1 /* 2 * Copyright (c) 1997, 2015, 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/codeCache.hpp" 29 #include "code/debugInfoRec.hpp" 30 #include "gc_interface/collectedHeap.inline.hpp" 31 #include "interpreter/bytecodeStream.hpp" 32 #include "interpreter/bytecodeTracer.hpp" 33 #include "interpreter/bytecodes.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "interpreter/oopMapCache.hpp" 36 #include "memory/gcLocker.hpp" 37 #include "memory/generation.hpp" 38 #include "memory/heapInspection.hpp" 39 #include "memory/metadataFactory.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 #ifdef CC_INTERP 89 set_result_index(T_VOID); 90 #endif 91 set_intrinsic_id(vmIntrinsics::_none); 92 set_jfr_towrite(false); 93 set_force_inline(false); 94 set_hidden(false); 95 set_dont_inline(false); 96 set_method_data(NULL); 97 clear_method_counters(); 98 set_vtable_index(Method::garbage_vtable_index); 99 100 // Fix and bury in Method* 101 set_interpreter_entry(NULL); // sets i2i entry and from_int 102 set_adapter_entry(NULL); 103 clear_code(); // from_c/from_i get set to c2i/i2i 104 105 if (access_flags.is_native()) { 106 clear_native_function(); 107 set_signature_handler(NULL); 108 } 109 110 NOT_PRODUCT(set_compiled_invocation_count(0);) 111 } 112 113 // Release Method*. The nmethod will be gone when we get here because 114 // we've walked the code cache. 115 void Method::deallocate_contents(ClassLoaderData* loader_data) { 116 MetadataFactory::free_metadata(loader_data, constMethod()); 117 set_constMethod(NULL); 118 MetadataFactory::free_metadata(loader_data, method_data()); 119 set_method_data(NULL); 120 MetadataFactory::free_metadata(loader_data, method_counters()); 121 clear_method_counters(); 122 // The nmethod will be gone when we get here. 123 if (code() != NULL) _code = NULL; 124 } 125 126 address Method::get_i2c_entry() { 127 assert(_adapter != NULL, "must have"); 128 return _adapter->get_i2c_entry(); 129 } 130 131 address Method::get_c2i_entry() { 132 assert(_adapter != NULL, "must have"); 133 return _adapter->get_c2i_entry(); 134 } 135 136 address Method::get_c2i_unverified_entry() { 137 assert(_adapter != NULL, "must have"); 138 return _adapter->get_c2i_unverified_entry(); 139 } 140 141 char* Method::name_and_sig_as_C_string() const { 142 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 143 } 144 145 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 146 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 147 } 148 149 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 150 const char* klass_name = klass->external_name(); 151 int klass_name_len = (int)strlen(klass_name); 152 int method_name_len = method_name->utf8_length(); 153 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 154 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 155 strcpy(dest, klass_name); 156 dest[klass_name_len] = '.'; 157 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 158 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 159 dest[len] = 0; 160 return dest; 161 } 162 163 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 164 Symbol* klass_name = klass->name(); 165 klass_name->as_klass_external_name(buf, size); 166 int len = (int)strlen(buf); 167 168 if (len < size - 1) { 169 buf[len++] = '.'; 170 171 method_name->as_C_string(&(buf[len]), size - len); 172 len = (int)strlen(buf); 173 174 signature->as_C_string(&(buf[len]), size - len); 175 } 176 177 return buf; 178 } 179 180 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) { 181 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 182 // access exception table 183 ExceptionTable table(mh()); 184 int length = table.length(); 185 // iterate through all entries sequentially 186 constantPoolHandle pool(THREAD, mh->constants()); 187 for (int i = 0; i < length; i ++) { 188 //reacquire the table in case a GC happened 189 ExceptionTable table(mh()); 190 int beg_bci = table.start_pc(i); 191 int end_bci = table.end_pc(i); 192 assert(beg_bci <= end_bci, "inconsistent exception table"); 193 if (beg_bci <= throw_bci && throw_bci < end_bci) { 194 // exception handler bci range covers throw_bci => investigate further 195 int handler_bci = table.handler_pc(i); 196 int klass_index = table.catch_type_index(i); 197 if (klass_index == 0) { 198 return handler_bci; 199 } else if (ex_klass.is_null()) { 200 return handler_bci; 201 } else { 202 // we know the exception class => get the constraint class 203 // this may require loading of the constraint class; if verification 204 // fails or some other exception occurs, return handler_bci 205 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); 206 KlassHandle klass = KlassHandle(THREAD, k); 207 assert(klass.not_null(), "klass not loaded"); 208 if (ex_klass->is_subtype_of(klass())) { 209 return handler_bci; 210 } 211 } 212 } 213 } 214 215 return -1; 216 } 217 218 void Method::mask_for(int bci, InterpreterOopMap* mask) { 219 220 Thread* myThread = Thread::current(); 221 methodHandle h_this(myThread, this); 222 #ifdef ASSERT 223 bool has_capability = myThread->is_VM_thread() || 224 myThread->is_ConcurrentGC_thread() || 225 myThread->is_GC_task_thread(); 226 227 if (!has_capability) { 228 if (!VerifyStack && !VerifyLastFrame) { 229 // verify stack calls this outside VM thread 230 warning("oopmap should only be accessed by the " 231 "VM, GC task or CMS threads (or during debugging)"); 232 InterpreterOopMap local_mask; 233 method_holder()->mask_for(h_this, bci, &local_mask); 234 local_mask.print(); 235 } 236 } 237 #endif 238 method_holder()->mask_for(h_this, bci, mask); 239 return; 240 } 241 242 243 int Method::bci_from(address bcp) const { 244 if (is_native() && bcp == 0) { 245 return 0; 246 } 247 #ifdef ASSERT 248 { ResourceMark rm; 249 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), 250 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string())); 251 } 252 #endif 253 return bcp - code_base(); 254 } 255 256 257 int Method::validate_bci(int bci) const { 258 return (bci == 0 || bci < code_size()) ? bci : -1; 259 } 260 261 // Return bci if it appears to be a valid bcp 262 // Return -1 otherwise. 263 // Used by profiling code, when invalid data is a possibility. 264 // The caller is responsible for validating the Method* itself. 265 int Method::validate_bci_from_bcp(address bcp) const { 266 // keep bci as -1 if not a valid bci 267 int bci = -1; 268 if (bcp == 0 || bcp == code_base()) { 269 // code_size() may return 0 and we allow 0 here 270 // the method may be native 271 bci = 0; 272 } else if (contains(bcp)) { 273 bci = bcp - code_base(); 274 } 275 // Assert that if we have dodged any asserts, bci is negative. 276 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 277 return bci; 278 } 279 280 address Method::bcp_from(int bci) const { 281 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), err_msg("illegal bci: %d", bci)); 282 address bcp = code_base() + bci; 283 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 284 return bcp; 285 } 286 287 address Method::bcp_from(address bcp) const { 288 if (is_native() && bcp == NULL) { 289 return code_base(); 290 } else { 291 return bcp; 292 } 293 } 294 295 int Method::size(bool is_native) { 296 // If native, then include pointers for native_function and signature_handler 297 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 298 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; 299 return align_object_size(header_size() + extra_words); 300 } 301 302 303 Symbol* Method::klass_name() const { 304 Klass* k = method_holder(); 305 assert(k->is_klass(), "must be klass"); 306 InstanceKlass* ik = (InstanceKlass*) k; 307 return ik->name(); 308 } 309 310 311 // Attempt to return method oop to original state. Clear any pointers 312 // (to objects outside the shared spaces). We won't be able to predict 313 // where they should point in a new JVM. Further initialize some 314 // entries now in order allow them to be write protected later. 315 316 void Method::remove_unshareable_info() { 317 unlink_method(); 318 } 319 320 321 bool Method::was_executed_more_than(int n) { 322 // Invocation counter is reset when the Method* is compiled. 323 // If the method has compiled code we therefore assume it has 324 // be excuted more than n times. 325 if (is_accessor() || is_empty_method() || (code() != NULL)) { 326 // interpreter doesn't bump invocation counter of trivial methods 327 // compiler does not bump invocation counter of compiled methods 328 return true; 329 } 330 else if ((method_counters() != NULL && 331 method_counters()->invocation_counter()->carry()) || 332 (method_data() != NULL && 333 method_data()->invocation_counter()->carry())) { 334 // The carry bit is set when the counter overflows and causes 335 // a compilation to occur. We don't know how many times 336 // the counter has been reset, so we simply assume it has 337 // been executed more than n times. 338 return true; 339 } else { 340 return invocation_count() > n; 341 } 342 } 343 344 void Method::print_invocation_count() { 345 if (is_static()) tty->print("static "); 346 if (is_final()) tty->print("final "); 347 if (is_synchronized()) tty->print("synchronized "); 348 if (is_native()) tty->print("native "); 349 tty->print("%s::", method_holder()->external_name()); 350 name()->print_symbol_on(tty); 351 signature()->print_symbol_on(tty); 352 353 if (WizardMode) { 354 // dump the size of the byte codes 355 tty->print(" {%d}", code_size()); 356 } 357 tty->cr(); 358 359 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 360 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 361 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 362 #ifndef PRODUCT 363 if (CountCompiledCalls) { 364 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 365 } 366 #endif 367 } 368 369 // Build a MethodData* object to hold information about this method 370 // collected in the interpreter. 371 void Method::build_interpreter_method_data(methodHandle method, TRAPS) { 372 // Do not profile the method if metaspace has hit an OOM previously 373 // allocating profiling data. Callers clear pending exception so don't 374 // add one here. 375 if (ClassLoaderDataGraph::has_metaspace_oom()) { 376 return; 377 } 378 379 // Do not profile method if current thread holds the pending list lock, 380 // which avoids deadlock for acquiring the MethodData_lock. 381 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) { 382 return; 383 } 384 385 // Grab a lock here to prevent multiple 386 // MethodData*s from being created. 387 MutexLocker ml(MethodData_lock, THREAD); 388 if (method->method_data() == NULL) { 389 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 390 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 391 if (HAS_PENDING_EXCEPTION) { 392 CompileBroker::log_metaspace_failure(); 393 ClassLoaderDataGraph::set_metaspace_oom(true); 394 return; // return the exception (which is cleared) 395 } 396 397 method->set_method_data(method_data); 398 if (PrintMethodData && (Verbose || WizardMode)) { 399 ResourceMark rm(THREAD); 400 tty->print("build_interpreter_method_data for "); 401 method->print_name(tty); 402 tty->cr(); 403 // At the end of the run, the MDO, full of data, will be dumped. 404 } 405 } 406 } 407 408 MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 409 // Do not profile the method if metaspace has hit an OOM previously 410 if (ClassLoaderDataGraph::has_metaspace_oom()) { 411 return NULL; 412 } 413 414 methodHandle mh(m); 415 MethodCounters* counters = MethodCounters::allocate(mh, THREAD); 416 if (HAS_PENDING_EXCEPTION) { 417 CompileBroker::log_metaspace_failure(); 418 ClassLoaderDataGraph::set_metaspace_oom(true); 419 return NULL; // return the exception (which is cleared) 420 } 421 if (!mh->init_method_counters(counters)) { 422 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 423 } 424 return mh->method_counters(); 425 } 426 427 void Method::cleanup_inline_caches() { 428 // The current system doesn't use inline caches in the interpreter 429 // => nothing to do (keep this method around for future use) 430 } 431 432 433 int Method::extra_stack_words() { 434 // not an inline function, to avoid a header dependency on Interpreter 435 return extra_stack_entries() * Interpreter::stackElementSize; 436 } 437 438 439 void Method::compute_size_of_parameters(Thread *thread) { 440 ArgumentSizeComputer asc(signature()); 441 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 442 } 443 444 #ifdef CC_INTERP 445 void Method::set_result_index(BasicType type) { 446 _result_index = Interpreter::BasicType_as_index(type); 447 } 448 #endif 449 450 BasicType Method::result_type() const { 451 ResultTypeFinder rtf(signature()); 452 return rtf.type(); 453 } 454 455 456 bool Method::is_empty_method() const { 457 return code_size() == 1 458 && *code_base() == Bytecodes::_return; 459 } 460 461 462 bool Method::is_vanilla_constructor() const { 463 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 464 // which only calls the superclass vanilla constructor and possibly does stores of 465 // zero constants to local fields: 466 // 467 // aload_0 468 // invokespecial 469 // indexbyte1 470 // indexbyte2 471 // 472 // followed by an (optional) sequence of: 473 // 474 // aload_0 475 // aconst_null / iconst_0 / fconst_0 / dconst_0 476 // putfield 477 // indexbyte1 478 // indexbyte2 479 // 480 // followed by: 481 // 482 // return 483 484 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 485 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 486 int size = code_size(); 487 // Check if size match 488 if (size == 0 || size % 5 != 0) return false; 489 address cb = code_base(); 490 int last = size - 1; 491 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 492 // Does not call superclass default constructor 493 return false; 494 } 495 // Check optional sequence 496 for (int i = 4; i < last; i += 5) { 497 if (cb[i] != Bytecodes::_aload_0) return false; 498 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 499 if (cb[i+2] != Bytecodes::_putfield) return false; 500 } 501 return true; 502 } 503 504 505 bool Method::compute_has_loops_flag() { 506 BytecodeStream bcs(this); 507 Bytecodes::Code bc; 508 509 while ((bc = bcs.next()) >= 0) { 510 switch( bc ) { 511 case Bytecodes::_ifeq: 512 case Bytecodes::_ifnull: 513 case Bytecodes::_iflt: 514 case Bytecodes::_ifle: 515 case Bytecodes::_ifne: 516 case Bytecodes::_ifnonnull: 517 case Bytecodes::_ifgt: 518 case Bytecodes::_ifge: 519 case Bytecodes::_if_icmpeq: 520 case Bytecodes::_if_icmpne: 521 case Bytecodes::_if_icmplt: 522 case Bytecodes::_if_icmpgt: 523 case Bytecodes::_if_icmple: 524 case Bytecodes::_if_icmpge: 525 case Bytecodes::_if_acmpeq: 526 case Bytecodes::_if_acmpne: 527 case Bytecodes::_goto: 528 case Bytecodes::_jsr: 529 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 530 break; 531 532 case Bytecodes::_goto_w: 533 case Bytecodes::_jsr_w: 534 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 535 break; 536 } 537 } 538 _access_flags.set_loops_flag_init(); 539 return _access_flags.has_loops(); 540 } 541 542 bool Method::is_final_method(AccessFlags class_access_flags) const { 543 // or "does_not_require_vtable_entry" 544 // default method or overpass can occur, is not final (reuses vtable entry) 545 // private methods get vtable entries for backward class compatibility. 546 if (is_overpass() || is_default_method()) return false; 547 return is_final() || class_access_flags.is_final(); 548 } 549 550 bool Method::is_final_method() const { 551 return is_final_method(method_holder()->access_flags()); 552 } 553 554 bool Method::is_default_method() const { 555 if (method_holder() != NULL && 556 method_holder()->is_interface() && 557 !is_abstract()) { 558 return true; 559 } else { 560 return false; 561 } 562 } 563 564 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 565 if (is_final_method(class_access_flags)) return true; 566 #ifdef ASSERT 567 ResourceMark rm; 568 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 569 if (class_access_flags.is_interface()) { 570 assert(is_nonv == is_static(), err_msg("is_nonv=%s", name_and_sig_as_C_string())); 571 } 572 #endif 573 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 574 return vtable_index() == nonvirtual_vtable_index; 575 } 576 577 bool Method::can_be_statically_bound() const { 578 return can_be_statically_bound(method_holder()->access_flags()); 579 } 580 581 bool Method::is_accessor() const { 582 if (code_size() != 5) return false; 583 if (size_of_parameters() != 1) return false; 584 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; 585 if (java_code_at(1) != Bytecodes::_getfield) return false; 586 if (java_code_at(4) != Bytecodes::_areturn && 587 java_code_at(4) != Bytecodes::_ireturn ) return false; 588 return true; 589 } 590 591 bool Method::is_constant_getter() const { 592 int last_index = code_size() - 1; 593 // Check if the first 1-3 bytecodes are a constant push 594 // and the last bytecode is a return. 595 return (2 <= code_size() && code_size() <= 4 && 596 Bytecodes::is_const(java_code_at(0)) && 597 Bytecodes::length_for(java_code_at(0)) == last_index && 598 Bytecodes::is_return(java_code_at(last_index))); 599 } 600 601 bool Method::is_initializer() const { 602 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); 603 } 604 605 bool Method::has_valid_initializer_flags() const { 606 return (is_static() || 607 method_holder()->major_version() < 51); 608 } 609 610 bool Method::is_static_initializer() const { 611 // For classfiles version 51 or greater, ensure that the clinit method is 612 // static. Non-static methods with the name "<clinit>" are not static 613 // initializers. (older classfiles exempted for backward compatibility) 614 return name() == vmSymbols::class_initializer_name() && 615 has_valid_initializer_flags(); 616 } 617 618 619 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 620 int length = method->checked_exceptions_length(); 621 if (length == 0) { // common case 622 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 623 } else { 624 methodHandle h_this(THREAD, method); 625 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 626 objArrayHandle mirrors (THREAD, m_oop); 627 for (int i = 0; i < length; i++) { 628 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 629 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 630 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 631 mirrors->obj_at_put(i, k->java_mirror()); 632 } 633 return mirrors; 634 } 635 }; 636 637 638 int Method::line_number_from_bci(int bci) const { 639 if (bci == SynchronizationEntryBCI) bci = 0; 640 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 641 int best_bci = 0; 642 int best_line = -1; 643 644 if (has_linenumber_table()) { 645 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 646 // Not necessarily sorted and not necessarily one-to-one. 647 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 648 while (stream.read_pair()) { 649 if (stream.bci() == bci) { 650 // perfect match 651 return stream.line(); 652 } else { 653 // update best_bci/line 654 if (stream.bci() < bci && stream.bci() >= best_bci) { 655 best_bci = stream.bci(); 656 best_line = stream.line(); 657 } 658 } 659 } 660 } 661 return best_line; 662 } 663 664 665 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 666 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 667 Thread *thread = Thread::current(); 668 Symbol* klass_name = constants()->klass_name_at(klass_index); 669 Handle loader(thread, method_holder()->class_loader()); 670 Handle prot (thread, method_holder()->protection_domain()); 671 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 672 } else { 673 return true; 674 } 675 } 676 677 678 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 679 int klass_index = constants()->klass_ref_index_at(refinfo_index); 680 if (must_be_resolved) { 681 // Make sure klass is resolved in constantpool. 682 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 683 } 684 return is_klass_loaded_by_klass_index(klass_index); 685 } 686 687 688 void Method::set_native_function(address function, bool post_event_flag) { 689 assert(function != NULL, "use clear_native_function to unregister natives"); 690 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 691 address* native_function = native_function_addr(); 692 693 // We can see racers trying to place the same native function into place. Once 694 // is plenty. 695 address current = *native_function; 696 if (current == function) return; 697 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 698 function != NULL) { 699 // native_method_throw_unsatisfied_link_error_entry() should only 700 // be passed when post_event_flag is false. 701 assert(function != 702 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 703 "post_event_flag mis-match"); 704 705 // post the bind event, and possible change the bind function 706 JvmtiExport::post_native_method_bind(this, &function); 707 } 708 *native_function = function; 709 // This function can be called more than once. We must make sure that we always 710 // use the latest registered method -> check if a stub already has been generated. 711 // If so, we have to make it not_entrant. 712 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 713 if (nm != NULL) { 714 nm->make_not_entrant(); 715 } 716 } 717 718 719 bool Method::has_native_function() const { 720 if (is_method_handle_intrinsic()) 721 return false; // special-cased in SharedRuntime::generate_native_wrapper 722 address func = native_function(); 723 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 724 } 725 726 727 void Method::clear_native_function() { 728 // Note: is_method_handle_intrinsic() is allowed here. 729 set_native_function( 730 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 731 !native_bind_event_is_interesting); 732 clear_code(); 733 } 734 735 address Method::critical_native_function() { 736 methodHandle mh(this); 737 return NativeLookup::lookup_critical_entry(mh); 738 } 739 740 741 void Method::set_signature_handler(address handler) { 742 address* signature_handler = signature_handler_addr(); 743 *signature_handler = handler; 744 } 745 746 747 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 748 if (PrintCompilation && report) { 749 ttyLocker ttyl; 750 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 751 if (comp_level == CompLevel_all) { 752 tty->print("all levels "); 753 } else { 754 tty->print("levels "); 755 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 756 tty->print("%d ", i); 757 } 758 } 759 this->print_short_name(tty); 760 int size = this->code_size(); 761 if (size > 0) { 762 tty->print(" (%d bytes)", size); 763 } 764 if (reason != NULL) { 765 tty->print(" %s", reason); 766 } 767 tty->cr(); 768 } 769 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 770 ttyLocker ttyl; 771 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 772 os::current_thread_id(), is_osr, comp_level); 773 if (reason != NULL) { 774 xtty->print(" reason=\'%s\'", reason); 775 } 776 xtty->method(this); 777 xtty->stamp(); 778 xtty->end_elem(); 779 } 780 } 781 782 bool Method::is_always_compilable() const { 783 // Generated adapters must be compiled 784 if (is_method_handle_intrinsic() && is_synthetic()) { 785 assert(!is_not_c1_compilable(), "sanity check"); 786 assert(!is_not_c2_compilable(), "sanity check"); 787 return true; 788 } 789 790 return false; 791 } 792 793 bool Method::is_not_compilable(int comp_level) const { 794 if (number_of_breakpoints() > 0) 795 return true; 796 if (is_always_compilable()) 797 return false; 798 if (comp_level == CompLevel_any) 799 return is_not_c1_compilable() || is_not_c2_compilable(); 800 if (is_c1_compile(comp_level)) 801 return is_not_c1_compilable(); 802 if (is_c2_compile(comp_level)) 803 return is_not_c2_compilable(); 804 return false; 805 } 806 807 // call this when compiler finds that this method is not compilable 808 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 809 if (is_always_compilable()) { 810 // Don't mark a method which should be always compilable 811 return; 812 } 813 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 814 if (comp_level == CompLevel_all) { 815 set_not_c1_compilable(); 816 set_not_c2_compilable(); 817 } else { 818 if (is_c1_compile(comp_level)) 819 set_not_c1_compilable(); 820 if (is_c2_compile(comp_level)) 821 set_not_c2_compilable(); 822 } 823 CompilationPolicy::policy()->disable_compilation(this); 824 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 825 } 826 827 bool Method::is_not_osr_compilable(int comp_level) const { 828 if (is_not_compilable(comp_level)) 829 return true; 830 if (comp_level == CompLevel_any) 831 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 832 if (is_c1_compile(comp_level)) 833 return is_not_c1_osr_compilable(); 834 if (is_c2_compile(comp_level)) 835 return is_not_c2_osr_compilable(); 836 return false; 837 } 838 839 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 840 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 841 if (comp_level == CompLevel_all) { 842 set_not_c1_osr_compilable(); 843 set_not_c2_osr_compilable(); 844 } else { 845 if (is_c1_compile(comp_level)) 846 set_not_c1_osr_compilable(); 847 if (is_c2_compile(comp_level)) 848 set_not_c2_osr_compilable(); 849 } 850 CompilationPolicy::policy()->disable_compilation(this); 851 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 852 } 853 854 // Revert to using the interpreter and clear out the nmethod 855 void Method::clear_code() { 856 857 // this may be NULL if c2i adapters have not been made yet 858 // Only should happen at allocate time. 859 if (_adapter == NULL) { 860 _from_compiled_entry = NULL; 861 } else { 862 _from_compiled_entry = _adapter->get_c2i_entry(); 863 } 864 OrderAccess::storestore(); 865 _from_interpreted_entry = _i2i_entry; 866 OrderAccess::storestore(); 867 _code = NULL; 868 } 869 870 // Called by class data sharing to remove any entry points (which are not shared) 871 void Method::unlink_method() { 872 _code = NULL; 873 _i2i_entry = NULL; 874 _from_interpreted_entry = NULL; 875 if (is_native()) { 876 *native_function_addr() = NULL; 877 set_signature_handler(NULL); 878 } 879 NOT_PRODUCT(set_compiled_invocation_count(0);) 880 _adapter = NULL; 881 _from_compiled_entry = NULL; 882 883 // In case of DumpSharedSpaces, _method_data should always be NULL. 884 // 885 // During runtime (!DumpSharedSpaces), when we are cleaning a 886 // shared class that failed to load, this->link_method() may 887 // have already been called (before an exception happened), so 888 // this->_method_data may not be NULL. 889 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?"); 890 891 set_method_data(NULL); 892 clear_method_counters(); 893 } 894 895 // Called when the method_holder is getting linked. Setup entrypoints so the method 896 // is ready to be called from interpreter, compiler, and vtables. 897 void Method::link_method(methodHandle h_method, TRAPS) { 898 // If the code cache is full, we may reenter this function for the 899 // leftover methods that weren't linked. 900 if (_i2i_entry != NULL) return; 901 902 assert(_adapter == NULL, "init'd to NULL" ); 903 assert( _code == NULL, "nothing compiled yet" ); 904 905 // Setup interpreter entrypoint 906 assert(this == h_method(), "wrong h_method()" ); 907 address entry = Interpreter::entry_for_method(h_method); 908 assert(entry != NULL, "interpreter entry must be non-null"); 909 // Sets both _i2i_entry and _from_interpreted_entry 910 set_interpreter_entry(entry); 911 912 // Don't overwrite already registered native entries. 913 if (is_native() && !has_native_function()) { 914 set_native_function( 915 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 916 !native_bind_event_is_interesting); 917 } 918 919 // Setup compiler entrypoint. This is made eagerly, so we do not need 920 // special handling of vtables. An alternative is to make adapters more 921 // lazily by calling make_adapter() from from_compiled_entry() for the 922 // normal calls. For vtable calls life gets more complicated. When a 923 // call-site goes mega-morphic we need adapters in all methods which can be 924 // called from the vtable. We need adapters on such methods that get loaded 925 // later. Ditto for mega-morphic itable calls. If this proves to be a 926 // problem we'll make these lazily later. 927 (void) make_adapters(h_method, CHECK); 928 929 // ONLY USE the h_method now as make_adapter may have blocked 930 931 } 932 933 address Method::make_adapters(methodHandle mh, TRAPS) { 934 // Adapters for compiled code are made eagerly here. They are fairly 935 // small (generally < 100 bytes) and quick to make (and cached and shared) 936 // so making them eagerly shouldn't be too expensive. 937 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 938 if (adapter == NULL ) { 939 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters"); 940 } 941 942 mh->set_adapter_entry(adapter); 943 mh->_from_compiled_entry = adapter->get_c2i_entry(); 944 return adapter->get_c2i_entry(); 945 } 946 947 void Method::restore_unshareable_info(TRAPS) { 948 // Since restore_unshareable_info can be called more than once for a method, don't 949 // redo any work. If this field is restored, there is nothing to do. 950 if (_from_compiled_entry == NULL) { 951 // restore method's vtable by calling a virtual function 952 restore_vtable(); 953 954 methodHandle mh(THREAD, this); 955 link_method(mh, CHECK); 956 } 957 } 958 959 960 // The verified_code_entry() must be called when a invoke is resolved 961 // on this method. 962 963 // It returns the compiled code entry point, after asserting not null. 964 // This function is called after potential safepoints so that nmethod 965 // or adapter that it points to is still live and valid. 966 // This function must not hit a safepoint! 967 address Method::verified_code_entry() { 968 debug_only(No_Safepoint_Verifier nsv;) 969 assert(_from_compiled_entry != NULL, "must be set"); 970 return _from_compiled_entry; 971 } 972 973 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 974 // (could be racing a deopt). 975 // Not inline to avoid circular ref. 976 bool Method::check_code() const { 977 // cached in a register or local. There's a race on the value of the field. 978 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 979 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 980 } 981 982 // Install compiled code. Instantly it can execute. 983 void Method::set_code(methodHandle mh, nmethod *code) { 984 assert( code, "use clear_code to remove code" ); 985 assert( mh->check_code(), "" ); 986 987 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 988 989 // These writes must happen in this order, because the interpreter will 990 // directly jump to from_interpreted_entry which jumps to an i2c adapter 991 // which jumps to _from_compiled_entry. 992 mh->_code = code; // Assign before allowing compiled code to exec 993 994 int comp_level = code->comp_level(); 995 // In theory there could be a race here. In practice it is unlikely 996 // and not worth worrying about. 997 if (comp_level > mh->highest_comp_level()) { 998 mh->set_highest_comp_level(comp_level); 999 } 1000 1001 OrderAccess::storestore(); 1002 #ifdef SHARK 1003 mh->_from_interpreted_entry = code->insts_begin(); 1004 #else //!SHARK 1005 mh->_from_compiled_entry = code->verified_entry_point(); 1006 OrderAccess::storestore(); 1007 // Instantly compiled code can execute. 1008 if (!mh->is_method_handle_intrinsic()) 1009 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1010 #endif //!SHARK 1011 } 1012 1013 1014 bool Method::is_overridden_in(Klass* k) const { 1015 InstanceKlass* ik = InstanceKlass::cast(k); 1016 1017 if (ik->is_interface()) return false; 1018 1019 // If method is an interface, we skip it - except if it 1020 // is a miranda method 1021 if (method_holder()->is_interface()) { 1022 // Check that method is not a miranda method 1023 if (ik->lookup_method(name(), signature()) == NULL) { 1024 // No implementation exist - so miranda method 1025 return false; 1026 } 1027 return true; 1028 } 1029 1030 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1031 assert(ik->vtable() != NULL, "vtable should exist"); 1032 if (!has_vtable_index()) { 1033 return false; 1034 } else { 1035 Method* vt_m = ik->method_at_vtable(vtable_index()); 1036 return vt_m != this; 1037 } 1038 } 1039 1040 1041 // give advice about whether this Method* should be cached or not 1042 bool Method::should_not_be_cached() const { 1043 if (is_old()) { 1044 // This method has been redefined. It is either EMCP or obsolete 1045 // and we don't want to cache it because that would pin the method 1046 // down and prevent it from being collectible if and when it 1047 // finishes executing. 1048 return true; 1049 } 1050 1051 // caching this method should be just fine 1052 return false; 1053 } 1054 1055 1056 /** 1057 * Returns true if this is one of the specially treated methods for 1058 * security related stack walks (like Reflection.getCallerClass). 1059 */ 1060 bool Method::is_ignored_by_security_stack_walk() const { 1061 if (intrinsic_id() == vmIntrinsics::_invoke) { 1062 // This is Method.invoke() -- ignore it 1063 return true; 1064 } 1065 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1066 // This is an auxilary frame -- ignore it 1067 return true; 1068 } 1069 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1070 // This is an internal adapter frame for method handles -- ignore it 1071 return true; 1072 } 1073 return false; 1074 } 1075 1076 1077 // Constant pool structure for invoke methods: 1078 enum { 1079 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1080 _imcp_invoke_signature, // utf8: (variable Symbol*) 1081 _imcp_limit 1082 }; 1083 1084 // Test if this method is an MH adapter frame generated by Java code. 1085 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1086 bool Method::is_compiled_lambda_form() const { 1087 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1088 } 1089 1090 // Test if this method is an internal MH primitive method. 1091 bool Method::is_method_handle_intrinsic() const { 1092 vmIntrinsics::ID iid = intrinsic_id(); 1093 return (MethodHandles::is_signature_polymorphic(iid) && 1094 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1095 } 1096 1097 bool Method::has_member_arg() const { 1098 vmIntrinsics::ID iid = intrinsic_id(); 1099 return (MethodHandles::is_signature_polymorphic(iid) && 1100 MethodHandles::has_member_arg(iid)); 1101 } 1102 1103 // Make an instance of a signature-polymorphic internal MH primitive. 1104 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1105 Symbol* signature, 1106 TRAPS) { 1107 ResourceMark rm; 1108 methodHandle empty; 1109 1110 KlassHandle holder = SystemDictionary::MethodHandle_klass(); 1111 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1112 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1113 if (TraceMethodHandles) { 1114 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1115 } 1116 1117 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1118 name->increment_refcount(); 1119 signature->increment_refcount(); 1120 1121 int cp_length = _imcp_limit; 1122 ClassLoaderData* loader_data = holder->class_loader_data(); 1123 constantPoolHandle cp; 1124 { 1125 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1126 cp = constantPoolHandle(THREAD, cp_oop); 1127 } 1128 cp->set_pool_holder(InstanceKlass::cast(holder())); 1129 cp->symbol_at_put(_imcp_invoke_name, name); 1130 cp->symbol_at_put(_imcp_invoke_signature, signature); 1131 cp->set_has_preresolution(); 1132 1133 // decide on access bits: public or not? 1134 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1135 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1136 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1137 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1138 1139 methodHandle m; 1140 { 1141 InlineTableSizes sizes; 1142 Method* m_oop = Method::allocate(loader_data, 0, 1143 accessFlags_from(flags_bits), &sizes, 1144 ConstMethod::NORMAL, CHECK_(empty)); 1145 m = methodHandle(THREAD, m_oop); 1146 } 1147 m->set_constants(cp()); 1148 m->set_name_index(_imcp_invoke_name); 1149 m->set_signature_index(_imcp_invoke_signature); 1150 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1151 assert(m->signature() == signature, ""); 1152 #ifdef CC_INTERP 1153 ResultTypeFinder rtf(signature); 1154 m->set_result_index(rtf.type()); 1155 #endif 1156 m->compute_size_of_parameters(THREAD); 1157 m->init_intrinsic_id(); 1158 assert(m->is_method_handle_intrinsic(), ""); 1159 #ifdef ASSERT 1160 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1161 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1162 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1163 #endif //ASSERT 1164 1165 // Finally, set up its entry points. 1166 assert(m->can_be_statically_bound(), ""); 1167 m->set_vtable_index(Method::nonvirtual_vtable_index); 1168 m->link_method(m, CHECK_(empty)); 1169 1170 if (TraceMethodHandles && (Verbose || WizardMode)) 1171 m->print_on(tty); 1172 1173 return m; 1174 } 1175 1176 Klass* Method::check_non_bcp_klass(Klass* klass) { 1177 if (klass != NULL && klass->class_loader() != NULL) { 1178 if (klass->oop_is_objArray()) 1179 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1180 return klass; 1181 } 1182 return NULL; 1183 } 1184 1185 1186 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1187 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1188 // Code below does not work for native methods - they should never get rewritten anyway 1189 assert(!m->is_native(), "cannot rewrite native methods"); 1190 // Allocate new Method* 1191 AccessFlags flags = m->access_flags(); 1192 1193 ConstMethod* cm = m->constMethod(); 1194 int checked_exceptions_len = cm->checked_exceptions_length(); 1195 int localvariable_len = cm->localvariable_table_length(); 1196 int exception_table_len = cm->exception_table_length(); 1197 int method_parameters_len = cm->method_parameters_length(); 1198 int method_annotations_len = cm->method_annotations_length(); 1199 int parameter_annotations_len = cm->parameter_annotations_length(); 1200 int type_annotations_len = cm->type_annotations_length(); 1201 int default_annotations_len = cm->default_annotations_length(); 1202 1203 InlineTableSizes sizes( 1204 localvariable_len, 1205 new_compressed_linenumber_size, 1206 exception_table_len, 1207 checked_exceptions_len, 1208 method_parameters_len, 1209 cm->generic_signature_index(), 1210 method_annotations_len, 1211 parameter_annotations_len, 1212 type_annotations_len, 1213 default_annotations_len, 1214 0); 1215 1216 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1217 Method* newm_oop = Method::allocate(loader_data, 1218 new_code_length, 1219 flags, 1220 &sizes, 1221 m->method_type(), 1222 CHECK_(methodHandle())); 1223 methodHandle newm (THREAD, newm_oop); 1224 int new_method_size = newm->method_size(); 1225 1226 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1227 ConstMethod* newcm = newm->constMethod(); 1228 int new_const_method_size = newm->constMethod()->size(); 1229 1230 memcpy(newm(), m(), sizeof(Method)); 1231 1232 // Create shallow copy of ConstMethod. 1233 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1234 1235 // Reset correct method/const method, method size, and parameter info 1236 newm->set_constMethod(newcm); 1237 newm->constMethod()->set_code_size(new_code_length); 1238 newm->constMethod()->set_constMethod_size(new_const_method_size); 1239 newm->set_method_size(new_method_size); 1240 assert(newm->code_size() == new_code_length, "check"); 1241 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1242 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1243 assert(newm->exception_table_length() == exception_table_len, "check"); 1244 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1245 // Copy new byte codes 1246 memcpy(newm->code_base(), new_code, new_code_length); 1247 // Copy line number table 1248 if (new_compressed_linenumber_size > 0) { 1249 memcpy(newm->compressed_linenumber_table(), 1250 new_compressed_linenumber_table, 1251 new_compressed_linenumber_size); 1252 } 1253 // Copy method_parameters 1254 if (method_parameters_len > 0) { 1255 memcpy(newm->method_parameters_start(), 1256 m->method_parameters_start(), 1257 method_parameters_len * sizeof(MethodParametersElement)); 1258 } 1259 // Copy checked_exceptions 1260 if (checked_exceptions_len > 0) { 1261 memcpy(newm->checked_exceptions_start(), 1262 m->checked_exceptions_start(), 1263 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1264 } 1265 // Copy exception table 1266 if (exception_table_len > 0) { 1267 memcpy(newm->exception_table_start(), 1268 m->exception_table_start(), 1269 exception_table_len * sizeof(ExceptionTableElement)); 1270 } 1271 // Copy local variable number table 1272 if (localvariable_len > 0) { 1273 memcpy(newm->localvariable_table_start(), 1274 m->localvariable_table_start(), 1275 localvariable_len * sizeof(LocalVariableTableElement)); 1276 } 1277 // Copy stackmap table 1278 if (m->has_stackmap_table()) { 1279 int code_attribute_length = m->stackmap_data()->length(); 1280 Array<u1>* stackmap_data = 1281 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1282 memcpy((void*)stackmap_data->adr_at(0), 1283 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1284 newm->set_stackmap_data(stackmap_data); 1285 } 1286 1287 // copy annotations over to new method 1288 newcm->copy_annotations_from(cm); 1289 return newm; 1290 } 1291 1292 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) { 1293 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1294 // because we are not loading from core libraries 1295 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1296 // which does not use the class default class loader so we check for its loader here 1297 InstanceKlass* ik = InstanceKlass::cast(holder); 1298 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) { 1299 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1300 } 1301 1302 // see if the klass name is well-known: 1303 Symbol* klass_name = ik->name(); 1304 return vmSymbols::find_sid(klass_name); 1305 } 1306 1307 void Method::init_intrinsic_id() { 1308 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1309 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1310 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1311 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1312 1313 // the klass name is well-known: 1314 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1315 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1316 1317 // ditto for method and signature: 1318 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1319 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1320 && name_id == vmSymbols::NO_SID) 1321 return; 1322 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1323 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1324 && sig_id == vmSymbols::NO_SID) return; 1325 jshort flags = access_flags().as_short(); 1326 1327 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1328 if (id != vmIntrinsics::_none) { 1329 set_intrinsic_id(id); 1330 if (id == vmIntrinsics::_Class_cast) { 1331 // Even if the intrinsic is rejected, we want to inline this simple method. 1332 set_force_inline(true); 1333 } 1334 return; 1335 } 1336 1337 // A few slightly irregular cases: 1338 switch (klass_id) { 1339 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1340 // Second chance: check in regular Math. 1341 switch (name_id) { 1342 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1343 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1344 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1345 // pretend it is the corresponding method in the non-strict class: 1346 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1347 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1348 break; 1349 } 1350 break; 1351 1352 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. 1353 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1354 if (!is_native()) break; 1355 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1356 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1357 id = vmIntrinsics::_none; 1358 break; 1359 } 1360 1361 if (id != vmIntrinsics::_none) { 1362 // Set up its iid. It is an alias method. 1363 set_intrinsic_id(id); 1364 return; 1365 } 1366 } 1367 1368 // These two methods are static since a GC may move the Method 1369 bool Method::load_signature_classes(methodHandle m, TRAPS) { 1370 if (THREAD->is_Compiler_thread()) { 1371 // There is nothing useful this routine can do from within the Compile thread. 1372 // Hopefully, the signature contains only well-known classes. 1373 // We could scan for this and return true/false, but the caller won't care. 1374 return false; 1375 } 1376 bool sig_is_loaded = true; 1377 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1378 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1379 ResourceMark rm(THREAD); 1380 Symbol* signature = m->signature(); 1381 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1382 if (ss.is_object()) { 1383 Symbol* sym = ss.as_symbol(CHECK_(false)); 1384 Symbol* name = sym; 1385 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1386 protection_domain, THREAD); 1387 // We are loading classes eagerly. If a ClassNotFoundException or 1388 // a LinkageError was generated, be sure to ignore it. 1389 if (HAS_PENDING_EXCEPTION) { 1390 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1391 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1392 CLEAR_PENDING_EXCEPTION; 1393 } else { 1394 return false; 1395 } 1396 } 1397 if( klass == NULL) { sig_is_loaded = false; } 1398 } 1399 } 1400 return sig_is_loaded; 1401 } 1402 1403 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1404 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1405 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1406 ResourceMark rm(THREAD); 1407 Symbol* signature = m->signature(); 1408 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1409 if (ss.type() == T_OBJECT) { 1410 Symbol* name = ss.as_symbol_or_null(); 1411 if (name == NULL) return true; 1412 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1413 if (klass == NULL) return true; 1414 } 1415 } 1416 return false; 1417 } 1418 1419 // Exposed so field engineers can debug VM 1420 void Method::print_short_name(outputStream* st) { 1421 ResourceMark rm; 1422 #ifdef PRODUCT 1423 st->print(" %s::", method_holder()->external_name()); 1424 #else 1425 st->print(" %s::", method_holder()->internal_name()); 1426 #endif 1427 name()->print_symbol_on(st); 1428 if (WizardMode) signature()->print_symbol_on(st); 1429 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1430 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1431 } 1432 1433 // Comparer for sorting an object array containing 1434 // Method*s. 1435 static int method_comparator(Method* a, Method* b) { 1436 return a->name()->fast_compare(b->name()); 1437 } 1438 1439 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1440 // default_methods also uses this without the ordering for fast find_method 1441 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) { 1442 int length = methods->length(); 1443 if (length > 1) { 1444 { 1445 No_Safepoint_Verifier nsv; 1446 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); 1447 } 1448 // Reset method ordering 1449 if (set_idnums) { 1450 for (int i = 0; i < length; i++) { 1451 Method* m = methods->at(i); 1452 m->set_method_idnum(i); 1453 m->set_orig_method_idnum(i); 1454 } 1455 } 1456 } 1457 } 1458 1459 //----------------------------------------------------------------------------------- 1460 // Non-product code unless JVM/TI needs it 1461 1462 #if !defined(PRODUCT) || INCLUDE_JVMTI 1463 class SignatureTypePrinter : public SignatureTypeNames { 1464 private: 1465 outputStream* _st; 1466 bool _use_separator; 1467 1468 void type_name(const char* name) { 1469 if (_use_separator) _st->print(", "); 1470 _st->print("%s", name); 1471 _use_separator = true; 1472 } 1473 1474 public: 1475 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1476 _st = st; 1477 _use_separator = false; 1478 } 1479 1480 void print_parameters() { _use_separator = false; iterate_parameters(); } 1481 void print_returntype() { _use_separator = false; iterate_returntype(); } 1482 }; 1483 1484 1485 void Method::print_name(outputStream* st) { 1486 Thread *thread = Thread::current(); 1487 ResourceMark rm(thread); 1488 SignatureTypePrinter sig(signature(), st); 1489 st->print("%s ", is_static() ? "static" : "virtual"); 1490 sig.print_returntype(); 1491 st->print(" %s.", method_holder()->internal_name()); 1492 name()->print_symbol_on(st); 1493 st->print("("); 1494 sig.print_parameters(); 1495 st->print(")"); 1496 } 1497 #endif // !PRODUCT || INCLUDE_JVMTI 1498 1499 1500 void Method::print_codes_on(outputStream* st) const { 1501 print_codes_on(0, code_size(), st); 1502 } 1503 1504 void Method::print_codes_on(int from, int to, outputStream* st) const { 1505 Thread *thread = Thread::current(); 1506 ResourceMark rm(thread); 1507 methodHandle mh (thread, (Method*)this); 1508 BytecodeStream s(mh); 1509 s.set_interval(from, to); 1510 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1511 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1512 } 1513 1514 1515 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1516 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1517 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1518 // as end-of-stream terminator. 1519 1520 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1521 // bci and line number does not compress into single byte. 1522 // Write out escape character and use regular compression for bci and line number. 1523 write_byte((jubyte)0xFF); 1524 write_signed_int(bci_delta); 1525 write_signed_int(line_delta); 1526 } 1527 1528 // See comment in method.hpp which explains why this exists. 1529 #if defined(_M_AMD64) && _MSC_VER >= 1400 1530 #pragma optimize("", off) 1531 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1532 write_pair_inline(bci, line); 1533 } 1534 #pragma optimize("", on) 1535 #endif 1536 1537 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1538 _bci = 0; 1539 _line = 0; 1540 }; 1541 1542 1543 bool CompressedLineNumberReadStream::read_pair() { 1544 jubyte next = read_byte(); 1545 // Check for terminator 1546 if (next == 0) return false; 1547 if (next == 0xFF) { 1548 // Escape character, regular compression used 1549 _bci += read_signed_int(); 1550 _line += read_signed_int(); 1551 } else { 1552 // Single byte compression used 1553 _bci += next >> 3; 1554 _line += next & 0x7; 1555 } 1556 return true; 1557 } 1558 1559 1560 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1561 BreakpointInfo* bp = method_holder()->breakpoints(); 1562 for (; bp != NULL; bp = bp->next()) { 1563 if (bp->match(this, bci)) { 1564 return bp->orig_bytecode(); 1565 } 1566 } 1567 { 1568 ResourceMark rm; 1569 fatal(err_msg("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci)); 1570 } 1571 return Bytecodes::_shouldnotreachhere; 1572 } 1573 1574 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1575 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1576 BreakpointInfo* bp = method_holder()->breakpoints(); 1577 for (; bp != NULL; bp = bp->next()) { 1578 if (bp->match(this, bci)) { 1579 bp->set_orig_bytecode(code); 1580 // and continue, in case there is more than one 1581 } 1582 } 1583 } 1584 1585 void Method::set_breakpoint(int bci) { 1586 InstanceKlass* ik = method_holder(); 1587 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1588 bp->set_next(ik->breakpoints()); 1589 ik->set_breakpoints(bp); 1590 // do this last: 1591 bp->set(this); 1592 } 1593 1594 static void clear_matches(Method* m, int bci) { 1595 InstanceKlass* ik = m->method_holder(); 1596 BreakpointInfo* prev_bp = NULL; 1597 BreakpointInfo* next_bp; 1598 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1599 next_bp = bp->next(); 1600 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1601 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1602 // do this first: 1603 bp->clear(m); 1604 // unhook it 1605 if (prev_bp != NULL) 1606 prev_bp->set_next(next_bp); 1607 else 1608 ik->set_breakpoints(next_bp); 1609 delete bp; 1610 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1611 // at same location. So we have multiple matching (method_index and bci) 1612 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1613 // breakpoint for clear_breakpoint request and keep all other method versions 1614 // BreakpointInfo for future clear_breakpoint request. 1615 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1616 // which is being called when class is unloaded. We delete all the Breakpoint 1617 // information for all versions of method. We may not correctly restore the original 1618 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1619 // so these methods won't be used anymore. 1620 if (bci >= 0) { 1621 break; 1622 } 1623 } else { 1624 // This one is a keeper. 1625 prev_bp = bp; 1626 } 1627 } 1628 } 1629 1630 void Method::clear_breakpoint(int bci) { 1631 assert(bci >= 0, ""); 1632 clear_matches(this, bci); 1633 } 1634 1635 void Method::clear_all_breakpoints() { 1636 clear_matches(this, -1); 1637 } 1638 1639 1640 int Method::invocation_count() { 1641 MethodCounters *mcs = method_counters(); 1642 if (TieredCompilation) { 1643 MethodData* const mdo = method_data(); 1644 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1645 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1646 return InvocationCounter::count_limit; 1647 } else { 1648 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1649 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1650 } 1651 } else { 1652 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1653 } 1654 } 1655 1656 int Method::backedge_count() { 1657 MethodCounters *mcs = method_counters(); 1658 if (TieredCompilation) { 1659 MethodData* const mdo = method_data(); 1660 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1661 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1662 return InvocationCounter::count_limit; 1663 } else { 1664 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1665 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1666 } 1667 } else { 1668 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1669 } 1670 } 1671 1672 int Method::highest_comp_level() const { 1673 const MethodCounters* mcs = method_counters(); 1674 if (mcs != NULL) { 1675 return mcs->highest_comp_level(); 1676 } else { 1677 return CompLevel_none; 1678 } 1679 } 1680 1681 int Method::highest_osr_comp_level() const { 1682 const MethodCounters* mcs = method_counters(); 1683 if (mcs != NULL) { 1684 return mcs->highest_osr_comp_level(); 1685 } else { 1686 return CompLevel_none; 1687 } 1688 } 1689 1690 void Method::set_highest_comp_level(int level) { 1691 MethodCounters* mcs = method_counters(); 1692 if (mcs != NULL) { 1693 mcs->set_highest_comp_level(level); 1694 } 1695 } 1696 1697 void Method::set_highest_osr_comp_level(int level) { 1698 MethodCounters* mcs = method_counters(); 1699 if (mcs != NULL) { 1700 mcs->set_highest_osr_comp_level(level); 1701 } 1702 } 1703 1704 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1705 _bci = bci; 1706 _name_index = m->name_index(); 1707 _signature_index = m->signature_index(); 1708 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1709 if (_orig_bytecode == Bytecodes::_breakpoint) 1710 _orig_bytecode = m->orig_bytecode_at(_bci); 1711 _next = NULL; 1712 } 1713 1714 void BreakpointInfo::set(Method* method) { 1715 #ifdef ASSERT 1716 { 1717 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1718 if (code == Bytecodes::_breakpoint) 1719 code = method->orig_bytecode_at(_bci); 1720 assert(orig_bytecode() == code, "original bytecode must be the same"); 1721 } 1722 #endif 1723 Thread *thread = Thread::current(); 1724 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1725 method->incr_number_of_breakpoints(thread); 1726 SystemDictionary::notice_modification(); 1727 { 1728 // Deoptimize all dependents on this method 1729 HandleMark hm(thread); 1730 methodHandle mh(thread, method); 1731 CodeCache::flush_dependents_on_method(mh); 1732 } 1733 } 1734 1735 void BreakpointInfo::clear(Method* method) { 1736 *method->bcp_from(_bci) = orig_bytecode(); 1737 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1738 method->decr_number_of_breakpoints(Thread::current()); 1739 } 1740 1741 // jmethodID handling 1742 1743 // This is a block allocating object, sort of like JNIHandleBlock, only a 1744 // lot simpler. 1745 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1746 // never get rid of it. 1747 1748 static const int min_block_size = 8; 1749 1750 class JNIMethodBlockNode : public CHeapObj<mtClass> { 1751 friend class JNIMethodBlock; 1752 Method** _methods; 1753 int _number_of_methods; 1754 int _top; 1755 JNIMethodBlockNode* _next; 1756 1757 public: 1758 1759 JNIMethodBlockNode(int num_methods = min_block_size); 1760 1761 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 1762 1763 void ensure_methods(int num_addl_methods) { 1764 if (_top < _number_of_methods) { 1765 num_addl_methods -= _number_of_methods - _top; 1766 if (num_addl_methods <= 0) { 1767 return; 1768 } 1769 } 1770 if (_next == NULL) { 1771 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 1772 } else { 1773 _next->ensure_methods(num_addl_methods); 1774 } 1775 } 1776 }; 1777 1778 class JNIMethodBlock : public CHeapObj<mtClass> { 1779 JNIMethodBlockNode _head; 1780 JNIMethodBlockNode *_last_free; 1781 public: 1782 static Method* const _free_method; 1783 1784 JNIMethodBlock(int initial_capacity = min_block_size) 1785 : _head(initial_capacity), _last_free(&_head) {} 1786 1787 void ensure_methods(int num_addl_methods) { 1788 _last_free->ensure_methods(num_addl_methods); 1789 } 1790 1791 Method** add_method(Method* m) { 1792 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) { 1793 if (b->_top < b->_number_of_methods) { 1794 // top points to the next free entry. 1795 int i = b->_top; 1796 b->_methods[i] = m; 1797 b->_top++; 1798 _last_free = b; 1799 return &(b->_methods[i]); 1800 } else if (b->_top == b->_number_of_methods) { 1801 // if the next free entry ran off the block see if there's a free entry 1802 for (int i = 0; i < b->_number_of_methods; i++) { 1803 if (b->_methods[i] == _free_method) { 1804 b->_methods[i] = m; 1805 _last_free = b; 1806 return &(b->_methods[i]); 1807 } 1808 } 1809 // Only check each block once for frees. They're very unlikely. 1810 // Increment top past the end of the block. 1811 b->_top++; 1812 } 1813 // need to allocate a next block. 1814 if (b->_next == NULL) { 1815 b->_next = _last_free = new JNIMethodBlockNode(); 1816 } 1817 } 1818 guarantee(false, "Should always allocate a free block"); 1819 return NULL; 1820 } 1821 1822 bool contains(Method** m) { 1823 if (m == NULL) return false; 1824 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 1825 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 1826 // This is a bit of extra checking, for two reasons. One is 1827 // that contains() deals with pointers that are passed in by 1828 // JNI code, so making sure that the pointer is aligned 1829 // correctly is valuable. The other is that <= and > are 1830 // technically not defined on pointers, so the if guard can 1831 // pass spuriously; no modern compiler is likely to make that 1832 // a problem, though (and if one did, the guard could also 1833 // fail spuriously, which would be bad). 1834 ptrdiff_t idx = m - b->_methods; 1835 if (b->_methods + idx == m) { 1836 return true; 1837 } 1838 } 1839 } 1840 return false; // not found 1841 } 1842 1843 // Doesn't really destroy it, just marks it as free so it can be reused. 1844 void destroy_method(Method** m) { 1845 #ifdef ASSERT 1846 assert(contains(m), "should be a methodID"); 1847 #endif // ASSERT 1848 *m = _free_method; 1849 } 1850 1851 // During class unloading the methods are cleared, which is different 1852 // than freed. 1853 void clear_all_methods() { 1854 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 1855 for (int i = 0; i< b->_number_of_methods; i++) { 1856 b->_methods[i] = NULL; 1857 } 1858 } 1859 } 1860 #ifndef PRODUCT 1861 int count_methods() { 1862 // count all allocated methods 1863 int count = 0; 1864 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 1865 for (int i = 0; i< b->_number_of_methods; i++) { 1866 if (b->_methods[i] != _free_method) count++; 1867 } 1868 } 1869 return count; 1870 } 1871 #endif // PRODUCT 1872 }; 1873 1874 // Something that can't be mistaken for an address or a markOop 1875 Method* const JNIMethodBlock::_free_method = (Method*)55; 1876 1877 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) { 1878 _number_of_methods = MAX2(num_methods, min_block_size); 1879 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 1880 for (int i = 0; i < _number_of_methods; i++) { 1881 _methods[i] = JNIMethodBlock::_free_method; 1882 } 1883 } 1884 1885 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) { 1886 ClassLoaderData* cld = loader_data; 1887 if (!SafepointSynchronize::is_at_safepoint()) { 1888 // Have to add jmethod_ids() to class loader data thread-safely. 1889 // Also have to add the method to the list safely, which the cld lock 1890 // protects as well. 1891 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 1892 if (cld->jmethod_ids() == NULL) { 1893 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 1894 } else { 1895 cld->jmethod_ids()->ensure_methods(capacity); 1896 } 1897 } else { 1898 // At safepoint, we are single threaded and can set this. 1899 if (cld->jmethod_ids() == NULL) { 1900 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 1901 } else { 1902 cld->jmethod_ids()->ensure_methods(capacity); 1903 } 1904 } 1905 } 1906 1907 // Add a method id to the jmethod_ids 1908 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 1909 ClassLoaderData* cld = loader_data; 1910 1911 if (!SafepointSynchronize::is_at_safepoint()) { 1912 // Have to add jmethod_ids() to class loader data thread-safely. 1913 // Also have to add the method to the list safely, which the cld lock 1914 // protects as well. 1915 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 1916 if (cld->jmethod_ids() == NULL) { 1917 cld->set_jmethod_ids(new JNIMethodBlock()); 1918 } 1919 // jmethodID is a pointer to Method* 1920 return (jmethodID)cld->jmethod_ids()->add_method(m); 1921 } else { 1922 // At safepoint, we are single threaded and can set this. 1923 if (cld->jmethod_ids() == NULL) { 1924 cld->set_jmethod_ids(new JNIMethodBlock()); 1925 } 1926 // jmethodID is a pointer to Method* 1927 return (jmethodID)cld->jmethod_ids()->add_method(m); 1928 } 1929 } 1930 1931 // Mark a jmethodID as free. This is called when there is a data race in 1932 // InstanceKlass while creating the jmethodID cache. 1933 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 1934 ClassLoaderData* cld = loader_data; 1935 Method** ptr = (Method**)m; 1936 assert(cld->jmethod_ids() != NULL, "should have method handles"); 1937 cld->jmethod_ids()->destroy_method(ptr); 1938 } 1939 1940 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 1941 // Can't assert the method_holder is the same because the new method has the 1942 // scratch method holder. 1943 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 1944 == new_method->method_holder()->class_loader(), 1945 "changing to a different class loader"); 1946 // Just change the method in place, jmethodID pointer doesn't change. 1947 *((Method**)jmid) = new_method; 1948 } 1949 1950 bool Method::is_method_id(jmethodID mid) { 1951 Method* m = resolve_jmethod_id(mid); 1952 assert(m != NULL, "should be called with non-null method"); 1953 InstanceKlass* ik = m->method_holder(); 1954 ClassLoaderData* cld = ik->class_loader_data(); 1955 if (cld->jmethod_ids() == NULL) return false; 1956 return (cld->jmethod_ids()->contains((Method**)mid)); 1957 } 1958 1959 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 1960 if (mid == NULL) return NULL; 1961 Method* o = resolve_jmethod_id(mid); 1962 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 1963 return NULL; 1964 } 1965 return o; 1966 }; 1967 1968 void Method::set_on_stack(const bool value) { 1969 // Set both the method itself and its constant pool. The constant pool 1970 // on stack means some method referring to it is also on the stack. 1971 constants()->set_on_stack(value); 1972 1973 bool already_set = on_stack(); 1974 _access_flags.set_on_stack(value); 1975 if (value && !already_set) { 1976 MetadataOnStackMark::record(this); 1977 } 1978 } 1979 1980 // Called when the class loader is unloaded to make all methods weak. 1981 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 1982 loader_data->jmethod_ids()->clear_all_methods(); 1983 } 1984 1985 bool Method::has_method_vptr(const void* ptr) { 1986 Method m; 1987 // This assumes that the vtbl pointer is the first word of a C++ object. 1988 // This assumption is also in universe.cpp patch_klass_vtble 1989 void* vtbl2 = dereference_vptr((const void*)&m); 1990 void* this_vtbl = dereference_vptr(ptr); 1991 return vtbl2 == this_vtbl; 1992 } 1993 1994 // Check that this pointer is valid by checking that the vtbl pointer matches 1995 bool Method::is_valid_method() const { 1996 if (this == NULL) { 1997 return false; 1998 } else if (!is_metaspace_object()) { 1999 return false; 2000 } else { 2001 return has_method_vptr((const void*)this); 2002 } 2003 } 2004 2005 #ifndef PRODUCT 2006 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 2007 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 2008 } 2009 #endif // PRODUCT 2010 2011 2012 // Printing 2013 2014 #ifndef PRODUCT 2015 2016 void Method::print_on(outputStream* st) const { 2017 ResourceMark rm; 2018 assert(is_method(), "must be method"); 2019 st->print_cr("%s", internal_name()); 2020 // get the effect of PrintOopAddress, always, for methods: 2021 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this); 2022 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2023 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants()); 2024 constants()->print_value_on(st); st->cr(); 2025 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2026 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2027 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2028 st->print_cr(" - max stack: %d", max_stack()); 2029 st->print_cr(" - max locals: %d", max_locals()); 2030 st->print_cr(" - size of params: %d", size_of_parameters()); 2031 st->print_cr(" - method size: %d", method_size()); 2032 if (intrinsic_id() != vmIntrinsics::_none) 2033 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 2034 if (highest_comp_level() != CompLevel_none) 2035 st->print_cr(" - highest level: %d", highest_comp_level()); 2036 st->print_cr(" - vtable index: %d", _vtable_index); 2037 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry()); 2038 st->print( " - adapters: "); 2039 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2040 if (a == NULL) 2041 st->print_cr(INTPTR_FORMAT, a); 2042 else 2043 a->print_adapter_on(st); 2044 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry()); 2045 st->print_cr(" - code size: %d", code_size()); 2046 if (code_size() != 0) { 2047 st->print_cr(" - code start: " INTPTR_FORMAT, code_base()); 2048 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size()); 2049 } 2050 if (method_data() != NULL) { 2051 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data()); 2052 } 2053 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2054 if (checked_exceptions_length() > 0) { 2055 CheckedExceptionElement* table = checked_exceptions_start(); 2056 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table); 2057 if (Verbose) { 2058 for (int i = 0; i < checked_exceptions_length(); i++) { 2059 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2060 } 2061 } 2062 } 2063 if (has_linenumber_table()) { 2064 u_char* table = compressed_linenumber_table(); 2065 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table); 2066 if (Verbose) { 2067 CompressedLineNumberReadStream stream(table); 2068 while (stream.read_pair()) { 2069 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2070 } 2071 } 2072 } 2073 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2074 if (localvariable_table_length() > 0) { 2075 LocalVariableTableElement* table = localvariable_table_start(); 2076 st->print_cr(" - localvar start: " INTPTR_FORMAT, table); 2077 if (Verbose) { 2078 for (int i = 0; i < localvariable_table_length(); i++) { 2079 int bci = table[i].start_bci; 2080 int len = table[i].length; 2081 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2082 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2083 int slot = table[i].slot; 2084 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2085 } 2086 } 2087 } 2088 if (code() != NULL) { 2089 st->print (" - compiled code: "); 2090 code()->print_value_on(st); 2091 } 2092 if (is_native()) { 2093 st->print_cr(" - native function: " INTPTR_FORMAT, native_function()); 2094 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler()); 2095 } 2096 } 2097 2098 #endif //PRODUCT 2099 2100 void Method::print_value_on(outputStream* st) const { 2101 assert(is_method(), "must be method"); 2102 st->print("%s", internal_name()); 2103 print_address_on(st); 2104 st->print(" "); 2105 name()->print_value_on(st); 2106 st->print(" "); 2107 signature()->print_value_on(st); 2108 st->print(" in "); 2109 method_holder()->print_value_on(st); 2110 if (WizardMode) st->print("#%d", _vtable_index); 2111 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2112 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2113 } 2114 2115 #if INCLUDE_SERVICES 2116 // Size Statistics 2117 void Method::collect_statistics(KlassSizeStats *sz) const { 2118 int mysize = sz->count(this); 2119 sz->_method_bytes += mysize; 2120 sz->_method_all_bytes += mysize; 2121 sz->_rw_bytes += mysize; 2122 2123 if (constMethod()) { 2124 constMethod()->collect_statistics(sz); 2125 } 2126 if (method_data()) { 2127 method_data()->collect_statistics(sz); 2128 } 2129 } 2130 #endif // INCLUDE_SERVICES 2131 2132 // Verification 2133 2134 void Method::verify_on(outputStream* st) { 2135 guarantee(is_method(), "object must be method"); 2136 guarantee(constants()->is_constantPool(), "should be constant pool"); 2137 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 2138 MethodData* md = method_data(); 2139 guarantee(md == NULL || 2140 md->is_methodData(), "should be method data"); 2141 }