1 /*
2 * Copyright (c) 1999, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "ci/ciCallSite.hpp"
26 #include "ci/ciInstance.hpp"
27 #include "ci/ciInstanceKlass.hpp"
28 #include "ci/ciMemberName.hpp"
29 #include "ci/ciMethod.hpp"
30 #include "ci/ciMethodData.hpp"
31 #include "ci/ciMethodHandle.hpp"
32 #include "ci/ciMethodType.hpp"
33 #include "ci/ciNullObject.hpp"
34 #include "ci/ciObjArray.hpp"
35 #include "ci/ciObjArrayKlass.hpp"
36 #include "ci/ciObject.hpp"
37 #include "ci/ciObjectFactory.hpp"
38 #include "ci/ciReplay.hpp"
39 #include "ci/ciSymbol.hpp"
40 #include "ci/ciSymbols.hpp"
41 #include "ci/ciTypeArray.hpp"
42 #include "ci/ciTypeArrayKlass.hpp"
43 #include "ci/ciUtilities.inline.hpp"
44 #include "classfile/javaClasses.inline.hpp"
45 #include "classfile/vmClasses.hpp"
46 #include "compiler/compiler_globals.hpp"
47 #include "gc/shared/collectedHeap.inline.hpp"
48 #include "memory/allocation.inline.hpp"
49 #include "memory/universe.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "runtime/handles.inline.hpp"
52 #include "runtime/signature.hpp"
53 #include "utilities/macros.hpp"
54
55 // ciObjectFactory
56 //
57 // This class handles requests for the creation of new instances
58 // of ciObject and its subclasses. It contains a caching mechanism
59 // which ensures that for each oop, at most one ciObject is created.
60 // This invariant allows more efficient implementation of ciObject.
61 //
62 // Implementation note: the oop->ciObject mapping is represented as
63 // a table stored in an array. Even though objects are moved
64 // by the garbage collector, the compactor preserves their relative
65 // order; address comparison of oops (in perm space) is safe so long
66 // as we prohibit GC during our comparisons. We currently use binary
67 // search to find the oop in the table, and inserting a new oop
68 // into the table may be costly. If this cost ends up being
69 // problematic the underlying data structure can be switched to some
70 // sort of balanced binary tree.
71
72 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = nullptr;
73 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::number_of_symbols()];
74 int ciObjectFactory::_shared_ident_limit = 0;
75 volatile bool ciObjectFactory::_initialized = false;
76
77
78 // ------------------------------------------------------------------
79 // ciObjectFactory::ciObjectFactory
80 ciObjectFactory::ciObjectFactory(Arena* arena,
81 int expected_size)
82 : _arena(arena),
83 _ci_metadata(arena, expected_size, 0, nullptr),
84 _unloaded_methods(arena, 4, 0, nullptr),
85 _unloaded_klasses(arena, 8, 0, nullptr),
86 _unloaded_instances(arena, 4, 0, nullptr),
87 _return_addresses(arena, 8, 0, nullptr),
88 _symbols(arena, 100, 0, nullptr),
89 _next_ident(_shared_ident_limit),
90 _non_perm_count(0) {
91 for (int i = 0; i < NON_PERM_BUCKETS; i++) {
92 _non_perm_bucket[i] = nullptr;
93 }
94
95 // If the shared ci objects exist append them to this factory's objects
96 if (_shared_ci_metadata != nullptr) {
97 _ci_metadata.appendAll(_shared_ci_metadata);
98 }
99 }
100
101 // ------------------------------------------------------------------
102 // ciObjectFactory::ciObjectFactory
103 void ciObjectFactory::initialize() {
104 ASSERT_IN_VM;
105 JavaThread* thread = JavaThread::current();
106 HandleMark handle_mark(thread);
107
108 // This Arena is long lived and exists in the resource mark of the
109 // compiler thread that initializes the initial ciObjectFactory which
110 // creates the shared ciObjects that all later ciObjectFactories use.
111 Arena* arena = new (mtCompiler) Arena(mtCompiler, Arena::Tag::tag_cienv);
112 ciEnv initial(arena);
113 ciEnv* env = ciEnv::current();
114 env->_factory->init_shared_objects();
115
116 _initialized = true;
117
118 }
119
120 void ciObjectFactory::init_shared_objects() {
121
122 _next_ident = 1; // start numbering CI objects at 1
123
124 {
125 // Create the shared symbols, but not in _shared_ci_metadata.
126 for (auto index : EnumRange<vmSymbolID>{}) {
127 Symbol* vmsym = vmSymbols::symbol_at(index);
128 assert(vmSymbols::find_sid(vmsym) == index, "1-1 mapping");
129 ciSymbol* sym = new (_arena) ciSymbol(vmsym, index);
130 init_ident_of(sym);
131 _shared_ci_symbols[vmSymbols::as_int(index)] = sym;
132 }
133 #ifdef ASSERT
134 for (auto index : EnumRange<vmSymbolID>{}) {
135 Symbol* vmsym = vmSymbols::symbol_at(index);
136 ciSymbol* sym = vm_symbol_at(index);
137 assert(sym->get_symbol() == vmsym, "oop must match");
138 }
139 assert(ciSymbols::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
140 #endif
141 }
142
143 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
144 BasicType t = (BasicType)i;
145 if (type2name(t) != nullptr && !is_reference_type(t) &&
146 t != T_NARROWOOP && t != T_NARROWKLASS) {
147 ciType::_basic_types[t] = new (_arena) ciType(t);
148 init_ident_of(ciType::_basic_types[t]);
149 }
150 }
151
152 ciEnv::_null_object_instance = new (_arena) ciNullObject();
153 init_ident_of(ciEnv::_null_object_instance);
154
155 #define VM_CLASS_DEFN(name, ignore_s) \
156 if (vmClasses::name##_is_loaded()) \
157 ciEnv::_##name = get_metadata(vmClasses::name())->as_instance_klass();
158
159 VM_CLASSES_DO(VM_CLASS_DEFN)
160 #undef VM_CLASS_DEFN
161
162 for (int len = -1; len != _ci_metadata.length(); ) {
163 len = _ci_metadata.length();
164 for (int i2 = 0; i2 < len; i2++) {
165 ciMetadata* obj = _ci_metadata.at(i2);
166 assert (obj->is_metadata(), "what else would it be?");
167 if (obj->is_loaded() && obj->is_instance_klass()) {
168 obj->as_instance_klass()->compute_nonstatic_fields();
169 obj->as_instance_klass()->transitive_interfaces();
170 }
171 }
172 }
173
174 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol());
175 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents
176 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, nullptr);
177 init_ident_of(ciEnv::_unloaded_ciinstance_klass);
178 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
179 init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
180 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
181
182 get_metadata(Universe::boolArrayKlass());
183 get_metadata(Universe::charArrayKlass());
184 get_metadata(Universe::floatArrayKlass());
185 get_metadata(Universe::doubleArrayKlass());
186 get_metadata(Universe::byteArrayKlass());
187 get_metadata(Universe::shortArrayKlass());
188 get_metadata(Universe::intArrayKlass());
189 get_metadata(Universe::longArrayKlass());
190
191 assert(_non_perm_count == 0, "no shared non-perm objects");
192
193 // The shared_ident_limit is the first ident number that will
194 // be used for non-shared objects. That is, numbers less than
195 // this limit are permanently assigned to shared CI objects,
196 // while the higher numbers are recycled afresh by each new ciEnv.
197
198 _shared_ident_limit = _next_ident;
199 _shared_ci_metadata = &_ci_metadata;
200 }
201
202
203 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) {
204 vmSymbolID sid = vmSymbols::find_sid(key);
205 if (sid != vmSymbolID::NO_SID) {
206 // do not pollute the main cache with it
207 return vm_symbol_at(sid);
208 }
209
210 assert(vmSymbols::find_sid(key) == vmSymbolID::NO_SID, "");
211 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbolID::NO_SID);
212 _symbols.push(s);
213 return s;
214 }
215
216 // Decrement the refcount when done on symbols referenced by this compilation.
217 void ciObjectFactory::remove_symbols() {
218 for (int i = 0; i < _symbols.length(); i++) {
219 ciSymbol* s = _symbols.at(i);
220 s->get_symbol()->decrement_refcount();
221 }
222 // Since _symbols is resource allocated we're not allowed to delete it
223 // but it'll go away just the same.
224 }
225
226 // ------------------------------------------------------------------
227 // ciObjectFactory::get
228 //
229 // Get the ciObject corresponding to some oop. If the ciObject has
230 // already been created, it is returned. Otherwise, a new ciObject
231 // is created.
232 ciObject* ciObjectFactory::get(oop key) {
233 ASSERT_IN_VM;
234
235 assert(Universe::heap()->is_in(key), "must be");
236
237 NonPermObject* &bucket = find_non_perm(key);
238 if (bucket != nullptr) {
239 return bucket->object();
240 }
241
242 // The ciObject does not yet exist. Create it and insert it
243 // into the cache.
244 Handle keyHandle(Thread::current(), key);
245 ciObject* new_object = create_new_object(keyHandle());
246 assert(keyHandle() == new_object->get_oop(), "must be properly recorded");
247 init_ident_of(new_object);
248 assert(Universe::heap()->is_in(new_object->get_oop()), "must be");
249
250 // Not a perm-space object.
251 insert_non_perm(bucket, keyHandle(), new_object);
252 return new_object;
253 }
254
255 int ciObjectFactory::metadata_compare(Metadata* const& key, ciMetadata* const& elt) {
256 Metadata* value = elt->constant_encoding();
257 if (key < value) return -1;
258 else if (key > value) return 1;
259 else return 0;
260 }
261
262 // ------------------------------------------------------------------
263 // ciObjectFactory::cached_metadata
264 //
265 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
266 // already been created, it is returned. Otherwise, null is returned.
267 ciMetadata* ciObjectFactory::cached_metadata(Metadata* key) {
268 ASSERT_IN_VM;
269
270 bool found = false;
271 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
272
273 if (!found) {
274 return nullptr;
275 }
276 return _ci_metadata.at(index)->as_metadata();
277 }
278
279
280 // ------------------------------------------------------------------
281 // ciObjectFactory::get_metadata
282 //
283 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
284 // already been created, it is returned. Otherwise, a new ciMetadata
285 // is created.
286 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
287 ASSERT_IN_VM;
288
289 if (ReplayCompiles && key->is_klass()) {
290 Klass* k = (Klass*)key;
291 if (k->is_instance_klass() && ciReplay::is_klass_unresolved((InstanceKlass*)k)) {
292 // Klass was unresolved at replay dump time. Simulate this case.
293 return ciEnv::_unloaded_ciinstance_klass;
294 }
295 }
296
297 #ifdef ASSERT
298 if (CIObjectFactoryVerify) {
299 Metadata* last = nullptr;
300 for (int j = 0; j < _ci_metadata.length(); j++) {
301 Metadata* o = _ci_metadata.at(j)->constant_encoding();
302 assert(last < o, "out of order");
303 last = o;
304 }
305 }
306 #endif // ASSERT
307 int len = _ci_metadata.length();
308 bool found = false;
309 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
310 #ifdef ASSERT
311 if (CIObjectFactoryVerify) {
312 for (int i = 0; i < _ci_metadata.length(); i++) {
313 if (_ci_metadata.at(i)->constant_encoding() == key) {
314 assert(index == i, " bad lookup");
315 }
316 }
317 }
318 #endif
319
320 if (!found) {
321 // The ciMetadata does not yet exist. Create it and insert it
322 // into the cache.
323 ciMetadata* new_object = create_new_metadata(key);
324 init_ident_of(new_object);
325 assert(new_object->is_metadata(), "must be");
326
327 if (len != _ci_metadata.length()) {
328 // creating the new object has recursively entered new objects
329 // into the table. We need to recompute our index.
330 index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
331 }
332 assert(!found, "no double insert");
333 _ci_metadata.insert_before(index, new_object);
334 return new_object;
335 }
336 return _ci_metadata.at(index)->as_metadata();
337 }
338
339 // ------------------------------------------------------------------
340 // ciObjectFactory::create_new_object
341 //
342 // Create a new ciObject from an oop.
343 //
344 // Implementation note: this functionality could be virtual behavior
345 // of the oop itself. For now, we explicitly marshal the object.
346 ciObject* ciObjectFactory::create_new_object(oop o) {
347 EXCEPTION_CONTEXT;
348
349 if (o->is_instance()) {
350 instanceHandle h_i(THREAD, (instanceOop)o);
351 if (java_lang_invoke_CallSite::is_instance(o))
352 return new (arena()) ciCallSite(h_i);
353 else if (java_lang_invoke_MemberName::is_instance(o))
354 return new (arena()) ciMemberName(h_i);
355 else if (java_lang_invoke_MethodHandle::is_instance(o))
356 return new (arena()) ciMethodHandle(h_i);
357 else if (java_lang_invoke_MethodType::is_instance(o))
358 return new (arena()) ciMethodType(h_i);
359 else
360 return new (arena()) ciInstance(h_i);
361 } else if (o->is_objArray()) {
362 objArrayHandle h_oa(THREAD, (objArrayOop)o);
363 return new (arena()) ciObjArray(h_oa);
364 } else if (o->is_typeArray()) {
365 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
366 return new (arena()) ciTypeArray(h_ta);
367 }
368
369 // The oop is of some type not supported by the compiler interface.
370 ShouldNotReachHere();
371 return nullptr;
372 }
373
374 // ------------------------------------------------------------------
375 // ciObjectFactory::create_new_metadata
376 //
377 // Create a new ciMetadata from a Metadata*.
378 //
379 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
380 // is used, which points to it's holder.
381 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
382 EXCEPTION_CONTEXT;
383
384 if (o->is_klass()) {
385 Klass* k = (Klass*)o;
386 if (k->is_instance_klass()) {
387 assert(!ReplayCompiles || ciReplay::no_replay_state() || !ciReplay::is_klass_unresolved((InstanceKlass*)k), "must be whitelisted for replay compilation");
388 return new (arena()) ciInstanceKlass(k);
389 } else if (k->is_objArray_klass()) {
390 return new (arena()) ciObjArrayKlass(k);
391 } else if (k->is_typeArray_klass()) {
392 return new (arena()) ciTypeArrayKlass(k);
393 }
394 } else if (o->is_method()) {
395 methodHandle h_m(THREAD, (Method*)o);
396 ciEnv *env = CURRENT_THREAD_ENV;
397 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
398 return new (arena()) ciMethod(h_m, holder);
399 } else if (o->is_methodData()) {
400 // Hold methodHandle alive - might not be necessary ???
401 methodHandle h_m(THREAD, ((MethodData*)o)->method());
402 return new (arena()) ciMethodData((MethodData*)o);
403 }
404
405 // The Metadata* is of some type not supported by the compiler interface.
406 ShouldNotReachHere();
407 return nullptr;
408 }
409
410 //------------------------------------------------------------------
411 // ciObjectFactory::get_unloaded_method
412 //
413 // Get the ciMethod representing an unloaded/unfound method.
414 //
415 // Implementation note: unloaded methods are currently stored in
416 // an unordered array, requiring a linear-time lookup for each
417 // unloaded method. This may need to change.
418 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
419 ciSymbol* name,
420 ciSymbol* signature,
421 ciInstanceKlass* accessor) {
422 assert(accessor != nullptr, "need origin of access");
423 ciSignature* that = nullptr;
424 for (int i = 0; i < _unloaded_methods.length(); i++) {
425 ciMethod* entry = _unloaded_methods.at(i);
426 if (entry->holder()->equals(holder) &&
427 entry->name()->equals(name) &&
428 entry->signature()->as_symbol()->equals(signature)) {
429 // Short-circuit slow resolve.
430 if (entry->signature()->accessing_klass() == accessor) {
431 // We've found a match.
432 return entry;
433 } else {
434 // Lazily create ciSignature
435 if (that == nullptr) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
436 if (entry->signature()->equals(that)) {
437 // We've found a match.
438 return entry;
439 }
440 }
441 }
442 }
443
444 // This is a new unloaded method. Create it and stick it in
445 // the cache.
446 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
447
448 init_ident_of(new_method);
449 _unloaded_methods.append(new_method);
450
451 return new_method;
452 }
453
454 //------------------------------------------------------------------
455 // ciObjectFactory::get_unloaded_klass
456 //
457 // Get a ciKlass representing an unloaded klass.
458 //
459 // Implementation note: unloaded klasses are currently stored in
460 // an unordered array, requiring a linear-time lookup for each
461 // unloaded klass. This may need to change.
462 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
463 ciSymbol* name,
464 bool create_if_not_found) {
465 EXCEPTION_CONTEXT;
466 oop loader = nullptr;
467 oop domain = nullptr;
468 if (accessing_klass != nullptr) {
469 loader = accessing_klass->loader();
470 }
471 for (int i = 0; i < _unloaded_klasses.length(); i++) {
472 ciKlass* entry = _unloaded_klasses.at(i);
473 if (entry->name()->equals(name) &&
474 entry->loader() == loader) {
475 // We've found a match.
476 return entry;
477 }
478 }
479
480 if (!create_if_not_found)
481 return nullptr;
482
483 // This is a new unloaded klass. Create it and stick it in
484 // the cache.
485 ciKlass* new_klass = nullptr;
486
487 // Two cases: this is an unloaded ObjArrayKlass or an
488 // unloaded InstanceKlass. Deal with both.
489 if (name->char_at(0) == JVM_SIGNATURE_ARRAY) {
490 // Decompose the name.'
491 SignatureStream ss(name->get_symbol(), false);
492 int dimension = ss.skip_array_prefix(); // skip all '['s
493 BasicType element_type = ss.type();
494 assert(element_type != T_ARRAY, "unsuccessful decomposition");
495 ciKlass* element_klass = nullptr;
496 if (element_type == T_OBJECT) {
497 ciEnv *env = CURRENT_THREAD_ENV;
498 ciSymbol* ci_name = env->get_symbol(ss.as_symbol());
499 element_klass =
500 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
501 } else {
502 assert(dimension > 1, "one dimensional type arrays are always loaded.");
503
504 // The type array itself takes care of one of the dimensions.
505 dimension--;
506
507 // The element klass is a TypeArrayKlass.
508 element_klass = ciTypeArrayKlass::make(element_type);
509 }
510 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
511 } else {
512 jobject loader_handle = nullptr;
513 if (accessing_klass != nullptr) {
514 loader_handle = accessing_klass->loader_handle();
515 }
516 new_klass = new (arena()) ciInstanceKlass(name, loader_handle);
517 }
518 init_ident_of(new_klass);
519 _unloaded_klasses.append(new_klass);
520
521 return new_klass;
522 }
523
524
525 //------------------------------------------------------------------
526 // ciObjectFactory::get_unloaded_instance
527 //
528 // Get a ciInstance representing an as-yet undetermined instance of a given class.
529 //
530 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
531 for (int i = 0; i < _unloaded_instances.length(); i++) {
532 ciInstance* entry = _unloaded_instances.at(i);
533 if (entry->klass()->equals(instance_klass)) {
534 // We've found a match.
535 return entry;
536 }
537 }
538
539 // This is a new unloaded instance. Create it and stick it in
540 // the cache.
541 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
542
543 init_ident_of(new_instance);
544 _unloaded_instances.append(new_instance);
545
546 // make sure it looks the way we want:
547 assert(!new_instance->is_loaded(), "");
548 assert(new_instance->klass() == instance_klass, "");
549
550 return new_instance;
551 }
552
553
554 //------------------------------------------------------------------
555 // ciObjectFactory::get_unloaded_klass_mirror
556 //
557 // Get a ciInstance representing an unresolved klass mirror.
558 //
559 // Currently, this ignores the parameters and returns a unique unloaded instance.
560 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
561 assert(ciEnv::_Class_klass != nullptr, "");
562 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
563 }
564
565 //------------------------------------------------------------------
566 // ciObjectFactory::get_unloaded_method_handle_constant
567 //
568 // Get a ciInstance representing an unresolved method handle constant.
569 //
570 // Currently, this ignores the parameters and returns a unique unloaded instance.
571 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
572 ciSymbol* name,
573 ciSymbol* signature,
574 int ref_kind) {
575 assert(ciEnv::_MethodHandle_klass != nullptr, "");
576 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
577 }
578
579 //------------------------------------------------------------------
580 // ciObjectFactory::get_unloaded_method_type_constant
581 //
582 // Get a ciInstance representing an unresolved method type constant.
583 //
584 // Currently, this ignores the parameters and returns a unique unloaded instance.
585 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
586 assert(ciEnv::_MethodType_klass != nullptr, "");
587 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
588 }
589
590 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
591 assert(ciEnv::_Object_klass != nullptr, "");
592 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
593 }
594
595 //------------------------------------------------------------------
596 // ciObjectFactory::get_empty_methodData
597 //
598 // Get the ciMethodData representing the methodData for a method with
599 // none.
600 ciMethodData* ciObjectFactory::get_empty_methodData() {
601 ciMethodData* new_methodData = new (arena()) ciMethodData();
602 init_ident_of(new_methodData);
603 return new_methodData;
604 }
605
606 //------------------------------------------------------------------
607 // ciObjectFactory::get_return_address
608 //
609 // Get a ciReturnAddress for a specified bci.
610 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
611 for (int i = 0; i < _return_addresses.length(); i++) {
612 ciReturnAddress* entry = _return_addresses.at(i);
613 if (entry->bci() == bci) {
614 // We've found a match.
615 return entry;
616 }
617 }
618
619 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
620 init_ident_of(new_ret_addr);
621 _return_addresses.append(new_ret_addr);
622 return new_ret_addr;
623 }
624
625 // ------------------------------------------------------------------
626 // ciObjectFactory::init_ident_of
627 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
628 obj->set_ident(_next_ident++);
629 }
630
631 static ciObjectFactory::NonPermObject* emptyBucket = nullptr;
632
633 // ------------------------------------------------------------------
634 // ciObjectFactory::find_non_perm
635 //
636 // Use a small hash table, hashed on the klass of the key.
637 // If there is no entry in the cache corresponding to this oop, return
638 // the null tail of the bucket into which the oop should be inserted.
639 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
640 assert(Universe::heap()->is_in(key), "must be");
641 ciMetadata* klass = get_metadata(key->klass());
642 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
643 for (NonPermObject* p; (p = (*bp)) != nullptr; bp = &p->next()) {
644 if (is_equal(p, key)) break;
645 }
646 return (*bp);
647 }
648
649
650
651 // ------------------------------------------------------------------
652 // Code for for NonPermObject
653 //
654 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
655 assert(ciObjectFactory::is_initialized(), "");
656 _object = object;
657 _next = bucket;
658 bucket = this;
659 }
660
661
662
663 // ------------------------------------------------------------------
664 // ciObjectFactory::insert_non_perm
665 //
666 // Insert a ciObject into the non-perm table.
667 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
668 assert(Universe::heap()->is_in_or_null(key), "must be");
669 assert(&where != &emptyBucket, "must not try to fill empty bucket");
670 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
671 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
672 assert(find_non_perm(key) == p, "must find the same spot");
673 ++_non_perm_count;
674 }
675
676 // ------------------------------------------------------------------
677 // ciObjectFactory::vm_symbol_at
678 // Get the ciSymbol corresponding to some index in vmSymbols.
679 ciSymbol* ciObjectFactory::vm_symbol_at(vmSymbolID sid) {
680 int index = vmSymbols::as_int(sid);
681 return _shared_ci_symbols[index];
682 }
683
684 // ------------------------------------------------------------------
685 // ciObjectFactory::metadata_do
686 void ciObjectFactory::metadata_do(MetadataClosure* f) {
687 for (int j = 0; j < _ci_metadata.length(); j++) {
688 Metadata* o = _ci_metadata.at(j)->constant_encoding();
689 f->do_metadata(o);
690 }
691 }
692
693 // ------------------------------------------------------------------
694 // ciObjectFactory::print_contents_impl
695 void ciObjectFactory::print_contents_impl() {
696 int len = _ci_metadata.length();
697 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
698 for (int i = 0; i < len; i++) {
699 _ci_metadata.at(i)->print();
700 tty->cr();
701 }
702 }
703
704 // ------------------------------------------------------------------
705 // ciObjectFactory::print_contents
706 void ciObjectFactory::print_contents() {
707 print();
708 tty->cr();
709 GUARDED_VM_ENTRY(print_contents_impl();)
710 }
711
712 // ------------------------------------------------------------------
713 // ciObjectFactory::print
714 //
715 // Print debugging information about the object factory
716 void ciObjectFactory::print() {
717 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
718 _non_perm_count, _ci_metadata.length(), _unloaded_methods.length(),
719 _unloaded_instances.length(),
720 _unloaded_klasses.length());
721 }