annotate hotspot/src/share/vm/ci/ciInstanceKlass.cpp @ 4450:6d700b859b3e

6892658: C2 should optimize some stringbuilder patterns Reviewed-by: kvn, twisti
author never
date Thu, 12 Nov 2009 09:24:21 -0800
parents ddf3e9583f2f
children 7fc02fbe5c7a
rev   line source
duke@1 1 /*
xdono@670 2 * Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved.
duke@1 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@1 4 *
duke@1 5 * This code is free software; you can redistribute it and/or modify it
duke@1 6 * under the terms of the GNU General Public License version 2 only, as
duke@1 7 * published by the Free Software Foundation.
duke@1 8 *
duke@1 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@1 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@1 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@1 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@1 13 * accompanied this code).
duke@1 14 *
duke@1 15 * You should have received a copy of the GNU General Public License version
duke@1 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@1 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@1 18 *
duke@1 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@1 20 * CA 95054 USA or visit www.sun.com if you need additional information or
duke@1 21 * have any questions.
duke@1 22 *
duke@1 23 */
duke@1 24
duke@1 25 #include "incls/_precompiled.incl"
duke@1 26 #include "incls/_ciInstanceKlass.cpp.incl"
duke@1 27
duke@1 28 // ciInstanceKlass
duke@1 29 //
duke@1 30 // This class represents a klassOop in the HotSpot virtual machine
duke@1 31 // whose Klass part in an instanceKlass.
duke@1 32
duke@1 33 // ------------------------------------------------------------------
duke@1 34 // ciInstanceKlass::ciInstanceKlass
duke@1 35 //
duke@1 36 // Loaded instance klass.
kvn@217 37 ciInstanceKlass::ciInstanceKlass(KlassHandle h_k) :
kvn@217 38 ciKlass(h_k), _non_static_fields(NULL)
kvn@217 39 {
duke@1 40 assert(get_Klass()->oop_is_instance(), "wrong type");
duke@1 41 instanceKlass* ik = get_instanceKlass();
duke@1 42
duke@1 43 AccessFlags access_flags = ik->access_flags();
duke@1 44 _flags = ciFlags(access_flags);
duke@1 45 _has_finalizer = access_flags.has_finalizer();
duke@1 46 _has_subklass = ik->subklass() != NULL;
duke@1 47 _is_initialized = ik->is_initialized();
duke@1 48 // Next line must follow and use the result of the previous line:
duke@1 49 _is_linked = _is_initialized || ik->is_linked();
duke@1 50 _nonstatic_field_size = ik->nonstatic_field_size();
coleenp@360 51 _has_nonstatic_fields = ik->has_nonstatic_fields();
duke@1 52 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields:
duke@1 53
duke@1 54 _nof_implementors = ik->nof_implementors();
duke@1 55 for (int i = 0; i < implementors_limit; i++) {
duke@1 56 _implementors[i] = NULL; // we will fill these lazily
duke@1 57 }
duke@1 58
duke@1 59 Thread *thread = Thread::current();
duke@1 60 if (ciObjectFactory::is_initialized()) {
duke@1 61 _loader = JNIHandles::make_local(thread, ik->class_loader());
duke@1 62 _protection_domain = JNIHandles::make_local(thread,
duke@1 63 ik->protection_domain());
duke@1 64 _is_shared = false;
duke@1 65 } else {
duke@1 66 Handle h_loader(thread, ik->class_loader());
duke@1 67 Handle h_protection_domain(thread, ik->protection_domain());
duke@1 68 _loader = JNIHandles::make_global(h_loader);
duke@1 69 _protection_domain = JNIHandles::make_global(h_protection_domain);
duke@1 70 _is_shared = true;
duke@1 71 }
duke@1 72
duke@1 73 // Lazy fields get filled in only upon request.
duke@1 74 _super = NULL;
duke@1 75 _java_mirror = NULL;
duke@1 76
duke@1 77 if (is_shared()) {
duke@1 78 if (h_k() != SystemDictionary::object_klass()) {
duke@1 79 super();
duke@1 80 }
duke@1 81 java_mirror();
duke@1 82 //compute_nonstatic_fields(); // done outside of constructor
duke@1 83 }
duke@1 84
duke@1 85 _field_cache = NULL;
duke@1 86 }
duke@1 87
duke@1 88 // Version for unloaded classes:
duke@1 89 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
duke@1 90 jobject loader, jobject protection_domain)
duke@1 91 : ciKlass(name, ciInstanceKlassKlass::make())
duke@1 92 {
duke@1 93 assert(name->byte_at(0) != '[', "not an instance klass");
duke@1 94 _is_initialized = false;
duke@1 95 _is_linked = false;
duke@1 96 _nonstatic_field_size = -1;
coleenp@360 97 _has_nonstatic_fields = false;
duke@1 98 _nonstatic_fields = NULL;
duke@1 99 _nof_implementors = -1;
duke@1 100 _loader = loader;
duke@1 101 _protection_domain = protection_domain;
duke@1 102 _is_shared = false;
duke@1 103 _super = NULL;
duke@1 104 _java_mirror = NULL;
duke@1 105 _field_cache = NULL;
duke@1 106 }
duke@1 107
duke@1 108
duke@1 109
duke@1 110 // ------------------------------------------------------------------
duke@1 111 // ciInstanceKlass::compute_shared_is_initialized
duke@1 112 bool ciInstanceKlass::compute_shared_is_initialized() {
duke@1 113 GUARDED_VM_ENTRY(
duke@1 114 instanceKlass* ik = get_instanceKlass();
duke@1 115 _is_initialized = ik->is_initialized();
duke@1 116 return _is_initialized;
duke@1 117 )
duke@1 118 }
duke@1 119
duke@1 120 // ------------------------------------------------------------------
duke@1 121 // ciInstanceKlass::compute_shared_is_linked
duke@1 122 bool ciInstanceKlass::compute_shared_is_linked() {
duke@1 123 GUARDED_VM_ENTRY(
duke@1 124 instanceKlass* ik = get_instanceKlass();
duke@1 125 _is_linked = ik->is_linked();
duke@1 126 return _is_linked;
duke@1 127 )
duke@1 128 }
duke@1 129
duke@1 130 // ------------------------------------------------------------------
duke@1 131 // ciInstanceKlass::compute_shared_has_subklass
duke@1 132 bool ciInstanceKlass::compute_shared_has_subklass() {
duke@1 133 GUARDED_VM_ENTRY(
duke@1 134 instanceKlass* ik = get_instanceKlass();
duke@1 135 _has_subklass = ik->subklass() != NULL;
duke@1 136 return _has_subklass;
duke@1 137 )
duke@1 138 }
duke@1 139
duke@1 140 // ------------------------------------------------------------------
duke@1 141 // ciInstanceKlass::compute_shared_nof_implementors
duke@1 142 int ciInstanceKlass::compute_shared_nof_implementors() {
duke@1 143 // We requery this property, since it is a very old ciObject.
duke@1 144 GUARDED_VM_ENTRY(
duke@1 145 instanceKlass* ik = get_instanceKlass();
duke@1 146 _nof_implementors = ik->nof_implementors();
duke@1 147 return _nof_implementors;
duke@1 148 )
duke@1 149 }
duke@1 150
duke@1 151 // ------------------------------------------------------------------
duke@1 152 // ciInstanceKlass::loader
duke@1 153 oop ciInstanceKlass::loader() {
duke@1 154 ASSERT_IN_VM;
duke@1 155 return JNIHandles::resolve(_loader);
duke@1 156 }
duke@1 157
duke@1 158 // ------------------------------------------------------------------
duke@1 159 // ciInstanceKlass::loader_handle
duke@1 160 jobject ciInstanceKlass::loader_handle() {
duke@1 161 return _loader;
duke@1 162 }
duke@1 163
duke@1 164 // ------------------------------------------------------------------
duke@1 165 // ciInstanceKlass::protection_domain
duke@1 166 oop ciInstanceKlass::protection_domain() {
duke@1 167 ASSERT_IN_VM;
duke@1 168 return JNIHandles::resolve(_protection_domain);
duke@1 169 }
duke@1 170
duke@1 171 // ------------------------------------------------------------------
duke@1 172 // ciInstanceKlass::protection_domain_handle
duke@1 173 jobject ciInstanceKlass::protection_domain_handle() {
duke@1 174 return _protection_domain;
duke@1 175 }
duke@1 176
duke@1 177 // ------------------------------------------------------------------
duke@1 178 // ciInstanceKlass::field_cache
duke@1 179 //
duke@1 180 // Get the field cache associated with this klass.
duke@1 181 ciConstantPoolCache* ciInstanceKlass::field_cache() {
duke@1 182 if (is_shared()) {
duke@1 183 return NULL;
duke@1 184 }
duke@1 185 if (_field_cache == NULL) {
duke@1 186 assert(!is_java_lang_Object(), "Object has no fields");
duke@1 187 Arena* arena = CURRENT_ENV->arena();
duke@1 188 _field_cache = new (arena) ciConstantPoolCache(arena, 5);
duke@1 189 }
duke@1 190 return _field_cache;
duke@1 191 }
duke@1 192
duke@1 193 // ------------------------------------------------------------------
duke@1 194 // ciInstanceKlass::get_canonical_holder
duke@1 195 //
duke@1 196 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
duke@1 197 #ifdef ASSERT
duke@1 198 if (!(offset >= 0 && offset < layout_helper())) {
duke@1 199 tty->print("*** get_canonical_holder(%d) on ", offset);
duke@1 200 this->print();
duke@1 201 tty->print_cr(" ***");
duke@1 202 };
duke@1 203 assert(offset >= 0 && offset < layout_helper(), "offset must be tame");
duke@1 204 #endif
duke@1 205
coleenp@360 206 if (offset < instanceOopDesc::base_offset_in_bytes()) {
duke@1 207 // All header offsets belong properly to java/lang/Object.
duke@1 208 return CURRENT_ENV->Object_klass();
duke@1 209 }
duke@1 210
duke@1 211 ciInstanceKlass* self = this;
duke@1 212 for (;;) {
duke@1 213 assert(self->is_loaded(), "must be loaded to have size");
duke@1 214 ciInstanceKlass* super = self->super();
coleenp@360 215 if (super == NULL || super->nof_nonstatic_fields() == 0 ||
coleenp@360 216 !super->contains_field_offset(offset)) {
duke@1 217 return self;
duke@1 218 } else {
duke@1 219 self = super; // return super->get_canonical_holder(offset)
duke@1 220 }
duke@1 221 }
duke@1 222 }
duke@1 223
duke@1 224 // ------------------------------------------------------------------
duke@1 225 // ciInstanceKlass::is_java_lang_Object
duke@1 226 //
duke@1 227 // Is this klass java.lang.Object?
duke@1 228 bool ciInstanceKlass::is_java_lang_Object() {
duke@1 229 return equals(CURRENT_ENV->Object_klass());
duke@1 230 }
duke@1 231
duke@1 232 // ------------------------------------------------------------------
duke@1 233 // ciInstanceKlass::uses_default_loader
duke@1 234 bool ciInstanceKlass::uses_default_loader() {
duke@1 235 VM_ENTRY_MARK;
duke@1 236 return loader() == NULL;
duke@1 237 }
duke@1 238
duke@1 239 // ------------------------------------------------------------------
duke@1 240 // ciInstanceKlass::print_impl
duke@1 241 //
duke@1 242 // Implementation of the print method.
duke@1 243 void ciInstanceKlass::print_impl(outputStream* st) {
duke@1 244 ciKlass::print_impl(st);
duke@1 245 GUARDED_VM_ENTRY(st->print(" loader=0x%x", (address)loader());)
duke@1 246 if (is_loaded()) {
duke@1 247 st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=",
duke@1 248 bool_to_str(is_initialized()),
duke@1 249 bool_to_str(has_finalizer()),
duke@1 250 bool_to_str(has_subklass()),
duke@1 251 layout_helper());
duke@1 252
duke@1 253 _flags.print_klass_flags();
duke@1 254
duke@1 255 if (_super) {
duke@1 256 st->print(" super=");
duke@1 257 _super->print_name();
duke@1 258 }
duke@1 259 if (_java_mirror) {
duke@1 260 st->print(" mirror=PRESENT");
duke@1 261 }
duke@1 262 } else {
duke@1 263 st->print(" loaded=false");
duke@1 264 }
duke@1 265 }
duke@1 266
duke@1 267 // ------------------------------------------------------------------
duke@1 268 // ciInstanceKlass::super
duke@1 269 //
duke@1 270 // Get the superklass of this klass.
duke@1 271 ciInstanceKlass* ciInstanceKlass::super() {
duke@1 272 assert(is_loaded(), "must be loaded");
duke@1 273 if (_super == NULL && !is_java_lang_Object()) {
duke@1 274 GUARDED_VM_ENTRY(
duke@1 275 klassOop super_klass = get_instanceKlass()->super();
duke@1 276 _super = CURRENT_ENV->get_object(super_klass)->as_instance_klass();
duke@1 277 )
duke@1 278 }
duke@1 279 return _super;
duke@1 280 }
duke@1 281
duke@1 282 // ------------------------------------------------------------------
duke@1 283 // ciInstanceKlass::java_mirror
duke@1 284 //
duke@1 285 // Get the instance of java.lang.Class corresponding to this klass.
duke@1 286 ciInstance* ciInstanceKlass::java_mirror() {
duke@1 287 assert(is_loaded(), "must be loaded");
duke@1 288 if (_java_mirror == NULL) {
duke@1 289 _java_mirror = ciKlass::java_mirror();
duke@1 290 }
duke@1 291 return _java_mirror;
duke@1 292 }
duke@1 293
duke@1 294 // ------------------------------------------------------------------
duke@1 295 // ciInstanceKlass::unique_concrete_subklass
duke@1 296 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
duke@1 297 if (!is_loaded()) return NULL; // No change if class is not loaded
duke@1 298 if (!is_abstract()) return NULL; // Only applies to abstract classes.
duke@1 299 if (!has_subklass()) return NULL; // Must have at least one subklass.
duke@1 300 VM_ENTRY_MARK;
duke@1 301 instanceKlass* ik = get_instanceKlass();
duke@1 302 Klass* up = ik->up_cast_abstract();
duke@1 303 assert(up->oop_is_instance(), "must be instanceKlass");
duke@1 304 if (ik == up) {
duke@1 305 return NULL;
duke@1 306 }
duke@1 307 return CURRENT_THREAD_ENV->get_object(up->as_klassOop())->as_instance_klass();
duke@1 308 }
duke@1 309
duke@1 310 // ------------------------------------------------------------------
duke@1 311 // ciInstanceKlass::has_finalizable_subclass
duke@1 312 bool ciInstanceKlass::has_finalizable_subclass() {
duke@1 313 if (!is_loaded()) return true;
duke@1 314 VM_ENTRY_MARK;
duke@1 315 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL;
duke@1 316 }
duke@1 317
duke@1 318 // ------------------------------------------------------------------
duke@1 319 // ciInstanceKlass::get_field_by_offset
duke@1 320 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
duke@1 321 if (!is_static) {
duke@1 322 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
duke@1 323 ciField* field = _nonstatic_fields->at(i);
duke@1 324 int field_off = field->offset_in_bytes();
duke@1 325 if (field_off == field_offset)
duke@1 326 return field;
duke@1 327 if (field_off > field_offset)
duke@1 328 break;
duke@1 329 // could do binary search or check bins, but probably not worth it
duke@1 330 }
duke@1 331 return NULL;
duke@1 332 }
duke@1 333 VM_ENTRY_MARK;
duke@1 334 instanceKlass* k = get_instanceKlass();
duke@1 335 fieldDescriptor fd;
duke@1 336 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
duke@1 337 return NULL;
duke@1 338 }
duke@1 339 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
duke@1 340 return field;
duke@1 341 }
duke@1 342
kvn@217 343 // ------------------------------------------------------------------
never@4450 344 // ciInstanceKlass::get_field_by_name
never@4450 345 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
never@4450 346 VM_ENTRY_MARK;
never@4450 347 instanceKlass* k = get_instanceKlass();
never@4450 348 fieldDescriptor fd;
never@4450 349 klassOop def = k->find_field(name->get_symbolOop(), signature->get_symbolOop(), is_static, &fd);
never@4450 350 if (def == NULL) {
never@4450 351 return NULL;
never@4450 352 }
never@4450 353 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
never@4450 354 return field;
never@4450 355 }
never@4450 356
never@4450 357 // ------------------------------------------------------------------
kvn@217 358 // ciInstanceKlass::non_static_fields.
kvn@217 359
kvn@217 360 class NonStaticFieldFiller: public FieldClosure {
kvn@217 361 GrowableArray<ciField*>* _arr;
kvn@217 362 ciEnv* _curEnv;
kvn@217 363 public:
kvn@217 364 NonStaticFieldFiller(ciEnv* curEnv, GrowableArray<ciField*>* arr) :
kvn@217 365 _curEnv(curEnv), _arr(arr)
kvn@217 366 {}
kvn@217 367 void do_field(fieldDescriptor* fd) {
kvn@217 368 ciField* field = new (_curEnv->arena()) ciField(fd);
kvn@217 369 _arr->append(field);
kvn@217 370 }
kvn@217 371 };
kvn@217 372
kvn@217 373 GrowableArray<ciField*>* ciInstanceKlass::non_static_fields() {
kvn@217 374 if (_non_static_fields == NULL) {
kvn@217 375 VM_ENTRY_MARK;
kvn@217 376 ciEnv* curEnv = ciEnv::current();
kvn@217 377 instanceKlass* ik = get_instanceKlass();
kvn@217 378 int max_n_fields = ik->fields()->length()/instanceKlass::next_offset;
kvn@217 379
kvn@217 380 _non_static_fields =
kvn@217 381 new (curEnv->arena()) GrowableArray<ciField*>(max_n_fields);
kvn@217 382 NonStaticFieldFiller filler(curEnv, _non_static_fields);
kvn@217 383 ik->do_nonstatic_fields(&filler);
kvn@217 384 }
kvn@217 385 return _non_static_fields;
kvn@217 386 }
kvn@217 387
duke@1 388 static int sort_field_by_offset(ciField** a, ciField** b) {
duke@1 389 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
duke@1 390 // (no worries about 32-bit overflow...)
duke@1 391 }
duke@1 392
duke@1 393 // ------------------------------------------------------------------
duke@1 394 // ciInstanceKlass::compute_nonstatic_fields
duke@1 395 int ciInstanceKlass::compute_nonstatic_fields() {
duke@1 396 assert(is_loaded(), "must be loaded");
duke@1 397
duke@1 398 if (_nonstatic_fields != NULL)
duke@1 399 return _nonstatic_fields->length();
duke@1 400
coleenp@360 401 if (!has_nonstatic_fields()) {
duke@1 402 Arena* arena = CURRENT_ENV->arena();
duke@1 403 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL);
duke@1 404 return 0;
duke@1 405 }
duke@1 406 assert(!is_java_lang_Object(), "bootstrap OK");
duke@1 407
coleenp@360 408 // Size in bytes of my fields, including inherited fields.
kvn@591 409 int fsize = nonstatic_field_size() * heapOopSize;
coleenp@360 410
duke@1 411 ciInstanceKlass* super = this->super();
duke@1 412 GrowableArray<ciField*>* super_fields = NULL;
coleenp@360 413 if (super != NULL && super->has_nonstatic_fields()) {
kvn@591 414 int super_fsize = super->nonstatic_field_size() * heapOopSize;
coleenp@360 415 int super_flen = super->nof_nonstatic_fields();
duke@1 416 super_fields = super->_nonstatic_fields;
duke@1 417 assert(super_flen == 0 || super_fields != NULL, "first get nof_fields");
coleenp@360 418 // See if I am no larger than my super; if so, I can use his fields.
coleenp@360 419 if (fsize == super_fsize) {
coleenp@360 420 _nonstatic_fields = super_fields;
coleenp@360 421 return super_fields->length();
coleenp@360 422 }
duke@1 423 }
duke@1 424
duke@1 425 GrowableArray<ciField*>* fields = NULL;
duke@1 426 GUARDED_VM_ENTRY({
duke@1 427 fields = compute_nonstatic_fields_impl(super_fields);
duke@1 428 });
duke@1 429
duke@1 430 if (fields == NULL) {
duke@1 431 // This can happen if this class (java.lang.Class) has invisible fields.
duke@1 432 _nonstatic_fields = super_fields;
duke@1 433 return super_fields->length();
duke@1 434 }
duke@1 435
duke@1 436 int flen = fields->length();
duke@1 437
duke@1 438 // Now sort them by offset, ascending.
duke@1 439 // (In principle, they could mix with superclass fields.)
duke@1 440 fields->sort(sort_field_by_offset);
duke@1 441 #ifdef ASSERT
coleenp@360 442 int last_offset = instanceOopDesc::base_offset_in_bytes();
duke@1 443 for (int i = 0; i < fields->length(); i++) {
duke@1 444 ciField* field = fields->at(i);
duke@1 445 int offset = field->offset_in_bytes();
coleenp@360 446 int size = (field->_type == NULL) ? heapOopSize : field->size_in_bytes();
duke@1 447 assert(last_offset <= offset, "no field overlap");
duke@1 448 if (last_offset > (int)sizeof(oopDesc))
duke@1 449 assert((offset - last_offset) < BytesPerLong, "no big holes");
duke@1 450 // Note: Two consecutive T_BYTE fields will be separated by wordSize-1
duke@1 451 // padding bytes if one of them is declared by a superclass.
duke@1 452 // This is a minor inefficiency classFileParser.cpp.
duke@1 453 last_offset = offset + size;
duke@1 454 }
kvn@591 455 assert(last_offset <= (int)instanceOopDesc::base_offset_in_bytes() + fsize, "no overflow");
duke@1 456 #endif
duke@1 457
duke@1 458 _nonstatic_fields = fields;
duke@1 459 return flen;
duke@1 460 }
duke@1 461
duke@1 462 GrowableArray<ciField*>*
duke@1 463 ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>*
duke@1 464 super_fields) {
duke@1 465 ASSERT_IN_VM;
duke@1 466 Arena* arena = CURRENT_ENV->arena();
duke@1 467 int flen = 0;
duke@1 468 GrowableArray<ciField*>* fields = NULL;
duke@1 469 instanceKlass* k = get_instanceKlass();
duke@1 470 typeArrayOop fields_array = k->fields();
duke@1 471 for (int pass = 0; pass <= 1; pass++) {
duke@1 472 for (int i = 0, alen = fields_array->length(); i < alen; i += instanceKlass::next_offset) {
duke@1 473 fieldDescriptor fd;
duke@1 474 fd.initialize(k->as_klassOop(), i);
duke@1 475 if (fd.is_static()) continue;
duke@1 476 if (pass == 0) {
duke@1 477 flen += 1;
duke@1 478 } else {
duke@1 479 ciField* field = new (arena) ciField(&fd);
duke@1 480 fields->append(field);
duke@1 481 }
duke@1 482 }
duke@1 483
duke@1 484 // Between passes, allocate the array:
duke@1 485 if (pass == 0) {
duke@1 486 if (flen == 0) {
duke@1 487 return NULL; // return nothing if none are locally declared
duke@1 488 }
duke@1 489 if (super_fields != NULL) {
duke@1 490 flen += super_fields->length();
duke@1 491 }
duke@1 492 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL);
duke@1 493 if (super_fields != NULL) {
duke@1 494 fields->appendAll(super_fields);
duke@1 495 }
duke@1 496 }
duke@1 497 }
duke@1 498 assert(fields->length() == flen, "sanity");
duke@1 499 return fields;
duke@1 500 }
duke@1 501
duke@1 502 // ------------------------------------------------------------------
duke@1 503 // ciInstanceKlass::find_method
duke@1 504 //
duke@1 505 // Find a method in this klass.
duke@1 506 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
duke@1 507 VM_ENTRY_MARK;
duke@1 508 instanceKlass* k = get_instanceKlass();
duke@1 509 symbolOop name_sym = name->get_symbolOop();
duke@1 510 symbolOop sig_sym= signature->get_symbolOop();
duke@1 511
duke@1 512 methodOop m = k->find_method(name_sym, sig_sym);
duke@1 513 if (m == NULL) return NULL;
duke@1 514
duke@1 515 return CURRENT_THREAD_ENV->get_object(m)->as_method();
duke@1 516 }
duke@1 517
duke@1 518 // ------------------------------------------------------------------
duke@1 519 // ciInstanceKlass::is_leaf_type
duke@1 520 bool ciInstanceKlass::is_leaf_type() {
duke@1 521 assert(is_loaded(), "must be loaded");
duke@1 522 if (is_shared()) {
duke@1 523 return is_final(); // approximately correct
duke@1 524 } else {
duke@1 525 return !_has_subklass && (_nof_implementors == 0);
duke@1 526 }
duke@1 527 }
duke@1 528
duke@1 529 // ------------------------------------------------------------------
duke@1 530 // ciInstanceKlass::implementor
duke@1 531 //
duke@1 532 // Report an implementor of this interface.
duke@1 533 // Returns NULL if exact information is not available.
duke@1 534 // Note that there are various races here, since my copy
duke@1 535 // of _nof_implementors might be out of date with respect
duke@1 536 // to results returned by instanceKlass::implementor.
duke@1 537 // This is OK, since any dependencies we decide to assert
duke@1 538 // will be checked later under the Compile_lock.
duke@1 539 ciInstanceKlass* ciInstanceKlass::implementor(int n) {
duke@1 540 if (n > implementors_limit) {
duke@1 541 return NULL;
duke@1 542 }
duke@1 543 ciInstanceKlass* impl = _implementors[n];
duke@1 544 if (impl == NULL) {
duke@1 545 if (_nof_implementors > implementors_limit) {
duke@1 546 return NULL;
duke@1 547 }
duke@1 548 // Go into the VM to fetch the implementor.
duke@1 549 {
duke@1 550 VM_ENTRY_MARK;
duke@1 551 klassOop k = get_instanceKlass()->implementor(n);
duke@1 552 if (k != NULL) {
duke@1 553 impl = CURRENT_THREAD_ENV->get_object(k)->as_instance_klass();
duke@1 554 }
duke@1 555 }
duke@1 556 // Memoize this result.
duke@1 557 if (!is_shared()) {
duke@1 558 _implementors[n] = (impl == NULL)? this: impl;
duke@1 559 }
duke@1 560 } else if (impl == this) {
duke@1 561 impl = NULL; // memoized null result from a VM query
duke@1 562 }
duke@1 563 return impl;
duke@1 564 }