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/compileTask.hpp"
47 #include "compiler/compiler_globals.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 return bucket->object();
243 }
244
245 // The ciObject does not yet exist. Create it and insert it
246 // into the cache.
247 ciObject* new_object = create_new_object(keyHandle());
248 assert(keyHandle() == new_object->get_oop(), "must be properly recorded");
249 init_ident_of(new_object);
250 assert(Universe::heap()->is_in(new_object->get_oop()), "must be");
251
252 // Not a perm-space object.
253 insert_non_perm(bucket, keyHandle, new_object);
254 notice_new_object(new_object);
255 return new_object;
256 }
257
258 void ciObjectFactory::notice_new_object(ciBaseObject* new_object) {
259 if (TrainingData::need_data()) {
260 ciEnv* env = ciEnv::current();
261 if (env->task() != nullptr) {
262 // Note: task will be null during init_compiler_runtime.
263 CompileTrainingData* td = env->task()->training_data();
264 if (td != nullptr) {
265 td->notice_jit_observation(env, new_object);
266 }
267 }
268 }
269 }
270
271 int ciObjectFactory::metadata_compare(Metadata* const& key, ciMetadata* const& elt) {
272 Metadata* value = elt->constant_encoding();
273 if (key < value) return -1;
274 else if (key > value) return 1;
275 else return 0;
276 }
277
278 // ------------------------------------------------------------------
279 // ciObjectFactory::cached_metadata
280 //
281 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
282 // already been created, it is returned. Otherwise, null is returned.
283 ciMetadata* ciObjectFactory::cached_metadata(Metadata* key) {
284 ASSERT_IN_VM;
285
286 bool found = false;
287 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
288
289 if (!found) {
290 return nullptr;
291 }
292 return _ci_metadata.at(index)->as_metadata();
293 }
294
295
296 // ------------------------------------------------------------------
297 // ciObjectFactory::get_metadata
298 //
299 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
300 // already been created, it is returned. Otherwise, a new ciMetadata
301 // is created.
302 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
303 ASSERT_IN_VM;
304
305 if (ReplayCompiles && key->is_klass()) {
306 Klass* k = (Klass*)key;
307 if (k->is_instance_klass() && ciReplay::is_klass_unresolved((InstanceKlass*)k)) {
308 // Klass was unresolved at replay dump time. Simulate this case.
309 return ciEnv::_unloaded_ciinstance_klass;
310 }
311 }
312
313 #ifdef ASSERT
314 if (CIObjectFactoryVerify) {
315 Metadata* last = nullptr;
316 for (int j = 0; j < _ci_metadata.length(); j++) {
317 Metadata* o = _ci_metadata.at(j)->constant_encoding();
318 assert(last < o, "out of order");
319 last = o;
320 }
321 }
322 #endif // ASSERT
323 int len = _ci_metadata.length();
324 bool found = false;
325 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
326 #ifdef ASSERT
327 if (CIObjectFactoryVerify) {
328 for (int i = 0; i < _ci_metadata.length(); i++) {
329 if (_ci_metadata.at(i)->constant_encoding() == key) {
330 assert(index == i, " bad lookup");
331 }
332 }
333 }
334 #endif
335
336 if (!found) {
337 // The ciMetadata does not yet exist. Create it and insert it
338 // into the cache.
339 ciMetadata* new_object = create_new_metadata(key);
340 init_ident_of(new_object);
341 assert(new_object->is_metadata(), "must be");
342
343 if (len != _ci_metadata.length()) {
344 // creating the new object has recursively entered new objects
345 // into the table. We need to recompute our index.
346 index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
347 }
348 assert(!found, "no double insert");
349 _ci_metadata.insert_before(index, new_object);
350 notice_new_object(new_object);
351 return new_object;
352 }
353 return _ci_metadata.at(index)->as_metadata();
354 }
355
356 // ------------------------------------------------------------------
357 // ciObjectFactory::create_new_object
358 //
359 // Create a new ciObject from an oop.
360 //
361 // Implementation note: this functionality could be virtual behavior
362 // of the oop itself. For now, we explicitly marshal the object.
363 ciObject* ciObjectFactory::create_new_object(oop o) {
364 EXCEPTION_CONTEXT;
365
366 if (o->is_instance()) {
367 instanceHandle h_i(THREAD, (instanceOop)o);
368 if (java_lang_invoke_CallSite::is_instance(o))
369 return new (arena()) ciCallSite(h_i);
370 else if (java_lang_invoke_MemberName::is_instance(o))
371 return new (arena()) ciMemberName(h_i);
372 else if (java_lang_invoke_MethodHandle::is_instance(o))
373 return new (arena()) ciMethodHandle(h_i);
374 else if (java_lang_invoke_MethodType::is_instance(o))
375 return new (arena()) ciMethodType(h_i);
376 else
377 return new (arena()) ciInstance(h_i);
378 } else if (o->is_objArray()) {
379 objArrayHandle h_oa(THREAD, (objArrayOop)o);
380 return new (arena()) ciObjArray(h_oa);
381 } else if (o->is_typeArray()) {
382 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
383 return new (arena()) ciTypeArray(h_ta);
384 }
385
386 // The oop is of some type not supported by the compiler interface.
387 ShouldNotReachHere();
388 return nullptr;
389 }
390
391 // ------------------------------------------------------------------
392 // ciObjectFactory::create_new_metadata
393 //
394 // Create a new ciMetadata from a Metadata*.
395 //
396 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
397 // is used, which points to it's holder.
398 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
399 EXCEPTION_CONTEXT;
400
401 if (o->is_klass()) {
402 Klass* k = (Klass*)o;
403 if (k->is_instance_klass()) {
404 assert(!ReplayCompiles || ciReplay::no_replay_state() || !ciReplay::is_klass_unresolved((InstanceKlass*)k), "must be whitelisted for replay compilation");
405 return new (arena()) ciInstanceKlass(k);
406 } else if (k->is_objArray_klass()) {
407 return new (arena()) ciObjArrayKlass(k);
408 } else if (k->is_typeArray_klass()) {
409 return new (arena()) ciTypeArrayKlass(k);
410 }
411 } else if (o->is_method()) {
412 methodHandle h_m(THREAD, (Method*)o);
413 ciEnv *env = CURRENT_THREAD_ENV;
414 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
415 return new (arena()) ciMethod(h_m, holder);
416 } else if (o->is_methodData()) {
417 // Hold methodHandle alive - might not be necessary ???
418 methodHandle h_m(THREAD, ((MethodData*)o)->method());
419 return new (arena()) ciMethodData((MethodData*)o);
420 }
421
422 // The Metadata* is of some type not supported by the compiler interface.
423 ShouldNotReachHere();
424 return nullptr;
425 }
426
427 //------------------------------------------------------------------
428 // ciObjectFactory::get_unloaded_method
429 //
430 // Get the ciMethod representing an unloaded/unfound method.
431 //
432 // Implementation note: unloaded methods are currently stored in
433 // an unordered array, requiring a linear-time lookup for each
434 // unloaded method. This may need to change.
435 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
436 ciSymbol* name,
437 ciSymbol* signature,
438 ciInstanceKlass* accessor) {
439 assert(accessor != nullptr, "need origin of access");
440 ciSignature* that = nullptr;
441 for (int i = 0; i < _unloaded_methods.length(); i++) {
442 ciMethod* entry = _unloaded_methods.at(i);
443 if (entry->holder()->equals(holder) &&
444 entry->name()->equals(name) &&
445 entry->signature()->as_symbol()->equals(signature)) {
446 // Short-circuit slow resolve.
447 if (entry->signature()->accessing_klass() == accessor) {
448 // We've found a match.
449 return entry;
450 } else {
451 // Lazily create ciSignature
452 if (that == nullptr) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
453 if (entry->signature()->equals(that)) {
454 // We've found a match.
455 return entry;
456 }
457 }
458 }
459 }
460
461 // This is a new unloaded method. Create it and stick it in
462 // the cache.
463 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
464
465 init_ident_of(new_method);
466 _unloaded_methods.append(new_method);
467
468 return new_method;
469 }
470
471 //------------------------------------------------------------------
472 // ciObjectFactory::get_unloaded_klass
473 //
474 // Get a ciKlass representing an unloaded klass.
475 //
476 // Implementation note: unloaded klasses are currently stored in
477 // an unordered array, requiring a linear-time lookup for each
478 // unloaded klass. This may need to change.
479 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
480 ciSymbol* name,
481 bool create_if_not_found) {
482 EXCEPTION_CONTEXT;
483 oop loader = nullptr;
484 oop domain = nullptr;
485 if (accessing_klass != nullptr) {
486 loader = accessing_klass->loader();
487 }
488 for (int i = 0; i < _unloaded_klasses.length(); i++) {
489 ciKlass* entry = _unloaded_klasses.at(i);
490 if (entry->name()->equals(name) &&
491 entry->loader() == loader) {
492 // We've found a match.
493 return entry;
494 }
495 }
496
497 if (!create_if_not_found)
498 return nullptr;
499
500 // This is a new unloaded klass. Create it and stick it in
501 // the cache.
502 ciKlass* new_klass = nullptr;
503
504 // Two cases: this is an unloaded ObjArrayKlass or an
505 // unloaded InstanceKlass. Deal with both.
506 if (name->char_at(0) == JVM_SIGNATURE_ARRAY) {
507 // Decompose the name.'
508 SignatureStream ss(name->get_symbol(), false);
509 int dimension = ss.skip_array_prefix(); // skip all '['s
510 BasicType element_type = ss.type();
511 assert(element_type != T_ARRAY, "unsuccessful decomposition");
512 ciKlass* element_klass = nullptr;
513 if (element_type == T_OBJECT) {
514 ciEnv *env = CURRENT_THREAD_ENV;
515 ciSymbol* ci_name = env->get_symbol(ss.as_symbol());
516 element_klass =
517 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
518 } else {
519 assert(dimension > 1, "one dimensional type arrays are always loaded.");
520
521 // The type array itself takes care of one of the dimensions.
522 dimension--;
523
524 // The element klass is a TypeArrayKlass.
525 element_klass = ciTypeArrayKlass::make(element_type);
526 }
527 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
528 } else {
529 jobject loader_handle = nullptr;
530 if (accessing_klass != nullptr) {
531 loader_handle = accessing_klass->loader_handle();
532 }
533 new_klass = new (arena()) ciInstanceKlass(name, loader_handle);
534 }
535 init_ident_of(new_klass);
536 _unloaded_klasses.append(new_klass);
537
538 return new_klass;
539 }
540
541
542 //------------------------------------------------------------------
543 // ciObjectFactory::get_unloaded_instance
544 //
545 // Get a ciInstance representing an as-yet undetermined instance of a given class.
546 //
547 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
548 for (int i = 0; i < _unloaded_instances.length(); i++) {
549 ciInstance* entry = _unloaded_instances.at(i);
550 if (entry->klass()->equals(instance_klass)) {
551 // We've found a match.
552 return entry;
553 }
554 }
555
556 // This is a new unloaded instance. Create it and stick it in
557 // the cache.
558 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
559
560 init_ident_of(new_instance);
561 _unloaded_instances.append(new_instance);
562
563 // make sure it looks the way we want:
564 assert(!new_instance->is_loaded(), "");
565 assert(new_instance->klass() == instance_klass, "");
566
567 return new_instance;
568 }
569
570
571 //------------------------------------------------------------------
572 // ciObjectFactory::get_unloaded_klass_mirror
573 //
574 // Get a ciInstance representing an unresolved klass mirror.
575 //
576 // Currently, this ignores the parameters and returns a unique unloaded instance.
577 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
578 assert(ciEnv::_Class_klass != nullptr, "");
579 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
580 }
581
582 //------------------------------------------------------------------
583 // ciObjectFactory::get_unloaded_method_handle_constant
584 //
585 // Get a ciInstance representing an unresolved method handle constant.
586 //
587 // Currently, this ignores the parameters and returns a unique unloaded instance.
588 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
589 ciSymbol* name,
590 ciSymbol* signature,
591 int ref_kind) {
592 assert(ciEnv::_MethodHandle_klass != nullptr, "");
593 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
594 }
595
596 //------------------------------------------------------------------
597 // ciObjectFactory::get_unloaded_method_type_constant
598 //
599 // Get a ciInstance representing an unresolved method type constant.
600 //
601 // Currently, this ignores the parameters and returns a unique unloaded instance.
602 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
603 assert(ciEnv::_MethodType_klass != nullptr, "");
604 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
605 }
606
607 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
608 assert(ciEnv::_Object_klass != nullptr, "");
609 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
610 }
611
612 //------------------------------------------------------------------
613 // ciObjectFactory::get_empty_methodData
614 //
615 // Get the ciMethodData representing the methodData for a method with
616 // none.
617 ciMethodData* ciObjectFactory::get_empty_methodData() {
618 ciMethodData* new_methodData = new (arena()) ciMethodData();
619 init_ident_of(new_methodData);
620 return new_methodData;
621 }
622
623 //------------------------------------------------------------------
624 // ciObjectFactory::get_return_address
625 //
626 // Get a ciReturnAddress for a specified bci.
627 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
628 for (int i = 0; i < _return_addresses.length(); i++) {
629 ciReturnAddress* entry = _return_addresses.at(i);
630 if (entry->bci() == bci) {
631 // We've found a match.
632 return entry;
633 }
634 }
635
636 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
637 init_ident_of(new_ret_addr);
638 _return_addresses.append(new_ret_addr);
639 return new_ret_addr;
640 }
641
642 // ------------------------------------------------------------------
643 // ciObjectFactory::init_ident_of
644 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
645 obj->set_ident(_next_ident++);
646 }
647
648 static ciObjectFactory::NonPermObject* emptyBucket = nullptr;
649
650 // ------------------------------------------------------------------
651 // ciObjectFactory::find_non_perm
652 //
653 // Use a small hash table, hashed on the klass of the key.
654 // If there is no entry in the cache corresponding to this oop, return
655 // the null tail of the bucket into which the oop should be inserted.
656 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(Handle keyHandle) {
657 assert(Universe::heap()->is_in(keyHandle()), "must be");
658 ciMetadata* klass = get_metadata(keyHandle->klass()); // This may safepoint!
659 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
660 for (NonPermObject* p; (p = (*bp)) != nullptr; bp = &p->next()) {
661 if (is_equal(p, keyHandle())) break;
662 }
663 return (*bp);
664 }
665
666
667
668 // ------------------------------------------------------------------
669 // Code for for NonPermObject
670 //
671 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
672 assert(ciObjectFactory::is_initialized(), "");
673 _object = object;
674 _next = bucket;
675 bucket = this;
676 }
677
678
679
680 // ------------------------------------------------------------------
681 // ciObjectFactory::insert_non_perm
682 //
683 // Insert a ciObject into the non-perm table.
684 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, Handle keyHandle, ciObject* obj) {
685 assert(Universe::heap()->is_in_or_null(keyHandle()), "must be");
686 assert(&where != &emptyBucket, "must not try to fill empty bucket");
687 NonPermObject* p = new (arena()) NonPermObject(where, keyHandle(), obj);
688 assert(where == p && is_equal(p, keyHandle()) && p->object() == obj, "entry must match");
689 assert(find_non_perm(keyHandle) == p, "must find the same spot");
690 ++_non_perm_count;
691 }
692
693 // ------------------------------------------------------------------
694 // ciObjectFactory::vm_symbol_at
695 // Get the ciSymbol corresponding to some index in vmSymbols.
696 ciSymbol* ciObjectFactory::vm_symbol_at(vmSymbolID sid) {
697 int index = vmSymbols::as_int(sid);
698 return _shared_ci_symbols[index];
699 }
700
701 // ------------------------------------------------------------------
702 // ciObjectFactory::metadata_do
703 void ciObjectFactory::metadata_do(MetadataClosure* f) {
704 for (int j = 0; j < _ci_metadata.length(); j++) {
705 Metadata* o = _ci_metadata.at(j)->constant_encoding();
706 f->do_metadata(o);
707 }
708 }
709
710 // ------------------------------------------------------------------
711 // ciObjectFactory::print_contents_impl
712 void ciObjectFactory::print_contents_impl() {
713 int len = _ci_metadata.length();
714 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
715 for (int i = 0; i < len; i++) {
716 _ci_metadata.at(i)->print();
717 tty->cr();
718 }
719 }
720
721 // ------------------------------------------------------------------
722 // ciObjectFactory::print_contents
723 void ciObjectFactory::print_contents() {
724 print();
725 tty->cr();
726 GUARDED_VM_ENTRY(print_contents_impl();)
727 }
728
729 // ------------------------------------------------------------------
730 // ciObjectFactory::print
731 //
732 // Print debugging information about the object factory
733 void ciObjectFactory::print() {
734 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
735 _non_perm_count, _ci_metadata.length(), _unloaded_methods.length(),
736 _unloaded_instances.length(),
737 _unloaded_klasses.length());
738 }