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