1 /* 2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "cds/cdsConfig.hpp" 27 #include "cds/cppVtables.hpp" 28 #include "cds/metaspaceShared.hpp" 29 #include "classfile/classLoader.hpp" 30 #include "classfile/classLoaderDataGraph.hpp" 31 #include "classfile/metadataOnStackMark.hpp" 32 #include "classfile/symbolTable.hpp" 33 #include "classfile/systemDictionary.hpp" 34 #include "classfile/vmClasses.hpp" 35 #include "code/codeCache.hpp" 36 #include "code/debugInfoRec.hpp" 37 #include "compiler/compilationPolicy.hpp" 38 #include "gc/shared/collectedHeap.inline.hpp" 39 #include "interpreter/bytecodeStream.hpp" 40 #include "interpreter/bytecodeTracer.hpp" 41 #include "interpreter/bytecodes.hpp" 42 #include "interpreter/interpreter.hpp" 43 #include "interpreter/oopMapCache.hpp" 44 #include "logging/log.hpp" 45 #include "logging/logStream.hpp" 46 #include "logging/logTag.hpp" 47 #include "memory/allocation.inline.hpp" 48 #include "memory/metadataFactory.hpp" 49 #include "memory/metaspaceClosure.hpp" 50 #include "memory/oopFactory.hpp" 51 #include "memory/resourceArea.hpp" 52 #include "memory/universe.hpp" 53 #include "nmt/memTracker.hpp" 54 #include "oops/constMethod.hpp" 55 #include "oops/constantPool.hpp" 56 #include "oops/klass.inline.hpp" 57 #include "oops/method.inline.hpp" 58 #include "oops/methodData.hpp" 59 #include "oops/objArrayKlass.hpp" 60 #include "oops/objArrayOop.inline.hpp" 61 #include "oops/oop.inline.hpp" 62 #include "oops/symbol.hpp" 63 #include "oops/inlineKlass.inline.hpp" 64 #include "prims/jvmtiExport.hpp" 65 #include "prims/methodHandles.hpp" 66 #include "runtime/atomic.hpp" 67 #include "runtime/arguments.hpp" 68 #include "runtime/continuationEntry.hpp" 69 #include "runtime/frame.inline.hpp" 70 #include "runtime/handles.inline.hpp" 71 #include "runtime/init.hpp" 72 #include "runtime/java.hpp" 73 #include "runtime/orderAccess.hpp" 74 #include "runtime/perfData.hpp" 75 #include "runtime/relocator.hpp" 76 #include "runtime/safepointVerifiers.hpp" 77 #include "runtime/sharedRuntime.hpp" 78 #include "runtime/signature.hpp" 79 #include "runtime/threads.hpp" 80 #include "runtime/vm_version.hpp" 81 #include "utilities/align.hpp" 82 #include "utilities/quickSort.hpp" 83 #include "utilities/vmError.hpp" 84 #include "utilities/xmlstream.hpp" 85 86 // Implementation of Method 87 88 Method* Method::allocate(ClassLoaderData* loader_data, 89 int byte_code_size, 90 AccessFlags access_flags, 91 InlineTableSizes* sizes, 92 ConstMethod::MethodType method_type, 93 Symbol* name, 94 TRAPS) { 95 assert(!access_flags.is_native() || byte_code_size == 0, 96 "native methods should not contain byte codes"); 97 ConstMethod* cm = ConstMethod::allocate(loader_data, 98 byte_code_size, 99 sizes, 100 method_type, 101 CHECK_NULL); 102 int size = Method::size(access_flags.is_native()); 103 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name); 104 } 105 106 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) { 107 NoSafepointVerifier no_safepoint; 108 set_constMethod(xconst); 109 set_access_flags(access_flags); 110 set_intrinsic_id(vmIntrinsics::_none); 111 clear_method_data(); 112 clear_method_counters(); 113 set_vtable_index(Method::garbage_vtable_index); 114 115 // Fix and bury in Method* 116 set_interpreter_entry(nullptr); // sets i2i entry and from_int 117 set_adapter_entry(nullptr); 118 Method::clear_code(); // from_c/from_i get set to c2i/i2i 119 120 if (access_flags.is_native()) { 121 clear_native_function(); 122 set_signature_handler(nullptr); 123 } 124 NOT_PRODUCT(set_compiled_invocation_count(0);) 125 // Name is very useful for debugging. 126 NOT_PRODUCT(_name = name;) 127 } 128 129 // Release Method*. The nmethod will be gone when we get here because 130 // we've walked the code cache. 131 void Method::deallocate_contents(ClassLoaderData* loader_data) { 132 MetadataFactory::free_metadata(loader_data, constMethod()); 133 set_constMethod(nullptr); 134 MetadataFactory::free_metadata(loader_data, method_data()); 135 clear_method_data(); 136 MetadataFactory::free_metadata(loader_data, method_counters()); 137 clear_method_counters(); 138 // The nmethod will be gone when we get here. 139 if (code() != nullptr) _code = nullptr; 140 } 141 142 void Method::release_C_heap_structures() { 143 if (method_data()) { 144 method_data()->release_C_heap_structures(); 145 146 // Destroy MethodData embedded lock 147 method_data()->~MethodData(); 148 } 149 } 150 151 address Method::get_i2c_entry() { 152 assert(adapter() != nullptr, "must have"); 153 return adapter()->get_i2c_entry(); 154 } 155 156 address Method::get_c2i_entry() { 157 assert(adapter() != nullptr, "must have"); 158 return adapter()->get_c2i_entry(); 159 } 160 161 address Method::get_c2i_inline_entry() { 162 assert(adapter() != nullptr, "must have"); 163 return adapter()->get_c2i_inline_entry(); 164 } 165 166 address Method::get_c2i_unverified_entry() { 167 assert(adapter() != nullptr, "must have"); 168 return adapter()->get_c2i_unverified_entry(); 169 } 170 171 address Method::get_c2i_unverified_inline_entry() { 172 assert(adapter() != nullptr, "must have"); 173 return adapter()->get_c2i_unverified_inline_entry(); 174 } 175 176 address Method::get_c2i_no_clinit_check_entry() { 177 assert(VM_Version::supports_fast_class_init_checks(), ""); 178 assert(adapter() != nullptr, "must have"); 179 return adapter()->get_c2i_no_clinit_check_entry(); 180 } 181 182 char* Method::name_and_sig_as_C_string() const { 183 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 184 } 185 186 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 187 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 188 } 189 190 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 191 const char* klass_name = klass->external_name(); 192 int klass_name_len = (int)strlen(klass_name); 193 int method_name_len = method_name->utf8_length(); 194 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 195 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 196 strcpy(dest, klass_name); 197 dest[klass_name_len] = '.'; 198 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 199 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 200 dest[len] = 0; 201 return dest; 202 } 203 204 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 205 Symbol* klass_name = klass->name(); 206 klass_name->as_klass_external_name(buf, size); 207 int len = (int)strlen(buf); 208 209 if (len < size - 1) { 210 buf[len++] = '.'; 211 212 method_name->as_C_string(&(buf[len]), size - len); 213 len = (int)strlen(buf); 214 215 signature->as_C_string(&(buf[len]), size - len); 216 } 217 218 return buf; 219 } 220 221 const char* Method::external_name() const { 222 return external_name(constants()->pool_holder(), name(), signature()); 223 } 224 225 void Method::print_external_name(outputStream *os) const { 226 print_external_name(os, constants()->pool_holder(), name(), signature()); 227 } 228 229 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) { 230 stringStream ss; 231 print_external_name(&ss, klass, method_name, signature); 232 return ss.as_string(); 233 } 234 235 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) { 236 signature->print_as_signature_external_return_type(os); 237 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string()); 238 signature->print_as_signature_external_parameters(os); 239 os->print(")"); 240 } 241 242 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) { 243 if (log_is_enabled(Debug, exceptions)) { 244 ResourceMark rm(THREAD); 245 log_debug(exceptions)("Looking for catch handler for exception of type \"%s\" in method \"%s\"", 246 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string()); 247 } 248 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 249 // access exception table 250 ExceptionTable table(mh()); 251 int length = table.length(); 252 // iterate through all entries sequentially 253 constantPoolHandle pool(THREAD, mh->constants()); 254 for (int i = 0; i < length; i ++) { 255 //reacquire the table in case a GC happened 256 ExceptionTable table(mh()); 257 int beg_bci = table.start_pc(i); 258 int end_bci = table.end_pc(i); 259 assert(beg_bci <= end_bci, "inconsistent exception table"); 260 log_debug(exceptions)(" - checking exception table entry for BCI %d to %d", 261 beg_bci, end_bci); 262 263 if (beg_bci <= throw_bci && throw_bci < end_bci) { 264 // exception handler bci range covers throw_bci => investigate further 265 log_debug(exceptions)(" - entry covers throw point BCI %d", throw_bci); 266 267 int handler_bci = table.handler_pc(i); 268 int klass_index = table.catch_type_index(i); 269 if (klass_index == 0) { 270 if (log_is_enabled(Info, exceptions)) { 271 ResourceMark rm(THREAD); 272 log_info(exceptions)("Found catch-all handler for exception of type \"%s\" in method \"%s\" at BCI: %d", 273 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci); 274 } 275 return handler_bci; 276 } else if (ex_klass == nullptr) { 277 // Is this even possible? 278 if (log_is_enabled(Info, exceptions)) { 279 ResourceMark rm(THREAD); 280 log_info(exceptions)("null exception class is implicitly caught by handler in method \"%s\" at BCI: %d", 281 mh()->name()->as_C_string(), handler_bci); 282 } 283 return handler_bci; 284 } else { 285 if (log_is_enabled(Debug, exceptions)) { 286 ResourceMark rm(THREAD); 287 log_debug(exceptions)(" - resolving catch type \"%s\"", 288 pool->klass_name_at(klass_index)->as_C_string()); 289 } 290 // we know the exception class => get the constraint class 291 // this may require loading of the constraint class; if verification 292 // fails or some other exception occurs, return handler_bci 293 Klass* k = pool->klass_at(klass_index, THREAD); 294 if (HAS_PENDING_EXCEPTION) { 295 if (log_is_enabled(Debug, exceptions)) { 296 ResourceMark rm(THREAD); 297 log_debug(exceptions)(" - exception \"%s\" occurred resolving catch type", 298 PENDING_EXCEPTION->klass()->external_name()); 299 } 300 return handler_bci; 301 } 302 assert(k != nullptr, "klass not loaded"); 303 if (ex_klass->is_subtype_of(k)) { 304 if (log_is_enabled(Info, exceptions)) { 305 ResourceMark rm(THREAD); 306 log_info(exceptions)("Found matching handler for exception of type \"%s\" in method \"%s\" at BCI: %d", 307 ex_klass == nullptr ? "null" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci); 308 } 309 return handler_bci; 310 } 311 } 312 } 313 } 314 315 if (log_is_enabled(Debug, exceptions)) { 316 ResourceMark rm(THREAD); 317 log_debug(exceptions)("No catch handler found for exception of type \"%s\" in method \"%s\"", 318 ex_klass->external_name(), mh->name()->as_C_string()); 319 } 320 321 return -1; 322 } 323 324 void Method::mask_for(int bci, InterpreterOopMap* mask) { 325 methodHandle h_this(Thread::current(), this); 326 mask_for(h_this, bci, mask); 327 } 328 329 void Method::mask_for(const methodHandle& this_mh, int bci, InterpreterOopMap* mask) { 330 assert(this_mh() == this, "Sanity"); 331 method_holder()->mask_for(this_mh, bci, mask); 332 } 333 334 int Method::bci_from(address bcp) const { 335 if (is_native() && bcp == nullptr) { 336 return 0; 337 } 338 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code 339 // may call this after interrupting a nested ResourceMark. 340 assert((is_native() && bcp == code_base()) || contains(bcp) || VMError::is_error_reported(), 341 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp)); 342 343 return int(bcp - code_base()); 344 } 345 346 347 int Method::validate_bci(int bci) const { 348 return (bci == 0 || bci < code_size()) ? bci : -1; 349 } 350 351 // Return bci if it appears to be a valid bcp 352 // Return -1 otherwise. 353 // Used by profiling code, when invalid data is a possibility. 354 // The caller is responsible for validating the Method* itself. 355 int Method::validate_bci_from_bcp(address bcp) const { 356 // keep bci as -1 if not a valid bci 357 int bci = -1; 358 if (bcp == nullptr || bcp == code_base()) { 359 // code_size() may return 0 and we allow 0 here 360 // the method may be native 361 bci = 0; 362 } else if (contains(bcp)) { 363 bci = int(bcp - code_base()); 364 } 365 // Assert that if we have dodged any asserts, bci is negative. 366 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 367 return bci; 368 } 369 370 address Method::bcp_from(int bci) const { 371 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), 372 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native"); 373 address bcp = code_base() + bci; 374 assert((is_native() && bcp == code_base()) || contains(bcp), "bcp doesn't belong to this method"); 375 return bcp; 376 } 377 378 address Method::bcp_from(address bcp) const { 379 if (is_native() && bcp == nullptr) { 380 return code_base(); 381 } else { 382 return bcp; 383 } 384 } 385 386 int Method::size(bool is_native) { 387 // If native, then include pointers for native_function and signature_handler 388 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 389 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord; 390 return align_metadata_size(header_size() + extra_words); 391 } 392 393 Symbol* Method::klass_name() const { 394 return method_holder()->name(); 395 } 396 397 void Method::metaspace_pointers_do(MetaspaceClosure* it) { 398 log_trace(cds)("Iter(Method): %p", this); 399 400 if (!method_holder()->is_rewritten() || CDSConfig::is_valhalla_preview()) { 401 it->push(&_constMethod, MetaspaceClosure::_writable); 402 } else { 403 it->push(&_constMethod); 404 } 405 it->push(&_method_data); 406 it->push(&_method_counters); 407 NOT_PRODUCT(it->push(&_name);) 408 } 409 410 #if INCLUDE_CDS 411 // Attempt to return method to original state. Clear any pointers 412 // (to objects outside the shared spaces). We won't be able to predict 413 // where they should point in a new JVM. Further initialize some 414 // entries now in order allow them to be write protected later. 415 416 void Method::remove_unshareable_info() { 417 unlink_method(); 418 JFR_ONLY(REMOVE_METHOD_ID(this);) 419 } 420 421 void Method::restore_unshareable_info(TRAPS) { 422 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored"); 423 assert(!queued_for_compilation(), "method's queued_for_compilation flag should not be set"); 424 } 425 #endif 426 427 void Method::set_vtable_index(int index) { 428 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) { 429 // At runtime initialize_vtable is rerun as part of link_class_impl() 430 // for a shared class loaded by the non-boot loader to obtain the loader 431 // constraints based on the runtime classloaders' context. 432 return; // don't write into the shared class 433 } else { 434 _vtable_index = index; 435 } 436 } 437 438 void Method::set_itable_index(int index) { 439 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) { 440 // At runtime initialize_itable is rerun as part of link_class_impl() 441 // for a shared class loaded by the non-boot loader to obtain the loader 442 // constraints based on the runtime classloaders' context. The dumptime 443 // itable index should be the same as the runtime index. 444 assert(_vtable_index == itable_index_max - index, 445 "archived itable index is different from runtime index"); 446 return; // don’t write into the shared class 447 } else { 448 _vtable_index = itable_index_max - index; 449 } 450 assert(valid_itable_index(), ""); 451 } 452 453 // The RegisterNatives call being attempted tried to register with a method that 454 // is not native. Ask JVM TI what prefixes have been specified. Then check 455 // to see if the native method is now wrapped with the prefixes. See the 456 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details. 457 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) { 458 #if INCLUDE_JVMTI 459 ResourceMark rm(THREAD); 460 Method* method; 461 int name_len = name->utf8_length(); 462 char* name_str = name->as_utf8(); 463 int prefix_count; 464 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count); 465 for (int i = 0; i < prefix_count; i++) { 466 char* prefix = prefixes[i]; 467 int prefix_len = (int)strlen(prefix); 468 469 // try adding this prefix to the method name and see if it matches another method name 470 int trial_len = name_len + prefix_len; 471 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1); 472 strcpy(trial_name_str, prefix); 473 strcat(trial_name_str, name_str); 474 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len); 475 if (trial_name == nullptr) { 476 continue; // no such symbol, so this prefix wasn't used, try the next prefix 477 } 478 method = k->lookup_method(trial_name, signature); 479 if (method == nullptr) { 480 continue; // signature doesn't match, try the next prefix 481 } 482 if (method->is_native()) { 483 method->set_is_prefixed_native(); 484 return method; // wahoo, we found a prefixed version of the method, return it 485 } 486 // found as non-native, so prefix is good, add it, probably just need more prefixes 487 name_len = trial_len; 488 name_str = trial_name_str; 489 } 490 #endif // INCLUDE_JVMTI 491 return nullptr; // not found 492 } 493 494 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) { 495 Method* method = k->lookup_method(name, signature); 496 if (method == nullptr) { 497 ResourceMark rm(THREAD); 498 stringStream st; 499 st.print("Method '"); 500 print_external_name(&st, k, name, signature); 501 st.print("' name or signature does not match"); 502 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false); 503 } 504 if (!method->is_native()) { 505 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es) 506 method = find_prefixed_native(k, name, signature, THREAD); 507 if (method == nullptr) { 508 ResourceMark rm(THREAD); 509 stringStream st; 510 st.print("Method '"); 511 print_external_name(&st, k, name, signature); 512 st.print("' is not declared as native"); 513 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false); 514 } 515 } 516 517 if (entry != nullptr) { 518 method->set_native_function(entry, native_bind_event_is_interesting); 519 } else { 520 method->clear_native_function(); 521 } 522 if (log_is_enabled(Debug, jni, resolve)) { 523 ResourceMark rm(THREAD); 524 log_debug(jni, resolve)("[Registering JNI native method %s.%s]", 525 method->method_holder()->external_name(), 526 method->name()->as_C_string()); 527 } 528 return true; 529 } 530 531 bool Method::was_executed_more_than(int n) { 532 // Invocation counter is reset when the Method* is compiled. 533 // If the method has compiled code we therefore assume it has 534 // be executed more than n times. 535 if (is_accessor() || is_empty_method() || (code() != nullptr)) { 536 // interpreter doesn't bump invocation counter of trivial methods 537 // compiler does not bump invocation counter of compiled methods 538 return true; 539 } 540 else if ((method_counters() != nullptr && 541 method_counters()->invocation_counter()->carry()) || 542 (method_data() != nullptr && 543 method_data()->invocation_counter()->carry())) { 544 // The carry bit is set when the counter overflows and causes 545 // a compilation to occur. We don't know how many times 546 // the counter has been reset, so we simply assume it has 547 // been executed more than n times. 548 return true; 549 } else { 550 return invocation_count() > n; 551 } 552 } 553 554 void Method::print_invocation_count(outputStream* st) { 555 //---< compose+print method return type, klass, name, and signature >--- 556 if (is_static()) { st->print("static "); } 557 if (is_final()) { st->print("final "); } 558 if (is_synchronized()) { st->print("synchronized "); } 559 if (is_native()) { st->print("native "); } 560 st->print("%s::", method_holder()->external_name()); 561 name()->print_symbol_on(st); 562 signature()->print_symbol_on(st); 563 564 if (WizardMode) { 565 // dump the size of the byte codes 566 st->print(" {%d}", code_size()); 567 } 568 st->cr(); 569 570 // Counting based on signed int counters tends to overflow with 571 // longer-running workloads on fast machines. The counters under 572 // consideration here, however, are limited in range by counting 573 // logic. See InvocationCounter:count_limit for example. 574 // No "overflow precautions" need to be implemented here. 575 st->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count()); 576 st->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count()); 577 st->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count()); 578 579 if (method_data() != nullptr) { 580 st->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count()); 581 } 582 583 #ifndef PRODUCT 584 if (CountCompiledCalls) { 585 st->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count()); 586 } 587 #endif 588 } 589 590 // Build a MethodData* object to hold profiling information collected on this 591 // method when requested. 592 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) { 593 // Do not profile the method if metaspace has hit an OOM previously 594 // allocating profiling data. Callers clear pending exception so don't 595 // add one here. 596 if (ClassLoaderDataGraph::has_metaspace_oom()) { 597 return; 598 } 599 600 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 601 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 602 if (HAS_PENDING_EXCEPTION) { 603 CompileBroker::log_metaspace_failure(); 604 ClassLoaderDataGraph::set_metaspace_oom(true); 605 return; // return the exception (which is cleared) 606 } 607 608 if (!Atomic::replace_if_null(&method->_method_data, method_data)) { 609 MetadataFactory::free_metadata(loader_data, method_data); 610 return; 611 } 612 613 if (PrintMethodData && (Verbose || WizardMode)) { 614 ResourceMark rm(THREAD); 615 tty->print("build_profiling_method_data for "); 616 method->print_name(tty); 617 tty->cr(); 618 // At the end of the run, the MDO, full of data, will be dumped. 619 } 620 } 621 622 MethodCounters* Method::build_method_counters(Thread* current, Method* m) { 623 // Do not profile the method if metaspace has hit an OOM previously 624 if (ClassLoaderDataGraph::has_metaspace_oom()) { 625 return nullptr; 626 } 627 628 methodHandle mh(current, m); 629 MethodCounters* counters; 630 if (current->is_Java_thread()) { 631 JavaThread* THREAD = JavaThread::cast(current); // For exception macros. 632 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold 633 // if needed. 634 counters = MethodCounters::allocate_with_exception(mh, THREAD); 635 if (HAS_PENDING_EXCEPTION) { 636 CLEAR_PENDING_EXCEPTION; 637 } 638 } else { 639 // Call metaspace allocation that doesn't throw exception if the 640 // current thread isn't a JavaThread, ie. the VMThread. 641 counters = MethodCounters::allocate_no_exception(mh); 642 } 643 644 if (counters == nullptr) { 645 CompileBroker::log_metaspace_failure(); 646 ClassLoaderDataGraph::set_metaspace_oom(true); 647 return nullptr; 648 } 649 650 if (!mh->init_method_counters(counters)) { 651 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 652 } 653 654 return mh->method_counters(); 655 } 656 657 bool Method::init_method_counters(MethodCounters* counters) { 658 // Try to install a pointer to MethodCounters, return true on success. 659 return Atomic::replace_if_null(&_method_counters, counters); 660 } 661 662 void Method::set_exception_handler_entered(int handler_bci) { 663 if (ProfileExceptionHandlers) { 664 MethodData* mdo = method_data(); 665 if (mdo != nullptr) { 666 BitData handler_data = mdo->exception_handler_bci_to_data(handler_bci); 667 handler_data.set_exception_handler_entered(); 668 } 669 } 670 } 671 672 int Method::extra_stack_words() { 673 // not an inline function, to avoid a header dependency on Interpreter 674 return extra_stack_entries() * Interpreter::stackElementSize; 675 } 676 677 // InlineKlass the method is declared to return. This must not 678 // safepoint as it is called with references live on the stack at 679 // locations the GC is unaware of. 680 InlineKlass* Method::returns_inline_type(Thread* thread) const { 681 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields"); 682 if (is_native()) { 683 return nullptr; 684 } 685 NoSafepointVerifier nsv; 686 SignatureStream ss(signature()); 687 while (!ss.at_return_type()) { 688 ss.next(); 689 } 690 return ss.as_inline_klass(method_holder()); 691 } 692 693 bool Method::compute_has_loops_flag() { 694 BytecodeStream bcs(methodHandle(Thread::current(), this)); 695 Bytecodes::Code bc; 696 697 while ((bc = bcs.next()) >= 0) { 698 switch (bc) { 699 case Bytecodes::_ifeq: 700 case Bytecodes::_ifnull: 701 case Bytecodes::_iflt: 702 case Bytecodes::_ifle: 703 case Bytecodes::_ifne: 704 case Bytecodes::_ifnonnull: 705 case Bytecodes::_ifgt: 706 case Bytecodes::_ifge: 707 case Bytecodes::_if_icmpeq: 708 case Bytecodes::_if_icmpne: 709 case Bytecodes::_if_icmplt: 710 case Bytecodes::_if_icmpgt: 711 case Bytecodes::_if_icmple: 712 case Bytecodes::_if_icmpge: 713 case Bytecodes::_if_acmpeq: 714 case Bytecodes::_if_acmpne: 715 case Bytecodes::_goto: 716 case Bytecodes::_jsr: 717 if (bcs.dest() < bcs.next_bci()) { 718 return set_has_loops(); 719 } 720 break; 721 722 case Bytecodes::_goto_w: 723 case Bytecodes::_jsr_w: 724 if (bcs.dest_w() < bcs.next_bci()) { 725 return set_has_loops(); 726 } 727 break; 728 729 case Bytecodes::_lookupswitch: { 730 Bytecode_lookupswitch lookupswitch(this, bcs.bcp()); 731 if (lookupswitch.default_offset() < 0) { 732 return set_has_loops(); 733 } else { 734 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) { 735 LookupswitchPair pair = lookupswitch.pair_at(i); 736 if (pair.offset() < 0) { 737 return set_has_loops(); 738 } 739 } 740 } 741 break; 742 } 743 case Bytecodes::_tableswitch: { 744 Bytecode_tableswitch tableswitch(this, bcs.bcp()); 745 if (tableswitch.default_offset() < 0) { 746 return set_has_loops(); 747 } else { 748 for (int i = 0; i < tableswitch.length(); ++i) { 749 if (tableswitch.dest_offset_at(i) < 0) { 750 return set_has_loops(); 751 } 752 } 753 } 754 break; 755 } 756 default: 757 break; 758 } 759 } 760 761 _flags.set_has_loops_flag_init(true); 762 return false; 763 } 764 765 bool Method::is_final_method(AccessFlags class_access_flags) const { 766 // or "does_not_require_vtable_entry" 767 // default method or overpass can occur, is not final (reuses vtable entry) 768 // private methods in classes get vtable entries for backward class compatibility. 769 if (is_overpass() || is_default_method()) return false; 770 return is_final() || class_access_flags.is_final(); 771 } 772 773 bool Method::is_final_method() const { 774 return is_final_method(method_holder()->access_flags()); 775 } 776 777 bool Method::is_default_method() const { 778 if (method_holder() != nullptr && 779 method_holder()->is_interface() && 780 !is_abstract() && !is_private()) { 781 return true; 782 } else { 783 return false; 784 } 785 } 786 787 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 788 if (is_final_method(class_access_flags)) return true; 789 #ifdef ASSERT 790 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 791 if (class_access_flags.is_interface()) { 792 ResourceMark rm; 793 assert(is_nonv == is_static() || is_nonv == is_private(), 794 "nonvirtual unexpected for non-static, non-private: %s", 795 name_and_sig_as_C_string()); 796 } 797 #endif 798 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 799 return vtable_index() == nonvirtual_vtable_index; 800 } 801 802 bool Method::can_be_statically_bound() const { 803 return can_be_statically_bound(method_holder()->access_flags()); 804 } 805 806 bool Method::can_be_statically_bound(InstanceKlass* context) const { 807 return (method_holder() == context) && can_be_statically_bound(); 808 } 809 810 /** 811 * Returns false if this is one of specially treated methods for 812 * which we have to provide stack trace in throw in compiled code. 813 * Returns true otherwise. 814 */ 815 bool Method::can_omit_stack_trace() { 816 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) { 817 return false; // All methods in sun.invoke.util.ValueConversions 818 } 819 return true; 820 } 821 822 bool Method::is_accessor() const { 823 return is_getter() || is_setter(); 824 } 825 826 bool Method::is_getter() const { 827 if (code_size() != 5) return false; 828 if (size_of_parameters() != 1) return false; 829 if (java_code_at(0) != Bytecodes::_aload_0) return false; 830 if (java_code_at(1) != Bytecodes::_getfield) return false; 831 switch (java_code_at(4)) { 832 case Bytecodes::_ireturn: 833 case Bytecodes::_lreturn: 834 case Bytecodes::_freturn: 835 case Bytecodes::_dreturn: 836 case Bytecodes::_areturn: 837 break; 838 default: 839 return false; 840 } 841 if (has_scalarized_return()) { 842 // Don't treat this as (trivial) getter method because the 843 // inline type should be returned in a scalarized form. 844 return false; 845 } 846 return true; 847 } 848 849 bool Method::is_setter() const { 850 if (code_size() != 6) return false; 851 if (java_code_at(0) != Bytecodes::_aload_0) return false; 852 switch (java_code_at(1)) { 853 case Bytecodes::_iload_1: 854 case Bytecodes::_aload_1: 855 case Bytecodes::_fload_1: 856 if (size_of_parameters() != 2) return false; 857 break; 858 case Bytecodes::_dload_1: 859 case Bytecodes::_lload_1: 860 if (size_of_parameters() != 3) return false; 861 break; 862 default: 863 return false; 864 } 865 if (java_code_at(2) != Bytecodes::_putfield) return false; 866 if (java_code_at(5) != Bytecodes::_return) return false; 867 if (has_scalarized_args()) { 868 // Don't treat this as (trivial) setter method because the 869 // inline type argument should be passed in a scalarized form. 870 return false; 871 } 872 return true; 873 } 874 875 bool Method::is_constant_getter() const { 876 int last_index = code_size() - 1; 877 // Check if the first 1-3 bytecodes are a constant push 878 // and the last bytecode is a return. 879 return (2 <= code_size() && code_size() <= 4 && 880 Bytecodes::is_const(java_code_at(0)) && 881 Bytecodes::length_for(java_code_at(0)) == last_index && 882 Bytecodes::is_return(java_code_at(last_index)) && 883 !has_scalarized_args()); 884 } 885 886 bool Method::is_class_initializer() const { 887 // For classfiles version 51 or greater, ensure that the clinit method is 888 // static. Non-static methods with the name "<clinit>" are not static 889 // initializers. (older classfiles exempted for backward compatibility) 890 return (name() == vmSymbols::class_initializer_name() && 891 (is_static() || 892 method_holder()->major_version() < 51)); 893 } 894 895 // A method named <init>, is a classic object constructor. 896 bool Method::is_object_constructor() const { 897 return name() == vmSymbols::object_initializer_name(); 898 } 899 900 bool Method::needs_clinit_barrier() const { 901 return is_static() && !method_holder()->is_initialized(); 902 } 903 904 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 905 int length = method->checked_exceptions_length(); 906 if (length == 0) { // common case 907 return objArrayHandle(THREAD, Universe::the_empty_class_array()); 908 } else { 909 methodHandle h_this(THREAD, method); 910 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle())); 911 objArrayHandle mirrors (THREAD, m_oop); 912 for (int i = 0; i < length; i++) { 913 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 914 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 915 if (log_is_enabled(Warning, exceptions) && 916 !k->is_subclass_of(vmClasses::Throwable_klass())) { 917 ResourceMark rm(THREAD); 918 log_warning(exceptions)( 919 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable", 920 k->external_name(), method->external_name()); 921 } 922 mirrors->obj_at_put(i, k->java_mirror()); 923 } 924 return mirrors; 925 } 926 }; 927 928 929 int Method::line_number_from_bci(int bci) const { 930 int best_bci = 0; 931 int best_line = -1; 932 if (bci == SynchronizationEntryBCI) bci = 0; 933 if (0 <= bci && bci < code_size() && has_linenumber_table()) { 934 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 935 // Not necessarily sorted and not necessarily one-to-one. 936 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 937 while (stream.read_pair()) { 938 if (stream.bci() == bci) { 939 // perfect match 940 return stream.line(); 941 } else { 942 // update best_bci/line 943 if (stream.bci() < bci && stream.bci() >= best_bci) { 944 best_bci = stream.bci(); 945 best_line = stream.line(); 946 } 947 } 948 } 949 } 950 return best_line; 951 } 952 953 954 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 955 if( constants()->tag_at(klass_index).is_unresolved_klass()) { 956 Thread *thread = Thread::current(); 957 Symbol* klass_name = constants()->klass_name_at(klass_index); 958 Handle loader(thread, method_holder()->class_loader()); 959 Handle prot (thread, method_holder()->protection_domain()); 960 return SystemDictionary::find_instance_klass(thread, klass_name, loader, prot) != nullptr; 961 } else { 962 return true; 963 } 964 } 965 966 967 bool Method::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const { 968 int klass_index = constants()->klass_ref_index_at(refinfo_index, bc); 969 if (must_be_resolved) { 970 // Make sure klass is resolved in constantpool. 971 if (constants()->tag_at(klass_index).is_unresolved_klass()) { 972 return false; 973 } 974 } 975 return is_klass_loaded_by_klass_index(klass_index); 976 } 977 978 979 void Method::set_native_function(address function, bool post_event_flag) { 980 assert(function != nullptr, "use clear_native_function to unregister natives"); 981 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 982 address* native_function = native_function_addr(); 983 984 // We can see racers trying to place the same native function into place. Once 985 // is plenty. 986 address current = *native_function; 987 if (current == function) return; 988 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 989 function != nullptr) { 990 // native_method_throw_unsatisfied_link_error_entry() should only 991 // be passed when post_event_flag is false. 992 assert(function != 993 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 994 "post_event_flag mismatch"); 995 996 // post the bind event, and possible change the bind function 997 JvmtiExport::post_native_method_bind(this, &function); 998 } 999 *native_function = function; 1000 // This function can be called more than once. We must make sure that we always 1001 // use the latest registered method -> check if a stub already has been generated. 1002 // If so, we have to make it not_entrant. 1003 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 1004 if (nm != nullptr) { 1005 nm->make_not_entrant(); 1006 } 1007 } 1008 1009 1010 bool Method::has_native_function() const { 1011 if (is_special_native_intrinsic()) 1012 return false; // special-cased in SharedRuntime::generate_native_wrapper 1013 address func = native_function(); 1014 return (func != nullptr && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 1015 } 1016 1017 1018 void Method::clear_native_function() { 1019 // Note: is_method_handle_intrinsic() is allowed here. 1020 set_native_function( 1021 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1022 !native_bind_event_is_interesting); 1023 this->unlink_code(); 1024 } 1025 1026 1027 void Method::set_signature_handler(address handler) { 1028 address* signature_handler = signature_handler_addr(); 1029 *signature_handler = handler; 1030 } 1031 1032 1033 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 1034 assert(reason != nullptr, "must provide a reason"); 1035 if (PrintCompilation && report) { 1036 ttyLocker ttyl; 1037 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 1038 if (comp_level == CompLevel_all) { 1039 tty->print("all levels "); 1040 } else { 1041 tty->print("level %d ", comp_level); 1042 } 1043 this->print_short_name(tty); 1044 int size = this->code_size(); 1045 if (size > 0) { 1046 tty->print(" (%d bytes)", size); 1047 } 1048 if (reason != nullptr) { 1049 tty->print(" %s", reason); 1050 } 1051 tty->cr(); 1052 } 1053 if ((TraceDeoptimization || LogCompilation) && (xtty != nullptr)) { 1054 ttyLocker ttyl; 1055 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 1056 os::current_thread_id(), is_osr, comp_level); 1057 if (reason != nullptr) { 1058 xtty->print(" reason=\'%s\'", reason); 1059 } 1060 xtty->method(this); 1061 xtty->stamp(); 1062 xtty->end_elem(); 1063 } 1064 } 1065 1066 bool Method::is_always_compilable() const { 1067 // Generated adapters must be compiled 1068 if (is_special_native_intrinsic() && is_synthetic()) { 1069 assert(!is_not_c1_compilable(), "sanity check"); 1070 assert(!is_not_c2_compilable(), "sanity check"); 1071 return true; 1072 } 1073 1074 return false; 1075 } 1076 1077 bool Method::is_not_compilable(int comp_level) const { 1078 if (number_of_breakpoints() > 0) 1079 return true; 1080 if (is_always_compilable()) 1081 return false; 1082 if (comp_level == CompLevel_any) 1083 return is_not_c1_compilable() && is_not_c2_compilable(); 1084 if (is_c1_compile(comp_level)) 1085 return is_not_c1_compilable(); 1086 if (is_c2_compile(comp_level)) 1087 return is_not_c2_compilable(); 1088 return false; 1089 } 1090 1091 // call this when compiler finds that this method is not compilable 1092 void Method::set_not_compilable(const char* reason, int comp_level, bool report) { 1093 if (is_always_compilable()) { 1094 // Don't mark a method which should be always compilable 1095 return; 1096 } 1097 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 1098 if (comp_level == CompLevel_all) { 1099 set_is_not_c1_compilable(); 1100 set_is_not_c2_compilable(); 1101 } else { 1102 if (is_c1_compile(comp_level)) 1103 set_is_not_c1_compilable(); 1104 if (is_c2_compile(comp_level)) 1105 set_is_not_c2_compilable(); 1106 } 1107 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check"); 1108 } 1109 1110 bool Method::is_not_osr_compilable(int comp_level) const { 1111 if (is_not_compilable(comp_level)) 1112 return true; 1113 if (comp_level == CompLevel_any) 1114 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable(); 1115 if (is_c1_compile(comp_level)) 1116 return is_not_c1_osr_compilable(); 1117 if (is_c2_compile(comp_level)) 1118 return is_not_c2_osr_compilable(); 1119 return false; 1120 } 1121 1122 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) { 1123 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 1124 if (comp_level == CompLevel_all) { 1125 set_is_not_c1_osr_compilable(); 1126 set_is_not_c2_osr_compilable(); 1127 } else { 1128 if (is_c1_compile(comp_level)) 1129 set_is_not_c1_osr_compilable(); 1130 if (is_c2_compile(comp_level)) 1131 set_is_not_c2_osr_compilable(); 1132 } 1133 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check"); 1134 } 1135 1136 // Revert to using the interpreter and clear out the nmethod 1137 void Method::clear_code() { 1138 // this may be null if c2i adapters have not been made yet 1139 // Only should happen at allocate time. 1140 if (adapter() == nullptr) { 1141 _from_compiled_entry = nullptr; 1142 _from_compiled_inline_entry = nullptr; 1143 _from_compiled_inline_ro_entry = nullptr; 1144 } else { 1145 _from_compiled_entry = adapter()->get_c2i_entry(); 1146 _from_compiled_inline_entry = adapter()->get_c2i_inline_entry(); 1147 _from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry(); 1148 } 1149 OrderAccess::storestore(); 1150 _from_interpreted_entry = _i2i_entry; 1151 OrderAccess::storestore(); 1152 _code = nullptr; 1153 } 1154 1155 void Method::unlink_code(nmethod *compare) { 1156 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag); 1157 // We need to check if either the _code or _from_compiled_code_entry_point 1158 // refer to this nmethod because there is a race in setting these two fields 1159 // in Method* as seen in bugid 4947125. 1160 if (code() == compare || 1161 from_compiled_entry() == compare->verified_entry_point()) { 1162 clear_code(); 1163 } 1164 } 1165 1166 void Method::unlink_code() { 1167 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag); 1168 clear_code(); 1169 } 1170 1171 #if INCLUDE_CDS 1172 // Called by class data sharing to remove any entry points (which are not shared) 1173 void Method::unlink_method() { 1174 assert(CDSConfig::is_dumping_archive(), "sanity"); 1175 _code = nullptr; 1176 _adapter = nullptr; 1177 _i2i_entry = nullptr; 1178 _from_compiled_entry = nullptr; 1179 _from_compiled_inline_entry = nullptr; 1180 _from_compiled_inline_ro_entry = nullptr; 1181 _from_interpreted_entry = nullptr; 1182 1183 if (is_native()) { 1184 *native_function_addr() = nullptr; 1185 set_signature_handler(nullptr); 1186 } 1187 NOT_PRODUCT(set_compiled_invocation_count(0);) 1188 1189 clear_method_data(); 1190 clear_method_counters(); 1191 remove_unshareable_flags(); 1192 } 1193 1194 void Method::remove_unshareable_flags() { 1195 // clear all the flags that shouldn't be in the archived version 1196 assert(!is_old(), "must be"); 1197 assert(!is_obsolete(), "must be"); 1198 assert(!is_deleted(), "must be"); 1199 1200 set_is_prefixed_native(false); 1201 set_queued_for_compilation(false); 1202 set_is_not_c2_compilable(false); 1203 set_is_not_c1_compilable(false); 1204 set_is_not_c2_osr_compilable(false); 1205 set_on_stack_flag(false); 1206 set_has_scalarized_args(false); 1207 set_has_scalarized_return(false); 1208 } 1209 #endif 1210 1211 // Called when the method_holder is getting linked. Setup entrypoints so the method 1212 // is ready to be called from interpreter, compiler, and vtables. 1213 void Method::link_method(const methodHandle& h_method, TRAPS) { 1214 if (log_is_enabled(Info, perf, class, link)) { 1215 ClassLoader::perf_ik_link_methods_count()->inc(); 1216 } 1217 1218 // If the code cache is full, we may reenter this function for the 1219 // leftover methods that weren't linked. 1220 if (adapter() != nullptr) { 1221 return; 1222 } 1223 assert( _code == nullptr, "nothing compiled yet" ); 1224 1225 // Setup interpreter entrypoint 1226 assert(this == h_method(), "wrong h_method()" ); 1227 1228 assert(adapter() == nullptr, "init'd to null"); 1229 address entry = Interpreter::entry_for_method(h_method); 1230 assert(entry != nullptr, "interpreter entry must be non-null"); 1231 // Sets both _i2i_entry and _from_interpreted_entry 1232 set_interpreter_entry(entry); 1233 1234 // Don't overwrite already registered native entries. 1235 if (is_native() && !has_native_function()) { 1236 set_native_function( 1237 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1238 !native_bind_event_is_interesting); 1239 } 1240 if (InlineTypeReturnedAsFields && returns_inline_type(THREAD) && !has_scalarized_return()) { 1241 set_has_scalarized_return(); 1242 } 1243 1244 // Setup compiler entrypoint. This is made eagerly, so we do not need 1245 // special handling of vtables. An alternative is to make adapters more 1246 // lazily by calling make_adapter() from from_compiled_entry() for the 1247 // normal calls. For vtable calls life gets more complicated. When a 1248 // call-site goes mega-morphic we need adapters in all methods which can be 1249 // called from the vtable. We need adapters on such methods that get loaded 1250 // later. Ditto for mega-morphic itable calls. If this proves to be a 1251 // problem we'll make these lazily later. 1252 (void) make_adapters(h_method, CHECK); 1253 1254 // ONLY USE the h_method now as make_adapter may have blocked 1255 1256 if (h_method->is_continuation_native_intrinsic()) { 1257 _from_interpreted_entry = nullptr; 1258 _from_compiled_entry = nullptr; 1259 _i2i_entry = nullptr; 1260 if (Continuations::enabled()) { 1261 assert(!Threads::is_vm_complete(), "should only be called during vm init"); 1262 AdapterHandlerLibrary::create_native_wrapper(h_method); 1263 if (!h_method->has_compiled_code()) { 1264 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Initial size of CodeCache is too small"); 1265 } 1266 assert(_from_interpreted_entry == get_i2c_entry(), "invariant"); 1267 } 1268 } 1269 } 1270 1271 address Method::make_adapters(const methodHandle& mh, TRAPS) { 1272 PerfTraceTime timer(ClassLoader::perf_method_adapters_time()); 1273 1274 // Adapters for compiled code are made eagerly here. They are fairly 1275 // small (generally < 100 bytes) and quick to make (and cached and shared) 1276 // so making them eagerly shouldn't be too expensive. 1277 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1278 if (adapter == nullptr ) { 1279 if (!is_init_completed()) { 1280 // Don't throw exceptions during VM initialization because java.lang.* classes 1281 // might not have been initialized, causing problems when constructing the 1282 // Java exception object. 1283 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1284 } else { 1285 THROW_MSG_NULL(vmSymbols::java_lang_OutOfMemoryError(), "Out of space in CodeCache for adapters"); 1286 } 1287 } 1288 1289 mh->set_adapter_entry(adapter); 1290 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1291 mh->_from_compiled_inline_entry = adapter->get_c2i_inline_entry(); 1292 mh->_from_compiled_inline_ro_entry = adapter->get_c2i_inline_ro_entry(); 1293 return adapter->get_c2i_entry(); 1294 } 1295 1296 // The verified_code_entry() must be called when a invoke is resolved 1297 // on this method. 1298 1299 // It returns the compiled code entry point, after asserting not null. 1300 // This function is called after potential safepoints so that nmethod 1301 // or adapter that it points to is still live and valid. 1302 // This function must not hit a safepoint! 1303 address Method::verified_code_entry() { 1304 debug_only(NoSafepointVerifier nsv;) 1305 assert(_from_compiled_entry != nullptr, "must be set"); 1306 return _from_compiled_entry; 1307 } 1308 1309 address Method::verified_inline_code_entry() { 1310 debug_only(NoSafepointVerifier nsv;) 1311 assert(_from_compiled_inline_entry != nullptr, "must be set"); 1312 return _from_compiled_inline_entry; 1313 } 1314 1315 address Method::verified_inline_ro_code_entry() { 1316 debug_only(NoSafepointVerifier nsv;) 1317 assert(_from_compiled_inline_ro_entry != nullptr, "must be set"); 1318 return _from_compiled_inline_ro_entry; 1319 } 1320 1321 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1322 // (could be racing a deopt). 1323 // Not inline to avoid circular ref. 1324 bool Method::check_code() const { 1325 // cached in a register or local. There's a race on the value of the field. 1326 nmethod *code = Atomic::load_acquire(&_code); 1327 return code == nullptr || (code->method() == nullptr) || (code->method() == (Method*)this && !code->is_osr_method()); 1328 } 1329 1330 // Install compiled code. Instantly it can execute. 1331 void Method::set_code(const methodHandle& mh, nmethod *code) { 1332 assert_lock_strong(NMethodState_lock); 1333 assert( code, "use clear_code to remove code" ); 1334 assert( mh->check_code(), "" ); 1335 1336 guarantee(mh->adapter() != nullptr, "Adapter blob must already exist!"); 1337 1338 // These writes must happen in this order, because the interpreter will 1339 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1340 // which jumps to _from_compiled_entry. 1341 mh->_code = code; // Assign before allowing compiled code to exec 1342 1343 int comp_level = code->comp_level(); 1344 // In theory there could be a race here. In practice it is unlikely 1345 // and not worth worrying about. 1346 if (comp_level > mh->highest_comp_level()) { 1347 mh->set_highest_comp_level(comp_level); 1348 } 1349 1350 OrderAccess::storestore(); 1351 mh->_from_compiled_entry = code->verified_entry_point(); 1352 mh->_from_compiled_inline_entry = code->verified_inline_entry_point(); 1353 mh->_from_compiled_inline_ro_entry = code->verified_inline_ro_entry_point(); 1354 OrderAccess::storestore(); 1355 1356 if (mh->is_continuation_native_intrinsic()) { 1357 assert(mh->_from_interpreted_entry == nullptr, "initialized incorrectly"); // see link_method 1358 1359 if (mh->is_continuation_enter_intrinsic()) { 1360 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted 1361 mh->_i2i_entry = ContinuationEntry::interpreted_entry(); 1362 } else if (mh->is_continuation_yield_intrinsic()) { 1363 mh->_i2i_entry = mh->get_i2c_entry(); 1364 } else { 1365 guarantee(false, "Unknown Continuation native intrinsic"); 1366 } 1367 // This must come last, as it is what's tested in LinkResolver::resolve_static_call 1368 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry()); 1369 } else if (!mh->is_method_handle_intrinsic()) { 1370 // Instantly compiled code can execute. 1371 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1372 } 1373 } 1374 1375 1376 bool Method::is_overridden_in(Klass* k) const { 1377 InstanceKlass* ik = InstanceKlass::cast(k); 1378 1379 if (ik->is_interface()) return false; 1380 1381 // If method is an interface, we skip it - except if it 1382 // is a miranda method 1383 if (method_holder()->is_interface()) { 1384 // Check that method is not a miranda method 1385 if (ik->lookup_method(name(), signature()) == nullptr) { 1386 // No implementation exist - so miranda method 1387 return false; 1388 } 1389 return true; 1390 } 1391 1392 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1393 if (!has_vtable_index()) { 1394 return false; 1395 } else { 1396 Method* vt_m = ik->method_at_vtable(vtable_index()); 1397 return vt_m != this; 1398 } 1399 } 1400 1401 1402 // give advice about whether this Method* should be cached or not 1403 bool Method::should_not_be_cached() const { 1404 if (is_old()) { 1405 // This method has been redefined. It is either EMCP or obsolete 1406 // and we don't want to cache it because that would pin the method 1407 // down and prevent it from being collectible if and when it 1408 // finishes executing. 1409 return true; 1410 } 1411 1412 // caching this method should be just fine 1413 return false; 1414 } 1415 1416 1417 /** 1418 * Returns true if this is one of the specially treated methods for 1419 * security related stack walks (like Reflection.getCallerClass). 1420 */ 1421 bool Method::is_ignored_by_security_stack_walk() const { 1422 if (intrinsic_id() == vmIntrinsics::_invoke) { 1423 // This is Method.invoke() -- ignore it 1424 return true; 1425 } 1426 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) { 1427 // This is an auxiliary frame -- ignore it 1428 return true; 1429 } 1430 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1431 // This is an internal adapter frame for method handles -- ignore it 1432 return true; 1433 } 1434 return false; 1435 } 1436 1437 1438 // Constant pool structure for invoke methods: 1439 enum { 1440 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1441 _imcp_invoke_signature, // utf8: (variable Symbol*) 1442 _imcp_limit 1443 }; 1444 1445 // Test if this method is an MH adapter frame generated by Java code. 1446 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1447 bool Method::is_compiled_lambda_form() const { 1448 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1449 } 1450 1451 // Test if this method is an internal MH primitive method. 1452 bool Method::is_method_handle_intrinsic() const { 1453 vmIntrinsics::ID iid = intrinsic_id(); 1454 return (MethodHandles::is_signature_polymorphic(iid) && 1455 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1456 } 1457 1458 bool Method::has_member_arg() const { 1459 vmIntrinsics::ID iid = intrinsic_id(); 1460 return (MethodHandles::is_signature_polymorphic(iid) && 1461 MethodHandles::has_member_arg(iid)); 1462 } 1463 1464 // Make an instance of a signature-polymorphic internal MH primitive. 1465 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1466 Symbol* signature, 1467 TRAPS) { 1468 ResourceMark rm(THREAD); 1469 methodHandle empty; 1470 1471 InstanceKlass* holder = vmClasses::MethodHandle_klass(); 1472 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1473 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1474 1475 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1476 1477 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1478 name->increment_refcount(); 1479 signature->increment_refcount(); 1480 1481 int cp_length = _imcp_limit; 1482 ClassLoaderData* loader_data = holder->class_loader_data(); 1483 constantPoolHandle cp; 1484 { 1485 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1486 cp = constantPoolHandle(THREAD, cp_oop); 1487 } 1488 cp->copy_fields(holder->constants()); 1489 cp->set_pool_holder(holder); 1490 cp->symbol_at_put(_imcp_invoke_name, name); 1491 cp->symbol_at_put(_imcp_invoke_signature, signature); 1492 cp->set_has_preresolution(); 1493 1494 // decide on access bits: public or not? 1495 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1496 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1497 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1498 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1499 1500 methodHandle m; 1501 { 1502 InlineTableSizes sizes; 1503 Method* m_oop = Method::allocate(loader_data, 0, 1504 accessFlags_from(flags_bits), &sizes, 1505 ConstMethod::NORMAL, 1506 name, 1507 CHECK_(empty)); 1508 m = methodHandle(THREAD, m_oop); 1509 } 1510 m->set_constants(cp()); 1511 m->set_name_index(_imcp_invoke_name); 1512 m->set_signature_index(_imcp_invoke_signature); 1513 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1514 assert(m->signature() == signature, ""); 1515 m->constMethod()->compute_from_signature(signature, must_be_static); 1516 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder())); 1517 assert(m->is_method_handle_intrinsic(), ""); 1518 #ifdef ASSERT 1519 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1520 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1521 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1522 #endif //ASSERT 1523 1524 // Finally, set up its entry points. 1525 assert(m->can_be_statically_bound(), ""); 1526 m->set_vtable_index(Method::nonvirtual_vtable_index); 1527 m->link_method(m, CHECK_(empty)); 1528 1529 if (iid == vmIntrinsics::_linkToNative) { 1530 m->set_interpreter_entry(m->adapter()->get_i2c_entry()); 1531 } 1532 if (log_is_enabled(Debug, methodhandles)) { 1533 LogTarget(Debug, methodhandles) lt; 1534 LogStream ls(lt); 1535 m->print_on(&ls); 1536 } 1537 1538 return m; 1539 } 1540 1541 Klass* Method::check_non_bcp_klass(Klass* klass) { 1542 if (klass != nullptr && klass->class_loader() != nullptr) { 1543 if (klass->is_objArray_klass()) 1544 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1545 return klass; 1546 } 1547 return nullptr; 1548 } 1549 1550 1551 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, 1552 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1553 // Code below does not work for native methods - they should never get rewritten anyway 1554 assert(!m->is_native(), "cannot rewrite native methods"); 1555 // Allocate new Method* 1556 AccessFlags flags = m->access_flags(); 1557 1558 ConstMethod* cm = m->constMethod(); 1559 int checked_exceptions_len = cm->checked_exceptions_length(); 1560 int localvariable_len = cm->localvariable_table_length(); 1561 int exception_table_len = cm->exception_table_length(); 1562 int method_parameters_len = cm->method_parameters_length(); 1563 int method_annotations_len = cm->method_annotations_length(); 1564 int parameter_annotations_len = cm->parameter_annotations_length(); 1565 int type_annotations_len = cm->type_annotations_length(); 1566 int default_annotations_len = cm->default_annotations_length(); 1567 1568 InlineTableSizes sizes( 1569 localvariable_len, 1570 new_compressed_linenumber_size, 1571 exception_table_len, 1572 checked_exceptions_len, 1573 method_parameters_len, 1574 cm->generic_signature_index(), 1575 method_annotations_len, 1576 parameter_annotations_len, 1577 type_annotations_len, 1578 default_annotations_len, 1579 0); 1580 1581 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1582 Method* newm_oop = Method::allocate(loader_data, 1583 new_code_length, 1584 flags, 1585 &sizes, 1586 m->method_type(), 1587 m->name(), 1588 CHECK_(methodHandle())); 1589 methodHandle newm (THREAD, newm_oop); 1590 1591 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1592 ConstMethod* newcm = newm->constMethod(); 1593 int new_const_method_size = newm->constMethod()->size(); 1594 1595 // This works because the source and target are both Methods. Some compilers 1596 // (e.g., clang) complain that the target vtable pointer will be stomped, 1597 // so cast away newm()'s and m()'s Methodness. 1598 memcpy((void*)newm(), (void*)m(), sizeof(Method)); 1599 1600 // Create shallow copy of ConstMethod. 1601 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1602 1603 // Reset correct method/const method, method size, and parameter info 1604 newm->set_constMethod(newcm); 1605 newm->constMethod()->set_code_size(new_code_length); 1606 newm->constMethod()->set_constMethod_size(new_const_method_size); 1607 assert(newm->code_size() == new_code_length, "check"); 1608 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1609 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1610 assert(newm->exception_table_length() == exception_table_len, "check"); 1611 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1612 // Copy new byte codes 1613 memcpy(newm->code_base(), new_code, new_code_length); 1614 // Copy line number table 1615 if (new_compressed_linenumber_size > 0) { 1616 memcpy(newm->compressed_linenumber_table(), 1617 new_compressed_linenumber_table, 1618 new_compressed_linenumber_size); 1619 } 1620 // Copy method_parameters 1621 if (method_parameters_len > 0) { 1622 memcpy(newm->method_parameters_start(), 1623 m->method_parameters_start(), 1624 method_parameters_len * sizeof(MethodParametersElement)); 1625 } 1626 // Copy checked_exceptions 1627 if (checked_exceptions_len > 0) { 1628 memcpy(newm->checked_exceptions_start(), 1629 m->checked_exceptions_start(), 1630 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1631 } 1632 // Copy exception table 1633 if (exception_table_len > 0) { 1634 memcpy(newm->exception_table_start(), 1635 m->exception_table_start(), 1636 exception_table_len * sizeof(ExceptionTableElement)); 1637 } 1638 // Copy local variable number table 1639 if (localvariable_len > 0) { 1640 memcpy(newm->localvariable_table_start(), 1641 m->localvariable_table_start(), 1642 localvariable_len * sizeof(LocalVariableTableElement)); 1643 } 1644 // Copy stackmap table 1645 if (m->has_stackmap_table()) { 1646 int code_attribute_length = m->stackmap_data()->length(); 1647 Array<u1>* stackmap_data = 1648 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle())); 1649 memcpy((void*)stackmap_data->adr_at(0), 1650 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1651 newm->set_stackmap_data(stackmap_data); 1652 } 1653 1654 // copy annotations over to new method 1655 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle())); 1656 return newm; 1657 } 1658 1659 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) { 1660 // if loader is not the default loader (i.e., non-null), we can't know the intrinsics 1661 // because we are not loading from core libraries 1662 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1663 // which does not use the class default class loader so we check for its loader here 1664 const InstanceKlass* ik = InstanceKlass::cast(holder); 1665 if ((ik->class_loader() != nullptr) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1666 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here 1667 } 1668 1669 // see if the klass name is well-known: 1670 Symbol* klass_name = ik->name(); 1671 vmSymbolID id = vmSymbols::find_sid(klass_name); 1672 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) { 1673 return id; 1674 } else { 1675 return vmSymbolID::NO_SID; 1676 } 1677 } 1678 1679 void Method::init_intrinsic_id(vmSymbolID klass_id) { 1680 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once"); 1681 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1682 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1683 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1684 1685 // the klass name is well-known: 1686 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be"); 1687 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility"); 1688 1689 // ditto for method and signature: 1690 vmSymbolID name_id = vmSymbols::find_sid(name()); 1691 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1692 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1693 && name_id == vmSymbolID::NO_SID) { 1694 return; 1695 } 1696 vmSymbolID sig_id = vmSymbols::find_sid(signature()); 1697 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1698 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1699 && sig_id == vmSymbolID::NO_SID) { 1700 return; 1701 } 1702 jshort flags = access_flags().as_short(); 1703 1704 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1705 if (id != vmIntrinsics::_none) { 1706 set_intrinsic_id(id); 1707 if (id == vmIntrinsics::_Class_cast) { 1708 // Even if the intrinsic is rejected, we want to inline this simple method. 1709 set_force_inline(); 1710 } 1711 return; 1712 } 1713 1714 // A few slightly irregular cases: 1715 switch (klass_id) { 1716 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1717 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1718 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1719 if (!is_native()) break; 1720 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1721 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1722 id = vmIntrinsics::_none; 1723 break; 1724 1725 default: 1726 break; 1727 } 1728 1729 if (id != vmIntrinsics::_none) { 1730 // Set up its iid. It is an alias method. 1731 set_intrinsic_id(id); 1732 return; 1733 } 1734 } 1735 1736 bool Method::load_signature_classes(const methodHandle& m, TRAPS) { 1737 if (!THREAD->can_call_java()) { 1738 // There is nothing useful this routine can do from within the Compile thread. 1739 // Hopefully, the signature contains only well-known classes. 1740 // We could scan for this and return true/false, but the caller won't care. 1741 return false; 1742 } 1743 bool sig_is_loaded = true; 1744 ResourceMark rm(THREAD); 1745 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) { 1746 if (ss.is_reference()) { 1747 // load everything, including arrays "[Lfoo;" 1748 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD); 1749 // We are loading classes eagerly. If a ClassNotFoundException or 1750 // a LinkageError was generated, be sure to ignore it. 1751 if (HAS_PENDING_EXCEPTION) { 1752 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) || 1753 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) { 1754 CLEAR_PENDING_EXCEPTION; 1755 } else { 1756 return false; 1757 } 1758 } 1759 if( klass == nullptr) { sig_is_loaded = false; } 1760 } 1761 } 1762 return sig_is_loaded; 1763 } 1764 1765 // Exposed so field engineers can debug VM 1766 void Method::print_short_name(outputStream* st) const { 1767 ResourceMark rm; 1768 #ifdef PRODUCT 1769 st->print(" %s::", method_holder()->external_name()); 1770 #else 1771 st->print(" %s::", method_holder()->internal_name()); 1772 #endif 1773 name()->print_symbol_on(st); 1774 if (WizardMode) signature()->print_symbol_on(st); 1775 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1776 MethodHandles::print_as_basic_type_signature_on(st, signature()); 1777 } 1778 1779 // Comparer for sorting an object array containing 1780 // Method*s. 1781 static int method_comparator(Method* a, Method* b) { 1782 return a->name()->fast_compare(b->name()); 1783 } 1784 1785 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1786 // default_methods also uses this without the ordering for fast find_method 1787 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) { 1788 int length = methods->length(); 1789 if (length > 1) { 1790 if (func == nullptr) { 1791 func = method_comparator; 1792 } 1793 { 1794 NoSafepointVerifier nsv; 1795 QuickSort::sort(methods->data(), length, func); 1796 } 1797 // Reset method ordering 1798 if (set_idnums) { 1799 for (u2 i = 0; i < length; i++) { 1800 Method* m = methods->at(i); 1801 m->set_method_idnum(i); 1802 m->set_orig_method_idnum(i); 1803 } 1804 } 1805 } 1806 } 1807 1808 //----------------------------------------------------------------------------------- 1809 // Non-product code unless JVM/TI needs it 1810 1811 #if !defined(PRODUCT) || INCLUDE_JVMTI 1812 class SignatureTypePrinter : public SignatureTypeNames { 1813 private: 1814 outputStream* _st; 1815 bool _use_separator; 1816 1817 void type_name(const char* name) { 1818 if (_use_separator) _st->print(", "); 1819 _st->print("%s", name); 1820 _use_separator = true; 1821 } 1822 1823 public: 1824 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1825 _st = st; 1826 _use_separator = false; 1827 } 1828 1829 void print_parameters() { _use_separator = false; do_parameters_on(this); } 1830 void print_returntype() { _use_separator = false; do_type(return_type()); } 1831 }; 1832 1833 1834 void Method::print_name(outputStream* st) const { 1835 Thread *thread = Thread::current(); 1836 ResourceMark rm(thread); 1837 st->print("%s ", is_static() ? "static" : "virtual"); 1838 if (WizardMode) { 1839 st->print("%s.", method_holder()->internal_name()); 1840 name()->print_symbol_on(st); 1841 signature()->print_symbol_on(st); 1842 } else { 1843 SignatureTypePrinter sig(signature(), st); 1844 sig.print_returntype(); 1845 st->print(" %s.", method_holder()->internal_name()); 1846 name()->print_symbol_on(st); 1847 st->print("("); 1848 sig.print_parameters(); 1849 st->print(")"); 1850 } 1851 } 1852 #endif // !PRODUCT || INCLUDE_JVMTI 1853 1854 1855 void Method::print_codes_on(outputStream* st, int flags) const { 1856 print_codes_on(0, code_size(), st, flags); 1857 } 1858 1859 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const { 1860 Thread *thread = Thread::current(); 1861 ResourceMark rm(thread); 1862 methodHandle mh (thread, (Method*)this); 1863 BytecodeTracer::print_method_codes(mh, from, to, st, flags); 1864 } 1865 1866 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1867 _bci = 0; 1868 _line = 0; 1869 }; 1870 1871 bool CompressedLineNumberReadStream::read_pair() { 1872 jubyte next = read_byte(); 1873 // Check for terminator 1874 if (next == 0) return false; 1875 if (next == 0xFF) { 1876 // Escape character, regular compression used 1877 _bci += read_signed_int(); 1878 _line += read_signed_int(); 1879 } else { 1880 // Single byte compression used 1881 _bci += next >> 3; 1882 _line += next & 0x7; 1883 } 1884 return true; 1885 } 1886 1887 #if INCLUDE_JVMTI 1888 1889 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1890 BreakpointInfo* bp = method_holder()->breakpoints(); 1891 for (; bp != nullptr; bp = bp->next()) { 1892 if (bp->match(this, bci)) { 1893 return bp->orig_bytecode(); 1894 } 1895 } 1896 { 1897 ResourceMark rm; 1898 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1899 } 1900 return Bytecodes::_shouldnotreachhere; 1901 } 1902 1903 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1904 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1905 BreakpointInfo* bp = method_holder()->breakpoints(); 1906 for (; bp != nullptr; bp = bp->next()) { 1907 if (bp->match(this, bci)) { 1908 bp->set_orig_bytecode(code); 1909 // and continue, in case there is more than one 1910 } 1911 } 1912 } 1913 1914 void Method::set_breakpoint(int bci) { 1915 InstanceKlass* ik = method_holder(); 1916 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1917 bp->set_next(ik->breakpoints()); 1918 ik->set_breakpoints(bp); 1919 // do this last: 1920 bp->set(this); 1921 } 1922 1923 static void clear_matches(Method* m, int bci) { 1924 InstanceKlass* ik = m->method_holder(); 1925 BreakpointInfo* prev_bp = nullptr; 1926 BreakpointInfo* next_bp; 1927 for (BreakpointInfo* bp = ik->breakpoints(); bp != nullptr; bp = next_bp) { 1928 next_bp = bp->next(); 1929 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1930 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1931 // do this first: 1932 bp->clear(m); 1933 // unhook it 1934 if (prev_bp != nullptr) 1935 prev_bp->set_next(next_bp); 1936 else 1937 ik->set_breakpoints(next_bp); 1938 delete bp; 1939 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1940 // at same location. So we have multiple matching (method_index and bci) 1941 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1942 // breakpoint for clear_breakpoint request and keep all other method versions 1943 // BreakpointInfo for future clear_breakpoint request. 1944 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1945 // which is being called when class is unloaded. We delete all the Breakpoint 1946 // information for all versions of method. We may not correctly restore the original 1947 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1948 // so these methods won't be used anymore. 1949 if (bci >= 0) { 1950 break; 1951 } 1952 } else { 1953 // This one is a keeper. 1954 prev_bp = bp; 1955 } 1956 } 1957 } 1958 1959 void Method::clear_breakpoint(int bci) { 1960 assert(bci >= 0, ""); 1961 clear_matches(this, bci); 1962 } 1963 1964 void Method::clear_all_breakpoints() { 1965 clear_matches(this, -1); 1966 } 1967 1968 #endif // INCLUDE_JVMTI 1969 1970 int Method::invocation_count() const { 1971 MethodCounters* mcs = method_counters(); 1972 MethodData* mdo = method_data(); 1973 if (((mcs != nullptr) ? mcs->invocation_counter()->carry() : false) || 1974 ((mdo != nullptr) ? mdo->invocation_counter()->carry() : false)) { 1975 return InvocationCounter::count_limit; 1976 } else { 1977 return ((mcs != nullptr) ? mcs->invocation_counter()->count() : 0) + 1978 ((mdo != nullptr) ? mdo->invocation_counter()->count() : 0); 1979 } 1980 } 1981 1982 int Method::backedge_count() const { 1983 MethodCounters* mcs = method_counters(); 1984 MethodData* mdo = method_data(); 1985 if (((mcs != nullptr) ? mcs->backedge_counter()->carry() : false) || 1986 ((mdo != nullptr) ? mdo->backedge_counter()->carry() : false)) { 1987 return InvocationCounter::count_limit; 1988 } else { 1989 return ((mcs != nullptr) ? mcs->backedge_counter()->count() : 0) + 1990 ((mdo != nullptr) ? mdo->backedge_counter()->count() : 0); 1991 } 1992 } 1993 1994 int Method::highest_comp_level() const { 1995 const MethodCounters* mcs = method_counters(); 1996 if (mcs != nullptr) { 1997 return mcs->highest_comp_level(); 1998 } else { 1999 return CompLevel_none; 2000 } 2001 } 2002 2003 int Method::highest_osr_comp_level() const { 2004 const MethodCounters* mcs = method_counters(); 2005 if (mcs != nullptr) { 2006 return mcs->highest_osr_comp_level(); 2007 } else { 2008 return CompLevel_none; 2009 } 2010 } 2011 2012 void Method::set_highest_comp_level(int level) { 2013 MethodCounters* mcs = method_counters(); 2014 if (mcs != nullptr) { 2015 mcs->set_highest_comp_level(level); 2016 } 2017 } 2018 2019 void Method::set_highest_osr_comp_level(int level) { 2020 MethodCounters* mcs = method_counters(); 2021 if (mcs != nullptr) { 2022 mcs->set_highest_osr_comp_level(level); 2023 } 2024 } 2025 2026 #if INCLUDE_JVMTI 2027 2028 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 2029 _bci = bci; 2030 _name_index = m->name_index(); 2031 _signature_index = m->signature_index(); 2032 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 2033 if (_orig_bytecode == Bytecodes::_breakpoint) 2034 _orig_bytecode = m->orig_bytecode_at(_bci); 2035 _next = nullptr; 2036 } 2037 2038 void BreakpointInfo::set(Method* method) { 2039 #ifdef ASSERT 2040 { 2041 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 2042 if (code == Bytecodes::_breakpoint) 2043 code = method->orig_bytecode_at(_bci); 2044 assert(orig_bytecode() == code, "original bytecode must be the same"); 2045 } 2046 #endif 2047 Thread *thread = Thread::current(); 2048 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 2049 method->incr_number_of_breakpoints(thread); 2050 { 2051 // Deoptimize all dependents on this method 2052 HandleMark hm(thread); 2053 methodHandle mh(thread, method); 2054 CodeCache::mark_dependents_on_method_for_breakpoint(mh); 2055 } 2056 } 2057 2058 void BreakpointInfo::clear(Method* method) { 2059 *method->bcp_from(_bci) = orig_bytecode(); 2060 assert(method->number_of_breakpoints() > 0, "must not go negative"); 2061 method->decr_number_of_breakpoints(Thread::current()); 2062 } 2063 2064 #endif // INCLUDE_JVMTI 2065 2066 // jmethodID handling 2067 2068 // This is a block allocating object, sort of like JNIHandleBlock, only a 2069 // lot simpler. 2070 // It's allocated on the CHeap because once we allocate a jmethodID, we can 2071 // never get rid of it. 2072 2073 static const int min_block_size = 8; 2074 2075 class JNIMethodBlockNode : public CHeapObj<mtClass> { 2076 friend class JNIMethodBlock; 2077 Method** _methods; 2078 int _number_of_methods; 2079 int _top; 2080 JNIMethodBlockNode* _next; 2081 2082 public: 2083 2084 JNIMethodBlockNode(int num_methods = min_block_size); 2085 2086 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 2087 2088 void ensure_methods(int num_addl_methods) { 2089 if (_top < _number_of_methods) { 2090 num_addl_methods -= _number_of_methods - _top; 2091 if (num_addl_methods <= 0) { 2092 return; 2093 } 2094 } 2095 if (_next == nullptr) { 2096 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 2097 } else { 2098 _next->ensure_methods(num_addl_methods); 2099 } 2100 } 2101 }; 2102 2103 class JNIMethodBlock : public CHeapObj<mtClass> { 2104 JNIMethodBlockNode _head; 2105 JNIMethodBlockNode *_last_free; 2106 public: 2107 static Method* const _free_method; 2108 2109 JNIMethodBlock(int initial_capacity = min_block_size) 2110 : _head(initial_capacity), _last_free(&_head) {} 2111 2112 void ensure_methods(int num_addl_methods) { 2113 _last_free->ensure_methods(num_addl_methods); 2114 } 2115 2116 Method** add_method(Method* m) { 2117 for (JNIMethodBlockNode* b = _last_free; b != nullptr; b = b->_next) { 2118 if (b->_top < b->_number_of_methods) { 2119 // top points to the next free entry. 2120 int i = b->_top; 2121 b->_methods[i] = m; 2122 b->_top++; 2123 _last_free = b; 2124 return &(b->_methods[i]); 2125 } else if (b->_top == b->_number_of_methods) { 2126 // if the next free entry ran off the block see if there's a free entry 2127 for (int i = 0; i < b->_number_of_methods; i++) { 2128 if (b->_methods[i] == _free_method) { 2129 b->_methods[i] = m; 2130 _last_free = b; 2131 return &(b->_methods[i]); 2132 } 2133 } 2134 // Only check each block once for frees. They're very unlikely. 2135 // Increment top past the end of the block. 2136 b->_top++; 2137 } 2138 // need to allocate a next block. 2139 if (b->_next == nullptr) { 2140 b->_next = _last_free = new JNIMethodBlockNode(); 2141 } 2142 } 2143 guarantee(false, "Should always allocate a free block"); 2144 return nullptr; 2145 } 2146 2147 bool contains(Method** m) { 2148 if (m == nullptr) return false; 2149 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2150 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2151 // This is a bit of extra checking, for two reasons. One is 2152 // that contains() deals with pointers that are passed in by 2153 // JNI code, so making sure that the pointer is aligned 2154 // correctly is valuable. The other is that <= and > are 2155 // technically not defined on pointers, so the if guard can 2156 // pass spuriously; no modern compiler is likely to make that 2157 // a problem, though (and if one did, the guard could also 2158 // fail spuriously, which would be bad). 2159 ptrdiff_t idx = m - b->_methods; 2160 if (b->_methods + idx == m) { 2161 return true; 2162 } 2163 } 2164 } 2165 return false; // not found 2166 } 2167 2168 // During class unloading the methods are cleared, which is different 2169 // than freed. 2170 void clear_all_methods() { 2171 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2172 for (int i = 0; i< b->_number_of_methods; i++) { 2173 b->_methods[i] = nullptr; 2174 } 2175 } 2176 } 2177 #ifndef PRODUCT 2178 int count_methods() { 2179 // count all allocated methods 2180 int count = 0; 2181 for (JNIMethodBlockNode* b = &_head; b != nullptr; b = b->_next) { 2182 for (int i = 0; i< b->_number_of_methods; i++) { 2183 if (b->_methods[i] != _free_method) count++; 2184 } 2185 } 2186 return count; 2187 } 2188 #endif // PRODUCT 2189 }; 2190 2191 // Something that can't be mistaken for an address or a markWord 2192 Method* const JNIMethodBlock::_free_method = (Method*)55; 2193 2194 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(nullptr) { 2195 _number_of_methods = MAX2(num_methods, min_block_size); 2196 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2197 for (int i = 0; i < _number_of_methods; i++) { 2198 _methods[i] = JNIMethodBlock::_free_method; 2199 } 2200 } 2201 2202 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) { 2203 // Have to add jmethod_ids() to class loader data thread-safely. 2204 // Also have to add the method to the list safely, which the lock 2205 // protects as well. 2206 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag); 2207 if (cld->jmethod_ids() == nullptr) { 2208 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2209 } else { 2210 cld->jmethod_ids()->ensure_methods(capacity); 2211 } 2212 } 2213 2214 // Add a method id to the jmethod_ids 2215 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) { 2216 // Have to add jmethod_ids() to class loader data thread-safely. 2217 // Also have to add the method to the list safely, which the lock 2218 // protects as well. 2219 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check"); 2220 2221 ResourceMark rm; 2222 log_debug(jmethod)("Creating jmethodID for Method %s", m->external_name()); 2223 if (cld->jmethod_ids() == nullptr) { 2224 cld->set_jmethod_ids(new JNIMethodBlock()); 2225 } 2226 // jmethodID is a pointer to Method* 2227 return (jmethodID)cld->jmethod_ids()->add_method(m); 2228 } 2229 2230 jmethodID Method::jmethod_id() { 2231 methodHandle mh(Thread::current(), this); 2232 return method_holder()->get_jmethod_id(mh); 2233 } 2234 2235 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2236 // Can't assert the method_holder is the same because the new method has the 2237 // scratch method holder. 2238 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2239 == new_method->method_holder()->class_loader() || 2240 new_method->method_holder()->class_loader() == nullptr, // allow Unsafe substitution 2241 "changing to a different class loader"); 2242 // Just change the method in place, jmethodID pointer doesn't change. 2243 *((Method**)jmid) = new_method; 2244 } 2245 2246 bool Method::is_method_id(jmethodID mid) { 2247 Method* m = resolve_jmethod_id(mid); 2248 assert(m != nullptr, "should be called with non-null method"); 2249 InstanceKlass* ik = m->method_holder(); 2250 ClassLoaderData* cld = ik->class_loader_data(); 2251 if (cld->jmethod_ids() == nullptr) return false; 2252 return (cld->jmethod_ids()->contains((Method**)mid)); 2253 } 2254 2255 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2256 if (mid == nullptr) return nullptr; 2257 Method* o = resolve_jmethod_id(mid); 2258 if (o == nullptr || o == JNIMethodBlock::_free_method) { 2259 return nullptr; 2260 } 2261 // Method should otherwise be valid. Assert for testing. 2262 assert(is_valid_method(o), "should be valid jmethodid"); 2263 // If the method's class holder object is unreferenced, but not yet marked as 2264 // unloaded, we need to return null here too because after a safepoint, its memory 2265 // will be reclaimed. 2266 return o->method_holder()->is_loader_alive() ? o : nullptr; 2267 }; 2268 2269 void Method::set_on_stack(const bool value) { 2270 // Set both the method itself and its constant pool. The constant pool 2271 // on stack means some method referring to it is also on the stack. 2272 constants()->set_on_stack(value); 2273 2274 bool already_set = on_stack_flag(); 2275 set_on_stack_flag(value); 2276 if (value && !already_set) { 2277 MetadataOnStackMark::record(this); 2278 } 2279 } 2280 2281 void Method::record_gc_epoch() { 2282 // If any method is on the stack in continuations, none of them can be reclaimed, 2283 // so save the marking cycle to check for the whole class in the cpCache. 2284 // The cpCache is writeable. 2285 constants()->cache()->record_gc_epoch(); 2286 } 2287 2288 // Called when the class loader is unloaded to make all methods weak. 2289 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2290 loader_data->jmethod_ids()->clear_all_methods(); 2291 } 2292 2293 void Method::clear_jmethod_id() { 2294 // Being at a safepoint prevents racing against other class redefinitions 2295 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); 2296 // The jmethodID is not stored in the Method instance, we need to look it up first 2297 jmethodID methodid = find_jmethod_id_or_null(); 2298 // We need to make sure that jmethodID actually resolves to this method 2299 // - multiple redefined versions may share jmethodID slots and if a method 2300 // has already been rewired to a newer version we could be removing reference 2301 // to a still existing method instance 2302 if (methodid != nullptr && *((Method**)methodid) == this) { 2303 *((Method**)methodid) = nullptr; 2304 } 2305 } 2306 2307 bool Method::has_method_vptr(const void* ptr) { 2308 Method m; 2309 // This assumes that the vtbl pointer is the first word of a C++ object. 2310 return dereference_vptr(&m) == dereference_vptr(ptr); 2311 } 2312 2313 // Check that this pointer is valid by checking that the vtbl pointer matches 2314 bool Method::is_valid_method(const Method* m) { 2315 if (m == nullptr) { 2316 return false; 2317 } else if ((intptr_t(m) & (wordSize-1)) != 0) { 2318 // Quick sanity check on pointer. 2319 return false; 2320 } else if (!os::is_readable_range(m, m + 1)) { 2321 return false; 2322 } else if (m->is_shared()) { 2323 return CppVtables::is_valid_shared_method(m); 2324 } else if (Metaspace::contains_non_shared(m)) { 2325 return has_method_vptr((const void*)m); 2326 } else { 2327 return false; 2328 } 2329 } 2330 2331 bool Method::is_scalarized_arg(int idx) const { 2332 if (!has_scalarized_args()) { 2333 return false; 2334 } 2335 // Search through signature and check if argument is wrapped in T_METADATA/T_VOID 2336 int depth = 0; 2337 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc(); 2338 for (int i = 0; i < sig->length(); i++) { 2339 BasicType bt = sig->at(i)._bt; 2340 if (bt == T_METADATA) { 2341 depth++; 2342 } 2343 if (idx == 0) { 2344 break; // Argument found 2345 } 2346 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) { 2347 depth--; 2348 } 2349 if (depth == 0 && bt != T_LONG && bt != T_DOUBLE) { 2350 idx--; // Advance to next argument 2351 } 2352 } 2353 return depth != 0; 2354 } 2355 2356 #ifndef PRODUCT 2357 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) { 2358 out->print("%d", loader_data->jmethod_ids()->count_methods()); 2359 } 2360 #endif // PRODUCT 2361 2362 2363 // Printing 2364 2365 #ifndef PRODUCT 2366 2367 void Method::print_on(outputStream* st) const { 2368 ResourceMark rm; 2369 assert(is_method(), "must be method"); 2370 st->print_cr("%s", internal_name()); 2371 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this)); 2372 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2373 st->print (" - constants: " PTR_FORMAT " ", p2i(constants())); 2374 constants()->print_value_on(st); st->cr(); 2375 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2376 st->print (" - flags: 0x%x ", _flags.as_int()); _flags.print_on(st); st->cr(); 2377 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2378 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2379 st->print_cr(" - max stack: %d", max_stack()); 2380 st->print_cr(" - max locals: %d", max_locals()); 2381 st->print_cr(" - size of params: %d", size_of_parameters()); 2382 st->print_cr(" - method size: %d", method_size()); 2383 if (intrinsic_id() != vmIntrinsics::_none) 2384 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id())); 2385 if (highest_comp_level() != CompLevel_none) 2386 st->print_cr(" - highest level: %d", highest_comp_level()); 2387 st->print_cr(" - vtable index: %d", _vtable_index); 2388 #ifdef ASSERT 2389 if (valid_itable_index()) 2390 st->print_cr(" - itable index: %d", itable_index()); 2391 #endif 2392 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry())); 2393 st->print( " - adapters: "); 2394 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2395 if (a == nullptr) 2396 st->print_cr(PTR_FORMAT, p2i(a)); 2397 else 2398 a->print_adapter_on(st); 2399 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry())); 2400 st->print_cr(" - compiled inline entry " PTR_FORMAT, p2i(from_compiled_inline_entry())); 2401 st->print_cr(" - compiled inline ro entry " PTR_FORMAT, p2i(from_compiled_inline_ro_entry())); 2402 st->print_cr(" - code size: %d", code_size()); 2403 if (code_size() != 0) { 2404 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base())); 2405 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size())); 2406 } 2407 if (method_data() != nullptr) { 2408 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data())); 2409 } 2410 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2411 if (checked_exceptions_length() > 0) { 2412 CheckedExceptionElement* table = checked_exceptions_start(); 2413 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table)); 2414 if (Verbose) { 2415 for (int i = 0; i < checked_exceptions_length(); i++) { 2416 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2417 } 2418 } 2419 } 2420 if (has_linenumber_table()) { 2421 u_char* table = compressed_linenumber_table(); 2422 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table)); 2423 if (Verbose) { 2424 CompressedLineNumberReadStream stream(table); 2425 while (stream.read_pair()) { 2426 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2427 } 2428 } 2429 } 2430 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2431 if (localvariable_table_length() > 0) { 2432 LocalVariableTableElement* table = localvariable_table_start(); 2433 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table)); 2434 if (Verbose) { 2435 for (int i = 0; i < localvariable_table_length(); i++) { 2436 int bci = table[i].start_bci; 2437 int len = table[i].length; 2438 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2439 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2440 int slot = table[i].slot; 2441 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2442 } 2443 } 2444 } 2445 if (code() != nullptr) { 2446 st->print (" - compiled code: "); 2447 code()->print_value_on(st); 2448 } 2449 if (is_native()) { 2450 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function())); 2451 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler())); 2452 } 2453 } 2454 2455 void Method::print_linkage_flags(outputStream* st) { 2456 access_flags().print_on(st); 2457 if (is_default_method()) { 2458 st->print("default "); 2459 } 2460 if (is_overpass()) { 2461 st->print("overpass "); 2462 } 2463 } 2464 #endif //PRODUCT 2465 2466 void Method::print_value_on(outputStream* st) const { 2467 assert(is_method(), "must be method"); 2468 st->print("%s", internal_name()); 2469 print_address_on(st); 2470 st->print(" "); 2471 if (WizardMode) access_flags().print_on(st); 2472 name()->print_value_on(st); 2473 st->print(" "); 2474 signature()->print_value_on(st); 2475 st->print(" in "); 2476 method_holder()->print_value_on(st); 2477 if (WizardMode) st->print("#%d", _vtable_index); 2478 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2479 if (WizardMode && code() != nullptr) st->print(" ((nmethod*)%p)", code()); 2480 } 2481 2482 // Verification 2483 2484 void Method::verify_on(outputStream* st) { 2485 guarantee(is_method(), "object must be method"); 2486 guarantee(constants()->is_constantPool(), "should be constant pool"); 2487 MethodData* md = method_data(); 2488 guarantee(md == nullptr || 2489 md->is_methodData(), "should be method data"); 2490 } --- EOF ---