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 _nonstatic_field_size = ik->nonstatic_field_size();
69 _has_nonstatic_fields = ik->has_nonstatic_fields();
70 _has_nonstatic_concrete_methods = ik->has_nonstatic_concrete_methods();
71 _is_hidden = ik->is_hidden();
72 _is_record = ik->is_record();
73 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields:
74 _has_injected_fields = -1;
75 _implementor = NULL; // we will fill these lazily
76
77 // Ensure that the metadata wrapped by the ciMetadata is kept alive by GC.
78 // This is primarily useful for metadata which is considered as weak roots
79 // by the GC but need to be strong roots if reachable from a current compilation.
80 // InstanceKlass are created for both weak and strong metadata. Ensuring this metadata
81 // alive covers the cases where there are weak roots without performance cost.
82 oop holder = ik->klass_holder();
83 if (ik->class_loader_data()->has_class_mirror_holder()) {
84 // Though ciInstanceKlass records class loader oop, it's not enough to keep
85 // non-strong hidden classes alive (loader == NULL). Klass holder should
86 // be used instead. It is enough to record a ciObject, since cached elements are never removed
87 // during ciObjectFactory lifetime. ciObjectFactory itself is created for
88 // every compilation and lives for the whole duration of the compilation.
89 assert(holder != NULL, "holder of hidden class is the mirror which is never null");
90 (void)CURRENT_ENV->get_object(holder);
91 }
92
93 Thread *thread = Thread::current();
94 if (ciObjectFactory::is_initialized()) {
95 _loader = JNIHandles::make_local(thread, ik->class_loader());
96 _protection_domain = JNIHandles::make_local(thread,
97 ik->protection_domain());
98 _is_shared = false;
99 } else {
100 Handle h_loader(thread, ik->class_loader());
101 Handle h_protection_domain(thread, ik->protection_domain());
102 _loader = JNIHandles::make_global(h_loader);
103 _protection_domain = JNIHandles::make_global(h_protection_domain);
104 _is_shared = true;
105 }
106
107 // Lazy fields get filled in only upon request.
108 _super = NULL;
109 _java_mirror = NULL;
110
111 if (is_shared()) {
112 if (k != vmClasses::Object_klass()) {
113 super();
114 }
115 //compute_nonstatic_fields(); // done outside of constructor
116 }
117
118 _field_cache = NULL;
119 }
120
121 // Version for unloaded classes:
122 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
123 jobject loader, jobject protection_domain,
124 BasicType bt)
125 : ciKlass(name, bt)
126 {
127 assert(name->char_at(0) != JVM_SIGNATURE_ARRAY, "not an instance klass");
128 _init_state = (InstanceKlass::ClassState)0;
129 _nonstatic_field_size = -1;
130 _has_nonstatic_fields = false;
131 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields
132 _has_injected_fields = -1;
133 _is_hidden = false;
134 _is_record = false;
135 _loader = loader;
136 _protection_domain = protection_domain;
137 _is_shared = false;
138 _super = NULL;
139 _java_mirror = NULL;
140 _field_cache = NULL;
141 }
142
143
144
145 // ------------------------------------------------------------------
146 // ciInstanceKlass::compute_shared_is_initialized
147 void ciInstanceKlass::compute_shared_init_state() {
148 GUARDED_VM_ENTRY(
149 InstanceKlass* ik = get_instanceKlass();
150 _init_state = ik->init_state();
151 )
152 }
153
154 // ------------------------------------------------------------------
155 // ciInstanceKlass::compute_shared_has_subklass
156 bool ciInstanceKlass::compute_shared_has_subklass() {
157 GUARDED_VM_ENTRY(
158 InstanceKlass* ik = get_instanceKlass();
159 _has_subklass = ik->subklass() != NULL ? subklass_true : subklass_false;
160 return _has_subklass == subklass_true;
161 )
162 }
163
164 // ------------------------------------------------------------------
165 // ciInstanceKlass::loader
166 oop ciInstanceKlass::loader() {
167 ASSERT_IN_VM;
168 return JNIHandles::resolve(_loader);
169 }
170
171 // ------------------------------------------------------------------
172 // ciInstanceKlass::loader_handle
173 jobject ciInstanceKlass::loader_handle() {
174 return _loader;
175 }
176
177 // ------------------------------------------------------------------
178 // ciInstanceKlass::protection_domain
179 oop ciInstanceKlass::protection_domain() {
180 ASSERT_IN_VM;
181 return JNIHandles::resolve(_protection_domain);
182 }
183
184 // ------------------------------------------------------------------
185 // ciInstanceKlass::protection_domain_handle
186 jobject ciInstanceKlass::protection_domain_handle() {
187 return _protection_domain;
188 }
189
190 // ------------------------------------------------------------------
191 // ciInstanceKlass::field_cache
192 //
193 // Get the field cache associated with this klass.
194 ciConstantPoolCache* ciInstanceKlass::field_cache() {
195 if (is_shared()) {
196 return NULL;
197 }
198 if (_field_cache == NULL) {
199 assert(!is_java_lang_Object(), "Object has no fields");
200 Arena* arena = CURRENT_ENV->arena();
201 _field_cache = new (arena) ciConstantPoolCache(arena, 5);
202 }
203 return _field_cache;
204 }
205
206 // ------------------------------------------------------------------
207 // ciInstanceKlass::get_canonical_holder
208 //
209 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
210 #ifdef ASSERT
211 if (!(offset >= 0 && offset < layout_helper_size_in_bytes())) {
212 tty->print("*** get_canonical_holder(%d) on ", offset);
213 this->print();
214 tty->print_cr(" ***");
215 };
216 assert(offset >= 0 && offset < layout_helper_size_in_bytes(), "offset must be tame");
217 #endif
218
219 if (offset < instanceOopDesc::base_offset_in_bytes()) {
220 // All header offsets belong properly to java/lang/Object.
221 return CURRENT_ENV->Object_klass();
222 }
223
224 ciInstanceKlass* self = this;
225 assert(self->is_loaded(), "must be loaded to access field info");
226 ciField* field = self->get_field_by_offset(offset, false);
227 if (field != NULL) {
228 return field->holder();
229 } else {
230 for (;;) {
231 assert(self->is_loaded(), "must be loaded to have size");
232 ciInstanceKlass* super = self->super();
233 if (super == NULL ||
234 super->nof_nonstatic_fields() == 0 ||
235 super->layout_helper_size_in_bytes() <= offset) {
236 return self;
237 } else {
238 self = super; // return super->get_canonical_holder(offset)
239 }
240 }
241 }
242 }
243
244 // ------------------------------------------------------------------
245 // ciInstanceKlass::is_java_lang_Object
246 //
247 // Is this klass java.lang.Object?
248 bool ciInstanceKlass::is_java_lang_Object() const {
249 return equals(CURRENT_ENV->Object_klass());
250 }
251
252 // ------------------------------------------------------------------
253 // ciInstanceKlass::uses_default_loader
254 bool ciInstanceKlass::uses_default_loader() const {
255 // Note: We do not need to resolve the handle or enter the VM
256 // in order to test null-ness.
257 return _loader == NULL;
258 }
259
260 // ------------------------------------------------------------------
261
262 /**
263 * Return basic type of boxed value for box klass or T_OBJECT if not.
264 */
265 BasicType ciInstanceKlass::box_klass_type() const {
266 if (uses_default_loader() && is_loaded()) {
267 return vmClasses::box_klass_type(get_Klass());
268 } else {
269 return T_OBJECT;
270 }
271 }
272
273 /**
274 * Is this boxing klass?
275 */
276 bool ciInstanceKlass::is_box_klass() const {
277 return is_java_primitive(box_klass_type());
278 }
279
280 /**
281 * Is this boxed value offset?
282 */
283 bool ciInstanceKlass::is_boxed_value_offset(int offset) const {
284 BasicType bt = box_klass_type();
285 return is_java_primitive(bt) &&
286 (offset == java_lang_boxing_object::value_offset(bt));
287 }
288
289 static bool is_klass_initialized(Symbol* klass_name) {
290 VM_ENTRY_MARK;
291 InstanceKlass* ik = SystemDictionary::find_instance_klass(klass_name, Handle(), Handle());
292 return ik != nullptr && ik->is_initialized();
293 }
294
295 bool ciInstanceKlass::is_box_cache_valid() const {
296 BasicType box_type = box_klass_type();
297
298 if (box_type != T_OBJECT) {
299 switch(box_type) {
300 case T_INT: return is_klass_initialized(java_lang_Integer_IntegerCache::symbol());
301 case T_CHAR: return is_klass_initialized(java_lang_Character_CharacterCache::symbol());
302 case T_SHORT: return is_klass_initialized(java_lang_Short_ShortCache::symbol());
303 case T_BYTE: return is_klass_initialized(java_lang_Byte_ByteCache::symbol());
304 case T_LONG: return is_klass_initialized(java_lang_Long_LongCache::symbol());
305 case T_BOOLEAN:
306 case T_FLOAT:
307 case T_DOUBLE: return true;
308 default:;
309 }
310 }
311 return false;
312 }
313
314 // ------------------------------------------------------------------
315 // ciInstanceKlass::is_in_package
316 //
317 // Is this klass in the given package?
318 bool ciInstanceKlass::is_in_package(const char* packagename, int len) {
319 // To avoid class loader mischief, this test always rejects application classes.
320 if (!uses_default_loader())
321 return false;
322 GUARDED_VM_ENTRY(
323 return is_in_package_impl(packagename, len);
324 )
325 }
326
327 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) {
328 ASSERT_IN_VM;
329
330 // If packagename contains trailing '/' exclude it from the
331 // prefix-test since we test for it explicitly.
332 if (packagename[len - 1] == '/')
333 len--;
334
335 if (!name()->starts_with(packagename, len))
336 return false;
337
338 // Test if the class name is something like "java/lang".
339 if ((len + 1) > name()->utf8_length())
340 return false;
341
342 // Test for trailing '/'
343 if (name()->char_at(len) != '/')
344 return false;
345
346 // Make sure it's not actually in a subpackage:
347 if (name()->index_of_at(len+1, "/", 1) >= 0)
348 return false;
349
350 return true;
351 }
352
353 // ------------------------------------------------------------------
354 // ciInstanceKlass::print_impl
355 //
356 // Implementation of the print method.
357 void ciInstanceKlass::print_impl(outputStream* st) {
358 ciKlass::print_impl(st);
359 GUARDED_VM_ENTRY(st->print(" loader=" INTPTR_FORMAT, p2i(loader()));)
360 if (is_loaded()) {
361 st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=",
362 bool_to_str(is_initialized()),
363 bool_to_str(has_finalizer()),
364 bool_to_str(has_subklass()),
365 layout_helper());
366
367 _flags.print_klass_flags(st);
368
369 if (_super) {
370 st->print(" super=");
371 _super->print_name_on(st);
372 }
373 if (_java_mirror) {
374 st->print(" mirror=PRESENT");
375 }
376 } else {
377 st->print(" loaded=false");
378 }
379 }
380
381 // ------------------------------------------------------------------
382 // ciInstanceKlass::super
383 //
384 // Get the superklass of this klass.
385 ciInstanceKlass* ciInstanceKlass::super() {
386 assert(is_loaded(), "must be loaded");
387 if (_super == NULL && !is_java_lang_Object()) {
388 GUARDED_VM_ENTRY(
389 Klass* super_klass = get_instanceKlass()->super();
390 _super = CURRENT_ENV->get_instance_klass(super_klass);
391 )
392 }
393 return _super;
394 }
395
396 // ------------------------------------------------------------------
397 // ciInstanceKlass::java_mirror
398 //
399 // Get the instance of java.lang.Class corresponding to this klass.
400 // Cache it on this->_java_mirror.
401 ciInstance* ciInstanceKlass::java_mirror() {
402 if (is_shared()) {
403 return ciKlass::java_mirror();
404 }
405 if (_java_mirror == NULL) {
406 _java_mirror = ciKlass::java_mirror();
407 }
408 return _java_mirror;
409 }
410
411 // ------------------------------------------------------------------
412 // ciInstanceKlass::unique_concrete_subklass
413 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
414 if (!is_loaded()) return NULL; // No change if class is not loaded
415 if (!is_abstract()) return NULL; // Only applies to abstract classes.
416 if (!has_subklass()) return NULL; // Must have at least one subklass.
417 VM_ENTRY_MARK;
418 InstanceKlass* ik = get_instanceKlass();
419 Klass* up = ik->up_cast_abstract();
420 assert(up->is_instance_klass(), "must be InstanceKlass");
421 if (ik == up) {
422 return NULL;
423 }
424 return CURRENT_THREAD_ENV->get_instance_klass(up);
425 }
426
427 // ------------------------------------------------------------------
428 // ciInstanceKlass::has_finalizable_subclass
429 bool ciInstanceKlass::has_finalizable_subclass() {
430 if (!is_loaded()) return true;
431 VM_ENTRY_MARK;
432 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL;
433 }
434
435 // ------------------------------------------------------------------
436 // ciInstanceKlass::contains_field_offset
437 bool ciInstanceKlass::contains_field_offset(int offset) {
438 VM_ENTRY_MARK;
439 return get_instanceKlass()->contains_field_offset(offset);
440 }
441
442 // ------------------------------------------------------------------
443 // ciInstanceKlass::get_field_by_offset
444 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
445 if (!is_static) {
446 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
447 ciField* field = _nonstatic_fields->at(i);
448 int field_off = field->offset_in_bytes();
449 if (field_off == field_offset)
450 return field;
451 if (field_off > field_offset)
452 break;
453 // could do binary search or check bins, but probably not worth it
454 }
455 return NULL;
456 }
457 VM_ENTRY_MARK;
458 InstanceKlass* k = get_instanceKlass();
459 fieldDescriptor fd;
460 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
461 return NULL;
462 }
463 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
464 return field;
465 }
466
467 ciField* ciInstanceKlass::get_non_flattened_field_by_offset(int field_offset) {
468 if (super() != NULL && super()->has_nonstatic_fields()) {
469 ciField* f = super()->get_non_flattened_field_by_offset(field_offset);
470 if (f != NULL) {
471 return f;
472 }
473 }
474
475 VM_ENTRY_MARK;
476 InstanceKlass* k = get_instanceKlass();
477 Arena* arena = CURRENT_ENV->arena();
478 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
479 if (fs.access_flags().is_static()) continue;
480 fieldDescriptor& fd = fs.field_descriptor();
481 if (fd.offset() == field_offset) {
482 ciField* f = new (arena) ciField(&fd);
483 return f;
484 }
485 }
486
487 return NULL;
488 }
489
490 // ------------------------------------------------------------------
491 // ciInstanceKlass::get_field_by_name
492 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
493 VM_ENTRY_MARK;
494 InstanceKlass* k = get_instanceKlass();
495 fieldDescriptor fd;
496 Klass* def = k->find_field(name->get_symbol(), signature->get_symbol(), is_static, &fd);
497 if (def == NULL) {
498 return NULL;
499 }
500 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
501 return field;
502 }
503
504
505 static int sort_field_by_offset(ciField** a, ciField** b) {
506 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
507 // (no worries about 32-bit overflow...)
508 }
509
510 // ------------------------------------------------------------------
511 // ciInstanceKlass::compute_nonstatic_fields
512 int ciInstanceKlass::compute_nonstatic_fields() {
513 assert(is_loaded(), "must be loaded");
514
515 if (_nonstatic_fields != NULL)
516 return _nonstatic_fields->length();
517
518 if (!has_nonstatic_fields()) {
519 Arena* arena = CURRENT_ENV->arena();
520 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL);
521 return 0;
522 }
523 assert(!is_java_lang_Object(), "bootstrap OK");
524
525 // Size in bytes of my fields, including inherited fields.
526 int fsize = nonstatic_field_size() * heapOopSize;
527
528 ciInstanceKlass* super = this->super();
529 GrowableArray<ciField*>* super_fields = NULL;
530 if (super != NULL && super->has_nonstatic_fields()) {
531 int super_flen = super->nof_nonstatic_fields();
532 super_fields = super->_nonstatic_fields;
533 assert(super_flen == 0 || super_fields != NULL, "first get nof_fields");
534 }
535
536 GrowableArray<ciField*>* fields = NULL;
537 GUARDED_VM_ENTRY({
538 fields = compute_nonstatic_fields_impl(super_fields);
539 });
540
541 if (fields == NULL) {
542 // This can happen if this class (java.lang.Class) has invisible fields.
543 if (super_fields != NULL) {
544 _nonstatic_fields = super_fields;
545 return super_fields->length();
546 } else {
547 return 0;
548 }
549 }
550
551 _nonstatic_fields = fields;
552 return fields->length();
553 }
554
555 GrowableArray<ciField*>* ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields, bool flatten) {
556 ASSERT_IN_VM;
557 Arena* arena = CURRENT_ENV->arena();
558 int flen = 0;
559 GrowableArray<ciField*>* fields = NULL;
560 InstanceKlass* k = get_instanceKlass();
561 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
562 if (fs.access_flags().is_static()) continue;
563 flen += 1;
564 }
565
566 // allocate the array:
567 if (flen == 0) {
568 return NULL; // return nothing if none are locally declared
569 }
570 if (super_fields != NULL) {
571 flen += super_fields->length();
572 }
573
574 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL);
575 if (super_fields != NULL) {
576 fields->appendAll(super_fields);
577 }
578
579 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
580 if (fs.access_flags().is_static()) continue;
581 fieldDescriptor& fd = fs.field_descriptor();
582 if (fd.is_inlined() && flatten) {
583 // Inline type fields are embedded
584 int field_offset = fd.offset();
585 // Get InlineKlass and adjust number of fields
586 Klass* k = get_instanceKlass()->get_inline_type_field_klass(fd.index());
587 ciInlineKlass* vk = CURRENT_ENV->get_klass(k)->as_inline_klass();
588 flen += vk->nof_nonstatic_fields() - 1;
589 // Iterate over fields of the flattened inline type and copy them to 'this'
590 for (int i = 0; i < vk->nof_nonstatic_fields(); ++i) {
591 ciField* flattened_field = vk->nonstatic_field_at(i);
592 // Adjust offset to account for missing oop header
593 int offset = field_offset + (flattened_field->offset() - vk->first_field_offset());
594 // A flattened field can be treated as final if the non-flattened
595 // field is declared final or the holder klass is an inline type itself.
596 bool is_final = fd.is_final() || is_inlinetype();
597 ciField* field = new (arena) ciField(flattened_field, this, offset, is_final);
598 fields->append(field);
599 }
600 } else {
601 ciField* field = new (arena) ciField(&fd);
602 fields->append(field);
603 }
604 }
605 assert(fields->length() == flen, "sanity");
606 // Now sort them by offset, ascending.
607 // (In principle, they could mix with superclass fields.)
608 fields->sort(sort_field_by_offset);
609 return fields;
610 }
611
612 bool ciInstanceKlass::compute_injected_fields_helper() {
613 ASSERT_IN_VM;
614 InstanceKlass* k = get_instanceKlass();
615
616 for (InternalFieldStream fs(k); !fs.done(); fs.next()) {
617 if (fs.access_flags().is_static()) continue;
618 return true;
619 }
620 return false;
621 }
622
623 void ciInstanceKlass::compute_injected_fields() {
624 assert(is_loaded(), "must be loaded");
625
626 int has_injected_fields = 0;
627 if (super() != NULL && super()->has_injected_fields()) {
628 has_injected_fields = 1;
629 } else {
630 GUARDED_VM_ENTRY({
631 has_injected_fields = compute_injected_fields_helper() ? 1 : 0;
632 });
633 }
634 // may be concurrently initialized for shared ciInstanceKlass objects
635 assert(_has_injected_fields == -1 || _has_injected_fields == has_injected_fields, "broken concurrent initialization");
636 _has_injected_fields = has_injected_fields;
637 }
638
639 bool ciInstanceKlass::has_object_fields() const {
640 GUARDED_VM_ENTRY(
641 return get_instanceKlass()->nonstatic_oop_map_size() > 0;
642 );
643 }
644
645 // ------------------------------------------------------------------
646 // ciInstanceKlass::find_method
647 //
648 // Find a method in this klass.
649 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
650 VM_ENTRY_MARK;
651 InstanceKlass* k = get_instanceKlass();
652 Symbol* name_sym = name->get_symbol();
653 Symbol* sig_sym= signature->get_symbol();
654
655 Method* m = k->find_method(name_sym, sig_sym);
656 if (m == NULL) return NULL;
657
658 return CURRENT_THREAD_ENV->get_method(m);
659 }
660
661 // ------------------------------------------------------------------
662 // ciInstanceKlass::is_leaf_type
663 bool ciInstanceKlass::is_leaf_type() {
664 assert(is_loaded(), "must be loaded");
665 if (is_shared()) {
666 return is_final(); // approximately correct
667 } else {
668 return !has_subklass() && (nof_implementors() == 0);
669 }
670 }
671
672 // ------------------------------------------------------------------
673 // ciInstanceKlass::implementor
674 //
675 // Report an implementor of this interface.
676 // Note that there are various races here, since my copy
677 // of _nof_implementors might be out of date with respect
678 // to results returned by InstanceKlass::implementor.
679 // This is OK, since any dependencies we decide to assert
680 // will be checked later under the Compile_lock.
681 ciInstanceKlass* ciInstanceKlass::implementor() {
682 ciInstanceKlass* impl = _implementor;
683 if (impl == NULL) {
684 // Go into the VM to fetch the implementor.
685 {
686 VM_ENTRY_MARK;
687 MutexLocker ml(Compile_lock);
688 Klass* k = get_instanceKlass()->implementor();
689 if (k != NULL) {
690 if (k == get_instanceKlass()) {
691 // More than one implementors. Use 'this' in this case.
692 impl = this;
693 } else {
694 impl = CURRENT_THREAD_ENV->get_instance_klass(k);
695 }
696 }
697 }
698 // Memoize this result.
699 if (!is_shared()) {
700 _implementor = impl;
701 }
702 }
703 return impl;
704 }
705
706 bool ciInstanceKlass::can_be_inline_klass(bool is_exact) {
707 if (!EnableValhalla) {
708 return false;
709 }
710 if (!is_loaded() || is_inlinetype()) {
711 // Not loaded or known to be an inline klass
712 return true;
713 }
714 if (!is_exact) {
715 // Not exact, check if this is a valid super for an inline klass
716 VM_ENTRY_MARK;
717 return !get_instanceKlass()->invalid_inline_super();
718 }
719 return false;
720 }
721
722 // Utility class for printing of the contents of the static fields for
723 // use by compilation replay. It only prints out the information that
724 // could be consumed by the compiler, so for primitive types it prints
725 // out the actual value. For Strings it's the actual string value.
726 // For array types it it's first level array size since that's the
727 // only value which statically unchangeable. For all other reference
728 // types it simply prints out the dynamic type.
729
730 class StaticFieldPrinter : public FieldClosure {
731 protected:
732 outputStream* _out;
733 public:
734 StaticFieldPrinter(outputStream* out) :
735 _out(out) {
736 }
737 void do_field_helper(fieldDescriptor* fd, oop obj, bool flattened);
738 };
739
740 class StaticFinalFieldPrinter : public StaticFieldPrinter {
741 const char* _holder;
742 public:
743 StaticFinalFieldPrinter(outputStream* out, const char* holder) :
744 StaticFieldPrinter(out), _holder(holder) {
745 }
746 void do_field(fieldDescriptor* fd) {
747 if (fd->is_final() && !fd->has_initial_value()) {
748 ResourceMark rm;
749 InstanceKlass* holder = fd->field_holder();
750 oop mirror = holder->java_mirror();
751 _out->print("staticfield %s %s ", _holder, fd->name()->as_quoted_ascii());
752 BasicType bt = fd->field_type();
753 if (bt != T_OBJECT && bt != T_ARRAY) {
754 _out->print("%s ", fd->signature()->as_quoted_ascii());
755 }
756 do_field_helper(fd, mirror, false);
757 _out->cr();
758 }
759 }
760 };
761
762 class InlineTypeFieldPrinter : public StaticFieldPrinter {
763 oop _obj;
764 public:
765 InlineTypeFieldPrinter(outputStream* out, oop obj) :
766 StaticFieldPrinter(out), _obj(obj) {
767 }
768 void do_field(fieldDescriptor* fd) {
769 do_field_helper(fd, _obj, true);
770 _out->print(" ");
771 }
772 };
773
774 void StaticFieldPrinter::do_field_helper(fieldDescriptor* fd, oop mirror, bool flattened) {
775 BasicType bt = fd->field_type();
776 switch (bt) {
777 case T_BYTE: _out->print("%d", mirror->byte_field(fd->offset())); break;
778 case T_BOOLEAN: _out->print("%d", mirror->bool_field(fd->offset())); break;
779 case T_SHORT: _out->print("%d", mirror->short_field(fd->offset())); break;
780 case T_CHAR: _out->print("%d", mirror->char_field(fd->offset())); break;
781 case T_INT: _out->print("%d", mirror->int_field(fd->offset())); break;
782 case T_LONG: _out->print(INT64_FORMAT, (int64_t)(mirror->long_field(fd->offset()))); break;
783 case T_FLOAT: {
784 float f = mirror->float_field(fd->offset());
785 _out->print("%d", *(int*)&f);
786 break;
787 }
788 case T_DOUBLE: {
789 double d = mirror->double_field(fd->offset());
790 _out->print(INT64_FORMAT, *(int64_t*)&d);
791 break;
792 }
793 case T_ARRAY: // fall-through
794 case T_OBJECT: {
795 _out->print("%s ", fd->signature()->as_quoted_ascii());
796 oop value = mirror->obj_field_acquire(fd->offset());
797 if (value == NULL) {
798 _out->print_cr("null");
799 } else if (value->is_instance()) {
800 assert(fd->field_type() == T_OBJECT, "");
801 if (value->is_a(vmClasses::String_klass())) {
802 const char* ascii_value = java_lang_String::as_quoted_ascii(value);
803 _out->print("\"%s\"", (ascii_value != NULL) ? ascii_value : "");
804 } else {
805 const char* klass_name = value->klass()->name()->as_quoted_ascii();
806 _out->print("%s", klass_name);
807 }
808 } else if (value->is_array()) {
809 typeArrayOop ta = (typeArrayOop)value;
810 _out->print("%d", ta->length());
811 if (value->is_objArray() || value->is_flatArray()) {
812 objArrayOop oa = (objArrayOop)value;
813 const char* klass_name = value->klass()->name()->as_quoted_ascii();
814 _out->print(" %s", klass_name);
815 }
816 } else {
817 ShouldNotReachHere();
818 }
819 break;
820 }
821 case T_INLINE_TYPE: {
822 ResetNoHandleMark rnhm;
823 Thread* THREAD = Thread::current();
824 SignatureStream ss(fd->signature(), false);
825 Symbol* name = ss.as_symbol();
826 assert(!HAS_PENDING_EXCEPTION, "can resolve klass?");
827 InstanceKlass* holder = fd->field_holder();
828 InstanceKlass* k = SystemDictionary::find_instance_klass(name,
829 Handle(THREAD, holder->class_loader()),
830 Handle(THREAD, holder->protection_domain()));
831 assert(k != NULL && !HAS_PENDING_EXCEPTION, "can resolve klass?");
832 InlineKlass* vk = InlineKlass::cast(k);
833 oop obj;
834 if (flattened) {
835 int field_offset = fd->offset() - vk->first_field_offset();
836 obj = cast_to_oop(cast_from_oop<address>(mirror) + field_offset);
837 } else {
838 obj = mirror->obj_field_acquire(fd->offset());
839 }
840 InlineTypeFieldPrinter print_field(_out, obj);
841 vk->do_nonstatic_fields(&print_field);
842 break;
843 }
844 default:
845 ShouldNotReachHere();
846 }
847 }
848
849 const char *ciInstanceKlass::replay_name() const {
850 return CURRENT_ENV->replay_name(get_instanceKlass());
851 }
852
853 void ciInstanceKlass::dump_replay_data(outputStream* out) {
854 ResourceMark rm;
855
856 InstanceKlass* ik = get_instanceKlass();
857 ConstantPool* cp = ik->constants();
858
859 // Try to record related loaded classes
860 Klass* sub = ik->subklass();
861 while (sub != NULL) {
862 if (sub->is_instance_klass()) {
863 InstanceKlass *isub = InstanceKlass::cast(sub);
864 if (isub->is_hidden()) {
865 const char *name = CURRENT_ENV->dyno_name(isub);
866 if (name != NULL) {
867 out->print_cr("instanceKlass %s # %s", name, sub->name()->as_quoted_ascii());
868 } else {
869 out->print_cr("# instanceKlass %s", sub->name()->as_quoted_ascii());
870 }
871 } else {
872 out->print_cr("instanceKlass %s", sub->name()->as_quoted_ascii());
873 }
874 }
875 sub = sub->next_sibling();
876 }
877
878 // Dump out the state of the constant pool tags. During replay the
879 // tags will be validated for things which shouldn't change and
880 // classes will be resolved if the tags indicate that they were
881 // resolved at compile time.
882 const char *name = replay_name();
883 out->print("ciInstanceKlass %s %d %d %d", name,
884 is_linked(), is_initialized(), cp->length());
885 for (int index = 1; index < cp->length(); index++) {
886 out->print(" %d", cp->tags()->at(index));
887 }
888 out->cr();
889 if (is_initialized()) {
890 // Dump out the static final fields in case the compilation relies
891 // on their value for correct replay.
892 StaticFinalFieldPrinter sffp(out, name);
893 ik->do_local_static_fields(&sffp);
894 }
895 }
896
897 #ifdef ASSERT
898 bool ciInstanceKlass::debug_final_field_at(int offset) {
899 GUARDED_VM_ENTRY(
900 InstanceKlass* ik = get_instanceKlass();
901 fieldDescriptor fd;
902 if (ik->find_field_from_offset(offset, false, &fd)) {
903 return fd.is_final();
904 }
905 );
906 return false;
907 }
908
909 bool ciInstanceKlass::debug_stable_field_at(int offset) {
910 GUARDED_VM_ENTRY(
911 InstanceKlass* ik = get_instanceKlass();
912 fieldDescriptor fd;
913 if (ik->find_field_from_offset(offset, false, &fd)) {
914 return fd.is_stable();
915 }
916 );
917 return false;
918 }
919 #endif