1 /* 2 * Copyright (c) 1997, 2016, 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 set_intrinsic_id(vmIntrinsics::_none); 88 set_jfr_towrite(false); 89 set_force_inline(false); 90 set_hidden(false); 91 set_dont_inline(false); 92 set_has_injected_profile(false); 93 set_method_data(NULL); 94 clear_method_counters(); 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 clear_jmethod_id(loader_data); 114 MetadataFactory::free_metadata(loader_data, constMethod()); 115 set_constMethod(NULL); 116 MetadataFactory::free_metadata(loader_data, method_data()); 117 set_method_data(NULL); 118 MetadataFactory::free_metadata(loader_data, method_counters()); 119 clear_method_counters(); 120 // The nmethod will be gone when we get here. 121 if (code() != NULL) _code = NULL; 122 } 123 124 address Method::get_i2c_entry() { 125 assert(_adapter != NULL, "must have"); 126 return _adapter->get_i2c_entry(); 127 } 128 129 address Method::get_c2i_entry() { 130 assert(_adapter != NULL, "must have"); 131 return _adapter->get_c2i_entry(); 132 } 133 134 address Method::get_c2i_unverified_entry() { 135 assert(_adapter != NULL, "must have"); 136 return _adapter->get_c2i_unverified_entry(); 137 } 138 139 char* Method::name_and_sig_as_C_string() const { 140 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 141 } 142 143 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 144 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 145 } 146 147 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 148 const char* klass_name = klass->external_name(); 149 int klass_name_len = (int)strlen(klass_name); 150 int method_name_len = method_name->utf8_length(); 151 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 152 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 153 strcpy(dest, klass_name); 154 dest[klass_name_len] = '.'; 155 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 156 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 157 dest[len] = 0; 158 return dest; 159 } 160 161 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 162 Symbol* klass_name = klass->name(); 163 klass_name->as_klass_external_name(buf, size); 164 int len = (int)strlen(buf); 165 166 if (len < size - 1) { 167 buf[len++] = '.'; 168 169 method_name->as_C_string(&(buf[len]), size - len); 170 len = (int)strlen(buf); 171 172 signature->as_C_string(&(buf[len]), size - len); 173 } 174 175 return buf; 176 } 177 178 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) { 179 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 180 // access exception table 181 ExceptionTable table(mh()); 182 int length = table.length(); 183 // iterate through all entries sequentially 184 constantPoolHandle pool(THREAD, mh->constants()); 185 for (int i = 0; i < length; i ++) { 186 //reacquire the table in case a GC happened 187 ExceptionTable table(mh()); 188 int beg_bci = table.start_pc(i); 189 int end_bci = table.end_pc(i); 190 assert(beg_bci <= end_bci, "inconsistent exception table"); 191 if (beg_bci <= throw_bci && throw_bci < end_bci) { 192 // exception handler bci range covers throw_bci => investigate further 193 int handler_bci = table.handler_pc(i); 194 int klass_index = table.catch_type_index(i); 195 if (klass_index == 0) { 196 return handler_bci; 197 } else if (ex_klass.is_null()) { 198 return handler_bci; 199 } else { 200 // we know the exception class => get the constraint class 201 // this may require loading of the constraint class; if verification 202 // fails or some other exception occurs, return handler_bci 203 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); 204 KlassHandle klass = KlassHandle(THREAD, k); 205 assert(klass.not_null(), "klass not loaded"); 206 if (ex_klass->is_subtype_of(klass())) { 207 return handler_bci; 208 } 209 } 210 } 211 } 212 213 return -1; 214 } 215 216 void Method::mask_for(int bci, InterpreterOopMap* mask) { 217 218 Thread* myThread = Thread::current(); 219 methodHandle h_this(myThread, this); 220 #ifdef ASSERT 221 bool has_capability = myThread->is_VM_thread() || 222 myThread->is_ConcurrentGC_thread() || 223 myThread->is_GC_task_thread(); 224 225 if (!has_capability) { 226 if (!VerifyStack && !VerifyLastFrame) { 227 // verify stack calls this outside VM thread 228 warning("oopmap should only be accessed by the " 229 "VM, GC task or CMS threads (or during debugging)"); 230 InterpreterOopMap local_mask; 231 method_holder()->mask_for(h_this, bci, &local_mask); 232 local_mask.print(); 233 } 234 } 235 #endif 236 method_holder()->mask_for(h_this, bci, mask); 237 return; 238 } 239 240 241 int Method::bci_from(address bcp) const { 242 #ifdef ASSERT 243 { ResourceMark rm; 244 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), 245 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string())); 246 } 247 #endif 248 return bcp - code_base(); 249 } 250 251 252 // Return (int)bcx if it appears to be a valid BCI. 253 // Return bci_from((address)bcx) if it appears to be a valid BCP. 254 // Return -1 otherwise. 255 // Used by profiling code, when invalid data is a possibility. 256 // The caller is responsible for validating the Method* itself. 257 int Method::validate_bci_from_bcx(intptr_t bcx) const { 258 // keep bci as -1 if not a valid bci 259 int bci = -1; 260 if (bcx == 0 || (address)bcx == code_base()) { 261 // code_size() may return 0 and we allow 0 here 262 // the method may be native 263 bci = 0; 264 } else if (frame::is_bci(bcx)) { 265 if (bcx < code_size()) { 266 bci = (int)bcx; 267 } 268 } else if (contains((address)bcx)) { 269 bci = (address)bcx - code_base(); 270 } 271 // Assert that if we have dodged any asserts, bci is negative. 272 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 273 return bci; 274 } 275 276 address Method::bcp_from(int bci) const { 277 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), err_msg("illegal bci: %d", bci)); 278 address bcp = code_base() + bci; 279 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 280 return bcp; 281 } 282 283 284 int Method::size(bool is_native) { 285 // If native, then include pointers for native_function and signature_handler 286 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 287 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; 288 return align_object_size(header_size() + extra_words); 289 } 290 291 292 Symbol* Method::klass_name() const { 293 Klass* k = method_holder(); 294 assert(k->is_klass(), "must be klass"); 295 InstanceKlass* ik = (InstanceKlass*) k; 296 return ik->name(); 297 } 298 299 300 // Attempt to return method oop to original state. Clear any pointers 301 // (to objects outside the shared spaces). We won't be able to predict 302 // where they should point in a new JVM. Further initialize some 303 // entries now in order allow them to be write protected later. 304 305 void Method::remove_unshareable_info() { 306 unlink_method(); 307 } 308 309 310 bool Method::was_executed_more_than(int n) { 311 // Invocation counter is reset when the Method* is compiled. 312 // If the method has compiled code we therefore assume it has 313 // be excuted more than n times. 314 if (is_accessor() || is_empty_method() || (code() != NULL)) { 315 // interpreter doesn't bump invocation counter of trivial methods 316 // compiler does not bump invocation counter of compiled methods 317 return true; 318 } 319 else if ((method_counters() != NULL && 320 method_counters()->invocation_counter()->carry()) || 321 (method_data() != NULL && 322 method_data()->invocation_counter()->carry())) { 323 // The carry bit is set when the counter overflows and causes 324 // a compilation to occur. We don't know how many times 325 // the counter has been reset, so we simply assume it has 326 // been executed more than n times. 327 return true; 328 } else { 329 return invocation_count() > n; 330 } 331 } 332 333 #ifndef PRODUCT 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 method_holder()->name()->print_symbol_on(tty); 340 tty->print("."); 341 name()->print_symbol_on(tty); 342 signature()->print_symbol_on(tty); 343 344 if (WizardMode) { 345 // dump the size of the byte codes 346 tty->print(" {%d}", code_size()); 347 } 348 tty->cr(); 349 350 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 351 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 352 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 353 if (CountCompiledCalls) { 354 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 355 } 356 357 } 358 #endif 359 360 // Build a MethodData* object to hold information about this method 361 // collected in the interpreter. 362 void Method::build_interpreter_method_data(methodHandle method, TRAPS) { 363 // Do not profile method if current thread holds the pending list lock, 364 // which avoids deadlock for acquiring the MethodData_lock. 365 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) { 366 return; 367 } 368 369 // Grab a lock here to prevent multiple 370 // MethodData*s from being created. 371 MutexLocker ml(MethodData_lock, THREAD); 372 if (method->method_data() == NULL) { 373 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 374 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK); 375 method->set_method_data(method_data); 376 if (PrintMethodData && (Verbose || WizardMode)) { 377 ResourceMark rm(THREAD); 378 tty->print("build_interpreter_method_data for "); 379 method->print_name(tty); 380 tty->cr(); 381 // At the end of the run, the MDO, full of data, will be dumped. 382 } 383 } 384 } 385 386 MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 387 methodHandle mh(m); 388 ClassLoaderData* loader_data = mh->method_holder()->class_loader_data(); 389 MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL); 390 if (!mh->init_method_counters(counters)) { 391 MetadataFactory::free_metadata(loader_data, counters); 392 } 393 return mh->method_counters(); 394 } 395 396 void Method::cleanup_inline_caches() { 397 // The current system doesn't use inline caches in the interpreter 398 // => nothing to do (keep this method around for future use) 399 } 400 401 402 int Method::extra_stack_words() { 403 // not an inline function, to avoid a header dependency on Interpreter 404 return extra_stack_entries() * Interpreter::stackElementSize; 405 } 406 407 408 void Method::compute_size_of_parameters(Thread *thread) { 409 ArgumentSizeComputer asc(signature()); 410 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 411 } 412 413 BasicType Method::result_type() const { 414 ResultTypeFinder rtf(signature()); 415 return rtf.type(); 416 } 417 418 419 bool Method::is_empty_method() const { 420 return code_size() == 1 421 && *code_base() == Bytecodes::_return; 422 } 423 424 425 bool Method::is_vanilla_constructor() const { 426 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 427 // which only calls the superclass vanilla constructor and possibly does stores of 428 // zero constants to local fields: 429 // 430 // aload_0 431 // invokespecial 432 // indexbyte1 433 // indexbyte2 434 // 435 // followed by an (optional) sequence of: 436 // 437 // aload_0 438 // aconst_null / iconst_0 / fconst_0 / dconst_0 439 // putfield 440 // indexbyte1 441 // indexbyte2 442 // 443 // followed by: 444 // 445 // return 446 447 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 448 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 449 int size = code_size(); 450 // Check if size match 451 if (size == 0 || size % 5 != 0) return false; 452 address cb = code_base(); 453 int last = size - 1; 454 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 455 // Does not call superclass default constructor 456 return false; 457 } 458 // Check optional sequence 459 for (int i = 4; i < last; i += 5) { 460 if (cb[i] != Bytecodes::_aload_0) return false; 461 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 462 if (cb[i+2] != Bytecodes::_putfield) return false; 463 } 464 return true; 465 } 466 467 468 bool Method::compute_has_loops_flag() { 469 BytecodeStream bcs(this); 470 Bytecodes::Code bc; 471 472 while ((bc = bcs.next()) >= 0) { 473 switch( bc ) { 474 case Bytecodes::_ifeq: 475 case Bytecodes::_ifnull: 476 case Bytecodes::_iflt: 477 case Bytecodes::_ifle: 478 case Bytecodes::_ifne: 479 case Bytecodes::_ifnonnull: 480 case Bytecodes::_ifgt: 481 case Bytecodes::_ifge: 482 case Bytecodes::_if_icmpeq: 483 case Bytecodes::_if_icmpne: 484 case Bytecodes::_if_icmplt: 485 case Bytecodes::_if_icmpgt: 486 case Bytecodes::_if_icmple: 487 case Bytecodes::_if_icmpge: 488 case Bytecodes::_if_acmpeq: 489 case Bytecodes::_if_acmpne: 490 case Bytecodes::_goto: 491 case Bytecodes::_jsr: 492 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 493 break; 494 495 case Bytecodes::_goto_w: 496 case Bytecodes::_jsr_w: 497 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 498 break; 499 } 500 } 501 _access_flags.set_loops_flag_init(); 502 return _access_flags.has_loops(); 503 } 504 505 bool Method::is_final_method(AccessFlags class_access_flags) const { 506 // or "does_not_require_vtable_entry" 507 // default method or overpass can occur, is not final (reuses vtable entry) 508 // private methods get vtable entries for backward class compatibility. 509 if (is_overpass() || is_default_method()) return false; 510 return is_final() || class_access_flags.is_final(); 511 } 512 513 bool Method::is_final_method() const { 514 return is_final_method(method_holder()->access_flags()); 515 } 516 517 bool Method::is_default_method() const { 518 if (method_holder() != NULL && 519 method_holder()->is_interface() && 520 !is_abstract()) { 521 return true; 522 } else { 523 return false; 524 } 525 } 526 527 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 528 if (is_final_method(class_access_flags)) return true; 529 #ifdef ASSERT 530 ResourceMark rm; 531 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 532 if (class_access_flags.is_interface()) { 533 assert(is_nonv == is_static(), err_msg("is_nonv=%s", name_and_sig_as_C_string())); 534 } 535 #endif 536 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 537 return vtable_index() == nonvirtual_vtable_index; 538 } 539 540 bool Method::can_be_statically_bound() const { 541 return can_be_statically_bound(method_holder()->access_flags()); 542 } 543 544 bool Method::is_accessor() const { 545 if (code_size() != 5) return false; 546 if (size_of_parameters() != 1) return false; 547 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; 548 if (java_code_at(1) != Bytecodes::_getfield) return false; 549 if (java_code_at(4) != Bytecodes::_areturn && 550 java_code_at(4) != Bytecodes::_ireturn ) return false; 551 return true; 552 } 553 554 bool Method::is_constant_getter() const { 555 int last_index = code_size() - 1; 556 // Check if the first 1-3 bytecodes are a constant push 557 // and the last bytecode is a return. 558 return (2 <= code_size() && code_size() <= 4 && 559 Bytecodes::is_const(java_code_at(0)) && 560 Bytecodes::length_for(java_code_at(0)) == last_index && 561 Bytecodes::is_return(java_code_at(last_index))); 562 } 563 564 bool Method::is_initializer() const { 565 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); 566 } 567 568 bool Method::has_valid_initializer_flags() const { 569 return (is_static() || 570 method_holder()->major_version() < 51); 571 } 572 573 bool Method::is_static_initializer() const { 574 // For classfiles version 51 or greater, ensure that the clinit method is 575 // static. Non-static methods with the name "<clinit>" are not static 576 // initializers. (older classfiles exempted for backward compatibility) 577 return name() == vmSymbols::class_initializer_name() && 578 has_valid_initializer_flags(); 579 } 580 581 582 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) { 583 int length = this_oop->checked_exceptions_length(); 584 if (length == 0) { // common case 585 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 586 } else { 587 methodHandle h_this(THREAD, this_oop); 588 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 589 objArrayHandle mirrors (THREAD, m_oop); 590 for (int i = 0; i < length; i++) { 591 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 592 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 593 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 594 mirrors->obj_at_put(i, k->java_mirror()); 595 } 596 return mirrors; 597 } 598 }; 599 600 601 int Method::line_number_from_bci(int bci) const { 602 if (bci == SynchronizationEntryBCI) bci = 0; 603 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 604 int best_bci = 0; 605 int best_line = -1; 606 607 if (has_linenumber_table()) { 608 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 609 // Not necessarily sorted and not necessarily one-to-one. 610 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 611 while (stream.read_pair()) { 612 if (stream.bci() == bci) { 613 // perfect match 614 return stream.line(); 615 } else { 616 // update best_bci/line 617 if (stream.bci() < bci && stream.bci() >= best_bci) { 618 best_bci = stream.bci(); 619 best_line = stream.line(); 620 } 621 } 622 } 623 } 624 return best_line; 625 } 626 627 628 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 629 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 630 Thread *thread = Thread::current(); 631 Symbol* klass_name = constants()->klass_name_at(klass_index); 632 Handle loader(thread, method_holder()->class_loader()); 633 Handle prot (thread, method_holder()->protection_domain()); 634 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 635 } else { 636 return true; 637 } 638 } 639 640 641 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 642 int klass_index = constants()->klass_ref_index_at(refinfo_index); 643 if (must_be_resolved) { 644 // Make sure klass is resolved in constantpool. 645 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 646 } 647 return is_klass_loaded_by_klass_index(klass_index); 648 } 649 650 651 void Method::set_native_function(address function, bool post_event_flag) { 652 assert(function != NULL, "use clear_native_function to unregister natives"); 653 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 654 address* native_function = native_function_addr(); 655 656 // We can see racers trying to place the same native function into place. Once 657 // is plenty. 658 address current = *native_function; 659 if (current == function) return; 660 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 661 function != NULL) { 662 // native_method_throw_unsatisfied_link_error_entry() should only 663 // be passed when post_event_flag is false. 664 assert(function != 665 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 666 "post_event_flag mis-match"); 667 668 // post the bind event, and possible change the bind function 669 JvmtiExport::post_native_method_bind(this, &function); 670 } 671 *native_function = function; 672 // This function can be called more than once. We must make sure that we always 673 // use the latest registered method -> check if a stub already has been generated. 674 // If so, we have to make it not_entrant. 675 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 676 if (nm != NULL) { 677 nm->make_not_entrant(); 678 } 679 } 680 681 682 bool Method::has_native_function() const { 683 if (is_method_handle_intrinsic()) 684 return false; // special-cased in SharedRuntime::generate_native_wrapper 685 address func = native_function(); 686 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 687 } 688 689 690 void Method::clear_native_function() { 691 // Note: is_method_handle_intrinsic() is allowed here. 692 set_native_function( 693 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 694 !native_bind_event_is_interesting); 695 clear_code(); 696 } 697 698 address Method::critical_native_function() { 699 methodHandle mh(this); 700 return NativeLookup::lookup_critical_entry(mh); 701 } 702 703 704 void Method::set_signature_handler(address handler) { 705 address* signature_handler = signature_handler_addr(); 706 *signature_handler = handler; 707 } 708 709 710 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 711 if (PrintCompilation && report) { 712 ttyLocker ttyl; 713 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 714 if (comp_level == CompLevel_all) { 715 tty->print("all levels "); 716 } else { 717 tty->print("levels "); 718 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 719 tty->print("%d ", i); 720 } 721 } 722 this->print_short_name(tty); 723 int size = this->code_size(); 724 if (size > 0) { 725 tty->print(" (%d bytes)", size); 726 } 727 if (reason != NULL) { 728 tty->print(" %s", reason); 729 } 730 tty->cr(); 731 } 732 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 733 ttyLocker ttyl; 734 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 735 os::current_thread_id(), is_osr, comp_level); 736 if (reason != NULL) { 737 xtty->print(" reason=\'%s\'", reason); 738 } 739 xtty->method(this); 740 xtty->stamp(); 741 xtty->end_elem(); 742 } 743 } 744 745 bool Method::is_always_compilable() const { 746 // Generated adapters must be compiled 747 if (is_method_handle_intrinsic() && is_synthetic()) { 748 assert(!is_not_c1_compilable(), "sanity check"); 749 assert(!is_not_c2_compilable(), "sanity check"); 750 return true; 751 } 752 753 return false; 754 } 755 756 bool Method::is_not_compilable(int comp_level) const { 757 if (number_of_breakpoints() > 0) 758 return true; 759 if (is_always_compilable()) 760 return false; 761 if (comp_level == CompLevel_any) 762 return is_not_c1_compilable() || is_not_c2_compilable(); 763 if (is_c1_compile(comp_level)) 764 return is_not_c1_compilable(); 765 if (is_c2_compile(comp_level)) 766 return is_not_c2_compilable(); 767 return false; 768 } 769 770 // call this when compiler finds that this method is not compilable 771 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 772 if (is_always_compilable()) { 773 // Don't mark a method which should be always compilable 774 return; 775 } 776 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 777 if (comp_level == CompLevel_all) { 778 set_not_c1_compilable(); 779 set_not_c2_compilable(); 780 } else { 781 if (is_c1_compile(comp_level)) 782 set_not_c1_compilable(); 783 if (is_c2_compile(comp_level)) 784 set_not_c2_compilable(); 785 } 786 CompilationPolicy::policy()->disable_compilation(this); 787 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 788 } 789 790 bool Method::is_not_osr_compilable(int comp_level) const { 791 if (is_not_compilable(comp_level)) 792 return true; 793 if (comp_level == CompLevel_any) 794 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 795 if (is_c1_compile(comp_level)) 796 return is_not_c1_osr_compilable(); 797 if (is_c2_compile(comp_level)) 798 return is_not_c2_osr_compilable(); 799 return false; 800 } 801 802 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 803 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 804 if (comp_level == CompLevel_all) { 805 set_not_c1_osr_compilable(); 806 set_not_c2_osr_compilable(); 807 } else { 808 if (is_c1_compile(comp_level)) 809 set_not_c1_osr_compilable(); 810 if (is_c2_compile(comp_level)) 811 set_not_c2_osr_compilable(); 812 } 813 CompilationPolicy::policy()->disable_compilation(this); 814 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 815 } 816 817 // Revert to using the interpreter and clear out the nmethod 818 void Method::clear_code() { 819 820 // this may be NULL if c2i adapters have not been made yet 821 // Only should happen at allocate time. 822 if (_adapter == NULL) { 823 _from_compiled_entry = NULL; 824 } else { 825 _from_compiled_entry = _adapter->get_c2i_entry(); 826 } 827 OrderAccess::storestore(); 828 _from_interpreted_entry = _i2i_entry; 829 OrderAccess::storestore(); 830 _code = NULL; 831 } 832 833 // Called by class data sharing to remove any entry points (which are not shared) 834 void Method::unlink_method() { 835 _code = NULL; 836 _i2i_entry = NULL; 837 _from_interpreted_entry = NULL; 838 if (is_native()) { 839 *native_function_addr() = NULL; 840 set_signature_handler(NULL); 841 } 842 NOT_PRODUCT(set_compiled_invocation_count(0);) 843 _adapter = NULL; 844 _from_compiled_entry = NULL; 845 846 // In case of DumpSharedSpaces, _method_data should always be NULL. 847 // 848 // During runtime (!DumpSharedSpaces), when we are cleaning a 849 // shared class that failed to load, this->link_method() may 850 // have already been called (before an exception happened), so 851 // this->_method_data may not be NULL. 852 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?"); 853 854 set_method_data(NULL); 855 clear_method_counters(); 856 } 857 858 // Called when the method_holder is getting linked. Setup entrypoints so the method 859 // is ready to be called from interpreter, compiler, and vtables. 860 void Method::link_method(methodHandle h_method, TRAPS) { 861 // If the code cache is full, we may reenter this function for the 862 // leftover methods that weren't linked. 863 if (_i2i_entry != NULL) return; 864 865 assert(_adapter == NULL, "init'd to NULL" ); 866 assert( _code == NULL, "nothing compiled yet" ); 867 868 // Setup interpreter entrypoint 869 assert(this == h_method(), "wrong h_method()" ); 870 address entry = Interpreter::entry_for_method(h_method); 871 assert(entry != NULL, "interpreter entry must be non-null"); 872 // Sets both _i2i_entry and _from_interpreted_entry 873 set_interpreter_entry(entry); 874 875 // Don't overwrite already registered native entries. 876 if (is_native() && !has_native_function()) { 877 set_native_function( 878 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 879 !native_bind_event_is_interesting); 880 } 881 882 // Setup compiler entrypoint. This is made eagerly, so we do not need 883 // special handling of vtables. An alternative is to make adapters more 884 // lazily by calling make_adapter() from from_compiled_entry() for the 885 // normal calls. For vtable calls life gets more complicated. When a 886 // call-site goes mega-morphic we need adapters in all methods which can be 887 // called from the vtable. We need adapters on such methods that get loaded 888 // later. Ditto for mega-morphic itable calls. If this proves to be a 889 // problem we'll make these lazily later. 890 (void) make_adapters(h_method, CHECK); 891 892 // ONLY USE the h_method now as make_adapter may have blocked 893 894 } 895 896 address Method::make_adapters(methodHandle mh, TRAPS) { 897 // Adapters for compiled code are made eagerly here. They are fairly 898 // small (generally < 100 bytes) and quick to make (and cached and shared) 899 // so making them eagerly shouldn't be too expensive. 900 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 901 if (adapter == NULL ) { 902 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); 903 } 904 905 mh->set_adapter_entry(adapter); 906 mh->_from_compiled_entry = adapter->get_c2i_entry(); 907 return adapter->get_c2i_entry(); 908 } 909 910 void Method::restore_unshareable_info(TRAPS) { 911 // Since restore_unshareable_info can be called more than once for a method, don't 912 // redo any work. If this field is restored, there is nothing to do. 913 if (_from_compiled_entry == NULL) { 914 // restore method's vtable by calling a virtual function 915 restore_vtable(); 916 917 methodHandle mh(THREAD, this); 918 link_method(mh, CHECK); 919 } 920 } 921 922 923 // The verified_code_entry() must be called when a invoke is resolved 924 // on this method. 925 926 // It returns the compiled code entry point, after asserting not null. 927 // This function is called after potential safepoints so that nmethod 928 // or adapter that it points to is still live and valid. 929 // This function must not hit a safepoint! 930 address Method::verified_code_entry() { 931 debug_only(No_Safepoint_Verifier nsv;) 932 assert(_from_compiled_entry != NULL, "must be set"); 933 return _from_compiled_entry; 934 } 935 936 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 937 // (could be racing a deopt). 938 // Not inline to avoid circular ref. 939 bool Method::check_code() const { 940 // cached in a register or local. There's a race on the value of the field. 941 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 942 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 943 } 944 945 // Install compiled code. Instantly it can execute. 946 void Method::set_code(methodHandle mh, nmethod *code) { 947 assert( code, "use clear_code to remove code" ); 948 assert( mh->check_code(), "" ); 949 950 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 951 952 // These writes must happen in this order, because the interpreter will 953 // directly jump to from_interpreted_entry which jumps to an i2c adapter 954 // which jumps to _from_compiled_entry. 955 mh->_code = code; // Assign before allowing compiled code to exec 956 957 int comp_level = code->comp_level(); 958 // In theory there could be a race here. In practice it is unlikely 959 // and not worth worrying about. 960 if (comp_level > mh->highest_comp_level()) { 961 mh->set_highest_comp_level(comp_level); 962 } 963 964 OrderAccess::storestore(); 965 #ifdef SHARK 966 mh->_from_interpreted_entry = code->insts_begin(); 967 #else //!SHARK 968 mh->_from_compiled_entry = code->verified_entry_point(); 969 OrderAccess::storestore(); 970 // Instantly compiled code can execute. 971 if (!mh->is_method_handle_intrinsic()) 972 mh->_from_interpreted_entry = mh->get_i2c_entry(); 973 #endif //!SHARK 974 } 975 976 977 bool Method::is_overridden_in(Klass* k) const { 978 InstanceKlass* ik = InstanceKlass::cast(k); 979 980 if (ik->is_interface()) return false; 981 982 // If method is an interface, we skip it - except if it 983 // is a miranda method 984 if (method_holder()->is_interface()) { 985 // Check that method is not a miranda method 986 if (ik->lookup_method(name(), signature()) == NULL) { 987 // No implementation exist - so miranda method 988 return false; 989 } 990 return true; 991 } 992 993 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 994 assert(ik->vtable() != NULL, "vtable should exist"); 995 if (!has_vtable_index()) { 996 return false; 997 } else { 998 Method* vt_m = ik->method_at_vtable(vtable_index()); 999 return vt_m != this; 1000 } 1001 } 1002 1003 1004 // give advice about whether this Method* should be cached or not 1005 bool Method::should_not_be_cached() const { 1006 if (is_old()) { 1007 // This method has been redefined. It is either EMCP or obsolete 1008 // and we don't want to cache it because that would pin the method 1009 // down and prevent it from being collectible if and when it 1010 // finishes executing. 1011 return true; 1012 } 1013 1014 // caching this method should be just fine 1015 return false; 1016 } 1017 1018 1019 /** 1020 * Returns true if this is one of the specially treated methods for 1021 * security related stack walks (like Reflection.getCallerClass). 1022 */ 1023 bool Method::is_ignored_by_security_stack_walk() const { 1024 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection; 1025 1026 if (intrinsic_id() == vmIntrinsics::_invoke) { 1027 // This is Method.invoke() -- ignore it 1028 return true; 1029 } 1030 if (use_new_reflection && 1031 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1032 // This is an auxilary frame -- ignore it 1033 return true; 1034 } 1035 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1036 // This is an internal adapter frame for method handles -- ignore it 1037 return true; 1038 } 1039 return false; 1040 } 1041 1042 1043 // Constant pool structure for invoke methods: 1044 enum { 1045 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1046 _imcp_invoke_signature, // utf8: (variable Symbol*) 1047 _imcp_limit 1048 }; 1049 1050 // Test if this method is an MH adapter frame generated by Java code. 1051 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1052 bool Method::is_compiled_lambda_form() const { 1053 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1054 } 1055 1056 // Test if this method is an internal MH primitive method. 1057 bool Method::is_method_handle_intrinsic() const { 1058 vmIntrinsics::ID iid = intrinsic_id(); 1059 return (MethodHandles::is_signature_polymorphic(iid) && 1060 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1061 } 1062 1063 bool Method::has_member_arg() const { 1064 vmIntrinsics::ID iid = intrinsic_id(); 1065 return (MethodHandles::is_signature_polymorphic(iid) && 1066 MethodHandles::has_member_arg(iid)); 1067 } 1068 1069 // Make an instance of a signature-polymorphic internal MH primitive. 1070 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1071 Symbol* signature, 1072 TRAPS) { 1073 ResourceMark rm; 1074 methodHandle empty; 1075 1076 KlassHandle holder = SystemDictionary::MethodHandle_klass(); 1077 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1078 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1079 if (TraceMethodHandles) { 1080 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1081 } 1082 1083 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1084 name->increment_refcount(); 1085 signature->increment_refcount(); 1086 1087 int cp_length = _imcp_limit; 1088 ClassLoaderData* loader_data = holder->class_loader_data(); 1089 constantPoolHandle cp; 1090 { 1091 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1092 cp = constantPoolHandle(THREAD, cp_oop); 1093 } 1094 cp->set_pool_holder(InstanceKlass::cast(holder())); 1095 cp->symbol_at_put(_imcp_invoke_name, name); 1096 cp->symbol_at_put(_imcp_invoke_signature, signature); 1097 cp->set_has_preresolution(); 1098 1099 // decide on access bits: public or not? 1100 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1101 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1102 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1103 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1104 1105 methodHandle m; 1106 { 1107 InlineTableSizes sizes; 1108 Method* m_oop = Method::allocate(loader_data, 0, 1109 accessFlags_from(flags_bits), &sizes, 1110 ConstMethod::NORMAL, CHECK_(empty)); 1111 m = methodHandle(THREAD, m_oop); 1112 } 1113 m->set_constants(cp()); 1114 m->set_name_index(_imcp_invoke_name); 1115 m->set_signature_index(_imcp_invoke_signature); 1116 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1117 assert(m->signature() == signature, ""); 1118 ResultTypeFinder rtf(signature); 1119 m->constMethod()->set_result_type(rtf.type()); 1120 m->compute_size_of_parameters(THREAD); 1121 m->init_intrinsic_id(); 1122 assert(m->is_method_handle_intrinsic(), ""); 1123 #ifdef ASSERT 1124 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1125 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1126 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1127 #endif //ASSERT 1128 1129 // Finally, set up its entry points. 1130 assert(m->can_be_statically_bound(), ""); 1131 m->set_vtable_index(Method::nonvirtual_vtable_index); 1132 m->link_method(m, CHECK_(empty)); 1133 1134 if (TraceMethodHandles && (Verbose || WizardMode)) 1135 m->print_on(tty); 1136 1137 return m; 1138 } 1139 1140 Klass* Method::check_non_bcp_klass(Klass* klass) { 1141 if (klass != NULL && klass->class_loader() != NULL) { 1142 if (klass->oop_is_objArray()) 1143 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1144 return klass; 1145 } 1146 return NULL; 1147 } 1148 1149 1150 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1151 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1152 // Code below does not work for native methods - they should never get rewritten anyway 1153 assert(!m->is_native(), "cannot rewrite native methods"); 1154 // Allocate new Method* 1155 AccessFlags flags = m->access_flags(); 1156 1157 ConstMethod* cm = m->constMethod(); 1158 int checked_exceptions_len = cm->checked_exceptions_length(); 1159 int localvariable_len = cm->localvariable_table_length(); 1160 int exception_table_len = cm->exception_table_length(); 1161 int method_parameters_len = cm->method_parameters_length(); 1162 int method_annotations_len = cm->method_annotations_length(); 1163 int parameter_annotations_len = cm->parameter_annotations_length(); 1164 int type_annotations_len = cm->type_annotations_length(); 1165 int default_annotations_len = cm->default_annotations_length(); 1166 1167 InlineTableSizes sizes( 1168 localvariable_len, 1169 new_compressed_linenumber_size, 1170 exception_table_len, 1171 checked_exceptions_len, 1172 method_parameters_len, 1173 cm->generic_signature_index(), 1174 method_annotations_len, 1175 parameter_annotations_len, 1176 type_annotations_len, 1177 default_annotations_len, 1178 0); 1179 1180 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1181 Method* newm_oop = Method::allocate(loader_data, 1182 new_code_length, 1183 flags, 1184 &sizes, 1185 m->method_type(), 1186 CHECK_(methodHandle())); 1187 methodHandle newm (THREAD, newm_oop); 1188 int new_method_size = newm->method_size(); 1189 1190 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1191 ConstMethod* newcm = newm->constMethod(); 1192 int new_const_method_size = newm->constMethod()->size(); 1193 1194 memcpy(newm(), m(), sizeof(Method)); 1195 1196 // Create shallow copy of ConstMethod. 1197 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1198 1199 // Reset correct method/const method, method size, and parameter info 1200 newm->set_constMethod(newcm); 1201 newm->constMethod()->set_code_size(new_code_length); 1202 newm->constMethod()->set_constMethod_size(new_const_method_size); 1203 newm->set_method_size(new_method_size); 1204 assert(newm->code_size() == new_code_length, "check"); 1205 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1206 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1207 assert(newm->exception_table_length() == exception_table_len, "check"); 1208 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1209 // Copy new byte codes 1210 memcpy(newm->code_base(), new_code, new_code_length); 1211 // Copy line number table 1212 if (new_compressed_linenumber_size > 0) { 1213 memcpy(newm->compressed_linenumber_table(), 1214 new_compressed_linenumber_table, 1215 new_compressed_linenumber_size); 1216 } 1217 // Copy method_parameters 1218 if (method_parameters_len > 0) { 1219 memcpy(newm->method_parameters_start(), 1220 m->method_parameters_start(), 1221 method_parameters_len * sizeof(MethodParametersElement)); 1222 } 1223 // Copy checked_exceptions 1224 if (checked_exceptions_len > 0) { 1225 memcpy(newm->checked_exceptions_start(), 1226 m->checked_exceptions_start(), 1227 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1228 } 1229 // Copy exception table 1230 if (exception_table_len > 0) { 1231 memcpy(newm->exception_table_start(), 1232 m->exception_table_start(), 1233 exception_table_len * sizeof(ExceptionTableElement)); 1234 } 1235 // Copy local variable number table 1236 if (localvariable_len > 0) { 1237 memcpy(newm->localvariable_table_start(), 1238 m->localvariable_table_start(), 1239 localvariable_len * sizeof(LocalVariableTableElement)); 1240 } 1241 // Copy stackmap table 1242 if (m->has_stackmap_table()) { 1243 int code_attribute_length = m->stackmap_data()->length(); 1244 Array<u1>* stackmap_data = 1245 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1246 memcpy((void*)stackmap_data->adr_at(0), 1247 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1248 newm->set_stackmap_data(stackmap_data); 1249 } 1250 1251 // copy annotations over to new method 1252 newcm->copy_annotations_from(cm); 1253 return newm; 1254 } 1255 1256 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) { 1257 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1258 // because we are not loading from core libraries 1259 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1260 // which does not use the class default class loader so we check for its loader here 1261 InstanceKlass* ik = InstanceKlass::cast(holder); 1262 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) { 1263 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1264 } 1265 1266 // see if the klass name is well-known: 1267 Symbol* klass_name = ik->name(); 1268 return vmSymbols::find_sid(klass_name); 1269 } 1270 1271 void Method::init_intrinsic_id() { 1272 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1273 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1274 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1275 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1276 1277 // the klass name is well-known: 1278 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1279 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1280 1281 // ditto for method and signature: 1282 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1283 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1284 && name_id == vmSymbols::NO_SID) 1285 return; 1286 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1287 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1288 && sig_id == vmSymbols::NO_SID) return; 1289 jshort flags = access_flags().as_short(); 1290 1291 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1292 if (id != vmIntrinsics::_none) { 1293 set_intrinsic_id(id); 1294 return; 1295 } 1296 1297 // A few slightly irregular cases: 1298 switch (klass_id) { 1299 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1300 // Second chance: check in regular Math. 1301 switch (name_id) { 1302 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1303 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1304 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1305 // pretend it is the corresponding method in the non-strict class: 1306 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1307 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1308 break; 1309 } 1310 break; 1311 1312 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. 1313 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1314 if (!is_native()) break; 1315 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1316 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1317 id = vmIntrinsics::_none; 1318 break; 1319 } 1320 1321 if (id != vmIntrinsics::_none) { 1322 // Set up its iid. It is an alias method. 1323 set_intrinsic_id(id); 1324 return; 1325 } 1326 } 1327 1328 // These two methods are static since a GC may move the Method 1329 bool Method::load_signature_classes(methodHandle m, TRAPS) { 1330 if (THREAD->is_Compiler_thread()) { 1331 // There is nothing useful this routine can do from within the Compile thread. 1332 // Hopefully, the signature contains only well-known classes. 1333 // We could scan for this and return true/false, but the caller won't care. 1334 return false; 1335 } 1336 bool sig_is_loaded = true; 1337 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1338 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1339 ResourceMark rm(THREAD); 1340 Symbol* signature = m->signature(); 1341 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1342 if (ss.is_object()) { 1343 Symbol* sym = ss.as_symbol(CHECK_(false)); 1344 Symbol* name = sym; 1345 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1346 protection_domain, THREAD); 1347 // We are loading classes eagerly. If a ClassNotFoundException or 1348 // a LinkageError was generated, be sure to ignore it. 1349 if (HAS_PENDING_EXCEPTION) { 1350 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1351 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1352 CLEAR_PENDING_EXCEPTION; 1353 } else { 1354 return false; 1355 } 1356 } 1357 if( klass == NULL) { sig_is_loaded = false; } 1358 } 1359 } 1360 return sig_is_loaded; 1361 } 1362 1363 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1364 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1365 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1366 ResourceMark rm(THREAD); 1367 Symbol* signature = m->signature(); 1368 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1369 if (ss.type() == T_OBJECT) { 1370 Symbol* name = ss.as_symbol_or_null(); 1371 if (name == NULL) return true; 1372 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1373 if (klass == NULL) return true; 1374 } 1375 } 1376 return false; 1377 } 1378 1379 // Exposed so field engineers can debug VM 1380 void Method::print_short_name(outputStream* st) { 1381 ResourceMark rm; 1382 #ifdef PRODUCT 1383 st->print(" %s::", method_holder()->external_name()); 1384 #else 1385 st->print(" %s::", method_holder()->internal_name()); 1386 #endif 1387 name()->print_symbol_on(st); 1388 if (WizardMode) signature()->print_symbol_on(st); 1389 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1390 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1391 } 1392 1393 // Comparer for sorting an object array containing 1394 // Method*s. 1395 static int method_comparator(Method* a, Method* b) { 1396 return a->name()->fast_compare(b->name()); 1397 } 1398 1399 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1400 // default_methods also uses this without the ordering for fast find_method 1401 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) { 1402 int length = methods->length(); 1403 if (length > 1) { 1404 { 1405 No_Safepoint_Verifier nsv; 1406 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); 1407 } 1408 // Reset method ordering 1409 if (set_idnums) { 1410 for (int i = 0; i < length; i++) { 1411 Method* m = methods->at(i); 1412 m->set_method_idnum(i); 1413 m->set_orig_method_idnum(i); 1414 } 1415 } 1416 } 1417 } 1418 1419 //----------------------------------------------------------------------------------- 1420 // Non-product code unless JVM/TI needs it 1421 1422 #if !defined(PRODUCT) || INCLUDE_JVMTI 1423 class SignatureTypePrinter : public SignatureTypeNames { 1424 private: 1425 outputStream* _st; 1426 bool _use_separator; 1427 1428 void type_name(const char* name) { 1429 if (_use_separator) _st->print(", "); 1430 _st->print("%s", name); 1431 _use_separator = true; 1432 } 1433 1434 public: 1435 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1436 _st = st; 1437 _use_separator = false; 1438 } 1439 1440 void print_parameters() { _use_separator = false; iterate_parameters(); } 1441 void print_returntype() { _use_separator = false; iterate_returntype(); } 1442 }; 1443 1444 1445 void Method::print_name(outputStream* st) { 1446 Thread *thread = Thread::current(); 1447 ResourceMark rm(thread); 1448 SignatureTypePrinter sig(signature(), st); 1449 st->print("%s ", is_static() ? "static" : "virtual"); 1450 sig.print_returntype(); 1451 st->print(" %s.", method_holder()->internal_name()); 1452 name()->print_symbol_on(st); 1453 st->print("("); 1454 sig.print_parameters(); 1455 st->print(")"); 1456 } 1457 #endif // !PRODUCT || INCLUDE_JVMTI 1458 1459 1460 //----------------------------------------------------------------------------------- 1461 // Non-product code 1462 1463 #ifndef PRODUCT 1464 void Method::print_codes_on(outputStream* st) const { 1465 print_codes_on(0, code_size(), st); 1466 } 1467 1468 void Method::print_codes_on(int from, int to, outputStream* st) const { 1469 Thread *thread = Thread::current(); 1470 ResourceMark rm(thread); 1471 methodHandle mh (thread, (Method*)this); 1472 BytecodeStream s(mh); 1473 s.set_interval(from, to); 1474 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1475 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1476 } 1477 #endif // not PRODUCT 1478 1479 1480 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1481 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1482 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1483 // as end-of-stream terminator. 1484 1485 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1486 // bci and line number does not compress into single byte. 1487 // Write out escape character and use regular compression for bci and line number. 1488 write_byte((jubyte)0xFF); 1489 write_signed_int(bci_delta); 1490 write_signed_int(line_delta); 1491 } 1492 1493 // See comment in method.hpp which explains why this exists. 1494 #if defined(_M_AMD64) && _MSC_VER >= 1400 1495 #pragma optimize("", off) 1496 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1497 write_pair_inline(bci, line); 1498 } 1499 #pragma optimize("", on) 1500 #endif 1501 1502 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1503 _bci = 0; 1504 _line = 0; 1505 }; 1506 1507 1508 bool CompressedLineNumberReadStream::read_pair() { 1509 jubyte next = read_byte(); 1510 // Check for terminator 1511 if (next == 0) return false; 1512 if (next == 0xFF) { 1513 // Escape character, regular compression used 1514 _bci += read_signed_int(); 1515 _line += read_signed_int(); 1516 } else { 1517 // Single byte compression used 1518 _bci += next >> 3; 1519 _line += next & 0x7; 1520 } 1521 return true; 1522 } 1523 1524 1525 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1526 BreakpointInfo* bp = method_holder()->breakpoints(); 1527 for (; bp != NULL; bp = bp->next()) { 1528 if (bp->match(this, bci)) { 1529 return bp->orig_bytecode(); 1530 } 1531 } 1532 { 1533 ResourceMark rm; 1534 fatal(err_msg("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci)); 1535 } 1536 return Bytecodes::_shouldnotreachhere; 1537 } 1538 1539 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1540 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1541 BreakpointInfo* bp = method_holder()->breakpoints(); 1542 for (; bp != NULL; bp = bp->next()) { 1543 if (bp->match(this, bci)) { 1544 bp->set_orig_bytecode(code); 1545 // and continue, in case there is more than one 1546 } 1547 } 1548 } 1549 1550 void Method::set_breakpoint(int bci) { 1551 InstanceKlass* ik = method_holder(); 1552 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1553 bp->set_next(ik->breakpoints()); 1554 ik->set_breakpoints(bp); 1555 // do this last: 1556 bp->set(this); 1557 } 1558 1559 static void clear_matches(Method* m, int bci) { 1560 InstanceKlass* ik = m->method_holder(); 1561 BreakpointInfo* prev_bp = NULL; 1562 BreakpointInfo* next_bp; 1563 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1564 next_bp = bp->next(); 1565 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1566 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1567 // do this first: 1568 bp->clear(m); 1569 // unhook it 1570 if (prev_bp != NULL) 1571 prev_bp->set_next(next_bp); 1572 else 1573 ik->set_breakpoints(next_bp); 1574 delete bp; 1575 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1576 // at same location. So we have multiple matching (method_index and bci) 1577 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1578 // breakpoint for clear_breakpoint request and keep all other method versions 1579 // BreakpointInfo for future clear_breakpoint request. 1580 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1581 // which is being called when class is unloaded. We delete all the Breakpoint 1582 // information for all versions of method. We may not correctly restore the original 1583 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1584 // so these methods won't be used anymore. 1585 if (bci >= 0) { 1586 break; 1587 } 1588 } else { 1589 // This one is a keeper. 1590 prev_bp = bp; 1591 } 1592 } 1593 } 1594 1595 void Method::clear_breakpoint(int bci) { 1596 assert(bci >= 0, ""); 1597 clear_matches(this, bci); 1598 } 1599 1600 void Method::clear_all_breakpoints() { 1601 clear_matches(this, -1); 1602 } 1603 1604 1605 int Method::invocation_count() { 1606 MethodCounters *mcs = method_counters(); 1607 if (TieredCompilation) { 1608 MethodData* const mdo = method_data(); 1609 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1610 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1611 return InvocationCounter::count_limit; 1612 } else { 1613 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1614 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1615 } 1616 } else { 1617 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1618 } 1619 } 1620 1621 int Method::backedge_count() { 1622 MethodCounters *mcs = method_counters(); 1623 if (TieredCompilation) { 1624 MethodData* const mdo = method_data(); 1625 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1626 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1627 return InvocationCounter::count_limit; 1628 } else { 1629 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1630 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1631 } 1632 } else { 1633 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1634 } 1635 } 1636 1637 int Method::highest_comp_level() const { 1638 const MethodCounters* mcs = method_counters(); 1639 if (mcs != NULL) { 1640 return mcs->highest_comp_level(); 1641 } else { 1642 return CompLevel_none; 1643 } 1644 } 1645 1646 int Method::highest_osr_comp_level() const { 1647 const MethodCounters* mcs = method_counters(); 1648 if (mcs != NULL) { 1649 return mcs->highest_osr_comp_level(); 1650 } else { 1651 return CompLevel_none; 1652 } 1653 } 1654 1655 void Method::set_highest_comp_level(int level) { 1656 MethodCounters* mcs = method_counters(); 1657 if (mcs != NULL) { 1658 mcs->set_highest_comp_level(level); 1659 } 1660 } 1661 1662 void Method::set_highest_osr_comp_level(int level) { 1663 MethodCounters* mcs = method_counters(); 1664 if (mcs != NULL) { 1665 mcs->set_highest_osr_comp_level(level); 1666 } 1667 } 1668 1669 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1670 _bci = bci; 1671 _name_index = m->name_index(); 1672 _signature_index = m->signature_index(); 1673 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1674 if (_orig_bytecode == Bytecodes::_breakpoint) 1675 _orig_bytecode = m->orig_bytecode_at(_bci); 1676 _next = NULL; 1677 } 1678 1679 void BreakpointInfo::set(Method* method) { 1680 #ifdef ASSERT 1681 { 1682 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1683 if (code == Bytecodes::_breakpoint) 1684 code = method->orig_bytecode_at(_bci); 1685 assert(orig_bytecode() == code, "original bytecode must be the same"); 1686 } 1687 #endif 1688 Thread *thread = Thread::current(); 1689 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1690 method->incr_number_of_breakpoints(thread); 1691 SystemDictionary::notice_modification(); 1692 { 1693 // Deoptimize all dependents on this method 1694 HandleMark hm(thread); 1695 methodHandle mh(thread, method); 1696 Universe::flush_dependents_on_method(mh); 1697 } 1698 } 1699 1700 void BreakpointInfo::clear(Method* method) { 1701 *method->bcp_from(_bci) = orig_bytecode(); 1702 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1703 method->decr_number_of_breakpoints(Thread::current()); 1704 } 1705 1706 // jmethodID handling 1707 1708 // This is a block allocating object, sort of like JNIHandleBlock, only a 1709 // lot simpler. There aren't many of these, they aren't long, they are rarely 1710 // deleted and so we can do some suboptimal things. 1711 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1712 // never get rid of it. 1713 // It would be nice to be able to parameterize the number of methods for 1714 // the null_class_loader but then we'd have to turn this and ClassLoaderData 1715 // into templates. 1716 1717 // I feel like this brain dead class should exist somewhere in the STL 1718 1719 class JNIMethodBlock : public CHeapObj<mtClass> { 1720 enum { number_of_methods = 8 }; 1721 1722 Method* _methods[number_of_methods]; 1723 int _top; 1724 JNIMethodBlock* _next; 1725 public: 1726 static Method* const _free_method; 1727 1728 JNIMethodBlock() : _next(NULL), _top(0) { 1729 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method; 1730 } 1731 1732 Method** add_method(Method* m) { 1733 if (_top < number_of_methods) { 1734 // top points to the next free entry. 1735 int i = _top; 1736 _methods[i] = m; 1737 _top++; 1738 return &_methods[i]; 1739 } else if (_top == number_of_methods) { 1740 // if the next free entry ran off the block see if there's a free entry 1741 for (int i = 0; i< number_of_methods; i++) { 1742 if (_methods[i] == _free_method) { 1743 _methods[i] = m; 1744 return &_methods[i]; 1745 } 1746 } 1747 // Only check each block once for frees. They're very unlikely. 1748 // Increment top past the end of the block. 1749 _top++; 1750 } 1751 // need to allocate a next block. 1752 if (_next == NULL) { 1753 _next = new JNIMethodBlock(); 1754 } 1755 return _next->add_method(m); 1756 } 1757 1758 bool contains(Method** m) { 1759 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1760 for (int i = 0; i< number_of_methods; i++) { 1761 if (&(b->_methods[i]) == m) { 1762 return true; 1763 } 1764 } 1765 } 1766 return false; // not found 1767 } 1768 1769 // Doesn't really destroy it, just marks it as free so it can be reused. 1770 void destroy_method(Method** m) { 1771 #ifdef ASSERT 1772 assert(contains(m), "should be a methodID"); 1773 #endif // ASSERT 1774 *m = _free_method; 1775 } 1776 void clear_method(Method* m) { 1777 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1778 for (int i = 0; i< number_of_methods; i++) { 1779 if (b->_methods[i] == m) { 1780 b->_methods[i] = NULL; 1781 } 1782 } 1783 } 1784 // not found 1785 } 1786 1787 // During class unloading the methods are cleared, which is different 1788 // than freed. 1789 void clear_all_methods() { 1790 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1791 for (int i = 0; i< number_of_methods; i++) { 1792 b->_methods[i] = NULL; 1793 } 1794 } 1795 } 1796 #ifndef PRODUCT 1797 int count_methods() { 1798 // count all allocated methods 1799 int count = 0; 1800 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1801 for (int i = 0; i< number_of_methods; i++) { 1802 if (b->_methods[i] != _free_method) count++; 1803 } 1804 } 1805 return count; 1806 } 1807 #endif // PRODUCT 1808 }; 1809 1810 // Something that can't be mistaken for an address or a markOop 1811 Method* const JNIMethodBlock::_free_method = (Method*)55; 1812 1813 // Add a method id to the jmethod_ids 1814 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 1815 ClassLoaderData* cld = loader_data; 1816 1817 if (!SafepointSynchronize::is_at_safepoint()) { 1818 // Have to add jmethod_ids() to class loader data thread-safely. 1819 // Also have to add the method to the list safely, which the cld lock 1820 // protects as well. 1821 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 1822 if (cld->jmethod_ids() == NULL) { 1823 cld->set_jmethod_ids(new JNIMethodBlock()); 1824 } 1825 // jmethodID is a pointer to Method* 1826 return (jmethodID)cld->jmethod_ids()->add_method(m); 1827 } else { 1828 // At safepoint, we are single threaded and can set this. 1829 if (cld->jmethod_ids() == NULL) { 1830 cld->set_jmethod_ids(new JNIMethodBlock()); 1831 } 1832 // jmethodID is a pointer to Method* 1833 return (jmethodID)cld->jmethod_ids()->add_method(m); 1834 } 1835 } 1836 1837 // Mark a jmethodID as free. This is called when there is a data race in 1838 // InstanceKlass while creating the jmethodID cache. 1839 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 1840 ClassLoaderData* cld = loader_data; 1841 Method** ptr = (Method**)m; 1842 assert(cld->jmethod_ids() != NULL, "should have method handles"); 1843 cld->jmethod_ids()->destroy_method(ptr); 1844 } 1845 1846 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 1847 // Can't assert the method_holder is the same because the new method has the 1848 // scratch method holder. 1849 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 1850 == new_method->method_holder()->class_loader(), 1851 "changing to a different class loader"); 1852 // Just change the method in place, jmethodID pointer doesn't change. 1853 *((Method**)jmid) = new_method; 1854 } 1855 1856 bool Method::is_method_id(jmethodID mid) { 1857 Method* m = resolve_jmethod_id(mid); 1858 if (m == NULL) { 1859 return false; 1860 } 1861 InstanceKlass* ik = m->method_holder(); 1862 if (ik == NULL) { 1863 return false; 1864 } 1865 ClassLoaderData* cld = ik->class_loader_data(); 1866 if (cld->jmethod_ids() == NULL) return false; 1867 return (cld->jmethod_ids()->contains((Method**)mid)); 1868 } 1869 1870 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 1871 if (mid == NULL) return NULL; 1872 if (!Method::is_method_id(mid)) { 1873 return NULL; 1874 } 1875 Method* o = resolve_jmethod_id(mid); 1876 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 1877 return NULL; 1878 } 1879 return o; 1880 }; 1881 1882 void Method::clear_jmethod_id(ClassLoaderData* loader_data) { 1883 loader_data->jmethod_ids()->clear_method(this); 1884 } 1885 1886 void Method::set_on_stack(const bool value) { 1887 // Set both the method itself and its constant pool. The constant pool 1888 // on stack means some method referring to it is also on the stack. 1889 constants()->set_on_stack(value); 1890 1891 bool succeeded = _access_flags.set_on_stack(value); 1892 if (value && succeeded) { 1893 MetadataOnStackMark::record(this, Thread::current()); 1894 } 1895 } 1896 1897 // Called when the class loader is unloaded to make all methods weak. 1898 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 1899 loader_data->jmethod_ids()->clear_all_methods(); 1900 } 1901 1902 bool Method::has_method_vptr(const void* ptr) { 1903 Method m; 1904 // This assumes that the vtbl pointer is the first word of a C++ object. 1905 // This assumption is also in universe.cpp patch_klass_vtble 1906 void* vtbl2 = dereference_vptr((const void*)&m); 1907 void* this_vtbl = dereference_vptr(ptr); 1908 return vtbl2 == this_vtbl; 1909 } 1910 1911 // Check that this pointer is valid by checking that the vtbl pointer matches 1912 bool Method::is_valid_method() const { 1913 if (this == NULL) { 1914 return false; 1915 } else if (!is_metaspace_object()) { 1916 return false; 1917 } else { 1918 return has_method_vptr((const void*)this); 1919 } 1920 } 1921 1922 #ifndef PRODUCT 1923 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 1924 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 1925 } 1926 #endif // PRODUCT 1927 1928 1929 // Printing 1930 1931 #ifndef PRODUCT 1932 1933 void Method::print_on(outputStream* st) const { 1934 ResourceMark rm; 1935 assert(is_method(), "must be method"); 1936 st->print_cr("%s", internal_name()); 1937 // get the effect of PrintOopAddress, always, for methods: 1938 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this); 1939 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 1940 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants()); 1941 constants()->print_value_on(st); st->cr(); 1942 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 1943 st->print (" - name: "); name()->print_value_on(st); st->cr(); 1944 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 1945 st->print_cr(" - max stack: %d", max_stack()); 1946 st->print_cr(" - max locals: %d", max_locals()); 1947 st->print_cr(" - size of params: %d", size_of_parameters()); 1948 st->print_cr(" - method size: %d", method_size()); 1949 if (intrinsic_id() != vmIntrinsics::_none) 1950 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 1951 if (highest_comp_level() != CompLevel_none) 1952 st->print_cr(" - highest level: %d", highest_comp_level()); 1953 st->print_cr(" - vtable index: %d", _vtable_index); 1954 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry()); 1955 st->print( " - adapters: "); 1956 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 1957 if (a == NULL) 1958 st->print_cr(INTPTR_FORMAT, a); 1959 else 1960 a->print_adapter_on(st); 1961 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry()); 1962 st->print_cr(" - code size: %d", code_size()); 1963 if (code_size() != 0) { 1964 st->print_cr(" - code start: " INTPTR_FORMAT, code_base()); 1965 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size()); 1966 } 1967 if (method_data() != NULL) { 1968 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data()); 1969 } 1970 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 1971 if (checked_exceptions_length() > 0) { 1972 CheckedExceptionElement* table = checked_exceptions_start(); 1973 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table); 1974 if (Verbose) { 1975 for (int i = 0; i < checked_exceptions_length(); i++) { 1976 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 1977 } 1978 } 1979 } 1980 if (has_linenumber_table()) { 1981 u_char* table = compressed_linenumber_table(); 1982 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table); 1983 if (Verbose) { 1984 CompressedLineNumberReadStream stream(table); 1985 while (stream.read_pair()) { 1986 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 1987 } 1988 } 1989 } 1990 st->print_cr(" - localvar length: %d", localvariable_table_length()); 1991 if (localvariable_table_length() > 0) { 1992 LocalVariableTableElement* table = localvariable_table_start(); 1993 st->print_cr(" - localvar start: " INTPTR_FORMAT, table); 1994 if (Verbose) { 1995 for (int i = 0; i < localvariable_table_length(); i++) { 1996 int bci = table[i].start_bci; 1997 int len = table[i].length; 1998 const char* name = constants()->printable_name_at(table[i].name_cp_index); 1999 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2000 int slot = table[i].slot; 2001 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2002 } 2003 } 2004 } 2005 if (code() != NULL) { 2006 st->print (" - compiled code: "); 2007 code()->print_value_on(st); 2008 } 2009 if (is_native()) { 2010 st->print_cr(" - native function: " INTPTR_FORMAT, native_function()); 2011 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler()); 2012 } 2013 } 2014 2015 #endif //PRODUCT 2016 2017 void Method::print_value_on(outputStream* st) const { 2018 assert(is_method(), "must be method"); 2019 st->print("%s", internal_name()); 2020 print_address_on(st); 2021 st->print(" "); 2022 name()->print_value_on(st); 2023 st->print(" "); 2024 signature()->print_value_on(st); 2025 st->print(" in "); 2026 method_holder()->print_value_on(st); 2027 if (WizardMode) st->print("#%d", _vtable_index); 2028 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2029 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2030 } 2031 2032 #if INCLUDE_SERVICES 2033 // Size Statistics 2034 void Method::collect_statistics(KlassSizeStats *sz) const { 2035 int mysize = sz->count(this); 2036 sz->_method_bytes += mysize; 2037 sz->_method_all_bytes += mysize; 2038 sz->_rw_bytes += mysize; 2039 2040 if (constMethod()) { 2041 constMethod()->collect_statistics(sz); 2042 } 2043 if (method_data()) { 2044 method_data()->collect_statistics(sz); 2045 } 2046 } 2047 #endif // INCLUDE_SERVICES 2048 2049 // Verification 2050 2051 void Method::verify_on(outputStream* st) { 2052 guarantee(is_method(), "object must be method"); 2053 guarantee(constants()->is_constantPool(), "should be constant pool"); 2054 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 2055 MethodData* md = method_data(); 2056 guarantee(md == NULL || 2057 md->is_methodData(), "should be method data"); 2058 }