1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/metadataOnStackMark.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "code/codeCache.hpp" 29 #include "code/debugInfoRec.hpp" 30 #include "gc/shared/collectedHeap.inline.hpp" 31 #include "gc/shared/gcLocker.hpp" 32 #include "gc/shared/generation.hpp" 33 #include "interpreter/bytecodeStream.hpp" 34 #include "interpreter/bytecodeTracer.hpp" 35 #include "interpreter/bytecodes.hpp" 36 #include "interpreter/interpreter.hpp" 37 #include "interpreter/oopMapCache.hpp" 38 #include "memory/heapInspection.hpp" 39 #include "memory/metadataFactory.hpp" 40 #include "memory/metaspaceShared.hpp" 41 #include "memory/oopFactory.hpp" 42 #include "memory/resourceArea.hpp" 43 #include "oops/constMethod.hpp" 44 #include "oops/method.hpp" 45 #include "oops/methodData.hpp" 46 #include "oops/objArrayOop.inline.hpp" 47 #include "oops/oop.inline.hpp" 48 #include "oops/symbol.hpp" 49 #include "prims/jvmtiExport.hpp" 50 #include "prims/methodHandles.hpp" 51 #include "prims/nativeLookup.hpp" 52 #include "runtime/arguments.hpp" 53 #include "runtime/compilationPolicy.hpp" 54 #include "runtime/frame.inline.hpp" 55 #include "runtime/handles.inline.hpp" 56 #include "runtime/init.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_force_inline(false); 89 set_hidden(false); 90 set_dont_inline(false); 91 set_has_injected_profile(false); 92 set_method_data(NULL); 93 clear_method_counters(); 94 set_vtable_index(Method::garbage_vtable_index); 95 96 // Fix and bury in Method* 97 set_interpreter_entry(NULL); // sets i2i entry and from_int 98 set_adapter_entry(NULL); 99 clear_code(false /* don't need a lock */); // from_c/from_i get set to c2i/i2i 100 101 if (access_flags.is_native()) { 102 clear_native_function(); 103 set_signature_handler(NULL); 104 } 105 106 NOT_PRODUCT(set_compiled_invocation_count(0);) 107 } 108 109 // Release Method*. The nmethod will be gone when we get here because 110 // we've walked the code cache. 111 void Method::deallocate_contents(ClassLoaderData* loader_data) { 112 MetadataFactory::free_metadata(loader_data, constMethod()); 113 set_constMethod(NULL); 114 MetadataFactory::free_metadata(loader_data, method_data()); 115 set_method_data(NULL); 116 MetadataFactory::free_metadata(loader_data, method_counters()); 117 clear_method_counters(); 118 // The nmethod will be gone when we get here. 119 if (code() != NULL) _code = NULL; 120 } 121 122 address Method::get_i2c_entry() { 123 assert(adapter() != NULL, "must have"); 124 return adapter()->get_i2c_entry(); 125 } 126 127 address Method::get_c2i_entry() { 128 assert(adapter() != NULL, "must have"); 129 return adapter()->get_c2i_entry(); 130 } 131 132 address Method::get_c2i_unverified_entry() { 133 assert(adapter() != NULL, "must have"); 134 return adapter()->get_c2i_unverified_entry(); 135 } 136 137 char* Method::name_and_sig_as_C_string() const { 138 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 139 } 140 141 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 142 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 143 } 144 145 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 146 const char* klass_name = klass->external_name(); 147 int klass_name_len = (int)strlen(klass_name); 148 int method_name_len = method_name->utf8_length(); 149 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 150 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 151 strcpy(dest, klass_name); 152 dest[klass_name_len] = '.'; 153 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 154 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 155 dest[len] = 0; 156 return dest; 157 } 158 159 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 160 Symbol* klass_name = klass->name(); 161 klass_name->as_klass_external_name(buf, size); 162 int len = (int)strlen(buf); 163 164 if (len < size - 1) { 165 buf[len++] = '.'; 166 167 method_name->as_C_string(&(buf[len]), size - len); 168 len = (int)strlen(buf); 169 170 signature->as_C_string(&(buf[len]), size - len); 171 } 172 173 return buf; 174 } 175 176 int Method::fast_exception_handler_bci_for(methodHandle mh, Klass* ex_klass, int throw_bci, TRAPS) { 177 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 178 // access exception table 179 ExceptionTable table(mh()); 180 int length = table.length(); 181 // iterate through all entries sequentially 182 constantPoolHandle pool(THREAD, mh->constants()); 183 for (int i = 0; i < length; i ++) { 184 //reacquire the table in case a GC happened 185 ExceptionTable table(mh()); 186 int beg_bci = table.start_pc(i); 187 int end_bci = table.end_pc(i); 188 assert(beg_bci <= end_bci, "inconsistent exception table"); 189 if (beg_bci <= throw_bci && throw_bci < end_bci) { 190 // exception handler bci range covers throw_bci => investigate further 191 int handler_bci = table.handler_pc(i); 192 int klass_index = table.catch_type_index(i); 193 if (klass_index == 0) { 194 return handler_bci; 195 } else if (ex_klass == NULL) { 196 return handler_bci; 197 } else { 198 // we know the exception class => get the constraint class 199 // this may require loading of the constraint class; if verification 200 // fails or some other exception occurs, return handler_bci 201 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); 202 assert(k != NULL, "klass not loaded"); 203 if (ex_klass->is_subtype_of(k)) { 204 return handler_bci; 205 } 206 } 207 } 208 } 209 210 return -1; 211 } 212 213 void Method::mask_for(int bci, InterpreterOopMap* mask) { 214 215 Thread* myThread = Thread::current(); 216 methodHandle h_this(myThread, this); 217 #if defined(ASSERT) && !INCLUDE_JVMCI 218 bool has_capability = myThread->is_VM_thread() || 219 myThread->is_ConcurrentGC_thread() || 220 myThread->is_GC_task_thread(); 221 222 if (!has_capability) { 223 if (!VerifyStack && !VerifyLastFrame) { 224 // verify stack calls this outside VM thread 225 warning("oopmap should only be accessed by the " 226 "VM, GC task or CMS threads (or during debugging)"); 227 InterpreterOopMap local_mask; 228 method_holder()->mask_for(h_this, bci, &local_mask); 229 local_mask.print(); 230 } 231 } 232 #endif 233 method_holder()->mask_for(h_this, bci, mask); 234 return; 235 } 236 237 238 int Method::bci_from(address bcp) const { 239 if (is_native() && bcp == 0) { 240 return 0; 241 } 242 #ifdef ASSERT 243 { 244 ResourceMark rm; 245 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), 246 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", 247 p2i(bcp), name_and_sig_as_C_string()); 248 } 249 #endif 250 return bcp - code_base(); 251 } 252 253 254 int Method::validate_bci(int bci) const { 255 return (bci == 0 || bci < code_size()) ? bci : -1; 256 } 257 258 // Return bci if it appears to be a valid bcp 259 // Return -1 otherwise. 260 // Used by profiling code, when invalid data is a possibility. 261 // The caller is responsible for validating the Method* itself. 262 int Method::validate_bci_from_bcp(address bcp) const { 263 // keep bci as -1 if not a valid bci 264 int bci = -1; 265 if (bcp == 0 || bcp == code_base()) { 266 // code_size() may return 0 and we allow 0 here 267 // the method may be native 268 bci = 0; 269 } else if (contains(bcp)) { 270 bci = bcp - code_base(); 271 } 272 // Assert that if we have dodged any asserts, bci is negative. 273 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 274 return bci; 275 } 276 277 address Method::bcp_from(int bci) const { 278 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), 279 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native"); 280 address bcp = code_base() + bci; 281 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 282 return bcp; 283 } 284 285 address Method::bcp_from(address bcp) const { 286 if (is_native() && bcp == NULL) { 287 return code_base(); 288 } else { 289 return bcp; 290 } 291 } 292 293 int Method::size(bool is_native) { 294 // If native, then include pointers for native_function and signature_handler 295 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 296 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; 297 return align_metadata_size(header_size() + extra_words); 298 } 299 300 301 Symbol* Method::klass_name() const { 302 return method_holder()->name(); 303 } 304 305 306 // Attempt to return method oop to original state. Clear any pointers 307 // (to objects outside the shared spaces). We won't be able to predict 308 // where they should point in a new JVM. Further initialize some 309 // entries now in order allow them to be write protected later. 310 311 void Method::remove_unshareable_info() { 312 unlink_method(); 313 } 314 315 void Method::set_vtable_index(int index) { 316 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 317 // At runtime initialize_vtable is rerun as part of link_class_impl() 318 // for a shared class loaded by the non-boot loader to obtain the loader 319 // constraints based on the runtime classloaders' context. 320 return; // don't write into the shared class 321 } else { 322 _vtable_index = index; 323 } 324 } 325 326 void Method::set_itable_index(int index) { 327 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 328 // At runtime initialize_itable is rerun as part of link_class_impl() 329 // for a shared class loaded by the non-boot loader to obtain the loader 330 // constraints based on the runtime classloaders' context. The dumptime 331 // itable index should be the same as the runtime index. 332 assert(_vtable_index == itable_index_max - index, 333 "archived itable index is different from runtime index"); 334 return; // don’t write into the shared class 335 } else { 336 _vtable_index = itable_index_max - index; 337 } 338 assert(valid_itable_index(), ""); 339 } 340 341 342 343 bool Method::was_executed_more_than(int n) { 344 // Invocation counter is reset when the Method* is compiled. 345 // If the method has compiled code we therefore assume it has 346 // be excuted more than n times. 347 if (is_accessor() || is_empty_method() || (code() != NULL)) { 348 // interpreter doesn't bump invocation counter of trivial methods 349 // compiler does not bump invocation counter of compiled methods 350 return true; 351 } 352 else if ((method_counters() != NULL && 353 method_counters()->invocation_counter()->carry()) || 354 (method_data() != NULL && 355 method_data()->invocation_counter()->carry())) { 356 // The carry bit is set when the counter overflows and causes 357 // a compilation to occur. We don't know how many times 358 // the counter has been reset, so we simply assume it has 359 // been executed more than n times. 360 return true; 361 } else { 362 return invocation_count() > n; 363 } 364 } 365 366 void Method::print_invocation_count() { 367 if (is_static()) tty->print("static "); 368 if (is_final()) tty->print("final "); 369 if (is_synchronized()) tty->print("synchronized "); 370 if (is_native()) tty->print("native "); 371 tty->print("%s::", method_holder()->external_name()); 372 name()->print_symbol_on(tty); 373 signature()->print_symbol_on(tty); 374 375 if (WizardMode) { 376 // dump the size of the byte codes 377 tty->print(" {%d}", code_size()); 378 } 379 tty->cr(); 380 381 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 382 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 383 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 384 #ifndef PRODUCT 385 if (CountCompiledCalls) { 386 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 387 } 388 #endif 389 } 390 391 // Build a MethodData* object to hold information about this method 392 // collected in the interpreter. 393 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) { 394 // Do not profile the method if metaspace has hit an OOM previously 395 // allocating profiling data. Callers clear pending exception so don't 396 // add one here. 397 if (ClassLoaderDataGraph::has_metaspace_oom()) { 398 return; 399 } 400 401 // Grab a lock here to prevent multiple 402 // MethodData*s from being created. 403 MutexLocker ml(MethodData_lock, THREAD); 404 if (method->method_data() == NULL) { 405 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 406 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 407 if (HAS_PENDING_EXCEPTION) { 408 CompileBroker::log_metaspace_failure(); 409 ClassLoaderDataGraph::set_metaspace_oom(true); 410 return; // return the exception (which is cleared) 411 } 412 413 method->set_method_data(method_data); 414 if (PrintMethodData && (Verbose || WizardMode)) { 415 ResourceMark rm(THREAD); 416 tty->print("build_interpreter_method_data for "); 417 method->print_name(tty); 418 tty->cr(); 419 // At the end of the run, the MDO, full of data, will be dumped. 420 } 421 } 422 } 423 424 MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 425 // Do not profile the method if metaspace has hit an OOM previously 426 if (ClassLoaderDataGraph::has_metaspace_oom()) { 427 return NULL; 428 } 429 430 methodHandle mh(m); 431 MethodCounters* counters = MethodCounters::allocate(mh, THREAD); 432 if (HAS_PENDING_EXCEPTION) { 433 CompileBroker::log_metaspace_failure(); 434 ClassLoaderDataGraph::set_metaspace_oom(true); 435 return NULL; // return the exception (which is cleared) 436 } 437 if (!mh->init_method_counters(counters)) { 438 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 439 } 440 441 if (LogTouchedMethods) { 442 mh->log_touched(CHECK_NULL); 443 } 444 445 return mh->method_counters(); 446 } 447 448 void Method::cleanup_inline_caches() { 449 // The current system doesn't use inline caches in the interpreter 450 // => nothing to do (keep this method around for future use) 451 } 452 453 454 int Method::extra_stack_words() { 455 // not an inline function, to avoid a header dependency on Interpreter 456 return extra_stack_entries() * Interpreter::stackElementSize; 457 } 458 459 460 void Method::compute_size_of_parameters(Thread *thread) { 461 ArgumentSizeComputer asc(signature()); 462 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 463 } 464 465 BasicType Method::result_type() const { 466 ResultTypeFinder rtf(signature()); 467 return rtf.type(); 468 } 469 470 471 bool Method::is_empty_method() const { 472 return code_size() == 1 473 && *code_base() == Bytecodes::_return; 474 } 475 476 477 bool Method::is_vanilla_constructor() const { 478 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 479 // which only calls the superclass vanilla constructor and possibly does stores of 480 // zero constants to local fields: 481 // 482 // aload_0 483 // invokespecial 484 // indexbyte1 485 // indexbyte2 486 // 487 // followed by an (optional) sequence of: 488 // 489 // aload_0 490 // aconst_null / iconst_0 / fconst_0 / dconst_0 491 // putfield 492 // indexbyte1 493 // indexbyte2 494 // 495 // followed by: 496 // 497 // return 498 499 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 500 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 501 int size = code_size(); 502 // Check if size match 503 if (size == 0 || size % 5 != 0) return false; 504 address cb = code_base(); 505 int last = size - 1; 506 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 507 // Does not call superclass default constructor 508 return false; 509 } 510 // Check optional sequence 511 for (int i = 4; i < last; i += 5) { 512 if (cb[i] != Bytecodes::_aload_0) return false; 513 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 514 if (cb[i+2] != Bytecodes::_putfield) return false; 515 } 516 return true; 517 } 518 519 520 bool Method::compute_has_loops_flag() { 521 BytecodeStream bcs(this); 522 Bytecodes::Code bc; 523 524 while ((bc = bcs.next()) >= 0) { 525 switch( bc ) { 526 case Bytecodes::_ifeq: 527 case Bytecodes::_ifnull: 528 case Bytecodes::_iflt: 529 case Bytecodes::_ifle: 530 case Bytecodes::_ifne: 531 case Bytecodes::_ifnonnull: 532 case Bytecodes::_ifgt: 533 case Bytecodes::_ifge: 534 case Bytecodes::_if_icmpeq: 535 case Bytecodes::_if_icmpne: 536 case Bytecodes::_if_icmplt: 537 case Bytecodes::_if_icmpgt: 538 case Bytecodes::_if_icmple: 539 case Bytecodes::_if_icmpge: 540 case Bytecodes::_if_acmpeq: 541 case Bytecodes::_if_acmpne: 542 case Bytecodes::_goto: 543 case Bytecodes::_jsr: 544 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 545 break; 546 547 case Bytecodes::_goto_w: 548 case Bytecodes::_jsr_w: 549 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 550 break; 551 552 default: 553 break; 554 } 555 } 556 _access_flags.set_loops_flag_init(); 557 return _access_flags.has_loops(); 558 } 559 560 bool Method::is_final_method(AccessFlags class_access_flags) const { 561 // or "does_not_require_vtable_entry" 562 // default method or overpass can occur, is not final (reuses vtable entry) 563 // private methods in classes get vtable entries for backward class compatibility. 564 if (is_overpass() || is_default_method()) return false; 565 return is_final() || class_access_flags.is_final(); 566 } 567 568 bool Method::is_final_method() const { 569 return is_final_method(method_holder()->access_flags()); 570 } 571 572 bool Method::is_default_method() const { 573 if (method_holder() != NULL && 574 method_holder()->is_interface() && 575 !is_abstract() && !is_private()) { 576 return true; 577 } else { 578 return false; 579 } 580 } 581 582 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 583 if (is_final_method(class_access_flags)) return true; 584 #ifdef ASSERT 585 ResourceMark rm; 586 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 587 if (class_access_flags.is_interface()) { 588 assert(is_nonv == is_static() || is_nonv == is_private(), 589 "nonvirtual unexpected for non-static, non-private: %s", 590 name_and_sig_as_C_string()); 591 } 592 #endif 593 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 594 return vtable_index() == nonvirtual_vtable_index; 595 } 596 597 bool Method::can_be_statically_bound() const { 598 return can_be_statically_bound(method_holder()->access_flags()); 599 } 600 601 bool Method::is_accessor() const { 602 return is_getter() || is_setter(); 603 } 604 605 bool Method::is_getter() const { 606 if (code_size() != 5) return false; 607 if (size_of_parameters() != 1) return false; 608 if (java_code_at(0) != Bytecodes::_aload_0) return false; 609 if (java_code_at(1) != Bytecodes::_getfield) return false; 610 switch (java_code_at(4)) { 611 case Bytecodes::_ireturn: 612 case Bytecodes::_lreturn: 613 case Bytecodes::_freturn: 614 case Bytecodes::_dreturn: 615 case Bytecodes::_areturn: 616 break; 617 default: 618 return false; 619 } 620 return true; 621 } 622 623 bool Method::is_setter() const { 624 if (code_size() != 6) return false; 625 if (java_code_at(0) != Bytecodes::_aload_0) return false; 626 switch (java_code_at(1)) { 627 case Bytecodes::_iload_1: 628 case Bytecodes::_aload_1: 629 case Bytecodes::_fload_1: 630 if (size_of_parameters() != 2) return false; 631 break; 632 case Bytecodes::_dload_1: 633 case Bytecodes::_lload_1: 634 if (size_of_parameters() != 3) return false; 635 break; 636 default: 637 return false; 638 } 639 if (java_code_at(2) != Bytecodes::_putfield) return false; 640 if (java_code_at(5) != Bytecodes::_return) return false; 641 return true; 642 } 643 644 bool Method::is_constant_getter() const { 645 int last_index = code_size() - 1; 646 // Check if the first 1-3 bytecodes are a constant push 647 // and the last bytecode is a return. 648 return (2 <= code_size() && code_size() <= 4 && 649 Bytecodes::is_const(java_code_at(0)) && 650 Bytecodes::length_for(java_code_at(0)) == last_index && 651 Bytecodes::is_return(java_code_at(last_index))); 652 } 653 654 bool Method::is_initializer() const { 655 return is_object_initializer() || is_static_initializer(); 656 } 657 658 bool Method::has_valid_initializer_flags() const { 659 return (is_static() || 660 method_holder()->major_version() < 51); 661 } 662 663 bool Method::is_static_initializer() const { 664 // For classfiles version 51 or greater, ensure that the clinit method is 665 // static. Non-static methods with the name "<clinit>" are not static 666 // initializers. (older classfiles exempted for backward compatibility) 667 return name() == vmSymbols::class_initializer_name() && 668 has_valid_initializer_flags(); 669 } 670 671 bool Method::is_object_initializer() const { 672 return name() == vmSymbols::object_initializer_name(); 673 } 674 675 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 676 int length = method->checked_exceptions_length(); 677 if (length == 0) { // common case 678 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 679 } else { 680 methodHandle h_this(THREAD, method); 681 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 682 objArrayHandle mirrors (THREAD, m_oop); 683 for (int i = 0; i < length; i++) { 684 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 685 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 686 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 687 mirrors->obj_at_put(i, k->java_mirror()); 688 } 689 return mirrors; 690 } 691 }; 692 693 694 int Method::line_number_from_bci(int bci) const { 695 if (bci == SynchronizationEntryBCI) bci = 0; 696 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 697 int best_bci = 0; 698 int best_line = -1; 699 700 if (has_linenumber_table()) { 701 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 702 // Not necessarily sorted and not necessarily one-to-one. 703 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 704 while (stream.read_pair()) { 705 if (stream.bci() == bci) { 706 // perfect match 707 return stream.line(); 708 } else { 709 // update best_bci/line 710 if (stream.bci() < bci && stream.bci() >= best_bci) { 711 best_bci = stream.bci(); 712 best_line = stream.line(); 713 } 714 } 715 } 716 } 717 return best_line; 718 } 719 720 721 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 722 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 723 Thread *thread = Thread::current(); 724 Symbol* klass_name = constants()->klass_name_at(klass_index); 725 Handle loader(thread, method_holder()->class_loader()); 726 Handle prot (thread, method_holder()->protection_domain()); 727 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 728 } else { 729 return true; 730 } 731 } 732 733 734 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 735 int klass_index = constants()->klass_ref_index_at(refinfo_index); 736 if (must_be_resolved) { 737 // Make sure klass is resolved in constantpool. 738 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 739 } 740 return is_klass_loaded_by_klass_index(klass_index); 741 } 742 743 744 void Method::set_native_function(address function, bool post_event_flag) { 745 assert(function != NULL, "use clear_native_function to unregister natives"); 746 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 747 address* native_function = native_function_addr(); 748 749 // We can see racers trying to place the same native function into place. Once 750 // is plenty. 751 address current = *native_function; 752 if (current == function) return; 753 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 754 function != NULL) { 755 // native_method_throw_unsatisfied_link_error_entry() should only 756 // be passed when post_event_flag is false. 757 assert(function != 758 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 759 "post_event_flag mis-match"); 760 761 // post the bind event, and possible change the bind function 762 JvmtiExport::post_native_method_bind(this, &function); 763 } 764 *native_function = function; 765 // This function can be called more than once. We must make sure that we always 766 // use the latest registered method -> check if a stub already has been generated. 767 // If so, we have to make it not_entrant. 768 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates 769 if (nm != NULL) { 770 nm->make_not_entrant(); 771 } 772 } 773 774 775 bool Method::has_native_function() const { 776 if (is_method_handle_intrinsic()) 777 return false; // special-cased in SharedRuntime::generate_native_wrapper 778 address func = native_function(); 779 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 780 } 781 782 783 void Method::clear_native_function() { 784 // Note: is_method_handle_intrinsic() is allowed here. 785 set_native_function( 786 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 787 !native_bind_event_is_interesting); 788 clear_code(); 789 } 790 791 address Method::critical_native_function() { 792 methodHandle mh(this); 793 return NativeLookup::lookup_critical_entry(mh); 794 } 795 796 797 void Method::set_signature_handler(address handler) { 798 address* signature_handler = signature_handler_addr(); 799 *signature_handler = handler; 800 } 801 802 803 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 804 if (PrintCompilation && report) { 805 ttyLocker ttyl; 806 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 807 if (comp_level == CompLevel_all) { 808 tty->print("all levels "); 809 } else { 810 tty->print("levels "); 811 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 812 tty->print("%d ", i); 813 } 814 } 815 this->print_short_name(tty); 816 int size = this->code_size(); 817 if (size > 0) { 818 tty->print(" (%d bytes)", size); 819 } 820 if (reason != NULL) { 821 tty->print(" %s", reason); 822 } 823 tty->cr(); 824 } 825 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 826 ttyLocker ttyl; 827 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 828 os::current_thread_id(), is_osr, comp_level); 829 if (reason != NULL) { 830 xtty->print(" reason=\'%s\'", reason); 831 } 832 xtty->method(this); 833 xtty->stamp(); 834 xtty->end_elem(); 835 } 836 } 837 838 bool Method::is_always_compilable() const { 839 // Generated adapters must be compiled 840 if (is_method_handle_intrinsic() && is_synthetic()) { 841 assert(!is_not_c1_compilable(), "sanity check"); 842 assert(!is_not_c2_compilable(), "sanity check"); 843 return true; 844 } 845 846 return false; 847 } 848 849 bool Method::is_not_compilable(int comp_level) const { 850 if (number_of_breakpoints() > 0) 851 return true; 852 if (is_always_compilable()) 853 return false; 854 if (comp_level == CompLevel_any) 855 return is_not_c1_compilable() || is_not_c2_compilable(); 856 if (is_c1_compile(comp_level)) 857 return is_not_c1_compilable(); 858 if (is_c2_compile(comp_level)) 859 return is_not_c2_compilable(); 860 return false; 861 } 862 863 // call this when compiler finds that this method is not compilable 864 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 865 if (is_always_compilable()) { 866 // Don't mark a method which should be always compilable 867 return; 868 } 869 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 870 if (comp_level == CompLevel_all) { 871 set_not_c1_compilable(); 872 set_not_c2_compilable(); 873 } else { 874 if (is_c1_compile(comp_level)) 875 set_not_c1_compilable(); 876 if (is_c2_compile(comp_level)) 877 set_not_c2_compilable(); 878 } 879 CompilationPolicy::policy()->disable_compilation(this); 880 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 881 } 882 883 bool Method::is_not_osr_compilable(int comp_level) const { 884 if (is_not_compilable(comp_level)) 885 return true; 886 if (comp_level == CompLevel_any) 887 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 888 if (is_c1_compile(comp_level)) 889 return is_not_c1_osr_compilable(); 890 if (is_c2_compile(comp_level)) 891 return is_not_c2_osr_compilable(); 892 return false; 893 } 894 895 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 896 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 897 if (comp_level == CompLevel_all) { 898 set_not_c1_osr_compilable(); 899 set_not_c2_osr_compilable(); 900 } else { 901 if (is_c1_compile(comp_level)) 902 set_not_c1_osr_compilable(); 903 if (is_c2_compile(comp_level)) 904 set_not_c2_osr_compilable(); 905 } 906 CompilationPolicy::policy()->disable_compilation(this); 907 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 908 } 909 910 // Revert to using the interpreter and clear out the nmethod 911 void Method::clear_code(bool acquire_lock /* = true */) { 912 MutexLockerEx pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag); 913 // this may be NULL if c2i adapters have not been made yet 914 // Only should happen at allocate time. 915 if (adapter() == NULL) { 916 _from_compiled_entry = NULL; 917 } else { 918 _from_compiled_entry = adapter()->get_c2i_entry(); 919 } 920 OrderAccess::storestore(); 921 _from_interpreted_entry = _i2i_entry; 922 OrderAccess::storestore(); 923 _code = NULL; 924 } 925 926 #if INCLUDE_CDS 927 // Called by class data sharing to remove any entry points (which are not shared) 928 void Method::unlink_method() { 929 _code = NULL; 930 931 assert(DumpSharedSpaces, "dump time only"); 932 // Set the values to what they should be at run time. Note that 933 // this Method can no longer be executed during dump time. 934 _i2i_entry = Interpreter::entry_for_cds_method(this); 935 _from_interpreted_entry = _i2i_entry; 936 937 if (is_native()) { 938 *native_function_addr() = NULL; 939 set_signature_handler(NULL); 940 } 941 NOT_PRODUCT(set_compiled_invocation_count(0);) 942 943 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter(); 944 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline()); 945 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline(); 946 assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time"); 947 948 949 // In case of DumpSharedSpaces, _method_data should always be NULL. 950 assert(_method_data == NULL, "unexpected method data?"); 951 952 set_method_data(NULL); 953 clear_method_counters(); 954 } 955 #endif 956 957 /**************************************************************************** 958 // The following illustrates how the entries work for CDS shared Methods: 959 // 960 // Our goal is to delay writing into a shared Method until it's compiled. 961 // Hence, we want to determine the initial values for _i2i_entry, 962 // _from_interpreted_entry and _from_compiled_entry during CDS dump time. 963 // 964 // In this example, both Methods A and B have the _i2i_entry of "zero_locals". 965 // They also have similar signatures so that they will share the same 966 // AdapterHandlerEntry. 967 // 968 // _adapter_trampoline points to a fixed location in the RW section of 969 // the CDS archive. This location initially contains a NULL pointer. When the 970 // first of method A or B is linked, an AdapterHandlerEntry is allocated 971 // dynamically, and its c2i/i2c entries are generated. 972 // 973 // _i2i_entry and _from_interpreted_entry initially points to the same 974 // (fixed) location in the CODE section of the CDS archive. This contains 975 // an unconditional branch to the actual entry for "zero_locals", which is 976 // generated at run time and may be on an arbitrary address. Thus, the 977 // unconditional branch is also generated at run time to jump to the correct 978 // address. 979 // 980 // Similarly, _from_compiled_entry points to a fixed address in the CODE 981 // section. This address has enough space for an unconditional branch 982 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is 983 // initialized, and the address for the actual c2i_entry is known, we emit a 984 // branch instruction here to branch to the actual c2i_entry. 985 // 986 // The effect of the extra branch on the i2i and c2i entries is negligible. 987 // 988 // The reason for putting _adapter_trampoline in RO is many shared Methods 989 // share the same AdapterHandlerEntry, so we can save space in the RW section 990 // by having the extra indirection. 991 992 993 [Method A: RW] 994 _constMethod ----> [ConstMethod: RO] 995 _adapter_trampoline -----------+ 996 | 997 _i2i_entry (same value as method B) | 998 _from_interpreted_entry (same value as method B) | 999 _from_compiled_entry (same value as method B) | 1000 | 1001 | 1002 [Method B: RW] +--------+ 1003 _constMethod ----> [ConstMethod: RO] | 1004 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+ 1005 | 1006 +-------------------------------+ 1007 | 1008 +----> [AdapterHandlerEntry] (allocated at run time) 1009 _fingerprint 1010 _c2i_entry ---------------------------------+->[c2i entry..] 1011 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] | 1012 _from_interpreted_entry | _c2i_unverified_entry | | 1013 | | | | 1014 | | (_cds_entry_table: CODE) | | 1015 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | | 1016 | | (allocated at run time) | | 1017 | | ... [asm code ...] | | 1018 +-[not compiled]-+ [n]: jmp _entry_table[n] | | 1019 | | | 1020 | | | 1021 +-[compiled]-------------------------------------------------------------------+ | 1022 | 1023 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) | 1024 [jmp c2i_entry] ------------------------------------------------------+ 1025 1026 ***/ 1027 1028 // Called when the method_holder is getting linked. Setup entrypoints so the method 1029 // is ready to be called from interpreter, compiler, and vtables. 1030 void Method::link_method(const methodHandle& h_method, TRAPS) { 1031 // If the code cache is full, we may reenter this function for the 1032 // leftover methods that weren't linked. 1033 if (is_shared()) { 1034 address entry = Interpreter::entry_for_cds_method(h_method); 1035 assert(entry != NULL && entry == _i2i_entry, 1036 "should be correctly set during dump time"); 1037 if (adapter() != NULL) { 1038 return; 1039 } 1040 assert(entry == _from_interpreted_entry, 1041 "should be correctly set during dump time"); 1042 } else if (_i2i_entry != NULL) { 1043 return; 1044 } 1045 assert( _code == NULL, "nothing compiled yet" ); 1046 1047 // Setup interpreter entrypoint 1048 assert(this == h_method(), "wrong h_method()" ); 1049 1050 if (!is_shared()) { 1051 assert(adapter() == NULL, "init'd to NULL"); 1052 address entry = Interpreter::entry_for_method(h_method); 1053 assert(entry != NULL, "interpreter entry must be non-null"); 1054 // Sets both _i2i_entry and _from_interpreted_entry 1055 set_interpreter_entry(entry); 1056 } 1057 1058 // Don't overwrite already registered native entries. 1059 if (is_native() && !has_native_function()) { 1060 set_native_function( 1061 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1062 !native_bind_event_is_interesting); 1063 } 1064 1065 // Setup compiler entrypoint. This is made eagerly, so we do not need 1066 // special handling of vtables. An alternative is to make adapters more 1067 // lazily by calling make_adapter() from from_compiled_entry() for the 1068 // normal calls. For vtable calls life gets more complicated. When a 1069 // call-site goes mega-morphic we need adapters in all methods which can be 1070 // called from the vtable. We need adapters on such methods that get loaded 1071 // later. Ditto for mega-morphic itable calls. If this proves to be a 1072 // problem we'll make these lazily later. 1073 (void) make_adapters(h_method, CHECK); 1074 1075 // ONLY USE the h_method now as make_adapter may have blocked 1076 1077 } 1078 1079 address Method::make_adapters(methodHandle mh, TRAPS) { 1080 // Adapters for compiled code are made eagerly here. They are fairly 1081 // small (generally < 100 bytes) and quick to make (and cached and shared) 1082 // so making them eagerly shouldn't be too expensive. 1083 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1084 if (adapter == NULL ) { 1085 if (!is_init_completed()) { 1086 // Don't throw exceptions during VM initialization because java.lang.* classes 1087 // might not have been initialized, causing problems when constructing the 1088 // Java exception object. 1089 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1090 } else { 1091 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters"); 1092 } 1093 } 1094 1095 if (mh->is_shared()) { 1096 assert(mh->adapter() == adapter, "must be"); 1097 assert(mh->_from_compiled_entry != NULL, "must be"); 1098 } else { 1099 mh->set_adapter_entry(adapter); 1100 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1101 } 1102 return adapter->get_c2i_entry(); 1103 } 1104 1105 void Method::restore_unshareable_info(TRAPS) { 1106 assert(is_method() && is_valid_method(), "ensure C++ vtable is restored"); 1107 1108 // Since restore_unshareable_info can be called more than once for a method, don't 1109 // redo any work. 1110 if (adapter() == NULL) { 1111 methodHandle mh(THREAD, this); 1112 link_method(mh, CHECK); 1113 } 1114 } 1115 1116 volatile address Method::from_compiled_entry_no_trampoline() const { 1117 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 1118 if (code) { 1119 return code->verified_entry_point(); 1120 } else { 1121 return adapter()->get_c2i_entry(); 1122 } 1123 } 1124 1125 // The verified_code_entry() must be called when a invoke is resolved 1126 // on this method. 1127 1128 // It returns the compiled code entry point, after asserting not null. 1129 // This function is called after potential safepoints so that nmethod 1130 // or adapter that it points to is still live and valid. 1131 // This function must not hit a safepoint! 1132 address Method::verified_code_entry() { 1133 debug_only(NoSafepointVerifier nsv;) 1134 assert(_from_compiled_entry != NULL, "must be set"); 1135 return _from_compiled_entry; 1136 } 1137 1138 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1139 // (could be racing a deopt). 1140 // Not inline to avoid circular ref. 1141 bool Method::check_code() const { 1142 // cached in a register or local. There's a race on the value of the field. 1143 CompiledMethod *code = (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code); 1144 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 1145 } 1146 1147 // Install compiled code. Instantly it can execute. 1148 void Method::set_code(methodHandle mh, CompiledMethod *code) { 1149 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1150 assert( code, "use clear_code to remove code" ); 1151 assert( mh->check_code(), "" ); 1152 1153 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 1154 1155 // These writes must happen in this order, because the interpreter will 1156 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1157 // which jumps to _from_compiled_entry. 1158 mh->_code = code; // Assign before allowing compiled code to exec 1159 1160 int comp_level = code->comp_level(); 1161 // In theory there could be a race here. In practice it is unlikely 1162 // and not worth worrying about. 1163 if (comp_level > mh->highest_comp_level()) { 1164 mh->set_highest_comp_level(comp_level); 1165 } 1166 1167 OrderAccess::storestore(); 1168 #ifdef SHARK 1169 mh->_from_interpreted_entry = code->insts_begin(); 1170 #else //!SHARK 1171 mh->_from_compiled_entry = code->verified_entry_point(); 1172 OrderAccess::storestore(); 1173 // Instantly compiled code can execute. 1174 if (!mh->is_method_handle_intrinsic()) 1175 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1176 #endif //!SHARK 1177 } 1178 1179 1180 bool Method::is_overridden_in(Klass* k) const { 1181 InstanceKlass* ik = InstanceKlass::cast(k); 1182 1183 if (ik->is_interface()) return false; 1184 1185 // If method is an interface, we skip it - except if it 1186 // is a miranda method 1187 if (method_holder()->is_interface()) { 1188 // Check that method is not a miranda method 1189 if (ik->lookup_method(name(), signature()) == NULL) { 1190 // No implementation exist - so miranda method 1191 return false; 1192 } 1193 return true; 1194 } 1195 1196 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1197 if (!has_vtable_index()) { 1198 return false; 1199 } else { 1200 Method* vt_m = ik->method_at_vtable(vtable_index()); 1201 return vt_m != this; 1202 } 1203 } 1204 1205 1206 // give advice about whether this Method* should be cached or not 1207 bool Method::should_not_be_cached() const { 1208 if (is_old()) { 1209 // This method has been redefined. It is either EMCP or obsolete 1210 // and we don't want to cache it because that would pin the method 1211 // down and prevent it from being collectible if and when it 1212 // finishes executing. 1213 return true; 1214 } 1215 1216 // caching this method should be just fine 1217 return false; 1218 } 1219 1220 1221 /** 1222 * Returns true if this is one of the specially treated methods for 1223 * security related stack walks (like Reflection.getCallerClass). 1224 */ 1225 bool Method::is_ignored_by_security_stack_walk() const { 1226 if (intrinsic_id() == vmIntrinsics::_invoke) { 1227 // This is Method.invoke() -- ignore it 1228 return true; 1229 } 1230 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1231 // This is an auxilary frame -- ignore it 1232 return true; 1233 } 1234 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1235 // This is an internal adapter frame for method handles -- ignore it 1236 return true; 1237 } 1238 return false; 1239 } 1240 1241 1242 // Constant pool structure for invoke methods: 1243 enum { 1244 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1245 _imcp_invoke_signature, // utf8: (variable Symbol*) 1246 _imcp_limit 1247 }; 1248 1249 // Test if this method is an MH adapter frame generated by Java code. 1250 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1251 bool Method::is_compiled_lambda_form() const { 1252 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1253 } 1254 1255 // Test if this method is an internal MH primitive method. 1256 bool Method::is_method_handle_intrinsic() const { 1257 vmIntrinsics::ID iid = intrinsic_id(); 1258 return (MethodHandles::is_signature_polymorphic(iid) && 1259 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1260 } 1261 1262 bool Method::has_member_arg() const { 1263 vmIntrinsics::ID iid = intrinsic_id(); 1264 return (MethodHandles::is_signature_polymorphic(iid) && 1265 MethodHandles::has_member_arg(iid)); 1266 } 1267 1268 // Make an instance of a signature-polymorphic internal MH primitive. 1269 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1270 Symbol* signature, 1271 TRAPS) { 1272 ResourceMark rm; 1273 methodHandle empty; 1274 1275 InstanceKlass* holder = SystemDictionary::MethodHandle_klass(); 1276 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1277 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1278 if (TraceMethodHandles) { 1279 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1280 } 1281 1282 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1283 name->increment_refcount(); 1284 signature->increment_refcount(); 1285 1286 int cp_length = _imcp_limit; 1287 ClassLoaderData* loader_data = holder->class_loader_data(); 1288 constantPoolHandle cp; 1289 { 1290 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1291 cp = constantPoolHandle(THREAD, cp_oop); 1292 } 1293 cp->set_pool_holder(holder); 1294 cp->symbol_at_put(_imcp_invoke_name, name); 1295 cp->symbol_at_put(_imcp_invoke_signature, signature); 1296 cp->set_has_preresolution(); 1297 1298 // decide on access bits: public or not? 1299 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1300 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1301 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1302 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1303 1304 methodHandle m; 1305 { 1306 InlineTableSizes sizes; 1307 Method* m_oop = Method::allocate(loader_data, 0, 1308 accessFlags_from(flags_bits), &sizes, 1309 ConstMethod::NORMAL, CHECK_(empty)); 1310 m = methodHandle(THREAD, m_oop); 1311 } 1312 m->set_constants(cp()); 1313 m->set_name_index(_imcp_invoke_name); 1314 m->set_signature_index(_imcp_invoke_signature); 1315 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1316 assert(m->signature() == signature, ""); 1317 ResultTypeFinder rtf(signature); 1318 m->constMethod()->set_result_type(rtf.type()); 1319 m->compute_size_of_parameters(THREAD); 1320 m->init_intrinsic_id(); 1321 assert(m->is_method_handle_intrinsic(), ""); 1322 #ifdef ASSERT 1323 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1324 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1325 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1326 #endif //ASSERT 1327 1328 // Finally, set up its entry points. 1329 assert(m->can_be_statically_bound(), ""); 1330 m->set_vtable_index(Method::nonvirtual_vtable_index); 1331 m->link_method(m, CHECK_(empty)); 1332 1333 if (TraceMethodHandles && (Verbose || WizardMode)) { 1334 ttyLocker ttyl; 1335 m->print_on(tty); 1336 } 1337 1338 return m; 1339 } 1340 1341 Klass* Method::check_non_bcp_klass(Klass* klass) { 1342 if (klass != NULL && klass->class_loader() != NULL) { 1343 if (klass->is_objArray_klass()) 1344 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1345 return klass; 1346 } 1347 return NULL; 1348 } 1349 1350 1351 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1352 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1353 // Code below does not work for native methods - they should never get rewritten anyway 1354 assert(!m->is_native(), "cannot rewrite native methods"); 1355 // Allocate new Method* 1356 AccessFlags flags = m->access_flags(); 1357 1358 ConstMethod* cm = m->constMethod(); 1359 int checked_exceptions_len = cm->checked_exceptions_length(); 1360 int localvariable_len = cm->localvariable_table_length(); 1361 int exception_table_len = cm->exception_table_length(); 1362 int method_parameters_len = cm->method_parameters_length(); 1363 int method_annotations_len = cm->method_annotations_length(); 1364 int parameter_annotations_len = cm->parameter_annotations_length(); 1365 int type_annotations_len = cm->type_annotations_length(); 1366 int default_annotations_len = cm->default_annotations_length(); 1367 1368 InlineTableSizes sizes( 1369 localvariable_len, 1370 new_compressed_linenumber_size, 1371 exception_table_len, 1372 checked_exceptions_len, 1373 method_parameters_len, 1374 cm->generic_signature_index(), 1375 method_annotations_len, 1376 parameter_annotations_len, 1377 type_annotations_len, 1378 default_annotations_len, 1379 0); 1380 1381 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1382 Method* newm_oop = Method::allocate(loader_data, 1383 new_code_length, 1384 flags, 1385 &sizes, 1386 m->method_type(), 1387 CHECK_(methodHandle())); 1388 methodHandle newm (THREAD, newm_oop); 1389 1390 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1391 ConstMethod* newcm = newm->constMethod(); 1392 int new_const_method_size = newm->constMethod()->size(); 1393 1394 // This works because the source and target are both Methods. Some compilers 1395 // (e.g., clang) complain that the target vtable pointer will be stomped, 1396 // so cast away newm()'s and m()'s Methodness. 1397 memcpy((void*)newm(), (void*)m(), sizeof(Method)); 1398 1399 // Create shallow copy of ConstMethod. 1400 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1401 1402 // Reset correct method/const method, method size, and parameter info 1403 newm->set_constMethod(newcm); 1404 newm->constMethod()->set_code_size(new_code_length); 1405 newm->constMethod()->set_constMethod_size(new_const_method_size); 1406 assert(newm->code_size() == new_code_length, "check"); 1407 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1408 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1409 assert(newm->exception_table_length() == exception_table_len, "check"); 1410 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1411 // Copy new byte codes 1412 memcpy(newm->code_base(), new_code, new_code_length); 1413 // Copy line number table 1414 if (new_compressed_linenumber_size > 0) { 1415 memcpy(newm->compressed_linenumber_table(), 1416 new_compressed_linenumber_table, 1417 new_compressed_linenumber_size); 1418 } 1419 // Copy method_parameters 1420 if (method_parameters_len > 0) { 1421 memcpy(newm->method_parameters_start(), 1422 m->method_parameters_start(), 1423 method_parameters_len * sizeof(MethodParametersElement)); 1424 } 1425 // Copy checked_exceptions 1426 if (checked_exceptions_len > 0) { 1427 memcpy(newm->checked_exceptions_start(), 1428 m->checked_exceptions_start(), 1429 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1430 } 1431 // Copy exception table 1432 if (exception_table_len > 0) { 1433 memcpy(newm->exception_table_start(), 1434 m->exception_table_start(), 1435 exception_table_len * sizeof(ExceptionTableElement)); 1436 } 1437 // Copy local variable number table 1438 if (localvariable_len > 0) { 1439 memcpy(newm->localvariable_table_start(), 1440 m->localvariable_table_start(), 1441 localvariable_len * sizeof(LocalVariableTableElement)); 1442 } 1443 // Copy stackmap table 1444 if (m->has_stackmap_table()) { 1445 int code_attribute_length = m->stackmap_data()->length(); 1446 Array<u1>* stackmap_data = 1447 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1448 memcpy((void*)stackmap_data->adr_at(0), 1449 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1450 newm->set_stackmap_data(stackmap_data); 1451 } 1452 1453 // copy annotations over to new method 1454 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL); 1455 return newm; 1456 } 1457 1458 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) { 1459 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1460 // because we are not loading from core libraries 1461 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1462 // which does not use the class default class loader so we check for its loader here 1463 const InstanceKlass* ik = InstanceKlass::cast(holder); 1464 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1465 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1466 } 1467 1468 // see if the klass name is well-known: 1469 Symbol* klass_name = ik->name(); 1470 return vmSymbols::find_sid(klass_name); 1471 } 1472 1473 void Method::init_intrinsic_id() { 1474 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1475 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1476 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1477 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1478 1479 // the klass name is well-known: 1480 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1481 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1482 1483 // ditto for method and signature: 1484 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1485 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1486 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1487 && name_id == vmSymbols::NO_SID) { 1488 return; 1489 } 1490 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1491 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1492 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1493 && sig_id == vmSymbols::NO_SID) { 1494 return; 1495 } 1496 jshort flags = access_flags().as_short(); 1497 1498 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1499 if (id != vmIntrinsics::_none) { 1500 set_intrinsic_id(id); 1501 if (id == vmIntrinsics::_Class_cast) { 1502 // Even if the intrinsic is rejected, we want to inline this simple method. 1503 set_force_inline(true); 1504 } 1505 return; 1506 } 1507 1508 // A few slightly irregular cases: 1509 switch (klass_id) { 1510 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1511 // Second chance: check in regular Math. 1512 switch (name_id) { 1513 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1514 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1515 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1516 // pretend it is the corresponding method in the non-strict class: 1517 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1518 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1519 break; 1520 default: 1521 break; 1522 } 1523 break; 1524 1525 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1526 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1527 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1528 if (!is_native()) break; 1529 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1530 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1531 id = vmIntrinsics::_none; 1532 break; 1533 1534 default: 1535 break; 1536 } 1537 1538 if (id != vmIntrinsics::_none) { 1539 // Set up its iid. It is an alias method. 1540 set_intrinsic_id(id); 1541 return; 1542 } 1543 } 1544 1545 // These two methods are static since a GC may move the Method 1546 bool Method::load_signature_classes(methodHandle m, TRAPS) { 1547 if (!THREAD->can_call_java()) { 1548 // There is nothing useful this routine can do from within the Compile thread. 1549 // Hopefully, the signature contains only well-known classes. 1550 // We could scan for this and return true/false, but the caller won't care. 1551 return false; 1552 } 1553 bool sig_is_loaded = true; 1554 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1555 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1556 ResourceMark rm(THREAD); 1557 Symbol* signature = m->signature(); 1558 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1559 if (ss.is_object()) { 1560 Symbol* sym = ss.as_symbol(CHECK_(false)); 1561 Symbol* name = sym; 1562 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1563 protection_domain, THREAD); 1564 // We are loading classes eagerly. If a ClassNotFoundException or 1565 // a LinkageError was generated, be sure to ignore it. 1566 if (HAS_PENDING_EXCEPTION) { 1567 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1568 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1569 CLEAR_PENDING_EXCEPTION; 1570 } else { 1571 return false; 1572 } 1573 } 1574 if( klass == NULL) { sig_is_loaded = false; } 1575 } 1576 } 1577 return sig_is_loaded; 1578 } 1579 1580 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1581 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1582 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1583 ResourceMark rm(THREAD); 1584 Symbol* signature = m->signature(); 1585 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1586 if (ss.type() == T_OBJECT) { 1587 Symbol* name = ss.as_symbol_or_null(); 1588 if (name == NULL) return true; 1589 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1590 if (klass == NULL) return true; 1591 } 1592 } 1593 return false; 1594 } 1595 1596 // Exposed so field engineers can debug VM 1597 void Method::print_short_name(outputStream* st) { 1598 ResourceMark rm; 1599 #ifdef PRODUCT 1600 st->print(" %s::", method_holder()->external_name()); 1601 #else 1602 st->print(" %s::", method_holder()->internal_name()); 1603 #endif 1604 name()->print_symbol_on(st); 1605 if (WizardMode) signature()->print_symbol_on(st); 1606 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1607 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1608 } 1609 1610 // Comparer for sorting an object array containing 1611 // Method*s. 1612 static int method_comparator(Method* a, Method* b) { 1613 return a->name()->fast_compare(b->name()); 1614 } 1615 1616 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1617 // default_methods also uses this without the ordering for fast find_method 1618 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) { 1619 int length = methods->length(); 1620 if (length > 1) { 1621 { 1622 NoSafepointVerifier nsv; 1623 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); 1624 } 1625 // Reset method ordering 1626 if (set_idnums) { 1627 for (int i = 0; i < length; i++) { 1628 Method* m = methods->at(i); 1629 m->set_method_idnum(i); 1630 m->set_orig_method_idnum(i); 1631 } 1632 } 1633 } 1634 } 1635 1636 //----------------------------------------------------------------------------------- 1637 // Non-product code unless JVM/TI needs it 1638 1639 #if !defined(PRODUCT) || INCLUDE_JVMTI 1640 class SignatureTypePrinter : public SignatureTypeNames { 1641 private: 1642 outputStream* _st; 1643 bool _use_separator; 1644 1645 void type_name(const char* name) { 1646 if (_use_separator) _st->print(", "); 1647 _st->print("%s", name); 1648 _use_separator = true; 1649 } 1650 1651 public: 1652 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1653 _st = st; 1654 _use_separator = false; 1655 } 1656 1657 void print_parameters() { _use_separator = false; iterate_parameters(); } 1658 void print_returntype() { _use_separator = false; iterate_returntype(); } 1659 }; 1660 1661 1662 void Method::print_name(outputStream* st) { 1663 Thread *thread = Thread::current(); 1664 ResourceMark rm(thread); 1665 st->print("%s ", is_static() ? "static" : "virtual"); 1666 if (WizardMode) { 1667 st->print("%s.", method_holder()->internal_name()); 1668 name()->print_symbol_on(st); 1669 signature()->print_symbol_on(st); 1670 } else { 1671 SignatureTypePrinter sig(signature(), st); 1672 sig.print_returntype(); 1673 st->print(" %s.", method_holder()->internal_name()); 1674 name()->print_symbol_on(st); 1675 st->print("("); 1676 sig.print_parameters(); 1677 st->print(")"); 1678 } 1679 } 1680 #endif // !PRODUCT || INCLUDE_JVMTI 1681 1682 1683 void Method::print_codes_on(outputStream* st) const { 1684 print_codes_on(0, code_size(), st); 1685 } 1686 1687 void Method::print_codes_on(int from, int to, outputStream* st) const { 1688 Thread *thread = Thread::current(); 1689 ResourceMark rm(thread); 1690 methodHandle mh (thread, (Method*)this); 1691 BytecodeStream s(mh); 1692 s.set_interval(from, to); 1693 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1694 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1695 } 1696 1697 1698 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1699 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1700 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1701 // as end-of-stream terminator. 1702 1703 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1704 // bci and line number does not compress into single byte. 1705 // Write out escape character and use regular compression for bci and line number. 1706 write_byte((jubyte)0xFF); 1707 write_signed_int(bci_delta); 1708 write_signed_int(line_delta); 1709 } 1710 1711 // See comment in method.hpp which explains why this exists. 1712 #if defined(_M_AMD64) && _MSC_VER >= 1400 1713 #pragma optimize("", off) 1714 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1715 write_pair_inline(bci, line); 1716 } 1717 #pragma optimize("", on) 1718 #endif 1719 1720 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1721 _bci = 0; 1722 _line = 0; 1723 }; 1724 1725 1726 bool CompressedLineNumberReadStream::read_pair() { 1727 jubyte next = read_byte(); 1728 // Check for terminator 1729 if (next == 0) return false; 1730 if (next == 0xFF) { 1731 // Escape character, regular compression used 1732 _bci += read_signed_int(); 1733 _line += read_signed_int(); 1734 } else { 1735 // Single byte compression used 1736 _bci += next >> 3; 1737 _line += next & 0x7; 1738 } 1739 return true; 1740 } 1741 1742 #if INCLUDE_JVMTI 1743 1744 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1745 BreakpointInfo* bp = method_holder()->breakpoints(); 1746 for (; bp != NULL; bp = bp->next()) { 1747 if (bp->match(this, bci)) { 1748 return bp->orig_bytecode(); 1749 } 1750 } 1751 { 1752 ResourceMark rm; 1753 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1754 } 1755 return Bytecodes::_shouldnotreachhere; 1756 } 1757 1758 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1759 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1760 BreakpointInfo* bp = method_holder()->breakpoints(); 1761 for (; bp != NULL; bp = bp->next()) { 1762 if (bp->match(this, bci)) { 1763 bp->set_orig_bytecode(code); 1764 // and continue, in case there is more than one 1765 } 1766 } 1767 } 1768 1769 void Method::set_breakpoint(int bci) { 1770 InstanceKlass* ik = method_holder(); 1771 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1772 bp->set_next(ik->breakpoints()); 1773 ik->set_breakpoints(bp); 1774 // do this last: 1775 bp->set(this); 1776 } 1777 1778 static void clear_matches(Method* m, int bci) { 1779 InstanceKlass* ik = m->method_holder(); 1780 BreakpointInfo* prev_bp = NULL; 1781 BreakpointInfo* next_bp; 1782 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1783 next_bp = bp->next(); 1784 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1785 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1786 // do this first: 1787 bp->clear(m); 1788 // unhook it 1789 if (prev_bp != NULL) 1790 prev_bp->set_next(next_bp); 1791 else 1792 ik->set_breakpoints(next_bp); 1793 delete bp; 1794 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1795 // at same location. So we have multiple matching (method_index and bci) 1796 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1797 // breakpoint for clear_breakpoint request and keep all other method versions 1798 // BreakpointInfo for future clear_breakpoint request. 1799 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1800 // which is being called when class is unloaded. We delete all the Breakpoint 1801 // information for all versions of method. We may not correctly restore the original 1802 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1803 // so these methods won't be used anymore. 1804 if (bci >= 0) { 1805 break; 1806 } 1807 } else { 1808 // This one is a keeper. 1809 prev_bp = bp; 1810 } 1811 } 1812 } 1813 1814 void Method::clear_breakpoint(int bci) { 1815 assert(bci >= 0, ""); 1816 clear_matches(this, bci); 1817 } 1818 1819 void Method::clear_all_breakpoints() { 1820 clear_matches(this, -1); 1821 } 1822 1823 #endif // INCLUDE_JVMTI 1824 1825 int Method::invocation_count() { 1826 MethodCounters *mcs = method_counters(); 1827 if (TieredCompilation) { 1828 MethodData* const mdo = method_data(); 1829 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1830 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1831 return InvocationCounter::count_limit; 1832 } else { 1833 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1834 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1835 } 1836 } else { 1837 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1838 } 1839 } 1840 1841 int Method::backedge_count() { 1842 MethodCounters *mcs = method_counters(); 1843 if (TieredCompilation) { 1844 MethodData* const mdo = method_data(); 1845 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1846 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1847 return InvocationCounter::count_limit; 1848 } else { 1849 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1850 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1851 } 1852 } else { 1853 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1854 } 1855 } 1856 1857 int Method::highest_comp_level() const { 1858 const MethodCounters* mcs = method_counters(); 1859 if (mcs != NULL) { 1860 return mcs->highest_comp_level(); 1861 } else { 1862 return CompLevel_none; 1863 } 1864 } 1865 1866 int Method::highest_osr_comp_level() const { 1867 const MethodCounters* mcs = method_counters(); 1868 if (mcs != NULL) { 1869 return mcs->highest_osr_comp_level(); 1870 } else { 1871 return CompLevel_none; 1872 } 1873 } 1874 1875 void Method::set_highest_comp_level(int level) { 1876 MethodCounters* mcs = method_counters(); 1877 if (mcs != NULL) { 1878 mcs->set_highest_comp_level(level); 1879 } 1880 } 1881 1882 void Method::set_highest_osr_comp_level(int level) { 1883 MethodCounters* mcs = method_counters(); 1884 if (mcs != NULL) { 1885 mcs->set_highest_osr_comp_level(level); 1886 } 1887 } 1888 1889 #if INCLUDE_JVMTI 1890 1891 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1892 _bci = bci; 1893 _name_index = m->name_index(); 1894 _signature_index = m->signature_index(); 1895 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1896 if (_orig_bytecode == Bytecodes::_breakpoint) 1897 _orig_bytecode = m->orig_bytecode_at(_bci); 1898 _next = NULL; 1899 } 1900 1901 void BreakpointInfo::set(Method* method) { 1902 #ifdef ASSERT 1903 { 1904 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1905 if (code == Bytecodes::_breakpoint) 1906 code = method->orig_bytecode_at(_bci); 1907 assert(orig_bytecode() == code, "original bytecode must be the same"); 1908 } 1909 #endif 1910 Thread *thread = Thread::current(); 1911 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1912 method->incr_number_of_breakpoints(thread); 1913 SystemDictionary::notice_modification(); 1914 { 1915 // Deoptimize all dependents on this method 1916 HandleMark hm(thread); 1917 methodHandle mh(thread, method); 1918 CodeCache::flush_dependents_on_method(mh); 1919 } 1920 } 1921 1922 void BreakpointInfo::clear(Method* method) { 1923 *method->bcp_from(_bci) = orig_bytecode(); 1924 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1925 method->decr_number_of_breakpoints(Thread::current()); 1926 } 1927 1928 #endif // INCLUDE_JVMTI 1929 1930 // jmethodID handling 1931 1932 // This is a block allocating object, sort of like JNIHandleBlock, only a 1933 // lot simpler. 1934 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1935 // never get rid of it. 1936 1937 static const int min_block_size = 8; 1938 1939 class JNIMethodBlockNode : public CHeapObj<mtClass> { 1940 friend class JNIMethodBlock; 1941 Method** _methods; 1942 int _number_of_methods; 1943 int _top; 1944 JNIMethodBlockNode* _next; 1945 1946 public: 1947 1948 JNIMethodBlockNode(int num_methods = min_block_size); 1949 1950 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 1951 1952 void ensure_methods(int num_addl_methods) { 1953 if (_top < _number_of_methods) { 1954 num_addl_methods -= _number_of_methods - _top; 1955 if (num_addl_methods <= 0) { 1956 return; 1957 } 1958 } 1959 if (_next == NULL) { 1960 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 1961 } else { 1962 _next->ensure_methods(num_addl_methods); 1963 } 1964 } 1965 }; 1966 1967 class JNIMethodBlock : public CHeapObj<mtClass> { 1968 JNIMethodBlockNode _head; 1969 JNIMethodBlockNode *_last_free; 1970 public: 1971 static Method* const _free_method; 1972 1973 JNIMethodBlock(int initial_capacity = min_block_size) 1974 : _head(initial_capacity), _last_free(&_head) {} 1975 1976 void ensure_methods(int num_addl_methods) { 1977 _last_free->ensure_methods(num_addl_methods); 1978 } 1979 1980 Method** add_method(Method* m) { 1981 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) { 1982 if (b->_top < b->_number_of_methods) { 1983 // top points to the next free entry. 1984 int i = b->_top; 1985 b->_methods[i] = m; 1986 b->_top++; 1987 _last_free = b; 1988 return &(b->_methods[i]); 1989 } else if (b->_top == b->_number_of_methods) { 1990 // if the next free entry ran off the block see if there's a free entry 1991 for (int i = 0; i < b->_number_of_methods; i++) { 1992 if (b->_methods[i] == _free_method) { 1993 b->_methods[i] = m; 1994 _last_free = b; 1995 return &(b->_methods[i]); 1996 } 1997 } 1998 // Only check each block once for frees. They're very unlikely. 1999 // Increment top past the end of the block. 2000 b->_top++; 2001 } 2002 // need to allocate a next block. 2003 if (b->_next == NULL) { 2004 b->_next = _last_free = new JNIMethodBlockNode(); 2005 } 2006 } 2007 guarantee(false, "Should always allocate a free block"); 2008 return NULL; 2009 } 2010 2011 bool contains(Method** m) { 2012 if (m == NULL) return false; 2013 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2014 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2015 // This is a bit of extra checking, for two reasons. One is 2016 // that contains() deals with pointers that are passed in by 2017 // JNI code, so making sure that the pointer is aligned 2018 // correctly is valuable. The other is that <= and > are 2019 // technically not defined on pointers, so the if guard can 2020 // pass spuriously; no modern compiler is likely to make that 2021 // a problem, though (and if one did, the guard could also 2022 // fail spuriously, which would be bad). 2023 ptrdiff_t idx = m - b->_methods; 2024 if (b->_methods + idx == m) { 2025 return true; 2026 } 2027 } 2028 } 2029 return false; // not found 2030 } 2031 2032 // Doesn't really destroy it, just marks it as free so it can be reused. 2033 void destroy_method(Method** m) { 2034 #ifdef ASSERT 2035 assert(contains(m), "should be a methodID"); 2036 #endif // ASSERT 2037 *m = _free_method; 2038 } 2039 2040 // During class unloading the methods are cleared, which is different 2041 // than freed. 2042 void clear_all_methods() { 2043 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2044 for (int i = 0; i< b->_number_of_methods; i++) { 2045 b->_methods[i] = NULL; 2046 } 2047 } 2048 } 2049 #ifndef PRODUCT 2050 int count_methods() { 2051 // count all allocated methods 2052 int count = 0; 2053 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2054 for (int i = 0; i< b->_number_of_methods; i++) { 2055 if (b->_methods[i] != _free_method) count++; 2056 } 2057 } 2058 return count; 2059 } 2060 #endif // PRODUCT 2061 }; 2062 2063 // Something that can't be mistaken for an address or a markOop 2064 Method* const JNIMethodBlock::_free_method = (Method*)55; 2065 2066 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) { 2067 _number_of_methods = MAX2(num_methods, min_block_size); 2068 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2069 for (int i = 0; i < _number_of_methods; i++) { 2070 _methods[i] = JNIMethodBlock::_free_method; 2071 } 2072 } 2073 2074 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) { 2075 ClassLoaderData* cld = loader_data; 2076 if (!SafepointSynchronize::is_at_safepoint()) { 2077 // Have to add jmethod_ids() to class loader data thread-safely. 2078 // Also have to add the method to the list safely, which the cld lock 2079 // protects as well. 2080 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2081 if (cld->jmethod_ids() == NULL) { 2082 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2083 } else { 2084 cld->jmethod_ids()->ensure_methods(capacity); 2085 } 2086 } else { 2087 // At safepoint, we are single threaded and can set this. 2088 if (cld->jmethod_ids() == NULL) { 2089 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2090 } else { 2091 cld->jmethod_ids()->ensure_methods(capacity); 2092 } 2093 } 2094 } 2095 2096 // Add a method id to the jmethod_ids 2097 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 2098 ClassLoaderData* cld = loader_data; 2099 2100 if (!SafepointSynchronize::is_at_safepoint()) { 2101 // Have to add jmethod_ids() to class loader data thread-safely. 2102 // Also have to add the method to the list safely, which the cld lock 2103 // protects as well. 2104 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2105 if (cld->jmethod_ids() == NULL) { 2106 cld->set_jmethod_ids(new JNIMethodBlock()); 2107 } 2108 // jmethodID is a pointer to Method* 2109 return (jmethodID)cld->jmethod_ids()->add_method(m); 2110 } else { 2111 // At safepoint, we are single threaded and can set this. 2112 if (cld->jmethod_ids() == NULL) { 2113 cld->set_jmethod_ids(new JNIMethodBlock()); 2114 } 2115 // jmethodID is a pointer to Method* 2116 return (jmethodID)cld->jmethod_ids()->add_method(m); 2117 } 2118 } 2119 2120 // Mark a jmethodID as free. This is called when there is a data race in 2121 // InstanceKlass while creating the jmethodID cache. 2122 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 2123 ClassLoaderData* cld = loader_data; 2124 Method** ptr = (Method**)m; 2125 assert(cld->jmethod_ids() != NULL, "should have method handles"); 2126 cld->jmethod_ids()->destroy_method(ptr); 2127 } 2128 2129 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2130 // Can't assert the method_holder is the same because the new method has the 2131 // scratch method holder. 2132 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2133 == new_method->method_holder()->class_loader(), 2134 "changing to a different class loader"); 2135 // Just change the method in place, jmethodID pointer doesn't change. 2136 *((Method**)jmid) = new_method; 2137 } 2138 2139 bool Method::is_method_id(jmethodID mid) { 2140 Method* m = resolve_jmethod_id(mid); 2141 assert(m != NULL, "should be called with non-null method"); 2142 InstanceKlass* ik = m->method_holder(); 2143 ClassLoaderData* cld = ik->class_loader_data(); 2144 if (cld->jmethod_ids() == NULL) return false; 2145 return (cld->jmethod_ids()->contains((Method**)mid)); 2146 } 2147 2148 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2149 if (mid == NULL) return NULL; 2150 Method* o = resolve_jmethod_id(mid); 2151 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 2152 return NULL; 2153 } 2154 return o; 2155 }; 2156 2157 void Method::set_on_stack(const bool value) { 2158 // Set both the method itself and its constant pool. The constant pool 2159 // on stack means some method referring to it is also on the stack. 2160 constants()->set_on_stack(value); 2161 2162 bool already_set = on_stack(); 2163 _access_flags.set_on_stack(value); 2164 if (value && !already_set) { 2165 MetadataOnStackMark::record(this); 2166 } 2167 } 2168 2169 // Called when the class loader is unloaded to make all methods weak. 2170 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2171 loader_data->jmethod_ids()->clear_all_methods(); 2172 } 2173 2174 bool Method::has_method_vptr(const void* ptr) { 2175 Method m; 2176 // This assumes that the vtbl pointer is the first word of a C++ object. 2177 return dereference_vptr(&m) == dereference_vptr(ptr); 2178 } 2179 2180 // Check that this pointer is valid by checking that the vtbl pointer matches 2181 bool Method::is_valid_method() const { 2182 if (this == NULL) { 2183 return false; 2184 } else if ((intptr_t(this) & (wordSize-1)) != 0) { 2185 // Quick sanity check on pointer. 2186 return false; 2187 } else if (MetaspaceShared::is_in_shared_space(this)) { 2188 return MetaspaceShared::is_valid_shared_method(this); 2189 } else if (Metaspace::contains_non_shared(this)) { 2190 return has_method_vptr((const void*)this); 2191 } else { 2192 return false; 2193 } 2194 } 2195 2196 #ifndef PRODUCT 2197 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 2198 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 2199 } 2200 #endif // PRODUCT 2201 2202 2203 // Printing 2204 2205 #ifndef PRODUCT 2206 2207 void Method::print_on(outputStream* st) const { 2208 ResourceMark rm; 2209 assert(is_method(), "must be method"); 2210 st->print_cr("%s", internal_name()); 2211 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this)); 2212 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2213 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants())); 2214 constants()->print_value_on(st); st->cr(); 2215 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2216 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2217 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2218 st->print_cr(" - max stack: %d", max_stack()); 2219 st->print_cr(" - max locals: %d", max_locals()); 2220 st->print_cr(" - size of params: %d", size_of_parameters()); 2221 st->print_cr(" - method size: %d", method_size()); 2222 if (intrinsic_id() != vmIntrinsics::_none) 2223 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 2224 if (highest_comp_level() != CompLevel_none) 2225 st->print_cr(" - highest level: %d", highest_comp_level()); 2226 st->print_cr(" - vtable index: %d", _vtable_index); 2227 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry())); 2228 st->print( " - adapters: "); 2229 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2230 if (a == NULL) 2231 st->print_cr(INTPTR_FORMAT, p2i(a)); 2232 else 2233 a->print_adapter_on(st); 2234 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry())); 2235 st->print_cr(" - code size: %d", code_size()); 2236 if (code_size() != 0) { 2237 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base())); 2238 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size())); 2239 } 2240 if (method_data() != NULL) { 2241 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data())); 2242 } 2243 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2244 if (checked_exceptions_length() > 0) { 2245 CheckedExceptionElement* table = checked_exceptions_start(); 2246 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table)); 2247 if (Verbose) { 2248 for (int i = 0; i < checked_exceptions_length(); i++) { 2249 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2250 } 2251 } 2252 } 2253 if (has_linenumber_table()) { 2254 u_char* table = compressed_linenumber_table(); 2255 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table)); 2256 if (Verbose) { 2257 CompressedLineNumberReadStream stream(table); 2258 while (stream.read_pair()) { 2259 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2260 } 2261 } 2262 } 2263 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2264 if (localvariable_table_length() > 0) { 2265 LocalVariableTableElement* table = localvariable_table_start(); 2266 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table)); 2267 if (Verbose) { 2268 for (int i = 0; i < localvariable_table_length(); i++) { 2269 int bci = table[i].start_bci; 2270 int len = table[i].length; 2271 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2272 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2273 int slot = table[i].slot; 2274 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2275 } 2276 } 2277 } 2278 if (code() != NULL) { 2279 st->print (" - compiled code: "); 2280 code()->print_value_on(st); 2281 } 2282 if (is_native()) { 2283 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function())); 2284 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler())); 2285 } 2286 } 2287 2288 void Method::print_linkage_flags(outputStream* st) { 2289 access_flags().print_on(st); 2290 if (is_default_method()) { 2291 st->print("default "); 2292 } 2293 if (is_overpass()) { 2294 st->print("overpass "); 2295 } 2296 } 2297 #endif //PRODUCT 2298 2299 void Method::print_value_on(outputStream* st) const { 2300 assert(is_method(), "must be method"); 2301 st->print("%s", internal_name()); 2302 print_address_on(st); 2303 st->print(" "); 2304 name()->print_value_on(st); 2305 st->print(" "); 2306 signature()->print_value_on(st); 2307 st->print(" in "); 2308 method_holder()->print_value_on(st); 2309 if (WizardMode) st->print("#%d", _vtable_index); 2310 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2311 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2312 } 2313 2314 #if INCLUDE_SERVICES 2315 // Size Statistics 2316 void Method::collect_statistics(KlassSizeStats *sz) const { 2317 int mysize = sz->count(this); 2318 sz->_method_bytes += mysize; 2319 sz->_method_all_bytes += mysize; 2320 sz->_rw_bytes += mysize; 2321 2322 if (constMethod()) { 2323 constMethod()->collect_statistics(sz); 2324 } 2325 if (method_data()) { 2326 method_data()->collect_statistics(sz); 2327 } 2328 } 2329 #endif // INCLUDE_SERVICES 2330 2331 // LogTouchedMethods and PrintTouchedMethods 2332 2333 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because 2334 // the Method may be garbage collected. Let's roll our own hash table. 2335 class TouchedMethodRecord : CHeapObj<mtTracing> { 2336 public: 2337 // It's OK to store Symbols here because they will NOT be GC'ed if 2338 // LogTouchedMethods is enabled. 2339 TouchedMethodRecord* _next; 2340 Symbol* _class_name; 2341 Symbol* _method_name; 2342 Symbol* _method_signature; 2343 }; 2344 2345 static const int TOUCHED_METHOD_TABLE_SIZE = 20011; 2346 static TouchedMethodRecord** _touched_method_table = NULL; 2347 2348 void Method::log_touched(TRAPS) { 2349 2350 const int table_size = TOUCHED_METHOD_TABLE_SIZE; 2351 Symbol* my_class = klass_name(); 2352 Symbol* my_name = name(); 2353 Symbol* my_sig = signature(); 2354 2355 unsigned int hash = my_class->identity_hash() + 2356 my_name->identity_hash() + 2357 my_sig->identity_hash(); 2358 juint index = juint(hash) % table_size; 2359 2360 MutexLocker ml(TouchedMethodLog_lock, THREAD); 2361 if (_touched_method_table == NULL) { 2362 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size, 2363 mtTracing, CURRENT_PC); 2364 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size); 2365 } 2366 2367 TouchedMethodRecord* ptr = _touched_method_table[index]; 2368 while (ptr) { 2369 if (ptr->_class_name == my_class && 2370 ptr->_method_name == my_name && 2371 ptr->_method_signature == my_sig) { 2372 return; 2373 } 2374 if (ptr->_next == NULL) break; 2375 ptr = ptr->_next; 2376 } 2377 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing); 2378 my_class->set_permanent(); // prevent reclaimed by GC 2379 my_name->set_permanent(); 2380 my_sig->set_permanent(); 2381 nptr->_class_name = my_class; 2382 nptr->_method_name = my_name; 2383 nptr->_method_signature = my_sig; 2384 nptr->_next = NULL; 2385 2386 if (ptr == NULL) { 2387 // first 2388 _touched_method_table[index] = nptr; 2389 } else { 2390 ptr->_next = nptr; 2391 } 2392 } 2393 2394 void Method::print_touched_methods(outputStream* out) { 2395 MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock); 2396 out->print_cr("# Method::print_touched_methods version 1"); 2397 if (_touched_method_table) { 2398 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) { 2399 TouchedMethodRecord* ptr = _touched_method_table[i]; 2400 while(ptr) { 2401 ptr->_class_name->print_symbol_on(out); out->print("."); 2402 ptr->_method_name->print_symbol_on(out); out->print(":"); 2403 ptr->_method_signature->print_symbol_on(out); out->cr(); 2404 ptr = ptr->_next; 2405 } 2406 } 2407 } 2408 } 2409 2410 // Verification 2411 2412 void Method::verify_on(outputStream* st) { 2413 guarantee(is_method(), "object must be method"); 2414 guarantee(constants()->is_constantPool(), "should be constant pool"); 2415 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 2416 MethodData* md = method_data(); 2417 guarantee(md == NULL || 2418 md->is_methodData(), "should be method data"); 2419 }