1 /*
2 * Copyright (c) 1999, 2012, 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/systemDictionary.hpp"
44 #include "gc_interface/collectedHeap.inline.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "oops/oop.inline2.hpp"
48 #include "runtime/fieldType.hpp"
49
50 // ciObjectFactory
51 //
52 // This class handles requests for the creation of new instances
53 // of ciObject and its subclasses. It contains a caching mechanism
54 // which ensures that for each oop, at most one ciObject is created.
55 // This invariant allows more efficient implementation of ciObject.
56 //
57 // Implementation note: the oop->ciObject mapping is represented as
58 // a table stored in an array. Even though objects are moved
59 // by the garbage collector, the compactor preserves their relative
60 // order; address comparison of oops (in perm space) is safe so long
61 // as we prohibit GC during our comparisons. We currently use binary
62 // search to find the oop in the table, and inserting a new oop
63 // into the table may be costly. If this cost ends up being
64 // problematic the underlying data structure can be switched to some
65 // sort of balanced binary tree.
66
67 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL;
68 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::SID_LIMIT];
69 int ciObjectFactory::_shared_ident_limit = 0;
70 volatile bool ciObjectFactory::_initialized = false;
71
72
73 // ------------------------------------------------------------------
74 // ciObjectFactory::ciObjectFactory
75 ciObjectFactory::ciObjectFactory(Arena* arena,
76 int expected_size) {
77
78 for (int i = 0; i < NON_PERM_BUCKETS; i++) {
79 _non_perm_bucket[i] = NULL;
80 }
81 _non_perm_count = 0;
82
83 _next_ident = _shared_ident_limit;
84 _arena = arena;
85 _ci_metadata = new (arena) GrowableArray<ciMetadata*>(arena, expected_size, 0, NULL);
86
87 // If the shared ci objects exist append them to this factory's objects
88
89 if (_shared_ci_metadata != NULL) {
90 _ci_metadata->appendAll(_shared_ci_metadata);
91 }
92
93 _unloaded_methods = new (arena) GrowableArray<ciMethod*>(arena, 4, 0, NULL);
94 _unloaded_klasses = new (arena) GrowableArray<ciKlass*>(arena, 8, 0, NULL);
95 _unloaded_instances = new (arena) GrowableArray<ciInstance*>(arena, 4, 0, NULL);
96 _return_addresses =
97 new (arena) GrowableArray<ciReturnAddress*>(arena, 8, 0, NULL);
98
99 _symbols = new (arena) GrowableArray<ciSymbol*>(arena, 100, 0, NULL);
100 }
101
102 // ------------------------------------------------------------------
103 // ciObjectFactory::ciObjectFactory
104 void ciObjectFactory::initialize() {
105 ASSERT_IN_VM;
106 JavaThread* thread = JavaThread::current();
107 HandleMark handle_mark(thread);
108
109 // This Arena is long lived and exists in the resource mark of the
110 // compiler thread that initializes the initial ciObjectFactory which
111 // creates the shared ciObjects that all later ciObjectFactories use.
112 Arena* arena = new (mtCompiler) Arena();
113 ciEnv initial(arena);
114 ciEnv* env = ciEnv::current();
115 env->_factory->init_shared_objects();
116
117 _initialized = true;
118
119 }
120
121 void ciObjectFactory::init_shared_objects() {
122
123 _next_ident = 1; // start numbering CI objects at 1
124
125 {
126 // Create the shared symbols, but not in _shared_ci_metadata.
127 int i;
128 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
129 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i);
130 assert(vmSymbols::find_sid(vmsym) == i, "1-1 mapping");
131 ciSymbol* sym = new (_arena) ciSymbol(vmsym, (vmSymbols::SID) i);
132 init_ident_of(sym);
133 _shared_ci_symbols[i] = sym;
134 }
135 #ifdef ASSERT
136 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
137 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i);
138 ciSymbol* sym = vm_symbol_at((vmSymbols::SID) i);
139 assert(sym->get_symbol() == vmsym, "oop must match");
140 }
141 assert(ciSymbol::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
142 #endif
143 }
144
145 _ci_metadata = new (_arena) GrowableArray<ciMetadata*>(_arena, 64, 0, NULL);
146
147 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
148 BasicType t = (BasicType)i;
149 if (type2name(t) != NULL && t != T_OBJECT && t != T_ARRAY && t != T_NARROWOOP && t != T_NARROWKLASS) {
150 ciType::_basic_types[t] = new (_arena) ciType(t);
151 init_ident_of(ciType::_basic_types[t]);
152 }
153 }
154
155 ciEnv::_null_object_instance = new (_arena) ciNullObject();
156 init_ident_of(ciEnv::_null_object_instance);
157
158 #define WK_KLASS_DEFN(name, ignore_s, opt) \
159 if (SystemDictionary::name() != NULL) \
160 ciEnv::_##name = get_metadata(SystemDictionary::name())->as_instance_klass();
161
162 WK_KLASSES_DO(WK_KLASS_DEFN)
163 #undef WK_KLASS_DEFN
164
165 for (int len = -1; len != _ci_metadata->length(); ) {
166 len = _ci_metadata->length();
167 for (int i2 = 0; i2 < len; i2++) {
168 ciMetadata* obj = _ci_metadata->at(i2);
169 assert (obj->is_metadata(), "what else would it be?");
170 if (obj->is_loaded() && obj->is_instance_klass()) {
171 obj->as_instance_klass()->compute_nonstatic_fields();
172 }
173 }
174 }
175
176 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol());
177 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents
178 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, NULL, NULL);
179 init_ident_of(ciEnv::_unloaded_ciinstance_klass);
180 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
181 init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
182 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
183
184 get_metadata(Universe::boolArrayKlassObj());
185 get_metadata(Universe::charArrayKlassObj());
186 get_metadata(Universe::singleArrayKlassObj());
187 get_metadata(Universe::doubleArrayKlassObj());
188 get_metadata(Universe::byteArrayKlassObj());
189 get_metadata(Universe::shortArrayKlassObj());
190 get_metadata(Universe::intArrayKlassObj());
191 get_metadata(Universe::longArrayKlassObj());
192
193
194
195 assert(_non_perm_count == 0, "no shared non-perm objects");
196
197 // The shared_ident_limit is the first ident number that will
198 // be used for non-shared objects. That is, numbers less than
199 // this limit are permanently assigned to shared CI objects,
200 // while the higher numbers are recycled afresh by each new ciEnv.
201
202 _shared_ident_limit = _next_ident;
203 _shared_ci_metadata = _ci_metadata;
204 }
205
206
207 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) {
208 vmSymbols::SID sid = vmSymbols::find_sid(key);
209 if (sid != vmSymbols::NO_SID) {
210 // do not pollute the main cache with it
211 return vm_symbol_at(sid);
212 }
213
214 assert(vmSymbols::find_sid(key) == vmSymbols::NO_SID, "");
215 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbols::NO_SID);
216 _symbols->push(s);
217 return s;
218 }
219
220 // Decrement the refcount when done on symbols referenced by this compilation.
221 void ciObjectFactory::remove_symbols() {
222 for (int i = 0; i < _symbols->length(); i++) {
223 ciSymbol* s = _symbols->at(i);
224 s->get_symbol()->decrement_refcount();
225 }
226 // Since _symbols is resource allocated we're not allowed to delete it
227 // but it'll go away just the same.
228 }
229
230 // ------------------------------------------------------------------
231 // ciObjectFactory::get
232 //
233 // Get the ciObject corresponding to some oop. If the ciObject has
234 // already been created, it is returned. Otherwise, a new ciObject
235 // is created.
236 ciObject* ciObjectFactory::get(oop key) {
237 ASSERT_IN_VM;
238
239 assert(key == NULL || Universe::heap()->is_in_reserved(key), "must be");
240
241 NonPermObject* &bucket = find_non_perm(key);
242 if (bucket != NULL) {
243 return bucket->object();
244 }
245
246 // The ciObject does not yet exist. Create it and insert it
247 // into the cache.
248 Handle keyHandle(key);
249 ciObject* new_object = create_new_object(keyHandle());
250 assert(keyHandle() == new_object->get_oop(), "must be properly recorded");
251 init_ident_of(new_object);
252 assert(Universe::heap()->is_in_reserved(new_object->get_oop()), "must be");
253
254 // Not a perm-space object.
255 insert_non_perm(bucket, keyHandle(), new_object);
256 return new_object;
257 }
258
259 // ------------------------------------------------------------------
260 // ciObjectFactory::get
261 //
262 // Get the ciObject corresponding to some oop. If the ciObject has
263 // already been created, it is returned. Otherwise, a new ciObject
264 // is created.
265 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
266 ASSERT_IN_VM;
267
268 #ifdef ASSERT
269 if (CIObjectFactoryVerify) {
270 Metadata* last = NULL;
271 for (int j = 0; j< _ci_metadata->length(); j++) {
272 Metadata* o = _ci_metadata->at(j)->constant_encoding();
273 assert(last < o, "out of order");
274 last = o;
275 }
276 }
277 #endif // ASSERT
278 int len = _ci_metadata->length();
279 int index = find(key, _ci_metadata);
280 #ifdef ASSERT
281 if (CIObjectFactoryVerify) {
282 for (int i=0; i<_ci_metadata->length(); i++) {
283 if (_ci_metadata->at(i)->constant_encoding() == key) {
284 assert(index == i, " bad lookup");
285 }
286 }
287 }
288 #endif
289 if (!is_found_at(index, key, _ci_metadata)) {
290 // The ciObject does not yet exist. Create it and insert it
291 // into the cache.
292 ciMetadata* new_object = create_new_object(key);
293 init_ident_of(new_object);
294 assert(new_object->is_metadata(), "must be");
295
296 if (len != _ci_metadata->length()) {
297 // creating the new object has recursively entered new objects
298 // into the table. We need to recompute our index.
299 index = find(key, _ci_metadata);
300 }
301 assert(!is_found_at(index, key, _ci_metadata), "no double insert");
302 insert(index, new_object, _ci_metadata);
303 return new_object;
304 }
305 return _ci_metadata->at(index)->as_metadata();
306 }
307
308 // ------------------------------------------------------------------
309 // ciObjectFactory::create_new_object
310 //
311 // Create a new ciObject from an oop.
312 //
313 // Implementation note: this functionality could be virtual behavior
314 // of the oop itself. For now, we explicitly marshal the object.
315 ciObject* ciObjectFactory::create_new_object(oop o) {
316 EXCEPTION_CONTEXT;
317
318 if (o->is_instance()) {
319 instanceHandle h_i(THREAD, (instanceOop)o);
320 if (java_lang_invoke_CallSite::is_instance(o))
321 return new (arena()) ciCallSite(h_i);
322 else if (java_lang_invoke_MemberName::is_instance(o))
323 return new (arena()) ciMemberName(h_i);
324 else if (java_lang_invoke_MethodHandle::is_instance(o))
325 return new (arena()) ciMethodHandle(h_i);
326 else if (java_lang_invoke_MethodType::is_instance(o))
327 return new (arena()) ciMethodType(h_i);
328 else
329 return new (arena()) ciInstance(h_i);
330 } else if (o->is_objArray()) {
331 objArrayHandle h_oa(THREAD, (objArrayOop)o);
332 return new (arena()) ciObjArray(h_oa);
333 } else if (o->is_typeArray()) {
334 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
335 return new (arena()) ciTypeArray(h_ta);
336 }
337
338 // The oop is of some type not supported by the compiler interface.
339 ShouldNotReachHere();
340 return NULL;
341 }
342
343 // ------------------------------------------------------------------
344 // ciObjectFactory::create_new_object
345 //
346 // Create a new ciObject from a Metadata*.
347 //
348 // Implementation note: this functionality could be virtual behavior
349 // of the oop itself. For now, we explicitly marshal the object.
350 ciMetadata* ciObjectFactory::create_new_object(Metadata* o) {
351 EXCEPTION_CONTEXT;
352
353 if (o->is_klass()) {
354 KlassHandle h_k(THREAD, (Klass*)o);
355 Klass* k = (Klass*)o;
356 if (k->oop_is_instance()) {
357 return new (arena()) ciInstanceKlass(h_k);
358 } else if (k->oop_is_objArray()) {
359 return new (arena()) ciObjArrayKlass(h_k);
360 } else if (k->oop_is_typeArray()) {
361 return new (arena()) ciTypeArrayKlass(h_k);
362 }
363 } else if (o->is_method()) {
364 methodHandle h_m(THREAD, (Method*)o);
365 return new (arena()) ciMethod(h_m);
366 } else if (o->is_methodData()) {
367 // Hold methodHandle alive - might not be necessary ???
368 methodHandle h_m(THREAD, ((MethodData*)o)->method());
369 return new (arena()) ciMethodData((MethodData*)o);
370 }
371
372 // The oop is of some type not supported by the compiler interface.
373 ShouldNotReachHere();
374 return NULL;
375 }
376
377 //------------------------------------------------------------------
378 // ciObjectFactory::get_unloaded_method
379 //
380 // Get the ciMethod representing an unloaded/unfound method.
381 //
382 // Implementation note: unloaded methods are currently stored in
383 // an unordered array, requiring a linear-time lookup for each
384 // unloaded method. This may need to change.
385 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
386 ciSymbol* name,
387 ciSymbol* signature,
388 ciInstanceKlass* accessor) {
389 ciSignature* that = NULL;
390 for (int i = 0; i < _unloaded_methods->length(); i++) {
391 ciMethod* entry = _unloaded_methods->at(i);
392 if (entry->holder()->equals(holder) &&
393 entry->name()->equals(name) &&
394 entry->signature()->as_symbol()->equals(signature)) {
395 // Short-circuit slow resolve.
396 if (entry->signature()->accessing_klass() == accessor) {
397 // We've found a match.
398 return entry;
399 } else {
400 // Lazily create ciSignature
401 if (that == NULL) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
402 if (entry->signature()->equals(that)) {
403 // We've found a match.
404 return entry;
405 }
406 }
407 }
408 }
409
410 // This is a new unloaded method. Create it and stick it in
411 // the cache.
412 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
413
414 init_ident_of(new_method);
415 _unloaded_methods->append(new_method);
416
417 return new_method;
418 }
419
420 //------------------------------------------------------------------
421 // ciObjectFactory::get_unloaded_klass
422 //
423 // Get a ciKlass representing an unloaded klass.
424 //
425 // Implementation note: unloaded klasses are currently stored in
426 // an unordered array, requiring a linear-time lookup for each
427 // unloaded klass. This may need to change.
428 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
429 ciSymbol* name,
430 bool create_if_not_found) {
431 EXCEPTION_CONTEXT;
432 oop loader = NULL;
433 oop domain = NULL;
434 if (accessing_klass != NULL) {
435 loader = accessing_klass->loader();
436 domain = accessing_klass->protection_domain();
437 }
438 for (int i=0; i<_unloaded_klasses->length(); i++) {
439 ciKlass* entry = _unloaded_klasses->at(i);
440 if (entry->name()->equals(name) &&
441 entry->loader() == loader &&
442 entry->protection_domain() == domain) {
443 // We've found a match.
444 return entry;
445 }
446 }
447
448 if (!create_if_not_found)
449 return NULL;
450
451 // This is a new unloaded klass. Create it and stick it in
452 // the cache.
453 ciKlass* new_klass = NULL;
454
455 // Two cases: this is an unloaded ObjArrayKlass or an
456 // unloaded InstanceKlass. Deal with both.
457 if (name->byte_at(0) == '[') {
458 // Decompose the name.'
459 FieldArrayInfo fd;
460 BasicType element_type = FieldType::get_array_info(name->get_symbol(),
461 fd, THREAD);
462 if (HAS_PENDING_EXCEPTION) {
463 CLEAR_PENDING_EXCEPTION;
464 CURRENT_THREAD_ENV->record_out_of_memory_failure();
465 return ciEnv::_unloaded_ciobjarrayklass;
466 }
467 int dimension = fd.dimension();
468 assert(element_type != T_ARRAY, "unsuccessful decomposition");
469 ciKlass* element_klass = NULL;
470 if (element_type == T_OBJECT) {
471 ciEnv *env = CURRENT_THREAD_ENV;
472 ciSymbol* ci_name = env->get_symbol(fd.object_key());
473 element_klass =
474 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
475 } else {
476 assert(dimension > 1, "one dimensional type arrays are always loaded.");
477
478 // The type array itself takes care of one of the dimensions.
479 dimension--;
480
481 // The element klass is a TypeArrayKlass.
482 element_klass = ciTypeArrayKlass::make(element_type);
483 }
484 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
485 } else {
486 jobject loader_handle = NULL;
487 jobject domain_handle = NULL;
488 if (accessing_klass != NULL) {
489 loader_handle = accessing_klass->loader_handle();
490 domain_handle = accessing_klass->protection_domain_handle();
491 }
492 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle);
493 }
494 init_ident_of(new_klass);
495 _unloaded_klasses->append(new_klass);
496
497 return new_klass;
498 }
499
500
501 //------------------------------------------------------------------
502 // ciObjectFactory::get_unloaded_instance
503 //
504 // Get a ciInstance representing an as-yet undetermined instance of a given class.
505 //
506 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
507 for (int i=0; i<_unloaded_instances->length(); i++) {
508 ciInstance* entry = _unloaded_instances->at(i);
509 if (entry->klass()->equals(instance_klass)) {
510 // We've found a match.
511 return entry;
512 }
513 }
514
515 // This is a new unloaded instance. Create it and stick it in
516 // the cache.
517 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
518
519 init_ident_of(new_instance);
520 _unloaded_instances->append(new_instance);
521
522 // make sure it looks the way we want:
523 assert(!new_instance->is_loaded(), "");
524 assert(new_instance->klass() == instance_klass, "");
525
526 return new_instance;
527 }
528
529
530 //------------------------------------------------------------------
531 // ciObjectFactory::get_unloaded_klass_mirror
532 //
533 // Get a ciInstance representing an unresolved klass mirror.
534 //
535 // Currently, this ignores the parameters and returns a unique unloaded instance.
536 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
537 assert(ciEnv::_Class_klass != NULL, "");
538 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
539 }
540
541 //------------------------------------------------------------------
542 // ciObjectFactory::get_unloaded_method_handle_constant
543 //
544 // Get a ciInstance representing an unresolved method handle constant.
545 //
546 // Currently, this ignores the parameters and returns a unique unloaded instance.
547 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
548 ciSymbol* name,
549 ciSymbol* signature,
550 int ref_kind) {
551 if (ciEnv::_MethodHandle_klass == NULL) return NULL;
552 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
553 }
554
555 //------------------------------------------------------------------
556 // ciObjectFactory::get_unloaded_method_type_constant
557 //
558 // Get a ciInstance representing an unresolved method type constant.
559 //
560 // Currently, this ignores the parameters and returns a unique unloaded instance.
561 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
562 if (ciEnv::_MethodType_klass == NULL) return NULL;
563 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
564 }
565
566 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
567 if (ciEnv::_Object_klass == NULL) return NULL;
568 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
569 }
570
571 //------------------------------------------------------------------
572 // ciObjectFactory::get_empty_methodData
573 //
574 // Get the ciMethodData representing the methodData for a method with
575 // none.
576 ciMethodData* ciObjectFactory::get_empty_methodData() {
577 ciMethodData* new_methodData = new (arena()) ciMethodData();
578 init_ident_of(new_methodData);
579 return new_methodData;
580 }
581
582 //------------------------------------------------------------------
583 // ciObjectFactory::get_return_address
584 //
585 // Get a ciReturnAddress for a specified bci.
586 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
587 for (int i=0; i<_return_addresses->length(); i++) {
588 ciReturnAddress* entry = _return_addresses->at(i);
589 if (entry->bci() == bci) {
590 // We've found a match.
591 return entry;
592 }
593 }
594
595 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
596 init_ident_of(new_ret_addr);
597 _return_addresses->append(new_ret_addr);
598 return new_ret_addr;
599 }
600
601 // ------------------------------------------------------------------
602 // ciObjectFactory::init_ident_of
603 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
604 obj->set_ident(_next_ident++);
605 }
606
607 // ------------------------------------------------------------------
608 // ciObjectFactory::find
609 //
610 // Use binary search to find the position of this oop in the cache.
611 // If there is no entry in the cache corresponding to this oop, return
612 // the position at which the oop should be inserted.
613 int ciObjectFactory::find(Metadata* key, GrowableArray<ciMetadata*>* objects) {
614 int min = 0;
615 int max = objects->length()-1;
616
617 // print_contents();
618
619 while (max >= min) {
620 int mid = (max + min) / 2;
621 Metadata* value = objects->at(mid)->constant_encoding();
622 if (value < key) {
623 min = mid + 1;
624 } else if (value > key) {
625 max = mid - 1;
626 } else {
627 return mid;
628 }
629 }
630 return min;
631 }
632
633 // ------------------------------------------------------------------
634 // ciObjectFactory::is_found_at
635 //
636 // Verify that the binary seach found the given key.
637 bool ciObjectFactory::is_found_at(int index, Metadata* key, GrowableArray<ciMetadata*>* objects) {
638 return (index < objects->length() &&
639 objects->at(index)->constant_encoding() == key);
640 }
641
642
643 // ------------------------------------------------------------------
644 // ciObjectFactory::insert
645 //
646 // Insert a ciObject into the table at some index.
647 void ciObjectFactory::insert(int index, ciMetadata* obj, GrowableArray<ciMetadata*>* objects) {
648 int len = objects->length();
649 if (len == index) {
650 objects->append(obj);
651 } else {
652 objects->append(objects->at(len-1));
653 int pos;
654 for (pos = len-2; pos >= index; pos--) {
655 objects->at_put(pos+1,objects->at(pos));
656 }
657 objects->at_put(index, obj);
658 }
659 }
660
661 static ciObjectFactory::NonPermObject* emptyBucket = NULL;
662
663 // ------------------------------------------------------------------
664 // ciObjectFactory::find_non_perm
665 //
666 // Use a small hash table, hashed on the klass of the key.
667 // If there is no entry in the cache corresponding to this oop, return
668 // the null tail of the bucket into which the oop should be inserted.
669 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
670 assert(Universe::heap()->is_in_reserved_or_null(key), "must be");
671 ciMetadata* klass = get_metadata(key->klass());
672 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
673 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) {
674 if (is_equal(p, key)) break;
675 }
676 return (*bp);
677 }
678
679
680
681 // ------------------------------------------------------------------
682 // Code for for NonPermObject
683 //
684 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
685 assert(ciObjectFactory::is_initialized(), "");
686 _object = object;
687 _next = bucket;
688 bucket = this;
689 }
690
691
692
693 // ------------------------------------------------------------------
694 // ciObjectFactory::insert_non_perm
695 //
696 // Insert a ciObject into the non-perm table.
697 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
698 assert(Universe::heap()->is_in_reserved_or_null(key), "must be");
699 assert(&where != &emptyBucket, "must not try to fill empty bucket");
700 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
701 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
702 assert(find_non_perm(key) == p, "must find the same spot");
703 ++_non_perm_count;
704 }
705
706 // ------------------------------------------------------------------
707 // ciObjectFactory::vm_symbol_at
708 // Get the ciSymbol corresponding to some index in vmSymbols.
709 ciSymbol* ciObjectFactory::vm_symbol_at(int index) {
710 assert(index >= vmSymbols::FIRST_SID && index < vmSymbols::SID_LIMIT, "oob");
711 return _shared_ci_symbols[index];
712 }
713
714 // ------------------------------------------------------------------
715 // ciObjectFactory::metadata_do
716 void ciObjectFactory::metadata_do(void f(Metadata*)) {
717 if (_ci_metadata == NULL) return;
718 for (int j = 0; j< _ci_metadata->length(); j++) {
719 Metadata* o = _ci_metadata->at(j)->constant_encoding();
720 f(o);
721 }
722 }
723
724 // ------------------------------------------------------------------
725 // ciObjectFactory::print_contents_impl
726 void ciObjectFactory::print_contents_impl() {
727 int len = _ci_metadata->length();
728 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
729 for (int i=0; i<len; i++) {
730 _ci_metadata->at(i)->print();
731 tty->cr();
732 }
733 }
734
735 // ------------------------------------------------------------------
736 // ciObjectFactory::print_contents
737 void ciObjectFactory::print_contents() {
738 print();
739 tty->cr();
740 GUARDED_VM_ENTRY(print_contents_impl();)
741 }
742
743 // ------------------------------------------------------------------
744 // ciObjectFactory::print
745 //
746 // Print debugging information about the object factory
747 void ciObjectFactory::print() {
748 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
749 _non_perm_count, _ci_metadata->length(), _unloaded_methods->length(),
750 _unloaded_instances->length(),
751 _unloaded_klasses->length());
752 }