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