1 /* 2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "cds/cdsConfig.hpp" 27 #include "cds/cppVtables.hpp" 28 #include "cds/metaspaceShared.hpp" 29 #include "classfile/classLoader.hpp" 30 #include "classfile/classLoaderDataGraph.hpp" 31 #include "classfile/metadataOnStackMark.hpp" 32 #include "classfile/symbolTable.hpp" 33 #include "classfile/systemDictionary.hpp" 34 #include "classfile/vmClasses.hpp" 35 #include "code/codeCache.hpp" 36 #include "code/debugInfoRec.hpp" 37 #include "compiler/compilationPolicy.hpp" 38 #include "gc/shared/collectedHeap.inline.hpp" 39 #include "interpreter/bytecodeStream.hpp" 40 #include "interpreter/bytecodeTracer.hpp" 41 #include "interpreter/bytecodes.hpp" 42 #include "interpreter/interpreter.hpp" 43 #include "interpreter/oopMapCache.hpp" 44 #include "logging/log.hpp" 45 #include "logging/logStream.hpp" 46 #include "logging/logTag.hpp" 47 #include "memory/allocation.inline.hpp" 48 #include "memory/metadataFactory.hpp" 49 #include "memory/metaspaceClosure.hpp" 50 #include "memory/oopFactory.hpp" 51 #include "memory/resourceArea.hpp" 52 #include "memory/universe.hpp" 53 #include "nmt/memTracker.hpp" 54 #include "oops/constMethod.hpp" 55 #include "oops/constantPool.hpp" 56 #include "oops/klass.inline.hpp" 57 #include "oops/method.inline.hpp" 58 #include "oops/methodData.hpp" 59 #include "oops/objArrayKlass.hpp" 60 #include "oops/objArrayOop.inline.hpp" 61 #include "oops/oop.inline.hpp" 62 #include "oops/symbol.hpp" 63 #include "oops/trainingData.hpp" 64 #include "prims/jvmtiExport.hpp" 65 #include "prims/methodHandles.hpp" 66 #include "runtime/atomic.hpp" 67 #include "runtime/arguments.hpp" 68 #include "runtime/continuationEntry.hpp" 69 #include "runtime/frame.inline.hpp" 70 #include "runtime/handles.inline.hpp" 71 #include "runtime/init.hpp" 72 #include "runtime/java.hpp" 73 #include "runtime/orderAccess.hpp" 74 #include "runtime/perfData.hpp" 75 #include "runtime/relocator.hpp" 76 #include "runtime/safepointVerifiers.hpp" 77 #include "runtime/sharedRuntime.hpp" 78 #include "runtime/signature.hpp" 79 #include "runtime/threads.hpp" 80 #include "runtime/vm_version.hpp" 81 #include "utilities/align.hpp" 82 #include "utilities/quickSort.hpp" 83 #include "utilities/vmError.hpp" 84 #include "utilities/xmlstream.hpp" 85 86 // Implementation of Method 87 88 Method* Method::allocate(ClassLoaderData* loader_data, 89 int byte_code_size, 90 AccessFlags access_flags, 91 InlineTableSizes* sizes, 92 ConstMethod::MethodType method_type, 93 Symbol* name, 94 TRAPS) { 95 assert(!access_flags.is_native() || byte_code_size == 0, 96 "native methods should not contain byte codes"); 97 ConstMethod* cm = ConstMethod::allocate(loader_data, 98 byte_code_size, 99 sizes, 100 method_type, 101 CHECK_NULL); 102 int size = Method::size(access_flags.is_native()); 103 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name); 104 } 105 106 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) { 107 NoSafepointVerifier no_safepoint; 108 set_constMethod(xconst); 109 set_access_flags(access_flags); 110 set_intrinsic_id(vmIntrinsics::_none); 111 clear_method_data(); 112 clear_method_counters(); 113 set_vtable_index(Method::garbage_vtable_index); 114 115 // Fix and bury in Method* 116 set_interpreter_entry(nullptr); // sets i2i entry and from_int 117 set_adapter_entry(nullptr); 118 Method::clear_code(); // from_c/from_i get set to c2i/i2i 119 120 if (access_flags.is_native()) { 121 clear_native_function(); 122 set_signature_handler(nullptr); 123 } 124 125 NOT_PRODUCT(set_compiled_invocation_count(0);) 126 // Name is very useful for debugging. 127 NOT_PRODUCT(_name = name;) 128 } 129 130 // Release Method*. The nmethod will be gone when we get here because 131 // we've walked the code cache. 132 void Method::deallocate_contents(ClassLoaderData* loader_data) { 133 MetadataFactory::free_metadata(loader_data, constMethod()); 134 set_constMethod(nullptr); 135 MetadataFactory::free_metadata(loader_data, method_data()); 136 clear_method_data(); 137 MetadataFactory::free_metadata(loader_data, method_counters()); 138 clear_method_counters(); 139 // The nmethod will be gone when we get here. 140 if (code() != nullptr) _code = nullptr; 141 } 142 143 void Method::release_C_heap_structures() { 144 if (method_data()) { 145 method_data()->release_C_heap_structures(); 146 147 // Destroy MethodData embedded lock 148 method_data()->~MethodData(); 149 } 150 } 151 152 address Method::get_i2c_entry() { 153 assert(adapter() != nullptr, "must have"); 154 return adapter()->get_i2c_entry(); 155 } 156 157 address Method::get_c2i_entry() { 158 assert(adapter() != nullptr, "must have"); 159 return adapter()->get_c2i_entry(); 160 } 161 162 address Method::get_c2i_unverified_entry() { 163 assert(adapter() != nullptr, "must have"); 164 return adapter()->get_c2i_unverified_entry(); 165 } 166 167 address Method::get_c2i_no_clinit_check_entry() { 168 assert(VM_Version::supports_fast_class_init_checks(), ""); 169 assert(adapter() != nullptr, "must have"); 170 return adapter()->get_c2i_no_clinit_check_entry(); 171 } 172 173 char* Method::name_and_sig_as_C_string() const { 174 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 175 } 176 177 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 178 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 179 } 180 181 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 182 const char* klass_name = klass->external_name(); 183 int klass_name_len = (int)strlen(klass_name); 184 int method_name_len = method_name->utf8_length(); 185 int len = klass_name_len + 2 + method_name_len + signature->utf8_length(); 186 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 187 strcpy(dest, klass_name); 188 dest[klass_name_len + 0] = ':'; 189 dest[klass_name_len + 1] = ':'; 190 strcpy(&dest[klass_name_len + 2], method_name->as_C_string()); 191 strcpy(&dest[klass_name_len + 2 + method_name_len], signature->as_C_string()); 192 dest[len] = 0; 193 return dest; 194 } 195 196 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 197 Symbol* klass_name = klass->name(); 198 klass_name->as_klass_external_name(buf, size); 199 int len = (int)strlen(buf); 200 201 if (len < size - 1) { 202 buf[len++] = '.'; 203 204 method_name->as_C_string(&(buf[len]), size - len); 205 len = (int)strlen(buf); 206 207 signature->as_C_string(&(buf[len]), size - len); 208 } 209 210 return buf; 211 } 212 213 const char* Method::external_name() const { 214 return external_name(constants()->pool_holder(), name(), signature()); 215 } 216 217 void Method::print_external_name(outputStream *os) const { 218 print_external_name(os, constants()->pool_holder(), name(), signature()); 219 } 220 221 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) { 222 stringStream ss; 223 print_external_name(&ss, klass, method_name, signature); 224 return ss.as_string(); 225 } 226 227 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) { 228 signature->print_as_signature_external_return_type(os); 229 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string()); 230 signature->print_as_signature_external_parameters(os); 231 os->print(")"); 232 } 233 234 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) { 235 if (log_is_enabled(Debug, exceptions)) { 236 ResourceMark rm(THREAD); 237 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"", 238 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string()); 239 } 240 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 241 // access exception table 242 ExceptionTable table(mh()); 243 int length = table.length(); 244 // iterate through all entries sequentially 245 constantPoolHandle pool(THREAD, mh->constants()); 246 for (int i = 0; i < length; i ++) { 247 //reacquire the table in case a GC happened 248 ExceptionTable table(mh()); 249 int beg_bci = table.start_pc(i); 250 int end_bci = table.end_pc(i); 251 assert(beg_bci <= end_bci, "inconsistent exception table"); 252 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d", 253 beg_bci, end_bci); 254 255 if (beg_bci <= throw_bci && throw_bci < end_bci) { 256 // exception handler bci range covers throw_bci => investigate further 257 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci); 258 259 int handler_bci = table.handler_pc(i); 260 int klass_index = table.catch_type_index(i); 261 if (klass_index == 0) { 262 if (log_is_enabled(Info, exceptions)) { 263 ResourceMark rm(THREAD); 264 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d", 265 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci); 266 } 267 return handler_bci; 268 } else if (ex_klass == nullptr) { 269 // Is this even possible? 270 if (log_is_enabled(Info, exceptions)) { 271 ResourceMark rm(THREAD); 272 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d", 273 mh()->name()->as_C_string(), handler_bci); 274 } 275 return handler_bci; 276 } else { 277 if (log_is_enabled(Debug, exceptions)) { 278 ResourceMark rm(THREAD); 279 log_debug(exceptions)(" - resolving catch type \"%s\"", 280 pool->klass_name_at(klass_index)->as_C_string()); 281 } 282 // we know the exception class => get the constraint class 283 // this may require loading of the constraint class; if verification 284 // fails or some other exception occurs, return handler_bci 285 Klass* k = pool->klass_at(klass_index, THREAD); 286 if (HAS_PENDING_EXCEPTION) { 287 if (log_is_enabled(Debug, exceptions)) { 288 ResourceMark rm(THREAD); 289 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type", 290 PENDING_EXCEPTION->klass()->external_name()); 291 } 292 return handler_bci; 293 } 294 assert(k != nullptr, "klass not loaded"); 295 if (ex_klass->is_subtype_of(k)) { 296 if (log_is_enabled(Info, exceptions)) { 297 ResourceMark rm(THREAD); 298 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d", 299 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci); 300 } 301 return handler_bci; 302 } 303 } 304 } 305 } 306 307 if (log_is_enabled(Debug, exceptions)) { 308 ResourceMark rm(THREAD); 309 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"", 310 ex_klass->external_name(), mh->name()->as_C_string()); 311 } 312 313 return -1; 314 } 315 316 void Method::mask_for(int bci, InterpreterOopMap* mask) { 317 methodHandle h_this(Thread::current(), this); 318 mask_for(h_this, bci, mask); 319 } 320 321 void Method::mask_for(const methodHandle& this_mh, int bci, InterpreterOopMap* mask) { 322 assert(this_mh() == this, "Sanity"); 323 method_holder()->mask_for(this_mh, bci, mask); 324 } 325 326 int Method::bci_from(address bcp) const { 327 if (is_native() && bcp == nullptr) { 328 return 0; 329 } 330 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code 331 // may call this after interrupting a nested ResourceMark. 332 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(), 333 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp)); 334 335 return int(bcp - code_base()); 336 } 337 338 339 int Method::validate_bci(int bci) const { 340 return (bci == 0 || 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(&_method_data); 403 it->push(&_method_counters); 404 NOT_PRODUCT(it->push(&_name);) 405 } 406 407 #if INCLUDE_CDS 408 // Attempt to return method to original state. Clear any pointers 409 // (to objects outside the shared spaces). We won't be able to predict 410 // where they should point in a new JVM. Further initialize some 411 // entries now in order allow them to be write protected later. 412 413 void Method::remove_unshareable_info() { 414 unlink_method(); 415 if (method_data() != nullptr) { 416 method_data()->remove_unshareable_info(); 417 } 418 if (method_counters() != nullptr) { 419 method_counters()->remove_unshareable_info(); 420 } 421 JFR_ONLY(REMOVE_METHOD_ID(this);) 422 } 423 424 void Method::restore_unshareable_info(TRAPS) { 425 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored"); 426 if (method_data() != nullptr) { 427 method_data()->restore_unshareable_info(CHECK); 428 } 429 if (method_counters() != nullptr) { 430 method_counters()->restore_unshareable_info(CHECK); 431 } 432 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set"); 433 assert(!pending_queue_processed(), "method's pending_queued_processed flag should not be set"); 434 } 435 #endif 436 437 void Method::set_vtable_index(int index) { 438 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) { 439 // At runtime initialize_vtable is rerun as part of link_class_impl() 440 // for a shared class loaded by the non-boot loader to obtain the loader 441 // constraints based on the runtime classloaders' context. 442 return; // don't write into the shared class 443 } else { 444 _vtable_index = index; 445 } 446 } 447 448 void Method::set_itable_index(int index) { 449 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) { 450 // At runtime initialize_itable is rerun as part of link_class_impl() 451 // for a shared class loaded by the non-boot loader to obtain the loader 452 // constraints based on the runtime classloaders' context. The dumptime 453 // itable index should be the same as the runtime index. 454 assert(_vtable_index == itable_index_max - index, 455 "archived itable index is different from runtime index"); 456 return; // don’t write into the shared class 457 } else { 458 _vtable_index = itable_index_max - index; 459 } 460 assert(valid_itable_index(), ""); 461 } 462 463 // The RegisterNatives call being attempted tried to register with a method that 464 // is not native. Ask JVM TI what prefixes have been specified. Then check 465 // to see if the native method is now wrapped with the prefixes. See the 466 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details. 467 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) { 468 #if INCLUDE_JVMTI 469 ResourceMark rm(THREAD); 470 Method* method; 471 int name_len = name->utf8_length(); 472 char* name_str = name->as_utf8(); 473 int prefix_count; 474 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count); 475 for (int i = 0; i < prefix_count; i++) { 476 char* prefix = prefixes[i]; 477 int prefix_len = (int)strlen(prefix); 478 479 // try adding this prefix to the method name and see if it matches another method name 480 int trial_len = name_len + prefix_len; 481 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1); 482 strcpy(trial_name_str, prefix); 483 strcat(trial_name_str, name_str); 484 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len); 485 if (trial_name == nullptr) { 486 continue; // no such symbol, so this prefix wasn't used, try the next prefix 487 } 488 method = k->lookup_method(trial_name, signature); 489 if (method == nullptr) { 490 continue; // signature doesn't match, try the next prefix 491 } 492 if (method->is_native()) { 493 method->set_is_prefixed_native(); 494 return method; // wahoo, we found a prefixed version of the method, return it 495 } 496 // found as non-native, so prefix is good, add it, probably just need more prefixes 497 name_len = trial_len; 498 name_str = trial_name_str; 499 } 500 #endif // INCLUDE_JVMTI 501 return nullptr; // not found 502 } 503 504 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) { 505 Method* method = k->lookup_method(name, signature); 506 if (method == nullptr) { 507 ResourceMark rm(THREAD); 508 stringStream st; 509 st.print("Method '"); 510 print_external_name(&st, k, name, signature); 511 st.print("' name or signature does not match"); 512 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false); 513 } 514 if (!method->is_native()) { 515 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es) 516 method = find_prefixed_native(k, name, signature, THREAD); 517 if (method == nullptr) { 518 ResourceMark rm(THREAD); 519 stringStream st; 520 st.print("Method '"); 521 print_external_name(&st, k, name, signature); 522 st.print("' is not declared as native"); 523 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false); 524 } 525 } 526 527 if (entry != nullptr) { 528 method->set_native_function(entry, native_bind_event_is_interesting); 529 } else { 530 method->clear_native_function(); 531 } 532 if (log_is_enabled(Debug, jni, resolve)) { 533 ResourceMark rm(THREAD); 534 log_debug(jni, resolve)("[Registering JNI native method %s.%s]", 535 method->method_holder()->external_name(), 536 method->name()->as_C_string()); 537 } 538 return true; 539 } 540 541 bool Method::was_executed_more_than(int n) { 542 // Invocation counter is reset when the Method* is compiled. 543 // If the method has compiled code we therefore assume it has 544 // be executed more than n times. 545 if (is_accessor() || is_empty_method() || (code() != nullptr)) { 546 // interpreter doesn't bump invocation counter of trivial methods 547 // compiler does not bump invocation counter of compiled methods 548 return true; 549 } 550 else if ((method_counters() != nullptr && 551 method_counters()->invocation_counter()->carry()) || 552 (method_data() != nullptr && 553 method_data()->invocation_counter()->carry())) { 554 // The carry bit is set when the counter overflows and causes 555 // a compilation to occur. We don't know how many times 556 // the counter has been reset, so we simply assume it has 557 // been executed more than n times. 558 return true; 559 } else { 560 return invocation_count() > n; 561 } 562 } 563 564 void Method::print_invocation_count(outputStream* st) { 565 //---< compose+print method return type, klass, name, and signature >--- 566 if (is_static()) { st->print("static "); } 567 if (is_final()) { st->print("final "); } 568 if (is_synchronized()) { st->print("synchronized "); } 569 if (is_native()) { st->print("native "); } 570 st->print("%s::", method_holder()->external_name()); 571 name()->print_symbol_on(st); 572 signature()->print_symbol_on(st); 573 574 if (WizardMode) { 575 // dump the size of the byte codes 576 st->print(" {%d}", code_size()); 577 } 578 st->cr(); 579 580 // Counting based on signed int counters tends to overflow with 581 // longer-running workloads on fast machines. The counters under 582 // consideration here, however, are limited in range by counting 583 // logic. See InvocationCounter:count_limit for example. 584 // No "overflow precautions" need to be implemented here. 585 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count()); 586 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count()); 587 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count()); 588 589 if (method_data() != nullptr) { 590 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count()); 591 } 592 593 #ifndef PRODUCT 594 if (CountCompiledCalls) { 595 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count()); 596 } 597 #endif 598 } 599 600 MethodTrainingData* Method::training_data_or_null() const { 601 MethodCounters* mcs = method_counters(); 602 if (mcs == nullptr) { 603 return nullptr; 604 } else { 605 return mcs->method_training_data(); 606 } 607 } 608 609 bool Method::init_training_data(MethodTrainingData* tdata) { 610 MethodCounters* mcs = method_counters(); 611 if (mcs == nullptr) { 612 return false; 613 } else { 614 return mcs->init_method_training_data(tdata); 615 } 616 } 617 618 bool Method::install_training_method_data(const methodHandle& method) { 619 MethodTrainingData* mtd = MethodTrainingData::find(method); 620 if (mtd != nullptr && mtd->has_holder() && mtd->final_profile() != nullptr && 621 mtd->holder() == method() && mtd->final_profile()->method() == method()) { // FIXME 622 Atomic::replace_if_null(&method->_method_data, mtd->final_profile()); 623 return true; 624 } 625 return false; 626 } 627 628 // Build a MethodData* object to hold profiling information collected on this 629 // method when requested. 630 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) { 631 if (install_training_method_data(method)) { 632 return; 633 } 634 // Do not profile the method if metaspace has hit an OOM previously 635 // allocating profiling data. Callers clear pending exception so don't 636 // add one here. 637 if (ClassLoaderDataGraph::has_metaspace_oom()) { 638 return; 639 } 640 641 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 642 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 643 if (HAS_PENDING_EXCEPTION) { 644 CompileBroker::log_metaspace_failure(); 645 ClassLoaderDataGraph::set_metaspace_oom(true); 646 return; // return the exception (which is cleared) 647 } 648 649 if (!Atomic::replace_if_null(&method->_method_data, method_data)) { 650 MetadataFactory::free_metadata(loader_data, method_data); 651 return; 652 } 653 654 /* 655 LogStreamHandle(Info, mdo) lsh; 656 if (lsh.is_enabled()) { 657 ResourceMark rm(THREAD); 658 lsh.print("build_profiling_method_data for "); 659 method->print_name(&lsh); 660 lsh.cr(); 661 } 662 */ 663 if (ForceProfiling && TrainingData::need_data()) { 664 MethodTrainingData* mtd = MethodTrainingData::make(method, false); 665 guarantee(mtd != nullptr, ""); 666 } 667 if (PrintMethodData) { 668 ResourceMark rm(THREAD); 669 tty->print("build_profiling_method_data for "); 670 method->print_name(tty); 671 tty->cr(); 672 // At the end of the run, the MDO, full of data, will be dumped. 673 } 674 } 675 676 MethodCounters* Method::build_method_counters(Thread* current, Method* m) { 677 // Do not profile the method if metaspace has hit an OOM previously 678 if (ClassLoaderDataGraph::has_metaspace_oom()) { 679 return nullptr; 680 } 681 682 methodHandle mh(current, m); 683 MethodCounters* counters; 684 if (current->is_Java_thread()) { 685 JavaThread* THREAD = JavaThread::cast(current); // For exception macros. 686 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold 687 // if needed. 688 counters = MethodCounters::allocate_with_exception(mh, THREAD); 689 if (HAS_PENDING_EXCEPTION) { 690 CLEAR_PENDING_EXCEPTION; 691 } 692 } else { 693 // Call metaspace allocation that doesn't throw exception if the 694 // current thread isn't a JavaThread, ie. the VMThread. 695 counters = MethodCounters::allocate_no_exception(mh); 696 } 697 698 if (counters == nullptr) { 699 CompileBroker::log_metaspace_failure(); 700 ClassLoaderDataGraph::set_metaspace_oom(true); 701 return nullptr; 702 } 703 704 if (!mh->init_method_counters(counters)) { 705 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 706 } 707 708 if (ForceProfiling && TrainingData::need_data()) { 709 MethodTrainingData* mtd = MethodTrainingData::make(mh, false); 710 guarantee(mtd != nullptr, ""); 711 } 712 713 return mh->method_counters(); 714 } 715 716 bool Method::init_method_counters(MethodCounters* counters) { 717 // Try to install a pointer to MethodCounters, return true on success. 718 return Atomic::replace_if_null(&_method_counters, counters); 719 } 720 721 void Method::set_exception_handler_entered(int handler_bci) { 722 if (ProfileExceptionHandlers) { 723 MethodData* mdo = method_data(); 724 if (mdo != nullptr) { 725 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci); 726 handler_data.set_exception_handler_entered(); 727 } 728 } 729 } 730 731 int Method::extra_stack_words() { 732 // not an inline function, to avoid a header dependency on Interpreter 733 return extra_stack_entries() * Interpreter::stackElementSize; 734 } 735 736 bool Method::compute_has_loops_flag() { 737 BytecodeStream bcs(methodHandle(Thread::current(), this)); 738 Bytecodes::Code bc; 739 740 while ((bc = bcs.next()) >= 0) { 741 switch (bc) { 742 case Bytecodes::_ifeq: 743 case Bytecodes::_ifnull: 744 case Bytecodes::_iflt: 745 case Bytecodes::_ifle: 746 case Bytecodes::_ifne: 747 case Bytecodes::_ifnonnull: 748 case Bytecodes::_ifgt: 749 case Bytecodes::_ifge: 750 case Bytecodes::_if_icmpeq: 751 case Bytecodes::_if_icmpne: 752 case Bytecodes::_if_icmplt: 753 case Bytecodes::_if_icmpgt: 754 case Bytecodes::_if_icmple: 755 case Bytecodes::_if_icmpge: 756 case Bytecodes::_if_acmpeq: 757 case Bytecodes::_if_acmpne: 758 case Bytecodes::_goto: 759 case Bytecodes::_jsr: 760 if (bcs.dest() < bcs.next_bci()) { 761 return set_has_loops(); 762 } 763 break; 764 765 case Bytecodes::_goto_w: 766 case Bytecodes::_jsr_w: 767 if (bcs.dest_w() < bcs.next_bci()) { 768 return set_has_loops(); 769 } 770 break; 771 772 case Bytecodes::_lookupswitch: { 773 Bytecode_lookupswitch lookupswitch(this, bcs.bcp()); 774 if (lookupswitch.default_offset() < 0) { 775 return set_has_loops(); 776 } else { 777 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) { 778 LookupswitchPair pair = lookupswitch.pair_at(i); 779 if (pair.offset() < 0) { 780 return set_has_loops(); 781 } 782 } 783 } 784 break; 785 } 786 case Bytecodes::_tableswitch: { 787 Bytecode_tableswitch tableswitch(this, bcs.bcp()); 788 if (tableswitch.default_offset() < 0) { 789 return set_has_loops(); 790 } else { 791 for (int i = 0; i < tableswitch.length(); ++i) { 792 if (tableswitch.dest_offset_at(i) < 0) { 793 return set_has_loops(); 794 } 795 } 796 } 797 break; 798 } 799 default: 800 break; 801 } 802 } 803 804 _flags.set_has_loops_flag_init(true); 805 return false; 806 } 807 808 bool Method::is_final_method(AccessFlags class_access_flags) const { 809 // or "does_not_require_vtable_entry" 810 // default method or overpass can occur, is not final (reuses vtable entry) 811 // private methods in classes get vtable entries for backward class compatibility. 812 if (is_overpass() || is_default_method()) return false; 813 return is_final() || class_access_flags.is_final(); 814 } 815 816 bool Method::is_final_method() const { 817 return is_final_method(method_holder()->access_flags()); 818 } 819 820 bool Method::is_default_method() const { 821 if (method_holder() != nullptr && 822 method_holder()->is_interface() && 823 !is_abstract() && !is_private()) { 824 return true; 825 } else { 826 return false; 827 } 828 } 829 830 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 831 if (is_final_method(class_access_flags)) return true; 832 #ifdef ASSERT 833 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 834 if (class_access_flags.is_interface()) { 835 ResourceMark rm; 836 assert(is_nonv == is_static() || is_nonv == is_private(), 837 "nonvirtual unexpected for non-static, non-private: %s", 838 name_and_sig_as_C_string()); 839 } 840 #endif 841 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 842 return vtable_index() == nonvirtual_vtable_index; 843 } 844 845 bool Method::can_be_statically_bound() const { 846 return can_be_statically_bound(method_holder()->access_flags()); 847 } 848 849 bool Method::can_be_statically_bound(InstanceKlass* context) const { 850 return (method_holder() == context) && can_be_statically_bound(); 851 } 852 853 /** 854 * Returns false if this is one of specially treated methods for 855 * which we have to provide stack trace in throw in compiled code. 856 * Returns true otherwise. 857 */ 858 bool Method::can_omit_stack_trace() { 859 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) { 860 return false; // All methods in sun.invoke.util.ValueConversions 861 } 862 return true; 863 } 864 865 bool Method::is_accessor() const { 866 return is_getter() || is_setter(); 867 } 868 869 bool Method::is_getter() const { 870 if (code_size() != 5) return false; 871 if (size_of_parameters() != 1) return false; 872 if (java_code_at(0) != Bytecodes::_aload_0) return false; 873 if (java_code_at(1) != Bytecodes::_getfield) return false; 874 switch (java_code_at(4)) { 875 case Bytecodes::_ireturn: 876 case Bytecodes::_lreturn: 877 case Bytecodes::_freturn: 878 case Bytecodes::_dreturn: 879 case Bytecodes::_areturn: 880 break; 881 default: 882 return false; 883 } 884 return true; 885 } 886 887 bool Method::is_setter() const { 888 if (code_size() != 6) return false; 889 if (java_code_at(0) != Bytecodes::_aload_0) return false; 890 switch (java_code_at(1)) { 891 case Bytecodes::_iload_1: 892 case Bytecodes::_aload_1: 893 case Bytecodes::_fload_1: 894 if (size_of_parameters() != 2) return false; 895 break; 896 case Bytecodes::_dload_1: 897 case Bytecodes::_lload_1: 898 if (size_of_parameters() != 3) return false; 899 break; 900 default: 901 return false; 902 } 903 if (java_code_at(2) != Bytecodes::_putfield) return false; 904 if (java_code_at(5) != Bytecodes::_return) return false; 905 return true; 906 } 907 908 bool Method::is_constant_getter() const { 909 int last_index = code_size() - 1; 910 // Check if the first 1-3 bytecodes are a constant push 911 // and the last bytecode is a return. 912 return (2 <= code_size() && code_size() <= 4 && 913 Bytecodes::is_const(java_code_at(0)) && 914 Bytecodes::length_for(java_code_at(0)) == last_index && 915 Bytecodes::is_return(java_code_at(last_index))); 916 } 917 918 bool Method::is_initializer() const { 919 return is_object_initializer() || is_static_initializer(); 920 } 921 922 bool Method::has_valid_initializer_flags() const { 923 return (is_static() || 924 method_holder()->major_version() < 51); 925 } 926 927 bool Method::is_static_initializer() const { 928 // For classfiles version 51 or greater, ensure that the clinit method is 929 // static. Non-static methods with the name "<clinit>" are not static 930 // initializers. (older classfiles exempted for backward compatibility) 931 return name() == vmSymbols::class_initializer_name() && 932 has_valid_initializer_flags(); 933 } 934 935 bool Method::is_object_initializer() const { 936 return name() == vmSymbols::object_initializer_name(); 937 } 938 939 bool Method::needs_clinit_barrier() const { 940 return is_static() && !method_holder()->is_initialized(); 941 } 942 943 bool Method::code_has_clinit_barriers() const { 944 nmethod* nm = code(); 945 return (nm != nullptr) && nm->has_clinit_barriers(); 946 } 947 948 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 949 int length = method->checked_exceptions_length(); 950 if (length == 0) { // common case 951 return objArrayHandle(THREAD, Universe::the_empty_class_array()); 952 } else { 953 methodHandle h_this(THREAD, method); 954 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle())); 955 objArrayHandle mirrors (THREAD, m_oop); 956 for (int i = 0; i < length; i++) { 957 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 958 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 959 if (log_is_enabled(Warning, exceptions) && 960 !k->is_subclass_of(vmClasses::Throwable_klass())) { 961 ResourceMark rm(THREAD); 962 log_warning(exceptions)( 963 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable", 964 k->external_name(), method->external_name()); 965 } 966 mirrors->obj_at_put(i, k->java_mirror()); 967 } 968 return mirrors; 969 } 970 }; 971 972 973 int Method::line_number_from_bci(int bci) const { 974 int best_bci = 0; 975 int best_line = -1; 976 if (bci == SynchronizationEntryBCI) bci = 0; 977 if (0 <= bci && bci < code_size() && has_linenumber_table()) { 978 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 979 // Not necessarily sorted and not necessarily one-to-one. 980 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 981 while (stream.read_pair()) { 982 if (stream.bci() == bci) { 983 // perfect match 984 return stream.line(); 985 } else { 986 // update best_bci/line 987 if (stream.bci() < bci && stream.bci() >= best_bci) { 988 best_bci = stream.bci(); 989 best_line = stream.line(); 990 } 991 } 992 } 993 } 994 return best_line; 995 } 996 997 998 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 999 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 1000 Thread *thread = Thread::current(); 1001 Symbol* klass_name = constants()->klass_name_at(klass_index); 1002 Handle loader(thread, method_holder()->class_loader()); 1003 Handle prot (thread, method_holder()->protection_domain()); 1004 return SystemDictionary::find_instance_klass(thread, klass_name, loader, prot) != nullptr; 1005 } else { 1006 return true; 1007 } 1008 } 1009 1010 1011 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const { 1012 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc); 1013 if (must_be_resolved) { 1014 // Make sure klass is resolved in constantpool. 1015 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 1016 } 1017 return is_klass_loaded_by_klass_index(klass_index); 1018 } 1019 1020 1021 void Method::set_native_function(address function, bool post_event_flag) { 1022 assert(function != nullptr, "use clear_native_function to unregister natives"); 1023 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 1024 address* native_function = native_function_addr(); 1025 1026 // We can see racers trying to place the same native function into place. Once 1027 // is plenty. 1028 address current = *native_function; 1029 if (current == function) return; 1030 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 1031 function != nullptr) { 1032 // native_method_throw_unsatisfied_link_error_entry() should only 1033 // be passed when post_event_flag is false. 1034 assert(function != 1035 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1036 "post_event_flag mismatch"); 1037 1038 // post the bind event, and possible change the bind function 1039 JvmtiExport::post_native_method_bind(this, &function); 1040 } 1041 *native_function = function; 1042 // This function can be called more than once. We must make sure that we always 1043 // use the latest registered method -> check if a stub already has been generated. 1044 // If so, we have to make it not_entrant. 1045 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 1046 if (nm != nullptr) { 1047 nm->make_not_entrant(); 1048 } 1049 } 1050 1051 1052 bool Method::has_native_function() const { 1053 if (is_special_native_intrinsic()) 1054 return false; // special-cased in SharedRuntime::generate_native_wrapper 1055 address func = native_function(); 1056 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 1057 } 1058 1059 1060 void Method::clear_native_function() { 1061 // Note: is_method_handle_intrinsic() is allowed here. 1062 set_native_function( 1063 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1064 !native_bind_event_is_interesting); 1065 this->unlink_code(); 1066 } 1067 1068 1069 void Method::set_signature_handler(address handler) { 1070 address* signature_handler = signature_handler_addr(); 1071 *signature_handler = handler; 1072 } 1073 1074 1075 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 1076 assert(reason != nullptr, "must provide a reason"); 1077 if (PrintCompilation && report) { 1078 ttyLocker ttyl; 1079 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 1080 if (comp_level == CompLevel_all) { 1081 tty->print("all levels "); 1082 } else { 1083 tty->print("level %d ", comp_level); 1084 } 1085 this->print_short_name(tty); 1086 int size = this->code_size(); 1087 if (size > 0) { 1088 tty->print(" (%d bytes)", size); 1089 } 1090 if (reason != nullptr) { 1091 tty->print(" %s", reason); 1092 } 1093 tty->cr(); 1094 } 1095 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) { 1096 ttyLocker ttyl; 1097 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 1098 os::current_thread_id(), is_osr, comp_level); 1099 if (reason != nullptr) { 1100 xtty->print(" reason=\'%s\'", reason); 1101 } 1102 xtty->method(this); 1103 xtty->stamp(); 1104 xtty->end_elem(); 1105 } 1106 } 1107 1108 bool Method::is_always_compilable() const { 1109 // Generated adapters must be compiled 1110 if (is_special_native_intrinsic() && is_synthetic()) { 1111 assert(!is_not_c1_compilable(), "sanity check"); 1112 assert(!is_not_c2_compilable(), "sanity check"); 1113 return true; 1114 } 1115 1116 return false; 1117 } 1118 1119 bool Method::is_not_compilable(int comp_level) const { 1120 if (number_of_breakpoints() > 0) 1121 return true; 1122 if (is_always_compilable()) 1123 return false; 1124 if (comp_level == CompLevel_any) 1125 return is_not_c1_compilable() && is_not_c2_compilable(); 1126 if (is_c1_compile(comp_level)) 1127 return is_not_c1_compilable(); 1128 if (is_c2_compile(comp_level)) 1129 return is_not_c2_compilable(); 1130 return false; 1131 } 1132 1133 // call this when compiler finds that this method is not compilable 1134 void Method::set_not_compilable(const char* reason, int comp_level, bool report) { 1135 if (is_always_compilable()) { 1136 // Don't mark a method which should be always compilable 1137 return; 1138 } 1139 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 1140 if (comp_level == CompLevel_all) { 1141 set_is_not_c1_compilable(); 1142 set_is_not_c2_compilable(); 1143 } else { 1144 if (is_c1_compile(comp_level)) 1145 set_is_not_c1_compilable(); 1146 if (is_c2_compile(comp_level)) 1147 set_is_not_c2_compilable(); 1148 } 1149 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check"); 1150 } 1151 1152 bool Method::is_not_osr_compilable(int comp_level) const { 1153 if (is_not_compilable(comp_level)) 1154 return true; 1155 if (comp_level == CompLevel_any) 1156 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable(); 1157 if (is_c1_compile(comp_level)) 1158 return is_not_c1_osr_compilable(); 1159 if (is_c2_compile(comp_level)) 1160 return is_not_c2_osr_compilable(); 1161 return false; 1162 } 1163 1164 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) { 1165 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 1166 if (comp_level == CompLevel_all) { 1167 set_is_not_c1_osr_compilable(); 1168 set_is_not_c2_osr_compilable(); 1169 } else { 1170 if (is_c1_compile(comp_level)) 1171 set_is_not_c1_osr_compilable(); 1172 if (is_c2_compile(comp_level)) 1173 set_is_not_c2_osr_compilable(); 1174 } 1175 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check"); 1176 } 1177 1178 // Revert to using the interpreter and clear out the nmethod 1179 void Method::clear_code() { 1180 // this may be null if c2i adapters have not been made yet 1181 // Only should happen at allocate time. 1182 if (adapter() == nullptr) { 1183 _from_compiled_entry = nullptr; 1184 } else { 1185 _from_compiled_entry = adapter()->get_c2i_entry(); 1186 } 1187 OrderAccess::storestore(); 1188 _from_interpreted_entry = _i2i_entry; 1189 OrderAccess::storestore(); 1190 _code = nullptr; 1191 } 1192 1193 void Method::unlink_code(nmethod *compare) { 1194 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag); 1195 // We need to check if either the _code or _from_compiled_code_entry_point 1196 // refer to this nmethod because there is a race in setting these two fields 1197 // in Method* as seen in bugid 4947125. 1198 if (code() == compare || 1199 from_compiled_entry() == compare->verified_entry_point()) { 1200 clear_code(); 1201 } 1202 } 1203 1204 void Method::unlink_code() { 1205 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag); 1206 clear_code(); 1207 } 1208 1209 #if INCLUDE_CDS 1210 // Called by class data sharing to remove any entry points (which are not shared) 1211 void Method::unlink_method() { 1212 assert(CDSConfig::is_dumping_archive(), "sanity"); 1213 _code = nullptr; 1214 _adapter = nullptr; 1215 _i2i_entry = nullptr; 1216 _from_compiled_entry = nullptr; 1217 _from_interpreted_entry = nullptr; 1218 1219 if (is_native()) { 1220 *native_function_addr() = nullptr; 1221 set_signature_handler(nullptr); 1222 } 1223 NOT_PRODUCT(set_compiled_invocation_count(0);) 1224 1225 clear_method_data(); 1226 clear_method_counters(); 1227 clear_is_not_c1_compilable(); 1228 clear_is_not_c1_osr_compilable(); 1229 clear_is_not_c2_compilable(); 1230 clear_is_not_c2_osr_compilable(); 1231 clear_queued_for_compilation(); 1232 set_pending_queue_processed(false); 1233 remove_unshareable_flags(); 1234 } 1235 1236 void Method::remove_unshareable_flags() { 1237 // clear all the flags that shouldn't be in the archived version 1238 assert(!is_old(), "must be"); 1239 assert(!is_obsolete(), "must be"); 1240 assert(!is_deleted(), "must be"); 1241 1242 set_is_prefixed_native(false); 1243 set_queued_for_compilation(false); 1244 set_pending_queue_processed(false); 1245 set_is_not_c2_compilable(false); 1246 set_is_not_c1_compilable(false); 1247 set_is_not_c2_osr_compilable(false); 1248 set_on_stack_flag(false); 1249 } 1250 #endif 1251 1252 // Called when the method_holder is getting linked. Setup entrypoints so the method 1253 // is ready to be called from interpreter, compiler, and vtables. 1254 void Method::link_method(const methodHandle& h_method, TRAPS) { 1255 if (log_is_enabled(Info, perf, class, link)) { 1256 ClassLoader::perf_ik_link_methods_count()->inc(); 1257 } 1258 1259 // If the code cache is full, we may reenter this function for the 1260 // leftover methods that weren't linked. 1261 if (adapter() != nullptr) { 1262 return; 1263 } 1264 assert( _code == nullptr, "nothing compiled yet" ); 1265 1266 // Setup interpreter entrypoint 1267 assert(this == h_method(), "wrong h_method()" ); 1268 1269 assert(adapter() == nullptr, "init'd to null"); 1270 address entry = Interpreter::entry_for_method(h_method); 1271 assert(entry != nullptr, "interpreter entry must be non-null"); 1272 // Sets both _i2i_entry and _from_interpreted_entry 1273 set_interpreter_entry(entry); 1274 1275 // Don't overwrite already registered native entries. 1276 if (is_native() && !has_native_function()) { 1277 set_native_function( 1278 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1279 !native_bind_event_is_interesting); 1280 } 1281 1282 // Setup compiler entrypoint. This is made eagerly, so we do not need 1283 // special handling of vtables. An alternative is to make adapters more 1284 // lazily by calling make_adapter() from from_compiled_entry() for the 1285 // normal calls. For vtable calls life gets more complicated. When a 1286 // call-site goes mega-morphic we need adapters in all methods which can be 1287 // called from the vtable. We need adapters on such methods that get loaded 1288 // later. Ditto for mega-morphic itable calls. If this proves to be a 1289 // problem we'll make these lazily later. 1290 (void) make_adapters(h_method, CHECK); 1291 1292 // ONLY USE the h_method now as make_adapter may have blocked 1293 1294 if (h_method->is_continuation_native_intrinsic()) { 1295 _from_interpreted_entry = nullptr; 1296 _from_compiled_entry = nullptr; 1297 _i2i_entry = nullptr; 1298 if (Continuations::enabled()) { 1299 assert(!Threads::is_vm_complete(), "should only be called during vm init"); 1300 AdapterHandlerLibrary::create_native_wrapper(h_method); 1301 if (!h_method->has_compiled_code()) { 1302 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small"); 1303 } 1304 assert(_from_interpreted_entry == get_i2c_entry(), "invariant"); 1305 } 1306 } 1307 if (_preload_code != nullptr) { 1308 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag); 1309 set_code(h_method, _preload_code); 1310 assert(((nmethod*)_preload_code)->scc_entry() == _scc_entry, "sanity"); 1311 } 1312 } 1313 1314 address Method::make_adapters(const methodHandle& mh, TRAPS) { 1315 PerfTraceElapsedTime timer(ClassLoader::perf_method_adapters_time()); 1316 1317 // Adapters for compiled code are made eagerly here. They are fairly 1318 // small (generally < 100 bytes) and quick to make (and cached and shared) 1319 // so making them eagerly shouldn't be too expensive. 1320 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1321 if (adapter == nullptr ) { 1322 if (!is_init_completed()) { 1323 // Don't throw exceptions during VM initialization because java.lang.* classes 1324 // might not have been initialized, causing problems when constructing the 1325 // Java exception object. 1326 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1327 } else { 1328 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters"); 1329 } 1330 } 1331 1332 mh->set_adapter_entry(adapter); 1333 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1334 return adapter->get_c2i_entry(); 1335 } 1336 1337 // The verified_code_entry() must be called when a invoke is resolved 1338 // on this method. 1339 1340 // It returns the compiled code entry point, after asserting not null. 1341 // This function is called after potential safepoints so that nmethod 1342 // or adapter that it points to is still live and valid. 1343 // This function must not hit a safepoint! 1344 address Method::verified_code_entry() { 1345 debug_only(NoSafepointVerifier nsv;) 1346 assert(_from_compiled_entry != nullptr, "must be set"); 1347 return _from_compiled_entry; 1348 } 1349 1350 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1351 // (could be racing a deopt). 1352 // Not inline to avoid circular ref. 1353 bool Method::check_code() const { 1354 // cached in a register or local. There's a race on the value of the field. 1355 nmethod *code = Atomic::load_acquire(&_code); 1356 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method()); 1357 } 1358 1359 // Install compiled code. Instantly it can execute. 1360 void Method::set_code(const methodHandle& mh, nmethod *code) { 1361 assert_lock_strong(NMethodState_lock); 1362 assert( code, "use clear_code to remove code" ); 1363 assert( mh->check_code(), "" ); 1364 1365 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!"); 1366 1367 // These writes must happen in this order, because the interpreter will 1368 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1369 // which jumps to _from_compiled_entry. 1370 mh->_code = code; // Assign before allowing compiled code to exec 1371 1372 int comp_level = code->comp_level(); 1373 // In theory there could be a race here. In practice it is unlikely 1374 // and not worth worrying about. 1375 if (comp_level > mh->highest_comp_level()) { 1376 mh->set_highest_comp_level(comp_level); 1377 } 1378 1379 OrderAccess::storestore(); 1380 mh->_from_compiled_entry = code->verified_entry_point(); 1381 OrderAccess::storestore(); 1382 1383 if (mh->is_continuation_native_intrinsic()) { 1384 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method 1385 1386 if (mh->is_continuation_enter_intrinsic()) { 1387 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted 1388 mh->_i2i_entry = ContinuationEntry::interpreted_entry(); 1389 } else if (mh->is_continuation_yield_intrinsic()) { 1390 mh->_i2i_entry = mh->get_i2c_entry(); 1391 } else { 1392 guarantee(false, "Unknown Continuation native intrinsic"); 1393 } 1394 // This must come last, as it is what's tested in LinkResolver::resolve_static_call 1395 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry()); 1396 } else if (!mh->is_method_handle_intrinsic()) { 1397 // Instantly compiled code can execute. 1398 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1399 } 1400 } 1401 1402 1403 bool Method::is_overridden_in(Klass* k) const { 1404 InstanceKlass* ik = InstanceKlass::cast(k); 1405 1406 if (ik->is_interface()) return false; 1407 1408 // If method is an interface, we skip it - except if it 1409 // is a miranda method 1410 if (method_holder()->is_interface()) { 1411 // Check that method is not a miranda method 1412 if (ik->lookup_method(name(), signature()) == nullptr) { 1413 // No implementation exist - so miranda method 1414 return false; 1415 } 1416 return true; 1417 } 1418 1419 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1420 if (!has_vtable_index()) { 1421 return false; 1422 } else { 1423 Method* vt_m = ik->method_at_vtable(vtable_index()); 1424 return vt_m != this; 1425 } 1426 } 1427 1428 1429 // give advice about whether this Method* should be cached or not 1430 bool Method::should_not_be_cached() const { 1431 if (is_old()) { 1432 // This method has been redefined. It is either EMCP or obsolete 1433 // and we don't want to cache it because that would pin the method 1434 // down and prevent it from being collectible if and when it 1435 // finishes executing. 1436 return true; 1437 } 1438 1439 // caching this method should be just fine 1440 return false; 1441 } 1442 1443 1444 /** 1445 * Returns true if this is one of the specially treated methods for 1446 * security related stack walks (like Reflection.getCallerClass). 1447 */ 1448 bool Method::is_ignored_by_security_stack_walk() const { 1449 if (intrinsic_id() == vmIntrinsics::_invoke) { 1450 // This is Method.invoke() -- ignore it 1451 return true; 1452 } 1453 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) { 1454 // This is an auxiliary frame -- ignore it 1455 return true; 1456 } 1457 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1458 // This is an internal adapter frame for method handles -- ignore it 1459 return true; 1460 } 1461 return false; 1462 } 1463 1464 1465 // Constant pool structure for invoke methods: 1466 enum { 1467 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1468 _imcp_invoke_signature, // utf8: (variable Symbol*) 1469 _imcp_limit 1470 }; 1471 1472 // Test if this method is an MH adapter frame generated by Java code. 1473 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1474 bool Method::is_compiled_lambda_form() const { 1475 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1476 } 1477 1478 // Test if this method is an internal MH primitive method. 1479 bool Method::is_method_handle_intrinsic() const { 1480 vmIntrinsics::ID iid = intrinsic_id(); 1481 return (MethodHandles::is_signature_polymorphic(iid) && 1482 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1483 } 1484 1485 bool Method::has_member_arg() const { 1486 vmIntrinsics::ID iid = intrinsic_id(); 1487 return (MethodHandles::is_signature_polymorphic(iid) && 1488 MethodHandles::has_member_arg(iid)); 1489 } 1490 1491 // Make an instance of a signature-polymorphic internal MH primitive. 1492 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1493 Symbol* signature, 1494 TRAPS) { 1495 ResourceMark rm(THREAD); 1496 methodHandle empty; 1497 1498 InstanceKlass* holder = vmClasses::MethodHandle_klass(); 1499 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1500 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1501 1502 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1503 1504 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1505 name->increment_refcount(); 1506 signature->increment_refcount(); 1507 1508 int cp_length = _imcp_limit; 1509 ClassLoaderData* loader_data = holder->class_loader_data(); 1510 constantPoolHandle cp; 1511 { 1512 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1513 cp = constantPoolHandle(THREAD, cp_oop); 1514 } 1515 cp->copy_fields(holder->constants()); 1516 cp->set_pool_holder(holder); 1517 cp->symbol_at_put(_imcp_invoke_name, name); 1518 cp->symbol_at_put(_imcp_invoke_signature, signature); 1519 cp->set_has_preresolution(); 1520 cp->set_is_for_method_handle_intrinsic(); 1521 1522 // decide on access bits: public or not? 1523 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1524 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1525 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1526 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1527 1528 methodHandle m; 1529 { 1530 InlineTableSizes sizes; 1531 Method* m_oop = Method::allocate(loader_data, 0, 1532 accessFlags_from(flags_bits), &sizes, 1533 ConstMethod::NORMAL, 1534 name, 1535 CHECK_(empty)); 1536 m = methodHandle(THREAD, m_oop); 1537 } 1538 m->set_constants(cp()); 1539 m->set_name_index(_imcp_invoke_name); 1540 m->set_signature_index(_imcp_invoke_signature); 1541 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1542 assert(m->signature() == signature, ""); 1543 m->constMethod()->compute_from_signature(signature, must_be_static); 1544 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder())); 1545 assert(m->is_method_handle_intrinsic(), ""); 1546 #ifdef ASSERT 1547 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1548 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1549 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1550 #endif //ASSERT 1551 1552 // Finally, set up its entry points. 1553 assert(m->can_be_statically_bound(), ""); 1554 m->set_vtable_index(Method::nonvirtual_vtable_index); 1555 m->link_method(m, CHECK_(empty)); 1556 1557 if (iid == vmIntrinsics::_linkToNative) { 1558 m->set_interpreter_entry(m->adapter()->get_i2c_entry()); 1559 } 1560 if (log_is_enabled(Debug, methodhandles)) { 1561 LogTarget(Debug, methodhandles) lt; 1562 LogStream ls(lt); 1563 m->print_on(&ls); 1564 } 1565 1566 return m; 1567 } 1568 1569 #if INCLUDE_CDS 1570 void Method::restore_archived_method_handle_intrinsic(methodHandle m, TRAPS) { 1571 m->link_method(m, CHECK); 1572 1573 if (m->intrinsic_id() == vmIntrinsics::_linkToNative) { 1574 m->set_interpreter_entry(m->adapter()->get_i2c_entry()); 1575 } 1576 } 1577 #endif 1578 1579 Klass* Method::check_non_bcp_klass(Klass* klass) { 1580 if (klass != nullptr && klass->class_loader() != nullptr) { 1581 if (klass->is_objArray_klass()) 1582 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1583 return klass; 1584 } 1585 return nullptr; 1586 } 1587 1588 1589 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, 1590 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1591 // Code below does not work for native methods - they should never get rewritten anyway 1592 assert(!m->is_native(), "cannot rewrite native methods"); 1593 // Allocate new Method* 1594 AccessFlags flags = m->access_flags(); 1595 1596 ConstMethod* cm = m->constMethod(); 1597 int checked_exceptions_len = cm->checked_exceptions_length(); 1598 int localvariable_len = cm->localvariable_table_length(); 1599 int exception_table_len = cm->exception_table_length(); 1600 int method_parameters_len = cm->method_parameters_length(); 1601 int method_annotations_len = cm->method_annotations_length(); 1602 int parameter_annotations_len = cm->parameter_annotations_length(); 1603 int type_annotations_len = cm->type_annotations_length(); 1604 int default_annotations_len = cm->default_annotations_length(); 1605 1606 InlineTableSizes sizes( 1607 localvariable_len, 1608 new_compressed_linenumber_size, 1609 exception_table_len, 1610 checked_exceptions_len, 1611 method_parameters_len, 1612 cm->generic_signature_index(), 1613 method_annotations_len, 1614 parameter_annotations_len, 1615 type_annotations_len, 1616 default_annotations_len, 1617 0); 1618 1619 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1620 Method* newm_oop = Method::allocate(loader_data, 1621 new_code_length, 1622 flags, 1623 &sizes, 1624 m->method_type(), 1625 m->name(), 1626 CHECK_(methodHandle())); 1627 methodHandle newm (THREAD, newm_oop); 1628 1629 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1630 ConstMethod* newcm = newm->constMethod(); 1631 int new_const_method_size = newm->constMethod()->size(); 1632 1633 // This works because the source and target are both Methods. Some compilers 1634 // (e.g., clang) complain that the target vtable pointer will be stomped, 1635 // so cast away newm()'s and m()'s Methodness. 1636 memcpy((void*)newm(), (void*)m(), sizeof(Method)); 1637 1638 // Create shallow copy of ConstMethod. 1639 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1640 1641 // Reset correct method/const method, method size, and parameter info 1642 newm->set_constMethod(newcm); 1643 newm->constMethod()->set_code_size(new_code_length); 1644 newm->constMethod()->set_constMethod_size(new_const_method_size); 1645 assert(newm->code_size() == new_code_length, "check"); 1646 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1647 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1648 assert(newm->exception_table_length() == exception_table_len, "check"); 1649 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1650 // Copy new byte codes 1651 memcpy(newm->code_base(), new_code, new_code_length); 1652 // Copy line number table 1653 if (new_compressed_linenumber_size > 0) { 1654 memcpy(newm->compressed_linenumber_table(), 1655 new_compressed_linenumber_table, 1656 new_compressed_linenumber_size); 1657 } 1658 // Copy method_parameters 1659 if (method_parameters_len > 0) { 1660 memcpy(newm->method_parameters_start(), 1661 m->method_parameters_start(), 1662 method_parameters_len * sizeof(MethodParametersElement)); 1663 } 1664 // Copy checked_exceptions 1665 if (checked_exceptions_len > 0) { 1666 memcpy(newm->checked_exceptions_start(), 1667 m->checked_exceptions_start(), 1668 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1669 } 1670 // Copy exception table 1671 if (exception_table_len > 0) { 1672 memcpy(newm->exception_table_start(), 1673 m->exception_table_start(), 1674 exception_table_len * sizeof(ExceptionTableElement)); 1675 } 1676 // Copy local variable number table 1677 if (localvariable_len > 0) { 1678 memcpy(newm->localvariable_table_start(), 1679 m->localvariable_table_start(), 1680 localvariable_len * sizeof(LocalVariableTableElement)); 1681 } 1682 // Copy stackmap table 1683 if (m->has_stackmap_table()) { 1684 int code_attribute_length = m->stackmap_data()->length(); 1685 Array<u1>* stackmap_data = 1686 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle())); 1687 memcpy((void*)stackmap_data->adr_at(0), 1688 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1689 newm->set_stackmap_data(stackmap_data); 1690 } 1691 1692 // copy annotations over to new method 1693 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle())); 1694 return newm; 1695 } 1696 1697 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) { 1698 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics 1699 // because we are not loading from core libraries 1700 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1701 // which does not use the class default class loader so we check for its loader here 1702 const InstanceKlass* ik = InstanceKlass::cast(holder); 1703 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1704 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here 1705 } 1706 1707 // see if the klass name is well-known: 1708 Symbol* klass_name = ik->name(); 1709 vmSymbolID id = vmSymbols::find_sid(klass_name); 1710 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) { 1711 return id; 1712 } else { 1713 return vmSymbolID::NO_SID; 1714 } 1715 } 1716 1717 void Method::init_intrinsic_id(vmSymbolID klass_id) { 1718 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once"); 1719 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1720 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1721 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1722 1723 // the klass name is well-known: 1724 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be"); 1725 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility"); 1726 1727 // ditto for method and signature: 1728 vmSymbolID name_id = vmSymbols::find_sid(name()); 1729 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1730 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1731 && name_id == vmSymbolID::NO_SID) { 1732 return; 1733 } 1734 vmSymbolID sig_id = vmSymbols::find_sid(signature()); 1735 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1736 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1737 && sig_id == vmSymbolID::NO_SID) { 1738 return; 1739 } 1740 jshort flags = access_flags().as_short(); 1741 1742 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1743 if (id != vmIntrinsics::_none) { 1744 set_intrinsic_id(id); 1745 if (id == vmIntrinsics::_Class_cast) { 1746 // Even if the intrinsic is rejected, we want to inline this simple method. 1747 set_force_inline(); 1748 } 1749 return; 1750 } 1751 1752 // A few slightly irregular cases: 1753 switch (klass_id) { 1754 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1755 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1756 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1757 if (!is_native()) break; 1758 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1759 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1760 id = vmIntrinsics::_none; 1761 break; 1762 1763 default: 1764 break; 1765 } 1766 1767 if (id != vmIntrinsics::_none) { 1768 // Set up its iid. It is an alias method. 1769 set_intrinsic_id(id); 1770 return; 1771 } 1772 } 1773 1774 bool Method::load_signature_classes(const methodHandle& m, TRAPS) { 1775 if (!THREAD->can_call_java()) { 1776 // There is nothing useful this routine can do from within the Compile thread. 1777 // Hopefully, the signature contains only well-known classes. 1778 // We could scan for this and return true/false, but the caller won't care. 1779 return false; 1780 } 1781 bool sig_is_loaded = true; 1782 ResourceMark rm(THREAD); 1783 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) { 1784 if (ss.is_reference()) { 1785 // load everything, including arrays "[Lfoo;" 1786 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD); 1787 // We are loading classes eagerly. If a ClassNotFoundException or 1788 // a LinkageError was generated, be sure to ignore it. 1789 if (HAS_PENDING_EXCEPTION) { 1790 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) || 1791 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) { 1792 CLEAR_PENDING_EXCEPTION; 1793 } else { 1794 return false; 1795 } 1796 } 1797 if( klass == nullptr) { sig_is_loaded = false; } 1798 } 1799 } 1800 return sig_is_loaded; 1801 } 1802 1803 // Exposed so field engineers can debug VM 1804 void Method::print_short_name(outputStream* st) const { 1805 ResourceMark rm; 1806 #ifdef PRODUCT 1807 st->print(" %s::", method_holder()->external_name()); 1808 #else 1809 st->print(" %s::", method_holder()->internal_name()); 1810 #endif 1811 name()->print_symbol_on(st); 1812 if (WizardMode) signature()->print_symbol_on(st); 1813 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1814 MethodHandles::print_as_basic_type_signature_on(st, signature()); 1815 } 1816 1817 // Comparer for sorting an object array containing 1818 // Method*s. 1819 static int method_comparator(Method* a, Method* b) { 1820 return a->name()->fast_compare(b->name()); 1821 } 1822 1823 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1824 // default_methods also uses this without the ordering for fast find_method 1825 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) { 1826 int length = methods->length(); 1827 if (length > 1) { 1828 if (func == nullptr) { 1829 func = method_comparator; 1830 } 1831 { 1832 NoSafepointVerifier nsv; 1833 QuickSort::sort(methods->data(), length, func); 1834 } 1835 // Reset method ordering 1836 if (set_idnums) { 1837 for (u2 i = 0; i < length; i++) { 1838 Method* m = methods->at(i); 1839 m->set_method_idnum(i); 1840 m->set_orig_method_idnum(i); 1841 } 1842 } 1843 } 1844 } 1845 1846 //----------------------------------------------------------------------------------- 1847 // Non-product code unless JVM/TI needs it 1848 1849 #if !defined(PRODUCT) || INCLUDE_JVMTI 1850 class SignatureTypePrinter : public SignatureTypeNames { 1851 private: 1852 outputStream* _st; 1853 bool _use_separator; 1854 1855 void type_name(const char* name) { 1856 if (_use_separator) _st->print(", "); 1857 _st->print("%s", name); 1858 _use_separator = true; 1859 } 1860 1861 public: 1862 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1863 _st = st; 1864 _use_separator = false; 1865 } 1866 1867 void print_parameters() { _use_separator = false; do_parameters_on(this); } 1868 void print_returntype() { _use_separator = false; do_type(return_type()); } 1869 }; 1870 1871 1872 void Method::print_name(outputStream* st) const { 1873 Thread *thread = Thread::current(); 1874 ResourceMark rm(thread); 1875 st->print("%s ", is_static() ? "static" : "virtual"); 1876 if (WizardMode) { 1877 st->print("%s.", method_holder()->internal_name()); 1878 name()->print_symbol_on(st); 1879 signature()->print_symbol_on(st); 1880 } else { 1881 SignatureTypePrinter sig(signature(), st); 1882 sig.print_returntype(); 1883 st->print(" %s.", method_holder()->internal_name()); 1884 name()->print_symbol_on(st); 1885 st->print("("); 1886 sig.print_parameters(); 1887 st->print(")"); 1888 } 1889 } 1890 #endif // !PRODUCT || INCLUDE_JVMTI 1891 1892 1893 void Method::print_codes_on(outputStream* st, int flags) const { 1894 print_codes_on(0, code_size(), st, flags); 1895 } 1896 1897 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const { 1898 Thread *thread = Thread::current(); 1899 ResourceMark rm(thread); 1900 methodHandle mh (thread, (Method*)this); 1901 BytecodeTracer::print_method_codes(mh, from, to, st, flags); 1902 } 1903 1904 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1905 _bci = 0; 1906 _line = 0; 1907 }; 1908 1909 bool CompressedLineNumberReadStream::read_pair() { 1910 jubyte next = read_byte(); 1911 // Check for terminator 1912 if (next == 0) return false; 1913 if (next == 0xFF) { 1914 // Escape character, regular compression used 1915 _bci += read_signed_int(); 1916 _line += read_signed_int(); 1917 } else { 1918 // Single byte compression used 1919 _bci += next >> 3; 1920 _line += next & 0x7; 1921 } 1922 return true; 1923 } 1924 1925 #if INCLUDE_JVMTI 1926 1927 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1928 BreakpointInfo* bp = method_holder()->breakpoints(); 1929 for (; bp != nullptr; bp = bp->next()) { 1930 if (bp->match(this, bci)) { 1931 return bp->orig_bytecode(); 1932 } 1933 } 1934 { 1935 ResourceMark rm; 1936 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1937 } 1938 return Bytecodes::_shouldnotreachhere; 1939 } 1940 1941 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1942 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1943 BreakpointInfo* bp = method_holder()->breakpoints(); 1944 for (; bp != nullptr; bp = bp->next()) { 1945 if (bp->match(this, bci)) { 1946 bp->set_orig_bytecode(code); 1947 // and continue, in case there is more than one 1948 } 1949 } 1950 } 1951 1952 void Method::set_breakpoint(int bci) { 1953 InstanceKlass* ik = method_holder(); 1954 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1955 bp->set_next(ik->breakpoints()); 1956 ik->set_breakpoints(bp); 1957 // do this last: 1958 bp->set(this); 1959 } 1960 1961 static void clear_matches(Method* m, int bci) { 1962 InstanceKlass* ik = m->method_holder(); 1963 BreakpointInfo* prev_bp = nullptr; 1964 BreakpointInfo* next_bp; 1965 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) { 1966 next_bp = bp->next(); 1967 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1968 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1969 // do this first: 1970 bp->clear(m); 1971 // unhook it 1972 if (prev_bp != nullptr) 1973 prev_bp->set_next(next_bp); 1974 else 1975 ik->set_breakpoints(next_bp); 1976 delete bp; 1977 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1978 // at same location. So we have multiple matching (method_index and bci) 1979 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1980 // breakpoint for clear_breakpoint request and keep all other method versions 1981 // BreakpointInfo for future clear_breakpoint request. 1982 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1983 // which is being called when class is unloaded. We delete all the Breakpoint 1984 // information for all versions of method. We may not correctly restore the original 1985 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1986 // so these methods won't be used anymore. 1987 if (bci >= 0) { 1988 break; 1989 } 1990 } else { 1991 // This one is a keeper. 1992 prev_bp = bp; 1993 } 1994 } 1995 } 1996 1997 void Method::clear_breakpoint(int bci) { 1998 assert(bci >= 0, ""); 1999 clear_matches(this, bci); 2000 } 2001 2002 void Method::clear_all_breakpoints() { 2003 clear_matches(this, -1); 2004 } 2005 2006 #endif // INCLUDE_JVMTI 2007 2008 int Method::invocation_count() const { 2009 MethodCounters* mcs = method_counters(); 2010 MethodData* mdo = method_data(); 2011 if (((mcs != nullptr) ? mcs->invocation_counter()->carry() : false) || 2012 ((mdo != nullptr) ? mdo->invocation_counter()->carry() : false)) { 2013 return InvocationCounter::count_limit; 2014 } else { 2015 return ((mcs != nullptr) ? mcs->invocation_counter()->count() : 0) + 2016 ((mdo != nullptr) ? mdo->invocation_counter()->count() : 0); 2017 } 2018 } 2019 2020 int Method::backedge_count() const { 2021 MethodCounters* mcs = method_counters(); 2022 MethodData* mdo = method_data(); 2023 if (((mcs != nullptr) ? mcs->backedge_counter()->carry() : false) || 2024 ((mdo != nullptr) ? mdo->backedge_counter()->carry() : false)) { 2025 return InvocationCounter::count_limit; 2026 } else { 2027 return ((mcs != nullptr) ? mcs->backedge_counter()->count() : 0) + 2028 ((mdo != nullptr) ? mdo->backedge_counter()->count() : 0); 2029 } 2030 } 2031 2032 int Method::highest_comp_level() const { 2033 const MethodCounters* mcs = method_counters(); 2034 nmethod* nm = code(); 2035 int level = (nm != nullptr) ? nm->comp_level() : CompLevel_none; 2036 if (mcs != nullptr) { 2037 return MAX2(mcs->highest_comp_level(), level); 2038 } else { 2039 return CompLevel_none; 2040 } 2041 } 2042 2043 int Method::highest_osr_comp_level() const { 2044 const MethodCounters* mcs = method_counters(); 2045 if (mcs != nullptr) { 2046 return mcs->highest_osr_comp_level(); 2047 } else { 2048 return CompLevel_none; 2049 } 2050 } 2051 2052 void Method::set_highest_comp_level(int level) { 2053 MethodCounters* mcs = method_counters(); 2054 if (mcs != nullptr) { 2055 mcs->set_highest_comp_level(level); 2056 } 2057 } 2058 2059 void Method::set_highest_osr_comp_level(int level) { 2060 MethodCounters* mcs = method_counters(); 2061 if (mcs != nullptr) { 2062 mcs->set_highest_osr_comp_level(level); 2063 } 2064 } 2065 2066 #if INCLUDE_JVMTI 2067 2068 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 2069 _bci = bci; 2070 _name_index = m->name_index(); 2071 _signature_index = m->signature_index(); 2072 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 2073 if (_orig_bytecode == Bytecodes::_breakpoint) 2074 _orig_bytecode = m->orig_bytecode_at(_bci); 2075 _next = nullptr; 2076 } 2077 2078 void BreakpointInfo::set(Method* method) { 2079 #ifdef ASSERT 2080 { 2081 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 2082 if (code == Bytecodes::_breakpoint) 2083 code = method->orig_bytecode_at(_bci); 2084 assert(orig_bytecode() == code, "original bytecode must be the same"); 2085 } 2086 #endif 2087 Thread *thread = Thread::current(); 2088 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 2089 method->incr_number_of_breakpoints(thread); 2090 { 2091 // Deoptimize all dependents on this method 2092 HandleMark hm(thread); 2093 methodHandle mh(thread, method); 2094 CodeCache::mark_dependents_on_method_for_breakpoint(mh); 2095 } 2096 } 2097 2098 void BreakpointInfo::clear(Method* method) { 2099 *method->bcp_from(_bci) = orig_bytecode(); 2100 assert(method->number_of_breakpoints() > 0, "must not go negative"); 2101 method->decr_number_of_breakpoints(Thread::current()); 2102 } 2103 2104 #endif // INCLUDE_JVMTI 2105 2106 // jmethodID handling 2107 2108 // This is a block allocating object, sort of like JNIHandleBlock, only a 2109 // lot simpler. 2110 // It's allocated on the CHeap because once we allocate a jmethodID, we can 2111 // never get rid of it. 2112 2113 static const int min_block_size = 8; 2114 2115 class JNIMethodBlockNode : public CHeapObj<mtClass> { 2116 friend class JNIMethodBlock; 2117 Method** _methods; 2118 int _number_of_methods; 2119 int _top; 2120 JNIMethodBlockNode* _next; 2121 2122 public: 2123 2124 JNIMethodBlockNode(int num_methods = min_block_size); 2125 2126 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 2127 2128 void ensure_methods(int num_addl_methods) { 2129 if (_top < _number_of_methods) { 2130 num_addl_methods -= _number_of_methods - _top; 2131 if (num_addl_methods <= 0) { 2132 return; 2133 } 2134 } 2135 if (_next == nullptr) { 2136 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 2137 } else { 2138 _next->ensure_methods(num_addl_methods); 2139 } 2140 } 2141 }; 2142 2143 class JNIMethodBlock : public CHeapObj<mtClass> { 2144 JNIMethodBlockNode _head; 2145 JNIMethodBlockNode *_last_free; 2146 public: 2147 static Method* const _free_method; 2148 2149 JNIMethodBlock(int initial_capacity = min_block_size) 2150 : _head(initial_capacity), _last_free(&_head) {} 2151 2152 void ensure_methods(int num_addl_methods) { 2153 _last_free->ensure_methods(num_addl_methods); 2154 } 2155 2156 Method** add_method(Method* m) { 2157 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) { 2158 if (b->_top < b->_number_of_methods) { 2159 // top points to the next free entry. 2160 int i = b->_top; 2161 b->_methods[i] = m; 2162 b->_top++; 2163 _last_free = b; 2164 return &(b->_methods[i]); 2165 } else if (b->_top == b->_number_of_methods) { 2166 // if the next free entry ran off the block see if there's a free entry 2167 for (int i = 0; i < b->_number_of_methods; i++) { 2168 if (b->_methods[i] == _free_method) { 2169 b->_methods[i] = m; 2170 _last_free = b; 2171 return &(b->_methods[i]); 2172 } 2173 } 2174 // Only check each block once for frees. They're very unlikely. 2175 // Increment top past the end of the block. 2176 b->_top++; 2177 } 2178 // need to allocate a next block. 2179 if (b->_next == nullptr) { 2180 b->_next = _last_free = new JNIMethodBlockNode(); 2181 } 2182 } 2183 guarantee(false, "Should always allocate a free block"); 2184 return nullptr; 2185 } 2186 2187 bool contains(Method** m) { 2188 if (m == nullptr) return false; 2189 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2190 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2191 // This is a bit of extra checking, for two reasons. One is 2192 // that contains() deals with pointers that are passed in by 2193 // JNI code, so making sure that the pointer is aligned 2194 // correctly is valuable. The other is that <= and > are 2195 // technically not defined on pointers, so the if guard can 2196 // pass spuriously; no modern compiler is likely to make that 2197 // a problem, though (and if one did, the guard could also 2198 // fail spuriously, which would be bad). 2199 ptrdiff_t idx = m - b->_methods; 2200 if (b->_methods + idx == m) { 2201 return true; 2202 } 2203 } 2204 } 2205 return false; // not found 2206 } 2207 2208 // During class unloading the methods are cleared, which is different 2209 // than freed. 2210 void clear_all_methods() { 2211 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2212 for (int i = 0; i< b->_number_of_methods; i++) { 2213 b->_methods[i] = nullptr; 2214 } 2215 } 2216 } 2217 #ifndef PRODUCT 2218 int count_methods() { 2219 // count all allocated methods 2220 int count = 0; 2221 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2222 for (int i = 0; i< b->_number_of_methods; i++) { 2223 if (b->_methods[i] != _free_method) count++; 2224 } 2225 } 2226 return count; 2227 } 2228 #endif // PRODUCT 2229 }; 2230 2231 // Something that can't be mistaken for an address or a markWord 2232 Method* const JNIMethodBlock::_free_method = (Method*)55; 2233 2234 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) { 2235 _number_of_methods = MAX2(num_methods, min_block_size); 2236 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2237 for (int i = 0; i < _number_of_methods; i++) { 2238 _methods[i] = JNIMethodBlock::_free_method; 2239 } 2240 } 2241 2242 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) { 2243 // Have to add jmethod_ids() to class loader data thread-safely. 2244 // Also have to add the method to the list safely, which the lock 2245 // protects as well. 2246 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag); 2247 if (cld->jmethod_ids() == nullptr) { 2248 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2249 } else { 2250 cld->jmethod_ids()->ensure_methods(capacity); 2251 } 2252 } 2253 2254 // Add a method id to the jmethod_ids 2255 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) { 2256 // Have to add jmethod_ids() to class loader data thread-safely. 2257 // Also have to add the method to the list safely, which the lock 2258 // protects as well. 2259 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check"); 2260 2261 ResourceMark rm; 2262 log_debug(jmethod)("Creating jmethodID for Method %s", m->external_name()); 2263 if (cld->jmethod_ids() == nullptr) { 2264 cld->set_jmethod_ids(new JNIMethodBlock()); 2265 } 2266 // jmethodID is a pointer to Method* 2267 return (jmethodID)cld->jmethod_ids()->add_method(m); 2268 } 2269 2270 jmethodID Method::jmethod_id() { 2271 methodHandle mh(Thread::current(), this); 2272 return method_holder()->get_jmethod_id(mh); 2273 } 2274 2275 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2276 // Can't assert the method_holder is the same because the new method has the 2277 // scratch method holder. 2278 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2279 == new_method->method_holder()->class_loader() || 2280 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution 2281 "changing to a different class loader"); 2282 // Just change the method in place, jmethodID pointer doesn't change. 2283 *((Method**)jmid) = new_method; 2284 } 2285 2286 bool Method::is_method_id(jmethodID mid) { 2287 Method* m = resolve_jmethod_id(mid); 2288 assert(m != nullptr, "should be called with non-null method"); 2289 InstanceKlass* ik = m->method_holder(); 2290 ClassLoaderData* cld = ik->class_loader_data(); 2291 if (cld->jmethod_ids() == nullptr) return false; 2292 return (cld->jmethod_ids()->contains((Method**)mid)); 2293 } 2294 2295 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2296 if (mid == nullptr) return nullptr; 2297 Method* o = resolve_jmethod_id(mid); 2298 if (o == nullptr || o == JNIMethodBlock::_free_method) { 2299 return nullptr; 2300 } 2301 // Method should otherwise be valid. Assert for testing. 2302 assert(is_valid_method(o), "should be valid jmethodid"); 2303 // If the method's class holder object is unreferenced, but not yet marked as 2304 // unloaded, we need to return null here too because after a safepoint, its memory 2305 // will be reclaimed. 2306 return o->method_holder()->is_loader_alive() ? o : nullptr; 2307 }; 2308 2309 void Method::set_on_stack(const bool value) { 2310 // Set both the method itself and its constant pool. The constant pool 2311 // on stack means some method referring to it is also on the stack. 2312 constants()->set_on_stack(value); 2313 2314 bool already_set = on_stack_flag(); 2315 set_on_stack_flag(value); 2316 if (value && !already_set) { 2317 MetadataOnStackMark::record(this); 2318 } 2319 } 2320 2321 void Method::record_gc_epoch() { 2322 // If any method is on the stack in continuations, none of them can be reclaimed, 2323 // so save the marking cycle to check for the whole class in the cpCache. 2324 // The cpCache is writeable. 2325 constants()->cache()->record_gc_epoch(); 2326 } 2327 2328 // Called when the class loader is unloaded to make all methods weak. 2329 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2330 loader_data->jmethod_ids()->clear_all_methods(); 2331 } 2332 2333 void Method::clear_jmethod_id() { 2334 // Being at a safepoint prevents racing against other class redefinitions 2335 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); 2336 // The jmethodID is not stored in the Method instance, we need to look it up first 2337 jmethodID methodid = find_jmethod_id_or_null(); 2338 // We need to make sure that jmethodID actually resolves to this method 2339 // - multiple redefined versions may share jmethodID slots and if a method 2340 // has already been rewired to a newer version we could be removing reference 2341 // to a still existing method instance 2342 if (methodid != nullptr && *((Method**)methodid) == this) { 2343 *((Method**)methodid) = nullptr; 2344 } 2345 } 2346 2347 bool Method::has_method_vptr(const void* ptr) { 2348 Method m; 2349 // This assumes that the vtbl pointer is the first word of a C++ object. 2350 return dereference_vptr(&m) == dereference_vptr(ptr); 2351 } 2352 2353 // Check that this pointer is valid by checking that the vtbl pointer matches 2354 bool Method::is_valid_method(const Method* m) { 2355 if (m == nullptr) { 2356 return false; 2357 } else if ((intptr_t(m) & (wordSize-1)) != 0) { 2358 // Quick sanity check on pointer. 2359 return false; 2360 } else if (!os::is_readable_range(m, m + 1)) { 2361 return false; 2362 } else if (m->is_shared()) { 2363 return CppVtables::is_valid_shared_method(m); 2364 } else if (Metaspace::contains_non_shared(m)) { 2365 return has_method_vptr((const void*)m); 2366 } else { 2367 return false; 2368 } 2369 } 2370 2371 #ifndef PRODUCT 2372 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) { 2373 out->print("%d", loader_data->jmethod_ids()->count_methods()); 2374 } 2375 #endif // PRODUCT 2376 2377 2378 // Printing 2379 2380 #ifndef PRODUCT 2381 2382 void Method::print_on(outputStream* st) const { 2383 ResourceMark rm; 2384 assert(is_method(), "must be method"); 2385 st->print_cr("%s", internal_name()); 2386 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this)); 2387 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2388 st->print (" - constants: " PTR_FORMAT " ", p2i(constants())); 2389 constants()->print_value_on(st); st->cr(); 2390 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2391 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr(); 2392 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2393 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2394 st->print_cr(" - max stack: %d", max_stack()); 2395 st->print_cr(" - max locals: %d", max_locals()); 2396 st->print_cr(" - size of params: %d", size_of_parameters()); 2397 st->print_cr(" - method size: %d", method_size()); 2398 if (intrinsic_id() != vmIntrinsics::_none) 2399 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id())); 2400 if (highest_comp_level() != CompLevel_none) 2401 st->print_cr(" - highest level: %d", highest_comp_level()); 2402 st->print_cr(" - vtable index: %d", _vtable_index); 2403 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry())); 2404 st->print( " - adapters: "); 2405 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2406 if (a == nullptr) 2407 st->print_cr(PTR_FORMAT, p2i(a)); 2408 else 2409 a->print_adapter_on(st); 2410 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry())); 2411 st->print_cr(" - code size: %d", code_size()); 2412 if (code_size() != 0) { 2413 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base())); 2414 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size())); 2415 } 2416 if (method_data() != nullptr) { 2417 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data())); 2418 } 2419 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2420 if (checked_exceptions_length() > 0) { 2421 CheckedExceptionElement* table = checked_exceptions_start(); 2422 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table)); 2423 if (Verbose) { 2424 for (int i = 0; i < checked_exceptions_length(); i++) { 2425 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2426 } 2427 } 2428 } 2429 if (has_linenumber_table()) { 2430 u_char* table = compressed_linenumber_table(); 2431 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table)); 2432 if (Verbose) { 2433 CompressedLineNumberReadStream stream(table); 2434 while (stream.read_pair()) { 2435 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2436 } 2437 } 2438 } 2439 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2440 if (localvariable_table_length() > 0) { 2441 LocalVariableTableElement* table = localvariable_table_start(); 2442 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table)); 2443 if (Verbose) { 2444 for (int i = 0; i < localvariable_table_length(); i++) { 2445 int bci = table[i].start_bci; 2446 int len = table[i].length; 2447 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2448 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2449 int slot = table[i].slot; 2450 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2451 } 2452 } 2453 } 2454 if (code() != nullptr) { 2455 st->print (" - compiled code: "); 2456 code()->print_value_on(st); 2457 } 2458 if (is_native()) { 2459 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function())); 2460 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler())); 2461 } 2462 } 2463 2464 void Method::print_linkage_flags(outputStream* st) { 2465 access_flags().print_on(st); 2466 if (is_default_method()) { 2467 st->print("default "); 2468 } 2469 if (is_overpass()) { 2470 st->print("overpass "); 2471 } 2472 } 2473 #endif //PRODUCT 2474 2475 void Method::print_value_on(outputStream* st) const { 2476 assert(is_method(), "must be method"); 2477 st->print("%s", internal_name()); 2478 print_address_on(st); 2479 st->print(" "); 2480 name()->print_value_on(st); 2481 st->print(" "); 2482 signature()->print_value_on(st); 2483 st->print(" in "); 2484 method_holder()->print_value_on(st); 2485 if (WizardMode) st->print("#%d", _vtable_index); 2486 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2487 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code()); 2488 } 2489 2490 // Verification 2491 2492 void Method::verify_on(outputStream* st) { 2493 guarantee(is_method(), "object must be method"); 2494 guarantee(constants()->is_constantPool(), "should be constant pool"); 2495 MethodData* md = method_data(); 2496 guarantee(md == nullptr || 2497 md->is_methodData(), "should be method data"); 2498 } --- EOF ---