1 /*
2 * Copyright (c) 1999, 2018, 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 "oops/oop.inline.hpp"
48 #include "runtime/fieldType.hpp"
49 #include "runtime/handles.inline.hpp"
50 #include "utilities/macros.hpp"
51
52 // ciObjectFactory
53 //
54 // This class handles requests for the creation of new instances
55 // of ciObject and its subclasses. It contains a caching mechanism
56 // which ensures that for each oop, at most one ciObject is created.
57 // This invariant allows more efficient implementation of ciObject.
58 //
59 // Implementation note: the oop->ciObject mapping is represented as
60 // a table stored in an array. Even though objects are moved
61 // by the garbage collector, the compactor preserves their relative
62 // order; address comparison of oops (in perm space) is safe so long
63 // as we prohibit GC during our comparisons. We currently use binary
64 // search to find the oop in the table, and inserting a new oop
65 // into the table may be costly. If this cost ends up being
66 // problematic the underlying data structure can be switched to some
67 // sort of balanced binary tree.
68
69 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL;
70 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::SID_LIMIT];
71 int ciObjectFactory::_shared_ident_limit = 0;
72 volatile bool ciObjectFactory::_initialized = false;
73
74
75 // ------------------------------------------------------------------
76 // ciObjectFactory::ciObjectFactory
77 ciObjectFactory::ciObjectFactory(Arena* arena,
78 int expected_size) {
79
80 for (int i = 0; i < NON_PERM_BUCKETS; i++) {
81 _non_perm_bucket[i] = NULL;
82 }
83 _non_perm_count = 0;
84
85 _next_ident = _shared_ident_limit;
86 _arena = arena;
87 _ci_metadata = new (arena) GrowableArray<ciMetadata*>(arena, expected_size, 0, NULL);
88
89 // If the shared ci objects exist append them to this factory's objects
90
91 if (_shared_ci_metadata != NULL) {
92 _ci_metadata->appendAll(_shared_ci_metadata);
93 }
94
95 _unloaded_methods = new (arena) GrowableArray<ciMethod*>(arena, 4, 0, NULL);
96 _unloaded_klasses = new (arena) GrowableArray<ciKlass*>(arena, 8, 0, NULL);
97 _unloaded_instances = new (arena) GrowableArray<ciInstance*>(arena, 4, 0, NULL);
98 _return_addresses =
99 new (arena) GrowableArray<ciReturnAddress*>(arena, 8, 0, NULL);
100
101 _symbols = new (arena) GrowableArray<ciSymbol*>(arena, 100, 0, NULL);
102 }
103
104 // ------------------------------------------------------------------
105 // ciObjectFactory::ciObjectFactory
106 void ciObjectFactory::initialize() {
107 ASSERT_IN_VM;
108 JavaThread* thread = JavaThread::current();
109 HandleMark handle_mark(thread);
110
111 // This Arena is long lived and exists in the resource mark of the
112 // compiler thread that initializes the initial ciObjectFactory which
113 // creates the shared ciObjects that all later ciObjectFactories use.
114 Arena* arena = new (mtCompiler) Arena(mtCompiler);
115 ciEnv initial(arena);
116 ciEnv* env = ciEnv::current();
117 env->_factory->init_shared_objects();
118
119 _initialized = true;
120
121 }
122
123 void ciObjectFactory::init_shared_objects() {
124
125 _next_ident = 1; // start numbering CI objects at 1
126
127 {
128 // Create the shared symbols, but not in _shared_ci_metadata.
129 int i;
130 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
131 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i);
132 assert(vmSymbols::find_sid(vmsym) == i, "1-1 mapping");
133 ciSymbol* sym = new (_arena) ciSymbol(vmsym, (vmSymbols::SID) i);
134 init_ident_of(sym);
135 _shared_ci_symbols[i] = sym;
136 }
137 #ifdef ASSERT
138 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
139 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i);
140 ciSymbol* sym = vm_symbol_at((vmSymbols::SID) i);
141 assert(sym->get_symbol() == vmsym, "oop must match");
142 }
143 assert(ciSymbol::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
144 #endif
145 }
146
147 _ci_metadata = new (_arena) GrowableArray<ciMetadata*>(_arena, 64, 0, NULL);
148
149 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
150 BasicType t = (BasicType)i;
151 if (type2name(t) != NULL && t != T_OBJECT && t != T_ARRAY && 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 WK_KLASS_DEFN(name, ignore_s) \
161 if (SystemDictionary::name##_is_loaded()) \
162 ciEnv::_##name = get_metadata(SystemDictionary::name())->as_instance_klass();
163
164 WK_KLASSES_DO(WK_KLASS_DEFN)
165 #undef WK_KLASS_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 }
175 }
176 }
177
178 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol());
179 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents
180 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, NULL, NULL);
181 init_ident_of(ciEnv::_unloaded_ciinstance_klass);
182 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
183 init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
184 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
185
186 get_metadata(Universe::boolArrayKlassObj());
187 get_metadata(Universe::charArrayKlassObj());
188 get_metadata(Universe::floatArrayKlassObj());
189 get_metadata(Universe::doubleArrayKlassObj());
190 get_metadata(Universe::byteArrayKlassObj());
191 get_metadata(Universe::shortArrayKlassObj());
192 get_metadata(Universe::intArrayKlassObj());
193 get_metadata(Universe::longArrayKlassObj());
194
195
196
197 assert(_non_perm_count == 0, "no shared non-perm objects");
198
199 // The shared_ident_limit is the first ident number that will
200 // be used for non-shared objects. That is, numbers less than
201 // this limit are permanently assigned to shared CI objects,
202 // while the higher numbers are recycled afresh by each new ciEnv.
203
204 _shared_ident_limit = _next_ident;
205 _shared_ci_metadata = _ci_metadata;
206 }
207
208
209 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) {
210 vmSymbols::SID sid = vmSymbols::find_sid(key);
211 if (sid != vmSymbols::NO_SID) {
212 // do not pollute the main cache with it
213 return vm_symbol_at(sid);
214 }
215
216 assert(vmSymbols::find_sid(key) == vmSymbols::NO_SID, "");
217 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbols::NO_SID);
218 _symbols->push(s);
219 return s;
220 }
221
222 // Decrement the refcount when done on symbols referenced by this compilation.
223 void ciObjectFactory::remove_symbols() {
224 for (int i = 0; i < _symbols->length(); i++) {
225 ciSymbol* s = _symbols->at(i);
226 s->get_symbol()->decrement_refcount();
227 }
228 // Since _symbols is resource allocated we're not allowed to delete it
229 // but it'll go away just the same.
230 }
231
232 // ------------------------------------------------------------------
233 // ciObjectFactory::get
234 //
235 // Get the ciObject corresponding to some oop. If the ciObject has
236 // already been created, it is returned. Otherwise, a new ciObject
237 // is created.
238 ciObject* ciObjectFactory::get(oop key) {
239 ASSERT_IN_VM;
240
241 assert(Universe::heap()->is_in_reserved(key), "must be");
242
243 NonPermObject* &bucket = find_non_perm(key);
244 if (bucket != NULL) {
245 return bucket->object();
246 }
247
248 // The ciObject does not yet exist. Create it and insert it
249 // into the cache.
250 Handle keyHandle(Thread::current(), key);
251 ciObject* new_object = create_new_object(keyHandle());
252 assert(oopDesc::equals(keyHandle(), new_object->get_oop()), "must be properly recorded");
253 init_ident_of(new_object);
254 assert(Universe::heap()->is_in_reserved(new_object->get_oop()), "must be");
255
256 // Not a perm-space object.
257 insert_non_perm(bucket, keyHandle(), new_object);
258 return new_object;
259 }
260
261 int ciObjectFactory::metadata_compare(Metadata* const& key, ciMetadata* const& elt) {
262 Metadata* value = elt->constant_encoding();
263 if (key < value) return -1;
264 else if (key > value) return 1;
265 else return 0;
266 }
267
268 // ------------------------------------------------------------------
269 // ciObjectFactory::cached_metadata
270 //
271 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
272 // already been created, it is returned. Otherwise, null is returned.
273 ciMetadata* ciObjectFactory::cached_metadata(Metadata* key) {
274 ASSERT_IN_VM;
275
276 bool found = false;
277 int index = _ci_metadata->find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
278
279 if (!found) {
280 return NULL;
281 }
282 return _ci_metadata->at(index)->as_metadata();
283 }
284
285
286 // ------------------------------------------------------------------
287 // ciObjectFactory::get_metadata
288 //
289 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
290 // already been created, it is returned. Otherwise, a new ciMetadata
291 // is created.
292 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
293 ASSERT_IN_VM;
294
295 #ifdef ASSERT
296 if (CIObjectFactoryVerify) {
297 Metadata* last = NULL;
298 for (int j = 0; j< _ci_metadata->length(); j++) {
299 Metadata* o = _ci_metadata->at(j)->constant_encoding();
300 assert(last < o, "out of order");
301 last = o;
302 }
303 }
304 #endif // ASSERT
305 int len = _ci_metadata->length();
306 bool found = false;
307 int index = _ci_metadata->find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
308 #ifdef ASSERT
309 if (CIObjectFactoryVerify) {
310 for (int i=0; i<_ci_metadata->length(); i++) {
311 if (_ci_metadata->at(i)->constant_encoding() == key) {
312 assert(index == i, " bad lookup");
313 }
314 }
315 }
316 #endif
317
318 if (!found) {
319 // The ciMetadata does not yet exist. Create it and insert it
320 // into the cache.
321 ciMetadata* new_object = create_new_metadata(key);
322 init_ident_of(new_object);
323 assert(new_object->is_metadata(), "must be");
324
325 if (len != _ci_metadata->length()) {
326 // creating the new object has recursively entered new objects
327 // into the table. We need to recompute our index.
328 index = _ci_metadata->find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
329 }
330 assert(!found, "no double insert");
331 _ci_metadata->insert_before(index, new_object);
332 return new_object;
333 }
334 return _ci_metadata->at(index)->as_metadata();
335 }
336
337 // ------------------------------------------------------------------
338 // ciObjectFactory::create_new_object
339 //
340 // Create a new ciObject from an oop.
341 //
342 // Implementation note: this functionality could be virtual behavior
343 // of the oop itself. For now, we explicitly marshal the object.
344 ciObject* ciObjectFactory::create_new_object(oop o) {
345 EXCEPTION_CONTEXT;
346
347 if (o->is_instance()) {
348 instanceHandle h_i(THREAD, (instanceOop)o);
349 if (java_lang_invoke_CallSite::is_instance(o))
350 return new (arena()) ciCallSite(h_i);
351 else if (java_lang_invoke_MemberName::is_instance(o))
352 return new (arena()) ciMemberName(h_i);
353 else if (java_lang_invoke_MethodHandle::is_instance(o))
354 return new (arena()) ciMethodHandle(h_i);
355 else if (java_lang_invoke_MethodType::is_instance(o))
356 return new (arena()) ciMethodType(h_i);
357 else
358 return new (arena()) ciInstance(h_i);
359 } else if (o->is_objArray()) {
360 objArrayHandle h_oa(THREAD, (objArrayOop)o);
361 return new (arena()) ciObjArray(h_oa);
362 } else if (o->is_typeArray()) {
363 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
364 return new (arena()) ciTypeArray(h_ta);
365 }
366
367 // The oop is of some type not supported by the compiler interface.
368 ShouldNotReachHere();
369 return NULL;
370 }
371
372 // ------------------------------------------------------------------
373 // ciObjectFactory::create_new_metadata
374 //
375 // Create a new ciMetadata from a Metadata*.
376 //
377 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
378 // is used, which points to it's holder.
379 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
380 EXCEPTION_CONTEXT;
381
382 if (o->is_klass()) {
383 Klass* k = (Klass*)o;
384 if (k->is_instance_klass()) {
385 return new (arena()) ciInstanceKlass(k);
386 } else if (k->is_objArray_klass()) {
387 return new (arena()) ciObjArrayKlass(k);
388 } else if (k->is_typeArray_klass()) {
389 return new (arena()) ciTypeArrayKlass(k);
390 }
391 } else if (o->is_method()) {
392 methodHandle h_m(THREAD, (Method*)o);
393 ciEnv *env = CURRENT_THREAD_ENV;
394 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
395 return new (arena()) ciMethod(h_m, holder);
396 } else if (o->is_methodData()) {
397 // Hold methodHandle alive - might not be necessary ???
398 methodHandle h_m(THREAD, ((MethodData*)o)->method());
399 return new (arena()) ciMethodData((MethodData*)o);
400 }
401
402 // The Metadata* is of some type not supported by the compiler interface.
403 ShouldNotReachHere();
404 return NULL;
405 }
406
407 //------------------------------------------------------------------
408 // ciObjectFactory::get_unloaded_method
409 //
410 // Get the ciMethod representing an unloaded/unfound method.
411 //
412 // Implementation note: unloaded methods are currently stored in
413 // an unordered array, requiring a linear-time lookup for each
414 // unloaded method. This may need to change.
415 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
416 ciSymbol* name,
417 ciSymbol* signature,
418 ciInstanceKlass* accessor) {
419 ciSignature* that = NULL;
420 for (int i = 0; i < _unloaded_methods->length(); i++) {
421 ciMethod* entry = _unloaded_methods->at(i);
422 if (entry->holder()->equals(holder) &&
423 entry->name()->equals(name) &&
424 entry->signature()->as_symbol()->equals(signature)) {
425 // Short-circuit slow resolve.
426 if (entry->signature()->accessing_klass() == accessor) {
427 // We've found a match.
428 return entry;
429 } else {
430 // Lazily create ciSignature
431 if (that == NULL) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
432 if (entry->signature()->equals(that)) {
433 // We've found a match.
434 return entry;
435 }
436 }
437 }
438 }
439
440 // This is a new unloaded method. Create it and stick it in
441 // the cache.
442 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
443
444 init_ident_of(new_method);
445 _unloaded_methods->append(new_method);
446
447 return new_method;
448 }
449
450 //------------------------------------------------------------------
451 // ciObjectFactory::get_unloaded_klass
452 //
453 // Get a ciKlass representing an unloaded klass.
454 //
455 // Implementation note: unloaded klasses are currently stored in
456 // an unordered array, requiring a linear-time lookup for each
457 // unloaded klass. This may need to change.
458 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
459 ciSymbol* name,
460 bool create_if_not_found) {
461 EXCEPTION_CONTEXT;
462 oop loader = NULL;
463 oop domain = NULL;
464 if (accessing_klass != NULL) {
465 loader = accessing_klass->loader();
466 domain = accessing_klass->protection_domain();
467 }
468 for (int i=0; i<_unloaded_klasses->length(); i++) {
469 ciKlass* entry = _unloaded_klasses->at(i);
470 if (entry->name()->equals(name) &&
471 oopDesc::equals(entry->loader(), loader) &&
472 oopDesc::equals(entry->protection_domain(), domain)) {
473 // We've found a match.
474 return entry;
475 }
476 }
477
478 if (!create_if_not_found)
479 return NULL;
480
481 // This is a new unloaded klass. Create it and stick it in
482 // the cache.
483 ciKlass* new_klass = NULL;
484
485 // Two cases: this is an unloaded ObjArrayKlass or an
486 // unloaded InstanceKlass. Deal with both.
487 if (name->char_at(0) == '[') {
488 // Decompose the name.'
489 FieldArrayInfo fd;
490 BasicType element_type = FieldType::get_array_info(name->get_symbol(),
491 fd, THREAD);
492 if (HAS_PENDING_EXCEPTION) {
493 CLEAR_PENDING_EXCEPTION;
494 CURRENT_THREAD_ENV->record_out_of_memory_failure();
495 return ciEnv::_unloaded_ciobjarrayklass;
496 }
497 int dimension = fd.dimension();
498 assert(element_type != T_ARRAY, "unsuccessful decomposition");
499 ciKlass* element_klass = NULL;
500 if (element_type == T_OBJECT) {
501 ciEnv *env = CURRENT_THREAD_ENV;
502 ciSymbol* ci_name = env->get_symbol(fd.object_key());
503 element_klass =
504 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
505 } else {
506 assert(dimension > 1, "one dimensional type arrays are always loaded.");
507
508 // The type array itself takes care of one of the dimensions.
509 dimension--;
510
511 // The element klass is a TypeArrayKlass.
512 element_klass = ciTypeArrayKlass::make(element_type);
513 }
514 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
515 } else {
516 jobject loader_handle = NULL;
517 jobject domain_handle = NULL;
518 if (accessing_klass != NULL) {
519 loader_handle = accessing_klass->loader_handle();
520 domain_handle = accessing_klass->protection_domain_handle();
521 }
522 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle);
523 }
524 init_ident_of(new_klass);
525 _unloaded_klasses->append(new_klass);
526
527 return new_klass;
528 }
529
530
531 //------------------------------------------------------------------
532 // ciObjectFactory::get_unloaded_instance
533 //
534 // Get a ciInstance representing an as-yet undetermined instance of a given class.
535 //
536 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
537 for (int i=0; i<_unloaded_instances->length(); i++) {
538 ciInstance* entry = _unloaded_instances->at(i);
539 if (entry->klass()->equals(instance_klass)) {
540 // We've found a match.
541 return entry;
542 }
543 }
544
545 // This is a new unloaded instance. Create it and stick it in
546 // the cache.
547 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
548
549 init_ident_of(new_instance);
550 _unloaded_instances->append(new_instance);
551
552 // make sure it looks the way we want:
553 assert(!new_instance->is_loaded(), "");
554 assert(new_instance->klass() == instance_klass, "");
555
556 return new_instance;
557 }
558
559
560 //------------------------------------------------------------------
561 // ciObjectFactory::get_unloaded_klass_mirror
562 //
563 // Get a ciInstance representing an unresolved klass mirror.
564 //
565 // Currently, this ignores the parameters and returns a unique unloaded instance.
566 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
567 assert(ciEnv::_Class_klass != NULL, "");
568 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
569 }
570
571 //------------------------------------------------------------------
572 // ciObjectFactory::get_unloaded_method_handle_constant
573 //
574 // Get a ciInstance representing an unresolved method handle constant.
575 //
576 // Currently, this ignores the parameters and returns a unique unloaded instance.
577 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
578 ciSymbol* name,
579 ciSymbol* signature,
580 int ref_kind) {
581 if (ciEnv::_MethodHandle_klass == NULL) return NULL;
582 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
583 }
584
585 //------------------------------------------------------------------
586 // ciObjectFactory::get_unloaded_method_type_constant
587 //
588 // Get a ciInstance representing an unresolved method type constant.
589 //
590 // Currently, this ignores the parameters and returns a unique unloaded instance.
591 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
592 if (ciEnv::_MethodType_klass == NULL) return NULL;
593 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
594 }
595
596 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
597 if (ciEnv::_Object_klass == NULL) return NULL;
598 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
599 }
600
601 //------------------------------------------------------------------
602 // ciObjectFactory::get_empty_methodData
603 //
604 // Get the ciMethodData representing the methodData for a method with
605 // none.
606 ciMethodData* ciObjectFactory::get_empty_methodData() {
607 ciMethodData* new_methodData = new (arena()) ciMethodData();
608 init_ident_of(new_methodData);
609 return new_methodData;
610 }
611
612 //------------------------------------------------------------------
613 // ciObjectFactory::get_return_address
614 //
615 // Get a ciReturnAddress for a specified bci.
616 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
617 for (int i=0; i<_return_addresses->length(); i++) {
618 ciReturnAddress* entry = _return_addresses->at(i);
619 if (entry->bci() == bci) {
620 // We've found a match.
621 return entry;
622 }
623 }
624
625 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
626 init_ident_of(new_ret_addr);
627 _return_addresses->append(new_ret_addr);
628 return new_ret_addr;
629 }
630
631 // ------------------------------------------------------------------
632 // ciObjectFactory::init_ident_of
633 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
634 obj->set_ident(_next_ident++);
635 }
636
637 static ciObjectFactory::NonPermObject* emptyBucket = NULL;
638
639 // ------------------------------------------------------------------
640 // ciObjectFactory::find_non_perm
641 //
642 // Use a small hash table, hashed on the klass of the key.
643 // If there is no entry in the cache corresponding to this oop, return
644 // the null tail of the bucket into which the oop should be inserted.
645 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
646 assert(Universe::heap()->is_in_reserved(key), "must be");
647 ciMetadata* klass = get_metadata(key->klass());
648 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
649 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) {
650 if (is_equal(p, key)) break;
651 }
652 return (*bp);
653 }
654
655
656
657 // ------------------------------------------------------------------
658 // Code for for NonPermObject
659 //
660 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
661 assert(ciObjectFactory::is_initialized(), "");
662 _object = object;
663 _next = bucket;
664 bucket = this;
665 }
666
667
668
669 // ------------------------------------------------------------------
670 // ciObjectFactory::insert_non_perm
671 //
672 // Insert a ciObject into the non-perm table.
673 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
674 assert(Universe::heap()->is_in_reserved_or_null(key), "must be");
675 assert(&where != &emptyBucket, "must not try to fill empty bucket");
676 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
677 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
678 assert(find_non_perm(key) == p, "must find the same spot");
679 ++_non_perm_count;
680 }
681
682 // ------------------------------------------------------------------
683 // ciObjectFactory::vm_symbol_at
684 // Get the ciSymbol corresponding to some index in vmSymbols.
685 ciSymbol* ciObjectFactory::vm_symbol_at(int index) {
686 assert(index >= vmSymbols::FIRST_SID && index < vmSymbols::SID_LIMIT, "oob");
687 return _shared_ci_symbols[index];
688 }
689
690 // ------------------------------------------------------------------
691 // ciObjectFactory::metadata_do
692 void ciObjectFactory::metadata_do(void f(Metadata*)) {
693 if (_ci_metadata == NULL) return;
694 for (int j = 0; j< _ci_metadata->length(); j++) {
695 Metadata* o = _ci_metadata->at(j)->constant_encoding();
696 f(o);
697 }
698 }
699
700 // ------------------------------------------------------------------
701 // ciObjectFactory::print_contents_impl
702 void ciObjectFactory::print_contents_impl() {
703 int len = _ci_metadata->length();
704 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
705 for (int i=0; i<len; i++) {
706 _ci_metadata->at(i)->print();
707 tty->cr();
708 }
709 }
710
711 // ------------------------------------------------------------------
712 // ciObjectFactory::print_contents
713 void ciObjectFactory::print_contents() {
714 print();
715 tty->cr();
716 GUARDED_VM_ENTRY(print_contents_impl();)
717 }
718
719 // ------------------------------------------------------------------
720 // ciObjectFactory::print
721 //
722 // Print debugging information about the object factory
723 void ciObjectFactory::print() {
724 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
725 _non_perm_count, _ci_metadata->length(), _unloaded_methods->length(),
726 _unloaded_instances->length(),
727 _unloaded_klasses->length());
728 }