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* td) { 626 MethodCounters* mcs = method_counters(); 627 if (mcs == nullptr) { 628 return false; 629 } else { 630 return mcs->init_method_training_data(td); 631 } 632 } 633 634 bool Method::install_training_method_data(const methodHandle& method) { 635 MethodTrainingData* mtd = MethodTrainingData::find(method); 636 if (mtd != nullptr && mtd->final_profile() != nullptr) { 637 Atomic::replace_if_null(&method->_method_data, mtd->final_profile()); 638 return true; 639 } 640 return false; 641 } 642 643 // Build a MethodData* object to hold profiling information collected on this 644 // method when requested. 645 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) { 646 if (install_training_method_data(method)) { 647 return; 648 } 649 // Do not profile the method if metaspace has hit an OOM previously 650 // allocating profiling data. Callers clear pending exception so don't 651 // add one here. 652 if (ClassLoaderDataGraph::has_metaspace_oom()) { 653 return; 654 } 655 656 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 657 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 658 if (HAS_PENDING_EXCEPTION) { 659 CompileBroker::log_metaspace_failure(); 660 ClassLoaderDataGraph::set_metaspace_oom(true); 661 return; // return the exception (which is cleared) 662 } 663 664 if (!Atomic::replace_if_null(&method->_method_data, method_data)) { 665 MetadataFactory::free_metadata(loader_data, method_data); 666 return; 667 } 668 669 if (ForceProfiling && TrainingData::need_data()) { 670 MethodTrainingData* mtd = MethodTrainingData::make(method, false); 671 guarantee(mtd != nullptr, ""); 672 } 673 674 if (PrintMethodData) { 675 ResourceMark rm(THREAD); 676 tty->print("build_profiling_method_data for "); 677 method->print_name(tty); 678 tty->cr(); 679 // At the end of the run, the MDO, full of data, will be dumped. 680 } 681 } 682 683 MethodCounters* Method::build_method_counters(Thread* current, Method* m) { 684 // Do not profile the method if metaspace has hit an OOM previously 685 if (ClassLoaderDataGraph::has_metaspace_oom()) { 686 return nullptr; 687 } 688 689 methodHandle mh(current, m); 690 MethodCounters* counters; 691 if (current->is_Java_thread()) { 692 JavaThread* THREAD = JavaThread::cast(current); // For exception macros. 693 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold 694 // if needed. 695 counters = MethodCounters::allocate_with_exception(mh, THREAD); 696 if (HAS_PENDING_EXCEPTION) { 697 CLEAR_PENDING_EXCEPTION; 698 } 699 } else { 700 // Call metaspace allocation that doesn't throw exception if the 701 // current thread isn't a JavaThread, ie. the VMThread. 702 counters = MethodCounters::allocate_no_exception(mh); 703 } 704 705 if (counters == nullptr) { 706 CompileBroker::log_metaspace_failure(); 707 ClassLoaderDataGraph::set_metaspace_oom(true); 708 return nullptr; 709 } 710 711 if (!mh->init_method_counters(counters)) { 712 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 713 } 714 715 if (ForceProfiling && TrainingData::need_data()) { 716 MethodTrainingData* mtd = MethodTrainingData::make(mh, false); 717 guarantee(mtd != nullptr, ""); 718 } 719 720 return mh->method_counters(); 721 } 722 723 bool Method::init_method_counters(MethodCounters* counters) { 724 // Try to install a pointer to MethodCounters, return true on success. 725 return Atomic::replace_if_null(&_method_counters, counters); 726 } 727 728 void Method::set_exception_handler_entered(int handler_bci) { 729 if (ProfileExceptionHandlers) { 730 MethodData* mdo = method_data(); 731 if (mdo != nullptr) { 732 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci); 733 handler_data.set_exception_handler_entered(); 734 } 735 } 736 } 737 738 int Method::extra_stack_words() { 739 // not an inline function, to avoid a header dependency on Interpreter 740 return extra_stack_entries() * Interpreter::stackElementSize; 741 } 742 743 bool Method::compute_has_loops_flag() { 744 BytecodeStream bcs(methodHandle(Thread::current(), this)); 745 Bytecodes::Code bc; 746 747 while ((bc = bcs.next()) >= 0) { 748 switch (bc) { 749 case Bytecodes::_ifeq: 750 case Bytecodes::_ifnull: 751 case Bytecodes::_iflt: 752 case Bytecodes::_ifle: 753 case Bytecodes::_ifne: 754 case Bytecodes::_ifnonnull: 755 case Bytecodes::_ifgt: 756 case Bytecodes::_ifge: 757 case Bytecodes::_if_icmpeq: 758 case Bytecodes::_if_icmpne: 759 case Bytecodes::_if_icmplt: 760 case Bytecodes::_if_icmpgt: 761 case Bytecodes::_if_icmple: 762 case Bytecodes::_if_icmpge: 763 case Bytecodes::_if_acmpeq: 764 case Bytecodes::_if_acmpne: 765 case Bytecodes::_goto: 766 case Bytecodes::_jsr: 767 if (bcs.dest() < bcs.next_bci()) { 768 return set_has_loops(); 769 } 770 break; 771 772 case Bytecodes::_goto_w: 773 case Bytecodes::_jsr_w: 774 if (bcs.dest_w() < bcs.next_bci()) { 775 return set_has_loops(); 776 } 777 break; 778 779 case Bytecodes::_lookupswitch: { 780 Bytecode_lookupswitch lookupswitch(this, bcs.bcp()); 781 if (lookupswitch.default_offset() < 0) { 782 return set_has_loops(); 783 } else { 784 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) { 785 LookupswitchPair pair = lookupswitch.pair_at(i); 786 if (pair.offset() < 0) { 787 return set_has_loops(); 788 } 789 } 790 } 791 break; 792 } 793 case Bytecodes::_tableswitch: { 794 Bytecode_tableswitch tableswitch(this, bcs.bcp()); 795 if (tableswitch.default_offset() < 0) { 796 return set_has_loops(); 797 } else { 798 for (int i = 0; i < tableswitch.length(); ++i) { 799 if (tableswitch.dest_offset_at(i) < 0) { 800 return set_has_loops(); 801 } 802 } 803 } 804 break; 805 } 806 default: 807 break; 808 } 809 } 810 811 _flags.set_has_loops_flag_init(true); 812 return false; 813 } 814 815 bool Method::is_final_method(AccessFlags class_access_flags) const { 816 // or "does_not_require_vtable_entry" 817 // default method or overpass can occur, is not final (reuses vtable entry) 818 // private methods in classes get vtable entries for backward class compatibility. 819 if (is_overpass() || is_default_method()) return false; 820 return is_final() || class_access_flags.is_final(); 821 } 822 823 bool Method::is_final_method() const { 824 return is_final_method(method_holder()->access_flags()); 825 } 826 827 bool Method::is_default_method() const { 828 if (method_holder() != nullptr && 829 method_holder()->is_interface() && 830 !is_abstract() && !is_private()) { 831 return true; 832 } else { 833 return false; 834 } 835 } 836 837 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 838 if (is_final_method(class_access_flags)) return true; 839 #ifdef ASSERT 840 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 841 if (class_access_flags.is_interface()) { 842 ResourceMark rm; 843 assert(is_nonv == is_static() || is_nonv == is_private(), 844 "nonvirtual unexpected for non-static, non-private: %s", 845 name_and_sig_as_C_string()); 846 } 847 #endif 848 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 849 return vtable_index() == nonvirtual_vtable_index; 850 } 851 852 bool Method::can_be_statically_bound() const { 853 return can_be_statically_bound(method_holder()->access_flags()); 854 } 855 856 bool Method::can_be_statically_bound(InstanceKlass* context) const { 857 return (method_holder() == context) && can_be_statically_bound(); 858 } 859 860 /** 861 * Returns false if this is one of specially treated methods for 862 * which we have to provide stack trace in throw in compiled code. 863 * Returns true otherwise. 864 */ 865 bool Method::can_omit_stack_trace() { 866 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) { 867 return false; // All methods in sun.invoke.util.ValueConversions 868 } 869 return true; 870 } 871 872 bool Method::is_accessor() const { 873 return is_getter() || is_setter(); 874 } 875 876 bool Method::is_getter() const { 877 if (code_size() != 5) return false; 878 if (size_of_parameters() != 1) return false; 879 if (java_code_at(0) != Bytecodes::_aload_0) return false; 880 if (java_code_at(1) != Bytecodes::_getfield) return false; 881 switch (java_code_at(4)) { 882 case Bytecodes::_ireturn: 883 case Bytecodes::_lreturn: 884 case Bytecodes::_freturn: 885 case Bytecodes::_dreturn: 886 case Bytecodes::_areturn: 887 break; 888 default: 889 return false; 890 } 891 return true; 892 } 893 894 bool Method::is_setter() const { 895 if (code_size() != 6) return false; 896 if (java_code_at(0) != Bytecodes::_aload_0) return false; 897 switch (java_code_at(1)) { 898 case Bytecodes::_iload_1: 899 case Bytecodes::_aload_1: 900 case Bytecodes::_fload_1: 901 if (size_of_parameters() != 2) return false; 902 break; 903 case Bytecodes::_dload_1: 904 case Bytecodes::_lload_1: 905 if (size_of_parameters() != 3) return false; 906 break; 907 default: 908 return false; 909 } 910 if (java_code_at(2) != Bytecodes::_putfield) return false; 911 if (java_code_at(5) != Bytecodes::_return) return false; 912 return true; 913 } 914 915 bool Method::is_constant_getter() const { 916 int last_index = code_size() - 1; 917 // Check if the first 1-3 bytecodes are a constant push 918 // and the last bytecode is a return. 919 return (2 <= code_size() && code_size() <= 4 && 920 Bytecodes::is_const(java_code_at(0)) && 921 Bytecodes::length_for(java_code_at(0)) == last_index && 922 Bytecodes::is_return(java_code_at(last_index))); 923 } 924 925 bool Method::has_valid_initializer_flags() const { 926 return (is_static() || 927 method_holder()->major_version() < 51); 928 } 929 930 bool Method::is_static_initializer() const { 931 // For classfiles version 51 or greater, ensure that the clinit method is 932 // static. Non-static methods with the name "<clinit>" are not static 933 // initializers. (older classfiles exempted for backward compatibility) 934 return name() == vmSymbols::class_initializer_name() && 935 has_valid_initializer_flags(); 936 } 937 938 bool Method::is_object_initializer() const { 939 return name() == vmSymbols::object_initializer_name(); 940 } 941 942 bool Method::needs_clinit_barrier() const { 943 return is_static() && !method_holder()->is_initialized(); 944 } 945 946 bool Method::code_has_clinit_barriers() const { 947 nmethod* nm = code(); 948 return (nm != nullptr) && nm->has_clinit_barriers(); 949 } 950 951 bool Method::is_object_wait0() const { 952 return klass_name() == vmSymbols::java_lang_Object() 953 && name() == vmSymbols::wait_name(); 954 } 955 956 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 957 int length = method->checked_exceptions_length(); 958 if (length == 0) { // common case 959 return objArrayHandle(THREAD, Universe::the_empty_class_array()); 960 } else { 961 methodHandle h_this(THREAD, method); 962 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle())); 963 objArrayHandle mirrors (THREAD, m_oop); 964 for (int i = 0; i < length; i++) { 965 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 966 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 967 if (log_is_enabled(Warning, exceptions) && 968 !k->is_subclass_of(vmClasses::Throwable_klass())) { 969 ResourceMark rm(THREAD); 970 log_warning(exceptions)( 971 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable", 972 k->external_name(), method->external_name()); 973 } 974 mirrors->obj_at_put(i, k->java_mirror()); 975 } 976 return mirrors; 977 } 978 }; 979 980 981 int Method::line_number_from_bci(int bci) const { 982 int best_bci = 0; 983 int best_line = -1; 984 if (bci == SynchronizationEntryBCI) bci = 0; 985 if (0 <= bci && bci < code_size() && has_linenumber_table()) { 986 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 987 // Not necessarily sorted and not necessarily one-to-one. 988 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 989 while (stream.read_pair()) { 990 if (stream.bci() == bci) { 991 // perfect match 992 return stream.line(); 993 } else { 994 // update best_bci/line 995 if (stream.bci() < bci && stream.bci() >= best_bci) { 996 best_bci = stream.bci(); 997 best_line = stream.line(); 998 } 999 } 1000 } 1001 } 1002 return best_line; 1003 } 1004 1005 1006 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 1007 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 1008 Thread *thread = Thread::current(); 1009 Symbol* klass_name = constants()->klass_name_at(klass_index); 1010 Handle loader(thread, method_holder()->class_loader()); 1011 return SystemDictionary::find_instance_klass(thread, klass_name, loader) != nullptr; 1012 } else { 1013 return true; 1014 } 1015 } 1016 1017 1018 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const { 1019 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc); 1020 if (must_be_resolved) { 1021 // Make sure klass is resolved in constantpool. 1022 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 1023 } 1024 return is_klass_loaded_by_klass_index(klass_index); 1025 } 1026 1027 1028 void Method::set_native_function(address function, bool post_event_flag) { 1029 assert(function != nullptr, "use clear_native_function to unregister natives"); 1030 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 1031 address* native_function = native_function_addr(); 1032 1033 // We can see racers trying to place the same native function into place. Once 1034 // is plenty. 1035 address current = *native_function; 1036 if (current == function) return; 1037 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 1038 function != nullptr) { 1039 // native_method_throw_unsatisfied_link_error_entry() should only 1040 // be passed when post_event_flag is false. 1041 assert(function != 1042 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1043 "post_event_flag mismatch"); 1044 1045 // post the bind event, and possible change the bind function 1046 JvmtiExport::post_native_method_bind(this, &function); 1047 } 1048 *native_function = function; 1049 // This function can be called more than once. We must make sure that we always 1050 // use the latest registered method -> check if a stub already has been generated. 1051 // If so, we have to make it not_entrant. 1052 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 1053 if (nm != nullptr) { 1054 nm->make_not_entrant(); 1055 } 1056 } 1057 1058 1059 bool Method::has_native_function() const { 1060 if (is_special_native_intrinsic()) 1061 return false; // special-cased in SharedRuntime::generate_native_wrapper 1062 address func = native_function(); 1063 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 1064 } 1065 1066 1067 void Method::clear_native_function() { 1068 // Note: is_method_handle_intrinsic() is allowed here. 1069 set_native_function( 1070 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1071 !native_bind_event_is_interesting); 1072 this->unlink_code(); 1073 } 1074 1075 1076 void Method::set_signature_handler(address handler) { 1077 address* signature_handler = signature_handler_addr(); 1078 *signature_handler = handler; 1079 } 1080 1081 1082 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 1083 assert(reason != nullptr, "must provide a reason"); 1084 if (PrintCompilation && report) { 1085 ttyLocker ttyl; 1086 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 1087 if (comp_level == CompLevel_all) { 1088 tty->print("all levels "); 1089 } else { 1090 tty->print("level %d ", comp_level); 1091 } 1092 this->print_short_name(tty); 1093 int size = this->code_size(); 1094 if (size > 0) { 1095 tty->print(" (%d bytes)", size); 1096 } 1097 if (reason != nullptr) { 1098 tty->print(" %s", reason); 1099 } 1100 tty->cr(); 1101 } 1102 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) { 1103 ttyLocker ttyl; 1104 xtty->begin_elem("make_not_compilable thread='%zu' osr='%d' level='%d'", 1105 os::current_thread_id(), is_osr, comp_level); 1106 if (reason != nullptr) { 1107 xtty->print(" reason=\'%s\'", reason); 1108 } 1109 xtty->method(this); 1110 xtty->stamp(); 1111 xtty->end_elem(); 1112 } 1113 } 1114 1115 bool Method::is_always_compilable() const { 1116 // Generated adapters must be compiled 1117 if (is_special_native_intrinsic() && is_synthetic()) { 1118 assert(!is_not_c1_compilable(), "sanity check"); 1119 assert(!is_not_c2_compilable(), "sanity check"); 1120 return true; 1121 } 1122 1123 return false; 1124 } 1125 1126 bool Method::is_not_compilable(int comp_level) const { 1127 if (number_of_breakpoints() > 0) 1128 return true; 1129 if (is_always_compilable()) 1130 return false; 1131 if (comp_level == CompLevel_any) 1132 return is_not_c1_compilable() && is_not_c2_compilable(); 1133 if (is_c1_compile(comp_level)) 1134 return is_not_c1_compilable(); 1135 if (is_c2_compile(comp_level)) 1136 return is_not_c2_compilable(); 1137 return false; 1138 } 1139 1140 // call this when compiler finds that this method is not compilable 1141 void Method::set_not_compilable(const char* reason, int comp_level, bool report) { 1142 if (is_always_compilable()) { 1143 // Don't mark a method which should be always compilable 1144 return; 1145 } 1146 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 1147 if (comp_level == CompLevel_all) { 1148 set_is_not_c1_compilable(); 1149 set_is_not_c2_compilable(); 1150 } else { 1151 if (is_c1_compile(comp_level)) 1152 set_is_not_c1_compilable(); 1153 if (is_c2_compile(comp_level)) 1154 set_is_not_c2_compilable(); 1155 } 1156 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check"); 1157 } 1158 1159 bool Method::is_not_osr_compilable(int comp_level) const { 1160 if (is_not_compilable(comp_level)) 1161 return true; 1162 if (comp_level == CompLevel_any) 1163 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable(); 1164 if (is_c1_compile(comp_level)) 1165 return is_not_c1_osr_compilable(); 1166 if (is_c2_compile(comp_level)) 1167 return is_not_c2_osr_compilable(); 1168 return false; 1169 } 1170 1171 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) { 1172 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 1173 if (comp_level == CompLevel_all) { 1174 set_is_not_c1_osr_compilable(); 1175 set_is_not_c2_osr_compilable(); 1176 } else { 1177 if (is_c1_compile(comp_level)) 1178 set_is_not_c1_osr_compilable(); 1179 if (is_c2_compile(comp_level)) 1180 set_is_not_c2_osr_compilable(); 1181 } 1182 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check"); 1183 } 1184 1185 // Revert to using the interpreter and clear out the nmethod 1186 void Method::clear_code() { 1187 // this may be null if c2i adapters have not been made yet 1188 // Only should happen at allocate time. 1189 if (adapter() == nullptr) { 1190 _from_compiled_entry = nullptr; 1191 } else { 1192 _from_compiled_entry = adapter()->get_c2i_entry(); 1193 } 1194 OrderAccess::storestore(); 1195 _from_interpreted_entry = _i2i_entry; 1196 OrderAccess::storestore(); 1197 _code = nullptr; 1198 } 1199 1200 void Method::unlink_code(nmethod *compare) { 1201 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag); 1202 // We need to check if either the _code or _from_compiled_code_entry_point 1203 // refer to this nmethod because there is a race in setting these two fields 1204 // in Method* as seen in bugid 4947125. 1205 if (code() == compare || 1206 from_compiled_entry() == compare->verified_entry_point()) { 1207 clear_code(); 1208 } 1209 } 1210 1211 void Method::unlink_code() { 1212 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag); 1213 clear_code(); 1214 } 1215 1216 #if INCLUDE_CDS 1217 // Called by class data sharing to remove any entry points (which are not shared) 1218 void Method::unlink_method() { 1219 assert(CDSConfig::is_dumping_archive(), "sanity"); 1220 _code = nullptr; 1221 if (!CDSConfig::is_dumping_adapters() || AdapterHandlerLibrary::is_abstract_method_adapter(_adapter)) { 1222 _adapter = nullptr; 1223 } 1224 _i2i_entry = nullptr; 1225 _from_compiled_entry = nullptr; 1226 _from_interpreted_entry = nullptr; 1227 1228 if (is_native()) { 1229 *native_function_addr() = nullptr; 1230 set_signature_handler(nullptr); 1231 } 1232 NOT_PRODUCT(set_compiled_invocation_count(0);) 1233 1234 clear_method_data(); 1235 clear_method_counters(); 1236 clear_is_not_c1_compilable(); 1237 clear_is_not_c1_osr_compilable(); 1238 clear_is_not_c2_compilable(); 1239 clear_is_not_c2_osr_compilable(); 1240 clear_queued_for_compilation(); 1241 set_pending_queue_processed(false); 1242 remove_unshareable_flags(); 1243 } 1244 1245 void Method::remove_unshareable_flags() { 1246 // clear all the flags that shouldn't be in the archived version 1247 assert(!is_old(), "must be"); 1248 assert(!is_obsolete(), "must be"); 1249 assert(!is_deleted(), "must be"); 1250 1251 set_is_prefixed_native(false); 1252 set_queued_for_compilation(false); 1253 set_pending_queue_processed(false); 1254 set_is_not_c2_compilable(false); 1255 set_is_not_c1_compilable(false); 1256 set_is_not_c2_osr_compilable(false); 1257 set_on_stack_flag(false); 1258 set_has_upcall_on_method_entry(false); 1259 set_has_upcall_on_method_exit(false); 1260 } 1261 #endif 1262 1263 // Called when the method_holder is getting linked. Setup entrypoints so the method 1264 // is ready to be called from interpreter, compiler, and vtables. 1265 void Method::link_method(const methodHandle& h_method, TRAPS) { 1266 if (log_is_enabled(Info, perf, class, link)) { 1267 ClassLoader::perf_ik_link_methods_count()->inc(); 1268 } 1269 1270 // If the code cache is full, we may reenter this function for the 1271 // leftover methods that weren't linked. 1272 if (adapter() != nullptr && !adapter()->is_shared()) { 1273 return; 1274 } 1275 assert( _code == nullptr, "nothing compiled yet" ); 1276 1277 // Setup interpreter entrypoint 1278 assert(this == h_method(), "wrong h_method()" ); 1279 1280 assert(adapter() == nullptr || adapter()->is_linked(), "init'd to null or restored from cache"); 1281 address entry = Interpreter::entry_for_method(h_method); 1282 assert(entry != nullptr, "interpreter entry must be non-null"); 1283 // Sets both _i2i_entry and _from_interpreted_entry 1284 set_interpreter_entry(entry); 1285 1286 // Don't overwrite already registered native entries. 1287 if (is_native() && !has_native_function()) { 1288 set_native_function( 1289 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1290 !native_bind_event_is_interesting); 1291 } 1292 1293 // Setup compiler entrypoint. This is made eagerly, so we do not need 1294 // special handling of vtables. An alternative is to make adapters more 1295 // lazily by calling make_adapter() from from_compiled_entry() for the 1296 // normal calls. For vtable calls life gets more complicated. When a 1297 // call-site goes mega-morphic we need adapters in all methods which can be 1298 // called from the vtable. We need adapters on such methods that get loaded 1299 // later. Ditto for mega-morphic itable calls. If this proves to be a 1300 // problem we'll make these lazily later. 1301 if (_adapter == nullptr) { 1302 (void) make_adapters(h_method, CHECK); 1303 } 1304 1305 // ONLY USE the h_method now as make_adapter may have blocked 1306 1307 if (h_method->is_continuation_native_intrinsic()) { 1308 _from_interpreted_entry = nullptr; 1309 _from_compiled_entry = nullptr; 1310 _i2i_entry = nullptr; 1311 if (Continuations::enabled()) { 1312 assert(!Threads::is_vm_complete(), "should only be called during vm init"); 1313 AdapterHandlerLibrary::create_native_wrapper(h_method); 1314 if (!h_method->has_compiled_code()) { 1315 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small"); 1316 } 1317 assert(_from_interpreted_entry == get_i2c_entry(), "invariant"); 1318 } 1319 } 1320 if (_preload_code != nullptr) { 1321 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag); 1322 set_code(h_method, _preload_code); 1323 assert(((nmethod*)_preload_code)->scc_entry() == _scc_entry, "sanity"); 1324 } 1325 } 1326 1327 address Method::make_adapters(const methodHandle& mh, TRAPS) { 1328 PerfTraceElapsedTime timer(ClassLoader::perf_method_adapters_time()); 1329 1330 // Adapters for compiled code are made eagerly here. They are fairly 1331 // small (generally < 100 bytes) and quick to make (and cached and shared) 1332 // so making them eagerly shouldn't be too expensive. 1333 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1334 if (adapter == nullptr ) { 1335 if (!is_init_completed()) { 1336 // Don't throw exceptions during VM initialization because java.lang.* classes 1337 // might not have been initialized, causing problems when constructing the 1338 // Java exception object. 1339 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1340 } else { 1341 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters"); 1342 } 1343 } 1344 1345 mh->set_adapter_entry(adapter); 1346 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1347 return adapter->get_c2i_entry(); 1348 } 1349 1350 // The verified_code_entry() must be called when a invoke is resolved 1351 // on this method. 1352 1353 // It returns the compiled code entry point, after asserting not null. 1354 // This function is called after potential safepoints so that nmethod 1355 // or adapter that it points to is still live and valid. 1356 // This function must not hit a safepoint! 1357 address Method::verified_code_entry() { 1358 debug_only(NoSafepointVerifier nsv;) 1359 assert(_from_compiled_entry != nullptr, "must be set"); 1360 return _from_compiled_entry; 1361 } 1362 1363 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1364 // (could be racing a deopt). 1365 // Not inline to avoid circular ref. 1366 bool Method::check_code() const { 1367 // cached in a register or local. There's a race on the value of the field. 1368 nmethod *code = Atomic::load_acquire(&_code); 1369 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method()); 1370 } 1371 1372 // Install compiled code. Instantly it can execute. 1373 void Method::set_code(const methodHandle& mh, nmethod *code) { 1374 assert_lock_strong(NMethodState_lock); 1375 assert( code, "use clear_code to remove code" ); 1376 assert( mh->check_code(), "" ); 1377 1378 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!"); 1379 1380 // These writes must happen in this order, because the interpreter will 1381 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1382 // which jumps to _from_compiled_entry. 1383 mh->_code = code; // Assign before allowing compiled code to exec 1384 1385 int comp_level = code->comp_level(); 1386 // In theory there could be a race here. In practice it is unlikely 1387 // and not worth worrying about. 1388 if (comp_level > mh->highest_comp_level()) { 1389 mh->set_highest_comp_level(comp_level); 1390 } 1391 1392 OrderAccess::storestore(); 1393 mh->_from_compiled_entry = code->verified_entry_point(); 1394 OrderAccess::storestore(); 1395 1396 if (mh->is_continuation_native_intrinsic()) { 1397 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method 1398 1399 if (mh->is_continuation_enter_intrinsic()) { 1400 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted 1401 mh->_i2i_entry = ContinuationEntry::interpreted_entry(); 1402 } else if (mh->is_continuation_yield_intrinsic()) { 1403 mh->_i2i_entry = mh->get_i2c_entry(); 1404 } else { 1405 guarantee(false, "Unknown Continuation native intrinsic"); 1406 } 1407 // This must come last, as it is what's tested in LinkResolver::resolve_static_call 1408 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry()); 1409 } else if (!mh->is_method_handle_intrinsic()) { 1410 // Instantly compiled code can execute. 1411 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1412 } 1413 } 1414 1415 1416 bool Method::is_overridden_in(Klass* k) const { 1417 InstanceKlass* ik = InstanceKlass::cast(k); 1418 1419 if (ik->is_interface()) return false; 1420 1421 // If method is an interface, we skip it - except if it 1422 // is a miranda method 1423 if (method_holder()->is_interface()) { 1424 // Check that method is not a miranda method 1425 if (ik->lookup_method(name(), signature()) == nullptr) { 1426 // No implementation exist - so miranda method 1427 return false; 1428 } 1429 return true; 1430 } 1431 1432 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1433 if (!has_vtable_index()) { 1434 return false; 1435 } else { 1436 Method* vt_m = ik->method_at_vtable(vtable_index()); 1437 return vt_m != this; 1438 } 1439 } 1440 1441 1442 // give advice about whether this Method* should be cached or not 1443 bool Method::should_not_be_cached() const { 1444 if (is_old()) { 1445 // This method has been redefined. It is either EMCP or obsolete 1446 // and we don't want to cache it because that would pin the method 1447 // down and prevent it from being collectible if and when it 1448 // finishes executing. 1449 return true; 1450 } 1451 1452 // caching this method should be just fine 1453 return false; 1454 } 1455 1456 1457 /** 1458 * Returns true if this is one of the specially treated methods for 1459 * security related stack walks (like Reflection.getCallerClass). 1460 */ 1461 bool Method::is_ignored_by_security_stack_walk() const { 1462 if (intrinsic_id() == vmIntrinsics::_invoke) { 1463 // This is Method.invoke() -- ignore it 1464 return true; 1465 } 1466 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) { 1467 // This is an auxiliary frame -- ignore it 1468 return true; 1469 } 1470 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1471 // This is an internal adapter frame for method handles -- ignore it 1472 return true; 1473 } 1474 return false; 1475 } 1476 1477 1478 // Constant pool structure for invoke methods: 1479 enum { 1480 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1481 _imcp_invoke_signature, // utf8: (variable Symbol*) 1482 _imcp_limit 1483 }; 1484 1485 // Test if this method is an MH adapter frame generated by Java code. 1486 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1487 bool Method::is_compiled_lambda_form() const { 1488 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1489 } 1490 1491 // Test if this method is an internal MH primitive method. 1492 bool Method::is_method_handle_intrinsic() const { 1493 vmIntrinsics::ID iid = intrinsic_id(); 1494 return (MethodHandles::is_signature_polymorphic(iid) && 1495 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1496 } 1497 1498 bool Method::has_member_arg() const { 1499 vmIntrinsics::ID iid = intrinsic_id(); 1500 return (MethodHandles::is_signature_polymorphic(iid) && 1501 MethodHandles::has_member_arg(iid)); 1502 } 1503 1504 // Make an instance of a signature-polymorphic internal MH primitive. 1505 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1506 Symbol* signature, 1507 TRAPS) { 1508 ResourceMark rm(THREAD); 1509 methodHandle empty; 1510 1511 InstanceKlass* holder = vmClasses::MethodHandle_klass(); 1512 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1513 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1514 1515 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1516 1517 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1518 name->increment_refcount(); 1519 signature->increment_refcount(); 1520 1521 int cp_length = _imcp_limit; 1522 ClassLoaderData* loader_data = holder->class_loader_data(); 1523 constantPoolHandle cp; 1524 { 1525 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1526 cp = constantPoolHandle(THREAD, cp_oop); 1527 } 1528 cp->copy_fields(holder->constants()); 1529 cp->set_pool_holder(holder); 1530 cp->symbol_at_put(_imcp_invoke_name, name); 1531 cp->symbol_at_put(_imcp_invoke_signature, signature); 1532 cp->set_has_preresolution(); 1533 cp->set_is_for_method_handle_intrinsic(); 1534 1535 // decide on access bits: public or not? 1536 u2 flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1537 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1538 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1539 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1540 1541 methodHandle m; 1542 { 1543 InlineTableSizes sizes; 1544 Method* m_oop = Method::allocate(loader_data, 0, 1545 accessFlags_from(flags_bits), &sizes, 1546 ConstMethod::NORMAL, 1547 name, 1548 CHECK_(empty)); 1549 m = methodHandle(THREAD, m_oop); 1550 } 1551 m->set_constants(cp()); 1552 m->set_name_index(_imcp_invoke_name); 1553 m->set_signature_index(_imcp_invoke_signature); 1554 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1555 assert(m->signature() == signature, ""); 1556 m->constMethod()->compute_from_signature(signature, must_be_static); 1557 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder())); 1558 assert(m->is_method_handle_intrinsic(), ""); 1559 #ifdef ASSERT 1560 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1561 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1562 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1563 #endif //ASSERT 1564 1565 // Finally, set up its entry points. 1566 assert(m->can_be_statically_bound(), ""); 1567 m->set_vtable_index(Method::nonvirtual_vtable_index); 1568 m->link_method(m, CHECK_(empty)); 1569 1570 if (iid == vmIntrinsics::_linkToNative) { 1571 m->set_interpreter_entry(m->adapter()->get_i2c_entry()); 1572 } 1573 if (log_is_enabled(Debug, methodhandles)) { 1574 LogTarget(Debug, methodhandles) lt; 1575 LogStream ls(lt); 1576 m->print_on(&ls); 1577 } 1578 1579 return m; 1580 } 1581 1582 #if INCLUDE_CDS 1583 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) { 1584 m->restore_adapter(CHECK); 1585 if (m->adapter() != nullptr) { 1586 m->adapter()->restore_unshareable_info(CHECK); 1587 m->set_from_compiled_entry(m->adapter()->get_c2i_entry()); 1588 } 1589 m->link_method(m, CHECK); 1590 1591 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) { 1592 m->set_interpreter_entry(m->adapter()->get_i2c_entry()); 1593 } 1594 } 1595 #endif 1596 1597 Klass* Method::check_non_bcp_klass(Klass* klass) { 1598 if (klass != nullptr && klass->class_loader() != nullptr) { 1599 if (klass->is_objArray_klass()) 1600 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1601 return klass; 1602 } 1603 return nullptr; 1604 } 1605 1606 1607 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, 1608 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1609 // Code below does not work for native methods - they should never get rewritten anyway 1610 assert(!m->is_native(), "cannot rewrite native methods"); 1611 // Allocate new Method* 1612 AccessFlags flags = m->access_flags(); 1613 1614 ConstMethod* cm = m->constMethod(); 1615 int checked_exceptions_len = cm->checked_exceptions_length(); 1616 int localvariable_len = cm->localvariable_table_length(); 1617 int exception_table_len = cm->exception_table_length(); 1618 int method_parameters_len = cm->method_parameters_length(); 1619 int method_annotations_len = cm->method_annotations_length(); 1620 int parameter_annotations_len = cm->parameter_annotations_length(); 1621 int type_annotations_len = cm->type_annotations_length(); 1622 int default_annotations_len = cm->default_annotations_length(); 1623 1624 InlineTableSizes sizes( 1625 localvariable_len, 1626 new_compressed_linenumber_size, 1627 exception_table_len, 1628 checked_exceptions_len, 1629 method_parameters_len, 1630 cm->generic_signature_index(), 1631 method_annotations_len, 1632 parameter_annotations_len, 1633 type_annotations_len, 1634 default_annotations_len, 1635 0); 1636 1637 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1638 Method* newm_oop = Method::allocate(loader_data, 1639 new_code_length, 1640 flags, 1641 &sizes, 1642 m->method_type(), 1643 m->name(), 1644 CHECK_(methodHandle())); 1645 methodHandle newm (THREAD, newm_oop); 1646 1647 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1648 ConstMethod* newcm = newm->constMethod(); 1649 int new_const_method_size = newm->constMethod()->size(); 1650 1651 // This works because the source and target are both Methods. Some compilers 1652 // (e.g., clang) complain that the target vtable pointer will be stomped, 1653 // so cast away newm()'s and m()'s Methodness. 1654 memcpy((void*)newm(), (void*)m(), sizeof(Method)); 1655 1656 // Create shallow copy of ConstMethod. 1657 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1658 1659 // Reset correct method/const method, method size, and parameter info 1660 newm->set_constMethod(newcm); 1661 newm->constMethod()->set_code_size(new_code_length); 1662 newm->constMethod()->set_constMethod_size(new_const_method_size); 1663 assert(newm->code_size() == new_code_length, "check"); 1664 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1665 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1666 assert(newm->exception_table_length() == exception_table_len, "check"); 1667 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1668 // Copy new byte codes 1669 memcpy(newm->code_base(), new_code, new_code_length); 1670 // Copy line number table 1671 if (new_compressed_linenumber_size > 0) { 1672 memcpy(newm->compressed_linenumber_table(), 1673 new_compressed_linenumber_table, 1674 new_compressed_linenumber_size); 1675 } 1676 // Copy method_parameters 1677 if (method_parameters_len > 0) { 1678 memcpy(newm->method_parameters_start(), 1679 m->method_parameters_start(), 1680 method_parameters_len * sizeof(MethodParametersElement)); 1681 } 1682 // Copy checked_exceptions 1683 if (checked_exceptions_len > 0) { 1684 memcpy(newm->checked_exceptions_start(), 1685 m->checked_exceptions_start(), 1686 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1687 } 1688 // Copy exception table 1689 if (exception_table_len > 0) { 1690 memcpy(newm->exception_table_start(), 1691 m->exception_table_start(), 1692 exception_table_len * sizeof(ExceptionTableElement)); 1693 } 1694 // Copy local variable number table 1695 if (localvariable_len > 0) { 1696 memcpy(newm->localvariable_table_start(), 1697 m->localvariable_table_start(), 1698 localvariable_len * sizeof(LocalVariableTableElement)); 1699 } 1700 // Copy stackmap table 1701 if (m->has_stackmap_table()) { 1702 int code_attribute_length = m->stackmap_data()->length(); 1703 Array<u1>* stackmap_data = 1704 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle())); 1705 memcpy((void*)stackmap_data->adr_at(0), 1706 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1707 newm->set_stackmap_data(stackmap_data); 1708 } 1709 1710 // copy annotations over to new method 1711 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle())); 1712 return newm; 1713 } 1714 1715 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) { 1716 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics 1717 // because we are not loading from core libraries 1718 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1719 // which does not use the class default class loader so we check for its loader here 1720 const InstanceKlass* ik = InstanceKlass::cast(holder); 1721 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1722 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here 1723 } 1724 1725 // see if the klass name is well-known: 1726 Symbol* klass_name = ik->name(); 1727 vmSymbolID id = vmSymbols::find_sid(klass_name); 1728 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) { 1729 return id; 1730 } else { 1731 return vmSymbolID::NO_SID; 1732 } 1733 } 1734 1735 void Method::init_intrinsic_id(vmSymbolID klass_id) { 1736 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once"); 1737 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1738 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1739 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1740 1741 // the klass name is well-known: 1742 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be"); 1743 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility"); 1744 1745 // ditto for method and signature: 1746 vmSymbolID name_id = vmSymbols::find_sid(name()); 1747 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1748 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1749 && name_id == vmSymbolID::NO_SID) { 1750 return; 1751 } 1752 vmSymbolID sig_id = vmSymbols::find_sid(signature()); 1753 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1754 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1755 && sig_id == vmSymbolID::NO_SID) { 1756 return; 1757 } 1758 1759 u2 flags = access_flags().as_method_flags(); 1760 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1761 if (id != vmIntrinsics::_none) { 1762 set_intrinsic_id(id); 1763 if (id == vmIntrinsics::_Class_cast) { 1764 // Even if the intrinsic is rejected, we want to inline this simple method. 1765 set_force_inline(); 1766 } 1767 return; 1768 } 1769 1770 // A few slightly irregular cases: 1771 switch (klass_id) { 1772 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1773 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1774 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1775 if (!is_native()) break; 1776 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1777 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1778 id = vmIntrinsics::_none; 1779 break; 1780 1781 default: 1782 break; 1783 } 1784 1785 if (id != vmIntrinsics::_none) { 1786 // Set up its iid. It is an alias method. 1787 set_intrinsic_id(id); 1788 return; 1789 } 1790 } 1791 1792 bool Method::load_signature_classes(const methodHandle& m, TRAPS) { 1793 if (!THREAD->can_call_java()) { 1794 // There is nothing useful this routine can do from within the Compile thread. 1795 // Hopefully, the signature contains only well-known classes. 1796 // We could scan for this and return true/false, but the caller won't care. 1797 return false; 1798 } 1799 bool sig_is_loaded = true; 1800 ResourceMark rm(THREAD); 1801 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) { 1802 if (ss.is_reference()) { 1803 // load everything, including arrays "[Lfoo;" 1804 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD); 1805 // We are loading classes eagerly. If a ClassNotFoundException or 1806 // a LinkageError was generated, be sure to ignore it. 1807 if (HAS_PENDING_EXCEPTION) { 1808 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) || 1809 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) { 1810 CLEAR_PENDING_EXCEPTION; 1811 } else { 1812 return false; 1813 } 1814 } 1815 if( klass == nullptr) { sig_is_loaded = false; } 1816 } 1817 } 1818 return sig_is_loaded; 1819 } 1820 1821 // Exposed so field engineers can debug VM 1822 void Method::print_short_name(outputStream* st) const { 1823 ResourceMark rm; 1824 #ifdef PRODUCT 1825 st->print(" %s::", method_holder()->external_name()); 1826 #else 1827 st->print(" %s::", method_holder()->internal_name()); 1828 #endif 1829 name()->print_symbol_on(st); 1830 if (WizardMode) signature()->print_symbol_on(st); 1831 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1832 MethodHandles::print_as_basic_type_signature_on(st, signature()); 1833 } 1834 1835 // Comparer for sorting an object array containing 1836 // Method*s. 1837 static int method_comparator(Method* a, Method* b) { 1838 return a->name()->fast_compare(b->name()); 1839 } 1840 1841 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1842 // default_methods also uses this without the ordering for fast find_method 1843 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) { 1844 int length = methods->length(); 1845 if (length > 1) { 1846 if (func == nullptr) { 1847 func = method_comparator; 1848 } 1849 { 1850 NoSafepointVerifier nsv; 1851 QuickSort::sort(methods->data(), length, func); 1852 } 1853 // Reset method ordering 1854 if (set_idnums) { 1855 for (u2 i = 0; i < length; i++) { 1856 Method* m = methods->at(i); 1857 m->set_method_idnum(i); 1858 m->set_orig_method_idnum(i); 1859 } 1860 } 1861 } 1862 } 1863 1864 //----------------------------------------------------------------------------------- 1865 // Non-product code unless JVM/TI needs it 1866 1867 #if !defined(PRODUCT) || INCLUDE_JVMTI 1868 class SignatureTypePrinter : public SignatureTypeNames { 1869 private: 1870 outputStream* _st; 1871 bool _use_separator; 1872 1873 void type_name(const char* name) { 1874 if (_use_separator) _st->print(", "); 1875 _st->print("%s", name); 1876 _use_separator = true; 1877 } 1878 1879 public: 1880 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1881 _st = st; 1882 _use_separator = false; 1883 } 1884 1885 void print_parameters() { _use_separator = false; do_parameters_on(this); } 1886 void print_returntype() { _use_separator = false; do_type(return_type()); } 1887 }; 1888 1889 1890 void Method::print_name(outputStream* st) const { 1891 Thread *thread = Thread::current(); 1892 ResourceMark rm(thread); 1893 st->print("%s ", is_static() ? "static" : "virtual"); 1894 if (WizardMode) { 1895 st->print("%s.", method_holder()->internal_name()); 1896 name()->print_symbol_on(st); 1897 signature()->print_symbol_on(st); 1898 } else { 1899 SignatureTypePrinter sig(signature(), st); 1900 sig.print_returntype(); 1901 st->print(" %s.", method_holder()->internal_name()); 1902 name()->print_symbol_on(st); 1903 st->print("("); 1904 sig.print_parameters(); 1905 st->print(")"); 1906 } 1907 } 1908 #endif // !PRODUCT || INCLUDE_JVMTI 1909 1910 1911 void Method::print_codes_on(outputStream* st, int flags) const { 1912 print_codes_on(0, code_size(), st, flags); 1913 } 1914 1915 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const { 1916 Thread *thread = Thread::current(); 1917 ResourceMark rm(thread); 1918 methodHandle mh (thread, (Method*)this); 1919 BytecodeTracer::print_method_codes(mh, from, to, st, flags); 1920 } 1921 1922 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1923 _bci = 0; 1924 _line = 0; 1925 }; 1926 1927 bool CompressedLineNumberReadStream::read_pair() { 1928 jubyte next = read_byte(); 1929 // Check for terminator 1930 if (next == 0) return false; 1931 if (next == 0xFF) { 1932 // Escape character, regular compression used 1933 _bci += read_signed_int(); 1934 _line += read_signed_int(); 1935 } else { 1936 // Single byte compression used 1937 _bci += next >> 3; 1938 _line += next & 0x7; 1939 } 1940 return true; 1941 } 1942 1943 #if INCLUDE_JVMTI 1944 1945 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1946 BreakpointInfo* bp = method_holder()->breakpoints(); 1947 for (; bp != nullptr; bp = bp->next()) { 1948 if (bp->match(this, bci)) { 1949 return bp->orig_bytecode(); 1950 } 1951 } 1952 { 1953 ResourceMark rm; 1954 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1955 } 1956 return Bytecodes::_shouldnotreachhere; 1957 } 1958 1959 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1960 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1961 BreakpointInfo* bp = method_holder()->breakpoints(); 1962 for (; bp != nullptr; bp = bp->next()) { 1963 if (bp->match(this, bci)) { 1964 bp->set_orig_bytecode(code); 1965 // and continue, in case there is more than one 1966 } 1967 } 1968 } 1969 1970 void Method::set_breakpoint(int bci) { 1971 InstanceKlass* ik = method_holder(); 1972 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1973 bp->set_next(ik->breakpoints()); 1974 ik->set_breakpoints(bp); 1975 // do this last: 1976 bp->set(this); 1977 } 1978 1979 static void clear_matches(Method* m, int bci) { 1980 InstanceKlass* ik = m->method_holder(); 1981 BreakpointInfo* prev_bp = nullptr; 1982 BreakpointInfo* next_bp; 1983 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) { 1984 next_bp = bp->next(); 1985 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1986 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1987 // do this first: 1988 bp->clear(m); 1989 // unhook it 1990 if (prev_bp != nullptr) 1991 prev_bp->set_next(next_bp); 1992 else 1993 ik->set_breakpoints(next_bp); 1994 delete bp; 1995 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1996 // at same location. So we have multiple matching (method_index and bci) 1997 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1998 // breakpoint for clear_breakpoint request and keep all other method versions 1999 // BreakpointInfo for future clear_breakpoint request. 2000 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 2001 // which is being called when class is unloaded. We delete all the Breakpoint 2002 // information for all versions of method. We may not correctly restore the original 2003 // bytecode in all method versions, but that is ok. Because the class is being unloaded 2004 // so these methods won't be used anymore. 2005 if (bci >= 0) { 2006 break; 2007 } 2008 } else { 2009 // This one is a keeper. 2010 prev_bp = bp; 2011 } 2012 } 2013 } 2014 2015 void Method::clear_breakpoint(int bci) { 2016 assert(bci >= 0, ""); 2017 clear_matches(this, bci); 2018 } 2019 2020 void Method::clear_all_breakpoints() { 2021 clear_matches(this, -1); 2022 } 2023 2024 #endif // INCLUDE_JVMTI 2025 2026 int Method::highest_osr_comp_level() const { 2027 const MethodCounters* mcs = method_counters(); 2028 if (mcs != nullptr) { 2029 return mcs->highest_osr_comp_level(); 2030 } else { 2031 return CompLevel_none; 2032 } 2033 } 2034 2035 void Method::set_highest_comp_level(int level) { 2036 MethodCounters* mcs = method_counters(); 2037 if (mcs != nullptr) { 2038 mcs->set_highest_comp_level(level); 2039 } 2040 } 2041 2042 void Method::set_highest_osr_comp_level(int level) { 2043 MethodCounters* mcs = method_counters(); 2044 if (mcs != nullptr) { 2045 mcs->set_highest_osr_comp_level(level); 2046 } 2047 } 2048 2049 #if INCLUDE_JVMTI 2050 2051 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 2052 _bci = bci; 2053 _name_index = m->name_index(); 2054 _signature_index = m->signature_index(); 2055 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 2056 if (_orig_bytecode == Bytecodes::_breakpoint) 2057 _orig_bytecode = m->orig_bytecode_at(_bci); 2058 _next = nullptr; 2059 } 2060 2061 void BreakpointInfo::set(Method* method) { 2062 #ifdef ASSERT 2063 { 2064 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 2065 if (code == Bytecodes::_breakpoint) 2066 code = method->orig_bytecode_at(_bci); 2067 assert(orig_bytecode() == code, "original bytecode must be the same"); 2068 } 2069 #endif 2070 Thread *thread = Thread::current(); 2071 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 2072 method->incr_number_of_breakpoints(thread); 2073 { 2074 // Deoptimize all dependents on this method 2075 HandleMark hm(thread); 2076 methodHandle mh(thread, method); 2077 CodeCache::mark_dependents_on_method_for_breakpoint(mh); 2078 } 2079 } 2080 2081 void BreakpointInfo::clear(Method* method) { 2082 *method->bcp_from(_bci) = orig_bytecode(); 2083 assert(method->number_of_breakpoints() > 0, "must not go negative"); 2084 method->decr_number_of_breakpoints(Thread::current()); 2085 } 2086 2087 #endif // INCLUDE_JVMTI 2088 2089 // jmethodID handling 2090 2091 // This is a block allocating object, sort of like JNIHandleBlock, only a 2092 // lot simpler. 2093 // It's allocated on the CHeap because once we allocate a jmethodID, we can 2094 // never get rid of it. 2095 2096 static const int min_block_size = 8; 2097 2098 class JNIMethodBlockNode : public CHeapObj<mtClass> { 2099 friend class JNIMethodBlock; 2100 Method** _methods; 2101 int _number_of_methods; 2102 int _top; 2103 JNIMethodBlockNode* _next; 2104 2105 public: 2106 2107 JNIMethodBlockNode(int num_methods = min_block_size); 2108 2109 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 2110 2111 void ensure_methods(int num_addl_methods) { 2112 if (_top < _number_of_methods) { 2113 num_addl_methods -= _number_of_methods - _top; 2114 if (num_addl_methods <= 0) { 2115 return; 2116 } 2117 } 2118 if (_next == nullptr) { 2119 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 2120 } else { 2121 _next->ensure_methods(num_addl_methods); 2122 } 2123 } 2124 }; 2125 2126 class JNIMethodBlock : public CHeapObj<mtClass> { 2127 JNIMethodBlockNode _head; 2128 JNIMethodBlockNode *_last_free; 2129 public: 2130 static Method* const _free_method; 2131 2132 JNIMethodBlock(int initial_capacity = min_block_size) 2133 : _head(initial_capacity), _last_free(&_head) {} 2134 2135 void ensure_methods(int num_addl_methods) { 2136 _last_free->ensure_methods(num_addl_methods); 2137 } 2138 2139 Method** add_method(Method* m) { 2140 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) { 2141 if (b->_top < b->_number_of_methods) { 2142 // top points to the next free entry. 2143 int i = b->_top; 2144 b->_methods[i] = m; 2145 b->_top++; 2146 _last_free = b; 2147 return &(b->_methods[i]); 2148 } else if (b->_top == b->_number_of_methods) { 2149 // if the next free entry ran off the block see if there's a free entry 2150 for (int i = 0; i < b->_number_of_methods; i++) { 2151 if (b->_methods[i] == _free_method) { 2152 b->_methods[i] = m; 2153 _last_free = b; 2154 return &(b->_methods[i]); 2155 } 2156 } 2157 // Only check each block once for frees. They're very unlikely. 2158 // Increment top past the end of the block. 2159 b->_top++; 2160 } 2161 // need to allocate a next block. 2162 if (b->_next == nullptr) { 2163 b->_next = _last_free = new JNIMethodBlockNode(); 2164 } 2165 } 2166 guarantee(false, "Should always allocate a free block"); 2167 return nullptr; 2168 } 2169 2170 bool contains(Method** m) { 2171 if (m == nullptr) return false; 2172 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2173 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2174 // This is a bit of extra checking, for two reasons. One is 2175 // that contains() deals with pointers that are passed in by 2176 // JNI code, so making sure that the pointer is aligned 2177 // correctly is valuable. The other is that <= and > are 2178 // technically not defined on pointers, so the if guard can 2179 // pass spuriously; no modern compiler is likely to make that 2180 // a problem, though (and if one did, the guard could also 2181 // fail spuriously, which would be bad). 2182 ptrdiff_t idx = m - b->_methods; 2183 if (b->_methods + idx == m) { 2184 return true; 2185 } 2186 } 2187 } 2188 return false; // not found 2189 } 2190 2191 // During class unloading the methods are cleared, which is different 2192 // than freed. 2193 void clear_all_methods() { 2194 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2195 for (int i = 0; i< b->_number_of_methods; i++) { 2196 b->_methods[i] = nullptr; 2197 } 2198 } 2199 } 2200 #ifndef PRODUCT 2201 int count_methods() { 2202 // count all allocated methods 2203 int count = 0; 2204 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2205 for (int i = 0; i< b->_number_of_methods; i++) { 2206 if (b->_methods[i] != _free_method) count++; 2207 } 2208 } 2209 return count; 2210 } 2211 #endif // PRODUCT 2212 }; 2213 2214 // Something that can't be mistaken for an address or a markWord 2215 Method* const JNIMethodBlock::_free_method = (Method*)55; 2216 2217 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) { 2218 _number_of_methods = MAX2(num_methods, min_block_size); 2219 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2220 for (int i = 0; i < _number_of_methods; i++) { 2221 _methods[i] = JNIMethodBlock::_free_method; 2222 } 2223 } 2224 2225 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) { 2226 // Have to add jmethod_ids() to class loader data thread-safely. 2227 // Also have to add the method to the list safely, which the lock 2228 // protects as well. 2229 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag); 2230 if (cld->jmethod_ids() == nullptr) { 2231 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2232 } else { 2233 cld->jmethod_ids()->ensure_methods(capacity); 2234 } 2235 } 2236 2237 // Add a method id to the jmethod_ids 2238 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) { 2239 // Have to add jmethod_ids() to class loader data thread-safely. 2240 // Also have to add the method to the list safely, which the lock 2241 // protects as well. 2242 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check"); 2243 2244 ResourceMark rm; 2245 log_debug(jmethod)("Creating jmethodID for Method %s", m->external_name()); 2246 if (cld->jmethod_ids() == nullptr) { 2247 cld->set_jmethod_ids(new JNIMethodBlock()); 2248 } 2249 // jmethodID is a pointer to Method* 2250 return (jmethodID)cld->jmethod_ids()->add_method(m); 2251 } 2252 2253 jmethodID Method::jmethod_id() { 2254 methodHandle mh(Thread::current(), this); 2255 return method_holder()->get_jmethod_id(mh); 2256 } 2257 2258 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2259 // Can't assert the method_holder is the same because the new method has the 2260 // scratch method holder. 2261 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2262 == new_method->method_holder()->class_loader() || 2263 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution 2264 "changing to a different class loader"); 2265 // Just change the method in place, jmethodID pointer doesn't change. 2266 *((Method**)jmid) = new_method; 2267 } 2268 2269 bool Method::is_method_id(jmethodID mid) { 2270 Method* m = resolve_jmethod_id(mid); 2271 assert(m != nullptr, "should be called with non-null method"); 2272 InstanceKlass* ik = m->method_holder(); 2273 ClassLoaderData* cld = ik->class_loader_data(); 2274 if (cld->jmethod_ids() == nullptr) return false; 2275 return (cld->jmethod_ids()->contains((Method**)mid)); 2276 } 2277 2278 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2279 if (mid == nullptr) return nullptr; 2280 Method* o = resolve_jmethod_id(mid); 2281 if (o == nullptr || o == JNIMethodBlock::_free_method) { 2282 return nullptr; 2283 } 2284 // Method should otherwise be valid. Assert for testing. 2285 assert(is_valid_method(o), "should be valid jmethodid"); 2286 // If the method's class holder object is unreferenced, but not yet marked as 2287 // unloaded, we need to return null here too because after a safepoint, its memory 2288 // will be reclaimed. 2289 return o->method_holder()->is_loader_alive() ? o : nullptr; 2290 }; 2291 2292 void Method::set_on_stack(const bool value) { 2293 // Set both the method itself and its constant pool. The constant pool 2294 // on stack means some method referring to it is also on the stack. 2295 constants()->set_on_stack(value); 2296 2297 bool already_set = on_stack_flag(); 2298 set_on_stack_flag(value); 2299 if (value && !already_set) { 2300 MetadataOnStackMark::record(this); 2301 } 2302 } 2303 2304 void Method::record_gc_epoch() { 2305 // If any method is on the stack in continuations, none of them can be reclaimed, 2306 // so save the marking cycle to check for the whole class in the cpCache. 2307 // The cpCache is writeable. 2308 constants()->cache()->record_gc_epoch(); 2309 } 2310 2311 // Called when the class loader is unloaded to make all methods weak. 2312 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2313 loader_data->jmethod_ids()->clear_all_methods(); 2314 } 2315 2316 void Method::clear_jmethod_id() { 2317 // Being at a safepoint prevents racing against other class redefinitions 2318 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); 2319 // The jmethodID is not stored in the Method instance, we need to look it up first 2320 jmethodID methodid = find_jmethod_id_or_null(); 2321 // We need to make sure that jmethodID actually resolves to this method 2322 // - multiple redefined versions may share jmethodID slots and if a method 2323 // has already been rewired to a newer version we could be removing reference 2324 // to a still existing method instance 2325 if (methodid != nullptr && *((Method**)methodid) == this) { 2326 *((Method**)methodid) = nullptr; 2327 } 2328 } 2329 2330 bool Method::has_method_vptr(const void* ptr) { 2331 Method m; 2332 // This assumes that the vtbl pointer is the first word of a C++ object. 2333 return dereference_vptr(&m) == dereference_vptr(ptr); 2334 } 2335 2336 // Check that this pointer is valid by checking that the vtbl pointer matches 2337 bool Method::is_valid_method(const Method* m) { 2338 if (m == nullptr) { 2339 return false; 2340 } else if ((intptr_t(m) & (wordSize-1)) != 0) { 2341 // Quick sanity check on pointer. 2342 return false; 2343 } else if (!os::is_readable_range(m, m + 1)) { 2344 return false; 2345 } else if (m->is_shared()) { 2346 return CppVtables::is_valid_shared_method(m); 2347 } else if (Metaspace::contains_non_shared(m)) { 2348 return has_method_vptr((const void*)m); 2349 } else { 2350 return false; 2351 } 2352 } 2353 2354 #ifndef PRODUCT 2355 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) { 2356 out->print("%d", loader_data->jmethod_ids()->count_methods()); 2357 } 2358 #endif // PRODUCT 2359 2360 2361 // Printing 2362 2363 #ifndef PRODUCT 2364 2365 void Method::print_on(outputStream* st) const { 2366 ResourceMark rm; 2367 assert(is_method(), "must be method"); 2368 st->print_cr("%s", internal_name()); 2369 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this)); 2370 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2371 st->print (" - constants: " PTR_FORMAT " ", p2i(constants())); 2372 constants()->print_value_on(st); st->cr(); 2373 st->print (" - access: 0x%x ", access_flags().as_method_flags()); access_flags().print_on(st); st->cr(); 2374 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr(); 2375 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2376 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2377 st->print_cr(" - max stack: %d", max_stack()); 2378 st->print_cr(" - max locals: %d", max_locals()); 2379 st->print_cr(" - size of params: %d", size_of_parameters()); 2380 st->print_cr(" - method size: %d", method_size()); 2381 if (intrinsic_id() != vmIntrinsics::_none) 2382 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id())); 2383 if (highest_comp_level() != CompLevel_none) 2384 st->print_cr(" - highest level: %d", highest_comp_level()); 2385 st->print_cr(" - vtable index: %d", _vtable_index); 2386 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry())); 2387 st->print( " - adapters: "); 2388 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2389 if (a == nullptr) 2390 st->print_cr(PTR_FORMAT, p2i(a)); 2391 else 2392 a->print_adapter_on(st); 2393 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry())); 2394 st->print_cr(" - code size: %d", code_size()); 2395 if (code_size() != 0) { 2396 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base())); 2397 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size())); 2398 } 2399 if (method_data() != nullptr) { 2400 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data())); 2401 } 2402 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2403 if (checked_exceptions_length() > 0) { 2404 CheckedExceptionElement* table = checked_exceptions_start(); 2405 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table)); 2406 if (Verbose) { 2407 for (int i = 0; i < checked_exceptions_length(); i++) { 2408 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2409 } 2410 } 2411 } 2412 if (has_linenumber_table()) { 2413 u_char* table = compressed_linenumber_table(); 2414 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table)); 2415 if (Verbose) { 2416 CompressedLineNumberReadStream stream(table); 2417 while (stream.read_pair()) { 2418 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2419 } 2420 } 2421 } 2422 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2423 if (localvariable_table_length() > 0) { 2424 LocalVariableTableElement* table = localvariable_table_start(); 2425 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table)); 2426 if (Verbose) { 2427 for (int i = 0; i < localvariable_table_length(); i++) { 2428 int bci = table[i].start_bci; 2429 int len = table[i].length; 2430 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2431 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2432 int slot = table[i].slot; 2433 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2434 } 2435 } 2436 } 2437 if (code() != nullptr) { 2438 st->print (" - compiled code: "); 2439 code()->print_value_on(st); 2440 } 2441 if (is_native()) { 2442 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function())); 2443 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler())); 2444 } 2445 } 2446 2447 void Method::print_linkage_flags(outputStream* st) { 2448 access_flags().print_on(st); 2449 if (is_default_method()) { 2450 st->print("default "); 2451 } 2452 if (is_overpass()) { 2453 st->print("overpass "); 2454 } 2455 } 2456 #endif //PRODUCT 2457 2458 void Method::print_value_on(outputStream* st) const { 2459 assert(is_method(), "must be method"); 2460 st->print("%s", internal_name()); 2461 print_address_on(st); 2462 st->print(" "); 2463 name()->print_value_on(st); 2464 st->print(" "); 2465 signature()->print_value_on(st); 2466 st->print(" in "); 2467 method_holder()->print_value_on(st); 2468 if (WizardMode) st->print("#%d", _vtable_index); 2469 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2470 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code()); 2471 } 2472 2473 // Verification 2474 2475 void Method::verify_on(outputStream* st) { 2476 guarantee(is_method(), "object must be method"); 2477 guarantee(constants()->is_constantPool(), "should be constant pool"); 2478 MethodData* md = method_data(); 2479 guarantee(md == nullptr || 2480 md->is_methodData(), "should be method data"); 2481 } --- EOF ---