("%s", klass_name);
832 }
833 } else if (value->is_array()) {
834 arrayOop a = (arrayOop)value;
835 _out->print("%d", a->length());
836 if (value->is_objArray()) {
837 objArrayOop oa = (objArrayOop)value;
838 const char* klass_name = value->klass()->name()->as_quoted_ascii();
839 _out->print(" %s", klass_name);
840 }
841 } else {
842 ShouldNotReachHere();
843 }
844 break;
845 } else {
846 // handling of null free inline type
847 ResetNoHandleMark rnhm;
848 Thread* THREAD = Thread::current();
849 SignatureStream ss(fd->signature(), false);
850 Symbol* name = ss.as_symbol();
851 assert(!HAS_PENDING_EXCEPTION, "can resolve klass?");
852 InstanceKlass* holder = fd->field_holder();
853 InstanceKlass* k = SystemDictionary::find_instance_klass(THREAD, name,
854 Handle(THREAD, holder->class_loader()));
855 guarantee(k != nullptr && !HAS_PENDING_EXCEPTION, "can resolve klass?");
856 InlineKlass* vk = InlineKlass::cast(k);
857 oop obj;
858 if (is_flat) {
859 int field_offset = fd->offset() - vk->payload_offset();
860 obj = cast_to_oop(cast_from_oop<address>(mirror) + field_offset);
861 } else {
862 obj = mirror->obj_field_acquire(fd->offset());
863 }
864 InlineTypeFieldPrinter print_field(_out, obj);
865 vk->do_nonstatic_fields(&print_field);
866 break;
867 }
868 default:
869 ShouldNotReachHere();
870 }
871 }
872
873 const char *ciInstanceKlass::replay_name() const {
874 return CURRENT_ENV->replay_name(get_instanceKlass());
875 }
876
877 void ciInstanceKlass::dump_replay_instanceKlass(outputStream* out, InstanceKlass* ik) {
878 if (ik->is_hidden()) {
879 const char *name = CURRENT_ENV->dyno_name(ik);
880 if (name != nullptr) {
881 out->print_cr("instanceKlass %s # %s", name, ik->name()->as_quoted_ascii());
882 } else {
883 out->print_cr("# instanceKlass %s", ik->name()->as_quoted_ascii());
884 }
885 } else {
886 out->print_cr("instanceKlass %s", ik->name()->as_quoted_ascii());
887 }
888 }
889
890 GrowableArray<ciInstanceKlass*>* ciInstanceKlass::transitive_interfaces() const{
891 if (_transitive_interfaces == nullptr) {
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