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/compileTask.hpp"
48 #include "compiler/compiler_globals.hpp"
49 #include "gc/shared/collectedHeap.inline.hpp"
50 #include "memory/allocation.inline.hpp"
51 #include "memory/universe.hpp"
52 #include "oops/oop.inline.hpp"
53 #include "oops/trainingData.hpp"
54 #include "runtime/handles.inline.hpp"
55 #include "runtime/signature.hpp"
56 #include "utilities/macros.hpp"
57
58 // ciObjectFactory
59 //
60 // This class handles requests for the creation of new instances
61 // of ciObject and its subclasses. It contains a caching mechanism
62 // which ensures that for each oop, at most one ciObject is created.
63 // This invariant allows more efficient implementation of ciObject.
64 //
65 // Implementation note: the oop->ciObject mapping is represented as
66 // a table stored in an array. Even though objects are moved
67 // by the garbage collector, the compactor preserves their relative
68 // order; address comparison of oops (in perm space) is safe so long
69 // as we prohibit GC during our comparisons. We currently use binary
70 // search to find the oop in the table, and inserting a new oop
71 // into the table may be costly. If this cost ends up being
72 // problematic the underlying data structure can be switched to some
73 // sort of balanced binary tree.
74
75 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = nullptr;
76 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::number_of_symbols()];
77 int ciObjectFactory::_shared_ident_limit = 0;
78 volatile bool ciObjectFactory::_initialized = false;
79
80
81 // ------------------------------------------------------------------
82 // ciObjectFactory::ciObjectFactory
83 ciObjectFactory::ciObjectFactory(Arena* arena,
84 int expected_size)
85 : _arena(arena),
86 _ci_metadata(arena, expected_size, 0, nullptr),
87 _unloaded_methods(arena, 4, 0, nullptr),
88 _unloaded_klasses(arena, 8, 0, nullptr),
89 _unloaded_instances(arena, 4, 0, nullptr),
90 _return_addresses(arena, 8, 0, nullptr),
91 _symbols(arena, 100, 0, nullptr),
92 _next_ident(_shared_ident_limit),
93 _non_perm_count(0) {
94 for (int i = 0; i < NON_PERM_BUCKETS; i++) {
95 _non_perm_bucket[i] = nullptr;
96 }
97
98 // If the shared ci objects exist append them to this factory's objects
99 if (_shared_ci_metadata != nullptr) {
100 _ci_metadata.appendAll(_shared_ci_metadata);
101 }
102 }
103
104 // ------------------------------------------------------------------
105 // ciObjectFactory::ciObjectFactory
106 void ciObjectFactory::initialize() {
107 ASSERT_IN_VM;
108 JavaThread* thread = JavaThread::current();
109 HandleMark handle_mark(thread);
110
111 // This Arena is long lived and exists in the resource mark of the
112 // compiler thread that initializes the initial ciObjectFactory which
113 // creates the shared ciObjects that all later ciObjectFactories use.
114 Arena* arena = new (mtCompiler) Arena(mtCompiler);
115 ciEnv initial(arena);
116 ciEnv* env = ciEnv::current();
117 env->_factory->init_shared_objects();
118
119 _initialized = true;
120
121 }
122
123 void ciObjectFactory::init_shared_objects() {
124
125 _next_ident = 1; // start numbering CI objects at 1
126
127 {
128 // Create the shared symbols, but not in _shared_ci_metadata.
129 for (auto index : EnumRange<vmSymbolID>{}) {
130 Symbol* vmsym = vmSymbols::symbol_at(index);
131 assert(vmSymbols::find_sid(vmsym) == index, "1-1 mapping");
132 ciSymbol* sym = new (_arena) ciSymbol(vmsym, index);
133 init_ident_of(sym);
134 _shared_ci_symbols[vmSymbols::as_int(index)] = sym;
135 }
136 #ifdef ASSERT
137 for (auto index : EnumRange<vmSymbolID>{}) {
138 Symbol* vmsym = vmSymbols::symbol_at(index);
139 ciSymbol* sym = vm_symbol_at(index);
140 assert(sym->get_symbol() == vmsym, "oop must match");
141 }
142 assert(ciSymbols::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
143 #endif
144 }
145
146 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
147 BasicType t = (BasicType)i;
148 if (type2name(t) != nullptr && !is_reference_type(t) &&
149 t != T_NARROWOOP && t != T_NARROWKLASS) {
150 ciType::_basic_types[t] = new (_arena) ciType(t);
151 init_ident_of(ciType::_basic_types[t]);
152 }
153 }
154
155 ciEnv::_null_object_instance = new (_arena) ciNullObject();
156 init_ident_of(ciEnv::_null_object_instance);
157
158 #define VM_CLASS_DEFN(name, ignore_s) \
159 if (vmClasses::name##_is_loaded()) \
160 ciEnv::_##name = get_metadata(vmClasses::name())->as_instance_klass();
161
162 VM_CLASSES_DO(VM_CLASS_DEFN)
163 #undef VM_CLASS_DEFN
164
165 for (int len = -1; len != _ci_metadata.length(); ) {
166 len = _ci_metadata.length();
167 for (int i2 = 0; i2 < len; i2++) {
168 ciMetadata* obj = _ci_metadata.at(i2);
169 assert (obj->is_metadata(), "what else would it be?");
170 if (obj->is_loaded() && obj->is_instance_klass()) {
171 obj->as_instance_klass()->compute_nonstatic_fields();
172 obj->as_instance_klass()->transitive_interfaces();
173 }
174 }
175 }
176
177 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol());
178 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents
179 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, nullptr, nullptr);
180 init_ident_of(ciEnv::_unloaded_ciinstance_klass);
181 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
182 init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
183 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
184
185 get_metadata(Universe::boolArrayKlass());
186 get_metadata(Universe::charArrayKlass());
187 get_metadata(Universe::floatArrayKlass());
188 get_metadata(Universe::doubleArrayKlass());
189 get_metadata(Universe::byteArrayKlass());
190 get_metadata(Universe::shortArrayKlass());
191 get_metadata(Universe::intArrayKlass());
192 get_metadata(Universe::longArrayKlass());
193
194 assert(_non_perm_count == 0, "no shared non-perm objects");
195
196 // The shared_ident_limit is the first ident number that will
197 // be used for non-shared objects. That is, numbers less than
198 // this limit are permanently assigned to shared CI objects,
199 // while the higher numbers are recycled afresh by each new ciEnv.
200
201 _shared_ident_limit = _next_ident;
202 _shared_ci_metadata = &_ci_metadata;
203 }
204
205
206 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) {
207 vmSymbolID sid = vmSymbols::find_sid(key);
208 if (sid != vmSymbolID::NO_SID) {
209 // do not pollute the main cache with it
210 return vm_symbol_at(sid);
211 }
212
213 assert(vmSymbols::find_sid(key) == vmSymbolID::NO_SID, "");
214 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbolID::NO_SID);
215 _symbols.push(s);
216 return s;
217 }
218
219 // Decrement the refcount when done on symbols referenced by this compilation.
220 void ciObjectFactory::remove_symbols() {
221 for (int i = 0; i < _symbols.length(); i++) {
222 ciSymbol* s = _symbols.at(i);
223 s->get_symbol()->decrement_refcount();
224 }
225 // Since _symbols is resource allocated we're not allowed to delete it
226 // but it'll go away just the same.
227 }
228
229 // ------------------------------------------------------------------
230 // ciObjectFactory::get
231 //
232 // Get the ciObject corresponding to some oop. If the ciObject has
233 // already been created, it is returned. Otherwise, a new ciObject
234 // is created.
235 ciObject* ciObjectFactory::get(oop key) {
236 ASSERT_IN_VM;
237
238 assert(Universe::heap()->is_in(key), "must be");
239
240 NonPermObject* &bucket = find_non_perm(key);
241 if (bucket != nullptr) {
242 return bucket->object();
243 }
244
245 // The ciObject does not yet exist. Create it and insert it
246 // into the cache.
247 Handle keyHandle(Thread::current(), key);
248 ciObject* new_object = create_new_object(keyHandle());
249 assert(keyHandle() == new_object->get_oop(), "must be properly recorded");
250 init_ident_of(new_object);
251 assert(Universe::heap()->is_in(new_object->get_oop()), "must be");
252
253 // Not a perm-space object.
254 insert_non_perm(bucket, keyHandle(), new_object);
255 notice_new_object(new_object);
256 return new_object;
257 }
258
259 void ciObjectFactory::notice_new_object(ciBaseObject* new_object) {
260 if (RecordTraining) {
261 ciEnv* env = ciEnv::current();
262 if (env->task() != nullptr) {
263 // Note: task will be null during init_compiler_runtime.
264 CompileTrainingData* tdata = env->task()->training_data();
265 if (tdata != nullptr) {
266 tdata->notice_jit_observation(env, new_object);
267 }
268 }
269 }
270 }
271
272 int ciObjectFactory::metadata_compare(Metadata* const& key, ciMetadata* const& elt) {
273 Metadata* value = elt->constant_encoding();
274 if (key < value) return -1;
275 else if (key > value) return 1;
276 else return 0;
277 }
278
279 // ------------------------------------------------------------------
280 // ciObjectFactory::cached_metadata
281 //
282 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
283 // already been created, it is returned. Otherwise, null is returned.
284 ciMetadata* ciObjectFactory::cached_metadata(Metadata* key) {
285 ASSERT_IN_VM;
286
287 bool found = false;
288 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
289
290 if (!found) {
291 return nullptr;
292 }
293 return _ci_metadata.at(index)->as_metadata();
294 }
295
296
297 // ------------------------------------------------------------------
298 // ciObjectFactory::get_metadata
299 //
300 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
301 // already been created, it is returned. Otherwise, a new ciMetadata
302 // is created.
303 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
304 ASSERT_IN_VM;
305
306 if (ReplayCompiles && key->is_klass()) {
307 Klass* k = (Klass*)key;
308 if (k->is_instance_klass() && ciReplay::is_klass_unresolved((InstanceKlass*)k)) {
309 // Klass was unresolved at replay dump time. Simulate this case.
310 return ciEnv::_unloaded_ciinstance_klass;
311 }
312 }
313
314 #ifdef ASSERT
315 if (CIObjectFactoryVerify) {
316 Metadata* last = nullptr;
317 for (int j = 0; j < _ci_metadata.length(); j++) {
318 Metadata* o = _ci_metadata.at(j)->constant_encoding();
319 assert(last < o, "out of order");
320 last = o;
321 }
322 }
323 #endif // ASSERT
324 int len = _ci_metadata.length();
325 bool found = false;
326 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
327 #ifdef ASSERT
328 if (CIObjectFactoryVerify) {
329 for (int i = 0; i < _ci_metadata.length(); i++) {
330 if (_ci_metadata.at(i)->constant_encoding() == key) {
331 assert(index == i, " bad lookup");
332 }
333 }
334 }
335 #endif
336
337 if (!found) {
338 // The ciMetadata does not yet exist. Create it and insert it
339 // into the cache.
340 ciMetadata* new_object = create_new_metadata(key);
341 init_ident_of(new_object);
342 assert(new_object->is_metadata(), "must be");
343
344 if (len != _ci_metadata.length()) {
345 // creating the new object has recursively entered new objects
346 // into the table. We need to recompute our index.
347 index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
348 }
349 assert(!found, "no double insert");
350 _ci_metadata.insert_before(index, new_object);
351 notice_new_object(new_object);
352 return new_object;
353 }
354 return _ci_metadata.at(index)->as_metadata();
355 }
356
357 // ------------------------------------------------------------------
358 // ciObjectFactory::create_new_object
359 //
360 // Create a new ciObject from an oop.
361 //
362 // Implementation note: this functionality could be virtual behavior
363 // of the oop itself. For now, we explicitly marshal the object.
364 ciObject* ciObjectFactory::create_new_object(oop o) {
365 EXCEPTION_CONTEXT;
366
367 if (o->is_instance()) {
368 instanceHandle h_i(THREAD, (instanceOop)o);
369 if (java_lang_invoke_CallSite::is_instance(o))
370 return new (arena()) ciCallSite(h_i);
371 else if (java_lang_invoke_MemberName::is_instance(o))
372 return new (arena()) ciMemberName(h_i);
373 else if (java_lang_invoke_MethodHandle::is_instance(o))
374 return new (arena()) ciMethodHandle(h_i);
375 else if (java_lang_invoke_MethodType::is_instance(o))
376 return new (arena()) ciMethodType(h_i);
377 else
378 return new (arena()) ciInstance(h_i);
379 } else if (o->is_objArray()) {
380 objArrayHandle h_oa(THREAD, (objArrayOop)o);
381 return new (arena()) ciObjArray(h_oa);
382 } else if (o->is_typeArray()) {
383 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
384 return new (arena()) ciTypeArray(h_ta);
385 }
386
387 // The oop is of some type not supported by the compiler interface.
388 ShouldNotReachHere();
389 return nullptr;
390 }
391
392 // ------------------------------------------------------------------
393 // ciObjectFactory::create_new_metadata
394 //
395 // Create a new ciMetadata from a Metadata*.
396 //
397 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
398 // is used, which points to it's holder.
399 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
400 EXCEPTION_CONTEXT;
401
402 if (o->is_klass()) {
403 Klass* k = (Klass*)o;
404 if (k->is_instance_klass()) {
405 assert(!ReplayCompiles || ciReplay::no_replay_state() || !ciReplay::is_klass_unresolved((InstanceKlass*)k), "must be whitelisted for replay compilation");
406 return new (arena()) ciInstanceKlass(k);
407 } else if (k->is_objArray_klass()) {
408 return new (arena()) ciObjArrayKlass(k);
409 } else if (k->is_typeArray_klass()) {
410 return new (arena()) ciTypeArrayKlass(k);
411 }
412 } else if (o->is_method()) {
413 methodHandle h_m(THREAD, (Method*)o);
414 ciEnv *env = CURRENT_THREAD_ENV;
415 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
416 return new (arena()) ciMethod(h_m, holder);
417 } else if (o->is_methodData()) {
418 // Hold methodHandle alive - might not be necessary ???
419 methodHandle h_m(THREAD, ((MethodData*)o)->method());
420 return new (arena()) ciMethodData((MethodData*)o);
421 }
422
423 // The Metadata* is of some type not supported by the compiler interface.
424 ShouldNotReachHere();
425 return nullptr;
426 }
427
428 //------------------------------------------------------------------
429 // ciObjectFactory::get_unloaded_method
430 //
431 // Get the ciMethod representing an unloaded/unfound method.
432 //
433 // Implementation note: unloaded methods are currently stored in
434 // an unordered array, requiring a linear-time lookup for each
435 // unloaded method. This may need to change.
436 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
437 ciSymbol* name,
438 ciSymbol* signature,
439 ciInstanceKlass* accessor) {
440 assert(accessor != nullptr, "need origin of access");
441 ciSignature* that = nullptr;
442 for (int i = 0; i < _unloaded_methods.length(); i++) {
443 ciMethod* entry = _unloaded_methods.at(i);
444 if (entry->holder()->equals(holder) &&
445 entry->name()->equals(name) &&
446 entry->signature()->as_symbol()->equals(signature)) {
447 // Short-circuit slow resolve.
448 if (entry->signature()->accessing_klass() == accessor) {
449 // We've found a match.
450 return entry;
451 } else {
452 // Lazily create ciSignature
453 if (that == nullptr) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
454 if (entry->signature()->equals(that)) {
455 // We've found a match.
456 return entry;
457 }
458 }
459 }
460 }
461
462 // This is a new unloaded method. Create it and stick it in
463 // the cache.
464 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
465
466 init_ident_of(new_method);
467 _unloaded_methods.append(new_method);
468
469 return new_method;
470 }
471
472 //------------------------------------------------------------------
473 // ciObjectFactory::get_unloaded_klass
474 //
475 // Get a ciKlass representing an unloaded klass.
476 //
477 // Implementation note: unloaded klasses are currently stored in
478 // an unordered array, requiring a linear-time lookup for each
479 // unloaded klass. This may need to change.
480 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
481 ciSymbol* name,
482 bool create_if_not_found) {
483 EXCEPTION_CONTEXT;
484 oop loader = nullptr;
485 oop domain = nullptr;
486 if (accessing_klass != nullptr) {
487 loader = accessing_klass->loader();
488 domain = accessing_klass->protection_domain();
489 }
490 for (int i = 0; i < _unloaded_klasses.length(); i++) {
491 ciKlass* entry = _unloaded_klasses.at(i);
492 if (entry->name()->equals(name) &&
493 entry->loader() == loader &&
494 entry->protection_domain() == domain) {
495 // We've found a match.
496 return entry;
497 }
498 }
499
500 if (!create_if_not_found)
501 return nullptr;
502
503 // This is a new unloaded klass. Create it and stick it in
504 // the cache.
505 ciKlass* new_klass = nullptr;
506
507 // Two cases: this is an unloaded ObjArrayKlass or an
508 // unloaded InstanceKlass. Deal with both.
509 if (name->char_at(0) == JVM_SIGNATURE_ARRAY) {
510 // Decompose the name.'
511 SignatureStream ss(name->get_symbol(), false);
512 int dimension = ss.skip_array_prefix(); // skip all '['s
513 BasicType element_type = ss.type();
514 assert(element_type != T_ARRAY, "unsuccessful decomposition");
515 ciKlass* element_klass = nullptr;
516 if (element_type == T_OBJECT) {
517 ciEnv *env = CURRENT_THREAD_ENV;
518 ciSymbol* ci_name = env->get_symbol(ss.as_symbol());
519 element_klass =
520 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
521 } else {
522 assert(dimension > 1, "one dimensional type arrays are always loaded.");
523
524 // The type array itself takes care of one of the dimensions.
525 dimension--;
526
527 // The element klass is a TypeArrayKlass.
528 element_klass = ciTypeArrayKlass::make(element_type);
529 }
530 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
531 } else {
532 jobject loader_handle = nullptr;
533 jobject domain_handle = nullptr;
534 if (accessing_klass != nullptr) {
535 loader_handle = accessing_klass->loader_handle();
536 domain_handle = accessing_klass->protection_domain_handle();
537 }
538 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle);
539 }
540 init_ident_of(new_klass);
541 _unloaded_klasses.append(new_klass);
542
543 return new_klass;
544 }
545
546
547 //------------------------------------------------------------------
548 // ciObjectFactory::get_unloaded_instance
549 //
550 // Get a ciInstance representing an as-yet undetermined instance of a given class.
551 //
552 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
553 for (int i = 0; i < _unloaded_instances.length(); i++) {
554 ciInstance* entry = _unloaded_instances.at(i);
555 if (entry->klass()->equals(instance_klass)) {
556 // We've found a match.
557 return entry;
558 }
559 }
560
561 // This is a new unloaded instance. Create it and stick it in
562 // the cache.
563 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
564
565 init_ident_of(new_instance);
566 _unloaded_instances.append(new_instance);
567
568 // make sure it looks the way we want:
569 assert(!new_instance->is_loaded(), "");
570 assert(new_instance->klass() == instance_klass, "");
571
572 return new_instance;
573 }
574
575
576 //------------------------------------------------------------------
577 // ciObjectFactory::get_unloaded_klass_mirror
578 //
579 // Get a ciInstance representing an unresolved klass mirror.
580 //
581 // Currently, this ignores the parameters and returns a unique unloaded instance.
582 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
583 assert(ciEnv::_Class_klass != nullptr, "");
584 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
585 }
586
587 //------------------------------------------------------------------
588 // ciObjectFactory::get_unloaded_method_handle_constant
589 //
590 // Get a ciInstance representing an unresolved method handle constant.
591 //
592 // Currently, this ignores the parameters and returns a unique unloaded instance.
593 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
594 ciSymbol* name,
595 ciSymbol* signature,
596 int ref_kind) {
597 assert(ciEnv::_MethodHandle_klass != nullptr, "");
598 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
599 }
600
601 //------------------------------------------------------------------
602 // ciObjectFactory::get_unloaded_method_type_constant
603 //
604 // Get a ciInstance representing an unresolved method type constant.
605 //
606 // Currently, this ignores the parameters and returns a unique unloaded instance.
607 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
608 assert(ciEnv::_MethodType_klass != nullptr, "");
609 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
610 }
611
612 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
613 assert(ciEnv::_Object_klass != nullptr, "");
614 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
615 }
616
617 //------------------------------------------------------------------
618 // ciObjectFactory::get_empty_methodData
619 //
620 // Get the ciMethodData representing the methodData for a method with
621 // none.
622 ciMethodData* ciObjectFactory::get_empty_methodData() {
623 ciMethodData* new_methodData = new (arena()) ciMethodData();
624 init_ident_of(new_methodData);
625 return new_methodData;
626 }
627
628 //------------------------------------------------------------------
629 // ciObjectFactory::get_return_address
630 //
631 // Get a ciReturnAddress for a specified bci.
632 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
633 for (int i = 0; i < _return_addresses.length(); i++) {
634 ciReturnAddress* entry = _return_addresses.at(i);
635 if (entry->bci() == bci) {
636 // We've found a match.
637 return entry;
638 }
639 }
640
641 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
642 init_ident_of(new_ret_addr);
643 _return_addresses.append(new_ret_addr);
644 return new_ret_addr;
645 }
646
647 // ------------------------------------------------------------------
648 // ciObjectFactory::init_ident_of
649 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
650 obj->set_ident(_next_ident++);
651 }
652
653 static ciObjectFactory::NonPermObject* emptyBucket = nullptr;
654
655 // ------------------------------------------------------------------
656 // ciObjectFactory::find_non_perm
657 //
658 // Use a small hash table, hashed on the klass of the key.
659 // If there is no entry in the cache corresponding to this oop, return
660 // the null tail of the bucket into which the oop should be inserted.
661 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
662 assert(Universe::heap()->is_in(key), "must be");
663 ciMetadata* klass = get_metadata(key->klass());
664 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
665 for (NonPermObject* p; (p = (*bp)) != nullptr; bp = &p->next()) {
666 if (is_equal(p, key)) break;
667 }
668 return (*bp);
669 }
670
671
672
673 // ------------------------------------------------------------------
674 // Code for for NonPermObject
675 //
676 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
677 assert(ciObjectFactory::is_initialized(), "");
678 _object = object;
679 _next = bucket;
680 bucket = this;
681 }
682
683
684
685 // ------------------------------------------------------------------
686 // ciObjectFactory::insert_non_perm
687 //
688 // Insert a ciObject into the non-perm table.
689 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
690 assert(Universe::heap()->is_in_or_null(key), "must be");
691 assert(&where != &emptyBucket, "must not try to fill empty bucket");
692 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
693 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
694 assert(find_non_perm(key) == p, "must find the same spot");
695 ++_non_perm_count;
696 }
697
698 // ------------------------------------------------------------------
699 // ciObjectFactory::vm_symbol_at
700 // Get the ciSymbol corresponding to some index in vmSymbols.
701 ciSymbol* ciObjectFactory::vm_symbol_at(vmSymbolID sid) {
702 int index = vmSymbols::as_int(sid);
703 return _shared_ci_symbols[index];
704 }
705
706 // ------------------------------------------------------------------
707 // ciObjectFactory::metadata_do
708 void ciObjectFactory::metadata_do(MetadataClosure* f) {
709 for (int j = 0; j < _ci_metadata.length(); j++) {
710 Metadata* o = _ci_metadata.at(j)->constant_encoding();
711 f->do_metadata(o);
712 }
713 }
714
715 // ------------------------------------------------------------------
716 // ciObjectFactory::print_contents_impl
717 void ciObjectFactory::print_contents_impl() {
718 int len = _ci_metadata.length();
719 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
720 for (int i = 0; i < len; i++) {
721 _ci_metadata.at(i)->print();
722 tty->cr();
723 }
724 }
725
726 // ------------------------------------------------------------------
727 // ciObjectFactory::print_contents
728 void ciObjectFactory::print_contents() {
729 print();
730 tty->cr();
731 GUARDED_VM_ENTRY(print_contents_impl();)
732 }
733
734 // ------------------------------------------------------------------
735 // ciObjectFactory::print
736 //
737 // Print debugging information about the object factory
738 void ciObjectFactory::print() {
739 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
740 _non_perm_count, _ci_metadata.length(), _unloaded_methods.length(),
741 _unloaded_instances.length(),
742 _unloaded_klasses.length());
743 }