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/ciFlatArray.hpp"
27 #include "ci/ciFlatArrayKlass.hpp"
28 #include "ci/ciInlineKlass.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/ciRefArrayKlass.hpp"
42 #include "ci/ciReplay.hpp"
43 #include "ci/ciSymbol.hpp"
44 #include "ci/ciSymbols.hpp"
45 #include "ci/ciTypeArray.hpp"
46 #include "ci/ciTypeArrayKlass.hpp"
47 #include "ci/ciUtilities.inline.hpp"
48 #include "classfile/javaClasses.inline.hpp"
49 #include "classfile/vmClasses.hpp"
50 #include "compiler/compiler_globals.hpp"
51 #include "compiler/compileTask.hpp"
52 #include "gc/shared/collectedHeap.inline.hpp"
53 #include "memory/allocation.inline.hpp"
54 #include "memory/universe.hpp"
55 #include "oops/oop.inline.hpp"
56 #include "oops/trainingData.hpp"
57 #include "runtime/handles.inline.hpp"
58 #include "runtime/signature.hpp"
59 #include "utilities/macros.hpp"
60
61 // ciObjectFactory
62 //
63 // This class handles requests for the creation of new instances
64 // of ciObject and its subclasses. It contains a caching mechanism
65 // which ensures that for each oop, at most one ciObject is created.
66 // This invariant allows more efficient implementation of ciObject.
67 //
68 // Implementation note: the oop->ciObject mapping is represented as
69 // a table stored in an array. Even though objects are moved
70 // by the garbage collector, the compactor preserves their relative
71 // order; address comparison of oops (in perm space) is safe so long
72 // as we prohibit GC during our comparisons. We currently use binary
73 // search to find the oop in the table, and inserting a new oop
74 // into the table may be costly. If this cost ends up being
75 // problematic the underlying data structure can be switched to some
76 // sort of balanced binary tree.
77
78 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = nullptr;
79 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::number_of_symbols()];
80 int ciObjectFactory::_shared_ident_limit = 0;
81 volatile bool ciObjectFactory::_initialized = false;
82
83
84 // ------------------------------------------------------------------
85 // ciObjectFactory::ciObjectFactory
86 ciObjectFactory::ciObjectFactory(Arena* arena,
87 int expected_size)
88 : _arena(arena),
89 _ci_metadata(arena, expected_size, 0, nullptr),
90 _unloaded_methods(arena, 4, 0, nullptr),
91 _unloaded_klasses(arena, 8, 0, nullptr),
92 _unloaded_instances(arena, 4, 0, nullptr),
93 _return_addresses(arena, 8, 0, nullptr),
94 _symbols(arena, 100, 0, nullptr),
95 _next_ident(_shared_ident_limit),
96 _non_perm_count(0) {
97 for (int i = 0; i < NON_PERM_BUCKETS; i++) {
98 _non_perm_bucket[i] = nullptr;
99 }
100
101 // If the shared ci objects exist append them to this factory's objects
102 if (_shared_ci_metadata != nullptr) {
103 _ci_metadata.appendAll(_shared_ci_metadata);
104 }
105 }
106
107 // ------------------------------------------------------------------
108 // ciObjectFactory::ciObjectFactory
109 void ciObjectFactory::initialize() {
110 ASSERT_IN_VM;
111 JavaThread* thread = JavaThread::current();
112 HandleMark handle_mark(thread);
113
114 // This Arena is long lived and exists in the resource mark of the
115 // compiler thread that initializes the initial ciObjectFactory which
116 // creates the shared ciObjects that all later ciObjectFactories use.
117 Arena* arena = new (mtCompiler) Arena(mtCompiler);
118 ciEnv initial(arena);
119 ciEnv* env = ciEnv::current();
120 env->_factory->init_shared_objects();
121
122 _initialized = true;
123
124 }
125
126 void ciObjectFactory::init_shared_objects() {
127
128 _next_ident = 1; // start numbering CI objects at 1
129
130 {
131 // Create the shared symbols, but not in _shared_ci_metadata.
132 for (auto index : EnumRange<vmSymbolID>{}) {
133 Symbol* vmsym = vmSymbols::symbol_at(index);
134 assert(vmSymbols::find_sid(vmsym) == index, "1-1 mapping");
135 ciSymbol* sym = new (_arena) ciSymbol(vmsym, index);
136 init_ident_of(sym);
137 _shared_ci_symbols[vmSymbols::as_int(index)] = sym;
138 }
139 #ifdef ASSERT
140 for (auto index : EnumRange<vmSymbolID>{}) {
141 Symbol* vmsym = vmSymbols::symbol_at(index);
142 ciSymbol* sym = vm_symbol_at(index);
143 assert(sym->get_symbol() == vmsym, "oop must match");
144 }
145 assert(ciSymbols::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
146 #endif
147 }
148
149 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
150 BasicType t = (BasicType)i;
151 if (type2name(t) != nullptr && t != T_FLAT_ELEMENT && !is_reference_type(t) &&
152 t != T_NARROWOOP && t != T_NARROWKLASS) {
153 ciType::_basic_types[t] = new (_arena) ciType(t);
154 init_ident_of(ciType::_basic_types[t]);
155 }
156 }
157
158 ciEnv::_null_object_instance = new (_arena) ciNullObject();
159 init_ident_of(ciEnv::_null_object_instance);
160
161 #define VM_CLASS_DEFN(name, ignore_s) \
162 if (vmClasses::name##_is_loaded()) \
163 ciEnv::_##name = get_metadata(vmClasses::name())->as_instance_klass();
164
165 VM_CLASSES_DO(VM_CLASS_DEFN)
166 #undef VM_CLASS_DEFN
167
168 for (int len = -1; len != _ci_metadata.length(); ) {
169 len = _ci_metadata.length();
170 for (int i2 = 0; i2 < len; i2++) {
171 ciMetadata* obj = _ci_metadata.at(i2);
172 assert (obj->is_metadata(), "what else would it be?");
173 if (obj->is_loaded() && obj->is_instance_klass()) {
174 obj->as_instance_klass()->compute_nonstatic_fields();
175 obj->as_instance_klass()->transitive_interfaces();
176 }
177 }
178 }
179
180 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol());
181 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents
182 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, nullptr);
183 init_ident_of(ciEnv::_unloaded_ciinstance_klass);
184 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
185 init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
186 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
187
188 get_metadata(Universe::boolArrayKlass());
189 get_metadata(Universe::charArrayKlass());
190 get_metadata(Universe::floatArrayKlass());
191 get_metadata(Universe::doubleArrayKlass());
192 get_metadata(Universe::byteArrayKlass());
193 get_metadata(Universe::shortArrayKlass());
194 get_metadata(Universe::intArrayKlass());
195 get_metadata(Universe::longArrayKlass());
196
197 assert(_non_perm_count == 0, "no shared non-perm objects");
198
199 // The shared_ident_limit is the first ident number that will
200 // be used for non-shared objects. That is, numbers less than
201 // this limit are permanently assigned to shared CI objects,
202 // while the higher numbers are recycled afresh by each new ciEnv.
203
204 _shared_ident_limit = _next_ident;
205 _shared_ci_metadata = &_ci_metadata;
206 }
207
208
209 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) {
210 vmSymbolID sid = vmSymbols::find_sid(key);
211 if (sid != vmSymbolID::NO_SID) {
212 // do not pollute the main cache with it
213 return vm_symbol_at(sid);
214 }
215
216 assert(vmSymbols::find_sid(key) == vmSymbolID::NO_SID, "");
217 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbolID::NO_SID);
218 _symbols.push(s);
219 return s;
220 }
221
222 // Decrement the refcount when done on symbols referenced by this compilation.
223 void ciObjectFactory::remove_symbols() {
224 for (int i = 0; i < _symbols.length(); i++) {
225 ciSymbol* s = _symbols.at(i);
226 s->get_symbol()->decrement_refcount();
227 }
228 // Since _symbols is resource allocated we're not allowed to delete it
229 // but it'll go away just the same.
230 }
231
232 // ------------------------------------------------------------------
233 // ciObjectFactory::get
234 //
235 // Get the ciObject corresponding to some oop. If the ciObject has
236 // already been created, it is returned. Otherwise, a new ciObject
237 // is created.
238 ciObject* ciObjectFactory::get(oop key) {
239 ASSERT_IN_VM;
240
241 Handle keyHandle(Thread::current(), key);
242 assert(Universe::heap()->is_in(keyHandle()), "must be");
243
244 NonPermObject* &bucket = find_non_perm(keyHandle);
245 if (bucket != nullptr) {
246 return bucket->object();
247 }
248
249 // The ciObject does not yet exist. Create it and insert it
250 // into the cache.
251 ciObject* new_object = create_new_object(keyHandle());
252 assert(keyHandle() == new_object->get_oop(), "must be properly recorded");
253 init_ident_of(new_object);
254 assert(Universe::heap()->is_in(new_object->get_oop()), "must be");
255
256 // Not a perm-space object.
257 insert_non_perm(bucket, keyHandle, new_object);
258 notice_new_object(new_object);
259 return new_object;
260 }
261
262 void ciObjectFactory::notice_new_object(ciBaseObject* new_object) {
263 if (TrainingData::need_data()) {
264 ciEnv* env = ciEnv::current();
265 if (env->task() != nullptr) {
266 // Note: task will be null during init_compiler_runtime.
267 CompileTrainingData* td = env->task()->training_data();
268 if (td != nullptr) {
269 td->notice_jit_observation(env, new_object);
270 }
271 }
272 }
273 }
274
275 int ciObjectFactory::metadata_compare(Metadata* const& key, ciMetadata* const& elt) {
276 Metadata* value = elt->constant_encoding();
277 if (key < value) return -1;
278 else if (key > value) return 1;
279 else return 0;
280 }
281
282 // ------------------------------------------------------------------
283 // ciObjectFactory::cached_metadata
284 //
285 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
286 // already been created, it is returned. Otherwise, null is returned.
287 ciMetadata* ciObjectFactory::cached_metadata(Metadata* key) {
288 ASSERT_IN_VM;
289
290 bool found = false;
291 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
292
293 if (!found) {
294 return nullptr;
295 }
296 return _ci_metadata.at(index)->as_metadata();
297 }
298
299
300 // ------------------------------------------------------------------
301 // ciObjectFactory::get_metadata
302 //
303 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
304 // already been created, it is returned. Otherwise, a new ciMetadata
305 // is created.
306 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
307 ASSERT_IN_VM;
308
309 if (ReplayCompiles && key->is_klass()) {
310 Klass* k = (Klass*)key;
311 if (k->is_instance_klass() && ciReplay::is_klass_unresolved((InstanceKlass*)k)) {
312 // Klass was unresolved at replay dump time. Simulate this case.
313 return ciEnv::_unloaded_ciinstance_klass;
314 }
315 }
316
317 #ifdef ASSERT
318 if (CIObjectFactoryVerify) {
319 Metadata* last = nullptr;
320 for (int j = 0; j < _ci_metadata.length(); j++) {
321 Metadata* o = _ci_metadata.at(j)->constant_encoding();
322 assert(last < o, "out of order");
323 last = o;
324 }
325 }
326 #endif // ASSERT
327 int len = _ci_metadata.length();
328 bool found = false;
329 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
330 #ifdef ASSERT
331 if (CIObjectFactoryVerify) {
332 for (int i = 0; i < _ci_metadata.length(); i++) {
333 if (_ci_metadata.at(i)->constant_encoding() == key) {
334 assert(index == i, " bad lookup");
335 }
336 }
337 }
338 #endif
339
340 if (!found) {
341 // The ciMetadata does not yet exist. Create it and insert it
342 // into the cache.
343 ciMetadata* new_object = create_new_metadata(key);
344 init_ident_of(new_object);
345 assert(new_object->is_metadata(), "must be");
346
347 if (len != _ci_metadata.length()) {
348 // creating the new object has recursively entered new objects
349 // into the table. We need to recompute our index.
350 index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
351 }
352 assert(!found, "no double insert");
353 _ci_metadata.insert_before(index, new_object);
354 notice_new_object(new_object);
355 return new_object;
356 }
357 return _ci_metadata.at(index)->as_metadata();
358 }
359
360 // ------------------------------------------------------------------
361 // ciObjectFactory::create_new_object
362 //
363 // Create a new ciObject from an oop.
364 //
365 // Implementation note: this functionality could be virtual behavior
366 // of the oop itself. For now, we explicitly marshal the object.
367 ciObject* ciObjectFactory::create_new_object(oop o) {
368 EXCEPTION_CONTEXT;
369
370 if (o->is_instance()) {
371 instanceHandle h_i(THREAD, (instanceOop)o);
372 if (java_lang_invoke_CallSite::is_instance(o))
373 return new (arena()) ciCallSite(h_i);
374 else if (java_lang_invoke_MemberName::is_instance(o))
375 return new (arena()) ciMemberName(h_i);
376 else if (java_lang_invoke_MethodHandle::is_instance(o))
377 return new (arena()) ciMethodHandle(h_i);
378 else if (java_lang_invoke_MethodType::is_instance(o))
379 return new (arena()) ciMethodType(h_i);
380 else
381 return new (arena()) ciInstance(h_i);
382 } else if (o->is_refArray()) {
383 objArrayHandle h_oa(THREAD, (objArrayOop)o);
384 return new (arena()) ciObjArray(h_oa);
385 } else if (o->is_typeArray()) {
386 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
387 return new (arena()) ciTypeArray(h_ta);
388 } else if (o->is_flatArray()) {
389 flatArrayHandle h_ta(THREAD, (flatArrayOop)o);
390 return new (arena()) ciFlatArray(h_ta);
391 }
392
393 // The oop is of some type not supported by the compiler interface.
394 ShouldNotReachHere();
395 return nullptr;
396 }
397
398 // ------------------------------------------------------------------
399 // ciObjectFactory::create_new_metadata
400 //
401 // Create a new ciMetadata from a Metadata*.
402 //
403 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
404 // is used, which points to it's holder.
405 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
406 EXCEPTION_CONTEXT;
407
408 if (o->is_klass()) {
409 Klass* k = (Klass*)o;
410 if (k->is_inline_klass()) {
411 return new (arena()) ciInlineKlass(k);
412 } else if (k->is_instance_klass()) {
413 assert(!ReplayCompiles || ciReplay::no_replay_state() || !ciReplay::is_klass_unresolved((InstanceKlass*)k), "must be whitelisted for replay compilation");
414 return new (arena()) ciInstanceKlass(k);
415 } else if (k->is_objArray_klass()) {
416 if (k->is_flatArray_klass()) {
417 return new (arena()) ciFlatArrayKlass(k);
418 } else if (k->is_refArray_klass()) {
419 return new (arena()) ciRefArrayKlass(k);
420 } else {
421 return new (arena()) ciObjArrayKlass(k);
422 }
423 } else if (k->is_typeArray_klass()) {
424 return new (arena()) ciTypeArrayKlass(k);
425 }
426 } else if (o->is_method()) {
427 methodHandle h_m(THREAD, (Method*)o);
428 ciEnv *env = CURRENT_THREAD_ENV;
429 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
430 return new (arena()) ciMethod(h_m, holder);
431 } else if (o->is_methodData()) {
432 // Hold methodHandle alive - might not be necessary ???
433 methodHandle h_m(THREAD, ((MethodData*)o)->method());
434 return new (arena()) ciMethodData((MethodData*)o);
435 }
436
437 // The Metadata* is of some type not supported by the compiler interface.
438 ShouldNotReachHere();
439 return nullptr;
440 }
441
442 //------------------------------------------------------------------
443 // ciObjectFactory::get_unloaded_method
444 //
445 // Get the ciMethod representing an unloaded/unfound method.
446 //
447 // Implementation note: unloaded methods are currently stored in
448 // an unordered array, requiring a linear-time lookup for each
449 // unloaded method. This may need to change.
450 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
451 ciSymbol* name,
452 ciSymbol* signature,
453 ciInstanceKlass* accessor) {
454 assert(accessor != nullptr, "need origin of access");
455 ciSignature* that = nullptr;
456 for (int i = 0; i < _unloaded_methods.length(); i++) {
457 ciMethod* entry = _unloaded_methods.at(i);
458 if (entry->holder()->equals(holder) &&
459 entry->name()->equals(name) &&
460 entry->signature()->as_symbol()->equals(signature)) {
461 // Short-circuit slow resolve.
462 if (entry->signature()->accessing_klass() == accessor) {
463 // We've found a match.
464 return entry;
465 } else {
466 // Lazily create ciSignature
467 if (that == nullptr) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
468 if (entry->signature()->equals(that)) {
469 // We've found a match.
470 return entry;
471 }
472 }
473 }
474 }
475
476 // This is a new unloaded method. Create it and stick it in
477 // the cache.
478 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
479
480 init_ident_of(new_method);
481 _unloaded_methods.append(new_method);
482
483 return new_method;
484 }
485
486 //------------------------------------------------------------------
487 // ciObjectFactory::get_unloaded_klass
488 //
489 // Get a ciKlass representing an unloaded klass.
490 //
491 // Implementation note: unloaded klasses are currently stored in
492 // an unordered array, requiring a linear-time lookup for each
493 // unloaded klass. This may need to change.
494 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
495 ciSymbol* name,
496 bool create_if_not_found) {
497 EXCEPTION_CONTEXT;
498 oop loader = nullptr;
499 oop domain = nullptr;
500 if (accessing_klass != nullptr) {
501 loader = accessing_klass->loader();
502 }
503 for (int i = 0; i < _unloaded_klasses.length(); i++) {
504 ciKlass* entry = _unloaded_klasses.at(i);
505 if (entry->name()->equals(name) &&
506 entry->loader() == loader) {
507 // We've found a match.
508 return entry;
509 }
510 }
511
512 if (!create_if_not_found)
513 return nullptr;
514
515 // This is a new unloaded klass. Create it and stick it in
516 // the cache.
517 ciKlass* new_klass = nullptr;
518
519 // Two cases: this is an unloaded ObjArrayKlass or an
520 // unloaded InstanceKlass. Deal with both.
521 if (name->char_at(0) == JVM_SIGNATURE_ARRAY) {
522 // Decompose the name.'
523 SignatureStream ss(name->get_symbol(), false);
524 int dimension = ss.skip_array_prefix(); // skip all '['s
525 BasicType element_type = ss.type();
526 assert(element_type != T_ARRAY, "unsuccessful decomposition");
527 ciKlass* element_klass = nullptr;
528 if (element_type == T_OBJECT) {
529 ciEnv *env = CURRENT_THREAD_ENV;
530 ciSymbol* ci_name = env->get_symbol(ss.as_symbol());
531 element_klass =
532 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
533 } else {
534 assert(dimension > 1, "one dimensional type arrays are always loaded.");
535
536 // The type array itself takes care of one of the dimensions.
537 dimension--;
538
539 // The element klass is a TypeArrayKlass.
540 element_klass = ciTypeArrayKlass::make(element_type);
541 }
542 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
543 } else {
544 jobject loader_handle = nullptr;
545 if (accessing_klass != nullptr) {
546 loader_handle = accessing_klass->loader_handle();
547 }
548 new_klass = new (arena()) ciInstanceKlass(name, loader_handle);
549 }
550 init_ident_of(new_klass);
551 _unloaded_klasses.append(new_klass);
552
553 return new_klass;
554 }
555
556
557 //------------------------------------------------------------------
558 // ciObjectFactory::get_unloaded_instance
559 //
560 // Get a ciInstance representing an as-yet undetermined instance of a given class.
561 //
562 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
563 for (int i = 0; i < _unloaded_instances.length(); i++) {
564 ciInstance* entry = _unloaded_instances.at(i);
565 if (entry->klass()->equals(instance_klass)) {
566 // We've found a match.
567 return entry;
568 }
569 }
570
571 // This is a new unloaded instance. Create it and stick it in
572 // the cache.
573 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
574
575 init_ident_of(new_instance);
576 _unloaded_instances.append(new_instance);
577
578 // make sure it looks the way we want:
579 assert(!new_instance->is_loaded(), "");
580 assert(new_instance->klass() == instance_klass, "");
581
582 return new_instance;
583 }
584
585
586 //------------------------------------------------------------------
587 // ciObjectFactory::get_unloaded_klass_mirror
588 //
589 // Get a ciInstance representing an unresolved klass mirror.
590 //
591 // Currently, this ignores the parameters and returns a unique unloaded instance.
592 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
593 assert(ciEnv::_Class_klass != nullptr, "");
594 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
595 }
596
597 //------------------------------------------------------------------
598 // ciObjectFactory::get_unloaded_method_handle_constant
599 //
600 // Get a ciInstance representing an unresolved method handle constant.
601 //
602 // Currently, this ignores the parameters and returns a unique unloaded instance.
603 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
604 ciSymbol* name,
605 ciSymbol* signature,
606 int ref_kind) {
607 assert(ciEnv::_MethodHandle_klass != nullptr, "");
608 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
609 }
610
611 //------------------------------------------------------------------
612 // ciObjectFactory::get_unloaded_method_type_constant
613 //
614 // Get a ciInstance representing an unresolved method type constant.
615 //
616 // Currently, this ignores the parameters and returns a unique unloaded instance.
617 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
618 assert(ciEnv::_MethodType_klass != nullptr, "");
619 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
620 }
621
622 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
623 assert(ciEnv::_Object_klass != nullptr, "");
624 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
625 }
626
627 //------------------------------------------------------------------
628 // ciObjectFactory::get_empty_methodData
629 //
630 // Get the ciMethodData representing the methodData for a method with
631 // none.
632 ciMethodData* ciObjectFactory::get_empty_methodData() {
633 ciMethodData* new_methodData = new (arena()) ciMethodData();
634 init_ident_of(new_methodData);
635 return new_methodData;
636 }
637
638 //------------------------------------------------------------------
639 // ciObjectFactory::get_return_address
640 //
641 // Get a ciReturnAddress for a specified bci.
642 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
643 for (int i = 0; i < _return_addresses.length(); i++) {
644 ciReturnAddress* entry = _return_addresses.at(i);
645 if (entry->bci() == bci) {
646 // We've found a match.
647 return entry;
648 }
649 }
650
651 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
652 init_ident_of(new_ret_addr);
653 _return_addresses.append(new_ret_addr);
654 return new_ret_addr;
655 }
656
657 ciWrapper* ciObjectFactory::make_early_larval_wrapper(ciType* type) {
658 ciWrapper* wrapper = new (arena()) ciWrapper(type, ciWrapper::EarlyLarval);
659 init_ident_of(wrapper);
660 return wrapper;
661 }
662
663 ciWrapper* ciObjectFactory::make_null_free_wrapper(ciType* type) {
664 ciWrapper* wrapper = new (arena()) ciWrapper(type, ciWrapper::NullFree);
665 init_ident_of(wrapper);
666 return wrapper;
667 }
668
669 // ------------------------------------------------------------------
670 // ciObjectFactory::init_ident_of
671 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
672 obj->set_ident(_next_ident++);
673 }
674
675 static ciObjectFactory::NonPermObject* emptyBucket = nullptr;
676
677 // ------------------------------------------------------------------
678 // ciObjectFactory::find_non_perm
679 //
680 // Use a small hash table, hashed on the klass of the key.
681 // If there is no entry in the cache corresponding to this oop, return
682 // the null tail of the bucket into which the oop should be inserted.
683 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(Handle keyHandle) {
684 assert(Universe::heap()->is_in(keyHandle()), "must be");
685 ciMetadata* klass = get_metadata(keyHandle->klass()); // This may safepoint!
686 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
687 for (NonPermObject* p; (p = (*bp)) != nullptr; bp = &p->next()) {
688 if (is_equal(p, keyHandle())) break;
689 }
690 return (*bp);
691 }
692
693
694
695 // ------------------------------------------------------------------
696 // Code for for NonPermObject
697 //
698 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
699 assert(ciObjectFactory::is_initialized(), "");
700 _object = object;
701 _next = bucket;
702 bucket = this;
703 }
704
705
706
707 // ------------------------------------------------------------------
708 // ciObjectFactory::insert_non_perm
709 //
710 // Insert a ciObject into the non-perm table.
711 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, Handle keyHandle, ciObject* obj) {
712 assert(Universe::heap()->is_in_or_null(keyHandle()), "must be");
713 assert(&where != &emptyBucket, "must not try to fill empty bucket");
714 NonPermObject* p = new (arena()) NonPermObject(where, keyHandle(), obj);
715 assert(where == p && is_equal(p, keyHandle()) && p->object() == obj, "entry must match");
716 assert(find_non_perm(keyHandle) == p, "must find the same spot");
717 ++_non_perm_count;
718 }
719
720 // ------------------------------------------------------------------
721 // ciObjectFactory::vm_symbol_at
722 // Get the ciSymbol corresponding to some index in vmSymbols.
723 ciSymbol* ciObjectFactory::vm_symbol_at(vmSymbolID sid) {
724 int index = vmSymbols::as_int(sid);
725 return _shared_ci_symbols[index];
726 }
727
728 // ------------------------------------------------------------------
729 // ciObjectFactory::metadata_do
730 void ciObjectFactory::metadata_do(MetadataClosure* f) {
731 for (int j = 0; j < _ci_metadata.length(); j++) {
732 Metadata* o = _ci_metadata.at(j)->constant_encoding();
733 f->do_metadata(o);
734 }
735 }
736
737 // ------------------------------------------------------------------
738 // ciObjectFactory::print_contents_impl
739 void ciObjectFactory::print_contents_impl() {
740 int len = _ci_metadata.length();
741 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
742 for (int i = 0; i < len; i++) {
743 _ci_metadata.at(i)->print();
744 tty->cr();
745 }
746 }
747
748 // ------------------------------------------------------------------
749 // ciObjectFactory::print_contents
750 void ciObjectFactory::print_contents() {
751 print();
752 tty->cr();
753 GUARDED_VM_ENTRY(print_contents_impl();)
754 }
755
756 // ------------------------------------------------------------------
757 // ciObjectFactory::print
758 //
759 // Print debugging information about the object factory
760 void ciObjectFactory::print() {
761 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
762 _non_perm_count, _ci_metadata.length(), _unloaded_methods.length(),
763 _unloaded_instances.length(),
764 _unloaded_klasses.length());
765 }