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/ciValueKlass.hpp"
30 #include "ci/ciMemberName.hpp"
31 #include "ci/ciMethod.hpp"
32 #include "ci/ciMethodData.hpp"
33 #include "ci/ciMethodHandle.hpp"
34 #include "ci/ciMethodType.hpp"
35 #include "ci/ciNullObject.hpp"
36 #include "ci/ciObjArray.hpp"
37 #include "ci/ciObjArrayKlass.hpp"
38 #include "ci/ciObject.hpp"
39 #include "ci/ciObjectFactory.hpp"
40 #include "ci/ciSymbol.hpp"
41 #include "ci/ciTypeArray.hpp"
42 #include "ci/ciTypeArrayKlass.hpp"
43 #include "ci/ciUtilities.inline.hpp"
44 #include "ci/ciValueArray.hpp"
45 #include "ci/ciValueArrayKlass.hpp"
46 #include "classfile/javaClasses.inline.hpp"
47 #include "classfile/systemDictionary.hpp"
48 #include "gc/shared/collectedHeap.inline.hpp"
49 #include "memory/allocation.inline.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "runtime/fieldType.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "utilities/macros.hpp"
54
55 // ciObjectFactory
56 //
57 // This class handles requests for the creation of new instances
58 // of ciObject and its subclasses. It contains a caching mechanism
59 // which ensures that for each oop, at most one ciObject is created.
60 // This invariant allows more efficient implementation of ciObject.
61 //
62 // Implementation note: the oop->ciObject mapping is represented as
63 // a table stored in an array. Even though objects are moved
64 // by the garbage collector, the compactor preserves their relative
65 // order; address comparison of oops (in perm space) is safe so long
66 // as we prohibit GC during our comparisons. We currently use binary
67 // search to find the oop in the table, and inserting a new oop
68 // into the table may be costly. If this cost ends up being
69 // problematic the underlying data structure can be switched to some
70 // sort of balanced binary tree.
71
72 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL;
73 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::SID_LIMIT];
74 int ciObjectFactory::_shared_ident_limit = 0;
75 volatile bool ciObjectFactory::_initialized = false;
76
77
78 // ------------------------------------------------------------------
79 // ciObjectFactory::ciObjectFactory
80 ciObjectFactory::ciObjectFactory(Arena* arena,
81 int expected_size) {
82
83 for (int i = 0; i < NON_PERM_BUCKETS; i++) {
84 _non_perm_bucket[i] = NULL;
85 }
86 _non_perm_count = 0;
87
88 _next_ident = _shared_ident_limit;
89 _arena = arena;
90 _ci_metadata = new (arena) GrowableArray<ciMetadata*>(arena, expected_size, 0, NULL);
91
92 // If the shared ci objects exist append them to this factory's objects
93
94 if (_shared_ci_metadata != NULL) {
95 _ci_metadata->appendAll(_shared_ci_metadata);
96 }
97
98 _unloaded_methods = new (arena) GrowableArray<ciMethod*>(arena, 4, 0, NULL);
99 _unloaded_klasses = new (arena) GrowableArray<ciKlass*>(arena, 8, 0, NULL);
100 _unloaded_instances = new (arena) GrowableArray<ciInstance*>(arena, 4, 0, NULL);
101 _return_addresses =
102 new (arena) GrowableArray<ciReturnAddress*>(arena, 8, 0, NULL);
103
104 _symbols = new (arena) GrowableArray<ciSymbol*>(arena, 100, 0, NULL);
105 }
106
107 // ------------------------------------------------------------------
108 // ciObjectFactory::ciObjectFactory
109 void ciObjectFactory::initialize() {
110 ASSERT_IN_VM;
111 JavaThread* thread = JavaThread::current();
112 HandleMark handle_mark(thread);
113
114 // This Arena is long lived and exists in the resource mark of the
115 // compiler thread that initializes the initial ciObjectFactory which
116 // creates the shared ciObjects that all later ciObjectFactories use.
117 Arena* arena = new (mtCompiler) Arena(mtCompiler);
118 ciEnv initial(arena);
119 ciEnv* env = ciEnv::current();
120 env->_factory->init_shared_objects();
121
122 _initialized = true;
123
124 }
125
126 void ciObjectFactory::init_shared_objects() {
127
128 _next_ident = 1; // start numbering CI objects at 1
129
130 {
131 // Create the shared symbols, but not in _shared_ci_metadata.
132 int i;
133 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
134 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i);
135 assert(vmSymbols::find_sid(vmsym) == i, "1-1 mapping");
136 ciSymbol* sym = new (_arena) ciSymbol(vmsym, (vmSymbols::SID) i);
137 init_ident_of(sym);
138 _shared_ci_symbols[i] = sym;
139 }
140 #ifdef ASSERT
141 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
142 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i);
143 ciSymbol* sym = vm_symbol_at((vmSymbols::SID) i);
144 assert(sym->get_symbol() == vmsym, "oop must match");
145 }
146 assert(ciSymbol::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
147 #endif
148 }
149
150 _ci_metadata = new (_arena) GrowableArray<ciMetadata*>(_arena, 64, 0, NULL);
151
152 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
153 BasicType t = (BasicType)i;
154 if (type2name(t) != NULL && t != T_OBJECT && t != T_ARRAY &&
155 t != T_VALUETYPE && t != T_NARROWOOP && t != T_NARROWKLASS) {
156 ciType::_basic_types[t] = new (_arena) ciType(t);
157 init_ident_of(ciType::_basic_types[t]);
158 }
159 }
160
161 ciEnv::_null_object_instance = new (_arena) ciNullObject();
162 init_ident_of(ciEnv::_null_object_instance);
163
164 #define WK_KLASS_DEFN(name, ignore_s) \
165 if (SystemDictionary::name##_is_loaded()) \
166 ciEnv::_##name = get_metadata(SystemDictionary::name())->as_instance_klass();
167
168 WK_KLASSES_DO(WK_KLASS_DEFN)
169 #undef WK_KLASS_DEFN
170
171 for (int len = -1; len != _ci_metadata->length(); ) {
172 len = _ci_metadata->length();
173 for (int i2 = 0; i2 < len; i2++) {
174 ciMetadata* obj = _ci_metadata->at(i2);
175 assert (obj->is_metadata(), "what else would it be?");
176 if (obj->is_loaded() && obj->is_instance_klass()) {
177 obj->as_instance_klass()->compute_nonstatic_fields();
178 }
179 }
180 }
181
182 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol());
183 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents
184 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, NULL, NULL);
185 init_ident_of(ciEnv::_unloaded_ciinstance_klass);
186 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
187 init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
188 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
189
190 get_metadata(Universe::boolArrayKlassObj());
191 get_metadata(Universe::charArrayKlassObj());
192 get_metadata(Universe::floatArrayKlassObj());
193 get_metadata(Universe::doubleArrayKlassObj());
194 get_metadata(Universe::byteArrayKlassObj());
195 get_metadata(Universe::shortArrayKlassObj());
196 get_metadata(Universe::intArrayKlassObj());
197 get_metadata(Universe::longArrayKlassObj());
198
199
200
201 assert(_non_perm_count == 0, "no shared non-perm objects");
202
203 // The shared_ident_limit is the first ident number that will
204 // be used for non-shared objects. That is, numbers less than
205 // this limit are permanently assigned to shared CI objects,
206 // while the higher numbers are recycled afresh by each new ciEnv.
207
208 _shared_ident_limit = _next_ident;
209 _shared_ci_metadata = _ci_metadata;
210 }
211
212
213 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) {
214 vmSymbols::SID sid = vmSymbols::find_sid(key);
215 if (sid != vmSymbols::NO_SID) {
216 // do not pollute the main cache with it
217 return vm_symbol_at(sid);
218 }
219
220 assert(vmSymbols::find_sid(key) == vmSymbols::NO_SID, "");
221 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbols::NO_SID);
222 _symbols->push(s);
223 return s;
224 }
225
226 // Decrement the refcount when done on symbols referenced by this compilation.
227 void ciObjectFactory::remove_symbols() {
228 for (int i = 0; i < _symbols->length(); i++) {
229 ciSymbol* s = _symbols->at(i);
230 s->get_symbol()->decrement_refcount();
231 }
232 // Since _symbols is resource allocated we're not allowed to delete it
233 // but it'll go away just the same.
234 }
235
236 // ------------------------------------------------------------------
237 // ciObjectFactory::get
238 //
239 // Get the ciObject corresponding to some oop. If the ciObject has
240 // already been created, it is returned. Otherwise, a new ciObject
241 // is created.
242 ciObject* ciObjectFactory::get(oop key) {
243 ASSERT_IN_VM;
244
245 assert(Universe::heap()->is_in_reserved(key), "must be");
246
247 NonPermObject* &bucket = find_non_perm(key);
248 if (bucket != NULL) {
249 return bucket->object();
250 }
251
252 // The ciObject does not yet exist. Create it and insert it
253 // into the cache.
254 Handle keyHandle(Thread::current(), key);
255 ciObject* new_object = create_new_object(keyHandle());
256 assert(oopDesc::equals(keyHandle(), new_object->get_oop()), "must be properly recorded");
257 init_ident_of(new_object);
258 assert(Universe::heap()->is_in_reserved(new_object->get_oop()), "must be");
259
260 // Not a perm-space object.
261 insert_non_perm(bucket, keyHandle(), new_object);
262 return new_object;
263 }
264
265 int ciObjectFactory::metadata_compare(Metadata* const& key, ciMetadata* const& elt) {
266 Metadata* value = elt->constant_encoding();
267 if (key < value) return -1;
268 else if (key > value) return 1;
269 else return 0;
270 }
271
272 // ------------------------------------------------------------------
273 // ciObjectFactory::cached_metadata
274 //
275 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
276 // already been created, it is returned. Otherwise, null is returned.
277 ciMetadata* ciObjectFactory::cached_metadata(Metadata* key) {
278 ASSERT_IN_VM;
279
280 bool found = false;
281 int index = _ci_metadata->find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
282
283 if (!found) {
284 return NULL;
285 }
286 return _ci_metadata->at(index)->as_metadata();
287 }
288
289
290 // ------------------------------------------------------------------
291 // ciObjectFactory::get_metadata
292 //
293 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
294 // already been created, it is returned. Otherwise, a new ciMetadata
295 // is created.
296 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
297 ASSERT_IN_VM;
298
299 #ifdef ASSERT
300 if (CIObjectFactoryVerify) {
301 Metadata* last = NULL;
302 for (int j = 0; j< _ci_metadata->length(); j++) {
303 Metadata* o = _ci_metadata->at(j)->constant_encoding();
304 assert(last < o, "out of order");
305 last = o;
306 }
307 }
308 #endif // ASSERT
309 int len = _ci_metadata->length();
310 bool found = false;
311 int index = _ci_metadata->find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
312 #ifdef ASSERT
313 if (CIObjectFactoryVerify) {
314 for (int i=0; i<_ci_metadata->length(); i++) {
315 if (_ci_metadata->at(i)->constant_encoding() == key) {
316 assert(index == i, " bad lookup");
317 }
318 }
319 }
320 #endif
321
322 if (!found) {
323 // The ciMetadata does not yet exist. Create it and insert it
324 // into the cache.
325 ciMetadata* new_object = create_new_metadata(key);
326 init_ident_of(new_object);
327 assert(new_object->is_metadata(), "must be");
328
329 if (len != _ci_metadata->length()) {
330 // creating the new object has recursively entered new objects
331 // into the table. We need to recompute our index.
332 index = _ci_metadata->find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
333 }
334 assert(!found, "no double insert");
335 _ci_metadata->insert_before(index, new_object);
336 return new_object;
337 }
338 return _ci_metadata->at(index)->as_metadata();
339 }
340
341 // ------------------------------------------------------------------
342 // ciObjectFactory::create_new_object
343 //
344 // Create a new ciObject from an oop.
345 //
346 // Implementation note: this functionality could be virtual behavior
347 // of the oop itself. For now, we explicitly marshal the object.
348 ciObject* ciObjectFactory::create_new_object(oop o) {
349 EXCEPTION_CONTEXT;
350
351 if (o->is_instance()) {
352 instanceHandle h_i(THREAD, (instanceOop)o);
353 if (java_lang_invoke_CallSite::is_instance(o))
354 return new (arena()) ciCallSite(h_i);
355 else if (java_lang_invoke_MemberName::is_instance(o))
356 return new (arena()) ciMemberName(h_i);
357 else if (java_lang_invoke_MethodHandle::is_instance(o))
358 return new (arena()) ciMethodHandle(h_i);
359 else if (java_lang_invoke_MethodType::is_instance(o))
360 return new (arena()) ciMethodType(h_i);
361 else
362 return new (arena()) ciInstance(h_i);
363 } else if (o->is_objArray()) {
364 objArrayHandle h_oa(THREAD, (objArrayOop)o);
365 return new (arena()) ciObjArray(h_oa);
366 } else if (o->is_typeArray()) {
367 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
368 return new (arena()) ciTypeArray(h_ta);
369 } else if (o->is_valueArray()) {
370 valueArrayHandle h_ta(THREAD, (valueArrayOop)o);
371 return new (arena()) ciValueArray(h_ta);
372 }
373
374 // The oop is of some type not supported by the compiler interface.
375 ShouldNotReachHere();
376 return NULL;
377 }
378
379 // ------------------------------------------------------------------
380 // ciObjectFactory::create_new_metadata
381 //
382 // Create a new ciMetadata from a Metadata*.
383 //
384 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
385 // is used, which points to it's holder.
386 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
387 EXCEPTION_CONTEXT;
388
389 if (o->is_klass()) {
390 Klass* k = (Klass*)o;
391 if (k->is_value()) {
392 return new (arena()) ciValueKlass(k);
393 } else if (k->is_instance_klass()) {
394 return new (arena()) ciInstanceKlass(k);
395 } else if (k->is_valueArray_klass()) {
396 return new (arena()) ciValueArrayKlass(k);
397 } else if (k->is_objArray_klass()) {
398 return new (arena()) ciObjArrayKlass(k);
399 } else if (k->is_typeArray_klass()) {
400 return new (arena()) ciTypeArrayKlass(k);
401 }
402 } else if (o->is_method()) {
403 methodHandle h_m(THREAD, (Method*)o);
404 ciEnv *env = CURRENT_THREAD_ENV;
405 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
406 return new (arena()) ciMethod(h_m, holder);
407 } else if (o->is_methodData()) {
408 // Hold methodHandle alive - might not be necessary ???
409 methodHandle h_m(THREAD, ((MethodData*)o)->method());
410 return new (arena()) ciMethodData((MethodData*)o);
411 }
412
413 // The Metadata* is of some type not supported by the compiler interface.
414 ShouldNotReachHere();
415 return NULL;
416 }
417
418 //------------------------------------------------------------------
419 // ciObjectFactory::get_unloaded_method
420 //
421 // Get the ciMethod representing an unloaded/unfound method.
422 //
423 // Implementation note: unloaded methods are currently stored in
424 // an unordered array, requiring a linear-time lookup for each
425 // unloaded method. This may need to change.
426 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
427 ciSymbol* name,
428 ciSymbol* signature,
429 ciInstanceKlass* accessor) {
430 ciSignature* that = NULL;
431 for (int i = 0; i < _unloaded_methods->length(); i++) {
432 ciMethod* entry = _unloaded_methods->at(i);
433 if (entry->holder()->equals(holder) &&
434 entry->name()->equals(name) &&
435 entry->signature()->as_symbol()->equals(signature)) {
436 // Short-circuit slow resolve.
437 if (entry->signature()->accessing_klass() == accessor) {
438 // We've found a match.
439 return entry;
440 } else {
441 // Lazily create ciSignature
442 if (that == NULL) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
443 if (entry->signature()->equals(that)) {
444 // We've found a match.
445 return entry;
446 }
447 }
448 }
449 }
450
451 // This is a new unloaded method. Create it and stick it in
452 // the cache.
453 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
454
455 init_ident_of(new_method);
456 _unloaded_methods->append(new_method);
457
458 return new_method;
459 }
460
461 //------------------------------------------------------------------
462 // ciObjectFactory::get_unloaded_klass
463 //
464 // Get a ciKlass representing an unloaded klass.
465 //
466 // Implementation note: unloaded klasses are currently stored in
467 // an unordered array, requiring a linear-time lookup for each
468 // unloaded klass. This may need to change.
469 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
470 ciSymbol* name,
471 bool create_if_not_found) {
472 EXCEPTION_CONTEXT;
473 oop loader = NULL;
474 oop domain = NULL;
475 if (accessing_klass != NULL) {
476 loader = accessing_klass->loader();
477 domain = accessing_klass->protection_domain();
478 }
479 for (int i=0; i<_unloaded_klasses->length(); i++) {
480 ciKlass* entry = _unloaded_klasses->at(i);
481 if (entry->name()->equals(name) &&
482 oopDesc::equals(entry->loader(), loader) &&
483 oopDesc::equals(entry->protection_domain(), domain)) {
484 // We've found a match.
485 return entry;
486 }
487 }
488
489 if (!create_if_not_found)
490 return NULL;
491
492 // This is a new unloaded klass. Create it and stick it in
493 // the cache.
494 ciKlass* new_klass = NULL;
495
496 // Two cases: this is an unloaded ObjArrayKlass or an
497 // unloaded InstanceKlass. Deal with both.
498 if (name->char_at(0) == '[') {
499 // Decompose the name.'
500 FieldArrayInfo fd;
501 BasicType element_type = FieldType::get_array_info(name->get_symbol(),
502 fd, THREAD);
503 if (HAS_PENDING_EXCEPTION) {
504 CLEAR_PENDING_EXCEPTION;
505 CURRENT_THREAD_ENV->record_out_of_memory_failure();
506 return ciEnv::_unloaded_ciobjarrayklass;
507 }
508 int dimension = fd.dimension();
509 assert(element_type != T_ARRAY, "unsuccessful decomposition");
510 ciKlass* element_klass = NULL;
511 if (element_type == T_OBJECT || element_type == T_VALUETYPE) {
512 ciEnv *env = CURRENT_THREAD_ENV;
513 ciSymbol* ci_name = env->get_symbol(fd.object_key());
514 element_klass =
515 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
516 } else {
517 assert(dimension > 1, "one dimensional type arrays are always loaded.");
518
519 // The type array itself takes care of one of the dimensions.
520 dimension--;
521
522 // The element klass is a TypeArrayKlass.
523 element_klass = ciTypeArrayKlass::make(element_type);
524 }
525 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
526 } else {
527 jobject loader_handle = NULL;
528 jobject domain_handle = NULL;
529 if (accessing_klass != NULL) {
530 loader_handle = accessing_klass->loader_handle();
531 domain_handle = accessing_klass->protection_domain_handle();
532 }
533 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle);
534 }
535 init_ident_of(new_klass);
536 _unloaded_klasses->append(new_klass);
537
538 return new_klass;
539 }
540
541
542 //------------------------------------------------------------------
543 // ciObjectFactory::get_unloaded_instance
544 //
545 // Get a ciInstance representing an as-yet undetermined instance of a given class.
546 //
547 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
548 for (int i=0; i<_unloaded_instances->length(); i++) {
549 ciInstance* entry = _unloaded_instances->at(i);
550 if (entry->klass()->equals(instance_klass)) {
551 // We've found a match.
552 return entry;
553 }
554 }
555
556 // This is a new unloaded instance. Create it and stick it in
557 // the cache.
558 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
559
560 init_ident_of(new_instance);
561 _unloaded_instances->append(new_instance);
562
563 // make sure it looks the way we want:
564 assert(!new_instance->is_loaded(), "");
565 assert(new_instance->klass() == instance_klass, "");
566
567 return new_instance;
568 }
569
570
571 //------------------------------------------------------------------
572 // ciObjectFactory::get_unloaded_klass_mirror
573 //
574 // Get a ciInstance representing an unresolved klass mirror.
575 //
576 // Currently, this ignores the parameters and returns a unique unloaded instance.
577 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
578 assert(ciEnv::_Class_klass != NULL, "");
579 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
580 }
581
582 //------------------------------------------------------------------
583 // ciObjectFactory::get_unloaded_method_handle_constant
584 //
585 // Get a ciInstance representing an unresolved method handle constant.
586 //
587 // Currently, this ignores the parameters and returns a unique unloaded instance.
588 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
589 ciSymbol* name,
590 ciSymbol* signature,
591 int ref_kind) {
592 if (ciEnv::_MethodHandle_klass == NULL) return NULL;
593 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
594 }
595
596 //------------------------------------------------------------------
597 // ciObjectFactory::get_unloaded_method_type_constant
598 //
599 // Get a ciInstance representing an unresolved method type constant.
600 //
601 // Currently, this ignores the parameters and returns a unique unloaded instance.
602 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
603 if (ciEnv::_MethodType_klass == NULL) return NULL;
604 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
605 }
606
607 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
608 if (ciEnv::_Object_klass == NULL) return NULL;
609 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
610 }
611
612 //------------------------------------------------------------------
613 // ciObjectFactory::get_empty_methodData
614 //
615 // Get the ciMethodData representing the methodData for a method with
616 // none.
617 ciMethodData* ciObjectFactory::get_empty_methodData() {
618 ciMethodData* new_methodData = new (arena()) ciMethodData();
619 init_ident_of(new_methodData);
620 return new_methodData;
621 }
622
623 //------------------------------------------------------------------
624 // ciObjectFactory::get_return_address
625 //
626 // Get a ciReturnAddress for a specified bci.
627 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
628 for (int i=0; i<_return_addresses->length(); i++) {
629 ciReturnAddress* entry = _return_addresses->at(i);
630 if (entry->bci() == bci) {
631 // We've found a match.
632 return entry;
633 }
634 }
635
636 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
637 init_ident_of(new_ret_addr);
638 _return_addresses->append(new_ret_addr);
639 return new_ret_addr;
640 }
641
642 ciWrapper* ciObjectFactory::make_never_null_wrapper(ciType* type) {
643 ciWrapper* wrapper = new (arena()) ciWrapper(type, /* never_null */ true);
644 init_ident_of(wrapper);
645 return wrapper;
646 }
647
648 // ------------------------------------------------------------------
649 // ciObjectFactory::init_ident_of
650 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
651 obj->set_ident(_next_ident++);
652 }
653
654 static ciObjectFactory::NonPermObject* emptyBucket = NULL;
655
656 // ------------------------------------------------------------------
657 // ciObjectFactory::find_non_perm
658 //
659 // Use a small hash table, hashed on the klass of the key.
660 // If there is no entry in the cache corresponding to this oop, return
661 // the null tail of the bucket into which the oop should be inserted.
662 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
663 assert(Universe::heap()->is_in_reserved(key), "must be");
664 ciMetadata* klass = get_metadata(key->klass());
665 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
666 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) {
667 if (is_equal(p, key)) break;
668 }
669 return (*bp);
670 }
671
672
673
674 // ------------------------------------------------------------------
675 // Code for for NonPermObject
676 //
677 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
678 assert(ciObjectFactory::is_initialized(), "");
679 _object = object;
680 _next = bucket;
681 bucket = this;
682 }
683
684
685
686 // ------------------------------------------------------------------
687 // ciObjectFactory::insert_non_perm
688 //
689 // Insert a ciObject into the non-perm table.
690 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
691 assert(Universe::heap()->is_in_reserved_or_null(key), "must be");
692 assert(&where != &emptyBucket, "must not try to fill empty bucket");
693 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
694 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
695 assert(find_non_perm(key) == p, "must find the same spot");
696 ++_non_perm_count;
697 }
698
699 // ------------------------------------------------------------------
700 // ciObjectFactory::vm_symbol_at
701 // Get the ciSymbol corresponding to some index in vmSymbols.
702 ciSymbol* ciObjectFactory::vm_symbol_at(int index) {
703 assert(index >= vmSymbols::FIRST_SID && index < vmSymbols::SID_LIMIT, "oob");
704 return _shared_ci_symbols[index];
705 }
706
707 // ------------------------------------------------------------------
708 // ciObjectFactory::metadata_do
709 void ciObjectFactory::metadata_do(void f(Metadata*)) {
710 if (_ci_metadata == NULL) return;
711 for (int j = 0; j< _ci_metadata->length(); j++) {
712 Metadata* o = _ci_metadata->at(j)->constant_encoding();
713 f(o);
714 }
715 }
716
717 // ------------------------------------------------------------------
718 // ciObjectFactory::print_contents_impl
719 void ciObjectFactory::print_contents_impl() {
720 int len = _ci_metadata->length();
721 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
722 for (int i=0; i<len; i++) {
723 _ci_metadata->at(i)->print();
724 tty->cr();
725 }
726 }
727
728 // ------------------------------------------------------------------
729 // ciObjectFactory::print_contents
730 void ciObjectFactory::print_contents() {
731 print();
732 tty->cr();
733 GUARDED_VM_ENTRY(print_contents_impl();)
734 }
735
736 // ------------------------------------------------------------------
737 // ciObjectFactory::print
738 //
739 // Print debugging information about the object factory
740 void ciObjectFactory::print() {
741 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
742 _non_perm_count, _ci_metadata->length(), _unloaded_methods->length(),
743 _unloaded_instances->length(),
744 _unloaded_klasses->length());
745 }