1 /* 2 * Copyright (c) 1999, 2013, 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/ciMethod.hpp" 32 #include "ci/ciNullObject.hpp" 33 #include "ci/ciReplay.hpp" 34 #include "ci/ciUtilities.hpp" 35 #include "classfile/systemDictionary.hpp" 36 #include "classfile/vmSymbols.hpp" 37 #include "code/scopeDesc.hpp" 38 #include "compiler/compileBroker.hpp" 39 #include "compiler/compileLog.hpp" 40 #include "compiler/compilerOracle.hpp" 41 #include "gc_interface/collectedHeap.inline.hpp" 42 #include "interpreter/linkResolver.hpp" 43 #include "memory/allocation.inline.hpp" 44 #include "memory/oopFactory.hpp" 45 #include "memory/universe.inline.hpp" 46 #include "oops/methodData.hpp" 47 #include "oops/objArrayKlass.hpp" 48 #include "oops/oop.inline.hpp" 49 #include "oops/oop.inline2.hpp" 50 #include "prims/jvmtiExport.hpp" 51 #include "runtime/init.hpp" 52 #include "runtime/reflection.hpp" 53 #include "runtime/sharedRuntime.hpp" 54 #include "utilities/dtrace.hpp" 55 #include "utilities/macros.hpp" 56 #ifdef COMPILER1 57 #include "c1/c1_Runtime1.hpp" 58 #endif 59 #ifdef COMPILER2 60 #include "opto/runtime.hpp" 61 #endif 62 63 // ciEnv 64 // 65 // This class is the top level broker for requests from the compiler 66 // to the VM. 67 68 ciObject* ciEnv::_null_object_instance; 69 70 #define WK_KLASS_DEFN(name, ignore_s, ignore_o) ciInstanceKlass* ciEnv::_##name = NULL; 71 WK_KLASSES_DO(WK_KLASS_DEFN) 72 #undef WK_KLASS_DEFN 73 74 ciSymbol* ciEnv::_unloaded_cisymbol = NULL; 75 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL; 76 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL; 77 78 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL; 79 jobject ciEnv::_ArrayStoreException_handle = NULL; 80 jobject ciEnv::_ClassCastException_handle = NULL; 81 82 #ifndef PRODUCT 83 static bool firstEnv = true; 84 #endif /* PRODUCT */ 85 86 // ------------------------------------------------------------------ 87 // ciEnv::ciEnv 88 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) { 89 VM_ENTRY_MARK; 90 91 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc. 92 thread->set_env(this); 93 assert(ciEnv::current() == this, "sanity"); 94 95 _oop_recorder = NULL; 96 _debug_info = NULL; 97 _dependencies = NULL; 98 _failure_reason = NULL; 99 _compilable = MethodCompilable; 100 _break_at_compile = false; 101 _compiler_data = NULL; 102 #ifndef PRODUCT 103 assert(!firstEnv, "not initialized properly"); 104 #endif /* !PRODUCT */ 105 106 _system_dictionary_modification_counter = system_dictionary_modification_counter; 107 _num_inlined_bytecodes = 0; 108 assert(task == NULL || thread->task() == task, "sanity"); 109 _task = task; 110 _log = NULL; 111 112 // Temporary buffer for creating symbols and such. 113 _name_buffer = NULL; 114 _name_buffer_len = 0; 115 116 _arena = &_ciEnv_arena; 117 _factory = new (_arena) ciObjectFactory(_arena, 128); 118 119 // Preload commonly referenced system ciObjects. 120 121 // During VM initialization, these instances have not yet been created. 122 // Assertions ensure that these instances are not accessed before 123 // their initialization. 124 125 assert(Universe::is_fully_initialized(), "should be complete"); 126 127 oop o = Universe::null_ptr_exception_instance(); 128 assert(o != NULL, "should have been initialized"); 129 _NullPointerException_instance = get_object(o)->as_instance(); 130 o = Universe::arithmetic_exception_instance(); 131 assert(o != NULL, "should have been initialized"); 132 _ArithmeticException_instance = get_object(o)->as_instance(); 133 134 _ArrayIndexOutOfBoundsException_instance = NULL; 135 _ArrayStoreException_instance = NULL; 136 _ClassCastException_instance = NULL; 137 _the_null_string = NULL; 138 _the_min_jint_string = NULL; 139 } 140 141 ciEnv::ciEnv(Arena* arena) { 142 ASSERT_IN_VM; 143 144 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc. 145 CompilerThread* current_thread = CompilerThread::current(); 146 assert(current_thread->env() == NULL, "must be"); 147 current_thread->set_env(this); 148 assert(ciEnv::current() == this, "sanity"); 149 150 _oop_recorder = NULL; 151 _debug_info = NULL; 152 _dependencies = NULL; 153 _failure_reason = NULL; 154 _compilable = MethodCompilable_never; 155 _break_at_compile = false; 156 _compiler_data = NULL; 157 #ifndef PRODUCT 158 assert(firstEnv, "must be first"); 159 firstEnv = false; 160 #endif /* !PRODUCT */ 161 162 _system_dictionary_modification_counter = 0; 163 _num_inlined_bytecodes = 0; 164 _task = NULL; 165 _log = NULL; 166 167 // Temporary buffer for creating symbols and such. 168 _name_buffer = NULL; 169 _name_buffer_len = 0; 170 171 _arena = arena; 172 _factory = new (_arena) ciObjectFactory(_arena, 128); 173 174 // Preload commonly referenced system ciObjects. 175 176 // During VM initialization, these instances have not yet been created. 177 // Assertions ensure that these instances are not accessed before 178 // their initialization. 179 180 assert(Universe::is_fully_initialized(), "must be"); 181 182 _NullPointerException_instance = NULL; 183 _ArithmeticException_instance = NULL; 184 _ArrayIndexOutOfBoundsException_instance = NULL; 185 _ArrayStoreException_instance = NULL; 186 _ClassCastException_instance = NULL; 187 _the_null_string = NULL; 188 _the_min_jint_string = NULL; 189 } 190 191 ciEnv::~ciEnv() { 192 CompilerThread* current_thread = CompilerThread::current(); 193 _factory->remove_symbols(); 194 // Need safepoint to clear the env on the thread. RedefineClasses might 195 // be reading it. 196 GUARDED_VM_ENTRY(current_thread->set_env(NULL);) 197 } 198 199 // ------------------------------------------------------------------ 200 // Cache Jvmti state 201 void ciEnv::cache_jvmti_state() { 202 VM_ENTRY_MARK; 203 // Get Jvmti capabilities under lock to get consistant values. 204 MutexLocker mu(JvmtiThreadState_lock); 205 _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint(); 206 _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables(); 207 _jvmti_can_post_on_exceptions = JvmtiExport::can_post_on_exceptions(); 208 } 209 210 // ------------------------------------------------------------------ 211 // Cache DTrace flags 212 void ciEnv::cache_dtrace_flags() { 213 // Need lock? 214 _dtrace_extended_probes = ExtendedDTraceProbes; 215 if (_dtrace_extended_probes) { 216 _dtrace_monitor_probes = true; 217 _dtrace_method_probes = true; 218 _dtrace_alloc_probes = true; 219 } else { 220 _dtrace_monitor_probes = DTraceMonitorProbes; 221 _dtrace_method_probes = DTraceMethodProbes; 222 _dtrace_alloc_probes = DTraceAllocProbes; 223 } 224 } 225 226 // ------------------------------------------------------------------ 227 // helper for lazy exception creation 228 ciInstance* ciEnv::get_or_create_exception(jobject& handle, Symbol* name) { 229 VM_ENTRY_MARK; 230 if (handle == NULL) { 231 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance. 232 Klass* k = SystemDictionary::find(name, Handle(), Handle(), THREAD); 233 jobject objh = NULL; 234 if (!HAS_PENDING_EXCEPTION && k != NULL) { 235 oop obj = InstanceKlass::cast(k)->allocate_instance(THREAD); 236 if (!HAS_PENDING_EXCEPTION) 237 objh = JNIHandles::make_global(obj); 238 } 239 if (HAS_PENDING_EXCEPTION) { 240 CLEAR_PENDING_EXCEPTION; 241 } else { 242 handle = objh; 243 } 244 } 245 oop obj = JNIHandles::resolve(handle); 246 return obj == NULL? NULL: get_object(obj)->as_instance(); 247 } 248 249 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() { 250 if (_ArrayIndexOutOfBoundsException_instance == NULL) { 251 _ArrayIndexOutOfBoundsException_instance 252 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle, 253 vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); 254 } 255 return _ArrayIndexOutOfBoundsException_instance; 256 } 257 ciInstance* ciEnv::ArrayStoreException_instance() { 258 if (_ArrayStoreException_instance == NULL) { 259 _ArrayStoreException_instance 260 = get_or_create_exception(_ArrayStoreException_handle, 261 vmSymbols::java_lang_ArrayStoreException()); 262 } 263 return _ArrayStoreException_instance; 264 } 265 ciInstance* ciEnv::ClassCastException_instance() { 266 if (_ClassCastException_instance == NULL) { 267 _ClassCastException_instance 268 = get_or_create_exception(_ClassCastException_handle, 269 vmSymbols::java_lang_ClassCastException()); 270 } 271 return _ClassCastException_instance; 272 } 273 274 ciInstance* ciEnv::the_null_string() { 275 if (_the_null_string == NULL) { 276 VM_ENTRY_MARK; 277 _the_null_string = get_object(Universe::the_null_string())->as_instance(); 278 } 279 return _the_null_string; 280 } 281 282 ciInstance* ciEnv::the_min_jint_string() { 283 if (_the_min_jint_string == NULL) { 284 VM_ENTRY_MARK; 285 _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance(); 286 } 287 return _the_min_jint_string; 288 } 289 290 // ------------------------------------------------------------------ 291 // ciEnv::get_method_from_handle 292 ciMethod* ciEnv::get_method_from_handle(Method* method) { 293 VM_ENTRY_MARK; 294 return get_metadata(method)->as_method(); 295 } 296 297 // ------------------------------------------------------------------ 298 // ciEnv::array_element_offset_in_bytes 299 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) { 300 VM_ENTRY_MARK; 301 objArrayOop a = (objArrayOop)a_h->get_oop(); 302 assert(a->is_objArray(), ""); 303 int length = a->length(); 304 oop o = o_h->get_oop(); 305 for (int i = 0; i < length; i++) { 306 if (a->obj_at(i) == o) return i; 307 } 308 return -1; 309 } 310 311 312 // ------------------------------------------------------------------ 313 // ciEnv::check_klass_accessiblity 314 // 315 // Note: the logic of this method should mirror the logic of 316 // ConstantPool::verify_constant_pool_resolve. 317 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass, 318 Klass* resolved_klass) { 319 if (accessing_klass == NULL || !accessing_klass->is_loaded()) { 320 return true; 321 } 322 if (accessing_klass->is_obj_array_klass()) { 323 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass(); 324 } 325 if (!accessing_klass->is_instance_klass()) { 326 return true; 327 } 328 329 if (resolved_klass->oop_is_objArray()) { 330 // Find the element klass, if this is an array. 331 resolved_klass = ObjArrayKlass::cast(resolved_klass)->bottom_klass(); 332 } 333 if (resolved_klass->oop_is_instance()) { 334 return Reflection::verify_class_access(accessing_klass->get_Klass(), 335 resolved_klass, 336 true); 337 } 338 return true; 339 } 340 341 // ------------------------------------------------------------------ 342 // ciEnv::get_klass_by_name_impl 343 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass, 344 constantPoolHandle cpool, 345 ciSymbol* name, 346 bool require_local) { 347 ASSERT_IN_VM; 348 EXCEPTION_CONTEXT; 349 350 // Now we need to check the SystemDictionary 351 Symbol* sym = name->get_symbol(); 352 if (sym->byte_at(0) == 'L' && 353 sym->byte_at(sym->utf8_length()-1) == ';') { 354 // This is a name from a signature. Strip off the trimmings. 355 // Call recursive to keep scope of strippedsym. 356 TempNewSymbol strippedsym = SymbolTable::new_symbol(sym->as_utf8()+1, 357 sym->utf8_length()-2, 358 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass)); 359 ciSymbol* strippedname = get_symbol(strippedsym); 360 return get_klass_by_name_impl(accessing_klass, cpool, strippedname, require_local); 361 } 362 363 // Check for prior unloaded klass. The SystemDictionary's answers 364 // can vary over time but the compiler needs consistency. 365 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name); 366 if (unloaded_klass != NULL) { 367 if (require_local) return NULL; 368 return unloaded_klass; 369 } 370 371 Handle loader(THREAD, (oop)NULL); 372 Handle domain(THREAD, (oop)NULL); 373 if (accessing_klass != NULL) { 374 loader = Handle(THREAD, accessing_klass->loader()); 375 domain = Handle(THREAD, accessing_klass->protection_domain()); 376 } 377 378 // setup up the proper type to return on OOM 379 ciKlass* fail_type; 380 if (sym->byte_at(0) == '[') { 381 fail_type = _unloaded_ciobjarrayklass; 382 } else { 383 fail_type = _unloaded_ciinstance_klass; 384 } 385 KlassHandle found_klass; 386 { 387 ttyUnlocker ttyul; // release tty lock to avoid ordering problems 388 MutexLocker ml(Compile_lock); 389 Klass* kls; 390 if (!require_local) { 391 kls = SystemDictionary::find_constrained_instance_or_array_klass(sym, loader, 392 KILL_COMPILE_ON_FATAL_(fail_type)); 393 } else { 394 kls = SystemDictionary::find_instance_or_array_klass(sym, loader, domain, 395 KILL_COMPILE_ON_FATAL_(fail_type)); 396 } 397 found_klass = KlassHandle(THREAD, kls); 398 } 399 400 // If we fail to find an array klass, look again for its element type. 401 // The element type may be available either locally or via constraints. 402 // In either case, if we can find the element type in the system dictionary, 403 // we must build an array type around it. The CI requires array klasses 404 // to be loaded if their element klasses are loaded, except when memory 405 // is exhausted. 406 if (sym->byte_at(0) == '[' && 407 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) { 408 // We have an unloaded array. 409 // Build it on the fly if the element class exists. 410 TempNewSymbol elem_sym = SymbolTable::new_symbol(sym->as_utf8()+1, 411 sym->utf8_length()-1, 412 KILL_COMPILE_ON_FATAL_(fail_type)); 413 414 // Get element ciKlass recursively. 415 ciKlass* elem_klass = 416 get_klass_by_name_impl(accessing_klass, 417 cpool, 418 get_symbol(elem_sym), 419 require_local); 420 if (elem_klass != NULL && elem_klass->is_loaded()) { 421 // Now make an array for it 422 return ciObjArrayKlass::make_impl(elem_klass); 423 } 424 } 425 426 if (found_klass() == NULL && !cpool.is_null() && cpool->has_preresolution()) { 427 // Look inside the constant pool for pre-resolved class entries. 428 for (int i = cpool->length() - 1; i >= 1; i--) { 429 if (cpool->tag_at(i).is_klass()) { 430 Klass* kls = cpool->resolved_klass_at(i); 431 if (kls->name() == sym) { 432 found_klass = KlassHandle(THREAD, kls); 433 break; 434 } 435 } 436 } 437 } 438 439 if (found_klass() != NULL) { 440 // Found it. Build a CI handle. 441 return get_klass(found_klass()); 442 } 443 444 if (require_local) return NULL; 445 446 // Not yet loaded into the VM, or not governed by loader constraints. 447 // Make a CI representative for it. 448 return get_unloaded_klass(accessing_klass, name); 449 } 450 451 // ------------------------------------------------------------------ 452 // ciEnv::get_klass_by_name 453 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass, 454 ciSymbol* klass_name, 455 bool require_local) { 456 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass, 457 constantPoolHandle(), 458 klass_name, 459 require_local);) 460 } 461 462 // ------------------------------------------------------------------ 463 // ciEnv::get_klass_by_index_impl 464 // 465 // Implementation of get_klass_by_index. 466 ciKlass* ciEnv::get_klass_by_index_impl(constantPoolHandle cpool, 467 int index, 468 bool& is_accessible, 469 ciInstanceKlass* accessor) { 470 EXCEPTION_CONTEXT; 471 KlassHandle klass; // = NULL; 472 Symbol* klass_name = NULL; 473 474 if (cpool->tag_at(index).is_symbol()) { 475 klass_name = cpool->symbol_at(index); 476 } else { 477 // Check if it's resolved if it's not a symbol constant pool entry. 478 klass = KlassHandle(THREAD, ConstantPool::klass_at_if_loaded(cpool, index)); 479 480 if (klass.is_null()) { 481 // The klass has not been inserted into the constant pool. 482 // Try to look it up by name. 483 { 484 // We have to lock the cpool to keep the oop from being resolved 485 // while we are accessing it. 486 oop cplock = cpool->lock(); 487 ObjectLocker ol(cplock, THREAD, cplock != NULL); 488 constantTag tag = cpool->tag_at(index); 489 if (tag.is_klass()) { 490 // The klass has been inserted into the constant pool 491 // very recently. 492 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index)); 493 } else { 494 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag"); 495 klass_name = cpool->unresolved_klass_at(index); 496 } 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 cpool, 505 get_symbol(klass_name), 506 false); 507 // Calculate accessibility the hard way. 508 if (!k->is_loaded()) { 509 is_accessible = false; 510 } else if (k->loader() != accessor->loader() && 511 get_klass_by_name_impl(accessor, cpool, k->name(), true) == NULL) { 512 // Loaded only remotely. Not linked yet. 513 is_accessible = false; 514 } else { 515 // Linked locally, and we must also check public/private, etc. 516 is_accessible = check_klass_accessibility(accessor, k->get_Klass()); 517 } 518 return k; 519 } 520 521 // Check for prior unloaded klass. The SystemDictionary's answers 522 // can vary over time but the compiler needs consistency. 523 ciSymbol* name = get_symbol(klass()->name()); 524 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name); 525 if (unloaded_klass != NULL) { 526 is_accessible = false; 527 return unloaded_klass; 528 } 529 530 // It is known to be accessible, since it was found in the constant pool. 531 is_accessible = true; 532 return get_klass(klass()); 533 } 534 535 // ------------------------------------------------------------------ 536 // ciEnv::get_klass_by_index 537 // 538 // Get a klass from the constant pool. 539 ciKlass* ciEnv::get_klass_by_index(constantPoolHandle cpool, 540 int index, 541 bool& is_accessible, 542 ciInstanceKlass* accessor) { 543 GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);) 544 } 545 546 // ------------------------------------------------------------------ 547 // ciEnv::get_constant_by_index_impl 548 // 549 // Implementation of get_constant_by_index(). 550 ciConstant ciEnv::get_constant_by_index_impl(constantPoolHandle cpool, 551 int pool_index, int cache_index, 552 ciInstanceKlass* accessor) { 553 bool ignore_will_link; 554 EXCEPTION_CONTEXT; 555 int index = pool_index; 556 if (cache_index >= 0) { 557 assert(index < 0, "only one kind of index at a time"); 558 oop obj = cpool->resolved_references()->obj_at(cache_index); 559 if (obj != NULL) { 560 ciObject* ciobj = get_object(obj); 561 return ciConstant(T_OBJECT, ciobj); 562 } 563 index = cpool->object_to_cp_index(cache_index); 564 } 565 constantTag tag = cpool->tag_at(index); 566 if (tag.is_int()) { 567 return ciConstant(T_INT, (jint)cpool->int_at(index)); 568 } else if (tag.is_long()) { 569 return ciConstant((jlong)cpool->long_at(index)); 570 } else if (tag.is_float()) { 571 return ciConstant((jfloat)cpool->float_at(index)); 572 } else if (tag.is_double()) { 573 return ciConstant((jdouble)cpool->double_at(index)); 574 } else if (tag.is_string()) { 575 oop string = NULL; 576 assert(cache_index >= 0, "should have a cache index"); 577 if (cpool->is_pseudo_string_at(index)) { 578 string = cpool->pseudo_string_at(index, cache_index); 579 } else { 580 string = cpool->string_at(index, cache_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_method_type()) { 602 // must execute Java code to link this CP entry into cache[i].f1 603 ciSymbol* signature = get_symbol(cpool->method_type_signature_at(index)); 604 ciObject* ciobj = get_unloaded_method_type_constant(signature); 605 return ciConstant(T_OBJECT, ciobj); 606 } else if (tag.is_method_handle()) { 607 // must execute Java code to link this CP entry into cache[i].f1 608 int ref_kind = cpool->method_handle_ref_kind_at(index); 609 int callee_index = cpool->method_handle_klass_index_at(index); 610 ciKlass* callee = get_klass_by_index_impl(cpool, callee_index, ignore_will_link, accessor); 611 ciSymbol* name = get_symbol(cpool->method_handle_name_ref_at(index)); 612 ciSymbol* signature = get_symbol(cpool->method_handle_signature_ref_at(index)); 613 ciObject* ciobj = get_unloaded_method_handle_constant(callee, name, signature, ref_kind); 614 return ciConstant(T_OBJECT, ciobj); 615 } else { 616 ShouldNotReachHere(); 617 return ciConstant(); 618 } 619 } 620 621 // ------------------------------------------------------------------ 622 // ciEnv::get_constant_by_index 623 // 624 // Pull a constant out of the constant pool. How appropriate. 625 // 626 // Implementation note: this query is currently in no way cached. 627 ciConstant ciEnv::get_constant_by_index(constantPoolHandle cpool, 628 int pool_index, int cache_index, 629 ciInstanceKlass* accessor) { 630 GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, pool_index, cache_index, accessor);) 631 } 632 633 // ------------------------------------------------------------------ 634 // ciEnv::get_field_by_index_impl 635 // 636 // Implementation of get_field_by_index. 637 // 638 // Implementation note: the results of field lookups are cached 639 // in the accessor klass. 640 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor, 641 int index) { 642 ciConstantPoolCache* cache = accessor->field_cache(); 643 if (cache == NULL) { 644 ciField* field = new (arena()) ciField(accessor, index); 645 return field; 646 } else { 647 ciField* field = (ciField*)cache->get(index); 648 if (field == NULL) { 649 field = new (arena()) ciField(accessor, index); 650 cache->insert(index, field); 651 } 652 return field; 653 } 654 } 655 656 // ------------------------------------------------------------------ 657 // ciEnv::get_field_by_index 658 // 659 // Get a field by index from a klass's constant pool. 660 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor, 661 int index) { 662 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);) 663 } 664 665 // ------------------------------------------------------------------ 666 // ciEnv::lookup_method 667 // 668 // Perform an appropriate method lookup based on accessor, holder, 669 // name, signature, and bytecode. 670 Method* ciEnv::lookup_method(InstanceKlass* accessor, 671 InstanceKlass* holder, 672 Symbol* name, 673 Symbol* sig, 674 Bytecodes::Code bc) { 675 EXCEPTION_CONTEXT; 676 KlassHandle h_accessor(THREAD, accessor); 677 KlassHandle h_holder(THREAD, holder); 678 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL)); 679 methodHandle dest_method; 680 switch (bc) { 681 case Bytecodes::_invokestatic: 682 dest_method = 683 LinkResolver::resolve_static_call_or_null(h_holder, name, sig, h_accessor); 684 break; 685 case Bytecodes::_invokespecial: 686 dest_method = 687 LinkResolver::resolve_special_call_or_null(h_holder, name, sig, h_accessor); 688 break; 689 case Bytecodes::_invokeinterface: 690 dest_method = 691 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, name, sig, 692 h_accessor, true); 693 break; 694 case Bytecodes::_invokevirtual: 695 dest_method = 696 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, name, sig, 697 h_accessor, true); 698 break; 699 default: ShouldNotReachHere(); 700 } 701 702 return dest_method(); 703 } 704 705 706 // ------------------------------------------------------------------ 707 // ciEnv::get_method_by_index_impl 708 ciMethod* ciEnv::get_method_by_index_impl(constantPoolHandle cpool, 709 int index, Bytecodes::Code bc, 710 ciInstanceKlass* accessor) { 711 if (bc == Bytecodes::_invokedynamic) { 712 ConstantPoolCacheEntry* cpce = cpool->invokedynamic_cp_cache_entry_at(index); 713 bool is_resolved = !cpce->is_f1_null(); 714 // FIXME: code generation could allow for null (unlinked) call site 715 // The call site could be made patchable as follows: 716 // Load the appendix argument from the constant pool. 717 // Test the appendix argument and jump to a known deopt routine if it is null. 718 // Jump through a patchable call site, which is initially a deopt routine. 719 // Patch the call site to the nmethod entry point of the static compiled lambda form. 720 // As with other two-component call sites, both values must be independently verified. 721 722 if (is_resolved) { 723 // Get the invoker Method* from the constant pool. 724 // (The appendix argument, if any, will be noted in the method's signature.) 725 Method* adapter = cpce->f1_as_method(); 726 return get_method(adapter); 727 } 728 729 // Fake a method that is equivalent to a declared method. 730 ciInstanceKlass* holder = get_instance_klass(SystemDictionary::MethodHandle_klass()); 731 ciSymbol* name = ciSymbol::invokeBasic_name(); 732 ciSymbol* signature = get_symbol(cpool->signature_ref_at(index)); 733 return get_unloaded_method(holder, name, signature, accessor); 734 } else { 735 const int holder_index = cpool->klass_ref_index_at(index); 736 bool holder_is_accessible; 737 ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor); 738 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder); 739 740 // Get the method's name and signature. 741 Symbol* name_sym = cpool->name_ref_at(index); 742 Symbol* sig_sym = cpool->signature_ref_at(index); 743 744 if (cpool->has_preresolution() 745 || (holder == ciEnv::MethodHandle_klass() && 746 MethodHandles::is_signature_polymorphic_name(holder->get_Klass(), name_sym))) { 747 // Short-circuit lookups for JSR 292-related call sites. 748 // That is, do not rely only on name-based lookups, because they may fail 749 // if the names are not resolvable in the boot class loader (7056328). 750 switch (bc) { 751 case Bytecodes::_invokevirtual: 752 case Bytecodes::_invokeinterface: 753 case Bytecodes::_invokespecial: 754 case Bytecodes::_invokestatic: 755 { 756 Method* m = ConstantPool::method_at_if_loaded(cpool, index); 757 if (m != NULL) { 758 return get_method(m); 759 } 760 } 761 break; 762 } 763 } 764 765 if (holder_is_accessible) { // Our declared holder is loaded. 766 InstanceKlass* lookup = declared_holder->get_instanceKlass(); 767 Method* m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc); 768 if (m != NULL && 769 (bc == Bytecodes::_invokestatic 770 ? m->method_holder()->is_not_initialized() 771 : !m->method_holder()->is_loaded())) { 772 m = NULL; 773 } 774 #ifdef ASSERT 775 if (m != NULL && ReplayCompiles && !ciReplay::is_loaded(m)) { 776 m = NULL; 777 } 778 #endif 779 if (m != NULL) { 780 // We found the method. 781 return get_method(m); 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 ciSymbol* name = get_symbol(name_sym); 789 ciSymbol* signature = get_symbol(sig_sym); 790 return get_unloaded_method(declared_holder, name, signature, accessor); 791 } 792 } 793 794 795 // ------------------------------------------------------------------ 796 // ciEnv::get_instance_klass_for_declared_method_holder 797 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) { 798 // For the case of <array>.clone(), the method holder can be a ciArrayKlass 799 // instead of a ciInstanceKlass. For that case simply pretend that the 800 // declared holder is Object.clone since that's where the call will bottom out. 801 // A more correct fix would trickle out through many interfaces in CI, 802 // requiring ciInstanceKlass* to become ciKlass* and many more places would 803 // require checks to make sure the expected type was found. Given that this 804 // only occurs for clone() the more extensive fix seems like overkill so 805 // instead we simply smear the array type into Object. 806 guarantee(method_holder != NULL, "no method holder"); 807 if (method_holder->is_instance_klass()) { 808 return method_holder->as_instance_klass(); 809 } else if (method_holder->is_array_klass()) { 810 return current()->Object_klass(); 811 } else { 812 ShouldNotReachHere(); 813 } 814 return NULL; 815 } 816 817 818 // ------------------------------------------------------------------ 819 // ciEnv::get_method_by_index 820 ciMethod* ciEnv::get_method_by_index(constantPoolHandle cpool, 821 int index, Bytecodes::Code bc, 822 ciInstanceKlass* accessor) { 823 GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);) 824 } 825 826 827 // ------------------------------------------------------------------ 828 // ciEnv::name_buffer 829 char *ciEnv::name_buffer(int req_len) { 830 if (_name_buffer_len < req_len) { 831 if (_name_buffer == NULL) { 832 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len); 833 _name_buffer_len = req_len; 834 } else { 835 _name_buffer = 836 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len); 837 _name_buffer_len = req_len; 838 } 839 } 840 return _name_buffer; 841 } 842 843 // ------------------------------------------------------------------ 844 // ciEnv::is_in_vm 845 bool ciEnv::is_in_vm() { 846 return JavaThread::current()->thread_state() == _thread_in_vm; 847 } 848 849 bool ciEnv::system_dictionary_modification_counter_changed() { 850 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications(); 851 } 852 853 // ------------------------------------------------------------------ 854 // ciEnv::validate_compile_task_dependencies 855 // 856 // Check for changes during compilation (e.g. class loads, evolution, 857 // breakpoints, call site invalidation). 858 void ciEnv::validate_compile_task_dependencies(ciMethod* target) { 859 if (failing()) return; // no need for further checks 860 861 // First, check non-klass dependencies as we might return early and 862 // not check klass dependencies if the system dictionary 863 // modification counter hasn't changed (see below). 864 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) { 865 if (deps.is_klass_type()) continue; // skip klass dependencies 866 Klass* witness = deps.check_dependency(); 867 if (witness != NULL) { 868 record_failure("invalid non-klass dependency"); 869 return; 870 } 871 } 872 873 // Klass dependencies must be checked when the system dictionary 874 // changes. If logging is enabled all violated dependences will be 875 // recorded in the log. In debug mode check dependencies even if 876 // the system dictionary hasn't changed to verify that no invalid 877 // dependencies were inserted. Any violated dependences in this 878 // case are dumped to the tty. 879 bool counter_changed = system_dictionary_modification_counter_changed(); 880 881 bool verify_deps = trueInDebug; 882 if (!counter_changed && !verify_deps) return; 883 884 int klass_violations = 0; 885 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) { 886 if (!deps.is_klass_type()) continue; // skip non-klass dependencies 887 Klass* witness = deps.check_dependency(); 888 if (witness != NULL) { 889 klass_violations++; 890 if (!counter_changed) { 891 // Dependence failed but counter didn't change. Log a message 892 // describing what failed and allow the assert at the end to 893 // trigger. 894 deps.print_dependency(witness); 895 } else if (xtty == NULL) { 896 // If we're not logging then a single violation is sufficient, 897 // otherwise we want to log all the dependences which were 898 // violated. 899 break; 900 } 901 } 902 } 903 904 if (klass_violations != 0) { 905 #ifdef ASSERT 906 if (!counter_changed && !PrintCompilation) { 907 // Print out the compile task that failed 908 _task->print_line(); 909 } 910 #endif 911 assert(counter_changed, "failed dependencies, but counter didn't change"); 912 record_failure("concurrent class loading"); 913 } 914 } 915 916 // ------------------------------------------------------------------ 917 // ciEnv::register_method 918 void ciEnv::register_method(ciMethod* target, 919 int entry_bci, 920 CodeOffsets* offsets, 921 int orig_pc_offset, 922 CodeBuffer* code_buffer, 923 int frame_words, 924 OopMapSet* oop_map_set, 925 ExceptionHandlerTable* handler_table, 926 ImplicitExceptionTable* inc_table, 927 AbstractCompiler* compiler, 928 int comp_level, 929 bool has_unsafe_access, 930 bool has_wide_vectors) { 931 VM_ENTRY_MARK; 932 nmethod* nm = NULL; 933 { 934 // To prevent compile queue updates. 935 MutexLocker locker(MethodCompileQueue_lock, THREAD); 936 937 // Prevent SystemDictionary::add_to_hierarchy from running 938 // and invalidating our dependencies until we install this method. 939 MutexLocker ml(Compile_lock); 940 941 // Change in Jvmti state may invalidate compilation. 942 if (!failing() && 943 ( (!jvmti_can_hotswap_or_post_breakpoint() && 944 JvmtiExport::can_hotswap_or_post_breakpoint()) || 945 (!jvmti_can_access_local_variables() && 946 JvmtiExport::can_access_local_variables()) || 947 (!jvmti_can_post_on_exceptions() && 948 JvmtiExport::can_post_on_exceptions()) )) { 949 record_failure("Jvmti state change invalidated dependencies"); 950 } 951 952 // Change in DTrace flags may invalidate compilation. 953 if (!failing() && 954 ( (!dtrace_extended_probes() && ExtendedDTraceProbes) || 955 (!dtrace_method_probes() && DTraceMethodProbes) || 956 (!dtrace_alloc_probes() && DTraceAllocProbes) )) { 957 record_failure("DTrace flags change invalidated dependencies"); 958 } 959 960 if (!failing()) { 961 if (log() != NULL) { 962 // Log the dependencies which this compilation declares. 963 dependencies()->log_all_dependencies(); 964 } 965 966 // Encode the dependencies now, so we can check them right away. 967 dependencies()->encode_content_bytes(); 968 969 // Check for {class loads, evolution, breakpoints, ...} during compilation 970 validate_compile_task_dependencies(target); 971 } 972 973 methodHandle method(THREAD, target->get_Method()); 974 975 if (failing()) { 976 // While not a true deoptimization, it is a preemptive decompile. 977 MethodData* mdo = method()->method_data(); 978 if (mdo != NULL) { 979 mdo->inc_decompile_count(); 980 } 981 982 // All buffers in the CodeBuffer are allocated in the CodeCache. 983 // If the code buffer is created on each compile attempt 984 // as in C2, then it must be freed. 985 code_buffer->free_blob(); 986 return; 987 } 988 989 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry"); 990 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry"); 991 992 nm = nmethod::new_nmethod(method, 993 compile_id(), 994 entry_bci, 995 offsets, 996 orig_pc_offset, 997 debug_info(), dependencies(), code_buffer, 998 frame_words, oop_map_set, 999 handler_table, inc_table, 1000 compiler, comp_level); 1001 1002 // Free codeBlobs 1003 code_buffer->free_blob(); 1004 1005 // stress test 6243940 by immediately making the method 1006 // non-entrant behind the system's back. This has serious 1007 // side effects on the code cache and is not meant for 1008 // general stress testing 1009 if (nm != NULL && StressNonEntrant) { 1010 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1011 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(), 1012 SharedRuntime::get_handle_wrong_method_stub()); 1013 } 1014 1015 if (nm == NULL) { 1016 // The CodeCache is full. Print out warning and disable compilation. 1017 record_failure("code cache is full"); 1018 { 1019 MutexUnlocker ml(Compile_lock); 1020 MutexUnlocker locker(MethodCompileQueue_lock); 1021 CompileBroker::handle_full_code_cache(); 1022 } 1023 } else { 1024 nm->set_has_unsafe_access(has_unsafe_access); 1025 nm->set_has_wide_vectors(has_wide_vectors); 1026 1027 // Record successful registration. 1028 // (Put nm into the task handle *before* publishing to the Java heap.) 1029 if (task() != NULL) task()->set_code(nm); 1030 1031 if (entry_bci == InvocationEntryBci) { 1032 if (TieredCompilation) { 1033 // If there is an old version we're done with it 1034 nmethod* old = method->code(); 1035 if (TraceMethodReplacement && old != NULL) { 1036 ResourceMark rm; 1037 char *method_name = method->name_and_sig_as_C_string(); 1038 tty->print_cr("Replacing method %s", method_name); 1039 } 1040 if (old != NULL) { 1041 old->make_not_entrant(); 1042 } 1043 } 1044 if (TraceNMethodInstalls) { 1045 ResourceMark rm; 1046 char *method_name = method->name_and_sig_as_C_string(); 1047 ttyLocker ttyl; 1048 tty->print_cr("Installing method (%d) %s ", 1049 comp_level, 1050 method_name); 1051 } 1052 // Allow the code to be executed 1053 method->set_code(method, nm); 1054 } else { 1055 if (TraceNMethodInstalls) { 1056 ResourceMark rm; 1057 char *method_name = method->name_and_sig_as_C_string(); 1058 ttyLocker ttyl; 1059 tty->print_cr("Installing osr method (%d) %s @ %d", 1060 comp_level, 1061 method_name, 1062 entry_bci); 1063 } 1064 method->method_holder()->add_osr_nmethod(nm); 1065 1066 } 1067 } 1068 } 1069 // JVMTI -- compiled method notification (must be done outside lock) 1070 if (nm != NULL) { 1071 nm->post_compiled_method_load_event(); 1072 } 1073 1074 } 1075 1076 1077 // ------------------------------------------------------------------ 1078 // ciEnv::find_system_klass 1079 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) { 1080 VM_ENTRY_MARK; 1081 return get_klass_by_name_impl(NULL, constantPoolHandle(), klass_name, false); 1082 } 1083 1084 // ------------------------------------------------------------------ 1085 // ciEnv::comp_level 1086 int ciEnv::comp_level() { 1087 if (task() == NULL) return CompLevel_highest_tier; 1088 return task()->comp_level(); 1089 } 1090 1091 // ------------------------------------------------------------------ 1092 // ciEnv::compile_id 1093 uint ciEnv::compile_id() { 1094 if (task() == NULL) return 0; 1095 return task()->compile_id(); 1096 } 1097 1098 // ------------------------------------------------------------------ 1099 // ciEnv::notice_inlined_method() 1100 void ciEnv::notice_inlined_method(ciMethod* method) { 1101 _num_inlined_bytecodes += method->code_size_for_inlining(); 1102 } 1103 1104 // ------------------------------------------------------------------ 1105 // ciEnv::num_inlined_bytecodes() 1106 int ciEnv::num_inlined_bytecodes() const { 1107 return _num_inlined_bytecodes; 1108 } 1109 1110 // ------------------------------------------------------------------ 1111 // ciEnv::record_failure() 1112 void ciEnv::record_failure(const char* reason) { 1113 if (log() != NULL) { 1114 log()->elem("failure reason='%s'", reason); 1115 } 1116 if (_failure_reason == NULL) { 1117 // Record the first failure reason. 1118 _failure_reason = reason; 1119 } 1120 } 1121 1122 // ------------------------------------------------------------------ 1123 // ciEnv::record_method_not_compilable() 1124 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) { 1125 int new_compilable = 1126 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ; 1127 1128 // Only note transitions to a worse state 1129 if (new_compilable > _compilable) { 1130 if (log() != NULL) { 1131 if (all_tiers) { 1132 log()->elem("method_not_compilable"); 1133 } else { 1134 log()->elem("method_not_compilable_at_tier level='%d'", 1135 current()->task()->comp_level()); 1136 } 1137 } 1138 _compilable = new_compilable; 1139 1140 // Reset failure reason; this one is more important. 1141 _failure_reason = NULL; 1142 record_failure(reason); 1143 } 1144 } 1145 1146 // ------------------------------------------------------------------ 1147 // ciEnv::record_out_of_memory_failure() 1148 void ciEnv::record_out_of_memory_failure() { 1149 // If memory is low, we stop compiling methods. 1150 record_method_not_compilable("out of memory"); 1151 } 1152 1153 void ciEnv::dump_replay_data(outputStream* out) { 1154 VM_ENTRY_MARK; 1155 MutexLocker ml(Compile_lock); 1156 ResourceMark rm; 1157 #if INCLUDE_JVMTI 1158 out->print_cr("JvmtiExport can_access_local_variables %d", _jvmti_can_access_local_variables); 1159 out->print_cr("JvmtiExport can_hotswap_or_post_breakpoint %d", _jvmti_can_hotswap_or_post_breakpoint); 1160 out->print_cr("JvmtiExport can_post_on_exceptions %d", _jvmti_can_post_on_exceptions); 1161 #endif // INCLUDE_JVMTI 1162 1163 GrowableArray<ciMetadata*>* objects = _factory->get_ci_metadata(); 1164 out->print_cr("# %d ciObject found", objects->length()); 1165 for (int i = 0; i < objects->length(); i++) { 1166 objects->at(i)->dump_replay_data(out); 1167 } 1168 CompileTask* task = this->task(); 1169 Method* method = task->method(); 1170 int entry_bci = task->osr_bci(); 1171 int comp_level = task->comp_level(); 1172 // Klass holder = method->method_holder(); 1173 out->print_cr("compile %s %s %s %d %d", 1174 method->klass_name()->as_quoted_ascii(), 1175 method->name()->as_quoted_ascii(), 1176 method->signature()->as_quoted_ascii(), 1177 entry_bci, comp_level); 1178 out->flush(); 1179 }