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 "prims/jvmtiExport.hpp" 54 #include "prims/methodHandles.hpp" 55 #include "prims/nativeLookup.hpp" 56 #include "runtime/arguments.hpp" 57 #include "runtime/compilationPolicy.hpp" 58 #include "runtime/frame.inline.hpp" 59 #include "runtime/handles.inline.hpp" 60 #include "runtime/init.hpp" 61 #include "runtime/orderAccess.hpp" 62 #include "runtime/relocator.hpp" 63 #include "runtime/safepointVerifiers.hpp" 64 #include "runtime/sharedRuntime.hpp" 65 #include "runtime/signature.hpp" 66 #include "utilities/align.hpp" 67 #include "utilities/quickSort.hpp" 68 #include "utilities/vmError.hpp" 69 #include "utilities/xmlstream.hpp" 70 71 // Implementation of Method 72 73 Method* Method::allocate(ClassLoaderData* loader_data, 74 int byte_code_size, 75 AccessFlags access_flags, 76 InlineTableSizes* sizes, 77 ConstMethod::MethodType method_type, 78 TRAPS) { 79 assert(!access_flags.is_native() || byte_code_size == 0, 80 "native methods should not contain byte codes"); 81 ConstMethod* cm = ConstMethod::allocate(loader_data, 82 byte_code_size, 83 sizes, 84 method_type, 85 CHECK_NULL); 86 int size = Method::size(access_flags.is_native()); 87 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags); 88 } 89 90 Method::Method(ConstMethod* xconst, AccessFlags access_flags) { 91 NoSafepointVerifier no_safepoint; 92 set_constMethod(xconst); 93 set_access_flags(access_flags); 94 set_intrinsic_id(vmIntrinsics::_none); 95 set_force_inline(false); 96 set_hidden(false); 97 set_dont_inline(false); 98 set_has_injected_profile(false); 99 set_method_data(NULL); 100 clear_method_counters(); 101 set_vtable_index(Method::garbage_vtable_index); 102 103 // Fix and bury in Method* 104 set_interpreter_entry(NULL); // sets i2i entry and from_int 105 set_adapter_entry(NULL); 106 Method::clear_code(); // from_c/from_i get set to c2i/i2i 107 108 if (access_flags.is_native()) { 109 clear_native_function(); 110 set_signature_handler(NULL); 111 } 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_unverified_entry() { 145 assert(adapter() != NULL, "must have"); 146 return adapter()->get_c2i_unverified_entry(); 147 } 148 149 address Method::get_c2i_no_clinit_check_entry() { 150 assert(VM_Version::supports_fast_class_init_checks(), ""); 151 assert(adapter() != NULL, "must have"); 152 return adapter()->get_c2i_no_clinit_check_entry(); 153 } 154 155 char* Method::name_and_sig_as_C_string() const { 156 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 157 } 158 159 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 160 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 161 } 162 163 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 164 const char* klass_name = klass->external_name(); 165 int klass_name_len = (int)strlen(klass_name); 166 int method_name_len = method_name->utf8_length(); 167 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 168 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 169 strcpy(dest, klass_name); 170 dest[klass_name_len] = '.'; 171 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 172 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 173 dest[len] = 0; 174 return dest; 175 } 176 177 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 178 Symbol* klass_name = klass->name(); 179 klass_name->as_klass_external_name(buf, size); 180 int len = (int)strlen(buf); 181 182 if (len < size - 1) { 183 buf[len++] = '.'; 184 185 method_name->as_C_string(&(buf[len]), size - len); 186 len = (int)strlen(buf); 187 188 signature->as_C_string(&(buf[len]), size - len); 189 } 190 191 return buf; 192 } 193 194 const char* Method::external_name() const { 195 return external_name(constants()->pool_holder(), name(), signature()); 196 } 197 198 void Method::print_external_name(outputStream *os) const { 199 print_external_name(os, constants()->pool_holder(), name(), signature()); 200 } 201 202 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) { 203 stringStream ss; 204 print_external_name(&ss, klass, method_name, signature); 205 return ss.as_string(); 206 } 207 208 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) { 209 signature->print_as_signature_external_return_type(os); 210 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string()); 211 signature->print_as_signature_external_parameters(os); 212 os->print(")"); 213 } 214 215 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) { 216 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 217 // access exception table 218 ExceptionTable table(mh()); 219 int length = table.length(); 220 // iterate through all entries sequentially 221 constantPoolHandle pool(THREAD, mh->constants()); 222 for (int i = 0; i < length; i ++) { 223 //reacquire the table in case a GC happened 224 ExceptionTable table(mh()); 225 int beg_bci = table.start_pc(i); 226 int end_bci = table.end_pc(i); 227 assert(beg_bci <= end_bci, "inconsistent exception table"); 228 if (beg_bci <= throw_bci && throw_bci < end_bci) { 229 // exception handler bci range covers throw_bci => investigate further 230 int handler_bci = table.handler_pc(i); 231 int klass_index = table.catch_type_index(i); 232 if (klass_index == 0) { 233 return handler_bci; 234 } else if (ex_klass == NULL) { 235 return handler_bci; 236 } else { 237 // we know the exception class => get the constraint class 238 // this may require loading of the constraint class; if verification 239 // fails or some other exception occurs, return handler_bci 240 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); 241 assert(k != NULL, "klass not loaded"); 242 if (ex_klass->is_subtype_of(k)) { 243 return handler_bci; 244 } 245 } 246 } 247 } 248 249 return -1; 250 } 251 252 void Method::mask_for(int bci, InterpreterOopMap* mask) { 253 methodHandle h_this(Thread::current(), this); 254 // Only GC uses the OopMapCache during thread stack root scanning 255 // any other uses generate an oopmap but do not save it in the cache. 256 if (Universe::heap()->is_gc_active()) { 257 method_holder()->mask_for(h_this, bci, mask); 258 } else { 259 OopMapCache::compute_one_oop_map(h_this, bci, mask); 260 } 261 return; 262 } 263 264 265 int Method::bci_from(address bcp) const { 266 if (is_native() && bcp == 0) { 267 return 0; 268 } 269 #ifdef ASSERT 270 { 271 ResourceMark rm; 272 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(), 273 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", 274 p2i(bcp), name_and_sig_as_C_string()); 275 } 276 #endif 277 return bcp - code_base(); 278 } 279 280 281 int Method::validate_bci(int bci) const { 282 return (bci == 0 || bci < code_size()) ? bci : -1; 283 } 284 285 // Return bci if it appears to be a valid bcp 286 // Return -1 otherwise. 287 // Used by profiling code, when invalid data is a possibility. 288 // The caller is responsible for validating the Method* itself. 289 int Method::validate_bci_from_bcp(address bcp) const { 290 // keep bci as -1 if not a valid bci 291 int bci = -1; 292 if (bcp == 0 || bcp == code_base()) { 293 // code_size() may return 0 and we allow 0 here 294 // the method may be native 295 bci = 0; 296 } else if (contains(bcp)) { 297 bci = bcp - code_base(); 298 } 299 // Assert that if we have dodged any asserts, bci is negative. 300 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 301 return bci; 302 } 303 304 address Method::bcp_from(int bci) const { 305 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), 306 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native"); 307 address bcp = code_base() + bci; 308 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 309 return bcp; 310 } 311 312 address Method::bcp_from(address bcp) const { 313 if (is_native() && bcp == NULL) { 314 return code_base(); 315 } else { 316 return bcp; 317 } 318 } 319 320 int Method::size(bool is_native) { 321 // If native, then include pointers for native_function and signature_handler 322 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 323 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord; 324 return align_metadata_size(header_size() + extra_words); 325 } 326 327 Symbol* Method::klass_name() const { 328 return method_holder()->name(); 329 } 330 331 void Method::metaspace_pointers_do(MetaspaceClosure* it) { 332 log_trace(cds)("Iter(Method): %p", this); 333 334 it->push(&_constMethod); 335 it->push(&_method_data); 336 it->push(&_method_counters); 337 338 Method* this_ptr = this; 339 it->push_method_entry(&this_ptr, (intptr_t*)&_i2i_entry); 340 it->push_method_entry(&this_ptr, (intptr_t*)&_from_compiled_entry); 341 it->push_method_entry(&this_ptr, (intptr_t*)&_from_interpreted_entry); 342 } 343 344 // Attempt to return method oop to original state. Clear any pointers 345 // (to objects outside the shared spaces). We won't be able to predict 346 // where they should point in a new JVM. Further initialize some 347 // entries now in order allow them to be write protected later. 348 349 void Method::remove_unshareable_info() { 350 unlink_method(); 351 } 352 353 void Method::set_vtable_index(int index) { 354 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 355 // At runtime initialize_vtable is rerun as part of link_class_impl() 356 // for a shared class loaded by the non-boot loader to obtain the loader 357 // constraints based on the runtime classloaders' context. 358 return; // don't write into the shared class 359 } else { 360 _vtable_index = index; 361 } 362 } 363 364 void Method::set_itable_index(int index) { 365 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 366 // At runtime initialize_itable is rerun as part of link_class_impl() 367 // for a shared class loaded by the non-boot loader to obtain the loader 368 // constraints based on the runtime classloaders' context. The dumptime 369 // itable index should be the same as the runtime index. 370 assert(_vtable_index == itable_index_max - index, 371 "archived itable index is different from runtime index"); 372 return; // don’t write into the shared class 373 } else { 374 _vtable_index = itable_index_max - index; 375 } 376 assert(valid_itable_index(), ""); 377 } 378 379 380 381 bool Method::was_executed_more_than(int n) { 382 // Invocation counter is reset when the Method* is compiled. 383 // If the method has compiled code we therefore assume it has 384 // be excuted more than n times. 385 if (is_accessor() || is_empty_method() || (code() != NULL)) { 386 // interpreter doesn't bump invocation counter of trivial methods 387 // compiler does not bump invocation counter of compiled methods 388 return true; 389 } 390 else if ((method_counters() != NULL && 391 method_counters()->invocation_counter()->carry()) || 392 (method_data() != NULL && 393 method_data()->invocation_counter()->carry())) { 394 // The carry bit is set when the counter overflows and causes 395 // a compilation to occur. We don't know how many times 396 // the counter has been reset, so we simply assume it has 397 // been executed more than n times. 398 return true; 399 } else { 400 return invocation_count() > n; 401 } 402 } 403 404 void Method::print_invocation_count() { 405 if (is_static()) tty->print("static "); 406 if (is_final()) tty->print("final "); 407 if (is_synchronized()) tty->print("synchronized "); 408 if (is_native()) tty->print("native "); 409 tty->print("%s::", method_holder()->external_name()); 410 name()->print_symbol_on(tty); 411 signature()->print_symbol_on(tty); 412 413 if (WizardMode) { 414 // dump the size of the byte codes 415 tty->print(" {%d}", code_size()); 416 } 417 tty->cr(); 418 419 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 420 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 421 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 422 #ifndef PRODUCT 423 if (CountCompiledCalls) { 424 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 425 } 426 #endif 427 } 428 429 // Build a MethodData* object to hold information about this method 430 // collected in the interpreter. 431 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) { 432 // Do not profile the method if metaspace has hit an OOM previously 433 // allocating profiling data. Callers clear pending exception so don't 434 // add one here. 435 if (ClassLoaderDataGraph::has_metaspace_oom()) { 436 return; 437 } 438 439 // Grab a lock here to prevent multiple 440 // MethodData*s from being created. 441 MutexLocker ml(MethodData_lock, THREAD); 442 if (method->method_data() == NULL) { 443 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 444 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 445 if (HAS_PENDING_EXCEPTION) { 446 CompileBroker::log_metaspace_failure(); 447 ClassLoaderDataGraph::set_metaspace_oom(true); 448 return; // return the exception (which is cleared) 449 } 450 451 method->set_method_data(method_data); 452 if (PrintMethodData && (Verbose || WizardMode)) { 453 ResourceMark rm(THREAD); 454 tty->print("build_interpreter_method_data for "); 455 method->print_name(tty); 456 tty->cr(); 457 // At the end of the run, the MDO, full of data, will be dumped. 458 } 459 } 460 } 461 462 MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 463 // Do not profile the method if metaspace has hit an OOM previously 464 if (ClassLoaderDataGraph::has_metaspace_oom()) { 465 return NULL; 466 } 467 468 methodHandle mh(m); 469 MethodCounters* counters = MethodCounters::allocate(mh, THREAD); 470 if (HAS_PENDING_EXCEPTION) { 471 CompileBroker::log_metaspace_failure(); 472 ClassLoaderDataGraph::set_metaspace_oom(true); 473 return NULL; // return the exception (which is cleared) 474 } 475 if (!mh->init_method_counters(counters)) { 476 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 477 } 478 479 if (LogTouchedMethods) { 480 mh->log_touched(CHECK_NULL); 481 } 482 483 return mh->method_counters(); 484 } 485 486 bool Method::init_method_counters(MethodCounters* counters) { 487 // Try to install a pointer to MethodCounters, return true on success. 488 return Atomic::replace_if_null(counters, &_method_counters); 489 } 490 491 int Method::extra_stack_words() { 492 // not an inline function, to avoid a header dependency on Interpreter 493 return extra_stack_entries() * Interpreter::stackElementSize; 494 } 495 496 497 void Method::compute_size_of_parameters(Thread *thread) { 498 ArgumentSizeComputer asc(signature()); 499 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 500 } 501 502 BasicType Method::result_type() const { 503 ResultTypeFinder rtf(signature()); 504 return rtf.type(); 505 } 506 507 508 bool Method::is_empty_method() const { 509 return code_size() == 1 510 && *code_base() == Bytecodes::_return; 511 } 512 513 514 bool Method::is_vanilla_constructor() const { 515 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 516 // which only calls the superclass vanilla constructor and possibly does stores of 517 // zero constants to local fields: 518 // 519 // aload_0 520 // invokespecial 521 // indexbyte1 522 // indexbyte2 523 // 524 // followed by an (optional) sequence of: 525 // 526 // aload_0 527 // aconst_null / iconst_0 / fconst_0 / dconst_0 528 // putfield 529 // indexbyte1 530 // indexbyte2 531 // 532 // followed by: 533 // 534 // return 535 536 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 537 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 538 int size = code_size(); 539 // Check if size match 540 if (size == 0 || size % 5 != 0) return false; 541 address cb = code_base(); 542 int last = size - 1; 543 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 544 // Does not call superclass default constructor 545 return false; 546 } 547 // Check optional sequence 548 for (int i = 4; i < last; i += 5) { 549 if (cb[i] != Bytecodes::_aload_0) return false; 550 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 551 if (cb[i+2] != Bytecodes::_putfield) return false; 552 } 553 return true; 554 } 555 556 557 bool Method::compute_has_loops_flag() { 558 BytecodeStream bcs(this); 559 Bytecodes::Code bc; 560 561 while ((bc = bcs.next()) >= 0) { 562 switch( bc ) { 563 case Bytecodes::_ifeq: 564 case Bytecodes::_ifnull: 565 case Bytecodes::_iflt: 566 case Bytecodes::_ifle: 567 case Bytecodes::_ifne: 568 case Bytecodes::_ifnonnull: 569 case Bytecodes::_ifgt: 570 case Bytecodes::_ifge: 571 case Bytecodes::_if_icmpeq: 572 case Bytecodes::_if_icmpne: 573 case Bytecodes::_if_icmplt: 574 case Bytecodes::_if_icmpgt: 575 case Bytecodes::_if_icmple: 576 case Bytecodes::_if_icmpge: 577 case Bytecodes::_if_acmpeq: 578 case Bytecodes::_if_acmpne: 579 case Bytecodes::_goto: 580 case Bytecodes::_jsr: 581 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 582 break; 583 584 case Bytecodes::_goto_w: 585 case Bytecodes::_jsr_w: 586 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 587 break; 588 589 default: 590 break; 591 } 592 } 593 _access_flags.set_loops_flag_init(); 594 return _access_flags.has_loops(); 595 } 596 597 bool Method::is_final_method(AccessFlags class_access_flags) const { 598 // or "does_not_require_vtable_entry" 599 // default method or overpass can occur, is not final (reuses vtable entry) 600 // private methods in classes get vtable entries for backward class compatibility. 601 if (is_overpass() || is_default_method()) return false; 602 return is_final() || class_access_flags.is_final(); 603 } 604 605 bool Method::is_final_method() const { 606 return is_final_method(method_holder()->access_flags()); 607 } 608 609 bool Method::is_default_method() const { 610 if (method_holder() != NULL && 611 method_holder()->is_interface() && 612 !is_abstract() && !is_private()) { 613 return true; 614 } else { 615 return false; 616 } 617 } 618 619 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 620 if (is_final_method(class_access_flags)) return true; 621 #ifdef ASSERT 622 ResourceMark rm; 623 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 624 if (class_access_flags.is_interface()) { 625 assert(is_nonv == is_static() || is_nonv == is_private(), 626 "nonvirtual unexpected for non-static, non-private: %s", 627 name_and_sig_as_C_string()); 628 } 629 #endif 630 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 631 return vtable_index() == nonvirtual_vtable_index; 632 } 633 634 bool Method::can_be_statically_bound() const { 635 return can_be_statically_bound(method_holder()->access_flags()); 636 } 637 638 bool Method::can_be_statically_bound(InstanceKlass* context) const { 639 return (method_holder() == context) && can_be_statically_bound(); 640 } 641 642 bool Method::is_accessor() const { 643 return is_getter() || is_setter(); 644 } 645 646 bool Method::is_getter() const { 647 if (code_size() != 5) return false; 648 if (size_of_parameters() != 1) return false; 649 if (java_code_at(0) != Bytecodes::_aload_0) return false; 650 if (java_code_at(1) != Bytecodes::_getfield) return false; 651 switch (java_code_at(4)) { 652 case Bytecodes::_ireturn: 653 case Bytecodes::_lreturn: 654 case Bytecodes::_freturn: 655 case Bytecodes::_dreturn: 656 case Bytecodes::_areturn: 657 break; 658 default: 659 return false; 660 } 661 return true; 662 } 663 664 bool Method::is_setter() const { 665 if (code_size() != 6) return false; 666 if (java_code_at(0) != Bytecodes::_aload_0) return false; 667 switch (java_code_at(1)) { 668 case Bytecodes::_iload_1: 669 case Bytecodes::_aload_1: 670 case Bytecodes::_fload_1: 671 if (size_of_parameters() != 2) return false; 672 break; 673 case Bytecodes::_dload_1: 674 case Bytecodes::_lload_1: 675 if (size_of_parameters() != 3) return false; 676 break; 677 default: 678 return false; 679 } 680 if (java_code_at(2) != Bytecodes::_putfield) return false; 681 if (java_code_at(5) != Bytecodes::_return) return false; 682 return true; 683 } 684 685 bool Method::is_constant_getter() const { 686 int last_index = code_size() - 1; 687 // Check if the first 1-3 bytecodes are a constant push 688 // and the last bytecode is a return. 689 return (2 <= code_size() && code_size() <= 4 && 690 Bytecodes::is_const(java_code_at(0)) && 691 Bytecodes::length_for(java_code_at(0)) == last_index && 692 Bytecodes::is_return(java_code_at(last_index))); 693 } 694 695 bool Method::is_initializer() const { 696 return is_object_initializer() || is_static_initializer(); 697 } 698 699 bool Method::has_valid_initializer_flags() const { 700 return (is_static() || 701 method_holder()->major_version() < 51); 702 } 703 704 bool Method::is_static_initializer() const { 705 // For classfiles version 51 or greater, ensure that the clinit method is 706 // static. Non-static methods with the name "<clinit>" are not static 707 // initializers. (older classfiles exempted for backward compatibility) 708 return name() == vmSymbols::class_initializer_name() && 709 has_valid_initializer_flags(); 710 } 711 712 bool Method::is_object_initializer() const { 713 return name() == vmSymbols::object_initializer_name(); 714 } 715 716 bool Method::needs_clinit_barrier() const { 717 return is_static() && !method_holder()->is_initialized(); 718 } 719 720 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 721 int length = method->checked_exceptions_length(); 722 if (length == 0) { // common case 723 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 724 } else { 725 methodHandle h_this(THREAD, method); 726 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 727 objArrayHandle mirrors (THREAD, m_oop); 728 for (int i = 0; i < length; i++) { 729 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 730 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 731 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 732 mirrors->obj_at_put(i, k->java_mirror()); 733 } 734 return mirrors; 735 } 736 }; 737 738 739 int Method::line_number_from_bci(int bci) const { 740 int best_bci = 0; 741 int best_line = -1; 742 if (bci == SynchronizationEntryBCI) bci = 0; 743 if (0 <= bci && bci < code_size() && has_linenumber_table()) { 744 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 745 // Not necessarily sorted and not necessarily one-to-one. 746 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 747 while (stream.read_pair()) { 748 if (stream.bci() == bci) { 749 // perfect match 750 return stream.line(); 751 } else { 752 // update best_bci/line 753 if (stream.bci() < bci && stream.bci() >= best_bci) { 754 best_bci = stream.bci(); 755 best_line = stream.line(); 756 } 757 } 758 } 759 } 760 return best_line; 761 } 762 763 764 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 765 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 766 Thread *thread = Thread::current(); 767 Symbol* klass_name = constants()->klass_name_at(klass_index); 768 Handle loader(thread, method_holder()->class_loader()); 769 Handle prot (thread, method_holder()->protection_domain()); 770 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 771 } else { 772 return true; 773 } 774 } 775 776 777 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 778 int klass_index = constants()->klass_ref_index_at(refinfo_index); 779 if (must_be_resolved) { 780 // Make sure klass is resolved in constantpool. 781 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 782 } 783 return is_klass_loaded_by_klass_index(klass_index); 784 } 785 786 787 void Method::set_native_function(address function, bool post_event_flag) { 788 assert(function != NULL, "use clear_native_function to unregister natives"); 789 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 790 address* native_function = native_function_addr(); 791 792 // We can see racers trying to place the same native function into place. Once 793 // is plenty. 794 address current = *native_function; 795 if (current == function) return; 796 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 797 function != NULL) { 798 // native_method_throw_unsatisfied_link_error_entry() should only 799 // be passed when post_event_flag is false. 800 assert(function != 801 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 802 "post_event_flag mis-match"); 803 804 // post the bind event, and possible change the bind function 805 JvmtiExport::post_native_method_bind(this, &function); 806 } 807 *native_function = function; 808 // This function can be called more than once. We must make sure that we always 809 // use the latest registered method -> check if a stub already has been generated. 810 // If so, we have to make it not_entrant. 811 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates 812 if (nm != NULL) { 813 nm->make_not_entrant(); 814 } 815 } 816 817 818 bool Method::has_native_function() const { 819 if (is_method_handle_intrinsic()) 820 return false; // special-cased in SharedRuntime::generate_native_wrapper 821 address func = native_function(); 822 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 823 } 824 825 826 void Method::clear_native_function() { 827 // Note: is_method_handle_intrinsic() is allowed here. 828 set_native_function( 829 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 830 !native_bind_event_is_interesting); 831 this->unlink_code(); 832 } 833 834 835 void Method::set_signature_handler(address handler) { 836 address* signature_handler = signature_handler_addr(); 837 *signature_handler = handler; 838 } 839 840 841 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 842 assert(reason != NULL, "must provide a reason"); 843 if (PrintCompilation && report) { 844 ttyLocker ttyl; 845 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 846 if (comp_level == CompLevel_all) { 847 tty->print("all levels "); 848 } else { 849 tty->print("level %d ", comp_level); 850 } 851 this->print_short_name(tty); 852 int size = this->code_size(); 853 if (size > 0) { 854 tty->print(" (%d bytes)", size); 855 } 856 if (reason != NULL) { 857 tty->print(" %s", reason); 858 } 859 tty->cr(); 860 } 861 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 862 ttyLocker ttyl; 863 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 864 os::current_thread_id(), is_osr, comp_level); 865 if (reason != NULL) { 866 xtty->print(" reason=\'%s\'", reason); 867 } 868 xtty->method(this); 869 xtty->stamp(); 870 xtty->end_elem(); 871 } 872 } 873 874 bool Method::is_always_compilable() const { 875 // Generated adapters must be compiled 876 if (is_method_handle_intrinsic() && is_synthetic()) { 877 assert(!is_not_c1_compilable(), "sanity check"); 878 assert(!is_not_c2_compilable(), "sanity check"); 879 return true; 880 } 881 882 return false; 883 } 884 885 bool Method::is_not_compilable(int comp_level) const { 886 if (number_of_breakpoints() > 0) 887 return true; 888 if (is_always_compilable()) 889 return false; 890 if (comp_level == CompLevel_any) 891 return is_not_c1_compilable() || is_not_c2_compilable(); 892 if (is_c1_compile(comp_level)) 893 return is_not_c1_compilable(); 894 if (is_c2_compile(comp_level)) 895 return is_not_c2_compilable(); 896 return false; 897 } 898 899 // call this when compiler finds that this method is not compilable 900 void Method::set_not_compilable(const char* reason, int comp_level, bool report) { 901 if (is_always_compilable()) { 902 // Don't mark a method which should be always compilable 903 return; 904 } 905 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 906 if (comp_level == CompLevel_all) { 907 set_not_c1_compilable(); 908 set_not_c2_compilable(); 909 } else { 910 if (is_c1_compile(comp_level)) 911 set_not_c1_compilable(); 912 if (is_c2_compile(comp_level)) 913 set_not_c2_compilable(); 914 } 915 CompilationPolicy::policy()->disable_compilation(this); 916 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 917 } 918 919 bool Method::is_not_osr_compilable(int comp_level) const { 920 if (is_not_compilable(comp_level)) 921 return true; 922 if (comp_level == CompLevel_any) 923 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 924 if (is_c1_compile(comp_level)) 925 return is_not_c1_osr_compilable(); 926 if (is_c2_compile(comp_level)) 927 return is_not_c2_osr_compilable(); 928 return false; 929 } 930 931 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) { 932 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 933 if (comp_level == CompLevel_all) { 934 set_not_c1_osr_compilable(); 935 set_not_c2_osr_compilable(); 936 } else { 937 if (is_c1_compile(comp_level)) 938 set_not_c1_osr_compilable(); 939 if (is_c2_compile(comp_level)) 940 set_not_c2_osr_compilable(); 941 } 942 CompilationPolicy::policy()->disable_compilation(this); 943 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 944 } 945 946 // Revert to using the interpreter and clear out the nmethod 947 void Method::clear_code() { 948 // this may be NULL if c2i adapters have not been made yet 949 // Only should happen at allocate time. 950 if (adapter() == NULL) { 951 _from_compiled_entry = NULL; 952 } else { 953 _from_compiled_entry = adapter()->get_c2i_entry(); 954 } 955 OrderAccess::storestore(); 956 _from_interpreted_entry = _i2i_entry; 957 OrderAccess::storestore(); 958 _code = NULL; 959 } 960 961 void Method::unlink_code(CompiledMethod *compare) { 962 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 963 // We need to check if either the _code or _from_compiled_code_entry_point 964 // refer to this nmethod because there is a race in setting these two fields 965 // in Method* as seen in bugid 4947125. 966 // If the vep() points to the zombie nmethod, the memory for the nmethod 967 // could be flushed and the compiler and vtable stubs could still call 968 // through it. 969 if (code() == compare || 970 from_compiled_entry() == compare->verified_entry_point()) { 971 clear_code(); 972 } 973 } 974 975 void Method::unlink_code() { 976 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 977 clear_code(); 978 } 979 980 #if INCLUDE_CDS 981 // Called by class data sharing to remove any entry points (which are not shared) 982 void Method::unlink_method() { 983 _code = NULL; 984 985 Arguments::assert_is_dumping_archive(); 986 // Set the values to what they should be at run time. Note that 987 // this Method can no longer be executed during dump time. 988 _i2i_entry = Interpreter::entry_for_cds_method(this); 989 _from_interpreted_entry = _i2i_entry; 990 991 if (DynamicDumpSharedSpaces) { 992 assert(_from_compiled_entry != NULL, "sanity"); 993 } else { 994 // TODO: Simplify the adapter trampoline allocation for static archiving. 995 // Remove the use of CDSAdapterHandlerEntry. 996 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter(); 997 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline()); 998 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline(); 999 assert(*((int*)_from_compiled_entry) == 0, 1000 "must be NULL during dump time, to be initialized at run time"); 1001 } 1002 1003 if (is_native()) { 1004 *native_function_addr() = NULL; 1005 set_signature_handler(NULL); 1006 } 1007 NOT_PRODUCT(set_compiled_invocation_count(0);) 1008 1009 set_method_data(NULL); 1010 clear_method_counters(); 1011 } 1012 #endif 1013 1014 /**************************************************************************** 1015 // The following illustrates how the entries work for CDS shared Methods: 1016 // 1017 // Our goal is to delay writing into a shared Method until it's compiled. 1018 // Hence, we want to determine the initial values for _i2i_entry, 1019 // _from_interpreted_entry and _from_compiled_entry during CDS dump time. 1020 // 1021 // In this example, both Methods A and B have the _i2i_entry of "zero_locals". 1022 // They also have similar signatures so that they will share the same 1023 // AdapterHandlerEntry. 1024 // 1025 // _adapter_trampoline points to a fixed location in the RW section of 1026 // the CDS archive. This location initially contains a NULL pointer. When the 1027 // first of method A or B is linked, an AdapterHandlerEntry is allocated 1028 // dynamically, and its c2i/i2c entries are generated. 1029 // 1030 // _i2i_entry and _from_interpreted_entry initially points to the same 1031 // (fixed) location in the CODE section of the CDS archive. This contains 1032 // an unconditional branch to the actual entry for "zero_locals", which is 1033 // generated at run time and may be on an arbitrary address. Thus, the 1034 // unconditional branch is also generated at run time to jump to the correct 1035 // address. 1036 // 1037 // Similarly, _from_compiled_entry points to a fixed address in the CODE 1038 // section. This address has enough space for an unconditional branch 1039 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is 1040 // initialized, and the address for the actual c2i_entry is known, we emit a 1041 // branch instruction here to branch to the actual c2i_entry. 1042 // 1043 // The effect of the extra branch on the i2i and c2i entries is negligible. 1044 // 1045 // The reason for putting _adapter_trampoline in RO is many shared Methods 1046 // share the same AdapterHandlerEntry, so we can save space in the RW section 1047 // by having the extra indirection. 1048 1049 1050 [Method A: RW] 1051 _constMethod ----> [ConstMethod: RO] 1052 _adapter_trampoline -----------+ 1053 | 1054 _i2i_entry (same value as method B) | 1055 _from_interpreted_entry (same value as method B) | 1056 _from_compiled_entry (same value as method B) | 1057 | 1058 | 1059 [Method B: RW] +--------+ 1060 _constMethod ----> [ConstMethod: RO] | 1061 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+ 1062 | 1063 +-------------------------------+ 1064 | 1065 +----> [AdapterHandlerEntry] (allocated at run time) 1066 _fingerprint 1067 _c2i_entry ---------------------------------+->[c2i entry..] 1068 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] | 1069 _from_interpreted_entry | _c2i_unverified_entry | | 1070 | | _c2i_no_clinit_check_entry| | 1071 | | (_cds_entry_table: CODE) | | 1072 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | | 1073 | | (allocated at run time) | | 1074 | | ... [asm code ...] | | 1075 +-[not compiled]-+ [n]: jmp _entry_table[n] | | 1076 | | | 1077 | | | 1078 +-[compiled]-------------------------------------------------------------------+ | 1079 | 1080 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) | 1081 [jmp c2i_entry] ------------------------------------------------------+ 1082 1083 ***/ 1084 1085 // Called when the method_holder is getting linked. Setup entrypoints so the method 1086 // is ready to be called from interpreter, compiler, and vtables. 1087 void Method::link_method(const methodHandle& h_method, TRAPS) { 1088 // If the code cache is full, we may reenter this function for the 1089 // leftover methods that weren't linked. 1090 if (is_shared()) { 1091 address entry = Interpreter::entry_for_cds_method(h_method); 1092 assert(entry != NULL && entry == _i2i_entry, 1093 "should be correctly set during dump time"); 1094 if (adapter() != NULL) { 1095 return; 1096 } 1097 assert(entry == _from_interpreted_entry, 1098 "should be correctly set during dump time"); 1099 } else if (_i2i_entry != NULL) { 1100 return; 1101 } 1102 assert( _code == NULL, "nothing compiled yet" ); 1103 1104 // Setup interpreter entrypoint 1105 assert(this == h_method(), "wrong h_method()" ); 1106 1107 if (!is_shared()) { 1108 assert(adapter() == NULL, "init'd to NULL"); 1109 address entry = Interpreter::entry_for_method(h_method); 1110 assert(entry != NULL, "interpreter entry must be non-null"); 1111 // Sets both _i2i_entry and _from_interpreted_entry 1112 set_interpreter_entry(entry); 1113 } 1114 1115 // Don't overwrite already registered native entries. 1116 if (is_native() && !has_native_function()) { 1117 set_native_function( 1118 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1119 !native_bind_event_is_interesting); 1120 } 1121 1122 // Setup compiler entrypoint. This is made eagerly, so we do not need 1123 // special handling of vtables. An alternative is to make adapters more 1124 // lazily by calling make_adapter() from from_compiled_entry() for the 1125 // normal calls. For vtable calls life gets more complicated. When a 1126 // call-site goes mega-morphic we need adapters in all methods which can be 1127 // called from the vtable. We need adapters on such methods that get loaded 1128 // later. Ditto for mega-morphic itable calls. If this proves to be a 1129 // problem we'll make these lazily later. 1130 (void) make_adapters(h_method, CHECK); 1131 1132 // ONLY USE the h_method now as make_adapter may have blocked 1133 1134 } 1135 1136 address Method::make_adapters(const methodHandle& mh, TRAPS) { 1137 // Adapters for compiled code are made eagerly here. They are fairly 1138 // small (generally < 100 bytes) and quick to make (and cached and shared) 1139 // so making them eagerly shouldn't be too expensive. 1140 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1141 if (adapter == NULL ) { 1142 if (!is_init_completed()) { 1143 // Don't throw exceptions during VM initialization because java.lang.* classes 1144 // might not have been initialized, causing problems when constructing the 1145 // Java exception object. 1146 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1147 } else { 1148 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters"); 1149 } 1150 } 1151 1152 if (mh->is_shared()) { 1153 assert(mh->adapter() == adapter, "must be"); 1154 assert(mh->_from_compiled_entry != NULL, "must be"); 1155 } else { 1156 mh->set_adapter_entry(adapter); 1157 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1158 } 1159 return adapter->get_c2i_entry(); 1160 } 1161 1162 void Method::restore_unshareable_info(TRAPS) { 1163 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored"); 1164 1165 // Since restore_unshareable_info can be called more than once for a method, don't 1166 // redo any work. 1167 if (adapter() == NULL) { 1168 methodHandle mh(THREAD, this); 1169 link_method(mh, CHECK); 1170 } 1171 } 1172 1173 address Method::from_compiled_entry_no_trampoline() const { 1174 CompiledMethod *code = OrderAccess::load_acquire(&_code); 1175 if (code) { 1176 return code->verified_entry_point(); 1177 } else { 1178 return adapter()->get_c2i_entry(); 1179 } 1180 } 1181 1182 // The verified_code_entry() must be called when a invoke is resolved 1183 // on this method. 1184 1185 // It returns the compiled code entry point, after asserting not null. 1186 // This function is called after potential safepoints so that nmethod 1187 // or adapter that it points to is still live and valid. 1188 // This function must not hit a safepoint! 1189 address Method::verified_code_entry() { 1190 debug_only(NoSafepointVerifier nsv;) 1191 assert(_from_compiled_entry != NULL, "must be set"); 1192 return _from_compiled_entry; 1193 } 1194 1195 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1196 // (could be racing a deopt). 1197 // Not inline to avoid circular ref. 1198 bool Method::check_code() const { 1199 // cached in a register or local. There's a race on the value of the field. 1200 CompiledMethod *code = OrderAccess::load_acquire(&_code); 1201 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 1202 } 1203 1204 // Install compiled code. Instantly it can execute. 1205 void Method::set_code(const methodHandle& mh, CompiledMethod *code) { 1206 assert_lock_strong(CompiledMethod_lock); 1207 assert( code, "use clear_code to remove code" ); 1208 assert( mh->check_code(), "" ); 1209 1210 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 1211 1212 // These writes must happen in this order, because the interpreter will 1213 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1214 // which jumps to _from_compiled_entry. 1215 mh->_code = code; // Assign before allowing compiled code to exec 1216 1217 int comp_level = code->comp_level(); 1218 // In theory there could be a race here. In practice it is unlikely 1219 // and not worth worrying about. 1220 if (comp_level > mh->highest_comp_level()) { 1221 mh->set_highest_comp_level(comp_level); 1222 } 1223 1224 OrderAccess::storestore(); 1225 mh->_from_compiled_entry = code->verified_entry_point(); 1226 OrderAccess::storestore(); 1227 // Instantly compiled code can execute. 1228 if (!mh->is_method_handle_intrinsic()) 1229 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1230 } 1231 1232 1233 bool Method::is_overridden_in(Klass* k) const { 1234 InstanceKlass* ik = InstanceKlass::cast(k); 1235 1236 if (ik->is_interface()) return false; 1237 1238 // If method is an interface, we skip it - except if it 1239 // is a miranda method 1240 if (method_holder()->is_interface()) { 1241 // Check that method is not a miranda method 1242 if (ik->lookup_method(name(), signature()) == NULL) { 1243 // No implementation exist - so miranda method 1244 return false; 1245 } 1246 return true; 1247 } 1248 1249 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1250 if (!has_vtable_index()) { 1251 return false; 1252 } else { 1253 Method* vt_m = ik->method_at_vtable(vtable_index()); 1254 return vt_m != this; 1255 } 1256 } 1257 1258 1259 // give advice about whether this Method* should be cached or not 1260 bool Method::should_not_be_cached() const { 1261 if (is_old()) { 1262 // This method has been redefined. It is either EMCP or obsolete 1263 // and we don't want to cache it because that would pin the method 1264 // down and prevent it from being collectible if and when it 1265 // finishes executing. 1266 return true; 1267 } 1268 1269 // caching this method should be just fine 1270 return false; 1271 } 1272 1273 1274 /** 1275 * Returns true if this is one of the specially treated methods for 1276 * security related stack walks (like Reflection.getCallerClass). 1277 */ 1278 bool Method::is_ignored_by_security_stack_walk() const { 1279 if (intrinsic_id() == vmIntrinsics::_invoke) { 1280 // This is Method.invoke() -- ignore it 1281 return true; 1282 } 1283 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1284 // This is an auxilary frame -- ignore it 1285 return true; 1286 } 1287 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1288 // This is an internal adapter frame for method handles -- ignore it 1289 return true; 1290 } 1291 return false; 1292 } 1293 1294 1295 // Constant pool structure for invoke methods: 1296 enum { 1297 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1298 _imcp_invoke_signature, // utf8: (variable Symbol*) 1299 _imcp_limit 1300 }; 1301 1302 // Test if this method is an MH adapter frame generated by Java code. 1303 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1304 bool Method::is_compiled_lambda_form() const { 1305 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1306 } 1307 1308 // Test if this method is an internal MH primitive method. 1309 bool Method::is_method_handle_intrinsic() const { 1310 vmIntrinsics::ID iid = intrinsic_id(); 1311 return (MethodHandles::is_signature_polymorphic(iid) && 1312 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1313 } 1314 1315 bool Method::has_member_arg() const { 1316 vmIntrinsics::ID iid = intrinsic_id(); 1317 return (MethodHandles::is_signature_polymorphic(iid) && 1318 MethodHandles::has_member_arg(iid)); 1319 } 1320 1321 // Make an instance of a signature-polymorphic internal MH primitive. 1322 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1323 Symbol* signature, 1324 TRAPS) { 1325 ResourceMark rm; 1326 methodHandle empty; 1327 1328 InstanceKlass* holder = SystemDictionary::MethodHandle_klass(); 1329 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1330 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1331 if (TraceMethodHandles) { 1332 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1333 } 1334 1335 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1336 name->increment_refcount(); 1337 signature->increment_refcount(); 1338 1339 int cp_length = _imcp_limit; 1340 ClassLoaderData* loader_data = holder->class_loader_data(); 1341 constantPoolHandle cp; 1342 { 1343 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1344 cp = constantPoolHandle(THREAD, cp_oop); 1345 } 1346 cp->set_pool_holder(holder); 1347 cp->symbol_at_put(_imcp_invoke_name, name); 1348 cp->symbol_at_put(_imcp_invoke_signature, signature); 1349 cp->set_has_preresolution(); 1350 1351 // decide on access bits: public or not? 1352 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1353 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1354 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1355 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1356 1357 methodHandle m; 1358 { 1359 InlineTableSizes sizes; 1360 Method* m_oop = Method::allocate(loader_data, 0, 1361 accessFlags_from(flags_bits), &sizes, 1362 ConstMethod::NORMAL, CHECK_(empty)); 1363 m = methodHandle(THREAD, m_oop); 1364 } 1365 m->set_constants(cp()); 1366 m->set_name_index(_imcp_invoke_name); 1367 m->set_signature_index(_imcp_invoke_signature); 1368 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1369 assert(m->signature() == signature, ""); 1370 ResultTypeFinder rtf(signature); 1371 m->constMethod()->set_result_type(rtf.type()); 1372 m->compute_size_of_parameters(THREAD); 1373 m->init_intrinsic_id(); 1374 assert(m->is_method_handle_intrinsic(), ""); 1375 #ifdef ASSERT 1376 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1377 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1378 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1379 #endif //ASSERT 1380 1381 // Finally, set up its entry points. 1382 assert(m->can_be_statically_bound(), ""); 1383 m->set_vtable_index(Method::nonvirtual_vtable_index); 1384 m->link_method(m, CHECK_(empty)); 1385 1386 if (TraceMethodHandles && (Verbose || WizardMode)) { 1387 ttyLocker ttyl; 1388 m->print_on(tty); 1389 } 1390 1391 return m; 1392 } 1393 1394 Klass* Method::check_non_bcp_klass(Klass* klass) { 1395 if (klass != NULL && klass->class_loader() != NULL) { 1396 if (klass->is_objArray_klass()) 1397 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1398 return klass; 1399 } 1400 return NULL; 1401 } 1402 1403 1404 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, 1405 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1406 // Code below does not work for native methods - they should never get rewritten anyway 1407 assert(!m->is_native(), "cannot rewrite native methods"); 1408 // Allocate new Method* 1409 AccessFlags flags = m->access_flags(); 1410 1411 ConstMethod* cm = m->constMethod(); 1412 int checked_exceptions_len = cm->checked_exceptions_length(); 1413 int localvariable_len = cm->localvariable_table_length(); 1414 int exception_table_len = cm->exception_table_length(); 1415 int method_parameters_len = cm->method_parameters_length(); 1416 int method_annotations_len = cm->method_annotations_length(); 1417 int parameter_annotations_len = cm->parameter_annotations_length(); 1418 int type_annotations_len = cm->type_annotations_length(); 1419 int default_annotations_len = cm->default_annotations_length(); 1420 1421 InlineTableSizes sizes( 1422 localvariable_len, 1423 new_compressed_linenumber_size, 1424 exception_table_len, 1425 checked_exceptions_len, 1426 method_parameters_len, 1427 cm->generic_signature_index(), 1428 method_annotations_len, 1429 parameter_annotations_len, 1430 type_annotations_len, 1431 default_annotations_len, 1432 0); 1433 1434 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1435 Method* newm_oop = Method::allocate(loader_data, 1436 new_code_length, 1437 flags, 1438 &sizes, 1439 m->method_type(), 1440 CHECK_(methodHandle())); 1441 methodHandle newm (THREAD, newm_oop); 1442 1443 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1444 ConstMethod* newcm = newm->constMethod(); 1445 int new_const_method_size = newm->constMethod()->size(); 1446 1447 // This works because the source and target are both Methods. Some compilers 1448 // (e.g., clang) complain that the target vtable pointer will be stomped, 1449 // so cast away newm()'s and m()'s Methodness. 1450 memcpy((void*)newm(), (void*)m(), sizeof(Method)); 1451 1452 // Create shallow copy of ConstMethod. 1453 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1454 1455 // Reset correct method/const method, method size, and parameter info 1456 newm->set_constMethod(newcm); 1457 newm->constMethod()->set_code_size(new_code_length); 1458 newm->constMethod()->set_constMethod_size(new_const_method_size); 1459 assert(newm->code_size() == new_code_length, "check"); 1460 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1461 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1462 assert(newm->exception_table_length() == exception_table_len, "check"); 1463 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1464 // Copy new byte codes 1465 memcpy(newm->code_base(), new_code, new_code_length); 1466 // Copy line number table 1467 if (new_compressed_linenumber_size > 0) { 1468 memcpy(newm->compressed_linenumber_table(), 1469 new_compressed_linenumber_table, 1470 new_compressed_linenumber_size); 1471 } 1472 // Copy method_parameters 1473 if (method_parameters_len > 0) { 1474 memcpy(newm->method_parameters_start(), 1475 m->method_parameters_start(), 1476 method_parameters_len * sizeof(MethodParametersElement)); 1477 } 1478 // Copy checked_exceptions 1479 if (checked_exceptions_len > 0) { 1480 memcpy(newm->checked_exceptions_start(), 1481 m->checked_exceptions_start(), 1482 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1483 } 1484 // Copy exception table 1485 if (exception_table_len > 0) { 1486 memcpy(newm->exception_table_start(), 1487 m->exception_table_start(), 1488 exception_table_len * sizeof(ExceptionTableElement)); 1489 } 1490 // Copy local variable number table 1491 if (localvariable_len > 0) { 1492 memcpy(newm->localvariable_table_start(), 1493 m->localvariable_table_start(), 1494 localvariable_len * sizeof(LocalVariableTableElement)); 1495 } 1496 // Copy stackmap table 1497 if (m->has_stackmap_table()) { 1498 int code_attribute_length = m->stackmap_data()->length(); 1499 Array<u1>* stackmap_data = 1500 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1501 memcpy((void*)stackmap_data->adr_at(0), 1502 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1503 newm->set_stackmap_data(stackmap_data); 1504 } 1505 1506 // copy annotations over to new method 1507 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL); 1508 return newm; 1509 } 1510 1511 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) { 1512 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1513 // because we are not loading from core libraries 1514 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1515 // which does not use the class default class loader so we check for its loader here 1516 const InstanceKlass* ik = InstanceKlass::cast(holder); 1517 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1518 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1519 } 1520 1521 // see if the klass name is well-known: 1522 Symbol* klass_name = ik->name(); 1523 return vmSymbols::find_sid(klass_name); 1524 } 1525 1526 void Method::init_intrinsic_id() { 1527 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1528 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1529 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1530 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1531 1532 // the klass name is well-known: 1533 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1534 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1535 1536 // ditto for method and signature: 1537 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1538 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1539 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1540 && name_id == vmSymbols::NO_SID) { 1541 return; 1542 } 1543 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1544 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1545 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1546 && sig_id == vmSymbols::NO_SID) { 1547 return; 1548 } 1549 jshort flags = access_flags().as_short(); 1550 1551 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1552 if (id != vmIntrinsics::_none) { 1553 set_intrinsic_id(id); 1554 if (id == vmIntrinsics::_Class_cast) { 1555 // Even if the intrinsic is rejected, we want to inline this simple method. 1556 set_force_inline(true); 1557 } 1558 return; 1559 } 1560 1561 // A few slightly irregular cases: 1562 switch (klass_id) { 1563 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1564 // Second chance: check in regular Math. 1565 switch (name_id) { 1566 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1567 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1568 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1569 // pretend it is the corresponding method in the non-strict class: 1570 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1571 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1572 break; 1573 default: 1574 break; 1575 } 1576 break; 1577 1578 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1579 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1580 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1581 if (!is_native()) break; 1582 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1583 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1584 id = vmIntrinsics::_none; 1585 break; 1586 1587 default: 1588 break; 1589 } 1590 1591 if (id != vmIntrinsics::_none) { 1592 // Set up its iid. It is an alias method. 1593 set_intrinsic_id(id); 1594 return; 1595 } 1596 } 1597 1598 // These two methods are static since a GC may move the Method 1599 bool Method::load_signature_classes(const methodHandle& m, TRAPS) { 1600 if (!THREAD->can_call_java()) { 1601 // There is nothing useful this routine can do from within the Compile thread. 1602 // Hopefully, the signature contains only well-known classes. 1603 // We could scan for this and return true/false, but the caller won't care. 1604 return false; 1605 } 1606 bool sig_is_loaded = true; 1607 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1608 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1609 ResourceMark rm(THREAD); 1610 Symbol* signature = m->signature(); 1611 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1612 if (ss.is_object()) { 1613 Symbol* sym = ss.as_symbol(); 1614 Symbol* name = sym; 1615 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1616 protection_domain, THREAD); 1617 // We are loading classes eagerly. If a ClassNotFoundException or 1618 // a LinkageError was generated, be sure to ignore it. 1619 if (HAS_PENDING_EXCEPTION) { 1620 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1621 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1622 CLEAR_PENDING_EXCEPTION; 1623 } else { 1624 return false; 1625 } 1626 } 1627 if( klass == NULL) { sig_is_loaded = false; } 1628 } 1629 } 1630 return sig_is_loaded; 1631 } 1632 1633 bool Method::has_unloaded_classes_in_signature(const methodHandle& m, TRAPS) { 1634 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1635 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1636 ResourceMark rm(THREAD); 1637 Symbol* signature = m->signature(); 1638 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1639 if (ss.type() == T_OBJECT) { 1640 Symbol* name = ss.as_symbol_or_null(); 1641 if (name == NULL) return true; 1642 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1643 if (klass == NULL) return true; 1644 } 1645 } 1646 return false; 1647 } 1648 1649 // Exposed so field engineers can debug VM 1650 void Method::print_short_name(outputStream* st) { 1651 ResourceMark rm; 1652 #ifdef PRODUCT 1653 st->print(" %s::", method_holder()->external_name()); 1654 #else 1655 st->print(" %s::", method_holder()->internal_name()); 1656 #endif 1657 name()->print_symbol_on(st); 1658 if (WizardMode) signature()->print_symbol_on(st); 1659 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1660 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1661 } 1662 1663 // Comparer for sorting an object array containing 1664 // Method*s. 1665 static int method_comparator(Method* a, Method* b) { 1666 return a->name()->fast_compare(b->name()); 1667 } 1668 1669 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1670 // default_methods also uses this without the ordering for fast find_method 1671 void Method::sort_methods(Array<Method*>* methods, bool set_idnums, method_comparator_func func) { 1672 int length = methods->length(); 1673 if (length > 1) { 1674 if (func == NULL) { 1675 func = method_comparator; 1676 } 1677 { 1678 NoSafepointVerifier nsv; 1679 QuickSort::sort(methods->data(), length, func, /*idempotent=*/false); 1680 } 1681 // Reset method ordering 1682 if (set_idnums) { 1683 for (int i = 0; i < length; i++) { 1684 Method* m = methods->at(i); 1685 m->set_method_idnum(i); 1686 m->set_orig_method_idnum(i); 1687 } 1688 } 1689 } 1690 } 1691 1692 //----------------------------------------------------------------------------------- 1693 // Non-product code unless JVM/TI needs it 1694 1695 #if !defined(PRODUCT) || INCLUDE_JVMTI 1696 class SignatureTypePrinter : public SignatureTypeNames { 1697 private: 1698 outputStream* _st; 1699 bool _use_separator; 1700 1701 void type_name(const char* name) { 1702 if (_use_separator) _st->print(", "); 1703 _st->print("%s", name); 1704 _use_separator = true; 1705 } 1706 1707 public: 1708 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1709 _st = st; 1710 _use_separator = false; 1711 } 1712 1713 void print_parameters() { _use_separator = false; iterate_parameters(); } 1714 void print_returntype() { _use_separator = false; iterate_returntype(); } 1715 }; 1716 1717 1718 void Method::print_name(outputStream* st) { 1719 Thread *thread = Thread::current(); 1720 ResourceMark rm(thread); 1721 st->print("%s ", is_static() ? "static" : "virtual"); 1722 if (WizardMode) { 1723 st->print("%s.", method_holder()->internal_name()); 1724 name()->print_symbol_on(st); 1725 signature()->print_symbol_on(st); 1726 } else { 1727 SignatureTypePrinter sig(signature(), st); 1728 sig.print_returntype(); 1729 st->print(" %s.", method_holder()->internal_name()); 1730 name()->print_symbol_on(st); 1731 st->print("("); 1732 sig.print_parameters(); 1733 st->print(")"); 1734 } 1735 } 1736 #endif // !PRODUCT || INCLUDE_JVMTI 1737 1738 1739 void Method::print_codes_on(outputStream* st) const { 1740 print_codes_on(0, code_size(), st); 1741 } 1742 1743 void Method::print_codes_on(int from, int to, outputStream* st) const { 1744 Thread *thread = Thread::current(); 1745 ResourceMark rm(thread); 1746 methodHandle mh (thread, (Method*)this); 1747 BytecodeStream s(mh); 1748 s.set_interval(from, to); 1749 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1750 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1751 } 1752 1753 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1754 _bci = 0; 1755 _line = 0; 1756 }; 1757 1758 bool CompressedLineNumberReadStream::read_pair() { 1759 jubyte next = read_byte(); 1760 // Check for terminator 1761 if (next == 0) return false; 1762 if (next == 0xFF) { 1763 // Escape character, regular compression used 1764 _bci += read_signed_int(); 1765 _line += read_signed_int(); 1766 } else { 1767 // Single byte compression used 1768 _bci += next >> 3; 1769 _line += next & 0x7; 1770 } 1771 return true; 1772 } 1773 1774 #if INCLUDE_JVMTI 1775 1776 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1777 BreakpointInfo* bp = method_holder()->breakpoints(); 1778 for (; bp != NULL; bp = bp->next()) { 1779 if (bp->match(this, bci)) { 1780 return bp->orig_bytecode(); 1781 } 1782 } 1783 { 1784 ResourceMark rm; 1785 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1786 } 1787 return Bytecodes::_shouldnotreachhere; 1788 } 1789 1790 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1791 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1792 BreakpointInfo* bp = method_holder()->breakpoints(); 1793 for (; bp != NULL; bp = bp->next()) { 1794 if (bp->match(this, bci)) { 1795 bp->set_orig_bytecode(code); 1796 // and continue, in case there is more than one 1797 } 1798 } 1799 } 1800 1801 void Method::set_breakpoint(int bci) { 1802 InstanceKlass* ik = method_holder(); 1803 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1804 bp->set_next(ik->breakpoints()); 1805 ik->set_breakpoints(bp); 1806 // do this last: 1807 bp->set(this); 1808 } 1809 1810 static void clear_matches(Method* m, int bci) { 1811 InstanceKlass* ik = m->method_holder(); 1812 BreakpointInfo* prev_bp = NULL; 1813 BreakpointInfo* next_bp; 1814 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1815 next_bp = bp->next(); 1816 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1817 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1818 // do this first: 1819 bp->clear(m); 1820 // unhook it 1821 if (prev_bp != NULL) 1822 prev_bp->set_next(next_bp); 1823 else 1824 ik->set_breakpoints(next_bp); 1825 delete bp; 1826 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1827 // at same location. So we have multiple matching (method_index and bci) 1828 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1829 // breakpoint for clear_breakpoint request and keep all other method versions 1830 // BreakpointInfo for future clear_breakpoint request. 1831 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1832 // which is being called when class is unloaded. We delete all the Breakpoint 1833 // information for all versions of method. We may not correctly restore the original 1834 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1835 // so these methods won't be used anymore. 1836 if (bci >= 0) { 1837 break; 1838 } 1839 } else { 1840 // This one is a keeper. 1841 prev_bp = bp; 1842 } 1843 } 1844 } 1845 1846 void Method::clear_breakpoint(int bci) { 1847 assert(bci >= 0, ""); 1848 clear_matches(this, bci); 1849 } 1850 1851 void Method::clear_all_breakpoints() { 1852 clear_matches(this, -1); 1853 } 1854 1855 #endif // INCLUDE_JVMTI 1856 1857 int Method::invocation_count() { 1858 MethodCounters *mcs = method_counters(); 1859 if (TieredCompilation) { 1860 MethodData* const mdo = method_data(); 1861 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1862 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1863 return InvocationCounter::count_limit; 1864 } else { 1865 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1866 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1867 } 1868 } else { 1869 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1870 } 1871 } 1872 1873 int Method::backedge_count() { 1874 MethodCounters *mcs = method_counters(); 1875 if (TieredCompilation) { 1876 MethodData* const mdo = method_data(); 1877 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1878 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1879 return InvocationCounter::count_limit; 1880 } else { 1881 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1882 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1883 } 1884 } else { 1885 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1886 } 1887 } 1888 1889 int Method::highest_comp_level() const { 1890 const MethodCounters* mcs = method_counters(); 1891 if (mcs != NULL) { 1892 return mcs->highest_comp_level(); 1893 } else { 1894 return CompLevel_none; 1895 } 1896 } 1897 1898 int Method::highest_osr_comp_level() const { 1899 const MethodCounters* mcs = method_counters(); 1900 if (mcs != NULL) { 1901 return mcs->highest_osr_comp_level(); 1902 } else { 1903 return CompLevel_none; 1904 } 1905 } 1906 1907 void Method::set_highest_comp_level(int level) { 1908 MethodCounters* mcs = method_counters(); 1909 if (mcs != NULL) { 1910 mcs->set_highest_comp_level(level); 1911 } 1912 } 1913 1914 void Method::set_highest_osr_comp_level(int level) { 1915 MethodCounters* mcs = method_counters(); 1916 if (mcs != NULL) { 1917 mcs->set_highest_osr_comp_level(level); 1918 } 1919 } 1920 1921 #if INCLUDE_JVMTI 1922 1923 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1924 _bci = bci; 1925 _name_index = m->name_index(); 1926 _signature_index = m->signature_index(); 1927 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1928 if (_orig_bytecode == Bytecodes::_breakpoint) 1929 _orig_bytecode = m->orig_bytecode_at(_bci); 1930 _next = NULL; 1931 } 1932 1933 void BreakpointInfo::set(Method* method) { 1934 #ifdef ASSERT 1935 { 1936 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1937 if (code == Bytecodes::_breakpoint) 1938 code = method->orig_bytecode_at(_bci); 1939 assert(orig_bytecode() == code, "original bytecode must be the same"); 1940 } 1941 #endif 1942 Thread *thread = Thread::current(); 1943 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1944 method->incr_number_of_breakpoints(thread); 1945 { 1946 // Deoptimize all dependents on this method 1947 HandleMark hm(thread); 1948 methodHandle mh(thread, method); 1949 CodeCache::flush_dependents_on_method(mh); 1950 } 1951 } 1952 1953 void BreakpointInfo::clear(Method* method) { 1954 *method->bcp_from(_bci) = orig_bytecode(); 1955 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1956 method->decr_number_of_breakpoints(Thread::current()); 1957 } 1958 1959 #endif // INCLUDE_JVMTI 1960 1961 // jmethodID handling 1962 1963 // This is a block allocating object, sort of like JNIHandleBlock, only a 1964 // lot simpler. 1965 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1966 // never get rid of it. 1967 1968 static const int min_block_size = 8; 1969 1970 class JNIMethodBlockNode : public CHeapObj<mtClass> { 1971 friend class JNIMethodBlock; 1972 Method** _methods; 1973 int _number_of_methods; 1974 int _top; 1975 JNIMethodBlockNode* _next; 1976 1977 public: 1978 1979 JNIMethodBlockNode(int num_methods = min_block_size); 1980 1981 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 1982 1983 void ensure_methods(int num_addl_methods) { 1984 if (_top < _number_of_methods) { 1985 num_addl_methods -= _number_of_methods - _top; 1986 if (num_addl_methods <= 0) { 1987 return; 1988 } 1989 } 1990 if (_next == NULL) { 1991 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 1992 } else { 1993 _next->ensure_methods(num_addl_methods); 1994 } 1995 } 1996 }; 1997 1998 class JNIMethodBlock : public CHeapObj<mtClass> { 1999 JNIMethodBlockNode _head; 2000 JNIMethodBlockNode *_last_free; 2001 public: 2002 static Method* const _free_method; 2003 2004 JNIMethodBlock(int initial_capacity = min_block_size) 2005 : _head(initial_capacity), _last_free(&_head) {} 2006 2007 void ensure_methods(int num_addl_methods) { 2008 _last_free->ensure_methods(num_addl_methods); 2009 } 2010 2011 Method** add_method(Method* m) { 2012 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) { 2013 if (b->_top < b->_number_of_methods) { 2014 // top points to the next free entry. 2015 int i = b->_top; 2016 b->_methods[i] = m; 2017 b->_top++; 2018 _last_free = b; 2019 return &(b->_methods[i]); 2020 } else if (b->_top == b->_number_of_methods) { 2021 // if the next free entry ran off the block see if there's a free entry 2022 for (int i = 0; i < b->_number_of_methods; i++) { 2023 if (b->_methods[i] == _free_method) { 2024 b->_methods[i] = m; 2025 _last_free = b; 2026 return &(b->_methods[i]); 2027 } 2028 } 2029 // Only check each block once for frees. They're very unlikely. 2030 // Increment top past the end of the block. 2031 b->_top++; 2032 } 2033 // need to allocate a next block. 2034 if (b->_next == NULL) { 2035 b->_next = _last_free = new JNIMethodBlockNode(); 2036 } 2037 } 2038 guarantee(false, "Should always allocate a free block"); 2039 return NULL; 2040 } 2041 2042 bool contains(Method** m) { 2043 if (m == NULL) return false; 2044 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2045 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2046 // This is a bit of extra checking, for two reasons. One is 2047 // that contains() deals with pointers that are passed in by 2048 // JNI code, so making sure that the pointer is aligned 2049 // correctly is valuable. The other is that <= and > are 2050 // technically not defined on pointers, so the if guard can 2051 // pass spuriously; no modern compiler is likely to make that 2052 // a problem, though (and if one did, the guard could also 2053 // fail spuriously, which would be bad). 2054 ptrdiff_t idx = m - b->_methods; 2055 if (b->_methods + idx == m) { 2056 return true; 2057 } 2058 } 2059 } 2060 return false; // not found 2061 } 2062 2063 // Doesn't really destroy it, just marks it as free so it can be reused. 2064 void destroy_method(Method** m) { 2065 #ifdef ASSERT 2066 assert(contains(m), "should be a methodID"); 2067 #endif // ASSERT 2068 *m = _free_method; 2069 } 2070 2071 // During class unloading the methods are cleared, which is different 2072 // than freed. 2073 void clear_all_methods() { 2074 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2075 for (int i = 0; i< b->_number_of_methods; i++) { 2076 b->_methods[i] = NULL; 2077 } 2078 } 2079 } 2080 #ifndef PRODUCT 2081 int count_methods() { 2082 // count all allocated methods 2083 int count = 0; 2084 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2085 for (int i = 0; i< b->_number_of_methods; i++) { 2086 if (b->_methods[i] != _free_method) count++; 2087 } 2088 } 2089 return count; 2090 } 2091 #endif // PRODUCT 2092 }; 2093 2094 // Something that can't be mistaken for an address or a markWord 2095 Method* const JNIMethodBlock::_free_method = (Method*)55; 2096 2097 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(NULL) { 2098 _number_of_methods = MAX2(num_methods, min_block_size); 2099 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2100 for (int i = 0; i < _number_of_methods; i++) { 2101 _methods[i] = JNIMethodBlock::_free_method; 2102 } 2103 } 2104 2105 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) { 2106 ClassLoaderData* cld = loader_data; 2107 if (!SafepointSynchronize::is_at_safepoint()) { 2108 // Have to add jmethod_ids() to class loader data thread-safely. 2109 // Also have to add the method to the list safely, which the cld lock 2110 // protects as well. 2111 MutexLocker ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2112 if (cld->jmethod_ids() == NULL) { 2113 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2114 } else { 2115 cld->jmethod_ids()->ensure_methods(capacity); 2116 } 2117 } else { 2118 // At safepoint, we are single threaded and can set this. 2119 if (cld->jmethod_ids() == NULL) { 2120 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2121 } else { 2122 cld->jmethod_ids()->ensure_methods(capacity); 2123 } 2124 } 2125 } 2126 2127 // Add a method id to the jmethod_ids 2128 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 2129 ClassLoaderData* cld = loader_data; 2130 2131 if (!SafepointSynchronize::is_at_safepoint()) { 2132 // Have to add jmethod_ids() to class loader data thread-safely. 2133 // Also have to add the method to the list safely, which the cld lock 2134 // protects as well. 2135 MutexLocker ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2136 if (cld->jmethod_ids() == NULL) { 2137 cld->set_jmethod_ids(new JNIMethodBlock()); 2138 } 2139 // jmethodID is a pointer to Method* 2140 return (jmethodID)cld->jmethod_ids()->add_method(m); 2141 } else { 2142 // At safepoint, we are single threaded and can set this. 2143 if (cld->jmethod_ids() == NULL) { 2144 cld->set_jmethod_ids(new JNIMethodBlock()); 2145 } 2146 // jmethodID is a pointer to Method* 2147 return (jmethodID)cld->jmethod_ids()->add_method(m); 2148 } 2149 } 2150 2151 // Mark a jmethodID as free. This is called when there is a data race in 2152 // InstanceKlass while creating the jmethodID cache. 2153 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 2154 ClassLoaderData* cld = loader_data; 2155 Method** ptr = (Method**)m; 2156 assert(cld->jmethod_ids() != NULL, "should have method handles"); 2157 cld->jmethod_ids()->destroy_method(ptr); 2158 } 2159 2160 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2161 // Can't assert the method_holder is the same because the new method has the 2162 // scratch method holder. 2163 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2164 == new_method->method_holder()->class_loader() || 2165 new_method->method_holder()->class_loader() == NULL, // allow Unsafe substitution 2166 "changing to a different class loader"); 2167 // Just change the method in place, jmethodID pointer doesn't change. 2168 *((Method**)jmid) = new_method; 2169 } 2170 2171 bool Method::is_method_id(jmethodID mid) { 2172 Method* m = resolve_jmethod_id(mid); 2173 assert(m != NULL, "should be called with non-null method"); 2174 InstanceKlass* ik = m->method_holder(); 2175 ClassLoaderData* cld = ik->class_loader_data(); 2176 if (cld->jmethod_ids() == NULL) return false; 2177 return (cld->jmethod_ids()->contains((Method**)mid)); 2178 } 2179 2180 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2181 if (mid == NULL) return NULL; 2182 Method* o = resolve_jmethod_id(mid); 2183 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 2184 return NULL; 2185 } 2186 return o; 2187 }; 2188 2189 void Method::set_on_stack(const bool value) { 2190 // Set both the method itself and its constant pool. The constant pool 2191 // on stack means some method referring to it is also on the stack. 2192 constants()->set_on_stack(value); 2193 2194 bool already_set = on_stack(); 2195 _access_flags.set_on_stack(value); 2196 if (value && !already_set) { 2197 MetadataOnStackMark::record(this); 2198 } 2199 assert(!value || !is_old() || is_obsolete() || is_running_emcp(), 2200 "emcp methods cannot run after emcp bit is cleared"); 2201 } 2202 2203 // Called when the class loader is unloaded to make all methods weak. 2204 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2205 loader_data->jmethod_ids()->clear_all_methods(); 2206 } 2207 2208 bool Method::has_method_vptr(const void* ptr) { 2209 Method m; 2210 // This assumes that the vtbl pointer is the first word of a C++ object. 2211 return dereference_vptr(&m) == dereference_vptr(ptr); 2212 } 2213 2214 // Check that this pointer is valid by checking that the vtbl pointer matches 2215 bool Method::is_valid_method(const Method* m) { 2216 if (m == NULL) { 2217 return false; 2218 } else if ((intptr_t(m) & (wordSize-1)) != 0) { 2219 // Quick sanity check on pointer. 2220 return false; 2221 } else if (m->is_shared()) { 2222 return MetaspaceShared::is_valid_shared_method(m); 2223 } else if (Metaspace::contains_non_shared(m)) { 2224 return has_method_vptr((const void*)m); 2225 } else { 2226 return false; 2227 } 2228 } 2229 2230 #ifndef PRODUCT 2231 void Method::print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) { 2232 out->print(" jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 2233 } 2234 #endif // PRODUCT 2235 2236 2237 // Printing 2238 2239 #ifndef PRODUCT 2240 2241 void Method::print_on(outputStream* st) const { 2242 ResourceMark rm; 2243 assert(is_method(), "must be method"); 2244 st->print_cr("%s", internal_name()); 2245 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this)); 2246 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2247 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants())); 2248 constants()->print_value_on(st); st->cr(); 2249 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2250 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2251 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2252 st->print_cr(" - max stack: %d", max_stack()); 2253 st->print_cr(" - max locals: %d", max_locals()); 2254 st->print_cr(" - size of params: %d", size_of_parameters()); 2255 st->print_cr(" - method size: %d", method_size()); 2256 if (intrinsic_id() != vmIntrinsics::_none) 2257 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 2258 if (highest_comp_level() != CompLevel_none) 2259 st->print_cr(" - highest level: %d", highest_comp_level()); 2260 st->print_cr(" - vtable index: %d", _vtable_index); 2261 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry())); 2262 st->print( " - adapters: "); 2263 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2264 if (a == NULL) 2265 st->print_cr(INTPTR_FORMAT, p2i(a)); 2266 else 2267 a->print_adapter_on(st); 2268 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry())); 2269 st->print_cr(" - code size: %d", code_size()); 2270 if (code_size() != 0) { 2271 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base())); 2272 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size())); 2273 } 2274 if (method_data() != NULL) { 2275 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data())); 2276 } 2277 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2278 if (checked_exceptions_length() > 0) { 2279 CheckedExceptionElement* table = checked_exceptions_start(); 2280 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table)); 2281 if (Verbose) { 2282 for (int i = 0; i < checked_exceptions_length(); i++) { 2283 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2284 } 2285 } 2286 } 2287 if (has_linenumber_table()) { 2288 u_char* table = compressed_linenumber_table(); 2289 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table)); 2290 if (Verbose) { 2291 CompressedLineNumberReadStream stream(table); 2292 while (stream.read_pair()) { 2293 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2294 } 2295 } 2296 } 2297 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2298 if (localvariable_table_length() > 0) { 2299 LocalVariableTableElement* table = localvariable_table_start(); 2300 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table)); 2301 if (Verbose) { 2302 for (int i = 0; i < localvariable_table_length(); i++) { 2303 int bci = table[i].start_bci; 2304 int len = table[i].length; 2305 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2306 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2307 int slot = table[i].slot; 2308 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2309 } 2310 } 2311 } 2312 if (code() != NULL) { 2313 st->print (" - compiled code: "); 2314 code()->print_value_on(st); 2315 } 2316 if (is_native()) { 2317 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function())); 2318 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler())); 2319 } 2320 } 2321 2322 void Method::print_linkage_flags(outputStream* st) { 2323 access_flags().print_on(st); 2324 if (is_default_method()) { 2325 st->print("default "); 2326 } 2327 if (is_overpass()) { 2328 st->print("overpass "); 2329 } 2330 } 2331 #endif //PRODUCT 2332 2333 void Method::print_value_on(outputStream* st) const { 2334 assert(is_method(), "must be method"); 2335 st->print("%s", internal_name()); 2336 print_address_on(st); 2337 st->print(" "); 2338 name()->print_value_on(st); 2339 st->print(" "); 2340 signature()->print_value_on(st); 2341 st->print(" in "); 2342 method_holder()->print_value_on(st); 2343 if (WizardMode) st->print("#%d", _vtable_index); 2344 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2345 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2346 } 2347 2348 #if INCLUDE_SERVICES 2349 // Size Statistics 2350 void Method::collect_statistics(KlassSizeStats *sz) const { 2351 int mysize = sz->count(this); 2352 sz->_method_bytes += mysize; 2353 sz->_method_all_bytes += mysize; 2354 sz->_rw_bytes += mysize; 2355 2356 if (constMethod()) { 2357 constMethod()->collect_statistics(sz); 2358 } 2359 if (method_data()) { 2360 method_data()->collect_statistics(sz); 2361 } 2362 } 2363 #endif // INCLUDE_SERVICES 2364 2365 // LogTouchedMethods and PrintTouchedMethods 2366 2367 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because 2368 // the Method may be garbage collected. Let's roll our own hash table. 2369 class TouchedMethodRecord : CHeapObj<mtTracing> { 2370 public: 2371 // It's OK to store Symbols here because they will NOT be GC'ed if 2372 // LogTouchedMethods is enabled. 2373 TouchedMethodRecord* _next; 2374 Symbol* _class_name; 2375 Symbol* _method_name; 2376 Symbol* _method_signature; 2377 }; 2378 2379 static const int TOUCHED_METHOD_TABLE_SIZE = 20011; 2380 static TouchedMethodRecord** _touched_method_table = NULL; 2381 2382 void Method::log_touched(TRAPS) { 2383 2384 const int table_size = TOUCHED_METHOD_TABLE_SIZE; 2385 Symbol* my_class = klass_name(); 2386 Symbol* my_name = name(); 2387 Symbol* my_sig = signature(); 2388 2389 unsigned int hash = my_class->identity_hash() + 2390 my_name->identity_hash() + 2391 my_sig->identity_hash(); 2392 juint index = juint(hash) % table_size; 2393 2394 MutexLocker ml(TouchedMethodLog_lock, THREAD); 2395 if (_touched_method_table == NULL) { 2396 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size, 2397 mtTracing, CURRENT_PC); 2398 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size); 2399 } 2400 2401 TouchedMethodRecord* ptr = _touched_method_table[index]; 2402 while (ptr) { 2403 if (ptr->_class_name == my_class && 2404 ptr->_method_name == my_name && 2405 ptr->_method_signature == my_sig) { 2406 return; 2407 } 2408 if (ptr->_next == NULL) break; 2409 ptr = ptr->_next; 2410 } 2411 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing); 2412 my_class->increment_refcount(); 2413 my_name->increment_refcount(); 2414 my_sig->increment_refcount(); 2415 nptr->_class_name = my_class; 2416 nptr->_method_name = my_name; 2417 nptr->_method_signature = my_sig; 2418 nptr->_next = NULL; 2419 2420 if (ptr == NULL) { 2421 // first 2422 _touched_method_table[index] = nptr; 2423 } else { 2424 ptr->_next = nptr; 2425 } 2426 } 2427 2428 void Method::print_touched_methods(outputStream* out) { 2429 MutexLocker ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock); 2430 out->print_cr("# Method::print_touched_methods version 1"); 2431 if (_touched_method_table) { 2432 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) { 2433 TouchedMethodRecord* ptr = _touched_method_table[i]; 2434 while(ptr) { 2435 ptr->_class_name->print_symbol_on(out); out->print("."); 2436 ptr->_method_name->print_symbol_on(out); out->print(":"); 2437 ptr->_method_signature->print_symbol_on(out); out->cr(); 2438 ptr = ptr->_next; 2439 } 2440 } 2441 } 2442 } 2443 2444 // Verification 2445 2446 void Method::verify_on(outputStream* st) { 2447 guarantee(is_method(), "object must be method"); 2448 guarantee(constants()->is_constantPool(), "should be constant pool"); 2449 MethodData* md = method_data(); 2450 guarantee(md == NULL || 2451 md->is_methodData(), "should be method data"); 2452 }