1 /*
2 * Copyright (c) 1999, 2021, 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/ciNativeEntryPoint.hpp"
31 #include "ci/ciMethod.hpp"
32 #include "ci/ciMethodData.hpp"
33 #include "ci/ciMethodHandle.hpp"
34 #include "ci/ciMethodType.hpp"
35 #include "ci/ciNullObject.hpp"
36 #include "ci/ciObjArray.hpp"
37 #include "ci/ciObjArrayKlass.hpp"
38 #include "ci/ciObject.hpp"
39 #include "ci/ciObjectFactory.hpp"
40 #include "ci/ciSymbol.hpp"
41 #include "ci/ciSymbols.hpp"
42 #include "ci/ciTypeArray.hpp"
43 #include "ci/ciTypeArrayKlass.hpp"
44 #include "ci/ciUtilities.inline.hpp"
45 #include "classfile/javaClasses.inline.hpp"
46 #include "classfile/vmClasses.hpp"
47 #include "compiler/compiler_globals.hpp"
48 #include "gc/shared/collectedHeap.inline.hpp"
49 #include "memory/allocation.inline.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "runtime/signature.hpp"
54 #include "utilities/macros.hpp"
55
56 // ciObjectFactory
57 //
58 // This class handles requests for the creation of new instances
59 // of ciObject and its subclasses. It contains a caching mechanism
60 // which ensures that for each oop, at most one ciObject is created.
61 // This invariant allows more efficient implementation of ciObject.
62 //
63 // Implementation note: the oop->ciObject mapping is represented as
64 // a table stored in an array. Even though objects are moved
65 // by the garbage collector, the compactor preserves their relative
66 // order; address comparison of oops (in perm space) is safe so long
67 // as we prohibit GC during our comparisons. We currently use binary
68 // search to find the oop in the table, and inserting a new oop
69 // into the table may be costly. If this cost ends up being
70 // problematic the underlying data structure can be switched to some
71 // sort of balanced binary tree.
72
73 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL;
74 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::number_of_symbols()];
75 int ciObjectFactory::_shared_ident_limit = 0;
76 volatile bool ciObjectFactory::_initialized = false;
77
78
79 // ------------------------------------------------------------------
80 // ciObjectFactory::ciObjectFactory
81 ciObjectFactory::ciObjectFactory(Arena* arena,
82 int expected_size)
83 : _arena(arena),
84 _ci_metadata(arena, expected_size, 0, NULL),
85 _unloaded_methods(arena, 4, 0, NULL),
86 _unloaded_klasses(arena, 8, 0, NULL),
87 _unloaded_instances(arena, 4, 0, NULL),
88 _return_addresses(arena, 8, 0, NULL),
89 _symbols(arena, 100, 0, NULL),
90 _next_ident(_shared_ident_limit),
91 _non_perm_count(0) {
92 for (int i = 0; i < NON_PERM_BUCKETS; i++) {
93 _non_perm_bucket[i] = NULL;
94 }
95
96 // If the shared ci objects exist append them to this factory's objects
97 if (_shared_ci_metadata != NULL) {
98 _ci_metadata.appendAll(_shared_ci_metadata);
99 }
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(mtCompiler);
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 for (auto index : EnumRange<vmSymbolID>{}) {
128 Symbol* vmsym = vmSymbols::symbol_at(index);
129 assert(vmSymbols::find_sid(vmsym) == index, "1-1 mapping");
130 ciSymbol* sym = new (_arena) ciSymbol(vmsym, index);
131 init_ident_of(sym);
132 _shared_ci_symbols[vmSymbols::as_int(index)] = sym;
133 }
134 #ifdef ASSERT
135 for (auto index : EnumRange<vmSymbolID>{}) {
136 Symbol* vmsym = vmSymbols::symbol_at(index);
137 ciSymbol* sym = vm_symbol_at(index);
138 assert(sym->get_symbol() == vmsym, "oop must match");
139 }
140 assert(ciSymbols::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
141 #endif
142 }
143
144 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
145 BasicType t = (BasicType)i;
146 if (type2name(t) != NULL && !is_reference_type(t) &&
147 t != T_NARROWOOP && t != T_NARROWKLASS) {
148 ciType::_basic_types[t] = new (_arena) ciType(t);
149 init_ident_of(ciType::_basic_types[t]);
150 }
151 }
152
153 ciEnv::_null_object_instance = new (_arena) ciNullObject();
154 init_ident_of(ciEnv::_null_object_instance);
155
156 #define VM_CLASS_DEFN(name, ignore_s) \
157 if (vmClasses::name##_is_loaded()) \
158 ciEnv::_##name = get_metadata(vmClasses::name())->as_instance_klass();
159
160 VM_CLASSES_DO(VM_CLASS_DEFN)
161 #undef VM_CLASS_DEFN
162
163 for (int len = -1; len != _ci_metadata.length(); ) {
164 len = _ci_metadata.length();
165 for (int i2 = 0; i2 < len; i2++) {
166 ciMetadata* obj = _ci_metadata.at(i2);
167 assert (obj->is_metadata(), "what else would it be?");
168 if (obj->is_loaded() && obj->is_instance_klass()) {
169 obj->as_instance_klass()->compute_nonstatic_fields();
170 }
171 }
172 }
173
174 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol());
175 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents
176 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, NULL, NULL);
177 init_ident_of(ciEnv::_unloaded_ciinstance_klass);
178 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
179 init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
180 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
181
182 get_metadata(Universe::boolArrayKlassObj());
183 get_metadata(Universe::charArrayKlassObj());
184 get_metadata(Universe::floatArrayKlassObj());
185 get_metadata(Universe::doubleArrayKlassObj());
186 get_metadata(Universe::byteArrayKlassObj());
187 get_metadata(Universe::shortArrayKlassObj());
188 get_metadata(Universe::intArrayKlassObj());
189 get_metadata(Universe::longArrayKlassObj());
190
191 assert(_non_perm_count == 0, "no shared non-perm objects");
192
193 // The shared_ident_limit is the first ident number that will
194 // be used for non-shared objects. That is, numbers less than
195 // this limit are permanently assigned to shared CI objects,
196 // while the higher numbers are recycled afresh by each new ciEnv.
197
198 _shared_ident_limit = _next_ident;
199 _shared_ci_metadata = &_ci_metadata;
200 }
201
202
203 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) {
204 vmSymbolID sid = vmSymbols::find_sid(key);
205 if (sid != vmSymbolID::NO_SID) {
206 // do not pollute the main cache with it
207 return vm_symbol_at(sid);
208 }
209
210 assert(vmSymbols::find_sid(key) == vmSymbolID::NO_SID, "");
211 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbolID::NO_SID);
212 _symbols.push(s);
213 return s;
214 }
215
216 // Decrement the refcount when done on symbols referenced by this compilation.
217 void ciObjectFactory::remove_symbols() {
218 for (int i = 0; i < _symbols.length(); i++) {
219 ciSymbol* s = _symbols.at(i);
220 s->get_symbol()->decrement_refcount();
221 }
222 // Since _symbols is resource allocated we're not allowed to delete it
223 // but it'll go away just the same.
224 }
225
226 // ------------------------------------------------------------------
227 // ciObjectFactory::get
228 //
229 // Get the ciObject corresponding to some oop. If the ciObject has
230 // already been created, it is returned. Otherwise, a new ciObject
231 // is created.
232 ciObject* ciObjectFactory::get(oop key) {
233 ASSERT_IN_VM;
234
235 assert(Universe::heap()->is_in(key), "must be");
236
237 NonPermObject* &bucket = find_non_perm(key);
238 if (bucket != NULL) {
239 return bucket->object();
240 }
241
242 // The ciObject does not yet exist. Create it and insert it
243 // into the cache.
244 Handle keyHandle(Thread::current(), key);
245 ciObject* new_object = create_new_object(keyHandle());
246 assert(keyHandle() == new_object->get_oop(), "must be properly recorded");
247 init_ident_of(new_object);
248 assert(Universe::heap()->is_in(new_object->get_oop()), "must be");
249
250 // Not a perm-space object.
251 insert_non_perm(bucket, keyHandle(), new_object);
252 return new_object;
253 }
254
255 int ciObjectFactory::metadata_compare(Metadata* const& key, ciMetadata* const& elt) {
256 Metadata* value = elt->constant_encoding();
257 if (key < value) return -1;
258 else if (key > value) return 1;
259 else return 0;
260 }
261
262 // ------------------------------------------------------------------
263 // ciObjectFactory::cached_metadata
264 //
265 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
266 // already been created, it is returned. Otherwise, null is returned.
267 ciMetadata* ciObjectFactory::cached_metadata(Metadata* key) {
268 ASSERT_IN_VM;
269
270 bool found = false;
271 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
272
273 if (!found) {
274 return NULL;
275 }
276 return _ci_metadata.at(index)->as_metadata();
277 }
278
279
280 // ------------------------------------------------------------------
281 // ciObjectFactory::get_metadata
282 //
283 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has
284 // already been created, it is returned. Otherwise, a new ciMetadata
285 // is created.
286 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
287 ASSERT_IN_VM;
288
289 #ifdef ASSERT
290 if (CIObjectFactoryVerify) {
291 Metadata* last = NULL;
292 for (int j = 0; j < _ci_metadata.length(); j++) {
293 Metadata* o = _ci_metadata.at(j)->constant_encoding();
294 assert(last < o, "out of order");
295 last = o;
296 }
297 }
298 #endif // ASSERT
299 int len = _ci_metadata.length();
300 bool found = false;
301 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
302 #ifdef ASSERT
303 if (CIObjectFactoryVerify) {
304 for (int i = 0; i < _ci_metadata.length(); i++) {
305 if (_ci_metadata.at(i)->constant_encoding() == key) {
306 assert(index == i, " bad lookup");
307 }
308 }
309 }
310 #endif
311
312 if (!found) {
313 // The ciMetadata does not yet exist. Create it and insert it
314 // into the cache.
315 ciMetadata* new_object = create_new_metadata(key);
316 init_ident_of(new_object);
317 assert(new_object->is_metadata(), "must be");
318
319 if (len != _ci_metadata.length()) {
320 // creating the new object has recursively entered new objects
321 // into the table. We need to recompute our index.
322 index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found);
323 }
324 assert(!found, "no double insert");
325 _ci_metadata.insert_before(index, new_object);
326 return new_object;
327 }
328 return _ci_metadata.at(index)->as_metadata();
329 }
330
331 // ------------------------------------------------------------------
332 // ciObjectFactory::create_new_object
333 //
334 // Create a new ciObject from an oop.
335 //
336 // Implementation note: this functionality could be virtual behavior
337 // of the oop itself. For now, we explicitly marshal the object.
338 ciObject* ciObjectFactory::create_new_object(oop o) {
339 EXCEPTION_CONTEXT;
340
341 if (o->is_instance()) {
342 instanceHandle h_i(THREAD, (instanceOop)o);
343 if (java_lang_invoke_CallSite::is_instance(o))
344 return new (arena()) ciCallSite(h_i);
345 else if (java_lang_invoke_MemberName::is_instance(o))
346 return new (arena()) ciMemberName(h_i);
347 else if (jdk_internal_invoke_NativeEntryPoint::is_instance(o))
348 return new (arena()) ciNativeEntryPoint(h_i);
349 else if (java_lang_invoke_MethodHandle::is_instance(o))
350 return new (arena()) ciMethodHandle(h_i);
351 else if (java_lang_invoke_MethodType::is_instance(o))
352 return new (arena()) ciMethodType(h_i);
353 else
354 return new (arena()) ciInstance(h_i);
355 } else if (o->is_objArray()) {
356 objArrayHandle h_oa(THREAD, (objArrayOop)o);
357 return new (arena()) ciObjArray(h_oa);
358 } else if (o->is_typeArray()) {
359 typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
360 return new (arena()) ciTypeArray(h_ta);
361 }
362
363 // The oop is of some type not supported by the compiler interface.
364 ShouldNotReachHere();
365 return NULL;
366 }
367
368 // ------------------------------------------------------------------
369 // ciObjectFactory::create_new_metadata
370 //
371 // Create a new ciMetadata from a Metadata*.
372 //
373 // Implementation note: in order to keep Metadata live, an auxiliary ciObject
374 // is used, which points to it's holder.
375 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) {
376 EXCEPTION_CONTEXT;
377
378 if (o->is_klass()) {
379 Klass* k = (Klass*)o;
380 if (k->is_instance_klass()) {
381 assert(!ReplayCompiles || ciReplay::no_replay_state() || !ciReplay::is_klass_unresolved((InstanceKlass*)k), "must be whitelisted for replay compilation");
382 return new (arena()) ciInstanceKlass(k);
383 } else if (k->is_objArray_klass()) {
384 return new (arena()) ciObjArrayKlass(k);
385 } else if (k->is_typeArray_klass()) {
386 return new (arena()) ciTypeArrayKlass(k);
387 }
388 } else if (o->is_method()) {
389 methodHandle h_m(THREAD, (Method*)o);
390 ciEnv *env = CURRENT_THREAD_ENV;
391 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
392 return new (arena()) ciMethod(h_m, holder);
393 } else if (o->is_methodData()) {
394 // Hold methodHandle alive - might not be necessary ???
395 methodHandle h_m(THREAD, ((MethodData*)o)->method());
396 return new (arena()) ciMethodData((MethodData*)o);
397 }
398
399 // The Metadata* is of some type not supported by the compiler interface.
400 ShouldNotReachHere();
401 return NULL;
402 }
403
404 //------------------------------------------------------------------
405 // ciObjectFactory::get_unloaded_method
406 //
407 // Get the ciMethod representing an unloaded/unfound method.
408 //
409 // Implementation note: unloaded methods are currently stored in
410 // an unordered array, requiring a linear-time lookup for each
411 // unloaded method. This may need to change.
412 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
413 ciSymbol* name,
414 ciSymbol* signature,
415 ciInstanceKlass* accessor) {
416 assert(accessor != NULL, "need origin of access");
417 ciSignature* that = NULL;
418 for (int i = 0; i < _unloaded_methods.length(); i++) {
419 ciMethod* entry = _unloaded_methods.at(i);
420 if (entry->holder()->equals(holder) &&
421 entry->name()->equals(name) &&
422 entry->signature()->as_symbol()->equals(signature)) {
423 // Short-circuit slow resolve.
424 if (entry->signature()->accessing_klass() == accessor) {
425 // We've found a match.
426 return entry;
427 } else {
428 // Lazily create ciSignature
429 if (that == NULL) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
430 if (entry->signature()->equals(that)) {
431 // We've found a match.
432 return entry;
433 }
434 }
435 }
436 }
437
438 // This is a new unloaded method. Create it and stick it in
439 // the cache.
440 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
441
442 init_ident_of(new_method);
443 _unloaded_methods.append(new_method);
444
445 return new_method;
446 }
447
448 //------------------------------------------------------------------
449 // ciObjectFactory::get_unloaded_klass
450 //
451 // Get a ciKlass representing an unloaded klass.
452 //
453 // Implementation note: unloaded klasses are currently stored in
454 // an unordered array, requiring a linear-time lookup for each
455 // unloaded klass. This may need to change.
456 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
457 ciSymbol* name,
458 bool create_if_not_found) {
459 EXCEPTION_CONTEXT;
460 oop loader = NULL;
461 oop domain = NULL;
462 if (accessing_klass != NULL) {
463 loader = accessing_klass->loader();
464 domain = accessing_klass->protection_domain();
465 }
466 for (int i = 0; i < _unloaded_klasses.length(); i++) {
467 ciKlass* entry = _unloaded_klasses.at(i);
468 if (entry->name()->equals(name) &&
469 entry->loader() == loader &&
470 entry->protection_domain() == domain) {
471 // We've found a match.
472 return entry;
473 }
474 }
475
476 if (!create_if_not_found)
477 return NULL;
478
479 // This is a new unloaded klass. Create it and stick it in
480 // the cache.
481 ciKlass* new_klass = NULL;
482
483 // Two cases: this is an unloaded ObjArrayKlass or an
484 // unloaded InstanceKlass. Deal with both.
485 if (name->char_at(0) == JVM_SIGNATURE_ARRAY) {
486 // Decompose the name.'
487 SignatureStream ss(name->get_symbol(), false);
488 int dimension = ss.skip_array_prefix(); // skip all '['s
489 BasicType element_type = ss.type();
490 assert(element_type != T_ARRAY, "unsuccessful decomposition");
491 ciKlass* element_klass = NULL;
492 if (element_type == T_OBJECT) {
493 ciEnv *env = CURRENT_THREAD_ENV;
494 ciSymbol* ci_name = env->get_symbol(ss.as_symbol());
495 element_klass =
496 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
497 } else {
498 assert(dimension > 1, "one dimensional type arrays are always loaded.");
499
500 // The type array itself takes care of one of the dimensions.
501 dimension--;
502
503 // The element klass is a TypeArrayKlass.
504 element_klass = ciTypeArrayKlass::make(element_type);
505 }
506 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
507 } else {
508 jobject loader_handle = NULL;
509 jobject domain_handle = NULL;
510 if (accessing_klass != NULL) {
511 loader_handle = accessing_klass->loader_handle();
512 domain_handle = accessing_klass->protection_domain_handle();
513 }
514 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle);
515 }
516 init_ident_of(new_klass);
517 _unloaded_klasses.append(new_klass);
518
519 return new_klass;
520 }
521
522
523 //------------------------------------------------------------------
524 // ciObjectFactory::get_unloaded_instance
525 //
526 // Get a ciInstance representing an as-yet undetermined instance of a given class.
527 //
528 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
529 for (int i = 0; i < _unloaded_instances.length(); i++) {
530 ciInstance* entry = _unloaded_instances.at(i);
531 if (entry->klass()->equals(instance_klass)) {
532 // We've found a match.
533 return entry;
534 }
535 }
536
537 // This is a new unloaded instance. Create it and stick it in
538 // the cache.
539 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
540
541 init_ident_of(new_instance);
542 _unloaded_instances.append(new_instance);
543
544 // make sure it looks the way we want:
545 assert(!new_instance->is_loaded(), "");
546 assert(new_instance->klass() == instance_klass, "");
547
548 return new_instance;
549 }
550
551
552 //------------------------------------------------------------------
553 // ciObjectFactory::get_unloaded_klass_mirror
554 //
555 // Get a ciInstance representing an unresolved klass mirror.
556 //
557 // Currently, this ignores the parameters and returns a unique unloaded instance.
558 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
559 assert(ciEnv::_Class_klass != NULL, "");
560 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
561 }
562
563 //------------------------------------------------------------------
564 // ciObjectFactory::get_unloaded_method_handle_constant
565 //
566 // Get a ciInstance representing an unresolved method handle constant.
567 //
568 // Currently, this ignores the parameters and returns a unique unloaded instance.
569 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
570 ciSymbol* name,
571 ciSymbol* signature,
572 int ref_kind) {
573 assert(ciEnv::_MethodHandle_klass != NULL, "");
574 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
575 }
576
577 //------------------------------------------------------------------
578 // ciObjectFactory::get_unloaded_method_type_constant
579 //
580 // Get a ciInstance representing an unresolved method type constant.
581 //
582 // Currently, this ignores the parameters and returns a unique unloaded instance.
583 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
584 assert(ciEnv::_MethodType_klass != NULL, "");
585 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
586 }
587
588 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
589 assert(ciEnv::_Object_klass != NULL, "");
590 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
591 }
592
593 //------------------------------------------------------------------
594 // ciObjectFactory::get_empty_methodData
595 //
596 // Get the ciMethodData representing the methodData for a method with
597 // none.
598 ciMethodData* ciObjectFactory::get_empty_methodData() {
599 ciMethodData* new_methodData = new (arena()) ciMethodData();
600 init_ident_of(new_methodData);
601 return new_methodData;
602 }
603
604 //------------------------------------------------------------------
605 // ciObjectFactory::get_return_address
606 //
607 // Get a ciReturnAddress for a specified bci.
608 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
609 for (int i = 0; i < _return_addresses.length(); i++) {
610 ciReturnAddress* entry = _return_addresses.at(i);
611 if (entry->bci() == bci) {
612 // We've found a match.
613 return entry;
614 }
615 }
616
617 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
618 init_ident_of(new_ret_addr);
619 _return_addresses.append(new_ret_addr);
620 return new_ret_addr;
621 }
622
623 // ------------------------------------------------------------------
624 // ciObjectFactory::init_ident_of
625 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
626 obj->set_ident(_next_ident++);
627 }
628
629 static ciObjectFactory::NonPermObject* emptyBucket = NULL;
630
631 // ------------------------------------------------------------------
632 // ciObjectFactory::find_non_perm
633 //
634 // Use a small hash table, hashed on the klass of the key.
635 // If there is no entry in the cache corresponding to this oop, return
636 // the null tail of the bucket into which the oop should be inserted.
637 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
638 assert(Universe::heap()->is_in(key), "must be");
639 ciMetadata* klass = get_metadata(key->klass());
640 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
641 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) {
642 if (is_equal(p, key)) break;
643 }
644 return (*bp);
645 }
646
647
648
649 // ------------------------------------------------------------------
650 // Code for for NonPermObject
651 //
652 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
653 assert(ciObjectFactory::is_initialized(), "");
654 _object = object;
655 _next = bucket;
656 bucket = this;
657 }
658
659
660
661 // ------------------------------------------------------------------
662 // ciObjectFactory::insert_non_perm
663 //
664 // Insert a ciObject into the non-perm table.
665 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
666 assert(Universe::heap()->is_in_or_null(key), "must be");
667 assert(&where != &emptyBucket, "must not try to fill empty bucket");
668 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
669 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
670 assert(find_non_perm(key) == p, "must find the same spot");
671 ++_non_perm_count;
672 }
673
674 // ------------------------------------------------------------------
675 // ciObjectFactory::vm_symbol_at
676 // Get the ciSymbol corresponding to some index in vmSymbols.
677 ciSymbol* ciObjectFactory::vm_symbol_at(vmSymbolID sid) {
678 int index = vmSymbols::as_int(sid);
679 return _shared_ci_symbols[index];
680 }
681
682 // ------------------------------------------------------------------
683 // ciObjectFactory::metadata_do
684 void ciObjectFactory::metadata_do(MetadataClosure* f) {
685 for (int j = 0; j < _ci_metadata.length(); j++) {
686 Metadata* o = _ci_metadata.at(j)->constant_encoding();
687 f->do_metadata(o);
688 }
689 }
690
691 // ------------------------------------------------------------------
692 // ciObjectFactory::print_contents_impl
693 void ciObjectFactory::print_contents_impl() {
694 int len = _ci_metadata.length();
695 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
696 for (int i = 0; i < len; i++) {
697 _ci_metadata.at(i)->print();
698 tty->cr();
699 }
700 }
701
702 // ------------------------------------------------------------------
703 // ciObjectFactory::print_contents
704 void ciObjectFactory::print_contents() {
705 print();
706 tty->cr();
707 GUARDED_VM_ENTRY(print_contents_impl();)
708 }
709
710 // ------------------------------------------------------------------
711 // ciObjectFactory::print
712 //
713 // Print debugging information about the object factory
714 void ciObjectFactory::print() {
715 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
716 _non_perm_count, _ci_metadata.length(), _unloaded_methods.length(),
717 _unloaded_instances.length(),
718 _unloaded_klasses.length());
719 }