1 /* 2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "cds/cppVtables.hpp" 27 #include "cds/metaspaceShared.hpp" 28 #include "classfile/classLoaderDataGraph.hpp" 29 #include "classfile/metadataOnStackMark.hpp" 30 #include "classfile/symbolTable.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "classfile/vmClasses.hpp" 33 #include "code/codeCache.hpp" 34 #include "code/debugInfoRec.hpp" 35 #include "compiler/compilationPolicy.hpp" 36 #include "gc/shared/collectedHeap.inline.hpp" 37 #include "interpreter/bytecodeStream.hpp" 38 #include "interpreter/bytecodeTracer.hpp" 39 #include "interpreter/bytecodes.hpp" 40 #include "interpreter/interpreter.hpp" 41 #include "interpreter/oopMapCache.hpp" 42 #include "logging/log.hpp" 43 #include "logging/logTag.hpp" 44 #include "logging/logStream.hpp" 45 #include "memory/allocation.inline.hpp" 46 #include "memory/metadataFactory.hpp" 47 #include "memory/metaspaceClosure.hpp" 48 #include "memory/oopFactory.hpp" 49 #include "memory/resourceArea.hpp" 50 #include "memory/universe.hpp" 51 #include "oops/constMethod.hpp" 52 #include "oops/constantPool.hpp" 53 #include "oops/klass.inline.hpp" 54 #include "oops/method.inline.hpp" 55 #include "oops/methodData.hpp" 56 #include "oops/objArrayKlass.hpp" 57 #include "oops/objArrayOop.inline.hpp" 58 #include "oops/oop.inline.hpp" 59 #include "oops/symbol.hpp" 60 #include "oops/inlineKlass.inline.hpp" 61 #include "prims/jvmtiExport.hpp" 62 #include "prims/methodHandles.hpp" 63 #include "runtime/arguments.hpp" 64 #include "runtime/atomic.hpp" 65 #include "runtime/continuationEntry.hpp" 66 #include "runtime/frame.inline.hpp" 67 #include "runtime/handles.inline.hpp" 68 #include "runtime/init.hpp" 69 #include "runtime/orderAccess.hpp" 70 #include "runtime/relocator.hpp" 71 #include "runtime/safepointVerifiers.hpp" 72 #include "runtime/sharedRuntime.hpp" 73 #include "runtime/signature.hpp" 74 #include "runtime/vm_version.hpp" 75 #include "services/memTracker.hpp" 76 #include "utilities/align.hpp" 77 #include "utilities/quickSort.hpp" 78 #include "utilities/vmError.hpp" 79 #include "utilities/xmlstream.hpp" 80 81 // Implementation of Method 82 83 Method* Method::allocate(ClassLoaderData* loader_data, 84 int byte_code_size, 85 AccessFlags access_flags, 86 InlineTableSizes* sizes, 87 ConstMethod::MethodType method_type, 88 Symbol* name, 89 TRAPS) { 90 assert(!access_flags.is_native() || byte_code_size == 0, 91 "native methods should not contain byte codes"); 92 ConstMethod* cm = ConstMethod::allocate(loader_data, 93 byte_code_size, 94 sizes, 95 method_type, 96 CHECK_NULL); 97 int size = Method::size(access_flags.is_native()); 98 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, name); 99 } 100 101 Method::Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name) { 102 NoSafepointVerifier no_safepoint; 103 set_constMethod(xconst); 104 set_access_flags(access_flags); 105 set_intrinsic_id(vmIntrinsics::_none); 106 set_force_inline(false); 107 set_hidden(false); 108 set_dont_inline(false); 109 set_changes_current_thread(false); 110 set_has_injected_profile(false); 111 set_method_data(NULL); 112 clear_method_counters(); 113 set_vtable_index(Method::garbage_vtable_index); 114 115 // Fix and bury in Method* 116 set_interpreter_entry(NULL); // sets i2i entry and from_int 117 set_adapter_entry(NULL); 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(NULL); 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(NULL); 134 MetadataFactory::free_metadata(loader_data, method_data()); 135 set_method_data(NULL); 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() != NULL) _code = NULL; 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() != NULL, "must have"); 153 return adapter()->get_i2c_entry(); 154 } 155 156 address Method::get_c2i_entry() { 157 assert(adapter() != NULL, "must have"); 158 return adapter()->get_c2i_entry(); 159 } 160 161 address Method::get_c2i_inline_entry() { 162 assert(adapter() != NULL, "must have"); 163 return adapter()->get_c2i_inline_entry(); 164 } 165 166 address Method::get_c2i_unverified_entry() { 167 assert(adapter() != NULL, "must have"); 168 return adapter()->get_c2i_unverified_entry(); 169 } 170 171 address Method::get_c2i_unverified_inline_entry() { 172 assert(adapter() != NULL, "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() != NULL, "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 == NULL ? "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 == NULL ? "NULL" : ex_klass->external_name(), mh->name()->as_C_string(), handler_bci); 274 } 275 return handler_bci; 276 } else if (ex_klass == NULL) { 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 != NULL, "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 == NULL ? "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 // Only GC uses the OopMapCache during thread stack root scanning 327 // any other uses generate an oopmap but do not save it in the cache. 328 if (Universe::heap()->is_gc_active()) { 329 method_holder()->mask_for(h_this, bci, mask); 330 } else { 331 OopMapCache::compute_one_oop_map(h_this, bci, mask); 332 } 333 return; 334 } 335 336 337 int Method::bci_from(address bcp) const { 338 if (is_native() && bcp == 0) { 339 return 0; 340 } 341 // Do not have a ResourceMark here because AsyncGetCallTrace stack walking code 342 // may call this after interrupting a nested ResourceMark. 343 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(), 344 "bcp doesn't belong to this method. bcp: " PTR_FORMAT, p2i(bcp)); 345 346 return bcp - code_base(); 347 } 348 349 350 int Method::validate_bci(int bci) const { 351 return (bci == 0 || bci < code_size()) ? bci : -1; 352 } 353 354 // Return bci if it appears to be a valid bcp 355 // Return -1 otherwise. 356 // Used by profiling code, when invalid data is a possibility. 357 // The caller is responsible for validating the Method* itself. 358 int Method::validate_bci_from_bcp(address bcp) const { 359 // keep bci as -1 if not a valid bci 360 int bci = -1; 361 if (bcp == 0 || bcp == code_base()) { 362 // code_size() may return 0 and we allow 0 here 363 // the method may be native 364 bci = 0; 365 } else if (contains(bcp)) { 366 bci = bcp - code_base(); 367 } 368 // Assert that if we have dodged any asserts, bci is negative. 369 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 370 return bci; 371 } 372 373 address Method::bcp_from(int bci) const { 374 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), 375 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native"); 376 address bcp = code_base() + bci; 377 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 378 return bcp; 379 } 380 381 address Method::bcp_from(address bcp) const { 382 if (is_native() && bcp == NULL) { 383 return code_base(); 384 } else { 385 return bcp; 386 } 387 } 388 389 int Method::size(bool is_native) { 390 // If native, then include pointers for native_function and signature_handler 391 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 392 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord; 393 return align_metadata_size(header_size() + extra_words); 394 } 395 396 Symbol* Method::klass_name() const { 397 return method_holder()->name(); 398 } 399 400 void Method::metaspace_pointers_do(MetaspaceClosure* it) { 401 log_trace(cds)("Iter(Method): %p", this); 402 403 if (!method_holder()->is_rewritten()) { 404 it->push(&_constMethod, MetaspaceClosure::_writable); 405 } else { 406 it->push(&_constMethod); 407 } 408 it->push(&_method_data); 409 it->push(&_method_counters); 410 NOT_PRODUCT(it->push(&_name);) 411 } 412 413 #if INCLUDE_CDS 414 // Attempt to return method to original state. Clear any pointers 415 // (to objects outside the shared spaces). We won't be able to predict 416 // where they should point in a new JVM. Further initialize some 417 // entries now in order allow them to be write protected later. 418 419 void Method::remove_unshareable_info() { 420 unlink_method(); 421 JFR_ONLY(REMOVE_METHOD_ID(this);) 422 } 423 424 void Method::restore_unshareable_info(TRAPS) { 425 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored"); 426 } 427 #endif 428 429 void Method::set_vtable_index(int index) { 430 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) { 431 // At runtime initialize_vtable is rerun as part of link_class_impl() 432 // for a shared class loaded by the non-boot loader to obtain the loader 433 // constraints based on the runtime classloaders' context. 434 return; // don't write into the shared class 435 } else { 436 _vtable_index = index; 437 } 438 } 439 440 void Method::set_itable_index(int index) { 441 if (is_shared() && !MetaspaceShared::remapped_readwrite() && method_holder()->verified_at_dump_time()) { 442 // At runtime initialize_itable is rerun as part of link_class_impl() 443 // for a shared class loaded by the non-boot loader to obtain the loader 444 // constraints based on the runtime classloaders' context. The dumptime 445 // itable index should be the same as the runtime index. 446 assert(_vtable_index == itable_index_max - index, 447 "archived itable index is different from runtime index"); 448 return; // don’t write into the shared class 449 } else { 450 _vtable_index = itable_index_max - index; 451 } 452 assert(valid_itable_index(), ""); 453 } 454 455 // The RegisterNatives call being attempted tried to register with a method that 456 // is not native. Ask JVM TI what prefixes have been specified. Then check 457 // to see if the native method is now wrapped with the prefixes. See the 458 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details. 459 static Method* find_prefixed_native(Klass* k, Symbol* name, Symbol* signature, TRAPS) { 460 #if INCLUDE_JVMTI 461 ResourceMark rm(THREAD); 462 Method* method; 463 int name_len = name->utf8_length(); 464 char* name_str = name->as_utf8(); 465 int prefix_count; 466 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count); 467 for (int i = 0; i < prefix_count; i++) { 468 char* prefix = prefixes[i]; 469 int prefix_len = (int)strlen(prefix); 470 471 // try adding this prefix to the method name and see if it matches another method name 472 int trial_len = name_len + prefix_len; 473 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1); 474 strcpy(trial_name_str, prefix); 475 strcat(trial_name_str, name_str); 476 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len); 477 if (trial_name == NULL) { 478 continue; // no such symbol, so this prefix wasn't used, try the next prefix 479 } 480 method = k->lookup_method(trial_name, signature); 481 if (method == NULL) { 482 continue; // signature doesn't match, try the next prefix 483 } 484 if (method->is_native()) { 485 method->set_is_prefixed_native(); 486 return method; // wahoo, we found a prefixed version of the method, return it 487 } 488 // found as non-native, so prefix is good, add it, probably just need more prefixes 489 name_len = trial_len; 490 name_str = trial_name_str; 491 } 492 #endif // INCLUDE_JVMTI 493 return NULL; // not found 494 } 495 496 bool Method::register_native(Klass* k, Symbol* name, Symbol* signature, address entry, TRAPS) { 497 Method* method = k->lookup_method(name, signature); 498 if (method == NULL) { 499 ResourceMark rm(THREAD); 500 stringStream st; 501 st.print("Method '"); 502 print_external_name(&st, k, name, signature); 503 st.print("' name or signature does not match"); 504 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false); 505 } 506 if (!method->is_native()) { 507 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es) 508 method = find_prefixed_native(k, name, signature, THREAD); 509 if (method == NULL) { 510 ResourceMark rm(THREAD); 511 stringStream st; 512 st.print("Method '"); 513 print_external_name(&st, k, name, signature); 514 st.print("' is not declared as native"); 515 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false); 516 } 517 } 518 519 if (entry != NULL) { 520 method->set_native_function(entry, native_bind_event_is_interesting); 521 } else { 522 method->clear_native_function(); 523 } 524 if (log_is_enabled(Debug, jni, resolve)) { 525 ResourceMark rm(THREAD); 526 log_debug(jni, resolve)("[Registering JNI native method %s.%s]", 527 method->method_holder()->external_name(), 528 method->name()->as_C_string()); 529 } 530 return true; 531 } 532 533 bool Method::was_executed_more_than(int n) { 534 // Invocation counter is reset when the Method* is compiled. 535 // If the method has compiled code we therefore assume it has 536 // be executed more than n times. 537 if (is_accessor() || is_empty_method() || (code() != NULL)) { 538 // interpreter doesn't bump invocation counter of trivial methods 539 // compiler does not bump invocation counter of compiled methods 540 return true; 541 } 542 else if ((method_counters() != NULL && 543 method_counters()->invocation_counter()->carry()) || 544 (method_data() != NULL && 545 method_data()->invocation_counter()->carry())) { 546 // The carry bit is set when the counter overflows and causes 547 // a compilation to occur. We don't know how many times 548 // the counter has been reset, so we simply assume it has 549 // been executed more than n times. 550 return true; 551 } else { 552 return invocation_count() > n; 553 } 554 } 555 556 void Method::print_invocation_count() { 557 //---< compose+print method return type, klass, name, and signature >--- 558 if (is_static()) tty->print("static "); 559 if (is_final()) tty->print("final "); 560 if (is_synchronized()) tty->print("synchronized "); 561 if (is_native()) tty->print("native "); 562 tty->print("%s::", method_holder()->external_name()); 563 name()->print_symbol_on(tty); 564 signature()->print_symbol_on(tty); 565 566 if (WizardMode) { 567 // dump the size of the byte codes 568 tty->print(" {%d}", code_size()); 569 } 570 tty->cr(); 571 572 // Counting based on signed int counters tends to overflow with 573 // longer-running workloads on fast machines. The counters under 574 // consideration here, however, are limited in range by counting 575 // logic. See InvocationCounter:count_limit for example. 576 // No "overflow precautions" need to be implemented here. 577 tty->print_cr (" interpreter_invocation_count: " INT32_FORMAT_W(11), interpreter_invocation_count()); 578 tty->print_cr (" invocation_counter: " INT32_FORMAT_W(11), invocation_count()); 579 tty->print_cr (" backedge_counter: " INT32_FORMAT_W(11), backedge_count()); 580 581 if (method_data() != NULL) { 582 tty->print_cr (" decompile_count: " UINT32_FORMAT_W(11), method_data()->decompile_count()); 583 } 584 585 #ifndef PRODUCT 586 if (CountCompiledCalls) { 587 tty->print_cr (" compiled_invocation_count: " INT64_FORMAT_W(11), compiled_invocation_count()); 588 } 589 #endif 590 } 591 592 // Build a MethodData* object to hold profiling information collected on this 593 // method when requested. 594 void Method::build_profiling_method_data(const methodHandle& method, TRAPS) { 595 // Do not profile the method if metaspace has hit an OOM previously 596 // allocating profiling data. Callers clear pending exception so don't 597 // add one here. 598 if (ClassLoaderDataGraph::has_metaspace_oom()) { 599 return; 600 } 601 602 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 603 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 604 if (HAS_PENDING_EXCEPTION) { 605 CompileBroker::log_metaspace_failure(); 606 ClassLoaderDataGraph::set_metaspace_oom(true); 607 return; // return the exception (which is cleared) 608 } 609 610 if (!Atomic::replace_if_null(&method->_method_data, method_data)) { 611 MetadataFactory::free_metadata(loader_data, method_data); 612 return; 613 } 614 615 if (PrintMethodData && (Verbose || WizardMode)) { 616 ResourceMark rm(THREAD); 617 tty->print("build_profiling_method_data for "); 618 method->print_name(tty); 619 tty->cr(); 620 // At the end of the run, the MDO, full of data, will be dumped. 621 } 622 } 623 624 MethodCounters* Method::build_method_counters(Thread* current, Method* m) { 625 // Do not profile the method if metaspace has hit an OOM previously 626 if (ClassLoaderDataGraph::has_metaspace_oom()) { 627 return NULL; 628 } 629 630 methodHandle mh(current, m); 631 MethodCounters* counters; 632 if (current->is_Java_thread()) { 633 JavaThread* THREAD = JavaThread::cast(current); // For exception macros. 634 // Use the TRAPS version for a JavaThread so it will adjust the GC threshold 635 // if needed. 636 counters = MethodCounters::allocate_with_exception(mh, THREAD); 637 if (HAS_PENDING_EXCEPTION) { 638 CLEAR_PENDING_EXCEPTION; 639 } 640 } else { 641 // Call metaspace allocation that doesn't throw exception if the 642 // current thread isn't a JavaThread, ie. the VMThread. 643 counters = MethodCounters::allocate_no_exception(mh); 644 } 645 646 if (counters == NULL) { 647 CompileBroker::log_metaspace_failure(); 648 ClassLoaderDataGraph::set_metaspace_oom(true); 649 return NULL; 650 } 651 652 if (!mh->init_method_counters(counters)) { 653 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 654 } 655 656 return mh->method_counters(); 657 } 658 659 bool Method::init_method_counters(MethodCounters* counters) { 660 // Try to install a pointer to MethodCounters, return true on success. 661 return Atomic::replace_if_null(&_method_counters, counters); 662 } 663 664 int Method::extra_stack_words() { 665 // not an inline function, to avoid a header dependency on Interpreter 666 return extra_stack_entries() * Interpreter::stackElementSize; 667 } 668 669 // Derive size of parameters, return type, and fingerprint, 670 // all in one pass, which is run at load time. 671 // We need the first two, and might as well grab the third. 672 void Method::compute_from_signature(Symbol* sig) { 673 // At this point, since we are scanning the signature, 674 // we might as well compute the whole fingerprint. 675 Fingerprinter fp(sig, is_static()); 676 set_size_of_parameters(fp.size_of_parameters()); 677 set_num_stack_arg_slots(fp.num_stack_arg_slots()); 678 constMethod()->set_result_type(fp.return_type()); 679 constMethod()->set_fingerprint(fp.fingerprint()); 680 } 681 682 // InlineKlass the method is declared to return. This must not 683 // safepoint as it is called with references live on the stack at 684 // locations the GC is unaware of. 685 InlineKlass* Method::returns_inline_type(Thread* thread) const { 686 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields"); 687 NoSafepointVerifier nsv; 688 SignatureStream ss(signature()); 689 while (!ss.at_return_type()) { 690 ss.next(); 691 } 692 return ss.as_inline_klass(method_holder()); 693 } 694 695 bool Method::is_vanilla_constructor() const { 696 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 697 // which only calls the superclass vanilla constructor and possibly does stores of 698 // zero constants to local fields: 699 // 700 // aload_0, _fast_aload_0, or _nofast_aload_0 701 // invokespecial 702 // indexbyte1 703 // indexbyte2 704 // 705 // followed by an (optional) sequence of: 706 // 707 // aload_0 708 // aconst_null / iconst_0 / fconst_0 / dconst_0 709 // putfield 710 // indexbyte1 711 // indexbyte2 712 // 713 // followed by: 714 // 715 // return 716 717 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 718 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 719 int size = code_size(); 720 // Check if size match 721 if (size == 0 || size % 5 != 0) return false; 722 address cb = code_base(); 723 int last = size - 1; 724 if ((cb[0] != Bytecodes::_aload_0 && cb[0] != Bytecodes::_fast_aload_0 && cb[0] != Bytecodes::_nofast_aload_0) || 725 cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 726 // Does not call superclass default constructor 727 return false; 728 } 729 // Check optional sequence 730 for (int i = 4; i < last; i += 5) { 731 if (cb[i] != Bytecodes::_aload_0) return false; 732 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 733 if (cb[i+2] != Bytecodes::_putfield) return false; 734 } 735 return true; 736 } 737 738 739 bool Method::compute_has_loops_flag() { 740 BytecodeStream bcs(methodHandle(Thread::current(), this)); 741 Bytecodes::Code bc; 742 743 while ((bc = bcs.next()) >= 0) { 744 switch (bc) { 745 case Bytecodes::_ifeq: 746 case Bytecodes::_ifnull: 747 case Bytecodes::_iflt: 748 case Bytecodes::_ifle: 749 case Bytecodes::_ifne: 750 case Bytecodes::_ifnonnull: 751 case Bytecodes::_ifgt: 752 case Bytecodes::_ifge: 753 case Bytecodes::_if_icmpeq: 754 case Bytecodes::_if_icmpne: 755 case Bytecodes::_if_icmplt: 756 case Bytecodes::_if_icmpgt: 757 case Bytecodes::_if_icmple: 758 case Bytecodes::_if_icmpge: 759 case Bytecodes::_if_acmpeq: 760 case Bytecodes::_if_acmpne: 761 case Bytecodes::_goto: 762 case Bytecodes::_jsr: 763 if (bcs.dest() < bcs.next_bci()) _access_flags.set_has_loops(); 764 break; 765 766 case Bytecodes::_goto_w: 767 case Bytecodes::_jsr_w: 768 if (bcs.dest_w() < bcs.next_bci()) _access_flags.set_has_loops(); 769 break; 770 771 case Bytecodes::_lookupswitch: { 772 Bytecode_lookupswitch lookupswitch(this, bcs.bcp()); 773 if (lookupswitch.default_offset() < 0) { 774 _access_flags.set_has_loops(); 775 } else { 776 for (int i = 0; i < lookupswitch.number_of_pairs(); ++i) { 777 LookupswitchPair pair = lookupswitch.pair_at(i); 778 if (pair.offset() < 0) { 779 _access_flags.set_has_loops(); 780 break; 781 } 782 } 783 } 784 break; 785 } 786 case Bytecodes::_tableswitch: { 787 Bytecode_tableswitch tableswitch(this, bcs.bcp()); 788 if (tableswitch.default_offset() < 0) { 789 _access_flags.set_has_loops(); 790 } else { 791 for (int i = 0; i < tableswitch.length(); ++i) { 792 if (tableswitch.dest_offset_at(i) < 0) { 793 _access_flags.set_has_loops(); 794 } 795 } 796 } 797 break; 798 } 799 default: 800 break; 801 } 802 } 803 _access_flags.set_loops_flag_init(); 804 return _access_flags.has_loops(); 805 } 806 807 bool Method::is_final_method(AccessFlags class_access_flags) const { 808 // or "does_not_require_vtable_entry" 809 // default method or overpass can occur, is not final (reuses vtable entry) 810 // private methods in classes get vtable entries for backward class compatibility. 811 if (is_overpass() || is_default_method()) return false; 812 return is_final() || class_access_flags.is_final(); 813 } 814 815 bool Method::is_final_method() const { 816 return is_final_method(method_holder()->access_flags()); 817 } 818 819 bool Method::is_default_method() const { 820 if (method_holder() != NULL && 821 method_holder()->is_interface() && 822 !is_abstract() && !is_private()) { 823 return true; 824 } else { 825 return false; 826 } 827 } 828 829 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 830 if (is_final_method(class_access_flags)) return true; 831 #ifdef ASSERT 832 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 833 if (class_access_flags.is_interface()) { 834 ResourceMark rm; 835 assert(is_nonv == is_static() || is_nonv == is_private(), 836 "nonvirtual unexpected for non-static, non-private: %s", 837 name_and_sig_as_C_string()); 838 } 839 #endif 840 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 841 return vtable_index() == nonvirtual_vtable_index; 842 } 843 844 bool Method::can_be_statically_bound() const { 845 return can_be_statically_bound(method_holder()->access_flags()); 846 } 847 848 bool Method::can_be_statically_bound(InstanceKlass* context) const { 849 return (method_holder() == context) && can_be_statically_bound(); 850 } 851 852 /** 853 * Returns false if this is one of specially treated methods for 854 * which we have to provide stack trace in throw in compiled code. 855 * Returns true otherwise. 856 */ 857 bool Method::can_omit_stack_trace() { 858 if (klass_name() == vmSymbols::sun_invoke_util_ValueConversions()) { 859 return false; // All methods in sun.invoke.util.ValueConversions 860 } 861 return true; 862 } 863 864 bool Method::is_accessor() const { 865 return is_getter() || is_setter(); 866 } 867 868 bool Method::is_getter() const { 869 if (code_size() != 5) return false; 870 if (size_of_parameters() != 1) return false; 871 if (java_code_at(0) != Bytecodes::_aload_0) return false; 872 if (java_code_at(1) != Bytecodes::_getfield) return false; 873 switch (java_code_at(4)) { 874 case Bytecodes::_ireturn: 875 case Bytecodes::_lreturn: 876 case Bytecodes::_freturn: 877 case Bytecodes::_dreturn: 878 case Bytecodes::_areturn: 879 break; 880 default: 881 return false; 882 } 883 if (has_scalarized_return()) { 884 // Don't treat this as (trivial) getter method because the 885 // inline type should be returned in a scalarized form. 886 return false; 887 } 888 return true; 889 } 890 891 bool Method::is_setter() const { 892 if (code_size() != 6) return false; 893 if (java_code_at(0) != Bytecodes::_aload_0) return false; 894 switch (java_code_at(1)) { 895 case Bytecodes::_iload_1: 896 case Bytecodes::_aload_1: 897 case Bytecodes::_fload_1: 898 if (size_of_parameters() != 2) return false; 899 break; 900 case Bytecodes::_dload_1: 901 case Bytecodes::_lload_1: 902 if (size_of_parameters() != 3) return false; 903 break; 904 default: 905 return false; 906 } 907 if (java_code_at(2) != Bytecodes::_putfield) return false; 908 if (java_code_at(5) != Bytecodes::_return) return false; 909 if (has_scalarized_args()) { 910 // Don't treat this as (trivial) setter method because the 911 // inline type argument should be passed in a scalarized form. 912 return false; 913 } 914 return true; 915 } 916 917 bool Method::is_constant_getter() const { 918 int last_index = code_size() - 1; 919 // Check if the first 1-3 bytecodes are a constant push 920 // and the last bytecode is a return. 921 return (2 <= code_size() && code_size() <= 4 && 922 Bytecodes::is_const(java_code_at(0)) && 923 Bytecodes::length_for(java_code_at(0)) == last_index && 924 Bytecodes::is_return(java_code_at(last_index)) && 925 !has_scalarized_args()); 926 } 927 928 bool Method::is_object_constructor_or_class_initializer() const { 929 return (is_object_constructor() || is_class_initializer()); 930 } 931 932 bool Method::is_class_initializer() const { 933 // For classfiles version 51 or greater, ensure that the clinit method is 934 // static. Non-static methods with the name "<clinit>" are not static 935 // initializers. (older classfiles exempted for backward compatibility) 936 return (name() == vmSymbols::class_initializer_name() && 937 (is_static() || 938 method_holder()->major_version() < 51)); 939 } 940 941 // A method named <init>, is a classic object constructor. 942 bool Method::is_object_constructor() const { 943 return name() == vmSymbols::object_initializer_name(); 944 } 945 946 // A method named <vnew> is a factory for an inline class. 947 bool Method::is_static_vnew_factory() const { 948 return name() == vmSymbols::inline_factory_name(); 949 } 950 951 bool Method::needs_clinit_barrier() const { 952 return is_static() && !method_holder()->is_initialized(); 953 } 954 955 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 956 int length = method->checked_exceptions_length(); 957 if (length == 0) { // common case 958 return objArrayHandle(THREAD, Universe::the_empty_class_array()); 959 } else { 960 methodHandle h_this(THREAD, method); 961 objArrayOop m_oop = oopFactory::new_objArray(vmClasses::Class_klass(), length, CHECK_(objArrayHandle())); 962 objArrayHandle mirrors (THREAD, m_oop); 963 for (int i = 0; i < length; i++) { 964 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 965 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 966 if (log_is_enabled(Warning, exceptions) && 967 !k->is_subclass_of(vmClasses::Throwable_klass())) { 968 ResourceMark rm(THREAD); 969 log_warning(exceptions)( 970 "Class %s in throws clause of method %s is not a subtype of class java.lang.Throwable", 971 k->external_name(), method->external_name()); 972 } 973 mirrors->obj_at_put(i, k->java_mirror()); 974 } 975 return mirrors; 976 } 977 }; 978 979 980 int Method::line_number_from_bci(int bci) const { 981 int best_bci = 0; 982 int best_line = -1; 983 if (bci == SynchronizationEntryBCI) bci = 0; 984 if (0 <= bci && bci < code_size() && has_linenumber_table()) { 985 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 986 // Not necessarily sorted and not necessarily one-to-one. 987 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 988 while (stream.read_pair()) { 989 if (stream.bci() == bci) { 990 // perfect match 991 return stream.line(); 992 } else { 993 // update best_bci/line 994 if (stream.bci() < bci && stream.bci() >= best_bci) { 995 best_bci = stream.bci(); 996 best_line = stream.line(); 997 } 998 } 999 } 1000 } 1001 return best_line; 1002 } 1003 1004 1005 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 1006 if( constants()->tag_at(klass_index).is_unresolved_klass()) { 1007 Thread *thread = Thread::current(); 1008 Symbol* klass_name = constants()->klass_name_at(klass_index); 1009 Handle loader(thread, method_holder()->class_loader()); 1010 Handle prot (thread, method_holder()->protection_domain()); 1011 return SystemDictionary::find_instance_klass(thread, klass_name, loader, prot) != NULL; 1012 } else { 1013 return true; 1014 } 1015 } 1016 1017 1018 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 1019 int klass_index = constants()->klass_ref_index_at(refinfo_index); 1020 if (must_be_resolved) { 1021 // Make sure klass is resolved in constantpool. 1022 if (constants()->tag_at(klass_index).is_unresolved_klass()) { 1023 return false; 1024 } 1025 } 1026 return is_klass_loaded_by_klass_index(klass_index); 1027 } 1028 1029 1030 void Method::set_native_function(address function, bool post_event_flag) { 1031 assert(function != NULL, "use clear_native_function to unregister natives"); 1032 assert(!is_special_native_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 1033 address* native_function = native_function_addr(); 1034 1035 // We can see racers trying to place the same native function into place. Once 1036 // is plenty. 1037 address current = *native_function; 1038 if (current == function) return; 1039 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 1040 function != NULL) { 1041 // native_method_throw_unsatisfied_link_error_entry() should only 1042 // be passed when post_event_flag is false. 1043 assert(function != 1044 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1045 "post_event_flag mismatch"); 1046 1047 // post the bind event, and possible change the bind function 1048 JvmtiExport::post_native_method_bind(this, &function); 1049 } 1050 *native_function = function; 1051 // This function can be called more than once. We must make sure that we always 1052 // use the latest registered method -> check if a stub already has been generated. 1053 // If so, we have to make it not_entrant. 1054 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates 1055 if (nm != NULL) { 1056 nm->make_not_entrant(); 1057 } 1058 } 1059 1060 1061 bool Method::has_native_function() const { 1062 if (is_special_native_intrinsic()) 1063 return false; // special-cased in SharedRuntime::generate_native_wrapper 1064 address func = native_function(); 1065 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 1066 } 1067 1068 1069 void Method::clear_native_function() { 1070 // Note: is_method_handle_intrinsic() is allowed here. 1071 set_native_function( 1072 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1073 !native_bind_event_is_interesting); 1074 this->unlink_code(); 1075 } 1076 1077 1078 void Method::set_signature_handler(address handler) { 1079 address* signature_handler = signature_handler_addr(); 1080 *signature_handler = handler; 1081 } 1082 1083 1084 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 1085 assert(reason != NULL, "must provide a reason"); 1086 if (PrintCompilation && report) { 1087 ttyLocker ttyl; 1088 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 1089 if (comp_level == CompLevel_all) { 1090 tty->print("all levels "); 1091 } else { 1092 tty->print("level %d ", comp_level); 1093 } 1094 this->print_short_name(tty); 1095 int size = this->code_size(); 1096 if (size > 0) { 1097 tty->print(" (%d bytes)", size); 1098 } 1099 if (reason != NULL) { 1100 tty->print(" %s", reason); 1101 } 1102 tty->cr(); 1103 } 1104 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 1105 ttyLocker ttyl; 1106 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 1107 os::current_thread_id(), is_osr, comp_level); 1108 if (reason != NULL) { 1109 xtty->print(" reason=\'%s\'", reason); 1110 } 1111 xtty->method(this); 1112 xtty->stamp(); 1113 xtty->end_elem(); 1114 } 1115 } 1116 1117 bool Method::is_always_compilable() const { 1118 // Generated adapters must be compiled 1119 if (is_special_native_intrinsic() && is_synthetic()) { 1120 assert(!is_not_c1_compilable(), "sanity check"); 1121 assert(!is_not_c2_compilable(), "sanity check"); 1122 return true; 1123 } 1124 1125 return false; 1126 } 1127 1128 bool Method::is_not_compilable(int comp_level) const { 1129 if (number_of_breakpoints() > 0) 1130 return true; 1131 if (is_always_compilable()) 1132 return false; 1133 if (comp_level == CompLevel_any) 1134 return is_not_c1_compilable() && is_not_c2_compilable(); 1135 if (is_c1_compile(comp_level)) 1136 return is_not_c1_compilable(); 1137 if (is_c2_compile(comp_level)) 1138 return is_not_c2_compilable(); 1139 return false; 1140 } 1141 1142 // call this when compiler finds that this method is not compilable 1143 void Method::set_not_compilable(const char* reason, int comp_level, bool report) { 1144 if (is_always_compilable()) { 1145 // Don't mark a method which should be always compilable 1146 return; 1147 } 1148 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 1149 if (comp_level == CompLevel_all) { 1150 set_not_c1_compilable(); 1151 set_not_c2_compilable(); 1152 } else { 1153 if (is_c1_compile(comp_level)) 1154 set_not_c1_compilable(); 1155 if (is_c2_compile(comp_level)) 1156 set_not_c2_compilable(); 1157 } 1158 assert(!CompilationPolicy::can_be_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check"); 1159 } 1160 1161 bool Method::is_not_osr_compilable(int comp_level) const { 1162 if (is_not_compilable(comp_level)) 1163 return true; 1164 if (comp_level == CompLevel_any) 1165 return is_not_c1_osr_compilable() && is_not_c2_osr_compilable(); 1166 if (is_c1_compile(comp_level)) 1167 return is_not_c1_osr_compilable(); 1168 if (is_c2_compile(comp_level)) 1169 return is_not_c2_osr_compilable(); 1170 return false; 1171 } 1172 1173 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) { 1174 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 1175 if (comp_level == CompLevel_all) { 1176 set_not_c1_osr_compilable(); 1177 set_not_c2_osr_compilable(); 1178 } else { 1179 if (is_c1_compile(comp_level)) 1180 set_not_c1_osr_compilable(); 1181 if (is_c2_compile(comp_level)) 1182 set_not_c2_osr_compilable(); 1183 } 1184 assert(!CompilationPolicy::can_be_osr_compiled(methodHandle(Thread::current(), this), comp_level), "sanity check"); 1185 } 1186 1187 // Revert to using the interpreter and clear out the nmethod 1188 void Method::clear_code() { 1189 // this may be NULL if c2i adapters have not been made yet 1190 // Only should happen at allocate time. 1191 if (adapter() == NULL) { 1192 _from_compiled_entry = NULL; 1193 _from_compiled_inline_entry = NULL; 1194 _from_compiled_inline_ro_entry = NULL; 1195 } else { 1196 _from_compiled_entry = adapter()->get_c2i_entry(); 1197 _from_compiled_inline_entry = adapter()->get_c2i_inline_entry(); 1198 _from_compiled_inline_ro_entry = adapter()->get_c2i_inline_ro_entry(); 1199 } 1200 OrderAccess::storestore(); 1201 _from_interpreted_entry = _i2i_entry; 1202 OrderAccess::storestore(); 1203 _code = NULL; 1204 } 1205 1206 void Method::unlink_code(CompiledMethod *compare) { 1207 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 1208 // We need to check if either the _code or _from_compiled_code_entry_point 1209 // refer to this nmethod because there is a race in setting these two fields 1210 // in Method* as seen in bugid 4947125. 1211 if (code() == compare || 1212 from_compiled_entry() == compare->verified_entry_point()) { 1213 clear_code(); 1214 } 1215 } 1216 1217 void Method::unlink_code() { 1218 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 1219 clear_code(); 1220 } 1221 1222 #if INCLUDE_CDS 1223 // Called by class data sharing to remove any entry points (which are not shared) 1224 void Method::unlink_method() { 1225 Arguments::assert_is_dumping_archive(); 1226 _code = NULL; 1227 _adapter = NULL; 1228 _i2i_entry = NULL; 1229 _from_compiled_entry = NULL; 1230 _from_compiled_inline_entry = NULL; 1231 _from_compiled_inline_ro_entry = NULL; 1232 _from_interpreted_entry = NULL; 1233 1234 if (is_native()) { 1235 *native_function_addr() = NULL; 1236 set_signature_handler(NULL); 1237 } 1238 NOT_PRODUCT(set_compiled_invocation_count(0);) 1239 1240 set_method_data(NULL); 1241 clear_method_counters(); 1242 } 1243 #endif 1244 1245 // Called when the method_holder is getting linked. Setup entrypoints so the method 1246 // is ready to be called from interpreter, compiler, and vtables. 1247 void Method::link_method(const methodHandle& h_method, TRAPS) { 1248 // If the code cache is full, we may reenter this function for the 1249 // leftover methods that weren't linked. 1250 if (adapter() != NULL) { 1251 return; 1252 } 1253 assert( _code == NULL, "nothing compiled yet" ); 1254 1255 // Setup interpreter entrypoint 1256 assert(this == h_method(), "wrong h_method()" ); 1257 1258 assert(adapter() == NULL, "init'd to NULL"); 1259 address entry = Interpreter::entry_for_method(h_method); 1260 assert(entry != NULL, "interpreter entry must be non-null"); 1261 // Sets both _i2i_entry and _from_interpreted_entry 1262 set_interpreter_entry(entry); 1263 1264 // Don't overwrite already registered native entries. 1265 if (is_native() && !has_native_function()) { 1266 set_native_function( 1267 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1268 !native_bind_event_is_interesting); 1269 } 1270 if (InlineTypeReturnedAsFields && returns_inline_type(THREAD)) { 1271 set_has_scalarized_return(true); 1272 } 1273 1274 // Setup compiler entrypoint. This is made eagerly, so we do not need 1275 // special handling of vtables. An alternative is to make adapters more 1276 // lazily by calling make_adapter() from from_compiled_entry() for the 1277 // normal calls. For vtable calls life gets more complicated. When a 1278 // call-site goes mega-morphic we need adapters in all methods which can be 1279 // called from the vtable. We need adapters on such methods that get loaded 1280 // later. Ditto for mega-morphic itable calls. If this proves to be a 1281 // problem we'll make these lazily later. 1282 (void) make_adapters(h_method, CHECK); 1283 1284 // ONLY USE the h_method now as make_adapter may have blocked 1285 1286 if (h_method->is_continuation_native_intrinsic()) { 1287 // the entry points to this method will be set in set_code, called when first resolving this method 1288 _from_interpreted_entry = NULL; 1289 _from_compiled_entry = NULL; 1290 _i2i_entry = NULL; 1291 } 1292 } 1293 1294 address Method::make_adapters(const methodHandle& mh, TRAPS) { 1295 // Adapters for compiled code are made eagerly here. They are fairly 1296 // small (generally < 100 bytes) and quick to make (and cached and shared) 1297 // so making them eagerly shouldn't be too expensive. 1298 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1299 if (adapter == NULL ) { 1300 if (!is_init_completed()) { 1301 // Don't throw exceptions during VM initialization because java.lang.* classes 1302 // might not have been initialized, causing problems when constructing the 1303 // Java exception object. 1304 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1305 } else { 1306 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters"); 1307 } 1308 } 1309 1310 mh->set_adapter_entry(adapter); 1311 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1312 mh->_from_compiled_inline_entry = adapter->get_c2i_inline_entry(); 1313 mh->_from_compiled_inline_ro_entry = adapter->get_c2i_inline_ro_entry(); 1314 return adapter->get_c2i_entry(); 1315 } 1316 1317 // The verified_code_entry() must be called when a invoke is resolved 1318 // on this method. 1319 1320 // It returns the compiled code entry point, after asserting not null. 1321 // This function is called after potential safepoints so that nmethod 1322 // or adapter that it points to is still live and valid. 1323 // This function must not hit a safepoint! 1324 address Method::verified_code_entry() { 1325 debug_only(NoSafepointVerifier nsv;) 1326 assert(_from_compiled_entry != NULL, "must be set"); 1327 return _from_compiled_entry; 1328 } 1329 1330 address Method::verified_inline_code_entry() { 1331 debug_only(NoSafepointVerifier nsv;) 1332 assert(_from_compiled_inline_entry != NULL, "must be set"); 1333 return _from_compiled_inline_entry; 1334 } 1335 1336 address Method::verified_inline_ro_code_entry() { 1337 debug_only(NoSafepointVerifier nsv;) 1338 assert(_from_compiled_inline_ro_entry != NULL, "must be set"); 1339 return _from_compiled_inline_ro_entry; 1340 } 1341 1342 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1343 // (could be racing a deopt). 1344 // Not inline to avoid circular ref. 1345 bool Method::check_code() const { 1346 // cached in a register or local. There's a race on the value of the field. 1347 CompiledMethod *code = Atomic::load_acquire(&_code); 1348 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 1349 } 1350 1351 // Install compiled code. Instantly it can execute. 1352 void Method::set_code(const methodHandle& mh, CompiledMethod *code) { 1353 assert_lock_strong(CompiledMethod_lock); 1354 assert( code, "use clear_code to remove code" ); 1355 assert( mh->check_code(), "" ); 1356 1357 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 1358 1359 // These writes must happen in this order, because the interpreter will 1360 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1361 // which jumps to _from_compiled_entry. 1362 mh->_code = code; // Assign before allowing compiled code to exec 1363 1364 int comp_level = code->comp_level(); 1365 // In theory there could be a race here. In practice it is unlikely 1366 // and not worth worrying about. 1367 if (comp_level > mh->highest_comp_level()) { 1368 mh->set_highest_comp_level(comp_level); 1369 } 1370 1371 OrderAccess::storestore(); 1372 mh->_from_compiled_entry = code->verified_entry_point(); 1373 mh->_from_compiled_inline_entry = code->verified_inline_entry_point(); 1374 mh->_from_compiled_inline_ro_entry = code->verified_inline_ro_entry_point(); 1375 OrderAccess::storestore(); 1376 1377 if (mh->is_continuation_native_intrinsic()) { 1378 assert(mh->_from_interpreted_entry == NULL, "initialized incorrectly"); // see link_method 1379 1380 if (mh->is_continuation_enter_intrinsic()) { 1381 // This is the entry used when we're in interpreter-only mode; see InterpreterMacroAssembler::jump_from_interpreted 1382 mh->_i2i_entry = ContinuationEntry::interpreted_entry(); 1383 } else if (mh->is_continuation_yield_intrinsic()) { 1384 mh->_i2i_entry = mh->get_i2c_entry(); 1385 } else { 1386 guarantee(false, "Unknown Continuation native intrinsic"); 1387 } 1388 // This must come last, as it is what's tested in LinkResolver::resolve_static_call 1389 Atomic::release_store(&mh->_from_interpreted_entry , mh->get_i2c_entry()); 1390 } else if (!mh->is_method_handle_intrinsic()) { 1391 // Instantly compiled code can execute. 1392 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1393 } 1394 } 1395 1396 1397 bool Method::is_overridden_in(Klass* k) const { 1398 InstanceKlass* ik = InstanceKlass::cast(k); 1399 1400 if (ik->is_interface()) return false; 1401 1402 // If method is an interface, we skip it - except if it 1403 // is a miranda method 1404 if (method_holder()->is_interface()) { 1405 // Check that method is not a miranda method 1406 if (ik->lookup_method(name(), signature()) == NULL) { 1407 // No implementation exist - so miranda method 1408 return false; 1409 } 1410 return true; 1411 } 1412 1413 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1414 if (!has_vtable_index()) { 1415 return false; 1416 } else { 1417 Method* vt_m = ik->method_at_vtable(vtable_index()); 1418 return vt_m != this; 1419 } 1420 } 1421 1422 1423 // give advice about whether this Method* should be cached or not 1424 bool Method::should_not_be_cached() const { 1425 if (is_old()) { 1426 // This method has been redefined. It is either EMCP or obsolete 1427 // and we don't want to cache it because that would pin the method 1428 // down and prevent it from being collectible if and when it 1429 // finishes executing. 1430 return true; 1431 } 1432 1433 // caching this method should be just fine 1434 return false; 1435 } 1436 1437 1438 /** 1439 * Returns true if this is one of the specially treated methods for 1440 * security related stack walks (like Reflection.getCallerClass). 1441 */ 1442 bool Method::is_ignored_by_security_stack_walk() const { 1443 if (intrinsic_id() == vmIntrinsics::_invoke) { 1444 // This is Method.invoke() -- ignore it 1445 return true; 1446 } 1447 if (method_holder()->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass())) { 1448 // This is an auxiliary frame -- ignore it 1449 return true; 1450 } 1451 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1452 // This is an internal adapter frame for method handles -- ignore it 1453 return true; 1454 } 1455 return false; 1456 } 1457 1458 1459 // Constant pool structure for invoke methods: 1460 enum { 1461 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1462 _imcp_invoke_signature, // utf8: (variable Symbol*) 1463 _imcp_limit 1464 }; 1465 1466 // Test if this method is an MH adapter frame generated by Java code. 1467 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1468 bool Method::is_compiled_lambda_form() const { 1469 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1470 } 1471 1472 // Test if this method is an internal MH primitive method. 1473 bool Method::is_method_handle_intrinsic() const { 1474 vmIntrinsics::ID iid = intrinsic_id(); 1475 return (MethodHandles::is_signature_polymorphic(iid) && 1476 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1477 } 1478 1479 bool Method::has_member_arg() const { 1480 vmIntrinsics::ID iid = intrinsic_id(); 1481 return (MethodHandles::is_signature_polymorphic(iid) && 1482 MethodHandles::has_member_arg(iid)); 1483 } 1484 1485 // Make an instance of a signature-polymorphic internal MH primitive. 1486 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1487 Symbol* signature, 1488 TRAPS) { 1489 ResourceMark rm(THREAD); 1490 methodHandle empty; 1491 1492 InstanceKlass* holder = vmClasses::MethodHandle_klass(); 1493 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1494 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1495 1496 log_info(methodhandles)("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1497 1498 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1499 name->increment_refcount(); 1500 signature->increment_refcount(); 1501 1502 int cp_length = _imcp_limit; 1503 ClassLoaderData* loader_data = holder->class_loader_data(); 1504 constantPoolHandle cp; 1505 { 1506 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1507 cp = constantPoolHandle(THREAD, cp_oop); 1508 } 1509 cp->copy_fields(holder->constants()); 1510 cp->set_pool_holder(holder); 1511 cp->symbol_at_put(_imcp_invoke_name, name); 1512 cp->symbol_at_put(_imcp_invoke_signature, signature); 1513 cp->set_has_preresolution(); 1514 1515 // decide on access bits: public or not? 1516 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1517 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1518 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1519 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1520 1521 methodHandle m; 1522 { 1523 InlineTableSizes sizes; 1524 Method* m_oop = Method::allocate(loader_data, 0, 1525 accessFlags_from(flags_bits), &sizes, 1526 ConstMethod::NORMAL, 1527 name, 1528 CHECK_(empty)); 1529 m = methodHandle(THREAD, m_oop); 1530 } 1531 m->set_constants(cp()); 1532 m->set_name_index(_imcp_invoke_name); 1533 m->set_signature_index(_imcp_invoke_signature); 1534 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1535 assert(m->signature() == signature, ""); 1536 m->compute_from_signature(signature); 1537 m->init_intrinsic_id(klass_id_for_intrinsics(m->method_holder())); 1538 assert(m->is_method_handle_intrinsic(), ""); 1539 #ifdef ASSERT 1540 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1541 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1542 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1543 #endif //ASSERT 1544 1545 // Finally, set up its entry points. 1546 assert(m->can_be_statically_bound(), ""); 1547 m->set_vtable_index(Method::nonvirtual_vtable_index); 1548 m->link_method(m, CHECK_(empty)); 1549 1550 if (iid == vmIntrinsics::_linkToNative) { 1551 m->set_interpreter_entry(m->adapter()->get_i2c_entry()); 1552 } 1553 if (log_is_enabled(Debug, methodhandles)) { 1554 LogTarget(Debug, methodhandles) lt; 1555 LogStream ls(lt); 1556 m->print_on(&ls); 1557 } 1558 1559 return m; 1560 } 1561 1562 Klass* Method::check_non_bcp_klass(Klass* klass) { 1563 if (klass != NULL && klass->class_loader() != NULL) { 1564 if (klass->is_objArray_klass()) 1565 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1566 return klass; 1567 } 1568 return NULL; 1569 } 1570 1571 1572 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, 1573 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1574 // Code below does not work for native methods - they should never get rewritten anyway 1575 assert(!m->is_native(), "cannot rewrite native methods"); 1576 // Allocate new Method* 1577 AccessFlags flags = m->access_flags(); 1578 1579 ConstMethod* cm = m->constMethod(); 1580 int checked_exceptions_len = cm->checked_exceptions_length(); 1581 int localvariable_len = cm->localvariable_table_length(); 1582 int exception_table_len = cm->exception_table_length(); 1583 int method_parameters_len = cm->method_parameters_length(); 1584 int method_annotations_len = cm->method_annotations_length(); 1585 int parameter_annotations_len = cm->parameter_annotations_length(); 1586 int type_annotations_len = cm->type_annotations_length(); 1587 int default_annotations_len = cm->default_annotations_length(); 1588 1589 InlineTableSizes sizes( 1590 localvariable_len, 1591 new_compressed_linenumber_size, 1592 exception_table_len, 1593 checked_exceptions_len, 1594 method_parameters_len, 1595 cm->generic_signature_index(), 1596 method_annotations_len, 1597 parameter_annotations_len, 1598 type_annotations_len, 1599 default_annotations_len, 1600 0); 1601 1602 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1603 Method* newm_oop = Method::allocate(loader_data, 1604 new_code_length, 1605 flags, 1606 &sizes, 1607 m->method_type(), 1608 m->name(), 1609 CHECK_(methodHandle())); 1610 methodHandle newm (THREAD, newm_oop); 1611 1612 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1613 ConstMethod* newcm = newm->constMethod(); 1614 int new_const_method_size = newm->constMethod()->size(); 1615 1616 // This works because the source and target are both Methods. Some compilers 1617 // (e.g., clang) complain that the target vtable pointer will be stomped, 1618 // so cast away newm()'s and m()'s Methodness. 1619 memcpy((void*)newm(), (void*)m(), sizeof(Method)); 1620 1621 // Create shallow copy of ConstMethod. 1622 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1623 1624 // Reset correct method/const method, method size, and parameter info 1625 newm->set_constMethod(newcm); 1626 newm->constMethod()->set_code_size(new_code_length); 1627 newm->constMethod()->set_constMethod_size(new_const_method_size); 1628 assert(newm->code_size() == new_code_length, "check"); 1629 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1630 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1631 assert(newm->exception_table_length() == exception_table_len, "check"); 1632 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1633 // Copy new byte codes 1634 memcpy(newm->code_base(), new_code, new_code_length); 1635 // Copy line number table 1636 if (new_compressed_linenumber_size > 0) { 1637 memcpy(newm->compressed_linenumber_table(), 1638 new_compressed_linenumber_table, 1639 new_compressed_linenumber_size); 1640 } 1641 // Copy method_parameters 1642 if (method_parameters_len > 0) { 1643 memcpy(newm->method_parameters_start(), 1644 m->method_parameters_start(), 1645 method_parameters_len * sizeof(MethodParametersElement)); 1646 } 1647 // Copy checked_exceptions 1648 if (checked_exceptions_len > 0) { 1649 memcpy(newm->checked_exceptions_start(), 1650 m->checked_exceptions_start(), 1651 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1652 } 1653 // Copy exception table 1654 if (exception_table_len > 0) { 1655 memcpy(newm->exception_table_start(), 1656 m->exception_table_start(), 1657 exception_table_len * sizeof(ExceptionTableElement)); 1658 } 1659 // Copy local variable number table 1660 if (localvariable_len > 0) { 1661 memcpy(newm->localvariable_table_start(), 1662 m->localvariable_table_start(), 1663 localvariable_len * sizeof(LocalVariableTableElement)); 1664 } 1665 // Copy stackmap table 1666 if (m->has_stackmap_table()) { 1667 int code_attribute_length = m->stackmap_data()->length(); 1668 Array<u1>* stackmap_data = 1669 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_(methodHandle())); 1670 memcpy((void*)stackmap_data->adr_at(0), 1671 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1672 newm->set_stackmap_data(stackmap_data); 1673 } 1674 1675 // copy annotations over to new method 1676 newcm->copy_annotations_from(loader_data, cm, CHECK_(methodHandle())); 1677 return newm; 1678 } 1679 1680 vmSymbolID Method::klass_id_for_intrinsics(const Klass* holder) { 1681 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1682 // because we are not loading from core libraries 1683 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1684 // which does not use the class default class loader so we check for its loader here 1685 const InstanceKlass* ik = InstanceKlass::cast(holder); 1686 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1687 return vmSymbolID::NO_SID; // regardless of name, no intrinsics here 1688 } 1689 1690 // see if the klass name is well-known: 1691 Symbol* klass_name = ik->name(); 1692 vmSymbolID id = vmSymbols::find_sid(klass_name); 1693 if (id != vmSymbolID::NO_SID && vmIntrinsics::class_has_intrinsics(id)) { 1694 return id; 1695 } else { 1696 return vmSymbolID::NO_SID; 1697 } 1698 } 1699 1700 void Method::init_intrinsic_id(vmSymbolID klass_id) { 1701 assert(_intrinsic_id == static_cast<int>(vmIntrinsics::_none), "do this just once"); 1702 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1703 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1704 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1705 1706 // the klass name is well-known: 1707 assert(klass_id == klass_id_for_intrinsics(method_holder()), "must be"); 1708 assert(klass_id != vmSymbolID::NO_SID, "caller responsibility"); 1709 1710 // ditto for method and signature: 1711 vmSymbolID name_id = vmSymbols::find_sid(name()); 1712 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1713 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1714 && name_id == vmSymbolID::NO_SID) { 1715 return; 1716 } 1717 vmSymbolID sig_id = vmSymbols::find_sid(signature()); 1718 if (klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1719 && klass_id != VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1720 && sig_id == vmSymbolID::NO_SID) { 1721 return; 1722 } 1723 jshort flags = access_flags().as_short(); 1724 1725 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1726 if (id != vmIntrinsics::_none) { 1727 set_intrinsic_id(id); 1728 if (id == vmIntrinsics::_Class_cast) { 1729 // Even if the intrinsic is rejected, we want to inline this simple method. 1730 set_force_inline(true); 1731 } 1732 return; 1733 } 1734 1735 // A few slightly irregular cases: 1736 switch (klass_id) { 1737 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1738 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1739 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1740 if (!is_native()) break; 1741 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1742 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1743 id = vmIntrinsics::_none; 1744 break; 1745 1746 default: 1747 break; 1748 } 1749 1750 if (id != vmIntrinsics::_none) { 1751 // Set up its iid. It is an alias method. 1752 set_intrinsic_id(id); 1753 return; 1754 } 1755 } 1756 1757 bool Method::load_signature_classes(const methodHandle& m, TRAPS) { 1758 if (!THREAD->can_call_java()) { 1759 // There is nothing useful this routine can do from within the Compile thread. 1760 // Hopefully, the signature contains only well-known classes. 1761 // We could scan for this and return true/false, but the caller won't care. 1762 return false; 1763 } 1764 bool sig_is_loaded = true; 1765 ResourceMark rm(THREAD); 1766 for (ResolvingSignatureStream ss(m()); !ss.is_done(); ss.next()) { 1767 if (ss.is_reference()) { 1768 // load everything, including arrays "[Lfoo;" 1769 Klass* klass = ss.as_klass(SignatureStream::ReturnNull, THREAD); 1770 // We are loading classes eagerly. If a ClassNotFoundException or 1771 // a LinkageError was generated, be sure to ignore it. 1772 if (HAS_PENDING_EXCEPTION) { 1773 if (PENDING_EXCEPTION->is_a(vmClasses::ClassNotFoundException_klass()) || 1774 PENDING_EXCEPTION->is_a(vmClasses::LinkageError_klass())) { 1775 CLEAR_PENDING_EXCEPTION; 1776 } else { 1777 return false; 1778 } 1779 } 1780 if( klass == NULL) { sig_is_loaded = false; } 1781 } 1782 } 1783 return sig_is_loaded; 1784 } 1785 1786 // Exposed so field engineers can debug VM 1787 void Method::print_short_name(outputStream* st) const { 1788 ResourceMark rm; 1789 #ifdef PRODUCT 1790 st->print(" %s::", method_holder()->external_name()); 1791 #else 1792 st->print(" %s::", method_holder()->internal_name()); 1793 #endif 1794 name()->print_symbol_on(st); 1795 if (WizardMode) signature()->print_symbol_on(st); 1796 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1797 MethodHandles::print_as_basic_type_signature_on(st, signature()); 1798 } 1799 1800 // Comparer for sorting an object array containing 1801 // Method*s. 1802 static int method_comparator(Method* a, Method* b) { 1803 return a->name()->fast_compare(b->name()); 1804 } 1805 1806 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1807 // default_methods also uses this without the ordering for fast find_method 1808 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) { 1809 int length = methods->length(); 1810 if (length > 1) { 1811 if (func == NULL) { 1812 func = method_comparator; 1813 } 1814 { 1815 NoSafepointVerifier nsv; 1816 QuickSort::sort(methods->data(), length, func, /*idempotent=*/false); 1817 } 1818 // Reset method ordering 1819 if (set_idnums) { 1820 for (int i = 0; i < length; i++) { 1821 Method* m = methods->at(i); 1822 m->set_method_idnum(i); 1823 m->set_orig_method_idnum(i); 1824 } 1825 } 1826 } 1827 } 1828 1829 //----------------------------------------------------------------------------------- 1830 // Non-product code unless JVM/TI needs it 1831 1832 #if !defined(PRODUCT) || INCLUDE_JVMTI 1833 class SignatureTypePrinter : public SignatureTypeNames { 1834 private: 1835 outputStream* _st; 1836 bool _use_separator; 1837 1838 void type_name(const char* name) { 1839 if (_use_separator) _st->print(", "); 1840 _st->print("%s", name); 1841 _use_separator = true; 1842 } 1843 1844 public: 1845 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1846 _st = st; 1847 _use_separator = false; 1848 } 1849 1850 void print_parameters() { _use_separator = false; do_parameters_on(this); } 1851 void print_returntype() { _use_separator = false; do_type(return_type()); } 1852 }; 1853 1854 1855 void Method::print_name(outputStream* st) const { 1856 Thread *thread = Thread::current(); 1857 ResourceMark rm(thread); 1858 st->print("%s ", is_static() ? "static" : "virtual"); 1859 if (WizardMode) { 1860 st->print("%s.", method_holder()->internal_name()); 1861 name()->print_symbol_on(st); 1862 signature()->print_symbol_on(st); 1863 } else { 1864 SignatureTypePrinter sig(signature(), st); 1865 sig.print_returntype(); 1866 st->print(" %s.", method_holder()->internal_name()); 1867 name()->print_symbol_on(st); 1868 st->print("("); 1869 sig.print_parameters(); 1870 st->print(")"); 1871 } 1872 } 1873 #endif // !PRODUCT || INCLUDE_JVMTI 1874 1875 1876 void Method::print_codes_on(outputStream* st, int flags) const { 1877 print_codes_on(0, code_size(), st, flags); 1878 } 1879 1880 void Method::print_codes_on(int from, int to, outputStream* st, int flags) const { 1881 Thread *thread = Thread::current(); 1882 ResourceMark rm(thread); 1883 methodHandle mh (thread, (Method*)this); 1884 BytecodeTracer::print_method_codes(mh, from, to, st, flags); 1885 } 1886 1887 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1888 _bci = 0; 1889 _line = 0; 1890 }; 1891 1892 bool CompressedLineNumberReadStream::read_pair() { 1893 jubyte next = read_byte(); 1894 // Check for terminator 1895 if (next == 0) return false; 1896 if (next == 0xFF) { 1897 // Escape character, regular compression used 1898 _bci += read_signed_int(); 1899 _line += read_signed_int(); 1900 } else { 1901 // Single byte compression used 1902 _bci += next >> 3; 1903 _line += next & 0x7; 1904 } 1905 return true; 1906 } 1907 1908 #if INCLUDE_JVMTI 1909 1910 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1911 BreakpointInfo* bp = method_holder()->breakpoints(); 1912 for (; bp != NULL; bp = bp->next()) { 1913 if (bp->match(this, bci)) { 1914 return bp->orig_bytecode(); 1915 } 1916 } 1917 { 1918 ResourceMark rm; 1919 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1920 } 1921 return Bytecodes::_shouldnotreachhere; 1922 } 1923 1924 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1925 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1926 BreakpointInfo* bp = method_holder()->breakpoints(); 1927 for (; bp != NULL; bp = bp->next()) { 1928 if (bp->match(this, bci)) { 1929 bp->set_orig_bytecode(code); 1930 // and continue, in case there is more than one 1931 } 1932 } 1933 } 1934 1935 void Method::set_breakpoint(int bci) { 1936 InstanceKlass* ik = method_holder(); 1937 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1938 bp->set_next(ik->breakpoints()); 1939 ik->set_breakpoints(bp); 1940 // do this last: 1941 bp->set(this); 1942 } 1943 1944 static void clear_matches(Method* m, int bci) { 1945 InstanceKlass* ik = m->method_holder(); 1946 BreakpointInfo* prev_bp = NULL; 1947 BreakpointInfo* next_bp; 1948 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1949 next_bp = bp->next(); 1950 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1951 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1952 // do this first: 1953 bp->clear(m); 1954 // unhook it 1955 if (prev_bp != NULL) 1956 prev_bp->set_next(next_bp); 1957 else 1958 ik->set_breakpoints(next_bp); 1959 delete bp; 1960 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1961 // at same location. So we have multiple matching (method_index and bci) 1962 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1963 // breakpoint for clear_breakpoint request and keep all other method versions 1964 // BreakpointInfo for future clear_breakpoint request. 1965 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1966 // which is being called when class is unloaded. We delete all the Breakpoint 1967 // information for all versions of method. We may not correctly restore the original 1968 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1969 // so these methods won't be used anymore. 1970 if (bci >= 0) { 1971 break; 1972 } 1973 } else { 1974 // This one is a keeper. 1975 prev_bp = bp; 1976 } 1977 } 1978 } 1979 1980 void Method::clear_breakpoint(int bci) { 1981 assert(bci >= 0, ""); 1982 clear_matches(this, bci); 1983 } 1984 1985 void Method::clear_all_breakpoints() { 1986 clear_matches(this, -1); 1987 } 1988 1989 #endif // INCLUDE_JVMTI 1990 1991 int Method::invocation_count() const { 1992 MethodCounters* mcs = method_counters(); 1993 MethodData* mdo = method_data(); 1994 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1995 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1996 return InvocationCounter::count_limit; 1997 } else { 1998 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1999 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 2000 } 2001 } 2002 2003 int Method::backedge_count() const { 2004 MethodCounters* mcs = method_counters(); 2005 MethodData* mdo = method_data(); 2006 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 2007 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 2008 return InvocationCounter::count_limit; 2009 } else { 2010 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 2011 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 2012 } 2013 } 2014 2015 int Method::highest_comp_level() const { 2016 const MethodCounters* mcs = method_counters(); 2017 if (mcs != NULL) { 2018 return mcs->highest_comp_level(); 2019 } else { 2020 return CompLevel_none; 2021 } 2022 } 2023 2024 int Method::highest_osr_comp_level() const { 2025 const MethodCounters* mcs = method_counters(); 2026 if (mcs != NULL) { 2027 return mcs->highest_osr_comp_level(); 2028 } else { 2029 return CompLevel_none; 2030 } 2031 } 2032 2033 void Method::set_highest_comp_level(int level) { 2034 MethodCounters* mcs = method_counters(); 2035 if (mcs != NULL) { 2036 mcs->set_highest_comp_level(level); 2037 } 2038 } 2039 2040 void Method::set_highest_osr_comp_level(int level) { 2041 MethodCounters* mcs = method_counters(); 2042 if (mcs != NULL) { 2043 mcs->set_highest_osr_comp_level(level); 2044 } 2045 } 2046 2047 #if INCLUDE_JVMTI 2048 2049 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 2050 _bci = bci; 2051 _name_index = m->name_index(); 2052 _signature_index = m->signature_index(); 2053 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 2054 if (_orig_bytecode == Bytecodes::_breakpoint) 2055 _orig_bytecode = m->orig_bytecode_at(_bci); 2056 _next = NULL; 2057 } 2058 2059 void BreakpointInfo::set(Method* method) { 2060 #ifdef ASSERT 2061 { 2062 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 2063 if (code == Bytecodes::_breakpoint) 2064 code = method->orig_bytecode_at(_bci); 2065 assert(orig_bytecode() == code, "original bytecode must be the same"); 2066 } 2067 #endif 2068 Thread *thread = Thread::current(); 2069 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 2070 method->incr_number_of_breakpoints(thread); 2071 { 2072 // Deoptimize all dependents on this method 2073 HandleMark hm(thread); 2074 methodHandle mh(thread, method); 2075 CodeCache::flush_dependents_on_method(mh); 2076 } 2077 } 2078 2079 void BreakpointInfo::clear(Method* method) { 2080 *method->bcp_from(_bci) = orig_bytecode(); 2081 assert(method->number_of_breakpoints() > 0, "must not go negative"); 2082 method->decr_number_of_breakpoints(Thread::current()); 2083 } 2084 2085 #endif // INCLUDE_JVMTI 2086 2087 // jmethodID handling 2088 2089 // This is a block allocating object, sort of like JNIHandleBlock, only a 2090 // lot simpler. 2091 // It's allocated on the CHeap because once we allocate a jmethodID, we can 2092 // never get rid of it. 2093 2094 static const int min_block_size = 8; 2095 2096 class JNIMethodBlockNode : public CHeapObj<mtClass> { 2097 friend class JNIMethodBlock; 2098 Method** _methods; 2099 int _number_of_methods; 2100 int _top; 2101 JNIMethodBlockNode* _next; 2102 2103 public: 2104 2105 JNIMethodBlockNode(int num_methods = min_block_size); 2106 2107 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 2108 2109 void ensure_methods(int num_addl_methods) { 2110 if (_top < _number_of_methods) { 2111 num_addl_methods -= _number_of_methods - _top; 2112 if (num_addl_methods <= 0) { 2113 return; 2114 } 2115 } 2116 if (_next == NULL) { 2117 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 2118 } else { 2119 _next->ensure_methods(num_addl_methods); 2120 } 2121 } 2122 }; 2123 2124 class JNIMethodBlock : public CHeapObj<mtClass> { 2125 JNIMethodBlockNode _head; 2126 JNIMethodBlockNode *_last_free; 2127 public: 2128 static Method* const _free_method; 2129 2130 JNIMethodBlock(int initial_capacity = min_block_size) 2131 : _head(initial_capacity), _last_free(&_head) {} 2132 2133 void ensure_methods(int num_addl_methods) { 2134 _last_free->ensure_methods(num_addl_methods); 2135 } 2136 2137 Method** add_method(Method* m) { 2138 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) { 2139 if (b->_top < b->_number_of_methods) { 2140 // top points to the next free entry. 2141 int i = b->_top; 2142 b->_methods[i] = m; 2143 b->_top++; 2144 _last_free = b; 2145 return &(b->_methods[i]); 2146 } else if (b->_top == b->_number_of_methods) { 2147 // if the next free entry ran off the block see if there's a free entry 2148 for (int i = 0; i < b->_number_of_methods; i++) { 2149 if (b->_methods[i] == _free_method) { 2150 b->_methods[i] = m; 2151 _last_free = b; 2152 return &(b->_methods[i]); 2153 } 2154 } 2155 // Only check each block once for frees. They're very unlikely. 2156 // Increment top past the end of the block. 2157 b->_top++; 2158 } 2159 // need to allocate a next block. 2160 if (b->_next == NULL) { 2161 b->_next = _last_free = new JNIMethodBlockNode(); 2162 } 2163 } 2164 guarantee(false, "Should always allocate a free block"); 2165 return NULL; 2166 } 2167 2168 bool contains(Method** m) { 2169 if (m == NULL) return false; 2170 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2171 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2172 // This is a bit of extra checking, for two reasons. One is 2173 // that contains() deals with pointers that are passed in by 2174 // JNI code, so making sure that the pointer is aligned 2175 // correctly is valuable. The other is that <= and > are 2176 // technically not defined on pointers, so the if guard can 2177 // pass spuriously; no modern compiler is likely to make that 2178 // a problem, though (and if one did, the guard could also 2179 // fail spuriously, which would be bad). 2180 ptrdiff_t idx = m - b->_methods; 2181 if (b->_methods + idx == m) { 2182 return true; 2183 } 2184 } 2185 } 2186 return false; // not found 2187 } 2188 2189 // Doesn't really destroy it, just marks it as free so it can be reused. 2190 void destroy_method(Method** m) { 2191 #ifdef ASSERT 2192 assert(contains(m), "should be a methodID"); 2193 #endif // ASSERT 2194 *m = _free_method; 2195 } 2196 2197 // During class unloading the methods are cleared, which is different 2198 // than freed. 2199 void clear_all_methods() { 2200 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2201 for (int i = 0; i< b->_number_of_methods; i++) { 2202 b->_methods[i] = NULL; 2203 } 2204 } 2205 } 2206 #ifndef PRODUCT 2207 int count_methods() { 2208 // count all allocated methods 2209 int count = 0; 2210 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2211 for (int i = 0; i< b->_number_of_methods; i++) { 2212 if (b->_methods[i] != _free_method) count++; 2213 } 2214 } 2215 return count; 2216 } 2217 #endif // PRODUCT 2218 }; 2219 2220 // Something that can't be mistaken for an address or a markWord 2221 Method* const JNIMethodBlock::_free_method = (Method*)55; 2222 2223 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(NULL) { 2224 _number_of_methods = MAX2(num_methods, min_block_size); 2225 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2226 for (int i = 0; i < _number_of_methods; i++) { 2227 _methods[i] = JNIMethodBlock::_free_method; 2228 } 2229 } 2230 2231 void Method::ensure_jmethod_ids(ClassLoaderData* cld, int capacity) { 2232 // Have to add jmethod_ids() to class loader data thread-safely. 2233 // Also have to add the method to the list safely, which the lock 2234 // protects as well. 2235 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag); 2236 if (cld->jmethod_ids() == NULL) { 2237 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2238 } else { 2239 cld->jmethod_ids()->ensure_methods(capacity); 2240 } 2241 } 2242 2243 // Add a method id to the jmethod_ids 2244 jmethodID Method::make_jmethod_id(ClassLoaderData* cld, Method* m) { 2245 // Have to add jmethod_ids() to class loader data thread-safely. 2246 // Also have to add the method to the list safely, which the lock 2247 // protects as well. 2248 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check"); 2249 if (cld->jmethod_ids() == NULL) { 2250 cld->set_jmethod_ids(new JNIMethodBlock()); 2251 } 2252 // jmethodID is a pointer to Method* 2253 return (jmethodID)cld->jmethod_ids()->add_method(m); 2254 } 2255 2256 jmethodID Method::jmethod_id() { 2257 methodHandle mh(Thread::current(), this); 2258 return method_holder()->get_jmethod_id(mh); 2259 } 2260 2261 // Mark a jmethodID as free. This is called when there is a data race in 2262 // InstanceKlass while creating the jmethodID cache. 2263 void Method::destroy_jmethod_id(ClassLoaderData* cld, jmethodID m) { 2264 Method** ptr = (Method**)m; 2265 assert(cld->jmethod_ids() != NULL, "should have method handles"); 2266 cld->jmethod_ids()->destroy_method(ptr); 2267 } 2268 2269 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2270 // Can't assert the method_holder is the same because the new method has the 2271 // scratch method holder. 2272 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2273 == new_method->method_holder()->class_loader() || 2274 new_method->method_holder()->class_loader() == NULL, // allow Unsafe substitution 2275 "changing to a different class loader"); 2276 // Just change the method in place, jmethodID pointer doesn't change. 2277 *((Method**)jmid) = new_method; 2278 } 2279 2280 bool Method::is_method_id(jmethodID mid) { 2281 Method* m = resolve_jmethod_id(mid); 2282 assert(m != NULL, "should be called with non-null method"); 2283 InstanceKlass* ik = m->method_holder(); 2284 ClassLoaderData* cld = ik->class_loader_data(); 2285 if (cld->jmethod_ids() == NULL) return false; 2286 return (cld->jmethod_ids()->contains((Method**)mid)); 2287 } 2288 2289 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2290 if (mid == NULL) return NULL; 2291 Method* o = resolve_jmethod_id(mid); 2292 if (o == NULL || o == JNIMethodBlock::_free_method) { 2293 return NULL; 2294 } 2295 // Method should otherwise be valid. Assert for testing. 2296 assert(is_valid_method(o), "should be valid jmethodid"); 2297 // If the method's class holder object is unreferenced, but not yet marked as 2298 // unloaded, we need to return NULL here too because after a safepoint, its memory 2299 // will be reclaimed. 2300 return o->method_holder()->is_loader_alive() ? o : NULL; 2301 }; 2302 2303 void Method::set_on_stack(const bool value) { 2304 // Set both the method itself and its constant pool. The constant pool 2305 // on stack means some method referring to it is also on the stack. 2306 constants()->set_on_stack(value); 2307 2308 bool already_set = on_stack(); 2309 _access_flags.set_on_stack(value); 2310 if (value && !already_set) { 2311 MetadataOnStackMark::record(this); 2312 } 2313 } 2314 2315 void Method::record_gc_epoch() { 2316 // If any method is on the stack in continuations, none of them can be reclaimed, 2317 // so save the marking cycle to check for the whole class in the cpCache. 2318 // The cpCache is writeable. 2319 constants()->cache()->record_gc_epoch(); 2320 } 2321 2322 // Called when the class loader is unloaded to make all methods weak. 2323 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2324 loader_data->jmethod_ids()->clear_all_methods(); 2325 } 2326 2327 bool Method::has_method_vptr(const void* ptr) { 2328 Method m; 2329 // This assumes that the vtbl pointer is the first word of a C++ object. 2330 return dereference_vptr(&m) == dereference_vptr(ptr); 2331 } 2332 2333 // Check that this pointer is valid by checking that the vtbl pointer matches 2334 bool Method::is_valid_method(const Method* m) { 2335 if (m == NULL) { 2336 return false; 2337 } else if ((intptr_t(m) & (wordSize-1)) != 0) { 2338 // Quick sanity check on pointer. 2339 return false; 2340 } else if (!os::is_readable_range(m, m + 1)) { 2341 return false; 2342 } else if (m->is_shared()) { 2343 return CppVtables::is_valid_shared_method(m); 2344 } else if (Metaspace::contains_non_shared(m)) { 2345 return has_method_vptr((const void*)m); 2346 } else { 2347 return false; 2348 } 2349 } 2350 2351 bool Method::is_scalarized_arg(int idx) const { 2352 if (!has_scalarized_args()) { 2353 return false; 2354 } 2355 // Search through signature and check if argument is wrapped in T_PRIMITIVE_OBJECT/T_VOID 2356 int depth = 0; 2357 const GrowableArray<SigEntry>* sig = adapter()->get_sig_cc(); 2358 for (int i = 0; i < sig->length(); i++) { 2359 BasicType bt = sig->at(i)._bt; 2360 if (bt == T_PRIMITIVE_OBJECT) { 2361 depth++; 2362 } 2363 if (idx == 0) { 2364 break; // Argument found 2365 } 2366 if (bt == T_VOID && (sig->at(i-1)._bt != T_LONG && sig->at(i-1)._bt != T_DOUBLE)) { 2367 depth--; 2368 } 2369 if (depth == 0 && bt != T_LONG && bt != T_DOUBLE) { 2370 idx--; // Advance to next argument 2371 } 2372 } 2373 return depth != 0; 2374 } 2375 2376 #ifndef PRODUCT 2377 void Method::print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) { 2378 out->print("%d", loader_data->jmethod_ids()->count_methods()); 2379 } 2380 #endif // PRODUCT 2381 2382 2383 // Printing 2384 2385 #ifndef PRODUCT 2386 2387 void Method::print_on(outputStream* st) const { 2388 ResourceMark rm; 2389 assert(is_method(), "must be method"); 2390 st->print_cr("%s", internal_name()); 2391 st->print_cr(" - this oop: " PTR_FORMAT, p2i(this)); 2392 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2393 st->print (" - constants: " PTR_FORMAT " ", p2i(constants())); 2394 constants()->print_value_on(st); st->cr(); 2395 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2396 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2397 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2398 st->print_cr(" - max stack: %d", max_stack()); 2399 st->print_cr(" - max locals: %d", max_locals()); 2400 st->print_cr(" - size of params: %d", size_of_parameters()); 2401 st->print_cr(" - method size: %d", method_size()); 2402 if (intrinsic_id() != vmIntrinsics::_none) 2403 st->print_cr(" - intrinsic id: %d %s", vmIntrinsics::as_int(intrinsic_id()), vmIntrinsics::name_at(intrinsic_id())); 2404 if (highest_comp_level() != CompLevel_none) 2405 st->print_cr(" - highest level: %d", highest_comp_level()); 2406 st->print_cr(" - vtable index: %d", _vtable_index); 2407 #ifdef ASSERT 2408 if (valid_itable_index()) 2409 st->print_cr(" - itable index: %d", itable_index()); 2410 #endif 2411 st->print_cr(" - i2i entry: " PTR_FORMAT, p2i(interpreter_entry())); 2412 st->print( " - adapters: "); 2413 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2414 if (a == NULL) 2415 st->print_cr(PTR_FORMAT, p2i(a)); 2416 else 2417 a->print_adapter_on(st); 2418 st->print_cr(" - compiled entry " PTR_FORMAT, p2i(from_compiled_entry())); 2419 st->print_cr(" - compiled inline entry " PTR_FORMAT, p2i(from_compiled_inline_entry())); 2420 st->print_cr(" - compiled inline ro entry " PTR_FORMAT, p2i(from_compiled_inline_ro_entry())); 2421 st->print_cr(" - code size: %d", code_size()); 2422 if (code_size() != 0) { 2423 st->print_cr(" - code start: " PTR_FORMAT, p2i(code_base())); 2424 st->print_cr(" - code end (excl): " PTR_FORMAT, p2i(code_base() + code_size())); 2425 } 2426 if (method_data() != NULL) { 2427 st->print_cr(" - method data: " PTR_FORMAT, p2i(method_data())); 2428 } 2429 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2430 if (checked_exceptions_length() > 0) { 2431 CheckedExceptionElement* table = checked_exceptions_start(); 2432 st->print_cr(" - checked ex start: " PTR_FORMAT, p2i(table)); 2433 if (Verbose) { 2434 for (int i = 0; i < checked_exceptions_length(); i++) { 2435 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2436 } 2437 } 2438 } 2439 if (has_linenumber_table()) { 2440 u_char* table = compressed_linenumber_table(); 2441 st->print_cr(" - linenumber start: " PTR_FORMAT, p2i(table)); 2442 if (Verbose) { 2443 CompressedLineNumberReadStream stream(table); 2444 while (stream.read_pair()) { 2445 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2446 } 2447 } 2448 } 2449 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2450 if (localvariable_table_length() > 0) { 2451 LocalVariableTableElement* table = localvariable_table_start(); 2452 st->print_cr(" - localvar start: " PTR_FORMAT, p2i(table)); 2453 if (Verbose) { 2454 for (int i = 0; i < localvariable_table_length(); i++) { 2455 int bci = table[i].start_bci; 2456 int len = table[i].length; 2457 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2458 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2459 int slot = table[i].slot; 2460 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2461 } 2462 } 2463 } 2464 if (code() != NULL) { 2465 st->print (" - compiled code: "); 2466 code()->print_value_on(st); 2467 } 2468 if (is_native()) { 2469 st->print_cr(" - native function: " PTR_FORMAT, p2i(native_function())); 2470 st->print_cr(" - signature handler: " PTR_FORMAT, p2i(signature_handler())); 2471 } 2472 } 2473 2474 void Method::print_linkage_flags(outputStream* st) { 2475 access_flags().print_on(st); 2476 if (is_default_method()) { 2477 st->print("default "); 2478 } 2479 if (is_overpass()) { 2480 st->print("overpass "); 2481 } 2482 } 2483 #endif //PRODUCT 2484 2485 void Method::print_value_on(outputStream* st) const { 2486 assert(is_method(), "must be method"); 2487 st->print("%s", internal_name()); 2488 print_address_on(st); 2489 st->print(" "); 2490 if (WizardMode) access_flags().print_on(st); 2491 name()->print_value_on(st); 2492 st->print(" "); 2493 signature()->print_value_on(st); 2494 st->print(" in "); 2495 method_holder()->print_value_on(st); 2496 if (WizardMode) st->print("#%d", _vtable_index); 2497 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2498 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2499 } 2500 2501 // Verification 2502 2503 void Method::verify_on(outputStream* st) { 2504 guarantee(is_method(), "object must be method"); 2505 guarantee(constants()->is_constantPool(), "should be constant pool"); 2506 MethodData* md = method_data(); 2507 guarantee(md == NULL || 2508 md->is_methodData(), "should be method data"); 2509 }