1 /* 2 * Copyright (c) 1997, 2013, 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/debugInfoRec.hpp" 29 #include "gc_interface/collectedHeap.inline.hpp" 30 #include "interpreter/bytecodeStream.hpp" 31 #include "interpreter/bytecodeTracer.hpp" 32 #include "interpreter/bytecodes.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "interpreter/oopMapCache.hpp" 35 #include "memory/gcLocker.hpp" 36 #include "memory/generation.hpp" 37 #include "memory/heapInspection.hpp" 38 #include "memory/metadataFactory.hpp" 39 #include "memory/oopFactory.hpp" 40 #include "oops/constMethod.hpp" 41 #include "oops/methodData.hpp" 42 #include "oops/method.hpp" 43 #include "oops/oop.inline.hpp" 44 #include "oops/symbol.hpp" 45 #include "prims/jvmtiExport.hpp" 46 #include "prims/methodHandles.hpp" 47 #include "prims/nativeLookup.hpp" 48 #include "runtime/arguments.hpp" 49 #include "runtime/compilationPolicy.hpp" 50 #include "runtime/frame.inline.hpp" 51 #include "runtime/handles.inline.hpp" 52 #include "runtime/relocator.hpp" 53 #include "runtime/sharedRuntime.hpp" 54 #include "runtime/signature.hpp" 55 #include "utilities/quickSort.hpp" 56 #include "utilities/xmlstream.hpp" 57 58 59 // Implementation of Method 60 61 Method* Method::allocate(ClassLoaderData* loader_data, 62 int byte_code_size, 63 AccessFlags access_flags, 64 InlineTableSizes* sizes, 65 ConstMethod::MethodType method_type, 66 TRAPS) { 67 assert(!access_flags.is_native() || byte_code_size == 0, 68 "native methods should not contain byte codes"); 69 ConstMethod* cm = ConstMethod::allocate(loader_data, 70 byte_code_size, 71 sizes, 72 method_type, 73 CHECK_NULL); 74 75 int size = Method::size(access_flags.is_native()); 76 77 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, size); 78 } 79 80 Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) { 81 No_Safepoint_Verifier no_safepoint; 82 set_constMethod(xconst); 83 set_access_flags(access_flags); 84 set_method_size(size); 85 #ifdef CC_INTERP 86 set_result_index(T_VOID); 87 #endif 88 set_intrinsic_id(vmIntrinsics::_none); 89 set_jfr_towrite(false); 90 set_force_inline(false); 91 set_hidden(false); 92 set_dont_inline(false); 93 set_method_data(NULL); 94 set_method_counters(NULL); 95 set_vtable_index(Method::garbage_vtable_index); 96 97 // Fix and bury in Method* 98 set_interpreter_entry(NULL); // sets i2i entry and from_int 99 set_adapter_entry(NULL); 100 clear_code(); // from_c/from_i get set to c2i/i2i 101 102 if (access_flags.is_native()) { 103 clear_native_function(); 104 set_signature_handler(NULL); 105 } 106 107 NOT_PRODUCT(set_compiled_invocation_count(0);) 108 } 109 110 // Release Method*. The nmethod will be gone when we get here because 111 // we've walked the code cache. 112 void Method::deallocate_contents(ClassLoaderData* loader_data) { 113 MetadataFactory::free_metadata(loader_data, constMethod()); 114 set_constMethod(NULL); 115 MetadataFactory::free_metadata(loader_data, method_data()); 116 set_method_data(NULL); 117 MetadataFactory::free_metadata(loader_data, method_counters()); 118 set_method_counters(NULL); 119 // The nmethod will be gone when we get here. 120 if (code() != NULL) _code = NULL; 121 } 122 123 address Method::get_i2c_entry() { 124 assert(_adapter != NULL, "must have"); 125 return _adapter->get_i2c_entry(); 126 } 127 128 address Method::get_c2i_entry() { 129 assert(_adapter != NULL, "must have"); 130 return _adapter->get_c2i_entry(); 131 } 132 133 address Method::get_c2i_unverified_entry() { 134 assert(_adapter != NULL, "must have"); 135 return _adapter->get_c2i_unverified_entry(); 136 } 137 138 char* Method::name_and_sig_as_C_string() const { 139 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 140 } 141 142 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 143 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 144 } 145 146 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 147 const char* klass_name = klass->external_name(); 148 int klass_name_len = (int)strlen(klass_name); 149 int method_name_len = method_name->utf8_length(); 150 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 151 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 152 strcpy(dest, klass_name); 153 dest[klass_name_len] = '.'; 154 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 155 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 156 dest[len] = 0; 157 return dest; 158 } 159 160 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 161 Symbol* klass_name = klass->name(); 162 klass_name->as_klass_external_name(buf, size); 163 int len = (int)strlen(buf); 164 165 if (len < size - 1) { 166 buf[len++] = '.'; 167 168 method_name->as_C_string(&(buf[len]), size - len); 169 len = (int)strlen(buf); 170 171 signature->as_C_string(&(buf[len]), size - len); 172 } 173 174 return buf; 175 } 176 177 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) { 178 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 179 // access exception table 180 ExceptionTable table(mh()); 181 int length = table.length(); 182 // iterate through all entries sequentially 183 constantPoolHandle pool(THREAD, mh->constants()); 184 for (int i = 0; i < length; i ++) { 185 //reacquire the table in case a GC happened 186 ExceptionTable table(mh()); 187 int beg_bci = table.start_pc(i); 188 int end_bci = table.end_pc(i); 189 assert(beg_bci <= end_bci, "inconsistent exception table"); 190 if (beg_bci <= throw_bci && throw_bci < end_bci) { 191 // exception handler bci range covers throw_bci => investigate further 192 int handler_bci = table.handler_pc(i); 193 int klass_index = table.catch_type_index(i); 194 if (klass_index == 0) { 195 return handler_bci; 196 } else if (ex_klass.is_null()) { 197 return handler_bci; 198 } else { 199 // we know the exception class => get the constraint class 200 // this may require loading of the constraint class; if verification 201 // fails or some other exception occurs, return handler_bci 202 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); 203 KlassHandle klass = KlassHandle(THREAD, k); 204 assert(klass.not_null(), "klass not loaded"); 205 if (ex_klass->is_subtype_of(klass())) { 206 return handler_bci; 207 } 208 } 209 } 210 } 211 212 return -1; 213 } 214 215 void Method::mask_for(int bci, InterpreterOopMap* mask) { 216 217 Thread* myThread = Thread::current(); 218 methodHandle h_this(myThread, this); 219 #ifdef ASSERT 220 bool has_capability = myThread->is_VM_thread() || 221 myThread->is_ConcurrentGC_thread() || 222 myThread->is_GC_task_thread(); 223 224 if (!has_capability) { 225 if (!VerifyStack && !VerifyLastFrame) { 226 // verify stack calls this outside VM thread 227 warning("oopmap should only be accessed by the " 228 "VM, GC task or CMS threads (or during debugging)"); 229 InterpreterOopMap local_mask; 230 method_holder()->mask_for(h_this, bci, &local_mask); 231 local_mask.print(); 232 } 233 } 234 #endif 235 method_holder()->mask_for(h_this, bci, mask); 236 return; 237 } 238 239 240 int Method::bci_from(address bcp) const { 241 #ifdef ASSERT 242 { ResourceMark rm; 243 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), 244 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string())); 245 } 246 #endif 247 return bcp - code_base(); 248 } 249 250 251 // Return (int)bcx if it appears to be a valid BCI. 252 // Return bci_from((address)bcx) if it appears to be a valid BCP. 253 // Return -1 otherwise. 254 // Used by profiling code, when invalid data is a possibility. 255 // The caller is responsible for validating the Method* itself. 256 int Method::validate_bci_from_bcx(intptr_t bcx) const { 257 // keep bci as -1 if not a valid bci 258 int bci = -1; 259 if (bcx == 0 || (address)bcx == code_base()) { 260 // code_size() may return 0 and we allow 0 here 261 // the method may be native 262 bci = 0; 263 } else if (frame::is_bci(bcx)) { 264 if (bcx < code_size()) { 265 bci = (int)bcx; 266 } 267 } else if (contains((address)bcx)) { 268 bci = (address)bcx - code_base(); 269 } 270 // Assert that if we have dodged any asserts, bci is negative. 271 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 272 return bci; 273 } 274 275 address Method::bcp_from(int bci) const { 276 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci"); 277 address bcp = code_base() + bci; 278 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 279 return bcp; 280 } 281 282 283 int Method::size(bool is_native) { 284 // If native, then include pointers for native_function and signature_handler 285 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 286 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; 287 return align_object_size(header_size() + extra_words); 288 } 289 290 291 Symbol* Method::klass_name() const { 292 Klass* k = method_holder(); 293 assert(k->is_klass(), "must be klass"); 294 InstanceKlass* ik = (InstanceKlass*) k; 295 return ik->name(); 296 } 297 298 299 // Attempt to return method oop to original state. Clear any pointers 300 // (to objects outside the shared spaces). We won't be able to predict 301 // where they should point in a new JVM. Further initialize some 302 // entries now in order allow them to be write protected later. 303 304 void Method::remove_unshareable_info() { 305 unlink_method(); 306 } 307 308 309 bool Method::was_executed_more_than(int n) { 310 // Invocation counter is reset when the Method* is compiled. 311 // If the method has compiled code we therefore assume it has 312 // be excuted more than n times. 313 if (is_accessor() || is_empty_method() || (code() != NULL)) { 314 // interpreter doesn't bump invocation counter of trivial methods 315 // compiler does not bump invocation counter of compiled methods 316 return true; 317 } 318 else if ((method_counters() != NULL && 319 method_counters()->invocation_counter()->carry()) || 320 (method_data() != NULL && 321 method_data()->invocation_counter()->carry())) { 322 // The carry bit is set when the counter overflows and causes 323 // a compilation to occur. We don't know how many times 324 // the counter has been reset, so we simply assume it has 325 // been executed more than n times. 326 return true; 327 } else { 328 return invocation_count() > n; 329 } 330 } 331 332 #ifndef PRODUCT 333 void Method::print_invocation_count() { 334 if (is_static()) tty->print("static "); 335 if (is_final()) tty->print("final "); 336 if (is_synchronized()) tty->print("synchronized "); 337 if (is_native()) tty->print("native "); 338 method_holder()->name()->print_symbol_on(tty); 339 tty->print("."); 340 name()->print_symbol_on(tty); 341 signature()->print_symbol_on(tty); 342 343 if (WizardMode) { 344 // dump the size of the byte codes 345 tty->print(" {%d}", code_size()); 346 } 347 tty->cr(); 348 349 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 350 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 351 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 352 if (CountCompiledCalls) { 353 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 354 } 355 356 } 357 #endif 358 359 // Build a MethodData* object to hold information about this method 360 // collected in the interpreter. 361 void Method::build_interpreter_method_data(methodHandle method, TRAPS) { 362 // Do not profile method if current thread holds the pending list lock, 363 // which avoids deadlock for acquiring the MethodData_lock. 364 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) { 365 return; 366 } 367 368 // Grab a lock here to prevent multiple 369 // MethodData*s from being created. 370 MutexLocker ml(MethodData_lock, THREAD); 371 if (method->method_data() == NULL) { 372 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 373 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK); 374 method->set_method_data(method_data); 375 if (PrintMethodData && (Verbose || WizardMode)) { 376 ResourceMark rm(THREAD); 377 tty->print("build_interpreter_method_data for "); 378 method->print_name(tty); 379 tty->cr(); 380 // At the end of the run, the MDO, full of data, will be dumped. 381 } 382 } 383 } 384 385 MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 386 methodHandle mh(m); 387 ClassLoaderData* loader_data = mh->method_holder()->class_loader_data(); 388 MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL); 389 if (mh->method_counters() == NULL) { 390 mh->set_method_counters(counters); 391 } else { 392 MetadataFactory::free_metadata(loader_data, counters); 393 } 394 return mh->method_counters(); 395 } 396 397 void Method::cleanup_inline_caches() { 398 // The current system doesn't use inline caches in the interpreter 399 // => nothing to do (keep this method around for future use) 400 } 401 402 403 int Method::extra_stack_words() { 404 // not an inline function, to avoid a header dependency on Interpreter 405 return extra_stack_entries() * Interpreter::stackElementSize; 406 } 407 408 409 void Method::compute_size_of_parameters(Thread *thread) { 410 ArgumentSizeComputer asc(signature()); 411 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 412 } 413 414 #ifdef CC_INTERP 415 void Method::set_result_index(BasicType type) { 416 _result_index = Interpreter::BasicType_as_index(type); 417 } 418 #endif 419 420 BasicType Method::result_type() const { 421 ResultTypeFinder rtf(signature()); 422 return rtf.type(); 423 } 424 425 426 bool Method::is_empty_method() const { 427 return code_size() == 1 428 && *code_base() == Bytecodes::_return; 429 } 430 431 432 bool Method::is_vanilla_constructor() const { 433 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 434 // which only calls the superclass vanilla constructor and possibly does stores of 435 // zero constants to local fields: 436 // 437 // aload_0 438 // invokespecial 439 // indexbyte1 440 // indexbyte2 441 // 442 // followed by an (optional) sequence of: 443 // 444 // aload_0 445 // aconst_null / iconst_0 / fconst_0 / dconst_0 446 // putfield 447 // indexbyte1 448 // indexbyte2 449 // 450 // followed by: 451 // 452 // return 453 454 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 455 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 456 int size = code_size(); 457 // Check if size match 458 if (size == 0 || size % 5 != 0) return false; 459 address cb = code_base(); 460 int last = size - 1; 461 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 462 // Does not call superclass default constructor 463 return false; 464 } 465 // Check optional sequence 466 for (int i = 4; i < last; i += 5) { 467 if (cb[i] != Bytecodes::_aload_0) return false; 468 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 469 if (cb[i+2] != Bytecodes::_putfield) return false; 470 } 471 return true; 472 } 473 474 475 bool Method::compute_has_loops_flag() { 476 BytecodeStream bcs(this); 477 Bytecodes::Code bc; 478 479 while ((bc = bcs.next()) >= 0) { 480 switch( bc ) { 481 case Bytecodes::_ifeq: 482 case Bytecodes::_ifnull: 483 case Bytecodes::_iflt: 484 case Bytecodes::_ifle: 485 case Bytecodes::_ifne: 486 case Bytecodes::_ifnonnull: 487 case Bytecodes::_ifgt: 488 case Bytecodes::_ifge: 489 case Bytecodes::_if_icmpeq: 490 case Bytecodes::_if_icmpne: 491 case Bytecodes::_if_icmplt: 492 case Bytecodes::_if_icmpgt: 493 case Bytecodes::_if_icmple: 494 case Bytecodes::_if_icmpge: 495 case Bytecodes::_if_acmpeq: 496 case Bytecodes::_if_acmpne: 497 case Bytecodes::_goto: 498 case Bytecodes::_jsr: 499 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 500 break; 501 502 case Bytecodes::_goto_w: 503 case Bytecodes::_jsr_w: 504 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 505 break; 506 } 507 } 508 _access_flags.set_loops_flag_init(); 509 return _access_flags.has_loops(); 510 } 511 512 513 bool Method::is_final_method() const { 514 // %%% Should return true for private methods also, 515 // since there is no way to override them. 516 return is_final() || method_holder()->is_final(); 517 } 518 519 520 bool Method::is_strict_method() const { 521 return is_strict(); 522 } 523 524 525 bool Method::can_be_statically_bound() const { 526 if (is_final_method()) return true; 527 return vtable_index() == nonvirtual_vtable_index; 528 } 529 530 531 bool Method::is_accessor() const { 532 if (code_size() != 5) return false; 533 if (size_of_parameters() != 1) return false; 534 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; 535 if (java_code_at(1) != Bytecodes::_getfield) return false; 536 if (java_code_at(4) != Bytecodes::_areturn && 537 java_code_at(4) != Bytecodes::_ireturn ) return false; 538 return true; 539 } 540 541 542 bool Method::is_initializer() const { 543 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); 544 } 545 546 bool Method::has_valid_initializer_flags() const { 547 return (is_static() || 548 method_holder()->major_version() < 51); 549 } 550 551 bool Method::is_static_initializer() const { 552 // For classfiles version 51 or greater, ensure that the clinit method is 553 // static. Non-static methods with the name "<clinit>" are not static 554 // initializers. (older classfiles exempted for backward compatibility) 555 return name() == vmSymbols::class_initializer_name() && 556 has_valid_initializer_flags(); 557 } 558 559 560 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) { 561 int length = this_oop->checked_exceptions_length(); 562 if (length == 0) { // common case 563 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 564 } else { 565 methodHandle h_this(THREAD, this_oop); 566 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 567 objArrayHandle mirrors (THREAD, m_oop); 568 for (int i = 0; i < length; i++) { 569 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 570 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 571 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 572 mirrors->obj_at_put(i, k->java_mirror()); 573 } 574 return mirrors; 575 } 576 }; 577 578 579 int Method::line_number_from_bci(int bci) const { 580 if (bci == SynchronizationEntryBCI) bci = 0; 581 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 582 int best_bci = 0; 583 int best_line = -1; 584 585 if (has_linenumber_table()) { 586 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 587 // Not necessarily sorted and not necessarily one-to-one. 588 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 589 while (stream.read_pair()) { 590 if (stream.bci() == bci) { 591 // perfect match 592 return stream.line(); 593 } else { 594 // update best_bci/line 595 if (stream.bci() < bci && stream.bci() >= best_bci) { 596 best_bci = stream.bci(); 597 best_line = stream.line(); 598 } 599 } 600 } 601 } 602 return best_line; 603 } 604 605 606 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 607 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 608 Thread *thread = Thread::current(); 609 Symbol* klass_name = constants()->klass_name_at(klass_index); 610 Handle loader(thread, method_holder()->class_loader()); 611 Handle prot (thread, method_holder()->protection_domain()); 612 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 613 } else { 614 return true; 615 } 616 } 617 618 619 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 620 int klass_index = constants()->klass_ref_index_at(refinfo_index); 621 if (must_be_resolved) { 622 // Make sure klass is resolved in constantpool. 623 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 624 } 625 return is_klass_loaded_by_klass_index(klass_index); 626 } 627 628 629 void Method::set_native_function(address function, bool post_event_flag) { 630 assert(function != NULL, "use clear_native_function to unregister natives"); 631 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 632 address* native_function = native_function_addr(); 633 634 // We can see racers trying to place the same native function into place. Once 635 // is plenty. 636 address current = *native_function; 637 if (current == function) return; 638 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 639 function != NULL) { 640 // native_method_throw_unsatisfied_link_error_entry() should only 641 // be passed when post_event_flag is false. 642 assert(function != 643 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 644 "post_event_flag mis-match"); 645 646 // post the bind event, and possible change the bind function 647 JvmtiExport::post_native_method_bind(this, &function); 648 } 649 *native_function = function; 650 // This function can be called more than once. We must make sure that we always 651 // use the latest registered method -> check if a stub already has been generated. 652 // If so, we have to make it not_entrant. 653 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 654 if (nm != NULL) { 655 nm->make_not_entrant(); 656 } 657 } 658 659 660 bool Method::has_native_function() const { 661 if (is_method_handle_intrinsic()) 662 return false; // special-cased in SharedRuntime::generate_native_wrapper 663 address func = native_function(); 664 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 665 } 666 667 668 void Method::clear_native_function() { 669 // Note: is_method_handle_intrinsic() is allowed here. 670 set_native_function( 671 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 672 !native_bind_event_is_interesting); 673 clear_code(); 674 } 675 676 address Method::critical_native_function() { 677 methodHandle mh(this); 678 return NativeLookup::lookup_critical_entry(mh); 679 } 680 681 682 void Method::set_signature_handler(address handler) { 683 address* signature_handler = signature_handler_addr(); 684 *signature_handler = handler; 685 } 686 687 688 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 689 if (PrintCompilation && report) { 690 ttyLocker ttyl; 691 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 692 if (comp_level == CompLevel_all) { 693 tty->print("all levels "); 694 } else { 695 tty->print("levels "); 696 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 697 tty->print("%d ", i); 698 } 699 } 700 this->print_short_name(tty); 701 int size = this->code_size(); 702 if (size > 0) { 703 tty->print(" (%d bytes)", size); 704 } 705 if (reason != NULL) { 706 tty->print(" %s", reason); 707 } 708 tty->cr(); 709 } 710 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 711 ttyLocker ttyl; 712 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'", 713 is_osr ? "osr_" : "", os::current_thread_id()); 714 if (reason != NULL) { 715 xtty->print(" reason=\'%s\'", reason); 716 } 717 xtty->method(this); 718 xtty->stamp(); 719 xtty->end_elem(); 720 } 721 } 722 723 bool Method::is_always_compilable() const { 724 // Generated adapters must be compiled 725 if (is_method_handle_intrinsic() && is_synthetic()) { 726 assert(!is_not_c1_compilable(), "sanity check"); 727 assert(!is_not_c2_compilable(), "sanity check"); 728 return true; 729 } 730 731 return false; 732 } 733 734 bool Method::is_not_compilable(int comp_level) const { 735 if (number_of_breakpoints() > 0) 736 return true; 737 if (is_always_compilable()) 738 return false; 739 if (comp_level == CompLevel_any) 740 return is_not_c1_compilable() || is_not_c2_compilable(); 741 if (is_c1_compile(comp_level)) 742 return is_not_c1_compilable(); 743 if (is_c2_compile(comp_level)) 744 return is_not_c2_compilable(); 745 return false; 746 } 747 748 // call this when compiler finds that this method is not compilable 749 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 750 if (is_always_compilable()) { 751 // Don't mark a method which should be always compilable 752 return; 753 } 754 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 755 if (comp_level == CompLevel_all) { 756 set_not_c1_compilable(); 757 set_not_c2_compilable(); 758 } else { 759 if (is_c1_compile(comp_level)) 760 set_not_c1_compilable(); 761 if (is_c2_compile(comp_level)) 762 set_not_c2_compilable(); 763 } 764 CompilationPolicy::policy()->disable_compilation(this); 765 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 766 } 767 768 bool Method::is_not_osr_compilable(int comp_level) const { 769 if (is_not_compilable(comp_level)) 770 return true; 771 if (comp_level == CompLevel_any) 772 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 773 if (is_c1_compile(comp_level)) 774 return is_not_c1_osr_compilable(); 775 if (is_c2_compile(comp_level)) 776 return is_not_c2_osr_compilable(); 777 return false; 778 } 779 780 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 781 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 782 if (comp_level == CompLevel_all) { 783 set_not_c1_osr_compilable(); 784 set_not_c2_osr_compilable(); 785 } else { 786 if (is_c1_compile(comp_level)) 787 set_not_c1_osr_compilable(); 788 if (is_c2_compile(comp_level)) 789 set_not_c2_osr_compilable(); 790 } 791 CompilationPolicy::policy()->disable_compilation(this); 792 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 793 } 794 795 // Revert to using the interpreter and clear out the nmethod 796 void Method::clear_code() { 797 798 // this may be NULL if c2i adapters have not been made yet 799 // Only should happen at allocate time. 800 if (_adapter == NULL) { 801 _from_compiled_entry = NULL; 802 } else { 803 _from_compiled_entry = _adapter->get_c2i_entry(); 804 } 805 OrderAccess::storestore(); 806 _from_interpreted_entry = _i2i_entry; 807 OrderAccess::storestore(); 808 _code = NULL; 809 } 810 811 // Called by class data sharing to remove any entry points (which are not shared) 812 void Method::unlink_method() { 813 _code = NULL; 814 _i2i_entry = NULL; 815 _from_interpreted_entry = NULL; 816 if (is_native()) { 817 *native_function_addr() = NULL; 818 set_signature_handler(NULL); 819 } 820 NOT_PRODUCT(set_compiled_invocation_count(0);) 821 _adapter = NULL; 822 _from_compiled_entry = NULL; 823 824 // In case of DumpSharedSpaces, _method_data should always be NULL. 825 // 826 // During runtime (!DumpSharedSpaces), when we are cleaning a 827 // shared class that failed to load, this->link_method() may 828 // have already been called (before an exception happened), so 829 // this->_method_data may not be NULL. 830 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?"); 831 832 set_method_data(NULL); 833 set_method_counters(NULL); 834 } 835 836 // Called when the method_holder is getting linked. Setup entrypoints so the method 837 // is ready to be called from interpreter, compiler, and vtables. 838 void Method::link_method(methodHandle h_method, TRAPS) { 839 // If the code cache is full, we may reenter this function for the 840 // leftover methods that weren't linked. 841 if (_i2i_entry != NULL) return; 842 843 assert(_adapter == NULL, "init'd to NULL" ); 844 assert( _code == NULL, "nothing compiled yet" ); 845 846 // Setup interpreter entrypoint 847 assert(this == h_method(), "wrong h_method()" ); 848 address entry = Interpreter::entry_for_method(h_method); 849 assert(entry != NULL, "interpreter entry must be non-null"); 850 // Sets both _i2i_entry and _from_interpreted_entry 851 set_interpreter_entry(entry); 852 853 // Don't overwrite already registered native entries. 854 if (is_native() && !has_native_function()) { 855 set_native_function( 856 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 857 !native_bind_event_is_interesting); 858 } 859 860 // Setup compiler entrypoint. This is made eagerly, so we do not need 861 // special handling of vtables. An alternative is to make adapters more 862 // lazily by calling make_adapter() from from_compiled_entry() for the 863 // normal calls. For vtable calls life gets more complicated. When a 864 // call-site goes mega-morphic we need adapters in all methods which can be 865 // called from the vtable. We need adapters on such methods that get loaded 866 // later. Ditto for mega-morphic itable calls. If this proves to be a 867 // problem we'll make these lazily later. 868 (void) make_adapters(h_method, CHECK); 869 870 // ONLY USE the h_method now as make_adapter may have blocked 871 872 } 873 874 address Method::make_adapters(methodHandle mh, TRAPS) { 875 // Adapters for compiled code are made eagerly here. They are fairly 876 // small (generally < 100 bytes) and quick to make (and cached and shared) 877 // so making them eagerly shouldn't be too expensive. 878 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 879 if (adapter == NULL ) { 880 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); 881 } 882 883 mh->set_adapter_entry(adapter); 884 mh->_from_compiled_entry = adapter->get_c2i_entry(); 885 return adapter->get_c2i_entry(); 886 } 887 888 // The verified_code_entry() must be called when a invoke is resolved 889 // on this method. 890 891 // It returns the compiled code entry point, after asserting not null. 892 // This function is called after potential safepoints so that nmethod 893 // or adapter that it points to is still live and valid. 894 // This function must not hit a safepoint! 895 address Method::verified_code_entry() { 896 debug_only(No_Safepoint_Verifier nsv;) 897 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 898 if (code == NULL && UseCodeCacheFlushing) { 899 nmethod *saved_code = CodeCache::reanimate_saved_code(this); 900 if (saved_code != NULL) { 901 methodHandle method(this); 902 assert( ! saved_code->is_osr_method(), "should not get here for osr" ); 903 set_code( method, saved_code ); 904 } 905 } 906 907 assert(_from_compiled_entry != NULL, "must be set"); 908 return _from_compiled_entry; 909 } 910 911 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 912 // (could be racing a deopt). 913 // Not inline to avoid circular ref. 914 bool Method::check_code() const { 915 // cached in a register or local. There's a race on the value of the field. 916 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 917 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 918 } 919 920 // Install compiled code. Instantly it can execute. 921 void Method::set_code(methodHandle mh, nmethod *code) { 922 assert( code, "use clear_code to remove code" ); 923 assert( mh->check_code(), "" ); 924 925 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 926 927 // These writes must happen in this order, because the interpreter will 928 // directly jump to from_interpreted_entry which jumps to an i2c adapter 929 // which jumps to _from_compiled_entry. 930 mh->_code = code; // Assign before allowing compiled code to exec 931 932 int comp_level = code->comp_level(); 933 // In theory there could be a race here. In practice it is unlikely 934 // and not worth worrying about. 935 if (comp_level > mh->highest_comp_level()) { 936 mh->set_highest_comp_level(comp_level); 937 } 938 939 OrderAccess::storestore(); 940 #ifdef SHARK 941 mh->_from_interpreted_entry = code->insts_begin(); 942 #else //!SHARK 943 mh->_from_compiled_entry = code->verified_entry_point(); 944 OrderAccess::storestore(); 945 // Instantly compiled code can execute. 946 if (!mh->is_method_handle_intrinsic()) 947 mh->_from_interpreted_entry = mh->get_i2c_entry(); 948 #endif //!SHARK 949 } 950 951 952 bool Method::is_overridden_in(Klass* k) const { 953 InstanceKlass* ik = InstanceKlass::cast(k); 954 955 if (ik->is_interface()) return false; 956 957 // If method is an interface, we skip it - except if it 958 // is a miranda method 959 if (method_holder()->is_interface()) { 960 // Check that method is not a miranda method 961 if (ik->lookup_method(name(), signature()) == NULL) { 962 // No implementation exist - so miranda method 963 return false; 964 } 965 return true; 966 } 967 968 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 969 assert(ik->vtable() != NULL, "vtable should exist"); 970 if (vtable_index() == nonvirtual_vtable_index) { 971 return false; 972 } else { 973 Method* vt_m = ik->method_at_vtable(vtable_index()); 974 return vt_m != this; 975 } 976 } 977 978 979 // give advice about whether this Method* should be cached or not 980 bool Method::should_not_be_cached() const { 981 if (is_old()) { 982 // This method has been redefined. It is either EMCP or obsolete 983 // and we don't want to cache it because that would pin the method 984 // down and prevent it from being collectible if and when it 985 // finishes executing. 986 return true; 987 } 988 989 // caching this method should be just fine 990 return false; 991 } 992 993 994 /** 995 * Returns true if this is one of the specially treated methods for 996 * security related stack walks (like Reflection.getCallerClass). 997 */ 998 bool Method::is_ignored_by_security_stack_walk() const { 999 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection; 1000 1001 if (intrinsic_id() == vmIntrinsics::_invoke) { 1002 // This is Method.invoke() -- ignore it 1003 return true; 1004 } 1005 if (use_new_reflection && 1006 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1007 // This is an auxilary frame -- ignore it 1008 return true; 1009 } 1010 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1011 // This is an internal adapter frame for method handles -- ignore it 1012 return true; 1013 } 1014 return false; 1015 } 1016 1017 1018 // Constant pool structure for invoke methods: 1019 enum { 1020 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1021 _imcp_invoke_signature, // utf8: (variable Symbol*) 1022 _imcp_limit 1023 }; 1024 1025 // Test if this method is an MH adapter frame generated by Java code. 1026 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1027 bool Method::is_compiled_lambda_form() const { 1028 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1029 } 1030 1031 // Test if this method is an internal MH primitive method. 1032 bool Method::is_method_handle_intrinsic() const { 1033 vmIntrinsics::ID iid = intrinsic_id(); 1034 return (MethodHandles::is_signature_polymorphic(iid) && 1035 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1036 } 1037 1038 bool Method::has_member_arg() const { 1039 vmIntrinsics::ID iid = intrinsic_id(); 1040 return (MethodHandles::is_signature_polymorphic(iid) && 1041 MethodHandles::has_member_arg(iid)); 1042 } 1043 1044 // Make an instance of a signature-polymorphic internal MH primitive. 1045 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1046 Symbol* signature, 1047 TRAPS) { 1048 ResourceMark rm; 1049 methodHandle empty; 1050 1051 KlassHandle holder = SystemDictionary::MethodHandle_klass(); 1052 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1053 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1054 if (TraceMethodHandles) { 1055 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1056 } 1057 1058 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1059 name->increment_refcount(); 1060 signature->increment_refcount(); 1061 1062 int cp_length = _imcp_limit; 1063 ClassLoaderData* loader_data = holder->class_loader_data(); 1064 constantPoolHandle cp; 1065 { 1066 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1067 cp = constantPoolHandle(THREAD, cp_oop); 1068 } 1069 cp->set_pool_holder(InstanceKlass::cast(holder())); 1070 cp->symbol_at_put(_imcp_invoke_name, name); 1071 cp->symbol_at_put(_imcp_invoke_signature, signature); 1072 cp->set_has_preresolution(); 1073 1074 // decide on access bits: public or not? 1075 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1076 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1077 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1078 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1079 1080 methodHandle m; 1081 { 1082 InlineTableSizes sizes; 1083 Method* m_oop = Method::allocate(loader_data, 0, 1084 accessFlags_from(flags_bits), &sizes, 1085 ConstMethod::NORMAL, CHECK_(empty)); 1086 m = methodHandle(THREAD, m_oop); 1087 } 1088 m->set_constants(cp()); 1089 m->set_name_index(_imcp_invoke_name); 1090 m->set_signature_index(_imcp_invoke_signature); 1091 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1092 assert(m->signature() == signature, ""); 1093 #ifdef CC_INTERP 1094 ResultTypeFinder rtf(signature); 1095 m->set_result_index(rtf.type()); 1096 #endif 1097 m->compute_size_of_parameters(THREAD); 1098 m->init_intrinsic_id(); 1099 assert(m->is_method_handle_intrinsic(), ""); 1100 #ifdef ASSERT 1101 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1102 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1103 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1104 #endif //ASSERT 1105 1106 // Finally, set up its entry points. 1107 assert(m->can_be_statically_bound(), ""); 1108 m->set_vtable_index(Method::nonvirtual_vtable_index); 1109 m->link_method(m, CHECK_(empty)); 1110 1111 if (TraceMethodHandles && (Verbose || WizardMode)) 1112 m->print_on(tty); 1113 1114 return m; 1115 } 1116 1117 Klass* Method::check_non_bcp_klass(Klass* klass) { 1118 if (klass != NULL && klass->class_loader() != NULL) { 1119 if (klass->oop_is_objArray()) 1120 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1121 return klass; 1122 } 1123 return NULL; 1124 } 1125 1126 1127 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1128 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1129 // Code below does not work for native methods - they should never get rewritten anyway 1130 assert(!m->is_native(), "cannot rewrite native methods"); 1131 // Allocate new Method* 1132 AccessFlags flags = m->access_flags(); 1133 1134 ConstMethod* cm = m->constMethod(); 1135 int checked_exceptions_len = cm->checked_exceptions_length(); 1136 int localvariable_len = cm->localvariable_table_length(); 1137 int exception_table_len = cm->exception_table_length(); 1138 int method_parameters_len = cm->method_parameters_length(); 1139 int method_annotations_len = cm->method_annotations_length(); 1140 int parameter_annotations_len = cm->parameter_annotations_length(); 1141 int type_annotations_len = cm->type_annotations_length(); 1142 int default_annotations_len = cm->default_annotations_length(); 1143 1144 InlineTableSizes sizes( 1145 localvariable_len, 1146 new_compressed_linenumber_size, 1147 exception_table_len, 1148 checked_exceptions_len, 1149 method_parameters_len, 1150 cm->generic_signature_index(), 1151 method_annotations_len, 1152 parameter_annotations_len, 1153 type_annotations_len, 1154 default_annotations_len, 1155 0); 1156 1157 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1158 Method* newm_oop = Method::allocate(loader_data, 1159 new_code_length, 1160 flags, 1161 &sizes, 1162 m->method_type(), 1163 CHECK_(methodHandle())); 1164 methodHandle newm (THREAD, newm_oop); 1165 int new_method_size = newm->method_size(); 1166 1167 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1168 ConstMethod* newcm = newm->constMethod(); 1169 int new_const_method_size = newm->constMethod()->size(); 1170 1171 memcpy(newm(), m(), sizeof(Method)); 1172 1173 // Create shallow copy of ConstMethod. 1174 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1175 1176 // Reset correct method/const method, method size, and parameter info 1177 newm->set_constMethod(newcm); 1178 newm->constMethod()->set_code_size(new_code_length); 1179 newm->constMethod()->set_constMethod_size(new_const_method_size); 1180 newm->set_method_size(new_method_size); 1181 assert(newm->code_size() == new_code_length, "check"); 1182 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1183 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1184 assert(newm->exception_table_length() == exception_table_len, "check"); 1185 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1186 // Copy new byte codes 1187 memcpy(newm->code_base(), new_code, new_code_length); 1188 // Copy line number table 1189 if (new_compressed_linenumber_size > 0) { 1190 memcpy(newm->compressed_linenumber_table(), 1191 new_compressed_linenumber_table, 1192 new_compressed_linenumber_size); 1193 } 1194 // Copy method_parameters 1195 if (method_parameters_len > 0) { 1196 memcpy(newm->method_parameters_start(), 1197 m->method_parameters_start(), 1198 method_parameters_len * sizeof(MethodParametersElement)); 1199 } 1200 // Copy checked_exceptions 1201 if (checked_exceptions_len > 0) { 1202 memcpy(newm->checked_exceptions_start(), 1203 m->checked_exceptions_start(), 1204 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1205 } 1206 // Copy exception table 1207 if (exception_table_len > 0) { 1208 memcpy(newm->exception_table_start(), 1209 m->exception_table_start(), 1210 exception_table_len * sizeof(ExceptionTableElement)); 1211 } 1212 // Copy local variable number table 1213 if (localvariable_len > 0) { 1214 memcpy(newm->localvariable_table_start(), 1215 m->localvariable_table_start(), 1216 localvariable_len * sizeof(LocalVariableTableElement)); 1217 } 1218 // Copy stackmap table 1219 if (m->has_stackmap_table()) { 1220 int code_attribute_length = m->stackmap_data()->length(); 1221 Array<u1>* stackmap_data = 1222 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1223 memcpy((void*)stackmap_data->adr_at(0), 1224 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1225 newm->set_stackmap_data(stackmap_data); 1226 } 1227 1228 // copy annotations over to new method 1229 newcm->copy_annotations_from(cm); 1230 return newm; 1231 } 1232 1233 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) { 1234 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1235 // because we are not loading from core libraries 1236 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1237 // which does not use the class default class loader so we check for its loader here 1238 InstanceKlass* ik = InstanceKlass::cast(holder); 1239 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) { 1240 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1241 } 1242 1243 // see if the klass name is well-known: 1244 Symbol* klass_name = ik->name(); 1245 return vmSymbols::find_sid(klass_name); 1246 } 1247 1248 void Method::init_intrinsic_id() { 1249 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1250 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1251 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1252 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1253 1254 // the klass name is well-known: 1255 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1256 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1257 1258 // ditto for method and signature: 1259 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1260 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1261 && name_id == vmSymbols::NO_SID) 1262 return; 1263 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1264 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1265 && sig_id == vmSymbols::NO_SID) return; 1266 jshort flags = access_flags().as_short(); 1267 1268 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1269 if (id != vmIntrinsics::_none) { 1270 set_intrinsic_id(id); 1271 return; 1272 } 1273 1274 // A few slightly irregular cases: 1275 switch (klass_id) { 1276 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1277 // Second chance: check in regular Math. 1278 switch (name_id) { 1279 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1280 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1281 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1282 // pretend it is the corresponding method in the non-strict class: 1283 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1284 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1285 break; 1286 } 1287 break; 1288 1289 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. 1290 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1291 if (!is_native()) break; 1292 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1293 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1294 id = vmIntrinsics::_none; 1295 break; 1296 } 1297 1298 if (id != vmIntrinsics::_none) { 1299 // Set up its iid. It is an alias method. 1300 set_intrinsic_id(id); 1301 return; 1302 } 1303 } 1304 1305 // These two methods are static since a GC may move the Method 1306 bool Method::load_signature_classes(methodHandle m, TRAPS) { 1307 if (THREAD->is_Compiler_thread()) { 1308 // There is nothing useful this routine can do from within the Compile thread. 1309 // Hopefully, the signature contains only well-known classes. 1310 // We could scan for this and return true/false, but the caller won't care. 1311 return false; 1312 } 1313 bool sig_is_loaded = true; 1314 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1315 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1316 ResourceMark rm(THREAD); 1317 Symbol* signature = m->signature(); 1318 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1319 if (ss.is_object()) { 1320 Symbol* sym = ss.as_symbol(CHECK_(false)); 1321 Symbol* name = sym; 1322 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1323 protection_domain, THREAD); 1324 // We are loading classes eagerly. If a ClassNotFoundException or 1325 // a LinkageError was generated, be sure to ignore it. 1326 if (HAS_PENDING_EXCEPTION) { 1327 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1328 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1329 CLEAR_PENDING_EXCEPTION; 1330 } else { 1331 return false; 1332 } 1333 } 1334 if( klass == NULL) { sig_is_loaded = false; } 1335 } 1336 } 1337 return sig_is_loaded; 1338 } 1339 1340 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1341 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1342 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1343 ResourceMark rm(THREAD); 1344 Symbol* signature = m->signature(); 1345 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1346 if (ss.type() == T_OBJECT) { 1347 Symbol* name = ss.as_symbol_or_null(); 1348 if (name == NULL) return true; 1349 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1350 if (klass == NULL) return true; 1351 } 1352 } 1353 return false; 1354 } 1355 1356 // Exposed so field engineers can debug VM 1357 void Method::print_short_name(outputStream* st) { 1358 ResourceMark rm; 1359 #ifdef PRODUCT 1360 st->print(" %s::", method_holder()->external_name()); 1361 #else 1362 st->print(" %s::", method_holder()->internal_name()); 1363 #endif 1364 name()->print_symbol_on(st); 1365 if (WizardMode) signature()->print_symbol_on(st); 1366 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1367 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1368 } 1369 1370 // Comparer for sorting an object array containing 1371 // Method*s. 1372 static int method_comparator(Method* a, Method* b) { 1373 return a->name()->fast_compare(b->name()); 1374 } 1375 1376 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1377 void Method::sort_methods(Array<Method*>* methods, bool idempotent) { 1378 int length = methods->length(); 1379 if (length > 1) { 1380 { 1381 No_Safepoint_Verifier nsv; 1382 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); 1383 } 1384 // Reset method ordering 1385 for (int i = 0; i < length; i++) { 1386 Method* m = methods->at(i); 1387 m->set_method_idnum(i); 1388 } 1389 } 1390 } 1391 1392 1393 //----------------------------------------------------------------------------------- 1394 // Non-product code unless JVM/TI needs it 1395 1396 #if !defined(PRODUCT) || INCLUDE_JVMTI 1397 class SignatureTypePrinter : public SignatureTypeNames { 1398 private: 1399 outputStream* _st; 1400 bool _use_separator; 1401 1402 void type_name(const char* name) { 1403 if (_use_separator) _st->print(", "); 1404 _st->print(name); 1405 _use_separator = true; 1406 } 1407 1408 public: 1409 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1410 _st = st; 1411 _use_separator = false; 1412 } 1413 1414 void print_parameters() { _use_separator = false; iterate_parameters(); } 1415 void print_returntype() { _use_separator = false; iterate_returntype(); } 1416 }; 1417 1418 1419 void Method::print_name(outputStream* st) { 1420 Thread *thread = Thread::current(); 1421 ResourceMark rm(thread); 1422 SignatureTypePrinter sig(signature(), st); 1423 st->print("%s ", is_static() ? "static" : "virtual"); 1424 sig.print_returntype(); 1425 st->print(" %s.", method_holder()->internal_name()); 1426 name()->print_symbol_on(st); 1427 st->print("("); 1428 sig.print_parameters(); 1429 st->print(")"); 1430 } 1431 #endif // !PRODUCT || INCLUDE_JVMTI 1432 1433 1434 //----------------------------------------------------------------------------------- 1435 // Non-product code 1436 1437 #ifndef PRODUCT 1438 void Method::print_codes_on(outputStream* st) const { 1439 print_codes_on(0, code_size(), st); 1440 } 1441 1442 void Method::print_codes_on(int from, int to, outputStream* st) const { 1443 Thread *thread = Thread::current(); 1444 ResourceMark rm(thread); 1445 methodHandle mh (thread, (Method*)this); 1446 BytecodeStream s(mh); 1447 s.set_interval(from, to); 1448 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1449 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1450 } 1451 #endif // not PRODUCT 1452 1453 1454 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1455 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1456 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1457 // as end-of-stream terminator. 1458 1459 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1460 // bci and line number does not compress into single byte. 1461 // Write out escape character and use regular compression for bci and line number. 1462 write_byte((jubyte)0xFF); 1463 write_signed_int(bci_delta); 1464 write_signed_int(line_delta); 1465 } 1466 1467 // See comment in method.hpp which explains why this exists. 1468 #if defined(_M_AMD64) && _MSC_VER >= 1400 1469 #pragma optimize("", off) 1470 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1471 write_pair_inline(bci, line); 1472 } 1473 #pragma optimize("", on) 1474 #endif 1475 1476 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1477 _bci = 0; 1478 _line = 0; 1479 }; 1480 1481 1482 bool CompressedLineNumberReadStream::read_pair() { 1483 jubyte next = read_byte(); 1484 // Check for terminator 1485 if (next == 0) return false; 1486 if (next == 0xFF) { 1487 // Escape character, regular compression used 1488 _bci += read_signed_int(); 1489 _line += read_signed_int(); 1490 } else { 1491 // Single byte compression used 1492 _bci += next >> 3; 1493 _line += next & 0x7; 1494 } 1495 return true; 1496 } 1497 1498 1499 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1500 BreakpointInfo* bp = method_holder()->breakpoints(); 1501 for (; bp != NULL; bp = bp->next()) { 1502 if (bp->match(this, bci)) { 1503 return bp->orig_bytecode(); 1504 } 1505 } 1506 ShouldNotReachHere(); 1507 return Bytecodes::_shouldnotreachhere; 1508 } 1509 1510 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1511 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1512 BreakpointInfo* bp = method_holder()->breakpoints(); 1513 for (; bp != NULL; bp = bp->next()) { 1514 if (bp->match(this, bci)) { 1515 bp->set_orig_bytecode(code); 1516 // and continue, in case there is more than one 1517 } 1518 } 1519 } 1520 1521 void Method::set_breakpoint(int bci) { 1522 InstanceKlass* ik = method_holder(); 1523 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1524 bp->set_next(ik->breakpoints()); 1525 ik->set_breakpoints(bp); 1526 // do this last: 1527 bp->set(this); 1528 } 1529 1530 static void clear_matches(Method* m, int bci) { 1531 InstanceKlass* ik = m->method_holder(); 1532 BreakpointInfo* prev_bp = NULL; 1533 BreakpointInfo* next_bp; 1534 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1535 next_bp = bp->next(); 1536 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1537 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1538 // do this first: 1539 bp->clear(m); 1540 // unhook it 1541 if (prev_bp != NULL) 1542 prev_bp->set_next(next_bp); 1543 else 1544 ik->set_breakpoints(next_bp); 1545 delete bp; 1546 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1547 // at same location. So we have multiple matching (method_index and bci) 1548 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1549 // breakpoint for clear_breakpoint request and keep all other method versions 1550 // BreakpointInfo for future clear_breakpoint request. 1551 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1552 // which is being called when class is unloaded. We delete all the Breakpoint 1553 // information for all versions of method. We may not correctly restore the original 1554 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1555 // so these methods won't be used anymore. 1556 if (bci >= 0) { 1557 break; 1558 } 1559 } else { 1560 // This one is a keeper. 1561 prev_bp = bp; 1562 } 1563 } 1564 } 1565 1566 void Method::clear_breakpoint(int bci) { 1567 assert(bci >= 0, ""); 1568 clear_matches(this, bci); 1569 } 1570 1571 void Method::clear_all_breakpoints() { 1572 clear_matches(this, -1); 1573 } 1574 1575 1576 int Method::invocation_count() { 1577 MethodCounters *mcs = method_counters(); 1578 if (TieredCompilation) { 1579 MethodData* const mdo = method_data(); 1580 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1581 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1582 return InvocationCounter::count_limit; 1583 } else { 1584 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1585 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1586 } 1587 } else { 1588 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1589 } 1590 } 1591 1592 int Method::backedge_count() { 1593 MethodCounters *mcs = method_counters(); 1594 if (TieredCompilation) { 1595 MethodData* const mdo = method_data(); 1596 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1597 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1598 return InvocationCounter::count_limit; 1599 } else { 1600 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1601 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1602 } 1603 } else { 1604 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1605 } 1606 } 1607 1608 int Method::highest_comp_level() const { 1609 const MethodData* mdo = method_data(); 1610 if (mdo != NULL) { 1611 return mdo->highest_comp_level(); 1612 } else { 1613 return CompLevel_none; 1614 } 1615 } 1616 1617 int Method::highest_osr_comp_level() const { 1618 const MethodData* mdo = method_data(); 1619 if (mdo != NULL) { 1620 return mdo->highest_osr_comp_level(); 1621 } else { 1622 return CompLevel_none; 1623 } 1624 } 1625 1626 void Method::set_highest_comp_level(int level) { 1627 MethodData* mdo = method_data(); 1628 if (mdo != NULL) { 1629 mdo->set_highest_comp_level(level); 1630 } 1631 } 1632 1633 void Method::set_highest_osr_comp_level(int level) { 1634 MethodData* mdo = method_data(); 1635 if (mdo != NULL) { 1636 mdo->set_highest_osr_comp_level(level); 1637 } 1638 } 1639 1640 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1641 _bci = bci; 1642 _name_index = m->name_index(); 1643 _signature_index = m->signature_index(); 1644 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1645 if (_orig_bytecode == Bytecodes::_breakpoint) 1646 _orig_bytecode = m->orig_bytecode_at(_bci); 1647 _next = NULL; 1648 } 1649 1650 void BreakpointInfo::set(Method* method) { 1651 #ifdef ASSERT 1652 { 1653 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1654 if (code == Bytecodes::_breakpoint) 1655 code = method->orig_bytecode_at(_bci); 1656 assert(orig_bytecode() == code, "original bytecode must be the same"); 1657 } 1658 #endif 1659 Thread *thread = Thread::current(); 1660 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1661 method->incr_number_of_breakpoints(thread); 1662 SystemDictionary::notice_modification(); 1663 { 1664 // Deoptimize all dependents on this method 1665 HandleMark hm(thread); 1666 methodHandle mh(thread, method); 1667 Universe::flush_dependents_on_method(mh); 1668 } 1669 } 1670 1671 void BreakpointInfo::clear(Method* method) { 1672 *method->bcp_from(_bci) = orig_bytecode(); 1673 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1674 method->decr_number_of_breakpoints(Thread::current()); 1675 } 1676 1677 // jmethodID handling 1678 1679 // This is a block allocating object, sort of like JNIHandleBlock, only a 1680 // lot simpler. There aren't many of these, they aren't long, they are rarely 1681 // deleted and so we can do some suboptimal things. 1682 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1683 // never get rid of it. 1684 // It would be nice to be able to parameterize the number of methods for 1685 // the null_class_loader but then we'd have to turn this and ClassLoaderData 1686 // into templates. 1687 1688 // I feel like this brain dead class should exist somewhere in the STL 1689 1690 class JNIMethodBlock : public CHeapObj<mtClass> { 1691 enum { number_of_methods = 8 }; 1692 1693 Method* _methods[number_of_methods]; 1694 int _top; 1695 JNIMethodBlock* _next; 1696 public: 1697 static Method* const _free_method; 1698 1699 JNIMethodBlock() : _next(NULL), _top(0) { 1700 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method; 1701 } 1702 1703 Method** add_method(Method* m) { 1704 if (_top < number_of_methods) { 1705 // top points to the next free entry. 1706 int i = _top; 1707 _methods[i] = m; 1708 _top++; 1709 return &_methods[i]; 1710 } else if (_top == number_of_methods) { 1711 // if the next free entry ran off the block see if there's a free entry 1712 for (int i = 0; i< number_of_methods; i++) { 1713 if (_methods[i] == _free_method) { 1714 _methods[i] = m; 1715 return &_methods[i]; 1716 } 1717 } 1718 // Only check each block once for frees. They're very unlikely. 1719 // Increment top past the end of the block. 1720 _top++; 1721 } 1722 // need to allocate a next block. 1723 if (_next == NULL) { 1724 _next = new JNIMethodBlock(); 1725 } 1726 return _next->add_method(m); 1727 } 1728 1729 bool contains(Method** m) { 1730 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1731 for (int i = 0; i< number_of_methods; i++) { 1732 if (&(b->_methods[i]) == m) { 1733 return true; 1734 } 1735 } 1736 } 1737 return false; // not found 1738 } 1739 1740 // Doesn't really destroy it, just marks it as free so it can be reused. 1741 void destroy_method(Method** m) { 1742 #ifdef ASSERT 1743 assert(contains(m), "should be a methodID"); 1744 #endif // ASSERT 1745 *m = _free_method; 1746 } 1747 1748 // During class unloading the methods are cleared, which is different 1749 // than freed. 1750 void clear_all_methods() { 1751 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1752 for (int i = 0; i< number_of_methods; i++) { 1753 _methods[i] = NULL; 1754 } 1755 } 1756 } 1757 #ifndef PRODUCT 1758 int count_methods() { 1759 // count all allocated methods 1760 int count = 0; 1761 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1762 for (int i = 0; i< number_of_methods; i++) { 1763 if (_methods[i] != _free_method) count++; 1764 } 1765 } 1766 return count; 1767 } 1768 #endif // PRODUCT 1769 }; 1770 1771 // Something that can't be mistaken for an address or a markOop 1772 Method* const JNIMethodBlock::_free_method = (Method*)55; 1773 1774 // Add a method id to the jmethod_ids 1775 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 1776 ClassLoaderData* cld = loader_data; 1777 1778 if (!SafepointSynchronize::is_at_safepoint()) { 1779 // Have to add jmethod_ids() to class loader data thread-safely. 1780 // Also have to add the method to the list safely, which the cld lock 1781 // protects as well. 1782 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 1783 if (cld->jmethod_ids() == NULL) { 1784 cld->set_jmethod_ids(new JNIMethodBlock()); 1785 } 1786 // jmethodID is a pointer to Method* 1787 return (jmethodID)cld->jmethod_ids()->add_method(m); 1788 } else { 1789 // At safepoint, we are single threaded and can set this. 1790 if (cld->jmethod_ids() == NULL) { 1791 cld->set_jmethod_ids(new JNIMethodBlock()); 1792 } 1793 // jmethodID is a pointer to Method* 1794 return (jmethodID)cld->jmethod_ids()->add_method(m); 1795 } 1796 } 1797 1798 // Mark a jmethodID as free. This is called when there is a data race in 1799 // InstanceKlass while creating the jmethodID cache. 1800 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 1801 ClassLoaderData* cld = loader_data; 1802 Method** ptr = (Method**)m; 1803 assert(cld->jmethod_ids() != NULL, "should have method handles"); 1804 cld->jmethod_ids()->destroy_method(ptr); 1805 } 1806 1807 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 1808 // Can't assert the method_holder is the same because the new method has the 1809 // scratch method holder. 1810 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 1811 == new_method->method_holder()->class_loader(), 1812 "changing to a different class loader"); 1813 // Just change the method in place, jmethodID pointer doesn't change. 1814 *((Method**)jmid) = new_method; 1815 } 1816 1817 bool Method::is_method_id(jmethodID mid) { 1818 Method* m = resolve_jmethod_id(mid); 1819 assert(m != NULL, "should be called with non-null method"); 1820 InstanceKlass* ik = m->method_holder(); 1821 ClassLoaderData* cld = ik->class_loader_data(); 1822 if (cld->jmethod_ids() == NULL) return false; 1823 return (cld->jmethod_ids()->contains((Method**)mid)); 1824 } 1825 1826 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 1827 if (mid == NULL) return NULL; 1828 Method* o = resolve_jmethod_id(mid); 1829 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 1830 return NULL; 1831 } 1832 return o; 1833 }; 1834 1835 void Method::set_on_stack(const bool value) { 1836 // Set both the method itself and its constant pool. The constant pool 1837 // on stack means some method referring to it is also on the stack. 1838 _access_flags.set_on_stack(value); 1839 constants()->set_on_stack(value); 1840 if (value) MetadataOnStackMark::record(this); 1841 } 1842 1843 // Called when the class loader is unloaded to make all methods weak. 1844 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 1845 loader_data->jmethod_ids()->clear_all_methods(); 1846 } 1847 1848 1849 // Check that this pointer is valid by checking that the vtbl pointer matches 1850 bool Method::is_valid_method() const { 1851 if (this == NULL) { 1852 return false; 1853 } else if (!is_metaspace_object()) { 1854 return false; 1855 } else { 1856 Method m; 1857 // This assumes that the vtbl pointer is the first word of a C++ object. 1858 // This assumption is also in universe.cpp patch_klass_vtble 1859 void* vtbl2 = dereference_vptr((void*)&m); 1860 void* this_vtbl = dereference_vptr((void*)this); 1861 return vtbl2 == this_vtbl; 1862 } 1863 } 1864 1865 #ifndef PRODUCT 1866 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 1867 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 1868 } 1869 #endif // PRODUCT 1870 1871 1872 // Printing 1873 1874 #ifndef PRODUCT 1875 1876 void Method::print_on(outputStream* st) const { 1877 ResourceMark rm; 1878 assert(is_method(), "must be method"); 1879 st->print_cr(internal_name()); 1880 // get the effect of PrintOopAddress, always, for methods: 1881 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this); 1882 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 1883 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants()); 1884 constants()->print_value_on(st); st->cr(); 1885 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 1886 st->print (" - name: "); name()->print_value_on(st); st->cr(); 1887 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 1888 st->print_cr(" - max stack: %d", max_stack()); 1889 st->print_cr(" - max locals: %d", max_locals()); 1890 st->print_cr(" - size of params: %d", size_of_parameters()); 1891 st->print_cr(" - method size: %d", method_size()); 1892 if (intrinsic_id() != vmIntrinsics::_none) 1893 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 1894 if (highest_comp_level() != CompLevel_none) 1895 st->print_cr(" - highest level: %d", highest_comp_level()); 1896 st->print_cr(" - vtable index: %d", _vtable_index); 1897 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry()); 1898 st->print( " - adapters: "); 1899 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 1900 if (a == NULL) 1901 st->print_cr(INTPTR_FORMAT, a); 1902 else 1903 a->print_adapter_on(st); 1904 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry()); 1905 st->print_cr(" - code size: %d", code_size()); 1906 if (code_size() != 0) { 1907 st->print_cr(" - code start: " INTPTR_FORMAT, code_base()); 1908 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size()); 1909 } 1910 if (method_data() != NULL) { 1911 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data()); 1912 } 1913 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 1914 if (checked_exceptions_length() > 0) { 1915 CheckedExceptionElement* table = checked_exceptions_start(); 1916 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table); 1917 if (Verbose) { 1918 for (int i = 0; i < checked_exceptions_length(); i++) { 1919 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 1920 } 1921 } 1922 } 1923 if (has_linenumber_table()) { 1924 u_char* table = compressed_linenumber_table(); 1925 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table); 1926 if (Verbose) { 1927 CompressedLineNumberReadStream stream(table); 1928 while (stream.read_pair()) { 1929 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 1930 } 1931 } 1932 } 1933 st->print_cr(" - localvar length: %d", localvariable_table_length()); 1934 if (localvariable_table_length() > 0) { 1935 LocalVariableTableElement* table = localvariable_table_start(); 1936 st->print_cr(" - localvar start: " INTPTR_FORMAT, table); 1937 if (Verbose) { 1938 for (int i = 0; i < localvariable_table_length(); i++) { 1939 int bci = table[i].start_bci; 1940 int len = table[i].length; 1941 const char* name = constants()->printable_name_at(table[i].name_cp_index); 1942 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 1943 int slot = table[i].slot; 1944 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 1945 } 1946 } 1947 } 1948 if (code() != NULL) { 1949 st->print (" - compiled code: "); 1950 code()->print_value_on(st); 1951 } 1952 if (is_native()) { 1953 st->print_cr(" - native function: " INTPTR_FORMAT, native_function()); 1954 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler()); 1955 } 1956 } 1957 1958 #endif //PRODUCT 1959 1960 void Method::print_value_on(outputStream* st) const { 1961 assert(is_method(), "must be method"); 1962 st->print_cr(internal_name()); 1963 print_address_on(st); 1964 st->print(" "); 1965 name()->print_value_on(st); 1966 st->print(" "); 1967 signature()->print_value_on(st); 1968 st->print(" in "); 1969 method_holder()->print_value_on(st); 1970 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 1971 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 1972 } 1973 1974 #if INCLUDE_SERVICES 1975 // Size Statistics 1976 void Method::collect_statistics(KlassSizeStats *sz) const { 1977 int mysize = sz->count(this); 1978 sz->_method_bytes += mysize; 1979 sz->_method_all_bytes += mysize; 1980 sz->_rw_bytes += mysize; 1981 1982 if (constMethod()) { 1983 constMethod()->collect_statistics(sz); 1984 } 1985 if (method_data()) { 1986 method_data()->collect_statistics(sz); 1987 } 1988 } 1989 #endif // INCLUDE_SERVICES 1990 1991 // Verification 1992 1993 void Method::verify_on(outputStream* st) { 1994 guarantee(is_method(), "object must be method"); 1995 guarantee(constants()->is_constantPool(), "should be constant pool"); 1996 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 1997 MethodData* md = method_data(); 1998 guarantee(md == NULL || 1999 md->is_methodData(), "should be method data"); 2000 }