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/methodHandleWalk.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() { 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) { 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(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 const int beg_bci_offset = 0; 115 const int end_bci_offset = 1; 116 const int handler_bci_offset = 2; 117 const int klass_index_offset = 3; 118 const int entry_size = 4; 119 // access exception table 120 typeArrayHandle table (THREAD, constMethod()->exception_table()); 121 int length = table->length(); 122 assert(length % entry_size == 0, "exception table format has changed"); 123 // iterate through all entries sequentially 124 constantPoolHandle pool(THREAD, constants()); 125 for (int i = 0; i < length; i += entry_size) { 126 int beg_bci = table->int_at(i + beg_bci_offset); 127 int end_bci = table->int_at(i + end_bci_offset); 128 assert(beg_bci <= end_bci, "inconsistent exception table"); 129 if (beg_bci <= throw_bci && throw_bci < end_bci) { 130 // exception handler bci range covers throw_bci => investigate further 131 int handler_bci = table->int_at(i + handler_bci_offset); 132 int klass_index = table->int_at(i + klass_index_offset); 133 if (klass_index == 0) { 134 return handler_bci; 135 } else if (ex_klass.is_null()) { 136 return handler_bci; 137 } else { 138 // we know the exception class => get the constraint class 139 // this may require loading of the constraint class; if verification 140 // fails or some other exception occurs, return handler_bci 141 klassOop k = pool->klass_at(klass_index, CHECK_(handler_bci)); 142 KlassHandle klass = KlassHandle(THREAD, k); 143 assert(klass.not_null(), "klass not loaded"); 144 if (ex_klass->is_subtype_of(klass())) { 145 return handler_bci; 146 } 147 } 148 } 149 } 150 151 return -1; 152 } 153 154 void methodOopDesc::mask_for(int bci, InterpreterOopMap* mask) { 155 156 Thread* myThread = Thread::current(); 157 methodHandle h_this(myThread, this); 158 #ifdef ASSERT 159 bool has_capability = myThread->is_VM_thread() || 160 myThread->is_ConcurrentGC_thread() || 161 myThread->is_GC_task_thread(); 162 163 if (!has_capability) { 164 if (!VerifyStack && !VerifyLastFrame) { 165 // verify stack calls this outside VM thread 166 warning("oopmap should only be accessed by the " 167 "VM, GC task or CMS threads (or during debugging)"); 168 InterpreterOopMap local_mask; 169 instanceKlass::cast(method_holder())->mask_for(h_this, bci, &local_mask); 170 local_mask.print(); 171 } 172 } 173 #endif 174 instanceKlass::cast(method_holder())->mask_for(h_this, bci, mask); 175 return; 176 } 177 178 179 int methodOopDesc::bci_from(address bcp) const { 180 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), "bcp doesn't belong to this method"); 181 return bcp - code_base(); 182 } 183 184 185 // Return (int)bcx if it appears to be a valid BCI. 186 // Return bci_from((address)bcx) if it appears to be a valid BCP. 187 // Return -1 otherwise. 188 // Used by profiling code, when invalid data is a possibility. 189 // The caller is responsible for validating the methodOop itself. 190 int methodOopDesc::validate_bci_from_bcx(intptr_t bcx) const { 191 // keep bci as -1 if not a valid bci 192 int bci = -1; 193 if (bcx == 0 || (address)bcx == code_base()) { 194 // code_size() may return 0 and we allow 0 here 195 // the method may be native 196 bci = 0; 197 } else if (frame::is_bci(bcx)) { 198 if (bcx < code_size()) { 199 bci = (int)bcx; 200 } 201 } else if (contains((address)bcx)) { 202 bci = (address)bcx - code_base(); 203 } 204 // Assert that if we have dodged any asserts, bci is negative. 205 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); 206 return bci; 207 } 208 209 address methodOopDesc::bcp_from(int bci) const { 210 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci"); 211 address bcp = code_base() + bci; 212 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); 213 return bcp; 214 } 215 216 217 int methodOopDesc::object_size(bool is_native) { 218 // If native, then include pointers for native_function and signature_handler 219 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; 220 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; 221 return align_object_size(header_size() + extra_words); 222 } 223 224 225 Symbol* methodOopDesc::klass_name() const { 226 klassOop k = method_holder(); 227 assert(k->is_klass(), "must be klass"); 228 instanceKlass* ik = (instanceKlass*) k->klass_part(); 229 return ik->name(); 230 } 231 232 233 void methodOopDesc::set_interpreter_kind() { 234 int kind = Interpreter::method_kind(methodOop(this)); 235 assert(kind != Interpreter::invalid, 236 "interpreter entry must be valid"); 237 set_interpreter_kind(kind); 238 } 239 240 241 // Attempt to return method oop to original state. Clear any pointers 242 // (to objects outside the shared spaces). We won't be able to predict 243 // where they should point in a new JVM. Further initialize some 244 // entries now in order allow them to be write protected later. 245 246 void methodOopDesc::remove_unshareable_info() { 247 unlink_method(); 248 set_interpreter_kind(); 249 } 250 251 252 bool methodOopDesc::was_executed_more_than(int n) { 253 // Invocation counter is reset when the methodOop is compiled. 254 // If the method has compiled code we therefore assume it has 255 // be excuted more than n times. 256 if (is_accessor() || is_empty_method() || (code() != NULL)) { 257 // interpreter doesn't bump invocation counter of trivial methods 258 // compiler does not bump invocation counter of compiled methods 259 return true; 260 } 261 else if (_invocation_counter.carry() || (method_data() != NULL && method_data()->invocation_counter()->carry())) { 262 // The carry bit is set when the counter overflows and causes 263 // a compilation to occur. We don't know how many times 264 // the counter has been reset, so we simply assume it has 265 // been executed more than n times. 266 return true; 267 } else { 268 return invocation_count() > n; 269 } 270 } 271 272 #ifndef PRODUCT 273 void methodOopDesc::print_invocation_count() { 274 if (is_static()) tty->print("static "); 275 if (is_final()) tty->print("final "); 276 if (is_synchronized()) tty->print("synchronized "); 277 if (is_native()) tty->print("native "); 278 method_holder()->klass_part()->name()->print_symbol_on(tty); 279 tty->print("."); 280 name()->print_symbol_on(tty); 281 signature()->print_symbol_on(tty); 282 283 if (WizardMode) { 284 // dump the size of the byte codes 285 tty->print(" {%d}", code_size()); 286 } 287 tty->cr(); 288 289 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); 290 tty->print_cr (" invocation_counter: %8d ", invocation_count()); 291 tty->print_cr (" backedge_counter: %8d ", backedge_count()); 292 if (CountCompiledCalls) { 293 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); 294 } 295 296 } 297 #endif 298 299 // Build a methodDataOop object to hold information about this method 300 // collected in the interpreter. 301 void methodOopDesc::build_interpreter_method_data(methodHandle method, TRAPS) { 302 // Do not profile method if current thread holds the pending list lock, 303 // which avoids deadlock for acquiring the MethodData_lock. 304 if (instanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) { 305 return; 306 } 307 308 // Grab a lock here to prevent multiple 309 // methodDataOops from being created. 310 MutexLocker ml(MethodData_lock, THREAD); 311 if (method->method_data() == NULL) { 312 methodDataOop method_data = oopFactory::new_methodData(method, CHECK); 313 method->set_method_data(method_data); 314 if (PrintMethodData && (Verbose || WizardMode)) { 315 ResourceMark rm(THREAD); 316 tty->print("build_interpreter_method_data for "); 317 method->print_name(tty); 318 tty->cr(); 319 // At the end of the run, the MDO, full of data, will be dumped. 320 } 321 } 322 } 323 324 void methodOopDesc::cleanup_inline_caches() { 325 // The current system doesn't use inline caches in the interpreter 326 // => nothing to do (keep this method around for future use) 327 } 328 329 330 int methodOopDesc::extra_stack_words() { 331 // not an inline function, to avoid a header dependency on Interpreter 332 return extra_stack_entries() * Interpreter::stackElementSize; 333 } 334 335 336 void methodOopDesc::compute_size_of_parameters(Thread *thread) { 337 ArgumentSizeComputer asc(signature()); 338 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); 339 } 340 341 #ifdef CC_INTERP 342 void methodOopDesc::set_result_index(BasicType type) { 343 _result_index = Interpreter::BasicType_as_index(type); 344 } 345 #endif 346 347 BasicType methodOopDesc::result_type() const { 348 ResultTypeFinder rtf(signature()); 349 return rtf.type(); 350 } 351 352 353 bool methodOopDesc::is_empty_method() const { 354 return code_size() == 1 355 && *code_base() == Bytecodes::_return; 356 } 357 358 359 bool methodOopDesc::is_vanilla_constructor() const { 360 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method 361 // which only calls the superclass vanilla constructor and possibly does stores of 362 // zero constants to local fields: 363 // 364 // aload_0 365 // invokespecial 366 // indexbyte1 367 // indexbyte2 368 // 369 // followed by an (optional) sequence of: 370 // 371 // aload_0 372 // aconst_null / iconst_0 / fconst_0 / dconst_0 373 // putfield 374 // indexbyte1 375 // indexbyte2 376 // 377 // followed by: 378 // 379 // return 380 381 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); 382 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); 383 int size = code_size(); 384 // Check if size match 385 if (size == 0 || size % 5 != 0) return false; 386 address cb = code_base(); 387 int last = size - 1; 388 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { 389 // Does not call superclass default constructor 390 return false; 391 } 392 // Check optional sequence 393 for (int i = 4; i < last; i += 5) { 394 if (cb[i] != Bytecodes::_aload_0) return false; 395 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; 396 if (cb[i+2] != Bytecodes::_putfield) return false; 397 } 398 return true; 399 } 400 401 402 bool methodOopDesc::compute_has_loops_flag() { 403 BytecodeStream bcs(methodOop(this)); 404 Bytecodes::Code bc; 405 406 while ((bc = bcs.next()) >= 0) { 407 switch( bc ) { 408 case Bytecodes::_ifeq: 409 case Bytecodes::_ifnull: 410 case Bytecodes::_iflt: 411 case Bytecodes::_ifle: 412 case Bytecodes::_ifne: 413 case Bytecodes::_ifnonnull: 414 case Bytecodes::_ifgt: 415 case Bytecodes::_ifge: 416 case Bytecodes::_if_icmpeq: 417 case Bytecodes::_if_icmpne: 418 case Bytecodes::_if_icmplt: 419 case Bytecodes::_if_icmpgt: 420 case Bytecodes::_if_icmple: 421 case Bytecodes::_if_icmpge: 422 case Bytecodes::_if_acmpeq: 423 case Bytecodes::_if_acmpne: 424 case Bytecodes::_goto: 425 case Bytecodes::_jsr: 426 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); 427 break; 428 429 case Bytecodes::_goto_w: 430 case Bytecodes::_jsr_w: 431 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); 432 break; 433 } 434 } 435 _access_flags.set_loops_flag_init(); 436 return _access_flags.has_loops(); 437 } 438 439 440 bool methodOopDesc::is_final_method() const { 441 // %%% Should return true for private methods also, 442 // since there is no way to override them. 443 return is_final() || Klass::cast(method_holder())->is_final(); 444 } 445 446 447 bool methodOopDesc::is_strict_method() const { 448 return is_strict(); 449 } 450 451 452 bool methodOopDesc::can_be_statically_bound() const { 453 if (is_final_method()) return true; 454 return vtable_index() == nonvirtual_vtable_index; 455 } 456 457 458 bool methodOopDesc::is_accessor() const { 459 if (code_size() != 5) return false; 460 if (size_of_parameters() != 1) return false; 461 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; 462 if (java_code_at(1) != Bytecodes::_getfield) return false; 463 if (java_code_at(4) != Bytecodes::_areturn && 464 java_code_at(4) != Bytecodes::_ireturn ) return false; 465 return true; 466 } 467 468 469 bool methodOopDesc::is_initializer() const { 470 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); 471 } 472 473 bool methodOopDesc::has_valid_initializer_flags() const { 474 return (is_static() || 475 instanceKlass::cast(method_holder())->major_version() < 51); 476 } 477 478 bool methodOopDesc::is_static_initializer() const { 479 // For classfiles version 51 or greater, ensure that the clinit method is 480 // static. Non-static methods with the name "<clinit>" are not static 481 // initializers. (older classfiles exempted for backward compatibility) 482 return name() == vmSymbols::class_initializer_name() && 483 has_valid_initializer_flags(); 484 } 485 486 487 objArrayHandle methodOopDesc::resolved_checked_exceptions_impl(methodOop this_oop, TRAPS) { 488 int length = this_oop->checked_exceptions_length(); 489 if (length == 0) { // common case 490 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); 491 } else { 492 methodHandle h_this(THREAD, this_oop); 493 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); 494 objArrayHandle mirrors (THREAD, m_oop); 495 for (int i = 0; i < length; i++) { 496 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe 497 klassOop k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); 498 assert(Klass::cast(k)->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); 499 mirrors->obj_at_put(i, Klass::cast(k)->java_mirror()); 500 } 501 return mirrors; 502 } 503 }; 504 505 506 int methodOopDesc::line_number_from_bci(int bci) const { 507 if (bci == SynchronizationEntryBCI) bci = 0; 508 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); 509 int best_bci = 0; 510 int best_line = -1; 511 512 if (has_linenumber_table()) { 513 // The line numbers are a short array of 2-tuples [start_pc, line_number]. 514 // Not necessarily sorted and not necessarily one-to-one. 515 CompressedLineNumberReadStream stream(compressed_linenumber_table()); 516 while (stream.read_pair()) { 517 if (stream.bci() == bci) { 518 // perfect match 519 return stream.line(); 520 } else { 521 // update best_bci/line 522 if (stream.bci() < bci && stream.bci() >= best_bci) { 523 best_bci = stream.bci(); 524 best_line = stream.line(); 525 } 526 } 527 } 528 } 529 return best_line; 530 } 531 532 533 bool methodOopDesc::is_klass_loaded_by_klass_index(int klass_index) const { 534 if( _constants->tag_at(klass_index).is_unresolved_klass() ) { 535 Thread *thread = Thread::current(); 536 Symbol* klass_name = _constants->klass_name_at(klass_index); 537 Handle loader(thread, instanceKlass::cast(method_holder())->class_loader()); 538 Handle prot (thread, Klass::cast(method_holder())->protection_domain()); 539 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; 540 } else { 541 return true; 542 } 543 } 544 545 546 bool methodOopDesc::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 547 int klass_index = _constants->klass_ref_index_at(refinfo_index); 548 if (must_be_resolved) { 549 // Make sure klass is resolved in constantpool. 550 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; 551 } 552 return is_klass_loaded_by_klass_index(klass_index); 553 } 554 555 556 void methodOopDesc::set_native_function(address function, bool post_event_flag) { 557 assert(function != NULL, "use clear_native_function to unregister natives"); 558 address* native_function = native_function_addr(); 559 560 // We can see racers trying to place the same native function into place. Once 561 // is plenty. 562 address current = *native_function; 563 if (current == function) return; 564 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && 565 function != NULL) { 566 // native_method_throw_unsatisfied_link_error_entry() should only 567 // be passed when post_event_flag is false. 568 assert(function != 569 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 570 "post_event_flag mis-match"); 571 572 // post the bind event, and possible change the bind function 573 JvmtiExport::post_native_method_bind(this, &function); 574 } 575 *native_function = function; 576 // This function can be called more than once. We must make sure that we always 577 // use the latest registered method -> check if a stub already has been generated. 578 // If so, we have to make it not_entrant. 579 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates 580 if (nm != NULL) { 581 nm->make_not_entrant(); 582 } 583 } 584 585 586 bool methodOopDesc::has_native_function() const { 587 address func = native_function(); 588 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); 589 } 590 591 592 void methodOopDesc::clear_native_function() { 593 set_native_function( 594 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 595 !native_bind_event_is_interesting); 596 clear_code(); 597 } 598 599 address methodOopDesc::critical_native_function() { 600 methodHandle mh(this); 601 return NativeLookup::lookup_critical_entry(mh); 602 } 603 604 605 void methodOopDesc::set_signature_handler(address handler) { 606 address* signature_handler = signature_handler_addr(); 607 *signature_handler = handler; 608 } 609 610 611 bool methodOopDesc::is_not_compilable(int comp_level) const { 612 if (is_method_handle_invoke()) { 613 // compilers must recognize this method specially, or not at all 614 return true; 615 } 616 if (number_of_breakpoints() > 0) { 617 return true; 618 } 619 if (comp_level == CompLevel_any) { 620 return is_not_c1_compilable() || is_not_c2_compilable(); 621 } 622 if (is_c1_compile(comp_level)) { 623 return is_not_c1_compilable(); 624 } 625 if (is_c2_compile(comp_level)) { 626 return is_not_c2_compilable(); 627 } 628 return false; 629 } 630 631 // call this when compiler finds that this method is not compilable 632 void methodOopDesc::set_not_compilable(int comp_level, bool report) { 633 if (PrintCompilation && report) { 634 ttyLocker ttyl; 635 tty->print("made not compilable "); 636 this->print_short_name(tty); 637 int size = this->code_size(); 638 if (size > 0) 639 tty->print(" (%d bytes)", size); 640 tty->cr(); 641 } 642 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { 643 ttyLocker ttyl; 644 xtty->begin_elem("make_not_compilable thread='%d'", (int) os::current_thread_id()); 645 xtty->method(methodOop(this)); 646 xtty->stamp(); 647 xtty->end_elem(); 648 } 649 if (comp_level == CompLevel_all) { 650 set_not_c1_compilable(); 651 set_not_c2_compilable(); 652 } else { 653 if (is_c1_compile(comp_level)) { 654 set_not_c1_compilable(); 655 } else 656 if (is_c2_compile(comp_level)) { 657 set_not_c2_compilable(); 658 } 659 } 660 CompilationPolicy::policy()->disable_compilation(this); 661 } 662 663 // Revert to using the interpreter and clear out the nmethod 664 void methodOopDesc::clear_code() { 665 666 // this may be NULL if c2i adapters have not been made yet 667 // Only should happen at allocate time. 668 if (_adapter == NULL) { 669 _from_compiled_entry = NULL; 670 } else { 671 _from_compiled_entry = _adapter->get_c2i_entry(); 672 } 673 OrderAccess::storestore(); 674 _from_interpreted_entry = _i2i_entry; 675 OrderAccess::storestore(); 676 _code = NULL; 677 } 678 679 // Called by class data sharing to remove any entry points (which are not shared) 680 void methodOopDesc::unlink_method() { 681 _code = NULL; 682 _i2i_entry = NULL; 683 _from_interpreted_entry = NULL; 684 if (is_native()) { 685 *native_function_addr() = NULL; 686 set_signature_handler(NULL); 687 } 688 NOT_PRODUCT(set_compiled_invocation_count(0);) 689 invocation_counter()->reset(); 690 backedge_counter()->reset(); 691 _adapter = NULL; 692 _from_compiled_entry = NULL; 693 assert(_method_data == NULL, "unexpected method data?"); 694 set_method_data(NULL); 695 set_interpreter_throwout_count(0); 696 set_interpreter_invocation_count(0); 697 } 698 699 // Called when the method_holder is getting linked. Setup entrypoints so the method 700 // is ready to be called from interpreter, compiler, and vtables. 701 void methodOopDesc::link_method(methodHandle h_method, TRAPS) { 702 // If the code cache is full, we may reenter this function for the 703 // leftover methods that weren't linked. 704 if (_i2i_entry != NULL) return; 705 706 assert(_adapter == NULL, "init'd to NULL" ); 707 assert( _code == NULL, "nothing compiled yet" ); 708 709 // Setup interpreter entrypoint 710 assert(this == h_method(), "wrong h_method()" ); 711 address entry = Interpreter::entry_for_method(h_method); 712 assert(entry != NULL, "interpreter entry must be non-null"); 713 // Sets both _i2i_entry and _from_interpreted_entry 714 set_interpreter_entry(entry); 715 if (is_native() && !is_method_handle_invoke()) { 716 set_native_function( 717 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), 718 !native_bind_event_is_interesting); 719 } 720 721 // Setup compiler entrypoint. This is made eagerly, so we do not need 722 // special handling of vtables. An alternative is to make adapters more 723 // lazily by calling make_adapter() from from_compiled_entry() for the 724 // normal calls. For vtable calls life gets more complicated. When a 725 // call-site goes mega-morphic we need adapters in all methods which can be 726 // called from the vtable. We need adapters on such methods that get loaded 727 // later. Ditto for mega-morphic itable calls. If this proves to be a 728 // problem we'll make these lazily later. 729 (void) make_adapters(h_method, CHECK); 730 731 // ONLY USE the h_method now as make_adapter may have blocked 732 733 } 734 735 address methodOopDesc::make_adapters(methodHandle mh, TRAPS) { 736 // Adapters for compiled code are made eagerly here. They are fairly 737 // small (generally < 100 bytes) and quick to make (and cached and shared) 738 // so making them eagerly shouldn't be too expensive. 739 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); 740 if (adapter == NULL ) { 741 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); 742 } 743 744 mh->set_adapter_entry(adapter); 745 mh->_from_compiled_entry = adapter->get_c2i_entry(); 746 return adapter->get_c2i_entry(); 747 } 748 749 // The verified_code_entry() must be called when a invoke is resolved 750 // on this method. 751 752 // It returns the compiled code entry point, after asserting not null. 753 // This function is called after potential safepoints so that nmethod 754 // or adapter that it points to is still live and valid. 755 // This function must not hit a safepoint! 756 address methodOopDesc::verified_code_entry() { 757 debug_only(No_Safepoint_Verifier nsv;) 758 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 759 if (code == NULL && UseCodeCacheFlushing) { 760 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this); 761 if (saved_code != NULL) { 762 methodHandle method(this); 763 assert( ! saved_code->is_osr_method(), "should not get here for osr" ); 764 set_code( method, saved_code ); 765 } 766 } 767 768 assert(_from_compiled_entry != NULL, "must be set"); 769 return _from_compiled_entry; 770 } 771 772 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 773 // (could be racing a deopt). 774 // Not inline to avoid circular ref. 775 bool methodOopDesc::check_code() const { 776 // cached in a register or local. There's a race on the value of the field. 777 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); 778 return code == NULL || (code->method() == NULL) || (code->method() == (methodOop)this && !code->is_osr_method()); 779 } 780 781 // Install compiled code. Instantly it can execute. 782 void methodOopDesc::set_code(methodHandle mh, nmethod *code) { 783 assert( code, "use clear_code to remove code" ); 784 assert( mh->check_code(), "" ); 785 786 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); 787 788 // These writes must happen in this order, because the interpreter will 789 // directly jump to from_interpreted_entry which jumps to an i2c adapter 790 // which jumps to _from_compiled_entry. 791 mh->_code = code; // Assign before allowing compiled code to exec 792 793 int comp_level = code->comp_level(); 794 // In theory there could be a race here. In practice it is unlikely 795 // and not worth worrying about. 796 if (comp_level > mh->highest_comp_level()) { 797 mh->set_highest_comp_level(comp_level); 798 } 799 800 OrderAccess::storestore(); 801 #ifdef SHARK 802 mh->_from_interpreted_entry = code->insts_begin(); 803 #else 804 mh->_from_compiled_entry = code->verified_entry_point(); 805 OrderAccess::storestore(); 806 // Instantly compiled code can execute. 807 mh->_from_interpreted_entry = mh->get_i2c_entry(); 808 #endif // SHARK 809 810 } 811 812 813 bool methodOopDesc::is_overridden_in(klassOop k) const { 814 instanceKlass* ik = instanceKlass::cast(k); 815 816 if (ik->is_interface()) return false; 817 818 // If method is an interface, we skip it - except if it 819 // is a miranda method 820 if (instanceKlass::cast(method_holder())->is_interface()) { 821 // Check that method is not a miranda method 822 if (ik->lookup_method(name(), signature()) == NULL) { 823 // No implementation exist - so miranda method 824 return false; 825 } 826 return true; 827 } 828 829 assert(ik->is_subclass_of(method_holder()), "should be subklass"); 830 assert(ik->vtable() != NULL, "vtable should exist"); 831 if (vtable_index() == nonvirtual_vtable_index) { 832 return false; 833 } else { 834 methodOop vt_m = ik->method_at_vtable(vtable_index()); 835 return vt_m != methodOop(this); 836 } 837 } 838 839 840 // give advice about whether this methodOop should be cached or not 841 bool methodOopDesc::should_not_be_cached() const { 842 if (is_old()) { 843 // This method has been redefined. It is either EMCP or obsolete 844 // and we don't want to cache it because that would pin the method 845 // down and prevent it from being collectible if and when it 846 // finishes executing. 847 return true; 848 } 849 850 if (mark()->should_not_be_cached()) { 851 // It is either not safe or not a good idea to cache this 852 // method at this time because of the state of the embedded 853 // markOop. See markOop.cpp for the gory details. 854 return true; 855 } 856 857 // caching this method should be just fine 858 return false; 859 } 860 861 bool methodOopDesc::is_method_handle_invoke_name(vmSymbols::SID name_sid) { 862 switch (name_sid) { 863 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeExact_name): 864 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): 865 return true; 866 } 867 if (AllowInvokeGeneric 868 && name_sid == vmSymbols::VM_SYMBOL_ENUM_NAME(invokeGeneric_name)) 869 return true; 870 return false; 871 } 872 873 // Constant pool structure for invoke methods: 874 enum { 875 _imcp_invoke_name = 1, // utf8: 'invokeExact' or 'invokeGeneric' 876 _imcp_invoke_signature, // utf8: (variable Symbol*) 877 _imcp_method_type_value, // string: (variable java/lang/invoke/MethodType, sic) 878 _imcp_limit 879 }; 880 881 oop methodOopDesc::method_handle_type() const { 882 if (!is_method_handle_invoke()) { assert(false, "caller resp."); return NULL; } 883 oop mt = constants()->resolved_string_at(_imcp_method_type_value); 884 assert(mt->klass() == SystemDictionary::MethodType_klass(), ""); 885 return mt; 886 } 887 888 jint* methodOopDesc::method_type_offsets_chain() { 889 static jint pchase[] = { -1, -1, -1 }; 890 if (pchase[0] == -1) { 891 jint step0 = in_bytes(constants_offset()); 892 jint step1 = (constantPoolOopDesc::header_size() + _imcp_method_type_value) * HeapWordSize; 893 // do this in reverse to avoid races: 894 OrderAccess::release_store(&pchase[1], step1); 895 OrderAccess::release_store(&pchase[0], step0); 896 } 897 return pchase; 898 } 899 900 //------------------------------------------------------------------------------ 901 // methodOopDesc::is_method_handle_adapter 902 // 903 // Tests if this method is an internal adapter frame from the 904 // MethodHandleCompiler. 905 // Must be consistent with MethodHandleCompiler::get_method_oop(). 906 bool methodOopDesc::is_method_handle_adapter() const { 907 if (is_synthetic() && 908 !is_native() && // has code from MethodHandleCompiler 909 is_method_handle_invoke_name(name()) && 910 MethodHandleCompiler::klass_is_method_handle_adapter_holder(method_holder())) { 911 assert(!is_method_handle_invoke(), "disjoint"); 912 return true; 913 } else { 914 return false; 915 } 916 } 917 918 methodHandle methodOopDesc::make_invoke_method(KlassHandle holder, 919 Symbol* name, 920 Symbol* signature, 921 Handle method_type, TRAPS) { 922 ResourceMark rm; 923 methodHandle empty; 924 925 assert(holder() == SystemDictionary::MethodHandle_klass(), 926 "must be a JSR 292 magic type"); 927 928 if (TraceMethodHandles) { 929 tty->print("Creating invoke method for "); 930 signature->print_value(); 931 tty->cr(); 932 } 933 934 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) 935 name->increment_refcount(); 936 signature->increment_refcount(); 937 938 // record non-BCP method types in the constant pool 939 GrowableArray<KlassHandle>* extra_klasses = NULL; 940 for (int i = -1, len = java_lang_invoke_MethodType::ptype_count(method_type()); i < len; i++) { 941 oop ptype = (i == -1 942 ? java_lang_invoke_MethodType::rtype(method_type()) 943 : java_lang_invoke_MethodType::ptype(method_type(), i)); 944 klassOop klass = check_non_bcp_klass(java_lang_Class::as_klassOop(ptype)); 945 if (klass != NULL) { 946 if (extra_klasses == NULL) 947 extra_klasses = new GrowableArray<KlassHandle>(len+1); 948 bool dup = false; 949 for (int j = 0; j < extra_klasses->length(); j++) { 950 if (extra_klasses->at(j) == klass) { dup = true; break; } 951 } 952 if (!dup) 953 extra_klasses->append(KlassHandle(THREAD, klass)); 954 } 955 } 956 957 int extra_klass_count = (extra_klasses == NULL ? 0 : extra_klasses->length()); 958 int cp_length = _imcp_limit + extra_klass_count; 959 constantPoolHandle cp; 960 { 961 constantPoolOop cp_oop = oopFactory::new_constantPool(cp_length, IsSafeConc, CHECK_(empty)); 962 cp = constantPoolHandle(THREAD, cp_oop); 963 } 964 cp->symbol_at_put(_imcp_invoke_name, name); 965 cp->symbol_at_put(_imcp_invoke_signature, signature); 966 cp->string_at_put(_imcp_method_type_value, Universe::the_null_string()); 967 for (int j = 0; j < extra_klass_count; j++) { 968 KlassHandle klass = extra_klasses->at(j); 969 cp->klass_at_put(_imcp_limit + j, klass()); 970 } 971 cp->set_preresolution(); 972 cp->set_pool_holder(holder()); 973 974 // set up the fancy stuff: 975 cp->pseudo_string_at_put(_imcp_method_type_value, method_type()); 976 methodHandle m; 977 { 978 int flags_bits = (JVM_MH_INVOKE_BITS | JVM_ACC_PUBLIC | JVM_ACC_FINAL); 979 methodOop m_oop = oopFactory::new_method(0, accessFlags_from(flags_bits), 980 0, 0, 0, IsSafeConc, CHECK_(empty)); 981 m = methodHandle(THREAD, m_oop); 982 } 983 m->set_constants(cp()); 984 m->set_name_index(_imcp_invoke_name); 985 m->set_signature_index(_imcp_invoke_signature); 986 assert(is_method_handle_invoke_name(m->name()), ""); 987 assert(m->signature() == signature, ""); 988 assert(m->is_method_handle_invoke(), ""); 989 #ifdef CC_INTERP 990 ResultTypeFinder rtf(signature); 991 m->set_result_index(rtf.type()); 992 #endif 993 m->compute_size_of_parameters(THREAD); 994 m->set_exception_table(Universe::the_empty_int_array()); 995 m->init_intrinsic_id(); 996 assert(m->intrinsic_id() == vmIntrinsics::_invokeExact || 997 m->intrinsic_id() == vmIntrinsics::_invokeGeneric, "must be an invoker"); 998 999 // Finally, set up its entry points. 1000 assert(m->method_handle_type() == method_type(), ""); 1001 assert(m->can_be_statically_bound(), ""); 1002 m->set_vtable_index(methodOopDesc::nonvirtual_vtable_index); 1003 m->link_method(m, CHECK_(empty)); 1004 1005 #ifdef ASSERT 1006 // Make sure the pointer chase works. 1007 address p = (address) m(); 1008 for (jint* pchase = method_type_offsets_chain(); (*pchase) != -1; pchase++) { 1009 p = *(address*)(p + (*pchase)); 1010 } 1011 assert((oop)p == method_type(), "pointer chase is correct"); 1012 #endif 1013 1014 if (TraceMethodHandles && (Verbose || WizardMode)) 1015 m->print_on(tty); 1016 1017 return m; 1018 } 1019 1020 klassOop methodOopDesc::check_non_bcp_klass(klassOop klass) { 1021 if (klass != NULL && Klass::cast(klass)->class_loader() != NULL) { 1022 if (Klass::cast(klass)->oop_is_objArray()) 1023 klass = objArrayKlass::cast(klass)->bottom_klass(); 1024 return klass; 1025 } 1026 return NULL; 1027 } 1028 1029 1030 methodHandle methodOopDesc:: clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, 1031 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { 1032 // Code below does not work for native methods - they should never get rewritten anyway 1033 assert(!m->is_native(), "cannot rewrite native methods"); 1034 // Allocate new methodOop 1035 AccessFlags flags = m->access_flags(); 1036 int checked_exceptions_len = m->checked_exceptions_length(); 1037 int localvariable_len = m->localvariable_table_length(); 1038 // Allocate newm_oop with the is_conc_safe parameter set 1039 // to IsUnsafeConc to indicate that newm_oop is not yet 1040 // safe for concurrent processing by a GC. 1041 methodOop newm_oop = oopFactory::new_method(new_code_length, 1042 flags, 1043 new_compressed_linenumber_size, 1044 localvariable_len, 1045 checked_exceptions_len, 1046 IsUnsafeConc, 1047 CHECK_(methodHandle())); 1048 methodHandle newm (THREAD, newm_oop); 1049 NOT_PRODUCT(int nmsz = newm->is_parsable() ? newm->size() : -1;) 1050 int new_method_size = newm->method_size(); 1051 // Create a shallow copy of methodOopDesc part, but be careful to preserve the new constMethodOop 1052 constMethodOop newcm = newm->constMethod(); 1053 NOT_PRODUCT(int ncmsz = newcm->is_parsable() ? newcm->size() : -1;) 1054 int new_const_method_size = newm->constMethod()->object_size(); 1055 1056 memcpy(newm(), m(), sizeof(methodOopDesc)); 1057 // Create shallow copy of constMethodOopDesc, but be careful to preserve the methodOop 1058 // is_conc_safe is set to false because that is the value of 1059 // is_conc_safe initialzied into newcm and the copy should 1060 // not overwrite that value. During the window during which it is 1061 // tagged as unsafe, some extra work could be needed during precleaning 1062 // or concurrent marking but those phases will be correct. Setting and 1063 // resetting is done in preference to a careful copying into newcm to 1064 // avoid having to know the precise layout of a constMethodOop. 1065 m->constMethod()->set_is_conc_safe(oopDesc::IsUnsafeConc); 1066 assert(m->constMethod()->is_parsable(), "Should remain parsable"); 1067 1068 // NOTE: this is a reachable object that transiently signals "conc_unsafe" 1069 // However, no allocations are done during this window 1070 // during which it is tagged conc_unsafe, so we are assured that any concurrent 1071 // thread will not wait forever for the object to revert to "conc_safe". 1072 // Further, any such conc_unsafe object will indicate a stable size 1073 // through the transition. 1074 memcpy(newcm, m->constMethod(), sizeof(constMethodOopDesc)); 1075 m->constMethod()->set_is_conc_safe(oopDesc::IsSafeConc); 1076 assert(m->constMethod()->is_parsable(), "Should remain parsable"); 1077 1078 // Reset correct method/const method, method size, and parameter info 1079 newcm->set_method(newm()); 1080 newm->set_constMethod(newcm); 1081 assert(newcm->method() == newm(), "check"); 1082 newm->constMethod()->set_code_size(new_code_length); 1083 newm->constMethod()->set_constMethod_size(new_const_method_size); 1084 newm->set_method_size(new_method_size); 1085 assert(newm->code_size() == new_code_length, "check"); 1086 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); 1087 assert(newm->localvariable_table_length() == localvariable_len, "check"); 1088 // Copy new byte codes 1089 memcpy(newm->code_base(), new_code, new_code_length); 1090 // Copy line number table 1091 if (new_compressed_linenumber_size > 0) { 1092 memcpy(newm->compressed_linenumber_table(), 1093 new_compressed_linenumber_table, 1094 new_compressed_linenumber_size); 1095 } 1096 // Copy checked_exceptions 1097 if (checked_exceptions_len > 0) { 1098 memcpy(newm->checked_exceptions_start(), 1099 m->checked_exceptions_start(), 1100 checked_exceptions_len * sizeof(CheckedExceptionElement)); 1101 } 1102 // Copy local variable number table 1103 if (localvariable_len > 0) { 1104 memcpy(newm->localvariable_table_start(), 1105 m->localvariable_table_start(), 1106 localvariable_len * sizeof(LocalVariableTableElement)); 1107 } 1108 1109 // Only set is_conc_safe to true when changes to newcm are 1110 // complete. 1111 assert(!newm->is_parsable() || nmsz < 0 || newm->size() == nmsz, "newm->size() inconsistency"); 1112 assert(!newcm->is_parsable() || ncmsz < 0 || newcm->size() == ncmsz, "newcm->size() inconsistency"); 1113 newcm->set_is_conc_safe(true); 1114 return newm; 1115 } 1116 1117 vmSymbols::SID methodOopDesc::klass_id_for_intrinsics(klassOop holder) { 1118 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics 1119 // because we are not loading from core libraries 1120 if (instanceKlass::cast(holder)->class_loader() != NULL) 1121 return vmSymbols::NO_SID; // regardless of name, no intrinsics here 1122 1123 // see if the klass name is well-known: 1124 Symbol* klass_name = instanceKlass::cast(holder)->name(); 1125 return vmSymbols::find_sid(klass_name); 1126 } 1127 1128 void methodOopDesc::init_intrinsic_id() { 1129 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); 1130 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); 1131 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); 1132 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); 1133 1134 // the klass name is well-known: 1135 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); 1136 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); 1137 1138 // ditto for method and signature: 1139 vmSymbols::SID name_id = vmSymbols::find_sid(name()); 1140 if (name_id == vmSymbols::NO_SID) return; 1141 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); 1142 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) 1143 && sig_id == vmSymbols::NO_SID) return; 1144 jshort flags = access_flags().as_short(); 1145 1146 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1147 if (id != vmIntrinsics::_none) { 1148 set_intrinsic_id(id); 1149 return; 1150 } 1151 1152 // A few slightly irregular cases: 1153 switch (klass_id) { 1154 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): 1155 // Second chance: check in regular Math. 1156 switch (name_id) { 1157 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): 1158 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): 1159 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): 1160 // pretend it is the corresponding method in the non-strict class: 1161 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); 1162 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); 1163 break; 1164 } 1165 break; 1166 1167 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. 1168 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): 1169 if (is_static() || !is_native()) break; 1170 switch (name_id) { 1171 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeGeneric_name): 1172 if (!AllowInvokeGeneric) break; 1173 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): 1174 id = vmIntrinsics::_invokeGeneric; 1175 break; 1176 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeExact_name): 1177 id = vmIntrinsics::_invokeExact; 1178 break; 1179 } 1180 break; 1181 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InvokeDynamic): 1182 if (!is_static() || !is_native()) break; 1183 id = vmIntrinsics::_invokeDynamic; 1184 break; 1185 } 1186 1187 if (id != vmIntrinsics::_none) { 1188 // Set up its iid. It is an alias method. 1189 set_intrinsic_id(id); 1190 return; 1191 } 1192 } 1193 1194 // These two methods are static since a GC may move the methodOopDesc 1195 bool methodOopDesc::load_signature_classes(methodHandle m, TRAPS) { 1196 bool sig_is_loaded = true; 1197 Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader()); 1198 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain()); 1199 ResourceMark rm(THREAD); 1200 Symbol* signature = m->signature(); 1201 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1202 if (ss.is_object()) { 1203 Symbol* sym = ss.as_symbol(CHECK_(false)); 1204 Symbol* name = sym; 1205 klassOop klass = SystemDictionary::resolve_or_null(name, class_loader, 1206 protection_domain, THREAD); 1207 // We are loading classes eagerly. If a ClassNotFoundException or 1208 // a LinkageError was generated, be sure to ignore it. 1209 if (HAS_PENDING_EXCEPTION) { 1210 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || 1211 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { 1212 CLEAR_PENDING_EXCEPTION; 1213 } else { 1214 return false; 1215 } 1216 } 1217 if( klass == NULL) { sig_is_loaded = false; } 1218 } 1219 } 1220 return sig_is_loaded; 1221 } 1222 1223 bool methodOopDesc::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { 1224 Handle class_loader(THREAD, instanceKlass::cast(m->method_holder())->class_loader()); 1225 Handle protection_domain(THREAD, Klass::cast(m->method_holder())->protection_domain()); 1226 ResourceMark rm(THREAD); 1227 Symbol* signature = m->signature(); 1228 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { 1229 if (ss.type() == T_OBJECT) { 1230 Symbol* name = ss.as_symbol_or_null(); 1231 if (name == NULL) return true; 1232 klassOop klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); 1233 if (klass == NULL) return true; 1234 } 1235 } 1236 return false; 1237 } 1238 1239 // Exposed so field engineers can debug VM 1240 void methodOopDesc::print_short_name(outputStream* st) { 1241 ResourceMark rm; 1242 #ifdef PRODUCT 1243 st->print(" %s::", method_holder()->klass_part()->external_name()); 1244 #else 1245 st->print(" %s::", method_holder()->klass_part()->internal_name()); 1246 #endif 1247 name()->print_symbol_on(st); 1248 if (WizardMode) signature()->print_symbol_on(st); 1249 } 1250 1251 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1252 static void reorder_based_on_method_index(objArrayOop methods, 1253 objArrayOop annotations, 1254 GrowableArray<oop>* temp_array) { 1255 if (annotations == NULL) { 1256 return; 1257 } 1258 1259 int length = methods->length(); 1260 int i; 1261 // Copy to temp array 1262 temp_array->clear(); 1263 for (i = 0; i < length; i++) { 1264 temp_array->append(annotations->obj_at(i)); 1265 } 1266 1267 // Copy back using old method indices 1268 for (i = 0; i < length; i++) { 1269 methodOop m = (methodOop) methods->obj_at(i); 1270 annotations->obj_at_put(i, temp_array->at(m->method_idnum())); 1271 } 1272 } 1273 1274 // Comparer for sorting an object array containing 1275 // methodOops. 1276 // Used non-template method_comparator methods since 1277 // Visual Studio 2003 compiler generates incorrect 1278 // optimized code for it. 1279 static int method_comparator_narrowOop(narrowOop a, narrowOop b) { 1280 methodOop m = (methodOop)oopDesc::decode_heap_oop_not_null(a); 1281 methodOop n = (methodOop)oopDesc::decode_heap_oop_not_null(b); 1282 return m->name()->fast_compare(n->name()); 1283 } 1284 static int method_comparator_oop(oop a, oop b) { 1285 methodOop m = (methodOop)a; 1286 methodOop n = (methodOop)b; 1287 return m->name()->fast_compare(n->name()); 1288 } 1289 1290 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array 1291 void methodOopDesc::sort_methods(objArrayOop methods, 1292 objArrayOop methods_annotations, 1293 objArrayOop methods_parameter_annotations, 1294 objArrayOop methods_default_annotations, 1295 bool idempotent) { 1296 int length = methods->length(); 1297 if (length > 1) { 1298 bool do_annotations = false; 1299 if (methods_annotations != NULL || 1300 methods_parameter_annotations != NULL || 1301 methods_default_annotations != NULL) { 1302 do_annotations = true; 1303 } 1304 if (do_annotations) { 1305 // Remember current method ordering so we can reorder annotations 1306 for (int i = 0; i < length; i++) { 1307 methodOop m = (methodOop) methods->obj_at(i); 1308 m->set_method_idnum(i); 1309 } 1310 } 1311 { 1312 No_Safepoint_Verifier nsv; 1313 if (UseCompressedOops) { 1314 QuickSort::sort<narrowOop>((narrowOop*)(methods->base()), length, method_comparator_narrowOop, idempotent); 1315 } else { 1316 QuickSort::sort<oop>((oop*)(methods->base()), length, method_comparator_oop, idempotent); 1317 } 1318 if (UseConcMarkSweepGC) { 1319 // For CMS we need to dirty the cards for the array 1320 BarrierSet* bs = Universe::heap()->barrier_set(); 1321 assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt"); 1322 bs->write_ref_array(methods->base(), length); 1323 } 1324 } 1325 1326 // Sort annotations if necessary 1327 assert(methods_annotations == NULL || methods_annotations->length() == methods->length(), ""); 1328 assert(methods_parameter_annotations == NULL || methods_parameter_annotations->length() == methods->length(), ""); 1329 assert(methods_default_annotations == NULL || methods_default_annotations->length() == methods->length(), ""); 1330 if (do_annotations) { 1331 ResourceMark rm; 1332 // Allocate temporary storage 1333 GrowableArray<oop>* temp_array = new GrowableArray<oop>(length); 1334 reorder_based_on_method_index(methods, methods_annotations, temp_array); 1335 reorder_based_on_method_index(methods, methods_parameter_annotations, temp_array); 1336 reorder_based_on_method_index(methods, methods_default_annotations, temp_array); 1337 } 1338 1339 // Reset method ordering 1340 for (int i = 0; i < length; i++) { 1341 methodOop m = (methodOop) methods->obj_at(i); 1342 m->set_method_idnum(i); 1343 } 1344 } 1345 } 1346 1347 1348 //----------------------------------------------------------------------------------- 1349 // Non-product code 1350 1351 #ifndef PRODUCT 1352 class SignatureTypePrinter : public SignatureTypeNames { 1353 private: 1354 outputStream* _st; 1355 bool _use_separator; 1356 1357 void type_name(const char* name) { 1358 if (_use_separator) _st->print(", "); 1359 _st->print(name); 1360 _use_separator = true; 1361 } 1362 1363 public: 1364 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { 1365 _st = st; 1366 _use_separator = false; 1367 } 1368 1369 void print_parameters() { _use_separator = false; iterate_parameters(); } 1370 void print_returntype() { _use_separator = false; iterate_returntype(); } 1371 }; 1372 1373 1374 void methodOopDesc::print_name(outputStream* st) { 1375 Thread *thread = Thread::current(); 1376 ResourceMark rm(thread); 1377 SignatureTypePrinter sig(signature(), st); 1378 st->print("%s ", is_static() ? "static" : "virtual"); 1379 sig.print_returntype(); 1380 st->print(" %s.", method_holder()->klass_part()->internal_name()); 1381 name()->print_symbol_on(st); 1382 st->print("("); 1383 sig.print_parameters(); 1384 st->print(")"); 1385 } 1386 1387 1388 void methodOopDesc::print_codes_on(outputStream* st) const { 1389 print_codes_on(0, code_size(), st); 1390 } 1391 1392 void methodOopDesc::print_codes_on(int from, int to, outputStream* st) const { 1393 Thread *thread = Thread::current(); 1394 ResourceMark rm(thread); 1395 methodHandle mh (thread, (methodOop)this); 1396 BytecodeStream s(mh); 1397 s.set_interval(from, to); 1398 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); 1399 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); 1400 } 1401 #endif // not PRODUCT 1402 1403 1404 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas 1405 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) 1406 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used 1407 // as end-of-stream terminator. 1408 1409 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { 1410 // bci and line number does not compress into single byte. 1411 // Write out escape character and use regular compression for bci and line number. 1412 write_byte((jubyte)0xFF); 1413 write_signed_int(bci_delta); 1414 write_signed_int(line_delta); 1415 } 1416 1417 // See comment in methodOop.hpp which explains why this exists. 1418 #if defined(_M_AMD64) && _MSC_VER >= 1400 1419 #pragma optimize("", off) 1420 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { 1421 write_pair_inline(bci, line); 1422 } 1423 #pragma optimize("", on) 1424 #endif 1425 1426 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { 1427 _bci = 0; 1428 _line = 0; 1429 }; 1430 1431 1432 bool CompressedLineNumberReadStream::read_pair() { 1433 jubyte next = read_byte(); 1434 // Check for terminator 1435 if (next == 0) return false; 1436 if (next == 0xFF) { 1437 // Escape character, regular compression used 1438 _bci += read_signed_int(); 1439 _line += read_signed_int(); 1440 } else { 1441 // Single byte compression used 1442 _bci += next >> 3; 1443 _line += next & 0x7; 1444 } 1445 return true; 1446 } 1447 1448 1449 Bytecodes::Code methodOopDesc::orig_bytecode_at(int bci) const { 1450 BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints(); 1451 for (; bp != NULL; bp = bp->next()) { 1452 if (bp->match(this, bci)) { 1453 return bp->orig_bytecode(); 1454 } 1455 } 1456 ShouldNotReachHere(); 1457 return Bytecodes::_shouldnotreachhere; 1458 } 1459 1460 void methodOopDesc::set_orig_bytecode_at(int bci, Bytecodes::Code code) { 1461 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); 1462 BreakpointInfo* bp = instanceKlass::cast(method_holder())->breakpoints(); 1463 for (; bp != NULL; bp = bp->next()) { 1464 if (bp->match(this, bci)) { 1465 bp->set_orig_bytecode(code); 1466 // and continue, in case there is more than one 1467 } 1468 } 1469 } 1470 1471 void methodOopDesc::set_breakpoint(int bci) { 1472 instanceKlass* ik = instanceKlass::cast(method_holder()); 1473 BreakpointInfo *bp = new BreakpointInfo(this, bci); 1474 bp->set_next(ik->breakpoints()); 1475 ik->set_breakpoints(bp); 1476 // do this last: 1477 bp->set(this); 1478 } 1479 1480 static void clear_matches(methodOop m, int bci) { 1481 instanceKlass* ik = instanceKlass::cast(m->method_holder()); 1482 BreakpointInfo* prev_bp = NULL; 1483 BreakpointInfo* next_bp; 1484 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { 1485 next_bp = bp->next(); 1486 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). 1487 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { 1488 // do this first: 1489 bp->clear(m); 1490 // unhook it 1491 if (prev_bp != NULL) 1492 prev_bp->set_next(next_bp); 1493 else 1494 ik->set_breakpoints(next_bp); 1495 delete bp; 1496 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods 1497 // at same location. So we have multiple matching (method_index and bci) 1498 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one 1499 // breakpoint for clear_breakpoint request and keep all other method versions 1500 // BreakpointInfo for future clear_breakpoint request. 1501 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) 1502 // which is being called when class is unloaded. We delete all the Breakpoint 1503 // information for all versions of method. We may not correctly restore the original 1504 // bytecode in all method versions, but that is ok. Because the class is being unloaded 1505 // so these methods won't be used anymore. 1506 if (bci >= 0) { 1507 break; 1508 } 1509 } else { 1510 // This one is a keeper. 1511 prev_bp = bp; 1512 } 1513 } 1514 } 1515 1516 void methodOopDesc::clear_breakpoint(int bci) { 1517 assert(bci >= 0, ""); 1518 clear_matches(this, bci); 1519 } 1520 1521 void methodOopDesc::clear_all_breakpoints() { 1522 clear_matches(this, -1); 1523 } 1524 1525 1526 int methodOopDesc::invocation_count() { 1527 if (TieredCompilation) { 1528 const methodDataOop mdo = method_data(); 1529 if (invocation_counter()->carry() || ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { 1530 return InvocationCounter::count_limit; 1531 } else { 1532 return invocation_counter()->count() + ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); 1533 } 1534 } else { 1535 return invocation_counter()->count(); 1536 } 1537 } 1538 1539 int methodOopDesc::backedge_count() { 1540 if (TieredCompilation) { 1541 const methodDataOop mdo = method_data(); 1542 if (backedge_counter()->carry() || ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { 1543 return InvocationCounter::count_limit; 1544 } else { 1545 return backedge_counter()->count() + ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); 1546 } 1547 } else { 1548 return backedge_counter()->count(); 1549 } 1550 } 1551 1552 int methodOopDesc::highest_comp_level() const { 1553 methodDataOop mdo = method_data(); 1554 if (mdo != NULL) { 1555 return mdo->highest_comp_level(); 1556 } else { 1557 return CompLevel_none; 1558 } 1559 } 1560 1561 int methodOopDesc::highest_osr_comp_level() const { 1562 methodDataOop mdo = method_data(); 1563 if (mdo != NULL) { 1564 return mdo->highest_osr_comp_level(); 1565 } else { 1566 return CompLevel_none; 1567 } 1568 } 1569 1570 void methodOopDesc::set_highest_comp_level(int level) { 1571 methodDataOop mdo = method_data(); 1572 if (mdo != NULL) { 1573 mdo->set_highest_comp_level(level); 1574 } 1575 } 1576 1577 void methodOopDesc::set_highest_osr_comp_level(int level) { 1578 methodDataOop mdo = method_data(); 1579 if (mdo != NULL) { 1580 mdo->set_highest_osr_comp_level(level); 1581 } 1582 } 1583 1584 BreakpointInfo::BreakpointInfo(methodOop m, int bci) { 1585 _bci = bci; 1586 _name_index = m->name_index(); 1587 _signature_index = m->signature_index(); 1588 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); 1589 if (_orig_bytecode == Bytecodes::_breakpoint) 1590 _orig_bytecode = m->orig_bytecode_at(_bci); 1591 _next = NULL; 1592 } 1593 1594 void BreakpointInfo::set(methodOop method) { 1595 #ifdef ASSERT 1596 { 1597 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); 1598 if (code == Bytecodes::_breakpoint) 1599 code = method->orig_bytecode_at(_bci); 1600 assert(orig_bytecode() == code, "original bytecode must be the same"); 1601 } 1602 #endif 1603 *method->bcp_from(_bci) = Bytecodes::_breakpoint; 1604 method->incr_number_of_breakpoints(); 1605 SystemDictionary::notice_modification(); 1606 { 1607 // Deoptimize all dependents on this method 1608 Thread *thread = Thread::current(); 1609 HandleMark hm(thread); 1610 methodHandle mh(thread, method); 1611 Universe::flush_dependents_on_method(mh); 1612 } 1613 } 1614 1615 void BreakpointInfo::clear(methodOop method) { 1616 *method->bcp_from(_bci) = orig_bytecode(); 1617 assert(method->number_of_breakpoints() > 0, "must not go negative"); 1618 method->decr_number_of_breakpoints(); 1619 }