1 /*
2 * Copyright (c) 1999, 2021, 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 = access_flags.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 = NULL; // initialized lazily by compute_nonstatic_fields:
73 _has_injected_fields = -1;
74 _implementor = NULL; // we will fill these lazily
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 == NULL). 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 != NULL, "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 _protection_domain = JNIHandles::make_local(thread,
96 ik->protection_domain());
97 _is_shared = false;
98 } else {
99 Handle h_loader(thread, ik->class_loader());
100 Handle h_protection_domain(thread, ik->protection_domain());
101 _loader = JNIHandles::make_global(h_loader);
102 _protection_domain = JNIHandles::make_global(h_protection_domain);
103 _is_shared = true;
104 }
105
106 // Lazy fields get filled in only upon request.
107 _super = NULL;
108 _java_mirror = NULL;
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 = NULL;
118 }
119
120 // Version for unloaded classes:
121 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
122 jobject loader, jobject protection_domain,
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 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields
130 _has_injected_fields = -1;
131 _is_hidden = false;
132 _is_record = false;
133 _loader = loader;
134 _protection_domain = protection_domain;
135 _is_shared = false;
136 _super = NULL;
137 _java_mirror = NULL;
138 _field_cache = NULL;
139 }
140
141
142
143 // ------------------------------------------------------------------
144 // ciInstanceKlass::compute_shared_is_initialized
145 void ciInstanceKlass::compute_shared_init_state() {
146 GUARDED_VM_ENTRY(
147 InstanceKlass* ik = get_instanceKlass();
148 _init_state = ik->init_state();
149 )
150 }
151
152 // ------------------------------------------------------------------
153 // ciInstanceKlass::compute_shared_has_subklass
154 bool ciInstanceKlass::compute_shared_has_subklass() {
155 GUARDED_VM_ENTRY(
156 InstanceKlass* ik = get_instanceKlass();
157 _has_subklass = ik->subklass() != NULL ? subklass_true : subklass_false;
158 return _has_subklass == subklass_true;
159 )
160 }
161
162 // ------------------------------------------------------------------
163 // ciInstanceKlass::loader
164 oop ciInstanceKlass::loader() {
165 ASSERT_IN_VM;
166 return JNIHandles::resolve(_loader);
167 }
168
169 // ------------------------------------------------------------------
170 // ciInstanceKlass::loader_handle
171 jobject ciInstanceKlass::loader_handle() {
172 return _loader;
173 }
174
175 // ------------------------------------------------------------------
176 // ciInstanceKlass::protection_domain
177 oop ciInstanceKlass::protection_domain() {
178 ASSERT_IN_VM;
179 return JNIHandles::resolve(_protection_domain);
180 }
181
182 // ------------------------------------------------------------------
183 // ciInstanceKlass::protection_domain_handle
184 jobject ciInstanceKlass::protection_domain_handle() {
185 return _protection_domain;
186 }
187
188 // ------------------------------------------------------------------
189 // ciInstanceKlass::field_cache
190 //
191 // Get the field cache associated with this klass.
192 ciConstantPoolCache* ciInstanceKlass::field_cache() {
193 if (is_shared()) {
194 return NULL;
195 }
196 if (_field_cache == NULL) {
197 assert(!is_java_lang_Object(), "Object has no fields");
198 Arena* arena = CURRENT_ENV->arena();
199 _field_cache = new (arena) ciConstantPoolCache(arena, 5);
200 }
201 return _field_cache;
202 }
203
204 // ------------------------------------------------------------------
205 // ciInstanceKlass::get_canonical_holder
206 //
207 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
208 #ifdef ASSERT
209 if (!(offset >= 0 && offset < layout_helper_size_in_bytes())) {
210 tty->print("*** get_canonical_holder(%d) on ", offset);
211 this->print();
212 tty->print_cr(" ***");
213 };
214 assert(offset >= 0 && offset < layout_helper_size_in_bytes(), "offset must be tame");
215 #endif
216
217 if (offset < instanceOopDesc::base_offset_in_bytes()) {
218 // All header offsets belong properly to java/lang/Object.
219 return CURRENT_ENV->Object_klass();
220 }
221
222 ciInstanceKlass* self = this;
223 assert(self->is_loaded(), "must be loaded to access field info");
224 ciField* field = self->get_field_by_offset(offset, false);
225 if (field != NULL) {
226 return field->holder();
227 } else {
228 for (;;) {
229 assert(self->is_loaded(), "must be loaded to have size");
230 ciInstanceKlass* super = self->super();
231 if (super == NULL ||
232 super->nof_nonstatic_fields() == 0 ||
233 super->layout_helper_size_in_bytes() <= offset) {
234 return self;
235 } else {
236 self = super; // return super->get_canonical_holder(offset)
237 }
238 }
239 }
240 }
241
242 // ------------------------------------------------------------------
243 // ciInstanceKlass::is_java_lang_Object
244 //
245 // Is this klass java.lang.Object?
246 bool ciInstanceKlass::is_java_lang_Object() const {
247 return equals(CURRENT_ENV->Object_klass());
248 }
249
250 // ------------------------------------------------------------------
251 // ciInstanceKlass::uses_default_loader
252 bool ciInstanceKlass::uses_default_loader() const {
253 // Note: We do not need to resolve the handle or enter the VM
254 // in order to test null-ness.
255 return _loader == NULL;
256 }
257
258 // ------------------------------------------------------------------
259
260 /**
261 * Return basic type of boxed value for box klass or T_OBJECT if not.
262 */
263 BasicType ciInstanceKlass::box_klass_type() const {
264 if (uses_default_loader() && is_loaded()) {
265 return vmClasses::box_klass_type(get_Klass());
266 } else {
267 return T_OBJECT;
268 }
269 }
270
271 /**
272 * Is this boxing klass?
273 */
274 bool ciInstanceKlass::is_box_klass() const {
275 return is_java_primitive(box_klass_type());
276 }
277
278 /**
279 * Is this boxed value offset?
280 */
281 bool ciInstanceKlass::is_boxed_value_offset(int offset) const {
282 BasicType bt = box_klass_type();
283 return is_java_primitive(bt) &&
284 (offset == java_lang_boxing_object::value_offset(bt));
285 }
286
287 static bool is_klass_initialized(Symbol* klass_name) {
288 VM_ENTRY_MARK;
289 InstanceKlass* ik = SystemDictionary::find_instance_klass(klass_name, Handle(), Handle());
290 return ik != nullptr && ik->is_initialized();
291 }
292
293 bool ciInstanceKlass::is_box_cache_valid() const {
294 BasicType box_type = box_klass_type();
295
296 if (box_type != T_OBJECT) {
297 switch(box_type) {
298 case T_INT: return is_klass_initialized(java_lang_Integer_IntegerCache::symbol());
299 case T_CHAR: return is_klass_initialized(java_lang_Character_CharacterCache::symbol());
300 case T_SHORT: return is_klass_initialized(java_lang_Short_ShortCache::symbol());
301 case T_BYTE: return is_klass_initialized(java_lang_Byte_ByteCache::symbol());
302 case T_LONG: return is_klass_initialized(java_lang_Long_LongCache::symbol());
303 case T_BOOLEAN:
304 case T_FLOAT:
305 case T_DOUBLE: return true;
306 default:;
307 }
308 }
309 return false;
310 }
311
312 // ------------------------------------------------------------------
313 // ciInstanceKlass::is_in_package
314 //
315 // Is this klass in the given package?
316 bool ciInstanceKlass::is_in_package(const char* packagename, int len) {
317 // To avoid class loader mischief, this test always rejects application classes.
318 if (!uses_default_loader())
319 return false;
320 GUARDED_VM_ENTRY(
321 return is_in_package_impl(packagename, len);
322 )
323 }
324
325 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) {
326 ASSERT_IN_VM;
327
328 // If packagename contains trailing '/' exclude it from the
329 // prefix-test since we test for it explicitly.
330 if (packagename[len - 1] == '/')
331 len--;
332
333 if (!name()->starts_with(packagename, len))
334 return false;
335
336 // Test if the class name is something like "java/lang".
337 if ((len + 1) > name()->utf8_length())
338 return false;
339
340 // Test for trailing '/'
341 if (name()->char_at(len) != '/')
342 return false;
343
344 // Make sure it's not actually in a subpackage:
345 if (name()->index_of_at(len+1, "/", 1) >= 0)
346 return false;
347
348 return true;
349 }
350
351 // ------------------------------------------------------------------
352 // ciInstanceKlass::print_impl
353 //
354 // Implementation of the print method.
355 void ciInstanceKlass::print_impl(outputStream* st) {
356 ciKlass::print_impl(st);
357 GUARDED_VM_ENTRY(st->print(" loader=" INTPTR_FORMAT, p2i(loader()));)
358 if (is_loaded()) {
359 st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=",
360 bool_to_str(is_initialized()),
361 bool_to_str(has_finalizer()),
362 bool_to_str(has_subklass()),
363 layout_helper());
364
365 _flags.print_klass_flags(st);
366
367 if (_super) {
368 st->print(" super=");
369 _super->print_name_on(st);
370 }
371 if (_java_mirror) {
372 st->print(" mirror=PRESENT");
373 }
374 } else {
375 st->print(" loaded=false");
376 }
377 }
378
379 // ------------------------------------------------------------------
380 // ciInstanceKlass::super
381 //
382 // Get the superklass of this klass.
383 ciInstanceKlass* ciInstanceKlass::super() {
384 assert(is_loaded(), "must be loaded");
385 if (_super == NULL && !is_java_lang_Object()) {
386 GUARDED_VM_ENTRY(
387 Klass* super_klass = get_instanceKlass()->super();
388 _super = CURRENT_ENV->get_instance_klass(super_klass);
389 )
390 }
391 return _super;
392 }
393
394 // ------------------------------------------------------------------
395 // ciInstanceKlass::java_mirror
396 //
397 // Get the instance of java.lang.Class corresponding to this klass.
398 // Cache it on this->_java_mirror.
399 ciInstance* ciInstanceKlass::java_mirror() {
400 if (is_shared()) {
401 return ciKlass::java_mirror();
402 }
403 if (_java_mirror == NULL) {
404 _java_mirror = ciKlass::java_mirror();
405 }
406 return _java_mirror;
407 }
408
409 // ------------------------------------------------------------------
410 // ciInstanceKlass::unique_concrete_subklass
411 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
412 if (!is_loaded()) return NULL; // No change if class is not loaded
413 if (!is_abstract()) return NULL; // Only applies to abstract classes.
414 if (!has_subklass()) return NULL; // Must have at least one subklass.
415 VM_ENTRY_MARK;
416 InstanceKlass* ik = get_instanceKlass();
417 Klass* up = ik->up_cast_abstract();
418 assert(up->is_instance_klass(), "must be InstanceKlass");
419 if (ik == up) {
420 return NULL;
421 }
422 return CURRENT_THREAD_ENV->get_instance_klass(up);
423 }
424
425 // ------------------------------------------------------------------
426 // ciInstanceKlass::has_finalizable_subclass
427 bool ciInstanceKlass::has_finalizable_subclass() {
428 if (!is_loaded()) return true;
429 VM_ENTRY_MARK;
430 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL;
431 }
432
433 // ------------------------------------------------------------------
434 // ciInstanceKlass::contains_field_offset
435 bool ciInstanceKlass::contains_field_offset(int offset) {
436 VM_ENTRY_MARK;
437 return get_instanceKlass()->contains_field_offset(offset);
438 }
439
440 // ------------------------------------------------------------------
441 // ciInstanceKlass::get_field_by_offset
442 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
443 if (!is_static) {
444 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
445 ciField* field = _nonstatic_fields->at(i);
446 int field_off = field->offset_in_bytes();
447 if (field_off == field_offset)
448 return field;
449 if (field_off > field_offset)
450 break;
451 // could do binary search or check bins, but probably not worth it
452 }
453 return NULL;
454 }
455 VM_ENTRY_MARK;
456 InstanceKlass* k = get_instanceKlass();
457 fieldDescriptor fd;
458 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
459 return NULL;
460 }
461 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
462 return field;
463 }
464
465 ciField* ciInstanceKlass::get_non_flattened_field_by_offset(int field_offset) {
466 if (super() != NULL && super()->has_nonstatic_fields()) {
467 ciField* f = super()->get_non_flattened_field_by_offset(field_offset);
468 if (f != NULL) {
469 return f;
470 }
471 }
472
473 VM_ENTRY_MARK;
474 InstanceKlass* k = get_instanceKlass();
475 Arena* arena = CURRENT_ENV->arena();
476 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
477 if (fs.access_flags().is_static()) continue;
478 fieldDescriptor& fd = fs.field_descriptor();
479 if (fd.offset() == field_offset) {
480 ciField* f = new (arena) ciField(&fd);
481 return f;
482 }
483 }
484
485 return NULL;
486 }
487
488 // ------------------------------------------------------------------
489 // ciInstanceKlass::get_field_by_name
490 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
491 VM_ENTRY_MARK;
492 InstanceKlass* k = get_instanceKlass();
493 fieldDescriptor fd;
494 Klass* def = k->find_field(name->get_symbol(), signature->get_symbol(), is_static, &fd);
495 if (def == NULL) {
496 return NULL;
497 }
498 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
499 return field;
500 }
501
502
503 static int sort_field_by_offset(ciField** a, ciField** b) {
504 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
505 // (no worries about 32-bit overflow...)
506 }
507
508 // ------------------------------------------------------------------
509 // ciInstanceKlass::compute_nonstatic_fields
510 int ciInstanceKlass::compute_nonstatic_fields() {
511 assert(is_loaded(), "must be loaded");
512
513 if (_nonstatic_fields != NULL)
514 return _nonstatic_fields->length();
515
516 if (!has_nonstatic_fields()) {
517 Arena* arena = CURRENT_ENV->arena();
518 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL);
519 return 0;
520 }
521 assert(!is_java_lang_Object(), "bootstrap OK");
522
523 ciInstanceKlass* super = this->super();
524 GrowableArray<ciField*>* super_fields = NULL;
525 if (super != NULL && super->has_nonstatic_fields()) {
526 int super_flen = super->nof_nonstatic_fields();
527 super_fields = super->_nonstatic_fields;
528 assert(super_flen == 0 || super_fields != NULL, "first get nof_fields");
529 }
530
531 GrowableArray<ciField*>* fields = NULL;
532 GUARDED_VM_ENTRY({
533 fields = compute_nonstatic_fields_impl(super_fields);
534 });
535
536 if (fields == NULL) {
537 // This can happen if this class (java.lang.Class) has invisible fields.
538 if (super_fields != NULL) {
539 _nonstatic_fields = super_fields;
540 return super_fields->length();
541 } else {
542 return 0;
543 }
544 }
545
546 _nonstatic_fields = fields;
547 return fields->length();
548 }
549
550 GrowableArray<ciField*>* ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields, bool flatten) {
551 ASSERT_IN_VM;
552 Arena* arena = CURRENT_ENV->arena();
553 int flen = 0;
554 GrowableArray<ciField*>* fields = NULL;
555 InstanceKlass* k = get_instanceKlass();
556 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
557 if (fs.access_flags().is_static()) continue;
558 flen += 1;
559 }
560
561 // allocate the array:
562 if (flen == 0) {
563 return NULL; // return nothing if none are locally declared
564 }
565 if (super_fields != NULL) {
566 flen += super_fields->length();
567 }
568
569 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL);
570 if (super_fields != NULL) {
571 fields->appendAll(super_fields);
572 }
573
574 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
575 if (fs.access_flags().is_static()) continue;
576 fieldDescriptor& fd = fs.field_descriptor();
577 if (fd.is_inlined() && flatten) {
578 // Inline type fields are embedded
579 int field_offset = fd.offset();
580 // Get InlineKlass and adjust number of fields
581 Klass* k = get_instanceKlass()->get_inline_type_field_klass(fd.index());
582 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass();
583 flen += vk->nof_nonstatic_fields() - 1;
584 // Iterate over fields of the flattened inline type and copy them to 'this'
585 for (int i = 0; i < vk->nof_nonstatic_fields(); ++i) {
586 ciField* flattened_field = vk->nonstatic_field_at(i);
587 // Adjust offset to account for missing oop header
588 int offset = field_offset + (flattened_field->offset() - vk->first_field_offset());
589 // A flattened field can be treated as final if the non-flattened
590 // field is declared final or the holder klass is an inline type itself.
591 bool is_final = fd.is_final() || is_inlinetype();
592 ciField* field = new (arena) ciField(flattened_field, this, offset, is_final);
593 fields->append(field);
594 }
595 } else {
596 ciField* field = new (arena) ciField(&fd);
597 fields->append(field);
598 }
599 }
600 assert(fields->length() == flen, "sanity");
601 // Now sort them by offset, ascending.
602 // (In principle, they could mix with superclass fields.)
603 fields->sort(sort_field_by_offset);
604 return fields;
605 }
606
607 bool ciInstanceKlass::compute_injected_fields_helper() {
608 ASSERT_IN_VM;
609 InstanceKlass* k = get_instanceKlass();
610
611 for (InternalFieldStream fs(k); !fs.done(); fs.next()) {
612 if (fs.access_flags().is_static()) continue;
613 return true;
614 }
615 return false;
616 }
617
618 void ciInstanceKlass::compute_injected_fields() {
619 assert(is_loaded(), "must be loaded");
620
621 int has_injected_fields = 0;
622 if (super() != NULL && super()->has_injected_fields()) {
623 has_injected_fields = 1;
624 } else {
625 GUARDED_VM_ENTRY({
626 has_injected_fields = compute_injected_fields_helper() ? 1 : 0;
627 });
628 }
629 // may be concurrently initialized for shared ciInstanceKlass objects
630 assert(_has_injected_fields == -1 || _has_injected_fields == has_injected_fields, "broken concurrent initialization");
631 _has_injected_fields = has_injected_fields;
632 }
633
634 bool ciInstanceKlass::has_object_fields() const {
635 GUARDED_VM_ENTRY(
636 return get_instanceKlass()->nonstatic_oop_map_size() > 0;
637 );
638 }
639
640 // ------------------------------------------------------------------
641 // ciInstanceKlass::find_method
642 //
643 // Find a method in this klass.
644 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
645 VM_ENTRY_MARK;
646 InstanceKlass* k = get_instanceKlass();
647 Symbol* name_sym = name->get_symbol();
648 Symbol* sig_sym= signature->get_symbol();
649
650 Method* m = k->find_method(name_sym, sig_sym);
651 if (m == NULL) return NULL;
652
653 return CURRENT_THREAD_ENV->get_method(m);
654 }
655
656 // ------------------------------------------------------------------
657 // ciInstanceKlass::is_leaf_type
658 bool ciInstanceKlass::is_leaf_type() {
659 assert(is_loaded(), "must be loaded");
660 if (is_shared()) {
661 return is_final(); // approximately correct
662 } else {
663 return !has_subklass() && (nof_implementors() == 0);
664 }
665 }
666
667 // ------------------------------------------------------------------
668 // ciInstanceKlass::implementor
669 //
670 // Report an implementor of this interface.
671 // Note that there are various races here, since my copy
672 // of _nof_implementors might be out of date with respect
673 // to results returned by InstanceKlass::implementor.
674 // This is OK, since any dependencies we decide to assert
675 // will be checked later under the Compile_lock.
676 ciInstanceKlass* ciInstanceKlass::implementor() {
677 ciInstanceKlass* impl = _implementor;
678 if (impl == NULL) {
679 // Go into the VM to fetch the implementor.
680 {
681 VM_ENTRY_MARK;
682 MutexLocker ml(Compile_lock);
683 Klass* k = get_instanceKlass()->implementor();
684 if (k != NULL) {
685 if (k == get_instanceKlass()) {
686 // More than one implementors. Use 'this' in this case.
687 impl = this;
688 } else {
689 impl = CURRENT_THREAD_ENV->get_instance_klass(k);
690 }
691 }
692 }
693 // Memoize this result.
694 if (!is_shared()) {
695 _implementor = impl;
696 }
697 }
698 return impl;
699 }
700
701 bool ciInstanceKlass::can_be_inline_klass(bool is_exact) {
702 if (!EnableValhalla) {
703 return false;
704 }
705 if (!is_loaded() || is_inlinetype()) {
706 // Not loaded or known to be an inline klass
707 return true;
708 }
709 if (!is_exact) {
710 // Not exact, check if this is a valid super for an inline klass
711 VM_ENTRY_MARK;
712 return !get_instanceKlass()->invalid_inline_super();
713 }
714 return false;
715 }
716
717 // Utility class for printing of the contents of the static fields for
718 // use by compilation replay. It only prints out the information that
719 // could be consumed by the compiler, so for primitive types it prints
720 // out the actual value. For Strings it's the actual string value.
721 // For array types it it's first level array size since that's the
722 // only value which statically unchangeable. For all other reference
723 // types it simply prints out the dynamic type.
724
725 class StaticFieldPrinter : public FieldClosure {
726 protected:
727 outputStream* _out;
728 public:
729 StaticFieldPrinter(outputStream* out) :
730 _out(out) {
731 }
732 void do_field_helper(fieldDescriptor* fd, oop obj, bool flattened);
733 };
734
735 class StaticFinalFieldPrinter : public StaticFieldPrinter {
736 const char* _holder;
737 public:
738 StaticFinalFieldPrinter(outputStream* out, const char* holder) :
739 StaticFieldPrinter(out), _holder(holder) {
740 }
741 void do_field(fieldDescriptor* fd) {
742 if (fd->is_final() && !fd->has_initial_value()) {
743 ResourceMark rm;
744 InstanceKlass* holder = fd->field_holder();
745 oop mirror = holder->java_mirror();
746 _out->print("staticfield %s %s ", _holder, fd->name()->as_quoted_ascii());
747 BasicType bt = fd->field_type();
748 if (bt != T_OBJECT && bt != T_ARRAY) {
749 _out->print("%s ", fd->signature()->as_quoted_ascii());
750 }
751 do_field_helper(fd, mirror, false);
752 _out->cr();
753 }
754 }
755 };
756
757 class InlineTypeFieldPrinter : public StaticFieldPrinter {
758 oop _obj;
759 public:
760 InlineTypeFieldPrinter(outputStream* out, oop obj) :
761 StaticFieldPrinter(out), _obj(obj) {
762 }
763 void do_field(fieldDescriptor* fd) {
764 do_field_helper(fd, _obj, true);
765 _out->print(" ");
766 }
767 };
768
769 void StaticFieldPrinter::do_field_helper(fieldDescriptor* fd, oop mirror, bool flattened) {
770 BasicType bt = fd->field_type();
771 switch (bt) {
772 case T_BYTE: _out->print("%d", mirror->byte_field(fd->offset())); break;
773 case T_BOOLEAN: _out->print("%d", mirror->bool_field(fd->offset())); break;
774 case T_SHORT: _out->print("%d", mirror->short_field(fd->offset())); break;
775 case T_CHAR: _out->print("%d", mirror->char_field(fd->offset())); break;
776 case T_INT: _out->print("%d", mirror->int_field(fd->offset())); break;
777 case T_LONG: _out->print(INT64_FORMAT, (int64_t)(mirror->long_field(fd->offset()))); break;
778 case T_FLOAT: {
779 float f = mirror->float_field(fd->offset());
780 _out->print("%d", *(int*)&f);
781 break;
782 }
783 case T_DOUBLE: {
784 double d = mirror->double_field(fd->offset());
785 _out->print(INT64_FORMAT, *(int64_t*)&d);
786 break;
787 }
788 case T_ARRAY: // fall-through
789 case T_OBJECT: {
790 _out->print("%s ", fd->signature()->as_quoted_ascii());
791 oop value = mirror->obj_field_acquire(fd->offset());
792 if (value == NULL) {
793 _out->print_cr("null");
794 } else if (value->is_instance()) {
795 assert(fd->field_type() == T_OBJECT, "");
796 if (value->is_a(vmClasses::String_klass())) {
797 const char* ascii_value = java_lang_String::as_quoted_ascii(value);
798 _out->print("\"%s\"", (ascii_value != NULL) ? ascii_value : "");
799 } else {
800 const char* klass_name = value->klass()->name()->as_quoted_ascii();
801 _out->print("%s", klass_name);
802 }
803 } else if (value->is_array()) {
804 typeArrayOop ta = (typeArrayOop)value;
805 _out->print("%d", ta->length());
806 if (value->is_objArray() || value->is_flatArray()) {
807 objArrayOop oa = (objArrayOop)value;
808 const char* klass_name = value->klass()->name()->as_quoted_ascii();
809 _out->print(" %s", klass_name);
810 }
811 } else {
812 ShouldNotReachHere();
813 }
814 break;
815 }
816 case T_PRIMITIVE_OBJECT: {
817 ResetNoHandleMark rnhm;
818 Thread* THREAD = Thread::current();
819 SignatureStream ss(fd->signature(), false);
820 Symbol* name = ss.as_symbol();
821 assert(!HAS_PENDING_EXCEPTION, "can resolve klass?");
822 InstanceKlass* holder = fd->field_holder();
823 InstanceKlass* k = SystemDictionary::find_instance_klass(name,
824 Handle(THREAD, holder->class_loader()),
825 Handle(THREAD, holder->protection_domain()));
826 assert(k != NULL && !HAS_PENDING_EXCEPTION, "can resolve klass?");
827 InlineKlass* vk = InlineKlass::cast(k);
828 oop obj;
829 if (flattened) {
830 int field_offset = fd->offset() - vk->first_field_offset();
831 obj = cast_to_oop(cast_from_oop<address>(mirror) + field_offset);
832 } else {
833 obj = mirror->obj_field_acquire(fd->offset());
834 }
835 InlineTypeFieldPrinter print_field(_out, obj);
836 vk->do_nonstatic_fields(&print_field);
837 break;
838 }
839 default:
840 ShouldNotReachHere();
841 }
842 }
843
844 const char *ciInstanceKlass::replay_name() const {
845 return CURRENT_ENV->replay_name(get_instanceKlass());
846 }
847
848 void ciInstanceKlass::dump_replay_instanceKlass(outputStream* out, InstanceKlass* ik) {
849 if (ik->is_hidden()) {
850 const char *name = CURRENT_ENV->dyno_name(ik);
851 if (name != NULL) {
852 out->print_cr("instanceKlass %s # %s", name, ik->name()->as_quoted_ascii());
853 } else {
854 out->print_cr("# instanceKlass %s", ik->name()->as_quoted_ascii());
855 }
856 } else {
857 out->print_cr("instanceKlass %s", ik->name()->as_quoted_ascii());
858 }
859 }
860
861 void ciInstanceKlass::dump_replay_data(outputStream* out) {
862 ResourceMark rm;
863
864 InstanceKlass* ik = get_instanceKlass();
865 ConstantPool* cp = ik->constants();
866
867 // Try to record related loaded classes
868 Klass* sub = ik->subklass();
869 while (sub != NULL) {
870 if (sub->is_instance_klass()) {
871 InstanceKlass *isub = InstanceKlass::cast(sub);
872 dump_replay_instanceKlass(out, isub);
873 }
874 sub = sub->next_sibling();
875 }
876
877 // Dump out the state of the constant pool tags. During replay the
878 // tags will be validated for things which shouldn't change and
879 // classes will be resolved if the tags indicate that they were
880 // resolved at compile time.
881 const char *name = replay_name();
882 out->print("ciInstanceKlass %s %d %d %d", name,
883 is_linked(), is_initialized(), cp->length());
884 for (int index = 1; index < cp->length(); index++) {
885 out->print(" %d", cp->tags()->at(index));
886 }
887 out->cr();
888 if (is_initialized()) {
889 // Dump out the static final fields in case the compilation relies
890 // on their value for correct replay.
891 StaticFinalFieldPrinter sffp(out, name);
892 ik->do_local_static_fields(&sffp);
893 }
894 }
895
896 #ifdef ASSERT
897 bool ciInstanceKlass::debug_final_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_final();
903 }
904 );
905 return false;
906 }
907
908 bool ciInstanceKlass::debug_stable_field_at(int offset) {
909 GUARDED_VM_ENTRY(
910 InstanceKlass* ik = get_instanceKlass();
911 fieldDescriptor fd;
912 if (ik->find_field_from_offset(offset, false, &fd)) {
913 return fd.is_stable();
914 }
915 );
916 return false;
917 }
918 #endif