1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/metadataOnStackMark.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "code/debugInfoRec.hpp" 29 #include "gc_interface/collectedHeap.inline.hpp" 30 #include "interpreter/bytecodeStream.hpp" 31 #include "interpreter/bytecodeTracer.hpp" 32 #include "interpreter/bytecodes.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "interpreter/oopMapCache.hpp" 35 #include "memory/gcLocker.hpp" 36 #include "memory/generation.hpp" 37 #include "memory/heapInspection.hpp" 38 #include "memory/metadataFactory.hpp" 39 #include "memory/oopFactory.hpp" 40 #include "oops/constMethod.hpp" 41 #include "oops/methodData.hpp" 42 #include "oops/method.hpp" 43 #include "oops/oop.inline.hpp" 44 #include "oops/symbol.hpp" 45 #include "prims/jvmtiExport.hpp" 46 #include "prims/methodHandles.hpp" 47 #include "prims/nativeLookup.hpp" 48 #include "runtime/arguments.hpp" 49 #include "runtime/compilationPolicy.hpp" 50 #include "runtime/frame.inline.hpp" 51 #include "runtime/handles.inline.hpp" 52 #include "runtime/orderAccess.inline.hpp" 53 #include "runtime/relocator.hpp" 54 #include "runtime/sharedRuntime.hpp" 55 #include "runtime/signature.hpp" 56 #include "utilities/quickSort.hpp" 57 #include "utilities/xmlstream.hpp" 58 59 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 60 61 // Implementation of Method 62 63 Method* Method::allocate(ClassLoaderData* loader_data, 64 int byte_code_size, 65 AccessFlags access_flags, 66 InlineTableSizes* sizes, 67 ConstMethod::MethodType method_type, 68 TRAPS) { 69 assert(!access_flags.is_native() || byte_code_size == 0, 70 "native methods should not contain byte codes"); 71 ConstMethod* cm = ConstMethod::allocate(loader_data, 72 byte_code_size, 73 sizes, 74 method_type, 75 CHECK_NULL); 76 77 int size = Method::size(access_flags.is_native()); 78 79 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags, size); 80 } 81 82 Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) { 83 No_Safepoint_Verifier no_safepoint; 84 set_constMethod(xconst); 85 set_access_flags(access_flags); 86 set_method_size(size); 87 #ifdef CC_INTERP 88 set_result_index(T_VOID); 89 #endif 90 set_intrinsic_id(vmIntrinsics::_none); 91 set_jfr_towrite(false); 92 set_force_inline(false); 93 set_hidden(false); 94 set_dont_inline(false); 95 set_method_data(NULL); 96 set_method_counters(NULL); 97 set_vtable_index(Method::garbage_vtable_index); 98 99 // Fix and bury in Method* 100 set_interpreter_entry(NULL); // sets i2i entry and from_int 101 set_adapter_entry(NULL); 102 clear_code(); // from_c/from_i get set to c2i/i2i 103 104 if (access_flags.is_native()) { 105 clear_native_function(); 106 set_signature_handler(NULL); 107 } 108 109 NOT_PRODUCT(set_compiled_invocation_count(0);) 110 } 111 112 // Release Method*. The nmethod will be gone when we get here because 113 // we've walked the code cache. 114 void Method::deallocate_contents(ClassLoaderData* loader_data) { 115 MetadataFactory::free_metadata(loader_data, constMethod()); 116 set_constMethod(NULL); 117 MetadataFactory::free_metadata(loader_data, method_data()); 118 set_method_data(NULL); 119 MetadataFactory::free_metadata(loader_data, method_counters()); 120 set_method_counters(NULL); 121 // The nmethod will be gone when we get here. 122 if (code() != NULL) _code = NULL; 123 } 124 125 address Method::get_i2c_entry() { 126 assert(_adapter != NULL, "must have"); 127 return _adapter->get_i2c_entry(); 128 } 129 130 address Method::get_c2i_entry() { 131 assert(_adapter != NULL, "must have"); 132 return _adapter->get_c2i_entry(); 133 } 134 135 address Method::get_c2i_unverified_entry() { 136 assert(_adapter != NULL, "must have"); 137 return _adapter->get_c2i_unverified_entry(); 138 } 139 140 char* Method::name_and_sig_as_C_string() const { 141 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 142 } 143 144 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 145 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 146 } 147 148 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 149 const char* klass_name = klass->external_name(); 150 int klass_name_len = (int)strlen(klass_name); 151 int method_name_len = method_name->utf8_length(); 152 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 153 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 154 strcpy(dest, klass_name); 155 dest[klass_name_len] = '.'; 156 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 157 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 158 dest[len] = 0; 159 return dest; 160 } 161 162 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 163 Symbol* klass_name = klass->name(); 164 klass_name->as_klass_external_name(buf, size); 165 int len = (int)strlen(buf); 166 167 if (len < size - 1) { 168 buf[len++] = '.'; 169 170 method_name->as_C_string(&(buf[len]), size - len); 171 len = (int)strlen(buf); 172 173 signature->as_C_string(&(buf[len]), size - len); 174 } 175 176 return buf; 177 } 178 179 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) { 180 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 181 // access exception table 182 ExceptionTable table(mh()); 183 int length = table.length(); 184 // iterate through all entries sequentially 185 constantPoolHandle pool(THREAD, mh->constants()); 186 for (int i = 0; i < length; i ++) { 187 //reacquire the table in case a GC happened 188 ExceptionTable table(mh()); 189 int beg_bci = table.start_pc(i); 190 int end_bci = table.end_pc(i); 191 assert(beg_bci <= end_bci, "inconsistent exception table"); 192 if (beg_bci <= throw_bci && throw_bci < end_bci) { 193 // exception handler bci range covers throw_bci => investigate further 194 int handler_bci = table.handler_pc(i); 195 int klass_index = table.catch_type_index(i); 196 if (klass_index == 0) { 197 return handler_bci; 198 } else if (ex_klass.is_null()) { 199 return handler_bci; 200 } else { 201 // we know the exception class => get the constraint class 202 // this may require loading of the constraint class; if verification 203 // fails or some other exception occurs, return handler_bci 204 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); 205 KlassHandle klass = KlassHandle(THREAD, k); 206 assert(klass.not_null(), "klass not loaded"); 207 if (ex_klass->is_subtype_of(klass())) { 208 return handler_bci; 209 } 210 } 211 } 212 } 213 214 return -1; 215 } 216 217 void Method::mask_for(int bci, InterpreterOopMap* mask) { 218 219 Thread* myThread = Thread::current(); 220 methodHandle h_this(myThread, this); 221 #ifdef ASSERT 222 bool has_capability = myThread->is_VM_thread() || 223 myThread->is_ConcurrentGC_thread() || 224 myThread->is_GC_task_thread(); 225 226 if (!has_capability) { 227 if (!VerifyStack && !VerifyLastFrame) { 228 // verify stack calls this outside VM thread 229 warning("oopmap should only be accessed by the " 230 "VM, GC task or CMS threads (or during debugging)"); 231 InterpreterOopMap local_mask; 232 method_holder()->mask_for(h_this, bci, &local_mask); 233 local_mask.print(); 234 } 235 } 236 #endif 237 method_holder()->mask_for(h_this, bci, mask); 238 return; 239 } 240 241 242 int Method::bci_from(address bcp) const { 243 if (is_native() && bcp == 0) { 244 return 0; 245 } 246 #ifdef ASSERT 247 { ResourceMark rm; 248 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), 249 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string())); 250 } 251 #endif 252 return bcp - code_base(); 253 } 254 255 256 int Method::validate_bci(int bci) const { 257 return (bci == 0 || bci < code_size()) ? bci : -1; 258 } 259 260 // Return bci if it appears to be a valid bcp 261 // Return -1 otherwise. 262 // Used by profiling code, when invalid data is a possibility. 263 // The caller is responsible for validating the Method* itself. 264 int Method::validate_bci_from_bcp(address bcp) const { 265 // keep bci as -1 if not a valid bci 266 int bci = -1; 267 if (bcp == 0 || bcp == code_base()) { 268 // code_size() may return 0 and we allow 0 here 269 // the method may be native 270 bci = 0; 271 } else if (contains(bcp)) { 272 bci = bcp - code_base(); 273 } 274 // Assert that if we have dodged any asserts, bci is negative. 275 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 276 return bci; 277 } 278 279 address Method::bcp_from(int bci) const { 280 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), err_msg("illegal bci: %d", bci)); 281 address bcp = code_base() + bci; 282 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 283 return bcp; 284 } 285 286 address Method::bcp_from(address bcp) const { 287 if (is_native() && bcp == 0) { 288 return code_base() + (intptr_t)bcp; 289 } else { 290 return bcp; 291 } 292 } 293 294 int Method::size(bool is_native) { 295 // If native, then include pointers for native_function and signature_handler 296 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 297 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; 298 return align_object_size(header_size() + extra_words); 299 } 300 301 302 Symbol* Method::klass_name() const { 303 Klass* k = method_holder(); 304 assert(k->is_klass(), "must be klass"); 305 InstanceKlass* ik = (InstanceKlass*) k; 306 return ik->name(); 307 } 308 309 310 // Attempt to return method oop to original state. Clear any pointers 311 // (to objects outside the shared spaces). We won't be able to predict 312 // where they should point in a new JVM. Further initialize some 313 // entries now in order allow them to be write protected later. 314 315 void Method::remove_unshareable_info() { 316 unlink_method(); 317 } 318 319 320 bool Method::was_executed_more_than(int n) { 321 // Invocation counter is reset when the Method* is compiled. 322 // If the method has compiled code we therefore assume it has 323 // be excuted more than n times. 324 if (is_accessor() || is_empty_method() || (code() != NULL)) { 325 // interpreter doesn't bump invocation counter of trivial methods 326 // compiler does not bump invocation counter of compiled methods 327 return true; 328 } 329 else if ((method_counters() != NULL && 330 method_counters()->invocation_counter()->carry()) || 331 (method_data() != NULL && 332 method_data()->invocation_counter()->carry())) { 333 // The carry bit is set when the counter overflows and causes 334 // a compilation to occur. We don't know how many times 335 // the counter has been reset, so we simply assume it has 336 // been executed more than n times. 337 return true; 338 } else { 339 return invocation_count() > n; 340 } 341 } 342 343 void Method::print_invocation_count() { 344 if (is_static()) tty->print("static "); 345 if (is_final()) tty->print("final "); 346 if (is_synchronized()) tty->print("synchronized "); 347 if (is_native()) tty->print("native "); 348 tty->print("%s::", method_holder()->external_name()); 349 name()->print_symbol_on(tty); 350 signature()->print_symbol_on(tty); 351 352 if (WizardMode) { 353 // dump the size of the byte codes 354 tty->print(" {%d}", code_size()); 355 } 356 tty->cr(); 357 358 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 359 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 360 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 361 #ifndef PRODUCT 362 if (CountCompiledCalls) { 363 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 364 } 365 #endif 366 } 367 368 // Build a MethodData* object to hold information about this method 369 // collected in the interpreter. 370 void Method::build_interpreter_method_data(methodHandle method, TRAPS) { 371 // Do not profile method if current thread holds the pending list lock, 372 // which avoids deadlock for acquiring the MethodData_lock. 373 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) { 374 return; 375 } 376 377 // Grab a lock here to prevent multiple 378 // MethodData*s from being created. 379 MutexLocker ml(MethodData_lock, THREAD); 380 if (method->method_data() == NULL) { 381 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 382 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK); 383 method->set_method_data(method_data); 384 if (PrintMethodData && (Verbose || WizardMode)) { 385 ResourceMark rm(THREAD); 386 tty->print("build_interpreter_method_data for "); 387 method->print_name(tty); 388 tty->cr(); 389 // At the end of the run, the MDO, full of data, will be dumped. 390 } 391 } 392 } 393 394 MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 395 methodHandle mh(m); 396 ClassLoaderData* loader_data = mh->method_holder()->class_loader_data(); 397 MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL); 398 if (mh->method_counters() == NULL) { 399 mh->set_method_counters(counters); 400 } else { 401 MetadataFactory::free_metadata(loader_data, counters); 402 } 403 return mh->method_counters(); 404 } 405 406 void Method::cleanup_inline_caches() { 407 // The current system doesn't use inline caches in the interpreter 408 // => nothing to do (keep this method around for future use) 409 } 410 411 412 int Method::extra_stack_words() { 413 // not an inline function, to avoid a header dependency on Interpreter 414 return extra_stack_entries() * Interpreter::stackElementSize; 415 } 416 417 418 void Method::compute_size_of_parameters(Thread *thread) { 419 ArgumentSizeComputer asc(signature()); 420 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 421 } 422 423 #ifdef CC_INTERP 424 void Method::set_result_index(BasicType type) { 425 _result_index = Interpreter::BasicType_as_index(type); 426 } 427 #endif 428 429 BasicType Method::result_type() const { 430 ResultTypeFinder rtf(signature()); 431 return rtf.type(); 432 } 433 434 435 bool Method::is_empty_method() const { 436 return code_size() == 1 437 && *code_base() == Bytecodes::_return; 438 } 439 440 441 bool Method::is_vanilla_constructor() const { 442 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 443 // which only calls the superclass vanilla constructor and possibly does stores of 444 // zero constants to local fields: 445 // 446 // aload_0 447 // invokespecial 448 // indexbyte1 449 // indexbyte2 450 // 451 // followed by an (optional) sequence of: 452 // 453 // aload_0 454 // aconst_null / iconst_0 / fconst_0 / dconst_0 455 // putfield 456 // indexbyte1 457 // indexbyte2 458 // 459 // followed by: 460 // 461 // return 462 463 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 464 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 465 int size = code_size(); 466 // Check if size match 467 if (size == 0 || size % 5 != 0) return false; 468 address cb = code_base(); 469 int last = size - 1; 470 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 471 // Does not call superclass default constructor 472 return false; 473 } 474 // Check optional sequence 475 for (int i = 4; i < last; i += 5) { 476 if (cb[i] != Bytecodes::_aload_0) return false; 477 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 478 if (cb[i+2] != Bytecodes::_putfield) return false; 479 } 480 return true; 481 } 482 483 484 bool Method::compute_has_loops_flag() { 485 BytecodeStream bcs(this); 486 Bytecodes::Code bc; 487 488 while ((bc = bcs.next()) >= 0) { 489 switch( bc ) { 490 case Bytecodes::_ifeq: 491 case Bytecodes::_ifnull: 492 case Bytecodes::_iflt: 493 case Bytecodes::_ifle: 494 case Bytecodes::_ifne: 495 case Bytecodes::_ifnonnull: 496 case Bytecodes::_ifgt: 497 case Bytecodes::_ifge: 498 case Bytecodes::_if_icmpeq: 499 case Bytecodes::_if_icmpne: 500 case Bytecodes::_if_icmplt: 501 case Bytecodes::_if_icmpgt: 502 case Bytecodes::_if_icmple: 503 case Bytecodes::_if_icmpge: 504 case Bytecodes::_if_acmpeq: 505 case Bytecodes::_if_acmpne: 506 case Bytecodes::_goto: 507 case Bytecodes::_jsr: 508 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 509 break; 510 511 case Bytecodes::_goto_w: 512 case Bytecodes::_jsr_w: 513 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 514 break; 515 } 516 } 517 _access_flags.set_loops_flag_init(); 518 return _access_flags.has_loops(); 519 } 520 521 bool Method::is_final_method(AccessFlags class_access_flags) const { 522 // or "does_not_require_vtable_entry" 523 // default method or overpass can occur, is not final (reuses vtable entry) 524 // private methods get vtable entries for backward class compatibility. 525 if (is_overpass() || is_default_method()) return false; 526 return is_final() || class_access_flags.is_final(); 527 } 528 529 bool Method::is_final_method() const { 530 return is_final_method(method_holder()->access_flags()); 531 } 532 533 bool Method::is_default_method() const { 534 if (method_holder() != NULL && 535 method_holder()->is_interface() && 536 !is_abstract()) { 537 return true; 538 } else { 539 return false; 540 } 541 } 542 543 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 544 if (is_final_method(class_access_flags)) return true; 545 #ifdef ASSERT 546 ResourceMark rm; 547 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 548 if (class_access_flags.is_interface()) { 549 assert(is_nonv == is_static(), err_msg("is_nonv=%s", name_and_sig_as_C_string())); 550 } 551 #endif 552 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 553 return vtable_index() == nonvirtual_vtable_index; 554 } 555 556 bool Method::can_be_statically_bound() const { 557 return can_be_statically_bound(method_holder()->access_flags()); 558 } 559 560 bool Method::is_accessor() const { 561 if (code_size() != 5) return false; 562 if (size_of_parameters() != 1) return false; 563 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; 564 if (java_code_at(1) != Bytecodes::_getfield) return false; 565 if (java_code_at(4) != Bytecodes::_areturn && 566 java_code_at(4) != Bytecodes::_ireturn ) return false; 567 return true; 568 } 569 570 571 bool Method::is_initializer() const { 572 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); 573 } 574 575 bool Method::has_valid_initializer_flags() const { 576 return (is_static() || 577 method_holder()->major_version() < 51); 578 } 579 580 bool Method::is_static_initializer() const { 581 // For classfiles version 51 or greater, ensure that the clinit method is 582 // static. Non-static methods with the name "<clinit>" are not static 583 // initializers. (older classfiles exempted for backward compatibility) 584 return name() == vmSymbols::class_initializer_name() && 585 has_valid_initializer_flags(); 586 } 587 588 589 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 590 int length = method->checked_exceptions_length(); 591 if (length == 0) { // common case 592 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 593 } else { 594 methodHandle h_this(THREAD, method); 595 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 596 objArrayHandle mirrors (THREAD, m_oop); 597 for (int i = 0; i < length; i++) { 598 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 599 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 600 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 601 mirrors->obj_at_put(i, k->java_mirror()); 602 } 603 return mirrors; 604 } 605 }; 606 607 608 int Method::line_number_from_bci(int bci) const { 609 if (bci == SynchronizationEntryBCI) bci = 0; 610 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 611 int best_bci = 0; 612 int best_line = -1; 613 614 if (has_linenumber_table()) { 615 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 616 // Not necessarily sorted and not necessarily one-to-one. 617 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 618 while (stream.read_pair()) { 619 if (stream.bci() == bci) { 620 // perfect match 621 return stream.line(); 622 } else { 623 // update best_bci/line 624 if (stream.bci() < bci && stream.bci() >= best_bci) { 625 best_bci = stream.bci(); 626 best_line = stream.line(); 627 } 628 } 629 } 630 } 631 return best_line; 632 } 633 634 635 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 636 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 637 Thread *thread = Thread::current(); 638 Symbol* klass_name = constants()->klass_name_at(klass_index); 639 Handle loader(thread, method_holder()->class_loader()); 640 Handle prot (thread, method_holder()->protection_domain()); 641 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 642 } else { 643 return true; 644 } 645 } 646 647 648 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 649 int klass_index = constants()->klass_ref_index_at(refinfo_index); 650 if (must_be_resolved) { 651 // Make sure klass is resolved in constantpool. 652 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 653 } 654 return is_klass_loaded_by_klass_index(klass_index); 655 } 656 657 658 void Method::set_native_function(address function, bool post_event_flag) { 659 assert(function != NULL, "use clear_native_function to unregister natives"); 660 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 661 address* native_function = native_function_addr(); 662 663 // We can see racers trying to place the same native function into place. Once 664 // is plenty. 665 address current = *native_function; 666 if (current == function) return; 667 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 668 function != NULL) { 669 // native_method_throw_unsatisfied_link_error_entry() should only 670 // be passed when post_event_flag is false. 671 assert(function != 672 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 673 "post_event_flag mis-match"); 674 675 // post the bind event, and possible change the bind function 676 JvmtiExport::post_native_method_bind(this, &function); 677 } 678 *native_function = function; 679 // This function can be called more than once. We must make sure that we always 680 // use the latest registered method -> check if a stub already has been generated. 681 // If so, we have to make it not_entrant. 682 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 683 if (nm != NULL) { 684 nm->make_not_entrant(); 685 } 686 } 687 688 689 bool Method::has_native_function() const { 690 if (is_method_handle_intrinsic()) 691 return false; // special-cased in SharedRuntime::generate_native_wrapper 692 address func = native_function(); 693 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 694 } 695 696 697 void Method::clear_native_function() { 698 // Note: is_method_handle_intrinsic() is allowed here. 699 set_native_function( 700 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 701 !native_bind_event_is_interesting); 702 clear_code(); 703 } 704 705 address Method::critical_native_function() { 706 methodHandle mh(this); 707 return NativeLookup::lookup_critical_entry(mh); 708 } 709 710 711 void Method::set_signature_handler(address handler) { 712 address* signature_handler = signature_handler_addr(); 713 *signature_handler = handler; 714 } 715 716 717 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 718 if (PrintCompilation && report) { 719 ttyLocker ttyl; 720 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 721 if (comp_level == CompLevel_all) { 722 tty->print("all levels "); 723 } else { 724 tty->print("levels "); 725 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 726 tty->print("%d ", i); 727 } 728 } 729 this->print_short_name(tty); 730 int size = this->code_size(); 731 if (size > 0) { 732 tty->print(" (%d bytes)", size); 733 } 734 if (reason != NULL) { 735 tty->print(" %s", reason); 736 } 737 tty->cr(); 738 } 739 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 740 ttyLocker ttyl; 741 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 742 os::current_thread_id(), is_osr, comp_level); 743 if (reason != NULL) { 744 xtty->print(" reason=\'%s\'", reason); 745 } 746 xtty->method(this); 747 xtty->stamp(); 748 xtty->end_elem(); 749 } 750 } 751 752 bool Method::is_always_compilable() const { 753 // Generated adapters must be compiled 754 if (is_method_handle_intrinsic() && is_synthetic()) { 755 assert(!is_not_c1_compilable(), "sanity check"); 756 assert(!is_not_c2_compilable(), "sanity check"); 757 return true; 758 } 759 760 return false; 761 } 762 763 bool Method::is_not_compilable(int comp_level) const { 764 if (number_of_breakpoints() > 0) 765 return true; 766 if (is_always_compilable()) 767 return false; 768 if (comp_level == CompLevel_any) 769 return is_not_c1_compilable() || is_not_c2_compilable(); 770 if (is_c1_compile(comp_level)) 771 return is_not_c1_compilable(); 772 if (is_c2_compile(comp_level)) 773 return is_not_c2_compilable(); 774 return false; 775 } 776 777 // call this when compiler finds that this method is not compilable 778 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 779 if (is_always_compilable()) { 780 // Don't mark a method which should be always compilable 781 return; 782 } 783 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 784 if (comp_level == CompLevel_all) { 785 set_not_c1_compilable(); 786 set_not_c2_compilable(); 787 } else { 788 if (is_c1_compile(comp_level)) 789 set_not_c1_compilable(); 790 if (is_c2_compile(comp_level)) 791 set_not_c2_compilable(); 792 } 793 CompilationPolicy::policy()->disable_compilation(this); 794 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 795 } 796 797 bool Method::is_not_osr_compilable(int comp_level) const { 798 if (is_not_compilable(comp_level)) 799 return true; 800 if (comp_level == CompLevel_any) 801 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 802 if (is_c1_compile(comp_level)) 803 return is_not_c1_osr_compilable(); 804 if (is_c2_compile(comp_level)) 805 return is_not_c2_osr_compilable(); 806 return false; 807 } 808 809 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 810 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 811 if (comp_level == CompLevel_all) { 812 set_not_c1_osr_compilable(); 813 set_not_c2_osr_compilable(); 814 } else { 815 if (is_c1_compile(comp_level)) 816 set_not_c1_osr_compilable(); 817 if (is_c2_compile(comp_level)) 818 set_not_c2_osr_compilable(); 819 } 820 CompilationPolicy::policy()->disable_compilation(this); 821 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 822 } 823 824 // Revert to using the interpreter and clear out the nmethod 825 void Method::clear_code() { 826 827 // this may be NULL if c2i adapters have not been made yet 828 // Only should happen at allocate time. 829 if (_adapter == NULL) { 830 _from_compiled_entry = NULL; 831 } else { 832 _from_compiled_entry = _adapter->get_c2i_entry(); 833 } 834 OrderAccess::storestore(); 835 _from_interpreted_entry = _i2i_entry; 836 OrderAccess::storestore(); 837 _code = NULL; 838 } 839 840 // Called by class data sharing to remove any entry points (which are not shared) 841 void Method::unlink_method() { 842 _code = NULL; 843 _i2i_entry = NULL; 844 _from_interpreted_entry = NULL; 845 if (is_native()) { 846 *native_function_addr() = NULL; 847 set_signature_handler(NULL); 848 } 849 NOT_PRODUCT(set_compiled_invocation_count(0);) 850 _adapter = NULL; 851 _from_compiled_entry = NULL; 852 853 // In case of DumpSharedSpaces, _method_data should always be NULL. 854 // 855 // During runtime (!DumpSharedSpaces), when we are cleaning a 856 // shared class that failed to load, this->link_method() may 857 // have already been called (before an exception happened), so 858 // this->_method_data may not be NULL. 859 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?"); 860 861 set_method_data(NULL); 862 set_method_counters(NULL); 863 } 864 865 // Called when the method_holder is getting linked. Setup entrypoints so the method 866 // is ready to be called from interpreter, compiler, and vtables. 867 void Method::link_method(methodHandle h_method, TRAPS) { 868 // If the code cache is full, we may reenter this function for the 869 // leftover methods that weren't linked. 870 if (_i2i_entry != NULL) return; 871 872 assert(_adapter == NULL, "init'd to NULL" ); 873 assert( _code == NULL, "nothing compiled yet" ); 874 875 // Setup interpreter entrypoint 876 assert(this == h_method(), "wrong h_method()" ); 877 address entry = Interpreter::entry_for_method(h_method); 878 assert(entry != NULL, "interpreter entry must be non-null"); 879 // Sets both _i2i_entry and _from_interpreted_entry 880 set_interpreter_entry(entry); 881 882 // Don't overwrite already registered native entries. 883 if (is_native() && !has_native_function()) { 884 set_native_function( 885 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 886 !native_bind_event_is_interesting); 887 } 888 889 // Setup compiler entrypoint. This is made eagerly, so we do not need 890 // special handling of vtables. An alternative is to make adapters more 891 // lazily by calling make_adapter() from from_compiled_entry() for the 892 // normal calls. For vtable calls life gets more complicated. When a 893 // call-site goes mega-morphic we need adapters in all methods which can be 894 // called from the vtable. We need adapters on such methods that get loaded 895 // later. Ditto for mega-morphic itable calls. If this proves to be a 896 // problem we'll make these lazily later. 897 (void) make_adapters(h_method, CHECK); 898 899 // ONLY USE the h_method now as make_adapter may have blocked 900 901 } 902 903 address Method::make_adapters(methodHandle mh, TRAPS) { 904 // Adapters for compiled code are made eagerly here. They are fairly 905 // small (generally < 100 bytes) and quick to make (and cached and shared) 906 // so making them eagerly shouldn't be too expensive. 907 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 908 if (adapter == NULL ) { 909 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); 910 } 911 912 mh->set_adapter_entry(adapter); 913 mh->_from_compiled_entry = adapter->get_c2i_entry(); 914 return adapter->get_c2i_entry(); 915 } 916 917 void Method::restore_unshareable_info(TRAPS) { 918 // Since restore_unshareable_info can be called more than once for a method, don't 919 // redo any work. If this field is restored, there is nothing to do. 920 if (_from_compiled_entry == NULL) { 921 // restore method's vtable by calling a virtual function 922 restore_vtable(); 923 924 methodHandle mh(THREAD, this); 925 link_method(mh, CHECK); 926 } 927 } 928 929 930 // The verified_code_entry() must be called when a invoke is resolved 931 // on this method. 932 933 // It returns the compiled code entry point, after asserting not null. 934 // This function is called after potential safepoints so that nmethod 935 // or adapter that it points to is still live and valid. 936 // This function must not hit a safepoint! 937 address Method::verified_code_entry() { 938 debug_only(No_Safepoint_Verifier nsv;) 939 assert(_from_compiled_entry != NULL, "must be set"); 940 return _from_compiled_entry; 941 } 942 943 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 944 // (could be racing a deopt). 945 // Not inline to avoid circular ref. 946 bool Method::check_code() const { 947 // cached in a register or local. There's a race on the value of the field. 948 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 949 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 950 } 951 952 // Install compiled code. Instantly it can execute. 953 void Method::set_code(methodHandle mh, nmethod *code) { 954 assert( code, "use clear_code to remove code" ); 955 assert( mh->check_code(), "" ); 956 957 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 958 959 // These writes must happen in this order, because the interpreter will 960 // directly jump to from_interpreted_entry which jumps to an i2c adapter 961 // which jumps to _from_compiled_entry. 962 mh->_code = code; // Assign before allowing compiled code to exec 963 964 int comp_level = code->comp_level(); 965 // In theory there could be a race here. In practice it is unlikely 966 // and not worth worrying about. 967 if (comp_level > mh->highest_comp_level()) { 968 mh->set_highest_comp_level(comp_level); 969 } 970 971 OrderAccess::storestore(); 972 #ifdef SHARK 973 mh->_from_interpreted_entry = code->insts_begin(); 974 #else //!SHARK 975 mh->_from_compiled_entry = code->verified_entry_point(); 976 OrderAccess::storestore(); 977 // Instantly compiled code can execute. 978 if (!mh->is_method_handle_intrinsic()) 979 mh->_from_interpreted_entry = mh->get_i2c_entry(); 980 #endif //!SHARK 981 } 982 983 984 bool Method::is_overridden_in(Klass* k) const { 985 InstanceKlass* ik = InstanceKlass::cast(k); 986 987 if (ik->is_interface()) return false; 988 989 // If method is an interface, we skip it - except if it 990 // is a miranda method 991 if (method_holder()->is_interface()) { 992 // Check that method is not a miranda method 993 if (ik->lookup_method(name(), signature()) == NULL) { 994 // No implementation exist - so miranda method 995 return false; 996 } 997 return true; 998 } 999 1000 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1001 assert(ik->vtable() != NULL, "vtable should exist"); 1002 if (!has_vtable_index()) { 1003 return false; 1004 } else { 1005 Method* vt_m = ik->method_at_vtable(vtable_index()); 1006 return vt_m != this; 1007 } 1008 } 1009 1010 1011 // give advice about whether this Method* should be cached or not 1012 bool Method::should_not_be_cached() const { 1013 if (is_old()) { 1014 // This method has been redefined. It is either EMCP or obsolete 1015 // and we don't want to cache it because that would pin the method 1016 // down and prevent it from being collectible if and when it 1017 // finishes executing. 1018 return true; 1019 } 1020 1021 // caching this method should be just fine 1022 return false; 1023 } 1024 1025 1026 /** 1027 * Returns true if this is one of the specially treated methods for 1028 * security related stack walks (like Reflection.getCallerClass). 1029 */ 1030 bool Method::is_ignored_by_security_stack_walk() const { 1031 if (intrinsic_id() == vmIntrinsics::_invoke) { 1032 // This is Method.invoke() -- ignore it 1033 return true; 1034 } 1035 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1036 // This is an auxilary frame -- ignore it 1037 return true; 1038 } 1039 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1040 // This is an internal adapter frame for method handles -- ignore it 1041 return true; 1042 } 1043 return false; 1044 } 1045 1046 1047 // Constant pool structure for invoke methods: 1048 enum { 1049 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1050 _imcp_invoke_signature, // utf8: (variable Symbol*) 1051 _imcp_limit 1052 }; 1053 1054 // Test if this method is an MH adapter frame generated by Java code. 1055 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1056 bool Method::is_compiled_lambda_form() const { 1057 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1058 } 1059 1060 // Test if this method is an internal MH primitive method. 1061 bool Method::is_method_handle_intrinsic() const { 1062 vmIntrinsics::ID iid = intrinsic_id(); 1063 return (MethodHandles::is_signature_polymorphic(iid) && 1064 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1065 } 1066 1067 bool Method::has_member_arg() const { 1068 vmIntrinsics::ID iid = intrinsic_id(); 1069 return (MethodHandles::is_signature_polymorphic(iid) && 1070 MethodHandles::has_member_arg(iid)); 1071 } 1072 1073 // Make an instance of a signature-polymorphic internal MH primitive. 1074 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1075 Symbol* signature, 1076 TRAPS) { 1077 ResourceMark rm; 1078 methodHandle empty; 1079 1080 KlassHandle holder = SystemDictionary::MethodHandle_klass(); 1081 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1082 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1083 if (TraceMethodHandles) { 1084 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1085 } 1086 1087 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1088 name->increment_refcount(); 1089 signature->increment_refcount(); 1090 1091 int cp_length = _imcp_limit; 1092 ClassLoaderData* loader_data = holder->class_loader_data(); 1093 constantPoolHandle cp; 1094 { 1095 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1096 cp = constantPoolHandle(THREAD, cp_oop); 1097 } 1098 cp->set_pool_holder(InstanceKlass::cast(holder())); 1099 cp->symbol_at_put(_imcp_invoke_name, name); 1100 cp->symbol_at_put(_imcp_invoke_signature, signature); 1101 cp->set_has_preresolution(); 1102 1103 // decide on access bits: public or not? 1104 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1105 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1106 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1107 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1108 1109 methodHandle m; 1110 { 1111 InlineTableSizes sizes; 1112 Method* m_oop = Method::allocate(loader_data, 0, 1113 accessFlags_from(flags_bits), &sizes, 1114 ConstMethod::NORMAL, CHECK_(empty)); 1115 m = methodHandle(THREAD, m_oop); 1116 } 1117 m->set_constants(cp()); 1118 m->set_name_index(_imcp_invoke_name); 1119 m->set_signature_index(_imcp_invoke_signature); 1120 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1121 assert(m->signature() == signature, ""); 1122 #ifdef CC_INTERP 1123 ResultTypeFinder rtf(signature); 1124 m->set_result_index(rtf.type()); 1125 #endif 1126 m->compute_size_of_parameters(THREAD); 1127 m->init_intrinsic_id(); 1128 assert(m->is_method_handle_intrinsic(), ""); 1129 #ifdef ASSERT 1130 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1131 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1132 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1133 #endif //ASSERT 1134 1135 // Finally, set up its entry points. 1136 assert(m->can_be_statically_bound(), ""); 1137 m->set_vtable_index(Method::nonvirtual_vtable_index); 1138 m->link_method(m, CHECK_(empty)); 1139 1140 if (TraceMethodHandles && (Verbose || WizardMode)) 1141 m->print_on(tty); 1142 1143 return m; 1144 } 1145 1146 Klass* Method::check_non_bcp_klass(Klass* klass) { 1147 if (klass != NULL && klass->class_loader() != NULL) { 1148 if (klass->oop_is_objArray()) 1149 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1150 return klass; 1151 } 1152 return NULL; 1153 } 1154 1155 1156 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1157 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1158 // Code below does not work for native methods - they should never get rewritten anyway 1159 assert(!m->is_native(), "cannot rewrite native methods"); 1160 // Allocate new Method* 1161 AccessFlags flags = m->access_flags(); 1162 1163 ConstMethod* cm = m->constMethod(); 1164 int checked_exceptions_len = cm->checked_exceptions_length(); 1165 int localvariable_len = cm->localvariable_table_length(); 1166 int exception_table_len = cm->exception_table_length(); 1167 int method_parameters_len = cm->method_parameters_length(); 1168 int method_annotations_len = cm->method_annotations_length(); 1169 int parameter_annotations_len = cm->parameter_annotations_length(); 1170 int type_annotations_len = cm->type_annotations_length(); 1171 int default_annotations_len = cm->default_annotations_length(); 1172 1173 InlineTableSizes sizes( 1174 localvariable_len, 1175 new_compressed_linenumber_size, 1176 exception_table_len, 1177 checked_exceptions_len, 1178 method_parameters_len, 1179 cm->generic_signature_index(), 1180 method_annotations_len, 1181 parameter_annotations_len, 1182 type_annotations_len, 1183 default_annotations_len, 1184 0); 1185 1186 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1187 Method* newm_oop = Method::allocate(loader_data, 1188 new_code_length, 1189 flags, 1190 &sizes, 1191 m->method_type(), 1192 CHECK_(methodHandle())); 1193 methodHandle newm (THREAD, newm_oop); 1194 int new_method_size = newm->method_size(); 1195 1196 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1197 ConstMethod* newcm = newm->constMethod(); 1198 int new_const_method_size = newm->constMethod()->size(); 1199 1200 memcpy(newm(), m(), sizeof(Method)); 1201 1202 // Create shallow copy of ConstMethod. 1203 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1204 1205 // Reset correct method/const method, method size, and parameter info 1206 newm->set_constMethod(newcm); 1207 newm->constMethod()->set_code_size(new_code_length); 1208 newm->constMethod()->set_constMethod_size(new_const_method_size); 1209 newm->set_method_size(new_method_size); 1210 assert(newm->code_size() == new_code_length, "check"); 1211 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1212 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1213 assert(newm->exception_table_length() == exception_table_len, "check"); 1214 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1215 // Copy new byte codes 1216 memcpy(newm->code_base(), new_code, new_code_length); 1217 // Copy line number table 1218 if (new_compressed_linenumber_size > 0) { 1219 memcpy(newm->compressed_linenumber_table(), 1220 new_compressed_linenumber_table, 1221 new_compressed_linenumber_size); 1222 } 1223 // Copy method_parameters 1224 if (method_parameters_len > 0) { 1225 memcpy(newm->method_parameters_start(), 1226 m->method_parameters_start(), 1227 method_parameters_len * sizeof(MethodParametersElement)); 1228 } 1229 // Copy checked_exceptions 1230 if (checked_exceptions_len > 0) { 1231 memcpy(newm->checked_exceptions_start(), 1232 m->checked_exceptions_start(), 1233 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1234 } 1235 // Copy exception table 1236 if (exception_table_len > 0) { 1237 memcpy(newm->exception_table_start(), 1238 m->exception_table_start(), 1239 exception_table_len * sizeof(ExceptionTableElement)); 1240 } 1241 // Copy local variable number table 1242 if (localvariable_len > 0) { 1243 memcpy(newm->localvariable_table_start(), 1244 m->localvariable_table_start(), 1245 localvariable_len * sizeof(LocalVariableTableElement)); 1246 } 1247 // Copy stackmap table 1248 if (m->has_stackmap_table()) { 1249 int code_attribute_length = m->stackmap_data()->length(); 1250 Array<u1>* stackmap_data = 1251 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1252 memcpy((void*)stackmap_data->adr_at(0), 1253 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1254 newm->set_stackmap_data(stackmap_data); 1255 } 1256 1257 // copy annotations over to new method 1258 newcm->copy_annotations_from(cm); 1259 return newm; 1260 } 1261 1262 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) { 1263 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1264 // because we are not loading from core libraries 1265 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1266 // which does not use the class default class loader so we check for its loader here 1267 InstanceKlass* ik = InstanceKlass::cast(holder); 1268 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) { 1269 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1270 } 1271 1272 // see if the klass name is well-known: 1273 Symbol* klass_name = ik->name(); 1274 return vmSymbols::find_sid(klass_name); 1275 } 1276 1277 void Method::init_intrinsic_id() { 1278 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1279 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1280 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1281 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1282 1283 // the klass name is well-known: 1284 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1285 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1286 1287 // ditto for method and signature: 1288 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1289 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1290 && name_id == vmSymbols::NO_SID) 1291 return; 1292 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1293 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1294 && sig_id == vmSymbols::NO_SID) return; 1295 jshort flags = access_flags().as_short(); 1296 1297 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1298 if (id != vmIntrinsics::_none) { 1299 set_intrinsic_id(id); 1300 return; 1301 } 1302 1303 // A few slightly irregular cases: 1304 switch (klass_id) { 1305 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1306 // Second chance: check in regular Math. 1307 switch (name_id) { 1308 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1309 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1310 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1311 // pretend it is the corresponding method in the non-strict class: 1312 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1313 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1314 break; 1315 } 1316 break; 1317 1318 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. 1319 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1320 if (!is_native()) break; 1321 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1322 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1323 id = vmIntrinsics::_none; 1324 break; 1325 } 1326 1327 if (id != vmIntrinsics::_none) { 1328 // Set up its iid. It is an alias method. 1329 set_intrinsic_id(id); 1330 return; 1331 } 1332 } 1333 1334 // These two methods are static since a GC may move the Method 1335 bool Method::load_signature_classes(methodHandle m, TRAPS) { 1336 if (THREAD->is_Compiler_thread()) { 1337 // There is nothing useful this routine can do from within the Compile thread. 1338 // Hopefully, the signature contains only well-known classes. 1339 // We could scan for this and return true/false, but the caller won't care. 1340 return false; 1341 } 1342 bool sig_is_loaded = true; 1343 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1344 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1345 ResourceMark rm(THREAD); 1346 Symbol* signature = m->signature(); 1347 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1348 if (ss.is_object()) { 1349 Symbol* sym = ss.as_symbol(CHECK_(false)); 1350 Symbol* name = sym; 1351 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1352 protection_domain, THREAD); 1353 // We are loading classes eagerly. If a ClassNotFoundException or 1354 // a LinkageError was generated, be sure to ignore it. 1355 if (HAS_PENDING_EXCEPTION) { 1356 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1357 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1358 CLEAR_PENDING_EXCEPTION; 1359 } else { 1360 return false; 1361 } 1362 } 1363 if( klass == NULL) { sig_is_loaded = false; } 1364 } 1365 } 1366 return sig_is_loaded; 1367 } 1368 1369 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1370 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1371 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1372 ResourceMark rm(THREAD); 1373 Symbol* signature = m->signature(); 1374 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1375 if (ss.type() == T_OBJECT) { 1376 Symbol* name = ss.as_symbol_or_null(); 1377 if (name == NULL) return true; 1378 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1379 if (klass == NULL) return true; 1380 } 1381 } 1382 return false; 1383 } 1384 1385 // Exposed so field engineers can debug VM 1386 void Method::print_short_name(outputStream* st) { 1387 ResourceMark rm; 1388 #ifdef PRODUCT 1389 st->print(" %s::", method_holder()->external_name()); 1390 #else 1391 st->print(" %s::", method_holder()->internal_name()); 1392 #endif 1393 name()->print_symbol_on(st); 1394 if (WizardMode) signature()->print_symbol_on(st); 1395 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1396 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1397 } 1398 1399 // Comparer for sorting an object array containing 1400 // Method*s. 1401 static int method_comparator(Method* a, Method* b) { 1402 return a->name()->fast_compare(b->name()); 1403 } 1404 1405 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1406 // default_methods also uses this without the ordering for fast find_method 1407 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) { 1408 int length = methods->length(); 1409 if (length > 1) { 1410 { 1411 No_Safepoint_Verifier nsv; 1412 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); 1413 } 1414 // Reset method ordering 1415 if (set_idnums) { 1416 for (int i = 0; i < length; i++) { 1417 Method* m = methods->at(i); 1418 m->set_method_idnum(i); 1419 } 1420 } 1421 } 1422 } 1423 1424 //----------------------------------------------------------------------------------- 1425 // Non-product code unless JVM/TI needs it 1426 1427 #if !defined(PRODUCT) || INCLUDE_JVMTI 1428 class SignatureTypePrinter : public SignatureTypeNames { 1429 private: 1430 outputStream* _st; 1431 bool _use_separator; 1432 1433 void type_name(const char* name) { 1434 if (_use_separator) _st->print(", "); 1435 _st->print("%s", name); 1436 _use_separator = true; 1437 } 1438 1439 public: 1440 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1441 _st = st; 1442 _use_separator = false; 1443 } 1444 1445 void print_parameters() { _use_separator = false; iterate_parameters(); } 1446 void print_returntype() { _use_separator = false; iterate_returntype(); } 1447 }; 1448 1449 1450 void Method::print_name(outputStream* st) { 1451 Thread *thread = Thread::current(); 1452 ResourceMark rm(thread); 1453 SignatureTypePrinter sig(signature(), st); 1454 st->print("%s ", is_static() ? "static" : "virtual"); 1455 sig.print_returntype(); 1456 st->print(" %s.", method_holder()->internal_name()); 1457 name()->print_symbol_on(st); 1458 st->print("("); 1459 sig.print_parameters(); 1460 st->print(")"); 1461 } 1462 #endif // !PRODUCT || INCLUDE_JVMTI 1463 1464 1465 void Method::print_codes_on(outputStream* st) const { 1466 print_codes_on(0, code_size(), st); 1467 } 1468 1469 void Method::print_codes_on(int from, int to, outputStream* st) const { 1470 Thread *thread = Thread::current(); 1471 ResourceMark rm(thread); 1472 methodHandle mh (thread, (Method*)this); 1473 BytecodeStream s(mh); 1474 s.set_interval(from, to); 1475 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1476 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1477 } 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 MethodData* mdo = method_data(); 1639 if (mdo != NULL) { 1640 return mdo->highest_comp_level(); 1641 } else { 1642 return CompLevel_none; 1643 } 1644 } 1645 1646 int Method::highest_osr_comp_level() const { 1647 const MethodData* mdo = method_data(); 1648 if (mdo != NULL) { 1649 return mdo->highest_osr_comp_level(); 1650 } else { 1651 return CompLevel_none; 1652 } 1653 } 1654 1655 void Method::set_highest_comp_level(int level) { 1656 MethodData* mdo = method_data(); 1657 if (mdo != NULL) { 1658 mdo->set_highest_comp_level(level); 1659 } 1660 } 1661 1662 void Method::set_highest_osr_comp_level(int level) { 1663 MethodData* mdo = method_data(); 1664 if (mdo != NULL) { 1665 mdo->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 1777 // During class unloading the methods are cleared, which is different 1778 // than freed. 1779 void clear_all_methods() { 1780 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1781 for (int i = 0; i< number_of_methods; i++) { 1782 _methods[i] = NULL; 1783 } 1784 } 1785 } 1786 #ifndef PRODUCT 1787 int count_methods() { 1788 // count all allocated methods 1789 int count = 0; 1790 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { 1791 for (int i = 0; i< number_of_methods; i++) { 1792 if (_methods[i] != _free_method) count++; 1793 } 1794 } 1795 return count; 1796 } 1797 #endif // PRODUCT 1798 }; 1799 1800 // Something that can't be mistaken for an address or a markOop 1801 Method* const JNIMethodBlock::_free_method = (Method*)55; 1802 1803 // Add a method id to the jmethod_ids 1804 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 1805 ClassLoaderData* cld = loader_data; 1806 1807 if (!SafepointSynchronize::is_at_safepoint()) { 1808 // Have to add jmethod_ids() to class loader data thread-safely. 1809 // Also have to add the method to the list safely, which the cld lock 1810 // protects as well. 1811 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 1812 if (cld->jmethod_ids() == NULL) { 1813 cld->set_jmethod_ids(new JNIMethodBlock()); 1814 } 1815 // jmethodID is a pointer to Method* 1816 return (jmethodID)cld->jmethod_ids()->add_method(m); 1817 } else { 1818 // At safepoint, we are single threaded and can set this. 1819 if (cld->jmethod_ids() == NULL) { 1820 cld->set_jmethod_ids(new JNIMethodBlock()); 1821 } 1822 // jmethodID is a pointer to Method* 1823 return (jmethodID)cld->jmethod_ids()->add_method(m); 1824 } 1825 } 1826 1827 // Mark a jmethodID as free. This is called when there is a data race in 1828 // InstanceKlass while creating the jmethodID cache. 1829 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 1830 ClassLoaderData* cld = loader_data; 1831 Method** ptr = (Method**)m; 1832 assert(cld->jmethod_ids() != NULL, "should have method handles"); 1833 cld->jmethod_ids()->destroy_method(ptr); 1834 } 1835 1836 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 1837 // Can't assert the method_holder is the same because the new method has the 1838 // scratch method holder. 1839 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 1840 == new_method->method_holder()->class_loader(), 1841 "changing to a different class loader"); 1842 // Just change the method in place, jmethodID pointer doesn't change. 1843 *((Method**)jmid) = new_method; 1844 } 1845 1846 bool Method::is_method_id(jmethodID mid) { 1847 Method* m = resolve_jmethod_id(mid); 1848 assert(m != NULL, "should be called with non-null method"); 1849 InstanceKlass* ik = m->method_holder(); 1850 ClassLoaderData* cld = ik->class_loader_data(); 1851 if (cld->jmethod_ids() == NULL) return false; 1852 return (cld->jmethod_ids()->contains((Method**)mid)); 1853 } 1854 1855 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 1856 if (mid == NULL) return NULL; 1857 Method* o = resolve_jmethod_id(mid); 1858 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 1859 return NULL; 1860 } 1861 return o; 1862 }; 1863 1864 void Method::set_on_stack(const bool value) { 1865 // Set both the method itself and its constant pool. The constant pool 1866 // on stack means some method referring to it is also on the stack. 1867 _access_flags.set_on_stack(value); 1868 constants()->set_on_stack(value); 1869 if (value) MetadataOnStackMark::record(this); 1870 } 1871 1872 // Called when the class loader is unloaded to make all methods weak. 1873 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 1874 loader_data->jmethod_ids()->clear_all_methods(); 1875 } 1876 1877 bool Method::has_method_vptr(const void* ptr) { 1878 Method m; 1879 // This assumes that the vtbl pointer is the first word of a C++ object. 1880 // This assumption is also in universe.cpp patch_klass_vtble 1881 void* vtbl2 = dereference_vptr((const void*)&m); 1882 void* this_vtbl = dereference_vptr(ptr); 1883 return vtbl2 == this_vtbl; 1884 } 1885 1886 // Check that this pointer is valid by checking that the vtbl pointer matches 1887 bool Method::is_valid_method() const { 1888 if (this == NULL) { 1889 return false; 1890 } else if (!is_metaspace_object()) { 1891 return false; 1892 } else { 1893 return has_method_vptr((const void*)this); 1894 } 1895 } 1896 1897 #ifndef PRODUCT 1898 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 1899 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 1900 } 1901 #endif // PRODUCT 1902 1903 1904 // Printing 1905 1906 #ifndef PRODUCT 1907 1908 void Method::print_on(outputStream* st) const { 1909 ResourceMark rm; 1910 assert(is_method(), "must be method"); 1911 st->print_cr("%s", internal_name()); 1912 // get the effect of PrintOopAddress, always, for methods: 1913 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this); 1914 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 1915 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants()); 1916 constants()->print_value_on(st); st->cr(); 1917 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 1918 st->print (" - name: "); name()->print_value_on(st); st->cr(); 1919 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 1920 st->print_cr(" - max stack: %d", max_stack()); 1921 st->print_cr(" - max locals: %d", max_locals()); 1922 st->print_cr(" - size of params: %d", size_of_parameters()); 1923 st->print_cr(" - method size: %d", method_size()); 1924 if (intrinsic_id() != vmIntrinsics::_none) 1925 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 1926 if (highest_comp_level() != CompLevel_none) 1927 st->print_cr(" - highest level: %d", highest_comp_level()); 1928 st->print_cr(" - vtable index: %d", _vtable_index); 1929 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry()); 1930 st->print( " - adapters: "); 1931 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 1932 if (a == NULL) 1933 st->print_cr(INTPTR_FORMAT, a); 1934 else 1935 a->print_adapter_on(st); 1936 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry()); 1937 st->print_cr(" - code size: %d", code_size()); 1938 if (code_size() != 0) { 1939 st->print_cr(" - code start: " INTPTR_FORMAT, code_base()); 1940 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size()); 1941 } 1942 if (method_data() != NULL) { 1943 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data()); 1944 } 1945 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 1946 if (checked_exceptions_length() > 0) { 1947 CheckedExceptionElement* table = checked_exceptions_start(); 1948 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table); 1949 if (Verbose) { 1950 for (int i = 0; i < checked_exceptions_length(); i++) { 1951 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 1952 } 1953 } 1954 } 1955 if (has_linenumber_table()) { 1956 u_char* table = compressed_linenumber_table(); 1957 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table); 1958 if (Verbose) { 1959 CompressedLineNumberReadStream stream(table); 1960 while (stream.read_pair()) { 1961 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 1962 } 1963 } 1964 } 1965 st->print_cr(" - localvar length: %d", localvariable_table_length()); 1966 if (localvariable_table_length() > 0) { 1967 LocalVariableTableElement* table = localvariable_table_start(); 1968 st->print_cr(" - localvar start: " INTPTR_FORMAT, table); 1969 if (Verbose) { 1970 for (int i = 0; i < localvariable_table_length(); i++) { 1971 int bci = table[i].start_bci; 1972 int len = table[i].length; 1973 const char* name = constants()->printable_name_at(table[i].name_cp_index); 1974 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 1975 int slot = table[i].slot; 1976 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 1977 } 1978 } 1979 } 1980 if (code() != NULL) { 1981 st->print (" - compiled code: "); 1982 code()->print_value_on(st); 1983 } 1984 if (is_native()) { 1985 st->print_cr(" - native function: " INTPTR_FORMAT, native_function()); 1986 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler()); 1987 } 1988 } 1989 1990 #endif //PRODUCT 1991 1992 void Method::print_value_on(outputStream* st) const { 1993 assert(is_method(), "must be method"); 1994 st->print("%s", internal_name()); 1995 print_address_on(st); 1996 st->print(" "); 1997 name()->print_value_on(st); 1998 st->print(" "); 1999 signature()->print_value_on(st); 2000 st->print(" in "); 2001 method_holder()->print_value_on(st); 2002 if (WizardMode) st->print("#%d", _vtable_index); 2003 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2004 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2005 } 2006 2007 #if INCLUDE_SERVICES 2008 // Size Statistics 2009 void Method::collect_statistics(KlassSizeStats *sz) const { 2010 int mysize = sz->count(this); 2011 sz->_method_bytes += mysize; 2012 sz->_method_all_bytes += mysize; 2013 sz->_rw_bytes += mysize; 2014 2015 if (constMethod()) { 2016 constMethod()->collect_statistics(sz); 2017 } 2018 if (method_data()) { 2019 method_data()->collect_statistics(sz); 2020 } 2021 } 2022 #endif // INCLUDE_SERVICES 2023 2024 // Verification 2025 2026 void Method::verify_on(outputStream* st) { 2027 guarantee(is_method(), "object must be method"); 2028 guarantee(constants()->is_constantPool(), "should be constant pool"); 2029 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 2030 MethodData* md = method_data(); 2031 guarantee(md == NULL || 2032 md->is_methodData(), "should be method data"); 2033 }