1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/metadataOnStackMark.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "code/codeCache.hpp" 29 #include "code/debugInfoRec.hpp" 30 #include "gc/shared/collectedHeap.inline.hpp" 31 #include "gc/shared/gcLocker.hpp" 32 #include "gc/shared/generation.hpp" 33 #include "interpreter/bytecodeStream.hpp" 34 #include "interpreter/bytecodeTracer.hpp" 35 #include "interpreter/bytecodes.hpp" 36 #include "interpreter/interpreter.hpp" 37 #include "interpreter/oopMapCache.hpp" 38 #include "memory/heapInspection.hpp" 39 #include "memory/metadataFactory.hpp" 40 #include "memory/metaspaceShared.hpp" 41 #include "memory/oopFactory.hpp" 42 #include "memory/resourceArea.hpp" 43 #include "oops/constMethod.hpp" 44 #include "oops/method.hpp" 45 #include "oops/methodData.hpp" 46 #include "oops/objArrayOop.inline.hpp" 47 #include "oops/oop.inline.hpp" 48 #include "oops/symbol.hpp" 49 #include "prims/jvmtiExport.hpp" 50 #include "prims/methodHandles.hpp" 51 #include "prims/nativeLookup.hpp" 52 #include "runtime/arguments.hpp" 53 #include "runtime/compilationPolicy.hpp" 54 #include "runtime/frame.inline.hpp" 55 #include "runtime/handles.inline.hpp" 56 #include "runtime/orderAccess.inline.hpp" 57 #include "runtime/relocator.hpp" 58 #include "runtime/sharedRuntime.hpp" 59 #include "runtime/signature.hpp" 60 #include "utilities/quickSort.hpp" 61 #include "utilities/xmlstream.hpp" 62 63 // Implementation of Method 64 65 Method* Method::allocate(ClassLoaderData* loader_data, 66 int byte_code_size, 67 AccessFlags access_flags, 68 InlineTableSizes* sizes, 69 ConstMethod::MethodType method_type, 70 TRAPS) { 71 assert(!access_flags.is_native() || byte_code_size == 0, 72 "native methods should not contain byte codes"); 73 ConstMethod* cm = ConstMethod::allocate(loader_data, 74 byte_code_size, 75 sizes, 76 method_type, 77 CHECK_NULL); 78 int size = Method::size(access_flags.is_native()); 79 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags); 80 } 81 82 Method::Method(ConstMethod* xconst, AccessFlags access_flags) { 83 NoSafepointVerifier no_safepoint; 84 set_constMethod(xconst); 85 set_access_flags(access_flags); 86 set_intrinsic_id(vmIntrinsics::_none); 87 set_jfr_towrite(false); 88 set_force_inline(false); 89 set_hidden(false); 90 set_dont_inline(false); 91 set_has_injected_profile(false); 92 set_method_data(NULL); 93 clear_method_counters(); 94 set_vtable_index(Method::garbage_vtable_index); 95 96 // Fix and bury in Method* 97 set_interpreter_entry(NULL); // sets i2i entry and from_int 98 set_adapter_entry(NULL); 99 clear_code(); // from_c/from_i get set to c2i/i2i 100 101 if (access_flags.is_native()) { 102 clear_native_function(); 103 set_signature_handler(NULL); 104 } 105 106 NOT_PRODUCT(set_compiled_invocation_count(0);) 107 } 108 109 // Release Method*. The nmethod will be gone when we get here because 110 // we've walked the code cache. 111 void Method::deallocate_contents(ClassLoaderData* loader_data) { 112 MetadataFactory::free_metadata(loader_data, constMethod()); 113 set_constMethod(NULL); 114 MetadataFactory::free_metadata(loader_data, method_data()); 115 set_method_data(NULL); 116 MetadataFactory::free_metadata(loader_data, method_counters()); 117 clear_method_counters(); 118 // The nmethod will be gone when we get here. 119 if (code() != NULL) _code = NULL; 120 } 121 122 address Method::get_i2c_entry() { 123 assert(adapter() != NULL, "must have"); 124 return adapter()->get_i2c_entry(); 125 } 126 127 address Method::get_c2i_entry() { 128 assert(adapter() != NULL, "must have"); 129 return adapter()->get_c2i_entry(); 130 } 131 132 address Method::get_c2i_unverified_entry() { 133 assert(adapter() != NULL, "must have"); 134 return adapter()->get_c2i_unverified_entry(); 135 } 136 137 char* Method::name_and_sig_as_C_string() const { 138 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 139 } 140 141 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 142 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 143 } 144 145 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 146 const char* klass_name = klass->external_name(); 147 int klass_name_len = (int)strlen(klass_name); 148 int method_name_len = method_name->utf8_length(); 149 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 150 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 151 strcpy(dest, klass_name); 152 dest[klass_name_len] = '.'; 153 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 154 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 155 dest[len] = 0; 156 return dest; 157 } 158 159 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 160 Symbol* klass_name = klass->name(); 161 klass_name->as_klass_external_name(buf, size); 162 int len = (int)strlen(buf); 163 164 if (len < size - 1) { 165 buf[len++] = '.'; 166 167 method_name->as_C_string(&(buf[len]), size - len); 168 len = (int)strlen(buf); 169 170 signature->as_C_string(&(buf[len]), size - len); 171 } 172 173 return buf; 174 } 175 176 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) { 177 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 178 // access exception table 179 ExceptionTable table(mh()); 180 int length = table.length(); 181 // iterate through all entries sequentially 182 constantPoolHandle pool(THREAD, mh->constants()); 183 for (int i = 0; i < length; i ++) { 184 //reacquire the table in case a GC happened 185 ExceptionTable table(mh()); 186 int beg_bci = table.start_pc(i); 187 int end_bci = table.end_pc(i); 188 assert(beg_bci <= end_bci, "inconsistent exception table"); 189 if (beg_bci <= throw_bci && throw_bci < end_bci) { 190 // exception handler bci range covers throw_bci => investigate further 191 int handler_bci = table.handler_pc(i); 192 int klass_index = table.catch_type_index(i); 193 if (klass_index == 0) { 194 return handler_bci; 195 } else if (ex_klass.is_null()) { 196 return handler_bci; 197 } else { 198 // we know the exception class => get the constraint class 199 // this may require loading of the constraint class; if verification 200 // fails or some other exception occurs, return handler_bci 201 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); 202 KlassHandle klass = KlassHandle(THREAD, k); 203 assert(klass.not_null(), "klass not loaded"); 204 if (ex_klass->is_subtype_of(klass())) { 205 return handler_bci; 206 } 207 } 208 } 209 } 210 211 return -1; 212 } 213 214 void Method::mask_for(int bci, InterpreterOopMap* mask) { 215 216 Thread* myThread = Thread::current(); 217 methodHandle h_this(myThread, this); 218 #if defined(ASSERT) && !INCLUDE_JVMCI 219 bool has_capability = myThread->is_VM_thread() || 220 myThread->is_ConcurrentGC_thread() || 221 myThread->is_GC_task_thread(); 222 223 if (!has_capability) { 224 if (!VerifyStack && !VerifyLastFrame) { 225 // verify stack calls this outside VM thread 226 warning("oopmap should only be accessed by the " 227 "VM, GC task or CMS threads (or during debugging)"); 228 InterpreterOopMap local_mask; 229 method_holder()->mask_for(h_this, bci, &local_mask); 230 local_mask.print(); 231 } 232 } 233 #endif 234 method_holder()->mask_for(h_this, bci, mask); 235 return; 236 } 237 238 239 int Method::bci_from(address bcp) const { 240 if (is_native() && bcp == 0) { 241 return 0; 242 } 243 #ifdef ASSERT 244 { 245 ResourceMark rm; 246 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), 247 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", 248 p2i(bcp), name_and_sig_as_C_string()); 249 } 250 #endif 251 return bcp - code_base(); 252 } 253 254 255 int Method::validate_bci(int bci) const { 256 return (bci == 0 || bci < code_size()) ? bci : -1; 257 } 258 259 // Return bci if it appears to be a valid bcp 260 // Return -1 otherwise. 261 // Used by profiling code, when invalid data is a possibility. 262 // The caller is responsible for validating the Method* itself. 263 int Method::validate_bci_from_bcp(address bcp) const { 264 // keep bci as -1 if not a valid bci 265 int bci = -1; 266 if (bcp == 0 || bcp == code_base()) { 267 // code_size() may return 0 and we allow 0 here 268 // the method may be native 269 bci = 0; 270 } else if (contains(bcp)) { 271 bci = bcp - code_base(); 272 } 273 // Assert that if we have dodged any asserts, bci is negative. 274 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 275 return bci; 276 } 277 278 address Method::bcp_from(int bci) const { 279 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci: %d", bci); 280 address bcp = code_base() + bci; 281 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 282 return bcp; 283 } 284 285 address Method::bcp_from(address bcp) const { 286 if (is_native() && bcp == NULL) { 287 return code_base(); 288 } else { 289 return bcp; 290 } 291 } 292 293 int Method::size(bool is_native) { 294 // If native, then include pointers for native_function and signature_handler 295 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 296 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; 297 return align_metadata_size(header_size() + extra_words); 298 } 299 300 301 Symbol* Method::klass_name() const { 302 return method_holder()->name(); 303 } 304 305 306 // Attempt to return method oop to original state. Clear any pointers 307 // (to objects outside the shared spaces). We won't be able to predict 308 // where they should point in a new JVM. Further initialize some 309 // entries now in order allow them to be write protected later. 310 311 void Method::remove_unshareable_info() { 312 unlink_method(); 313 } 314 315 void Method::set_vtable_index(int index) { 316 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 317 // At runtime initialize_vtable is rerun as part of link_class_impl() 318 // for a shared class loaded by the non-boot loader to obtain the loader 319 // constraints based on the runtime classloaders' context. 320 return; // don't write into the shared class 321 } else { 322 _vtable_index = index; 323 } 324 } 325 326 void Method::set_itable_index(int index) { 327 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 328 // At runtime initialize_itable is rerun as part of link_class_impl() 329 // for a shared class loaded by the non-boot loader to obtain the loader 330 // constraints based on the runtime classloaders' context. The dumptime 331 // itable index should be the same as the runtime index. 332 assert(_vtable_index == itable_index_max - index, 333 "archived itable index is different from runtime index"); 334 return; // don’t write into the shared class 335 } else { 336 _vtable_index = itable_index_max - index; 337 } 338 assert(valid_itable_index(), ""); 339 } 340 341 342 343 bool Method::was_executed_more_than(int n) { 344 // Invocation counter is reset when the Method* is compiled. 345 // If the method has compiled code we therefore assume it has 346 // be excuted more than n times. 347 if (is_accessor() || is_empty_method() || (code() != NULL)) { 348 // interpreter doesn't bump invocation counter of trivial methods 349 // compiler does not bump invocation counter of compiled methods 350 return true; 351 } 352 else if ((method_counters() != NULL && 353 method_counters()->invocation_counter()->carry()) || 354 (method_data() != NULL && 355 method_data()->invocation_counter()->carry())) { 356 // The carry bit is set when the counter overflows and causes 357 // a compilation to occur. We don't know how many times 358 // the counter has been reset, so we simply assume it has 359 // been executed more than n times. 360 return true; 361 } else { 362 return invocation_count() > n; 363 } 364 } 365 366 void Method::print_invocation_count() { 367 if (is_static()) tty->print("static "); 368 if (is_final()) tty->print("final "); 369 if (is_synchronized()) tty->print("synchronized "); 370 if (is_native()) tty->print("native "); 371 tty->print("%s::", method_holder()->external_name()); 372 name()->print_symbol_on(tty); 373 signature()->print_symbol_on(tty); 374 375 if (WizardMode) { 376 // dump the size of the byte codes 377 tty->print(" {%d}", code_size()); 378 } 379 tty->cr(); 380 381 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 382 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 383 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 384 #ifndef PRODUCT 385 if (CountCompiledCalls) { 386 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 387 } 388 #endif 389 } 390 391 // Build a MethodData* object to hold information about this method 392 // collected in the interpreter. 393 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) { 394 // Do not profile the method if metaspace has hit an OOM previously 395 // allocating profiling data. Callers clear pending exception so don't 396 // add one here. 397 if (ClassLoaderDataGraph::has_metaspace_oom()) { 398 return; 399 } 400 401 // Grab a lock here to prevent multiple 402 // MethodData*s from being created. 403 MutexLocker ml(MethodData_lock, THREAD); 404 if (method->method_data() == NULL) { 405 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 406 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 407 if (HAS_PENDING_EXCEPTION) { 408 CompileBroker::log_metaspace_failure(); 409 ClassLoaderDataGraph::set_metaspace_oom(true); 410 return; // return the exception (which is cleared) 411 } 412 413 method->set_method_data(method_data); 414 if (PrintMethodData && (Verbose || WizardMode)) { 415 ResourceMark rm(THREAD); 416 tty->print("build_interpreter_method_data for "); 417 method->print_name(tty); 418 tty->cr(); 419 // At the end of the run, the MDO, full of data, will be dumped. 420 } 421 } 422 } 423 424 MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 425 // Do not profile the method if metaspace has hit an OOM previously 426 if (ClassLoaderDataGraph::has_metaspace_oom()) { 427 return NULL; 428 } 429 430 methodHandle mh(m); 431 MethodCounters* counters = MethodCounters::allocate(mh, THREAD); 432 if (HAS_PENDING_EXCEPTION) { 433 CompileBroker::log_metaspace_failure(); 434 ClassLoaderDataGraph::set_metaspace_oom(true); 435 return NULL; // return the exception (which is cleared) 436 } 437 if (!mh->init_method_counters(counters)) { 438 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 439 } 440 441 if (LogTouchedMethods) { 442 mh->log_touched(CHECK_NULL); 443 } 444 445 return mh->method_counters(); 446 } 447 448 void Method::cleanup_inline_caches() { 449 // The current system doesn't use inline caches in the interpreter 450 // => nothing to do (keep this method around for future use) 451 } 452 453 454 int Method::extra_stack_words() { 455 // not an inline function, to avoid a header dependency on Interpreter 456 return extra_stack_entries() * Interpreter::stackElementSize; 457 } 458 459 460 void Method::compute_size_of_parameters(Thread *thread) { 461 ArgumentSizeComputer asc(signature()); 462 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 463 } 464 465 BasicType Method::result_type() const { 466 ResultTypeFinder rtf(signature()); 467 return rtf.type(); 468 } 469 470 471 bool Method::is_empty_method() const { 472 return code_size() == 1 473 && *code_base() == Bytecodes::_return; 474 } 475 476 477 bool Method::is_vanilla_constructor() const { 478 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 479 // which only calls the superclass vanilla constructor and possibly does stores of 480 // zero constants to local fields: 481 // 482 // aload_0 483 // invokespecial 484 // indexbyte1 485 // indexbyte2 486 // 487 // followed by an (optional) sequence of: 488 // 489 // aload_0 490 // aconst_null / iconst_0 / fconst_0 / dconst_0 491 // putfield 492 // indexbyte1 493 // indexbyte2 494 // 495 // followed by: 496 // 497 // return 498 499 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 500 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 501 int size = code_size(); 502 // Check if size match 503 if (size == 0 || size % 5 != 0) return false; 504 address cb = code_base(); 505 int last = size - 1; 506 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 507 // Does not call superclass default constructor 508 return false; 509 } 510 // Check optional sequence 511 for (int i = 4; i < last; i += 5) { 512 if (cb[i] != Bytecodes::_aload_0) return false; 513 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 514 if (cb[i+2] != Bytecodes::_putfield) return false; 515 } 516 return true; 517 } 518 519 520 bool Method::compute_has_loops_flag() { 521 BytecodeStream bcs(this); 522 Bytecodes::Code bc; 523 524 while ((bc = bcs.next()) >= 0) { 525 switch( bc ) { 526 case Bytecodes::_ifeq: 527 case Bytecodes::_ifnull: 528 case Bytecodes::_iflt: 529 case Bytecodes::_ifle: 530 case Bytecodes::_ifne: 531 case Bytecodes::_ifnonnull: 532 case Bytecodes::_ifgt: 533 case Bytecodes::_ifge: 534 case Bytecodes::_if_icmpeq: 535 case Bytecodes::_if_icmpne: 536 case Bytecodes::_if_icmplt: 537 case Bytecodes::_if_icmpgt: 538 case Bytecodes::_if_icmple: 539 case Bytecodes::_if_icmpge: 540 case Bytecodes::_if_acmpeq: 541 case Bytecodes::_if_acmpne: 542 case Bytecodes::_goto: 543 case Bytecodes::_jsr: 544 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 545 break; 546 547 case Bytecodes::_goto_w: 548 case Bytecodes::_jsr_w: 549 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 550 break; 551 } 552 } 553 _access_flags.set_loops_flag_init(); 554 return _access_flags.has_loops(); 555 } 556 557 bool Method::is_final_method(AccessFlags class_access_flags) const { 558 // or "does_not_require_vtable_entry" 559 // default method or overpass can occur, is not final (reuses vtable entry) 560 // private methods get vtable entries for backward class compatibility. 561 if (is_overpass() || is_default_method()) return false; 562 return is_final() || class_access_flags.is_final(); 563 } 564 565 bool Method::is_final_method() const { 566 return is_final_method(method_holder()->access_flags()); 567 } 568 569 bool Method::is_default_method() const { 570 if (method_holder() != NULL && 571 method_holder()->is_interface() && 572 !is_abstract()) { 573 return true; 574 } else { 575 return false; 576 } 577 } 578 579 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 580 if (is_final_method(class_access_flags)) return true; 581 #ifdef ASSERT 582 ResourceMark rm; 583 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 584 if (class_access_flags.is_interface()) { 585 assert(is_nonv == is_static(), "is_nonv=%s", name_and_sig_as_C_string()); 586 } 587 #endif 588 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 589 return vtable_index() == nonvirtual_vtable_index; 590 } 591 592 bool Method::can_be_statically_bound() const { 593 return can_be_statically_bound(method_holder()->access_flags()); 594 } 595 596 bool Method::is_accessor() const { 597 return is_getter() || is_setter(); 598 } 599 600 bool Method::is_getter() const { 601 if (code_size() != 5) return false; 602 if (size_of_parameters() != 1) return false; 603 if (java_code_at(0) != Bytecodes::_aload_0) return false; 604 if (java_code_at(1) != Bytecodes::_getfield) return false; 605 switch (java_code_at(4)) { 606 case Bytecodes::_ireturn: 607 case Bytecodes::_lreturn: 608 case Bytecodes::_freturn: 609 case Bytecodes::_dreturn: 610 case Bytecodes::_areturn: 611 break; 612 default: 613 return false; 614 } 615 return true; 616 } 617 618 bool Method::is_setter() const { 619 if (code_size() != 6) return false; 620 if (java_code_at(0) != Bytecodes::_aload_0) return false; 621 switch (java_code_at(1)) { 622 case Bytecodes::_iload_1: 623 case Bytecodes::_aload_1: 624 case Bytecodes::_fload_1: 625 if (size_of_parameters() != 2) return false; 626 break; 627 case Bytecodes::_dload_1: 628 case Bytecodes::_lload_1: 629 if (size_of_parameters() != 3) return false; 630 break; 631 default: 632 return false; 633 } 634 if (java_code_at(2) != Bytecodes::_putfield) return false; 635 if (java_code_at(5) != Bytecodes::_return) return false; 636 return true; 637 } 638 639 bool Method::is_constant_getter() const { 640 int last_index = code_size() - 1; 641 // Check if the first 1-3 bytecodes are a constant push 642 // and the last bytecode is a return. 643 return (2 <= code_size() && code_size() <= 4 && 644 Bytecodes::is_const(java_code_at(0)) && 645 Bytecodes::length_for(java_code_at(0)) == last_index && 646 Bytecodes::is_return(java_code_at(last_index))); 647 } 648 649 bool Method::is_initializer() const { 650 return is_object_initializer() || is_static_initializer(); 651 } 652 653 bool Method::has_valid_initializer_flags() const { 654 return (is_static() || 655 method_holder()->major_version() < 51); 656 } 657 658 bool Method::is_static_initializer() const { 659 // For classfiles version 51 or greater, ensure that the clinit method is 660 // static. Non-static methods with the name "<clinit>" are not static 661 // initializers. (older classfiles exempted for backward compatibility) 662 return name() == vmSymbols::class_initializer_name() && 663 has_valid_initializer_flags(); 664 } 665 666 bool Method::is_object_initializer() const { 667 return name() == vmSymbols::object_initializer_name(); 668 } 669 670 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 671 int length = method->checked_exceptions_length(); 672 if (length == 0) { // common case 673 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 674 } else { 675 methodHandle h_this(THREAD, method); 676 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 677 objArrayHandle mirrors (THREAD, m_oop); 678 for (int i = 0; i < length; i++) { 679 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 680 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 681 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 682 mirrors->obj_at_put(i, k->java_mirror()); 683 } 684 return mirrors; 685 } 686 }; 687 688 689 int Method::line_number_from_bci(int bci) const { 690 if (bci == SynchronizationEntryBCI) bci = 0; 691 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 692 int best_bci = 0; 693 int best_line = -1; 694 695 if (has_linenumber_table()) { 696 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 697 // Not necessarily sorted and not necessarily one-to-one. 698 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 699 while (stream.read_pair()) { 700 if (stream.bci() == bci) { 701 // perfect match 702 return stream.line(); 703 } else { 704 // update best_bci/line 705 if (stream.bci() < bci && stream.bci() >= best_bci) { 706 best_bci = stream.bci(); 707 best_line = stream.line(); 708 } 709 } 710 } 711 } 712 return best_line; 713 } 714 715 716 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 717 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 718 Thread *thread = Thread::current(); 719 Symbol* klass_name = constants()->klass_name_at(klass_index); 720 Handle loader(thread, method_holder()->class_loader()); 721 Handle prot (thread, method_holder()->protection_domain()); 722 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 723 } else { 724 return true; 725 } 726 } 727 728 729 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 730 int klass_index = constants()->klass_ref_index_at(refinfo_index); 731 if (must_be_resolved) { 732 // Make sure klass is resolved in constantpool. 733 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 734 } 735 return is_klass_loaded_by_klass_index(klass_index); 736 } 737 738 739 void Method::set_native_function(address function, bool post_event_flag) { 740 assert(function != NULL, "use clear_native_function to unregister natives"); 741 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 742 address* native_function = native_function_addr(); 743 744 // We can see racers trying to place the same native function into place. Once 745 // is plenty. 746 address current = *native_function; 747 if (current == function) return; 748 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 749 function != NULL) { 750 // native_method_throw_unsatisfied_link_error_entry() should only 751 // be passed when post_event_flag is false. 752 assert(function != 753 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 754 "post_event_flag mis-match"); 755 756 // post the bind event, and possible change the bind function 757 JvmtiExport::post_native_method_bind(this, &function); 758 } 759 *native_function = function; 760 // This function can be called more than once. We must make sure that we always 761 // use the latest registered method -> check if a stub already has been generated. 762 // If so, we have to make it not_entrant. 763 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates 764 if (nm != NULL) { 765 nm->make_not_entrant(); 766 } 767 } 768 769 770 bool Method::has_native_function() const { 771 if (is_method_handle_intrinsic()) 772 return false; // special-cased in SharedRuntime::generate_native_wrapper 773 address func = native_function(); 774 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 775 } 776 777 778 void Method::clear_native_function() { 779 // Note: is_method_handle_intrinsic() is allowed here. 780 set_native_function( 781 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 782 !native_bind_event_is_interesting); 783 clear_code(); 784 } 785 786 address Method::critical_native_function() { 787 methodHandle mh(this); 788 return NativeLookup::lookup_critical_entry(mh); 789 } 790 791 792 void Method::set_signature_handler(address handler) { 793 address* signature_handler = signature_handler_addr(); 794 *signature_handler = handler; 795 } 796 797 798 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 799 if (PrintCompilation && report) { 800 ttyLocker ttyl; 801 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 802 if (comp_level == CompLevel_all) { 803 tty->print("all levels "); 804 } else { 805 tty->print("levels "); 806 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 807 tty->print("%d ", i); 808 } 809 } 810 this->print_short_name(tty); 811 int size = this->code_size(); 812 if (size > 0) { 813 tty->print(" (%d bytes)", size); 814 } 815 if (reason != NULL) { 816 tty->print(" %s", reason); 817 } 818 tty->cr(); 819 } 820 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 821 ttyLocker ttyl; 822 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 823 os::current_thread_id(), is_osr, comp_level); 824 if (reason != NULL) { 825 xtty->print(" reason=\'%s\'", reason); 826 } 827 xtty->method(this); 828 xtty->stamp(); 829 xtty->end_elem(); 830 } 831 } 832 833 bool Method::is_always_compilable() const { 834 // Generated adapters must be compiled 835 if (is_method_handle_intrinsic() && is_synthetic()) { 836 assert(!is_not_c1_compilable(), "sanity check"); 837 assert(!is_not_c2_compilable(), "sanity check"); 838 return true; 839 } 840 841 return false; 842 } 843 844 bool Method::is_not_compilable(int comp_level) const { 845 if (number_of_breakpoints() > 0) 846 return true; 847 if (is_always_compilable()) 848 return false; 849 if (comp_level == CompLevel_any) 850 return is_not_c1_compilable() || is_not_c2_compilable(); 851 if (is_c1_compile(comp_level)) 852 return is_not_c1_compilable(); 853 if (is_c2_compile(comp_level)) 854 return is_not_c2_compilable(); 855 return false; 856 } 857 858 // call this when compiler finds that this method is not compilable 859 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 860 if (is_always_compilable()) { 861 // Don't mark a method which should be always compilable 862 return; 863 } 864 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 865 if (comp_level == CompLevel_all) { 866 set_not_c1_compilable(); 867 set_not_c2_compilable(); 868 } else { 869 if (is_c1_compile(comp_level)) 870 set_not_c1_compilable(); 871 if (is_c2_compile(comp_level)) 872 set_not_c2_compilable(); 873 } 874 CompilationPolicy::policy()->disable_compilation(this); 875 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 876 } 877 878 bool Method::is_not_osr_compilable(int comp_level) const { 879 if (is_not_compilable(comp_level)) 880 return true; 881 if (comp_level == CompLevel_any) 882 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 883 if (is_c1_compile(comp_level)) 884 return is_not_c1_osr_compilable(); 885 if (is_c2_compile(comp_level)) 886 return is_not_c2_osr_compilable(); 887 return false; 888 } 889 890 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 891 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 892 if (comp_level == CompLevel_all) { 893 set_not_c1_osr_compilable(); 894 set_not_c2_osr_compilable(); 895 } else { 896 if (is_c1_compile(comp_level)) 897 set_not_c1_osr_compilable(); 898 if (is_c2_compile(comp_level)) 899 set_not_c2_osr_compilable(); 900 } 901 CompilationPolicy::policy()->disable_compilation(this); 902 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 903 } 904 905 // Revert to using the interpreter and clear out the nmethod 906 void Method::clear_code() { 907 908 // this may be NULL if c2i adapters have not been made yet 909 // Only should happen at allocate time. 910 if (adapter() == NULL) { 911 _from_compiled_entry = NULL; 912 } else { 913 _from_compiled_entry = adapter()->get_c2i_entry(); 914 } 915 OrderAccess::storestore(); 916 _from_interpreted_entry = _i2i_entry; 917 OrderAccess::storestore(); 918 _code = NULL; 919 } 920 921 #if INCLUDE_CDS 922 // Called by class data sharing to remove any entry points (which are not shared) 923 void Method::unlink_method() { 924 _code = NULL; 925 926 assert(DumpSharedSpaces, "dump time only"); 927 // Set the values to what they should be at run time. Note that 928 // this Method can no longer be executed during dump time. 929 _i2i_entry = Interpreter::entry_for_cds_method(this); 930 _from_interpreted_entry = _i2i_entry; 931 932 if (is_native()) { 933 *native_function_addr() = NULL; 934 set_signature_handler(NULL); 935 } 936 NOT_PRODUCT(set_compiled_invocation_count(0);) 937 938 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter(); 939 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline()); 940 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline(); 941 assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time"); 942 943 944 // In case of DumpSharedSpaces, _method_data should always be NULL. 945 assert(_method_data == NULL, "unexpected method data?"); 946 947 set_method_data(NULL); 948 clear_method_counters(); 949 } 950 #endif 951 952 // Called when the method_holder is getting linked. Setup entrypoints so the method 953 // is ready to be called from interpreter, compiler, and vtables. 954 void Method::link_method(const methodHandle& h_method, TRAPS) { 955 // If the code cache is full, we may reenter this function for the 956 // leftover methods that weren't linked. 957 if (is_shared()) { 958 if (adapter() != NULL) return; 959 } else { 960 if (_i2i_entry != NULL) return; 961 962 assert(adapter() == NULL, "init'd to NULL" ); 963 } 964 assert( _code == NULL, "nothing compiled yet" ); 965 966 // Setup interpreter entrypoint 967 assert(this == h_method(), "wrong h_method()" ); 968 address entry; 969 970 if (this->is_shared()) { 971 entry = Interpreter::entry_for_cds_method(h_method); 972 } else { 973 entry = Interpreter::entry_for_method(h_method); 974 } 975 assert(entry != NULL, "interpreter entry must be non-null"); 976 if (is_shared()) { 977 assert(entry == _i2i_entry && entry == _from_interpreted_entry, 978 "should be correctly set during dump time"); 979 } else { 980 // Sets both _i2i_entry and _from_interpreted_entry 981 set_interpreter_entry(entry); 982 } 983 984 // Don't overwrite already registered native entries. 985 if (is_native() && !has_native_function()) { 986 set_native_function( 987 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 988 !native_bind_event_is_interesting); 989 } 990 991 // Setup compiler entrypoint. This is made eagerly, so we do not need 992 // special handling of vtables. An alternative is to make adapters more 993 // lazily by calling make_adapter() from from_compiled_entry() for the 994 // normal calls. For vtable calls life gets more complicated. When a 995 // call-site goes mega-morphic we need adapters in all methods which can be 996 // called from the vtable. We need adapters on such methods that get loaded 997 // later. Ditto for mega-morphic itable calls. If this proves to be a 998 // problem we'll make these lazily later. 999 (void) make_adapters(h_method, CHECK); 1000 1001 // ONLY USE the h_method now as make_adapter may have blocked 1002 1003 } 1004 1005 address Method::make_adapters(methodHandle mh, TRAPS) { 1006 // Adapters for compiled code are made eagerly here. They are fairly 1007 // small (generally < 100 bytes) and quick to make (and cached and shared) 1008 // so making them eagerly shouldn't be too expensive. 1009 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1010 if (adapter == NULL ) { 1011 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters"); 1012 } 1013 1014 if (mh->is_shared()) { 1015 assert(mh->adapter() == adapter, "must be"); 1016 assert(mh->_from_compiled_entry != NULL, "must be"); // FIXME, the instructions also not NULL 1017 } else { 1018 mh->set_adapter_entry(adapter); 1019 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1020 } 1021 return adapter->get_c2i_entry(); 1022 } 1023 1024 void Method::restore_unshareable_info(TRAPS) { 1025 // Since restore_unshareable_info can be called more than once for a method, don't 1026 // redo any work. If this field is restored, there is nothing to do. 1027 if (_from_compiled_entry == NULL) { 1028 // restore method's vtable by calling a virtual function 1029 restore_vtable(); 1030 1031 methodHandle mh(THREAD, this); 1032 link_method(mh, CHECK); 1033 } 1034 } 1035 1036 volatile address Method::from_compiled_entry_no_trampoline() const { 1037 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 1038 if (code) { 1039 return code->verified_entry_point(); 1040 } else { 1041 return adapter()->get_c2i_entry(); 1042 } 1043 } 1044 1045 // The verified_code_entry() must be called when a invoke is resolved 1046 // on this method. 1047 1048 // It returns the compiled code entry point, after asserting not null. 1049 // This function is called after potential safepoints so that nmethod 1050 // or adapter that it points to is still live and valid. 1051 // This function must not hit a safepoint! 1052 address Method::verified_code_entry() { 1053 debug_only(NoSafepointVerifier nsv;) 1054 assert(_from_compiled_entry != NULL, "must be set"); 1055 return _from_compiled_entry; 1056 } 1057 1058 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1059 // (could be racing a deopt). 1060 // Not inline to avoid circular ref. 1061 bool Method::check_code() const { 1062 // cached in a register or local. There's a race on the value of the field. 1063 CompiledMethod *code = (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code); 1064 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 1065 } 1066 1067 // Install compiled code. Instantly it can execute. 1068 void Method::set_code(methodHandle mh, CompiledMethod *code) { 1069 assert( code, "use clear_code to remove code" ); 1070 assert( mh->check_code(), "" ); 1071 1072 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 1073 1074 // These writes must happen in this order, because the interpreter will 1075 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1076 // which jumps to _from_compiled_entry. 1077 mh->_code = code; // Assign before allowing compiled code to exec 1078 1079 int comp_level = code->comp_level(); 1080 // In theory there could be a race here. In practice it is unlikely 1081 // and not worth worrying about. 1082 if (comp_level > mh->highest_comp_level()) { 1083 mh->set_highest_comp_level(comp_level); 1084 } 1085 1086 OrderAccess::storestore(); 1087 #ifdef SHARK 1088 mh->_from_interpreted_entry = code->insts_begin(); 1089 #else //!SHARK 1090 mh->_from_compiled_entry = code->verified_entry_point(); 1091 OrderAccess::storestore(); 1092 // Instantly compiled code can execute. 1093 if (!mh->is_method_handle_intrinsic()) 1094 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1095 #endif //!SHARK 1096 } 1097 1098 1099 bool Method::is_overridden_in(Klass* k) const { 1100 InstanceKlass* ik = InstanceKlass::cast(k); 1101 1102 if (ik->is_interface()) return false; 1103 1104 // If method is an interface, we skip it - except if it 1105 // is a miranda method 1106 if (method_holder()->is_interface()) { 1107 // Check that method is not a miranda method 1108 if (ik->lookup_method(name(), signature()) == NULL) { 1109 // No implementation exist - so miranda method 1110 return false; 1111 } 1112 return true; 1113 } 1114 1115 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1116 assert(ik->vtable() != NULL, "vtable should exist"); 1117 if (!has_vtable_index()) { 1118 return false; 1119 } else { 1120 Method* vt_m = ik->method_at_vtable(vtable_index()); 1121 return vt_m != this; 1122 } 1123 } 1124 1125 1126 // give advice about whether this Method* should be cached or not 1127 bool Method::should_not_be_cached() const { 1128 if (is_old()) { 1129 // This method has been redefined. It is either EMCP or obsolete 1130 // and we don't want to cache it because that would pin the method 1131 // down and prevent it from being collectible if and when it 1132 // finishes executing. 1133 return true; 1134 } 1135 1136 // caching this method should be just fine 1137 return false; 1138 } 1139 1140 1141 /** 1142 * Returns true if this is one of the specially treated methods for 1143 * security related stack walks (like Reflection.getCallerClass). 1144 */ 1145 bool Method::is_ignored_by_security_stack_walk() const { 1146 if (intrinsic_id() == vmIntrinsics::_invoke) { 1147 // This is Method.invoke() -- ignore it 1148 return true; 1149 } 1150 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1151 // This is an auxilary frame -- ignore it 1152 return true; 1153 } 1154 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1155 // This is an internal adapter frame for method handles -- ignore it 1156 return true; 1157 } 1158 return false; 1159 } 1160 1161 1162 // Constant pool structure for invoke methods: 1163 enum { 1164 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1165 _imcp_invoke_signature, // utf8: (variable Symbol*) 1166 _imcp_limit 1167 }; 1168 1169 // Test if this method is an MH adapter frame generated by Java code. 1170 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1171 bool Method::is_compiled_lambda_form() const { 1172 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1173 } 1174 1175 // Test if this method is an internal MH primitive method. 1176 bool Method::is_method_handle_intrinsic() const { 1177 vmIntrinsics::ID iid = intrinsic_id(); 1178 return (MethodHandles::is_signature_polymorphic(iid) && 1179 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1180 } 1181 1182 bool Method::has_member_arg() const { 1183 vmIntrinsics::ID iid = intrinsic_id(); 1184 return (MethodHandles::is_signature_polymorphic(iid) && 1185 MethodHandles::has_member_arg(iid)); 1186 } 1187 1188 // Make an instance of a signature-polymorphic internal MH primitive. 1189 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1190 Symbol* signature, 1191 TRAPS) { 1192 ResourceMark rm; 1193 methodHandle empty; 1194 1195 KlassHandle holder = SystemDictionary::MethodHandle_klass(); 1196 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1197 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1198 if (TraceMethodHandles) { 1199 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1200 } 1201 1202 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1203 name->increment_refcount(); 1204 signature->increment_refcount(); 1205 1206 int cp_length = _imcp_limit; 1207 ClassLoaderData* loader_data = holder->class_loader_data(); 1208 constantPoolHandle cp; 1209 { 1210 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1211 cp = constantPoolHandle(THREAD, cp_oop); 1212 } 1213 cp->set_pool_holder(InstanceKlass::cast(holder())); 1214 cp->symbol_at_put(_imcp_invoke_name, name); 1215 cp->symbol_at_put(_imcp_invoke_signature, signature); 1216 cp->set_has_preresolution(); 1217 1218 // decide on access bits: public or not? 1219 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1220 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1221 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1222 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1223 1224 methodHandle m; 1225 { 1226 InlineTableSizes sizes; 1227 Method* m_oop = Method::allocate(loader_data, 0, 1228 accessFlags_from(flags_bits), &sizes, 1229 ConstMethod::NORMAL, CHECK_(empty)); 1230 m = methodHandle(THREAD, m_oop); 1231 } 1232 m->set_constants(cp()); 1233 m->set_name_index(_imcp_invoke_name); 1234 m->set_signature_index(_imcp_invoke_signature); 1235 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1236 assert(m->signature() == signature, ""); 1237 ResultTypeFinder rtf(signature); 1238 m->constMethod()->set_result_type(rtf.type()); 1239 m->compute_size_of_parameters(THREAD); 1240 m->init_intrinsic_id(); 1241 assert(m->is_method_handle_intrinsic(), ""); 1242 #ifdef ASSERT 1243 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1244 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1245 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1246 #endif //ASSERT 1247 1248 // Finally, set up its entry points. 1249 assert(m->can_be_statically_bound(), ""); 1250 m->set_vtable_index(Method::nonvirtual_vtable_index); 1251 m->link_method(m, CHECK_(empty)); 1252 1253 if (TraceMethodHandles && (Verbose || WizardMode)) { 1254 ttyLocker ttyl; 1255 m->print_on(tty); 1256 } 1257 1258 return m; 1259 } 1260 1261 Klass* Method::check_non_bcp_klass(Klass* klass) { 1262 if (klass != NULL && klass->class_loader() != NULL) { 1263 if (klass->is_objArray_klass()) 1264 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1265 return klass; 1266 } 1267 return NULL; 1268 } 1269 1270 1271 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1272 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1273 // Code below does not work for native methods - they should never get rewritten anyway 1274 assert(!m->is_native(), "cannot rewrite native methods"); 1275 // Allocate new Method* 1276 AccessFlags flags = m->access_flags(); 1277 1278 ConstMethod* cm = m->constMethod(); 1279 int checked_exceptions_len = cm->checked_exceptions_length(); 1280 int localvariable_len = cm->localvariable_table_length(); 1281 int exception_table_len = cm->exception_table_length(); 1282 int method_parameters_len = cm->method_parameters_length(); 1283 int method_annotations_len = cm->method_annotations_length(); 1284 int parameter_annotations_len = cm->parameter_annotations_length(); 1285 int type_annotations_len = cm->type_annotations_length(); 1286 int default_annotations_len = cm->default_annotations_length(); 1287 1288 InlineTableSizes sizes( 1289 localvariable_len, 1290 new_compressed_linenumber_size, 1291 exception_table_len, 1292 checked_exceptions_len, 1293 method_parameters_len, 1294 cm->generic_signature_index(), 1295 method_annotations_len, 1296 parameter_annotations_len, 1297 type_annotations_len, 1298 default_annotations_len, 1299 0); 1300 1301 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1302 Method* newm_oop = Method::allocate(loader_data, 1303 new_code_length, 1304 flags, 1305 &sizes, 1306 m->method_type(), 1307 CHECK_(methodHandle())); 1308 methodHandle newm (THREAD, newm_oop); 1309 1310 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1311 ConstMethod* newcm = newm->constMethod(); 1312 int new_const_method_size = newm->constMethod()->size(); 1313 1314 memcpy(newm(), m(), sizeof(Method)); 1315 1316 // Create shallow copy of ConstMethod. 1317 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1318 1319 // Reset correct method/const method, method size, and parameter info 1320 newm->set_constMethod(newcm); 1321 newm->constMethod()->set_code_size(new_code_length); 1322 newm->constMethod()->set_constMethod_size(new_const_method_size); 1323 assert(newm->code_size() == new_code_length, "check"); 1324 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1325 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1326 assert(newm->exception_table_length() == exception_table_len, "check"); 1327 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1328 // Copy new byte codes 1329 memcpy(newm->code_base(), new_code, new_code_length); 1330 // Copy line number table 1331 if (new_compressed_linenumber_size > 0) { 1332 memcpy(newm->compressed_linenumber_table(), 1333 new_compressed_linenumber_table, 1334 new_compressed_linenumber_size); 1335 } 1336 // Copy method_parameters 1337 if (method_parameters_len > 0) { 1338 memcpy(newm->method_parameters_start(), 1339 m->method_parameters_start(), 1340 method_parameters_len * sizeof(MethodParametersElement)); 1341 } 1342 // Copy checked_exceptions 1343 if (checked_exceptions_len > 0) { 1344 memcpy(newm->checked_exceptions_start(), 1345 m->checked_exceptions_start(), 1346 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1347 } 1348 // Copy exception table 1349 if (exception_table_len > 0) { 1350 memcpy(newm->exception_table_start(), 1351 m->exception_table_start(), 1352 exception_table_len * sizeof(ExceptionTableElement)); 1353 } 1354 // Copy local variable number table 1355 if (localvariable_len > 0) { 1356 memcpy(newm->localvariable_table_start(), 1357 m->localvariable_table_start(), 1358 localvariable_len * sizeof(LocalVariableTableElement)); 1359 } 1360 // Copy stackmap table 1361 if (m->has_stackmap_table()) { 1362 int code_attribute_length = m->stackmap_data()->length(); 1363 Array<u1>* stackmap_data = 1364 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1365 memcpy((void*)stackmap_data->adr_at(0), 1366 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1367 newm->set_stackmap_data(stackmap_data); 1368 } 1369 1370 // copy annotations over to new method 1371 newcm->copy_annotations_from(cm); 1372 return newm; 1373 } 1374 1375 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) { 1376 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1377 // because we are not loading from core libraries 1378 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1379 // which does not use the class default class loader so we check for its loader here 1380 const InstanceKlass* ik = InstanceKlass::cast(holder); 1381 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1382 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1383 } 1384 1385 // see if the klass name is well-known: 1386 Symbol* klass_name = ik->name(); 1387 return vmSymbols::find_sid(klass_name); 1388 } 1389 1390 void Method::init_intrinsic_id() { 1391 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1392 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1393 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1394 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1395 1396 // the klass name is well-known: 1397 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1398 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1399 1400 // ditto for method and signature: 1401 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1402 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1403 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1404 && name_id == vmSymbols::NO_SID) { 1405 return; 1406 } 1407 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1408 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1409 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1410 && sig_id == vmSymbols::NO_SID) { 1411 return; 1412 } 1413 jshort flags = access_flags().as_short(); 1414 1415 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1416 if (id != vmIntrinsics::_none) { 1417 set_intrinsic_id(id); 1418 if (id == vmIntrinsics::_Class_cast) { 1419 // Even if the intrinsic is rejected, we want to inline this simple method. 1420 set_force_inline(true); 1421 } 1422 return; 1423 } 1424 1425 // A few slightly irregular cases: 1426 switch (klass_id) { 1427 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1428 // Second chance: check in regular Math. 1429 switch (name_id) { 1430 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1431 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1432 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1433 // pretend it is the corresponding method in the non-strict class: 1434 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1435 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1436 break; 1437 } 1438 break; 1439 1440 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1441 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1442 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1443 if (!is_native()) break; 1444 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1445 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1446 id = vmIntrinsics::_none; 1447 break; 1448 } 1449 1450 if (id != vmIntrinsics::_none) { 1451 // Set up its iid. It is an alias method. 1452 set_intrinsic_id(id); 1453 return; 1454 } 1455 } 1456 1457 // These two methods are static since a GC may move the Method 1458 bool Method::load_signature_classes(methodHandle m, TRAPS) { 1459 if (!THREAD->can_call_java()) { 1460 // There is nothing useful this routine can do from within the Compile thread. 1461 // Hopefully, the signature contains only well-known classes. 1462 // We could scan for this and return true/false, but the caller won't care. 1463 return false; 1464 } 1465 bool sig_is_loaded = true; 1466 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1467 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1468 ResourceMark rm(THREAD); 1469 Symbol* signature = m->signature(); 1470 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1471 if (ss.is_object()) { 1472 Symbol* sym = ss.as_symbol(CHECK_(false)); 1473 Symbol* name = sym; 1474 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1475 protection_domain, THREAD); 1476 // We are loading classes eagerly. If a ClassNotFoundException or 1477 // a LinkageError was generated, be sure to ignore it. 1478 if (HAS_PENDING_EXCEPTION) { 1479 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1480 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1481 CLEAR_PENDING_EXCEPTION; 1482 } else { 1483 return false; 1484 } 1485 } 1486 if( klass == NULL) { sig_is_loaded = false; } 1487 } 1488 } 1489 return sig_is_loaded; 1490 } 1491 1492 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1493 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1494 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1495 ResourceMark rm(THREAD); 1496 Symbol* signature = m->signature(); 1497 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1498 if (ss.type() == T_OBJECT) { 1499 Symbol* name = ss.as_symbol_or_null(); 1500 if (name == NULL) return true; 1501 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1502 if (klass == NULL) return true; 1503 } 1504 } 1505 return false; 1506 } 1507 1508 // Exposed so field engineers can debug VM 1509 void Method::print_short_name(outputStream* st) { 1510 ResourceMark rm; 1511 #ifdef PRODUCT 1512 st->print(" %s::", method_holder()->external_name()); 1513 #else 1514 st->print(" %s::", method_holder()->internal_name()); 1515 #endif 1516 name()->print_symbol_on(st); 1517 if (WizardMode) signature()->print_symbol_on(st); 1518 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1519 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1520 } 1521 1522 // Comparer for sorting an object array containing 1523 // Method*s. 1524 static int method_comparator(Method* a, Method* b) { 1525 return a->name()->fast_compare(b->name()); 1526 } 1527 1528 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1529 // default_methods also uses this without the ordering for fast find_method 1530 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) { 1531 int length = methods->length(); 1532 if (length > 1) { 1533 { 1534 NoSafepointVerifier nsv; 1535 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); 1536 } 1537 // Reset method ordering 1538 if (set_idnums) { 1539 for (int i = 0; i < length; i++) { 1540 Method* m = methods->at(i); 1541 m->set_method_idnum(i); 1542 m->set_orig_method_idnum(i); 1543 } 1544 } 1545 } 1546 } 1547 1548 //----------------------------------------------------------------------------------- 1549 // Non-product code unless JVM/TI needs it 1550 1551 #if !defined(PRODUCT) || INCLUDE_JVMTI 1552 class SignatureTypePrinter : public SignatureTypeNames { 1553 private: 1554 outputStream* _st; 1555 bool _use_separator; 1556 1557 void type_name(const char* name) { 1558 if (_use_separator) _st->print(", "); 1559 _st->print("%s", name); 1560 _use_separator = true; 1561 } 1562 1563 public: 1564 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1565 _st = st; 1566 _use_separator = false; 1567 } 1568 1569 void print_parameters() { _use_separator = false; iterate_parameters(); } 1570 void print_returntype() { _use_separator = false; iterate_returntype(); } 1571 }; 1572 1573 1574 void Method::print_name(outputStream* st) { 1575 Thread *thread = Thread::current(); 1576 ResourceMark rm(thread); 1577 st->print("%s ", is_static() ? "static" : "virtual"); 1578 if (WizardMode) { 1579 st->print("%s.", method_holder()->internal_name()); 1580 name()->print_symbol_on(st); 1581 signature()->print_symbol_on(st); 1582 } else { 1583 SignatureTypePrinter sig(signature(), st); 1584 sig.print_returntype(); 1585 st->print(" %s.", method_holder()->internal_name()); 1586 name()->print_symbol_on(st); 1587 st->print("("); 1588 sig.print_parameters(); 1589 st->print(")"); 1590 } 1591 } 1592 #endif // !PRODUCT || INCLUDE_JVMTI 1593 1594 1595 void Method::print_codes_on(outputStream* st) const { 1596 print_codes_on(0, code_size(), st); 1597 } 1598 1599 void Method::print_codes_on(int from, int to, outputStream* st) const { 1600 Thread *thread = Thread::current(); 1601 ResourceMark rm(thread); 1602 methodHandle mh (thread, (Method*)this); 1603 BytecodeStream s(mh); 1604 s.set_interval(from, to); 1605 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1606 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1607 } 1608 1609 1610 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1611 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1612 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1613 // as end-of-stream terminator. 1614 1615 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1616 // bci and line number does not compress into single byte. 1617 // Write out escape character and use regular compression for bci and line number. 1618 write_byte((jubyte)0xFF); 1619 write_signed_int(bci_delta); 1620 write_signed_int(line_delta); 1621 } 1622 1623 // See comment in method.hpp which explains why this exists. 1624 #if defined(_M_AMD64) && _MSC_VER >= 1400 1625 #pragma optimize("", off) 1626 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1627 write_pair_inline(bci, line); 1628 } 1629 #pragma optimize("", on) 1630 #endif 1631 1632 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1633 _bci = 0; 1634 _line = 0; 1635 }; 1636 1637 1638 bool CompressedLineNumberReadStream::read_pair() { 1639 jubyte next = read_byte(); 1640 // Check for terminator 1641 if (next == 0) return false; 1642 if (next == 0xFF) { 1643 // Escape character, regular compression used 1644 _bci += read_signed_int(); 1645 _line += read_signed_int(); 1646 } else { 1647 // Single byte compression used 1648 _bci += next >> 3; 1649 _line += next & 0x7; 1650 } 1651 return true; 1652 } 1653 1654 #if INCLUDE_JVMTI 1655 1656 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1657 BreakpointInfo* bp = method_holder()->breakpoints(); 1658 for (; bp != NULL; bp = bp->next()) { 1659 if (bp->match(this, bci)) { 1660 return bp->orig_bytecode(); 1661 } 1662 } 1663 { 1664 ResourceMark rm; 1665 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1666 } 1667 return Bytecodes::_shouldnotreachhere; 1668 } 1669 1670 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1671 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1672 BreakpointInfo* bp = method_holder()->breakpoints(); 1673 for (; bp != NULL; bp = bp->next()) { 1674 if (bp->match(this, bci)) { 1675 bp->set_orig_bytecode(code); 1676 // and continue, in case there is more than one 1677 } 1678 } 1679 } 1680 1681 void Method::set_breakpoint(int bci) { 1682 InstanceKlass* ik = method_holder(); 1683 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1684 bp->set_next(ik->breakpoints()); 1685 ik->set_breakpoints(bp); 1686 // do this last: 1687 bp->set(this); 1688 } 1689 1690 static void clear_matches(Method* m, int bci) { 1691 InstanceKlass* ik = m->method_holder(); 1692 BreakpointInfo* prev_bp = NULL; 1693 BreakpointInfo* next_bp; 1694 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1695 next_bp = bp->next(); 1696 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1697 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1698 // do this first: 1699 bp->clear(m); 1700 // unhook it 1701 if (prev_bp != NULL) 1702 prev_bp->set_next(next_bp); 1703 else 1704 ik->set_breakpoints(next_bp); 1705 delete bp; 1706 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1707 // at same location. So we have multiple matching (method_index and bci) 1708 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1709 // breakpoint for clear_breakpoint request and keep all other method versions 1710 // BreakpointInfo for future clear_breakpoint request. 1711 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1712 // which is being called when class is unloaded. We delete all the Breakpoint 1713 // information for all versions of method. We may not correctly restore the original 1714 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1715 // so these methods won't be used anymore. 1716 if (bci >= 0) { 1717 break; 1718 } 1719 } else { 1720 // This one is a keeper. 1721 prev_bp = bp; 1722 } 1723 } 1724 } 1725 1726 void Method::clear_breakpoint(int bci) { 1727 assert(bci >= 0, ""); 1728 clear_matches(this, bci); 1729 } 1730 1731 void Method::clear_all_breakpoints() { 1732 clear_matches(this, -1); 1733 } 1734 1735 #endif // INCLUDE_JVMTI 1736 1737 int Method::invocation_count() { 1738 MethodCounters *mcs = method_counters(); 1739 if (TieredCompilation) { 1740 MethodData* const mdo = method_data(); 1741 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1742 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1743 return InvocationCounter::count_limit; 1744 } else { 1745 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1746 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1747 } 1748 } else { 1749 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1750 } 1751 } 1752 1753 int Method::backedge_count() { 1754 MethodCounters *mcs = method_counters(); 1755 if (TieredCompilation) { 1756 MethodData* const mdo = method_data(); 1757 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1758 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1759 return InvocationCounter::count_limit; 1760 } else { 1761 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1762 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1763 } 1764 } else { 1765 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1766 } 1767 } 1768 1769 int Method::highest_comp_level() const { 1770 const MethodCounters* mcs = method_counters(); 1771 if (mcs != NULL) { 1772 return mcs->highest_comp_level(); 1773 } else { 1774 return CompLevel_none; 1775 } 1776 } 1777 1778 int Method::highest_osr_comp_level() const { 1779 const MethodCounters* mcs = method_counters(); 1780 if (mcs != NULL) { 1781 return mcs->highest_osr_comp_level(); 1782 } else { 1783 return CompLevel_none; 1784 } 1785 } 1786 1787 void Method::set_highest_comp_level(int level) { 1788 MethodCounters* mcs = method_counters(); 1789 if (mcs != NULL) { 1790 mcs->set_highest_comp_level(level); 1791 } 1792 } 1793 1794 void Method::set_highest_osr_comp_level(int level) { 1795 MethodCounters* mcs = method_counters(); 1796 if (mcs != NULL) { 1797 mcs->set_highest_osr_comp_level(level); 1798 } 1799 } 1800 1801 #if INCLUDE_JVMTI 1802 1803 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1804 _bci = bci; 1805 _name_index = m->name_index(); 1806 _signature_index = m->signature_index(); 1807 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1808 if (_orig_bytecode == Bytecodes::_breakpoint) 1809 _orig_bytecode = m->orig_bytecode_at(_bci); 1810 _next = NULL; 1811 } 1812 1813 void BreakpointInfo::set(Method* method) { 1814 #ifdef ASSERT 1815 { 1816 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1817 if (code == Bytecodes::_breakpoint) 1818 code = method->orig_bytecode_at(_bci); 1819 assert(orig_bytecode() == code, "original bytecode must be the same"); 1820 } 1821 #endif 1822 Thread *thread = Thread::current(); 1823 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1824 method->incr_number_of_breakpoints(thread); 1825 SystemDictionary::notice_modification(); 1826 { 1827 // Deoptimize all dependents on this method 1828 HandleMark hm(thread); 1829 methodHandle mh(thread, method); 1830 CodeCache::flush_dependents_on_method(mh); 1831 } 1832 } 1833 1834 void BreakpointInfo::clear(Method* method) { 1835 *method->bcp_from(_bci) = orig_bytecode(); 1836 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1837 method->decr_number_of_breakpoints(Thread::current()); 1838 } 1839 1840 #endif // INCLUDE_JVMTI 1841 1842 // jmethodID handling 1843 1844 // This is a block allocating object, sort of like JNIHandleBlock, only a 1845 // lot simpler. 1846 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1847 // never get rid of it. 1848 1849 static const int min_block_size = 8; 1850 1851 class JNIMethodBlockNode : public CHeapObj<mtClass> { 1852 friend class JNIMethodBlock; 1853 Method** _methods; 1854 int _number_of_methods; 1855 int _top; 1856 JNIMethodBlockNode* _next; 1857 1858 public: 1859 1860 JNIMethodBlockNode(int num_methods = min_block_size); 1861 1862 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 1863 1864 void ensure_methods(int num_addl_methods) { 1865 if (_top < _number_of_methods) { 1866 num_addl_methods -= _number_of_methods - _top; 1867 if (num_addl_methods <= 0) { 1868 return; 1869 } 1870 } 1871 if (_next == NULL) { 1872 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 1873 } else { 1874 _next->ensure_methods(num_addl_methods); 1875 } 1876 } 1877 }; 1878 1879 class JNIMethodBlock : public CHeapObj<mtClass> { 1880 JNIMethodBlockNode _head; 1881 JNIMethodBlockNode *_last_free; 1882 public: 1883 static Method* const _free_method; 1884 1885 JNIMethodBlock(int initial_capacity = min_block_size) 1886 : _head(initial_capacity), _last_free(&_head) {} 1887 1888 void ensure_methods(int num_addl_methods) { 1889 _last_free->ensure_methods(num_addl_methods); 1890 } 1891 1892 Method** add_method(Method* m) { 1893 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) { 1894 if (b->_top < b->_number_of_methods) { 1895 // top points to the next free entry. 1896 int i = b->_top; 1897 b->_methods[i] = m; 1898 b->_top++; 1899 _last_free = b; 1900 return &(b->_methods[i]); 1901 } else if (b->_top == b->_number_of_methods) { 1902 // if the next free entry ran off the block see if there's a free entry 1903 for (int i = 0; i < b->_number_of_methods; i++) { 1904 if (b->_methods[i] == _free_method) { 1905 b->_methods[i] = m; 1906 _last_free = b; 1907 return &(b->_methods[i]); 1908 } 1909 } 1910 // Only check each block once for frees. They're very unlikely. 1911 // Increment top past the end of the block. 1912 b->_top++; 1913 } 1914 // need to allocate a next block. 1915 if (b->_next == NULL) { 1916 b->_next = _last_free = new JNIMethodBlockNode(); 1917 } 1918 } 1919 guarantee(false, "Should always allocate a free block"); 1920 return NULL; 1921 } 1922 1923 bool contains(Method** m) { 1924 if (m == NULL) return false; 1925 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 1926 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 1927 // This is a bit of extra checking, for two reasons. One is 1928 // that contains() deals with pointers that are passed in by 1929 // JNI code, so making sure that the pointer is aligned 1930 // correctly is valuable. The other is that <= and > are 1931 // technically not defined on pointers, so the if guard can 1932 // pass spuriously; no modern compiler is likely to make that 1933 // a problem, though (and if one did, the guard could also 1934 // fail spuriously, which would be bad). 1935 ptrdiff_t idx = m - b->_methods; 1936 if (b->_methods + idx == m) { 1937 return true; 1938 } 1939 } 1940 } 1941 return false; // not found 1942 } 1943 1944 // Doesn't really destroy it, just marks it as free so it can be reused. 1945 void destroy_method(Method** m) { 1946 #ifdef ASSERT 1947 assert(contains(m), "should be a methodID"); 1948 #endif // ASSERT 1949 *m = _free_method; 1950 } 1951 1952 // During class unloading the methods are cleared, which is different 1953 // than freed. 1954 void clear_all_methods() { 1955 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 1956 for (int i = 0; i< b->_number_of_methods; i++) { 1957 b->_methods[i] = NULL; 1958 } 1959 } 1960 } 1961 #ifndef PRODUCT 1962 int count_methods() { 1963 // count all allocated methods 1964 int count = 0; 1965 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 1966 for (int i = 0; i< b->_number_of_methods; i++) { 1967 if (b->_methods[i] != _free_method) count++; 1968 } 1969 } 1970 return count; 1971 } 1972 #endif // PRODUCT 1973 }; 1974 1975 // Something that can't be mistaken for an address or a markOop 1976 Method* const JNIMethodBlock::_free_method = (Method*)55; 1977 1978 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) { 1979 _number_of_methods = MAX2(num_methods, min_block_size); 1980 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 1981 for (int i = 0; i < _number_of_methods; i++) { 1982 _methods[i] = JNIMethodBlock::_free_method; 1983 } 1984 } 1985 1986 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) { 1987 ClassLoaderData* cld = loader_data; 1988 if (!SafepointSynchronize::is_at_safepoint()) { 1989 // Have to add jmethod_ids() to class loader data thread-safely. 1990 // Also have to add the method to the list safely, which the cld lock 1991 // protects as well. 1992 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 1993 if (cld->jmethod_ids() == NULL) { 1994 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 1995 } else { 1996 cld->jmethod_ids()->ensure_methods(capacity); 1997 } 1998 } else { 1999 // At safepoint, we are single threaded and can set this. 2000 if (cld->jmethod_ids() == NULL) { 2001 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2002 } else { 2003 cld->jmethod_ids()->ensure_methods(capacity); 2004 } 2005 } 2006 } 2007 2008 // Add a method id to the jmethod_ids 2009 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 2010 ClassLoaderData* cld = loader_data; 2011 2012 if (!SafepointSynchronize::is_at_safepoint()) { 2013 // Have to add jmethod_ids() to class loader data thread-safely. 2014 // Also have to add the method to the list safely, which the cld lock 2015 // protects as well. 2016 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2017 if (cld->jmethod_ids() == NULL) { 2018 cld->set_jmethod_ids(new JNIMethodBlock()); 2019 } 2020 // jmethodID is a pointer to Method* 2021 return (jmethodID)cld->jmethod_ids()->add_method(m); 2022 } else { 2023 // At safepoint, we are single threaded and can set this. 2024 if (cld->jmethod_ids() == NULL) { 2025 cld->set_jmethod_ids(new JNIMethodBlock()); 2026 } 2027 // jmethodID is a pointer to Method* 2028 return (jmethodID)cld->jmethod_ids()->add_method(m); 2029 } 2030 } 2031 2032 // Mark a jmethodID as free. This is called when there is a data race in 2033 // InstanceKlass while creating the jmethodID cache. 2034 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 2035 ClassLoaderData* cld = loader_data; 2036 Method** ptr = (Method**)m; 2037 assert(cld->jmethod_ids() != NULL, "should have method handles"); 2038 cld->jmethod_ids()->destroy_method(ptr); 2039 } 2040 2041 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2042 // Can't assert the method_holder is the same because the new method has the 2043 // scratch method holder. 2044 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2045 == new_method->method_holder()->class_loader(), 2046 "changing to a different class loader"); 2047 // Just change the method in place, jmethodID pointer doesn't change. 2048 *((Method**)jmid) = new_method; 2049 } 2050 2051 bool Method::is_method_id(jmethodID mid) { 2052 Method* m = resolve_jmethod_id(mid); 2053 assert(m != NULL, "should be called with non-null method"); 2054 InstanceKlass* ik = m->method_holder(); 2055 ClassLoaderData* cld = ik->class_loader_data(); 2056 if (cld->jmethod_ids() == NULL) return false; 2057 return (cld->jmethod_ids()->contains((Method**)mid)); 2058 } 2059 2060 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2061 if (mid == NULL) return NULL; 2062 Method* o = resolve_jmethod_id(mid); 2063 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 2064 return NULL; 2065 } 2066 return o; 2067 }; 2068 2069 void Method::set_on_stack(const bool value) { 2070 // Set both the method itself and its constant pool. The constant pool 2071 // on stack means some method referring to it is also on the stack. 2072 constants()->set_on_stack(value); 2073 2074 bool already_set = on_stack(); 2075 _access_flags.set_on_stack(value); 2076 if (value && !already_set) { 2077 MetadataOnStackMark::record(this); 2078 } 2079 } 2080 2081 // Called when the class loader is unloaded to make all methods weak. 2082 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2083 loader_data->jmethod_ids()->clear_all_methods(); 2084 } 2085 2086 bool Method::has_method_vptr(const void* ptr) { 2087 Method m; 2088 // This assumes that the vtbl pointer is the first word of a C++ object. 2089 // This assumption is also in universe.cpp patch_klass_vtble 2090 return dereference_vptr(&m) == dereference_vptr(ptr); 2091 } 2092 2093 // Check that this pointer is valid by checking that the vtbl pointer matches 2094 bool Method::is_valid_method() const { 2095 if (this == NULL) { 2096 return false; 2097 } else if ((intptr_t(this) & (wordSize-1)) != 0) { 2098 // Quick sanity check on pointer. 2099 return false; 2100 } else if (!is_metaspace_object()) { 2101 return false; 2102 } else { 2103 return has_method_vptr((const void*)this); 2104 } 2105 } 2106 2107 #ifndef PRODUCT 2108 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 2109 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 2110 } 2111 #endif // PRODUCT 2112 2113 2114 // Printing 2115 2116 #ifndef PRODUCT 2117 2118 void Method::print_on(outputStream* st) const { 2119 ResourceMark rm; 2120 assert(is_method(), "must be method"); 2121 st->print_cr("%s", internal_name()); 2122 // get the effect of PrintOopAddress, always, for methods: 2123 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this)); 2124 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2125 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants())); 2126 constants()->print_value_on(st); st->cr(); 2127 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2128 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2129 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2130 st->print_cr(" - max stack: %d", max_stack()); 2131 st->print_cr(" - max locals: %d", max_locals()); 2132 st->print_cr(" - size of params: %d", size_of_parameters()); 2133 st->print_cr(" - method size: %d", method_size()); 2134 if (intrinsic_id() != vmIntrinsics::_none) 2135 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 2136 if (highest_comp_level() != CompLevel_none) 2137 st->print_cr(" - highest level: %d", highest_comp_level()); 2138 st->print_cr(" - vtable index: %d", _vtable_index); 2139 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry())); 2140 st->print( " - adapters: "); 2141 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2142 if (a == NULL) 2143 st->print_cr(INTPTR_FORMAT, p2i(a)); 2144 else 2145 a->print_adapter_on(st); 2146 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry())); 2147 st->print_cr(" - code size: %d", code_size()); 2148 if (code_size() != 0) { 2149 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base())); 2150 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size())); 2151 } 2152 if (method_data() != NULL) { 2153 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data())); 2154 } 2155 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2156 if (checked_exceptions_length() > 0) { 2157 CheckedExceptionElement* table = checked_exceptions_start(); 2158 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table)); 2159 if (Verbose) { 2160 for (int i = 0; i < checked_exceptions_length(); i++) { 2161 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2162 } 2163 } 2164 } 2165 if (has_linenumber_table()) { 2166 u_char* table = compressed_linenumber_table(); 2167 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table)); 2168 if (Verbose) { 2169 CompressedLineNumberReadStream stream(table); 2170 while (stream.read_pair()) { 2171 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2172 } 2173 } 2174 } 2175 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2176 if (localvariable_table_length() > 0) { 2177 LocalVariableTableElement* table = localvariable_table_start(); 2178 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table)); 2179 if (Verbose) { 2180 for (int i = 0; i < localvariable_table_length(); i++) { 2181 int bci = table[i].start_bci; 2182 int len = table[i].length; 2183 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2184 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2185 int slot = table[i].slot; 2186 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2187 } 2188 } 2189 } 2190 if (code() != NULL) { 2191 st->print (" - compiled code: "); 2192 code()->print_value_on(st); 2193 } 2194 if (is_native()) { 2195 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function())); 2196 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler())); 2197 } 2198 } 2199 2200 void Method::print_linkage_flags(outputStream* st) { 2201 access_flags().print_on(st); 2202 if (is_default_method()) { 2203 st->print("default "); 2204 } 2205 if (is_overpass()) { 2206 st->print("overpass "); 2207 } 2208 } 2209 #endif //PRODUCT 2210 2211 void Method::print_value_on(outputStream* st) const { 2212 assert(is_method(), "must be method"); 2213 st->print("%s", internal_name()); 2214 print_address_on(st); 2215 st->print(" "); 2216 name()->print_value_on(st); 2217 st->print(" "); 2218 signature()->print_value_on(st); 2219 st->print(" in "); 2220 method_holder()->print_value_on(st); 2221 if (WizardMode) st->print("#%d", _vtable_index); 2222 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2223 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2224 } 2225 2226 #if INCLUDE_SERVICES 2227 // Size Statistics 2228 void Method::collect_statistics(KlassSizeStats *sz) const { 2229 int mysize = sz->count(this); 2230 sz->_method_bytes += mysize; 2231 sz->_method_all_bytes += mysize; 2232 sz->_rw_bytes += mysize; 2233 2234 if (constMethod()) { 2235 constMethod()->collect_statistics(sz); 2236 } 2237 if (method_data()) { 2238 method_data()->collect_statistics(sz); 2239 } 2240 } 2241 #endif // INCLUDE_SERVICES 2242 2243 // LogTouchedMethods and PrintTouchedMethods 2244 2245 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because 2246 // the Method may be garbage collected. Let's roll our own hash table. 2247 class TouchedMethodRecord : CHeapObj<mtTracing> { 2248 public: 2249 // It's OK to store Symbols here because they will NOT be GC'ed if 2250 // LogTouchedMethods is enabled. 2251 TouchedMethodRecord* _next; 2252 Symbol* _class_name; 2253 Symbol* _method_name; 2254 Symbol* _method_signature; 2255 }; 2256 2257 static const int TOUCHED_METHOD_TABLE_SIZE = 20011; 2258 static TouchedMethodRecord** _touched_method_table = NULL; 2259 2260 void Method::log_touched(TRAPS) { 2261 2262 const int table_size = TOUCHED_METHOD_TABLE_SIZE; 2263 Symbol* my_class = klass_name(); 2264 Symbol* my_name = name(); 2265 Symbol* my_sig = signature(); 2266 2267 unsigned int hash = my_class->identity_hash() + 2268 my_name->identity_hash() + 2269 my_sig->identity_hash(); 2270 juint index = juint(hash) % table_size; 2271 2272 MutexLocker ml(TouchedMethodLog_lock, THREAD); 2273 if (_touched_method_table == NULL) { 2274 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size, 2275 mtTracing, CURRENT_PC); 2276 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size); 2277 } 2278 2279 TouchedMethodRecord* ptr = _touched_method_table[index]; 2280 while (ptr) { 2281 if (ptr->_class_name == my_class && 2282 ptr->_method_name == my_name && 2283 ptr->_method_signature == my_sig) { 2284 return; 2285 } 2286 if (ptr->_next == NULL) break; 2287 ptr = ptr->_next; 2288 } 2289 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing); 2290 my_class->set_permanent(); // prevent reclaimed by GC 2291 my_name->set_permanent(); 2292 my_sig->set_permanent(); 2293 nptr->_class_name = my_class; 2294 nptr->_method_name = my_name; 2295 nptr->_method_signature = my_sig; 2296 nptr->_next = NULL; 2297 2298 if (ptr == NULL) { 2299 // first 2300 _touched_method_table[index] = nptr; 2301 } else { 2302 ptr->_next = nptr; 2303 } 2304 } 2305 2306 void Method::print_touched_methods(outputStream* out) { 2307 MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock); 2308 out->print_cr("# Method::print_touched_methods version 1"); 2309 if (_touched_method_table) { 2310 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) { 2311 TouchedMethodRecord* ptr = _touched_method_table[i]; 2312 while(ptr) { 2313 ptr->_class_name->print_symbol_on(out); out->print("."); 2314 ptr->_method_name->print_symbol_on(out); out->print(":"); 2315 ptr->_method_signature->print_symbol_on(out); out->cr(); 2316 ptr = ptr->_next; 2317 } 2318 } 2319 } 2320 } 2321 2322 // Verification 2323 2324 void Method::verify_on(outputStream* st) { 2325 guarantee(is_method(), "object must be method"); 2326 guarantee(constants()->is_constantPool(), "should be constant pool"); 2327 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 2328 MethodData* md = method_data(); 2329 guarantee(md == NULL || 2330 md->is_methodData(), "should be method data"); 2331 }