rev 1083 : code cache unloading for webrev 091214 rev 1085 : checkpoint unloading changes on 100107
1 /* 2 * Copyright 1999-2009 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/_ciEnv.cpp.incl" 27 28 // ciEnv 29 // 30 // This class is the top level broker for requests from the compiler 31 // to the VM. 32 33 ciObject* ciEnv::_null_object_instance; 34 ciMethodKlass* ciEnv::_method_klass_instance; 35 ciSymbolKlass* ciEnv::_symbol_klass_instance; 36 ciKlassKlass* ciEnv::_klass_klass_instance; 37 ciInstanceKlassKlass* ciEnv::_instance_klass_klass_instance; 38 ciTypeArrayKlassKlass* ciEnv::_type_array_klass_klass_instance; 39 ciObjArrayKlassKlass* ciEnv::_obj_array_klass_klass_instance; 40 41 ciInstanceKlass* ciEnv::_ArrayStoreException; 42 ciInstanceKlass* ciEnv::_Class; 43 ciInstanceKlass* ciEnv::_ClassCastException; 44 ciInstanceKlass* ciEnv::_Object; 45 ciInstanceKlass* ciEnv::_Throwable; 46 ciInstanceKlass* ciEnv::_Thread; 47 ciInstanceKlass* ciEnv::_OutOfMemoryError; 48 ciInstanceKlass* ciEnv::_String; 49 ciInstanceKlass* ciEnv::_StringBuffer; 50 ciInstanceKlass* ciEnv::_StringBuilder; 51 ciInstanceKlass* ciEnv::_Integer; 52 53 ciSymbol* ciEnv::_unloaded_cisymbol = NULL; 54 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL; 55 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL; 56 57 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL; 58 jobject ciEnv::_ArrayStoreException_handle = NULL; 59 jobject ciEnv::_ClassCastException_handle = NULL; 60 61 #ifndef PRODUCT 62 static bool firstEnv = true; 63 #endif /* PRODUCT */ 64 65 // ------------------------------------------------------------------ 66 // ciEnv::ciEnv 67 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) { 68 VM_ENTRY_MARK; 69 70 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc. 71 thread->set_env(this); 72 assert(ciEnv::current() == this, "sanity"); 73 74 _oop_recorder = NULL; 75 _debug_info = NULL; 76 _dependencies = NULL; 77 _failure_reason = NULL; 78 _compilable = MethodCompilable; 79 _break_at_compile = false; 80 _compiler_data = NULL; 81 #ifndef PRODUCT 82 assert(!firstEnv, "not initialized properly"); 83 #endif /* !PRODUCT */ 84 85 _system_dictionary_modification_counter = system_dictionary_modification_counter; 86 _num_inlined_bytecodes = 0; 87 assert(task == NULL || thread->task() == task, "sanity"); 88 _task = task; 89 _log = NULL; 90 91 // Temporary buffer for creating symbols and such. 92 _name_buffer = NULL; 93 _name_buffer_len = 0; 94 95 _arena = &_ciEnv_arena; 96 _factory = new (_arena) ciObjectFactory(_arena, 128); 97 98 // Preload commonly referenced system ciObjects. 99 100 // During VM initialization, these instances have not yet been created. 101 // Assertions ensure that these instances are not accessed before 102 // their initialization. 103 104 assert(Universe::is_fully_initialized(), "should be complete"); 105 106 oop o = Universe::null_ptr_exception_instance(); 107 assert(o != NULL, "should have been initialized"); 108 _NullPointerException_instance = get_object(o)->as_instance(); 109 o = Universe::arithmetic_exception_instance(); 110 assert(o != NULL, "should have been initialized"); 111 _ArithmeticException_instance = get_object(o)->as_instance(); 112 113 _ArrayIndexOutOfBoundsException_instance = NULL; 114 _ArrayStoreException_instance = NULL; 115 _ClassCastException_instance = NULL; 116 _the_null_string = NULL; 117 _the_min_jint_string = NULL; 118 } 119 120 ciEnv::ciEnv(Arena* arena) { 121 ASSERT_IN_VM; 122 123 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc. 124 CompilerThread* current_thread = CompilerThread::current(); 125 assert(current_thread->env() == NULL, "must be"); 126 current_thread->set_env(this); 127 assert(ciEnv::current() == this, "sanity"); 128 129 _oop_recorder = NULL; 130 _debug_info = NULL; 131 _dependencies = NULL; 132 _failure_reason = NULL; 133 _compilable = MethodCompilable_never; 134 _break_at_compile = false; 135 _compiler_data = NULL; 136 #ifndef PRODUCT 137 assert(firstEnv, "must be first"); 138 firstEnv = false; 139 #endif /* !PRODUCT */ 140 141 _system_dictionary_modification_counter = 0; 142 _num_inlined_bytecodes = 0; 143 _task = NULL; 144 _log = NULL; 145 146 // Temporary buffer for creating symbols and such. 147 _name_buffer = NULL; 148 _name_buffer_len = 0; 149 150 _arena = arena; 151 _factory = new (_arena) ciObjectFactory(_arena, 128); 152 153 // Preload commonly referenced system ciObjects. 154 155 // During VM initialization, these instances have not yet been created. 156 // Assertions ensure that these instances are not accessed before 157 // their initialization. 158 159 assert(Universe::is_fully_initialized(), "must be"); 160 161 oop o = Universe::null_ptr_exception_instance(); 162 assert(o != NULL, "should have been initialized"); 163 _NullPointerException_instance = get_object(o)->as_instance(); 164 o = Universe::arithmetic_exception_instance(); 165 assert(o != NULL, "should have been initialized"); 166 _ArithmeticException_instance = get_object(o)->as_instance(); 167 168 _ArrayIndexOutOfBoundsException_instance = NULL; 169 _ArrayStoreException_instance = NULL; 170 _ClassCastException_instance = NULL; 171 _the_null_string = NULL; 172 _the_min_jint_string = NULL; 173 } 174 175 ciEnv::~ciEnv() { 176 CompilerThread* current_thread = CompilerThread::current(); 177 current_thread->set_env(NULL); 178 } 179 180 // ------------------------------------------------------------------ 181 // Cache Jvmti state 182 void ciEnv::cache_jvmti_state() { 183 VM_ENTRY_MARK; 184 // Get Jvmti capabilities under lock to get consistant values. 185 MutexLocker mu(JvmtiThreadState_lock); 186 _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint(); 187 _jvmti_can_examine_or_deopt_anywhere = JvmtiExport::can_examine_or_deopt_anywhere(); 188 _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables(); 189 _jvmti_can_post_exceptions = JvmtiExport::can_post_exceptions(); 190 } 191 192 // ------------------------------------------------------------------ 193 // Cache DTrace flags 194 void ciEnv::cache_dtrace_flags() { 195 // Need lock? 196 _dtrace_extended_probes = ExtendedDTraceProbes; 197 if (_dtrace_extended_probes) { 198 _dtrace_monitor_probes = true; 199 _dtrace_method_probes = true; 200 _dtrace_alloc_probes = true; 201 } else { 202 _dtrace_monitor_probes = DTraceMonitorProbes; 203 _dtrace_method_probes = DTraceMethodProbes; 204 _dtrace_alloc_probes = DTraceAllocProbes; 205 } 206 } 207 208 // ------------------------------------------------------------------ 209 // helper for lazy exception creation 210 ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) { 211 VM_ENTRY_MARK; 212 if (handle == NULL) { 213 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance. 214 klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD); 215 jobject objh = NULL; 216 if (!HAS_PENDING_EXCEPTION && k != NULL) { 217 oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD); 218 if (!HAS_PENDING_EXCEPTION) 219 objh = JNIHandles::make_global(obj); 220 } 221 if (HAS_PENDING_EXCEPTION) { 222 CLEAR_PENDING_EXCEPTION; 223 } else { 224 handle = objh; 225 } 226 } 227 oop obj = JNIHandles::resolve(handle); 228 return obj == NULL? NULL: get_object(obj)->as_instance(); 229 } 230 231 // ------------------------------------------------------------------ 232 // ciEnv::ArrayIndexOutOfBoundsException_instance, etc. 233 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() { 234 if (_ArrayIndexOutOfBoundsException_instance == NULL) { 235 _ArrayIndexOutOfBoundsException_instance 236 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle, 237 vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException()); 238 } 239 return _ArrayIndexOutOfBoundsException_instance; 240 } 241 ciInstance* ciEnv::ArrayStoreException_instance() { 242 if (_ArrayStoreException_instance == NULL) { 243 _ArrayStoreException_instance 244 = get_or_create_exception(_ArrayStoreException_handle, 245 vmSymbolHandles::java_lang_ArrayStoreException()); 246 } 247 return _ArrayStoreException_instance; 248 } 249 ciInstance* ciEnv::ClassCastException_instance() { 250 if (_ClassCastException_instance == NULL) { 251 _ClassCastException_instance 252 = get_or_create_exception(_ClassCastException_handle, 253 vmSymbolHandles::java_lang_ClassCastException()); 254 } 255 return _ClassCastException_instance; 256 } 257 258 ciInstance* ciEnv::the_null_string() { 259 if (_the_null_string == NULL) { 260 VM_ENTRY_MARK; 261 _the_null_string = get_object(Universe::the_null_string())->as_instance(); 262 } 263 return _the_null_string; 264 } 265 266 ciInstance* ciEnv::the_min_jint_string() { 267 if (_the_min_jint_string == NULL) { 268 VM_ENTRY_MARK; 269 _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance(); 270 } 271 return _the_min_jint_string; 272 } 273 274 // ------------------------------------------------------------------ 275 // ciEnv::get_method_from_handle 276 ciMethod* ciEnv::get_method_from_handle(jobject method) { 277 VM_ENTRY_MARK; 278 return get_object(JNIHandles::resolve(method))->as_method(); 279 } 280 281 // ------------------------------------------------------------------ 282 // ciEnv::make_array 283 ciArray* ciEnv::make_system_array(GrowableArray<ciObject*>* objects) { 284 VM_ENTRY_MARK; 285 int length = objects->length(); 286 objArrayOop a = oopFactory::new_system_objArray(length, THREAD); 287 if (HAS_PENDING_EXCEPTION) { 288 CLEAR_PENDING_EXCEPTION; 289 record_out_of_memory_failure(); 290 return NULL; 291 } 292 for (int i = 0; i < length; i++) { 293 a->obj_at_put(i, objects->at(i)->get_oop()); 294 } 295 assert(a->is_perm(), ""); 296 return get_object(a)->as_array(); 297 } 298 299 300 // ------------------------------------------------------------------ 301 // ciEnv::array_element_offset_in_bytes 302 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) { 303 VM_ENTRY_MARK; 304 objArrayOop a = (objArrayOop)a_h->get_oop(); 305 assert(a->is_objArray(), ""); 306 int length = a->length(); 307 oop o = o_h->get_oop(); 308 for (int i = 0; i < length; i++) { 309 if (a->obj_at(i) == o) return i; 310 } 311 return -1; 312 } 313 314 315 // ------------------------------------------------------------------ 316 // ciEnv::check_klass_accessiblity 317 // 318 // Note: the logic of this method should mirror the logic of 319 // constantPoolOopDesc::verify_constant_pool_resolve. 320 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass, 321 klassOop resolved_klass) { 322 if (accessing_klass == NULL || !accessing_klass->is_loaded()) { 323 return true; 324 } 325 if (accessing_klass->is_obj_array()) { 326 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass(); 327 } 328 if (!accessing_klass->is_instance_klass()) { 329 return true; 330 } 331 332 if (resolved_klass->klass_part()->oop_is_objArray()) { 333 // Find the element klass, if this is an array. 334 resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass(); 335 } 336 if (resolved_klass->klass_part()->oop_is_instance()) { 337 return Reflection::verify_class_access(accessing_klass->get_klassOop(), 338 resolved_klass, 339 true); 340 } 341 return true; 342 } 343 344 // ------------------------------------------------------------------ 345 // ciEnv::get_klass_by_name_impl 346 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass, 347 ciSymbol* name, 348 bool require_local) { 349 ASSERT_IN_VM; 350 EXCEPTION_CONTEXT; 351 352 // Now we need to check the SystemDictionary 353 symbolHandle sym(THREAD, name->get_symbolOop()); 354 if (sym->byte_at(0) == 'L' && 355 sym->byte_at(sym->utf8_length()-1) == ';') { 356 // This is a name from a signature. Strip off the trimmings. 357 sym = oopFactory::new_symbol_handle(sym->as_utf8()+1, 358 sym->utf8_length()-2, 359 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass)); 360 name = get_object(sym())->as_symbol(); 361 } 362 363 // Check for prior unloaded klass. The SystemDictionary's answers 364 // can vary over time but the compiler needs consistency. 365 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name); 366 if (unloaded_klass != NULL) { 367 if (require_local) return NULL; 368 return unloaded_klass; 369 } 370 371 Handle loader(THREAD, (oop)NULL); 372 Handle domain(THREAD, (oop)NULL); 373 if (accessing_klass != NULL) { 374 loader = Handle(THREAD, accessing_klass->loader()); 375 domain = Handle(THREAD, accessing_klass->protection_domain()); 376 } 377 378 // setup up the proper type to return on OOM 379 ciKlass* fail_type; 380 if (sym->byte_at(0) == '[') { 381 fail_type = _unloaded_ciobjarrayklass; 382 } else { 383 fail_type = _unloaded_ciinstance_klass; 384 } 385 klassOop found_klass; 386 if (!require_local) { 387 found_klass = 388 SystemDictionary::find_constrained_instance_or_array_klass(sym, loader, 389 KILL_COMPILE_ON_FATAL_(fail_type)); 390 } else { 391 found_klass = 392 SystemDictionary::find_instance_or_array_klass(sym, loader, domain, 393 KILL_COMPILE_ON_FATAL_(fail_type)); 394 } 395 396 if (found_klass != NULL) { 397 // Found it. Build a CI handle. 398 return get_object(found_klass)->as_klass(); 399 } 400 401 // If we fail to find an array klass, look again for its element type. 402 // The element type may be available either locally or via constraints. 403 // In either case, if we can find the element type in the system dictionary, 404 // we must build an array type around it. The CI requires array klasses 405 // to be loaded if their element klasses are loaded, except when memory 406 // is exhausted. 407 if (sym->byte_at(0) == '[' && 408 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) { 409 // We have an unloaded array. 410 // Build it on the fly if the element class exists. 411 symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1, 412 sym->utf8_length()-1, 413 KILL_COMPILE_ON_FATAL_(fail_type)); 414 // Get element ciKlass recursively. 415 ciKlass* elem_klass = 416 get_klass_by_name_impl(accessing_klass, 417 get_object(elem_sym)->as_symbol(), 418 require_local); 419 if (elem_klass != NULL && elem_klass->is_loaded()) { 420 // Now make an array for it 421 return ciObjArrayKlass::make_impl(elem_klass); 422 } 423 } 424 425 if (require_local) return NULL; 426 // Not yet loaded into the VM, or not governed by loader constraints. 427 // Make a CI representative for it. 428 return get_unloaded_klass(accessing_klass, name); 429 } 430 431 // ------------------------------------------------------------------ 432 // ciEnv::get_klass_by_name 433 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass, 434 ciSymbol* klass_name, 435 bool require_local) { 436 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass, 437 klass_name, 438 require_local);) 439 } 440 441 // ------------------------------------------------------------------ 442 // ciEnv::get_klass_by_index_impl 443 // 444 // Implementation of get_klass_by_index. 445 ciKlass* ciEnv::get_klass_by_index_impl(ciInstanceKlass* accessor, 446 int index, 447 bool& is_accessible) { 448 assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool"); 449 EXCEPTION_CONTEXT; 450 constantPoolHandle cpool(THREAD, accessor->get_instanceKlass()->constants()); 451 KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index)); 452 symbolHandle klass_name; 453 if (klass.is_null()) { 454 // The klass has not been inserted into the constant pool. 455 // Try to look it up by name. 456 { 457 // We have to lock the cpool to keep the oop from being resolved 458 // while we are accessing it. 459 ObjectLocker ol(cpool, THREAD); 460 461 constantTag tag = cpool->tag_at(index); 462 if (tag.is_klass()) { 463 // The klass has been inserted into the constant pool 464 // very recently. 465 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index)); 466 } else if (tag.is_symbol()) { 467 klass_name = symbolHandle(THREAD, cpool->symbol_at(index)); 468 } else { 469 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag"); 470 klass_name = symbolHandle(THREAD, cpool->unresolved_klass_at(index)); 471 } 472 } 473 } 474 475 if (klass.is_null()) { 476 // Not found in constant pool. Use the name to do the lookup. 477 ciKlass* k = get_klass_by_name_impl(accessor, 478 get_object(klass_name())->as_symbol(), 479 false); 480 // Calculate accessibility the hard way. 481 if (!k->is_loaded()) { 482 is_accessible = false; 483 } else if (k->loader() != accessor->loader() && 484 get_klass_by_name_impl(accessor, k->name(), true) == NULL) { 485 // Loaded only remotely. Not linked yet. 486 is_accessible = false; 487 } else { 488 // Linked locally, and we must also check public/private, etc. 489 is_accessible = check_klass_accessibility(accessor, k->get_klassOop()); 490 } 491 return k; 492 } 493 494 // Check for prior unloaded klass. The SystemDictionary's answers 495 // can vary over time but the compiler needs consistency. 496 ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol(); 497 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name); 498 if (unloaded_klass != NULL) { 499 is_accessible = false; 500 return unloaded_klass; 501 } 502 503 // It is known to be accessible, since it was found in the constant pool. 504 is_accessible = true; 505 return get_object(klass())->as_klass(); 506 } 507 508 // ------------------------------------------------------------------ 509 // ciEnv::get_klass_by_index 510 // 511 // Get a klass from the constant pool. 512 ciKlass* ciEnv::get_klass_by_index(ciInstanceKlass* accessor, 513 int index, 514 bool& is_accessible) { 515 GUARDED_VM_ENTRY(return get_klass_by_index_impl(accessor, index, is_accessible);) 516 } 517 518 // ------------------------------------------------------------------ 519 // ciEnv::get_constant_by_index_impl 520 // 521 // Implementation of get_constant_by_index(). 522 ciConstant ciEnv::get_constant_by_index_impl(ciInstanceKlass* accessor, 523 int index) { 524 EXCEPTION_CONTEXT; 525 instanceKlass* ik_accessor = accessor->get_instanceKlass(); 526 assert(ik_accessor->is_linked(), "must be linked before accessing constant pool"); 527 constantPoolOop cpool = ik_accessor->constants(); 528 constantTag tag = cpool->tag_at(index); 529 if (tag.is_int()) { 530 return ciConstant(T_INT, (jint)cpool->int_at(index)); 531 } else if (tag.is_long()) { 532 return ciConstant((jlong)cpool->long_at(index)); 533 } else if (tag.is_float()) { 534 return ciConstant((jfloat)cpool->float_at(index)); 535 } else if (tag.is_double()) { 536 return ciConstant((jdouble)cpool->double_at(index)); 537 } else if (tag.is_string() || tag.is_unresolved_string()) { 538 oop string = NULL; 539 if (cpool->is_pseudo_string_at(index)) { 540 string = cpool->pseudo_string_at(index); 541 } else { 542 string = cpool->string_at(index, THREAD); 543 if (HAS_PENDING_EXCEPTION) { 544 CLEAR_PENDING_EXCEPTION; 545 record_out_of_memory_failure(); 546 return ciConstant(); 547 } 548 } 549 ciObject* constant = get_object(string); 550 assert (constant->is_instance(), "must be an instance, or not? "); 551 return ciConstant(T_OBJECT, constant); 552 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 553 // 4881222: allow ldc to take a class type 554 bool ignore; 555 ciKlass* klass = get_klass_by_index_impl(accessor, index, ignore); 556 if (HAS_PENDING_EXCEPTION) { 557 CLEAR_PENDING_EXCEPTION; 558 record_out_of_memory_failure(); 559 return ciConstant(); 560 } 561 assert (klass->is_instance_klass() || klass->is_array_klass(), 562 "must be an instance or array klass "); 563 return ciConstant(T_OBJECT, klass); 564 } else { 565 ShouldNotReachHere(); 566 return ciConstant(); 567 } 568 } 569 570 // ------------------------------------------------------------------ 571 // ciEnv::is_unresolved_string_impl 572 // 573 // Implementation of is_unresolved_string(). 574 bool ciEnv::is_unresolved_string_impl(instanceKlass* accessor, int index) const { 575 EXCEPTION_CONTEXT; 576 assert(accessor->is_linked(), "must be linked before accessing constant pool"); 577 constantPoolOop cpool = accessor->constants(); 578 constantTag tag = cpool->tag_at(index); 579 return tag.is_unresolved_string(); 580 } 581 582 // ------------------------------------------------------------------ 583 // ciEnv::is_unresolved_klass_impl 584 // 585 // Implementation of is_unresolved_klass(). 586 bool ciEnv::is_unresolved_klass_impl(instanceKlass* accessor, int index) const { 587 EXCEPTION_CONTEXT; 588 assert(accessor->is_linked(), "must be linked before accessing constant pool"); 589 constantPoolOop cpool = accessor->constants(); 590 constantTag tag = cpool->tag_at(index); 591 return tag.is_unresolved_klass(); 592 } 593 594 // ------------------------------------------------------------------ 595 // ciEnv::get_constant_by_index 596 // 597 // Pull a constant out of the constant pool. How appropriate. 598 // 599 // Implementation note: this query is currently in no way cached. 600 ciConstant ciEnv::get_constant_by_index(ciInstanceKlass* accessor, 601 int index) { 602 GUARDED_VM_ENTRY(return get_constant_by_index_impl(accessor, index); ) 603 } 604 605 // ------------------------------------------------------------------ 606 // ciEnv::is_unresolved_string 607 // 608 // Check constant pool 609 // 610 // Implementation note: this query is currently in no way cached. 611 bool ciEnv::is_unresolved_string(ciInstanceKlass* accessor, 612 int index) const { 613 GUARDED_VM_ENTRY(return is_unresolved_string_impl(accessor->get_instanceKlass(), index); ) 614 } 615 616 // ------------------------------------------------------------------ 617 // ciEnv::is_unresolved_klass 618 // 619 // Check constant pool 620 // 621 // Implementation note: this query is currently in no way cached. 622 bool ciEnv::is_unresolved_klass(ciInstanceKlass* accessor, 623 int index) const { 624 GUARDED_VM_ENTRY(return is_unresolved_klass_impl(accessor->get_instanceKlass(), index); ) 625 } 626 627 // ------------------------------------------------------------------ 628 // ciEnv::get_field_by_index_impl 629 // 630 // Implementation of get_field_by_index. 631 // 632 // Implementation note: the results of field lookups are cached 633 // in the accessor klass. 634 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor, 635 int index) { 636 ciConstantPoolCache* cache = accessor->field_cache(); 637 if (cache == NULL) { 638 ciField* field = new (arena()) ciField(accessor, index); 639 return field; 640 } else { 641 ciField* field = (ciField*)cache->get(index); 642 if (field == NULL) { 643 field = new (arena()) ciField(accessor, index); 644 cache->insert(index, field); 645 } 646 return field; 647 } 648 } 649 650 // ------------------------------------------------------------------ 651 // ciEnv::get_field_by_index 652 // 653 // Get a field by index from a klass's constant pool. 654 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor, 655 int index) { 656 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);) 657 } 658 659 // ------------------------------------------------------------------ 660 // ciEnv::lookup_method 661 // 662 // Perform an appropriate method lookup based on accessor, holder, 663 // name, signature, and bytecode. 664 methodOop ciEnv::lookup_method(instanceKlass* accessor, 665 instanceKlass* holder, 666 symbolOop name, 667 symbolOop sig, 668 Bytecodes::Code bc) { 669 EXCEPTION_CONTEXT; 670 KlassHandle h_accessor(THREAD, accessor); 671 KlassHandle h_holder(THREAD, holder); 672 symbolHandle h_name(THREAD, name); 673 symbolHandle h_sig(THREAD, sig); 674 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL)); 675 methodHandle dest_method; 676 switch (bc) { 677 case Bytecodes::_invokestatic: 678 dest_method = 679 LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor); 680 break; 681 case Bytecodes::_invokespecial: 682 dest_method = 683 LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor); 684 break; 685 case Bytecodes::_invokeinterface: 686 dest_method = 687 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig, 688 h_accessor, true); 689 break; 690 case Bytecodes::_invokevirtual: 691 dest_method = 692 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig, 693 h_accessor, true); 694 break; 695 default: ShouldNotReachHere(); 696 } 697 698 return dest_method(); 699 } 700 701 702 // ------------------------------------------------------------------ 703 // ciEnv::get_method_by_index_impl 704 ciMethod* ciEnv::get_method_by_index_impl(ciInstanceKlass* accessor, 705 int index, Bytecodes::Code bc) { 706 // Get the method's declared holder. 707 708 assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool"); 709 constantPoolHandle cpool = accessor->get_instanceKlass()->constants(); 710 int holder_index = cpool->klass_ref_index_at(index); 711 bool holder_is_accessible; 712 ciKlass* holder = get_klass_by_index_impl(accessor, holder_index, holder_is_accessible); 713 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder); 714 715 // Get the method's name and signature. 716 symbolOop name_sym = cpool->name_ref_at(index); 717 symbolOop sig_sym = cpool->signature_ref_at(index); 718 719 if (holder_is_accessible) { // Our declared holder is loaded. 720 instanceKlass* lookup = declared_holder->get_instanceKlass(); 721 methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc); 722 if (m != NULL) { 723 // We found the method. 724 return get_object(m)->as_method(); 725 } 726 } 727 728 // Either the declared holder was not loaded, or the method could 729 // not be found. Create a dummy ciMethod to represent the failed 730 // lookup. 731 732 return get_unloaded_method(declared_holder, 733 get_object(name_sym)->as_symbol(), 734 get_object(sig_sym)->as_symbol()); 735 } 736 737 738 // ------------------------------------------------------------------ 739 // ciEnv::get_instance_klass_for_declared_method_holder 740 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) { 741 // For the case of <array>.clone(), the method holder can be a ciArrayKlass 742 // instead of a ciInstanceKlass. For that case simply pretend that the 743 // declared holder is Object.clone since that's where the call will bottom out. 744 // A more correct fix would trickle out through many interfaces in CI, 745 // requiring ciInstanceKlass* to become ciKlass* and many more places would 746 // require checks to make sure the expected type was found. Given that this 747 // only occurs for clone() the more extensive fix seems like overkill so 748 // instead we simply smear the array type into Object. 749 if (method_holder->is_instance_klass()) { 750 return method_holder->as_instance_klass(); 751 } else if (method_holder->is_array_klass()) { 752 return current()->Object_klass(); 753 } else { 754 ShouldNotReachHere(); 755 } 756 return NULL; 757 } 758 759 760 761 762 // ------------------------------------------------------------------ 763 // ciEnv::get_method_by_index 764 ciMethod* ciEnv::get_method_by_index(ciInstanceKlass* accessor, 765 int index, Bytecodes::Code bc) { 766 GUARDED_VM_ENTRY(return get_method_by_index_impl(accessor, index, bc);) 767 } 768 769 // ------------------------------------------------------------------ 770 // ciEnv::name_buffer 771 char *ciEnv::name_buffer(int req_len) { 772 if (_name_buffer_len < req_len) { 773 if (_name_buffer == NULL) { 774 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len); 775 _name_buffer_len = req_len; 776 } else { 777 _name_buffer = 778 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len); 779 _name_buffer_len = req_len; 780 } 781 } 782 return _name_buffer; 783 } 784 785 // ------------------------------------------------------------------ 786 // ciEnv::is_in_vm 787 bool ciEnv::is_in_vm() { 788 return JavaThread::current()->thread_state() == _thread_in_vm; 789 } 790 791 bool ciEnv::system_dictionary_modification_counter_changed() { 792 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications(); 793 } 794 795 // ------------------------------------------------------------------ 796 // ciEnv::check_for_system_dictionary_modification 797 // Check for changes to the system dictionary during compilation 798 // class loads, evolution, breakpoints 799 void ciEnv::check_for_system_dictionary_modification(ciMethod* target) { 800 if (failing()) return; // no need for further checks 801 802 // Dependencies must be checked when the system dictionary changes. 803 // If logging is enabled all violated dependences will be recorded in 804 // the log. In debug mode check dependencies even if the system 805 // dictionary hasn't changed to verify that no invalid dependencies 806 // were inserted. Any violated dependences in this case are dumped to 807 // the tty. 808 809 bool counter_changed = system_dictionary_modification_counter_changed(); 810 bool test_deps = counter_changed; 811 DEBUG_ONLY(test_deps = true); 812 if (!test_deps) return; 813 814 bool print_failures = false; 815 DEBUG_ONLY(print_failures = !counter_changed); 816 817 bool keep_going = (print_failures || xtty != NULL); 818 819 int violated = 0; 820 821 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) { 822 klassOop witness = deps.check_dependency(); 823 if (witness != NULL) { 824 ++violated; 825 if (print_failures) deps.print_dependency(witness, /*verbose=*/ true); 826 // If there's no log and we're not sanity-checking, we're done. 827 if (!keep_going) break; 828 } 829 } 830 831 if (violated != 0) { 832 assert(counter_changed, "failed dependencies, but counter didn't change"); 833 record_failure("concurrent class loading"); 834 } 835 } 836 837 // ------------------------------------------------------------------ 838 // ciEnv::register_method 839 void ciEnv::register_method(ciMethod* target, 840 int entry_bci, 841 CodeOffsets* offsets, 842 int orig_pc_offset, 843 CodeBuffer* code_buffer, 844 int frame_words, 845 OopMapSet* oop_map_set, 846 ExceptionHandlerTable* handler_table, 847 ImplicitExceptionTable* inc_table, 848 AbstractCompiler* compiler, 849 int comp_level, 850 bool has_debug_info, 851 bool has_unsafe_access) { 852 VM_ENTRY_MARK; 853 nmethod* nm = NULL; 854 { 855 // To prevent compile queue updates. 856 MutexLocker locker(MethodCompileQueue_lock, THREAD); 857 858 // Prevent SystemDictionary::add_to_hierarchy from running 859 // and invalidating our dependencies until we install this method. 860 MutexLocker ml(Compile_lock); 861 862 // Change in Jvmti state may invalidate compilation. 863 if (!failing() && 864 ( (!jvmti_can_hotswap_or_post_breakpoint() && 865 JvmtiExport::can_hotswap_or_post_breakpoint()) || 866 (!jvmti_can_examine_or_deopt_anywhere() && 867 JvmtiExport::can_examine_or_deopt_anywhere()) || 868 (!jvmti_can_access_local_variables() && 869 JvmtiExport::can_access_local_variables()) || 870 (!jvmti_can_post_exceptions() && 871 JvmtiExport::can_post_exceptions()) )) { 872 record_failure("Jvmti state change invalidated dependencies"); 873 } 874 875 // Change in DTrace flags may invalidate compilation. 876 if (!failing() && 877 ( (!dtrace_extended_probes() && ExtendedDTraceProbes) || 878 (!dtrace_method_probes() && DTraceMethodProbes) || 879 (!dtrace_alloc_probes() && DTraceAllocProbes) )) { 880 record_failure("DTrace flags change invalidated dependencies"); 881 } 882 883 if (!failing()) { 884 if (log() != NULL) { 885 // Log the dependencies which this compilation declares. 886 dependencies()->log_all_dependencies(); 887 } 888 889 // Encode the dependencies now, so we can check them right away. 890 dependencies()->encode_content_bytes(); 891 892 // Check for {class loads, evolution, breakpoints} during compilation 893 check_for_system_dictionary_modification(target); 894 } 895 896 methodHandle method(THREAD, target->get_methodOop()); 897 898 if (failing()) { 899 // While not a true deoptimization, it is a preemptive decompile. 900 methodDataOop mdo = method()->method_data(); 901 if (mdo != NULL) { 902 mdo->inc_decompile_count(); 903 } 904 905 // All buffers in the CodeBuffer are allocated in the CodeCache. 906 // If the code buffer is created on each compile attempt 907 // as in C2, then it must be freed. 908 code_buffer->free_blob(); 909 return; 910 } 911 912 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry"); 913 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry"); 914 915 nm = nmethod::new_nmethod(method, 916 compile_id(), 917 entry_bci, 918 offsets, 919 orig_pc_offset, 920 debug_info(), dependencies(), code_buffer, 921 frame_words, oop_map_set, 922 handler_table, inc_table, 923 compiler, comp_level); 924 925 // Free codeBlobs 926 code_buffer->free_blob(); 927 928 // stress test 6243940 by immediately making the method 929 // non-entrant behind the system's back. This has serious 930 // side effects on the code cache and is not meant for 931 // general stress testing 932 if (nm != NULL && StressNonEntrant) { 933 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 934 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(), 935 SharedRuntime::get_handle_wrong_method_stub()); 936 } 937 938 if (nm == NULL) { 939 // The CodeCache is full. Print out warning and disable compilation. 940 record_failure("code cache is full"); 941 { 942 MutexUnlocker ml(Compile_lock); 943 MutexUnlocker locker(MethodCompileQueue_lock); 944 CompileBroker::handle_full_code_cache(); 945 } 946 } else { 947 NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); ) 948 nm->set_has_unsafe_access(has_unsafe_access); 949 950 // Record successful registration. 951 // (Put nm into the task handle *before* publishing to the Java heap.) 952 if (task() != NULL) task()->set_code(nm); 953 954 if (entry_bci == InvocationEntryBci) { 955 #ifdef TIERED 956 // If there is an old version we're done with it 957 nmethod* old = method->code(); 958 if (TraceMethodReplacement && old != NULL) { 959 ResourceMark rm; 960 char *method_name = method->name_and_sig_as_C_string(); 961 tty->print_cr("Replacing method %s", method_name); 962 } 963 if (old != NULL ) { 964 old->make_not_entrant(); 965 } 966 #endif // TIERED 967 if (TraceNMethodInstalls ) { 968 ResourceMark rm; 969 char *method_name = method->name_and_sig_as_C_string(); 970 ttyLocker ttyl; 971 tty->print_cr("Installing method (%d) %s ", 972 comp_level, 973 method_name); 974 } 975 // Allow the code to be executed 976 method->set_code(method, nm); 977 } else { 978 if (TraceNMethodInstalls ) { 979 ResourceMark rm; 980 char *method_name = method->name_and_sig_as_C_string(); 981 ttyLocker ttyl; 982 tty->print_cr("Installing osr method (%d) %s @ %d", 983 comp_level, 984 method_name, 985 entry_bci); 986 } 987 instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm); 988 989 } 990 } 991 } 992 // JVMTI -- compiled method notification (must be done outside lock) 993 if (nm != NULL) { 994 nm->post_compiled_method_load_event(); 995 } 996 997 } 998 999 1000 // ------------------------------------------------------------------ 1001 // ciEnv::find_system_klass 1002 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) { 1003 VM_ENTRY_MARK; 1004 return get_klass_by_name_impl(NULL, klass_name, false); 1005 } 1006 1007 // ------------------------------------------------------------------ 1008 // ciEnv::comp_level 1009 int ciEnv::comp_level() { 1010 if (task() == NULL) return CompLevel_full_optimization; 1011 return task()->comp_level(); 1012 } 1013 1014 // ------------------------------------------------------------------ 1015 // ciEnv::compile_id 1016 uint ciEnv::compile_id() { 1017 if (task() == NULL) return 0; 1018 return task()->compile_id(); 1019 } 1020 1021 // ------------------------------------------------------------------ 1022 // ciEnv::notice_inlined_method() 1023 void ciEnv::notice_inlined_method(ciMethod* method) { 1024 _num_inlined_bytecodes += method->code_size(); 1025 } 1026 1027 // ------------------------------------------------------------------ 1028 // ciEnv::num_inlined_bytecodes() 1029 int ciEnv::num_inlined_bytecodes() const { 1030 return _num_inlined_bytecodes; 1031 } 1032 1033 // ------------------------------------------------------------------ 1034 // ciEnv::record_failure() 1035 void ciEnv::record_failure(const char* reason) { 1036 if (log() != NULL) { 1037 log()->elem("failure reason='%s'", reason); 1038 } 1039 if (_failure_reason == NULL) { 1040 // Record the first failure reason. 1041 _failure_reason = reason; 1042 } 1043 } 1044 1045 // ------------------------------------------------------------------ 1046 // ciEnv::record_method_not_compilable() 1047 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) { 1048 int new_compilable = 1049 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ; 1050 1051 // Only note transitions to a worse state 1052 if (new_compilable > _compilable) { 1053 if (log() != NULL) { 1054 if (all_tiers) { 1055 log()->elem("method_not_compilable"); 1056 } else { 1057 log()->elem("method_not_compilable_at_tier"); 1058 } 1059 } 1060 _compilable = new_compilable; 1061 1062 // Reset failure reason; this one is more important. 1063 _failure_reason = NULL; 1064 record_failure(reason); 1065 } 1066 } 1067 1068 // ------------------------------------------------------------------ 1069 // ciEnv::record_out_of_memory_failure() 1070 void ciEnv::record_out_of_memory_failure() { 1071 // If memory is low, we stop compiling methods. 1072 record_method_not_compilable("out of memory"); 1073 } --- EOF ---