1 /*
2 * Copyright (c) 1999, 2010, 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/ciCPCache.hpp"
27 #include "ci/ciCallSite.hpp"
28 #include "ci/ciInstance.hpp"
29 #include "ci/ciInstanceKlass.hpp"
30 #include "ci/ciInstanceKlassKlass.hpp"
31 #include "ci/ciMethod.hpp"
32 #include "ci/ciMethodData.hpp"
33 #include "ci/ciMethodHandle.hpp"
34 #include "ci/ciMethodKlass.hpp"
35 #include "ci/ciNullObject.hpp"
36 #include "ci/ciObjArray.hpp"
37 #include "ci/ciObjArrayKlass.hpp"
38 #include "ci/ciObjArrayKlassKlass.hpp"
39 #include "ci/ciObjectFactory.hpp"
40 #include "ci/ciSymbol.hpp"
41 #include "ci/ciSymbolKlass.hpp"
42 #include "ci/ciTypeArray.hpp"
43 #include "ci/ciTypeArrayKlass.hpp"
44 #include "ci/ciTypeArrayKlassKlass.hpp"
45 #include "ci/ciUtilities.hpp"
46 #include "classfile/systemDictionary.hpp"
47 #include "gc_interface/collectedHeap.inline.hpp"
48 #include "memory/allocation.inline.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "oops/oop.inline2.hpp"
51 #include "runtime/fieldType.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<ciObject*>* ciObjectFactory::_shared_ci_objects = 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_objects = new (arena) GrowableArray<ciObject*>(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_objects != NULL) {
93 _ci_objects->appendAll(_shared_ci_objects);
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
103 // ------------------------------------------------------------------
104 // ciObjectFactory::ciObjectFactory
105 void ciObjectFactory::initialize() {
106 ASSERT_IN_VM;
107 JavaThread* thread = JavaThread::current();
108 HandleMark handle_mark(thread);
109
110 // This Arena is long lived and exists in the resource mark of the
111 // compiler thread that initializes the initial ciObjectFactory which
112 // creates the shared ciObjects that all later ciObjectFactories use.
113 Arena* arena = new Arena();
114 ciEnv initial(arena);
115 ciEnv* env = ciEnv::current();
116 env->_factory->init_shared_objects();
117
118 _initialized = true;
119
120 }
121
122 void ciObjectFactory::init_shared_objects() {
123
124 _next_ident = 1; // start numbering CI objects at 1
125
126 {
127 // Create the shared symbols, but not in _shared_ci_objects.
128 int i;
129 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
130 symbolHandle sym_handle = vmSymbolHandles::symbol_handle_at((vmSymbols::SID) i);
131 assert(vmSymbols::find_sid(sym_handle()) == i, "1-1 mapping");
132 ciSymbol* sym = new (_arena) ciSymbol(sym_handle, (vmSymbols::SID) i);
133 init_ident_of(sym);
134 _shared_ci_symbols[i] = sym;
135 }
136 #ifdef ASSERT
137 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
138 symbolHandle sym_handle = vmSymbolHandles::symbol_handle_at((vmSymbols::SID) i);
139 ciSymbol* sym = vm_symbol_at((vmSymbols::SID) i);
140 assert(sym->get_oop() == sym_handle(), "oop must match");
141 }
142 assert(ciSymbol::void_class_signature()->get_oop() == vmSymbols::void_class_signature(), "spot check");
143 #endif
144 }
145
146 _ci_objects = new (_arena) GrowableArray<ciObject*>(_arena, 64, 0, NULL);
147
148 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
149 BasicType t = (BasicType)i;
150 if (type2name(t) != NULL && t != T_OBJECT && t != T_ARRAY && t != T_NARROWOOP) {
151 ciType::_basic_types[t] = new (_arena) ciType(t);
152 init_ident_of(ciType::_basic_types[t]);
153 }
154 }
155
156 ciEnv::_null_object_instance = new (_arena) ciNullObject();
157 init_ident_of(ciEnv::_null_object_instance);
158 ciEnv::_method_klass_instance =
159 get(Universe::methodKlassObj())->as_method_klass();
160 ciEnv::_symbol_klass_instance =
161 get(Universe::symbolKlassObj())->as_symbol_klass();
162 ciEnv::_klass_klass_instance =
163 get(Universe::klassKlassObj())->as_klass_klass();
164 ciEnv::_instance_klass_klass_instance =
165 get(Universe::instanceKlassKlassObj())
166 ->as_instance_klass_klass();
167 ciEnv::_type_array_klass_klass_instance =
168 get(Universe::typeArrayKlassKlassObj())
169 ->as_type_array_klass_klass();
170 ciEnv::_obj_array_klass_klass_instance =
171 get(Universe::objArrayKlassKlassObj())
172 ->as_obj_array_klass_klass();
173
174 #define WK_KLASS_DEFN(name, ignore_s, opt) \
175 if (SystemDictionary::name() != NULL) \
176 ciEnv::_##name = get(SystemDictionary::name())->as_instance_klass();
177
178 WK_KLASSES_DO(WK_KLASS_DEFN)
179 #undef WK_KLASS_DEFN
180
181 for (int len = -1; len != _ci_objects->length(); ) {
182 len = _ci_objects->length();
183 for (int i2 = 0; i2 < len; i2++) {
184 ciObject* obj = _ci_objects->at(i2);
185 if (obj->is_loaded() && obj->is_instance_klass()) {
186 obj->as_instance_klass()->compute_nonstatic_fields();
187 }
188 }
189 }
190
191 ciEnv::_unloaded_cisymbol = (ciSymbol*) ciObjectFactory::get(vmSymbols::dummy_symbol_oop());
192 // Create dummy instanceKlass and objArrayKlass object and assign them idents
193 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, NULL, NULL);
194 init_ident_of(ciEnv::_unloaded_ciinstance_klass);
195 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
196 init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
197 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
198
199 get(Universe::boolArrayKlassObj());
200 get(Universe::charArrayKlassObj());
201 get(Universe::singleArrayKlassObj());
202 get(Universe::doubleArrayKlassObj());
203 get(Universe::byteArrayKlassObj());
204 get(Universe::shortArrayKlassObj());
205 get(Universe::intArrayKlassObj());
206 get(Universe::longArrayKlassObj());
207
208
209
210 assert(_non_perm_count == 0, "no shared non-perm objects");
211
212 // The shared_ident_limit is the first ident number that will
213 // be used for non-shared objects. That is, numbers less than
214 // this limit are permanently assigned to shared CI objects,
215 // while the higher numbers are recycled afresh by each new ciEnv.
216
217 _shared_ident_limit = _next_ident;
218 _shared_ci_objects = _ci_objects;
219 }
220
221 // ------------------------------------------------------------------
222 // ciObjectFactory::get
223 //
224 // Get the ciObject corresponding to some oop. If the ciObject has
225 // already been created, it is returned. Otherwise, a new ciObject
226 // is created.
227 ciObject* ciObjectFactory::get(oop key) {
228 ASSERT_IN_VM;
229
230 #ifdef ASSERT
231 if (CIObjectFactoryVerify) {
232 oop last = NULL;
233 for (int j = 0; j< _ci_objects->length(); j++) {
234 oop o = _ci_objects->at(j)->get_oop();
235 assert(last < o, "out of order");
236 last = o;
237 }
238 }
239 #endif // ASSERT
240 int len = _ci_objects->length();
241 int index = find(key, _ci_objects);
242 #ifdef ASSERT
243 if (CIObjectFactoryVerify) {
244 for (int i=0; i<_ci_objects->length(); i++) {
245 if (_ci_objects->at(i)->get_oop() == key) {
246 assert(index == i, " bad lookup");
247 }
248 }
249 }
250 #endif
251 if (!is_found_at(index, key, _ci_objects)) {
252 // Check in the non-perm area before putting it in the list.
253 NonPermObject* &bucket = find_non_perm(key);
254 if (bucket != NULL) {
255 return bucket->object();
256 }
257
258 // Check in the shared symbol area before putting it in the list.
259 if (key->is_symbol()) {
260 vmSymbols::SID sid = vmSymbols::find_sid((symbolOop)key);
261 if (sid != vmSymbols::NO_SID) {
262 // do not pollute the main cache with it
263 return vm_symbol_at(sid);
264 }
265 }
266
267 // The ciObject does not yet exist. Create it and insert it
268 // into the cache.
269 Handle keyHandle(key);
270 ciObject* new_object = create_new_object(keyHandle());
271 assert(keyHandle() == new_object->get_oop(), "must be properly recorded");
272 init_ident_of(new_object);
273 if (!new_object->is_perm()) {
274 // Not a perm-space object.
275 insert_non_perm(bucket, keyHandle(), new_object);
276 return new_object;
277 }
278 if (len != _ci_objects->length()) {
279 // creating the new object has recursively entered new objects
280 // into the table. We need to recompute our index.
281 index = find(keyHandle(), _ci_objects);
282 }
283 assert(!is_found_at(index, keyHandle(), _ci_objects), "no double insert");
284 insert(index, new_object, _ci_objects);
285 return new_object;
286 }
287 return _ci_objects->at(index);
288 }
289
290 // ------------------------------------------------------------------
291 // ciObjectFactory::create_new_object
292 //
293 // Create a new ciObject from an oop.
294 //
295 // Implementation note: this functionality could be virtual behavior
296 // of the oop itself. For now, we explicitly marshal the object.
297 ciObject* ciObjectFactory::create_new_object(oop o) {
298 EXCEPTION_CONTEXT;
299
300 if (o->is_symbol()) {
301 symbolHandle h_o(THREAD, (symbolOop)o);
302 assert(vmSymbols::find_sid(h_o()) == vmSymbols::NO_SID, "");
303 return new (arena()) ciSymbol(h_o, vmSymbols::NO_SID);
304 } else if (o->is_klass()) {
305 KlassHandle h_k(THREAD, (klassOop)o);
306 Klass* k = ((klassOop)o)->klass_part();
307 if (k->oop_is_instance()) {
308 return new (arena()) ciInstanceKlass(h_k);
309 } else if (k->oop_is_objArray()) {
310 return new (arena()) ciObjArrayKlass(h_k);
311 } else if (k->oop_is_typeArray()) {
312 return new (arena()) ciTypeArrayKlass(h_k);
313 } else if (k->oop_is_method()) {
314 return new (arena()) ciMethodKlass(h_k);
315 } else if (k->oop_is_symbol()) {
316 return new (arena()) ciSymbolKlass(h_k);
317 } else if (k->oop_is_klass()) {
318 if (k->oop_is_objArrayKlass()) {
319 return new (arena()) ciObjArrayKlassKlass(h_k);
320 } else if (k->oop_is_typeArrayKlass()) {
321 return new (arena()) ciTypeArrayKlassKlass(h_k);
322 } else if (k->oop_is_instanceKlass()) {
323 return new (arena()) ciInstanceKlassKlass(h_k);
324 } else {
325 assert(o == Universe::klassKlassObj(), "bad klassKlass");
326 return new (arena()) ciKlassKlass(h_k);
327 }
328 }
329 } else if (o->is_method()) {
330 methodHandle h_m(THREAD, (methodOop)o);
331 return new (arena()) ciMethod(h_m);
332 } else if (o->is_methodData()) {
333 methodDataHandle h_md(THREAD, (methodDataOop)o);
334 return new (arena()) ciMethodData(h_md);
335 } else if (o->is_instance()) {
336 instanceHandle h_i(THREAD, (instanceOop)o);
337 if (java_dyn_CallSite::is_instance(o))
338 return new (arena()) ciCallSite(h_i);
339 else if (java_dyn_MethodHandle::is_instance(o))
340 return new (arena()) ciMethodHandle(h_i);
341 else
342 return new (arena()) ciInstance(h_i);
343 } else if (o->is_objArray()) {
344 objArrayHandle h_oa(THREAD, (objArrayOop)o);
345 return new (arena()) ciObjArray(h_oa);
346 } else if (o->is_typeArray()) {
347 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
348 return new (arena()) ciTypeArray(h_ta);
349 } else if (o->is_constantPoolCache()) {
350 constantPoolCacheHandle h_cpc(THREAD, (constantPoolCacheOop) o);
351 return new (arena()) ciCPCache(h_cpc);
352 }
353
354 // The oop is of some type not supported by the compiler interface.
355 ShouldNotReachHere();
356 return NULL;
357 }
358
359 //------------------------------------------------------------------
360 // ciObjectFactory::get_unloaded_method
361 //
362 // Get the ciMethod representing an unloaded/unfound method.
363 //
364 // Implementation note: unloaded methods are currently stored in
365 // an unordered array, requiring a linear-time lookup for each
366 // unloaded method. This may need to change.
367 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
368 ciSymbol* name,
369 ciSymbol* signature) {
370 for (int i=0; i<_unloaded_methods->length(); i++) {
371 ciMethod* entry = _unloaded_methods->at(i);
372 if (entry->holder()->equals(holder) &&
373 entry->name()->equals(name) &&
374 entry->signature()->as_symbol()->equals(signature)) {
375 // We've found a match.
376 return entry;
377 }
378 }
379
380 // This is a new unloaded method. Create it and stick it in
381 // the cache.
382 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature);
383
384 init_ident_of(new_method);
385 _unloaded_methods->append(new_method);
386
387 return new_method;
388 }
389
390 //------------------------------------------------------------------
391 // ciObjectFactory::get_unloaded_klass
392 //
393 // Get a ciKlass representing an unloaded klass.
394 //
395 // Implementation note: unloaded klasses are currently stored in
396 // an unordered array, requiring a linear-time lookup for each
397 // unloaded klass. This may need to change.
398 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
399 ciSymbol* name,
400 bool create_if_not_found) {
401 EXCEPTION_CONTEXT;
402 oop loader = NULL;
403 oop domain = NULL;
404 if (accessing_klass != NULL) {
405 loader = accessing_klass->loader();
406 domain = accessing_klass->protection_domain();
407 }
408 for (int i=0; i<_unloaded_klasses->length(); i++) {
409 ciKlass* entry = _unloaded_klasses->at(i);
410 if (entry->name()->equals(name) &&
411 entry->loader() == loader &&
412 entry->protection_domain() == domain) {
413 // We've found a match.
414 return entry;
415 }
416 }
417
418 if (!create_if_not_found)
419 return NULL;
420
421 // This is a new unloaded klass. Create it and stick it in
422 // the cache.
423 ciKlass* new_klass = NULL;
424
425 // Two cases: this is an unloaded objArrayKlass or an
426 // unloaded instanceKlass. Deal with both.
427 if (name->byte_at(0) == '[') {
428 // Decompose the name.'
429 jint dimension = 0;
430 symbolOop element_name = NULL;
431 BasicType element_type= FieldType::get_array_info(name->get_symbolOop(),
432 &dimension,
433 &element_name,
434 THREAD);
435 if (HAS_PENDING_EXCEPTION) {
436 CLEAR_PENDING_EXCEPTION;
437 CURRENT_THREAD_ENV->record_out_of_memory_failure();
438 return ciEnv::_unloaded_ciobjarrayklass;
439 }
440 assert(element_type != T_ARRAY, "unsuccessful decomposition");
441 ciKlass* element_klass = NULL;
442 if (element_type == T_OBJECT) {
443 ciEnv *env = CURRENT_THREAD_ENV;
444 ciSymbol* ci_name = env->get_object(element_name)->as_symbol();
445 element_klass =
446 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
447 } else {
448 assert(dimension > 1, "one dimensional type arrays are always loaded.");
449
450 // The type array itself takes care of one of the dimensions.
451 dimension--;
452
453 // The element klass is a typeArrayKlass.
454 element_klass = ciTypeArrayKlass::make(element_type);
455 }
456 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
457 } else {
458 jobject loader_handle = NULL;
459 jobject domain_handle = NULL;
460 if (accessing_klass != NULL) {
461 loader_handle = accessing_klass->loader_handle();
462 domain_handle = accessing_klass->protection_domain_handle();
463 }
464 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle);
465 }
466 init_ident_of(new_klass);
467 _unloaded_klasses->append(new_klass);
468
469 return new_klass;
470 }
471
472
473 //------------------------------------------------------------------
474 // ciObjectFactory::get_unloaded_instance
475 //
476 // Get a ciInstance representing an as-yet undetermined instance of a given class.
477 //
478 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
479 for (int i=0; i<_unloaded_instances->length(); i++) {
480 ciInstance* entry = _unloaded_instances->at(i);
481 if (entry->klass()->equals(instance_klass)) {
482 // We've found a match.
483 return entry;
484 }
485 }
486
487 // This is a new unloaded instance. Create it and stick it in
488 // the cache.
489 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
490
491 init_ident_of(new_instance);
492 _unloaded_instances->append(new_instance);
493
494 // make sure it looks the way we want:
495 assert(!new_instance->is_loaded(), "");
496 assert(new_instance->klass() == instance_klass, "");
497
498 return new_instance;
499 }
500
501
502 //------------------------------------------------------------------
503 // ciObjectFactory::get_unloaded_klass_mirror
504 //
505 // Get a ciInstance representing an unresolved klass mirror.
506 //
507 // Currently, this ignores the parameters and returns a unique unloaded instance.
508 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
509 assert(ciEnv::_Class_klass != NULL, "");
510 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
511 }
512
513 //------------------------------------------------------------------
514 // ciObjectFactory::get_unloaded_method_handle_constant
515 //
516 // Get a ciInstance representing an unresolved method handle constant.
517 //
518 // Currently, this ignores the parameters and returns a unique unloaded instance.
519 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
520 ciSymbol* name,
521 ciSymbol* signature,
522 int ref_kind) {
523 if (ciEnv::_MethodHandle_klass == NULL) return NULL;
524 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
525 }
526
527 //------------------------------------------------------------------
528 // ciObjectFactory::get_unloaded_method_type_constant
529 //
530 // Get a ciInstance representing an unresolved method type constant.
531 //
532 // Currently, this ignores the parameters and returns a unique unloaded instance.
533 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
534 if (ciEnv::_MethodType_klass == NULL) return NULL;
535 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
536 }
537
538
539
540 //------------------------------------------------------------------
541 // ciObjectFactory::get_empty_methodData
542 //
543 // Get the ciMethodData representing the methodData for a method with
544 // none.
545 ciMethodData* ciObjectFactory::get_empty_methodData() {
546 ciMethodData* new_methodData = new (arena()) ciMethodData();
547 init_ident_of(new_methodData);
548 return new_methodData;
549 }
550
551 //------------------------------------------------------------------
552 // ciObjectFactory::get_return_address
553 //
554 // Get a ciReturnAddress for a specified bci.
555 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
556 for (int i=0; i<_return_addresses->length(); i++) {
557 ciReturnAddress* entry = _return_addresses->at(i);
558 if (entry->bci() == bci) {
559 // We've found a match.
560 return entry;
561 }
562 }
563
564 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
565 init_ident_of(new_ret_addr);
566 _return_addresses->append(new_ret_addr);
567 return new_ret_addr;
568 }
569
570 // ------------------------------------------------------------------
571 // ciObjectFactory::init_ident_of
572 void ciObjectFactory::init_ident_of(ciObject* obj) {
573 obj->set_ident(_next_ident++);
574 }
575
576
577 // ------------------------------------------------------------------
578 // ciObjectFactory::find
579 //
580 // Use binary search to find the position of this oop in the cache.
581 // If there is no entry in the cache corresponding to this oop, return
582 // the position at which the oop should be inserted.
583 int ciObjectFactory::find(oop key, GrowableArray<ciObject*>* objects) {
584 int min = 0;
585 int max = objects->length()-1;
586
587 // print_contents();
588
589 while (max >= min) {
590 int mid = (max + min) / 2;
591 oop value = objects->at(mid)->get_oop();
592 if (value < key) {
593 min = mid + 1;
594 } else if (value > key) {
595 max = mid - 1;
596 } else {
597 return mid;
598 }
599 }
600 return min;
601 }
602
603 // ------------------------------------------------------------------
604 // ciObjectFactory::is_found_at
605 //
606 // Verify that the binary seach found the given key.
607 bool ciObjectFactory::is_found_at(int index, oop key, GrowableArray<ciObject*>* objects) {
608 return (index < objects->length() &&
609 objects->at(index)->get_oop() == key);
610 }
611
612
613 // ------------------------------------------------------------------
614 // ciObjectFactory::insert
615 //
616 // Insert a ciObject into the table at some index.
617 void ciObjectFactory::insert(int index, ciObject* obj, GrowableArray<ciObject*>* objects) {
618 int len = objects->length();
619 if (len == index) {
620 objects->append(obj);
621 } else {
622 objects->append(objects->at(len-1));
623 int pos;
624 for (pos = len-2; pos >= index; pos--) {
625 objects->at_put(pos+1,objects->at(pos));
626 }
627 objects->at_put(index, obj);
628 }
629 #ifdef ASSERT
630 if (CIObjectFactoryVerify) {
631 oop last = NULL;
632 for (int j = 0; j< objects->length(); j++) {
633 oop o = objects->at(j)->get_oop();
634 assert(last < o, "out of order");
635 last = o;
636 }
637 }
638 #endif // ASSERT
639 }
640
641 static ciObjectFactory::NonPermObject* emptyBucket = NULL;
642
643 // ------------------------------------------------------------------
644 // ciObjectFactory::find_non_perm
645 //
646 // Use a small hash table, hashed on the klass of the key.
647 // If there is no entry in the cache corresponding to this oop, return
648 // the null tail of the bucket into which the oop should be inserted.
649 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
650 // Be careful: is_perm might change from false to true.
651 // Thus, there might be a matching perm object in the table.
652 // If there is, this probe must find it.
653 if (key->is_perm() && _non_perm_count == 0) {
654 return emptyBucket;
655 } else if (key->is_instance()) {
656 if (key->klass() == SystemDictionary::Class_klass()) {
657 // class mirror instances are always perm
658 return emptyBucket;
659 }
660 // fall through to probe
661 } else if (key->is_array()) {
662 // fall through to probe
663 } else {
664 // not an array or instance
665 return emptyBucket;
666 }
667
668 ciObject* klass = get(key->klass());
669 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
670 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) {
671 if (is_equal(p, key)) break;
672 }
673 return (*bp);
674 }
675
676
677
678 // ------------------------------------------------------------------
679 // Code for for NonPermObject
680 //
681 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
682 assert(ciObjectFactory::is_initialized(), "");
683 _object = object;
684 _next = bucket;
685 bucket = this;
686 }
687
688
689
690 // ------------------------------------------------------------------
691 // ciObjectFactory::insert_non_perm
692 //
693 // Insert a ciObject into the non-perm table.
694 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
695 assert(&where != &emptyBucket, "must not try to fill empty bucket");
696 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
697 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
698 assert(find_non_perm(key) == p, "must find the same spot");
699 ++_non_perm_count;
700 }
701
702 // ------------------------------------------------------------------
703 // ciObjectFactory::vm_symbol_at
704 // Get the ciSymbol corresponding to some index in vmSymbols.
705 ciSymbol* ciObjectFactory::vm_symbol_at(int index) {
706 assert(index >= vmSymbols::FIRST_SID && index < vmSymbols::SID_LIMIT, "oob");
707 return _shared_ci_symbols[index];
708 }
709
710 // ------------------------------------------------------------------
711 // ciObjectFactory::print_contents_impl
712 void ciObjectFactory::print_contents_impl() {
713 int len = _ci_objects->length();
714 tty->print_cr("ciObjectFactory (%d) oop contents:", len);
715 for (int i=0; i<len; i++) {
716 _ci_objects->at(i)->print();
717 tty->cr();
718 }
719 }
720
721 // ------------------------------------------------------------------
722 // ciObjectFactory::print_contents
723 void ciObjectFactory::print_contents() {
724 print();
725 tty->cr();
726 GUARDED_VM_ENTRY(print_contents_impl();)
727 }
728
729 // ------------------------------------------------------------------
730 // ciObjectFactory::print
731 //
732 // Print debugging information about the object factory
733 void ciObjectFactory::print() {
734 tty->print("<ciObjectFactory oops=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
735 _ci_objects->length(), _unloaded_methods->length(),
736 _unloaded_instances->length(),
737 _unloaded_klasses->length());
738 }