1 /*
2 * Copyright (c) 1999, 2019, 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.inline.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 "memory/universe.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "runtime/fieldType.hpp"
50 #include "runtime/handles.inline.hpp"
51 #include "utilities/macros.hpp"
52
53 // ciObjectFactory
54 //
55 // This class handles requests for the creation of new instances
56 // of ciObject and its subclasses. It contains a caching mechanism
57 // which ensures that for each oop, at most one ciObject is created.
58 // This invariant allows more efficient implementation of ciObject.
59 //
60 // Implementation note: the oop->ciObject mapping is represented as
61 // a table stored in an array. Even though objects are moved
62 // by the garbage collector, the compactor preserves their relative
63 // order; address comparison of oops (in perm space) is safe so long
64 // as we prohibit GC during our comparisons. We currently use binary
65 // search to find the oop in the table, and inserting a new oop
66 // into the table may be costly. If this cost ends up being
67 // problematic the underlying data structure can be switched to some
68 // sort of balanced binary tree.
69
70 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL;
71 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::SID_LIMIT];
72 int ciObjectFactory::_shared_ident_limit = 0;
73 volatile bool ciObjectFactory::_initialized = false;
74
75
76 // ------------------------------------------------------------------
77 // ciObjectFactory::ciObjectFactory
78 ciObjectFactory::ciObjectFactory(Arena* arena,
79 int expected_size) {
80
81 for (int i = 0; i < NON_PERM_BUCKETS; i++) {
82 _non_perm_bucket[i] = NULL;
83 }
84 _non_perm_count = 0;
85
86 _next_ident = _shared_ident_limit;
87 _arena = arena;
88 _ci_metadata = new (arena) GrowableArray<ciMetadata*>(arena, expected_size, 0, NULL);
89
90 // If the shared ci objects exist append them to this factory's objects
91
92 if (_shared_ci_metadata != NULL) {
93 _ci_metadata->appendAll(_shared_ci_metadata);
94 }
95
96 _unloaded_methods = new (arena) GrowableArray<ciMethod*>(arena, 4, 0, NULL);
97 _unloaded_klasses = new (arena) GrowableArray<ciKlass*>(arena, 8, 0, NULL);
98 _unloaded_instances = new (arena) GrowableArray<ciInstance*>(arena, 4, 0, NULL);
99 _return_addresses =
100 new (arena) GrowableArray<ciReturnAddress*>(arena, 8, 0, NULL);
101
102 _symbols = new (arena) GrowableArray<ciSymbol*>(arena, 100, 0, NULL);
103 }
104
105 // ------------------------------------------------------------------
106 // ciObjectFactory::ciObjectFactory
107 void ciObjectFactory::initialize() {
108 ASSERT_IN_VM;
109 JavaThread* thread = JavaThread::current();
110 HandleMark handle_mark(thread);
111
112 // This Arena is long lived and exists in the resource mark of the
113 // compiler thread that initializes the initial ciObjectFactory which
114 // creates the shared ciObjects that all later ciObjectFactories use.
115 Arena* arena = new (mtCompiler) Arena(mtCompiler);
116 ciEnv initial(arena);
117 ciEnv* env = ciEnv::current();
118 env->_factory->init_shared_objects();
119
120 _initialized = true;
121
122 }
123
124 void ciObjectFactory::init_shared_objects() {
125
126 _next_ident = 1; // start numbering CI objects at 1
127
128 {
129 // Create the shared symbols, but not in _shared_ci_metadata.
130 int i;
131 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
132 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i);
133 assert(vmSymbols::find_sid(vmsym) == i, "1-1 mapping");
134 ciSymbol* sym = new (_arena) ciSymbol(vmsym, (vmSymbols::SID) i);
135 init_ident_of(sym);
136 _shared_ci_symbols[i] = sym;
137 }
138 #ifdef ASSERT
139 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
140 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i);
141 ciSymbol* sym = vm_symbol_at((vmSymbols::SID) i);
142 assert(sym->get_symbol() == vmsym, "oop must match");
143 }
144 assert(ciSymbol::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
145 #endif
146 }
147
148 _ci_metadata = new (_arena) GrowableArray<ciMetadata*>(_arena, 64, 0, NULL);
149
150 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
151 BasicType t = (BasicType)i;
152 if (type2name(t) != NULL && !is_reference_type(t) &&
153 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) \
163 if (SystemDictionary::name##_is_loaded()) \
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::floatArrayKlassObj());
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(Universe::heap()->is_in(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(Universe::heap()->is_in(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::cached_metadata
272 //
273 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
274 // already been created, it is returned. Otherwise, null is returned.
275 ciMetadata* ciObjectFactory::cached_metadata(Metadata* key) {
276 ASSERT_IN_VM;
277
278 bool found = false;
279 int index = _ci_metadata->find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
280
281 if (!found) {
282 return NULL;
283 }
284 return _ci_metadata->at(index)->as_metadata();
285 }
286
287
288 // ------------------------------------------------------------------
289 // ciObjectFactory::get_metadata
290 //
291 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
292 // already been created, it is returned. Otherwise, a new ciMetadata
293 // is created.
294 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
295 ASSERT_IN_VM;
296
297 #ifdef ASSERT
298 if (CIObjectFactoryVerify) {
299 Metadata* last = NULL;
300 for (int j = 0; j< _ci_metadata->length(); j++) {
301 Metadata* o = _ci_metadata->at(j)->constant_encoding();
302 assert(last < o, "out of order");
303 last = o;
304 }
305 }
306 #endif // ASSERT
307 int len = _ci_metadata->length();
308 bool found = false;
309 int index = _ci_metadata->find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
310 #ifdef ASSERT
311 if (CIObjectFactoryVerify) {
312 for (int i=0; i<_ci_metadata->length(); i++) {
313 if (_ci_metadata->at(i)->constant_encoding() == key) {
314 assert(index == i, " bad lookup");
315 }
316 }
317 }
318 #endif
319
320 if (!found) {
321 // The ciMetadata does not yet exist. Create it and insert it
322 // into the cache.
323 ciMetadata* new_object = create_new_metadata(key);
324 init_ident_of(new_object);
325 assert(new_object->is_metadata(), "must be");
326
327 if (len != _ci_metadata->length()) {
328 // creating the new object has recursively entered new objects
329 // into the table. We need to recompute our index.
330 index = _ci_metadata->find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
331 }
332 assert(!found, "no double insert");
333 _ci_metadata->insert_before(index, new_object);
334 return new_object;
335 }
336 return _ci_metadata->at(index)->as_metadata();
337 }
338
339 // ------------------------------------------------------------------
340 // ciObjectFactory::create_new_object
341 //
342 // Create a new ciObject from an oop.
343 //
344 // Implementation note: this functionality could be virtual behavior
345 // of the oop itself. For now, we explicitly marshal the object.
346 ciObject* ciObjectFactory::create_new_object(oop o) {
347 EXCEPTION_CONTEXT;
348
349 if (o->is_instance()) {
350 instanceHandle h_i(THREAD, (instanceOop)o);
351 if (java_lang_invoke_CallSite::is_instance(o))
352 return new (arena()) ciCallSite(h_i);
353 else if (java_lang_invoke_MemberName::is_instance(o))
354 return new (arena()) ciMemberName(h_i);
355 else if (java_lang_invoke_MethodHandle::is_instance(o))
356 return new (arena()) ciMethodHandle(h_i);
357 else if (java_lang_invoke_MethodType::is_instance(o))
358 return new (arena()) ciMethodType(h_i);
359 else
360 return new (arena()) ciInstance(h_i);
361 } else if (o->is_objArray()) {
362 objArrayHandle h_oa(THREAD, (objArrayOop)o);
363 return new (arena()) ciObjArray(h_oa);
364 } else if (o->is_typeArray()) {
365 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
366 return new (arena()) ciTypeArray(h_ta);
367 }
368
369 // The oop is of some type not supported by the compiler interface.
370 ShouldNotReachHere();
371 return NULL;
372 }
373
374 // ------------------------------------------------------------------
375 // ciObjectFactory::create_new_metadata
376 //
377 // Create a new ciMetadata from a Metadata*.
378 //
379 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
380 // is used, which points to it's holder.
381 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
382 EXCEPTION_CONTEXT;
383
384 if (o->is_klass()) {
385 Klass* k = (Klass*)o;
386 if (k->is_instance_klass()) {
387 return new (arena()) ciInstanceKlass(k);
388 } else if (k->is_objArray_klass()) {
389 return new (arena()) ciObjArrayKlass(k);
390 } else if (k->is_typeArray_klass()) {
391 return new (arena()) ciTypeArrayKlass(k);
392 }
393 } else if (o->is_method()) {
394 methodHandle h_m(THREAD, (Method*)o);
395 ciEnv *env = CURRENT_THREAD_ENV;
396 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
397 return new (arena()) ciMethod(h_m, holder);
398 } else if (o->is_methodData()) {
399 // Hold methodHandle alive - might not be necessary ???
400 methodHandle h_m(THREAD, ((MethodData*)o)->method());
401 return new (arena()) ciMethodData((MethodData*)o);
402 }
403
404 // The Metadata* is of some type not supported by the compiler interface.
405 ShouldNotReachHere();
406 return NULL;
407 }
408
409 //------------------------------------------------------------------
410 // ciObjectFactory::get_unloaded_method
411 //
412 // Get the ciMethod representing an unloaded/unfound method.
413 //
414 // Implementation note: unloaded methods are currently stored in
415 // an unordered array, requiring a linear-time lookup for each
416 // unloaded method. This may need to change.
417 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
418 ciSymbol* name,
419 ciSymbol* signature,
420 ciInstanceKlass* accessor) {
421 ciSignature* that = NULL;
422 for (int i = 0; i < _unloaded_methods->length(); i++) {
423 ciMethod* entry = _unloaded_methods->at(i);
424 if (entry->holder()->equals(holder) &&
425 entry->name()->equals(name) &&
426 entry->signature()->as_symbol()->equals(signature)) {
427 // Short-circuit slow resolve.
428 if (entry->signature()->accessing_klass() == accessor) {
429 // We've found a match.
430 return entry;
431 } else {
432 // Lazily create ciSignature
433 if (that == NULL) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
434 if (entry->signature()->equals(that)) {
435 // We've found a match.
436 return entry;
437 }
438 }
439 }
440 }
441
442 // This is a new unloaded method. Create it and stick it in
443 // the cache.
444 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
445
446 init_ident_of(new_method);
447 _unloaded_methods->append(new_method);
448
449 return new_method;
450 }
451
452 //------------------------------------------------------------------
453 // ciObjectFactory::get_unloaded_klass
454 //
455 // Get a ciKlass representing an unloaded klass.
456 //
457 // Implementation note: unloaded klasses are currently stored in
458 // an unordered array, requiring a linear-time lookup for each
459 // unloaded klass. This may need to change.
460 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
461 ciSymbol* name,
462 bool create_if_not_found) {
463 EXCEPTION_CONTEXT;
464 oop loader = NULL;
465 oop domain = NULL;
466 if (accessing_klass != NULL) {
467 loader = accessing_klass->loader();
468 domain = accessing_klass->protection_domain();
469 }
470 for (int i=0; i<_unloaded_klasses->length(); i++) {
471 ciKlass* entry = _unloaded_klasses->at(i);
472 if (entry->name()->equals(name) &&
473 entry->loader() == loader &&
474 entry->protection_domain() == domain) {
475 // We've found a match.
476 return entry;
477 }
478 }
479
480 if (!create_if_not_found)
481 return NULL;
482
483 // This is a new unloaded klass. Create it and stick it in
484 // the cache.
485 ciKlass* new_klass = NULL;
486
487 // Two cases: this is an unloaded ObjArrayKlass or an
488 // unloaded InstanceKlass. Deal with both.
489 if (name->char_at(0) == JVM_SIGNATURE_ARRAY) {
490 // Decompose the name.'
491 FieldArrayInfo fd;
492 BasicType element_type = FieldType::get_array_info(name->get_symbol(),
493 fd, THREAD);
494 if (HAS_PENDING_EXCEPTION) {
495 CLEAR_PENDING_EXCEPTION;
496 CURRENT_THREAD_ENV->record_out_of_memory_failure();
497 return ciEnv::_unloaded_ciobjarrayklass;
498 }
499 int dimension = fd.dimension();
500 assert(element_type != T_ARRAY, "unsuccessful decomposition");
501 ciKlass* element_klass = NULL;
502 if (element_type == T_OBJECT) {
503 ciEnv *env = CURRENT_THREAD_ENV;
504 ciSymbol* ci_name = env->get_symbol(fd.object_key());
505 element_klass =
506 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
507 } else {
508 assert(dimension > 1, "one dimensional type arrays are always loaded.");
509
510 // The type array itself takes care of one of the dimensions.
511 dimension--;
512
513 // The element klass is a TypeArrayKlass.
514 element_klass = ciTypeArrayKlass::make(element_type);
515 }
516 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
517 } else {
518 jobject loader_handle = NULL;
519 jobject domain_handle = NULL;
520 if (accessing_klass != NULL) {
521 loader_handle = accessing_klass->loader_handle();
522 domain_handle = accessing_klass->protection_domain_handle();
523 }
524 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle);
525 }
526 init_ident_of(new_klass);
527 _unloaded_klasses->append(new_klass);
528
529 return new_klass;
530 }
531
532
533 //------------------------------------------------------------------
534 // ciObjectFactory::get_unloaded_instance
535 //
536 // Get a ciInstance representing an as-yet undetermined instance of a given class.
537 //
538 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
539 for (int i=0; i<_unloaded_instances->length(); i++) {
540 ciInstance* entry = _unloaded_instances->at(i);
541 if (entry->klass()->equals(instance_klass)) {
542 // We've found a match.
543 return entry;
544 }
545 }
546
547 // This is a new unloaded instance. Create it and stick it in
548 // the cache.
549 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
550
551 init_ident_of(new_instance);
552 _unloaded_instances->append(new_instance);
553
554 // make sure it looks the way we want:
555 assert(!new_instance->is_loaded(), "");
556 assert(new_instance->klass() == instance_klass, "");
557
558 return new_instance;
559 }
560
561
562 //------------------------------------------------------------------
563 // ciObjectFactory::get_unloaded_klass_mirror
564 //
565 // Get a ciInstance representing an unresolved klass mirror.
566 //
567 // Currently, this ignores the parameters and returns a unique unloaded instance.
568 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
569 assert(ciEnv::_Class_klass != NULL, "");
570 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
571 }
572
573 //------------------------------------------------------------------
574 // ciObjectFactory::get_unloaded_method_handle_constant
575 //
576 // Get a ciInstance representing an unresolved method handle constant.
577 //
578 // Currently, this ignores the parameters and returns a unique unloaded instance.
579 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
580 ciSymbol* name,
581 ciSymbol* signature,
582 int ref_kind) {
583 if (ciEnv::_MethodHandle_klass == NULL) return NULL;
584 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
585 }
586
587 //------------------------------------------------------------------
588 // ciObjectFactory::get_unloaded_method_type_constant
589 //
590 // Get a ciInstance representing an unresolved method type constant.
591 //
592 // Currently, this ignores the parameters and returns a unique unloaded instance.
593 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
594 if (ciEnv::_MethodType_klass == NULL) return NULL;
595 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
596 }
597
598 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
599 if (ciEnv::_Object_klass == NULL) return NULL;
600 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
601 }
602
603 //------------------------------------------------------------------
604 // ciObjectFactory::get_empty_methodData
605 //
606 // Get the ciMethodData representing the methodData for a method with
607 // none.
608 ciMethodData* ciObjectFactory::get_empty_methodData() {
609 ciMethodData* new_methodData = new (arena()) ciMethodData();
610 init_ident_of(new_methodData);
611 return new_methodData;
612 }
613
614 //------------------------------------------------------------------
615 // ciObjectFactory::get_return_address
616 //
617 // Get a ciReturnAddress for a specified bci.
618 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
619 for (int i=0; i<_return_addresses->length(); i++) {
620 ciReturnAddress* entry = _return_addresses->at(i);
621 if (entry->bci() == bci) {
622 // We've found a match.
623 return entry;
624 }
625 }
626
627 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
628 init_ident_of(new_ret_addr);
629 _return_addresses->append(new_ret_addr);
630 return new_ret_addr;
631 }
632
633 // ------------------------------------------------------------------
634 // ciObjectFactory::init_ident_of
635 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
636 obj->set_ident(_next_ident++);
637 }
638
639 static ciObjectFactory::NonPermObject* emptyBucket = NULL;
640
641 // ------------------------------------------------------------------
642 // ciObjectFactory::find_non_perm
643 //
644 // Use a small hash table, hashed on the klass of the key.
645 // If there is no entry in the cache corresponding to this oop, return
646 // the null tail of the bucket into which the oop should be inserted.
647 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
648 assert(Universe::heap()->is_in(key), "must be");
649 ciMetadata* klass = get_metadata(key->klass());
650 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
651 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) {
652 if (is_equal(p, key)) break;
653 }
654 return (*bp);
655 }
656
657
658
659 // ------------------------------------------------------------------
660 // Code for for NonPermObject
661 //
662 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
663 assert(ciObjectFactory::is_initialized(), "");
664 _object = object;
665 _next = bucket;
666 bucket = this;
667 }
668
669
670
671 // ------------------------------------------------------------------
672 // ciObjectFactory::insert_non_perm
673 //
674 // Insert a ciObject into the non-perm table.
675 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
676 assert(Universe::heap()->is_in_or_null(key), "must be");
677 assert(&where != &emptyBucket, "must not try to fill empty bucket");
678 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
679 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
680 assert(find_non_perm(key) == p, "must find the same spot");
681 ++_non_perm_count;
682 }
683
684 // ------------------------------------------------------------------
685 // ciObjectFactory::vm_symbol_at
686 // Get the ciSymbol corresponding to some index in vmSymbols.
687 ciSymbol* ciObjectFactory::vm_symbol_at(int index) {
688 assert(index >= vmSymbols::FIRST_SID && index < vmSymbols::SID_LIMIT, "oob");
689 return _shared_ci_symbols[index];
690 }
691
692 // ------------------------------------------------------------------
693 // ciObjectFactory::metadata_do
694 void ciObjectFactory::metadata_do(MetadataClosure* f) {
695 if (_ci_metadata == NULL) return;
696 for (int j = 0; j< _ci_metadata->length(); j++) {
697 Metadata* o = _ci_metadata->at(j)->constant_encoding();
698 f->do_metadata(o);
699 }
700 }
701
702 // ------------------------------------------------------------------
703 // ciObjectFactory::print_contents_impl
704 void ciObjectFactory::print_contents_impl() {
705 int len = _ci_metadata->length();
706 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
707 for (int i=0; i<len; i++) {
708 _ci_metadata->at(i)->print();
709 tty->cr();
710 }
711 }
712
713 // ------------------------------------------------------------------
714 // ciObjectFactory::print_contents
715 void ciObjectFactory::print_contents() {
716 print();
717 tty->cr();
718 GUARDED_VM_ENTRY(print_contents_impl();)
719 }
720
721 // ------------------------------------------------------------------
722 // ciObjectFactory::print
723 //
724 // Print debugging information about the object factory
725 void ciObjectFactory::print() {
726 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
727 _non_perm_count, _ci_metadata->length(), _unloaded_methods->length(),
728 _unloaded_instances->length(),
729 _unloaded_klasses->length());
730 }