1 /*
2 * Copyright (c) 1999, 2017, 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 "precompiled.hpp"
26 #include "ci/ciCallSite.hpp"
27 #include "ci/ciInstance.hpp"
28 #include "ci/ciInstanceKlass.hpp"
29 #include "ci/ciMemberName.hpp"
30 #include "ci/ciMethod.hpp"
31 #include "ci/ciMethodData.hpp"
32 #include "ci/ciMethodHandle.hpp"
33 #include "ci/ciMethodType.hpp"
34 #include "ci/ciNullObject.hpp"
35 #include "ci/ciObjArray.hpp"
36 #include "ci/ciObjArrayKlass.hpp"
37 #include "ci/ciObject.hpp"
38 #include "ci/ciObjectFactory.hpp"
39 #include "ci/ciSymbol.hpp"
40 #include "ci/ciTypeArray.hpp"
41 #include "ci/ciTypeArrayKlass.hpp"
42 #include "ci/ciUtilities.hpp"
43 #include "classfile/javaClasses.inline.hpp"
44 #include "classfile/systemDictionary.hpp"
45 #include "gc/shared/collectedHeap.inline.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "runtime/fieldType.hpp"
49 #include "utilities/macros.hpp"
50 #if INCLUDE_ALL_GCS
51 # include "gc/g1/g1SATBCardTableModRefBS.hpp"
52 #endif
53
54 // ciObjectFactory
55 //
56 // This class handles requests for the creation of new instances
57 // of ciObject and its subclasses. It contains a caching mechanism
58 // which ensures that for each oop, at most one ciObject is created.
59 // This invariant allows more efficient implementation of ciObject.
60 //
61 // Implementation note: the oop->ciObject mapping is represented as
62 // a table stored in an array. Even though objects are moved
63 // by the garbage collector, the compactor preserves their relative
64 // order; address comparison of oops (in perm space) is safe so long
65 // as we prohibit GC during our comparisons. We currently use binary
66 // search to find the oop in the table, and inserting a new oop
67 // into the table may be costly. If this cost ends up being
68 // problematic the underlying data structure can be switched to some
69 // sort of balanced binary tree.
70
71 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL;
72 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::SID_LIMIT];
73 int ciObjectFactory::_shared_ident_limit = 0;
74 volatile bool ciObjectFactory::_initialized = false;
75
76
77 // ------------------------------------------------------------------
78 // ciObjectFactory::ciObjectFactory
79 ciObjectFactory::ciObjectFactory(Arena* arena,
80 int expected_size) {
81
82 for (int i = 0; i < NON_PERM_BUCKETS; i++) {
83 _non_perm_bucket[i] = NULL;
84 }
85 _non_perm_count = 0;
86
87 _next_ident = _shared_ident_limit;
88 _arena = arena;
89 _ci_metadata = new (arena) GrowableArray<ciMetadata*>(arena, expected_size, 0, NULL);
90
91 // If the shared ci objects exist append them to this factory's objects
92
93 if (_shared_ci_metadata != NULL) {
94 _ci_metadata->appendAll(_shared_ci_metadata);
95 }
96
97 _unloaded_methods = new (arena) GrowableArray<ciMethod*>(arena, 4, 0, NULL);
98 _unloaded_klasses = new (arena) GrowableArray<ciKlass*>(arena, 8, 0, NULL);
99 _unloaded_instances = new (arena) GrowableArray<ciInstance*>(arena, 4, 0, NULL);
100 _return_addresses =
101 new (arena) GrowableArray<ciReturnAddress*>(arena, 8, 0, NULL);
102
103 _symbols = new (arena) GrowableArray<ciSymbol*>(arena, 100, 0, NULL);
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 int i;
132 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
133 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i);
134 assert(vmSymbols::find_sid(vmsym) == i, "1-1 mapping");
135 ciSymbol* sym = new (_arena) ciSymbol(vmsym, (vmSymbols::SID) i);
136 init_ident_of(sym);
137 _shared_ci_symbols[i] = sym;
138 }
139 #ifdef ASSERT
140 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
141 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i);
142 ciSymbol* sym = vm_symbol_at((vmSymbols::SID) i);
143 assert(sym->get_symbol() == vmsym, "oop must match");
144 }
145 assert(ciSymbol::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
146 #endif
147 }
148
149 _ci_metadata = new (_arena) GrowableArray<ciMetadata*>(_arena, 64, 0, NULL);
150
151 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
152 BasicType t = (BasicType)i;
153 if (type2name(t) != NULL && t != T_OBJECT && t != T_ARRAY && t != T_NARROWOOP && t != T_NARROWKLASS) {
154 ciType::_basic_types[t] = new (_arena) ciType(t);
155 init_ident_of(ciType::_basic_types[t]);
156 }
157 }
158
159 ciEnv::_null_object_instance = new (_arena) ciNullObject();
160 init_ident_of(ciEnv::_null_object_instance);
161
162 #define WK_KLASS_DEFN(name, ignore_s, opt) \
163 if (SystemDictionary::name() != NULL) \
164 ciEnv::_##name = get_metadata(SystemDictionary::name())->as_instance_klass();
165
166 WK_KLASSES_DO(WK_KLASS_DEFN)
167 #undef WK_KLASS_DEFN
168
169 for (int len = -1; len != _ci_metadata->length(); ) {
170 len = _ci_metadata->length();
171 for (int i2 = 0; i2 < len; i2++) {
172 ciMetadata* obj = _ci_metadata->at(i2);
173 assert (obj->is_metadata(), "what else would it be?");
174 if (obj->is_loaded() && obj->is_instance_klass()) {
175 obj->as_instance_klass()->compute_nonstatic_fields();
176 }
177 }
178 }
179
180 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol());
181 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents
182 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, NULL, NULL);
183 init_ident_of(ciEnv::_unloaded_ciinstance_klass);
184 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
185 init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
186 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
187
188 get_metadata(Universe::boolArrayKlassObj());
189 get_metadata(Universe::charArrayKlassObj());
190 get_metadata(Universe::singleArrayKlassObj());
191 get_metadata(Universe::doubleArrayKlassObj());
192 get_metadata(Universe::byteArrayKlassObj());
193 get_metadata(Universe::shortArrayKlassObj());
194 get_metadata(Universe::intArrayKlassObj());
195 get_metadata(Universe::longArrayKlassObj());
196
197
198
199 assert(_non_perm_count == 0, "no shared non-perm objects");
200
201 // The shared_ident_limit is the first ident number that will
202 // be used for non-shared objects. That is, numbers less than
203 // this limit are permanently assigned to shared CI objects,
204 // while the higher numbers are recycled afresh by each new ciEnv.
205
206 _shared_ident_limit = _next_ident;
207 _shared_ci_metadata = _ci_metadata;
208 }
209
210
211 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) {
212 vmSymbols::SID sid = vmSymbols::find_sid(key);
213 if (sid != vmSymbols::NO_SID) {
214 // do not pollute the main cache with it
215 return vm_symbol_at(sid);
216 }
217
218 assert(vmSymbols::find_sid(key) == vmSymbols::NO_SID, "");
219 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbols::NO_SID);
220 _symbols->push(s);
221 return s;
222 }
223
224 // Decrement the refcount when done on symbols referenced by this compilation.
225 void ciObjectFactory::remove_symbols() {
226 for (int i = 0; i < _symbols->length(); i++) {
227 ciSymbol* s = _symbols->at(i);
228 s->get_symbol()->decrement_refcount();
229 }
230 // Since _symbols is resource allocated we're not allowed to delete it
231 // but it'll go away just the same.
232 }
233
234 // ------------------------------------------------------------------
235 // ciObjectFactory::get
236 //
237 // Get the ciObject corresponding to some oop. If the ciObject has
238 // already been created, it is returned. Otherwise, a new ciObject
239 // is created.
240 ciObject* ciObjectFactory::get(oop key) {
241 ASSERT_IN_VM;
242
243 assert(GC::gc()->heap()->is_in_reserved(key), "must be");
244
245 NonPermObject* &bucket = find_non_perm(key);
246 if (bucket != NULL) {
247 return bucket->object();
248 }
249
250 // The ciObject does not yet exist. Create it and insert it
251 // into the cache.
252 Handle keyHandle(Thread::current(), key);
253 ciObject* new_object = create_new_object(keyHandle());
254 assert(keyHandle() == new_object->get_oop(), "must be properly recorded");
255 init_ident_of(new_object);
256 assert(GC::gc()->heap()->is_in_reserved(new_object->get_oop()), "must be");
257
258 // Not a perm-space object.
259 insert_non_perm(bucket, keyHandle(), new_object);
260 return new_object;
261 }
262
263 int ciObjectFactory::metadata_compare(Metadata* const& key, ciMetadata* const& elt) {
264 Metadata* value = elt->constant_encoding();
265 if (key < value) return -1;
266 else if (key > value) return 1;
267 else return 0;
268 }
269
270 // ------------------------------------------------------------------
271 // ciObjectFactory::get_metadata
272 //
273 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
274 // already been created, it is returned. Otherwise, a new ciMetadata
275 // is created.
276 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
277 ASSERT_IN_VM;
278
279 #ifdef ASSERT
280 if (CIObjectFactoryVerify) {
281 Metadata* last = NULL;
282 for (int j = 0; j< _ci_metadata->length(); j++) {
283 Metadata* o = _ci_metadata->at(j)->constant_encoding();
284 assert(last < o, "out of order");
285 last = o;
286 }
287 }
288 #endif // ASSERT
289 int len = _ci_metadata->length();
290 bool found = false;
291 int index = _ci_metadata->find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
292 #ifdef ASSERT
293 if (CIObjectFactoryVerify) {
294 for (int i=0; i<_ci_metadata->length(); i++) {
295 if (_ci_metadata->at(i)->constant_encoding() == key) {
296 assert(index == i, " bad lookup");
297 }
298 }
299 }
300 #endif
301
302 if (!found) {
303 // The ciMetadata does not yet exist. Create it and insert it
304 // into the cache.
305 ciMetadata* new_object = create_new_metadata(key);
306 init_ident_of(new_object);
307 assert(new_object->is_metadata(), "must be");
308
309 if (len != _ci_metadata->length()) {
310 // creating the new object has recursively entered new objects
311 // into the table. We need to recompute our index.
312 index = _ci_metadata->find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
313 }
314 assert(!found, "no double insert");
315 _ci_metadata->insert_before(index, new_object);
316 return new_object;
317 }
318 return _ci_metadata->at(index)->as_metadata();
319 }
320
321 // ------------------------------------------------------------------
322 // ciObjectFactory::create_new_object
323 //
324 // Create a new ciObject from an oop.
325 //
326 // Implementation note: this functionality could be virtual behavior
327 // of the oop itself. For now, we explicitly marshal the object.
328 ciObject* ciObjectFactory::create_new_object(oop o) {
329 EXCEPTION_CONTEXT;
330
331 if (o->is_instance()) {
332 instanceHandle h_i(THREAD, (instanceOop)o);
333 if (java_lang_invoke_CallSite::is_instance(o))
334 return new (arena()) ciCallSite(h_i);
335 else if (java_lang_invoke_MemberName::is_instance(o))
336 return new (arena()) ciMemberName(h_i);
337 else if (java_lang_invoke_MethodHandle::is_instance(o))
338 return new (arena()) ciMethodHandle(h_i);
339 else if (java_lang_invoke_MethodType::is_instance(o))
340 return new (arena()) ciMethodType(h_i);
341 else
342 return new (arena()) ciInstance(h_i);
343 } else if (o->is_objArray()) {
344 objArrayHandle h_oa(THREAD, (objArrayOop)o);
345 return new (arena()) ciObjArray(h_oa);
346 } else if (o->is_typeArray()) {
347 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
348 return new (arena()) ciTypeArray(h_ta);
349 }
350
351 // The oop is of some type not supported by the compiler interface.
352 ShouldNotReachHere();
353 return NULL;
354 }
355
356 // ------------------------------------------------------------------
357 // ciObjectFactory::create_new_metadata
358 //
359 // Create a new ciMetadata from a Metadata*.
360 //
361 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
362 // is used, which points to it's holder.
363 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
364 EXCEPTION_CONTEXT;
365
366 // Hold metadata from unloading by keeping it's holder alive.
367 if (_initialized && o->is_klass()) {
368 Klass* holder = ((Klass*)o);
369 if (holder->is_instance_klass() && InstanceKlass::cast(holder)->is_anonymous()) {
370 // Though ciInstanceKlass records class loader oop, it's not enough to keep
371 // VM anonymous classes alive (loader == NULL). Klass holder should be used instead.
372 // It is enough to record a ciObject, since cached elements are never removed
373 // during ciObjectFactory lifetime. ciObjectFactory itself is created for
374 // every compilation and lives for the whole duration of the compilation.
375 ciObject* h = get(holder->klass_holder());
376 }
377 }
378
379 if (o->is_klass()) {
380 Klass* k = (Klass*)o;
381 if (k->is_instance_klass()) {
382 return new (arena()) ciInstanceKlass(k);
383 } else if (k->is_objArray_klass()) {
384 return new (arena()) ciObjArrayKlass(k);
385 } else if (k->is_typeArray_klass()) {
386 return new (arena()) ciTypeArrayKlass(k);
387 }
388 } else if (o->is_method()) {
389 methodHandle h_m(THREAD, (Method*)o);
390 ciEnv *env = CURRENT_THREAD_ENV;
391 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
392 return new (arena()) ciMethod(h_m, holder);
393 } else if (o->is_methodData()) {
394 // Hold methodHandle alive - might not be necessary ???
395 methodHandle h_m(THREAD, ((MethodData*)o)->method());
396 return new (arena()) ciMethodData((MethodData*)o);
397 }
398
399 // The Metadata* is of some type not supported by the compiler interface.
400 ShouldNotReachHere();
401 return NULL;
402 }
403
404 // ------------------------------------------------------------------
405 // ciObjectFactory::ensure_metadata_alive
406 //
407 // Ensure that the metadata wrapped by the ciMetadata is kept alive by GC.
408 // This is primarily useful for metadata which is considered as weak roots
409 // by the GC but need to be strong roots if reachable from a current compilation.
410 //
411 void ciObjectFactory::ensure_metadata_alive(ciMetadata* m) {
412 ASSERT_IN_VM; // We're handling raw oops here.
413
414 #if INCLUDE_ALL_GCS
415 if (!UseG1GC) {
416 return;
417 }
418 Klass* metadata_owner_klass;
419 if (m->is_klass()) {
420 metadata_owner_klass = m->as_klass()->get_Klass();
421 } else if (m->is_method()) {
422 metadata_owner_klass = m->as_method()->get_Method()->constants()->pool_holder();
423 } else {
424 fatal("Not implemented for other types of metadata");
425 return;
426 }
427
428 oop metadata_holder = metadata_owner_klass->klass_holder();
429 if (metadata_holder != NULL) {
430 G1SATBCardTableModRefBS::enqueue(metadata_holder);
431 }
432
433 #endif
434 }
435
436 //------------------------------------------------------------------
437 // ciObjectFactory::get_unloaded_method
438 //
439 // Get the ciMethod representing an unloaded/unfound method.
440 //
441 // Implementation note: unloaded methods are currently stored in
442 // an unordered array, requiring a linear-time lookup for each
443 // unloaded method. This may need to change.
444 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
445 ciSymbol* name,
446 ciSymbol* signature,
447 ciInstanceKlass* accessor) {
448 ciSignature* that = NULL;
449 for (int i = 0; i < _unloaded_methods->length(); i++) {
450 ciMethod* entry = _unloaded_methods->at(i);
451 if (entry->holder()->equals(holder) &&
452 entry->name()->equals(name) &&
453 entry->signature()->as_symbol()->equals(signature)) {
454 // Short-circuit slow resolve.
455 if (entry->signature()->accessing_klass() == accessor) {
456 // We've found a match.
457 return entry;
458 } else {
459 // Lazily create ciSignature
460 if (that == NULL) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
461 if (entry->signature()->equals(that)) {
462 // We've found a match.
463 return entry;
464 }
465 }
466 }
467 }
468
469 // This is a new unloaded method. Create it and stick it in
470 // the cache.
471 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
472
473 init_ident_of(new_method);
474 _unloaded_methods->append(new_method);
475
476 return new_method;
477 }
478
479 //------------------------------------------------------------------
480 // ciObjectFactory::get_unloaded_klass
481 //
482 // Get a ciKlass representing an unloaded klass.
483 //
484 // Implementation note: unloaded klasses are currently stored in
485 // an unordered array, requiring a linear-time lookup for each
486 // unloaded klass. This may need to change.
487 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
488 ciSymbol* name,
489 bool create_if_not_found) {
490 EXCEPTION_CONTEXT;
491 oop loader = NULL;
492 oop domain = NULL;
493 if (accessing_klass != NULL) {
494 loader = accessing_klass->loader();
495 domain = accessing_klass->protection_domain();
496 }
497 for (int i=0; i<_unloaded_klasses->length(); i++) {
498 ciKlass* entry = _unloaded_klasses->at(i);
499 if (entry->name()->equals(name) &&
500 entry->loader() == loader &&
501 entry->protection_domain() == domain) {
502 // We've found a match.
503 return entry;
504 }
505 }
506
507 if (!create_if_not_found)
508 return NULL;
509
510 // This is a new unloaded klass. Create it and stick it in
511 // the cache.
512 ciKlass* new_klass = NULL;
513
514 // Two cases: this is an unloaded ObjArrayKlass or an
515 // unloaded InstanceKlass. Deal with both.
516 if (name->byte_at(0) == '[') {
517 // Decompose the name.'
518 FieldArrayInfo fd;
519 BasicType element_type = FieldType::get_array_info(name->get_symbol(),
520 fd, THREAD);
521 if (HAS_PENDING_EXCEPTION) {
522 CLEAR_PENDING_EXCEPTION;
523 CURRENT_THREAD_ENV->record_out_of_memory_failure();
524 return ciEnv::_unloaded_ciobjarrayklass;
525 }
526 int dimension = fd.dimension();
527 assert(element_type != T_ARRAY, "unsuccessful decomposition");
528 ciKlass* element_klass = NULL;
529 if (element_type == T_OBJECT) {
530 ciEnv *env = CURRENT_THREAD_ENV;
531 ciSymbol* ci_name = env->get_symbol(fd.object_key());
532 element_klass =
533 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
534 } else {
535 assert(dimension > 1, "one dimensional type arrays are always loaded.");
536
537 // The type array itself takes care of one of the dimensions.
538 dimension--;
539
540 // The element klass is a TypeArrayKlass.
541 element_klass = ciTypeArrayKlass::make(element_type);
542 }
543 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
544 } else {
545 jobject loader_handle = NULL;
546 jobject domain_handle = NULL;
547 if (accessing_klass != NULL) {
548 loader_handle = accessing_klass->loader_handle();
549 domain_handle = accessing_klass->protection_domain_handle();
550 }
551 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle);
552 }
553 init_ident_of(new_klass);
554 _unloaded_klasses->append(new_klass);
555
556 return new_klass;
557 }
558
559
560 //------------------------------------------------------------------
561 // ciObjectFactory::get_unloaded_instance
562 //
563 // Get a ciInstance representing an as-yet undetermined instance of a given class.
564 //
565 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
566 for (int i=0; i<_unloaded_instances->length(); i++) {
567 ciInstance* entry = _unloaded_instances->at(i);
568 if (entry->klass()->equals(instance_klass)) {
569 // We've found a match.
570 return entry;
571 }
572 }
573
574 // This is a new unloaded instance. Create it and stick it in
575 // the cache.
576 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
577
578 init_ident_of(new_instance);
579 _unloaded_instances->append(new_instance);
580
581 // make sure it looks the way we want:
582 assert(!new_instance->is_loaded(), "");
583 assert(new_instance->klass() == instance_klass, "");
584
585 return new_instance;
586 }
587
588
589 //------------------------------------------------------------------
590 // ciObjectFactory::get_unloaded_klass_mirror
591 //
592 // Get a ciInstance representing an unresolved klass mirror.
593 //
594 // Currently, this ignores the parameters and returns a unique unloaded instance.
595 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
596 assert(ciEnv::_Class_klass != NULL, "");
597 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
598 }
599
600 //------------------------------------------------------------------
601 // ciObjectFactory::get_unloaded_method_handle_constant
602 //
603 // Get a ciInstance representing an unresolved method handle constant.
604 //
605 // Currently, this ignores the parameters and returns a unique unloaded instance.
606 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
607 ciSymbol* name,
608 ciSymbol* signature,
609 int ref_kind) {
610 if (ciEnv::_MethodHandle_klass == NULL) return NULL;
611 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
612 }
613
614 //------------------------------------------------------------------
615 // ciObjectFactory::get_unloaded_method_type_constant
616 //
617 // Get a ciInstance representing an unresolved method type constant.
618 //
619 // Currently, this ignores the parameters and returns a unique unloaded instance.
620 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
621 if (ciEnv::_MethodType_klass == NULL) return NULL;
622 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
623 }
624
625 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
626 if (ciEnv::_Object_klass == NULL) return NULL;
627 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
628 }
629
630 //------------------------------------------------------------------
631 // ciObjectFactory::get_empty_methodData
632 //
633 // Get the ciMethodData representing the methodData for a method with
634 // none.
635 ciMethodData* ciObjectFactory::get_empty_methodData() {
636 ciMethodData* new_methodData = new (arena()) ciMethodData();
637 init_ident_of(new_methodData);
638 return new_methodData;
639 }
640
641 //------------------------------------------------------------------
642 // ciObjectFactory::get_return_address
643 //
644 // Get a ciReturnAddress for a specified bci.
645 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
646 for (int i=0; i<_return_addresses->length(); i++) {
647 ciReturnAddress* entry = _return_addresses->at(i);
648 if (entry->bci() == bci) {
649 // We've found a match.
650 return entry;
651 }
652 }
653
654 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
655 init_ident_of(new_ret_addr);
656 _return_addresses->append(new_ret_addr);
657 return new_ret_addr;
658 }
659
660 // ------------------------------------------------------------------
661 // ciObjectFactory::init_ident_of
662 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
663 obj->set_ident(_next_ident++);
664 }
665
666 static ciObjectFactory::NonPermObject* emptyBucket = NULL;
667
668 // ------------------------------------------------------------------
669 // ciObjectFactory::find_non_perm
670 //
671 // Use a small hash table, hashed on the klass of the key.
672 // If there is no entry in the cache corresponding to this oop, return
673 // the null tail of the bucket into which the oop should be inserted.
674 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
675 assert(GC::gc()->heap()->is_in_reserved(key), "must be");
676 ciMetadata* klass = get_metadata(key->klass());
677 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
678 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) {
679 if (is_equal(p, key)) break;
680 }
681 return (*bp);
682 }
683
684
685
686 // ------------------------------------------------------------------
687 // Code for for NonPermObject
688 //
689 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
690 assert(ciObjectFactory::is_initialized(), "");
691 _object = object;
692 _next = bucket;
693 bucket = this;
694 }
695
696
697
698 // ------------------------------------------------------------------
699 // ciObjectFactory::insert_non_perm
700 //
701 // Insert a ciObject into the non-perm table.
702 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
703 assert(GC::gc()->heap()->is_in_reserved_or_null(key), "must be");
704 assert(&where != &emptyBucket, "must not try to fill empty bucket");
705 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
706 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
707 assert(find_non_perm(key) == p, "must find the same spot");
708 ++_non_perm_count;
709 }
710
711 // ------------------------------------------------------------------
712 // ciObjectFactory::vm_symbol_at
713 // Get the ciSymbol corresponding to some index in vmSymbols.
714 ciSymbol* ciObjectFactory::vm_symbol_at(int index) {
715 assert(index >= vmSymbols::FIRST_SID && index < vmSymbols::SID_LIMIT, "oob");
716 return _shared_ci_symbols[index];
717 }
718
719 // ------------------------------------------------------------------
720 // ciObjectFactory::metadata_do
721 void ciObjectFactory::metadata_do(void f(Metadata*)) {
722 if (_ci_metadata == NULL) return;
723 for (int j = 0; j< _ci_metadata->length(); j++) {
724 Metadata* o = _ci_metadata->at(j)->constant_encoding();
725 f(o);
726 }
727 }
728
729 // ------------------------------------------------------------------
730 // ciObjectFactory::print_contents_impl
731 void ciObjectFactory::print_contents_impl() {
732 int len = _ci_metadata->length();
733 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
734 for (int i=0; i<len; i++) {
735 _ci_metadata->at(i)->print();
736 tty->cr();
737 }
738 }
739
740 // ------------------------------------------------------------------
741 // ciObjectFactory::print_contents
742 void ciObjectFactory::print_contents() {
743 print();
744 tty->cr();
745 GUARDED_VM_ENTRY(print_contents_impl();)
746 }
747
748 // ------------------------------------------------------------------
749 // ciObjectFactory::print
750 //
751 // Print debugging information about the object factory
752 void ciObjectFactory::print() {
753 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
754 _non_perm_count, _ci_metadata->length(), _unloaded_methods->length(),
755 _unloaded_instances->length(),
756 _unloaded_klasses->length());
757 }