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