1 /* 2 * Copyright (c) 1997, 2019, 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 "classfile/classLoaderDataGraph.hpp" 27 #include "classfile/metadataOnStackMark.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "code/codeCache.hpp" 30 #include "code/debugInfoRec.hpp" 31 #include "gc/shared/collectedHeap.inline.hpp" 32 #include "interpreter/bytecodeStream.hpp" 33 #include "interpreter/bytecodeTracer.hpp" 34 #include "interpreter/bytecodes.hpp" 35 #include "interpreter/interpreter.hpp" 36 #include "interpreter/oopMapCache.hpp" 37 #include "memory/allocation.inline.hpp" 38 #include "memory/heapInspection.hpp" 39 #include "memory/metadataFactory.hpp" 40 #include "memory/metaspaceClosure.hpp" 41 #include "memory/metaspaceShared.hpp" 42 #include "memory/oopFactory.hpp" 43 #include "memory/resourceArea.hpp" 44 #include "memory/universe.hpp" 45 #include "oops/constMethod.hpp" 46 #include "oops/constantPool.hpp" 47 #include "oops/method.inline.hpp" 48 #include "oops/methodData.hpp" 49 #include "oops/objArrayKlass.hpp" 50 #include "oops/objArrayOop.inline.hpp" 51 #include "oops/oop.inline.hpp" 52 #include "oops/symbol.hpp" 53 #include "oops/valueKlass.hpp" 54 #include "prims/jvmtiExport.hpp" 55 #include "prims/methodHandles.hpp" 56 #include "prims/nativeLookup.hpp" 57 #include "runtime/arguments.hpp" 58 #include "runtime/compilationPolicy.hpp" 59 #include "runtime/frame.inline.hpp" 60 #include "runtime/handles.inline.hpp" 61 #include "runtime/init.hpp" 62 #include "runtime/orderAccess.hpp" 63 #include "runtime/relocator.hpp" 64 #include "runtime/safepointVerifiers.hpp" 65 #include "runtime/sharedRuntime.hpp" 66 #include "runtime/signature.hpp" 67 #include "utilities/align.hpp" 68 #include "utilities/quickSort.hpp" 69 #include "utilities/vmError.hpp" 70 #include "utilities/xmlstream.hpp" 71 72 // Implementation of Method 73 74 Method* Method::allocate(ClassLoaderData* loader_data, 75 int byte_code_size, 76 AccessFlags access_flags, 77 InlineTableSizes* sizes, 78 ConstMethod::MethodType method_type, 79 TRAPS) { 80 assert(!access_flags.is_native() || byte_code_size == 0, 81 "native methods should not contain byte codes"); 82 ConstMethod* cm = ConstMethod::allocate(loader_data, 83 byte_code_size, 84 sizes, 85 method_type, 86 CHECK_NULL); 87 int size = Method::size(access_flags.is_native()); 88 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags); 89 } 90 91 Method::Method(ConstMethod* xconst, AccessFlags access_flags) { 92 NoSafepointVerifier no_safepoint; 93 set_constMethod(xconst); 94 set_access_flags(access_flags); 95 set_intrinsic_id(vmIntrinsics::_none); 96 set_force_inline(false); 97 set_hidden(false); 98 set_dont_inline(false); 99 set_has_injected_profile(false); 100 set_method_data(NULL); 101 clear_method_counters(); 102 set_vtable_index(Method::garbage_vtable_index); 103 104 // Fix and bury in Method* 105 set_interpreter_entry(NULL); // sets i2i entry and from_int 106 set_adapter_entry(NULL); 107 Method::clear_code(); // from_c/from_i get set to c2i/i2i 108 109 if (access_flags.is_native()) { 110 clear_native_function(); 111 set_signature_handler(NULL); 112 } 113 NOT_PRODUCT(set_compiled_invocation_count(0);) 114 } 115 116 // Release Method*. The nmethod will be gone when we get here because 117 // we've walked the code cache. 118 void Method::deallocate_contents(ClassLoaderData* loader_data) { 119 MetadataFactory::free_metadata(loader_data, constMethod()); 120 set_constMethod(NULL); 121 #if INCLUDE_JVMCI 122 if (method_data()) { 123 FailedSpeculation::free_failed_speculations(method_data()->get_failed_speculations_address()); 124 } 125 #endif 126 MetadataFactory::free_metadata(loader_data, method_data()); 127 set_method_data(NULL); 128 MetadataFactory::free_metadata(loader_data, method_counters()); 129 clear_method_counters(); 130 // The nmethod will be gone when we get here. 131 if (code() != NULL) _code = NULL; 132 } 133 134 address Method::get_i2c_entry() { 135 assert(adapter() != NULL, "must have"); 136 return adapter()->get_i2c_entry(); 137 } 138 139 address Method::get_c2i_entry() { 140 assert(adapter() != NULL, "must have"); 141 return adapter()->get_c2i_entry(); 142 } 143 144 address Method::get_c2i_value_entry() { 145 assert(adapter() != NULL, "must have"); 146 return adapter()->get_c2i_value_entry(); 147 } 148 149 address Method::get_c2i_unverified_entry() { 150 assert(adapter() != NULL, "must have"); 151 return adapter()->get_c2i_unverified_entry(); 152 } 153 154 address Method::get_c2i_unverified_value_entry() { 155 assert(adapter() != NULL, "must have"); 156 return adapter()->get_c2i_unverified_value_entry(); 157 } 158 159 char* Method::name_and_sig_as_C_string() const { 160 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 161 } 162 163 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 164 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 165 } 166 167 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 168 const char* klass_name = klass->external_name(); 169 int klass_name_len = (int)strlen(klass_name); 170 int method_name_len = method_name->utf8_length(); 171 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 172 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 173 strcpy(dest, klass_name); 174 dest[klass_name_len] = '.'; 175 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 176 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 177 dest[len] = 0; 178 return dest; 179 } 180 181 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 182 Symbol* klass_name = klass->name(); 183 klass_name->as_klass_external_name(buf, size); 184 int len = (int)strlen(buf); 185 186 if (len < size - 1) { 187 buf[len++] = '.'; 188 189 method_name->as_C_string(&(buf[len]), size - len); 190 len = (int)strlen(buf); 191 192 signature->as_C_string(&(buf[len]), size - len); 193 } 194 195 return buf; 196 } 197 198 const char* Method::external_name() const { 199 return external_name(constants()->pool_holder(), name(), signature()); 200 } 201 202 void Method::print_external_name(outputStream *os) const { 203 print_external_name(os, constants()->pool_holder(), name(), signature()); 204 } 205 206 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) { 207 stringStream ss; 208 print_external_name(&ss, klass, method_name, signature); 209 return ss.as_string(); 210 } 211 212 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) { 213 signature->print_as_signature_external_return_type(os); 214 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string()); 215 signature->print_as_signature_external_parameters(os); 216 os->print(")"); 217 } 218 219 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) { 220 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 221 // access exception table 222 ExceptionTable table(mh()); 223 int length = table.length(); 224 // iterate through all entries sequentially 225 constantPoolHandle pool(THREAD, mh->constants()); 226 for (int i = 0; i < length; i ++) { 227 //reacquire the table in case a GC happened 228 ExceptionTable table(mh()); 229 int beg_bci = table.start_pc(i); 230 int end_bci = table.end_pc(i); 231 assert(beg_bci <= end_bci, "inconsistent exception table"); 232 if (beg_bci <= throw_bci && throw_bci < end_bci) { 233 // exception handler bci range covers throw_bci => investigate further 234 int handler_bci = table.handler_pc(i); 235 int klass_index = table.catch_type_index(i); 236 if (klass_index == 0) { 237 return handler_bci; 238 } else if (ex_klass == NULL) { 239 return handler_bci; 240 } else { 241 // we know the exception class => get the constraint class 242 // this may require loading of the constraint class; if verification 243 // fails or some other exception occurs, return handler_bci 244 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); 245 assert(k != NULL, "klass not loaded"); 246 if (ex_klass->is_subtype_of(k)) { 247 return handler_bci; 248 } 249 } 250 } 251 } 252 253 return -1; 254 } 255 256 void Method::mask_for(int bci, InterpreterOopMap* mask) { 257 methodHandle h_this(Thread::current(), this); 258 // Only GC uses the OopMapCache during thread stack root scanning 259 // any other uses generate an oopmap but do not save it in the cache. 260 if (Universe::heap()->is_gc_active()) { 261 method_holder()->mask_for(h_this, bci, mask); 262 } else { 263 OopMapCache::compute_one_oop_map(h_this, bci, mask); 264 } 265 return; 266 } 267 268 269 int Method::bci_from(address bcp) const { 270 if (is_native() && bcp == 0) { 271 return 0; 272 } 273 #ifdef ASSERT 274 { 275 ResourceMark rm; 276 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(), 277 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", 278 p2i(bcp), name_and_sig_as_C_string()); 279 } 280 #endif 281 return bcp - code_base(); 282 } 283 284 285 int Method::validate_bci(int bci) const { 286 return (bci == 0 || bci < code_size()) ? bci : -1; 287 } 288 289 // Return bci if it appears to be a valid bcp 290 // Return -1 otherwise. 291 // Used by profiling code, when invalid data is a possibility. 292 // The caller is responsible for validating the Method* itself. 293 int Method::validate_bci_from_bcp(address bcp) const { 294 // keep bci as -1 if not a valid bci 295 int bci = -1; 296 if (bcp == 0 || bcp == code_base()) { 297 // code_size() may return 0 and we allow 0 here 298 // the method may be native 299 bci = 0; 300 } else if (contains(bcp)) { 301 bci = bcp - code_base(); 302 } 303 // Assert that if we have dodged any asserts, bci is negative. 304 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 305 return bci; 306 } 307 308 address Method::bcp_from(int bci) const { 309 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), 310 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native"); 311 address bcp = code_base() + bci; 312 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 313 return bcp; 314 } 315 316 address Method::bcp_from(address bcp) const { 317 if (is_native() && bcp == NULL) { 318 return code_base(); 319 } else { 320 return bcp; 321 } 322 } 323 324 int Method::size(bool is_native) { 325 // If native, then include pointers for native_function and signature_handler 326 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 327 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord; 328 return align_metadata_size(header_size() + extra_words); 329 } 330 331 332 Symbol* Method::klass_name() const { 333 return method_holder()->name(); 334 } 335 336 337 void Method::metaspace_pointers_do(MetaspaceClosure* it) { 338 log_trace(cds)("Iter(Method): %p", this); 339 340 it->push(&_constMethod); 341 it->push(&_method_data); 342 it->push(&_method_counters); 343 } 344 345 // Attempt to return method oop to original state. Clear any pointers 346 // (to objects outside the shared spaces). We won't be able to predict 347 // where they should point in a new JVM. Further initialize some 348 // entries now in order allow them to be write protected later. 349 350 void Method::remove_unshareable_info() { 351 unlink_method(); 352 } 353 354 void Method::set_vtable_index(int index) { 355 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 356 // At runtime initialize_vtable is rerun as part of link_class_impl() 357 // for a shared class loaded by the non-boot loader to obtain the loader 358 // constraints based on the runtime classloaders' context. 359 return; // don't write into the shared class 360 } else { 361 _vtable_index = index; 362 } 363 } 364 365 void Method::set_itable_index(int index) { 366 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 367 // At runtime initialize_itable is rerun as part of link_class_impl() 368 // for a shared class loaded by the non-boot loader to obtain the loader 369 // constraints based on the runtime classloaders' context. The dumptime 370 // itable index should be the same as the runtime index. 371 assert(_vtable_index == itable_index_max - index, 372 "archived itable index is different from runtime index"); 373 return; // don’t write into the shared class 374 } else { 375 _vtable_index = itable_index_max - index; 376 } 377 assert(valid_itable_index(), ""); 378 } 379 380 381 382 bool Method::was_executed_more_than(int n) { 383 // Invocation counter is reset when the Method* is compiled. 384 // If the method has compiled code we therefore assume it has 385 // be excuted more than n times. 386 if (is_accessor() || is_empty_method() || (code() != NULL)) { 387 // interpreter doesn't bump invocation counter of trivial methods 388 // compiler does not bump invocation counter of compiled methods 389 return true; 390 } 391 else if ((method_counters() != NULL && 392 method_counters()->invocation_counter()->carry()) || 393 (method_data() != NULL && 394 method_data()->invocation_counter()->carry())) { 395 // The carry bit is set when the counter overflows and causes 396 // a compilation to occur. We don't know how many times 397 // the counter has been reset, so we simply assume it has 398 // been executed more than n times. 399 return true; 400 } else { 401 return invocation_count() > n; 402 } 403 } 404 405 void Method::print_invocation_count() { 406 if (is_static()) tty->print("static "); 407 if (is_final()) tty->print("final "); 408 if (is_synchronized()) tty->print("synchronized "); 409 if (is_native()) tty->print("native "); 410 tty->print("%s::", method_holder()->external_name()); 411 name()->print_symbol_on(tty); 412 signature()->print_symbol_on(tty); 413 414 if (WizardMode) { 415 // dump the size of the byte codes 416 tty->print(" {%d}", code_size()); 417 } 418 tty->cr(); 419 420 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 421 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 422 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 423 #ifndef PRODUCT 424 if (CountCompiledCalls) { 425 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 426 } 427 #endif 428 } 429 430 // Build a MethodData* object to hold information about this method 431 // collected in the interpreter. 432 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) { 433 // Do not profile the method if metaspace has hit an OOM previously 434 // allocating profiling data. Callers clear pending exception so don't 435 // add one here. 436 if (ClassLoaderDataGraph::has_metaspace_oom()) { 437 return; 438 } 439 440 // Grab a lock here to prevent multiple 441 // MethodData*s from being created. 442 MutexLocker ml(MethodData_lock, THREAD); 443 if (method->method_data() == NULL) { 444 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 445 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 446 if (HAS_PENDING_EXCEPTION) { 447 CompileBroker::log_metaspace_failure(); 448 ClassLoaderDataGraph::set_metaspace_oom(true); 449 return; // return the exception (which is cleared) 450 } 451 452 method->set_method_data(method_data); 453 if (PrintMethodData && (Verbose || WizardMode)) { 454 ResourceMark rm(THREAD); 455 tty->print("build_interpreter_method_data for "); 456 method->print_name(tty); 457 tty->cr(); 458 // At the end of the run, the MDO, full of data, will be dumped. 459 } 460 } 461 } 462 463 MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 464 // Do not profile the method if metaspace has hit an OOM previously 465 if (ClassLoaderDataGraph::has_metaspace_oom()) { 466 return NULL; 467 } 468 469 methodHandle mh(m); 470 MethodCounters* counters = MethodCounters::allocate(mh, THREAD); 471 if (HAS_PENDING_EXCEPTION) { 472 CompileBroker::log_metaspace_failure(); 473 ClassLoaderDataGraph::set_metaspace_oom(true); 474 return NULL; // return the exception (which is cleared) 475 } 476 if (!mh->init_method_counters(counters)) { 477 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 478 } 479 480 if (LogTouchedMethods) { 481 mh->log_touched(CHECK_NULL); 482 } 483 484 return mh->method_counters(); 485 } 486 487 bool Method::init_method_counters(MethodCounters* counters) { 488 // Try to install a pointer to MethodCounters, return true on success. 489 return Atomic::replace_if_null(counters, &_method_counters); 490 } 491 492 int Method::extra_stack_words() { 493 // not an inline function, to avoid a header dependency on Interpreter 494 return extra_stack_entries() * Interpreter::stackElementSize; 495 } 496 497 498 void Method::compute_size_of_parameters(Thread *thread) { 499 ArgumentSizeComputer asc(signature()); 500 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 501 } 502 503 BasicType Method::result_type() const { 504 ResultTypeFinder rtf(signature()); 505 return rtf.type(); 506 } 507 508 #ifdef ASSERT 509 // ValueKlass the method is declared to return. This must not 510 // safepoint as it is called with references live on the stack at 511 // locations the GC is unaware of. 512 ValueKlass* Method::returned_value_type(Thread* thread) const { 513 SignatureStream ss(signature()); 514 while (!ss.at_return_type()) { 515 ss.next(); 516 } 517 Handle class_loader(thread, method_holder()->class_loader()); 518 Handle protection_domain(thread, method_holder()->protection_domain()); 519 Klass* k = NULL; 520 { 521 NoSafepointVerifier nsv; 522 k = ss.as_klass(class_loader, protection_domain, SignatureStream::ReturnNull, thread); 523 } 524 assert(k != NULL && !thread->has_pending_exception(), "can't resolve klass"); 525 return ValueKlass::cast(k); 526 } 527 #endif 528 529 bool Method::is_empty_method() const { 530 return code_size() == 1 531 && *code_base() == Bytecodes::_return; 532 } 533 534 535 bool Method::is_vanilla_constructor() const { 536 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 537 // which only calls the superclass vanilla constructor and possibly does stores of 538 // zero constants to local fields: 539 // 540 // aload_0 541 // invokespecial 542 // indexbyte1 543 // indexbyte2 544 // 545 // followed by an (optional) sequence of: 546 // 547 // aload_0 548 // aconst_null / iconst_0 / fconst_0 / dconst_0 549 // putfield 550 // indexbyte1 551 // indexbyte2 552 // 553 // followed by: 554 // 555 // return 556 557 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 558 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 559 int size = code_size(); 560 // Check if size match 561 if (size == 0 || size % 5 != 0) return false; 562 address cb = code_base(); 563 int last = size - 1; 564 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 565 // Does not call superclass default constructor 566 return false; 567 } 568 // Check optional sequence 569 for (int i = 4; i < last; i += 5) { 570 if (cb[i] != Bytecodes::_aload_0) return false; 571 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 572 if (cb[i+2] != Bytecodes::_putfield) return false; 573 } 574 return true; 575 } 576 577 578 bool Method::compute_has_loops_flag() { 579 BytecodeStream bcs(this); 580 Bytecodes::Code bc; 581 582 while ((bc = bcs.next()) >= 0) { 583 switch( bc ) { 584 case Bytecodes::_ifeq: 585 case Bytecodes::_ifnull: 586 case Bytecodes::_iflt: 587 case Bytecodes::_ifle: 588 case Bytecodes::_ifne: 589 case Bytecodes::_ifnonnull: 590 case Bytecodes::_ifgt: 591 case Bytecodes::_ifge: 592 case Bytecodes::_if_icmpeq: 593 case Bytecodes::_if_icmpne: 594 case Bytecodes::_if_icmplt: 595 case Bytecodes::_if_icmpgt: 596 case Bytecodes::_if_icmple: 597 case Bytecodes::_if_icmpge: 598 case Bytecodes::_if_acmpeq: 599 case Bytecodes::_if_acmpne: 600 case Bytecodes::_goto: 601 case Bytecodes::_jsr: 602 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 603 break; 604 605 case Bytecodes::_goto_w: 606 case Bytecodes::_jsr_w: 607 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 608 break; 609 610 default: 611 break; 612 } 613 } 614 _access_flags.set_loops_flag_init(); 615 return _access_flags.has_loops(); 616 } 617 618 bool Method::is_final_method(AccessFlags class_access_flags) const { 619 // or "does_not_require_vtable_entry" 620 // default method or overpass can occur, is not final (reuses vtable entry) 621 // private methods in classes get vtable entries for backward class compatibility. 622 if (is_overpass() || is_default_method()) return false; 623 return is_final() || class_access_flags.is_final(); 624 } 625 626 bool Method::is_final_method() const { 627 return is_final_method(method_holder()->access_flags()); 628 } 629 630 bool Method::is_default_method() const { 631 if (method_holder() != NULL && 632 method_holder()->is_interface() && 633 !is_abstract() && !is_private()) { 634 return true; 635 } else { 636 return false; 637 } 638 } 639 640 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 641 if (is_final_method(class_access_flags)) return true; 642 #ifdef ASSERT 643 ResourceMark rm; 644 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 645 if (class_access_flags.is_interface()) { 646 assert(is_nonv == is_static() || is_nonv == is_private(), 647 "nonvirtual unexpected for non-static, non-private: %s", 648 name_and_sig_as_C_string()); 649 } 650 #endif 651 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 652 return vtable_index() == nonvirtual_vtable_index; 653 } 654 655 bool Method::can_be_statically_bound() const { 656 return can_be_statically_bound(method_holder()->access_flags()); 657 } 658 659 bool Method::can_be_statically_bound(InstanceKlass* context) const { 660 return (method_holder() == context) && can_be_statically_bound(); 661 } 662 663 bool Method::is_accessor() const { 664 return is_getter() || is_setter(); 665 } 666 667 bool Method::is_getter() const { 668 if (code_size() != 5) return false; 669 if (size_of_parameters() != 1) return false; 670 if (java_code_at(0) != Bytecodes::_aload_0) return false; 671 if (java_code_at(1) != Bytecodes::_getfield) return false; 672 switch (java_code_at(4)) { 673 case Bytecodes::_ireturn: 674 case Bytecodes::_lreturn: 675 case Bytecodes::_freturn: 676 case Bytecodes::_dreturn: 677 case Bytecodes::_areturn: 678 break; 679 default: 680 return false; 681 } 682 return true; 683 } 684 685 bool Method::is_setter() const { 686 if (code_size() != 6) return false; 687 if (java_code_at(0) != Bytecodes::_aload_0) return false; 688 switch (java_code_at(1)) { 689 case Bytecodes::_iload_1: 690 case Bytecodes::_aload_1: 691 case Bytecodes::_fload_1: 692 if (size_of_parameters() != 2) return false; 693 break; 694 case Bytecodes::_dload_1: 695 case Bytecodes::_lload_1: 696 if (size_of_parameters() != 3) return false; 697 break; 698 default: 699 return false; 700 } 701 if (java_code_at(2) != Bytecodes::_putfield) return false; 702 if (java_code_at(5) != Bytecodes::_return) return false; 703 return true; 704 } 705 706 bool Method::is_constant_getter() const { 707 int last_index = code_size() - 1; 708 // Check if the first 1-3 bytecodes are a constant push 709 // and the last bytecode is a return. 710 return (2 <= code_size() && code_size() <= 4 && 711 Bytecodes::is_const(java_code_at(0)) && 712 Bytecodes::length_for(java_code_at(0)) == last_index && 713 Bytecodes::is_return(java_code_at(last_index))); 714 } 715 716 bool Method::is_object_constructor_or_class_initializer() const { 717 return (is_object_constructor() || is_class_initializer()); 718 } 719 720 bool Method::is_class_initializer() const { 721 // For classfiles version 51 or greater, ensure that the clinit method is 722 // static. Non-static methods with the name "<clinit>" are not static 723 // initializers. (older classfiles exempted for backward compatibility) 724 return (name() == vmSymbols::class_initializer_name() && 725 (is_static() || 726 method_holder()->major_version() < 51)); 727 } 728 729 // A method named <init>, if non-static, is a classic object constructor. 730 bool Method::is_object_constructor() const { 731 return name() == vmSymbols::object_initializer_name() && !is_static(); 732 } 733 734 // A static method named <init> is a factory for an inline class. 735 bool Method::is_static_init_factory() const { 736 return name() == vmSymbols::object_initializer_name() && is_static(); 737 } 738 739 bool Method::needs_clinit_barrier() const { 740 return is_static() && !method_holder()->is_initialized(); 741 } 742 743 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 744 int length = method->checked_exceptions_length(); 745 if (length == 0) { // common case 746 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 747 } else { 748 methodHandle h_this(THREAD, method); 749 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 750 objArrayHandle mirrors (THREAD, m_oop); 751 for (int i = 0; i < length; i++) { 752 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 753 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 754 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 755 mirrors->obj_at_put(i, k->java_mirror()); 756 } 757 return mirrors; 758 } 759 }; 760 761 762 int Method::line_number_from_bci(int bci) const { 763 int best_bci = 0; 764 int best_line = -1; 765 if (bci == SynchronizationEntryBCI) bci = 0; 766 if (0 <= bci && bci < code_size() && has_linenumber_table()) { 767 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 768 // Not necessarily sorted and not necessarily one-to-one. 769 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 770 while (stream.read_pair()) { 771 if (stream.bci() == bci) { 772 // perfect match 773 return stream.line(); 774 } else { 775 // update best_bci/line 776 if (stream.bci() < bci && stream.bci() >= best_bci) { 777 best_bci = stream.bci(); 778 best_line = stream.line(); 779 } 780 } 781 } 782 } 783 return best_line; 784 } 785 786 787 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 788 if( constants()->tag_at(klass_index).is_unresolved_klass()) { 789 Thread *thread = Thread::current(); 790 Symbol* klass_name = constants()->klass_name_at(klass_index); 791 Handle loader(thread, method_holder()->class_loader()); 792 Handle prot (thread, method_holder()->protection_domain()); 793 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 794 } else { 795 return true; 796 } 797 } 798 799 800 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 801 int klass_index = constants()->klass_ref_index_at(refinfo_index); 802 if (must_be_resolved) { 803 // Make sure klass is resolved in constantpool. 804 if (constants()->tag_at(klass_index).is_unresolved_klass()) { 805 return false; 806 } 807 } 808 return is_klass_loaded_by_klass_index(klass_index); 809 } 810 811 812 void Method::set_native_function(address function, bool post_event_flag) { 813 assert(function != NULL, "use clear_native_function to unregister natives"); 814 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 815 address* native_function = native_function_addr(); 816 817 // We can see racers trying to place the same native function into place. Once 818 // is plenty. 819 address current = *native_function; 820 if (current == function) return; 821 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 822 function != NULL) { 823 // native_method_throw_unsatisfied_link_error_entry() should only 824 // be passed when post_event_flag is false. 825 assert(function != 826 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 827 "post_event_flag mis-match"); 828 829 // post the bind event, and possible change the bind function 830 JvmtiExport::post_native_method_bind(this, &function); 831 } 832 *native_function = function; 833 // This function can be called more than once. We must make sure that we always 834 // use the latest registered method -> check if a stub already has been generated. 835 // If so, we have to make it not_entrant. 836 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates 837 if (nm != NULL) { 838 nm->make_not_entrant(); 839 } 840 } 841 842 843 bool Method::has_native_function() const { 844 if (is_method_handle_intrinsic()) 845 return false; // special-cased in SharedRuntime::generate_native_wrapper 846 address func = native_function(); 847 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 848 } 849 850 851 void Method::clear_native_function() { 852 // Note: is_method_handle_intrinsic() is allowed here. 853 set_native_function( 854 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 855 !native_bind_event_is_interesting); 856 this->unlink_code(); 857 } 858 859 address Method::critical_native_function() { 860 methodHandle mh(this); 861 return NativeLookup::lookup_critical_entry(mh); 862 } 863 864 865 void Method::set_signature_handler(address handler) { 866 address* signature_handler = signature_handler_addr(); 867 *signature_handler = handler; 868 } 869 870 871 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 872 assert(reason != NULL, "must provide a reason"); 873 if (PrintCompilation && report) { 874 ttyLocker ttyl; 875 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 876 if (comp_level == CompLevel_all) { 877 tty->print("all levels "); 878 } else { 879 tty->print("levels "); 880 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 881 tty->print("%d ", i); 882 } 883 } 884 this->print_short_name(tty); 885 int size = this->code_size(); 886 if (size > 0) { 887 tty->print(" (%d bytes)", size); 888 } 889 if (reason != NULL) { 890 tty->print(" %s", reason); 891 } 892 tty->cr(); 893 } 894 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 895 ttyLocker ttyl; 896 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 897 os::current_thread_id(), is_osr, comp_level); 898 if (reason != NULL) { 899 xtty->print(" reason=\'%s\'", reason); 900 } 901 xtty->method(this); 902 xtty->stamp(); 903 xtty->end_elem(); 904 } 905 } 906 907 bool Method::is_always_compilable() const { 908 // Generated adapters must be compiled 909 if (is_method_handle_intrinsic() && is_synthetic()) { 910 assert(!is_not_c1_compilable(), "sanity check"); 911 assert(!is_not_c2_compilable(), "sanity check"); 912 return true; 913 } 914 915 return false; 916 } 917 918 bool Method::is_not_compilable(int comp_level) const { 919 if (number_of_breakpoints() > 0) 920 return true; 921 if (is_always_compilable()) 922 return false; 923 if (comp_level == CompLevel_any) 924 return is_not_c1_compilable() || is_not_c2_compilable(); 925 if (is_c1_compile(comp_level)) 926 return is_not_c1_compilable(); 927 if (is_c2_compile(comp_level)) 928 return is_not_c2_compilable(); 929 return false; 930 } 931 932 // call this when compiler finds that this method is not compilable 933 void Method::set_not_compilable(const char* reason, int comp_level, bool report) { 934 if (is_always_compilable()) { 935 // Don't mark a method which should be always compilable 936 return; 937 } 938 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 939 if (comp_level == CompLevel_all) { 940 set_not_c1_compilable(); 941 set_not_c2_compilable(); 942 } else { 943 if (is_c1_compile(comp_level)) 944 set_not_c1_compilable(); 945 if (is_c2_compile(comp_level)) 946 set_not_c2_compilable(); 947 } 948 CompilationPolicy::policy()->disable_compilation(this); 949 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 950 } 951 952 bool Method::is_not_osr_compilable(int comp_level) const { 953 if (is_not_compilable(comp_level)) 954 return true; 955 if (comp_level == CompLevel_any) 956 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 957 if (is_c1_compile(comp_level)) 958 return is_not_c1_osr_compilable(); 959 if (is_c2_compile(comp_level)) 960 return is_not_c2_osr_compilable(); 961 return false; 962 } 963 964 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) { 965 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 966 if (comp_level == CompLevel_all) { 967 set_not_c1_osr_compilable(); 968 set_not_c2_osr_compilable(); 969 } else { 970 if (is_c1_compile(comp_level)) 971 set_not_c1_osr_compilable(); 972 if (is_c2_compile(comp_level)) 973 set_not_c2_osr_compilable(); 974 } 975 CompilationPolicy::policy()->disable_compilation(this); 976 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 977 } 978 979 // Revert to using the interpreter and clear out the nmethod 980 void Method::clear_code() { 981 // this may be NULL if c2i adapters have not been made yet 982 // Only should happen at allocate time. 983 if (adapter() == NULL) { 984 _from_compiled_entry = NULL; 985 _from_compiled_value_entry = NULL; 986 _from_compiled_value_ro_entry = NULL; 987 } else { 988 _from_compiled_entry = adapter()->get_c2i_entry(); 989 _from_compiled_value_entry = adapter()->get_c2i_value_entry(); 990 _from_compiled_value_ro_entry = adapter()->get_c2i_value_ro_entry(); 991 } 992 OrderAccess::storestore(); 993 _from_interpreted_entry = _i2i_entry; 994 OrderAccess::storestore(); 995 _code = NULL; 996 } 997 998 void Method::unlink_code(CompiledMethod *compare) { 999 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 1000 // We need to check if either the _code or _from_compiled_code_entry_point 1001 // refer to this nmethod because there is a race in setting these two fields 1002 // in Method* as seen in bugid 4947125. 1003 // If the vep() points to the zombie nmethod, the memory for the nmethod 1004 // could be flushed and the compiler and vtable stubs could still call 1005 // through it. 1006 if (code() == compare || 1007 from_compiled_entry() == compare->verified_entry_point()) { 1008 clear_code(); 1009 } 1010 } 1011 1012 void Method::unlink_code() { 1013 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 1014 clear_code(); 1015 } 1016 1017 #if INCLUDE_CDS 1018 // Called by class data sharing to remove any entry points (which are not shared) 1019 void Method::unlink_method() { 1020 _code = NULL; 1021 1022 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "dump time only"); 1023 // Set the values to what they should be at run time. Note that 1024 // this Method can no longer be executed during dump time. 1025 _i2i_entry = Interpreter::entry_for_cds_method(this); 1026 _from_interpreted_entry = _i2i_entry; 1027 1028 if (DynamicDumpSharedSpaces) { 1029 assert(_from_compiled_entry != NULL, "sanity"); 1030 } else { 1031 // TODO: Simplify the adapter trampoline allocation for static archiving. 1032 // Remove the use of CDSAdapterHandlerEntry. 1033 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter(); 1034 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline()); 1035 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline(); 1036 assert(*((int*)_from_compiled_entry) == 0, 1037 "must be NULL during dump time, to be initialized at run time"); 1038 _from_compiled_value_ro_entry = cds_adapter->get_c2i_entry_trampoline(); // FIXME - doesn't work if you have value args! 1039 assert(*((int*)_from_compiled_value_ro_entry) == 0, 1040 "must be NULL during dump time, to be initialized at run time"); 1041 _from_compiled_value_entry = cds_adapter->get_c2i_entry_trampoline(); // FIXME - doesn't work if you have value args (or this is value type)! 1042 assert(*((int*)_from_compiled_value_entry) == 0, 1043 "must be NULL during dump time, to be initialized at run time"); 1044 assert(!method_holder()->is_value(), "FIXME: valuetype not supported by CDS"); 1045 } 1046 1047 if (is_native()) { 1048 *native_function_addr() = NULL; 1049 set_signature_handler(NULL); 1050 } 1051 NOT_PRODUCT(set_compiled_invocation_count(0);) 1052 1053 set_method_data(NULL); 1054 clear_method_counters(); 1055 } 1056 #endif 1057 1058 /**************************************************************************** 1059 // The following illustrates how the entries work for CDS shared Methods: 1060 // 1061 // Our goal is to delay writing into a shared Method until it's compiled. 1062 // Hence, we want to determine the initial values for _i2i_entry, 1063 // _from_interpreted_entry and _from_compiled_entry during CDS dump time. 1064 // 1065 // In this example, both Methods A and B have the _i2i_entry of "zero_locals". 1066 // They also have similar signatures so that they will share the same 1067 // AdapterHandlerEntry. 1068 // 1069 // _adapter_trampoline points to a fixed location in the RW section of 1070 // the CDS archive. This location initially contains a NULL pointer. When the 1071 // first of method A or B is linked, an AdapterHandlerEntry is allocated 1072 // dynamically, and its c2i/i2c entries are generated. 1073 // 1074 // _i2i_entry and _from_interpreted_entry initially points to the same 1075 // (fixed) location in the CODE section of the CDS archive. This contains 1076 // an unconditional branch to the actual entry for "zero_locals", which is 1077 // generated at run time and may be on an arbitrary address. Thus, the 1078 // unconditional branch is also generated at run time to jump to the correct 1079 // address. 1080 // 1081 // Similarly, _from_compiled_entry points to a fixed address in the CODE 1082 // section. This address has enough space for an unconditional branch 1083 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is 1084 // initialized, and the address for the actual c2i_entry is known, we emit a 1085 // branch instruction here to branch to the actual c2i_entry. 1086 // 1087 // The effect of the extra branch on the i2i and c2i entries is negligible. 1088 // 1089 // The reason for putting _adapter_trampoline in RO is many shared Methods 1090 // share the same AdapterHandlerEntry, so we can save space in the RW section 1091 // by having the extra indirection. 1092 1093 1094 [Method A: RW] 1095 _constMethod ----> [ConstMethod: RO] 1096 _adapter_trampoline -----------+ 1097 | 1098 _i2i_entry (same value as method B) | 1099 _from_interpreted_entry (same value as method B) | 1100 _from_compiled_entry (same value as method B) | 1101 | 1102 | 1103 [Method B: RW] +--------+ 1104 _constMethod ----> [ConstMethod: RO] | 1105 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+ 1106 | 1107 +-------------------------------+ 1108 | 1109 +----> [AdapterHandlerEntry] (allocated at run time) 1110 _fingerprint 1111 _c2i_entry ---------------------------------+->[c2i entry..] 1112 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] | 1113 _from_interpreted_entry | _c2i_unverified_entry | | 1114 | | | | 1115 | | (_cds_entry_table: CODE) | | 1116 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | | 1117 | | (allocated at run time) | | 1118 | | ... [asm code ...] | | 1119 +-[not compiled]-+ [n]: jmp _entry_table[n] | | 1120 | | | 1121 | | | 1122 +-[compiled]-------------------------------------------------------------------+ | 1123 | 1124 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) | 1125 [jmp c2i_entry] ------------------------------------------------------+ 1126 1127 ***/ 1128 1129 // Called when the method_holder is getting linked. Setup entrypoints so the method 1130 // is ready to be called from interpreter, compiler, and vtables. 1131 void Method::link_method(const methodHandle& h_method, TRAPS) { 1132 // If the code cache is full, we may reenter this function for the 1133 // leftover methods that weren't linked. 1134 if (is_shared()) { 1135 address entry = Interpreter::entry_for_cds_method(h_method); 1136 assert(entry != NULL && entry == _i2i_entry, 1137 "should be correctly set during dump time"); 1138 if (adapter() != NULL) { 1139 return; 1140 } 1141 assert(entry == _from_interpreted_entry, 1142 "should be correctly set during dump time"); 1143 } else if (_i2i_entry != NULL) { 1144 return; 1145 } 1146 assert( _code == NULL, "nothing compiled yet" ); 1147 1148 // Setup interpreter entrypoint 1149 assert(this == h_method(), "wrong h_method()" ); 1150 1151 if (!is_shared()) { 1152 assert(adapter() == NULL, "init'd to NULL"); 1153 address entry = Interpreter::entry_for_method(h_method); 1154 assert(entry != NULL, "interpreter entry must be non-null"); 1155 // Sets both _i2i_entry and _from_interpreted_entry 1156 set_interpreter_entry(entry); 1157 } 1158 1159 // Don't overwrite already registered native entries. 1160 if (is_native() && !has_native_function()) { 1161 set_native_function( 1162 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1163 !native_bind_event_is_interesting); 1164 } 1165 1166 // Setup compiler entrypoint. This is made eagerly, so we do not need 1167 // special handling of vtables. An alternative is to make adapters more 1168 // lazily by calling make_adapter() from from_compiled_entry() for the 1169 // normal calls. For vtable calls life gets more complicated. When a 1170 // call-site goes mega-morphic we need adapters in all methods which can be 1171 // called from the vtable. We need adapters on such methods that get loaded 1172 // later. Ditto for mega-morphic itable calls. If this proves to be a 1173 // problem we'll make these lazily later. 1174 (void) make_adapters(h_method, CHECK); 1175 1176 // ONLY USE the h_method now as make_adapter may have blocked 1177 1178 } 1179 1180 address Method::make_adapters(const methodHandle& mh, TRAPS) { 1181 // Adapters for compiled code are made eagerly here. They are fairly 1182 // small (generally < 100 bytes) and quick to make (and cached and shared) 1183 // so making them eagerly shouldn't be too expensive. 1184 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1185 if (adapter == NULL ) { 1186 if (!is_init_completed()) { 1187 // Don't throw exceptions during VM initialization because java.lang.* classes 1188 // might not have been initialized, causing problems when constructing the 1189 // Java exception object. 1190 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1191 } else { 1192 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters"); 1193 } 1194 } 1195 1196 if (mh->is_shared()) { 1197 assert(mh->adapter() == adapter, "must be"); 1198 assert(mh->_from_compiled_entry != NULL, "must be"); 1199 assert(mh->_from_compiled_value_entry != NULL, "must be"); 1200 assert(mh->_from_compiled_value_ro_entry != NULL, "must be"); 1201 } else { 1202 mh->set_adapter_entry(adapter); 1203 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1204 mh->_from_compiled_value_entry = adapter->get_c2i_value_entry(); 1205 mh->_from_compiled_value_ro_entry = adapter->get_c2i_value_ro_entry(); 1206 } 1207 return adapter->get_c2i_entry(); 1208 } 1209 1210 void Method::restore_unshareable_info(TRAPS) { 1211 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored"); 1212 1213 // Since restore_unshareable_info can be called more than once for a method, don't 1214 // redo any work. 1215 if (adapter() == NULL) { 1216 methodHandle mh(THREAD, this); 1217 link_method(mh, CHECK); 1218 } 1219 } 1220 1221 address Method::from_compiled_entry_no_trampoline(bool caller_is_c1) const { 1222 CompiledMethod *code = OrderAccess::load_acquire(&_code); 1223 if (caller_is_c1) { 1224 // C1 - value arguments are passed as objects 1225 if (code) { 1226 return code->verified_value_entry_point(); 1227 } else { 1228 return adapter()->get_c2i_value_entry(); 1229 } 1230 } else { 1231 // C2 - value arguments may be passed as fields 1232 if (code) { 1233 return code->verified_entry_point(); 1234 } else { 1235 return adapter()->get_c2i_entry(); 1236 } 1237 } 1238 } 1239 1240 // The verified_code_entry() must be called when a invoke is resolved 1241 // on this method. 1242 1243 // It returns the compiled code entry point, after asserting not null. 1244 // This function is called after potential safepoints so that nmethod 1245 // or adapter that it points to is still live and valid. 1246 // This function must not hit a safepoint! 1247 address Method::verified_code_entry() { 1248 debug_only(NoSafepointVerifier nsv;) 1249 assert(_from_compiled_entry != NULL, "must be set"); 1250 return _from_compiled_entry; 1251 } 1252 1253 address Method::verified_value_code_entry() { 1254 debug_only(NoSafepointVerifier nsv;) 1255 assert(_from_compiled_value_entry != NULL, "must be set"); 1256 return _from_compiled_value_entry; 1257 } 1258 1259 address Method::verified_value_ro_code_entry() { 1260 debug_only(NoSafepointVerifier nsv;) 1261 assert(_from_compiled_value_ro_entry != NULL, "must be set"); 1262 return _from_compiled_value_ro_entry; 1263 } 1264 1265 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1266 // (could be racing a deopt). 1267 // Not inline to avoid circular ref. 1268 bool Method::check_code() const { 1269 // cached in a register or local. There's a race on the value of the field. 1270 CompiledMethod *code = OrderAccess::load_acquire(&_code); 1271 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 1272 } 1273 1274 // Install compiled code. Instantly it can execute. 1275 void Method::set_code(const methodHandle& mh, CompiledMethod *code) { 1276 MutexLocker pl(CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 1277 assert( code, "use clear_code to remove code" ); 1278 assert( mh->check_code(), "" ); 1279 1280 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 1281 1282 // These writes must happen in this order, because the interpreter will 1283 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1284 // which jumps to _from_compiled_entry. 1285 mh->_code = code; // Assign before allowing compiled code to exec 1286 1287 int comp_level = code->comp_level(); 1288 // In theory there could be a race here. In practice it is unlikely 1289 // and not worth worrying about. 1290 if (comp_level > mh->highest_comp_level()) { 1291 mh->set_highest_comp_level(comp_level); 1292 } 1293 1294 OrderAccess::storestore(); 1295 mh->_from_compiled_entry = code->verified_entry_point(); 1296 mh->_from_compiled_value_entry = code->verified_value_entry_point(); 1297 mh->_from_compiled_value_ro_entry = code->verified_value_ro_entry_point(); 1298 OrderAccess::storestore(); 1299 // Instantly compiled code can execute. 1300 if (!mh->is_method_handle_intrinsic()) 1301 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1302 } 1303 1304 1305 bool Method::is_overridden_in(Klass* k) const { 1306 InstanceKlass* ik = InstanceKlass::cast(k); 1307 1308 if (ik->is_interface()) return false; 1309 1310 // If method is an interface, we skip it - except if it 1311 // is a miranda method 1312 if (method_holder()->is_interface()) { 1313 // Check that method is not a miranda method 1314 if (ik->lookup_method(name(), signature()) == NULL) { 1315 // No implementation exist - so miranda method 1316 return false; 1317 } 1318 return true; 1319 } 1320 1321 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1322 if (!has_vtable_index()) { 1323 return false; 1324 } else { 1325 Method* vt_m = ik->method_at_vtable(vtable_index()); 1326 return vt_m != this; 1327 } 1328 } 1329 1330 1331 // give advice about whether this Method* should be cached or not 1332 bool Method::should_not_be_cached() const { 1333 if (is_old()) { 1334 // This method has been redefined. It is either EMCP or obsolete 1335 // and we don't want to cache it because that would pin the method 1336 // down and prevent it from being collectible if and when it 1337 // finishes executing. 1338 return true; 1339 } 1340 1341 // caching this method should be just fine 1342 return false; 1343 } 1344 1345 1346 /** 1347 * Returns true if this is one of the specially treated methods for 1348 * security related stack walks (like Reflection.getCallerClass). 1349 */ 1350 bool Method::is_ignored_by_security_stack_walk() const { 1351 if (intrinsic_id() == vmIntrinsics::_invoke) { 1352 // This is Method.invoke() -- ignore it 1353 return true; 1354 } 1355 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1356 // This is an auxilary frame -- ignore it 1357 return true; 1358 } 1359 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1360 // This is an internal adapter frame for method handles -- ignore it 1361 return true; 1362 } 1363 return false; 1364 } 1365 1366 1367 // Constant pool structure for invoke methods: 1368 enum { 1369 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1370 _imcp_invoke_signature, // utf8: (variable Symbol*) 1371 _imcp_limit 1372 }; 1373 1374 // Test if this method is an MH adapter frame generated by Java code. 1375 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1376 bool Method::is_compiled_lambda_form() const { 1377 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1378 } 1379 1380 // Test if this method is an internal MH primitive method. 1381 bool Method::is_method_handle_intrinsic() const { 1382 vmIntrinsics::ID iid = intrinsic_id(); 1383 return (MethodHandles::is_signature_polymorphic(iid) && 1384 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1385 } 1386 1387 bool Method::has_member_arg() const { 1388 vmIntrinsics::ID iid = intrinsic_id(); 1389 return (MethodHandles::is_signature_polymorphic(iid) && 1390 MethodHandles::has_member_arg(iid)); 1391 } 1392 1393 // Make an instance of a signature-polymorphic internal MH primitive. 1394 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1395 Symbol* signature, 1396 TRAPS) { 1397 ResourceMark rm; 1398 methodHandle empty; 1399 1400 InstanceKlass* holder = SystemDictionary::MethodHandle_klass(); 1401 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1402 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1403 if (TraceMethodHandles) { 1404 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1405 } 1406 1407 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1408 name->increment_refcount(); 1409 signature->increment_refcount(); 1410 1411 int cp_length = _imcp_limit; 1412 ClassLoaderData* loader_data = holder->class_loader_data(); 1413 constantPoolHandle cp; 1414 { 1415 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1416 cp = constantPoolHandle(THREAD, cp_oop); 1417 } 1418 cp->set_pool_holder(holder); 1419 cp->symbol_at_put(_imcp_invoke_name, name); 1420 cp->symbol_at_put(_imcp_invoke_signature, signature); 1421 cp->set_has_preresolution(); 1422 1423 // decide on access bits: public or not? 1424 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1425 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1426 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1427 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1428 1429 methodHandle m; 1430 { 1431 InlineTableSizes sizes; 1432 Method* m_oop = Method::allocate(loader_data, 0, 1433 accessFlags_from(flags_bits), &sizes, 1434 ConstMethod::NORMAL, CHECK_(empty)); 1435 m = methodHandle(THREAD, m_oop); 1436 } 1437 m->set_constants(cp()); 1438 m->set_name_index(_imcp_invoke_name); 1439 m->set_signature_index(_imcp_invoke_signature); 1440 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1441 assert(m->signature() == signature, ""); 1442 ResultTypeFinder rtf(signature); 1443 m->constMethod()->set_result_type(rtf.type()); 1444 m->compute_size_of_parameters(THREAD); 1445 m->init_intrinsic_id(); 1446 assert(m->is_method_handle_intrinsic(), ""); 1447 #ifdef ASSERT 1448 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1449 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1450 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1451 #endif //ASSERT 1452 1453 // Finally, set up its entry points. 1454 assert(m->can_be_statically_bound(), ""); 1455 m->set_vtable_index(Method::nonvirtual_vtable_index); 1456 m->link_method(m, CHECK_(empty)); 1457 1458 if (TraceMethodHandles && (Verbose || WizardMode)) { 1459 ttyLocker ttyl; 1460 m->print_on(tty); 1461 } 1462 1463 return m; 1464 } 1465 1466 Klass* Method::check_non_bcp_klass(Klass* klass) { 1467 if (klass != NULL && klass->class_loader() != NULL) { 1468 if (klass->is_objArray_klass()) 1469 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1470 return klass; 1471 } 1472 return NULL; 1473 } 1474 1475 1476 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, 1477 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1478 // Code below does not work for native methods - they should never get rewritten anyway 1479 assert(!m->is_native(), "cannot rewrite native methods"); 1480 // Allocate new Method* 1481 AccessFlags flags = m->access_flags(); 1482 1483 ConstMethod* cm = m->constMethod(); 1484 int checked_exceptions_len = cm->checked_exceptions_length(); 1485 int localvariable_len = cm->localvariable_table_length(); 1486 int exception_table_len = cm->exception_table_length(); 1487 int method_parameters_len = cm->method_parameters_length(); 1488 int method_annotations_len = cm->method_annotations_length(); 1489 int parameter_annotations_len = cm->parameter_annotations_length(); 1490 int type_annotations_len = cm->type_annotations_length(); 1491 int default_annotations_len = cm->default_annotations_length(); 1492 1493 InlineTableSizes sizes( 1494 localvariable_len, 1495 new_compressed_linenumber_size, 1496 exception_table_len, 1497 checked_exceptions_len, 1498 method_parameters_len, 1499 cm->generic_signature_index(), 1500 method_annotations_len, 1501 parameter_annotations_len, 1502 type_annotations_len, 1503 default_annotations_len, 1504 0); 1505 1506 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1507 Method* newm_oop = Method::allocate(loader_data, 1508 new_code_length, 1509 flags, 1510 &sizes, 1511 m->method_type(), 1512 CHECK_(methodHandle())); 1513 methodHandle newm (THREAD, newm_oop); 1514 1515 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1516 ConstMethod* newcm = newm->constMethod(); 1517 int new_const_method_size = newm->constMethod()->size(); 1518 1519 // This works because the source and target are both Methods. Some compilers 1520 // (e.g., clang) complain that the target vtable pointer will be stomped, 1521 // so cast away newm()'s and m()'s Methodness. 1522 memcpy((void*)newm(), (void*)m(), sizeof(Method)); 1523 1524 // Create shallow copy of ConstMethod. 1525 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1526 1527 // Reset correct method/const method, method size, and parameter info 1528 newm->set_constMethod(newcm); 1529 newm->constMethod()->set_code_size(new_code_length); 1530 newm->constMethod()->set_constMethod_size(new_const_method_size); 1531 assert(newm->code_size() == new_code_length, "check"); 1532 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1533 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1534 assert(newm->exception_table_length() == exception_table_len, "check"); 1535 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1536 // Copy new byte codes 1537 memcpy(newm->code_base(), new_code, new_code_length); 1538 // Copy line number table 1539 if (new_compressed_linenumber_size > 0) { 1540 memcpy(newm->compressed_linenumber_table(), 1541 new_compressed_linenumber_table, 1542 new_compressed_linenumber_size); 1543 } 1544 // Copy method_parameters 1545 if (method_parameters_len > 0) { 1546 memcpy(newm->method_parameters_start(), 1547 m->method_parameters_start(), 1548 method_parameters_len * sizeof(MethodParametersElement)); 1549 } 1550 // Copy checked_exceptions 1551 if (checked_exceptions_len > 0) { 1552 memcpy(newm->checked_exceptions_start(), 1553 m->checked_exceptions_start(), 1554 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1555 } 1556 // Copy exception table 1557 if (exception_table_len > 0) { 1558 memcpy(newm->exception_table_start(), 1559 m->exception_table_start(), 1560 exception_table_len * sizeof(ExceptionTableElement)); 1561 } 1562 // Copy local variable number table 1563 if (localvariable_len > 0) { 1564 memcpy(newm->localvariable_table_start(), 1565 m->localvariable_table_start(), 1566 localvariable_len * sizeof(LocalVariableTableElement)); 1567 } 1568 // Copy stackmap table 1569 if (m->has_stackmap_table()) { 1570 int code_attribute_length = m->stackmap_data()->length(); 1571 Array<u1>* stackmap_data = 1572 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1573 memcpy((void*)stackmap_data->adr_at(0), 1574 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1575 newm->set_stackmap_data(stackmap_data); 1576 } 1577 1578 // copy annotations over to new method 1579 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL); 1580 return newm; 1581 } 1582 1583 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) { 1584 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1585 // because we are not loading from core libraries 1586 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1587 // which does not use the class default class loader so we check for its loader here 1588 const InstanceKlass* ik = InstanceKlass::cast(holder); 1589 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1590 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1591 } 1592 1593 // see if the klass name is well-known: 1594 Symbol* klass_name = ik->name(); 1595 return vmSymbols::find_sid(klass_name); 1596 } 1597 1598 void Method::init_intrinsic_id() { 1599 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1600 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1601 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1602 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1603 1604 // the klass name is well-known: 1605 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1606 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1607 1608 // ditto for method and signature: 1609 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1610 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1611 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1612 && name_id == vmSymbols::NO_SID) { 1613 return; 1614 } 1615 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1616 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1617 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1618 && sig_id == vmSymbols::NO_SID) { 1619 return; 1620 } 1621 jshort flags = access_flags().as_short(); 1622 1623 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1624 if (id != vmIntrinsics::_none) { 1625 set_intrinsic_id(id); 1626 if (id == vmIntrinsics::_Class_cast) { 1627 // Even if the intrinsic is rejected, we want to inline this simple method. 1628 set_force_inline(true); 1629 } 1630 return; 1631 } 1632 1633 // A few slightly irregular cases: 1634 switch (klass_id) { 1635 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1636 // Second chance: check in regular Math. 1637 switch (name_id) { 1638 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1639 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1640 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1641 // pretend it is the corresponding method in the non-strict class: 1642 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1643 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1644 break; 1645 default: 1646 break; 1647 } 1648 break; 1649 1650 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1651 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1652 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1653 if (!is_native()) break; 1654 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1655 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1656 id = vmIntrinsics::_none; 1657 break; 1658 1659 default: 1660 break; 1661 } 1662 1663 if (id != vmIntrinsics::_none) { 1664 // Set up its iid. It is an alias method. 1665 set_intrinsic_id(id); 1666 return; 1667 } 1668 } 1669 1670 // These two methods are static since a GC may move the Method 1671 bool Method::load_signature_classes(const methodHandle& m, TRAPS) { 1672 if (!THREAD->can_call_java()) { 1673 // There is nothing useful this routine can do from within the Compile thread. 1674 // Hopefully, the signature contains only well-known classes. 1675 // We could scan for this and return true/false, but the caller won't care. 1676 return false; 1677 } 1678 bool sig_is_loaded = true; 1679 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1680 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1681 ResourceMark rm(THREAD); 1682 Symbol* signature = m->signature(); 1683 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1684 if (ss.is_object()) { 1685 Symbol* sym = ss.as_symbol(); 1686 Symbol* name = sym; 1687 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1688 protection_domain, THREAD); 1689 // We are loading classes eagerly. If a ClassNotFoundException or 1690 // a LinkageError was generated, be sure to ignore it. 1691 if (HAS_PENDING_EXCEPTION) { 1692 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1693 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1694 CLEAR_PENDING_EXCEPTION; 1695 } else { 1696 return false; 1697 } 1698 } 1699 if( klass == NULL) { sig_is_loaded = false; } 1700 } 1701 } 1702 return sig_is_loaded; 1703 } 1704 1705 bool Method::has_unloaded_classes_in_signature(const methodHandle& m, TRAPS) { 1706 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1707 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1708 ResourceMark rm(THREAD); 1709 Symbol* signature = m->signature(); 1710 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1711 if (ss.type() == T_OBJECT) { 1712 Symbol* name = ss.as_symbol_or_null(); 1713 if (name == NULL) return true; 1714 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1715 if (klass == NULL) return true; 1716 } 1717 } 1718 return false; 1719 } 1720 1721 // Exposed so field engineers can debug VM 1722 void Method::print_short_name(outputStream* st) { 1723 ResourceMark rm; 1724 #ifdef PRODUCT 1725 st->print(" %s::", method_holder()->external_name()); 1726 #else 1727 st->print(" %s::", method_holder()->internal_name()); 1728 #endif 1729 name()->print_symbol_on(st); 1730 if (WizardMode) signature()->print_symbol_on(st); 1731 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1732 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1733 } 1734 1735 // Comparer for sorting an object array containing 1736 // Method*s. 1737 static int method_comparator(Method* a, Method* b) { 1738 return a->name()->fast_compare(b->name()); 1739 } 1740 1741 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1742 // default_methods also uses this without the ordering for fast find_method 1743 void Method::sort_methods(Array<Method*>* methods, bool set_idnums) { 1744 int length = methods->length(); 1745 if (length > 1) { 1746 { 1747 NoSafepointVerifier nsv; 1748 QuickSort::sort(methods->data(), length, method_comparator, /*idempotent=*/false); 1749 } 1750 // Reset method ordering 1751 if (set_idnums) { 1752 for (int i = 0; i < length; i++) { 1753 Method* m = methods->at(i); 1754 m->set_method_idnum(i); 1755 m->set_orig_method_idnum(i); 1756 } 1757 } 1758 } 1759 } 1760 1761 //----------------------------------------------------------------------------------- 1762 // Non-product code unless JVM/TI needs it 1763 1764 #if !defined(PRODUCT) || INCLUDE_JVMTI 1765 class SignatureTypePrinter : public SignatureTypeNames { 1766 private: 1767 outputStream* _st; 1768 bool _use_separator; 1769 1770 void type_name(const char* name) { 1771 if (_use_separator) _st->print(", "); 1772 _st->print("%s", name); 1773 _use_separator = true; 1774 } 1775 1776 public: 1777 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1778 _st = st; 1779 _use_separator = false; 1780 } 1781 1782 void print_parameters() { _use_separator = false; iterate_parameters(); } 1783 void print_returntype() { _use_separator = false; iterate_returntype(); } 1784 }; 1785 1786 1787 void Method::print_name(outputStream* st) { 1788 Thread *thread = Thread::current(); 1789 ResourceMark rm(thread); 1790 st->print("%s ", is_static() ? "static" : "virtual"); 1791 if (WizardMode) { 1792 st->print("%s.", method_holder()->internal_name()); 1793 name()->print_symbol_on(st); 1794 signature()->print_symbol_on(st); 1795 } else { 1796 SignatureTypePrinter sig(signature(), st); 1797 sig.print_returntype(); 1798 st->print(" %s.", method_holder()->internal_name()); 1799 name()->print_symbol_on(st); 1800 st->print("("); 1801 sig.print_parameters(); 1802 st->print(")"); 1803 } 1804 } 1805 #endif // !PRODUCT || INCLUDE_JVMTI 1806 1807 1808 void Method::print_codes_on(outputStream* st) const { 1809 print_codes_on(0, code_size(), st); 1810 } 1811 1812 void Method::print_codes_on(int from, int to, outputStream* st) const { 1813 Thread *thread = Thread::current(); 1814 ResourceMark rm(thread); 1815 methodHandle mh (thread, (Method*)this); 1816 BytecodeStream s(mh); 1817 s.set_interval(from, to); 1818 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1819 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1820 } 1821 1822 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1823 _bci = 0; 1824 _line = 0; 1825 }; 1826 1827 bool CompressedLineNumberReadStream::read_pair() { 1828 jubyte next = read_byte(); 1829 // Check for terminator 1830 if (next == 0) return false; 1831 if (next == 0xFF) { 1832 // Escape character, regular compression used 1833 _bci += read_signed_int(); 1834 _line += read_signed_int(); 1835 } else { 1836 // Single byte compression used 1837 _bci += next >> 3; 1838 _line += next & 0x7; 1839 } 1840 return true; 1841 } 1842 1843 #if INCLUDE_JVMTI 1844 1845 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1846 BreakpointInfo* bp = method_holder()->breakpoints(); 1847 for (; bp != NULL; bp = bp->next()) { 1848 if (bp->match(this, bci)) { 1849 return bp->orig_bytecode(); 1850 } 1851 } 1852 { 1853 ResourceMark rm; 1854 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1855 } 1856 return Bytecodes::_shouldnotreachhere; 1857 } 1858 1859 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1860 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1861 BreakpointInfo* bp = method_holder()->breakpoints(); 1862 for (; bp != NULL; bp = bp->next()) { 1863 if (bp->match(this, bci)) { 1864 bp->set_orig_bytecode(code); 1865 // and continue, in case there is more than one 1866 } 1867 } 1868 } 1869 1870 void Method::set_breakpoint(int bci) { 1871 InstanceKlass* ik = method_holder(); 1872 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1873 bp->set_next(ik->breakpoints()); 1874 ik->set_breakpoints(bp); 1875 // do this last: 1876 bp->set(this); 1877 } 1878 1879 static void clear_matches(Method* m, int bci) { 1880 InstanceKlass* ik = m->method_holder(); 1881 BreakpointInfo* prev_bp = NULL; 1882 BreakpointInfo* next_bp; 1883 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1884 next_bp = bp->next(); 1885 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1886 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1887 // do this first: 1888 bp->clear(m); 1889 // unhook it 1890 if (prev_bp != NULL) 1891 prev_bp->set_next(next_bp); 1892 else 1893 ik->set_breakpoints(next_bp); 1894 delete bp; 1895 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1896 // at same location. So we have multiple matching (method_index and bci) 1897 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1898 // breakpoint for clear_breakpoint request and keep all other method versions 1899 // BreakpointInfo for future clear_breakpoint request. 1900 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1901 // which is being called when class is unloaded. We delete all the Breakpoint 1902 // information for all versions of method. We may not correctly restore the original 1903 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1904 // so these methods won't be used anymore. 1905 if (bci >= 0) { 1906 break; 1907 } 1908 } else { 1909 // This one is a keeper. 1910 prev_bp = bp; 1911 } 1912 } 1913 } 1914 1915 void Method::clear_breakpoint(int bci) { 1916 assert(bci >= 0, ""); 1917 clear_matches(this, bci); 1918 } 1919 1920 void Method::clear_all_breakpoints() { 1921 clear_matches(this, -1); 1922 } 1923 1924 #endif // INCLUDE_JVMTI 1925 1926 int Method::invocation_count() { 1927 MethodCounters *mcs = method_counters(); 1928 if (TieredCompilation) { 1929 MethodData* const mdo = method_data(); 1930 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1931 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1932 return InvocationCounter::count_limit; 1933 } else { 1934 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1935 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1936 } 1937 } else { 1938 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1939 } 1940 } 1941 1942 int Method::backedge_count() { 1943 MethodCounters *mcs = method_counters(); 1944 if (TieredCompilation) { 1945 MethodData* const mdo = method_data(); 1946 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1947 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1948 return InvocationCounter::count_limit; 1949 } else { 1950 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1951 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1952 } 1953 } else { 1954 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1955 } 1956 } 1957 1958 int Method::highest_comp_level() const { 1959 const MethodCounters* mcs = method_counters(); 1960 if (mcs != NULL) { 1961 return mcs->highest_comp_level(); 1962 } else { 1963 return CompLevel_none; 1964 } 1965 } 1966 1967 int Method::highest_osr_comp_level() const { 1968 const MethodCounters* mcs = method_counters(); 1969 if (mcs != NULL) { 1970 return mcs->highest_osr_comp_level(); 1971 } else { 1972 return CompLevel_none; 1973 } 1974 } 1975 1976 void Method::set_highest_comp_level(int level) { 1977 MethodCounters* mcs = method_counters(); 1978 if (mcs != NULL) { 1979 mcs->set_highest_comp_level(level); 1980 } 1981 } 1982 1983 void Method::set_highest_osr_comp_level(int level) { 1984 MethodCounters* mcs = method_counters(); 1985 if (mcs != NULL) { 1986 mcs->set_highest_osr_comp_level(level); 1987 } 1988 } 1989 1990 #if INCLUDE_JVMTI 1991 1992 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1993 _bci = bci; 1994 _name_index = m->name_index(); 1995 _signature_index = m->signature_index(); 1996 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1997 if (_orig_bytecode == Bytecodes::_breakpoint) 1998 _orig_bytecode = m->orig_bytecode_at(_bci); 1999 _next = NULL; 2000 } 2001 2002 void BreakpointInfo::set(Method* method) { 2003 #ifdef ASSERT 2004 { 2005 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 2006 if (code == Bytecodes::_breakpoint) 2007 code = method->orig_bytecode_at(_bci); 2008 assert(orig_bytecode() == code, "original bytecode must be the same"); 2009 } 2010 #endif 2011 Thread *thread = Thread::current(); 2012 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 2013 method->incr_number_of_breakpoints(thread); 2014 SystemDictionary::notice_modification(); 2015 { 2016 // Deoptimize all dependents on this method 2017 HandleMark hm(thread); 2018 methodHandle mh(thread, method); 2019 CodeCache::flush_dependents_on_method(mh); 2020 } 2021 } 2022 2023 void BreakpointInfo::clear(Method* method) { 2024 *method->bcp_from(_bci) = orig_bytecode(); 2025 assert(method->number_of_breakpoints() > 0, "must not go negative"); 2026 method->decr_number_of_breakpoints(Thread::current()); 2027 } 2028 2029 #endif // INCLUDE_JVMTI 2030 2031 // jmethodID handling 2032 2033 // This is a block allocating object, sort of like JNIHandleBlock, only a 2034 // lot simpler. 2035 // It's allocated on the CHeap because once we allocate a jmethodID, we can 2036 // never get rid of it. 2037 2038 static const int min_block_size = 8; 2039 2040 class JNIMethodBlockNode : public CHeapObj<mtClass> { 2041 friend class JNIMethodBlock; 2042 Method** _methods; 2043 int _number_of_methods; 2044 int _top; 2045 JNIMethodBlockNode* _next; 2046 2047 public: 2048 2049 JNIMethodBlockNode(int num_methods = min_block_size); 2050 2051 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 2052 2053 void ensure_methods(int num_addl_methods) { 2054 if (_top < _number_of_methods) { 2055 num_addl_methods -= _number_of_methods - _top; 2056 if (num_addl_methods <= 0) { 2057 return; 2058 } 2059 } 2060 if (_next == NULL) { 2061 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 2062 } else { 2063 _next->ensure_methods(num_addl_methods); 2064 } 2065 } 2066 }; 2067 2068 class JNIMethodBlock : public CHeapObj<mtClass> { 2069 JNIMethodBlockNode _head; 2070 JNIMethodBlockNode *_last_free; 2071 public: 2072 static Method* const _free_method; 2073 2074 JNIMethodBlock(int initial_capacity = min_block_size) 2075 : _head(initial_capacity), _last_free(&_head) {} 2076 2077 void ensure_methods(int num_addl_methods) { 2078 _last_free->ensure_methods(num_addl_methods); 2079 } 2080 2081 Method** add_method(Method* m) { 2082 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) { 2083 if (b->_top < b->_number_of_methods) { 2084 // top points to the next free entry. 2085 int i = b->_top; 2086 b->_methods[i] = m; 2087 b->_top++; 2088 _last_free = b; 2089 return &(b->_methods[i]); 2090 } else if (b->_top == b->_number_of_methods) { 2091 // if the next free entry ran off the block see if there's a free entry 2092 for (int i = 0; i < b->_number_of_methods; i++) { 2093 if (b->_methods[i] == _free_method) { 2094 b->_methods[i] = m; 2095 _last_free = b; 2096 return &(b->_methods[i]); 2097 } 2098 } 2099 // Only check each block once for frees. They're very unlikely. 2100 // Increment top past the end of the block. 2101 b->_top++; 2102 } 2103 // need to allocate a next block. 2104 if (b->_next == NULL) { 2105 b->_next = _last_free = new JNIMethodBlockNode(); 2106 } 2107 } 2108 guarantee(false, "Should always allocate a free block"); 2109 return NULL; 2110 } 2111 2112 bool contains(Method** m) { 2113 if (m == NULL) return false; 2114 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2115 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2116 // This is a bit of extra checking, for two reasons. One is 2117 // that contains() deals with pointers that are passed in by 2118 // JNI code, so making sure that the pointer is aligned 2119 // correctly is valuable. The other is that <= and > are 2120 // technically not defined on pointers, so the if guard can 2121 // pass spuriously; no modern compiler is likely to make that 2122 // a problem, though (and if one did, the guard could also 2123 // fail spuriously, which would be bad). 2124 ptrdiff_t idx = m - b->_methods; 2125 if (b->_methods + idx == m) { 2126 return true; 2127 } 2128 } 2129 } 2130 return false; // not found 2131 } 2132 2133 // Doesn't really destroy it, just marks it as free so it can be reused. 2134 void destroy_method(Method** m) { 2135 #ifdef ASSERT 2136 assert(contains(m), "should be a methodID"); 2137 #endif // ASSERT 2138 *m = _free_method; 2139 } 2140 2141 // During class unloading the methods are cleared, which is different 2142 // than freed. 2143 void clear_all_methods() { 2144 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2145 for (int i = 0; i< b->_number_of_methods; i++) { 2146 b->_methods[i] = NULL; 2147 } 2148 } 2149 } 2150 #ifndef PRODUCT 2151 int count_methods() { 2152 // count all allocated methods 2153 int count = 0; 2154 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2155 for (int i = 0; i< b->_number_of_methods; i++) { 2156 if (b->_methods[i] != _free_method) count++; 2157 } 2158 } 2159 return count; 2160 } 2161 #endif // PRODUCT 2162 }; 2163 2164 // Something that can't be mistaken for an address or a markOop 2165 Method* const JNIMethodBlock::_free_method = (Method*)55; 2166 2167 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(NULL) { 2168 _number_of_methods = MAX2(num_methods, min_block_size); 2169 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2170 for (int i = 0; i < _number_of_methods; i++) { 2171 _methods[i] = JNIMethodBlock::_free_method; 2172 } 2173 } 2174 2175 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) { 2176 ClassLoaderData* cld = loader_data; 2177 if (!SafepointSynchronize::is_at_safepoint()) { 2178 // Have to add jmethod_ids() to class loader data thread-safely. 2179 // Also have to add the method to the list safely, which the cld lock 2180 // protects as well. 2181 MutexLocker ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2182 if (cld->jmethod_ids() == NULL) { 2183 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2184 } else { 2185 cld->jmethod_ids()->ensure_methods(capacity); 2186 } 2187 } else { 2188 // At safepoint, we are single threaded and can set this. 2189 if (cld->jmethod_ids() == NULL) { 2190 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2191 } else { 2192 cld->jmethod_ids()->ensure_methods(capacity); 2193 } 2194 } 2195 } 2196 2197 // Add a method id to the jmethod_ids 2198 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 2199 ClassLoaderData* cld = loader_data; 2200 2201 if (!SafepointSynchronize::is_at_safepoint()) { 2202 // Have to add jmethod_ids() to class loader data thread-safely. 2203 // Also have to add the method to the list safely, which the cld lock 2204 // protects as well. 2205 MutexLocker ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2206 if (cld->jmethod_ids() == NULL) { 2207 cld->set_jmethod_ids(new JNIMethodBlock()); 2208 } 2209 // jmethodID is a pointer to Method* 2210 return (jmethodID)cld->jmethod_ids()->add_method(m); 2211 } else { 2212 // At safepoint, we are single threaded and can set this. 2213 if (cld->jmethod_ids() == NULL) { 2214 cld->set_jmethod_ids(new JNIMethodBlock()); 2215 } 2216 // jmethodID is a pointer to Method* 2217 return (jmethodID)cld->jmethod_ids()->add_method(m); 2218 } 2219 } 2220 2221 // Mark a jmethodID as free. This is called when there is a data race in 2222 // InstanceKlass while creating the jmethodID cache. 2223 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 2224 ClassLoaderData* cld = loader_data; 2225 Method** ptr = (Method**)m; 2226 assert(cld->jmethod_ids() != NULL, "should have method handles"); 2227 cld->jmethod_ids()->destroy_method(ptr); 2228 } 2229 2230 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2231 // Can't assert the method_holder is the same because the new method has the 2232 // scratch method holder. 2233 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2234 == new_method->method_holder()->class_loader() || 2235 new_method->method_holder()->class_loader() == NULL, // allow Unsafe substitution 2236 "changing to a different class loader"); 2237 // Just change the method in place, jmethodID pointer doesn't change. 2238 *((Method**)jmid) = new_method; 2239 } 2240 2241 bool Method::is_method_id(jmethodID mid) { 2242 Method* m = resolve_jmethod_id(mid); 2243 assert(m != NULL, "should be called with non-null method"); 2244 InstanceKlass* ik = m->method_holder(); 2245 ClassLoaderData* cld = ik->class_loader_data(); 2246 if (cld->jmethod_ids() == NULL) return false; 2247 return (cld->jmethod_ids()->contains((Method**)mid)); 2248 } 2249 2250 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2251 if (mid == NULL) return NULL; 2252 Method* o = resolve_jmethod_id(mid); 2253 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 2254 return NULL; 2255 } 2256 return o; 2257 }; 2258 2259 void Method::set_on_stack(const bool value) { 2260 // Set both the method itself and its constant pool. The constant pool 2261 // on stack means some method referring to it is also on the stack. 2262 constants()->set_on_stack(value); 2263 2264 bool already_set = on_stack(); 2265 _access_flags.set_on_stack(value); 2266 if (value && !already_set) { 2267 MetadataOnStackMark::record(this); 2268 } 2269 assert(!value || !is_old() || is_obsolete() || is_running_emcp(), 2270 "emcp methods cannot run after emcp bit is cleared"); 2271 } 2272 2273 // Called when the class loader is unloaded to make all methods weak. 2274 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2275 loader_data->jmethod_ids()->clear_all_methods(); 2276 } 2277 2278 bool Method::has_method_vptr(const void* ptr) { 2279 Method m; 2280 // This assumes that the vtbl pointer is the first word of a C++ object. 2281 return dereference_vptr(&m) == dereference_vptr(ptr); 2282 } 2283 2284 // Check that this pointer is valid by checking that the vtbl pointer matches 2285 bool Method::is_valid_method(const Method* m) { 2286 if (m == NULL) { 2287 return false; 2288 } else if ((intptr_t(m) & (wordSize-1)) != 0) { 2289 // Quick sanity check on pointer. 2290 return false; 2291 } else if (m->is_shared()) { 2292 return MetaspaceShared::is_valid_shared_method(m); 2293 } else if (Metaspace::contains_non_shared(m)) { 2294 return has_method_vptr((const void*)m); 2295 } else { 2296 return false; 2297 } 2298 } 2299 2300 #ifndef PRODUCT 2301 void Method::print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) { 2302 out->print(" jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 2303 } 2304 #endif // PRODUCT 2305 2306 2307 // Printing 2308 2309 #ifndef PRODUCT 2310 2311 void Method::print_on(outputStream* st) const { 2312 ResourceMark rm; 2313 assert(is_method(), "must be method"); 2314 st->print_cr("%s", internal_name()); 2315 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this)); 2316 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2317 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants())); 2318 constants()->print_value_on(st); st->cr(); 2319 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2320 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2321 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2322 st->print_cr(" - max stack: %d", max_stack()); 2323 st->print_cr(" - max locals: %d", max_locals()); 2324 st->print_cr(" - size of params: %d", size_of_parameters()); 2325 st->print_cr(" - method size: %d", method_size()); 2326 if (intrinsic_id() != vmIntrinsics::_none) 2327 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 2328 if (highest_comp_level() != CompLevel_none) 2329 st->print_cr(" - highest level: %d", highest_comp_level()); 2330 st->print_cr(" - vtable index: %d", _vtable_index); 2331 if (valid_itable_index()) 2332 st->print_cr(" - itable index: %d", itable_index()); 2333 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry())); 2334 st->print( " - adapters: "); 2335 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2336 if (a == NULL) 2337 st->print_cr(INTPTR_FORMAT, p2i(a)); 2338 else 2339 a->print_adapter_on(st); 2340 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry())); 2341 st->print_cr(" - code size: %d", code_size()); 2342 if (code_size() != 0) { 2343 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base())); 2344 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size())); 2345 } 2346 if (method_data() != NULL) { 2347 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data())); 2348 } 2349 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2350 if (checked_exceptions_length() > 0) { 2351 CheckedExceptionElement* table = checked_exceptions_start(); 2352 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table)); 2353 if (Verbose) { 2354 for (int i = 0; i < checked_exceptions_length(); i++) { 2355 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2356 } 2357 } 2358 } 2359 if (has_linenumber_table()) { 2360 u_char* table = compressed_linenumber_table(); 2361 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table)); 2362 if (Verbose) { 2363 CompressedLineNumberReadStream stream(table); 2364 while (stream.read_pair()) { 2365 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2366 } 2367 } 2368 } 2369 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2370 if (localvariable_table_length() > 0) { 2371 LocalVariableTableElement* table = localvariable_table_start(); 2372 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table)); 2373 if (Verbose) { 2374 for (int i = 0; i < localvariable_table_length(); i++) { 2375 int bci = table[i].start_bci; 2376 int len = table[i].length; 2377 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2378 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2379 int slot = table[i].slot; 2380 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2381 } 2382 } 2383 } 2384 if (code() != NULL) { 2385 st->print (" - compiled code: "); 2386 code()->print_value_on(st); 2387 } 2388 if (is_native()) { 2389 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function())); 2390 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler())); 2391 } 2392 } 2393 2394 void Method::print_linkage_flags(outputStream* st) { 2395 access_flags().print_on(st); 2396 if (is_default_method()) { 2397 st->print("default "); 2398 } 2399 if (is_overpass()) { 2400 st->print("overpass "); 2401 } 2402 } 2403 #endif //PRODUCT 2404 2405 void Method::print_value_on(outputStream* st) const { 2406 assert(is_method(), "must be method"); 2407 st->print("%s", internal_name()); 2408 print_address_on(st); 2409 st->print(" "); 2410 if (WizardMode) access_flags().print_on(st); 2411 name()->print_value_on(st); 2412 st->print(" "); 2413 signature()->print_value_on(st); 2414 st->print(" in "); 2415 method_holder()->print_value_on(st); 2416 if (WizardMode) st->print("#%d", _vtable_index); 2417 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2418 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2419 } 2420 2421 #if INCLUDE_SERVICES 2422 // Size Statistics 2423 void Method::collect_statistics(KlassSizeStats *sz) const { 2424 int mysize = sz->count(this); 2425 sz->_method_bytes += mysize; 2426 sz->_method_all_bytes += mysize; 2427 sz->_rw_bytes += mysize; 2428 2429 if (constMethod()) { 2430 constMethod()->collect_statistics(sz); 2431 } 2432 if (method_data()) { 2433 method_data()->collect_statistics(sz); 2434 } 2435 } 2436 #endif // INCLUDE_SERVICES 2437 2438 // LogTouchedMethods and PrintTouchedMethods 2439 2440 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because 2441 // the Method may be garbage collected. Let's roll our own hash table. 2442 class TouchedMethodRecord : CHeapObj<mtTracing> { 2443 public: 2444 // It's OK to store Symbols here because they will NOT be GC'ed if 2445 // LogTouchedMethods is enabled. 2446 TouchedMethodRecord* _next; 2447 Symbol* _class_name; 2448 Symbol* _method_name; 2449 Symbol* _method_signature; 2450 }; 2451 2452 static const int TOUCHED_METHOD_TABLE_SIZE = 20011; 2453 static TouchedMethodRecord** _touched_method_table = NULL; 2454 2455 void Method::log_touched(TRAPS) { 2456 2457 const int table_size = TOUCHED_METHOD_TABLE_SIZE; 2458 Symbol* my_class = klass_name(); 2459 Symbol* my_name = name(); 2460 Symbol* my_sig = signature(); 2461 2462 unsigned int hash = my_class->identity_hash() + 2463 my_name->identity_hash() + 2464 my_sig->identity_hash(); 2465 juint index = juint(hash) % table_size; 2466 2467 MutexLocker ml(TouchedMethodLog_lock, THREAD); 2468 if (_touched_method_table == NULL) { 2469 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size, 2470 mtTracing, CURRENT_PC); 2471 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size); 2472 } 2473 2474 TouchedMethodRecord* ptr = _touched_method_table[index]; 2475 while (ptr) { 2476 if (ptr->_class_name == my_class && 2477 ptr->_method_name == my_name && 2478 ptr->_method_signature == my_sig) { 2479 return; 2480 } 2481 if (ptr->_next == NULL) break; 2482 ptr = ptr->_next; 2483 } 2484 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing); 2485 my_class->increment_refcount(); 2486 my_name->increment_refcount(); 2487 my_sig->increment_refcount(); 2488 nptr->_class_name = my_class; 2489 nptr->_method_name = my_name; 2490 nptr->_method_signature = my_sig; 2491 nptr->_next = NULL; 2492 2493 if (ptr == NULL) { 2494 // first 2495 _touched_method_table[index] = nptr; 2496 } else { 2497 ptr->_next = nptr; 2498 } 2499 } 2500 2501 void Method::print_touched_methods(outputStream* out) { 2502 MutexLocker ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock); 2503 out->print_cr("# Method::print_touched_methods version 1"); 2504 if (_touched_method_table) { 2505 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) { 2506 TouchedMethodRecord* ptr = _touched_method_table[i]; 2507 while(ptr) { 2508 ptr->_class_name->print_symbol_on(out); out->print("."); 2509 ptr->_method_name->print_symbol_on(out); out->print(":"); 2510 ptr->_method_signature->print_symbol_on(out); out->cr(); 2511 ptr = ptr->_next; 2512 } 2513 } 2514 } 2515 } 2516 2517 // Verification 2518 2519 void Method::verify_on(outputStream* st) { 2520 guarantee(is_method(), "object must be method"); 2521 guarantee(constants()->is_constantPool(), "should be constant pool"); 2522 MethodData* md = method_data(); 2523 guarantee(md == NULL || 2524 md->is_methodData(), "should be method data"); 2525 }