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 } 553 _access_flags.set_loops_flag_init(); 554 return _access_flags.has_loops(); 555 } 556 557 bool Method::is_final_method(AccessFlags class_access_flags) const { 558 // or "does_not_require_vtable_entry" 559 // default method or overpass can occur, is not final (reuses vtable entry) 560 // private methods in classes get vtable entries for backward class compatibility. 561 if (is_overpass() || is_default_method()) return false; 562 return is_final() || class_access_flags.is_final(); 563 } 564 565 bool Method::is_final_method() const { 566 return is_final_method(method_holder()->access_flags()); 567 } 568 569 bool Method::is_default_method() const { 570 if (method_holder() != NULL && 571 method_holder()->is_interface() && 572 !is_abstract() && !is_private()) { 573 return true; 574 } else { 575 return false; 576 } 577 } 578 579 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 580 if (is_final_method(class_access_flags)) return true; 581 #ifdef ASSERT 582 ResourceMark rm; 583 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 584 if (class_access_flags.is_interface()) { 585 assert(is_nonv == is_static() || is_nonv == is_private(), 586 "nonvirtual unexpected for non-static, non-private: %s", 587 name_and_sig_as_C_string()); 588 } 589 #endif 590 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 591 return vtable_index() == nonvirtual_vtable_index; 592 } 593 594 bool Method::can_be_statically_bound() const { 595 return can_be_statically_bound(method_holder()->access_flags()); 596 } 597 598 bool Method::is_accessor() const { 599 return is_getter() || is_setter(); 600 } 601 602 bool Method::is_getter() const { 603 if (code_size() != 5) return false; 604 if (size_of_parameters() != 1) return false; 605 if (java_code_at(0) != Bytecodes::_aload_0) return false; 606 if (java_code_at(1) != Bytecodes::_getfield) return false; 607 switch (java_code_at(4)) { 608 case Bytecodes::_ireturn: 609 case Bytecodes::_lreturn: 610 case Bytecodes::_freturn: 611 case Bytecodes::_dreturn: 612 case Bytecodes::_areturn: 613 break; 614 default: 615 return false; 616 } 617 return true; 618 } 619 620 bool Method::is_setter() const { 621 if (code_size() != 6) return false; 622 if (java_code_at(0) != Bytecodes::_aload_0) return false; 623 switch (java_code_at(1)) { 624 case Bytecodes::_iload_1: 625 case Bytecodes::_aload_1: 626 case Bytecodes::_fload_1: 627 if (size_of_parameters() != 2) return false; 628 break; 629 case Bytecodes::_dload_1: 630 case Bytecodes::_lload_1: 631 if (size_of_parameters() != 3) return false; 632 break; 633 default: 634 return false; 635 } 636 if (java_code_at(2) != Bytecodes::_putfield) return false; 637 if (java_code_at(5) != Bytecodes::_return) return false; 638 return true; 639 } 640 641 bool Method::is_constant_getter() const { 642 int last_index = code_size() - 1; 643 // Check if the first 1-3 bytecodes are a constant push 644 // and the last bytecode is a return. 645 return (2 <= code_size() && code_size() <= 4 && 646 Bytecodes::is_const(java_code_at(0)) && 647 Bytecodes::length_for(java_code_at(0)) == last_index && 648 Bytecodes::is_return(java_code_at(last_index))); 649 } 650 651 bool Method::is_initializer() const { 652 return is_object_initializer() || is_static_initializer(); 653 } 654 655 bool Method::has_valid_initializer_flags() const { 656 return (is_static() || 657 method_holder()->major_version() < 51); 658 } 659 660 bool Method::is_static_initializer() const { 661 // For classfiles version 51 or greater, ensure that the clinit method is 662 // static. Non-static methods with the name "<clinit>" are not static 663 // initializers. (older classfiles exempted for backward compatibility) 664 return name() == vmSymbols::class_initializer_name() && 665 has_valid_initializer_flags(); 666 } 667 668 bool Method::is_object_initializer() const { 669 return name() == vmSymbols::object_initializer_name(); 670 } 671 672 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 673 int length = method->checked_exceptions_length(); 674 if (length == 0) { // common case 675 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 676 } else { 677 methodHandle h_this(THREAD, method); 678 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 679 objArrayHandle mirrors (THREAD, m_oop); 680 for (int i = 0; i < length; i++) { 681 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 682 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 683 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 684 mirrors->obj_at_put(i, k->java_mirror()); 685 } 686 return mirrors; 687 } 688 }; 689 690 691 int Method::line_number_from_bci(int bci) const { 692 if (bci == SynchronizationEntryBCI) bci = 0; 693 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 694 int best_bci = 0; 695 int best_line = -1; 696 697 if (has_linenumber_table()) { 698 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 699 // Not necessarily sorted and not necessarily one-to-one. 700 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 701 while (stream.read_pair()) { 702 if (stream.bci() == bci) { 703 // perfect match 704 return stream.line(); 705 } else { 706 // update best_bci/line 707 if (stream.bci() < bci && stream.bci() >= best_bci) { 708 best_bci = stream.bci(); 709 best_line = stream.line(); 710 } 711 } 712 } 713 } 714 return best_line; 715 } 716 717 718 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 719 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 720 Thread *thread = Thread::current(); 721 Symbol* klass_name = constants()->klass_name_at(klass_index); 722 Handle loader(thread, method_holder()->class_loader()); 723 Handle prot (thread, method_holder()->protection_domain()); 724 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 725 } else { 726 return true; 727 } 728 } 729 730 731 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 732 int klass_index = constants()->klass_ref_index_at(refinfo_index); 733 if (must_be_resolved) { 734 // Make sure klass is resolved in constantpool. 735 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 736 } 737 return is_klass_loaded_by_klass_index(klass_index); 738 } 739 740 741 void Method::set_native_function(address function, bool post_event_flag) { 742 assert(function != NULL, "use clear_native_function to unregister natives"); 743 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 744 address* native_function = native_function_addr(); 745 746 // We can see racers trying to place the same native function into place. Once 747 // is plenty. 748 address current = *native_function; 749 if (current == function) return; 750 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 751 function != NULL) { 752 // native_method_throw_unsatisfied_link_error_entry() should only 753 // be passed when post_event_flag is false. 754 assert(function != 755 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 756 "post_event_flag mis-match"); 757 758 // post the bind event, and possible change the bind function 759 JvmtiExport::post_native_method_bind(this, &function); 760 } 761 *native_function = function; 762 // This function can be called more than once. We must make sure that we always 763 // use the latest registered method -> check if a stub already has been generated. 764 // If so, we have to make it not_entrant. 765 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates 766 if (nm != NULL) { 767 nm->make_not_entrant(); 768 } 769 } 770 771 772 bool Method::has_native_function() const { 773 if (is_method_handle_intrinsic()) 774 return false; // special-cased in SharedRuntime::generate_native_wrapper 775 address func = native_function(); 776 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 777 } 778 779 780 void Method::clear_native_function() { 781 // Note: is_method_handle_intrinsic() is allowed here. 782 set_native_function( 783 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 784 !native_bind_event_is_interesting); 785 clear_code(); 786 } 787 788 address Method::critical_native_function() { 789 methodHandle mh(this); 790 return NativeLookup::lookup_critical_entry(mh); 791 } 792 793 794 void Method::set_signature_handler(address handler) { 795 address* signature_handler = signature_handler_addr(); 796 *signature_handler = handler; 797 } 798 799 800 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 801 if (PrintCompilation && report) { 802 ttyLocker ttyl; 803 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 804 if (comp_level == CompLevel_all) { 805 tty->print("all levels "); 806 } else { 807 tty->print("levels "); 808 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 809 tty->print("%d ", i); 810 } 811 } 812 this->print_short_name(tty); 813 int size = this->code_size(); 814 if (size > 0) { 815 tty->print(" (%d bytes)", size); 816 } 817 if (reason != NULL) { 818 tty->print(" %s", reason); 819 } 820 tty->cr(); 821 } 822 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 823 ttyLocker ttyl; 824 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 825 os::current_thread_id(), is_osr, comp_level); 826 if (reason != NULL) { 827 xtty->print(" reason=\'%s\'", reason); 828 } 829 xtty->method(this); 830 xtty->stamp(); 831 xtty->end_elem(); 832 } 833 } 834 835 bool Method::is_always_compilable() const { 836 // Generated adapters must be compiled 837 if (is_method_handle_intrinsic() && is_synthetic()) { 838 assert(!is_not_c1_compilable(), "sanity check"); 839 assert(!is_not_c2_compilable(), "sanity check"); 840 return true; 841 } 842 843 return false; 844 } 845 846 bool Method::is_not_compilable(int comp_level) const { 847 if (number_of_breakpoints() > 0) 848 return true; 849 if (is_always_compilable()) 850 return false; 851 if (comp_level == CompLevel_any) 852 return is_not_c1_compilable() || is_not_c2_compilable(); 853 if (is_c1_compile(comp_level)) 854 return is_not_c1_compilable(); 855 if (is_c2_compile(comp_level)) 856 return is_not_c2_compilable(); 857 return false; 858 } 859 860 // call this when compiler finds that this method is not compilable 861 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 862 if (is_always_compilable()) { 863 // Don't mark a method which should be always compilable 864 return; 865 } 866 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 867 if (comp_level == CompLevel_all) { 868 set_not_c1_compilable(); 869 set_not_c2_compilable(); 870 } else { 871 if (is_c1_compile(comp_level)) 872 set_not_c1_compilable(); 873 if (is_c2_compile(comp_level)) 874 set_not_c2_compilable(); 875 } 876 CompilationPolicy::policy()->disable_compilation(this); 877 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 878 } 879 880 bool Method::is_not_osr_compilable(int comp_level) const { 881 if (is_not_compilable(comp_level)) 882 return true; 883 if (comp_level == CompLevel_any) 884 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 885 if (is_c1_compile(comp_level)) 886 return is_not_c1_osr_compilable(); 887 if (is_c2_compile(comp_level)) 888 return is_not_c2_osr_compilable(); 889 return false; 890 } 891 892 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 893 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 894 if (comp_level == CompLevel_all) { 895 set_not_c1_osr_compilable(); 896 set_not_c2_osr_compilable(); 897 } else { 898 if (is_c1_compile(comp_level)) 899 set_not_c1_osr_compilable(); 900 if (is_c2_compile(comp_level)) 901 set_not_c2_osr_compilable(); 902 } 903 CompilationPolicy::policy()->disable_compilation(this); 904 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 905 } 906 907 // Revert to using the interpreter and clear out the nmethod 908 void Method::clear_code(bool acquire_lock /* = true */) { 909 MutexLockerEx pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag); 910 // this may be NULL if c2i adapters have not been made yet 911 // Only should happen at allocate time. 912 if (adapter() == NULL) { 913 _from_compiled_entry = NULL; 914 } else { 915 _from_compiled_entry = adapter()->get_c2i_entry(); 916 } 917 OrderAccess::storestore(); 918 _from_interpreted_entry = _i2i_entry; 919 OrderAccess::storestore(); 920 _code = NULL; 921 } 922 923 #if INCLUDE_CDS 924 // Called by class data sharing to remove any entry points (which are not shared) 925 void Method::unlink_method() { 926 _code = NULL; 927 928 assert(DumpSharedSpaces, "dump time only"); 929 // Set the values to what they should be at run time. Note that 930 // this Method can no longer be executed during dump time. 931 _i2i_entry = Interpreter::entry_for_cds_method(this); 932 _from_interpreted_entry = _i2i_entry; 933 934 if (is_native()) { 935 *native_function_addr() = NULL; 936 set_signature_handler(NULL); 937 } 938 NOT_PRODUCT(set_compiled_invocation_count(0);) 939 940 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter(); 941 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline()); 942 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline(); 943 assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time"); 944 945 946 // In case of DumpSharedSpaces, _method_data should always be NULL. 947 assert(_method_data == NULL, "unexpected method data?"); 948 949 set_method_data(NULL); 950 clear_method_counters(); 951 } 952 #endif 953 954 /**************************************************************************** 955 // The following illustrates how the entries work for CDS shared Methods: 956 // 957 // Our goal is to delay writing into a shared Method until it's compiled. 958 // Hence, we want to determine the initial values for _i2i_entry, 959 // _from_interpreted_entry and _from_compiled_entry during CDS dump time. 960 // 961 // In this example, both Methods A and B have the _i2i_entry of "zero_locals". 962 // They also have similar signatures so that they will share the same 963 // AdapterHandlerEntry. 964 // 965 // _adapter_trampoline points to a fixed location in the RW section of 966 // the CDS archive. This location initially contains a NULL pointer. When the 967 // first of method A or B is linked, an AdapterHandlerEntry is allocated 968 // dynamically, and its c2i/i2c entries are generated. 969 // 970 // _i2i_entry and _from_interpreted_entry initially points to the same 971 // (fixed) location in the CODE section of the CDS archive. This contains 972 // an unconditional branch to the actual entry for "zero_locals", which is 973 // generated at run time and may be on an arbitrary address. Thus, the 974 // unconditional branch is also generated at run time to jump to the correct 975 // address. 976 // 977 // Similarly, _from_compiled_entry points to a fixed address in the CODE 978 // section. This address has enough space for an unconditional branch 979 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is 980 // initialized, and the address for the actual c2i_entry is known, we emit a 981 // branch instruction here to branch to the actual c2i_entry. 982 // 983 // The effect of the extra branch on the i2i and c2i entries is negligible. 984 // 985 // The reason for putting _adapter_trampoline in RO is many shared Methods 986 // share the same AdapterHandlerEntry, so we can save space in the RW section 987 // by having the extra indirection. 988 989 990 [Method A: RW] 991 _constMethod ----> [ConstMethod: RO] 992 _adapter_trampoline -----------+ 993 | 994 _i2i_entry (same value as method B) | 995 _from_interpreted_entry (same value as method B) | 996 _from_compiled_entry (same value as method B) | 997 | 998 | 999 [Method B: RW] +--------+ 1000 _constMethod ----> [ConstMethod: RO] | 1001 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+ 1002 | 1003 +-------------------------------+ 1004 | 1005 +----> [AdapterHandlerEntry] (allocated at run time) 1006 _fingerprint 1007 _c2i_entry ---------------------------------+->[c2i entry..] 1008 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] | 1009 _from_interpreted_entry | _c2i_unverified_entry | | 1010 | | | | 1011 | | (_cds_entry_table: CODE) | | 1012 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | | 1013 | | (allocated at run time) | | 1014 | | ... [asm code ...] | | 1015 +-[not compiled]-+ [n]: jmp _entry_table[n] | | 1016 | | | 1017 | | | 1018 +-[compiled]-------------------------------------------------------------------+ | 1019 | 1020 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) | 1021 [jmp c2i_entry] ------------------------------------------------------+ 1022 1023 ***/ 1024 1025 // Called when the method_holder is getting linked. Setup entrypoints so the method 1026 // is ready to be called from interpreter, compiler, and vtables. 1027 void Method::link_method(const methodHandle& h_method, TRAPS) { 1028 // If the code cache is full, we may reenter this function for the 1029 // leftover methods that weren't linked. 1030 if (is_shared()) { 1031 address entry = Interpreter::entry_for_cds_method(h_method); 1032 assert(entry != NULL && entry == _i2i_entry, 1033 "should be correctly set during dump time"); 1034 if (adapter() != NULL) { 1035 return; 1036 } 1037 assert(entry == _from_interpreted_entry, 1038 "should be correctly set during dump time"); 1039 } else if (_i2i_entry != NULL) { 1040 return; 1041 } 1042 assert( _code == NULL, "nothing compiled yet" ); 1043 1044 // Setup interpreter entrypoint 1045 assert(this == h_method(), "wrong h_method()" ); 1046 1047 if (!is_shared()) { 1048 assert(adapter() == NULL, "init'd to NULL"); 1049 address entry = Interpreter::entry_for_method(h_method); 1050 assert(entry != NULL, "interpreter entry must be non-null"); 1051 // Sets both _i2i_entry and _from_interpreted_entry 1052 set_interpreter_entry(entry); 1053 } 1054 1055 // Don't overwrite already registered native entries. 1056 if (is_native() && !has_native_function()) { 1057 set_native_function( 1058 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1059 !native_bind_event_is_interesting); 1060 } 1061 1062 // Setup compiler entrypoint. This is made eagerly, so we do not need 1063 // special handling of vtables. An alternative is to make adapters more 1064 // lazily by calling make_adapter() from from_compiled_entry() for the 1065 // normal calls. For vtable calls life gets more complicated. When a 1066 // call-site goes mega-morphic we need adapters in all methods which can be 1067 // called from the vtable. We need adapters on such methods that get loaded 1068 // later. Ditto for mega-morphic itable calls. If this proves to be a 1069 // problem we'll make these lazily later. 1070 (void) make_adapters(h_method, CHECK); 1071 1072 // ONLY USE the h_method now as make_adapter may have blocked 1073 1074 } 1075 1076 address Method::make_adapters(methodHandle mh, TRAPS) { 1077 // Adapters for compiled code are made eagerly here. They are fairly 1078 // small (generally < 100 bytes) and quick to make (and cached and shared) 1079 // so making them eagerly shouldn't be too expensive. 1080 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1081 if (adapter == NULL ) { 1082 if (!is_init_completed()) { 1083 // Don't throw exceptions during VM initialization because java.lang.* classes 1084 // might not have been initialized, causing problems when constructing the 1085 // Java exception object. 1086 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1087 } else { 1088 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters"); 1089 } 1090 } 1091 1092 if (mh->is_shared()) { 1093 assert(mh->adapter() == adapter, "must be"); 1094 assert(mh->_from_compiled_entry != NULL, "must be"); 1095 } else { 1096 mh->set_adapter_entry(adapter); 1097 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1098 } 1099 return adapter->get_c2i_entry(); 1100 } 1101 1102 void Method::restore_unshareable_info(TRAPS) { 1103 assert(is_method() && is_valid_method(), "ensure C++ vtable is restored"); 1104 1105 // Since restore_unshareable_info can be called more than once for a method, don't 1106 // redo any work. 1107 if (adapter() == NULL) { 1108 methodHandle mh(THREAD, this); 1109 link_method(mh, CHECK); 1110 } 1111 } 1112 1113 volatile address Method::from_compiled_entry_no_trampoline() const { 1114 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 1115 if (code) { 1116 return code->verified_entry_point(); 1117 } else { 1118 return adapter()->get_c2i_entry(); 1119 } 1120 } 1121 1122 // The verified_code_entry() must be called when a invoke is resolved 1123 // on this method. 1124 1125 // It returns the compiled code entry point, after asserting not null. 1126 // This function is called after potential safepoints so that nmethod 1127 // or adapter that it points to is still live and valid. 1128 // This function must not hit a safepoint! 1129 address Method::verified_code_entry() { 1130 debug_only(NoSafepointVerifier nsv;) 1131 assert(_from_compiled_entry != NULL, "must be set"); 1132 return _from_compiled_entry; 1133 } 1134 1135 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1136 // (could be racing a deopt). 1137 // Not inline to avoid circular ref. 1138 bool Method::check_code() const { 1139 // cached in a register or local. There's a race on the value of the field. 1140 CompiledMethod *code = (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code); 1141 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 1142 } 1143 1144 // Install compiled code. Instantly it can execute. 1145 void Method::set_code(methodHandle mh, CompiledMethod *code) { 1146 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1147 assert( code, "use clear_code to remove code" ); 1148 assert( mh->check_code(), "" ); 1149 1150 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 1151 1152 // These writes must happen in this order, because the interpreter will 1153 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1154 // which jumps to _from_compiled_entry. 1155 mh->_code = code; // Assign before allowing compiled code to exec 1156 1157 int comp_level = code->comp_level(); 1158 // In theory there could be a race here. In practice it is unlikely 1159 // and not worth worrying about. 1160 if (comp_level > mh->highest_comp_level()) { 1161 mh->set_highest_comp_level(comp_level); 1162 } 1163 1164 OrderAccess::storestore(); 1165 #ifdef SHARK 1166 mh->_from_interpreted_entry = code->insts_begin(); 1167 #else //!SHARK 1168 mh->_from_compiled_entry = code->verified_entry_point(); 1169 OrderAccess::storestore(); 1170 // Instantly compiled code can execute. 1171 if (!mh->is_method_handle_intrinsic()) 1172 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1173 #endif //!SHARK 1174 } 1175 1176 1177 bool Method::is_overridden_in(Klass* k) const { 1178 InstanceKlass* ik = InstanceKlass::cast(k); 1179 1180 if (ik->is_interface()) return false; 1181 1182 // If method is an interface, we skip it - except if it 1183 // is a miranda method 1184 if (method_holder()->is_interface()) { 1185 // Check that method is not a miranda method 1186 if (ik->lookup_method(name(), signature()) == NULL) { 1187 // No implementation exist - so miranda method 1188 return false; 1189 } 1190 return true; 1191 } 1192 1193 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1194 if (!has_vtable_index()) { 1195 return false; 1196 } else { 1197 Method* vt_m = ik->method_at_vtable(vtable_index()); 1198 return vt_m != this; 1199 } 1200 } 1201 1202 1203 // give advice about whether this Method* should be cached or not 1204 bool Method::should_not_be_cached() const { 1205 if (is_old()) { 1206 // This method has been redefined. It is either EMCP or obsolete 1207 // and we don't want to cache it because that would pin the method 1208 // down and prevent it from being collectible if and when it 1209 // finishes executing. 1210 return true; 1211 } 1212 1213 // caching this method should be just fine 1214 return false; 1215 } 1216 1217 1218 /** 1219 * Returns true if this is one of the specially treated methods for 1220 * security related stack walks (like Reflection.getCallerClass). 1221 */ 1222 bool Method::is_ignored_by_security_stack_walk() const { 1223 if (intrinsic_id() == vmIntrinsics::_invoke) { 1224 // This is Method.invoke() -- ignore it 1225 return true; 1226 } 1227 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1228 // This is an auxilary frame -- ignore it 1229 return true; 1230 } 1231 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1232 // This is an internal adapter frame for method handles -- ignore it 1233 return true; 1234 } 1235 return false; 1236 } 1237 1238 1239 // Constant pool structure for invoke methods: 1240 enum { 1241 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1242 _imcp_invoke_signature, // utf8: (variable Symbol*) 1243 _imcp_limit 1244 }; 1245 1246 // Test if this method is an MH adapter frame generated by Java code. 1247 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1248 bool Method::is_compiled_lambda_form() const { 1249 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1250 } 1251 1252 // Test if this method is an internal MH primitive method. 1253 bool Method::is_method_handle_intrinsic() const { 1254 vmIntrinsics::ID iid = intrinsic_id(); 1255 return (MethodHandles::is_signature_polymorphic(iid) && 1256 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1257 } 1258 1259 bool Method::has_member_arg() const { 1260 vmIntrinsics::ID iid = intrinsic_id(); 1261 return (MethodHandles::is_signature_polymorphic(iid) && 1262 MethodHandles::has_member_arg(iid)); 1263 } 1264 1265 // Make an instance of a signature-polymorphic internal MH primitive. 1266 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1267 Symbol* signature, 1268 TRAPS) { 1269 ResourceMark rm; 1270 methodHandle empty; 1271 1272 InstanceKlass* holder = SystemDictionary::MethodHandle_klass(); 1273 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1274 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1275 if (TraceMethodHandles) { 1276 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1277 } 1278 1279 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1280 name->increment_refcount(); 1281 signature->increment_refcount(); 1282 1283 int cp_length = _imcp_limit; 1284 ClassLoaderData* loader_data = holder->class_loader_data(); 1285 constantPoolHandle cp; 1286 { 1287 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1288 cp = constantPoolHandle(THREAD, cp_oop); 1289 } 1290 cp->set_pool_holder(holder); 1291 cp->symbol_at_put(_imcp_invoke_name, name); 1292 cp->symbol_at_put(_imcp_invoke_signature, signature); 1293 cp->set_has_preresolution(); 1294 1295 // decide on access bits: public or not? 1296 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1297 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1298 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1299 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1300 1301 methodHandle m; 1302 { 1303 InlineTableSizes sizes; 1304 Method* m_oop = Method::allocate(loader_data, 0, 1305 accessFlags_from(flags_bits), &sizes, 1306 ConstMethod::NORMAL, CHECK_(empty)); 1307 m = methodHandle(THREAD, m_oop); 1308 } 1309 m->set_constants(cp()); 1310 m->set_name_index(_imcp_invoke_name); 1311 m->set_signature_index(_imcp_invoke_signature); 1312 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1313 assert(m->signature() == signature, ""); 1314 ResultTypeFinder rtf(signature); 1315 m->constMethod()->set_result_type(rtf.type()); 1316 m->compute_size_of_parameters(THREAD); 1317 m->init_intrinsic_id(); 1318 assert(m->is_method_handle_intrinsic(), ""); 1319 #ifdef ASSERT 1320 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1321 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1322 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1323 #endif //ASSERT 1324 1325 // Finally, set up its entry points. 1326 assert(m->can_be_statically_bound(), ""); 1327 m->set_vtable_index(Method::nonvirtual_vtable_index); 1328 m->link_method(m, CHECK_(empty)); 1329 1330 if (TraceMethodHandles && (Verbose || WizardMode)) { 1331 ttyLocker ttyl; 1332 m->print_on(tty); 1333 } 1334 1335 return m; 1336 } 1337 1338 Klass* Method::check_non_bcp_klass(Klass* klass) { 1339 if (klass != NULL && klass->class_loader() != NULL) { 1340 if (klass->is_objArray_klass()) 1341 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1342 return klass; 1343 } 1344 return NULL; 1345 } 1346 1347 1348 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1349 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1350 // Code below does not work for native methods - they should never get rewritten anyway 1351 assert(!m->is_native(), "cannot rewrite native methods"); 1352 // Allocate new Method* 1353 AccessFlags flags = m->access_flags(); 1354 1355 ConstMethod* cm = m->constMethod(); 1356 int checked_exceptions_len = cm->checked_exceptions_length(); 1357 int localvariable_len = cm->localvariable_table_length(); 1358 int exception_table_len = cm->exception_table_length(); 1359 int method_parameters_len = cm->method_parameters_length(); 1360 int method_annotations_len = cm->method_annotations_length(); 1361 int parameter_annotations_len = cm->parameter_annotations_length(); 1362 int type_annotations_len = cm->type_annotations_length(); 1363 int default_annotations_len = cm->default_annotations_length(); 1364 1365 InlineTableSizes sizes( 1366 localvariable_len, 1367 new_compressed_linenumber_size, 1368 exception_table_len, 1369 checked_exceptions_len, 1370 method_parameters_len, 1371 cm->generic_signature_index(), 1372 method_annotations_len, 1373 parameter_annotations_len, 1374 type_annotations_len, 1375 default_annotations_len, 1376 0); 1377 1378 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1379 Method* newm_oop = Method::allocate(loader_data, 1380 new_code_length, 1381 flags, 1382 &sizes, 1383 m->method_type(), 1384 CHECK_(methodHandle())); 1385 methodHandle newm (THREAD, newm_oop); 1386 1387 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1388 ConstMethod* newcm = newm->constMethod(); 1389 int new_const_method_size = newm->constMethod()->size(); 1390 1391 memcpy(newm(), m(), sizeof(Method)); 1392 1393 // Create shallow copy of ConstMethod. 1394 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1395 1396 // Reset correct method/const method, method size, and parameter info 1397 newm->set_constMethod(newcm); 1398 newm->constMethod()->set_code_size(new_code_length); 1399 newm->constMethod()->set_constMethod_size(new_const_method_size); 1400 assert(newm->code_size() == new_code_length, "check"); 1401 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1402 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1403 assert(newm->exception_table_length() == exception_table_len, "check"); 1404 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1405 // Copy new byte codes 1406 memcpy(newm->code_base(), new_code, new_code_length); 1407 // Copy line number table 1408 if (new_compressed_linenumber_size > 0) { 1409 memcpy(newm->compressed_linenumber_table(), 1410 new_compressed_linenumber_table, 1411 new_compressed_linenumber_size); 1412 } 1413 // Copy method_parameters 1414 if (method_parameters_len > 0) { 1415 memcpy(newm->method_parameters_start(), 1416 m->method_parameters_start(), 1417 method_parameters_len * sizeof(MethodParametersElement)); 1418 } 1419 // Copy checked_exceptions 1420 if (checked_exceptions_len > 0) { 1421 memcpy(newm->checked_exceptions_start(), 1422 m->checked_exceptions_start(), 1423 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1424 } 1425 // Copy exception table 1426 if (exception_table_len > 0) { 1427 memcpy(newm->exception_table_start(), 1428 m->exception_table_start(), 1429 exception_table_len * sizeof(ExceptionTableElement)); 1430 } 1431 // Copy local variable number table 1432 if (localvariable_len > 0) { 1433 memcpy(newm->localvariable_table_start(), 1434 m->localvariable_table_start(), 1435 localvariable_len * sizeof(LocalVariableTableElement)); 1436 } 1437 // Copy stackmap table 1438 if (m->has_stackmap_table()) { 1439 int code_attribute_length = m->stackmap_data()->length(); 1440 Array<u1>* stackmap_data = 1441 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1442 memcpy((void*)stackmap_data->adr_at(0), 1443 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1444 newm->set_stackmap_data(stackmap_data); 1445 } 1446 1447 // copy annotations over to new method 1448 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL); 1449 return newm; 1450 } 1451 1452 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) { 1453 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1454 // because we are not loading from core libraries 1455 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1456 // which does not use the class default class loader so we check for its loader here 1457 const InstanceKlass* ik = InstanceKlass::cast(holder); 1458 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1459 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1460 } 1461 1462 // see if the klass name is well-known: 1463 Symbol* klass_name = ik->name(); 1464 return vmSymbols::find_sid(klass_name); 1465 } 1466 1467 void Method::init_intrinsic_id() { 1468 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1469 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1470 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1471 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1472 1473 // the klass name is well-known: 1474 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1475 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1476 1477 // ditto for method and signature: 1478 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1479 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1480 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1481 && name_id == vmSymbols::NO_SID) { 1482 return; 1483 } 1484 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 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 && sig_id == vmSymbols::NO_SID) { 1488 return; 1489 } 1490 jshort flags = access_flags().as_short(); 1491 1492 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1493 if (id != vmIntrinsics::_none) { 1494 set_intrinsic_id(id); 1495 if (id == vmIntrinsics::_Class_cast) { 1496 // Even if the intrinsic is rejected, we want to inline this simple method. 1497 set_force_inline(true); 1498 } 1499 return; 1500 } 1501 1502 // A few slightly irregular cases: 1503 switch (klass_id) { 1504 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1505 // Second chance: check in regular Math. 1506 switch (name_id) { 1507 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1508 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1509 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1510 // pretend it is the corresponding method in the non-strict class: 1511 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1512 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1513 break; 1514 } 1515 break; 1516 1517 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1518 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1519 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1520 if (!is_native()) break; 1521 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1522 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1523 id = vmIntrinsics::_none; 1524 break; 1525 } 1526 1527 if (id != vmIntrinsics::_none) { 1528 // Set up its iid. It is an alias method. 1529 set_intrinsic_id(id); 1530 return; 1531 } 1532 } 1533 1534 // These two methods are static since a GC may move the Method 1535 bool Method::load_signature_classes(methodHandle m, TRAPS) { 1536 if (!THREAD->can_call_java()) { 1537 // There is nothing useful this routine can do from within the Compile thread. 1538 // Hopefully, the signature contains only well-known classes. 1539 // We could scan for this and return true/false, but the caller won't care. 1540 return false; 1541 } 1542 bool sig_is_loaded = true; 1543 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1544 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1545 ResourceMark rm(THREAD); 1546 Symbol* signature = m->signature(); 1547 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1548 if (ss.is_object()) { 1549 Symbol* sym = ss.as_symbol(CHECK_(false)); 1550 Symbol* name = sym; 1551 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1552 protection_domain, THREAD); 1553 // We are loading classes eagerly. If a ClassNotFoundException or 1554 // a LinkageError was generated, be sure to ignore it. 1555 if (HAS_PENDING_EXCEPTION) { 1556 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1557 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1558 CLEAR_PENDING_EXCEPTION; 1559 } else { 1560 return false; 1561 } 1562 } 1563 if( klass == NULL) { sig_is_loaded = false; } 1564 } 1565 } 1566 return sig_is_loaded; 1567 } 1568 1569 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1570 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1571 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1572 ResourceMark rm(THREAD); 1573 Symbol* signature = m->signature(); 1574 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1575 if (ss.type() == T_OBJECT) { 1576 Symbol* name = ss.as_symbol_or_null(); 1577 if (name == NULL) return true; 1578 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1579 if (klass == NULL) return true; 1580 } 1581 } 1582 return false; 1583 } 1584 1585 // Exposed so field engineers can debug VM 1586 void Method::print_short_name(outputStream* st) { 1587 ResourceMark rm; 1588 #ifdef PRODUCT 1589 st->print(" %s::", method_holder()->external_name()); 1590 #else 1591 st->print(" %s::", method_holder()->internal_name()); 1592 #endif 1593 name()->print_symbol_on(st); 1594 if (WizardMode) signature()->print_symbol_on(st); 1595 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1596 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1597 } 1598 1599 // Comparer for sorting an object array containing 1600 // Method*s. 1601 static int method_comparator(Method* a, Method* b) { 1602 return a->name()->fast_compare(b->name()); 1603 } 1604 1605 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1606 // default_methods also uses this without the ordering for fast find_method 1607 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) { 1608 int length = methods->length(); 1609 if (length > 1) { 1610 { 1611 NoSafepointVerifier nsv; 1612 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); 1613 } 1614 // Reset method ordering 1615 if (set_idnums) { 1616 for (int i = 0; i < length; i++) { 1617 Method* m = methods->at(i); 1618 m->set_method_idnum(i); 1619 m->set_orig_method_idnum(i); 1620 } 1621 } 1622 } 1623 } 1624 1625 //----------------------------------------------------------------------------------- 1626 // Non-product code unless JVM/TI needs it 1627 1628 #if !defined(PRODUCT) || INCLUDE_JVMTI 1629 class SignatureTypePrinter : public SignatureTypeNames { 1630 private: 1631 outputStream* _st; 1632 bool _use_separator; 1633 1634 void type_name(const char* name) { 1635 if (_use_separator) _st->print(", "); 1636 _st->print("%s", name); 1637 _use_separator = true; 1638 } 1639 1640 public: 1641 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1642 _st = st; 1643 _use_separator = false; 1644 } 1645 1646 void print_parameters() { _use_separator = false; iterate_parameters(); } 1647 void print_returntype() { _use_separator = false; iterate_returntype(); } 1648 }; 1649 1650 1651 void Method::print_name(outputStream* st) { 1652 Thread *thread = Thread::current(); 1653 ResourceMark rm(thread); 1654 st->print("%s ", is_static() ? "static" : "virtual"); 1655 if (WizardMode) { 1656 st->print("%s.", method_holder()->internal_name()); 1657 name()->print_symbol_on(st); 1658 signature()->print_symbol_on(st); 1659 } else { 1660 SignatureTypePrinter sig(signature(), st); 1661 sig.print_returntype(); 1662 st->print(" %s.", method_holder()->internal_name()); 1663 name()->print_symbol_on(st); 1664 st->print("("); 1665 sig.print_parameters(); 1666 st->print(")"); 1667 } 1668 } 1669 #endif // !PRODUCT || INCLUDE_JVMTI 1670 1671 1672 void Method::print_codes_on(outputStream* st) const { 1673 print_codes_on(0, code_size(), st); 1674 } 1675 1676 void Method::print_codes_on(int from, int to, outputStream* st) const { 1677 Thread *thread = Thread::current(); 1678 ResourceMark rm(thread); 1679 methodHandle mh (thread, (Method*)this); 1680 BytecodeStream s(mh); 1681 s.set_interval(from, to); 1682 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1683 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1684 } 1685 1686 1687 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1688 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1689 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1690 // as end-of-stream terminator. 1691 1692 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1693 // bci and line number does not compress into single byte. 1694 // Write out escape character and use regular compression for bci and line number. 1695 write_byte((jubyte)0xFF); 1696 write_signed_int(bci_delta); 1697 write_signed_int(line_delta); 1698 } 1699 1700 // See comment in method.hpp which explains why this exists. 1701 #if defined(_M_AMD64) && _MSC_VER >= 1400 1702 #pragma optimize("", off) 1703 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1704 write_pair_inline(bci, line); 1705 } 1706 #pragma optimize("", on) 1707 #endif 1708 1709 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1710 _bci = 0; 1711 _line = 0; 1712 }; 1713 1714 1715 bool CompressedLineNumberReadStream::read_pair() { 1716 jubyte next = read_byte(); 1717 // Check for terminator 1718 if (next == 0) return false; 1719 if (next == 0xFF) { 1720 // Escape character, regular compression used 1721 _bci += read_signed_int(); 1722 _line += read_signed_int(); 1723 } else { 1724 // Single byte compression used 1725 _bci += next >> 3; 1726 _line += next & 0x7; 1727 } 1728 return true; 1729 } 1730 1731 #if INCLUDE_JVMTI 1732 1733 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1734 BreakpointInfo* bp = method_holder()->breakpoints(); 1735 for (; bp != NULL; bp = bp->next()) { 1736 if (bp->match(this, bci)) { 1737 return bp->orig_bytecode(); 1738 } 1739 } 1740 { 1741 ResourceMark rm; 1742 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1743 } 1744 return Bytecodes::_shouldnotreachhere; 1745 } 1746 1747 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1748 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1749 BreakpointInfo* bp = method_holder()->breakpoints(); 1750 for (; bp != NULL; bp = bp->next()) { 1751 if (bp->match(this, bci)) { 1752 bp->set_orig_bytecode(code); 1753 // and continue, in case there is more than one 1754 } 1755 } 1756 } 1757 1758 void Method::set_breakpoint(int bci) { 1759 InstanceKlass* ik = method_holder(); 1760 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1761 bp->set_next(ik->breakpoints()); 1762 ik->set_breakpoints(bp); 1763 // do this last: 1764 bp->set(this); 1765 } 1766 1767 static void clear_matches(Method* m, int bci) { 1768 InstanceKlass* ik = m->method_holder(); 1769 BreakpointInfo* prev_bp = NULL; 1770 BreakpointInfo* next_bp; 1771 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1772 next_bp = bp->next(); 1773 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1774 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1775 // do this first: 1776 bp->clear(m); 1777 // unhook it 1778 if (prev_bp != NULL) 1779 prev_bp->set_next(next_bp); 1780 else 1781 ik->set_breakpoints(next_bp); 1782 delete bp; 1783 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1784 // at same location. So we have multiple matching (method_index and bci) 1785 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1786 // breakpoint for clear_breakpoint request and keep all other method versions 1787 // BreakpointInfo for future clear_breakpoint request. 1788 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1789 // which is being called when class is unloaded. We delete all the Breakpoint 1790 // information for all versions of method. We may not correctly restore the original 1791 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1792 // so these methods won't be used anymore. 1793 if (bci >= 0) { 1794 break; 1795 } 1796 } else { 1797 // This one is a keeper. 1798 prev_bp = bp; 1799 } 1800 } 1801 } 1802 1803 void Method::clear_breakpoint(int bci) { 1804 assert(bci >= 0, ""); 1805 clear_matches(this, bci); 1806 } 1807 1808 void Method::clear_all_breakpoints() { 1809 clear_matches(this, -1); 1810 } 1811 1812 #endif // INCLUDE_JVMTI 1813 1814 int Method::invocation_count() { 1815 MethodCounters *mcs = method_counters(); 1816 if (TieredCompilation) { 1817 MethodData* const mdo = method_data(); 1818 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1819 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1820 return InvocationCounter::count_limit; 1821 } else { 1822 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1823 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1824 } 1825 } else { 1826 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1827 } 1828 } 1829 1830 int Method::backedge_count() { 1831 MethodCounters *mcs = method_counters(); 1832 if (TieredCompilation) { 1833 MethodData* const mdo = method_data(); 1834 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1835 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1836 return InvocationCounter::count_limit; 1837 } else { 1838 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1839 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1840 } 1841 } else { 1842 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1843 } 1844 } 1845 1846 int Method::highest_comp_level() const { 1847 const MethodCounters* mcs = method_counters(); 1848 if (mcs != NULL) { 1849 return mcs->highest_comp_level(); 1850 } else { 1851 return CompLevel_none; 1852 } 1853 } 1854 1855 int Method::highest_osr_comp_level() const { 1856 const MethodCounters* mcs = method_counters(); 1857 if (mcs != NULL) { 1858 return mcs->highest_osr_comp_level(); 1859 } else { 1860 return CompLevel_none; 1861 } 1862 } 1863 1864 void Method::set_highest_comp_level(int level) { 1865 MethodCounters* mcs = method_counters(); 1866 if (mcs != NULL) { 1867 mcs->set_highest_comp_level(level); 1868 } 1869 } 1870 1871 void Method::set_highest_osr_comp_level(int level) { 1872 MethodCounters* mcs = method_counters(); 1873 if (mcs != NULL) { 1874 mcs->set_highest_osr_comp_level(level); 1875 } 1876 } 1877 1878 #if INCLUDE_JVMTI 1879 1880 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1881 _bci = bci; 1882 _name_index = m->name_index(); 1883 _signature_index = m->signature_index(); 1884 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1885 if (_orig_bytecode == Bytecodes::_breakpoint) 1886 _orig_bytecode = m->orig_bytecode_at(_bci); 1887 _next = NULL; 1888 } 1889 1890 void BreakpointInfo::set(Method* method) { 1891 #ifdef ASSERT 1892 { 1893 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1894 if (code == Bytecodes::_breakpoint) 1895 code = method->orig_bytecode_at(_bci); 1896 assert(orig_bytecode() == code, "original bytecode must be the same"); 1897 } 1898 #endif 1899 Thread *thread = Thread::current(); 1900 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1901 method->incr_number_of_breakpoints(thread); 1902 SystemDictionary::notice_modification(); 1903 { 1904 // Deoptimize all dependents on this method 1905 HandleMark hm(thread); 1906 methodHandle mh(thread, method); 1907 CodeCache::flush_dependents_on_method(mh); 1908 } 1909 } 1910 1911 void BreakpointInfo::clear(Method* method) { 1912 *method->bcp_from(_bci) = orig_bytecode(); 1913 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1914 method->decr_number_of_breakpoints(Thread::current()); 1915 } 1916 1917 #endif // INCLUDE_JVMTI 1918 1919 // jmethodID handling 1920 1921 // This is a block allocating object, sort of like JNIHandleBlock, only a 1922 // lot simpler. 1923 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1924 // never get rid of it. 1925 1926 static const int min_block_size = 8; 1927 1928 class JNIMethodBlockNode : public CHeapObj<mtClass> { 1929 friend class JNIMethodBlock; 1930 Method** _methods; 1931 int _number_of_methods; 1932 int _top; 1933 JNIMethodBlockNode* _next; 1934 1935 public: 1936 1937 JNIMethodBlockNode(int num_methods = min_block_size); 1938 1939 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 1940 1941 void ensure_methods(int num_addl_methods) { 1942 if (_top < _number_of_methods) { 1943 num_addl_methods -= _number_of_methods - _top; 1944 if (num_addl_methods <= 0) { 1945 return; 1946 } 1947 } 1948 if (_next == NULL) { 1949 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 1950 } else { 1951 _next->ensure_methods(num_addl_methods); 1952 } 1953 } 1954 }; 1955 1956 class JNIMethodBlock : public CHeapObj<mtClass> { 1957 JNIMethodBlockNode _head; 1958 JNIMethodBlockNode *_last_free; 1959 public: 1960 static Method* const _free_method; 1961 1962 JNIMethodBlock(int initial_capacity = min_block_size) 1963 : _head(initial_capacity), _last_free(&_head) {} 1964 1965 void ensure_methods(int num_addl_methods) { 1966 _last_free->ensure_methods(num_addl_methods); 1967 } 1968 1969 Method** add_method(Method* m) { 1970 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) { 1971 if (b->_top < b->_number_of_methods) { 1972 // top points to the next free entry. 1973 int i = b->_top; 1974 b->_methods[i] = m; 1975 b->_top++; 1976 _last_free = b; 1977 return &(b->_methods[i]); 1978 } else if (b->_top == b->_number_of_methods) { 1979 // if the next free entry ran off the block see if there's a free entry 1980 for (int i = 0; i < b->_number_of_methods; i++) { 1981 if (b->_methods[i] == _free_method) { 1982 b->_methods[i] = m; 1983 _last_free = b; 1984 return &(b->_methods[i]); 1985 } 1986 } 1987 // Only check each block once for frees. They're very unlikely. 1988 // Increment top past the end of the block. 1989 b->_top++; 1990 } 1991 // need to allocate a next block. 1992 if (b->_next == NULL) { 1993 b->_next = _last_free = new JNIMethodBlockNode(); 1994 } 1995 } 1996 guarantee(false, "Should always allocate a free block"); 1997 return NULL; 1998 } 1999 2000 bool contains(Method** m) { 2001 if (m == NULL) return false; 2002 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2003 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2004 // This is a bit of extra checking, for two reasons. One is 2005 // that contains() deals with pointers that are passed in by 2006 // JNI code, so making sure that the pointer is aligned 2007 // correctly is valuable. The other is that <= and > are 2008 // technically not defined on pointers, so the if guard can 2009 // pass spuriously; no modern compiler is likely to make that 2010 // a problem, though (and if one did, the guard could also 2011 // fail spuriously, which would be bad). 2012 ptrdiff_t idx = m - b->_methods; 2013 if (b->_methods + idx == m) { 2014 return true; 2015 } 2016 } 2017 } 2018 return false; // not found 2019 } 2020 2021 // Doesn't really destroy it, just marks it as free so it can be reused. 2022 void destroy_method(Method** m) { 2023 #ifdef ASSERT 2024 assert(contains(m), "should be a methodID"); 2025 #endif // ASSERT 2026 *m = _free_method; 2027 } 2028 2029 // During class unloading the methods are cleared, which is different 2030 // than freed. 2031 void clear_all_methods() { 2032 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2033 for (int i = 0; i< b->_number_of_methods; i++) { 2034 b->_methods[i] = NULL; 2035 } 2036 } 2037 } 2038 #ifndef PRODUCT 2039 int count_methods() { 2040 // count all allocated methods 2041 int count = 0; 2042 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2043 for (int i = 0; i< b->_number_of_methods; i++) { 2044 if (b->_methods[i] != _free_method) count++; 2045 } 2046 } 2047 return count; 2048 } 2049 #endif // PRODUCT 2050 }; 2051 2052 // Something that can't be mistaken for an address or a markOop 2053 Method* const JNIMethodBlock::_free_method = (Method*)55; 2054 2055 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) { 2056 _number_of_methods = MAX2(num_methods, min_block_size); 2057 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2058 for (int i = 0; i < _number_of_methods; i++) { 2059 _methods[i] = JNIMethodBlock::_free_method; 2060 } 2061 } 2062 2063 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) { 2064 ClassLoaderData* cld = loader_data; 2065 if (!SafepointSynchronize::is_at_safepoint()) { 2066 // Have to add jmethod_ids() to class loader data thread-safely. 2067 // Also have to add the method to the list safely, which the cld lock 2068 // protects as well. 2069 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2070 if (cld->jmethod_ids() == NULL) { 2071 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2072 } else { 2073 cld->jmethod_ids()->ensure_methods(capacity); 2074 } 2075 } else { 2076 // At safepoint, we are single threaded and can set this. 2077 if (cld->jmethod_ids() == NULL) { 2078 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2079 } else { 2080 cld->jmethod_ids()->ensure_methods(capacity); 2081 } 2082 } 2083 } 2084 2085 // Add a method id to the jmethod_ids 2086 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 2087 ClassLoaderData* cld = loader_data; 2088 2089 if (!SafepointSynchronize::is_at_safepoint()) { 2090 // Have to add jmethod_ids() to class loader data thread-safely. 2091 // Also have to add the method to the list safely, which the cld lock 2092 // protects as well. 2093 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2094 if (cld->jmethod_ids() == NULL) { 2095 cld->set_jmethod_ids(new JNIMethodBlock()); 2096 } 2097 // jmethodID is a pointer to Method* 2098 return (jmethodID)cld->jmethod_ids()->add_method(m); 2099 } else { 2100 // At safepoint, we are single threaded and can set this. 2101 if (cld->jmethod_ids() == NULL) { 2102 cld->set_jmethod_ids(new JNIMethodBlock()); 2103 } 2104 // jmethodID is a pointer to Method* 2105 return (jmethodID)cld->jmethod_ids()->add_method(m); 2106 } 2107 } 2108 2109 // Mark a jmethodID as free. This is called when there is a data race in 2110 // InstanceKlass while creating the jmethodID cache. 2111 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 2112 ClassLoaderData* cld = loader_data; 2113 Method** ptr = (Method**)m; 2114 assert(cld->jmethod_ids() != NULL, "should have method handles"); 2115 cld->jmethod_ids()->destroy_method(ptr); 2116 } 2117 2118 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2119 // Can't assert the method_holder is the same because the new method has the 2120 // scratch method holder. 2121 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2122 == new_method->method_holder()->class_loader(), 2123 "changing to a different class loader"); 2124 // Just change the method in place, jmethodID pointer doesn't change. 2125 *((Method**)jmid) = new_method; 2126 } 2127 2128 bool Method::is_method_id(jmethodID mid) { 2129 Method* m = resolve_jmethod_id(mid); 2130 assert(m != NULL, "should be called with non-null method"); 2131 InstanceKlass* ik = m->method_holder(); 2132 ClassLoaderData* cld = ik->class_loader_data(); 2133 if (cld->jmethod_ids() == NULL) return false; 2134 return (cld->jmethod_ids()->contains((Method**)mid)); 2135 } 2136 2137 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2138 if (mid == NULL) return NULL; 2139 Method* o = resolve_jmethod_id(mid); 2140 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 2141 return NULL; 2142 } 2143 return o; 2144 }; 2145 2146 void Method::set_on_stack(const bool value) { 2147 // Set both the method itself and its constant pool. The constant pool 2148 // on stack means some method referring to it is also on the stack. 2149 constants()->set_on_stack(value); 2150 2151 bool already_set = on_stack(); 2152 _access_flags.set_on_stack(value); 2153 if (value && !already_set) { 2154 MetadataOnStackMark::record(this); 2155 } 2156 } 2157 2158 // Called when the class loader is unloaded to make all methods weak. 2159 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2160 loader_data->jmethod_ids()->clear_all_methods(); 2161 } 2162 2163 bool Method::has_method_vptr(const void* ptr) { 2164 Method m; 2165 // This assumes that the vtbl pointer is the first word of a C++ object. 2166 return dereference_vptr(&m) == dereference_vptr(ptr); 2167 } 2168 2169 // Check that this pointer is valid by checking that the vtbl pointer matches 2170 bool Method::is_valid_method() const { 2171 if (this == NULL) { 2172 return false; 2173 } else if ((intptr_t(this) & (wordSize-1)) != 0) { 2174 // Quick sanity check on pointer. 2175 return false; 2176 } else if (MetaspaceShared::is_in_shared_space(this)) { 2177 return MetaspaceShared::is_valid_shared_method(this); 2178 } else if (Metaspace::contains_non_shared(this)) { 2179 return has_method_vptr((const void*)this); 2180 } else { 2181 return false; 2182 } 2183 } 2184 2185 #ifndef PRODUCT 2186 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 2187 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 2188 } 2189 #endif // PRODUCT 2190 2191 2192 // Printing 2193 2194 #ifndef PRODUCT 2195 2196 void Method::print_on(outputStream* st) const { 2197 ResourceMark rm; 2198 assert(is_method(), "must be method"); 2199 st->print_cr("%s", internal_name()); 2200 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this)); 2201 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2202 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants())); 2203 constants()->print_value_on(st); st->cr(); 2204 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2205 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2206 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2207 st->print_cr(" - max stack: %d", max_stack()); 2208 st->print_cr(" - max locals: %d", max_locals()); 2209 st->print_cr(" - size of params: %d", size_of_parameters()); 2210 st->print_cr(" - method size: %d", method_size()); 2211 if (intrinsic_id() != vmIntrinsics::_none) 2212 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 2213 if (highest_comp_level() != CompLevel_none) 2214 st->print_cr(" - highest level: %d", highest_comp_level()); 2215 st->print_cr(" - vtable index: %d", _vtable_index); 2216 if (valid_itable_index()) 2217 st->print_cr(" - itable index: %d", itable_index()); 2218 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry())); 2219 st->print( " - adapters: "); 2220 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2221 if (a == NULL) 2222 st->print_cr(INTPTR_FORMAT, p2i(a)); 2223 else 2224 a->print_adapter_on(st); 2225 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry())); 2226 st->print_cr(" - code size: %d", code_size()); 2227 if (code_size() != 0) { 2228 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base())); 2229 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size())); 2230 } 2231 if (method_data() != NULL) { 2232 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data())); 2233 } 2234 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2235 if (checked_exceptions_length() > 0) { 2236 CheckedExceptionElement* table = checked_exceptions_start(); 2237 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table)); 2238 if (Verbose) { 2239 for (int i = 0; i < checked_exceptions_length(); i++) { 2240 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2241 } 2242 } 2243 } 2244 if (has_linenumber_table()) { 2245 u_char* table = compressed_linenumber_table(); 2246 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table)); 2247 if (Verbose) { 2248 CompressedLineNumberReadStream stream(table); 2249 while (stream.read_pair()) { 2250 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2251 } 2252 } 2253 } 2254 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2255 if (localvariable_table_length() > 0) { 2256 LocalVariableTableElement* table = localvariable_table_start(); 2257 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table)); 2258 if (Verbose) { 2259 for (int i = 0; i < localvariable_table_length(); i++) { 2260 int bci = table[i].start_bci; 2261 int len = table[i].length; 2262 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2263 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2264 int slot = table[i].slot; 2265 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2266 } 2267 } 2268 } 2269 if (code() != NULL) { 2270 st->print (" - compiled code: "); 2271 code()->print_value_on(st); 2272 } 2273 if (is_native()) { 2274 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function())); 2275 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler())); 2276 } 2277 } 2278 2279 void Method::print_linkage_flags(outputStream* st) { 2280 access_flags().print_on(st); 2281 if (is_default_method()) { 2282 st->print("default "); 2283 } 2284 if (is_overpass()) { 2285 st->print("overpass "); 2286 } 2287 } 2288 #endif //PRODUCT 2289 2290 void Method::print_value_on(outputStream* st) const { 2291 assert(is_method(), "must be method"); 2292 st->print("%s", internal_name()); 2293 print_address_on(st); 2294 st->print(" "); 2295 if (WizardMode) access_flags().print_on(st); 2296 name()->print_value_on(st); 2297 st->print(" "); 2298 signature()->print_value_on(st); 2299 st->print(" in "); 2300 method_holder()->print_value_on(st); 2301 if (WizardMode) st->print("#%d", _vtable_index); 2302 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2303 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2304 } 2305 2306 #if INCLUDE_SERVICES 2307 // Size Statistics 2308 void Method::collect_statistics(KlassSizeStats *sz) const { 2309 int mysize = sz->count(this); 2310 sz->_method_bytes += mysize; 2311 sz->_method_all_bytes += mysize; 2312 sz->_rw_bytes += mysize; 2313 2314 if (constMethod()) { 2315 constMethod()->collect_statistics(sz); 2316 } 2317 if (method_data()) { 2318 method_data()->collect_statistics(sz); 2319 } 2320 } 2321 #endif // INCLUDE_SERVICES 2322 2323 // LogTouchedMethods and PrintTouchedMethods 2324 2325 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because 2326 // the Method may be garbage collected. Let's roll our own hash table. 2327 class TouchedMethodRecord : CHeapObj<mtTracing> { 2328 public: 2329 // It's OK to store Symbols here because they will NOT be GC'ed if 2330 // LogTouchedMethods is enabled. 2331 TouchedMethodRecord* _next; 2332 Symbol* _class_name; 2333 Symbol* _method_name; 2334 Symbol* _method_signature; 2335 }; 2336 2337 static const int TOUCHED_METHOD_TABLE_SIZE = 20011; 2338 static TouchedMethodRecord** _touched_method_table = NULL; 2339 2340 void Method::log_touched(TRAPS) { 2341 2342 const int table_size = TOUCHED_METHOD_TABLE_SIZE; 2343 Symbol* my_class = klass_name(); 2344 Symbol* my_name = name(); 2345 Symbol* my_sig = signature(); 2346 2347 unsigned int hash = my_class->identity_hash() + 2348 my_name->identity_hash() + 2349 my_sig->identity_hash(); 2350 juint index = juint(hash) % table_size; 2351 2352 MutexLocker ml(TouchedMethodLog_lock, THREAD); 2353 if (_touched_method_table == NULL) { 2354 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size, 2355 mtTracing, CURRENT_PC); 2356 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size); 2357 } 2358 2359 TouchedMethodRecord* ptr = _touched_method_table[index]; 2360 while (ptr) { 2361 if (ptr->_class_name == my_class && 2362 ptr->_method_name == my_name && 2363 ptr->_method_signature == my_sig) { 2364 return; 2365 } 2366 if (ptr->_next == NULL) break; 2367 ptr = ptr->_next; 2368 } 2369 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing); 2370 my_class->set_permanent(); // prevent reclaimed by GC 2371 my_name->set_permanent(); 2372 my_sig->set_permanent(); 2373 nptr->_class_name = my_class; 2374 nptr->_method_name = my_name; 2375 nptr->_method_signature = my_sig; 2376 nptr->_next = NULL; 2377 2378 if (ptr == NULL) { 2379 // first 2380 _touched_method_table[index] = nptr; 2381 } else { 2382 ptr->_next = nptr; 2383 } 2384 } 2385 2386 void Method::print_touched_methods(outputStream* out) { 2387 MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock); 2388 out->print_cr("# Method::print_touched_methods version 1"); 2389 if (_touched_method_table) { 2390 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) { 2391 TouchedMethodRecord* ptr = _touched_method_table[i]; 2392 while(ptr) { 2393 ptr->_class_name->print_symbol_on(out); out->print("."); 2394 ptr->_method_name->print_symbol_on(out); out->print(":"); 2395 ptr->_method_signature->print_symbol_on(out); out->cr(); 2396 ptr = ptr->_next; 2397 } 2398 } 2399 } 2400 } 2401 2402 // Verification 2403 2404 void Method::verify_on(outputStream* st) { 2405 guarantee(is_method(), "object must be method"); 2406 guarantee(constants()->is_constantPool(), "should be constant pool"); 2407 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 2408 MethodData* md = method_data(); 2409 guarantee(md == NULL || 2410 md->is_methodData(), "should be method data"); 2411 }