1 /* 2 * Copyright (c) 1997, 2018, 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/metadataOnStackMark.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "code/codeCache.hpp" 29 #include "code/debugInfoRec.hpp" 30 #include "gc/shared/collectedHeap.inline.hpp" 31 #include "interpreter/bytecodeStream.hpp" 32 #include "interpreter/bytecodeTracer.hpp" 33 #include "interpreter/bytecodes.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "interpreter/oopMapCache.hpp" 36 #include "memory/allocation.inline.hpp" 37 #include "memory/heapInspection.hpp" 38 #include "memory/metadataFactory.hpp" 39 #include "memory/metaspaceClosure.hpp" 40 #include "memory/metaspaceShared.hpp" 41 #include "memory/oopFactory.hpp" 42 #include "memory/resourceArea.hpp" 43 #include "memory/vtBuffer.hpp" 44 #include "oops/constMethod.hpp" 45 #include "oops/method.inline.hpp" 46 #include "oops/methodData.hpp" 47 #include "oops/objArrayOop.inline.hpp" 48 #include "oops/oop.inline.hpp" 49 #include "oops/symbol.hpp" 50 #include "oops/valueKlass.hpp" 51 #include "prims/jvmtiExport.hpp" 52 #include "prims/methodHandles.hpp" 53 #include "prims/nativeLookup.hpp" 54 #include "runtime/arguments.hpp" 55 #include "runtime/compilationPolicy.hpp" 56 #include "runtime/frame.inline.hpp" 57 #include "runtime/handles.inline.hpp" 58 #include "runtime/init.hpp" 59 #include "runtime/orderAccess.hpp" 60 #include "runtime/relocator.hpp" 61 #include "runtime/safepointVerifiers.hpp" 62 #include "runtime/sharedRuntime.hpp" 63 #include "runtime/signature.hpp" 64 #include "utilities/align.hpp" 65 #include "utilities/quickSort.hpp" 66 #include "utilities/vmError.hpp" 67 #include "utilities/xmlstream.hpp" 68 69 // Implementation of Method 70 71 Method* Method::allocate(ClassLoaderData* loader_data, 72 int byte_code_size, 73 AccessFlags access_flags, 74 InlineTableSizes* sizes, 75 ConstMethod::MethodType method_type, 76 TRAPS) { 77 assert(!access_flags.is_native() || byte_code_size == 0, 78 "native methods should not contain byte codes"); 79 ConstMethod* cm = ConstMethod::allocate(loader_data, 80 byte_code_size, 81 sizes, 82 method_type, 83 CHECK_NULL); 84 int size = Method::size(access_flags.is_native()); 85 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags); 86 } 87 88 Method::Method(ConstMethod* xconst, AccessFlags access_flags) { 89 NoSafepointVerifier no_safepoint; 90 set_constMethod(xconst); 91 set_access_flags(access_flags); 92 set_intrinsic_id(vmIntrinsics::_none); 93 set_force_inline(false); 94 set_hidden(false); 95 set_dont_inline(false); 96 set_has_injected_profile(false); 97 set_method_data(NULL); 98 clear_method_counters(); 99 set_vtable_index(Method::garbage_vtable_index); 100 101 // Fix and bury in Method* 102 set_interpreter_entry(NULL); // sets i2i entry and from_int 103 set_adapter_entry(NULL); 104 clear_code(false /* don't need a lock */); // from_c/from_i get set to c2i/i2i 105 106 if (access_flags.is_native()) { 107 clear_native_function(); 108 set_signature_handler(NULL); 109 } 110 111 initialize_max_vt_buffer(); 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 address Method::get_i2c_entry() { 130 assert(adapter() != NULL, "must have"); 131 return adapter()->get_i2c_entry(); 132 } 133 134 address Method::get_c2i_entry() { 135 assert(adapter() != NULL, "must have"); 136 return adapter()->get_c2i_entry(); 137 } 138 139 address Method::get_c2i_unverified_entry() { 140 assert(adapter() != NULL, "must have"); 141 return adapter()->get_c2i_unverified_entry(); 142 } 143 144 char* Method::name_and_sig_as_C_string() const { 145 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 146 } 147 148 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 149 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 150 } 151 152 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 153 const char* klass_name = klass->external_name(); 154 int klass_name_len = (int)strlen(klass_name); 155 int method_name_len = method_name->utf8_length(); 156 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 157 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 158 strcpy(dest, klass_name); 159 dest[klass_name_len] = '.'; 160 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 161 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 162 dest[len] = 0; 163 return dest; 164 } 165 166 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 167 Symbol* klass_name = klass->name(); 168 klass_name->as_klass_external_name(buf, size); 169 int len = (int)strlen(buf); 170 171 if (len < size - 1) { 172 buf[len++] = '.'; 173 174 method_name->as_C_string(&(buf[len]), size - len); 175 len = (int)strlen(buf); 176 177 signature->as_C_string(&(buf[len]), size - len); 178 } 179 180 return buf; 181 } 182 183 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) { 184 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 185 // access exception table 186 ExceptionTable table(mh()); 187 int length = table.length(); 188 // iterate through all entries sequentially 189 constantPoolHandle pool(THREAD, mh->constants()); 190 for (int i = 0; i < length; i ++) { 191 //reacquire the table in case a GC happened 192 ExceptionTable table(mh()); 193 int beg_bci = table.start_pc(i); 194 int end_bci = table.end_pc(i); 195 assert(beg_bci <= end_bci, "inconsistent exception table"); 196 if (beg_bci <= throw_bci && throw_bci < end_bci) { 197 // exception handler bci range covers throw_bci => investigate further 198 int handler_bci = table.handler_pc(i); 199 int klass_index = table.catch_type_index(i); 200 if (klass_index == 0) { 201 return handler_bci; 202 } else if (ex_klass == NULL) { 203 return handler_bci; 204 } else { 205 // we know the exception class => get the constraint class 206 // this may require loading of the constraint class; if verification 207 // fails or some other exception occurs, return handler_bci 208 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); 209 assert(k != NULL, "klass not loaded"); 210 if (ex_klass->is_subtype_of(k)) { 211 return handler_bci; 212 } 213 } 214 } 215 } 216 217 return -1; 218 } 219 220 void Method::mask_for(int bci, InterpreterOopMap* mask) { 221 methodHandle h_this(Thread::current(), this); 222 // Only GC uses the OopMapCache during thread stack root scanning 223 // any other uses generate an oopmap but do not save it in the cache. 224 if (Universe::heap()->is_gc_active()) { 225 method_holder()->mask_for(h_this, bci, mask); 226 } else { 227 OopMapCache::compute_one_oop_map(h_this, bci, mask); 228 } 229 return; 230 } 231 232 233 int Method::bci_from(address bcp) const { 234 if (is_native() && bcp == 0) { 235 return 0; 236 } 237 #ifdef ASSERT 238 { 239 ResourceMark rm; 240 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(), 241 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", 242 p2i(bcp), name_and_sig_as_C_string()); 243 } 244 #endif 245 return bcp - code_base(); 246 } 247 248 249 int Method::validate_bci(int bci) const { 250 return (bci == 0 || bci < code_size()) ? bci : -1; 251 } 252 253 // Return bci if it appears to be a valid bcp 254 // Return -1 otherwise. 255 // Used by profiling code, when invalid data is a possibility. 256 // The caller is responsible for validating the Method* itself. 257 int Method::validate_bci_from_bcp(address bcp) const { 258 // keep bci as -1 if not a valid bci 259 int bci = -1; 260 if (bcp == 0 || bcp == code_base()) { 261 // code_size() may return 0 and we allow 0 here 262 // the method may be native 263 bci = 0; 264 } else if (contains(bcp)) { 265 bci = bcp - code_base(); 266 } 267 // Assert that if we have dodged any asserts, bci is negative. 268 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 269 return bci; 270 } 271 272 address Method::bcp_from(int bci) const { 273 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), 274 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native"); 275 address bcp = code_base() + bci; 276 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 277 return bcp; 278 } 279 280 address Method::bcp_from(address bcp) const { 281 if (is_native() && bcp == NULL) { 282 return code_base(); 283 } else { 284 return bcp; 285 } 286 } 287 288 int Method::size(bool is_native) { 289 // If native, then include pointers for native_function and signature_handler 290 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 291 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord; 292 return align_metadata_size(header_size() + extra_words); 293 } 294 295 296 Symbol* Method::klass_name() const { 297 return method_holder()->name(); 298 } 299 300 301 void Method::metaspace_pointers_do(MetaspaceClosure* it) { 302 log_trace(cds)("Iter(Method): %p", this); 303 304 it->push(&_constMethod); 305 it->push(&_method_data); 306 it->push(&_method_counters); 307 } 308 309 // Attempt to return method oop to original state. Clear any pointers 310 // (to objects outside the shared spaces). We won't be able to predict 311 // where they should point in a new JVM. Further initialize some 312 // entries now in order allow them to be write protected later. 313 314 void Method::remove_unshareable_info() { 315 unlink_method(); 316 } 317 318 void Method::set_vtable_index(int index) { 319 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 320 // At runtime initialize_vtable is rerun as part of link_class_impl() 321 // for a shared class loaded by the non-boot loader to obtain the loader 322 // constraints based on the runtime classloaders' context. 323 return; // don't write into the shared class 324 } else { 325 _vtable_index = index; 326 } 327 } 328 329 void Method::set_itable_index(int index) { 330 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 331 // At runtime initialize_itable is rerun as part of link_class_impl() 332 // for a shared class loaded by the non-boot loader to obtain the loader 333 // constraints based on the runtime classloaders' context. The dumptime 334 // itable index should be the same as the runtime index. 335 assert(_vtable_index == itable_index_max - index, 336 "archived itable index is different from runtime index"); 337 return; // don’t write into the shared class 338 } else { 339 _vtable_index = itable_index_max - index; 340 } 341 assert(valid_itable_index(), ""); 342 } 343 344 345 346 bool Method::was_executed_more_than(int n) { 347 // Invocation counter is reset when the Method* is compiled. 348 // If the method has compiled code we therefore assume it has 349 // be excuted more than n times. 350 if (is_accessor() || is_empty_method() || (code() != NULL)) { 351 // interpreter doesn't bump invocation counter of trivial methods 352 // compiler does not bump invocation counter of compiled methods 353 return true; 354 } 355 else if ((method_counters() != NULL && 356 method_counters()->invocation_counter()->carry()) || 357 (method_data() != NULL && 358 method_data()->invocation_counter()->carry())) { 359 // The carry bit is set when the counter overflows and causes 360 // a compilation to occur. We don't know how many times 361 // the counter has been reset, so we simply assume it has 362 // been executed more than n times. 363 return true; 364 } else { 365 return invocation_count() > n; 366 } 367 } 368 369 void Method::print_invocation_count() { 370 if (is_static()) tty->print("static "); 371 if (is_final()) tty->print("final "); 372 if (is_synchronized()) tty->print("synchronized "); 373 if (is_native()) tty->print("native "); 374 tty->print("%s::", method_holder()->external_name()); 375 name()->print_symbol_on(tty); 376 signature()->print_symbol_on(tty); 377 378 if (WizardMode) { 379 // dump the size of the byte codes 380 tty->print(" {%d}", code_size()); 381 } 382 tty->cr(); 383 384 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 385 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 386 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 387 #ifndef PRODUCT 388 if (CountCompiledCalls) { 389 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 390 } 391 #endif 392 } 393 394 // Build a MethodData* object to hold information about this method 395 // collected in the interpreter. 396 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) { 397 // Do not profile the method if metaspace has hit an OOM previously 398 // allocating profiling data. Callers clear pending exception so don't 399 // add one here. 400 if (ClassLoaderDataGraph::has_metaspace_oom()) { 401 return; 402 } 403 404 // Grab a lock here to prevent multiple 405 // MethodData*s from being created. 406 MutexLocker ml(MethodData_lock, THREAD); 407 if (method->method_data() == NULL) { 408 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 409 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 410 if (HAS_PENDING_EXCEPTION) { 411 CompileBroker::log_metaspace_failure(); 412 ClassLoaderDataGraph::set_metaspace_oom(true); 413 return; // return the exception (which is cleared) 414 } 415 416 method->set_method_data(method_data); 417 if (PrintMethodData && (Verbose || WizardMode)) { 418 ResourceMark rm(THREAD); 419 tty->print("build_interpreter_method_data for "); 420 method->print_name(tty); 421 tty->cr(); 422 // At the end of the run, the MDO, full of data, will be dumped. 423 } 424 } 425 } 426 427 MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 428 // Do not profile the method if metaspace has hit an OOM previously 429 if (ClassLoaderDataGraph::has_metaspace_oom()) { 430 return NULL; 431 } 432 433 methodHandle mh(m); 434 MethodCounters* counters = MethodCounters::allocate(mh, THREAD); 435 if (HAS_PENDING_EXCEPTION) { 436 CompileBroker::log_metaspace_failure(); 437 ClassLoaderDataGraph::set_metaspace_oom(true); 438 return NULL; // return the exception (which is cleared) 439 } 440 if (!mh->init_method_counters(counters)) { 441 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 442 } 443 444 if (LogTouchedMethods) { 445 mh->log_touched(CHECK_NULL); 446 } 447 448 return mh->method_counters(); 449 } 450 451 bool Method::init_method_counters(MethodCounters* counters) { 452 // Try to install a pointer to MethodCounters, return true on success. 453 return Atomic::replace_if_null(counters, &_method_counters); 454 } 455 456 int Method::extra_stack_words() { 457 // not an inline function, to avoid a header dependency on Interpreter 458 return extra_stack_entries() * Interpreter::stackElementSize; 459 } 460 461 462 void Method::compute_size_of_parameters(Thread *thread) { 463 ArgumentSizeComputer asc(signature()); 464 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 465 } 466 467 BasicType Method::result_type() const { 468 ResultTypeFinder rtf(signature()); 469 return rtf.type(); 470 } 471 472 #ifdef ASSERT 473 // ValueKlass the method is declared to return. This must not 474 // safepoint as it is called with references live on the stack at 475 // locations the GC is unaware of. 476 ValueKlass* Method::returned_value_type(Thread* thread) const { 477 assert(is_returning_vt(), "method return type should be value type"); 478 SignatureStream ss(signature()); 479 while (!ss.at_return_type()) { 480 ss.next(); 481 } 482 Handle class_loader(thread, method_holder()->class_loader()); 483 Handle protection_domain(thread, method_holder()->protection_domain()); 484 Klass* k = NULL; 485 { 486 NoSafepointVerifier nsv; 487 k = ss.as_klass(class_loader, protection_domain, SignatureStream::ReturnNull, thread); 488 } 489 assert(k != NULL && !thread->has_pending_exception(), "can't resolve klass"); 490 return ValueKlass::cast(k); 491 } 492 #endif 493 494 bool Method::has_value_args() const { 495 return adapter()->get_sig_extended() != NULL; 496 } 497 498 bool Method::is_empty_method() const { 499 return code_size() == 1 500 && *code_base() == Bytecodes::_return; 501 } 502 503 504 bool Method::is_vanilla_constructor() const { 505 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 506 // which only calls the superclass vanilla constructor and possibly does stores of 507 // zero constants to local fields: 508 // 509 // aload_0 510 // invokespecial 511 // indexbyte1 512 // indexbyte2 513 // 514 // followed by an (optional) sequence of: 515 // 516 // aload_0 517 // aconst_null / iconst_0 / fconst_0 / dconst_0 518 // putfield 519 // indexbyte1 520 // indexbyte2 521 // 522 // followed by: 523 // 524 // return 525 526 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 527 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 528 int size = code_size(); 529 // Check if size match 530 if (size == 0 || size % 5 != 0) return false; 531 address cb = code_base(); 532 int last = size - 1; 533 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 534 // Does not call superclass default constructor 535 return false; 536 } 537 // Check optional sequence 538 for (int i = 4; i < last; i += 5) { 539 if (cb[i] != Bytecodes::_aload_0) return false; 540 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 541 if (cb[i+2] != Bytecodes::_putfield) return false; 542 } 543 return true; 544 } 545 546 547 bool Method::compute_has_loops_flag() { 548 BytecodeStream bcs(this); 549 Bytecodes::Code bc; 550 551 while ((bc = bcs.next()) >= 0) { 552 switch( bc ) { 553 case Bytecodes::_ifeq: 554 case Bytecodes::_ifnull: 555 case Bytecodes::_iflt: 556 case Bytecodes::_ifle: 557 case Bytecodes::_ifne: 558 case Bytecodes::_ifnonnull: 559 case Bytecodes::_ifgt: 560 case Bytecodes::_ifge: 561 case Bytecodes::_if_icmpeq: 562 case Bytecodes::_if_icmpne: 563 case Bytecodes::_if_icmplt: 564 case Bytecodes::_if_icmpgt: 565 case Bytecodes::_if_icmple: 566 case Bytecodes::_if_icmpge: 567 case Bytecodes::_if_acmpeq: 568 case Bytecodes::_if_acmpne: 569 case Bytecodes::_goto: 570 case Bytecodes::_jsr: 571 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 572 break; 573 574 case Bytecodes::_goto_w: 575 case Bytecodes::_jsr_w: 576 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 577 break; 578 579 default: 580 break; 581 } 582 } 583 _access_flags.set_loops_flag_init(); 584 return _access_flags.has_loops(); 585 } 586 587 bool Method::is_final_method(AccessFlags class_access_flags) const { 588 // or "does_not_require_vtable_entry" 589 // default method or overpass can occur, is not final (reuses vtable entry) 590 // private methods in classes get vtable entries for backward class compatibility. 591 if (is_overpass() || is_default_method()) return false; 592 return is_final() || class_access_flags.is_final(); 593 } 594 595 bool Method::is_final_method() const { 596 return is_final_method(method_holder()->access_flags()); 597 } 598 599 bool Method::is_default_method() const { 600 if (method_holder() != NULL && 601 method_holder()->is_interface() && 602 !is_abstract() && !is_private()) { 603 return true; 604 } else { 605 return false; 606 } 607 } 608 609 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 610 if (is_final_method(class_access_flags)) return true; 611 #ifdef ASSERT 612 ResourceMark rm; 613 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 614 if (class_access_flags.is_interface()) { 615 assert(is_nonv == is_static() || is_nonv == is_private(), 616 "nonvirtual unexpected for non-static, non-private: %s", 617 name_and_sig_as_C_string()); 618 } 619 #endif 620 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 621 return vtable_index() == nonvirtual_vtable_index; 622 } 623 624 bool Method::can_be_statically_bound() const { 625 return can_be_statically_bound(method_holder()->access_flags()); 626 } 627 628 bool Method::is_accessor() const { 629 return is_getter() || is_setter(); 630 } 631 632 bool Method::is_getter() const { 633 if (code_size() != 5) return false; 634 if (size_of_parameters() != 1) return false; 635 if (java_code_at(0) != Bytecodes::_aload_0) return false; 636 if (java_code_at(1) != Bytecodes::_getfield) return false; 637 switch (java_code_at(4)) { 638 case Bytecodes::_ireturn: 639 case Bytecodes::_lreturn: 640 case Bytecodes::_freturn: 641 case Bytecodes::_dreturn: 642 case Bytecodes::_areturn: 643 break; 644 default: 645 return false; 646 } 647 return true; 648 } 649 650 bool Method::is_setter() const { 651 if (code_size() != 6) return false; 652 if (java_code_at(0) != Bytecodes::_aload_0) return false; 653 switch (java_code_at(1)) { 654 case Bytecodes::_iload_1: 655 case Bytecodes::_aload_1: 656 case Bytecodes::_fload_1: 657 if (size_of_parameters() != 2) return false; 658 break; 659 case Bytecodes::_dload_1: 660 case Bytecodes::_lload_1: 661 if (size_of_parameters() != 3) return false; 662 break; 663 default: 664 return false; 665 } 666 if (java_code_at(2) != Bytecodes::_putfield) return false; 667 if (java_code_at(5) != Bytecodes::_return) return false; 668 return true; 669 } 670 671 bool Method::is_constant_getter() const { 672 int last_index = code_size() - 1; 673 // Check if the first 1-3 bytecodes are a constant push 674 // and the last bytecode is a return. 675 return (2 <= code_size() && code_size() <= 4 && 676 Bytecodes::is_const(java_code_at(0)) && 677 Bytecodes::length_for(java_code_at(0)) == last_index && 678 Bytecodes::is_return(java_code_at(last_index))); 679 } 680 681 bool Method::is_initializer() const { 682 return is_object_initializer() || is_static_initializer(); 683 } 684 685 bool Method::has_valid_initializer_flags() const { 686 return (is_static() || 687 method_holder()->major_version() < 51); 688 } 689 690 bool Method::is_static_initializer() const { 691 // For classfiles version 51 or greater, ensure that the clinit method is 692 // static. Non-static methods with the name "<clinit>" are not static 693 // initializers. (older classfiles exempted for backward compatibility) 694 return name() == vmSymbols::class_initializer_name() && 695 has_valid_initializer_flags(); 696 } 697 698 bool Method::is_object_initializer() const { 699 return name() == vmSymbols::object_initializer_name(); 700 } 701 702 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 703 int length = method->checked_exceptions_length(); 704 if (length == 0) { // common case 705 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 706 } else { 707 methodHandle h_this(THREAD, method); 708 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 709 objArrayHandle mirrors (THREAD, m_oop); 710 for (int i = 0; i < length; i++) { 711 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 712 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 713 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 714 mirrors->obj_at_put(i, k->java_mirror()); 715 } 716 return mirrors; 717 } 718 }; 719 720 721 int Method::line_number_from_bci(int bci) const { 722 int best_bci = 0; 723 int best_line = -1; 724 if (bci == SynchronizationEntryBCI) bci = 0; 725 if (0 <= bci && bci < code_size() && has_linenumber_table()) { 726 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 727 // Not necessarily sorted and not necessarily one-to-one. 728 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 729 while (stream.read_pair()) { 730 if (stream.bci() == bci) { 731 // perfect match 732 return stream.line(); 733 } else { 734 // update best_bci/line 735 if (stream.bci() < bci && stream.bci() >= best_bci) { 736 best_bci = stream.bci(); 737 best_line = stream.line(); 738 } 739 } 740 } 741 } 742 return best_line; 743 } 744 745 746 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 747 if( constants()->tag_at(klass_index).is_unresolved_klass()) { 748 Thread *thread = Thread::current(); 749 Symbol* klass_name = constants()->klass_name_at(klass_index); 750 Handle loader(thread, method_holder()->class_loader()); 751 Handle prot (thread, method_holder()->protection_domain()); 752 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 753 } else { 754 return true; 755 } 756 } 757 758 759 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 760 int klass_index = constants()->klass_ref_index_at(refinfo_index); 761 if (must_be_resolved) { 762 // Make sure klass is resolved in constantpool. 763 if (constants()->tag_at(klass_index).is_unresolved_klass()) { 764 return false; 765 } 766 } 767 return is_klass_loaded_by_klass_index(klass_index); 768 } 769 770 771 void Method::set_native_function(address function, bool post_event_flag) { 772 assert(function != NULL, "use clear_native_function to unregister natives"); 773 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 774 address* native_function = native_function_addr(); 775 776 // We can see racers trying to place the same native function into place. Once 777 // is plenty. 778 address current = *native_function; 779 if (current == function) return; 780 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 781 function != NULL) { 782 // native_method_throw_unsatisfied_link_error_entry() should only 783 // be passed when post_event_flag is false. 784 assert(function != 785 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 786 "post_event_flag mis-match"); 787 788 // post the bind event, and possible change the bind function 789 JvmtiExport::post_native_method_bind(this, &function); 790 } 791 *native_function = function; 792 // This function can be called more than once. We must make sure that we always 793 // use the latest registered method -> check if a stub already has been generated. 794 // If so, we have to make it not_entrant. 795 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates 796 if (nm != NULL) { 797 nm->make_not_entrant(); 798 } 799 } 800 801 802 bool Method::has_native_function() const { 803 if (is_method_handle_intrinsic()) 804 return false; // special-cased in SharedRuntime::generate_native_wrapper 805 address func = native_function(); 806 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 807 } 808 809 810 void Method::clear_native_function() { 811 // Note: is_method_handle_intrinsic() is allowed here. 812 set_native_function( 813 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 814 !native_bind_event_is_interesting); 815 clear_code(); 816 } 817 818 address Method::critical_native_function() { 819 methodHandle mh(this); 820 return NativeLookup::lookup_critical_entry(mh); 821 } 822 823 824 void Method::set_signature_handler(address handler) { 825 address* signature_handler = signature_handler_addr(); 826 *signature_handler = handler; 827 } 828 829 830 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 831 if (PrintCompilation && report) { 832 ttyLocker ttyl; 833 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 834 if (comp_level == CompLevel_all) { 835 tty->print("all levels "); 836 } else { 837 tty->print("levels "); 838 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 839 tty->print("%d ", i); 840 } 841 } 842 this->print_short_name(tty); 843 int size = this->code_size(); 844 if (size > 0) { 845 tty->print(" (%d bytes)", size); 846 } 847 if (reason != NULL) { 848 tty->print(" %s", reason); 849 } 850 tty->cr(); 851 } 852 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 853 ttyLocker ttyl; 854 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 855 os::current_thread_id(), is_osr, comp_level); 856 if (reason != NULL) { 857 xtty->print(" reason=\'%s\'", reason); 858 } 859 xtty->method(this); 860 xtty->stamp(); 861 xtty->end_elem(); 862 } 863 } 864 865 bool Method::is_always_compilable() const { 866 // Generated adapters must be compiled 867 if (is_method_handle_intrinsic() && is_synthetic()) { 868 assert(!is_not_c1_compilable(), "sanity check"); 869 assert(!is_not_c2_compilable(), "sanity check"); 870 return true; 871 } 872 873 return false; 874 } 875 876 bool Method::is_not_compilable(int comp_level) const { 877 if (number_of_breakpoints() > 0) 878 return true; 879 if (is_always_compilable()) 880 return false; 881 if (comp_level == CompLevel_any) 882 return is_not_c1_compilable() || is_not_c2_compilable(); 883 if (is_c1_compile(comp_level)) 884 return is_not_c1_compilable(); 885 if (is_c2_compile(comp_level)) 886 return is_not_c2_compilable(); 887 return false; 888 } 889 890 // call this when compiler finds that this method is not compilable 891 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 892 if (is_always_compilable()) { 893 // Don't mark a method which should be always compilable 894 return; 895 } 896 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 897 if (comp_level == CompLevel_all) { 898 set_not_c1_compilable(); 899 set_not_c2_compilable(); 900 } else { 901 if (is_c1_compile(comp_level)) 902 set_not_c1_compilable(); 903 if (is_c2_compile(comp_level)) 904 set_not_c2_compilable(); 905 } 906 CompilationPolicy::policy()->disable_compilation(this); 907 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 908 } 909 910 bool Method::is_not_osr_compilable(int comp_level) const { 911 if (is_not_compilable(comp_level)) 912 return true; 913 if (comp_level == CompLevel_any) 914 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 915 if (is_c1_compile(comp_level)) 916 return is_not_c1_osr_compilable(); 917 if (is_c2_compile(comp_level)) 918 return is_not_c2_osr_compilable(); 919 return false; 920 } 921 922 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 923 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 924 if (comp_level == CompLevel_all) { 925 set_not_c1_osr_compilable(); 926 set_not_c2_osr_compilable(); 927 } else { 928 if (is_c1_compile(comp_level)) 929 set_not_c1_osr_compilable(); 930 if (is_c2_compile(comp_level)) 931 set_not_c2_osr_compilable(); 932 } 933 CompilationPolicy::policy()->disable_compilation(this); 934 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 935 } 936 937 // Revert to using the interpreter and clear out the nmethod 938 void Method::clear_code(bool acquire_lock /* = true */) { 939 MutexLockerEx pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag); 940 // this may be NULL if c2i adapters have not been made yet 941 // Only should happen at allocate time. 942 if (adapter() == NULL) { 943 _from_compiled_entry = NULL; 944 _from_compiled_value_entry = NULL; 945 } else { 946 _from_compiled_entry = adapter()->get_c2i_entry(); 947 _from_compiled_value_entry = adapter()->get_c2i_entry(); 948 } 949 OrderAccess::storestore(); 950 _from_interpreted_entry = _i2i_entry; 951 OrderAccess::storestore(); 952 _code = NULL; 953 } 954 955 #if INCLUDE_CDS 956 // Called by class data sharing to remove any entry points (which are not shared) 957 void Method::unlink_method() { 958 _code = NULL; 959 960 assert(DumpSharedSpaces, "dump time only"); 961 // Set the values to what they should be at run time. Note that 962 // this Method can no longer be executed during dump time. 963 _i2i_entry = Interpreter::entry_for_cds_method(this); 964 _from_interpreted_entry = _i2i_entry; 965 966 if (is_native()) { 967 *native_function_addr() = NULL; 968 set_signature_handler(NULL); 969 } 970 NOT_PRODUCT(set_compiled_invocation_count(0);) 971 972 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter(); 973 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline()); 974 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline(); 975 assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time"); 976 _from_compiled_value_entry = cds_adapter->get_c2i_entry_trampoline(); 977 assert(*((int*)_from_compiled_value_entry) == 0, "must be NULL during dump time, to be initialized at run time"); 978 979 set_method_data(NULL); 980 clear_method_counters(); 981 } 982 #endif 983 984 /**************************************************************************** 985 // The following illustrates how the entries work for CDS shared Methods: 986 // 987 // Our goal is to delay writing into a shared Method until it's compiled. 988 // Hence, we want to determine the initial values for _i2i_entry, 989 // _from_interpreted_entry and _from_compiled_entry during CDS dump time. 990 // 991 // In this example, both Methods A and B have the _i2i_entry of "zero_locals". 992 // They also have similar signatures so that they will share the same 993 // AdapterHandlerEntry. 994 // 995 // _adapter_trampoline points to a fixed location in the RW section of 996 // the CDS archive. This location initially contains a NULL pointer. When the 997 // first of method A or B is linked, an AdapterHandlerEntry is allocated 998 // dynamically, and its c2i/i2c entries are generated. 999 // 1000 // _i2i_entry and _from_interpreted_entry initially points to the same 1001 // (fixed) location in the CODE section of the CDS archive. This contains 1002 // an unconditional branch to the actual entry for "zero_locals", which is 1003 // generated at run time and may be on an arbitrary address. Thus, the 1004 // unconditional branch is also generated at run time to jump to the correct 1005 // address. 1006 // 1007 // Similarly, _from_compiled_entry points to a fixed address in the CODE 1008 // section. This address has enough space for an unconditional branch 1009 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is 1010 // initialized, and the address for the actual c2i_entry is known, we emit a 1011 // branch instruction here to branch to the actual c2i_entry. 1012 // 1013 // The effect of the extra branch on the i2i and c2i entries is negligible. 1014 // 1015 // The reason for putting _adapter_trampoline in RO is many shared Methods 1016 // share the same AdapterHandlerEntry, so we can save space in the RW section 1017 // by having the extra indirection. 1018 1019 1020 [Method A: RW] 1021 _constMethod ----> [ConstMethod: RO] 1022 _adapter_trampoline -----------+ 1023 | 1024 _i2i_entry (same value as method B) | 1025 _from_interpreted_entry (same value as method B) | 1026 _from_compiled_entry (same value as method B) | 1027 | 1028 | 1029 [Method B: RW] +--------+ 1030 _constMethod ----> [ConstMethod: RO] | 1031 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+ 1032 | 1033 +-------------------------------+ 1034 | 1035 +----> [AdapterHandlerEntry] (allocated at run time) 1036 _fingerprint 1037 _c2i_entry ---------------------------------+->[c2i entry..] 1038 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] | 1039 _from_interpreted_entry | _c2i_unverified_entry | | 1040 | | | | 1041 | | (_cds_entry_table: CODE) | | 1042 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | | 1043 | | (allocated at run time) | | 1044 | | ... [asm code ...] | | 1045 +-[not compiled]-+ [n]: jmp _entry_table[n] | | 1046 | | | 1047 | | | 1048 +-[compiled]-------------------------------------------------------------------+ | 1049 | 1050 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) | 1051 [jmp c2i_entry] ------------------------------------------------------+ 1052 1053 ***/ 1054 1055 // Called when the method_holder is getting linked. Setup entrypoints so the method 1056 // is ready to be called from interpreter, compiler, and vtables. 1057 void Method::link_method(const methodHandle& h_method, TRAPS) { 1058 // If the code cache is full, we may reenter this function for the 1059 // leftover methods that weren't linked. 1060 if (is_shared()) { 1061 address entry = Interpreter::entry_for_cds_method(h_method); 1062 assert(entry != NULL && entry == _i2i_entry, 1063 "should be correctly set during dump time"); 1064 if (adapter() != NULL) { 1065 return; 1066 } 1067 assert(entry == _from_interpreted_entry, 1068 "should be correctly set during dump time"); 1069 } else if (_i2i_entry != NULL) { 1070 return; 1071 } 1072 assert( _code == NULL, "nothing compiled yet" ); 1073 1074 // Setup interpreter entrypoint 1075 assert(this == h_method(), "wrong h_method()" ); 1076 1077 if (!is_shared()) { 1078 assert(adapter() == NULL, "init'd to NULL"); 1079 address entry = Interpreter::entry_for_method(h_method); 1080 assert(entry != NULL, "interpreter entry must be non-null"); 1081 // Sets both _i2i_entry and _from_interpreted_entry 1082 set_interpreter_entry(entry); 1083 } 1084 1085 // Don't overwrite already registered native entries. 1086 if (is_native() && !has_native_function()) { 1087 set_native_function( 1088 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1089 !native_bind_event_is_interesting); 1090 } 1091 1092 // Setup compiler entrypoint. This is made eagerly, so we do not need 1093 // special handling of vtables. An alternative is to make adapters more 1094 // lazily by calling make_adapter() from from_compiled_entry() for the 1095 // normal calls. For vtable calls life gets more complicated. When a 1096 // call-site goes mega-morphic we need adapters in all methods which can be 1097 // called from the vtable. We need adapters on such methods that get loaded 1098 // later. Ditto for mega-morphic itable calls. If this proves to be a 1099 // problem we'll make these lazily later. 1100 (void) make_adapters(h_method, CHECK); 1101 1102 // ONLY USE the h_method now as make_adapter may have blocked 1103 1104 } 1105 1106 address Method::make_adapters(const methodHandle& mh, TRAPS) { 1107 // Adapters for compiled code are made eagerly here. They are fairly 1108 // small (generally < 100 bytes) and quick to make (and cached and shared) 1109 // so making them eagerly shouldn't be too expensive. 1110 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh, CHECK_0); 1111 if (adapter == NULL ) { 1112 if (!is_init_completed()) { 1113 // Don't throw exceptions during VM initialization because java.lang.* classes 1114 // might not have been initialized, causing problems when constructing the 1115 // Java exception object. 1116 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1117 } else { 1118 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters"); 1119 } 1120 } 1121 1122 if (mh->is_shared()) { 1123 assert(mh->adapter() == adapter, "must be"); 1124 assert(mh->_from_compiled_entry != NULL, "must be"); 1125 assert(mh->_from_compiled_value_entry != NULL, "must be"); 1126 } else { 1127 mh->set_adapter_entry(adapter); 1128 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1129 mh->_from_compiled_value_entry = adapter->get_c2i_entry(); 1130 } 1131 return adapter->get_c2i_entry(); 1132 } 1133 1134 void Method::restore_unshareable_info(TRAPS) { 1135 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored"); 1136 1137 // Since restore_unshareable_info can be called more than once for a method, don't 1138 // redo any work. 1139 if (adapter() == NULL) { 1140 methodHandle mh(THREAD, this); 1141 link_method(mh, CHECK); 1142 } 1143 } 1144 1145 address Method::from_compiled_entry_no_trampoline() const { 1146 CompiledMethod *code = OrderAccess::load_acquire(&_code); 1147 if (code) { 1148 return code->verified_entry_point(); 1149 } else { 1150 return adapter()->get_c2i_entry(); 1151 } 1152 } 1153 1154 // The verified_code_entry() must be called when a invoke is resolved 1155 // on this method. 1156 1157 // It returns the compiled code entry point, after asserting not null. 1158 // This function is called after potential safepoints so that nmethod 1159 // or adapter that it points to is still live and valid. 1160 // This function must not hit a safepoint! 1161 address Method::verified_code_entry() { 1162 debug_only(NoSafepointVerifier nsv;) 1163 assert(_from_compiled_entry != NULL, "must be set"); 1164 return _from_compiled_entry; 1165 } 1166 1167 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1168 // (could be racing a deopt). 1169 // Not inline to avoid circular ref. 1170 bool Method::check_code() const { 1171 // cached in a register or local. There's a race on the value of the field. 1172 CompiledMethod *code = OrderAccess::load_acquire(&_code); 1173 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 1174 } 1175 1176 // Install compiled code. Instantly it can execute. 1177 void Method::set_code(const methodHandle& mh, CompiledMethod *code) { 1178 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1179 assert( code, "use clear_code to remove code" ); 1180 assert( mh->check_code(), "" ); 1181 1182 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 1183 1184 // These writes must happen in this order, because the interpreter will 1185 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1186 // which jumps to _from_compiled_entry. 1187 mh->_code = code; // Assign before allowing compiled code to exec 1188 1189 int comp_level = code->comp_level(); 1190 // In theory there could be a race here. In practice it is unlikely 1191 // and not worth worrying about. 1192 if (comp_level > mh->highest_comp_level()) { 1193 mh->set_highest_comp_level(comp_level); 1194 } 1195 1196 OrderAccess::storestore(); 1197 mh->_from_compiled_entry = code->verified_entry_point(); 1198 mh->_from_compiled_value_entry = mh->has_value_args() ? code->verified_value_entry_point() : code->verified_entry_point(); 1199 OrderAccess::storestore(); 1200 // Instantly compiled code can execute. 1201 if (!mh->is_method_handle_intrinsic()) 1202 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1203 } 1204 1205 1206 bool Method::is_overridden_in(Klass* k) const { 1207 InstanceKlass* ik = InstanceKlass::cast(k); 1208 1209 if (ik->is_interface()) return false; 1210 1211 // If method is an interface, we skip it - except if it 1212 // is a miranda method 1213 if (method_holder()->is_interface()) { 1214 // Check that method is not a miranda method 1215 if (ik->lookup_method(name(), signature()) == NULL) { 1216 // No implementation exist - so miranda method 1217 return false; 1218 } 1219 return true; 1220 } 1221 1222 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1223 if (!has_vtable_index()) { 1224 return false; 1225 } else { 1226 Method* vt_m = ik->method_at_vtable(vtable_index()); 1227 return vt_m != this; 1228 } 1229 } 1230 1231 1232 // give advice about whether this Method* should be cached or not 1233 bool Method::should_not_be_cached() const { 1234 if (is_old()) { 1235 // This method has been redefined. It is either EMCP or obsolete 1236 // and we don't want to cache it because that would pin the method 1237 // down and prevent it from being collectible if and when it 1238 // finishes executing. 1239 return true; 1240 } 1241 1242 // caching this method should be just fine 1243 return false; 1244 } 1245 1246 1247 /** 1248 * Returns true if this is one of the specially treated methods for 1249 * security related stack walks (like Reflection.getCallerClass). 1250 */ 1251 bool Method::is_ignored_by_security_stack_walk() const { 1252 if (intrinsic_id() == vmIntrinsics::_invoke) { 1253 // This is Method.invoke() -- ignore it 1254 return true; 1255 } 1256 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1257 // This is an auxilary frame -- ignore it 1258 return true; 1259 } 1260 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1261 // This is an internal adapter frame for method handles -- ignore it 1262 return true; 1263 } 1264 return false; 1265 } 1266 1267 1268 // Constant pool structure for invoke methods: 1269 enum { 1270 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1271 _imcp_invoke_signature, // utf8: (variable Symbol*) 1272 _imcp_limit 1273 }; 1274 1275 // Test if this method is an MH adapter frame generated by Java code. 1276 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1277 bool Method::is_compiled_lambda_form() const { 1278 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1279 } 1280 1281 // Test if this method is an internal MH primitive method. 1282 bool Method::is_method_handle_intrinsic() const { 1283 vmIntrinsics::ID iid = intrinsic_id(); 1284 return (MethodHandles::is_signature_polymorphic(iid) && 1285 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1286 } 1287 1288 bool Method::has_member_arg() const { 1289 vmIntrinsics::ID iid = intrinsic_id(); 1290 return (MethodHandles::is_signature_polymorphic(iid) && 1291 MethodHandles::has_member_arg(iid)); 1292 } 1293 1294 // Make an instance of a signature-polymorphic internal MH primitive. 1295 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1296 Symbol* signature, 1297 TRAPS) { 1298 ResourceMark rm; 1299 methodHandle empty; 1300 1301 InstanceKlass* holder = SystemDictionary::MethodHandle_klass(); 1302 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1303 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1304 if (TraceMethodHandles) { 1305 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1306 } 1307 1308 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1309 name->increment_refcount(); 1310 signature->increment_refcount(); 1311 1312 int cp_length = _imcp_limit; 1313 ClassLoaderData* loader_data = holder->class_loader_data(); 1314 constantPoolHandle cp; 1315 { 1316 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1317 cp = constantPoolHandle(THREAD, cp_oop); 1318 } 1319 cp->set_pool_holder(holder); 1320 cp->symbol_at_put(_imcp_invoke_name, name); 1321 cp->symbol_at_put(_imcp_invoke_signature, signature); 1322 cp->set_has_preresolution(); 1323 1324 // decide on access bits: public or not? 1325 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1326 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1327 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1328 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1329 1330 methodHandle m; 1331 { 1332 InlineTableSizes sizes; 1333 Method* m_oop = Method::allocate(loader_data, 0, 1334 accessFlags_from(flags_bits), &sizes, 1335 ConstMethod::NORMAL, CHECK_(empty)); 1336 m = methodHandle(THREAD, m_oop); 1337 } 1338 m->set_constants(cp()); 1339 m->set_name_index(_imcp_invoke_name); 1340 m->set_signature_index(_imcp_invoke_signature); 1341 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1342 assert(m->signature() == signature, ""); 1343 ResultTypeFinder rtf(signature); 1344 m->constMethod()->set_result_type(rtf.type()); 1345 m->compute_size_of_parameters(THREAD); 1346 m->init_intrinsic_id(); 1347 assert(m->is_method_handle_intrinsic(), ""); 1348 #ifdef ASSERT 1349 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1350 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1351 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1352 #endif //ASSERT 1353 1354 // Finally, set up its entry points. 1355 assert(m->can_be_statically_bound(), ""); 1356 m->set_vtable_index(Method::nonvirtual_vtable_index); 1357 m->link_method(m, CHECK_(empty)); 1358 1359 if (TraceMethodHandles && (Verbose || WizardMode)) { 1360 ttyLocker ttyl; 1361 m->print_on(tty); 1362 } 1363 1364 return m; 1365 } 1366 1367 Klass* Method::check_non_bcp_klass(Klass* klass) { 1368 if (klass != NULL && klass->class_loader() != NULL) { 1369 if (klass->is_objArray_klass()) 1370 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1371 return klass; 1372 } 1373 return NULL; 1374 } 1375 1376 1377 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, 1378 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1379 // Code below does not work for native methods - they should never get rewritten anyway 1380 assert(!m->is_native(), "cannot rewrite native methods"); 1381 // Allocate new Method* 1382 AccessFlags flags = m->access_flags(); 1383 1384 ConstMethod* cm = m->constMethod(); 1385 int checked_exceptions_len = cm->checked_exceptions_length(); 1386 int localvariable_len = cm->localvariable_table_length(); 1387 int exception_table_len = cm->exception_table_length(); 1388 int method_parameters_len = cm->method_parameters_length(); 1389 int method_annotations_len = cm->method_annotations_length(); 1390 int parameter_annotations_len = cm->parameter_annotations_length(); 1391 int type_annotations_len = cm->type_annotations_length(); 1392 int default_annotations_len = cm->default_annotations_length(); 1393 1394 InlineTableSizes sizes( 1395 localvariable_len, 1396 new_compressed_linenumber_size, 1397 exception_table_len, 1398 checked_exceptions_len, 1399 method_parameters_len, 1400 cm->generic_signature_index(), 1401 method_annotations_len, 1402 parameter_annotations_len, 1403 type_annotations_len, 1404 default_annotations_len, 1405 0); 1406 1407 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1408 Method* newm_oop = Method::allocate(loader_data, 1409 new_code_length, 1410 flags, 1411 &sizes, 1412 m->method_type(), 1413 CHECK_(methodHandle())); 1414 methodHandle newm (THREAD, newm_oop); 1415 1416 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1417 ConstMethod* newcm = newm->constMethod(); 1418 int new_const_method_size = newm->constMethod()->size(); 1419 1420 // This works because the source and target are both Methods. Some compilers 1421 // (e.g., clang) complain that the target vtable pointer will be stomped, 1422 // so cast away newm()'s and m()'s Methodness. 1423 memcpy((void*)newm(), (void*)m(), sizeof(Method)); 1424 1425 // Create shallow copy of ConstMethod. 1426 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1427 1428 // Reset correct method/const method, method size, and parameter info 1429 newm->set_constMethod(newcm); 1430 newm->constMethod()->set_code_size(new_code_length); 1431 newm->constMethod()->set_constMethod_size(new_const_method_size); 1432 assert(newm->code_size() == new_code_length, "check"); 1433 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1434 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1435 assert(newm->exception_table_length() == exception_table_len, "check"); 1436 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1437 // Copy new byte codes 1438 memcpy(newm->code_base(), new_code, new_code_length); 1439 // Copy line number table 1440 if (new_compressed_linenumber_size > 0) { 1441 memcpy(newm->compressed_linenumber_table(), 1442 new_compressed_linenumber_table, 1443 new_compressed_linenumber_size); 1444 } 1445 // Copy method_parameters 1446 if (method_parameters_len > 0) { 1447 memcpy(newm->method_parameters_start(), 1448 m->method_parameters_start(), 1449 method_parameters_len * sizeof(MethodParametersElement)); 1450 } 1451 // Copy checked_exceptions 1452 if (checked_exceptions_len > 0) { 1453 memcpy(newm->checked_exceptions_start(), 1454 m->checked_exceptions_start(), 1455 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1456 } 1457 // Copy exception table 1458 if (exception_table_len > 0) { 1459 memcpy(newm->exception_table_start(), 1460 m->exception_table_start(), 1461 exception_table_len * sizeof(ExceptionTableElement)); 1462 } 1463 // Copy local variable number table 1464 if (localvariable_len > 0) { 1465 memcpy(newm->localvariable_table_start(), 1466 m->localvariable_table_start(), 1467 localvariable_len * sizeof(LocalVariableTableElement)); 1468 } 1469 // Copy stackmap table 1470 if (m->has_stackmap_table()) { 1471 int code_attribute_length = m->stackmap_data()->length(); 1472 Array<u1>* stackmap_data = 1473 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1474 memcpy((void*)stackmap_data->adr_at(0), 1475 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1476 newm->set_stackmap_data(stackmap_data); 1477 } 1478 1479 // copy annotations over to new method 1480 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL); 1481 return newm; 1482 } 1483 1484 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) { 1485 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1486 // because we are not loading from core libraries 1487 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1488 // which does not use the class default class loader so we check for its loader here 1489 const InstanceKlass* ik = InstanceKlass::cast(holder); 1490 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1491 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1492 } 1493 1494 // see if the klass name is well-known: 1495 Symbol* klass_name = ik->name(); 1496 return vmSymbols::find_sid(klass_name); 1497 } 1498 1499 void Method::init_intrinsic_id() { 1500 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1501 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1502 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1503 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1504 1505 // the klass name is well-known: 1506 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1507 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1508 1509 // ditto for method and signature: 1510 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1511 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1512 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1513 && name_id == vmSymbols::NO_SID) { 1514 return; 1515 } 1516 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 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 && sig_id == vmSymbols::NO_SID) { 1520 return; 1521 } 1522 jshort flags = access_flags().as_short(); 1523 1524 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1525 if (id != vmIntrinsics::_none) { 1526 set_intrinsic_id(id); 1527 if (id == vmIntrinsics::_Class_cast) { 1528 // Even if the intrinsic is rejected, we want to inline this simple method. 1529 set_force_inline(true); 1530 } 1531 return; 1532 } 1533 1534 // A few slightly irregular cases: 1535 switch (klass_id) { 1536 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1537 // Second chance: check in regular Math. 1538 switch (name_id) { 1539 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1540 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1541 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1542 // pretend it is the corresponding method in the non-strict class: 1543 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1544 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1545 break; 1546 default: 1547 break; 1548 } 1549 break; 1550 1551 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1552 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1553 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1554 if (!is_native()) break; 1555 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1556 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1557 id = vmIntrinsics::_none; 1558 break; 1559 1560 default: 1561 break; 1562 } 1563 1564 if (id != vmIntrinsics::_none) { 1565 // Set up its iid. It is an alias method. 1566 set_intrinsic_id(id); 1567 return; 1568 } 1569 } 1570 1571 // These two methods are static since a GC may move the Method 1572 bool Method::load_signature_classes(const methodHandle& m, TRAPS) { 1573 if (!THREAD->can_call_java()) { 1574 // There is nothing useful this routine can do from within the Compile thread. 1575 // Hopefully, the signature contains only well-known classes. 1576 // We could scan for this and return true/false, but the caller won't care. 1577 return false; 1578 } 1579 bool sig_is_loaded = true; 1580 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1581 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1582 ResourceMark rm(THREAD); 1583 Symbol* signature = m->signature(); 1584 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1585 if (ss.is_object()) { 1586 Symbol* sym = ss.as_symbol(CHECK_(false)); 1587 Symbol* name = sym; 1588 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1589 protection_domain, THREAD); 1590 // We are loading classes eagerly. If a ClassNotFoundException or 1591 // a LinkageError was generated, be sure to ignore it. 1592 if (HAS_PENDING_EXCEPTION) { 1593 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1594 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1595 CLEAR_PENDING_EXCEPTION; 1596 } else { 1597 return false; 1598 } 1599 } 1600 if( klass == NULL) { sig_is_loaded = false; } 1601 } 1602 } 1603 return sig_is_loaded; 1604 } 1605 1606 bool Method::has_unloaded_classes_in_signature(const methodHandle& m, TRAPS) { 1607 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1608 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1609 ResourceMark rm(THREAD); 1610 Symbol* signature = m->signature(); 1611 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1612 if (ss.type() == T_OBJECT) { 1613 Symbol* name = ss.as_symbol_or_null(); 1614 if (name == NULL) return true; 1615 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1616 if (klass == NULL) return true; 1617 } 1618 } 1619 return false; 1620 } 1621 1622 // Exposed so field engineers can debug VM 1623 void Method::print_short_name(outputStream* st) { 1624 ResourceMark rm; 1625 #ifdef PRODUCT 1626 st->print(" %s::", method_holder()->external_name()); 1627 #else 1628 st->print(" %s::", method_holder()->internal_name()); 1629 #endif 1630 name()->print_symbol_on(st); 1631 if (WizardMode) signature()->print_symbol_on(st); 1632 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1633 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1634 } 1635 1636 // Comparer for sorting an object array containing 1637 // Method*s. 1638 static int method_comparator(Method* a, Method* b) { 1639 return a->name()->fast_compare(b->name()); 1640 } 1641 1642 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1643 // default_methods also uses this without the ordering for fast find_method 1644 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) { 1645 int length = methods->length(); 1646 if (length > 1) { 1647 { 1648 NoSafepointVerifier nsv; 1649 QuickSort::sort(methods->data(), length, method_comparator, idempotent); 1650 } 1651 // Reset method ordering 1652 if (set_idnums) { 1653 for (int i = 0; i < length; i++) { 1654 Method* m = methods->at(i); 1655 m->set_method_idnum(i); 1656 m->set_orig_method_idnum(i); 1657 } 1658 } 1659 } 1660 } 1661 1662 //----------------------------------------------------------------------------------- 1663 // Non-product code unless JVM/TI needs it 1664 1665 #if !defined(PRODUCT) || INCLUDE_JVMTI 1666 class SignatureTypePrinter : public SignatureTypeNames { 1667 private: 1668 outputStream* _st; 1669 bool _use_separator; 1670 1671 void type_name(const char* name) { 1672 if (_use_separator) _st->print(", "); 1673 _st->print("%s", name); 1674 _use_separator = true; 1675 } 1676 1677 public: 1678 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1679 _st = st; 1680 _use_separator = false; 1681 } 1682 1683 void print_parameters() { _use_separator = false; iterate_parameters(); } 1684 void print_returntype() { _use_separator = false; iterate_returntype(); } 1685 }; 1686 1687 1688 void Method::print_name(outputStream* st) { 1689 Thread *thread = Thread::current(); 1690 ResourceMark rm(thread); 1691 st->print("%s ", is_static() ? "static" : "virtual"); 1692 if (WizardMode) { 1693 st->print("%s.", method_holder()->internal_name()); 1694 name()->print_symbol_on(st); 1695 signature()->print_symbol_on(st); 1696 } else { 1697 SignatureTypePrinter sig(signature(), st); 1698 sig.print_returntype(); 1699 st->print(" %s.", method_holder()->internal_name()); 1700 name()->print_symbol_on(st); 1701 st->print("("); 1702 sig.print_parameters(); 1703 st->print(")"); 1704 } 1705 } 1706 #endif // !PRODUCT || INCLUDE_JVMTI 1707 1708 1709 void Method::print_codes_on(outputStream* st) const { 1710 print_codes_on(0, code_size(), st); 1711 } 1712 1713 void Method::print_codes_on(int from, int to, outputStream* st) const { 1714 Thread *thread = Thread::current(); 1715 ResourceMark rm(thread); 1716 methodHandle mh (thread, (Method*)this); 1717 BytecodeStream s(mh); 1718 s.set_interval(from, to); 1719 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1720 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1721 } 1722 1723 1724 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1725 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1726 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1727 // as end-of-stream terminator. 1728 1729 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1730 // bci and line number does not compress into single byte. 1731 // Write out escape character and use regular compression for bci and line number. 1732 write_byte((jubyte)0xFF); 1733 write_signed_int(bci_delta); 1734 write_signed_int(line_delta); 1735 } 1736 1737 // See comment in method.hpp which explains why this exists. 1738 #if defined(_M_AMD64) && _MSC_VER >= 1400 1739 #pragma optimize("", off) 1740 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1741 write_pair_inline(bci, line); 1742 } 1743 #pragma optimize("", on) 1744 #endif 1745 1746 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1747 _bci = 0; 1748 _line = 0; 1749 }; 1750 1751 1752 bool CompressedLineNumberReadStream::read_pair() { 1753 jubyte next = read_byte(); 1754 // Check for terminator 1755 if (next == 0) return false; 1756 if (next == 0xFF) { 1757 // Escape character, regular compression used 1758 _bci += read_signed_int(); 1759 _line += read_signed_int(); 1760 } else { 1761 // Single byte compression used 1762 _bci += next >> 3; 1763 _line += next & 0x7; 1764 } 1765 return true; 1766 } 1767 1768 #if INCLUDE_JVMTI 1769 1770 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1771 BreakpointInfo* bp = method_holder()->breakpoints(); 1772 for (; bp != NULL; bp = bp->next()) { 1773 if (bp->match(this, bci)) { 1774 return bp->orig_bytecode(); 1775 } 1776 } 1777 { 1778 ResourceMark rm; 1779 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1780 } 1781 return Bytecodes::_shouldnotreachhere; 1782 } 1783 1784 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1785 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1786 BreakpointInfo* bp = method_holder()->breakpoints(); 1787 for (; bp != NULL; bp = bp->next()) { 1788 if (bp->match(this, bci)) { 1789 bp->set_orig_bytecode(code); 1790 // and continue, in case there is more than one 1791 } 1792 } 1793 } 1794 1795 void Method::set_breakpoint(int bci) { 1796 InstanceKlass* ik = method_holder(); 1797 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1798 bp->set_next(ik->breakpoints()); 1799 ik->set_breakpoints(bp); 1800 // do this last: 1801 bp->set(this); 1802 } 1803 1804 static void clear_matches(Method* m, int bci) { 1805 InstanceKlass* ik = m->method_holder(); 1806 BreakpointInfo* prev_bp = NULL; 1807 BreakpointInfo* next_bp; 1808 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1809 next_bp = bp->next(); 1810 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1811 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1812 // do this first: 1813 bp->clear(m); 1814 // unhook it 1815 if (prev_bp != NULL) 1816 prev_bp->set_next(next_bp); 1817 else 1818 ik->set_breakpoints(next_bp); 1819 delete bp; 1820 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1821 // at same location. So we have multiple matching (method_index and bci) 1822 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1823 // breakpoint for clear_breakpoint request and keep all other method versions 1824 // BreakpointInfo for future clear_breakpoint request. 1825 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1826 // which is being called when class is unloaded. We delete all the Breakpoint 1827 // information for all versions of method. We may not correctly restore the original 1828 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1829 // so these methods won't be used anymore. 1830 if (bci >= 0) { 1831 break; 1832 } 1833 } else { 1834 // This one is a keeper. 1835 prev_bp = bp; 1836 } 1837 } 1838 } 1839 1840 void Method::clear_breakpoint(int bci) { 1841 assert(bci >= 0, ""); 1842 clear_matches(this, bci); 1843 } 1844 1845 void Method::clear_all_breakpoints() { 1846 clear_matches(this, -1); 1847 } 1848 1849 #endif // INCLUDE_JVMTI 1850 1851 int Method::invocation_count() { 1852 MethodCounters *mcs = method_counters(); 1853 if (TieredCompilation) { 1854 MethodData* const mdo = method_data(); 1855 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1856 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1857 return InvocationCounter::count_limit; 1858 } else { 1859 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1860 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1861 } 1862 } else { 1863 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1864 } 1865 } 1866 1867 int Method::backedge_count() { 1868 MethodCounters *mcs = method_counters(); 1869 if (TieredCompilation) { 1870 MethodData* const mdo = method_data(); 1871 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1872 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1873 return InvocationCounter::count_limit; 1874 } else { 1875 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1876 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1877 } 1878 } else { 1879 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1880 } 1881 } 1882 1883 void Method::initialize_max_vt_buffer() { 1884 long long max_entries = constMethod()->max_locals() + constMethod()->max_stack(); 1885 max_entries *= 2; // Add margin for loops 1886 long long max_size = max_entries * (BigValueTypeThreshold + 8); // 8 -> header size 1887 int max_chunks = (int)(max_size / VTBufferChunk::max_alloc_size()) + 1; 1888 set_max_vt_buffer(MAX2(MinimumVTBufferChunkPerFrame, max_chunks)); 1889 } 1890 1891 int Method::highest_comp_level() const { 1892 const MethodCounters* mcs = method_counters(); 1893 if (mcs != NULL) { 1894 return mcs->highest_comp_level(); 1895 } else { 1896 return CompLevel_none; 1897 } 1898 } 1899 1900 int Method::highest_osr_comp_level() const { 1901 const MethodCounters* mcs = method_counters(); 1902 if (mcs != NULL) { 1903 return mcs->highest_osr_comp_level(); 1904 } else { 1905 return CompLevel_none; 1906 } 1907 } 1908 1909 void Method::set_highest_comp_level(int level) { 1910 MethodCounters* mcs = method_counters(); 1911 if (mcs != NULL) { 1912 mcs->set_highest_comp_level(level); 1913 } 1914 } 1915 1916 void Method::set_highest_osr_comp_level(int level) { 1917 MethodCounters* mcs = method_counters(); 1918 if (mcs != NULL) { 1919 mcs->set_highest_osr_comp_level(level); 1920 } 1921 } 1922 1923 #if INCLUDE_JVMTI 1924 1925 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1926 _bci = bci; 1927 _name_index = m->name_index(); 1928 _signature_index = m->signature_index(); 1929 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1930 if (_orig_bytecode == Bytecodes::_breakpoint) 1931 _orig_bytecode = m->orig_bytecode_at(_bci); 1932 _next = NULL; 1933 } 1934 1935 void BreakpointInfo::set(Method* method) { 1936 #ifdef ASSERT 1937 { 1938 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1939 if (code == Bytecodes::_breakpoint) 1940 code = method->orig_bytecode_at(_bci); 1941 assert(orig_bytecode() == code, "original bytecode must be the same"); 1942 } 1943 #endif 1944 Thread *thread = Thread::current(); 1945 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1946 method->incr_number_of_breakpoints(thread); 1947 SystemDictionary::notice_modification(); 1948 { 1949 // Deoptimize all dependents on this method 1950 HandleMark hm(thread); 1951 methodHandle mh(thread, method); 1952 CodeCache::flush_dependents_on_method(mh); 1953 } 1954 } 1955 1956 void BreakpointInfo::clear(Method* method) { 1957 *method->bcp_from(_bci) = orig_bytecode(); 1958 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1959 method->decr_number_of_breakpoints(Thread::current()); 1960 } 1961 1962 #endif // INCLUDE_JVMTI 1963 1964 // jmethodID handling 1965 1966 // This is a block allocating object, sort of like JNIHandleBlock, only a 1967 // lot simpler. 1968 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1969 // never get rid of it. 1970 1971 static const int min_block_size = 8; 1972 1973 class JNIMethodBlockNode : public CHeapObj<mtClass> { 1974 friend class JNIMethodBlock; 1975 Method** _methods; 1976 int _number_of_methods; 1977 int _top; 1978 JNIMethodBlockNode* _next; 1979 1980 public: 1981 1982 JNIMethodBlockNode(int num_methods = min_block_size); 1983 1984 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 1985 1986 void ensure_methods(int num_addl_methods) { 1987 if (_top < _number_of_methods) { 1988 num_addl_methods -= _number_of_methods - _top; 1989 if (num_addl_methods <= 0) { 1990 return; 1991 } 1992 } 1993 if (_next == NULL) { 1994 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 1995 } else { 1996 _next->ensure_methods(num_addl_methods); 1997 } 1998 } 1999 }; 2000 2001 class JNIMethodBlock : public CHeapObj<mtClass> { 2002 JNIMethodBlockNode _head; 2003 JNIMethodBlockNode *_last_free; 2004 public: 2005 static Method* const _free_method; 2006 2007 JNIMethodBlock(int initial_capacity = min_block_size) 2008 : _head(initial_capacity), _last_free(&_head) {} 2009 2010 void ensure_methods(int num_addl_methods) { 2011 _last_free->ensure_methods(num_addl_methods); 2012 } 2013 2014 Method** add_method(Method* m) { 2015 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) { 2016 if (b->_top < b->_number_of_methods) { 2017 // top points to the next free entry. 2018 int i = b->_top; 2019 b->_methods[i] = m; 2020 b->_top++; 2021 _last_free = b; 2022 return &(b->_methods[i]); 2023 } else if (b->_top == b->_number_of_methods) { 2024 // if the next free entry ran off the block see if there's a free entry 2025 for (int i = 0; i < b->_number_of_methods; i++) { 2026 if (b->_methods[i] == _free_method) { 2027 b->_methods[i] = m; 2028 _last_free = b; 2029 return &(b->_methods[i]); 2030 } 2031 } 2032 // Only check each block once for frees. They're very unlikely. 2033 // Increment top past the end of the block. 2034 b->_top++; 2035 } 2036 // need to allocate a next block. 2037 if (b->_next == NULL) { 2038 b->_next = _last_free = new JNIMethodBlockNode(); 2039 } 2040 } 2041 guarantee(false, "Should always allocate a free block"); 2042 return NULL; 2043 } 2044 2045 bool contains(Method** m) { 2046 if (m == NULL) return false; 2047 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2048 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2049 // This is a bit of extra checking, for two reasons. One is 2050 // that contains() deals with pointers that are passed in by 2051 // JNI code, so making sure that the pointer is aligned 2052 // correctly is valuable. The other is that <= and > are 2053 // technically not defined on pointers, so the if guard can 2054 // pass spuriously; no modern compiler is likely to make that 2055 // a problem, though (and if one did, the guard could also 2056 // fail spuriously, which would be bad). 2057 ptrdiff_t idx = m - b->_methods; 2058 if (b->_methods + idx == m) { 2059 return true; 2060 } 2061 } 2062 } 2063 return false; // not found 2064 } 2065 2066 // Doesn't really destroy it, just marks it as free so it can be reused. 2067 void destroy_method(Method** m) { 2068 #ifdef ASSERT 2069 assert(contains(m), "should be a methodID"); 2070 #endif // ASSERT 2071 *m = _free_method; 2072 } 2073 2074 // During class unloading the methods are cleared, which is different 2075 // than freed. 2076 void clear_all_methods() { 2077 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2078 for (int i = 0; i< b->_number_of_methods; i++) { 2079 b->_methods[i] = NULL; 2080 } 2081 } 2082 } 2083 #ifndef PRODUCT 2084 int count_methods() { 2085 // count all allocated methods 2086 int count = 0; 2087 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2088 for (int i = 0; i< b->_number_of_methods; i++) { 2089 if (b->_methods[i] != _free_method) count++; 2090 } 2091 } 2092 return count; 2093 } 2094 #endif // PRODUCT 2095 }; 2096 2097 // Something that can't be mistaken for an address or a markOop 2098 Method* const JNIMethodBlock::_free_method = (Method*)55; 2099 2100 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(NULL) { 2101 _number_of_methods = MAX2(num_methods, min_block_size); 2102 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2103 for (int i = 0; i < _number_of_methods; i++) { 2104 _methods[i] = JNIMethodBlock::_free_method; 2105 } 2106 } 2107 2108 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) { 2109 ClassLoaderData* cld = loader_data; 2110 if (!SafepointSynchronize::is_at_safepoint()) { 2111 // Have to add jmethod_ids() to class loader data thread-safely. 2112 // Also have to add the method to the list safely, which the cld lock 2113 // protects as well. 2114 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2115 if (cld->jmethod_ids() == NULL) { 2116 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2117 } else { 2118 cld->jmethod_ids()->ensure_methods(capacity); 2119 } 2120 } else { 2121 // At safepoint, we are single threaded and can set this. 2122 if (cld->jmethod_ids() == NULL) { 2123 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2124 } else { 2125 cld->jmethod_ids()->ensure_methods(capacity); 2126 } 2127 } 2128 } 2129 2130 // Add a method id to the jmethod_ids 2131 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 2132 ClassLoaderData* cld = loader_data; 2133 2134 if (!SafepointSynchronize::is_at_safepoint()) { 2135 // Have to add jmethod_ids() to class loader data thread-safely. 2136 // Also have to add the method to the list safely, which the cld lock 2137 // protects as well. 2138 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2139 if (cld->jmethod_ids() == NULL) { 2140 cld->set_jmethod_ids(new JNIMethodBlock()); 2141 } 2142 // jmethodID is a pointer to Method* 2143 return (jmethodID)cld->jmethod_ids()->add_method(m); 2144 } else { 2145 // At safepoint, we are single threaded and can set this. 2146 if (cld->jmethod_ids() == NULL) { 2147 cld->set_jmethod_ids(new JNIMethodBlock()); 2148 } 2149 // jmethodID is a pointer to Method* 2150 return (jmethodID)cld->jmethod_ids()->add_method(m); 2151 } 2152 } 2153 2154 // Mark a jmethodID as free. This is called when there is a data race in 2155 // InstanceKlass while creating the jmethodID cache. 2156 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 2157 ClassLoaderData* cld = loader_data; 2158 Method** ptr = (Method**)m; 2159 assert(cld->jmethod_ids() != NULL, "should have method handles"); 2160 cld->jmethod_ids()->destroy_method(ptr); 2161 } 2162 2163 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2164 // Can't assert the method_holder is the same because the new method has the 2165 // scratch method holder. 2166 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2167 == new_method->method_holder()->class_loader(), 2168 "changing to a different class loader"); 2169 // Just change the method in place, jmethodID pointer doesn't change. 2170 *((Method**)jmid) = new_method; 2171 } 2172 2173 bool Method::is_method_id(jmethodID mid) { 2174 Method* m = resolve_jmethod_id(mid); 2175 assert(m != NULL, "should be called with non-null method"); 2176 InstanceKlass* ik = m->method_holder(); 2177 ClassLoaderData* cld = ik->class_loader_data(); 2178 if (cld->jmethod_ids() == NULL) return false; 2179 return (cld->jmethod_ids()->contains((Method**)mid)); 2180 } 2181 2182 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2183 if (mid == NULL) return NULL; 2184 Method* o = resolve_jmethod_id(mid); 2185 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 2186 return NULL; 2187 } 2188 return o; 2189 }; 2190 2191 void Method::set_on_stack(const bool value) { 2192 // Set both the method itself and its constant pool. The constant pool 2193 // on stack means some method referring to it is also on the stack. 2194 constants()->set_on_stack(value); 2195 2196 bool already_set = on_stack(); 2197 _access_flags.set_on_stack(value); 2198 if (value && !already_set) { 2199 MetadataOnStackMark::record(this); 2200 } 2201 } 2202 2203 // Called when the class loader is unloaded to make all methods weak. 2204 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2205 loader_data->jmethod_ids()->clear_all_methods(); 2206 } 2207 2208 bool Method::has_method_vptr(const void* ptr) { 2209 Method m; 2210 // This assumes that the vtbl pointer is the first word of a C++ object. 2211 return dereference_vptr(&m) == dereference_vptr(ptr); 2212 } 2213 2214 // Check that this pointer is valid by checking that the vtbl pointer matches 2215 bool Method::is_valid_method(const Method* m) { 2216 if (m == NULL) { 2217 return false; 2218 } else if ((intptr_t(m) & (wordSize-1)) != 0) { 2219 // Quick sanity check on pointer. 2220 return false; 2221 } else if (m->is_shared()) { 2222 return MetaspaceShared::is_valid_shared_method(m); 2223 } else if (Metaspace::contains_non_shared(m)) { 2224 return has_method_vptr((const void*)m); 2225 } else { 2226 return false; 2227 } 2228 } 2229 2230 #ifndef PRODUCT 2231 void Method::print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) { 2232 out->print(" jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 2233 } 2234 #endif // PRODUCT 2235 2236 2237 // Printing 2238 2239 #ifndef PRODUCT 2240 2241 void Method::print_on(outputStream* st) const { 2242 ResourceMark rm; 2243 assert(is_method(), "must be method"); 2244 st->print_cr("%s", internal_name()); 2245 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this)); 2246 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2247 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants())); 2248 constants()->print_value_on(st); st->cr(); 2249 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2250 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2251 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2252 st->print_cr(" - max stack: %d", max_stack()); 2253 st->print_cr(" - max locals: %d", max_locals()); 2254 st->print_cr(" - size of params: %d", size_of_parameters()); 2255 st->print_cr(" - method size: %d", method_size()); 2256 if (intrinsic_id() != vmIntrinsics::_none) 2257 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 2258 if (highest_comp_level() != CompLevel_none) 2259 st->print_cr(" - highest level: %d", highest_comp_level()); 2260 st->print_cr(" - vtable index: %d", _vtable_index); 2261 if (valid_itable_index()) 2262 st->print_cr(" - itable index: %d", itable_index()); 2263 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry())); 2264 st->print( " - adapters: "); 2265 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2266 if (a == NULL) 2267 st->print_cr(INTPTR_FORMAT, p2i(a)); 2268 else 2269 a->print_adapter_on(st); 2270 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry())); 2271 st->print_cr(" - code size: %d", code_size()); 2272 if (code_size() != 0) { 2273 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base())); 2274 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size())); 2275 } 2276 if (method_data() != NULL) { 2277 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data())); 2278 } 2279 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2280 if (checked_exceptions_length() > 0) { 2281 CheckedExceptionElement* table = checked_exceptions_start(); 2282 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table)); 2283 if (Verbose) { 2284 for (int i = 0; i < checked_exceptions_length(); i++) { 2285 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2286 } 2287 } 2288 } 2289 if (has_linenumber_table()) { 2290 u_char* table = compressed_linenumber_table(); 2291 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table)); 2292 if (Verbose) { 2293 CompressedLineNumberReadStream stream(table); 2294 while (stream.read_pair()) { 2295 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2296 } 2297 } 2298 } 2299 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2300 if (localvariable_table_length() > 0) { 2301 LocalVariableTableElement* table = localvariable_table_start(); 2302 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table)); 2303 if (Verbose) { 2304 for (int i = 0; i < localvariable_table_length(); i++) { 2305 int bci = table[i].start_bci; 2306 int len = table[i].length; 2307 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2308 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2309 int slot = table[i].slot; 2310 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2311 } 2312 } 2313 } 2314 if (code() != NULL) { 2315 st->print (" - compiled code: "); 2316 code()->print_value_on(st); 2317 } 2318 if (is_native()) { 2319 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function())); 2320 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler())); 2321 } 2322 } 2323 2324 void Method::print_linkage_flags(outputStream* st) { 2325 access_flags().print_on(st); 2326 if (is_default_method()) { 2327 st->print("default "); 2328 } 2329 if (is_overpass()) { 2330 st->print("overpass "); 2331 } 2332 } 2333 #endif //PRODUCT 2334 2335 void Method::print_value_on(outputStream* st) const { 2336 assert(is_method(), "must be method"); 2337 st->print("%s", internal_name()); 2338 print_address_on(st); 2339 st->print(" "); 2340 if (WizardMode) access_flags().print_on(st); 2341 name()->print_value_on(st); 2342 st->print(" "); 2343 signature()->print_value_on(st); 2344 st->print(" in "); 2345 method_holder()->print_value_on(st); 2346 if (WizardMode) st->print("#%d", _vtable_index); 2347 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2348 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2349 } 2350 2351 #if INCLUDE_SERVICES 2352 // Size Statistics 2353 void Method::collect_statistics(KlassSizeStats *sz) const { 2354 int mysize = sz->count(this); 2355 sz->_method_bytes += mysize; 2356 sz->_method_all_bytes += mysize; 2357 sz->_rw_bytes += mysize; 2358 2359 if (constMethod()) { 2360 constMethod()->collect_statistics(sz); 2361 } 2362 if (method_data()) { 2363 method_data()->collect_statistics(sz); 2364 } 2365 } 2366 #endif // INCLUDE_SERVICES 2367 2368 // LogTouchedMethods and PrintTouchedMethods 2369 2370 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because 2371 // the Method may be garbage collected. Let's roll our own hash table. 2372 class TouchedMethodRecord : CHeapObj<mtTracing> { 2373 public: 2374 // It's OK to store Symbols here because they will NOT be GC'ed if 2375 // LogTouchedMethods is enabled. 2376 TouchedMethodRecord* _next; 2377 Symbol* _class_name; 2378 Symbol* _method_name; 2379 Symbol* _method_signature; 2380 }; 2381 2382 static const int TOUCHED_METHOD_TABLE_SIZE = 20011; 2383 static TouchedMethodRecord** _touched_method_table = NULL; 2384 2385 void Method::log_touched(TRAPS) { 2386 2387 const int table_size = TOUCHED_METHOD_TABLE_SIZE; 2388 Symbol* my_class = klass_name(); 2389 Symbol* my_name = name(); 2390 Symbol* my_sig = signature(); 2391 2392 unsigned int hash = my_class->identity_hash() + 2393 my_name->identity_hash() + 2394 my_sig->identity_hash(); 2395 juint index = juint(hash) % table_size; 2396 2397 MutexLocker ml(TouchedMethodLog_lock, THREAD); 2398 if (_touched_method_table == NULL) { 2399 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size, 2400 mtTracing, CURRENT_PC); 2401 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size); 2402 } 2403 2404 TouchedMethodRecord* ptr = _touched_method_table[index]; 2405 while (ptr) { 2406 if (ptr->_class_name == my_class && 2407 ptr->_method_name == my_name && 2408 ptr->_method_signature == my_sig) { 2409 return; 2410 } 2411 if (ptr->_next == NULL) break; 2412 ptr = ptr->_next; 2413 } 2414 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing); 2415 my_class->increment_refcount(); 2416 my_name->increment_refcount(); 2417 my_sig->increment_refcount(); 2418 nptr->_class_name = my_class; 2419 nptr->_method_name = my_name; 2420 nptr->_method_signature = my_sig; 2421 nptr->_next = NULL; 2422 2423 if (ptr == NULL) { 2424 // first 2425 _touched_method_table[index] = nptr; 2426 } else { 2427 ptr->_next = nptr; 2428 } 2429 } 2430 2431 void Method::print_touched_methods(outputStream* out) { 2432 MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock); 2433 out->print_cr("# Method::print_touched_methods version 1"); 2434 if (_touched_method_table) { 2435 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) { 2436 TouchedMethodRecord* ptr = _touched_method_table[i]; 2437 while(ptr) { 2438 ptr->_class_name->print_symbol_on(out); out->print("."); 2439 ptr->_method_name->print_symbol_on(out); out->print(":"); 2440 ptr->_method_signature->print_symbol_on(out); out->cr(); 2441 ptr = ptr->_next; 2442 } 2443 } 2444 } 2445 } 2446 2447 // Verification 2448 2449 void Method::verify_on(outputStream* st) { 2450 guarantee(is_method(), "object must be method"); 2451 guarantee(constants()->is_constantPool(), "should be constant pool"); 2452 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 2453 MethodData* md = method_data(); 2454 guarantee(md == NULL || 2455 md->is_methodData(), "should be method data"); 2456 }