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/metaspaceShared.hpp" 40 #include "memory/oopFactory.hpp" 41 #include "oops/constMethod.hpp" 42 #include "oops/methodData.hpp" 43 #include "oops/method.hpp" 44 #include "oops/oop.inline.hpp" 45 #include "oops/symbol.hpp" 46 #include "prims/jvmtiExport.hpp" 47 #include "prims/methodHandles.hpp" 48 #include "prims/nativeLookup.hpp" 49 #include "runtime/arguments.hpp" 50 #include "runtime/compilationPolicy.hpp" 51 #include "runtime/frame.inline.hpp" 52 #include "runtime/handles.inline.hpp" 53 #include "runtime/orderAccess.inline.hpp" 54 #include "runtime/relocator.hpp" 55 #include "runtime/sharedRuntime.hpp" 56 #include "runtime/signature.hpp" 57 #include "utilities/quickSort.hpp" 58 #include "utilities/xmlstream.hpp" 59 60 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 61 62 // Implementation of Method 63 64 Method* Method::allocate(ClassLoaderData* loader_data, 65 int byte_code_size, 66 AccessFlags access_flags, 67 InlineTableSizes* sizes, 68 ConstMethod::MethodType method_type, 69 TRAPS) { 70 assert(!access_flags.is_native() || byte_code_size == 0, 71 "native methods should not contain byte codes"); 72 ConstMethod* cm = ConstMethod::allocate(loader_data, 73 byte_code_size, 74 sizes, 75 method_type, 76 CHECK_NULL); 77 78 int size = Method::size(access_flags.is_native()); 79 80 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, size); 81 } 82 83 Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) { 84 No_Safepoint_Verifier no_safepoint; 85 set_constMethod(xconst); 86 set_access_flags(access_flags); 87 set_method_size(size); 88 set_intrinsic_id(vmIntrinsics::_none); 89 set_jfr_towrite(false); 90 set_force_inline(false); 91 set_hidden(false); 92 set_dont_inline(false); 93 set_has_injected_profile(false); 94 set_method_data(NULL); 95 clear_method_counters(); 96 set_vtable_index(Method::garbage_vtable_index); 97 98 // Fix and bury in Method* 99 set_interpreter_entry(NULL); // sets i2i entry and from_int 100 set_adapter_entry(NULL); 101 clear_code(); // from_c/from_i get set to c2i/i2i 102 103 if (access_flags.is_native()) { 104 clear_native_function(); 105 set_signature_handler(NULL); 106 } 107 108 NOT_PRODUCT(set_compiled_invocation_count(0);) 109 } 110 111 // Release Method*. The nmethod will be gone when we get here because 112 // we've walked the code cache. 113 void Method::deallocate_contents(ClassLoaderData* loader_data) { 114 clear_jmethod_id(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 clear_method_counters(); 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 void Method::set_vtable_index(int index) { 311 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 312 // At runtime initialize_vtable is rerun as part of link_class_impl() 313 // for a shared class loaded by the non-boot loader to obtain the loader 314 // constraints based on the runtime classloaders' context. 315 return; // don't write into the shared class 316 } else { 317 _vtable_index = index; 318 } 319 } 320 321 void Method::set_itable_index(int index) { 322 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 323 // At runtime initialize_itable is rerun as part of link_class_impl() 324 // for a shared class loaded by the non-boot loader to obtain the loader 325 // constraints based on the runtime classloaders' context. The dumptime 326 // itable index should be the same as the runtime index. 327 assert(_vtable_index == itable_index_max - index, 328 "archived itable index is different from runtime index"); 329 return; // don’t write into the shared class 330 } else { 331 _vtable_index = itable_index_max - index; 332 } 333 assert(valid_itable_index(), ""); 334 } 335 336 337 338 bool Method::was_executed_more_than(int n) { 339 // Invocation counter is reset when the Method* is compiled. 340 // If the method has compiled code we therefore assume it has 341 // be excuted more than n times. 342 if (is_accessor() || is_empty_method() || (code() != NULL)) { 343 // interpreter doesn't bump invocation counter of trivial methods 344 // compiler does not bump invocation counter of compiled methods 345 return true; 346 } 347 else if ((method_counters() != NULL && 348 method_counters()->invocation_counter()->carry()) || 349 (method_data() != NULL && 350 method_data()->invocation_counter()->carry())) { 351 // The carry bit is set when the counter overflows and causes 352 // a compilation to occur. We don't know how many times 353 // the counter has been reset, so we simply assume it has 354 // been executed more than n times. 355 return true; 356 } else { 357 return invocation_count() > n; 358 } 359 } 360 361 #ifndef PRODUCT 362 void Method::print_invocation_count() { 363 if (is_static()) tty->print("static "); 364 if (is_final()) tty->print("final "); 365 if (is_synchronized()) tty->print("synchronized "); 366 if (is_native()) tty->print("native "); 367 method_holder()->name()->print_symbol_on(tty); 368 tty->print("."); 369 name()->print_symbol_on(tty); 370 signature()->print_symbol_on(tty); 371 372 if (WizardMode) { 373 // dump the size of the byte codes 374 tty->print(" {%d}", code_size()); 375 } 376 tty->cr(); 377 378 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 379 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 380 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 381 if (CountCompiledCalls) { 382 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 383 } 384 385 } 386 #endif 387 388 // Build a MethodData* object to hold information about this method 389 // collected in the interpreter. 390 void Method::build_interpreter_method_data(methodHandle method, TRAPS) { 391 // Do not profile method if current thread holds the pending list lock, 392 // which avoids deadlock for acquiring the MethodData_lock. 393 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) { 394 return; 395 } 396 397 // Grab a lock here to prevent multiple 398 // MethodData*s from being created. 399 MutexLocker ml(MethodData_lock, THREAD); 400 if (method->method_data() == NULL) { 401 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 402 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK); 403 method->set_method_data(method_data); 404 if (PrintMethodData && (Verbose || WizardMode)) { 405 ResourceMark rm(THREAD); 406 tty->print("build_interpreter_method_data for "); 407 method->print_name(tty); 408 tty->cr(); 409 // At the end of the run, the MDO, full of data, will be dumped. 410 } 411 } 412 } 413 414 MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 415 methodHandle mh(m); 416 ClassLoaderData* loader_data = mh->method_holder()->class_loader_data(); 417 MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL); 418 if (!mh->init_method_counters(counters)) { 419 MetadataFactory::free_metadata(loader_data, counters); 420 } 421 return mh->method_counters(); 422 } 423 424 void Method::cleanup_inline_caches() { 425 // The current system doesn't use inline caches in the interpreter 426 // => nothing to do (keep this method around for future use) 427 } 428 429 430 int Method::extra_stack_words() { 431 // not an inline function, to avoid a header dependency on Interpreter 432 return extra_stack_entries() * Interpreter::stackElementSize; 433 } 434 435 436 void Method::compute_size_of_parameters(Thread *thread) { 437 ArgumentSizeComputer asc(signature()); 438 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 439 } 440 441 BasicType Method::result_type() const { 442 ResultTypeFinder rtf(signature()); 443 return rtf.type(); 444 } 445 446 447 bool Method::is_empty_method() const { 448 return code_size() == 1 449 && *code_base() == Bytecodes::_return; 450 } 451 452 453 bool Method::is_vanilla_constructor() const { 454 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 455 // which only calls the superclass vanilla constructor and possibly does stores of 456 // zero constants to local fields: 457 // 458 // aload_0 459 // invokespecial 460 // indexbyte1 461 // indexbyte2 462 // 463 // followed by an (optional) sequence of: 464 // 465 // aload_0 466 // aconst_null / iconst_0 / fconst_0 / dconst_0 467 // putfield 468 // indexbyte1 469 // indexbyte2 470 // 471 // followed by: 472 // 473 // return 474 475 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 476 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 477 int size = code_size(); 478 // Check if size match 479 if (size == 0 || size % 5 != 0) return false; 480 address cb = code_base(); 481 int last = size - 1; 482 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 483 // Does not call superclass default constructor 484 return false; 485 } 486 // Check optional sequence 487 for (int i = 4; i < last; i += 5) { 488 if (cb[i] != Bytecodes::_aload_0) return false; 489 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 490 if (cb[i+2] != Bytecodes::_putfield) return false; 491 } 492 return true; 493 } 494 495 496 bool Method::compute_has_loops_flag() { 497 BytecodeStream bcs(this); 498 Bytecodes::Code bc; 499 500 while ((bc = bcs.next()) >= 0) { 501 switch( bc ) { 502 case Bytecodes::_ifeq: 503 case Bytecodes::_ifnull: 504 case Bytecodes::_iflt: 505 case Bytecodes::_ifle: 506 case Bytecodes::_ifne: 507 case Bytecodes::_ifnonnull: 508 case Bytecodes::_ifgt: 509 case Bytecodes::_ifge: 510 case Bytecodes::_if_icmpeq: 511 case Bytecodes::_if_icmpne: 512 case Bytecodes::_if_icmplt: 513 case Bytecodes::_if_icmpgt: 514 case Bytecodes::_if_icmple: 515 case Bytecodes::_if_icmpge: 516 case Bytecodes::_if_acmpeq: 517 case Bytecodes::_if_acmpne: 518 case Bytecodes::_goto: 519 case Bytecodes::_jsr: 520 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 521 break; 522 523 case Bytecodes::_goto_w: 524 case Bytecodes::_jsr_w: 525 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 526 break; 527 } 528 } 529 _access_flags.set_loops_flag_init(); 530 return _access_flags.has_loops(); 531 } 532 533 bool Method::is_final_method(AccessFlags class_access_flags) const { 534 // or "does_not_require_vtable_entry" 535 // default method or overpass can occur, is not final (reuses vtable entry) 536 // private methods get vtable entries for backward class compatibility. 537 if (is_overpass() || is_default_method()) return false; 538 return is_final() || class_access_flags.is_final(); 539 } 540 541 bool Method::is_final_method() const { 542 return is_final_method(method_holder()->access_flags()); 543 } 544 545 bool Method::is_default_method() const { 546 if (method_holder() != NULL && 547 method_holder()->is_interface() && 548 !is_abstract()) { 549 return true; 550 } else { 551 return false; 552 } 553 } 554 555 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 556 if (is_final_method(class_access_flags)) return true; 557 #ifdef ASSERT 558 ResourceMark rm; 559 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 560 if (class_access_flags.is_interface()) { 561 assert(is_nonv == is_static(), err_msg("is_nonv=%s", name_and_sig_as_C_string())); 562 } 563 #endif 564 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 565 return vtable_index() == nonvirtual_vtable_index; 566 } 567 568 bool Method::can_be_statically_bound() const { 569 return can_be_statically_bound(method_holder()->access_flags()); 570 } 571 572 bool Method::is_accessor() const { 573 if (code_size() != 5) return false; 574 if (size_of_parameters() != 1) return false; 575 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; 576 if (java_code_at(1) != Bytecodes::_getfield) return false; 577 if (java_code_at(4) != Bytecodes::_areturn && 578 java_code_at(4) != Bytecodes::_ireturn ) return false; 579 return true; 580 } 581 582 bool Method::is_constant_getter() const { 583 int last_index = code_size() - 1; 584 // Check if the first 1-3 bytecodes are a constant push 585 // and the last bytecode is a return. 586 return (2 <= code_size() && code_size() <= 4 && 587 Bytecodes::is_const(java_code_at(0)) && 588 Bytecodes::length_for(java_code_at(0)) == last_index && 589 Bytecodes::is_return(java_code_at(last_index))); 590 } 591 592 bool Method::is_initializer() const { 593 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); 594 } 595 596 bool Method::has_valid_initializer_flags() const { 597 return (is_static() || 598 method_holder()->major_version() < 51); 599 } 600 601 bool Method::is_static_initializer() const { 602 // For classfiles version 51 or greater, ensure that the clinit method is 603 // static. Non-static methods with the name "<clinit>" are not static 604 // initializers. (older classfiles exempted for backward compatibility) 605 return name() == vmSymbols::class_initializer_name() && 606 has_valid_initializer_flags(); 607 } 608 609 610 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) { 611 int length = this_oop->checked_exceptions_length(); 612 if (length == 0) { // common case 613 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 614 } else { 615 methodHandle h_this(THREAD, this_oop); 616 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 617 objArrayHandle mirrors (THREAD, m_oop); 618 for (int i = 0; i < length; i++) { 619 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 620 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 621 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 622 mirrors->obj_at_put(i, k->java_mirror()); 623 } 624 return mirrors; 625 } 626 }; 627 628 629 int Method::line_number_from_bci(int bci) const { 630 if (bci == SynchronizationEntryBCI) bci = 0; 631 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 632 int best_bci = 0; 633 int best_line = -1; 634 635 if (has_linenumber_table()) { 636 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 637 // Not necessarily sorted and not necessarily one-to-one. 638 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 639 while (stream.read_pair()) { 640 if (stream.bci() == bci) { 641 // perfect match 642 return stream.line(); 643 } else { 644 // update best_bci/line 645 if (stream.bci() < bci && stream.bci() >= best_bci) { 646 best_bci = stream.bci(); 647 best_line = stream.line(); 648 } 649 } 650 } 651 } 652 return best_line; 653 } 654 655 656 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 657 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 658 Thread *thread = Thread::current(); 659 Symbol* klass_name = constants()->klass_name_at(klass_index); 660 Handle loader(thread, method_holder()->class_loader()); 661 Handle prot (thread, method_holder()->protection_domain()); 662 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 663 } else { 664 return true; 665 } 666 } 667 668 669 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 670 int klass_index = constants()->klass_ref_index_at(refinfo_index); 671 if (must_be_resolved) { 672 // Make sure klass is resolved in constantpool. 673 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 674 } 675 return is_klass_loaded_by_klass_index(klass_index); 676 } 677 678 679 void Method::set_native_function(address function, bool post_event_flag) { 680 assert(function != NULL, "use clear_native_function to unregister natives"); 681 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 682 address* native_function = native_function_addr(); 683 684 // We can see racers trying to place the same native function into place. Once 685 // is plenty. 686 address current = *native_function; 687 if (current == function) return; 688 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 689 function != NULL) { 690 // native_method_throw_unsatisfied_link_error_entry() should only 691 // be passed when post_event_flag is false. 692 assert(function != 693 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 694 "post_event_flag mis-match"); 695 696 // post the bind event, and possible change the bind function 697 JvmtiExport::post_native_method_bind(this, &function); 698 } 699 *native_function = function; 700 // This function can be called more than once. We must make sure that we always 701 // use the latest registered method -> check if a stub already has been generated. 702 // If so, we have to make it not_entrant. 703 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 704 if (nm != NULL) { 705 nm->make_not_entrant(); 706 } 707 } 708 709 710 bool Method::has_native_function() const { 711 if (is_method_handle_intrinsic()) 712 return false; // special-cased in SharedRuntime::generate_native_wrapper 713 address func = native_function(); 714 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 715 } 716 717 718 void Method::clear_native_function() { 719 // Note: is_method_handle_intrinsic() is allowed here. 720 set_native_function( 721 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 722 !native_bind_event_is_interesting); 723 clear_code(); 724 } 725 726 address Method::critical_native_function() { 727 methodHandle mh(this); 728 return NativeLookup::lookup_critical_entry(mh); 729 } 730 731 732 void Method::set_signature_handler(address handler) { 733 address* signature_handler = signature_handler_addr(); 734 *signature_handler = handler; 735 } 736 737 738 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 739 if (PrintCompilation && report) { 740 ttyLocker ttyl; 741 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 742 if (comp_level == CompLevel_all) { 743 tty->print("all levels "); 744 } else { 745 tty->print("levels "); 746 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 747 tty->print("%d ", i); 748 } 749 } 750 this->print_short_name(tty); 751 int size = this->code_size(); 752 if (size > 0) { 753 tty->print(" (%d bytes)", size); 754 } 755 if (reason != NULL) { 756 tty->print(" %s", reason); 757 } 758 tty->cr(); 759 } 760 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 761 ttyLocker ttyl; 762 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 763 os::current_thread_id(), is_osr, comp_level); 764 if (reason != NULL) { 765 xtty->print(" reason=\'%s\'", reason); 766 } 767 xtty->method(this); 768 xtty->stamp(); 769 xtty->end_elem(); 770 } 771 } 772 773 bool Method::is_always_compilable() const { 774 // Generated adapters must be compiled 775 if (is_method_handle_intrinsic() && is_synthetic()) { 776 assert(!is_not_c1_compilable(), "sanity check"); 777 assert(!is_not_c2_compilable(), "sanity check"); 778 return true; 779 } 780 781 return false; 782 } 783 784 bool Method::is_not_compilable(int comp_level) const { 785 if (number_of_breakpoints() > 0) 786 return true; 787 if (is_always_compilable()) 788 return false; 789 if (comp_level == CompLevel_any) 790 return is_not_c1_compilable() || is_not_c2_compilable(); 791 if (is_c1_compile(comp_level)) 792 return is_not_c1_compilable(); 793 if (is_c2_compile(comp_level)) 794 return is_not_c2_compilable(); 795 return false; 796 } 797 798 // call this when compiler finds that this method is not compilable 799 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 800 if (is_always_compilable()) { 801 // Don't mark a method which should be always compilable 802 return; 803 } 804 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 805 if (comp_level == CompLevel_all) { 806 set_not_c1_compilable(); 807 set_not_c2_compilable(); 808 } else { 809 if (is_c1_compile(comp_level)) 810 set_not_c1_compilable(); 811 if (is_c2_compile(comp_level)) 812 set_not_c2_compilable(); 813 } 814 CompilationPolicy::policy()->disable_compilation(this); 815 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 816 } 817 818 bool Method::is_not_osr_compilable(int comp_level) const { 819 if (is_not_compilable(comp_level)) 820 return true; 821 if (comp_level == CompLevel_any) 822 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 823 if (is_c1_compile(comp_level)) 824 return is_not_c1_osr_compilable(); 825 if (is_c2_compile(comp_level)) 826 return is_not_c2_osr_compilable(); 827 return false; 828 } 829 830 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 831 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 832 if (comp_level == CompLevel_all) { 833 set_not_c1_osr_compilable(); 834 set_not_c2_osr_compilable(); 835 } else { 836 if (is_c1_compile(comp_level)) 837 set_not_c1_osr_compilable(); 838 if (is_c2_compile(comp_level)) 839 set_not_c2_osr_compilable(); 840 } 841 CompilationPolicy::policy()->disable_compilation(this); 842 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 843 } 844 845 // Revert to using the interpreter and clear out the nmethod 846 void Method::clear_code() { 847 848 // this may be NULL if c2i adapters have not been made yet 849 // Only should happen at allocate time. 850 if (_adapter == NULL) { 851 _from_compiled_entry = NULL; 852 } else { 853 _from_compiled_entry = _adapter->get_c2i_entry(); 854 } 855 OrderAccess::storestore(); 856 _from_interpreted_entry = _i2i_entry; 857 OrderAccess::storestore(); 858 _code = NULL; 859 } 860 861 // Called by class data sharing to remove any entry points (which are not shared) 862 void Method::unlink_method() { 863 _code = NULL; 864 _i2i_entry = NULL; 865 _from_interpreted_entry = NULL; 866 if (is_native()) { 867 *native_function_addr() = NULL; 868 set_signature_handler(NULL); 869 } 870 NOT_PRODUCT(set_compiled_invocation_count(0);) 871 _adapter = NULL; 872 _from_compiled_entry = NULL; 873 874 // In case of DumpSharedSpaces, _method_data should always be NULL. 875 // 876 // During runtime (!DumpSharedSpaces), when we are cleaning a 877 // shared class that failed to load, this->link_method() may 878 // have already been called (before an exception happened), so 879 // this->_method_data may not be NULL. 880 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?"); 881 882 set_method_data(NULL); 883 clear_method_counters(); 884 } 885 886 // Called when the method_holder is getting linked. Setup entrypoints so the method 887 // is ready to be called from interpreter, compiler, and vtables. 888 void Method::link_method(methodHandle h_method, TRAPS) { 889 // If the code cache is full, we may reenter this function for the 890 // leftover methods that weren't linked. 891 if (_i2i_entry != NULL) return; 892 893 assert(_adapter == NULL, "init'd to NULL" ); 894 assert( _code == NULL, "nothing compiled yet" ); 895 896 // Setup interpreter entrypoint 897 assert(this == h_method(), "wrong h_method()" ); 898 address entry = Interpreter::entry_for_method(h_method); 899 assert(entry != NULL, "interpreter entry must be non-null"); 900 // Sets both _i2i_entry and _from_interpreted_entry 901 set_interpreter_entry(entry); 902 903 // Don't overwrite already registered native entries. 904 if (is_native() && !has_native_function()) { 905 set_native_function( 906 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 907 !native_bind_event_is_interesting); 908 } 909 910 // Setup compiler entrypoint. This is made eagerly, so we do not need 911 // special handling of vtables. An alternative is to make adapters more 912 // lazily by calling make_adapter() from from_compiled_entry() for the 913 // normal calls. For vtable calls life gets more complicated. When a 914 // call-site goes mega-morphic we need adapters in all methods which can be 915 // called from the vtable. We need adapters on such methods that get loaded 916 // later. Ditto for mega-morphic itable calls. If this proves to be a 917 // problem we'll make these lazily later. 918 (void) make_adapters(h_method, CHECK); 919 920 // ONLY USE the h_method now as make_adapter may have blocked 921 922 } 923 924 address Method::make_adapters(methodHandle mh, TRAPS) { 925 // Adapters for compiled code are made eagerly here. They are fairly 926 // small (generally < 100 bytes) and quick to make (and cached and shared) 927 // so making them eagerly shouldn't be too expensive. 928 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 929 if (adapter == NULL ) { 930 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); 931 } 932 933 mh->set_adapter_entry(adapter); 934 mh->_from_compiled_entry = adapter->get_c2i_entry(); 935 return adapter->get_c2i_entry(); 936 } 937 938 void Method::restore_unshareable_info(TRAPS) { 939 // Since restore_unshareable_info can be called more than once for a method, don't 940 // redo any work. If this field is restored, there is nothing to do. 941 if (_from_compiled_entry == NULL) { 942 // restore method's vtable by calling a virtual function 943 restore_vtable(); 944 945 methodHandle mh(THREAD, this); 946 link_method(mh, CHECK); 947 } 948 } 949 950 951 // The verified_code_entry() must be called when a invoke is resolved 952 // on this method. 953 954 // It returns the compiled code entry point, after asserting not null. 955 // This function is called after potential safepoints so that nmethod 956 // or adapter that it points to is still live and valid. 957 // This function must not hit a safepoint! 958 address Method::verified_code_entry() { 959 debug_only(No_Safepoint_Verifier nsv;) 960 assert(_from_compiled_entry != NULL, "must be set"); 961 return _from_compiled_entry; 962 } 963 964 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 965 // (could be racing a deopt). 966 // Not inline to avoid circular ref. 967 bool Method::check_code() const { 968 // cached in a register or local. There's a race on the value of the field. 969 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 970 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 971 } 972 973 // Install compiled code. Instantly it can execute. 974 void Method::set_code(methodHandle mh, nmethod *code) { 975 assert( code, "use clear_code to remove code" ); 976 assert( mh->check_code(), "" ); 977 978 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 979 980 // These writes must happen in this order, because the interpreter will 981 // directly jump to from_interpreted_entry which jumps to an i2c adapter 982 // which jumps to _from_compiled_entry. 983 mh->_code = code; // Assign before allowing compiled code to exec 984 985 int comp_level = code->comp_level(); 986 // In theory there could be a race here. In practice it is unlikely 987 // and not worth worrying about. 988 if (comp_level > mh->highest_comp_level()) { 989 mh->set_highest_comp_level(comp_level); 990 } 991 992 OrderAccess::storestore(); 993 #ifdef SHARK 994 mh->_from_interpreted_entry = code->insts_begin(); 995 #else //!SHARK 996 mh->_from_compiled_entry = code->verified_entry_point(); 997 OrderAccess::storestore(); 998 // Instantly compiled code can execute. 999 if (!mh->is_method_handle_intrinsic()) 1000 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1001 #endif //!SHARK 1002 } 1003 1004 1005 bool Method::is_overridden_in(Klass* k) const { 1006 InstanceKlass* ik = InstanceKlass::cast(k); 1007 1008 if (ik->is_interface()) return false; 1009 1010 // If method is an interface, we skip it - except if it 1011 // is a miranda method 1012 if (method_holder()->is_interface()) { 1013 // Check that method is not a miranda method 1014 if (ik->lookup_method(name(), signature()) == NULL) { 1015 // No implementation exist - so miranda method 1016 return false; 1017 } 1018 return true; 1019 } 1020 1021 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1022 assert(ik->vtable() != NULL, "vtable should exist"); 1023 if (!has_vtable_index()) { 1024 return false; 1025 } else { 1026 Method* vt_m = ik->method_at_vtable(vtable_index()); 1027 return vt_m != this; 1028 } 1029 } 1030 1031 1032 // give advice about whether this Method* should be cached or not 1033 bool Method::should_not_be_cached() const { 1034 if (is_old()) { 1035 // This method has been redefined. It is either EMCP or obsolete 1036 // and we don't want to cache it because that would pin the method 1037 // down and prevent it from being collectible if and when it 1038 // finishes executing. 1039 return true; 1040 } 1041 1042 // caching this method should be just fine 1043 return false; 1044 } 1045 1046 1047 /** 1048 * Returns true if this is one of the specially treated methods for 1049 * security related stack walks (like Reflection.getCallerClass). 1050 */ 1051 bool Method::is_ignored_by_security_stack_walk() const { 1052 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection; 1053 1054 if (intrinsic_id() == vmIntrinsics::_invoke) { 1055 // This is Method.invoke() -- ignore it 1056 return true; 1057 } 1058 if (use_new_reflection && 1059 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1060 // This is an auxilary frame -- ignore it 1061 return true; 1062 } 1063 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1064 // This is an internal adapter frame for method handles -- ignore it 1065 return true; 1066 } 1067 return false; 1068 } 1069 1070 1071 // Constant pool structure for invoke methods: 1072 enum { 1073 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1074 _imcp_invoke_signature, // utf8: (variable Symbol*) 1075 _imcp_limit 1076 }; 1077 1078 // Test if this method is an MH adapter frame generated by Java code. 1079 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1080 bool Method::is_compiled_lambda_form() const { 1081 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1082 } 1083 1084 // Test if this method is an internal MH primitive method. 1085 bool Method::is_method_handle_intrinsic() const { 1086 vmIntrinsics::ID iid = intrinsic_id(); 1087 return (MethodHandles::is_signature_polymorphic(iid) && 1088 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1089 } 1090 1091 bool Method::has_member_arg() const { 1092 vmIntrinsics::ID iid = intrinsic_id(); 1093 return (MethodHandles::is_signature_polymorphic(iid) && 1094 MethodHandles::has_member_arg(iid)); 1095 } 1096 1097 // Make an instance of a signature-polymorphic internal MH primitive. 1098 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1099 Symbol* signature, 1100 TRAPS) { 1101 ResourceMark rm; 1102 methodHandle empty; 1103 1104 KlassHandle holder = SystemDictionary::MethodHandle_klass(); 1105 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1106 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1107 if (TraceMethodHandles) { 1108 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1109 } 1110 1111 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1112 name->increment_refcount(); 1113 signature->increment_refcount(); 1114 1115 int cp_length = _imcp_limit; 1116 ClassLoaderData* loader_data = holder->class_loader_data(); 1117 constantPoolHandle cp; 1118 { 1119 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1120 cp = constantPoolHandle(THREAD, cp_oop); 1121 } 1122 cp->set_pool_holder(InstanceKlass::cast(holder())); 1123 cp->symbol_at_put(_imcp_invoke_name, name); 1124 cp->symbol_at_put(_imcp_invoke_signature, signature); 1125 cp->set_has_preresolution(); 1126 1127 // decide on access bits: public or not? 1128 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1129 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1130 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1131 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1132 1133 methodHandle m; 1134 { 1135 InlineTableSizes sizes; 1136 Method* m_oop = Method::allocate(loader_data, 0, 1137 accessFlags_from(flags_bits), &sizes, 1138 ConstMethod::NORMAL, CHECK_(empty)); 1139 m = methodHandle(THREAD, m_oop); 1140 } 1141 m->set_constants(cp()); 1142 m->set_name_index(_imcp_invoke_name); 1143 m->set_signature_index(_imcp_invoke_signature); 1144 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1145 assert(m->signature() == signature, ""); 1146 ResultTypeFinder rtf(signature); 1147 m->constMethod()->set_result_type(rtf.type()); 1148 m->compute_size_of_parameters(THREAD); 1149 m->init_intrinsic_id(); 1150 assert(m->is_method_handle_intrinsic(), ""); 1151 #ifdef ASSERT 1152 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1153 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1154 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1155 #endif //ASSERT 1156 1157 // Finally, set up its entry points. 1158 assert(m->can_be_statically_bound(), ""); 1159 m->set_vtable_index(Method::nonvirtual_vtable_index); 1160 m->link_method(m, CHECK_(empty)); 1161 1162 if (TraceMethodHandles && (Verbose || WizardMode)) 1163 m->print_on(tty); 1164 1165 return m; 1166 } 1167 1168 Klass* Method::check_non_bcp_klass(Klass* klass) { 1169 if (klass != NULL && klass->class_loader() != NULL) { 1170 if (klass->oop_is_objArray()) 1171 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1172 return klass; 1173 } 1174 return NULL; 1175 } 1176 1177 1178 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1179 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1180 // Code below does not work for native methods - they should never get rewritten anyway 1181 assert(!m->is_native(), "cannot rewrite native methods"); 1182 // Allocate new Method* 1183 AccessFlags flags = m->access_flags(); 1184 1185 ConstMethod* cm = m->constMethod(); 1186 int checked_exceptions_len = cm->checked_exceptions_length(); 1187 int localvariable_len = cm->localvariable_table_length(); 1188 int exception_table_len = cm->exception_table_length(); 1189 int method_parameters_len = cm->method_parameters_length(); 1190 int method_annotations_len = cm->method_annotations_length(); 1191 int parameter_annotations_len = cm->parameter_annotations_length(); 1192 int type_annotations_len = cm->type_annotations_length(); 1193 int default_annotations_len = cm->default_annotations_length(); 1194 1195 InlineTableSizes sizes( 1196 localvariable_len, 1197 new_compressed_linenumber_size, 1198 exception_table_len, 1199 checked_exceptions_len, 1200 method_parameters_len, 1201 cm->generic_signature_index(), 1202 method_annotations_len, 1203 parameter_annotations_len, 1204 type_annotations_len, 1205 default_annotations_len, 1206 0); 1207 1208 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1209 Method* newm_oop = Method::allocate(loader_data, 1210 new_code_length, 1211 flags, 1212 &sizes, 1213 m->method_type(), 1214 CHECK_(methodHandle())); 1215 methodHandle newm (THREAD, newm_oop); 1216 int new_method_size = newm->method_size(); 1217 1218 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1219 ConstMethod* newcm = newm->constMethod(); 1220 int new_const_method_size = newm->constMethod()->size(); 1221 1222 memcpy(newm(), m(), sizeof(Method)); 1223 1224 // Create shallow copy of ConstMethod. 1225 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1226 1227 // Reset correct method/const method, method size, and parameter info 1228 newm->set_constMethod(newcm); 1229 newm->constMethod()->set_code_size(new_code_length); 1230 newm->constMethod()->set_constMethod_size(new_const_method_size); 1231 newm->set_method_size(new_method_size); 1232 assert(newm->code_size() == new_code_length, "check"); 1233 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1234 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1235 assert(newm->exception_table_length() == exception_table_len, "check"); 1236 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1237 // Copy new byte codes 1238 memcpy(newm->code_base(), new_code, new_code_length); 1239 // Copy line number table 1240 if (new_compressed_linenumber_size > 0) { 1241 memcpy(newm->compressed_linenumber_table(), 1242 new_compressed_linenumber_table, 1243 new_compressed_linenumber_size); 1244 } 1245 // Copy method_parameters 1246 if (method_parameters_len > 0) { 1247 memcpy(newm->method_parameters_start(), 1248 m->method_parameters_start(), 1249 method_parameters_len * sizeof(MethodParametersElement)); 1250 } 1251 // Copy checked_exceptions 1252 if (checked_exceptions_len > 0) { 1253 memcpy(newm->checked_exceptions_start(), 1254 m->checked_exceptions_start(), 1255 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1256 } 1257 // Copy exception table 1258 if (exception_table_len > 0) { 1259 memcpy(newm->exception_table_start(), 1260 m->exception_table_start(), 1261 exception_table_len * sizeof(ExceptionTableElement)); 1262 } 1263 // Copy local variable number table 1264 if (localvariable_len > 0) { 1265 memcpy(newm->localvariable_table_start(), 1266 m->localvariable_table_start(), 1267 localvariable_len * sizeof(LocalVariableTableElement)); 1268 } 1269 // Copy stackmap table 1270 if (m->has_stackmap_table()) { 1271 int code_attribute_length = m->stackmap_data()->length(); 1272 Array<u1>* stackmap_data = 1273 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1274 memcpy((void*)stackmap_data->adr_at(0), 1275 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1276 newm->set_stackmap_data(stackmap_data); 1277 } 1278 1279 // copy annotations over to new method 1280 newcm->copy_annotations_from(cm); 1281 return newm; 1282 } 1283 1284 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) { 1285 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1286 // because we are not loading from core libraries 1287 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1288 // which does not use the class default class loader so we check for its loader here 1289 InstanceKlass* ik = InstanceKlass::cast(holder); 1290 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) { 1291 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1292 } 1293 1294 // see if the klass name is well-known: 1295 Symbol* klass_name = ik->name(); 1296 return vmSymbols::find_sid(klass_name); 1297 } 1298 1299 void Method::init_intrinsic_id() { 1300 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1301 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1302 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1303 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1304 1305 // the klass name is well-known: 1306 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1307 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1308 1309 // ditto for method and signature: 1310 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1311 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1312 && name_id == vmSymbols::NO_SID) 1313 return; 1314 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1315 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1316 && sig_id == vmSymbols::NO_SID) return; 1317 jshort flags = access_flags().as_short(); 1318 1319 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1320 if (id != vmIntrinsics::_none) { 1321 set_intrinsic_id(id); 1322 return; 1323 } 1324 1325 // A few slightly irregular cases: 1326 switch (klass_id) { 1327 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1328 // Second chance: check in regular Math. 1329 switch (name_id) { 1330 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1331 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1332 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1333 // pretend it is the corresponding method in the non-strict class: 1334 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1335 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1336 break; 1337 } 1338 break; 1339 1340 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. 1341 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1342 if (!is_native()) break; 1343 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1344 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1345 id = vmIntrinsics::_none; 1346 break; 1347 } 1348 1349 if (id != vmIntrinsics::_none) { 1350 // Set up its iid. It is an alias method. 1351 set_intrinsic_id(id); 1352 return; 1353 } 1354 } 1355 1356 // These two methods are static since a GC may move the Method 1357 bool Method::load_signature_classes(methodHandle m, TRAPS) { 1358 if (THREAD->is_Compiler_thread()) { 1359 // There is nothing useful this routine can do from within the Compile thread. 1360 // Hopefully, the signature contains only well-known classes. 1361 // We could scan for this and return true/false, but the caller won't care. 1362 return false; 1363 } 1364 bool sig_is_loaded = true; 1365 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1366 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1367 ResourceMark rm(THREAD); 1368 Symbol* signature = m->signature(); 1369 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1370 if (ss.is_object()) { 1371 Symbol* sym = ss.as_symbol(CHECK_(false)); 1372 Symbol* name = sym; 1373 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1374 protection_domain, THREAD); 1375 // We are loading classes eagerly. If a ClassNotFoundException or 1376 // a LinkageError was generated, be sure to ignore it. 1377 if (HAS_PENDING_EXCEPTION) { 1378 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1379 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1380 CLEAR_PENDING_EXCEPTION; 1381 } else { 1382 return false; 1383 } 1384 } 1385 if( klass == NULL) { sig_is_loaded = false; } 1386 } 1387 } 1388 return sig_is_loaded; 1389 } 1390 1391 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1392 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1393 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1394 ResourceMark rm(THREAD); 1395 Symbol* signature = m->signature(); 1396 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1397 if (ss.type() == T_OBJECT) { 1398 Symbol* name = ss.as_symbol_or_null(); 1399 if (name == NULL) return true; 1400 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1401 if (klass == NULL) return true; 1402 } 1403 } 1404 return false; 1405 } 1406 1407 // Exposed so field engineers can debug VM 1408 void Method::print_short_name(outputStream* st) { 1409 ResourceMark rm; 1410 #ifdef PRODUCT 1411 st->print(" %s::", method_holder()->external_name()); 1412 #else 1413 st->print(" %s::", method_holder()->internal_name()); 1414 #endif 1415 name()->print_symbol_on(st); 1416 if (WizardMode) signature()->print_symbol_on(st); 1417 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1418 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1419 } 1420 1421 // Comparer for sorting an object array containing 1422 // Method*s. 1423 static int method_comparator(Method* a, Method* b) { 1424 return a->name()->fast_compare(b->name()); 1425 } 1426 1427 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1428 // default_methods also uses this without the ordering for fast find_method 1429 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) { 1430 int length = methods->length(); 1431 if (length > 1) { 1432 { 1433 No_Safepoint_Verifier nsv; 1434 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); 1435 } 1436 // Reset method ordering 1437 if (set_idnums) { 1438 for (int i = 0; i < length; i++) { 1439 Method* m = methods->at(i); 1440 m->set_method_idnum(i); 1441 m->set_orig_method_idnum(i); 1442 } 1443 } 1444 } 1445 } 1446 1447 //----------------------------------------------------------------------------------- 1448 // Non-product code unless JVM/TI needs it 1449 1450 #if !defined(PRODUCT) || INCLUDE_JVMTI 1451 class SignatureTypePrinter : public SignatureTypeNames { 1452 private: 1453 outputStream* _st; 1454 bool _use_separator; 1455 1456 void type_name(const char* name) { 1457 if (_use_separator) _st->print(", "); 1458 _st->print("%s", name); 1459 _use_separator = true; 1460 } 1461 1462 public: 1463 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1464 _st = st; 1465 _use_separator = false; 1466 } 1467 1468 void print_parameters() { _use_separator = false; iterate_parameters(); } 1469 void print_returntype() { _use_separator = false; iterate_returntype(); } 1470 }; 1471 1472 1473 void Method::print_name(outputStream* st) { 1474 Thread *thread = Thread::current(); 1475 ResourceMark rm(thread); 1476 SignatureTypePrinter sig(signature(), st); 1477 st->print("%s ", is_static() ? "static" : "virtual"); 1478 sig.print_returntype(); 1479 st->print(" %s.", method_holder()->internal_name()); 1480 name()->print_symbol_on(st); 1481 st->print("("); 1482 sig.print_parameters(); 1483 st->print(")"); 1484 } 1485 #endif // !PRODUCT || INCLUDE_JVMTI 1486 1487 1488 //----------------------------------------------------------------------------------- 1489 // Non-product code 1490 1491 #ifndef PRODUCT 1492 void Method::print_codes_on(outputStream* st) const { 1493 print_codes_on(0, code_size(), st); 1494 } 1495 1496 void Method::print_codes_on(int from, int to, outputStream* st) const { 1497 Thread *thread = Thread::current(); 1498 ResourceMark rm(thread); 1499 methodHandle mh (thread, (Method*)this); 1500 BytecodeStream s(mh); 1501 s.set_interval(from, to); 1502 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1503 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1504 } 1505 #endif // not PRODUCT 1506 1507 1508 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1509 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1510 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1511 // as end-of-stream terminator. 1512 1513 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1514 // bci and line number does not compress into single byte. 1515 // Write out escape character and use regular compression for bci and line number. 1516 write_byte((jubyte)0xFF); 1517 write_signed_int(bci_delta); 1518 write_signed_int(line_delta); 1519 } 1520 1521 // See comment in method.hpp which explains why this exists. 1522 #if defined(_M_AMD64) && _MSC_VER >= 1400 1523 #pragma optimize("", off) 1524 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1525 write_pair_inline(bci, line); 1526 } 1527 #pragma optimize("", on) 1528 #endif 1529 1530 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1531 _bci = 0; 1532 _line = 0; 1533 }; 1534 1535 1536 bool CompressedLineNumberReadStream::read_pair() { 1537 jubyte next = read_byte(); 1538 // Check for terminator 1539 if (next == 0) return false; 1540 if (next == 0xFF) { 1541 // Escape character, regular compression used 1542 _bci += read_signed_int(); 1543 _line += read_signed_int(); 1544 } else { 1545 // Single byte compression used 1546 _bci += next >> 3; 1547 _line += next & 0x7; 1548 } 1549 return true; 1550 } 1551 1552 1553 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1554 BreakpointInfo* bp = method_holder()->breakpoints(); 1555 for (; bp != NULL; bp = bp->next()) { 1556 if (bp->match(this, bci)) { 1557 return bp->orig_bytecode(); 1558 } 1559 } 1560 { 1561 ResourceMark rm; 1562 fatal(err_msg("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci)); 1563 } 1564 return Bytecodes::_shouldnotreachhere; 1565 } 1566 1567 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1568 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1569 BreakpointInfo* bp = method_holder()->breakpoints(); 1570 for (; bp != NULL; bp = bp->next()) { 1571 if (bp->match(this, bci)) { 1572 bp->set_orig_bytecode(code); 1573 // and continue, in case there is more than one 1574 } 1575 } 1576 } 1577 1578 void Method::set_breakpoint(int bci) { 1579 InstanceKlass* ik = method_holder(); 1580 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1581 bp->set_next(ik->breakpoints()); 1582 ik->set_breakpoints(bp); 1583 // do this last: 1584 bp->set(this); 1585 } 1586 1587 static void clear_matches(Method* m, int bci) { 1588 InstanceKlass* ik = m->method_holder(); 1589 BreakpointInfo* prev_bp = NULL; 1590 BreakpointInfo* next_bp; 1591 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1592 next_bp = bp->next(); 1593 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1594 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1595 // do this first: 1596 bp->clear(m); 1597 // unhook it 1598 if (prev_bp != NULL) 1599 prev_bp->set_next(next_bp); 1600 else 1601 ik->set_breakpoints(next_bp); 1602 delete bp; 1603 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1604 // at same location. So we have multiple matching (method_index and bci) 1605 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1606 // breakpoint for clear_breakpoint request and keep all other method versions 1607 // BreakpointInfo for future clear_breakpoint request. 1608 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1609 // which is being called when class is unloaded. We delete all the Breakpoint 1610 // information for all versions of method. We may not correctly restore the original 1611 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1612 // so these methods won't be used anymore. 1613 if (bci >= 0) { 1614 break; 1615 } 1616 } else { 1617 // This one is a keeper. 1618 prev_bp = bp; 1619 } 1620 } 1621 } 1622 1623 void Method::clear_breakpoint(int bci) { 1624 assert(bci >= 0, ""); 1625 clear_matches(this, bci); 1626 } 1627 1628 void Method::clear_all_breakpoints() { 1629 clear_matches(this, -1); 1630 } 1631 1632 1633 int Method::invocation_count() { 1634 MethodCounters *mcs = method_counters(); 1635 if (TieredCompilation) { 1636 MethodData* const mdo = method_data(); 1637 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1638 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1639 return InvocationCounter::count_limit; 1640 } else { 1641 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1642 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1643 } 1644 } else { 1645 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1646 } 1647 } 1648 1649 int Method::backedge_count() { 1650 MethodCounters *mcs = method_counters(); 1651 if (TieredCompilation) { 1652 MethodData* const mdo = method_data(); 1653 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1654 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1655 return InvocationCounter::count_limit; 1656 } else { 1657 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1658 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1659 } 1660 } else { 1661 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1662 } 1663 } 1664 1665 int Method::highest_comp_level() const { 1666 const MethodCounters* mcs = method_counters(); 1667 if (mcs != NULL) { 1668 return mcs->highest_comp_level(); 1669 } else { 1670 return CompLevel_none; 1671 } 1672 } 1673 1674 int Method::highest_osr_comp_level() const { 1675 const MethodCounters* mcs = method_counters(); 1676 if (mcs != NULL) { 1677 return mcs->highest_osr_comp_level(); 1678 } else { 1679 return CompLevel_none; 1680 } 1681 } 1682 1683 void Method::set_highest_comp_level(int level) { 1684 MethodCounters* mcs = method_counters(); 1685 if (mcs != NULL) { 1686 mcs->set_highest_comp_level(level); 1687 } 1688 } 1689 1690 void Method::set_highest_osr_comp_level(int level) { 1691 MethodCounters* mcs = method_counters(); 1692 if (mcs != NULL) { 1693 mcs->set_highest_osr_comp_level(level); 1694 } 1695 } 1696 1697 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1698 _bci = bci; 1699 _name_index = m->name_index(); 1700 _signature_index = m->signature_index(); 1701 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1702 if (_orig_bytecode == Bytecodes::_breakpoint) 1703 _orig_bytecode = m->orig_bytecode_at(_bci); 1704 _next = NULL; 1705 } 1706 1707 void BreakpointInfo::set(Method* method) { 1708 #ifdef ASSERT 1709 { 1710 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1711 if (code == Bytecodes::_breakpoint) 1712 code = method->orig_bytecode_at(_bci); 1713 assert(orig_bytecode() == code, "original bytecode must be the same"); 1714 } 1715 #endif 1716 Thread *thread = Thread::current(); 1717 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1718 method->incr_number_of_breakpoints(thread); 1719 SystemDictionary::notice_modification(); 1720 { 1721 // Deoptimize all dependents on this method 1722 HandleMark hm(thread); 1723 methodHandle mh(thread, method); 1724 Universe::flush_dependents_on_method(mh); 1725 } 1726 } 1727 1728 void BreakpointInfo::clear(Method* method) { 1729 *method->bcp_from(_bci) = orig_bytecode(); 1730 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1731 method->decr_number_of_breakpoints(Thread::current()); 1732 } 1733 1734 // jmethodID handling 1735 1736 // This is a block allocating object, sort of like JNIHandleBlock, only a 1737 // lot simpler. There aren't many of these, they aren't long, they are rarely 1738 // deleted and so we can do some suboptimal things. 1739 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1740 // never get rid of it. 1741 // It would be nice to be able to parameterize the number of methods for 1742 // the null_class_loader but then we'd have to turn this and ClassLoaderData 1743 // into templates. 1744 1745 // I feel like this brain dead class should exist somewhere in the STL 1746 1747 class JNIMethodBlock : public CHeapObj<mtClass> { 1748 enum { number_of_methods = 8 }; 1749 1750 Method* _methods[number_of_methods]; 1751 int _top; 1752 JNIMethodBlock* _next; 1753 public: 1754 static Method* const _free_method; 1755 1756 JNIMethodBlock() : _next(NULL), _top(0) { 1757 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method; 1758 } 1759 1760 Method** add_method(Method* m) { 1761 if (_top < number_of_methods) { 1762 // top points to the next free entry. 1763 int i = _top; 1764 _methods[i] = m; 1765 _top++; 1766 return &_methods[i]; 1767 } else if (_top == number_of_methods) { 1768 // if the next free entry ran off the block see if there's a free entry 1769 for (int i = 0; i< number_of_methods; i++) { 1770 if (_methods[i] == _free_method) { 1771 _methods[i] = m; 1772 return &_methods[i]; 1773 } 1774 } 1775 // Only check each block once for frees. They're very unlikely. 1776 // Increment top past the end of the block. 1777 _top++; 1778 } 1779 // need to allocate a next block. 1780 if (_next == NULL) { 1781 _next = new JNIMethodBlock(); 1782 } 1783 return _next->add_method(m); 1784 } 1785 1786 bool contains(Method** m) { 1787 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1788 for (int i = 0; i< number_of_methods; i++) { 1789 if (&(b->_methods[i]) == m) { 1790 return true; 1791 } 1792 } 1793 } 1794 return false; // not found 1795 } 1796 1797 // Doesn't really destroy it, just marks it as free so it can be reused. 1798 void destroy_method(Method** m) { 1799 #ifdef ASSERT 1800 assert(contains(m), "should be a methodID"); 1801 #endif // ASSERT 1802 *m = _free_method; 1803 } 1804 void clear_method(Method* m) { 1805 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1806 for (int i = 0; i < number_of_methods; i++) { 1807 if (b->_methods[i] == m) { 1808 b->_methods[i] = NULL; 1809 return; 1810 } 1811 } 1812 } 1813 // not found 1814 } 1815 1816 // During class unloading the methods are cleared, which is different 1817 // than freed. 1818 void clear_all_methods() { 1819 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1820 for (int i = 0; i< number_of_methods; i++) { 1821 b->_methods[i] = NULL; 1822 } 1823 } 1824 } 1825 #ifndef PRODUCT 1826 int count_methods() { 1827 // count all allocated methods 1828 int count = 0; 1829 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1830 for (int i = 0; i< number_of_methods; i++) { 1831 if (b->_methods[i] != _free_method) count++; 1832 } 1833 } 1834 return count; 1835 } 1836 #endif // PRODUCT 1837 }; 1838 1839 // Something that can't be mistaken for an address or a markOop 1840 Method* const JNIMethodBlock::_free_method = (Method*)55; 1841 1842 // Add a method id to the jmethod_ids 1843 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 1844 ClassLoaderData* cld = loader_data; 1845 1846 if (!SafepointSynchronize::is_at_safepoint()) { 1847 // Have to add jmethod_ids() to class loader data thread-safely. 1848 // Also have to add the method to the list safely, which the cld lock 1849 // protects as well. 1850 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 1851 if (cld->jmethod_ids() == NULL) { 1852 cld->set_jmethod_ids(new JNIMethodBlock()); 1853 } 1854 // jmethodID is a pointer to Method* 1855 return (jmethodID)cld->jmethod_ids()->add_method(m); 1856 } else { 1857 // At safepoint, we are single threaded and can set this. 1858 if (cld->jmethod_ids() == NULL) { 1859 cld->set_jmethod_ids(new JNIMethodBlock()); 1860 } 1861 // jmethodID is a pointer to Method* 1862 return (jmethodID)cld->jmethod_ids()->add_method(m); 1863 } 1864 } 1865 1866 // Mark a jmethodID as free. This is called when there is a data race in 1867 // InstanceKlass while creating the jmethodID cache. 1868 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 1869 ClassLoaderData* cld = loader_data; 1870 Method** ptr = (Method**)m; 1871 assert(cld->jmethod_ids() != NULL, "should have method handles"); 1872 cld->jmethod_ids()->destroy_method(ptr); 1873 } 1874 1875 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 1876 // Can't assert the method_holder is the same because the new method has the 1877 // scratch method holder. 1878 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 1879 == new_method->method_holder()->class_loader(), 1880 "changing to a different class loader"); 1881 // Just change the method in place, jmethodID pointer doesn't change. 1882 *((Method**)jmid) = new_method; 1883 } 1884 1885 bool Method::is_method_id(jmethodID mid) { 1886 Method* m = resolve_jmethod_id(mid); 1887 if (m == NULL) { 1888 return false; 1889 } 1890 InstanceKlass* ik = m->method_holder(); 1891 if (ik == NULL) { 1892 return false; 1893 } 1894 ClassLoaderData* cld = ik->class_loader_data(); 1895 if (cld->jmethod_ids() == NULL) return false; 1896 return (cld->jmethod_ids()->contains((Method**)mid)); 1897 } 1898 1899 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 1900 if (mid == NULL) return NULL; 1901 if (!Method::is_method_id(mid)) { 1902 return NULL; 1903 } 1904 Method* o = resolve_jmethod_id(mid); 1905 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 1906 return NULL; 1907 } 1908 return o; 1909 }; 1910 1911 void Method::set_on_stack(const bool value) { 1912 // Set both the method itself and its constant pool. The constant pool 1913 // on stack means some method referring to it is also on the stack. 1914 constants()->set_on_stack(value); 1915 1916 bool succeeded = _access_flags.set_on_stack(value); 1917 if (value && succeeded) { 1918 MetadataOnStackMark::record(this, Thread::current()); 1919 } 1920 } 1921 1922 void Method::clear_jmethod_id(ClassLoaderData* loader_data) { 1923 loader_data->jmethod_ids()->clear_method(this); 1924 } 1925 1926 // Called when the class loader is unloaded to make all methods weak. 1927 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 1928 loader_data->jmethod_ids()->clear_all_methods(); 1929 } 1930 1931 bool Method::has_method_vptr(const void* ptr) { 1932 Method m; 1933 // This assumes that the vtbl pointer is the first word of a C++ object. 1934 // This assumption is also in universe.cpp patch_klass_vtble 1935 void* vtbl2 = dereference_vptr((const void*)&m); 1936 void* this_vtbl = dereference_vptr(ptr); 1937 return vtbl2 == this_vtbl; 1938 } 1939 1940 // Check that this pointer is valid by checking that the vtbl pointer matches 1941 bool Method::is_valid_method() const { 1942 if (this == NULL) { 1943 return false; 1944 } else if (!is_metaspace_object()) { 1945 return false; 1946 } else { 1947 return has_method_vptr((const void*)this); 1948 } 1949 } 1950 1951 #ifndef PRODUCT 1952 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 1953 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 1954 } 1955 #endif // PRODUCT 1956 1957 1958 // Printing 1959 1960 #ifndef PRODUCT 1961 1962 void Method::print_on(outputStream* st) const { 1963 ResourceMark rm; 1964 assert(is_method(), "must be method"); 1965 st->print_cr("%s", internal_name()); 1966 // get the effect of PrintOopAddress, always, for methods: 1967 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this); 1968 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 1969 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants()); 1970 constants()->print_value_on(st); st->cr(); 1971 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 1972 st->print (" - name: "); name()->print_value_on(st); st->cr(); 1973 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 1974 st->print_cr(" - max stack: %d", max_stack()); 1975 st->print_cr(" - max locals: %d", max_locals()); 1976 st->print_cr(" - size of params: %d", size_of_parameters()); 1977 st->print_cr(" - method size: %d", method_size()); 1978 if (intrinsic_id() != vmIntrinsics::_none) 1979 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 1980 if (highest_comp_level() != CompLevel_none) 1981 st->print_cr(" - highest level: %d", highest_comp_level()); 1982 st->print_cr(" - vtable index: %d", _vtable_index); 1983 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry()); 1984 st->print( " - adapters: "); 1985 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 1986 if (a == NULL) 1987 st->print_cr(INTPTR_FORMAT, a); 1988 else 1989 a->print_adapter_on(st); 1990 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry()); 1991 st->print_cr(" - code size: %d", code_size()); 1992 if (code_size() != 0) { 1993 st->print_cr(" - code start: " INTPTR_FORMAT, code_base()); 1994 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size()); 1995 } 1996 if (method_data() != NULL) { 1997 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data()); 1998 } 1999 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2000 if (checked_exceptions_length() > 0) { 2001 CheckedExceptionElement* table = checked_exceptions_start(); 2002 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table); 2003 if (Verbose) { 2004 for (int i = 0; i < checked_exceptions_length(); i++) { 2005 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2006 } 2007 } 2008 } 2009 if (has_linenumber_table()) { 2010 u_char* table = compressed_linenumber_table(); 2011 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table); 2012 if (Verbose) { 2013 CompressedLineNumberReadStream stream(table); 2014 while (stream.read_pair()) { 2015 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2016 } 2017 } 2018 } 2019 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2020 if (localvariable_table_length() > 0) { 2021 LocalVariableTableElement* table = localvariable_table_start(); 2022 st->print_cr(" - localvar start: " INTPTR_FORMAT, table); 2023 if (Verbose) { 2024 for (int i = 0; i < localvariable_table_length(); i++) { 2025 int bci = table[i].start_bci; 2026 int len = table[i].length; 2027 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2028 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2029 int slot = table[i].slot; 2030 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2031 } 2032 } 2033 } 2034 if (code() != NULL) { 2035 st->print (" - compiled code: "); 2036 code()->print_value_on(st); 2037 } 2038 if (is_native()) { 2039 st->print_cr(" - native function: " INTPTR_FORMAT, native_function()); 2040 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler()); 2041 } 2042 } 2043 2044 #endif //PRODUCT 2045 2046 void Method::print_value_on(outputStream* st) const { 2047 assert(is_method(), "must be method"); 2048 st->print("%s", internal_name()); 2049 print_address_on(st); 2050 st->print(" "); 2051 name()->print_value_on(st); 2052 st->print(" "); 2053 signature()->print_value_on(st); 2054 st->print(" in "); 2055 method_holder()->print_value_on(st); 2056 if (WizardMode) st->print("#%d", _vtable_index); 2057 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2058 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2059 } 2060 2061 #if INCLUDE_SERVICES 2062 // Size Statistics 2063 void Method::collect_statistics(KlassSizeStats *sz) const { 2064 int mysize = sz->count(this); 2065 sz->_method_bytes += mysize; 2066 sz->_method_all_bytes += mysize; 2067 sz->_rw_bytes += mysize; 2068 2069 if (constMethod()) { 2070 constMethod()->collect_statistics(sz); 2071 } 2072 if (method_data()) { 2073 method_data()->collect_statistics(sz); 2074 } 2075 } 2076 #endif // INCLUDE_SERVICES 2077 2078 // Verification 2079 2080 void Method::verify_on(outputStream* st) { 2081 guarantee(is_method(), "object must be method"); 2082 guarantee(constants()->is_constantPool(), "should be constant pool"); 2083 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 2084 MethodData* md = method_data(); 2085 guarantee(md == NULL || 2086 md->is_methodData(), "should be method data"); 2087 }