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