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/ciFlatArray.hpp"
28 #include "ci/ciFlatArrayKlass.hpp"
29 #include "ci/ciInstance.hpp"
30 #include "ci/ciInstanceKlass.hpp"
31 #include "ci/ciMemberName.hpp"
32 #include "ci/ciMethod.hpp"
33 #include "ci/ciMethodData.hpp"
34 #include "ci/ciMethodHandle.hpp"
35 #include "ci/ciMethodType.hpp"
36 #include "ci/ciNullObject.hpp"
37 #include "ci/ciObjArray.hpp"
38 #include "ci/ciObjArrayKlass.hpp"
39 #include "ci/ciObject.hpp"
40 #include "ci/ciObjectFactory.hpp"
41 #include "ci/ciReplay.hpp"
42 #include "ci/ciSymbol.hpp"
43 #include "ci/ciSymbols.hpp"
44 #include "ci/ciTypeArray.hpp"
45 #include "ci/ciTypeArrayKlass.hpp"
46 #include "ci/ciUtilities.inline.hpp"
47 #include "ci/ciInlineKlass.hpp"
48 #include "classfile/javaClasses.inline.hpp"
49 #include "classfile/vmClasses.hpp"
50 #include "compiler/compiler_globals.hpp"
51 #include "gc/shared/collectedHeap.inline.hpp"
52 #include "memory/allocation.inline.hpp"
53 #include "memory/universe.hpp"
54 #include "oops/oop.inline.hpp"
55 #include "runtime/handles.inline.hpp"
56 #include "runtime/signature.hpp"
57 #include "utilities/macros.hpp"
58
59 // ciObjectFactory
60 //
61 // This class handles requests for the creation of new instances
62 // of ciObject and its subclasses. It contains a caching mechanism
63 // which ensures that for each oop, at most one ciObject is created.
64 // This invariant allows more efficient implementation of ciObject.
65 //
66 // Implementation note: the oop->ciObject mapping is represented as
67 // a table stored in an array. Even though objects are moved
68 // by the garbage collector, the compactor preserves their relative
69 // order; address comparison of oops (in perm space) is safe so long
70 // as we prohibit GC during our comparisons. We currently use binary
71 // search to find the oop in the table, and inserting a new oop
72 // into the table may be costly. If this cost ends up being
73 // problematic the underlying data structure can be switched to some
74 // sort of balanced binary tree.
75
76 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = nullptr;
77 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::number_of_symbols()];
78 int ciObjectFactory::_shared_ident_limit = 0;
79 volatile bool ciObjectFactory::_initialized = false;
80
81
82 // ------------------------------------------------------------------
83 // ciObjectFactory::ciObjectFactory
84 ciObjectFactory::ciObjectFactory(Arena* arena,
85 int expected_size)
86 : _arena(arena),
87 _ci_metadata(arena, expected_size, 0, nullptr),
88 _unloaded_methods(arena, 4, 0, nullptr),
89 _unloaded_klasses(arena, 8, 0, nullptr),
90 _unloaded_instances(arena, 4, 0, nullptr),
91 _return_addresses(arena, 8, 0, nullptr),
92 _symbols(arena, 100, 0, nullptr),
93 _next_ident(_shared_ident_limit),
94 _non_perm_count(0) {
95 for (int i = 0; i < NON_PERM_BUCKETS; i++) {
96 _non_perm_bucket[i] = nullptr;
97 }
98
99 // If the shared ci objects exist append them to this factory's objects
100 if (_shared_ci_metadata != nullptr) {
101 _ci_metadata.appendAll(_shared_ci_metadata);
102 }
103 }
104
105 // ------------------------------------------------------------------
106 // ciObjectFactory::ciObjectFactory
107 void ciObjectFactory::initialize() {
108 ASSERT_IN_VM;
109 JavaThread* thread = JavaThread::current();
110 HandleMark handle_mark(thread);
111
112 // This Arena is long lived and exists in the resource mark of the
113 // compiler thread that initializes the initial ciObjectFactory which
114 // creates the shared ciObjects that all later ciObjectFactories use.
115 Arena* arena = new (mtCompiler) Arena(mtCompiler);
116 ciEnv initial(arena);
117 ciEnv* env = ciEnv::current();
118 env->_factory->init_shared_objects();
119
120 _initialized = true;
121
122 }
123
124 void ciObjectFactory::init_shared_objects() {
125
126 _next_ident = 1; // start numbering CI objects at 1
127
128 {
129 // Create the shared symbols, but not in _shared_ci_metadata.
130 for (auto index : EnumRange<vmSymbolID>{}) {
131 Symbol* vmsym = vmSymbols::symbol_at(index);
132 assert(vmSymbols::find_sid(vmsym) == index, "1-1 mapping");
133 ciSymbol* sym = new (_arena) ciSymbol(vmsym, index);
134 init_ident_of(sym);
135 _shared_ci_symbols[vmSymbols::as_int(index)] = sym;
136 }
137 #ifdef ASSERT
138 for (auto index : EnumRange<vmSymbolID>{}) {
139 Symbol* vmsym = vmSymbols::symbol_at(index);
140 ciSymbol* sym = vm_symbol_at(index);
141 assert(sym->get_symbol() == vmsym, "oop must match");
142 }
143 assert(ciSymbols::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
144 #endif
145 }
146
147 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
148 BasicType t = (BasicType)i;
149 if (type2name(t) != nullptr && !is_reference_type(t) &&
150 t != T_NARROWOOP && t != T_NARROWKLASS) {
151 ciType::_basic_types[t] = new (_arena) ciType(t);
152 init_ident_of(ciType::_basic_types[t]);
153 }
154 }
155
156 ciEnv::_null_object_instance = new (_arena) ciNullObject();
157 init_ident_of(ciEnv::_null_object_instance);
158
159 #define VM_CLASS_DEFN(name, ignore_s) \
160 if (vmClasses::name##_is_loaded()) \
161 ciEnv::_##name = get_metadata(vmClasses::name())->as_instance_klass();
162
163 VM_CLASSES_DO(VM_CLASS_DEFN)
164 #undef VM_CLASS_DEFN
165
166 for (int len = -1; len != _ci_metadata.length(); ) {
167 len = _ci_metadata.length();
168 for (int i2 = 0; i2 < len; i2++) {
169 ciMetadata* obj = _ci_metadata.at(i2);
170 assert (obj->is_metadata(), "what else would it be?");
171 if (obj->is_loaded() && obj->is_instance_klass()) {
172 obj->as_instance_klass()->compute_nonstatic_fields();
173 obj->as_instance_klass()->transitive_interfaces();
174 }
175 }
176 }
177
178 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol());
179 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents
180 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, nullptr, nullptr);
181 init_ident_of(ciEnv::_unloaded_ciinstance_klass);
182 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
183 init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
184 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
185
186 get_metadata(Universe::boolArrayKlassObj());
187 get_metadata(Universe::charArrayKlassObj());
188 get_metadata(Universe::floatArrayKlassObj());
189 get_metadata(Universe::doubleArrayKlassObj());
190 get_metadata(Universe::byteArrayKlassObj());
191 get_metadata(Universe::shortArrayKlassObj());
192 get_metadata(Universe::intArrayKlassObj());
193 get_metadata(Universe::longArrayKlassObj());
194
195 assert(_non_perm_count == 0, "no shared non-perm objects");
196
197 // The shared_ident_limit is the first ident number that will
198 // be used for non-shared objects. That is, numbers less than
199 // this limit are permanently assigned to shared CI objects,
200 // while the higher numbers are recycled afresh by each new ciEnv.
201
202 _shared_ident_limit = _next_ident;
203 _shared_ci_metadata = &_ci_metadata;
204 }
205
206
207 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) {
208 vmSymbolID sid = vmSymbols::find_sid(key);
209 if (sid != vmSymbolID::NO_SID) {
210 // do not pollute the main cache with it
211 return vm_symbol_at(sid);
212 }
213
214 assert(vmSymbols::find_sid(key) == vmSymbolID::NO_SID, "");
215 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbolID::NO_SID);
216 _symbols.push(s);
217 return s;
218 }
219
220 // Decrement the refcount when done on symbols referenced by this compilation.
221 void ciObjectFactory::remove_symbols() {
222 for (int i = 0; i < _symbols.length(); i++) {
223 ciSymbol* s = _symbols.at(i);
224 s->get_symbol()->decrement_refcount();
225 }
226 // Since _symbols is resource allocated we're not allowed to delete it
227 // but it'll go away just the same.
228 }
229
230 // ------------------------------------------------------------------
231 // ciObjectFactory::get
232 //
233 // Get the ciObject corresponding to some oop. If the ciObject has
234 // already been created, it is returned. Otherwise, a new ciObject
235 // is created.
236 ciObject* ciObjectFactory::get(oop key) {
237 ASSERT_IN_VM;
238
239 assert(Universe::heap()->is_in(key), "must be");
240
241 NonPermObject* &bucket = find_non_perm(key);
242 if (bucket != nullptr) {
243 return bucket->object();
244 }
245
246 // The ciObject does not yet exist. Create it and insert it
247 // into the cache.
248 Handle keyHandle(Thread::current(), key);
249 ciObject* new_object = create_new_object(keyHandle());
250 assert(keyHandle() == new_object->get_oop(), "must be properly recorded");
251 init_ident_of(new_object);
252 assert(Universe::heap()->is_in(new_object->get_oop()), "must be");
253
254 // Not a perm-space object.
255 insert_non_perm(bucket, keyHandle(), new_object);
256 return new_object;
257 }
258
259 int ciObjectFactory::metadata_compare(Metadata* const& key, ciMetadata* const& elt) {
260 Metadata* value = elt->constant_encoding();
261 if (key < value) return -1;
262 else if (key > value) return 1;
263 else return 0;
264 }
265
266 // ------------------------------------------------------------------
267 // ciObjectFactory::cached_metadata
268 //
269 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
270 // already been created, it is returned. Otherwise, null is returned.
271 ciMetadata* ciObjectFactory::cached_metadata(Metadata* key) {
272 ASSERT_IN_VM;
273
274 bool found = false;
275 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
276
277 if (!found) {
278 return nullptr;
279 }
280 return _ci_metadata.at(index)->as_metadata();
281 }
282
283
284 // ------------------------------------------------------------------
285 // ciObjectFactory::get_metadata
286 //
287 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
288 // already been created, it is returned. Otherwise, a new ciMetadata
289 // is created.
290 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
291 ASSERT_IN_VM;
292
293 if (ReplayCompiles && key->is_klass()) {
294 Klass* k = (Klass*)key;
295 if (k->is_instance_klass() && ciReplay::is_klass_unresolved((InstanceKlass*)k)) {
296 // Klass was unresolved at replay dump time. Simulate this case.
297 return ciEnv::_unloaded_ciinstance_klass;
298 }
299 }
300
301 #ifdef ASSERT
302 if (CIObjectFactoryVerify) {
303 Metadata* last = nullptr;
304 for (int j = 0; j < _ci_metadata.length(); j++) {
305 Metadata* o = _ci_metadata.at(j)->constant_encoding();
306 assert(last < o, "out of order");
307 last = o;
308 }
309 }
310 #endif // ASSERT
311 int len = _ci_metadata.length();
312 bool found = false;
313 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
314 #ifdef ASSERT
315 if (CIObjectFactoryVerify) {
316 for (int i = 0; i < _ci_metadata.length(); i++) {
317 if (_ci_metadata.at(i)->constant_encoding() == key) {
318 assert(index == i, " bad lookup");
319 }
320 }
321 }
322 #endif
323
324 if (!found) {
325 // The ciMetadata does not yet exist. Create it and insert it
326 // into the cache.
327 ciMetadata* new_object = create_new_metadata(key);
328 init_ident_of(new_object);
329 assert(new_object->is_metadata(), "must be");
330
331 if (len != _ci_metadata.length()) {
332 // creating the new object has recursively entered new objects
333 // into the table. We need to recompute our index.
334 index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
335 }
336 assert(!found, "no double insert");
337 _ci_metadata.insert_before(index, new_object);
338 return new_object;
339 }
340 return _ci_metadata.at(index)->as_metadata();
341 }
342
343 // ------------------------------------------------------------------
344 // ciObjectFactory::create_new_object
345 //
346 // Create a new ciObject from an oop.
347 //
348 // Implementation note: this functionality could be virtual behavior
349 // of the oop itself. For now, we explicitly marshal the object.
350 ciObject* ciObjectFactory::create_new_object(oop o) {
351 EXCEPTION_CONTEXT;
352
353 if (o->is_instance()) {
354 instanceHandle h_i(THREAD, (instanceOop)o);
355 if (java_lang_invoke_CallSite::is_instance(o))
356 return new (arena()) ciCallSite(h_i);
357 else if (java_lang_invoke_MemberName::is_instance(o))
358 return new (arena()) ciMemberName(h_i);
359 else if (java_lang_invoke_MethodHandle::is_instance(o))
360 return new (arena()) ciMethodHandle(h_i);
361 else if (java_lang_invoke_MethodType::is_instance(o))
362 return new (arena()) ciMethodType(h_i);
363 else
364 return new (arena()) ciInstance(h_i);
365 } else if (o->is_objArray()) {
366 objArrayHandle h_oa(THREAD, (objArrayOop)o);
367 return new (arena()) ciObjArray(h_oa);
368 } else if (o->is_typeArray()) {
369 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
370 return new (arena()) ciTypeArray(h_ta);
371 } else if (o->is_flatArray()) {
372 flatArrayHandle h_ta(THREAD, (flatArrayOop)o);
373 return new (arena()) ciFlatArray(h_ta);
374 }
375
376 // The oop is of some type not supported by the compiler interface.
377 ShouldNotReachHere();
378 return nullptr;
379 }
380
381 // ------------------------------------------------------------------
382 // ciObjectFactory::create_new_metadata
383 //
384 // Create a new ciMetadata from a Metadata*.
385 //
386 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
387 // is used, which points to it's holder.
388 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
389 EXCEPTION_CONTEXT;
390
391 if (o->is_klass()) {
392 Klass* k = (Klass*)o;
393 if (k->is_inline_klass()) {
394 return new (arena()) ciInlineKlass(k);
395 } else if (k->is_instance_klass()) {
396 assert(!ReplayCompiles || ciReplay::no_replay_state() || !ciReplay::is_klass_unresolved((InstanceKlass*)k), "must be whitelisted for replay compilation");
397 return new (arena()) ciInstanceKlass(k);
398 } else if (k->is_flatArray_klass()) {
399 return new (arena()) ciFlatArrayKlass(k);
400 } else if (k->is_objArray_klass()) {
401 return new (arena()) ciObjArrayKlass(k);
402 } else if (k->is_typeArray_klass()) {
403 return new (arena()) ciTypeArrayKlass(k);
404 }
405 } else if (o->is_method()) {
406 methodHandle h_m(THREAD, (Method*)o);
407 ciEnv *env = CURRENT_THREAD_ENV;
408 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
409 return new (arena()) ciMethod(h_m, holder);
410 } else if (o->is_methodData()) {
411 // Hold methodHandle alive - might not be necessary ???
412 methodHandle h_m(THREAD, ((MethodData*)o)->method());
413 return new (arena()) ciMethodData((MethodData*)o);
414 }
415
416 // The Metadata* is of some type not supported by the compiler interface.
417 ShouldNotReachHere();
418 return nullptr;
419 }
420
421 //------------------------------------------------------------------
422 // ciObjectFactory::get_unloaded_method
423 //
424 // Get the ciMethod representing an unloaded/unfound method.
425 //
426 // Implementation note: unloaded methods are currently stored in
427 // an unordered array, requiring a linear-time lookup for each
428 // unloaded method. This may need to change.
429 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
430 ciSymbol* name,
431 ciSymbol* signature,
432 ciInstanceKlass* accessor) {
433 assert(accessor != nullptr, "need origin of access");
434 ciSignature* that = nullptr;
435 for (int i = 0; i < _unloaded_methods.length(); i++) {
436 ciMethod* entry = _unloaded_methods.at(i);
437 if (entry->holder()->equals(holder) &&
438 entry->name()->equals(name) &&
439 entry->signature()->as_symbol()->equals(signature)) {
440 // Short-circuit slow resolve.
441 if (entry->signature()->accessing_klass() == accessor) {
442 // We've found a match.
443 return entry;
444 } else {
445 // Lazily create ciSignature
446 if (that == nullptr) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
447 if (entry->signature()->equals(that)) {
448 // We've found a match.
449 return entry;
450 }
451 }
452 }
453 }
454
455 // This is a new unloaded method. Create it and stick it in
456 // the cache.
457 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
458
459 init_ident_of(new_method);
460 _unloaded_methods.append(new_method);
461
462 return new_method;
463 }
464
465 //------------------------------------------------------------------
466 // ciObjectFactory::get_unloaded_klass
467 //
468 // Get a ciKlass representing an unloaded klass.
469 //
470 // Implementation note: unloaded klasses are currently stored in
471 // an unordered array, requiring a linear-time lookup for each
472 // unloaded klass. This may need to change.
473 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
474 ciSymbol* name,
475 bool create_if_not_found) {
476 EXCEPTION_CONTEXT;
477 oop loader = nullptr;
478 oop domain = nullptr;
479 if (accessing_klass != nullptr) {
480 loader = accessing_klass->loader();
481 domain = accessing_klass->protection_domain();
482 }
483 for (int i = 0; i < _unloaded_klasses.length(); i++) {
484 ciKlass* entry = _unloaded_klasses.at(i);
485 if (entry->name()->equals(name) &&
486 entry->loader() == loader &&
487 entry->protection_domain() == domain) {
488 // We've found a match.
489 return entry;
490 }
491 }
492
493 if (!create_if_not_found)
494 return nullptr;
495
496 // This is a new unloaded klass. Create it and stick it in
497 // the cache.
498 ciKlass* new_klass = nullptr;
499
500 // Two cases: this is an unloaded ObjArrayKlass or an
501 // unloaded InstanceKlass. Deal with both.
502 if (name->char_at(0) == JVM_SIGNATURE_ARRAY) {
503 // Decompose the name.'
504 SignatureStream ss(name->get_symbol(), false);
505 int dimension = ss.skip_array_prefix(); // skip all '['s
506 BasicType element_type = ss.type();
507 assert(element_type != T_ARRAY, "unsuccessful decomposition");
508 ciKlass* element_klass = nullptr;
509 if (element_type == T_OBJECT) {
510 ciEnv *env = CURRENT_THREAD_ENV;
511 ciSymbol* ci_name = env->get_symbol(ss.as_symbol());
512 element_klass =
513 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
514 } else {
515 assert(dimension > 1, "one dimensional type arrays are always loaded.");
516
517 // The type array itself takes care of one of the dimensions.
518 dimension--;
519
520 // The element klass is a TypeArrayKlass.
521 element_klass = ciTypeArrayKlass::make(element_type);
522 }
523 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
524 } else {
525 jobject loader_handle = nullptr;
526 jobject domain_handle = nullptr;
527 if (accessing_klass != nullptr) {
528 loader_handle = accessing_klass->loader_handle();
529 domain_handle = accessing_klass->protection_domain_handle();
530 }
531 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle);
532 }
533 init_ident_of(new_klass);
534 _unloaded_klasses.append(new_klass);
535
536 return new_klass;
537 }
538
539
540 //------------------------------------------------------------------
541 // ciObjectFactory::get_unloaded_instance
542 //
543 // Get a ciInstance representing an as-yet undetermined instance of a given class.
544 //
545 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
546 for (int i = 0; i < _unloaded_instances.length(); i++) {
547 ciInstance* entry = _unloaded_instances.at(i);
548 if (entry->klass()->equals(instance_klass)) {
549 // We've found a match.
550 return entry;
551 }
552 }
553
554 // This is a new unloaded instance. Create it and stick it in
555 // the cache.
556 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
557
558 init_ident_of(new_instance);
559 _unloaded_instances.append(new_instance);
560
561 // make sure it looks the way we want:
562 assert(!new_instance->is_loaded(), "");
563 assert(new_instance->klass() == instance_klass, "");
564
565 return new_instance;
566 }
567
568
569 //------------------------------------------------------------------
570 // ciObjectFactory::get_unloaded_klass_mirror
571 //
572 // Get a ciInstance representing an unresolved klass mirror.
573 //
574 // Currently, this ignores the parameters and returns a unique unloaded instance.
575 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
576 assert(ciEnv::_Class_klass != nullptr, "");
577 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
578 }
579
580 //------------------------------------------------------------------
581 // ciObjectFactory::get_unloaded_method_handle_constant
582 //
583 // Get a ciInstance representing an unresolved method handle constant.
584 //
585 // Currently, this ignores the parameters and returns a unique unloaded instance.
586 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
587 ciSymbol* name,
588 ciSymbol* signature,
589 int ref_kind) {
590 assert(ciEnv::_MethodHandle_klass != nullptr, "");
591 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
592 }
593
594 //------------------------------------------------------------------
595 // ciObjectFactory::get_unloaded_method_type_constant
596 //
597 // Get a ciInstance representing an unresolved method type constant.
598 //
599 // Currently, this ignores the parameters and returns a unique unloaded instance.
600 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
601 assert(ciEnv::_MethodType_klass != nullptr, "");
602 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
603 }
604
605 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
606 assert(ciEnv::_Object_klass != nullptr, "");
607 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
608 }
609
610 //------------------------------------------------------------------
611 // ciObjectFactory::get_empty_methodData
612 //
613 // Get the ciMethodData representing the methodData for a method with
614 // none.
615 ciMethodData* ciObjectFactory::get_empty_methodData() {
616 ciMethodData* new_methodData = new (arena()) ciMethodData();
617 init_ident_of(new_methodData);
618 return new_methodData;
619 }
620
621 //------------------------------------------------------------------
622 // ciObjectFactory::get_return_address
623 //
624 // Get a ciReturnAddress for a specified bci.
625 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
626 for (int i = 0; i < _return_addresses.length(); i++) {
627 ciReturnAddress* entry = _return_addresses.at(i);
628 if (entry->bci() == bci) {
629 // We've found a match.
630 return entry;
631 }
632 }
633
634 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
635 init_ident_of(new_ret_addr);
636 _return_addresses.append(new_ret_addr);
637 return new_ret_addr;
638 }
639
640 ciWrapper* ciObjectFactory::make_null_free_wrapper(ciType* type) {
641 ciWrapper* wrapper = new (arena()) ciWrapper(type);
642 init_ident_of(wrapper);
643 return wrapper;
644 }
645
646 // ------------------------------------------------------------------
647 // ciObjectFactory::init_ident_of
648 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
649 obj->set_ident(_next_ident++);
650 }
651
652 static ciObjectFactory::NonPermObject* emptyBucket = nullptr;
653
654 // ------------------------------------------------------------------
655 // ciObjectFactory::find_non_perm
656 //
657 // Use a small hash table, hashed on the klass of the key.
658 // If there is no entry in the cache corresponding to this oop, return
659 // the null tail of the bucket into which the oop should be inserted.
660 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
661 assert(Universe::heap()->is_in(key), "must be");
662 ciMetadata* klass = get_metadata(key->klass());
663 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
664 for (NonPermObject* p; (p = (*bp)) != nullptr; bp = &p->next()) {
665 if (is_equal(p, key)) break;
666 }
667 return (*bp);
668 }
669
670
671
672 // ------------------------------------------------------------------
673 // Code for for NonPermObject
674 //
675 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
676 assert(ciObjectFactory::is_initialized(), "");
677 _object = object;
678 _next = bucket;
679 bucket = this;
680 }
681
682
683
684 // ------------------------------------------------------------------
685 // ciObjectFactory::insert_non_perm
686 //
687 // Insert a ciObject into the non-perm table.
688 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
689 assert(Universe::heap()->is_in_or_null(key), "must be");
690 assert(&where != &emptyBucket, "must not try to fill empty bucket");
691 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
692 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
693 assert(find_non_perm(key) == p, "must find the same spot");
694 ++_non_perm_count;
695 }
696
697 // ------------------------------------------------------------------
698 // ciObjectFactory::vm_symbol_at
699 // Get the ciSymbol corresponding to some index in vmSymbols.
700 ciSymbol* ciObjectFactory::vm_symbol_at(vmSymbolID sid) {
701 int index = vmSymbols::as_int(sid);
702 return _shared_ci_symbols[index];
703 }
704
705 // ------------------------------------------------------------------
706 // ciObjectFactory::metadata_do
707 void ciObjectFactory::metadata_do(MetadataClosure* f) {
708 for (int j = 0; j < _ci_metadata.length(); j++) {
709 Metadata* o = _ci_metadata.at(j)->constant_encoding();
710 f->do_metadata(o);
711 }
712 }
713
714 // ------------------------------------------------------------------
715 // ciObjectFactory::print_contents_impl
716 void ciObjectFactory::print_contents_impl() {
717 int len = _ci_metadata.length();
718 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
719 for (int i = 0; i < len; i++) {
720 _ci_metadata.at(i)->print();
721 tty->cr();
722 }
723 }
724
725 // ------------------------------------------------------------------
726 // ciObjectFactory::print_contents
727 void ciObjectFactory::print_contents() {
728 print();
729 tty->cr();
730 GUARDED_VM_ENTRY(print_contents_impl();)
731 }
732
733 // ------------------------------------------------------------------
734 // ciObjectFactory::print
735 //
736 // Print debugging information about the object factory
737 void ciObjectFactory::print() {
738 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
739 _non_perm_count, _ci_metadata.length(), _unloaded_methods.length(),
740 _unloaded_instances.length(),
741 _unloaded_klasses.length());
742 }