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