1 /* 2 * Copyright (c) 1997, 2014, 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/orderAccess.inline.hpp" 53 #include "runtime/relocator.hpp" 54 #include "runtime/sharedRuntime.hpp" 55 #include "runtime/signature.hpp" 56 #include "utilities/quickSort.hpp" 57 #include "utilities/xmlstream.hpp" 58 59 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 60 61 // Implementation of Method 62 63 Method* Method::allocate(ClassLoaderData* loader_data, 64 int byte_code_size, 65 AccessFlags access_flags, 66 InlineTableSizes* sizes, 67 ConstMethod::MethodType method_type, 68 TRAPS) { 69 assert(!access_flags.is_native() || byte_code_size == 0, 70 "native methods should not contain byte codes"); 71 ConstMethod* cm = ConstMethod::allocate(loader_data, 72 byte_code_size, 73 sizes, 74 method_type, 75 CHECK_NULL); 76 77 int size = Method::size(access_flags.is_native()); 78 79 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, size); 80 } 81 82 Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) { 83 No_Safepoint_Verifier no_safepoint; 84 set_constMethod(xconst); 85 set_access_flags(access_flags); 86 set_method_size(size); 87 #ifdef CC_INTERP 88 set_result_index(T_VOID); 89 #endif 90 set_intrinsic_id(vmIntrinsics::_none); 91 set_jfr_towrite(false); 92 set_force_inline(false); 93 set_hidden(false); 94 set_dont_inline(false); 95 set_method_data(NULL); 96 set_method_counters(NULL); 97 set_vtable_index(Method::garbage_vtable_index); 98 99 // Fix and bury in Method* 100 set_interpreter_entry(NULL); // sets i2i entry and from_int 101 set_adapter_entry(NULL); 102 clear_code(); // from_c/from_i get set to c2i/i2i 103 104 if (access_flags.is_native()) { 105 clear_native_function(); 106 set_signature_handler(NULL); 107 } 108 109 NOT_PRODUCT(set_compiled_invocation_count(0);) 110 } 111 112 // Release Method*. The nmethod will be gone when we get here because 113 // we've walked the code cache. 114 void Method::deallocate_contents(ClassLoaderData* loader_data) { 115 MetadataFactory::free_metadata(loader_data, constMethod()); 116 set_constMethod(NULL); 117 MetadataFactory::free_metadata(loader_data, method_data()); 118 set_method_data(NULL); 119 MetadataFactory::free_metadata(loader_data, method_counters()); 120 set_method_counters(NULL); 121 // The nmethod will be gone when we get here. 122 if (code() != NULL) _code = NULL; 123 } 124 125 address Method::get_i2c_entry() { 126 assert(_adapter != NULL, "must have"); 127 return _adapter->get_i2c_entry(); 128 } 129 130 address Method::get_c2i_entry() { 131 assert(_adapter != NULL, "must have"); 132 return _adapter->get_c2i_entry(); 133 } 134 135 address Method::get_c2i_unverified_entry() { 136 assert(_adapter != NULL, "must have"); 137 return _adapter->get_c2i_unverified_entry(); 138 } 139 140 char* Method::name_and_sig_as_C_string() const { 141 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 142 } 143 144 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 145 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 146 } 147 148 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 149 const char* klass_name = klass->external_name(); 150 int klass_name_len = (int)strlen(klass_name); 151 int method_name_len = method_name->utf8_length(); 152 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 153 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 154 strcpy(dest, klass_name); 155 dest[klass_name_len] = '.'; 156 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 157 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 158 dest[len] = 0; 159 return dest; 160 } 161 162 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 163 Symbol* klass_name = klass->name(); 164 klass_name->as_klass_external_name(buf, size); 165 int len = (int)strlen(buf); 166 167 if (len < size - 1) { 168 buf[len++] = '.'; 169 170 method_name->as_C_string(&(buf[len]), size - len); 171 len = (int)strlen(buf); 172 173 signature->as_C_string(&(buf[len]), size - len); 174 } 175 176 return buf; 177 } 178 179 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) { 180 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 181 // access exception table 182 ExceptionTable table(mh()); 183 int length = table.length(); 184 // iterate through all entries sequentially 185 constantPoolHandle pool(THREAD, mh->constants()); 186 for (int i = 0; i < length; i ++) { 187 //reacquire the table in case a GC happened 188 ExceptionTable table(mh()); 189 int beg_bci = table.start_pc(i); 190 int end_bci = table.end_pc(i); 191 assert(beg_bci <= end_bci, "inconsistent exception table"); 192 if (beg_bci <= throw_bci && throw_bci < end_bci) { 193 // exception handler bci range covers throw_bci => investigate further 194 int handler_bci = table.handler_pc(i); 195 int klass_index = table.catch_type_index(i); 196 if (klass_index == 0) { 197 return handler_bci; 198 } else if (ex_klass.is_null()) { 199 return handler_bci; 200 } else { 201 // we know the exception class => get the constraint class 202 // this may require loading of the constraint class; if verification 203 // fails or some other exception occurs, return handler_bci 204 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); 205 KlassHandle klass = KlassHandle(THREAD, k); 206 assert(klass.not_null(), "klass not loaded"); 207 if (ex_klass->is_subtype_of(klass())) { 208 return handler_bci; 209 } 210 } 211 } 212 } 213 214 return -1; 215 } 216 217 void Method::mask_for(int bci, InterpreterOopMap* mask) { 218 219 Thread* myThread = Thread::current(); 220 methodHandle h_this(myThread, this); 221 #ifdef ASSERT 222 bool has_capability = myThread->is_VM_thread() || 223 myThread->is_ConcurrentGC_thread() || 224 myThread->is_GC_task_thread(); 225 226 if (!has_capability) { 227 if (!VerifyStack && !VerifyLastFrame) { 228 // verify stack calls this outside VM thread 229 warning("oopmap should only be accessed by the " 230 "VM, GC task or CMS threads (or during debugging)"); 231 InterpreterOopMap local_mask; 232 method_holder()->mask_for(h_this, bci, &local_mask); 233 local_mask.print(); 234 } 235 } 236 #endif 237 method_holder()->mask_for(h_this, bci, mask); 238 return; 239 } 240 241 242 int Method::bci_from(address bcp) const { 243 #ifdef ASSERT 244 { ResourceMark rm; 245 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), 246 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string())); 247 } 248 #endif 249 return bcp - code_base(); 250 } 251 252 253 // Return (int)bcx if it appears to be a valid BCI. 254 // Return bci_from((address)bcx) if it appears to be a valid BCP. 255 // Return -1 otherwise. 256 // Used by profiling code, when invalid data is a possibility. 257 // The caller is responsible for validating the Method* itself. 258 int Method::validate_bci_from_bcx(intptr_t bcx) const { 259 // keep bci as -1 if not a valid bci 260 int bci = -1; 261 if (bcx == 0 || (address)bcx == code_base()) { 262 // code_size() may return 0 and we allow 0 here 263 // the method may be native 264 bci = 0; 265 } else if (frame::is_bci(bcx)) { 266 if (bcx < code_size()) { 267 bci = (int)bcx; 268 } 269 } else if (contains((address)bcx)) { 270 bci = (address)bcx - code_base(); 271 } 272 // Assert that if we have dodged any asserts, bci is negative. 273 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 274 return bci; 275 } 276 277 address Method::bcp_from(int bci) const { 278 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), err_msg("illegal bci: %d", bci)); 279 address bcp = code_base() + bci; 280 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 281 return bcp; 282 } 283 284 285 int Method::size(bool is_native) { 286 // If native, then include pointers for native_function and signature_handler 287 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 288 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; 289 return align_object_size(header_size() + extra_words); 290 } 291 292 293 Symbol* Method::klass_name() const { 294 Klass* k = method_holder(); 295 assert(k->is_klass(), "must be klass"); 296 InstanceKlass* ik = (InstanceKlass*) k; 297 return ik->name(); 298 } 299 300 301 // Attempt to return method oop to original state. Clear any pointers 302 // (to objects outside the shared spaces). We won't be able to predict 303 // where they should point in a new JVM. Further initialize some 304 // entries now in order allow them to be write protected later. 305 306 void Method::remove_unshareable_info() { 307 unlink_method(); 308 } 309 310 311 bool Method::was_executed_more_than(int n) { 312 // Invocation counter is reset when the Method* is compiled. 313 // If the method has compiled code we therefore assume it has 314 // be excuted more than n times. 315 if (is_accessor() || is_empty_method() || (code() != NULL)) { 316 // interpreter doesn't bump invocation counter of trivial methods 317 // compiler does not bump invocation counter of compiled methods 318 return true; 319 } 320 else if ((method_counters() != NULL && 321 method_counters()->invocation_counter()->carry()) || 322 (method_data() != NULL && 323 method_data()->invocation_counter()->carry())) { 324 // The carry bit is set when the counter overflows and causes 325 // a compilation to occur. We don't know how many times 326 // the counter has been reset, so we simply assume it has 327 // been executed more than n times. 328 return true; 329 } else { 330 return invocation_count() > n; 331 } 332 } 333 334 void Method::print_invocation_count() { 335 if (is_static()) tty->print("static "); 336 if (is_final()) tty->print("final "); 337 if (is_synchronized()) tty->print("synchronized "); 338 if (is_native()) tty->print("native "); 339 tty->print("%s::", method_holder()->external_name()); 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 #ifndef PRODUCT 353 if (CountCompiledCalls) { 354 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 355 } 356 #endif 357 } 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 // default method or overpass can occur, is not final (reuses vtable entry) 515 // private methods get vtable entries for backward class compatibility. 516 if (is_overpass() || is_default_method()) 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::is_default_method() const { 525 if (method_holder() != NULL && 526 method_holder()->is_interface() && 527 !is_abstract()) { 528 return true; 529 } else { 530 return false; 531 } 532 } 533 534 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 535 if (is_final_method(class_access_flags)) return true; 536 #ifdef ASSERT 537 ResourceMark rm; 538 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 539 if (class_access_flags.is_interface()) { 540 assert(is_nonv == is_static(), err_msg("is_nonv=%s", name_and_sig_as_C_string())); 541 } 542 #endif 543 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 544 return vtable_index() == nonvirtual_vtable_index; 545 } 546 547 bool Method::can_be_statically_bound() const { 548 return can_be_statically_bound(method_holder()->access_flags()); 549 } 550 551 bool Method::is_accessor() const { 552 if (code_size() != 5) return false; 553 if (size_of_parameters() != 1) return false; 554 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; 555 if (java_code_at(1) != Bytecodes::_getfield) return false; 556 if (java_code_at(4) != Bytecodes::_areturn && 557 java_code_at(4) != Bytecodes::_ireturn ) return false; 558 return true; 559 } 560 561 562 bool Method::is_initializer() const { 563 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); 564 } 565 566 bool Method::has_valid_initializer_flags() const { 567 return (is_static() || 568 method_holder()->major_version() < 51); 569 } 570 571 bool Method::is_static_initializer() const { 572 // For classfiles version 51 or greater, ensure that the clinit method is 573 // static. Non-static methods with the name "<clinit>" are not static 574 // initializers. (older classfiles exempted for backward compatibility) 575 return name() == vmSymbols::class_initializer_name() && 576 has_valid_initializer_flags(); 577 } 578 579 580 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 581 int length = method->checked_exceptions_length(); 582 if (length == 0) { // common case 583 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 584 } else { 585 methodHandle h_this(THREAD, method); 586 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 587 objArrayHandle mirrors (THREAD, m_oop); 588 for (int i = 0; i < length; i++) { 589 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 590 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 591 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 592 mirrors->obj_at_put(i, k->java_mirror()); 593 } 594 return mirrors; 595 } 596 }; 597 598 599 int Method::line_number_from_bci(int bci) const { 600 if (bci == SynchronizationEntryBCI) bci = 0; 601 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 602 int best_bci = 0; 603 int best_line = -1; 604 605 if (has_linenumber_table()) { 606 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 607 // Not necessarily sorted and not necessarily one-to-one. 608 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 609 while (stream.read_pair()) { 610 if (stream.bci() == bci) { 611 // perfect match 612 return stream.line(); 613 } else { 614 // update best_bci/line 615 if (stream.bci() < bci && stream.bci() >= best_bci) { 616 best_bci = stream.bci(); 617 best_line = stream.line(); 618 } 619 } 620 } 621 } 622 return best_line; 623 } 624 625 626 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 627 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 628 Thread *thread = Thread::current(); 629 Symbol* klass_name = constants()->klass_name_at(klass_index); 630 Handle loader(thread, method_holder()->class_loader()); 631 Handle prot (thread, method_holder()->protection_domain()); 632 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 633 } else { 634 return true; 635 } 636 } 637 638 639 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 640 int klass_index = constants()->klass_ref_index_at(refinfo_index); 641 if (must_be_resolved) { 642 // Make sure klass is resolved in constantpool. 643 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 644 } 645 return is_klass_loaded_by_klass_index(klass_index); 646 } 647 648 649 void Method::set_native_function(address function, bool post_event_flag) { 650 assert(function != NULL, "use clear_native_function to unregister natives"); 651 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 652 address* native_function = native_function_addr(); 653 654 // We can see racers trying to place the same native function into place. Once 655 // is plenty. 656 address current = *native_function; 657 if (current == function) return; 658 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 659 function != NULL) { 660 // native_method_throw_unsatisfied_link_error_entry() should only 661 // be passed when post_event_flag is false. 662 assert(function != 663 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 664 "post_event_flag mis-match"); 665 666 // post the bind event, and possible change the bind function 667 JvmtiExport::post_native_method_bind(this, &function); 668 } 669 *native_function = function; 670 // This function can be called more than once. We must make sure that we always 671 // use the latest registered method -> check if a stub already has been generated. 672 // If so, we have to make it not_entrant. 673 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 674 if (nm != NULL) { 675 nm->make_not_entrant(); 676 } 677 } 678 679 680 bool Method::has_native_function() const { 681 if (is_method_handle_intrinsic()) 682 return false; // special-cased in SharedRuntime::generate_native_wrapper 683 address func = native_function(); 684 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 685 } 686 687 688 void Method::clear_native_function() { 689 // Note: is_method_handle_intrinsic() is allowed here. 690 set_native_function( 691 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 692 !native_bind_event_is_interesting); 693 clear_code(); 694 } 695 696 address Method::critical_native_function() { 697 methodHandle mh(this); 698 return NativeLookup::lookup_critical_entry(mh); 699 } 700 701 702 void Method::set_signature_handler(address handler) { 703 address* signature_handler = signature_handler_addr(); 704 *signature_handler = handler; 705 } 706 707 708 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 709 if (PrintCompilation && report) { 710 ttyLocker ttyl; 711 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 712 if (comp_level == CompLevel_all) { 713 tty->print("all levels "); 714 } else { 715 tty->print("levels "); 716 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 717 tty->print("%d ", i); 718 } 719 } 720 this->print_short_name(tty); 721 int size = this->code_size(); 722 if (size > 0) { 723 tty->print(" (%d bytes)", size); 724 } 725 if (reason != NULL) { 726 tty->print(" %s", reason); 727 } 728 tty->cr(); 729 } 730 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 731 ttyLocker ttyl; 732 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'", 733 is_osr ? "osr_" : "", os::current_thread_id()); 734 if (reason != NULL) { 735 xtty->print(" reason=\'%s\'", reason); 736 } 737 xtty->method(this); 738 xtty->stamp(); 739 xtty->end_elem(); 740 } 741 } 742 743 bool Method::is_always_compilable() const { 744 // Generated adapters must be compiled 745 if (is_method_handle_intrinsic() && is_synthetic()) { 746 assert(!is_not_c1_compilable(), "sanity check"); 747 assert(!is_not_c2_compilable(), "sanity check"); 748 return true; 749 } 750 751 return false; 752 } 753 754 bool Method::is_not_compilable(int comp_level) const { 755 if (number_of_breakpoints() > 0) 756 return true; 757 if (is_always_compilable()) 758 return false; 759 if (comp_level == CompLevel_any) 760 return is_not_c1_compilable() || is_not_c2_compilable(); 761 if (is_c1_compile(comp_level)) 762 return is_not_c1_compilable(); 763 if (is_c2_compile(comp_level)) 764 return is_not_c2_compilable(); 765 return false; 766 } 767 768 // call this when compiler finds that this method is not compilable 769 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 770 if (is_always_compilable()) { 771 // Don't mark a method which should be always compilable 772 return; 773 } 774 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 775 if (comp_level == CompLevel_all) { 776 set_not_c1_compilable(); 777 set_not_c2_compilable(); 778 } else { 779 if (is_c1_compile(comp_level)) 780 set_not_c1_compilable(); 781 if (is_c2_compile(comp_level)) 782 set_not_c2_compilable(); 783 } 784 CompilationPolicy::policy()->disable_compilation(this); 785 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 786 } 787 788 bool Method::is_not_osr_compilable(int comp_level) const { 789 if (is_not_compilable(comp_level)) 790 return true; 791 if (comp_level == CompLevel_any) 792 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 793 if (is_c1_compile(comp_level)) 794 return is_not_c1_osr_compilable(); 795 if (is_c2_compile(comp_level)) 796 return is_not_c2_osr_compilable(); 797 return false; 798 } 799 800 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 801 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 802 if (comp_level == CompLevel_all) { 803 set_not_c1_osr_compilable(); 804 set_not_c2_osr_compilable(); 805 } else { 806 if (is_c1_compile(comp_level)) 807 set_not_c1_osr_compilable(); 808 if (is_c2_compile(comp_level)) 809 set_not_c2_osr_compilable(); 810 } 811 CompilationPolicy::policy()->disable_compilation(this); 812 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 813 } 814 815 // Revert to using the interpreter and clear out the nmethod 816 void Method::clear_code() { 817 818 // this may be NULL if c2i adapters have not been made yet 819 // Only should happen at allocate time. 820 if (_adapter == NULL) { 821 _from_compiled_entry = NULL; 822 } else { 823 _from_compiled_entry = _adapter->get_c2i_entry(); 824 } 825 OrderAccess::storestore(); 826 _from_interpreted_entry = _i2i_entry; 827 OrderAccess::storestore(); 828 _code = NULL; 829 } 830 831 // Called by class data sharing to remove any entry points (which are not shared) 832 void Method::unlink_method() { 833 _code = NULL; 834 _i2i_entry = NULL; 835 _from_interpreted_entry = NULL; 836 if (is_native()) { 837 *native_function_addr() = NULL; 838 set_signature_handler(NULL); 839 } 840 NOT_PRODUCT(set_compiled_invocation_count(0);) 841 _adapter = NULL; 842 _from_compiled_entry = NULL; 843 844 // In case of DumpSharedSpaces, _method_data should always be NULL. 845 // 846 // During runtime (!DumpSharedSpaces), when we are cleaning a 847 // shared class that failed to load, this->link_method() may 848 // have already been called (before an exception happened), so 849 // this->_method_data may not be NULL. 850 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?"); 851 852 set_method_data(NULL); 853 set_method_counters(NULL); 854 } 855 856 // Called when the method_holder is getting linked. Setup entrypoints so the method 857 // is ready to be called from interpreter, compiler, and vtables. 858 void Method::link_method(methodHandle h_method, TRAPS) { 859 // If the code cache is full, we may reenter this function for the 860 // leftover methods that weren't linked. 861 if (_i2i_entry != NULL) return; 862 863 assert(_adapter == NULL, "init'd to NULL" ); 864 assert( _code == NULL, "nothing compiled yet" ); 865 866 // Setup interpreter entrypoint 867 assert(this == h_method(), "wrong h_method()" ); 868 address entry = Interpreter::entry_for_method(h_method); 869 assert(entry != NULL, "interpreter entry must be non-null"); 870 // Sets both _i2i_entry and _from_interpreted_entry 871 set_interpreter_entry(entry); 872 873 // Don't overwrite already registered native entries. 874 if (is_native() && !has_native_function()) { 875 set_native_function( 876 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 877 !native_bind_event_is_interesting); 878 } 879 880 // Setup compiler entrypoint. This is made eagerly, so we do not need 881 // special handling of vtables. An alternative is to make adapters more 882 // lazily by calling make_adapter() from from_compiled_entry() for the 883 // normal calls. For vtable calls life gets more complicated. When a 884 // call-site goes mega-morphic we need adapters in all methods which can be 885 // called from the vtable. We need adapters on such methods that get loaded 886 // later. Ditto for mega-morphic itable calls. If this proves to be a 887 // problem we'll make these lazily later. 888 (void) make_adapters(h_method, CHECK); 889 890 // ONLY USE the h_method now as make_adapter may have blocked 891 892 } 893 894 address Method::make_adapters(methodHandle mh, TRAPS) { 895 // Adapters for compiled code are made eagerly here. They are fairly 896 // small (generally < 100 bytes) and quick to make (and cached and shared) 897 // so making them eagerly shouldn't be too expensive. 898 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 899 if (adapter == NULL ) { 900 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); 901 } 902 903 mh->set_adapter_entry(adapter); 904 mh->_from_compiled_entry = adapter->get_c2i_entry(); 905 return adapter->get_c2i_entry(); 906 } 907 908 void Method::restore_unshareable_info(TRAPS) { 909 // Since restore_unshareable_info can be called more than once for a method, don't 910 // redo any work. If this field is restored, there is nothing to do. 911 if (_from_compiled_entry == NULL) { 912 // restore method's vtable by calling a virtual function 913 restore_vtable(); 914 915 methodHandle mh(THREAD, this); 916 link_method(mh, CHECK); 917 } 918 } 919 920 921 // The verified_code_entry() must be called when a invoke is resolved 922 // on this method. 923 924 // It returns the compiled code entry point, after asserting not null. 925 // This function is called after potential safepoints so that nmethod 926 // or adapter that it points to is still live and valid. 927 // This function must not hit a safepoint! 928 address Method::verified_code_entry() { 929 debug_only(No_Safepoint_Verifier nsv;) 930 assert(_from_compiled_entry != NULL, "must be set"); 931 return _from_compiled_entry; 932 } 933 934 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 935 // (could be racing a deopt). 936 // Not inline to avoid circular ref. 937 bool Method::check_code() const { 938 // cached in a register or local. There's a race on the value of the field. 939 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 940 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 941 } 942 943 // Install compiled code. Instantly it can execute. 944 void Method::set_code(methodHandle mh, nmethod *code) { 945 assert( code, "use clear_code to remove code" ); 946 assert( mh->check_code(), "" ); 947 948 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 949 950 // These writes must happen in this order, because the interpreter will 951 // directly jump to from_interpreted_entry which jumps to an i2c adapter 952 // which jumps to _from_compiled_entry. 953 mh->_code = code; // Assign before allowing compiled code to exec 954 955 int comp_level = code->comp_level(); 956 // In theory there could be a race here. In practice it is unlikely 957 // and not worth worrying about. 958 if (comp_level > mh->highest_comp_level()) { 959 mh->set_highest_comp_level(comp_level); 960 } 961 962 OrderAccess::storestore(); 963 #ifdef SHARK 964 mh->_from_interpreted_entry = code->insts_begin(); 965 #else //!SHARK 966 mh->_from_compiled_entry = code->verified_entry_point(); 967 OrderAccess::storestore(); 968 // Instantly compiled code can execute. 969 if (!mh->is_method_handle_intrinsic()) 970 mh->_from_interpreted_entry = mh->get_i2c_entry(); 971 #endif //!SHARK 972 } 973 974 975 bool Method::is_overridden_in(Klass* k) const { 976 InstanceKlass* ik = InstanceKlass::cast(k); 977 978 if (ik->is_interface()) return false; 979 980 // If method is an interface, we skip it - except if it 981 // is a miranda method 982 if (method_holder()->is_interface()) { 983 // Check that method is not a miranda method 984 if (ik->lookup_method(name(), signature()) == NULL) { 985 // No implementation exist - so miranda method 986 return false; 987 } 988 return true; 989 } 990 991 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 992 assert(ik->vtable() != NULL, "vtable should exist"); 993 if (!has_vtable_index()) { 994 return false; 995 } else { 996 Method* vt_m = ik->method_at_vtable(vtable_index()); 997 return vt_m != this; 998 } 999 } 1000 1001 1002 // give advice about whether this Method* should be cached or not 1003 bool Method::should_not_be_cached() const { 1004 if (is_old()) { 1005 // This method has been redefined. It is either EMCP or obsolete 1006 // and we don't want to cache it because that would pin the method 1007 // down and prevent it from being collectible if and when it 1008 // finishes executing. 1009 return true; 1010 } 1011 1012 // caching this method should be just fine 1013 return false; 1014 } 1015 1016 1017 /** 1018 * Returns true if this is one of the specially treated methods for 1019 * security related stack walks (like Reflection.getCallerClass). 1020 */ 1021 bool Method::is_ignored_by_security_stack_walk() const { 1022 if (intrinsic_id() == vmIntrinsics::_invoke) { 1023 // This is Method.invoke() -- ignore it 1024 return true; 1025 } 1026 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1027 // This is an auxilary frame -- ignore it 1028 return true; 1029 } 1030 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1031 // This is an internal adapter frame for method handles -- ignore it 1032 return true; 1033 } 1034 return false; 1035 } 1036 1037 1038 // Constant pool structure for invoke methods: 1039 enum { 1040 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1041 _imcp_invoke_signature, // utf8: (variable Symbol*) 1042 _imcp_limit 1043 }; 1044 1045 // Test if this method is an MH adapter frame generated by Java code. 1046 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1047 bool Method::is_compiled_lambda_form() const { 1048 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1049 } 1050 1051 // Test if this method is an internal MH primitive method. 1052 bool Method::is_method_handle_intrinsic() const { 1053 vmIntrinsics::ID iid = intrinsic_id(); 1054 return (MethodHandles::is_signature_polymorphic(iid) && 1055 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1056 } 1057 1058 bool Method::has_member_arg() const { 1059 vmIntrinsics::ID iid = intrinsic_id(); 1060 return (MethodHandles::is_signature_polymorphic(iid) && 1061 MethodHandles::has_member_arg(iid)); 1062 } 1063 1064 // Make an instance of a signature-polymorphic internal MH primitive. 1065 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1066 Symbol* signature, 1067 TRAPS) { 1068 ResourceMark rm; 1069 methodHandle empty; 1070 1071 KlassHandle holder = SystemDictionary::MethodHandle_klass(); 1072 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1073 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1074 if (TraceMethodHandles) { 1075 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1076 } 1077 1078 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1079 name->increment_refcount(); 1080 signature->increment_refcount(); 1081 1082 int cp_length = _imcp_limit; 1083 ClassLoaderData* loader_data = holder->class_loader_data(); 1084 constantPoolHandle cp; 1085 { 1086 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1087 cp = constantPoolHandle(THREAD, cp_oop); 1088 } 1089 cp->set_pool_holder(InstanceKlass::cast(holder())); 1090 cp->symbol_at_put(_imcp_invoke_name, name); 1091 cp->symbol_at_put(_imcp_invoke_signature, signature); 1092 cp->set_has_preresolution(); 1093 1094 // decide on access bits: public or not? 1095 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1096 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1097 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1098 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1099 1100 methodHandle m; 1101 { 1102 InlineTableSizes sizes; 1103 Method* m_oop = Method::allocate(loader_data, 0, 1104 accessFlags_from(flags_bits), &sizes, 1105 ConstMethod::NORMAL, CHECK_(empty)); 1106 m = methodHandle(THREAD, m_oop); 1107 } 1108 m->set_constants(cp()); 1109 m->set_name_index(_imcp_invoke_name); 1110 m->set_signature_index(_imcp_invoke_signature); 1111 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1112 assert(m->signature() == signature, ""); 1113 #ifdef CC_INTERP 1114 ResultTypeFinder rtf(signature); 1115 m->set_result_index(rtf.type()); 1116 #endif 1117 m->compute_size_of_parameters(THREAD); 1118 m->init_intrinsic_id(); 1119 assert(m->is_method_handle_intrinsic(), ""); 1120 #ifdef ASSERT 1121 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1122 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1123 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1124 #endif //ASSERT 1125 1126 // Finally, set up its entry points. 1127 assert(m->can_be_statically_bound(), ""); 1128 m->set_vtable_index(Method::nonvirtual_vtable_index); 1129 m->link_method(m, CHECK_(empty)); 1130 1131 if (TraceMethodHandles && (Verbose || WizardMode)) 1132 m->print_on(tty); 1133 1134 return m; 1135 } 1136 1137 Klass* Method::check_non_bcp_klass(Klass* klass) { 1138 if (klass != NULL && klass->class_loader() != NULL) { 1139 if (klass->oop_is_objArray()) 1140 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1141 return klass; 1142 } 1143 return NULL; 1144 } 1145 1146 1147 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1148 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1149 // Code below does not work for native methods - they should never get rewritten anyway 1150 assert(!m->is_native(), "cannot rewrite native methods"); 1151 // Allocate new Method* 1152 AccessFlags flags = m->access_flags(); 1153 1154 ConstMethod* cm = m->constMethod(); 1155 int checked_exceptions_len = cm->checked_exceptions_length(); 1156 int localvariable_len = cm->localvariable_table_length(); 1157 int exception_table_len = cm->exception_table_length(); 1158 int method_parameters_len = cm->method_parameters_length(); 1159 int method_annotations_len = cm->method_annotations_length(); 1160 int parameter_annotations_len = cm->parameter_annotations_length(); 1161 int type_annotations_len = cm->type_annotations_length(); 1162 int default_annotations_len = cm->default_annotations_length(); 1163 1164 InlineTableSizes sizes( 1165 localvariable_len, 1166 new_compressed_linenumber_size, 1167 exception_table_len, 1168 checked_exceptions_len, 1169 method_parameters_len, 1170 cm->generic_signature_index(), 1171 method_annotations_len, 1172 parameter_annotations_len, 1173 type_annotations_len, 1174 default_annotations_len, 1175 0); 1176 1177 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1178 Method* newm_oop = Method::allocate(loader_data, 1179 new_code_length, 1180 flags, 1181 &sizes, 1182 m->method_type(), 1183 CHECK_(methodHandle())); 1184 methodHandle newm (THREAD, newm_oop); 1185 int new_method_size = newm->method_size(); 1186 1187 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1188 ConstMethod* newcm = newm->constMethod(); 1189 int new_const_method_size = newm->constMethod()->size(); 1190 1191 memcpy(newm(), m(), sizeof(Method)); 1192 1193 // Create shallow copy of ConstMethod. 1194 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1195 1196 // Reset correct method/const method, method size, and parameter info 1197 newm->set_constMethod(newcm); 1198 newm->constMethod()->set_code_size(new_code_length); 1199 newm->constMethod()->set_constMethod_size(new_const_method_size); 1200 newm->set_method_size(new_method_size); 1201 assert(newm->code_size() == new_code_length, "check"); 1202 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1203 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1204 assert(newm->exception_table_length() == exception_table_len, "check"); 1205 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1206 // Copy new byte codes 1207 memcpy(newm->code_base(), new_code, new_code_length); 1208 // Copy line number table 1209 if (new_compressed_linenumber_size > 0) { 1210 memcpy(newm->compressed_linenumber_table(), 1211 new_compressed_linenumber_table, 1212 new_compressed_linenumber_size); 1213 } 1214 // Copy method_parameters 1215 if (method_parameters_len > 0) { 1216 memcpy(newm->method_parameters_start(), 1217 m->method_parameters_start(), 1218 method_parameters_len * sizeof(MethodParametersElement)); 1219 } 1220 // Copy checked_exceptions 1221 if (checked_exceptions_len > 0) { 1222 memcpy(newm->checked_exceptions_start(), 1223 m->checked_exceptions_start(), 1224 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1225 } 1226 // Copy exception table 1227 if (exception_table_len > 0) { 1228 memcpy(newm->exception_table_start(), 1229 m->exception_table_start(), 1230 exception_table_len * sizeof(ExceptionTableElement)); 1231 } 1232 // Copy local variable number table 1233 if (localvariable_len > 0) { 1234 memcpy(newm->localvariable_table_start(), 1235 m->localvariable_table_start(), 1236 localvariable_len * sizeof(LocalVariableTableElement)); 1237 } 1238 // Copy stackmap table 1239 if (m->has_stackmap_table()) { 1240 int code_attribute_length = m->stackmap_data()->length(); 1241 Array<u1>* stackmap_data = 1242 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1243 memcpy((void*)stackmap_data->adr_at(0), 1244 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1245 newm->set_stackmap_data(stackmap_data); 1246 } 1247 1248 // copy annotations over to new method 1249 newcm->copy_annotations_from(cm); 1250 return newm; 1251 } 1252 1253 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) { 1254 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1255 // because we are not loading from core libraries 1256 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1257 // which does not use the class default class loader so we check for its loader here 1258 InstanceKlass* ik = InstanceKlass::cast(holder); 1259 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) { 1260 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1261 } 1262 1263 // see if the klass name is well-known: 1264 Symbol* klass_name = ik->name(); 1265 return vmSymbols::find_sid(klass_name); 1266 } 1267 1268 void Method::init_intrinsic_id() { 1269 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1270 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1271 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1272 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1273 1274 // the klass name is well-known: 1275 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1276 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1277 1278 // ditto for method and signature: 1279 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1280 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1281 && name_id == vmSymbols::NO_SID) 1282 return; 1283 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1284 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1285 && sig_id == vmSymbols::NO_SID) return; 1286 jshort flags = access_flags().as_short(); 1287 1288 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1289 if (id != vmIntrinsics::_none) { 1290 set_intrinsic_id(id); 1291 return; 1292 } 1293 1294 // A few slightly irregular cases: 1295 switch (klass_id) { 1296 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1297 // Second chance: check in regular Math. 1298 switch (name_id) { 1299 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1300 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1301 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1302 // pretend it is the corresponding method in the non-strict class: 1303 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1304 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1305 break; 1306 } 1307 break; 1308 1309 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. 1310 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1311 if (!is_native()) break; 1312 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1313 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1314 id = vmIntrinsics::_none; 1315 break; 1316 } 1317 1318 if (id != vmIntrinsics::_none) { 1319 // Set up its iid. It is an alias method. 1320 set_intrinsic_id(id); 1321 return; 1322 } 1323 } 1324 1325 // These two methods are static since a GC may move the Method 1326 bool Method::load_signature_classes(methodHandle m, TRAPS) { 1327 if (THREAD->is_Compiler_thread()) { 1328 // There is nothing useful this routine can do from within the Compile thread. 1329 // Hopefully, the signature contains only well-known classes. 1330 // We could scan for this and return true/false, but the caller won't care. 1331 return false; 1332 } 1333 bool sig_is_loaded = true; 1334 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1335 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1336 ResourceMark rm(THREAD); 1337 Symbol* signature = m->signature(); 1338 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1339 if (ss.is_object()) { 1340 Symbol* sym = ss.as_symbol(CHECK_(false)); 1341 Symbol* name = sym; 1342 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1343 protection_domain, THREAD); 1344 // We are loading classes eagerly. If a ClassNotFoundException or 1345 // a LinkageError was generated, be sure to ignore it. 1346 if (HAS_PENDING_EXCEPTION) { 1347 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1348 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1349 CLEAR_PENDING_EXCEPTION; 1350 } else { 1351 return false; 1352 } 1353 } 1354 if( klass == NULL) { sig_is_loaded = false; } 1355 } 1356 } 1357 return sig_is_loaded; 1358 } 1359 1360 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1361 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1362 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1363 ResourceMark rm(THREAD); 1364 Symbol* signature = m->signature(); 1365 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1366 if (ss.type() == T_OBJECT) { 1367 Symbol* name = ss.as_symbol_or_null(); 1368 if (name == NULL) return true; 1369 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1370 if (klass == NULL) return true; 1371 } 1372 } 1373 return false; 1374 } 1375 1376 // Exposed so field engineers can debug VM 1377 void Method::print_short_name(outputStream* st) { 1378 ResourceMark rm; 1379 #ifdef PRODUCT 1380 st->print(" %s::", method_holder()->external_name()); 1381 #else 1382 st->print(" %s::", method_holder()->internal_name()); 1383 #endif 1384 name()->print_symbol_on(st); 1385 if (WizardMode) signature()->print_symbol_on(st); 1386 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1387 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1388 } 1389 1390 // Comparer for sorting an object array containing 1391 // Method*s. 1392 static int method_comparator(Method* a, Method* b) { 1393 return a->name()->fast_compare(b->name()); 1394 } 1395 1396 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1397 // default_methods also uses this without the ordering for fast find_method 1398 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) { 1399 int length = methods->length(); 1400 if (length > 1) { 1401 { 1402 No_Safepoint_Verifier nsv; 1403 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); 1404 } 1405 // Reset method ordering 1406 if (set_idnums) { 1407 for (int i = 0; i < length; i++) { 1408 Method* m = methods->at(i); 1409 m->set_method_idnum(i); 1410 } 1411 } 1412 } 1413 } 1414 1415 //----------------------------------------------------------------------------------- 1416 // Non-product code unless JVM/TI needs it 1417 1418 #if !defined(PRODUCT) || INCLUDE_JVMTI 1419 class SignatureTypePrinter : public SignatureTypeNames { 1420 private: 1421 outputStream* _st; 1422 bool _use_separator; 1423 1424 void type_name(const char* name) { 1425 if (_use_separator) _st->print(", "); 1426 _st->print("%s", name); 1427 _use_separator = true; 1428 } 1429 1430 public: 1431 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1432 _st = st; 1433 _use_separator = false; 1434 } 1435 1436 void print_parameters() { _use_separator = false; iterate_parameters(); } 1437 void print_returntype() { _use_separator = false; iterate_returntype(); } 1438 }; 1439 1440 1441 void Method::print_name(outputStream* st) { 1442 Thread *thread = Thread::current(); 1443 ResourceMark rm(thread); 1444 SignatureTypePrinter sig(signature(), st); 1445 st->print("%s ", is_static() ? "static" : "virtual"); 1446 sig.print_returntype(); 1447 st->print(" %s.", method_holder()->internal_name()); 1448 name()->print_symbol_on(st); 1449 st->print("("); 1450 sig.print_parameters(); 1451 st->print(")"); 1452 } 1453 #endif // !PRODUCT || INCLUDE_JVMTI 1454 1455 1456 void Method::print_codes_on(outputStream* st) const { 1457 print_codes_on(0, code_size(), st); 1458 } 1459 1460 void Method::print_codes_on(int from, int to, outputStream* st) const { 1461 Thread *thread = Thread::current(); 1462 ResourceMark rm(thread); 1463 methodHandle mh (thread, (Method*)this); 1464 BytecodeStream s(mh); 1465 s.set_interval(from, to); 1466 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1467 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1468 } 1469 1470 1471 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1472 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1473 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1474 // as end-of-stream terminator. 1475 1476 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1477 // bci and line number does not compress into single byte. 1478 // Write out escape character and use regular compression for bci and line number. 1479 write_byte((jubyte)0xFF); 1480 write_signed_int(bci_delta); 1481 write_signed_int(line_delta); 1482 } 1483 1484 // See comment in method.hpp which explains why this exists. 1485 #if defined(_M_AMD64) && _MSC_VER >= 1400 1486 #pragma optimize("", off) 1487 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1488 write_pair_inline(bci, line); 1489 } 1490 #pragma optimize("", on) 1491 #endif 1492 1493 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1494 _bci = 0; 1495 _line = 0; 1496 }; 1497 1498 1499 bool CompressedLineNumberReadStream::read_pair() { 1500 jubyte next = read_byte(); 1501 // Check for terminator 1502 if (next == 0) return false; 1503 if (next == 0xFF) { 1504 // Escape character, regular compression used 1505 _bci += read_signed_int(); 1506 _line += read_signed_int(); 1507 } else { 1508 // Single byte compression used 1509 _bci += next >> 3; 1510 _line += next & 0x7; 1511 } 1512 return true; 1513 } 1514 1515 1516 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1517 BreakpointInfo* bp = method_holder()->breakpoints(); 1518 for (; bp != NULL; bp = bp->next()) { 1519 if (bp->match(this, bci)) { 1520 return bp->orig_bytecode(); 1521 } 1522 } 1523 { 1524 ResourceMark rm; 1525 fatal(err_msg("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci)); 1526 } 1527 return Bytecodes::_shouldnotreachhere; 1528 } 1529 1530 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1531 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1532 BreakpointInfo* bp = method_holder()->breakpoints(); 1533 for (; bp != NULL; bp = bp->next()) { 1534 if (bp->match(this, bci)) { 1535 bp->set_orig_bytecode(code); 1536 // and continue, in case there is more than one 1537 } 1538 } 1539 } 1540 1541 void Method::set_breakpoint(int bci) { 1542 InstanceKlass* ik = method_holder(); 1543 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1544 bp->set_next(ik->breakpoints()); 1545 ik->set_breakpoints(bp); 1546 // do this last: 1547 bp->set(this); 1548 } 1549 1550 static void clear_matches(Method* m, int bci) { 1551 InstanceKlass* ik = m->method_holder(); 1552 BreakpointInfo* prev_bp = NULL; 1553 BreakpointInfo* next_bp; 1554 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1555 next_bp = bp->next(); 1556 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1557 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1558 // do this first: 1559 bp->clear(m); 1560 // unhook it 1561 if (prev_bp != NULL) 1562 prev_bp->set_next(next_bp); 1563 else 1564 ik->set_breakpoints(next_bp); 1565 delete bp; 1566 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1567 // at same location. So we have multiple matching (method_index and bci) 1568 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1569 // breakpoint for clear_breakpoint request and keep all other method versions 1570 // BreakpointInfo for future clear_breakpoint request. 1571 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1572 // which is being called when class is unloaded. We delete all the Breakpoint 1573 // information for all versions of method. We may not correctly restore the original 1574 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1575 // so these methods won't be used anymore. 1576 if (bci >= 0) { 1577 break; 1578 } 1579 } else { 1580 // This one is a keeper. 1581 prev_bp = bp; 1582 } 1583 } 1584 } 1585 1586 void Method::clear_breakpoint(int bci) { 1587 assert(bci >= 0, ""); 1588 clear_matches(this, bci); 1589 } 1590 1591 void Method::clear_all_breakpoints() { 1592 clear_matches(this, -1); 1593 } 1594 1595 1596 int Method::invocation_count() { 1597 MethodCounters *mcs = method_counters(); 1598 if (TieredCompilation) { 1599 MethodData* const mdo = method_data(); 1600 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1601 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1602 return InvocationCounter::count_limit; 1603 } else { 1604 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1605 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1606 } 1607 } else { 1608 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1609 } 1610 } 1611 1612 int Method::backedge_count() { 1613 MethodCounters *mcs = method_counters(); 1614 if (TieredCompilation) { 1615 MethodData* const mdo = method_data(); 1616 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1617 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1618 return InvocationCounter::count_limit; 1619 } else { 1620 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1621 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1622 } 1623 } else { 1624 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1625 } 1626 } 1627 1628 int Method::highest_comp_level() const { 1629 const MethodData* mdo = method_data(); 1630 if (mdo != NULL) { 1631 return mdo->highest_comp_level(); 1632 } else { 1633 return CompLevel_none; 1634 } 1635 } 1636 1637 int Method::highest_osr_comp_level() const { 1638 const MethodData* mdo = method_data(); 1639 if (mdo != NULL) { 1640 return mdo->highest_osr_comp_level(); 1641 } else { 1642 return CompLevel_none; 1643 } 1644 } 1645 1646 void Method::set_highest_comp_level(int level) { 1647 MethodData* mdo = method_data(); 1648 if (mdo != NULL) { 1649 mdo->set_highest_comp_level(level); 1650 } 1651 } 1652 1653 void Method::set_highest_osr_comp_level(int level) { 1654 MethodData* mdo = method_data(); 1655 if (mdo != NULL) { 1656 mdo->set_highest_osr_comp_level(level); 1657 } 1658 } 1659 1660 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1661 _bci = bci; 1662 _name_index = m->name_index(); 1663 _signature_index = m->signature_index(); 1664 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1665 if (_orig_bytecode == Bytecodes::_breakpoint) 1666 _orig_bytecode = m->orig_bytecode_at(_bci); 1667 _next = NULL; 1668 } 1669 1670 void BreakpointInfo::set(Method* method) { 1671 #ifdef ASSERT 1672 { 1673 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1674 if (code == Bytecodes::_breakpoint) 1675 code = method->orig_bytecode_at(_bci); 1676 assert(orig_bytecode() == code, "original bytecode must be the same"); 1677 } 1678 #endif 1679 Thread *thread = Thread::current(); 1680 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1681 method->incr_number_of_breakpoints(thread); 1682 SystemDictionary::notice_modification(); 1683 { 1684 // Deoptimize all dependents on this method 1685 HandleMark hm(thread); 1686 methodHandle mh(thread, method); 1687 Universe::flush_dependents_on_method(mh); 1688 } 1689 } 1690 1691 void BreakpointInfo::clear(Method* method) { 1692 *method->bcp_from(_bci) = orig_bytecode(); 1693 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1694 method->decr_number_of_breakpoints(Thread::current()); 1695 } 1696 1697 // jmethodID handling 1698 1699 // This is a block allocating object, sort of like JNIHandleBlock, only a 1700 // lot simpler. There aren't many of these, they aren't long, they are rarely 1701 // deleted and so we can do some suboptimal things. 1702 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1703 // never get rid of it. 1704 // It would be nice to be able to parameterize the number of methods for 1705 // the null_class_loader but then we'd have to turn this and ClassLoaderData 1706 // into templates. 1707 1708 // I feel like this brain dead class should exist somewhere in the STL 1709 1710 class JNIMethodBlock : public CHeapObj<mtClass> { 1711 enum { number_of_methods = 8 }; 1712 1713 Method* _methods[number_of_methods]; 1714 int _top; 1715 JNIMethodBlock* _next; 1716 public: 1717 static Method* const _free_method; 1718 1719 JNIMethodBlock() : _next(NULL), _top(0) { 1720 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method; 1721 } 1722 1723 Method** add_method(Method* m) { 1724 if (_top < number_of_methods) { 1725 // top points to the next free entry. 1726 int i = _top; 1727 _methods[i] = m; 1728 _top++; 1729 return &_methods[i]; 1730 } else if (_top == number_of_methods) { 1731 // if the next free entry ran off the block see if there's a free entry 1732 for (int i = 0; i< number_of_methods; i++) { 1733 if (_methods[i] == _free_method) { 1734 _methods[i] = m; 1735 return &_methods[i]; 1736 } 1737 } 1738 // Only check each block once for frees. They're very unlikely. 1739 // Increment top past the end of the block. 1740 _top++; 1741 } 1742 // need to allocate a next block. 1743 if (_next == NULL) { 1744 _next = new JNIMethodBlock(); 1745 } 1746 return _next->add_method(m); 1747 } 1748 1749 bool contains(Method** m) { 1750 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1751 for (int i = 0; i< number_of_methods; i++) { 1752 if (&(b->_methods[i]) == m) { 1753 return true; 1754 } 1755 } 1756 } 1757 return false; // not found 1758 } 1759 1760 // Doesn't really destroy it, just marks it as free so it can be reused. 1761 void destroy_method(Method** m) { 1762 #ifdef ASSERT 1763 assert(contains(m), "should be a methodID"); 1764 #endif // ASSERT 1765 *m = _free_method; 1766 } 1767 1768 // During class unloading the methods are cleared, which is different 1769 // than freed. 1770 void clear_all_methods() { 1771 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1772 for (int i = 0; i< number_of_methods; i++) { 1773 _methods[i] = NULL; 1774 } 1775 } 1776 } 1777 #ifndef PRODUCT 1778 int count_methods() { 1779 // count all allocated methods 1780 int count = 0; 1781 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1782 for (int i = 0; i< number_of_methods; i++) { 1783 if (_methods[i] != _free_method) count++; 1784 } 1785 } 1786 return count; 1787 } 1788 #endif // PRODUCT 1789 }; 1790 1791 // Something that can't be mistaken for an address or a markOop 1792 Method* const JNIMethodBlock::_free_method = (Method*)55; 1793 1794 // Add a method id to the jmethod_ids 1795 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 1796 ClassLoaderData* cld = loader_data; 1797 1798 if (!SafepointSynchronize::is_at_safepoint()) { 1799 // Have to add jmethod_ids() to class loader data thread-safely. 1800 // Also have to add the method to the list safely, which the cld lock 1801 // protects as well. 1802 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 1803 if (cld->jmethod_ids() == NULL) { 1804 cld->set_jmethod_ids(new JNIMethodBlock()); 1805 } 1806 // jmethodID is a pointer to Method* 1807 return (jmethodID)cld->jmethod_ids()->add_method(m); 1808 } else { 1809 // At safepoint, we are single threaded and can set this. 1810 if (cld->jmethod_ids() == NULL) { 1811 cld->set_jmethod_ids(new JNIMethodBlock()); 1812 } 1813 // jmethodID is a pointer to Method* 1814 return (jmethodID)cld->jmethod_ids()->add_method(m); 1815 } 1816 } 1817 1818 // Mark a jmethodID as free. This is called when there is a data race in 1819 // InstanceKlass while creating the jmethodID cache. 1820 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 1821 ClassLoaderData* cld = loader_data; 1822 Method** ptr = (Method**)m; 1823 assert(cld->jmethod_ids() != NULL, "should have method handles"); 1824 cld->jmethod_ids()->destroy_method(ptr); 1825 } 1826 1827 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 1828 // Can't assert the method_holder is the same because the new method has the 1829 // scratch method holder. 1830 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 1831 == new_method->method_holder()->class_loader(), 1832 "changing to a different class loader"); 1833 // Just change the method in place, jmethodID pointer doesn't change. 1834 *((Method**)jmid) = new_method; 1835 } 1836 1837 bool Method::is_method_id(jmethodID mid) { 1838 Method* m = resolve_jmethod_id(mid); 1839 assert(m != NULL, "should be called with non-null method"); 1840 InstanceKlass* ik = m->method_holder(); 1841 ClassLoaderData* cld = ik->class_loader_data(); 1842 if (cld->jmethod_ids() == NULL) return false; 1843 return (cld->jmethod_ids()->contains((Method**)mid)); 1844 } 1845 1846 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 1847 if (mid == NULL) return NULL; 1848 Method* o = resolve_jmethod_id(mid); 1849 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 1850 return NULL; 1851 } 1852 return o; 1853 }; 1854 1855 void Method::set_on_stack(const bool value) { 1856 // Set both the method itself and its constant pool. The constant pool 1857 // on stack means some method referring to it is also on the stack. 1858 _access_flags.set_on_stack(value); 1859 constants()->set_on_stack(value); 1860 if (value) MetadataOnStackMark::record(this); 1861 } 1862 1863 // Called when the class loader is unloaded to make all methods weak. 1864 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 1865 loader_data->jmethod_ids()->clear_all_methods(); 1866 } 1867 1868 bool Method::has_method_vptr(const void* ptr) { 1869 Method m; 1870 // This assumes that the vtbl pointer is the first word of a C++ object. 1871 // This assumption is also in universe.cpp patch_klass_vtble 1872 void* vtbl2 = dereference_vptr((const void*)&m); 1873 void* this_vtbl = dereference_vptr(ptr); 1874 return vtbl2 == this_vtbl; 1875 } 1876 1877 // Check that this pointer is valid by checking that the vtbl pointer matches 1878 bool Method::is_valid_method() const { 1879 if (this == NULL) { 1880 return false; 1881 } else if (!is_metaspace_object()) { 1882 return false; 1883 } else { 1884 return has_method_vptr((const void*)this); 1885 } 1886 } 1887 1888 #ifndef PRODUCT 1889 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 1890 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 1891 } 1892 #endif // PRODUCT 1893 1894 1895 // Printing 1896 1897 #ifndef PRODUCT 1898 1899 void Method::print_on(outputStream* st) const { 1900 ResourceMark rm; 1901 assert(is_method(), "must be method"); 1902 st->print_cr("%s", internal_name()); 1903 // get the effect of PrintOopAddress, always, for methods: 1904 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this); 1905 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 1906 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants()); 1907 constants()->print_value_on(st); st->cr(); 1908 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 1909 st->print (" - name: "); name()->print_value_on(st); st->cr(); 1910 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 1911 st->print_cr(" - max stack: %d", max_stack()); 1912 st->print_cr(" - max locals: %d", max_locals()); 1913 st->print_cr(" - size of params: %d", size_of_parameters()); 1914 st->print_cr(" - method size: %d", method_size()); 1915 if (intrinsic_id() != vmIntrinsics::_none) 1916 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 1917 if (highest_comp_level() != CompLevel_none) 1918 st->print_cr(" - highest level: %d", highest_comp_level()); 1919 st->print_cr(" - vtable index: %d", _vtable_index); 1920 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry()); 1921 st->print( " - adapters: "); 1922 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 1923 if (a == NULL) 1924 st->print_cr(INTPTR_FORMAT, a); 1925 else 1926 a->print_adapter_on(st); 1927 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry()); 1928 st->print_cr(" - code size: %d", code_size()); 1929 if (code_size() != 0) { 1930 st->print_cr(" - code start: " INTPTR_FORMAT, code_base()); 1931 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size()); 1932 } 1933 if (method_data() != NULL) { 1934 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data()); 1935 } 1936 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 1937 if (checked_exceptions_length() > 0) { 1938 CheckedExceptionElement* table = checked_exceptions_start(); 1939 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table); 1940 if (Verbose) { 1941 for (int i = 0; i < checked_exceptions_length(); i++) { 1942 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 1943 } 1944 } 1945 } 1946 if (has_linenumber_table()) { 1947 u_char* table = compressed_linenumber_table(); 1948 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table); 1949 if (Verbose) { 1950 CompressedLineNumberReadStream stream(table); 1951 while (stream.read_pair()) { 1952 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 1953 } 1954 } 1955 } 1956 st->print_cr(" - localvar length: %d", localvariable_table_length()); 1957 if (localvariable_table_length() > 0) { 1958 LocalVariableTableElement* table = localvariable_table_start(); 1959 st->print_cr(" - localvar start: " INTPTR_FORMAT, table); 1960 if (Verbose) { 1961 for (int i = 0; i < localvariable_table_length(); i++) { 1962 int bci = table[i].start_bci; 1963 int len = table[i].length; 1964 const char* name = constants()->printable_name_at(table[i].name_cp_index); 1965 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 1966 int slot = table[i].slot; 1967 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 1968 } 1969 } 1970 } 1971 if (code() != NULL) { 1972 st->print (" - compiled code: "); 1973 code()->print_value_on(st); 1974 } 1975 if (is_native()) { 1976 st->print_cr(" - native function: " INTPTR_FORMAT, native_function()); 1977 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler()); 1978 } 1979 } 1980 1981 #endif //PRODUCT 1982 1983 void Method::print_value_on(outputStream* st) const { 1984 assert(is_method(), "must be method"); 1985 st->print("%s", internal_name()); 1986 print_address_on(st); 1987 st->print(" "); 1988 name()->print_value_on(st); 1989 st->print(" "); 1990 signature()->print_value_on(st); 1991 st->print(" in "); 1992 method_holder()->print_value_on(st); 1993 if (WizardMode) st->print("#%d", _vtable_index); 1994 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 1995 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 1996 } 1997 1998 #if INCLUDE_SERVICES 1999 // Size Statistics 2000 void Method::collect_statistics(KlassSizeStats *sz) const { 2001 int mysize = sz->count(this); 2002 sz->_method_bytes += mysize; 2003 sz->_method_all_bytes += mysize; 2004 sz->_rw_bytes += mysize; 2005 2006 if (constMethod()) { 2007 constMethod()->collect_statistics(sz); 2008 } 2009 if (method_data()) { 2010 method_data()->collect_statistics(sz); 2011 } 2012 } 2013 #endif // INCLUDE_SERVICES 2014 2015 // Verification 2016 2017 void Method::verify_on(outputStream* st) { 2018 guarantee(is_method(), "object must be method"); 2019 guarantee(constants()->is_constantPool(), "should be constant pool"); 2020 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 2021 MethodData* md = method_data(); 2022 guarantee(md == NULL || 2023 md->is_methodData(), "should be method data"); 2024 }