1 /* 2 * Copyright (c) 1997, 2019, 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/classLoaderDataGraph.hpp" 27 #include "classfile/metadataOnStackMark.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "code/codeCache.hpp" 30 #include "code/debugInfoRec.hpp" 31 #include "gc/shared/collectedHeap.inline.hpp" 32 #include "interpreter/bytecodeStream.hpp" 33 #include "interpreter/bytecodeTracer.hpp" 34 #include "interpreter/bytecodes.hpp" 35 #include "interpreter/interpreter.hpp" 36 #include "interpreter/oopMapCache.hpp" 37 #include "memory/allocation.inline.hpp" 38 #include "memory/heapInspection.hpp" 39 #include "memory/metadataFactory.hpp" 40 #include "memory/metaspaceClosure.hpp" 41 #include "memory/metaspaceShared.hpp" 42 #include "memory/oopFactory.hpp" 43 #include "memory/resourceArea.hpp" 44 #include "oops/constMethod.hpp" 45 #include "oops/constantPool.hpp" 46 #include "oops/method.inline.hpp" 47 #include "oops/methodData.hpp" 48 #include "oops/objArrayOop.inline.hpp" 49 #include "oops/oop.inline.hpp" 50 #include "oops/symbol.hpp" 51 #include "prims/jvmtiExport.hpp" 52 #include "prims/methodHandles.hpp" 53 #include "prims/nativeLookup.hpp" 54 #include "runtime/arguments.hpp" 55 #include "runtime/compilationPolicy.hpp" 56 #include "runtime/frame.inline.hpp" 57 #include "runtime/handles.inline.hpp" 58 #include "runtime/init.hpp" 59 #include "runtime/orderAccess.hpp" 60 #include "runtime/relocator.hpp" 61 #include "runtime/safepointVerifiers.hpp" 62 #include "runtime/sharedRuntime.hpp" 63 #include "runtime/signature.hpp" 64 #include "utilities/align.hpp" 65 #include "utilities/quickSort.hpp" 66 #include "utilities/vmError.hpp" 67 #include "utilities/xmlstream.hpp" 68 69 // Implementation of Method 70 71 Method* Method::allocate(ClassLoaderData* loader_data, 72 int byte_code_size, 73 AccessFlags access_flags, 74 InlineTableSizes* sizes, 75 ConstMethod::MethodType method_type, 76 TRAPS) { 77 assert(!access_flags.is_native() || byte_code_size == 0, 78 "native methods should not contain byte codes"); 79 ConstMethod* cm = ConstMethod::allocate(loader_data, 80 byte_code_size, 81 sizes, 82 method_type, 83 CHECK_NULL); 84 int size = Method::size(access_flags.is_native()); 85 return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags); 86 } 87 88 Method::Method(ConstMethod* xconst, AccessFlags access_flags) { 89 NoSafepointVerifier no_safepoint; 90 set_constMethod(xconst); 91 set_access_flags(access_flags); 92 set_intrinsic_id(vmIntrinsics::_none); 93 set_force_inline(false); 94 set_hidden(false); 95 set_dont_inline(false); 96 set_has_injected_profile(false); 97 set_method_data(NULL); 98 clear_method_counters(); 99 set_vtable_index(Method::garbage_vtable_index); 100 101 // Fix and bury in Method* 102 set_interpreter_entry(NULL); // sets i2i entry and from_int 103 set_adapter_entry(NULL); 104 Method::clear_code(); // from_c/from_i get set to c2i/i2i 105 106 if (access_flags.is_native()) { 107 clear_native_function(); 108 set_signature_handler(NULL); 109 } 110 111 NOT_PRODUCT(set_compiled_invocation_count(0);) 112 } 113 114 // Release Method*. The nmethod will be gone when we get here because 115 // we've walked the code cache. 116 void Method::deallocate_contents(ClassLoaderData* loader_data) { 117 MetadataFactory::free_metadata(loader_data, constMethod()); 118 set_constMethod(NULL); 119 #if INCLUDE_JVMCI 120 if (method_data()) { 121 FailedSpeculation::free_failed_speculations(method_data()->get_failed_speculations_address()); 122 } 123 #endif 124 MetadataFactory::free_metadata(loader_data, method_data()); 125 set_method_data(NULL); 126 MetadataFactory::free_metadata(loader_data, method_counters()); 127 clear_method_counters(); 128 // The nmethod will be gone when we get here. 129 if (code() != NULL) _code = NULL; 130 } 131 132 address Method::get_i2c_entry() { 133 assert(adapter() != NULL, "must have"); 134 return adapter()->get_i2c_entry(); 135 } 136 137 address Method::get_c2i_entry() { 138 assert(adapter() != NULL, "must have"); 139 return adapter()->get_c2i_entry(); 140 } 141 142 address Method::get_c2i_unverified_entry() { 143 assert(adapter() != NULL, "must have"); 144 return adapter()->get_c2i_unverified_entry(); 145 } 146 147 char* Method::name_and_sig_as_C_string() const { 148 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 149 } 150 151 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 152 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 153 } 154 155 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 156 const char* klass_name = klass->external_name(); 157 int klass_name_len = (int)strlen(klass_name); 158 int method_name_len = method_name->utf8_length(); 159 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 160 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 161 strcpy(dest, klass_name); 162 dest[klass_name_len] = '.'; 163 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 164 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 165 dest[len] = 0; 166 return dest; 167 } 168 169 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 170 Symbol* klass_name = klass->name(); 171 klass_name->as_klass_external_name(buf, size); 172 int len = (int)strlen(buf); 173 174 if (len < size - 1) { 175 buf[len++] = '.'; 176 177 method_name->as_C_string(&(buf[len]), size - len); 178 len = (int)strlen(buf); 179 180 signature->as_C_string(&(buf[len]), size - len); 181 } 182 183 return buf; 184 } 185 186 const char* Method::external_name() const { 187 return external_name(constants()->pool_holder(), name(), signature()); 188 } 189 190 void Method::print_external_name(outputStream *os) const { 191 print_external_name(os, constants()->pool_holder(), name(), signature()); 192 } 193 194 const char* Method::external_name(Klass* klass, Symbol* method_name, Symbol* signature) { 195 stringStream ss; 196 print_external_name(&ss, klass, method_name, signature); 197 return ss.as_string(); 198 } 199 200 void Method::print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature) { 201 signature->print_as_signature_external_return_type(os); 202 os->print(" %s.%s(", klass->external_name(), method_name->as_C_string()); 203 signature->print_as_signature_external_parameters(os); 204 os->print(")"); 205 } 206 207 int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS) { 208 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 209 // access exception table 210 ExceptionTable table(mh()); 211 int length = table.length(); 212 // iterate through all entries sequentially 213 constantPoolHandle pool(THREAD, mh->constants()); 214 for (int i = 0; i < length; i ++) { 215 //reacquire the table in case a GC happened 216 ExceptionTable table(mh()); 217 int beg_bci = table.start_pc(i); 218 int end_bci = table.end_pc(i); 219 assert(beg_bci <= end_bci, "inconsistent exception table"); 220 if (beg_bci <= throw_bci && throw_bci < end_bci) { 221 // exception handler bci range covers throw_bci => investigate further 222 int handler_bci = table.handler_pc(i); 223 int klass_index = table.catch_type_index(i); 224 if (klass_index == 0) { 225 return handler_bci; 226 } else if (ex_klass == NULL) { 227 return handler_bci; 228 } else { 229 // we know the exception class => get the constraint class 230 // this may require loading of the constraint class; if verification 231 // fails or some other exception occurs, return handler_bci 232 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); 233 assert(k != NULL, "klass not loaded"); 234 if (ex_klass->is_subtype_of(k)) { 235 return handler_bci; 236 } 237 } 238 } 239 } 240 241 return -1; 242 } 243 244 void Method::mask_for(int bci, InterpreterOopMap* mask) { 245 methodHandle h_this(Thread::current(), this); 246 // Only GC uses the OopMapCache during thread stack root scanning 247 // any other uses generate an oopmap but do not save it in the cache. 248 if (Universe::heap()->is_gc_active()) { 249 method_holder()->mask_for(h_this, bci, mask); 250 } else { 251 OopMapCache::compute_one_oop_map(h_this, bci, mask); 252 } 253 return; 254 } 255 256 257 int Method::bci_from(address bcp) const { 258 if (is_native() && bcp == 0) { 259 return 0; 260 } 261 #ifdef ASSERT 262 { 263 ResourceMark rm; 264 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(), 265 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", 266 p2i(bcp), name_and_sig_as_C_string()); 267 } 268 #endif 269 return bcp - code_base(); 270 } 271 272 273 int Method::validate_bci(int bci) const { 274 return (bci == 0 || bci < code_size()) ? bci : -1; 275 } 276 277 // Return bci if it appears to be a valid bcp 278 // Return -1 otherwise. 279 // Used by profiling code, when invalid data is a possibility. 280 // The caller is responsible for validating the Method* itself. 281 int Method::validate_bci_from_bcp(address bcp) const { 282 // keep bci as -1 if not a valid bci 283 int bci = -1; 284 if (bcp == 0 || bcp == code_base()) { 285 // code_size() may return 0 and we allow 0 here 286 // the method may be native 287 bci = 0; 288 } else if (contains(bcp)) { 289 bci = bcp - code_base(); 290 } 291 // Assert that if we have dodged any asserts, bci is negative. 292 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 293 return bci; 294 } 295 296 address Method::bcp_from(int bci) const { 297 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), 298 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native"); 299 address bcp = code_base() + bci; 300 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 301 return bcp; 302 } 303 304 address Method::bcp_from(address bcp) const { 305 if (is_native() && bcp == NULL) { 306 return code_base(); 307 } else { 308 return bcp; 309 } 310 } 311 312 int Method::size(bool is_native) { 313 // If native, then include pointers for native_function and signature_handler 314 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 315 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord; 316 return align_metadata_size(header_size() + extra_words); 317 } 318 319 320 Symbol* Method::klass_name() const { 321 return method_holder()->name(); 322 } 323 324 325 void Method::metaspace_pointers_do(MetaspaceClosure* it) { 326 log_trace(cds)("Iter(Method): %p", this); 327 328 it->push(&_constMethod); 329 it->push(&_method_data); 330 it->push(&_method_counters); 331 } 332 333 // Attempt to return method oop to original state. Clear any pointers 334 // (to objects outside the shared spaces). We won't be able to predict 335 // where they should point in a new JVM. Further initialize some 336 // entries now in order allow them to be write protected later. 337 338 void Method::remove_unshareable_info() { 339 unlink_method(); 340 } 341 342 void Method::set_vtable_index(int index) { 343 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 344 // At runtime initialize_vtable is rerun as part of link_class_impl() 345 // for a shared class loaded by the non-boot loader to obtain the loader 346 // constraints based on the runtime classloaders' context. 347 return; // don't write into the shared class 348 } else { 349 _vtable_index = index; 350 } 351 } 352 353 void Method::set_itable_index(int index) { 354 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 355 // At runtime initialize_itable is rerun as part of link_class_impl() 356 // for a shared class loaded by the non-boot loader to obtain the loader 357 // constraints based on the runtime classloaders' context. The dumptime 358 // itable index should be the same as the runtime index. 359 assert(_vtable_index == itable_index_max - index, 360 "archived itable index is different from runtime index"); 361 return; // don’t write into the shared class 362 } else { 363 _vtable_index = itable_index_max - index; 364 } 365 assert(valid_itable_index(), ""); 366 } 367 368 369 370 bool Method::was_executed_more_than(int n) { 371 // Invocation counter is reset when the Method* is compiled. 372 // If the method has compiled code we therefore assume it has 373 // be excuted more than n times. 374 if (is_accessor() || is_empty_method() || (code() != NULL)) { 375 // interpreter doesn't bump invocation counter of trivial methods 376 // compiler does not bump invocation counter of compiled methods 377 return true; 378 } 379 else if ((method_counters() != NULL && 380 method_counters()->invocation_counter()->carry()) || 381 (method_data() != NULL && 382 method_data()->invocation_counter()->carry())) { 383 // The carry bit is set when the counter overflows and causes 384 // a compilation to occur. We don't know how many times 385 // the counter has been reset, so we simply assume it has 386 // been executed more than n times. 387 return true; 388 } else { 389 return invocation_count() > n; 390 } 391 } 392 393 void Method::print_invocation_count() { 394 if (is_static()) tty->print("static "); 395 if (is_final()) tty->print("final "); 396 if (is_synchronized()) tty->print("synchronized "); 397 if (is_native()) tty->print("native "); 398 tty->print("%s::", method_holder()->external_name()); 399 name()->print_symbol_on(tty); 400 signature()->print_symbol_on(tty); 401 402 if (WizardMode) { 403 // dump the size of the byte codes 404 tty->print(" {%d}", code_size()); 405 } 406 tty->cr(); 407 408 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 409 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 410 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 411 #ifndef PRODUCT 412 if (CountCompiledCalls) { 413 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 414 } 415 #endif 416 } 417 418 // Build a MethodData* object to hold information about this method 419 // collected in the interpreter. 420 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) { 421 // Do not profile the method if metaspace has hit an OOM previously 422 // allocating profiling data. Callers clear pending exception so don't 423 // add one here. 424 if (ClassLoaderDataGraph::has_metaspace_oom()) { 425 return; 426 } 427 428 // Grab a lock here to prevent multiple 429 // MethodData*s from being created. 430 MutexLocker ml(MethodData_lock, THREAD); 431 if (method->method_data() == NULL) { 432 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 433 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 434 if (HAS_PENDING_EXCEPTION) { 435 CompileBroker::log_metaspace_failure(); 436 ClassLoaderDataGraph::set_metaspace_oom(true); 437 return; // return the exception (which is cleared) 438 } 439 440 method->set_method_data(method_data); 441 if (PrintMethodData && (Verbose || WizardMode)) { 442 ResourceMark rm(THREAD); 443 tty->print("build_interpreter_method_data for "); 444 method->print_name(tty); 445 tty->cr(); 446 // At the end of the run, the MDO, full of data, will be dumped. 447 } 448 } 449 } 450 451 MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 452 // Do not profile the method if metaspace has hit an OOM previously 453 if (ClassLoaderDataGraph::has_metaspace_oom()) { 454 return NULL; 455 } 456 457 methodHandle mh(m); 458 MethodCounters* counters = MethodCounters::allocate(mh, THREAD); 459 if (HAS_PENDING_EXCEPTION) { 460 CompileBroker::log_metaspace_failure(); 461 ClassLoaderDataGraph::set_metaspace_oom(true); 462 return NULL; // return the exception (which is cleared) 463 } 464 if (!mh->init_method_counters(counters)) { 465 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 466 } 467 468 if (LogTouchedMethods) { 469 mh->log_touched(CHECK_NULL); 470 } 471 472 return mh->method_counters(); 473 } 474 475 bool Method::init_method_counters(MethodCounters* counters) { 476 // Try to install a pointer to MethodCounters, return true on success. 477 return Atomic::replace_if_null(counters, &_method_counters); 478 } 479 480 int Method::extra_stack_words() { 481 // not an inline function, to avoid a header dependency on Interpreter 482 return extra_stack_entries() * Interpreter::stackElementSize; 483 } 484 485 486 void Method::compute_size_of_parameters(Thread *thread) { 487 ArgumentSizeComputer asc(signature()); 488 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 489 } 490 491 BasicType Method::result_type() const { 492 ResultTypeFinder rtf(signature()); 493 return rtf.type(); 494 } 495 496 497 bool Method::is_empty_method() const { 498 return code_size() == 1 499 && *code_base() == Bytecodes::_return; 500 } 501 502 503 bool Method::is_vanilla_constructor() const { 504 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 505 // which only calls the superclass vanilla constructor and possibly does stores of 506 // zero constants to local fields: 507 // 508 // aload_0 509 // invokespecial 510 // indexbyte1 511 // indexbyte2 512 // 513 // followed by an (optional) sequence of: 514 // 515 // aload_0 516 // aconst_null / iconst_0 / fconst_0 / dconst_0 517 // putfield 518 // indexbyte1 519 // indexbyte2 520 // 521 // followed by: 522 // 523 // return 524 525 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 526 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 527 int size = code_size(); 528 // Check if size match 529 if (size == 0 || size % 5 != 0) return false; 530 address cb = code_base(); 531 int last = size - 1; 532 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 533 // Does not call superclass default constructor 534 return false; 535 } 536 // Check optional sequence 537 for (int i = 4; i < last; i += 5) { 538 if (cb[i] != Bytecodes::_aload_0) return false; 539 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 540 if (cb[i+2] != Bytecodes::_putfield) return false; 541 } 542 return true; 543 } 544 545 546 bool Method::compute_has_loops_flag() { 547 BytecodeStream bcs(this); 548 Bytecodes::Code bc; 549 550 while ((bc = bcs.next()) >= 0) { 551 switch( bc ) { 552 case Bytecodes::_ifeq: 553 case Bytecodes::_ifnull: 554 case Bytecodes::_iflt: 555 case Bytecodes::_ifle: 556 case Bytecodes::_ifne: 557 case Bytecodes::_ifnonnull: 558 case Bytecodes::_ifgt: 559 case Bytecodes::_ifge: 560 case Bytecodes::_if_icmpeq: 561 case Bytecodes::_if_icmpne: 562 case Bytecodes::_if_icmplt: 563 case Bytecodes::_if_icmpgt: 564 case Bytecodes::_if_icmple: 565 case Bytecodes::_if_icmpge: 566 case Bytecodes::_if_acmpeq: 567 case Bytecodes::_if_acmpne: 568 case Bytecodes::_goto: 569 case Bytecodes::_jsr: 570 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 571 break; 572 573 case Bytecodes::_goto_w: 574 case Bytecodes::_jsr_w: 575 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 576 break; 577 578 default: 579 break; 580 } 581 } 582 _access_flags.set_loops_flag_init(); 583 return _access_flags.has_loops(); 584 } 585 586 bool Method::is_final_method(AccessFlags class_access_flags) const { 587 // or "does_not_require_vtable_entry" 588 // default method or overpass can occur, is not final (reuses vtable entry) 589 // private methods in classes get vtable entries for backward class compatibility. 590 if (is_overpass() || is_default_method()) return false; 591 return is_final() || class_access_flags.is_final(); 592 } 593 594 bool Method::is_final_method() const { 595 return is_final_method(method_holder()->access_flags()); 596 } 597 598 bool Method::is_default_method() const { 599 if (method_holder() != NULL && 600 method_holder()->is_interface() && 601 !is_abstract() && !is_private()) { 602 return true; 603 } else { 604 return false; 605 } 606 } 607 608 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 609 if (is_final_method(class_access_flags)) return true; 610 #ifdef ASSERT 611 ResourceMark rm; 612 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 613 if (class_access_flags.is_interface()) { 614 assert(is_nonv == is_static() || is_nonv == is_private(), 615 "nonvirtual unexpected for non-static, non-private: %s", 616 name_and_sig_as_C_string()); 617 } 618 #endif 619 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 620 return vtable_index() == nonvirtual_vtable_index; 621 } 622 623 bool Method::can_be_statically_bound() const { 624 return can_be_statically_bound(method_holder()->access_flags()); 625 } 626 627 bool Method::is_accessor() const { 628 return is_getter() || is_setter(); 629 } 630 631 bool Method::is_getter() const { 632 if (code_size() != 5) return false; 633 if (size_of_parameters() != 1) return false; 634 if (java_code_at(0) != Bytecodes::_aload_0) return false; 635 if (java_code_at(1) != Bytecodes::_getfield) return false; 636 switch (java_code_at(4)) { 637 case Bytecodes::_ireturn: 638 case Bytecodes::_lreturn: 639 case Bytecodes::_freturn: 640 case Bytecodes::_dreturn: 641 case Bytecodes::_areturn: 642 break; 643 default: 644 return false; 645 } 646 return true; 647 } 648 649 bool Method::is_setter() const { 650 if (code_size() != 6) return false; 651 if (java_code_at(0) != Bytecodes::_aload_0) return false; 652 switch (java_code_at(1)) { 653 case Bytecodes::_iload_1: 654 case Bytecodes::_aload_1: 655 case Bytecodes::_fload_1: 656 if (size_of_parameters() != 2) return false; 657 break; 658 case Bytecodes::_dload_1: 659 case Bytecodes::_lload_1: 660 if (size_of_parameters() != 3) return false; 661 break; 662 default: 663 return false; 664 } 665 if (java_code_at(2) != Bytecodes::_putfield) return false; 666 if (java_code_at(5) != Bytecodes::_return) return false; 667 return true; 668 } 669 670 bool Method::is_constant_getter() const { 671 int last_index = code_size() - 1; 672 // Check if the first 1-3 bytecodes are a constant push 673 // and the last bytecode is a return. 674 return (2 <= code_size() && code_size() <= 4 && 675 Bytecodes::is_const(java_code_at(0)) && 676 Bytecodes::length_for(java_code_at(0)) == last_index && 677 Bytecodes::is_return(java_code_at(last_index))); 678 } 679 680 bool Method::is_initializer() const { 681 return is_object_initializer() || is_static_initializer(); 682 } 683 684 bool Method::has_valid_initializer_flags() const { 685 return (is_static() || 686 method_holder()->major_version() < 51); 687 } 688 689 bool Method::is_static_initializer() const { 690 // For classfiles version 51 or greater, ensure that the clinit method is 691 // static. Non-static methods with the name "<clinit>" are not static 692 // initializers. (older classfiles exempted for backward compatibility) 693 return name() == vmSymbols::class_initializer_name() && 694 has_valid_initializer_flags(); 695 } 696 697 bool Method::is_object_initializer() const { 698 return name() == vmSymbols::object_initializer_name(); 699 } 700 701 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 702 int length = method->checked_exceptions_length(); 703 if (length == 0) { // common case 704 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 705 } else { 706 methodHandle h_this(THREAD, method); 707 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 708 objArrayHandle mirrors (THREAD, m_oop); 709 for (int i = 0; i < length; i++) { 710 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 711 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 712 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 713 mirrors->obj_at_put(i, k->java_mirror()); 714 } 715 return mirrors; 716 } 717 }; 718 719 720 int Method::line_number_from_bci(int bci) const { 721 int best_bci = 0; 722 int best_line = -1; 723 if (bci == SynchronizationEntryBCI) bci = 0; 724 if (0 <= bci && bci < code_size() && has_linenumber_table()) { 725 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 726 // Not necessarily sorted and not necessarily one-to-one. 727 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 728 while (stream.read_pair()) { 729 if (stream.bci() == bci) { 730 // perfect match 731 return stream.line(); 732 } else { 733 // update best_bci/line 734 if (stream.bci() < bci && stream.bci() >= best_bci) { 735 best_bci = stream.bci(); 736 best_line = stream.line(); 737 } 738 } 739 } 740 } 741 return best_line; 742 } 743 744 745 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 746 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 747 Thread *thread = Thread::current(); 748 Symbol* klass_name = constants()->klass_name_at(klass_index); 749 Handle loader(thread, method_holder()->class_loader()); 750 Handle prot (thread, method_holder()->protection_domain()); 751 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 752 } else { 753 return true; 754 } 755 } 756 757 758 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 759 int klass_index = constants()->klass_ref_index_at(refinfo_index); 760 if (must_be_resolved) { 761 // Make sure klass is resolved in constantpool. 762 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 763 } 764 return is_klass_loaded_by_klass_index(klass_index); 765 } 766 767 768 void Method::set_native_function(address function, bool post_event_flag) { 769 assert(function != NULL, "use clear_native_function to unregister natives"); 770 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 771 address* native_function = native_function_addr(); 772 773 // We can see racers trying to place the same native function into place. Once 774 // is plenty. 775 address current = *native_function; 776 if (current == function) return; 777 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 778 function != NULL) { 779 // native_method_throw_unsatisfied_link_error_entry() should only 780 // be passed when post_event_flag is false. 781 assert(function != 782 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 783 "post_event_flag mis-match"); 784 785 // post the bind event, and possible change the bind function 786 JvmtiExport::post_native_method_bind(this, &function); 787 } 788 *native_function = function; 789 // This function can be called more than once. We must make sure that we always 790 // use the latest registered method -> check if a stub already has been generated. 791 // If so, we have to make it not_entrant. 792 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates 793 if (nm != NULL) { 794 nm->make_not_entrant(); 795 } 796 } 797 798 799 bool Method::has_native_function() const { 800 if (is_method_handle_intrinsic()) 801 return false; // special-cased in SharedRuntime::generate_native_wrapper 802 address func = native_function(); 803 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 804 } 805 806 807 void Method::clear_native_function() { 808 // Note: is_method_handle_intrinsic() is allowed here. 809 set_native_function( 810 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 811 !native_bind_event_is_interesting); 812 Method::unlink_code(this); 813 } 814 815 address Method::critical_native_function() { 816 methodHandle mh(this); 817 return NativeLookup::lookup_critical_entry(mh); 818 } 819 820 821 void Method::set_signature_handler(address handler) { 822 address* signature_handler = signature_handler_addr(); 823 *signature_handler = handler; 824 } 825 826 827 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 828 if (PrintCompilation && report) { 829 ttyLocker ttyl; 830 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 831 if (comp_level == CompLevel_all) { 832 tty->print("all levels "); 833 } else { 834 tty->print("levels "); 835 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 836 tty->print("%d ", i); 837 } 838 } 839 this->print_short_name(tty); 840 int size = this->code_size(); 841 if (size > 0) { 842 tty->print(" (%d bytes)", size); 843 } 844 if (reason != NULL) { 845 tty->print(" %s", reason); 846 } 847 tty->cr(); 848 } 849 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 850 ttyLocker ttyl; 851 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 852 os::current_thread_id(), is_osr, comp_level); 853 if (reason != NULL) { 854 xtty->print(" reason=\'%s\'", reason); 855 } 856 xtty->method(this); 857 xtty->stamp(); 858 xtty->end_elem(); 859 } 860 } 861 862 bool Method::is_always_compilable() const { 863 // Generated adapters must be compiled 864 if (is_method_handle_intrinsic() && is_synthetic()) { 865 assert(!is_not_c1_compilable(), "sanity check"); 866 assert(!is_not_c2_compilable(), "sanity check"); 867 return true; 868 } 869 870 return false; 871 } 872 873 bool Method::is_not_compilable(int comp_level) const { 874 if (number_of_breakpoints() > 0) 875 return true; 876 if (is_always_compilable()) 877 return false; 878 if (comp_level == CompLevel_any) 879 return is_not_c1_compilable() || is_not_c2_compilable(); 880 if (is_c1_compile(comp_level)) 881 return is_not_c1_compilable(); 882 if (is_c2_compile(comp_level)) 883 return is_not_c2_compilable(); 884 return false; 885 } 886 887 // call this when compiler finds that this method is not compilable 888 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 889 if (is_always_compilable()) { 890 // Don't mark a method which should be always compilable 891 return; 892 } 893 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 894 if (comp_level == CompLevel_all) { 895 set_not_c1_compilable(); 896 set_not_c2_compilable(); 897 } else { 898 if (is_c1_compile(comp_level)) 899 set_not_c1_compilable(); 900 if (is_c2_compile(comp_level)) 901 set_not_c2_compilable(); 902 } 903 CompilationPolicy::policy()->disable_compilation(this); 904 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 905 } 906 907 bool Method::is_not_osr_compilable(int comp_level) const { 908 if (is_not_compilable(comp_level)) 909 return true; 910 if (comp_level == CompLevel_any) 911 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 912 if (is_c1_compile(comp_level)) 913 return is_not_c1_osr_compilable(); 914 if (is_c2_compile(comp_level)) 915 return is_not_c2_osr_compilable(); 916 return false; 917 } 918 919 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 920 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 921 if (comp_level == CompLevel_all) { 922 set_not_c1_osr_compilable(); 923 set_not_c2_osr_compilable(); 924 } else { 925 if (is_c1_compile(comp_level)) 926 set_not_c1_osr_compilable(); 927 if (is_c2_compile(comp_level)) 928 set_not_c2_osr_compilable(); 929 } 930 CompilationPolicy::policy()->disable_compilation(this); 931 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 932 } 933 934 // Revert to using the interpreter and clear out the nmethod 935 void Method::clear_code() { 936 // this may be NULL if c2i adapters have not been made yet 937 // Only should happen at allocate time. 938 if (adapter() == NULL) { 939 _from_compiled_entry = NULL; 940 } else { 941 _from_compiled_entry = adapter()->get_c2i_entry(); 942 } 943 OrderAccess::storestore(); 944 _from_interpreted_entry = _i2i_entry; 945 OrderAccess::storestore(); 946 _code = NULL; 947 } 948 949 void Method::unlink_code(Method *method, CompiledMethod *compare) { 950 if (method == NULL) { 951 return; 952 } 953 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 954 if (method->code() == compare || 955 method->from_compiled_entry() == compare->verified_entry_point()) { 956 method->clear_code(); 957 } 958 } 959 960 void Method::unlink_code(Method *method) { 961 if (method != NULL) { 962 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 963 method->clear_code(); 964 } 965 } 966 967 #if INCLUDE_CDS 968 // Called by class data sharing to remove any entry points (which are not shared) 969 void Method::unlink_method() { 970 _code = NULL; 971 972 assert(DumpSharedSpaces, "dump time only"); 973 // Set the values to what they should be at run time. Note that 974 // this Method can no longer be executed during dump time. 975 _i2i_entry = Interpreter::entry_for_cds_method(this); 976 _from_interpreted_entry = _i2i_entry; 977 978 if (is_native()) { 979 *native_function_addr() = NULL; 980 set_signature_handler(NULL); 981 } 982 NOT_PRODUCT(set_compiled_invocation_count(0);) 983 984 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter(); 985 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline()); 986 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline(); 987 assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time"); 988 989 set_method_data(NULL); 990 clear_method_counters(); 991 } 992 #endif 993 994 /**************************************************************************** 995 // The following illustrates how the entries work for CDS shared Methods: 996 // 997 // Our goal is to delay writing into a shared Method until it's compiled. 998 // Hence, we want to determine the initial values for _i2i_entry, 999 // _from_interpreted_entry and _from_compiled_entry during CDS dump time. 1000 // 1001 // In this example, both Methods A and B have the _i2i_entry of "zero_locals". 1002 // They also have similar signatures so that they will share the same 1003 // AdapterHandlerEntry. 1004 // 1005 // _adapter_trampoline points to a fixed location in the RW section of 1006 // the CDS archive. This location initially contains a NULL pointer. When the 1007 // first of method A or B is linked, an AdapterHandlerEntry is allocated 1008 // dynamically, and its c2i/i2c entries are generated. 1009 // 1010 // _i2i_entry and _from_interpreted_entry initially points to the same 1011 // (fixed) location in the CODE section of the CDS archive. This contains 1012 // an unconditional branch to the actual entry for "zero_locals", which is 1013 // generated at run time and may be on an arbitrary address. Thus, the 1014 // unconditional branch is also generated at run time to jump to the correct 1015 // address. 1016 // 1017 // Similarly, _from_compiled_entry points to a fixed address in the CODE 1018 // section. This address has enough space for an unconditional branch 1019 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is 1020 // initialized, and the address for the actual c2i_entry is known, we emit a 1021 // branch instruction here to branch to the actual c2i_entry. 1022 // 1023 // The effect of the extra branch on the i2i and c2i entries is negligible. 1024 // 1025 // The reason for putting _adapter_trampoline in RO is many shared Methods 1026 // share the same AdapterHandlerEntry, so we can save space in the RW section 1027 // by having the extra indirection. 1028 1029 1030 [Method A: RW] 1031 _constMethod ----> [ConstMethod: RO] 1032 _adapter_trampoline -----------+ 1033 | 1034 _i2i_entry (same value as method B) | 1035 _from_interpreted_entry (same value as method B) | 1036 _from_compiled_entry (same value as method B) | 1037 | 1038 | 1039 [Method B: RW] +--------+ 1040 _constMethod ----> [ConstMethod: RO] | 1041 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+ 1042 | 1043 +-------------------------------+ 1044 | 1045 +----> [AdapterHandlerEntry] (allocated at run time) 1046 _fingerprint 1047 _c2i_entry ---------------------------------+->[c2i entry..] 1048 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] | 1049 _from_interpreted_entry | _c2i_unverified_entry | | 1050 | | | | 1051 | | (_cds_entry_table: CODE) | | 1052 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | | 1053 | | (allocated at run time) | | 1054 | | ... [asm code ...] | | 1055 +-[not compiled]-+ [n]: jmp _entry_table[n] | | 1056 | | | 1057 | | | 1058 +-[compiled]-------------------------------------------------------------------+ | 1059 | 1060 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) | 1061 [jmp c2i_entry] ------------------------------------------------------+ 1062 1063 ***/ 1064 1065 // Called when the method_holder is getting linked. Setup entrypoints so the method 1066 // is ready to be called from interpreter, compiler, and vtables. 1067 void Method::link_method(const methodHandle& h_method, TRAPS) { 1068 // If the code cache is full, we may reenter this function for the 1069 // leftover methods that weren't linked. 1070 if (is_shared()) { 1071 address entry = Interpreter::entry_for_cds_method(h_method); 1072 assert(entry != NULL && entry == _i2i_entry, 1073 "should be correctly set during dump time"); 1074 if (adapter() != NULL) { 1075 return; 1076 } 1077 assert(entry == _from_interpreted_entry, 1078 "should be correctly set during dump time"); 1079 } else if (_i2i_entry != NULL) { 1080 return; 1081 } 1082 assert( _code == NULL, "nothing compiled yet" ); 1083 1084 // Setup interpreter entrypoint 1085 assert(this == h_method(), "wrong h_method()" ); 1086 1087 if (!is_shared()) { 1088 assert(adapter() == NULL, "init'd to NULL"); 1089 address entry = Interpreter::entry_for_method(h_method); 1090 assert(entry != NULL, "interpreter entry must be non-null"); 1091 // Sets both _i2i_entry and _from_interpreted_entry 1092 set_interpreter_entry(entry); 1093 } 1094 1095 // Don't overwrite already registered native entries. 1096 if (is_native() && !has_native_function()) { 1097 set_native_function( 1098 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1099 !native_bind_event_is_interesting); 1100 } 1101 1102 // Setup compiler entrypoint. This is made eagerly, so we do not need 1103 // special handling of vtables. An alternative is to make adapters more 1104 // lazily by calling make_adapter() from from_compiled_entry() for the 1105 // normal calls. For vtable calls life gets more complicated. When a 1106 // call-site goes mega-morphic we need adapters in all methods which can be 1107 // called from the vtable. We need adapters on such methods that get loaded 1108 // later. Ditto for mega-morphic itable calls. If this proves to be a 1109 // problem we'll make these lazily later. 1110 (void) make_adapters(h_method, CHECK); 1111 1112 // ONLY USE the h_method now as make_adapter may have blocked 1113 1114 } 1115 1116 address Method::make_adapters(const methodHandle& mh, TRAPS) { 1117 // Adapters for compiled code are made eagerly here. They are fairly 1118 // small (generally < 100 bytes) and quick to make (and cached and shared) 1119 // so making them eagerly shouldn't be too expensive. 1120 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1121 if (adapter == NULL ) { 1122 if (!is_init_completed()) { 1123 // Don't throw exceptions during VM initialization because java.lang.* classes 1124 // might not have been initialized, causing problems when constructing the 1125 // Java exception object. 1126 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1127 } else { 1128 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters"); 1129 } 1130 } 1131 1132 if (mh->is_shared()) { 1133 assert(mh->adapter() == adapter, "must be"); 1134 assert(mh->_from_compiled_entry != NULL, "must be"); 1135 } else { 1136 mh->set_adapter_entry(adapter); 1137 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1138 } 1139 return adapter->get_c2i_entry(); 1140 } 1141 1142 void Method::restore_unshareable_info(TRAPS) { 1143 assert(is_method() && is_valid_method(this), "ensure C++ vtable is restored"); 1144 1145 // Since restore_unshareable_info can be called more than once for a method, don't 1146 // redo any work. 1147 if (adapter() == NULL) { 1148 methodHandle mh(THREAD, this); 1149 link_method(mh, CHECK); 1150 } 1151 } 1152 1153 address Method::from_compiled_entry_no_trampoline() const { 1154 CompiledMethod *code = OrderAccess::load_acquire(&_code); 1155 if (code) { 1156 return code->verified_entry_point(); 1157 } else { 1158 return adapter()->get_c2i_entry(); 1159 } 1160 } 1161 1162 // The verified_code_entry() must be called when a invoke is resolved 1163 // on this method. 1164 1165 // It returns the compiled code entry point, after asserting not null. 1166 // This function is called after potential safepoints so that nmethod 1167 // or adapter that it points to is still live and valid. 1168 // This function must not hit a safepoint! 1169 address Method::verified_code_entry() { 1170 debug_only(NoSafepointVerifier nsv;) 1171 assert(_from_compiled_entry != NULL, "must be set"); 1172 return _from_compiled_entry; 1173 } 1174 1175 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1176 // (could be racing a deopt). 1177 // Not inline to avoid circular ref. 1178 bool Method::check_code() const { 1179 // cached in a register or local. There's a race on the value of the field. 1180 CompiledMethod *code = OrderAccess::load_acquire(&_code); 1181 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 1182 } 1183 1184 // Install compiled code. Instantly it can execute. 1185 void Method::set_code(const methodHandle& mh, CompiledMethod *code) { 1186 MutexLocker pl(CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 1187 assert( code, "use clear_code to remove code" ); 1188 assert( mh->check_code(), "" ); 1189 1190 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 1191 1192 // These writes must happen in this order, because the interpreter will 1193 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1194 // which jumps to _from_compiled_entry. 1195 mh->_code = code; // Assign before allowing compiled code to exec 1196 1197 int comp_level = code->comp_level(); 1198 // In theory there could be a race here. In practice it is unlikely 1199 // and not worth worrying about. 1200 if (comp_level > mh->highest_comp_level()) { 1201 mh->set_highest_comp_level(comp_level); 1202 } 1203 1204 OrderAccess::storestore(); 1205 mh->_from_compiled_entry = code->verified_entry_point(); 1206 OrderAccess::storestore(); 1207 // Instantly compiled code can execute. 1208 if (!mh->is_method_handle_intrinsic()) 1209 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1210 } 1211 1212 1213 bool Method::is_overridden_in(Klass* k) const { 1214 InstanceKlass* ik = InstanceKlass::cast(k); 1215 1216 if (ik->is_interface()) return false; 1217 1218 // If method is an interface, we skip it - except if it 1219 // is a miranda method 1220 if (method_holder()->is_interface()) { 1221 // Check that method is not a miranda method 1222 if (ik->lookup_method(name(), signature()) == NULL) { 1223 // No implementation exist - so miranda method 1224 return false; 1225 } 1226 return true; 1227 } 1228 1229 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1230 if (!has_vtable_index()) { 1231 return false; 1232 } else { 1233 Method* vt_m = ik->method_at_vtable(vtable_index()); 1234 return vt_m != this; 1235 } 1236 } 1237 1238 1239 // give advice about whether this Method* should be cached or not 1240 bool Method::should_not_be_cached() const { 1241 if (is_old()) { 1242 // This method has been redefined. It is either EMCP or obsolete 1243 // and we don't want to cache it because that would pin the method 1244 // down and prevent it from being collectible if and when it 1245 // finishes executing. 1246 return true; 1247 } 1248 1249 // caching this method should be just fine 1250 return false; 1251 } 1252 1253 1254 /** 1255 * Returns true if this is one of the specially treated methods for 1256 * security related stack walks (like Reflection.getCallerClass). 1257 */ 1258 bool Method::is_ignored_by_security_stack_walk() const { 1259 if (intrinsic_id() == vmIntrinsics::_invoke) { 1260 // This is Method.invoke() -- ignore it 1261 return true; 1262 } 1263 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1264 // This is an auxilary frame -- ignore it 1265 return true; 1266 } 1267 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1268 // This is an internal adapter frame for method handles -- ignore it 1269 return true; 1270 } 1271 return false; 1272 } 1273 1274 1275 // Constant pool structure for invoke methods: 1276 enum { 1277 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1278 _imcp_invoke_signature, // utf8: (variable Symbol*) 1279 _imcp_limit 1280 }; 1281 1282 // Test if this method is an MH adapter frame generated by Java code. 1283 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1284 bool Method::is_compiled_lambda_form() const { 1285 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1286 } 1287 1288 // Test if this method is an internal MH primitive method. 1289 bool Method::is_method_handle_intrinsic() const { 1290 vmIntrinsics::ID iid = intrinsic_id(); 1291 return (MethodHandles::is_signature_polymorphic(iid) && 1292 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1293 } 1294 1295 bool Method::has_member_arg() const { 1296 vmIntrinsics::ID iid = intrinsic_id(); 1297 return (MethodHandles::is_signature_polymorphic(iid) && 1298 MethodHandles::has_member_arg(iid)); 1299 } 1300 1301 // Make an instance of a signature-polymorphic internal MH primitive. 1302 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1303 Symbol* signature, 1304 TRAPS) { 1305 ResourceMark rm; 1306 methodHandle empty; 1307 1308 InstanceKlass* holder = SystemDictionary::MethodHandle_klass(); 1309 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1310 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1311 if (TraceMethodHandles) { 1312 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1313 } 1314 1315 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1316 name->increment_refcount(); 1317 signature->increment_refcount(); 1318 1319 int cp_length = _imcp_limit; 1320 ClassLoaderData* loader_data = holder->class_loader_data(); 1321 constantPoolHandle cp; 1322 { 1323 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1324 cp = constantPoolHandle(THREAD, cp_oop); 1325 } 1326 cp->set_pool_holder(holder); 1327 cp->symbol_at_put(_imcp_invoke_name, name); 1328 cp->symbol_at_put(_imcp_invoke_signature, signature); 1329 cp->set_has_preresolution(); 1330 1331 // decide on access bits: public or not? 1332 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1333 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1334 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1335 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1336 1337 methodHandle m; 1338 { 1339 InlineTableSizes sizes; 1340 Method* m_oop = Method::allocate(loader_data, 0, 1341 accessFlags_from(flags_bits), &sizes, 1342 ConstMethod::NORMAL, CHECK_(empty)); 1343 m = methodHandle(THREAD, m_oop); 1344 } 1345 m->set_constants(cp()); 1346 m->set_name_index(_imcp_invoke_name); 1347 m->set_signature_index(_imcp_invoke_signature); 1348 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1349 assert(m->signature() == signature, ""); 1350 ResultTypeFinder rtf(signature); 1351 m->constMethod()->set_result_type(rtf.type()); 1352 m->compute_size_of_parameters(THREAD); 1353 m->init_intrinsic_id(); 1354 assert(m->is_method_handle_intrinsic(), ""); 1355 #ifdef ASSERT 1356 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1357 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1358 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1359 #endif //ASSERT 1360 1361 // Finally, set up its entry points. 1362 assert(m->can_be_statically_bound(), ""); 1363 m->set_vtable_index(Method::nonvirtual_vtable_index); 1364 m->link_method(m, CHECK_(empty)); 1365 1366 if (TraceMethodHandles && (Verbose || WizardMode)) { 1367 ttyLocker ttyl; 1368 m->print_on(tty); 1369 } 1370 1371 return m; 1372 } 1373 1374 Klass* Method::check_non_bcp_klass(Klass* klass) { 1375 if (klass != NULL && klass->class_loader() != NULL) { 1376 if (klass->is_objArray_klass()) 1377 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1378 return klass; 1379 } 1380 return NULL; 1381 } 1382 1383 1384 methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, 1385 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1386 // Code below does not work for native methods - they should never get rewritten anyway 1387 assert(!m->is_native(), "cannot rewrite native methods"); 1388 // Allocate new Method* 1389 AccessFlags flags = m->access_flags(); 1390 1391 ConstMethod* cm = m->constMethod(); 1392 int checked_exceptions_len = cm->checked_exceptions_length(); 1393 int localvariable_len = cm->localvariable_table_length(); 1394 int exception_table_len = cm->exception_table_length(); 1395 int method_parameters_len = cm->method_parameters_length(); 1396 int method_annotations_len = cm->method_annotations_length(); 1397 int parameter_annotations_len = cm->parameter_annotations_length(); 1398 int type_annotations_len = cm->type_annotations_length(); 1399 int default_annotations_len = cm->default_annotations_length(); 1400 1401 InlineTableSizes sizes( 1402 localvariable_len, 1403 new_compressed_linenumber_size, 1404 exception_table_len, 1405 checked_exceptions_len, 1406 method_parameters_len, 1407 cm->generic_signature_index(), 1408 method_annotations_len, 1409 parameter_annotations_len, 1410 type_annotations_len, 1411 default_annotations_len, 1412 0); 1413 1414 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1415 Method* newm_oop = Method::allocate(loader_data, 1416 new_code_length, 1417 flags, 1418 &sizes, 1419 m->method_type(), 1420 CHECK_(methodHandle())); 1421 methodHandle newm (THREAD, newm_oop); 1422 1423 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1424 ConstMethod* newcm = newm->constMethod(); 1425 int new_const_method_size = newm->constMethod()->size(); 1426 1427 // This works because the source and target are both Methods. Some compilers 1428 // (e.g., clang) complain that the target vtable pointer will be stomped, 1429 // so cast away newm()'s and m()'s Methodness. 1430 memcpy((void*)newm(), (void*)m(), sizeof(Method)); 1431 1432 // Create shallow copy of ConstMethod. 1433 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1434 1435 // Reset correct method/const method, method size, and parameter info 1436 newm->set_constMethod(newcm); 1437 newm->constMethod()->set_code_size(new_code_length); 1438 newm->constMethod()->set_constMethod_size(new_const_method_size); 1439 assert(newm->code_size() == new_code_length, "check"); 1440 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1441 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1442 assert(newm->exception_table_length() == exception_table_len, "check"); 1443 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1444 // Copy new byte codes 1445 memcpy(newm->code_base(), new_code, new_code_length); 1446 // Copy line number table 1447 if (new_compressed_linenumber_size > 0) { 1448 memcpy(newm->compressed_linenumber_table(), 1449 new_compressed_linenumber_table, 1450 new_compressed_linenumber_size); 1451 } 1452 // Copy method_parameters 1453 if (method_parameters_len > 0) { 1454 memcpy(newm->method_parameters_start(), 1455 m->method_parameters_start(), 1456 method_parameters_len * sizeof(MethodParametersElement)); 1457 } 1458 // Copy checked_exceptions 1459 if (checked_exceptions_len > 0) { 1460 memcpy(newm->checked_exceptions_start(), 1461 m->checked_exceptions_start(), 1462 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1463 } 1464 // Copy exception table 1465 if (exception_table_len > 0) { 1466 memcpy(newm->exception_table_start(), 1467 m->exception_table_start(), 1468 exception_table_len * sizeof(ExceptionTableElement)); 1469 } 1470 // Copy local variable number table 1471 if (localvariable_len > 0) { 1472 memcpy(newm->localvariable_table_start(), 1473 m->localvariable_table_start(), 1474 localvariable_len * sizeof(LocalVariableTableElement)); 1475 } 1476 // Copy stackmap table 1477 if (m->has_stackmap_table()) { 1478 int code_attribute_length = m->stackmap_data()->length(); 1479 Array<u1>* stackmap_data = 1480 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1481 memcpy((void*)stackmap_data->adr_at(0), 1482 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1483 newm->set_stackmap_data(stackmap_data); 1484 } 1485 1486 // copy annotations over to new method 1487 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL); 1488 return newm; 1489 } 1490 1491 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) { 1492 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1493 // because we are not loading from core libraries 1494 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1495 // which does not use the class default class loader so we check for its loader here 1496 const InstanceKlass* ik = InstanceKlass::cast(holder); 1497 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1498 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1499 } 1500 1501 // see if the klass name is well-known: 1502 Symbol* klass_name = ik->name(); 1503 return vmSymbols::find_sid(klass_name); 1504 } 1505 1506 void Method::init_intrinsic_id() { 1507 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1508 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1509 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1510 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1511 1512 // the klass name is well-known: 1513 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1514 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1515 1516 // ditto for method and signature: 1517 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1518 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1519 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1520 && name_id == vmSymbols::NO_SID) { 1521 return; 1522 } 1523 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1524 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1525 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1526 && sig_id == vmSymbols::NO_SID) { 1527 return; 1528 } 1529 jshort flags = access_flags().as_short(); 1530 1531 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1532 if (id != vmIntrinsics::_none) { 1533 set_intrinsic_id(id); 1534 if (id == vmIntrinsics::_Class_cast) { 1535 // Even if the intrinsic is rejected, we want to inline this simple method. 1536 set_force_inline(true); 1537 } 1538 return; 1539 } 1540 1541 // A few slightly irregular cases: 1542 switch (klass_id) { 1543 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1544 // Second chance: check in regular Math. 1545 switch (name_id) { 1546 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1547 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1548 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1549 // pretend it is the corresponding method in the non-strict class: 1550 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1551 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1552 break; 1553 default: 1554 break; 1555 } 1556 break; 1557 1558 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1559 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1560 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1561 if (!is_native()) break; 1562 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1563 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1564 id = vmIntrinsics::_none; 1565 break; 1566 1567 default: 1568 break; 1569 } 1570 1571 if (id != vmIntrinsics::_none) { 1572 // Set up its iid. It is an alias method. 1573 set_intrinsic_id(id); 1574 return; 1575 } 1576 } 1577 1578 // These two methods are static since a GC may move the Method 1579 bool Method::load_signature_classes(const methodHandle& m, TRAPS) { 1580 if (!THREAD->can_call_java()) { 1581 // There is nothing useful this routine can do from within the Compile thread. 1582 // Hopefully, the signature contains only well-known classes. 1583 // We could scan for this and return true/false, but the caller won't care. 1584 return false; 1585 } 1586 bool sig_is_loaded = true; 1587 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1588 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1589 ResourceMark rm(THREAD); 1590 Symbol* signature = m->signature(); 1591 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1592 if (ss.is_object()) { 1593 Symbol* sym = ss.as_symbol(CHECK_(false)); 1594 Symbol* name = sym; 1595 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1596 protection_domain, THREAD); 1597 // We are loading classes eagerly. If a ClassNotFoundException or 1598 // a LinkageError was generated, be sure to ignore it. 1599 if (HAS_PENDING_EXCEPTION) { 1600 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1601 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1602 CLEAR_PENDING_EXCEPTION; 1603 } else { 1604 return false; 1605 } 1606 } 1607 if( klass == NULL) { sig_is_loaded = false; } 1608 } 1609 } 1610 return sig_is_loaded; 1611 } 1612 1613 bool Method::has_unloaded_classes_in_signature(const methodHandle& m, TRAPS) { 1614 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1615 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1616 ResourceMark rm(THREAD); 1617 Symbol* signature = m->signature(); 1618 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1619 if (ss.type() == T_OBJECT) { 1620 Symbol* name = ss.as_symbol_or_null(); 1621 if (name == NULL) return true; 1622 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1623 if (klass == NULL) return true; 1624 } 1625 } 1626 return false; 1627 } 1628 1629 // Exposed so field engineers can debug VM 1630 void Method::print_short_name(outputStream* st) { 1631 ResourceMark rm; 1632 #ifdef PRODUCT 1633 st->print(" %s::", method_holder()->external_name()); 1634 #else 1635 st->print(" %s::", method_holder()->internal_name()); 1636 #endif 1637 name()->print_symbol_on(st); 1638 if (WizardMode) signature()->print_symbol_on(st); 1639 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1640 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1641 } 1642 1643 // Comparer for sorting an object array containing 1644 // Method*s. 1645 static int method_comparator(Method* a, Method* b) { 1646 return a->name()->fast_compare(b->name()); 1647 } 1648 1649 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1650 // default_methods also uses this without the ordering for fast find_method 1651 void Method::sort_methods(Array<Method*>* methods, bool set_idnums) { 1652 int length = methods->length(); 1653 if (length > 1) { 1654 { 1655 NoSafepointVerifier nsv; 1656 QuickSort::sort(methods->data(), length, method_comparator, /*idempotent=*/false); 1657 } 1658 // Reset method ordering 1659 if (set_idnums) { 1660 for (int i = 0; i < length; i++) { 1661 Method* m = methods->at(i); 1662 m->set_method_idnum(i); 1663 m->set_orig_method_idnum(i); 1664 } 1665 } 1666 } 1667 } 1668 1669 //----------------------------------------------------------------------------------- 1670 // Non-product code unless JVM/TI needs it 1671 1672 #if !defined(PRODUCT) || INCLUDE_JVMTI 1673 class SignatureTypePrinter : public SignatureTypeNames { 1674 private: 1675 outputStream* _st; 1676 bool _use_separator; 1677 1678 void type_name(const char* name) { 1679 if (_use_separator) _st->print(", "); 1680 _st->print("%s", name); 1681 _use_separator = true; 1682 } 1683 1684 public: 1685 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1686 _st = st; 1687 _use_separator = false; 1688 } 1689 1690 void print_parameters() { _use_separator = false; iterate_parameters(); } 1691 void print_returntype() { _use_separator = false; iterate_returntype(); } 1692 }; 1693 1694 1695 void Method::print_name(outputStream* st) { 1696 Thread *thread = Thread::current(); 1697 ResourceMark rm(thread); 1698 st->print("%s ", is_static() ? "static" : "virtual"); 1699 if (WizardMode) { 1700 st->print("%s.", method_holder()->internal_name()); 1701 name()->print_symbol_on(st); 1702 signature()->print_symbol_on(st); 1703 } else { 1704 SignatureTypePrinter sig(signature(), st); 1705 sig.print_returntype(); 1706 st->print(" %s.", method_holder()->internal_name()); 1707 name()->print_symbol_on(st); 1708 st->print("("); 1709 sig.print_parameters(); 1710 st->print(")"); 1711 } 1712 } 1713 #endif // !PRODUCT || INCLUDE_JVMTI 1714 1715 1716 void Method::print_codes_on(outputStream* st) const { 1717 print_codes_on(0, code_size(), st); 1718 } 1719 1720 void Method::print_codes_on(int from, int to, outputStream* st) const { 1721 Thread *thread = Thread::current(); 1722 ResourceMark rm(thread); 1723 methodHandle mh (thread, (Method*)this); 1724 BytecodeStream s(mh); 1725 s.set_interval(from, to); 1726 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1727 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1728 } 1729 1730 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1731 _bci = 0; 1732 _line = 0; 1733 }; 1734 1735 bool CompressedLineNumberReadStream::read_pair() { 1736 jubyte next = read_byte(); 1737 // Check for terminator 1738 if (next == 0) return false; 1739 if (next == 0xFF) { 1740 // Escape character, regular compression used 1741 _bci += read_signed_int(); 1742 _line += read_signed_int(); 1743 } else { 1744 // Single byte compression used 1745 _bci += next >> 3; 1746 _line += next & 0x7; 1747 } 1748 return true; 1749 } 1750 1751 #if INCLUDE_JVMTI 1752 1753 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1754 BreakpointInfo* bp = method_holder()->breakpoints(); 1755 for (; bp != NULL; bp = bp->next()) { 1756 if (bp->match(this, bci)) { 1757 return bp->orig_bytecode(); 1758 } 1759 } 1760 { 1761 ResourceMark rm; 1762 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1763 } 1764 return Bytecodes::_shouldnotreachhere; 1765 } 1766 1767 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1768 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1769 BreakpointInfo* bp = method_holder()->breakpoints(); 1770 for (; bp != NULL; bp = bp->next()) { 1771 if (bp->match(this, bci)) { 1772 bp->set_orig_bytecode(code); 1773 // and continue, in case there is more than one 1774 } 1775 } 1776 } 1777 1778 void Method::set_breakpoint(int bci) { 1779 InstanceKlass* ik = method_holder(); 1780 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1781 bp->set_next(ik->breakpoints()); 1782 ik->set_breakpoints(bp); 1783 // do this last: 1784 bp->set(this); 1785 } 1786 1787 static void clear_matches(Method* m, int bci) { 1788 InstanceKlass* ik = m->method_holder(); 1789 BreakpointInfo* prev_bp = NULL; 1790 BreakpointInfo* next_bp; 1791 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1792 next_bp = bp->next(); 1793 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1794 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1795 // do this first: 1796 bp->clear(m); 1797 // unhook it 1798 if (prev_bp != NULL) 1799 prev_bp->set_next(next_bp); 1800 else 1801 ik->set_breakpoints(next_bp); 1802 delete bp; 1803 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1804 // at same location. So we have multiple matching (method_index and bci) 1805 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1806 // breakpoint for clear_breakpoint request and keep all other method versions 1807 // BreakpointInfo for future clear_breakpoint request. 1808 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1809 // which is being called when class is unloaded. We delete all the Breakpoint 1810 // information for all versions of method. We may not correctly restore the original 1811 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1812 // so these methods won't be used anymore. 1813 if (bci >= 0) { 1814 break; 1815 } 1816 } else { 1817 // This one is a keeper. 1818 prev_bp = bp; 1819 } 1820 } 1821 } 1822 1823 void Method::clear_breakpoint(int bci) { 1824 assert(bci >= 0, ""); 1825 clear_matches(this, bci); 1826 } 1827 1828 void Method::clear_all_breakpoints() { 1829 clear_matches(this, -1); 1830 } 1831 1832 #endif // INCLUDE_JVMTI 1833 1834 int Method::invocation_count() { 1835 MethodCounters *mcs = method_counters(); 1836 if (TieredCompilation) { 1837 MethodData* const mdo = method_data(); 1838 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1839 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1840 return InvocationCounter::count_limit; 1841 } else { 1842 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1843 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1844 } 1845 } else { 1846 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1847 } 1848 } 1849 1850 int Method::backedge_count() { 1851 MethodCounters *mcs = method_counters(); 1852 if (TieredCompilation) { 1853 MethodData* const mdo = method_data(); 1854 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1855 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1856 return InvocationCounter::count_limit; 1857 } else { 1858 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1859 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1860 } 1861 } else { 1862 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1863 } 1864 } 1865 1866 int Method::highest_comp_level() const { 1867 const MethodCounters* mcs = method_counters(); 1868 if (mcs != NULL) { 1869 return mcs->highest_comp_level(); 1870 } else { 1871 return CompLevel_none; 1872 } 1873 } 1874 1875 int Method::highest_osr_comp_level() const { 1876 const MethodCounters* mcs = method_counters(); 1877 if (mcs != NULL) { 1878 return mcs->highest_osr_comp_level(); 1879 } else { 1880 return CompLevel_none; 1881 } 1882 } 1883 1884 void Method::set_highest_comp_level(int level) { 1885 MethodCounters* mcs = method_counters(); 1886 if (mcs != NULL) { 1887 mcs->set_highest_comp_level(level); 1888 } 1889 } 1890 1891 void Method::set_highest_osr_comp_level(int level) { 1892 MethodCounters* mcs = method_counters(); 1893 if (mcs != NULL) { 1894 mcs->set_highest_osr_comp_level(level); 1895 } 1896 } 1897 1898 #if INCLUDE_JVMTI 1899 1900 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1901 _bci = bci; 1902 _name_index = m->name_index(); 1903 _signature_index = m->signature_index(); 1904 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1905 if (_orig_bytecode == Bytecodes::_breakpoint) 1906 _orig_bytecode = m->orig_bytecode_at(_bci); 1907 _next = NULL; 1908 } 1909 1910 void BreakpointInfo::set(Method* method) { 1911 #ifdef ASSERT 1912 { 1913 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1914 if (code == Bytecodes::_breakpoint) 1915 code = method->orig_bytecode_at(_bci); 1916 assert(orig_bytecode() == code, "original bytecode must be the same"); 1917 } 1918 #endif 1919 Thread *thread = Thread::current(); 1920 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1921 method->incr_number_of_breakpoints(thread); 1922 SystemDictionary::notice_modification(); 1923 { 1924 // Deoptimize all dependents on this method 1925 HandleMark hm(thread); 1926 methodHandle mh(thread, method); 1927 CodeCache::flush_dependents_on_method(mh); 1928 } 1929 } 1930 1931 void BreakpointInfo::clear(Method* method) { 1932 *method->bcp_from(_bci) = orig_bytecode(); 1933 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1934 method->decr_number_of_breakpoints(Thread::current()); 1935 } 1936 1937 #endif // INCLUDE_JVMTI 1938 1939 // jmethodID handling 1940 1941 // This is a block allocating object, sort of like JNIHandleBlock, only a 1942 // lot simpler. 1943 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1944 // never get rid of it. 1945 1946 static const int min_block_size = 8; 1947 1948 class JNIMethodBlockNode : public CHeapObj<mtClass> { 1949 friend class JNIMethodBlock; 1950 Method** _methods; 1951 int _number_of_methods; 1952 int _top; 1953 JNIMethodBlockNode* _next; 1954 1955 public: 1956 1957 JNIMethodBlockNode(int num_methods = min_block_size); 1958 1959 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 1960 1961 void ensure_methods(int num_addl_methods) { 1962 if (_top < _number_of_methods) { 1963 num_addl_methods -= _number_of_methods - _top; 1964 if (num_addl_methods <= 0) { 1965 return; 1966 } 1967 } 1968 if (_next == NULL) { 1969 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 1970 } else { 1971 _next->ensure_methods(num_addl_methods); 1972 } 1973 } 1974 }; 1975 1976 class JNIMethodBlock : public CHeapObj<mtClass> { 1977 JNIMethodBlockNode _head; 1978 JNIMethodBlockNode *_last_free; 1979 public: 1980 static Method* const _free_method; 1981 1982 JNIMethodBlock(int initial_capacity = min_block_size) 1983 : _head(initial_capacity), _last_free(&_head) {} 1984 1985 void ensure_methods(int num_addl_methods) { 1986 _last_free->ensure_methods(num_addl_methods); 1987 } 1988 1989 Method** add_method(Method* m) { 1990 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) { 1991 if (b->_top < b->_number_of_methods) { 1992 // top points to the next free entry. 1993 int i = b->_top; 1994 b->_methods[i] = m; 1995 b->_top++; 1996 _last_free = b; 1997 return &(b->_methods[i]); 1998 } else if (b->_top == b->_number_of_methods) { 1999 // if the next free entry ran off the block see if there's a free entry 2000 for (int i = 0; i < b->_number_of_methods; i++) { 2001 if (b->_methods[i] == _free_method) { 2002 b->_methods[i] = m; 2003 _last_free = b; 2004 return &(b->_methods[i]); 2005 } 2006 } 2007 // Only check each block once for frees. They're very unlikely. 2008 // Increment top past the end of the block. 2009 b->_top++; 2010 } 2011 // need to allocate a next block. 2012 if (b->_next == NULL) { 2013 b->_next = _last_free = new JNIMethodBlockNode(); 2014 } 2015 } 2016 guarantee(false, "Should always allocate a free block"); 2017 return NULL; 2018 } 2019 2020 bool contains(Method** m) { 2021 if (m == NULL) return false; 2022 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2023 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2024 // This is a bit of extra checking, for two reasons. One is 2025 // that contains() deals with pointers that are passed in by 2026 // JNI code, so making sure that the pointer is aligned 2027 // correctly is valuable. The other is that <= and > are 2028 // technically not defined on pointers, so the if guard can 2029 // pass spuriously; no modern compiler is likely to make that 2030 // a problem, though (and if one did, the guard could also 2031 // fail spuriously, which would be bad). 2032 ptrdiff_t idx = m - b->_methods; 2033 if (b->_methods + idx == m) { 2034 return true; 2035 } 2036 } 2037 } 2038 return false; // not found 2039 } 2040 2041 // Doesn't really destroy it, just marks it as free so it can be reused. 2042 void destroy_method(Method** m) { 2043 #ifdef ASSERT 2044 assert(contains(m), "should be a methodID"); 2045 #endif // ASSERT 2046 *m = _free_method; 2047 } 2048 2049 // During class unloading the methods are cleared, which is different 2050 // than freed. 2051 void clear_all_methods() { 2052 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2053 for (int i = 0; i< b->_number_of_methods; i++) { 2054 b->_methods[i] = NULL; 2055 } 2056 } 2057 } 2058 #ifndef PRODUCT 2059 int count_methods() { 2060 // count all allocated methods 2061 int count = 0; 2062 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2063 for (int i = 0; i< b->_number_of_methods; i++) { 2064 if (b->_methods[i] != _free_method) count++; 2065 } 2066 } 2067 return count; 2068 } 2069 #endif // PRODUCT 2070 }; 2071 2072 // Something that can't be mistaken for an address or a markOop 2073 Method* const JNIMethodBlock::_free_method = (Method*)55; 2074 2075 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _top(0), _next(NULL) { 2076 _number_of_methods = MAX2(num_methods, min_block_size); 2077 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2078 for (int i = 0; i < _number_of_methods; i++) { 2079 _methods[i] = JNIMethodBlock::_free_method; 2080 } 2081 } 2082 2083 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) { 2084 ClassLoaderData* cld = loader_data; 2085 if (!SafepointSynchronize::is_at_safepoint()) { 2086 // Have to add jmethod_ids() to class loader data thread-safely. 2087 // Also have to add the method to the list safely, which the cld lock 2088 // protects as well. 2089 MutexLocker ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2090 if (cld->jmethod_ids() == NULL) { 2091 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2092 } else { 2093 cld->jmethod_ids()->ensure_methods(capacity); 2094 } 2095 } else { 2096 // At safepoint, we are single threaded and can set this. 2097 if (cld->jmethod_ids() == NULL) { 2098 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2099 } else { 2100 cld->jmethod_ids()->ensure_methods(capacity); 2101 } 2102 } 2103 } 2104 2105 // Add a method id to the jmethod_ids 2106 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 2107 ClassLoaderData* cld = loader_data; 2108 2109 if (!SafepointSynchronize::is_at_safepoint()) { 2110 // Have to add jmethod_ids() to class loader data thread-safely. 2111 // Also have to add the method to the list safely, which the cld lock 2112 // protects as well. 2113 MutexLocker ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2114 if (cld->jmethod_ids() == NULL) { 2115 cld->set_jmethod_ids(new JNIMethodBlock()); 2116 } 2117 // jmethodID is a pointer to Method* 2118 return (jmethodID)cld->jmethod_ids()->add_method(m); 2119 } else { 2120 // At safepoint, we are single threaded and can set this. 2121 if (cld->jmethod_ids() == NULL) { 2122 cld->set_jmethod_ids(new JNIMethodBlock()); 2123 } 2124 // jmethodID is a pointer to Method* 2125 return (jmethodID)cld->jmethod_ids()->add_method(m); 2126 } 2127 } 2128 2129 // Mark a jmethodID as free. This is called when there is a data race in 2130 // InstanceKlass while creating the jmethodID cache. 2131 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 2132 ClassLoaderData* cld = loader_data; 2133 Method** ptr = (Method**)m; 2134 assert(cld->jmethod_ids() != NULL, "should have method handles"); 2135 cld->jmethod_ids()->destroy_method(ptr); 2136 } 2137 2138 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2139 // Can't assert the method_holder is the same because the new method has the 2140 // scratch method holder. 2141 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2142 == new_method->method_holder()->class_loader() || 2143 new_method->method_holder()->class_loader() == NULL, // allow Unsafe substitution 2144 "changing to a different class loader"); 2145 // Just change the method in place, jmethodID pointer doesn't change. 2146 *((Method**)jmid) = new_method; 2147 } 2148 2149 bool Method::is_method_id(jmethodID mid) { 2150 Method* m = resolve_jmethod_id(mid); 2151 assert(m != NULL, "should be called with non-null method"); 2152 InstanceKlass* ik = m->method_holder(); 2153 ClassLoaderData* cld = ik->class_loader_data(); 2154 if (cld->jmethod_ids() == NULL) return false; 2155 return (cld->jmethod_ids()->contains((Method**)mid)); 2156 } 2157 2158 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2159 if (mid == NULL) return NULL; 2160 Method* o = resolve_jmethod_id(mid); 2161 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 2162 return NULL; 2163 } 2164 return o; 2165 }; 2166 2167 void Method::set_on_stack(const bool value) { 2168 // Set both the method itself and its constant pool. The constant pool 2169 // on stack means some method referring to it is also on the stack. 2170 constants()->set_on_stack(value); 2171 2172 bool already_set = on_stack(); 2173 _access_flags.set_on_stack(value); 2174 if (value && !already_set) { 2175 MetadataOnStackMark::record(this); 2176 } 2177 assert(!value || !is_old() || is_obsolete() || is_running_emcp(), 2178 "emcp methods cannot run after emcp bit is cleared"); 2179 } 2180 2181 // Called when the class loader is unloaded to make all methods weak. 2182 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2183 loader_data->jmethod_ids()->clear_all_methods(); 2184 } 2185 2186 bool Method::has_method_vptr(const void* ptr) { 2187 Method m; 2188 // This assumes that the vtbl pointer is the first word of a C++ object. 2189 return dereference_vptr(&m) == dereference_vptr(ptr); 2190 } 2191 2192 // Check that this pointer is valid by checking that the vtbl pointer matches 2193 bool Method::is_valid_method(const Method* m) { 2194 if (m == NULL) { 2195 return false; 2196 } else if ((intptr_t(m) & (wordSize-1)) != 0) { 2197 // Quick sanity check on pointer. 2198 return false; 2199 } else if (m->is_shared()) { 2200 return MetaspaceShared::is_valid_shared_method(m); 2201 } else if (Metaspace::contains_non_shared(m)) { 2202 return has_method_vptr((const void*)m); 2203 } else { 2204 return false; 2205 } 2206 } 2207 2208 #ifndef PRODUCT 2209 void Method::print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) { 2210 out->print(" jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 2211 } 2212 #endif // PRODUCT 2213 2214 2215 // Printing 2216 2217 #ifndef PRODUCT 2218 2219 void Method::print_on(outputStream* st) const { 2220 ResourceMark rm; 2221 assert(is_method(), "must be method"); 2222 st->print_cr("%s", internal_name()); 2223 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this)); 2224 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2225 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants())); 2226 constants()->print_value_on(st); st->cr(); 2227 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2228 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2229 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2230 st->print_cr(" - max stack: %d", max_stack()); 2231 st->print_cr(" - max locals: %d", max_locals()); 2232 st->print_cr(" - size of params: %d", size_of_parameters()); 2233 st->print_cr(" - method size: %d", method_size()); 2234 if (intrinsic_id() != vmIntrinsics::_none) 2235 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 2236 if (highest_comp_level() != CompLevel_none) 2237 st->print_cr(" - highest level: %d", highest_comp_level()); 2238 st->print_cr(" - vtable index: %d", _vtable_index); 2239 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry())); 2240 st->print( " - adapters: "); 2241 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2242 if (a == NULL) 2243 st->print_cr(INTPTR_FORMAT, p2i(a)); 2244 else 2245 a->print_adapter_on(st); 2246 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry())); 2247 st->print_cr(" - code size: %d", code_size()); 2248 if (code_size() != 0) { 2249 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base())); 2250 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size())); 2251 } 2252 if (method_data() != NULL) { 2253 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data())); 2254 } 2255 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2256 if (checked_exceptions_length() > 0) { 2257 CheckedExceptionElement* table = checked_exceptions_start(); 2258 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table)); 2259 if (Verbose) { 2260 for (int i = 0; i < checked_exceptions_length(); i++) { 2261 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2262 } 2263 } 2264 } 2265 if (has_linenumber_table()) { 2266 u_char* table = compressed_linenumber_table(); 2267 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table)); 2268 if (Verbose) { 2269 CompressedLineNumberReadStream stream(table); 2270 while (stream.read_pair()) { 2271 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2272 } 2273 } 2274 } 2275 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2276 if (localvariable_table_length() > 0) { 2277 LocalVariableTableElement* table = localvariable_table_start(); 2278 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table)); 2279 if (Verbose) { 2280 for (int i = 0; i < localvariable_table_length(); i++) { 2281 int bci = table[i].start_bci; 2282 int len = table[i].length; 2283 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2284 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2285 int slot = table[i].slot; 2286 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2287 } 2288 } 2289 } 2290 if (code() != NULL) { 2291 st->print (" - compiled code: "); 2292 code()->print_value_on(st); 2293 } 2294 if (is_native()) { 2295 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function())); 2296 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler())); 2297 } 2298 } 2299 2300 void Method::print_linkage_flags(outputStream* st) { 2301 access_flags().print_on(st); 2302 if (is_default_method()) { 2303 st->print("default "); 2304 } 2305 if (is_overpass()) { 2306 st->print("overpass "); 2307 } 2308 } 2309 #endif //PRODUCT 2310 2311 void Method::print_value_on(outputStream* st) const { 2312 assert(is_method(), "must be method"); 2313 st->print("%s", internal_name()); 2314 print_address_on(st); 2315 st->print(" "); 2316 name()->print_value_on(st); 2317 st->print(" "); 2318 signature()->print_value_on(st); 2319 st->print(" in "); 2320 method_holder()->print_value_on(st); 2321 if (WizardMode) st->print("#%d", _vtable_index); 2322 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2323 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2324 } 2325 2326 #if INCLUDE_SERVICES 2327 // Size Statistics 2328 void Method::collect_statistics(KlassSizeStats *sz) const { 2329 int mysize = sz->count(this); 2330 sz->_method_bytes += mysize; 2331 sz->_method_all_bytes += mysize; 2332 sz->_rw_bytes += mysize; 2333 2334 if (constMethod()) { 2335 constMethod()->collect_statistics(sz); 2336 } 2337 if (method_data()) { 2338 method_data()->collect_statistics(sz); 2339 } 2340 } 2341 #endif // INCLUDE_SERVICES 2342 2343 // LogTouchedMethods and PrintTouchedMethods 2344 2345 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because 2346 // the Method may be garbage collected. Let's roll our own hash table. 2347 class TouchedMethodRecord : CHeapObj<mtTracing> { 2348 public: 2349 // It's OK to store Symbols here because they will NOT be GC'ed if 2350 // LogTouchedMethods is enabled. 2351 TouchedMethodRecord* _next; 2352 Symbol* _class_name; 2353 Symbol* _method_name; 2354 Symbol* _method_signature; 2355 }; 2356 2357 static const int TOUCHED_METHOD_TABLE_SIZE = 20011; 2358 static TouchedMethodRecord** _touched_method_table = NULL; 2359 2360 void Method::log_touched(TRAPS) { 2361 2362 const int table_size = TOUCHED_METHOD_TABLE_SIZE; 2363 Symbol* my_class = klass_name(); 2364 Symbol* my_name = name(); 2365 Symbol* my_sig = signature(); 2366 2367 unsigned int hash = my_class->identity_hash() + 2368 my_name->identity_hash() + 2369 my_sig->identity_hash(); 2370 juint index = juint(hash) % table_size; 2371 2372 MutexLocker ml(TouchedMethodLog_lock, THREAD); 2373 if (_touched_method_table == NULL) { 2374 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size, 2375 mtTracing, CURRENT_PC); 2376 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size); 2377 } 2378 2379 TouchedMethodRecord* ptr = _touched_method_table[index]; 2380 while (ptr) { 2381 if (ptr->_class_name == my_class && 2382 ptr->_method_name == my_name && 2383 ptr->_method_signature == my_sig) { 2384 return; 2385 } 2386 if (ptr->_next == NULL) break; 2387 ptr = ptr->_next; 2388 } 2389 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing); 2390 my_class->increment_refcount(); 2391 my_name->increment_refcount(); 2392 my_sig->increment_refcount(); 2393 nptr->_class_name = my_class; 2394 nptr->_method_name = my_name; 2395 nptr->_method_signature = my_sig; 2396 nptr->_next = NULL; 2397 2398 if (ptr == NULL) { 2399 // first 2400 _touched_method_table[index] = nptr; 2401 } else { 2402 ptr->_next = nptr; 2403 } 2404 } 2405 2406 void Method::print_touched_methods(outputStream* out) { 2407 MutexLocker ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock); 2408 out->print_cr("# Method::print_touched_methods version 1"); 2409 if (_touched_method_table) { 2410 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) { 2411 TouchedMethodRecord* ptr = _touched_method_table[i]; 2412 while(ptr) { 2413 ptr->_class_name->print_symbol_on(out); out->print("."); 2414 ptr->_method_name->print_symbol_on(out); out->print(":"); 2415 ptr->_method_signature->print_symbol_on(out); out->cr(); 2416 ptr = ptr->_next; 2417 } 2418 } 2419 } 2420 } 2421 2422 // Verification 2423 2424 void Method::verify_on(outputStream* st) { 2425 guarantee(is_method(), "object must be method"); 2426 guarantee(constants()->is_constantPool(), "should be constant pool"); 2427 MethodData* md = method_data(); 2428 guarantee(md == NULL || 2429 md->is_methodData(), "should be method data"); 2430 }