1 /*
2 * Copyright (c) 1999, 2026, 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/instanceKlass.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 _cached_init_state(arena, _shared_ident_limit, 0, (u1)0),
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 // ciInstanceKlass for well-known class is shared by all
103 // compiler threads and can be updated concurrently by
104 // other compiler threads during compilation.
105 // Make local copy of class state to avoid state change
106 // during compilation.
107 int len = _ci_metadata.length();
108 for (int i = 0; i < len; i++) {
109 ciMetadata* obj = _ci_metadata.at(i);
110 if (obj->is_loaded() && obj->is_instance_klass()) {
111 ciInstanceKlass* cik = obj->as_instance_klass();
112 precond(cik->is_shared());
113 InstanceKlass::ClassState current_state = cik->_init_state;
114 InstanceKlass::ClassState state = InstanceKlass::fully_initialized;
115 if (current_state != state) {
116 GUARDED_VM_ENTRY( state = cik->get_instanceKlass()->init_state(); )
117 // Update state of shared ciInstanceKlass
118 cik->_init_state = state;
119 }
120 // Cache state for current compilation
121 _cached_init_state.at_put_grow(cik->ident(), (u1)state, 0);
122 }
123 }
124 }
125 }
126
127 // ------------------------------------------------------------------
128 // ciObjectFactory::ciObjectFactory
129 void ciObjectFactory::initialize() {
130 ASSERT_IN_VM;
131 JavaThread* thread = JavaThread::current();
132 HandleMark handle_mark(thread);
133
134 // This Arena is long lived and exists in the resource mark of the
135 // compiler thread that initializes the initial ciObjectFactory which
136 // creates the shared ciObjects that all later ciObjectFactories use.
137 Arena* arena = new (mtCompiler) Arena(mtCompiler);
138 ciEnv initial(arena);
139 ciEnv* env = ciEnv::current();
140 env->_factory->init_shared_objects();
141
142 _initialized = true;
143
144 }
145
146 void ciObjectFactory::init_shared_objects() {
147
148 _next_ident = 1; // start numbering CI objects at 1
149
150 {
151 // Create the shared symbols, but not in _shared_ci_metadata.
152 for (auto index : EnumRange<vmSymbolID>{}) {
153 Symbol* vmsym = vmSymbols::symbol_at(index);
154 assert(vmSymbols::find_sid(vmsym) == index, "1-1 mapping");
155 ciSymbol* sym = new (_arena) ciSymbol(vmsym, index);
156 init_ident_of(sym);
157 _shared_ci_symbols[vmSymbols::as_int(index)] = sym;
158 }
159 #ifdef ASSERT
160 for (auto index : EnumRange<vmSymbolID>{}) {
161 Symbol* vmsym = vmSymbols::symbol_at(index);
162 ciSymbol* sym = vm_symbol_at(index);
163 assert(sym->get_symbol() == vmsym, "oop must match");
164 }
165 assert(ciSymbols::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
166 #endif
167 }
168
169 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
170 BasicType t = (BasicType)i;
171 if (type2name(t) != nullptr && !is_reference_type(t) &&
172 t != T_NARROWOOP && t != T_NARROWKLASS) {
173 ciType::_basic_types[t] = new (_arena) ciType(t);
174 init_ident_of(ciType::_basic_types[t]);
175 }
176 }
177
178 ciEnv::_null_object_instance = new (_arena) ciNullObject();
179 init_ident_of(ciEnv::_null_object_instance);
180
181 #define VM_CLASS_DEFN(name, ignore_s) \
182 if (vmClasses::name##_is_loaded()) \
183 ciEnv::_##name = get_metadata(vmClasses::name())->as_instance_klass();
184
185 VM_CLASSES_DO(VM_CLASS_DEFN)
186 #undef VM_CLASS_DEFN
187
188 for (int len = -1; len != _ci_metadata.length(); ) {
189 len = _ci_metadata.length();
190 for (int i2 = 0; i2 < len; i2++) {
191 ciMetadata* obj = _ci_metadata.at(i2);
192 assert (obj->is_metadata(), "what else would it be?");
193 if (obj->is_loaded() && obj->is_instance_klass()) {
194 obj->as_instance_klass()->compute_nonstatic_fields();
195 obj->as_instance_klass()->transitive_interfaces();
196 }
197 }
198 }
199
200 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol());
201 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents
202 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, nullptr);
203 init_ident_of(ciEnv::_unloaded_ciinstance_klass);
204 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
205 init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
206 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
207
208 get_metadata(Universe::boolArrayKlass());
209 get_metadata(Universe::charArrayKlass());
210 get_metadata(Universe::floatArrayKlass());
211 get_metadata(Universe::doubleArrayKlass());
212 get_metadata(Universe::byteArrayKlass());
213 get_metadata(Universe::shortArrayKlass());
214 get_metadata(Universe::intArrayKlass());
215 get_metadata(Universe::longArrayKlass());
216
217 assert(_non_perm_count == 0, "no shared non-perm objects");
218
219 // The shared_ident_limit is the first ident number that will
220 // be used for non-shared objects. That is, numbers less than
221 // this limit are permanently assigned to shared CI objects,
222 // while the higher numbers are recycled afresh by each new ciEnv.
223
224 _shared_ident_limit = _next_ident;
225 _shared_ci_metadata = &_ci_metadata;
226 }
227
228
229 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) {
230 vmSymbolID sid = vmSymbols::find_sid(key);
231 if (sid != vmSymbolID::NO_SID) {
232 // do not pollute the main cache with it
233 return vm_symbol_at(sid);
234 }
235
236 assert(vmSymbols::find_sid(key) == vmSymbolID::NO_SID, "");
237 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbolID::NO_SID);
238 _symbols.push(s);
239 return s;
240 }
241
242 // Decrement the refcount when done on symbols referenced by this compilation.
243 void ciObjectFactory::remove_symbols() {
244 for (int i = 0; i < _symbols.length(); i++) {
245 ciSymbol* s = _symbols.at(i);
246 s->get_symbol()->decrement_refcount();
247 }
248 // Since _symbols is resource allocated we're not allowed to delete it
249 // but it'll go away just the same.
250 }
251
252 // ------------------------------------------------------------------
253 // ciObjectFactory::get
254 //
255 // Get the ciObject corresponding to some oop. If the ciObject has
256 // already been created, it is returned. Otherwise, a new ciObject
257 // is created.
258 ciObject* ciObjectFactory::get(oop key) {
259 ASSERT_IN_VM;
260
261 Handle keyHandle(Thread::current(), key);
262 assert(Universe::heap()->is_in(keyHandle()), "must be");
263
264 NonPermObject* &bucket = find_non_perm(keyHandle);
265 if (bucket != nullptr) {
266 return bucket->object();
267 }
268
269 // The ciObject does not yet exist. Create it and insert it
270 // into the cache.
271 ciObject* new_object = create_new_object(keyHandle());
272 assert(keyHandle() == new_object->get_oop(), "must be properly recorded");
273 init_ident_of(new_object);
274 assert(Universe::heap()->is_in(new_object->get_oop()), "must be");
275
276 // Not a perm-space object.
277 insert_non_perm(bucket, keyHandle, new_object);
278 notice_new_object(new_object);
279 return new_object;
280 }
281
282 void ciObjectFactory::notice_new_object(ciBaseObject* new_object) {
283 if (TrainingData::need_data()) {
284 ciEnv* env = ciEnv::current();
285 if (env->task() != nullptr) {
286 // Note: task will be null during init_compiler_runtime.
287 CompileTrainingData* td = env->task()->training_data();
288 if (td != nullptr) {
289 td->notice_jit_observation(env, new_object);
290 }
291 }
292 }
293 }
294
295 int ciObjectFactory::metadata_compare(Metadata* const& key, ciMetadata* const& elt) {
296 Metadata* value = elt->constant_encoding();
297 if (key < value) return -1;
298 else if (key > value) return 1;
299 else return 0;
300 }
301
302 // ------------------------------------------------------------------
303 // ciObjectFactory::cached_metadata
304 //
305 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
306 // already been created, it is returned. Otherwise, null is returned.
307 ciMetadata* ciObjectFactory::cached_metadata(Metadata* key) {
308 ASSERT_IN_VM;
309
310 bool found = false;
311 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
312
313 if (!found) {
314 return nullptr;
315 }
316 return _ci_metadata.at(index)->as_metadata();
317 }
318
319
320 // ------------------------------------------------------------------
321 // ciObjectFactory::get_metadata
322 //
323 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
324 // already been created, it is returned. Otherwise, a new ciMetadata
325 // is created.
326 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
327 ASSERT_IN_VM;
328
329 if (ReplayCompiles && key->is_klass()) {
330 Klass* k = (Klass*)key;
331 if (k->is_instance_klass() && ciReplay::is_klass_unresolved((InstanceKlass*)k)) {
332 // Klass was unresolved at replay dump time. Simulate this case.
333 return ciEnv::_unloaded_ciinstance_klass;
334 }
335 }
336
337 #ifdef ASSERT
338 if (CIObjectFactoryVerify) {
339 Metadata* last = nullptr;
340 for (int j = 0; j < _ci_metadata.length(); j++) {
341 Metadata* o = _ci_metadata.at(j)->constant_encoding();
342 assert(last < o, "out of order");
343 last = o;
344 }
345 }
346 #endif // ASSERT
347 int len = _ci_metadata.length();
348 bool found = false;
349 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
350 #ifdef ASSERT
351 if (CIObjectFactoryVerify) {
352 for (int i = 0; i < _ci_metadata.length(); i++) {
353 if (_ci_metadata.at(i)->constant_encoding() == key) {
354 assert(index == i, " bad lookup");
355 }
356 }
357 }
358 #endif
359
360 if (!found) {
361 // The ciMetadata does not yet exist. Create it and insert it
362 // into the cache.
363 ciMetadata* new_object = create_new_metadata(key);
364 init_ident_of(new_object);
365 assert(new_object->is_metadata(), "must be");
366
367 if (len != _ci_metadata.length()) {
368 // creating the new object has recursively entered new objects
369 // into the table. We need to recompute our index.
370 index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
371 }
372 assert(!found, "no double insert");
373 _ci_metadata.insert_before(index, new_object);
374 notice_new_object(new_object);
375 return new_object;
376 }
377 return _ci_metadata.at(index)->as_metadata();
378 }
379
380 // ------------------------------------------------------------------
381 // ciObjectFactory::create_new_object
382 //
383 // Create a new ciObject from an oop.
384 //
385 // Implementation note: this functionality could be virtual behavior
386 // of the oop itself. For now, we explicitly marshal the object.
387 ciObject* ciObjectFactory::create_new_object(oop o) {
388 EXCEPTION_CONTEXT;
389
390 if (o->is_instance()) {
391 instanceHandle h_i(THREAD, (instanceOop)o);
392 if (java_lang_invoke_CallSite::is_instance(o))
393 return new (arena()) ciCallSite(h_i);
394 else if (java_lang_invoke_MemberName::is_instance(o))
395 return new (arena()) ciMemberName(h_i);
396 else if (java_lang_invoke_MethodHandle::is_instance(o))
397 return new (arena()) ciMethodHandle(h_i);
398 else if (java_lang_invoke_MethodType::is_instance(o))
399 return new (arena()) ciMethodType(h_i);
400 else
401 return new (arena()) ciInstance(h_i);
402 } else if (o->is_objArray()) {
403 objArrayHandle h_oa(THREAD, (objArrayOop)o);
404 return new (arena()) ciObjArray(h_oa);
405 } else if (o->is_typeArray()) {
406 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
407 return new (arena()) ciTypeArray(h_ta);
408 }
409
410 // The oop is of some type not supported by the compiler interface.
411 ShouldNotReachHere();
412 return nullptr;
413 }
414
415 // ------------------------------------------------------------------
416 // ciObjectFactory::create_new_metadata
417 //
418 // Create a new ciMetadata from a Metadata*.
419 //
420 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
421 // is used, which points to it's holder.
422 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
423 EXCEPTION_CONTEXT;
424
425 if (o->is_klass()) {
426 Klass* k = (Klass*)o;
427 if (k->is_instance_klass()) {
428 assert(!ReplayCompiles || ciReplay::no_replay_state() || !ciReplay::is_klass_unresolved((InstanceKlass*)k), "must be whitelisted for replay compilation");
429 return new (arena()) ciInstanceKlass(k);
430 } else if (k->is_objArray_klass()) {
431 return new (arena()) ciObjArrayKlass(k);
432 } else if (k->is_typeArray_klass()) {
433 return new (arena()) ciTypeArrayKlass(k);
434 }
435 } else if (o->is_method()) {
436 methodHandle h_m(THREAD, (Method*)o);
437 ciEnv *env = CURRENT_THREAD_ENV;
438 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
439 return new (arena()) ciMethod(h_m, holder);
440 } else if (o->is_methodData()) {
441 // Hold methodHandle alive - might not be necessary ???
442 methodHandle h_m(THREAD, ((MethodData*)o)->method());
443 return new (arena()) ciMethodData((MethodData*)o);
444 }
445
446 // The Metadata* is of some type not supported by the compiler interface.
447 ShouldNotReachHere();
448 return nullptr;
449 }
450
451 //------------------------------------------------------------------
452 // ciObjectFactory::get_unloaded_method
453 //
454 // Get the ciMethod representing an unloaded/unfound method.
455 //
456 // Implementation note: unloaded methods are currently stored in
457 // an unordered array, requiring a linear-time lookup for each
458 // unloaded method. This may need to change.
459 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
460 ciSymbol* name,
461 ciSymbol* signature,
462 ciInstanceKlass* accessor) {
463 assert(accessor != nullptr, "need origin of access");
464 ciSignature* that = nullptr;
465 for (int i = 0; i < _unloaded_methods.length(); i++) {
466 ciMethod* entry = _unloaded_methods.at(i);
467 if (entry->holder()->equals(holder) &&
468 entry->name()->equals(name) &&
469 entry->signature()->as_symbol()->equals(signature)) {
470 // Short-circuit slow resolve.
471 if (entry->signature()->accessing_klass() == accessor) {
472 // We've found a match.
473 return entry;
474 } else {
475 // Lazily create ciSignature
476 if (that == nullptr) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
477 if (entry->signature()->equals(that)) {
478 // We've found a match.
479 return entry;
480 }
481 }
482 }
483 }
484
485 // This is a new unloaded method. Create it and stick it in
486 // the cache.
487 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
488
489 init_ident_of(new_method);
490 _unloaded_methods.append(new_method);
491
492 return new_method;
493 }
494
495 //------------------------------------------------------------------
496 // ciObjectFactory::get_unloaded_klass
497 //
498 // Get a ciKlass representing an unloaded klass.
499 //
500 // Implementation note: unloaded klasses are currently stored in
501 // an unordered array, requiring a linear-time lookup for each
502 // unloaded klass. This may need to change.
503 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
504 ciSymbol* name,
505 bool create_if_not_found) {
506 EXCEPTION_CONTEXT;
507 oop loader = nullptr;
508 oop domain = nullptr;
509 if (accessing_klass != nullptr) {
510 loader = accessing_klass->loader();
511 }
512 for (int i = 0; i < _unloaded_klasses.length(); i++) {
513 ciKlass* entry = _unloaded_klasses.at(i);
514 if (entry->name()->equals(name) &&
515 entry->loader() == loader) {
516 // We've found a match.
517 return entry;
518 }
519 }
520
521 if (!create_if_not_found)
522 return nullptr;
523
524 // This is a new unloaded klass. Create it and stick it in
525 // the cache.
526 ciKlass* new_klass = nullptr;
527
528 // Two cases: this is an unloaded ObjArrayKlass or an
529 // unloaded InstanceKlass. Deal with both.
530 if (name->char_at(0) == JVM_SIGNATURE_ARRAY) {
531 // Decompose the name.'
532 SignatureStream ss(name->get_symbol(), false);
533 int dimension = ss.skip_array_prefix(); // skip all '['s
534 BasicType element_type = ss.type();
535 assert(element_type != T_ARRAY, "unsuccessful decomposition");
536 ciKlass* element_klass = nullptr;
537 if (element_type == T_OBJECT) {
538 ciEnv *env = CURRENT_THREAD_ENV;
539 ciSymbol* ci_name = env->get_symbol(ss.as_symbol());
540 element_klass =
541 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
542 } else {
543 assert(dimension > 1, "one dimensional type arrays are always loaded.");
544
545 // The type array itself takes care of one of the dimensions.
546 dimension--;
547
548 // The element klass is a TypeArrayKlass.
549 element_klass = ciTypeArrayKlass::make(element_type);
550 }
551 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
552 } else {
553 jobject loader_handle = nullptr;
554 if (accessing_klass != nullptr) {
555 loader_handle = accessing_klass->loader_handle();
556 }
557 new_klass = new (arena()) ciInstanceKlass(name, loader_handle);
558 }
559 init_ident_of(new_klass);
560 _unloaded_klasses.append(new_klass);
561
562 return new_klass;
563 }
564
565
566 //------------------------------------------------------------------
567 // ciObjectFactory::get_unloaded_instance
568 //
569 // Get a ciInstance representing an as-yet undetermined instance of a given class.
570 //
571 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
572 for (int i = 0; i < _unloaded_instances.length(); i++) {
573 ciInstance* entry = _unloaded_instances.at(i);
574 if (entry->klass()->equals(instance_klass)) {
575 // We've found a match.
576 return entry;
577 }
578 }
579
580 // This is a new unloaded instance. Create it and stick it in
581 // the cache.
582 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
583
584 init_ident_of(new_instance);
585 _unloaded_instances.append(new_instance);
586
587 // make sure it looks the way we want:
588 assert(!new_instance->is_loaded(), "");
589 assert(new_instance->klass() == instance_klass, "");
590
591 return new_instance;
592 }
593
594
595 //------------------------------------------------------------------
596 // ciObjectFactory::get_unloaded_klass_mirror
597 //
598 // Get a ciInstance representing an unresolved klass mirror.
599 //
600 // Currently, this ignores the parameters and returns a unique unloaded instance.
601 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
602 assert(ciEnv::_Class_klass != nullptr, "");
603 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
604 }
605
606 //------------------------------------------------------------------
607 // ciObjectFactory::get_unloaded_method_handle_constant
608 //
609 // Get a ciInstance representing an unresolved method handle constant.
610 //
611 // Currently, this ignores the parameters and returns a unique unloaded instance.
612 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
613 ciSymbol* name,
614 ciSymbol* signature,
615 int ref_kind) {
616 assert(ciEnv::_MethodHandle_klass != nullptr, "");
617 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
618 }
619
620 //------------------------------------------------------------------
621 // ciObjectFactory::get_unloaded_method_type_constant
622 //
623 // Get a ciInstance representing an unresolved method type constant.
624 //
625 // Currently, this ignores the parameters and returns a unique unloaded instance.
626 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
627 assert(ciEnv::_MethodType_klass != nullptr, "");
628 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
629 }
630
631 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
632 assert(ciEnv::_Object_klass != nullptr, "");
633 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
634 }
635
636 //------------------------------------------------------------------
637 // ciObjectFactory::get_empty_methodData
638 //
639 // Get the ciMethodData representing the methodData for a method with
640 // none.
641 ciMethodData* ciObjectFactory::get_empty_methodData() {
642 ciMethodData* new_methodData = new (arena()) ciMethodData();
643 init_ident_of(new_methodData);
644 return new_methodData;
645 }
646
647 //------------------------------------------------------------------
648 // ciObjectFactory::get_return_address
649 //
650 // Get a ciReturnAddress for a specified bci.
651 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
652 for (int i = 0; i < _return_addresses.length(); i++) {
653 ciReturnAddress* entry = _return_addresses.at(i);
654 if (entry->bci() == bci) {
655 // We've found a match.
656 return entry;
657 }
658 }
659
660 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
661 init_ident_of(new_ret_addr);
662 _return_addresses.append(new_ret_addr);
663 return new_ret_addr;
664 }
665
666 // ------------------------------------------------------------------
667 // ciObjectFactory::init_ident_of
668 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
669 obj->set_ident(_next_ident++);
670 }
671
672 static ciObjectFactory::NonPermObject* emptyBucket = nullptr;
673
674 // ------------------------------------------------------------------
675 // ciObjectFactory::find_non_perm
676 //
677 // Use a small hash table, hashed on the klass of the key.
678 // If there is no entry in the cache corresponding to this oop, return
679 // the null tail of the bucket into which the oop should be inserted.
680 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(Handle keyHandle) {
681 assert(Universe::heap()->is_in(keyHandle()), "must be");
682 ciMetadata* klass = get_metadata(keyHandle->klass()); // This may safepoint!
683 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
684 for (NonPermObject* p; (p = (*bp)) != nullptr; bp = &p->next()) {
685 if (is_equal(p, keyHandle())) break;
686 }
687 return (*bp);
688 }
689
690
691
692 // ------------------------------------------------------------------
693 // Code for for NonPermObject
694 //
695 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
696 assert(ciObjectFactory::is_initialized(), "");
697 _object = object;
698 _next = bucket;
699 bucket = this;
700 }
701
702
703
704 // ------------------------------------------------------------------
705 // ciObjectFactory::insert_non_perm
706 //
707 // Insert a ciObject into the non-perm table.
708 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, Handle keyHandle, ciObject* obj) {
709 assert(Universe::heap()->is_in_or_null(keyHandle()), "must be");
710 assert(&where != &emptyBucket, "must not try to fill empty bucket");
711 NonPermObject* p = new (arena()) NonPermObject(where, keyHandle(), obj);
712 assert(where == p && is_equal(p, keyHandle()) && p->object() == obj, "entry must match");
713 assert(find_non_perm(keyHandle) == p, "must find the same spot");
714 ++_non_perm_count;
715 }
716
717 // ------------------------------------------------------------------
718 // ciObjectFactory::vm_symbol_at
719 // Get the ciSymbol corresponding to some index in vmSymbols.
720 ciSymbol* ciObjectFactory::vm_symbol_at(vmSymbolID sid) {
721 int index = vmSymbols::as_int(sid);
722 return _shared_ci_symbols[index];
723 }
724
725 // ------------------------------------------------------------------
726 // ciObjectFactory::metadata_do
727 void ciObjectFactory::metadata_do(MetadataClosure* f) {
728 for (int j = 0; j < _ci_metadata.length(); j++) {
729 Metadata* o = _ci_metadata.at(j)->constant_encoding();
730 f->do_metadata(o);
731 }
732 }
733
734 // ------------------------------------------------------------------
735 // ciObjectFactory::print_contents_impl
736 void ciObjectFactory::print_contents_impl() {
737 int len = _ci_metadata.length();
738 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
739 for (int i = 0; i < len; i++) {
740 _ci_metadata.at(i)->print();
741 tty->cr();
742 }
743 }
744
745 // ------------------------------------------------------------------
746 // ciObjectFactory::print_contents
747 void ciObjectFactory::print_contents() {
748 print();
749 tty->cr();
750 GUARDED_VM_ENTRY(print_contents_impl();)
751 }
752
753 // ------------------------------------------------------------------
754 // ciObjectFactory::print
755 //
756 // Print debugging information about the object factory
757 void ciObjectFactory::print() {
758 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
759 _non_perm_count, _ci_metadata.length(), _unloaded_methods.length(),
760 _unloaded_instances.length(),
761 _unloaded_klasses.length());
762 }