1 /* 2 * Copyright (c) 1997, 2025, 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 "cds/cdsConfig.hpp" 26 #include "cds/cppVtables.hpp" 27 #include "cds/metaspaceShared.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderDataGraph.hpp" 30 #include "classfile/metadataOnStackMark.hpp" 31 #include "classfile/symbolTable.hpp" 32 #include "classfile/systemDictionary.hpp" 33 #include "classfile/vmClasses.hpp" 34 #include "code/codeCache.hpp" 35 #include "code/debugInfoRec.hpp" 36 #include "compiler/compilationPolicy.hpp" 37 #include "gc/shared/collectedHeap.inline.hpp" 38 #include "interpreter/bytecodeStream.hpp" 39 #include "interpreter/bytecodeTracer.hpp" 40 #include "interpreter/bytecodes.hpp" 41 #include "interpreter/interpreter.hpp" 42 #include "interpreter/oopMapCache.hpp" 43 #include "logging/log.hpp" 44 #include "logging/logStream.hpp" 45 #include "logging/logTag.hpp" 46 #include "memory/allocation.inline.hpp" 47 #include "memory/metadataFactory.hpp" 48 #include "memory/metaspaceClosure.hpp" 49 #include "memory/oopFactory.hpp" 50 #include "memory/resourceArea.hpp" 51 #include "memory/universe.hpp" 52 #include "nmt/memTracker.hpp" 53 #include "oops/constMethod.hpp" 54 #include "oops/constantPool.hpp" 55 #include "oops/klass.inline.hpp" 56 #include "oops/method.inline.hpp" 57 #include "oops/methodData.hpp" 58 #include "oops/objArrayKlass.hpp" 59 #include "oops/objArrayOop.inline.hpp" 60 #include "oops/oop.inline.hpp" 61 #include "oops/symbol.hpp" 62 #include "oops/trainingData.hpp" 63 #include "prims/jvmtiExport.hpp" 64 #include "prims/methodHandles.hpp" 65 #include "runtime/atomic.hpp" 66 #include "runtime/arguments.hpp" 67 #include "runtime/continuationEntry.hpp" 68 #include "runtime/frame.inline.hpp" 69 #include "runtime/handles.inline.hpp" 70 #include "runtime/init.hpp" 71 #include "runtime/java.hpp" 72 #include "runtime/orderAccess.hpp" 73 #include "runtime/perfData.hpp" 74 #include "runtime/relocator.hpp" 75 #include "runtime/safepointVerifiers.hpp" 76 #include "runtime/sharedRuntime.hpp" 77 #include "runtime/signature.hpp" 78 #include "runtime/threads.hpp" 79 #include "runtime/vm_version.hpp" 80 #include "utilities/align.hpp" 81 #include "utilities/quickSort.hpp" 82 #include "utilities/vmError.hpp" 83 #include "utilities/xmlstream.hpp" 84 85 // Implementation of Method 86 87 Method* Method::allocate(ClassLoaderData* loader_data, 88 int byte_code_size, 89 AccessFlags access_flags, 90 InlineTableSizes* sizes, 91 ConstMethod::MethodType method_type, 92 Symbol* name, 93 TRAPS) { 94 assert(!access_flags.is_native() || byte_code_size == 0, 95 "native methods should not contain byte codes"); 96 ConstMethod* cm = ConstMethod::allocate(loader_data, 97 byte_code_size, 98 sizes, 99 method_type, 100 CHECK_NULL); 101 int size = Method::size(access_flags.is_native()); 102 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name); 103 } 104 105 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) { 106 NoSafepointVerifier no_safepoint; 107 set_constMethod(xconst); 108 set_access_flags(access_flags); 109 set_intrinsic_id(vmIntrinsics::_none); 110 clear_method_data(); 111 clear_method_counters(); 112 set_vtable_index(Method::garbage_vtable_index); 113 114 // Fix and bury in Method* 115 set_interpreter_entry(nullptr); // sets i2i entry and from_int 116 set_adapter_entry(nullptr); 117 Method::clear_code(); // from_c/from_i get set to c2i/i2i 118 119 if (access_flags.is_native()) { 120 clear_native_function(); 121 set_signature_handler(nullptr); 122 } 123 124 NOT_PRODUCT(set_compiled_invocation_count(0);) 125 // Name is very useful for debugging. 126 NOT_PRODUCT(_name = name;) 127 } 128 129 // Release Method*. The nmethod will be gone when we get here because 130 // we've walked the code cache. 131 void Method::deallocate_contents(ClassLoaderData* loader_data) { 132 MetadataFactory::free_metadata(loader_data, constMethod()); 133 set_constMethod(nullptr); 134 MetadataFactory::free_metadata(loader_data, method_data()); 135 clear_method_data(); 136 MetadataFactory::free_metadata(loader_data, method_counters()); 137 clear_method_counters(); 138 // The nmethod will be gone when we get here. 139 if (code() != nullptr) _code = nullptr; 140 } 141 142 void Method::release_C_heap_structures() { 143 if (method_data()) { 144 method_data()->release_C_heap_structures(); 145 146 // Destroy MethodData embedded lock 147 method_data()->~MethodData(); 148 } 149 } 150 151 address Method::get_i2c_entry() { 152 assert(adapter() != nullptr, "must have"); 153 return adapter()->get_i2c_entry(); 154 } 155 156 address Method::get_c2i_entry() { 157 assert(adapter() != nullptr, "must have"); 158 return adapter()->get_c2i_entry(); 159 } 160 161 address Method::get_c2i_unverified_entry() { 162 assert(adapter() != nullptr, "must have"); 163 return adapter()->get_c2i_unverified_entry(); 164 } 165 166 address Method::get_c2i_no_clinit_check_entry() { 167 assert(VM_Version::supports_fast_class_init_checks(), ""); 168 assert(adapter() != nullptr, "must have"); 169 return adapter()->get_c2i_no_clinit_check_entry(); 170 } 171 172 char* Method::name_and_sig_as_C_string() const { 173 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 174 } 175 176 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 177 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 178 } 179 180 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 181 const char* klass_name = klass->external_name(); 182 int klass_name_len = (int)strlen(klass_name); 183 int method_name_len = method_name->utf8_length(); 184 int len = klass_name_len + 2 + method_name_len + signature->utf8_length(); 185 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 186 strcpy(dest, klass_name); 187 dest[klass_name_len + 0] = ':'; 188 dest[klass_name_len + 1] = ':'; 189 strcpy(&dest[klass_name_len + 2], method_name->as_C_string()); 190 strcpy(&dest[klass_name_len + 2 + method_name_len], signature->as_C_string()); 191 dest[len] = 0; 192 return dest; 193 } 194 195 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 196 Symbol* klass_name = klass->name(); 197 klass_name->as_klass_external_name(buf, size); 198 int len = (int)strlen(buf); 199 200 if (len < size - 1) { 201 buf[len++] = '.'; 202 203 method_name->as_C_string(&(buf[len]), size - len); 204 len = (int)strlen(buf); 205 206 signature->as_C_string(&(buf[len]), size - len); 207 } 208 209 return buf; 210 } 211 212 const char* Method::external_name() const { 213 return external_name(constants()->pool_holder(), name(), signature()); 214 } 215 216 void Method::print_external_name(outputStream *os) const { 217 print_external_name(os, constants()->pool_holder(), name(), signature()); 218 } 219 220 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) { 221 stringStream ss; 222 print_external_name(&ss, klass, method_name, signature); 223 return ss.as_string(); 224 } 225 226 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) { 227 signature->print_as_signature_external_return_type(os); 228 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string()); 229 signature->print_as_signature_external_parameters(os); 230 os->print(")"); 231 } 232 233 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) { 234 if (log_is_enabled(Debug, exceptions)) { 235 ResourceMark rm(THREAD); 236 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"", 237 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string()); 238 } 239 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 240 // access exception table 241 ExceptionTable table(mh()); 242 int length = table.length(); 243 // iterate through all entries sequentially 244 constantPoolHandle pool(THREAD, mh->constants()); 245 for (int i = 0; i < length; i ++) { 246 //reacquire the table in case a GC happened 247 ExceptionTable table(mh()); 248 int beg_bci = table.start_pc(i); 249 int end_bci = table.end_pc(i); 250 assert(beg_bci <= end_bci, "inconsistent exception table"); 251 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d", 252 beg_bci, end_bci); 253 254 if (beg_bci <= throw_bci && throw_bci < end_bci) { 255 // exception handler bci range covers throw_bci => investigate further 256 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci); 257 258 int handler_bci = table.handler_pc(i); 259 int klass_index = table.catch_type_index(i); 260 if (klass_index == 0) { 261 if (log_is_enabled(Info, exceptions)) { 262 ResourceMark rm(THREAD); 263 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d", 264 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci); 265 } 266 return handler_bci; 267 } else if (ex_klass == nullptr) { 268 // Is this even possible? 269 if (log_is_enabled(Info, exceptions)) { 270 ResourceMark rm(THREAD); 271 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d", 272 mh()->name()->as_C_string(), handler_bci); 273 } 274 return handler_bci; 275 } else { 276 if (log_is_enabled(Debug, exceptions)) { 277 ResourceMark rm(THREAD); 278 log_debug(exceptions)(" - resolving catch type \"%s\"", 279 pool->klass_name_at(klass_index)->as_C_string()); 280 } 281 // we know the exception class => get the constraint class 282 // this may require loading of the constraint class; if verification 283 // fails or some other exception occurs, return handler_bci 284 Klass* k = pool->klass_at(klass_index, THREAD); 285 if (HAS_PENDING_EXCEPTION) { 286 if (log_is_enabled(Debug, exceptions)) { 287 ResourceMark rm(THREAD); 288 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type", 289 PENDING_EXCEPTION->klass()->external_name()); 290 } 291 return handler_bci; 292 } 293 assert(k != nullptr, "klass not loaded"); 294 if (ex_klass->is_subtype_of(k)) { 295 if (log_is_enabled(Info, exceptions)) { 296 ResourceMark rm(THREAD); 297 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d", 298 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci); 299 } 300 return handler_bci; 301 } 302 } 303 } 304 } 305 306 if (log_is_enabled(Debug, exceptions)) { 307 ResourceMark rm(THREAD); 308 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"", 309 ex_klass->external_name(), mh->name()->as_C_string()); 310 } 311 312 return -1; 313 } 314 315 void Method::mask_for(int bci, InterpreterOopMap* mask) { 316 methodHandle h_this(Thread::current(), this); 317 mask_for(h_this, bci, mask); 318 } 319 320 void Method::mask_for(const methodHandle& this_mh, int bci, InterpreterOopMap* mask) { 321 assert(this_mh() == this, "Sanity"); 322 method_holder()->mask_for(this_mh, bci, mask); 323 } 324 325 int Method::bci_from(address bcp) const { 326 if (is_native() && bcp == nullptr) { 327 return 0; 328 } 329 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code 330 // may call this after interrupting a nested ResourceMark. 331 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(), 332 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp)); 333 334 return int(bcp - code_base()); 335 } 336 337 338 int Method::validate_bci(int bci) const { 339 // Called from the verifier, and should return -1 if not valid. 340 return ((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size())) ? bci : -1; 341 } 342 343 // Return bci if it appears to be a valid bcp 344 // Return -1 otherwise. 345 // Used by profiling code, when invalid data is a possibility. 346 // The caller is responsible for validating the Method* itself. 347 int Method::validate_bci_from_bcp(address bcp) const { 348 // keep bci as -1 if not a valid bci 349 int bci = -1; 350 if (bcp == nullptr || bcp == code_base()) { 351 // code_size() may return 0 and we allow 0 here 352 // the method may be native 353 bci = 0; 354 } else if (contains(bcp)) { 355 bci = int(bcp - code_base()); 356 } 357 // Assert that if we have dodged any asserts, bci is negative. 358 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 359 return bci; 360 } 361 362 address Method::bcp_from(int bci) const { 363 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), 364 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native"); 365 address bcp = code_base() + bci; 366 assert((is_native() && bcp == code_base()) || contains(bcp), "bcp doesn't belong to this method"); 367 return bcp; 368 } 369 370 address Method::bcp_from(address bcp) const { 371 if (is_native() && bcp == nullptr) { 372 return code_base(); 373 } else { 374 return bcp; 375 } 376 } 377 378 int Method::size(bool is_native) { 379 // If native, then include pointers for native_function and signature_handler 380 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 381 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord; 382 return align_metadata_size(header_size() + extra_words); 383 } 384 385 Symbol* Method::klass_name() const { 386 return method_holder()->name(); 387 } 388 389 void Method::metaspace_pointers_do(MetaspaceClosure* it) { 390 LogStreamHandle(Trace, cds) lsh; 391 if (lsh.is_enabled()) { 392 lsh.print("Iter(Method): %p ", this); 393 print_external_name(&lsh); 394 lsh.cr(); 395 } 396 if (method_holder() != nullptr && !method_holder()->is_rewritten()) { 397 // holder is null for MH intrinsic methods 398 it->push(&_constMethod, MetaspaceClosure::_writable); 399 } else { 400 it->push(&_constMethod); 401 } 402 it->push(&_adapter); 403 it->push(&_method_data); 404 it->push(&_method_counters); 405 NOT_PRODUCT(it->push(&_name);) 406 } 407 408 #if INCLUDE_CDS 409 // Attempt to return method to original state. Clear any pointers 410 // (to objects outside the shared spaces). We won't be able to predict 411 // where they should point in a new JVM. Further initialize some 412 // entries now in order allow them to be write protected later. 413 414 void Method::remove_unshareable_info() { 415 unlink_method(); 416 if (CDSConfig::is_dumping_adapters() && _adapter != nullptr) { 417 _adapter->remove_unshareable_info(); 418 } 419 if (method_data() != nullptr) { 420 method_data()->remove_unshareable_info(); 421 } 422 if (method_counters() != nullptr) { 423 method_counters()->remove_unshareable_info(); 424 } 425 JFR_ONLY(REMOVE_METHOD_ID(this);) 426 } 427 428 void Method::restore_adapter(TRAPS) { 429 if (_adapter != nullptr) { 430 _adapter->restore_unshareable_info(CHECK); 431 _from_compiled_entry = _adapter->get_c2i_entry(); 432 } 433 } 434 435 void Method::restore_unshareable_info(TRAPS) { 436 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored"); 437 restore_adapter(CHECK); 438 if (method_data() != nullptr) { 439 method_data()->restore_unshareable_info(CHECK); 440 } 441 if (method_counters() != nullptr) { 442 method_counters()->restore_unshareable_info(CHECK); 443 } 444 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set"); 445 assert(!pending_queue_processed(), "method's pending_queued_processed flag should not be set"); 446 } 447 #endif 448 449 void Method::set_vtable_index(int index) { 450 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) { 451 // At runtime initialize_vtable is rerun as part of link_class_impl() 452 // for a shared class loaded by the non-boot loader to obtain the loader 453 // constraints based on the runtime classloaders' context. 454 return; // don't write into the shared class 455 } else { 456 _vtable_index = index; 457 } 458 } 459 460 void Method::set_itable_index(int index) { 461 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) { 462 // At runtime initialize_itable is rerun as part of link_class_impl() 463 // for a shared class loaded by the non-boot loader to obtain the loader 464 // constraints based on the runtime classloaders' context. The dumptime 465 // itable index should be the same as the runtime index. 466 assert(_vtable_index == itable_index_max - index, 467 "archived itable index is different from runtime index"); 468 return; // don’t write into the shared class 469 } else { 470 _vtable_index = itable_index_max - index; 471 } 472 assert(valid_itable_index(), ""); 473 } 474 475 // The RegisterNatives call being attempted tried to register with a method that 476 // is not native. Ask JVM TI what prefixes have been specified. Then check 477 // to see if the native method is now wrapped with the prefixes. See the 478 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details. 479 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) { 480 #if INCLUDE_JVMTI 481 ResourceMark rm(THREAD); 482 Method* method; 483 int name_len = name->utf8_length(); 484 char* name_str = name->as_utf8(); 485 int prefix_count; 486 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count); 487 for (int i = 0; i < prefix_count; i++) { 488 char* prefix = prefixes[i]; 489 int prefix_len = (int)strlen(prefix); 490 491 // try adding this prefix to the method name and see if it matches another method name 492 int trial_len = name_len + prefix_len; 493 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1); 494 strcpy(trial_name_str, prefix); 495 strcat(trial_name_str, name_str); 496 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len); 497 if (trial_name == nullptr) { 498 continue; // no such symbol, so this prefix wasn't used, try the next prefix 499 } 500 method = k->lookup_method(trial_name, signature); 501 if (method == nullptr) { 502 continue; // signature doesn't match, try the next prefix 503 } 504 if (method->is_native()) { 505 method->set_is_prefixed_native(); 506 return method; // wahoo, we found a prefixed version of the method, return it 507 } 508 // found as non-native, so prefix is good, add it, probably just need more prefixes 509 name_len = trial_len; 510 name_str = trial_name_str; 511 } 512 #endif // INCLUDE_JVMTI 513 return nullptr; // not found 514 } 515 516 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) { 517 Method* method = k->lookup_method(name, signature); 518 if (method == nullptr) { 519 ResourceMark rm(THREAD); 520 stringStream st; 521 st.print("Method '"); 522 print_external_name(&st, k, name, signature); 523 st.print("' name or signature does not match"); 524 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false); 525 } 526 if (!method->is_native()) { 527 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es) 528 method = find_prefixed_native(k, name, signature, THREAD); 529 if (method == nullptr) { 530 ResourceMark rm(THREAD); 531 stringStream st; 532 st.print("Method '"); 533 print_external_name(&st, k, name, signature); 534 st.print("' is not declared as native"); 535 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false); 536 } 537 } 538 539 if (entry != nullptr) { 540 method->set_native_function(entry, native_bind_event_is_interesting); 541 } else { 542 method->clear_native_function(); 543 } 544 if (log_is_enabled(Debug, jni, resolve)) { 545 ResourceMark rm(THREAD); 546 log_debug(jni, resolve)("[Registering JNI native method %s.%s]", 547 method->method_holder()->external_name(), 548 method->name()->as_C_string()); 549 } 550 return true; 551 } 552 553 bool Method::was_executed_more_than(int n) { 554 // Invocation counter is reset when the Method* is compiled. 555 // If the method has compiled code we therefore assume it has 556 // be executed more than n times. 557 if (is_accessor() || is_empty_method() || (code() != nullptr)) { 558 // interpreter doesn't bump invocation counter of trivial methods 559 // compiler does not bump invocation counter of compiled methods 560 return true; 561 } 562 else if ((method_counters() != nullptr && 563 method_counters()->invocation_counter()->carry()) || 564 (method_data() != nullptr && 565 method_data()->invocation_counter()->carry())) { 566 // The carry bit is set when the counter overflows and causes 567 // a compilation to occur. We don't know how many times 568 // the counter has been reset, so we simply assume it has 569 // been executed more than n times. 570 return true; 571 } else { 572 return invocation_count() > n; 573 } 574 } 575 576 void Method::print_invocation_count(outputStream* st) { 577 //---< compose+print method return type, klass, name, and signature >--- 578 if (is_static()) { st->print("static "); } 579 if (is_final()) { st->print("final "); } 580 if (is_synchronized()) { st->print("synchronized "); } 581 if (is_native()) { st->print("native "); } 582 st->print("%s::", method_holder()->external_name()); 583 name()->print_symbol_on(st); 584 signature()->print_symbol_on(st); 585 586 if (WizardMode) { 587 // dump the size of the byte codes 588 st->print(" {%d}", code_size()); 589 } 590 st->cr(); 591 592 // Counting based on signed int counters tends to overflow with 593 // longer-running workloads on fast machines. The counters under 594 // consideration here, however, are limited in range by counting 595 // logic. See InvocationCounter:count_limit for example. 596 // No "overflow precautions" need to be implemented here. 597 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count()); 598 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count()); 599 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count()); 600 601 if (method_data() != nullptr) { 602 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count()); 603 } 604 605 #ifndef PRODUCT 606 if (CountCompiledCalls) { 607 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count()); 608 } 609 #endif 610 } 611 612 MethodTrainingData* Method::training_data_or_null() const { 613 MethodCounters* mcs = method_counters(); 614 if (mcs == nullptr) { 615 return nullptr; 616 } else { 617 MethodTrainingData* mtd = mcs->method_training_data(); 618 if (mtd == mcs->method_training_data_sentinel()) { 619 return nullptr; 620 } 621 return mtd; 622 } 623 } 624 625 bool Method::init_training_data(MethodTrainingData* tdata) { 626 MethodCounters* mcs = method_counters(); 627 if (mcs == nullptr) { 628 return false; 629 } else { 630 return mcs->init_method_training_data(tdata); 631 } 632 } 633 634 bool Method::install_training_method_data(const methodHandle& method) { 635 MethodTrainingData* mtd = MethodTrainingData::find(method); 636 if (mtd != nullptr && mtd->has_holder() && mtd->final_profile() != nullptr && 637 mtd->holder() == method() && mtd->final_profile()->method() == method()) { // FIXME 638 Atomic::replace_if_null(&method->_method_data, mtd->final_profile()); 639 return true; 640 } 641 return false; 642 } 643 644 // Build a MethodData* object to hold profiling information collected on this 645 // method when requested. 646 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) { 647 if (install_training_method_data(method)) { 648 return; 649 } 650 // Do not profile the method if metaspace has hit an OOM previously 651 // allocating profiling data. Callers clear pending exception so don't 652 // add one here. 653 if (ClassLoaderDataGraph::has_metaspace_oom()) { 654 return; 655 } 656 657 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 658 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 659 if (HAS_PENDING_EXCEPTION) { 660 CompileBroker::log_metaspace_failure(); 661 ClassLoaderDataGraph::set_metaspace_oom(true); 662 return; // return the exception (which is cleared) 663 } 664 665 if (!Atomic::replace_if_null(&method->_method_data, method_data)) { 666 MetadataFactory::free_metadata(loader_data, method_data); 667 return; 668 } 669 670 /* 671 LogStreamHandle(Info, mdo) lsh; 672 if (lsh.is_enabled()) { 673 ResourceMark rm(THREAD); 674 lsh.print("build_profiling_method_data for "); 675 method->print_name(&lsh); 676 lsh.cr(); 677 } 678 */ 679 if (ForceProfiling && TrainingData::need_data()) { 680 MethodTrainingData* mtd = MethodTrainingData::make(method, false); 681 guarantee(mtd != nullptr, ""); 682 } 683 if (PrintMethodData) { 684 ResourceMark rm(THREAD); 685 tty->print("build_profiling_method_data for "); 686 method->print_name(tty); 687 tty->cr(); 688 // At the end of the run, the MDO, full of data, will be dumped. 689 } 690 } 691 692 MethodCounters* Method::build_method_counters(Thread* current, Method* m) { 693 // Do not profile the method if metaspace has hit an OOM previously 694 if (ClassLoaderDataGraph::has_metaspace_oom()) { 695 return nullptr; 696 } 697 698 methodHandle mh(current, m); 699 MethodCounters* counters; 700 if (current->is_Java_thread()) { 701 JavaThread* THREAD = JavaThread::cast(current); // For exception macros. 702 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold 703 // if needed. 704 counters = MethodCounters::allocate_with_exception(mh, THREAD); 705 if (HAS_PENDING_EXCEPTION) { 706 CLEAR_PENDING_EXCEPTION; 707 } 708 } else { 709 // Call metaspace allocation that doesn't throw exception if the 710 // current thread isn't a JavaThread, ie. the VMThread. 711 counters = MethodCounters::allocate_no_exception(mh); 712 } 713 714 if (counters == nullptr) { 715 CompileBroker::log_metaspace_failure(); 716 ClassLoaderDataGraph::set_metaspace_oom(true); 717 return nullptr; 718 } 719 720 if (!mh->init_method_counters(counters)) { 721 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 722 } 723 724 if (ForceProfiling && TrainingData::need_data()) { 725 MethodTrainingData* mtd = MethodTrainingData::make(mh, false); 726 guarantee(mtd != nullptr, ""); 727 } 728 729 return mh->method_counters(); 730 } 731 732 bool Method::init_method_counters(MethodCounters* counters) { 733 // Try to install a pointer to MethodCounters, return true on success. 734 return Atomic::replace_if_null(&_method_counters, counters); 735 } 736 737 void Method::set_exception_handler_entered(int handler_bci) { 738 if (ProfileExceptionHandlers) { 739 MethodData* mdo = method_data(); 740 if (mdo != nullptr) { 741 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci); 742 handler_data.set_exception_handler_entered(); 743 } 744 } 745 } 746 747 int Method::extra_stack_words() { 748 // not an inline function, to avoid a header dependency on Interpreter 749 return extra_stack_entries() * Interpreter::stackElementSize; 750 } 751 752 bool Method::compute_has_loops_flag() { 753 BytecodeStream bcs(methodHandle(Thread::current(), this)); 754 Bytecodes::Code bc; 755 756 while ((bc = bcs.next()) >= 0) { 757 switch (bc) { 758 case Bytecodes::_ifeq: 759 case Bytecodes::_ifnull: 760 case Bytecodes::_iflt: 761 case Bytecodes::_ifle: 762 case Bytecodes::_ifne: 763 case Bytecodes::_ifnonnull: 764 case Bytecodes::_ifgt: 765 case Bytecodes::_ifge: 766 case Bytecodes::_if_icmpeq: 767 case Bytecodes::_if_icmpne: 768 case Bytecodes::_if_icmplt: 769 case Bytecodes::_if_icmpgt: 770 case Bytecodes::_if_icmple: 771 case Bytecodes::_if_icmpge: 772 case Bytecodes::_if_acmpeq: 773 case Bytecodes::_if_acmpne: 774 case Bytecodes::_goto: 775 case Bytecodes::_jsr: 776 if (bcs.dest() < bcs.next_bci()) { 777 return set_has_loops(); 778 } 779 break; 780 781 case Bytecodes::_goto_w: 782 case Bytecodes::_jsr_w: 783 if (bcs.dest_w() < bcs.next_bci()) { 784 return set_has_loops(); 785 } 786 break; 787 788 case Bytecodes::_lookupswitch: { 789 Bytecode_lookupswitch lookupswitch(this, bcs.bcp()); 790 if (lookupswitch.default_offset() < 0) { 791 return set_has_loops(); 792 } else { 793 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) { 794 LookupswitchPair pair = lookupswitch.pair_at(i); 795 if (pair.offset() < 0) { 796 return set_has_loops(); 797 } 798 } 799 } 800 break; 801 } 802 case Bytecodes::_tableswitch: { 803 Bytecode_tableswitch tableswitch(this, bcs.bcp()); 804 if (tableswitch.default_offset() < 0) { 805 return set_has_loops(); 806 } else { 807 for (int i = 0; i < tableswitch.length(); ++i) { 808 if (tableswitch.dest_offset_at(i) < 0) { 809 return set_has_loops(); 810 } 811 } 812 } 813 break; 814 } 815 default: 816 break; 817 } 818 } 819 820 _flags.set_has_loops_flag_init(true); 821 return false; 822 } 823 824 bool Method::is_final_method(AccessFlags class_access_flags) const { 825 // or "does_not_require_vtable_entry" 826 // default method or overpass can occur, is not final (reuses vtable entry) 827 // private methods in classes get vtable entries for backward class compatibility. 828 if (is_overpass() || is_default_method()) return false; 829 return is_final() || class_access_flags.is_final(); 830 } 831 832 bool Method::is_final_method() const { 833 return is_final_method(method_holder()->access_flags()); 834 } 835 836 bool Method::is_default_method() const { 837 if (method_holder() != nullptr && 838 method_holder()->is_interface() && 839 !is_abstract() && !is_private()) { 840 return true; 841 } else { 842 return false; 843 } 844 } 845 846 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 847 if (is_final_method(class_access_flags)) return true; 848 #ifdef ASSERT 849 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 850 if (class_access_flags.is_interface()) { 851 ResourceMark rm; 852 assert(is_nonv == is_static() || is_nonv == is_private(), 853 "nonvirtual unexpected for non-static, non-private: %s", 854 name_and_sig_as_C_string()); 855 } 856 #endif 857 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 858 return vtable_index() == nonvirtual_vtable_index; 859 } 860 861 bool Method::can_be_statically_bound() const { 862 return can_be_statically_bound(method_holder()->access_flags()); 863 } 864 865 bool Method::can_be_statically_bound(InstanceKlass* context) const { 866 return (method_holder() == context) && can_be_statically_bound(); 867 } 868 869 /** 870 * Returns false if this is one of specially treated methods for 871 * which we have to provide stack trace in throw in compiled code. 872 * Returns true otherwise. 873 */ 874 bool Method::can_omit_stack_trace() { 875 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) { 876 return false; // All methods in sun.invoke.util.ValueConversions 877 } 878 return true; 879 } 880 881 bool Method::is_accessor() const { 882 return is_getter() || is_setter(); 883 } 884 885 bool Method::is_getter() const { 886 if (code_size() != 5) return false; 887 if (size_of_parameters() != 1) return false; 888 if (java_code_at(0) != Bytecodes::_aload_0) return false; 889 if (java_code_at(1) != Bytecodes::_getfield) return false; 890 switch (java_code_at(4)) { 891 case Bytecodes::_ireturn: 892 case Bytecodes::_lreturn: 893 case Bytecodes::_freturn: 894 case Bytecodes::_dreturn: 895 case Bytecodes::_areturn: 896 break; 897 default: 898 return false; 899 } 900 return true; 901 } 902 903 bool Method::is_setter() const { 904 if (code_size() != 6) return false; 905 if (java_code_at(0) != Bytecodes::_aload_0) return false; 906 switch (java_code_at(1)) { 907 case Bytecodes::_iload_1: 908 case Bytecodes::_aload_1: 909 case Bytecodes::_fload_1: 910 if (size_of_parameters() != 2) return false; 911 break; 912 case Bytecodes::_dload_1: 913 case Bytecodes::_lload_1: 914 if (size_of_parameters() != 3) return false; 915 break; 916 default: 917 return false; 918 } 919 if (java_code_at(2) != Bytecodes::_putfield) return false; 920 if (java_code_at(5) != Bytecodes::_return) return false; 921 return true; 922 } 923 924 bool Method::is_constant_getter() const { 925 int last_index = code_size() - 1; 926 // Check if the first 1-3 bytecodes are a constant push 927 // and the last bytecode is a return. 928 return (2 <= code_size() && code_size() <= 4 && 929 Bytecodes::is_const(java_code_at(0)) && 930 Bytecodes::length_for(java_code_at(0)) == last_index && 931 Bytecodes::is_return(java_code_at(last_index))); 932 } 933 934 bool Method::has_valid_initializer_flags() const { 935 return (is_static() || 936 method_holder()->major_version() < 51); 937 } 938 939 bool Method::is_static_initializer() const { 940 // For classfiles version 51 or greater, ensure that the clinit method is 941 // static. Non-static methods with the name "<clinit>" are not static 942 // initializers. (older classfiles exempted for backward compatibility) 943 return name() == vmSymbols::class_initializer_name() && 944 has_valid_initializer_flags(); 945 } 946 947 bool Method::is_object_initializer() const { 948 return name() == vmSymbols::object_initializer_name(); 949 } 950 951 bool Method::needs_clinit_barrier() const { 952 return is_static() && !method_holder()->is_initialized(); 953 } 954 955 bool Method::code_has_clinit_barriers() const { 956 nmethod* nm = code(); 957 return (nm != nullptr) && nm->has_clinit_barriers(); 958 } 959 960 bool Method::is_object_wait0() const { 961 return klass_name() == vmSymbols::java_lang_Object() 962 && name() == vmSymbols::wait_name(); 963 } 964 965 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 966 int length = method->checked_exceptions_length(); 967 if (length == 0) { // common case 968 return objArrayHandle(THREAD, Universe::the_empty_class_array()); 969 } else { 970 methodHandle h_this(THREAD, method); 971 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle())); 972 objArrayHandle mirrors (THREAD, m_oop); 973 for (int i = 0; i < length; i++) { 974 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 975 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 976 if (log_is_enabled(Warning, exceptions) && 977 !k->is_subclass_of(vmClasses::Throwable_klass())) { 978 ResourceMark rm(THREAD); 979 log_warning(exceptions)( 980 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable", 981 k->external_name(), method->external_name()); 982 } 983 mirrors->obj_at_put(i, k->java_mirror()); 984 } 985 return mirrors; 986 } 987 }; 988 989 990 int Method::line_number_from_bci(int bci) const { 991 int best_bci = 0; 992 int best_line = -1; 993 if (bci == SynchronizationEntryBCI) bci = 0; 994 if (0 <= bci && bci < code_size() && has_linenumber_table()) { 995 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 996 // Not necessarily sorted and not necessarily one-to-one. 997 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 998 while (stream.read_pair()) { 999 if (stream.bci() == bci) { 1000 // perfect match 1001 return stream.line(); 1002 } else { 1003 // update best_bci/line 1004 if (stream.bci() < bci && stream.bci() >= best_bci) { 1005 best_bci = stream.bci(); 1006 best_line = stream.line(); 1007 } 1008 } 1009 } 1010 } 1011 return best_line; 1012 } 1013 1014 1015 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 1016 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 1017 Thread *thread = Thread::current(); 1018 Symbol* klass_name = constants()->klass_name_at(klass_index); 1019 Handle loader(thread, method_holder()->class_loader()); 1020 return SystemDictionary::find_instance_klass(thread, klass_name, loader) != nullptr; 1021 } else { 1022 return true; 1023 } 1024 } 1025 1026 1027 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const { 1028 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc); 1029 if (must_be_resolved) { 1030 // Make sure klass is resolved in constantpool. 1031 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 1032 } 1033 return is_klass_loaded_by_klass_index(klass_index); 1034 } 1035 1036 1037 void Method::set_native_function(address function, bool post_event_flag) { 1038 assert(function != nullptr, "use clear_native_function to unregister natives"); 1039 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 1040 address* native_function = native_function_addr(); 1041 1042 // We can see racers trying to place the same native function into place. Once 1043 // is plenty. 1044 address current = *native_function; 1045 if (current == function) return; 1046 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 1047 function != nullptr) { 1048 // native_method_throw_unsatisfied_link_error_entry() should only 1049 // be passed when post_event_flag is false. 1050 assert(function != 1051 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1052 "post_event_flag mismatch"); 1053 1054 // post the bind event, and possible change the bind function 1055 JvmtiExport::post_native_method_bind(this, &function); 1056 } 1057 *native_function = function; 1058 // This function can be called more than once. We must make sure that we always 1059 // use the latest registered method -> check if a stub already has been generated. 1060 // If so, we have to make it not_entrant. 1061 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 1062 if (nm != nullptr) { 1063 nm->make_not_entrant(); 1064 } 1065 } 1066 1067 1068 bool Method::has_native_function() const { 1069 if (is_special_native_intrinsic()) 1070 return false; // special-cased in SharedRuntime::generate_native_wrapper 1071 address func = native_function(); 1072 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 1073 } 1074 1075 1076 void Method::clear_native_function() { 1077 // Note: is_method_handle_intrinsic() is allowed here. 1078 set_native_function( 1079 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1080 !native_bind_event_is_interesting); 1081 this->unlink_code(); 1082 } 1083 1084 1085 void Method::set_signature_handler(address handler) { 1086 address* signature_handler = signature_handler_addr(); 1087 *signature_handler = handler; 1088 } 1089 1090 1091 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 1092 assert(reason != nullptr, "must provide a reason"); 1093 if (PrintCompilation && report) { 1094 ttyLocker ttyl; 1095 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 1096 if (comp_level == CompLevel_all) { 1097 tty->print("all levels "); 1098 } else { 1099 tty->print("level %d ", comp_level); 1100 } 1101 this->print_short_name(tty); 1102 int size = this->code_size(); 1103 if (size > 0) { 1104 tty->print(" (%d bytes)", size); 1105 } 1106 if (reason != nullptr) { 1107 tty->print(" %s", reason); 1108 } 1109 tty->cr(); 1110 } 1111 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) { 1112 ttyLocker ttyl; 1113 xtty->begin_elem("make_not_compilable thread='%zu' osr='%d' level='%d'", 1114 os::current_thread_id(), is_osr, comp_level); 1115 if (reason != nullptr) { 1116 xtty->print(" reason=\'%s\'", reason); 1117 } 1118 xtty->method(this); 1119 xtty->stamp(); 1120 xtty->end_elem(); 1121 } 1122 } 1123 1124 bool Method::is_always_compilable() const { 1125 // Generated adapters must be compiled 1126 if (is_special_native_intrinsic() && is_synthetic()) { 1127 assert(!is_not_c1_compilable(), "sanity check"); 1128 assert(!is_not_c2_compilable(), "sanity check"); 1129 return true; 1130 } 1131 1132 return false; 1133 } 1134 1135 bool Method::is_not_compilable(int comp_level) const { 1136 if (number_of_breakpoints() > 0) 1137 return true; 1138 if (is_always_compilable()) 1139 return false; 1140 if (comp_level == CompLevel_any) 1141 return is_not_c1_compilable() && is_not_c2_compilable(); 1142 if (is_c1_compile(comp_level)) 1143 return is_not_c1_compilable(); 1144 if (is_c2_compile(comp_level)) 1145 return is_not_c2_compilable(); 1146 return false; 1147 } 1148 1149 // call this when compiler finds that this method is not compilable 1150 void Method::set_not_compilable(const char* reason, int comp_level, bool report) { 1151 if (is_always_compilable()) { 1152 // Don't mark a method which should be always compilable 1153 return; 1154 } 1155 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 1156 if (comp_level == CompLevel_all) { 1157 set_is_not_c1_compilable(); 1158 set_is_not_c2_compilable(); 1159 } else { 1160 if (is_c1_compile(comp_level)) 1161 set_is_not_c1_compilable(); 1162 if (is_c2_compile(comp_level)) 1163 set_is_not_c2_compilable(); 1164 } 1165 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check"); 1166 } 1167 1168 bool Method::is_not_osr_compilable(int comp_level) const { 1169 if (is_not_compilable(comp_level)) 1170 return true; 1171 if (comp_level == CompLevel_any) 1172 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable(); 1173 if (is_c1_compile(comp_level)) 1174 return is_not_c1_osr_compilable(); 1175 if (is_c2_compile(comp_level)) 1176 return is_not_c2_osr_compilable(); 1177 return false; 1178 } 1179 1180 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) { 1181 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 1182 if (comp_level == CompLevel_all) { 1183 set_is_not_c1_osr_compilable(); 1184 set_is_not_c2_osr_compilable(); 1185 } else { 1186 if (is_c1_compile(comp_level)) 1187 set_is_not_c1_osr_compilable(); 1188 if (is_c2_compile(comp_level)) 1189 set_is_not_c2_osr_compilable(); 1190 } 1191 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check"); 1192 } 1193 1194 // Revert to using the interpreter and clear out the nmethod 1195 void Method::clear_code() { 1196 // this may be null if c2i adapters have not been made yet 1197 // Only should happen at allocate time. 1198 if (adapter() == nullptr) { 1199 _from_compiled_entry = nullptr; 1200 } else { 1201 _from_compiled_entry = adapter()->get_c2i_entry(); 1202 } 1203 OrderAccess::storestore(); 1204 _from_interpreted_entry = _i2i_entry; 1205 OrderAccess::storestore(); 1206 _code = nullptr; 1207 } 1208 1209 void Method::unlink_code(nmethod *compare) { 1210 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag); 1211 // We need to check if either the _code or _from_compiled_code_entry_point 1212 // refer to this nmethod because there is a race in setting these two fields 1213 // in Method* as seen in bugid 4947125. 1214 if (code() == compare || 1215 from_compiled_entry() == compare->verified_entry_point()) { 1216 clear_code(); 1217 } 1218 } 1219 1220 void Method::unlink_code() { 1221 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag); 1222 clear_code(); 1223 } 1224 1225 #if INCLUDE_CDS 1226 // Called by class data sharing to remove any entry points (which are not shared) 1227 void Method::unlink_method() { 1228 assert(CDSConfig::is_dumping_archive(), "sanity"); 1229 _code = nullptr; 1230 if (!CDSConfig::is_dumping_adapters() || AdapterHandlerLibrary::is_abstract_method_adapter(_adapter)) { 1231 _adapter = nullptr; 1232 } 1233 _i2i_entry = nullptr; 1234 _from_compiled_entry = nullptr; 1235 _from_interpreted_entry = nullptr; 1236 1237 if (is_native()) { 1238 *native_function_addr() = nullptr; 1239 set_signature_handler(nullptr); 1240 } 1241 NOT_PRODUCT(set_compiled_invocation_count(0);) 1242 1243 clear_method_data(); 1244 clear_method_counters(); 1245 clear_is_not_c1_compilable(); 1246 clear_is_not_c1_osr_compilable(); 1247 clear_is_not_c2_compilable(); 1248 clear_is_not_c2_osr_compilable(); 1249 clear_queued_for_compilation(); 1250 set_pending_queue_processed(false); 1251 remove_unshareable_flags(); 1252 } 1253 1254 void Method::remove_unshareable_flags() { 1255 // clear all the flags that shouldn't be in the archived version 1256 assert(!is_old(), "must be"); 1257 assert(!is_obsolete(), "must be"); 1258 assert(!is_deleted(), "must be"); 1259 1260 set_is_prefixed_native(false); 1261 set_queued_for_compilation(false); 1262 set_pending_queue_processed(false); 1263 set_is_not_c2_compilable(false); 1264 set_is_not_c1_compilable(false); 1265 set_is_not_c2_osr_compilable(false); 1266 set_on_stack_flag(false); 1267 set_has_upcall_on_method_entry(false); 1268 set_has_upcall_on_method_exit(false); 1269 } 1270 #endif 1271 1272 // Called when the method_holder is getting linked. Setup entrypoints so the method 1273 // is ready to be called from interpreter, compiler, and vtables. 1274 void Method::link_method(const methodHandle& h_method, TRAPS) { 1275 if (log_is_enabled(Info, perf, class, link)) { 1276 ClassLoader::perf_ik_link_methods_count()->inc(); 1277 } 1278 1279 // If the code cache is full, we may reenter this function for the 1280 // leftover methods that weren't linked. 1281 if (adapter() != nullptr && !adapter()->is_shared()) { 1282 return; 1283 } 1284 assert( _code == nullptr, "nothing compiled yet" ); 1285 1286 // Setup interpreter entrypoint 1287 assert(this == h_method(), "wrong h_method()" ); 1288 1289 assert(adapter() == nullptr || adapter()->is_linked(), "init'd to null or restored from cache"); 1290 address entry = Interpreter::entry_for_method(h_method); 1291 assert(entry != nullptr, "interpreter entry must be non-null"); 1292 // Sets both _i2i_entry and _from_interpreted_entry 1293 set_interpreter_entry(entry); 1294 1295 // Don't overwrite already registered native entries. 1296 if (is_native() && !has_native_function()) { 1297 set_native_function( 1298 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1299 !native_bind_event_is_interesting); 1300 } 1301 1302 // Setup compiler entrypoint. This is made eagerly, so we do not need 1303 // special handling of vtables. An alternative is to make adapters more 1304 // lazily by calling make_adapter() from from_compiled_entry() for the 1305 // normal calls. For vtable calls life gets more complicated. When a 1306 // call-site goes mega-morphic we need adapters in all methods which can be 1307 // called from the vtable. We need adapters on such methods that get loaded 1308 // later. Ditto for mega-morphic itable calls. If this proves to be a 1309 // problem we'll make these lazily later. 1310 if (_adapter == nullptr) { 1311 (void) make_adapters(h_method, CHECK); 1312 } 1313 1314 // ONLY USE the h_method now as make_adapter may have blocked 1315 1316 if (h_method->is_continuation_native_intrinsic()) { 1317 _from_interpreted_entry = nullptr; 1318 _from_compiled_entry = nullptr; 1319 _i2i_entry = nullptr; 1320 if (Continuations::enabled()) { 1321 assert(!Threads::is_vm_complete(), "should only be called during vm init"); 1322 AdapterHandlerLibrary::create_native_wrapper(h_method); 1323 if (!h_method->has_compiled_code()) { 1324 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small"); 1325 } 1326 assert(_from_interpreted_entry == get_i2c_entry(), "invariant"); 1327 } 1328 } 1329 if (_preload_code != nullptr) { 1330 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag); 1331 set_code(h_method, _preload_code); 1332 assert(((nmethod*)_preload_code)->scc_entry() == _scc_entry, "sanity"); 1333 } 1334 } 1335 1336 address Method::make_adapters(const methodHandle& mh, TRAPS) { 1337 PerfTraceElapsedTime timer(ClassLoader::perf_method_adapters_time()); 1338 1339 // Adapters for compiled code are made eagerly here. They are fairly 1340 // small (generally < 100 bytes) and quick to make (and cached and shared) 1341 // so making them eagerly shouldn't be too expensive. 1342 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1343 if (adapter == nullptr ) { 1344 if (!is_init_completed()) { 1345 // Don't throw exceptions during VM initialization because java.lang.* classes 1346 // might not have been initialized, causing problems when constructing the 1347 // Java exception object. 1348 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1349 } else { 1350 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters"); 1351 } 1352 } 1353 1354 mh->set_adapter_entry(adapter); 1355 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1356 return adapter->get_c2i_entry(); 1357 } 1358 1359 // The verified_code_entry() must be called when a invoke is resolved 1360 // on this method. 1361 1362 // It returns the compiled code entry point, after asserting not null. 1363 // This function is called after potential safepoints so that nmethod 1364 // or adapter that it points to is still live and valid. 1365 // This function must not hit a safepoint! 1366 address Method::verified_code_entry() { 1367 debug_only(NoSafepointVerifier nsv;) 1368 assert(_from_compiled_entry != nullptr, "must be set"); 1369 return _from_compiled_entry; 1370 } 1371 1372 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1373 // (could be racing a deopt). 1374 // Not inline to avoid circular ref. 1375 bool Method::check_code() const { 1376 // cached in a register or local. There's a race on the value of the field. 1377 nmethod *code = Atomic::load_acquire(&_code); 1378 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method()); 1379 } 1380 1381 // Install compiled code. Instantly it can execute. 1382 void Method::set_code(const methodHandle& mh, nmethod *code) { 1383 assert_lock_strong(NMethodState_lock); 1384 assert( code, "use clear_code to remove code" ); 1385 assert( mh->check_code(), "" ); 1386 1387 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!"); 1388 1389 // These writes must happen in this order, because the interpreter will 1390 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1391 // which jumps to _from_compiled_entry. 1392 mh->_code = code; // Assign before allowing compiled code to exec 1393 1394 int comp_level = code->comp_level(); 1395 // In theory there could be a race here. In practice it is unlikely 1396 // and not worth worrying about. 1397 if (comp_level > mh->highest_comp_level()) { 1398 mh->set_highest_comp_level(comp_level); 1399 } 1400 1401 OrderAccess::storestore(); 1402 mh->_from_compiled_entry = code->verified_entry_point(); 1403 OrderAccess::storestore(); 1404 1405 if (mh->is_continuation_native_intrinsic()) { 1406 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method 1407 1408 if (mh->is_continuation_enter_intrinsic()) { 1409 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted 1410 mh->_i2i_entry = ContinuationEntry::interpreted_entry(); 1411 } else if (mh->is_continuation_yield_intrinsic()) { 1412 mh->_i2i_entry = mh->get_i2c_entry(); 1413 } else { 1414 guarantee(false, "Unknown Continuation native intrinsic"); 1415 } 1416 // This must come last, as it is what's tested in LinkResolver::resolve_static_call 1417 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry()); 1418 } else if (!mh->is_method_handle_intrinsic()) { 1419 // Instantly compiled code can execute. 1420 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1421 } 1422 } 1423 1424 1425 bool Method::is_overridden_in(Klass* k) const { 1426 InstanceKlass* ik = InstanceKlass::cast(k); 1427 1428 if (ik->is_interface()) return false; 1429 1430 // If method is an interface, we skip it - except if it 1431 // is a miranda method 1432 if (method_holder()->is_interface()) { 1433 // Check that method is not a miranda method 1434 if (ik->lookup_method(name(), signature()) == nullptr) { 1435 // No implementation exist - so miranda method 1436 return false; 1437 } 1438 return true; 1439 } 1440 1441 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1442 if (!has_vtable_index()) { 1443 return false; 1444 } else { 1445 Method* vt_m = ik->method_at_vtable(vtable_index()); 1446 return vt_m != this; 1447 } 1448 } 1449 1450 1451 // give advice about whether this Method* should be cached or not 1452 bool Method::should_not_be_cached() const { 1453 if (is_old()) { 1454 // This method has been redefined. It is either EMCP or obsolete 1455 // and we don't want to cache it because that would pin the method 1456 // down and prevent it from being collectible if and when it 1457 // finishes executing. 1458 return true; 1459 } 1460 1461 // caching this method should be just fine 1462 return false; 1463 } 1464 1465 1466 /** 1467 * Returns true if this is one of the specially treated methods for 1468 * security related stack walks (like Reflection.getCallerClass). 1469 */ 1470 bool Method::is_ignored_by_security_stack_walk() const { 1471 if (intrinsic_id() == vmIntrinsics::_invoke) { 1472 // This is Method.invoke() -- ignore it 1473 return true; 1474 } 1475 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) { 1476 // This is an auxiliary frame -- ignore it 1477 return true; 1478 } 1479 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1480 // This is an internal adapter frame for method handles -- ignore it 1481 return true; 1482 } 1483 return false; 1484 } 1485 1486 1487 // Constant pool structure for invoke methods: 1488 enum { 1489 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1490 _imcp_invoke_signature, // utf8: (variable Symbol*) 1491 _imcp_limit 1492 }; 1493 1494 // Test if this method is an MH adapter frame generated by Java code. 1495 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1496 bool Method::is_compiled_lambda_form() const { 1497 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1498 } 1499 1500 // Test if this method is an internal MH primitive method. 1501 bool Method::is_method_handle_intrinsic() const { 1502 vmIntrinsics::ID iid = intrinsic_id(); 1503 return (MethodHandles::is_signature_polymorphic(iid) && 1504 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1505 } 1506 1507 bool Method::has_member_arg() const { 1508 vmIntrinsics::ID iid = intrinsic_id(); 1509 return (MethodHandles::is_signature_polymorphic(iid) && 1510 MethodHandles::has_member_arg(iid)); 1511 } 1512 1513 // Make an instance of a signature-polymorphic internal MH primitive. 1514 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1515 Symbol* signature, 1516 TRAPS) { 1517 ResourceMark rm(THREAD); 1518 methodHandle empty; 1519 1520 InstanceKlass* holder = vmClasses::MethodHandle_klass(); 1521 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1522 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1523 1524 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1525 1526 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1527 name->increment_refcount(); 1528 signature->increment_refcount(); 1529 1530 int cp_length = _imcp_limit; 1531 ClassLoaderData* loader_data = holder->class_loader_data(); 1532 constantPoolHandle cp; 1533 { 1534 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1535 cp = constantPoolHandle(THREAD, cp_oop); 1536 } 1537 cp->copy_fields(holder->constants()); 1538 cp->set_pool_holder(holder); 1539 cp->symbol_at_put(_imcp_invoke_name, name); 1540 cp->symbol_at_put(_imcp_invoke_signature, signature); 1541 cp->set_has_preresolution(); 1542 cp->set_is_for_method_handle_intrinsic(); 1543 1544 // decide on access bits: public or not? 1545 u2 flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1546 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1547 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1548 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1549 1550 methodHandle m; 1551 { 1552 InlineTableSizes sizes; 1553 Method* m_oop = Method::allocate(loader_data, 0, 1554 accessFlags_from(flags_bits), &sizes, 1555 ConstMethod::NORMAL, 1556 name, 1557 CHECK_(empty)); 1558 m = methodHandle(THREAD, m_oop); 1559 } 1560 m->set_constants(cp()); 1561 m->set_name_index(_imcp_invoke_name); 1562 m->set_signature_index(_imcp_invoke_signature); 1563 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1564 assert(m->signature() == signature, ""); 1565 m->constMethod()->compute_from_signature(signature, must_be_static); 1566 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder())); 1567 assert(m->is_method_handle_intrinsic(), ""); 1568 #ifdef ASSERT 1569 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1570 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1571 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1572 #endif //ASSERT 1573 1574 // Finally, set up its entry points. 1575 assert(m->can_be_statically_bound(), ""); 1576 m->set_vtable_index(Method::nonvirtual_vtable_index); 1577 m->link_method(m, CHECK_(empty)); 1578 1579 if (iid == vmIntrinsics::_linkToNative) { 1580 m->set_interpreter_entry(m->adapter()->get_i2c_entry()); 1581 } 1582 if (log_is_enabled(Debug, methodhandles)) { 1583 LogTarget(Debug, methodhandles) lt; 1584 LogStream ls(lt); 1585 m->print_on(&ls); 1586 } 1587 1588 return m; 1589 } 1590 1591 #if INCLUDE_CDS 1592 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) { 1593 m->restore_adapter(CHECK); 1594 if (m->adapter() != nullptr) { 1595 m->adapter()->restore_unshareable_info(CHECK); 1596 m->set_from_compiled_entry(m->adapter()->get_c2i_entry()); 1597 } 1598 m->link_method(m, CHECK); 1599 1600 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) { 1601 m->set_interpreter_entry(m->adapter()->get_i2c_entry()); 1602 } 1603 } 1604 #endif 1605 1606 Klass* Method::check_non_bcp_klass(Klass* klass) { 1607 if (klass != nullptr && klass->class_loader() != nullptr) { 1608 if (klass->is_objArray_klass()) 1609 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1610 return klass; 1611 } 1612 return nullptr; 1613 } 1614 1615 1616 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, 1617 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1618 // Code below does not work for native methods - they should never get rewritten anyway 1619 assert(!m->is_native(), "cannot rewrite native methods"); 1620 // Allocate new Method* 1621 AccessFlags flags = m->access_flags(); 1622 1623 ConstMethod* cm = m->constMethod(); 1624 int checked_exceptions_len = cm->checked_exceptions_length(); 1625 int localvariable_len = cm->localvariable_table_length(); 1626 int exception_table_len = cm->exception_table_length(); 1627 int method_parameters_len = cm->method_parameters_length(); 1628 int method_annotations_len = cm->method_annotations_length(); 1629 int parameter_annotations_len = cm->parameter_annotations_length(); 1630 int type_annotations_len = cm->type_annotations_length(); 1631 int default_annotations_len = cm->default_annotations_length(); 1632 1633 InlineTableSizes sizes( 1634 localvariable_len, 1635 new_compressed_linenumber_size, 1636 exception_table_len, 1637 checked_exceptions_len, 1638 method_parameters_len, 1639 cm->generic_signature_index(), 1640 method_annotations_len, 1641 parameter_annotations_len, 1642 type_annotations_len, 1643 default_annotations_len, 1644 0); 1645 1646 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1647 Method* newm_oop = Method::allocate(loader_data, 1648 new_code_length, 1649 flags, 1650 &sizes, 1651 m->method_type(), 1652 m->name(), 1653 CHECK_(methodHandle())); 1654 methodHandle newm (THREAD, newm_oop); 1655 1656 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1657 ConstMethod* newcm = newm->constMethod(); 1658 int new_const_method_size = newm->constMethod()->size(); 1659 1660 // This works because the source and target are both Methods. Some compilers 1661 // (e.g., clang) complain that the target vtable pointer will be stomped, 1662 // so cast away newm()'s and m()'s Methodness. 1663 memcpy((void*)newm(), (void*)m(), sizeof(Method)); 1664 1665 // Create shallow copy of ConstMethod. 1666 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1667 1668 // Reset correct method/const method, method size, and parameter info 1669 newm->set_constMethod(newcm); 1670 newm->constMethod()->set_code_size(new_code_length); 1671 newm->constMethod()->set_constMethod_size(new_const_method_size); 1672 assert(newm->code_size() == new_code_length, "check"); 1673 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1674 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1675 assert(newm->exception_table_length() == exception_table_len, "check"); 1676 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1677 // Copy new byte codes 1678 memcpy(newm->code_base(), new_code, new_code_length); 1679 // Copy line number table 1680 if (new_compressed_linenumber_size > 0) { 1681 memcpy(newm->compressed_linenumber_table(), 1682 new_compressed_linenumber_table, 1683 new_compressed_linenumber_size); 1684 } 1685 // Copy method_parameters 1686 if (method_parameters_len > 0) { 1687 memcpy(newm->method_parameters_start(), 1688 m->method_parameters_start(), 1689 method_parameters_len * sizeof(MethodParametersElement)); 1690 } 1691 // Copy checked_exceptions 1692 if (checked_exceptions_len > 0) { 1693 memcpy(newm->checked_exceptions_start(), 1694 m->checked_exceptions_start(), 1695 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1696 } 1697 // Copy exception table 1698 if (exception_table_len > 0) { 1699 memcpy(newm->exception_table_start(), 1700 m->exception_table_start(), 1701 exception_table_len * sizeof(ExceptionTableElement)); 1702 } 1703 // Copy local variable number table 1704 if (localvariable_len > 0) { 1705 memcpy(newm->localvariable_table_start(), 1706 m->localvariable_table_start(), 1707 localvariable_len * sizeof(LocalVariableTableElement)); 1708 } 1709 // Copy stackmap table 1710 if (m->has_stackmap_table()) { 1711 int code_attribute_length = m->stackmap_data()->length(); 1712 Array<u1>* stackmap_data = 1713 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle())); 1714 memcpy((void*)stackmap_data->adr_at(0), 1715 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1716 newm->set_stackmap_data(stackmap_data); 1717 } 1718 1719 // copy annotations over to new method 1720 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle())); 1721 return newm; 1722 } 1723 1724 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) { 1725 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics 1726 // because we are not loading from core libraries 1727 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1728 // which does not use the class default class loader so we check for its loader here 1729 const InstanceKlass* ik = InstanceKlass::cast(holder); 1730 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1731 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here 1732 } 1733 1734 // see if the klass name is well-known: 1735 Symbol* klass_name = ik->name(); 1736 vmSymbolID id = vmSymbols::find_sid(klass_name); 1737 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) { 1738 return id; 1739 } else { 1740 return vmSymbolID::NO_SID; 1741 } 1742 } 1743 1744 void Method::init_intrinsic_id(vmSymbolID klass_id) { 1745 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once"); 1746 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1747 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1748 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1749 1750 // the klass name is well-known: 1751 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be"); 1752 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility"); 1753 1754 // ditto for method and signature: 1755 vmSymbolID name_id = vmSymbols::find_sid(name()); 1756 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1757 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1758 && name_id == vmSymbolID::NO_SID) { 1759 return; 1760 } 1761 vmSymbolID sig_id = vmSymbols::find_sid(signature()); 1762 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1763 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1764 && sig_id == vmSymbolID::NO_SID) { 1765 return; 1766 } 1767 1768 u2 flags = access_flags().as_method_flags(); 1769 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1770 if (id != vmIntrinsics::_none) { 1771 set_intrinsic_id(id); 1772 if (id == vmIntrinsics::_Class_cast) { 1773 // Even if the intrinsic is rejected, we want to inline this simple method. 1774 set_force_inline(); 1775 } 1776 return; 1777 } 1778 1779 // A few slightly irregular cases: 1780 switch (klass_id) { 1781 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1782 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1783 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1784 if (!is_native()) break; 1785 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1786 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1787 id = vmIntrinsics::_none; 1788 break; 1789 1790 default: 1791 break; 1792 } 1793 1794 if (id != vmIntrinsics::_none) { 1795 // Set up its iid. It is an alias method. 1796 set_intrinsic_id(id); 1797 return; 1798 } 1799 } 1800 1801 bool Method::load_signature_classes(const methodHandle& m, TRAPS) { 1802 if (!THREAD->can_call_java()) { 1803 // There is nothing useful this routine can do from within the Compile thread. 1804 // Hopefully, the signature contains only well-known classes. 1805 // We could scan for this and return true/false, but the caller won't care. 1806 return false; 1807 } 1808 bool sig_is_loaded = true; 1809 ResourceMark rm(THREAD); 1810 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) { 1811 if (ss.is_reference()) { 1812 // load everything, including arrays "[Lfoo;" 1813 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD); 1814 // We are loading classes eagerly. If a ClassNotFoundException or 1815 // a LinkageError was generated, be sure to ignore it. 1816 if (HAS_PENDING_EXCEPTION) { 1817 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) || 1818 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) { 1819 CLEAR_PENDING_EXCEPTION; 1820 } else { 1821 return false; 1822 } 1823 } 1824 if( klass == nullptr) { sig_is_loaded = false; } 1825 } 1826 } 1827 return sig_is_loaded; 1828 } 1829 1830 // Exposed so field engineers can debug VM 1831 void Method::print_short_name(outputStream* st) const { 1832 ResourceMark rm; 1833 #ifdef PRODUCT 1834 st->print(" %s::", method_holder()->external_name()); 1835 #else 1836 st->print(" %s::", method_holder()->internal_name()); 1837 #endif 1838 name()->print_symbol_on(st); 1839 if (WizardMode) signature()->print_symbol_on(st); 1840 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1841 MethodHandles::print_as_basic_type_signature_on(st, signature()); 1842 } 1843 1844 // Comparer for sorting an object array containing 1845 // Method*s. 1846 static int method_comparator(Method* a, Method* b) { 1847 return a->name()->fast_compare(b->name()); 1848 } 1849 1850 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1851 // default_methods also uses this without the ordering for fast find_method 1852 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) { 1853 int length = methods->length(); 1854 if (length > 1) { 1855 if (func == nullptr) { 1856 func = method_comparator; 1857 } 1858 { 1859 NoSafepointVerifier nsv; 1860 QuickSort::sort(methods->data(), length, func); 1861 } 1862 // Reset method ordering 1863 if (set_idnums) { 1864 for (u2 i = 0; i < length; i++) { 1865 Method* m = methods->at(i); 1866 m->set_method_idnum(i); 1867 m->set_orig_method_idnum(i); 1868 } 1869 } 1870 } 1871 } 1872 1873 //----------------------------------------------------------------------------------- 1874 // Non-product code unless JVM/TI needs it 1875 1876 #if !defined(PRODUCT) || INCLUDE_JVMTI 1877 class SignatureTypePrinter : public SignatureTypeNames { 1878 private: 1879 outputStream* _st; 1880 bool _use_separator; 1881 1882 void type_name(const char* name) { 1883 if (_use_separator) _st->print(", "); 1884 _st->print("%s", name); 1885 _use_separator = true; 1886 } 1887 1888 public: 1889 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1890 _st = st; 1891 _use_separator = false; 1892 } 1893 1894 void print_parameters() { _use_separator = false; do_parameters_on(this); } 1895 void print_returntype() { _use_separator = false; do_type(return_type()); } 1896 }; 1897 1898 1899 void Method::print_name(outputStream* st) const { 1900 Thread *thread = Thread::current(); 1901 ResourceMark rm(thread); 1902 st->print("%s ", is_static() ? "static" : "virtual"); 1903 if (WizardMode) { 1904 st->print("%s.", method_holder()->internal_name()); 1905 name()->print_symbol_on(st); 1906 signature()->print_symbol_on(st); 1907 } else { 1908 SignatureTypePrinter sig(signature(), st); 1909 sig.print_returntype(); 1910 st->print(" %s.", method_holder()->internal_name()); 1911 name()->print_symbol_on(st); 1912 st->print("("); 1913 sig.print_parameters(); 1914 st->print(")"); 1915 } 1916 } 1917 #endif // !PRODUCT || INCLUDE_JVMTI 1918 1919 1920 void Method::print_codes_on(outputStream* st, int flags) const { 1921 print_codes_on(0, code_size(), st, flags); 1922 } 1923 1924 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const { 1925 Thread *thread = Thread::current(); 1926 ResourceMark rm(thread); 1927 methodHandle mh (thread, (Method*)this); 1928 BytecodeTracer::print_method_codes(mh, from, to, st, flags); 1929 } 1930 1931 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1932 _bci = 0; 1933 _line = 0; 1934 }; 1935 1936 bool CompressedLineNumberReadStream::read_pair() { 1937 jubyte next = read_byte(); 1938 // Check for terminator 1939 if (next == 0) return false; 1940 if (next == 0xFF) { 1941 // Escape character, regular compression used 1942 _bci += read_signed_int(); 1943 _line += read_signed_int(); 1944 } else { 1945 // Single byte compression used 1946 _bci += next >> 3; 1947 _line += next & 0x7; 1948 } 1949 return true; 1950 } 1951 1952 #if INCLUDE_JVMTI 1953 1954 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1955 BreakpointInfo* bp = method_holder()->breakpoints(); 1956 for (; bp != nullptr; bp = bp->next()) { 1957 if (bp->match(this, bci)) { 1958 return bp->orig_bytecode(); 1959 } 1960 } 1961 { 1962 ResourceMark rm; 1963 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1964 } 1965 return Bytecodes::_shouldnotreachhere; 1966 } 1967 1968 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1969 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1970 BreakpointInfo* bp = method_holder()->breakpoints(); 1971 for (; bp != nullptr; bp = bp->next()) { 1972 if (bp->match(this, bci)) { 1973 bp->set_orig_bytecode(code); 1974 // and continue, in case there is more than one 1975 } 1976 } 1977 } 1978 1979 void Method::set_breakpoint(int bci) { 1980 InstanceKlass* ik = method_holder(); 1981 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1982 bp->set_next(ik->breakpoints()); 1983 ik->set_breakpoints(bp); 1984 // do this last: 1985 bp->set(this); 1986 } 1987 1988 static void clear_matches(Method* m, int bci) { 1989 InstanceKlass* ik = m->method_holder(); 1990 BreakpointInfo* prev_bp = nullptr; 1991 BreakpointInfo* next_bp; 1992 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) { 1993 next_bp = bp->next(); 1994 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1995 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1996 // do this first: 1997 bp->clear(m); 1998 // unhook it 1999 if (prev_bp != nullptr) 2000 prev_bp->set_next(next_bp); 2001 else 2002 ik->set_breakpoints(next_bp); 2003 delete bp; 2004 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 2005 // at same location. So we have multiple matching (method_index and bci) 2006 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 2007 // breakpoint for clear_breakpoint request and keep all other method versions 2008 // BreakpointInfo for future clear_breakpoint request. 2009 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 2010 // which is being called when class is unloaded. We delete all the Breakpoint 2011 // information for all versions of method. We may not correctly restore the original 2012 // bytecode in all method versions, but that is ok. Because the class is being unloaded 2013 // so these methods won't be used anymore. 2014 if (bci >= 0) { 2015 break; 2016 } 2017 } else { 2018 // This one is a keeper. 2019 prev_bp = bp; 2020 } 2021 } 2022 } 2023 2024 void Method::clear_breakpoint(int bci) { 2025 assert(bci >= 0, ""); 2026 clear_matches(this, bci); 2027 } 2028 2029 void Method::clear_all_breakpoints() { 2030 clear_matches(this, -1); 2031 } 2032 2033 #endif // INCLUDE_JVMTI 2034 2035 int Method::invocation_count() const { 2036 MethodCounters* mcs = method_counters(); 2037 MethodData* mdo = method_data(); 2038 if (((mcs != nullptr) ? mcs->invocation_counter()->carry() : false) || 2039 ((mdo != nullptr) ? mdo->invocation_counter()->carry() : false)) { 2040 return InvocationCounter::count_limit; 2041 } else { 2042 return ((mcs != nullptr) ? mcs->invocation_counter()->count() : 0) + 2043 ((mdo != nullptr) ? mdo->invocation_counter()->count() : 0); 2044 } 2045 } 2046 2047 int Method::backedge_count() const { 2048 MethodCounters* mcs = method_counters(); 2049 MethodData* mdo = method_data(); 2050 if (((mcs != nullptr) ? mcs->backedge_counter()->carry() : false) || 2051 ((mdo != nullptr) ? mdo->backedge_counter()->carry() : false)) { 2052 return InvocationCounter::count_limit; 2053 } else { 2054 return ((mcs != nullptr) ? mcs->backedge_counter()->count() : 0) + 2055 ((mdo != nullptr) ? mdo->backedge_counter()->count() : 0); 2056 } 2057 } 2058 2059 int Method::highest_comp_level() const { 2060 const MethodCounters* mcs = method_counters(); 2061 nmethod* nm = code(); 2062 int level = (nm != nullptr) ? nm->comp_level() : CompLevel_none; 2063 if (mcs != nullptr) { 2064 return MAX2(mcs->highest_comp_level(), level); 2065 } else { 2066 return CompLevel_none; 2067 } 2068 } 2069 2070 int Method::highest_osr_comp_level() const { 2071 const MethodCounters* mcs = method_counters(); 2072 if (mcs != nullptr) { 2073 return mcs->highest_osr_comp_level(); 2074 } else { 2075 return CompLevel_none; 2076 } 2077 } 2078 2079 void Method::set_highest_comp_level(int level) { 2080 MethodCounters* mcs = method_counters(); 2081 if (mcs != nullptr) { 2082 mcs->set_highest_comp_level(level); 2083 } 2084 } 2085 2086 void Method::set_highest_osr_comp_level(int level) { 2087 MethodCounters* mcs = method_counters(); 2088 if (mcs != nullptr) { 2089 mcs->set_highest_osr_comp_level(level); 2090 } 2091 } 2092 2093 #if INCLUDE_JVMTI 2094 2095 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 2096 _bci = bci; 2097 _name_index = m->name_index(); 2098 _signature_index = m->signature_index(); 2099 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 2100 if (_orig_bytecode == Bytecodes::_breakpoint) 2101 _orig_bytecode = m->orig_bytecode_at(_bci); 2102 _next = nullptr; 2103 } 2104 2105 void BreakpointInfo::set(Method* method) { 2106 #ifdef ASSERT 2107 { 2108 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 2109 if (code == Bytecodes::_breakpoint) 2110 code = method->orig_bytecode_at(_bci); 2111 assert(orig_bytecode() == code, "original bytecode must be the same"); 2112 } 2113 #endif 2114 Thread *thread = Thread::current(); 2115 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 2116 method->incr_number_of_breakpoints(thread); 2117 { 2118 // Deoptimize all dependents on this method 2119 HandleMark hm(thread); 2120 methodHandle mh(thread, method); 2121 CodeCache::mark_dependents_on_method_for_breakpoint(mh); 2122 } 2123 } 2124 2125 void BreakpointInfo::clear(Method* method) { 2126 *method->bcp_from(_bci) = orig_bytecode(); 2127 assert(method->number_of_breakpoints() > 0, "must not go negative"); 2128 method->decr_number_of_breakpoints(Thread::current()); 2129 } 2130 2131 #endif // INCLUDE_JVMTI 2132 2133 // jmethodID handling 2134 2135 // This is a block allocating object, sort of like JNIHandleBlock, only a 2136 // lot simpler. 2137 // It's allocated on the CHeap because once we allocate a jmethodID, we can 2138 // never get rid of it. 2139 2140 static const int min_block_size = 8; 2141 2142 class JNIMethodBlockNode : public CHeapObj<mtClass> { 2143 friend class JNIMethodBlock; 2144 Method** _methods; 2145 int _number_of_methods; 2146 int _top; 2147 JNIMethodBlockNode* _next; 2148 2149 public: 2150 2151 JNIMethodBlockNode(int num_methods = min_block_size); 2152 2153 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 2154 2155 void ensure_methods(int num_addl_methods) { 2156 if (_top < _number_of_methods) { 2157 num_addl_methods -= _number_of_methods - _top; 2158 if (num_addl_methods <= 0) { 2159 return; 2160 } 2161 } 2162 if (_next == nullptr) { 2163 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 2164 } else { 2165 _next->ensure_methods(num_addl_methods); 2166 } 2167 } 2168 }; 2169 2170 class JNIMethodBlock : public CHeapObj<mtClass> { 2171 JNIMethodBlockNode _head; 2172 JNIMethodBlockNode *_last_free; 2173 public: 2174 static Method* const _free_method; 2175 2176 JNIMethodBlock(int initial_capacity = min_block_size) 2177 : _head(initial_capacity), _last_free(&_head) {} 2178 2179 void ensure_methods(int num_addl_methods) { 2180 _last_free->ensure_methods(num_addl_methods); 2181 } 2182 2183 Method** add_method(Method* m) { 2184 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) { 2185 if (b->_top < b->_number_of_methods) { 2186 // top points to the next free entry. 2187 int i = b->_top; 2188 b->_methods[i] = m; 2189 b->_top++; 2190 _last_free = b; 2191 return &(b->_methods[i]); 2192 } else if (b->_top == b->_number_of_methods) { 2193 // if the next free entry ran off the block see if there's a free entry 2194 for (int i = 0; i < b->_number_of_methods; i++) { 2195 if (b->_methods[i] == _free_method) { 2196 b->_methods[i] = m; 2197 _last_free = b; 2198 return &(b->_methods[i]); 2199 } 2200 } 2201 // Only check each block once for frees. They're very unlikely. 2202 // Increment top past the end of the block. 2203 b->_top++; 2204 } 2205 // need to allocate a next block. 2206 if (b->_next == nullptr) { 2207 b->_next = _last_free = new JNIMethodBlockNode(); 2208 } 2209 } 2210 guarantee(false, "Should always allocate a free block"); 2211 return nullptr; 2212 } 2213 2214 bool contains(Method** m) { 2215 if (m == nullptr) return false; 2216 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2217 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2218 // This is a bit of extra checking, for two reasons. One is 2219 // that contains() deals with pointers that are passed in by 2220 // JNI code, so making sure that the pointer is aligned 2221 // correctly is valuable. The other is that <= and > are 2222 // technically not defined on pointers, so the if guard can 2223 // pass spuriously; no modern compiler is likely to make that 2224 // a problem, though (and if one did, the guard could also 2225 // fail spuriously, which would be bad). 2226 ptrdiff_t idx = m - b->_methods; 2227 if (b->_methods + idx == m) { 2228 return true; 2229 } 2230 } 2231 } 2232 return false; // not found 2233 } 2234 2235 // During class unloading the methods are cleared, which is different 2236 // than freed. 2237 void clear_all_methods() { 2238 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2239 for (int i = 0; i< b->_number_of_methods; i++) { 2240 b->_methods[i] = nullptr; 2241 } 2242 } 2243 } 2244 #ifndef PRODUCT 2245 int count_methods() { 2246 // count all allocated methods 2247 int count = 0; 2248 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2249 for (int i = 0; i< b->_number_of_methods; i++) { 2250 if (b->_methods[i] != _free_method) count++; 2251 } 2252 } 2253 return count; 2254 } 2255 #endif // PRODUCT 2256 }; 2257 2258 // Something that can't be mistaken for an address or a markWord 2259 Method* const JNIMethodBlock::_free_method = (Method*)55; 2260 2261 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) { 2262 _number_of_methods = MAX2(num_methods, min_block_size); 2263 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2264 for (int i = 0; i < _number_of_methods; i++) { 2265 _methods[i] = JNIMethodBlock::_free_method; 2266 } 2267 } 2268 2269 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) { 2270 // Have to add jmethod_ids() to class loader data thread-safely. 2271 // Also have to add the method to the list safely, which the lock 2272 // protects as well. 2273 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag); 2274 if (cld->jmethod_ids() == nullptr) { 2275 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2276 } else { 2277 cld->jmethod_ids()->ensure_methods(capacity); 2278 } 2279 } 2280 2281 // Add a method id to the jmethod_ids 2282 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) { 2283 // Have to add jmethod_ids() to class loader data thread-safely. 2284 // Also have to add the method to the list safely, which the lock 2285 // protects as well. 2286 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check"); 2287 2288 ResourceMark rm; 2289 log_debug(jmethod)("Creating jmethodID for Method %s", m->external_name()); 2290 if (cld->jmethod_ids() == nullptr) { 2291 cld->set_jmethod_ids(new JNIMethodBlock()); 2292 } 2293 // jmethodID is a pointer to Method* 2294 return (jmethodID)cld->jmethod_ids()->add_method(m); 2295 } 2296 2297 jmethodID Method::jmethod_id() { 2298 methodHandle mh(Thread::current(), this); 2299 return method_holder()->get_jmethod_id(mh); 2300 } 2301 2302 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2303 // Can't assert the method_holder is the same because the new method has the 2304 // scratch method holder. 2305 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2306 == new_method->method_holder()->class_loader() || 2307 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution 2308 "changing to a different class loader"); 2309 // Just change the method in place, jmethodID pointer doesn't change. 2310 *((Method**)jmid) = new_method; 2311 } 2312 2313 bool Method::is_method_id(jmethodID mid) { 2314 Method* m = resolve_jmethod_id(mid); 2315 assert(m != nullptr, "should be called with non-null method"); 2316 InstanceKlass* ik = m->method_holder(); 2317 ClassLoaderData* cld = ik->class_loader_data(); 2318 if (cld->jmethod_ids() == nullptr) return false; 2319 return (cld->jmethod_ids()->contains((Method**)mid)); 2320 } 2321 2322 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2323 if (mid == nullptr) return nullptr; 2324 Method* o = resolve_jmethod_id(mid); 2325 if (o == nullptr || o == JNIMethodBlock::_free_method) { 2326 return nullptr; 2327 } 2328 // Method should otherwise be valid. Assert for testing. 2329 assert(is_valid_method(o), "should be valid jmethodid"); 2330 // If the method's class holder object is unreferenced, but not yet marked as 2331 // unloaded, we need to return null here too because after a safepoint, its memory 2332 // will be reclaimed. 2333 return o->method_holder()->is_loader_alive() ? o : nullptr; 2334 }; 2335 2336 void Method::set_on_stack(const bool value) { 2337 // Set both the method itself and its constant pool. The constant pool 2338 // on stack means some method referring to it is also on the stack. 2339 constants()->set_on_stack(value); 2340 2341 bool already_set = on_stack_flag(); 2342 set_on_stack_flag(value); 2343 if (value && !already_set) { 2344 MetadataOnStackMark::record(this); 2345 } 2346 } 2347 2348 void Method::record_gc_epoch() { 2349 // If any method is on the stack in continuations, none of them can be reclaimed, 2350 // so save the marking cycle to check for the whole class in the cpCache. 2351 // The cpCache is writeable. 2352 constants()->cache()->record_gc_epoch(); 2353 } 2354 2355 // Called when the class loader is unloaded to make all methods weak. 2356 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2357 loader_data->jmethod_ids()->clear_all_methods(); 2358 } 2359 2360 void Method::clear_jmethod_id() { 2361 // Being at a safepoint prevents racing against other class redefinitions 2362 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); 2363 // The jmethodID is not stored in the Method instance, we need to look it up first 2364 jmethodID methodid = find_jmethod_id_or_null(); 2365 // We need to make sure that jmethodID actually resolves to this method 2366 // - multiple redefined versions may share jmethodID slots and if a method 2367 // has already been rewired to a newer version we could be removing reference 2368 // to a still existing method instance 2369 if (methodid != nullptr && *((Method**)methodid) == this) { 2370 *((Method**)methodid) = nullptr; 2371 } 2372 } 2373 2374 bool Method::has_method_vptr(const void* ptr) { 2375 Method m; 2376 // This assumes that the vtbl pointer is the first word of a C++ object. 2377 return dereference_vptr(&m) == dereference_vptr(ptr); 2378 } 2379 2380 // Check that this pointer is valid by checking that the vtbl pointer matches 2381 bool Method::is_valid_method(const Method* m) { 2382 if (m == nullptr) { 2383 return false; 2384 } else if ((intptr_t(m) & (wordSize-1)) != 0) { 2385 // Quick sanity check on pointer. 2386 return false; 2387 } else if (!os::is_readable_range(m, m + 1)) { 2388 return false; 2389 } else if (m->is_shared()) { 2390 return CppVtables::is_valid_shared_method(m); 2391 } else if (Metaspace::contains_non_shared(m)) { 2392 return has_method_vptr((const void*)m); 2393 } else { 2394 return false; 2395 } 2396 } 2397 2398 #ifndef PRODUCT 2399 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) { 2400 out->print("%d", loader_data->jmethod_ids()->count_methods()); 2401 } 2402 #endif // PRODUCT 2403 2404 2405 // Printing 2406 2407 #ifndef PRODUCT 2408 2409 void Method::print_on(outputStream* st) const { 2410 ResourceMark rm; 2411 assert(is_method(), "must be method"); 2412 st->print_cr("%s", internal_name()); 2413 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this)); 2414 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2415 st->print (" - constants: " PTR_FORMAT " ", p2i(constants())); 2416 constants()->print_value_on(st); st->cr(); 2417 st->print (" - access: 0x%x ", access_flags().as_method_flags()); access_flags().print_on(st); st->cr(); 2418 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr(); 2419 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2420 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2421 st->print_cr(" - max stack: %d", max_stack()); 2422 st->print_cr(" - max locals: %d", max_locals()); 2423 st->print_cr(" - size of params: %d", size_of_parameters()); 2424 st->print_cr(" - method size: %d", method_size()); 2425 if (intrinsic_id() != vmIntrinsics::_none) 2426 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id())); 2427 if (highest_comp_level() != CompLevel_none) 2428 st->print_cr(" - highest level: %d", highest_comp_level()); 2429 st->print_cr(" - vtable index: %d", _vtable_index); 2430 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry())); 2431 st->print( " - adapters: "); 2432 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2433 if (a == nullptr) 2434 st->print_cr(PTR_FORMAT, p2i(a)); 2435 else 2436 a->print_adapter_on(st); 2437 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry())); 2438 st->print_cr(" - code size: %d", code_size()); 2439 if (code_size() != 0) { 2440 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base())); 2441 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size())); 2442 } 2443 if (method_data() != nullptr) { 2444 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data())); 2445 } 2446 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2447 if (checked_exceptions_length() > 0) { 2448 CheckedExceptionElement* table = checked_exceptions_start(); 2449 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table)); 2450 if (Verbose) { 2451 for (int i = 0; i < checked_exceptions_length(); i++) { 2452 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2453 } 2454 } 2455 } 2456 if (has_linenumber_table()) { 2457 u_char* table = compressed_linenumber_table(); 2458 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table)); 2459 if (Verbose) { 2460 CompressedLineNumberReadStream stream(table); 2461 while (stream.read_pair()) { 2462 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2463 } 2464 } 2465 } 2466 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2467 if (localvariable_table_length() > 0) { 2468 LocalVariableTableElement* table = localvariable_table_start(); 2469 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table)); 2470 if (Verbose) { 2471 for (int i = 0; i < localvariable_table_length(); i++) { 2472 int bci = table[i].start_bci; 2473 int len = table[i].length; 2474 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2475 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2476 int slot = table[i].slot; 2477 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2478 } 2479 } 2480 } 2481 if (code() != nullptr) { 2482 st->print (" - compiled code: "); 2483 code()->print_value_on(st); 2484 } 2485 if (is_native()) { 2486 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function())); 2487 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler())); 2488 } 2489 } 2490 2491 void Method::print_linkage_flags(outputStream* st) { 2492 access_flags().print_on(st); 2493 if (is_default_method()) { 2494 st->print("default "); 2495 } 2496 if (is_overpass()) { 2497 st->print("overpass "); 2498 } 2499 } 2500 #endif //PRODUCT 2501 2502 void Method::print_value_on(outputStream* st) const { 2503 assert(is_method(), "must be method"); 2504 st->print("%s", internal_name()); 2505 print_address_on(st); 2506 st->print(" "); 2507 name()->print_value_on(st); 2508 st->print(" "); 2509 signature()->print_value_on(st); 2510 st->print(" in "); 2511 method_holder()->print_value_on(st); 2512 if (WizardMode) st->print("#%d", _vtable_index); 2513 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2514 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code()); 2515 } 2516 2517 // Verification 2518 2519 void Method::verify_on(outputStream* st) { 2520 guarantee(is_method(), "object must be method"); 2521 guarantee(constants()->is_constantPool(), "should be constant pool"); 2522 MethodData* md = method_data(); 2523 guarantee(md == nullptr || 2524 md->is_methodData(), "should be method data"); 2525 }