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/align.hpp" 62 #include "utilities/quickSort.hpp" 63 #include "utilities/vmError.hpp" 64 #include "utilities/xmlstream.hpp" 65 66 // Implementation of Method 67 68 Method* Method::allocate(ClassLoaderData* loader_data, 69 int byte_code_size, 70 AccessFlags access_flags, 71 InlineTableSizes* sizes, 72 ConstMethod::MethodType method_type, 73 TRAPS) { 74 assert(!access_flags.is_native() || byte_code_size == 0, 75 "native methods should not contain byte codes"); 76 ConstMethod* cm = ConstMethod::allocate(loader_data, 77 byte_code_size, 78 sizes, 79 method_type, 80 CHECK_NULL); 81 int size = Method::size(access_flags.is_native()); 82 return new (loader_data, size, false, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags); 83 } 84 85 Method::Method(ConstMethod* xconst, AccessFlags access_flags) { 86 NoSafepointVerifier no_safepoint; 87 set_constMethod(xconst); 88 set_access_flags(access_flags); 89 set_intrinsic_id(vmIntrinsics::_none); 90 set_force_inline(false); 91 set_hidden(false); 92 set_dont_inline(false); 93 set_has_injected_profile(false); 94 set_method_data(NULL); 95 clear_method_counters(); 96 set_vtable_index(Method::garbage_vtable_index); 97 98 // Fix and bury in Method* 99 set_interpreter_entry(NULL); // sets i2i entry and from_int 100 set_adapter_entry(NULL); 101 clear_code(false /* don't need a lock */); // from_c/from_i get set to c2i/i2i 102 103 if (access_flags.is_native()) { 104 clear_native_function(); 105 set_signature_handler(NULL); 106 } 107 108 NOT_PRODUCT(set_compiled_invocation_count(0);) 109 } 110 111 // Release Method*. The nmethod will be gone when we get here because 112 // we've walked the code cache. 113 void Method::deallocate_contents(ClassLoaderData* loader_data) { 114 MetadataFactory::free_metadata(loader_data, constMethod()); 115 set_constMethod(NULL); 116 MetadataFactory::free_metadata(loader_data, method_data()); 117 set_method_data(NULL); 118 MetadataFactory::free_metadata(loader_data, method_counters()); 119 clear_method_counters(); 120 // The nmethod will be gone when we get here. 121 if (code() != NULL) _code = NULL; 122 } 123 124 address Method::get_i2c_entry() { 125 assert(adapter() != NULL, "must have"); 126 return adapter()->get_i2c_entry(); 127 } 128 129 address Method::get_c2i_entry() { 130 assert(adapter() != NULL, "must have"); 131 return adapter()->get_c2i_entry(); 132 } 133 134 address Method::get_c2i_unverified_entry() { 135 assert(adapter() != NULL, "must have"); 136 return adapter()->get_c2i_unverified_entry(); 137 } 138 139 char* Method::name_and_sig_as_C_string() const { 140 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); 141 } 142 143 char* Method::name_and_sig_as_C_string(char* buf, int size) const { 144 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); 145 } 146 147 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 148 const char* klass_name = klass->external_name(); 149 int klass_name_len = (int)strlen(klass_name); 150 int method_name_len = method_name->utf8_length(); 151 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 152 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 153 strcpy(dest, klass_name); 154 dest[klass_name_len] = '.'; 155 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 156 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 157 dest[len] = 0; 158 return dest; 159 } 160 161 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 162 Symbol* klass_name = klass->name(); 163 klass_name->as_klass_external_name(buf, size); 164 int len = (int)strlen(buf); 165 166 if (len < size - 1) { 167 buf[len++] = '.'; 168 169 method_name->as_C_string(&(buf[len]), size - len); 170 len = (int)strlen(buf); 171 172 signature->as_C_string(&(buf[len]), size - len); 173 } 174 175 return buf; 176 } 177 178 int Method::fast_exception_handler_bci_for(methodHandle mh, Klass* ex_klass, int throw_bci, TRAPS) { 179 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 180 // access exception table 181 ExceptionTable table(mh()); 182 int length = table.length(); 183 // iterate through all entries sequentially 184 constantPoolHandle pool(THREAD, mh->constants()); 185 for (int i = 0; i < length; i ++) { 186 //reacquire the table in case a GC happened 187 ExceptionTable table(mh()); 188 int beg_bci = table.start_pc(i); 189 int end_bci = table.end_pc(i); 190 assert(beg_bci <= end_bci, "inconsistent exception table"); 191 if (beg_bci <= throw_bci && throw_bci < end_bci) { 192 // exception handler bci range covers throw_bci => investigate further 193 int handler_bci = table.handler_pc(i); 194 int klass_index = table.catch_type_index(i); 195 if (klass_index == 0) { 196 return handler_bci; 197 } else if (ex_klass == NULL) { 198 return handler_bci; 199 } else { 200 // we know the exception class => get the constraint class 201 // this may require loading of the constraint class; if verification 202 // fails or some other exception occurs, return handler_bci 203 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); 204 assert(k != NULL, "klass not loaded"); 205 if (ex_klass->is_subtype_of(k)) { 206 return handler_bci; 207 } 208 } 209 } 210 } 211 212 return -1; 213 } 214 215 void Method::mask_for(int bci, InterpreterOopMap* mask) { 216 217 Thread* myThread = Thread::current(); 218 methodHandle h_this(myThread, this); 219 #if defined(ASSERT) && !INCLUDE_JVMCI 220 bool has_capability = myThread->is_VM_thread() || 221 myThread->is_ConcurrentGC_thread() || 222 myThread->is_GC_task_thread(); 223 224 if (!has_capability) { 225 if (!VerifyStack && !VerifyLastFrame) { 226 // verify stack calls this outside VM thread 227 warning("oopmap should only be accessed by the " 228 "VM, GC task or CMS threads (or during debugging)"); 229 InterpreterOopMap local_mask; 230 method_holder()->mask_for(h_this, bci, &local_mask); 231 local_mask.print(); 232 } 233 } 234 #endif 235 method_holder()->mask_for(h_this, bci, mask); 236 return; 237 } 238 239 240 int Method::bci_from(address bcp) const { 241 if (is_native() && bcp == 0) { 242 return 0; 243 } 244 #ifdef ASSERT 245 { 246 ResourceMark rm; 247 assert(is_native() && bcp == code_base() || contains(bcp) || VMError::is_error_reported(), 248 "bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", 249 p2i(bcp), name_and_sig_as_C_string()); 250 } 251 #endif 252 return bcp - code_base(); 253 } 254 255 256 int Method::validate_bci(int bci) const { 257 return (bci == 0 || bci < code_size()) ? bci : -1; 258 } 259 260 // Return bci if it appears to be a valid bcp 261 // Return -1 otherwise. 262 // Used by profiling code, when invalid data is a possibility. 263 // The caller is responsible for validating the Method* itself. 264 int Method::validate_bci_from_bcp(address bcp) const { 265 // keep bci as -1 if not a valid bci 266 int bci = -1; 267 if (bcp == 0 || bcp == code_base()) { 268 // code_size() may return 0 and we allow 0 here 269 // the method may be native 270 bci = 0; 271 } else if (contains(bcp)) { 272 bci = bcp - code_base(); 273 } 274 // Assert that if we have dodged any asserts, bci is negative. 275 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 276 return bci; 277 } 278 279 address Method::bcp_from(int bci) const { 280 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), 281 "illegal bci: %d for %s method", bci, is_native() ? "native" : "non-native"); 282 address bcp = code_base() + bci; 283 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 284 return bcp; 285 } 286 287 address Method::bcp_from(address bcp) const { 288 if (is_native() && bcp == NULL) { 289 return code_base(); 290 } else { 291 return bcp; 292 } 293 } 294 295 int Method::size(bool is_native) { 296 // If native, then include pointers for native_function and signature_handler 297 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 298 int extra_words = align_up(extra_bytes, BytesPerWord) / BytesPerWord; 299 return align_metadata_size(header_size() + extra_words); 300 } 301 302 303 Symbol* Method::klass_name() const { 304 return method_holder()->name(); 305 } 306 307 308 // Attempt to return method oop to original state. Clear any pointers 309 // (to objects outside the shared spaces). We won't be able to predict 310 // where they should point in a new JVM. Further initialize some 311 // entries now in order allow them to be write protected later. 312 313 void Method::remove_unshareable_info() { 314 unlink_method(); 315 } 316 317 void Method::set_vtable_index(int index) { 318 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 319 // At runtime initialize_vtable is rerun as part of link_class_impl() 320 // for a shared class loaded by the non-boot loader to obtain the loader 321 // constraints based on the runtime classloaders' context. 322 return; // don't write into the shared class 323 } else { 324 _vtable_index = index; 325 } 326 } 327 328 void Method::set_itable_index(int index) { 329 if (is_shared() && !MetaspaceShared::remapped_readwrite()) { 330 // At runtime initialize_itable is rerun as part of link_class_impl() 331 // for a shared class loaded by the non-boot loader to obtain the loader 332 // constraints based on the runtime classloaders' context. The dumptime 333 // itable index should be the same as the runtime index. 334 assert(_vtable_index == itable_index_max - index, 335 "archived itable index is different from runtime index"); 336 return; // don’t write into the shared class 337 } else { 338 _vtable_index = itable_index_max - index; 339 } 340 assert(valid_itable_index(), ""); 341 } 342 343 344 345 bool Method::was_executed_more_than(int n) { 346 // Invocation counter is reset when the Method* is compiled. 347 // If the method has compiled code we therefore assume it has 348 // be excuted more than n times. 349 if (is_accessor() || is_empty_method() || (code() != NULL)) { 350 // interpreter doesn't bump invocation counter of trivial methods 351 // compiler does not bump invocation counter of compiled methods 352 return true; 353 } 354 else if ((method_counters() != NULL && 355 method_counters()->invocation_counter()->carry()) || 356 (method_data() != NULL && 357 method_data()->invocation_counter()->carry())) { 358 // The carry bit is set when the counter overflows and causes 359 // a compilation to occur. We don't know how many times 360 // the counter has been reset, so we simply assume it has 361 // been executed more than n times. 362 return true; 363 } else { 364 return invocation_count() > n; 365 } 366 } 367 368 void Method::print_invocation_count() { 369 if (is_static()) tty->print("static "); 370 if (is_final()) tty->print("final "); 371 if (is_synchronized()) tty->print("synchronized "); 372 if (is_native()) tty->print("native "); 373 tty->print("%s::", method_holder()->external_name()); 374 name()->print_symbol_on(tty); 375 signature()->print_symbol_on(tty); 376 377 if (WizardMode) { 378 // dump the size of the byte codes 379 tty->print(" {%d}", code_size()); 380 } 381 tty->cr(); 382 383 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 384 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 385 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 386 #ifndef PRODUCT 387 if (CountCompiledCalls) { 388 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 389 } 390 #endif 391 } 392 393 // Build a MethodData* object to hold information about this method 394 // collected in the interpreter. 395 void Method::build_interpreter_method_data(const methodHandle& method, TRAPS) { 396 // Do not profile the method if metaspace has hit an OOM previously 397 // allocating profiling data. Callers clear pending exception so don't 398 // add one here. 399 if (ClassLoaderDataGraph::has_metaspace_oom()) { 400 return; 401 } 402 403 // Grab a lock here to prevent multiple 404 // MethodData*s from being created. 405 MutexLocker ml(MethodData_lock, THREAD); 406 if (method->method_data() == NULL) { 407 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); 408 MethodData* method_data = MethodData::allocate(loader_data, method, THREAD); 409 if (HAS_PENDING_EXCEPTION) { 410 CompileBroker::log_metaspace_failure(); 411 ClassLoaderDataGraph::set_metaspace_oom(true); 412 return; // return the exception (which is cleared) 413 } 414 415 method->set_method_data(method_data); 416 if (PrintMethodData && (Verbose || WizardMode)) { 417 ResourceMark rm(THREAD); 418 tty->print("build_interpreter_method_data for "); 419 method->print_name(tty); 420 tty->cr(); 421 // At the end of the run, the MDO, full of data, will be dumped. 422 } 423 } 424 } 425 426 MethodCounters* Method::build_method_counters(Method* m, TRAPS) { 427 // Do not profile the method if metaspace has hit an OOM previously 428 if (ClassLoaderDataGraph::has_metaspace_oom()) { 429 return NULL; 430 } 431 432 methodHandle mh(m); 433 MethodCounters* counters = MethodCounters::allocate(mh, THREAD); 434 if (HAS_PENDING_EXCEPTION) { 435 CompileBroker::log_metaspace_failure(); 436 ClassLoaderDataGraph::set_metaspace_oom(true); 437 return NULL; // return the exception (which is cleared) 438 } 439 if (!mh->init_method_counters(counters)) { 440 MetadataFactory::free_metadata(mh->method_holder()->class_loader_data(), counters); 441 } 442 443 if (LogTouchedMethods) { 444 mh->log_touched(CHECK_NULL); 445 } 446 447 return mh->method_counters(); 448 } 449 450 void Method::cleanup_inline_caches() { 451 // The current system doesn't use inline caches in the interpreter 452 // => nothing to do (keep this method around for future use) 453 } 454 455 456 int Method::extra_stack_words() { 457 // not an inline function, to avoid a header dependency on Interpreter 458 return extra_stack_entries() * Interpreter::stackElementSize; 459 } 460 461 462 void Method::compute_size_of_parameters(Thread *thread) { 463 ArgumentSizeComputer asc(signature()); 464 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 465 } 466 467 BasicType Method::result_type() const { 468 ResultTypeFinder rtf(signature()); 469 return rtf.type(); 470 } 471 472 473 bool Method::is_empty_method() const { 474 return code_size() == 1 475 && *code_base() == Bytecodes::_return; 476 } 477 478 479 bool Method::is_vanilla_constructor() const { 480 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 481 // which only calls the superclass vanilla constructor and possibly does stores of 482 // zero constants to local fields: 483 // 484 // aload_0 485 // invokespecial 486 // indexbyte1 487 // indexbyte2 488 // 489 // followed by an (optional) sequence of: 490 // 491 // aload_0 492 // aconst_null / iconst_0 / fconst_0 / dconst_0 493 // putfield 494 // indexbyte1 495 // indexbyte2 496 // 497 // followed by: 498 // 499 // return 500 501 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 502 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 503 int size = code_size(); 504 // Check if size match 505 if (size == 0 || size % 5 != 0) return false; 506 address cb = code_base(); 507 int last = size - 1; 508 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 509 // Does not call superclass default constructor 510 return false; 511 } 512 // Check optional sequence 513 for (int i = 4; i < last; i += 5) { 514 if (cb[i] != Bytecodes::_aload_0) return false; 515 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 516 if (cb[i+2] != Bytecodes::_putfield) return false; 517 } 518 return true; 519 } 520 521 522 bool Method::compute_has_loops_flag() { 523 BytecodeStream bcs(this); 524 Bytecodes::Code bc; 525 526 while ((bc = bcs.next()) >= 0) { 527 switch( bc ) { 528 case Bytecodes::_ifeq: 529 case Bytecodes::_ifnull: 530 case Bytecodes::_iflt: 531 case Bytecodes::_ifle: 532 case Bytecodes::_ifne: 533 case Bytecodes::_ifnonnull: 534 case Bytecodes::_ifgt: 535 case Bytecodes::_ifge: 536 case Bytecodes::_if_icmpeq: 537 case Bytecodes::_if_icmpne: 538 case Bytecodes::_if_icmplt: 539 case Bytecodes::_if_icmpgt: 540 case Bytecodes::_if_icmple: 541 case Bytecodes::_if_icmpge: 542 case Bytecodes::_if_acmpeq: 543 case Bytecodes::_if_acmpne: 544 case Bytecodes::_goto: 545 case Bytecodes::_jsr: 546 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 547 break; 548 549 case Bytecodes::_goto_w: 550 case Bytecodes::_jsr_w: 551 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 552 break; 553 554 default: 555 break; 556 } 557 } 558 _access_flags.set_loops_flag_init(); 559 return _access_flags.has_loops(); 560 } 561 562 bool Method::is_final_method(AccessFlags class_access_flags) const { 563 // or "does_not_require_vtable_entry" 564 // default method or overpass can occur, is not final (reuses vtable entry) 565 // private methods in classes get vtable entries for backward class compatibility. 566 if (is_overpass() || is_default_method()) return false; 567 return is_final() || class_access_flags.is_final(); 568 } 569 570 bool Method::is_final_method() const { 571 return is_final_method(method_holder()->access_flags()); 572 } 573 574 bool Method::is_default_method() const { 575 if (method_holder() != NULL && 576 method_holder()->is_interface() && 577 !is_abstract() && !is_private()) { 578 return true; 579 } else { 580 return false; 581 } 582 } 583 584 bool Method::can_be_statically_bound(AccessFlags class_access_flags) const { 585 if (is_final_method(class_access_flags)) return true; 586 #ifdef ASSERT 587 ResourceMark rm; 588 bool is_nonv = (vtable_index() == nonvirtual_vtable_index); 589 if (class_access_flags.is_interface()) { 590 assert(is_nonv == is_static() || is_nonv == is_private(), 591 "nonvirtual unexpected for non-static, non-private: %s", 592 name_and_sig_as_C_string()); 593 } 594 #endif 595 assert(valid_vtable_index() || valid_itable_index(), "method must be linked before we ask this question"); 596 return vtable_index() == nonvirtual_vtable_index; 597 } 598 599 bool Method::can_be_statically_bound() const { 600 return can_be_statically_bound(method_holder()->access_flags()); 601 } 602 603 bool Method::is_accessor() const { 604 return is_getter() || is_setter(); 605 } 606 607 bool Method::is_getter() const { 608 if (code_size() != 5) return false; 609 if (size_of_parameters() != 1) return false; 610 if (java_code_at(0) != Bytecodes::_aload_0) return false; 611 if (java_code_at(1) != Bytecodes::_getfield) return false; 612 switch (java_code_at(4)) { 613 case Bytecodes::_ireturn: 614 case Bytecodes::_lreturn: 615 case Bytecodes::_freturn: 616 case Bytecodes::_dreturn: 617 case Bytecodes::_areturn: 618 break; 619 default: 620 return false; 621 } 622 return true; 623 } 624 625 bool Method::is_setter() const { 626 if (code_size() != 6) return false; 627 if (java_code_at(0) != Bytecodes::_aload_0) return false; 628 switch (java_code_at(1)) { 629 case Bytecodes::_iload_1: 630 case Bytecodes::_aload_1: 631 case Bytecodes::_fload_1: 632 if (size_of_parameters() != 2) return false; 633 break; 634 case Bytecodes::_dload_1: 635 case Bytecodes::_lload_1: 636 if (size_of_parameters() != 3) return false; 637 break; 638 default: 639 return false; 640 } 641 if (java_code_at(2) != Bytecodes::_putfield) return false; 642 if (java_code_at(5) != Bytecodes::_return) return false; 643 return true; 644 } 645 646 bool Method::is_constant_getter() const { 647 int last_index = code_size() - 1; 648 // Check if the first 1-3 bytecodes are a constant push 649 // and the last bytecode is a return. 650 return (2 <= code_size() && code_size() <= 4 && 651 Bytecodes::is_const(java_code_at(0)) && 652 Bytecodes::length_for(java_code_at(0)) == last_index && 653 Bytecodes::is_return(java_code_at(last_index))); 654 } 655 656 bool Method::is_initializer() const { 657 return is_object_initializer() || is_static_initializer(); 658 } 659 660 bool Method::has_valid_initializer_flags() const { 661 return (is_static() || 662 method_holder()->major_version() < 51); 663 } 664 665 bool Method::is_static_initializer() const { 666 // For classfiles version 51 or greater, ensure that the clinit method is 667 // static. Non-static methods with the name "<clinit>" are not static 668 // initializers. (older classfiles exempted for backward compatibility) 669 return name() == vmSymbols::class_initializer_name() && 670 has_valid_initializer_flags(); 671 } 672 673 bool Method::is_object_initializer() const { 674 return name() == vmSymbols::object_initializer_name(); 675 } 676 677 objArrayHandle Method::resolved_checked_exceptions_impl(Method* method, TRAPS) { 678 int length = method->checked_exceptions_length(); 679 if (length == 0) { // common case 680 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 681 } else { 682 methodHandle h_this(THREAD, method); 683 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 684 objArrayHandle mirrors (THREAD, m_oop); 685 for (int i = 0; i < length; i++) { 686 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 687 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 688 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 689 mirrors->obj_at_put(i, k->java_mirror()); 690 } 691 return mirrors; 692 } 693 }; 694 695 696 int Method::line_number_from_bci(int bci) const { 697 if (bci == SynchronizationEntryBCI) bci = 0; 698 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 699 int best_bci = 0; 700 int best_line = -1; 701 702 if (has_linenumber_table()) { 703 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 704 // Not necessarily sorted and not necessarily one-to-one. 705 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 706 while (stream.read_pair()) { 707 if (stream.bci() == bci) { 708 // perfect match 709 return stream.line(); 710 } else { 711 // update best_bci/line 712 if (stream.bci() < bci && stream.bci() >= best_bci) { 713 best_bci = stream.bci(); 714 best_line = stream.line(); 715 } 716 } 717 } 718 } 719 return best_line; 720 } 721 722 723 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { 724 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 725 Thread *thread = Thread::current(); 726 Symbol* klass_name = constants()->klass_name_at(klass_index); 727 Handle loader(thread, method_holder()->class_loader()); 728 Handle prot (thread, method_holder()->protection_domain()); 729 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 730 } else { 731 return true; 732 } 733 } 734 735 736 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 737 int klass_index = constants()->klass_ref_index_at(refinfo_index); 738 if (must_be_resolved) { 739 // Make sure klass is resolved in constantpool. 740 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 741 } 742 return is_klass_loaded_by_klass_index(klass_index); 743 } 744 745 746 void Method::set_native_function(address function, bool post_event_flag) { 747 assert(function != NULL, "use clear_native_function to unregister natives"); 748 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 749 address* native_function = native_function_addr(); 750 751 // We can see racers trying to place the same native function into place. Once 752 // is plenty. 753 address current = *native_function; 754 if (current == function) return; 755 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 756 function != NULL) { 757 // native_method_throw_unsatisfied_link_error_entry() should only 758 // be passed when post_event_flag is false. 759 assert(function != 760 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 761 "post_event_flag mis-match"); 762 763 // post the bind event, and possible change the bind function 764 JvmtiExport::post_native_method_bind(this, &function); 765 } 766 *native_function = function; 767 // This function can be called more than once. We must make sure that we always 768 // use the latest registered method -> check if a stub already has been generated. 769 // If so, we have to make it not_entrant. 770 CompiledMethod* nm = code(); // Put it into local variable to guard against concurrent updates 771 if (nm != NULL) { 772 nm->make_not_entrant(); 773 } 774 } 775 776 777 bool Method::has_native_function() const { 778 if (is_method_handle_intrinsic()) 779 return false; // special-cased in SharedRuntime::generate_native_wrapper 780 address func = native_function(); 781 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 782 } 783 784 785 void Method::clear_native_function() { 786 // Note: is_method_handle_intrinsic() is allowed here. 787 set_native_function( 788 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 789 !native_bind_event_is_interesting); 790 clear_code(); 791 } 792 793 address Method::critical_native_function() { 794 methodHandle mh(this); 795 return NativeLookup::lookup_critical_entry(mh); 796 } 797 798 799 void Method::set_signature_handler(address handler) { 800 address* signature_handler = signature_handler_addr(); 801 *signature_handler = handler; 802 } 803 804 805 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { 806 if (PrintCompilation && report) { 807 ttyLocker ttyl; 808 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 809 if (comp_level == CompLevel_all) { 810 tty->print("all levels "); 811 } else { 812 tty->print("levels "); 813 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 814 tty->print("%d ", i); 815 } 816 } 817 this->print_short_name(tty); 818 int size = this->code_size(); 819 if (size > 0) { 820 tty->print(" (%d bytes)", size); 821 } 822 if (reason != NULL) { 823 tty->print(" %s", reason); 824 } 825 tty->cr(); 826 } 827 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 828 ttyLocker ttyl; 829 xtty->begin_elem("make_not_compilable thread='" UINTX_FORMAT "' osr='%d' level='%d'", 830 os::current_thread_id(), is_osr, comp_level); 831 if (reason != NULL) { 832 xtty->print(" reason=\'%s\'", reason); 833 } 834 xtty->method(this); 835 xtty->stamp(); 836 xtty->end_elem(); 837 } 838 } 839 840 bool Method::is_always_compilable() const { 841 // Generated adapters must be compiled 842 if (is_method_handle_intrinsic() && is_synthetic()) { 843 assert(!is_not_c1_compilable(), "sanity check"); 844 assert(!is_not_c2_compilable(), "sanity check"); 845 return true; 846 } 847 848 return false; 849 } 850 851 bool Method::is_not_compilable(int comp_level) const { 852 if (number_of_breakpoints() > 0) 853 return true; 854 if (is_always_compilable()) 855 return false; 856 if (comp_level == CompLevel_any) 857 return is_not_c1_compilable() || is_not_c2_compilable(); 858 if (is_c1_compile(comp_level)) 859 return is_not_c1_compilable(); 860 if (is_c2_compile(comp_level)) 861 return is_not_c2_compilable(); 862 return false; 863 } 864 865 // call this when compiler finds that this method is not compilable 866 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { 867 if (is_always_compilable()) { 868 // Don't mark a method which should be always compilable 869 return; 870 } 871 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); 872 if (comp_level == CompLevel_all) { 873 set_not_c1_compilable(); 874 set_not_c2_compilable(); 875 } else { 876 if (is_c1_compile(comp_level)) 877 set_not_c1_compilable(); 878 if (is_c2_compile(comp_level)) 879 set_not_c2_compilable(); 880 } 881 CompilationPolicy::policy()->disable_compilation(this); 882 assert(!CompilationPolicy::can_be_compiled(this, comp_level), "sanity check"); 883 } 884 885 bool Method::is_not_osr_compilable(int comp_level) const { 886 if (is_not_compilable(comp_level)) 887 return true; 888 if (comp_level == CompLevel_any) 889 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 890 if (is_c1_compile(comp_level)) 891 return is_not_c1_osr_compilable(); 892 if (is_c2_compile(comp_level)) 893 return is_not_c2_osr_compilable(); 894 return false; 895 } 896 897 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { 898 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); 899 if (comp_level == CompLevel_all) { 900 set_not_c1_osr_compilable(); 901 set_not_c2_osr_compilable(); 902 } else { 903 if (is_c1_compile(comp_level)) 904 set_not_c1_osr_compilable(); 905 if (is_c2_compile(comp_level)) 906 set_not_c2_osr_compilable(); 907 } 908 CompilationPolicy::policy()->disable_compilation(this); 909 assert(!CompilationPolicy::can_be_osr_compiled(this, comp_level), "sanity check"); 910 } 911 912 // Revert to using the interpreter and clear out the nmethod 913 void Method::clear_code(bool acquire_lock /* = true */) { 914 MutexLockerEx pl(acquire_lock ? Patching_lock : NULL, Mutex::_no_safepoint_check_flag); 915 // this may be NULL if c2i adapters have not been made yet 916 // Only should happen at allocate time. 917 if (adapter() == NULL) { 918 _from_compiled_entry = NULL; 919 } else { 920 _from_compiled_entry = adapter()->get_c2i_entry(); 921 } 922 OrderAccess::storestore(); 923 _from_interpreted_entry = _i2i_entry; 924 OrderAccess::storestore(); 925 _code = NULL; 926 } 927 928 #if INCLUDE_CDS 929 // Called by class data sharing to remove any entry points (which are not shared) 930 void Method::unlink_method() { 931 _code = NULL; 932 933 assert(DumpSharedSpaces, "dump time only"); 934 // Set the values to what they should be at run time. Note that 935 // this Method can no longer be executed during dump time. 936 _i2i_entry = Interpreter::entry_for_cds_method(this); 937 _from_interpreted_entry = _i2i_entry; 938 939 if (is_native()) { 940 *native_function_addr() = NULL; 941 set_signature_handler(NULL); 942 } 943 NOT_PRODUCT(set_compiled_invocation_count(0);) 944 945 CDSAdapterHandlerEntry* cds_adapter = (CDSAdapterHandlerEntry*)adapter(); 946 constMethod()->set_adapter_trampoline(cds_adapter->get_adapter_trampoline()); 947 _from_compiled_entry = cds_adapter->get_c2i_entry_trampoline(); 948 assert(*((int*)_from_compiled_entry) == 0, "must be NULL during dump time, to be initialized at run time"); 949 950 951 // In case of DumpSharedSpaces, _method_data should always be NULL. 952 assert(_method_data == NULL, "unexpected method data?"); 953 954 set_method_data(NULL); 955 clear_method_counters(); 956 } 957 #endif 958 959 /**************************************************************************** 960 // The following illustrates how the entries work for CDS shared Methods: 961 // 962 // Our goal is to delay writing into a shared Method until it's compiled. 963 // Hence, we want to determine the initial values for _i2i_entry, 964 // _from_interpreted_entry and _from_compiled_entry during CDS dump time. 965 // 966 // In this example, both Methods A and B have the _i2i_entry of "zero_locals". 967 // They also have similar signatures so that they will share the same 968 // AdapterHandlerEntry. 969 // 970 // _adapter_trampoline points to a fixed location in the RW section of 971 // the CDS archive. This location initially contains a NULL pointer. When the 972 // first of method A or B is linked, an AdapterHandlerEntry is allocated 973 // dynamically, and its c2i/i2c entries are generated. 974 // 975 // _i2i_entry and _from_interpreted_entry initially points to the same 976 // (fixed) location in the CODE section of the CDS archive. This contains 977 // an unconditional branch to the actual entry for "zero_locals", which is 978 // generated at run time and may be on an arbitrary address. Thus, the 979 // unconditional branch is also generated at run time to jump to the correct 980 // address. 981 // 982 // Similarly, _from_compiled_entry points to a fixed address in the CODE 983 // section. This address has enough space for an unconditional branch 984 // instruction, and is initially zero-filled. After the AdapterHandlerEntry is 985 // initialized, and the address for the actual c2i_entry is known, we emit a 986 // branch instruction here to branch to the actual c2i_entry. 987 // 988 // The effect of the extra branch on the i2i and c2i entries is negligible. 989 // 990 // The reason for putting _adapter_trampoline in RO is many shared Methods 991 // share the same AdapterHandlerEntry, so we can save space in the RW section 992 // by having the extra indirection. 993 994 995 [Method A: RW] 996 _constMethod ----> [ConstMethod: RO] 997 _adapter_trampoline -----------+ 998 | 999 _i2i_entry (same value as method B) | 1000 _from_interpreted_entry (same value as method B) | 1001 _from_compiled_entry (same value as method B) | 1002 | 1003 | 1004 [Method B: RW] +--------+ 1005 _constMethod ----> [ConstMethod: RO] | 1006 _adapter_trampoline --+--->(AdapterHandlerEntry* ptr: RW)-+ 1007 | 1008 +-------------------------------+ 1009 | 1010 +----> [AdapterHandlerEntry] (allocated at run time) 1011 _fingerprint 1012 _c2i_entry ---------------------------------+->[c2i entry..] 1013 _i2i_entry -------------+ _i2c_entry ---------------+-> [i2c entry..] | 1014 _from_interpreted_entry | _c2i_unverified_entry | | 1015 | | | | 1016 | | (_cds_entry_table: CODE) | | 1017 | +->[0]: jmp _entry_table[0] --> (i2i_entry_for "zero_locals") | | 1018 | | (allocated at run time) | | 1019 | | ... [asm code ...] | | 1020 +-[not compiled]-+ [n]: jmp _entry_table[n] | | 1021 | | | 1022 | | | 1023 +-[compiled]-------------------------------------------------------------------+ | 1024 | 1025 _from_compiled_entry------------> (_c2i_entry_trampoline: CODE) | 1026 [jmp c2i_entry] ------------------------------------------------------+ 1027 1028 ***/ 1029 1030 // Called when the method_holder is getting linked. Setup entrypoints so the method 1031 // is ready to be called from interpreter, compiler, and vtables. 1032 void Method::link_method(const methodHandle& h_method, TRAPS) { 1033 // If the code cache is full, we may reenter this function for the 1034 // leftover methods that weren't linked. 1035 if (is_shared()) { 1036 address entry = Interpreter::entry_for_cds_method(h_method); 1037 assert(entry != NULL && entry == _i2i_entry, 1038 "should be correctly set during dump time"); 1039 if (adapter() != NULL) { 1040 return; 1041 } 1042 assert(entry == _from_interpreted_entry, 1043 "should be correctly set during dump time"); 1044 } else if (_i2i_entry != NULL) { 1045 return; 1046 } 1047 assert( _code == NULL, "nothing compiled yet" ); 1048 1049 // Setup interpreter entrypoint 1050 assert(this == h_method(), "wrong h_method()" ); 1051 1052 if (!is_shared()) { 1053 assert(adapter() == NULL, "init'd to NULL"); 1054 address entry = Interpreter::entry_for_method(h_method); 1055 assert(entry != NULL, "interpreter entry must be non-null"); 1056 // Sets both _i2i_entry and _from_interpreted_entry 1057 set_interpreter_entry(entry); 1058 } 1059 1060 // Don't overwrite already registered native entries. 1061 if (is_native() && !has_native_function()) { 1062 set_native_function( 1063 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 1064 !native_bind_event_is_interesting); 1065 } 1066 1067 // Setup compiler entrypoint. This is made eagerly, so we do not need 1068 // special handling of vtables. An alternative is to make adapters more 1069 // lazily by calling make_adapter() from from_compiled_entry() for the 1070 // normal calls. For vtable calls life gets more complicated. When a 1071 // call-site goes mega-morphic we need adapters in all methods which can be 1072 // called from the vtable. We need adapters on such methods that get loaded 1073 // later. Ditto for mega-morphic itable calls. If this proves to be a 1074 // problem we'll make these lazily later. 1075 (void) make_adapters(h_method, CHECK); 1076 1077 // ONLY USE the h_method now as make_adapter may have blocked 1078 1079 } 1080 1081 address Method::make_adapters(methodHandle mh, TRAPS) { 1082 // Adapters for compiled code are made eagerly here. They are fairly 1083 // small (generally < 100 bytes) and quick to make (and cached and shared) 1084 // so making them eagerly shouldn't be too expensive. 1085 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 1086 if (adapter == NULL ) { 1087 if (!is_init_completed()) { 1088 // Don't throw exceptions during VM initialization because java.lang.* classes 1089 // might not have been initialized, causing problems when constructing the 1090 // Java exception object. 1091 vm_exit_during_initialization("Out of space in CodeCache for adapters"); 1092 } else { 1093 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for adapters"); 1094 } 1095 } 1096 1097 if (mh->is_shared()) { 1098 assert(mh->adapter() == adapter, "must be"); 1099 assert(mh->_from_compiled_entry != NULL, "must be"); 1100 } else { 1101 mh->set_adapter_entry(adapter); 1102 mh->_from_compiled_entry = adapter->get_c2i_entry(); 1103 } 1104 return adapter->get_c2i_entry(); 1105 } 1106 1107 void Method::restore_unshareable_info(TRAPS) { 1108 assert(is_method() && is_valid_method(), "ensure C++ vtable is restored"); 1109 1110 // Since restore_unshareable_info can be called more than once for a method, don't 1111 // redo any work. 1112 if (adapter() == NULL) { 1113 methodHandle mh(THREAD, this); 1114 link_method(mh, CHECK); 1115 } 1116 } 1117 1118 volatile address Method::from_compiled_entry_no_trampoline() const { 1119 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 1120 if (code) { 1121 return code->verified_entry_point(); 1122 } else { 1123 return adapter()->get_c2i_entry(); 1124 } 1125 } 1126 1127 // The verified_code_entry() must be called when a invoke is resolved 1128 // on this method. 1129 1130 // It returns the compiled code entry point, after asserting not null. 1131 // This function is called after potential safepoints so that nmethod 1132 // or adapter that it points to is still live and valid. 1133 // This function must not hit a safepoint! 1134 address Method::verified_code_entry() { 1135 debug_only(NoSafepointVerifier nsv;) 1136 assert(_from_compiled_entry != NULL, "must be set"); 1137 return _from_compiled_entry; 1138 } 1139 1140 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 1141 // (could be racing a deopt). 1142 // Not inline to avoid circular ref. 1143 bool Method::check_code() const { 1144 // cached in a register or local. There's a race on the value of the field. 1145 CompiledMethod *code = (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code); 1146 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); 1147 } 1148 1149 // Install compiled code. Instantly it can execute. 1150 void Method::set_code(methodHandle mh, CompiledMethod *code) { 1151 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1152 assert( code, "use clear_code to remove code" ); 1153 assert( mh->check_code(), "" ); 1154 1155 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 1156 1157 // These writes must happen in this order, because the interpreter will 1158 // directly jump to from_interpreted_entry which jumps to an i2c adapter 1159 // which jumps to _from_compiled_entry. 1160 mh->_code = code; // Assign before allowing compiled code to exec 1161 1162 int comp_level = code->comp_level(); 1163 // In theory there could be a race here. In practice it is unlikely 1164 // and not worth worrying about. 1165 if (comp_level > mh->highest_comp_level()) { 1166 mh->set_highest_comp_level(comp_level); 1167 } 1168 1169 OrderAccess::storestore(); 1170 #ifdef SHARK 1171 mh->_from_interpreted_entry = code->insts_begin(); 1172 #else //!SHARK 1173 mh->_from_compiled_entry = code->verified_entry_point(); 1174 OrderAccess::storestore(); 1175 // Instantly compiled code can execute. 1176 if (!mh->is_method_handle_intrinsic()) 1177 mh->_from_interpreted_entry = mh->get_i2c_entry(); 1178 #endif //!SHARK 1179 } 1180 1181 1182 bool Method::is_overridden_in(Klass* k) const { 1183 InstanceKlass* ik = InstanceKlass::cast(k); 1184 1185 if (ik->is_interface()) return false; 1186 1187 // If method is an interface, we skip it - except if it 1188 // is a miranda method 1189 if (method_holder()->is_interface()) { 1190 // Check that method is not a miranda method 1191 if (ik->lookup_method(name(), signature()) == NULL) { 1192 // No implementation exist - so miranda method 1193 return false; 1194 } 1195 return true; 1196 } 1197 1198 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 1199 if (!has_vtable_index()) { 1200 return false; 1201 } else { 1202 Method* vt_m = ik->method_at_vtable(vtable_index()); 1203 return vt_m != this; 1204 } 1205 } 1206 1207 1208 // give advice about whether this Method* should be cached or not 1209 bool Method::should_not_be_cached() const { 1210 if (is_old()) { 1211 // This method has been redefined. It is either EMCP or obsolete 1212 // and we don't want to cache it because that would pin the method 1213 // down and prevent it from being collectible if and when it 1214 // finishes executing. 1215 return true; 1216 } 1217 1218 // caching this method should be just fine 1219 return false; 1220 } 1221 1222 1223 /** 1224 * Returns true if this is one of the specially treated methods for 1225 * security related stack walks (like Reflection.getCallerClass). 1226 */ 1227 bool Method::is_ignored_by_security_stack_walk() const { 1228 if (intrinsic_id() == vmIntrinsics::_invoke) { 1229 // This is Method.invoke() -- ignore it 1230 return true; 1231 } 1232 if (method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { 1233 // This is an auxilary frame -- ignore it 1234 return true; 1235 } 1236 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { 1237 // This is an internal adapter frame for method handles -- ignore it 1238 return true; 1239 } 1240 return false; 1241 } 1242 1243 1244 // Constant pool structure for invoke methods: 1245 enum { 1246 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 1247 _imcp_invoke_signature, // utf8: (variable Symbol*) 1248 _imcp_limit 1249 }; 1250 1251 // Test if this method is an MH adapter frame generated by Java code. 1252 // Cf. java/lang/invoke/InvokerBytecodeGenerator 1253 bool Method::is_compiled_lambda_form() const { 1254 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 1255 } 1256 1257 // Test if this method is an internal MH primitive method. 1258 bool Method::is_method_handle_intrinsic() const { 1259 vmIntrinsics::ID iid = intrinsic_id(); 1260 return (MethodHandles::is_signature_polymorphic(iid) && 1261 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 1262 } 1263 1264 bool Method::has_member_arg() const { 1265 vmIntrinsics::ID iid = intrinsic_id(); 1266 return (MethodHandles::is_signature_polymorphic(iid) && 1267 MethodHandles::has_member_arg(iid)); 1268 } 1269 1270 // Make an instance of a signature-polymorphic internal MH primitive. 1271 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, 1272 Symbol* signature, 1273 TRAPS) { 1274 ResourceMark rm; 1275 methodHandle empty; 1276 1277 InstanceKlass* holder = SystemDictionary::MethodHandle_klass(); 1278 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 1279 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 1280 if (TraceMethodHandles) { 1281 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 1282 } 1283 1284 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 1285 name->increment_refcount(); 1286 signature->increment_refcount(); 1287 1288 int cp_length = _imcp_limit; 1289 ClassLoaderData* loader_data = holder->class_loader_data(); 1290 constantPoolHandle cp; 1291 { 1292 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); 1293 cp = constantPoolHandle(THREAD, cp_oop); 1294 } 1295 cp->set_pool_holder(holder); 1296 cp->symbol_at_put(_imcp_invoke_name, name); 1297 cp->symbol_at_put(_imcp_invoke_signature, signature); 1298 cp->set_has_preresolution(); 1299 1300 // decide on access bits: public or not? 1301 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 1302 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 1303 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 1304 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 1305 1306 methodHandle m; 1307 { 1308 InlineTableSizes sizes; 1309 Method* m_oop = Method::allocate(loader_data, 0, 1310 accessFlags_from(flags_bits), &sizes, 1311 ConstMethod::NORMAL, CHECK_(empty)); 1312 m = methodHandle(THREAD, m_oop); 1313 } 1314 m->set_constants(cp()); 1315 m->set_name_index(_imcp_invoke_name); 1316 m->set_signature_index(_imcp_invoke_signature); 1317 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 1318 assert(m->signature() == signature, ""); 1319 ResultTypeFinder rtf(signature); 1320 m->constMethod()->set_result_type(rtf.type()); 1321 m->compute_size_of_parameters(THREAD); 1322 m->init_intrinsic_id(); 1323 assert(m->is_method_handle_intrinsic(), ""); 1324 #ifdef ASSERT 1325 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 1326 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 1327 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 1328 #endif //ASSERT 1329 1330 // Finally, set up its entry points. 1331 assert(m->can_be_statically_bound(), ""); 1332 m->set_vtable_index(Method::nonvirtual_vtable_index); 1333 m->link_method(m, CHECK_(empty)); 1334 1335 if (TraceMethodHandles && (Verbose || WizardMode)) { 1336 ttyLocker ttyl; 1337 m->print_on(tty); 1338 } 1339 1340 return m; 1341 } 1342 1343 Klass* Method::check_non_bcp_klass(Klass* klass) { 1344 if (klass != NULL && klass->class_loader() != NULL) { 1345 if (klass->is_objArray_klass()) 1346 klass = ObjArrayKlass::cast(klass)->bottom_klass(); 1347 return klass; 1348 } 1349 return NULL; 1350 } 1351 1352 1353 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1354 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1355 // Code below does not work for native methods - they should never get rewritten anyway 1356 assert(!m->is_native(), "cannot rewrite native methods"); 1357 // Allocate new Method* 1358 AccessFlags flags = m->access_flags(); 1359 1360 ConstMethod* cm = m->constMethod(); 1361 int checked_exceptions_len = cm->checked_exceptions_length(); 1362 int localvariable_len = cm->localvariable_table_length(); 1363 int exception_table_len = cm->exception_table_length(); 1364 int method_parameters_len = cm->method_parameters_length(); 1365 int method_annotations_len = cm->method_annotations_length(); 1366 int parameter_annotations_len = cm->parameter_annotations_length(); 1367 int type_annotations_len = cm->type_annotations_length(); 1368 int default_annotations_len = cm->default_annotations_length(); 1369 1370 InlineTableSizes sizes( 1371 localvariable_len, 1372 new_compressed_linenumber_size, 1373 exception_table_len, 1374 checked_exceptions_len, 1375 method_parameters_len, 1376 cm->generic_signature_index(), 1377 method_annotations_len, 1378 parameter_annotations_len, 1379 type_annotations_len, 1380 default_annotations_len, 1381 0); 1382 1383 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); 1384 Method* newm_oop = Method::allocate(loader_data, 1385 new_code_length, 1386 flags, 1387 &sizes, 1388 m->method_type(), 1389 CHECK_(methodHandle())); 1390 methodHandle newm (THREAD, newm_oop); 1391 1392 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* 1393 ConstMethod* newcm = newm->constMethod(); 1394 int new_const_method_size = newm->constMethod()->size(); 1395 1396 // This works because the source and target are both Methods. Some compilers 1397 // (e.g., clang) complain that the target vtable pointer will be stomped, 1398 // so cast away newm()'s and m()'s Methodness. 1399 memcpy((void*)newm(), (void*)m(), sizeof(Method)); 1400 1401 // Create shallow copy of ConstMethod. 1402 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); 1403 1404 // Reset correct method/const method, method size, and parameter info 1405 newm->set_constMethod(newcm); 1406 newm->constMethod()->set_code_size(new_code_length); 1407 newm->constMethod()->set_constMethod_size(new_const_method_size); 1408 assert(newm->code_size() == new_code_length, "check"); 1409 assert(newm->method_parameters_length() == method_parameters_len, "check"); 1410 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1411 assert(newm->exception_table_length() == exception_table_len, "check"); 1412 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1413 // Copy new byte codes 1414 memcpy(newm->code_base(), new_code, new_code_length); 1415 // Copy line number table 1416 if (new_compressed_linenumber_size > 0) { 1417 memcpy(newm->compressed_linenumber_table(), 1418 new_compressed_linenumber_table, 1419 new_compressed_linenumber_size); 1420 } 1421 // Copy method_parameters 1422 if (method_parameters_len > 0) { 1423 memcpy(newm->method_parameters_start(), 1424 m->method_parameters_start(), 1425 method_parameters_len * sizeof(MethodParametersElement)); 1426 } 1427 // Copy checked_exceptions 1428 if (checked_exceptions_len > 0) { 1429 memcpy(newm->checked_exceptions_start(), 1430 m->checked_exceptions_start(), 1431 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1432 } 1433 // Copy exception table 1434 if (exception_table_len > 0) { 1435 memcpy(newm->exception_table_start(), 1436 m->exception_table_start(), 1437 exception_table_len * sizeof(ExceptionTableElement)); 1438 } 1439 // Copy local variable number table 1440 if (localvariable_len > 0) { 1441 memcpy(newm->localvariable_table_start(), 1442 m->localvariable_table_start(), 1443 localvariable_len * sizeof(LocalVariableTableElement)); 1444 } 1445 // Copy stackmap table 1446 if (m->has_stackmap_table()) { 1447 int code_attribute_length = m->stackmap_data()->length(); 1448 Array<u1>* stackmap_data = 1449 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); 1450 memcpy((void*)stackmap_data->adr_at(0), 1451 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); 1452 newm->set_stackmap_data(stackmap_data); 1453 } 1454 1455 // copy annotations over to new method 1456 newcm->copy_annotations_from(loader_data, cm, CHECK_NULL); 1457 return newm; 1458 } 1459 1460 vmSymbols::SID Method::klass_id_for_intrinsics(const Klass* holder) { 1461 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1462 // because we are not loading from core libraries 1463 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1464 // which does not use the class default class loader so we check for its loader here 1465 const InstanceKlass* ik = InstanceKlass::cast(holder); 1466 if ((ik->class_loader() != NULL) && !SystemDictionary::is_platform_class_loader(ik->class_loader())) { 1467 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1468 } 1469 1470 // see if the klass name is well-known: 1471 Symbol* klass_name = ik->name(); 1472 return vmSymbols::find_sid(klass_name); 1473 } 1474 1475 void Method::init_intrinsic_id() { 1476 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1477 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1478 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1479 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1480 1481 // the klass name is well-known: 1482 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1483 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1484 1485 // ditto for method and signature: 1486 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1487 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1488 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1489 && name_id == vmSymbols::NO_SID) { 1490 return; 1491 } 1492 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1493 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1494 && klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle) 1495 && sig_id == vmSymbols::NO_SID) { 1496 return; 1497 } 1498 jshort flags = access_flags().as_short(); 1499 1500 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1501 if (id != vmIntrinsics::_none) { 1502 set_intrinsic_id(id); 1503 if (id == vmIntrinsics::_Class_cast) { 1504 // Even if the intrinsic is rejected, we want to inline this simple method. 1505 set_force_inline(true); 1506 } 1507 return; 1508 } 1509 1510 // A few slightly irregular cases: 1511 switch (klass_id) { 1512 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1513 // Second chance: check in regular Math. 1514 switch (name_id) { 1515 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1516 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1517 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1518 // pretend it is the corresponding method in the non-strict class: 1519 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1520 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1521 break; 1522 default: 1523 break; 1524 } 1525 break; 1526 1527 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*., VarHandle 1528 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1529 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_VarHandle): 1530 if (!is_native()) break; 1531 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1532 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1533 id = vmIntrinsics::_none; 1534 break; 1535 1536 default: 1537 break; 1538 } 1539 1540 if (id != vmIntrinsics::_none) { 1541 // Set up its iid. It is an alias method. 1542 set_intrinsic_id(id); 1543 return; 1544 } 1545 } 1546 1547 // These two methods are static since a GC may move the Method 1548 bool Method::load_signature_classes(methodHandle m, TRAPS) { 1549 if (!THREAD->can_call_java()) { 1550 // There is nothing useful this routine can do from within the Compile thread. 1551 // Hopefully, the signature contains only well-known classes. 1552 // We could scan for this and return true/false, but the caller won't care. 1553 return false; 1554 } 1555 bool sig_is_loaded = true; 1556 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1557 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1558 ResourceMark rm(THREAD); 1559 Symbol* signature = m->signature(); 1560 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1561 if (ss.is_object()) { 1562 Symbol* sym = ss.as_symbol(CHECK_(false)); 1563 Symbol* name = sym; 1564 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, 1565 protection_domain, THREAD); 1566 // We are loading classes eagerly. If a ClassNotFoundException or 1567 // a LinkageError was generated, be sure to ignore it. 1568 if (HAS_PENDING_EXCEPTION) { 1569 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1570 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1571 CLEAR_PENDING_EXCEPTION; 1572 } else { 1573 return false; 1574 } 1575 } 1576 if( klass == NULL) { sig_is_loaded = false; } 1577 } 1578 } 1579 return sig_is_loaded; 1580 } 1581 1582 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1583 Handle class_loader(THREAD, m->method_holder()->class_loader()); 1584 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); 1585 ResourceMark rm(THREAD); 1586 Symbol* signature = m->signature(); 1587 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1588 if (ss.type() == T_OBJECT) { 1589 Symbol* name = ss.as_symbol_or_null(); 1590 if (name == NULL) return true; 1591 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1592 if (klass == NULL) return true; 1593 } 1594 } 1595 return false; 1596 } 1597 1598 // Exposed so field engineers can debug VM 1599 void Method::print_short_name(outputStream* st) { 1600 ResourceMark rm; 1601 #ifdef PRODUCT 1602 st->print(" %s::", method_holder()->external_name()); 1603 #else 1604 st->print(" %s::", method_holder()->internal_name()); 1605 #endif 1606 name()->print_symbol_on(st); 1607 if (WizardMode) signature()->print_symbol_on(st); 1608 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1609 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1610 } 1611 1612 // Comparer for sorting an object array containing 1613 // Method*s. 1614 static int method_comparator(Method* a, Method* b) { 1615 return a->name()->fast_compare(b->name()); 1616 } 1617 1618 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1619 // default_methods also uses this without the ordering for fast find_method 1620 void Method::sort_methods(Array<Method*>* methods, bool idempotent, bool set_idnums) { 1621 int length = methods->length(); 1622 if (length > 1) { 1623 { 1624 NoSafepointVerifier nsv; 1625 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); 1626 } 1627 // Reset method ordering 1628 if (set_idnums) { 1629 for (int i = 0; i < length; i++) { 1630 Method* m = methods->at(i); 1631 m->set_method_idnum(i); 1632 m->set_orig_method_idnum(i); 1633 } 1634 } 1635 } 1636 } 1637 1638 //----------------------------------------------------------------------------------- 1639 // Non-product code unless JVM/TI needs it 1640 1641 #if !defined(PRODUCT) || INCLUDE_JVMTI 1642 class SignatureTypePrinter : public SignatureTypeNames { 1643 private: 1644 outputStream* _st; 1645 bool _use_separator; 1646 1647 void type_name(const char* name) { 1648 if (_use_separator) _st->print(", "); 1649 _st->print("%s", name); 1650 _use_separator = true; 1651 } 1652 1653 public: 1654 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1655 _st = st; 1656 _use_separator = false; 1657 } 1658 1659 void print_parameters() { _use_separator = false; iterate_parameters(); } 1660 void print_returntype() { _use_separator = false; iterate_returntype(); } 1661 }; 1662 1663 1664 void Method::print_name(outputStream* st) { 1665 Thread *thread = Thread::current(); 1666 ResourceMark rm(thread); 1667 st->print("%s ", is_static() ? "static" : "virtual"); 1668 if (WizardMode) { 1669 st->print("%s.", method_holder()->internal_name()); 1670 name()->print_symbol_on(st); 1671 signature()->print_symbol_on(st); 1672 } else { 1673 SignatureTypePrinter sig(signature(), st); 1674 sig.print_returntype(); 1675 st->print(" %s.", method_holder()->internal_name()); 1676 name()->print_symbol_on(st); 1677 st->print("("); 1678 sig.print_parameters(); 1679 st->print(")"); 1680 } 1681 } 1682 #endif // !PRODUCT || INCLUDE_JVMTI 1683 1684 1685 void Method::print_codes_on(outputStream* st) const { 1686 print_codes_on(0, code_size(), st); 1687 } 1688 1689 void Method::print_codes_on(int from, int to, outputStream* st) const { 1690 Thread *thread = Thread::current(); 1691 ResourceMark rm(thread); 1692 methodHandle mh (thread, (Method*)this); 1693 BytecodeStream s(mh); 1694 s.set_interval(from, to); 1695 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1696 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1697 } 1698 1699 1700 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1701 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1702 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1703 // as end-of-stream terminator. 1704 1705 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1706 // bci and line number does not compress into single byte. 1707 // Write out escape character and use regular compression for bci and line number. 1708 write_byte((jubyte)0xFF); 1709 write_signed_int(bci_delta); 1710 write_signed_int(line_delta); 1711 } 1712 1713 // See comment in method.hpp which explains why this exists. 1714 #if defined(_M_AMD64) && _MSC_VER >= 1400 1715 #pragma optimize("", off) 1716 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1717 write_pair_inline(bci, line); 1718 } 1719 #pragma optimize("", on) 1720 #endif 1721 1722 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1723 _bci = 0; 1724 _line = 0; 1725 }; 1726 1727 1728 bool CompressedLineNumberReadStream::read_pair() { 1729 jubyte next = read_byte(); 1730 // Check for terminator 1731 if (next == 0) return false; 1732 if (next == 0xFF) { 1733 // Escape character, regular compression used 1734 _bci += read_signed_int(); 1735 _line += read_signed_int(); 1736 } else { 1737 // Single byte compression used 1738 _bci += next >> 3; 1739 _line += next & 0x7; 1740 } 1741 return true; 1742 } 1743 1744 #if INCLUDE_JVMTI 1745 1746 Bytecodes::Code Method::orig_bytecode_at(int bci) const { 1747 BreakpointInfo* bp = method_holder()->breakpoints(); 1748 for (; bp != NULL; bp = bp->next()) { 1749 if (bp->match(this, bci)) { 1750 return bp->orig_bytecode(); 1751 } 1752 } 1753 { 1754 ResourceMark rm; 1755 fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci); 1756 } 1757 return Bytecodes::_shouldnotreachhere; 1758 } 1759 1760 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1761 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1762 BreakpointInfo* bp = method_holder()->breakpoints(); 1763 for (; bp != NULL; bp = bp->next()) { 1764 if (bp->match(this, bci)) { 1765 bp->set_orig_bytecode(code); 1766 // and continue, in case there is more than one 1767 } 1768 } 1769 } 1770 1771 void Method::set_breakpoint(int bci) { 1772 InstanceKlass* ik = method_holder(); 1773 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1774 bp->set_next(ik->breakpoints()); 1775 ik->set_breakpoints(bp); 1776 // do this last: 1777 bp->set(this); 1778 } 1779 1780 static void clear_matches(Method* m, int bci) { 1781 InstanceKlass* ik = m->method_holder(); 1782 BreakpointInfo* prev_bp = NULL; 1783 BreakpointInfo* next_bp; 1784 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1785 next_bp = bp->next(); 1786 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1787 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1788 // do this first: 1789 bp->clear(m); 1790 // unhook it 1791 if (prev_bp != NULL) 1792 prev_bp->set_next(next_bp); 1793 else 1794 ik->set_breakpoints(next_bp); 1795 delete bp; 1796 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1797 // at same location. So we have multiple matching (method_index and bci) 1798 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1799 // breakpoint for clear_breakpoint request and keep all other method versions 1800 // BreakpointInfo for future clear_breakpoint request. 1801 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1802 // which is being called when class is unloaded. We delete all the Breakpoint 1803 // information for all versions of method. We may not correctly restore the original 1804 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1805 // so these methods won't be used anymore. 1806 if (bci >= 0) { 1807 break; 1808 } 1809 } else { 1810 // This one is a keeper. 1811 prev_bp = bp; 1812 } 1813 } 1814 } 1815 1816 void Method::clear_breakpoint(int bci) { 1817 assert(bci >= 0, ""); 1818 clear_matches(this, bci); 1819 } 1820 1821 void Method::clear_all_breakpoints() { 1822 clear_matches(this, -1); 1823 } 1824 1825 #endif // INCLUDE_JVMTI 1826 1827 int Method::invocation_count() { 1828 MethodCounters *mcs = method_counters(); 1829 if (TieredCompilation) { 1830 MethodData* const mdo = method_data(); 1831 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || 1832 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1833 return InvocationCounter::count_limit; 1834 } else { 1835 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + 1836 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1837 } 1838 } else { 1839 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); 1840 } 1841 } 1842 1843 int Method::backedge_count() { 1844 MethodCounters *mcs = method_counters(); 1845 if (TieredCompilation) { 1846 MethodData* const mdo = method_data(); 1847 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || 1848 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1849 return InvocationCounter::count_limit; 1850 } else { 1851 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + 1852 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1853 } 1854 } else { 1855 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); 1856 } 1857 } 1858 1859 int Method::highest_comp_level() const { 1860 const MethodCounters* mcs = method_counters(); 1861 if (mcs != NULL) { 1862 return mcs->highest_comp_level(); 1863 } else { 1864 return CompLevel_none; 1865 } 1866 } 1867 1868 int Method::highest_osr_comp_level() const { 1869 const MethodCounters* mcs = method_counters(); 1870 if (mcs != NULL) { 1871 return mcs->highest_osr_comp_level(); 1872 } else { 1873 return CompLevel_none; 1874 } 1875 } 1876 1877 void Method::set_highest_comp_level(int level) { 1878 MethodCounters* mcs = method_counters(); 1879 if (mcs != NULL) { 1880 mcs->set_highest_comp_level(level); 1881 } 1882 } 1883 1884 void Method::set_highest_osr_comp_level(int level) { 1885 MethodCounters* mcs = method_counters(); 1886 if (mcs != NULL) { 1887 mcs->set_highest_osr_comp_level(level); 1888 } 1889 } 1890 1891 #if INCLUDE_JVMTI 1892 1893 BreakpointInfo::BreakpointInfo(Method* m, int bci) { 1894 _bci = bci; 1895 _name_index = m->name_index(); 1896 _signature_index = m->signature_index(); 1897 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1898 if (_orig_bytecode == Bytecodes::_breakpoint) 1899 _orig_bytecode = m->orig_bytecode_at(_bci); 1900 _next = NULL; 1901 } 1902 1903 void BreakpointInfo::set(Method* method) { 1904 #ifdef ASSERT 1905 { 1906 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1907 if (code == Bytecodes::_breakpoint) 1908 code = method->orig_bytecode_at(_bci); 1909 assert(orig_bytecode() == code, "original bytecode must be the same"); 1910 } 1911 #endif 1912 Thread *thread = Thread::current(); 1913 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1914 method->incr_number_of_breakpoints(thread); 1915 SystemDictionary::notice_modification(); 1916 { 1917 // Deoptimize all dependents on this method 1918 HandleMark hm(thread); 1919 methodHandle mh(thread, method); 1920 CodeCache::flush_dependents_on_method(mh); 1921 } 1922 } 1923 1924 void BreakpointInfo::clear(Method* method) { 1925 *method->bcp_from(_bci) = orig_bytecode(); 1926 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1927 method->decr_number_of_breakpoints(Thread::current()); 1928 } 1929 1930 #endif // INCLUDE_JVMTI 1931 1932 // jmethodID handling 1933 1934 // This is a block allocating object, sort of like JNIHandleBlock, only a 1935 // lot simpler. 1936 // It's allocated on the CHeap because once we allocate a jmethodID, we can 1937 // never get rid of it. 1938 1939 static const int min_block_size = 8; 1940 1941 class JNIMethodBlockNode : public CHeapObj<mtClass> { 1942 friend class JNIMethodBlock; 1943 Method** _methods; 1944 int _number_of_methods; 1945 int _top; 1946 JNIMethodBlockNode* _next; 1947 1948 public: 1949 1950 JNIMethodBlockNode(int num_methods = min_block_size); 1951 1952 ~JNIMethodBlockNode() { FREE_C_HEAP_ARRAY(Method*, _methods); } 1953 1954 void ensure_methods(int num_addl_methods) { 1955 if (_top < _number_of_methods) { 1956 num_addl_methods -= _number_of_methods - _top; 1957 if (num_addl_methods <= 0) { 1958 return; 1959 } 1960 } 1961 if (_next == NULL) { 1962 _next = new JNIMethodBlockNode(MAX2(num_addl_methods, min_block_size)); 1963 } else { 1964 _next->ensure_methods(num_addl_methods); 1965 } 1966 } 1967 }; 1968 1969 class JNIMethodBlock : public CHeapObj<mtClass> { 1970 JNIMethodBlockNode _head; 1971 JNIMethodBlockNode *_last_free; 1972 public: 1973 static Method* const _free_method; 1974 1975 JNIMethodBlock(int initial_capacity = min_block_size) 1976 : _head(initial_capacity), _last_free(&_head) {} 1977 1978 void ensure_methods(int num_addl_methods) { 1979 _last_free->ensure_methods(num_addl_methods); 1980 } 1981 1982 Method** add_method(Method* m) { 1983 for (JNIMethodBlockNode* b = _last_free; b != NULL; b = b->_next) { 1984 if (b->_top < b->_number_of_methods) { 1985 // top points to the next free entry. 1986 int i = b->_top; 1987 b->_methods[i] = m; 1988 b->_top++; 1989 _last_free = b; 1990 return &(b->_methods[i]); 1991 } else if (b->_top == b->_number_of_methods) { 1992 // if the next free entry ran off the block see if there's a free entry 1993 for (int i = 0; i < b->_number_of_methods; i++) { 1994 if (b->_methods[i] == _free_method) { 1995 b->_methods[i] = m; 1996 _last_free = b; 1997 return &(b->_methods[i]); 1998 } 1999 } 2000 // Only check each block once for frees. They're very unlikely. 2001 // Increment top past the end of the block. 2002 b->_top++; 2003 } 2004 // need to allocate a next block. 2005 if (b->_next == NULL) { 2006 b->_next = _last_free = new JNIMethodBlockNode(); 2007 } 2008 } 2009 guarantee(false, "Should always allocate a free block"); 2010 return NULL; 2011 } 2012 2013 bool contains(Method** m) { 2014 if (m == NULL) return false; 2015 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2016 if (b->_methods <= m && m < b->_methods + b->_number_of_methods) { 2017 // This is a bit of extra checking, for two reasons. One is 2018 // that contains() deals with pointers that are passed in by 2019 // JNI code, so making sure that the pointer is aligned 2020 // correctly is valuable. The other is that <= and > are 2021 // technically not defined on pointers, so the if guard can 2022 // pass spuriously; no modern compiler is likely to make that 2023 // a problem, though (and if one did, the guard could also 2024 // fail spuriously, which would be bad). 2025 ptrdiff_t idx = m - b->_methods; 2026 if (b->_methods + idx == m) { 2027 return true; 2028 } 2029 } 2030 } 2031 return false; // not found 2032 } 2033 2034 // Doesn't really destroy it, just marks it as free so it can be reused. 2035 void destroy_method(Method** m) { 2036 #ifdef ASSERT 2037 assert(contains(m), "should be a methodID"); 2038 #endif // ASSERT 2039 *m = _free_method; 2040 } 2041 2042 // During class unloading the methods are cleared, which is different 2043 // than freed. 2044 void clear_all_methods() { 2045 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2046 for (int i = 0; i< b->_number_of_methods; i++) { 2047 b->_methods[i] = NULL; 2048 } 2049 } 2050 } 2051 #ifndef PRODUCT 2052 int count_methods() { 2053 // count all allocated methods 2054 int count = 0; 2055 for (JNIMethodBlockNode* b = &_head; b != NULL; b = b->_next) { 2056 for (int i = 0; i< b->_number_of_methods; i++) { 2057 if (b->_methods[i] != _free_method) count++; 2058 } 2059 } 2060 return count; 2061 } 2062 #endif // PRODUCT 2063 }; 2064 2065 // Something that can't be mistaken for an address or a markOop 2066 Method* const JNIMethodBlock::_free_method = (Method*)55; 2067 2068 JNIMethodBlockNode::JNIMethodBlockNode(int num_methods) : _next(NULL), _top(0) { 2069 _number_of_methods = MAX2(num_methods, min_block_size); 2070 _methods = NEW_C_HEAP_ARRAY(Method*, _number_of_methods, mtInternal); 2071 for (int i = 0; i < _number_of_methods; i++) { 2072 _methods[i] = JNIMethodBlock::_free_method; 2073 } 2074 } 2075 2076 void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) { 2077 ClassLoaderData* cld = loader_data; 2078 if (!SafepointSynchronize::is_at_safepoint()) { 2079 // Have to add jmethod_ids() to class loader data thread-safely. 2080 // Also have to add the method to the list safely, which the cld lock 2081 // protects as well. 2082 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2083 if (cld->jmethod_ids() == NULL) { 2084 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2085 } else { 2086 cld->jmethod_ids()->ensure_methods(capacity); 2087 } 2088 } else { 2089 // At safepoint, we are single threaded and can set this. 2090 if (cld->jmethod_ids() == NULL) { 2091 cld->set_jmethod_ids(new JNIMethodBlock(capacity)); 2092 } else { 2093 cld->jmethod_ids()->ensure_methods(capacity); 2094 } 2095 } 2096 } 2097 2098 // Add a method id to the jmethod_ids 2099 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { 2100 ClassLoaderData* cld = loader_data; 2101 2102 if (!SafepointSynchronize::is_at_safepoint()) { 2103 // Have to add jmethod_ids() to class loader data thread-safely. 2104 // Also have to add the method to the list safely, which the cld lock 2105 // protects as well. 2106 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); 2107 if (cld->jmethod_ids() == NULL) { 2108 cld->set_jmethod_ids(new JNIMethodBlock()); 2109 } 2110 // jmethodID is a pointer to Method* 2111 return (jmethodID)cld->jmethod_ids()->add_method(m); 2112 } else { 2113 // At safepoint, we are single threaded and can set this. 2114 if (cld->jmethod_ids() == NULL) { 2115 cld->set_jmethod_ids(new JNIMethodBlock()); 2116 } 2117 // jmethodID is a pointer to Method* 2118 return (jmethodID)cld->jmethod_ids()->add_method(m); 2119 } 2120 } 2121 2122 // Mark a jmethodID as free. This is called when there is a data race in 2123 // InstanceKlass while creating the jmethodID cache. 2124 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { 2125 ClassLoaderData* cld = loader_data; 2126 Method** ptr = (Method**)m; 2127 assert(cld->jmethod_ids() != NULL, "should have method handles"); 2128 cld->jmethod_ids()->destroy_method(ptr); 2129 } 2130 2131 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { 2132 // Can't assert the method_holder is the same because the new method has the 2133 // scratch method holder. 2134 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() 2135 == new_method->method_holder()->class_loader(), 2136 "changing to a different class loader"); 2137 // Just change the method in place, jmethodID pointer doesn't change. 2138 *((Method**)jmid) = new_method; 2139 } 2140 2141 bool Method::is_method_id(jmethodID mid) { 2142 Method* m = resolve_jmethod_id(mid); 2143 assert(m != NULL, "should be called with non-null method"); 2144 InstanceKlass* ik = m->method_holder(); 2145 ClassLoaderData* cld = ik->class_loader_data(); 2146 if (cld->jmethod_ids() == NULL) return false; 2147 return (cld->jmethod_ids()->contains((Method**)mid)); 2148 } 2149 2150 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { 2151 if (mid == NULL) return NULL; 2152 Method* o = resolve_jmethod_id(mid); 2153 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { 2154 return NULL; 2155 } 2156 return o; 2157 }; 2158 2159 void Method::set_on_stack(const bool value) { 2160 // Set both the method itself and its constant pool. The constant pool 2161 // on stack means some method referring to it is also on the stack. 2162 constants()->set_on_stack(value); 2163 2164 bool already_set = on_stack(); 2165 _access_flags.set_on_stack(value); 2166 if (value && !already_set) { 2167 MetadataOnStackMark::record(this); 2168 } 2169 } 2170 2171 // Called when the class loader is unloaded to make all methods weak. 2172 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { 2173 loader_data->jmethod_ids()->clear_all_methods(); 2174 } 2175 2176 bool Method::has_method_vptr(const void* ptr) { 2177 Method m; 2178 // This assumes that the vtbl pointer is the first word of a C++ object. 2179 return dereference_vptr(&m) == dereference_vptr(ptr); 2180 } 2181 2182 // Check that this pointer is valid by checking that the vtbl pointer matches 2183 bool Method::is_valid_method() const { 2184 if (this == NULL) { 2185 return false; 2186 } else if ((intptr_t(this) & (wordSize-1)) != 0) { 2187 // Quick sanity check on pointer. 2188 return false; 2189 } else if (MetaspaceShared::is_in_shared_space(this)) { 2190 return MetaspaceShared::is_valid_shared_method(this); 2191 } else if (Metaspace::contains_non_shared(this)) { 2192 return has_method_vptr((const void*)this); 2193 } else { 2194 return false; 2195 } 2196 } 2197 2198 #ifndef PRODUCT 2199 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { 2200 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); 2201 } 2202 #endif // PRODUCT 2203 2204 2205 // Printing 2206 2207 #ifndef PRODUCT 2208 2209 void Method::print_on(outputStream* st) const { 2210 ResourceMark rm; 2211 assert(is_method(), "must be method"); 2212 st->print_cr("%s", internal_name()); 2213 st->print_cr(" - this oop: " INTPTR_FORMAT, p2i(this)); 2214 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); 2215 st->print (" - constants: " INTPTR_FORMAT " ", p2i(constants())); 2216 constants()->print_value_on(st); st->cr(); 2217 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); 2218 st->print (" - name: "); name()->print_value_on(st); st->cr(); 2219 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); 2220 st->print_cr(" - max stack: %d", max_stack()); 2221 st->print_cr(" - max locals: %d", max_locals()); 2222 st->print_cr(" - size of params: %d", size_of_parameters()); 2223 st->print_cr(" - method size: %d", method_size()); 2224 if (intrinsic_id() != vmIntrinsics::_none) 2225 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); 2226 if (highest_comp_level() != CompLevel_none) 2227 st->print_cr(" - highest level: %d", highest_comp_level()); 2228 st->print_cr(" - vtable index: %d", _vtable_index); 2229 st->print_cr(" - i2i entry: " INTPTR_FORMAT, p2i(interpreter_entry())); 2230 st->print( " - adapters: "); 2231 AdapterHandlerEntry* a = ((Method*)this)->adapter(); 2232 if (a == NULL) 2233 st->print_cr(INTPTR_FORMAT, p2i(a)); 2234 else 2235 a->print_adapter_on(st); 2236 st->print_cr(" - compiled entry " INTPTR_FORMAT, p2i(from_compiled_entry())); 2237 st->print_cr(" - code size: %d", code_size()); 2238 if (code_size() != 0) { 2239 st->print_cr(" - code start: " INTPTR_FORMAT, p2i(code_base())); 2240 st->print_cr(" - code end (excl): " INTPTR_FORMAT, p2i(code_base() + code_size())); 2241 } 2242 if (method_data() != NULL) { 2243 st->print_cr(" - method data: " INTPTR_FORMAT, p2i(method_data())); 2244 } 2245 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); 2246 if (checked_exceptions_length() > 0) { 2247 CheckedExceptionElement* table = checked_exceptions_start(); 2248 st->print_cr(" - checked ex start: " INTPTR_FORMAT, p2i(table)); 2249 if (Verbose) { 2250 for (int i = 0; i < checked_exceptions_length(); i++) { 2251 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); 2252 } 2253 } 2254 } 2255 if (has_linenumber_table()) { 2256 u_char* table = compressed_linenumber_table(); 2257 st->print_cr(" - linenumber start: " INTPTR_FORMAT, p2i(table)); 2258 if (Verbose) { 2259 CompressedLineNumberReadStream stream(table); 2260 while (stream.read_pair()) { 2261 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); 2262 } 2263 } 2264 } 2265 st->print_cr(" - localvar length: %d", localvariable_table_length()); 2266 if (localvariable_table_length() > 0) { 2267 LocalVariableTableElement* table = localvariable_table_start(); 2268 st->print_cr(" - localvar start: " INTPTR_FORMAT, p2i(table)); 2269 if (Verbose) { 2270 for (int i = 0; i < localvariable_table_length(); i++) { 2271 int bci = table[i].start_bci; 2272 int len = table[i].length; 2273 const char* name = constants()->printable_name_at(table[i].name_cp_index); 2274 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); 2275 int slot = table[i].slot; 2276 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); 2277 } 2278 } 2279 } 2280 if (code() != NULL) { 2281 st->print (" - compiled code: "); 2282 code()->print_value_on(st); 2283 } 2284 if (is_native()) { 2285 st->print_cr(" - native function: " INTPTR_FORMAT, p2i(native_function())); 2286 st->print_cr(" - signature handler: " INTPTR_FORMAT, p2i(signature_handler())); 2287 } 2288 } 2289 2290 void Method::print_linkage_flags(outputStream* st) { 2291 access_flags().print_on(st); 2292 if (is_default_method()) { 2293 st->print("default "); 2294 } 2295 if (is_overpass()) { 2296 st->print("overpass "); 2297 } 2298 } 2299 #endif //PRODUCT 2300 2301 void Method::print_value_on(outputStream* st) const { 2302 assert(is_method(), "must be method"); 2303 st->print("%s", internal_name()); 2304 print_address_on(st); 2305 st->print(" "); 2306 name()->print_value_on(st); 2307 st->print(" "); 2308 signature()->print_value_on(st); 2309 st->print(" in "); 2310 method_holder()->print_value_on(st); 2311 if (WizardMode) st->print("#%d", _vtable_index); 2312 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); 2313 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); 2314 } 2315 2316 #if INCLUDE_SERVICES 2317 // Size Statistics 2318 void Method::collect_statistics(KlassSizeStats *sz) const { 2319 int mysize = sz->count(this); 2320 sz->_method_bytes += mysize; 2321 sz->_method_all_bytes += mysize; 2322 sz->_rw_bytes += mysize; 2323 2324 if (constMethod()) { 2325 constMethod()->collect_statistics(sz); 2326 } 2327 if (method_data()) { 2328 method_data()->collect_statistics(sz); 2329 } 2330 } 2331 #endif // INCLUDE_SERVICES 2332 2333 // LogTouchedMethods and PrintTouchedMethods 2334 2335 // TouchedMethodRecord -- we can't use a HashtableEntry<Method*> because 2336 // the Method may be garbage collected. Let's roll our own hash table. 2337 class TouchedMethodRecord : CHeapObj<mtTracing> { 2338 public: 2339 // It's OK to store Symbols here because they will NOT be GC'ed if 2340 // LogTouchedMethods is enabled. 2341 TouchedMethodRecord* _next; 2342 Symbol* _class_name; 2343 Symbol* _method_name; 2344 Symbol* _method_signature; 2345 }; 2346 2347 static const int TOUCHED_METHOD_TABLE_SIZE = 20011; 2348 static TouchedMethodRecord** _touched_method_table = NULL; 2349 2350 void Method::log_touched(TRAPS) { 2351 2352 const int table_size = TOUCHED_METHOD_TABLE_SIZE; 2353 Symbol* my_class = klass_name(); 2354 Symbol* my_name = name(); 2355 Symbol* my_sig = signature(); 2356 2357 unsigned int hash = my_class->identity_hash() + 2358 my_name->identity_hash() + 2359 my_sig->identity_hash(); 2360 juint index = juint(hash) % table_size; 2361 2362 MutexLocker ml(TouchedMethodLog_lock, THREAD); 2363 if (_touched_method_table == NULL) { 2364 _touched_method_table = NEW_C_HEAP_ARRAY2(TouchedMethodRecord*, table_size, 2365 mtTracing, CURRENT_PC); 2366 memset(_touched_method_table, 0, sizeof(TouchedMethodRecord*)*table_size); 2367 } 2368 2369 TouchedMethodRecord* ptr = _touched_method_table[index]; 2370 while (ptr) { 2371 if (ptr->_class_name == my_class && 2372 ptr->_method_name == my_name && 2373 ptr->_method_signature == my_sig) { 2374 return; 2375 } 2376 if (ptr->_next == NULL) break; 2377 ptr = ptr->_next; 2378 } 2379 TouchedMethodRecord* nptr = NEW_C_HEAP_OBJ(TouchedMethodRecord, mtTracing); 2380 my_class->set_permanent(); // prevent reclaimed by GC 2381 my_name->set_permanent(); 2382 my_sig->set_permanent(); 2383 nptr->_class_name = my_class; 2384 nptr->_method_name = my_name; 2385 nptr->_method_signature = my_sig; 2386 nptr->_next = NULL; 2387 2388 if (ptr == NULL) { 2389 // first 2390 _touched_method_table[index] = nptr; 2391 } else { 2392 ptr->_next = nptr; 2393 } 2394 } 2395 2396 void Method::print_touched_methods(outputStream* out) { 2397 MutexLockerEx ml(Thread::current()->is_VM_thread() ? NULL : TouchedMethodLog_lock); 2398 out->print_cr("# Method::print_touched_methods version 1"); 2399 if (_touched_method_table) { 2400 for (int i = 0; i < TOUCHED_METHOD_TABLE_SIZE; i++) { 2401 TouchedMethodRecord* ptr = _touched_method_table[i]; 2402 while(ptr) { 2403 ptr->_class_name->print_symbol_on(out); out->print("."); 2404 ptr->_method_name->print_symbol_on(out); out->print(":"); 2405 ptr->_method_signature->print_symbol_on(out); out->cr(); 2406 ptr = ptr->_next; 2407 } 2408 } 2409 } 2410 } 2411 2412 // Verification 2413 2414 void Method::verify_on(outputStream* st) { 2415 guarantee(is_method(), "object must be method"); 2416 guarantee(constants()->is_constantPool(), "should be constant pool"); 2417 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); 2418 MethodData* md = method_data(); 2419 guarantee(md == NULL || 2420 md->is_methodData(), "should be method data"); 2421 }