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/ciReplay.hpp"
42 #include "ci/ciSymbol.hpp"
43 #include "ci/ciSymbols.hpp"
44 #include "ci/ciTypeArray.hpp"
45 #include "ci/ciTypeArrayKlass.hpp"
46 #include "ci/ciUtilities.inline.hpp"
47 #include "classfile/javaClasses.inline.hpp"
48 #include "classfile/vmClasses.hpp"
49 #include "compiler/compiler_globals.hpp"
50 #include "gc/shared/collectedHeap.inline.hpp"
51 #include "memory/allocation.inline.hpp"
52 #include "memory/universe.hpp"
53 #include "oops/oop.inline.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, Arena::Tag::tag_cienv);
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);
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 return new_object;
256 }
257
258 int ciObjectFactory::metadata_compare(Metadata* const& key, ciMetadata* const& elt) {
259 Metadata* value = elt->constant_encoding();
260 if (key < value) return -1;
261 else if (key > value) return 1;
262 else return 0;
263 }
264
265 // ------------------------------------------------------------------
266 // ciObjectFactory::cached_metadata
267 //
268 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
269 // already been created, it is returned. Otherwise, null is returned.
270 ciMetadata* ciObjectFactory::cached_metadata(Metadata* key) {
271 ASSERT_IN_VM;
272
273 bool found = false;
274 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
275
276 if (!found) {
277 return nullptr;
278 }
279 return _ci_metadata.at(index)->as_metadata();
280 }
281
282
283 // ------------------------------------------------------------------
284 // ciObjectFactory::get_metadata
285 //
286 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
287 // already been created, it is returned. Otherwise, a new ciMetadata
288 // is created.
289 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
290 ASSERT_IN_VM;
291
292 if (ReplayCompiles && key->is_klass()) {
293 Klass* k = (Klass*)key;
294 if (k->is_instance_klass() && ciReplay::is_klass_unresolved((InstanceKlass*)k)) {
295 // Klass was unresolved at replay dump time. Simulate this case.
296 return ciEnv::_unloaded_ciinstance_klass;
297 }
298 }
299
300 #ifdef ASSERT
301 if (CIObjectFactoryVerify) {
302 Metadata* last = nullptr;
303 for (int j = 0; j < _ci_metadata.length(); j++) {
304 Metadata* o = _ci_metadata.at(j)->constant_encoding();
305 assert(last < o, "out of order");
306 last = o;
307 }
308 }
309 #endif // ASSERT
310 int len = _ci_metadata.length();
311 bool found = false;
312 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
313 #ifdef ASSERT
314 if (CIObjectFactoryVerify) {
315 for (int i = 0; i < _ci_metadata.length(); i++) {
316 if (_ci_metadata.at(i)->constant_encoding() == key) {
317 assert(index == i, " bad lookup");
318 }
319 }
320 }
321 #endif
322
323 if (!found) {
324 // The ciMetadata does not yet exist. Create it and insert it
325 // into the cache.
326 ciMetadata* new_object = create_new_metadata(key);
327 init_ident_of(new_object);
328 assert(new_object->is_metadata(), "must be");
329
330 if (len != _ci_metadata.length()) {
331 // creating the new object has recursively entered new objects
332 // into the table. We need to recompute our index.
333 index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
334 }
335 assert(!found, "no double insert");
336 _ci_metadata.insert_before(index, new_object);
337 return new_object;
338 }
339 return _ci_metadata.at(index)->as_metadata();
340 }
341
342 // ------------------------------------------------------------------
343 // ciObjectFactory::create_new_object
344 //
345 // Create a new ciObject from an oop.
346 //
347 // Implementation note: this functionality could be virtual behavior
348 // of the oop itself. For now, we explicitly marshal the object.
349 ciObject* ciObjectFactory::create_new_object(oop o) {
350 EXCEPTION_CONTEXT;
351
352 if (o->is_instance()) {
353 instanceHandle h_i(THREAD, (instanceOop)o);
354 if (java_lang_invoke_CallSite::is_instance(o))
355 return new (arena()) ciCallSite(h_i);
356 else if (java_lang_invoke_MemberName::is_instance(o))
357 return new (arena()) ciMemberName(h_i);
358 else if (java_lang_invoke_MethodHandle::is_instance(o))
359 return new (arena()) ciMethodHandle(h_i);
360 else if (java_lang_invoke_MethodType::is_instance(o))
361 return new (arena()) ciMethodType(h_i);
362 else
363 return new (arena()) ciInstance(h_i);
364 } else if (o->is_objArray()) {
365 objArrayHandle h_oa(THREAD, (objArrayOop)o);
366 return new (arena()) ciObjArray(h_oa);
367 } else if (o->is_typeArray()) {
368 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
369 return new (arena()) ciTypeArray(h_ta);
370 } else if (o->is_flatArray()) {
371 flatArrayHandle h_ta(THREAD, (flatArrayOop)o);
372 return new (arena()) ciFlatArray(h_ta);
373 }
374
375 // The oop is of some type not supported by the compiler interface.
376 ShouldNotReachHere();
377 return nullptr;
378 }
379
380 // ------------------------------------------------------------------
381 // ciObjectFactory::create_new_metadata
382 //
383 // Create a new ciMetadata from a Metadata*.
384 //
385 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
386 // is used, which points to it's holder.
387 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
388 EXCEPTION_CONTEXT;
389
390 if (o->is_klass()) {
391 Klass* k = (Klass*)o;
392 if (k->is_inline_klass()) {
393 return new (arena()) ciInlineKlass(k);
394 } else if (k->is_instance_klass()) {
395 assert(!ReplayCompiles || ciReplay::no_replay_state() || !ciReplay::is_klass_unresolved((InstanceKlass*)k), "must be whitelisted for replay compilation");
396 return new (arena()) ciInstanceKlass(k);
397 } else if (k->is_flatArray_klass()) {
398 return new (arena()) ciFlatArrayKlass(k);
399 } else if (k->is_objArray_klass()) {
400 return new (arena()) ciObjArrayKlass(k);
401 } else if (k->is_typeArray_klass()) {
402 return new (arena()) ciTypeArrayKlass(k);
403 }
404 } else if (o->is_method()) {
405 methodHandle h_m(THREAD, (Method*)o);
406 ciEnv *env = CURRENT_THREAD_ENV;
407 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
408 return new (arena()) ciMethod(h_m, holder);
409 } else if (o->is_methodData()) {
410 // Hold methodHandle alive - might not be necessary ???
411 methodHandle h_m(THREAD, ((MethodData*)o)->method());
412 return new (arena()) ciMethodData((MethodData*)o);
413 }
414
415 // The Metadata* is of some type not supported by the compiler interface.
416 ShouldNotReachHere();
417 return nullptr;
418 }
419
420 //------------------------------------------------------------------
421 // ciObjectFactory::get_unloaded_method
422 //
423 // Get the ciMethod representing an unloaded/unfound method.
424 //
425 // Implementation note: unloaded methods are currently stored in
426 // an unordered array, requiring a linear-time lookup for each
427 // unloaded method. This may need to change.
428 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
429 ciSymbol* name,
430 ciSymbol* signature,
431 ciInstanceKlass* accessor) {
432 assert(accessor != nullptr, "need origin of access");
433 ciSignature* that = nullptr;
434 for (int i = 0; i < _unloaded_methods.length(); i++) {
435 ciMethod* entry = _unloaded_methods.at(i);
436 if (entry->holder()->equals(holder) &&
437 entry->name()->equals(name) &&
438 entry->signature()->as_symbol()->equals(signature)) {
439 // Short-circuit slow resolve.
440 if (entry->signature()->accessing_klass() == accessor) {
441 // We've found a match.
442 return entry;
443 } else {
444 // Lazily create ciSignature
445 if (that == nullptr) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
446 if (entry->signature()->equals(that)) {
447 // We've found a match.
448 return entry;
449 }
450 }
451 }
452 }
453
454 // This is a new unloaded method. Create it and stick it in
455 // the cache.
456 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
457
458 init_ident_of(new_method);
459 _unloaded_methods.append(new_method);
460
461 return new_method;
462 }
463
464 //------------------------------------------------------------------
465 // ciObjectFactory::get_unloaded_klass
466 //
467 // Get a ciKlass representing an unloaded klass.
468 //
469 // Implementation note: unloaded klasses are currently stored in
470 // an unordered array, requiring a linear-time lookup for each
471 // unloaded klass. This may need to change.
472 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
473 ciSymbol* name,
474 bool create_if_not_found) {
475 EXCEPTION_CONTEXT;
476 oop loader = nullptr;
477 oop domain = nullptr;
478 if (accessing_klass != nullptr) {
479 loader = accessing_klass->loader();
480 }
481 for (int i = 0; i < _unloaded_klasses.length(); i++) {
482 ciKlass* entry = _unloaded_klasses.at(i);
483 if (entry->name()->equals(name) &&
484 entry->loader() == loader) {
485 // We've found a match.
486 return entry;
487 }
488 }
489
490 if (!create_if_not_found)
491 return nullptr;
492
493 // This is a new unloaded klass. Create it and stick it in
494 // the cache.
495 ciKlass* new_klass = nullptr;
496
497 // Two cases: this is an unloaded ObjArrayKlass or an
498 // unloaded InstanceKlass. Deal with both.
499 if (name->char_at(0) == JVM_SIGNATURE_ARRAY) {
500 // Decompose the name.'
501 SignatureStream ss(name->get_symbol(), false);
502 int dimension = ss.skip_array_prefix(); // skip all '['s
503 BasicType element_type = ss.type();
504 assert(element_type != T_ARRAY, "unsuccessful decomposition");
505 ciKlass* element_klass = nullptr;
506 if (element_type == T_OBJECT) {
507 ciEnv *env = CURRENT_THREAD_ENV;
508 ciSymbol* ci_name = env->get_symbol(ss.as_symbol());
509 element_klass =
510 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
511 } else {
512 assert(dimension > 1, "one dimensional type arrays are always loaded.");
513
514 // The type array itself takes care of one of the dimensions.
515 dimension--;
516
517 // The element klass is a TypeArrayKlass.
518 element_klass = ciTypeArrayKlass::make(element_type);
519 }
520 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
521 } else {
522 jobject loader_handle = nullptr;
523 if (accessing_klass != nullptr) {
524 loader_handle = accessing_klass->loader_handle();
525 }
526 new_klass = new (arena()) ciInstanceKlass(name, loader_handle);
527 }
528 init_ident_of(new_klass);
529 _unloaded_klasses.append(new_klass);
530
531 return new_klass;
532 }
533
534
535 //------------------------------------------------------------------
536 // ciObjectFactory::get_unloaded_instance
537 //
538 // Get a ciInstance representing an as-yet undetermined instance of a given class.
539 //
540 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
541 for (int i = 0; i < _unloaded_instances.length(); i++) {
542 ciInstance* entry = _unloaded_instances.at(i);
543 if (entry->klass()->equals(instance_klass)) {
544 // We've found a match.
545 return entry;
546 }
547 }
548
549 // This is a new unloaded instance. Create it and stick it in
550 // the cache.
551 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
552
553 init_ident_of(new_instance);
554 _unloaded_instances.append(new_instance);
555
556 // make sure it looks the way we want:
557 assert(!new_instance->is_loaded(), "");
558 assert(new_instance->klass() == instance_klass, "");
559
560 return new_instance;
561 }
562
563
564 //------------------------------------------------------------------
565 // ciObjectFactory::get_unloaded_klass_mirror
566 //
567 // Get a ciInstance representing an unresolved klass mirror.
568 //
569 // Currently, this ignores the parameters and returns a unique unloaded instance.
570 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
571 assert(ciEnv::_Class_klass != nullptr, "");
572 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
573 }
574
575 //------------------------------------------------------------------
576 // ciObjectFactory::get_unloaded_method_handle_constant
577 //
578 // Get a ciInstance representing an unresolved method handle constant.
579 //
580 // Currently, this ignores the parameters and returns a unique unloaded instance.
581 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
582 ciSymbol* name,
583 ciSymbol* signature,
584 int ref_kind) {
585 assert(ciEnv::_MethodHandle_klass != nullptr, "");
586 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
587 }
588
589 //------------------------------------------------------------------
590 // ciObjectFactory::get_unloaded_method_type_constant
591 //
592 // Get a ciInstance representing an unresolved method type constant.
593 //
594 // Currently, this ignores the parameters and returns a unique unloaded instance.
595 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
596 assert(ciEnv::_MethodType_klass != nullptr, "");
597 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
598 }
599
600 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
601 assert(ciEnv::_Object_klass != nullptr, "");
602 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
603 }
604
605 //------------------------------------------------------------------
606 // ciObjectFactory::get_empty_methodData
607 //
608 // Get the ciMethodData representing the methodData for a method with
609 // none.
610 ciMethodData* ciObjectFactory::get_empty_methodData() {
611 ciMethodData* new_methodData = new (arena()) ciMethodData();
612 init_ident_of(new_methodData);
613 return new_methodData;
614 }
615
616 //------------------------------------------------------------------
617 // ciObjectFactory::get_return_address
618 //
619 // Get a ciReturnAddress for a specified bci.
620 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
621 for (int i = 0; i < _return_addresses.length(); i++) {
622 ciReturnAddress* entry = _return_addresses.at(i);
623 if (entry->bci() == bci) {
624 // We've found a match.
625 return entry;
626 }
627 }
628
629 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
630 init_ident_of(new_ret_addr);
631 _return_addresses.append(new_ret_addr);
632 return new_ret_addr;
633 }
634
635 ciWrapper* ciObjectFactory::make_null_free_wrapper(ciType* type) {
636 ciWrapper* wrapper = new (arena()) ciWrapper(type);
637 init_ident_of(wrapper);
638 return wrapper;
639 }
640
641 // ------------------------------------------------------------------
642 // ciObjectFactory::init_ident_of
643 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
644 obj->set_ident(_next_ident++);
645 }
646
647 static ciObjectFactory::NonPermObject* emptyBucket = nullptr;
648
649 // ------------------------------------------------------------------
650 // ciObjectFactory::find_non_perm
651 //
652 // Use a small hash table, hashed on the klass of the key.
653 // If there is no entry in the cache corresponding to this oop, return
654 // the null tail of the bucket into which the oop should be inserted.
655 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
656 assert(Universe::heap()->is_in(key), "must be");
657 ciMetadata* klass = get_metadata(key->klass());
658 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
659 for (NonPermObject* p; (p = (*bp)) != nullptr; bp = &p->next()) {
660 if (is_equal(p, key)) break;
661 }
662 return (*bp);
663 }
664
665
666
667 // ------------------------------------------------------------------
668 // Code for for NonPermObject
669 //
670 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
671 assert(ciObjectFactory::is_initialized(), "");
672 _object = object;
673 _next = bucket;
674 bucket = this;
675 }
676
677
678
679 // ------------------------------------------------------------------
680 // ciObjectFactory::insert_non_perm
681 //
682 // Insert a ciObject into the non-perm table.
683 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
684 assert(Universe::heap()->is_in_or_null(key), "must be");
685 assert(&where != &emptyBucket, "must not try to fill empty bucket");
686 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
687 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
688 assert(find_non_perm(key) == p, "must find the same spot");
689 ++_non_perm_count;
690 }
691
692 // ------------------------------------------------------------------
693 // ciObjectFactory::vm_symbol_at
694 // Get the ciSymbol corresponding to some index in vmSymbols.
695 ciSymbol* ciObjectFactory::vm_symbol_at(vmSymbolID sid) {
696 int index = vmSymbols::as_int(sid);
697 return _shared_ci_symbols[index];
698 }
699
700 // ------------------------------------------------------------------
701 // ciObjectFactory::metadata_do
702 void ciObjectFactory::metadata_do(MetadataClosure* f) {
703 for (int j = 0; j < _ci_metadata.length(); j++) {
704 Metadata* o = _ci_metadata.at(j)->constant_encoding();
705 f->do_metadata(o);
706 }
707 }
708
709 // ------------------------------------------------------------------
710 // ciObjectFactory::print_contents_impl
711 void ciObjectFactory::print_contents_impl() {
712 int len = _ci_metadata.length();
713 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
714 for (int i = 0; i < len; i++) {
715 _ci_metadata.at(i)->print();
716 tty->cr();
717 }
718 }
719
720 // ------------------------------------------------------------------
721 // ciObjectFactory::print_contents
722 void ciObjectFactory::print_contents() {
723 print();
724 tty->cr();
725 GUARDED_VM_ENTRY(print_contents_impl();)
726 }
727
728 // ------------------------------------------------------------------
729 // ciObjectFactory::print
730 //
731 // Print debugging information about the object factory
732 void ciObjectFactory::print() {
733 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
734 _non_perm_count, _ci_metadata.length(), _unloaded_methods.length(),
735 _unloaded_instances.length(),
736 _unloaded_klasses.length());
737 }