ciEnv.cpp revision 1339:09ac706c2623
1/* 2 * Copyright 1999-2010 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 33ciObject* ciEnv::_null_object_instance; 34ciMethodKlass* ciEnv::_method_klass_instance; 35ciSymbolKlass* ciEnv::_symbol_klass_instance; 36ciKlassKlass* ciEnv::_klass_klass_instance; 37ciInstanceKlassKlass* ciEnv::_instance_klass_klass_instance; 38ciTypeArrayKlassKlass* ciEnv::_type_array_klass_klass_instance; 39ciObjArrayKlassKlass* ciEnv::_obj_array_klass_klass_instance; 40 41#define WK_KLASS_DEFN(name, ignore_s, ignore_o) ciInstanceKlass* ciEnv::_##name = NULL; 42WK_KLASSES_DO(WK_KLASS_DEFN) 43#undef WK_KLASS_DEFN 44 45ciSymbol* ciEnv::_unloaded_cisymbol = NULL; 46ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL; 47ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL; 48 49jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL; 50jobject ciEnv::_ArrayStoreException_handle = NULL; 51jobject ciEnv::_ClassCastException_handle = NULL; 52 53#ifndef PRODUCT 54static bool firstEnv = true; 55#endif /* PRODUCT */ 56 57// ------------------------------------------------------------------ 58// ciEnv::ciEnv 59ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) { 60 VM_ENTRY_MARK; 61 62 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc. 63 thread->set_env(this); 64 assert(ciEnv::current() == this, "sanity"); 65 66 _oop_recorder = NULL; 67 _debug_info = NULL; 68 _dependencies = NULL; 69 _failure_reason = NULL; 70 _compilable = MethodCompilable; 71 _break_at_compile = false; 72 _compiler_data = NULL; 73#ifndef PRODUCT 74 assert(!firstEnv, "not initialized properly"); 75#endif /* !PRODUCT */ 76 77 _system_dictionary_modification_counter = system_dictionary_modification_counter; 78 _num_inlined_bytecodes = 0; 79 assert(task == NULL || thread->task() == task, "sanity"); 80 _task = task; 81 _log = NULL; 82 83 // Temporary buffer for creating symbols and such. 84 _name_buffer = NULL; 85 _name_buffer_len = 0; 86 87 _arena = &_ciEnv_arena; 88 _factory = new (_arena) ciObjectFactory(_arena, 128); 89 90 // Preload commonly referenced system ciObjects. 91 92 // During VM initialization, these instances have not yet been created. 93 // Assertions ensure that these instances are not accessed before 94 // their initialization. 95 96 assert(Universe::is_fully_initialized(), "should be complete"); 97 98 oop o = Universe::null_ptr_exception_instance(); 99 assert(o != NULL, "should have been initialized"); 100 _NullPointerException_instance = get_object(o)->as_instance(); 101 o = Universe::arithmetic_exception_instance(); 102 assert(o != NULL, "should have been initialized"); 103 _ArithmeticException_instance = get_object(o)->as_instance(); 104 105 _ArrayIndexOutOfBoundsException_instance = NULL; 106 _ArrayStoreException_instance = NULL; 107 _ClassCastException_instance = NULL; 108 _the_null_string = NULL; 109 _the_min_jint_string = NULL; 110} 111 112ciEnv::ciEnv(Arena* arena) { 113 ASSERT_IN_VM; 114 115 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc. 116 CompilerThread* current_thread = CompilerThread::current(); 117 assert(current_thread->env() == NULL, "must be"); 118 current_thread->set_env(this); 119 assert(ciEnv::current() == this, "sanity"); 120 121 _oop_recorder = NULL; 122 _debug_info = NULL; 123 _dependencies = NULL; 124 _failure_reason = NULL; 125 _compilable = MethodCompilable_never; 126 _break_at_compile = false; 127 _compiler_data = NULL; 128#ifndef PRODUCT 129 assert(firstEnv, "must be first"); 130 firstEnv = false; 131#endif /* !PRODUCT */ 132 133 _system_dictionary_modification_counter = 0; 134 _num_inlined_bytecodes = 0; 135 _task = NULL; 136 _log = NULL; 137 138 // Temporary buffer for creating symbols and such. 139 _name_buffer = NULL; 140 _name_buffer_len = 0; 141 142 _arena = arena; 143 _factory = new (_arena) ciObjectFactory(_arena, 128); 144 145 // Preload commonly referenced system ciObjects. 146 147 // During VM initialization, these instances have not yet been created. 148 // Assertions ensure that these instances are not accessed before 149 // their initialization. 150 151 assert(Universe::is_fully_initialized(), "must be"); 152 153 oop o = Universe::null_ptr_exception_instance(); 154 assert(o != NULL, "should have been initialized"); 155 _NullPointerException_instance = get_object(o)->as_instance(); 156 o = Universe::arithmetic_exception_instance(); 157 assert(o != NULL, "should have been initialized"); 158 _ArithmeticException_instance = get_object(o)->as_instance(); 159 160 _ArrayIndexOutOfBoundsException_instance = NULL; 161 _ArrayStoreException_instance = NULL; 162 _ClassCastException_instance = NULL; 163 _the_null_string = NULL; 164 _the_min_jint_string = NULL; 165} 166 167ciEnv::~ciEnv() { 168 CompilerThread* current_thread = CompilerThread::current(); 169 current_thread->set_env(NULL); 170} 171 172// ------------------------------------------------------------------ 173// Cache Jvmti state 174void ciEnv::cache_jvmti_state() { 175 VM_ENTRY_MARK; 176 // Get Jvmti capabilities under lock to get consistant values. 177 MutexLocker mu(JvmtiThreadState_lock); 178 _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint(); 179 _jvmti_can_examine_or_deopt_anywhere = JvmtiExport::can_examine_or_deopt_anywhere(); 180 _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables(); 181 _jvmti_can_post_on_exceptions = JvmtiExport::can_post_on_exceptions(); 182} 183 184// ------------------------------------------------------------------ 185// Cache DTrace flags 186void ciEnv::cache_dtrace_flags() { 187 // Need lock? 188 _dtrace_extended_probes = ExtendedDTraceProbes; 189 if (_dtrace_extended_probes) { 190 _dtrace_monitor_probes = true; 191 _dtrace_method_probes = true; 192 _dtrace_alloc_probes = true; 193 } else { 194 _dtrace_monitor_probes = DTraceMonitorProbes; 195 _dtrace_method_probes = DTraceMethodProbes; 196 _dtrace_alloc_probes = DTraceAllocProbes; 197 } 198} 199 200// ------------------------------------------------------------------ 201// helper for lazy exception creation 202ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) { 203 VM_ENTRY_MARK; 204 if (handle == NULL) { 205 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance. 206 klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD); 207 jobject objh = NULL; 208 if (!HAS_PENDING_EXCEPTION && k != NULL) { 209 oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD); 210 if (!HAS_PENDING_EXCEPTION) 211 objh = JNIHandles::make_global(obj); 212 } 213 if (HAS_PENDING_EXCEPTION) { 214 CLEAR_PENDING_EXCEPTION; 215 } else { 216 handle = objh; 217 } 218 } 219 oop obj = JNIHandles::resolve(handle); 220 return obj == NULL? NULL: get_object(obj)->as_instance(); 221} 222 223// ------------------------------------------------------------------ 224// ciEnv::ArrayIndexOutOfBoundsException_instance, etc. 225ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() { 226 if (_ArrayIndexOutOfBoundsException_instance == NULL) { 227 _ArrayIndexOutOfBoundsException_instance 228 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle, 229 vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException()); 230 } 231 return _ArrayIndexOutOfBoundsException_instance; 232} 233ciInstance* ciEnv::ArrayStoreException_instance() { 234 if (_ArrayStoreException_instance == NULL) { 235 _ArrayStoreException_instance 236 = get_or_create_exception(_ArrayStoreException_handle, 237 vmSymbolHandles::java_lang_ArrayStoreException()); 238 } 239 return _ArrayStoreException_instance; 240} 241ciInstance* ciEnv::ClassCastException_instance() { 242 if (_ClassCastException_instance == NULL) { 243 _ClassCastException_instance 244 = get_or_create_exception(_ClassCastException_handle, 245 vmSymbolHandles::java_lang_ClassCastException()); 246 } 247 return _ClassCastException_instance; 248} 249 250ciInstance* ciEnv::the_null_string() { 251 if (_the_null_string == NULL) { 252 VM_ENTRY_MARK; 253 _the_null_string = get_object(Universe::the_null_string())->as_instance(); 254 } 255 return _the_null_string; 256} 257 258ciInstance* ciEnv::the_min_jint_string() { 259 if (_the_min_jint_string == NULL) { 260 VM_ENTRY_MARK; 261 _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance(); 262 } 263 return _the_min_jint_string; 264} 265 266// ------------------------------------------------------------------ 267// ciEnv::get_method_from_handle 268ciMethod* ciEnv::get_method_from_handle(jobject method) { 269 VM_ENTRY_MARK; 270 return get_object(JNIHandles::resolve(method))->as_method(); 271} 272 273// ------------------------------------------------------------------ 274// ciEnv::make_array 275ciArray* ciEnv::make_system_array(GrowableArray<ciObject*>* objects) { 276 VM_ENTRY_MARK; 277 int length = objects->length(); 278 objArrayOop a = oopFactory::new_system_objArray(length, THREAD); 279 if (HAS_PENDING_EXCEPTION) { 280 CLEAR_PENDING_EXCEPTION; 281 record_out_of_memory_failure(); 282 return NULL; 283 } 284 for (int i = 0; i < length; i++) { 285 a->obj_at_put(i, objects->at(i)->get_oop()); 286 } 287 assert(a->is_perm(), ""); 288 return get_object(a)->as_array(); 289} 290 291 292// ------------------------------------------------------------------ 293// ciEnv::array_element_offset_in_bytes 294int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) { 295 VM_ENTRY_MARK; 296 objArrayOop a = (objArrayOop)a_h->get_oop(); 297 assert(a->is_objArray(), ""); 298 int length = a->length(); 299 oop o = o_h->get_oop(); 300 for (int i = 0; i < length; i++) { 301 if (a->obj_at(i) == o) return i; 302 } 303 return -1; 304} 305 306 307// ------------------------------------------------------------------ 308// ciEnv::check_klass_accessiblity 309// 310// Note: the logic of this method should mirror the logic of 311// constantPoolOopDesc::verify_constant_pool_resolve. 312bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass, 313 klassOop resolved_klass) { 314 if (accessing_klass == NULL || !accessing_klass->is_loaded()) { 315 return true; 316 } 317 if (accessing_klass->is_obj_array()) { 318 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass(); 319 } 320 if (!accessing_klass->is_instance_klass()) { 321 return true; 322 } 323 324 if (resolved_klass->klass_part()->oop_is_objArray()) { 325 // Find the element klass, if this is an array. 326 resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass(); 327 } 328 if (resolved_klass->klass_part()->oop_is_instance()) { 329 return Reflection::verify_class_access(accessing_klass->get_klassOop(), 330 resolved_klass, 331 true); 332 } 333 return true; 334} 335 336// ------------------------------------------------------------------ 337// ciEnv::get_klass_by_name_impl 338ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass, 339 ciSymbol* name, 340 bool require_local) { 341 ASSERT_IN_VM; 342 EXCEPTION_CONTEXT; 343 344 // Now we need to check the SystemDictionary 345 symbolHandle sym(THREAD, name->get_symbolOop()); 346 if (sym->byte_at(0) == 'L' && 347 sym->byte_at(sym->utf8_length()-1) == ';') { 348 // This is a name from a signature. Strip off the trimmings. 349 sym = oopFactory::new_symbol_handle(sym->as_utf8()+1, 350 sym->utf8_length()-2, 351 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass)); 352 name = get_object(sym())->as_symbol(); 353 } 354 355 // Check for prior unloaded klass. The SystemDictionary's answers 356 // can vary over time but the compiler needs consistency. 357 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name); 358 if (unloaded_klass != NULL) { 359 if (require_local) return NULL; 360 return unloaded_klass; 361 } 362 363 Handle loader(THREAD, (oop)NULL); 364 Handle domain(THREAD, (oop)NULL); 365 if (accessing_klass != NULL) { 366 loader = Handle(THREAD, accessing_klass->loader()); 367 domain = Handle(THREAD, accessing_klass->protection_domain()); 368 } 369 370 // setup up the proper type to return on OOM 371 ciKlass* fail_type; 372 if (sym->byte_at(0) == '[') { 373 fail_type = _unloaded_ciobjarrayklass; 374 } else { 375 fail_type = _unloaded_ciinstance_klass; 376 } 377 klassOop found_klass; 378 if (!require_local) { 379 found_klass = 380 SystemDictionary::find_constrained_instance_or_array_klass(sym, loader, 381 KILL_COMPILE_ON_FATAL_(fail_type)); 382 } else { 383 found_klass = 384 SystemDictionary::find_instance_or_array_klass(sym, loader, domain, 385 KILL_COMPILE_ON_FATAL_(fail_type)); 386 } 387 388 // If we fail to find an array klass, look again for its element type. 389 // The element type may be available either locally or via constraints. 390 // In either case, if we can find the element type in the system dictionary, 391 // we must build an array type around it. The CI requires array klasses 392 // to be loaded if their element klasses are loaded, except when memory 393 // is exhausted. 394 if (sym->byte_at(0) == '[' && 395 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) { 396 // We have an unloaded array. 397 // Build it on the fly if the element class exists. 398 symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1, 399 sym->utf8_length()-1, 400 KILL_COMPILE_ON_FATAL_(fail_type)); 401 // Get element ciKlass recursively. 402 ciKlass* elem_klass = 403 get_klass_by_name_impl(accessing_klass, 404 get_object(elem_sym)->as_symbol(), 405 require_local); 406 if (elem_klass != NULL && elem_klass->is_loaded()) { 407 // Now make an array for it 408 return ciObjArrayKlass::make_impl(elem_klass); 409 } 410 } 411 412 if (found_klass != NULL) { 413 // Found it. Build a CI handle. 414 return get_object(found_klass)->as_klass(); 415 } 416 417 if (require_local) return NULL; 418 // Not yet loaded into the VM, or not governed by loader constraints. 419 // Make a CI representative for it. 420 return get_unloaded_klass(accessing_klass, name); 421} 422 423// ------------------------------------------------------------------ 424// ciEnv::get_klass_by_name 425ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass, 426 ciSymbol* klass_name, 427 bool require_local) { 428 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass, 429 klass_name, 430 require_local);) 431} 432 433// ------------------------------------------------------------------ 434// ciEnv::get_klass_by_index_impl 435// 436// Implementation of get_klass_by_index. 437ciKlass* ciEnv::get_klass_by_index_impl(constantPoolHandle cpool, 438 int index, 439 bool& is_accessible, 440 ciInstanceKlass* accessor) { 441 EXCEPTION_CONTEXT; 442 KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index)); 443 symbolHandle klass_name; 444 if (klass.is_null()) { 445 // The klass has not been inserted into the constant pool. 446 // Try to look it up by name. 447 { 448 // We have to lock the cpool to keep the oop from being resolved 449 // while we are accessing it. 450 ObjectLocker ol(cpool, THREAD); 451 452 constantTag tag = cpool->tag_at(index); 453 if (tag.is_klass()) { 454 // The klass has been inserted into the constant pool 455 // very recently. 456 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index)); 457 } else if (tag.is_symbol()) { 458 klass_name = symbolHandle(THREAD, cpool->symbol_at(index)); 459 } else { 460 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag"); 461 klass_name = symbolHandle(THREAD, cpool->unresolved_klass_at(index)); 462 } 463 } 464 } 465 466 if (klass.is_null()) { 467 // Not found in constant pool. Use the name to do the lookup. 468 ciKlass* k = get_klass_by_name_impl(accessor, 469 get_object(klass_name())->as_symbol(), 470 false); 471 // Calculate accessibility the hard way. 472 if (!k->is_loaded()) { 473 is_accessible = false; 474 } else if (k->loader() != accessor->loader() && 475 get_klass_by_name_impl(accessor, k->name(), true) == NULL) { 476 // Loaded only remotely. Not linked yet. 477 is_accessible = false; 478 } else { 479 // Linked locally, and we must also check public/private, etc. 480 is_accessible = check_klass_accessibility(accessor, k->get_klassOop()); 481 } 482 return k; 483 } 484 485 // Check for prior unloaded klass. The SystemDictionary's answers 486 // can vary over time but the compiler needs consistency. 487 ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol(); 488 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name); 489 if (unloaded_klass != NULL) { 490 is_accessible = false; 491 return unloaded_klass; 492 } 493 494 // It is known to be accessible, since it was found in the constant pool. 495 is_accessible = true; 496 return get_object(klass())->as_klass(); 497} 498 499// ------------------------------------------------------------------ 500// ciEnv::get_klass_by_index 501// 502// Get a klass from the constant pool. 503ciKlass* ciEnv::get_klass_by_index(constantPoolHandle cpool, 504 int index, 505 bool& is_accessible, 506 ciInstanceKlass* accessor) { 507 GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);) 508} 509 510// ------------------------------------------------------------------ 511// ciEnv::get_constant_by_index_impl 512// 513// Implementation of get_constant_by_index(). 514ciConstant ciEnv::get_constant_by_index_impl(constantPoolHandle cpool, 515 int index, 516 ciInstanceKlass* accessor) { 517 EXCEPTION_CONTEXT; 518 constantTag tag = cpool->tag_at(index); 519 if (tag.is_int()) { 520 return ciConstant(T_INT, (jint)cpool->int_at(index)); 521 } else if (tag.is_long()) { 522 return ciConstant((jlong)cpool->long_at(index)); 523 } else if (tag.is_float()) { 524 return ciConstant((jfloat)cpool->float_at(index)); 525 } else if (tag.is_double()) { 526 return ciConstant((jdouble)cpool->double_at(index)); 527 } else if (tag.is_string() || tag.is_unresolved_string()) { 528 oop string = NULL; 529 if (cpool->is_pseudo_string_at(index)) { 530 string = cpool->pseudo_string_at(index); 531 } else { 532 string = cpool->string_at(index, THREAD); 533 if (HAS_PENDING_EXCEPTION) { 534 CLEAR_PENDING_EXCEPTION; 535 record_out_of_memory_failure(); 536 return ciConstant(); 537 } 538 } 539 ciObject* constant = get_object(string); 540 assert (constant->is_instance(), "must be an instance, or not? "); 541 return ciConstant(T_OBJECT, constant); 542 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 543 // 4881222: allow ldc to take a class type 544 bool ignore; 545 ciKlass* klass = get_klass_by_index_impl(cpool, index, ignore, accessor); 546 if (HAS_PENDING_EXCEPTION) { 547 CLEAR_PENDING_EXCEPTION; 548 record_out_of_memory_failure(); 549 return ciConstant(); 550 } 551 assert (klass->is_instance_klass() || klass->is_array_klass(), 552 "must be an instance or array klass "); 553 return ciConstant(T_OBJECT, klass); 554 } else if (tag.is_object()) { 555 oop obj = cpool->object_at(index); 556 assert(obj->is_instance(), "must be an instance"); 557 ciObject* ciobj = get_object(obj); 558 return ciConstant(T_OBJECT, ciobj); 559 } else { 560 ShouldNotReachHere(); 561 return ciConstant(); 562 } 563} 564 565// ------------------------------------------------------------------ 566// ciEnv::is_unresolved_string_impl 567// 568// Implementation of is_unresolved_string(). 569bool ciEnv::is_unresolved_string_impl(instanceKlass* accessor, int index) const { 570 EXCEPTION_CONTEXT; 571 assert(accessor->is_linked(), "must be linked before accessing constant pool"); 572 constantPoolOop cpool = accessor->constants(); 573 constantTag tag = cpool->tag_at(index); 574 return tag.is_unresolved_string(); 575} 576 577// ------------------------------------------------------------------ 578// ciEnv::is_unresolved_klass_impl 579// 580// Implementation of is_unresolved_klass(). 581bool ciEnv::is_unresolved_klass_impl(instanceKlass* accessor, int index) const { 582 EXCEPTION_CONTEXT; 583 assert(accessor->is_linked(), "must be linked before accessing constant pool"); 584 constantPoolOop cpool = accessor->constants(); 585 constantTag tag = cpool->tag_at(index); 586 return tag.is_unresolved_klass(); 587} 588 589// ------------------------------------------------------------------ 590// ciEnv::get_constant_by_index 591// 592// Pull a constant out of the constant pool. How appropriate. 593// 594// Implementation note: this query is currently in no way cached. 595ciConstant ciEnv::get_constant_by_index(constantPoolHandle cpool, 596 int index, 597 ciInstanceKlass* accessor) { 598 GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, index, accessor);) 599} 600 601// ------------------------------------------------------------------ 602// ciEnv::is_unresolved_string 603// 604// Check constant pool 605// 606// Implementation note: this query is currently in no way cached. 607bool ciEnv::is_unresolved_string(ciInstanceKlass* accessor, 608 int index) const { 609 GUARDED_VM_ENTRY(return is_unresolved_string_impl(accessor->get_instanceKlass(), index); ) 610} 611 612// ------------------------------------------------------------------ 613// ciEnv::is_unresolved_klass 614// 615// Check constant pool 616// 617// Implementation note: this query is currently in no way cached. 618bool ciEnv::is_unresolved_klass(ciInstanceKlass* accessor, 619 int index) const { 620 GUARDED_VM_ENTRY(return is_unresolved_klass_impl(accessor->get_instanceKlass(), index); ) 621} 622 623// ------------------------------------------------------------------ 624// ciEnv::get_field_by_index_impl 625// 626// Implementation of get_field_by_index. 627// 628// Implementation note: the results of field lookups are cached 629// in the accessor klass. 630ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor, 631 int index) { 632 ciConstantPoolCache* cache = accessor->field_cache(); 633 if (cache == NULL) { 634 ciField* field = new (arena()) ciField(accessor, index); 635 return field; 636 } else { 637 ciField* field = (ciField*)cache->get(index); 638 if (field == NULL) { 639 field = new (arena()) ciField(accessor, index); 640 cache->insert(index, field); 641 } 642 return field; 643 } 644} 645 646// ------------------------------------------------------------------ 647// ciEnv::get_field_by_index 648// 649// Get a field by index from a klass's constant pool. 650ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor, 651 int index) { 652 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);) 653} 654 655// ------------------------------------------------------------------ 656// ciEnv::lookup_method 657// 658// Perform an appropriate method lookup based on accessor, holder, 659// name, signature, and bytecode. 660methodOop ciEnv::lookup_method(instanceKlass* accessor, 661 instanceKlass* holder, 662 symbolOop name, 663 symbolOop sig, 664 Bytecodes::Code bc) { 665 EXCEPTION_CONTEXT; 666 KlassHandle h_accessor(THREAD, accessor); 667 KlassHandle h_holder(THREAD, holder); 668 symbolHandle h_name(THREAD, name); 669 symbolHandle h_sig(THREAD, sig); 670 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL)); 671 methodHandle dest_method; 672 switch (bc) { 673 case Bytecodes::_invokestatic: 674 dest_method = 675 LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor); 676 break; 677 case Bytecodes::_invokespecial: 678 dest_method = 679 LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor); 680 break; 681 case Bytecodes::_invokeinterface: 682 dest_method = 683 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig, 684 h_accessor, true); 685 break; 686 case Bytecodes::_invokevirtual: 687 dest_method = 688 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig, 689 h_accessor, true); 690 break; 691 default: ShouldNotReachHere(); 692 } 693 694 return dest_method(); 695} 696 697 698// ------------------------------------------------------------------ 699// ciEnv::get_method_by_index_impl 700ciMethod* ciEnv::get_method_by_index_impl(constantPoolHandle cpool, 701 int index, Bytecodes::Code bc, 702 ciInstanceKlass* accessor) { 703 int holder_index = cpool->klass_ref_index_at(index); 704 bool holder_is_accessible; 705 ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor); 706 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder); 707 708 // Get the method's name and signature. 709 symbolOop name_sym = cpool->name_ref_at(index); 710 symbolOop sig_sym = cpool->signature_ref_at(index); 711 712 if (holder_is_accessible) { // Our declared holder is loaded. 713 instanceKlass* lookup = declared_holder->get_instanceKlass(); 714 methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc); 715 if (m != NULL) { 716 // We found the method. 717 return get_object(m)->as_method(); 718 } 719 } 720 721 // Either the declared holder was not loaded, or the method could 722 // not be found. Create a dummy ciMethod to represent the failed 723 // lookup. 724 725 return get_unloaded_method(declared_holder, 726 get_object(name_sym)->as_symbol(), 727 get_object(sig_sym)->as_symbol()); 728} 729 730 731// ------------------------------------------------------------------ 732// ciEnv::get_fake_invokedynamic_method_impl 733ciMethod* ciEnv::get_fake_invokedynamic_method_impl(constantPoolHandle cpool, 734 int index, Bytecodes::Code bc) { 735 assert(bc == Bytecodes::_invokedynamic, "must be invokedynamic"); 736 737 // Get the CallSite from the constant pool cache. 738 ConstantPoolCacheEntry* cpc_entry = cpool->cache()->secondary_entry_at(index); 739 assert(cpc_entry != NULL && cpc_entry->is_secondary_entry(), "sanity"); 740 Handle call_site = cpc_entry->f1(); 741 742 // Call site might not be linked yet. 743 if (call_site.is_null()) { 744 ciInstanceKlass* mh_klass = get_object(SystemDictionary::MethodHandle_klass())->as_instance_klass(); 745 ciSymbol* sig_sym = get_object(cpool->signature_ref_at(index))->as_symbol(); 746 return get_unloaded_method(mh_klass, ciSymbol::invoke_name(), sig_sym); 747 } 748 749 // Get the methodOop from the CallSite. 750 methodOop method_oop = (methodOop) java_dyn_CallSite::vmmethod(call_site()); 751 assert(method_oop != NULL, "sanity"); 752 assert(method_oop->is_method_handle_invoke(), "consistent"); 753 754 return get_object(method_oop)->as_method(); 755} 756 757 758// ------------------------------------------------------------------ 759// ciEnv::get_instance_klass_for_declared_method_holder 760ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) { 761 // For the case of <array>.clone(), the method holder can be a ciArrayKlass 762 // instead of a ciInstanceKlass. For that case simply pretend that the 763 // declared holder is Object.clone since that's where the call will bottom out. 764 // A more correct fix would trickle out through many interfaces in CI, 765 // requiring ciInstanceKlass* to become ciKlass* and many more places would 766 // require checks to make sure the expected type was found. Given that this 767 // only occurs for clone() the more extensive fix seems like overkill so 768 // instead we simply smear the array type into Object. 769 if (method_holder->is_instance_klass()) { 770 return method_holder->as_instance_klass(); 771 } else if (method_holder->is_array_klass()) { 772 return current()->Object_klass(); 773 } else { 774 ShouldNotReachHere(); 775 } 776 return NULL; 777} 778 779 780// ------------------------------------------------------------------ 781// ciEnv::get_method_by_index 782ciMethod* ciEnv::get_method_by_index(constantPoolHandle cpool, 783 int index, Bytecodes::Code bc, 784 ciInstanceKlass* accessor) { 785 if (bc == Bytecodes::_invokedynamic) { 786 GUARDED_VM_ENTRY(return get_fake_invokedynamic_method_impl(cpool, index, bc);) 787 } else { 788 GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);) 789 } 790} 791 792 793// ------------------------------------------------------------------ 794// ciEnv::name_buffer 795char *ciEnv::name_buffer(int req_len) { 796 if (_name_buffer_len < req_len) { 797 if (_name_buffer == NULL) { 798 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len); 799 _name_buffer_len = req_len; 800 } else { 801 _name_buffer = 802 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len); 803 _name_buffer_len = req_len; 804 } 805 } 806 return _name_buffer; 807} 808 809// ------------------------------------------------------------------ 810// ciEnv::is_in_vm 811bool ciEnv::is_in_vm() { 812 return JavaThread::current()->thread_state() == _thread_in_vm; 813} 814 815bool ciEnv::system_dictionary_modification_counter_changed() { 816 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications(); 817} 818 819// ------------------------------------------------------------------ 820// ciEnv::check_for_system_dictionary_modification 821// Check for changes to the system dictionary during compilation 822// class loads, evolution, breakpoints 823void ciEnv::check_for_system_dictionary_modification(ciMethod* target) { 824 if (failing()) return; // no need for further checks 825 826 // Dependencies must be checked when the system dictionary changes. 827 // If logging is enabled all violated dependences will be recorded in 828 // the log. In debug mode check dependencies even if the system 829 // dictionary hasn't changed to verify that no invalid dependencies 830 // were inserted. Any violated dependences in this case are dumped to 831 // the tty. 832 833 bool counter_changed = system_dictionary_modification_counter_changed(); 834 bool test_deps = counter_changed; 835 DEBUG_ONLY(test_deps = true); 836 if (!test_deps) return; 837 838 bool print_failures = false; 839 DEBUG_ONLY(print_failures = !counter_changed); 840 841 bool keep_going = (print_failures || xtty != NULL); 842 843 int violated = 0; 844 845 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) { 846 klassOop witness = deps.check_dependency(); 847 if (witness != NULL) { 848 ++violated; 849 if (print_failures) deps.print_dependency(witness, /*verbose=*/ true); 850 // If there's no log and we're not sanity-checking, we're done. 851 if (!keep_going) break; 852 } 853 } 854 855 if (violated != 0) { 856 assert(counter_changed, "failed dependencies, but counter didn't change"); 857 record_failure("concurrent class loading"); 858 } 859} 860 861// ------------------------------------------------------------------ 862// ciEnv::register_method 863void ciEnv::register_method(ciMethod* target, 864 int entry_bci, 865 CodeOffsets* offsets, 866 int orig_pc_offset, 867 CodeBuffer* code_buffer, 868 int frame_words, 869 OopMapSet* oop_map_set, 870 ExceptionHandlerTable* handler_table, 871 ImplicitExceptionTable* inc_table, 872 AbstractCompiler* compiler, 873 int comp_level, 874 bool has_debug_info, 875 bool has_unsafe_access) { 876 VM_ENTRY_MARK; 877 nmethod* nm = NULL; 878 { 879 // To prevent compile queue updates. 880 MutexLocker locker(MethodCompileQueue_lock, THREAD); 881 882 // Prevent SystemDictionary::add_to_hierarchy from running 883 // and invalidating our dependencies until we install this method. 884 MutexLocker ml(Compile_lock); 885 886 // Change in Jvmti state may invalidate compilation. 887 if (!failing() && 888 ( (!jvmti_can_hotswap_or_post_breakpoint() && 889 JvmtiExport::can_hotswap_or_post_breakpoint()) || 890 (!jvmti_can_examine_or_deopt_anywhere() && 891 JvmtiExport::can_examine_or_deopt_anywhere()) || 892 (!jvmti_can_access_local_variables() && 893 JvmtiExport::can_access_local_variables()) || 894 (!jvmti_can_post_on_exceptions() && 895 JvmtiExport::can_post_on_exceptions()) )) { 896 record_failure("Jvmti state change invalidated dependencies"); 897 } 898 899 // Change in DTrace flags may invalidate compilation. 900 if (!failing() && 901 ( (!dtrace_extended_probes() && ExtendedDTraceProbes) || 902 (!dtrace_method_probes() && DTraceMethodProbes) || 903 (!dtrace_alloc_probes() && DTraceAllocProbes) )) { 904 record_failure("DTrace flags change invalidated dependencies"); 905 } 906 907 if (!failing()) { 908 if (log() != NULL) { 909 // Log the dependencies which this compilation declares. 910 dependencies()->log_all_dependencies(); 911 } 912 913 // Encode the dependencies now, so we can check them right away. 914 dependencies()->encode_content_bytes(); 915 916 // Check for {class loads, evolution, breakpoints} during compilation 917 check_for_system_dictionary_modification(target); 918 } 919 920 methodHandle method(THREAD, target->get_methodOop()); 921 922 if (failing()) { 923 // While not a true deoptimization, it is a preemptive decompile. 924 methodDataOop mdo = method()->method_data(); 925 if (mdo != NULL) { 926 mdo->inc_decompile_count(); 927 } 928 929 // All buffers in the CodeBuffer are allocated in the CodeCache. 930 // If the code buffer is created on each compile attempt 931 // as in C2, then it must be freed. 932 code_buffer->free_blob(); 933 return; 934 } 935 936 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry"); 937 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry"); 938 939 nm = nmethod::new_nmethod(method, 940 compile_id(), 941 entry_bci, 942 offsets, 943 orig_pc_offset, 944 debug_info(), dependencies(), code_buffer, 945 frame_words, oop_map_set, 946 handler_table, inc_table, 947 compiler, comp_level); 948 949 // Free codeBlobs 950 code_buffer->free_blob(); 951 952 // stress test 6243940 by immediately making the method 953 // non-entrant behind the system's back. This has serious 954 // side effects on the code cache and is not meant for 955 // general stress testing 956 if (nm != NULL && StressNonEntrant) { 957 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 958 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(), 959 SharedRuntime::get_handle_wrong_method_stub()); 960 } 961 962 if (nm == NULL) { 963 // The CodeCache is full. Print out warning and disable compilation. 964 record_failure("code cache is full"); 965 { 966 MutexUnlocker ml(Compile_lock); 967 MutexUnlocker locker(MethodCompileQueue_lock); 968 CompileBroker::handle_full_code_cache(); 969 } 970 } else { 971 NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); ) 972 nm->set_has_unsafe_access(has_unsafe_access); 973 974 // Record successful registration. 975 // (Put nm into the task handle *before* publishing to the Java heap.) 976 if (task() != NULL) task()->set_code(nm); 977 978 if (entry_bci == InvocationEntryBci) { 979#ifdef TIERED 980 // If there is an old version we're done with it 981 nmethod* old = method->code(); 982 if (TraceMethodReplacement && old != NULL) { 983 ResourceMark rm; 984 char *method_name = method->name_and_sig_as_C_string(); 985 tty->print_cr("Replacing method %s", method_name); 986 } 987 if (old != NULL ) { 988 old->make_not_entrant(); 989 } 990#endif // TIERED 991 if (TraceNMethodInstalls ) { 992 ResourceMark rm; 993 char *method_name = method->name_and_sig_as_C_string(); 994 ttyLocker ttyl; 995 tty->print_cr("Installing method (%d) %s ", 996 comp_level, 997 method_name); 998 } 999 // Allow the code to be executed 1000 method->set_code(method, nm); 1001 } else { 1002 if (TraceNMethodInstalls ) { 1003 ResourceMark rm; 1004 char *method_name = method->name_and_sig_as_C_string(); 1005 ttyLocker ttyl; 1006 tty->print_cr("Installing osr method (%d) %s @ %d", 1007 comp_level, 1008 method_name, 1009 entry_bci); 1010 } 1011 instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm); 1012 1013 } 1014 } 1015 } 1016 // JVMTI -- compiled method notification (must be done outside lock) 1017 if (nm != NULL) { 1018 nm->post_compiled_method_load_event(); 1019 } 1020 1021} 1022 1023 1024// ------------------------------------------------------------------ 1025// ciEnv::find_system_klass 1026ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) { 1027 VM_ENTRY_MARK; 1028 return get_klass_by_name_impl(NULL, klass_name, false); 1029} 1030 1031// ------------------------------------------------------------------ 1032// ciEnv::comp_level 1033int ciEnv::comp_level() { 1034 if (task() == NULL) return CompLevel_full_optimization; 1035 return task()->comp_level(); 1036} 1037 1038// ------------------------------------------------------------------ 1039// ciEnv::compile_id 1040uint ciEnv::compile_id() { 1041 if (task() == NULL) return 0; 1042 return task()->compile_id(); 1043} 1044 1045// ------------------------------------------------------------------ 1046// ciEnv::notice_inlined_method() 1047void ciEnv::notice_inlined_method(ciMethod* method) { 1048 _num_inlined_bytecodes += method->code_size(); 1049} 1050 1051// ------------------------------------------------------------------ 1052// ciEnv::num_inlined_bytecodes() 1053int ciEnv::num_inlined_bytecodes() const { 1054 return _num_inlined_bytecodes; 1055} 1056 1057// ------------------------------------------------------------------ 1058// ciEnv::record_failure() 1059void ciEnv::record_failure(const char* reason) { 1060 if (log() != NULL) { 1061 log()->elem("failure reason='%s'", reason); 1062 } 1063 if (_failure_reason == NULL) { 1064 // Record the first failure reason. 1065 _failure_reason = reason; 1066 } 1067} 1068 1069// ------------------------------------------------------------------ 1070// ciEnv::record_method_not_compilable() 1071void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) { 1072 int new_compilable = 1073 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ; 1074 1075 // Only note transitions to a worse state 1076 if (new_compilable > _compilable) { 1077 if (log() != NULL) { 1078 if (all_tiers) { 1079 log()->elem("method_not_compilable"); 1080 } else { 1081 log()->elem("method_not_compilable_at_tier"); 1082 } 1083 } 1084 _compilable = new_compilable; 1085 1086 // Reset failure reason; this one is more important. 1087 _failure_reason = NULL; 1088 record_failure(reason); 1089 } 1090} 1091 1092// ------------------------------------------------------------------ 1093// ciEnv::record_out_of_memory_failure() 1094void ciEnv::record_out_of_memory_failure() { 1095 // If memory is low, we stop compiling methods. 1096 record_method_not_compilable("out of memory"); 1097} 1098