1 /*
2 * Copyright (c) 1999, 2023, 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/ciCallSite.hpp"
27 #include "ci/ciInstance.hpp"
28 #include "ci/ciInstanceKlass.hpp"
29 #include "ci/ciMemberName.hpp"
30 #include "ci/ciMethod.hpp"
31 #include "ci/ciMethodData.hpp"
32 #include "ci/ciMethodHandle.hpp"
33 #include "ci/ciMethodType.hpp"
34 #include "ci/ciNullObject.hpp"
35 #include "ci/ciObjArray.hpp"
36 #include "ci/ciObjArrayKlass.hpp"
37 #include "ci/ciObject.hpp"
38 #include "ci/ciObjectFactory.hpp"
39 #include "ci/ciReplay.hpp"
40 #include "ci/ciSymbol.hpp"
41 #include "ci/ciSymbols.hpp"
42 #include "ci/ciTypeArray.hpp"
43 #include "ci/ciTypeArrayKlass.hpp"
44 #include "ci/ciUtilities.inline.hpp"
45 #include "classfile/javaClasses.inline.hpp"
46 #include "classfile/vmClasses.hpp"
47 #include "compiler/compiler_globals.hpp"
48 #include "gc/shared/collectedHeap.inline.hpp"
49 #include "memory/allocation.inline.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "runtime/signature.hpp"
54 #include "utilities/macros.hpp"
55
56 // ciObjectFactory
57 //
58 // This class handles requests for the creation of new instances
59 // of ciObject and its subclasses. It contains a caching mechanism
60 // which ensures that for each oop, at most one ciObject is created.
61 // This invariant allows more efficient implementation of ciObject.
62 //
63 // Implementation note: the oop->ciObject mapping is represented as
64 // a table stored in an array. Even though objects are moved
65 // by the garbage collector, the compactor preserves their relative
66 // order; address comparison of oops (in perm space) is safe so long
67 // as we prohibit GC during our comparisons. We currently use binary
68 // search to find the oop in the table, and inserting a new oop
69 // into the table may be costly. If this cost ends up being
70 // problematic the underlying data structure can be switched to some
71 // sort of balanced binary tree.
72
73 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = nullptr;
74 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::number_of_symbols()];
75 int ciObjectFactory::_shared_ident_limit = 0;
76 volatile bool ciObjectFactory::_initialized = false;
77
78
79 // ------------------------------------------------------------------
80 // ciObjectFactory::ciObjectFactory
81 ciObjectFactory::ciObjectFactory(Arena* arena,
82 int expected_size)
83 : _arena(arena),
84 _ci_metadata(arena, expected_size, 0, nullptr),
85 _unloaded_methods(arena, 4, 0, nullptr),
86 _unloaded_klasses(arena, 8, 0, nullptr),
87 _unloaded_instances(arena, 4, 0, nullptr),
88 _return_addresses(arena, 8, 0, nullptr),
89 _symbols(arena, 100, 0, nullptr),
90 _next_ident(_shared_ident_limit),
91 _non_perm_count(0) {
92 for (int i = 0; i < NON_PERM_BUCKETS; i++) {
93 _non_perm_bucket[i] = nullptr;
94 }
95
96 // If the shared ci objects exist append them to this factory's objects
97 if (_shared_ci_metadata != nullptr) {
98 _ci_metadata.appendAll(_shared_ci_metadata);
99 }
100 }
101
102 // ------------------------------------------------------------------
103 // ciObjectFactory::ciObjectFactory
104 void ciObjectFactory::initialize() {
105 ASSERT_IN_VM;
106 JavaThread* thread = JavaThread::current();
107 HandleMark handle_mark(thread);
108
109 // This Arena is long lived and exists in the resource mark of the
110 // compiler thread that initializes the initial ciObjectFactory which
111 // creates the shared ciObjects that all later ciObjectFactories use.
112 Arena* arena = new (mtCompiler) Arena(mtCompiler);
113 ciEnv initial(arena);
114 ciEnv* env = ciEnv::current();
115 env->_factory->init_shared_objects();
116
117 _initialized = true;
118
119 }
120
121 void ciObjectFactory::init_shared_objects() {
122
123 _next_ident = 1; // start numbering CI objects at 1
124
125 {
126 // Create the shared symbols, but not in _shared_ci_metadata.
127 for (auto index : EnumRange<vmSymbolID>{}) {
128 Symbol* vmsym = vmSymbols::symbol_at(index);
129 assert(vmSymbols::find_sid(vmsym) == index, "1-1 mapping");
130 ciSymbol* sym = new (_arena) ciSymbol(vmsym, index);
131 init_ident_of(sym);
132 _shared_ci_symbols[vmSymbols::as_int(index)] = sym;
133 }
134 #ifdef ASSERT
135 for (auto index : EnumRange<vmSymbolID>{}) {
136 Symbol* vmsym = vmSymbols::symbol_at(index);
137 ciSymbol* sym = vm_symbol_at(index);
138 assert(sym->get_symbol() == vmsym, "oop must match");
139 }
140 assert(ciSymbols::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
141 #endif
142 }
143
144 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
145 BasicType t = (BasicType)i;
146 if (type2name(t) != nullptr && !is_reference_type(t) &&
147 t != T_NARROWOOP && t != T_NARROWKLASS) {
148 ciType::_basic_types[t] = new (_arena) ciType(t);
149 init_ident_of(ciType::_basic_types[t]);
150 }
151 }
152
153 ciEnv::_null_object_instance = new (_arena) ciNullObject();
154 init_ident_of(ciEnv::_null_object_instance);
155
156 #define VM_CLASS_DEFN(name, ignore_s) \
157 if (vmClasses::name##_is_loaded()) \
158 ciEnv::_##name = get_metadata(vmClasses::name())->as_instance_klass();
159
160 VM_CLASSES_DO(VM_CLASS_DEFN)
161 #undef VM_CLASS_DEFN
162
163 for (int len = -1; len != _ci_metadata.length(); ) {
164 len = _ci_metadata.length();
165 for (int i2 = 0; i2 < len; i2++) {
166 ciMetadata* obj = _ci_metadata.at(i2);
167 assert (obj->is_metadata(), "what else would it be?");
168 if (obj->is_loaded() && obj->is_instance_klass()) {
169 obj->as_instance_klass()->compute_nonstatic_fields();
170 obj->as_instance_klass()->transitive_interfaces();
171 }
172 }
173 }
174
175 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol());
176 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents
177 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, nullptr, nullptr);
178 init_ident_of(ciEnv::_unloaded_ciinstance_klass);
179 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
180 init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
181 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
182
183 get_metadata(Universe::boolArrayKlassObj());
184 get_metadata(Universe::charArrayKlassObj());
185 get_metadata(Universe::floatArrayKlassObj());
186 get_metadata(Universe::doubleArrayKlassObj());
187 get_metadata(Universe::byteArrayKlassObj());
188 get_metadata(Universe::shortArrayKlassObj());
189 get_metadata(Universe::intArrayKlassObj());
190 get_metadata(Universe::longArrayKlassObj());
191
192 assert(_non_perm_count == 0, "no shared non-perm objects");
193
194 // The shared_ident_limit is the first ident number that will
195 // be used for non-shared objects. That is, numbers less than
196 // this limit are permanently assigned to shared CI objects,
197 // while the higher numbers are recycled afresh by each new ciEnv.
198
199 _shared_ident_limit = _next_ident;
200 _shared_ci_metadata = &_ci_metadata;
201 }
202
203
204 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) {
205 vmSymbolID sid = vmSymbols::find_sid(key);
206 if (sid != vmSymbolID::NO_SID) {
207 // do not pollute the main cache with it
208 return vm_symbol_at(sid);
209 }
210
211 assert(vmSymbols::find_sid(key) == vmSymbolID::NO_SID, "");
212 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbolID::NO_SID);
213 _symbols.push(s);
214 return s;
215 }
216
217 // Decrement the refcount when done on symbols referenced by this compilation.
218 void ciObjectFactory::remove_symbols() {
219 for (int i = 0; i < _symbols.length(); i++) {
220 ciSymbol* s = _symbols.at(i);
221 s->get_symbol()->decrement_refcount();
222 }
223 // Since _symbols is resource allocated we're not allowed to delete it
224 // but it'll go away just the same.
225 }
226
227 // ------------------------------------------------------------------
228 // ciObjectFactory::get
229 //
230 // Get the ciObject corresponding to some oop. If the ciObject has
231 // already been created, it is returned. Otherwise, a new ciObject
232 // is created.
233 ciObject* ciObjectFactory::get(oop key) {
234 ASSERT_IN_VM;
235
236 assert(Universe::heap()->is_in(key), "must be");
237
238 NonPermObject* &bucket = find_non_perm(key);
239 if (bucket != nullptr) {
240 return bucket->object();
241 }
242
243 // The ciObject does not yet exist. Create it and insert it
244 // into the cache.
245 Handle keyHandle(Thread::current(), key);
246 ciObject* new_object = create_new_object(keyHandle());
247 assert(keyHandle() == new_object->get_oop(), "must be properly recorded");
248 init_ident_of(new_object);
249 assert(Universe::heap()->is_in(new_object->get_oop()), "must be");
250
251 // Not a perm-space object.
252 insert_non_perm(bucket, keyHandle(), new_object);
253 return new_object;
254 }
255
256 int ciObjectFactory::metadata_compare(Metadata* const& key, ciMetadata* const& elt) {
257 Metadata* value = elt->constant_encoding();
258 if (key < value) return -1;
259 else if (key > value) return 1;
260 else return 0;
261 }
262
263 // ------------------------------------------------------------------
264 // ciObjectFactory::cached_metadata
265 //
266 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
267 // already been created, it is returned. Otherwise, null is returned.
268 ciMetadata* ciObjectFactory::cached_metadata(Metadata* key) {
269 ASSERT_IN_VM;
270
271 bool found = false;
272 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
273
274 if (!found) {
275 return nullptr;
276 }
277 return _ci_metadata.at(index)->as_metadata();
278 }
279
280
281 // ------------------------------------------------------------------
282 // ciObjectFactory::get_metadata
283 //
284 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
285 // already been created, it is returned. Otherwise, a new ciMetadata
286 // is created.
287 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
288 ASSERT_IN_VM;
289
290 if (ReplayCompiles && key->is_klass()) {
291 Klass* k = (Klass*)key;
292 if (k->is_instance_klass() && ciReplay::is_klass_unresolved((InstanceKlass*)k)) {
293 // Klass was unresolved at replay dump time. Simulate this case.
294 return ciEnv::_unloaded_ciinstance_klass;
295 }
296 }
297
298 #ifdef ASSERT
299 if (CIObjectFactoryVerify) {
300 Metadata* last = nullptr;
301 for (int j = 0; j < _ci_metadata.length(); j++) {
302 Metadata* o = _ci_metadata.at(j)->constant_encoding();
303 assert(last < o, "out of order");
304 last = o;
305 }
306 }
307 #endif // ASSERT
308 int len = _ci_metadata.length();
309 bool found = false;
310 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
311 #ifdef ASSERT
312 if (CIObjectFactoryVerify) {
313 for (int i = 0; i < _ci_metadata.length(); i++) {
314 if (_ci_metadata.at(i)->constant_encoding() == key) {
315 assert(index == i, " bad lookup");
316 }
317 }
318 }
319 #endif
320
321 if (!found) {
322 // The ciMetadata does not yet exist. Create it and insert it
323 // into the cache.
324 ciMetadata* new_object = create_new_metadata(key);
325 init_ident_of(new_object);
326 assert(new_object->is_metadata(), "must be");
327
328 if (len != _ci_metadata.length()) {
329 // creating the new object has recursively entered new objects
330 // into the table. We need to recompute our index.
331 index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
332 }
333 assert(!found, "no double insert");
334 _ci_metadata.insert_before(index, new_object);
335 return new_object;
336 }
337 return _ci_metadata.at(index)->as_metadata();
338 }
339
340 // ------------------------------------------------------------------
341 // ciObjectFactory::create_new_object
342 //
343 // Create a new ciObject from an oop.
344 //
345 // Implementation note: this functionality could be virtual behavior
346 // of the oop itself. For now, we explicitly marshal the object.
347 ciObject* ciObjectFactory::create_new_object(oop o) {
348 EXCEPTION_CONTEXT;
349
350 if (o->is_instance()) {
351 instanceHandle h_i(THREAD, (instanceOop)o);
352 if (java_lang_invoke_CallSite::is_instance(o))
353 return new (arena()) ciCallSite(h_i);
354 else if (java_lang_invoke_MemberName::is_instance(o))
355 return new (arena()) ciMemberName(h_i);
356 else if (java_lang_invoke_MethodHandle::is_instance(o))
357 return new (arena()) ciMethodHandle(h_i);
358 else if (java_lang_invoke_MethodType::is_instance(o))
359 return new (arena()) ciMethodType(h_i);
360 else
361 return new (arena()) ciInstance(h_i);
362 } else if (o->is_objArray()) {
363 objArrayHandle h_oa(THREAD, (objArrayOop)o);
364 return new (arena()) ciObjArray(h_oa);
365 } else if (o->is_typeArray()) {
366 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
367 return new (arena()) ciTypeArray(h_ta);
368 }
369
370 // The oop is of some type not supported by the compiler interface.
371 ShouldNotReachHere();
372 return nullptr;
373 }
374
375 // ------------------------------------------------------------------
376 // ciObjectFactory::create_new_metadata
377 //
378 // Create a new ciMetadata from a Metadata*.
379 //
380 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
381 // is used, which points to it's holder.
382 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
383 EXCEPTION_CONTEXT;
384
385 if (o->is_klass()) {
386 Klass* k = (Klass*)o;
387 if (k->is_instance_klass()) {
388 assert(!ReplayCompiles || ciReplay::no_replay_state() || !ciReplay::is_klass_unresolved((InstanceKlass*)k), "must be whitelisted for replay compilation");
389 return new (arena()) ciInstanceKlass(k);
390 } else if (k->is_objArray_klass()) {
391 return new (arena()) ciObjArrayKlass(k);
392 } else if (k->is_typeArray_klass()) {
393 return new (arena()) ciTypeArrayKlass(k);
394 }
395 } else if (o->is_method()) {
396 methodHandle h_m(THREAD, (Method*)o);
397 ciEnv *env = CURRENT_THREAD_ENV;
398 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
399 return new (arena()) ciMethod(h_m, holder);
400 } else if (o->is_methodData()) {
401 // Hold methodHandle alive - might not be necessary ???
402 methodHandle h_m(THREAD, ((MethodData*)o)->method());
403 return new (arena()) ciMethodData((MethodData*)o);
404 }
405
406 // The Metadata* is of some type not supported by the compiler interface.
407 ShouldNotReachHere();
408 return nullptr;
409 }
410
411 //------------------------------------------------------------------
412 // ciObjectFactory::get_unloaded_method
413 //
414 // Get the ciMethod representing an unloaded/unfound method.
415 //
416 // Implementation note: unloaded methods are currently stored in
417 // an unordered array, requiring a linear-time lookup for each
418 // unloaded method. This may need to change.
419 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
420 ciSymbol* name,
421 ciSymbol* signature,
422 ciInstanceKlass* accessor) {
423 assert(accessor != nullptr, "need origin of access");
424 ciSignature* that = nullptr;
425 for (int i = 0; i < _unloaded_methods.length(); i++) {
426 ciMethod* entry = _unloaded_methods.at(i);
427 if (entry->holder()->equals(holder) &&
428 entry->name()->equals(name) &&
429 entry->signature()->as_symbol()->equals(signature)) {
430 // Short-circuit slow resolve.
431 if (entry->signature()->accessing_klass() == accessor) {
432 // We've found a match.
433 return entry;
434 } else {
435 // Lazily create ciSignature
436 if (that == nullptr) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
437 if (entry->signature()->equals(that)) {
438 // We've found a match.
439 return entry;
440 }
441 }
442 }
443 }
444
445 // This is a new unloaded method. Create it and stick it in
446 // the cache.
447 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
448
449 init_ident_of(new_method);
450 _unloaded_methods.append(new_method);
451
452 return new_method;
453 }
454
455 //------------------------------------------------------------------
456 // ciObjectFactory::get_unloaded_klass
457 //
458 // Get a ciKlass representing an unloaded klass.
459 //
460 // Implementation note: unloaded klasses are currently stored in
461 // an unordered array, requiring a linear-time lookup for each
462 // unloaded klass. This may need to change.
463 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
464 ciSymbol* name,
465 bool create_if_not_found) {
466 EXCEPTION_CONTEXT;
467 oop loader = nullptr;
468 oop domain = nullptr;
469 if (accessing_klass != nullptr) {
470 loader = accessing_klass->loader();
471 domain = accessing_klass->protection_domain();
472 }
473 for (int i = 0; i < _unloaded_klasses.length(); i++) {
474 ciKlass* entry = _unloaded_klasses.at(i);
475 if (entry->name()->equals(name) &&
476 entry->loader() == loader &&
477 entry->protection_domain() == domain) {
478 // We've found a match.
479 return entry;
480 }
481 }
482
483 if (!create_if_not_found)
484 return nullptr;
485
486 // This is a new unloaded klass. Create it and stick it in
487 // the cache.
488 ciKlass* new_klass = nullptr;
489
490 // Two cases: this is an unloaded ObjArrayKlass or an
491 // unloaded InstanceKlass. Deal with both.
492 if (name->char_at(0) == JVM_SIGNATURE_ARRAY) {
493 // Decompose the name.'
494 SignatureStream ss(name->get_symbol(), false);
495 int dimension = ss.skip_array_prefix(); // skip all '['s
496 BasicType element_type = ss.type();
497 assert(element_type != T_ARRAY, "unsuccessful decomposition");
498 ciKlass* element_klass = nullptr;
499 if (element_type == T_OBJECT) {
500 ciEnv *env = CURRENT_THREAD_ENV;
501 ciSymbol* ci_name = env->get_symbol(ss.as_symbol());
502 element_klass =
503 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
504 } else {
505 assert(dimension > 1, "one dimensional type arrays are always loaded.");
506
507 // The type array itself takes care of one of the dimensions.
508 dimension--;
509
510 // The element klass is a TypeArrayKlass.
511 element_klass = ciTypeArrayKlass::make(element_type);
512 }
513 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
514 } else {
515 jobject loader_handle = nullptr;
516 jobject domain_handle = nullptr;
517 if (accessing_klass != nullptr) {
518 loader_handle = accessing_klass->loader_handle();
519 domain_handle = accessing_klass->protection_domain_handle();
520 }
521 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle);
522 }
523 init_ident_of(new_klass);
524 _unloaded_klasses.append(new_klass);
525
526 return new_klass;
527 }
528
529
530 //------------------------------------------------------------------
531 // ciObjectFactory::get_unloaded_instance
532 //
533 // Get a ciInstance representing an as-yet undetermined instance of a given class.
534 //
535 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
536 for (int i = 0; i < _unloaded_instances.length(); i++) {
537 ciInstance* entry = _unloaded_instances.at(i);
538 if (entry->klass()->equals(instance_klass)) {
539 // We've found a match.
540 return entry;
541 }
542 }
543
544 // This is a new unloaded instance. Create it and stick it in
545 // the cache.
546 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
547
548 init_ident_of(new_instance);
549 _unloaded_instances.append(new_instance);
550
551 // make sure it looks the way we want:
552 assert(!new_instance->is_loaded(), "");
553 assert(new_instance->klass() == instance_klass, "");
554
555 return new_instance;
556 }
557
558
559 //------------------------------------------------------------------
560 // ciObjectFactory::get_unloaded_klass_mirror
561 //
562 // Get a ciInstance representing an unresolved klass mirror.
563 //
564 // Currently, this ignores the parameters and returns a unique unloaded instance.
565 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
566 assert(ciEnv::_Class_klass != nullptr, "");
567 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
568 }
569
570 //------------------------------------------------------------------
571 // ciObjectFactory::get_unloaded_method_handle_constant
572 //
573 // Get a ciInstance representing an unresolved method handle constant.
574 //
575 // Currently, this ignores the parameters and returns a unique unloaded instance.
576 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
577 ciSymbol* name,
578 ciSymbol* signature,
579 int ref_kind) {
580 assert(ciEnv::_MethodHandle_klass != nullptr, "");
581 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
582 }
583
584 //------------------------------------------------------------------
585 // ciObjectFactory::get_unloaded_method_type_constant
586 //
587 // Get a ciInstance representing an unresolved method type constant.
588 //
589 // Currently, this ignores the parameters and returns a unique unloaded instance.
590 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
591 assert(ciEnv::_MethodType_klass != nullptr, "");
592 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
593 }
594
595 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
596 assert(ciEnv::_Object_klass != nullptr, "");
597 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
598 }
599
600 //------------------------------------------------------------------
601 // ciObjectFactory::get_empty_methodData
602 //
603 // Get the ciMethodData representing the methodData for a method with
604 // none.
605 ciMethodData* ciObjectFactory::get_empty_methodData() {
606 ciMethodData* new_methodData = new (arena()) ciMethodData();
607 init_ident_of(new_methodData);
608 return new_methodData;
609 }
610
611 //------------------------------------------------------------------
612 // ciObjectFactory::get_return_address
613 //
614 // Get a ciReturnAddress for a specified bci.
615 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
616 for (int i = 0; i < _return_addresses.length(); i++) {
617 ciReturnAddress* entry = _return_addresses.at(i);
618 if (entry->bci() == bci) {
619 // We've found a match.
620 return entry;
621 }
622 }
623
624 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
625 init_ident_of(new_ret_addr);
626 _return_addresses.append(new_ret_addr);
627 return new_ret_addr;
628 }
629
630 // ------------------------------------------------------------------
631 // ciObjectFactory::init_ident_of
632 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
633 obj->set_ident(_next_ident++);
634 }
635
636 static ciObjectFactory::NonPermObject* emptyBucket = nullptr;
637
638 // ------------------------------------------------------------------
639 // ciObjectFactory::find_non_perm
640 //
641 // Use a small hash table, hashed on the klass of the key.
642 // If there is no entry in the cache corresponding to this oop, return
643 // the null tail of the bucket into which the oop should be inserted.
644 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
645 assert(Universe::heap()->is_in(key), "must be");
646 ciMetadata* klass = get_metadata(key->klass());
647 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
648 for (NonPermObject* p; (p = (*bp)) != nullptr; bp = &p->next()) {
649 if (is_equal(p, key)) break;
650 }
651 return (*bp);
652 }
653
654
655
656 // ------------------------------------------------------------------
657 // Code for for NonPermObject
658 //
659 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
660 assert(ciObjectFactory::is_initialized(), "");
661 _object = object;
662 _next = bucket;
663 bucket = this;
664 }
665
666
667
668 // ------------------------------------------------------------------
669 // ciObjectFactory::insert_non_perm
670 //
671 // Insert a ciObject into the non-perm table.
672 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
673 assert(Universe::heap()->is_in_or_null(key), "must be");
674 assert(&where != &emptyBucket, "must not try to fill empty bucket");
675 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
676 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
677 assert(find_non_perm(key) == p, "must find the same spot");
678 ++_non_perm_count;
679 }
680
681 // ------------------------------------------------------------------
682 // ciObjectFactory::vm_symbol_at
683 // Get the ciSymbol corresponding to some index in vmSymbols.
684 ciSymbol* ciObjectFactory::vm_symbol_at(vmSymbolID sid) {
685 int index = vmSymbols::as_int(sid);
686 return _shared_ci_symbols[index];
687 }
688
689 // ------------------------------------------------------------------
690 // ciObjectFactory::metadata_do
691 void ciObjectFactory::metadata_do(MetadataClosure* f) {
692 for (int j = 0; j < _ci_metadata.length(); j++) {
693 Metadata* o = _ci_metadata.at(j)->constant_encoding();
694 f->do_metadata(o);
695 }
696 }
697
698 // ------------------------------------------------------------------
699 // ciObjectFactory::print_contents_impl
700 void ciObjectFactory::print_contents_impl() {
701 int len = _ci_metadata.length();
702 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
703 for (int i = 0; i < len; i++) {
704 _ci_metadata.at(i)->print();
705 tty->cr();
706 }
707 }
708
709 // ------------------------------------------------------------------
710 // ciObjectFactory::print_contents
711 void ciObjectFactory::print_contents() {
712 print();
713 tty->cr();
714 GUARDED_VM_ENTRY(print_contents_impl();)
715 }
716
717 // ------------------------------------------------------------------
718 // ciObjectFactory::print
719 //
720 // Print debugging information about the object factory
721 void ciObjectFactory::print() {
722 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
723 _non_perm_count, _ci_metadata.length(), _unloaded_methods.length(),
724 _unloaded_instances.length(),
725 _unloaded_klasses.length());
726 }