|
1 /* |
|
2 * Copyright 1999-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
|
20 * CA 95054 USA or visit www.sun.com if you need additional information or |
|
21 * have any questions. |
|
22 * |
|
23 */ |
|
24 |
|
25 #include "incls/_precompiled.incl" |
|
26 #include "incls/_ciInstanceKlass.cpp.incl" |
|
27 |
|
28 // ciInstanceKlass |
|
29 // |
|
30 // This class represents a klassOop in the HotSpot virtual machine |
|
31 // whose Klass part in an instanceKlass. |
|
32 |
|
33 // ------------------------------------------------------------------ |
|
34 // ciInstanceKlass::ciInstanceKlass |
|
35 // |
|
36 // Loaded instance klass. |
|
37 ciInstanceKlass::ciInstanceKlass(KlassHandle h_k) : ciKlass(h_k) { |
|
38 assert(get_Klass()->oop_is_instance(), "wrong type"); |
|
39 instanceKlass* ik = get_instanceKlass(); |
|
40 |
|
41 AccessFlags access_flags = ik->access_flags(); |
|
42 _flags = ciFlags(access_flags); |
|
43 _has_finalizer = access_flags.has_finalizer(); |
|
44 _has_subklass = ik->subklass() != NULL; |
|
45 _is_initialized = ik->is_initialized(); |
|
46 // Next line must follow and use the result of the previous line: |
|
47 _is_linked = _is_initialized || ik->is_linked(); |
|
48 _nonstatic_field_size = ik->nonstatic_field_size(); |
|
49 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields: |
|
50 |
|
51 _nof_implementors = ik->nof_implementors(); |
|
52 for (int i = 0; i < implementors_limit; i++) { |
|
53 _implementors[i] = NULL; // we will fill these lazily |
|
54 } |
|
55 |
|
56 Thread *thread = Thread::current(); |
|
57 if (ciObjectFactory::is_initialized()) { |
|
58 _loader = JNIHandles::make_local(thread, ik->class_loader()); |
|
59 _protection_domain = JNIHandles::make_local(thread, |
|
60 ik->protection_domain()); |
|
61 _is_shared = false; |
|
62 } else { |
|
63 Handle h_loader(thread, ik->class_loader()); |
|
64 Handle h_protection_domain(thread, ik->protection_domain()); |
|
65 _loader = JNIHandles::make_global(h_loader); |
|
66 _protection_domain = JNIHandles::make_global(h_protection_domain); |
|
67 _is_shared = true; |
|
68 } |
|
69 |
|
70 // Lazy fields get filled in only upon request. |
|
71 _super = NULL; |
|
72 _java_mirror = NULL; |
|
73 |
|
74 if (is_shared()) { |
|
75 if (h_k() != SystemDictionary::object_klass()) { |
|
76 super(); |
|
77 } |
|
78 java_mirror(); |
|
79 //compute_nonstatic_fields(); // done outside of constructor |
|
80 } |
|
81 |
|
82 _field_cache = NULL; |
|
83 } |
|
84 |
|
85 // Version for unloaded classes: |
|
86 ciInstanceKlass::ciInstanceKlass(ciSymbol* name, |
|
87 jobject loader, jobject protection_domain) |
|
88 : ciKlass(name, ciInstanceKlassKlass::make()) |
|
89 { |
|
90 assert(name->byte_at(0) != '[', "not an instance klass"); |
|
91 _is_initialized = false; |
|
92 _is_linked = false; |
|
93 _nonstatic_field_size = -1; |
|
94 _nonstatic_fields = NULL; |
|
95 _nof_implementors = -1; |
|
96 _loader = loader; |
|
97 _protection_domain = protection_domain; |
|
98 _is_shared = false; |
|
99 _super = NULL; |
|
100 _java_mirror = NULL; |
|
101 _field_cache = NULL; |
|
102 } |
|
103 |
|
104 |
|
105 |
|
106 // ------------------------------------------------------------------ |
|
107 // ciInstanceKlass::compute_shared_is_initialized |
|
108 bool ciInstanceKlass::compute_shared_is_initialized() { |
|
109 GUARDED_VM_ENTRY( |
|
110 instanceKlass* ik = get_instanceKlass(); |
|
111 _is_initialized = ik->is_initialized(); |
|
112 return _is_initialized; |
|
113 ) |
|
114 } |
|
115 |
|
116 // ------------------------------------------------------------------ |
|
117 // ciInstanceKlass::compute_shared_is_linked |
|
118 bool ciInstanceKlass::compute_shared_is_linked() { |
|
119 GUARDED_VM_ENTRY( |
|
120 instanceKlass* ik = get_instanceKlass(); |
|
121 _is_linked = ik->is_linked(); |
|
122 return _is_linked; |
|
123 ) |
|
124 } |
|
125 |
|
126 // ------------------------------------------------------------------ |
|
127 // ciInstanceKlass::compute_shared_has_subklass |
|
128 bool ciInstanceKlass::compute_shared_has_subklass() { |
|
129 GUARDED_VM_ENTRY( |
|
130 instanceKlass* ik = get_instanceKlass(); |
|
131 _has_subklass = ik->subklass() != NULL; |
|
132 return _has_subklass; |
|
133 ) |
|
134 } |
|
135 |
|
136 // ------------------------------------------------------------------ |
|
137 // ciInstanceKlass::compute_shared_nof_implementors |
|
138 int ciInstanceKlass::compute_shared_nof_implementors() { |
|
139 // We requery this property, since it is a very old ciObject. |
|
140 GUARDED_VM_ENTRY( |
|
141 instanceKlass* ik = get_instanceKlass(); |
|
142 _nof_implementors = ik->nof_implementors(); |
|
143 return _nof_implementors; |
|
144 ) |
|
145 } |
|
146 |
|
147 // ------------------------------------------------------------------ |
|
148 // ciInstanceKlass::loader |
|
149 oop ciInstanceKlass::loader() { |
|
150 ASSERT_IN_VM; |
|
151 return JNIHandles::resolve(_loader); |
|
152 } |
|
153 |
|
154 // ------------------------------------------------------------------ |
|
155 // ciInstanceKlass::loader_handle |
|
156 jobject ciInstanceKlass::loader_handle() { |
|
157 return _loader; |
|
158 } |
|
159 |
|
160 // ------------------------------------------------------------------ |
|
161 // ciInstanceKlass::protection_domain |
|
162 oop ciInstanceKlass::protection_domain() { |
|
163 ASSERT_IN_VM; |
|
164 return JNIHandles::resolve(_protection_domain); |
|
165 } |
|
166 |
|
167 // ------------------------------------------------------------------ |
|
168 // ciInstanceKlass::protection_domain_handle |
|
169 jobject ciInstanceKlass::protection_domain_handle() { |
|
170 return _protection_domain; |
|
171 } |
|
172 |
|
173 // ------------------------------------------------------------------ |
|
174 // ciInstanceKlass::field_cache |
|
175 // |
|
176 // Get the field cache associated with this klass. |
|
177 ciConstantPoolCache* ciInstanceKlass::field_cache() { |
|
178 if (is_shared()) { |
|
179 return NULL; |
|
180 } |
|
181 if (_field_cache == NULL) { |
|
182 assert(!is_java_lang_Object(), "Object has no fields"); |
|
183 Arena* arena = CURRENT_ENV->arena(); |
|
184 _field_cache = new (arena) ciConstantPoolCache(arena, 5); |
|
185 } |
|
186 return _field_cache; |
|
187 } |
|
188 |
|
189 // ------------------------------------------------------------------ |
|
190 // ciInstanceKlass::get_canonical_holder |
|
191 // |
|
192 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) { |
|
193 #ifdef ASSERT |
|
194 if (!(offset >= 0 && offset < layout_helper())) { |
|
195 tty->print("*** get_canonical_holder(%d) on ", offset); |
|
196 this->print(); |
|
197 tty->print_cr(" ***"); |
|
198 }; |
|
199 assert(offset >= 0 && offset < layout_helper(), "offset must be tame"); |
|
200 #endif |
|
201 |
|
202 if (offset < (instanceOopDesc::header_size() * wordSize)) { |
|
203 // All header offsets belong properly to java/lang/Object. |
|
204 return CURRENT_ENV->Object_klass(); |
|
205 } |
|
206 |
|
207 ciInstanceKlass* self = this; |
|
208 for (;;) { |
|
209 assert(self->is_loaded(), "must be loaded to have size"); |
|
210 ciInstanceKlass* super = self->super(); |
|
211 if (super == NULL || !super->contains_field_offset(offset)) { |
|
212 return self; |
|
213 } else { |
|
214 self = super; // return super->get_canonical_holder(offset) |
|
215 } |
|
216 } |
|
217 } |
|
218 |
|
219 // ------------------------------------------------------------------ |
|
220 // ciInstanceKlass::is_java_lang_Object |
|
221 // |
|
222 // Is this klass java.lang.Object? |
|
223 bool ciInstanceKlass::is_java_lang_Object() { |
|
224 return equals(CURRENT_ENV->Object_klass()); |
|
225 } |
|
226 |
|
227 // ------------------------------------------------------------------ |
|
228 // ciInstanceKlass::uses_default_loader |
|
229 bool ciInstanceKlass::uses_default_loader() { |
|
230 VM_ENTRY_MARK; |
|
231 return loader() == NULL; |
|
232 } |
|
233 |
|
234 // ------------------------------------------------------------------ |
|
235 // ciInstanceKlass::print_impl |
|
236 // |
|
237 // Implementation of the print method. |
|
238 void ciInstanceKlass::print_impl(outputStream* st) { |
|
239 ciKlass::print_impl(st); |
|
240 GUARDED_VM_ENTRY(st->print(" loader=0x%x", (address)loader());) |
|
241 if (is_loaded()) { |
|
242 st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=", |
|
243 bool_to_str(is_initialized()), |
|
244 bool_to_str(has_finalizer()), |
|
245 bool_to_str(has_subklass()), |
|
246 layout_helper()); |
|
247 |
|
248 _flags.print_klass_flags(); |
|
249 |
|
250 if (_super) { |
|
251 st->print(" super="); |
|
252 _super->print_name(); |
|
253 } |
|
254 if (_java_mirror) { |
|
255 st->print(" mirror=PRESENT"); |
|
256 } |
|
257 } else { |
|
258 st->print(" loaded=false"); |
|
259 } |
|
260 } |
|
261 |
|
262 // ------------------------------------------------------------------ |
|
263 // ciInstanceKlass::super |
|
264 // |
|
265 // Get the superklass of this klass. |
|
266 ciInstanceKlass* ciInstanceKlass::super() { |
|
267 assert(is_loaded(), "must be loaded"); |
|
268 if (_super == NULL && !is_java_lang_Object()) { |
|
269 GUARDED_VM_ENTRY( |
|
270 klassOop super_klass = get_instanceKlass()->super(); |
|
271 _super = CURRENT_ENV->get_object(super_klass)->as_instance_klass(); |
|
272 ) |
|
273 } |
|
274 return _super; |
|
275 } |
|
276 |
|
277 // ------------------------------------------------------------------ |
|
278 // ciInstanceKlass::java_mirror |
|
279 // |
|
280 // Get the instance of java.lang.Class corresponding to this klass. |
|
281 ciInstance* ciInstanceKlass::java_mirror() { |
|
282 assert(is_loaded(), "must be loaded"); |
|
283 if (_java_mirror == NULL) { |
|
284 _java_mirror = ciKlass::java_mirror(); |
|
285 } |
|
286 return _java_mirror; |
|
287 } |
|
288 |
|
289 // ------------------------------------------------------------------ |
|
290 // ciInstanceKlass::unique_concrete_subklass |
|
291 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() { |
|
292 if (!is_loaded()) return NULL; // No change if class is not loaded |
|
293 if (!is_abstract()) return NULL; // Only applies to abstract classes. |
|
294 if (!has_subklass()) return NULL; // Must have at least one subklass. |
|
295 VM_ENTRY_MARK; |
|
296 instanceKlass* ik = get_instanceKlass(); |
|
297 Klass* up = ik->up_cast_abstract(); |
|
298 assert(up->oop_is_instance(), "must be instanceKlass"); |
|
299 if (ik == up) { |
|
300 return NULL; |
|
301 } |
|
302 return CURRENT_THREAD_ENV->get_object(up->as_klassOop())->as_instance_klass(); |
|
303 } |
|
304 |
|
305 // ------------------------------------------------------------------ |
|
306 // ciInstanceKlass::has_finalizable_subclass |
|
307 bool ciInstanceKlass::has_finalizable_subclass() { |
|
308 if (!is_loaded()) return true; |
|
309 VM_ENTRY_MARK; |
|
310 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL; |
|
311 } |
|
312 |
|
313 // ------------------------------------------------------------------ |
|
314 // ciInstanceKlass::get_field_by_offset |
|
315 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) { |
|
316 if (!is_static) { |
|
317 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) { |
|
318 ciField* field = _nonstatic_fields->at(i); |
|
319 int field_off = field->offset_in_bytes(); |
|
320 if (field_off == field_offset) |
|
321 return field; |
|
322 if (field_off > field_offset) |
|
323 break; |
|
324 // could do binary search or check bins, but probably not worth it |
|
325 } |
|
326 return NULL; |
|
327 } |
|
328 VM_ENTRY_MARK; |
|
329 instanceKlass* k = get_instanceKlass(); |
|
330 fieldDescriptor fd; |
|
331 if (!k->find_field_from_offset(field_offset, is_static, &fd)) { |
|
332 return NULL; |
|
333 } |
|
334 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd); |
|
335 return field; |
|
336 } |
|
337 |
|
338 static int sort_field_by_offset(ciField** a, ciField** b) { |
|
339 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes(); |
|
340 // (no worries about 32-bit overflow...) |
|
341 } |
|
342 |
|
343 // ------------------------------------------------------------------ |
|
344 // ciInstanceKlass::compute_nonstatic_fields |
|
345 int ciInstanceKlass::compute_nonstatic_fields() { |
|
346 assert(is_loaded(), "must be loaded"); |
|
347 |
|
348 if (_nonstatic_fields != NULL) |
|
349 return _nonstatic_fields->length(); |
|
350 |
|
351 // Size in bytes of my fields, including inherited fields. |
|
352 // About equal to size_helper() - sizeof(oopDesc). |
|
353 int fsize = nonstatic_field_size() * wordSize; |
|
354 if (fsize == 0) { // easy shortcut |
|
355 Arena* arena = CURRENT_ENV->arena(); |
|
356 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL); |
|
357 return 0; |
|
358 } |
|
359 assert(!is_java_lang_Object(), "bootstrap OK"); |
|
360 |
|
361 ciInstanceKlass* super = this->super(); |
|
362 int super_fsize = 0; |
|
363 int super_flen = 0; |
|
364 GrowableArray<ciField*>* super_fields = NULL; |
|
365 if (super != NULL) { |
|
366 super_fsize = super->nonstatic_field_size() * wordSize; |
|
367 super_flen = super->nof_nonstatic_fields(); |
|
368 super_fields = super->_nonstatic_fields; |
|
369 assert(super_flen == 0 || super_fields != NULL, "first get nof_fields"); |
|
370 } |
|
371 |
|
372 // See if I am no larger than my super; if so, I can use his fields. |
|
373 if (fsize == super_fsize) { |
|
374 _nonstatic_fields = super_fields; |
|
375 return super_fields->length(); |
|
376 } |
|
377 |
|
378 GrowableArray<ciField*>* fields = NULL; |
|
379 GUARDED_VM_ENTRY({ |
|
380 fields = compute_nonstatic_fields_impl(super_fields); |
|
381 }); |
|
382 |
|
383 if (fields == NULL) { |
|
384 // This can happen if this class (java.lang.Class) has invisible fields. |
|
385 _nonstatic_fields = super_fields; |
|
386 return super_fields->length(); |
|
387 } |
|
388 |
|
389 int flen = fields->length(); |
|
390 |
|
391 // Now sort them by offset, ascending. |
|
392 // (In principle, they could mix with superclass fields.) |
|
393 fields->sort(sort_field_by_offset); |
|
394 #ifdef ASSERT |
|
395 int last_offset = sizeof(oopDesc); |
|
396 for (int i = 0; i < fields->length(); i++) { |
|
397 ciField* field = fields->at(i); |
|
398 int offset = field->offset_in_bytes(); |
|
399 int size = (field->_type == NULL) ? oopSize : field->size_in_bytes(); |
|
400 assert(last_offset <= offset, "no field overlap"); |
|
401 if (last_offset > (int)sizeof(oopDesc)) |
|
402 assert((offset - last_offset) < BytesPerLong, "no big holes"); |
|
403 // Note: Two consecutive T_BYTE fields will be separated by wordSize-1 |
|
404 // padding bytes if one of them is declared by a superclass. |
|
405 // This is a minor inefficiency classFileParser.cpp. |
|
406 last_offset = offset + size; |
|
407 } |
|
408 assert(last_offset <= (int)sizeof(oopDesc) + fsize, "no overflow"); |
|
409 #endif |
|
410 |
|
411 _nonstatic_fields = fields; |
|
412 return flen; |
|
413 } |
|
414 |
|
415 GrowableArray<ciField*>* |
|
416 ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>* |
|
417 super_fields) { |
|
418 ASSERT_IN_VM; |
|
419 Arena* arena = CURRENT_ENV->arena(); |
|
420 int flen = 0; |
|
421 GrowableArray<ciField*>* fields = NULL; |
|
422 instanceKlass* k = get_instanceKlass(); |
|
423 typeArrayOop fields_array = k->fields(); |
|
424 for (int pass = 0; pass <= 1; pass++) { |
|
425 for (int i = 0, alen = fields_array->length(); i < alen; i += instanceKlass::next_offset) { |
|
426 fieldDescriptor fd; |
|
427 fd.initialize(k->as_klassOop(), i); |
|
428 if (fd.is_static()) continue; |
|
429 if (pass == 0) { |
|
430 flen += 1; |
|
431 } else { |
|
432 ciField* field = new (arena) ciField(&fd); |
|
433 fields->append(field); |
|
434 } |
|
435 } |
|
436 |
|
437 // Between passes, allocate the array: |
|
438 if (pass == 0) { |
|
439 if (flen == 0) { |
|
440 return NULL; // return nothing if none are locally declared |
|
441 } |
|
442 if (super_fields != NULL) { |
|
443 flen += super_fields->length(); |
|
444 } |
|
445 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL); |
|
446 if (super_fields != NULL) { |
|
447 fields->appendAll(super_fields); |
|
448 } |
|
449 } |
|
450 } |
|
451 assert(fields->length() == flen, "sanity"); |
|
452 return fields; |
|
453 } |
|
454 |
|
455 // ------------------------------------------------------------------ |
|
456 // ciInstanceKlass::find_method |
|
457 // |
|
458 // Find a method in this klass. |
|
459 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) { |
|
460 VM_ENTRY_MARK; |
|
461 instanceKlass* k = get_instanceKlass(); |
|
462 symbolOop name_sym = name->get_symbolOop(); |
|
463 symbolOop sig_sym= signature->get_symbolOop(); |
|
464 |
|
465 methodOop m = k->find_method(name_sym, sig_sym); |
|
466 if (m == NULL) return NULL; |
|
467 |
|
468 return CURRENT_THREAD_ENV->get_object(m)->as_method(); |
|
469 } |
|
470 |
|
471 // ------------------------------------------------------------------ |
|
472 // ciInstanceKlass::is_leaf_type |
|
473 bool ciInstanceKlass::is_leaf_type() { |
|
474 assert(is_loaded(), "must be loaded"); |
|
475 if (is_shared()) { |
|
476 return is_final(); // approximately correct |
|
477 } else { |
|
478 return !_has_subklass && (_nof_implementors == 0); |
|
479 } |
|
480 } |
|
481 |
|
482 // ------------------------------------------------------------------ |
|
483 // ciInstanceKlass::implementor |
|
484 // |
|
485 // Report an implementor of this interface. |
|
486 // Returns NULL if exact information is not available. |
|
487 // Note that there are various races here, since my copy |
|
488 // of _nof_implementors might be out of date with respect |
|
489 // to results returned by instanceKlass::implementor. |
|
490 // This is OK, since any dependencies we decide to assert |
|
491 // will be checked later under the Compile_lock. |
|
492 ciInstanceKlass* ciInstanceKlass::implementor(int n) { |
|
493 if (n > implementors_limit) { |
|
494 return NULL; |
|
495 } |
|
496 ciInstanceKlass* impl = _implementors[n]; |
|
497 if (impl == NULL) { |
|
498 if (_nof_implementors > implementors_limit) { |
|
499 return NULL; |
|
500 } |
|
501 // Go into the VM to fetch the implementor. |
|
502 { |
|
503 VM_ENTRY_MARK; |
|
504 klassOop k = get_instanceKlass()->implementor(n); |
|
505 if (k != NULL) { |
|
506 impl = CURRENT_THREAD_ENV->get_object(k)->as_instance_klass(); |
|
507 } |
|
508 } |
|
509 // Memoize this result. |
|
510 if (!is_shared()) { |
|
511 _implementors[n] = (impl == NULL)? this: impl; |
|
512 } |
|
513 } else if (impl == this) { |
|
514 impl = NULL; // memoized null result from a VM query |
|
515 } |
|
516 return impl; |
|
517 } |