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 bool Method::is_final_method(AccessFlags class_access_flags) const { 513 // or "does_not_require_vtable_entry" 514 // overpass can occur, is not final (reuses vtable entry) 515 // private methods get vtable entries for backward class compatibility. 516 if (is_overpass()) return false; 517 return is_final() || class_access_flags.is_final(); 518 } 519 520 bool Method::is_final_method() const { 521 return is_final_method(method_holder()->access_flags()); 522 } 523 524 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 525 if (is_final_method(class_access_flags)) return true; 526 #ifdef ASSERT 527 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 528 if (class_access_flags.is_interface()) assert(is_nonv == is_static(), err_msg("is_nonv=%s", is_nonv)); 529 #endif 530 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 531 return vtable_index() == nonvirtual_vtable_index; 532 } 533 534 bool Method::can_be_statically_bound() const { 535 return can_be_statically_bound(method_holder()->access_flags()); 536 } 537 538 bool Method::is_accessor() const { 539 if (code_size() != 5) return false; 540 if (size_of_parameters() != 1) return false; 541 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; 542 if (java_code_at(1) != Bytecodes::_getfield) return false; 543 if (java_code_at(4) != Bytecodes::_areturn && 544 java_code_at(4) != Bytecodes::_ireturn ) return false; 545 return true; 546 } 547 548 549 bool Method::is_initializer() const { 550 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); 551 } 552 553 bool Method::has_valid_initializer_flags() const { 554 return (is_static() || 555 method_holder()->major_version() < 51); 556 } 557 558 bool Method::is_static_initializer() const { 559 // For classfiles version 51 or greater, ensure that the clinit method is 560 // static. Non-static methods with the name "<clinit>" are not static 561 // initializers. (older classfiles exempted for backward compatibility) 562 return name() == vmSymbols::class_initializer_name() && 563 has_valid_initializer_flags(); 564 } 565 566 567 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) { 568 int length = this_oop->checked_exceptions_length(); 569 if (length == 0) { // common case 570 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 571 } else { 572 methodHandle h_this(THREAD, this_oop); 573 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 574 objArrayHandle mirrors (THREAD, m_oop); 575 for (int i = 0; i < length; i++) { 576 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 577 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 578 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 579 mirrors->obj_at_put(i, k->java_mirror()); 580 } 581 return mirrors; 582 } 583 }; 584 585 586 int Method::line_number_from_bci(int bci) const { 587 if (bci == SynchronizationEntryBCI) bci = 0; 588 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 589 int best_bci = 0; 590 int best_line = -1; 591 592 if (has_linenumber_table()) { 593 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 594 // Not necessarily sorted and not necessarily one-to-one. 595 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 596 while (stream.read_pair()) { 597 if (stream.bci() == bci) { 598 // perfect match 599 return stream.line(); 600 } else { 601 // update best_bci/line 602 if (stream.bci() < bci && stream.bci() >= best_bci) { 603 best_bci = stream.bci(); 604 best_line = stream.line(); 605 } 606 } 607 } 608 } 609 return best_line; 610 } 611 612 613 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 614 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 615 Thread *thread = Thread::current(); 616 Symbol* klass_name = constants()->klass_name_at(klass_index); 617 Handle loader(thread, method_holder()->class_loader()); 618 Handle prot (thread, method_holder()->protection_domain()); 619 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 620 } else { 621 return true; 622 } 623 } 624 625 626 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 627 int klass_index = constants()->klass_ref_index_at(refinfo_index); 628 if (must_be_resolved) { 629 // Make sure klass is resolved in constantpool. 630 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 631 } 632 return is_klass_loaded_by_klass_index(klass_index); 633 } 634 635 636 void Method::set_native_function(address function, bool post_event_flag) { 637 assert(function != NULL, "use clear_native_function to unregister natives"); 638 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 639 address* native_function = native_function_addr(); 640 641 // We can see racers trying to place the same native function into place. Once 642 // is plenty. 643 address current = *native_function; 644 if (current == function) return; 645 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 646 function != NULL) { 647 // native_method_throw_unsatisfied_link_error_entry() should only 648 // be passed when post_event_flag is false. 649 assert(function != 650 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 651 "post_event_flag mis-match"); 652 653 // post the bind event, and possible change the bind function 654 JvmtiExport::post_native_method_bind(this, &function); 655 } 656 *native_function = function; 657 // This function can be called more than once. We must make sure that we always 658 // use the latest registered method -> check if a stub already has been generated. 659 // If so, we have to make it not_entrant. 660 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 661 if (nm != NULL) { 662 nm->make_not_entrant(); 663 } 664 } 665 666 667 bool Method::has_native_function() const { 668 if (is_method_handle_intrinsic()) 669 return false; // special-cased in SharedRuntime::generate_native_wrapper 670 address func = native_function(); 671 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 672 } 673 674 675 void Method::clear_native_function() { 676 // Note: is_method_handle_intrinsic() is allowed here. 677 set_native_function( 678 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 679 !native_bind_event_is_interesting); 680 clear_code(); 681 } 682 683 address Method::critical_native_function() { 684 methodHandle mh(this); 685 return NativeLookup::lookup_critical_entry(mh); 686 } 687 688 689 void Method::set_signature_handler(address handler) { 690 address* signature_handler = signature_handler_addr(); 691 *signature_handler = handler; 692 } 693 694 695 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 696 if (PrintCompilation && report) { 697 ttyLocker ttyl; 698 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 699 if (comp_level == CompLevel_all) { 700 tty->print("all levels "); 701 } else { 702 tty->print("levels "); 703 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 704 tty->print("%d ", i); 705 } 706 } 707 this->print_short_name(tty); 708 int size = this->code_size(); 709 if (size > 0) { 710 tty->print(" (%d bytes)", size); 711 } 712 if (reason != NULL) { 713 tty->print(" %s", reason); 714 } 715 tty->cr(); 716 } 717 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 718 ttyLocker ttyl; 719 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'", 720 is_osr ? "osr_" : "", os::current_thread_id()); 721 if (reason != NULL) { 722 xtty->print(" reason=\'%s\'", reason); 723 } 724 xtty->method(this); 725 xtty->stamp(); 726 xtty->end_elem(); 727 } 728 } 729 730 bool Method::is_always_compilable() const { 731 // Generated adapters must be compiled 732 if (is_method_handle_intrinsic() && is_synthetic()) { 733 assert(!is_not_c1_compilable(), "sanity check"); 734 assert(!is_not_c2_compilable(), "sanity check"); 735 return true; 736 } 737 738 return false; 739 } 740 741 bool Method::is_not_compilable(int comp_level) const { 742 if (number_of_breakpoints() > 0) 743 return true; 744 if (is_always_compilable()) 745 return false; 746 if (comp_level == CompLevel_any) 747 return is_not_c1_compilable() || is_not_c2_compilable(); 748 if (is_c1_compile(comp_level)) 749 return is_not_c1_compilable(); 750 if (is_c2_compile(comp_level)) 751 return is_not_c2_compilable(); 752 return false; 753 } 754 755 // call this when compiler finds that this method is not compilable 756 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 757 if (is_always_compilable()) { 758 // Don't mark a method which should be always compilable 759 return; 760 } 761 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 762 if (comp_level == CompLevel_all) { 763 set_not_c1_compilable(); 764 set_not_c2_compilable(); 765 } else { 766 if (is_c1_compile(comp_level)) 767 set_not_c1_compilable(); 768 if (is_c2_compile(comp_level)) 769 set_not_c2_compilable(); 770 } 771 CompilationPolicy::policy()->disable_compilation(this); 772 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 773 } 774 775 bool Method::is_not_osr_compilable(int comp_level) const { 776 if (is_not_compilable(comp_level)) 777 return true; 778 if (comp_level == CompLevel_any) 779 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 780 if (is_c1_compile(comp_level)) 781 return is_not_c1_osr_compilable(); 782 if (is_c2_compile(comp_level)) 783 return is_not_c2_osr_compilable(); 784 return false; 785 } 786 787 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 788 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 789 if (comp_level == CompLevel_all) { 790 set_not_c1_osr_compilable(); 791 set_not_c2_osr_compilable(); 792 } else { 793 if (is_c1_compile(comp_level)) 794 set_not_c1_osr_compilable(); 795 if (is_c2_compile(comp_level)) 796 set_not_c2_osr_compilable(); 797 } 798 CompilationPolicy::policy()->disable_compilation(this); 799 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 800 } 801 802 // Revert to using the interpreter and clear out the nmethod 803 void Method::clear_code() { 804 805 // this may be NULL if c2i adapters have not been made yet 806 // Only should happen at allocate time. 807 if (_adapter == NULL) { 808 _from_compiled_entry = NULL; 809 } else { 810 _from_compiled_entry = _adapter->get_c2i_entry(); 811 } 812 OrderAccess::storestore(); 813 _from_interpreted_entry = _i2i_entry; 814 OrderAccess::storestore(); 815 _code = NULL; 816 } 817 818 // Called by class data sharing to remove any entry points (which are not shared) 819 void Method::unlink_method() { 820 _code = NULL; 821 _i2i_entry = NULL; 822 _from_interpreted_entry = NULL; 823 if (is_native()) { 824 *native_function_addr() = NULL; 825 set_signature_handler(NULL); 826 } 827 NOT_PRODUCT(set_compiled_invocation_count(0);) 828 _adapter = NULL; 829 _from_compiled_entry = NULL; 830 831 // In case of DumpSharedSpaces, _method_data should always be NULL. 832 // 833 // During runtime (!DumpSharedSpaces), when we are cleaning a 834 // shared class that failed to load, this->link_method() may 835 // have already been called (before an exception happened), so 836 // this->_method_data may not be NULL. 837 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?"); 838 839 set_method_data(NULL); 840 set_method_counters(NULL); 841 } 842 843 // Called when the method_holder is getting linked. Setup entrypoints so the method 844 // is ready to be called from interpreter, compiler, and vtables. 845 void Method::link_method(methodHandle h_method, TRAPS) { 846 // If the code cache is full, we may reenter this function for the 847 // leftover methods that weren't linked. 848 if (_i2i_entry != NULL) return; 849 850 assert(_adapter == NULL, "init'd to NULL" ); 851 assert( _code == NULL, "nothing compiled yet" ); 852 853 // Setup interpreter entrypoint 854 assert(this == h_method(), "wrong h_method()" ); 855 address entry = Interpreter::entry_for_method(h_method); 856 assert(entry != NULL, "interpreter entry must be non-null"); 857 // Sets both _i2i_entry and _from_interpreted_entry 858 set_interpreter_entry(entry); 859 860 // Don't overwrite already registered native entries. 861 if (is_native() && !has_native_function()) { 862 set_native_function( 863 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 864 !native_bind_event_is_interesting); 865 } 866 867 // Setup compiler entrypoint. This is made eagerly, so we do not need 868 // special handling of vtables. An alternative is to make adapters more 869 // lazily by calling make_adapter() from from_compiled_entry() for the 870 // normal calls. For vtable calls life gets more complicated. When a 871 // call-site goes mega-morphic we need adapters in all methods which can be 872 // called from the vtable. We need adapters on such methods that get loaded 873 // later. Ditto for mega-morphic itable calls. If this proves to be a 874 // problem we'll make these lazily later. 875 (void) make_adapters(h_method, CHECK); 876 877 // ONLY USE the h_method now as make_adapter may have blocked 878 879 } 880 881 address Method::make_adapters(methodHandle mh, TRAPS) { 882 // Adapters for compiled code are made eagerly here. They are fairly 883 // small (generally < 100 bytes) and quick to make (and cached and shared) 884 // so making them eagerly shouldn't be too expensive. 885 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 886 if (adapter == NULL ) { 887 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); 888 } 889 890 mh->set_adapter_entry(adapter); 891 mh->_from_compiled_entry = adapter->get_c2i_entry(); 892 return adapter->get_c2i_entry(); 893 } 894 895 // The verified_code_entry() must be called when a invoke is resolved 896 // on this method. 897 898 // It returns the compiled code entry point, after asserting not null. 899 // This function is called after potential safepoints so that nmethod 900 // or adapter that it points to is still live and valid. 901 // This function must not hit a safepoint! 902 address Method::verified_code_entry() { 903 debug_only(No_Safepoint_Verifier nsv;) 904 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 905 if (code == NULL && UseCodeCacheFlushing) { 906 nmethod *saved_code = CodeCache::reanimate_saved_code(this); 907 if (saved_code != NULL) { 908 methodHandle method(this); 909 assert( ! saved_code->is_osr_method(), "should not get here for osr" ); 910 set_code( method, saved_code ); 911 } 912 } 913 914 assert(_from_compiled_entry != NULL, "must be set"); 915 return _from_compiled_entry; 916 } 917 918 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 919 // (could be racing a deopt). 920 // Not inline to avoid circular ref. 921 bool Method::check_code() const { 922 // cached in a register or local. There's a race on the value of the field. 923 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 924 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 925 } 926 927 // Install compiled code. Instantly it can execute. 928 void Method::set_code(methodHandle mh, nmethod *code) { 929 assert( code, "use clear_code to remove code" ); 930 assert( mh->check_code(), "" ); 931 932 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 933 934 // These writes must happen in this order, because the interpreter will 935 // directly jump to from_interpreted_entry which jumps to an i2c adapter 936 // which jumps to _from_compiled_entry. 937 mh->_code = code; // Assign before allowing compiled code to exec 938 939 int comp_level = code->comp_level(); 940 // In theory there could be a race here. In practice it is unlikely 941 // and not worth worrying about. 942 if (comp_level > mh->highest_comp_level()) { 943 mh->set_highest_comp_level(comp_level); 944 } 945 946 OrderAccess::storestore(); 947 #ifdef SHARK 948 mh->_from_interpreted_entry = code->insts_begin(); 949 #else //!SHARK 950 mh->_from_compiled_entry = code->verified_entry_point(); 951 OrderAccess::storestore(); 952 // Instantly compiled code can execute. 953 if (!mh->is_method_handle_intrinsic()) 954 mh->_from_interpreted_entry = mh->get_i2c_entry(); 955 #endif //!SHARK 956 } 957 958 959 bool Method::is_overridden_in(Klass* k) const { 960 InstanceKlass* ik = InstanceKlass::cast(k); 961 962 if (ik->is_interface()) return false; 963 964 // If method is an interface, we skip it - except if it 965 // is a miranda method 966 if (method_holder()->is_interface()) { 967 // Check that method is not a miranda method 968 if (ik->lookup_method(name(), signature()) == NULL) { 969 // No implementation exist - so miranda method 970 return false; 971 } 972 return true; 973 } 974 975 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 976 assert(ik->vtable() != NULL, "vtable should exist"); 977 if (!has_vtable_index()) { 978 return false; 979 } else { 980 Method* vt_m = ik->method_at_vtable(vtable_index()); 981 return vt_m != this; 982 } 983 } 984 985 986 // give advice about whether this Method* should be cached or not 987 bool Method::should_not_be_cached() const { 988 if (is_old()) { 989 // This method has been redefined. It is either EMCP or obsolete 990 // and we don't want to cache it because that would pin the method 991 // down and prevent it from being collectible if and when it 992 // finishes executing. 993 return true; 994 } 995 996 // caching this method should be just fine 997 return false; 998 } 999 1000 1001 /** 1002 * Returns true if this is one of the specially treated methods for 1003 * security related stack walks (like Reflection.getCallerClass). 1004 */ 1005 bool Method::is_ignored_by_security_stack_walk() const { 1006 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection; 1007 1008 if (intrinsic_id() == vmIntrinsics::_invoke) { 1009 // This is Method.invoke() -- ignore it 1010 return true; 1011 } 1012 if (use_new_reflection && 1013 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1014 // This is an auxilary frame -- ignore it 1015 return true; 1016 } 1017 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1018 // This is an internal adapter frame for method handles -- ignore it 1019 return true; 1020 } 1021 return false; 1022 } 1023 1024 1025 // Constant pool structure for invoke methods: 1026 enum { 1027 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1028 _imcp_invoke_signature, // utf8: (variable Symbol*) 1029 _imcp_limit 1030 }; 1031 1032 // Test if this method is an MH adapter frame generated by Java code. 1033 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1034 bool Method::is_compiled_lambda_form() const { 1035 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1036 } 1037 1038 // Test if this method is an internal MH primitive method. 1039 bool Method::is_method_handle_intrinsic() const { 1040 vmIntrinsics::ID iid = intrinsic_id(); 1041 return (MethodHandles::is_signature_polymorphic(iid) && 1042 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1043 } 1044 1045 bool Method::has_member_arg() const { 1046 vmIntrinsics::ID iid = intrinsic_id(); 1047 return (MethodHandles::is_signature_polymorphic(iid) && 1048 MethodHandles::has_member_arg(iid)); 1049 } 1050 1051 // Make an instance of a signature-polymorphic internal MH primitive. 1052 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1053 Symbol* signature, 1054 TRAPS) { 1055 ResourceMark rm; 1056 methodHandle empty; 1057 1058 KlassHandle holder = SystemDictionary::MethodHandle_klass(); 1059 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1060 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1061 if (TraceMethodHandles) { 1062 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1063 } 1064 1065 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1066 name->increment_refcount(); 1067 signature->increment_refcount(); 1068 1069 int cp_length = _imcp_limit; 1070 ClassLoaderData* loader_data = holder->class_loader_data(); 1071 constantPoolHandle cp; 1072 { 1073 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1074 cp = constantPoolHandle(THREAD, cp_oop); 1075 } 1076 cp->set_pool_holder(InstanceKlass::cast(holder())); 1077 cp->symbol_at_put(_imcp_invoke_name, name); 1078 cp->symbol_at_put(_imcp_invoke_signature, signature); 1079 cp->set_has_preresolution(); 1080 1081 // decide on access bits: public or not? 1082 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1083 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1084 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1085 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1086 1087 methodHandle m; 1088 { 1089 InlineTableSizes sizes; 1090 Method* m_oop = Method::allocate(loader_data, 0, 1091 accessFlags_from(flags_bits), &sizes, 1092 ConstMethod::NORMAL, CHECK_(empty)); 1093 m = methodHandle(THREAD, m_oop); 1094 } 1095 m->set_constants(cp()); 1096 m->set_name_index(_imcp_invoke_name); 1097 m->set_signature_index(_imcp_invoke_signature); 1098 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1099 assert(m->signature() == signature, ""); 1100 #ifdef CC_INTERP 1101 ResultTypeFinder rtf(signature); 1102 m->set_result_index(rtf.type()); 1103 #endif 1104 m->compute_size_of_parameters(THREAD); 1105 m->init_intrinsic_id(); 1106 assert(m->is_method_handle_intrinsic(), ""); 1107 #ifdef ASSERT 1108 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1109 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1110 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1111 #endif //ASSERT 1112 1113 // Finally, set up its entry points. 1114 assert(m->can_be_statically_bound(), ""); 1115 m->set_vtable_index(Method::nonvirtual_vtable_index); 1116 m->link_method(m, CHECK_(empty)); 1117 1118 if (TraceMethodHandles && (Verbose || WizardMode)) 1119 m->print_on(tty); 1120 1121 return m; 1122 } 1123 1124 Klass* Method::check_non_bcp_klass(Klass* klass) { 1125 if (klass != NULL && klass->class_loader() != NULL) { 1126 if (klass->oop_is_objArray()) 1127 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1128 return klass; 1129 } 1130 return NULL; 1131 } 1132 1133 1134 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1135 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1136 // Code below does not work for native methods - they should never get rewritten anyway 1137 assert(!m->is_native(), "cannot rewrite native methods"); 1138 // Allocate new Method* 1139 AccessFlags flags = m->access_flags(); 1140 1141 ConstMethod* cm = m->constMethod(); 1142 int checked_exceptions_len = cm->checked_exceptions_length(); 1143 int localvariable_len = cm->localvariable_table_length(); 1144 int exception_table_len = cm->exception_table_length(); 1145 int method_parameters_len = cm->method_parameters_length(); 1146 int method_annotations_len = cm->method_annotations_length(); 1147 int parameter_annotations_len = cm->parameter_annotations_length(); 1148 int type_annotations_len = cm->type_annotations_length(); 1149 int default_annotations_len = cm->default_annotations_length(); 1150 1151 InlineTableSizes sizes( 1152 localvariable_len, 1153 new_compressed_linenumber_size, 1154 exception_table_len, 1155 checked_exceptions_len, 1156 method_parameters_len, 1157 cm->generic_signature_index(), 1158 method_annotations_len, 1159 parameter_annotations_len, 1160 type_annotations_len, 1161 default_annotations_len, 1162 0); 1163 1164 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1165 Method* newm_oop = Method::allocate(loader_data, 1166 new_code_length, 1167 flags, 1168 &sizes, 1169 m->method_type(), 1170 CHECK_(methodHandle())); 1171 methodHandle newm (THREAD, newm_oop); 1172 int new_method_size = newm->method_size(); 1173 1174 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1175 ConstMethod* newcm = newm->constMethod(); 1176 int new_const_method_size = newm->constMethod()->size(); 1177 1178 memcpy(newm(), m(), sizeof(Method)); 1179 1180 // Create shallow copy of ConstMethod. 1181 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1182 1183 // Reset correct method/const method, method size, and parameter info 1184 newm->set_constMethod(newcm); 1185 newm->constMethod()->set_code_size(new_code_length); 1186 newm->constMethod()->set_constMethod_size(new_const_method_size); 1187 newm->set_method_size(new_method_size); 1188 assert(newm->code_size() == new_code_length, "check"); 1189 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1190 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1191 assert(newm->exception_table_length() == exception_table_len, "check"); 1192 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1193 // Copy new byte codes 1194 memcpy(newm->code_base(), new_code, new_code_length); 1195 // Copy line number table 1196 if (new_compressed_linenumber_size > 0) { 1197 memcpy(newm->compressed_linenumber_table(), 1198 new_compressed_linenumber_table, 1199 new_compressed_linenumber_size); 1200 } 1201 // Copy method_parameters 1202 if (method_parameters_len > 0) { 1203 memcpy(newm->method_parameters_start(), 1204 m->method_parameters_start(), 1205 method_parameters_len * sizeof(MethodParametersElement)); 1206 } 1207 // Copy checked_exceptions 1208 if (checked_exceptions_len > 0) { 1209 memcpy(newm->checked_exceptions_start(), 1210 m->checked_exceptions_start(), 1211 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1212 } 1213 // Copy exception table 1214 if (exception_table_len > 0) { 1215 memcpy(newm->exception_table_start(), 1216 m->exception_table_start(), 1217 exception_table_len * sizeof(ExceptionTableElement)); 1218 } 1219 // Copy local variable number table 1220 if (localvariable_len > 0) { 1221 memcpy(newm->localvariable_table_start(), 1222 m->localvariable_table_start(), 1223 localvariable_len * sizeof(LocalVariableTableElement)); 1224 } 1225 // Copy stackmap table 1226 if (m->has_stackmap_table()) { 1227 int code_attribute_length = m->stackmap_data()->length(); 1228 Array<u1>* stackmap_data = 1229 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1230 memcpy((void*)stackmap_data->adr_at(0), 1231 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1232 newm->set_stackmap_data(stackmap_data); 1233 } 1234 1235 // copy annotations over to new method 1236 newcm->copy_annotations_from(cm); 1237 return newm; 1238 } 1239 1240 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) { 1241 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1242 // because we are not loading from core libraries 1243 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1244 // which does not use the class default class loader so we check for its loader here 1245 InstanceKlass* ik = InstanceKlass::cast(holder); 1246 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) { 1247 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1248 } 1249 1250 // see if the klass name is well-known: 1251 Symbol* klass_name = ik->name(); 1252 return vmSymbols::find_sid(klass_name); 1253 } 1254 1255 void Method::init_intrinsic_id() { 1256 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1257 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1258 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1259 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1260 1261 // the klass name is well-known: 1262 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1263 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1264 1265 // ditto for method and signature: 1266 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1267 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1268 && name_id == vmSymbols::NO_SID) 1269 return; 1270 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1271 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1272 && sig_id == vmSymbols::NO_SID) return; 1273 jshort flags = access_flags().as_short(); 1274 1275 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1276 if (id != vmIntrinsics::_none) { 1277 set_intrinsic_id(id); 1278 return; 1279 } 1280 1281 // A few slightly irregular cases: 1282 switch (klass_id) { 1283 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1284 // Second chance: check in regular Math. 1285 switch (name_id) { 1286 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1287 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1288 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1289 // pretend it is the corresponding method in the non-strict class: 1290 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1291 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1292 break; 1293 } 1294 break; 1295 1296 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. 1297 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1298 if (!is_native()) break; 1299 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1300 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1301 id = vmIntrinsics::_none; 1302 break; 1303 } 1304 1305 if (id != vmIntrinsics::_none) { 1306 // Set up its iid. It is an alias method. 1307 set_intrinsic_id(id); 1308 return; 1309 } 1310 } 1311 1312 // These two methods are static since a GC may move the Method 1313 bool Method::load_signature_classes(methodHandle m, TRAPS) { 1314 if (THREAD->is_Compiler_thread()) { 1315 // There is nothing useful this routine can do from within the Compile thread. 1316 // Hopefully, the signature contains only well-known classes. 1317 // We could scan for this and return true/false, but the caller won't care. 1318 return false; 1319 } 1320 bool sig_is_loaded = true; 1321 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1322 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1323 ResourceMark rm(THREAD); 1324 Symbol* signature = m->signature(); 1325 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1326 if (ss.is_object()) { 1327 Symbol* sym = ss.as_symbol(CHECK_(false)); 1328 Symbol* name = sym; 1329 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1330 protection_domain, THREAD); 1331 // We are loading classes eagerly. If a ClassNotFoundException or 1332 // a LinkageError was generated, be sure to ignore it. 1333 if (HAS_PENDING_EXCEPTION) { 1334 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1335 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1336 CLEAR_PENDING_EXCEPTION; 1337 } else { 1338 return false; 1339 } 1340 } 1341 if( klass == NULL) { sig_is_loaded = false; } 1342 } 1343 } 1344 return sig_is_loaded; 1345 } 1346 1347 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1348 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1349 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1350 ResourceMark rm(THREAD); 1351 Symbol* signature = m->signature(); 1352 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1353 if (ss.type() == T_OBJECT) { 1354 Symbol* name = ss.as_symbol_or_null(); 1355 if (name == NULL) return true; 1356 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1357 if (klass == NULL) return true; 1358 } 1359 } 1360 return false; 1361 } 1362 1363 // Exposed so field engineers can debug VM 1364 void Method::print_short_name(outputStream* st) { 1365 ResourceMark rm; 1366 #ifdef PRODUCT 1367 st->print(" %s::", method_holder()->external_name()); 1368 #else 1369 st->print(" %s::", method_holder()->internal_name()); 1370 #endif 1371 name()->print_symbol_on(st); 1372 if (WizardMode) signature()->print_symbol_on(st); 1373 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1374 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1375 } 1376 1377 // Comparer for sorting an object array containing 1378 // Method*s. 1379 static int method_comparator(Method* a, Method* b) { 1380 return a->name()->fast_compare(b->name()); 1381 } 1382 1383 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1384 void Method::sort_methods(Array<Method*>* methods, bool idempotent) { 1385 int length = methods->length(); 1386 if (length > 1) { 1387 { 1388 No_Safepoint_Verifier nsv; 1389 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); 1390 } 1391 // Reset method ordering 1392 for (int i = 0; i < length; i++) { 1393 Method* m = methods->at(i); 1394 m->set_method_idnum(i); 1395 } 1396 } 1397 } 1398 1399 1400 //----------------------------------------------------------------------------------- 1401 // Non-product code unless JVM/TI needs it 1402 1403 #if !defined(PRODUCT) || INCLUDE_JVMTI 1404 class SignatureTypePrinter : public SignatureTypeNames { 1405 private: 1406 outputStream* _st; 1407 bool _use_separator; 1408 1409 void type_name(const char* name) { 1410 if (_use_separator) _st->print(", "); 1411 _st->print(name); 1412 _use_separator = true; 1413 } 1414 1415 public: 1416 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1417 _st = st; 1418 _use_separator = false; 1419 } 1420 1421 void print_parameters() { _use_separator = false; iterate_parameters(); } 1422 void print_returntype() { _use_separator = false; iterate_returntype(); } 1423 }; 1424 1425 1426 void Method::print_name(outputStream* st) { 1427 Thread *thread = Thread::current(); 1428 ResourceMark rm(thread); 1429 SignatureTypePrinter sig(signature(), st); 1430 st->print("%s ", is_static() ? "static" : "virtual"); 1431 sig.print_returntype(); 1432 st->print(" %s.", method_holder()->internal_name()); 1433 name()->print_symbol_on(st); 1434 st->print("("); 1435 sig.print_parameters(); 1436 st->print(")"); 1437 } 1438 #endif // !PRODUCT || INCLUDE_JVMTI 1439 1440 1441 //----------------------------------------------------------------------------------- 1442 // Non-product code 1443 1444 #ifndef PRODUCT 1445 void Method::print_codes_on(outputStream* st) const { 1446 print_codes_on(0, code_size(), st); 1447 } 1448 1449 void Method::print_codes_on(int from, int to, outputStream* st) const { 1450 Thread *thread = Thread::current(); 1451 ResourceMark rm(thread); 1452 methodHandle mh (thread, (Method*)this); 1453 BytecodeStream s(mh); 1454 s.set_interval(from, to); 1455 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1456 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1457 } 1458 #endif // not PRODUCT 1459 1460 1461 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1462 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1463 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1464 // as end-of-stream terminator. 1465 1466 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1467 // bci and line number does not compress into single byte. 1468 // Write out escape character and use regular compression for bci and line number. 1469 write_byte((jubyte)0xFF); 1470 write_signed_int(bci_delta); 1471 write_signed_int(line_delta); 1472 } 1473 1474 // See comment in method.hpp which explains why this exists. 1475 #if defined(_M_AMD64) && _MSC_VER >= 1400 1476 #pragma optimize("", off) 1477 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1478 write_pair_inline(bci, line); 1479 } 1480 #pragma optimize("", on) 1481 #endif 1482 1483 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1484 _bci = 0; 1485 _line = 0; 1486 }; 1487 1488 1489 bool CompressedLineNumberReadStream::read_pair() { 1490 jubyte next = read_byte(); 1491 // Check for terminator 1492 if (next == 0) return false; 1493 if (next == 0xFF) { 1494 // Escape character, regular compression used 1495 _bci += read_signed_int(); 1496 _line += read_signed_int(); 1497 } else { 1498 // Single byte compression used 1499 _bci += next >> 3; 1500 _line += next & 0x7; 1501 } 1502 return true; 1503 } 1504 1505 1506 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1507 BreakpointInfo* bp = method_holder()->breakpoints(); 1508 for (; bp != NULL; bp = bp->next()) { 1509 if (bp->match(this, bci)) { 1510 return bp->orig_bytecode(); 1511 } 1512 } 1513 ShouldNotReachHere(); 1514 return Bytecodes::_shouldnotreachhere; 1515 } 1516 1517 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1518 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1519 BreakpointInfo* bp = method_holder()->breakpoints(); 1520 for (; bp != NULL; bp = bp->next()) { 1521 if (bp->match(this, bci)) { 1522 bp->set_orig_bytecode(code); 1523 // and continue, in case there is more than one 1524 } 1525 } 1526 } 1527 1528 void Method::set_breakpoint(int bci) { 1529 InstanceKlass* ik = method_holder(); 1530 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1531 bp->set_next(ik->breakpoints()); 1532 ik->set_breakpoints(bp); 1533 // do this last: 1534 bp->set(this); 1535 } 1536 1537 static void clear_matches(Method* m, int bci) { 1538 InstanceKlass* ik = m->method_holder(); 1539 BreakpointInfo* prev_bp = NULL; 1540 BreakpointInfo* next_bp; 1541 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1542 next_bp = bp->next(); 1543 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1544 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1545 // do this first: 1546 bp->clear(m); 1547 // unhook it 1548 if (prev_bp != NULL) 1549 prev_bp->set_next(next_bp); 1550 else 1551 ik->set_breakpoints(next_bp); 1552 delete bp; 1553 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1554 // at same location. So we have multiple matching (method_index and bci) 1555 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1556 // breakpoint for clear_breakpoint request and keep all other method versions 1557 // BreakpointInfo for future clear_breakpoint request. 1558 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1559 // which is being called when class is unloaded. We delete all the Breakpoint 1560 // information for all versions of method. We may not correctly restore the original 1561 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1562 // so these methods won't be used anymore. 1563 if (bci >= 0) { 1564 break; 1565 } 1566 } else { 1567 // This one is a keeper. 1568 prev_bp = bp; 1569 } 1570 } 1571 } 1572 1573 void Method::clear_breakpoint(int bci) { 1574 assert(bci >= 0, ""); 1575 clear_matches(this, bci); 1576 } 1577 1578 void Method::clear_all_breakpoints() { 1579 clear_matches(this, -1); 1580 } 1581 1582 1583 int Method::invocation_count() { 1584 MethodCounters *mcs = method_counters(); 1585 if (TieredCompilation) { 1586 MethodData* const mdo = method_data(); 1587 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1588 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1589 return InvocationCounter::count_limit; 1590 } else { 1591 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1592 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1593 } 1594 } else { 1595 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1596 } 1597 } 1598 1599 int Method::backedge_count() { 1600 MethodCounters *mcs = method_counters(); 1601 if (TieredCompilation) { 1602 MethodData* const mdo = method_data(); 1603 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1604 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1605 return InvocationCounter::count_limit; 1606 } else { 1607 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1608 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1609 } 1610 } else { 1611 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1612 } 1613 } 1614 1615 int Method::highest_comp_level() const { 1616 const MethodData* mdo = method_data(); 1617 if (mdo != NULL) { 1618 return mdo->highest_comp_level(); 1619 } else { 1620 return CompLevel_none; 1621 } 1622 } 1623 1624 int Method::highest_osr_comp_level() const { 1625 const MethodData* mdo = method_data(); 1626 if (mdo != NULL) { 1627 return mdo->highest_osr_comp_level(); 1628 } else { 1629 return CompLevel_none; 1630 } 1631 } 1632 1633 void Method::set_highest_comp_level(int level) { 1634 MethodData* mdo = method_data(); 1635 if (mdo != NULL) { 1636 mdo->set_highest_comp_level(level); 1637 } 1638 } 1639 1640 void Method::set_highest_osr_comp_level(int level) { 1641 MethodData* mdo = method_data(); 1642 if (mdo != NULL) { 1643 mdo->set_highest_osr_comp_level(level); 1644 } 1645 } 1646 1647 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1648 _bci = bci; 1649 _name_index = m->name_index(); 1650 _signature_index = m->signature_index(); 1651 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1652 if (_orig_bytecode == Bytecodes::_breakpoint) 1653 _orig_bytecode = m->orig_bytecode_at(_bci); 1654 _next = NULL; 1655 } 1656 1657 void BreakpointInfo::set(Method* method) { 1658 #ifdef ASSERT 1659 { 1660 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1661 if (code == Bytecodes::_breakpoint) 1662 code = method->orig_bytecode_at(_bci); 1663 assert(orig_bytecode() == code, "original bytecode must be the same"); 1664 } 1665 #endif 1666 Thread *thread = Thread::current(); 1667 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1668 method->incr_number_of_breakpoints(thread); 1669 SystemDictionary::notice_modification(); 1670 { 1671 // Deoptimize all dependents on this method 1672 HandleMark hm(thread); 1673 methodHandle mh(thread, method); 1674 Universe::flush_dependents_on_method(mh); 1675 } 1676 } 1677 1678 void BreakpointInfo::clear(Method* method) { 1679 *method->bcp_from(_bci) = orig_bytecode(); 1680 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1681 method->decr_number_of_breakpoints(Thread::current()); 1682 } 1683 1684 // jmethodID handling 1685 1686 // This is a block allocating object, sort of like JNIHandleBlock, only a 1687 // lot simpler. There aren't many of these, they aren't long, they are rarely 1688 // deleted and so we can do some suboptimal things. 1689 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1690 // never get rid of it. 1691 // It would be nice to be able to parameterize the number of methods for 1692 // the null_class_loader but then we'd have to turn this and ClassLoaderData 1693 // into templates. 1694 1695 // I feel like this brain dead class should exist somewhere in the STL 1696 1697 class JNIMethodBlock : public CHeapObj<mtClass> { 1698 enum { number_of_methods = 8 }; 1699 1700 Method* _methods[number_of_methods]; 1701 int _top; 1702 JNIMethodBlock* _next; 1703 public: 1704 static Method* const _free_method; 1705 1706 JNIMethodBlock() : _next(NULL), _top(0) { 1707 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method; 1708 } 1709 1710 Method** add_method(Method* m) { 1711 if (_top < number_of_methods) { 1712 // top points to the next free entry. 1713 int i = _top; 1714 _methods[i] = m; 1715 _top++; 1716 return &_methods[i]; 1717 } else if (_top == number_of_methods) { 1718 // if the next free entry ran off the block see if there's a free entry 1719 for (int i = 0; i< number_of_methods; i++) { 1720 if (_methods[i] == _free_method) { 1721 _methods[i] = m; 1722 return &_methods[i]; 1723 } 1724 } 1725 // Only check each block once for frees. They're very unlikely. 1726 // Increment top past the end of the block. 1727 _top++; 1728 } 1729 // need to allocate a next block. 1730 if (_next == NULL) { 1731 _next = new JNIMethodBlock(); 1732 } 1733 return _next->add_method(m); 1734 } 1735 1736 bool contains(Method** m) { 1737 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1738 for (int i = 0; i< number_of_methods; i++) { 1739 if (&(b->_methods[i]) == m) { 1740 return true; 1741 } 1742 } 1743 } 1744 return false; // not found 1745 } 1746 1747 // Doesn't really destroy it, just marks it as free so it can be reused. 1748 void destroy_method(Method** m) { 1749 #ifdef ASSERT 1750 assert(contains(m), "should be a methodID"); 1751 #endif // ASSERT 1752 *m = _free_method; 1753 } 1754 1755 // During class unloading the methods are cleared, which is different 1756 // than freed. 1757 void clear_all_methods() { 1758 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1759 for (int i = 0; i< number_of_methods; i++) { 1760 _methods[i] = NULL; 1761 } 1762 } 1763 } 1764 #ifndef PRODUCT 1765 int count_methods() { 1766 // count all allocated methods 1767 int count = 0; 1768 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1769 for (int i = 0; i< number_of_methods; i++) { 1770 if (_methods[i] != _free_method) count++; 1771 } 1772 } 1773 return count; 1774 } 1775 #endif // PRODUCT 1776 }; 1777 1778 // Something that can't be mistaken for an address or a markOop 1779 Method* const JNIMethodBlock::_free_method = (Method*)55; 1780 1781 // Add a method id to the jmethod_ids 1782 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 1783 ClassLoaderData* cld = loader_data; 1784 1785 if (!SafepointSynchronize::is_at_safepoint()) { 1786 // Have to add jmethod_ids() to class loader data thread-safely. 1787 // Also have to add the method to the list safely, which the cld lock 1788 // protects as well. 1789 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 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 } else { 1796 // At safepoint, we are single threaded and can set this. 1797 if (cld->jmethod_ids() == NULL) { 1798 cld->set_jmethod_ids(new JNIMethodBlock()); 1799 } 1800 // jmethodID is a pointer to Method* 1801 return (jmethodID)cld->jmethod_ids()->add_method(m); 1802 } 1803 } 1804 1805 // Mark a jmethodID as free. This is called when there is a data race in 1806 // InstanceKlass while creating the jmethodID cache. 1807 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 1808 ClassLoaderData* cld = loader_data; 1809 Method** ptr = (Method**)m; 1810 assert(cld->jmethod_ids() != NULL, "should have method handles"); 1811 cld->jmethod_ids()->destroy_method(ptr); 1812 } 1813 1814 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 1815 // Can't assert the method_holder is the same because the new method has the 1816 // scratch method holder. 1817 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 1818 == new_method->method_holder()->class_loader(), 1819 "changing to a different class loader"); 1820 // Just change the method in place, jmethodID pointer doesn't change. 1821 *((Method**)jmid) = new_method; 1822 } 1823 1824 bool Method::is_method_id(jmethodID mid) { 1825 Method* m = resolve_jmethod_id(mid); 1826 assert(m != NULL, "should be called with non-null method"); 1827 InstanceKlass* ik = m->method_holder(); 1828 ClassLoaderData* cld = ik->class_loader_data(); 1829 if (cld->jmethod_ids() == NULL) return false; 1830 return (cld->jmethod_ids()->contains((Method**)mid)); 1831 } 1832 1833 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 1834 if (mid == NULL) return NULL; 1835 Method* o = resolve_jmethod_id(mid); 1836 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 1837 return NULL; 1838 } 1839 return o; 1840 }; 1841 1842 void Method::set_on_stack(const bool value) { 1843 // Set both the method itself and its constant pool. The constant pool 1844 // on stack means some method referring to it is also on the stack. 1845 _access_flags.set_on_stack(value); 1846 constants()->set_on_stack(value); 1847 if (value) MetadataOnStackMark::record(this); 1848 } 1849 1850 // Called when the class loader is unloaded to make all methods weak. 1851 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 1852 loader_data->jmethod_ids()->clear_all_methods(); 1853 } 1854 1855 1856 // Check that this pointer is valid by checking that the vtbl pointer matches 1857 bool Method::is_valid_method() const { 1858 if (this == NULL) { 1859 return false; 1860 } else if (!is_metaspace_object()) { 1861 return false; 1862 } else { 1863 Method m; 1864 // This assumes that the vtbl pointer is the first word of a C++ object. 1865 // This assumption is also in universe.cpp patch_klass_vtble 1866 void* vtbl2 = dereference_vptr((void*)&m); 1867 void* this_vtbl = dereference_vptr((void*)this); 1868 return vtbl2 == this_vtbl; 1869 } 1870 } 1871 1872 #ifndef PRODUCT 1873 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 1874 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 1875 } 1876 #endif // PRODUCT 1877 1878 1879 // Printing 1880 1881 #ifndef PRODUCT 1882 1883 void Method::print_on(outputStream* st) const { 1884 ResourceMark rm; 1885 assert(is_method(), "must be method"); 1886 st->print_cr(internal_name()); 1887 // get the effect of PrintOopAddress, always, for methods: 1888 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this); 1889 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 1890 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants()); 1891 constants()->print_value_on(st); st->cr(); 1892 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 1893 st->print (" - name: "); name()->print_value_on(st); st->cr(); 1894 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 1895 st->print_cr(" - max stack: %d", max_stack()); 1896 st->print_cr(" - max locals: %d", max_locals()); 1897 st->print_cr(" - size of params: %d", size_of_parameters()); 1898 st->print_cr(" - method size: %d", method_size()); 1899 if (intrinsic_id() != vmIntrinsics::_none) 1900 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 1901 if (highest_comp_level() != CompLevel_none) 1902 st->print_cr(" - highest level: %d", highest_comp_level()); 1903 st->print_cr(" - vtable index: %d", _vtable_index); 1904 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry()); 1905 st->print( " - adapters: "); 1906 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 1907 if (a == NULL) 1908 st->print_cr(INTPTR_FORMAT, a); 1909 else 1910 a->print_adapter_on(st); 1911 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry()); 1912 st->print_cr(" - code size: %d", code_size()); 1913 if (code_size() != 0) { 1914 st->print_cr(" - code start: " INTPTR_FORMAT, code_base()); 1915 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size()); 1916 } 1917 if (method_data() != NULL) { 1918 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data()); 1919 } 1920 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 1921 if (checked_exceptions_length() > 0) { 1922 CheckedExceptionElement* table = checked_exceptions_start(); 1923 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table); 1924 if (Verbose) { 1925 for (int i = 0; i < checked_exceptions_length(); i++) { 1926 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 1927 } 1928 } 1929 } 1930 if (has_linenumber_table()) { 1931 u_char* table = compressed_linenumber_table(); 1932 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table); 1933 if (Verbose) { 1934 CompressedLineNumberReadStream stream(table); 1935 while (stream.read_pair()) { 1936 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 1937 } 1938 } 1939 } 1940 st->print_cr(" - localvar length: %d", localvariable_table_length()); 1941 if (localvariable_table_length() > 0) { 1942 LocalVariableTableElement* table = localvariable_table_start(); 1943 st->print_cr(" - localvar start: " INTPTR_FORMAT, table); 1944 if (Verbose) { 1945 for (int i = 0; i < localvariable_table_length(); i++) { 1946 int bci = table[i].start_bci; 1947 int len = table[i].length; 1948 const char* name = constants()->printable_name_at(table[i].name_cp_index); 1949 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 1950 int slot = table[i].slot; 1951 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 1952 } 1953 } 1954 } 1955 if (code() != NULL) { 1956 st->print (" - compiled code: "); 1957 code()->print_value_on(st); 1958 } 1959 if (is_native()) { 1960 st->print_cr(" - native function: " INTPTR_FORMAT, native_function()); 1961 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler()); 1962 } 1963 } 1964 1965 #endif //PRODUCT 1966 1967 void Method::print_value_on(outputStream* st) const { 1968 assert(is_method(), "must be method"); 1969 st->print(internal_name()); 1970 print_address_on(st); 1971 st->print(" "); 1972 name()->print_value_on(st); 1973 st->print(" "); 1974 signature()->print_value_on(st); 1975 st->print(" in "); 1976 method_holder()->print_value_on(st); 1977 if (WizardMode) st->print("#%d", _vtable_index); 1978 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 1979 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 1980 } 1981 1982 #if INCLUDE_SERVICES 1983 // Size Statistics 1984 void Method::collect_statistics(KlassSizeStats *sz) const { 1985 int mysize = sz->count(this); 1986 sz->_method_bytes += mysize; 1987 sz->_method_all_bytes += mysize; 1988 sz->_rw_bytes += mysize; 1989 1990 if (constMethod()) { 1991 constMethod()->collect_statistics(sz); 1992 } 1993 if (method_data()) { 1994 method_data()->collect_statistics(sz); 1995 } 1996 } 1997 #endif // INCLUDE_SERVICES 1998 1999 // Verification 2000 2001 void Method::verify_on(outputStream* st) { 2002 guarantee(is_method(), "object must be method"); 2003 guarantee(constants()->is_constantPool(), "should be constant pool"); 2004 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 2005 MethodData* md = method_data(); 2006 guarantee(md == NULL || 2007 md->is_methodData(), "should be method data"); 2008 }