1 /*
2 * Copyright (c) 1999, 2014, 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 #if INCLUDE_ALL_GCS
50 # include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
51 #endif
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, opt) \
162 if (SystemDictionary::name() != NULL) \
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::singleArrayKlassObj());
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(key);
252 ciObject* new_object = create_new_object(keyHandle());
253 assert(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 // ------------------------------------------------------------------
263 // ciObjectFactory::get_metadata
264 //
265 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
266 // already been created, it is returned. Otherwise, a new ciMetadata
267 // is created.
268 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
269 ASSERT_IN_VM;
270
271 #ifdef ASSERT
272 if (CIObjectFactoryVerify) {
273 Metadata* last = NULL;
274 for (int j = 0; j< _ci_metadata->length(); j++) {
275 Metadata* o = _ci_metadata->at(j)->constant_encoding();
276 assert(last < o, "out of order");
277 last = o;
278 }
279 }
280 #endif // ASSERT
281 int len = _ci_metadata->length();
282 int index = find(key, _ci_metadata);
283 #ifdef ASSERT
284 if (CIObjectFactoryVerify) {
285 for (int i=0; i<_ci_metadata->length(); i++) {
286 if (_ci_metadata->at(i)->constant_encoding() == key) {
287 assert(index == i, " bad lookup");
288 }
289 }
290 }
291 #endif
292 if (!is_found_at(index, key, _ci_metadata)) {
293 // The ciMetadata does not yet exist. Create it and insert it
294 // into the cache.
295 ciMetadata* new_object = create_new_metadata(key);
296 init_ident_of(new_object);
297 assert(new_object->is_metadata(), "must be");
298
299 if (len != _ci_metadata->length()) {
300 // creating the new object has recursively entered new objects
301 // into the table. We need to recompute our index.
302 index = find(key, _ci_metadata);
303 }
304 assert(!is_found_at(index, key, _ci_metadata), "no double insert");
305 insert(index, new_object, _ci_metadata);
306 return new_object;
307 }
308 return _ci_metadata->at(index)->as_metadata();
309 }
310
311 // ------------------------------------------------------------------
312 // ciObjectFactory::create_new_object
313 //
314 // Create a new ciObject from an oop.
315 //
316 // Implementation note: this functionality could be virtual behavior
317 // of the oop itself. For now, we explicitly marshal the object.
318 ciObject* ciObjectFactory::create_new_object(oop o) {
319 EXCEPTION_CONTEXT;
320
321 if (o->is_instance()) {
322 instanceHandle h_i(THREAD, (instanceOop)o);
323 if (java_lang_invoke_CallSite::is_instance(o))
324 return new (arena()) ciCallSite(h_i);
325 else if (java_lang_invoke_MemberName::is_instance(o))
326 return new (arena()) ciMemberName(h_i);
327 else if (java_lang_invoke_MethodHandle::is_instance(o))
328 return new (arena()) ciMethodHandle(h_i);
329 else if (java_lang_invoke_MethodType::is_instance(o))
330 return new (arena()) ciMethodType(h_i);
331 else
332 return new (arena()) ciInstance(h_i);
333 } else if (o->is_objArray()) {
334 objArrayHandle h_oa(THREAD, (objArrayOop)o);
335 return new (arena()) ciObjArray(h_oa);
336 } else if (o->is_typeArray()) {
337 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
338 return new (arena()) ciTypeArray(h_ta);
339 }
340
341 // The oop is of some type not supported by the compiler interface.
342 ShouldNotReachHere();
343 return NULL;
344 }
345
346 // ------------------------------------------------------------------
347 // ciObjectFactory::create_new_metadata
348 //
349 // Create a new ciMetadata from a Metadata*.
350 //
351 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
352 // is used, which points to it's holder.
353 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
354 EXCEPTION_CONTEXT;
355
356 // Hold metadata from unloading by keeping it's holder alive.
357 if (_initialized && o->is_klass()) {
358 Klass* holder = ((Klass*)o);
359 if (holder->oop_is_instance() && InstanceKlass::cast(holder)->is_anonymous()) {
360 // Though ciInstanceKlass records class loader oop, it's not enough to keep
361 // VM anonymous classes alive (loader == NULL). Klass holder should be used instead.
362 // It is enough to record a ciObject, since cached elements are never removed
363 // during ciObjectFactory lifetime. ciObjectFactory itself is created for
364 // every compilation and lives for the whole duration of the compilation.
365 ciObject* h = get(holder->klass_holder());
366 }
367 }
368
369 if (o->is_klass()) {
370 KlassHandle h_k(THREAD, (Klass*)o);
371 Klass* k = (Klass*)o;
372 if (k->oop_is_instance()) {
373 return new (arena()) ciInstanceKlass(h_k);
374 } else if (k->oop_is_objArray()) {
375 return new (arena()) ciObjArrayKlass(h_k);
376 } else if (k->oop_is_typeArray()) {
377 return new (arena()) ciTypeArrayKlass(h_k);
378 }
379 } else if (o->is_method()) {
380 methodHandle h_m(THREAD, (Method*)o);
381 ciEnv *env = CURRENT_THREAD_ENV;
382 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
383 return new (arena()) ciMethod(h_m, holder);
384 } else if (o->is_methodData()) {
385 // Hold methodHandle alive - might not be necessary ???
386 methodHandle h_m(THREAD, ((MethodData*)o)->method());
387 return new (arena()) ciMethodData((MethodData*)o);
388 }
389
390 // The Metadata* is of some type not supported by the compiler interface.
391 ShouldNotReachHere();
392 return NULL;
393 }
394
395 // ------------------------------------------------------------------
396 // ciObjectFactory::ensure_metadata_alive
397 //
398 // Ensure that the metadata wrapped by the ciMetadata is kept alive by GC.
399 // This is primarily useful for metadata which is considered as weak roots
400 // by the GC but need to be strong roots if reachable from a current compilation.
401 //
402 void ciObjectFactory::ensure_metadata_alive(ciMetadata* m) {
403 ASSERT_IN_VM; // We're handling raw oops here.
404
405 #if INCLUDE_ALL_GCS
406 if (!UseG1GC) {
407 return;
408 }
409 Klass* metadata_owner_klass;
410 if (m->is_klass()) {
411 metadata_owner_klass = m->as_klass()->get_Klass();
412 } else if (m->is_method()) {
413 metadata_owner_klass = m->as_method()->get_Method()->constants()->pool_holder();
414 } else {
415 fatal("Not implemented for other types of metadata");
416 return;
417 }
418
419 oop metadata_holder = metadata_owner_klass->klass_holder();
420 if (metadata_holder != NULL) {
421 G1SATBCardTableModRefBS::enqueue(metadata_holder);
422 }
423
424 #endif
425 }
426
427 //------------------------------------------------------------------
428 // ciObjectFactory::get_unloaded_method
429 //
430 // Get the ciMethod representing an unloaded/unfound method.
431 //
432 // Implementation note: unloaded methods are currently stored in
433 // an unordered array, requiring a linear-time lookup for each
434 // unloaded method. This may need to change.
435 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
436 ciSymbol* name,
437 ciSymbol* signature,
438 ciInstanceKlass* accessor) {
439 ciSignature* that = NULL;
440 for (int i = 0; i < _unloaded_methods->length(); i++) {
441 ciMethod* entry = _unloaded_methods->at(i);
442 if (entry->holder()->equals(holder) &&
443 entry->name()->equals(name) &&
444 entry->signature()->as_symbol()->equals(signature)) {
445 // Short-circuit slow resolve.
446 if (entry->signature()->accessing_klass() == accessor) {
447 // We've found a match.
448 return entry;
449 } else {
450 // Lazily create ciSignature
451 if (that == NULL) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
452 if (entry->signature()->equals(that)) {
453 // We've found a match.
454 return entry;
455 }
456 }
457 }
458 }
459
460 // This is a new unloaded method. Create it and stick it in
461 // the cache.
462 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
463
464 init_ident_of(new_method);
465 _unloaded_methods->append(new_method);
466
467 return new_method;
468 }
469
470 //------------------------------------------------------------------
471 // ciObjectFactory::get_unloaded_klass
472 //
473 // Get a ciKlass representing an unloaded klass.
474 //
475 // Implementation note: unloaded klasses are currently stored in
476 // an unordered array, requiring a linear-time lookup for each
477 // unloaded klass. This may need to change.
478 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
479 ciSymbol* name,
480 bool create_if_not_found) {
481 EXCEPTION_CONTEXT;
482 oop loader = NULL;
483 oop domain = NULL;
484 if (accessing_klass != NULL) {
485 loader = accessing_klass->loader();
486 domain = accessing_klass->protection_domain();
487 }
488 for (int i=0; i<_unloaded_klasses->length(); i++) {
489 ciKlass* entry = _unloaded_klasses->at(i);
490 if (entry->name()->equals(name) &&
491 entry->loader() == loader &&
492 entry->protection_domain() == domain) {
493 // We've found a match.
494 return entry;
495 }
496 }
497
498 if (!create_if_not_found)
499 return NULL;
500
501 // This is a new unloaded klass. Create it and stick it in
502 // the cache.
503 ciKlass* new_klass = NULL;
504
505 // Two cases: this is an unloaded ObjArrayKlass or an
506 // unloaded InstanceKlass. Deal with both.
507 if (name->byte_at(0) == '[') {
508 // Decompose the name.'
509 FieldArrayInfo fd;
510 BasicType element_type = FieldType::get_array_info(name->get_symbol(),
511 fd, THREAD);
512 if (HAS_PENDING_EXCEPTION) {
513 CLEAR_PENDING_EXCEPTION;
514 CURRENT_THREAD_ENV->record_out_of_memory_failure();
515 return ciEnv::_unloaded_ciobjarrayklass;
516 }
517 int dimension = fd.dimension();
518 assert(element_type != T_ARRAY, "unsuccessful decomposition");
519 ciKlass* element_klass = NULL;
520 if (element_type == T_OBJECT) {
521 ciEnv *env = CURRENT_THREAD_ENV;
522 ciSymbol* ci_name = env->get_symbol(fd.object_key());
523 element_klass =
524 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
525 } else {
526 assert(dimension > 1, "one dimensional type arrays are always loaded.");
527
528 // The type array itself takes care of one of the dimensions.
529 dimension--;
530
531 // The element klass is a TypeArrayKlass.
532 element_klass = ciTypeArrayKlass::make(element_type);
533 }
534 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
535 } else {
536 jobject loader_handle = NULL;
537 jobject domain_handle = NULL;
538 if (accessing_klass != NULL) {
539 loader_handle = accessing_klass->loader_handle();
540 domain_handle = accessing_klass->protection_domain_handle();
541 }
542 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle);
543 }
544 init_ident_of(new_klass);
545 _unloaded_klasses->append(new_klass);
546
547 return new_klass;
548 }
549
550
551 //------------------------------------------------------------------
552 // ciObjectFactory::get_unloaded_instance
553 //
554 // Get a ciInstance representing an as-yet undetermined instance of a given class.
555 //
556 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
557 for (int i=0; i<_unloaded_instances->length(); i++) {
558 ciInstance* entry = _unloaded_instances->at(i);
559 if (entry->klass()->equals(instance_klass)) {
560 // We've found a match.
561 return entry;
562 }
563 }
564
565 // This is a new unloaded instance. Create it and stick it in
566 // the cache.
567 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
568
569 init_ident_of(new_instance);
570 _unloaded_instances->append(new_instance);
571
572 // make sure it looks the way we want:
573 assert(!new_instance->is_loaded(), "");
574 assert(new_instance->klass() == instance_klass, "");
575
576 return new_instance;
577 }
578
579
580 //------------------------------------------------------------------
581 // ciObjectFactory::get_unloaded_klass_mirror
582 //
583 // Get a ciInstance representing an unresolved klass mirror.
584 //
585 // Currently, this ignores the parameters and returns a unique unloaded instance.
586 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
587 assert(ciEnv::_Class_klass != NULL, "");
588 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
589 }
590
591 //------------------------------------------------------------------
592 // ciObjectFactory::get_unloaded_method_handle_constant
593 //
594 // Get a ciInstance representing an unresolved method handle constant.
595 //
596 // Currently, this ignores the parameters and returns a unique unloaded instance.
597 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
598 ciSymbol* name,
599 ciSymbol* signature,
600 int ref_kind) {
601 if (ciEnv::_MethodHandle_klass == NULL) return NULL;
602 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
603 }
604
605 //------------------------------------------------------------------
606 // ciObjectFactory::get_unloaded_method_type_constant
607 //
608 // Get a ciInstance representing an unresolved method type constant.
609 //
610 // Currently, this ignores the parameters and returns a unique unloaded instance.
611 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
612 if (ciEnv::_MethodType_klass == NULL) return NULL;
613 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
614 }
615
616 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
617 if (ciEnv::_Object_klass == NULL) return NULL;
618 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
619 }
620
621 //------------------------------------------------------------------
622 // ciObjectFactory::get_empty_methodData
623 //
624 // Get the ciMethodData representing the methodData for a method with
625 // none.
626 ciMethodData* ciObjectFactory::get_empty_methodData() {
627 ciMethodData* new_methodData = new (arena()) ciMethodData();
628 init_ident_of(new_methodData);
629 return new_methodData;
630 }
631
632 //------------------------------------------------------------------
633 // ciObjectFactory::get_return_address
634 //
635 // Get a ciReturnAddress for a specified bci.
636 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
637 for (int i=0; i<_return_addresses->length(); i++) {
638 ciReturnAddress* entry = _return_addresses->at(i);
639 if (entry->bci() == bci) {
640 // We've found a match.
641 return entry;
642 }
643 }
644
645 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
646 init_ident_of(new_ret_addr);
647 _return_addresses->append(new_ret_addr);
648 return new_ret_addr;
649 }
650
651 // ------------------------------------------------------------------
652 // ciObjectFactory::init_ident_of
653 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
654 obj->set_ident(_next_ident++);
655 }
656
657 // ------------------------------------------------------------------
658 // ciObjectFactory::find
659 //
660 // Use binary search to find the position of this oop in the cache.
661 // If there is no entry in the cache corresponding to this oop, return
662 // the position at which the oop should be inserted.
663 int ciObjectFactory::find(Metadata* key, GrowableArray<ciMetadata*>* objects) {
664 int min = 0;
665 int max = objects->length()-1;
666
667 // print_contents();
668
669 while (max >= min) {
670 int mid = (max + min) / 2;
671 Metadata* value = objects->at(mid)->constant_encoding();
672 if (value < key) {
673 min = mid + 1;
674 } else if (value > key) {
675 max = mid - 1;
676 } else {
677 return mid;
678 }
679 }
680 return min;
681 }
682
683 // ------------------------------------------------------------------
684 // ciObjectFactory::is_found_at
685 //
686 // Verify that the binary seach found the given key.
687 bool ciObjectFactory::is_found_at(int index, Metadata* key, GrowableArray<ciMetadata*>* objects) {
688 return (index < objects->length() &&
689 objects->at(index)->constant_encoding() == key);
690 }
691
692
693 // ------------------------------------------------------------------
694 // ciObjectFactory::insert
695 //
696 // Insert a ciObject into the table at some index.
697 void ciObjectFactory::insert(int index, ciMetadata* obj, GrowableArray<ciMetadata*>* objects) {
698 int len = objects->length();
699 if (len == index) {
700 objects->append(obj);
701 } else {
702 objects->append(objects->at(len-1));
703 int pos;
704 for (pos = len-2; pos >= index; pos--) {
705 objects->at_put(pos+1,objects->at(pos));
706 }
707 objects->at_put(index, obj);
708 }
709 }
710
711 static ciObjectFactory::NonPermObject* emptyBucket = NULL;
712
713 // ------------------------------------------------------------------
714 // ciObjectFactory::find_non_perm
715 //
716 // Use a small hash table, hashed on the klass of the key.
717 // If there is no entry in the cache corresponding to this oop, return
718 // the null tail of the bucket into which the oop should be inserted.
719 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
720 assert(Universe::heap()->is_in_reserved(key), "must be");
721 ciMetadata* klass = get_metadata(key->klass());
722 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
723 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) {
724 if (is_equal(p, key)) break;
725 }
726 return (*bp);
727 }
728
729
730
731 // ------------------------------------------------------------------
732 // Code for for NonPermObject
733 //
734 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
735 assert(ciObjectFactory::is_initialized(), "");
736 _object = object;
737 _next = bucket;
738 bucket = this;
739 }
740
741
742
743 // ------------------------------------------------------------------
744 // ciObjectFactory::insert_non_perm
745 //
746 // Insert a ciObject into the non-perm table.
747 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
748 assert(Universe::heap()->is_in_reserved_or_null(key), "must be");
749 assert(&where != &emptyBucket, "must not try to fill empty bucket");
750 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
751 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
752 assert(find_non_perm(key) == p, "must find the same spot");
753 ++_non_perm_count;
754 }
755
756 // ------------------------------------------------------------------
757 // ciObjectFactory::vm_symbol_at
758 // Get the ciSymbol corresponding to some index in vmSymbols.
759 ciSymbol* ciObjectFactory::vm_symbol_at(int index) {
760 assert(index >= vmSymbols::FIRST_SID && index < vmSymbols::SID_LIMIT, "oob");
761 return _shared_ci_symbols[index];
762 }
763
764 // ------------------------------------------------------------------
765 // ciObjectFactory::metadata_do
766 void ciObjectFactory::metadata_do(void f(Metadata*)) {
767 if (_ci_metadata == NULL) return;
768 for (int j = 0; j< _ci_metadata->length(); j++) {
769 Metadata* o = _ci_metadata->at(j)->constant_encoding();
770 f(o);
771 }
772 }
773
774 // ------------------------------------------------------------------
775 // ciObjectFactory::print_contents_impl
776 void ciObjectFactory::print_contents_impl() {
777 int len = _ci_metadata->length();
778 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
779 for (int i=0; i<len; i++) {
780 _ci_metadata->at(i)->print();
781 tty->cr();
782 }
783 }
784
785 // ------------------------------------------------------------------
786 // ciObjectFactory::print_contents
787 void ciObjectFactory::print_contents() {
788 print();
789 tty->cr();
790 GUARDED_VM_ENTRY(print_contents_impl();)
791 }
792
793 // ------------------------------------------------------------------
794 // ciObjectFactory::print
795 //
796 // Print debugging information about the object factory
797 void ciObjectFactory::print() {
798 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
799 _non_perm_count, _ci_metadata->length(), _unloaded_methods->length(),
800 _unloaded_instances->length(),
801 _unloaded_klasses->length());
802 }