1 /*
2 * Copyright (c) 1999, 2015, 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/javaClasses.inline.hpp"
44 #include "classfile/systemDictionary.hpp"
45 #include "gc/shared/collectedHeap.inline.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "runtime/fieldType.hpp"
49 #include "utilities/macros.hpp"
50 #if INCLUDE_ALL_GCS
51 # include "gc/g1/g1SATBCardTableModRefBS.hpp"
52 #endif
53
54 // ciObjectFactory
55 //
56 // This class handles requests for the creation of new instances
57 // of ciObject and its subclasses. It contains a caching mechanism
58 // which ensures that for each oop, at most one ciObject is created.
59 // This invariant allows more efficient implementation of ciObject.
60 //
61 // Implementation note: the oop->ciObject mapping is represented as
62 // a table stored in an array. Even though objects are moved
63 // by the garbage collector, the compactor preserves their relative
64 // order; address comparison of oops (in perm space) is safe so long
65 // as we prohibit GC during our comparisons. We currently use binary
66 // search to find the oop in the table, and inserting a new oop
67 // into the table may be costly. If this cost ends up being
68 // problematic the underlying data structure can be switched to some
69 // sort of balanced binary tree.
70
71 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL;
72 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::SID_LIMIT];
73 int ciObjectFactory::_shared_ident_limit = 0;
74 volatile bool ciObjectFactory::_initialized = false;
75
76
77 // ------------------------------------------------------------------
78 // ciObjectFactory::ciObjectFactory
79 ciObjectFactory::ciObjectFactory(Arena* arena,
80 int expected_size) {
81
82 for (int i = 0; i < NON_PERM_BUCKETS; i++) {
83 _non_perm_bucket[i] = NULL;
84 }
85 _non_perm_count = 0;
86
87 _next_ident = _shared_ident_limit;
88 _arena = arena;
89 _ci_metadata = new (arena) GrowableArray<ciMetadata*>(arena, expected_size, 0, NULL);
90
91 // If the shared ci objects exist append them to this factory's objects
92
93 if (_shared_ci_metadata != NULL) {
94 _ci_metadata->appendAll(_shared_ci_metadata);
95 }
96
97 _unloaded_methods = new (arena) GrowableArray<ciMethod*>(arena, 4, 0, NULL);
98 _unloaded_klasses = new (arena) GrowableArray<ciKlass*>(arena, 8, 0, NULL);
99 _unloaded_instances = new (arena) GrowableArray<ciInstance*>(arena, 4, 0, NULL);
100 _return_addresses =
101 new (arena) GrowableArray<ciReturnAddress*>(arena, 8, 0, NULL);
102
103 _symbols = new (arena) GrowableArray<ciSymbol*>(arena, 100, 0, NULL);
104 }
105
106 // ------------------------------------------------------------------
107 // ciObjectFactory::ciObjectFactory
108 void ciObjectFactory::initialize() {
109 ASSERT_IN_VM;
110 JavaThread* thread = JavaThread::current();
111 HandleMark handle_mark(thread);
112
113 // This Arena is long lived and exists in the resource mark of the
114 // compiler thread that initializes the initial ciObjectFactory which
115 // creates the shared ciObjects that all later ciObjectFactories use.
116 Arena* arena = new (mtCompiler) Arena(mtCompiler);
117 ciEnv initial(arena);
118 ciEnv* env = ciEnv::current();
119 env->_factory->init_shared_objects();
120
121 _initialized = true;
122
123 }
124
125 void ciObjectFactory::init_shared_objects() {
126
127 _next_ident = 1; // start numbering CI objects at 1
128
129 {
130 // Create the shared symbols, but not in _shared_ci_metadata.
131 int i;
132 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
133 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i);
134 assert(vmSymbols::find_sid(vmsym) == i, "1-1 mapping");
135 ciSymbol* sym = new (_arena) ciSymbol(vmsym, (vmSymbols::SID) i);
136 init_ident_of(sym);
137 _shared_ci_symbols[i] = sym;
138 }
139 #ifdef ASSERT
140 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
141 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i);
142 ciSymbol* sym = vm_symbol_at((vmSymbols::SID) i);
143 assert(sym->get_symbol() == vmsym, "oop must match");
144 }
145 assert(ciSymbol::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
146 #endif
147 }
148
149 _ci_metadata = new (_arena) GrowableArray<ciMetadata*>(_arena, 64, 0, NULL);
150
151 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
152 BasicType t = (BasicType)i;
153 if (type2name(t) != NULL && t != T_OBJECT && t != T_ARRAY && t != T_NARROWOOP && t != T_NARROWKLASS) {
154 ciType::_basic_types[t] = new (_arena) ciType(t);
155 init_ident_of(ciType::_basic_types[t]);
156 }
157 }
158
159 ciEnv::_null_object_instance = new (_arena) ciNullObject();
160 init_ident_of(ciEnv::_null_object_instance);
161
162 #define WK_KLASS_DEFN(name, ignore_s, opt) \
163 if (SystemDictionary::name() != NULL) \
164 ciEnv::_##name = get_metadata(SystemDictionary::name())->as_instance_klass();
165
166 WK_KLASSES_DO(WK_KLASS_DEFN)
167 #undef WK_KLASS_DEFN
168
169 for (int len = -1; len != _ci_metadata->length(); ) {
170 len = _ci_metadata->length();
171 for (int i2 = 0; i2 < len; i2++) {
172 ciMetadata* obj = _ci_metadata->at(i2);
173 assert (obj->is_metadata(), "what else would it be?");
174 if (obj->is_loaded() && obj->is_instance_klass()) {
175 obj->as_instance_klass()->compute_nonstatic_fields();
176 }
177 }
178 }
179
180 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol());
181 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents
182 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, NULL, NULL);
183 init_ident_of(ciEnv::_unloaded_ciinstance_klass);
184 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
185 init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
186 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
187
188 get_metadata(Universe::boolArrayKlassObj());
189 get_metadata(Universe::charArrayKlassObj());
190 get_metadata(Universe::singleArrayKlassObj());
191 get_metadata(Universe::doubleArrayKlassObj());
192 get_metadata(Universe::byteArrayKlassObj());
193 get_metadata(Universe::shortArrayKlassObj());
194 get_metadata(Universe::intArrayKlassObj());
195 get_metadata(Universe::longArrayKlassObj());
196
197
198
199 assert(_non_perm_count == 0, "no shared non-perm objects");
200
201 // The shared_ident_limit is the first ident number that will
202 // be used for non-shared objects. That is, numbers less than
203 // this limit are permanently assigned to shared CI objects,
204 // while the higher numbers are recycled afresh by each new ciEnv.
205
206 _shared_ident_limit = _next_ident;
207 _shared_ci_metadata = _ci_metadata;
208 }
209
210
211 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) {
212 vmSymbols::SID sid = vmSymbols::find_sid(key);
213 if (sid != vmSymbols::NO_SID) {
214 // do not pollute the main cache with it
215 return vm_symbol_at(sid);
216 }
217
218 assert(vmSymbols::find_sid(key) == vmSymbols::NO_SID, "");
219 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbols::NO_SID);
220 _symbols->push(s);
221 return s;
222 }
223
224 // Decrement the refcount when done on symbols referenced by this compilation.
225 void ciObjectFactory::remove_symbols() {
226 for (int i = 0; i < _symbols->length(); i++) {
227 ciSymbol* s = _symbols->at(i);
228 s->get_symbol()->decrement_refcount();
229 }
230 // Since _symbols is resource allocated we're not allowed to delete it
231 // but it'll go away just the same.
232 }
233
234 // ------------------------------------------------------------------
235 // ciObjectFactory::get
236 //
237 // Get the ciObject corresponding to some oop. If the ciObject has
238 // already been created, it is returned. Otherwise, a new ciObject
239 // is created.
240 ciObject* ciObjectFactory::get(oop key) {
241 ASSERT_IN_VM;
242
243 assert(Universe::heap()->is_in_reserved(key), "must be");
244
245 NonPermObject* &bucket = find_non_perm(key);
246 if (bucket != NULL) {
247 return bucket->object();
248 }
249
250 // The ciObject does not yet exist. Create it and insert it
251 // into the cache.
252 Handle keyHandle(key);
253 ciObject* new_object = create_new_object(keyHandle());
254 assert(keyHandle() == new_object->get_oop(), "must be properly recorded");
255 init_ident_of(new_object);
256 assert(Universe::heap()->is_in_reserved(new_object->get_oop()), "must be");
257
258 // Not a perm-space object.
259 insert_non_perm(bucket, keyHandle(), new_object);
260 return new_object;
261 }
262
263 // ------------------------------------------------------------------
264 // ciObjectFactory::get_metadata
265 //
266 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
267 // already been created, it is returned. Otherwise, a new ciMetadata
268 // is created.
269 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
270 ASSERT_IN_VM;
271
272 #ifdef ASSERT
273 if (CIObjectFactoryVerify) {
274 Metadata* last = NULL;
275 for (int j = 0; j< _ci_metadata->length(); j++) {
276 Metadata* o = _ci_metadata->at(j)->constant_encoding();
277 assert(last < o, "out of order");
278 last = o;
279 }
280 }
281 #endif // ASSERT
282 int len = _ci_metadata->length();
283 int index = find(key, _ci_metadata);
284 #ifdef ASSERT
285 if (CIObjectFactoryVerify) {
286 for (int i=0; i<_ci_metadata->length(); i++) {
287 if (_ci_metadata->at(i)->constant_encoding() == key) {
288 assert(index == i, " bad lookup");
289 }
290 }
291 }
292 #endif
293 if (!is_found_at(index, key, _ci_metadata)) {
294 // The ciMetadata does not yet exist. Create it and insert it
295 // into the cache.
296 ciMetadata* new_object = create_new_metadata(key);
297 init_ident_of(new_object);
298 assert(new_object->is_metadata(), "must be");
299
300 if (len != _ci_metadata->length()) {
301 // creating the new object has recursively entered new objects
302 // into the table. We need to recompute our index.
303 index = find(key, _ci_metadata);
304 }
305 assert(!is_found_at(index, key, _ci_metadata), "no double insert");
306 insert(index, new_object, _ci_metadata);
307 return new_object;
308 }
309 return _ci_metadata->at(index)->as_metadata();
310 }
311
312 // ------------------------------------------------------------------
313 // ciObjectFactory::create_new_object
314 //
315 // Create a new ciObject from an oop.
316 //
317 // Implementation note: this functionality could be virtual behavior
318 // of the oop itself. For now, we explicitly marshal the object.
319 ciObject* ciObjectFactory::create_new_object(oop o) {
320 EXCEPTION_CONTEXT;
321
322 if (o->is_instance()) {
323 instanceHandle h_i(THREAD, (instanceOop)o);
324 if (java_lang_invoke_CallSite::is_instance(o))
325 return new (arena()) ciCallSite(h_i);
326 else if (java_lang_invoke_MemberName::is_instance(o))
327 return new (arena()) ciMemberName(h_i);
328 else if (java_lang_invoke_MethodHandle::is_instance(o))
329 return new (arena()) ciMethodHandle(h_i);
330 else if (java_lang_invoke_MethodType::is_instance(o))
331 return new (arena()) ciMethodType(h_i);
332 else
333 return new (arena()) ciInstance(h_i);
334 } else if (o->is_objArray()) {
335 objArrayHandle h_oa(THREAD, (objArrayOop)o);
336 return new (arena()) ciObjArray(h_oa);
337 } else if (o->is_typeArray()) {
338 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
339 return new (arena()) ciTypeArray(h_ta);
340 }
341
342 // The oop is of some type not supported by the compiler interface.
343 ShouldNotReachHere();
344 return NULL;
345 }
346
347 // ------------------------------------------------------------------
348 // ciObjectFactory::create_new_metadata
349 //
350 // Create a new ciMetadata from a Metadata*.
351 //
352 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
353 // is used, which points to it's holder.
354 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
355 EXCEPTION_CONTEXT;
356
357 // Hold metadata from unloading by keeping it's holder alive.
358 if (_initialized && o->is_klass()) {
359 Klass* holder = ((Klass*)o);
360 if (holder->oop_is_instance() && InstanceKlass::cast(holder)->is_anonymous()) {
361 // Though ciInstanceKlass records class loader oop, it's not enough to keep
362 // VM anonymous classes alive (loader == NULL). Klass holder should be used instead.
363 // It is enough to record a ciObject, since cached elements are never removed
364 // during ciObjectFactory lifetime. ciObjectFactory itself is created for
365 // every compilation and lives for the whole duration of the compilation.
366 ciObject* h = get(holder->klass_holder());
367 }
368 }
369
370 if (o->is_klass()) {
371 KlassHandle h_k(THREAD, (Klass*)o);
372 Klass* k = (Klass*)o;
373 if (k->oop_is_instance()) {
374 return new (arena()) ciInstanceKlass(h_k);
375 } else if (k->oop_is_objArray()) {
376 return new (arena()) ciObjArrayKlass(h_k);
377 } else if (k->oop_is_typeArray()) {
378 return new (arena()) ciTypeArrayKlass(h_k);
379 }
380 } else if (o->is_method()) {
381 methodHandle h_m(THREAD, (Method*)o);
382 ciEnv *env = CURRENT_THREAD_ENV;
383 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
384 return new (arena()) ciMethod(h_m, holder);
385 } else if (o->is_methodData()) {
386 // Hold methodHandle alive - might not be necessary ???
387 methodHandle h_m(THREAD, ((MethodData*)o)->method());
388 return new (arena()) ciMethodData((MethodData*)o);
389 }
390
391 // The Metadata* is of some type not supported by the compiler interface.
392 ShouldNotReachHere();
393 return NULL;
394 }
395
396 // ------------------------------------------------------------------
397 // ciObjectFactory::ensure_metadata_alive
398 //
399 // Ensure that the metadata wrapped by the ciMetadata is kept alive by GC.
400 // This is primarily useful for metadata which is considered as weak roots
401 // by the GC but need to be strong roots if reachable from a current compilation.
402 //
403 void ciObjectFactory::ensure_metadata_alive(ciMetadata* m) {
404 ASSERT_IN_VM; // We're handling raw oops here.
405
406 #if INCLUDE_ALL_GCS
407 if (!UseG1GC) {
408 return;
409 }
410 Klass* metadata_owner_klass;
411 if (m->is_klass()) {
412 metadata_owner_klass = m->as_klass()->get_Klass();
413 } else if (m->is_method()) {
414 metadata_owner_klass = m->as_method()->get_Method()->constants()->pool_holder();
415 } else {
416 fatal("Not implemented for other types of metadata");
417 return;
418 }
419
420 oop metadata_holder = metadata_owner_klass->klass_holder();
421 if (metadata_holder != NULL) {
422 G1SATBCardTableModRefBS::enqueue(metadata_holder);
423 }
424
425 #endif
426 }
427
428 //------------------------------------------------------------------
429 // ciObjectFactory::get_unloaded_method
430 //
431 // Get the ciMethod representing an unloaded/unfound method.
432 //
433 // Implementation note: unloaded methods are currently stored in
434 // an unordered array, requiring a linear-time lookup for each
435 // unloaded method. This may need to change.
436 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
437 ciSymbol* name,
438 ciSymbol* signature,
439 ciInstanceKlass* accessor) {
440 ciSignature* that = NULL;
441 for (int i = 0; i < _unloaded_methods->length(); i++) {
442 ciMethod* entry = _unloaded_methods->at(i);
443 if (entry->holder()->equals(holder) &&
444 entry->name()->equals(name) &&
445 entry->signature()->as_symbol()->equals(signature)) {
446 // Short-circuit slow resolve.
447 if (entry->signature()->accessing_klass() == accessor) {
448 // We've found a match.
449 return entry;
450 } else {
451 // Lazily create ciSignature
452 if (that == NULL) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
453 if (entry->signature()->equals(that)) {
454 // We've found a match.
455 return entry;
456 }
457 }
458 }
459 }
460
461 // This is a new unloaded method. Create it and stick it in
462 // the cache.
463 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
464
465 init_ident_of(new_method);
466 _unloaded_methods->append(new_method);
467
468 return new_method;
469 }
470
471 //------------------------------------------------------------------
472 // ciObjectFactory::get_unloaded_klass
473 //
474 // Get a ciKlass representing an unloaded klass.
475 //
476 // Implementation note: unloaded klasses are currently stored in
477 // an unordered array, requiring a linear-time lookup for each
478 // unloaded klass. This may need to change.
479 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
480 ciSymbol* name,
481 bool create_if_not_found) {
482 EXCEPTION_CONTEXT;
483 oop loader = NULL;
484 oop domain = NULL;
485 if (accessing_klass != NULL) {
486 loader = accessing_klass->loader();
487 domain = accessing_klass->protection_domain();
488 }
489 for (int i=0; i<_unloaded_klasses->length(); i++) {
490 ciKlass* entry = _unloaded_klasses->at(i);
491 if (entry->name()->equals(name) &&
492 entry->loader() == loader &&
493 entry->protection_domain() == domain) {
494 // We've found a match.
495 return entry;
496 }
497 }
498
499 if (!create_if_not_found)
500 return NULL;
501
502 // This is a new unloaded klass. Create it and stick it in
503 // the cache.
504 ciKlass* new_klass = NULL;
505
506 // Two cases: this is an unloaded ObjArrayKlass or an
507 // unloaded InstanceKlass. Deal with both.
508 if (name->byte_at(0) == '[') {
509 // Decompose the name.'
510 FieldArrayInfo fd;
511 BasicType element_type = FieldType::get_array_info(name->get_symbol(),
512 fd, THREAD);
513 if (HAS_PENDING_EXCEPTION) {
514 CLEAR_PENDING_EXCEPTION;
515 CURRENT_THREAD_ENV->record_out_of_memory_failure();
516 return ciEnv::_unloaded_ciobjarrayklass;
517 }
518 int dimension = fd.dimension();
519 assert(element_type != T_ARRAY, "unsuccessful decomposition");
520 ciKlass* element_klass = NULL;
521 if (element_type == T_OBJECT) {
522 ciEnv *env = CURRENT_THREAD_ENV;
523 ciSymbol* ci_name = env->get_symbol(fd.object_key());
524 element_klass =
525 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
526 } else {
527 assert(dimension > 1, "one dimensional type arrays are always loaded.");
528
529 // The type array itself takes care of one of the dimensions.
530 dimension--;
531
532 // The element klass is a TypeArrayKlass.
533 element_klass = ciTypeArrayKlass::make(element_type);
534 }
535 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
536 } else {
537 jobject loader_handle = NULL;
538 jobject domain_handle = NULL;
539 if (accessing_klass != NULL) {
540 loader_handle = accessing_klass->loader_handle();
541 domain_handle = accessing_klass->protection_domain_handle();
542 }
543 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle);
544 }
545 init_ident_of(new_klass);
546 _unloaded_klasses->append(new_klass);
547
548 return new_klass;
549 }
550
551
552 //------------------------------------------------------------------
553 // ciObjectFactory::get_unloaded_instance
554 //
555 // Get a ciInstance representing an as-yet undetermined instance of a given class.
556 //
557 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
558 for (int i=0; i<_unloaded_instances->length(); i++) {
559 ciInstance* entry = _unloaded_instances->at(i);
560 if (entry->klass()->equals(instance_klass)) {
561 // We've found a match.
562 return entry;
563 }
564 }
565
566 // This is a new unloaded instance. Create it and stick it in
567 // the cache.
568 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
569
570 init_ident_of(new_instance);
571 _unloaded_instances->append(new_instance);
572
573 // make sure it looks the way we want:
574 assert(!new_instance->is_loaded(), "");
575 assert(new_instance->klass() == instance_klass, "");
576
577 return new_instance;
578 }
579
580
581 //------------------------------------------------------------------
582 // ciObjectFactory::get_unloaded_klass_mirror
583 //
584 // Get a ciInstance representing an unresolved klass mirror.
585 //
586 // Currently, this ignores the parameters and returns a unique unloaded instance.
587 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
588 assert(ciEnv::_Class_klass != NULL, "");
589 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
590 }
591
592 //------------------------------------------------------------------
593 // ciObjectFactory::get_unloaded_method_handle_constant
594 //
595 // Get a ciInstance representing an unresolved method handle constant.
596 //
597 // Currently, this ignores the parameters and returns a unique unloaded instance.
598 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
599 ciSymbol* name,
600 ciSymbol* signature,
601 int ref_kind) {
602 if (ciEnv::_MethodHandle_klass == NULL) return NULL;
603 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
604 }
605
606 //------------------------------------------------------------------
607 // ciObjectFactory::get_unloaded_method_type_constant
608 //
609 // Get a ciInstance representing an unresolved method type constant.
610 //
611 // Currently, this ignores the parameters and returns a unique unloaded instance.
612 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
613 if (ciEnv::_MethodType_klass == NULL) return NULL;
614 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
615 }
616
617 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
618 if (ciEnv::_Object_klass == NULL) return NULL;
619 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
620 }
621
622 //------------------------------------------------------------------
623 // ciObjectFactory::get_empty_methodData
624 //
625 // Get the ciMethodData representing the methodData for a method with
626 // none.
627 ciMethodData* ciObjectFactory::get_empty_methodData() {
628 ciMethodData* new_methodData = new (arena()) ciMethodData();
629 init_ident_of(new_methodData);
630 return new_methodData;
631 }
632
633 //------------------------------------------------------------------
634 // ciObjectFactory::get_return_address
635 //
636 // Get a ciReturnAddress for a specified bci.
637 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
638 for (int i=0; i<_return_addresses->length(); i++) {
639 ciReturnAddress* entry = _return_addresses->at(i);
640 if (entry->bci() == bci) {
641 // We've found a match.
642 return entry;
643 }
644 }
645
646 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
647 init_ident_of(new_ret_addr);
648 _return_addresses->append(new_ret_addr);
649 return new_ret_addr;
650 }
651
652 // ------------------------------------------------------------------
653 // ciObjectFactory::init_ident_of
654 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
655 obj->set_ident(_next_ident++);
656 }
657
658 // ------------------------------------------------------------------
659 // ciObjectFactory::find
660 //
661 // Use binary search to find the position of this oop in the cache.
662 // If there is no entry in the cache corresponding to this oop, return
663 // the position at which the oop should be inserted.
664 int ciObjectFactory::find(Metadata* key, GrowableArray<ciMetadata*>* objects) {
665 int min = 0;
666 int max = objects->length()-1;
667
668 // print_contents();
669
670 while (max >= min) {
671 int mid = (max + min) / 2;
672 Metadata* value = objects->at(mid)->constant_encoding();
673 if (value < key) {
674 min = mid + 1;
675 } else if (value > key) {
676 max = mid - 1;
677 } else {
678 return mid;
679 }
680 }
681 return min;
682 }
683
684 // ------------------------------------------------------------------
685 // ciObjectFactory::is_found_at
686 //
687 // Verify that the binary seach found the given key.
688 bool ciObjectFactory::is_found_at(int index, Metadata* key, GrowableArray<ciMetadata*>* objects) {
689 return (index < objects->length() &&
690 objects->at(index)->constant_encoding() == key);
691 }
692
693
694 // ------------------------------------------------------------------
695 // ciObjectFactory::insert
696 //
697 // Insert a ciObject into the table at some index.
698 void ciObjectFactory::insert(int index, ciMetadata* obj, GrowableArray<ciMetadata*>* objects) {
699 int len = objects->length();
700 if (len == index) {
701 objects->append(obj);
702 } else {
703 objects->append(objects->at(len-1));
704 int pos;
705 for (pos = len-2; pos >= index; pos--) {
706 objects->at_put(pos+1,objects->at(pos));
707 }
708 objects->at_put(index, obj);
709 }
710 }
711
712 static ciObjectFactory::NonPermObject* emptyBucket = NULL;
713
714 // ------------------------------------------------------------------
715 // ciObjectFactory::find_non_perm
716 //
717 // Use a small hash table, hashed on the klass of the key.
718 // If there is no entry in the cache corresponding to this oop, return
719 // the null tail of the bucket into which the oop should be inserted.
720 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
721 assert(Universe::heap()->is_in_reserved(key), "must be");
722 ciMetadata* klass = get_metadata(key->klass());
723 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
724 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) {
725 if (is_equal(p, key)) break;
726 }
727 return (*bp);
728 }
729
730
731
732 // ------------------------------------------------------------------
733 // Code for for NonPermObject
734 //
735 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
736 assert(ciObjectFactory::is_initialized(), "");
737 _object = object;
738 _next = bucket;
739 bucket = this;
740 }
741
742
743
744 // ------------------------------------------------------------------
745 // ciObjectFactory::insert_non_perm
746 //
747 // Insert a ciObject into the non-perm table.
748 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
749 assert(Universe::heap()->is_in_reserved_or_null(key), "must be");
750 assert(&where != &emptyBucket, "must not try to fill empty bucket");
751 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
752 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
753 assert(find_non_perm(key) == p, "must find the same spot");
754 ++_non_perm_count;
755 }
756
757 // ------------------------------------------------------------------
758 // ciObjectFactory::vm_symbol_at
759 // Get the ciSymbol corresponding to some index in vmSymbols.
760 ciSymbol* ciObjectFactory::vm_symbol_at(int index) {
761 assert(index >= vmSymbols::FIRST_SID && index < vmSymbols::SID_LIMIT, "oob");
762 return _shared_ci_symbols[index];
763 }
764
765 // ------------------------------------------------------------------
766 // ciObjectFactory::metadata_do
767 void ciObjectFactory::metadata_do(void f(Metadata*)) {
768 if (_ci_metadata == NULL) return;
769 for (int j = 0; j< _ci_metadata->length(); j++) {
770 Metadata* o = _ci_metadata->at(j)->constant_encoding();
771 f(o);
772 }
773 }
774
775 // ------------------------------------------------------------------
776 // ciObjectFactory::print_contents_impl
777 void ciObjectFactory::print_contents_impl() {
778 int len = _ci_metadata->length();
779 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
780 for (int i=0; i<len; i++) {
781 _ci_metadata->at(i)->print();
782 tty->cr();
783 }
784 }
785
786 // ------------------------------------------------------------------
787 // ciObjectFactory::print_contents
788 void ciObjectFactory::print_contents() {
789 print();
790 tty->cr();
791 GUARDED_VM_ENTRY(print_contents_impl();)
792 }
793
794 // ------------------------------------------------------------------
795 // ciObjectFactory::print
796 //
797 // Print debugging information about the object factory
798 void ciObjectFactory::print() {
799 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
800 _non_perm_count, _ci_metadata->length(), _unloaded_methods->length(),
801 _unloaded_instances->length(),
802 _unloaded_klasses->length());
803 }