1 /* 2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "ci/ciConstant.hpp" 27 #include "ci/ciEnv.hpp" 28 #include "ci/ciField.hpp" 29 #include "ci/ciInstance.hpp" 30 #include "ci/ciInstanceKlass.hpp" 31 #include "ci/ciInstanceKlassKlass.hpp" 32 #include "ci/ciMethod.hpp" 33 #include "ci/ciNullObject.hpp" 34 #include "ci/ciObjArrayKlassKlass.hpp" 35 #include "ci/ciTypeArrayKlassKlass.hpp" 36 #include "ci/ciUtilities.hpp" 37 #include "classfile/systemDictionary.hpp" 38 #include "classfile/vmSymbols.hpp" 39 #include "code/scopeDesc.hpp" 40 #include "compiler/compileBroker.hpp" 41 #include "compiler/compileLog.hpp" 42 #include "compiler/compilerOracle.hpp" 43 #include "gc_interface/collectedHeap.inline.hpp" 44 #include "interpreter/linkResolver.hpp" 45 #include "memory/allocation.inline.hpp" 46 #include "memory/oopFactory.hpp" 47 #include "memory/universe.inline.hpp" 48 #include "oops/methodDataOop.hpp" 49 #include "oops/objArrayKlass.hpp" 50 #include "oops/oop.inline.hpp" 51 #include "oops/oop.inline2.hpp" 52 #include "prims/jvmtiExport.hpp" 53 #include "prims/methodHandleWalk.hpp" 54 #include "runtime/init.hpp" 55 #include "runtime/reflection.hpp" 56 #include "runtime/sharedRuntime.hpp" 57 #include "utilities/dtrace.hpp" 58 #ifdef COMPILER1 59 #include "c1/c1_Runtime1.hpp" 60 #endif 61 #ifdef COMPILER2 62 #include "opto/runtime.hpp" 63 #endif 64 65 // ciEnv 66 // 67 // This class is the top level broker for requests from the compiler 68 // to the VM. 69 70 ciObject* ciEnv::_null_object_instance; 71 ciMethodKlass* ciEnv::_method_klass_instance; 72 ciKlassKlass* ciEnv::_klass_klass_instance; 73 ciInstanceKlassKlass* ciEnv::_instance_klass_klass_instance; 74 ciTypeArrayKlassKlass* ciEnv::_type_array_klass_klass_instance; 75 ciObjArrayKlassKlass* ciEnv::_obj_array_klass_klass_instance; 76 77 #define WK_KLASS_DEFN(name, ignore_s, ignore_o) ciInstanceKlass* ciEnv::_##name = NULL; 78 WK_KLASSES_DO(WK_KLASS_DEFN) 79 #undef WK_KLASS_DEFN 80 81 ciSymbol* ciEnv::_unloaded_cisymbol = NULL; 82 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL; 83 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL; 84 85 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL; 86 jobject ciEnv::_ArrayStoreException_handle = NULL; 87 jobject ciEnv::_ClassCastException_handle = NULL; 88 89 #ifndef PRODUCT 90 static bool firstEnv = true; 91 #endif /* PRODUCT */ 92 93 // ------------------------------------------------------------------ 94 // ciEnv::ciEnv 95 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) { 96 VM_ENTRY_MARK; 97 98 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc. 99 thread->set_env(this); 100 assert(ciEnv::current() == this, "sanity"); 101 102 _oop_recorder = NULL; 103 _debug_info = NULL; 104 _dependencies = NULL; 105 _failure_reason = NULL; 106 _compilable = MethodCompilable; 107 _break_at_compile = false; 108 _compiler_data = NULL; 109 #ifndef PRODUCT 110 assert(!firstEnv, "not initialized properly"); 111 #endif /* !PRODUCT */ 112 113 _system_dictionary_modification_counter = system_dictionary_modification_counter; 114 _num_inlined_bytecodes = 0; 115 assert(task == NULL || thread->task() == task, "sanity"); 116 _task = task; 117 _log = NULL; 118 119 // Temporary buffer for creating symbols and such. 120 _name_buffer = NULL; 121 _name_buffer_len = 0; 122 123 _arena = &_ciEnv_arena; 124 _factory = new (_arena) ciObjectFactory(_arena, 128); 125 126 // Preload commonly referenced system ciObjects. 127 128 // During VM initialization, these instances have not yet been created. 129 // Assertions ensure that these instances are not accessed before 130 // their initialization. 131 132 assert(Universe::is_fully_initialized(), "should be complete"); 133 134 oop o = Universe::null_ptr_exception_instance(); 135 assert(o != NULL, "should have been initialized"); 136 _NullPointerException_instance = get_object(o)->as_instance(); 137 o = Universe::arithmetic_exception_instance(); 138 assert(o != NULL, "should have been initialized"); 139 _ArithmeticException_instance = get_object(o)->as_instance(); 140 141 _ArrayIndexOutOfBoundsException_instance = NULL; 142 _ArrayStoreException_instance = NULL; 143 _ClassCastException_instance = NULL; 144 _the_null_string = NULL; 145 _the_min_jint_string = NULL; 146 } 147 148 ciEnv::ciEnv(Arena* arena) { 149 ASSERT_IN_VM; 150 151 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc. 152 CompilerThread* current_thread = CompilerThread::current(); 153 assert(current_thread->env() == NULL, "must be"); 154 current_thread->set_env(this); 155 assert(ciEnv::current() == this, "sanity"); 156 157 _oop_recorder = NULL; 158 _debug_info = NULL; 159 _dependencies = NULL; 160 _failure_reason = NULL; 161 _compilable = MethodCompilable_never; 162 _break_at_compile = false; 163 _compiler_data = NULL; 164 #ifndef PRODUCT 165 assert(firstEnv, "must be first"); 166 firstEnv = false; 167 #endif /* !PRODUCT */ 168 169 _system_dictionary_modification_counter = 0; 170 _num_inlined_bytecodes = 0; 171 _task = NULL; 172 _log = NULL; 173 174 // Temporary buffer for creating symbols and such. 175 _name_buffer = NULL; 176 _name_buffer_len = 0; 177 178 _arena = arena; 179 _factory = new (_arena) ciObjectFactory(_arena, 128); 180 181 // Preload commonly referenced system ciObjects. 182 183 // During VM initialization, these instances have not yet been created. 184 // Assertions ensure that these instances are not accessed before 185 // their initialization. 186 187 assert(Universe::is_fully_initialized(), "must be"); 188 189 oop o = Universe::null_ptr_exception_instance(); 190 assert(o != NULL, "should have been initialized"); 191 _NullPointerException_instance = get_object(o)->as_instance(); 192 o = Universe::arithmetic_exception_instance(); 193 assert(o != NULL, "should have been initialized"); 194 _ArithmeticException_instance = get_object(o)->as_instance(); 195 196 _ArrayIndexOutOfBoundsException_instance = NULL; 197 _ArrayStoreException_instance = NULL; 198 _ClassCastException_instance = NULL; 199 _the_null_string = NULL; 200 _the_min_jint_string = NULL; 201 } 202 203 ciEnv::~ciEnv() { 204 CompilerThread* current_thread = CompilerThread::current(); 205 _factory->remove_symbols(); 206 current_thread->set_env(NULL); 207 } 208 209 // ------------------------------------------------------------------ 210 // Cache Jvmti state 211 void ciEnv::cache_jvmti_state() { 212 VM_ENTRY_MARK; 213 // Get Jvmti capabilities under lock to get consistant values. 214 MutexLocker mu(JvmtiThreadState_lock); 215 _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint(); 216 _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables(); 217 _jvmti_can_post_on_exceptions = JvmtiExport::can_post_on_exceptions(); 218 } 219 220 // ------------------------------------------------------------------ 221 // Cache DTrace flags 222 void ciEnv::cache_dtrace_flags() { 223 // Need lock? 224 _dtrace_extended_probes = ExtendedDTraceProbes; 225 if (_dtrace_extended_probes) { 226 _dtrace_monitor_probes = true; 227 _dtrace_method_probes = true; 228 _dtrace_alloc_probes = true; 229 } else { 230 _dtrace_monitor_probes = DTraceMonitorProbes; 231 _dtrace_method_probes = DTraceMethodProbes; 232 _dtrace_alloc_probes = DTraceAllocProbes; 233 } 234 } 235 236 // ------------------------------------------------------------------ 237 // helper for lazy exception creation 238 ciInstance* ciEnv::get_or_create_exception(jobject& handle, Symbol* name) { 239 VM_ENTRY_MARK; 240 if (handle == NULL) { 241 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance. 242 klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD); 243 jobject objh = NULL; 244 if (!HAS_PENDING_EXCEPTION && k != NULL) { 245 oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD); 246 if (!HAS_PENDING_EXCEPTION) 247 objh = JNIHandles::make_global(obj); 248 } 249 if (HAS_PENDING_EXCEPTION) { 250 CLEAR_PENDING_EXCEPTION; 251 } else { 252 handle = objh; 253 } 254 } 255 oop obj = JNIHandles::resolve(handle); 256 return obj == NULL? NULL: get_object(obj)->as_instance(); 257 } 258 259 // ------------------------------------------------------------------ 260 // ciEnv::ArrayIndexOutOfBoundsException_instance, etc. 261 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() { 262 if (_ArrayIndexOutOfBoundsException_instance == NULL) { 263 _ArrayIndexOutOfBoundsException_instance 264 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle, 265 vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); 266 } 267 return _ArrayIndexOutOfBoundsException_instance; 268 } 269 ciInstance* ciEnv::ArrayStoreException_instance() { 270 if (_ArrayStoreException_instance == NULL) { 271 _ArrayStoreException_instance 272 = get_or_create_exception(_ArrayStoreException_handle, 273 vmSymbols::java_lang_ArrayStoreException()); 274 } 275 return _ArrayStoreException_instance; 276 } 277 ciInstance* ciEnv::ClassCastException_instance() { 278 if (_ClassCastException_instance == NULL) { 279 _ClassCastException_instance 280 = get_or_create_exception(_ClassCastException_handle, 281 vmSymbols::java_lang_ClassCastException()); 282 } 283 return _ClassCastException_instance; 284 } 285 286 ciInstance* ciEnv::the_null_string() { 287 if (_the_null_string == NULL) { 288 VM_ENTRY_MARK; 289 _the_null_string = get_object(Universe::the_null_string())->as_instance(); 290 } 291 return _the_null_string; 292 } 293 294 ciInstance* ciEnv::the_min_jint_string() { 295 if (_the_min_jint_string == NULL) { 296 VM_ENTRY_MARK; 297 _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance(); 298 } 299 return _the_min_jint_string; 300 } 301 302 // ------------------------------------------------------------------ 303 // ciEnv::get_method_from_handle 304 ciMethod* ciEnv::get_method_from_handle(jobject method) { 305 VM_ENTRY_MARK; 306 return get_object(JNIHandles::resolve(method))->as_method(); 307 } 308 309 // ------------------------------------------------------------------ 310 // ciEnv::make_array 311 ciArray* ciEnv::make_system_array(GrowableArray<ciObject*>* objects) { 312 VM_ENTRY_MARK; 313 int length = objects->length(); 314 objArrayOop a = oopFactory::new_system_objArray(length, THREAD); 315 if (HAS_PENDING_EXCEPTION) { 316 CLEAR_PENDING_EXCEPTION; 317 record_out_of_memory_failure(); 318 return NULL; 319 } 320 for (int i = 0; i < length; i++) { 321 a->obj_at_put(i, objects->at(i)->get_oop()); 322 } 323 assert(a->is_perm(), ""); 324 return get_object(a)->as_array(); 325 } 326 327 328 // ------------------------------------------------------------------ 329 // ciEnv::array_element_offset_in_bytes 330 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) { 331 VM_ENTRY_MARK; 332 objArrayOop a = (objArrayOop)a_h->get_oop(); 333 assert(a->is_objArray(), ""); 334 int length = a->length(); 335 oop o = o_h->get_oop(); 336 for (int i = 0; i < length; i++) { 337 if (a->obj_at(i) == o) return i; 338 } 339 return -1; 340 } 341 342 343 // ------------------------------------------------------------------ 344 // ciEnv::check_klass_accessiblity 345 // 346 // Note: the logic of this method should mirror the logic of 347 // constantPoolOopDesc::verify_constant_pool_resolve. 348 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass, 349 klassOop resolved_klass) { 350 if (accessing_klass == NULL || !accessing_klass->is_loaded()) { 351 return true; 352 } 353 if (accessing_klass->is_obj_array()) { 354 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass(); 355 } 356 if (!accessing_klass->is_instance_klass()) { 357 return true; 358 } 359 360 if (resolved_klass->klass_part()->oop_is_objArray()) { 361 // Find the element klass, if this is an array. 362 resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass(); 363 } 364 if (resolved_klass->klass_part()->oop_is_instance()) { 365 return Reflection::verify_class_access(accessing_klass->get_klassOop(), 366 resolved_klass, 367 true); 368 } 369 return true; 370 } 371 372 // ------------------------------------------------------------------ 373 // ciEnv::get_klass_by_name_impl 374 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass, 375 constantPoolHandle cpool, 376 ciSymbol* name, 377 bool require_local) { 378 ASSERT_IN_VM; 379 EXCEPTION_CONTEXT; 380 381 // Now we need to check the SystemDictionary 382 Symbol* sym = name->get_symbol(); 383 if (sym->byte_at(0) == 'L' && 384 sym->byte_at(sym->utf8_length()-1) == ';') { 385 // This is a name from a signature. Strip off the trimmings. 386 // Call recursive to keep scope of strippedsym. 387 TempNewSymbol strippedsym = SymbolTable::new_symbol(sym->as_utf8()+1, 388 sym->utf8_length()-2, 389 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass)); 390 ciSymbol* strippedname = get_symbol(strippedsym); 391 return get_klass_by_name_impl(accessing_klass, cpool, strippedname, require_local); 392 } 393 394 // Check for prior unloaded klass. The SystemDictionary's answers 395 // can vary over time but the compiler needs consistency. 396 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name); 397 if (unloaded_klass != NULL) { 398 if (require_local) return NULL; 399 return unloaded_klass; 400 } 401 402 Handle loader(THREAD, (oop)NULL); 403 Handle domain(THREAD, (oop)NULL); 404 if (accessing_klass != NULL) { 405 loader = Handle(THREAD, accessing_klass->loader()); 406 domain = Handle(THREAD, accessing_klass->protection_domain()); 407 } 408 409 // setup up the proper type to return on OOM 410 ciKlass* fail_type; 411 if (sym->byte_at(0) == '[') { 412 fail_type = _unloaded_ciobjarrayklass; 413 } else { 414 fail_type = _unloaded_ciinstance_klass; 415 } 416 KlassHandle found_klass; 417 { 418 ttyUnlocker ttyul; // release tty lock to avoid ordering problems 419 MutexLocker ml(Compile_lock); 420 klassOop kls; 421 if (!require_local) { 422 kls = SystemDictionary::find_constrained_instance_or_array_klass(sym, loader, 423 KILL_COMPILE_ON_FATAL_(fail_type)); 424 } else { 425 kls = SystemDictionary::find_instance_or_array_klass(sym, loader, domain, 426 KILL_COMPILE_ON_FATAL_(fail_type)); 427 } 428 found_klass = KlassHandle(THREAD, kls); 429 } 430 431 // If we fail to find an array klass, look again for its element type. 432 // The element type may be available either locally or via constraints. 433 // In either case, if we can find the element type in the system dictionary, 434 // we must build an array type around it. The CI requires array klasses 435 // to be loaded if their element klasses are loaded, except when memory 436 // is exhausted. 437 if (sym->byte_at(0) == '[' && 438 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) { 439 // We have an unloaded array. 440 // Build it on the fly if the element class exists. 441 TempNewSymbol elem_sym = SymbolTable::new_symbol(sym->as_utf8()+1, 442 sym->utf8_length()-1, 443 KILL_COMPILE_ON_FATAL_(fail_type)); 444 445 // Get element ciKlass recursively. 446 ciKlass* elem_klass = 447 get_klass_by_name_impl(accessing_klass, 448 cpool, 449 get_symbol(elem_sym), 450 require_local); 451 if (elem_klass != NULL && elem_klass->is_loaded()) { 452 // Now make an array for it 453 return ciObjArrayKlass::make_impl(elem_klass); 454 } 455 } 456 457 if (found_klass() == NULL && !cpool.is_null() && cpool->has_preresolution()) { 458 // Look inside the constant pool for pre-resolved class entries. 459 for (int i = cpool->length() - 1; i >= 1; i--) { 460 if (cpool->tag_at(i).is_klass()) { 461 klassOop kls = cpool->resolved_klass_at(i); 462 if (Klass::cast(kls)->name() == sym) { 463 found_klass = KlassHandle(THREAD, kls); 464 break; 465 } 466 } 467 } 468 } 469 470 if (found_klass() != NULL) { 471 // Found it. Build a CI handle. 472 return get_object(found_klass())->as_klass(); 473 } 474 475 if (require_local) return NULL; 476 // Not yet loaded into the VM, or not governed by loader constraints. 477 // Make a CI representative for it. 478 return get_unloaded_klass(accessing_klass, name); 479 } 480 481 // ------------------------------------------------------------------ 482 // ciEnv::get_klass_by_name 483 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass, 484 ciSymbol* klass_name, 485 bool require_local) { 486 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass, 487 constantPoolHandle(), 488 klass_name, 489 require_local);) 490 } 491 492 // ------------------------------------------------------------------ 493 // ciEnv::get_klass_by_index_impl 494 // 495 // Implementation of get_klass_by_index. 496 ciKlass* ciEnv::get_klass_by_index_impl(constantPoolHandle cpool, 497 int index, 498 bool& is_accessible, 499 ciInstanceKlass* accessor) { 500 EXCEPTION_CONTEXT; 501 KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index)); 502 Symbol* klass_name = NULL; 503 if (klass.is_null()) { 504 // The klass has not been inserted into the constant pool. 505 // Try to look it up by name. 506 { 507 // We have to lock the cpool to keep the oop from being resolved 508 // while we are accessing it. 509 ObjectLocker ol(cpool, THREAD); 510 511 constantTag tag = cpool->tag_at(index); 512 if (tag.is_klass()) { 513 // The klass has been inserted into the constant pool 514 // very recently. 515 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index)); 516 } else if (tag.is_symbol()) { 517 klass_name = cpool->symbol_at(index); 518 } else { 519 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag"); 520 klass_name = cpool->unresolved_klass_at(index); 521 } 522 } 523 } 524 525 if (klass.is_null()) { 526 // Not found in constant pool. Use the name to do the lookup. 527 ciKlass* k = get_klass_by_name_impl(accessor, 528 cpool, 529 get_symbol(klass_name), 530 false); 531 // Calculate accessibility the hard way. 532 if (!k->is_loaded()) { 533 is_accessible = false; 534 } else if (k->loader() != accessor->loader() && 535 get_klass_by_name_impl(accessor, cpool, k->name(), true) == NULL) { 536 // Loaded only remotely. Not linked yet. 537 is_accessible = false; 538 } else { 539 // Linked locally, and we must also check public/private, etc. 540 is_accessible = check_klass_accessibility(accessor, k->get_klassOop()); 541 } 542 return k; 543 } 544 545 // Check for prior unloaded klass. The SystemDictionary's answers 546 // can vary over time but the compiler needs consistency. 547 ciSymbol* name = get_symbol(klass()->klass_part()->name()); 548 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name); 549 if (unloaded_klass != NULL) { 550 is_accessible = false; 551 return unloaded_klass; 552 } 553 554 // It is known to be accessible, since it was found in the constant pool. 555 is_accessible = true; 556 return get_object(klass())->as_klass(); 557 } 558 559 // ------------------------------------------------------------------ 560 // ciEnv::get_klass_by_index 561 // 562 // Get a klass from the constant pool. 563 ciKlass* ciEnv::get_klass_by_index(constantPoolHandle cpool, 564 int index, 565 bool& is_accessible, 566 ciInstanceKlass* accessor) { 567 GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);) 568 } 569 570 // ------------------------------------------------------------------ 571 // ciEnv::get_constant_by_index_impl 572 // 573 // Implementation of get_constant_by_index(). 574 ciConstant ciEnv::get_constant_by_index_impl(constantPoolHandle cpool, 575 int pool_index, int cache_index, 576 ciInstanceKlass* accessor) { 577 bool ignore_will_link; 578 EXCEPTION_CONTEXT; 579 int index = pool_index; 580 if (cache_index >= 0) { 581 assert(index < 0, "only one kind of index at a time"); 582 ConstantPoolCacheEntry* cpc_entry = cpool->cache()->entry_at(cache_index); 583 index = cpc_entry->constant_pool_index(); 584 oop obj = cpc_entry->f1(); 585 if (obj != NULL) { 586 assert(obj->is_instance() || obj->is_array(), "must be a Java reference"); 587 ciObject* ciobj = get_object(obj); 588 return ciConstant(T_OBJECT, ciobj); 589 } 590 } 591 constantTag tag = cpool->tag_at(index); 592 if (tag.is_int()) { 593 return ciConstant(T_INT, (jint)cpool->int_at(index)); 594 } else if (tag.is_long()) { 595 return ciConstant((jlong)cpool->long_at(index)); 596 } else if (tag.is_float()) { 597 return ciConstant((jfloat)cpool->float_at(index)); 598 } else if (tag.is_double()) { 599 return ciConstant((jdouble)cpool->double_at(index)); 600 } else if (tag.is_string() || tag.is_unresolved_string()) { 601 oop string = NULL; 602 if (cpool->is_pseudo_string_at(index)) { 603 string = cpool->pseudo_string_at(index); 604 } else { 605 string = cpool->string_at(index, THREAD); 606 if (HAS_PENDING_EXCEPTION) { 607 CLEAR_PENDING_EXCEPTION; 608 record_out_of_memory_failure(); 609 return ciConstant(); 610 } 611 } 612 ciObject* constant = get_object(string); 613 assert (constant->is_instance(), "must be an instance, or not? "); 614 return ciConstant(T_OBJECT, constant); 615 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 616 // 4881222: allow ldc to take a class type 617 ciKlass* klass = get_klass_by_index_impl(cpool, index, ignore_will_link, accessor); 618 if (HAS_PENDING_EXCEPTION) { 619 CLEAR_PENDING_EXCEPTION; 620 record_out_of_memory_failure(); 621 return ciConstant(); 622 } 623 assert (klass->is_instance_klass() || klass->is_array_klass(), 624 "must be an instance or array klass "); 625 return ciConstant(T_OBJECT, klass->java_mirror()); 626 } else if (tag.is_object()) { 627 oop obj = cpool->object_at(index); 628 assert(obj->is_instance() || obj->is_array(), "must be a Java reference"); 629 ciObject* ciobj = get_object(obj); 630 return ciConstant(T_OBJECT, ciobj); 631 } else if (tag.is_method_type()) { 632 // must execute Java code to link this CP entry into cache[i].f1 633 ciSymbol* signature = get_symbol(cpool->method_type_signature_at(index)); 634 ciObject* ciobj = get_unloaded_method_type_constant(signature); 635 return ciConstant(T_OBJECT, ciobj); 636 } else if (tag.is_method_handle()) { 637 // must execute Java code to link this CP entry into cache[i].f1 638 int ref_kind = cpool->method_handle_ref_kind_at(index); 639 int callee_index = cpool->method_handle_klass_index_at(index); 640 ciKlass* callee = get_klass_by_index_impl(cpool, callee_index, ignore_will_link, accessor); 641 ciSymbol* name = get_symbol(cpool->method_handle_name_ref_at(index)); 642 ciSymbol* signature = get_symbol(cpool->method_handle_signature_ref_at(index)); 643 ciObject* ciobj = get_unloaded_method_handle_constant(callee, name, signature, ref_kind); 644 return ciConstant(T_OBJECT, ciobj); 645 } else { 646 ShouldNotReachHere(); 647 return ciConstant(); 648 } 649 } 650 651 // ------------------------------------------------------------------ 652 // ciEnv::get_constant_by_index 653 // 654 // Pull a constant out of the constant pool. How appropriate. 655 // 656 // Implementation note: this query is currently in no way cached. 657 ciConstant ciEnv::get_constant_by_index(constantPoolHandle cpool, 658 int pool_index, int cache_index, 659 ciInstanceKlass* accessor) { 660 GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, pool_index, cache_index, accessor);) 661 } 662 663 // ------------------------------------------------------------------ 664 // ciEnv::get_field_by_index_impl 665 // 666 // Implementation of get_field_by_index. 667 // 668 // Implementation note: the results of field lookups are cached 669 // in the accessor klass. 670 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor, 671 int index) { 672 ciConstantPoolCache* cache = accessor->field_cache(); 673 if (cache == NULL) { 674 ciField* field = new (arena()) ciField(accessor, index); 675 return field; 676 } else { 677 ciField* field = (ciField*)cache->get(index); 678 if (field == NULL) { 679 field = new (arena()) ciField(accessor, index); 680 cache->insert(index, field); 681 } 682 return field; 683 } 684 } 685 686 // ------------------------------------------------------------------ 687 // ciEnv::get_field_by_index 688 // 689 // Get a field by index from a klass's constant pool. 690 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor, 691 int index) { 692 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);) 693 } 694 695 // ------------------------------------------------------------------ 696 // ciEnv::lookup_method 697 // 698 // Perform an appropriate method lookup based on accessor, holder, 699 // name, signature, and bytecode. 700 methodOop ciEnv::lookup_method(instanceKlass* accessor, 701 instanceKlass* holder, 702 Symbol* name, 703 Symbol* sig, 704 Bytecodes::Code bc) { 705 EXCEPTION_CONTEXT; 706 KlassHandle h_accessor(THREAD, accessor); 707 KlassHandle h_holder(THREAD, holder); 708 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL)); 709 methodHandle dest_method; 710 switch (bc) { 711 case Bytecodes::_invokestatic: 712 dest_method = 713 LinkResolver::resolve_static_call_or_null(h_holder, name, sig, h_accessor); 714 break; 715 case Bytecodes::_invokespecial: 716 dest_method = 717 LinkResolver::resolve_special_call_or_null(h_holder, name, sig, h_accessor); 718 break; 719 case Bytecodes::_invokeinterface: 720 dest_method = 721 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, name, sig, 722 h_accessor, true); 723 break; 724 case Bytecodes::_invokevirtual: 725 dest_method = 726 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, name, sig, 727 h_accessor, true); 728 break; 729 default: ShouldNotReachHere(); 730 } 731 732 return dest_method(); 733 } 734 735 736 // ------------------------------------------------------------------ 737 // ciEnv::get_method_by_index_impl 738 ciMethod* ciEnv::get_method_by_index_impl(constantPoolHandle cpool, 739 int index, Bytecodes::Code bc, 740 ciInstanceKlass* accessor) { 741 int holder_index = cpool->klass_ref_index_at(index); 742 bool holder_is_accessible; 743 ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor); 744 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder); 745 746 // Get the method's name and signature. 747 Symbol* name_sym = cpool->name_ref_at(index); 748 Symbol* sig_sym = cpool->signature_ref_at(index); 749 750 if (cpool->has_preresolution() 751 || (holder == ciEnv::MethodHandle_klass() && 752 methodOopDesc::is_method_handle_invoke_name(name_sym))) { 753 // Short-circuit lookups for JSR 292-related call sites. 754 // That is, do not rely only on name-based lookups, because they may fail 755 // if the names are not resolvable in the boot class loader (7056328). 756 switch (bc) { 757 case Bytecodes::_invokevirtual: 758 case Bytecodes::_invokeinterface: 759 case Bytecodes::_invokespecial: 760 case Bytecodes::_invokestatic: 761 { 762 methodOop m = constantPoolOopDesc::method_at_if_loaded(cpool, index, bc); 763 if (m != NULL) { 764 return get_object(m)->as_method(); 765 } 766 } 767 } 768 } 769 770 if (holder_is_accessible) { // Our declared holder is loaded. 771 instanceKlass* lookup = declared_holder->get_instanceKlass(); 772 methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc); 773 if (m != NULL && 774 (bc == Bytecodes::_invokestatic 775 ? instanceKlass::cast(m->method_holder())->is_not_initialized() 776 : !instanceKlass::cast(m->method_holder())->is_loaded())) { 777 m = NULL; 778 } 779 if (m != NULL) { 780 // We found the method. 781 return get_object(m)->as_method(); 782 } 783 } 784 785 // Either the declared holder was not loaded, or the method could 786 // not be found. Create a dummy ciMethod to represent the failed 787 // lookup. 788 789 return get_unloaded_method(declared_holder, 790 get_symbol(name_sym), 791 get_symbol(sig_sym)); 792 } 793 794 795 // ------------------------------------------------------------------ 796 // ciEnv::get_fake_invokedynamic_method_impl 797 ciMethod* ciEnv::get_fake_invokedynamic_method_impl(constantPoolHandle cpool, 798 int index, Bytecodes::Code bc) { 799 // Compare the following logic with InterpreterRuntime::resolve_invokedynamic. 800 assert(bc == Bytecodes::_invokedynamic, "must be invokedynamic"); 801 802 bool is_resolved = cpool->cache()->main_entry_at(index)->is_resolved(bc); 803 if (is_resolved && cpool->cache()->secondary_entry_at(index)->is_f1_null()) 804 // FIXME: code generation could allow for null (unlinked) call site 805 is_resolved = false; 806 807 // Call site might not be resolved yet. We could create a real invoker method from the 808 // compiler, but it is simpler to stop the code path here with an unlinked method. 809 if (!is_resolved) { 810 ciInstanceKlass* mh_klass = get_object(SystemDictionary::MethodHandle_klass())->as_instance_klass(); 811 ciSymbol* sig_sym = get_symbol(cpool->signature_ref_at(index)); 812 return get_unloaded_method(mh_klass, ciSymbol::invokeExact_name(), sig_sym); 813 } 814 815 // Get the invoker methodOop from the constant pool. 816 oop f1_value = cpool->cache()->main_entry_at(index)->f1(); 817 methodOop signature_invoker = (methodOop) f1_value; 818 assert(signature_invoker != NULL && signature_invoker->is_method() && signature_invoker->is_method_handle_invoke(), 819 "correct result from LinkResolver::resolve_invokedynamic"); 820 821 return get_object(signature_invoker)->as_method(); 822 } 823 824 825 // ------------------------------------------------------------------ 826 // ciEnv::get_instance_klass_for_declared_method_holder 827 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) { 828 // For the case of <array>.clone(), the method holder can be a ciArrayKlass 829 // instead of a ciInstanceKlass. For that case simply pretend that the 830 // declared holder is Object.clone since that's where the call will bottom out. 831 // A more correct fix would trickle out through many interfaces in CI, 832 // requiring ciInstanceKlass* to become ciKlass* and many more places would 833 // require checks to make sure the expected type was found. Given that this 834 // only occurs for clone() the more extensive fix seems like overkill so 835 // instead we simply smear the array type into Object. 836 if (method_holder->is_instance_klass()) { 837 return method_holder->as_instance_klass(); 838 } else if (method_holder->is_array_klass()) { 839 return current()->Object_klass(); 840 } else { 841 ShouldNotReachHere(); 842 } 843 return NULL; 844 } 845 846 847 // ------------------------------------------------------------------ 848 // ciEnv::get_method_by_index 849 ciMethod* ciEnv::get_method_by_index(constantPoolHandle cpool, 850 int index, Bytecodes::Code bc, 851 ciInstanceKlass* accessor) { 852 if (bc == Bytecodes::_invokedynamic) { 853 GUARDED_VM_ENTRY(return get_fake_invokedynamic_method_impl(cpool, index, bc);) 854 } else { 855 GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);) 856 } 857 } 858 859 860 // ------------------------------------------------------------------ 861 // ciEnv::name_buffer 862 char *ciEnv::name_buffer(int req_len) { 863 if (_name_buffer_len < req_len) { 864 if (_name_buffer == NULL) { 865 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len); 866 _name_buffer_len = req_len; 867 } else { 868 _name_buffer = 869 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len); 870 _name_buffer_len = req_len; 871 } 872 } 873 return _name_buffer; 874 } 875 876 // ------------------------------------------------------------------ 877 // ciEnv::is_in_vm 878 bool ciEnv::is_in_vm() { 879 return JavaThread::current()->thread_state() == _thread_in_vm; 880 } 881 882 bool ciEnv::system_dictionary_modification_counter_changed() { 883 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications(); 884 } 885 886 // ------------------------------------------------------------------ 887 // ciEnv::check_for_system_dictionary_modification 888 // Check for changes to the system dictionary during compilation 889 // class loads, evolution, breakpoints 890 void ciEnv::check_for_system_dictionary_modification(ciMethod* target) { 891 if (failing()) return; // no need for further checks 892 893 // Dependencies must be checked when the system dictionary changes. 894 // If logging is enabled all violated dependences will be recorded in 895 // the log. In debug mode check dependencies even if the system 896 // dictionary hasn't changed to verify that no invalid dependencies 897 // were inserted. Any violated dependences in this case are dumped to 898 // the tty. 899 900 bool counter_changed = system_dictionary_modification_counter_changed(); 901 bool test_deps = counter_changed; 902 DEBUG_ONLY(test_deps = true); 903 if (!test_deps) return; 904 905 bool print_failures = false; 906 DEBUG_ONLY(print_failures = !counter_changed); 907 908 bool keep_going = (print_failures || xtty != NULL); 909 910 int violated = 0; 911 912 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) { 913 klassOop witness = deps.check_dependency(); 914 if (witness != NULL) { 915 ++violated; 916 if (print_failures) deps.print_dependency(witness, /*verbose=*/ true); 917 // If there's no log and we're not sanity-checking, we're done. 918 if (!keep_going) break; 919 } 920 } 921 922 if (violated != 0) { 923 assert(counter_changed, "failed dependencies, but counter didn't change"); 924 record_failure("concurrent class loading"); 925 } 926 } 927 928 // ------------------------------------------------------------------ 929 // ciEnv::register_method 930 void ciEnv::register_method(ciMethod* target, 931 int entry_bci, 932 CodeOffsets* offsets, 933 int orig_pc_offset, 934 CodeBuffer* code_buffer, 935 int frame_words, 936 OopMapSet* oop_map_set, 937 ExceptionHandlerTable* handler_table, 938 ImplicitExceptionTable* inc_table, 939 AbstractCompiler* compiler, 940 int comp_level, 941 bool has_unsafe_access) { 942 VM_ENTRY_MARK; 943 nmethod* nm = NULL; 944 { 945 // To prevent compile queue updates. 946 MutexLocker locker(MethodCompileQueue_lock, THREAD); 947 948 // Prevent SystemDictionary::add_to_hierarchy from running 949 // and invalidating our dependencies until we install this method. 950 MutexLocker ml(Compile_lock); 951 952 // Change in Jvmti state may invalidate compilation. 953 if (!failing() && 954 ( (!jvmti_can_hotswap_or_post_breakpoint() && 955 JvmtiExport::can_hotswap_or_post_breakpoint()) || 956 (!jvmti_can_access_local_variables() && 957 JvmtiExport::can_access_local_variables()) || 958 (!jvmti_can_post_on_exceptions() && 959 JvmtiExport::can_post_on_exceptions()) )) { 960 record_failure("Jvmti state change invalidated dependencies"); 961 } 962 963 // Change in DTrace flags may invalidate compilation. 964 if (!failing() && 965 ( (!dtrace_extended_probes() && ExtendedDTraceProbes) || 966 (!dtrace_method_probes() && DTraceMethodProbes) || 967 (!dtrace_alloc_probes() && DTraceAllocProbes) )) { 968 record_failure("DTrace flags change invalidated dependencies"); 969 } 970 971 if (!failing()) { 972 if (log() != NULL) { 973 // Log the dependencies which this compilation declares. 974 dependencies()->log_all_dependencies(); 975 } 976 977 // Encode the dependencies now, so we can check them right away. 978 dependencies()->encode_content_bytes(); 979 980 // Check for {class loads, evolution, breakpoints} during compilation 981 check_for_system_dictionary_modification(target); 982 } 983 984 methodHandle method(THREAD, target->get_methodOop()); 985 986 if (failing()) { 987 // While not a true deoptimization, it is a preemptive decompile. 988 methodDataOop mdo = method()->method_data(); 989 if (mdo != NULL) { 990 mdo->inc_decompile_count(); 991 } 992 993 // All buffers in the CodeBuffer are allocated in the CodeCache. 994 // If the code buffer is created on each compile attempt 995 // as in C2, then it must be freed. 996 code_buffer->free_blob(); 997 return; 998 } 999 1000 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry"); 1001 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry"); 1002 1003 nm = nmethod::new_nmethod(method, 1004 compile_id(), 1005 entry_bci, 1006 offsets, 1007 orig_pc_offset, 1008 debug_info(), dependencies(), code_buffer, 1009 frame_words, oop_map_set, 1010 handler_table, inc_table, 1011 compiler, comp_level); 1012 1013 // Free codeBlobs 1014 code_buffer->free_blob(); 1015 1016 // stress test 6243940 by immediately making the method 1017 // non-entrant behind the system's back. This has serious 1018 // side effects on the code cache and is not meant for 1019 // general stress testing 1020 if (nm != NULL && StressNonEntrant) { 1021 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1022 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(), 1023 SharedRuntime::get_handle_wrong_method_stub()); 1024 } 1025 1026 if (nm == NULL) { 1027 // The CodeCache is full. Print out warning and disable compilation. 1028 record_failure("code cache is full"); 1029 { 1030 MutexUnlocker ml(Compile_lock); 1031 MutexUnlocker locker(MethodCompileQueue_lock); 1032 CompileBroker::handle_full_code_cache(); 1033 } 1034 } else { 1035 nm->set_has_unsafe_access(has_unsafe_access); 1036 1037 // Record successful registration. 1038 // (Put nm into the task handle *before* publishing to the Java heap.) 1039 if (task() != NULL) task()->set_code(nm); 1040 1041 if (entry_bci == InvocationEntryBci) { 1042 if (TieredCompilation) { 1043 // If there is an old version we're done with it 1044 nmethod* old = method->code(); 1045 if (TraceMethodReplacement && old != NULL) { 1046 ResourceMark rm; 1047 char *method_name = method->name_and_sig_as_C_string(); 1048 tty->print_cr("Replacing method %s", method_name); 1049 } 1050 if (old != NULL ) { 1051 old->make_not_entrant(); 1052 } 1053 } 1054 if (TraceNMethodInstalls ) { 1055 ResourceMark rm; 1056 char *method_name = method->name_and_sig_as_C_string(); 1057 ttyLocker ttyl; 1058 tty->print_cr("Installing method (%d) %s ", 1059 comp_level, 1060 method_name); 1061 } 1062 // Allow the code to be executed 1063 method->set_code(method, nm); 1064 } else { 1065 if (TraceNMethodInstalls ) { 1066 ResourceMark rm; 1067 char *method_name = method->name_and_sig_as_C_string(); 1068 ttyLocker ttyl; 1069 tty->print_cr("Installing osr method (%d) %s @ %d", 1070 comp_level, 1071 method_name, 1072 entry_bci); 1073 } 1074 instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm); 1075 1076 } 1077 } 1078 } 1079 // JVMTI -- compiled method notification (must be done outside lock) 1080 if (nm != NULL) { 1081 nm->post_compiled_method_load_event(); 1082 } 1083 1084 } 1085 1086 1087 // ------------------------------------------------------------------ 1088 // ciEnv::find_system_klass 1089 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) { 1090 VM_ENTRY_MARK; 1091 return get_klass_by_name_impl(NULL, constantPoolHandle(), klass_name, false); 1092 } 1093 1094 // ------------------------------------------------------------------ 1095 // ciEnv::comp_level 1096 int ciEnv::comp_level() { 1097 if (task() == NULL) return CompLevel_highest_tier; 1098 return task()->comp_level(); 1099 } 1100 1101 // ------------------------------------------------------------------ 1102 // ciEnv::compile_id 1103 uint ciEnv::compile_id() { 1104 if (task() == NULL) return 0; 1105 return task()->compile_id(); 1106 } 1107 1108 // ------------------------------------------------------------------ 1109 // ciEnv::notice_inlined_method() 1110 void ciEnv::notice_inlined_method(ciMethod* method) { 1111 _num_inlined_bytecodes += method->code_size(); 1112 } 1113 1114 // ------------------------------------------------------------------ 1115 // ciEnv::num_inlined_bytecodes() 1116 int ciEnv::num_inlined_bytecodes() const { 1117 return _num_inlined_bytecodes; 1118 } 1119 1120 // ------------------------------------------------------------------ 1121 // ciEnv::record_failure() 1122 void ciEnv::record_failure(const char* reason) { 1123 if (log() != NULL) { 1124 log()->elem("failure reason='%s'", reason); 1125 } 1126 if (_failure_reason == NULL) { 1127 // Record the first failure reason. 1128 _failure_reason = reason; 1129 } 1130 } 1131 1132 // ------------------------------------------------------------------ 1133 // ciEnv::record_method_not_compilable() 1134 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) { 1135 int new_compilable = 1136 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ; 1137 1138 // Only note transitions to a worse state 1139 if (new_compilable > _compilable) { 1140 if (log() != NULL) { 1141 if (all_tiers) { 1142 log()->elem("method_not_compilable"); 1143 } else { 1144 log()->elem("method_not_compilable_at_tier"); 1145 } 1146 } 1147 _compilable = new_compilable; 1148 1149 // Reset failure reason; this one is more important. 1150 _failure_reason = NULL; 1151 record_failure(reason); 1152 } 1153 } 1154 1155 // ------------------------------------------------------------------ 1156 // ciEnv::record_out_of_memory_failure() 1157 void ciEnv::record_out_of_memory_failure() { 1158 // If memory is low, we stop compiling methods. 1159 record_method_not_compilable("out of memory"); 1160 }