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 return new (arena()) ciInstanceKlass(k);
382 } else if (k->is_objArray_klass()) {
383 return new (arena()) ciObjArrayKlass(k);
384 } else if (k->is_typeArray_klass()) {
385 return new (arena()) ciTypeArrayKlass(k);
386 }
387 } else if (o->is_method()) {
388 methodHandle h_m(THREAD, (Method*)o);
389 ciEnv *env = CURRENT_THREAD_ENV;
390 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder());
391 return new (arena()) ciMethod(h_m, holder);
392 } else if (o->is_methodData()) {
393 // Hold methodHandle alive - might not be necessary ???
394 methodHandle h_m(THREAD, ((MethodData*)o)->method());
395 return new (arena()) ciMethodData((MethodData*)o);
396 }
397
398 // The Metadata* is of some type not supported by the compiler interface.
399 ShouldNotReachHere();
400 return NULL;
401 }
402
403 //------------------------------------------------------------------
404 // ciObjectFactory::get_unloaded_method
405 //
406 // Get the ciMethod representing an unloaded/unfound method.
407 //
408 // Implementation note: unloaded methods are currently stored in
409 // an unordered array, requiring a linear-time lookup for each
410 // unloaded method. This may need to change.
411 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
412 ciSymbol* name,
413 ciSymbol* signature,
414 ciInstanceKlass* accessor) {
415 assert(accessor != NULL, "need origin of access");
416 ciSignature* that = NULL;
417 for (int i = 0; i < _unloaded_methods.length(); i++) {
418 ciMethod* entry = _unloaded_methods.at(i);
419 if (entry->holder()->equals(holder) &&
420 entry->name()->equals(name) &&
421 entry->signature()->as_symbol()->equals(signature)) {
422 // Short-circuit slow resolve.
423 if (entry->signature()->accessing_klass() == accessor) {
424 // We've found a match.
425 return entry;
426 } else {
427 // Lazily create ciSignature
428 if (that == NULL) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
429 if (entry->signature()->equals(that)) {
430 // We've found a match.
431 return entry;
432 }
433 }
434 }
435 }
436
437 // This is a new unloaded method. Create it and stick it in
438 // the cache.
439 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
440
441 init_ident_of(new_method);
442 _unloaded_methods.append(new_method);
443
444 return new_method;
445 }
446
447 //------------------------------------------------------------------
448 // ciObjectFactory::get_unloaded_klass
449 //
450 // Get a ciKlass representing an unloaded klass.
451 //
452 // Implementation note: unloaded klasses are currently stored in
453 // an unordered array, requiring a linear-time lookup for each
454 // unloaded klass. This may need to change.
455 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
456 ciSymbol* name,
457 bool create_if_not_found) {
458 EXCEPTION_CONTEXT;
459 oop loader = NULL;
460 oop domain = NULL;
461 if (accessing_klass != NULL) {
462 loader = accessing_klass->loader();
463 domain = accessing_klass->protection_domain();
464 }
465 for (int i = 0; i < _unloaded_klasses.length(); i++) {
466 ciKlass* entry = _unloaded_klasses.at(i);
467 if (entry->name()->equals(name) &&
468 entry->loader() == loader &&
469 entry->protection_domain() == domain) {
470 // We've found a match.
471 return entry;
472 }
473 }
474
475 if (!create_if_not_found)
476 return NULL;
477
478 // This is a new unloaded klass. Create it and stick it in
479 // the cache.
480 ciKlass* new_klass = NULL;
481
482 // Two cases: this is an unloaded ObjArrayKlass or an
483 // unloaded InstanceKlass. Deal with both.
484 if (name->char_at(0) == JVM_SIGNATURE_ARRAY) {
485 // Decompose the name.'
486 SignatureStream ss(name->get_symbol(), false);
487 int dimension = ss.skip_array_prefix(); // skip all '['s
488 BasicType element_type = ss.type();
489 assert(element_type != T_ARRAY, "unsuccessful decomposition");
490 ciKlass* element_klass = NULL;
491 if (element_type == T_OBJECT) {
492 ciEnv *env = CURRENT_THREAD_ENV;
493 ciSymbol* ci_name = env->get_symbol(ss.as_symbol());
494 element_klass =
495 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
496 } else {
497 assert(dimension > 1, "one dimensional type arrays are always loaded.");
498
499 // The type array itself takes care of one of the dimensions.
500 dimension--;
501
502 // The element klass is a TypeArrayKlass.
503 element_klass = ciTypeArrayKlass::make(element_type);
504 }
505 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
506 } else {
507 jobject loader_handle = NULL;
508 jobject domain_handle = NULL;
509 if (accessing_klass != NULL) {
510 loader_handle = accessing_klass->loader_handle();
511 domain_handle = accessing_klass->protection_domain_handle();
512 }
513 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle);
514 }
515 init_ident_of(new_klass);
516 _unloaded_klasses.append(new_klass);
517
518 return new_klass;
519 }
520
521
522 //------------------------------------------------------------------
523 // ciObjectFactory::get_unloaded_instance
524 //
525 // Get a ciInstance representing an as-yet undetermined instance of a given class.
526 //
527 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
528 for (int i = 0; i < _unloaded_instances.length(); i++) {
529 ciInstance* entry = _unloaded_instances.at(i);
530 if (entry->klass()->equals(instance_klass)) {
531 // We've found a match.
532 return entry;
533 }
534 }
535
536 // This is a new unloaded instance. Create it and stick it in
537 // the cache.
538 ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
539
540 init_ident_of(new_instance);
541 _unloaded_instances.append(new_instance);
542
543 // make sure it looks the way we want:
544 assert(!new_instance->is_loaded(), "");
545 assert(new_instance->klass() == instance_klass, "");
546
547 return new_instance;
548 }
549
550
551 //------------------------------------------------------------------
552 // ciObjectFactory::get_unloaded_klass_mirror
553 //
554 // Get a ciInstance representing an unresolved klass mirror.
555 //
556 // Currently, this ignores the parameters and returns a unique unloaded instance.
557 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) {
558 assert(ciEnv::_Class_klass != NULL, "");
559 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
560 }
561
562 //------------------------------------------------------------------
563 // ciObjectFactory::get_unloaded_method_handle_constant
564 //
565 // Get a ciInstance representing an unresolved method handle constant.
566 //
567 // Currently, this ignores the parameters and returns a unique unloaded instance.
568 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder,
569 ciSymbol* name,
570 ciSymbol* signature,
571 int ref_kind) {
572 if (ciEnv::_MethodHandle_klass == NULL) return NULL;
573 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
574 }
575
576 //------------------------------------------------------------------
577 // ciObjectFactory::get_unloaded_method_type_constant
578 //
579 // Get a ciInstance representing an unresolved method type constant.
580 //
581 // Currently, this ignores the parameters and returns a unique unloaded instance.
582 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
583 if (ciEnv::_MethodType_klass == NULL) return NULL;
584 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
585 }
586
587 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
588 if (ciEnv::_Object_klass == NULL) return NULL;
589 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
590 }
591
592 //------------------------------------------------------------------
593 // ciObjectFactory::get_empty_methodData
594 //
595 // Get the ciMethodData representing the methodData for a method with
596 // none.
597 ciMethodData* ciObjectFactory::get_empty_methodData() {
598 ciMethodData* new_methodData = new (arena()) ciMethodData();
599 init_ident_of(new_methodData);
600 return new_methodData;
601 }
602
603 //------------------------------------------------------------------
604 // ciObjectFactory::get_return_address
605 //
606 // Get a ciReturnAddress for a specified bci.
607 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
608 for (int i = 0; i < _return_addresses.length(); i++) {
609 ciReturnAddress* entry = _return_addresses.at(i);
610 if (entry->bci() == bci) {
611 // We've found a match.
612 return entry;
613 }
614 }
615
616 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
617 init_ident_of(new_ret_addr);
618 _return_addresses.append(new_ret_addr);
619 return new_ret_addr;
620 }
621
622 // ------------------------------------------------------------------
623 // ciObjectFactory::init_ident_of
624 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
625 obj->set_ident(_next_ident++);
626 }
627
628 static ciObjectFactory::NonPermObject* emptyBucket = NULL;
629
630 // ------------------------------------------------------------------
631 // ciObjectFactory::find_non_perm
632 //
633 // Use a small hash table, hashed on the klass of the key.
634 // If there is no entry in the cache corresponding to this oop, return
635 // the null tail of the bucket into which the oop should be inserted.
636 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
637 assert(Universe::heap()->is_in(key), "must be");
638 ciMetadata* klass = get_metadata(key->klass());
639 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
640 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) {
641 if (is_equal(p, key)) break;
642 }
643 return (*bp);
644 }
645
646
647
648 // ------------------------------------------------------------------
649 // Code for for NonPermObject
650 //
651 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
652 assert(ciObjectFactory::is_initialized(), "");
653 _object = object;
654 _next = bucket;
655 bucket = this;
656 }
657
658
659
660 // ------------------------------------------------------------------
661 // ciObjectFactory::insert_non_perm
662 //
663 // Insert a ciObject into the non-perm table.
664 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
665 assert(Universe::heap()->is_in_or_null(key), "must be");
666 assert(&where != &emptyBucket, "must not try to fill empty bucket");
667 NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
668 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
669 assert(find_non_perm(key) == p, "must find the same spot");
670 ++_non_perm_count;
671 }
672
673 // ------------------------------------------------------------------
674 // ciObjectFactory::vm_symbol_at
675 // Get the ciSymbol corresponding to some index in vmSymbols.
676 ciSymbol* ciObjectFactory::vm_symbol_at(vmSymbolID sid) {
677 int index = vmSymbols::as_int(sid);
678 return _shared_ci_symbols[index];
679 }
680
681 // ------------------------------------------------------------------
682 // ciObjectFactory::metadata_do
683 void ciObjectFactory::metadata_do(MetadataClosure* f) {
684 for (int j = 0; j < _ci_metadata.length(); j++) {
685 Metadata* o = _ci_metadata.at(j)->constant_encoding();
686 f->do_metadata(o);
687 }
688 }
689
690 // ------------------------------------------------------------------
691 // ciObjectFactory::print_contents_impl
692 void ciObjectFactory::print_contents_impl() {
693 int len = _ci_metadata.length();
694 tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
695 for (int i = 0; i < len; i++) {
696 _ci_metadata.at(i)->print();
697 tty->cr();
698 }
699 }
700
701 // ------------------------------------------------------------------
702 // ciObjectFactory::print_contents
703 void ciObjectFactory::print_contents() {
704 print();
705 tty->cr();
706 GUARDED_VM_ENTRY(print_contents_impl();)
707 }
708
709 // ------------------------------------------------------------------
710 // ciObjectFactory::print
711 //
712 // Print debugging information about the object factory
713 void ciObjectFactory::print() {
714 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
715 _non_perm_count, _ci_metadata.length(), _unloaded_methods.length(),
716 _unloaded_instances.length(),
717 _unloaded_klasses.length());
718 }