ciInstanceKlass.cpp revision 3602:da91efe96a93
1/* 2 * Copyright (c) 1999, 2012, 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/ciField.hpp" 27#include "ci/ciInstance.hpp" 28#include "ci/ciInstanceKlass.hpp" 29#include "ci/ciUtilities.hpp" 30#include "classfile/systemDictionary.hpp" 31#include "memory/allocation.hpp" 32#include "memory/allocation.inline.hpp" 33#include "oops/oop.inline.hpp" 34#include "oops/fieldStreams.hpp" 35#include "runtime/fieldDescriptor.hpp" 36 37// ciInstanceKlass 38// 39// This class represents a Klass* in the HotSpot virtual machine 40// whose Klass part in an InstanceKlass. 41 42// ------------------------------------------------------------------ 43// ciInstanceKlass::ciInstanceKlass 44// 45// Loaded instance klass. 46ciInstanceKlass::ciInstanceKlass(KlassHandle h_k) : 47 ciKlass(h_k), _non_static_fields(NULL) 48{ 49 assert(get_Klass()->oop_is_instance(), "wrong type"); 50 assert(get_instanceKlass()->is_loaded(), "must be at least loaded"); 51 InstanceKlass* ik = get_instanceKlass(); 52 53 AccessFlags access_flags = ik->access_flags(); 54 _flags = ciFlags(access_flags); 55 _has_finalizer = access_flags.has_finalizer(); 56 _has_subklass = ik->subklass() != NULL; 57 _init_state = ik->init_state(); 58 _nonstatic_field_size = ik->nonstatic_field_size(); 59 _has_nonstatic_fields = ik->has_nonstatic_fields(); 60 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields: 61 62 _implementor = NULL; // we will fill these lazily 63 64 Thread *thread = Thread::current(); 65 if (ciObjectFactory::is_initialized()) { 66 _loader = JNIHandles::make_local(thread, ik->class_loader()); 67 _protection_domain = JNIHandles::make_local(thread, 68 ik->protection_domain()); 69 _is_shared = false; 70 } else { 71 Handle h_loader(thread, ik->class_loader()); 72 Handle h_protection_domain(thread, ik->protection_domain()); 73 _loader = JNIHandles::make_global(h_loader); 74 _protection_domain = JNIHandles::make_global(h_protection_domain); 75 _is_shared = true; 76 } 77 78 // Lazy fields get filled in only upon request. 79 _super = NULL; 80 _java_mirror = NULL; 81 82 if (is_shared()) { 83 if (h_k() != SystemDictionary::Object_klass()) { 84 super(); 85 } 86 //compute_nonstatic_fields(); // done outside of constructor 87 } 88 89 _field_cache = NULL; 90} 91 92// Version for unloaded classes: 93ciInstanceKlass::ciInstanceKlass(ciSymbol* name, 94 jobject loader, jobject protection_domain) 95 : ciKlass(name, T_OBJECT) 96{ 97 assert(name->byte_at(0) != '[', "not an instance klass"); 98 _init_state = (InstanceKlass::ClassState)0; 99 _nonstatic_field_size = -1; 100 _has_nonstatic_fields = false; 101 _nonstatic_fields = NULL; 102 _loader = loader; 103 _protection_domain = protection_domain; 104 _is_shared = false; 105 _super = NULL; 106 _java_mirror = NULL; 107 _field_cache = NULL; 108} 109 110 111 112// ------------------------------------------------------------------ 113// ciInstanceKlass::compute_shared_is_initialized 114void ciInstanceKlass::compute_shared_init_state() { 115 GUARDED_VM_ENTRY( 116 InstanceKlass* ik = get_instanceKlass(); 117 _init_state = ik->init_state(); 118 ) 119} 120 121// ------------------------------------------------------------------ 122// ciInstanceKlass::compute_shared_has_subklass 123bool ciInstanceKlass::compute_shared_has_subklass() { 124 GUARDED_VM_ENTRY( 125 InstanceKlass* ik = get_instanceKlass(); 126 _has_subklass = ik->subklass() != NULL; 127 return _has_subklass; 128 ) 129} 130 131// ------------------------------------------------------------------ 132// ciInstanceKlass::loader 133oop ciInstanceKlass::loader() { 134 ASSERT_IN_VM; 135 return JNIHandles::resolve(_loader); 136} 137 138// ------------------------------------------------------------------ 139// ciInstanceKlass::loader_handle 140jobject ciInstanceKlass::loader_handle() { 141 return _loader; 142} 143 144// ------------------------------------------------------------------ 145// ciInstanceKlass::protection_domain 146oop ciInstanceKlass::protection_domain() { 147 ASSERT_IN_VM; 148 return JNIHandles::resolve(_protection_domain); 149} 150 151// ------------------------------------------------------------------ 152// ciInstanceKlass::protection_domain_handle 153jobject ciInstanceKlass::protection_domain_handle() { 154 return _protection_domain; 155} 156 157// ------------------------------------------------------------------ 158// ciInstanceKlass::field_cache 159// 160// Get the field cache associated with this klass. 161ciConstantPoolCache* ciInstanceKlass::field_cache() { 162 if (is_shared()) { 163 return NULL; 164 } 165 if (_field_cache == NULL) { 166 assert(!is_java_lang_Object(), "Object has no fields"); 167 Arena* arena = CURRENT_ENV->arena(); 168 _field_cache = new (arena) ciConstantPoolCache(arena, 5); 169 } 170 return _field_cache; 171} 172 173// ------------------------------------------------------------------ 174// ciInstanceKlass::get_canonical_holder 175// 176ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) { 177 #ifdef ASSERT 178 if (!(offset >= 0 && offset < layout_helper())) { 179 tty->print("*** get_canonical_holder(%d) on ", offset); 180 this->print(); 181 tty->print_cr(" ***"); 182 }; 183 assert(offset >= 0 && offset < layout_helper(), "offset must be tame"); 184 #endif 185 186 if (offset < instanceOopDesc::base_offset_in_bytes()) { 187 // All header offsets belong properly to java/lang/Object. 188 return CURRENT_ENV->Object_klass(); 189 } 190 191 ciInstanceKlass* self = this; 192 for (;;) { 193 assert(self->is_loaded(), "must be loaded to have size"); 194 ciInstanceKlass* super = self->super(); 195 if (super == NULL || super->nof_nonstatic_fields() == 0 || 196 !super->contains_field_offset(offset)) { 197 return self; 198 } else { 199 self = super; // return super->get_canonical_holder(offset) 200 } 201 } 202} 203 204// ------------------------------------------------------------------ 205// ciInstanceKlass::is_java_lang_Object 206// 207// Is this klass java.lang.Object? 208bool ciInstanceKlass::is_java_lang_Object() const { 209 return equals(CURRENT_ENV->Object_klass()); 210} 211 212// ------------------------------------------------------------------ 213// ciInstanceKlass::uses_default_loader 214bool ciInstanceKlass::uses_default_loader() { 215 // Note: We do not need to resolve the handle or enter the VM 216 // in order to test null-ness. 217 return _loader == NULL; 218} 219 220// ------------------------------------------------------------------ 221// ciInstanceKlass::is_in_package 222// 223// Is this klass in the given package? 224bool ciInstanceKlass::is_in_package(const char* packagename, int len) { 225 // To avoid class loader mischief, this test always rejects application classes. 226 if (!uses_default_loader()) 227 return false; 228 GUARDED_VM_ENTRY( 229 return is_in_package_impl(packagename, len); 230 ) 231} 232 233bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) { 234 ASSERT_IN_VM; 235 236 // If packagename contains trailing '/' exclude it from the 237 // prefix-test since we test for it explicitly. 238 if (packagename[len - 1] == '/') 239 len--; 240 241 if (!name()->starts_with(packagename, len)) 242 return false; 243 244 // Test if the class name is something like "java/lang". 245 if ((len + 1) > name()->utf8_length()) 246 return false; 247 248 // Test for trailing '/' 249 if ((char) name()->byte_at(len) != '/') 250 return false; 251 252 // Make sure it's not actually in a subpackage: 253 if (name()->index_of_at(len+1, "/", 1) >= 0) 254 return false; 255 256 return true; 257} 258 259// ------------------------------------------------------------------ 260// ciInstanceKlass::print_impl 261// 262// Implementation of the print method. 263void ciInstanceKlass::print_impl(outputStream* st) { 264 ciKlass::print_impl(st); 265 GUARDED_VM_ENTRY(st->print(" loader=0x%x", (address)loader());) 266 if (is_loaded()) { 267 st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=", 268 bool_to_str(is_initialized()), 269 bool_to_str(has_finalizer()), 270 bool_to_str(has_subklass()), 271 layout_helper()); 272 273 _flags.print_klass_flags(); 274 275 if (_super) { 276 st->print(" super="); 277 _super->print_name(); 278 } 279 if (_java_mirror) { 280 st->print(" mirror=PRESENT"); 281 } 282 } else { 283 st->print(" loaded=false"); 284 } 285} 286 287// ------------------------------------------------------------------ 288// ciInstanceKlass::super 289// 290// Get the superklass of this klass. 291ciInstanceKlass* ciInstanceKlass::super() { 292 assert(is_loaded(), "must be loaded"); 293 if (_super == NULL && !is_java_lang_Object()) { 294 GUARDED_VM_ENTRY( 295 Klass* super_klass = get_instanceKlass()->super(); 296 _super = CURRENT_ENV->get_instance_klass(super_klass); 297 ) 298 } 299 return _super; 300} 301 302// ------------------------------------------------------------------ 303// ciInstanceKlass::java_mirror 304// 305// Get the instance of java.lang.Class corresponding to this klass. 306// Cache it on this->_java_mirror. 307ciInstance* ciInstanceKlass::java_mirror() { 308 if (is_shared()) { 309 return ciKlass::java_mirror(); 310 } 311 if (_java_mirror == NULL) { 312 _java_mirror = ciKlass::java_mirror(); 313 } 314 return _java_mirror; 315} 316 317// ------------------------------------------------------------------ 318// ciInstanceKlass::unique_concrete_subklass 319ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() { 320 if (!is_loaded()) return NULL; // No change if class is not loaded 321 if (!is_abstract()) return NULL; // Only applies to abstract classes. 322 if (!has_subklass()) return NULL; // Must have at least one subklass. 323 VM_ENTRY_MARK; 324 InstanceKlass* ik = get_instanceKlass(); 325 Klass* up = ik->up_cast_abstract(); 326 assert(up->oop_is_instance(), "must be InstanceKlass"); 327 if (ik == up) { 328 return NULL; 329 } 330 return CURRENT_THREAD_ENV->get_instance_klass(up); 331} 332 333// ------------------------------------------------------------------ 334// ciInstanceKlass::has_finalizable_subclass 335bool ciInstanceKlass::has_finalizable_subclass() { 336 if (!is_loaded()) return true; 337 VM_ENTRY_MARK; 338 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL; 339} 340 341// ------------------------------------------------------------------ 342// ciInstanceKlass::get_field_by_offset 343ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) { 344 if (!is_static) { 345 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) { 346 ciField* field = _nonstatic_fields->at(i); 347 int field_off = field->offset_in_bytes(); 348 if (field_off == field_offset) 349 return field; 350 if (field_off > field_offset) 351 break; 352 // could do binary search or check bins, but probably not worth it 353 } 354 return NULL; 355 } 356 VM_ENTRY_MARK; 357 InstanceKlass* k = get_instanceKlass(); 358 fieldDescriptor fd; 359 if (!k->find_field_from_offset(field_offset, is_static, &fd)) { 360 return NULL; 361 } 362 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd); 363 return field; 364} 365 366// ------------------------------------------------------------------ 367// ciInstanceKlass::get_field_by_name 368ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) { 369 VM_ENTRY_MARK; 370 InstanceKlass* k = get_instanceKlass(); 371 fieldDescriptor fd; 372 Klass* def = k->find_field(name->get_symbol(), signature->get_symbol(), is_static, &fd); 373 if (def == NULL) { 374 return NULL; 375 } 376 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd); 377 return field; 378} 379 380// ------------------------------------------------------------------ 381// ciInstanceKlass::non_static_fields. 382 383class NonStaticFieldFiller: public FieldClosure { 384 GrowableArray<ciField*>* _arr; 385 ciEnv* _curEnv; 386public: 387 NonStaticFieldFiller(ciEnv* curEnv, GrowableArray<ciField*>* arr) : 388 _curEnv(curEnv), _arr(arr) 389 {} 390 void do_field(fieldDescriptor* fd) { 391 ciField* field = new (_curEnv->arena()) ciField(fd); 392 _arr->append(field); 393 } 394}; 395 396GrowableArray<ciField*>* ciInstanceKlass::non_static_fields() { 397 if (_non_static_fields == NULL) { 398 VM_ENTRY_MARK; 399 ciEnv* curEnv = ciEnv::current(); 400 InstanceKlass* ik = get_instanceKlass(); 401 int max_n_fields = ik->java_fields_count(); 402 403 Arena* arena = curEnv->arena(); 404 _non_static_fields = 405 new (arena) GrowableArray<ciField*>(arena, max_n_fields, 0, NULL); 406 NonStaticFieldFiller filler(curEnv, _non_static_fields); 407 ik->do_nonstatic_fields(&filler); 408 } 409 return _non_static_fields; 410} 411 412static int sort_field_by_offset(ciField** a, ciField** b) { 413 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes(); 414 // (no worries about 32-bit overflow...) 415} 416 417// ------------------------------------------------------------------ 418// ciInstanceKlass::compute_nonstatic_fields 419int ciInstanceKlass::compute_nonstatic_fields() { 420 assert(is_loaded(), "must be loaded"); 421 422 if (_nonstatic_fields != NULL) 423 return _nonstatic_fields->length(); 424 425 if (!has_nonstatic_fields()) { 426 Arena* arena = CURRENT_ENV->arena(); 427 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL); 428 return 0; 429 } 430 assert(!is_java_lang_Object(), "bootstrap OK"); 431 432 // Size in bytes of my fields, including inherited fields. 433 int fsize = nonstatic_field_size() * heapOopSize; 434 435 ciInstanceKlass* super = this->super(); 436 GrowableArray<ciField*>* super_fields = NULL; 437 if (super != NULL && super->has_nonstatic_fields()) { 438 int super_fsize = super->nonstatic_field_size() * heapOopSize; 439 int super_flen = super->nof_nonstatic_fields(); 440 super_fields = super->_nonstatic_fields; 441 assert(super_flen == 0 || super_fields != NULL, "first get nof_fields"); 442 // See if I am no larger than my super; if so, I can use his fields. 443 if (fsize == super_fsize) { 444 _nonstatic_fields = super_fields; 445 return super_fields->length(); 446 } 447 } 448 449 GrowableArray<ciField*>* fields = NULL; 450 GUARDED_VM_ENTRY({ 451 fields = compute_nonstatic_fields_impl(super_fields); 452 }); 453 454 if (fields == NULL) { 455 // This can happen if this class (java.lang.Class) has invisible fields. 456 _nonstatic_fields = super_fields; 457 return super_fields->length(); 458 } 459 460 int flen = fields->length(); 461 462 // Now sort them by offset, ascending. 463 // (In principle, they could mix with superclass fields.) 464 fields->sort(sort_field_by_offset); 465 _nonstatic_fields = fields; 466 return flen; 467} 468 469GrowableArray<ciField*>* 470ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>* 471 super_fields) { 472 ASSERT_IN_VM; 473 Arena* arena = CURRENT_ENV->arena(); 474 int flen = 0; 475 GrowableArray<ciField*>* fields = NULL; 476 InstanceKlass* k = get_instanceKlass(); 477 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 478 if (fs.access_flags().is_static()) continue; 479 flen += 1; 480 } 481 482 // allocate the array: 483 if (flen == 0) { 484 return NULL; // return nothing if none are locally declared 485 } 486 if (super_fields != NULL) { 487 flen += super_fields->length(); 488 } 489 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL); 490 if (super_fields != NULL) { 491 fields->appendAll(super_fields); 492 } 493 494 for (JavaFieldStream fs(k); !fs.done(); fs.next()) { 495 if (fs.access_flags().is_static()) continue; 496 fieldDescriptor fd; 497 fd.initialize(k, fs.index()); 498 ciField* field = new (arena) ciField(&fd); 499 fields->append(field); 500 } 501 assert(fields->length() == flen, "sanity"); 502 return fields; 503} 504 505// ------------------------------------------------------------------ 506// ciInstanceKlass::find_method 507// 508// Find a method in this klass. 509ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) { 510 VM_ENTRY_MARK; 511 InstanceKlass* k = get_instanceKlass(); 512 Symbol* name_sym = name->get_symbol(); 513 Symbol* sig_sym= signature->get_symbol(); 514 515 Method* m = k->find_method(name_sym, sig_sym); 516 if (m == NULL) return NULL; 517 518 return CURRENT_THREAD_ENV->get_method(m); 519} 520 521// ------------------------------------------------------------------ 522// ciInstanceKlass::is_leaf_type 523bool ciInstanceKlass::is_leaf_type() { 524 assert(is_loaded(), "must be loaded"); 525 if (is_shared()) { 526 return is_final(); // approximately correct 527 } else { 528 return !_has_subklass && (nof_implementors() == 0); 529 } 530} 531 532// ------------------------------------------------------------------ 533// ciInstanceKlass::implementor 534// 535// Report an implementor of this interface. 536// Note that there are various races here, since my copy 537// of _nof_implementors might be out of date with respect 538// to results returned by InstanceKlass::implementor. 539// This is OK, since any dependencies we decide to assert 540// will be checked later under the Compile_lock. 541ciInstanceKlass* ciInstanceKlass::implementor() { 542 ciInstanceKlass* impl = _implementor; 543 if (impl == NULL) { 544 // Go into the VM to fetch the implementor. 545 { 546 VM_ENTRY_MARK; 547 Klass* k = get_instanceKlass()->implementor(); 548 if (k != NULL) { 549 if (k == get_instanceKlass()) { 550 // More than one implementors. Use 'this' in this case. 551 impl = this; 552 } else { 553 impl = CURRENT_THREAD_ENV->get_instance_klass(k); 554 } 555 } 556 } 557 // Memoize this result. 558 if (!is_shared()) { 559 _implementor = impl; 560 } 561 } 562 return impl; 563} 564