1 /* 2 * Copyright (c) 1997, 2023, 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/cppVtables.hpp" 27 #include "cds/metaspaceShared.hpp" 28 #include "classfile/classLoaderDataGraph.hpp" 29 #include "classfile/metadataOnStackMark.hpp" 30 #include "classfile/symbolTable.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "classfile/vmClasses.hpp" 33 #include "code/codeCache.hpp" 34 #include "code/debugInfoRec.hpp" 35 #include "compiler/compilationPolicy.hpp" 36 #include "gc/shared/collectedHeap.inline.hpp" 37 #include "interpreter/bytecodeStream.hpp" 38 #include "interpreter/bytecodeTracer.hpp" 39 #include "interpreter/bytecodes.hpp" 40 #include "interpreter/interpreter.hpp" 41 #include "interpreter/oopMapCache.hpp" 42 #include "logging/log.hpp" 43 #include "logging/logTag.hpp" 44 #include "logging/logStream.hpp" 45 #include "memory/allocation.inline.hpp" 46 #include "memory/metadataFactory.hpp" 47 #include "memory/metaspaceClosure.hpp" 48 #include "memory/oopFactory.hpp" 49 #include "memory/resourceArea.hpp" 50 #include "memory/universe.hpp" 51 #include "oops/constMethod.hpp" 52 #include "oops/constantPool.hpp" 53 #include "oops/klass.inline.hpp" 54 #include "oops/method.inline.hpp" 55 #include "oops/methodData.hpp" 56 #include "oops/objArrayKlass.hpp" 57 #include "oops/objArrayOop.inline.hpp" 58 #include "oops/oop.inline.hpp" 59 #include "oops/symbol.hpp" 60 #include "oops/inlineKlass.inline.hpp" 61 #include "prims/jvmtiExport.hpp" 62 #include "prims/methodHandles.hpp" 63 #include "runtime/arguments.hpp" 64 #include "runtime/atomic.hpp" 65 #include "runtime/continuationEntry.hpp" 66 #include "runtime/frame.inline.hpp" 67 #include "runtime/handles.inline.hpp" 68 #include "runtime/init.hpp" 69 #include "runtime/orderAccess.hpp" 70 #include "runtime/relocator.hpp" 71 #include "runtime/safepointVerifiers.hpp" 72 #include "runtime/sharedRuntime.hpp" 73 #include "runtime/signature.hpp" 74 #include "runtime/vm_version.hpp" 75 #include "services/memTracker.hpp" 76 #include "utilities/align.hpp" 77 #include "utilities/quickSort.hpp" 78 #include "utilities/vmError.hpp" 79 #include "utilities/xmlstream.hpp" 80 81 // Implementation of Method 82 83 Method* Method::allocate(ClassLoaderData* loader_data, 84 int byte_code_size, 85 AccessFlags access_flags, 86 InlineTableSizes* sizes, 87 ConstMethod::MethodType method_type, 88 Symbol* name, 89 TRAPS) { 90 assert(!access_flags.is_native() || byte_code_size == 0, 91 "native methods should not contain byte codes"); 92 ConstMethod* cm = ConstMethod::allocate(loader_data, 93 byte_code_size, 94 sizes, 95 method_type, 96 CHECK_NULL); 97 int size = Method::size(access_flags.is_native()); 98 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name); 99 } 100 101 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) { 102 NoSafepointVerifier no_safepoint; 103 set_constMethod(xconst); 104 set_access_flags(access_flags); 105 set_intrinsic_id(vmIntrinsics::_none); 106 set_method_data(nullptr); 107 clear_method_counters(); 108 set_vtable_index(Method::garbage_vtable_index); 109 110 // Fix and bury in Method* 111 set_interpreter_entry(nullptr); // sets i2i entry and from_int 112 set_adapter_entry(nullptr); 113 Method::clear_code(); // from_c/from_i get set to c2i/i2i 114 115 if (access_flags.is_native()) { 116 clear_native_function(); 117 set_signature_handler(nullptr); 118 } 119 NOT_PRODUCT(set_compiled_invocation_count(0);) 120 // Name is very useful for debugging. 121 NOT_PRODUCT(_name = name;) 122 } 123 124 // Release Method*. The nmethod will be gone when we get here because 125 // we've walked the code cache. 126 void Method::deallocate_contents(ClassLoaderData* loader_data) { 127 MetadataFactory::free_metadata(loader_data, constMethod()); 128 set_constMethod(nullptr); 129 MetadataFactory::free_metadata(loader_data, method_data()); 130 set_method_data(nullptr); 131 MetadataFactory::free_metadata(loader_data, method_counters()); 132 clear_method_counters(); 133 // The nmethod will be gone when we get here. 134 if (code() != nullptr) _code = nullptr; 135 } 136 137 void Method::release_C_heap_structures() { 138 if (method_data()) { 139 method_data()->release_C_heap_structures(); 140 141 // Destroy MethodData embedded lock 142 method_data()->~MethodData(); 143 } 144 } 145 146 address Method::get_i2c_entry() { 147 assert(adapter() != nullptr, "must have"); 148 return adapter()->get_i2c_entry(); 149 } 150 151 address Method::get_c2i_entry() { 152 assert(adapter() != nullptr, "must have"); 153 return adapter()->get_c2i_entry(); 154 } 155 156 address Method::get_c2i_inline_entry() { 157 assert(adapter() != nullptr, "must have"); 158 return adapter()->get_c2i_inline_entry(); 159 } 160 161 address Method::get_c2i_unverified_entry() { 162 assert(adapter() != nullptr, "must have"); 163 return adapter()->get_c2i_unverified_entry(); 164 } 165 166 address Method::get_c2i_unverified_inline_entry() { 167 assert(adapter() != nullptr, "must have"); 168 return adapter()->get_c2i_unverified_inline_entry(); 169 } 170 171 address Method::get_c2i_no_clinit_check_entry() { 172 assert(VM_Version::supports_fast_class_init_checks(), ""); 173 assert(adapter() != nullptr, "must have"); 174 return adapter()->get_c2i_no_clinit_check_entry(); 175 } 176 177 char* Method::name_and_sig_as_C_string() const { 178 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 179 } 180 181 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 182 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 183 } 184 185 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 186 const char* klass_name = klass->external_name(); 187 int klass_name_len = (int)strlen(klass_name); 188 int method_name_len = method_name->utf8_length(); 189 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 190 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 191 strcpy(dest, klass_name); 192 dest[klass_name_len] = '.'; 193 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 194 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 195 dest[len] = 0; 196 return dest; 197 } 198 199 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 200 Symbol* klass_name = klass->name(); 201 klass_name->as_klass_external_name(buf, size); 202 int len = (int)strlen(buf); 203 204 if (len < size - 1) { 205 buf[len++] = '.'; 206 207 method_name->as_C_string(&(buf[len]), size - len); 208 len = (int)strlen(buf); 209 210 signature->as_C_string(&(buf[len]), size - len); 211 } 212 213 return buf; 214 } 215 216 const char* Method::external_name() const { 217 return external_name(constants()->pool_holder(), name(), signature()); 218 } 219 220 void Method::print_external_name(outputStream *os) const { 221 print_external_name(os, constants()->pool_holder(), name(), signature()); 222 } 223 224 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) { 225 stringStream ss; 226 print_external_name(&ss, klass, method_name, signature); 227 return ss.as_string(); 228 } 229 230 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) { 231 signature->print_as_signature_external_return_type(os); 232 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string()); 233 signature->print_as_signature_external_parameters(os); 234 os->print(")"); 235 } 236 237 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) { 238 if (log_is_enabled(Debug, exceptions)) { 239 ResourceMark rm(THREAD); 240 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"", 241 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string()); 242 } 243 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 244 // access exception table 245 ExceptionTable table(mh()); 246 int length = table.length(); 247 // iterate through all entries sequentially 248 constantPoolHandle pool(THREAD, mh->constants()); 249 for (int i = 0; i < length; i ++) { 250 //reacquire the table in case a GC happened 251 ExceptionTable table(mh()); 252 int beg_bci = table.start_pc(i); 253 int end_bci = table.end_pc(i); 254 assert(beg_bci <= end_bci, "inconsistent exception table"); 255 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d", 256 beg_bci, end_bci); 257 258 if (beg_bci <= throw_bci && throw_bci < end_bci) { 259 // exception handler bci range covers throw_bci => investigate further 260 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci); 261 262 int handler_bci = table.handler_pc(i); 263 int klass_index = table.catch_type_index(i); 264 if (klass_index == 0) { 265 if (log_is_enabled(Info, exceptions)) { 266 ResourceMark rm(THREAD); 267 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d", 268 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci); 269 } 270 return handler_bci; 271 } else if (ex_klass == nullptr) { 272 // Is this even possible? 273 if (log_is_enabled(Info, exceptions)) { 274 ResourceMark rm(THREAD); 275 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d", 276 mh()->name()->as_C_string(), handler_bci); 277 } 278 return handler_bci; 279 } else { 280 if (log_is_enabled(Debug, exceptions)) { 281 ResourceMark rm(THREAD); 282 log_debug(exceptions)(" - resolving catch type \"%s\"", 283 pool->klass_name_at(klass_index)->as_C_string()); 284 } 285 // we know the exception class => get the constraint class 286 // this may require loading of the constraint class; if verification 287 // fails or some other exception occurs, return handler_bci 288 Klass* k = pool->klass_at(klass_index, THREAD); 289 if (HAS_PENDING_EXCEPTION) { 290 if (log_is_enabled(Debug, exceptions)) { 291 ResourceMark rm(THREAD); 292 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type", 293 PENDING_EXCEPTION->klass()->external_name()); 294 } 295 return handler_bci; 296 } 297 assert(k != nullptr, "klass not loaded"); 298 if (ex_klass->is_subtype_of(k)) { 299 if (log_is_enabled(Info, exceptions)) { 300 ResourceMark rm(THREAD); 301 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d", 302 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci); 303 } 304 return handler_bci; 305 } 306 } 307 } 308 } 309 310 if (log_is_enabled(Debug, exceptions)) { 311 ResourceMark rm(THREAD); 312 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"", 313 ex_klass->external_name(), mh->name()->as_C_string()); 314 } 315 316 return -1; 317 } 318 319 void Method::mask_for(int bci, InterpreterOopMap* mask) { 320 methodHandle h_this(Thread::current(), this); 321 // Only GC uses the OopMapCache during thread stack root scanning 322 // any other uses generate an oopmap but do not save it in the cache. 323 if (Universe::heap()->is_gc_active()) { 324 method_holder()->mask_for(h_this, bci, mask); 325 } else { 326 OopMapCache::compute_one_oop_map(h_this, bci, mask); 327 } 328 return; 329 } 330 331 332 int Method::bci_from(address bcp) const { 333 if (is_native() && bcp == 0) { 334 return 0; 335 } 336 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code 337 // may call this after interrupting a nested ResourceMark. 338 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(), 339 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp)); 340 341 return int(bcp - code_base()); 342 } 343 344 345 int Method::validate_bci(int bci) const { 346 return (bci == 0 || bci < code_size()) ? bci : -1; 347 } 348 349 // Return bci if it appears to be a valid bcp 350 // Return -1 otherwise. 351 // Used by profiling code, when invalid data is a possibility. 352 // The caller is responsible for validating the Method* itself. 353 int Method::validate_bci_from_bcp(address bcp) const { 354 // keep bci as -1 if not a valid bci 355 int bci = -1; 356 if (bcp == 0 || bcp == code_base()) { 357 // code_size() may return 0 and we allow 0 here 358 // the method may be native 359 bci = 0; 360 } else if (contains(bcp)) { 361 bci = int(bcp - code_base()); 362 } 363 // Assert that if we have dodged any asserts, bci is negative. 364 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 365 return bci; 366 } 367 368 address Method::bcp_from(int bci) const { 369 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), 370 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native"); 371 address bcp = code_base() + bci; 372 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 373 return bcp; 374 } 375 376 address Method::bcp_from(address bcp) const { 377 if (is_native() && bcp == nullptr) { 378 return code_base(); 379 } else { 380 return bcp; 381 } 382 } 383 384 int Method::size(bool is_native) { 385 // If native, then include pointers for native_function and signature_handler 386 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 387 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord; 388 return align_metadata_size(header_size() + extra_words); 389 } 390 391 Symbol* Method::klass_name() const { 392 return method_holder()->name(); 393 } 394 395 void Method::metaspace_pointers_do(MetaspaceClosure* it) { 396 log_trace(cds)("Iter(Method): %p", this); 397 398 if (!method_holder()->is_rewritten()) { 399 it->push(&_constMethod, MetaspaceClosure::_writable); 400 } else { 401 it->push(&_constMethod); 402 } 403 it->push(&_method_data); 404 it->push(&_method_counters); 405 NOT_PRODUCT(it->push(&_name);) 406 } 407 408 #if INCLUDE_CDS 409 // Attempt to return method to original state. Clear any pointers 410 // (to objects outside the shared spaces). We won't be able to predict 411 // where they should point in a new JVM. Further initialize some 412 // entries now in order allow them to be write protected later. 413 414 void Method::remove_unshareable_info() { 415 unlink_method(); 416 JFR_ONLY(REMOVE_METHOD_ID(this);) 417 } 418 419 void Method::restore_unshareable_info(TRAPS) { 420 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored"); 421 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set"); 422 } 423 #endif 424 425 void Method::set_vtable_index(int index) { 426 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) { 427 // At runtime initialize_vtable is rerun as part of link_class_impl() 428 // for a shared class loaded by the non-boot loader to obtain the loader 429 // constraints based on the runtime classloaders' context. 430 return; // don't write into the shared class 431 } else { 432 _vtable_index = index; 433 } 434 } 435 436 void Method::set_itable_index(int index) { 437 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) { 438 // At runtime initialize_itable is rerun as part of link_class_impl() 439 // for a shared class loaded by the non-boot loader to obtain the loader 440 // constraints based on the runtime classloaders' context. The dumptime 441 // itable index should be the same as the runtime index. 442 assert(_vtable_index == itable_index_max - index, 443 "archived itable index is different from runtime index"); 444 return; // don’t write into the shared class 445 } else { 446 _vtable_index = itable_index_max - index; 447 } 448 assert(valid_itable_index(), ""); 449 } 450 451 // The RegisterNatives call being attempted tried to register with a method that 452 // is not native. Ask JVM TI what prefixes have been specified. Then check 453 // to see if the native method is now wrapped with the prefixes. See the 454 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details. 455 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) { 456 #if INCLUDE_JVMTI 457 ResourceMark rm(THREAD); 458 Method* method; 459 int name_len = name->utf8_length(); 460 char* name_str = name->as_utf8(); 461 int prefix_count; 462 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count); 463 for (int i = 0; i < prefix_count; i++) { 464 char* prefix = prefixes[i]; 465 int prefix_len = (int)strlen(prefix); 466 467 // try adding this prefix to the method name and see if it matches another method name 468 int trial_len = name_len + prefix_len; 469 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1); 470 strcpy(trial_name_str, prefix); 471 strcat(trial_name_str, name_str); 472 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len); 473 if (trial_name == nullptr) { 474 continue; // no such symbol, so this prefix wasn't used, try the next prefix 475 } 476 method = k->lookup_method(trial_name, signature); 477 if (method == nullptr) { 478 continue; // signature doesn't match, try the next prefix 479 } 480 if (method->is_native()) { 481 method->set_is_prefixed_native(); 482 return method; // wahoo, we found a prefixed version of the method, return it 483 } 484 // found as non-native, so prefix is good, add it, probably just need more prefixes 485 name_len = trial_len; 486 name_str = trial_name_str; 487 } 488 #endif // INCLUDE_JVMTI 489 return nullptr; // not found 490 } 491 492 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) { 493 Method* method = k->lookup_method(name, signature); 494 if (method == nullptr) { 495 ResourceMark rm(THREAD); 496 stringStream st; 497 st.print("Method '"); 498 print_external_name(&st, k, name, signature); 499 st.print("' name or signature does not match"); 500 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false); 501 } 502 if (!method->is_native()) { 503 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es) 504 method = find_prefixed_native(k, name, signature, THREAD); 505 if (method == nullptr) { 506 ResourceMark rm(THREAD); 507 stringStream st; 508 st.print("Method '"); 509 print_external_name(&st, k, name, signature); 510 st.print("' is not declared as native"); 511 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false); 512 } 513 } 514 515 if (entry != nullptr) { 516 method->set_native_function(entry, native_bind_event_is_interesting); 517 } else { 518 method->clear_native_function(); 519 } 520 if (log_is_enabled(Debug, jni, resolve)) { 521 ResourceMark rm(THREAD); 522 log_debug(jni, resolve)("[Registering JNI native method %s.%s]", 523 method->method_holder()->external_name(), 524 method->name()->as_C_string()); 525 } 526 return true; 527 } 528 529 bool Method::was_executed_more_than(int n) { 530 // Invocation counter is reset when the Method* is compiled. 531 // If the method has compiled code we therefore assume it has 532 // be executed more than n times. 533 if (is_accessor() || is_empty_method() || (code() != nullptr)) { 534 // interpreter doesn't bump invocation counter of trivial methods 535 // compiler does not bump invocation counter of compiled methods 536 return true; 537 } 538 else if ((method_counters() != nullptr && 539 method_counters()->invocation_counter()->carry()) || 540 (method_data() != nullptr && 541 method_data()->invocation_counter()->carry())) { 542 // The carry bit is set when the counter overflows and causes 543 // a compilation to occur. We don't know how many times 544 // the counter has been reset, so we simply assume it has 545 // been executed more than n times. 546 return true; 547 } else { 548 return invocation_count() > n; 549 } 550 } 551 552 void Method::print_invocation_count() { 553 //---< compose+print method return type, klass, name, and signature >--- 554 if (is_static()) tty->print("static "); 555 if (is_final()) tty->print("final "); 556 if (is_synchronized()) tty->print("synchronized "); 557 if (is_native()) tty->print("native "); 558 tty->print("%s::", method_holder()->external_name()); 559 name()->print_symbol_on(tty); 560 signature()->print_symbol_on(tty); 561 562 if (WizardMode) { 563 // dump the size of the byte codes 564 tty->print(" {%d}", code_size()); 565 } 566 tty->cr(); 567 568 // Counting based on signed int counters tends to overflow with 569 // longer-running workloads on fast machines. The counters under 570 // consideration here, however, are limited in range by counting 571 // logic. See InvocationCounter:count_limit for example. 572 // No "overflow precautions" need to be implemented here. 573 tty->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count()); 574 tty->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count()); 575 tty->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count()); 576 577 if (method_data() != nullptr) { 578 tty->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count()); 579 } 580 581 #ifndef PRODUCT 582 if (CountCompiledCalls) { 583 tty->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count()); 584 } 585 #endif 586 } 587 588 // Build a MethodData* object to hold profiling information collected on this 589 // method when requested. 590 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) { 591 // Do not profile the method if metaspace has hit an OOM previously 592 // allocating profiling data. Callers clear pending exception so don't 593 // add one here. 594 if (ClassLoaderDataGraph::has_metaspace_oom()) { 595 return; 596 } 597 598 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 599 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 600 if (HAS_PENDING_EXCEPTION) { 601 CompileBroker::log_metaspace_failure(); 602 ClassLoaderDataGraph::set_metaspace_oom(true); 603 return; // return the exception (which is cleared) 604 } 605 606 if (!Atomic::replace_if_null(&method->_method_data, method_data)) { 607 MetadataFactory::free_metadata(loader_data, method_data); 608 return; 609 } 610 611 if (PrintMethodData && (Verbose || WizardMode)) { 612 ResourceMark rm(THREAD); 613 tty->print("build_profiling_method_data for "); 614 method->print_name(tty); 615 tty->cr(); 616 // At the end of the run, the MDO, full of data, will be dumped. 617 } 618 } 619 620 MethodCounters* Method::build_method_counters(Thread* current, Method* m) { 621 // Do not profile the method if metaspace has hit an OOM previously 622 if (ClassLoaderDataGraph::has_metaspace_oom()) { 623 return nullptr; 624 } 625 626 methodHandle mh(current, m); 627 MethodCounters* counters; 628 if (current->is_Java_thread()) { 629 JavaThread* THREAD = JavaThread::cast(current); // For exception macros. 630 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold 631 // if needed. 632 counters = MethodCounters::allocate_with_exception(mh, THREAD); 633 if (HAS_PENDING_EXCEPTION) { 634 CLEAR_PENDING_EXCEPTION; 635 } 636 } else { 637 // Call metaspace allocation that doesn't throw exception if the 638 // current thread isn't a JavaThread, ie. the VMThread. 639 counters = MethodCounters::allocate_no_exception(mh); 640 } 641 642 if (counters == nullptr) { 643 CompileBroker::log_metaspace_failure(); 644 ClassLoaderDataGraph::set_metaspace_oom(true); 645 return nullptr; 646 } 647 648 if (!mh->init_method_counters(counters)) { 649 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 650 } 651 652 return mh->method_counters(); 653 } 654 655 bool Method::init_method_counters(MethodCounters* counters) { 656 // Try to install a pointer to MethodCounters, return true on success. 657 return Atomic::replace_if_null(&_method_counters, counters); 658 } 659 660 int Method::extra_stack_words() { 661 // not an inline function, to avoid a header dependency on Interpreter 662 return extra_stack_entries() * Interpreter::stackElementSize; 663 } 664 665 // InlineKlass the method is declared to return. This must not 666 // safepoint as it is called with references live on the stack at 667 // locations the GC is unaware of. 668 InlineKlass* Method::returns_inline_type(Thread* thread) const { 669 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields"); 670 NoSafepointVerifier nsv; 671 SignatureStream ss(signature()); 672 while (!ss.at_return_type()) { 673 ss.next(); 674 } 675 return ss.as_inline_klass(method_holder()); 676 } 677 678 bool Method::is_vanilla_constructor() const { 679 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 680 // which only calls the superclass vanilla constructor and possibly does stores of 681 // zero constants to local fields: 682 // 683 // aload_0, _fast_aload_0, or _nofast_aload_0 684 // invokespecial 685 // indexbyte1 686 // indexbyte2 687 // 688 // followed by an (optional) sequence of: 689 // 690 // aload_0 691 // aconst_null / iconst_0 / fconst_0 / dconst_0 692 // putfield 693 // indexbyte1 694 // indexbyte2 695 // 696 // followed by: 697 // 698 // return 699 700 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 701 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 702 int size = code_size(); 703 // Check if size match 704 if (size == 0 || size % 5 != 0) return false; 705 address cb = code_base(); 706 int last = size - 1; 707 if ((cb[0] != Bytecodes::_aload_0 && cb[0] != Bytecodes::_fast_aload_0 && cb[0] != Bytecodes::_nofast_aload_0) || 708 cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 709 // Does not call superclass default constructor 710 return false; 711 } 712 // Check optional sequence 713 for (int i = 4; i < last; i += 5) { 714 if (cb[i] != Bytecodes::_aload_0) return false; 715 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 716 if (cb[i+2] != Bytecodes::_putfield) return false; 717 } 718 return true; 719 } 720 721 722 bool Method::compute_has_loops_flag() { 723 BytecodeStream bcs(methodHandle(Thread::current(), this)); 724 Bytecodes::Code bc; 725 726 while ((bc = bcs.next()) >= 0) { 727 switch (bc) { 728 case Bytecodes::_ifeq: 729 case Bytecodes::_ifnull: 730 case Bytecodes::_iflt: 731 case Bytecodes::_ifle: 732 case Bytecodes::_ifne: 733 case Bytecodes::_ifnonnull: 734 case Bytecodes::_ifgt: 735 case Bytecodes::_ifge: 736 case Bytecodes::_if_icmpeq: 737 case Bytecodes::_if_icmpne: 738 case Bytecodes::_if_icmplt: 739 case Bytecodes::_if_icmpgt: 740 case Bytecodes::_if_icmple: 741 case Bytecodes::_if_icmpge: 742 case Bytecodes::_if_acmpeq: 743 case Bytecodes::_if_acmpne: 744 case Bytecodes::_goto: 745 case Bytecodes::_jsr: 746 if (bcs.dest() < bcs.next_bci()) { 747 return set_has_loops(); 748 } 749 break; 750 751 case Bytecodes::_goto_w: 752 case Bytecodes::_jsr_w: 753 if (bcs.dest_w() < bcs.next_bci()) { 754 return set_has_loops(); 755 } 756 break; 757 758 case Bytecodes::_lookupswitch: { 759 Bytecode_lookupswitch lookupswitch(this, bcs.bcp()); 760 if (lookupswitch.default_offset() < 0) { 761 return set_has_loops(); 762 } else { 763 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) { 764 LookupswitchPair pair = lookupswitch.pair_at(i); 765 if (pair.offset() < 0) { 766 return set_has_loops(); 767 } 768 } 769 } 770 break; 771 } 772 case Bytecodes::_tableswitch: { 773 Bytecode_tableswitch tableswitch(this, bcs.bcp()); 774 if (tableswitch.default_offset() < 0) { 775 return set_has_loops(); 776 } else { 777 for (int i = 0; i < tableswitch.length(); ++i) { 778 if (tableswitch.dest_offset_at(i) < 0) { 779 return set_has_loops(); 780 } 781 } 782 } 783 break; 784 } 785 default: 786 break; 787 } 788 } 789 790 _flags.set_has_loops_flag_init(true); 791 return false; 792 } 793 794 bool Method::is_final_method(AccessFlags class_access_flags) const { 795 // or "does_not_require_vtable_entry" 796 // default method or overpass can occur, is not final (reuses vtable entry) 797 // private methods in classes get vtable entries for backward class compatibility. 798 if (is_overpass() || is_default_method()) return false; 799 return is_final() || class_access_flags.is_final(); 800 } 801 802 bool Method::is_final_method() const { 803 return is_final_method(method_holder()->access_flags()); 804 } 805 806 bool Method::is_default_method() const { 807 if (method_holder() != nullptr && 808 method_holder()->is_interface() && 809 !is_abstract() && !is_private()) { 810 return true; 811 } else { 812 return false; 813 } 814 } 815 816 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 817 if (is_final_method(class_access_flags)) return true; 818 #ifdef ASSERT 819 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 820 if (class_access_flags.is_interface()) { 821 ResourceMark rm; 822 assert(is_nonv == is_static() || is_nonv == is_private(), 823 "nonvirtual unexpected for non-static, non-private: %s", 824 name_and_sig_as_C_string()); 825 } 826 #endif 827 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 828 return vtable_index() == nonvirtual_vtable_index; 829 } 830 831 bool Method::can_be_statically_bound() const { 832 return can_be_statically_bound(method_holder()->access_flags()); 833 } 834 835 bool Method::can_be_statically_bound(InstanceKlass* context) const { 836 return (method_holder() == context) && can_be_statically_bound(); 837 } 838 839 /** 840 * Returns false if this is one of specially treated methods for 841 * which we have to provide stack trace in throw in compiled code. 842 * Returns true otherwise. 843 */ 844 bool Method::can_omit_stack_trace() { 845 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) { 846 return false; // All methods in sun.invoke.util.ValueConversions 847 } 848 return true; 849 } 850 851 bool Method::is_accessor() const { 852 return is_getter() || is_setter(); 853 } 854 855 bool Method::is_getter() const { 856 if (code_size() != 5) return false; 857 if (size_of_parameters() != 1) return false; 858 if (java_code_at(0) != Bytecodes::_aload_0) return false; 859 if (java_code_at(1) != Bytecodes::_getfield) return false; 860 switch (java_code_at(4)) { 861 case Bytecodes::_ireturn: 862 case Bytecodes::_lreturn: 863 case Bytecodes::_freturn: 864 case Bytecodes::_dreturn: 865 case Bytecodes::_areturn: 866 break; 867 default: 868 return false; 869 } 870 if (has_scalarized_return()) { 871 // Don't treat this as (trivial) getter method because the 872 // inline type should be returned in a scalarized form. 873 return false; 874 } 875 return true; 876 } 877 878 bool Method::is_setter() const { 879 if (code_size() != 6) return false; 880 if (java_code_at(0) != Bytecodes::_aload_0) return false; 881 switch (java_code_at(1)) { 882 case Bytecodes::_iload_1: 883 case Bytecodes::_aload_1: 884 case Bytecodes::_fload_1: 885 if (size_of_parameters() != 2) return false; 886 break; 887 case Bytecodes::_dload_1: 888 case Bytecodes::_lload_1: 889 if (size_of_parameters() != 3) return false; 890 break; 891 default: 892 return false; 893 } 894 if (java_code_at(2) != Bytecodes::_putfield) return false; 895 if (java_code_at(5) != Bytecodes::_return) return false; 896 if (has_scalarized_args()) { 897 // Don't treat this as (trivial) setter method because the 898 // inline type argument should be passed in a scalarized form. 899 return false; 900 } 901 return true; 902 } 903 904 bool Method::is_constant_getter() const { 905 int last_index = code_size() - 1; 906 // Check if the first 1-3 bytecodes are a constant push 907 // and the last bytecode is a return. 908 return (2 <= code_size() && code_size() <= 4 && 909 Bytecodes::is_const(java_code_at(0)) && 910 Bytecodes::length_for(java_code_at(0)) == last_index && 911 Bytecodes::is_return(java_code_at(last_index)) && 912 !has_scalarized_args()); 913 } 914 915 bool Method::is_object_constructor_or_class_initializer() const { 916 return (is_object_constructor() || is_class_initializer()); 917 } 918 919 bool Method::is_class_initializer() const { 920 // For classfiles version 51 or greater, ensure that the clinit method is 921 // static. Non-static methods with the name "<clinit>" are not static 922 // initializers. (older classfiles exempted for backward compatibility) 923 return (name() == vmSymbols::class_initializer_name() && 924 (is_static() || 925 method_holder()->major_version() < 51)); 926 } 927 928 // A method named <init>, is a classic object constructor. 929 bool Method::is_object_constructor() const { 930 return name() == vmSymbols::object_initializer_name(); 931 } 932 933 // A method named <vnew> is a factory for an inline class. 934 bool Method::is_static_vnew_factory() const { 935 return name() == vmSymbols::inline_factory_name(); 936 } 937 938 bool Method::needs_clinit_barrier() const { 939 return is_static() && !method_holder()->is_initialized(); 940 } 941 942 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 943 int length = method->checked_exceptions_length(); 944 if (length == 0) { // common case 945 return objArrayHandle(THREAD, Universe::the_empty_class_array()); 946 } else { 947 methodHandle h_this(THREAD, method); 948 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle())); 949 objArrayHandle mirrors (THREAD, m_oop); 950 for (int i = 0; i < length; i++) { 951 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 952 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 953 if (log_is_enabled(Warning, exceptions) && 954 !k->is_subclass_of(vmClasses::Throwable_klass())) { 955 ResourceMark rm(THREAD); 956 log_warning(exceptions)( 957 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable", 958 k->external_name(), method->external_name()); 959 } 960 mirrors->obj_at_put(i, k->java_mirror()); 961 } 962 return mirrors; 963 } 964 }; 965 966 967 int Method::line_number_from_bci(int bci) const { 968 int best_bci = 0; 969 int best_line = -1; 970 if (bci == SynchronizationEntryBCI) bci = 0; 971 if (0 <= bci && bci < code_size() && has_linenumber_table()) { 972 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 973 // Not necessarily sorted and not necessarily one-to-one. 974 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 975 while (stream.read_pair()) { 976 if (stream.bci() == bci) { 977 // perfect match 978 return stream.line(); 979 } else { 980 // update best_bci/line 981 if (stream.bci() < bci && stream.bci() >= best_bci) { 982 best_bci = stream.bci(); 983 best_line = stream.line(); 984 } 985 } 986 } 987 } 988 return best_line; 989 } 990 991 992 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 993 if( constants()->tag_at(klass_index).is_unresolved_klass()) { 994 Thread *thread = Thread::current(); 995 Symbol* klass_name = constants()->klass_name_at(klass_index); 996 Handle loader(thread, method_holder()->class_loader()); 997 Handle prot (thread, method_holder()->protection_domain()); 998 return SystemDictionary::find_instance_klass(thread, klass_name, loader, prot) != nullptr; 999 } else { 1000 return true; 1001 } 1002 } 1003 1004 1005 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const { 1006 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc); 1007 if (must_be_resolved) { 1008 // Make sure klass is resolved in constantpool. 1009 if (constants()->tag_at(klass_index).is_unresolved_klass()) { 1010 return false; 1011 } 1012 } 1013 return is_klass_loaded_by_klass_index(klass_index); 1014 } 1015 1016 1017 void Method::set_native_function(address function, bool post_event_flag) { 1018 assert(function != nullptr, "use clear_native_function to unregister natives"); 1019 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 1020 address* native_function = native_function_addr(); 1021 1022 // We can see racers trying to place the same native function into place. Once 1023 // is plenty. 1024 address current = *native_function; 1025 if (current == function) return; 1026 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 1027 function != nullptr) { 1028 // native_method_throw_unsatisfied_link_error_entry() should only 1029 // be passed when post_event_flag is false. 1030 assert(function != 1031 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1032 "post_event_flag mismatch"); 1033 1034 // post the bind event, and possible change the bind function 1035 JvmtiExport::post_native_method_bind(this, &function); 1036 } 1037 *native_function = function; 1038 // This function can be called more than once. We must make sure that we always 1039 // use the latest registered method -> check if a stub already has been generated. 1040 // If so, we have to make it not_entrant. 1041 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates 1042 if (nm != nullptr) { 1043 nm->make_not_entrant(); 1044 } 1045 } 1046 1047 1048 bool Method::has_native_function() const { 1049 if (is_special_native_intrinsic()) 1050 return false; // special-cased in SharedRuntime::generate_native_wrapper 1051 address func = native_function(); 1052 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 1053 } 1054 1055 1056 void Method::clear_native_function() { 1057 // Note: is_method_handle_intrinsic() is allowed here. 1058 set_native_function( 1059 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1060 !native_bind_event_is_interesting); 1061 this->unlink_code(); 1062 } 1063 1064 1065 void Method::set_signature_handler(address handler) { 1066 address* signature_handler = signature_handler_addr(); 1067 *signature_handler = handler; 1068 } 1069 1070 1071 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 1072 assert(reason != nullptr, "must provide a reason"); 1073 if (PrintCompilation && report) { 1074 ttyLocker ttyl; 1075 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 1076 if (comp_level == CompLevel_all) { 1077 tty->print("all levels "); 1078 } else { 1079 tty->print("level %d ", comp_level); 1080 } 1081 this->print_short_name(tty); 1082 int size = this->code_size(); 1083 if (size > 0) { 1084 tty->print(" (%d bytes)", size); 1085 } 1086 if (reason != nullptr) { 1087 tty->print(" %s", reason); 1088 } 1089 tty->cr(); 1090 } 1091 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) { 1092 ttyLocker ttyl; 1093 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 1094 os::current_thread_id(), is_osr, comp_level); 1095 if (reason != nullptr) { 1096 xtty->print(" reason=\'%s\'", reason); 1097 } 1098 xtty->method(this); 1099 xtty->stamp(); 1100 xtty->end_elem(); 1101 } 1102 } 1103 1104 bool Method::is_always_compilable() const { 1105 // Generated adapters must be compiled 1106 if (is_special_native_intrinsic() && is_synthetic()) { 1107 assert(!is_not_c1_compilable(), "sanity check"); 1108 assert(!is_not_c2_compilable(), "sanity check"); 1109 return true; 1110 } 1111 1112 return false; 1113 } 1114 1115 bool Method::is_not_compilable(int comp_level) const { 1116 if (number_of_breakpoints() > 0) 1117 return true; 1118 if (is_always_compilable()) 1119 return false; 1120 if (comp_level == CompLevel_any) 1121 return is_not_c1_compilable() && is_not_c2_compilable(); 1122 if (is_c1_compile(comp_level)) 1123 return is_not_c1_compilable(); 1124 if (is_c2_compile(comp_level)) 1125 return is_not_c2_compilable(); 1126 return false; 1127 } 1128 1129 // call this when compiler finds that this method is not compilable 1130 void Method::set_not_compilable(const char* reason, int comp_level, bool report) { 1131 if (is_always_compilable()) { 1132 // Don't mark a method which should be always compilable 1133 return; 1134 } 1135 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 1136 if (comp_level == CompLevel_all) { 1137 set_is_not_c1_compilable(); 1138 set_is_not_c2_compilable(); 1139 } else { 1140 if (is_c1_compile(comp_level)) 1141 set_is_not_c1_compilable(); 1142 if (is_c2_compile(comp_level)) 1143 set_is_not_c2_compilable(); 1144 } 1145 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check"); 1146 } 1147 1148 bool Method::is_not_osr_compilable(int comp_level) const { 1149 if (is_not_compilable(comp_level)) 1150 return true; 1151 if (comp_level == CompLevel_any) 1152 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable(); 1153 if (is_c1_compile(comp_level)) 1154 return is_not_c1_osr_compilable(); 1155 if (is_c2_compile(comp_level)) 1156 return is_not_c2_osr_compilable(); 1157 return false; 1158 } 1159 1160 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) { 1161 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 1162 if (comp_level == CompLevel_all) { 1163 set_is_not_c1_osr_compilable(); 1164 set_is_not_c2_osr_compilable(); 1165 } else { 1166 if (is_c1_compile(comp_level)) 1167 set_is_not_c1_osr_compilable(); 1168 if (is_c2_compile(comp_level)) 1169 set_is_not_c2_osr_compilable(); 1170 } 1171 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check"); 1172 } 1173 1174 // Revert to using the interpreter and clear out the nmethod 1175 void Method::clear_code() { 1176 // this may be null if c2i adapters have not been made yet 1177 // Only should happen at allocate time. 1178 if (adapter() == nullptr) { 1179 _from_compiled_entry = nullptr; 1180 _from_compiled_inline_entry = nullptr; 1181 _from_compiled_inline_ro_entry = nullptr; 1182 } else { 1183 _from_compiled_entry = adapter()->get_c2i_entry(); 1184 _from_compiled_inline_entry = adapter()->get_c2i_inline_entry(); 1185 _from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry(); 1186 } 1187 OrderAccess::storestore(); 1188 _from_interpreted_entry = _i2i_entry; 1189 OrderAccess::storestore(); 1190 _code = nullptr; 1191 } 1192 1193 void Method::unlink_code(CompiledMethod *compare) { 1194 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? nullptr : CompiledMethod_lock, 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 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? nullptr : CompiledMethod_lock, 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 Arguments::assert_is_dumping_archive(); 1213 _code = nullptr; 1214 _adapter = nullptr; 1215 _i2i_entry = nullptr; 1216 _from_compiled_entry = nullptr; 1217 _from_compiled_inline_entry = nullptr; 1218 _from_compiled_inline_ro_entry = nullptr; 1219 _from_interpreted_entry = nullptr; 1220 1221 if (is_native()) { 1222 *native_function_addr() = nullptr; 1223 set_signature_handler(nullptr); 1224 } 1225 NOT_PRODUCT(set_compiled_invocation_count(0);) 1226 1227 set_method_data(nullptr); 1228 clear_method_counters(); 1229 remove_unshareable_flags(); 1230 } 1231 1232 void Method::remove_unshareable_flags() { 1233 // clear all the flags that shouldn't be in the archived version 1234 assert(!is_old(), "must be"); 1235 assert(!is_obsolete(), "must be"); 1236 assert(!is_deleted(), "must be"); 1237 1238 set_is_prefixed_native(false); 1239 set_queued_for_compilation(false); 1240 set_is_not_c2_compilable(false); 1241 set_is_not_c1_compilable(false); 1242 set_is_not_c2_osr_compilable(false); 1243 set_on_stack_flag(false); 1244 } 1245 #endif 1246 1247 // Called when the method_holder is getting linked. Setup entrypoints so the method 1248 // is ready to be called from interpreter, compiler, and vtables. 1249 void Method::link_method(const methodHandle& h_method, TRAPS) { 1250 // If the code cache is full, we may reenter this function for the 1251 // leftover methods that weren't linked. 1252 if (adapter() != nullptr) { 1253 return; 1254 } 1255 assert( _code == nullptr, "nothing compiled yet" ); 1256 1257 // Setup interpreter entrypoint 1258 assert(this == h_method(), "wrong h_method()" ); 1259 1260 assert(adapter() == nullptr, "init'd to null"); 1261 address entry = Interpreter::entry_for_method(h_method); 1262 assert(entry != nullptr, "interpreter entry must be non-null"); 1263 // Sets both _i2i_entry and _from_interpreted_entry 1264 set_interpreter_entry(entry); 1265 1266 // Don't overwrite already registered native entries. 1267 if (is_native() && !has_native_function()) { 1268 set_native_function( 1269 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1270 !native_bind_event_is_interesting); 1271 } 1272 if (InlineTypeReturnedAsFields && returns_inline_type(THREAD) && !has_scalarized_return()) { 1273 assert(!constMethod()->is_shared(), "Cannot update shared const objects"); 1274 set_has_scalarized_return(); 1275 } 1276 1277 // Setup compiler entrypoint. This is made eagerly, so we do not need 1278 // special handling of vtables. An alternative is to make adapters more 1279 // lazily by calling make_adapter() from from_compiled_entry() for the 1280 // normal calls. For vtable calls life gets more complicated. When a 1281 // call-site goes mega-morphic we need adapters in all methods which can be 1282 // called from the vtable. We need adapters on such methods that get loaded 1283 // later. Ditto for mega-morphic itable calls. If this proves to be a 1284 // problem we'll make these lazily later. 1285 (void) make_adapters(h_method, CHECK); 1286 1287 // ONLY USE the h_method now as make_adapter may have blocked 1288 1289 if (h_method->is_continuation_native_intrinsic()) { 1290 // the entry points to this method will be set in set_code, called when first resolving this method 1291 _from_interpreted_entry = nullptr; 1292 _from_compiled_entry = nullptr; 1293 _i2i_entry = nullptr; 1294 } 1295 } 1296 1297 address Method::make_adapters(const methodHandle& mh, TRAPS) { 1298 // Adapters for compiled code are made eagerly here. They are fairly 1299 // small (generally < 100 bytes) and quick to make (and cached and shared) 1300 // so making them eagerly shouldn't be too expensive. 1301 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1302 if (adapter == nullptr ) { 1303 if (!is_init_completed()) { 1304 // Don't throw exceptions during VM initialization because java.lang.* classes 1305 // might not have been initialized, causing problems when constructing the 1306 // Java exception object. 1307 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1308 } else { 1309 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters"); 1310 } 1311 } 1312 1313 mh->set_adapter_entry(adapter); 1314 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1315 mh->_from_compiled_inline_entry = adapter->get_c2i_inline_entry(); 1316 mh->_from_compiled_inline_ro_entry = adapter->get_c2i_inline_ro_entry(); 1317 return adapter->get_c2i_entry(); 1318 } 1319 1320 // The verified_code_entry() must be called when a invoke is resolved 1321 // on this method. 1322 1323 // It returns the compiled code entry point, after asserting not null. 1324 // This function is called after potential safepoints so that nmethod 1325 // or adapter that it points to is still live and valid. 1326 // This function must not hit a safepoint! 1327 address Method::verified_code_entry() { 1328 debug_only(NoSafepointVerifier nsv;) 1329 assert(_from_compiled_entry != nullptr, "must be set"); 1330 return _from_compiled_entry; 1331 } 1332 1333 address Method::verified_inline_code_entry() { 1334 debug_only(NoSafepointVerifier nsv;) 1335 assert(_from_compiled_inline_entry != nullptr, "must be set"); 1336 return _from_compiled_inline_entry; 1337 } 1338 1339 address Method::verified_inline_ro_code_entry() { 1340 debug_only(NoSafepointVerifier nsv;) 1341 assert(_from_compiled_inline_ro_entry != nullptr, "must be set"); 1342 return _from_compiled_inline_ro_entry; 1343 } 1344 1345 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1346 // (could be racing a deopt). 1347 // Not inline to avoid circular ref. 1348 bool Method::check_code() const { 1349 // cached in a register or local. There's a race on the value of the field. 1350 CompiledMethod *code = Atomic::load_acquire(&_code); 1351 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method()); 1352 } 1353 1354 // Install compiled code. Instantly it can execute. 1355 void Method::set_code(const methodHandle& mh, CompiledMethod *code) { 1356 assert_lock_strong(CompiledMethod_lock); 1357 assert( code, "use clear_code to remove code" ); 1358 assert( mh->check_code(), "" ); 1359 1360 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!"); 1361 1362 // These writes must happen in this order, because the interpreter will 1363 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1364 // which jumps to _from_compiled_entry. 1365 mh->_code = code; // Assign before allowing compiled code to exec 1366 1367 int comp_level = code->comp_level(); 1368 // In theory there could be a race here. In practice it is unlikely 1369 // and not worth worrying about. 1370 if (comp_level > mh->highest_comp_level()) { 1371 mh->set_highest_comp_level(comp_level); 1372 } 1373 1374 OrderAccess::storestore(); 1375 mh->_from_compiled_entry = code->verified_entry_point(); 1376 mh->_from_compiled_inline_entry = code->verified_inline_entry_point(); 1377 mh->_from_compiled_inline_ro_entry = code->verified_inline_ro_entry_point(); 1378 OrderAccess::storestore(); 1379 1380 if (mh->is_continuation_native_intrinsic()) { 1381 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method 1382 1383 if (mh->is_continuation_enter_intrinsic()) { 1384 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted 1385 mh->_i2i_entry = ContinuationEntry::interpreted_entry(); 1386 } else if (mh->is_continuation_yield_intrinsic()) { 1387 mh->_i2i_entry = mh->get_i2c_entry(); 1388 } else { 1389 guarantee(false, "Unknown Continuation native intrinsic"); 1390 } 1391 // This must come last, as it is what's tested in LinkResolver::resolve_static_call 1392 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry()); 1393 } else if (!mh->is_method_handle_intrinsic()) { 1394 // Instantly compiled code can execute. 1395 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1396 } 1397 } 1398 1399 1400 bool Method::is_overridden_in(Klass* k) const { 1401 InstanceKlass* ik = InstanceKlass::cast(k); 1402 1403 if (ik->is_interface()) return false; 1404 1405 // If method is an interface, we skip it - except if it 1406 // is a miranda method 1407 if (method_holder()->is_interface()) { 1408 // Check that method is not a miranda method 1409 if (ik->lookup_method(name(), signature()) == nullptr) { 1410 // No implementation exist - so miranda method 1411 return false; 1412 } 1413 return true; 1414 } 1415 1416 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1417 if (!has_vtable_index()) { 1418 return false; 1419 } else { 1420 Method* vt_m = ik->method_at_vtable(vtable_index()); 1421 return vt_m != this; 1422 } 1423 } 1424 1425 1426 // give advice about whether this Method* should be cached or not 1427 bool Method::should_not_be_cached() const { 1428 if (is_old()) { 1429 // This method has been redefined. It is either EMCP or obsolete 1430 // and we don't want to cache it because that would pin the method 1431 // down and prevent it from being collectible if and when it 1432 // finishes executing. 1433 return true; 1434 } 1435 1436 // caching this method should be just fine 1437 return false; 1438 } 1439 1440 1441 /** 1442 * Returns true if this is one of the specially treated methods for 1443 * security related stack walks (like Reflection.getCallerClass). 1444 */ 1445 bool Method::is_ignored_by_security_stack_walk() const { 1446 if (intrinsic_id() == vmIntrinsics::_invoke) { 1447 // This is Method.invoke() -- ignore it 1448 return true; 1449 } 1450 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) { 1451 // This is an auxiliary frame -- ignore it 1452 return true; 1453 } 1454 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1455 // This is an internal adapter frame for method handles -- ignore it 1456 return true; 1457 } 1458 return false; 1459 } 1460 1461 1462 // Constant pool structure for invoke methods: 1463 enum { 1464 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1465 _imcp_invoke_signature, // utf8: (variable Symbol*) 1466 _imcp_limit 1467 }; 1468 1469 // Test if this method is an MH adapter frame generated by Java code. 1470 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1471 bool Method::is_compiled_lambda_form() const { 1472 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1473 } 1474 1475 // Test if this method is an internal MH primitive method. 1476 bool Method::is_method_handle_intrinsic() const { 1477 vmIntrinsics::ID iid = intrinsic_id(); 1478 return (MethodHandles::is_signature_polymorphic(iid) && 1479 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1480 } 1481 1482 bool Method::has_member_arg() const { 1483 vmIntrinsics::ID iid = intrinsic_id(); 1484 return (MethodHandles::is_signature_polymorphic(iid) && 1485 MethodHandles::has_member_arg(iid)); 1486 } 1487 1488 // Make an instance of a signature-polymorphic internal MH primitive. 1489 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1490 Symbol* signature, 1491 TRAPS) { 1492 ResourceMark rm(THREAD); 1493 methodHandle empty; 1494 1495 InstanceKlass* holder = vmClasses::MethodHandle_klass(); 1496 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1497 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1498 1499 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1500 1501 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1502 name->increment_refcount(); 1503 signature->increment_refcount(); 1504 1505 int cp_length = _imcp_limit; 1506 ClassLoaderData* loader_data = holder->class_loader_data(); 1507 constantPoolHandle cp; 1508 { 1509 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1510 cp = constantPoolHandle(THREAD, cp_oop); 1511 } 1512 cp->copy_fields(holder->constants()); 1513 cp->set_pool_holder(holder); 1514 cp->symbol_at_put(_imcp_invoke_name, name); 1515 cp->symbol_at_put(_imcp_invoke_signature, signature); 1516 cp->set_has_preresolution(); 1517 1518 // decide on access bits: public or not? 1519 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1520 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1521 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1522 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1523 1524 methodHandle m; 1525 { 1526 InlineTableSizes sizes; 1527 Method* m_oop = Method::allocate(loader_data, 0, 1528 accessFlags_from(flags_bits), &sizes, 1529 ConstMethod::NORMAL, 1530 name, 1531 CHECK_(empty)); 1532 m = methodHandle(THREAD, m_oop); 1533 } 1534 m->set_constants(cp()); 1535 m->set_name_index(_imcp_invoke_name); 1536 m->set_signature_index(_imcp_invoke_signature); 1537 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1538 assert(m->signature() == signature, ""); 1539 m->constMethod()->compute_from_signature(signature, must_be_static); 1540 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder())); 1541 assert(m->is_method_handle_intrinsic(), ""); 1542 #ifdef ASSERT 1543 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1544 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1545 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1546 #endif //ASSERT 1547 1548 // Finally, set up its entry points. 1549 assert(m->can_be_statically_bound(), ""); 1550 m->set_vtable_index(Method::nonvirtual_vtable_index); 1551 m->link_method(m, CHECK_(empty)); 1552 1553 if (iid == vmIntrinsics::_linkToNative) { 1554 m->set_interpreter_entry(m->adapter()->get_i2c_entry()); 1555 } 1556 if (log_is_enabled(Debug, methodhandles)) { 1557 LogTarget(Debug, methodhandles) lt; 1558 LogStream ls(lt); 1559 m->print_on(&ls); 1560 } 1561 1562 return m; 1563 } 1564 1565 Klass* Method::check_non_bcp_klass(Klass* klass) { 1566 if (klass != nullptr && klass->class_loader() != nullptr) { 1567 if (klass->is_objArray_klass()) 1568 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1569 return klass; 1570 } 1571 return nullptr; 1572 } 1573 1574 1575 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, 1576 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1577 // Code below does not work for native methods - they should never get rewritten anyway 1578 assert(!m->is_native(), "cannot rewrite native methods"); 1579 // Allocate new Method* 1580 AccessFlags flags = m->access_flags(); 1581 1582 ConstMethod* cm = m->constMethod(); 1583 int checked_exceptions_len = cm->checked_exceptions_length(); 1584 int localvariable_len = cm->localvariable_table_length(); 1585 int exception_table_len = cm->exception_table_length(); 1586 int method_parameters_len = cm->method_parameters_length(); 1587 int method_annotations_len = cm->method_annotations_length(); 1588 int parameter_annotations_len = cm->parameter_annotations_length(); 1589 int type_annotations_len = cm->type_annotations_length(); 1590 int default_annotations_len = cm->default_annotations_length(); 1591 1592 InlineTableSizes sizes( 1593 localvariable_len, 1594 new_compressed_linenumber_size, 1595 exception_table_len, 1596 checked_exceptions_len, 1597 method_parameters_len, 1598 cm->generic_signature_index(), 1599 method_annotations_len, 1600 parameter_annotations_len, 1601 type_annotations_len, 1602 default_annotations_len, 1603 0); 1604 1605 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1606 Method* newm_oop = Method::allocate(loader_data, 1607 new_code_length, 1608 flags, 1609 &sizes, 1610 m->method_type(), 1611 m->name(), 1612 CHECK_(methodHandle())); 1613 methodHandle newm (THREAD, newm_oop); 1614 1615 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1616 ConstMethod* newcm = newm->constMethod(); 1617 int new_const_method_size = newm->constMethod()->size(); 1618 1619 // This works because the source and target are both Methods. Some compilers 1620 // (e.g., clang) complain that the target vtable pointer will be stomped, 1621 // so cast away newm()'s and m()'s Methodness. 1622 memcpy((void*)newm(), (void*)m(), sizeof(Method)); 1623 1624 // Create shallow copy of ConstMethod. 1625 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1626 1627 // Reset correct method/const method, method size, and parameter info 1628 newm->set_constMethod(newcm); 1629 newm->constMethod()->set_code_size(new_code_length); 1630 newm->constMethod()->set_constMethod_size(new_const_method_size); 1631 assert(newm->code_size() == new_code_length, "check"); 1632 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1633 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1634 assert(newm->exception_table_length() == exception_table_len, "check"); 1635 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1636 // Copy new byte codes 1637 memcpy(newm->code_base(), new_code, new_code_length); 1638 // Copy line number table 1639 if (new_compressed_linenumber_size > 0) { 1640 memcpy(newm->compressed_linenumber_table(), 1641 new_compressed_linenumber_table, 1642 new_compressed_linenumber_size); 1643 } 1644 // Copy method_parameters 1645 if (method_parameters_len > 0) { 1646 memcpy(newm->method_parameters_start(), 1647 m->method_parameters_start(), 1648 method_parameters_len * sizeof(MethodParametersElement)); 1649 } 1650 // Copy checked_exceptions 1651 if (checked_exceptions_len > 0) { 1652 memcpy(newm->checked_exceptions_start(), 1653 m->checked_exceptions_start(), 1654 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1655 } 1656 // Copy exception table 1657 if (exception_table_len > 0) { 1658 memcpy(newm->exception_table_start(), 1659 m->exception_table_start(), 1660 exception_table_len * sizeof(ExceptionTableElement)); 1661 } 1662 // Copy local variable number table 1663 if (localvariable_len > 0) { 1664 memcpy(newm->localvariable_table_start(), 1665 m->localvariable_table_start(), 1666 localvariable_len * sizeof(LocalVariableTableElement)); 1667 } 1668 // Copy stackmap table 1669 if (m->has_stackmap_table()) { 1670 int code_attribute_length = m->stackmap_data()->length(); 1671 Array<u1>* stackmap_data = 1672 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle())); 1673 memcpy((void*)stackmap_data->adr_at(0), 1674 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1675 newm->set_stackmap_data(stackmap_data); 1676 } 1677 1678 // copy annotations over to new method 1679 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle())); 1680 return newm; 1681 } 1682 1683 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) { 1684 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics 1685 // because we are not loading from core libraries 1686 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1687 // which does not use the class default class loader so we check for its loader here 1688 const InstanceKlass* ik = InstanceKlass::cast(holder); 1689 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1690 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here 1691 } 1692 1693 // see if the klass name is well-known: 1694 Symbol* klass_name = ik->name(); 1695 vmSymbolID id = vmSymbols::find_sid(klass_name); 1696 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) { 1697 return id; 1698 } else { 1699 return vmSymbolID::NO_SID; 1700 } 1701 } 1702 1703 void Method::init_intrinsic_id(vmSymbolID klass_id) { 1704 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once"); 1705 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1706 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1707 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1708 1709 // the klass name is well-known: 1710 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be"); 1711 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility"); 1712 1713 // ditto for method and signature: 1714 vmSymbolID name_id = vmSymbols::find_sid(name()); 1715 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1716 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1717 && name_id == vmSymbolID::NO_SID) { 1718 return; 1719 } 1720 vmSymbolID sig_id = vmSymbols::find_sid(signature()); 1721 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1722 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1723 && sig_id == vmSymbolID::NO_SID) { 1724 return; 1725 } 1726 jshort flags = access_flags().as_short(); 1727 1728 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1729 if (id != vmIntrinsics::_none) { 1730 set_intrinsic_id(id); 1731 if (id == vmIntrinsics::_Class_cast) { 1732 // Even if the intrinsic is rejected, we want to inline this simple method. 1733 set_force_inline(); 1734 } 1735 return; 1736 } 1737 1738 // A few slightly irregular cases: 1739 switch (klass_id) { 1740 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1741 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1742 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1743 if (!is_native()) break; 1744 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1745 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1746 id = vmIntrinsics::_none; 1747 break; 1748 1749 default: 1750 break; 1751 } 1752 1753 if (id != vmIntrinsics::_none) { 1754 // Set up its iid. It is an alias method. 1755 set_intrinsic_id(id); 1756 return; 1757 } 1758 } 1759 1760 bool Method::load_signature_classes(const methodHandle& m, TRAPS) { 1761 if (!THREAD->can_call_java()) { 1762 // There is nothing useful this routine can do from within the Compile thread. 1763 // Hopefully, the signature contains only well-known classes. 1764 // We could scan for this and return true/false, but the caller won't care. 1765 return false; 1766 } 1767 bool sig_is_loaded = true; 1768 ResourceMark rm(THREAD); 1769 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) { 1770 if (ss.is_reference()) { 1771 // load everything, including arrays "[Lfoo;" 1772 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD); 1773 // We are loading classes eagerly. If a ClassNotFoundException or 1774 // a LinkageError was generated, be sure to ignore it. 1775 if (HAS_PENDING_EXCEPTION) { 1776 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) || 1777 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) { 1778 CLEAR_PENDING_EXCEPTION; 1779 } else { 1780 return false; 1781 } 1782 } 1783 if( klass == nullptr) { sig_is_loaded = false; } 1784 } 1785 } 1786 return sig_is_loaded; 1787 } 1788 1789 // Exposed so field engineers can debug VM 1790 void Method::print_short_name(outputStream* st) const { 1791 ResourceMark rm; 1792 #ifdef PRODUCT 1793 st->print(" %s::", method_holder()->external_name()); 1794 #else 1795 st->print(" %s::", method_holder()->internal_name()); 1796 #endif 1797 name()->print_symbol_on(st); 1798 if (WizardMode) signature()->print_symbol_on(st); 1799 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1800 MethodHandles::print_as_basic_type_signature_on(st, signature()); 1801 } 1802 1803 // Comparer for sorting an object array containing 1804 // Method*s. 1805 static int method_comparator(Method* a, Method* b) { 1806 return a->name()->fast_compare(b->name()); 1807 } 1808 1809 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1810 // default_methods also uses this without the ordering for fast find_method 1811 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) { 1812 int length = methods->length(); 1813 if (length > 1) { 1814 if (func == nullptr) { 1815 func = method_comparator; 1816 } 1817 { 1818 NoSafepointVerifier nsv; 1819 QuickSort::sort(methods->data(), length, func, /*idempotent=*/false); 1820 } 1821 // Reset method ordering 1822 if (set_idnums) { 1823 for (u2 i = 0; i < length; i++) { 1824 Method* m = methods->at(i); 1825 m->set_method_idnum(i); 1826 m->set_orig_method_idnum(i); 1827 } 1828 } 1829 } 1830 } 1831 1832 //----------------------------------------------------------------------------------- 1833 // Non-product code unless JVM/TI needs it 1834 1835 #if !defined(PRODUCT) || INCLUDE_JVMTI 1836 class SignatureTypePrinter : public SignatureTypeNames { 1837 private: 1838 outputStream* _st; 1839 bool _use_separator; 1840 1841 void type_name(const char* name) { 1842 if (_use_separator) _st->print(", "); 1843 _st->print("%s", name); 1844 _use_separator = true; 1845 } 1846 1847 public: 1848 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1849 _st = st; 1850 _use_separator = false; 1851 } 1852 1853 void print_parameters() { _use_separator = false; do_parameters_on(this); } 1854 void print_returntype() { _use_separator = false; do_type(return_type()); } 1855 }; 1856 1857 1858 void Method::print_name(outputStream* st) const { 1859 Thread *thread = Thread::current(); 1860 ResourceMark rm(thread); 1861 st->print("%s ", is_static() ? "static" : "virtual"); 1862 if (WizardMode) { 1863 st->print("%s.", method_holder()->internal_name()); 1864 name()->print_symbol_on(st); 1865 signature()->print_symbol_on(st); 1866 } else { 1867 SignatureTypePrinter sig(signature(), st); 1868 sig.print_returntype(); 1869 st->print(" %s.", method_holder()->internal_name()); 1870 name()->print_symbol_on(st); 1871 st->print("("); 1872 sig.print_parameters(); 1873 st->print(")"); 1874 } 1875 } 1876 #endif // !PRODUCT || INCLUDE_JVMTI 1877 1878 1879 void Method::print_codes_on(outputStream* st, int flags) const { 1880 print_codes_on(0, code_size(), st, flags); 1881 } 1882 1883 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const { 1884 Thread *thread = Thread::current(); 1885 ResourceMark rm(thread); 1886 methodHandle mh (thread, (Method*)this); 1887 BytecodeTracer::print_method_codes(mh, from, to, st, flags); 1888 } 1889 1890 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1891 _bci = 0; 1892 _line = 0; 1893 }; 1894 1895 bool CompressedLineNumberReadStream::read_pair() { 1896 jubyte next = read_byte(); 1897 // Check for terminator 1898 if (next == 0) return false; 1899 if (next == 0xFF) { 1900 // Escape character, regular compression used 1901 _bci += read_signed_int(); 1902 _line += read_signed_int(); 1903 } else { 1904 // Single byte compression used 1905 _bci += next >> 3; 1906 _line += next & 0x7; 1907 } 1908 return true; 1909 } 1910 1911 #if INCLUDE_JVMTI 1912 1913 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1914 BreakpointInfo* bp = method_holder()->breakpoints(); 1915 for (; bp != nullptr; bp = bp->next()) { 1916 if (bp->match(this, bci)) { 1917 return bp->orig_bytecode(); 1918 } 1919 } 1920 { 1921 ResourceMark rm; 1922 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1923 } 1924 return Bytecodes::_shouldnotreachhere; 1925 } 1926 1927 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1928 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1929 BreakpointInfo* bp = method_holder()->breakpoints(); 1930 for (; bp != nullptr; bp = bp->next()) { 1931 if (bp->match(this, bci)) { 1932 bp->set_orig_bytecode(code); 1933 // and continue, in case there is more than one 1934 } 1935 } 1936 } 1937 1938 void Method::set_breakpoint(int bci) { 1939 InstanceKlass* ik = method_holder(); 1940 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1941 bp->set_next(ik->breakpoints()); 1942 ik->set_breakpoints(bp); 1943 // do this last: 1944 bp->set(this); 1945 } 1946 1947 static void clear_matches(Method* m, int bci) { 1948 InstanceKlass* ik = m->method_holder(); 1949 BreakpointInfo* prev_bp = nullptr; 1950 BreakpointInfo* next_bp; 1951 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) { 1952 next_bp = bp->next(); 1953 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1954 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1955 // do this first: 1956 bp->clear(m); 1957 // unhook it 1958 if (prev_bp != nullptr) 1959 prev_bp->set_next(next_bp); 1960 else 1961 ik->set_breakpoints(next_bp); 1962 delete bp; 1963 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1964 // at same location. So we have multiple matching (method_index and bci) 1965 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1966 // breakpoint for clear_breakpoint request and keep all other method versions 1967 // BreakpointInfo for future clear_breakpoint request. 1968 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1969 // which is being called when class is unloaded. We delete all the Breakpoint 1970 // information for all versions of method. We may not correctly restore the original 1971 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1972 // so these methods won't be used anymore. 1973 if (bci >= 0) { 1974 break; 1975 } 1976 } else { 1977 // This one is a keeper. 1978 prev_bp = bp; 1979 } 1980 } 1981 } 1982 1983 void Method::clear_breakpoint(int bci) { 1984 assert(bci >= 0, ""); 1985 clear_matches(this, bci); 1986 } 1987 1988 void Method::clear_all_breakpoints() { 1989 clear_matches(this, -1); 1990 } 1991 1992 #endif // INCLUDE_JVMTI 1993 1994 int Method::invocation_count() const { 1995 MethodCounters* mcs = method_counters(); 1996 MethodData* mdo = method_data(); 1997 if (((mcs != nullptr) ? mcs->invocation_counter()->carry() : false) || 1998 ((mdo != nullptr) ? mdo->invocation_counter()->carry() : false)) { 1999 return InvocationCounter::count_limit; 2000 } else { 2001 return ((mcs != nullptr) ? mcs->invocation_counter()->count() : 0) + 2002 ((mdo != nullptr) ? mdo->invocation_counter()->count() : 0); 2003 } 2004 } 2005 2006 int Method::backedge_count() const { 2007 MethodCounters* mcs = method_counters(); 2008 MethodData* mdo = method_data(); 2009 if (((mcs != nullptr) ? mcs->backedge_counter()->carry() : false) || 2010 ((mdo != nullptr) ? mdo->backedge_counter()->carry() : false)) { 2011 return InvocationCounter::count_limit; 2012 } else { 2013 return ((mcs != nullptr) ? mcs->backedge_counter()->count() : 0) + 2014 ((mdo != nullptr) ? mdo->backedge_counter()->count() : 0); 2015 } 2016 } 2017 2018 int Method::highest_comp_level() const { 2019 const MethodCounters* mcs = method_counters(); 2020 if (mcs != nullptr) { 2021 return mcs->highest_comp_level(); 2022 } else { 2023 return CompLevel_none; 2024 } 2025 } 2026 2027 int Method::highest_osr_comp_level() const { 2028 const MethodCounters* mcs = method_counters(); 2029 if (mcs != nullptr) { 2030 return mcs->highest_osr_comp_level(); 2031 } else { 2032 return CompLevel_none; 2033 } 2034 } 2035 2036 void Method::set_highest_comp_level(int level) { 2037 MethodCounters* mcs = method_counters(); 2038 if (mcs != nullptr) { 2039 mcs->set_highest_comp_level(level); 2040 } 2041 } 2042 2043 void Method::set_highest_osr_comp_level(int level) { 2044 MethodCounters* mcs = method_counters(); 2045 if (mcs != nullptr) { 2046 mcs->set_highest_osr_comp_level(level); 2047 } 2048 } 2049 2050 #if INCLUDE_JVMTI 2051 2052 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 2053 _bci = bci; 2054 _name_index = m->name_index(); 2055 _signature_index = m->signature_index(); 2056 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 2057 if (_orig_bytecode == Bytecodes::_breakpoint) 2058 _orig_bytecode = m->orig_bytecode_at(_bci); 2059 _next = nullptr; 2060 } 2061 2062 void BreakpointInfo::set(Method* method) { 2063 #ifdef ASSERT 2064 { 2065 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 2066 if (code == Bytecodes::_breakpoint) 2067 code = method->orig_bytecode_at(_bci); 2068 assert(orig_bytecode() == code, "original bytecode must be the same"); 2069 } 2070 #endif 2071 Thread *thread = Thread::current(); 2072 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 2073 method->incr_number_of_breakpoints(thread); 2074 { 2075 // Deoptimize all dependents on this method 2076 HandleMark hm(thread); 2077 methodHandle mh(thread, method); 2078 CodeCache::mark_dependents_on_method_for_breakpoint(mh); 2079 } 2080 } 2081 2082 void BreakpointInfo::clear(Method* method) { 2083 *method->bcp_from(_bci) = orig_bytecode(); 2084 assert(method->number_of_breakpoints() > 0, "must not go negative"); 2085 method->decr_number_of_breakpoints(Thread::current()); 2086 } 2087 2088 #endif // INCLUDE_JVMTI 2089 2090 // jmethodID handling 2091 2092 // This is a block allocating object, sort of like JNIHandleBlock, only a 2093 // lot simpler. 2094 // It's allocated on the CHeap because once we allocate a jmethodID, we can 2095 // never get rid of it. 2096 2097 static const int min_block_size = 8; 2098 2099 class JNIMethodBlockNode : public CHeapObj<mtClass> { 2100 friend class JNIMethodBlock; 2101 Method** _methods; 2102 int _number_of_methods; 2103 int _top; 2104 JNIMethodBlockNode* _next; 2105 2106 public: 2107 2108 JNIMethodBlockNode(int num_methods = min_block_size); 2109 2110 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 2111 2112 void ensure_methods(int num_addl_methods) { 2113 if (_top < _number_of_methods) { 2114 num_addl_methods -= _number_of_methods - _top; 2115 if (num_addl_methods <= 0) { 2116 return; 2117 } 2118 } 2119 if (_next == nullptr) { 2120 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 2121 } else { 2122 _next->ensure_methods(num_addl_methods); 2123 } 2124 } 2125 }; 2126 2127 class JNIMethodBlock : public CHeapObj<mtClass> { 2128 JNIMethodBlockNode _head; 2129 JNIMethodBlockNode *_last_free; 2130 public: 2131 static Method* const _free_method; 2132 2133 JNIMethodBlock(int initial_capacity = min_block_size) 2134 : _head(initial_capacity), _last_free(&_head) {} 2135 2136 void ensure_methods(int num_addl_methods) { 2137 _last_free->ensure_methods(num_addl_methods); 2138 } 2139 2140 Method** add_method(Method* m) { 2141 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) { 2142 if (b->_top < b->_number_of_methods) { 2143 // top points to the next free entry. 2144 int i = b->_top; 2145 b->_methods[i] = m; 2146 b->_top++; 2147 _last_free = b; 2148 return &(b->_methods[i]); 2149 } else if (b->_top == b->_number_of_methods) { 2150 // if the next free entry ran off the block see if there's a free entry 2151 for (int i = 0; i < b->_number_of_methods; i++) { 2152 if (b->_methods[i] == _free_method) { 2153 b->_methods[i] = m; 2154 _last_free = b; 2155 return &(b->_methods[i]); 2156 } 2157 } 2158 // Only check each block once for frees. They're very unlikely. 2159 // Increment top past the end of the block. 2160 b->_top++; 2161 } 2162 // need to allocate a next block. 2163 if (b->_next == nullptr) { 2164 b->_next = _last_free = new JNIMethodBlockNode(); 2165 } 2166 } 2167 guarantee(false, "Should always allocate a free block"); 2168 return nullptr; 2169 } 2170 2171 bool contains(Method** m) { 2172 if (m == nullptr) return false; 2173 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2174 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2175 // This is a bit of extra checking, for two reasons. One is 2176 // that contains() deals with pointers that are passed in by 2177 // JNI code, so making sure that the pointer is aligned 2178 // correctly is valuable. The other is that <= and > are 2179 // technically not defined on pointers, so the if guard can 2180 // pass spuriously; no modern compiler is likely to make that 2181 // a problem, though (and if one did, the guard could also 2182 // fail spuriously, which would be bad). 2183 ptrdiff_t idx = m - b->_methods; 2184 if (b->_methods + idx == m) { 2185 return true; 2186 } 2187 } 2188 } 2189 return false; // not found 2190 } 2191 2192 // Doesn't really destroy it, just marks it as free so it can be reused. 2193 void destroy_method(Method** m) { 2194 #ifdef ASSERT 2195 assert(contains(m), "should be a methodID"); 2196 #endif // ASSERT 2197 *m = _free_method; 2198 } 2199 2200 // During class unloading the methods are cleared, which is different 2201 // than freed. 2202 void clear_all_methods() { 2203 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2204 for (int i = 0; i< b->_number_of_methods; i++) { 2205 b->_methods[i] = nullptr; 2206 } 2207 } 2208 } 2209 #ifndef PRODUCT 2210 int count_methods() { 2211 // count all allocated methods 2212 int count = 0; 2213 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2214 for (int i = 0; i< b->_number_of_methods; i++) { 2215 if (b->_methods[i] != _free_method) count++; 2216 } 2217 } 2218 return count; 2219 } 2220 #endif // PRODUCT 2221 }; 2222 2223 // Something that can't be mistaken for an address or a markWord 2224 Method* const JNIMethodBlock::_free_method = (Method*)55; 2225 2226 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) { 2227 _number_of_methods = MAX2(num_methods, min_block_size); 2228 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2229 for (int i = 0; i < _number_of_methods; i++) { 2230 _methods[i] = JNIMethodBlock::_free_method; 2231 } 2232 } 2233 2234 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) { 2235 // Have to add jmethod_ids() to class loader data thread-safely. 2236 // Also have to add the method to the list safely, which the lock 2237 // protects as well. 2238 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag); 2239 if (cld->jmethod_ids() == nullptr) { 2240 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2241 } else { 2242 cld->jmethod_ids()->ensure_methods(capacity); 2243 } 2244 } 2245 2246 // Add a method id to the jmethod_ids 2247 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) { 2248 // Have to add jmethod_ids() to class loader data thread-safely. 2249 // Also have to add the method to the list safely, which the lock 2250 // protects as well. 2251 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check"); 2252 if (cld->jmethod_ids() == nullptr) { 2253 cld->set_jmethod_ids(new JNIMethodBlock()); 2254 } 2255 // jmethodID is a pointer to Method* 2256 return (jmethodID)cld->jmethod_ids()->add_method(m); 2257 } 2258 2259 jmethodID Method::jmethod_id() { 2260 methodHandle mh(Thread::current(), this); 2261 return method_holder()->get_jmethod_id(mh); 2262 } 2263 2264 // Mark a jmethodID as free. This is called when there is a data race in 2265 // InstanceKlass while creating the jmethodID cache. 2266 void Method::destroy_jmethod_id(ClassLoaderData* cld, jmethodID m) { 2267 Method** ptr = (Method**)m; 2268 assert(cld->jmethod_ids() != nullptr, "should have method handles"); 2269 cld->jmethod_ids()->destroy_method(ptr); 2270 } 2271 2272 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2273 // Can't assert the method_holder is the same because the new method has the 2274 // scratch method holder. 2275 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2276 == new_method->method_holder()->class_loader() || 2277 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution 2278 "changing to a different class loader"); 2279 // Just change the method in place, jmethodID pointer doesn't change. 2280 *((Method**)jmid) = new_method; 2281 } 2282 2283 bool Method::is_method_id(jmethodID mid) { 2284 Method* m = resolve_jmethod_id(mid); 2285 assert(m != nullptr, "should be called with non-null method"); 2286 InstanceKlass* ik = m->method_holder(); 2287 ClassLoaderData* cld = ik->class_loader_data(); 2288 if (cld->jmethod_ids() == nullptr) return false; 2289 return (cld->jmethod_ids()->contains((Method**)mid)); 2290 } 2291 2292 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2293 if (mid == nullptr) return nullptr; 2294 Method* o = resolve_jmethod_id(mid); 2295 if (o == nullptr || o == JNIMethodBlock::_free_method) { 2296 return nullptr; 2297 } 2298 // Method should otherwise be valid. Assert for testing. 2299 assert(is_valid_method(o), "should be valid jmethodid"); 2300 // If the method's class holder object is unreferenced, but not yet marked as 2301 // unloaded, we need to return null here too because after a safepoint, its memory 2302 // will be reclaimed. 2303 return o->method_holder()->is_loader_alive() ? o : nullptr; 2304 }; 2305 2306 void Method::set_on_stack(const bool value) { 2307 // Set both the method itself and its constant pool. The constant pool 2308 // on stack means some method referring to it is also on the stack. 2309 constants()->set_on_stack(value); 2310 2311 bool already_set = on_stack_flag(); 2312 set_on_stack_flag(value); 2313 if (value && !already_set) { 2314 MetadataOnStackMark::record(this); 2315 } 2316 } 2317 2318 void Method::record_gc_epoch() { 2319 // If any method is on the stack in continuations, none of them can be reclaimed, 2320 // so save the marking cycle to check for the whole class in the cpCache. 2321 // The cpCache is writeable. 2322 constants()->cache()->record_gc_epoch(); 2323 } 2324 2325 // Called when the class loader is unloaded to make all methods weak. 2326 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2327 loader_data->jmethod_ids()->clear_all_methods(); 2328 } 2329 2330 bool Method::has_method_vptr(const void* ptr) { 2331 Method m; 2332 // This assumes that the vtbl pointer is the first word of a C++ object. 2333 return dereference_vptr(&m) == dereference_vptr(ptr); 2334 } 2335 2336 // Check that this pointer is valid by checking that the vtbl pointer matches 2337 bool Method::is_valid_method(const Method* m) { 2338 if (m == nullptr) { 2339 return false; 2340 } else if ((intptr_t(m) & (wordSize-1)) != 0) { 2341 // Quick sanity check on pointer. 2342 return false; 2343 } else if (!os::is_readable_range(m, m + 1)) { 2344 return false; 2345 } else if (m->is_shared()) { 2346 return CppVtables::is_valid_shared_method(m); 2347 } else if (Metaspace::contains_non_shared(m)) { 2348 return has_method_vptr((const void*)m); 2349 } else { 2350 return false; 2351 } 2352 } 2353 2354 bool Method::is_scalarized_arg(int idx) const { 2355 if (!has_scalarized_args()) { 2356 return false; 2357 } 2358 // Search through signature and check if argument is wrapped in T_PRIMITIVE_OBJECT/T_VOID 2359 int depth = 0; 2360 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc(); 2361 for (int i = 0; i < sig->length(); i++) { 2362 BasicType bt = sig->at(i)._bt; 2363 if (bt == T_PRIMITIVE_OBJECT) { 2364 depth++; 2365 } 2366 if (idx == 0) { 2367 break; // Argument found 2368 } 2369 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) { 2370 depth--; 2371 } 2372 if (depth == 0 && bt != T_LONG && bt != T_DOUBLE) { 2373 idx--; // Advance to next argument 2374 } 2375 } 2376 return depth != 0; 2377 } 2378 2379 #ifndef PRODUCT 2380 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) { 2381 out->print("%d", loader_data->jmethod_ids()->count_methods()); 2382 } 2383 #endif // PRODUCT 2384 2385 2386 // Printing 2387 2388 #ifndef PRODUCT 2389 2390 void Method::print_on(outputStream* st) const { 2391 ResourceMark rm; 2392 assert(is_method(), "must be method"); 2393 st->print_cr("%s", internal_name()); 2394 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this)); 2395 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2396 st->print (" - constants: " PTR_FORMAT " ", p2i(constants())); 2397 constants()->print_value_on(st); st->cr(); 2398 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2399 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr(); 2400 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2401 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2402 st->print_cr(" - max stack: %d", max_stack()); 2403 st->print_cr(" - max locals: %d", max_locals()); 2404 st->print_cr(" - size of params: %d", size_of_parameters()); 2405 st->print_cr(" - method size: %d", method_size()); 2406 if (intrinsic_id() != vmIntrinsics::_none) 2407 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id())); 2408 if (highest_comp_level() != CompLevel_none) 2409 st->print_cr(" - highest level: %d", highest_comp_level()); 2410 st->print_cr(" - vtable index: %d", _vtable_index); 2411 #ifdef ASSERT 2412 if (valid_itable_index()) 2413 st->print_cr(" - itable index: %d", itable_index()); 2414 #endif 2415 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry())); 2416 st->print( " - adapters: "); 2417 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2418 if (a == nullptr) 2419 st->print_cr(PTR_FORMAT, p2i(a)); 2420 else 2421 a->print_adapter_on(st); 2422 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry())); 2423 st->print_cr(" - compiled inline entry " PTR_FORMAT, p2i(from_compiled_inline_entry())); 2424 st->print_cr(" - compiled inline ro entry " PTR_FORMAT, p2i(from_compiled_inline_ro_entry())); 2425 st->print_cr(" - code size: %d", code_size()); 2426 if (code_size() != 0) { 2427 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base())); 2428 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size())); 2429 } 2430 if (method_data() != nullptr) { 2431 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data())); 2432 } 2433 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2434 if (checked_exceptions_length() > 0) { 2435 CheckedExceptionElement* table = checked_exceptions_start(); 2436 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table)); 2437 if (Verbose) { 2438 for (int i = 0; i < checked_exceptions_length(); i++) { 2439 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2440 } 2441 } 2442 } 2443 if (has_linenumber_table()) { 2444 u_char* table = compressed_linenumber_table(); 2445 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table)); 2446 if (Verbose) { 2447 CompressedLineNumberReadStream stream(table); 2448 while (stream.read_pair()) { 2449 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2450 } 2451 } 2452 } 2453 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2454 if (localvariable_table_length() > 0) { 2455 LocalVariableTableElement* table = localvariable_table_start(); 2456 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table)); 2457 if (Verbose) { 2458 for (int i = 0; i < localvariable_table_length(); i++) { 2459 int bci = table[i].start_bci; 2460 int len = table[i].length; 2461 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2462 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2463 int slot = table[i].slot; 2464 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2465 } 2466 } 2467 } 2468 if (code() != nullptr) { 2469 st->print (" - compiled code: "); 2470 code()->print_value_on(st); 2471 } 2472 if (is_native()) { 2473 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function())); 2474 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler())); 2475 } 2476 } 2477 2478 void Method::print_linkage_flags(outputStream* st) { 2479 access_flags().print_on(st); 2480 if (is_default_method()) { 2481 st->print("default "); 2482 } 2483 if (is_overpass()) { 2484 st->print("overpass "); 2485 } 2486 } 2487 #endif //PRODUCT 2488 2489 void Method::print_value_on(outputStream* st) const { 2490 assert(is_method(), "must be method"); 2491 st->print("%s", internal_name()); 2492 print_address_on(st); 2493 st->print(" "); 2494 if (WizardMode) access_flags().print_on(st); 2495 name()->print_value_on(st); 2496 st->print(" "); 2497 signature()->print_value_on(st); 2498 st->print(" in "); 2499 method_holder()->print_value_on(st); 2500 if (WizardMode) st->print("#%d", _vtable_index); 2501 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2502 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code()); 2503 } 2504 2505 // Verification 2506 2507 void Method::verify_on(outputStream* st) { 2508 guarantee(is_method(), "object must be method"); 2509 guarantee(constants()->is_constantPool(), "should be constant pool"); 2510 MethodData* md = method_data(); 2511 guarantee(md == nullptr || 2512 md->is_methodData(), "should be method data"); 2513 }