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.
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23 */
24
25 #include "ci/ciCallSite.hpp"
26 #include "ci/ciInstance.hpp"
27 #include "ci/ciInstanceKlass.hpp"
28 #include "ci/ciMemberName.hpp"
29 #include "ci/ciMethod.hpp"
30 #include "ci/ciMethodData.hpp"
31 #include "ci/ciMethodHandle.hpp"
32 #include "ci/ciMethodType.hpp"
33 #include "ci/ciNullObject.hpp"
34 #include "ci/ciObjArray.hpp"
35 #include "ci/ciObjArrayKlass.hpp"
36 #include "ci/ciObject.hpp"
37 #include "ci/ciObjectFactory.hpp"
38 #include "ci/ciReplay.hpp"
39 #include "ci/ciSymbol.hpp"
40 #include "ci/ciSymbols.hpp"
41 #include "ci/ciTypeArray.hpp"
42 #include "ci/ciTypeArrayKlass.hpp"
43 #include "ci/ciUtilities.inline.hpp"
44 #include "classfile/javaClasses.inline.hpp"
45 #include "classfile/vmClasses.hpp"
46 #include "compiler/compiler_globals.hpp"
47 #include "compiler/compileTask.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 "oops/trainingData.hpp"
53 #include "runtime/handles.inline.hpp"
54 #include "runtime/signature.hpp"
55 #include "utilities/macros.hpp"
56
57 // ciObjectFactory
58 //
59 // This class handles requests for the creation of new instances
60 // of ciObject and its subclasses. It contains a caching mechanism
61 // which ensures that for each oop, at most one ciObject is created.
62 // This invariant allows more efficient implementation of ciObject.
63 //
64 // Implementation note: the oop->ciObject mapping is represented as
65 // a table stored in an array. Even though objects are moved
66 // by the garbage collector, the compactor preserves their relative
67 // order; address comparison of oops (in perm space) is safe so long
68 // as we prohibit GC during our comparisons. We currently use binary
69 // search to find the oop in the table, and inserting a new oop
70 // into the table may be costly. If this cost ends up being
71 // problematic the underlying data structure can be switched to some
72 // sort of balanced binary tree.
73
74 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = nullptr;
75 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::number_of_symbols()];
76 int ciObjectFactory::_shared_ident_limit = 0;
77 volatile bool ciObjectFactory::_initialized = false;
78
79
80 // ------------------------------------------------------------------
81 // ciObjectFactory::ciObjectFactory
82 ciObjectFactory::ciObjectFactory(Arena* arena,
83 int expected_size)
84 : _arena(arena),
85 _ci_metadata(arena, expected_size, 0, nullptr),
86 _unloaded_methods(arena, 4, 0, nullptr),
87 _unloaded_klasses(arena, 8, 0, nullptr),
88 _unloaded_instances(arena, 4, 0, nullptr),
89 _return_addresses(arena, 8, 0, nullptr),
90 _symbols(arena, 100, 0, nullptr),
91 _next_ident(_shared_ident_limit),
92 _non_perm_count(0) {
93 for (int i = 0; i < NON_PERM_BUCKETS; i++) {
94 _non_perm_bucket[i] = nullptr;
95 }
96
97 // If the shared ci objects exist append them to this factory's objects
98 if (_shared_ci_metadata != nullptr) {
99 _ci_metadata.appendAll(_shared_ci_metadata);
100 }
101 }
102
103 // ------------------------------------------------------------------
104 // ciObjectFactory::ciObjectFactory
105 void ciObjectFactory::initialize() {
106 ASSERT_IN_VM;
107 JavaThread* thread = JavaThread::current();
108 HandleMark handle_mark(thread);
109
110 // This Arena is long lived and exists in the resource mark of the
111 // compiler thread that initializes the initial ciObjectFactory which
112 // creates the shared ciObjects that all later ciObjectFactories use.
113 Arena* arena = new (mtCompiler) Arena(mtCompiler);
114 ciEnv initial(arena);
115 ciEnv* env = ciEnv::current();
116 env->_factory->init_shared_objects();
117
118 _initialized = true;
119
120 }
121
122 void ciObjectFactory::init_shared_objects() {
123
124 _next_ident = 1; // start numbering CI objects at 1
125
126 {
127 // Create the shared symbols, but not in _shared_ci_metadata.
128 for (auto index : EnumRange<vmSymbolID>{}) {
129 Symbol* vmsym = vmSymbols::symbol_at(index);
130 assert(vmSymbols::find_sid(vmsym) == index, "1-1 mapping");
131 ciSymbol* sym = new (_arena) ciSymbol(vmsym, index);
132 init_ident_of(sym);
133 _shared_ci_symbols[vmSymbols::as_int(index)] = sym;
134 }
135 #ifdef ASSERT
136 for (auto index : EnumRange<vmSymbolID>{}) {
137 Symbol* vmsym = vmSymbols::symbol_at(index);
138 ciSymbol* sym = vm_symbol_at(index);
139 assert(sym->get_symbol() == vmsym, "oop must match");
140 }
141 assert(ciSymbols::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
142 #endif
143 }
144
145 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
146 BasicType t = (BasicType)i;
147 if (type2name(t) != nullptr && !is_reference_type(t) &&
148 t != T_NARROWOOP && t != T_NARROWKLASS) {
149 ciType::_basic_types[t] = new (_arena) ciType(t);
150 init_ident_of(ciType::_basic_types[t]);
151 }
152 }
153
154 ciEnv::_null_object_instance = new (_arena) ciNullObject();
155 init_ident_of(ciEnv::_null_object_instance);
156
157 #define VM_CLASS_DEFN(name, ignore_s) \
158 if (vmClasses::name##_is_loaded()) { \
159 ciEnv::_##name = get_metadata(vmClasses::name())->as_instance_klass(); \
160 }
161 VM_CLASSES_DO(VM_CLASS_DEFN)
162 #undef VM_CLASS_DEFN
163
164 for (int len = -1; len != _ci_metadata.length(); ) {
165 len = _ci_metadata.length();
166 for (int i2 = 0; i2 < len; i2++) {
167 ciMetadata* obj = _ci_metadata.at(i2);
168 assert (obj->is_metadata(), "what else would it be?");
169 if (obj->is_loaded() && obj->is_instance_klass()) {
170 obj->as_instance_klass()->compute_nonstatic_fields();
171 obj->as_instance_klass()->transitive_interfaces();
172 }
173 }
174 }
175
176 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol());
177 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents
178 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, nullptr);
179 init_ident_of(ciEnv::_unloaded_ciinstance_klass);
180 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
181 init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
182 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
183
184 get_metadata(Universe::boolArrayKlass());
185 get_metadata(Universe::charArrayKlass());
186 get_metadata(Universe::floatArrayKlass());
187 get_metadata(Universe::doubleArrayKlass());
188 get_metadata(Universe::byteArrayKlass());
189 get_metadata(Universe::shortArrayKlass());
190 get_metadata(Universe::intArrayKlass());
191 get_metadata(Universe::longArrayKlass());
192
193 assert(_non_perm_count == 0, "no shared non-perm objects");
194
195 // The shared_ident_limit is the first ident number that will
196 // be used for non-shared objects. That is, numbers less than
197 // this limit are permanently assigned to shared CI objects,
198 // while the higher numbers are recycled afresh by each new ciEnv.
199
200 _shared_ident_limit = _next_ident;
201 _shared_ci_metadata = &_ci_metadata;
202 }
203
204
205 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) {
206 vmSymbolID sid = vmSymbols::find_sid(key);
207 if (sid != vmSymbolID::NO_SID) {
208 // do not pollute the main cache with it
209 return vm_symbol_at(sid);
210 }
211
212 assert(vmSymbols::find_sid(key) == vmSymbolID::NO_SID, "");
213 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbolID::NO_SID);
214 _symbols.push(s);
215 return s;
216 }
217
218 // Decrement the refcount when done on symbols referenced by this compilation.
219 void ciObjectFactory::remove_symbols() {
220 for (int i = 0; i < _symbols.length(); i++) {
221 ciSymbol* s = _symbols.at(i);
222 s->get_symbol()->decrement_refcount();
223 }
224 // Since _symbols is resource allocated we're not allowed to delete it
225 // but it'll go away just the same.
226 }
227
228 // ------------------------------------------------------------------
229 // ciObjectFactory::get
230 //
231 // Get the ciObject corresponding to some oop. If the ciObject has
232 // already been created, it is returned. Otherwise, a new ciObject
233 // is created.
234 ciObject* ciObjectFactory::get(oop key) {
235 ASSERT_IN_VM;
236
237 Handle keyHandle(Thread::current(), key);
238 assert(Universe::heap()->is_in(keyHandle()), "must be");
239
240 NonPermObject* &bucket = find_non_perm(keyHandle);
241 if (bucket != nullptr) {
242 ciObject* obj = bucket->object();
243 notice_object_access(obj);
244 return obj;
245 }
246
247 // The ciObject does not yet exist. Create it and insert it
248 // into the cache.
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 notice_object_access(new_object);
257 return new_object;
258 }
259
260 #if INCLUDE_CDS
261 void ciObjectFactory::notice_object_access(ciBaseObject* new_object) {
262 if (TrainingData::need_data()) {
263 ciEnv* env = ciEnv::current();
264 if (env->task() != nullptr) {
265 // Note: task will be null during init_compiler_runtime.
266 CompileTrainingData* td = env->task()->training_data();
267 if (td != nullptr) {
268 td->notice_jit_observation(env, new_object);
269 }
270 }
271 }
272 }
273 #endif
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_object_access(new_object);
355 return new_object;
356 }
357 ciMetadata* metadata = _ci_metadata.at(index)->as_metadata();
358 notice_object_access(metadata);
359 return metadata;
360 }
361
362 // ------------------------------------------------------------------
363 // ciObjectFactory::create_new_object
364 //
365 // Create a new ciObject from an oop.
366 //
367 // Implementation note: this functionality could be virtual behavior
368 // of the oop itself. For now, we explicitly marshal the object.
369 ciObject* ciObjectFactory::create_new_object(oop o) {
370 EXCEPTION_CONTEXT;
371
372 if (o->is_instance()) {
373 instanceHandle h_i(THREAD, (instanceOop)o);
374 if (java_lang_invoke_CallSite::is_instance(o))
375 return new (arena()) ciCallSite(h_i);
376 else if (java_lang_invoke_MemberName::is_instance(o))
377 return new (arena()) ciMemberName(h_i);
378 else if (java_lang_invoke_MethodHandle::is_instance(o))
379 return new (arena()) ciMethodHandle(h_i);
380 else if (java_lang_invoke_MethodType::is_instance(o))
381 return new (arena()) ciMethodType(h_i);
382 else
383 return new (arena()) ciInstance(h_i);
384 } else if (o->is_objArray()) {
385 objArrayHandle h_oa(THREAD, (objArrayOop)o);
386 return new (arena()) ciObjArray(h_oa);
387 } else if (o->is_typeArray()) {
388 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
389 return new (arena()) ciTypeArray(h_ta);
390 }
391
392 // The oop is of some type not supported by the compiler interface.
393 ShouldNotReachHere();
394 return nullptr;
395 }
396
397 // ------------------------------------------------------------------
398 // ciObjectFactory::create_new_metadata
399 //
400 // Create a new ciMetadata from a Metadata*.
401 //
402 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
403 // is used, which points to it's holder.
404 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
405 EXCEPTION_CONTEXT;
406
407 if (o->is_klass()) {
408 Klass* k = (Klass*)o;
409 if (k->is_instance_klass()) {
410 assert(!ReplayCompiles || ciReplay::no_replay_state() || !ciReplay::is_klass_unresolved((InstanceKlass*)k), "must be whitelisted for replay compilation");
411 return new (arena()) ciInstanceKlass(k);
412 } else if (k->is_objArray_klass()) {
413 return new (arena()) ciObjArrayKlass(k);
414 } else if (k->is_typeArray_klass()) {
415 return new (arena()) ciTypeArrayKlass(k);
416 }
417 } else if (o->is_method()) {
418 methodHandle h_m(THREAD, (Method*)o);
419 ciEnv *env = CURRENT_THREAD_ENV;
420 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
421 return new (arena()) ciMethod(h_m, holder);
422 } else if (o->is_methodData()) {
423 // Callers ciMethod::ensure_method_data() and ::method_data() have MH already.
424 return new (arena()) ciMethodData((MethodData*)o);
425 } else if (o->is_methodCounters()) {
426 // Caller ciMethod::ensure_method_counters() has MH already.
427 return new (arena()) ciMetadata(o);
428 }
429
430 // The Metadata* is of some type not supported by the compiler interface.
431 ShouldNotReachHere();
432 return nullptr;
433 }
434
435 //------------------------------------------------------------------
436 // ciObjectFactory::get_unloaded_method
437 //
438 // Get the ciMethod representing an unloaded/unfound method.
439 //
440 // Implementation note: unloaded methods are currently stored in
441 // an unordered array, requiring a linear-time lookup for each
442 // unloaded method. This may need to change.
443 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
444 ciSymbol* name,
445 ciSymbol* signature,
446 ciInstanceKlass* accessor) {
447 assert(accessor != nullptr, "need origin of access");
448 ciSignature* that = nullptr;
449 for (int i = 0; i < _unloaded_methods.length(); i++) {
450 ciMethod* entry = _unloaded_methods.at(i);
451 if (entry->holder()->equals(holder) &&
452 entry->name()->equals(name) &&
453 entry->signature()->as_symbol()->equals(signature)) {
454 // Short-circuit slow resolve.
455 if (entry->signature()->accessing_klass() == accessor) {
456 // We've found a match.
457 return entry;
458 } else {
459 // Lazily create ciSignature
460 if (that == nullptr) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
461 if (entry->signature()->equals(that)) {
462 // We've found a match.
463 return entry;
464 }
465 }
466 }
467 }
468
469 // This is a new unloaded method. Create it and stick it in
470 // the cache.
471 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
472
473 init_ident_of(new_method);
474 _unloaded_methods.append(new_method);
475
476 return new_method;
477 }
478
479 //------------------------------------------------------------------
480 // ciObjectFactory::get_unloaded_klass
481 //
482 // Get a ciKlass representing an unloaded klass.
483 //
484 // Implementation note: unloaded klasses are currently stored in
485 // an unordered array, requiring a linear-time lookup for each
486 // unloaded klass. This may need to change.
487 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
488 ciSymbol* name,
489 bool create_if_not_found) {
490 EXCEPTION_CONTEXT;
491 oop loader = nullptr;
492 oop domain = nullptr;
493 if (accessing_klass != nullptr) {
494 loader = accessing_klass->loader();
495 }
496 for (int i = 0; i < _unloaded_klasses.length(); i++) {
497 ciKlass* entry = _unloaded_klasses.at(i);
498 if (entry->name()->equals(name) &&
499 entry->loader() == loader) {
500 // We've found a match.
501 return entry;
502 }
503 }
504
505 if (!create_if_not_found)
506 return nullptr;
507
508 // This is a new unloaded klass. Create it and stick it in
509 // the cache.
510 ciKlass* new_klass = nullptr;
511
512 // Two cases: this is an unloaded ObjArrayKlass or an
513 // unloaded InstanceKlass. Deal with both.
514 if (name->char_at(0) == JVM_SIGNATURE_ARRAY) {
515 // Decompose the name.'
516 SignatureStream ss(name->get_symbol(), false);
517 int dimension = ss.skip_array_prefix(); // skip all '['s
518 BasicType element_type = ss.type();
519 assert(element_type != T_ARRAY, "unsuccessful decomposition");
520 ciKlass* element_klass = nullptr;
521 if (element_type == T_OBJECT) {
522 ciEnv *env = CURRENT_THREAD_ENV;
523 ciSymbol* ci_name = env->get_symbol(ss.as_symbol());
524 element_klass =
525 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
526 } else {
527 assert(dimension > 1, "one dimensional type arrays are always loaded.");
528
529 // The type array itself takes care of one of the dimensions.
530 dimension--;
531
532 // The element klass is a TypeArrayKlass.
533 element_klass = ciTypeArrayKlass::make(element_type);
534 }
535 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
536 } else {
537 jobject loader_handle = nullptr;
538 if (accessing_klass != nullptr) {
539 loader_handle = accessing_klass->loader_handle();
540 }
541 new_klass = new (arena()) ciInstanceKlass(name, loader_handle);
542 }
543 init_ident_of(new_klass);
544 _unloaded_klasses.append(new_klass);
545
546 return new_klass;
547 }
548
549
550 //------------------------------------------------------------------
551 // ciObjectFactory::get_unloaded_instance
552 //
553 // Get a ciInstance representing an as-yet undetermined instance of a given class.
554 //
555 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
556 for (int i = 0; i < _unloaded_instances.length(); i++) {
557 ciInstance* entry = _unloaded_instances.at(i);
558 if (entry->klass()->equals(instance_klass)) {
559 // We've found a match.
560 return entry;
561 }
562 }
563
564 // This is a new unloaded instance. Create it and stick it in
565 // the cache.
566 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
567
568 init_ident_of(new_instance);
569 _unloaded_instances.append(new_instance);
570
571 // make sure it looks the way we want:
572 assert(!new_instance->is_loaded(), "");
573 assert(new_instance->klass() == instance_klass, "");
574
575 return new_instance;
576 }
577
578
579 //------------------------------------------------------------------
580 // ciObjectFactory::get_unloaded_klass_mirror
581 //
582 // Get a ciInstance representing an unresolved klass mirror.
583 //
584 // Currently, this ignores the parameters and returns a unique unloaded instance.
585 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
586 assert(ciEnv::_Class_klass != nullptr, "");
587 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
588 }
589
590 //------------------------------------------------------------------
591 // ciObjectFactory::get_unloaded_method_handle_constant
592 //
593 // Get a ciInstance representing an unresolved method handle constant.
594 //
595 // Currently, this ignores the parameters and returns a unique unloaded instance.
596 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
597 ciSymbol* name,
598 ciSymbol* signature,
599 int ref_kind) {
600 assert(ciEnv::_MethodHandle_klass != nullptr, "");
601 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
602 }
603
604 //------------------------------------------------------------------
605 // ciObjectFactory::get_unloaded_method_type_constant
606 //
607 // Get a ciInstance representing an unresolved method type constant.
608 //
609 // Currently, this ignores the parameters and returns a unique unloaded instance.
610 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
611 assert(ciEnv::_MethodType_klass != nullptr, "");
612 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
613 }
614
615 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
616 assert(ciEnv::_Object_klass != nullptr, "");
617 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
618 }
619
620 //------------------------------------------------------------------
621 // ciObjectFactory::get_empty_methodData
622 //
623 // Get the ciMethodData representing the methodData for a method with
624 // none.
625 ciMethodData* ciObjectFactory::get_empty_methodData() {
626 ciMethodData* new_methodData = new (arena()) ciMethodData();
627 init_ident_of(new_methodData);
628 return new_methodData;
629 }
630
631 //------------------------------------------------------------------
632 // ciObjectFactory::get_return_address
633 //
634 // Get a ciReturnAddress for a specified bci.
635 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
636 for (int i = 0; i < _return_addresses.length(); i++) {
637 ciReturnAddress* entry = _return_addresses.at(i);
638 if (entry->bci() == bci) {
639 // We've found a match.
640 return entry;
641 }
642 }
643
644 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
645 init_ident_of(new_ret_addr);
646 _return_addresses.append(new_ret_addr);
647 return new_ret_addr;
648 }
649
650 // ------------------------------------------------------------------
651 // ciObjectFactory::init_ident_of
652 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
653 obj->set_ident(_next_ident++);
654 }
655
656 static ciObjectFactory::NonPermObject* emptyBucket = nullptr;
657
658 // ------------------------------------------------------------------
659 // ciObjectFactory::find_non_perm
660 //
661 // Use a small hash table, hashed on the klass of the key.
662 // If there is no entry in the cache corresponding to this oop, return
663 // the null tail of the bucket into which the oop should be inserted.
664 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(Handle keyHandle) {
665 assert(Universe::heap()->is_in(keyHandle()), "must be");
666 ciMetadata* klass = get_metadata(keyHandle->klass()); // This may safepoint!
667 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
668 for (NonPermObject* p; (p = (*bp)) != nullptr; bp = &p->next()) {
669 if (is_equal(p, keyHandle())) break;
670 }
671 return (*bp);
672 }
673
674
675
676 // ------------------------------------------------------------------
677 // Code for for NonPermObject
678 //
679 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
680 assert(ciObjectFactory::is_initialized(), "");
681 _object = object;
682 _next = bucket;
683 bucket = this;
684 }
685
686
687
688 // ------------------------------------------------------------------
689 // ciObjectFactory::insert_non_perm
690 //
691 // Insert a ciObject into the non-perm table.
692 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, Handle keyHandle, ciObject* obj) {
693 assert(Universe::heap()->is_in_or_null(keyHandle()), "must be");
694 assert(&where != &emptyBucket, "must not try to fill empty bucket");
695 NonPermObject* p = new (arena()) NonPermObject(where, keyHandle(), obj);
696 assert(where == p && is_equal(p, keyHandle()) && p->object() == obj, "entry must match");
697 assert(find_non_perm(keyHandle) == p, "must find the same spot");
698 ++_non_perm_count;
699 }
700
701 // ------------------------------------------------------------------
702 // ciObjectFactory::vm_symbol_at
703 // Get the ciSymbol corresponding to some index in vmSymbols.
704 ciSymbol* ciObjectFactory::vm_symbol_at(vmSymbolID sid) {
705 int index = vmSymbols::as_int(sid);
706 return _shared_ci_symbols[index];
707 }
708
709 // ------------------------------------------------------------------
710 // ciObjectFactory::metadata_do
711 void ciObjectFactory::metadata_do(MetadataClosure* f) {
712 for (int j = 0; j < _ci_metadata.length(); j++) {
713 Metadata* o = _ci_metadata.at(j)->constant_encoding();
714 f->do_metadata(o);
715 }
716 }
717
718 // ------------------------------------------------------------------
719 // ciObjectFactory::print_contents_impl
720 void ciObjectFactory::print_contents_impl() {
721 int len = _ci_metadata.length();
722 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
723 for (int i = 0; i < len; i++) {
724 _ci_metadata.at(i)->print();
725 tty->cr();
726 }
727 }
728
729 // ------------------------------------------------------------------
730 // ciObjectFactory::print_contents
731 void ciObjectFactory::print_contents() {
732 print();
733 tty->cr();
734 GUARDED_VM_ENTRY(print_contents_impl();)
735 }
736
737 // ------------------------------------------------------------------
738 // ciObjectFactory::print
739 //
740 // Print debugging information about the object factory
741 void ciObjectFactory::print() {
742 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
743 _non_perm_count, _ci_metadata.length(), _unloaded_methods.length(),
744 _unloaded_instances.length(),
745 _unloaded_klasses.length());
746 }