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_not_compilable(int comp_level) const { 724 if (number_of_breakpoints() > 0) 725 return true; 726 if (is_method_handle_intrinsic()) 727 return !is_synthetic(); // the generated adapters must be compiled 728 if (comp_level == CompLevel_any) 729 return is_not_c1_compilable() || is_not_c2_compilable(); 730 if (is_c1_compile(comp_level)) 731 return is_not_c1_compilable(); 732 if (is_c2_compile(comp_level)) 733 return is_not_c2_compilable(); 734 return false; 735 } 736 737 // call this when compiler finds that this method is not compilable 738 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 739 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 740 if (comp_level == CompLevel_all) { 741 set_not_c1_compilable(); 742 set_not_c2_compilable(); 743 } else { 744 if (is_c1_compile(comp_level)) 745 set_not_c1_compilable(); 746 if (is_c2_compile(comp_level)) 747 set_not_c2_compilable(); 748 } 749 CompilationPolicy::policy()->disable_compilation(this); 750 } 751 752 bool Method::is_not_osr_compilable(int comp_level) const { 753 if (is_not_compilable(comp_level)) 754 return true; 755 if (comp_level == CompLevel_any) 756 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 757 if (is_c1_compile(comp_level)) 758 return is_not_c1_osr_compilable(); 759 if (is_c2_compile(comp_level)) 760 return is_not_c2_osr_compilable(); 761 return false; 762 } 763 764 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 765 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 766 if (comp_level == CompLevel_all) { 767 set_not_c1_osr_compilable(); 768 set_not_c2_osr_compilable(); 769 } else { 770 if (is_c1_compile(comp_level)) 771 set_not_c1_osr_compilable(); 772 if (is_c2_compile(comp_level)) 773 set_not_c2_osr_compilable(); 774 } 775 CompilationPolicy::policy()->disable_compilation(this); 776 } 777 778 // Revert to using the interpreter and clear out the nmethod 779 void Method::clear_code() { 780 781 // this may be NULL if c2i adapters have not been made yet 782 // Only should happen at allocate time. 783 if (_adapter == NULL) { 784 _from_compiled_entry = NULL; 785 } else { 786 _from_compiled_entry = _adapter->get_c2i_entry(); 787 } 788 OrderAccess::storestore(); 789 _from_interpreted_entry = _i2i_entry; 790 OrderAccess::storestore(); 791 _code = NULL; 792 } 793 794 // Called by class data sharing to remove any entry points (which are not shared) 795 void Method::unlink_method() { 796 _code = NULL; 797 _i2i_entry = NULL; 798 _from_interpreted_entry = NULL; 799 if (is_native()) { 800 *native_function_addr() = NULL; 801 set_signature_handler(NULL); 802 } 803 NOT_PRODUCT(set_compiled_invocation_count(0);) 804 _adapter = NULL; 805 _from_compiled_entry = NULL; 806 807 // In case of DumpSharedSpaces, _method_data should always be NULL. 808 // 809 // During runtime (!DumpSharedSpaces), when we are cleaning a 810 // shared class that failed to load, this->link_method() may 811 // have already been called (before an exception happened), so 812 // this->_method_data may not be NULL. 813 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?"); 814 815 set_method_data(NULL); 816 set_method_counters(NULL); 817 } 818 819 // Called when the method_holder is getting linked. Setup entrypoints so the method 820 // is ready to be called from interpreter, compiler, and vtables. 821 void Method::link_method(methodHandle h_method, TRAPS) { 822 // If the code cache is full, we may reenter this function for the 823 // leftover methods that weren't linked. 824 if (_i2i_entry != NULL) return; 825 826 assert(_adapter == NULL, "init'd to NULL" ); 827 assert( _code == NULL, "nothing compiled yet" ); 828 829 // Setup interpreter entrypoint 830 assert(this == h_method(), "wrong h_method()" ); 831 address entry = Interpreter::entry_for_method(h_method); 832 assert(entry != NULL, "interpreter entry must be non-null"); 833 // Sets both _i2i_entry and _from_interpreted_entry 834 set_interpreter_entry(entry); 835 836 // Don't overwrite already registered native entries. 837 if (is_native() && !has_native_function()) { 838 set_native_function( 839 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 840 !native_bind_event_is_interesting); 841 } 842 843 // Setup compiler entrypoint. This is made eagerly, so we do not need 844 // special handling of vtables. An alternative is to make adapters more 845 // lazily by calling make_adapter() from from_compiled_entry() for the 846 // normal calls. For vtable calls life gets more complicated. When a 847 // call-site goes mega-morphic we need adapters in all methods which can be 848 // called from the vtable. We need adapters on such methods that get loaded 849 // later. Ditto for mega-morphic itable calls. If this proves to be a 850 // problem we'll make these lazily later. 851 (void) make_adapters(h_method, CHECK); 852 853 // ONLY USE the h_method now as make_adapter may have blocked 854 855 } 856 857 address Method::make_adapters(methodHandle mh, TRAPS) { 858 // Adapters for compiled code are made eagerly here. They are fairly 859 // small (generally < 100 bytes) and quick to make (and cached and shared) 860 // so making them eagerly shouldn't be too expensive. 861 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 862 if (adapter == NULL ) { 863 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); 864 } 865 866 mh->set_adapter_entry(adapter); 867 mh->_from_compiled_entry = adapter->get_c2i_entry(); 868 return adapter->get_c2i_entry(); 869 } 870 871 // The verified_code_entry() must be called when a invoke is resolved 872 // on this method. 873 874 // It returns the compiled code entry point, after asserting not null. 875 // This function is called after potential safepoints so that nmethod 876 // or adapter that it points to is still live and valid. 877 // This function must not hit a safepoint! 878 address Method::verified_code_entry() { 879 debug_only(No_Safepoint_Verifier nsv;) 880 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 881 if (code == NULL && UseCodeCacheFlushing) { 882 nmethod *saved_code = CodeCache::reanimate_saved_code(this); 883 if (saved_code != NULL) { 884 methodHandle method(this); 885 assert( ! saved_code->is_osr_method(), "should not get here for osr" ); 886 set_code( method, saved_code ); 887 } 888 } 889 890 assert(_from_compiled_entry != NULL, "must be set"); 891 return _from_compiled_entry; 892 } 893 894 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 895 // (could be racing a deopt). 896 // Not inline to avoid circular ref. 897 bool Method::check_code() const { 898 // cached in a register or local. There's a race on the value of the field. 899 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 900 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 901 } 902 903 // Install compiled code. Instantly it can execute. 904 void Method::set_code(methodHandle mh, nmethod *code) { 905 assert( code, "use clear_code to remove code" ); 906 assert( mh->check_code(), "" ); 907 908 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 909 910 // These writes must happen in this order, because the interpreter will 911 // directly jump to from_interpreted_entry which jumps to an i2c adapter 912 // which jumps to _from_compiled_entry. 913 mh->_code = code; // Assign before allowing compiled code to exec 914 915 int comp_level = code->comp_level(); 916 // In theory there could be a race here. In practice it is unlikely 917 // and not worth worrying about. 918 if (comp_level > mh->highest_comp_level()) { 919 mh->set_highest_comp_level(comp_level); 920 } 921 922 OrderAccess::storestore(); 923 #ifdef SHARK 924 mh->_from_interpreted_entry = code->insts_begin(); 925 #else //!SHARK 926 mh->_from_compiled_entry = code->verified_entry_point(); 927 OrderAccess::storestore(); 928 // Instantly compiled code can execute. 929 if (!mh->is_method_handle_intrinsic()) 930 mh->_from_interpreted_entry = mh->get_i2c_entry(); 931 #endif //!SHARK 932 } 933 934 935 bool Method::is_overridden_in(Klass* k) const { 936 InstanceKlass* ik = InstanceKlass::cast(k); 937 938 if (ik->is_interface()) return false; 939 940 // If method is an interface, we skip it - except if it 941 // is a miranda method 942 if (method_holder()->is_interface()) { 943 // Check that method is not a miranda method 944 if (ik->lookup_method(name(), signature()) == NULL) { 945 // No implementation exist - so miranda method 946 return false; 947 } 948 return true; 949 } 950 951 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 952 assert(ik->vtable() != NULL, "vtable should exist"); 953 if (vtable_index() == nonvirtual_vtable_index) { 954 return false; 955 } else { 956 Method* vt_m = ik->method_at_vtable(vtable_index()); 957 return vt_m != this; 958 } 959 } 960 961 962 // give advice about whether this Method* should be cached or not 963 bool Method::should_not_be_cached() const { 964 if (is_old()) { 965 // This method has been redefined. It is either EMCP or obsolete 966 // and we don't want to cache it because that would pin the method 967 // down and prevent it from being collectible if and when it 968 // finishes executing. 969 return true; 970 } 971 972 // caching this method should be just fine 973 return false; 974 } 975 976 977 /** 978 * Returns true if this is one of the specially treated methods for 979 * security related stack walks (like Reflection.getCallerClass). 980 */ 981 bool Method::is_ignored_by_security_stack_walk() const { 982 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection; 983 984 assert(intrinsic_id() != vmIntrinsics::_invoke || Universe::reflect_invoke_cache()->is_same_method((Method*)this), "sanity"); 985 if (intrinsic_id() == vmIntrinsics::_invoke) { 986 // This is Method.invoke() -- ignore it 987 return true; 988 } 989 if (use_new_reflection && 990 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 991 // This is an auxilary frame -- ignore it 992 return true; 993 } 994 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 995 // This is an internal adapter frame for method handles -- ignore it 996 return true; 997 } 998 return false; 999 } 1000 1001 1002 // Constant pool structure for invoke methods: 1003 enum { 1004 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1005 _imcp_invoke_signature, // utf8: (variable Symbol*) 1006 _imcp_limit 1007 }; 1008 1009 // Test if this method is an MH adapter frame generated by Java code. 1010 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1011 bool Method::is_compiled_lambda_form() const { 1012 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1013 } 1014 1015 // Test if this method is an internal MH primitive method. 1016 bool Method::is_method_handle_intrinsic() const { 1017 vmIntrinsics::ID iid = intrinsic_id(); 1018 return (MethodHandles::is_signature_polymorphic(iid) && 1019 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1020 } 1021 1022 bool Method::has_member_arg() const { 1023 vmIntrinsics::ID iid = intrinsic_id(); 1024 return (MethodHandles::is_signature_polymorphic(iid) && 1025 MethodHandles::has_member_arg(iid)); 1026 } 1027 1028 // Make an instance of a signature-polymorphic internal MH primitive. 1029 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1030 Symbol* signature, 1031 TRAPS) { 1032 ResourceMark rm; 1033 methodHandle empty; 1034 1035 KlassHandle holder = SystemDictionary::MethodHandle_klass(); 1036 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1037 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1038 if (TraceMethodHandles) { 1039 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1040 } 1041 1042 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1043 name->increment_refcount(); 1044 signature->increment_refcount(); 1045 1046 int cp_length = _imcp_limit; 1047 ClassLoaderData* loader_data = holder->class_loader_data(); 1048 constantPoolHandle cp; 1049 { 1050 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1051 cp = constantPoolHandle(THREAD, cp_oop); 1052 } 1053 cp->set_pool_holder(InstanceKlass::cast(holder())); 1054 cp->symbol_at_put(_imcp_invoke_name, name); 1055 cp->symbol_at_put(_imcp_invoke_signature, signature); 1056 cp->set_has_preresolution(); 1057 1058 // decide on access bits: public or not? 1059 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1060 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1061 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1062 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1063 1064 methodHandle m; 1065 { 1066 InlineTableSizes sizes; 1067 Method* m_oop = Method::allocate(loader_data, 0, 1068 accessFlags_from(flags_bits), &sizes, 1069 ConstMethod::NORMAL, CHECK_(empty)); 1070 m = methodHandle(THREAD, m_oop); 1071 } 1072 m->set_constants(cp()); 1073 m->set_name_index(_imcp_invoke_name); 1074 m->set_signature_index(_imcp_invoke_signature); 1075 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1076 assert(m->signature() == signature, ""); 1077 #ifdef CC_INTERP 1078 ResultTypeFinder rtf(signature); 1079 m->set_result_index(rtf.type()); 1080 #endif 1081 m->compute_size_of_parameters(THREAD); 1082 m->init_intrinsic_id(); 1083 assert(m->is_method_handle_intrinsic(), ""); 1084 #ifdef ASSERT 1085 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1086 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1087 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1088 #endif //ASSERT 1089 1090 // Finally, set up its entry points. 1091 assert(m->can_be_statically_bound(), ""); 1092 m->set_vtable_index(Method::nonvirtual_vtable_index); 1093 m->link_method(m, CHECK_(empty)); 1094 1095 if (TraceMethodHandles && (Verbose || WizardMode)) 1096 m->print_on(tty); 1097 1098 return m; 1099 } 1100 1101 Klass* Method::check_non_bcp_klass(Klass* klass) { 1102 if (klass != NULL && klass->class_loader() != NULL) { 1103 if (klass->oop_is_objArray()) 1104 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1105 return klass; 1106 } 1107 return NULL; 1108 } 1109 1110 1111 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1112 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1113 // Code below does not work for native methods - they should never get rewritten anyway 1114 assert(!m->is_native(), "cannot rewrite native methods"); 1115 // Allocate new Method* 1116 AccessFlags flags = m->access_flags(); 1117 1118 ConstMethod* cm = m->constMethod(); 1119 int checked_exceptions_len = cm->checked_exceptions_length(); 1120 int localvariable_len = cm->localvariable_table_length(); 1121 int exception_table_len = cm->exception_table_length(); 1122 int method_parameters_len = cm->method_parameters_length(); 1123 int method_annotations_len = cm->method_annotations_length(); 1124 int parameter_annotations_len = cm->parameter_annotations_length(); 1125 int type_annotations_len = cm->type_annotations_length(); 1126 int default_annotations_len = cm->default_annotations_length(); 1127 1128 InlineTableSizes sizes( 1129 localvariable_len, 1130 new_compressed_linenumber_size, 1131 exception_table_len, 1132 checked_exceptions_len, 1133 method_parameters_len, 1134 cm->generic_signature_index(), 1135 method_annotations_len, 1136 parameter_annotations_len, 1137 type_annotations_len, 1138 default_annotations_len, 1139 0); 1140 1141 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1142 Method* newm_oop = Method::allocate(loader_data, 1143 new_code_length, 1144 flags, 1145 &sizes, 1146 m->method_type(), 1147 CHECK_(methodHandle())); 1148 methodHandle newm (THREAD, newm_oop); 1149 int new_method_size = newm->method_size(); 1150 1151 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1152 ConstMethod* newcm = newm->constMethod(); 1153 int new_const_method_size = newm->constMethod()->size(); 1154 1155 memcpy(newm(), m(), sizeof(Method)); 1156 1157 // Create shallow copy of ConstMethod. 1158 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1159 1160 // Reset correct method/const method, method size, and parameter info 1161 newm->set_constMethod(newcm); 1162 newm->constMethod()->set_code_size(new_code_length); 1163 newm->constMethod()->set_constMethod_size(new_const_method_size); 1164 newm->set_method_size(new_method_size); 1165 assert(newm->code_size() == new_code_length, "check"); 1166 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1167 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1168 assert(newm->exception_table_length() == exception_table_len, "check"); 1169 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1170 // Copy new byte codes 1171 memcpy(newm->code_base(), new_code, new_code_length); 1172 // Copy line number table 1173 if (new_compressed_linenumber_size > 0) { 1174 memcpy(newm->compressed_linenumber_table(), 1175 new_compressed_linenumber_table, 1176 new_compressed_linenumber_size); 1177 } 1178 // Copy method_parameters 1179 if (method_parameters_len > 0) { 1180 memcpy(newm->method_parameters_start(), 1181 m->method_parameters_start(), 1182 method_parameters_len * sizeof(MethodParametersElement)); 1183 } 1184 // Copy checked_exceptions 1185 if (checked_exceptions_len > 0) { 1186 memcpy(newm->checked_exceptions_start(), 1187 m->checked_exceptions_start(), 1188 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1189 } 1190 // Copy exception table 1191 if (exception_table_len > 0) { 1192 memcpy(newm->exception_table_start(), 1193 m->exception_table_start(), 1194 exception_table_len * sizeof(ExceptionTableElement)); 1195 } 1196 // Copy local variable number table 1197 if (localvariable_len > 0) { 1198 memcpy(newm->localvariable_table_start(), 1199 m->localvariable_table_start(), 1200 localvariable_len * sizeof(LocalVariableTableElement)); 1201 } 1202 // Copy stackmap table 1203 if (m->has_stackmap_table()) { 1204 int code_attribute_length = m->stackmap_data()->length(); 1205 Array<u1>* stackmap_data = 1206 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1207 memcpy((void*)stackmap_data->adr_at(0), 1208 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1209 newm->set_stackmap_data(stackmap_data); 1210 } 1211 1212 // copy annotations over to new method 1213 newcm->copy_annotations_from(cm); 1214 return newm; 1215 } 1216 1217 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) { 1218 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1219 // because we are not loading from core libraries 1220 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1221 // which does not use the class default class loader so we check for its loader here 1222 InstanceKlass* ik = InstanceKlass::cast(holder); 1223 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) { 1224 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1225 } 1226 1227 // see if the klass name is well-known: 1228 Symbol* klass_name = ik->name(); 1229 return vmSymbols::find_sid(klass_name); 1230 } 1231 1232 void Method::init_intrinsic_id() { 1233 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1234 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1235 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1236 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1237 1238 // the klass name is well-known: 1239 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1240 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1241 1242 // ditto for method and signature: 1243 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1244 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1245 && name_id == vmSymbols::NO_SID) 1246 return; 1247 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1248 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1249 && sig_id == vmSymbols::NO_SID) return; 1250 jshort flags = access_flags().as_short(); 1251 1252 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1253 if (id != vmIntrinsics::_none) { 1254 set_intrinsic_id(id); 1255 return; 1256 } 1257 1258 // A few slightly irregular cases: 1259 switch (klass_id) { 1260 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1261 // Second chance: check in regular Math. 1262 switch (name_id) { 1263 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1264 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1265 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1266 // pretend it is the corresponding method in the non-strict class: 1267 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1268 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1269 break; 1270 } 1271 break; 1272 1273 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. 1274 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1275 if (!is_native()) break; 1276 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1277 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1278 id = vmIntrinsics::_none; 1279 break; 1280 } 1281 1282 if (id != vmIntrinsics::_none) { 1283 // Set up its iid. It is an alias method. 1284 set_intrinsic_id(id); 1285 return; 1286 } 1287 } 1288 1289 // These two methods are static since a GC may move the Method 1290 bool Method::load_signature_classes(methodHandle m, TRAPS) { 1291 if (THREAD->is_Compiler_thread()) { 1292 // There is nothing useful this routine can do from within the Compile thread. 1293 // Hopefully, the signature contains only well-known classes. 1294 // We could scan for this and return true/false, but the caller won't care. 1295 return false; 1296 } 1297 bool sig_is_loaded = true; 1298 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1299 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1300 ResourceMark rm(THREAD); 1301 Symbol* signature = m->signature(); 1302 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1303 if (ss.is_object()) { 1304 Symbol* sym = ss.as_symbol(CHECK_(false)); 1305 Symbol* name = sym; 1306 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1307 protection_domain, THREAD); 1308 // We are loading classes eagerly. If a ClassNotFoundException or 1309 // a LinkageError was generated, be sure to ignore it. 1310 if (HAS_PENDING_EXCEPTION) { 1311 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1312 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1313 CLEAR_PENDING_EXCEPTION; 1314 } else { 1315 return false; 1316 } 1317 } 1318 if( klass == NULL) { sig_is_loaded = false; } 1319 } 1320 } 1321 return sig_is_loaded; 1322 } 1323 1324 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1325 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1326 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1327 ResourceMark rm(THREAD); 1328 Symbol* signature = m->signature(); 1329 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1330 if (ss.type() == T_OBJECT) { 1331 Symbol* name = ss.as_symbol_or_null(); 1332 if (name == NULL) return true; 1333 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1334 if (klass == NULL) return true; 1335 } 1336 } 1337 return false; 1338 } 1339 1340 // Exposed so field engineers can debug VM 1341 void Method::print_short_name(outputStream* st) { 1342 ResourceMark rm; 1343 #ifdef PRODUCT 1344 st->print(" %s::", method_holder()->external_name()); 1345 #else 1346 st->print(" %s::", method_holder()->internal_name()); 1347 #endif 1348 name()->print_symbol_on(st); 1349 if (WizardMode) signature()->print_symbol_on(st); 1350 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1351 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1352 } 1353 1354 // Comparer for sorting an object array containing 1355 // Method*s. 1356 static int method_comparator(Method* a, Method* b) { 1357 return a->name()->fast_compare(b->name()); 1358 } 1359 1360 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1361 void Method::sort_methods(Array<Method*>* methods, bool idempotent) { 1362 int length = methods->length(); 1363 if (length > 1) { 1364 { 1365 No_Safepoint_Verifier nsv; 1366 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); 1367 } 1368 // Reset method ordering 1369 for (int i = 0; i < length; i++) { 1370 Method* m = methods->at(i); 1371 m->set_method_idnum(i); 1372 } 1373 } 1374 } 1375 1376 1377 //----------------------------------------------------------------------------------- 1378 // Non-product code unless JVM/TI needs it 1379 1380 #if !defined(PRODUCT) || INCLUDE_JVMTI 1381 class SignatureTypePrinter : public SignatureTypeNames { 1382 private: 1383 outputStream* _st; 1384 bool _use_separator; 1385 1386 void type_name(const char* name) { 1387 if (_use_separator) _st->print(", "); 1388 _st->print(name); 1389 _use_separator = true; 1390 } 1391 1392 public: 1393 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1394 _st = st; 1395 _use_separator = false; 1396 } 1397 1398 void print_parameters() { _use_separator = false; iterate_parameters(); } 1399 void print_returntype() { _use_separator = false; iterate_returntype(); } 1400 }; 1401 1402 1403 void Method::print_name(outputStream* st) { 1404 Thread *thread = Thread::current(); 1405 ResourceMark rm(thread); 1406 SignatureTypePrinter sig(signature(), st); 1407 st->print("%s ", is_static() ? "static" : "virtual"); 1408 sig.print_returntype(); 1409 st->print(" %s.", method_holder()->internal_name()); 1410 name()->print_symbol_on(st); 1411 st->print("("); 1412 sig.print_parameters(); 1413 st->print(")"); 1414 } 1415 #endif // !PRODUCT || INCLUDE_JVMTI 1416 1417 1418 //----------------------------------------------------------------------------------- 1419 // Non-product code 1420 1421 #ifndef PRODUCT 1422 void Method::print_codes_on(outputStream* st) const { 1423 print_codes_on(0, code_size(), st); 1424 } 1425 1426 void Method::print_codes_on(int from, int to, outputStream* st) const { 1427 Thread *thread = Thread::current(); 1428 ResourceMark rm(thread); 1429 methodHandle mh (thread, (Method*)this); 1430 BytecodeStream s(mh); 1431 s.set_interval(from, to); 1432 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1433 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1434 } 1435 #endif // not PRODUCT 1436 1437 1438 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1439 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1440 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1441 // as end-of-stream terminator. 1442 1443 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1444 // bci and line number does not compress into single byte. 1445 // Write out escape character and use regular compression for bci and line number. 1446 write_byte((jubyte)0xFF); 1447 write_signed_int(bci_delta); 1448 write_signed_int(line_delta); 1449 } 1450 1451 // See comment in method.hpp which explains why this exists. 1452 #if defined(_M_AMD64) && _MSC_VER >= 1400 1453 #pragma optimize("", off) 1454 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1455 write_pair_inline(bci, line); 1456 } 1457 #pragma optimize("", on) 1458 #endif 1459 1460 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1461 _bci = 0; 1462 _line = 0; 1463 }; 1464 1465 1466 bool CompressedLineNumberReadStream::read_pair() { 1467 jubyte next = read_byte(); 1468 // Check for terminator 1469 if (next == 0) return false; 1470 if (next == 0xFF) { 1471 // Escape character, regular compression used 1472 _bci += read_signed_int(); 1473 _line += read_signed_int(); 1474 } else { 1475 // Single byte compression used 1476 _bci += next >> 3; 1477 _line += next & 0x7; 1478 } 1479 return true; 1480 } 1481 1482 1483 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1484 BreakpointInfo* bp = method_holder()->breakpoints(); 1485 for (; bp != NULL; bp = bp->next()) { 1486 if (bp->match(this, bci)) { 1487 return bp->orig_bytecode(); 1488 } 1489 } 1490 ShouldNotReachHere(); 1491 return Bytecodes::_shouldnotreachhere; 1492 } 1493 1494 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1495 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1496 BreakpointInfo* bp = method_holder()->breakpoints(); 1497 for (; bp != NULL; bp = bp->next()) { 1498 if (bp->match(this, bci)) { 1499 bp->set_orig_bytecode(code); 1500 // and continue, in case there is more than one 1501 } 1502 } 1503 } 1504 1505 void Method::set_breakpoint(int bci) { 1506 InstanceKlass* ik = method_holder(); 1507 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1508 bp->set_next(ik->breakpoints()); 1509 ik->set_breakpoints(bp); 1510 // do this last: 1511 bp->set(this); 1512 } 1513 1514 static void clear_matches(Method* m, int bci) { 1515 InstanceKlass* ik = m->method_holder(); 1516 BreakpointInfo* prev_bp = NULL; 1517 BreakpointInfo* next_bp; 1518 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1519 next_bp = bp->next(); 1520 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1521 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1522 // do this first: 1523 bp->clear(m); 1524 // unhook it 1525 if (prev_bp != NULL) 1526 prev_bp->set_next(next_bp); 1527 else 1528 ik->set_breakpoints(next_bp); 1529 delete bp; 1530 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1531 // at same location. So we have multiple matching (method_index and bci) 1532 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1533 // breakpoint for clear_breakpoint request and keep all other method versions 1534 // BreakpointInfo for future clear_breakpoint request. 1535 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1536 // which is being called when class is unloaded. We delete all the Breakpoint 1537 // information for all versions of method. We may not correctly restore the original 1538 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1539 // so these methods won't be used anymore. 1540 if (bci >= 0) { 1541 break; 1542 } 1543 } else { 1544 // This one is a keeper. 1545 prev_bp = bp; 1546 } 1547 } 1548 } 1549 1550 void Method::clear_breakpoint(int bci) { 1551 assert(bci >= 0, ""); 1552 clear_matches(this, bci); 1553 } 1554 1555 void Method::clear_all_breakpoints() { 1556 clear_matches(this, -1); 1557 } 1558 1559 1560 int Method::invocation_count() { 1561 MethodCounters *mcs = method_counters(); 1562 if (TieredCompilation) { 1563 MethodData* const mdo = method_data(); 1564 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1565 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1566 return InvocationCounter::count_limit; 1567 } else { 1568 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1569 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1570 } 1571 } else { 1572 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1573 } 1574 } 1575 1576 int Method::backedge_count() { 1577 MethodCounters *mcs = method_counters(); 1578 if (TieredCompilation) { 1579 MethodData* const mdo = method_data(); 1580 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1581 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1582 return InvocationCounter::count_limit; 1583 } else { 1584 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1585 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1586 } 1587 } else { 1588 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1589 } 1590 } 1591 1592 int Method::highest_comp_level() const { 1593 const MethodData* mdo = method_data(); 1594 if (mdo != NULL) { 1595 return mdo->highest_comp_level(); 1596 } else { 1597 return CompLevel_none; 1598 } 1599 } 1600 1601 int Method::highest_osr_comp_level() const { 1602 const MethodData* mdo = method_data(); 1603 if (mdo != NULL) { 1604 return mdo->highest_osr_comp_level(); 1605 } else { 1606 return CompLevel_none; 1607 } 1608 } 1609 1610 void Method::set_highest_comp_level(int level) { 1611 MethodData* mdo = method_data(); 1612 if (mdo != NULL) { 1613 mdo->set_highest_comp_level(level); 1614 } 1615 } 1616 1617 void Method::set_highest_osr_comp_level(int level) { 1618 MethodData* mdo = method_data(); 1619 if (mdo != NULL) { 1620 mdo->set_highest_osr_comp_level(level); 1621 } 1622 } 1623 1624 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1625 _bci = bci; 1626 _name_index = m->name_index(); 1627 _signature_index = m->signature_index(); 1628 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1629 if (_orig_bytecode == Bytecodes::_breakpoint) 1630 _orig_bytecode = m->orig_bytecode_at(_bci); 1631 _next = NULL; 1632 } 1633 1634 void BreakpointInfo::set(Method* method) { 1635 #ifdef ASSERT 1636 { 1637 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1638 if (code == Bytecodes::_breakpoint) 1639 code = method->orig_bytecode_at(_bci); 1640 assert(orig_bytecode() == code, "original bytecode must be the same"); 1641 } 1642 #endif 1643 Thread *thread = Thread::current(); 1644 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1645 method->incr_number_of_breakpoints(thread); 1646 SystemDictionary::notice_modification(); 1647 { 1648 // Deoptimize all dependents on this method 1649 HandleMark hm(thread); 1650 methodHandle mh(thread, method); 1651 Universe::flush_dependents_on_method(mh); 1652 } 1653 } 1654 1655 void BreakpointInfo::clear(Method* method) { 1656 *method->bcp_from(_bci) = orig_bytecode(); 1657 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1658 method->decr_number_of_breakpoints(Thread::current()); 1659 } 1660 1661 // jmethodID handling 1662 1663 // This is a block allocating object, sort of like JNIHandleBlock, only a 1664 // lot simpler. There aren't many of these, they aren't long, they are rarely 1665 // deleted and so we can do some suboptimal things. 1666 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1667 // never get rid of it. 1668 // It would be nice to be able to parameterize the number of methods for 1669 // the null_class_loader but then we'd have to turn this and ClassLoaderData 1670 // into templates. 1671 1672 // I feel like this brain dead class should exist somewhere in the STL 1673 1674 class JNIMethodBlock : public CHeapObj<mtClass> { 1675 enum { number_of_methods = 8 }; 1676 1677 Method* _methods[number_of_methods]; 1678 int _top; 1679 JNIMethodBlock* _next; 1680 public: 1681 static Method* const _free_method; 1682 1683 JNIMethodBlock() : _next(NULL), _top(0) { 1684 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method; 1685 } 1686 1687 Method** add_method(Method* m) { 1688 if (_top < number_of_methods) { 1689 // top points to the next free entry. 1690 int i = _top; 1691 _methods[i] = m; 1692 _top++; 1693 return &_methods[i]; 1694 } else if (_top == number_of_methods) { 1695 // if the next free entry ran off the block see if there's a free entry 1696 for (int i = 0; i< number_of_methods; i++) { 1697 if (_methods[i] == _free_method) { 1698 _methods[i] = m; 1699 return &_methods[i]; 1700 } 1701 } 1702 // Only check each block once for frees. They're very unlikely. 1703 // Increment top past the end of the block. 1704 _top++; 1705 } 1706 // need to allocate a next block. 1707 if (_next == NULL) { 1708 _next = new JNIMethodBlock(); 1709 } 1710 return _next->add_method(m); 1711 } 1712 1713 bool contains(Method** m) { 1714 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1715 for (int i = 0; i< number_of_methods; i++) { 1716 if (&(b->_methods[i]) == m) { 1717 return true; 1718 } 1719 } 1720 } 1721 return false; // not found 1722 } 1723 1724 // Doesn't really destroy it, just marks it as free so it can be reused. 1725 void destroy_method(Method** m) { 1726 #ifdef ASSERT 1727 assert(contains(m), "should be a methodID"); 1728 #endif // ASSERT 1729 *m = _free_method; 1730 } 1731 1732 // During class unloading the methods are cleared, which is different 1733 // than freed. 1734 void clear_all_methods() { 1735 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1736 for (int i = 0; i< number_of_methods; i++) { 1737 _methods[i] = NULL; 1738 } 1739 } 1740 } 1741 #ifndef PRODUCT 1742 int count_methods() { 1743 // count all allocated methods 1744 int count = 0; 1745 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1746 for (int i = 0; i< number_of_methods; i++) { 1747 if (_methods[i] != _free_method) count++; 1748 } 1749 } 1750 return count; 1751 } 1752 #endif // PRODUCT 1753 }; 1754 1755 // Something that can't be mistaken for an address or a markOop 1756 Method* const JNIMethodBlock::_free_method = (Method*)55; 1757 1758 // Add a method id to the jmethod_ids 1759 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 1760 ClassLoaderData* cld = loader_data; 1761 1762 if (!SafepointSynchronize::is_at_safepoint()) { 1763 // Have to add jmethod_ids() to class loader data thread-safely. 1764 // Also have to add the method to the list safely, which the cld lock 1765 // protects as well. 1766 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 1767 if (cld->jmethod_ids() == NULL) { 1768 cld->set_jmethod_ids(new JNIMethodBlock()); 1769 } 1770 // jmethodID is a pointer to Method* 1771 return (jmethodID)cld->jmethod_ids()->add_method(m); 1772 } else { 1773 // At safepoint, we are single threaded and can set this. 1774 if (cld->jmethod_ids() == NULL) { 1775 cld->set_jmethod_ids(new JNIMethodBlock()); 1776 } 1777 // jmethodID is a pointer to Method* 1778 return (jmethodID)cld->jmethod_ids()->add_method(m); 1779 } 1780 } 1781 1782 // Mark a jmethodID as free. This is called when there is a data race in 1783 // InstanceKlass while creating the jmethodID cache. 1784 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 1785 ClassLoaderData* cld = loader_data; 1786 Method** ptr = (Method**)m; 1787 assert(cld->jmethod_ids() != NULL, "should have method handles"); 1788 cld->jmethod_ids()->destroy_method(ptr); 1789 } 1790 1791 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 1792 // Can't assert the method_holder is the same because the new method has the 1793 // scratch method holder. 1794 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 1795 == new_method->method_holder()->class_loader(), 1796 "changing to a different class loader"); 1797 // Just change the method in place, jmethodID pointer doesn't change. 1798 *((Method**)jmid) = new_method; 1799 } 1800 1801 bool Method::is_method_id(jmethodID mid) { 1802 Method* m = resolve_jmethod_id(mid); 1803 assert(m != NULL, "should be called with non-null method"); 1804 InstanceKlass* ik = m->method_holder(); 1805 ClassLoaderData* cld = ik->class_loader_data(); 1806 if (cld->jmethod_ids() == NULL) return false; 1807 return (cld->jmethod_ids()->contains((Method**)mid)); 1808 } 1809 1810 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 1811 if (mid == NULL) return NULL; 1812 Method* o = resolve_jmethod_id(mid); 1813 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 1814 return NULL; 1815 } 1816 return o; 1817 }; 1818 1819 void Method::set_on_stack(const bool value) { 1820 // Set both the method itself and its constant pool. The constant pool 1821 // on stack means some method referring to it is also on the stack. 1822 _access_flags.set_on_stack(value); 1823 constants()->set_on_stack(value); 1824 if (value) MetadataOnStackMark::record(this); 1825 } 1826 1827 // Called when the class loader is unloaded to make all methods weak. 1828 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 1829 loader_data->jmethod_ids()->clear_all_methods(); 1830 } 1831 1832 1833 // Check that this pointer is valid by checking that the vtbl pointer matches 1834 bool Method::is_valid_method() const { 1835 if (this == NULL) { 1836 return false; 1837 } else if (!is_metaspace_object()) { 1838 return false; 1839 } else { 1840 Method m; 1841 // This assumes that the vtbl pointer is the first word of a C++ object. 1842 // This assumption is also in universe.cpp patch_klass_vtble 1843 void* vtbl2 = dereference_vptr((void*)&m); 1844 void* this_vtbl = dereference_vptr((void*)this); 1845 return vtbl2 == this_vtbl; 1846 } 1847 } 1848 1849 #ifndef PRODUCT 1850 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 1851 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 1852 } 1853 #endif // PRODUCT 1854 1855 1856 // Printing 1857 1858 #ifndef PRODUCT 1859 1860 void Method::print_on(outputStream* st) const { 1861 ResourceMark rm; 1862 assert(is_method(), "must be method"); 1863 st->print_cr(internal_name()); 1864 // get the effect of PrintOopAddress, always, for methods: 1865 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this); 1866 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 1867 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants()); 1868 constants()->print_value_on(st); st->cr(); 1869 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 1870 st->print (" - name: "); name()->print_value_on(st); st->cr(); 1871 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 1872 st->print_cr(" - max stack: %d", max_stack()); 1873 st->print_cr(" - max locals: %d", max_locals()); 1874 st->print_cr(" - size of params: %d", size_of_parameters()); 1875 st->print_cr(" - method size: %d", method_size()); 1876 if (intrinsic_id() != vmIntrinsics::_none) 1877 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 1878 if (highest_comp_level() != CompLevel_none) 1879 st->print_cr(" - highest level: %d", highest_comp_level()); 1880 st->print_cr(" - vtable index: %d", _vtable_index); 1881 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry()); 1882 st->print( " - adapters: "); 1883 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 1884 if (a == NULL) 1885 st->print_cr(INTPTR_FORMAT, a); 1886 else 1887 a->print_adapter_on(st); 1888 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry()); 1889 st->print_cr(" - code size: %d", code_size()); 1890 if (code_size() != 0) { 1891 st->print_cr(" - code start: " INTPTR_FORMAT, code_base()); 1892 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size()); 1893 } 1894 if (method_data() != NULL) { 1895 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data()); 1896 } 1897 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 1898 if (checked_exceptions_length() > 0) { 1899 CheckedExceptionElement* table = checked_exceptions_start(); 1900 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table); 1901 if (Verbose) { 1902 for (int i = 0; i < checked_exceptions_length(); i++) { 1903 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 1904 } 1905 } 1906 } 1907 if (has_linenumber_table()) { 1908 u_char* table = compressed_linenumber_table(); 1909 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table); 1910 if (Verbose) { 1911 CompressedLineNumberReadStream stream(table); 1912 while (stream.read_pair()) { 1913 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 1914 } 1915 } 1916 } 1917 st->print_cr(" - localvar length: %d", localvariable_table_length()); 1918 if (localvariable_table_length() > 0) { 1919 LocalVariableTableElement* table = localvariable_table_start(); 1920 st->print_cr(" - localvar start: " INTPTR_FORMAT, table); 1921 if (Verbose) { 1922 for (int i = 0; i < localvariable_table_length(); i++) { 1923 int bci = table[i].start_bci; 1924 int len = table[i].length; 1925 const char* name = constants()->printable_name_at(table[i].name_cp_index); 1926 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 1927 int slot = table[i].slot; 1928 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 1929 } 1930 } 1931 } 1932 if (code() != NULL) { 1933 st->print (" - compiled code: "); 1934 code()->print_value_on(st); 1935 } 1936 if (is_native()) { 1937 st->print_cr(" - native function: " INTPTR_FORMAT, native_function()); 1938 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler()); 1939 } 1940 } 1941 1942 #endif //PRODUCT 1943 1944 void Method::print_value_on(outputStream* st) const { 1945 assert(is_method(), "must be method"); 1946 st->print_cr(internal_name()); 1947 print_address_on(st); 1948 st->print(" "); 1949 name()->print_value_on(st); 1950 st->print(" "); 1951 signature()->print_value_on(st); 1952 st->print(" in "); 1953 method_holder()->print_value_on(st); 1954 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 1955 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 1956 } 1957 1958 #if INCLUDE_SERVICES 1959 // Size Statistics 1960 void Method::collect_statistics(KlassSizeStats *sz) const { 1961 int mysize = sz->count(this); 1962 sz->_method_bytes += mysize; 1963 sz->_method_all_bytes += mysize; 1964 sz->_rw_bytes += mysize; 1965 1966 if (constMethod()) { 1967 constMethod()->collect_statistics(sz); 1968 } 1969 if (method_data()) { 1970 method_data()->collect_statistics(sz); 1971 } 1972 } 1973 #endif // INCLUDE_SERVICES 1974 1975 // Verification 1976 1977 void Method::verify_on(outputStream* st) { 1978 guarantee(is_method(), "object must be method"); 1979 guarantee(constants()->is_constantPool(), "should be constant pool"); 1980 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 1981 MethodData* md = method_data(); 1982 guarantee(md == NULL || 1983 md->is_methodData(), "should be method data"); 1984 }