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