ciEnv.cpp revision 1397:b4776199210f
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_access_local_variables = JvmtiExport::can_access_local_variables(); 180 _jvmti_can_post_on_exceptions = JvmtiExport::can_post_on_exceptions(); 181} 182 183// ------------------------------------------------------------------ 184// Cache DTrace flags 185void ciEnv::cache_dtrace_flags() { 186 // Need lock? 187 _dtrace_extended_probes = ExtendedDTraceProbes; 188 if (_dtrace_extended_probes) { 189 _dtrace_monitor_probes = true; 190 _dtrace_method_probes = true; 191 _dtrace_alloc_probes = true; 192 } else { 193 _dtrace_monitor_probes = DTraceMonitorProbes; 194 _dtrace_method_probes = DTraceMethodProbes; 195 _dtrace_alloc_probes = DTraceAllocProbes; 196 } 197} 198 199// ------------------------------------------------------------------ 200// helper for lazy exception creation 201ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) { 202 VM_ENTRY_MARK; 203 if (handle == NULL) { 204 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance. 205 klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD); 206 jobject objh = NULL; 207 if (!HAS_PENDING_EXCEPTION && k != NULL) { 208 oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD); 209 if (!HAS_PENDING_EXCEPTION) 210 objh = JNIHandles::make_global(obj); 211 } 212 if (HAS_PENDING_EXCEPTION) { 213 CLEAR_PENDING_EXCEPTION; 214 } else { 215 handle = objh; 216 } 217 } 218 oop obj = JNIHandles::resolve(handle); 219 return obj == NULL? NULL: get_object(obj)->as_instance(); 220} 221 222// ------------------------------------------------------------------ 223// ciEnv::ArrayIndexOutOfBoundsException_instance, etc. 224ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() { 225 if (_ArrayIndexOutOfBoundsException_instance == NULL) { 226 _ArrayIndexOutOfBoundsException_instance 227 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle, 228 vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException()); 229 } 230 return _ArrayIndexOutOfBoundsException_instance; 231} 232ciInstance* ciEnv::ArrayStoreException_instance() { 233 if (_ArrayStoreException_instance == NULL) { 234 _ArrayStoreException_instance 235 = get_or_create_exception(_ArrayStoreException_handle, 236 vmSymbolHandles::java_lang_ArrayStoreException()); 237 } 238 return _ArrayStoreException_instance; 239} 240ciInstance* ciEnv::ClassCastException_instance() { 241 if (_ClassCastException_instance == NULL) { 242 _ClassCastException_instance 243 = get_or_create_exception(_ClassCastException_handle, 244 vmSymbolHandles::java_lang_ClassCastException()); 245 } 246 return _ClassCastException_instance; 247} 248 249ciInstance* ciEnv::the_null_string() { 250 if (_the_null_string == NULL) { 251 VM_ENTRY_MARK; 252 _the_null_string = get_object(Universe::the_null_string())->as_instance(); 253 } 254 return _the_null_string; 255} 256 257ciInstance* ciEnv::the_min_jint_string() { 258 if (_the_min_jint_string == NULL) { 259 VM_ENTRY_MARK; 260 _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance(); 261 } 262 return _the_min_jint_string; 263} 264 265// ------------------------------------------------------------------ 266// ciEnv::get_method_from_handle 267ciMethod* ciEnv::get_method_from_handle(jobject method) { 268 VM_ENTRY_MARK; 269 return get_object(JNIHandles::resolve(method))->as_method(); 270} 271 272// ------------------------------------------------------------------ 273// ciEnv::make_array 274ciArray* ciEnv::make_system_array(GrowableArray<ciObject*>* objects) { 275 VM_ENTRY_MARK; 276 int length = objects->length(); 277 objArrayOop a = oopFactory::new_system_objArray(length, THREAD); 278 if (HAS_PENDING_EXCEPTION) { 279 CLEAR_PENDING_EXCEPTION; 280 record_out_of_memory_failure(); 281 return NULL; 282 } 283 for (int i = 0; i < length; i++) { 284 a->obj_at_put(i, objects->at(i)->get_oop()); 285 } 286 assert(a->is_perm(), ""); 287 return get_object(a)->as_array(); 288} 289 290 291// ------------------------------------------------------------------ 292// ciEnv::array_element_offset_in_bytes 293int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) { 294 VM_ENTRY_MARK; 295 objArrayOop a = (objArrayOop)a_h->get_oop(); 296 assert(a->is_objArray(), ""); 297 int length = a->length(); 298 oop o = o_h->get_oop(); 299 for (int i = 0; i < length; i++) { 300 if (a->obj_at(i) == o) return i; 301 } 302 return -1; 303} 304 305 306// ------------------------------------------------------------------ 307// ciEnv::check_klass_accessiblity 308// 309// Note: the logic of this method should mirror the logic of 310// constantPoolOopDesc::verify_constant_pool_resolve. 311bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass, 312 klassOop resolved_klass) { 313 if (accessing_klass == NULL || !accessing_klass->is_loaded()) { 314 return true; 315 } 316 if (accessing_klass->is_obj_array()) { 317 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass(); 318 } 319 if (!accessing_klass->is_instance_klass()) { 320 return true; 321 } 322 323 if (resolved_klass->klass_part()->oop_is_objArray()) { 324 // Find the element klass, if this is an array. 325 resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass(); 326 } 327 if (resolved_klass->klass_part()->oop_is_instance()) { 328 return Reflection::verify_class_access(accessing_klass->get_klassOop(), 329 resolved_klass, 330 true); 331 } 332 return true; 333} 334 335// ------------------------------------------------------------------ 336// ciEnv::get_klass_by_name_impl 337ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass, 338 ciSymbol* name, 339 bool require_local) { 340 ASSERT_IN_VM; 341 EXCEPTION_CONTEXT; 342 343 // Now we need to check the SystemDictionary 344 symbolHandle sym(THREAD, name->get_symbolOop()); 345 if (sym->byte_at(0) == 'L' && 346 sym->byte_at(sym->utf8_length()-1) == ';') { 347 // This is a name from a signature. Strip off the trimmings. 348 sym = oopFactory::new_symbol_handle(sym->as_utf8()+1, 349 sym->utf8_length()-2, 350 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass)); 351 name = get_object(sym())->as_symbol(); 352 } 353 354 // Check for prior unloaded klass. The SystemDictionary's answers 355 // can vary over time but the compiler needs consistency. 356 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name); 357 if (unloaded_klass != NULL) { 358 if (require_local) return NULL; 359 return unloaded_klass; 360 } 361 362 Handle loader(THREAD, (oop)NULL); 363 Handle domain(THREAD, (oop)NULL); 364 if (accessing_klass != NULL) { 365 loader = Handle(THREAD, accessing_klass->loader()); 366 domain = Handle(THREAD, accessing_klass->protection_domain()); 367 } 368 369 // setup up the proper type to return on OOM 370 ciKlass* fail_type; 371 if (sym->byte_at(0) == '[') { 372 fail_type = _unloaded_ciobjarrayklass; 373 } else { 374 fail_type = _unloaded_ciinstance_klass; 375 } 376 klassOop found_klass; 377 if (!require_local) { 378 found_klass = 379 SystemDictionary::find_constrained_instance_or_array_klass(sym, loader, 380 KILL_COMPILE_ON_FATAL_(fail_type)); 381 } else { 382 found_klass = 383 SystemDictionary::find_instance_or_array_klass(sym, loader, domain, 384 KILL_COMPILE_ON_FATAL_(fail_type)); 385 } 386 387 // If we fail to find an array klass, look again for its element type. 388 // The element type may be available either locally or via constraints. 389 // In either case, if we can find the element type in the system dictionary, 390 // we must build an array type around it. The CI requires array klasses 391 // to be loaded if their element klasses are loaded, except when memory 392 // is exhausted. 393 if (sym->byte_at(0) == '[' && 394 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) { 395 // We have an unloaded array. 396 // Build it on the fly if the element class exists. 397 symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1, 398 sym->utf8_length()-1, 399 KILL_COMPILE_ON_FATAL_(fail_type)); 400 // Get element ciKlass recursively. 401 ciKlass* elem_klass = 402 get_klass_by_name_impl(accessing_klass, 403 get_object(elem_sym)->as_symbol(), 404 require_local); 405 if (elem_klass != NULL && elem_klass->is_loaded()) { 406 // Now make an array for it 407 return ciObjArrayKlass::make_impl(elem_klass); 408 } 409 } 410 411 if (found_klass != NULL) { 412 // Found it. Build a CI handle. 413 return get_object(found_klass)->as_klass(); 414 } 415 416 if (require_local) return NULL; 417 // Not yet loaded into the VM, or not governed by loader constraints. 418 // Make a CI representative for it. 419 return get_unloaded_klass(accessing_klass, name); 420} 421 422// ------------------------------------------------------------------ 423// ciEnv::get_klass_by_name 424ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass, 425 ciSymbol* klass_name, 426 bool require_local) { 427 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass, 428 klass_name, 429 require_local);) 430} 431 432// ------------------------------------------------------------------ 433// ciEnv::get_klass_by_index_impl 434// 435// Implementation of get_klass_by_index. 436ciKlass* ciEnv::get_klass_by_index_impl(constantPoolHandle cpool, 437 int index, 438 bool& is_accessible, 439 ciInstanceKlass* accessor) { 440 EXCEPTION_CONTEXT; 441 KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index)); 442 symbolHandle klass_name; 443 if (klass.is_null()) { 444 // The klass has not been inserted into the constant pool. 445 // Try to look it up by name. 446 { 447 // We have to lock the cpool to keep the oop from being resolved 448 // while we are accessing it. 449 ObjectLocker ol(cpool, THREAD); 450 451 constantTag tag = cpool->tag_at(index); 452 if (tag.is_klass()) { 453 // The klass has been inserted into the constant pool 454 // very recently. 455 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index)); 456 } else if (tag.is_symbol()) { 457 klass_name = symbolHandle(THREAD, cpool->symbol_at(index)); 458 } else { 459 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag"); 460 klass_name = symbolHandle(THREAD, cpool->unresolved_klass_at(index)); 461 } 462 } 463 } 464 465 if (klass.is_null()) { 466 // Not found in constant pool. Use the name to do the lookup. 467 ciKlass* k = get_klass_by_name_impl(accessor, 468 get_object(klass_name())->as_symbol(), 469 false); 470 // Calculate accessibility the hard way. 471 if (!k->is_loaded()) { 472 is_accessible = false; 473 } else if (k->loader() != accessor->loader() && 474 get_klass_by_name_impl(accessor, k->name(), true) == NULL) { 475 // Loaded only remotely. Not linked yet. 476 is_accessible = false; 477 } else { 478 // Linked locally, and we must also check public/private, etc. 479 is_accessible = check_klass_accessibility(accessor, k->get_klassOop()); 480 } 481 return k; 482 } 483 484 // Check for prior unloaded klass. The SystemDictionary's answers 485 // can vary over time but the compiler needs consistency. 486 ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol(); 487 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name); 488 if (unloaded_klass != NULL) { 489 is_accessible = false; 490 return unloaded_klass; 491 } 492 493 // It is known to be accessible, since it was found in the constant pool. 494 is_accessible = true; 495 return get_object(klass())->as_klass(); 496} 497 498// ------------------------------------------------------------------ 499// ciEnv::get_klass_by_index 500// 501// Get a klass from the constant pool. 502ciKlass* ciEnv::get_klass_by_index(constantPoolHandle cpool, 503 int index, 504 bool& is_accessible, 505 ciInstanceKlass* accessor) { 506 GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);) 507} 508 509// ------------------------------------------------------------------ 510// ciEnv::get_constant_by_index_impl 511// 512// Implementation of get_constant_by_index(). 513ciConstant ciEnv::get_constant_by_index_impl(constantPoolHandle cpool, 514 int index, 515 ciInstanceKlass* accessor) { 516 EXCEPTION_CONTEXT; 517 constantTag tag = cpool->tag_at(index); 518 if (tag.is_int()) { 519 return ciConstant(T_INT, (jint)cpool->int_at(index)); 520 } else if (tag.is_long()) { 521 return ciConstant((jlong)cpool->long_at(index)); 522 } else if (tag.is_float()) { 523 return ciConstant((jfloat)cpool->float_at(index)); 524 } else if (tag.is_double()) { 525 return ciConstant((jdouble)cpool->double_at(index)); 526 } else if (tag.is_string() || tag.is_unresolved_string()) { 527 oop string = NULL; 528 if (cpool->is_pseudo_string_at(index)) { 529 string = cpool->pseudo_string_at(index); 530 } else { 531 string = cpool->string_at(index, THREAD); 532 if (HAS_PENDING_EXCEPTION) { 533 CLEAR_PENDING_EXCEPTION; 534 record_out_of_memory_failure(); 535 return ciConstant(); 536 } 537 } 538 ciObject* constant = get_object(string); 539 assert (constant->is_instance(), "must be an instance, or not? "); 540 return ciConstant(T_OBJECT, constant); 541 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 542 // 4881222: allow ldc to take a class type 543 bool ignore; 544 ciKlass* klass = get_klass_by_index_impl(cpool, index, ignore, accessor); 545 if (HAS_PENDING_EXCEPTION) { 546 CLEAR_PENDING_EXCEPTION; 547 record_out_of_memory_failure(); 548 return ciConstant(); 549 } 550 assert (klass->is_instance_klass() || klass->is_array_klass(), 551 "must be an instance or array klass "); 552 return ciConstant(T_OBJECT, klass); 553 } else if (tag.is_object()) { 554 oop obj = cpool->object_at(index); 555 assert(obj->is_instance(), "must be an instance"); 556 ciObject* ciobj = get_object(obj); 557 return ciConstant(T_OBJECT, ciobj); 558 } else { 559 ShouldNotReachHere(); 560 return ciConstant(); 561 } 562} 563 564// ------------------------------------------------------------------ 565// ciEnv::is_unresolved_string_impl 566// 567// Implementation of is_unresolved_string(). 568bool ciEnv::is_unresolved_string_impl(instanceKlass* accessor, int index) const { 569 EXCEPTION_CONTEXT; 570 assert(accessor->is_linked(), "must be linked before accessing constant pool"); 571 constantPoolOop cpool = accessor->constants(); 572 constantTag tag = cpool->tag_at(index); 573 return tag.is_unresolved_string(); 574} 575 576// ------------------------------------------------------------------ 577// ciEnv::is_unresolved_klass_impl 578// 579// Implementation of is_unresolved_klass(). 580bool ciEnv::is_unresolved_klass_impl(instanceKlass* accessor, int index) const { 581 EXCEPTION_CONTEXT; 582 assert(accessor->is_linked(), "must be linked before accessing constant pool"); 583 constantPoolOop cpool = accessor->constants(); 584 constantTag tag = cpool->tag_at(index); 585 return tag.is_unresolved_klass(); 586} 587 588// ------------------------------------------------------------------ 589// ciEnv::get_constant_by_index 590// 591// Pull a constant out of the constant pool. How appropriate. 592// 593// Implementation note: this query is currently in no way cached. 594ciConstant ciEnv::get_constant_by_index(constantPoolHandle cpool, 595 int index, 596 ciInstanceKlass* accessor) { 597 GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, index, accessor);) 598} 599 600// ------------------------------------------------------------------ 601// ciEnv::is_unresolved_string 602// 603// Check constant pool 604// 605// Implementation note: this query is currently in no way cached. 606bool ciEnv::is_unresolved_string(ciInstanceKlass* accessor, 607 int index) const { 608 GUARDED_VM_ENTRY(return is_unresolved_string_impl(accessor->get_instanceKlass(), index); ) 609} 610 611// ------------------------------------------------------------------ 612// ciEnv::is_unresolved_klass 613// 614// Check constant pool 615// 616// Implementation note: this query is currently in no way cached. 617bool ciEnv::is_unresolved_klass(ciInstanceKlass* accessor, 618 int index) const { 619 GUARDED_VM_ENTRY(return is_unresolved_klass_impl(accessor->get_instanceKlass(), index); ) 620} 621 622// ------------------------------------------------------------------ 623// ciEnv::get_field_by_index_impl 624// 625// Implementation of get_field_by_index. 626// 627// Implementation note: the results of field lookups are cached 628// in the accessor klass. 629ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor, 630 int index) { 631 ciConstantPoolCache* cache = accessor->field_cache(); 632 if (cache == NULL) { 633 ciField* field = new (arena()) ciField(accessor, index); 634 return field; 635 } else { 636 ciField* field = (ciField*)cache->get(index); 637 if (field == NULL) { 638 field = new (arena()) ciField(accessor, index); 639 cache->insert(index, field); 640 } 641 return field; 642 } 643} 644 645// ------------------------------------------------------------------ 646// ciEnv::get_field_by_index 647// 648// Get a field by index from a klass's constant pool. 649ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor, 650 int index) { 651 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);) 652} 653 654// ------------------------------------------------------------------ 655// ciEnv::lookup_method 656// 657// Perform an appropriate method lookup based on accessor, holder, 658// name, signature, and bytecode. 659methodOop ciEnv::lookup_method(instanceKlass* accessor, 660 instanceKlass* holder, 661 symbolOop name, 662 symbolOop sig, 663 Bytecodes::Code bc) { 664 EXCEPTION_CONTEXT; 665 KlassHandle h_accessor(THREAD, accessor); 666 KlassHandle h_holder(THREAD, holder); 667 symbolHandle h_name(THREAD, name); 668 symbolHandle h_sig(THREAD, sig); 669 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL)); 670 methodHandle dest_method; 671 switch (bc) { 672 case Bytecodes::_invokestatic: 673 dest_method = 674 LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor); 675 break; 676 case Bytecodes::_invokespecial: 677 dest_method = 678 LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor); 679 break; 680 case Bytecodes::_invokeinterface: 681 dest_method = 682 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig, 683 h_accessor, true); 684 break; 685 case Bytecodes::_invokevirtual: 686 dest_method = 687 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig, 688 h_accessor, true); 689 break; 690 default: ShouldNotReachHere(); 691 } 692 693 return dest_method(); 694} 695 696 697// ------------------------------------------------------------------ 698// ciEnv::get_method_by_index_impl 699ciMethod* ciEnv::get_method_by_index_impl(constantPoolHandle cpool, 700 int index, Bytecodes::Code bc, 701 ciInstanceKlass* accessor) { 702 int holder_index = cpool->klass_ref_index_at(index); 703 bool holder_is_accessible; 704 ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor); 705 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder); 706 707 // Get the method's name and signature. 708 symbolOop name_sym = cpool->name_ref_at(index); 709 symbolOop sig_sym = cpool->signature_ref_at(index); 710 711 if (holder_is_accessible) { // Our declared holder is loaded. 712 instanceKlass* lookup = declared_holder->get_instanceKlass(); 713 methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc); 714 if (m != NULL) { 715 // We found the method. 716 return get_object(m)->as_method(); 717 } 718 } 719 720 // Either the declared holder was not loaded, or the method could 721 // not be found. Create a dummy ciMethod to represent the failed 722 // lookup. 723 724 return get_unloaded_method(declared_holder, 725 get_object(name_sym)->as_symbol(), 726 get_object(sig_sym)->as_symbol()); 727} 728 729 730// ------------------------------------------------------------------ 731// ciEnv::get_fake_invokedynamic_method_impl 732ciMethod* ciEnv::get_fake_invokedynamic_method_impl(constantPoolHandle cpool, 733 int index, Bytecodes::Code bc) { 734 assert(bc == Bytecodes::_invokedynamic, "must be invokedynamic"); 735 736 // Get the CallSite from the constant pool cache. 737 ConstantPoolCacheEntry* cpc_entry = cpool->cache()->secondary_entry_at(index); 738 assert(cpc_entry != NULL && cpc_entry->is_secondary_entry(), "sanity"); 739 Handle call_site = cpc_entry->f1(); 740 741 // Call site might not be linked yet. 742 if (call_site.is_null()) { 743 ciInstanceKlass* mh_klass = get_object(SystemDictionary::MethodHandle_klass())->as_instance_klass(); 744 ciSymbol* sig_sym = get_object(cpool->signature_ref_at(index))->as_symbol(); 745 return get_unloaded_method(mh_klass, ciSymbol::invoke_name(), sig_sym); 746 } 747 748 // Get the methodOop from the CallSite. 749 methodOop method_oop = (methodOop) java_dyn_CallSite::vmmethod(call_site()); 750 assert(method_oop != NULL, "sanity"); 751 assert(method_oop->is_method_handle_invoke(), "consistent"); 752 753 return get_object(method_oop)->as_method(); 754} 755 756 757// ------------------------------------------------------------------ 758// ciEnv::get_instance_klass_for_declared_method_holder 759ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) { 760 // For the case of <array>.clone(), the method holder can be a ciArrayKlass 761 // instead of a ciInstanceKlass. For that case simply pretend that the 762 // declared holder is Object.clone since that's where the call will bottom out. 763 // A more correct fix would trickle out through many interfaces in CI, 764 // requiring ciInstanceKlass* to become ciKlass* and many more places would 765 // require checks to make sure the expected type was found. Given that this 766 // only occurs for clone() the more extensive fix seems like overkill so 767 // instead we simply smear the array type into Object. 768 if (method_holder->is_instance_klass()) { 769 return method_holder->as_instance_klass(); 770 } else if (method_holder->is_array_klass()) { 771 return current()->Object_klass(); 772 } else { 773 ShouldNotReachHere(); 774 } 775 return NULL; 776} 777 778 779// ------------------------------------------------------------------ 780// ciEnv::get_method_by_index 781ciMethod* ciEnv::get_method_by_index(constantPoolHandle cpool, 782 int index, Bytecodes::Code bc, 783 ciInstanceKlass* accessor) { 784 if (bc == Bytecodes::_invokedynamic) { 785 GUARDED_VM_ENTRY(return get_fake_invokedynamic_method_impl(cpool, index, bc);) 786 } else { 787 GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);) 788 } 789} 790 791 792// ------------------------------------------------------------------ 793// ciEnv::name_buffer 794char *ciEnv::name_buffer(int req_len) { 795 if (_name_buffer_len < req_len) { 796 if (_name_buffer == NULL) { 797 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len); 798 _name_buffer_len = req_len; 799 } else { 800 _name_buffer = 801 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len); 802 _name_buffer_len = req_len; 803 } 804 } 805 return _name_buffer; 806} 807 808// ------------------------------------------------------------------ 809// ciEnv::is_in_vm 810bool ciEnv::is_in_vm() { 811 return JavaThread::current()->thread_state() == _thread_in_vm; 812} 813 814bool ciEnv::system_dictionary_modification_counter_changed() { 815 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications(); 816} 817 818// ------------------------------------------------------------------ 819// ciEnv::check_for_system_dictionary_modification 820// Check for changes to the system dictionary during compilation 821// class loads, evolution, breakpoints 822void ciEnv::check_for_system_dictionary_modification(ciMethod* target) { 823 if (failing()) return; // no need for further checks 824 825 // Dependencies must be checked when the system dictionary changes. 826 // If logging is enabled all violated dependences will be recorded in 827 // the log. In debug mode check dependencies even if the system 828 // dictionary hasn't changed to verify that no invalid dependencies 829 // were inserted. Any violated dependences in this case are dumped to 830 // the tty. 831 832 bool counter_changed = system_dictionary_modification_counter_changed(); 833 bool test_deps = counter_changed; 834 DEBUG_ONLY(test_deps = true); 835 if (!test_deps) return; 836 837 bool print_failures = false; 838 DEBUG_ONLY(print_failures = !counter_changed); 839 840 bool keep_going = (print_failures || xtty != NULL); 841 842 int violated = 0; 843 844 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) { 845 klassOop witness = deps.check_dependency(); 846 if (witness != NULL) { 847 ++violated; 848 if (print_failures) deps.print_dependency(witness, /*verbose=*/ true); 849 // If there's no log and we're not sanity-checking, we're done. 850 if (!keep_going) break; 851 } 852 } 853 854 if (violated != 0) { 855 assert(counter_changed, "failed dependencies, but counter didn't change"); 856 record_failure("concurrent class loading"); 857 } 858} 859 860// ------------------------------------------------------------------ 861// ciEnv::register_method 862void ciEnv::register_method(ciMethod* target, 863 int entry_bci, 864 CodeOffsets* offsets, 865 int orig_pc_offset, 866 CodeBuffer* code_buffer, 867 int frame_words, 868 OopMapSet* oop_map_set, 869 ExceptionHandlerTable* handler_table, 870 ImplicitExceptionTable* inc_table, 871 AbstractCompiler* compiler, 872 int comp_level, 873 bool has_debug_info, 874 bool has_unsafe_access) { 875 VM_ENTRY_MARK; 876 nmethod* nm = NULL; 877 { 878 // To prevent compile queue updates. 879 MutexLocker locker(MethodCompileQueue_lock, THREAD); 880 881 // Prevent SystemDictionary::add_to_hierarchy from running 882 // and invalidating our dependencies until we install this method. 883 MutexLocker ml(Compile_lock); 884 885 // Change in Jvmti state may invalidate compilation. 886 if (!failing() && 887 ( (!jvmti_can_hotswap_or_post_breakpoint() && 888 JvmtiExport::can_hotswap_or_post_breakpoint()) || 889 (!jvmti_can_access_local_variables() && 890 JvmtiExport::can_access_local_variables()) || 891 (!jvmti_can_post_on_exceptions() && 892 JvmtiExport::can_post_on_exceptions()) )) { 893 record_failure("Jvmti state change invalidated dependencies"); 894 } 895 896 // Change in DTrace flags may invalidate compilation. 897 if (!failing() && 898 ( (!dtrace_extended_probes() && ExtendedDTraceProbes) || 899 (!dtrace_method_probes() && DTraceMethodProbes) || 900 (!dtrace_alloc_probes() && DTraceAllocProbes) )) { 901 record_failure("DTrace flags change invalidated dependencies"); 902 } 903 904 if (!failing()) { 905 if (log() != NULL) { 906 // Log the dependencies which this compilation declares. 907 dependencies()->log_all_dependencies(); 908 } 909 910 // Encode the dependencies now, so we can check them right away. 911 dependencies()->encode_content_bytes(); 912 913 // Check for {class loads, evolution, breakpoints} during compilation 914 check_for_system_dictionary_modification(target); 915 } 916 917 methodHandle method(THREAD, target->get_methodOop()); 918 919 if (failing()) { 920 // While not a true deoptimization, it is a preemptive decompile. 921 methodDataOop mdo = method()->method_data(); 922 if (mdo != NULL) { 923 mdo->inc_decompile_count(); 924 } 925 926 // All buffers in the CodeBuffer are allocated in the CodeCache. 927 // If the code buffer is created on each compile attempt 928 // as in C2, then it must be freed. 929 code_buffer->free_blob(); 930 return; 931 } 932 933 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry"); 934 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry"); 935 936 nm = nmethod::new_nmethod(method, 937 compile_id(), 938 entry_bci, 939 offsets, 940 orig_pc_offset, 941 debug_info(), dependencies(), code_buffer, 942 frame_words, oop_map_set, 943 handler_table, inc_table, 944 compiler, comp_level); 945 946 // Free codeBlobs 947 code_buffer->free_blob(); 948 949 // stress test 6243940 by immediately making the method 950 // non-entrant behind the system's back. This has serious 951 // side effects on the code cache and is not meant for 952 // general stress testing 953 if (nm != NULL && StressNonEntrant) { 954 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 955 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(), 956 SharedRuntime::get_handle_wrong_method_stub()); 957 } 958 959 if (nm == NULL) { 960 // The CodeCache is full. Print out warning and disable compilation. 961 record_failure("code cache is full"); 962 { 963 MutexUnlocker ml(Compile_lock); 964 MutexUnlocker locker(MethodCompileQueue_lock); 965 CompileBroker::handle_full_code_cache(); 966 } 967 } else { 968 NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); ) 969 nm->set_has_unsafe_access(has_unsafe_access); 970 971 // Record successful registration. 972 // (Put nm into the task handle *before* publishing to the Java heap.) 973 if (task() != NULL) task()->set_code(nm); 974 975 if (entry_bci == InvocationEntryBci) { 976#ifdef TIERED 977 // If there is an old version we're done with it 978 nmethod* old = method->code(); 979 if (TraceMethodReplacement && old != NULL) { 980 ResourceMark rm; 981 char *method_name = method->name_and_sig_as_C_string(); 982 tty->print_cr("Replacing method %s", method_name); 983 } 984 if (old != NULL ) { 985 old->make_not_entrant(); 986 } 987#endif // TIERED 988 if (TraceNMethodInstalls ) { 989 ResourceMark rm; 990 char *method_name = method->name_and_sig_as_C_string(); 991 ttyLocker ttyl; 992 tty->print_cr("Installing method (%d) %s ", 993 comp_level, 994 method_name); 995 } 996 // Allow the code to be executed 997 method->set_code(method, nm); 998 } else { 999 if (TraceNMethodInstalls ) { 1000 ResourceMark rm; 1001 char *method_name = method->name_and_sig_as_C_string(); 1002 ttyLocker ttyl; 1003 tty->print_cr("Installing osr method (%d) %s @ %d", 1004 comp_level, 1005 method_name, 1006 entry_bci); 1007 } 1008 instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm); 1009 1010 } 1011 } 1012 } 1013 // JVMTI -- compiled method notification (must be done outside lock) 1014 if (nm != NULL) { 1015 nm->post_compiled_method_load_event(); 1016 } 1017 1018} 1019 1020 1021// ------------------------------------------------------------------ 1022// ciEnv::find_system_klass 1023ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) { 1024 VM_ENTRY_MARK; 1025 return get_klass_by_name_impl(NULL, klass_name, false); 1026} 1027 1028// ------------------------------------------------------------------ 1029// ciEnv::comp_level 1030int ciEnv::comp_level() { 1031 if (task() == NULL) return CompLevel_full_optimization; 1032 return task()->comp_level(); 1033} 1034 1035// ------------------------------------------------------------------ 1036// ciEnv::compile_id 1037uint ciEnv::compile_id() { 1038 if (task() == NULL) return 0; 1039 return task()->compile_id(); 1040} 1041 1042// ------------------------------------------------------------------ 1043// ciEnv::notice_inlined_method() 1044void ciEnv::notice_inlined_method(ciMethod* method) { 1045 _num_inlined_bytecodes += method->code_size(); 1046} 1047 1048// ------------------------------------------------------------------ 1049// ciEnv::num_inlined_bytecodes() 1050int ciEnv::num_inlined_bytecodes() const { 1051 return _num_inlined_bytecodes; 1052} 1053 1054// ------------------------------------------------------------------ 1055// ciEnv::record_failure() 1056void ciEnv::record_failure(const char* reason) { 1057 if (log() != NULL) { 1058 log()->elem("failure reason='%s'", reason); 1059 } 1060 if (_failure_reason == NULL) { 1061 // Record the first failure reason. 1062 _failure_reason = reason; 1063 } 1064} 1065 1066// ------------------------------------------------------------------ 1067// ciEnv::record_method_not_compilable() 1068void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) { 1069 int new_compilable = 1070 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ; 1071 1072 // Only note transitions to a worse state 1073 if (new_compilable > _compilable) { 1074 if (log() != NULL) { 1075 if (all_tiers) { 1076 log()->elem("method_not_compilable"); 1077 } else { 1078 log()->elem("method_not_compilable_at_tier"); 1079 } 1080 } 1081 _compilable = new_compilable; 1082 1083 // Reset failure reason; this one is more important. 1084 _failure_reason = NULL; 1085 record_failure(reason); 1086 } 1087} 1088 1089// ------------------------------------------------------------------ 1090// ciEnv::record_out_of_memory_failure() 1091void ciEnv::record_out_of_memory_failure() { 1092 // If memory is low, we stop compiling methods. 1093 record_method_not_compilable("out of memory"); 1094} 1095