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 "compiler/compilationPolicy.hpp" 32 #include "gc/shared/collectedHeap.inline.hpp" 33 #include "interpreter/bytecodeStream.hpp" 34 #include "interpreter/bytecodeTracer.hpp" 35 #include "interpreter/bytecodes.hpp" 36 #include "interpreter/interpreter.hpp" 37 #include "interpreter/oopMapCache.hpp" 38 #include "memory/allocation.inline.hpp" 39 #include "memory/heapInspection.hpp" 40 #include "memory/metadataFactory.hpp" 41 #include "memory/metaspaceClosure.hpp" 42 #include "memory/metaspaceShared.hpp" 43 #include "memory/oopFactory.hpp" 44 #include "memory/resourceArea.hpp" 45 #include "memory/universe.hpp" 46 #include "oops/constMethod.hpp" 47 #include "oops/constantPool.hpp" 48 #include "oops/method.inline.hpp" 49 #include "oops/methodData.hpp" 50 #include "oops/objArrayKlass.hpp" 51 #include "oops/objArrayOop.inline.hpp" 52 #include "oops/oop.inline.hpp" 53 #include "oops/symbol.hpp" 54 #include "prims/jvmtiExport.hpp" 55 #include "prims/methodHandles.hpp" 56 #include "prims/nativeLookup.hpp" 57 #include "runtime/arguments.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 MetadataFactory::free_metadata(loader_data, method_data()); 122 set_method_data(NULL); 123 MetadataFactory::free_metadata(loader_data, method_counters()); 124 clear_method_counters(); 125 // The nmethod will be gone when we get here. 126 if (code() != NULL) _code = NULL; 127 } 128 129 void Method::release_C_heap_structures() { 130 if (method_data()) { 131 #if INCLUDE_JVMCI 132 FailedSpeculation::free_failed_speculations(method_data()->get_failed_speculations_address()); 133 #endif 134 // Destroy MethodData 135 method_data()->~MethodData(); 136 } 137 } 138 139 address Method::get_i2c_entry() { 140 assert(adapter() != NULL, "must have"); 141 return adapter()->get_i2c_entry(); 142 } 143 144 address Method::get_c2i_entry() { 145 assert(adapter() != NULL, "must have"); 146 return adapter()->get_c2i_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_no_clinit_check_entry() { 155 assert(VM_Version::supports_fast_class_init_checks(), ""); 156 assert(adapter() != NULL, "must have"); 157 return adapter()->get_c2i_no_clinit_check_entry(); 158 } 159 160 char* Method::name_and_sig_as_C_string() const { 161 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 162 } 163 164 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 165 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 166 } 167 168 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 169 const char* klass_name = klass->external_name(); 170 int klass_name_len = (int)strlen(klass_name); 171 int method_name_len = method_name->utf8_length(); 172 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 173 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 174 strcpy(dest, klass_name); 175 dest[klass_name_len] = '.'; 176 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 177 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 178 dest[len] = 0; 179 return dest; 180 } 181 182 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 183 Symbol* klass_name = klass->name(); 184 klass_name->as_klass_external_name(buf, size); 185 int len = (int)strlen(buf); 186 187 if (len < size - 1) { 188 buf[len++] = '.'; 189 190 method_name->as_C_string(&(buf[len]), size - len); 191 len = (int)strlen(buf); 192 193 signature->as_C_string(&(buf[len]), size - len); 194 } 195 196 return buf; 197 } 198 199 const char* Method::external_name() const { 200 return external_name(constants()->pool_holder(), name(), signature()); 201 } 202 203 void Method::print_external_name(outputStream *os) const { 204 print_external_name(os, constants()->pool_holder(), name(), signature()); 205 } 206 207 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) { 208 stringStream ss; 209 print_external_name(&ss, klass, method_name, signature); 210 return ss.as_string(); 211 } 212 213 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) { 214 signature->print_as_signature_external_return_type(os); 215 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string()); 216 signature->print_as_signature_external_parameters(os); 217 os->print(")"); 218 } 219 220 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) { 221 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 222 // access exception table 223 ExceptionTable table(mh()); 224 int length = table.length(); 225 // iterate through all entries sequentially 226 constantPoolHandle pool(THREAD, mh->constants()); 227 for (int i = 0; i < length; i ++) { 228 //reacquire the table in case a GC happened 229 ExceptionTable table(mh()); 230 int beg_bci = table.start_pc(i); 231 int end_bci = table.end_pc(i); 232 assert(beg_bci <= end_bci, "inconsistent exception table"); 233 if (beg_bci <= throw_bci && throw_bci < end_bci) { 234 // exception handler bci range covers throw_bci => investigate further 235 int handler_bci = table.handler_pc(i); 236 int klass_index = table.catch_type_index(i); 237 if (klass_index == 0) { 238 return handler_bci; 239 } else if (ex_klass == NULL) { 240 return handler_bci; 241 } else { 242 // we know the exception class => get the constraint class 243 // this may require loading of the constraint class; if verification 244 // fails or some other exception occurs, return handler_bci 245 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); 246 assert(k != NULL, "klass not loaded"); 247 if (ex_klass->is_subtype_of(k)) { 248 return handler_bci; 249 } 250 } 251 } 252 } 253 254 return -1; 255 } 256 257 void Method::mask_for(int bci, InterpreterOopMap* mask) { 258 methodHandle h_this(Thread::current(), this); 259 // Only GC uses the OopMapCache during thread stack root scanning 260 // any other uses generate an oopmap but do not save it in the cache. 261 if (Universe::heap()->is_gc_active()) { 262 method_holder()->mask_for(h_this, bci, mask); 263 } else { 264 OopMapCache::compute_one_oop_map(h_this, bci, mask); 265 } 266 return; 267 } 268 269 270 int Method::bci_from(address bcp) const { 271 if (is_native() && bcp == 0) { 272 return 0; 273 } 274 #ifdef ASSERT 275 { 276 ResourceMark rm; 277 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(), 278 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", 279 p2i(bcp), name_and_sig_as_C_string()); 280 } 281 #endif 282 return bcp - code_base(); 283 } 284 285 286 int Method::validate_bci(int bci) const { 287 return (bci == 0 || bci < code_size()) ? bci : -1; 288 } 289 290 // Return bci if it appears to be a valid bcp 291 // Return -1 otherwise. 292 // Used by profiling code, when invalid data is a possibility. 293 // The caller is responsible for validating the Method* itself. 294 int Method::validate_bci_from_bcp(address bcp) const { 295 // keep bci as -1 if not a valid bci 296 int bci = -1; 297 if (bcp == 0 || bcp == code_base()) { 298 // code_size() may return 0 and we allow 0 here 299 // the method may be native 300 bci = 0; 301 } else if (contains(bcp)) { 302 bci = bcp - code_base(); 303 } 304 // Assert that if we have dodged any asserts, bci is negative. 305 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 306 return bci; 307 } 308 309 address Method::bcp_from(int bci) const { 310 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), 311 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native"); 312 address bcp = code_base() + bci; 313 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 314 return bcp; 315 } 316 317 address Method::bcp_from(address bcp) const { 318 if (is_native() && bcp == NULL) { 319 return code_base(); 320 } else { 321 return bcp; 322 } 323 } 324 325 int Method::size(bool is_native) { 326 // If native, then include pointers for native_function and signature_handler 327 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 328 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord; 329 return align_metadata_size(header_size() + extra_words); 330 } 331 332 333 Symbol* Method::klass_name() const { 334 return method_holder()->name(); 335 } 336 337 338 void Method::metaspace_pointers_do(MetaspaceClosure* it) { 339 log_trace(cds)("Iter(Method): %p", this); 340 341 it->push(&_constMethod); 342 it->push(&_method_data); 343 it->push(&_method_counters); 344 } 345 346 // Attempt to return method oop to original state. Clear any pointers 347 // (to objects outside the shared spaces). We won't be able to predict 348 // where they should point in a new JVM. Further initialize some 349 // entries now in order allow them to be write protected later. 350 351 void Method::remove_unshareable_info() { 352 unlink_method(); 353 } 354 355 void Method::set_vtable_index(int index) { 356 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 357 // At runtime initialize_vtable is rerun as part of link_class_impl() 358 // for a shared class loaded by the non-boot loader to obtain the loader 359 // constraints based on the runtime classloaders' context. 360 return; // don't write into the shared class 361 } else { 362 _vtable_index = index; 363 } 364 } 365 366 void Method::set_itable_index(int index) { 367 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 368 // At runtime initialize_itable is rerun as part of link_class_impl() 369 // for a shared class loaded by the non-boot loader to obtain the loader 370 // constraints based on the runtime classloaders' context. The dumptime 371 // itable index should be the same as the runtime index. 372 assert(_vtable_index == itable_index_max - index, 373 "archived itable index is different from runtime index"); 374 return; // don’t write into the shared class 375 } else { 376 _vtable_index = itable_index_max - index; 377 } 378 assert(valid_itable_index(), ""); 379 } 380 381 382 383 bool Method::was_executed_more_than(int n) { 384 // Invocation counter is reset when the Method* is compiled. 385 // If the method has compiled code we therefore assume it has 386 // be excuted more than n times. 387 if (is_accessor() || is_empty_method() || (code() != NULL)) { 388 // interpreter doesn't bump invocation counter of trivial methods 389 // compiler does not bump invocation counter of compiled methods 390 return true; 391 } 392 else if ((method_counters() != NULL && 393 method_counters()->invocation_counter()->carry()) || 394 (method_data() != NULL && 395 method_data()->invocation_counter()->carry())) { 396 // The carry bit is set when the counter overflows and causes 397 // a compilation to occur. We don't know how many times 398 // the counter has been reset, so we simply assume it has 399 // been executed more than n times. 400 return true; 401 } else { 402 return invocation_count() > n; 403 } 404 } 405 406 void Method::print_invocation_count() { 407 if (is_static()) tty->print("static "); 408 if (is_final()) tty->print("final "); 409 if (is_synchronized()) tty->print("synchronized "); 410 if (is_native()) tty->print("native "); 411 tty->print("%s::", method_holder()->external_name()); 412 name()->print_symbol_on(tty); 413 signature()->print_symbol_on(tty); 414 415 if (WizardMode) { 416 // dump the size of the byte codes 417 tty->print(" {%d}", code_size()); 418 } 419 tty->cr(); 420 421 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 422 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 423 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 424 #ifndef PRODUCT 425 if (CountCompiledCalls) { 426 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 427 } 428 #endif 429 } 430 431 // Build a MethodData* object to hold information about this method 432 // collected in the interpreter. 433 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) { 434 // Do not profile the method if metaspace has hit an OOM previously 435 // allocating profiling data. Callers clear pending exception so don't 436 // add one here. 437 if (ClassLoaderDataGraph::has_metaspace_oom()) { 438 return; 439 } 440 441 // Grab a lock here to prevent multiple 442 // MethodData*s from being created. 443 MutexLocker ml(MethodData_lock, THREAD); 444 if (method->method_data() == NULL) { 445 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 446 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 447 if (HAS_PENDING_EXCEPTION) { 448 CompileBroker::log_metaspace_failure(); 449 ClassLoaderDataGraph::set_metaspace_oom(true); 450 return; // return the exception (which is cleared) 451 } 452 453 method->set_method_data(method_data); 454 if (PrintMethodData && (Verbose || WizardMode)) { 455 ResourceMark rm(THREAD); 456 tty->print("build_interpreter_method_data for "); 457 method->print_name(tty); 458 tty->cr(); 459 // At the end of the run, the MDO, full of data, will be dumped. 460 } 461 } 462 } 463 464 MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 465 // Do not profile the method if metaspace has hit an OOM previously 466 if (ClassLoaderDataGraph::has_metaspace_oom()) { 467 return NULL; 468 } 469 470 methodHandle mh(m); 471 MethodCounters* counters = MethodCounters::allocate(mh, THREAD); 472 if (HAS_PENDING_EXCEPTION) { 473 CompileBroker::log_metaspace_failure(); 474 ClassLoaderDataGraph::set_metaspace_oom(true); 475 return NULL; // return the exception (which is cleared) 476 } 477 if (!mh->init_method_counters(counters)) { 478 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 479 } 480 481 if (LogTouchedMethods) { 482 mh->log_touched(CHECK_NULL); 483 } 484 485 return mh->method_counters(); 486 } 487 488 bool Method::init_method_counters(MethodCounters* counters) { 489 // Try to install a pointer to MethodCounters, return true on success. 490 return Atomic::replace_if_null(counters, &_method_counters); 491 } 492 493 int Method::extra_stack_words() { 494 // not an inline function, to avoid a header dependency on Interpreter 495 return extra_stack_entries() * Interpreter::stackElementSize; 496 } 497 498 499 void Method::compute_size_of_parameters(Thread *thread) { 500 ArgumentSizeComputer asc(signature()); 501 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 502 } 503 504 BasicType Method::result_type() const { 505 ResultTypeFinder rtf(signature()); 506 return rtf.type(); 507 } 508 509 510 bool Method::is_empty_method() const { 511 return code_size() == 1 512 && *code_base() == Bytecodes::_return; 513 } 514 515 516 bool Method::is_vanilla_constructor() const { 517 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 518 // which only calls the superclass vanilla constructor and possibly does stores of 519 // zero constants to local fields: 520 // 521 // aload_0 522 // invokespecial 523 // indexbyte1 524 // indexbyte2 525 // 526 // followed by an (optional) sequence of: 527 // 528 // aload_0 529 // aconst_null / iconst_0 / fconst_0 / dconst_0 530 // putfield 531 // indexbyte1 532 // indexbyte2 533 // 534 // followed by: 535 // 536 // return 537 538 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 539 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 540 int size = code_size(); 541 // Check if size match 542 if (size == 0 || size % 5 != 0) return false; 543 address cb = code_base(); 544 int last = size - 1; 545 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 546 // Does not call superclass default constructor 547 return false; 548 } 549 // Check optional sequence 550 for (int i = 4; i < last; i += 5) { 551 if (cb[i] != Bytecodes::_aload_0) return false; 552 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 553 if (cb[i+2] != Bytecodes::_putfield) return false; 554 } 555 return true; 556 } 557 558 559 bool Method::compute_has_loops_flag() { 560 BytecodeStream bcs(this); 561 Bytecodes::Code bc; 562 563 while ((bc = bcs.next()) >= 0) { 564 switch( bc ) { 565 case Bytecodes::_ifeq: 566 case Bytecodes::_ifnull: 567 case Bytecodes::_iflt: 568 case Bytecodes::_ifle: 569 case Bytecodes::_ifne: 570 case Bytecodes::_ifnonnull: 571 case Bytecodes::_ifgt: 572 case Bytecodes::_ifge: 573 case Bytecodes::_if_icmpeq: 574 case Bytecodes::_if_icmpne: 575 case Bytecodes::_if_icmplt: 576 case Bytecodes::_if_icmpgt: 577 case Bytecodes::_if_icmple: 578 case Bytecodes::_if_icmpge: 579 case Bytecodes::_if_acmpeq: 580 case Bytecodes::_if_acmpne: 581 case Bytecodes::_goto: 582 case Bytecodes::_jsr: 583 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 584 break; 585 586 case Bytecodes::_goto_w: 587 case Bytecodes::_jsr_w: 588 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 589 break; 590 591 default: 592 break; 593 } 594 } 595 _access_flags.set_loops_flag_init(); 596 return _access_flags.has_loops(); 597 } 598 599 bool Method::is_final_method(AccessFlags class_access_flags) const { 600 // or "does_not_require_vtable_entry" 601 // default method or overpass can occur, is not final (reuses vtable entry) 602 // private methods in classes get vtable entries for backward class compatibility. 603 if (is_overpass() || is_default_method()) return false; 604 return is_final() || class_access_flags.is_final(); 605 } 606 607 bool Method::is_final_method() const { 608 return is_final_method(method_holder()->access_flags()); 609 } 610 611 bool Method::is_default_method() const { 612 if (method_holder() != NULL && 613 method_holder()->is_interface() && 614 !is_abstract() && !is_private()) { 615 return true; 616 } else { 617 return false; 618 } 619 } 620 621 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 622 if (is_final_method(class_access_flags)) return true; 623 #ifdef ASSERT 624 ResourceMark rm; 625 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 626 if (class_access_flags.is_interface()) { 627 assert(is_nonv == is_static() || is_nonv == is_private(), 628 "nonvirtual unexpected for non-static, non-private: %s", 629 name_and_sig_as_C_string()); 630 } 631 #endif 632 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 633 return vtable_index() == nonvirtual_vtable_index; 634 } 635 636 bool Method::can_be_statically_bound() const { 637 return can_be_statically_bound(method_holder()->access_flags()); 638 } 639 640 bool Method::can_be_statically_bound(InstanceKlass* context) const { 641 return (method_holder() == context) && can_be_statically_bound(); 642 } 643 644 bool Method::is_accessor() const { 645 return is_getter() || is_setter(); 646 } 647 648 bool Method::is_getter() const { 649 if (code_size() != 5) return false; 650 if (size_of_parameters() != 1) return false; 651 if (java_code_at(0) != Bytecodes::_aload_0) return false; 652 if (java_code_at(1) != Bytecodes::_getfield) return false; 653 switch (java_code_at(4)) { 654 case Bytecodes::_ireturn: 655 case Bytecodes::_lreturn: 656 case Bytecodes::_freturn: 657 case Bytecodes::_dreturn: 658 case Bytecodes::_areturn: 659 break; 660 default: 661 return false; 662 } 663 return true; 664 } 665 666 bool Method::is_setter() const { 667 if (code_size() != 6) return false; 668 if (java_code_at(0) != Bytecodes::_aload_0) return false; 669 switch (java_code_at(1)) { 670 case Bytecodes::_iload_1: 671 case Bytecodes::_aload_1: 672 case Bytecodes::_fload_1: 673 if (size_of_parameters() != 2) return false; 674 break; 675 case Bytecodes::_dload_1: 676 case Bytecodes::_lload_1: 677 if (size_of_parameters() != 3) return false; 678 break; 679 default: 680 return false; 681 } 682 if (java_code_at(2) != Bytecodes::_putfield) return false; 683 if (java_code_at(5) != Bytecodes::_return) return false; 684 return true; 685 } 686 687 bool Method::is_constant_getter() const { 688 int last_index = code_size() - 1; 689 // Check if the first 1-3 bytecodes are a constant push 690 // and the last bytecode is a return. 691 return (2 <= code_size() && code_size() <= 4 && 692 Bytecodes::is_const(java_code_at(0)) && 693 Bytecodes::length_for(java_code_at(0)) == last_index && 694 Bytecodes::is_return(java_code_at(last_index))); 695 } 696 697 bool Method::is_initializer() const { 698 return is_object_initializer() || is_static_initializer(); 699 } 700 701 bool Method::has_valid_initializer_flags() const { 702 return (is_static() || 703 method_holder()->major_version() < 51); 704 } 705 706 bool Method::is_static_initializer() const { 707 // For classfiles version 51 or greater, ensure that the clinit method is 708 // static. Non-static methods with the name "<clinit>" are not static 709 // initializers. (older classfiles exempted for backward compatibility) 710 return name() == vmSymbols::class_initializer_name() && 711 has_valid_initializer_flags(); 712 } 713 714 bool Method::is_object_initializer() const { 715 return name() == vmSymbols::object_initializer_name(); 716 } 717 718 bool Method::needs_clinit_barrier() const { 719 return is_static() && !method_holder()->is_initialized(); 720 } 721 722 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 723 int length = method->checked_exceptions_length(); 724 if (length == 0) { // common case 725 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 726 } else { 727 methodHandle h_this(THREAD, method); 728 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 729 objArrayHandle mirrors (THREAD, m_oop); 730 for (int i = 0; i < length; i++) { 731 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 732 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 733 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 734 mirrors->obj_at_put(i, k->java_mirror()); 735 } 736 return mirrors; 737 } 738 }; 739 740 741 int Method::line_number_from_bci(int bci) const { 742 int best_bci = 0; 743 int best_line = -1; 744 if (bci == SynchronizationEntryBCI) bci = 0; 745 if (0 <= bci && bci < code_size() && has_linenumber_table()) { 746 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 747 // Not necessarily sorted and not necessarily one-to-one. 748 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 749 while (stream.read_pair()) { 750 if (stream.bci() == bci) { 751 // perfect match 752 return stream.line(); 753 } else { 754 // update best_bci/line 755 if (stream.bci() < bci && stream.bci() >= best_bci) { 756 best_bci = stream.bci(); 757 best_line = stream.line(); 758 } 759 } 760 } 761 } 762 return best_line; 763 } 764 765 766 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 767 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 768 Thread *thread = Thread::current(); 769 Symbol* klass_name = constants()->klass_name_at(klass_index); 770 Handle loader(thread, method_holder()->class_loader()); 771 Handle prot (thread, method_holder()->protection_domain()); 772 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 773 } else { 774 return true; 775 } 776 } 777 778 779 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 780 int klass_index = constants()->klass_ref_index_at(refinfo_index); 781 if (must_be_resolved) { 782 // Make sure klass is resolved in constantpool. 783 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 784 } 785 return is_klass_loaded_by_klass_index(klass_index); 786 } 787 788 789 void Method::set_native_function(address function, bool post_event_flag) { 790 assert(function != NULL, "use clear_native_function to unregister natives"); 791 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 792 address* native_function = native_function_addr(); 793 794 // We can see racers trying to place the same native function into place. Once 795 // is plenty. 796 address current = *native_function; 797 if (current == function) return; 798 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 799 function != NULL) { 800 // native_method_throw_unsatisfied_link_error_entry() should only 801 // be passed when post_event_flag is false. 802 assert(function != 803 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 804 "post_event_flag mis-match"); 805 806 // post the bind event, and possible change the bind function 807 JvmtiExport::post_native_method_bind(this, &function); 808 } 809 *native_function = function; 810 // This function can be called more than once. We must make sure that we always 811 // use the latest registered method -> check if a stub already has been generated. 812 // If so, we have to make it not_entrant. 813 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates 814 if (nm != NULL) { 815 nm->make_not_entrant(); 816 } 817 } 818 819 820 bool Method::has_native_function() const { 821 if (is_method_handle_intrinsic()) 822 return false; // special-cased in SharedRuntime::generate_native_wrapper 823 address func = native_function(); 824 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 825 } 826 827 828 void Method::clear_native_function() { 829 // Note: is_method_handle_intrinsic() is allowed here. 830 set_native_function( 831 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 832 !native_bind_event_is_interesting); 833 this->unlink_code(); 834 } 835 836 837 void Method::set_signature_handler(address handler) { 838 address* signature_handler = signature_handler_addr(); 839 *signature_handler = handler; 840 } 841 842 843 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 844 assert(reason != NULL, "must provide a reason"); 845 if (PrintCompilation && report) { 846 ttyLocker ttyl; 847 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 848 if (comp_level == CompLevel_all) { 849 tty->print("all levels "); 850 } else { 851 tty->print("level %d ", comp_level); 852 } 853 this->print_short_name(tty); 854 int size = this->code_size(); 855 if (size > 0) { 856 tty->print(" (%d bytes)", size); 857 } 858 if (reason != NULL) { 859 tty->print(" %s", reason); 860 } 861 tty->cr(); 862 } 863 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 864 ttyLocker ttyl; 865 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 866 os::current_thread_id(), is_osr, comp_level); 867 if (reason != NULL) { 868 xtty->print(" reason=\'%s\'", reason); 869 } 870 xtty->method(this); 871 xtty->stamp(); 872 xtty->end_elem(); 873 } 874 } 875 876 bool Method::is_always_compilable() const { 877 // Generated adapters must be compiled 878 if (is_method_handle_intrinsic() && is_synthetic()) { 879 assert(!is_not_c1_compilable(), "sanity check"); 880 assert(!is_not_c2_compilable(), "sanity check"); 881 return true; 882 } 883 884 return false; 885 } 886 887 bool Method::is_not_compilable(int comp_level) const { 888 if (number_of_breakpoints() > 0) 889 return true; 890 if (is_always_compilable()) 891 return false; 892 if (comp_level == CompLevel_any) 893 return is_not_c1_compilable() || is_not_c2_compilable(); 894 if (is_c1_compile(comp_level)) 895 return is_not_c1_compilable(); 896 if (is_c2_compile(comp_level)) 897 return is_not_c2_compilable(); 898 return false; 899 } 900 901 // call this when compiler finds that this method is not compilable 902 void Method::set_not_compilable(const char* reason, int comp_level, bool report) { 903 if (is_always_compilable()) { 904 // Don't mark a method which should be always compilable 905 return; 906 } 907 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 908 if (comp_level == CompLevel_all) { 909 set_not_c1_compilable(); 910 set_not_c2_compilable(); 911 } else { 912 if (is_c1_compile(comp_level)) 913 set_not_c1_compilable(); 914 if (is_c2_compile(comp_level)) 915 set_not_c2_compilable(); 916 } 917 CompilationPolicy::policy()->disable_compilation(this); 918 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 919 } 920 921 bool Method::is_not_osr_compilable(int comp_level) const { 922 if (is_not_compilable(comp_level)) 923 return true; 924 if (comp_level == CompLevel_any) 925 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 926 if (is_c1_compile(comp_level)) 927 return is_not_c1_osr_compilable(); 928 if (is_c2_compile(comp_level)) 929 return is_not_c2_osr_compilable(); 930 return false; 931 } 932 933 void Method::set_not_osr_compilable(const char* reason, int comp_level, bool report) { 934 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 935 if (comp_level == CompLevel_all) { 936 set_not_c1_osr_compilable(); 937 set_not_c2_osr_compilable(); 938 } else { 939 if (is_c1_compile(comp_level)) 940 set_not_c1_osr_compilable(); 941 if (is_c2_compile(comp_level)) 942 set_not_c2_osr_compilable(); 943 } 944 CompilationPolicy::policy()->disable_compilation(this); 945 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 946 } 947 948 // Revert to using the interpreter and clear out the nmethod 949 void Method::clear_code() { 950 // this may be NULL if c2i adapters have not been made yet 951 // Only should happen at allocate time. 952 if (adapter() == NULL) { 953 _from_compiled_entry = NULL; 954 } else { 955 _from_compiled_entry = adapter()->get_c2i_entry(); 956 } 957 OrderAccess::storestore(); 958 _from_interpreted_entry = _i2i_entry; 959 OrderAccess::storestore(); 960 _code = NULL; 961 } 962 963 void Method::unlink_code(CompiledMethod *compare) { 964 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 965 // We need to check if either the _code or _from_compiled_code_entry_point 966 // refer to this nmethod because there is a race in setting these two fields 967 // in Method* as seen in bugid 4947125. 968 // If the vep() points to the zombie nmethod, the memory for the nmethod 969 // could be flushed and the compiler and vtable stubs could still call 970 // through it. 971 if (code() == compare || 972 from_compiled_entry() == compare->verified_entry_point()) { 973 clear_code(); 974 } 975 } 976 977 void Method::unlink_code() { 978 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 979 clear_code(); 980 } 981 982 #if INCLUDE_CDS 983 // Called by class data sharing to remove any entry points (which are not shared) 984 void Method::unlink_method() { 985 _code = NULL; 986 987 Arguments::assert_is_dumping_archive(); 988 // Set the values to what they should be at run time. Note that 989 // this Method can no longer be executed during dump time. 990 _i2i_entry = Interpreter::entry_for_cds_method(this); 991 _from_interpreted_entry = _i2i_entry; 992 993 if (DynamicDumpSharedSpaces) { 994 assert(_from_compiled_entry != NULL, "sanity"); 995 } else { 996 // TODO: Simplify the adapter trampoline allocation for static archiving. 997 // Remove the use of CDSAdapterHandlerEntry. 998 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter(); 999 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline()); 1000 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline(); 1001 assert(*((int*)_from_compiled_entry) == 0, 1002 "must be NULL during dump time, to be initialized at run time"); 1003 } 1004 1005 if (is_native()) { 1006 *native_function_addr() = NULL; 1007 set_signature_handler(NULL); 1008 } 1009 NOT_PRODUCT(set_compiled_invocation_count(0);) 1010 1011 set_method_data(NULL); 1012 clear_method_counters(); 1013 } 1014 #endif 1015 1016 /**************************************************************************** 1017 // The following illustrates how the entries work for CDS shared Methods: 1018 // 1019 // Our goal is to delay writing into a shared Method until it's compiled. 1020 // Hence, we want to determine the initial values for _i2i_entry, 1021 // _from_interpreted_entry and _from_compiled_entry during CDS dump time. 1022 // 1023 // In this example, both Methods A and B have the _i2i_entry of "zero_locals". 1024 // They also have similar signatures so that they will share the same 1025 // AdapterHandlerEntry. 1026 // 1027 // _adapter_trampoline points to a fixed location in the RW section of 1028 // the CDS archive. This location initially contains a NULL pointer. When the 1029 // first of method A or B is linked, an AdapterHandlerEntry is allocated 1030 // dynamically, and its c2i/i2c entries are generated. 1031 // 1032 // _i2i_entry and _from_interpreted_entry initially points to the same 1033 // (fixed) location in the CODE section of the CDS archive. This contains 1034 // an unconditional branch to the actual entry for "zero_locals", which is 1035 // generated at run time and may be on an arbitrary address. Thus, the 1036 // unconditional branch is also generated at run time to jump to the correct 1037 // address. 1038 // 1039 // Similarly, _from_compiled_entry points to a fixed address in the CODE 1040 // section. This address has enough space for an unconditional branch 1041 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is 1042 // initialized, and the address for the actual c2i_entry is known, we emit a 1043 // branch instruction here to branch to the actual c2i_entry. 1044 // 1045 // The effect of the extra branch on the i2i and c2i entries is negligible. 1046 // 1047 // The reason for putting _adapter_trampoline in RO is many shared Methods 1048 // share the same AdapterHandlerEntry, so we can save space in the RW section 1049 // by having the extra indirection. 1050 1051 1052 [Method A: RW] 1053 _constMethod ----> [ConstMethod: RO] 1054 _adapter_trampoline -----------+ 1055 | 1056 _i2i_entry (same value as method B) | 1057 _from_interpreted_entry (same value as method B) | 1058 _from_compiled_entry (same value as method B) | 1059 | 1060 | 1061 [Method B: RW] +--------+ 1062 _constMethod ----> [ConstMethod: RO] | 1063 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+ 1064 | 1065 +-------------------------------+ 1066 | 1067 +----> [AdapterHandlerEntry] (allocated at run time) 1068 _fingerprint 1069 _c2i_entry ---------------------------------+->[c2i entry..] 1070 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] | 1071 _from_interpreted_entry | _c2i_unverified_entry | | 1072 | | _c2i_no_clinit_check_entry| | 1073 | | (_cds_entry_table: CODE) | | 1074 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | | 1075 | | (allocated at run time) | | 1076 | | ... [asm code ...] | | 1077 +-[not compiled]-+ [n]: jmp _entry_table[n] | | 1078 | | | 1079 | | | 1080 +-[compiled]-------------------------------------------------------------------+ | 1081 | 1082 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) | 1083 [jmp c2i_entry] ------------------------------------------------------+ 1084 1085 ***/ 1086 1087 // Called when the method_holder is getting linked. Setup entrypoints so the method 1088 // is ready to be called from interpreter, compiler, and vtables. 1089 void Method::link_method(const methodHandle& h_method, TRAPS) { 1090 // If the code cache is full, we may reenter this function for the 1091 // leftover methods that weren't linked. 1092 if (is_shared()) { 1093 address entry = Interpreter::entry_for_cds_method(h_method); 1094 assert(entry != NULL && entry == _i2i_entry, 1095 "should be correctly set during dump time"); 1096 if (adapter() != NULL) { 1097 return; 1098 } 1099 assert(entry == _from_interpreted_entry, 1100 "should be correctly set during dump time"); 1101 } else if (_i2i_entry != NULL) { 1102 return; 1103 } 1104 assert( _code == NULL, "nothing compiled yet" ); 1105 1106 // Setup interpreter entrypoint 1107 assert(this == h_method(), "wrong h_method()" ); 1108 1109 if (!is_shared()) { 1110 assert(adapter() == NULL, "init'd to NULL"); 1111 address entry = Interpreter::entry_for_method(h_method); 1112 assert(entry != NULL, "interpreter entry must be non-null"); 1113 // Sets both _i2i_entry and _from_interpreted_entry 1114 set_interpreter_entry(entry); 1115 } 1116 1117 // Don't overwrite already registered native entries. 1118 if (is_native() && !has_native_function()) { 1119 set_native_function( 1120 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1121 !native_bind_event_is_interesting); 1122 } 1123 1124 // Setup compiler entrypoint. This is made eagerly, so we do not need 1125 // special handling of vtables. An alternative is to make adapters more 1126 // lazily by calling make_adapter() from from_compiled_entry() for the 1127 // normal calls. For vtable calls life gets more complicated. When a 1128 // call-site goes mega-morphic we need adapters in all methods which can be 1129 // called from the vtable. We need adapters on such methods that get loaded 1130 // later. Ditto for mega-morphic itable calls. If this proves to be a 1131 // problem we'll make these lazily later. 1132 (void) make_adapters(h_method, CHECK); 1133 1134 // ONLY USE the h_method now as make_adapter may have blocked 1135 1136 } 1137 1138 address Method::make_adapters(const methodHandle& mh, TRAPS) { 1139 // Adapters for compiled code are made eagerly here. They are fairly 1140 // small (generally < 100 bytes) and quick to make (and cached and shared) 1141 // so making them eagerly shouldn't be too expensive. 1142 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1143 if (adapter == NULL ) { 1144 if (!is_init_completed()) { 1145 // Don't throw exceptions during VM initialization because java.lang.* classes 1146 // might not have been initialized, causing problems when constructing the 1147 // Java exception object. 1148 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1149 } else { 1150 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters"); 1151 } 1152 } 1153 1154 if (mh->is_shared()) { 1155 assert(mh->adapter() == adapter, "must be"); 1156 assert(mh->_from_compiled_entry != NULL, "must be"); 1157 } else { 1158 mh->set_adapter_entry(adapter); 1159 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1160 } 1161 return adapter->get_c2i_entry(); 1162 } 1163 1164 void Method::restore_unshareable_info(TRAPS) { 1165 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored"); 1166 1167 // Since restore_unshareable_info can be called more than once for a method, don't 1168 // redo any work. 1169 if (adapter() == NULL) { 1170 methodHandle mh(THREAD, this); 1171 link_method(mh, CHECK); 1172 } 1173 } 1174 1175 address Method::from_compiled_entry_no_trampoline() const { 1176 CompiledMethod *code = OrderAccess::load_acquire(&_code); 1177 if (code) { 1178 return code->verified_entry_point(); 1179 } else { 1180 return adapter()->get_c2i_entry(); 1181 } 1182 } 1183 1184 // The verified_code_entry() must be called when a invoke is resolved 1185 // on this method. 1186 1187 // It returns the compiled code entry point, after asserting not null. 1188 // This function is called after potential safepoints so that nmethod 1189 // or adapter that it points to is still live and valid. 1190 // This function must not hit a safepoint! 1191 address Method::verified_code_entry() { 1192 debug_only(NoSafepointVerifier nsv;) 1193 assert(_from_compiled_entry != NULL, "must be set"); 1194 return _from_compiled_entry; 1195 } 1196 1197 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1198 // (could be racing a deopt). 1199 // Not inline to avoid circular ref. 1200 bool Method::check_code() const { 1201 // cached in a register or local. There's a race on the value of the field. 1202 CompiledMethod *code = OrderAccess::load_acquire(&_code); 1203 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 1204 } 1205 1206 // Install compiled code. Instantly it can execute. 1207 void Method::set_code(const methodHandle& mh, CompiledMethod *code) { 1208 assert_lock_strong(CompiledMethod_lock); 1209 assert( code, "use clear_code to remove code" ); 1210 assert( mh->check_code(), "" ); 1211 1212 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 1213 1214 // These writes must happen in this order, because the interpreter will 1215 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1216 // which jumps to _from_compiled_entry. 1217 mh->_code = code; // Assign before allowing compiled code to exec 1218 1219 int comp_level = code->comp_level(); 1220 // In theory there could be a race here. In practice it is unlikely 1221 // and not worth worrying about. 1222 if (comp_level > mh->highest_comp_level()) { 1223 mh->set_highest_comp_level(comp_level); 1224 } 1225 1226 OrderAccess::storestore(); 1227 mh->_from_compiled_entry = code->verified_entry_point(); 1228 OrderAccess::storestore(); 1229 // Instantly compiled code can execute. 1230 if (!mh->is_method_handle_intrinsic()) 1231 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1232 } 1233 1234 1235 bool Method::is_overridden_in(Klass* k) const { 1236 InstanceKlass* ik = InstanceKlass::cast(k); 1237 1238 if (ik->is_interface()) return false; 1239 1240 // If method is an interface, we skip it - except if it 1241 // is a miranda method 1242 if (method_holder()->is_interface()) { 1243 // Check that method is not a miranda method 1244 if (ik->lookup_method(name(), signature()) == NULL) { 1245 // No implementation exist - so miranda method 1246 return false; 1247 } 1248 return true; 1249 } 1250 1251 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1252 if (!has_vtable_index()) { 1253 return false; 1254 } else { 1255 Method* vt_m = ik->method_at_vtable(vtable_index()); 1256 return vt_m != this; 1257 } 1258 } 1259 1260 1261 // give advice about whether this Method* should be cached or not 1262 bool Method::should_not_be_cached() const { 1263 if (is_old()) { 1264 // This method has been redefined. It is either EMCP or obsolete 1265 // and we don't want to cache it because that would pin the method 1266 // down and prevent it from being collectible if and when it 1267 // finishes executing. 1268 return true; 1269 } 1270 1271 // caching this method should be just fine 1272 return false; 1273 } 1274 1275 1276 /** 1277 * Returns true if this is one of the specially treated methods for 1278 * security related stack walks (like Reflection.getCallerClass). 1279 */ 1280 bool Method::is_ignored_by_security_stack_walk() const { 1281 if (intrinsic_id() == vmIntrinsics::_invoke) { 1282 // This is Method.invoke() -- ignore it 1283 return true; 1284 } 1285 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1286 // This is an auxilary frame -- ignore it 1287 return true; 1288 } 1289 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1290 // This is an internal adapter frame for method handles -- ignore it 1291 return true; 1292 } 1293 return false; 1294 } 1295 1296 1297 // Constant pool structure for invoke methods: 1298 enum { 1299 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1300 _imcp_invoke_signature, // utf8: (variable Symbol*) 1301 _imcp_limit 1302 }; 1303 1304 // Test if this method is an MH adapter frame generated by Java code. 1305 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1306 bool Method::is_compiled_lambda_form() const { 1307 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1308 } 1309 1310 // Test if this method is an internal MH primitive method. 1311 bool Method::is_method_handle_intrinsic() const { 1312 vmIntrinsics::ID iid = intrinsic_id(); 1313 return (MethodHandles::is_signature_polymorphic(iid) && 1314 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1315 } 1316 1317 bool Method::has_member_arg() const { 1318 vmIntrinsics::ID iid = intrinsic_id(); 1319 return (MethodHandles::is_signature_polymorphic(iid) && 1320 MethodHandles::has_member_arg(iid)); 1321 } 1322 1323 // Make an instance of a signature-polymorphic internal MH primitive. 1324 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1325 Symbol* signature, 1326 TRAPS) { 1327 ResourceMark rm; 1328 methodHandle empty; 1329 1330 InstanceKlass* holder = SystemDictionary::MethodHandle_klass(); 1331 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1332 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1333 if (TraceMethodHandles) { 1334 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1335 } 1336 1337 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1338 name->increment_refcount(); 1339 signature->increment_refcount(); 1340 1341 int cp_length = _imcp_limit; 1342 ClassLoaderData* loader_data = holder->class_loader_data(); 1343 constantPoolHandle cp; 1344 { 1345 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1346 cp = constantPoolHandle(THREAD, cp_oop); 1347 } 1348 cp->set_pool_holder(holder); 1349 cp->symbol_at_put(_imcp_invoke_name, name); 1350 cp->symbol_at_put(_imcp_invoke_signature, signature); 1351 cp->set_has_preresolution(); 1352 1353 // decide on access bits: public or not? 1354 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1355 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1356 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1357 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1358 1359 methodHandle m; 1360 { 1361 InlineTableSizes sizes; 1362 Method* m_oop = Method::allocate(loader_data, 0, 1363 accessFlags_from(flags_bits), &sizes, 1364 ConstMethod::NORMAL, CHECK_(empty)); 1365 m = methodHandle(THREAD, m_oop); 1366 } 1367 m->set_constants(cp()); 1368 m->set_name_index(_imcp_invoke_name); 1369 m->set_signature_index(_imcp_invoke_signature); 1370 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1371 assert(m->signature() == signature, ""); 1372 ResultTypeFinder rtf(signature); 1373 m->constMethod()->set_result_type(rtf.type()); 1374 m->compute_size_of_parameters(THREAD); 1375 m->init_intrinsic_id(); 1376 assert(m->is_method_handle_intrinsic(), ""); 1377 #ifdef ASSERT 1378 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1379 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1380 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1381 #endif //ASSERT 1382 1383 // Finally, set up its entry points. 1384 assert(m->can_be_statically_bound(), ""); 1385 m->set_vtable_index(Method::nonvirtual_vtable_index); 1386 m->link_method(m, CHECK_(empty)); 1387 1388 if (TraceMethodHandles && (Verbose || WizardMode)) { 1389 ttyLocker ttyl; 1390 m->print_on(tty); 1391 } 1392 1393 return m; 1394 } 1395 1396 Klass* Method::check_non_bcp_klass(Klass* klass) { 1397 if (klass != NULL && klass->class_loader() != NULL) { 1398 if (klass->is_objArray_klass()) 1399 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1400 return klass; 1401 } 1402 return NULL; 1403 } 1404 1405 1406 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, 1407 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1408 // Code below does not work for native methods - they should never get rewritten anyway 1409 assert(!m->is_native(), "cannot rewrite native methods"); 1410 // Allocate new Method* 1411 AccessFlags flags = m->access_flags(); 1412 1413 ConstMethod* cm = m->constMethod(); 1414 int checked_exceptions_len = cm->checked_exceptions_length(); 1415 int localvariable_len = cm->localvariable_table_length(); 1416 int exception_table_len = cm->exception_table_length(); 1417 int method_parameters_len = cm->method_parameters_length(); 1418 int method_annotations_len = cm->method_annotations_length(); 1419 int parameter_annotations_len = cm->parameter_annotations_length(); 1420 int type_annotations_len = cm->type_annotations_length(); 1421 int default_annotations_len = cm->default_annotations_length(); 1422 1423 InlineTableSizes sizes( 1424 localvariable_len, 1425 new_compressed_linenumber_size, 1426 exception_table_len, 1427 checked_exceptions_len, 1428 method_parameters_len, 1429 cm->generic_signature_index(), 1430 method_annotations_len, 1431 parameter_annotations_len, 1432 type_annotations_len, 1433 default_annotations_len, 1434 0); 1435 1436 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1437 Method* newm_oop = Method::allocate(loader_data, 1438 new_code_length, 1439 flags, 1440 &sizes, 1441 m->method_type(), 1442 CHECK_(methodHandle())); 1443 methodHandle newm (THREAD, newm_oop); 1444 1445 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1446 ConstMethod* newcm = newm->constMethod(); 1447 int new_const_method_size = newm->constMethod()->size(); 1448 1449 // This works because the source and target are both Methods. Some compilers 1450 // (e.g., clang) complain that the target vtable pointer will be stomped, 1451 // so cast away newm()'s and m()'s Methodness. 1452 memcpy((void*)newm(), (void*)m(), sizeof(Method)); 1453 1454 // Create shallow copy of ConstMethod. 1455 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1456 1457 // Reset correct method/const method, method size, and parameter info 1458 newm->set_constMethod(newcm); 1459 newm->constMethod()->set_code_size(new_code_length); 1460 newm->constMethod()->set_constMethod_size(new_const_method_size); 1461 assert(newm->code_size() == new_code_length, "check"); 1462 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1463 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1464 assert(newm->exception_table_length() == exception_table_len, "check"); 1465 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1466 // Copy new byte codes 1467 memcpy(newm->code_base(), new_code, new_code_length); 1468 // Copy line number table 1469 if (new_compressed_linenumber_size > 0) { 1470 memcpy(newm->compressed_linenumber_table(), 1471 new_compressed_linenumber_table, 1472 new_compressed_linenumber_size); 1473 } 1474 // Copy method_parameters 1475 if (method_parameters_len > 0) { 1476 memcpy(newm->method_parameters_start(), 1477 m->method_parameters_start(), 1478 method_parameters_len * sizeof(MethodParametersElement)); 1479 } 1480 // Copy checked_exceptions 1481 if (checked_exceptions_len > 0) { 1482 memcpy(newm->checked_exceptions_start(), 1483 m->checked_exceptions_start(), 1484 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1485 } 1486 // Copy exception table 1487 if (exception_table_len > 0) { 1488 memcpy(newm->exception_table_start(), 1489 m->exception_table_start(), 1490 exception_table_len * sizeof(ExceptionTableElement)); 1491 } 1492 // Copy local variable number table 1493 if (localvariable_len > 0) { 1494 memcpy(newm->localvariable_table_start(), 1495 m->localvariable_table_start(), 1496 localvariable_len * sizeof(LocalVariableTableElement)); 1497 } 1498 // Copy stackmap table 1499 if (m->has_stackmap_table()) { 1500 int code_attribute_length = m->stackmap_data()->length(); 1501 Array<u1>* stackmap_data = 1502 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1503 memcpy((void*)stackmap_data->adr_at(0), 1504 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1505 newm->set_stackmap_data(stackmap_data); 1506 } 1507 1508 // copy annotations over to new method 1509 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL); 1510 return newm; 1511 } 1512 1513 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) { 1514 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1515 // because we are not loading from core libraries 1516 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1517 // which does not use the class default class loader so we check for its loader here 1518 const InstanceKlass* ik = InstanceKlass::cast(holder); 1519 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1520 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1521 } 1522 1523 // see if the klass name is well-known: 1524 Symbol* klass_name = ik->name(); 1525 return vmSymbols::find_sid(klass_name); 1526 } 1527 1528 void Method::init_intrinsic_id() { 1529 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1530 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1531 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1532 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1533 1534 // the klass name is well-known: 1535 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1536 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1537 1538 // ditto for method and signature: 1539 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1540 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1541 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1542 && name_id == vmSymbols::NO_SID) { 1543 return; 1544 } 1545 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1546 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1547 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1548 && sig_id == vmSymbols::NO_SID) { 1549 return; 1550 } 1551 jshort flags = access_flags().as_short(); 1552 1553 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1554 if (id != vmIntrinsics::_none) { 1555 set_intrinsic_id(id); 1556 if (id == vmIntrinsics::_Class_cast) { 1557 // Even if the intrinsic is rejected, we want to inline this simple method. 1558 set_force_inline(true); 1559 } 1560 return; 1561 } 1562 1563 // A few slightly irregular cases: 1564 switch (klass_id) { 1565 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1566 // Second chance: check in regular Math. 1567 switch (name_id) { 1568 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1569 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1570 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1571 // pretend it is the corresponding method in the non-strict class: 1572 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1573 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1574 break; 1575 default: 1576 break; 1577 } 1578 break; 1579 1580 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1581 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1582 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1583 if (!is_native()) break; 1584 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1585 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1586 id = vmIntrinsics::_none; 1587 break; 1588 1589 default: 1590 break; 1591 } 1592 1593 if (id != vmIntrinsics::_none) { 1594 // Set up its iid. It is an alias method. 1595 set_intrinsic_id(id); 1596 return; 1597 } 1598 } 1599 1600 // These two methods are static since a GC may move the Method 1601 bool Method::load_signature_classes(const methodHandle& m, TRAPS) { 1602 if (!THREAD->can_call_java()) { 1603 // There is nothing useful this routine can do from within the Compile thread. 1604 // Hopefully, the signature contains only well-known classes. 1605 // We could scan for this and return true/false, but the caller won't care. 1606 return false; 1607 } 1608 bool sig_is_loaded = true; 1609 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1610 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1611 ResourceMark rm(THREAD); 1612 Symbol* signature = m->signature(); 1613 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1614 if (ss.is_object()) { 1615 Symbol* sym = ss.as_symbol(); 1616 Symbol* name = sym; 1617 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1618 protection_domain, THREAD); 1619 // We are loading classes eagerly. If a ClassNotFoundException or 1620 // a LinkageError was generated, be sure to ignore it. 1621 if (HAS_PENDING_EXCEPTION) { 1622 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1623 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1624 CLEAR_PENDING_EXCEPTION; 1625 } else { 1626 return false; 1627 } 1628 } 1629 if( klass == NULL) { sig_is_loaded = false; } 1630 } 1631 } 1632 return sig_is_loaded; 1633 } 1634 1635 bool Method::has_unloaded_classes_in_signature(const methodHandle& m, TRAPS) { 1636 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1637 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1638 ResourceMark rm(THREAD); 1639 Symbol* signature = m->signature(); 1640 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1641 if (ss.type() == T_OBJECT) { 1642 Symbol* name = ss.as_symbol_or_null(); 1643 if (name == NULL) return true; 1644 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1645 if (klass == NULL) return true; 1646 } 1647 } 1648 return false; 1649 } 1650 1651 // Exposed so field engineers can debug VM 1652 void Method::print_short_name(outputStream* st) { 1653 ResourceMark rm; 1654 #ifdef PRODUCT 1655 st->print(" %s::", method_holder()->external_name()); 1656 #else 1657 st->print(" %s::", method_holder()->internal_name()); 1658 #endif 1659 name()->print_symbol_on(st); 1660 if (WizardMode) signature()->print_symbol_on(st); 1661 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1662 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1663 } 1664 1665 // Comparer for sorting an object array containing 1666 // Method*s. 1667 static int method_comparator(Method* a, Method* b) { 1668 return a->name()->fast_compare(b->name()); 1669 } 1670 1671 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1672 // default_methods also uses this without the ordering for fast find_method 1673 void Method::sort_methods(Array<Method*>* methods, bool set_idnums) { 1674 int length = methods->length(); 1675 if (length > 1) { 1676 { 1677 NoSafepointVerifier nsv; 1678 QuickSort::sort(methods->data(), length, method_comparator, /*idempotent=*/false); 1679 } 1680 // Reset method ordering 1681 if (set_idnums) { 1682 for (int i = 0; i < length; i++) { 1683 Method* m = methods->at(i); 1684 m->set_method_idnum(i); 1685 m->set_orig_method_idnum(i); 1686 } 1687 } 1688 } 1689 } 1690 1691 //----------------------------------------------------------------------------------- 1692 // Non-product code unless JVM/TI needs it 1693 1694 #if !defined(PRODUCT) || INCLUDE_JVMTI 1695 class SignatureTypePrinter : public SignatureTypeNames { 1696 private: 1697 outputStream* _st; 1698 bool _use_separator; 1699 1700 void type_name(const char* name) { 1701 if (_use_separator) _st->print(", "); 1702 _st->print("%s", name); 1703 _use_separator = true; 1704 } 1705 1706 public: 1707 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1708 _st = st; 1709 _use_separator = false; 1710 } 1711 1712 void print_parameters() { _use_separator = false; iterate_parameters(); } 1713 void print_returntype() { _use_separator = false; iterate_returntype(); } 1714 }; 1715 1716 1717 void Method::print_name(outputStream* st) { 1718 Thread *thread = Thread::current(); 1719 ResourceMark rm(thread); 1720 st->print("%s ", is_static() ? "static" : "virtual"); 1721 if (WizardMode) { 1722 st->print("%s.", method_holder()->internal_name()); 1723 name()->print_symbol_on(st); 1724 signature()->print_symbol_on(st); 1725 } else { 1726 SignatureTypePrinter sig(signature(), st); 1727 sig.print_returntype(); 1728 st->print(" %s.", method_holder()->internal_name()); 1729 name()->print_symbol_on(st); 1730 st->print("("); 1731 sig.print_parameters(); 1732 st->print(")"); 1733 } 1734 } 1735 #endif // !PRODUCT || INCLUDE_JVMTI 1736 1737 1738 void Method::print_codes_on(outputStream* st) const { 1739 print_codes_on(0, code_size(), st); 1740 } 1741 1742 void Method::print_codes_on(int from, int to, outputStream* st) const { 1743 Thread *thread = Thread::current(); 1744 ResourceMark rm(thread); 1745 methodHandle mh (thread, (Method*)this); 1746 BytecodeStream s(mh); 1747 s.set_interval(from, to); 1748 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1749 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1750 } 1751 1752 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1753 _bci = 0; 1754 _line = 0; 1755 }; 1756 1757 bool CompressedLineNumberReadStream::read_pair() { 1758 jubyte next = read_byte(); 1759 // Check for terminator 1760 if (next == 0) return false; 1761 if (next == 0xFF) { 1762 // Escape character, regular compression used 1763 _bci += read_signed_int(); 1764 _line += read_signed_int(); 1765 } else { 1766 // Single byte compression used 1767 _bci += next >> 3; 1768 _line += next & 0x7; 1769 } 1770 return true; 1771 } 1772 1773 #if INCLUDE_JVMTI 1774 1775 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1776 BreakpointInfo* bp = method_holder()->breakpoints(); 1777 for (; bp != NULL; bp = bp->next()) { 1778 if (bp->match(this, bci)) { 1779 return bp->orig_bytecode(); 1780 } 1781 } 1782 { 1783 ResourceMark rm; 1784 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1785 } 1786 return Bytecodes::_shouldnotreachhere; 1787 } 1788 1789 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1790 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1791 BreakpointInfo* bp = method_holder()->breakpoints(); 1792 for (; bp != NULL; bp = bp->next()) { 1793 if (bp->match(this, bci)) { 1794 bp->set_orig_bytecode(code); 1795 // and continue, in case there is more than one 1796 } 1797 } 1798 } 1799 1800 void Method::set_breakpoint(int bci) { 1801 InstanceKlass* ik = method_holder(); 1802 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1803 bp->set_next(ik->breakpoints()); 1804 ik->set_breakpoints(bp); 1805 // do this last: 1806 bp->set(this); 1807 } 1808 1809 static void clear_matches(Method* m, int bci) { 1810 InstanceKlass* ik = m->method_holder(); 1811 BreakpointInfo* prev_bp = NULL; 1812 BreakpointInfo* next_bp; 1813 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1814 next_bp = bp->next(); 1815 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1816 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1817 // do this first: 1818 bp->clear(m); 1819 // unhook it 1820 if (prev_bp != NULL) 1821 prev_bp->set_next(next_bp); 1822 else 1823 ik->set_breakpoints(next_bp); 1824 delete bp; 1825 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1826 // at same location. So we have multiple matching (method_index and bci) 1827 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1828 // breakpoint for clear_breakpoint request and keep all other method versions 1829 // BreakpointInfo for future clear_breakpoint request. 1830 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1831 // which is being called when class is unloaded. We delete all the Breakpoint 1832 // information for all versions of method. We may not correctly restore the original 1833 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1834 // so these methods won't be used anymore. 1835 if (bci >= 0) { 1836 break; 1837 } 1838 } else { 1839 // This one is a keeper. 1840 prev_bp = bp; 1841 } 1842 } 1843 } 1844 1845 void Method::clear_breakpoint(int bci) { 1846 assert(bci >= 0, ""); 1847 clear_matches(this, bci); 1848 } 1849 1850 void Method::clear_all_breakpoints() { 1851 clear_matches(this, -1); 1852 } 1853 1854 #endif // INCLUDE_JVMTI 1855 1856 int Method::invocation_count() { 1857 MethodCounters *mcs = method_counters(); 1858 if (TieredCompilation) { 1859 MethodData* const mdo = method_data(); 1860 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1861 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1862 return InvocationCounter::count_limit; 1863 } else { 1864 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1865 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1866 } 1867 } else { 1868 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1869 } 1870 } 1871 1872 int Method::backedge_count() { 1873 MethodCounters *mcs = method_counters(); 1874 if (TieredCompilation) { 1875 MethodData* const mdo = method_data(); 1876 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1877 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1878 return InvocationCounter::count_limit; 1879 } else { 1880 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1881 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1882 } 1883 } else { 1884 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1885 } 1886 } 1887 1888 int Method::highest_comp_level() const { 1889 const MethodCounters* mcs = method_counters(); 1890 if (mcs != NULL) { 1891 return mcs->highest_comp_level(); 1892 } else { 1893 return CompLevel_none; 1894 } 1895 } 1896 1897 int Method::highest_osr_comp_level() const { 1898 const MethodCounters* mcs = method_counters(); 1899 if (mcs != NULL) { 1900 return mcs->highest_osr_comp_level(); 1901 } else { 1902 return CompLevel_none; 1903 } 1904 } 1905 1906 void Method::set_highest_comp_level(int level) { 1907 MethodCounters* mcs = method_counters(); 1908 if (mcs != NULL) { 1909 mcs->set_highest_comp_level(level); 1910 } 1911 } 1912 1913 void Method::set_highest_osr_comp_level(int level) { 1914 MethodCounters* mcs = method_counters(); 1915 if (mcs != NULL) { 1916 mcs->set_highest_osr_comp_level(level); 1917 } 1918 } 1919 1920 #if INCLUDE_JVMTI 1921 1922 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1923 _bci = bci; 1924 _name_index = m->name_index(); 1925 _signature_index = m->signature_index(); 1926 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1927 if (_orig_bytecode == Bytecodes::_breakpoint) 1928 _orig_bytecode = m->orig_bytecode_at(_bci); 1929 _next = NULL; 1930 } 1931 1932 void BreakpointInfo::set(Method* method) { 1933 #ifdef ASSERT 1934 { 1935 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1936 if (code == Bytecodes::_breakpoint) 1937 code = method->orig_bytecode_at(_bci); 1938 assert(orig_bytecode() == code, "original bytecode must be the same"); 1939 } 1940 #endif 1941 Thread *thread = Thread::current(); 1942 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1943 method->incr_number_of_breakpoints(thread); 1944 { 1945 // Deoptimize all dependents on this method 1946 HandleMark hm(thread); 1947 methodHandle mh(thread, method); 1948 CodeCache::flush_dependents_on_method(mh); 1949 } 1950 } 1951 1952 void BreakpointInfo::clear(Method* method) { 1953 *method->bcp_from(_bci) = orig_bytecode(); 1954 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1955 method->decr_number_of_breakpoints(Thread::current()); 1956 } 1957 1958 #endif // INCLUDE_JVMTI 1959 1960 // jmethodID handling 1961 1962 // This is a block allocating object, sort of like JNIHandleBlock, only a 1963 // lot simpler. 1964 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1965 // never get rid of it. 1966 1967 static const int min_block_size = 8; 1968 1969 class JNIMethodBlockNode : public CHeapObj<mtClass> { 1970 friend class JNIMethodBlock; 1971 Method** _methods; 1972 int _number_of_methods; 1973 int _top; 1974 JNIMethodBlockNode* _next; 1975 1976 public: 1977 1978 JNIMethodBlockNode(int num_methods = min_block_size); 1979 1980 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 1981 1982 void ensure_methods(int num_addl_methods) { 1983 if (_top < _number_of_methods) { 1984 num_addl_methods -= _number_of_methods - _top; 1985 if (num_addl_methods <= 0) { 1986 return; 1987 } 1988 } 1989 if (_next == NULL) { 1990 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 1991 } else { 1992 _next->ensure_methods(num_addl_methods); 1993 } 1994 } 1995 }; 1996 1997 class JNIMethodBlock : public CHeapObj<mtClass> { 1998 JNIMethodBlockNode _head; 1999 JNIMethodBlockNode *_last_free; 2000 public: 2001 static Method* const _free_method; 2002 2003 JNIMethodBlock(int initial_capacity = min_block_size) 2004 : _head(initial_capacity), _last_free(&_head) {} 2005 2006 void ensure_methods(int num_addl_methods) { 2007 _last_free->ensure_methods(num_addl_methods); 2008 } 2009 2010 Method** add_method(Method* m) { 2011 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) { 2012 if (b->_top < b->_number_of_methods) { 2013 // top points to the next free entry. 2014 int i = b->_top; 2015 b->_methods[i] = m; 2016 b->_top++; 2017 _last_free = b; 2018 return &(b->_methods[i]); 2019 } else if (b->_top == b->_number_of_methods) { 2020 // if the next free entry ran off the block see if there's a free entry 2021 for (int i = 0; i < b->_number_of_methods; i++) { 2022 if (b->_methods[i] == _free_method) { 2023 b->_methods[i] = m; 2024 _last_free = b; 2025 return &(b->_methods[i]); 2026 } 2027 } 2028 // Only check each block once for frees. They're very unlikely. 2029 // Increment top past the end of the block. 2030 b->_top++; 2031 } 2032 // need to allocate a next block. 2033 if (b->_next == NULL) { 2034 b->_next = _last_free = new JNIMethodBlockNode(); 2035 } 2036 } 2037 guarantee(false, "Should always allocate a free block"); 2038 return NULL; 2039 } 2040 2041 bool contains(Method** m) { 2042 if (m == NULL) return false; 2043 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2044 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2045 // This is a bit of extra checking, for two reasons. One is 2046 // that contains() deals with pointers that are passed in by 2047 // JNI code, so making sure that the pointer is aligned 2048 // correctly is valuable. The other is that <= and > are 2049 // technically not defined on pointers, so the if guard can 2050 // pass spuriously; no modern compiler is likely to make that 2051 // a problem, though (and if one did, the guard could also 2052 // fail spuriously, which would be bad). 2053 ptrdiff_t idx = m - b->_methods; 2054 if (b->_methods + idx == m) { 2055 return true; 2056 } 2057 } 2058 } 2059 return false; // not found 2060 } 2061 2062 // Doesn't really destroy it, just marks it as free so it can be reused. 2063 void destroy_method(Method** m) { 2064 #ifdef ASSERT 2065 assert(contains(m), "should be a methodID"); 2066 #endif // ASSERT 2067 *m = _free_method; 2068 } 2069 2070 // During class unloading the methods are cleared, which is different 2071 // than freed. 2072 void clear_all_methods() { 2073 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2074 for (int i = 0; i< b->_number_of_methods; i++) { 2075 b->_methods[i] = NULL; 2076 } 2077 } 2078 } 2079 #ifndef PRODUCT 2080 int count_methods() { 2081 // count all allocated methods 2082 int count = 0; 2083 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2084 for (int i = 0; i< b->_number_of_methods; i++) { 2085 if (b->_methods[i] != _free_method) count++; 2086 } 2087 } 2088 return count; 2089 } 2090 #endif // PRODUCT 2091 }; 2092 2093 // Something that can't be mistaken for an address or a markWord 2094 Method* const JNIMethodBlock::_free_method = (Method*)55; 2095 2096 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(NULL) { 2097 _number_of_methods = MAX2(num_methods, min_block_size); 2098 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2099 for (int i = 0; i < _number_of_methods; i++) { 2100 _methods[i] = JNIMethodBlock::_free_method; 2101 } 2102 } 2103 2104 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) { 2105 ClassLoaderData* cld = loader_data; 2106 if (!SafepointSynchronize::is_at_safepoint()) { 2107 // Have to add jmethod_ids() to class loader data thread-safely. 2108 // Also have to add the method to the list safely, which the cld lock 2109 // protects as well. 2110 MutexLocker ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2111 if (cld->jmethod_ids() == NULL) { 2112 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2113 } else { 2114 cld->jmethod_ids()->ensure_methods(capacity); 2115 } 2116 } else { 2117 // At safepoint, we are single threaded and can set this. 2118 if (cld->jmethod_ids() == NULL) { 2119 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2120 } else { 2121 cld->jmethod_ids()->ensure_methods(capacity); 2122 } 2123 } 2124 } 2125 2126 // Add a method id to the jmethod_ids 2127 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 2128 ClassLoaderData* cld = loader_data; 2129 2130 if (!SafepointSynchronize::is_at_safepoint()) { 2131 // Have to add jmethod_ids() to class loader data thread-safely. 2132 // Also have to add the method to the list safely, which the cld lock 2133 // protects as well. 2134 MutexLocker ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2135 if (cld->jmethod_ids() == NULL) { 2136 cld->set_jmethod_ids(new JNIMethodBlock()); 2137 } 2138 // jmethodID is a pointer to Method* 2139 return (jmethodID)cld->jmethod_ids()->add_method(m); 2140 } else { 2141 // At safepoint, we are single threaded and can set this. 2142 if (cld->jmethod_ids() == NULL) { 2143 cld->set_jmethod_ids(new JNIMethodBlock()); 2144 } 2145 // jmethodID is a pointer to Method* 2146 return (jmethodID)cld->jmethod_ids()->add_method(m); 2147 } 2148 } 2149 2150 // Mark a jmethodID as free. This is called when there is a data race in 2151 // InstanceKlass while creating the jmethodID cache. 2152 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 2153 ClassLoaderData* cld = loader_data; 2154 Method** ptr = (Method**)m; 2155 assert(cld->jmethod_ids() != NULL, "should have method handles"); 2156 cld->jmethod_ids()->destroy_method(ptr); 2157 } 2158 2159 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2160 // Can't assert the method_holder is the same because the new method has the 2161 // scratch method holder. 2162 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2163 == new_method->method_holder()->class_loader() || 2164 new_method->method_holder()->class_loader() == NULL, // allow Unsafe substitution 2165 "changing to a different class loader"); 2166 // Just change the method in place, jmethodID pointer doesn't change. 2167 *((Method**)jmid) = new_method; 2168 } 2169 2170 bool Method::is_method_id(jmethodID mid) { 2171 Method* m = resolve_jmethod_id(mid); 2172 assert(m != NULL, "should be called with non-null method"); 2173 InstanceKlass* ik = m->method_holder(); 2174 ClassLoaderData* cld = ik->class_loader_data(); 2175 if (cld->jmethod_ids() == NULL) return false; 2176 return (cld->jmethod_ids()->contains((Method**)mid)); 2177 } 2178 2179 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2180 if (mid == NULL) return NULL; 2181 Method* o = resolve_jmethod_id(mid); 2182 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 2183 return NULL; 2184 } 2185 return o; 2186 }; 2187 2188 void Method::set_on_stack(const bool value) { 2189 // Set both the method itself and its constant pool. The constant pool 2190 // on stack means some method referring to it is also on the stack. 2191 constants()->set_on_stack(value); 2192 2193 bool already_set = on_stack(); 2194 _access_flags.set_on_stack(value); 2195 if (value && !already_set) { 2196 MetadataOnStackMark::record(this); 2197 } 2198 assert(!value || !is_old() || is_obsolete() || is_running_emcp(), 2199 "emcp methods cannot run after emcp bit is cleared"); 2200 } 2201 2202 // Called when the class loader is unloaded to make all methods weak. 2203 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2204 loader_data->jmethod_ids()->clear_all_methods(); 2205 } 2206 2207 bool Method::has_method_vptr(const void* ptr) { 2208 Method m; 2209 // This assumes that the vtbl pointer is the first word of a C++ object. 2210 return dereference_vptr(&m) == dereference_vptr(ptr); 2211 } 2212 2213 // Check that this pointer is valid by checking that the vtbl pointer matches 2214 bool Method::is_valid_method(const Method* m) { 2215 if (m == NULL) { 2216 return false; 2217 } else if ((intptr_t(m) & (wordSize-1)) != 0) { 2218 // Quick sanity check on pointer. 2219 return false; 2220 } else if (m->is_shared()) { 2221 return MetaspaceShared::is_valid_shared_method(m); 2222 } else if (Metaspace::contains_non_shared(m)) { 2223 return has_method_vptr((const void*)m); 2224 } else { 2225 return false; 2226 } 2227 } 2228 2229 #ifndef PRODUCT 2230 void Method::print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) { 2231 out->print(" jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 2232 } 2233 #endif // PRODUCT 2234 2235 2236 // Printing 2237 2238 #ifndef PRODUCT 2239 2240 void Method::print_on(outputStream* st) const { 2241 ResourceMark rm; 2242 assert(is_method(), "must be method"); 2243 st->print_cr("%s", internal_name()); 2244 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this)); 2245 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2246 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants())); 2247 constants()->print_value_on(st); st->cr(); 2248 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2249 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2250 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2251 st->print_cr(" - max stack: %d", max_stack()); 2252 st->print_cr(" - max locals: %d", max_locals()); 2253 st->print_cr(" - size of params: %d", size_of_parameters()); 2254 st->print_cr(" - method size: %d", method_size()); 2255 if (intrinsic_id() != vmIntrinsics::_none) 2256 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 2257 if (highest_comp_level() != CompLevel_none) 2258 st->print_cr(" - highest level: %d", highest_comp_level()); 2259 st->print_cr(" - vtable index: %d", _vtable_index); 2260 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry())); 2261 st->print( " - adapters: "); 2262 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2263 if (a == NULL) 2264 st->print_cr(INTPTR_FORMAT, p2i(a)); 2265 else 2266 a->print_adapter_on(st); 2267 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry())); 2268 st->print_cr(" - code size: %d", code_size()); 2269 if (code_size() != 0) { 2270 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base())); 2271 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size())); 2272 } 2273 if (method_data() != NULL) { 2274 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data())); 2275 } 2276 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2277 if (checked_exceptions_length() > 0) { 2278 CheckedExceptionElement* table = checked_exceptions_start(); 2279 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table)); 2280 if (Verbose) { 2281 for (int i = 0; i < checked_exceptions_length(); i++) { 2282 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2283 } 2284 } 2285 } 2286 if (has_linenumber_table()) { 2287 u_char* table = compressed_linenumber_table(); 2288 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table)); 2289 if (Verbose) { 2290 CompressedLineNumberReadStream stream(table); 2291 while (stream.read_pair()) { 2292 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2293 } 2294 } 2295 } 2296 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2297 if (localvariable_table_length() > 0) { 2298 LocalVariableTableElement* table = localvariable_table_start(); 2299 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table)); 2300 if (Verbose) { 2301 for (int i = 0; i < localvariable_table_length(); i++) { 2302 int bci = table[i].start_bci; 2303 int len = table[i].length; 2304 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2305 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2306 int slot = table[i].slot; 2307 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2308 } 2309 } 2310 } 2311 if (code() != NULL) { 2312 st->print (" - compiled code: "); 2313 code()->print_value_on(st); 2314 } 2315 if (is_native()) { 2316 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function())); 2317 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler())); 2318 } 2319 } 2320 2321 void Method::print_linkage_flags(outputStream* st) { 2322 access_flags().print_on(st); 2323 if (is_default_method()) { 2324 st->print("default "); 2325 } 2326 if (is_overpass()) { 2327 st->print("overpass "); 2328 } 2329 } 2330 #endif //PRODUCT 2331 2332 void Method::print_value_on(outputStream* st) const { 2333 assert(is_method(), "must be method"); 2334 st->print("%s", internal_name()); 2335 print_address_on(st); 2336 st->print(" "); 2337 name()->print_value_on(st); 2338 st->print(" "); 2339 signature()->print_value_on(st); 2340 st->print(" in "); 2341 method_holder()->print_value_on(st); 2342 if (WizardMode) st->print("#%d", _vtable_index); 2343 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2344 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2345 } 2346 2347 #if INCLUDE_SERVICES 2348 // Size Statistics 2349 void Method::collect_statistics(KlassSizeStats *sz) const { 2350 int mysize = sz->count(this); 2351 sz->_method_bytes += mysize; 2352 sz->_method_all_bytes += mysize; 2353 sz->_rw_bytes += mysize; 2354 2355 if (constMethod()) { 2356 constMethod()->collect_statistics(sz); 2357 } 2358 if (method_data()) { 2359 method_data()->collect_statistics(sz); 2360 } 2361 } 2362 #endif // INCLUDE_SERVICES 2363 2364 // LogTouchedMethods and PrintTouchedMethods 2365 2366 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because 2367 // the Method may be garbage collected. Let's roll our own hash table. 2368 class TouchedMethodRecord : CHeapObj<mtTracing> { 2369 public: 2370 // It's OK to store Symbols here because they will NOT be GC'ed if 2371 // LogTouchedMethods is enabled. 2372 TouchedMethodRecord* _next; 2373 Symbol* _class_name; 2374 Symbol* _method_name; 2375 Symbol* _method_signature; 2376 }; 2377 2378 static const int TOUCHED_METHOD_TABLE_SIZE = 20011; 2379 static TouchedMethodRecord** _touched_method_table = NULL; 2380 2381 void Method::log_touched(TRAPS) { 2382 2383 const int table_size = TOUCHED_METHOD_TABLE_SIZE; 2384 Symbol* my_class = klass_name(); 2385 Symbol* my_name = name(); 2386 Symbol* my_sig = signature(); 2387 2388 unsigned int hash = my_class->identity_hash() + 2389 my_name->identity_hash() + 2390 my_sig->identity_hash(); 2391 juint index = juint(hash) % table_size; 2392 2393 MutexLocker ml(TouchedMethodLog_lock, THREAD); 2394 if (_touched_method_table == NULL) { 2395 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size, 2396 mtTracing, CURRENT_PC); 2397 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size); 2398 } 2399 2400 TouchedMethodRecord* ptr = _touched_method_table[index]; 2401 while (ptr) { 2402 if (ptr->_class_name == my_class && 2403 ptr->_method_name == my_name && 2404 ptr->_method_signature == my_sig) { 2405 return; 2406 } 2407 if (ptr->_next == NULL) break; 2408 ptr = ptr->_next; 2409 } 2410 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing); 2411 my_class->increment_refcount(); 2412 my_name->increment_refcount(); 2413 my_sig->increment_refcount(); 2414 nptr->_class_name = my_class; 2415 nptr->_method_name = my_name; 2416 nptr->_method_signature = my_sig; 2417 nptr->_next = NULL; 2418 2419 if (ptr == NULL) { 2420 // first 2421 _touched_method_table[index] = nptr; 2422 } else { 2423 ptr->_next = nptr; 2424 } 2425 } 2426 2427 void Method::print_touched_methods(outputStream* out) { 2428 MutexLocker ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock); 2429 out->print_cr("# Method::print_touched_methods version 1"); 2430 if (_touched_method_table) { 2431 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) { 2432 TouchedMethodRecord* ptr = _touched_method_table[i]; 2433 while(ptr) { 2434 ptr->_class_name->print_symbol_on(out); out->print("."); 2435 ptr->_method_name->print_symbol_on(out); out->print(":"); 2436 ptr->_method_signature->print_symbol_on(out); out->cr(); 2437 ptr = ptr->_next; 2438 } 2439 } 2440 } 2441 } 2442 2443 // Verification 2444 2445 void Method::verify_on(outputStream* st) { 2446 guarantee(is_method(), "object must be method"); 2447 guarantee(constants()->is_constantPool(), "should be constant pool"); 2448 MethodData* md = method_data(); 2449 guarantee(md == NULL || 2450 md->is_methodData(), "should be method data"); 2451 }