1 /*
2 * Copyright (c) 1999, 2018, 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/ciInstance.hpp"
28 #include "ci/ciInstanceKlass.hpp"
29 #include "ci/ciUtilities.inline.hpp"
30 #include "ci/ciValueKlass.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "memory/allocation.hpp"
33 #include "memory/allocation.inline.hpp"
34 #include "memory/resourceArea.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "oops/fieldStreams.hpp"
37 #include "oops/valueKlass.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 = access_flags.has_finalizer();
62 _has_subklass = flags().is_final() ? subklass_false : subklass_unknown;
63 _init_state = ik->init_state();
64 _nonstatic_field_size = ik->nonstatic_field_size();
65 _has_nonstatic_fields = ik->has_nonstatic_fields();
66 _has_nonstatic_concrete_methods = ik->has_nonstatic_concrete_methods();
67 _is_unsafe_anonymous = ik->is_unsafe_anonymous();
68 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields
69 _has_injected_fields = -1;
70 _vcc_klass = NULL;
71 _implementor = NULL; // we will fill these lazily
72
73 // Ensure that the metadata wrapped by the ciMetadata is kept alive by GC.
74 // This is primarily useful for metadata which is considered as weak roots
75 // by the GC but need to be strong roots if reachable from a current compilation.
76 // InstanceKlass are created for both weak and strong metadata. Ensuring this metadata
77 // alive covers the cases where there are weak roots without performance cost.
78 oop holder = ik->klass_holder();
79 if (ik->is_unsafe_anonymous()) {
80 // Though ciInstanceKlass records class loader oop, it's not enough to keep
81 // VM unsafe anonymous classes alive (loader == NULL). Klass holder should
82 // be used instead. It is enough to record a ciObject, since cached elements are never removed
83 // during ciObjectFactory lifetime. ciObjectFactory itself is created for
84 // every compilation and lives for the whole duration of the compilation.
85 assert(holder != NULL, "holder of unsafe anonymous class is the mirror which is never null");
86 (void)CURRENT_ENV->get_object(holder);
87 }
88
89 Thread *thread = Thread::current();
90 if (ciObjectFactory::is_initialized()) {
91 _loader = JNIHandles::make_local(thread, ik->class_loader());
92 _protection_domain = JNIHandles::make_local(thread,
93 ik->protection_domain());
94 _is_shared = false;
95 } else {
96 Handle h_loader(thread, ik->class_loader());
97 Handle h_protection_domain(thread, ik->protection_domain());
98 _loader = JNIHandles::make_global(h_loader);
99 _protection_domain = JNIHandles::make_global(h_protection_domain);
100 _is_shared = true;
101 }
102
103 // Lazy fields get filled in only upon request.
104 _super = NULL;
105 _java_mirror = NULL;
106
107 if (is_shared()) {
108 if (k != SystemDictionary::Object_klass()) {
109 super();
110 }
111 //compute_nonstatic_fields(); // done outside of constructor
112 }
113
114 _field_cache = NULL;
115 }
116
117 // Version for unloaded classes:
118 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
119 jobject loader, jobject protection_domain,
120 BasicType bt)
121 : ciKlass(name, bt)
122 {
123 assert(name->char_at(0) != '[', "not an instance klass");
124 _init_state = (InstanceKlass::ClassState)0;
125 _nonstatic_field_size = -1;
126 _has_nonstatic_fields = false;
127 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields
128 _has_injected_fields = -1;
129 _vcc_klass = NULL;
130 _is_unsafe_anonymous = false;
131 _loader = loader;
132 _protection_domain = protection_domain;
133 _is_shared = false;
134 _super = NULL;
135 _java_mirror = NULL;
136 _field_cache = NULL;
137 }
138
139
140
141 // ------------------------------------------------------------------
142 // ciInstanceKlass::compute_shared_is_initialized
143 void ciInstanceKlass::compute_shared_init_state() {
144 GUARDED_VM_ENTRY(
145 InstanceKlass* ik = get_instanceKlass();
146 _init_state = ik->init_state();
147 )
148 }
149
150 // ------------------------------------------------------------------
151 // ciInstanceKlass::compute_shared_has_subklass
152 bool ciInstanceKlass::compute_shared_has_subklass() {
153 GUARDED_VM_ENTRY(
154 InstanceKlass* ik = get_instanceKlass();
155 _has_subklass = ik->subklass() != NULL ? subklass_true : subklass_false;
156 return _has_subklass == subklass_true;
157 )
158 }
159
160 // ------------------------------------------------------------------
161 // ciInstanceKlass::loader
162 oop ciInstanceKlass::loader() {
163 ASSERT_IN_VM;
164 return JNIHandles::resolve(_loader);
165 }
166
167 // ------------------------------------------------------------------
168 // ciInstanceKlass::loader_handle
169 jobject ciInstanceKlass::loader_handle() {
170 return _loader;
171 }
172
173 // ------------------------------------------------------------------
174 // ciInstanceKlass::protection_domain
175 oop ciInstanceKlass::protection_domain() {
176 ASSERT_IN_VM;
177 return JNIHandles::resolve(_protection_domain);
178 }
179
180 // ------------------------------------------------------------------
181 // ciInstanceKlass::protection_domain_handle
182 jobject ciInstanceKlass::protection_domain_handle() {
183 return _protection_domain;
184 }
185
186 // ------------------------------------------------------------------
187 // ciInstanceKlass::field_cache
188 //
189 // Get the field cache associated with this klass.
190 ciConstantPoolCache* ciInstanceKlass::field_cache() {
191 if (is_shared()) {
192 return NULL;
193 }
194 if (_field_cache == NULL) {
195 assert(!is_java_lang_Object(), "Object has no fields");
196 Arena* arena = CURRENT_ENV->arena();
197 _field_cache = new (arena) ciConstantPoolCache(arena, 5);
198 }
199 return _field_cache;
200 }
201
202 // ------------------------------------------------------------------
203 // ciInstanceKlass::get_canonical_holder
204 //
205 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
206 #ifdef ASSERT
207 if (!(offset >= 0 && offset < layout_helper())) {
208 tty->print("*** get_canonical_holder(%d) on ", offset);
209 this->print();
210 tty->print_cr(" ***");
211 };
212 assert(offset >= 0 && offset < layout_helper(), "offset must be tame");
213 #endif
214
215 if (offset < instanceOopDesc::base_offset_in_bytes()) {
216 // All header offsets belong properly to java/lang/Object.
217 return CURRENT_ENV->Object_klass();
218 }
219
220 ciInstanceKlass* self = this;
221 for (;;) {
222 assert(self->is_loaded(), "must be loaded to have size");
223 ciInstanceKlass* super = self->super();
224 if (super == NULL || super->nof_nonstatic_fields() == 0 ||
225 !super->contains_field_offset(offset)) {
226 return self;
227 } else {
228 self = super; // return super->get_canonical_holder(offset)
229 }
230 }
231 }
232
233 // ------------------------------------------------------------------
234 // ciInstanceKlass::is_java_lang_Object
235 //
236 // Is this klass java.lang.Object?
237 bool ciInstanceKlass::is_java_lang_Object() const {
238 return equals(CURRENT_ENV->Object_klass());
239 }
240
241 // ------------------------------------------------------------------
242 // ciInstanceKlass::uses_default_loader
243 bool ciInstanceKlass::uses_default_loader() const {
244 // Note: We do not need to resolve the handle or enter the VM
245 // in order to test null-ness.
246 return _loader == NULL;
247 }
248
249 // ------------------------------------------------------------------
250
251 /**
252 * Return basic type of boxed value for box klass or T_OBJECT if not.
253 */
254 BasicType ciInstanceKlass::box_klass_type() const {
255 if (uses_default_loader() && is_loaded()) {
256 return SystemDictionary::box_klass_type(get_Klass());
257 } else {
258 return T_OBJECT;
259 }
260 }
261
262 /**
263 * Is this boxing klass?
264 */
265 bool ciInstanceKlass::is_box_klass() const {
266 return is_java_primitive(box_klass_type());
267 }
268
269 /**
270 * Is this boxed value offset?
271 */
272 bool ciInstanceKlass::is_boxed_value_offset(int offset) const {
273 BasicType bt = box_klass_type();
274 return is_java_primitive(bt) &&
275 (offset == java_lang_boxing_object::value_offset_in_bytes(bt));
276 }
277
278 // ------------------------------------------------------------------
279 // ciInstanceKlass::is_in_package
280 //
281 // Is this klass in the given package?
282 bool ciInstanceKlass::is_in_package(const char* packagename, int len) {
283 // To avoid class loader mischief, this test always rejects application classes.
284 if (!uses_default_loader())
285 return false;
286 GUARDED_VM_ENTRY(
287 return is_in_package_impl(packagename, len);
288 )
289 }
290
291 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) {
292 ASSERT_IN_VM;
293
294 // If packagename contains trailing '/' exclude it from the
295 // prefix-test since we test for it explicitly.
296 if (packagename[len - 1] == '/')
297 len--;
298
299 if (!name()->starts_with(packagename, len))
300 return false;
301
302 // Test if the class name is something like "java/lang".
303 if ((len + 1) > name()->utf8_length())
304 return false;
305
306 // Test for trailing '/'
307 if (name()->char_at(len) != '/')
308 return false;
309
310 // Make sure it's not actually in a subpackage:
311 if (name()->index_of_at(len+1, "/", 1) >= 0)
312 return false;
313
314 return true;
315 }
316
317 // ------------------------------------------------------------------
318 // ciInstanceKlass::print_impl
319 //
320 // Implementation of the print method.
321 void ciInstanceKlass::print_impl(outputStream* st) {
322 ciKlass::print_impl(st);
323 GUARDED_VM_ENTRY(st->print(" loader=" INTPTR_FORMAT, p2i((address)loader()));)
324 if (is_loaded()) {
325 st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=",
326 bool_to_str(is_initialized()),
327 bool_to_str(has_finalizer()),
328 bool_to_str(has_subklass()),
329 layout_helper());
330
331 _flags.print_klass_flags();
332
333 if (_super) {
334 st->print(" super=");
335 _super->print_name();
336 }
337 if (_java_mirror) {
338 st->print(" mirror=PRESENT");
339 }
340 } else {
341 st->print(" loaded=false");
342 }
343 }
344
345 // ------------------------------------------------------------------
346 // ciInstanceKlass::super
347 //
348 // Get the superklass of this klass.
349 ciInstanceKlass* ciInstanceKlass::super() {
350 assert(is_loaded(), "must be loaded");
351 if (_super == NULL && !is_java_lang_Object()) {
352 GUARDED_VM_ENTRY(
353 Klass* super_klass = get_instanceKlass()->super();
354 _super = CURRENT_ENV->get_instance_klass(super_klass);
355 )
356 }
357 return _super;
358 }
359
360 // ------------------------------------------------------------------
361 // ciInstanceKlass::java_mirror
362 //
363 // Get the instance of java.lang.Class corresponding to this klass.
364 // Cache it on this->_java_mirror.
365 ciInstance* ciInstanceKlass::java_mirror() {
366 if (is_shared()) {
367 return ciKlass::java_mirror();
368 }
369 if (_java_mirror == NULL) {
370 _java_mirror = ciKlass::java_mirror();
371 }
372 return _java_mirror;
373 }
374
375 // ------------------------------------------------------------------
376 // ciInstanceKlass::unique_concrete_subklass
377 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
378 if (!is_loaded()) return NULL; // No change if class is not loaded
379 if (!is_abstract()) return NULL; // Only applies to abstract classes.
380 if (!has_subklass()) return NULL; // Must have at least one subklass.
381 VM_ENTRY_MARK;
382 InstanceKlass* ik = get_instanceKlass();
383 Klass* up = ik->up_cast_abstract();
384 assert(up->is_instance_klass(), "must be InstanceKlass");
385 if (ik == up) {
386 return NULL;
387 }
388 return CURRENT_THREAD_ENV->get_instance_klass(up);
389 }
390
391 // ------------------------------------------------------------------
392 // ciInstanceKlass::has_finalizable_subclass
393 bool ciInstanceKlass::has_finalizable_subclass() {
394 if (!is_loaded()) return true;
395 VM_ENTRY_MARK;
396 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL;
397 }
398
399 // ------------------------------------------------------------------
400 // ciInstanceKlass::get_field_by_offset
401 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
402 if (!is_static) {
403 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
404 ciField* field = _nonstatic_fields->at(i);
405 int field_off = field->offset_in_bytes();
406 if (field_off == field_offset)
407 return field;
408 if (field_off > field_offset)
409 break;
410 // could do binary search or check bins, but probably not worth it
411 }
412 return NULL;
413 }
414 VM_ENTRY_MARK;
415 InstanceKlass* k = get_instanceKlass();
416 fieldDescriptor fd;
417 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
418 return NULL;
419 }
420 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
421 return field;
422 }
423
424 ciField* ciInstanceKlass::get_non_flattened_field_by_offset(int field_offset) {
425 if (super() != NULL && super()->has_nonstatic_fields()) {
426 ciField* f = super()->get_non_flattened_field_by_offset(field_offset);
427 if (f != NULL) {
428 return f;
429 }
430 }
431
432 VM_ENTRY_MARK;
433 InstanceKlass* k = get_instanceKlass();
434 Arena* arena = CURRENT_ENV->arena();
435 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
436 if (fs.access_flags().is_static()) continue;
437 fieldDescriptor& fd = fs.field_descriptor();
438 if (fd.offset() == field_offset) {
439 ciField* f = new (arena) ciField(&fd);
440 return f;
441 }
442 }
443
444 return NULL;
445 }
446
447 // ------------------------------------------------------------------
448 // ciInstanceKlass::get_field_by_name
449 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
450 VM_ENTRY_MARK;
451 InstanceKlass* k = get_instanceKlass();
452 fieldDescriptor fd;
453 Klass* def = k->find_field(name->get_symbol(), signature->get_symbol(), is_static, &fd);
454 if (def == NULL) {
455 return NULL;
456 }
457 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
458 return field;
459 }
460
461
462 static int sort_field_by_offset(ciField** a, ciField** b) {
463 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
464 // (no worries about 32-bit overflow...)
465 }
466
467 // ------------------------------------------------------------------
468 // ciInstanceKlass::compute_nonstatic_fields
469 int ciInstanceKlass::compute_nonstatic_fields() {
470 assert(is_loaded(), "must be loaded");
471
472 if (_nonstatic_fields != NULL)
473 return _nonstatic_fields->length();
474
475 if (!has_nonstatic_fields()) {
476 Arena* arena = CURRENT_ENV->arena();
477 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL);
478 return 0;
479 }
480 assert(!is_java_lang_Object(), "bootstrap OK");
481
482 // Size in bytes of my fields, including inherited fields.
483 int fsize = nonstatic_field_size() * heapOopSize;
484
485 ciInstanceKlass* super = this->super();
486 GrowableArray<ciField*>* super_fields = NULL;
487 if (super != NULL && super->has_nonstatic_fields()) {
488 int super_fsize = super->nonstatic_field_size() * heapOopSize;
489 int super_flen = super->nof_nonstatic_fields();
490 super_fields = super->_nonstatic_fields;
491 assert(super_flen == 0 || super_fields != NULL, "first get nof_fields");
492 // See if I am no larger than my super; if so, I can use his fields.
493 if (fsize == super_fsize) {
494 _nonstatic_fields = super_fields;
495 return super_fields->length();
496 }
497 }
498
499 GrowableArray<ciField*>* fields = NULL;
500 GUARDED_VM_ENTRY({
501 fields = compute_nonstatic_fields_impl(super_fields);
502 });
503
504 if (fields == NULL) {
505 // This can happen if this class (java.lang.Class) has invisible fields.
506 if (super_fields != NULL) {
507 _nonstatic_fields = super_fields;
508 return super_fields->length();
509 } else {
510 return 0;
511 }
512 }
513
514 _nonstatic_fields = fields;
515 return fields->length();
516 }
517
518 GrowableArray<ciField*>* ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields, bool flatten) {
519 ASSERT_IN_VM;
520 Arena* arena = CURRENT_ENV->arena();
521 int flen = 0;
522 GrowableArray<ciField*>* fields = NULL;
523 InstanceKlass* k = get_instanceKlass();
524 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
525 if (fs.access_flags().is_static()) continue;
526 flen += 1;
527 }
528
529 // allocate the array:
530 if (flen == 0) {
531 return NULL; // return nothing if none are locally declared
532 }
533 if (super_fields != NULL) {
534 flen += super_fields->length();
535 }
536
537 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL);
538 if (super_fields != NULL) {
539 fields->appendAll(super_fields);
540 }
541
542 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
543 if (fs.access_flags().is_static()) continue;
544 fieldDescriptor& fd = fs.field_descriptor();
545 if (fd.is_flattened() && flatten) {
546 // Value type fields are embedded
547 int field_offset = fd.offset();
548 // Get ValueKlass and adjust number of fields
549 Klass* k = get_instanceKlass()->get_value_field_klass(fd.index());
550 ciValueKlass* vk = CURRENT_ENV->get_klass(k)->as_value_klass();
551 flen += vk->nof_nonstatic_fields() - 1;
552 // Iterate over fields of the flattened value type and copy them to 'this'
553 for (int i = 0; i < vk->nof_nonstatic_fields(); ++i) {
554 ciField* flattened_field = vk->nonstatic_field_at(i);
555 // Adjust offset to account for missing oop header
556 int offset = field_offset + (flattened_field->offset() - vk->first_field_offset());
557 // A flattened field can be treated as final if the non-flattened
558 // field is declared final or the holder klass is a value type itself.
559 bool is_final = fd.is_final() || is_valuetype();
560 ciField* field = new (arena) ciField(flattened_field, this, offset, is_final);
561 fields->append(field);
562 }
563 } else {
564 ciField* field = new (arena) ciField(&fd);
565 fields->append(field);
566 }
567 }
568 assert(fields->length() == flen, "sanity");
569 // Now sort them by offset, ascending.
570 // (In principle, they could mix with superclass fields.)
571 fields->sort(sort_field_by_offset);
572 return fields;
573 }
574
575 bool ciInstanceKlass::compute_injected_fields_helper() {
576 ASSERT_IN_VM;
577 InstanceKlass* k = get_instanceKlass();
578
579 for (InternalFieldStream fs(k); !fs.done(); fs.next()) {
580 if (fs.access_flags().is_static()) continue;
581 return true;
582 }
583 return false;
584 }
585
586 void ciInstanceKlass::compute_injected_fields() {
587 assert(is_loaded(), "must be loaded");
588
589 int has_injected_fields = 0;
590 if (super() != NULL && super()->has_injected_fields()) {
591 has_injected_fields = 1;
592 } else {
593 GUARDED_VM_ENTRY({
594 has_injected_fields = compute_injected_fields_helper() ? 1 : 0;
595 });
596 }
597 // may be concurrently initialized for shared ciInstanceKlass objects
598 assert(_has_injected_fields == -1 || _has_injected_fields == has_injected_fields, "broken concurrent initialization");
599 _has_injected_fields = has_injected_fields;
600 }
601
602 bool ciInstanceKlass::has_object_fields() const {
603 GUARDED_VM_ENTRY(
604 return get_instanceKlass()->nonstatic_oop_map_size() > 0;
605 );
606 }
607
608 // ------------------------------------------------------------------
609 // ciInstanceKlass::find_method
610 //
611 // Find a method in this klass.
612 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
613 VM_ENTRY_MARK;
614 InstanceKlass* k = get_instanceKlass();
615 Symbol* name_sym = name->get_symbol();
616 Symbol* sig_sym= signature->get_symbol();
617
618 Method* m = k->find_method(name_sym, sig_sym);
619 if (m == NULL) return NULL;
620
621 return CURRENT_THREAD_ENV->get_method(m);
622 }
623
624 // ------------------------------------------------------------------
625 // ciInstanceKlass::is_leaf_type
626 bool ciInstanceKlass::is_leaf_type() {
627 assert(is_loaded(), "must be loaded");
628 if (is_shared()) {
629 return is_final(); // approximately correct
630 } else {
631 return !has_subklass() && (nof_implementors() == 0);
632 }
633 }
634
635 // ------------------------------------------------------------------
636 // ciInstanceKlass::implementor
637 //
638 // Report an implementor of this interface.
639 // Note that there are various races here, since my copy
640 // of _nof_implementors might be out of date with respect
641 // to results returned by InstanceKlass::implementor.
642 // This is OK, since any dependencies we decide to assert
643 // will be checked later under the Compile_lock.
644 ciInstanceKlass* ciInstanceKlass::implementor() {
645 ciInstanceKlass* impl = _implementor;
646 if (impl == NULL) {
647 // Go into the VM to fetch the implementor.
648 {
649 VM_ENTRY_MARK;
650 MutexLocker ml(Compile_lock);
651 Klass* k = get_instanceKlass()->implementor();
652 if (k != NULL) {
653 if (k == get_instanceKlass()) {
654 // More than one implementors. Use 'this' in this case.
655 impl = this;
656 } else {
657 impl = CURRENT_THREAD_ENV->get_instance_klass(k);
658 }
659 }
660 }
661 // Memoize this result.
662 if (!is_shared()) {
663 _implementor = impl;
664 }
665 }
666 return impl;
667 }
668
669 ciInstanceKlass* ciInstanceKlass::unsafe_anonymous_host() {
670 assert(is_loaded(), "must be loaded");
671 if (is_unsafe_anonymous()) {
672 VM_ENTRY_MARK
673 Klass* unsafe_anonymous_host = get_instanceKlass()->unsafe_anonymous_host();
674 return CURRENT_ENV->get_instance_klass(unsafe_anonymous_host);
675 }
676 return NULL;
677 }
678
679 ciInstanceKlass* ciInstanceKlass::vcc_klass() {
680 return NULL;
681 }
682
683 // Utility class for printing of the contents of the static fields for
684 // use by compilation replay. It only prints out the information that
685 // could be consumed by the compiler, so for primitive types it prints
686 // out the actual value. For Strings it's the actual string value.
687 // For array types it it's first level array size since that's the
688 // only value which statically unchangeable. For all other reference
689 // types it simply prints out the dynamic type.
690
691 class StaticFieldPrinter : public FieldClosure {
692 protected:
693 outputStream* _out;
694 public:
695 StaticFieldPrinter(outputStream* out) :
696 _out(out) {
697 }
698 void do_field_helper(fieldDescriptor* fd, oop obj, bool flattened);
699 };
700
701 class StaticFinalFieldPrinter : public StaticFieldPrinter {
702 const char* _holder;
703 public:
704 StaticFinalFieldPrinter(outputStream* out, const char* holder) :
705 StaticFieldPrinter(out), _holder(holder) {
706 }
707 void do_field(fieldDescriptor* fd) {
708 if (fd->is_final() && !fd->has_initial_value()) {
709 ResourceMark rm;
710 InstanceKlass* holder = fd->field_holder();
711 oop mirror = holder->java_mirror();
712 _out->print("staticfield %s %s ", _holder, fd->name()->as_quoted_ascii());
713 BasicType bt = fd->field_type();
714 if (bt != T_OBJECT && bt != T_ARRAY) {
715 _out->print("%s ", fd->signature()->as_quoted_ascii());
716 }
717 do_field_helper(fd, mirror, false);
718 _out->cr();
719 }
720 }
721 };
722
723 class ValueTypeFieldPrinter : public StaticFieldPrinter {
724 oop _obj;
725 public:
726 ValueTypeFieldPrinter(outputStream* out, oop obj) :
727 StaticFieldPrinter(out), _obj(obj) {
728 }
729 void do_field(fieldDescriptor* fd) {
730 do_field_helper(fd, _obj, true);
731 _out->print(" ");
732 }
733 };
734
735 void StaticFieldPrinter::do_field_helper(fieldDescriptor* fd, oop mirror, bool flattened) {
736 BasicType bt = fd->field_type();
737 switch (bt) {
738 case T_BYTE: _out->print("%d", mirror->byte_field(fd->offset())); break;
739 case T_BOOLEAN: _out->print("%d", mirror->bool_field(fd->offset())); break;
740 case T_SHORT: _out->print("%d", mirror->short_field(fd->offset())); break;
741 case T_CHAR: _out->print("%d", mirror->char_field(fd->offset())); break;
742 case T_INT: _out->print("%d", mirror->int_field(fd->offset())); break;
743 case T_LONG: _out->print(INT64_FORMAT, (int64_t)(mirror->long_field(fd->offset()))); break;
744 case T_FLOAT: {
745 float f = mirror->float_field(fd->offset());
746 _out->print("%d", *(int*)&f);
747 break;
748 }
749 case T_DOUBLE: {
750 double d = mirror->double_field(fd->offset());
751 _out->print(INT64_FORMAT, *(int64_t*)&d);
752 break;
753 }
754 case T_ARRAY: // fall-through
755 case T_OBJECT: {
756 _out->print("%s ", fd->signature()->as_quoted_ascii());
757 oop value = mirror->obj_field_acquire(fd->offset());
758 if (value == NULL) {
759 _out->print_cr("null");
760 } else if (value->is_instance()) {
761 assert(fd->field_type() == T_OBJECT, "");
762 if (value->is_a(SystemDictionary::String_klass())) {
763 const char* ascii_value = java_lang_String::as_quoted_ascii(value);
764 _out->print("\"%s\"", (ascii_value != NULL) ? ascii_value : "");
765 } else {
766 const char* klass_name = value->klass()->name()->as_quoted_ascii();
767 _out->print("%s", klass_name);
768 }
769 } else if (value->is_array()) {
770 typeArrayOop ta = (typeArrayOop)value;
771 _out->print("%d", ta->length());
772 if (value->is_objArray() || value->is_valueArray()) {
773 objArrayOop oa = (objArrayOop)value;
774 const char* klass_name = value->klass()->name()->as_quoted_ascii();
775 _out->print(" %s", klass_name);
776 }
777 } else {
778 ShouldNotReachHere();
779 }
780 break;
781 }
782 case T_VALUETYPE: {
783 ResetNoHandleMark rnhm;
784 Thread* THREAD = Thread::current();
785 SignatureStream ss(fd->signature(), false);
786 Symbol* name = ss.as_symbol();
787 assert(!HAS_PENDING_EXCEPTION, "can resolve klass?");
788 InstanceKlass* holder = fd->field_holder();
789 Klass* k = SystemDictionary::find(name, Handle(THREAD, holder->class_loader()),
790 Handle(THREAD, holder->protection_domain()), THREAD);
791 assert(k != NULL && !HAS_PENDING_EXCEPTION, "can resolve klass?");
792 ValueKlass* vk = ValueKlass::cast(k);
793 oop obj;
794 if (flattened) {
795 int field_offset = fd->offset() - vk->first_field_offset();
796 obj = (oop)((address)mirror + field_offset);
797 } else {
798 obj = mirror->obj_field_acquire(fd->offset());
799 }
800 ValueTypeFieldPrinter print_field(_out, obj);
801 vk->do_nonstatic_fields(&print_field);
802 break;
803 }
804 default:
805 ShouldNotReachHere();
806 }
807 }
808
809
810 void ciInstanceKlass::dump_replay_data(outputStream* out) {
811 ResourceMark rm;
812
813 InstanceKlass* ik = get_instanceKlass();
814 ConstantPool* cp = ik->constants();
815
816 // Try to record related loaded classes
817 Klass* sub = ik->subklass();
818 while (sub != NULL) {
819 if (sub->is_instance_klass()) {
820 out->print_cr("instanceKlass %s", sub->name()->as_quoted_ascii());
821 }
822 sub = sub->next_sibling();
823 }
824
825 // Dump out the state of the constant pool tags. During replay the
826 // tags will be validated for things which shouldn't change and
827 // classes will be resolved if the tags indicate that they were
828 // resolved at compile time.
829 out->print("ciInstanceKlass %s %d %d %d", ik->name()->as_quoted_ascii(),
830 is_linked(), is_initialized(), cp->length());
831 for (int index = 1; index < cp->length(); index++) {
832 out->print(" %d", cp->tags()->at(index));
833 }
834 out->cr();
835 if (is_initialized()) {
836 // Dump out the static final fields in case the compilation relies
837 // on their value for correct replay.
838 StaticFinalFieldPrinter sffp(out, ik->name()->as_quoted_ascii());
839 ik->do_local_static_fields(&sffp);
840 }
841 }
842
843 #ifdef ASSERT
844 bool ciInstanceKlass::debug_final_field_at(int offset) {
845 GUARDED_VM_ENTRY(
846 InstanceKlass* ik = get_instanceKlass();
847 fieldDescriptor fd;
848 if (ik->find_field_from_offset(offset, false, &fd)) {
849 return fd.is_final();
850 }
851 );
852 return false;
853 }
854
855 bool ciInstanceKlass::debug_stable_field_at(int offset) {
856 GUARDED_VM_ENTRY(
857 InstanceKlass* ik = get_instanceKlass();
858 fieldDescriptor fd;
859 if (ik->find_field_from_offset(offset, false, &fd)) {
860 return fd.is_stable();
861 }
862 );
863 return false;
864 }
865 #endif