1 /* 2 * Copyright (c) 1997, 2012, 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/systemDictionary.hpp" 27 #include "code/debugInfoRec.hpp" 28 #include "gc_interface/collectedHeap.inline.hpp" 29 #include "interpreter/bytecodeStream.hpp" 30 #include "interpreter/bytecodeTracer.hpp" 31 #include "interpreter/bytecodes.hpp" 32 #include "interpreter/interpreter.hpp" 33 #include "interpreter/oopMapCache.hpp" 34 #include "memory/gcLocker.hpp" 35 #include "memory/generation.hpp" 36 #include "memory/oopFactory.hpp" 37 #include "oops/klassOop.hpp" 38 #include "oops/methodDataOop.hpp" 39 #include "oops/methodOop.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "oops/symbol.hpp" 42 #include "prims/jvmtiExport.hpp" 43 #include "prims/methodHandles.hpp" 44 #include "prims/nativeLookup.hpp" 45 #include "runtime/arguments.hpp" 46 #include "runtime/compilationPolicy.hpp" 47 #include "runtime/frame.inline.hpp" 48 #include "runtime/handles.inline.hpp" 49 #include "runtime/relocator.hpp" 50 #include "runtime/sharedRuntime.hpp" 51 #include "runtime/signature.hpp" 52 #include "utilities/quickSort.hpp" 53 #include "utilities/xmlstream.hpp" 54 55 56 // Implementation of methodOopDesc 57 58 address methodOopDesc::get_i2c_entry() { 59 assert(_adapter != NULL, "must have"); 60 return _adapter->get_i2c_entry(); 61 } 62 63 address methodOopDesc::get_c2i_entry() { 64 assert(_adapter != NULL, "must have"); 65 return _adapter->get_c2i_entry(); 66 } 67 68 address methodOopDesc::get_c2i_unverified_entry() { 69 assert(_adapter != NULL, "must have"); 70 return _adapter->get_c2i_unverified_entry(); 71 } 72 73 char* methodOopDesc::name_and_sig_as_C_string() const { 74 return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature()); 75 } 76 77 char* methodOopDesc::name_and_sig_as_C_string(char* buf, int size) const { 78 return name_and_sig_as_C_string(Klass::cast(constants()->pool_holder()), name(), signature(), buf, size); 79 } 80 81 char* methodOopDesc::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { 82 const char* klass_name = klass->external_name(); 83 int klass_name_len = (int)strlen(klass_name); 84 int method_name_len = method_name->utf8_length(); 85 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); 86 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); 87 strcpy(dest, klass_name); 88 dest[klass_name_len] = '.'; 89 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); 90 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); 91 dest[len] = 0; 92 return dest; 93 } 94 95 char* methodOopDesc::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { 96 Symbol* klass_name = klass->name(); 97 klass_name->as_klass_external_name(buf, size); 98 int len = (int)strlen(buf); 99 100 if (len < size - 1) { 101 buf[len++] = '.'; 102 103 method_name->as_C_string(&(buf[len]), size - len); 104 len = (int)strlen(buf); 105 106 signature->as_C_string(&(buf[len]), size - len); 107 } 108 109 return buf; 110 } 111 112 int methodOopDesc::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) { 113 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) 114 // access exception table 115 ExceptionTable table(mh()); 116 int length = table.length(); 117 // iterate through all entries sequentially 118 constantPoolHandle pool(THREAD, mh->constants()); 119 for (int i = 0; i < length; i ++) { 120 //reacquire the table in case a GC happened 121 ExceptionTable table(mh()); 122 int beg_bci = table.start_pc(i); 123 int end_bci = table.end_pc(i); 124 assert(beg_bci <= end_bci, "inconsistent exception table"); 125 if (beg_bci <= throw_bci && throw_bci < end_bci) { 126 // exception handler bci range covers throw_bci => investigate further 127 int handler_bci = table.handler_pc(i); 128 int klass_index = table.catch_type_index(i); 129 if (klass_index == 0) { 130 return handler_bci; 131 } else if (ex_klass.is_null()) { 132 return handler_bci; 133 } else { 134 // we know the exception class => get the constraint class 135 // this may require loading of the constraint class; if verification 136 // fails or some other exception occurs, return handler_bci 137 klassOop k = pool->klass_at(klass_index, CHECK_(handler_bci)); 138 KlassHandle klass = KlassHandle(THREAD, k); 139 assert(klass.not_null(), "klass not loaded"); 140 if (ex_klass->is_subtype_of(klass())) { 141 return handler_bci; 142 } 143 } 144 } 145 } 146 147 return -1; 148 } 149 150 void methodOopDesc::mask_for(int bci, InterpreterOopMap* mask) { 151 152 Thread* myThread = Thread::current(); 153 methodHandle h_this(myThread, this); 154 #ifdef ASSERT 155 bool has_capability = myThread->is_VM_thread() || 156 myThread->is_ConcurrentGC_thread() || 157 myThread->is_GC_task_thread(); 158 159 if (!has_capability) { 160 if (!VerifyStack && !VerifyLastFrame) { 161 // verify stack calls this outside VM thread 162 warning("oopmap should only be accessed by the " 163 "VM, GC task or CMS threads (or during debugging)"); 164 InterpreterOopMap local_mask; 165 instanceKlass::cast(method_holder())->mask_for(h_this, bci, &local_mask); 166 local_mask.print(); 167 } 168 } 169 #endif 170 instanceKlass::cast(method_holder())->mask_for(h_this, bci, mask); 171 return; 172 } 173 174 175 int methodOopDesc::bci_from(address bcp) const { 176 #ifdef ASSERT 177 { ResourceMark rm; 178 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), 179 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string())); 180 } 181 #endif 182 return bcp - code_base(); 183 } 184 185 186 // Return (int)bcx if it appears to be a valid BCI. 187 // Return bci_from((address)bcx) if it appears to be a valid BCP. 188 // Return -1 otherwise. 189 // Used by profiling code, when invalid data is a possibility. 190 // The caller is responsible for validating the methodOop itself. 191 int methodOopDesc::validate_bci_from_bcx(intptr_t bcx) const { 192 // keep bci as -1 if not a valid bci 193 int bci = -1; 194 if (bcx == 0 || (address)bcx == code_base()) { 195 // code_size() may return 0 and we allow 0 here 196 // the method may be native 197 bci = 0; 198 } else if (frame::is_bci(bcx)) { 199 if (bcx < code_size()) { 200 bci = (int)bcx; 201 } 202 } else if (contains((address)bcx)) { 203 bci = (address)bcx - code_base(); 204 } 205 // Assert that if we have dodged any asserts, bci is negative. 206 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 207 return bci; 208 } 209 210 address methodOopDesc::bcp_from(int bci) const { 211 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci"); 212 address bcp = code_base() + bci; 213 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 214 return bcp; 215 } 216 217 218 int methodOopDesc::object_size(bool is_native) { 219 // If native, then include pointers for native_function and signature_handler 220 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 221 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; 222 return align_object_size(header_size() + extra_words); 223 } 224 225 226 Symbol* methodOopDesc::klass_name() const { 227 klassOop k = method_holder(); 228 assert(k->is_klass(), "must be klass"); 229 instanceKlass* ik = (instanceKlass*) k->klass_part(); 230 return ik->name(); 231 } 232 233 234 void methodOopDesc::set_interpreter_kind() { 235 int kind = Interpreter::method_kind(methodOop(this)); 236 assert(kind != Interpreter::invalid, 237 "interpreter entry must be valid"); 238 set_interpreter_kind(kind); 239 } 240 241 242 // Attempt to return method oop to original state. Clear any pointers 243 // (to objects outside the shared spaces). We won't be able to predict 244 // where they should point in a new JVM. Further initialize some 245 // entries now in order allow them to be write protected later. 246 247 void methodOopDesc::remove_unshareable_info() { 248 unlink_method(); 249 set_interpreter_kind(); 250 } 251 252 253 bool methodOopDesc::was_executed_more_than(int n) { 254 // Invocation counter is reset when the methodOop is compiled. 255 // If the method has compiled code we therefore assume it has 256 // be excuted more than n times. 257 if (is_accessor() || is_empty_method() || (code() != NULL)) { 258 // interpreter doesn't bump invocation counter of trivial methods 259 // compiler does not bump invocation counter of compiled methods 260 return true; 261 } 262 else if (_invocation_counter.carry() || (method_data() != NULL && method_data()->invocation_counter()->carry())) { 263 // The carry bit is set when the counter overflows and causes 264 // a compilation to occur. We don't know how many times 265 // the counter has been reset, so we simply assume it has 266 // been executed more than n times. 267 return true; 268 } else { 269 return invocation_count() > n; 270 } 271 } 272 273 #ifndef PRODUCT 274 void methodOopDesc::print_invocation_count() { 275 if (is_static()) tty->print("static "); 276 if (is_final()) tty->print("final "); 277 if (is_synchronized()) tty->print("synchronized "); 278 if (is_native()) tty->print("native "); 279 method_holder()->klass_part()->name()->print_symbol_on(tty); 280 tty->print("."); 281 name()->print_symbol_on(tty); 282 signature()->print_symbol_on(tty); 283 284 if (WizardMode) { 285 // dump the size of the byte codes 286 tty->print(" {%d}", code_size()); 287 } 288 tty->cr(); 289 290 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 291 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 292 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 293 if (CountCompiledCalls) { 294 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 295 } 296 297 } 298 #endif 299 300 // Build a methodDataOop object to hold information about this method 301 // collected in the interpreter. 302 void methodOopDesc::build_interpreter_method_data(methodHandle method, TRAPS) { 303 // Do not profile method if current thread holds the pending list lock, 304 // which avoids deadlock for acquiring the MethodData_lock. 305 if (instanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) { 306 return; 307 } 308 309 // Grab a lock here to prevent multiple 310 // methodDataOops from being created. 311 MutexLocker ml(MethodData_lock, THREAD); 312 if (method->method_data() == NULL) { 313 methodDataOop method_data = oopFactory::new_methodData(method, CHECK); 314 method->set_method_data(method_data); 315 if (PrintMethodData && (Verbose || WizardMode)) { 316 ResourceMark rm(THREAD); 317 tty->print("build_interpreter_method_data for "); 318 method->print_name(tty); 319 tty->cr(); 320 // At the end of the run, the MDO, full of data, will be dumped. 321 } 322 } 323 } 324 325 void methodOopDesc::cleanup_inline_caches() { 326 // The current system doesn't use inline caches in the interpreter 327 // => nothing to do (keep this method around for future use) 328 } 329 330 331 int methodOopDesc::extra_stack_words() { 332 // not an inline function, to avoid a header dependency on Interpreter 333 return extra_stack_entries() * Interpreter::stackElementSize; 334 } 335 336 337 void methodOopDesc::compute_size_of_parameters(Thread *thread) { 338 ArgumentSizeComputer asc(signature()); 339 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 340 } 341 342 #ifdef CC_INTERP 343 void methodOopDesc::set_result_index(BasicType type) { 344 _result_index = Interpreter::BasicType_as_index(type); 345 } 346 #endif 347 348 BasicType methodOopDesc::result_type() const { 349 ResultTypeFinder rtf(signature()); 350 return rtf.type(); 351 } 352 353 354 bool methodOopDesc::is_empty_method() const { 355 return code_size() == 1 356 && *code_base() == Bytecodes::_return; 357 } 358 359 360 bool methodOopDesc::is_vanilla_constructor() const { 361 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 362 // which only calls the superclass vanilla constructor and possibly does stores of 363 // zero constants to local fields: 364 // 365 // aload_0 366 // invokespecial 367 // indexbyte1 368 // indexbyte2 369 // 370 // followed by an (optional) sequence of: 371 // 372 // aload_0 373 // aconst_null / iconst_0 / fconst_0 / dconst_0 374 // putfield 375 // indexbyte1 376 // indexbyte2 377 // 378 // followed by: 379 // 380 // return 381 382 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 383 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 384 int size = code_size(); 385 // Check if size match 386 if (size == 0 || size % 5 != 0) return false; 387 address cb = code_base(); 388 int last = size - 1; 389 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 390 // Does not call superclass default constructor 391 return false; 392 } 393 // Check optional sequence 394 for (int i = 4; i < last; i += 5) { 395 if (cb[i] != Bytecodes::_aload_0) return false; 396 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 397 if (cb[i+2] != Bytecodes::_putfield) return false; 398 } 399 return true; 400 } 401 402 403 bool methodOopDesc::compute_has_loops_flag() { 404 BytecodeStream bcs(methodOop(this)); 405 Bytecodes::Code bc; 406 407 while ((bc = bcs.next()) >= 0) { 408 switch( bc ) { 409 case Bytecodes::_ifeq: 410 case Bytecodes::_ifnull: 411 case Bytecodes::_iflt: 412 case Bytecodes::_ifle: 413 case Bytecodes::_ifne: 414 case Bytecodes::_ifnonnull: 415 case Bytecodes::_ifgt: 416 case Bytecodes::_ifge: 417 case Bytecodes::_if_icmpeq: 418 case Bytecodes::_if_icmpne: 419 case Bytecodes::_if_icmplt: 420 case Bytecodes::_if_icmpgt: 421 case Bytecodes::_if_icmple: 422 case Bytecodes::_if_icmpge: 423 case Bytecodes::_if_acmpeq: 424 case Bytecodes::_if_acmpne: 425 case Bytecodes::_goto: 426 case Bytecodes::_jsr: 427 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 428 break; 429 430 case Bytecodes::_goto_w: 431 case Bytecodes::_jsr_w: 432 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 433 break; 434 } 435 } 436 _access_flags.set_loops_flag_init(); 437 return _access_flags.has_loops(); 438 } 439 440 441 bool methodOopDesc::is_final_method() const { 442 // %%% Should return true for private methods also, 443 // since there is no way to override them. 444 return is_final() || Klass::cast(method_holder())->is_final(); 445 } 446 447 448 bool methodOopDesc::is_strict_method() const { 449 return is_strict(); 450 } 451 452 453 bool methodOopDesc::can_be_statically_bound() const { 454 if (is_final_method()) return true; 455 return vtable_index() == nonvirtual_vtable_index; 456 } 457 458 459 bool methodOopDesc::is_accessor() const { 460 if (code_size() != 5) return false; 461 if (size_of_parameters() != 1) return false; 462 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; 463 if (java_code_at(1) != Bytecodes::_getfield) return false; 464 if (java_code_at(4) != Bytecodes::_areturn && 465 java_code_at(4) != Bytecodes::_ireturn ) return false; 466 return true; 467 } 468 469 470 bool methodOopDesc::is_initializer() const { 471 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); 472 } 473 474 bool methodOopDesc::has_valid_initializer_flags() const { 475 return (is_static() || 476 instanceKlass::cast(method_holder())->major_version() < 51); 477 } 478 479 bool methodOopDesc::is_static_initializer() const { 480 // For classfiles version 51 or greater, ensure that the clinit method is 481 // static. Non-static methods with the name "<clinit>" are not static 482 // initializers. (older classfiles exempted for backward compatibility) 483 return name() == vmSymbols::class_initializer_name() && 484 has_valid_initializer_flags(); 485 } 486 487 488 objArrayHandle methodOopDesc::resolved_checked_exceptions_impl(methodOop this_oop, TRAPS) { 489 int length = this_oop->checked_exceptions_length(); 490 if (length == 0) { // common case 491 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 492 } else { 493 methodHandle h_this(THREAD, this_oop); 494 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 495 objArrayHandle mirrors (THREAD, m_oop); 496 for (int i = 0; i < length; i++) { 497 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 498 klassOop k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 499 assert(Klass::cast(k)->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 500 mirrors->obj_at_put(i, Klass::cast(k)->java_mirror()); 501 } 502 return mirrors; 503 } 504 }; 505 506 507 int methodOopDesc::line_number_from_bci(int bci) const { 508 if (bci == SynchronizationEntryBCI) bci = 0; 509 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 510 int best_bci = 0; 511 int best_line = -1; 512 513 if (has_linenumber_table()) { 514 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 515 // Not necessarily sorted and not necessarily one-to-one. 516 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 517 while (stream.read_pair()) { 518 if (stream.bci() == bci) { 519 // perfect match 520 return stream.line(); 521 } else { 522 // update best_bci/line 523 if (stream.bci() < bci && stream.bci() >= best_bci) { 524 best_bci = stream.bci(); 525 best_line = stream.line(); 526 } 527 } 528 } 529 } 530 return best_line; 531 } 532 533 534 bool methodOopDesc::is_klass_loaded_by_klass_index(int klass_index) const { 535 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { 536 Thread *thread = Thread::current(); 537 Symbol* klass_name = constants()->klass_name_at(klass_index); 538 Handle loader(thread, instanceKlass::cast(method_holder())->class_loader()); 539 Handle prot (thread, Klass::cast(method_holder())->protection_domain()); 540 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 541 } else { 542 return true; 543 } 544 } 545 546 547 bool methodOopDesc::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 548 int klass_index = constants()->klass_ref_index_at(refinfo_index); 549 if (must_be_resolved) { 550 // Make sure klass is resolved in constantpool. 551 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 552 } 553 return is_klass_loaded_by_klass_index(klass_index); 554 } 555 556 557 void methodOopDesc::set_native_function(address function, bool post_event_flag) { 558 assert(function != NULL, "use clear_native_function to unregister natives"); 559 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); 560 address* native_function = native_function_addr(); 561 562 // We can see racers trying to place the same native function into place. Once 563 // is plenty. 564 address current = *native_function; 565 if (current == function) return; 566 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 567 function != NULL) { 568 // native_method_throw_unsatisfied_link_error_entry() should only 569 // be passed when post_event_flag is false. 570 assert(function != 571 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 572 "post_event_flag mis-match"); 573 574 // post the bind event, and possible change the bind function 575 JvmtiExport::post_native_method_bind(this, &function); 576 } 577 *native_function = function; 578 // This function can be called more than once. We must make sure that we always 579 // use the latest registered method -> check if a stub already has been generated. 580 // If so, we have to make it not_entrant. 581 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 582 if (nm != NULL) { 583 nm->make_not_entrant(); 584 } 585 } 586 587 588 bool methodOopDesc::has_native_function() const { 589 if (is_method_handle_intrinsic()) 590 return false; // special-cased in SharedRuntime::generate_native_wrapper 591 address func = native_function(); 592 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 593 } 594 595 596 void methodOopDesc::clear_native_function() { 597 // Note: is_method_handle_intrinsic() is allowed here. 598 set_native_function( 599 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 600 !native_bind_event_is_interesting); 601 clear_code(); 602 } 603 604 address methodOopDesc::critical_native_function() { 605 methodHandle mh(this); 606 return NativeLookup::lookup_critical_entry(mh); 607 } 608 609 610 void methodOopDesc::set_signature_handler(address handler) { 611 address* signature_handler = signature_handler_addr(); 612 *signature_handler = handler; 613 } 614 615 616 void methodOopDesc::print_made_not_compilable(int comp_level, bool is_osr, bool report) { 617 if (PrintCompilation && report) { 618 ttyLocker ttyl; 619 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); 620 if (comp_level == CompLevel_all) { 621 tty->print("all levels "); 622 } else { 623 tty->print("levels "); 624 for (int i = (int)CompLevel_none; i <= comp_level; i++) { 625 tty->print("%d ", i); 626 } 627 } 628 this->print_short_name(tty); 629 int size = this->code_size(); 630 if (size > 0) 631 tty->print(" (%d bytes)", size); 632 tty->cr(); 633 } 634 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 635 ttyLocker ttyl; 636 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'", 637 is_osr ? "osr_" : "", os::current_thread_id()); 638 xtty->method(methodOop(this)); 639 xtty->stamp(); 640 xtty->end_elem(); 641 } 642 } 643 644 bool methodOopDesc::is_not_compilable(int comp_level) const { 645 if (number_of_breakpoints() > 0) 646 return true; 647 if (is_method_handle_intrinsic()) 648 return !is_synthetic(); // the generated adapters must be compiled 649 if (comp_level == CompLevel_any) 650 return is_not_c1_compilable() || is_not_c2_compilable(); 651 if (is_c1_compile(comp_level)) 652 return is_not_c1_compilable(); 653 if (is_c2_compile(comp_level)) 654 return is_not_c2_compilable(); 655 return false; 656 } 657 658 // call this when compiler finds that this method is not compilable 659 void methodOopDesc::set_not_compilable(int comp_level, bool report) { 660 print_made_not_compilable(comp_level, /*is_osr*/ false, report); 661 if (comp_level == CompLevel_all) { 662 set_not_c1_compilable(); 663 set_not_c2_compilable(); 664 } else { 665 if (is_c1_compile(comp_level)) 666 set_not_c1_compilable(); 667 if (is_c2_compile(comp_level)) 668 set_not_c2_compilable(); 669 } 670 CompilationPolicy::policy()->disable_compilation(this); 671 } 672 673 bool methodOopDesc::is_not_osr_compilable(int comp_level) const { 674 if (is_not_compilable(comp_level)) 675 return true; 676 if (comp_level == CompLevel_any) 677 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); 678 if (is_c1_compile(comp_level)) 679 return is_not_c1_osr_compilable(); 680 if (is_c2_compile(comp_level)) 681 return is_not_c2_osr_compilable(); 682 return false; 683 } 684 685 void methodOopDesc::set_not_osr_compilable(int comp_level, bool report) { 686 print_made_not_compilable(comp_level, /*is_osr*/ true, report); 687 if (comp_level == CompLevel_all) { 688 set_not_c1_osr_compilable(); 689 set_not_c2_osr_compilable(); 690 } else { 691 if (is_c1_compile(comp_level)) 692 set_not_c1_osr_compilable(); 693 if (is_c2_compile(comp_level)) 694 set_not_c2_osr_compilable(); 695 } 696 CompilationPolicy::policy()->disable_compilation(this); 697 } 698 699 // Revert to using the interpreter and clear out the nmethod 700 void methodOopDesc::clear_code() { 701 702 // this may be NULL if c2i adapters have not been made yet 703 // Only should happen at allocate time. 704 if (_adapter == NULL) { 705 _from_compiled_entry = NULL; 706 } else { 707 _from_compiled_entry = _adapter->get_c2i_entry(); 708 } 709 OrderAccess::storestore(); 710 _from_interpreted_entry = _i2i_entry; 711 OrderAccess::storestore(); 712 _code = NULL; 713 } 714 715 // Called by class data sharing to remove any entry points (which are not shared) 716 void methodOopDesc::unlink_method() { 717 _code = NULL; 718 _i2i_entry = NULL; 719 _from_interpreted_entry = NULL; 720 if (is_native()) { 721 *native_function_addr() = NULL; 722 set_signature_handler(NULL); 723 } 724 NOT_PRODUCT(set_compiled_invocation_count(0);) 725 invocation_counter()->reset(); 726 backedge_counter()->reset(); 727 _adapter = NULL; 728 _from_compiled_entry = NULL; 729 assert(_method_data == NULL, "unexpected method data?"); 730 set_method_data(NULL); 731 set_interpreter_throwout_count(0); 732 set_interpreter_invocation_count(0); 733 } 734 735 // Called when the method_holder is getting linked. Setup entrypoints so the method 736 // is ready to be called from interpreter, compiler, and vtables. 737 void methodOopDesc::link_method(methodHandle h_method, TRAPS) { 738 // If the code cache is full, we may reenter this function for the 739 // leftover methods that weren't linked. 740 if (_i2i_entry != NULL) return; 741 742 assert(_adapter == NULL, "init'd to NULL" ); 743 assert( _code == NULL, "nothing compiled yet" ); 744 745 // Setup interpreter entrypoint 746 assert(this == h_method(), "wrong h_method()" ); 747 address entry = Interpreter::entry_for_method(h_method); 748 assert(entry != NULL, "interpreter entry must be non-null"); 749 // Sets both _i2i_entry and _from_interpreted_entry 750 set_interpreter_entry(entry); 751 if (is_native() && !is_method_handle_intrinsic()) { 752 set_native_function( 753 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 754 !native_bind_event_is_interesting); 755 } 756 757 // Setup compiler entrypoint. This is made eagerly, so we do not need 758 // special handling of vtables. An alternative is to make adapters more 759 // lazily by calling make_adapter() from from_compiled_entry() for the 760 // normal calls. For vtable calls life gets more complicated. When a 761 // call-site goes mega-morphic we need adapters in all methods which can be 762 // called from the vtable. We need adapters on such methods that get loaded 763 // later. Ditto for mega-morphic itable calls. If this proves to be a 764 // problem we'll make these lazily later. 765 (void) make_adapters(h_method, CHECK); 766 767 // ONLY USE the h_method now as make_adapter may have blocked 768 769 } 770 771 address methodOopDesc::make_adapters(methodHandle mh, TRAPS) { 772 // Adapters for compiled code are made eagerly here. They are fairly 773 // small (generally < 100 bytes) and quick to make (and cached and shared) 774 // so making them eagerly shouldn't be too expensive. 775 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 776 if (adapter == NULL ) { 777 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); 778 } 779 780 mh->set_adapter_entry(adapter); 781 mh->_from_compiled_entry = adapter->get_c2i_entry(); 782 return adapter->get_c2i_entry(); 783 } 784 785 // The verified_code_entry() must be called when a invoke is resolved 786 // on this method. 787 788 // It returns the compiled code entry point, after asserting not null. 789 // This function is called after potential safepoints so that nmethod 790 // or adapter that it points to is still live and valid. 791 // This function must not hit a safepoint! 792 address methodOopDesc::verified_code_entry() { 793 debug_only(No_Safepoint_Verifier nsv;) 794 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 795 if (code == NULL && UseCodeCacheFlushing) { 796 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this); 797 if (saved_code != NULL) { 798 methodHandle method(this); 799 assert( ! saved_code->is_osr_method(), "should not get here for osr" ); 800 set_code( method, saved_code ); 801 } 802 } 803 804 assert(_from_compiled_entry != NULL, "must be set"); 805 return _from_compiled_entry; 806 } 807 808 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 809 // (could be racing a deopt). 810 // Not inline to avoid circular ref. 811 bool methodOopDesc::check_code() const { 812 // cached in a register or local. There's a race on the value of the field. 813 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 814 return code == NULL || (code->method() == NULL) || (code->method() == (methodOop)this && !code->is_osr_method()); 815 } 816 817 // Install compiled code. Instantly it can execute. 818 void methodOopDesc::set_code(methodHandle mh, nmethod *code) { 819 assert( code, "use clear_code to remove code" ); 820 assert( mh->check_code(), "" ); 821 822 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 823 824 // These writes must happen in this order, because the interpreter will 825 // directly jump to from_interpreted_entry which jumps to an i2c adapter 826 // which jumps to _from_compiled_entry. 827 mh->_code = code; // Assign before allowing compiled code to exec 828 829 int comp_level = code->comp_level(); 830 // In theory there could be a race here. In practice it is unlikely 831 // and not worth worrying about. 832 if (comp_level > mh->highest_comp_level()) { 833 mh->set_highest_comp_level(comp_level); 834 } 835 836 OrderAccess::storestore(); 837 #ifdef SHARK 838 mh->_from_interpreted_entry = code->insts_begin(); 839 #else //!SHARK 840 mh->_from_compiled_entry = code->verified_entry_point(); 841 OrderAccess::storestore(); 842 // Instantly compiled code can execute. 843 if (!mh->is_method_handle_intrinsic()) 844 mh->_from_interpreted_entry = mh->get_i2c_entry(); 845 #endif //!SHARK 846 } 847 848 849 bool methodOopDesc::is_overridden_in(klassOop k) const { 850 instanceKlass* ik = instanceKlass::cast(k); 851 852 if (ik->is_interface()) return false; 853 854 // If method is an interface, we skip it - except if it 855 // is a miranda method 856 if (instanceKlass::cast(method_holder())->is_interface()) { 857 // Check that method is not a miranda method 858 if (ik->lookup_method(name(), signature()) == NULL) { 859 // No implementation exist - so miranda method 860 return false; 861 } 862 return true; 863 } 864 865 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 866 assert(ik->vtable() != NULL, "vtable should exist"); 867 if (vtable_index() == nonvirtual_vtable_index) { 868 return false; 869 } else { 870 methodOop vt_m = ik->method_at_vtable(vtable_index()); 871 return vt_m != methodOop(this); 872 } 873 } 874 875 876 // give advice about whether this methodOop should be cached or not 877 bool methodOopDesc::should_not_be_cached() const { 878 if (is_old()) { 879 // This method has been redefined. It is either EMCP or obsolete 880 // and we don't want to cache it because that would pin the method 881 // down and prevent it from being collectible if and when it 882 // finishes executing. 883 return true; 884 } 885 886 if (mark()->should_not_be_cached()) { 887 // It is either not safe or not a good idea to cache this 888 // method at this time because of the state of the embedded 889 // markOop. See markOop.cpp for the gory details. 890 return true; 891 } 892 893 // caching this method should be just fine 894 return false; 895 } 896 897 // Constant pool structure for invoke methods: 898 enum { 899 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. 900 _imcp_invoke_signature, // utf8: (variable Symbol*) 901 _imcp_limit 902 }; 903 904 // Test if this method is an MH adapter frame generated by Java code. 905 // Cf. java/lang/invoke/InvokerBytecodeGenerator 906 bool methodOopDesc::is_compiled_lambda_form() const { 907 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; 908 } 909 910 // Test if this method is an internal MH primitive method. 911 bool methodOopDesc::is_method_handle_intrinsic() const { 912 vmIntrinsics::ID iid = intrinsic_id(); 913 return (MethodHandles::is_signature_polymorphic(iid) && 914 MethodHandles::is_signature_polymorphic_intrinsic(iid)); 915 } 916 917 bool methodOopDesc::has_member_arg() const { 918 vmIntrinsics::ID iid = intrinsic_id(); 919 return (MethodHandles::is_signature_polymorphic(iid) && 920 MethodHandles::has_member_arg(iid)); 921 } 922 923 // Make an instance of a signature-polymorphic internal MH primitive. 924 methodHandle methodOopDesc::make_method_handle_intrinsic(vmIntrinsics::ID iid, 925 Symbol* signature, 926 TRAPS) { 927 ResourceMark rm; 928 methodHandle empty; 929 930 KlassHandle holder = SystemDictionary::MethodHandle_klass(); 931 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); 932 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); 933 if (TraceMethodHandles) { 934 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); 935 } 936 937 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 938 name->increment_refcount(); 939 signature->increment_refcount(); 940 941 int cp_length = _imcp_limit; 942 constantPoolHandle cp; 943 { 944 constantPoolOop cp_oop = oopFactory::new_constantPool(cp_length, IsSafeConc, CHECK_(empty)); 945 cp = constantPoolHandle(THREAD, cp_oop); 946 } 947 cp->symbol_at_put(_imcp_invoke_name, name); 948 cp->symbol_at_put(_imcp_invoke_signature, signature); 949 cp->set_preresolution(); 950 cp->set_pool_holder(holder()); 951 952 // decide on access bits: public or not? 953 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); 954 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); 955 if (must_be_static) flags_bits |= JVM_ACC_STATIC; 956 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); 957 958 methodHandle m; 959 { 960 methodOop m_oop = oopFactory::new_method(0, accessFlags_from(flags_bits), 961 0, 0, 0, 0, IsSafeConc, CHECK_(empty)); 962 m = methodHandle(THREAD, m_oop); 963 } 964 m->set_constants(cp()); 965 m->set_name_index(_imcp_invoke_name); 966 m->set_signature_index(_imcp_invoke_signature); 967 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); 968 assert(m->signature() == signature, ""); 969 #ifdef CC_INTERP 970 ResultTypeFinder rtf(signature); 971 m->set_result_index(rtf.type()); 972 #endif 973 m->compute_size_of_parameters(THREAD); 974 m->init_intrinsic_id(); 975 assert(m->is_method_handle_intrinsic(), ""); 976 #ifdef ASSERT 977 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); 978 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); 979 assert(m->intrinsic_id() == iid, "correctly predicted iid"); 980 #endif //ASSERT 981 982 // Finally, set up its entry points. 983 assert(m->can_be_statically_bound(), ""); 984 m->set_vtable_index(methodOopDesc::nonvirtual_vtable_index); 985 m->link_method(m, CHECK_(empty)); 986 987 if (TraceMethodHandles && (Verbose || WizardMode)) 988 m->print_on(tty); 989 990 return m; 991 } 992 993 klassOop methodOopDesc::check_non_bcp_klass(klassOop klass) { 994 if (klass != NULL && Klass::cast(klass)->class_loader() != NULL) { 995 if (Klass::cast(klass)->oop_is_objArray()) 996 klass = objArrayKlass::cast(klass)->bottom_klass(); 997 return klass; 998 } 999 return NULL; 1000 } 1001 1002 1003 methodHandle methodOopDesc::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1004 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1005 // Code below does not work for native methods - they should never get rewritten anyway 1006 assert(!m->is_native(), "cannot rewrite native methods"); 1007 // Allocate new methodOop 1008 AccessFlags flags = m->access_flags(); 1009 int checked_exceptions_len = m->checked_exceptions_length(); 1010 int localvariable_len = m->localvariable_table_length(); 1011 int exception_table_len = m->exception_table_length(); 1012 // Allocate newm_oop with the is_conc_safe parameter set 1013 // to IsUnsafeConc to indicate that newm_oop is not yet 1014 // safe for concurrent processing by a GC. 1015 methodOop newm_oop = oopFactory::new_method(new_code_length, 1016 flags, 1017 new_compressed_linenumber_size, 1018 localvariable_len, 1019 exception_table_len, 1020 checked_exceptions_len, 1021 IsUnsafeConc, 1022 CHECK_(methodHandle())); 1023 methodHandle newm (THREAD, newm_oop); 1024 NOT_PRODUCT(int nmsz = newm->is_parsable() ? newm->size() : -1;) 1025 int new_method_size = newm->method_size(); 1026 // Create a shallow copy of methodOopDesc part, but be careful to preserve the new constMethodOop 1027 constMethodOop newcm = newm->constMethod(); 1028 NOT_PRODUCT(int ncmsz = newcm->is_parsable() ? newcm->size() : -1;) 1029 int new_const_method_size = newm->constMethod()->object_size(); 1030 1031 memcpy(newm(), m(), sizeof(methodOopDesc)); 1032 // Create shallow copy of constMethodOopDesc, but be careful to preserve the methodOop 1033 // is_conc_safe is set to false because that is the value of 1034 // is_conc_safe initialzied into newcm and the copy should 1035 // not overwrite that value. During the window during which it is 1036 // tagged as unsafe, some extra work could be needed during precleaning 1037 // or concurrent marking but those phases will be correct. Setting and 1038 // resetting is done in preference to a careful copying into newcm to 1039 // avoid having to know the precise layout of a constMethodOop. 1040 m->constMethod()->set_is_conc_safe(oopDesc::IsUnsafeConc); 1041 assert(m->constMethod()->is_parsable(), "Should remain parsable"); 1042 1043 // NOTE: this is a reachable object that transiently signals "conc_unsafe" 1044 // However, no allocations are done during this window 1045 // during which it is tagged conc_unsafe, so we are assured that any concurrent 1046 // thread will not wait forever for the object to revert to "conc_safe". 1047 // Further, any such conc_unsafe object will indicate a stable size 1048 // through the transition. 1049 memcpy(newcm, m->constMethod(), sizeof(constMethodOopDesc)); 1050 m->constMethod()->set_is_conc_safe(oopDesc::IsSafeConc); 1051 assert(m->constMethod()->is_parsable(), "Should remain parsable"); 1052 1053 // Reset correct method/const method, method size, and parameter info 1054 newm->set_constMethod(newcm); 1055 newm->constMethod()->set_code_size(new_code_length); 1056 newm->constMethod()->set_constMethod_size(new_const_method_size); 1057 newm->set_method_size(new_method_size); 1058 assert(newm->code_size() == new_code_length, "check"); 1059 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1060 assert(newm->exception_table_length() == exception_table_len, "check"); 1061 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1062 // Copy new byte codes 1063 memcpy(newm->code_base(), new_code, new_code_length); 1064 // Copy line number table 1065 if (new_compressed_linenumber_size > 0) { 1066 memcpy(newm->compressed_linenumber_table(), 1067 new_compressed_linenumber_table, 1068 new_compressed_linenumber_size); 1069 } 1070 // Copy checked_exceptions 1071 if (checked_exceptions_len > 0) { 1072 memcpy(newm->checked_exceptions_start(), 1073 m->checked_exceptions_start(), 1074 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1075 } 1076 // Copy exception table 1077 if (exception_table_len > 0) { 1078 memcpy(newm->exception_table_start(), 1079 m->exception_table_start(), 1080 exception_table_len * sizeof(ExceptionTableElement)); 1081 } 1082 // Copy local variable number table 1083 if (localvariable_len > 0) { 1084 memcpy(newm->localvariable_table_start(), 1085 m->localvariable_table_start(), 1086 localvariable_len * sizeof(LocalVariableTableElement)); 1087 } 1088 1089 // Only set is_conc_safe to true when changes to newcm are 1090 // complete. 1091 assert(!newm->is_parsable() || nmsz < 0 || newm->size() == nmsz, "newm->size() inconsistency"); 1092 assert(!newcm->is_parsable() || ncmsz < 0 || newcm->size() == ncmsz, "newcm->size() inconsistency"); 1093 newcm->set_is_conc_safe(true); 1094 return newm; 1095 } 1096 1097 vmSymbols::SID methodOopDesc::klass_id_for_intrinsics(klassOop holder) { 1098 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1099 // because we are not loading from core libraries 1100 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar 1101 // which does not use the class default class loader so we check for its loader here 1102 if ((instanceKlass::cast(holder)->class_loader() != NULL) && 1103 instanceKlass::cast(holder)->class_loader()->klass()->klass_part()->name() != vmSymbols::sun_misc_Launcher_ExtClassLoader()) { 1104 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1105 } 1106 1107 // see if the klass name is well-known: 1108 Symbol* klass_name = instanceKlass::cast(holder)->name(); 1109 return vmSymbols::find_sid(klass_name); 1110 } 1111 1112 void methodOopDesc::init_intrinsic_id() { 1113 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1114 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1115 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1116 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1117 1118 // the klass name is well-known: 1119 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1120 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1121 1122 // ditto for method and signature: 1123 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1124 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1125 && name_id == vmSymbols::NO_SID) 1126 return; 1127 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1128 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1129 && sig_id == vmSymbols::NO_SID) return; 1130 jshort flags = access_flags().as_short(); 1131 1132 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1133 if (id != vmIntrinsics::_none) { 1134 set_intrinsic_id(id); 1135 return; 1136 } 1137 1138 // A few slightly irregular cases: 1139 switch (klass_id) { 1140 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1141 // Second chance: check in regular Math. 1142 switch (name_id) { 1143 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1144 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1145 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1146 // pretend it is the corresponding method in the non-strict class: 1147 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1148 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1149 break; 1150 } 1151 break; 1152 1153 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. 1154 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1155 if (!is_native()) break; 1156 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); 1157 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) 1158 id = vmIntrinsics::_none; 1159 break; 1160 } 1161 1162 if (id != vmIntrinsics::_none) { 1163 // Set up its iid. It is an alias method. 1164 set_intrinsic_id(id); 1165 return; 1166 } 1167 } 1168 1169 // These two methods are static since a GC may move the methodOopDesc 1170 bool methodOopDesc::load_signature_classes(methodHandle m, TRAPS) { 1171 if (THREAD->is_Compiler_thread()) { 1172 // There is nothing useful this routine can do from within the Compile thread. 1173 // Hopefully, the signature contains only well-known classes. 1174 // We could scan for this and return true/false, but the caller won't care. 1175 return false; 1176 } 1177 bool sig_is_loaded = true; 1178 Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader()); 1179 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain()); 1180 ResourceMark rm(THREAD); 1181 Symbol* signature = m->signature(); 1182 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1183 if (ss.is_object()) { 1184 Symbol* sym = ss.as_symbol(CHECK_(false)); 1185 Symbol* name = sym; 1186 klassOop klass = SystemDictionary::resolve_or_null(name, class_loader, 1187 protection_domain, THREAD); 1188 // We are loading classes eagerly. If a ClassNotFoundException or 1189 // a LinkageError was generated, be sure to ignore it. 1190 if (HAS_PENDING_EXCEPTION) { 1191 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1192 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1193 CLEAR_PENDING_EXCEPTION; 1194 } else { 1195 return false; 1196 } 1197 } 1198 if( klass == NULL) { sig_is_loaded = false; } 1199 } 1200 } 1201 return sig_is_loaded; 1202 } 1203 1204 bool methodOopDesc::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1205 Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader()); 1206 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain()); 1207 ResourceMark rm(THREAD); 1208 Symbol* signature = m->signature(); 1209 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1210 if (ss.type() == T_OBJECT) { 1211 Symbol* name = ss.as_symbol_or_null(); 1212 if (name == NULL) return true; 1213 klassOop klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1214 if (klass == NULL) return true; 1215 } 1216 } 1217 return false; 1218 } 1219 1220 // Exposed so field engineers can debug VM 1221 void methodOopDesc::print_short_name(outputStream* st) { 1222 ResourceMark rm; 1223 #ifdef PRODUCT 1224 st->print(" %s::", method_holder()->klass_part()->external_name()); 1225 #else 1226 st->print(" %s::", method_holder()->klass_part()->internal_name()); 1227 #endif 1228 name()->print_symbol_on(st); 1229 if (WizardMode) signature()->print_symbol_on(st); 1230 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) 1231 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); 1232 } 1233 1234 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1235 static void reorder_based_on_method_index(objArrayOop methods, 1236 objArrayOop annotations, 1237 GrowableArray<oop>* temp_array) { 1238 if (annotations == NULL) { 1239 return; 1240 } 1241 1242 int length = methods->length(); 1243 int i; 1244 // Copy to temp array 1245 temp_array->clear(); 1246 for (i = 0; i < length; i++) { 1247 temp_array->append(annotations->obj_at(i)); 1248 } 1249 1250 // Copy back using old method indices 1251 for (i = 0; i < length; i++) { 1252 methodOop m = (methodOop) methods->obj_at(i); 1253 annotations->obj_at_put(i, temp_array->at(m->method_idnum())); 1254 } 1255 } 1256 1257 // Comparer for sorting an object array containing 1258 // methodOops. 1259 // Used non-template method_comparator methods since 1260 // Visual Studio 2003 compiler generates incorrect 1261 // optimized code for it. 1262 static int method_comparator_narrowOop(narrowOop a, narrowOop b) { 1263 methodOop m = (methodOop)oopDesc::decode_heap_oop_not_null(a); 1264 methodOop n = (methodOop)oopDesc::decode_heap_oop_not_null(b); 1265 return m->name()->fast_compare(n->name()); 1266 } 1267 static int method_comparator_oop(oop a, oop b) { 1268 methodOop m = (methodOop)a; 1269 methodOop n = (methodOop)b; 1270 return m->name()->fast_compare(n->name()); 1271 } 1272 1273 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1274 void methodOopDesc::sort_methods(objArrayOop methods, 1275 objArrayOop methods_annotations, 1276 objArrayOop methods_parameter_annotations, 1277 objArrayOop methods_default_annotations, 1278 bool idempotent) { 1279 int length = methods->length(); 1280 if (length > 1) { 1281 bool do_annotations = false; 1282 if (methods_annotations != NULL || 1283 methods_parameter_annotations != NULL || 1284 methods_default_annotations != NULL) { 1285 do_annotations = true; 1286 } 1287 if (do_annotations) { 1288 // Remember current method ordering so we can reorder annotations 1289 for (int i = 0; i < length; i++) { 1290 methodOop m = (methodOop) methods->obj_at(i); 1291 m->set_method_idnum(i); 1292 } 1293 } 1294 { 1295 No_Safepoint_Verifier nsv; 1296 if (UseCompressedOops) { 1297 QuickSort::sort<narrowOop>((narrowOop*)(methods->base()), length, method_comparator_narrowOop, idempotent); 1298 } else { 1299 QuickSort::sort<oop>((oop*)(methods->base()), length, method_comparator_oop, idempotent); 1300 } 1301 if (UseConcMarkSweepGC) { 1302 // For CMS we need to dirty the cards for the array 1303 BarrierSet* bs = Universe::heap()->barrier_set(); 1304 assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt"); 1305 bs->write_ref_array(methods->base(), length); 1306 } 1307 } 1308 1309 // Sort annotations if necessary 1310 assert(methods_annotations == NULL || methods_annotations->length() == methods->length(), ""); 1311 assert(methods_parameter_annotations == NULL || methods_parameter_annotations->length() == methods->length(), ""); 1312 assert(methods_default_annotations == NULL || methods_default_annotations->length() == methods->length(), ""); 1313 if (do_annotations) { 1314 ResourceMark rm; 1315 // Allocate temporary storage 1316 GrowableArray<oop>* temp_array = new GrowableArray<oop>(length); 1317 reorder_based_on_method_index(methods, methods_annotations, temp_array); 1318 reorder_based_on_method_index(methods, methods_parameter_annotations, temp_array); 1319 reorder_based_on_method_index(methods, methods_default_annotations, temp_array); 1320 } 1321 1322 // Reset method ordering 1323 for (int i = 0; i < length; i++) { 1324 methodOop m = (methodOop) methods->obj_at(i); 1325 m->set_method_idnum(i); 1326 } 1327 } 1328 } 1329 1330 1331 //----------------------------------------------------------------------------------- 1332 // Non-product code 1333 1334 #ifndef PRODUCT 1335 class SignatureTypePrinter : public SignatureTypeNames { 1336 private: 1337 outputStream* _st; 1338 bool _use_separator; 1339 1340 void type_name(const char* name) { 1341 if (_use_separator) _st->print(", "); 1342 _st->print(name); 1343 _use_separator = true; 1344 } 1345 1346 public: 1347 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1348 _st = st; 1349 _use_separator = false; 1350 } 1351 1352 void print_parameters() { _use_separator = false; iterate_parameters(); } 1353 void print_returntype() { _use_separator = false; iterate_returntype(); } 1354 }; 1355 1356 1357 void methodOopDesc::print_name(outputStream* st) { 1358 Thread *thread = Thread::current(); 1359 ResourceMark rm(thread); 1360 SignatureTypePrinter sig(signature(), st); 1361 st->print("%s ", is_static() ? "static" : "virtual"); 1362 sig.print_returntype(); 1363 st->print(" %s.", method_holder()->klass_part()->internal_name()); 1364 name()->print_symbol_on(st); 1365 st->print("("); 1366 sig.print_parameters(); 1367 st->print(")"); 1368 } 1369 1370 1371 void methodOopDesc::print_codes_on(outputStream* st) const { 1372 print_codes_on(0, code_size(), st); 1373 } 1374 1375 void methodOopDesc::print_codes_on(int from, int to, outputStream* st) const { 1376 Thread *thread = Thread::current(); 1377 ResourceMark rm(thread); 1378 methodHandle mh (thread, (methodOop)this); 1379 BytecodeStream s(mh); 1380 s.set_interval(from, to); 1381 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1382 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1383 } 1384 #endif // not PRODUCT 1385 1386 1387 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1388 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1389 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1390 // as end-of-stream terminator. 1391 1392 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1393 // bci and line number does not compress into single byte. 1394 // Write out escape character and use regular compression for bci and line number. 1395 write_byte((jubyte)0xFF); 1396 write_signed_int(bci_delta); 1397 write_signed_int(line_delta); 1398 } 1399 1400 // See comment in methodOop.hpp which explains why this exists. 1401 #if defined(_M_AMD64) && _MSC_VER >= 1400 1402 #pragma optimize("", off) 1403 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1404 write_pair_inline(bci, line); 1405 } 1406 #pragma optimize("", on) 1407 #endif 1408 1409 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1410 _bci = 0; 1411 _line = 0; 1412 }; 1413 1414 1415 bool CompressedLineNumberReadStream::read_pair() { 1416 jubyte next = read_byte(); 1417 // Check for terminator 1418 if (next == 0) return false; 1419 if (next == 0xFF) { 1420 // Escape character, regular compression used 1421 _bci += read_signed_int(); 1422 _line += read_signed_int(); 1423 } else { 1424 // Single byte compression used 1425 _bci += next >> 3; 1426 _line += next & 0x7; 1427 } 1428 return true; 1429 } 1430 1431 1432 Bytecodes::Code methodOopDesc::orig_bytecode_at(int bci) const { 1433 BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints(); 1434 for (; bp != NULL; bp = bp->next()) { 1435 if (bp->match(this, bci)) { 1436 return bp->orig_bytecode(); 1437 } 1438 } 1439 ShouldNotReachHere(); 1440 return Bytecodes::_shouldnotreachhere; 1441 } 1442 1443 void methodOopDesc::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1444 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1445 BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints(); 1446 for (; bp != NULL; bp = bp->next()) { 1447 if (bp->match(this, bci)) { 1448 bp->set_orig_bytecode(code); 1449 // and continue, in case there is more than one 1450 } 1451 } 1452 } 1453 1454 void methodOopDesc::set_breakpoint(int bci) { 1455 instanceKlass* ik = instanceKlass::cast(method_holder()); 1456 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1457 bp->set_next(ik->breakpoints()); 1458 ik->set_breakpoints(bp); 1459 // do this last: 1460 bp->set(this); 1461 } 1462 1463 static void clear_matches(methodOop m, int bci) { 1464 instanceKlass* ik = instanceKlass::cast(m->method_holder()); 1465 BreakpointInfo* prev_bp = NULL; 1466 BreakpointInfo* next_bp; 1467 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1468 next_bp = bp->next(); 1469 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1470 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1471 // do this first: 1472 bp->clear(m); 1473 // unhook it 1474 if (prev_bp != NULL) 1475 prev_bp->set_next(next_bp); 1476 else 1477 ik->set_breakpoints(next_bp); 1478 delete bp; 1479 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1480 // at same location. So we have multiple matching (method_index and bci) 1481 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1482 // breakpoint for clear_breakpoint request and keep all other method versions 1483 // BreakpointInfo for future clear_breakpoint request. 1484 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1485 // which is being called when class is unloaded. We delete all the Breakpoint 1486 // information for all versions of method. We may not correctly restore the original 1487 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1488 // so these methods won't be used anymore. 1489 if (bci >= 0) { 1490 break; 1491 } 1492 } else { 1493 // This one is a keeper. 1494 prev_bp = bp; 1495 } 1496 } 1497 } 1498 1499 void methodOopDesc::clear_breakpoint(int bci) { 1500 assert(bci >= 0, ""); 1501 clear_matches(this, bci); 1502 } 1503 1504 void methodOopDesc::clear_all_breakpoints() { 1505 clear_matches(this, -1); 1506 } 1507 1508 1509 int methodOopDesc::invocation_count() { 1510 if (TieredCompilation) { 1511 const methodDataOop mdo = method_data(); 1512 if (invocation_counter()->carry() || ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1513 return InvocationCounter::count_limit; 1514 } else { 1515 return invocation_counter()->count() + ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1516 } 1517 } else { 1518 return invocation_counter()->count(); 1519 } 1520 } 1521 1522 int methodOopDesc::backedge_count() { 1523 if (TieredCompilation) { 1524 const methodDataOop mdo = method_data(); 1525 if (backedge_counter()->carry() || ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1526 return InvocationCounter::count_limit; 1527 } else { 1528 return backedge_counter()->count() + ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1529 } 1530 } else { 1531 return backedge_counter()->count(); 1532 } 1533 } 1534 1535 int methodOopDesc::highest_comp_level() const { 1536 methodDataOop mdo = method_data(); 1537 if (mdo != NULL) { 1538 return mdo->highest_comp_level(); 1539 } else { 1540 return CompLevel_none; 1541 } 1542 } 1543 1544 int methodOopDesc::highest_osr_comp_level() const { 1545 methodDataOop mdo = method_data(); 1546 if (mdo != NULL) { 1547 return mdo->highest_osr_comp_level(); 1548 } else { 1549 return CompLevel_none; 1550 } 1551 } 1552 1553 void methodOopDesc::set_highest_comp_level(int level) { 1554 methodDataOop mdo = method_data(); 1555 if (mdo != NULL) { 1556 mdo->set_highest_comp_level(level); 1557 } 1558 } 1559 1560 void methodOopDesc::set_highest_osr_comp_level(int level) { 1561 methodDataOop mdo = method_data(); 1562 if (mdo != NULL) { 1563 mdo->set_highest_osr_comp_level(level); 1564 } 1565 } 1566 1567 BreakpointInfo::BreakpointInfo(methodOop m, int bci) { 1568 _bci = bci; 1569 _name_index = m->name_index(); 1570 _signature_index = m->signature_index(); 1571 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1572 if (_orig_bytecode == Bytecodes::_breakpoint) 1573 _orig_bytecode = m->orig_bytecode_at(_bci); 1574 _next = NULL; 1575 } 1576 1577 void BreakpointInfo::set(methodOop method) { 1578 #ifdef ASSERT 1579 { 1580 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1581 if (code == Bytecodes::_breakpoint) 1582 code = method->orig_bytecode_at(_bci); 1583 assert(orig_bytecode() == code, "original bytecode must be the same"); 1584 } 1585 #endif 1586 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1587 method->incr_number_of_breakpoints(); 1588 SystemDictionary::notice_modification(); 1589 { 1590 // Deoptimize all dependents on this method 1591 Thread *thread = Thread::current(); 1592 HandleMark hm(thread); 1593 methodHandle mh(thread, method); 1594 Universe::flush_dependents_on_method(mh); 1595 } 1596 } 1597 1598 void BreakpointInfo::clear(methodOop method) { 1599 *method->bcp_from(_bci) = orig_bytecode(); 1600 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1601 method->decr_number_of_breakpoints(); 1602 }