1 /* 2 * Copyright (c) 1999, 2010, 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 "runtime/init.hpp" 54 #include "runtime/reflection.hpp" 55 #include "runtime/sharedRuntime.hpp" 56 #include "utilities/dtrace.hpp" 57 #ifdef COMPILER1 58 #include "c1/c1_Runtime1.hpp" 59 #endif 60 #ifdef COMPILER2 61 #include "opto/runtime.hpp" 62 #endif 63 64 // ciEnv 65 // 66 // This class is the top level broker for requests from the compiler 67 // to the VM. 68 69 ciObject* ciEnv::_null_object_instance; 70 ciMethodKlass* ciEnv::_method_klass_instance; 71 ciSymbolKlass* ciEnv::_symbol_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 current_thread->set_env(NULL); 206 } 207 208 // ------------------------------------------------------------------ 209 // Cache Jvmti state 210 void ciEnv::cache_jvmti_state() { 211 VM_ENTRY_MARK; 212 // Get Jvmti capabilities under lock to get consistant values. 213 MutexLocker mu(JvmtiThreadState_lock); 214 _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint(); 215 _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables(); 216 _jvmti_can_post_on_exceptions = JvmtiExport::can_post_on_exceptions(); 217 } 218 219 // ------------------------------------------------------------------ 220 // Cache DTrace flags 221 void ciEnv::cache_dtrace_flags() { 222 // Need lock? 223 _dtrace_extended_probes = ExtendedDTraceProbes; 224 if (_dtrace_extended_probes) { 225 _dtrace_monitor_probes = true; 226 _dtrace_method_probes = true; 227 _dtrace_alloc_probes = true; 228 } else { 229 _dtrace_monitor_probes = DTraceMonitorProbes; 230 _dtrace_method_probes = DTraceMethodProbes; 231 _dtrace_alloc_probes = DTraceAllocProbes; 232 } 233 } 234 235 // ------------------------------------------------------------------ 236 // helper for lazy exception creation 237 ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) { 238 VM_ENTRY_MARK; 239 if (handle == NULL) { 240 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance. 241 klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD); 242 jobject objh = NULL; 243 if (!HAS_PENDING_EXCEPTION && k != NULL) { 244 oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD); 245 if (!HAS_PENDING_EXCEPTION) 246 objh = JNIHandles::make_global(obj); 247 } 248 if (HAS_PENDING_EXCEPTION) { 249 CLEAR_PENDING_EXCEPTION; 250 } else { 251 handle = objh; 252 } 253 } 254 oop obj = JNIHandles::resolve(handle); 255 return obj == NULL? NULL: get_object(obj)->as_instance(); 256 } 257 258 // ------------------------------------------------------------------ 259 // ciEnv::ArrayIndexOutOfBoundsException_instance, etc. 260 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() { 261 if (_ArrayIndexOutOfBoundsException_instance == NULL) { 262 _ArrayIndexOutOfBoundsException_instance 263 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle, 264 vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException()); 265 } 266 return _ArrayIndexOutOfBoundsException_instance; 267 } 268 ciInstance* ciEnv::ArrayStoreException_instance() { 269 if (_ArrayStoreException_instance == NULL) { 270 _ArrayStoreException_instance 271 = get_or_create_exception(_ArrayStoreException_handle, 272 vmSymbolHandles::java_lang_ArrayStoreException()); 273 } 274 return _ArrayStoreException_instance; 275 } 276 ciInstance* ciEnv::ClassCastException_instance() { 277 if (_ClassCastException_instance == NULL) { 278 _ClassCastException_instance 279 = get_or_create_exception(_ClassCastException_handle, 280 vmSymbolHandles::java_lang_ClassCastException()); 281 } 282 return _ClassCastException_instance; 283 } 284 285 ciInstance* ciEnv::the_null_string() { 286 if (_the_null_string == NULL) { 287 VM_ENTRY_MARK; 288 _the_null_string = get_object(Universe::the_null_string())->as_instance(); 289 } 290 return _the_null_string; 291 } 292 293 ciInstance* ciEnv::the_min_jint_string() { 294 if (_the_min_jint_string == NULL) { 295 VM_ENTRY_MARK; 296 _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance(); 297 } 298 return _the_min_jint_string; 299 } 300 301 // ------------------------------------------------------------------ 302 // ciEnv::get_method_from_handle 303 ciMethod* ciEnv::get_method_from_handle(jobject method) { 304 VM_ENTRY_MARK; 305 return get_object(JNIHandles::resolve(method))->as_method(); 306 } 307 308 // ------------------------------------------------------------------ 309 // ciEnv::make_array 310 ciArray* ciEnv::make_system_array(GrowableArray<ciObject*>* objects) { 311 VM_ENTRY_MARK; 312 int length = objects->length(); 313 objArrayOop a = oopFactory::new_system_objArray(length, THREAD); 314 if (HAS_PENDING_EXCEPTION) { 315 CLEAR_PENDING_EXCEPTION; 316 record_out_of_memory_failure(); 317 return NULL; 318 } 319 for (int i = 0; i < length; i++) { 320 a->obj_at_put(i, objects->at(i)->get_oop()); 321 } 322 assert(a->is_perm(), ""); 323 return get_object(a)->as_array(); 324 } 325 326 327 // ------------------------------------------------------------------ 328 // ciEnv::array_element_offset_in_bytes 329 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) { 330 VM_ENTRY_MARK; 331 objArrayOop a = (objArrayOop)a_h->get_oop(); 332 assert(a->is_objArray(), ""); 333 int length = a->length(); 334 oop o = o_h->get_oop(); 335 for (int i = 0; i < length; i++) { 336 if (a->obj_at(i) == o) return i; 337 } 338 return -1; 339 } 340 341 342 // ------------------------------------------------------------------ 343 // ciEnv::check_klass_accessiblity 344 // 345 // Note: the logic of this method should mirror the logic of 346 // constantPoolOopDesc::verify_constant_pool_resolve. 347 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass, 348 klassOop resolved_klass) { 349 if (accessing_klass == NULL || !accessing_klass->is_loaded()) { 350 return true; 351 } 352 if (accessing_klass->is_obj_array()) { 353 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass(); 354 } 355 if (!accessing_klass->is_instance_klass()) { 356 return true; 357 } 358 359 if (resolved_klass->klass_part()->oop_is_objArray()) { 360 // Find the element klass, if this is an array. 361 resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass(); 362 } 363 if (resolved_klass->klass_part()->oop_is_instance()) { 364 return Reflection::verify_class_access(accessing_klass->get_klassOop(), 365 resolved_klass, 366 true); 367 } 368 return true; 369 } 370 371 // ------------------------------------------------------------------ 372 // ciEnv::get_klass_by_name_impl 373 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass, 374 ciSymbol* name, 375 bool require_local) { 376 ASSERT_IN_VM; 377 EXCEPTION_CONTEXT; 378 379 // Now we need to check the SystemDictionary 380 symbolHandle sym(THREAD, name->get_symbolOop()); 381 if (sym->byte_at(0) == 'L' && 382 sym->byte_at(sym->utf8_length()-1) == ';') { 383 // This is a name from a signature. Strip off the trimmings. 384 sym = oopFactory::new_symbol_handle(sym->as_utf8()+1, 385 sym->utf8_length()-2, 386 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass)); 387 name = get_object(sym())->as_symbol(); 388 } 389 390 // Check for prior unloaded klass. The SystemDictionary's answers 391 // can vary over time but the compiler needs consistency. 392 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name); 393 if (unloaded_klass != NULL) { 394 if (require_local) return NULL; 395 return unloaded_klass; 396 } 397 398 Handle loader(THREAD, (oop)NULL); 399 Handle domain(THREAD, (oop)NULL); 400 if (accessing_klass != NULL) { 401 loader = Handle(THREAD, accessing_klass->loader()); 402 domain = Handle(THREAD, accessing_klass->protection_domain()); 403 } 404 405 // setup up the proper type to return on OOM 406 ciKlass* fail_type; 407 if (sym->byte_at(0) == '[') { 408 fail_type = _unloaded_ciobjarrayklass; 409 } else { 410 fail_type = _unloaded_ciinstance_klass; 411 } 412 klassOop found_klass; 413 if (!require_local) { 414 found_klass = 415 SystemDictionary::find_constrained_instance_or_array_klass(sym, loader, 416 KILL_COMPILE_ON_FATAL_(fail_type)); 417 } else { 418 found_klass = 419 SystemDictionary::find_instance_or_array_klass(sym, loader, domain, 420 KILL_COMPILE_ON_FATAL_(fail_type)); 421 } 422 423 // If we fail to find an array klass, look again for its element type. 424 // The element type may be available either locally or via constraints. 425 // In either case, if we can find the element type in the system dictionary, 426 // we must build an array type around it. The CI requires array klasses 427 // to be loaded if their element klasses are loaded, except when memory 428 // is exhausted. 429 if (sym->byte_at(0) == '[' && 430 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) { 431 // We have an unloaded array. 432 // Build it on the fly if the element class exists. 433 symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1, 434 sym->utf8_length()-1, 435 KILL_COMPILE_ON_FATAL_(fail_type)); 436 // Get element ciKlass recursively. 437 ciKlass* elem_klass = 438 get_klass_by_name_impl(accessing_klass, 439 get_object(elem_sym)->as_symbol(), 440 require_local); 441 if (elem_klass != NULL && elem_klass->is_loaded()) { 442 // Now make an array for it 443 return ciObjArrayKlass::make_impl(elem_klass); 444 } 445 } 446 447 if (found_klass != NULL) { 448 // Found it. Build a CI handle. 449 return get_object(found_klass)->as_klass(); 450 } 451 452 if (require_local) return NULL; 453 // Not yet loaded into the VM, or not governed by loader constraints. 454 // Make a CI representative for it. 455 return get_unloaded_klass(accessing_klass, name); 456 } 457 458 // ------------------------------------------------------------------ 459 // ciEnv::get_klass_by_name 460 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass, 461 ciSymbol* klass_name, 462 bool require_local) { 463 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass, 464 klass_name, 465 require_local);) 466 } 467 468 // ------------------------------------------------------------------ 469 // ciEnv::get_klass_by_index_impl 470 // 471 // Implementation of get_klass_by_index. 472 ciKlass* ciEnv::get_klass_by_index_impl(constantPoolHandle cpool, 473 int index, 474 bool& is_accessible, 475 ciInstanceKlass* accessor) { 476 EXCEPTION_CONTEXT; 477 KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index)); 478 symbolHandle klass_name; 479 if (klass.is_null()) { 480 // The klass has not been inserted into the constant pool. 481 // Try to look it up by name. 482 { 483 // We have to lock the cpool to keep the oop from being resolved 484 // while we are accessing it. 485 ObjectLocker ol(cpool, THREAD); 486 487 constantTag tag = cpool->tag_at(index); 488 if (tag.is_klass()) { 489 // The klass has been inserted into the constant pool 490 // very recently. 491 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index)); 492 } else if (tag.is_symbol()) { 493 klass_name = symbolHandle(THREAD, cpool->symbol_at(index)); 494 } else { 495 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag"); 496 klass_name = symbolHandle(THREAD, cpool->unresolved_klass_at(index)); 497 } 498 } 499 } 500 501 if (klass.is_null()) { 502 // Not found in constant pool. Use the name to do the lookup. 503 ciKlass* k = get_klass_by_name_impl(accessor, 504 get_object(klass_name())->as_symbol(), 505 false); 506 // Calculate accessibility the hard way. 507 if (!k->is_loaded()) { 508 is_accessible = false; 509 } else if (k->loader() != accessor->loader() && 510 get_klass_by_name_impl(accessor, k->name(), true) == NULL) { 511 // Loaded only remotely. Not linked yet. 512 is_accessible = false; 513 } else { 514 // Linked locally, and we must also check public/private, etc. 515 is_accessible = check_klass_accessibility(accessor, k->get_klassOop()); 516 } 517 return k; 518 } 519 520 // Check for prior unloaded klass. The SystemDictionary's answers 521 // can vary over time but the compiler needs consistency. 522 ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol(); 523 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name); 524 if (unloaded_klass != NULL) { 525 is_accessible = false; 526 return unloaded_klass; 527 } 528 529 // It is known to be accessible, since it was found in the constant pool. 530 is_accessible = true; 531 return get_object(klass())->as_klass(); 532 } 533 534 // ------------------------------------------------------------------ 535 // ciEnv::get_klass_by_index 536 // 537 // Get a klass from the constant pool. 538 ciKlass* ciEnv::get_klass_by_index(constantPoolHandle cpool, 539 int index, 540 bool& is_accessible, 541 ciInstanceKlass* accessor) { 542 GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);) 543 } 544 545 // ------------------------------------------------------------------ 546 // ciEnv::get_constant_by_index_impl 547 // 548 // Implementation of get_constant_by_index(). 549 ciConstant ciEnv::get_constant_by_index_impl(constantPoolHandle cpool, 550 int pool_index, int cache_index, 551 ciInstanceKlass* accessor) { 552 bool ignore_will_link; 553 EXCEPTION_CONTEXT; 554 int index = pool_index; 555 if (cache_index >= 0) { 556 assert(index < 0, "only one kind of index at a time"); 557 ConstantPoolCacheEntry* cpc_entry = cpool->cache()->entry_at(cache_index); 558 index = cpc_entry->constant_pool_index(); 559 oop obj = cpc_entry->f1(); 560 if (obj != NULL) { 561 assert(obj->is_instance(), "must be an instance"); 562 ciObject* ciobj = get_object(obj); 563 return ciConstant(T_OBJECT, ciobj); 564 } 565 } 566 constantTag tag = cpool->tag_at(index); 567 if (tag.is_int()) { 568 return ciConstant(T_INT, (jint)cpool->int_at(index)); 569 } else if (tag.is_long()) { 570 return ciConstant((jlong)cpool->long_at(index)); 571 } else if (tag.is_float()) { 572 return ciConstant((jfloat)cpool->float_at(index)); 573 } else if (tag.is_double()) { 574 return ciConstant((jdouble)cpool->double_at(index)); 575 } else if (tag.is_string() || tag.is_unresolved_string()) { 576 oop string = NULL; 577 if (cpool->is_pseudo_string_at(index)) { 578 string = cpool->pseudo_string_at(index); 579 } else { 580 string = cpool->string_at(index, THREAD); 581 if (HAS_PENDING_EXCEPTION) { 582 CLEAR_PENDING_EXCEPTION; 583 record_out_of_memory_failure(); 584 return ciConstant(); 585 } 586 } 587 ciObject* constant = get_object(string); 588 assert (constant->is_instance(), "must be an instance, or not? "); 589 return ciConstant(T_OBJECT, constant); 590 } else if (tag.is_klass() || tag.is_unresolved_klass()) { 591 // 4881222: allow ldc to take a class type 592 ciKlass* klass = get_klass_by_index_impl(cpool, index, ignore_will_link, accessor); 593 if (HAS_PENDING_EXCEPTION) { 594 CLEAR_PENDING_EXCEPTION; 595 record_out_of_memory_failure(); 596 return ciConstant(); 597 } 598 assert (klass->is_instance_klass() || klass->is_array_klass(), 599 "must be an instance or array klass "); 600 return ciConstant(T_OBJECT, klass->java_mirror()); 601 } else if (tag.is_object()) { 602 oop obj = cpool->object_at(index); 603 assert(obj->is_instance(), "must be an instance"); 604 ciObject* ciobj = get_object(obj); 605 return ciConstant(T_OBJECT, ciobj); 606 } else if (tag.is_method_type()) { 607 // must execute Java code to link this CP entry into cache[i].f1 608 ciSymbol* signature = get_object(cpool->method_type_signature_at(index))->as_symbol(); 609 ciObject* ciobj = get_unloaded_method_type_constant(signature); 610 return ciConstant(T_OBJECT, ciobj); 611 } else if (tag.is_method_handle()) { 612 // must execute Java code to link this CP entry into cache[i].f1 613 int ref_kind = cpool->method_handle_ref_kind_at(index); 614 int callee_index = cpool->method_handle_klass_index_at(index); 615 ciKlass* callee = get_klass_by_index_impl(cpool, callee_index, ignore_will_link, accessor); 616 ciSymbol* name = get_object(cpool->method_handle_name_ref_at(index))->as_symbol(); 617 ciSymbol* signature = get_object(cpool->method_handle_signature_ref_at(index))->as_symbol(); 618 ciObject* ciobj = get_unloaded_method_handle_constant(callee, name, signature, ref_kind); 619 return ciConstant(T_OBJECT, ciobj); 620 } else { 621 ShouldNotReachHere(); 622 return ciConstant(); 623 } 624 } 625 626 // ------------------------------------------------------------------ 627 // ciEnv::get_constant_by_index 628 // 629 // Pull a constant out of the constant pool. How appropriate. 630 // 631 // Implementation note: this query is currently in no way cached. 632 ciConstant ciEnv::get_constant_by_index(constantPoolHandle cpool, 633 int pool_index, int cache_index, 634 ciInstanceKlass* accessor) { 635 GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, pool_index, cache_index, accessor);) 636 } 637 638 // ------------------------------------------------------------------ 639 // ciEnv::get_field_by_index_impl 640 // 641 // Implementation of get_field_by_index. 642 // 643 // Implementation note: the results of field lookups are cached 644 // in the accessor klass. 645 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor, 646 int index) { 647 ciConstantPoolCache* cache = accessor->field_cache(); 648 if (cache == NULL) { 649 ciField* field = new (arena()) ciField(accessor, index); 650 return field; 651 } else { 652 ciField* field = (ciField*)cache->get(index); 653 if (field == NULL) { 654 field = new (arena()) ciField(accessor, index); 655 cache->insert(index, field); 656 } 657 return field; 658 } 659 } 660 661 // ------------------------------------------------------------------ 662 // ciEnv::get_field_by_index 663 // 664 // Get a field by index from a klass's constant pool. 665 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor, 666 int index) { 667 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);) 668 } 669 670 // ------------------------------------------------------------------ 671 // ciEnv::lookup_method 672 // 673 // Perform an appropriate method lookup based on accessor, holder, 674 // name, signature, and bytecode. 675 methodOop ciEnv::lookup_method(instanceKlass* accessor, 676 instanceKlass* holder, 677 symbolOop name, 678 symbolOop sig, 679 Bytecodes::Code bc) { 680 EXCEPTION_CONTEXT; 681 KlassHandle h_accessor(THREAD, accessor); 682 KlassHandle h_holder(THREAD, holder); 683 symbolHandle h_name(THREAD, name); 684 symbolHandle h_sig(THREAD, sig); 685 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL)); 686 methodHandle dest_method; 687 switch (bc) { 688 case Bytecodes::_invokestatic: 689 dest_method = 690 LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor); 691 break; 692 case Bytecodes::_invokespecial: 693 dest_method = 694 LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor); 695 break; 696 case Bytecodes::_invokeinterface: 697 dest_method = 698 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig, 699 h_accessor, true); 700 break; 701 case Bytecodes::_invokevirtual: 702 dest_method = 703 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig, 704 h_accessor, true); 705 break; 706 default: ShouldNotReachHere(); 707 } 708 709 return dest_method(); 710 } 711 712 713 // ------------------------------------------------------------------ 714 // ciEnv::get_method_by_index_impl 715 ciMethod* ciEnv::get_method_by_index_impl(constantPoolHandle cpool, 716 int index, Bytecodes::Code bc, 717 ciInstanceKlass* accessor) { 718 int holder_index = cpool->klass_ref_index_at(index); 719 bool holder_is_accessible; 720 ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor); 721 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder); 722 723 // Get the method's name and signature. 724 symbolOop name_sym = cpool->name_ref_at(index); 725 symbolOop sig_sym = cpool->signature_ref_at(index); 726 727 if (holder_is_accessible) { // Our declared holder is loaded. 728 instanceKlass* lookup = declared_holder->get_instanceKlass(); 729 methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc); 730 if (m != NULL) { 731 // We found the method. 732 return get_object(m)->as_method(); 733 } 734 } 735 736 // Either the declared holder was not loaded, or the method could 737 // not be found. Create a dummy ciMethod to represent the failed 738 // lookup. 739 740 return get_unloaded_method(declared_holder, 741 get_object(name_sym)->as_symbol(), 742 get_object(sig_sym)->as_symbol()); 743 } 744 745 746 // ------------------------------------------------------------------ 747 // ciEnv::get_fake_invokedynamic_method_impl 748 ciMethod* ciEnv::get_fake_invokedynamic_method_impl(constantPoolHandle cpool, 749 int index, Bytecodes::Code bc) { 750 // Compare the following logic with InterpreterRuntime::resolve_invokedynamic. 751 assert(bc == Bytecodes::_invokedynamic, "must be invokedynamic"); 752 753 bool is_resolved = cpool->cache()->main_entry_at(index)->is_resolved(bc); 754 if (is_resolved && (oop) cpool->cache()->secondary_entry_at(index)->f1() == NULL) 755 // FIXME: code generation could allow for null (unlinked) call site 756 is_resolved = false; 757 758 // Call site might not be resolved yet. We could create a real invoker method from the 759 // compiler, but it is simpler to stop the code path here with an unlinked method. 760 if (!is_resolved) { 761 ciInstanceKlass* mh_klass = get_object(SystemDictionary::MethodHandle_klass())->as_instance_klass(); 762 ciSymbol* sig_sym = get_object(cpool->signature_ref_at(index))->as_symbol(); 763 return get_unloaded_method(mh_klass, ciSymbol::invokeExact_name(), sig_sym); 764 } 765 766 // Get the invoker methodOop from the constant pool. 767 oop f1_value = cpool->cache()->main_entry_at(index)->f1(); 768 methodOop signature_invoker = methodOop(f1_value); 769 assert(signature_invoker != NULL && signature_invoker->is_method() && signature_invoker->is_method_handle_invoke(), 770 "correct result from LinkResolver::resolve_invokedynamic"); 771 772 return get_object(signature_invoker)->as_method(); 773 } 774 775 776 // ------------------------------------------------------------------ 777 // ciEnv::get_instance_klass_for_declared_method_holder 778 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) { 779 // For the case of <array>.clone(), the method holder can be a ciArrayKlass 780 // instead of a ciInstanceKlass. For that case simply pretend that the 781 // declared holder is Object.clone since that's where the call will bottom out. 782 // A more correct fix would trickle out through many interfaces in CI, 783 // requiring ciInstanceKlass* to become ciKlass* and many more places would 784 // require checks to make sure the expected type was found. Given that this 785 // only occurs for clone() the more extensive fix seems like overkill so 786 // instead we simply smear the array type into Object. 787 if (method_holder->is_instance_klass()) { 788 return method_holder->as_instance_klass(); 789 } else if (method_holder->is_array_klass()) { 790 return current()->Object_klass(); 791 } else { 792 ShouldNotReachHere(); 793 } 794 return NULL; 795 } 796 797 798 // ------------------------------------------------------------------ 799 // ciEnv::get_method_by_index 800 ciMethod* ciEnv::get_method_by_index(constantPoolHandle cpool, 801 int index, Bytecodes::Code bc, 802 ciInstanceKlass* accessor) { 803 if (bc == Bytecodes::_invokedynamic) { 804 GUARDED_VM_ENTRY(return get_fake_invokedynamic_method_impl(cpool, index, bc);) 805 } else { 806 GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);) 807 } 808 } 809 810 811 // ------------------------------------------------------------------ 812 // ciEnv::name_buffer 813 char *ciEnv::name_buffer(int req_len) { 814 if (_name_buffer_len < req_len) { 815 if (_name_buffer == NULL) { 816 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len); 817 _name_buffer_len = req_len; 818 } else { 819 _name_buffer = 820 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len); 821 _name_buffer_len = req_len; 822 } 823 } 824 return _name_buffer; 825 } 826 827 // ------------------------------------------------------------------ 828 // ciEnv::is_in_vm 829 bool ciEnv::is_in_vm() { 830 return JavaThread::current()->thread_state() == _thread_in_vm; 831 } 832 833 bool ciEnv::system_dictionary_modification_counter_changed() { 834 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications(); 835 } 836 837 // ------------------------------------------------------------------ 838 // ciEnv::check_for_system_dictionary_modification 839 // Check for changes to the system dictionary during compilation 840 // class loads, evolution, breakpoints 841 void ciEnv::check_for_system_dictionary_modification(ciMethod* target) { 842 if (failing()) return; // no need for further checks 843 844 // Dependencies must be checked when the system dictionary changes. 845 // If logging is enabled all violated dependences will be recorded in 846 // the log. In debug mode check dependencies even if the system 847 // dictionary hasn't changed to verify that no invalid dependencies 848 // were inserted. Any violated dependences in this case are dumped to 849 // the tty. 850 851 bool counter_changed = system_dictionary_modification_counter_changed(); 852 bool test_deps = counter_changed; 853 DEBUG_ONLY(test_deps = true); 854 if (!test_deps) return; 855 856 bool print_failures = false; 857 DEBUG_ONLY(print_failures = !counter_changed); 858 859 bool keep_going = (print_failures || xtty != NULL); 860 861 int violated = 0; 862 863 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) { 864 klassOop witness = deps.check_dependency(); 865 if (witness != NULL) { 866 ++violated; 867 if (print_failures) deps.print_dependency(witness, /*verbose=*/ true); 868 // If there's no log and we're not sanity-checking, we're done. 869 if (!keep_going) break; 870 } 871 } 872 873 if (violated != 0) { 874 assert(counter_changed, "failed dependencies, but counter didn't change"); 875 record_failure("concurrent class loading"); 876 } 877 } 878 879 // ------------------------------------------------------------------ 880 // ciEnv::register_method 881 void ciEnv::register_method(ciMethod* target, 882 int entry_bci, 883 CodeOffsets* offsets, 884 int orig_pc_offset, 885 CodeBuffer* code_buffer, 886 int frame_words, 887 OopMapSet* oop_map_set, 888 ExceptionHandlerTable* handler_table, 889 ImplicitExceptionTable* inc_table, 890 AbstractCompiler* compiler, 891 int comp_level, 892 bool has_debug_info, 893 bool has_unsafe_access) { 894 VM_ENTRY_MARK; 895 nmethod* nm = NULL; 896 { 897 // To prevent compile queue updates. 898 MutexLocker locker(MethodCompileQueue_lock, THREAD); 899 900 // Prevent SystemDictionary::add_to_hierarchy from running 901 // and invalidating our dependencies until we install this method. 902 MutexLocker ml(Compile_lock); 903 904 // Change in Jvmti state may invalidate compilation. 905 if (!failing() && 906 ( (!jvmti_can_hotswap_or_post_breakpoint() && 907 JvmtiExport::can_hotswap_or_post_breakpoint()) || 908 (!jvmti_can_access_local_variables() && 909 JvmtiExport::can_access_local_variables()) || 910 (!jvmti_can_post_on_exceptions() && 911 JvmtiExport::can_post_on_exceptions()) )) { 912 record_failure("Jvmti state change invalidated dependencies"); 913 } 914 915 // Change in DTrace flags may invalidate compilation. 916 if (!failing() && 917 ( (!dtrace_extended_probes() && ExtendedDTraceProbes) || 918 (!dtrace_method_probes() && DTraceMethodProbes) || 919 (!dtrace_alloc_probes() && DTraceAllocProbes) )) { 920 record_failure("DTrace flags change invalidated dependencies"); 921 } 922 923 if (!failing()) { 924 if (log() != NULL) { 925 // Log the dependencies which this compilation declares. 926 dependencies()->log_all_dependencies(); 927 } 928 929 // Encode the dependencies now, so we can check them right away. 930 dependencies()->encode_content_bytes(); 931 932 // Check for {class loads, evolution, breakpoints} during compilation 933 check_for_system_dictionary_modification(target); 934 } 935 936 methodHandle method(THREAD, target->get_methodOop()); 937 938 if (failing()) { 939 // While not a true deoptimization, it is a preemptive decompile. 940 methodDataOop mdo = method()->method_data(); 941 if (mdo != NULL) { 942 mdo->inc_decompile_count(); 943 } 944 945 // All buffers in the CodeBuffer are allocated in the CodeCache. 946 // If the code buffer is created on each compile attempt 947 // as in C2, then it must be freed. 948 code_buffer->free_blob(); 949 return; 950 } 951 952 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry"); 953 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry"); 954 955 nm = nmethod::new_nmethod(method, 956 compile_id(), 957 entry_bci, 958 offsets, 959 orig_pc_offset, 960 debug_info(), dependencies(), code_buffer, 961 frame_words, oop_map_set, 962 handler_table, inc_table, 963 compiler, comp_level); 964 965 // Free codeBlobs 966 code_buffer->free_blob(); 967 968 // stress test 6243940 by immediately making the method 969 // non-entrant behind the system's back. This has serious 970 // side effects on the code cache and is not meant for 971 // general stress testing 972 if (nm != NULL && StressNonEntrant) { 973 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 974 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(), 975 SharedRuntime::get_handle_wrong_method_stub()); 976 } 977 978 if (nm == NULL) { 979 // The CodeCache is full. Print out warning and disable compilation. 980 record_failure("code cache is full"); 981 { 982 MutexUnlocker ml(Compile_lock); 983 MutexUnlocker locker(MethodCompileQueue_lock); 984 CompileBroker::handle_full_code_cache(); 985 } 986 } else { 987 NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); ) 988 nm->set_has_unsafe_access(has_unsafe_access); 989 990 // Record successful registration. 991 // (Put nm into the task handle *before* publishing to the Java heap.) 992 if (task() != NULL) task()->set_code(nm); 993 994 if (entry_bci == InvocationEntryBci) { 995 if (TieredCompilation) { 996 // If there is an old version we're done with it 997 nmethod* old = method->code(); 998 if (TraceMethodReplacement && old != NULL) { 999 ResourceMark rm; 1000 char *method_name = method->name_and_sig_as_C_string(); 1001 tty->print_cr("Replacing method %s", method_name); 1002 } 1003 if (old != NULL ) { 1004 old->make_not_entrant(); 1005 } 1006 } 1007 if (TraceNMethodInstalls ) { 1008 ResourceMark rm; 1009 char *method_name = method->name_and_sig_as_C_string(); 1010 ttyLocker ttyl; 1011 tty->print_cr("Installing method (%d) %s ", 1012 comp_level, 1013 method_name); 1014 } 1015 // Allow the code to be executed 1016 method->set_code(method, nm); 1017 } else { 1018 if (TraceNMethodInstalls ) { 1019 ResourceMark rm; 1020 char *method_name = method->name_and_sig_as_C_string(); 1021 ttyLocker ttyl; 1022 tty->print_cr("Installing osr method (%d) %s @ %d", 1023 comp_level, 1024 method_name, 1025 entry_bci); 1026 } 1027 instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm); 1028 1029 } 1030 } 1031 } 1032 // JVMTI -- compiled method notification (must be done outside lock) 1033 if (nm != NULL) { 1034 nm->post_compiled_method_load_event(); 1035 } 1036 1037 } 1038 1039 1040 // ------------------------------------------------------------------ 1041 // ciEnv::find_system_klass 1042 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) { 1043 VM_ENTRY_MARK; 1044 return get_klass_by_name_impl(NULL, klass_name, false); 1045 } 1046 1047 // ------------------------------------------------------------------ 1048 // ciEnv::comp_level 1049 int ciEnv::comp_level() { 1050 if (task() == NULL) return CompLevel_highest_tier; 1051 return task()->comp_level(); 1052 } 1053 1054 // ------------------------------------------------------------------ 1055 // ciEnv::compile_id 1056 uint ciEnv::compile_id() { 1057 if (task() == NULL) return 0; 1058 return task()->compile_id(); 1059 } 1060 1061 // ------------------------------------------------------------------ 1062 // ciEnv::notice_inlined_method() 1063 void ciEnv::notice_inlined_method(ciMethod* method) { 1064 _num_inlined_bytecodes += method->code_size(); 1065 } 1066 1067 // ------------------------------------------------------------------ 1068 // ciEnv::num_inlined_bytecodes() 1069 int ciEnv::num_inlined_bytecodes() const { 1070 return _num_inlined_bytecodes; 1071 } 1072 1073 // ------------------------------------------------------------------ 1074 // ciEnv::record_failure() 1075 void ciEnv::record_failure(const char* reason) { 1076 if (log() != NULL) { 1077 log()->elem("failure reason='%s'", reason); 1078 } 1079 if (_failure_reason == NULL) { 1080 // Record the first failure reason. 1081 _failure_reason = reason; 1082 } 1083 } 1084 1085 // ------------------------------------------------------------------ 1086 // ciEnv::record_method_not_compilable() 1087 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) { 1088 int new_compilable = 1089 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ; 1090 1091 // Only note transitions to a worse state 1092 if (new_compilable > _compilable) { 1093 if (log() != NULL) { 1094 if (all_tiers) { 1095 log()->elem("method_not_compilable"); 1096 } else { 1097 log()->elem("method_not_compilable_at_tier"); 1098 } 1099 } 1100 _compilable = new_compilable; 1101 1102 // Reset failure reason; this one is more important. 1103 _failure_reason = NULL; 1104 record_failure(reason); 1105 } 1106 } 1107 1108 // ------------------------------------------------------------------ 1109 // ciEnv::record_out_of_memory_failure() 1110 void ciEnv::record_out_of_memory_failure() { 1111 // If memory is low, we stop compiling methods. 1112 record_method_not_compilable("out of memory"); 1113 }